Investigation of antiwear additives for diester

Abstract

Purpose

The purpose of this paper is to study tribological properties of two novel additives in the diester and provide adequate information on the relationship between the diester and the additives.

Design/methodology/approach

The two 2‐mercaptobenzothiazole derivatives, referred to as BZIA, BZOA, are synthesized with one pot; their tribological performances are evaluated using a four‐ball friction and wear tester, and the worn surface was analysed with scanning electron microscope and X‐ray photoelectron spectroscopy (XPS).

Findings

The two compounds as the additives in the diester possess excellent load‐carrying capacities, rather good anti‐wear (AW) and friction reduction properties. According to the XPS results, both the additives reacted with counter‐face metal and generated a sulphur‐containing inorganic film and a complex adsorption film. The inorganic film obtained with the additive BZOA consisted of FeS₂, FeSO₄ and Fe₂(SO₄)₃, whereas the inorganic film obtained with the additive BZIA consisted of FeS₂ or FeS. The adsorption layer for the two additives contained N‐containing compounds.

Research limitations/implications

The interaction of the two additives with the diester needs to be further explored.

Practical implications

Two useful, environmentally friendly, AW lubricating oil additives are synthesized with one pot.

Originality/value

The paper provides a study of some N, S‐containing heterocyclic compounds as environmentally friendly lubricating oil additives.

Citation

Wu, H. and Ren, T. (2009), "Investigation of antiwear additives for diester", Industrial Lubrication and Tribology, Vol. 61 No. 5, pp. 240-245. https://doi.org/10.1108/00368790910976069