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A Study on Emulsion Stability of O/W and W/S Emulsion according to HLB of Emulsifier

유화제의 HLB에 따른 O/W 및 W/S 에멀젼의 유화 안정성에 관한 연구

  • Yeon, Jae Young (Cosmetic Research Institute, Hanbul Cosmetics Co., Ltd.) ;
  • Shin, Bo Ram (Cosmetic Research Institute, Hanbul Cosmetics Co., Ltd.) ;
  • Kim, Ta Gon (Cosmetic Research Institute, Hanbul Cosmetics Co., Ltd.) ;
  • Seo, Jeong Min (Cosmetic Research Institute, Hanbul Cosmetics Co., Ltd.) ;
  • Lee, Cheong Hee (Cosmetic Research Institute, Hanbul Cosmetics Co., Ltd.) ;
  • Lee, Sang Gil (Cosmetic Research Institute, Hanbul Cosmetics Co., Ltd.) ;
  • Pyo, Hyeong Bae (Cosmetic Research Institute, Hanbul Cosmetics Co., Ltd.)
  • 연제영 (한불화장품(주) 기술연구원 화장품연구소) ;
  • 신보람 (한불화장품(주) 기술연구원 화장품연구소) ;
  • 김타곤 (한불화장품(주) 기술연구원 화장품연구소) ;
  • 서정민 (한불화장품(주) 기술연구원 화장품연구소) ;
  • 이청희 (한불화장품(주) 기술연구원 화장품연구소) ;
  • 이상길 (한불화장품(주) 기술연구원 화장품연구소) ;
  • 표형배 (한불화장품(주) 기술연구원 화장품연구소)
  • Received : 2014.02.24
  • Accepted : 2014.04.01
  • Published : 2014.09.30

Abstract

In this study, O/W and W/S emulsions were prepared by combining oils having different required hydrophilic lipophilic balance (HLB) values under the diverse conditions of HLB values composed of a hydrophilic surfactant and a lipophilic surfactant and their stability was investigated. Results showed that the higher the viscosity of O/W emulsions was as the lower the HLB value of emulsifier and emulsion particle showed a tendency to be a smaller and compact and stabler in centrifugal filtration. W/S emulsions also showed a similar tendency to be a smaller and compact as HLB values of emulsifier was higher and stabler in centrifugal filtration. However, the viscosity of W/S emulsion tended to get lower in HLB conditions of all emulsifiers as the time passed. This indicated that the emulsions had an unstable feature in long-term stability. In conclusion, the results showed opposite to the known theory that O/W emulsion is proper to be applied by nonionic surfactant with a high HLB value and W/S emulsion to be applied by nonionic surfactant with a low HLB value and provide useful information for the cosmetics research and related areas.

본 연구에서는 친수성 계면활성제와 친유성 계면활성제가 조합된 다양한 HLB (Hydrophilic Lipophilic Balance) 값을 갖는 유화 시스템의 조건에서, required HLB 값이 각기 다른 오일들을 적용하여 제조한 O/W 및 W/S 에멀젼들의 특성 및 유화 안정성을 조사해 보았다. 그 결과 O/W 에멀젼은 유화제의 HLB 값이 낮을수록 점도가 높고, 유화입자는 작고 조밀한 경향을 나타내었으며, 원심분리에서도 더 안정한 경향을 나타내었다. W/S 에멀젼은 유화제의 HLB 값이 높을수록 유화입자는 작고 조밀해지는 경향을 나타내었으며, 원심분리에서도 더 안정한 경향을 나타내었다. 그러나 W/S 에멀젼은 시간이 경과할수록 모든 유화제의 HLB 조건에서 점도가 낮아지는 경향이 나타나 장기 안정도에서는 불안정한 특성을 나타내었다. 이번 연구의 결과는 O/W 에멀젼은 HLB 값이 높은 비이온 계면활성제의 적용이 적합하며 W/S 에멀젼은 HLB 값이 낮은 비이온 계면활성제의 적용이 적합하다는 기본 이론과 상반되는 결과로서 앞으로의 화장품 연구 개발 시 유용한 연구 자료가 될 것으로 사료된다.

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