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KMID : 0604520190450030237
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Journal of the Society of Cosmetic Scientists of Korea
2019 Volume.45 No. 3 p.237 ~ p.254
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Factors Affecting Physical Properties of Solid Sunscreen Using Response Surface Methodology
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Ryu Sang-Deok
Heo Min-Geun
Yoon Kyung-Sup
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Abstract
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This study is focused on the effect of sodium stearate, which is a hydrophilic gelling agent affecting on the hardness of O/W solid sunscreen cosmetic. The sunscreen of the O/W (oil in water) type is stable, good in use, and relatively easier to stabilize than the sunscreen of the W/O (water in oil) type. Methods for increasing the stability by using emulsifiers, electrolytes, and wax or oil have been studied for solid sunscreen. This study was intended to develop a solid sunscreen stabilized by increasing the hardness using sodium stearate as an O/W type containing more than 40% moisture. Response surface methodology (RSM) was used to analyze the factors affecting the hardness of cosmetics, and sodium stearate, polyol and oil were used for each factor. The hardness and the reaction value was measured using a rheometer. As a result, sodium stearate showed a meaningful value (p < 0.05) among the three factors affecting hardness. In addition, the use of sodium stearate as a hydrophilic gelling agent increased the usability and stability of the solid sunscreen.
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KEYWORD
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sodium stearate, response surface methodology (RSM), solid sunscreen cosmetics, rheometer, hardness
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