Abstract
Biodegradable vegetable oil-based lubricating oil is a better auxiliary for mineral-based lubricants as their viscosity index, flash point, lubricity is high. Nonetheless, their limited viscosity range is a major constraint of their usage as lubricating oil. Polymers have proven their capability of increasing the viscosity of vegetable oils without adversely affecting their lubricating properties. Potentially of use of oxidized polyethylene (OPE) as a viscosity booster of palm oil to use as a lubricating oil is studied adding several weight percentages of OPE to the palm oil independently. The addition of 1.75 wt% of OPE to the palm oil resulted in a blend with comparable kinematic viscosity to H68 and the addition of 2.0 wt% of OPE to the palm oil resulted in a blend with comparable kinematic viscosity to SAE30. Palm oil behaves as Newtonian fluid at low temperatures and as the temperature increases, it behaves as shear thickening fluid while the addition of OPE cause to shear thinning behavior.
Highlights
The key function of a lubricant is to lessen the resistance to movements between two rubbing surfaces by forming an oil film reducing friction and wear
Determination of uncertainties of the measured parameters and calculated parameters was done according to the method proposed by Kline and McClintock as described by Moffat in 1988.38 If R is a function of independent variables x1, x2, x3... xn, uncertainty is given by, wR
Palm oil consists of about 40% saturated, 50% monounsaturated and 10% of polyunsaturated fatty acids
Summary
The key function of a lubricant is to lessen the resistance to movements between two rubbing surfaces by forming an oil film reducing friction and wear. It cools the system by absorbing the heat generates, prevent corrosion by preventing reacting moisture and oxygen with surfaces, clean the system by washing away sludge and varnish, and seals the moving parts.[1] Mainly due to rising in automotive production demand for lubricants rise and according to the estimations global lubricant consumption is nearly 30–40 million tons per year.[2]. Vegetable oil-based lubricants can perform well in applications with a higher possibility of explosions as they are composed of high molecular weight triglyceride molecules results in low volatility and high flash point. As vegetable oil molecules oppose good affinity to metal surfaces induce good lubricity and superior anti-corrosion properties.[5,6]
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