• Journal of the Korean Applied Science and Technology
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• v.26 no.4
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• pp.407-414
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• 2009

Water-in-Oil (W/O) emulsions are widely used in cosmetics. However, O/W (Oil-in-Water) emulsions are generally superior to W/O emulsions in terms of stability. In this study, we investigated the changes of viscosity, the size of emulsion droplets, and rheological properties of emulsions prepared using distearyldimonium chloride (DDC), magnesium aluminum silicate (MAS) and quaternium-18 hectorite (QH). In addition to the changes of the composition, we tested the condition of homogenization including rotation per minute of the mixer and the mixing time. The viscosity of emulsions with DDC and AMS were not changed with time and the stability of emulsions was stable during the storage time. However, the fluidity of emulsions were low due to the forming gel network in the emulsions. The gelling power of the emulsions with QH was rather weaker than that of the emulsions with DDC and MAS. The viscosity of emulsions with QH was gradually reduced and the phase separation of emulsions with high concentration of oil was observed throughout the storage time, however, the stability of emulsions with DDC, MAS and QH was excellent, the fluidity of emulsions was enhanced, and the viscosity of emulsions was sustained for a long time after setting of emulsions.

• Journal of the Society of Cosmetic Scientists of Korea
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• v.29 no.1
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• pp.135-150
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• 2003

This study is described the stabilizing technology of water-in-oil (w/o) emulsion and the mechanism of emulsification with quaternium-18 hectorite (Q-18 HTRT) by swelling action. When Q-18 HTRT is dispersed in oil, it swells and constructs card-house structure adding ethanol, and formation of water phase is caused by hydrogen bonding. The gelling activities of Q-18 HTRT were excellent such as mineral oil, squalane, cetostearyl isononanoate, isostearic acid, cetyl octanoate, octyl dodecanol and so on. Especially, when oil gel containing Q-18 HTRT passed one to three times by Roll mill. It made the W/O emulsion cream (W/O-ECRM) having 2.0 w/w% of Q-18 HTRT and also produced the control sample (control) including 3.0 w/w% of cetyl PEG/PPG- l0/l dimethicone. The stability of after 24 weeks, Hardness of W/O-ECRM dropped 7.48%, whereas hardness of control went down 57 71%. As a result of these test emulsification of W/O-ECRM is superior compared with control. In cosmetic, 0-18 HTRT can use as suspending agent, oil adsorbent, emulsifying agent, dispersing agent, viscosifier and pigment.