An electromagnetic wave shielding/absorbing composite patch and its preparation method

An electromagnetic wave and patch technology, applied in the field of electromagnetic wave shielding/absorbing composite patch and its preparation, can solve the problems such as the inability to fundamentally eliminate electromagnetic waves, the limitation of the use of shielding patch materials, and the short circuit of the shielding patch, so as to improve the shielding performance , Excellent thermal conductivity, the effect of avoiding short circuit

Active Publication Date: 2020-07-07
HENGDIAN GRP DMEGC MAGNETICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the shielding patch is not the most ideal material, mainly because it cannot fundamentally eliminate electromagnetic waves. Although it can avoid the leakage of electromagnetic clutter, the reflected electromagnetic noise may cause interference to the radiation source itself
In addition, there is a risk of short circuit during the use of highly conductive shielding patches
Therefore, the use of shielding patch materials is greatly limited

Method used

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  • An electromagnetic wave shielding/absorbing composite patch and its preparation method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] A method for preparing an electromagnetic wave shielding / absorbing composite patch, comprising the following steps:

[0034] 1) Preparation of wave-absorbing layer: by weight percentage, 10% of polymer binder, 89% of scaly magnetic powder, and 1% of auxiliary materials are mixed evenly to obtain a mixture;

[0035] 2) the mixture in step 1) is made into a sheet-shaped material through a calendering process;

[0036] 3) vulcanize the flake-shaped material prepared in step 2), and the obtained patch is the wave-absorbing layer;

[0037] 4) Preparation of the shielding layer: by weight percentage, 65% of the binder system, 33% of the conductive absorbent, and 2% of the auxiliary agent are mixed, and then a uniform shielding coating is obtained;

[0038] 5) Composite of the wave-absorbing layer and the shielding layer: the shielding coating is coated on the surface of the wave-absorbing layer by a spraying process, and finally the coating is dried and cured to obtain a com...

Embodiment 2

[0055] 1) Preparation of wave-absorbing layer: by weight percentage, polymer binder 9.2%, scaly magnetic powder 90%, and auxiliary materials 0.8%, were mixed evenly to obtain a mixture;

[0056] 2) The mixture in step 1) is made into a sheet-shaped material through a casting process;

[0057] 3) vulcanize the flake-shaped material prepared in step 2), and the obtained patch is the wave-absorbing layer;

[0058] 4) Preparation of the shielding layer: by weight percentage, 55% of the binder system, 42% of the conductive absorbent, and 3% of the auxiliary agent are mixed, and then a uniform shielding coating is obtained;

[0059] 5) Composite of the wave-absorbing layer and the shielding layer: the shielding coating is coated on the surface of the wave-absorbing layer by a spraying process, and finally the coating is dried and cured to obtain a composite patch;

[0060] 6) Preparation of protective layer: The surface of the shielding layer in the composite patch prepared in step...

Embodiment 3

[0076] 1) Preparation of wave-absorbing layer: by weight percentage, 19.5% of polymer binder, 80% of scaly magnetic powder, and 0.5% of auxiliary materials are mixed uniformly to obtain a mixture;

[0077] 2) the mixture in step 1) is made into a sheet-shaped material through a calendering process;

[0078] 3) vulcanize the flake-shaped material prepared in step 2), and the obtained patch is the wave-absorbing layer;

[0079] 4) Preparation of the shielding layer: by weight percentage, 75% of the binder system, 20% of the conductive absorbent, and 5% of the auxiliary agent are mixed, and then a uniform shielding coating is obtained;

[0080] 5) Composite of the wave-absorbing layer and the shielding layer: the shielding coating is coated on the surface of the wave-absorbing layer by a spraying process, and finally the coating is dried and cured to obtain a composite patch;

[0081] 6) Preparation of protective layer: The surface of the shielding layer in the composite patch p...

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Abstract

The invention discloses a preparation method of an electromagnetic wave shielding / absorbing composite patch. The preparation method comprises the following steps: step 1), preparing a wave-absorbed layer; step 2), manufacturing a mixture obtained in step 1) into a sheet material through a tape casting or calendering process; step 3), carrying out vulcanization treatment on the sheet material prepared in step 2), wherein the obtained patch is the wave-absorbed layer; step 4), preparing a shielding layer; and step 5), compounding the wave-absorbed layer with the shielding layer: coating paint onthe surface of the wave-absorbed layer by adopting a spraying technology, drying and solidifying the coating, carrying out oil polish treatment on the shielding layer, and finally obtaining the composite patch. The preparation method of the electromagnetic wave shielding / absorbing composite patch provided by the invention can suppress electromagnetic radiation more effectively, and the absorbingproperty of the composite patch can be improved, thus the short circuit phenomenon can be avoided, and more electromagnetic noises can be eliminated thoroughly.

Description

technical field [0001] The invention belongs to the field of composite wave-absorbing material manufacturing, and in particular relates to an electromagnetic wave shielding / absorbing composite patch and a preparation method thereof. Background technique [0002] The wave-absorbing patch material is a flexible thin-sheet material composed of a polymer binder and a phosphorus flake magnetic powder absorber. It has a good absorption function for electromagnetic waves and is widely used to solve the problem of electromagnetic waves in electronic products. Interference and electromagnetic radiation issues. [0003] When electromagnetic clutter enters the interior of the wave-absorbing patch, the movement of the magnetic domain wall and the rotation of the magnetic moment will occur inside the magnetic absorbent, thereby absorbing the electromagnetic wave. Therefore, the wave-absorbing patch inhibits electromagnetic radiation mainly by absorbing electromagnetic waves. This kind ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H05K9/00C09D163/00C09D183/04C09D133/04C09D5/24
CPCC08K2003/0812C09D5/24C09D163/00C09D183/04H05K9/0088C08L33/04C08K3/08
Inventor 刘立东叶怡婷郝斌陈浩徐君
Owner HENGDIAN GRP DMEGC MAGNETICS CO LTD
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