Abstract
A new method of improving the hydrolytic stability of borate esters is proposed based on ‘stable benzylic cation’ theory. In accordance with this strategy, phenyl-borated hydroxyalkyldithiocarbamate as a multi-functional additive is designed and synthesized. Its tribological properties are evaluated using four-ball friction and wear tester. Results show the additive possesses outstanding load-carrying and friction-reducing properties, compared with MoDTC, and can improve anti-wear properties of rapeseed oil (RSO) dramatically. Moreover, it is surprisingly found that PBDTC has prominent effect in controlling the oxidation of RSO. The worn surface of the steel ball is investigated by X-ray photoelectron spectroscopy and the anti-wear mechanism of the additive is preliminarily discussed.
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