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KMID : 0604520210470040273
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Journal of the Society of Cosmetic Scientists of Korea
2021 Volume.47 No. 4 p.273 ~ p.280
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A Study on the Emulsifying Stability of W/O Type Sunscreen Cream by the Hansen Solubility Parameter
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Kim Dong-Hee
Lee Jin-Jae
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Abstract
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The water resistance is important factor for sunscreen formulations. Generally a sunscreen cream was formulated by a water-in-oil (W/O) emulsion. In the W/O emulsion system, silicone oils are added to improve the texture of formulations.
Silicone oils have low compatibility with organic sunscreen agent, causing problems with the stability in emulsion. In this study, the compatibility between various oils in the W/O emulsion was derived numerically using Hansen solubility parameter (HSP) at first. HSP is represented a dispersion degree, a polarity, and a hydrgen bond in a composition.
In this study, various emulsions were prepared according to the types of oils with different HSP values and then monitored by a viscosity and morphology according to the time and temperature. The HSP values of components and the experimental results have similar activities for the stability of emulsions. HSP made it easy to select oil with high compatibility. When the compatibility of the oil phase in the W/O emulsion was high, the viscosity change over time was small. The stability was improved under the freeze-thaw cycle (-15 ℃ ∼ 45 ℃). In the future, if the composition of the ingredients is optimized through HSP, it is expected that it will be helpful in the development of W/O type sunscreen formulations that are excellent in use and stability.
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KEYWORD
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HSP, W/O emulsion, stability, compatibility, sunscreen
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