Adhesion promotion

C - Chemistry – Metallurgy – 03 – C

Patent

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Details

C03C 17/34 (2006.01) C03C 23/00 (2006.01)

Patent

CA 2346368

Adhesion of a thermosetting powder coating to a glass substrate surface using a silane adhesion promoter, is enhanced by modifying the pH of the glass surface to between 3.5 and 5, prior to, or during, the action of the promoter. The pH-modification may be effected during washing of the surface prior to spray-application of the promoter, or by including an acid or alkali modifier in the silane solution. Alternatively, the silane, or the silane and the modifier, may be included in the thermosetting powder to become active during fusing of the powder to the glass surface. An acid or alkali solution dried on the surface prior to application of the promoter for activation with the promoter on heating, may be used instead or in addition.

Selon cette invention, on améliore l'adhérence d'une poudre thermodurcissable à la surface d'un substrat de verre au moyen d'un promoteur d'adhérence à base de silane en portant le pH de la surface du verre à une valeur comprise entre 3,5 et 5, et ce avant, pendant ou après l'action du promoteur. On peut modifier le pH lors du lavage de la surface qui précède l'application du promoteur par pulvérisation ou en incorporant à la solution de silane un modificateur acide ou alcalin. En variante, on peut incorporer à la poudre thermodurcissable le silane, ou le silane et le modificateur, de manière à ce que ces derniers deviennent actifs lors de la fusion de la poudre et de la surface en verre. Comme alternative ou en guise de complément, on peut utiliser une solution acide ou alcaline séchée à la surface avant l'application du promoteur et destinée à s'activer avec le promoteur sous l'effet de la chaleur.

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