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Research Article | Open Access

Rheological and tribological approaches as a tool for the development of sustainable lubricating greases based on nano-montmorillonite and castor oil

José Enrique MARTÍN-ALFONSO1( ), María José MARTÍN-ALFONSO1, Concepción VALENCIA1, María Teresa CUBERES2
Department of Chemical Engineering and Materials Science, Campus de "El Carmen", University of Huelva, Chemical Product and Process Technology Research Center (Pro2TecS), Huelva 21071, Spain
Department of Applied Mechanics and Project Engineering, University of Castilla-La Mancha, Almadén 13400, Spain
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Abstract

This study investigates the development of novel montmorillonite/castor oil blends to formulate sustainable lubricating greases to promote the replacement of petrochemicals industry-derived materials by substances obtained from renewable sources. Specifically, the effect of the thickener concentration on the rheological, chemical, thermal, tribological properties, and atomic force microscopy (AFM) microstructure of these systems were studied. The results showed that the C20A nanoclay content could be used to modulate the viscosity values, the linear viscoelastic functions, and tribological properties of these montmorillonite dispersions. In general, these gel-like dispersions exhibited remarkable lubricant properties; the samples showed values of the friction coefficient and wear scars similar or lower than those obtained with model bentonite grease.

Keywords

lubricating greasesnanoclayvegetable oilrheologytribology

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Friction
Volume 9 Issue 2,
April 2021
Pages 415-428
DOI: 10.1007/s40544-020-0407-y
Cite this article:
MARTÍN-ALFONSO JE, MARTÍN-ALFONSO MJ, VALENCIA C, et al. Rheological and tribological approaches as a tool for the development of sustainable lubricating greases based on nano-montmorillonite and castor oil. Friction, 2021, 9(2): 415-428. https://doi.org/10.1007/s40544-020-0407-y

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Received: 11 April 2020
Revised: 14 May 2020
Accepted: 21 May 2020
Published: 31 October 2020
© The author(s) 2020

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