WO2011108433A1 - Sealing material sheet for solar cell module, and solar cell module - Google Patents
Sealing material sheet for solar cell module, and solar cell module Download PDFInfo
- Publication number
- WO2011108433A1 WO2011108433A1 PCT/JP2011/054110 JP2011054110W WO2011108433A1 WO 2011108433 A1 WO2011108433 A1 WO 2011108433A1 JP 2011054110 W JP2011054110 W JP 2011054110W WO 2011108433 A1 WO2011108433 A1 WO 2011108433A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- sealing material
- solar cell
- cell module
- organic peroxide
- sheet
- Prior art date
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- 239000003566 sealing material Substances 0.000 title claims abstract description 93
- 150000001451 organic peroxides Chemical class 0.000 claims abstract description 56
- 229920001577 copolymer Polymers 0.000 claims abstract description 10
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 claims abstract description 8
- 239000005977 Ethylene Substances 0.000 claims abstract description 8
- 239000008393 encapsulating agent Substances 0.000 claims description 31
- 238000000354 decomposition reaction Methods 0.000 claims description 7
- 238000004132 cross linking Methods 0.000 abstract description 36
- XTXRWKRVRITETP-UHFFFAOYSA-N Vinyl acetate Chemical compound CC(=O)OC=C XTXRWKRVRITETP-UHFFFAOYSA-N 0.000 abstract description 5
- 230000015572 biosynthetic process Effects 0.000 abstract description 3
- 230000003247 decreasing effect Effects 0.000 abstract description 3
- 230000015556 catabolic process Effects 0.000 abstract 1
- 238000006731 degradation reaction Methods 0.000 abstract 1
- 239000010410 layer Substances 0.000 description 32
- 229920005989 resin Polymers 0.000 description 19
- 239000011347 resin Substances 0.000 description 19
- 239000000499 gel Substances 0.000 description 16
- 238000004519 manufacturing process Methods 0.000 description 14
- 238000003860 storage Methods 0.000 description 14
- 239000000463 material Substances 0.000 description 12
- 238000000034 method Methods 0.000 description 12
- 230000000052 comparative effect Effects 0.000 description 10
- 239000006087 Silane Coupling Agent Substances 0.000 description 5
- 238000000465 moulding Methods 0.000 description 5
- -1 polyethylene Polymers 0.000 description 5
- 239000003963 antioxidant agent Substances 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- QUAMTGJKVDWJEQ-UHFFFAOYSA-N octabenzone Chemical compound OC1=CC(OCCCCCCCC)=CC=C1C(=O)C1=CC=CC=C1 QUAMTGJKVDWJEQ-UHFFFAOYSA-N 0.000 description 4
- 239000006096 absorbing agent Substances 0.000 description 3
- 230000003078 antioxidant effect Effects 0.000 description 3
- 230000004888 barrier function Effects 0.000 description 3
- 239000003431 cross linking reagent Substances 0.000 description 3
- 238000001125 extrusion Methods 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 239000004611 light stabiliser Substances 0.000 description 3
- KOMNUTZXSVSERR-UHFFFAOYSA-N 1,3,5-tris(prop-2-enyl)-1,3,5-triazinane-2,4,6-trione Chemical compound C=CCN1C(=O)N(CC=C)C(=O)N(CC=C)C1=O KOMNUTZXSVSERR-UHFFFAOYSA-N 0.000 description 2
- XDLMVUHYZWKMMD-UHFFFAOYSA-N 3-trimethoxysilylpropyl 2-methylprop-2-enoate Chemical compound CO[Si](OC)(OC)CCCOC(=O)C(C)=C XDLMVUHYZWKMMD-UHFFFAOYSA-N 0.000 description 2
- 101100389815 Caenorhabditis elegans eva-1 gene Proteins 0.000 description 2
- 239000000654 additive Substances 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 238000011156 evaluation Methods 0.000 description 2
- SSDSCDGVMJFTEQ-UHFFFAOYSA-N octadecyl 3-(3,5-ditert-butyl-4-hydroxyphenyl)propanoate Chemical compound CCCCCCCCCCCCCCCCCCOC(=O)CCC1=CC(C(C)(C)C)=C(O)C(C(C)(C)C)=C1 SSDSCDGVMJFTEQ-UHFFFAOYSA-N 0.000 description 2
- 229920000139 polyethylene terephthalate Polymers 0.000 description 2
- 239000005020 polyethylene terephthalate Substances 0.000 description 2
- 229920002620 polyvinyl fluoride Polymers 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 239000006097 ultraviolet radiation absorber Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- JXCAHDJDIAQCJO-UHFFFAOYSA-N (1-tert-butylperoxy-2-ethylhexyl) hydrogen carbonate Chemical compound CCCCC(CC)C(OC(O)=O)OOC(C)(C)C JXCAHDJDIAQCJO-UHFFFAOYSA-N 0.000 description 1
- NALFRYPTRXKZPN-UHFFFAOYSA-N 1,1-bis(tert-butylperoxy)-3,3,5-trimethylcyclohexane Chemical compound CC1CC(C)(C)CC(OOC(C)(C)C)(OOC(C)(C)C)C1 NALFRYPTRXKZPN-UHFFFAOYSA-N 0.000 description 1
- BJELTSYBAHKXRW-UHFFFAOYSA-N 2,4,6-triallyloxy-1,3,5-triazine Chemical compound C=CCOC1=NC(OCC=C)=NC(OCC=C)=N1 BJELTSYBAHKXRW-UHFFFAOYSA-N 0.000 description 1
- ZXDDPOHVAMWLBH-UHFFFAOYSA-N 2,4-Dihydroxybenzophenone Chemical compound OC1=CC(O)=CC=C1C(=O)C1=CC=CC=C1 ZXDDPOHVAMWLBH-UHFFFAOYSA-N 0.000 description 1
- DMWVYCCGCQPJEA-UHFFFAOYSA-N 2,5-bis(tert-butylperoxy)-2,5-dimethylhexane Chemical compound CC(C)(C)OOC(C)(C)CCC(C)(C)OOC(C)(C)C DMWVYCCGCQPJEA-UHFFFAOYSA-N 0.000 description 1
- LEVFXWNQQSSNAC-UHFFFAOYSA-N 2-(4,6-diphenyl-1,3,5-triazin-2-yl)-5-hexoxyphenol Chemical compound OC1=CC(OCCCCCC)=CC=C1C1=NC(C=2C=CC=CC=2)=NC(C=2C=CC=CC=2)=N1 LEVFXWNQQSSNAC-UHFFFAOYSA-N 0.000 description 1
- WPMYUUITDBHVQZ-UHFFFAOYSA-M 3-(3,5-ditert-butyl-4-hydroxyphenyl)propanoate Chemical compound CC(C)(C)C1=CC(CCC([O-])=O)=CC(C(C)(C)C)=C1O WPMYUUITDBHVQZ-UHFFFAOYSA-M 0.000 description 1
- QRLSTWVLSWCGBT-UHFFFAOYSA-N 4-((4,6-bis(octylthio)-1,3,5-triazin-2-yl)amino)-2,6-di-tert-butylphenol Chemical compound CCCCCCCCSC1=NC(SCCCCCCCC)=NC(NC=2C=C(C(O)=C(C=2)C(C)(C)C)C(C)(C)C)=N1 QRLSTWVLSWCGBT-UHFFFAOYSA-N 0.000 description 1
- ZVVFVKJZNVSANF-UHFFFAOYSA-N 6-[3-(3,5-ditert-butyl-4-hydroxyphenyl)propanoyloxy]hexyl 3-(3,5-ditert-butyl-4-hydroxyphenyl)propanoate Chemical compound CC(C)(C)C1=C(O)C(C(C)(C)C)=CC(CCC(=O)OCCCCCCOC(=O)CCC=2C=C(C(O)=C(C=2)C(C)(C)C)C(C)(C)C)=C1 ZVVFVKJZNVSANF-UHFFFAOYSA-N 0.000 description 1
- 239000004641 Diallyl-phthalate Substances 0.000 description 1
- CTQNGGLPUBDAKN-UHFFFAOYSA-N O-Xylene Chemical compound CC1=CC=CC=C1C CTQNGGLPUBDAKN-UHFFFAOYSA-N 0.000 description 1
- JKIJEFPNVSHHEI-UHFFFAOYSA-N Phenol, 2,4-bis(1,1-dimethylethyl)-, phosphite (3:1) Chemical compound CC(C)(C)C1=CC(C(C)(C)C)=CC=C1OP(OC=1C(=CC(=CC=1)C(C)(C)C)C(C)(C)C)OC1=CC=C(C(C)(C)C)C=C1C(C)(C)C JKIJEFPNVSHHEI-UHFFFAOYSA-N 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- 239000004743 Polypropylene Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- XITRBUPOXXBIJN-UHFFFAOYSA-N bis(2,2,6,6-tetramethylpiperidin-4-yl) decanedioate Chemical compound C1C(C)(C)NC(C)(C)CC1OC(=O)CCCCCCCCC(=O)OC1CC(C)(C)NC(C)(C)C1 XITRBUPOXXBIJN-UHFFFAOYSA-N 0.000 description 1
- QUDWYFHPNIMBFC-UHFFFAOYSA-N bis(prop-2-enyl) benzene-1,2-dicarboxylate Chemical compound C=CCOC(=O)C1=CC=CC=C1C(=O)OCC=C QUDWYFHPNIMBFC-UHFFFAOYSA-N 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000012790 confirmation Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000007334 copolymerization reaction Methods 0.000 description 1
- 229910021419 crystalline silicon Inorganic materials 0.000 description 1
- MCPKSFINULVDNX-UHFFFAOYSA-N drometrizole Chemical compound CC1=CC=C(O)C(N2N=C3C=CC=CC3=N2)=C1 MCPKSFINULVDNX-UHFFFAOYSA-N 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000004049 embossing Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- FWDBOZPQNFPOLF-UHFFFAOYSA-N ethenyl(triethoxy)silane Chemical compound CCO[Si](OCC)(OCC)C=C FWDBOZPQNFPOLF-UHFFFAOYSA-N 0.000 description 1
- NKSJNEHGWDZZQF-UHFFFAOYSA-N ethenyl(trimethoxy)silane Chemical compound CO[Si](OC)(OC)C=C NKSJNEHGWDZZQF-UHFFFAOYSA-N 0.000 description 1
- 229920006242 ethylene acrylic acid copolymer Polymers 0.000 description 1
- 229920005648 ethylene methacrylic acid copolymer Polymers 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 229920000554 ionomer Polymers 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 239000004417 polycarbonate Substances 0.000 description 1
- 229920000515 polycarbonate Polymers 0.000 description 1
- 229910021420 polycrystalline silicon Inorganic materials 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 229920000098 polyolefin Polymers 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 229920000915 polyvinyl chloride Polymers 0.000 description 1
- 239000004800 polyvinyl chloride Substances 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 239000000565 sealant Substances 0.000 description 1
- 239000002356 single layer Substances 0.000 description 1
- 239000003381 stabilizer Substances 0.000 description 1
- 125000000999 tert-butyl group Chemical group [H]C([H])([H])C(*)(C([H])([H])[H])C([H])([H])[H] 0.000 description 1
- 238000005979 thermal decomposition reaction Methods 0.000 description 1
- DOEHJNBEOVLHGL-UHFFFAOYSA-N trichloro(propyl)silane Chemical compound CCC[Si](Cl)(Cl)Cl DOEHJNBEOVLHGL-UHFFFAOYSA-N 0.000 description 1
- JCVQKRGIASEUKR-UHFFFAOYSA-N triethoxy(phenyl)silane Chemical compound CCO[Si](OCC)(OCC)C1=CC=CC=C1 JCVQKRGIASEUKR-UHFFFAOYSA-N 0.000 description 1
- TUQLLQQWSNWKCF-UHFFFAOYSA-N trimethoxymethylsilane Chemical compound COC([SiH3])(OC)OC TUQLLQQWSNWKCF-UHFFFAOYSA-N 0.000 description 1
- 239000008096 xylene Substances 0.000 description 1
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
- C08J5/18—Manufacture of films or sheets
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L31/00—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L31/04—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof adapted as photovoltaic [PV] conversion devices
- H01L31/042—PV modules or arrays of single PV cells
- H01L31/048—Encapsulation of modules
- H01L31/0481—Encapsulation of modules characterised by the composition of the encapsulation material
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2323/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
- C08J2323/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
- C08J2323/04—Homopolymers or copolymers of ethene
- C08J2323/08—Copolymers of ethene
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
Definitions
- the present invention relates to a solar cell module sealing material sheet and a solar cell module.
- solar cells have attracted attention as a clean power generation technology that uses sunlight.
- a module in which solar cells are embedded and sealed in a sealing material layer, and both sides of the sealing material layer are protected by a surface protection member and a back surface protection member is known.
- a surface protection member, a sealing material sheet, a solar battery cell, a sealing material sheet and a back surface protection member were laminated in this order, and these were heated and deaerated in a vacuum. Later, a method is widely used in which heating is performed while applying a load of 1 atm in a vacuum so that the sealing resin is crosslinked and cured while embedding the solar battery cells and bonded and integrated.
- EVA ethylene / vinyl acetate copolymer
- a sealing material sheet for a solar cell one having a single layer structure is the most common, and at least an organic peroxide is added as a crosslinking agent (for example, Patent Documents 1 to 5).
- the organic peroxide By containing the organic peroxide, the organic peroxide is decomposed by heat to generate radicals, and EVA is crosslinked.
- a photovoltaic cell can be fixed in the sealing material layer of a solar cell module by bridge
- the encapsulant sheet often contains additives such as a crosslinking aid, a silane coupling agent, a light stabilizer, and an ultraviolet absorber at a certain ratio for the purpose of improving the durability.
- a manufacturing method of a sealing material sheet for example, a T-die method in which a resin forming a sealing material sheet is extruded in a molten state from a die having a linear slit, and rapidly cooled and solidified in a cooling roll or a water tank, or a calendar method is used.
- a film forming process is employed.
- a sealing material sheet having a thickness of about 500 ⁇ m is formed by the film forming step.
- corrugation to the sealing material sheet surface may be given in the said film forming process.
- Japanese Patent Laid-Open No. 9-27633 Japanese Patent Laid-Open No. 11-54768 JP 2000-183381 A JP 2005-126708 A JP 2006-186233 A
- the present invention can be molded without generating a gel, can form a sealing material layer with a high crosslinking rate even after use after transportation or storage for a certain period of time, and a high-quality solar cell module excellent in durability. It aims at provision of the sealing material sheet for solar cell modules which can be manufactured stably. Moreover, this invention aims at provision of the high quality solar cell module which has the outstanding durability using the said sealing material sheet for solar cell modules.
- a sealing material sheet for a solar cell module wherein the content of the organic peroxide is 0.4 to 1.0 part by mass with respect to 100 parts by mass of the ethylene / vinyl acetate copolymer.
- A The amount of volatilization when 0.15 g of organic peroxide is stored at 50 ° C. for 5 hours in a cylindrical container having a bottom with a radius of 1.8 cm and a depth of 0.9 cm is 15 It is below mass%.
- the decomposition temperature at which the organic peroxide is halved in 1 hour is 115 to 140 ° C.
- a solar battery cell, a sealing material layer that seals the solar battery cell, a surface protection member that protects the front surface side of the sealing material layer, and a back surface that protects the back surface side of the sealing material layer A solar cell module, wherein the sealing material layer is formed by the solar cell module sealing material sheet according to [1].
- the solar cell module encapsulant sheet of the present invention can be formed without generating gel, and can be used after transportation or after storage for a certain period of time to form an encapsulant layer with a high crosslinking rate, which is durable.
- An excellent high quality solar cell module can be manufactured stably.
- the solar cell module of the present invention uses the encapsulant sheet for solar cell modules of the present invention, an excellent encapsulant layer having a high crosslinking rate is stably formed, and the durability is improved. Excellent high quality.
- the solar cell module sealing material sheet of the present invention (hereinafter simply referred to as “sealing material sheet”) is a sheet used for forming a sealing material layer for sealing solar cells in a solar cell module, Contains an ethylene / vinyl acetate copolymer (EVA) and an organic peroxide.
- EVA ethylene / vinyl acetate copolymer
- EVA is used as a main component for the resin base material which forms the sealing material sheet of this invention.
- EVA is advantageous in that it has high transparency, is inexpensive, and has a particularly large past record of use.
- “Eva as a main component” means that EVA is 95% by mass or more based on the total amount of the resin base material.
- the sealing material sheet of the present invention may contain other resins in addition to EVA. Examples of other resins include polyolefins such as polyethylene and polypropylene; ionomers; ethylene-methacrylic acid copolymers; ethylene-acrylic acid copolymers; polyvinyl fluoride; polyvinyl chloride or copolymers thereof. 95 mass% or more is preferable, as for the ratio of EVA in the resin base material of the sealing material sheet of this invention, 97 mass% or more is more preferable, and 100 mass% is especially preferable.
- the MFR (melt flow rate) of the resin base material is preferably 20 to 40 g / 10 minutes. If MFR of a resin base material is a copolymer, it can be adjusted by adjusting the content rate of the unit derived from a copolymerization component.
- the MFR of EVA can be adjusted by adjusting the content of vinyl acetate units in 100% by mass of EVA.
- the content of vinyl acetate units in 100% by mass of all units of EVA is preferably 20 to 40% by mass, and more preferably 25 to 35% by mass.
- the MFR can also be adjusted by adjusting the molecular weight, and the MFR is decreased by increasing the molecular weight.
- the MFR is measured by a method based on ASTM D1238.
- the sealing material sheet of the present invention contains an organic peroxide that satisfies the following conditions (A) and (B) as a crosslinking agent (hereinafter referred to as “organic peroxide I”).
- organic peroxide I a crosslinking agent
- A The amount of volatilization when 0.15 g of organic peroxide is stored at 50 ° C. for 5 hours in a cylindrical container having a bottom with a radius of 1.8 cm and a depth of 0.9 cm is 15 It is below mass%.
- the decomposition temperature at which the organic peroxide is halved in 1 hour is 115 to 140 ° C.
- the crosslinking rate of the sealing material layer decreases, and the resulting solar cell module Durability may be significantly reduced.
- the organic peroxide contained in the encapsulant sheet is volatilized in the encapsulant sheet after transportation or after being stored for a certain period of time. , It turned out that the amount has decreased. Therefore, the present inventors suppress the organic peroxide from volatilizing from the encapsulant sheet by using the organic peroxide I that satisfies the condition (A), and after transportation or for a certain period of time. It has been found that a high-quality solar cell module can be stably produced even if the encapsulant sheet after storage is used.
- the organic peroxide I has a decomposition temperature of 115 to 140 ° C., which is halved in 1 hour. If the decomposition temperature of the organic peroxide I is 115 ° C. or higher, it is possible to suppress the occurrence of gel in the encapsulant sheet due to the progress of the crosslinking reaction during sheet molding. Further, if the decomposition temperature of the organic peroxide I is 140 ° C. or lower, the crosslinking reaction proceeds sufficiently during the production of the solar cell module, and the crosslinking material has a high crosslinking rate, so that it has excellent durability. A solar cell module having the property can be obtained.
- organic peroxide I t-butylperoxy-2-ethylhexyl monocarbonate (the volatilization amount of the condition (A): 7.2% by mass, the thermal decomposition temperature of the condition (B): 119 ° C.) is preferable.
- the organic peroxide I contained in the sealing material sheet of the present invention is preferably one type.
- each type of organic peroxide I in the encapsulant sheet after a certain period of time The ratio may change and become non-uniform.
- a solar cell is sandwiched between two encapsulant sheets, heated while applying a load in a vacuum, and encapsulating the solar cell while embedding the solar cell
- the organic peroxide I contained in each of the two sealing material sheets is preferably the same. If encapsulant sheets containing the same organic peroxide I are used, the amount of organic peroxide I between the two encapsulant sheets is almost the same even after a certain period of time. Since it is easy to suppress uniformization, it is easy to reduce the variation in the characteristics of the solar cell module.
- the content of the organic peroxide I in the sealing material sheet of the present invention is 0.4 to 1.0 part by mass, preferably 0.5 to 0.8 part by mass with respect to 100 parts by mass of EVA. If content of the organic peroxide I is 0.4 mass part or more with respect to 100 mass parts of EVA, a sealing material layer with a high crosslinking rate can be formed, and the solar cell module excellent in durability can be manufactured. If content of the organic peroxide I is 1.0 mass part or less with respect to 100 mass parts of EVA, it can suppress that a crosslinking reaction advances at the time of sheet
- the sealing material sheet of the present invention may contain a crosslinking aid for promoting the crosslinking reaction in addition to the organic peroxide.
- a crosslinking aid for promoting the crosslinking reaction in addition to the organic peroxide.
- the crosslinking aid include triallyl isocyanurate, diallyl phthalate, triallyl cyanurate and the like.
- the sealing material sheet of the present invention may contain a silane coupling agent in order to improve the adhesion between the sealing material layer, the surface protection member, and the back surface protection member.
- a silane coupling agent examples include ⁇ -methacryloxypropyltrimethoxysilane, limethoxypropylsilane, trimethoxymethylsilane, vinyltrimethoxysilane, vinyltriethoxysilane, trichloropropylsilane, triethoxyphenylsilane, and the like.
- the sealing material sheet of this invention may contain stabilizers, such as a ultraviolet absorber and antioxidant.
- stabilizers such as a ultraviolet absorber and antioxidant.
- ultraviolet absorbers used for improving light resistance include 2- (5-methyl-2-hydroxyphenyl) benzotriazole and 2- (3-t-butyl-5-methyl-2-hydroxyphenyl) -5.
- Antioxidants used for improving thermal stability include 1,6-hexanediol-bis [3- (3,5-di-t-butyl-4-hydroxyphenyl) propionate], pentaerythrityl- Tetrakis [3- (3,5-di-tert-butyl-4-hydroxyphenyl) propionate], tris (2,4-di-tert-butylphenyl) phosphite, 2,4-bis- (n-octylthio) -6- (4-hydroxy-3,5-di-t-butylanilino) -1,3,5-triazine, octadecyl-3- (3,5-di-t-butyl-4-hydroxyphenyl) propionate Can be mentioned.
- the encapsulant sheet of the present invention can be produced by a known production method except that the organic peroxide I described above is used as a crosslinking agent.
- a sealing material sheet is manufactured by a co-extrusion method in which a resin obtained by mixing an organic peroxide and an additive that is added as necessary to the resin base material and heat-melting the resin is extruded using a T die or the like.
- membrane is mentioned.
- the surface of the heat-melted resin sheet is brought into close contact with a roll (made of metal or rubber) on which a concavo-convex pattern is applied.
- the uneven pattern of the roll may be transferred to both sides, and the encapsulant sheet may be embossed.
- the generation of gel during sheet forming is suppressed. Further, it is possible to prevent the organic peroxide in the sheet from volatilizing and reducing its amount after transportation or after storage for a certain period. Therefore, if it is a sealing material sheet of the present invention, even if it is a sealing material sheet after a certain period of time, a high quality that stably forms a sealing material layer having a high crosslinking rate and has excellent durability A stable solar cell module can be manufactured.
- the solar battery module of the present invention includes a solar battery cell, a sealing material layer that seals the solar battery cell, a surface protection member that protects the surface side of the sealing material layer, and a back surface of the sealing material layer.
- the solar cell module 1 of the present embodiment includes solar cells 4 and 4, a sealing material layer 3 that seals the solar cells 4 and 4, and a surface side of the sealing material layer 3. And a back surface protection member 5 for protecting the back surface side of the sealing material layer 3.
- the solar battery cell 4 is a cell having a function of converting light incident on the light receiving surface into electricity by a photoelectric effect.
- a plurality (two in FIG. 1) of solar cells 4 are connected by electrodes (not shown) in the solar cell module 1.
- the number of solar cells 4 is not particularly limited. Examples of the material of the solar battery cell 4 include crystalline silicon. Among these, polycrystalline silicon is particularly preferable from the viewpoint of manufacturing simplicity and cost.
- the sealing material layer 3 is a layer that embeds and seals the solar cells 4 and 4 and is formed of the sealing material sheet of the present invention.
- the thickness of the sealing material layer 3 is preferably 0.3 to 0.6 mm.
- the surface protective material 2 As the surface protective material 2, those excellent in durability, weather resistance, and transparency are preferable, and examples thereof include a glass sheet, a resin sheet such as polyethylene terephthalate, and the like. Moreover, you may use resin sheets, such as a polycarbonate.
- the thickness of the surface protection member 2 is preferably 3 to 6 mm.
- back protection member 5 As the back surface protection member 5, those excellent in durability and weather resistance are preferable, and examples thereof include resin sheets such as polyethylene terephthalate, polyvinyl fluoride, EVA, and laminates thereof. Moreover, you may laminate
- the thickness of the back surface protection member 5 is preferably 0.2 to 0.4 mm.
- the manufacturing method of the said solar cell module 1 is demonstrated as an example of the manufacturing method of the solar cell module of this invention.
- the manufacturing method of the solar cell module of the present invention is not limited to the following method.
- the back surface protection member 2, the sealing material sheet 3A, the solar battery cells 4, 4, the sealing material sheet 3B, and the surface protection member 5 are laminated in this order to form a laminated body 1A.
- the laminated body 1A is vacuum-laminated by heating and pressurizing in a vacuum state, the solar battery cells 4 and 4 are embedded in the sealing material sheets 3A and 3B, and the transparent resin base material (EVA) of the sealing material sheets 3A and 3B is obtained.
- EVA transparent resin base material
- the sealing material sheet 3A and the sealing material sheet 3B are the sealing material sheets of the present invention, may be the same composition sealing material sheet, may be different composition sealing material sheet, but uniform It is preferable that the sealing material sheet has the same composition from the viewpoint that a good quality module is easily obtained by forming a crosslinked structure.
- the encapsulant layer Since the solar cell module described above uses the encapsulant sheet of the present invention, the encapsulant layer has a crosslinking rate even after the encapsulant sheet is transported or stored for a certain period of time. High, excellent durability and high quality.
- the volatilization amount (unit: mass%) of the organic peroxide used in this example was 0.15 g of the organic peroxide in a cylindrical container having a bottom radius of 1.8 cm and a depth of 0.9 cm. The sample was put in, stored at 50 ° C. for 5 hours, and calculated from the mass before and after storage.
- EVA-1 EVA having a vinyl acetate unit content of 30% by mass and an MFR of 30 g / 10 min
- Example 1 With respect to 100 parts by mass of EVA-1, 0.7 parts by mass of organic peroxide I-1, 0.5 parts by mass of crosslinking assistant III-1, and 0.5 parts by mass of silane coupling agent IV-1 Part, 0.1 part by weight of the UV absorber V-1, 0.1 part by weight of the antioxidant VI-1, and 0.2 part by weight of the light stabilizer VII-1. Subsequently, the composition was sheet-formed by an extrusion method at a molding temperature of 110 ° C. so as to have a thickness of 0.40 to 0.50 mm using an extrusion molding machine. The thickness of the obtained sealing material sheet was measured with an electronic micrometer (K351C manufactured by Anritsu).
- Example 2 to 3 A sealing material sheet was produced in the same manner as in Example 1 except that the amount of the organic peroxide I-1 was changed as shown in Table 1.
- the sealing material sheets obtained in the examples and comparative examples were placed in a mesh-shaped storage box in a constant temperature and humidity chamber at a temperature of 40 ° C. and a humidity of 20% RH without overlapping with other sheets. Stored for hours. Thereafter, the encapsulant sheet was taken out, allowed to stand for 6 hours in an environment of normal temperature and humidity, and then the crosslinking rate was measured by the same method as described in the initial crosslinking rate. Those with a crosslinking rate of 80% or more were marked with “ ⁇ ”, and those with less than 80% were marked with “x”.
- the organic peroxide I satisfying the condition (A) and the condition (B) was used in the range of 0.4 to 1.0 part by mass with respect to 100 parts by mass of EVA.
- the encapsulant sheet 3 had a high initial crosslinking rate and excellent storage stability.
- the sealing material sheet was of high quality without generating gel during molding.
- the sealing material sheet of Comparative Example 1 using an organic peroxide having a decomposition temperature of less than 115 ° C. under the condition (B) was inferior in quality because gel was generated during sheet molding.
- the sealing material sheet of Comparative Example 2 using an organic peroxide having a volatilization amount of more than 15% by mass under the condition (A) has a high initial crosslinking rate, the crosslinking rate after storage is greatly reduced and stored. Stability was low.
- the organic peroxide I satisfying the conditions (A) and (B) is used, the encapsulant sheet of Comparative Example 3 whose content is less than 0.4 parts by mass with respect to 100 parts by mass of EVA, The crosslinking rate was already as low as 80% or less in the initial state before storage.
- the encapsulant sheet had an initial crosslinking rate of less than 80% by mass, and thus the crosslinking rate after storage was less than 80% by mass regardless of storage stability.
- the organic peroxide I satisfying the conditions (A) and (B) is used, the encapsulant sheet of Comparative Example 4 whose content exceeds 1.0 part by mass with respect to 100 parts by mass of EVA is a sheet. Gel was generated during molding and the quality was poor.
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Abstract
Disclosed are: a sealing material sheet for a solar cell module, which can be formed without the occurrence of formation of a gel, and enables the formation of a sealing material layer having a high cross-linking rate even when used after the elapse of a certain period; and a solar cell module which is produced using the sealing material sheet and has excellent durability.
Specifically disclosed are: a sealing material sheet for a solar cell module, which comprises an ethylene/(vinyl acetate) copolymer and an organic peroxide, wherein the organic peroxide has a volatilization ratio of 15 mass% or less under specific conditions and has a degradation temperature at which the amount thereof is decreased by half after an hour of 115 to 140°C, and wherein the content of the organic peroxide is 0.4 to 1.0 part by mass relative to 100 parts by mass of the ethylene/(vinyl acetate) copolymer; and a solar cell module produced using the sealing material sheet.
Description
本発明は、太陽電池モジュール用封止材シートおよび太陽電池モジュールに関する。
The present invention relates to a solar cell module sealing material sheet and a solar cell module.
近年、太陽光を利用するクリーンな発電技術として、太陽電池が注目を集めている。一般的な太陽電池モジュールとしては、太陽電池セルを封止材層内に包埋させて封止し、該封止材層の両面側を表面保護部材と裏面保護部材で保護したモジュールが知られている。該太陽電池モジュールの製造方法としては、表面保護部材、封止材シート、太陽電池セル、封止材シート及び裏面保護部材をこの順序で積層し、これらを真空中で加熱して脱気させた後に、真空中で１気圧の荷重をかけながら加熱して、太陽電池セルを包埋させつつ封止材樹脂を架橋硬化させて接着一体化する方法が広く用いられている。
In recent years, solar cells have attracted attention as a clean power generation technology that uses sunlight. As a general solar cell module, a module in which solar cells are embedded and sealed in a sealing material layer, and both sides of the sealing material layer are protected by a surface protection member and a back surface protection member is known. ing. As a manufacturing method of this solar cell module, a surface protection member, a sealing material sheet, a solar battery cell, a sealing material sheet and a back surface protection member were laminated in this order, and these were heated and deaerated in a vacuum. Later, a method is widely used in which heating is performed while applying a load of 1 atm in a vacuum so that the sealing resin is crosslinked and cured while embedding the solar battery cells and bonded and integrated.
封止材シートの材料としては、一般的に、主成分となる樹脂としてＥＶＡ（エチレン／酢酸ビニル共重合体）が使用される。太陽電池用の封止材シートとしては、単層構成のものが最も一般的であり、少なくとも架橋剤として有機過酸化物が添加される（例えば、特許文献１～５）。有機過酸化物を含有させることで、熱によって有機過酸化物が分解してラジカルが発生し、ＥＶＡが架橋される。このように、有機過酸化物によってＥＶＡを架橋することにより、太陽電池モジュールの封止材層中に太陽電池セルを固定できる。また、封止材シートには、その耐久性を向上させる目的で、架橋助剤、シランカップリング剤、光安定剤、紫外線吸収剤といった添加物が一定割合で含有されることが多い。
As a material for the encapsulant sheet, EVA (ethylene / vinyl acetate copolymer) is generally used as a main resin. As a sealing material sheet for a solar cell, one having a single layer structure is the most common, and at least an organic peroxide is added as a crosslinking agent (for example, Patent Documents 1 to 5). By containing the organic peroxide, the organic peroxide is decomposed by heat to generate radicals, and EVA is crosslinked. Thus, a photovoltaic cell can be fixed in the sealing material layer of a solar cell module by bridge | crosslinking EVA by an organic peroxide. In addition, the encapsulant sheet often contains additives such as a crosslinking aid, a silane coupling agent, a light stabilizer, and an ultraviolet absorber at a certain ratio for the purpose of improving the durability.
封止材シートの製造方法としては、例えば、直線状スリットを有するダイから封止材シートを形成する樹脂を溶融状態で押し出し、冷却ロールもしくは水槽で急冷固化するＴダイ法、又はカレンダー法等の製膜工程が採用される。前記製膜工程により５００μｍ程度の厚みの封止材シートが成膜される。また、前記製膜工程の中で、封止材シート表面に凹凸を付与するエンボス加工が施されることもある。
As a manufacturing method of a sealing material sheet, for example, a T-die method in which a resin forming a sealing material sheet is extruded in a molten state from a die having a linear slit, and rapidly cooled and solidified in a cooling roll or a water tank, or a calendar method is used. A film forming process is employed. A sealing material sheet having a thickness of about 500 μm is formed by the film forming step. Moreover, the embossing which provides an unevenness | corrugation to the sealing material sheet surface may be given in the said film forming process.
しかしながら、特許文献１～５に記載されているような従来の封止材シートは、輸送後や一定期間の保管後に使用すると、太陽電池モジュールにおける封止材層の架橋率が低下し、太陽電池モジュールの耐久性が著しく低下することがある。
また、封止材シートの製造においては、条件によってはシート中にゲルが発生することがあるため、シート成形時のゲルの発生を防止することが重要である。 However, when the conventional encapsulant sheet as described in Patent Documents 1 to 5 is used after transportation or after storage for a certain period, the crosslinking rate of the encapsulant layer in the solar cell module decreases, and the solar cell Module durability can be significantly reduced.
Moreover, in manufacture of a sealing material sheet | seat, since gel may generate | occur | produce in a sheet | seat depending on conditions, it is important to prevent generation | occurrence | production of the gel at the time of sheet forming.
また、封止材シートの製造においては、条件によってはシート中にゲルが発生することがあるため、シート成形時のゲルの発生を防止することが重要である。 However, when the conventional encapsulant sheet as described in Patent Documents 1 to 5 is used after transportation or after storage for a certain period, the crosslinking rate of the encapsulant layer in the solar cell module decreases, and the solar cell Module durability can be significantly reduced.
Moreover, in manufacture of a sealing material sheet | seat, since gel may generate | occur | produce in a sheet | seat depending on conditions, it is important to prevent generation | occurrence | production of the gel at the time of sheet forming.
本発明は、ゲルを発生させることなく成形でき、輸送後や一定期間の保管後に使用しても、高い架橋率の封止材層が形成でき、耐久性に優れた高品質な太陽電池モジュールを安定して製造できる太陽電池モジュール用封止材シートの提供を目的とする。また、本発明は、前記太陽電池モジュール用封止材シートを用いた、優れた耐久性を有する高品質な太陽電池モジュールの提供を目的とする。
The present invention can be molded without generating a gel, can form a sealing material layer with a high crosslinking rate even after use after transportation or storage for a certain period of time, and a high-quality solar cell module excellent in durability. It aims at provision of the sealing material sheet for solar cell modules which can be manufactured stably. Moreover, this invention aims at provision of the high quality solar cell module which has the outstanding durability using the said sealing material sheet for solar cell modules.
本発明は、前記課題を解決するために以下の構成を採用した。
［１］エチレン／酢酸ビニル共重合体と有機過酸化物とを含有する太陽電池モジュール用封止材シートであって、前記有機過酸化物が下記条件（Ａ）及び条件（Ｂ）を満たし、かつ該有機過酸化物の含有量が前記エチレン／酢酸ビニル共重合体１００質量部に対して０．４～１．０質量部である太陽電池モジュール用封止材シート。
（Ａ）半径が１．８ｃｍの底面を有し、深さが０．９ｃｍの円筒容器内で、０．１５ｇの有機過酸化物を５０℃の条件で５時間保管したときの揮発量が１５質量％以下である。
（Ｂ）有機過酸化物が１時間で半減する分解温度が１１５～１４０℃である。
［２］太陽電池セルと、前記太陽電池セルを封止する封止材層と、前記封止材層の表面側を保護する表面保護部材と、前記封止材層の裏面側を保護する裏面保護部材と、を有し、前記封止材層が、前記［１］に記載の太陽電池モジュール用封止材シートにより形成されている太陽電池モジュール。 The present invention employs the following configuration in order to solve the above problems.
[1] A solar cell module encapsulant sheet containing an ethylene / vinyl acetate copolymer and an organic peroxide, wherein the organic peroxide satisfies the following conditions (A) and (B): A sealing material sheet for a solar cell module, wherein the content of the organic peroxide is 0.4 to 1.0 part by mass with respect to 100 parts by mass of the ethylene / vinyl acetate copolymer.
(A) The amount of volatilization when 0.15 g of organic peroxide is stored at 50 ° C. for 5 hours in a cylindrical container having a bottom with a radius of 1.8 cm and a depth of 0.9 cm is 15 It is below mass%.
(B) The decomposition temperature at which the organic peroxide is halved in 1 hour is 115 to 140 ° C.
[2] A solar battery cell, a sealing material layer that seals the solar battery cell, a surface protection member that protects the front surface side of the sealing material layer, and a back surface that protects the back surface side of the sealing material layer A solar cell module, wherein the sealing material layer is formed by the solar cell module sealing material sheet according to [1].
［１］エチレン／酢酸ビニル共重合体と有機過酸化物とを含有する太陽電池モジュール用封止材シートであって、前記有機過酸化物が下記条件（Ａ）及び条件（Ｂ）を満たし、かつ該有機過酸化物の含有量が前記エチレン／酢酸ビニル共重合体１００質量部に対して０．４～１．０質量部である太陽電池モジュール用封止材シート。
（Ａ）半径が１．８ｃｍの底面を有し、深さが０．９ｃｍの円筒容器内で、０．１５ｇの有機過酸化物を５０℃の条件で５時間保管したときの揮発量が１５質量％以下である。
（Ｂ）有機過酸化物が１時間で半減する分解温度が１１５～１４０℃である。
［２］太陽電池セルと、前記太陽電池セルを封止する封止材層と、前記封止材層の表面側を保護する表面保護部材と、前記封止材層の裏面側を保護する裏面保護部材と、を有し、前記封止材層が、前記［１］に記載の太陽電池モジュール用封止材シートにより形成されている太陽電池モジュール。 The present invention employs the following configuration in order to solve the above problems.
[1] A solar cell module encapsulant sheet containing an ethylene / vinyl acetate copolymer and an organic peroxide, wherein the organic peroxide satisfies the following conditions (A) and (B): A sealing material sheet for a solar cell module, wherein the content of the organic peroxide is 0.4 to 1.0 part by mass with respect to 100 parts by mass of the ethylene / vinyl acetate copolymer.
(A) The amount of volatilization when 0.15 g of organic peroxide is stored at 50 ° C. for 5 hours in a cylindrical container having a bottom with a radius of 1.8 cm and a depth of 0.9 cm is 15 It is below mass%.
(B) The decomposition temperature at which the organic peroxide is halved in 1 hour is 115 to 140 ° C.
[2] A solar battery cell, a sealing material layer that seals the solar battery cell, a surface protection member that protects the front surface side of the sealing material layer, and a back surface that protects the back surface side of the sealing material layer A solar cell module, wherein the sealing material layer is formed by the solar cell module sealing material sheet according to [1].
本発明の太陽電池モジュール用封止材シートは、ゲルを発生させることなく成形でき、輸送後や一定期間の保管後に使用しても、高い架橋率の封止材層が形成でき、耐久性に優れた高品質な太陽電池モジュールを安定して製造できる。
また、本発明の太陽電池モジュールは、本発明の太陽電池モジュール用封止材シートを用いているため、高い架橋率を有する優れた封止材層が安定して形成されており、耐久性に優れ高品質である。 The solar cell module encapsulant sheet of the present invention can be formed without generating gel, and can be used after transportation or after storage for a certain period of time to form an encapsulant layer with a high crosslinking rate, which is durable. An excellent high quality solar cell module can be manufactured stably.
Moreover, since the solar cell module of the present invention uses the encapsulant sheet for solar cell modules of the present invention, an excellent encapsulant layer having a high crosslinking rate is stably formed, and the durability is improved. Excellent high quality.
また、本発明の太陽電池モジュールは、本発明の太陽電池モジュール用封止材シートを用いているため、高い架橋率を有する優れた封止材層が安定して形成されており、耐久性に優れ高品質である。 The solar cell module encapsulant sheet of the present invention can be formed without generating gel, and can be used after transportation or after storage for a certain period of time to form an encapsulant layer with a high crosslinking rate, which is durable. An excellent high quality solar cell module can be manufactured stably.
Moreover, since the solar cell module of the present invention uses the encapsulant sheet for solar cell modules of the present invention, an excellent encapsulant layer having a high crosslinking rate is stably formed, and the durability is improved. Excellent high quality.
＜太陽電池モジュール用封止材シート＞
本発明の太陽電池モジュール用封止材シート（以下、単に「封止材シート」という。）は、太陽電池モジュールにおいて太陽電池セルを封止する封止材層の形成に用いるシートであって、エチレン／酢酸ビニル共重合体（ＥＶＡ）と有機過酸化物とを含有する。 <Sealant sheet for solar cell module>
The solar cell module sealing material sheet of the present invention (hereinafter simply referred to as “sealing material sheet”) is a sheet used for forming a sealing material layer for sealing solar cells in a solar cell module, Contains an ethylene / vinyl acetate copolymer (EVA) and an organic peroxide.
本発明の太陽電池モジュール用封止材シート（以下、単に「封止材シート」という。）は、太陽電池モジュールにおいて太陽電池セルを封止する封止材層の形成に用いるシートであって、エチレン／酢酸ビニル共重合体（ＥＶＡ）と有機過酸化物とを含有する。 <Sealant sheet for solar cell module>
The solar cell module sealing material sheet of the present invention (hereinafter simply referred to as “sealing material sheet”) is a sheet used for forming a sealing material layer for sealing solar cells in a solar cell module, Contains an ethylene / vinyl acetate copolymer (EVA) and an organic peroxide.
本発明の封止材シートを形成する樹脂基材は、主成分としてＥＶＡを使用することが好ましい。ＥＶＡは、高い透明性を有し、安価であり、特に過去の使用実績が膨大である点で有利である。ＥＶＡを主成分とするとは、樹脂基材の総量に対して、ＥＶＡを９５質量％以上とすることを意味する。
本発明の封止材シートには、ＥＶＡに加えて他の樹脂が含有されていてもよい。他の樹脂としては、ポリエチレン、ポリプロピレン等のポリオレフィン；アイオノマー；エチレン－メタクリル酸共重合体；エチレン－アクリル酸共重合体；ポリフッ化ビニル；ポリ塩化ビニル、またはこれらの共重合体等が挙げられる。
本発明の封止材シートの樹脂基材中のＥＶＡの割合は、９５質量％以上が好ましく、９７質量％以上がより好ましく、１００質量％が特に好ましい。 It is preferable that EVA is used as a main component for the resin base material which forms the sealing material sheet of this invention. EVA is advantageous in that it has high transparency, is inexpensive, and has a particularly large past record of use. “Eva as a main component” means that EVA is 95% by mass or more based on the total amount of the resin base material.
The sealing material sheet of the present invention may contain other resins in addition to EVA. Examples of other resins include polyolefins such as polyethylene and polypropylene; ionomers; ethylene-methacrylic acid copolymers; ethylene-acrylic acid copolymers; polyvinyl fluoride; polyvinyl chloride or copolymers thereof.
95 mass% or more is preferable, as for the ratio of EVA in the resin base material of the sealing material sheet of this invention, 97 mass% or more is more preferable, and 100 mass% is especially preferable.
本発明の封止材シートには、ＥＶＡに加えて他の樹脂が含有されていてもよい。他の樹脂としては、ポリエチレン、ポリプロピレン等のポリオレフィン；アイオノマー；エチレン－メタクリル酸共重合体；エチレン－アクリル酸共重合体；ポリフッ化ビニル；ポリ塩化ビニル、またはこれらの共重合体等が挙げられる。
本発明の封止材シートの樹脂基材中のＥＶＡの割合は、９５質量％以上が好ましく、９７質量％以上がより好ましく、１００質量％が特に好ましい。 It is preferable that EVA is used as a main component for the resin base material which forms the sealing material sheet of this invention. EVA is advantageous in that it has high transparency, is inexpensive, and has a particularly large past record of use. “Eva as a main component” means that EVA is 95% by mass or more based on the total amount of the resin base material.
The sealing material sheet of the present invention may contain other resins in addition to EVA. Examples of other resins include polyolefins such as polyethylene and polypropylene; ionomers; ethylene-methacrylic acid copolymers; ethylene-acrylic acid copolymers; polyvinyl fluoride; polyvinyl chloride or copolymers thereof.
95 mass% or more is preferable, as for the ratio of EVA in the resin base material of the sealing material sheet of this invention, 97 mass% or more is more preferable, and 100 mass% is especially preferable.
前記樹脂基材のＭＦＲ（メルトフローレート）は、２０～４０ｇ／１０分が好ましい。樹脂基材のＭＦＲは、共重合体であれば、共重合成分に由来する単位の含有率を調節することにより調節できる。ＥＶＡのＭＦＲは、ＥＶＡ１００質量％中の酢酸ビニル単位の含有率を調節することにより調節できる。
ＥＶＡが有する全単位１００質量％中の酢酸ビニル単位の含有率は、２０～４０質量％が好ましく、２５～３５質量％がより好ましい。
また、ＭＦＲは、分子量を調節することでも調節でき、分子量を大きくすることでＭＦＲが小さくなる。
前記ＭＦＲは、ＡＳＴＭＤ１２３８に準拠した方法で測定される。 The MFR (melt flow rate) of the resin base material is preferably 20 to 40 g / 10 minutes. If MFR of a resin base material is a copolymer, it can be adjusted by adjusting the content rate of the unit derived from a copolymerization component. The MFR of EVA can be adjusted by adjusting the content of vinyl acetate units in 100% by mass of EVA.
The content of vinyl acetate units in 100% by mass of all units of EVA is preferably 20 to 40% by mass, and more preferably 25 to 35% by mass.
The MFR can also be adjusted by adjusting the molecular weight, and the MFR is decreased by increasing the molecular weight.
The MFR is measured by a method based on ASTM D1238.
ＥＶＡが有する全単位１００質量％中の酢酸ビニル単位の含有率は、２０～４０質量％が好ましく、２５～３５質量％がより好ましい。
また、ＭＦＲは、分子量を調節することでも調節でき、分子量を大きくすることでＭＦＲが小さくなる。
前記ＭＦＲは、ＡＳＴＭＤ１２３８に準拠した方法で測定される。 The MFR (melt flow rate) of the resin base material is preferably 20 to 40 g / 10 minutes. If MFR of a resin base material is a copolymer, it can be adjusted by adjusting the content rate of the unit derived from a copolymerization component. The MFR of EVA can be adjusted by adjusting the content of vinyl acetate units in 100% by mass of EVA.
The content of vinyl acetate units in 100% by mass of all units of EVA is preferably 20 to 40% by mass, and more preferably 25 to 35% by mass.
The MFR can also be adjusted by adjusting the molecular weight, and the MFR is decreased by increasing the molecular weight.
The MFR is measured by a method based on ASTM D1238.
本発明の封止材シートは、架橋剤として、下記条件（Ａ）及び条件（Ｂ）を満たす有機過酸化物（以下、「有機過酸化物Ｉ」という。）を含有することを特徴とする。
（Ａ）半径が１．８ｃｍの底面を有し、深さが０．９ｃｍの円筒容器内で、０．１５ｇの有機過酸化物を５０℃の条件で５時間保管したときの揮発量が１５質量％以下である。
（Ｂ）有機過酸化物が１時間で半減する分解温度が１１５～１４０℃である。 The sealing material sheet of the present invention contains an organic peroxide that satisfies the following conditions (A) and (B) as a crosslinking agent (hereinafter referred to as “organic peroxide I”). .
(A) The amount of volatilization when 0.15 g of organic peroxide is stored at 50 ° C. for 5 hours in a cylindrical container having a bottom with a radius of 1.8 cm and a depth of 0.9 cm is 15 It is below mass%.
(B) The decomposition temperature at which the organic peroxide is halved in 1 hour is 115 to 140 ° C.
（Ａ）半径が１．８ｃｍの底面を有し、深さが０．９ｃｍの円筒容器内で、０．１５ｇの有機過酸化物を５０℃の条件で５時間保管したときの揮発量が１５質量％以下である。
（Ｂ）有機過酸化物が１時間で半減する分解温度が１１５～１４０℃である。 The sealing material sheet of the present invention contains an organic peroxide that satisfies the following conditions (A) and (B) as a crosslinking agent (hereinafter referred to as “organic peroxide I”). .
(A) The amount of volatilization when 0.15 g of organic peroxide is stored at 50 ° C. for 5 hours in a cylindrical container having a bottom with a radius of 1.8 cm and a depth of 0.9 cm is 15 It is below mass%.
(B) The decomposition temperature at which the organic peroxide is halved in 1 hour is 115 to 140 ° C.
従来、輸送後の封止材シートや、一定期間保存した後の封止材シートを用いて太陽電池モジュールを製造した場合に、封止材層の架橋率が低下し、得られる太陽電池モジュールの耐久性が著しく低下することがあった。このことについて、本発明者等が詳しく検討を行ったところ、輸送後や、一定期間保存した後の封止材シートでは、該封止材シート中に含有されている有機過酸化物が揮発し、その量が減少していることが判明した。そこで、本発明者等は、前記条件（Ａ）を満たす有機過酸化物Ｉを用いることで、有機過酸化物が封止材シートから揮発してしまうことを抑制し、輸送後や、一定期間保存した後の封止材シートを使用しても高品質な太陽電池モジュールを安定して製造できることを見い出した。
Conventionally, when a solar cell module is manufactured using a sealing material sheet after transportation or a sealing material sheet that has been stored for a certain period of time, the crosslinking rate of the sealing material layer decreases, and the resulting solar cell module Durability may be significantly reduced. As a result of detailed examinations by the present inventors, the organic peroxide contained in the encapsulant sheet is volatilized in the encapsulant sheet after transportation or after being stored for a certain period of time. , It turned out that the amount has decreased. Therefore, the present inventors suppress the organic peroxide from volatilizing from the encapsulant sheet by using the organic peroxide I that satisfies the condition (A), and after transportation or for a certain period of time. It has been found that a high-quality solar cell module can be stably produced even if the encapsulant sheet after storage is used.
また、有機過酸化物Ｉは、１時間で半減する分解温度が１１５～１４０℃である。有機過酸化物Ｉの前記分解温度が１１５℃以上であれば、シート成形時に架橋反応が進行して封止材シート内にゲルが発生することを抑制できる。また、有機過酸化物Ｉの前記分解温度が１４０℃以下であれば、太陽電池モジュールの製造の際、架橋反応が充分に進行し、封止材層の架橋率が高くなるため、優れた耐久性を有する太陽電池モジュールが得られる。
Further, the organic peroxide I has a decomposition temperature of 115 to 140 ° C., which is halved in 1 hour. If the decomposition temperature of the organic peroxide I is 115 ° C. or higher, it is possible to suppress the occurrence of gel in the encapsulant sheet due to the progress of the crosslinking reaction during sheet molding. Further, if the decomposition temperature of the organic peroxide I is 140 ° C. or lower, the crosslinking reaction proceeds sufficiently during the production of the solar cell module, and the crosslinking material has a high crosslinking rate, so that it has excellent durability. A solar cell module having the property can be obtained.
有機過酸化物Ｉとしては、ｔ－ブチルパーオキシ－２－エチルヘキシルモノカーボネート（条件（Ａ）の揮発量：７．２質量％、条件（Ｂ）の熱分解温度：１１９℃）が好ましい。
As the organic peroxide I, t-butylperoxy-2-ethylhexyl monocarbonate (the volatilization amount of the condition (A): 7.2% by mass, the thermal decomposition temperature of the condition (B): 119 ° C.) is preferable.
本発明の封止材シートに含有される有機過酸化物Ｉは、１種類であることが好ましい。有機過酸化物Ｉが２種類以上含有されている場合は、それらの有機過酸化物Ｉの揮発性の違いから、一定期間経過後の封止材シート内において有機過酸化物Ｉの種類ごとの比率が変化して不均一になるおそれがある。しかし、有機過酸化物Ｉが１種類であれば、一定期間経過後であっても封止材シート内における有機過酸化物Ｉの均一性が保たれやすく、該封止材シートを用いて製造される太陽電池モジュールの特性のばらつきを小さくしやすい。
また、太陽電池モジュールの製造では、通常、２枚の封止材シートで太陽電池セルを挟んだ状態で、真空中で荷重をかけながら加熱し、太陽電池セルを包埋させつつ封止材樹脂を架橋させるが、それら２枚の封止材シートにそれぞれ含有される有機過酸化物Ｉは同一であることが好ましい。同一の有機過酸化物Ｉが含有されている封止材シートを用いれば、一定期間経過後であっても２枚の封止材シート間の有機過酸化物Ｉの量がほぼ同等で、不均一化することも抑制されやすいため、太陽電池モジュールの特性のばらつきを小さくしやすい。 The organic peroxide I contained in the sealing material sheet of the present invention is preferably one type. When two or more types of organic peroxide I are contained, due to the difference in volatility of those organic peroxides I, each type of organic peroxide I in the encapsulant sheet after a certain period of time The ratio may change and become non-uniform. However, if there is only one kind of organic peroxide I, it is easy to maintain the uniformity of the organic peroxide I in the encapsulant sheet even after a lapse of a certain period. It is easy to reduce the variation in the characteristics of the solar cell module.
Also, in the manufacture of solar cell modules, normally, a solar cell is sandwiched between two encapsulant sheets, heated while applying a load in a vacuum, and encapsulating the solar cell while embedding the solar cell However, the organic peroxide I contained in each of the two sealing material sheets is preferably the same. If encapsulant sheets containing the same organic peroxide I are used, the amount of organic peroxide I between the two encapsulant sheets is almost the same even after a certain period of time. Since it is easy to suppress uniformization, it is easy to reduce the variation in the characteristics of the solar cell module.
また、太陽電池モジュールの製造では、通常、２枚の封止材シートで太陽電池セルを挟んだ状態で、真空中で荷重をかけながら加熱し、太陽電池セルを包埋させつつ封止材樹脂を架橋させるが、それら２枚の封止材シートにそれぞれ含有される有機過酸化物Ｉは同一であることが好ましい。同一の有機過酸化物Ｉが含有されている封止材シートを用いれば、一定期間経過後であっても２枚の封止材シート間の有機過酸化物Ｉの量がほぼ同等で、不均一化することも抑制されやすいため、太陽電池モジュールの特性のばらつきを小さくしやすい。 The organic peroxide I contained in the sealing material sheet of the present invention is preferably one type. When two or more types of organic peroxide I are contained, due to the difference in volatility of those organic peroxides I, each type of organic peroxide I in the encapsulant sheet after a certain period of time The ratio may change and become non-uniform. However, if there is only one kind of organic peroxide I, it is easy to maintain the uniformity of the organic peroxide I in the encapsulant sheet even after a lapse of a certain period. It is easy to reduce the variation in the characteristics of the solar cell module.
Also, in the manufacture of solar cell modules, normally, a solar cell is sandwiched between two encapsulant sheets, heated while applying a load in a vacuum, and encapsulating the solar cell while embedding the solar cell However, the organic peroxide I contained in each of the two sealing material sheets is preferably the same. If encapsulant sheets containing the same organic peroxide I are used, the amount of organic peroxide I between the two encapsulant sheets is almost the same even after a certain period of time. Since it is easy to suppress uniformization, it is easy to reduce the variation in the characteristics of the solar cell module.
本発明の封止材シート中の有機過酸化物Ｉの含有量は、ＥＶＡ１００質量部に対して、０．４～１．０質量部であり、０．５～０．８質量部が好ましい。有機過酸化物Ｉの含有量がＥＶＡ１００質量部に対して０．４質量部以上であれば、架橋率が高い封止材層を形成でき、耐久性に優れた太陽電池モジュールを製造できる。有機過酸化物Ｉの含有量がＥＶＡ１００質量部に対して１．０質量部以下であれば、シート成形時に架橋反応が進行して封止材シート内にゲルが発生することを抑制できる。
The content of the organic peroxide I in the sealing material sheet of the present invention is 0.4 to 1.0 part by mass, preferably 0.5 to 0.8 part by mass with respect to 100 parts by mass of EVA. If content of the organic peroxide I is 0.4 mass part or more with respect to 100 mass parts of EVA, a sealing material layer with a high crosslinking rate can be formed, and the solar cell module excellent in durability can be manufactured. If content of the organic peroxide I is 1.0 mass part or less with respect to 100 mass parts of EVA, it can suppress that a crosslinking reaction advances at the time of sheet | seat formation, and a gel generate | occur | produces in a sealing material sheet.
また、本発明の封止材シートには、前記有機過酸化物の他に、架橋反応を促進する架橋助剤が含有されていてもよい。架橋助剤としては、トリアリルイソシアヌレート、ジアリルフタレート、トリアリルシアヌレート等が挙げられる。
Moreover, the sealing material sheet of the present invention may contain a crosslinking aid for promoting the crosslinking reaction in addition to the organic peroxide. Examples of the crosslinking aid include triallyl isocyanurate, diallyl phthalate, triallyl cyanurate and the like.
また、本発明の封止材シートには、太陽電池モジュールにおいて、封止材層と表面保護部材および裏面保護部材との接着性を向上させるために、シランカップリング剤が含有されていてもよい。シランカップリング剤としては、γ－メタクリロキシプロピルトリメトキシシラン、リメトキシプロピルシラン、トリメトキシメチルシラン、ビニルトリメトキシシラン、ビニルトリエトキシシラン、トリクロロプロピルシラン、トリエトキシフェニルシラン等が挙げられる。
Moreover, in the solar cell module, the sealing material sheet of the present invention may contain a silane coupling agent in order to improve the adhesion between the sealing material layer, the surface protection member, and the back surface protection member. . Examples of the silane coupling agent include γ-methacryloxypropyltrimethoxysilane, limethoxypropylsilane, trimethoxymethylsilane, vinyltrimethoxysilane, vinyltriethoxysilane, trichloropropylsilane, triethoxyphenylsilane, and the like.
また、本発明の封止材シートには、形成される封止材層の耐久性を向上させるために、紫外線吸収剤、酸化防止剤等の安定化剤が含有されていてもよい。
耐光性の向上のために用いられる紫外線吸収剤としては、２－（５－メチル－２－ヒドロキシフェニル）ベンゾトリアゾール、２－（３－ｔ－ブチル－５－メチル－２－ヒドロキシフェニル）－５－クロロベンゾトリアゾール、２－（４，６－ジフェニル－１，３，５－トリアジン－２－イル）－５－［（ヘキシル）オキシ］－フェノール、２，４－ジヒドロキシベンゾフェノン、２－ヒドロキシ－４－ｎ－オクチルオキシベンゾフェノン等が挙げられる。
熱安定性の向上のために用いられる酸化防止剤としては、１，６－ヘキサンジオール－ビス［３－（３，５－ジ－ｔ－ブチル－４－ヒドロキシフェニル）プロピオネート］、ペンタエリスリチル－テトラキス［３－（３，５－ジ－ｔ－ブチル－４－ヒドロキシフェニル）プロピオネート］、トリス（２，４－ジ－ｔ－ブチルフェニル）フォスファイト、２，４－ビス－（ｎ－オクチルチオ）－６－（４－ヒドロキシ－３，５－ジ－ｔ－ブチルアニリノ）－１，３，５－トリアジン、オクタデシル－３－（３，５－ジ－ｔ－ブチル－４－ヒドロキシフェニル）プロピオネート等が挙げられる。 Moreover, in order to improve the durability of the sealing material layer formed, the sealing material sheet of this invention may contain stabilizers, such as a ultraviolet absorber and antioxidant.
Examples of ultraviolet absorbers used for improving light resistance include 2- (5-methyl-2-hydroxyphenyl) benzotriazole and 2- (3-t-butyl-5-methyl-2-hydroxyphenyl) -5. -Chlorobenzotriazole, 2- (4,6-diphenyl-1,3,5-triazin-2-yl) -5-[(hexyl) oxy] -phenol, 2,4-dihydroxybenzophenone, 2-hydroxy-4 -N-octyloxybenzophenone and the like.
Antioxidants used for improving thermal stability include 1,6-hexanediol-bis [3- (3,5-di-t-butyl-4-hydroxyphenyl) propionate], pentaerythrityl- Tetrakis [3- (3,5-di-tert-butyl-4-hydroxyphenyl) propionate], tris (2,4-di-tert-butylphenyl) phosphite, 2,4-bis- (n-octylthio) -6- (4-hydroxy-3,5-di-t-butylanilino) -1,3,5-triazine, octadecyl-3- (3,5-di-t-butyl-4-hydroxyphenyl) propionate Can be mentioned.
耐光性の向上のために用いられる紫外線吸収剤としては、２－（５－メチル－２－ヒドロキシフェニル）ベンゾトリアゾール、２－（３－ｔ－ブチル－５－メチル－２－ヒドロキシフェニル）－５－クロロベンゾトリアゾール、２－（４，６－ジフェニル－１，３，５－トリアジン－２－イル）－５－［（ヘキシル）オキシ］－フェノール、２，４－ジヒドロキシベンゾフェノン、２－ヒドロキシ－４－ｎ－オクチルオキシベンゾフェノン等が挙げられる。
熱安定性の向上のために用いられる酸化防止剤としては、１，６－ヘキサンジオール－ビス［３－（３，５－ジ－ｔ－ブチル－４－ヒドロキシフェニル）プロピオネート］、ペンタエリスリチル－テトラキス［３－（３，５－ジ－ｔ－ブチル－４－ヒドロキシフェニル）プロピオネート］、トリス（２，４－ジ－ｔ－ブチルフェニル）フォスファイト、２，４－ビス－（ｎ－オクチルチオ）－６－（４－ヒドロキシ－３，５－ジ－ｔ－ブチルアニリノ）－１，３，５－トリアジン、オクタデシル－３－（３，５－ジ－ｔ－ブチル－４－ヒドロキシフェニル）プロピオネート等が挙げられる。 Moreover, in order to improve the durability of the sealing material layer formed, the sealing material sheet of this invention may contain stabilizers, such as a ultraviolet absorber and antioxidant.
Examples of ultraviolet absorbers used for improving light resistance include 2- (5-methyl-2-hydroxyphenyl) benzotriazole and 2- (3-t-butyl-5-methyl-2-hydroxyphenyl) -5. -Chlorobenzotriazole, 2- (4,6-diphenyl-1,3,5-triazin-2-yl) -5-[(hexyl) oxy] -phenol, 2,4-dihydroxybenzophenone, 2-hydroxy-4 -N-octyloxybenzophenone and the like.
Antioxidants used for improving thermal stability include 1,6-hexanediol-bis [3- (3,5-di-t-butyl-4-hydroxyphenyl) propionate], pentaerythrityl- Tetrakis [3- (3,5-di-tert-butyl-4-hydroxyphenyl) propionate], tris (2,4-di-tert-butylphenyl) phosphite, 2,4-bis- (n-octylthio) -6- (4-hydroxy-3,5-di-t-butylanilino) -1,3,5-triazine, octadecyl-3- (3,5-di-t-butyl-4-hydroxyphenyl) propionate Can be mentioned.
（封止材シートの製造方法）
本発明の封止材シートは、架橋剤として、前述した有機過酸化物Ｉを用いる以外は、公知の製造方法で製造できる。例えば、前記樹脂基材に、有機過酸化物、及び必要に応じて添加する添加剤を混合して加熱溶融させた樹脂を、Ｔダイ等を用いて押し出す共押し出し法で封止材シートを製膜する製膜工程を有する方法が挙げられる。
また、前記製膜工程においては、ブロッキング防止のため、熱溶融した状態の樹脂シートの表面を、凹凸パターンが施されているロール（金属またはゴム製）に密着させることで、該樹脂シート片面もしくは両面に該ロールの凹凸パターンを転写させ、封止材シートにエンボス加工を施してもよい。 (Method for producing sealing material sheet)
The encapsulant sheet of the present invention can be produced by a known production method except that the organic peroxide I described above is used as a crosslinking agent. For example, a sealing material sheet is manufactured by a co-extrusion method in which a resin obtained by mixing an organic peroxide and an additive that is added as necessary to the resin base material and heat-melting the resin is extruded using a T die or the like. The method which has the film forming process which forms a film | membrane is mentioned.
Further, in the film forming step, in order to prevent blocking, the surface of the heat-melted resin sheet is brought into close contact with a roll (made of metal or rubber) on which a concavo-convex pattern is applied. The uneven pattern of the roll may be transferred to both sides, and the encapsulant sheet may be embossed.
本発明の封止材シートは、架橋剤として、前述した有機過酸化物Ｉを用いる以外は、公知の製造方法で製造できる。例えば、前記樹脂基材に、有機過酸化物、及び必要に応じて添加する添加剤を混合して加熱溶融させた樹脂を、Ｔダイ等を用いて押し出す共押し出し法で封止材シートを製膜する製膜工程を有する方法が挙げられる。
また、前記製膜工程においては、ブロッキング防止のため、熱溶融した状態の樹脂シートの表面を、凹凸パターンが施されているロール（金属またはゴム製）に密着させることで、該樹脂シート片面もしくは両面に該ロールの凹凸パターンを転写させ、封止材シートにエンボス加工を施してもよい。 (Method for producing sealing material sheet)
The encapsulant sheet of the present invention can be produced by a known production method except that the organic peroxide I described above is used as a crosslinking agent. For example, a sealing material sheet is manufactured by a co-extrusion method in which a resin obtained by mixing an organic peroxide and an additive that is added as necessary to the resin base material and heat-melting the resin is extruded using a T die or the like. The method which has the film forming process which forms a film | membrane is mentioned.
Further, in the film forming step, in order to prevent blocking, the surface of the heat-melted resin sheet is brought into close contact with a roll (made of metal or rubber) on which a concavo-convex pattern is applied. The uneven pattern of the roll may be transferred to both sides, and the encapsulant sheet may be embossed.
以上説明した本発明の封止材シートは、シート成形時にゲルが発生することが抑制されている。また、輸送後や一定期間保存した後においても、シート中の有機過酸化物が揮発してその量が減少することを抑制されている。そのため、本発明の封止材シートであれば、一定期間経過後の封止材シートであっても、高い架橋率を有する封止材層を安定に形成し、優れた耐久性を有する高品質な太陽電池モジュールを安定して製造できる。
In the sealing material sheet of the present invention described above, the generation of gel during sheet forming is suppressed. Further, it is possible to prevent the organic peroxide in the sheet from volatilizing and reducing its amount after transportation or after storage for a certain period. Therefore, if it is a sealing material sheet of the present invention, even if it is a sealing material sheet after a certain period of time, a high quality that stably forms a sealing material layer having a high crosslinking rate and has excellent durability A stable solar cell module can be manufactured.
＜太陽電池モジュール＞
本発明の太陽電池モジュールは、太陽電池セルと、前記太陽電池セルを封止する封止材層と、前記封止材層の表面側を保護する表面保護部材と、前記封止材層の裏面側を保護する裏面保護部材と、を有し、前記封止材層が、前述した本発明の封止材シートにより形成されているモジュールである。以下、本発明の太陽電池モジュールの実施形態の一例を示して詳細に説明する。 <Solar cell module>
The solar battery module of the present invention includes a solar battery cell, a sealing material layer that seals the solar battery cell, a surface protection member that protects the surface side of the sealing material layer, and a back surface of the sealing material layer. A back surface protection member that protects the side, wherein the sealing material layer is formed of the sealing material sheet of the present invention described above. Hereinafter, an exemplary embodiment of the solar cell module of the present invention will be described in detail.
本発明の太陽電池モジュールは、太陽電池セルと、前記太陽電池セルを封止する封止材層と、前記封止材層の表面側を保護する表面保護部材と、前記封止材層の裏面側を保護する裏面保護部材と、を有し、前記封止材層が、前述した本発明の封止材シートにより形成されているモジュールである。以下、本発明の太陽電池モジュールの実施形態の一例を示して詳細に説明する。 <Solar cell module>
The solar battery module of the present invention includes a solar battery cell, a sealing material layer that seals the solar battery cell, a surface protection member that protects the surface side of the sealing material layer, and a back surface of the sealing material layer. A back surface protection member that protects the side, wherein the sealing material layer is formed of the sealing material sheet of the present invention described above. Hereinafter, an exemplary embodiment of the solar cell module of the present invention will be described in detail.
本実施形態の太陽電池モジュール１は、図１に示すように、太陽電池セル４、４と、太陽電池セル４、４を封止する封止材層３と、封止材層３の表面側を保護する表面保護部材２と、封止材層３の裏面側を保護する裏面保護部材５とを有する。
（太陽電池セル）
太陽電池セル４は、光電効果により受光面に入射した光を電気に変換する機能を有するセルである。太陽電池セル４は、太陽電池モジュール１内において複数個（図１では２つ）が電極（図示省略）によって接続されている。太陽電池セル４の数は特に限定されない。
太陽電池セル４の材料としては、例えば、結晶系シリコンが挙げられる。なかでも、製造の簡便さとコスト面から、多結晶シリコンが特に好ましい。 As shown in FIG. 1, the solar cell module 1 of the present embodiment includes solar cells 4 and 4, a sealing material layer 3 that seals the solar cells 4 and 4, and a surface side of the sealing material layer 3. And a back surface protection member 5 for protecting the back surface side of the sealing material layer 3.
(Solar cell)
Thesolar battery cell 4 is a cell having a function of converting light incident on the light receiving surface into electricity by a photoelectric effect. A plurality (two in FIG. 1) of solar cells 4 are connected by electrodes (not shown) in the solar cell module 1. The number of solar cells 4 is not particularly limited.
Examples of the material of thesolar battery cell 4 include crystalline silicon. Among these, polycrystalline silicon is particularly preferable from the viewpoint of manufacturing simplicity and cost.
（太陽電池セル）
太陽電池セル４は、光電効果により受光面に入射した光を電気に変換する機能を有するセルである。太陽電池セル４は、太陽電池モジュール１内において複数個（図１では２つ）が電極（図示省略）によって接続されている。太陽電池セル４の数は特に限定されない。
太陽電池セル４の材料としては、例えば、結晶系シリコンが挙げられる。なかでも、製造の簡便さとコスト面から、多結晶シリコンが特に好ましい。 As shown in FIG. 1, the solar cell module 1 of the present embodiment includes
(Solar cell)
The
Examples of the material of the
（封止材層）
封止材層３は、太陽電池セル４、４を包埋させて封止する層であり、本発明の封止材シートにより形成される。
封止材層３の厚さは、０．３～０．６ｍｍが好ましい。 (Encapsulant layer)
The sealingmaterial layer 3 is a layer that embeds and seals the solar cells 4 and 4 and is formed of the sealing material sheet of the present invention.
The thickness of the sealingmaterial layer 3 is preferably 0.3 to 0.6 mm.
封止材層３は、太陽電池セル４、４を包埋させて封止する層であり、本発明の封止材シートにより形成される。
封止材層３の厚さは、０．３～０．６ｍｍが好ましい。 (Encapsulant layer)
The sealing
The thickness of the sealing
（表面保護部材）
表面保護材２としては、耐久性、耐候性、透明性に優れたものが好ましく、例えば、ガラス板、ポリエチレンテレフタレート等の樹脂シート等が挙げられる。また、ポリカーボネート等の樹脂シートを用いてもよい。
表面保護部材２の厚さは、３～６ｍｍが好ましい。 (Surface protection member)
As the surfaceprotective material 2, those excellent in durability, weather resistance, and transparency are preferable, and examples thereof include a glass sheet, a resin sheet such as polyethylene terephthalate, and the like. Moreover, you may use resin sheets, such as a polycarbonate.
The thickness of thesurface protection member 2 is preferably 3 to 6 mm.
表面保護材２としては、耐久性、耐候性、透明性に優れたものが好ましく、例えば、ガラス板、ポリエチレンテレフタレート等の樹脂シート等が挙げられる。また、ポリカーボネート等の樹脂シートを用いてもよい。
表面保護部材２の厚さは、３～６ｍｍが好ましい。 (Surface protection member)
As the surface
The thickness of the
（裏面保護部材）
裏面保護部材５としては、耐久性、耐候性に優れたものが好ましく、例えば、ポリエチレンテレフタレート、ポリビニルフロライド、ＥＶＡ等の樹脂シート、及びそれらの積層体等が挙げられる。また、前記樹脂シートや積層体には、水蒸気バリア性、酸素バリア性を付与するバリア層を積層してもよい。
裏面保護部材５の厚さは、０．２～０．４ｍｍが好ましい。 (Back protection member)
As the backsurface protection member 5, those excellent in durability and weather resistance are preferable, and examples thereof include resin sheets such as polyethylene terephthalate, polyvinyl fluoride, EVA, and laminates thereof. Moreover, you may laminate | stack the barrier layer which provides water vapor | steam barrier property and oxygen barrier property to the said resin sheet and laminated body.
The thickness of the backsurface protection member 5 is preferably 0.2 to 0.4 mm.
裏面保護部材５としては、耐久性、耐候性に優れたものが好ましく、例えば、ポリエチレンテレフタレート、ポリビニルフロライド、ＥＶＡ等の樹脂シート、及びそれらの積層体等が挙げられる。また、前記樹脂シートや積層体には、水蒸気バリア性、酸素バリア性を付与するバリア層を積層してもよい。
裏面保護部材５の厚さは、０．２～０．４ｍｍが好ましい。 (Back protection member)
As the back
The thickness of the back
（製造方法）
以下、本発明の太陽電池モジュールの製造方法の一例として、前記太陽電池モジュール１の製造方法を説明する。ただし、本発明の太陽電池モジュールの製造方法は以下の方法には限定されない。
図２に示すように、裏面保護部材２、封止材シート３Ａ、太陽電池セル４、４、封止材シート３Ｂ、表面保護部材５をこの順に積層して積層体１Ａとする。次いで、積層体１Ａを真空状態で加熱加圧する真空ラミネートを行い、封止材シート３Ａ、３Ｂ内に太陽電池セル４、４を埋没させ、封止材シート３Ａ、３Ｂの透明樹脂基材（ＥＶＡ）を架橋硬化させて接着一体化することで封止材層３を形成させる。これにより、太陽電池モジュール１が得られる。
封止材シート３Ａと封止材シート３Ｂは本発明の封止材シートであり、同じ組成の封止材シートであってもよく、異なる組成の封止材シートであってもよいが、均一に架橋構造が形成されることで良好な品質のモジュールが得られやすい点から、同じ組成の封止材シートであることが好ましい。 (Production method)
Hereinafter, the manufacturing method of the said solar cell module 1 is demonstrated as an example of the manufacturing method of the solar cell module of this invention. However, the manufacturing method of the solar cell module of the present invention is not limited to the following method.
As shown in FIG. 2, the backsurface protection member 2, the sealing material sheet 3A, the solar battery cells 4, 4, the sealing material sheet 3B, and the surface protection member 5 are laminated in this order to form a laminated body 1A. Subsequently, the laminated body 1A is vacuum-laminated by heating and pressurizing in a vacuum state, the solar battery cells 4 and 4 are embedded in the sealing material sheets 3A and 3B, and the transparent resin base material (EVA) of the sealing material sheets 3A and 3B is obtained. ) Is cured by cross-linking, and the sealing material layer 3 is formed. Thereby, the solar cell module 1 is obtained.
The sealingmaterial sheet 3A and the sealing material sheet 3B are the sealing material sheets of the present invention, may be the same composition sealing material sheet, may be different composition sealing material sheet, but uniform It is preferable that the sealing material sheet has the same composition from the viewpoint that a good quality module is easily obtained by forming a crosslinked structure.
以下、本発明の太陽電池モジュールの製造方法の一例として、前記太陽電池モジュール１の製造方法を説明する。ただし、本発明の太陽電池モジュールの製造方法は以下の方法には限定されない。
図２に示すように、裏面保護部材２、封止材シート３Ａ、太陽電池セル４、４、封止材シート３Ｂ、表面保護部材５をこの順に積層して積層体１Ａとする。次いで、積層体１Ａを真空状態で加熱加圧する真空ラミネートを行い、封止材シート３Ａ、３Ｂ内に太陽電池セル４、４を埋没させ、封止材シート３Ａ、３Ｂの透明樹脂基材（ＥＶＡ）を架橋硬化させて接着一体化することで封止材層３を形成させる。これにより、太陽電池モジュール１が得られる。
封止材シート３Ａと封止材シート３Ｂは本発明の封止材シートであり、同じ組成の封止材シートであってもよく、異なる組成の封止材シートであってもよいが、均一に架橋構造が形成されることで良好な品質のモジュールが得られやすい点から、同じ組成の封止材シートであることが好ましい。 (Production method)
Hereinafter, the manufacturing method of the said solar cell module 1 is demonstrated as an example of the manufacturing method of the solar cell module of this invention. However, the manufacturing method of the solar cell module of the present invention is not limited to the following method.
As shown in FIG. 2, the back
The sealing
以上説明した太陽電池モジュールは、本発明の封止材シートを用いているため、該封止材シートが輸送後や一定期間保管した後のものであっても、封止材層の架橋率が高く、優れた耐久性を有しており高品質である。
Since the solar cell module described above uses the encapsulant sheet of the present invention, the encapsulant layer has a crosslinking rate even after the encapsulant sheet is transported or stored for a certain period of time. High, excellent durability and high quality.
以下、実施例及び比較例を示して本発明を詳細に説明する。ただし、本発明は以下の記載によっては限定されない。
本実施例で用いた有機過酸化物の揮発量（単位：質量％）は、底面の半径が１．８ｃｍ、深さが０．９ｃｍの円筒容器の中に、有機過酸化物を０．１５ｇ投入し、５０℃の条件で５時間保管し、保管前後の質量から算出した。 Hereinafter, the present invention will be described in detail with reference to Examples and Comparative Examples. However, the present invention is not limited by the following description.
The volatilization amount (unit: mass%) of the organic peroxide used in this example was 0.15 g of the organic peroxide in a cylindrical container having a bottom radius of 1.8 cm and a depth of 0.9 cm. The sample was put in, stored at 50 ° C. for 5 hours, and calculated from the mass before and after storage.
本実施例で用いた有機過酸化物の揮発量（単位：質量％）は、底面の半径が１．８ｃｍ、深さが０．９ｃｍの円筒容器の中に、有機過酸化物を０．１５ｇ投入し、５０℃の条件で５時間保管し、保管前後の質量から算出した。 Hereinafter, the present invention will be described in detail with reference to Examples and Comparative Examples. However, the present invention is not limited by the following description.
The volatilization amount (unit: mass%) of the organic peroxide used in this example was 0.15 g of the organic peroxide in a cylindrical container having a bottom radius of 1.8 cm and a depth of 0.9 cm. The sample was put in, stored at 50 ° C. for 5 hours, and calculated from the mass before and after storage.
［使用原料］
本実施例で使用した原料を以下に示す。
（ＥＶＡ）
ＥＶＡ－１：酢酸ビニル単位の含有量が３０質量％で、ＭＦＲが３０ｇ／１０分のＥＶＡ [Raw materials]
The raw materials used in this example are shown below.
(EVA)
EVA-1: EVA having a vinyl acetate unit content of 30% by mass and an MFR of 30 g / 10 min
本実施例で使用した原料を以下に示す。
（ＥＶＡ）
ＥＶＡ－１：酢酸ビニル単位の含有量が３０質量％で、ＭＦＲが３０ｇ／１０分のＥＶＡ [Raw materials]
The raw materials used in this example are shown below.
(EVA)
EVA-1: EVA having a vinyl acetate unit content of 30% by mass and an MFR of 30 g / 10 min
（有機過酸化物）
Ｉ－１：ｔ－ブチルパーオキシ－２－エチルヘキシルモノカーボネート
ＩＩ－１：１，１－ジ（ｔ－ブチルパーオキシ）－３，３，５－トリメチルシクロヘキサン
ＩＩ－２：２，５－ジメチル－２，５－ジ（ｔ－ブチルパーオキシ）ヘキサン (Organic peroxide)
I-1: t-butyl peroxy-2-ethylhexyl monocarbonate II-1: 1,1-di (t-butylperoxy) -3,3,5-trimethylcyclohexane II-2: 2,5-dimethyl- 2,5-di (t-butylperoxy) hexane
Ｉ－１：ｔ－ブチルパーオキシ－２－エチルヘキシルモノカーボネート
ＩＩ－１：１，１－ジ（ｔ－ブチルパーオキシ）－３，３，５－トリメチルシクロヘキサン
ＩＩ－２：２，５－ジメチル－２，５－ジ（ｔ－ブチルパーオキシ）ヘキサン (Organic peroxide)
I-1: t-butyl peroxy-2-ethylhexyl monocarbonate II-1: 1,1-di (t-butylperoxy) -3,3,5-trimethylcyclohexane II-2: 2,5-dimethyl- 2,5-di (t-butylperoxy) hexane
（架橋助剤）
ＩＩＩ－１：トリアリルイソシアヌレート (Crosslinking aid)
III-1: Triallyl isocyanurate
ＩＩＩ－１：トリアリルイソシアヌレート (Crosslinking aid)
III-1: Triallyl isocyanurate
（シランカップリング剤）
ＩＶ－１：γ－メタクリロキシプロピルトリメトキシシラン (Silane coupling agent)
IV-1: γ-methacryloxypropyltrimethoxysilane
ＩＶ－１：γ－メタクリロキシプロピルトリメトキシシラン (Silane coupling agent)
IV-1: γ-methacryloxypropyltrimethoxysilane
（紫外線吸収剤）
Ｖ－１：２－ヒドロキシ－４－ｎ－オクチルオキシベンゾフェノン (UV absorber)
V-1: 2-hydroxy-4-n-octyloxybenzophenone
Ｖ－１：２－ヒドロキシ－４－ｎ－オクチルオキシベンゾフェノン (UV absorber)
V-1: 2-hydroxy-4-n-octyloxybenzophenone
（酸化防止剤）
ＶＩ－１：オクタデシル－３－（３，５－ジ－ｔ－ブチル－４－ヒドロキシフェニル）プロピオネート (Antioxidant)
VI-1: Octadecyl-3- (3,5-di-t-butyl-4-hydroxyphenyl) propionate
ＶＩ－１：オクタデシル－３－（３，５－ジ－ｔ－ブチル－４－ヒドロキシフェニル）プロピオネート (Antioxidant)
VI-1: Octadecyl-3- (3,5-di-t-butyl-4-hydroxyphenyl) propionate
（光安定剤）
ＶＩＩ－１：ビス（２，２，６，６－テトラメチル－４－ピペリジル）セバケート (Light stabilizer)
VII-1: Bis (2,2,6,6-tetramethyl-4-piperidyl) sebacate
ＶＩＩ－１：ビス（２，２，６，６－テトラメチル－４－ピペリジル）セバケート (Light stabilizer)
VII-1: Bis (2,2,6,6-tetramethyl-4-piperidyl) sebacate
［実施例１］
ＥＶＡ－１の１００質量部に対して、有機過酸化物Ｉ－１を０．７質量部、架橋助剤ＩＩＩ－１を０．５質量部、シランカップリング剤ＩＶ－１を０．５質量部、紫外線吸収剤Ｖ－１を０．１質量部、酸化防止剤ＶＩ－１を０．１質量部、及び光安定剤ＶＩＩ－１を０．２質量部添加した。
次いで、押し出し成形機を用いて、前記組成物を０．４０～０．５０ｍｍの厚みとなるように成形温度１１０℃で押し出し法によりシート成形した。得られた封止材シートの厚さは、電子マイクロメーター（アンリツ製Ｋ３５１Ｃ）により測定した。 [Example 1]
With respect to 100 parts by mass of EVA-1, 0.7 parts by mass of organic peroxide I-1, 0.5 parts by mass of crosslinking assistant III-1, and 0.5 parts by mass of silane coupling agent IV-1 Part, 0.1 part by weight of the UV absorber V-1, 0.1 part by weight of the antioxidant VI-1, and 0.2 part by weight of the light stabilizer VII-1.
Subsequently, the composition was sheet-formed by an extrusion method at a molding temperature of 110 ° C. so as to have a thickness of 0.40 to 0.50 mm using an extrusion molding machine. The thickness of the obtained sealing material sheet was measured with an electronic micrometer (K351C manufactured by Anritsu).
ＥＶＡ－１の１００質量部に対して、有機過酸化物Ｉ－１を０．７質量部、架橋助剤ＩＩＩ－１を０．５質量部、シランカップリング剤ＩＶ－１を０．５質量部、紫外線吸収剤Ｖ－１を０．１質量部、酸化防止剤ＶＩ－１を０．１質量部、及び光安定剤ＶＩＩ－１を０．２質量部添加した。
次いで、押し出し成形機を用いて、前記組成物を０．４０～０．５０ｍｍの厚みとなるように成形温度１１０℃で押し出し法によりシート成形した。得られた封止材シートの厚さは、電子マイクロメーター（アンリツ製Ｋ３５１Ｃ）により測定した。 [Example 1]
With respect to 100 parts by mass of EVA-1, 0.7 parts by mass of organic peroxide I-1, 0.5 parts by mass of crosslinking assistant III-1, and 0.5 parts by mass of silane coupling agent IV-1 Part, 0.1 part by weight of the UV absorber V-1, 0.1 part by weight of the antioxidant VI-1, and 0.2 part by weight of the light stabilizer VII-1.
Subsequently, the composition was sheet-formed by an extrusion method at a molding temperature of 110 ° C. so as to have a thickness of 0.40 to 0.50 mm using an extrusion molding machine. The thickness of the obtained sealing material sheet was measured with an electronic micrometer (K351C manufactured by Anritsu).
［実施例２～３］
有機過酸化物Ｉ－１の添加量を表１に示すように変更した以外は、実施例１と同様にして封止材シートを製造した。 [Examples 2 to 3]
A sealing material sheet was produced in the same manner as in Example 1 except that the amount of the organic peroxide I-1 was changed as shown in Table 1.
有機過酸化物Ｉ－１の添加量を表１に示すように変更した以外は、実施例１と同様にして封止材シートを製造した。 [Examples 2 to 3]
A sealing material sheet was produced in the same manner as in Example 1 except that the amount of the organic peroxide I-1 was changed as shown in Table 1.
［比較例１～４］
用いる有機過酸化物の種類と添加量を表１に示す通りに変更した以外は、実施例１と同様にして封止材シートを製造した。 [Comparative Examples 1 to 4]
A sealing material sheet was produced in the same manner as in Example 1 except that the type and addition amount of the organic peroxide used were changed as shown in Table 1.
用いる有機過酸化物の種類と添加量を表１に示す通りに変更した以外は、実施例１と同様にして封止材シートを製造した。 [Comparative Examples 1 to 4]
A sealing material sheet was produced in the same manner as in Example 1 except that the type and addition amount of the organic peroxide used were changed as shown in Table 1.
［評価方法］
（初期架橋率）
実施例及び比較例において製造した封止材シートを用いて、常温常湿の環境で６時間放置後、架橋率を測定した。架橋率は以下の方法で測定した。
封止材シートを１気圧で加圧しながら１５０℃で１０分間キュアしたものから、少量（０．３ｇ程度）のサンプルを削り出してその質量を測定した（質量Ｗ１）。また、そのサンプルを５０ｍＬのキシレン中において１１０℃で６時間加熱した後、未溶解物の質量を測定した（質量Ｗ２）。質量Ｗ１に対する質量Ｗ２の割合（Ｗ２／Ｗ１）を架橋率（単位：％）とした。 [Evaluation methods]
(Initial crosslinking rate)
Using the sealing material sheets produced in Examples and Comparative Examples, the crosslinking rate was measured after being left for 6 hours in an environment of normal temperature and humidity. The crosslinking rate was measured by the following method.
A small amount (about 0.3 g) of a sample was cut out from what was cured at 150 ° C. for 10 minutes while pressurizing the sealing material sheet at 1 atm, and its mass was measured (mass W1). Moreover, after heating the sample in 110 mL for 6 hours in 50 mL xylene, the mass of the undissolved material was measured (mass W2). The ratio of the mass W2 to the mass W1 (W2 / W1) was defined as the crosslinking rate (unit:%).
（初期架橋率）
実施例及び比較例において製造した封止材シートを用いて、常温常湿の環境で６時間放置後、架橋率を測定した。架橋率は以下の方法で測定した。
封止材シートを１気圧で加圧しながら１５０℃で１０分間キュアしたものから、少量（０．３ｇ程度）のサンプルを削り出してその質量を測定した（質量Ｗ１）。また、そのサンプルを５０ｍＬのキシレン中において１１０℃で６時間加熱した後、未溶解物の質量を測定した（質量Ｗ２）。質量Ｗ１に対する質量Ｗ２の割合（Ｗ２／Ｗ１）を架橋率（単位：％）とした。 [Evaluation methods]
(Initial crosslinking rate)
Using the sealing material sheets produced in Examples and Comparative Examples, the crosslinking rate was measured after being left for 6 hours in an environment of normal temperature and humidity. The crosslinking rate was measured by the following method.
A small amount (about 0.3 g) of a sample was cut out from what was cured at 150 ° C. for 10 minutes while pressurizing the sealing material sheet at 1 atm, and its mass was measured (mass W1). Moreover, after heating the sample in 110 mL for 6 hours in 50 mL xylene, the mass of the undissolved material was measured (mass W2). The ratio of the mass W2 to the mass W1 (W2 / W1) was defined as the crosslinking rate (unit:%).
（保存安定性）
実施例及び比較例で得られた封止材シートを、温度４０℃－湿度２０％ＲＨの恒温恒湿槽の中のメッシュ状の保管箱に、他のシートと重ね合わせないで設置し、４８時間保管した。その後、該封止材シートを取り出し、常温常湿の環境で６時間放置後、前記初期架橋率で説明した方法と同じ方法で架橋率を測定した。架橋率が８０％以上のものを「○」、８０％に満たなかったものを「×」とした。 (Storage stability)
The sealing material sheets obtained in the examples and comparative examples were placed in a mesh-shaped storage box in a constant temperature and humidity chamber at a temperature of 40 ° C. and a humidity of 20% RH without overlapping with other sheets. Stored for hours. Thereafter, the encapsulant sheet was taken out, allowed to stand for 6 hours in an environment of normal temperature and humidity, and then the crosslinking rate was measured by the same method as described in the initial crosslinking rate. Those with a crosslinking rate of 80% or more were marked with “◯”, and those with less than 80% were marked with “x”.
実施例及び比較例で得られた封止材シートを、温度４０℃－湿度２０％ＲＨの恒温恒湿槽の中のメッシュ状の保管箱に、他のシートと重ね合わせないで設置し、４８時間保管した。その後、該封止材シートを取り出し、常温常湿の環境で６時間放置後、前記初期架橋率で説明した方法と同じ方法で架橋率を測定した。架橋率が８０％以上のものを「○」、８０％に満たなかったものを「×」とした。 (Storage stability)
The sealing material sheets obtained in the examples and comparative examples were placed in a mesh-shaped storage box in a constant temperature and humidity chamber at a temperature of 40 ° C. and a humidity of 20% RH without overlapping with other sheets. Stored for hours. Thereafter, the encapsulant sheet was taken out, allowed to stand for 6 hours in an environment of normal temperature and humidity, and then the crosslinking rate was measured by the same method as described in the initial crosslinking rate. Those with a crosslinking rate of 80% or more were marked with “◯”, and those with less than 80% were marked with “x”.
（加工時のゲルの発生）
実施例及び比較例で得られた封止材シートにおける１ｍ２あたりのゲルの発生数を目視で計測した。計測するゲルは半径２ｍｍ以上のものとした。また、確認面積は２ｍ２とした。１ｍ２あたりのゲルの発生数が１個以上であったものを「×」、０個のものを「○」とした。
実施例及び比較例における初期架橋率、保存安定性及び加工時のゲルの発生の評価結果を表１に示す。 (Generation of gel during processing)
The number of gels generated per 1 m 2 in the sealing material sheets obtained in Examples and Comparative Examples was visually measured. The gel to be measured has a radius of 2 mm or more. The confirmation area was 2 m 2 . The case where the number of gels generated per 1 m 2 was 1 or more was designated as “X”, and the number of gels produced as 0 was designated as “◯”.
Table 1 shows the evaluation results of the initial crosslinking rate, storage stability, and generation of gels during processing in Examples and Comparative Examples.
実施例及び比較例で得られた封止材シートにおける１ｍ２あたりのゲルの発生数を目視で計測した。計測するゲルは半径２ｍｍ以上のものとした。また、確認面積は２ｍ２とした。１ｍ２あたりのゲルの発生数が１個以上であったものを「×」、０個のものを「○」とした。
実施例及び比較例における初期架橋率、保存安定性及び加工時のゲルの発生の評価結果を表１に示す。 (Generation of gel during processing)
The number of gels generated per 1 m 2 in the sealing material sheets obtained in Examples and Comparative Examples was visually measured. The gel to be measured has a radius of 2 mm or more. The confirmation area was 2 m 2 . The case where the number of gels generated per 1 m 2 was 1 or more was designated as “X”, and the number of gels produced as 0 was designated as “◯”.
Table 1 shows the evaluation results of the initial crosslinking rate, storage stability, and generation of gels during processing in Examples and Comparative Examples.
表１に示すように、条件（Ａ）及び条件（Ｂ）を満たす有機過酸化物Ｉを、ＥＶＡ１００質量部に対して０．４～１．０質量部の範囲内で用いた実施例１～３の封止材シートは、初期架橋率が高く、またその保存安定性も優れていた。加えて、該封止材シートは、成形時にゲルも発生しておらず、高品質であった。
As shown in Table 1, the organic peroxide I satisfying the condition (A) and the condition (B) was used in the range of 0.4 to 1.0 part by mass with respect to 100 parts by mass of EVA. The encapsulant sheet 3 had a high initial crosslinking rate and excellent storage stability. In addition, the sealing material sheet was of high quality without generating gel during molding.
一方、条件（Ｂ）の分解温度が１１５℃未満の有機過酸化物を用いた比較例１の封止材シートは、シート成形時にゲルが発生し、品質が劣っていた。
条件（Ａ）の揮発量が１５質量％を超える有機過酸化物を用いた比較例２の封止材シートは、初期架橋率は高いものの、保存後の架橋率が大きく低下しており、保存安定性が低かった。
条件（Ａ）及び条件（Ｂ）を満たす有機過酸化物Ｉを用いているものの、その含有量がＥＶＡ１００質量部に対して０．４質量部未満である比較例３の封止材シートは、保存前の初期の状態ですでに架橋率が８０％以下と低かった。なお、該封止材シートは、初期架橋率が８０質量％未満であったため、保存後の架橋率も保存安定性に関わらず８０質量％未満であった。
条件（Ａ）及び条件（Ｂ）を満たす有機過酸化物Ｉを用いているものの、その含有量がＥＶＡ１００質量部に対して１．０質量部を超える比較例４の封止材シートは、シート成形時にゲルが発生し、品質が劣っていた。 On the other hand, the sealing material sheet of Comparative Example 1 using an organic peroxide having a decomposition temperature of less than 115 ° C. under the condition (B) was inferior in quality because gel was generated during sheet molding.
Although the sealing material sheet of Comparative Example 2 using an organic peroxide having a volatilization amount of more than 15% by mass under the condition (A) has a high initial crosslinking rate, the crosslinking rate after storage is greatly reduced and stored. Stability was low.
Although the organic peroxide I satisfying the conditions (A) and (B) is used, the encapsulant sheet of Comparative Example 3 whose content is less than 0.4 parts by mass with respect to 100 parts by mass of EVA, The crosslinking rate was already as low as 80% or less in the initial state before storage. The encapsulant sheet had an initial crosslinking rate of less than 80% by mass, and thus the crosslinking rate after storage was less than 80% by mass regardless of storage stability.
Although the organic peroxide I satisfying the conditions (A) and (B) is used, the encapsulant sheet of Comparative Example 4 whose content exceeds 1.0 part by mass with respect to 100 parts by mass of EVA is a sheet. Gel was generated during molding and the quality was poor.
条件（Ａ）の揮発量が１５質量％を超える有機過酸化物を用いた比較例２の封止材シートは、初期架橋率は高いものの、保存後の架橋率が大きく低下しており、保存安定性が低かった。
条件（Ａ）及び条件（Ｂ）を満たす有機過酸化物Ｉを用いているものの、その含有量がＥＶＡ１００質量部に対して０．４質量部未満である比較例３の封止材シートは、保存前の初期の状態ですでに架橋率が８０％以下と低かった。なお、該封止材シートは、初期架橋率が８０質量％未満であったため、保存後の架橋率も保存安定性に関わらず８０質量％未満であった。
条件（Ａ）及び条件（Ｂ）を満たす有機過酸化物Ｉを用いているものの、その含有量がＥＶＡ１００質量部に対して１．０質量部を超える比較例４の封止材シートは、シート成形時にゲルが発生し、品質が劣っていた。 On the other hand, the sealing material sheet of Comparative Example 1 using an organic peroxide having a decomposition temperature of less than 115 ° C. under the condition (B) was inferior in quality because gel was generated during sheet molding.
Although the sealing material sheet of Comparative Example 2 using an organic peroxide having a volatilization amount of more than 15% by mass under the condition (A) has a high initial crosslinking rate, the crosslinking rate after storage is greatly reduced and stored. Stability was low.
Although the organic peroxide I satisfying the conditions (A) and (B) is used, the encapsulant sheet of Comparative Example 3 whose content is less than 0.4 parts by mass with respect to 100 parts by mass of EVA, The crosslinking rate was already as low as 80% or less in the initial state before storage. The encapsulant sheet had an initial crosslinking rate of less than 80% by mass, and thus the crosslinking rate after storage was less than 80% by mass regardless of storage stability.
Although the organic peroxide I satisfying the conditions (A) and (B) is used, the encapsulant sheet of Comparative Example 4 whose content exceeds 1.0 part by mass with respect to 100 parts by mass of EVA is a sheet. Gel was generated during molding and the quality was poor.
１ 太陽電池モジュール
２ 表面保護部材
３ 封止材層
３Ａ、３Ｂ 封止材シート
４ 太陽電池セル
５ 裏面保護部材 DESCRIPTION OF SYMBOLS 1Solar cell module 2 Surface protection member 3 Sealing material layer 3A, 3B Sealing material sheet 4 Solar cell 5 Back surface protection member
２ 表面保護部材
３ 封止材層
３Ａ、３Ｂ 封止材シート
４ 太陽電池セル
５ 裏面保護部材 DESCRIPTION OF SYMBOLS 1
Claims (2)
- エチレン／酢酸ビニル共重合体と有機過酸化物とを含有する太陽電池モジュール用封止材シートであって、
前記有機過酸化物が下記条件（Ａ）及び条件（Ｂ）を満たし、かつ該有機過酸化物の含有量が前記エチレン／酢酸ビニル共重合体１００質量部に対して０．４～１．０質量部である太陽電池モジュール用封止材シート。
（Ａ）半径が１．８ｃｍの底面を有し、深さが０．９ｃｍの円筒容器内で、０．１５ｇの有機過酸化物を５０℃の条件で５時間保管したときの揮発量が１５質量％以下である。
（Ｂ）有機過酸化物が１時間で半減する分解温度が１１５～１４０℃である。 A solar cell module encapsulant sheet comprising an ethylene / vinyl acetate copolymer and an organic peroxide,
The organic peroxide satisfies the following conditions (A) and (B), and the content of the organic peroxide is 0.4 to 1.0 with respect to 100 parts by mass of the ethylene / vinyl acetate copolymer. The sealing material sheet for solar cell modules which is a mass part.
(A) The amount of volatilization when 0.15 g of organic peroxide is stored at 50 ° C. for 5 hours in a cylindrical container having a bottom with a radius of 1.8 cm and a depth of 0.9 cm is 15 It is below mass%.
(B) The decomposition temperature at which the organic peroxide is halved in 1 hour is 115 to 140 ° C. - 太陽電池セルと、前記太陽電池セルを封止する封止材層と、前記封止材層の表面側を保護する表面保護部材と、前記封止材層の裏面側を保護する裏面保護部材と、を有し、
前記封止材層が、請求項１に記載の太陽電池モジュール用封止材シートにより形成されている太陽電池モジュール。 A solar battery cell, a sealing material layer that seals the solar battery cell, a surface protection member that protects the front surface side of the sealing material layer, and a back surface protection member that protects the back surface side of the sealing material layer; Have
The solar cell module in which the said sealing material layer is formed with the sealing material sheet for solar cell modules of Claim 1.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011800117081A CN102782022A (en) | 2010-03-02 | 2011-02-24 | Sealing material sheet for solar cell module, and solar cell module |
| JP2012503093A JPWO2011108433A1 (en) | 2010-03-02 | 2011-02-24 | Solar cell module sealing material sheet and solar cell module |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2010045367 | 2010-03-02 | ||
| JP2010-045367 | 2010-03-02 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2011108433A1 true WO2011108433A1 (en) | 2011-09-09 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/JP2011/054110 WO2011108433A1 (en) | 2010-03-02 | 2011-02-24 | Sealing material sheet for solar cell module, and solar cell module |
Country Status (4)
| Country | Link |
|---|---|
| JP (1) | JPWO2011108433A1 (en) |
| CN (1) | CN102782022A (en) |
| TW (1) | TW201141930A (en) |
| WO (1) | WO2011108433A1 (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002111036A (en) * | 2000-09-29 | 2002-04-12 | Canon Inc | Solar battery module and its execution method |
| JP2007134352A (en) * | 2005-10-13 | 2007-05-31 | Sekisui Film Kk | Adhesive sheet for solar cell |
| JP2008098457A (en) * | 2006-10-13 | 2008-04-24 | Sekisui Chem Co Ltd | Method of manufacturing adhesive sheet for solar cell |
| JP2008205448A (en) * | 2007-01-22 | 2008-09-04 | Bridgestone Corp | Sealing film for solar cells and solar cells using the same |
-
2011
- 2011-02-24 JP JP2012503093A patent/JPWO2011108433A1/en active Pending
- 2011-02-24 CN CN2011800117081A patent/CN102782022A/en active Pending
- 2011-02-24 WO PCT/JP2011/054110 patent/WO2011108433A1/en active Application Filing
- 2011-02-25 TW TW100106319A patent/TW201141930A/en unknown
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002111036A (en) * | 2000-09-29 | 2002-04-12 | Canon Inc | Solar battery module and its execution method |
| JP2007134352A (en) * | 2005-10-13 | 2007-05-31 | Sekisui Film Kk | Adhesive sheet for solar cell |
| JP2008098457A (en) * | 2006-10-13 | 2008-04-24 | Sekisui Chem Co Ltd | Method of manufacturing adhesive sheet for solar cell |
| JP2008205448A (en) * | 2007-01-22 | 2008-09-04 | Bridgestone Corp | Sealing film for solar cells and solar cells using the same |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102782022A (en) | 2012-11-14 |
| TW201141930A (en) | 2011-12-01 |
| JPWO2011108433A1 (en) | 2013-06-27 |
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