Double-layer polyester film and preparation method thereof

Abstract

The invention relates to the technical field of thermal-insulation films and particularly relates to a double-layer polyester film and a preparation method thereof. By forming a self-cleaning auxiliary wear-resistant layer on the upper surface of a first substrate layer, the wear resistance of the film is ensured, the film has hydrophobic, oleophobic, anti-frost, anti-fog, pollution-resistant, antibacterial and self-cleaning functions and the transmittance of the film can also be increased; the self-cleaning auxiliary wear-resistant layer is prepared by curing specific component in a specific proportion, the double-layer polyester film is strong in self-cleaning capability, and the contact angle is 140 degrees-158 degrees. A UV-resistant and infrared-resistant thermal-insulation layer is formed between the first substrate layer and the second substrate layer, is prepared by curing specific component in a specific proportion and can well shield ultraviolet and 800-2500nm infrared light; hollow glass microspheres are added so that the thickness of the coating can be precisely controlled and since the hollow glass microspheres have the characteristics of being hollow, light in weight and low in thermal conductivity, the purposes that the heat transfer coefficient is reduced and the thermal-insulation performance of the film is enhanced are achieved.

Description

technical field

[0001] The invention relates to the technical field of thermal insulation film, in particular to a double-layer polyester film and a preparation method thereof. Background technique

[0002] With the development of society, energy resources are constantly being developed and utilized, and the contradiction between energy and the environment is constantly increasing. Research on energy-saving materials has become a hot field of research today. According to research reports, the energy of solar radiation reaching the earth's surface is mainly concentrated in the wavelength range of 0.3-2.5 μm, of which the wavelength of 0.2-0.38 μm is ultraviolet rays, and its radiation energy accounts for about 5% of the total solar radiation energy; the wavelength of 0.38-0.78 μm It is visible light, whose radiant energy accounts for about 44% of the total solar radiant energy; wavelength 0.78-2.5μm is near-infrared ray, whose radiant energy accounts for about 51% of the tot...

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