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KMID : 1023120110090020001
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Korean Journal of Aesthetic Society
2011 Volume.9 No. 2 p.1 ~ p.8
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The Optical Characteristics of Titanium Dioxide and UV-block Effect
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Zhoh Choon-Koo
Kwon Hye-Jin
Ahn Sun-Rye
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Abstract
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In order to develop a new ultraviolet ray blocking material that will protect the skin from ultraviolet rays that are known to be the primary cause of skin aging and complement the weakness of existing ultraviolet ray scattering agents that had to be used in large amounts, the optical characteristics of titanium dioxide powder which is the major material of ultraviolet ray scattering agents relative to its shapes were analyzed and the correlations between the characteristics and the effect to block ultraviolet rays were examined. The optical characteristics of individual powder types of four different titanium dioxide products currently commercialized were analyzed. Then, W/O emulsions mixed with titanium dioxide in a 5% weight ratio were made and their in vitro SPF and PA values were measured. Among the four types of titanium dioxide with different shapes, ST-485 showed the highest UV Absorbance value in the area of ultraviolet rays followed by ST-455, ST-495 and P-25 in order of precedence and in the case of UV Reflectance values, ST-495 showed the highest value followed by P-25, ST485 and ST-455. In addition, it could be seen that when the UV Absorbance value of the powder was higher, the sun protection factor (SPF) value of the powder was also higher and that when the UV Reflectance value of the powder was higher, the protection grade of UVA (PA) of the powder was also higher.
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KEYWORD
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TiO2, UV-block, SPF, UV-absorbance, UV-reflectance
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