Waterborne elastic coating and preparation method thereof

The invention relates to a water-based elastic coating and a preparation method thereof, and relates to the technical field of preparation of water-based coatings, in particular to a water-based environment-friendly coating which is prepared from the following raw materials in parts by weight: 900-1100 parts of isophorone diisocyanate; 2500 to 3000 parts of poly (butylene adipate) glycol; 140 to 160 parts of a chain extender; 410 to 450 parts of an end capping agent; 1-2 parts of a polymerization inhibitor; and 7800 to 10000 parts of deionized water. And 120 to 170 parts of an auxiliary agent. The preparation method of the water-based elastic coating comprises the following steps: adding an end-capping reagent into a polyurethane emulsion, continuously stirring, raising the temperature, adding p-hydroxyanisole, continuously raising the temperature, keeping the temperature, reacting for 2-3 hours, cooling to room temperature after the reaction is completed, thereby obtaining a water-based polyurethane emulsion