A kind of preparation method of eva thin film surface coating

Abstract

The invention relates to a preparation method of an EVA (ethylene-vinyl acetate) film surface paint. The EVA film surface paint is composed of the following components in percentage by mass: 5-10% of carbon nanotube, 5-15% of nano silicon dioxide, 3-15% of fatty alcohol polyethenoxy ether, 3-5% of acrylic acid, 3-5% of propylene glycol monomethyl ether acetate and the balance of organic solvent. The mass ratio of the fatty alcohol polyethenoxy ether to the acrylic acid is 1:1-3:1; and the fatty alcohol polyethenoxy ether is used as a dispersant, the acrylic acid is used as an adhesive, and the propylene glycol monomethyl ether acetate is used as a film-forming assistant. The coating film formed by the EVA film surface paint has electric conductivity and low yellowing rate, and enhances the photoelectric conversion rate of the battery pack; and the preparation method is simple in technique and convenient to operate, and can efficiently enable the carbon nanotubes and silicon dioxide nanotubes to be uniformly dispersed and fixed to the EVA film surface.

Description

Technical field [0001] The invention relates to a method for preparing an EVA film surface coating, and 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, resource adequacy, etc. 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 material must have a high d...

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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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