Weather-resistant film for solar photovoltaic cell

Abstract

The invention discloses a weather-resistant film for a solar photovoltaic cell. The weather-resistant film is sequentially provided with a weather-resistant layer, an adhesive layer and an anticorrosive layer from top to bottom, wherein the weather-resistant layer comprises the following raw materials in parts by weight: 50 parts of epoxy resin, 33-35 parts of polyamide resin, 3-4 parts of m-difluorobenzene, 0.6-0.7 part of sodium citrate and 0.4-0.5 part of 5-sulfosalicylic acid; and the adhesive layer comprises the following raw materials in parts by weight: 50 parts of polymethyl methacrylate, 20-22 parts of a propylene-octyl methacrylate copolymer and 2-3 parts of ammonium phosphate. Through dual improvement of traditional film structure and formula, the bonding strength between the layers is improved; meanwhile, the structural strength, the corrosion resistance, the weathering resistance and the ageing resistance of a single-layer body are strengthened; and the weather-resistant film has relatively long service lifetime, and is low in manufacturing cost and easy to popularize and apply.

Description

technical field [0001] The invention relates to a polymer film group, in particular to a weather-resistant back film for solar photovoltaic panels. Background technique [0002] The back film in the solar photovoltaic panel is a photovoltaic packaging material that is directly in contact with the external environment on a large area. It is required to have excellent long-term aging resistance (humid heat, dry heat, ultraviolet), electrical insulation resistance, water vapor barrier and other properties. The most common existing back film is fluorine-containing back film, of which fluorine-containing back film is divided into double-sided fluorine-containing (TPT) and single-side fluorine-containing (TPE) back film, and the basic of double-sided fluorine-containing back film The structure is roughly fluorine-containing layer / glue / PET / glue / fluorine-containing layer. However, since the preparation technology and surface modification technology of fluorine-containing back film ...

AI Technical Summary

Problems solved by technology

However, since the preparation technology and surface modification technology of fluorine-containing back film are monopolized by large foreign companies, domestic production has not been realized in China, which also makes the domestic photovoltaic back film industry subject to foreign manufacturers for a long time, resulting in back film costs. High and difficult to import

[0003] Due to the presence of adhesives in the back film, the quality of the adhesives varies, and the composite process is uneven. During the long-term outdoor use of the battery module, the back film is subject to the combined effects of humidity and temperature, which is prone to damage such as hydrolysis of the adhesive layer. , which eventually leads to peeling between layers, making it difficult to meet the long-term reliability requirements of battery components

There have also been companies in China that have tried to use some common polyurethane, epoxy or acrylic adhesives to replace the adhesives used abroad, but these common adhesives are prone to aging and cannot meet the performance requirements of 25 Years or even longer durability requirements

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