| abstract |
An object of the present invention is to provide a method for preparing a cationic electrodeposition coating composition, which contains a bismuth compound and exhibits excellent coating stability, curing performance, coating film appearance, and the like. The present invention provides a method for preparing a cationic electrodeposition coating composition, comprising the step of mixing a resin emulsion (i) and a pigment dispersion slurry, wherein the resin emulsion (i) comprises an aminated resin (A) and blocked isocyanate curing Agent (B), the above-mentioned pigment dispersion slurry comprises: a bismuth mixture (C) obtained by mixing a bismuth compound (c1) and an organic acid (c2) in advance, a pigment dispersion resin (D), an amine-modified epoxy resin containing (E) The amine-modified epoxy resin emulsion (ii) and the pigment (F), the above-mentioned pigment dispersion resin (D) has a hydroxyl value of 20 to 120 mg KOH/g, and the above-mentioned amine-modified epoxy resin (E) The hydroxyl value of 150~650 mg KOH/g. |