White polyester solar energy battery back film and preparation method thereof

Abstract

The invention relates to a white polyester solar cell back film and a preparation method thereof, belonging to the polyester film field. The white polyester solar cell back film consists of a polyester chip and a white polyester master batch, wherein the weight percent ratio of the polyester chip and the white polyester master batch is between 1.0:1 and 9.0:1; the white polyester master batch comprises the following components in weight percent: 35 to 89.4 percent of polyester chip, 0.5 to 10 percent of silicon dioxide, 10 to 50 percent of titanium dioxide and 0.1 to 5 percent of ultraviolet light absorbent; moreover, the silicon dioxide undergoes organic surface treatment with the particle diameter ranging between 10 and 100 nm, and the titanium dioxide also undergoes organic surface treatment with the particle diameter ranging between 100 and 1,000 nm. The white polyester solar cell back film has the characteristics of excellent light tight performance, insulativity, aging resistance and barrier property.

Description

technical field [0001] The invention relates to a white polyester solar battery back film and a preparation method thereof, belonging to the field of polyester films. Background technique [0002] Polyester film is usually colorless, transparent, glossy, with good strength, toughness and elasticity. Compared with other plastic films, it has high relative density, high tensile strength, moderate elongation, high impact strength and low air permeability. Good heat resistance and high transparency, and non-toxic and harmless, and widely used in packaging materials. With the rapid development of science and technology, polyester film has been applied in capacitors, photosensitive materials, audio and video, and solar cells. As disclosed in CN101065849A, "Easy Adhesive Polyester Film and Solar Cell Back Protective Film Using It" consists of a polyester film and a resin film coated on one side of the polyester film, and the crystallographic orientation of the polyester film ends ...

AI Technical Summary

Problems solved by technology

Due to the two-layer structure of this solar cell holding film, the manufacturing process is complicated, and special equipment is required for thermal processing. Not only the manufacturing cost is high, but also when the surface coating layer is processed, the surface coating layer is easily scraped off and the performance is damaged. decline

In addition, because the resin film is composed of resin and cross-linking agent, the resin is composed of polyester resin, acrylic resin and polyvinyl alcohol, etc., and the cross-linking agent contains oxazoline-based polymers or melamine, urea resin or ring Oxygen resin, because solvents must be used in the preparation process of film coating liquid, and conventional solvents contain volatile organic compounds, so in the process of making polyester films and using them, volatile organic compounds cause certain harm to the environment

And CN1286911C discloses "a kind of black opaque polyester film and its preparation method", which is composed of polyester chip, carbon black type black polyester masterbatch and carbon black organic dye compound type black polyester masterbatch. Opaque polyester film can achieve uniform blackness, bright surface, good thermal stability, etc., but it is not resistant to aging and has poor barrier performance. It can only be used for decoration, packaging, etc., but not for solar cells. protective film

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