| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for forming an ultra-hydrophilic thin film on the surface of the outer wall of a building by which the ultra-hydrophilic thin film can be uniformly formed on the surface of the outer wall and an advantage in low-cost application is ensured. SOLUTION: Fine particles of a photocatalyst (titanium dioxide) are mixed with a mixed solution of water and a solvent such as an alcohol to prepare a thin film forming solution. An organic compound type color former that is made colorless by oxidation by the photocatalyst is mixed with the thin film forming solution to impart a visible color to the thin film forming solution. This thin film forming solution is sprayed on the surface of the outer wall of a building while watering the sprayed state. By this method, the thin film forming solution can be uniformly sprayed on the surface of the outer wall with no unevenness. The sprayed solution is then dried to uniformly form the objective ultra-hydrophilic thin film over the entire surface of the outer wall.
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