Synthesis and study of tribological properties of ionic liquids as an ash-free additive package in hydraulic oils

Subject Areas :

Shahriar Keshavarzi ¹ , mohammadreza naeimi jamal ² , mohamad.G Dekamin ³

1 - PhD student in Department of Chemistry, Department of Chemistry, Iran University of Science and Technology, Tehran, Iran.
2 - Professor of Organic Chemistry, Department of Chemistry, Iran University of Science and Technology, Tehran, Iran.
3 - Professor of Organic Chemistry, Department of Chemistry, Iran University of Science and Technology, Tehran, Iran

Received: 2021-02-05 Accepted : 2021-02-05 Published : 2021-02-19

Keywords: Ionic liquids, tribological properties, Hydraulic oil, Anti-rust additive, Anti-wear additive,

Abstract :

Because of ever-increasing demand for the use of biodegradable lubricants and additives, it is necessary to design and synthesize new additives. In the present study, two ionic liquids with imidazole cations were synthesized and characterized by 1H NMR and FTIR spectra. The use of ionic liquids based on the imidazolium cation and anion bis(trifluoromethylsulfonyl)amide (TFSA) and tris­(tetrafluoroethyl)trifluorophosphate (FAP) has been investigated. These additives are known to be green additives as these compounds lack zinc, an element prohibited by environmental protection organizations. These materials were used as an additive to ISO 32 grade hydraulic oil. Their lubricating properties, such as cinematic viscosity at 40°C, copper corrosion, 4-ball weld point test, sulfated ash, oil/water separating test, and air release from oil were examined, which showed better results than the ordinary additive zinc dialkyldithiophosphate (ZDDP).

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