Nano coating for EVA (ethylene-vinyl acetate copolymer) film surface of solar packaged cell

Abstract

The invention relates to a nano coating for an EVA (ethylene-vinyl acetate copolymer) film surface of a solar packaged cell. 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 butyl ether 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 butyl ether serves as a film forming aid. A film covered by a coat formed by the nano coating for the EVA film surface has electrical conductivity and low yellowing rate and simultaneously improves the photoelectric conversion rates of battery packs. A 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 nano coating on the surface of an EVA film of a solar packaging battery, which belongs to the technical field of organic chemistry. Background technique [0002] In the context of global warming, the deterioration of the human ecological environment, and the shortage of conventional energy, the sustainable development strategy is accepted by all countries in 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 it is valued and supported by governments of various countries. The photovoltaic market has expanded rapidly in recent years, and the supply of photovoltaic products has exceeded demand. [0003] At present, in the production process of solar cells, the cells need to be packaged. The nature of the packaging material will largely determine the performance and lifetime of the solar cell module. A good packaging mat...

AI Technical Summary

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 UV light absorber or (and) the 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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