Study Of Tribological Characteristics And Action Mechanism Of New Thiadiazole Derivatives And Triazine Derivatives

Lubricants are omnipresent and lubrication is a vital component of both domestic and industrial processes. From the viewpoint of environmental protection, it is imperative that the production, application and disposal of lubricants cover requirements of the best possible protection of our nature, environment and the living beings. Vegetable oils and synthetic diester are renewable resources, environmental friendly non-toxic fluids, which pose no work place health hazards and are readily biodegradable. However, it should be noticed that many traditional multifunctional lubricating additives responding well in conventional mineral oil base stocks do not have good compatibility with the vegetable oils and synthesis oils. Thus it is urgent to develop novel efficient additives for the formulation for advanced environment friendly lubricants.In this paper, the synthesis and the tribological of two new series of lubricant additives have been discussed. Two new triazine derivatives lubricant additives, TRLA and TREA, and two new thiadizole derivatives lubricant additives BATT and DATT were prepared in our laboratory. Their tribological behaviors as additives in raped seed oil and diester were evaluated using four-ball friction and wear testers as well. The two additives were investigated on thermal films and tribofilms by using X-ray absorption near edge structure (XANES) spectroscopy. And their action mechanism was discussed. Some valuable results were obtained as follows:1. All the additives synthesized by mannich reaction.2. In RSO and DE, all the synthesized thiadiazole derivatives: BATT and DATT possess excellent anti-wear and friction-reducing properties, and certain load-carrying property. The two additives all improve the PD and PB values of the base oil at different concentrations.3. The two triazine derivatives, TRLA and TREA show outstanding tribological performance in DE and RSO. The friction coefficient and the wear scar can be greatly decreased by the two synthesized compounds at different concentrations. The PD and PB values of the two additives are both higher than that of the base oil.4. According to the XANES results, the thermal films generated from the four additives are all composed mainly by FeS. The analysis result of tribofilms generated from two series additives indicates that active S reacts with the renascent iron to form a continuous and effective protective film. Under EP-1 (the maximum non-seizure load ) and EP-2 (nearly weld load)conditions, the tribochemical films from two series additives in RSO and DE mainly consist of FeS and FeSO₄.