Abstract
The aim of present work was to obtain improved physicochemical properties and rheological characteristics of epoxidized waste cooking oil (WCO epoxide). To accomplish the objective, structural modification of waste cooking oil (WCO) was carried out by in situ epoxidation technique at 60 °C for 10 h with hydrogen peroxide (H2O2)-to-ethylenic unsaturation molar ratio, 1.5; acetic acid-to-ethylenic unsaturation molar ratio, 0.5 and 15 wt% catalyst (Amberlite IR-120, heterogeneous cation-exchange resin) loading. The product was confirmed by 13C-NMR, oxirane oxygen analysis, iodine value (IV). Thermo-oxidative stability of WCO epoxide and servo hydraulic lubricant (conventional) was determined by thermo-gravimetric analysis in inert as well as oxygen atmospheres and compared. Further, in order to improve WCO epoxide physicochemical properties, it was blended with waste cooking oil methyl esters (WCOME). All significant physical and rheological properties of WCO, WCO epoxide and their blends were estimated. Outcomes of the study revealed significant improvement in the thermo-oxidative stability and physicochemical properties of WCO epoxide compared to unmodified WCO and conventional hydraulic lubricant from servo.
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