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<p>This study addressed the vulnerability of oils to oxidation during production and use by modifying 3,5-di-tert-butyl-4-hydroxybenzoic acid to develop a novel hindered phenolic antioxidant. The structures of the synthesized antioxidants were characterized using techniques such as <sup>1</sup>H NMR, <sup>13</sup>C NMR, and FTIR. Their thermal stability was evaluated via thermogravimetric analysis (TGA). Various concentrations (3000 to 7000&#xa0;ppm) of the synthesized antioxidants were incorporated into base oils. The oxidation resistance of the resulting mixtures was assessed using the rotary pressure vessel oxidation test (RPVOT). TGA results indicated that the modified antioxidants exhibited good thermal stability. It was observed that increasing the alkyl chain length enhanced oil compatibility, with longer chains yielding better results. Additionally, the RPVOT analysis confirmed that the modified antioxidants significantly improved the oxidation resistance of the base oil. Notably, the PN-modified antioxidant’s oxidative induction time increased from 50 to 419&#xa0;min at an additional level of 3000&#xa0;ppm. The synthesis method was straightforward, providing reliable experimental data and a theoretical framework for future research on these materials. </p>

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Preparation and performance of novel, highly efficient modified hindered phenolic antioxidants in lubricating oils

  • 期刊论文

  • 发表日期：

    2025年2月17日

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  • Deli Lu,
  • Yushi Lin,
  • Ying Liu,
  • Tao Guo,
  • Mariyiemu Abudukairimu,
  • Daomin Wang,
  • Zhaoxin Yin,
  • Jincan Yan,
  • Sheng Han

摘要

This study addressed the vulnerability of oils to oxidation during production and use by modifying 3,5-di-tert-butyl-4-hydroxybenzoic acid to develop a novel hindered phenolic antioxidant. The structures of the synthesized antioxidants were characterized using techniques such as 1H NMR, 13C NMR, and FTIR. Their thermal stability was evaluated via thermogravimetric analysis (TGA). Various concentrations (3000 to 7000 ppm) of the synthesized antioxidants were incorporated into base oils. The oxidation resistance of the resulting mixtures was assessed using the rotary pressure vessel oxidation test (RPVOT). TGA results indicated that the modified antioxidants exhibited good thermal stability. It was observed that increasing the alkyl chain length enhanced oil compatibility, with longer chains yielding better results. Additionally, the RPVOT analysis confirmed that the modified antioxidants significantly improved the oxidation resistance of the base oil. Notably, the PN-modified antioxidant’s oxidative induction time increased from 50 to 419 min at an additional level of 3000 ppm. The synthesis method was straightforward, providing reliable experimental data and a theoretical framework for future research on these materials.