Proceedings of the Korean Society of Tribologists and Lubrication Engineers Conference (한국윤활학회:학술대회논문집)

Korean Tribology Society (한국트라이볼로지학회)
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A study on Biodegradability of Vegetable Oil based EP Grease

식물유계 EP그리스의 생분해도 평가에 관한 연구

  • Nam Kyung-Im (Surfactant & Lubricant Research Team, Applied Chemistry Research Group, Korea Research Institute of Chemical Technology) ;
  • Kim Young-wun (Surfactant & Lubricant Research Team, Applied Chemistry Research Group, Korea Research Institute of Chemical Technology) ;
  • Chung Keunwo (Surfactant & Lubricant Research Team, Applied Chemistry Research Group, Korea Research Institute of Chemical Technology) ;
  • Cho Wonoh (R&D Center, ChangAm L&S Co. Ltd.) ;
  • Jeon In-sik (R&D Center, ChangAm L&S Co. Ltd.) ;
  • Chung Yong-Mi (R&D Center, ChangAm L&S Co. Ltd.)
  • 남경임 (한국화학연구원 응용화학연구부 유제화학연구센타) ;
  • 김영운 (한국화학연구원 응용화학연구부 유제화학연구센타) ;
  • 정근우 (한국화학연구원 응용화학연구부 유제화학연구센타) ;
  • 조원오 (장암엘에스(주) 기술연구소) ;
  • 전인식 (장암엘에스(주) 기술연구소) ;
  • 정용미 (장암엘에스(주) 기술연구소)
  • Published : 2003.11.01
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Abstract

In this study, biodegradable base Li-greases were prepared by using Li-soap thickener and vegetable oils such as soybean oil, rapeseed oil, castor oil and synthetic ester. Also, EP-greases were formulated by blending base Li-greases, anti-wear additives, EP additives, anti-oxidants and corrosion inhibitor etc. And EP-greases were characterized by analysing physical properties such as worked penetration, dropping point, 4-ball wear, extreme pressure, thermal properties etc. Biodegradability of base Li-greases and EP-greases were evaluated by CEC-L-33-A-93 method using several inoculums of domestic sewage treatment plant. As the results, biodegradability of vegetable oils were shown at the range of 97.1 to $98.4\%$. And biodegradability of base Li-greases and EP-greases were $86.2\%\;\~\;89.3\%\;and\;83.4\%\;\~\;90.0\%$ which were lower value than those o( vegetable oils due to effect of Li-soap thickener, respectively. Therefore, the EP-greases prepared in this study were easily biodegraded by microorgnism.

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