Highly effective ashless and non-corrosive dimercaptobenzothiadiazole as multifunctional lubricant additives in naphthenic base oil.

Autor: Ong CL; Nanotechnology and Catalysis Research Centre, Level 3, Block A, Institute for Advanced Studies, University of Malaya 50603 Kuala Lumpur Malaysia jcjuan@um.edu.my., Lai YC; Oleon Port Klang Sdn. Bhd. 57, Jln Sungai Pinang 4/3, Taman Perindustrian Pulau Indah 42920 Pelabuhan Klang Selangor Malaysia., Heidelberg T; Department of Chemistry, Faculty of Science, University of Malaya 50603 Kuala Lumpur Malaysia., Tang WK; Department of Chemistry, Faculty of Science, University of Malaya 50603 Kuala Lumpur Malaysia., Lee VS; Department of Chemistry, Centre of Theoretical and Computational Physics (CTCP), Faculty of Science, University of Malaya 50603 Kuala Lumpur Malaysia., Khaligh NG; Nanotechnology and Catalysis Research Centre, Level 3, Block A, Institute for Advanced Studies, University of Malaya 50603 Kuala Lumpur Malaysia jcjuan@um.edu.my., Juan JC; Nanotechnology and Catalysis Research Centre, Level 3, Block A, Institute for Advanced Studies, University of Malaya 50603 Kuala Lumpur Malaysia jcjuan@um.edu.my.; Faculty of Engineering, Technology and Built Environment, UCSI University Cheras 56000 Kuala Lumpur Malaysia.
Jazyk: angličtina
Zdroj: RSC advances [RSC Adv] 2023 Oct 19; Vol. 13 (44), pp. 30733-30742. Date of Electronic Publication: 2023 Oct 19 (Print Publication: 2023).
DOI: 10.1039/d3ra05692a
Abstrakt: The conventional medium chain chlorinated paraffin (MCCP) and zinc dialkyl dithiophosphate (ZDDP) additives have greatly enhanced the extreme pressure (EP) and anti-wear (AW) performance of the metalworking fluids. However, chlorine- and zinc-containing additives are restricted in use due to eco-toxicity issue. Herein, ashless and non-corrosive dimercaptobenzothiadiazole derivatives, namely bis-2,5-benzylsulfanyl-[1,3,4]thiadiazole (BBST) and bis-2,5-octylsulfanyl-[1,3,4]thiadiazole (BOST) consist of three sulfur atoms have been synthesized and evaluated. The performance of BBST shows a weld load ( P D ) of 3089 N and AW value of 5 mm 2 , which represents an improvement of 3.1 and 7.4 folds over naphthenic base oil (NBO). In addition, BBST also outperformed BOST, MCCP, and ZDDP in terms of its weld load and AW properties. Based on XPS analysis and molecular electrostatic potential maps (MEPS), BBST exhibits superior tribology performance due to the interaction between the sulfur (S), nitrogen (N), and π-electrons of the benzene ring with the metal surface. The formation of FeS, Fe 2 O 3 and Fe⋯N coordinate bonds contributes to the creation of an excellent tribofilm.
Competing Interests: There are no conflicts to declare.
(This journal is © The Royal Society of Chemistry.)
Databáze: MEDLINE
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