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A kind of nano flake doped polyaniline electromagnetic shielding material and preparation method thereof

An electromagnetic shielding material and nano-sheet technology, which is applied in the field of chemical oxidative polymerization to prepare nano-sheet doped polyaniline electromagnetic shielding materials, can solve problems such as reducing the conductivity of polyaniline, improve absorption effect and shielding efficiency, increase Contact area, strong operability effect

Active Publication Date: 2018-10-19
BEIJING TECHNOLOGY AND BUSINESS UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method introduces foreign substances as templates, which need to be removed during the process of obtaining the product, and the presence of templates reduces the electrical conductivity of polyaniline to a certain extent.

Method used

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  • A kind of nano flake doped polyaniline electromagnetic shielding material and preparation method thereof
  • A kind of nano flake doped polyaniline electromagnetic shielding material and preparation method thereof
  • A kind of nano flake doped polyaniline electromagnetic shielding material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] First prepare acid solutions of 1.5mol / L phosphoric acid and 1.5mol / L dodecylbenzenesulfonic acid respectively. Dissolve ammonium persulfate in 20mL of dodecylbenzenesulfonic acid solution with a concentration of 1.97mol / L, and call this solution A; disperse aniline monomer in 10mL of phosphoric acid solution with a concentration of 3.29mol / L, record for solution B. The two mixtures of A and B were ultrasonically dispersed for 0.5h and then cooled to 0°C. Put A in a constant pressure funnel, control the temperature of B solution to 0°C, stir the B solution at a stirring speed of 300 rpm, drop the A solution into B drop by drop, keep the dropping speed constant, and drop after 0.5h Finished adding. The stirring reaction was continued at this temperature for 4h. After the reaction, the mixture containing the target product was suction-filtered, washed repeatedly with deionized water and absolute ethanol until the filtrate was colorless, transparent and neutral. The ob...

Embodiment 2

[0023] The method is as in Example 1, except that the reaction temperature is reduced to -5°C. The prepared material was pressed into a thin sheet with a thickness of 0.35 mm. It was tested that the average size of the doped polyaniline was slightly lower than that in Example 1, which was 2.6 μm, and the thickness increased to 43 nm. It is tested that its electromagnetic shielding effectiveness is about 35dB when the electromagnetic wave frequency is 8.2-12.4GHz. The material microstructure size and electromagnetic shielding effectiveness are listed in Table 1.

Embodiment 3

[0025] The method is as in Example 1, except that the reaction temperature is reduced to -10°C. The prepared material was pressed into a thin sheet with a thickness of 0.35 mm. It was tested that the average size of the doped polyaniline was reduced to 2.1 μm compared with that in Example 1, and the thickness increased to 49 nm. It is tested that its electromagnetic shielding effectiveness is about 31dB when the electromagnetic wave frequency is 8.2-12.4GHz. The material microstructure size and electromagnetic shielding effectiveness are listed in Table 1.

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Abstract

The invention discloses a nanosheet-shaped polyaniline-doped electromagnetic shielding material and a preparation method thereof. The electromagnetic shielding material is of a nanosheet shape and has the average size of 1 to 6 microns and the thickness of 13nm to 95nm. Due to a nanosheet-shaped structure, the effective contact area between polyanilines in a two-dimensional direction can be increased, and the improvement on electric properties of the electromagnetic shielding material is facilitated; meanwhile, electromagnetic waves are effectively reflected among sheet layers when the electromagnetic waves pass through the material, and then, the electromagnetic shielding effectiveness of the material is improved. Through controlling the ratio of an acid mixture, monomer concentration and the consumption of an oxidant, the size and sheet layer thickness of the polyanilines can be regulated and controlled, and then, the electric properties and shielding effectiveness of the electromagnetic shielding material are regulated and controlled. According to the electromagnetic shielding material disclosed by the invention, the contact area of the polyanilines can be effectively increased, the electric properties are improved, the area of contact with the electromagnetic waves is increased, and then, the electromagnetic wave absorption effect and shielding effectiveness of the doped polyanilines are improved.

Description

technical field [0001] The invention belongs to the technical field of electromagnetic shielding, and in particular relates to an electromagnetic shielding material with nano flake-doped polyaniline and a method for preparing the electromagnetic shield material with nano flake doped polyaniline through chemical oxidation polymerization. Background technique [0002] Precision instruments and equipment often produce electromagnetic interference and electromagnetic radiation during work, which affects the normal operation of the equipment. Setting up an electromagnetic shielding layer is a simple and effective method to prevent electromagnetic interference and radiation hazards. Traditional electromagnetic shielding materials made of metal sheets limit their applicability due to heavy weight, difficult installation and high cost. Polyaniline, a conductive polymer material, has easy-to-obtain raw materials, simple preparation, good environmental stability, and adjustable conduc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G73/02
CPCC08G73/0266
Inventor 张扬邱穆楠温变英
Owner BEIJING TECHNOLOGY AND BUSINESS UNIVERSITY
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