Preparation and characterization of a self -matting coating based on waterborne polyurethane-polyacrylate hybrid dispersions

A series of semi-gloss waterborne polyurethane-polyacrylate (PUA) hybrid dispersions containing different weight ratios of styrene/butyl acrylate monomers were first synthesized by solution polymerization and then phase inversion. The average particle size of PUA dispersions particle was analyzed by dynamic light scattering (DLS) measurement. Its core-shell morphology was characterized by transmission electron microscopy (TEM), whose structure was also confirmed by FTIR and nuclear magnetic resonance carbon spectroscopy (C-13-NMR). The surface morphology of the PUA films was observed by scanning electron microscopy (SEM). The thermal properties of the PUA films were characterized by differential scanning calorimetry (DSC) analysis, and the core-shell hybrid latex films showed phase separation behaviors. The results showed that the PUA films had a self-rough surface, and exhibited excellent adhesion strengths and good hardness.