A kind of multi-component flexible paper-based electromagnetic shielding material and preparation method thereof

A technology of electromagnetic shielding materials and flexible paper, applied in shielding materials, magnetic field/electric field shielding, special paper, etc., can solve the problems of uneven dispersion, high temperature resistance, acid and alkali, etc., achieve stable working environment, solve thick, good The effect of stability

Active Publication Date: 2021-11-16
JIANGNAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Aiming at the electromagnetic pollution in the frequency band above 24GHz, the present invention provides a three-dimensional paper substrate constructed with high-performance polyimide (PI) fibers and aramid pulp that are resistant to high temperature and acid and alkali corrosion, and the in-situ synthesis method is used in PI In-situ growth of nano-silver wires on the fiber surface, and then loading PI resin containing oxidized multi-walled carbon nanotubes by impregnation method to enhance the mechanical properties and electromagnetic shielding properties of paper-based materials; on the one hand, in-situ synthesis of nano-silver wires and oxidized multi-walled carbon nanotubes The impregnation of nanotubes overcomes the phenomenon of uneven dispersion and agglomeration of silver nanowires and oxidized multi-walled carbon nanotubes in the traditional filler method; on the other hand, the use of high-performance PI fibers solves the problem that traditional paper-based electromagnetic shielding materials are not resistant to high temperature and acid and alkali , poor flexibility and other problems, effectively improve the electromagnetic shielding performance and mechanical properties of paper-based electromagnetic shielding materials, and broaden the application range for high-performance PI fiber composite materials

Method used

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  • A kind of multi-component flexible paper-based electromagnetic shielding material and preparation method thereof
  • A kind of multi-component flexible paper-based electromagnetic shielding material and preparation method thereof
  • A kind of multi-component flexible paper-based electromagnetic shielding material and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0059] A method for preparing a multi-component flexible paper-based electromagnetic shielding material, comprising the steps of:

[0060] (1) Preparation of acid-protonated PI fibers:

[0061] Soak the PI fiber in 1.0mol / L sodium hydroxide solution for 0.5h and then rinse it with water for 5 times; dry it at 45°C to obtain the alkali-treated PI fiber; then put the alkali-treated PI fiber at 0.5mol / L Soaked in the acetic acid solution for 0.5h, washed repeatedly with water for 5 times, and dried at 45°C to obtain acid-protonated PI fibers;

[0062] (2) Preparation of silver nanowires@PI fibers:

[0063] Add 0.4g of polyvinylpyrrolidone to 20mL of ethylene glycol to dissolve, then add 35g of 0.5mol / L ferric chloride solution and 0.25g of silver nitrate and mix to obtain a silver ion growth solution; then add 2.0g of PI fibers to 100mL of silver Ultrasonic dispersion in the ion growth solution is uniform, the ultrasonic power is 300W, and the ultrasonic time is 0.3h; after tha...

Embodiment 2

[0077] Adjusting the amount of silver nitrate added in Example 1 to 0.1g, 0.4g, and 0.6g, and keeping other parameters consistent with Example 1, a multi-component flexible paper-based electromagnetic shielding material with high-efficiency electromagnetic shielding performance was obtained.

[0078]The obtained multi-component flexible paper-based electromagnetic shielding material was tested for performance, and the test results are shown in Table 2. As can be seen from Table 2, when the addition of silver nitrate was 0.25g (embodiment 1), from the analysis of mechanical properties, electrical conductivity and electromagnetic shielding performance, the comprehensive performance of the prepared multi-component flexible paper-based electromagnetic shielding material was relatively high. it is good.

[0079] Table 2 Performance test results of multi-component flexible paper-based electromagnetic shielding materials obtained with different additions of silver nitrate

[0080] ...

Embodiment 3

[0082] Adjusting the in-situ growth time of silver nanowires in step (2) of Example 1 to 2h and 6h, and keeping other parameters unchanged, a multi-component flexible paper-based electromagnetic shielding material with high-efficiency electromagnetic shielding performance was obtained.

[0083] The performance test of the obtained multi-component flexible paper-based electromagnetic shielding material is carried out, and the test results are shown in Table 3 and Figure 4 , Figure 5 , Figure 6 . As can be seen from the test results, when the in-situ growth time of nano-silver wires was 4h (embodiment 1), from the analysis of mechanical properties, electrical conductivity and electromagnetic shielding performance, the comprehensive performance of the prepared multi-component flexible paper-based electromagnetic shielding material The performance is better.

[0084] Table 3 Performance test results of multi-component flexible paper-based electromagnetic shielding materials ...

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Abstract

The invention discloses a multi-component flexible paper-based electromagnetic shielding material and a preparation method thereof, belonging to the technical field of electromagnetic shielding. Based on the electromagnetic pollution in the frequency band above 24GHz, the present invention constructs a flexible paper-based conductive framework with nano-silver wire @PI fiber prepared by in-situ synthesis method and aramid pulp, and impregnates and fills the flexible paper-based framework with oxidized multi-walled carbon nanotubes. In the pores, after pressing and drying, a multi-component flexible paper-based electromagnetic shielding material is obtained. The invention not only solves the characteristics of traditional paper-based materials that are not resistant to high temperature and acid and alkali, but also overcomes the uneven dispersion and agglomeration of nano-silver wires and oxidized multi-walled carbon nanotubes in the traditional filling method. In addition, the prepared multi-component flexible paper-based electromagnetic shielding material has the characteristics of ultra-thin, flexible, high temperature resistance, and easy processing. At the same time, it has excellent electromagnetic shielding performance and mechanical properties in the 5G high-frequency band, and is easy to carry .

Description

technical field [0001] The invention relates to a multi-component flexible paper-based electromagnetic shielding material and a preparation method thereof, belonging to the technical field of electromagnetic shielding. Background technique [0002] At present, major countries in the world are accelerating the pace of commercialization of 5G. The 3GPP agreement of the International Telecommunication Standardization Organization stipulates that 5G independent networking mainly uses two frequency bands: FR1 frequency band and FR2 frequency band. The frequency range of the FR1 frequency band is 450MHz-6GHz, also known as the sub 6GHz frequency band; the frequency range of the FR2 frequency band is 24.25GHz-52.6GHz, and people usually call it millimeter wave (mmWave). Among them, the wavelength of the electromagnetic wave in the FR2 frequency band is short, the diffraction ability is poor, and the spatial attenuation of the signal is very serious. In order to realize the commerc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D06M11/83D21F11/00D21H27/00D21H13/26D21H17/67D21H17/56H05K9/00D06M101/30
CPCD06M11/83D06M2101/30D21F11/00D21H13/26D21H17/56D21H17/67D21H17/74D21H27/00H05K9/009
Inventor 龙柱张如强秦栋
Owner JIANGNAN UNIV
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