▎ 摘　　要

NOVELTY - Silicone rubber/graphene/carbon nano-tube nano-composite material comprises silicone rubber filled into a three-dimensional continuous conductive network skeleton constructed by graphene/carbon nano-tubes, and the conductive skeleton is made of graphene. The three-dimensional continuous porous material interwoven with the carbon nano-tubes is composed of 100 pts. wt. silicone rubber, 0.05-1 pts. wt. graphene and 0.01-0.5 pts. wt. carbon nano-tube. USE - The material is useful for electromagnetic shielding (claimed). ADVANTAGE - The material achieves high electrical conductivity and outstanding electromagnetic shielding performance at low filler loadings ( less than or equal to 1.5 wt.%), where the conductivity can reach more than 100 seconds/m, electromagnetic shielding effectiveness in the X-band (8.2-12.4 GHz) can reach up to 35 dB. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for preparing the material, comprising constructing three-dimensional continuous graphene/carbon nano-tubes conductive network skeleton, backfilling silicone rubber and vulcanizing; or (i) carrying out ultrasonic treatment in an aqueous medium or performing high-speed stirring of graphite oxide to separate graphene oxide to obtain aqueous graphene oxide dispersion, where the graphite oxide used is prepared by the modified Hummers method, concentration of graphite oxide is 1-15 mg/ml, the ultrasonic treatment condition is 40-500 W/25-500 kHz/20-60 minutes and high-speed stirring condition is 3000-12000 revolutions/minute/30-120 minutes, (ii) adding carbon nano-tubes to the graphene oxide aqueous dispersion, carrying out ultrasonic treatment or high-speed agitation to obtain a uniform and stable aqueous dispersion of graphene oxide/carbon nano-tubes hybrid particles, where the concentration of graphene oxide used is 1-10 mg/ml, and the concentration of carbon nano-tubes is 0.1-10 mg/ml, ultrasonic treatment conditions are 40-500 W/25-500 kHz/1-60min; high-speed stirring conditions are 500-10000rpm/1-60 minutes , (iii) adding a chemical reducing agent to the graphene oxide/carbon nano-tubes hybrid particle aqueous dispersion, heating the chemically reduced graphene oxide/nano-tubes hydrogel, where the chemical reducing agent used are hydrazine hydrate, dimethyl hydrazine, benzoquinone, p-toluenesulfonylhydrazide, hydrogen iodide, tannic acid, pyrogallic acid, vitamin C, aniline, ethylenediamine, aqueous ammonia, hydroquinone, tea polyphenol, sodium citrate, sodium borohydride, glucose, fructose or sucrose and the mass ratio of chemical reducing agent to graphene oxide is 1:1 to 50:1, heating reaction condition is 50-95 degrees C/1-48 hours; (iv) freeze-molding chemically reducing graphene oxide/carbon nano-tube hydrogels and freeze-drying chemically reduced graphene oxide/carbon nanotube aerogel, where the freezing molding conditions are -196 degrees C to -5 degrees C/0.5-24 hours and freeze-drying conditions are -40 degrees C to -80 degrees C/1.3-13 Pa/12-48 hours; (v) placing the chemically reduced graphene oxide/carbon nano-tube aerogel in an inert atmosphere, to obtain three-dimensional continuous graphene/carbon nanotube network skeleton by thermal reduction, where the inert atmosphere used is high purity nitrogen or argon and the thermal reduction condition is 500-1500 degrees C/1-6 hours; and (vi) immersing the graphene/carbon nanotube network skeleton into a low boiling point organic solvent solution of silicone rubber, carrying out vacuum-assisted removal of air bubbles and organic solvents, vulcanizing and molding to obtain the final product, where the low boiling organic solvent used is n-hexane, acetone, chloroform, dichloromethane or tetrahydrofuran, the concentration of the silicone rubber solution is 5-90 wt.% and the vulcanization process condition of the silicone rubber is 25-200 degrees C/10 minutes for 24 hours.