Synthesis, Characterization And Tribological Properties Of Benzotriazole And Xanthogenate Derivatives

The anti-wear and extreme pressure lubricating oil additives have always been important in the research of lubricants. With the development of modern industry and an increasing notice put on environment protection, there are new requests on the development of lubricating oil additives such as studying highly efficient and multifunctional lubricating oil additives and ensuring no phosphor or zinc contained in additives. Large amounts of former research papers have proved that element nitrogen is helpful not only to form a protective film owning anti-wear and friction reduction properties during the sliding process, but also alleviate the erosion caused by other active elements such as sulfur. Among many kinds of nitrogen and sulfur contained compounds, the N containing heterocyclic compounds are noticed due to their characteristics of compact structures, good thermal stability, being useful to synthesize new compounds combining different active elements and less harmful to environment.In this paper sixteen compounds as lubricating additives were synthesized and twelve of them were novel, their preparative conditions were investigated. Moreover molecular structures of the compounds were confirmed by 1H NMR, 13C NMR, MS and elementary analysis. It Studies them in various dissolution, All the derivatives start to thermally decompose above 125℃,and it does hot stability carry on the evaluation. The tribological behavior of the synthetic compounds as additives in liquid paraffin were evaluated with a four-ball machine, the results show that the compounds as additives in liquid paraffin increase the load-carrying capacity and improve the anti-wear ability. According to the analysis of their molecular structures, it can be considered that during the sliding process, nitrogen atom has conjugated with the empty d atomic orbit of the metal through its lone pair electrons. With S element contained in the compounds, the influence on the load carrying capacity of the base oil was enhanced, may be due to the formation of S2-,S- and SO42- compounds on the worn surface that a protective film was formed.