Patent ID: 7931940
Filing Date: 2011-04-26
Classification: B05D,C01B,C09D,G02B,Y10T

Abstract:
1. A method for producing a silica aerogel film comprising the steps of hydrolyzing and polymerizing alkoxysilane in the presence of a base catalyst to prepare an alkaline sol, adding an acid catalyst to the alkaline sol to carry out further hydrolysis and polymerization to prepare a first acidic sol, hydrolyzing and polymerizing alkoxysilane in the presence of an acid catalyst to prepare a second acidic sol, mixing said first and second acidic sols, applying the resultant mixed sol to a substrate, and drying it; wherein an average particle size ratio of silica particles in said first acidic sol to silica particles in said second acidic sol in said mixed sol is 18.9-21.4.