▎ 摘　　要

NOVELTY - An elastic garment material is prepared by mixing modified polyurethane composite material and acrylic grafted polypropylene, adding to a twin-screw extruder to extrude pellets, obtaining polypropylene graft copolymer, mixing polypropylene graft copolymer, polypropylene, graphene, ethylene-ethyl acrylate copolymer and antioxidant, heating, melting, adding coupling agent, mixing, extruding, and weaving. The modified polyurethane composite material is prepared by adding hydrophilic polyether polyol to reactor, cooling, adding toluene diisocyanate, heating to 60-70 degrees C, reacting for 4-6 hours, adding diphenylmethane diisocyanate, heating to 80-90 degrees C, reacting for 1-2 hours, obtaining component (A), adding silicone-treated melamine formaldehyde resin to cellulose nanofiber/silica precursor solution, adding phosphoric acid to adjust pH to 3-4, stirring, obtaining component (B), mixing component (A) and component (B), stirring, casting in a molding, and curing. USE - Elastic garment material. ADVANTAGE - The lightweight elastic garment material has excellent resilience performance and durability, and can be prepared by simple process on large-scale. The elastic garment material can almost return to its original state after being in a deformed state for long period of time. DETAILED DESCRIPTION - An elastic garment material is prepared by mixing modified polyurethane composite material and acrylic grafted polypropylene, adding to a twin-screw extruder to extrude pellets, obtaining polypropylene graft copolymer, mixing polypropylene graft copolymer, polypropylene, graphene, ethylene-ethyl acrylate copolymer and antioxidant, heating, melting, adding coupling agent, mixing, extruding, and weaving. The modified polyurethane composite material is prepared by adding hydrophilic polyether polyol to reactor, removing water at 100-120 degrees C and -0.1 to -0.3 MPa for 2-3 hours, cooling to room temperature, adding toluene diisocyanate, heating to 60-70 degrees C, reacting for 4-6 hours, adding diphenylmethane diisocyanate, heating to 80-90 degrees C, reacting for 1-2 hours, obtaining component (A), adding silicone-treated melamine formaldehyde resin to cellulose nanofiber/silica precursor solution, adding predetermined amount of phosphoric acid to adjust pH to 3-4, stirring at 500-700 rpm for 15-25 minutes, obtaining component (B), mixing component (A) and component (B) in a mass ratio of 1:2, stirring at 600-800 rpm, casting in a molding, and curing. The silicone-treated melamine-formaldehyde resin is prepared by adding melamine, formaldehyde solution and silicone to a reactor, adding sodium hydroxide solution, adjusting pH to 8-9, adding to water bath at 80-90 degrees C, stirring at 150-200 rpm for 1-2 hours, adding aqueous polyvinyl alcohol solution, and reacting for 1-2 hours. The cellulose nanofiber/silica precursor solution is prepared by mixing sodium silicate and water, adding hydrochloric acid to adjust pH to 4-5, heating to 50-70 degrees C, stirring at 100-150 rpm for 20-30 minutes, adding polyethylene glycol, stirring for 10-15 minutes, obtaining silica hydrosol, adding cellulose nanofiber suspension, and stirring at 800-1200 rpm for 15-25 minutes.