| 摘要 |
<p>The present invention provides a coating method which can be applied in a simple operation, which can form a coating film greatly superior in finish appearance, corrosion resistance, wheatherability, chipping resistance, acid resistance, abrasion resistance, etc., and which is advantageous in resource saving and pollution control. The coating method comprises: applying, onto a material to be coated, a cationic electrodepositable coating composition comprising: (A) a polyurethane-modified epoxy resin-amine adduct obtained by a reaction of (A-1) a polyurethane compound having one terminal isocyanate group in the molecule, obtained by a reaction of (a) a polyhydroxy compound having a number-average molecular weight of 50-8,000, (b) a polyisocyanate compound, and (c) a compound having one active hydrogen atom in the molecule; (A-2) a bisphenol type epoxy resin having at least two epoxy groups in the molecule; and (A-3) an active-hydrogen-containing amine compound, and (B) a nonionic film-forming resin, the weight ratio of the resin (A)/the resin (B) being 15/85 to 95/5 and the coating composition comprising substantially no pigment, then heat-curing the formed electrocoating film, and thereafter applying, onto the cured electrocoating film, an aqueous coating composition comprising a metallic pigment and/or a coloring pigment and a high-solid-content coating composition comprising: (C) a carboxyl group-containing compound, (D) a vinyl type polymer containing, in the molecule, an epoxy group, a hydroxyl group and a hydrolyzable alkoxysilyl group, (E) a reactive organopolysiloxane, and (F) crosslinked polymer fine particles but comprising substantially no pigment, by two-coat two-bake or by two-coat one-bake. e</p> |
