COATING SOLUTION FOR FORMING HYDROPHILIC SILICA FILM AND METHOD FOR PRODUCING FILM USING THE SOLUTION

摘要

PROBLEM TO BE SOLVED: To obtain a silica film having excellent hydrophilicity. SOLUTION: A substrate is coated with a solution comprising an inorganic substance having <=5μm average particle diameter in a solution obtained by dissolving a silicone alkoxide in an organic solvent or a solution obtained by dissolving a hydrolyzate of the silicon alkoxide or an organic solvent-soluble silicon oxide in the organic solvent, and the coated substrate is dried and calcined at 50-200 deg.C and baked at >=300 deg.C to form unevenness caused by the inorganic substance and generating fine pores or cracks on the surface of the silica film as well. Thereby, a porous film is formed.