▎ 摘　　要

NOVELTY - Graphene-carbon nanotube modified polyurethane elastomer is prepared by adding graphene oxide to toluene solvent, ultrasonically dispersing, reacting, filtering and washing, adding sodium hydroxide and cyano-modified graphene oxide to the ethanol solvent, stirring and reacting, adjusting pH, filtering, washing the filtrate and drying, adding carboxylated graphene, 4,4-diaminobiphenyl and concentrated ammonia to distilled water solvent,, stirring and refluxing, filtering the product and cleaning, removing the unreacted 4,4-diaminobiphenyl, drying, oxidizing and filtering, washing with dilute hydrochloric acid and aqueous ammonia, dripping concentrated hydrochloric acid to the mixture of aryl aminated graphene and sodium nitrite, adding acidified multi-walled carbon nanotubes, reflux heating, washing, filtering, drying, and preparing carbon nanotube-modified graphene, and dispersing carbon nanotube-modified graphene in tetrahydrofuran, ultrasonically treating, drying and curing. USE - As graphene-carbon nanotube modified polyurethane elastomer. ADVANTAGE - The polyurethane elastomer has high thermal conductivity, enhances the mechanical properties, and improves the thermal conductivity of polyurethane materials. DETAILED DESCRIPTION - Graphene-carbon nanotube modified polyurethane elastomer is prepared by (i) adding graphene oxide to toluene solvent in a mass ratio of 1:20-50 in a nitrogen atmosphere, ultrasonically dispersing for 0.5-1.5 hours through an ultrasonic device, using azobisisobutyronitrile as the initiator, reacting at 60-80 degrees C for 5-10 hours, filtering and washing the product, and preparing cyano-modified graphene oxide after drying, (ii) adding sodium hydroxide and cyano-modified graphene oxide in a mass ratio of 10:10-30 to the ethanol solvent, stirring and reacting at 70-90 degrees C for 35-45 hours, adjusting the pH of the solution to 2-3 after filtering, washing the filtrate with distilled water and drying to prepare carboxylated graphene, (iii) adding carboxylated graphene to distilled water solvent, and 4,4-diaminobiphenyl and concentrated ammonia after ultrasonic dispersion, stirring and refluxing at 90-110 degrees C for 5-10 hours, filtering the product and cleaning with ethanol ultrasonically, removing the unreacted 4,4-diaminobiphenyl, drying at 50-80 degrees C for 20-30 hours to prepare aryl aminated graphene, (iv) oxidizing and filtering the multi-walled carbon nanotubes filtered into a mixture of concentrated sulfuric acid and concentrated nitric acid in a volume ratio of 100:(25-40), washing with dilute hydrochloric acid and aqueous ammonia to remove impurities and to obtain acidified multi-walled carbon nanotubes, dripping concentrated hydrochloric acid to the mixture of aryl aminated graphene and sodium nitrite, adding acidified multi-walled carbon nanotubes, reflux heating at 60-90 degrees C for 3-6 hours, washing the product with hydrochloric acid and distilled water, filtering, drying, and preparing carbon nanotube-modified graphene, and (v) dispersing carbon nanotube-modified graphene in tetrahydrofuran, ultrasonically treating for 20-50 minutes, and adding thermoplastic polyurethane elastomer, mixing the mixture for 3-6 hours, ultrasonically treating for 0.5-2 hours, pouring into PTFE mold, drying and curing to prepare graphene-carbon nanotube modified polyurethane elastomer.