| 摘要 |
PURPOSE:To obtain treated pigment having high water repellency and improved dispersibility, by dispersing completely pigment togehter with a salt soluble in fatty acid into water, dropping slowly an aqueous solution of a soluble salt of Al, Mg, Ti, etc., orientating and adsorbing a formed metal salt on the surface of pigment. CONSTITUTION:Pigment (e.g., titanium oxide, black iron oxide, dolomite pieces) is suspended in water at 3-35wt% concentration, a salt soluble in fatty acid in an amount corresponding to 0.5-10wt% based on the pigment is added to it, it is fully stirred under heating at 40-60 deg.C in the case of necessity so that the pigment is completely dispersed. 1-30wt% aqueous solution of soluble salt such as Al, Mg, Ca, Zn, Zr, Ti, etc. is added slowly to the suspension in such a way that the amont of the soluble salt is 1-3 equivalents based on the salt soluble in fatty acid, to give the pigment wherein the formed metal salt of fatty acid is orientated and adsorbed on the surface of it. Since the metal soup and the pigment do not only coexist, long-time stirring, etc. are not required, the pigment is provided with sufficient water repellency with a small amount of the metal soup. |
