▎ 摘　　要

NOVELTY - Composite porous absorbing material comprises 5-30 wt.% graphene, 5-20 wt.% magnetic particles, 45-90 wt.% polyaniline, and 1-5 wt.% foaming agent, where a solvent thermal method is adopted to load the magnetic particles on the graphene sheet surface, which is followed by loading polyaniline to the graphene sheet withmagnetic particles by in-situ polymerization, adding foaming agent along with heating, and performing high temperature carbonization to obtain the composite porous absorbing material. USE - Composite porous absorbing material. ADVANTAGE - The composite porous absorbing material has low cost, simple preparation process, strong electromagnetic wave absorbing performance, and wide absorbing frequency band, and has wide application prospect in sensing technology, electromagnetic shielding, and radar absorbing wave field. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a method for preparing composite porous absorbing material, which involves: (A) adding multi-wall carbon nano-tube with a particle diameter of 30-50nm into concentrated sulfuric acid, placing for 18-24 hours, adding potassium permanganate, stirring for 1 hour at room temperature, subjecting to ultrasonic treatment at a temperature of 50-60 degrees C for 0.5-1 hour, continuing ultrasonic processing along with heating to a temperature of 70-80 degrees C for 0.5-1 hours, cooling to room temperature, pouring into 1.0-1.5L ice water, adding hydrogen peroxide, placing for 18-24 hours, centrifuging the precipitate, vacuum drying to obtain graphene oxide, adding little amount of de-ionized water to graphene oxide, processing ultrasonically for 0.5-1 hour after adding ammonia and hydrazine hydrate, subjecting the graphene and magnetic particle to reflux condensation in a water bath by heating to a temperature of 80-95 degrees C for 1-3 hours, separating centrifugally, vacuum drying, and grinding to obtain graphene; (B) weighing the obtained graphene according to the mass percentage, dissolving in proper amount of distilled water, dispersing ultrasonically for 0.5-1 hour until complete dissolution, adding 10mol/L sodium hydroxide solution under the magnetic force stirring till the pH value is more than 8, placing and layering for removing upper clear, treating the rest part into a reaction kettle at a temperature of 50-70 degrees C for 10-12 hours, performing cooling and filtering, washing the filter cake to a neutral pH, and vacuum drying to obtain graphene/magnetic particle nano composite material; (C) weighing the obtained graphene/magnetic particle nano composite material, aniline monomer to form a mixed solution, adding the mixed solution in a three-mouth flask filled with 0.1mol/L hydrochloric acid solution, dispersing ultrasonically for 0.5-1 hour, dissolving ammonium persulfate in 0.1mol/L hydrochloric acid solution to form a mixture, using drop funnel for slowly dripping the mixture to the mixed solution, stirring and reacting continuously for 10-12 hours, filtering, washing the product until the filtrate is colorless, and drying for 20-24 hours in vacuum to obtain graphene/magnetic particle/polyaniline nano-composite material; and (D) mixing the obtained graphene/magnetic particle/polyaniline nano-composite material uniformly with the foaming agent, subjecting to heating and foaming, and carbonizing at high temperature to obtain the composite porous absorbing material.