▎ 摘　　要

NOVELTY - Composite microwave absorbing material prepared by three-step reaction comprises multi-layer structure of nano-powder, where the graphene material is sheet, the interlayer is a nano magnetic particles, and loaded conductive high molecular polymer, the mass of the graphene material is 40-55%, the mass of the nano magnetic particle is 20-30%, the mass of the conductive high molecular polymer is 20-40%. USE - Used as composite microwave absorbing material prepared by three-step reaction. ADVANTAGE - The material solves the problem that the narrow band of traditional single component displayed in the microwave absorbing, poor impedance matching, the reflection loss of electromagnetic wave is bad. The method not only provides a new method of preparing composite microwave absorbing material, while providing a new microwave absorbing material research idea to increase the specific surface area of the material as possible such that electromagnetic opportunity can be reflected and refracted for many times. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for preparing composite microwave absorbing material comprising (i) adopting hydrothermal method to prepare graphene material, (ii) preparing mixed solution of ethanol and deionized water, adding graphene material ultrasonic stirring, (iii) mixing the iron, nickel or cobalt salt are dissolving in the de-ionized water, (iv) mixing the two kinds of solution, stirring reaction at less than 100 degrees C oil bath for 30-60 minutes, (v) transferring into the hydrothermal reaction kettle, injecting the concentrated aqueous ammonia to make the Ph is 10, sealing the kettle, placing in oven to react for 3-5 hours, naturally cooling to room temperature, opening the kettle, washing for multiple times, drying to obtain nano-magnetic particles loaded graphene-materials, and (vi) adding the conductive high polymer monomer and equal molar quantity of salicylic acid under the ultrasonic into the de-ionized water, adding the synthetic mixture, continuously ultrasonic stirring, mixing the solution transferring to the culture dish, adding ammonium persulfate aqueous solution, lower allowing to stand reaction at room temperature for 15-20 hours, adding the de-ionized water to wash for multiple times, obtaining the graphene material layer, where the interlayer is nano magnetic particles and load conductive macromolecule polymer composite microwave absorbing material, the mass of the graphene material in the mixture is 40-55%, the mass of the nano magnetic particle is 20-30%, the mass of the conductive high molecular polymer is 20-40%.