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.