Research on the preparation of solvent-free anionic polyurethane-acrylate emulsion and its film performance

Solvent-free anionic polyurethane-acrylate emulsion was prepared by in-situ polymerization with isophorone disocyanate(IPDI),polycaprolactone diols(PCL),2,2-dimethylolbutyric acid(DMBA),2-hydroxyethyl methacrylate(HEMA),glycidyl methacrylate(GMA),methyl methacrylate(MMA),butyl acrylate(BA) as raw materials.Simultaneously,effects of n(NCO)/n(OH)(R value),content of hydrophilic chain extender(DMBA) and hard-monomer(MMA) on properties of the WPUA emulsion and its films were systematically studied.It was found that the WPUA emulsion particles presented the core-shell structure,and the average particle size was 98.98nm with narrow particle size distribution when R=1.2,m(DMBA)=3.1%,m(MMA)=26.6%.Furthermore,the emulsion film was endowed with excellent mechanical property that the tensile strength was 17.02MPa,the elongation at break was 109% and the water absorption was 6.9%.