Silica sol and hydrophobic silica coat and hydrophobic silica powder body null for hydrophobic silica formation

摘要

PURPOSE: To obtain a silica sol for forming hydrophobic silica in a simplified process by mixing and stirring an alkyl orthosilicate with an alcohol and a specific compound having the affinity to the alcohol in the presence of an acid. ;CONSTITUTION: This silica sol is obtained by mixing and stirring an alkyl orthosilicate with an alcohol, water at 0.1-0.8vol. ratio to the alkyl orthosilicate and one or two or more selected from chain saturated compounds, cyclic ketones and aromatic compounds having the affinity to the alcohol in the presence of an acid. The hydrophobic silica film is formed by coating the surface of a substrate with the resultant silica sol and then drying the coated silica sol. Furthermore, the hydrophobic silica power is prepared by drying this silica sol.;COPYRIGHT: (C)1994,JPO&Japio