Preparation of SiO2 Aerogels Heat Insulation Composites Reinforced by Aramid Fiber

A high malleable silica aerogel composite was prepared by acid/base two step sol-gel process in alcohol-water mixed solvents with tetraethoxysilane (TEOS) as precursor, aramid fiber as reinforcement, followed by ambient-dried method. The microstructure and properties were characterized by FESEM, BET and so on. The results indicated that the composites with different density, contour and thermal conductivity can be prepared by changing the reaction parameters. The average pore size of aerogel is 10 similar to 20 nm, specific surface area is more than 1000 m(2)/g, which is hopeful to be applied in heat insulation field