Production process of silicon-based sunscreen and heat-insulation powder

Abstract

The invention discloses a production process of silicon-based sunscreen and heat-insulation powder, and relates to the field of paints.The silicon oxide-based sunscreen and heat-insulation powder is prepared with water glass as a silicon source through a sol-gel method; SiO2 hydrosol is obtained after the water glass is treated with ion exchange resin, and SiO2 gel is obtained by adding a base catalyst and gelling; aging, surface modification, drying, heat treatment and other processes are performed to obtain dry gel coarse powder; and air jet pulverization is performed to obtain aerogel microparticles. In the process, boric acid, calcium chloride, aluminum chloride and zirconium oxychloride are used as raw materials and are doped into SiO2, so that the problems that the heat conductivity coefficient of a nano silicon oxide heat insulation material is sharply increased along with temperature rise and the heat insulation capacity at high temperature is greatly reduced are solved; and doped SiO2 is modified by using a modifier, and a large amount of hydroxyl groups on the surface of the doped SiO2 are eliminated, so that the doped SiO2 can be more easily dispersed in the coating, and the sunscreen and heat insulation effects are further improved.

Description

technical field [0001] The invention relates to the field of coatings, in particular to a production process of silicon-based sunscreen and heat insulation powder. Background technique [0002] At present, reflective heat insulation coatings are commonly used in the construction field for sun protection and heat insulation. Although the coating has good effects, its heat insulation performance still cannot meet the current needs of high-level green buildings for building energy conservation. Therefore, a new generation of green building sun protection is developed. Thermal insulation products have important social benefits and potentially huge economic benefits; [0003] The unique micro-nano structure of silica airgel makes it have the characteristics of low density, high specific surface area and high porosity. These characteristics make it have unique and excellent properties in thermal, optical, electrical, acoustic and other aspects. Therefore, It can be used as a high...

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Problems solved by technology

[0004] However, the effective extinction coefficient of the nano-silica material for the wavelength range of 2.5-7.5μm is 0.1-19.5m 2 / kg, indicating that the sample is almost transparent to infrared radiation in this band, and most of the thermal radiation energy in this band passes directly through the nano-silicon oxide heat-insulating material, which eventually leads to a sharp increase in the thermal conductivity of the material as the temperature rises. Increase, so that its heat insulation ability at high temperature is greatly reduced;

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