Lubricants (Jan 2023)

Synthesis and Frictional Characteristics of Bio-Based Lubricants Obtained from Fatty Acids of Castor Oil

  • Paulo Roberto Campos Flexa Ribeiro Filho,
  • Matheus Rocha do Nascimento,
  • Silvia Shelly Otaviano da Silva,
  • Francisco Murilo Tavares de Luna,
  • Enrique Rodríguez-Castellón,
  • Célio Loureiro Cavalcante

DOI
https://doi.org/10.3390/lubricants11020057
Journal volume & issue
Vol. 11, no. 2
p. 57

Abstract

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The depletion of oil reserves and concerns about the environmental impact of the use and incorrect disposal of mineral lubricants have been promoting the development of bio-based lubricants. In this study, biolubricants obtained from fatty acids of castor oil were synthesized by esterification (>wt.%93), epoxidation (>wt.%92), and oxirane ring opening reactions using water (>wt.%92) or 2-ethylhexanol (>wt.%94) as nucleophilic agents. The frictional characteristics of the synthesized samples were obtained through tribological tests performed in a four-ball tester and compared with a commercial mineral oil. The sample obtained through oxirane ring opening with water showed the best frictional performance (FC = 0.0699 ± 0.0007) among the prepared samples, with equivalent wear rate (WSD = 281.2 ± 5.54 μm) and ca. 20% lower friction coefficient when compared to the commercial mineral oil, indicating its great potential for replacing mineral fossil oils.

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