CN103346182B - A kind of back film of solar cell and production technology thereof - Google Patents
A kind of back film of solar cell and production technology thereof Download PDFInfo
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- CN103346182B CN103346182B CN201310229302.1A CN201310229302A CN103346182B CN 103346182 B CN103346182 B CN 103346182B CN 201310229302 A CN201310229302 A CN 201310229302A CN 103346182 B CN103346182 B CN 103346182B
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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
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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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
Abstract
A kind of back film of solar cell, comprise the PET film matrix of thickness 100 ~ 350 μm, described matrix coated on both sides has the fluoropolymer coating of 15 ~ 30 μm, be coated on PET film matrix after the mixed emulsion that fluoropolymer coating obtains after being mixed by proportioning by each raw material components is swelling at 80 ~ 200 DEG C and obtain, the raw material of described fluoropolymer coating comprises the component of following quality proportioning: polyester PET powder, fluorine resin, solvent, crosslinking agent, filler, ethylene glycol; Polyester PET powder is the polyester PET powder that the sediment dissolving gained in phenol-carbon tetrachloride mixed solvent is less than 25 microns through the particle diameter that pulverizing is made; Fluorine resin is fluoro containing polymers resin, the solar battery back film that the invention provides a kind of easy processing, tear-resistant, electrical insulation properties and have excellent weather resistance.
Description
Technical field
The invention belongs to the encapsulation technology field of semiconductor device, be specifically related to back film of solar cell and production technology thereof.
Background technology
Solar battery back film is the indispensable part of solar cell, is mainly used in the encapsulation of solar cell, is that the protective material of panel backside is for supporting and fixed solar battery.There is insulation (electrical breakdown withstand), ageing-resistant, resistance against weather influences and the characteristic such as corrosion-resistant.
At present, solar energy back film is divided into compound and application type, compound backboard membrane mainly contains TPT, TPE and FPF backboard membrane, independently film is hot-forming by the bonding of glue with Tedlar/PET/Tedlar tri-layers for TPT, wherein T represents polyvinyl fluoride PVF (Polyvinylfluoride), thickness is at about 37 μm, this layer is used as the main layer of solar cell package material, its effect is weather, uvioresistant, ageing-resistant and not photosensitive etc., P represents PET film, thickness is generally 250 μm, Main Function is that aqueous vapor intercepts and electric insulation, there is dimensionally stable easily process and tear-resistant advantage, TPE backboard membrane (Tedlar/PET/EVA) is at PET basement membrane one side compound Tedlar fluorine film, another side compound EVA adhesive film or polyolefin film, but the ultra-violet resistance of TPE and heatproof oxidation performance poor, the useful life of photovoltaic module can be affected.FPF backboard membrane is at PET two sides compound FFC fluorine film, has good electrical performance but combination property is poor.But TPT adopts heat pressing process easily to cause film bonding strength between layers inadequate, can not adapt to the requirement of photovoltaic cell component producer.Application type is, by suitable technique, fluoro-containing coating is coated on PET membrane surface, performance and TPT similar, cost has greater advantage, but the quality problems such as low, the easy husky hole of appearance of coating layer adhesive force, the wet weak effect of resistance, the class of product is lower, fails to be applied to high-grade crystal silicon solar batteries assembly.
Chinese invention patent CN101290950(publication date is on February 2nd, 2011) a kind of solar battery back film and production technology thereof are provided, this notacoria comprises the PET film matrix of thickness 100 ~ 350 Μ M, described matrix coated on both sides has the fluoropolymer coating of 15 ~ 30 Μ M, wherein one side fluoropolymer coating is coated with the adhesive phase of 0.5 ~ 5 Μ M; The mixed emulsion obtained through sanded after described fluoropolymer coating is mixed by proportioning by each raw material components is directly coated on PET film matrix and obtains, the raw material of described fluoropolymer coating comprises the component of following quality proportioning: fluoro-containing coating 30 ~ 55%, solvent 20 ~ 40%, crosslinking agent and curing agent 2 ~ 6%, filler 15 ~ 40%.This invention makes the raising of notacoria bond strength between layers by adhesive phase, ageing-resistant, the weather-resistant property aspect of product improve, multi-layer structure design improves insulating properties and the vapour resistant permeability of notacoria, but this scheme of the invention manufacturing process is complicated, need repeatedly to apply, length consuming time, and in actual production, quality is wayward; After fluoropolymer coating solidification, wherein the content of fluoropolymer accounts for about 80%.
Summary of the invention
The defect that prior art processes is complicated in order to solve, gas permeability and tearing strength can not meet photovoltaic cell requirement, the solar battery back film that the invention provides a kind of easy processing, tear-resistant, electrical insulation properties and have excellent weather resistance.
For above technical problem, the corresponding technical solution scheme of the present invention is:
A kind of back film of solar cell, comprise the PET film matrix of thickness 100 ~ 350 μm, described matrix coated on both sides has the fluoropolymer coating of 15 ~ 30 μm, be coated on PET film matrix after the mixed emulsion that described fluoropolymer coating obtains after being mixed by proportioning by each raw material components is swelling at 80 ~ 200 DEG C and obtain, the raw material of described fluoropolymer coating comprises the component of following quality proportioning:
Polyester PET powder 6 ~ 10%
Fluorine resin 30 ~ 55%
Solvent 10 ~ 20%
Crosslinking agent 2 ~ 6%
Filler 10 ~ 30%
Ethylene glycol 5 ~ 8%;
Described polyester PET powder is the polyester PET powder that the sediment dissolving gained in phenol-carbon tetrachloride mixed solvent is less than 25 microns through the particle diameter that pulverizing is made;
Described fluorine resin is fluoro containing polymers resin, described fluoro containing polymers resin is one or more mixing following: polyvinyl fluoride PVF (Polyvinylfluorid), Kynoar PVDF (Polyvinylidenefluoride), polytetrafluoroethylene PTFE (Polytetrafluoroethylene), perfluoroethylene-propylene, fluorubber (PFA), chlorotrifluoroethylene-alkyl vinyl ether co-polymer and other fluorine resins, and fluoro containing polymers resin mainly plays film forming and cross-linked polymeric in the raw material of fluoropolymer coating;
Described solvent is one or more mixing following: dimethylbenzene, n-butanol, butyl acetate, propylene glycol monomethyl ether, monobutyl ether acetate, methyl pyrrolidone;
Main and the fluoro-containing coating of described CROSSLINKERSCrosslinkers plays crosslinking curing, and crosslinking agent is one or more mixing following: mylar, many isocyanide esters, amino resins, epoxy resin, Lauxite, gamma-butyrolacton;
Described filler is in order to strengthen the intensity of fluoropolymer coating.Filler of the present invention is one or more mixing following: titanium dioxide, silicon dioxide, ultra-fine barium sulfate, precipitated calcium carbonate;
Further, consider the specific requirement of client to outward appearance and color and luster, the present invention can add various pigment in the raw material of fluoropolymer coating, the raw material of described fluoropolymer coating also comprises pigment, described pigment comprises carbon black, cobalt blue, chrome yellow, titanium dioxide, iron oxide, and the raw material of described fluoropolymer coating is made up of the component of following quality proportioning:
Polyester PET powder 6 ~ 10%
Fluorine resin 30 ~ 55%
Solvent 10 ~ 20%
Crosslinking agent 2 ~ 6%
Filler 10 ~ 30%
Ethylene glycol 5 ~ 8%
Pigment 0.5 ~ 2%.
Described solvent is preferably propylene glycol monomethyl ether.
Described fluorine resin is preferably Kynoar and polytetrafluoroethylene, and the insulation property as body material are better than polyvinyl fluoride.
Present invention also offers the production technology of back film of solar cell, it is characterized in that the production technology of described solar battery back film comprises the steps:
(1) PET film matrix is carried out carrying out sanded after each raw material components of described fluoropolymer coating mixes by proportioning by preliminary treatment (2), form good leveling property, fineness and be less than 25 microns, the mixed emulsion of modest viscosity, directly be coated on pretreated PET film matrix, be heated to 80 ~ 200 DEG C of bakings swelling, fluoropolymer coating adds hankers flowing to PET film matrix, obtains the fluoropolymer coating of 15 ~ 30 μm after being heating and curing.
Before preparing notacoria, first to carry out preliminary treatment to PET film matrix, preliminary treatment can comprise deoils and destatics process: first carry out surface degreasing process with surfactant to PET film matrix, then cleans up with the activating agent of deionized water by matrix surface.Matrix after oil removal treatment is carried out destaticing process.Destatic the method that can adopt static bruss.Generally speaking, those skilled in the art according to the surface appearance of matrix and actual process needs, can select pretreatment mode and step, or simplify pre-treatment step or omit voluntarily.
In above-mentioned steps (2), those skilled in the art can select each raw material components and the consumption proportion of fluoropolymer coating according to actual needs, as whether added pigment and/or auxiliary agent etc.After raw material mixes, need to carry out sanded form good leveling property, fineness is less than 25 microns, the mixed emulsion of modest viscosity, can adopt fineness scraper plate instrument to detect fineness and levelability, the means such as viscosity apparatus, ESEM can also be adopted to carry out check processing effect in sand grinding process.The general control sand milling time is 0.5 ~ 1 hour.
The painting method that step (2) prepares fluoropolymer coating has silk screen printing, spraying, roller coating, blade coating, showering etc.
The coating of this fluoropolymer coating can once complete on two sides, or applies another side again after completing one side.Need to be heated to 80 ~ 200 DEG C of bakings swelling after having applied, film-forming.
In the present patent application fluoropolymer coating, PET powder is being heated at 80-200 DEG C, PET powder is swelling in the alcohols solvents such as ethylene glycol, PET film matrix is in solvent swelling state equally, be in PET powder and the PET film matrix surface generation graft polymerization reaction of molten state, make coating and PET film matrix reach very strong inter-layer bonding force.PET due to solvent swelling state is easy to flow to PET film matrix surface, and finally when curing of coatings film forming, coating surface is formed basic based on the film of fluorine material, has stronger inter-layer bonding force, thus makes notacoria have good weatherability.Invention applies swelling grafting principle, PET powder presents gel because of swelling, and play physical crosslinking effect, macromolecular chain is by bulk migration of crawling, with combination interface district close contact, thus active chain end is made promptly to be diffused into PET film matrix and to combine closely with it.
Compared to existing technology, the back film of solar cell beneficial effect of the present patent application is:
1. in the present invention, the fluid formed containing PET micro particles, fluorine resin, solvent, crosslinking agent, sweller, filler etc., through oil removing with after destaticing process, is directly coated in base film surface by PET base film after swelling.PET due to solvent swelling state is easy to flow to PET film matrix surface, finally when curing of coatings film forming, produce strong combination between the PET micro particles of coating inner surface and PET matrix, thus make to reach very strong inter-layer bonding force between fluoropolymer coating and PET film matrix.
2. fluoropolymer coating emulsion is flowing in PET film matrix process, and due to separation, deposition, most crosslinking agent, sweller, filler adheres are in PET film matrix.After baking-curing, in fluoropolymer coated film, the content of fluoropolymer can reach 95%.And using the fluoropolymer coated film that traditional coating processes makes, the content of fluoropolymer is only 80%.The raising of fluoropolymer content, makes notacoria have more excellent ageing-resistant performance, comprises stronger vapour resistant infiltration and UV resistant performance.
3. due to the present invention adopt direct application, the method for overall film forming prepares notacoria, apply disposable completing, therefore manufacturing process is easy, consuming time short, and quality is easy to control in process of production.
Embodiment
Embodiment 1
With surfactant, the PET film surface that thickness is 150 μm is processed, then use washed with de-ionized water, to remove the greasy dirt of film surface, for subsequent use after drying.
PET section is dissolved postprecipitation at phenol-carbon tetrachloride, and sediment is crushed to the Powdered PET that particle diameter is less than 25 microns in pulverizer.
The present embodiment fluorine resin is polyvinyl fluoride; Solvent is propylene glycol monomethyl ether; Crosslinking agent is gamma-butyrolacton.
The weight ratio of fluorine resin, PET powder, solvent, crosslinking agent, titanium dioxide (TiO2) and ethylene glycol being pressed 49: 10: 10: 6: 20: 5 coordinates, Homogeneous phase mixing in bead sand mill, sand milling 0.5 hour, form good leveling property, fineness and be less than 25 microns, the mixed solution of modest viscosity, then be heated to 180 degrees Celsius, adopt method application one deck fluoropolymer coating in the PET film through adhesive treatment of roller coating.Baking through 10 minutes at the temperature of 180 degrees Celsius is swelling, and the thickness of this film is about 20 μm.
The gross thickness of this notacoria is about 195 μm.
Adopt surface sweeping Electronic Speculum (SEM) technology to detect this notacoria surface, the densification very of notacoria surface, smooth, TiO2 filler distribution is even, and particle diameter is about 100-200nm (nanometer).
This product has extraordinary weatherability and electrical insulation properties, can combination extraordinary with EVA glue, can be widely used in the encapsulation of various solar cell.
Embodiment 2
The present embodiment fluorine resin is Kynoar.Solvent is propylene glycol monomethyl ether; Crosslinking agent is Lauxite.
The weight ratio of fluorine resin, PET powder, solvent, crosslinking agent, silicon dioxide and ethylene glycol being pressed 50: 8: 10: 6: 18: 8 coordinates, Homogeneous phase mixing in bead sand mill, sand milling 1 hour, form good leveling property, fineness and be less than 25 microns, the mixed solution of modest viscosity, then be heated to 80 degrees Celsius, adopt the method for roller coating in the upper application one deck PVDF coating of clean PET film (thickness is about 150 μm).Through the baking of 15 minutes at the temperature of 180 degrees Celsius, form PVDF thin film after the solvent evaporates in PVDF coating, the thickness of this film is about 20 μm.
Embodiment 3
The present embodiment fluorine resin is polytetrafluoroethylene.Solvent is methyl pyrrolidone; Crosslinking agent is many isocyanide esters.
By the method for corona, surface is carried out to the PET film that thickness is 120 μm and goes Electrostatic Treatment,
Fluorine resin, PET powder, solvent, crosslinking agent, silicon dioxide and ethylene glycol coordinate by the weight ratio of 30: 10: 20: 6: 30: 4, Homogeneous phase mixing in bead sand mill, sand milling 1 hour, form good leveling property, fineness and be less than 25 microns, the mixed solution of modest viscosity, then be heated to 180 degrees Celsius, adopt the method for roller coating in the upper application one deck PTFE coating of the PET film (thickness is about 124 μm) being coated with EVA glue.Through the baking of 10 minutes at the temperature of 150 degrees Celsius, form film after the solvent evaporates in PTFE coating, the thickness of this film is about 20 μm.
Embodiment 4
The present embodiment fluorine resin is perfluoroethylene-propylene.Solvent is monobutyl ether acetate; Crosslinking agent is amino resins, and pigment is carbon black.
By the method for corona, surface is carried out to the PET film matrix that thickness is 100 μm and go Electrostatic Treatment, matrix coated on both sides has the fluoropolymer coating of 15 μm, fluoropolymer coating be after being mixed by proportioning by each raw material components the mixed emulsion that obtains swelling at 150 DEG C after apply on PET film matrix again, the raw material of fluoropolymer coating comprises the component of following quality proportioning:
Polyester PET powder, fluorine resin, solvent, crosslinking agent, filler, ethylene glycol, pigment, weight proportion is 10:55:15:15:3:2.
Embodiment 5
The present embodiment fluorine resin is the mixing according to 4:1 of polyvinyl fluoride and fluorubber, and solvent is butyl acetate; Crosslinking agent is gamma-butyrolacton.
By the method for corona, surface is carried out to the PET film matrix that thickness is 350 μm and go Electrostatic Treatment, matrix coated on both sides has the fluoropolymer coating of 20 μm, fluoropolymer coating be after being mixed by proportioning by each raw material components the mixed emulsion that obtains swelling at 80 ~ 200 DEG C after apply on PET film matrix again, the raw material of fluoropolymer coating comprises the component of following quality proportioning:
Polyester PET powder, fluorine resin, solvent, crosslinking agent, filler, ethylene glycol, weight proportion is 6:40:20:6:23:5.
Experimental example
Above-described embodiment 1-5 is done following test
(1) inter-layer bonding force (interlaminar strength) between fluorine rete and PET film
Detection method: " soft composite plastics material disbonded test method " (GB8808-88)
Test condition: sample is cut out the size for width 15.0mm, length 200mm, place more than 4h in the environment of temperature 23 DEG C, relative humidity 50%.Along specimen length direction by composite bed and base material strip off 50mm in advance, being stripped part must not have obvious damage.Sample is carried out T-shaped stripping with the speed of 300mm/min, measures the Average peel force of composite bed and base material.
(2) the vapor water barriers performance of notacoria
Detection method: " plastic film and sheet material water vapor permeability test method (cup type method) " (GB/T1037-1988) test condition: temperature 38 ± 0.6 DEG C, under relative humidity 90 ± 2% condition, sample both sides keep certain steam pressure reduction, test the steam vapour amount through sample, calculate moisture-vapor transmission.
(3) the UV resistant performance of notacoria
Detection method: " plastics yellow colour index test method " (HG/T3862-2006)
Test condition: at 85 DEG C, uses UVA340 to irradiate 1500 hours, mensuration notacoria Yellow varying index (Yellownessdifference,
△yI).
Notacoria performance comparison:
Comparative example makes according to the method for Chinese invention patent CN101290950.
In sum, after those of ordinary skill in the art reads file of the present invention, make other various corresponding conversion scheme according to technical scheme of the present invention and technical conceive without the need to creative mental labour, all belong to the scope that the present invention protects.
Claims (5)
1. a back film of solar cell, comprise the PET film matrix of thickness 100 ~ 350 μm, described matrix coated on both sides has the fluoropolymer coating of 15 ~ 30 μm, be coated on PET film matrix after the mixed emulsion that described fluoropolymer coating obtains after being mixed by proportioning by each raw material components is swelling at 80 ~ 200 DEG C and obtain, the raw material of described fluoropolymer coating comprises the component of following quality proportioning:
Polyester PET powder 6 ~ 10%
Fluorine resin 30 ~ 55%
Solvent 10 ~ 20%
Crosslinking agent 2 ~ 6%
Filler 10 ~ 30%
Ethylene glycol 5 ~ 8%;
Described polyester PET powder is the polyester PET powder that the sediment dissolving gained in phenol-carbon tetrachloride mixed solvent is less than 25 microns through the particle diameter that pulverizing is made;
Described fluorine resin is fluoro containing polymers resin, and described fluoro containing polymers resin is one or more mixing following: polyvinyl fluoride, Kynoar, polytetrafluoroethylene, perfluoroethylene-propylene, fluorubber, chlorotrifluoroethylene-alkyl vinyl ether co-polymer;
Described solvent to be selected from dimethylbenzene, n-butanol, butyl acetate, propylene glycol monomethyl ether, monobutyl ether acetate or methyl pyrrolidone one or more mixing;
Described crosslinking agent is one or more the mixing in mylar, many isocyanide esters, amino resins, epoxy resin, Lauxite or gamma-butyrolacton;
Described filler is one or more the mixing in titanium dioxide, silicon dioxide, ultra-fine barium sulfate or precipitated calcium carbonate.
2. back film of solar cell as claimed in claim 1, it is characterized in that the raw material of described fluoropolymer coating also comprises pigment, described pigment comprises carbon black, cobalt blue, chrome yellow, titanium dioxide, iron oxide, and the raw material of described fluoropolymer coating is made up of the component of following quality proportioning:
Polyester PET powder 6 ~ 10%
Fluorine resin 30 ~ 55%
Solvent 10 ~ 20%
Crosslinking agent 2 ~ 6%
Filler 10 ~ 30%
Ethylene glycol 5 ~ 8%
Pigment 0.5 ~ 2%.
3. back film of solar cell as claimed in claim 1, is characterized in that described solvent is propylene glycol monomethyl ether.
4. back film of solar cell as claimed in claim 1, is characterized in that described fluorine resin is polyvinyl fluoride.
5. a production technology for back film of solar cell as claimed in claim 1, is characterized in that the production technology of described solar battery back film comprises the steps:
(1) PET film matrix is carried out preliminary treatment; (2) sanded is carried out after being mixed by proportioning by each raw material components of described fluoropolymer coating, form good leveling property, fineness and be less than 25 microns, the mixed emulsion of modest viscosity, directly be coated on pretreated PET film matrix, be heated to 80 ~ 200 DEG C of bakings, fluoropolymer coating adds hankers flowing to PET film matrix, obtains the fluoropolymer coating of 15 ~ 30 μm after being heating and curing.
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| CN103709953B (en) * | 2013-11-15 | 2016-06-22 | 苏州赛伍应用技术有限公司 | A kind of polymer-coated epithelium and the solar cell backboard containing this polymer-coated epithelium |
| CN103921519B (en) * | 2014-03-19 | 2015-11-11 | 浙江歌瑞新材料有限公司 | A kind of solar cell backboard film and preparation method thereof |
| CN105140328B (en) * | 2015-08-26 | 2017-05-03 | 欧贝黎新能源科技股份有限公司 | Solar cell composite back membrane and preparation method thereof |
| CN105097998B (en) * | 2015-09-01 | 2017-04-05 | 北京铂阳顶荣光伏科技有限公司 | A kind of preparation method and application of solar cell package cephacoria |
| TWI626277B (en) * | 2016-02-18 | 2018-06-11 | 廣科工業股份有限公司 | Polyvinyl fluoride paint and bi-layered coating and method for manufacturing the same |
| CN107819049A (en) * | 2016-09-12 | 2018-03-20 | 珠海兴业节能科技有限公司 | TPF photovoltaic components |
| CN108022988B (en) | 2016-10-31 | 2020-06-30 | 上迈(镇江)新能源科技有限公司 | Laminated structure of photovoltaic module, preparation method of laminated structure and photovoltaic module |
| CN109326666B (en) * | 2017-07-28 | 2021-07-09 | 苏州赛伍应用技术股份有限公司 | Main insulating functional film for solar cell back sheet, back sheet and solar cell module |
| CN108807558A (en) * | 2018-06-13 | 2018-11-13 | 中毅新材料研究院（重庆）有限公司 | A kind of deformable corrosion-resistant photovoltaic module unit of lightweight |
| KR20210021465A (en) * | 2018-06-22 | 2021-02-26 | 가부시키가이샤 고바야시 | Release film and manufacturing method of release film |
| CN109550770A (en) * | 2018-11-23 | 2019-04-02 | 浙江晶科能源有限公司 | A kind of method and apparatus for scrapping photovoltaic back harmless treatment |
| CN109776839A (en) * | 2018-12-24 | 2019-05-21 | 常州回天新材料有限公司 | Back film of solar cell and preparation method thereof |
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| CN101290950A (en) * | 2008-05-23 | 2008-10-22 | 嵊州市新化科技有限公司 | Back film of solar cell and preparing technique thereof |
| CN102746754A (en) * | 2012-05-15 | 2012-10-24 | 乐凯胶片股份有限公司 | Environment-friendly solar cell back film |
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| EP2094748B1 (en) * | 2006-12-21 | 2012-10-17 | E.I. Du Pont De Nemours And Company | Crosslinkable vinyl fluoride copolymer coated film and process for making same |
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| CN101290950A (en) * | 2008-05-23 | 2008-10-22 | 嵊州市新化科技有限公司 | Back film of solar cell and preparing technique thereof |
| CN102746754A (en) * | 2012-05-15 | 2012-10-24 | 乐凯胶片股份有限公司 | Environment-friendly solar cell back film |
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