| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To develop an aqueous primer enabling recoat, particularly recoat in the same coating system of aqueous primer-aqueous based coating-two pack type acryl/polyisocyanate-curing top clear by finding such aqueous primer formulation as to enable recoat in same coating system in 3-wet coating system (3-coat 1-bake (3C1B) method) and taking measures to defect in the primer formulation. <P>SOLUTION: This aqueous primer for recoat is used for a coating film-forming method which comprises carrying out coating film formation comprising a step (a first coat) of applying an aqueous primer coating onto a member to be coated, a step (a second coat) of applying an aqueous base coating to a member in which the aqueous primer is kept in a wet state, a step (a third coat) of applying a clear coating to a member in wet state in which base coat has been carried out and a step (baking step) of baking and curing the coated three layers (first, second and third coat layers) at once and further carrying out recoat on the three layers, and the aqueous primer comprises (A) 20-35 pts.wt. chlorinated polyolefin emulsion, (B) 15-35 pts.wt. sulfonic acid group-containing polyurethane dispersion, (C) 20-35 pts.wt. epoxy group-containing acryl emulsion, (D) 5-15 pts.wt. curing agent and (E) 5-35 pts.wt. pigment-dispersing resin, based on 100 pts.wt. total solid content of (A), (B), (C), (D) and (E), and (F) a thickener and (G) a small amount of hydrophobic high-boiling point solvent. <P>COPYRIGHT: (C)2009,JPO&INPIT</p> |
