Self-repairing antibacterial waterborne polyurethane as well as preparation method and application thereof

The invention discloses self-repairing antibacterial waterborne polyurethane as well as a preparation method and application thereof, and belongs to the technical field of functional coatings. The preparation method comprises the following steps: carrying out a prepolymerization reaction on polyester diol, a monomer for forming multiple hydrogen bonds and diisocyanate under the action of a catalyst, adding a coumarin monomer and a quaternary ammonium salt monomer for a chain extension reaction, adding a neutralizer for neutralization, and then carrying out an emulsification reaction to prepare the self-repairing antibacterial waterborne polyurethane. The material is endowed with mechanical properties by utilizing a self-crosslinking structure of multiple hydrogen bonds and coumarin formed among molecular chains, the self-repairing efficiency of the material is effectively improved by utilizing the reversibility of the multiple hydrogen bonds and coumarin and the promotion effect of the ...