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A kind of coating for solar battery backplane

A technology for solar cells and backsheets, applied in coatings, circuits, electrical components, etc., can solve problems such as poor heat resistance, poor resistance to butanone wiping, and cloth grain on the laminated surface, so as to reduce production costs, Good laminate appearance and improved weather resistance

Active Publication Date: 2019-09-13
乐凯胶片股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the Chinese patent CN102802942A, thermoplastic acrylic acid (B44) is used as the bonding medium of the coating, and the content of methyl methacrylate monomer accounts for more than 60% of the content of the acrylic resin, and the content of methyl methacrylate in the acrylic resin is high. The prepared coating has low adhesion to the substrate. In order to improve the adhesion of the coating, this patent uses a primer in the preferred solution, and the coating prepared by thermoplastic acrylate has poor resistance to butanone wiping, The hardness is low, and there are disadvantages such as cloth grain on the laminated surface
Chinese patent CN104403442A and Chinese patent CN104449312A are both acrylic-modified thermoplastic vinylidene fluoride coatings. Due to the poor heat resistance of the coating and the lack of cross-linking structure in the coating, the coating prepared by the coating has low hardness and is easy to laminate. Appearance has disadvantages such as cloth pattern
In the Chinese patent CN104335361A, the content of vinylidene fluoride accounts for more than 60% of the resin content. Because PVDF is non-sticky, the adhesion of the coating to the backsheet substrate is low
In the Chinese patent CN103703571A, the coating needs to be pre-coated with a primer, and the construction process is complicated.

Method used

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  • A kind of coating for solar battery backplane
  • A kind of coating for solar battery backplane
  • A kind of coating for solar battery backplane

Examples

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preparation example Construction

[0031] The preparation method of the vinylidene fluoride polymer is as follows: combining vinylidene fluoride gas-phase monomer with vinyl fluoride, hexafluoropropylene, tetrafluoroethylene, chlorotrifluoroethylene, trifluoroethylene, hexafluoroisobutylene, perfluorobutylethylene, One or more of the gas phase monomers such as perfluorovinyl ether are pressed into the autoclave according to the weight ratio, the reaction kettle is opened, and the reaction is carried out under the condition of 80 ° C for 3 hours, and the material is discharged after cooling to obtain a partial A sample of vinyl fluoride copolymer.

[0032] The fluorine-containing acrylic resin is formed by copolymerization of acrylate monomer, hydroxyl-containing acrylate monomer and fluorine-containing acrylate monomer.

[0033] The acrylate monomer is selected from methyl methacrylate, methyl acrylate, ethyl methacrylate, ethyl acrylate, propyl methacrylate, propyl acrylate, methacrylic acid having good compat...

Embodiment 1

[0051] Coating composition:

[0052] Vinylidene fluoride and hexafluoropropylene copolymer (vinylidene fluoride content 95%, melting point 158°C, molecular weight 150,000) 5g, fluorine-containing acrylic resin (fluorine-containing acrylic monomer content 8%, molecular weight 15,000) 16g, HDI 1.4g , 13g of titanium dioxide, 0.1g each of defoamer and dispersant, and 64.4g of mixed solvent of butyl acetate, isoflurane, and nitrogen dimethylformamide.

[0053] The coating is coated on the PET substrate, dried at 180° C., and then the uncoated PET surface is compounded with a polyurethane adhesive and PE to obtain a solar cell back sheet.

Embodiment 2

[0055] Coating composition:

[0056] Vinylidene fluoride and tetrafluoroethylene copolymer (vinylidene fluoride content 88%, melting point 150 ℃, molecular weight 300,000) 10g, fluorine-containing acrylic resin (fluorine-containing acrylic monomer content 14%, molecular weight 10,000) 15g, IPDI 1.9 g; 16 g of titanium dioxide, 0.1 g each of defoaming agent and dispersant, and 57.2 g of butyl acetate, isoflurane, and nitrodimethylacetamide.

[0057] The coating was coated on both sides of the PET substrate, and dried at 180° C. to obtain a solar cell back sheet.

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Abstract

The invention relates to paint for solar cell backsheet. The paint comprises the following components in parts by mass: 5-12 parts of a vinylidene fluoride copolymer, 12-18 parts of fluorine containing acrylic resin, 1-2 parts of an isocyanate curing agent, 50-60 parts of a solvent, 13-18 parts of a pigment, and 0.1-1 part of an auxiliary agent. The paint can satisfy requirements of the solar cell backsheet on butanone resistance, high hardness and good laminated apparent, and after the paint is boiled under pressure for 100 hours, the paint has good adhesive force for a solar cell backsheet base material.

Description

technical field [0001] The invention relates to the technical field of photovoltaic cells, in particular to a solar cell backplane. Background technique [0002] Nowadays, solar cells have been widely used. Since the silicon wafers in the solar cells are easily corroded by water vapor and oxygen, they need to be encapsulated. The encapsulation is to "cover the top and bottom pad" of the battery silicon wafer, encapsulate the battery silicon wafer, and bond it together with the upper glass and the lower backplane by vacuum lamination technology. [0003] Most of the solar cell backsheets use a three-layer film structure, the middle layer is the support PET, the inner adhesive layer is generally EVA or polyolefin, and the outer layer is a weather-resistant layer, which is resistant to water vapor in the air, ultraviolet radiation, sand and chemical resistance. The effect of product erosion is generally fluorine-containing films, such as PVF film, PVDF film, ETFE film, etc.; a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D133/16C09D127/16H01L31/049
Inventor 顾丽争刘丽英张振华胡亚召柳青李华锋
Owner 乐凯胶片股份有限公司