One-component scraping-type polyurea coating and preparation method thereof

The invention provides a one-component scraping-type polyurea coating and a preparation method thereof. The one-component polyurea aslo comprises prepolymer isocyanate and a small quantity of ester diluting agent, wherein the ester diluting agent refers to frequently-used esters such as ethyl acetate and dimethyl oxalate; the molar ratio of NH(b)2/(/b) in terminated polyether amine to NCO in the prepolymer isocyanate is (1:1)-(1:2.5); and the molar ratio of the terminated polyether amine, the prepolymer isocyanate and the ester diluting agent is (10:10:2)-(10:25:2). The preparation method comprises the following steps: preparing the terminated polyether amine; mixing the terminated polyether amine and the isocyanate according to the proportion; adding other selectable materials; and preparing the one-component scraping-type polyurea coating. The one-component scraping-type polyurea coating provided by the invention has good storage stability, does not contain solvents, does not need the diluting agent or needs few diluting agent and does not generate CO2; the surface dry time and the hard dry time of the one-component scraping-type polyurea coating are short; and the one-component scraping-type polyurea coating has strong adhesive force, resists moisture and corrosion and can serve as protective coating in the fields such as high-speed rails, underground construction, bridges, coast and roofs.