| abstract |
The invention discloses a touch-dry UV-curable waterborne polyurethane dispersion and a preparation method thereof. Acrylic ester monomers, hydroxy acid monomers, isocyanates, catalysts, polymerization inhibitors, solvents and diluent monomers are mixed together, and the Stir the reaction at 50-70 °C until the mass concentration of isocyanate ions reaches 3-4%, and start to cool down; when the temperature drops below 40 °C, add a neutralizing agent and stir for 30-45 minutes, when the temperature begins to drop at a uniform speed, Stop stirring to obtain a urethane acrylate prepolymer; pour the urethane acrylate prepolymer into a dispersing cylinder, mix the chain extender and deionized water uniformly, add it into the dispersing cylinder, and then add deionized water to disperse, thereby A touch-dry UV-curable aqueous polyurethane dispersion was prepared. The invention not only has extremely excellent surface drying performance, but also has high gloss and hardness and good silver powder arrangement performance, and can be widely used in many fields such as making silver powder paint on plastics, and high-grade wood veneer. |