A kind of preparation method of EVA thin film surface nano-coating

Abstract

The invention relates to a preparation method of a nano coating for an EVA (ethylene-vinyl acetate copolymer) film surface. The nano coating comprises the following components by mass percent: 15-20% of carbon nano tube, 5-15% of nano silica, 3-15% of fatty alcohol-polyoxyethylene ether, 3-5% of silane coupling agent, 3-5% of propylene glycol methyl ether acetate and 10-30% of organic solvent, wherein the mass ratio of fatty alcohol-polyoxyethylene ether to the silane coupling agent is (1:1)-(3:1); fatty alcohol-polyoxyethylene ether serves as a dispersing agent; the silane coupling agent serves as a binding agent; propylene glycol methyl ether acetate serves as a film forming aid. A film covered by a coat formed by the nano coating has electrical conductivity and low yellowing rate and simultaneously improves the photoelectric conversion rates of battery packs. The preparation method is simple in process and convenient to operate and can be used for efficiently dispersing and fixing the carbon nano tube and the silica nano tube on the EVA film surface uniformly.

Description

technical field [0001] The invention relates to a preparation method of a nano-coating on the surface of an EVA film, belonging to the technical field of organic chemistry. Background technique [0002] In the context of global warming, deterioration of the human ecological environment, and shortage of conventional energy sources, sustainable development strategies have been accepted by countries all over the world. Solar energy has the advantages of cleanliness, safety, and resource adequacy. It is one of the most important new energy sources in the 21st century and has been valued and supported by governments of all countries. In recent years, the photovoltaic market has expanded rapidly, and photovoltaic products are in short supply. [0003] At present, during the production process of solar cells, the cells need to be packaged. The properties of the encapsulation material will largely determine the performance and lifetime of the solar cell module. A good encapsulati...

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Problems solved by technology

[0005] In order to make the EVA film have a low yellowing rate and improve the high transmittance of the EVA film to visible light, thereby increasing the photoelectric conversion rate of the battery pack, three methods are usually used: the first one is to add ultraviolet light absorbers and light stabilizers , although the ultraviolet rays are shielded, the aging of the EVA film is accelerated because the energy absorbed by the ultraviolet rays is converted into heat energy; the second is to add antioxidants to eliminate the activity of the film produced by excessive cross-linking agents during use. Free radicals, because such free radicals will make the ultraviolet light absorber or (and) light stabilizer generate new compounds with chromophores, resulting in yellowing; the third is to add infrared reflective nanoparticles to the film, However, while shielding infrared rays, there is a problem that visible light is partially weakened

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