Synthesis and performance evaluation of O, O-dialkylphosphorodithioic disulphides as potential antiwear, extreme-pressure and antioxidant additives

• Published in: Tribology international Vol. 26; no. 6; pp. 389 - 394
• Main Authors: Sarin, R., Gupta, A.K., Tuli, D.K., Verma, A.S., Rai, M.M., Bhatnagar, A.K.
• Format: Journal Article
• Language: English
• Published: Oxford Elsevier Ltd 01.12.1993; Elsevier
• Subjects: antioxidant; antiwear; Applied sciences; dialkylphosphorodithioic disulphides; Exact sciences and technology; extreme pressure; Friction, wear, lubrication; lubricating additive; Machine components; Mechanical engineering. Machine design; lubricating additive; antiwear; antioxidant; extreme pressure; dialkylphosphorodithioic disulphides; Performance evaluation; Organic disulfide; Antiwear additive; Alkyl; EP additive; Anticorrosion additive; Organic dithiophosphate; Tribology
• ISSN: 0301-679X; 1879-2464
• DOI: 10.1016/0301-679X(93)90077-E

The ashless antiwear/EP additives based on phosphorodithioic acids are preferred to their heavy metal complexes, due to operational problems and enviromental restrictions being enforced in many countries. Four O, O-dialkylphosphorodithioic disulphides with varying alkyl chain length from C5 to C10 have been synthesized and their antiwear, EP and antioxidant performance examined vis-à-vis a commercial ZDDP in a mineral base oil. The synthesized products have been found to exhibit appreciable antiwear and antioxidant properties and mild EP performance, which are comparable to that of commercial ZDDP.