▎ 摘　　要

NOVELTY - Hollow thin-walled tubular bead foamed polymer wave-absorbing material comprises 25-70 wt.% polypropylene, 25-70 wt.% water-soluble polymer, 5-20 wt.% electromagnetic wave absorbent and 5-35 wt.% other auxiliary agent. USE - Used as hollow thin-walled tubular bead foamed polymer wave-absorbing material. ADVANTAGE - The wave-absorbing material: can actively increases the number of reflection and absorption of electromagnetic waves, thus greatly improving its functionality, better meeting customer needs, and achievs more lightweight material design, which is convenient for the use of absorbing material. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for preparing the hollow thin-walled tubular bead foamed polymer wave-absorbing material comprising (i) quantitatively adding polypropylene, electromagnetic wave absorbent and other auxiliary agent into the screw extruder as extruded outer layer, and selecting water-soluble polymer for inner layer; (ii) cutting the strands into particles by pelletizer after being processed in step (i); (iii) adding the above-mentioned particles into the foaming reaction kettle, dispersion medium in reaction kettle will disperse the particles, setting a certain temperature and gas pressure, dissolving water-soluble polymers in water in the gas saturation stage particles, remaining outer polypropylene layer has thin-walled tubular structure, when foaming temperature and pressure reach the set value, opening the valve of the reaction kettle to instantly release the pressure, and obtaining a hollow thin-walled tubular expanded polypropylene bead with a controllable magnification; and (iv) using the hollow thin-walled tubular expanded polypropylene obtained in step (iii) as molding raw material, and forming the electromagnetic wave foam absorber of desired structure.