Nano titanium dioxide-waterborne polyurethane antibacterial coating and preparation process thereof

The invention relates to the technical field of antibacterial coatings, and discloses a nano titanium dioxide-waterborne polyurethane antibacterial coating and a preparation process thereof.3, 4-dihydroxyphenylalanine and ethylene glycol diglycidyl ether are used as reactants, a novel bis (hydroxylamine propionic acid catechol) compound is synthesized, and the nano titanium dioxide-waterborne polyurethane antibacterial coating has the advantages that the nano titanium dioxide-waterborne polyurethane antibacterial coating is prepared; the water-based chain extender contains double secondary hydroxyl groups and double carboxyl groups, can be used as a water-based chain extender of polyurethane, and contains a catechol structure; the preparation method comprises the following steps: carrying out a coordination reaction on a catechol structure of a bis (hydroxylamine propionic acid catechol) compound and nano titanium dioxide to realize surface modification of the nano titanium dioxide, and then carrying out a ch