Study of a novel anti‐wear additive used in ashless anti‐wear hydraulic fluid

Abstract

Purpose

The purpose of this paper is to develop novel ashless additives and to meet the need for formulating ashless anti‐wear (AW) hydraulic fluid or other industrial lubricating oils. This paper also aims to investigate the tribological behaviours and mechanism of an acrylate of dialkyl dithiophosphoric acid (ADDP), as an additive in some group I/II base oils compared with some traditional s‐p containing AW additives.

Design/methodology/approach

ADDP is synthesized in the laboratory. The chemical composition and structure of the lubricating additive are analyzed by means of infrared spectroscopy. Its extreme pressure (EP), AW and friction reduction properties as additive in base oils, compared with some traditional s‐p containing AW additives, are investigated using a four‐ball machine according to relative testing standards. The tribological mechanism is discussed according to the scanning electron microscope (SEM) analytical data.

Findings

The results indicate that the four‐ball PB value of the prepared ADDP in HVIWH650 is better than that of the IRGLUBE 353; the thermal stability of ADDP is equivalent to the zinc dialkyl dithiophosphate (ZDDP) and the SEM data show that the prepared ADDP additive could form a layer of uniform film on the worn surface serving as lubricant and protective film. This may be the chief reason why the prepared ADDP possesses better AW property than ZDDP.

Research limitations/implications

However, more experimental studies such as the synergic effect with other additives should be performed, from which it could be learned whether the novel AW additive would be applicable in industrial oils.

Practical implications

The results may be useful for the researchers to formulate some ashless industrial oils.

Originality/value

A novel additive was synthesized in the laboratory; it would find a promising industrial application as an ashless AW additive.

Citation

Longhua, Z. (2009), "Study of a novel anti‐wear additive used in ashless anti‐wear hydraulic fluid", Industrial Lubrication and Tribology, Vol. 61 No. 5, pp. 271-276. https://doi.org/10.1108/00368790910976104