| 摘要 |
PROBLEM TO BE SOLVED: To obtain an antistaining construction material for interior which is resistant to staining even with tobacco tar and/or ash with high-evenness antistaining treatment and durability without hygienic hazard by forming a thin layer of silicate salt on the surface of a construction material having smooth surface and allowing the thin layer to carry a photocatalyst. SOLUTION: A fine powder of a compound of the formula: SiOx (x is 1.5-2.5) having particle sizes of a 2-6μm is dispersed in an organic solvent, directly coated on the surfaces of a construction material having smooth surfaces and heat-treated at 100-800 deg.C depending on the kinds of the construction material to form a sintered thin layer of silicate salt (A1 ). Then, a thin layer of a photocatalyst (A2 ) is supported on the thin layer (A1 ) by the sol-gel technique. In a preferred embodiment, layers A1 and A2 are adjusted in their thickness to 0.01-1μm, respectively. In addition, an antimicrobial is contained in the thin layer A2 .
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