Abstract
The development of basestock oil derived from renewable sources has become crucial as the world oil reserves are depleting. In this study, samples based on pequi oil (Caryocarbrasiliensis) were obtained by hydrolysis and esterification reactions, using a long-chain alcohol (2-ethylhexanol). Tribological tests in a four-ball configuration were performed to evaluate the lubricating behavior. A comparison of the Stribeck curve of the bio-based sample with that of a mineral hydrotreated basestock oil showed that the samples from pequi oil had a lower friction coefficient at all studied sliding speeds, ranging from 0 to 9.33 × 105 μm/s. The friction coefficient of the bio-based sample was 30.7% lower than that of a mineral hydrotreated basestock oil sample. The wear scar diameters were 0.371 mm for the bio-based samples and 0.195 mm for the mineral oil. This tribological performance indicates that a bio-based sample obtained from pequi oil may be potentially used as a lubricant basestock oil.
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Acknowledgements
Financial support from CNPq (Conselho Nacional de Pesquisa e Desenvolvimento Científico) is gratefully acknowledged. Ribeiro-Filho thanks the FAPEMA (Fundação de Amparo à Pesquisa e ao Desenvolvimento Científico e Tecnológico do Maranhão) and Universidade Estadual do Maranhão (UEMA) for financial support.
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The authors received financial support from CNPq (Conselho Nacional de Pesquisa e Desenvolvimento Científico). Ribeiro-Filho received personal financial support from Scientific and Technological Research and Development Support Foundation of Maranhão (FAPEMA) and Universidade Estadual do Maranhão (UEMA). The authors declare that they have no known competing financial interests or personal relationships that could have influenced the work reported in this paper. The data that support the findings of this study are available on request from the corresponding author. The data are not publicly available due to privacy or ethical restrictions. The authors have read and approved the final version of the manuscript. Paulo Roberto Campos Flexa Ribeiro Filho took the experimental measurements, carried out the data analysis and wrote the original draft; Matheus Rocha do Nascimento and Silvia Shelly Otaviano da Silva assisted in the experimental measurements; and Sandra de Aguiar Soares, Francisco Murilo Tavares de Luna and Célio Loureiro Cavalcante Jr. supervised the work and critically reviewed the results reported in this paper.
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Ribeiro Filho, P.R.C.F., da Silva, S.S.O., do Nascimento, M.R. et al. Tribological properties of bio-based lubricant basestock obtained from pequi oil (Caryocar brasiliensis). J Braz. Soc. Mech. Sci. Eng. 44, 51 (2022). https://doi.org/10.1007/s40430-021-03358-x
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DOI: https://doi.org/10.1007/s40430-021-03358-x