Please use this identifier to cite or link to this item:https://hdl.handle.net/20.500.12259/88771
Type of publication: Straipsnis Clarivate Analytics Web of Science ar/ir Scopus / Article in Clarivate Analytics Web of Science or / and Scopus (S1)
Field of Science: Mechanikos inžinerija / Mechanical Engineering (T009)
Author(s): Padgurskas, Juozas;Rukuiža, Raimundas;Kupčinskas, Artūras;Kreivaitis, Raimondas
Title: Lubrication properties of modified lard and rapeseed oil greases with sodium and lithium thickeners
Is part of: Industrial Lubrication and Tribology. Bingley., 2015, Vol. 67, N 6
Extent: p. 557 - 563
Date: 2015
Keywords: Additives;Wear resistance;Bio-based greases;Ethanol mixing;Lar;Rapeseed oil
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
Internet: https://hdl.handle.net/20.500.12259/88771
Affiliation(s): Vytauto Didžiojo universitetas
Žemės ūkio akademija
Appears in Collections:Universiteto mokslo publikacijos / University Research Publications

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