Flexible electromagnetic shielding film material with bionic multilayer structure capable of being regulated into isolation structure and preparation method of flexible electromagnetic shielding film material

An electromagnetic shielding material and electromagnetic shielding film technology, applied in the direction of magnetic/electric field shielding, electrical components, etc., can solve the problems of secondary or multiple processing, electromagnetic shielding performance degradation, irreparable repair or recycling, etc., to improve electromagnetic shielding Effectiveness, high-efficiency electromagnetic shielding performance, and wide application range

Pending Publication Date: 2022-07-29
UNIV OF SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the biomimetic multilayer structure is stable, and once damaged, it is difficult to restore the original state, which leads to the failure of the material's performance.
The polymer matrix selected for common polymer electromagnetic shielding composite materials is thermoplastic polymer material, and the mixed system can be prepared by melting and banburying. Once the thermosetting polymer material with better dimensional stability and comprehensive performance is made into electro

Method used

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  • Flexible electromagnetic shielding film material with bionic multilayer structure capable of being regulated into isolation structure and preparation method of flexible electromagnetic shielding film material
  • Flexible electromagnetic shielding film material with bionic multilayer structure capable of being regulated into isolation structure and preparation method of flexible electromagnetic shielding film material
  • Flexible electromagnetic shielding film material with bionic multilayer structure capable of being regulated into isolation structure and preparation method of flexible electromagnetic shielding film material

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0034] Example 1:

[0035] The bionic structure-adjustable electromagnetic shielding film of this implementation is made of castor oil-based water-based polyurethane (see the preparation process in figure 1 ), solvent water and electromagnetic shielding filler as raw materials, the electromagnetic shielding film prepared by the method of vacuum filtration; specifically prepared according to the following steps:

[0036] Step 1: Use liquid-phase chemical etching to prepare titanium carbide nanosheets, ultrasonically disperse to prepare an aqueous dispersion of titanium carbide, and prepare a concentration of 1 wt% to obtain an electromagnetic shielding nanofiller dispersion for use; the mass of titanium carbide used is 0.02 g, 0.04 g and 0.06 g.

[0037] Step 2: prepare a responsive castor oil-based water-based polyurethane, dilute with deionized water to a concentration of 2 wt %, and obtain a polymer dispersion for use.

[0038] Step 3: Add the two raw material components o...

Example Embodiment

[0041] Example 2:

[0042] The biomimetic structure adjustable electromagnetic shielding film of this implementation is an electromagnetic shielding film prepared by vacuum filtration using castor oil-based water-based polyurethane, solvent water, and electromagnetic shielding filler as raw materials; the specific preparation is as follows:

[0043] Step 1: Use ultrasonic dispersion for 24 hours to prepare an aqueous dispersion of carbon nanotubes with a concentration of 1 wt% to obtain an electromagnetic shielding nanofiller dispersion for use; the mass usage of carbon nanotubes is 0.02g, 0.04g and 0.06g respectively.

[0044] Step 2: prepare a responsive castor oil-based water-based polyurethane, dilute with deionized water to a concentration of 2 wt %, and obtain a polymer dispersion for use.

[0045] Step 3: Add the two raw material components obtained in steps 1 and 2 into the vacuum suction filtration device alternately, and filter under vacuum conditions for 6 hours to ...

Example Embodiment

[0048] Example 3:

[0049] The bionic structure adjustable electromagnetic shielding film of this implementation is an electromagnetic shielding film prepared by the method of vacuum sand core suction filtration using castor oil-based water-based polyurethane as the polymer base material, solvent water and electromagnetic shielding filler as raw materials; the specific steps are as follows. preparation:

[0050] Step 1: Use ultrasonic dispersion for 24 hours to prepare an aqueous dispersion of graphene, with a concentration of 1 wt%, to obtain an electromagnetic shielding nanofiller dispersion for use; the mass of graphene used is 0.02g, 0.04g and 0.06g, respectively.

[0051] Step 2: prepare a responsive castor oil-based water-based polyurethane, dilute with deionized water to a concentration of 2 wt %, and obtain a polymer dispersion for use.

[0052] Step 3: The two raw material components obtained in steps 1 and 2 are added alternately to the vacuum suction filtration dev...

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Abstract

The invention discloses a flexible electromagnetic shielding film material with a bionic multilayer structure capable of being regulated into an isolation structure and a preparation method of the flexible electromagnetic shielding film material. The flexible electromagnetic shielding film material is prepared by the following steps: sequentially and alternately forming a film from responsive castor oil-based waterborne polyurethane and an electromagnetic shielding filler by utilizing a vacuum suction filtration technology; a multi-layer structure integrated material is formed by hydrogen bonds and electrostatic acting force, and the total thickness is 20-30 microns; in the components of the flexible electromagnetic shielding material, the proportion of the responsive castor oil-based waterborne polyurethane is 97-99 wt%, and the proportion of the electromagnetic shielding filler is 1-3 wt%. The thickness of the flexible electromagnetic shielding film material is only 20-30 [mu] m, a good electromagnetic shielding effect can be obtained, the electromagnetic shielding effectiveness under the X wave band can reach 20-80 dB, the reduction of the electromagnetic shielding effectiveness after the flexible electromagnetic shielding film material is converted into an isolation structure does not exceed 13%, and the electromagnetic shielding film has excellent fire safety performance with low heat release.

Description

technical field [0001] The invention relates to a flexible electromagnetic shielding film material whose bionic multi-layer structure can be adjusted into an isolation structure and a preparation method thereof, belonging to the field of electromagnetic shielding. Background technique [0002] At present, human communication is gradually developing towards the high-frequency band (1-30 GHz) represented by 5G and satellite communication, of which 8.2-12.4 GHz (X-band) plays an important role in communication. It is generally believed that the shielding effectiveness of materials higher than 20dB can meet the general civil needs, while commercial electromagnetic shielding products need to reach at least 30dB. Generally speaking, the efficiency value above 50dB belongs to high electromagnetic shielding material, and the aerospace-grade electromagnetic shielding material is required to reach more than 70dB. Therefore, the traditional metal electromagnetic shielding materials re...

Claims

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Application Information

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IPC IPC(8): H05K9/00C08G18/12C08G18/67C08G18/32C08G18/75
CPCH05K9/0081H05K9/0088C08G18/12C08G18/36C08G18/3275C08G18/3868C08G18/755
Inventor 汪碧波陆境一宋磊胡源
Owner UNIV OF SCI & TECH OF CHINA
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