Abstract
Herein we report the synthesis of some fatty acid, fatty alcohol and acrylate derivatives as friction depressive additives for ultra-low sulphur diesel (ULSD). The high frequency reciprocating rig (HFRR) was employed to measure the wear scar diameter (WSD) of the samples. The lubricating property of the newly synthesized samples [2a, (4a-c) and (5a-c)] was studied by dosing them to ULSD at 200 ppm (wt/vol) concentrations. Amongst them, ester derived from OLA/Polyol (4c) showed the best lubrication enhancing property (WSD 328 µm) at 200 ppm(wt/vol) dosage level. Interestingly, it maintains lubricity characteristics even at a lower blending concentration of 100 ppm with a WSD value (446 µm) lower than the than the accepted value (460 µm). Notably, additives containing polar functional groups and long non-polar carbon backbone exhibited significant lubricity properties with low WSD values. Moreover, it possesses long term antiwear stability when blended with the diesel fuel and do not alter or negatively influence the physical and chemical parameters of the diesel. The FESEM and EDS analysis revealed the formation of thin defensive layer of the additive between the moving metal surfaces supporting the friction reducing properties of the additives.
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