Long-life back film for solar photovoltaic panel

Abstract

The invention discloses a long-life back film for a solar photovoltaic panel. The long-life back film is provided with, from top to bottom, a fluorine film layer, an adhesive layer, a PET layer, another adhesive layer and another fluorine film layer, wherein the fluorine film layer comprises ethylene-vinylidene fluoride copolymer, propylene-hydroxyethyl acrylate copolymer, p-chlorobenzenesulfonamide, tetramethyl ethylenediamine and calcium phosphate and the adhesive layer comprises butadiene-octyl acrylate copolymer, styrylphenyl ketone and butyl butyrate. According to the invention, through modification of a traditional fluorine film and introduction of ethylene molecules, bonding strength of the fluorine film and the adhesive used in the invention is greatly improved; through introduction of the propylene-hydroxyethyl acrylate copolymer, weatherability of the fluorine film layer is synergistically improved and bonding strength of the adhesive after outdoor exposure for a long time is enhanced; and the butadiene-modified poly(octyl acrylate) adhesive is specially developed directed at the modified fluorine film layer, has to be cooperatively used with the fluorine film layer and can achieve more stable, more long-lasting and better bonding strength.

Description

technical field [0001] The invention relates to a polymer film group, in particular to a high-life back film used 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 are...

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 on both sides of the PET base material inside the back film, and the quality of the adhesives varies, and the composite process is uneven, the back film is affected by the combined effects of humidity and temperature during the long-term outdoor use of the battery module, and it is prone to adhesive adhesion. layer hydrolysis and other damages, which eventually lead to delamination between the fluorine-containing film and the PET substrate, 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 ordinary polyurethane, epoxy or acrylic adhesives to replace the adhesives used abroad, but these adhesives are prone to aging and cannot meet the performance requirements of 25 years or even Longer durability requirements

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