CASTOR OIL WATERBORNE POLYURETHANES FROM A BIOBASED CARBOXYLIC ACID

HORMAIZTEGUI, M.E. VICTORIA; MUCCI, VERÓNICA L.; ARANGUREN, MIRTA I.

Bangkok

Exposición; Plastics Processing Exhibition & Summit; 2017

From the last few decades, bio based polyurethane have been used extensively due to the increasing concerns about the consumption of nonrenewable resources. Specially, waterborne polyurethane (WBPU) derived from vegetable oil have been developed in order to reduce the emissions of volatile organic compounds (VOCs) into the atmosphere in comparison with the solvent borne polyurethane especially during coating application.[1] In addition, most of the WBPUs are synthesized using dimethylolpropionic acid (DMPA) to introduce an ionic center in the molecular structure. Instead, in the present work, a bio-genic reagent, tartaric acid (TA), was used with that aim. TA can be obtained as a by-product from the processing of grapes for wine.[2], [3]Bio-based WBPUs were synthesized from castor oil (CO) and tartaric acid (TA). The other reagents used were isophorone diisocyanate (IPDI), triethylamine (TEA) and polycaprolactone diol (PCL), which was used to contribute 15% to the OH groups in the one or the formulation in order to improve the mechanical properties of the films obtained. The reaction was carried out in two steps. The first stage consists of the reaction of the CO and the PCL with IPDI, and the second reaction stage consists of the addition of the TA. The amine was introduced and finally water was added under vigorous stirring to obtain the nanoparticle dispersion.FTIR analysis was performed on the films to evaluate the success of the reactions and the in order to monitor the progress of the reaction over time, samples were taken during the synthesis and were analyzed. Also, the films were characterized by XRD, TGA, DSC and DMA. The authors thank CONICET (PIP 0866), ANPCyT (PICT140732) and UNMdP (15 / G430-ING436 / 15) for funding this research.