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Wear, Oxidation and Shear Characteristics of Mixed Lubricating Oil (Mineral/Vegetable oil) with ZnDTP

ZnDTP를 첨가한 혼합윤활유(광유/식물성 오일)의 마모, 산화 및 전단 특성

  • Lim, TaeYoon (Dept. of Lubricants, R&D Institute, Hyundai Oilbank) ;
  • Kim, YangHoe (Dept. of Lubricants, R&D Institute, Hyundai Oilbank) ;
  • Na, Byung-Ki (Dept. of Chemical Engineering, Chungbuk National University)
  • 임태윤 (현대오일뱅크 윤활유연구소) ;
  • 김양회 (현대오일뱅크 윤활유연구소) ;
  • 나병기 (충북대학교 화학공학과)
  • Received : 2017.01.31
  • Accepted : 2018.06.20
  • Published : 2018.08.31

Abstract

Vegetable oils can contribute to the goal of energy independence and security owing to their naturally renewable resources. One of the representative vegetable oils is biodiesel, which is being used in domestic and European markets as a blended fuel with automotive diesel. Vegetable oils are promising candidates as base fluids to replace petroleum lubricants because of their excellent lubricity and biodegradability. We prepared biodiesel with a purity of 99.9% via the esterification of waste cooking oil. Blended biodiesel and Petro-lube base oil were mixed to produce five types of mixed lubricating oil. We analyzed the various characteristics of the blended biodiesel with Petro-lube base oil for different blending ratios. The lubricity of the vegetable lubricant improves as the content of biodiesel increases. In addition, since zinc dialkyldithiophosphates (ZnDTPs) are widely used as multifunctional additives in petroleum-based lubricants, we optimized the blending ratio for lubricity, oxidation stability, and shear stability by adding ZnDTP as a performance additive to improve the biodiesel properties, such as oxidation stability and hydrolysis. The optimized lubricants improve by approximately 25% in lubricity and by 20 times in oxidation stability and shear stability after the addition of ZnDTP.

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