Spiral electromagnetic shielding material and preparation method thereof

An electromagnetic shielding material and helical technology, applied in the direction of magnetic/electric field shielding, electrical components, etc., can solve the problems of irregular spring-like structure of helical carbon nanotubes, reduce the electromagnetic shielding performance of materials, and cumbersome preparation processes, etc., to achieve improved Electromagnetic shielding effectiveness, high electromagnetic energy absorption percentage, effect of enhanced absorption percentage

Active Publication Date: 2019-06-28
BEIJING TECHNOLOGY AND BUSINESS UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The preparation process of this method is cumbersome, and the spring-like structure of the helical carbon nanot

Method used

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  • Spiral electromagnetic shielding material and preparation method thereof
  • Spiral electromagnetic shielding material and preparation method thereof
  • Spiral electromagnetic shielding material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0024] Example 1:

[0025] Use trimethylolaminomethane and hydrochloric acid to prepare a buffer solution with a pH of 8.5; add spiral cotton fiber, manganese carbonate and dopamine hydrochloride to the buffer solution, and react at room temperature for 4 hours; the content of cotton fiber in the buffer solution is 2g / L, the content of manganese carbonate in the buffer solution is 4g / L, and the content of dopamine hydrochloride in the buffer solution is 1.5g / L; after the reaction is completed, the reactants are filtered and washed, and the product is marked as A.

[0026] Disperse product A and aniline monomer uniformly in a 1 mol / L sulfuric acid solution and record it as solution α. ​​The content of A in solution α is 4g / L, and the content of aniline monomer in solution α is 16g / L; 100ml of 1mol / L potassium permanganate sulfuric acid solution was dropped into 100ml of solution α, and oxidative polymerization reaction occurred at -5°C, and the reaction time was 6h.

[0027] After t...

Example Embodiment

[0028] Example 2:

[0029] The method is the same as in Example 1, and the ammonia soaking time is changed to 3s. It is tested that the electromagnetic shielding effectiveness of this spiral electromagnetic shielding material is about 97dB under the electromagnetic wave frequency of 8.2~12.4GHz, and the electromagnetic energy absorption percentage is about 94%. The electromagnetic shielding effectiveness and electromagnetic energy absorption percentage of the materials are listed in Table 1.

Example Embodiment

[0030] Example 3:

[0031] The method is the same as in Example 1, and the ammonia soaking time is changed to 20s. The electromagnetic shielding effectiveness of this spiral electromagnetic shielding material is about 94dB at the electromagnetic wave frequency of 8.2~12.4GHz, and the electromagnetic energy absorption percentage is about 95%. The electromagnetic shielding effectiveness and electromagnetic energy absorption percentage of the materials are listed in Table 1.

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Abstract

The invention discloses a spiral electromagnetic shielding material and a preparation method thereof. According to the electromagnetic shielding material, a cotton fiber having a DNA-like spiral structure is used as a template, manganese carbonate is modified on the surface of the cotton fiber by dopamine, then doped polyaniline is polymerized in situ on the surface thereof, and finally the contra-doping processing with ammonia water is performed. The invention organically combines the DNA-like spiral structure, the absorbing property of the manganese carbonate and the dielectric loss of the doped polyaniline, and effective multiple relaxation, interfacial polarization and multiple-reflection phenomena are induced such that the spiral electromagnetic shielding material has excellent electromagnetic shielding effectiveness. In addition, the contra-doping processing with ammonia water makes the material and air have good impedance matching characteristics, and therefore, the percentage of electromagnetic energy absorption of the spiral electromagnetic shielding material is greatly increased. The spiral electromagnetic shielding material provided by the invention has the characteristics of wide shielding range, high shielding efficiency, low cost and simple preparation process.

Description

technical field [0001] The invention belongs to the technical field of electromagnetic shielding functional materials, and specifically relates to an electromagnetic shielding material with a helical structure and a method for preparing the helical electromagnetic shielding material through dopamine self-polymerization and in-situ chemical oxidation polymerization. Background technique [0002] With the rapid development of the modern electronic industry, more and more electronic and electrical equipment are widely used in medical, communication, commercial and other fields. A large number of electromagnetic waves in space will not only affect the normal operation of electronic equipment, but also cause harm to human health. Electromagnetic pollution has become the fourth type of pollution besides air, water and noise pollution. The use of electromagnetic shielding materials is one of the effective measures to alleviate the above problems. [0003] Traditional electromagne...

Claims

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Application Information

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IPC IPC(8): H05K9/00C08G73/06C08G73/02
Inventor 张扬杨章静潘童温变英
Owner BEIJING TECHNOLOGY AND BUSINESS UNIVERSITY
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