Structure and performance of waterborne polyurethane-acrylate composite emulsions for industrial coatings: effect of preparation methods

摘要

Waterborne polyurethane-acrylate (WPUA) composite emulsions were prepared by the physical blending method, graft emulsion polymerization method, and interpenetrating network (IPN)-based method using polytetramethylene glycol (PTMG), isophoronediisocyanate (IPDI), and acrylic monomers (methyl methacrylate (MMA) and butylacrylate (BA)) as the main raw materials. The WPUA polymers were characterized based on their water resistance, morphologies, thermal, spectroscopic and mechanical properties. Graft WPUA film had the highest tensile strength and the best thermal stability, indicating that the strength of the chemical bond between PU and PA plays an important role in modulating the performances of the WPUA films. The results showed that the graft WPUA has excellent integrated properties and thus a potential application in the coating industry.