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Lubrication properties of modified lard and rapeseed oil greases with sodium and lithium thickeners

Juozas Padgurskas (Institute of Power and Transport Machinery Engineering, Aleksandras Stulginskis University, Kauno r., Lithuania)
Raimundas Rukuiža (Institute of Power and Transport Machinery Engineering, Aleksandras Stulginskis University, Kauno r., Lithuania)
Arturas Kupcinskas (Institute of Power and Transport Machinery Engineering, Aleksandras Stulginskis University, Kauno r., Lithuania)
Raimondas Kreivaitis (Institute of Power and Transport Machinery Engineering, Aleksandras Stulginskis University, Kauno r., Lithuania)

Industrial Lubrication and Tribology

ISSN: 0036-8792

Article publication date: 14 September 2015

201

Abstract

Purpose

The purpose of this paper is to conduct research on the possibility of improving the tribological and utilization properties of lard and rapeseed oil bio-based greases by mixing it with ethanol and selection of thickener and modification with special biological additives.

Design/methodology/approach

Rapeseed oil- and lard-based greases with sodium and lithium soap thickeners were mixed with either water or ethanol and modified with a special biological anti-wear additive. Tribological properties of modified lubricants evaluated on a four-ball machine.

Findings

Rapeseed oil- and lard-based greases suspended in ethanol and modified with bio-additive have the same wear resistance as the industrial non-biological lubrication grease and much higher wear resistance as bio-based reference grease. The tribological efficiency of the additives is higher in greases of rapeseed oil and less efficient in lard-based greases. Oxidation and wear tests show that investigated bio-based greases have comparatively stable tribological properties also after their aging. Modified greases have sufficient consistence according penetration measurements and high thermal resistance according drop-point temperature measurements. All produced experimental greases pass within the category of the easily degradable materials.

Originality/value

The greases mixed with the ethanol make possible to form more homogeneous and stable grease mixture. Modified bio-based greases have significantly higher wear resistance as bio-based reference grease, their lubrication properties are stable also after the aging and are categorized as easily degradable materials.

Keywords

Acknowledgements

This research was supported by EU FP7 IRSES project Oil & Sugar (FP7-PEOPLE-2011-IRSES-295202) grant.

Citation

Padgurskas, J., Rukuiža, R., Kupcinskas, A. and Kreivaitis, R. (2015), "Lubrication properties of modified lard and rapeseed oil greases with sodium and lithium thickeners", Industrial Lubrication and Tribology, Vol. 67 No. 6, pp. 557-563. https://doi.org/10.1108/ILT-12-2014-0140

Publisher

:

Emerald Group Publishing Limited

Copyright © 2015, Emerald Group Publishing Limited

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