Cation water polyurethane/acrylic ester composite emulsion and preparation method thereof

The invention relates to cationic water-based polyurethane/acrylic ester composite emulsion and the preparation process, belonging to the chemical product and preparation technology field. Raw materials comprise diisocyanate mixture, polyhydric alcohol, organotin catalyst, chain extender, thinner, neutralizing agent and initiating agent. The preparation process comprises adding polyhydric alcohol into a reactor to dehydrate in vacuum, adding into diisocyanate mixture and organotin catalyst, conducting prepolymerization reaction to synthesize prepolymer with isocyanate-termi-nated, coldly adding thinner to dilute and to condense and reflow, adding chain extender to obtain mixture through chain extending reaction, cooling down, adding neutralizing agent to finish salt-forming reaction, regulating pH value, adding deionized water to conduct dispersed emulsification to obtain cationic water-based polyurethane elusion, and heating up and adding initiating agent to initiate free radical polymerization reaction to prepare composite elusion. The cationic water-based polyurethane/acrylic ester composite emulsion is synthesized through adopting non solvent process with low pollution and environment-friendly, increases solvent resistance, water resistance and tensile strength of glue film through introducing micro-cross-linked structure, increases hydrolytic stability of the glue film through introducing carbodiimide structure, and increases elongation at break and elasticity property through of glue film through introducing 2, 4-MDI.