CN107325459A - A kind of preparation method of PVDF notacorias used for solar batteries - Google Patents

A kind of preparation method of PVDF notacorias used for solar batteries Download PDF

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Publication number
CN107325459A
CN107325459A CN201710333941.0A CN201710333941A CN107325459A CN 107325459 A CN107325459 A CN 107325459A CN 201710333941 A CN201710333941 A CN 201710333941A CN 107325459 A CN107325459 A CN 107325459A
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parts
pvdf
notacorias
preparation
solar batteries
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庄益春
卞祖慧
贾敏
陈宁
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Jiang Sudong Noboru Photovoltaic Science And Technology Ltd
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Jiang Sudong Noboru Photovoltaic Science And Technology Ltd
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    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L27/00—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Compositions of derivatives of such polymers
    • C08L27/02—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Compositions of derivatives of such polymers not modified by chemical after-treatment
    • C08L27/12—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Compositions of derivatives of such polymers not modified by chemical after-treatment containing fluorine atoms
    • C08L27/16—Homopolymers or copolymers or vinylidene fluoride
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
    • C08J5/18—Manufacture of films or sheets
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J7/00—Chemical treatment or coating of shaped articles made of macromolecular substances
    • C08J7/12—Chemical modification
    • C08J7/16—Chemical modification with polymerisable compounds
    • C08J7/18—Chemical modification with polymerisable compounds using wave energy or particle radiation
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L31/00—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
    • H01L31/04—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof adapted as photovoltaic [PV] conversion devices
    • H01L31/042—PV modules or arrays of single PV cells
    • H01L31/048—Encapsulation of modules
    • H01L31/049—Protective back sheets
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L31/00—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
    • H01L31/18—Processes or apparatus specially adapted for the manufacture or treatment of these devices or of parts thereof
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2327/00—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Derivatives of such polymers
    • C08J2327/02—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Derivatives of such polymers not modified by chemical after-treatment
    • C08J2327/12—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Derivatives of such polymers not modified by chemical after-treatment containing fluorine atoms
    • C08J2327/16—Homopolymers or copolymers of vinylidene fluoride
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2433/00—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Derivatives of such polymers
    • C08J2433/04—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Derivatives of such polymers esters
    • C08J2433/06—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Derivatives of such polymers esters of esters containing only carbon, hydrogen, and oxygen, the oxygen atom being present only as part of the carboxyl radical
    • C08J2433/10—Homopolymers or copolymers of methacrylic acid esters
    • C08J2433/12—Homopolymers or copolymers of methyl methacrylate
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
    • C08K3/20—Oxides; Hydroxides
    • C08K3/22—Oxides; Hydroxides of metals
    • C08K2003/2237—Oxides; Hydroxides of metals of titanium
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
    • C08K3/24—Acids; Salts thereof
    • C08K3/26—Carbonates; Bicarbonates
    • C08K2003/262—Alkali metal carbonates
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2203/00—Applications
    • C08L2203/16—Applications used for films
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2203/00—Applications
    • C08L2203/20—Applications use in electrical or conductive gadgets
    • C08L2203/204—Applications use in electrical or conductive gadgets use in solar cells
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2205/00—Polymer mixtures characterised by other features
    • C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
    • 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
    • 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

The invention provides a kind of preparation method of PVDF notacorias used for solar batteries, first take PVDF, PMMA, silicon carbide powder, titanium dioxide powder, stearic acid, sodium carbonate, atoleine, plasticizer, coupling agent mixing, ball milling, mixture importing single screw extrusion machine is granulated, blown film, obtains basement membrane；Then acrylic acid, styrene, benzophenone, acetone mixing are taken, disperses, obtains mixed liquor；Preferably gained basement membrane is placed in absolute ethyl alcohol and soaked, is dried after taking-up, then is placed in gained mixed liquor, 8 10h are radiated under 500W ultraviolet sources, are cleaned after taking-up with clear water, drying is produced.The present invention introduces highly polar material PMMA, and the dispersiveness for adding titanium dioxide powder to promote PMMA in PVDF in PVDF；Surface modification has been carried out to PVDF in addition, mechanical property, electric property and the water vapo(u)r transmission of pvdf membrane is improved.

Description

A kind of preparation method of PVDF notacorias used for solar batteries
Technical field
The invention belongs to technical field of solar batteries, and in particular to a kind of preparation side of PVDF notacorias used for solar batteries Method.
Background technology
Common solar battery back film is to be bonded in TPT (PVF and PET trilamellar membrane structure) by adhesives such as EVA On solar panel, protection inside battery effect is played.Because particular/special requirement, the film needs good mechanical strength, electricity Characteristic, good weatherability and there is good shielding function to light.
Because the solar battery back film TPT (Tedlar/PET/Tedlar) of commercialization goes out from sun power battery plate Stripping is showed, its cementability is only improved from technique is inadequate so general, therefore employs pvdf membrane as Tedlar Substitute, be on the one hand blended with PMMA, surface modification on the one hand carried out to the film of production.Also to avoid TiO simultaneously2To PVDF Decomposition facilitation.And PVDF substitute Tedlar, simplify technical process because Tedlar essence be decomposition temperature and The PVF of processing temperature closely, in order to process, it is often necessary to be plasticized with cosolvent, to reduce its processing temperature.
PVDF is a kind of organic material of function admirable, density is small, acoustic impedance is low, high mechanical strength, stable chemical performance, The features such as.These features allow PVDF thin film as notacoria used for solar batteries.But because itself melt strength is big, It is difficult to carry out blown film shaping.And PVDF and the cementability of other materials are poor, also limit it as solar battery back film Use.
The content of the invention
The technical problem of solution：It is an object of the invention to provide a kind of preparation method of PVDF notacorias used for solar batteries, Gained PVDF notacorias have good mechanical property, electric property and water vapo(u)r transmission.
Technical scheme：A kind of preparation method of PVDF notacorias used for solar batteries, comprises the following steps：
Step 1, in parts by weight, 10-20 parts of PVDF, 5-12 parts of PMMA, 1-4 parts of silicon carbide powder, titanium oxide powder are taken Last 0.8-2.5 parts, 0.4-1.2 parts of stearic acid, 0.2-0.7 parts of sodium carbonate, 0.1-0.5 parts of atoleine, plasticizer 0.4-0.9 Part, 0.4-0.9 parts of mixing of coupling agent, ball milling, mixture importing single screw extrusion machine is granulated, blown film, obtains basement membrane；
Step 2, in parts by weight, 5-10 parts of acrylic acid, 3-6 parts of styrene, 5-10 parts of benzophenone, 5-10 parts of acetone are taken Mixing, disperses, obtains mixed liquor；
Step 3, step 1 gained basement membrane is placed in absolute ethyl alcohol and soaked, dried after taking-up, then be placed in mixed obtained by step 2 Close in liquid, 8-10h is radiated under 500W ultraviolet sources, cleaned after taking-up with clear water, drying is produced.
Further, the coupling agent is KH550.
Further, in step 1 single screw extrusion machine prilling temperature be 160-210 DEG C, blown film temperature be 160-220 DEG C.
Further, single screw extrusion machine rotating speed is 30-45rpm in step 1.
Further, dispersion condition is 40-50 DEG C, 800-1000rpm in step 2.
Further, drying condition is 90 DEG C, 3-4h in step 3.
Beneficial effect：The present invention introduces highly polar material PMMA in PVDF, and adds titanium dioxide powder to promote Dispersivenesses of the PMMA in PVDF；Surface modification has been carried out to PVDF in addition, mechanical property, the electric property of pvdf membrane is improved And water vapo(u)r transmission.
Embodiment
Embodiment 1
A kind of preparation method of PVDF notacorias used for solar batteries, comprises the following steps：
Step 1, in parts by weight, take PVDF10 parts, it is 5 parts of PMMA, 1 part of silicon carbide powder, 0.8 part of titanium dioxide powder, hard 0.4 part of resin acid, 0.2 part of sodium carbonate, 0.1 part of atoleine, 0.4 part of plasticizer, 0.4 part of mixing of coupling agent, ball milling, mixture are led Enter single screw extrusion machine granulated, blown film, obtain basement membrane；
Step 2, in parts by weight, 5 parts of acrylic acid, 3 parts of styrene, 5 parts of benzophenone, 5 parts of mixing of acetone are taken, are disperseed, Obtain mixed liquor；
Step 3, step 1 gained basement membrane is placed in absolute ethyl alcohol and soaked, dried after taking-up, then be placed in mixed obtained by step 2 Close in liquid, 8-10h is radiated under 500W ultraviolet sources, cleaned after taking-up with clear water, drying is produced.
Wherein, the coupling agent is KH550.
In step 1 single screw extrusion machine prilling temperature be 160-210 DEG C, blown film temperature be 160-220 DEG C, Single screw extrusion Machine rotating speed is 30rpm.
Dispersion condition is 40 DEG C, 1000rpm in step 2.
Drying condition is 90 DEG C, 3-4h in step 3.
Embodiment 2
A kind of preparation method of PVDF notacorias used for solar batteries, comprises the following steps：
Step 1, in parts by weight, take 13 parts of PVDF, 7 parts of PMMA, 2 parts of silicon carbide powder, 1.5 parts of titanium dioxide powder, 0.7 part of stearic acid, 0.4 part of sodium carbonate, 0.3 part of atoleine, 0.6 part of plasticizer, 0.7 part of mixing of coupling agent, ball milling, mixture Importing single screw extrusion machine is granulated, blown film, obtains basement membrane；
Step 2, in parts by weight, 7 parts of acrylic acid, 4 parts of styrene, 7 parts of benzophenone, 8 parts of mixing of acetone are taken, are disperseed, Obtain mixed liquor；
Step 3, step 1 gained basement membrane is placed in absolute ethyl alcohol and soaked, dried after taking-up, then be placed in mixed obtained by step 2 Close in liquid, 8-10h is radiated under 500W ultraviolet sources, cleaned after taking-up with clear water, drying is produced.
Wherein, the coupling agent is KH550.
In step 1 single screw extrusion machine prilling temperature be 160-210 DEG C, blown film temperature be 160-220 DEG C, Single screw extrusion Machine rotating speed is 30rpm.
Dispersion condition is 40 DEG C, 1000rpm in step 2.
Drying condition is 90 DEG C, 3-4h in step 3.
Embodiment 3
A kind of preparation method of PVDF notacorias used for solar batteries, comprises the following steps：
Step 1, in parts by weight, take 18 parts of PVDF, 9 parts of PMMA, 3 parts of silicon carbide powder, 2.2 parts of titanium dioxide powder, 0.9 part of stearic acid, 0.6 part of sodium carbonate, 0.4 part of atoleine, 0.7 part of plasticizer, 0.6 part of mixing of coupling agent, ball milling, mixture Importing single screw extrusion machine is granulated, blown film, obtains basement membrane；
Step 2, in parts by weight, 8 parts of acrylic acid, 5 parts of styrene, 7 parts of benzophenone, 8 parts of mixing of acetone are taken, are disperseed, Obtain mixed liquor；
Step 3, step 1 gained basement membrane is placed in absolute ethyl alcohol and soaked, dried after taking-up, then be placed in mixed obtained by step 2 Close in liquid, 8-10h is radiated under 500W ultraviolet sources, cleaned after taking-up with clear water, drying is produced.
Wherein, the coupling agent is KH550.
In step 1 single screw extrusion machine prilling temperature be 160-210 DEG C, blown film temperature be 160-220 DEG C, Single screw extrusion Machine rotating speed is 30rpm.
Dispersion condition is 40 DEG C, 1000rpm in step 2.
Drying condition is 90 DEG C, 3-4h in step 3.
Embodiment 4
A kind of preparation method of PVDF notacorias used for solar batteries, comprises the following steps：
Step 1, in parts by weight, take 20 parts of PVDF, 12 parts of PMMA, 4 parts of silicon carbide powder, 2.5 parts of titanium dioxide powder, 1.2 parts of stearic acid, 0.7 part of sodium carbonate, 0.5 part of atoleine, 0.9 part of plasticizer, 0.9 part of mixing of coupling agent, ball milling, mixture Importing single screw extrusion machine is granulated, blown film, obtains basement membrane；
Step 2, in parts by weight, 10 parts of acrylic acid, 6 parts of styrene, 10 parts of benzophenone, 10 parts of mixing of acetone are taken, point Dissipate, obtain mixed liquor；
Step 3, step 1 gained basement membrane is placed in absolute ethyl alcohol and soaked, dried after taking-up, then be placed in mixed obtained by step 2 Close in liquid, 8-10h is radiated under 500W ultraviolet sources, cleaned after taking-up with clear water, drying is produced.
Wherein, the coupling agent is KH550.
In step 1 single screw extrusion machine prilling temperature be 160-210 DEG C, blown film temperature be 160-220 DEG C, Single screw extrusion Machine rotating speed is 30rpm.
Dispersion condition is 40 DEG C, 1000rpm in step 2.
Drying condition is 90 DEG C, 3-4h in step 3.
Performance test is carried out to the gained PVDF of embodiment 1 to 4 notacorias, it is as a result as follows：
As seen from the above table, PVDF notacorias of the invention have good mechanical property, electric property and water vapo(u)r transmission.

Claims (6)

1. a kind of preparation method of PVDF notacorias used for solar batteries, it is characterised in that：Comprise the following steps：
Step 1, in parts by weight, 10-20 parts of PVDF, 5-12 parts of PMMA, 1-4 parts of silicon carbide powder, titanium dioxide powder are taken 0.8-2.5 parts, 0.4-1.2 parts of stearic acid, 0.2-0.7 parts of sodium carbonate, 0.1-0.5 parts of atoleine, 0.4-0.9 parts of plasticizer, 0.4-0.9 parts of mixing of coupling agent, ball milling, mixture importing single screw extrusion machine is granulated, blown film, obtains basement membrane；
Step 2, in parts by weight, 5-10 parts of acrylic acid, 3-6 parts of styrene, 5-10 parts of benzophenone, 5-10 parts of acetone is taken to mix Close, disperse, obtain mixed liquor；
Step 3, step 1 gained basement membrane is placed in absolute ethyl alcohol and soaked, dried after taking-up, then be placed in step 2 gained mixed liquor In, 8-10h is radiated under 500W ultraviolet sources, is cleaned after taking-up with clear water, drying is produced.
2. the preparation method of PVDF notacorias used for solar batteries according to claim 1, it is characterised in that：The coupling agent For KH550.
3. the preparation method of PVDF notacorias used for solar batteries according to claim 1, it is characterised in that：It is single in step 1 Screw extruder prilling temperature is 160-210 DEG C, blown film temperature is 160-220 DEG C.
4. the preparation method of PVDF notacorias used for solar batteries according to claim 1, it is characterised in that：It is single in step 1 Screw extruder rotating speed is 30-45rpm.
5. the preparation method of PVDF notacorias used for solar batteries according to claim 1, it is characterised in that：Divide in step 2 The condition of dissipating is 40-50 DEG C, 800-1000rpm.
6. the preparation method of PVDF notacorias used for solar batteries according to claim 1, it is characterised in that：Dried in step 3 Dry condition is 90 DEG C, 3-4h.
CN201710333941.0A 2017-05-12 2017-05-12 A kind of preparation method of PVDF notacorias used for solar batteries Pending CN107325459A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109774259A (en) * 2018-11-22 2019-05-21 常州回天新材料有限公司 A kind of back film of solar cell and preparation method thereof

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CN104403240A (en) * 2014-11-13 2015-03-11 无锡中洁能源技术有限公司 High light-shading solar battery back membrane material and preparation method thereof

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CN104327433A (en) * 2013-10-30 2015-02-04 东莞市长安东阳光铝业研发有限公司 Preparation method of polyvinylidene fluoride-based thin film
CN104403240A (en) * 2014-11-13 2015-03-11 无锡中洁能源技术有限公司 High light-shading solar battery back membrane material and preparation method thereof

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109774259A (en) * 2018-11-22 2019-05-21 常州回天新材料有限公司 A kind of back film of solar cell and preparation method thereof

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