Abstract
Three oil–miscible phosphonium ionic liquids with different structures were synthesized and used as additives for a Poly Alpha Olefin 10 (PAO 10) lithium lubricating grease. Different from other additives, the ionic liquids participated in saponification and were trapped in the entanglement network formed by the thickener. The effects of the ionic liquids on the rheological properties of lithium lubricating grease were characterized through a small-amplitude oscillatory shear (SAOS) measurement. The tribological performances of the lubricating greases were determined on a four-ball friction tester. The addition of phosphonium ionic liquids caused a decrease in the storage (G′) and loss (Gʺ) modulus of lubricating grease. However, the ionic liquids were found to be effective lubricant additives for improving the friction-reducing and antiwear properties of PAO 10 lithium lubricating grease.
Highlights
Lubricating grease, consisting of a thickener dispersed in mineral or synthetic oil, is usually used in gears, bearings, and other mechanical moving parts [1], where it acts as a lubricant and sealing agent
The ionic liquids (ILs) were added into PAO10 with the mass ratio of 5 wt % and fully stirred until the ILs were completely dissolved in Poly Alpha Olefin 10 (PAO 10)
The G0 and G00 of PAO10 grease is higher than those of the [P88814 ][DEHP] and [P88814 ][AOT] greases but similar to the [P888p ][DEHP] grease. These results indicated that the addition of [P88814 ][DEHP] and
Summary
Lubricating grease, consisting of a thickener dispersed in mineral or synthetic oil, is usually used in gears, bearings, and other mechanical moving parts [1], where it acts as a lubricant and sealing agent. Several papers have been published on the use of different types of ILs as lubricants, lubricant additives, or base oils to prepare lubricating grease [6,7,8,9,10,11]. The prepared ionic liquids showed remarkable tribological performance as a base oil or an additive [14]. Our group considered mixing a certain amount of oil-miscible IL in base oil and using the oil–IL blends to prepare lubricating grease. In this process, the oil–miscible ILs were not physically mixed with the grease but participated in saponification. The tribological performances of the lubricating greases were determined in the form of friction coefficient and wear volume on a four-ball friction tester
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