Wear-resistant waterborne polyurethane coating and preparation method thereof

The preparation method comprises the following steps: adding water, a water-based dispersing agent, a water-based wetting agent, a water-based defoaming agent, a water-based leveling agent and modified water-based polyurethane into a container, and stirring to obtain the wear-resistant water-based polyurethane coating, the preparation method of the modified waterborne polyurethane comprises the following steps: mixing polycarbonate diol, 2, 2-dihydroxymethylpropane and an intermediate 3, adding isophorone diisocyanate and a catalyst dibutyltin dilaurate, and carrying out a reaction; then adding a cross-linking agent trimethylolpropane, continuing the reaction, and adding triethylamine for neutralization to obtain a waterborne polyurethane prepolymer; adding deionized water to form an emulsion; finally dropwise adding hydrazine hydrate for reaction; cooling is performed, and then N-2-aminoethyl-3-aminopropyl trimethoxy silane is added, so that a modified polyurethane emulsion is obtained; the polyurethane coat