| 이산화티탄 분체의 광학적 특성과 자외선 차단효과 |
| 조춘구, 권혜진, 안선례 |
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| The Optical Characteristics of Titanium Dioxide and UV-block Effect |
| Choon-Koo Zhoh, Hye-Jin Kwon, Sun-Rye Ahn |
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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. |
| Key words:
TiO2, UV-block, SPF, UV-absorbance, UV-reflectance |
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