▎ 摘　　要

NOVELTY - Metal-loaded carbon/polymer-based electromagnetic shielding material is prepared by loading 5-8 wt.% nanosized cobalt ferrite nano-powder on 12-15 wt.% graphene micro-sheets (GNP), impregnating with 5-8 wt.% polyurethane (PU), melting and loading on required amount of polylactide (PLA), vacuum infiltration and filling 8-10 wt.% polybutylene adipate terephthalate (PBAT) to obtain electromagnetic shielding composite material. USE - Metal-loaded carbon/polymer-based electromagnetic shielding material. ADVANTAGE - The shielding material fills the cell defects, improves the electromagnetic shielding efficiency, improves the mechanical properties of the material through PU impregnation and PBAT penetration. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following: (1) a method for preparing the metal-supported carbon/polymer-based electromagnetic shielding material involving (i) preparing CoFe2O4 nano particle by mixing iron acetylacetonate and cobalt acetylacetonate in oleic acid amine, and continuously magnetically stirring for 1 hour at normal temperature to obtain homogeneous mixture, transferring the reddish homogeneous solution to 100 ml stainless steel autoclave lined with PTFE, and heating at 200 degrees C in an oven for 24 hours, after the reaction is complete, leaving the autoclave cool to normal temperature naturally, and collecting the final product with centrifuge at a speed of 5000 rpm for 10 minutes, (ii) preparing CoFe2O4/GNP by dissolving the CoFe2O4 nanoparticles produced in the step (i) in ethanol, ultrasonically dispersing, adding graphene microchips, stirring at normal temperature for 50-60 minutes, adding small amount of hydrogen fluoride, and transferring to a stainless steel autoclave lined with PTFE, heating at 220 degrees C in the oven for 24 hours, natural cooling, filtering, washing and drying, (iii) preparing CoFe2O4/PU-GNP by cutting the polyurethane foam into dimethylformamide/N-methyl-2-pyrrolidone solution, adding the CoFe2O4/GNP prepared in the step (ii) and ultrasonically immersing it for 3-4 hours, filtering, air-drying for 72 hours, and vacuum-drying at 50 degrees C for 4 hours, (iv) placing the dried CoFe2O4/PU-GNP and dried polylactide into an internal mixer, mixing for 10-20 minutes, and discharging, and (v) adding the composite material obtained in the step (iv) to PBAT and infiltrating under vacuum for 15-20 minutes, and solidifying for 3-4 hours to obtain electromagnetic shielding composite material.