Addition of lithium hydroxystereate into used cooking palm oil as bio-degradable grease formulation

Mohd Eza, Muhammad Najib (2019) Addition of lithium hydroxystereate into used cooking palm oil as bio-degradable grease formulation. Project Report. Universiti Teknikal Malaysia Melaka, Melaka, Malaysia. (Submitted)

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Abstract

In an age of technology are rapidly developing at the moment, the use of petroleum is increasing. In the same time the quantity is also decreased. One of them is also affected by this conflict is about the production of grease. To solve this problem, a study done by generating new grease using mineral resources base of vegetable oils that have been used. In this study, to produce a new grease using used cooking oil with the addition of Zinc Dialkyldithiophosphate (ZDDP) to improve the lubrication properties because (ZDDP) are materials that reduce the friction and reduce the erosion. Apart from the use of Zinc Dialkyldithiophosphate (ZDDP) in the production of another new grease additive used is to use Lithium Hydroxystereate. Lithium Hydroxystereate is a thickening agent which is used to transform the structure of oil into grease. Used palm oil is mixed with the same value of 2wt% of ZDDP and different value of thickening agent using 5wt%, 10wt%, 15wt% and 20wt% of Lithium Hydroxystereate. All samples were tested and characterized using laboratory tests such as ASTM D2266 four-ball tester, ASTM D2596, extreme pressure and Scanning Electron Microscope (SEM). Based on this study, the results show that grease using 5wt% Lithium Hydroxystereate has a coefficient of friction of 0.0646 and wear scar diameter 352.8 μm which is smaller and better compared to other samples. On the other hand, samples using 20wt% lithium hydroxystereate are able to withstand pressures of up to 400 Kg.f which is higher than other samples. Based on the test results it can be concluded that the addition of lithium values to the oil affects the wear coefficient of the wear scar diameter and the extreme pressure causes the value to increase

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