Polyurethane functionalized by click chemistry and preparation method thereof

The invention discloses polyurethane functionalized by click chemistry and a preparation method thereof, and the preparation method comprises the following steps: adding toluene diisocynate and dehydrated polyether polyol into a three-neck flask in sequence for reaction to obtain a prepolymer; weighing a proper amount of hydrophilic monomer dimethylolpropionic acid and an intermediate, uniformly mixing with Nmethylpyrrolidone, slowly pouring into the three-neck flask to react with the prepolymer, and slowly adding a chain extender to react; adding acetone to reduce the viscosity, and adding triethylamine to neutralize; and finally, uniformly stirring in a stirrer, and slowly adding deionized water to obtain the polyurethane emulsion. The method has the advantages of simple reaction conditions, high yield, no toxic or harmful byproducts, and stable and easily-purified product. Moreover, the polyurethane coating prepared by the invention has antibacterial and antistatic functions, so that not only can the polyu