Lightweight conductive shielding composite material and preparation method thereof

Abstract

The invention discloses a light, conducting and shielding composite material and a preparation method thereof. The light, conducting and shielding composite material is composed of fluoroplastic, carbon nano tubes and hollow glass beads in a weight ratio of (20-60):(0.5-20):(0.5-40), wherein the fluoroplastic is foamed, and the carbon nano tubes are arranged in the fluoroplastic and are of a network structure. The preparation method of the light, conducting and shielding composite material comprises the following steps: firstly uniformly mixing the fluoroplastic, an etching phase, the carbon nano tubes and the hollow glass beads, so as to obtain a mixture; then mixing the mixture in a torque rheometer, so as to obtain a mixed material; and then carrying out hot pressing on the mixed material on a plate vulcanization machine, so as to obtain a composite board, then soaking the composite board in a solvent for removing the etching phase, and drying, so as to obtain the target product, namely the light, conducting and shielding composite material. The light, conducting and shielding composite material has the advantages of light weight, reliable electromagnetic shielding performance, good mechanical properties, simple technology, no pollution, low cost and applicability in large-scale industrial production, and can be easily and widely applied to electronic equipment and intensive systems in the fields of spaceflight, aviation, automobiles and the like.

Description

Technical field [0001] The invention relates to a conductive shielding composite material and a preparation method, in particular to a lightweight conductive shielding composite material and a preparation method thereof. Background technique [0002] Electromagnetic shielding materials are widely used in some electronic equipment and dense systems. Traditional electromagnetic shielding materials are generally made of metal. Although their shielding effect is good, they also have the defects of heavy quality, easy corrosion, and poor processing performance; it is difficult to apply them in aerospace, aviation, automotive and other fields. Recently, people have made some beneficial attempts and efforts in order to obtain lightweight electromagnetic shielding materials. For example, the Chinese Patent Application Publication CN 1656574A published on August 17, 2005 a conductive polymer foam and elastomer and its Production method. The conductive polymer foam described in the publi...

AI Technical Summary

Problems solved by technology

However, no matter the product or its manufacturing method, there are deficiencies. First, the carbon nanotubes in the polymer foam are easy to agglomerate, so it is extremely difficult to distribute evenly in the foam, thereby affecting the conductivity of the product. It especially affects the electromagnetic shielding performance of the product; secondly, the product formed due to foaming not only easily makes the carbon nanotubes in it further agglomerate during foaming, but also makes the mechanical properties of the product worse, which affects its application. Thirdly, the manufacturing method can neither obtain products with reliable electromagnetic shielding performance and good mechanical properties, but also requires surfactants, catalysts, foaming agents, curing agents and other raw materials, which are easy to pollute the environment

Images