The invention discloses a method for preparing a silica
aerogel material and relates to the method for preparing the
aerogel material, in particular to the method for rapidly preparing a transparent SiO2
aerogel by being based on the
sol-gel technology and adopting secondary modification and normal pressure
drying. The invention provides the method for preparing the silica aerogel material, and the method has simple technology,
short cycle, low cost and good safety and is conductive to large-scale production. Tetraethoxysilane is adopted as a
silicon source, methyl trimethoxysilane or methyl
triethoxysilane is taken as a modifier of a co-precursor,
anhydrous ethanol is taken as a
solvent, and
hydrochloric acid and
ammonia are taken as catalysts. The
sol-gel acid-base two-
step method is adopted for
catalysis, thereby preparing the SiO2 wet gel; and the further modification is carried out on a wet gel sample after aging treatment under certain conditions, and the normal pressure low-temperature
drying is finally carried out in
air atmosphere, thereby preparing the SiO2 aerogel. The equipment cost during the preparation technology is low, the product has good performances and the reaction process is controllable.