| 摘要 |
PURPOSE:The title composition that is obtained by dispersing a water-insoluble inorganic powder in an aqueous solution containing PVA, zirconium nitrate, a water-soluble melamine resin and a curing agent therefor, thus showing good water-wetting properties, high resistance to corrosion, good precessability and high resistance to solvent. CONSTITUTION:For example, PVA, preferably completely saponified, and zirconium nitrate are dissolved in water to prepare solution A. Meanwhile, a water-soluble melamine resin and a curing agent therefor such as ammonium chloride are dissolved in water to prepare solution B. Then, the solution A is mixed with the solution B and a water-insoluble inorganic powder such as colloidal silica, when needed, in addition, a metal-chelating agent, pigments, dyes, thickener and so on are added to the mixture, stirred, deaerated to give the objective composition. The amount of zirconium nitrate is preferably 4-7pts.wt. and melamine resin is preferably 80-180pts.wt. per 100pts.wt. of PVA, respectively.
|
