Effect of the Addition of TiO_2 to SiO_2 Films with Concave-Convex Surface Derived by the Sol-Gel Method on Film Harness and Appliecation to Water-repellent Glasses for Automiotive Windows

摘要

Silica-titaniz films with a concave-convex surface were prepared from a mixture of polymerized tetraethoxysilane (TEOS) sol containing tetraisopropoxytitanate and polymerized methyltriethoxysilane (MTES) sol in molar ratio MTES/TEOS of 6. Film hardness was dependent on the composition of the coating sol, hear treatment temperature and time. The film obtained by introduction of 4 mol% TiO_2 to SiO_2 and by heat treatment at 620deg C for 10 min was hard to be usable in engineering practice. New-type water-repellent glasses were produced by using these SiO_2-TiO_2 films as an under layer combined with fluoroalkylsilane; the glasses showed an abrasion resistance for practical application as automotive windows.