Synthesis And Performance Of Polycarbonate-based Waterborne Polyurethane Containing Rosin Derivatives

With the development of green chemistry, the deep-processed products of renewable resources replacing of oil resources have good prospects. At the same time, compared with the traditional polyester polyols, polycarbonate-based waterborne polyurethane has both better performance and reducing the―carbon footprint‖. So it will become the highlights of combing the research and environmental protection. A serial of new waterborne polyurethane emulsion containing rosin derivaties structure were synthesized and the performances of emulsions and films were studied in this research.Hydroxyl-terminated acrylpimaric acid neopentyl glyol ester (ANGE) was synthesized through condensation reaction between neopentyl glyol and acrylpimatic acid (RA) which was synthesized through Diels-Alder addition with rosin and acrylic acid. The method of RA purification was improved to reduce use of solvent and operation easily as well.Synthesis and performance of waterborne polyurethane modified by acrylpimaric acid neopentyl glyol ester was studied and the process of rosin derivaties modified waterborne polyurethane was explored. Prepolymerization of ANGE, isophorone diisocyanate (IPDI), polyester diol (PBA) and dimethylol propionic acid (DMPA) gave a new waterborne polyurethane emulsion (WPU0A) of 33%~35% solid content. The influence of ANGE content(N),(namely hydroxyl radical molar ration of ANGE to total of ANGE and PBA), R value (namely molar ration of–NCO to -OH) and DMPA content on properties of WPU0A emulsion and film was discussed. The experiment results showed that the stable WPU0A emulsion was synthesized successfully when ANGE content was below 3/4, andWPU0A film had better mechanical properties and water resistance with increasing the content of ANGE; when the range of–NCO/-OH molar ration from 1.5 to 2.0, the ANGE-modified WPU0A could prepared well; with the increase of hydrophilic content, the stability of WPU increased while the water resistance reduced.Synthesis and performance of waterborne polycarbonate diols-based polyurethane acrylate hybrid emulsion containing the structure of hydroxyl-terminated acrylpimaric acid neopentyl glyol ester (WPU1A) can achieve the green chemical targets of recycle resources and low carbon. The synthesis process of ANGE modified polycarbonate-based waterborne polyurethane (WPU1) with ANGE, polycarbonate diols, IPDI and DMPA as main raw materials was studied (WPU1A was abtained by dripping the methacrylate monomers into WPU1). When R value (molar ratio of–NCO to -OH) was 1.5, the effect of dimethylol propionic acid (DMPA) content, hydroxyl radical molar ratio of ANGE(N1), polycarbonate and polyester diols and the ratio of acrylate to WPU1 content(N2) on performance of WPU1A hybrid emulsion and film was discussed. WPU1A had better emulsion and film properties when DMPA%, N1 and N2 were 5.5, 1/4 and 1:2 respectively. WPU1A showed better mechanical properties by comparision with polyester diols-based polyurethane-acrylate hybrid emulsion.