▎ 摘　　要

NOVELTY - Preparing composite absorbing material involves preparing graphene by adding single-walled carbon nanotubes to 400 milliliter concentrated sulfuric acid, standing for 24 hours, and then adding 10.0 gram potassium permanganate, stirring at room temperature for 1 hours, then sonicating at 55 degrees C for 30 minutes, adjusting the temperature to 70 degrees C and continuing sonication for 30 min, cooling to room temperature, pouring into 1.5 liter ice water, adding 200 milliliter peroxide, let stand for 24 hours and removing supernatant. The precipitate is centrifuged and dried under vacuum at 50 degrees C to obtain graphene oxide, added graphene oxide to a small amount of deionized water, after sonication for 30 minutes, added 300 milliliter ammonia water, 300 milliliter hydrazine hydrate, refluxed under reflux conditions, heated in a water bath to 95 degrees C for 1 hours, then changed the distillation unit and distilled off most of the ammonia water. USE - Method for preparing composite absorbing material. ADVANTAGE - The method enables prepare composite absorbing material which has good conductivity, magnetic property and stability, and has important application value in microwave absorption, and electro magnetic shielding field. DETAILED DESCRIPTION - The material is centrifuged, dried under vacuum at 50 degrees C, and ground to obtain a graphene. The preparation of cobalt ferrite involves weighing 4.0 gram Co(NO3)2 6H2O, 11.30 gram iron nitrate nonahydrate, dissolved in deionized water, slowly poured into a solution containing 7.68 gram citric acid, and magnetically stirred for 10 minutes. The solution is adjusted to pH of 7 with ammonia water, and then a solution in which 2.0 gram polyethylene glycol is dissolved slowly. The electromagnetic stirring is carried out for 2 hours, and after aged for 12 hours at room temperature. The water bath is continuously stirred for 3 hours at 80 degrees C to form a sol, heated and perfomed dehydration. The gel, after self-propagating combustion, is ground and calcined at 450 degrees C for 2 hours, and then calcined at 850 degrees C for 2 hours, cooled, and ground to obtain desired product. The preparation of composite absorbing materials involves adding Xg amount of graphene, Yg amount of cobalt ferrite to 20 milliliter 1mol/L hydrochloric acid solution, where X is 0.02-0.4 and Y is 0.02-0.4, after ultrasonic treatment for 1 hours, added Z milliliter aniline monomer, where Z is 0.50-0.90, stirring in ice water bath for 10 minutes, slowly stirring into 10 milliliter 1 mole per liter ammonium persulfate solution, stirring for 3 hours, perfoming suction filtration, filtering cake by washing with deionized water for 3-4 times, drying under vacuum for 10 hours to obtain graphene/cobalt ferrite/polyaniline composite absorbing material.