Issue 60, 2019

Multifunctional lubricant additive based on difluoroboron derivatives of a diphenylamine antioxidant

Abstract

A metal-free and phosphorus-free novel multifunctional additive (E)-4-((3-(tert-butyl)-2-((difluoroboranyl)oxy)-5-((octylthio)methyl)benzylidene)amino)-N-phenylaniline (difluoroboron derivative 4a) was synthesized and characterized. The results show that its antioxidation and tribological properties are better than those of base oil, diphenylamine and zinc dialkyldithiophosphate (ZDDP), and it can also increase the extreme pressure performance of the base oil. In addition, it can be found that the diphenylamine functional group, boron and fluorine are the main contributors to the excellent antioxidation and antiwear properties of difluoroboron derivative 4a, respectively. Finally, the results of X-ray photoelectron spectroscopy on the worn surfaces reveal that B2O3, Fe2O3, a N-containing organic compound and iron fluoride comprise the boundary films, which effectively improve the difluoroboron derivative 4a's antiwear properties.

Graphical abstract: Multifunctional lubricant additive based on difluoroboron derivatives of a diphenylamine antioxidant

Supplementary files

Article information

Article type
Paper
Submitted
17 Jul 2019
Accepted
16 Oct 2019
First published
30 Oct 2019
This article is Open Access
Creative Commons BY-NC license

RSC Adv., 2019,9, 35059-35067

Multifunctional lubricant additive based on difluoroboron derivatives of a diphenylamine antioxidant

S. Wang, S. Yu, J. Feng and S. Liu, RSC Adv., 2019, 9, 35059 DOI: 10.1039/C9RA05490A

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