Solar backboard with low water vapor permeability

Abstract

The invention relates to a solar backboard with low water vapor permeability. The solar backboard comprises a polyester film, the surfaces at the two sides of the polyester film are each covered with a reflection reducing coating, one side, provided with the one reflection reducing coating, of the polyester film is connected with a weather-resistant layer through a high adhesive coating, the other side, provided with one reflection reducing coating, of the polyester film is also connected with a structure enhancement layer through a high adhesive coating, and the outer side of the structure enhancement layer is also bonded with a weather-resistant adhesive coating; and the high adhesive coatings are formed by copolymerizing maleic anhydride and hydroxyethyl methacrylate, and the polyester film is composed of a biaxially oriented polyethylene terephthalate film prepared by polyethylene glycol terephthalate. The material of the weather-resistant layer of the solar battery backboard is a fluorine-containing weather-resistant layer which has the advantages of low cost, good environmental protection performance and better mechanical performance and bonding strength than a conventional backboard. Through arrangement of the reflection reducing coatings on the surfaces of the polyester film, the transmittance of the film can be improved, and the insulation performance is also greatly improved. The water vapor permeability of the polyester film can reach 0.89g / m<2>, and the surface tension and the water resistance are quite high.

Description

technical field [0001] The invention relates to the field of solar cell backboards, in particular to a solar backboard with low water vapor permeability. Background technique [0002] Solar energy, as a green and inexhaustible energy source, is undoubtedly the best choice to replace traditional thermal power generation. Since solar cells need to be exposed to the outdoors for a long time, the cells in photovoltaic modules need to be protected to prevent atmospheric pollution. The impact and overlooking of environmental factors such as water vapor, oxygen, and ultraviolet rays. The solar backsheet is one of the accessories of the whole solar cell. It mainly plays the role of mechanical support and protection of the cell from the penetration of environmental factors. At present, the performance of the solar backsheet with the existing structure is unstable, and the complex structure leads to complicated processing and increased production costs. . Contents of the invention ...

AI Technical Summary

Problems solved by technology

[0004] Problems of high water vapor permeability, poor barrier property and poor insulation during use

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