▎ 摘　　要

NOVELTY - Coating agent comprises 100 pts. wt. polyurethane prepolymer, 25 pts. wt. poly(methyl methacrylate) resin composition, 8 pts. wt. carbon nanotubes, 5 pts. wt. graphene, 2 pts. wt. alkoxysilane, 2 pts. wt. carnauba wax, 3 pts. wt. filler, 0.3 pts. wt. antibacterial nanopowder, 0.2 pts. wt. Dendropanax morbiferus tree extract, 0.2 pts. wt. antioxidant and 0.4 pts. wt. 1,3,5-triglycidyl isocyanurate. The polyurethane prepolymer is prepared by mixing 1 mol.% dicarboxylic acid and 1.5-2 mol.% polyol at 250-300 degrees C for 10-20 hours, and performing condensation reaction of polyester polyol. The dicarboxylic acid includes adipic acid or succinic acid. The polyol includes 1,6-hexanediol, 1,3-propanediol, and/or poly(tetramethylene ether)glycol. USE - The coating agent is useful for leather products, i.e. bags, clothes, shoes, and wallets. ADVANTAGE - The coating agent can be applied to leather to remove surface contaminants and improve the flexibility, gloss, firmness, and dyeing durability of leather products, i.e. bags, clothes, shoes, and wallets, can protect products manufactured using leather as a material i.e. belts, gloves and furniture. DETAILED DESCRIPTION - Coating agent comprises 100 pts. wt. polyurethane prepolymer, 25 pts. wt. poly(methyl methacrylate) resin composition, 8 pts. wt. carbon nanotubes, 5 pts. wt. graphene, 2 pts. wt. alkoxysilane, 2 pts. wt. carnauba wax, 3 pts. wt. filler, 0.3 pts. wt. antibacterial nanopowder, 0.2 pts. wt. Dendropanax morbiferus tree extract, 0.2 pts. wt. antioxidant and 0.4 pts. wt. 1,3,5-triglycidyl isocyanurate. The polyurethane prepolymer is prepared by mixing 1 mol.% dicarboxylic acid and 1.5-2 mol.% polyol at 250-300 degrees C for 10-20 hours, and performing condensation reaction of polyester polyol. The dicarboxylic acid includes adipic acid or succinic acid. The polyol includes 1,6-hexanediol, 1,3-propanediol, and/or poly(tetramethylene ether)glycol. The method comprises mixing 60-80 pts. wt. polyester polyol, 10-20 pts. wt. organic solvent, 20-30 pts. wt. bio polyfunctional polyol compound, 5-15 pts. wt. isocyanate, 0.1-0.5 pts. wt. radical initiator, and reacting at 130-150 degrees C for 5-7 hours while purging nitrogen. The organic solvent includes toluene, methyl ethyl ketone, ethyl acetate, acetone and/or dimethylformamide. The isocyanate includes toluene diisocyanate, 4,4'-diphenylmethane diisocyanate, hexamethylene diisocyanate, isophorone diisocyanate and/or 4,4'-methylenebis(cyclohexyl isocyanate). The radical initiator includes benzoyl peroxide and/or azobisisobutyronitrile. The polyurethane prepolymer has weight-average molecular weight of 30000-50000 g/mol. The PMMA resin composition is produced by (i) mixing 30-50 pts. wt. PMMA resin, 20-40 pts. wt. n-butyl acrylate monomer, 10-30 pts. wt. methyl methacrylate (MMA) monomer, 5-10 pts. wt. 2-hydroxy ethyl methacrylate monomer, 2-5 pts. wt. methacrylic acid (MAA) monomer and 2-5 pts. wt. tripropyleneglycol diacrylate (TPGDA) monomer, and heating at 60-70 degrees C to prepare a first mixture, (ii) preparing a second mixture by mixing 0.1-1 pts. wt. N,N-dimethyl-p-toluidine, and curing accelerator, with the first mixture at 40-50 degrees C, and (iii) preparing a PMMA resin composition by cooling the second mixture to room temperature and mixing 1-2 pts. wt. dibenzoyl peroxide as curing agent. The filler is prepared by mixing 1 pts. wt. talc and 2 pts. wt. silica, where the talc has hardness (morhs) of 3, specific gravity of 2.5-2.8, and specific surface area of 0.036-1 m(2)/g. The antibacterial nanopowder is prepared by mixing pure jit nanopowder and cloisonne nanopowder in weight ratio of 1:1.