CN101615636A - Reduce the four-layer structure back board of solar cell of adhesive linkage - Google Patents
Reduce the four-layer structure back board of solar cell of adhesive linkage Download PDFInfo
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- CN101615636A CN101615636A CN 200910054994 CN200910054994A CN101615636A CN 101615636 A CN101615636 A CN 101615636A CN 200910054994 CN200910054994 CN 200910054994 CN 200910054994 A CN200910054994 A CN 200910054994A CN 101615636 A CN101615636 A CN 101615636A
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Abstract
The present invention relates to a kind of four-layer structure back board of solar cell that reduces adhesive linkage, comprise top-down weathering layer, first adhesive linkage, structure enhancement layer and bonding reflector, weathering layer is by the first adhesive linkage bonded structure enhancement layer, the structure enhancement layer bonding reflector of fitting, preferably, the structure enhancement layer is a polyester layer, bonding reflector is a polyolefin layer, the thickness of polyester layer is 40～400 μ m, the thickness of polyolefin layer is 4～400 μ m, and weathering layer is the fluorine material layer, and thickness is 4～40 μ m, first adhesive linkage is the polyurethane glue-line, a kind of in acrylate glue-line or the epoxy adhesive layer, thickness is 1 μ m～30 μ m, and solar cell backboard of the present invention has only four-layer structure, compares with five-layer structure commonly used, lacked the adhesive linkage between polyester layer and the polyolefin layer, saved cost greatly, also made the structure of solar cell backboard tightr, more durable, performance meets the requirement to backboard, and the solar energy industry is had very important meaning.
Description
Technical field
The present invention relates to technical field of solar batteries, particularly the solar cell backboard technical field specifically is meant a kind of four-layer structure back board of solar cell that reduces adhesive linkage.
Background technology
Because a large amount of uses of solar cell, each country, company have proposed many structures and have applied for many patents accordingly the backboard of solar cell.Structure relatively more commonly used at present is the TPT structure, wherein T refers to the Tedlar film of E.I.Du Pont Company, and composition is polyvinyl fluoride (PVF), and P refers to PETG (PET) film, therefore TPT refers to the PVF/PET/PVF structure, and is bonding with suitable bonding agent between three-layer thin-film.The typical production merchant of the backboard of TPT structure is the Isovolta company in Europe.The main effect of PVF film is weather-proof, and the whole world has only du pont company production, price height, supply monopolization.For saving cost, can substitute by the weaker plastic film of weatherability towards the PVF of solar battery sheet layer.So reason, the backboard (seeing patent application WO2004/091901A2) of TPE structure has been invented by the Madico company of the U.S..Wherein E refers to ethylene-vinyl acetate resin, is called for short EVA.The structure of TPE backboard is PVF/PET/EVA.The backboard that 3M company produces also is similar structure, uses THV (hexafluoropropylene (HFP)/tetrafluoroethylene (TFE)-vinylidene) film to be weathering layer, and structure is THV/PET/EVA, has also applied for patent (seeing patent application US2006/0280922A1).The patent of 3M attempts to cover fluoroplastics all except that PVF and all polyolefin.Polyolefinic definition has covered the plastics of all carbon-to-carbon structures, and kind is very many, and each plastics performance differs greatly.The fluoroplastics surface energy is low, except that PVF and THV are that other fluoroplastics are very difficult to bonding the easiest comparatively speaking bonding kind.So only can't realize structure except that THV/PET/EVA by its statement of applying for a patent.Other u s company is just attempting adopting ECTFE (ethene chlorotrifluoroethylene), ETFE (ethylene tetrafluoroethylene copolymer) as back veneer material, but does not also have commercial product.
The sandwich structure of above-mentioned various backboards is actual to be five-layer structure, all will use one deck adhesive bonds between described each functional layer.Bonding agent can use the bonding agent of polyurethane, acrylic acid or epoxies, also has company to use fluorine-containing bonding agent.Because bonding agent is wanted to stand 1000 to 3000 hours hot and humid senile experiment, thus very high to the requirement of bonding agent, also make bonding agent very expensive thus.Apply bonding agent simultaneously and need use coating process, complex procedures causes product rejection easily.
Be reported to and save cost or alternative PVF film, domestic company is arranged is that the fluorocarbon coating of main component is applied to the pet sheet face in order to fluoroplastics, vapors away the solvent that contains in the coating again and forms fluoroplastic layer.Lekai, Hebei company has applied for the patent of this method, the patent No. 200810079311.Can avoid using bonding agent between fluoroplastic layer and polyester layer with this way.But, brought the ply adhesion of each interlayer of fluoroplastics that is coated with several times not enough thus because fluorocarbon coating need repeatedly be coated with to avoid pin hole.Product is difficult to avoid the pin hole problem of coating in addition.More than 2 make such backboard up to the present quality be lower, can't become the market mainstream.
Summary of the invention
The objective of the invention is to have overcome above-mentioned shortcoming of the prior art, a kind of four-layer structure back board of solar cell that reduces adhesive linkage is provided, this solar cell backboard has only four-layer structure, compare with five-layer structure commonly used, lacked the adhesive linkage between polyester layer and the polyolefin layer, saved cost greatly, also make the structure of solar cell backboard tightr, more durable, performance meets the requirement to backboard, and the solar energy industry is had very important meaning.
To achieve these goals, the four-layer structure back board of solar cell of minimizing adhesive linkage of the present invention, be characterized in, comprise top-down weathering layer, first adhesive linkage, structure enhancement layer and bonding reflector, described weathering layer is by the bonding described structure enhancement layer of described first adhesive linkage, the described structure enhancement layer described bonding reflector of directly fitting.
Preferably, described structure enhancement layer is a polyester layer, and described bonding reflector is the polyolefin alloy layer.
More preferably, described polyester layer is PETG (PET) layer, PTT (PTT), polybutylene terephthalate (PBT) (PBT) layer or PEN (PEN) layer.Film can be biaxially oriented laminated film, monodirectional tension film or not stretch.Because (C-C) structure has certain similitude with polyolefinic carbon carbon structure, so both can fit together under appropriate condition all to contain carbon carbon in the molecular structure of polyester.But because polyester is the hypocrystalline plastics, the surface is difficult to bonding, so under normal circumstances polyolefin is difficult to fit together with it.Surface of polyester need be carried out corona (Corona), plasma (Plasma), flame (Flame) or primary coat PROCESS FOR TREATMENT such as (Primer) to increase surface energy.Can only adopt a kind of PROCESS FOR TREATMENT, also can successively adopt several PROCESS FOR TREATMENT to increase its surface energy.There is not bond layer between polyolefin alloy layer and the polyester layer.After surface of polyester had suitable surface energy, the polyolefin alloy of fusion is directly extruded curtain coating became the integrative-structure that closely links to each other to surface of polyester with it.
More preferably, the thickness of described polyester layer is 40～400 μ m.
More preferably, described polyolefin alloy layer is to contain ethene (CH2-CH2-) the plastic alloy alloy-layer of the resin of segment.
Further, described polyolefin alloy layer is that in polyethylene (PE), polypropylene (PP), ethylene-vinyl acetate resin (EVA), ethylene-propylene copolymer, ethylene-propylene acid butyl ester or methyl esters (EBA, EMA) resin and ethylene-acrylate-maleic anhydride (EMH) resin one or more are main material and inorganic Chinese white, uvioresistant stabilizer, and the plastic alloy alloy-layer that forms of thermo oxidative aging stabilizer, and wherein said main material accounts for 60% of described plastic alloy alloy-layer weight at least.
Especially more preferably, described inorganic Chinese white is titanium dioxide (TiO
2) or barium sulfate (BaSO
4).
Especially more preferably, described inorganic Chinese white accounts for 3%～10% of described plastic alloy alloy-layer weight.
More preferably, the thickness of described polyolefin alloy layer is 4～400 μ m.
Preferably, described weathering layer is the fluorine material layer.Fluorine material main component is fluoroplastics, can be the mixture of mixture, fluoroplastics and inorganic material of mixture, fluoroplastics and plasticizer of pure fluoroplastics, several fluoroplastics or the mixture of fluoroplastics and plasticizer and inorganic material.
More preferably, described fluoroplastics are selected from one or more of Kynoar (PVDF), polytetrafluoroethylene (PTFE), ethene chlorotrifluoroethylene (ECTFE), ethylene tetrafluoroethylene copolymer (ETFE), hexafluoropropylene (HFP)/tetrafluoroethylene (TFE)-vinylidene (THV), PVF (tetrafluoroethene or chlorotrifluoroethylene) and vinyl ether co-polymer (FEVE), perfluoroethylene-propylene (FEP) or tetrafluoroethene and perfluor n-propyl vinyl ether copolymer (PFA).
More preferably, in the described fluorine material content of fluoroplastics greater than 60%.
More preferably, described inorganic material is selected from one or more in the inorganic matter that structural formula is AxBy, and wherein A is silicon (Si), magnesium (Mg), titanium (Ti), zinc (Zn), aluminium (Al), molybdenum (Mo) or barium (Ba), and B is oxygen (O), sulphur (S) or sulfate radical (SO
4), x and y are selected from 1,2 or 3 respectively.Obviously, wherein Ax, By positive and negative charge mate.
More preferably, described plasticizer is polymethyl methacrylate (PMMA).
More preferably, the thickness of described fluorine material layer is 4～40 μ m.
Above-mentioned fluorine material layer is the fluorine material is made suitable thickness by casting machine or inflation film manufacturing machine a film.Film surface need be handled, and can be corona, plasma treatment or flame treatment.
Preferably, described first adhesive linkage is a kind of in polyurethane glue-line, acrylate glue-line or the epoxy adhesive layer.More preferably, be the polyurethane adhesive of two components.
Preferably, the thickness of described first adhesive linkage is 1 μ m～30 μ m.More preferably, thickness is 5 μ m～25 μ m.
Beneficial effect of the present invention is: the four-layer structure back board of solar cell of minimizing adhesive linkage of the present invention has only four-layer structure, compare with five-layer structure commonly used, lacked the adhesive linkage between polyester layer and the polyolefin layer, because adhesive linkage requires anti-1000 to 3000 hours wearing out, thereby cost an arm and a leg, reduce adhesive linkage, can save cost, also make the structure of solar cell backboard tightr, more durable.
Description of drawings
Fig. 1 is the structural representation of a specific embodiment of the present invention.
Embodiment
In order more to be expressly understood technology contents of the present invention, describe in detail especially exemplified by following examples.
See also shown in Figure 1, the four-layer structure back board of solar cell of minimizing adhesive linkage of the present invention comprises top-down weathering layer 1, first adhesive linkage 2, structure enhancement layer 3 and bonding reflector 4, described weathering layer 1 is by described first adhesive linkage, 2 bonding described structure enhancement layers 3, the described structure enhancement layer 3 described bonding reflector 4 of fitting.
Preferably, described structure enhancement layer 3 is polyester layers, and described bonding reflector 4 is polyolefin alloy layers.
More preferably, described polyester layer is PETG (PET) layer, PTT (PTT) layer, polybutylene terephthalate (PBT) (PBT) layer or PEN (PEN) layer.Film can be biaxially oriented laminated film, monodirectional tension film or not stretch.Thickness is 40～400 μ m.Can add inorganic Chinese white, also can not add.In specific embodiments of the invention 1, described polyester layer is the PET film of biaxial tension, and thickness is 250 μ m.Corona treatment is all used in PET film both sides, and the surface energy after the corona treatment reaches 42 dyne.
More preferably, described polyolefin layer is to contain ethene (CH2-CH2-) the plastic alloy alloy-layer of the resin of segment, can be polyethylene (PE), polypropylene (PP), ethylene-vinyl acetate resin (EVA) and ethene-propylene copolymer, ethylene-propylene acid butyl ester or methyl esters (EBA, EMA) one or more in resin and ethylene-acrylate-maleic anhydride (EMH) resin are main material and inorganic Chinese white, the uvioresistant stabilizer, and the plastic alloy alloy-layer of thermo oxidative aging stabilizer formation, thickness is 4～400 μ m, and wherein said main material accounts for 60% of described plastic alloy alloy-layer weight at least.Inorganic Chinese white is titanium dioxide (TiO
2) or barium sulfate (BaSO
4), account for 3%～10% of described plastic alloy alloy-layer weight.Main component at the polyolefin layer described in the specific embodiments of the invention 2 is PP, EVA, and ratio is 50: 10.Other contains hydrogenation butadiene-styrene rubber (SEBS) 34%, contains inorganic pigment titanium dioxide (TiO
2) 3%, and other age-inhibiting addition 3%.Thickness is 400 μ m.
Preferably, described weathering layer is the fluorine material layer, and thickness is 4～40 μ m.The mixture of the mixture of mixture, fluoroplastics and the inorganic material of mixture, fluoroplastics and plasticizer that described fluorine material layer can be pure fluoroplastics, several fluoroplastics or fluoroplastics and plasticizer and inorganic material.Described fluorine material can be selected from one or more in polyvinyl fluoride Kynoar (PVDF), polytetrafluoroethylene (PTFE), ethene chlorotrifluoroethylene (ECTFE), ethylene tetrafluoroethylene copolymer (ETFE), hexafluoropropylene (HFP)/tetrafluoroethylene (TFE)-vinylidene (THV), PVF and vinyl ether co-polymer (FEVE), perfluoroethylene-propylene (FEP) or tetrafluoroethene and the perfluor n-propyl vinyl ether copolymer (PFA).More preferably, the content of fluoroplastics in this layer surpasses 60%.Described plasticizer is polymethyl methacrylate (PMMA).Described inorganic material is selected from one or more in the inorganic matter that structural formula is AxBy, and wherein A is silicon (Si), magnesium (Mg), titanium (Ti), zinc (Zn), aluminium (Al), molybdenum (Mo) or barium (Ba), and B is oxygen (O), sulphur (S) or sulfate radical (SO
4), x and y are selected from 1,2 or 3 respectively.Obviously, wherein Ax, By positive and negative charge mate.In specific embodiments of the invention 2, described fluorine material layer is Kynoar (PVDF), content 60%.Plasticizer uses polymethyl methacrylate, and content is 30%.Other composition is titanium dioxide (TiO
2) 8% and age resister 2%.Thickness 4 μ m.
Preferably, described first adhesive linkage is a kind of in polyurethane glue-line, acrylate glue-line or the epoxy adhesive layer.Thickness is 1 μ m～30 μ m.More preferably, thickness is 5 μ m～25 μ m.In specific embodiments of the invention 3, described first adhesive linkage is a polyurethane two-component glue, and thickness is 10 μ m.
In above-mentioned 3 specific embodiments of the present invention, actual (real) thickness of each layer and the composition of each layer are as shown in the table:
In the above-mentioned specific embodiment, actual measurement adhesive strength between polyolefin alloy layer and the polyester layer is greater than the breakdown strength of material itself, and after under 85% humidity and the 85 ℃ of conditions aging 1000 hours, find no cracking phenomena, so fluorine material alloys layer and polyester layer are bonding good, the applying effect of polyolefin layer and polyester layer two interlayers is very good.
The present invention is direct and polyester layer applying with the polyolefin alloy layer, has reduced one deck bonding agent, thereby provided cost savings greatly, because the direct applying of polyester layer and polyolefin layer makes back board structure tightr, weatherability also increases simultaneously.
To sum up, the four-layer structure back board of solar cell of minimizing adhesive linkage of the present invention is compared with five-layer structure commonly used, lacked the adhesive linkage between polyester layer and the polyolefin layer, saved cost greatly, also make the structure of solar cell backboard tightr, more durable, performance meets the requirement to backboard, and the solar energy industry is had very important meaning.
In this specification, the present invention is described with reference to its certain embodiments.But, still can make various modifications and conversion obviously and not deviate from the spirit and scope of the present invention.Therefore, specification and accompanying drawing are regarded in an illustrative, rather than a restrictive.
Claims (17)
1. four-layer structure back board of solar cell that reduces adhesive linkage, it is characterized in that, comprise top-down weathering layer, first adhesive linkage, structure enhancement layer and bonding reflector, described weathering layer is by the bonding described structure enhancement layer of described first adhesive linkage, the described structure enhancement layer described bonding reflector of fitting.
2. the four-layer structure back board of solar cell of minimizing adhesive linkage according to claim 1 is characterized in that, described structure enhancement layer is a polyester layer, and described bonding reflector is a polyolefin layer.
3. the four-layer structure back board of solar cell of minimizing adhesive linkage according to claim 2, it is characterized in that described polyester layer is PETG layer, PTT, polybutylene terephthalate (PBT) layer or PEN layer.
4. the four-layer structure back board of solar cell of minimizing adhesive linkage according to claim 2 is characterized in that, the thickness of described polyester layer is 40～400 μ m.
5. the four-layer structure back board of solar cell of minimizing adhesive linkage according to claim 2 is characterized in that, described polyolefin layer is the plastic alloy alloy-layer that contains the resin of ethene segment.
6. the four-layer structure back board of solar cell of minimizing adhesive linkage according to claim 6, it is characterized in that, described polyolefin layer is one or more the plastic alloy alloy-layers for main material and inorganic Chinese white, uvioresistant stabilizer and the formation of thermo oxidative aging stabilizer in polyethylene, polypropylene, ethylene-vinyl acetate resin, ethylene-propylene copolymer, ethylene-propylene acid butyl ester or methyl esters resin and the ethylene-acrylate-maleic anhydride resin, and wherein said main material accounts for 60% of described plastic alloy alloy-layer weight at least.
7. the four-layer structure back board of solar cell of minimizing adhesive linkage according to claim 7 is characterized in that, described inorganic Chinese white is titanium dioxide or barium sulfate.
8. the four-layer structure back board of solar cell of minimizing adhesive linkage according to claim 7 is characterized in that, described inorganic Chinese white accounts for 3%～10% of described plastic alloy alloy-layer weight.
9. the four-layer structure back board of solar cell of minimizing adhesive linkage according to claim 2 is characterized in that, the thickness of described polyolefin layer is 4～400 μ m.
10. the four-layer structure back board of solar cell of minimizing adhesive linkage according to claim 1, it is characterized in that, described weathering layer is the fluorine material layer, the composition of the fluorine material in the described fluorine material layer mainly is fluoroplastics, the mixture of mixture, fluoroplastics and the inorganic material of mixture, fluoroplastics and plasticizer that described fluorine material is pure fluoroplastics, several fluoroplastics or fluoroplastics and plasticizer and inorganic material.
11. the four-layer structure back board of solar cell of minimizing adhesive linkage according to claim 11, it is characterized in that described fluorine material is selected from one or more in Kynoar, polytetrafluoroethylene, ethene chlorotrifluoroethylene, ethylene tetrafluoroethylene copolymer, hexafluoropropylene (HFP)/tetrafluoroethylene (TFE)-vinylidene, PVF (tetrafluoroethene or chlorotrifluoroethylene) and vinyl ether co-polymer, perfluoroethylene-propylene or tetrafluoroethene and the perfluor n-propyl vinyl ether copolymer.
12. the four-layer structure back board of solar cell of minimizing adhesive linkage according to claim 11 is characterized in that, described fluoroplastics account for more than 60% of described fluorine material total weight.
13. the four-layer structure back board of solar cell of minimizing adhesive linkage according to claim 11, it is characterized in that, described inorganic material is selected from one or more in the inorganic matter that structural formula is AxBy, wherein A is silicon, magnesium, titanium, zinc, aluminium, molybdenum or barium, B is oxygen, sulphur or sulfate radical, and x and y are selected from 1,2 or 3 respectively.
14. the four-layer structure back board of solar cell of minimizing adhesive linkage according to claim 11 is characterized in that, described plasticizer is a polymethyl methacrylate.
15. the four-layer structure back board of solar cell of minimizing adhesive linkage according to claim 11 is characterized in that, the thickness of described fluorine material layer is 4～40 μ m.
16. the four-layer structure back board of solar cell of minimizing adhesive linkage according to claim 1 is characterized in that, described first adhesive linkage is a kind of in polyurethane glue-line, acrylate glue-line or the epoxy adhesive layer.
17. the four-layer structure back board of solar cell of minimizing adhesive linkage according to claim 1 is characterized in that, the thickness of described first adhesive linkage is 1 μ m～30 μ m.
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| CN102115642A (en) * | 2010-12-31 | 2011-07-06 | 广州鹿山新材料股份有限公司 | EVA (ethylene vinyl-acetate copolymer) adhesive film capable of simplifying packaging structure of solar battery |
| CN102408649A (en) * | 2011-09-21 | 2012-04-11 | 苏州禾昌聚合材料股份有限公司 | Modified polyvinylidene fluoride material used for solar cell protective films and preparation method thereof |
| CN102522439A (en) * | 2011-12-31 | 2012-06-27 | 苏州幸福新能源科技有限责任公司 | Insulating back plate for novel solar photovoltaic battery and preparation method thereof |
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| CN102569457A (en) * | 2012-01-05 | 2012-07-11 | 苏州幸福新能源科技有限责任公司 | Novel insulating back plate for solar photovoltaic cell |
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| CN105237855A (en) * | 2015-10-29 | 2016-01-13 | 乐凯胶片股份有限公司 | Solar cell backplane |
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| CN102555370A (en) * | 2010-12-31 | 2012-07-11 | 苏州中来光伏新材股份有限公司 | Non-fluorinated high-weather-proof high-cohesiveness solar cell back membrane and processing technology |
| CN102115642A (en) * | 2010-12-31 | 2011-07-06 | 广州鹿山新材料股份有限公司 | EVA (ethylene vinyl-acetate copolymer) adhesive film capable of simplifying packaging structure of solar battery |
| CN102555370B (en) * | 2010-12-31 | 2015-04-22 | 苏州中来光伏新材股份有限公司 | Non-fluorinated high-weather-proof high-cohesiveness solar cell back membrane and processing technology |
| CN102115642B (en) * | 2010-12-31 | 2013-01-16 | 广州鹿山新材料股份有限公司 | EVA (ethylene vinyl-acetate copolymer) adhesive film capable of simplifying packaging structure of solar battery |
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| CN102569463A (en) * | 2012-02-10 | 2012-07-11 | 无锡中洁能源技术有限公司 | Back film for back contact type solar cell and production process thereof |
| CN102653154B (en) * | 2012-03-19 | 2014-08-13 | 杭州福膜新材料科技有限公司 | Self-adhesive polyvinylidene fluoride thin film and solar photovoltaic cell backsheet prepared by using same |
| CN102653154A (en) * | 2012-03-19 | 2012-09-05 | 杭州福膜新材料科技有限公司 | Self-adhesive polyvinylidene fluoride thin film and solar photovoltaic cell backsheet prepared by using same |
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Application publication date: 20091230 |