Influence of Particle Size of Titanium Dioxide on UV-ray Shielding Property [Translated]

The influence of particle size (0.019-0.24 μm) of TiO2 on UV-ray shielding capability was studied. UV-ray shielding capability of TiO2 depended on the wavelength. That is, the smaller the primary particle size was, the greater its shielding capability against around 300 nm of UV-B range was. On the contrary, for the shielding capability against around 350 nm of UV-A range, an optimum primary particle size was found. Furthermore, the optimum primary particle size varied, depending on dispersion strength of the particles in a paint. † This report was originally printed in Journal of the Japan Society of Colour Material 68(4), 203-210 (1995) in Japanese, before being translated into English by KONA Editorial Committee with the permission of the editorial committee of the Japan Society of Colour Material.