▎ 摘　　要

NOVELTY - Preparing conductive rubber-based composite electromagnetic shielding material involves preparing a water dispersion of a blend of 0.01-0.1 wt.% nanocellulose and 0.1-1 wt.% graphene oxide, mixing blended water dispersion with a rubber solution having a mass concentration of 0.5-7% by a volume ratio of 1-10:1, and then ultrasonically emulsifying for 0.5-30 minutes at an ultrasonic wave of 100-1000 Watt. An oil-in-water pickering emulsion which is stabilized by nanocellulose and graphene oxide is obtained, and after standing for 12-24 hours, an emulsion gel is obtained;. The rubber solution is a solution in which the rubber is dissolved in an organic solvent. The emulsion gel obtained is subjected to suction filtration, and washed with a mixed solution of an organic solvent and ethanol used in the rubber solution for 4-6 times to obtain nanocellulose/graphene oxide/rubber filter cake. USE - Method for preparing conductive rubber-based composite electromagnetic shielding material. ADVANTAGE - The method enabels to prepare conductive rubber-based composite electromagnetic shielding material, which has simple preparation process and easy availability of raw materials, light in weight, small in thickness, good in flexibility, has good electrical conductivity, satisfies the requirements of the civil electromagnetic shielding material in the X-band, and has good in civil electromagnetic shielding material application prospects. DETAILED DESCRIPTION - Preparing conductive rubber-based composite electromagnetic shielding material involves preparing a water dispersion of a blend of 0.01-0.1 wt.% nanocellulose and 0.1-1 wt.% graphene oxide, mixing blended water dispersion with a rubber solution having a mass concentration of 0.5-7% by a volume ratio of 1-10:1, and then ultrasonically emulsifying for 0.5-30 minutes at an ultrasonic wave of 100-1000 Watt. An oil-in-water pickering emulsion which is stabilized by nanocellulose and graphene oxide is obtained, and after standing for 12-24 hours, an emulsion gel is obtained;. The rubber solution is a solution in which the rubber is dissolved in an organic solvent. The emulsion gel obtained is subjected to suction filtration, and washed with a mixed solution of an organic solvent and ethanol used in the rubber solution for 4-6 times to obtain nanocellulose/graphene oxide/rubber filter cake. A hydrazine hydrate solution having a mass concentration of 1-20% is prepared. The filter cake obtained is immersed in the hydrazine hydrate solution prepared, reacted at 60-100 degrees C for 0.5-3 hours. The filter cake is then placed in a hot press mold in an oven at 60-100 degrees C to continue the reaction and baked to a semi-dry state. The semi-dry state filter cake obtained is placed in a flat hot press for hot pressing to obtain a nanocellulose/reduced graphene oxide/rubber flexible composite electromagnetic shielding film, which is a conductive rubber base composite electromagnetic shielding material. The nanocellulose is a cellulosic material having a size in the nanometer range of at least one dimension, comprising a cellulose nanocrystal and a cellulose nanofiber having a morphology structure prepared by extracting from a raw material, where the raw material is cotton, wood, bamboo or Hemp, the graphene oxide is a monolithic structure, the sheet thickness is 0.8-1.2 nanometer. The rubber is an unvulcanized raw rubber or plastic rubber, specifically natural rubber, styrene butadiene rubber, butadiene rubber, butyl rubber, neoprene rubber or nitrile rubber. The organic solvent is dichloromethane, 1,2-dichloroethane, chloroform, n-hexane or cyclohexane. The hot pressing process adopts a two-step method, where the hot pressing is carried out for 5-15 minutes under the condition of 80 degrees C and a pressure of 0.5 mega Pascals (MPa) to further remove the organic solvent in the filter cake, hot-pressed at 150 degrees C and a pressure of 12 MPa for 15-60 minutes. The purity of the chemical reagent and the raw materials are both analytical purity and above purity.