Synthesis and evaluation of amines/phenolics antioxidant for TMPTO base oil

Wen Zhan (State Key Laboratory of Special Surface Protection Materials and Application Technology, Wuhan Research Institute of Materials Protection, Wuhan, China)
Dan Jia (State Key Laboratory of Special Surface Protection Materials and Application Technology, Wuhan Research Institute of Materials Protection, Wuhan, China)
YongLiang Jin (State Key Laboratory of Special Surface Protection Materials and Application Technology, Wuhan Research Institute of Materials Protection, Wuhan, China)
HaiTao Duan (State Key Laboratory of Special Surface Protection Materials and Application Technology, Wuhan Research Institute of Materials Protection, Wuhan, China)
Jian Li (State Key Laboratory of Special Surface Protection Materials and Application Technology, Wuhan Research Institute of Materials Protection, Wuhan, China)
Jun Liu (South China Branch, Sinopec Sales CO.LD, Guangzhou, China)

Industrial Lubrication and Tribology

ISSN: 0036-8792

Publication date: 12 August 2019

Abstract

Purpose

The purpose of this paper is to synthesize amines/phenolic antioxidants by a new method and to characterize the influence of antioxidants on thermo-oxidative degradation in trimethylolpropane trioleate (TMPTO) base oil.

Design/methodology/approach

The molecule structures of antioxidants and lubricants were confirmed using Fourier transform infrared spectroscopy (FTIR). The oxidative stability of antioxidants and lubricants was evaluated by pressurized differential scanning calorimetry (PDSC).

Findings

These findings suggested that butyl-octyl-diphenylamine has obvious advantage on kinematic viscosity inhibition, and amine-phenol combination antioxidant has a slightly better suppression of total acid in TMPTO under thermal oxidation at 200°C for 96 h. The FTIR characterizations showed that all antioxidants could protect the basic structure of TMPTO in the early stage of thermal degradation.

Originality/value

Under the action of butyl-octyl-diphenylamine, the dehydrogenation of TMPTO is easily met with the alkenyl hydrogen = C–H bond in the unsaturated C = C. Meanwhile, as octadecyl 3-(3, 5-di-tert-butyl-4-hydroxyphenyl)propionate protects TMPTO, the unsaturated C = C bond in the base oil molecule easily breaks down during transition.

Keywords

Citation

Zhan, W., Jia, D., Jin, Y., Duan, H., Li, J. and Liu, J. (2019), "Synthesis and evaluation of amines/phenolics antioxidant for TMPTO base oil", Industrial Lubrication and Tribology, Vol. 72 No. 1, pp. 46-53. https://doi.org/10.1108/ILT-02-2019-0053

Publisher

:

Emerald Publishing Limited

Copyright © 2019, Emerald Publishing Limited

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