CN101290950B - Back film of solar cell and preparing technique thereof - Google Patents
Back film of solar cell and preparing technique thereof Download PDFInfo
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- CN101290950B CN101290950B CN 200810062077 CN200810062077A CN101290950B CN 101290950 B CN101290950 B CN 101290950B CN 200810062077 CN200810062077 CN 200810062077 CN 200810062077 A CN200810062077 A CN 200810062077A CN 101290950 B CN101290950 B CN 101290950B
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- fluoropolymer coating
- solar cell
- back film
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- 238000000034 method Methods 0.000 title abstract description 24
- 239000004446 fluoropolymer coating Substances 0.000 claims abstract description 52
- 238000000576 coating method Methods 0.000 claims abstract description 32
- 239000011248 coating agent Substances 0.000 claims abstract description 30
- 229920002799 BoPET Polymers 0.000 claims abstract description 28
- 239000002994 raw material Substances 0.000 claims abstract description 19
- 239000002904 solvent Substances 0.000 claims abstract description 18
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 15
- 239000003431 cross linking reagent Substances 0.000 claims abstract description 14
- 238000004519 manufacturing process Methods 0.000 claims abstract description 14
- 239000000853 adhesive Substances 0.000 claims description 33
- 230000001070 adhesive effect Effects 0.000 claims description 33
- 239000011159 matrix material Substances 0.000 claims description 31
- 125000001153 fluoro group Chemical group F* 0.000 claims description 22
- 239000000945 filler Substances 0.000 claims description 18
- 229920002620 polyvinyl fluoride Polymers 0.000 claims description 16
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 14
- 239000000049 pigment Substances 0.000 claims description 14
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims description 13
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- OHBRHBQMHLEELN-UHFFFAOYSA-N acetic acid;1-butoxybutane Chemical compound CC(O)=O.CCCCOCCCC OHBRHBQMHLEELN-UHFFFAOYSA-N 0.000 claims description 4
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- 229920001577 copolymer Polymers 0.000 claims description 4
- 238000004132 cross linking Methods 0.000 claims description 4
- 239000004408 titanium dioxide Substances 0.000 claims description 4
- YEJRWHAVMIAJKC-UHFFFAOYSA-N 4-Butyrolactone Chemical compound O=C1CCCO1 YEJRWHAVMIAJKC-UHFFFAOYSA-N 0.000 claims description 3
- DKPFZGUDAPQIHT-UHFFFAOYSA-N Butyl acetate Natural products CCCCOC(C)=O DKPFZGUDAPQIHT-UHFFFAOYSA-N 0.000 claims description 3
- SECXISVLQFMRJM-UHFFFAOYSA-N N-Methylpyrrolidone Chemical compound CN1CCCC1=O SECXISVLQFMRJM-UHFFFAOYSA-N 0.000 claims description 3
- TZCXTZWJZNENPQ-UHFFFAOYSA-L barium sulfate Chemical compound [Ba+2].[O-]S([O-])(=O)=O TZCXTZWJZNENPQ-UHFFFAOYSA-L 0.000 claims description 3
- 239000010941 cobalt Substances 0.000 claims description 3
- 229910017052 cobalt Inorganic materials 0.000 claims description 3
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 claims description 3
- FUZZWVXGSFPDMH-UHFFFAOYSA-N hexanoic acid Chemical compound CCCCCC(O)=O FUZZWVXGSFPDMH-UHFFFAOYSA-N 0.000 claims description 3
- 150000002527 isonitriles Chemical class 0.000 claims description 3
- MOUPNEIJQCETIW-UHFFFAOYSA-N lead chromate Chemical compound [Pb+2].[O-][Cr]([O-])(=O)=O MOUPNEIJQCETIW-UHFFFAOYSA-N 0.000 claims description 3
- 229940088417 precipitated calcium carbonate Drugs 0.000 claims description 3
- 235000012239 silicon dioxide Nutrition 0.000 claims description 3
- 239000000377 silicon dioxide Substances 0.000 claims description 3
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- 239000010410 layer Substances 0.000 abstract description 26
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- 238000000227 grinding Methods 0.000 abstract description 2
- 239000000758 substrate Substances 0.000 abstract 3
- KRHYYFGTRYWZRS-UHFFFAOYSA-M Fluoride anion Chemical compound [F-] KRHYYFGTRYWZRS-UHFFFAOYSA-M 0.000 abstract 1
- 239000004816 latex Substances 0.000 abstract 1
- 229920000126 latex Polymers 0.000 abstract 1
- 239000010408 film Substances 0.000 description 49
- 239000000047 product Substances 0.000 description 18
- 239000004810 polytetrafluoroethylene Substances 0.000 description 14
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 14
- 239000002033 PVDF binder Substances 0.000 description 9
- 230000000694 effects Effects 0.000 description 8
- 230000008569 process Effects 0.000 description 8
- 239000004576 sand Substances 0.000 description 8
- 229920002981 polyvinylidene fluoride Polymers 0.000 description 7
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 6
- 239000011737 fluorine Substances 0.000 description 6
- 229910052731 fluorine Inorganic materials 0.000 description 6
- 239000002245 particle Substances 0.000 description 6
- 238000003801 milling Methods 0.000 description 4
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- MWUXSHHQAYIFBG-UHFFFAOYSA-N Nitric oxide Chemical compound O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 3
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- 238000011161 development Methods 0.000 description 3
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- 229920000139 polyethylene terephthalate Polymers 0.000 description 3
- 239000005020 polyethylene terephthalate Substances 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 239000004593 Epoxy Substances 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 229910004298 SiO 2 Inorganic materials 0.000 description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 2
- 230000015556 catabolic process Effects 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
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- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
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Images
Classifications
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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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- Paints Or Removers (AREA)
- Laminated Bodies (AREA)
- Photovoltaic Devices (AREA)
Abstract
The invention discloses a solar panel back film and a technique for manufacturing the same. The back film comprises a PET film substrate with thickness of between 100 and 350 micrometers, wherein, fluoropolymer coatings with thickness of between 15 and 30 micrometers are coated on both sides of the substrate; an adhesive layer with thickness of between 0.5 and 5 micrometers is coated on the fluoropolymer coating on one side; the fluoropolymer coatings are obtained by direct coating of mixed latex which is obtained through mixture of various raw material compositions according to the mixture ratio and subsequent grinding treatment on the PET film substrate; the compositions by mass ratio of the raw materials of the fluoropolymer coatings are 30 to 55 percent of fluoride coating materials, 20 to 40 percent of solvent, 2 to 6 percent of cross-linking agent and curing agent and 15 to 40 percent of filling. The technique greatly improves the bonding strength between a back film layer and a layer, improves the ageing resistance, the weathering resistance of products, simultaneously improves the insulativity and the vapor permeability resistance due to the design of a multilayered structure and also can design and modify the performance and the appearance of the products as required.
Description
(1) technical field
The present invention relates to a kind of back film of solar cell and production technology thereof.
(2) background technology
The energy is the basis of modern society's production and social activities.Traditional fuel energy reduces day by day, faces exhausted danger.On the other hand, the carbon dioxide that fuel combustion emits, sulphur and nitrogen oxide can cause greenhouse effect and acid rain, worsen earth environment.Energy problem has become the global problem that can not be ignored.Seek new forms of energy, become the task of top priority.And abundant solar radiant energy is inexhaustible, nexhaustible, is the energy that the mankind can freely utilize, and becomes people's optimal selection.If 0.1% of the solar energy of earth surface is changed into electric energy, number turnover is 5%, and annual energy output is equivalent to about 40 times of present energy consumption in the world.
When non-renewable energy resources such as electric power, coal, oil signal for help repeatedly, when energy problem became the bottleneck of restriction international community economic development day by day, more and more countries came into effect " sunlight program ", and the exploitation solar energy resources is sought the new power of economic development.Some high-caliber nuclear research institutions of Europe also begin to turn to regenerative resource.Under the promotion of international photovoltaic market great potential, the solar cell manufacturing industry of various countries falls over each other to drop into huge fund, enlarges to produce, to strive one seat.
Simple in structure, advantages such as volume is little, easy installation and maintenance, the construction period is short, clean and safe is pollution-free, reliability is high, the life-span is long, applied range that solar cell has, it forms structure as shown in Figure 1, is made up of low iron toughened glass, silicon chip, adhesive (EVA glue) and several major parts of notacoria.And solar battery back film is mainly used in the encapsulation of solar cell, has insulation (anti-electrical breakdown), the influence of ageing-resistant, weather and characteristic such as corrosion-resistant, so notacoria generally all is to make by several macromolecular materials are compound.The market scale of solar cell package notacoria is about 500,000,000 dollars, increases rapidly along with the development of solar cell industry simultaneously.
There are Du Pont, Minnesota Mining and Manufacturing Company, Britain Krempel company, Japanese SolarPET, Austrian ISOVOLTA etc. in the main supplier of solar cell package notacoria in the world.The notacoria product is produced [Carl P.Fernandez, Robert F.Davis, Barrier laminate, US patent:6319596B1,2001] by the hot-forming mode of multilayer film mostly.Product with maximum in the world solar battery back film manufacturer E.I.Du Pont Company is an example.Its major product is that three layers independently film is hot-forming by the bonding of glue with PVF/PET/PVF.With PET film (PETG polymeric membrane) as matrix, main plaing a part insulated and supports, polyvinyl fluoride PVF (Polyvinylfluorid) film contains fluorin radical owing on the molecular skeleton, so have ageing-resistant preferably and corrosion resistant effect.
But, adopt heat pressing process to cause the bonding strength between thin layer and the layer not enough easily, cause bubble to retain easily between layer and the layer simultaneously, in using for a long time, gas, salt fog, some pollutants can permeate and corrode to the centre along the edge of film, thereby cause thin layer owing to wearing out of glue causes peeling off between layer and the layer, cause the decline of solar cell weather, UV resistant and insulating properties, thereby influence the life-span of solar cell.Simultaneously, when adopting heat pressing process, the kind of fluoro-containing macromolecule material film is less relatively, selectable leeway is less, therefore, E.I.Du Pont Company has also applied for adopting technology patent [the Debergalis and Michael of the method production fluorine-containing coat of application in 2006, Fluoropolymer coated films usefulfor photovoltaic modules, US patent applicaiton:20070154704,2007], adopt sandwich structure, cover two-layer fluorine-containing coat, thickness 2.5-50um on the matrix.Fluoropolymer layer is by 60% (mol ratio) above fluorochemical monomer or copolymer, and 40% following adhesive composition, can add filler and pigment, does not disclose concrete technological parameter in this application.
(3) summary of the invention
The technical problem to be solved in the present invention is single at existing back film of solar cell structure, bonding strength between thin layer and the layer is not enough, simultaneously layer with layer between defective such as cause that bubble retains easily, a kind of new back film of solar cell and production technology thereof are provided.
Back film of solar cell of the present invention comprises the PET film matrix of thickness 100～350 μ m, and described matrix coated on both sides has the fluoropolymer coating of 15～30 μ m, wherein is coated with the adhesive phase A of 0.5～5 μ m on the one side fluoropolymer coating; Described fluoropolymer coating is mixed by proportioning by each raw material components after the mixed emulsion that sanded obtains directly is coated on the PET film matrix obtains, and the raw material of described fluoropolymer coating comprises the component of following quality proportioning:
Fluoro-containing coating 30～55%
Solvent 20～40%
Crosslinking agent and curing agent 2～6%
Filler 15～40%;
Described fluoro-containing coating is mainly the fluoro containing polymers resin, and described fluoro containing polymers resin can be selected from following one or more mixing: polyvinyl fluoride PVF (Polyvinylfluorid), Kynoar PVDF (Polyvinylidene fluoride), polytetrafluoroethylene PTFE (Polytetrafluoroethylene), perfluoroethylene-propylene, fluorubber (PFA), chlorotrifluoroethylene-alkyl vinyl ether co-polymer and other fluorine resins.The fluoro containing polymers resin mainly plays film forming and cross-linked polymeric in the raw material of fluoropolymer coating; Preferably, Kynoar and polytetrafluoroethylene are better than polyvinyl fluoride as the insulation property of body material.
Described solvent is recommended as following one or more mixing: dimethylbenzene, n-butanol, butyl acetate, propylene glycol monomethyl ether, monobutyl ether acetate, methyl pyrrolidone.Solvent is mainly as the fluoro containing polymers dissolving resin.
Described crosslinking agent and curing agent are following one or more mixing: mylar, many isocyanide esters, amino resins, epoxy resin, Lauxite, gamma-butyrolacton.Main and the fluoro-containing coating of crosslinking agent and curing agent plays crosslinking curing.
Described filler is following one or more mixing: titanium dioxide (TiO
2), silicon dioxide (SiO
2), ultra-fine barium sulfate (BaSO
4), precipitated calcium carbonate (CaCO
3).The main effect of filler is in order to strengthen the intensity of fluoropolymer coating.The present invention recommends to select for use the filler of particle diameter in 5 nanometers-30 micron.
Further, the raw material of described fluoropolymer coating is made up of the component of following quality proportioning basically:
Fluoro-containing coating 30～55%
Solvent 20～40%
Crosslinking agent and curing agent 2～6%
Filler 15～40%
Described " basically " is meant that the raw material of described fluoropolymer coating is except said components, can also add some auxiliary agents and/or pigment etc. according to concrete needs, such as according to the specific requirement of client to outward appearance and color and luster, the present invention can add various pigment in the raw material of fluoropolymer coating, described pigment can be carbon black, cobalt blue, chrome yellow, titanium dioxide, iron oxide etc.At this moment, the raw material of described fluoropolymer coating is made up of the component of following quality proportioning:
Fluoro-containing coating 30～55%
Solvent 20～40%
Crosslinking agent and curing agent 2～6%
Filler 15～40%
Pigment 0.5～2%
Notacoria of the present invention applies extremely thin adhesive phase A on fluoropolymer coating, be in order to improve the adhesion strength of notacoria and EVA glue, the adhesive that described adhesive phase uses can be EVA glue, acrylic resin, epoxy resin, polyurethane or their modifier, as modified epoxy.
Preferably, can also apply the adhesive phase B of one deck 1～3 μ m between the matrix of notacoria of the present invention and the fluoropolymer coating, described adhesive mainly adopts EVA glue, acrylic resin, polyurethane, epoxy resin or their modifier.Insulating properties and anti-water vapour permeability that adhesive phase can improve notacoria are set, and the bonding strength of strengthening matrix and fluoropolymer coating.
The present invention is in order to obtain better painting effect, after mixing, each raw material components of described fluoropolymer coating need carry out sanded, until forming good leveling property, fineness, then the mixed emulsion that obtains directly is coated on the PET film matrix less than 25 microns, the mixed emulsion of modest viscosity.
The invention provides a kind of production technology of above-mentioned back film of solar cell, described technology comprises the steps:
(1) the PET film matrix is carried out preliminary treatment;
(2) after being mixed by proportioning, each raw material components of described fluoropolymer coating carries out sanded, form good leveling property, fineness less than 25 microns, the mixed emulsion of modest viscosity, directly be coated in through on the pretreated PET film matrix, obtain the fluoropolymer coating of 15～30 μ m then 50～200 ℃ of crosslinking curing film forming;
(3) be coated with the adhesive phase A that is covered with 0.5～5 μ m on the one side fluoropolymer coating therein, make described back film of solar cell.
Concrete, before the preparation notacoria, want to carry out preliminary treatment to the PET film matrix earlier, preliminary treatment can comprise deoils and destatics processing: at first with surfactant the PET film matrix is carried out surface degreasing and handle, clean up with the activating agent of deionized water with matrix surface then.To destatic processing through the matrix after the oil removal treatment.Destatic the method that can adopt static bruss.Generally speaking, those skilled in the art can select pretreatment mode and step voluntarily according to the surface appearance and the actual process needs of matrix, or pre-treatment step is simplified or omitted.
In above-mentioned steps (2), those skilled in the art can select each raw material components and the consumption proportion of fluoropolymer coating according to actual needs, as whether adding pigment and/or auxiliary agent etc.After raw material mixes, need carry out sanded and form good leveling property, fineness is less than 25 microns, the mixed emulsion of modest viscosity can adopt fineness scraper plate instrument to detect fineness and levelability in the sand grinding process, can also adopt means such as viscosity apparatus, ESEM to detect treatment effect.The general control sand milling time is 0.5～1 hour.
The painting method of step (2) preparation fluoropolymer coating has silk screen printing, spraying, roller coating, blade coating, showering etc.The coating of this fluoropolymer coating can once be finished on the two sides, perhaps finish the one side after apply another side again.Need after coating is finished to carry out dry solidification, make solvent evaporates, till the film bone dry solidifies at 50～200 ℃.Be 1～30 minute curing time.
The coating method of step (3) adhesive phase A can adopt: spraying, roller coating or blade coating.After finishing, coating is drying to obtain described back film of solar cell at high temperature (as 50～150 ℃).
Preferably, the present invention can be coated with earlier on PET film matrix two sides and be covered with the thick adhesive phase B of 1～5 μ m, and described adhesive adopts EVA glue, acrylic resin, polyurethane, epoxy resin or their modifier.The coating process of this adhesive coating has spraying, roller coating, blade coating etc., applies to finish after high temperature (as 50～150 ℃) drying is used for notacoria production, then applies fluoropolymer coating on adhesive phase B.
The concrete production technology of described back film of solar cell of recommending is carried out according to following steps:
(1) elder generation deoils to the PET film matrix and destatics processing;
(2) the thick adhesive phase B of 1～5 μ m on the PET film matrix coated on both sides after step (1) is handled;
(3) after being mixed by proportioning, each raw material components of described fluoropolymer coating carries out sanded, form good leveling property, fineness is less than 25 microns, the mixed solution of modest viscosity, directly be coated in the film two sides that step (2) obtains, obtain the fluoropolymer coating of 15～30 μ m then 50～200 ℃ of crosslinking curing film forming;
(4) film that obtains in step (3) wherein simultaneously is coated with the adhesive phase A that is covered with 0.5～5 μ m.
The present invention also provides a kind of fluoropolymer coating composition that is used to prepare back film of solar cell, and described fluoropolymer coating composition comprises the component of following quality proportioning:
Fluoro-containing coating 30～55%
Solvent 20～40%
Crosslinking agent and curing agent 2～6%
Filler 15～40%;
Described fluoro-containing coating mainly is the fluoro containing polymers resin, and the fluoro containing polymers resin can be selected from following one or more mixing: polyvinyl fluoride PVF (Polyvinylfluorid), Kynoar PVDF (Polyvinylidene fluoride), polytetrafluoroethylene PTFE (Polytetrafluoroethylene), perfluoroethylene-propylene, fluorubber (PFA), chlorotrifluoroethylene-alkyl vinyl ether co-polymer and other fluorine resins;
Described solvent is following one or more mixing: dimethylbenzene, n-butanol, butyl acetate, propylene glycol monomethyl ether, monobutyl ether acetate, methyl pyrrolidone;
Described crosslinking agent and curing agent are following one or more mixing: mylar, many isocyanide esters, amino resins, epoxy resin, Lauxite, gamma-butyrolacton.
Described filler is following one or more mixing: titanium dioxide (TiO
2), silicon dioxide (SiO
2), ultra-fine barium sulfate (BaSO
4), precipitated calcium carbonate (CaCO
3).The main effect of filler is in order to strengthen the intensity of fluoropolymer coating.
Further, described fluoropolymer coating composition is made up of the component of following quality proportioning basically:
Fluoro-containing coating 30～55%
Solvent 20～40%
Crosslinking agent and curing agent 2～6%
Filler 15～40%
Described " basically " is meant described fluoropolymer coating composition except said components, can also add some auxiliary agents and/or pigment etc. according to concrete needs, and this is also within protection scope of the present invention.Such as, the component of described fluoropolymer coating composition can comprise various pigment, described pigment can be carbon black, cobalt blue, chrome yellow, titanium dioxide, iron oxide etc.Described fluoropolymer coating composition is made up of the component of following quality proportioning:
Fluoro containing polymers resin 30～55%
Solvent 20～40%
Crosslinking agent and curing agent 2～6%
Filler 15～40%
Pigment 0.5～2%
Compared with prior art, beneficial effect of the present invention is mainly reflected in following several respects:
1, the present invention adopts the method for direct application, whole film forming to prepare notacoria, PET matrix film is through after oil removing and destaticing processing, directly the fluid with compositions such as fluoro-containing coating, solvent, crosslinking agent, curing agent, fillers is coated in the matrix film surface, have good viscosity and levelability, so just formed an integral body with the PET matrix, avoided bubble and adhesion problem between layer and the layer, the bond strength between layer and the layer increases substantially.Because the raising of bond strength between layer and the layer, the ageing-resistant performance of product and weather-resistant property aspect all improve.
2, the present invention adopts sandwich construction design, can be in the opinion coated with adhesive layers of matrix and fluoropolymer coating, and improving the insulating properties and the anti-water vapour permeability of notacoria, and the bonding strength of strengthening matrix and fluoropolymer coating.
3,, can be at any time design and transform according to client's demand performance and outward appearance to product because the technology that adopts fluid to apply.As in order to improve the weatherability of product, can adopt PVDF, PTFE replaces PVF, can improve the performance of product so greatly.In some specific occasions, solar cell is in order to adapt to the needs of surrounding environment, such as garden Landscape Lamp, street lamp etc., can be according to the color of client's specified modulation product, in solution, add specific pigment and filler, make the color and the environmental harmony of product, satisfy the demand of client's personalization.
(4) description of drawings
Fig. 1 is the solar battery structure schematic diagram.
Fig. 2 is the structural representation of the back film of solar cell that makes of embodiment 2.
Fig. 3 is the structural representation of the back film of solar cell that makes of embodiment 1.
Fig. 4 is the surface topography map after the back film of solar cell product that makes of embodiment 1 amplifies.
Fig. 5 is the surface topography map of the back film of solar cell product of offshore company's production.
Each number designation representative: 1. glass, 2. silicon chip, 3. adhesive (EVA), 4. notacoria, 5. PET film matrix, 6. fluoropolymer coating, 7. adhesive phase A, 8. adhesive phase B.
(5) embodiment:
Below with specific embodiment technical scheme of the present invention is described, but protection scope of the present invention is not limited thereto:
Is that the PET film surface of 150 μ m is handled with surfactant to thickness, uses washed with de-ionized water then, and to remove the greasy dirt of film surface, the oven dry back is standby.
Polycrystalline epoxy resin is melted at 80-100 ℃, and the method that adopts roller coating is about 2 μ m in treated pet sheet face application layer of adhesive at 150 ℃ of dried thickness.
With polyvinyl fluoride (PVF) particle, propylene glycol monomethyl ether, amino resins and titanium dioxide (TiO
2) in 35: 30: 5: 30 ratio, in the bead sand mill, evenly mix, sand milling 0.5 hour, form good leveling property, fineness less than 25 microns, the mixed solution of modest viscosity, be heated to 170 degrees centigrade then, adopt method application one deck fluoropolymer coating on the process PET film of adhesive treatment of roller coating.Through 10 minutes baking, form film after the solvent evaporates in the fluoropolymer coating under 170 degrees centigrade temperature, the thickness of this film is about 20 μ m.
If adopt the mode of single face application, repeat above-mentioned fluoropolymer coating application step, also be coated with at the another side of film and be covered with fluoropolymer coating.
On fluoropolymer coating, adopt the method for blade coating to apply the polycrystalline epoxy resin that last layer thickness is about 1 μ m again.After 150 ℃ of dryings, obtain formal solar battery back film product.
With the preparation-obtained back film of solar cell structure of this process as shown in Figure 2, the gross thickness of this notacoria is about 195 μ m.
Adopt surface sweeping Electronic Speculum (SEM) technology that this notacoria surface is detected, the result as shown in Figure 4.The unusual densification in notacoria surface, smooth, TiO
2Filler distribution is even, and particle diameter is about 100-200nm (nanometer).Adopt surface sweeping Electronic Speculum (SEM) technology that the notacoria product surface that offshore company produces is detected, the result as shown in Figure 5.This film surface is very coarse, and there are tangible bubble and sheet-like particle projection in the part.This will have a negative impact to the weatherability and the insulating properties of product.
This product has extraordinary insulating properties, weatherability, UV resistant and anti-electrical breakdown performance, can combine with EVA glue is extraordinary, can be widely used in the encapsulation of various solar cells.
With Kynoar (PVDF) particle, propylene glycol monomethyl ether, mylar and titanium dioxide (TiO
2) in 35: 30: 5: 30 ratio, in the bead sand mill, evenly mix, sand milling 1 hour, form good leveling property, fineness less than 25 microns, the mixed solution of modest viscosity, be heated to 160 degrees centigrade then, adopt the method for roller coating to go up application one deck PVDF coating at clean PET film (thickness is about 150 μ m).Through 10 minutes baking, form the PVDF film after the solvent evaporates in the PVDF coating under 150 degrees centigrade temperature, the thickness of this film is about 20 μ m.
If adopt the mode of single face application, repeat above-mentioned PVDF application step, also be coated with at the another side of film and be covered with the PVDF film.
On fluorine-containing coat, adopt the method for blade coating to apply the polycrystalline epoxy resin that last layer thickness is about 1 μ m again.After 150 ℃ of dryings, obtain formal solar battery back film product.
With the preparation-obtained back film of solar cell structure of this process as shown in Figure 3, the gross thickness of this notacoria is about 191 μ m.
The method that electricity consumption is pressed is that the PET film of 120 μ m carries out the surface and goes Electrostatic Treatment to thickness, adopts the method for brushing at pet sheet face application one deck EVA adhesive then, is about 2 μ m at 120 ℃ of dried thickness.
With polytetrafluoroethylene (PTFE) particle, monobutyl ether acetate, amino resins, titanium dioxide (TiO
2) and carbon black in 35: 30: 4.5: 30: 0.5 ratio, in the bead sand mill, evenly mix, sand milling 1 hour, form good leveling property, fineness less than 25 microns, the mixed solution of modest viscosity, be heated to 180 degrees centigrade then, adopt the method for roller coating being coated with upward application one deck PTFE coating of the PET film of EVA glue (thickness is about 124 μ m).Through 10 minutes baking, form film after the solvent evaporates in the PTFE coating under 150 degrees centigrade temperature, the thickness of this film is about 20 μ m.
If adopt the mode of single face application, repeat above-mentioned PTFE application step, also be coated with at the another side of film and be covered with the PTFE film.
On fluorine-containing coat, adopt the method for blade coating to apply the modified epoxy that last layer thickness is about 1 μ m again.After 150 ℃ of dryings, obtain formal solar battery back film product.
With the prepared product appearance of this process is black thin film, and gross thickness is about 185 μ m.
Claims (3)
1. back film of solar cell, the PET film matrix that comprises thickness 100～350 μ m, described matrix coated on both sides has the fluoropolymer coating of 15～30 μ m, wherein be coated with the adhesive phase A of 0.5～5 μ m on the one side fluoropolymer coating, also have the adhesive phase B of one deck 1～3 μ m between described matrix and the fluoropolymer coating; Described fluoropolymer coating is mixed by proportioning by each raw material components after the mixed emulsion that sanded obtains directly is coated on the PET film matrix obtains, and the raw material of described fluoropolymer coating comprises the component of following quality proportioning:
Fluoro-containing coating 30～55%
Solvent 20～40%
Crosslinking agent and curing agent 2～6%
Filler 15～40%;
Described fluoro-containing coating is mainly the fluoro containing polymers resin, and described fluoro containing polymers resin is following one or more mixing: polyvinyl fluoride, Kynoar, polytetrafluoroethylene, perfluoroethylene-propylene, fluorubber, chlorotrifluoroethylene-alkyl vinyl ether co-polymer;
Described solvent is following one or more mixing: dimethylbenzene, n-butanol, butyl acetate, propylene glycol monomethyl ether, monobutyl ether acetate, methyl pyrrolidone;
Described crosslinking agent and curing agent are following one or more mixing: mylar, many isocyanide esters, amino resins, epoxy resin, Lauxite, gamma-butyrolacton;
Described filler is following one or more mixing: titanium dioxide, silicon dioxide, ultra-fine barium sulfate, precipitated calcium carbonate;
The employed adhesive of described adhesive phase A is selected from EVA glue, acrylic resin, polyurethane, epoxy resin or their modifier;
The employed adhesive of described adhesive phase B is selected from EVA glue, acrylic resin, polyurethane, epoxy resin or their modifier.
2. back film of solar cell as claimed in claim 1, the raw material that it is characterized in that described fluoropolymer coating also comprises pigment, described pigment comprises carbon black, cobalt blue, chrome yellow, titanium dioxide, iron oxide, and the raw material of described fluoropolymer coating is made up of the component of following quality proportioning:
Fluoro-containing coating 30～55%
Solvent 20～40%
Crosslinking agent and curing agent 2～6%
Filler 15～40%
Pigment 0.5～2%.
3. the production technology of a back film of solar cell as claimed in claim 1 is characterized in that the production technology of described solar battery back film comprises the steps:
(1) the PET film matrix is carried out preliminary treatment;
(2) the mode application of adhesive of spraying, roller coating or blade coating is adopted on the PET film matrix two sides after step (1) is handled, and applies to finish after 50～150 ℃ of dryings, forms the adhesive phase B of 1～3 μ m;
(3) after being mixed by proportioning, each raw material components of described fluoropolymer coating carries out sanded, form good leveling property, fineness less than 25 microns, the mixed emulsion of modest viscosity, directly be coated in through on the pretreated PET film matrix, obtain the fluoropolymer coating of 15～30 μ m then 50～200 ℃ of crosslinking curing film forming;
(4) the mode application of adhesive by spraying, roller coating or blade coating on the one side fluoropolymer coating therein applies the back that finishes 50～150 ℃ of dryings, the adhesive phase A of formation 0.5～5 μ m, thus make described back film of solar cell.
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Correction item: Patentee|Address|Co-patentee Correct: Chengzhou City Xinhua Technology Co., Ltd.|312400 Zhejiang Province, Shengzhou City Gong Dian 22 North Lane No. 23|Zhejiang University of Technology|Zhang Yunyun False: Zhejiang University of Technology|310014, Zhejiang, Wang Chao Road, No. 18, Zhejiang University of Technology|Zhang Yunyun Number: 05 Volume: 27 |
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Address after: 312400 Zhejiang Province, Shengzhou City Gong Dian 22 North Lane No. 23 Patentee after: ZHEJIANG VENTURA PHOTOVOLTAIC MATERIALS Co.,Ltd. Patentee after: ZHEJIANG University OF TECHNOLOGY Patentee after: Zhang Yunyun Address before: 312400 Zhejiang Province, Shengzhou City Gong Dian 22 North Lane No. 23 Patentee before: Shengzhou Xinhua Technology Co.,Ltd. Patentee before: Zhejiang University of Technology Patentee before: Zhang Yunyun |
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