Pages 209–212
Abstract
Research summary supplied by the authors
In order to reduce the dependence on petro-based raw materials in the production of polyurethane, a biobased polyester polyol was synthesized from neatsfoot oil,which is one of bio-derived sources. Neatsfoot oil was first amidated with ethanolamine, ring-opened by epoxy respectively. Then it is polymerized with biobased succinic acid to obtain bio-based polyols. These polyols were subsequently used to synthesize waterborne polyurethane (WPU) with toluene diisocyanate (TDI). During the process, the amine value, hydroxyl value, acid value, molecular weight, emulsion stability, softness of film and application properties were systematically characterized. Structural change of the products were confirmed by infrared spectroscopy (FTIR). Results showed that the hydroxyl value of the fatty amide produced by amidation reaction was 150mgKOH/g and the conversion rate is 92%. After the epoxy ring-opening reaction, the hydroxyl value was increased to approximately 300mg KOH/g. The hydroxyl value and molecular weight of the final polyester polyol was 65mg KOH/g, 2097g/mol respectively. The WPU synthesized from the bio-based polyol and TDI has excellent emulsion stability whose films are flexible and possessed good dry/wet rub resistance. Performances of the WPU is comparable to that of commercial waterborne polyurethane products.