Influence of a Silicone Surfactant in a W/O Emulsion Containing an Organoclay

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  • 有機変性粘土鉱物を配合したW/Oエマルションにおけるシリコーン界面活性剤の影響

Abstract

<p>W/O emulsions using silicone are used in cosmetics because they are water resistant, spread well and are not sticky. Organoclay is a useful thickener that forms a thixotropic oil gel with polarized materials such as surfactants. But its viscosity changes with the surfactant's amount. Disteardimonium hectorite is generally used in cosmetics. Since it is modified with a long-chain alkyl group, it is incompatible with silicone oil. Therefore, a silicone surfactant is used for silicone-based W/O emulsions with organoclays. Water, oil and powder are used in liquid foundations, there are many interfaces. The interfaces also affect the function of surfactants and thickeners. Therefore, in formulation design, it is difficult to understand why changes in viscosity and stability are caused. This study first investigated the thickening mechanism of silicone oil gels. Next I studied how a silicone surfactant affects the viscosity of W/O emulsions containing organoclays. As a result, I discovered that W/O emulsion viscosity becomes maximum a certain amount of the surfactant and is not easily affected by the storage temperature. However, if the surfactant's amount exceeds that amount, the thickening mechanism is interfered with and a high-viscosity emulsion cannot be obtained. When the emulsion with the excess amount of the surfactant is kept at high temperatures, the interference disappears and the emulsion viscosity becomes high.</p>

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