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Composite electromagnetic shielding material and preparation method thereof

A shielding material and composite electromagnetic technology, which is applied in the fields of magnetic field/electric field shielding, chemical instruments and methods, electrical components, etc., can solve problems such as limited application range, reduced strength and modulus, and reduced aspect ratio of CNT, reaching the selection range Wide range, good applicability, and cost-saving effect

Active Publication Date: 2009-04-15
TSINGHUA UNIV +1
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  • Abstract
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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

Method used

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  • Composite electromagnetic shielding material and preparation method thereof
  • Composite electromagnetic shielding material and preparation method thereof
  • Composite electromagnetic shielding material and preparation method thereof

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preparation example Construction

[0014] Please refer to figure 1 , the preparation method of the composite electromagnetic shielding material of the technical solution comprises the following steps:

[0015] (1) Provide a carbon nanotube array.

[0016] In this embodiment, the carbon nanotube array is a super-arranged carbon nanotube array, and the preparation method of the super-arranged carbon nanotube array adopts a chemical vapor deposition method, and the specific steps include: providing a flat substrate, the substrate Can select P-type or N-type silicon substrate, or select the silicon substrate that has formed oxide layer for selection, present embodiment preferably adopts the silicon substrate of 4 inches; Form a catalyst layer uniformly on the substrate surface, this catalyst layer material can be selected iron (Fe ), cobalt (Co), nickel (Ni) or an alloy of any combination thereof; annealing the above-mentioned substrate formed with a catalyst layer in air at 700-900° C. for about 30 minutes to 90 ...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05K9/00B32B9/00B32B37/00B32B38/08
Inventor 林承贤白耀文李文钦张睿姜开利冯辰
Owner TSINGHUA UNIV
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