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Comparative study of the oxidative and thermal stability of vegetable oils to be used as lubricant bases

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Abstract

Demand for lubricating oils is increasing in the growing Brazilian economy. The use of vegetable bases in exchange of minerals can bring socio-economic and environmental benefits for Brazil. The purpose of this study is to compare the thermal and oxidative stability of vegetable oils related to the bases commonly used as lubricants. In this study, thermogravimetric analysis of castor oil, cotton oil, macauba’s almond oil, passion oil, paraffinic mineral oil, naphthenic oil (NH-140) and synthetic oil (Etro) was performed in inert and oxidative atmosphere to study the thermal and oxidative degradation of the vegetable oils related to the most common lubricants’ oils base. These oils’ oxidation stability were determined by standard procedures (ISO 6886). The use of mineral oil’s additives in these vegetable oils was tested to verify the viability of these additives to improve the oxidative stability of the vegetable oils. The castor oil and the cotton oil presented results of thermal analysis similar to the mineral and synthetic bases values. The castor oil was the only vegetable oil that showed a great oxidative stability. All other vegetable oils had their oxidative stability significantly increased by the additives.

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Acknowledgements

The authors are grateful to financial support from ANP, CNPq and IQ-UnB; and to the following companies Petrobras, Petronas, Cocal and Aboissa by collaboration with the oils used in this research.

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Authors and Affiliations

  1. Laboratório de Química Computacional (LQC), Instituto de Química, Universidade de Brasília, C.P. 4478, Brasília, DF, 70910-900, Brazil

    José Roberto dos Santos Politi & Paulo Roberto Rodrigues de Matos

  2. Centro de Pesquisas e Análises Tecnológicas (CPT) da Agência Nacional de Petróleo Gás Natural e Biocombustíveis (ANP), Brasília, DF, 70830-902, Brazil

    Paulo Roberto Rodrigues de Matos

  3. Laboratório de Pesquisa em Polímeros (LabPol), Instituto de Química, Universidade de Brasília, C.P. 4478, Brasília, DF, 70904-970, Brazil

    Maria José Araújo Sales

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  1. José Roberto dos Santos Politi
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  2. Paulo Roberto Rodrigues de Matos
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  3. Maria José Araújo Sales
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Correspondence to José Roberto dos Santos Politi.

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dos Santos Politi, J.R., de Matos, P.R.R. & Sales, M.J.A. Comparative study of the oxidative and thermal stability of vegetable oils to be used as lubricant bases. J Therm Anal Calorim 111, 1437–1442 (2013). https://doi.org/10.1007/s10973-012-2529-6

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  • DOI: https://doi.org/10.1007/s10973-012-2529-6

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