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Synthesis and evaluation of a protic ionic liquid as a multifunctional lubricant additive

  • Cheng Jiang
  • Yanan Wang
  • Huaigang Su
  • Weimin LiEmail author
  • Wenjing LouEmail author
  • Xiaobo Wang
Open Access
Research Article


An oil soluble multifunctional protic ionic liquid (IL) was synthesized and its tribological and antioxidant properties in poly alpha olefin (PAO4) were investigated. The tribological results demonstrated that the IL significantly reduced friction and wear of PAO4. The PAO4 blend with IL resulted in an induced oxidation time of 555 min which is 8.2 and 3.5 times higher than that of pure PAO4 and PAO4 with zinc dialkyl dithiophosphate (ZDDP) for the rotating pressure vessel oxidation test. It is likely that free nonylated diphenylamine acted as a radical scavenger to enhance antioxidant performance, while free bis(2-ethylhexyl) phosphate was more prone to adsorb and react with the metal surface to form a phosphorus-rich tribofilm in order to protect the rubbing surface.


ionic liquid friction reducing anti-wear antioxidant multifunctional additive 



The authors gratefully acknowledge the financial support of the National Natural Science Foundation of China (Grant Nos. 51605471, 51505460 and 51775536).


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Authors and Affiliations

  1. 1.State Key Laboratory of Solid LubricationLanzhou Institute of Chemical Physics, Chinese Academy of SciencesLanzhouChina
  2. 2.Qingdao Center of Resource Chemistry & New MaterialsQingdaoChina

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