The Synthesis Of Disulfide-Type Triazine Derivatives And Studies Of Their Tribological Characteristic And Mechanism

With the shortage of resources and environment pollution, the maintask of modern tribology is not only to decrease friction and wear, but also toprotect the environment and increase the quality of people’s life. Most ofthe traditional lubricant cannot accord with the demands of mechanicallubrication and the standard of environment protection. So, how toimprove the environment efficiency while satisfying the demands of theuse of lubrication is a very important task to be studied and solved. In thispaper, two kinds of ashless non-phosphorous disulfide-type triazinederivatives were synthesized from the cheap raw material, cyanuricchloride.Their tribological performances in biodegradable lithium grease andthe tribological performances of DTOT used as simple and complexes（with ZDDP or T306） in biodegradable rapeseed oil were systematicallyevaluated by using a four-ball machine. The morphology of wear scar,chemical composition of tribofilm and the lubrication mechanism of thesetriazine derivatives are studied by the combination of SEM and XPS surfaceanalysis technologies. The main content and conclusions are drawn asbelow:1. Disulfide-type triazine derivatives have been synthesized. 2. The synthesized TRIAZINE DERIVATIVES possess excellentlubrication property. They can largely improve the extreme pressure andantiwear properties of base lithium grease, and the longer alkyl chainderivative DTOT is better than the shorter alkyl chain derivative DTBT.The derivative DTOT can obviously improve the extreme pressure andantiwear properties of rapeseed oil if the added content is relatively high.And when the derivative DTOT is blended with ZDDP or T306, thecomplexes possess better tribological performance than the single additivein appropriate blending concentration, and in this condition, synergisticeffect generates.3. The analysis results of tribofilm indicate that during the rubbingprocess, the nitrogen element in the triazine derivative adsorbs on the metalsurface as organic nitrogen compounds, the sulfur element exists as sulfide（FeS, FeS₂）, sulfate （FeSO₄, Fe₂（SO₄）₃） and organic sulfur compounds, andthere also exists iron oxide（Fe₃O₄, Fe₂O₃, FeO）in the tribofilm. WhenDTOT is blended with ZDDP, ZnS and phosphate（or pyrophosphate） wereformed in the film; and phosphate（or pyrophosphate） were also formedwhen the derivative DTOT is blended with T306.