A study of the synergistic effect of a triazine-dithiocarbamate derivative with tcp in vegetable oil

Abstract

A novel, potential ashless S—N-style additive, 2-(N,N-dibutylamino)-4,6-bis-(dibutyldithiocarbamate)-1,3,5-triazine (DBTT), was synthesised and its synergistic tribological effect with a traditional additive, tricresyl phosphate (TCP), in rape seed oil was evaluated using a four-ball tester. The results show that the load-carrying capacity of the vegetable oil could be improved greatly by the presence of the TCP and/or DBTT additives; at certain mass ratios TCP and DBTT show a good synergistic effect in improving the tribological performance of the base oil. The elemental composition and chemical nature of antiwear films generated at a steel interface were investigated using Kevex energy dispersive X-ray analysis and X-ray photoelectron spectroscopy. Scanning electron microscopy was also used to study the rubbed surface morphology. It was found that FeS, organosulphur compound, sulphate, phosphate, and nitrogen-containing compounds were present in the complex boundary lubrication film.