Development of a Novel Coating System using Photolatent Base Technology

Development of a Novel Coating System using Photolatent Base Technology

Himanshu Manchanda
Eastern Michigan University

The coatings industry is teeming with new inventions each year, with minimal exposure to hazardous chemicals and waste as one of its goals. The idea of reducing the harmful emissions from paints while improving upon their existing performance, has led to the exploitation of plenty of new chemistries and chemicals in the recent past. One such promising area lies in the development of a Novel Coating system using the click chemistry, combining the benefits of instant UV curing along with the replacement of harmful reactive diluents used for better film properties. Acrylic monomers have found widespread use as reactive diluents in the acrylic coating systems because of their reduced viscosity as well as their tendency to enhance the crosslinking density of the coating film. However, their usage is known to cause severe adverse health effects such as asthma, disturbances of the central nervous systems, liver toxicity among others. The focus of this research is to exploit the Michael Addition reaction for replacement of harmful acrylic monomers with acetoacetate-based resins synthesised in our labs. A photo base generator (PBG) has been used that generates in-situ a super base that is capable of instantly kicking off Michael-addition reaction resulting in rapid curing. The super base is also expected to catalyse moisture-curing reaction of the silane functional groups also present in the system. Thus a stable dual-cure system with a single trigger (UV) provides a compelling incentive for commercial exploitation. The results obtained so far, have indeed confirmed the same.