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Due to low thermal conductivity, SiO2 aerogel has been widely applied in thermal insulation engineering. SiO2 aerogel thermal insulation coating is the focus in the field of thermal insulation engineering, and the dispersion stability of aerogel in the coating is mainly related to its development. From the mechanism of dispersion, hydrophobic SiO2 aerogel was modified to improve their dispersion performance in the aqueous medium. Research the influences of different kinds and dosages of wetting and dispersing agents, different dispersion conditions affect the dispersion performance of SiO2 aerogel, and through particle size analysis and transmittance to analysis dispersion performance of SiO2 aerogel slurry. The modified SiO2 aerogel were characterized by Fourier translation infrared spectrum (FT-IR), scanning electron microscopy (SEM), X-ray diffractometer(XRD) and contact angle measurement. The results showed that organic silicon wetting agent and alkyl amine salt dispersant were added respectively with 10wt% of SiO2 aerogel, the slurry has the best dispersion effect after dispersing at speed of 1800 r/min for 3 hours, the average particle size was about 80 nm. The surface of SiO2 aerogel powder adsorbed dispersant after modification, and contact angle was from 145° decrease to 45°, it showed that hydrophilic of the hydrophobic SiO2 aerogel has enhanced. Surface modification increases the hydrophobic SiO2 aerogel compatibility in the water medium. At the same time, it reduced the reunion phenomenon in the slurry greatly and laid the foundation for preparation of SiO2 aerogel thermal insulation coatings. On the basis of this, we studied the thermal insulation properties of SiO2 aerogel thermal insulation coating, which provided basis for its application in thermal insulation engineering.

Dispersion Properties of Aerogel Slurry and Application of Its Coatings in Thermal Insulation Engineering