▎ 摘　　要

NOVELTY - A multifunctional polyurea coating is formed by curing components (A) and (B) in mass ratio of 1:1.3-1.5. The component (A) is formed using raw materials comprising 30-55 pts. wt. modified isocyanate, 20-40 pts. wt. polyether polyol, 1-10 pts. wt. diluent, 1-10 pts. wt. flame retardant, and 2-10 pts. wt. modified carbon nanofibers. The modified isocyanate is a hydroxyl group-containing carbon nanofiber modified isocyanate. The modified carbon nanofiber is obtained by modifying the carbon nanofiber with hydroxyl at the surface with methyltrimethoxysilane. The component (B) is prepared using raw materials comprising 10-28 pts. wt. chain extender, 30-55 pts. wt. amino-terminated polyether, 5-15 pts. wt. diluent, 1-5 pts. wt. graphene, 1-10 pts. wt. foaming agent, 4-6 pts. wt. modified nano-cerium trifluoride, 3-5 pts. wt. modified nano-lanthanum trifluoride and 12-20 pts. wt. additive. USE - Multifunctional polyurea coating for power battery trays (claimed). ADVANTAGE - The multifunctional polyurea coating has excellent flame retardance, and is stable and efficient. The coating has tensile strength of 40 MPa, elongation at break of 450%, tear strength of 121 kN/m, contact angle of 153° and adhesion to steel of 16.57 MPa. DETAILED DESCRIPTION - A multifunctional polyurea coating is formed by curing components (A) and (B) in mass ratio of 1:1.3-1.5. The component (A) is formed using raw materials comprising 30-55 pts. wt. modified isocyanate, 20-40 pts. wt. polyether polyol, 1-10 pts. wt. diluent, 1-10 pts. wt. flame retardant, and 2-10 pts. wt. modified carbon nanofibers. The modified isocyanate is a hydroxyl group-containing carbon nanofiber modified isocyanate. The modified carbon nanofiber is obtained by modifying the carbon nanofiber with hydroxyl at the surface with methyltrimethoxysilane. The component (B) is prepared using raw materials comprising 10-28 pts. wt. chain extender, 30-55 pts. wt. amino-terminated polyether, 5-15 pts. wt. diluent, 1-5 pts. wt. graphene, 1-10 pts. wt. foaming agent, 4-6 pts. wt. modified nano-cerium trifluoride, 3-5 pts. wt. modified nano-lanthanum trifluoride and 12-20 pts. wt. additive. The modified nano-cerium trifluoride is prepared by mixing nano-cerium trifluoride dissolved in magnesium hydroxysilicate with oleic acid and polydimethylsiloxane. The modified nano-lanthanum trifluoride is prepared by hydrothermally modifying nano-lanthanum trifluoride using vinyltriethoxysilane and hexamethyldisilazane as modifier. An INDEPENDENT CLAIM is included for preparation of the multifunctional polyurea coating, which involves mixing the components (A) and (B) at 50-70℃, and spraying.