SYNTHESIS OF SOME POLYOL ESTERS DERIVED FROM DIBASIC ACIDS AND THEIR EVALUATION AS SYNTHETIC LUBRICATING BASE OILS

Abstract

The present work is generally directed to synthesis complex esters based on dibasic acids for lubricating oil. Eight complex esters were synthesized in two steps as two groups. In the first group two monoesters were prepared by reaction of malonic acid with amyl alcohol or 2-ethyl hexanol individually .The second group two monoesters were prepared based on adipic acid by the same reaction with the same alcohols. The four prepared monoesters were reacted with neopentyl glycol or trimethylol propane individually to prepare eight complex esters. The prepared complex esters were elucidated by using FTIR, H1-NMR and MS. The thermal stability of these esters was characterized by TGA. The optimum degree of esterification was followed by measuring (TAN). Evaluation of the prepared complex ester as synthetic lubricant was carried on the term of Viscosity Index(VI),Pour Point(PP) and Flash Point(FP) From the obtained data , it was found that some prepared complex esters exhibited the behavior of synthetic lubricating base oils. By comparing results of prepared complex esters and the commercial product, it was found that the complex esters achieved better values than commercial product in viscosity index, flash point and achieved the same values in pour point.