Epoxy polyurethane dispersion as well as preparation method and application thereof

The invention relates to an epoxy polyurethane dispersion as well as a preparation method and application thereof. The preparation raw materials of the epoxy polyurethane dispersion comprise a combination of modified epoxy resin, a polyurethane prepolymer, a neutralizer and water, the mass ratio of the modified epoxy resin to the polyurethane prepolymer is (1-4): 1; the modified epoxy resin is prepared from the following raw materials: fatty acid containing conjugated double bonds, fatty acid without conjugated double bonds, vinyl siloxane and epoxy resin. The total mass of the fatty acid containing the conjugated double bonds, the fatty acid without the conjugated double bonds, the vinyl siloxane and the epoxy resin is 100%, and the mass percentage of the vinyl siloxane is 3-10%. According to the epoxy polyurethane dispersion provided by the invention, through selection of preparation raw materials and regulation and control of dosage, when the epoxy polyurethane dispersion is used in a coating, the coating