CN102738280A - Solar cell back membrane - Google Patents
Solar cell back membrane Download PDFInfo
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- CN102738280A CN102738280A CN2012102216209A CN201210221620A CN102738280A CN 102738280 A CN102738280 A CN 102738280A CN 2012102216209 A CN2012102216209 A CN 2012102216209A CN 201210221620 A CN201210221620 A CN 201210221620A CN 102738280 A CN102738280 A CN 102738280A
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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
Abstract
A solar cell back membrane comprises a base material layer and a weather-resistant layer positioned on a surface of the base material layer. An adhesion-promotion resin layer is arranged on the other surface of the base material layer, and is obtained by a method comprising the following steps of (1) melt extrusion: extruding molten adhesion resin on the surface of the base material layer in a melt manner at the temperature of 90-320 DEG C so as to form an adhesion-promotion resin melt membrane layer with the thickness of 5-60 micrometers; (2) cooling forming: cooling the melt membrane layer to the temperature of 40-180 DEG C and performing cooling forming; and (3) laminating: pressing the adhesion-promotion resin melt membrane layer with the base material layer integrally through a pressure roll in the size of 2-6 kilograms/ square centimeters. The solar cell back membrane can be well adhered with an ethylene-vinyl acetate (EVA) sealing adhesive layer, is simple in production process and low in cost, and can guarantee that the service life of a solar cell module is 25 years.
Description
Technical field
The present invention relates to a kind of solar cell, particularly be used for the solar battery back film of solar cell.
Background technology
Solar cell is the device that directly changes into luminous energy electric energy through photoelectric effect, has permanent, spatter property and flexibility three big advantages.Nowadays, solar cell by a large amount of uses in each technical field.
Solar panel is a laminated construction normally, mainly comprises surface layer of glass, EVA sealant layer, solar battery sheet, EVA sealant layer and solar battery back film, and wherein solar cell is wrapped up by two-layer EVA sealant layer.The main effect of solar battery back film is the mechanical strength that improves the integral body of solar panel, can prevent that in addition water vapor permeable is in sealant and influence useful life of battery sheet.
In the prior art, the solar battery back film structure mainly contains: the TPT structure: polyvinyl fluoride (PVF) film/PETG (PET) film/polyvinyl fluoride (PVF) film; TPE structure: polyvinyl fluoride (PVF) film/PET film/vinyl acetate resin (EVA) film.No matter being the notacoria of TPT structure or the notacoria of TPE structure, all is to bond each other through suitable glue between their three-layer thin-film, and glue can be acrylate glue, epoxy glue or polyurethane adhesive, all contains a large amount of solvents.The notacoria of producing a large amount of solvent that not only need volatilize; Complicated process of preparation; Cost is higher, and the ply adhesion of self and all can't reach gratifying degree with the bonding effect of EVA of sealing usefulness, and long-term outdoor use can occur just that the interlayer branch takes off and divide the phenomenon of taking off with EVA; Thereby lose the effect that should have that stops invasion solar modules such as steam, cause the inner battery sheet of solar module etc. impaired.
Summary of the invention
The technical problem that the present invention will solve is the deficiency that overcomes prior art, provide have high bond strength between a kind of and the EVA sealant layer, preparation technology is simple, cost is low solar battery back film.
For solving the problems of the technologies described above, the present invention adopts following technical scheme:
A kind of solar battery back film; It comprises substrate layer and the layer of anti-marquis that is positioned at the substrate layer surface; Another surface at substrate layer is provided with adhesion promoting layer; Said adhesion promoting layer adopts following method to obtain: (1) melt extrudes: under 90 ~ 320 ℃, the tackifying resin of fusion is melt extruded to the substrate layer surface, forming thickness is the tackifying resin melt rete of 5 ~ 60 μ m; (2) cooling forming: tackifying resin melt rete is cooled to 40 ~ 180 ℃, cooling forming; (3) lamination: is one through 2 ~ 6 kilograms/square centimeter pressure rolls with tackifying resin melt rete and substrate layer pressing.
Above-mentioned solar battery back film; Said tackifying resin is ethene polymers and ethylene copolymer, like polyethylene (PE), and low density polyethylene (LDPE) (LDPE); Ethylene-vinyl acetate copolymer (EVA); Ethylene ethyl acrylate copolymer (EEA), ethylene butyl acrylate copolymer (EBA), ethylene methyl acrylate copolymer (EMA).
Above-mentioned solar battery back film, the thickness of said tackifying resin melt rete are 10 ~ 30 μ m.
Above-mentioned solar battery back film, said substrate layer are PTT, gather 2,6-(ethylene naphthalate), polyamide or PETG.
Above-mentioned solar battery back film, said weathering layer are a kind of in polyvinyl fluoride, Kynoar, the ethylene-tetrafluoroethylene copolymer.
Compared with prior art, the present invention has following advantage:
1. the present invention adopts the tack coat of the tackifying resin melt rete conduct that formed by the fusion tackifying resin and EVA, and has excellent bond performance between the EVA sealant layer, can guarantee that solar module is in the not demoulding in 25 years lifetime.
2. the present invention adopts the tack coat of the tackifying resin melt rete conduct that formed by the fusion tackifying resin and EVA; Substitute prior art and adopt coating, drying, the complex method that contains solvent cement; Can effectively reduce the use of chemical solvent, reduce the pollution that environment is produced.
3. the present invention adopts the tack coat of the tackifying resin melt rete conduct that formed by the fusion tackifying resin and EVA, has simplified production technology, has shortened the production time, has improved production efficiency.
Embodiment
Tackifying resin is surperficial to substrate layer through melt extruded equipment curtain coating among the present invention; Melt extruded equipment is the known equipment that melt extrudes; Preferred gradation type single screw extrusion machine; Screw-rod structure is a syllogic, between the compression section of screw rod and homogenizing zone, need install kneading device additional, and the draw ratio of screw rod is 25:1 ~ 40:1.
The temperature that melt extrudes of tackifying resin according to the invention is 90 ~ 320 ℃, if being higher than 320 ℃ extrudes, then tackifying resin will partly decompose carbonization, influence bond effect; If being lower than 90 ℃ extrudes, then tackifying resin fails fully to melt, and can influence the uniformity of tack coat and the durability of cohesive force; Tackifying resin described in the present invention is selected from ethene polymers and ethylene copolymer, like polyethylene (PE), low density polyethylene (LDPE) (LDPE), ethylene-vinyl acetate copolymer (EVA), ethylene ethyl acrylate copolymer (EEA), ethylene butyl acrylate copolymer (EBA), ethylene methyl acrylate copolymer (EMA).
From adhesion strength, the angle of production cost and solar battery back film lightweight effect is set out, and the present invention is 5 ~ 60 μ m with the thickness range of tackifying resin melt rete, preferred 10 ~ 30 μ m.If the tackifying resin floor height is in 60 μ m, then the tackifying resin consumption too much causes production cost to raise, and does not satisfy the light-weighted effect of solar battery back film; If the tackifying resin bed thickness is lower than 5 μ m, then because the wetting and contact point abundant to bonded can not form can not reach the requirement of cohesive force.
The present invention is controlled at the lamination pressure of tackifying resin layer and substrate layer at 2 ~ 6 kilograms/square centimeter, if be higher than this pressure lamination, might rete be destroyed, and can improve the specification requirement to pressure roll simultaneously, causes unnecessary waste; If be lower than this pressure, then can cause cohesive force can not reach the expection requirement.
In order to ensure the weather resisteant of solar battery back film; Insulating properties; Generally select for use fluorine film or fluorine coating as weathering layer; The present invention uses the fluorine film as weathering layer, and described fluorine film is a kind of in polyvinyl fluoride (PVF), Kynoar (PVDF), the ethylene-tetrafluoroethylene copolymer (ETFE).
Below in conjunction with specific embodiment the present invention is further described, but is not limited to this.
Embodiment 1
At thickness is coating polyurethane-type binding agent liquid on 250 μ mPET films, one side, after high temperature drying, the ETFE film is fitted with it.
Ethylene ethyl acrylate copolymer (EEA) is added in the hopper of extruder, under 320 ℃, through the heating of extruding machine barrel and the shear action of screw rod; Make ethylene ethyl acrylate copolymer become melt flow stream by graininess; The moulding effect of through port mould again obtains the ethylene ethyl acrylate copolymer film of melt shape, and with the fused film curtain coating to PET film opposite side; Through regulating the rotating speed of extruder screw, forming thickness is 5 μ m tackifying resin melt retes; When melt films is cooled to 180 ℃, through 6 kilograms/square centimeter pressure roll, be one with ethylene ethyl acrylate copolymer film and PET film laminating, obtain solar battery back film.Test its performance.
Embodiment 2
At thickness is coating epoxy type binding agent liquid on 250 μ mPET films, one side, after high temperature drying, the PVF film is fitted with it.
Low density polyethylene (LDPE) (LDPE) is added in the hopper of extruder, under 130 ℃ of temperature, through the heating of extruding machine barrel and the shear action of screw rod; Make low density polyethylene (LDPE) become melt flow stream by graininess; The moulding effect of through port mould again obtains the low density polyethylene films of melt shape, and with the fused film curtain coating to PET film opposite side; Through regulating the rotating speed of extruder screw, forming thickness is 60 μ m binding resin melt retes; When melt films is cooled to 50 ℃, through 4 kilograms/square centimeter pressure roll, be one with low density polyethylene films and PET film laminating, obtain solar battery back film.
Embodiment 3
At thickness is coating polyurethane-type binding agent liquid on 250 μ mPET films, one side, after high temperature drying, pvdf membrane is fitted with it.
Polyethylene (PE) is added in the hopper of extruder, under 140 ℃ of temperature, through the heating of extruding machine barrel and the shear action of screw rod; Make polyethylene become melt flow stream by graininess; The moulding effect of through port mould again obtains the polyethylene film of melt shape, and with the fused film curtain coating to PET film opposite side; Through regulating the rotating speed of extruder screw, forming thickness is 30 μ m binding resin melt retes; When melt films is cooled to 60 ℃, through 4 kilograms/square centimeter pressure roll, be one with polyethylene film and PET film laminating, obtain solar battery back film.Survey its performance.
Embodiment 4
At thickness is coated polyester type binding agent liquid on 250 μ mPET films, one side, after high temperature drying, the ETFE film is fitted with it.
Ethylene-vinyl acetate copolymer (EVA) is added in the hopper of extruder, under 90 ℃ of temperature, through the heating of extruding machine barrel and the shear action of screw rod; Make ethylene-vinyl acetate copolymer become melt flow stream by graininess; The moulding effect of through port mould again obtains the ethylene-vinyl acetate copolymer film of melt shape, and with the fused film curtain coating to PET film opposite side; Through regulating the rotating speed of extruder screw, forming thickness is 10 μ m binding resin melt retes; When melt films is cooled to 40 ℃, through 2 kilograms/square centimeter pressure roll, be one with ethylene-vinyl acetate copolymer film and PET film laminating, obtain solar battery back film.Survey its performance.
Embodiment 5
Coated polyester type binding agent liquid after high temperature drying, is fitted the ETFE film with it on PTT film one side.
Ethylene-vinyl acetate copolymer (EVA) is added in the hopper of extruder, under 200 ℃ of temperature, through the heating of extruding machine barrel and the shear action of screw rod; Make ethylene-vinyl acetate copolymer become melt flow stream by graininess; The moulding effect of through port mould again obtains the ethylene-vinyl acetate copolymer film of melt shape, and with the fused film curtain coating to the film opposite side; Through regulating the rotating speed of extruder screw, forming thickness is 45 μ m binding resin melt retes; When melt films is cooled to 150 ℃, through 5 kilograms/square centimeter pressure roll, be one with ethylene-vinyl acetate copolymer film and film laminating, obtain solar battery back film.Survey its performance.
Embodiment 6
Coated polyester type binding agent liquid after high temperature drying, is fitted the PVF film with it on polyamide film one side.
Ethylene methyl acrylate copolymer (EMA) is added in the hopper of extruder, under 320 ℃ of temperature, through the heating of extruding machine barrel and the shear action of screw rod; Make ethylene methyl acrylate copolymer become melt flow stream by graininess; The moulding effect of through port mould again obtains the ethylene methacrylate of melt shape, and with the fused film curtain coating to the film opposite side; Through regulating the rotating speed of extruder screw, forming thickness is 15 μ m binding resin melt retes; When melt films is cooled to 180 ℃, through 2.5 kilograms/square centimeter pressure roll, be one with ethylene methyl acrylate copolymer film and film laminating, obtain solar battery back film.Survey its performance.
Comparative Examples 1
At thickness is coating polyurethane-type binding agent liquid on 250 μ mPET films, one side, after high temperature drying, the ETFE film is fitted with it.Opposite side at the PET film adopts the identical compound ETFE film of method, promptly obtains solar battery back film.Survey its performance.
Comparative Examples 2
At thickness is coating polyurethane-type binding agent liquid on 250 μ mPET films, one side, after high temperature drying, pvdf membrane is fitted with it.Opposite side at the PET film adopts the identical compound PE film of method, promptly obtains solar battery back film.Survey its performance.
Table 1: each embodiment performance data table
| Embodiment | Adhesion strength (N/cm) with encapsulating material EVA | The weatherability test |
| Embodiment 1 | 80 | Through |
| Embodiment 2 | 80 | Through |
| Embodiment 3 | 90 | Through |
| Embodiment 4 | 100 | Through |
| Embodiment 5 | 70 | Through |
| Embodiment 6 | 80 | Through |
| Comparative Examples 1 | 40 | Through |
| Comparative Examples 2 | 60 | Through |
In the table, adhesion strength is tested according to standard GB/T8808; Weatherability is used the weather-proof ageing oven of Q-Sun Xe-3-H type xenon lamp, and establishing criteria ISO 4892-2 tests.
Performance data by in the table can be found out, the adhesion strength between solar battery back film provided by the invention and the encapsulating material EVA is higher than far away and adopts TPT and the solar battery back film of TPE structure and the adhesion strength between the encapsulating material EVA; The weather resisteant of notacoria can also can be satisfied the demand fully simultaneously.
Claims (5)
1. solar battery back film; It comprises substrate layer and the layer of anti-marquis that is positioned at the substrate layer surface; It is characterized in that be provided with adhesion promoting layer on another surface of substrate layer, described adhesion promoting layer adopts following method to obtain: (1) melt extrudes: under 90 ~ 320 ℃; The tackifying resin of fusion is melt extruded to the substrate layer surface, and forming thickness is the tackifying resin melt rete of 5 ~ 60 μ m; (2) cooling forming: the melt rete is cooled to 40 ~ 180 ℃, cooling forming; (3) lamination: is one through 2 ~ 6 kilograms/square centimeter pressure rolls with tackifying resin melt rete and substrate layer pressing.
2. solar battery back film according to claim 1; It is characterized in that said tackifying resin is polyethylene, low density polyethylene (LDPE), ethylene-vinyl acetate copolymer, ethylene ethyl acrylate copolymer, ethylene butyl acrylate copolymer, ethylene methyl acrylate copolymer.
3. solar battery back film according to claim 2 is characterized in that, the thickness of said tackifying resin melt rete is 10 ~ 30 μ m.
4. solar battery back film according to claim 3 is characterized in that, said substrate layer is PTT, gathers 2,6-(ethylene naphthalate), polyamide or PETG.
5. solar battery back film according to claim 4 is characterized in that, said weathering layer is polyvinyl fluoride, Kynoar, ethylene-tetrafluoroethylene copolymer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012102216209A CN102738280A (en) | 2012-06-30 | 2012-06-30 | Solar cell back membrane |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012102216209A CN102738280A (en) | 2012-06-30 | 2012-06-30 | Solar cell back membrane |
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| CN102738280A true CN102738280A (en) | 2012-10-17 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2012102216209A Pending CN102738280A (en) | 2012-06-30 | 2012-06-30 | Solar cell back membrane |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103627341A (en) * | 2013-11-19 | 2014-03-12 | 常熟市长江胶带有限公司 | Insulated rubber tape |
| CN104393082A (en) * | 2014-11-14 | 2015-03-04 | 无锡中洁能源技术有限公司 | Insulating solar panel back film and preparation method thereof |
| CN104393083A (en) * | 2014-11-14 | 2015-03-04 | 无锡中洁能源技术有限公司 | Back membrane of solar cell and preparation method of back membrane |
| CN105694391A (en) * | 2016-03-21 | 2016-06-22 | 苏州锦腾电子科技有限公司 | Back film for solar cell |
| CN107129765A (en) * | 2017-05-15 | 2017-09-05 | 卡姆丹克太阳能（江苏）有限公司 | A kind of MoSe2The PMMA photovoltaic component encapsulating glued membranes that graphene is modified altogether |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102208465A (en) * | 2011-05-16 | 2011-10-05 | 杭州福斯特光伏材料股份有限公司 | Packaging material for solar battery component |
| CN102368511A (en) * | 2011-11-15 | 2012-03-07 | 乐凯胶片股份有限公司 | Preparation method of solar cell back film |
-
2012
- 2012-06-30 CN CN2012102216209A patent/CN102738280A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102208465A (en) * | 2011-05-16 | 2011-10-05 | 杭州福斯特光伏材料股份有限公司 | Packaging material for solar battery component |
| CN102368511A (en) * | 2011-11-15 | 2012-03-07 | 乐凯胶片股份有限公司 | Preparation method of solar cell back film |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103627341A (en) * | 2013-11-19 | 2014-03-12 | 常熟市长江胶带有限公司 | Insulated rubber tape |
| CN104393082A (en) * | 2014-11-14 | 2015-03-04 | 无锡中洁能源技术有限公司 | Insulating solar panel back film and preparation method thereof |
| CN104393083A (en) * | 2014-11-14 | 2015-03-04 | 无锡中洁能源技术有限公司 | Back membrane of solar cell and preparation method of back membrane |
| CN104393082B (en) * | 2014-11-14 | 2016-08-24 | 无锡中洁能源技术有限公司 | A kind of insulated type back film of solar cell and preparation method thereof |
| CN105694391A (en) * | 2016-03-21 | 2016-06-22 | 苏州锦腾电子科技有限公司 | Back film for solar cell |
| CN107129765A (en) * | 2017-05-15 | 2017-09-05 | 卡姆丹克太阳能（江苏）有限公司 | A kind of MoSe2The PMMA photovoltaic component encapsulating glued membranes that graphene is modified altogether |
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Application publication date: 20121017 |