WATER-BASED COATING COMPOSITION

摘要

PROBLEM TO BE SOLVED: To obtain a water-based coating composition which can form a coating film having antibacterial action and the action of adsorbing and decomposing chemical substances and retaining the effects for a long term by mixing a colloidal antibacterial having a specified mean particle diameter and obtained by adhering silver to titanium oxide having photocatalysis with an adsorbent formed from a crystalline layered phosphoric acid compound. SOLUTION: A white slurry obtained by adding ammonia water to an aqueous titanium sulfate solution is filtered to obtain a water-containing cake of titanic acid. After the cake is diluted with pure water, hydrogen peroxide is added to the mixture and is decomposed by heating. A mixture of an aqueous solution of a silver ammine complex salt with an aqueous solution of zirconium ammonium carbonate and a silica sol are added to the mixture to obtain a colloidal antibacterial having a mean particle diameter of 3-500μm and composed of titanium oxide having photocatalysis and silver adhered thereto. 100 pts.wt. (in terms of solid content) coating material is mixed with 0.1-3 pts.wt. (in terms of the solid matter) above antibacterial and 3-55 pts.wt. (in terms of solid content) adsorbent formed from a crystalline layered phosphoric acid compound.