Water-repellent surface treatment

C - Chemistry – Metallurgy – 03 – C

Patent

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Details

117/96

C03C 17/30 (2006.01) C03C 15/00 (2006.01) C03C 17/32 (2006.01) C03C 19/00 (2006.01)

Patent

CA 2333450

The present invention relates to a method of improving the durability of water- repellent films deposited on the surface of a substrate and to a coated article having water-repellent film of improved durability deposited on the substrate surface. The method includes the steps of simultaneously abrasively and chemically preparing the surface to expose an increased number of bonding sites on the substrate surface by applying a dispersion including an acid solution and an abrasive material to the surface. The dispersion is then removed and the water-repellent film is formed over the prepared surface. The bonding sites react with the water-repellent film to more effectively bond the film to the substrate and thereby improve the durability of the water- repellent film. The abrading material is preferably selected from the group consisting of alumina, ceria, iron oxide, garnet, zirconia, silica, silicon carbide, chromic oxide, pumice and diamond, and the acid solution is preferably selected from the group consisting of solutions of hydrochloric acid, sulfuric acid, tartaric acid, phosphoric acid, hydrobromic acid, nitric acid, acetic acid, trifluoroacetic acid, oxalic acid and citric acid.

L'invention concerne un procédé pour améliorer la durabilité de films hydrophobes déposés à la surface d'un substrat ainsi qu'un article enrobé qui possède un film hydrophobe à durabilité amélioré, déposé à la surface d'un substrat. Le procédé consiste à préparer la surface, simultanément par abrasion et par action chimique, pour qu'elle expose un nombre accru de sites de liaison à la surface du substrat par application à la surface d'une dispersion qui comprend une solution acide et une substance abrasive. On évacue ensuite la dispersion et l'on forme à la surface dûment préparée le film hydrophobe. Les sites de liaison entrent en réaction avec le film hydrophobe et lient le film au substrat avec une efficacité accrue, ce qui permet d'améliorer la durabilité du film hydrophobe. La substance abrasive est de préférence sélectionnée dans le groupe qui comprend l'alumine, l'oxyde cérique, l'oxyde de fer, le grenat, le zircone, la silice, le carbure de silicium, l'oxyde de chrome, la ponce et le diamant, la solution acide étant de préférence sélectionnée dans le groupe comprenant les solutions d'acide chlorhydrique, l'acide sulfurique, l'acide tartrique, l'acide phosphorique, l'acide bromhydrique, l'acide nitrique, l'acide acétique, l'acide trifluoroacétique, l'acide oxalique et l'acide citrique.

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