Abstract：SiO2 aerogel is a lightweight material with ultra-low thermal conductivity, ultra-low density and high porosity, which is widely used in aerospace, construction and industrial energy saving. Ethyl orthosilicate (TEOS) as a precursor, trimethylchlorosilane (TMCS) as a modifier, SiO2 aerogel was prepared by sol-gel method and drying process. The effects of different drying methods, molar ratio of TEOS to anhydrous ethanol (TEOS/EtOH) and molar ratio of TMCS to TEOS (TMCS/TEOS) on the structure and insulation performance of the SiO2 aerogel were studied. The results showed that the SiO2 aerogels prepared by vacuum drying, TEOS/EtOH of 1?7 and TMCS/TEOS of 1?1.27 had excellent performance. It had uniform particle size and pore distribution with a particle chain network structure composed of nanoscale particles. It had the lowest thermal conductivity [0.036 1 W/(m·K)] and density (0.433 6 g/cm3), which could meet the performance requirements of thermal insulation materials.
XING Yue,MAN Tiannan,NONG Zhisheng et al. Optimization of Preparation Process of SiO2 Aerogel and Study on Its Thermal Insulation Performance[J]. Chemical Reaction Engineering and Technology, 2025, 41(6): 702-709.
