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Metal fiber/polymer compound electromagnetic shielding material and its making method

A metal fiber and shielding material technology, applied in the direction of magnetic/electric field shielding, electrical components, etc., can solve the problems of low shielding effectiveness, complicated manufacturing process and technology, and difficult to control, and achieve high shielding effectiveness, easy control, and easy operation. Effect

Inactive Publication Date: 2008-02-13
UNIV OF SCI & TECH BEIJING +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

From the current results, it can be seen that this kind of research can only produce conductive plastic anti-static products, and its shielding effectiveness is still relatively low, and the production process and technology are relatively complicated and difficult to control.
There is no report on the use of metal fibers as conductive fillers combined with conductive polymers to prepare composite electromagnetic shielding coatings

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0010] Embodiment 1: select austenitic (304) stainless steel fibers with a diameter of 12 microns, and manually cut them into short fibers of about 1 mm. The conductive polyaniline double-doped with DBSA is selected, its surface resistance is 2 ohms, and the basic components of the electromagnetic shielding coating are formed with the acrylic resin matrix. 10% by weight of stainless steel fibers, 4% by weight of conductive polyaniline and 86% by weight of acrylic resin were mechanically mixed, and placed in a ball mill for 1 hour to make an electromagnetic shielding coating. The shielding paint was coated on a resin substrate having a diameter of 115 mm for testing shielding effectiveness. The thickness of the coating is 0.4 mm. After testing, the shielding effectiveness of the sample reaches above 45dB in the frequency range of 30MHz-1500MHz.

Embodiment 2

[0011] Embodiment 2: Select ferrite (430) stainless steel fibers with a diameter of 11 microns, and manually cut them into short fibers of about 0.6 mm. The conductive polyaniline double-doped with DBSA is selected, its surface resistance is 2 ohms, and the basic components of the electromagnetic shielding coating are formed with the acrylic resin matrix. The stainless steel fiber with a weight fraction of 10%, the conductive polyaniline with a weight fraction of 4%, and the acrylic resin with a weight fraction of 86% were mechanically mixed, and placed in a ball mill for 15 minutes to make an electromagnetic shielding coating. The shielding paint was coated on a resin substrate having a diameter of 115 mm for testing shielding effectiveness. The thickness of the coating is 0.4 mm. After testing, the shielding effectiveness of the sample reaches above 40dB in the frequency range of 30MHz-1500MHz.

Embodiment 3

[0012] Embodiment 3: select ferrite (430) stainless steel fibers with a diameter of 11 microns, and manually cut them into short fibers of about 0.6 mm. The conductive polyaniline double-doped with DBSA is selected, its surface resistance is 2 ohms, and the basic components of the electromagnetic shielding coating are formed with the acrylic resin matrix. The stainless steel fiber with a weight fraction of 25%, the conductive polyaniline with a weight fraction of 5%, and the acrylic resin with a weight fraction of 70% were mechanically mixed, and placed in a ball mill for 2 hours to make an electromagnetic shielding coating. The shielding paint was coated on a resin substrate having a diameter of 115 mm for testing shielding effectiveness. The thickness of the coating is 0.4 mm. After testing, the shielding effectiveness of the sample reaches above 60dB in the frequency range of 30MHz-1500MHz.

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Abstract

A metal fibre / polymer composite electromagnetic shielding material and the preparation method of the material relates to a functional composite material of shielding the interfering of electromagnetic wave. The invention consists of electromagnetic shielding components that are compositely formed by metal fibre and conducting polymer and a resin matrix. The preparation method includes the cutting of the metal fibre and acquiring the electromagnetic shielding material through ball milling by mixing the metal fibre with the conducting polymer and the resin mechanically. As the invention makes use of the metal fibre as the metal jointing to replace metal powder and the metal fibre has a certain slenderness ratio which is more beneficial to forming a conducting network, the invention plays a remarkable role on reducing cost as well as the weight of the electromagnetic shielding material. The composition of the metal fibre and polymer increases the bandwidth of shielding efficiency and can acquire a higher shielding efficiency in a wider frequency range. Adopting different metal fibre assemblies or alloy fibre can design the electromagnetic performances of the metal fibre conducting network .and increase the absorption loss in shielding efficiency thereby reducing the secondary pollution caused by reflection. The method has the advantages of easy preparation and operation.

Description

technical field [0001] The invention relates to an electromagnetic shielding functional composite material, which is used for shielding electromagnetic wave interference. Background technique [0002] With the advancement of electronic technology and electronic equipment, the harm of electromagnetic waves to the normal use of electronic equipment and human health needs to be controlled. Electromagnetic shielding materials are an important means to effectively control the hazards of electromagnetic waves and shield electromagnetic interference. The composite electromagnetic shielding coatings researched and developed at present all use spherical metal powder as the main conductive coating. The Chinese Patent 03121536.X "Organic / Inorganic Composite Electromagnetic Wave Absorber Shielding Coating Material" published on September 10, 2003 reports a composition mode of an organic / inorganic composite electromagnetic wave absorbing and shielding coating. On March 23, 2005, the Ch...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05K9/00C08L101/12C08K7/06
Inventor 朱国辉毛卫民王俊冯惠平
Owner UNIV OF SCI & TECH BEIJING
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