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Low-reflectivity high-efficiency electromagnetic shielding material

An electromagnetic shielding material and low-reflection technology, applied in radiation-absorbing coatings, conductive coatings, coatings, etc., to achieve low secondary pollution, pollution-free production technology, and strong applicability

Inactive Publication Date: 2014-09-03
无锡水木清华国珍科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to overcome the disadvantages of using a single conductive filler in the prior art that it is difficult to obtain broadband and high-efficiency shielding effectiveness, and to provide a low-reflection and high-efficiency electromagnetic shielding material. The present invention is environmentally friendly with low reflection (low secondary pollution) With the goal of high-efficiency electromagnetic shielding materials, it is proposed to use the composite effect between materials with different electromagnetic properties, the reflection of electromagnetic waves by metal powder materials with high conductivity, the eddy current attenuation of electromagnetic waves by ferromagnetic materials with high magnetic permeability and polymer The dielectric loss of the dielectric material to the electromagnetic wave realizes the efficient electromagnetic shielding of the electromagnetic wave

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] In this embodiment, metal nickel powder is selected as the metal powder with relative conductivity ≥ 0.02, iron-cobalt alloy powder is selected as ferromagnetic material powder with relative magnetic permeability ≥ 1, and conductive polyaniline powder is selected as the polymer dielectric material. Metal nickel powder with a diameter of 2 microns, iron-cobalt alloy powder with a diameter of 3 microns and conductive polyaniline powder with a diameter of 2 microns are selected. According to the volume ratio of the metal nickel powder to the composite electromagnetic shielding component, the iron-cobalt alloy powder accounts for The volume ratio of the components is 17%, and the volume ratio of the conductive polyaniline to the composite electromagnetic shielding component is 13%. After the above powders are mixed in proportion, they are dispersed for 20 minutes with an ultrasonic disperser to obtain a uniform composite electromagnetic shielding component. Add acrylic resi...

Embodiment 2

[0024] In this embodiment, the metal powder with a relative conductivity ≥ 0.02 is selected from stainless steel powder, the ferromagnetic material powder with a relative magnetic permeability ≥ 1 is selected from iron-nickel powder, and the polymer dielectric material is selected from conductive polyaniline powder. Stainless steel powder with a diameter of 10 microns, iron-nickel powder with a diameter of 8 microns and conductive polyaniline powder doped with hydrochloric acid of 25 microns are selected. According to the volume ratio of stainless steel powder to the composite electromagnetic shielding component, the iron-nickel powder accounts for The volume ratio of the shielding component is 8.5%, and the proportion of polyaniline powder in the volume ratio of the composite electromagnetic shielding component is 8.5%. After the above powders are mixed in proportion, they are dispersed for 20 minutes with an ultrasonic disperser to obtain a uniform composite electromagnetic s...

Embodiment 3

[0026]In this embodiment, silver-coated copper powder is selected as the metal powder with a relative conductivity ≥ 0.02, iron-zinc powder is selected as the ferromagnetic material powder with a relative magnetic permeability ≥ 1, and conductive polyaniline powder is selected as the polymer dielectric material. Silver-coated copper powder with a diameter of 20 microns, iron-zinc powder with a diameter of 20 microns and conductive polyaniline powder doped with camphorsulfonic acid of 50 microns are selected. According to the volume ratio of the silver-coated copper powder to the composite electromagnetic shielding component is 70%, The iron-zinc powder accounts for 29% of the volume ratio of the composite electromagnetic shielding component and the polyaniline powder accounts for 1% of the volume ratio of the composite electromagnetic shielding component for compounding. After the above powders are mixed in proportion, they are dispersed for 20 minutes with an ultrasonic disper...

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Abstract

The invention discloses a low-reflection and high-efficiency electromagnetic shielding material, which belongs to the technical field of electromagnetic shielding materials. The invention includes a composite electromagnetic shielding component composed of materials with different electromagnetic properties, the composite electromagnetic shielding component is composed of metal powder with relative conductivity ≥ 0.02, ferromagnetic material powder with relative magnetic permeability ≥ 1 and polymer dielectric material Composition, wherein the volume ratio of metal powder is between 70% and 97%, the volume ratio of ferromagnetic material powder is between 1% and 29%, and the volume ratio of polymer dielectric material is between 1% and 29%. On the basis of ensuring high-efficiency electromagnetic shielding through the compound effect, the present invention reduces the reflection of electromagnetic waves and increases the absorption of electromagnetic waves, so as to achieve the goal of reducing secondary pollution. According to the national military standard GJB6190-2008 of the People's Republic of China, the In the electromagnetic wave frequency range, the shielding effectiveness reaches above 60dB (Class B).

Description

technical field [0001] The invention belongs to the technical field of electromagnetic shielding materials, in particular to functional composite materials used for electromagnetic radiation environment treatment. Background technique [0002] With the extensive use of electronic equipment, electromagnetic radiation is caused. The space pollution caused by this radiation has caused great harm to the safe and correct operation of electronic equipment and people's health. Therefore, the control of electromagnetic radiation is becoming increasingly important. Electromagnetic shielding materials are an important means to effectively control the hazards of electromagnetic waves and shield electromagnetic interference. [0003] The traditional electromagnetic shielding method is to use metal plates, but metal plates have inherent shortcomings such as heavy weight, difficult installation and sealing, which limit its application. At the same time, because the electromagnetic shield...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D7/12C09D5/00C09D5/24C09D5/32C09D133/00
Inventor 朱国辉
Owner 无锡水木清华国珍科技有限公司
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