CN103072349A - Composite film for back plate of solar battery - Google Patents
Composite film for back plate of solar battery Download PDFInfo
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- CN103072349A CN103072349A CN2013100361325A CN201310036132A CN103072349A CN 103072349 A CN103072349 A CN 103072349A CN 2013100361325 A CN2013100361325 A CN 2013100361325A CN 201310036132 A CN201310036132 A CN 201310036132A CN 103072349 A CN103072349 A CN 103072349A
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- film
- solar battery
- rear board
- polyvinylidene fluoride
- battery rear
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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
The invention discloses a composite film for a back plate of a solar battery. The composite film for the back plate of the solar battery is composited by the following materials: an external protection layer, namely a 0.025-0.050 thick polyvinylidene fluoride film, a substrate, namely a 0.125-0.300 thick PET (polyethylene glycol terephthalate) film, and an internal protection layer, namely a 0.025-0.030 thick polyvinylidene fluoride film, wherein the both sides of the substrate are combined with the internal protection layer and the external protection layer respectively by bonding layers; the surface, bonded with the external protection layer, of the substrate (the PET film) is covered with a vacuum aluminum or silicon coating layer; and the bonding layers are polyurethane adhesive layers and 3-15 micrometers in thickness. The composite film is novel in structure, materials are easy to obtain, the water vapor and ultraviolet light blocking properties are improved, the bonding strength of the composite film with a packaging material of the solar battery is high, and the service life of the solar back plate is prolonged.
Description
Technical field:
Patent of the present invention relates to technical field of solar batteries, particularly a kind of compound film for solar battery rear board.
Background technology:
Earth environment pollutes and the energy shortage problem is on the rise, and solar cell power generation is one of effective way of these two problems of solution.Solar electrical energy generation is to utilize the semi-conductive quantum effect principles such as silicon directly the visible light of the sun to be changed into electric energy.But because it is in the face of atrocious weather, we need a kind of material protect silicon chip of solar cell, and we generally adopt glass to protect silicon chip in the face of the one side of sun direct projection, and reverse side, we adopt solar cell backboard protection.On this required, we required following characteristic:
At first, solar cell backboard will have very excellent weather resisteant, can resist atrocious weather; Secondly, solar cell backboard requires to have extraordinary UV absorption ability, and better protection is used for fixing silicon chip and EVA.In addition, solar cell backboard also must have low-down water vapor permeation rate, protects silicon chip therefore and the short circuit of making moist, and we also require the quality of solar cell backboard very light simultaneously, alleviate the quality that whole photovoltaic is set up.
At present, use fluorine-contained film, the solar cell backboard that adopts the coating combination process to produce, because properties of product are better, obtained the approval of most of companies, its main structure has the TPT structure that the TPE structure is arranged, wherein T refers to the Tadlar film of E.I.Du Pont Company, composition is the PVF(polyvinyl fluoride), P refers to PETG (PET) film, and E refers to ethylene-vinyl acetate resin (EVA), so the TPT structure refers to PVF film/PET film/PVF membrane structure, the TPE knot refers to that structure refers to PVF film/PET film/eva film structure, and three-layer thin-film is bonding with suitable bonding agent.The typical manufacturer of the backboard of TPT structure is the Isovolta company in Europe, the backboard of TPE structure is the patented product (seeing patent application WO2004/091901A2) of the Madico company of the U.S.. Japan's Aluminum, Austrian Isovotal and German Krempel company adopt PVDF (Kynoar) the film production solar cell backboard of French Arkema, be called for short the KPK backboard, i.e. PVDF film/PET film/PVDF membrane structure.
Fluorine film in the fluorine-containing type solar cell backboard is mainly by Tadlar film and the PVDF(Kynoar of du pont company) film, the market share of this two series products has accounted for all backboard industries 90%.Wherein the Tadlar film of E.I.Du Pont Company is the du pont company patented product, also only has E.I.Du Pont Company to solve the PVF(polyvinyl fluoride) the material melt temperature is than decomposing the high difficult point of temperature, and PVF commonly used is monopolized by du pont company in the world.
The PVDF material is a kind of of fluoroplastics, and fusing point is 170 degree, and density is 1.78 g/cms, be a kind of crystal type high polymer, degree of crystallinity is about 68%, the impact property of PVDF, tensile strength, wearability and creep resistant are best in the fluoroplastics commonly used basically, the anti-overwhelming majority's solvent.Serviceability temperature is-50 to 150 degree, and wider than the PVF scope of application, the PVDF weather resisteant is good, radiation hardness, and anti-ozone, ultraviolet resistance, dielectric properties are excellent, and dielectric constant is 8-9.Pvdf membrane and PVF(Tadl ar) film comparatively speaking, its weather resisteant can be better than PVF, film tension is a little less than PVF, but is more or less the same, the pvdf membrane surface tension is that 28, PVF is 31.
PET is the most cheap, but barrier extraordinary material again, and offshore company has all adopted this material of PET (perhaps its rank is biological, such as PBT) when making backboard, and just domestic, PET is the most ripe barrier material of domestic processing film.PET belongs to organic high molecular compound, is to be made of carbon, hydrogen, three kinds of elements of oxygen.Molecular structure is as follows: H-[OCH2CH2-OOC-CO-OHPET generally carries out direct esterification reaction or ester exchange reaction generation PET monomer, the PETG that forms through solid phase polycondensation again by terephthalic acid (TPA) (PTA) or dimethyl terephthalate (DMT) (DMT) with ethylene glycol (EG).Chemical equation is as follows: HOOC---COOH+2HOCH2CH2OH, catalyst alkali HO-CH2CH2-OOC---COO-CH2CH2OH+2H2O.Can find out that from the molecular structure characteristics of PET PET has very high chemical regularity and geometrical regularity, and have the ability of tight packing.So PET relatively other macromolecular materials has extremely low water vapour permeability, extremely low oxygen permeability, and excellent electrical property.The water vapor permeation rate is even more important, the long-term quality of low water vapor permeation rate guarantee backboard.Great majority are to use hydrolysis PET abroad, because the hydrolytic resistance of domestic PET is not all right, and the price of external PET thin-film material is than domestic will exceeding a lot, and buy more complicated, in order to save cost, before using domestic PET film, must do specially treated to its single face.
Summary of the invention:
In order to overcome the shortcoming of above-mentioned prior art, the present invention designs that a kind of cost is low, the steam barrier property is good, the compound film for solar battery rear board of good weatherability, thereby prolongs the service life of solar cell.
In order to realize above-mentioned task, the present invention takes following technical scheme:
A kind of compound film for solar battery rear board is composited by following trilaminate material: external protection: the polyvinylidene fluoride film that 0.025～0.050mm is thick; The PET film that base material: 0.125～0.30mm is thick; The polyvinylidene fluoride film that inner protective layer: 0.025～0.030mm is thick; Be combined with inner protective layer and external protection by tack coat respectively in the two sides of described base material, described base material is covered with vacuum aluminum-coated or the Vacuum Deposition silicon layer in the one side that bonds with external protection.
As the preferred embodiments of the present invention, described external protection is white polyvinylidene fluoride film, is that multi-layer co-extruded technique is made; formed the double-deck interface of polymethyl methacrylate+Kynoar; wherein, the consumption of described polymethyl methacrylate is 90%, and Kynoar is 10%.
As the preferred embodiments of the present invention, described external protection polyvinylidene fluoride film is at first to pass through the methyl methacrylate absorbing ultraviolet, intercepts by polyvinylidene fluoride film again.
As the preferred embodiments of the present invention, described inner protective layer is the polyvinylidene fluoride film of white, is that casting technique was made after methyl methacrylate and Kynoar mixed; the two-phase blending structure; wherein, the consumption of described polymethyl methacrylate is 30%, and Kynoar is 70%.
As the preferred embodiments of the present invention, described base material is the white PET film of biaxial tension.
As the preferred embodiments of the present invention, described base material is covered with vacuum aluminum-coated or the Vacuum Deposition silicon layer on the PET film surface that bonds with external protection.
As the preferred embodiments of the present invention, described thickness vacuum aluminum-coated or the Vacuum Deposition silicon layer is 0.035～0.040 μ m.
As the preferred embodiments of the present invention, described the first adhesive linkage and the second adhesive linkage are the polyurethane glue-lines.
As the preferred embodiments of the present invention, described the first adhesive linkage and the second adhesive linkage form by two component hot settings, comprise and contain resin and the curing agent that solidifies functional group, described curing functional group is amino or carboxyl, and described curing agent is isocyanate curing agent.
As the preferred embodiments of the present invention, described isocyanate curing agent is selected from hexamethylene diisocyanate and dimer thereof and tripolymer, MDI, 3-isocyanates methylene-3, a kind of in 5, the 5-3-methyl cyclohexanol based isocyanate.
As the preferred embodiments of the present invention, described the first tack coat and the second adhesive layer thickness are 5～15 μ m.
Compared with prior art; the present invention has the following advantages at least: composite membrane of the present invention adopts PVDF film/PET film/PVDF membrane structure; wherein, the PET film is base material, and the PVDF film of both sides is respectively external protection and inner protective layer; inner protective layer and external protection are combined with base material by tack coat respectively; wherein, the one side that base material is combined with external protection is covered with vacuum aluminum-coated or the Vacuum Deposition silicon layer, has improved the steam rejection rate; like this, improved the steam barrier property of whole composite membrane.
Description of drawings:
Fig. 1 is the structural representation of composite membrane of the present invention.
Wherein, 1 is that inner protective layer, 2 is that the first tack coat, 3 is that base material, 4 is vacuum aluminum-coated or Vacuum Deposition silicon layer, 5 is that the second tack coat, 6 is inner protective layer.
The specific embodiment:
For solving the problems of the technologies described above, the technical solution used in the present invention is as follows:
A kind of compound film for solar battery rear board, it comprises both weathering layers of base material 3, inner protective layer 1(), both weathering layer of external protection 6(), the first tack coat 2 and the second tack coat 5.
Described base material 3 is silicon modifications; the domestic PET film of biaxial tension; described base material has improved the steam rejection rate vacuum aluminum-coated or Vacuum Deposition silicon is formed with vacuum aluminum-coated or Vacuum Deposition silicon layer 4 through single face with the one side of external protection bonding, and the present invention adopts vacuum aluminum-coated.Described base material 3 is PET biaxially oriented laminated films, has extremely low oxygen permeability, and excellent electrical property, and thickness is 0.125～0.300mm, white, and in example of the present invention, described pet layer thickness is 250 μ m.
Described the first and second tack coats all are two-component polyurethane adhesive layers, and this adhesive linkage is formed by two component hot settings, comprise to contain resin and the curing agent that solidifies functional group.Described resin matrix is polyurethane series, and described curing functional group is amino, carboxyl.Described curing agent is from isocyanate curing agent.Described adhesive layer thickness is 5～15 μ m, and in example of the present invention, described thickness of adhibited layer is 10 μ m.
Described isocyanate curing agent generally comprises: hexamethylene diisocyanate (HDI) and dimer thereof, tripolymer, MDI (MDI), 3-isocyanates methylene-3,5,5-3-methyl cyclohexanol based isocyanate (IPDI) etc.From hypotoxicity and xanthochromia consideration, the preferred toluene di-isocyanate(TDI) of the present invention (TDI).
Described external protection 6 is white polyvinylidene fluoride films, it is the PVDF layer, Main Function is weather-proof, intercepts steam and oxygen, anti-uv-ray, vacuum aluminum-coated or the Vacuum Deposition silicon face bonding with base material, thickness is the PMMA(90% of 0.025～0.050mm)+PVDF(10%) mixture, be that multi-layer co-extruded technique is made, formed the double-deck interface of polymethyl methacrylate+Kynoar, in example of the present invention, described external protection thickness is 50 μ m; At first by the PMMA absorbing ultraviolet, reach the purpose of obstruct by PVDF, this one deck is as solar cell backboard and contact with air layer again, and its requirement is very high, and this layer satisfies following parameter:
1. extremely outstanding oxidation resistance;
2. extremely outstanding uvioresistant ability;
3. extremely outstanding ultraviolet absorption ability;
4. more outstanding water vapour rejection rate (protection base material).
Described inner protective layer is the polyvinylidene fluoride film of white; it is the PVDF layer; direct and substrate surface bonds; Main Function is weather-proof, intercepts steam and oxygen, anti-uv-ray; has reasonable cohesion with the first tack coat; thickness is the PMMA(30% of 0.025～0.030mm)+PVDF(70%) mixture, be the PMMA(polymethyl methacrylate) and the PVDF(Kynoar) mix after casting technique make the two-phase blending structure.In example of the present invention, described inner protective layer thickness is 30 μ m, and described inner protective layer is faced the direct projection of sunshine, but does not directly contact with air, to above condition, so this layer is satisfied following parameter:
1. surface tension is larger, should reach more than 45, makes it easily to bond with EVA, and best and EVA bonding surface has nonpolar molecule;
2. has extremely outstanding anti-uv-ray;
3. has extremely outstanding ultraviolet absorption ability;
4. has general oxidation resistance;
5.90 above whiteness (light emission);
6. has reasonable cohesive force with the EVA gluing layer.
As a kind of example of the present invention, each layer color and thickness such as following table:
| ? | Material | Thickness (μ m) | |
| 1 | PVDF | 50 | White |
| 2 | Polyurethane adhesive | 10 | Milky white |
| 3 | Aluminium coated | 0.04 | Metallochrome |
| 4 | PET | 250 | White |
| 5 | Polyurethane adhesive | 10 | Milky white |
| 6 | PVDF | 25 | White |
In the upper table, the PVDF layer of described inner protective layer 1 and as the test adhesion strength between the PET of base material 3 greater than 20N/5cm, method of testing is standard I PV EN60674.
The PVDF layer of described inner protective layer 1 and the test adhesion strength between the first tack coat are greater than 30N/10mm, and method of testing is standard GB/T2792-1998.
The invention has the advantages that:
1. compound film for solar battery rear board of the present invention adopts PVDF film/PET film/PVDF membrane structure, has excellent weatherability, oxidation resistance, water vapour rejection rate.
2. solar cell backboard of the present invention adopts domestic PET film as base material, has reduced cost, is undertaken vacuum aluminum-coated or the processing of Vacuum Deposition silicon by the PET film surface that external protection is bondd, and has improved the steam rejection rate.
3. external protection has adopted two kinds of pvdf membranes that various processes is made in the solar cell backboard of the present invention; brought into play advantage separately at interior external protection, improved solar cell backboard weatherability, oxidation resistance, water vapour rejection rate, had better cohesive force with the EVA gluing layer.
4. solar cell backboard of the present invention adopts two-component polyurethane adhesive as the first and second tack coats, has excellent weatherability and caking property firmly.
To sum up, solar cell backboard cost of the present invention is low, and has improved weatherability, oxidation resistance, water vapour rejection rate, has reasonable cohesive force with the EVA gluing layer, thereby has further prolonged the service life of solar module.
Above content is the further description of the present invention being done in conjunction with concrete preferred embodiment; can not assert that the specific embodiment of the present invention only limits to this; without departing from the inventive concept of the premise; the simple deduction or replace of making all should be considered as belonging to the present invention and determine scope of patent protection by claims of submitting to.
Claims (10)
1. compound film for solar battery rear board is characterized in that: be composited by following trilaminate material:
The polyvinylidene fluoride film that external protection: 0.025～0.050mm is thick;
The PET film that base material: 0.125～0.30mm is thick;
The polyvinylidene fluoride film that inner protective layer: 0.025～0.030mm is thick;
Be combined with inner protective layer and external protection by the first tack coat and the second tack coat respectively in the two sides of described base material, described base material is covered with vacuum aluminum-coated or the Vacuum Deposition silicon layer in the one side that bonds with external protection.
2. compound film for solar battery rear board as claimed in claim 1; it is characterized in that: described external protection is white polyvinylidene fluoride film; that multi-layer co-extruded technique is made; formed the double-deck interface of polymethyl methacrylate+Kynoar; wherein; in polyvinylidene fluoride film, the consumption of described polymethyl methacrylate is 90%, and Kynoar is 10%.
3. compound film for solar battery rear board as claimed in claim 1 or 2 is characterized in that: described external protection polyvinylidene fluoride film is at first by the methyl methacrylate absorbing ultraviolet, intercepts by polyvinylidene fluoride film again.
4. compound film for solar battery rear board as claimed in claim 1; it is characterized in that: described inner protective layer is the polyvinylidene fluoride film of white; that casting technique was made after methyl methacrylate and Kynoar mixed; the two-phase blending structure; wherein; the consumption of described polymethyl methacrylate is 30%, and Kynoar is 70%.
5. compound film for solar battery rear board as claimed in claim 1, it is characterized in that: described base material is the white PET film of biaxial tension.
6. compound film for solar battery rear board as claimed in claim 1, it is characterized in that: described thickness vacuum aluminum-coated or the Vacuum Deposition silicon layer is 0.035～0.040 μ m.
7. compound film for solar battery rear board as claimed in claim 1, it is characterized in that: described the first adhesive linkage and the second adhesive linkage are the polyurethane glue-lines.
8. compound film for solar battery rear board as claimed in claim 7, it is characterized in that: described the first adhesive linkage and the second adhesive linkage form by two component hot settings, comprise and contain resin and the curing agent that solidifies functional group, described resin matrix is polyurethane series, described curing functional group is amino or carboxyl, and described curing agent is isocyanate curing agent.
9. compound film for solar battery rear board as claimed in claim 8, it is characterized in that: described isocyanate curing agent is selected from hexamethylene diisocyanate and dimer thereof and tripolymer, MDI, 3-isocyanates methylene-3, a kind of in 5, the 5-3-methyl cyclohexanol based isocyanate.
10. such as claim 7 or 8 or 9 described compound film for solar battery rear board, it is characterized in that: described the first tack coat and the second adhesive layer thickness are 5～15 μ m.
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104409540A (en) * | 2014-10-24 | 2015-03-11 | 无锡中洁能源技术有限公司 | Modified polyurethane solar cell backboard and preparation method thereof |
| CN104465886A (en) * | 2014-12-26 | 2015-03-25 | 苏州幸福新能源科技有限责任公司 | Production process for KPK structure double-face compounding backboard |
| WO2015149417A1 (en) * | 2014-03-31 | 2015-10-08 | 韩华新能源（启东）有限公司 | Photovoltaic module applied to desert areas and tropical areas |
| CN107887468A (en) * | 2017-11-24 | 2018-04-06 | 谢育枝 | A kind of solar energy backboard |
| CN108172653A (en) * | 2018-01-19 | 2018-06-15 | 中天科技精密材料有限公司 | A kind of PVDF thin film of high reflectance and preparation method thereof, application |
| CN108198886A (en) * | 2018-01-19 | 2018-06-22 | 中天科技精密材料有限公司 | A kind of corrosion resistant PVDF thin film of high reflectance and preparation method thereof, application |
| CN108215402A (en) * | 2016-12-22 | 2018-06-29 | 上海海优威新材料股份有限公司 | Halogen photovoltaic back and preparation method thereof |
| CN108365038A (en) * | 2018-02-15 | 2018-08-03 | 湖南辰砾新材料有限公司 | A kind of solar cell backboard film and preparation method thereof |
| CN109664580A (en) * | 2018-12-26 | 2019-04-23 | 汉能移动能源控股集团有限公司 | Solar cell composite back plate and preparation process thereof |
| CN109733029A (en) * | 2018-12-29 | 2019-05-10 | 南京君弘新材料有限公司 | One kind is transparent to turn photoreactivation film and preparation method thereof |
| CN111320947A (en) * | 2020-03-16 | 2020-06-23 | 广东新辉化学有限公司 | Solar backboard laminating adhesive and film preparation method thereof |
| CN114516969A (en) * | 2020-11-19 | 2022-05-20 | 银金达(上海)新材料有限公司 | Solar cell backboard with high weather resistance and excellent comprehensive performance |
| CN115820146A (en) * | 2021-12-31 | 2023-03-21 | 浙江中聚材料有限公司 | High-barrier photovoltaic back plate and preparation method and application thereof |
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Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2015149417A1 (en) * | 2014-03-31 | 2015-10-08 | 韩华新能源（启东）有限公司 | Photovoltaic module applied to desert areas and tropical areas |
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| CN108198886A (en) * | 2018-01-19 | 2018-06-22 | 中天科技精密材料有限公司 | A kind of corrosion resistant PVDF thin film of high reflectance and preparation method thereof, application |
| CN108172653A (en) * | 2018-01-19 | 2018-06-15 | 中天科技精密材料有限公司 | A kind of PVDF thin film of high reflectance and preparation method thereof, application |
| CN108365038A (en) * | 2018-02-15 | 2018-08-03 | 湖南辰砾新材料有限公司 | A kind of solar cell backboard film and preparation method thereof |
| CN108365038B (en) * | 2018-02-15 | 2019-12-10 | 湖南辰砾新材料有限公司 | Solar cell back panel film and preparation method thereof |
| CN109664580A (en) * | 2018-12-26 | 2019-04-23 | 汉能移动能源控股集团有限公司 | Solar cell composite back plate and preparation process thereof |
| CN109664580B (en) * | 2018-12-26 | 2023-10-03 | 东君新能源有限公司 | Solar cell composite backboard and preparation process thereof |
| CN109733029A (en) * | 2018-12-29 | 2019-05-10 | 南京君弘新材料有限公司 | One kind is transparent to turn photoreactivation film and preparation method thereof |
| CN111320947A (en) * | 2020-03-16 | 2020-06-23 | 广东新辉化学有限公司 | Solar backboard laminating adhesive and film preparation method thereof |
| CN114516969A (en) * | 2020-11-19 | 2022-05-20 | 银金达(上海)新材料有限公司 | Solar cell backboard with high weather resistance and excellent comprehensive performance |
| CN115820146A (en) * | 2021-12-31 | 2023-03-21 | 浙江中聚材料有限公司 | High-barrier photovoltaic back plate and preparation method and application thereof |
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Application publication date: 20130501 |