Enhancing physicochemical properties of coconut oil for the application of engine lubrication

Journal article

Hettiarachchi, S., Kellici, S., Kershaw, M and Bowen, D.J. (2023). Enhancing physicochemical properties of coconut oil for the application of engine lubrication. Tribology International . 190, p. 109060. https://doi.org/10.1016/j.triboint.2023.109060
AuthorsHettiarachchi, S., Kellici, S., Kershaw, M and Bowen, D.J.
Abstract

Engine lubricants require specific physical and chemical properties to function effectively and extend the lifespan of engines. Coconut oil (CCO) is an abundant, renewable, and environmentally friendly bio-based stock that has the potential to be a viable alternative to conventional mineral oil-based lubricants. In this study, we investigated the potential of CCO as a lubricant and formulated different blends with additives to enhance its physicochemical characteristics. Polymethylmethacrylate (PMMA), styrenated phenol (SP) and potassium hydroxide (KOH) were used as additives in varying concentrations. We evaluated the formulations for low pour point (PP), high viscosity index (VI) and total base number (TBN) using differential scanning calorimetry (DSC), viscometry, and titration methods (following ASTM D2270 and ASTM D2896–21 respectively). The formulated CCO was also tested for thermal, oxidative, and shear stability using thermogravimetric analysis and rheometry. The optimal formulation exhibited a PP reduction from 21 °C to 6 °C, improved VI from 169 to 206, and a TBN adjustment from 0 to 4.14 mg KOH g-1. The formulated CCO also exhibited superior thermal, oxidative, and shear stability compared to unformulated CCO and reference oil (15W40). Our results suggest that blending CCO with additives can effectively enhance its suitability for engine lubrication, opening up new possibilities for environmentally sustainable and renewable lubricants.

Keywordstribology
Year2023
JournalTribology International
Journal citation190, p. 109060
PublisherElsevier
ISSN1879-2464
Digital Object Identifier (DOI)https://doi.org/10.1016/j.triboint.2023.109060
Web address (URL)https://www.sciencedirect.com/science/article/pii/S0301679X23008484
Publication dates
Print31 Oct 2023
Publication process dates
Accepted28 Oct 2023
Deposited16 Nov 2023
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Open
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