Modified waterborne polyurethane waterproof coating, and preparation method and application thereof

The invention discloses a modified waterborne polyurethane waterproof coating. The modified waterborne polyurethane waterproof coating comprises a mixed modifier, and the mixed modifier is a mixture of nano inorganic silicon resin and permeable high-molecular acrylic emulsion. According to the waterborne polyurethane waterproof coating disclosed by the invention, the mixture of nano inorganic silicon resin and permeable high-molecular acrylic emulsion is used as the modifier. When the nano inorganic silicon resin is applied to the waterborne polyurethane coating, the permeability of waterborne polyurethane is enhanced, and the nano inorganic silicon resin has high activity and can react with a cement base surface to further improve the hardness of the base surface, so that the bonding strength of the waterborne polyurethane waterproof coating and the base surface is greatly improved. Meanwhile, the base surface is rapidly sealed through the permeable high-molecular acrylic emulsion, the water absorption rate