| 摘要 |
<p>Disclosed is an aqueous surface-treating agent having excellent corrosion resistance, adhesion properties, stain-proof properties, film-forming properties, ultraviolet ray resistance, alkali resistance, acid resistance, processability and storage stability. Specifically disclosed is an aqueous metal-surface-treating agent comprising the following components (A) to (E): (A) a Zr compound and/or a metal oxide zol; (B) a hydrolyzable silyl compound; (C) a polymer which has polymerization units derived from (c1) a (meth)acrylic acid ester having a specific structure, (c2) a silicon-containing monomer, (c3) an a,ß-ethylenically unsaturated carboxylic acid and (c4) another (meth)acrylic acid ester, does not contain any unsaturated bond other than a bond contained in a carbonyl group in its molecule, and has a specified Tg, a specified MFT and a specified acid value; (D) a plasticizer; and (E) an emulsifying agent, wherein the ratio of the total mass (M) of a metal or metals in the component (A) to the sum total of the mass (Si1) of silicon in the component (B) and the mass (Si2) of silicon in the component (c2) [i.e., a M/(Si1+Si2) ratio] and a Si1/Si2 ratio have specified values, and wherein the component (C) is contained in an amount of 40 to 98 mass% relative to the total solid content. Also specifically disclosed is a surface-treated metal material.</p> |
