EVA film for packaging high-transmittance solar cell and preparation method thereof

Abstract

The invention relates to an EVA (Ethylene Vinyl Acetate) film and a preparation method thereof. The purpose of the invention is to provide the film having higher transmittance and high stability. The technical proposal adopted is as follows: the EVA film for packaging a high-transmittance solar cell comprises an ethylene-vinylacetate copolymer, wherein the EVA film comprises the following components according to part by weight: 100 parts by weight of ethylene-vinylacetate copolymer, 0.1-6 parts by weight of cross-linking curing agent, 0.05-5 parts by weight of nucleating transparent agent, 0.02-3 parts by weight of light stability, 0.05-5 parts by weight of antioxidant and 0.01-4.0 parts by weight of tackifier. The preparation method comprises the following steps of: (1) mixing the nucleating transparent agent with the tackifir; (2) evenly mixing the light stability with the antioxidant; (3) evenly mixing the cross-linking curing agent with the ethylene-vinylacetate copolymer particles; and (4) adding the mixtures obtained in the steps (1) and (2) to the mixture obtained in the step (3), and evenly mixing the mixtures together and then performing blending extrusion.

Description

technical field

[0001] The invention relates to a solar cell packaging material, in particular to an EVA adhesive film with high light transmittance and used for solar cell packaging and a preparation method thereof. Background technique

[0002] Solar cells are packaged with silicon wafers by means of two layers of polymer encapsulation films, and then bonded with upper and lower protective layer materials. In order to ensure that the packaged solar cell module has sufficient photoelectric conversion efficiency, the packaging material must be transparent, and the higher the light transmittance, the more light received by the silicon wafer in the cell module, and the higher the photoelectric conversion efficiency. In addition, the packaging material must have strong adhesive properties and aging resistance to ensure the stability and reliability of solar modules.

[0003] EVA (Ethylene-Vinyl Acetate Copolymer; Ethylene-vinyl acetate copolymer) resin is a non-crystalline pol...