PBT composite material with high electromagnetic shielding efficiency and preparation method thereof

Abstract

The application discloses a PBT composite material with high electromagnetic shielding efficiency and a preparation method thereof, and belongs to the technical field of functional polymer composite materials. The PBT composite material is prepared from the following raw materials in parts by weight: PBT resin 50-90 parts; chopped carbon fibers 10-30 parts; composite conductive filler 10-20 parts; toughening agent 1-10 parts; antioxidant 0.2-0.5 parts; lubricant 0.2-0.5 parts. The composite material prepared by the application has excellent shielding efficiency and low reflectivity. The conductive-magnetic hybrid network formed by the composite filler, carbon nanotube-graphene nanosheet-ferroferric oxide, realizes the synergistic enhancement of dielectric loss and magnetic loss. In the frequency range of 1-18 GHz, the electromagnetic shielding efficiency of the composite material can reach 60-75 dB, which is much higher than the 50 dB level reported in the prior art; the electromagnetic wave reflectivity is lower than 25%, effectively reducing secondary electromagnetic pollution.

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