Synthesis and printing performances of waterborne polyurethane coating modified by hydroxyl silicone oil

In order to explore the pigment printing performances of waterborne polyurethane modified by hydroxyl silicone oil, polyurethanes containing different concentrations hydroxyl silicone oil were synthesized. The structures of the modified polyurethanes were characterized by FT-IR. The viscosity,curing speed, rubbing fastness and printing pattern definition of polyurethane coating modified by hydroxyl silicone oil concentrations were analyzed. The results show that the reaction of isocyanate and hydroxyl silicone oil was sufficient when the concentration of hydroxyl silicone oil was 10%. The water resistance,flexibility and chemical resistance of waterborne polyurethane curing film were excellent when the concentration of hydroxyl silicone oil was of 10%-20%. The viscosity of waterborne polyurethane coating was decreased,curing speed was increased,rubbing fastness was improved,and printing pattern definition was reduced,with the increase of the concentration of hydroxyl silicone oil.