Self-adhering powder paint based on polyamide and silane for...

C - Chemistry – Metallurgy – 09 – D

Patent

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Details

C09D 5/46 (2006.01) C09D 5/03 (2006.01) C09D 177/00 (2006.01)

Patent

CA 2470147

The invention concerns the use of a powder comprising 99.95 to 95 % of at least a polyamide and 0.05 to 5 % of at least a silane for coating metals. Said powder can be prepared by a simple dry blend of the constituents. The silane can also be added in the molten polyamide in a mixing device and the resulting product reduced to powder. The addition of silane enables to improve significantly electrostatic application by preventing an important part of the powder from falling during the electrostatic discharge which follows application, while providing the coat with lasting adherence on the metal. Advantageously, the silane is selected among aminopropyltriethoxysilane and aminopropyltrimethoxysilane. The invention also concerns a method for coating an object with a film derived from melting a thin layer of said powder.

La présente invention concerne l'utilisation d'une poudre comprenant 99,95 à 95% d'au moins un polyamide et 0,05 à 5% d'au moins un silane pour revêtir des métaux. Cette poudre peut être préparée par simple mélange à sec (dry blend) des constituants. On peut aussi ajouter le silane dans le polyamide à l'état fondu dans un dispositif de mélange et réduire le produit obtenu sous forme de poudre. L'addition d'un silane permet d'améliorer notablement l'application électrostatique en évitant la chute d'une partie importante de la poudre lors de la décharge électrostatique qui suit l'application, tout en procurant au revêtement une adhérence durable sur le métal. Avantageusement le silane est choisi parmi l'aminopropyltriethoxysilane et l'aminopropyltrimethoxysilane. La présente invention concerne aussi un procédé de recouvrement d'un objet par un film provenant de la fusion d'une mince couche de la poudre précédente.

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