화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Journal of the Korean Industrial and Engineering Chemistry, Vol.16, No.6, 778-784, December, 2005
Export Citation
Alkyl Ethoxylate 비이온 계면활성제, 물과 윤활유를 포함한 시스템에서 보조계면활성제가 중간상 생성에 미치는 영향에 관한 연구
Effect of Cosurfactant on Intermediate Phase Formation in Systems Containing Alkyl Ethoxylate Nonionic Surfactant, Water and Lubricant
임종주†
  • 동국대학교 공과대학 생명ㆍ화학공학과
Jong Choo Lim†
  • Department of Chemical and Biochemical Engineering, Dongguk University, Seoul 100-715, Korea
E-mail:
초록
Alkyl ethoxylate 비이온 계면활성제, 산업용 윤활유, 물로 이루어진 3성분 계에 대하여 30~60 ℃의 온도 범위에서 상평형 실험을 수행한 결과, 세정력에 중요한 영향을 끼치는 가운데 상의(middle-phase) 마이크로에멀젼(μE) D상은 매우 제한된 조건 하에서만 생성되며, 따라서 D상이 보다 넓은 온도 영역에서 형성되기 위해서는 보조계면활성제 첨가가 필수적임을 알 수 있었다. 비이온 계면활성제 C12E4 시스템에 n-펜탄올과 n-헥산올을 보조계면활성제로 각각 첨가함에 따라 3상이 형성되는 온도는 A/S 증가에 따라 감소하였으나 3상 영역에 n-펜탄올을 첨가한 경우에는 D'상이 형성되었으며, 반면에 n-헵탄올, 옥탄올, 노난올 등을 첨가할 경우에는 D상이 형성되었다. 한편 보조계면활성제로 n-헥산올을 첨가한 경우에는 30~40 ℃의 온도 범위에서는 D'상을 형성하며, 45~60 ℃의 온도 범위에서는 D상이 형성되었다. 두 비이온 계면활성제 시스템의 차이는 거대한 윤활유 오일 분자가 계면활성제 필름 지역으로 관통하여 가용화될 수 있는 정도와 계면활성제의 오일 상에 대한 분배에 주로 기인하는 것으로 생각된다.
It has been found that the addition of cosurfactant is necessary in order to expand three phase region containing middle phase microemulsion in ternary systems containing alkyl ethoxylate (AEO) nonionic surfactant, commercial lubricant and water. Phase behavior in the surfactant systems with addition of cosurfactant over a temperature range of 30 to 60 ℃ showed different trends depending on surfactant, temperature and chain length of alcohol added. For the C12E4 system, addition of n-pentanol and n-hexanol both produced a three phase region over a wide range of temperatures but the middle-phase formed was found to be a L3 or D' phase which would not facilitate solubilization of high molecular weight lubricants. On the other hand, for the C12E5 system, the middle-phase microemulsion was found to be formed with addition of a rather long-chain alcohol such as n-hexanol, n-heptanol, n-octanol, or n-nonanol. The results shown with the addition of cosurfactant was understood in connection with interfacial tension measurements and composition analysis. The inability of the hydrocarbon region of the surfactant films to incorporate the large lubricant molecules and high solubility of a hydrophobic surfactant are thought to be the chief reasons for poor solubilization with D' phase.
Keywords:nonionic surfactant;cosurfactant;middle-phase microemulsion D phase;L3 phase;interfacial tension
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