Abstract
AbstractLubricating greases constitute a semi-fluid of lubricants with particular properties mainly attributed to the oil viscosity and the chemical reaction between the base stock and thickener compound. This work deals with the development and rheological characterization of a bio-based lubricating grease formulation based on different ratios of the thickener composition. The bio-grease was formulated by palm TMP ester thickened with calcium complex soap that comprises 0.8–1.2 weight ratios of calcium hydroxide and an equal ratio of stearic and benzoic acids. The grease consistency was determined according to the NLGI grade, whereas the rheological behaviour was characterized through the viscous flow measurements and shear stress – shear rate relationship. Results obtained show that the higher calcium hydroxide element in the thickener composition yielded softer palm grease with a viscous structure. Conversely, the lower content of calcium hydroxide or an excess of the acids in the formulated palm grease yielded the higher consistency or harder grease, with viscoelastic liquid structure.KeywordsPalm greaseCalcium complex soapConsistencyRheology
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