CN103522658B - Backboard for metal perforation type solar battery and preparation method of backboard - Google Patents
Backboard for metal perforation type solar battery and preparation method of backboard Download PDFInfo
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- CN103522658B CN103522658B CN201310425762.1A CN201310425762A CN103522658B CN 103522658 B CN103522658 B CN 103522658B CN 201310425762 A CN201310425762 A CN 201310425762A CN 103522658 B CN103522658 B CN 103522658B
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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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Abstract
The invention discloses a backboard for a metal perforation type solar battery and a preparation method of the backboard. The backboard sequentially comprises an insulation layer, a metal layer, an adhering layer, a base material layer and a weather-resisting layer, wherein the weather-resisting layer which is a fluororesin-containing composition is coated on the base material layer through a coating device, the fluororesin-containing composition comprises, in the total 100 percent, 25-50 percent of modified fluororesin, 1-5 percent of fumed silica, 10-25 percent of titanium dioxide, 1-10 percent of curing agent and 30-50 percent of solvent. Through optimized design of the fluororesin-containing composition formula, the fluororesin can be well combined with the base material layer under the condition of no addition of any adhesive, thus the weather-resisting layer becomes thinner, relevant materials are reduced, the production process is simplified, and the cost of the backboard is lowered; and meanwhile, the backboard is high in weather resistance, ultraviolet resistance and hydrothermal resistance performance, thus the protection function on a solar assembly is greatly improved, and the service life of the solar assembly is prolonged.
Description
Technical field
The present invention relates to solar energy Backplane area technology, particularly provide a kind of metal piercing formula backboard used for solar batteries
And preparation method thereof.
Background technology
In solar components, the effect of solar cell backboard should not be underestimated, and solar cell backboard plays protection light
The effect of the cell piece in volt assembly.Traditional backboard mode of production is will be particularly poly- for pre-manufactured fluoropolymer film
PVF (PVDF) film is pasted on polyester (PET) base material it is typical that attaching fluoropolymer film in PET both sides and being formed
" sandwich " structure, its production technology is to be respectively coated thermosetting polyester adhesive on base material two sides, then hot pressing coating thickness
For the PVDF thin film of 38 m, obtain the backboard of traditional approach manufacture.In prior art, Chinese invention patent number is
200710069782.4, the weathering layer film thickness that it is adopted is 0.035 ~ 0.045mm.
Although this kind of backboard significantly improves the service life of solar components, but in different moistures, temperature, oxygen
Under the impact of gas and ultraviolet and destruction, there is higher requirement to backboard in weatherability, uvioresistant and moisture-resistant hot property,
Simultaneously in prior art, because the fluoropolymer film of pre-manufactured must have enough thickness fitting and post-processing journey to meet
Requirement to its intensity in program process is so that the actual (real) thickness ratio of film, for providing the thickness needed for protective value big, causes price
The waste of expensive fluorine resin film, improves the cost of product；More and more fierce with market competition, how to reduce product
Cost also becomes one of major issue problem of each researcher's urgent need to resolve.
Content of the invention
In view of this, the present invention be directed to prior art presences disappearance, its main purpose be offer a kind of have good
Metal piercing formula backboard used for solar batteries of weatherability, uvioresistant and moisture-resistant hot property and preparation method thereof.
For achieving the above object, the present invention is using following technical scheme：A kind of metal piercing formula back of the body used for solar batteries
Plate, includes insulating barrier, metal level, tack coat, substrate layer and weathering layer successively, and described weathering layer is coated by coating apparatus
On substrate layer, this weathering layer is fluororesin composition, and this fluororesin composition includes based on quality 100%：
Modified fluorin resin 25-50%；
Aerosil 1-5%；
Titanium dioxide 10-25 %；
Curing agent 1-10 %；
Solvent 30-50 %.
Described modified fluorin resin be with carboxylic acid group, sulfonic group, aziridine base, NCO, epoxy radicals, amido,
Hydroxyl, active methylene group or more radical mixture be modified process vinylidene, tetrafluoroethene, the homopolymerization of hexafluoropropene
The copolymer of thing or two of which or three kinds.
Described curing agent is polyisocyanates, hexamethylene diisocyanate, hydrogenated diphenyl methane diisocyanate, different
One or more of isophorone diisocyanate.
Described substrate layer is polyethylene terephthalate, polybutylene terephthalate (PBT) and poly- naphthalenedicarboxylic acid second
One or more of diol ester.
Described tack coat is epoxyn, saturated polyester adhesive, polyurethane adhesive, acrylic resin are gluing
One of agent or several mixtures.
Described metal level is Copper Foil, aluminium foil or nickel foil.
Described insulating barrier is that epoxy resin ink, polyester resin ink or acrylic resin ink are brushed by screen printing
Cloth on the metal layer, is then solidified into insulating barrier.
The thickness of described weathering layer is 20 m ~ 25 m.
A kind of preparation method of metal piercing formula backboard used for solar batteries, prepares fluororesin composition, first by modified fluorine
Resin 25-50%, aerosil 1-5%, titanium dioxide 10-25 %, curing agent 1-10 % and solvent 30-50 % mix；
Then pass through scraper for coating method, fluororesin composition is coated on a surface of substrate layer, through baking oven baking
Form weathering layer after solidification；
Tack coat is then coated with another surface of substrate layer, then hot pressing laminating metal level on tack coat；
Finally after metal level printed wiring, serigraphy insulating barrier in the above.
The present invention compared with prior art has clear advantage and beneficial effect, beneficial effects of the present invention：By right
The optimization design of weather-proof layer formula, makes prepared metal piercing formula backboard used for solar batteries have relatively low moisture-vapor transmission
Higher anti-electrical breakdown performance；Meanwhile, this backboard has stronger weatherability, uvioresistant and moisture-resistant hot property, wherein logical
Cross using modified fluorin resin be host, simultaneously cooperation curing agent using formed response type mixture after, its crosslink density is bigger,
Obtained weathering layer has good tack to substrate layer, and this tack is can not to be compared using non-modified fluorine resin
, after the optimization design of this weathering layer, its protective effect to solar components can be greatly improved, thus improving solar energy group
The service life of part.Due to having stronger adhesive force using modified fluorin resin weathering layer and substrate layer, centre does not need to add
Other adhesives just can reach identical protected effect so that this weathering layer becomes thinner, thus reducing associated materials and letter
Change production technology, reduced product cost, improve the competitiveness of product in market.
Brief description
Fig. 1 is the simplified schematic diagram of the preferred embodiment of the utility model.
Accompanying drawing identifier declaration
10th, insulating barrier
20th, metal level
30th, tack coat
40th, substrate layer
50th, weathering layer.
Specific embodiment
Embodiment 1
A kind of metal piercing formula backboard used for solar batteries, includes insulating barrier, metal level, tack coat, substrate layer successively
And weathering layer, described weathering layer is coated on substrate layer by coating apparatus, and this weathering layer is fluororesin composition, and this contains
Fluorin resin composition includes based on quality 100%：
Modified fluorin resin 46%；
Aerosil 4%；
Titanium dioxide 15 %；
Curing agent 5%；
Butyl ester 30%.
Described modified fluorin resin is the vinylidene fluoride copolymers being modified process with carboxylic acid group and two groups of hydroxyl.
This curing agent is polyisocyanates.
This substrate layer is polyethylene terephthalate.
This tack coat is epoxyn.
This metal level is Copper Foil.
This insulating barrier is coated with the metal layer for epoxy resin ink by serigraphy, is then solidified into insulating barrier.
The thickness of this weathering layer is 20 m.
The preparation method of this metal piercing formula backboard used for solar batteries, including having the following steps：
Prepare fluororesin composition first, by modified fluorin resin 46%, aerosil 4%, titanium dioxide 15 %, solidification
Agent 5 % and solvent 30% mix；
Then pass through scraper for coating method, fluororesin composition is coated on a surface of substrate layer, through baking oven baking
Form weathering layer after solidification；
Tack coat is then coated with another surface of substrate layer, then hot pressing laminating metal level on tack coat；
Finally after metal level printed wiring, serigraphy insulating barrier in the above.
Embodiment 2
A kind of metal piercing formula backboard used for solar batteries, includes insulating barrier, metal level, tack coat, substrate layer successively
And weathering layer, described weathering layer is coated on substrate layer by coating apparatus, and this weathering layer is fluororesin composition, and this contains
Fluorin resin composition includes based on quality 100%：
Modified fluorin resin 25%；
Aerosil 2%；
Titanium dioxide 20 %；
Curing agent 8 %；
Butyl ester 45%.
This modified fluorin resin is the hexafluoropropene homopolymers being modified process with carboxylic acid group.
This curing agent is hydrogenated diphenyl methane diisocyanate.
This substrate layer is polybutylene terephthalate (PBT).
This tack coat is saturated polyester adhesive.
This metal level is aluminium foil.
This insulating barrier is coated with the metal layer for polyester resin ink by serigraphy, is then solidified into insulating barrier.
The thickness of this weathering layer is 25 m.
The preparation method of this metal piercing formula backboard used for solar batteries, comprises the steps：
Prepare fluororesin composition first, by modified fluorin resin 25%, aerosil 2%, titanium dioxide 20 %, solidification
Agent 8 % and solvent 45 % mixes；
Then pass through scraper for coating method, fluororesin composition is coated on a surface of substrate layer, through baking oven baking
Form weathering layer after solidification；
Tack coat is then coated with another surface of substrate layer, then hot pressing laminating metal level on tack coat；
Finally after metal level printed wiring, serigraphy insulating barrier in the above.
Embodiment 3
A kind of metal piercing formula backboard used for solar batteries, includes insulating barrier, metal level, tack coat, substrate layer successively
And weathering layer, described weathering layer is coated on substrate layer by coating apparatus, and this weathering layer is fluororesin composition, and this contains
Fluorin resin composition includes based on quality 100%：
Modified fluorin resin 35%；
Aerosil 3%；
Titanium dioxide 25%；
Curing agent 5 %；
Butyl ester 32%.
This modified fluorin resin is the proplast modified with aziridine base.
This curing agent is hexamethylene diisocyanate.
This substrate layer is PEN.
This tack coat is polyurethane adhesive.
This metal level is Copper Foil.
This insulating barrier is that epoxy resin ink, polyester resin ink or acrylic resin ink are coated with by serigraphy
On the metal layer, then it is solidified into insulating barrier.
The thickness of this weathering layer is 22 m.
The preparation method of this metal piercing formula backboard used for solar batteries, prepares fluororesin composition first, by modification
Fluororesin 35%, aerosil 3%, titanium dioxide 25 %, curing agent 5 % and solvent 32 % mix；
Then pass through scraper for coating method, fluororesin composition is coated on a surface of substrate layer, through baking oven baking
Form weathering layer after solidification；
Tack coat is then coated with another surface of substrate layer, then hot pressing laminating metal level on tack coat；
Finally after metal level printed wiring, serigraphy insulating barrier in the above.
Embodiment 4
A kind of metal piercing formula backboard used for solar batteries, includes insulating barrier, metal level, tack coat, substrate layer successively
And weathering layer, described weathering layer is coated on substrate layer by coating apparatus, and this weathering layer is fluororesin composition, and this contains
Fluorin resin composition includes based on quality 100%：
Modified fluorin resin 45%；
Aerosil 3%；
Titanium dioxide 10 %；
Curing agent 2%；
Butyl ester 30%.
This modified fluorin resin is the copolymer of the tetrafluoroethene being modified processing with carboxylic acid group and sulfonic group two group.
This curing agent is IPDI.
This substrate layer is polyethylene terephthalate.
This tack coat is acrylic resin adhesive.
This metal level is Copper Foil.
This insulating barrier is coated with the metal layer for epoxy resin ink by serigraphy, is then solidified into insulating barrier.
The thickness of this weathering layer is 25 m.
The preparation method of this metal piercing formula backboard used for solar batteries, including having the following steps：
Prepare fluororesin composition first, by modified fluorin resin 45%, aerosil 3%, titanium dioxide 10 %, solidification
Agent 2% and solvent 30 % mix；
Then pass through scraper for coating method, fluororesin composition is coated on a surface of substrate layer, through baking oven baking
Form weathering layer after solidification；
Tack coat is then coated with another surface of substrate layer, then hot pressing laminating metal level on tack coat；
Finally after metal level printed wiring, serigraphy insulating barrier in the above.
Embodiment 5
A kind of metal piercing formula backboard used for solar batteries, includes insulating barrier, metal level, tack coat, substrate layer successively
And weathering layer, described weathering layer is coated on substrate layer by coating apparatus, and this weathering layer is fluororesin composition, and this contains
Fluorin resin composition includes based on quality 100%：
Modified fluorin resin 40%；
Aerosil 3%；
Titanium dioxide 15%；
Curing agent 10%；
Butyl ester 32 %.
This modified fluorin resin is the homopolymers of the vinylidene modified with aziridine base.
This curing agent is hydrogenated diphenyl methane diisocyanate.
This substrate layer is polyethylene terephthalate.
This tack coat is polyurethane adhesive.
This metal level is Copper Foil.
This insulating barrier is coated with the metal layer for polyester resin ink by serigraphy, is then solidified into insulating barrier.
The thickness of this weathering layer is 20 m.
The preparation method of this metal piercing formula backboard used for solar batteries, including having the following steps：
Prepare fluororesin composition first, by modified fluorin resin 40%, aerosil 3%, titanium dioxide 15 %, solidification
Agent 10 % and solvent 32 % mixes；
Then pass through scraper for coating method, fluororesin composition is coated on a surface of substrate layer, through baking oven baking
Form weathering layer after solidification；
Tack coat is then coated with another surface of substrate layer, then hot pressing laminating metal level on tack coat；
Finally after metal level printed wiring, serigraphy insulating barrier in the above.
Embodiment 6
A kind of metal piercing formula backboard used for solar batteries, includes insulating barrier, metal level, tack coat, substrate layer successively
And weathering layer, described weathering layer is coated on substrate layer by coating apparatus, and this weathering layer is fluororesin composition, and this contains
Fluorin resin composition includes based on quality 100%：
Modified fluorin resin 35%；
Aerosil 1%；
Titanium dioxide 10%；
Curing agent 4%；
Solvent 50 %.
This modified fluorin resin is the modified hexafluoropropene homopolymers of NCO.
This curing agent is IPDI.
This substrate layer is polyethylene terephthalate.
This tack coat is acrylic resin adhesive.
This metal level is nickel foil.
This insulating barrier is coated with the metal layer for epoxy resin ink by serigraphy, is then solidified into insulating barrier.
The thickness of this weathering layer is 23 m.
The preparation method of this metal piercing formula backboard used for solar batteries, comprises the steps：
Prepare fluororesin composition first, by modified fluorin resin 35%, aerosil 1%, titanium dioxide 10 %, solidification
Agent 4 % and solvent 50 % mixes；
Then pass through scraper for coating method, fluororesin composition is coated on a surface of substrate layer, through baking oven baking
Form weathering layer after solidification；
Tack coat is then coated with another surface of substrate layer, then hot pressing laminating metal level on tack coat；
Finally after metal level printed wiring, serigraphy insulating barrier in the above.
Embodiment 7
A kind of metal piercing formula backboard used for solar batteries, includes insulating barrier, metal level, tack coat, substrate layer successively
And weathering layer, described weathering layer is coated on substrate layer by coating apparatus, and this weathering layer is fluororesin composition, and this contains
Fluorin resin composition includes based on quality 100%：
Modified fluorin resin 50%；
Aerosil 2%；
Titanium dioxide 13 %；
Curing agent 5 %；
Solvent 30 %.
This modified fluorin resin is the modified vinylidene fluoride homopolymer of active methylene group.
This curing agent is polyisocyanates.
This substrate layer is polybutylene terephthalate (PBT).
This tack coat is epoxyn.
This metal level is aluminium foil.
This insulating barrier is coated with the metal layer for polyester resin ink by serigraphy, is then solidified into insulating barrier.
The thickness of this weathering layer is 25 m.
A kind of preparation method of metal piercing formula backboard used for solar batteries, prepares fluororesin composition first, will change
Property fluororesin 50%, aerosil 2%, titanium dioxide 13 %, curing agent 5 % and solvent 30 % mix；
Then pass through scraper for coating method, fluororesin composition is coated on a surface of substrate layer, through baking oven baking
Form weathering layer after solidification；
Tack coat is then coated with another surface of substrate layer, then hot pressing laminating metal level on tack coat；
Finally after metal level printed wiring, serigraphy insulating barrier in the above.
Comparative example
A kind of metal piercing formula backboard used for solar batteries, includes insulating barrier, metal level, tack coat, substrate layer successively
And weathering layer, described weathering layer is coated on substrate layer by coating apparatus, and this weathering layer is fluororesin composition, and this contains
Fluorin resin composition includes based on quality 100%：
Fluorine resin 35%；
Aerosil 1%；
Titanium dioxide 10%；
Curing agent 4%；
Solvent 50 %.
Fluorine resin is vinylidene（PVDF）And vinylidene and alkyl vinyl ether（Ester）Copolymer, tetrafluoroethene
And tetrafluoroethene and alkyl vinyl ether（Ester）Copolymer.
This curing agent is hexamethylene diisocyanate.
This substrate layer is polyethylene terephthalate.
This tack coat is acrylic resin adhesive.
This metal level is nickel foil.
This insulating barrier is coated with the metal layer for epoxy resin ink by serigraphy, is then solidified into insulating barrier.
The thickness of this weathering layer is 23 m.
The preparation method of this metal piercing formula backboard used for solar batteries, comprises the steps：
Prepare fluororesin composition first, by modified fluorin resin 35%, aerosil 1%, titanium dioxide 10 %, solidification
Agent 4 % and solvent 50 % mixes；
Then pass through scraper for coating method, fluororesin composition is coated on a surface of substrate layer, through baking oven baking
Form weathering layer after solidification；
Tack coat is then coated with another surface of substrate layer, then hot pressing laminating metal level on tack coat；
Finally after metal level printed wiring, serigraphy insulating barrier in the above.
The test result of above characteristic is as follows：
Above-mentioned performance test is adopted with the following method：
(1) moisture-vapor transmission test is carried out using GB1037-1988 method, be shown in Table 2；
(2) adopt the open method of solar cell certification/solar photovoltaic cell panel IEC61215, to embodiment and comparative example
Tested, test condition is：85 DEG C of temperature, relative humidity 85%RH, more than time 1000hrs, glue surface has delamination, bubbles then
Unqualified；Conversely, it is qualified；
(3) using IEC61730-2/IEC60664-1 and ASTM D149-97a method, embodiment and comparative example are entered respectively
Row shelf depreciation and electrical breakdown test；
(4) resistance to ultraviolet test is carried out to embodiment and comparative example according to IEC61215-2005, GB/T16422.3-1997,
Glue surface has xanthochromia then unqualified；No xanthochromia is then qualified；
(5) according to standard GB/T/T 9286-1998《The cross cut test of paint and varnish paint film》Measure：
In sum, by the optimization design to weather-proof layer formula, make the prepared metal piercing formula back of the body used for solar batteries
Plate has relatively low moisture-vapor transmission and higher anti-electrical breakdown performance；Meanwhile, this backboard has stronger weatherability, anti-purple
Outside line and moisture-resistant hot property, are host wherein by using modified fluorin resin, and using of cooperation curing agent forms response type simultaneously
After mixture, its crosslink density is bigger, and obtained weathering layer has good tack to substrate layer, and this tack is to make
Can not be compared with non-modified fluorine resin.
The above, be only presently preferred embodiments of the present invention, not the technical scope of the present invention imposed any restrictions,
Therefore every technical spirit according to the present invention is to any trickle amendment made for any of the above embodiments, equivalent variations and modification, all still
Belong in the range of technical solution of the present invention.
Claims (1)
1. a kind of metal piercing formula backboard used for solar batteries preparation method it is characterised in that：
Prepare fluororesin composition first, by modified fluorin resin 25-50wt %, aerosil 1-5wt %, titanium dioxide
10-25 wt %, curing agent 1-10wt % and solvent 30-50wt % mix；Described modified fluorin resin be with carboxylic acid group,
Any one or more base in sulfonic group, aziridine base, NCO, epoxy radicals, amido, hydroxyl and active methylene group
Group is modified the copolymer of vinylidene, tetrafluoroethene, the homopolymers of hexafluoropropene or the two of which processing or three kinds；Gu
Agent is polyisocyanates；
Then pass through scraper for coating method, fluororesin composition is coated on a surface of substrate layer, through baking oven baking-curing
Form weathering layer afterwards；Substrate layer is by polyethylene terephthalate, polybutylene terephthalate (PBT) and poly- naphthalenedicarboxylic acid
One or more of glycol ester is formed；The thickness of weathering layer is 20 m ~ 25 m；
Tack coat is then coated with another surface of substrate layer, then hot pressing laminating metal level on tack coat；Finally in gold
After belonging to layer printed wiring, serigraphy insulating barrier in the above；Tack coat by epoxyn, saturated polyester adhesive,
One of polyurethane adhesive, acrylic resin adhesive or several mixtures are formed；Metal level be Copper Foil, aluminium foil or
Nickel foil；Insulating barrier is that epoxy resin ink, polyester resin ink or acrylic resin ink are coated on gold by serigraphy
Belong on layer, then solidify to form.
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| CN201310425762.1A CN103522658B (en) | 2013-09-18 | 2013-09-18 | Backboard for metal perforation type solar battery and preparation method of backboard |
Applications Claiming Priority (1)
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|---|---|---|---|
| CN201310425762.1A CN103522658B (en) | 2013-09-18 | 2013-09-18 | Backboard for metal perforation type solar battery and preparation method of backboard |
Publications (2)
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| CN103522658A CN103522658A (en) | 2014-01-22 |
| CN103522658B true CN103522658B (en) | 2017-02-15 |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6510760B2 (en) * | 2014-03-31 | 2019-05-08 | 株式会社神戸製鋼所 | Metal substrate |
| JP2020064954A (en) * | 2018-10-17 | 2020-04-23 | 大日本印刷株式会社 | Rear surface protective sheet for module for solar battery |
| CN113201270A (en) * | 2021-04-13 | 2021-08-03 | 信义光伏产业(安徽)控股有限公司 | High-reflection glaze, high-reflection back plate glass, and preparation methods and applications thereof |
| CN113690345A (en) * | 2021-10-25 | 2021-11-23 | 南京日托光伏新能源有限公司 | Efficient MWT component packaging method |
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| CN101177514A (en) * | 2007-11-08 | 2008-05-14 | 中国乐凯胶片集团公司 | Solar energy battery back board and preparation method thereof |
| US20110184116A1 (en) * | 2008-10-09 | 2011-07-28 | Asahi Glass Company, Limited | Aqueous coating composition and process for its production, and process for forming coating film |
| EP2357674A1 (en) * | 2008-12-08 | 2011-08-17 | Asahi Glass Company, Limited | Fluorine resin film and use thereof |
| CN102544161A (en) * | 2012-02-17 | 2012-07-04 | 常熟市冠日新材料有限公司 | Back plate for metal wrap through (MWT) solar battery |
| CN102615881A (en) * | 2012-03-27 | 2012-08-01 | 浙江华正新材料股份有限公司 | Back plate applied to back field passivation type solar cell and method for manufacturing back plate |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101177514A (en) * | 2007-11-08 | 2008-05-14 | 中国乐凯胶片集团公司 | Solar energy battery back board and preparation method thereof |
| US20110184116A1 (en) * | 2008-10-09 | 2011-07-28 | Asahi Glass Company, Limited | Aqueous coating composition and process for its production, and process for forming coating film |
| EP2357674A1 (en) * | 2008-12-08 | 2011-08-17 | Asahi Glass Company, Limited | Fluorine resin film and use thereof |
| CN102544161A (en) * | 2012-02-17 | 2012-07-04 | 常熟市冠日新材料有限公司 | Back plate for metal wrap through (MWT) solar battery |
| CN102615881A (en) * | 2012-03-27 | 2012-08-01 | 浙江华正新材料股份有限公司 | Back plate applied to back field passivation type solar cell and method for manufacturing back plate |
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