PROCESS FOR PREPARING HYDROPHOBIC SILICA

摘要

PURPOSE: A method for manufacturing hydrophobic silica is provided to improve hydrophobicity of silica by coating two of more kinds of silane coupling agents on the surface of the silica. CONSTITUTION: The surface of silica is coated with two or more kinds of silane coupling agents represented by chemical formula 1 or 2. In chemical formula 1, R1 to R6 are identical or different and are C1 to C5 alkyl groups; and R7 to R9 are identical or different and C1 to C10 linear or branched alkylene groups. In chemical formula 2, R10 to R12 are identical or different and are C1 to C5 alkyl groups; and R13 is a C1 to C18 linear or branched alkyl group. The total content of the silane coupling agents is 1 to 20 parts by weight based on 100 parts by weight of the silica.