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Flexible electromagnetic shielding material and its preparing process

A kind of electromagnetic shielding material and flexible technology, applied in the direction of magnetic/electric field shielding, shielding, electrical components, etc., can solve the problems of serious coating sedimentation, too thick shielding layer, poor control of process parameters, etc., and achieve lasting improvement and distribution uniform effect

Inactive Publication Date: 2003-09-03
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Shielding materials based on engineering plastics have the following disadvantages (taking coated composite shielding materials as an example): (1) The process parameters are not easy to control, resulting in uneven thickness and thickness; (2) The comprehensive shielding effectiveness (SE) is not ideal ; (3) The sedimentation of the paint is serious; (4) The oxidation problem of the copper-based shielding material has not been well resolved; (5) The shielding layer is too thick, L 平均 Greater than 60 microns; (6) Poor flexibility
The application of electroless nickel plating on fibers is only limited to the chemical power supply industry - the production of new fiber nickel electrodes
In addition, there are also reports about conductive fabrics blended with metal fibers and chemical fibers, but the overall shielding effect is not high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0034] Example 1. After the flexible material has established a plateable platform, wash it with water, immerse it in a copper precipitation solution with pH = 11-13, T = 25-45°C for 15-21 minutes of copper precipitation treatment, wash it with water, and immerse it in a copper precipitation solution with a pH = 4.5~ 6.3, T = 65 ~ 78 ℃ in nickel alloy solution for 10 ~ 22 minutes of nickel alloy treatment. The thickness of the prepared sample shielding layer is less than 1 micron, and the comprehensive shielding effectiveness is -58-67dB under 30M-1GHz plane electromagnetic waves.

example 2

[0035] Example 2. After the flexible material has established a plateable platform, wash it with water, immerse it in a copper precipitation solution with pH = 11-13, T = 25-45 ° C for 15-21 minutes of copper precipitation treatment, wash it with water, and immerse it in a pH = 4.5-6.3 , T = 65 ~ 78 ℃ in nickel alloy solution for 1.5 ~ 3.5 minutes of electroplating nickel alloy, nickel alloy mixed treatment. The electroplating nickel alloy treatment conditions are as follows: stainless steel as anode, flexible copper sinking material as cathode, and direct current or pulse current. Then immerse in the electroplating nickel alloy solution with pH=3.3-5.1 and T=35-52°C for 11-14 minutes of electroplating nickel alloy treatment. The thickness of the prepared sample shielding layer is less than 1 micron, and its comprehensive shielding effectiveness reaches -70~-80dB under 30M~1GHZ plane electromagnetic waves.

example 3

[0036] Example 3. After the flexible material has established a plateable platform, wash it with water, immerse it in a copper precipitation solution with pH=11~13, T=25~45°C for 15~21 minutes, wash it with water, and immerse it at pH=4.5~6.3 , T = 65 ~ 78 ℃ immersion nickel alloy liquid application for 18 ~ 22 minutes of electroplating nickel alloy, mixed treatment of immersion nickel alloy. The treatment conditions for electroplating nickel alloy are: stainless steel as anode, flexible copper sinking material as cathode, and direct current or pulse current. The thickness of the prepared sample shielding layer is less than 1 micron, and the comprehensive shielding effectiveness is -55-64dB under 30M-1GHz plane electromagnetic waves.

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Abstract

A flexible electromagnetic shielding material is made up through pre-treating in alkaline solution by ultrasonic waves, water washing, roughening in acidic roughening solution, acitivating in pre-treating solution and then in activating solution, reducing, copper depositing, electroplating Ni alloy, depositing Ni alloy, water washing, and treating in Ni-alloy electroplating solution. Its advantages include uniform shielding, small thickness less than 1 micron and high flexibility and durability.

Description

technical field [0001] The invention relates to a method for preparing a flexible electromagnetic shielding material, which belongs to the preparation technology of electromagnetic shielding materials. Background technique [0002] At present, the general electromagnetic shielding materials are composite materials composed of certain metals or alloys, and their base materials include metals and non-metals. The electromagnetic shielding materials based on non-metals mostly use engineering plastics (such as ABS plastics for microcomputer casings) as the base layer. This technology has been adopted in the field of Tempest to prevent electromagnetic signal leakage and anti-electromagnetic radiation. It can effectively improve the electromagnetic compatibility of electronic and electrical equipment to reduce radiation and strengthen information security. Shielding materials based on engineering plastics have the following disadvantages (taking coated composite shielding materia...

Claims

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Application Information

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IPC IPC(8): G12B17/02H05K9/00
Inventor 王群张晓宁周美玲毛倩瑾
Owner BEIJING UNIV OF TECH
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