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Paint for solar cell backsheet

A technology for solar cells and coatings, applied in coatings, circuits, electrical components, etc., can solve the problems of poor heat resistance, lamination appearance with texture, low coating hardness, etc., to improve weather resistance and reduce production costs. , the effect of simple production process

Active Publication Date: 2017-08-22
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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preparation example Construction

[0031] The preparation method of the vinylidene fluoride polymer is that the gas-phase monomer of vinylidene fluoride is mixed 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 high-pressure reactor according to the weight ratio, the reactor is opened, and the reaction is carried out at 80°C for 3 hours, and the material is discharged after cooling to obtain partial Samples of vinyl fluoride copolymers.

[0032] The fluorine-containing acrylic resin is formed by copolymerizing acrylate monomers, hydroxyl-containing acrylate monomers and fluorine-containing acrylate monomers.

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

Embodiment 1

[0051] Paint 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, 64.4g of mixed solvent of butyl acetate, isoflurane, and nitrogen-nitrogen dimethylformamide.

[0053] Coating the paint on the PET substrate, drying at 180°C, and then compounding the uncoated PET surface with a polyurethane adhesive and PE to obtain a solar battery back sheet.

Embodiment 2

[0055] Paint Composition:

[0056] Copolymer of vinylidene fluoride and tetrafluoroethylene (vinylidene fluoride content 88%, melting point 150°C, molecular weight 300,000) 10g, fluorine-containing acrylic resin (fluorine-containing acrylic monomer content 14%, molecular weight 10,000) 15g, IPDI 1.9 g: 16g of titanium dioxide, 0.1g each of defoamer and dispersant, 57.2g of butyl acetate, isoflurane, and nitrogen-nitrogen dimethylacetamide.

[0057] Coating the paint on both sides of the PET base material, and drying at 180° C., to obtain a solar battery 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 backboard. Background technique [0002] Nowadays, solar cells have been widely used. Because the silicon wafers in solar cells are easily corroded by water vapor and oxygen, they need to be packaged. Encapsulation is to "cover" the silicon wafer of the battery, enclose the silicon wafer of the battery, and bond it together with the upper glass and the lower backplane by vacuum lamination technology. [0003] Most of the solar cell backsheet adopts a three-layer film structure, the middle layer is the support body PET, the inner adhesive layer is generally EVA or polyolefin, and the outer layer is a weather-resistant layer, which can withstand water vapor in the air, ultraviolet radiation, wind and sand, and chemical resistance. Corrosion of products, generally fluorine-containing films, such as PVF film, PVDF film, ETFE film, etc.; adhesives are used to ...

Claims

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Application Information

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Patent Type & Authority Applications(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
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