Preparation, Characterization and Properties of SiO₂ Aerogel Composite Thermal Insulation Coating

Abstract

Probing into the preparation and thermal insulation mechanism of SiO2 aerogel composite thermal insulation coating, it is discovered that the thermal insulation and heat control of the coating are realized by means of reducing the thermal conductivity, increasing the reflectivity and radiance, etc. The author obtains the content of each filler by single-doped experiments, acquires the optimal coating formula by orthogonal experiment, and gets the characteristics of the coating with self-made thermal insulation test equipment, scanning electron microscope (SEM), fourier translation infrared spectrum (FT-IR), X-ray diffractometer (XRD) and other analytical methods. The results show that the SiO2 aerogel composite thermal insulation coating has the best performance when 5?t% SiO2 aerogel, 5?t% titanium dioxide, 5?t% hollow glass beads, and 10?t% far- infrared ceramic powder are added. Besides, the high temperature performance of the coating improves with the increase of mass fraction of SiO2 aerogel. When the fraction is 5?t%, the SiO2 aerogel composite thermal insulation coating performs well at 300°C. Therefore, the author concludes that the SiO2 aerogel significantly improves the thermal insulation and high temperature performance of the thermal insulation coating. The conclusion lays a good foundation for the application of SiO2 aerogel in the coating industry.