Journal of the Society of Cosmetic Scientists of Korea (대한화장품학회지)

Society of Cosmetic Scientists of Korea (대한화장품학회)
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Synergistic Interaction in W/O and W/S Emulsions Stabilized by a Mixture of Powders and Surfactant

분체와 유화제의 상호 관계성에 기인한 저점도 W/O 및 W/S 에멀젼의 안정성 연구

  • 인소현 ((주) LG 생활건강 기술연구원) ;
  • 조환일 ((주) LG 생활건강 기술연구원) ;
  • 강내규 ((주) LG 생활건강 기술연구원) ;
  • 한종섭 ((주) LG 생활건강 기술연구원) ;
  • 박선규 ((주) LG 생활건강 기술연구원) ;
  • 이천구 ((주) LG 생활건강 기술연구원)
  • Received : 2016.01.05
  • Accepted : 2016.03.17
  • Published : 2016.03.30
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Abstract

Water-in-oil emulsions including water-in-ester oil and water-in-silicone oil (W/O+S) have various advantages such as blocking moisture evaporation and forming air permeable membrane. However, their applications have been limited due to the poor stability under low viscosity condition. In this study, we investigated the effect of synergistic interaction between nonionic surfactant, micro-size particles and cationic surfactant on the stability of W/O+S formulation. The stability of W/O+S emulsions was changed as a function of cationic surfactant concentration where it increased at lower concentration and then started to decrease above a critical point. Finally, emulsion phase inversion occurred at a high concentration. The results suggest that W/O+S emulsions of low viscosity ranging from 2000 to 5000 cps can be stabilized under the conditions where a nonionic surfactant, micro-size particles and a cationic surfactant are used in the range of 1.0 ~ 4.0 wt%, 2.5 wt% and 0.1 ~ 0.5 wt%, respectively.

유중 수형 에멀젼은 우수한 수분 증발 차단력 및 통기성 밀폐막 형성 등의 장점에도 불구하고 저점도 안정화가 쉽지 않아 다양한 화장품 제형 적용에 한계성을 지녀왔다. 본 연구에서는 유중 수형 에멀젼 형성에 있어 비이온성 유화제와 분체, 양이온성 유화제 간의 상호 관계가 제형의 안정성에 미치는 영향을 규명하였다. 비이온성 유화제와 분체 존재 하에 양이온 유화제의 농도가 증가함에 따라 초기에는 유화 안정성이 향상되다가 일정 농도 이상에서는 하락되고, 더욱 농도가 증가하면 전상이 일어나는 경향성이 관찰되었다. 이를 통해, 비이온성 유화제 1.0 ~ 4.0 wt% 사용 조건에서 실리콘 계 마이크로 사이즈 분체 2.5 wt%와 양이온 유화제 0.1 ~ 0.5 wt%를 사용할 경우 흐름성 있는 범위의 점도까지(2000 ~ 5000 cps) 낮추면서도 분체의 분산성과 안정성을 효과적으로 높인 유중 수형 에멀젼의 제조가 가능함을 확인하였다.

Keywords

References

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