Coating for metal surfaces, method for the production...

C - Chemistry – Metallurgy – 09 – D

Patent

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Details

C09D 183/16 (2006.01) C04B 41/49 (2006.01) C08K 3/00 (2006.01) C08K 5/00 (2006.01)

Patent

CA 2557156

A coating for metal surfaces, consisting of a.) optionally, a scratch- resistant perhydropolysilazane base coat and b.) an upper protective layer containing at least one perhydropolysilazane of formula (1) and photocatalytic titanium dioxide (I), wherein n is a whole number and n is dimensioned in such a way that the perhydropolysilazane has a number average molecular weight of 150 -150.000 g/mol. Preferably, the thickness of the protective layer is at least 1 micrometre, more preferably 2 - 20 micrometres. The invention also relates to a method for the production of the coating, in addition to the use thereof as a self-cleaning protective layer, particularly for the rims of automobiles.

L'invention se rapporte à un revêtement pour des surfaces métalliques comprenant : a.) éventuellement une couche à base de perhydropolysilazane résistant à l'abrasion, et ; b.) une couche de protection supérieure contenant au moins un composé perhydropolysilazane de formule (I), dans laquelle n représente un nombre entier et est sélectionné de manière que le composé perhydropolysilazane présente un poids moléculaire moyen en nombre compris entre 150 et 150.000 g/mol, et un dioxyde de titane photocatalytique. La couche de protection présente de préférence une épaisseur au moins égale à 1 micromètre, de préférence comprise entre 2 et 20 micromètres. Cette invention concerne en outre un procédé pour produire ledit revêtement, ainsi que l'utilisation de ce revêtement en tant que couche de protection autonettoyante, en particulier pour des jantes de véhicule automobile.

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