Process for producing article coated with water-repellent...

Details Process for producing article coated with water-repellent... Process for producing article coated with water-repellent...

C - Chemistry, Metallurgy

09

K

C09K 3/18 (2006.01) B32B 9/00 (2006.01) C03C 17/00 (2006.01) C03C 17/30 (2006.01) C09D 4/00 (2006.01)

Patent

CA 2333758

A process for producing an article coated with a water-repellent film which comprises applying a coating fluid obtained by dissolving a silicon alkoxide, a fluoroalkylated silane compound, and an acid in a solvent to a base and drying the coating, characterized in that the coating fluid contains the silicon alkoxide or a hydrolyzate thereof in an amount of 0.01 to 2 wt.% (in terms of silica), the fluoroalkylated silane compound in an amount of 0.00001 to 0.15 wt.% (in terms of silica), the acid in a concentration of 0.003 to 3 N, and 0 to 20 wt.% water. Thus, a water-repellent article having excellent waterdrop repellency and having high marring resistance and weatherability is produced at high efficiency.

Ce procédé, qui sert à produire un article recouvert d'un film hydrofuge, consiste à appliquer sur une base un liquide de revêtement, que l'on obtient en dissolvant un alcoxyde de silicium, un composé au silane fluoroalkylé et un acide dans un solvant, et en faisant sécher ce revêtement. Ce procédé se caractérise en ce que le liquide de revêtement contient l'acoxyde de silicium ou un hydrolysat de celui-ci selon une quantité comprise entre 0,01 et 2 % en poids (en termes de silice), le composé en silane fluoroalkylé selon une quantité comprise entre 0,00001 et 0,15 % en poids (en termes de silice), l'acide selon une concentration comprise entre 0,003 et 3 N, ainsi que 0 à 20 % en poids d'eau. On produit ainsi avec un rendement élevé un article hydrofuge ayant un excellent pouvoir d'hydrofugation et un niveau élevé de résistance aux rayures et de résistance aux intempéries.

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