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Flexible light and thin carbon cloth composite material with high electromagnetic shielding performance and preparation method thereof

A technology of electromagnetic shielding and composite materials, applied in the fields of magnetic field/electric field shielding, electrical components, heating/cooling fabrics, etc., can solve the problems of common conductivity, low hardness, and high hardness, and achieve low square resistance, good flexibility, and density. light effect

Pending Publication Date: 2022-04-12
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Purpose of the invention: The present invention aims at the problems of high density, high hardness, difficulty in commonality and low conductivity of electromagnetic shielding materials in the prior art, and provides a flexible, light and thin carbon cloth composite material with high electromagnetic shielding performance, and also provides The preparation method of above-mentioned composite material

Method used

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  • Flexible light and thin carbon cloth composite material with high electromagnetic shielding performance and preparation method thereof
  • Flexible light and thin carbon cloth composite material with high electromagnetic shielding performance and preparation method thereof
  • Flexible light and thin carbon cloth composite material with high electromagnetic shielding performance and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] a. Using impregnation method and carbonization process to prepare flexible, thin and high electromagnetic shielding performance carbon cloth composite material:

[0023] (a) Pretreatment of cotton fabric: soak the cotton fabric in 15g / L NaOH solution and boil for 1 hour to remove the pulp and impurities on the surface of the cotton fabric, then rinse it with ultrapure water for several times until it is neutral, then put it in an oven Dry at 60℃ for 1h;

[0024] (b) Surface modification of cotton fabrics: The cotton fabrics treated in (a) were immersed in 1 wt% hydroxypropyl-beta-cyclodextrin solution for 2 h, wherein hydroxypropyl-beta-cyclodextrin was dissolved in N-N - In dimethylformamide, the surface of the pretreated cotton fabric is further modified;

[0025] (c) Preparation of nickel-loaded carbonized cotton fabric: soak the modified cotton fabric in a solution of nickel chloride hexahydrate with a concentration of 1 mol / L for 24 h, and then dry it at 60 °C for...

Embodiment 2

[0040] a. Using carbonization process to prepare flexible and thin electromagnetic shielding material:

[0041] (a) Pretreatment of cotton fabric: soak the cotton fabric in 15g / L NaOH solution and boil for 1 hour to remove the pulp and impurities on the surface of the cotton fabric, then rinse it with ultrapure water for several times until it is neutral, then put it in an oven Dry at 60℃ for 1h;

[0042] (b) Preparation of carbonized cotton fabric: The treated cotton fabric was cut into 4*4 cm and calcined at 900 °C for 1 h in an argon atmosphere to prepare a flexible, light and thin composite carbon fabric.

[0043] b. Electromagnetic shielding performance test

[0044]Based on the waveguide method, the S-parameter test of the carbon cloth is carried out with a vector network analyzer in the frequency range of 12GHz to 18GHz. The specific process of the test is as follows: figure 2 shown. Knowing the S-parameters can be calculated:

[0045] R=|S 11 | 2 =|S 22 | 2 (...

Embodiment 3

[0057] Change the loading of flexible electromagnetic shielding material nickel

[0058] a. Using impregnation method and carbonization process to prepare flexible, thin and high electromagnetic shielding performance carbon cloth composite material:

[0059] (a) Pretreatment of cotton fabric: soak the cotton fabric in 15g / L NaOH solution and boil for 1 hour to remove the pulp and impurities on the surface of the cotton fabric, then rinse it with ultrapure water for several times until it is neutral, then put it in an oven Dry at 60℃ for 1h;

[0060] (b) Surface modification of cotton fabrics: The cotton fabrics treated in (a) were immersed in 1 wt% hydroxypropyl-beta-cyclodextrin solution for 2 h, wherein hydroxypropyl-beta-cyclodextrin was dissolved in N-N - In dimethylformamide, the surface of the pretreated cotton fabric is further modified;

[0061] (c) Preparation of nickel-loaded carbonized cotton fabric: The modified cotton fabric was soaked in a solution of nickel ch...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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Abstract

The invention discloses a flexible light and thin carbon cloth composite material with high electromagnetic shielding performance and a preparation method thereof. The flexible light and thin carbon cloth composite material is composed of carbonized cotton fabric and nickel single crystals growing on the carbonized cotton fabric in situ. The preparation method of the flexible light and thin carbon cloth composite material with the high electromagnetic shielding performance comprises the following steps: pretreating a cotton fabric with an alkaline solution, further modifying the surface of the cotton fabric with hydroxypropyl-beta-cyclodextrin, soaking the cotton fabric in a nickel chloride hexahydrate solution, and drying to obtain the flexible light and thin carbon cloth composite material with the high electromagnetic shielding performance. Drying and calcining to prepare the flexible, light and thin carbon cloth composite material with high electromagnetic shielding performance. According to the carbon cloth composite material, the combination of flexibility and high electromagnetic shielding performance is realized, the sheet resistance of the carbon cloth composite material can be as low as 0.6 omega / sq, the density of the carbon cloth composite material is light as 0.7056 g / cm < 3 >, the carbon cloth composite material has excellent conductivity, flexibility and electromagnetic shielding performance, and a new solution strategy is provided for the problem of electromagnetic wave pollution.

Description

technical field [0001] The invention relates to a carbon cloth composite material that is flexible, light, and high in electromagnetic shielding performance, and also relates to a preparation method of the composite material. Background technique [0002] Traditional electromagnetic shielding materials are often pure metal coatings or elemental metals, which limit their application in the field of electromagnetic shielding materials due to their high density and hardness, not easy to wear and common, and easy to corrode. At the same time, high-efficiency electromagnetic shielding carbon fiber composites are considered as substitutes for traditional metal-based shielding materials due to their low density, commonality, and good corrosion resistance. Conductivity is a decisive factor to measure the electromagnetic shielding performance of a material. However, the poor electrical conductivity and insulation properties of carbon fiber composites also limit their application in ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D06M11/38D06M15/03D06M11/83D06C7/04H05K9/00D06M101/06
Inventor 代云茜彭晓丽陆卫兵孟祥钰孙岳明
Owner SOUTHEAST UNIV
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