CN102569440B - Rear panel for solar cell and method for manufacturing same - Google Patents
Rear panel for solar cell and method for manufacturing same Download PDFInfo
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- CN102569440B CN102569440B CN201110400369.8A CN201110400369A CN102569440B CN 102569440 B CN102569440 B CN 102569440B CN 201110400369 A CN201110400369 A CN 201110400369A CN 102569440 B CN102569440 B CN 102569440B
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- 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
- Y02E10/52—PV systems with concentrators
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Abstract
The invention provides a rear panel for a solar cell and a manufacturing method for the rear panel. The rear panel for a solar cell fully reflects the visible light and the ultraviolet light irradiated from the surface of a solar cell module so as to return the visible light and the ultraviolet light to the solar cell unit. The solar cell unit can generate electricity more effectively. At the same time, through fully reflecting the visible light and the ultraviolet light, the deterioration of the solar cell unit is prevented. The rear panel for the solar cell is characterized by comprising a first film made of polyester, a white layer formed through curing white resin composition containing thermoplastic resin, white pigment and aluminum hydroxide, and a second film made of polyester. The white layer is clamped by the first film and the second film in a laminating manner.
Description
Technical field
The present invention relates to the manufacture method of backboard used for solar batteries and backboard used for solar batteries.
Background technology
In recent years, from the viewpoint of the preventing of environmental pollution, fail safe, the instead energy infrastructure of the energy infrastructure in the past such as fossil fuel, atomic energy, solar cell gets most of the attention.As the solar module used in solar cell, can enumerate: monocrystalline silicon system, polysilicon system, amorphous silicon etc.General solar module utilizes method etc. as described below to manufacture; described method is: successively that they are stacked according to the order of the surface protecting material formed by glass baseplate etc., encapsulant, solar battery cell, encapsulant and backboard, carries out by vacuum laminator etc. the method etc. adding thermo-compressed.
Usually, solar module is arranged on outdoor.Therefore, being exposed to sunlight, encapsulant in the rain and solar battery cell for a long time to protect, requiring that above-mentioned backboard has sufficient thermal endurance, moisture-proof and weatherability.During these require, sufficient moisture-proof particular importance.This is because, moisture from backboard through encapsulant time, encapsulant changes, distribution corrodes, and the power output of solar module reduces.
As the material of such backboard, generally use the polyester that PETG (PET), PEN (PEN) are such.And, such as, by by polyester film-like, fluoropolymer membrane, aluminium-vapour deposition material etc. are fitted thereon or fluorine resin is coated on the function of supplementary polyester film on polyester film.Particularly fluorine, is widely used as giving backboard with the material of intensity, thermal endurance and weatherability (with reference to patent documentation 1).
In addition, disclose a kind of backboard, wherein, in order to make to reflect through the light of solar battery cell from the sunlight of the surface irradiation of solar module and make it turn back to solar battery cell and improve generating efficiency, compounding Chinese white or the white layer (with reference to patent documentation 2) containing Chinese white of fitting on this film in polyester film.
In addition, also disclose a kind of backboard, in order to block the ultraviolet in the sunlight that is irradiated on solar module, this backboard is formed by the polyolefin-based resins film of thermal endurance or the plastic film (with reference to patent documentation 3) of transparent or semitransparent polyolefin-based resins film-stack of the thermal endurance that comprises ultra-violet absorber and Photostabilised dose comprising ultra-violet absorber and Photostabilised dose.
Prior art document
Patent documentation
Patent documentation 1: Japanese Unexamined Patent Publication 2010-232201 publication
Patent documentation 2: Japanese Unexamined Patent Publication 2011-116938 publication
Patent documentation 3: Japanese Unexamined Patent Publication 2011-014559 publication
Summary of the invention
the problem that invention will solve
As mentioned above, in existing backboard, in order to make sunlight reflect, in polyester film compounding Chinese white or on this film laminating containing the white layer of Chinese white.But, although these films or the visible light reflectance of white layer to the wave-length coverage of more than 400nm in sunlight high, low to ultraviolet reflectivity.Therefore, existence is difficult to problem ultraviolet being reflexed to effectively solar battery cell.It should be noted that, can in polyester film, adhesive linkage compounding ultra-violet absorber and block (absorption) ultraviolet, but the raising of the ultraviolet reflectivity caused by it is more difficult.Think from now on, not only can absorb visible ray but also absorb the exploitation that ultraviolet carries out the solar cell generated electricity and can advance, expect to develop a kind of can uv reflectance and make it turn back to backboard used for solar batteries in solar battery cell effectively.
In addition, as mentioned above, the ultraviolet reflectivity of existing backboard is low.And surface and the back side of solar module are all subject to solar light irradiation, therefore, from the ultraviolet radiation damage backboard of surface irradiation, in addition, incide encapsulant from the ultraviolet of back side illuminaton through backboard.Therefore, during long-time use solar module, the weatherability of backboard reduces, and meanwhile, because of the above-mentioned ultraviolet inciding encapsulant, encapsulant and backboard take up heat.Here, as the encapsulant of solar module, the general ethylene-vinyl acetate copolymer resins that uses is (hereinafter referred to as " EVA ".)。At encapsulant described above, backboard with under the state of heat, when ultraviolet incides on the encapsulant near backboard further, EVA decomposes with de-acetic acid, and therefore encapsulant occurs rotten, the problem that the power output producing solar module reduces.It should be noted that, EVA is under the environment of 60 DEG C during prolonged exposure more than 3 hours ultraviolets, and its tissue-binding component acetic acid also can depart from and go bad.
The present invention carries out to solve above-mentioned problem.Specifically, the object of the invention is to, provide a kind of backboard used for solar batteries, it is by making ultraviolet from the surface of solar module and back side illuminaton and visible light's reflection, the generating efficiency of solar battery cell can be improved, going bad of EVA can be prevented.
for the scheme of dealing with problems
Means of the present invention for reaching above-mentioned purpose are as follows.
The feature of backboard used for solar batteries of the present invention is, the white layer possessing the 1st film that formed by polyester and make the white resin composition solidification containing thermoplastic resin and Chinese white and aluminium hydroxide and isocyanate compound and the 2nd film formed by polyester, the mode clamping described white layer with described 1st film and the 2nd film is laminated.
In described backboard, described the 1st film that formed by polyester and the 2nd film are preferably formed by least one in PEN and PETG.In addition, more preferably composition is substantially identical for the 1st film that should be formed by polyester and the 2nd film.
In addition, described Chinese white is preferably titanium oxide, and the content of Chinese white contained in described white resin composition is more preferably 30 ~ 70 % by weight.
And then, described white resin composition preferably also containing heat-curing resin and curing catalysts and organic solvent, in addition more preferably also containing at least one in phenylethylene resin series and acrylic resin.
In addition, in described backboard, easy bonding process can be implemented to the face (being formed or bonding face) contacted with described white layer of described 1st film or described 2nd film or described 1st film and described 2nd film.
And then, further feature of the present invention is, a kind of manufacture method of backboard used for solar batteries is provided, it is characterized in that, comprise following operation: the white resin composition containing thermoplastic resin and Chinese white and aluminium hydroxide and isocyanate compound at the coated on one side of the film formed by polyester is also dry, make its hot curing, thus form the operation of white layer; With the operation of film that other by polyester formed bonding on the surface of this white layer.
It should be noted that, described white resin composition also can be divided into be preserved containing thermoplastic resin and the host of Chinese white and aluminium hydroxide and organic solvent and the curing agent containing isocyanate compound, their mixing is used before use.
In addition, when preserving this white resin composition with unit dose form, as organic solvent, compounding acid amides series solvent.Its compounding amount is preferably 10 ~ 40 weight portions relative to this resin combination 100 weight portion.As such acid amides series solvent, such as, can enumerate: formamide, monomethyl foramide, dimethyl formamide, acetamide, monomethyl acetamide, dimethylacetylamide, single ethyl acetamide, diethyl acetamide, 1-METHYLPYRROLIDONE etc.
In addition, when using backboard of the present invention and manufacture solar module with the backboard that manufacture method of the present invention is formed, can be stacked in any one mode contacted with encapsulant in described 1st film or described 2nd film.That is, the mode that can contact with encapsulant with the surface of described 1st film is stacked, and the mode that also can contact with encapsulant with the surface of described 2nd film is stacked.
But, the composition with weatherability, moisture-proof etc. that compounding fluorine is such in described 1st film or the 2nd film, maybe by being coated on containing the composition of these compositions on the 1st film or the 2nd film or the film containing these compositions is fitted on the 1st film or the 2nd film, stacked in the mode that the surface of not carrying out the film of this process contacts with encapsulant.
the effect of invention
Backboard used for solar batteries of the present invention is laminated the mode that the white layer of the 1st film formed by polyester and the white resin composition solidification that makes to comprise Chinese white and aluminium hydroxide and the 2nd film that formed by polyester clamp described white layer with described 1st film and the 2nd film.Thus, described backboard not only can reflect from the visible ray the sunlight of the surface irradiation of solar module, and all right uv reflectance, therefore, can improve the generating efficiency of solar battery cell.
Specifically, in backboard used for solar batteries of the present invention, the Chinese white contained by white layer can reflect visible light, and then, by the aluminium hydroxide contained by this white layer and the combination being bonded in the polyester film in white layer, can uv reflectance.Therefore, backboard can reflect from both the visible ray of the surface irradiation of solar module and ultraviolet, effectively makes them turn back in solar battery cell.Particularly ultraviolet 99% for having the near ultraviolet ray (UV-A) of the wave-length coverage of 315 ~ 380nm, and backboard of the present invention can reflect this UV-A close to half.
In addition, solar cell backboard of the present invention can also reflect the sunlight of the back side illuminaton from solar module.Therefore, can prevent necessary above sunlight from inciding in solar module.Particularly there is easily generation by the problem of UV-induced deterioration in amorphous silicon type solar cell, and when using backboard of the present invention, necessary above ultraviolet can be prevented from solar module back surface incident, therefore, think the deterioration that can prevent such solar module.
Described backboard particularly can reflect and namely grow to most the ultraviolet of 400nm from the most serious wave-length coverage of EVA deterioration that makes of the back side illuminaton of solar module, therefore, can prevent the temperature of the sealing resin near the backboard that occurs from the back side of solar module and backboard from rising.Thus, the deterioration of EVA can be prevented.
And then as mentioned above, any surface of backboard used for solar batteries of the present invention overleaf and in surface can both reflect visible light and ultraviolet, therefore, can prevent the light deterioration of backboard self.
In addition, backboard used for solar batteries of the present invention is following structure, that is, the simple structure that the mode of the white layer of the white resin composition solidification of thermoplastic resin and Chinese white and aluminium hydroxide and isocyanate compound is stacked is made to comprise with the 1st film formed by polyester and the clamping of the 2nd film.Thus, without the need to various composition compounding in film or take time and energy like this via the stacked multiple films with various character of bonding agent and can solve above-mentioned problem.In addition, due in described white resin composition containing and the good thermoplastic resin of the adaptation of described 1st film and the 2nd film, therefore, the problem that the abutting edge that white layer and described 1st film and the 2nd film also not easily occur is peeled off.
In addition, easy bonding process can be implemented to the face contacted with described white layer of described 1st film or the 2nd film or described 1st film and the 2nd film.
Accompanying drawing explanation
Fig. 1 is the profile of the solar module of the backboard used for solar batteries using one embodiment of the present invention.
Fig. 2 is the figure of the reflectivity of 300nm ~ 1000nm when using ultra-violet and visible spectrophotometer to measure to irradiate from encapsulant side light to the backboard used for solar batteries manufactured in the backboard used for solar batteries of one embodiment of the present invention and comparative example.
Fig. 3 uses ultra-violet and visible spectrophotometer mensuration from the figure of the reflectivity of 300nm ~ 1000nm during backside illuminated light to the backboard used for solar batteries of one embodiment of the present invention.
description of reference numerals
10... solar module
20... backboard
1... surface protecting material
2... solar battery cell
3... encapsulant
4... the 1st film formed by polyester
5... white resin layer
6... the 2nd film formed by polyester
Embodiment
Below, one embodiment of the present invention is described in detail.
The 1st film that < is formed by polyester and the 2nd film >
As the polyester used in backboard used for solar batteries of the present invention, polyester, the such as PETG of general use, polybutylene terephthalate (PBT), poly terephthalic acid naphthalene diol ester (polynaphthalene terephthalate) or PEN etc. can be enumerated.Wherein, particularly preferably PETG and PEN is used.
It should be noted that, the 1st film formed by polyester and the 2nd film preferred component substantially identical.This is because, by making the shrinkage of the two that causes during heating consistent, provide the backboard that fail safe is high.Herein, for " substantially identical " in the present invention, refer to that the polyester component on the basis as above-mentioned 1st film and the 2nd film is identical.That is, as mentioned above, above-mentioned 1st film and the 2nd film due to the relation of thermal contraction, it is desirable that based on polyester component be identical (such as, the basic ingredient of above-mentioned 1st film and the 2nd film is all set to PETG etc.).But, as mentioned above, can compounding fluorine, additive etc. in above-mentioned 1st film or the 2nd film, therefore, composition can not identical situation also to there is (based on polyester beyond) of above-mentioned 1st film and the 2nd film.In this manual, such situation (such as additional fluorine in the 1st film, the situation of not additional fluorine in the 2nd film) is also contained in the situation of " substantially identical ".As mentioned above, fluorine can be attached in any one of the 1st film or the 2nd film, in this case, stacked in the mode that the surface of the film of not additional fluorine contacts with encapsulant.
The thickness of above-mentioned 1st film and the 2nd film adjusts in the mode that aggregate thickness when stacked described 1st film, white layer and the 2nd film is more than 125 μm.When particularly backboard used for solar batteries of the present invention being used for crystal type solar cell, its preferred aggregate thickness is 200 μm ~ 250 μm.
It should be noted that, above-mentioned 1st film and the 2nd film, except containing except polyester, containing additive etc., as such additive, can also can enumerate hydrolysis modifier, solid phase promoter, antioxidant, fire retardant etc.
And then, can compounding fluorine is such in described 1st film or the 2nd film the composition with weatherability, moisture-proof etc., maybe the composition containing these compositions be coated on the 1st film or the 2nd film or by the film containing these compositions be fitted on the 1st film or the 2nd film.Now, the mode contacted with encapsulant with the surface of not carrying out the film of this process is stacked.
< white resin composition >
The white resin composition used in backboard used for solar batteries of the present invention is by preparing at least one mixing in thermoplastic resin, Chinese white, aluminium hydroxide and isocyanate compound and the heat-curing resin used as required, curing catalysts, organic solvent and phenylethylene resin series and acrylic resin.
A) thermoplastic resin
In above-mentioned white resin composition, in order to give the adaptation, thermal endurance, weatherability, intensity etc. with described 1st film and the 2nd film, can compounding thermoplastic's resin.As such thermoplastic resin, such as, can enumerate: the polyester such as PETG, polybutylene terephthalate (PBT), polytrimethylene terephthalate, PEN, liquid crystal polyester; The polyolefin such as polyethylene, polypropylene, poly 1-butene, polybutene; Phenylethylene resin series, polyformaldehyde, polyamide, Merlon, polymethyl methacrylate, polyvinyl chloride, polyphenylene oxide, polyphenylene sulfide, polyimides, polyurethane, polyamidoimide, Polyetherimide, polysulfones, polyether sulfone, polyketone, polyether-ketone, polyether-ether-ketone, PEKK, polyarylate, polyethers nitrile, phenolic resins (such as phenol novolak type), phenoxy resin and their copolymer, modification body.These resins can be used alone as required or combine multiple use.
In the present invention, preferably use and there is the thermoplastic resin that hydroxyl or addition have hydroxyl.As such thermoplastic resin, as long as just can be not particularly limited to use for the oligomer with hydroxyl or polymer.Such as can enumerate: polyamide, polyester and there is the copolymer, phenolic resins, cresol resin etc. of the polyvinyl of hydroxyl or various acrylate, methacrylate.
As above-mentioned polyester, such as, can enumerate: NIPPORAN (registered trade mark) 800,1100,121,1004,136,141,4070 (manufacturing for NIPPON POLYURETHANE INDUSTRY CO.LTD. above) etc.
B) Chinese white
In above-mentioned white resin composition, in order to give above-mentioned backboard reflectivity (particularly visible ray), can compounding Chinese white.As such Chinese white, titanium oxide, zinc oxide, zinc sulphide, barium sulfate etc. can be enumerated.Wherein, preferential oxidation titanium, more preferably uses Titanium Dioxide Rutile Top grade.
As the Titanium Dioxide Rutile Top grade being used as above-mentioned Chinese white, such as, can enumerate: TIPAQUE (registered trade mark) R-550, TIPAQUE R-630, TIPAQUER-670, TIPAQUE R-680, TIPAQUE R-780, TIPAQUE R-820, TIPAQUE R-830, TIPAQUE R-850, TIPAQUE R-930, TIPAQUECR-50, TIPAQUE CR-57, TIPAQUE CR-58, TIPAQUE CR-60, TIPAQUE CR-63, TIPAQUE CR-67, TIPAQUE CR-80, TIPAQUECR-85, TIPAQUE CR-90, TIPAQUE CR-93, TIPAQUE CR-95, TIPAQUE CR-97, TIPAQUEUT771 (above for stone originates in industry (strain) manufacture), Ti-Pure (registered trade mark) R-100, Ti-Pure R-101, Ti-Pure R-102, Ti-PureR-103, Ti-Pure R-104, Ti-Pure R-105, Ti-Pure R-108, Ti-PureR-706, Ti-Pure R-900, Ti-Pure R-902, Ti-Pure R-960, Ti-PureR-931 (being that Du Pont's (strain) manufactures above), R-21, R-25, R-32, R-42, R-44, R-7E, R-5N, R-61N, R-62N, R-45M, R-49S, GTR-100, GTR-300, D-918, TCR-29, TCR-52, FTR-700 (being Sakai chemical industry (strain) manufacture above) etc.
In addition, as the anatase-type titanium oxide being used as above-mentioned Chinese white, such as can enumerate: TITON A-110, TITON A-190, TITON A-197, TITON TCA-123E, TITON SA-1, TITON SA-1L (being Sakai chemical industry (strain) manufacture above), TA-100, TA-200, TA-300, TA-400, TA-500, TP-2 (is Fuji Titanium Industry Co. above, Ltd. manufacture), TITANIX (registered trade mark) JA-1, TITANIX JA-3, TITANIX JA-4, TITANIXJA-5, TITANIX JA-C (above for Tayca Corporation manufactures), KA-10, KA-15, KA-20, KA-30 (is Titan Kogyo above, Ltd. manufacture), TIPAQUEA-100, TIPAQUE A-220, TIPAQUE W-10 (above for stone originates in industry (strain) manufacture) etc.
The compounding rate of such Chinese white is preferably 30 ~ 70 % by weight relative to white resin total composition.When this compounding rate is more than 70 % by weight, the dispersiveness of Chinese white is deteriorated, therefore not preferred.On the other hand, when this compounding rate is less than 30 % by weight, the reflectance reduction of white layer, can not reflected sunlight effectively, therefore not preferred.
C) aluminium hydroxide
In above-mentioned white resin composition, in order to give UV reflective, acid resistance and thermal diffusivity, can compounding aluminium hydroxide.As such aluminium hydroxide, known aluminium hydroxide can be used, such as, can enumerate: C-3005, C-301, CL-303 (above for Sumitomo Chemical (strain) manufactures), HIGILITE (registered trade mark) H-21, H-31, H-32, H-42, H-42M, H-43M (above is Showa electrician (strain) manufacture).
The compounding rate of such aluminium hydroxide is preferably 0.5 ~ 5 % by weight relative to white resin total composition.
D) isocyanate compound
In above-mentioned white resin composition, can compounding with thermoplastic resin or other composition in contained hydroxyl reaction and crosslinked isocyanate compound.By compounding isocyanate compound, white layer can be given with moisture-proof, thermal endurance, improve the adaptation of white layer and the 1st film and the 2nd film.Therefore, isocyanate compound preferably has multiple NCO in 1 molecule.
As such isocyanate compound, such as can enumerate: trimethylene diisocyanate, hexamethylene diisocyanate, di-2-ethylhexylphosphine oxide (4,1-phenylene)-vulcabond, 3-isocyanatomethyl-3, the vulcabond such as 5,5-trimethylcyclohexylisocyanate and XDI; The trimethylolpropane adduct of vulcabond; As the trimerical isocyanuric acid ester body of vulcabond; The biuret combination of vulcabond and polymeric diisocyanate etc.
The compounding amount of such isocyanate compound is preferably 0.03 ~ 10 weight portion relative to above-mentioned thermoplastic resin 100 weight portion.
E) heat-curing resin
In above-mentioned white resin composition, in order to give thermal endurance, acid resistance, insulating properties etc., can compounding heat-curing resin.As such heat-curing resin, such as, can enumerate: epoxy resin, phenolic resins, unsaturated acyl imide resin, cyanate ester resin, isocyanate resin, benzoxazine colophony, oxetane resin, amino resins, unsaturated polyester resin, allyl resin, dicyclopentadiene novolacs, organic siliconresin, cyanate resin and melmac, urea resin.Wherein, preferably epoxy resin is used.
As epoxy resin, the compound with more than 1 epoxy radicals can be enumerated.Wherein, the compound with more than 2 epoxy radicals is preferably used.As such epoxy resin, such as can enumerate: butyl glycidyl ether, phenyl glycidyl ether, the mono-epoxy compounds such as (methyl) glycidyl acrylate, bisphenol A type epoxy resin, bisphenol-s epoxy resin, bisphenol f type epoxy resin, phenol novolak type epoxy resin, cresol novolak type epoxy resin, alicyclic epoxy resin, trimethylolpropane polyglycidyl ether, phenyl-1, 3-diglycidyl ether, xenyl-4, 4 '-diglycidyl ether, 1, 6-hexanediol diglycidyl ether, the diglycidyl ether of ethylene glycol or propylene glycol, D-sorbite polyglycidyl ether, three (2, 3-glycidyl) isocyanuric acid ester, there is in 1 molecules such as triglycidyl group three (2-ethoxy) isocyanuric acid ester the compound etc. of more than 2 epoxy radicals.
The requirement that above-mentioned heat-curing resin improves according to the characteristic of white layer, can be used alone or combine multiple use.In addition, the compounding rate of such heat-curing resin is preferably 1 ~ 50 % by weight relative to white resin total composition.
F) curing catalysts
In above-mentioned white resin composition, in order to promote the hot curing of heat-curing resin, can compounding curing catalysts.As such curing catalysts, such as, can enumerate: the imdazole derivatives such as imidazoles, glyoxal ethyline, 2-ethyl imidazol(e), 2-ethyl-4-methylimidazole, 2-phenylimidazole, 4-phenylimidazole, 1-cyanoethyl-2-phenylimidazole, 1-(2-cyanoethyl)-2-ethyl-4-methylimidazole; Dicyandiamide, benzyl dimethyl amine, 4-(dimethylamino)-N, N-dimethyl benzylamine, 4-methoxyl group-N, N-dimethyl benzylamine, 4-methyl-N, the amines such as N-dimethyl benzylamine; The hydrazide compound such as adipic dihydrazide, sebacic dihydrazide; The phosphorus compounds such as triphenylphosphine; The metallic soap such as cobalt naphthenate, copper naphthenate etc.
In addition, can also be compounding also as guanamines, acetylguanamine, benzoguanamine, 2 that adaptation imparting agent works, 4-diaminourea-6-methacryloxyethyl-s-triazine, 2-vinyl-4,6-diaminourea-s-triazine, 2-vinyl-4, the Striazine derivatives such as 6-diaminourea-s-triazine isocyanuric acid adduct, 2,4-diaminourea-6-methacryloxyethyl-s-triazine isocyanuric acid adduct.
These materials can be used alone as required and also can combine multiple use.
The compounding amount of such curing catalysts is 0.05 ~ 10 weight portion relative to above-mentioned heat-curing resin 100 weight portion, is more preferably 0.1 ~ 3 weight portion.
G) organic solvent
In above-mentioned white resin composition, in order to modulation group compound or adjustment viscosity, can compounding organic solvent.As such organic solvent, such as, can enumerate: the ketone such as methyl ethyl ketone, cyclohexanone; Toluene, dimethylbenzene, durol etc. are aromatic hydrocarbon based; The glycol ethers such as cellosolve, methyl cellosolve, butyl cellosolve, carbitol, methyl carbitol, butyl carbitol, propylene glycol monomethyl ether, dipropylene glycol monomethyl ether, dipropylene glycol diethyl ether, Tripropylene glycol monomethyl Ether; The ester classes such as ethyl acetate, butyl acetate, butyl lactate, cellosolve acetate, butyl cellosolve acetate, carbitol acetate, butyl carbitol acetate, propylene glycol monomethyl ether acetate, dipropylene glycol monomethyl ether acetate, hexa-methylene two isocyanato-diethylene glycol ether acetate alone, propylene carbonate; The aliphatic hydrocarbon such as octane, decane; The petroleum solvents etc. such as benzinum, naphtha, solvent naphtha.These materials can be used alone and also can combine multiple use.
The compounding rate of such organic solvent is preferably less than 50 % by weight relative to white resin total composition.
In above-mentioned white resin composition, in order to give electrical characteristics and mechanical property, weatherability etc., can at least one in compounding phenylethylene resin series and acrylic resin.The compounding rate of these resins is preferably 1 ~ 50 % by weight relative to white resin total composition.
H) phenylethylene resin series
As above-mentioned phenylethylene resin series, such as, can enumerate: the homopolymers of styrenic monomers (styrene, vinyltoluene, AMS etc.) or copolymer; The copolymer of styrenic monomers and vinyl monomer (unsaturated nitrile, (methyl) acrylate, the α such as (methyl) acrylic acid, maleic anhydride etc. such as (methyl) acrylonitrile, β-monoolefine unsaturated carboxylic acid or the maleimide system such as acid anhydrides or its ester, maleimide, N-alkyl maleimide, N-phenylmaleimide monomer etc.); Styrenic graft copolymer, styrene block copolymer etc.These resins can be used alone and also can combine multiple use.
I) acrylic resin
As aforesaid propylene acid resin, make at least one monomer polymerization that is selected from acrylic acid, acrylate, methacrylate and acrylonitrile and the polymer obtained or copolymer.
In above-mentioned white resin composition, as required, the thickeners such as all right compounding fine particle silica, organobentonite, montmorillonite, the defoamer such as silicon-type, macromolecular, levelling agent, the additives such as silane coupler such as imidazoles system, thiazole system, triazole system.
Below, an execution mode of backboard used for solar batteries of the present invention is described.
First, the 1st film formed by polyester used in the backboard used for solar batteries of present embodiment and the 2nd film are such as formed according to following order.
That is, first, PEN melting is extruded into membranaceous, then, uses curtain coating drum to make its cooling curing, form unstretching film.Then, vitrification point Tg121 DEG C ~ (Tg+60) DEG C, along its length stretch more than 1 time or 2 times this unstretching film, the stretching ratio making it add up to is 3 ~ 6 times.And then, then be that it stretches Tg121 DEG C ~ (Tg+60) DEG C broad ways by the mode of 3 ~ 6 times with stretching ratio, make biaxial stretch-formed 1st film and the 2nd film of thickness 50 μm.In addition, as required, above-mentioned 1st film and the 2nd film can also be carried out heat treatment in 1 ~ 60 second at 180 DEG C ~ 230 DEG C.
In present embodiment, on the face of the formation white layer of described 1st film, the mode coating organic solvent being 30 μm with thickness is adjusted to the white resin composition comprising thermoplastic resin, Chinese white, aluminium hydroxide and isocyanate compound being suitable for the viscosity be coated with.Thereafter, at the temperature of 70 ~ 90 DEG C, make organic solvent volatile dry contained in said composition, form film.As the coating process of white resin composition, can be suitable for using silk screen print method, curtain-type rubbing method, spraying process, rolling method etc.In addition, in the volatile dry of organic solvent, use heated air circulation type drying oven, IR stove, hot plate, convection oven etc.Thereafter, at 80 DEG C ~ 200 DEG C, heat film, make its hot curing, thus, white layer can be formed on above-mentioned 1st film.
It should be noted that, can not white resin composition be coated on described 1st film as mentioned above, but use the dry film formed by said composition to form above-mentioned film.
For such dry film, such as, in the carrier film formed by PETG etc., be coated with white resin composition and dry, form resin bed, then the diaphragm such as stacked strippable polyethylene film, polypropylene screen on the resin layer.Specifically, by utilizing on a carrier film, blade coating machine, lip coating machine, comma coater, film are coated with machine to this resin bed, silk rod coating machine, micro-gravure coater etc. are coated with white resin composition and operation is dried and is formed as described above.
Then, peel off the diaphragm of this dry film, by above-mentioned resin bed and the 1st film overlap, use laminating machine etc. they to be fitted, thus on above-mentioned 1st film, form the film of resin bed.Then, as long as heated as described above by this film, just white layer can be formed on the 1st film.
Then, bonding or crimp above-mentioned 2nd film on the surface of this white layer, make the backboard used for solar batteries of present embodiment thus.As this adhering method, by using heated roller group etc., above-mentioned 2nd film thermo-compressed is carried out on the surface of above-mentioned white layer.
It should be noted that, as other execution mode, also can by forming white layer on above-mentioned 2nd film, on the surface of this white layer, above-mentioned 1st film of thermo-compressed, manufactures backboard used for solar batteries of the present invention.
In addition, in addition to the implementation described above, also can use and above-mentioned white resin composition be extruded sandwich laminating of extruding between above-mentioned 1st film and the 2nd film and stacked and manufacture backboard used for solar batteries of the present invention.
In addition, use Fig. 1, the solar module using the backboard used for solar batteries of one embodiment of the present invention to be formed is briefly described.
Such solar module 10 comprises the surface protecting material 1 and solar battery cell 2, the encapsulant 3 formed by EVA and backboard 20 that are formed by glass.And backboard 20 possesses the 1st film 4 and white resin layer 5 that are formed by polyester and the 2nd film 6 formed by polyester.And the mode clamping white resin layer 5 with the 1st film 4 and the 2nd film 6 is stacked.In Fig. 1, stacked in the mode that the surface of the 1st film 4 formed by polyester is bonding with encapsulant 3, but also can be stacked in the mode that the surface of the 2nd film 6 formed by polyester is bonding with encapsulant 3.Solar module 10 is that mode is above arranged with surface protecting material 1, and utilize the sunlight irradiated, solar battery cell 2 generates electricity.
Embodiment
Below, embodiments of the invention are described in detail.
< white resin composition >
By mixing following each composition, stir, preparation white resin composition.
NIPPORAN 136 (NIPPON POLYURETHANE INDUSTRY C0.LTD. manufactures) 100 weight portions (thermoplastic resin)
TIPAQUE CR-90 (stone originates in industry (strain) manufacture) 1000 weight portions (titanium oxide)
Aluminium hydroxide 20 weight portion
Takenate R600 (Mitsui Chemicals (strain) manufacture) 10 weight portions (isocyanate compound)
Propylene glycol monomethyl ether 20 weight portion (organic solvent)
EquamideB100 (the emerging product of bright dipping (strain) manufacture) 200 weight portions (organic solvent: acid amides series solvent)
AEROSIL 200 (manufacture of Nippon Aerosil Co., Ltd.) 20 weight portions (spherical silicon dioxide)
Styrene-maleic anhydride copolymer 600 weight portion (phenylethylene resin series)
BYK-A515 (Byk-chemie Japan Kk manufactures) 20 weight portions (defoamer)
Embodiment 1
In the one side of PEN (PEN) film (TEONEX that Teijin DuPont Films Japan Limited manufactures) of thickness 250 μm, pass through silk screen printing, white resin composition is printed in the mode that dry coating is 30 μm, by it 120 DEG C of heating 60 minutes, make its hot curing, make white layer.Thereafter, pen film (TEONEX that the Teijin DuPont Films Japan Limited manufactures) thermo-compressed of thickness 50 μm, on the surface of above-mentioned white layer, is made test film thus.
Embodiment 2
In the one side of the pen film (TEONEX that Teijin DuPont Films Japan Limited manufactures) of thickness 200 μm, pass through silk screen printing, white resin composition is printed in the mode that dry coating is 30 μm, by it 120 DEG C of heating 60 minutes, make its hot curing, make white layer.Thereafter, pen film (TEONEX that the Teijin DuPont Films Japan Limited manufactures) thermo-compressed of thickness 50 μm, on the surface of above-mentioned white layer, is made test film thus.
Comparative example
In the one side of the pen film (TEONEX that Teijin DuPont Films Japan Limited manufactures) of thickness 250 μm, pass through silk screen printing, white resin composition is printed in the mode that dry coating is 30 μm, by it 120 DEG C of heating 60 minutes, make its hot curing, make the test film with white layer.
< reflectivity >
Fitted the test film of EVA (about 450 μm) in (1) fit on the test film of embodiment 1 test film of EVA (about 450 μm), (2) on the test film of comparative example, use ultraviolet-uisible spectrophotometer (Japanese light splitting (strain) manufactures V-670ILN-725 type: with integrating sphere device) to measure the reflectivity of 300nm ~ 1000nm from surface (encapsulant side) respectively.The results are shown in Fig. 2.
In addition, for above-mentioned (1), use ultraviolet-uisible spectrophotometer (Japanese light splitting (strain) manufactures V-670 ILN-725 type: with integrating sphere device), measure the reflectivity of 300nm ~ 1000nm from the back side.The results are shown in Fig. 3.
< fracture strength, elongation at break >
For the test film of embodiment 2, measure fracture strength and elongation at break based on JIS standard (JIS-k7127), evaluate as follows.The results are shown in table 1.
[table 1]
| Embodiment 2 | |
| Fracture strength (mpa) | 198 |
| Elongation at break (%) | 100 |
< steam permeability >
For the test film of embodiment 2, measure steam permeability based on JIS-k7129, GB/T 1037.The results are shown in table 2.
[table 2]
| Embodiment 2 | |
| Steam permeability (g/m 2D) | 0.398 |
< shrinkage >
For the test film of embodiment 2, measure shrinkage based on JIS-c2151.The results are shown in table 3.
[table 3]
| Embodiment 2 | |
| Shrinkage (%) | 0.0 |
< insulation disruptive strength >
For the test film of embodiment 2, measure insulation breakdown intensity based on ASTM D-149-09.The results are shown in table 4.
[table 4]
| Embodiment 2 | |
| Insulation breakdown intensity (kV/mm) | 85.3 |
< partial discharge >
For the test film of embodiment 2, measure partial discharge based on IEC61730-2:2004.The results are shown in table 5.
[table 5]
| Embodiment 2 | |
| Partial discharge (vdc) | 1070 |
Above, from Fig. 2 and Fig. 3, backboard used for solar batteries of the present invention fully can reflect visible ray from the surface irradiation of solar module and ultraviolet.Therefore, this backboard can make these visible rays and ultraviolet turn back in solar battery cell effectively, can improve the generating efficiency of solar battery cell further.In addition, think, this backboard can also fully reflection from the visible ray of the back side illuminaton of solar module and ultraviolet, therefore, the light deterioration of backboard self can be prevented, meanwhile, can prevent necessary above sunlight from inciding in solar module, the deterioration of solar module can be prevented.
And then, can be clear and definite by table 1 ~ table 5, backboard used for solar batteries of the present invention fully meets the characteristic of backboard requirement, and, even if also sufficient weatherability and moisture-proof can be kept under being exposed to sunlight for a long time.
Claims (8)
1. a backboard used for solar batteries, it is characterized in that, possess the 1st film that formed by polyester and make containing there is the thermoplastic resin of hydroxyl and Chinese white and aluminium hydroxide and there is the white layer of white resin composition solidification of isocyanate compound of multiple NCO and the 2nd film that formed by polyester in 1 molecule, the mode clamping described white layer with described 1st film and the 2nd film is laminated, and wherein the compounding rate of aluminium hydroxide is 0.5 ~ 5 % by weight relative to white resin total composition.
2. backboard used for solar batteries according to claim 1, is characterized in that, described the 1st film that formed by polyester and the 2nd film are formed by least one in PEN and PETG.
3. backboard used for solar batteries according to claim 1 and 2, is characterized in that, the polyester component of described the 1st film that formed by polyester and the 2nd film is identical.
4. backboard used for solar batteries according to claim 1 and 2, is characterized in that, described Chinese white is titanium oxide.
5. backboard used for solar batteries according to claim 1 and 2, is characterized in that, the content of Chinese white contained in described white resin composition is 30 ~ 70 % by weight.
6. backboard used for solar batteries according to claim 1 and 2, is characterized in that, described white resin composition is also containing heat-curing resin and curing catalysts and organic solvent.
7. backboard used for solar batteries according to claim 1 and 2, is characterized in that, described white resin composition is also containing at least one in phenylethylene resin series and acrylic resin.
8. the manufacture method of a backboard used for solar batteries, it is characterized in that, comprise following operation: the white resin composition containing the thermoplastic resin and Chinese white and aluminium hydroxide with hydroxyl and the isocyanate compound in 1 molecule with multiple NCO at the coated on one side of the film formed by polyester is also dry, make its hot curing, thus form the operation of white layer; With bonding on the surface of this white layer or crimp the operation of the film that other is formed by polyester, wherein the compounding rate of aluminium hydroxide is 0.5 ~ 5 % by weight relative to white resin total composition.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
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| JP2011-201792 | 2011-09-15 | ||
| JP2011201792 | 2011-09-15 | ||
| JP2011227713A JP5831856B2 (en) | 2011-09-15 | 2011-10-17 | SOLAR CELL BACK SHEET AND METHOD FOR PRODUCING SOLAR CELL BACK SHEET |
| JP2011-227713 | 2011-10-17 |
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| CN102569440A CN102569440A (en) | 2012-07-11 |
| CN102569440B true CN102569440B (en) | 2015-01-14 |
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| CN104356849A (en) * | 2014-11-14 | 2015-02-18 | 无锡中洁能源技术有限公司 | Solar cell backboard coating and preparation method thereof |
| CN106206801B (en) * | 2016-08-11 | 2017-11-21 | 绍兴文理学院 | A kind of high-performance solar backboard |
| KR102162495B1 (en) * | 2018-03-28 | 2020-10-07 | 주식회사 엘지화학 | Resin composition |
| CN109244168B (en) * | 2018-09-28 | 2024-04-19 | 浙江中聚材料有限公司 | High heat dissipation type solar photovoltaic backboard and manufacturing equipment thereof |
| CN114133842A (en) * | 2021-12-06 | 2022-03-04 | 南通强生光电科技有限公司 | Coating for solar cell back panel and prepared solar cell back panel |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101273465A (en) * | 2005-09-30 | 2008-09-24 | 东丽株式会社 | Encapsulation film for photovoltaic module and photovoltaic module |
| CN102110728A (en) * | 2010-08-11 | 2011-06-29 | 宁波长阳科技有限公司 | Backing film of solar battery and preparation method thereof |
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| WO2010071032A1 (en) * | 2008-12-16 | 2010-06-24 | テクノポリマー株式会社 | Solar cell backsheet and solar cell module provided with same |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101273465A (en) * | 2005-09-30 | 2008-09-24 | 东丽株式会社 | Encapsulation film for photovoltaic module and photovoltaic module |
| CN102110728A (en) * | 2010-08-11 | 2011-06-29 | 宁波长阳科技有限公司 | Backing film of solar battery and preparation method thereof |
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