Epoxy Acyloxy Castor Polyol Esters: Multifunctional Base Oil for Aviation to Marine Formulations

Abstract

Abstract: With an intention to develop base oils with multi-functional properties, about 16 epoxy acyloxy castor polyol esters were prepared. Acyloxy castor polyols were prepared by the acylation of hydroxy functionality of castor fatty acids (acetylated, propionylated, butanoylated and hexanoylated) using kieselguhr-G method followed by reaction with polyols namely trimethylolpropane (TMP), neopentyl glycol (NPG), pentaerythritol (PE) and 2-ethyl hexanol (2-EtH) in 95–98% yields. Acyloxy castor polyol esters were epoxidized at the double bond to yield epoxy acyloxy castor polyol esters in 98–99% yields. The base stocks were characterized by 1H and 13C NMR, ESI–MS. When evaluated for base oil properties, exhibited high viscosity indices (86.27 to 427.01), very low pour points (–52 to –42°C) and high oxidative (30 to 50 min) and thermal (200 to 335°C) stabilities. These base stocks with good viscosity properties can withstand heavy loads, supported by low wear scar diameter. Overall the base stocks with superior properties can find applications right from aviation to marine engine formulations. [Figure not available: see fulltext.] © 2022, Pleiades Publishing, Ltd.