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Antioxidant synergism between synthesised alkylated diphenylamine and dilauryl thiodipropionate in polyolefin base fluid

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Abstract

An oil-soluble additive alkylated diphenylamine (ADPA) was synthesized. The antioxidant activities of ADPA and dilauryl thiodipropionate (DLTDP) as well as their mixtures in PAO10 were evaluated by rotary bomb oxidation test, pressurized differential scanning calorimetry, hot oil oxidation test, and thermogravimetry. All the tests showed that the anti-oxidation stability of ADPA was significantly improved with the addition of DLTDP. The kinetic parameters of thermal-oxidative process were also evaluated using the Kissinger method which has been widely used for the determination of activation energy and pre-exponential factor. The results indicated that ADPA could significantly improve the activation energy of PAO10 and reduce the rate of the thermal-oxidative reaction when combining with DLTDP antioxidant. All these results demonstrated that the combination of ADPA and DLTDP revealed a good synergistic effect and could effectively enhance the thermal-oxidation stability of PAO10. The proposed mechanism of the inhibition involved a synergy between ADPA and DLTDP.

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Acknowledgements

This work was supported by the Major State Basic Research Development Program of China (973 Program) (Grant No. 2013CB632301).

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Authors and Affiliations

  1. State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou, 730000, People’s Republic of China

    Mianran Chao, Weimin Li & Xiaobo Wang

  2. University of Chinese Academy of Sciences, Beijing, 100049, People’s Republic of China

    Mianran Chao

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  1. Mianran Chao
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  2. Weimin Li
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  3. Xiaobo Wang
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Correspondence to Xiaobo Wang.

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Chao, M., Li, W. & Wang, X. Antioxidant synergism between synthesised alkylated diphenylamine and dilauryl thiodipropionate in polyolefin base fluid. J Therm Anal Calorim 117, 925–933 (2014). https://doi.org/10.1007/s10973-014-3808-1

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  • DOI: https://doi.org/10.1007/s10973-014-3808-1

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