Abstract
Environmentally friendly multipurpose grease formulation has been synthesized by using Jatropha vegetable residual oil with lithium soap and multifunctional additive. The thus obtained formulation was evaluated for its tribological performance on a four-ball tribo-tester. The anti-friction and anti-wear performance characteristics were evaluated using standard test methods. The biodegradability and toxicity of the base oil was assessed. The results indicate that the synthesized residual oil grease formulation shows superior tribological performance when compared to the commercial grease. On the basis of physico-chemical characterization and tribological performance the vegetable residual oil was found to have good potential for use as biodegradable multipurpose lubricating grease. In addition, the base oils are biodegradable and non toxic.
Highlights
The worldwide trend to use more eco-friendly lubricating greases is motivated by environmental concerns [1]
No multipurpose lubricating greases having vegetable residual oil as base oil has been reported in the literature
The compositions of the different formulations prepared are given in the Table 1 and their tribological performance is shown in the Figures 1 and 2
Summary
The worldwide trend to use more eco-friendly lubricating greases is motivated by environmental concerns [1]. Total vegetable oil greases have been prepared by saponified castor oil as base oil and lithium and sodium soaps as thickener [8]. Because of their cost, synthetic ester oils are only used when the performance required cannot be achieved with mineral oils [9]. Vegetable oils and synthetic ester based greases gives better performance besides being eco-friendly and biodegradable. Multipurpose lubricating greases are colloid dispersive systems of base oil, thickener and additives [10]. The residual oil is a low cost material and has good potential for replacing the mineral base oil in the formulation of greases besides being biodegradable. No multipurpose lubricating greases having vegetable residual oil as base oil has been reported in the literature
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