Multilayer lacquering process

C - Chemistry – Metallurgy – 25 – D

Patent

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Details

C25D 13/06 (2006.01) B05D 7/00 (2006.01) B05D 7/16 (2006.01) C25D 13/22 (2006.01)

Patent

CA 2222798

Process for producing a multilayer lacquer coating, in which a primer of an electrophoretically depositable aqueous coating agent (1) is electrophoretically applied on to an electrically conductive substrate and is then stoved, whereupon a colour-giving and/or effect-producing base lacquer coat of an aqueous coating agent (II) is applied and stoved and this coat is then provided with one or more clear lacquer coatings, in which process a) as the coating agent (I), a coating agent which, in the stoved state, will produce an electrically conductive primary coat is used, b) the base lacquer coat is formed by an electrophoretically depositable aqueous coating agent (II) by a process of electrophoretical deposition, c) the overall dry layer thickness of the dry lacquer coat or dry lacquer coats is about 40 and 80 µm, and d) the overall dry layer thickness of the multilayer lacquer coating is about 80 to 110 µm.

Procédé de production d'un revêtement multicouche laqué, selon lequel une couche de base d'un produit de revêtement aqueux (I) est déposée par électrophorèse sur un substrat conducteur d'électricité puis est cuite au four. On applique ensuite sur ce substrat une couche d'un revêtement aqueux laqué (II) colorant et/ou produisant un certain effet et qui est cuite au four, et sur cette dernière couche, on rajoute au moins une couche de laque clair. Au cours de ce procédé, (a) on utilise un matériau (I) qui, lorsque cuit au four, produit un revêtement primaire conducteur d'électricité; b) le revêtement laqué de base est formé d'un produit de revêtement (II) aqueux déposé par électrophorèse; c) le revêtement laqué sec atteint une épaisseur d'environ 40 à 80 micromètres; d) l'épaisseur du revêtement multicouche laqué sec atteint environ 80 à 100 micromètres.

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