Preparation and Properties of Urethane Oil from Jatropha Oil

Abstract

In this study, jatropha oil was reacted with glycerol and toluene diisocyanate to obtain urethane oil at hydroxyl to isocyanate ratio of 1:0.8 with methanol acting as a blocking agent. The prepared urethane oil was characterized for molecular weight and its properties were determined and compared with those of the linseed oil-modified and commercial urethane oils. It was found that the jatropha-modified urethane oil was a yellowish viscous liquid with a number-average molecular weight of 2,673. The urethane oil prepared from jatropha oil took longer time to dry than the linseed oil-modified and commercial urethane oils. Results showed that the film properties of the jatropha-modified urethane oil were comparable to those of the commercial urethane oil. The film exhibited good hardness, excellent flexibility and adhesion, and high impact strength. Additionally, it also showed excellent water resistance but only fair alkali resistance.