Composite electromagnetic shielding material and preparation method thereof

Abstract

The invention provides a composite electromagnetic shielding material, comprising a polymer and a plurality of carbon nano-tubes; wherein, a plurality of carbon nano-tubes are arranged in the polymer in the form of carbon nano-tube film. A preparation method used for preparing the composite electromagnetic shielding material comprises the steps as follows: a carbon nano-tube array is provided; atleast a carbon nano-tube film is gained by the pulling in the carbon nano-tube array by a tensile tool; a substrate is provided; at least a carbon nano-tube film is attached to the substrate, thus forming the carbon carbon-tube film structure and removing the residual carbon nano-tube film structure out of the substrate; the carbon nano-tube film structure is composed with the polymer, thus gaining the composite electromagnetic shielding material.

Description

technical field [0001] The invention relates to an electromagnetic shielding material and a preparation method thereof, in particular to a composite electromagnetic shielding material and a preparation method thereof. Background technique [0002] With the rapid development of information technology, the resulting harm of electromagnetic interference, electromagnetic leakage and electromagnetic radiation has attracted more and more attention from the society. For example, electromagnetic interference (EMI) can cause the civil aviation take-off and landing system to fail, poor communication, computer operation error, automatic control equipment misoperation, etc. Information leakage caused by electromagnetic wave radiation can affect the security of the national economy and national defense. Therefore, all countries are conducting research on electromagnetic shielding technology and new electromagnetic shielding materials. [0003] From the material point of view, metal mate...

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Problems solved by technology

However, this method of preparing composite materials by surface modification of CNTs has the following disadvantages: First, surface modification will increase the defects on the CNT tube wall while changing the properties of CNTs, and the aspect ratio of CNTs will decrease. The conductivity and other properties of CNT are damaged, and then the electromagnetic shielding performance of the composite material is affected; second, the surface modification method of CNT is only suitable for compounding CNT with a small amount of several polymers, which limits its application range; third, The surface modification of CNT has increased the production cost of composite material; Its 4th, the above-mentioned method for preparing composite material by modification, the content of the CNT that can compound in the polymer has certain limit, exceeds this limit, the composite material Other properties, such as strength and modulus, will be reduced

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