초록 ▼

The invention relates to a multilayered water-repellent film formed on a glass substrate by the sol-gel process. The film has a first metal oxide layer which is formed on the glass substrate by the sol-gel process and a second water-repellent layer formed on the first layer. As a first method for pr

The invention relates to a multilayered water-repellent film formed on a glass substrate by the sol-gel process. The film has a first metal oxide layer which is formed on the glass substrate by the sol-gel process and a second water-repellent layer formed on the first layer. As a first method for providing the film with superior durability of water repellency, mechanical strength and chemical resistance, the first layer is prepared by using a mixture of three specific sols which are respectively prepared from metal alkoxides or metal acetylacetonates. As a second method for providing the film with the above advantages, the second layer is prepared by using a coating mixture comprising a fluoroalkylsilane, tin oxide particles doped with antimony oxide, a silicon compound, water and an organic solvent. As a third method for providing the film with the above advantages, the second layer is prepared by using another coating mixture comprising a fluoroalkylsilane, tin oxide particles doped with antimony oxide, a silicon compound, water, an organic solvent and an acid.

대표청구항 ▼

[ What is claimed is:] [1.] A multilayered water-repellent film formed on a glass substrate, the film having a first metal oxide layer having a minutely rough surface having on the surface at least one of micro-pits and micro-projections and a second water-repellent layer, the film being prepared by

[ What is claimed is:] [1.] A multilayered water-repellent film formed on a glass substrate, the film having a first metal oxide layer having a minutely rough surface having on the surface at least one of micro-pits and micro-projections and a second water-repellent layer, the film being prepared by a method comprising the steps of:(a) preparing a first sol through hydrolysis and polycondensation of a first compound so as to disperse a first polymer of the first compound in the first sol, the first compound being a member selected from the group consisting of tetrafunctional metal alkoxides and tetrafunctional metal acetylacetonates;(b) preparing a type-A second sol through hydrolysis and polycondensation of a second compound so as to disperse a second polymer of the second compound in the type-A second sol, the second compound being a member selected from the group consisting of metal alkoxides which are trifunctional or bifunctional and metal acetylacetonates which are trifunctional or bifunctional, metal of the second compound being the same as that of the first compound;(c) preparing a third sol through hydrolysis and polycondensation of a third compound so as to disperse a third polymer of the third compound in the third sol, the third compound being a member selected from the group consisting of metal alkoxides and metal acetylacetonates, metal of the third compound being different from that of the first and second compounds;(d) mixing the first sol, the type-A second sol and the third sol together with a solvent to form a first coating mixture;(e) applying the first coating mixture to the glass substrate so as to form a first sol film on the glass substrate;(f) heating the first sol film so as to transform the first sol film into a first gel film and then into the first metal oxide layer which has a minutely rough surface having on the surface at least one of micro-pits and micro-projections; and(g) forming the second water-repellent layer on the first metal oxide layer.