2008 Volume 20 Issue 2 Pages 70-76
Effect of photocatalyst TiO2 on weatherability of poly (vinyl chloride) sheets was investigated and the following results were obtained. On both artificial light exposure and natural exposure, total transmittance (Tt) of the samples with photocatalyst TiO2 on the surface was higher than that of uncoated one. Parallel transmittance (Tp) of the coated samples was larger than that of uncoated one during the natural exposure. On the artificial light exposure, parallel transmittance of uncoated one was larger than that of the coated samples. On the natural exposure, diffuse transmittance (Td) and Haze value of uncoated one were larger than that of the coated samples. On the artificial light exposure, Td and Haze values of the coated samples were larger than that of uncoated one. These conversely results between the natural and artificial light exposure were probably caused by difference between the experimental conditions of light irradiation and the supply water so on. As mentioned above, it was confirmed that weatherability of sheets increases and the life of sheets becomes longer by means of coating photocatalyst TiO2 on poly (vinyl chloride) sheets.
