Study On Tribological Properties Of Aqueous Solution With Propylene Glycol Polyether And Triethanolamine Oleoyl

With the drying up of global oil resources and environment pollution, in the oil field, the green water-based lubricants gain more and more attention. Although water-based lubricant meets the requirement of sustainable development, it has low bearing capacity and it’s easy to corrode, make it an urgent necessary to select excellent additives to improve the lubrication performance. This paper selects the propylene glycol polyether (PPE) and triethanolamine oleoyl (TO) as water-based lubricant additives, and they are configured in different concentration and conducted series of tribology performance test and analysis research.Firstly, the anti-friction and anti-wear properties of the two kinds of lubricants are analyzed by four-ball friction and wear testing machine in three aspects:concentration, load and speed for analyzing the influences on friction coefficient and grinding spot diameter. The friction pair surface morphology is conducted by3d surface topography apparatus. Experimental data shows that the PPE’s friction coefficient is0.06at10%concentration and grinding spot diameter is0.452mm, all above showed that the addition of the PPE greatly increases the anti-friction and anti-wear performance. TO’s inclusion increases the extreme pressure performance significantly, PB value reaches932N, about24%higher than that of the PPE. At the same time, it also further improves the PPE-TO’s anti-friction and anti-wear performance.Then the rheological properties of both two kinds of water-based lubricants are analyzed. Test data show that the PPE and the PPE-TO have good characteristics of Newtonian at low concentration and low temperature, while high temperature and high concentration lead to the phenomenon of shear thinning, which show the non-Newtonian characteristics. The cloud point affects viscosity, while the cloud point is affected by the additive, the joining of TO reduce the viscosity of lubricant.Finally, the film performances of both two kinds of lubricant are investigated. Experimental data show that the film thickness is about10nm at1%concentration; both lubricants have good film forming ability with relatively low concentrations, the greater the concentration is, the better film-forming performance will be. The film thickness decreases with the increase of load, with the film thickness between20nm and30nm, whose lubrication is mainly in the form of boundary lubrication and thin film lubrication.The friction performance test shows that the joining of PPE and TO significantly improves lubrication performance. In addition, PPE and TO have good anti-friction and anti-wear effect and green environmental protection, so they have good application value.