▎ 摘　　要

NOVELTY - Method for preparing injection bonded composite material, involves (i) adding soft ferrite powder, nano-ceramic, nano-graphene, copper powder, conductive material, bonding resin and flame retardant, stirring, (ii) calcining resulting mixture, (iii) adding curing agent and accelerator to pre-calcined mixture, stirring, (iv) extruding, granulating, (v) immersing the molding material in a polyurethane binder solution, taking out, (vi) filling spray gun with ultrafine metal powder, evenly spraying on surface of adhesive-treated molding material, and air-curing. USE - Method for preparing injection bonded composite material for absorbing radio frequency electromagnetic waves. ADVANTAGE - The method enables simple preparation of wave absorbing composite material with excellent heat resistance, wide wave-absorbing range, and high-performance absorption efficiency for radio frequency electromagnetic waves. DETAILED DESCRIPTION - The method for preparing injection bonded composite material for absorbing radio frequency electromagnetic waves, involves (i) adding 60-80 pts. wt. soft ferrite powder, 10-20 pts. wt. nano-ceramic, 5-10 pts. wt. nano-graphene, 10-20 pts. wt. copper powder, 10-20 pts. wt. conductive material, 90-110 pts. wt. bonding resin and 20-30 pts. wt. flame retardant into a stirred tank, stirring at 400-500 rpm for 20-40 minutes, (ii) placing resulting mixture in a calciner, calcining at 50-80 degrees C for 2-3 hours, (iii) adding 5-10 pts. wt. curing agent and 3-5 pts. wt. accelerator to the pre-calcined mixture, stirring at 300-400 rpm for 10-20 minutes, (iv) placing the mixture obtained in step (iii) in a twin-screw extruder, and carrying out extrusion granulation at 200 degrees C at a speed of 300 rpm where the twin-screw extruder has region (I) temperature of 190 degrees C, region (II) temperature of 210 degrees C, region (III) temperature of 230 degrees C, region (IV) temperature of 200 degrees C and region (V) temperature of 190 degrees C, (v) immersing the molding material in a polyurethane binder solution, taking out, (vi) filling spray gun with ultrafine metal powder, evenly spraying on surface of adhesive-treated molding material from four directions of up, down, left and right, and air-curing to obtain injection-bonded composite material that absorb radio frequency electromagnetic waves.