PVB film capable of blocking ultraviolet rays and infrared rays simultaneously and preparation method thereof

Abstract

The invention relates to a PVB (polyvinyl butyral) film capable of blocking ultraviolet rays and infrared rays simultaneously and a preparation method thereof. The PVB film capable of blocking ultraviolet rays and infrared rays simultaneously is formed by compounding an upper layer film, a middle layer film and a lower layer film sequentially, wherein the thickness of the middle layer film is 110-150 microns, and the thicknesses of the upper layer and lower layer films are 150-450 microns; the material of the middle layer film is prepared from modified PVB resin powder of which the melt index is 5-8g / 10min, and the materials of the upper layer and lower layer films are prepared from modified PVB resin powder of which the melt index is 3-4g / 10min; and a preparation method of the modified PVB resin powder comprises the steps of performing a condensation reaction on selected raw materials, and then performing neutralization treatment, dehydration and drying preparation to prepare the modified PVB resin powder. A prepared three-layer PVB film is applied to laminated glass and can effectively block infrared rays of which the wavelength is 780-2500nm and ultraviolet rays of which the wavelength is 200-380nm.

Description

technical field [0001] The invention relates to an infrared-blocking PVB film, which belongs to the field of application of infrared-blocking adhesive glass. Background technique [0002] In recent years, with the rapid development of my country's real estate industry, glass curtain walls have been widely used in large buildings. Most of the heat-insulating glass is designed with LOW-E and insulating glass, but the safety hazards brought about by it are also increasing. At the same time, PVB interlayer film is generally used in the domestic safety glass industry. With the development of the economy, higher energy-saving requirements are put forward for heat-insulating safety glass. [0003] The wavelength of solar radiation is mainly between 200-2500nm, among which the wavelength of ultraviolet rays is between 200-380nm, the wavelength of visible light is between 380-780nm, and the wavelength of infrared rays is between 780-2500nm (780nm-1500nm is near infrared ray , 1500nm...

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Problems solved by technology

[0005] Chinese patents CN203530211U, CN103044828A, CN1555989A and CN102863917A disclose that the thermal insulation effect of PVB film can be improved by adding ATO or ITO nano-infrared functional particles. Heat-sensitive near-infrared rays (790-1500nm) have poor blocking effect

Chinese patent CN202344958 discloses an XIR thin-film heat-reflective interlayer energy-saving film. Although it achieves the purpose of reducing energy consumption and energy saving, its preparation process is complicated, and the composite processing process is complicated and time-consuming. During the processing process, air bubbles are easily generated, and it is heat-insulated. The film is prone to shrinkage and deformation, which leads to a high rate of defective products, resulting in a lot of waste and greatly increasing production costs

[0006] In view of the fact that domestic and foreign patent documents use nano-metal oxides as the infrared absorber of PVB film, nanoparticles absorb infrared light to play a heat insulation effect, but because nanoparticles are difficult to disperse in PVB resin and nanoparticles are easily discolored by ultraviolet light, resulting in The heat insulation products of metal oxide nanoparticles modified PVB film cannot be marketed. The present invention mainly solves the problem of nanoparticle dispersion and discoloration, and provides a three-layer infrared blocking PVB film for the market.

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