Electromagnetic shielding function composite gel with oriented porous structure and preparation method thereof

A porous structure and composite gel technology, applied in the direction of magnetic/electric field shielding, electrical components, etc., can solve the problems of not giving full play to the advantages of compounding between components with electromagnetic functions, environmental pollution, etc., and achieve excellent electromagnetic shielding performance and easy process control , The effect of simple preparation process

Active Publication Date: 2021-07-06
BEIJING TECHNOLOGY AND BUSINESS UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This preparation method is only effective for graphene with a sheet structure. The use of a large amount of organic solvents and foaming agents in the preparation process is likely to cause environmental pollution, and only graphene is used to prepare aerogels, and there is no compounding between components that exert electromagnetic functions. Advantage

Method used

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  • Electromagnetic shielding function composite gel with oriented porous structure and preparation method thereof
  • Electromagnetic shielding function composite gel with oriented porous structure and preparation method thereof
  • Electromagnetic shielding function composite gel with oriented porous structure and preparation method thereof

Examples

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Effect test

preparation example Construction

[0031] The preparation method of the above-mentioned electromagnetic shielding functional composite gel with an oriented porous structure adopts solution casting and directional freeze-drying technology to construct an oriented porous structure, which specifically includes the following steps:

[0032] The first step is to dissolve 2.0g of polyvinyl alcohol particles in 20.0mL of deionized water at 95°C using high-speed mechanical stirring to prepare a polyvinyl alcohol aqueous solution, add nickel powder in different proportions to the above solution, and stir for 8 hours to obtain a solution R1;

[0033] In the second step, 2.0 g of polyvinyl alcohol particles were dissolved in 20.0 mL of 1 wt.% poly(3,4-ethylenedioxythiophene): polyethylene sulfonic acid aqueous solution at 95° C. using high-speed mechanical stirring, Stir for 2h to obtain solution R2;

[0034] The third step is to cast the solution R1 in a horizontal polytetrafluoroethylene mold after vacuum defoaming, an...

Embodiment 1

[0041] (1) Using a 50ml three-neck flask, add 20.0ml of deionized water, weigh 2.0g of polyvinyl alcohol and transfer it to the flask. At 95°C, the polyvinyl alcohol was completely dissolved by mechanical stirring at a speed of 700r / min. Weigh 0.2g of spherical nickel powder and 0.2g of flake nickel powder, transfer the mixed nickel powder to the polyvinyl alcohol solution under the conditions of maintaining 95°C and 700r / min, stir for 8 hours to completely disperse the nickel powder to obtain solution R1.

[0042] (2) Using a 50ml three-necked flask, add 20.0ml of 1wt.% poly(3,4-ethylenedioxythiophene): an aqueous solution of polyethylene sulfonic acid, weigh 2.0g of polyvinyl alcohol and transfer it to the flask . Dissolve the polyvinyl alcohol at 95°C with mechanical stirring at a speed of 700r / min. Stir for 2 h to completely dissolve the polyvinyl alcohol to obtain solution R2.

[0043] (3) After degassing the solution R1, drool in a horizontally placed polytetrafluoroe...

Embodiment 2

[0045] The method is as in Example 1, in (1), 0.27g of spherical nickel powder and 0.13g of flake nickel powder are weighed. The electromagnetic shielding effectiveness of the composite gel can reach 44.3dB. Absorption losses account for 85.5% of the total shielding effectiveness.

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Abstract

The invention provides electromagnetic shielding function composite gel with an oriented porous structure and a preparation method thereof. The composite gel is prepared by using solution casting and oriented freeze-drying directions. The metal conductive filler of the composite gel is mainly distributed on the lower side of the composite gel material, and the content of the metal conductive filler is in gradient distribution from high to low from the lower surface to the middle of the material in the thickness direction of the material; the intrinsic conductive polymer is mainly distributed on the upper side of the composite gel material; in the middle of the functional material, the metal conductive filler and the intrinsic conductive polymer form a filler mixed distribution transition area. In the thickness direction of the composite gel, the composite gel has an oriented porous structure, and the hole size is gradually reduced from the lower surface to the upper surface. By means of the oriented trumpet-shaped hole structure and the unique spatial distribution of the functional filler in the thickness direction, the synergistic attenuation effect of the filler on electromagnetic waves can be efficiently exerted, and the functional composite gel has excellent electromagnetic shielding effectiveness and strong absorption loss characteristics.

Description

technical field [0001] The present invention relates to the technical field of electromagnetic shielding composite materials, in particular to an electromagnetic shielding functional composite gel with an oriented porous structure, and a method for preparing an oriented porous structure electromagnetic shielding functional composite gel by directional freeze-drying method. Background technique [0002] With the advancement of science and technology, electronic equipment is gradually developing in the direction of integration, high frequency, and light weight. The problems of electromagnetic radiation and electromagnetic interference seriously affect the normal operation of precision equipment, and at the same time threaten human health. The use of electromagnetic shielding materials is One of the main means to avoid the above hazards. [0003] Metal electromagnetic shielding materials have excellent electromagnetic shielding performance, but the high conductivity makes elec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L29/04C08L41/00C08L65/00C08K7/00C08K3/08C08K7/18C08J9/28H05K9/00
CPCC08J9/28C08J9/0061C08J9/0066H05K9/0083C08J2329/04C08J2441/00C08J2465/00C08J2201/0484C08J2205/024
Inventor 张扬高晗
Owner BEIJING TECHNOLOGY AND BUSINESS UNIVERSITY
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