Starting Point Dispersion Techniques for Polyurethane Dispersions Based on Sustainable Polyols

Environmental, health and safety concerns continue to drive rapid growth for environmentally friendly, low VOC coatings. Although bio-based materials have provided feedstock options which are more sustainable than fossil petroleum alternatives, use of recycled content has remained relatively unexplored. With this in mind, Resinate Materials Group has developed novel technology that allows us to create multi-functional polyols- designed for the production of PUDs- using post-consumer and post-industrial content, including recycled PET.

At the same time, the desire to maintain the high performance of solventborne systems is high, and expectations are set to continue to try to approach that level.  One key drawback to the waterborne processing methods is the inherent physical constraints of polyol viscosity.  First, you need a highly functioning polyol of select chemistry (polyester, polycarbonate, polyether, acrylic), but you also need critical molecular weight to build properties and reduce isocyanate costs.  With that requirement comes a higher viscosity, especially during the prepolymer stage.  This problem, many times, is met with the use of some solvent such as acetone or NMP.  Such choices result in either higher cost to strip solvent or higher VOC in the resulting coating.  Both are undesirable. The polyol is selected to have certain properties that contribute to the overall performance of the finished dispersion in its application.  These properties vary across a multitude of applications, but in most cases, harder, tougher, and more chemical resistant PUD films are highly desired.  Incorporation of recycled poly(ethylene terephthalate) (PET) into the polyol structure has proven to provide a nice balance of these properties, along with a high sustainability factor.  Introducing these polyols into the PUD arena has been challenging with the above mentioned molecular weight requirement and associated viscosity.  At Resinate, we have developed a series of polyols with high recycle (PET) and renewable content, designed for the production of PUDs.  We will describe the various factors that control the PUD process conditions, the final properties of the dispersion, and the performance of the films in ambient clear coats over metal.   The versatility of the system and range of applications will be evident.

Bio

Matt joined Resinate Materials Group in 2012 as a Chemist, contributing to the development of green chemistry solutions through polymer synthesis, coatings formulation and application testing. He currently serves as a Lead Chemist, managing customer and market driven product development and technical service support. Matt began his career at Dow Chemical in their Coating Materials Group, where he supported the development and commercialization of polyurethanes for industrial wood and metal applications. Matt has been named on six patents, and has co-authored several scientific publications. Matt holds a Bachelors of Science in Chemistry from Alma College.