To read the full version of this content please select one of the options below:

In situ Raman spectroscopy study on the effect of antioxidants on high temperature oxidation properties of TMPTO

Bingxue Cheng (State Key Laboratory of Special Surface Protection Materials and Application Technology, Wuhan Research Institute of Materials Protection, Wuhan, China and State Key Laboratory of Tribology, Tsinghua University, Beijing, China)
Haitao Duan (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)
Lei Wei (State Key Laboratory of Special Surface Protection Materials and Application Technology, Wuhan Research Institute of Materials Protection, Wuhan, China)
Jia Dan (State Key Laboratory of Special Surface Protection Materials and Application Technology, Wuhan Research Institute of Materials Protection, Wuhan, China)
Song Chen (School of Mechanical Engineering, Hunan Institute of Science and Technology, Yueyang, China)
Jian Li (State Key Laboratory of Special Surface Protection Materials and Application Technology, Wuhan Research Institute of Materials Protection, Wuhan, China)

Industrial Lubrication and Tribology

ISSN: 0036-8792

Article publication date: 19 July 2019

Issue publication date: 22 August 2019

Abstract

Purpose

This paper aims to investigate the thermal oxidation characteristics of the unsaturated bonds (C=C) of trimethylolpropane trioleate (TMPTO) and to reveal the high temperature oxidation decay mechanism of unsaturated esters and the nature of the anti-oxidation properties of the additives.

Design/methodology/approach

Using a DXR laser microscopic Raman spectrometer and Linkam FTIR600 temperature control platform, the isothermal oxidation experiments of TMPTO with or without 1.0 wt. % of different antioxidants were performed.

Findings

The results indicated that the Raman peaks of =C-H, C=C and -CH2- weaken gradually with prolonged oxidation time, and the corresponding Raman intensities drop rapidly at higher temperatures. The aromatic amine antioxidant can decrease the attenuation of peak intensity, as it significantly reduces the rate constant of C=C thermal oxidation. The hindered phenolic antioxidant has a protective effect during the early stages of oxidation (induction period), but it may accelerate the oxidation of C=C afterwards.

Originality/value

Research on the structure changes of synthetic esters during oxidation by Raman spectroscopy will be of great importance in promoting the use of Raman spectroscopy to analyze the oxidation of lubricants.

Keywords

Acknowledgements

The authors are grateful the financial support from National Natural Science Foundation of China (No. 51575402).

Citation

Cheng, B., Duan, H., Jin, Y., Wei, L., Dan, J., Chen, S. and Li, J. (2019), "In situ Raman spectroscopy study on the effect of antioxidants on high temperature oxidation properties of TMPTO", Industrial Lubrication and Tribology, Vol. 71 No. 5, pp. 706-711. https://doi.org/10.1108/ILT-11-2018-0420

Publisher

:

Emerald Publishing Limited

Copyright © 2019, Emerald Publishing Limited