Lubrication properties of dodecanedioate esters-based bio-lubricant

Abstract

Interest in the synthesis of new bio-lubricants with improved lubricity properties and higher quality is increasing. This study aimed to evaluate the bio-lubrication properties of synthesized dodecanedioate esters-based bio-lubricant. Thirteen samples of dodecanedioate esters with different chemical structures were synthesized. The results showed that di-2-methylbutyl dodecanedioate (D2MBD), di-2-ethylbutyl dodecanedioate (D2EBD), and di-2-ethylhexyl dodecanedioate (D2EHD) showed good low-temperature properties with very low pour point (PP) values of -45 oC, -35 oC, and -55 oC, respectively. Di-oleyl dodecanedioate (DOlD) showed a remarkable flash point (FP) value of 300 oC; however, it showed poor oxidative stability (OXS) at 177 oC. The results showed increases in flash point (FP), viscosity index (VI), and oxidative stability (OXT) with increasing carbon chain length and branching in the employed alcohol. Furthermore, friction coefficient, Newtonian and non-Newtonian properties were tested. The results showed that the tested dodecanedioate esters, which have high molecular weight had a low friction coefficient, and they were classified as non-Newtonian fluids except DOLD was classified as a Newtonian fluid. In general, based on the results, the branched dodecanedioate esters can be used as lubricant without additives.