White EVA adhesive film for photovoltaic module encapsulation

Abstract

The invention discloses a white EVA adhesive film for photovoltaic module encapsulation. The adhesive film comprises the following components in parts by weight: 10-45 parts of EVA resin, 10-60 parts of a high-melting-point polymer, 2-25 parts of inorganic filler, 0.2-5 parts of an anti-ultraviolet agent and 0.2-5 parts of an antioxidant. According to the white EVA adhesive film for photovoltaic module encapsulation provided by the invention, a two-phase continuous structure is formed by adding the high-melting-point polymer component in EVA, thus reducing flowability during EVA lamination and then solving the problem of flanging during white EVA lamination.

Description

technical field [0001] The invention relates to a photovoltaic module packaging material, in particular to a white EVA adhesive film for photovoltaic module packaging. Background technique [0002] With the depletion of traditional fossil fuels, human beings are constantly looking for new energy alternatives. Solar energy is currently recognized as a green and renewable resource. The most common structure of solar photovoltaic modules on the market from top to bottom is photovoltaic tempered glass, upper EVA, crystalline silicon cells, lower EVA and photovoltaic backsheet, of which the upper EVA and the lower EVA is transparent, sunlight passes through the glass, and the upper layer of EVA is irradiated on the crystalline silicon cell, and is absorbed in the interface layer to generate photocurrent, and the intensity of this photocurrent increases with the intensity of light irradiated on the surface of the cell. And increase, the general photovoltaic backplane is white, w...

AI Technical Summary

Problems solved by technology

Solar energy is currently recognized as a green and renewable resource. The most common structure of solar photovoltaic modules on the market from top to bottom is photovoltaic tempered glass, upper EVA, crystalline silicon cells, lower EVA and photovoltaic backsheet, of which the upper EVA and the lower EVA is transparent, sunlight passes through the glass, and the upper layer of EVA is irradiated on the crystalline silicon cell, and is absorbed in the interface layer to generate photocurrent, and the intensity of this photocurrent increases with the intensity of light irradiated on the surface of the cell. And increase, the general photovoltaic backplane is white, which has the function of reflecting light, the light passing through the gap of the crystalline silicon cell passes through the transparent EVA of the lower layer, after reflection, only a small part of the light can shine on the surface of the cell, while Most of the light is absorbed by the back of the cell, which cannot produce effective gain effects

[0003]In order to improve the light utilization rate of solar modules, many EVA manufacturers have introduced white EVA packaging materials with high reflectivity to replace the original lower transparent EVA. The white EVA packaging material contains cross-linking agents and cross-linking aids, so that during use, the white EVA interpenetrates with the transparent EVA above when it is laminated, resulting in appearance defects, and there will be air bubbles when the white EVA is laminated. At the same time, after melting, it will flow on the surface of the cell, causing the area of ​​the cell covered by white EVA to fail to generate electricity, commonly known as the phenomenon of flanging

[0004] In order to solve the problem of rummaging, some manufacturers use non-woven fabrics or glass fibers to reduce the fluidity of EVA during use (such as patent 201220724624.4 or 2012201217924), this method It seems that this kind of problem can be solved, but in the actual use process, the solution effect is not obvious