Antioxidant behavior and tribological performance of a novel multifunctional additive in complex lithium grease

Abstract

Purpose

This paper aims to contrastively investigate the antioxidant behavior and tribological performance of a novel multifunctional additive (PBT) and dialkyldithiophosphate (ZDDP) in complex lithium grease (CLG).

Design/methodology/approach

PBT was successfully synthesized through esterification reaction. The antioxidant behavior of PBT and ZDDP was investigated by thermal analysis, and meanwhile, their tribological performance was evaluated by Optimol SRV-IV oscillating reciprocating friction and wear tester (SRV-IV test) and MRS-1J four-ball tester (Four-ball test). Furthermore, their anticorrosion ability was determined by copper strip corrosion test.

Findings

Four-ball tests showed that the extreme pressure property of PBT was a little inferior to that of ZDDP. Besides, all the other results demonstrated that PBT showed more superior antioxidation stability, friction-reduction and antiwear ability, as well as anticorrosion performance than ZDDP.

Originality/value

This work provides a study of hindered phenol derivative as a multifunctional additive in lubricant grease, which can contribute to the development of substitution of ZDDP.

Citation

Chao, M., Jin, M., Gong, P., Shen, D. and Zhu, L. (2021), "Antioxidant behavior and tribological performance of a novel multifunctional additive in complex lithium grease", Industrial Lubrication and Tribology, Vol. 73 No. 8, pp. 1122-1128. https://doi.org/10.1108/ILT-10-2020-0380