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<p>Lubricants play a crucial role in reducing friction and wear between machine parts and transmission systems. Increasing environmental and economic concerns have driven a preference for lubricants derived from renewable oil sources, known as biolubricants, valued for their biodegradability and reduced toxicity. Nevertheless, biolubricants may exhibit low thermo and oxidative stabilities: as such, to enhance the properties of biolubricants, additives are essential. In this context, the thermo and oxidative stabilities of the biolubricants samples (2-ethylhexyl oleate, 2EH) were evaluated by adding a phosphorylated bioadditive derived from cashew nutshell liquid (P-CDN) or a commercial phosphorylated additive (TCP: tricresyl phosphate). The antioxidant potential of P-CDN was compared to a TCP using the Rancimat method. The results indicated that the synthesized bioadditive increased the oxidative stability time (OST) of 2EH more than four times, from 4.25 to 18.30&#xa0;h, outperforming the commercial phosphate additive, which only increased OST from 4.25 to 4.75&#xa0;h. Additionally, there was an increase in the initial degradation temperature (T<sub>onset</sub>) of 2EH, from 226&#xa0;°C to 250&#xa0;°C with the addition of 1 wt% of P-CDN. The results indicate that P-CDN significantly enhanced the thermal and oxidative stability of the bio-based lubricant, highlighting the potential of the cardanol-based additive due to both its effectiveness and sustainable origin.</p>

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Cardanol-Based Additive as Antioxidant for Biolubricants

  • 期刊论文

  • 发表日期：

    2025年7月16日

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  • Daniele B. Freitas,
  • M. Marliete F. Melo Neta,
  • Rodolpho R. C. Monteiro,
  • Joyce E. A. S. Figueredo,
  • Diego Lomonaco,
  • Célio L. Cavalcante Jr.,
  • F. Murilo T. Luna

摘要

Lubricants play a crucial role in reducing friction and wear between machine parts and transmission systems. Increasing environmental and economic concerns have driven a preference for lubricants derived from renewable oil sources, known as biolubricants, valued for their biodegradability and reduced toxicity. Nevertheless, biolubricants may exhibit low thermo and oxidative stabilities: as such, to enhance the properties of biolubricants, additives are essential. In this context, the thermo and oxidative stabilities of the biolubricants samples (2-ethylhexyl oleate, 2EH) were evaluated by adding a phosphorylated bioadditive derived from cashew nutshell liquid (P-CDN) or a commercial phosphorylated additive (TCP: tricresyl phosphate). The antioxidant potential of P-CDN was compared to a TCP using the Rancimat method. The results indicated that the synthesized bioadditive increased the oxidative stability time (OST) of 2EH more than four times, from 4.25 to 18.30 h, outperforming the commercial phosphate additive, which only increased OST from 4.25 to 4.75 h. Additionally, there was an increase in the initial degradation temperature (Tonset) of 2EH, from 226 °C to 250 °C with the addition of 1 wt% of P-CDN. The results indicate that P-CDN significantly enhanced the thermal and oxidative stability of the bio-based lubricant, highlighting the potential of the cardanol-based additive due to both its effectiveness and sustainable origin.