STUDY ON PERFORMANCE OF A NOVEL 5 mm/s GRADE PENTAERYTHRITOL ESTER LUBRICANT BASE OIL FOR AERO-ENGINE
MIL-PRF-23699G Enhanced Ester(EE)lubricating oil has become the highest standard to measure the extreme load-carrying properties,and high-temperature oxidation stability.The oxidation stability of dipentaerythritol ester was weaker than that of pentaerythritol ester at high temperature,and long-chain fatty acid could not simultaneously improve the oxidation stability and the extreme load-carrying properties of pentaerythritol ester.A novel structure of 5 mm2/s grade pentaerythritol ester base oil was synthesized by direct esterification of pentaerythritol,adipic acid and C5—Co monounsaturated fatty acids.Compared with current mixed esters of pentaerythritol esters and dipentaergthritol esters,the new pentaerythritol ester base oil had better viscosity-temperature performance,low temperature fluidity and rubber compatibility,and its oxidation induction period and Falex failure load were improved by more than 20％.The existing problems of using dipentaerythritol ester and long chain fatty acid in the existing synthesis technology of 5 mm2/s grade polyol ester base oil were solved.It is expected to provide a reference for the research and development of the next generation of EE-enhanced ester-based aero-engine lubricant oil products.
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