Preparation method of polyaniline/carbon nano tube compound electromagnetic shielding material

A technology of carbon nanotube composite and electromagnetic shielding materials, which is applied in the field of preparation of polyaniline/carbon nanotube composite electromagnetic shielding materials, can solve the problems of affecting electromagnetic shielding performance and uneven carboxylation of carbon nanotubes, and achieves an increase in total Shielding effectiveness value, good electromagnetic wave shielding performance, effect of improving electromagnetic wave shielding performance

Inactive Publication Date: 2012-11-21
ANHUI UNIVERSITY
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  • Description
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  • Application Information

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Problems solved by technology

The Chinese patent (200610117325.3) involved in the "preparation method of multi-walled carbon nanotubes / polyaniline conductive composite material" is characterized by using carbon nanotubes as templates, first treating carbon nanotubes with concentrated nitric acid and concentrated sulfuric acid, and then using raw However, the carboxylation of carbon nanotubes in this method is not uniform, and the surface of the prepared polyaniline / carbon nanotube composite material is relatively smooth, which affects the electromagnetic shielding performance of the material.

Method used

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  • Preparation method of polyaniline/carbon nano tube compound electromagnetic shielding material
  • Preparation method of polyaniline/carbon nano tube compound electromagnetic shielding material
  • Preparation method of polyaniline/carbon nano tube compound electromagnetic shielding material

Examples

Experimental program
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Effect test

Embodiment 1

[0019] (a) Carboxylation of carbon nanotubes: 0.5 g of carbon nanotubes and 0.5 g of NaNO 3 Put them into 250ml three-neck flasks respectively, slowly add 20ml of concentrated H at 0°C and magnetic stirring 2 SO 4 , after stirring for 15min, slowly add 3.0g KMnO in 35°C water bath 4 , continue to stir for 2h; then slowly add 40ml of water, and stir for another 1h in a 90°C water bath; finally add 100ml of water and 3ml of 30% H 2 o 2 After mixing evenly, cool to room temperature; centrifuge washing with distilled water until neutral, and dry in a vacuum oven at 60°C to obtain carboxylated carbon nanotubes, such as figure 1 TEM images of carboxylated carbon nanotubes shown;

[0020] (b) Add 0.1 g of carboxylated carbon nanotubes to 40 ml of hydrochloric acid solution, and ultrasonically disperse for 1 hour; then add 0.32 g of aniline monomer into the hydrochloric acid solution, and ultrasonically disperse for 2 hours; then take 0.75 g of ammonium persulfate Dissolve in 20 ...

Embodiment 2

[0023] (a) Carboxylation of carbon nanotubes: 0.5 g of carbon nanotubes and 1.0 g of NaNO 3 Put them into 250ml three-necked flasks respectively, slowly add 30ml of concentrated H at 0°C and magnetic stirring 2 SO 4 , after stirring for 15min, slowly add 3.5g KMnO in 30°C water bath 4 , continue to stir for 2h; then slowly add 40ml of water, and stir for another 1h in a 90°C water bath; finally add 100ml of water and 3ml of 30% H 2 o 2 After mixing evenly, cool to room temperature; centrifuge washing with distilled water until neutral, and dry in a vacuum oven at 60°C to obtain carboxylated carbon nanotubes;

[0024] (b) Take 0.1g of carboxylated carbon nanotubes and add them to 40ml of hydrochloric acid solution, ultrasonically disperse for 1 hour; then add 0.5g of aniline monomer into the hydrochloric acid solution, and ultrasonically disperse for 2 hours; then take 0.8g of ammonium persulfate Dissolve in 20 ml of hydrochloric acid solution, mix well and slowly add to th...

Embodiment 3

[0027] (a) Carboxylation of carbon nanotubes: 0.5 g of carbon nanotubes and 0.3 g of NaNO 3 Put them into 250ml three-necked flasks respectively, and slowly add 20ml of concentrated H at 5°C under magnetic stirring conditions. 2 SO 4 , after stirring for 15min, slowly add 2.0g KMnO in 40°C water bath 4 , continue to stir for 2h; then slowly add 40ml of water, and stir for another 1h in a 90°C water bath; finally add 100ml of water and 3ml of 30% H 2 o 2 After mixing evenly, cool to room temperature; centrifuge washing with distilled water until neutral, and dry in a vacuum oven at 60°C to obtain carboxylated carbon nanotubes;

[0028] (b) Take 0.1g of carboxylated carbon nanotubes and add them to 40ml of hydrochloric acid solution, ultrasonically disperse for 1 hour; then add 0.6g of aniline monomer into the hydrochloric acid solution, and ultrasonically disperse for 2 hours; then take 1g of ammonium persulfate to dissolve In 20 ml of hydrochloric acid solution, after mixi...

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Abstract

The invention discloses a preparation method of a polyaniline / carbon nano tube compound electromagnetic shielding material. The preparation method comprises the following steps: (a) carboxylation of carbon nano tubes: adding concentrated H2SO4 into a mixture of carbon nano tubes and NaNO3 at low temperature, evenly stirring, raising the temperature, adding KMnO4, finally adding an H2O2 solution, and carrying out post-processing so as to obtain the carboxylated carbon nano tubes; and (b) preparation of the polyaniline / carbon nano tube compound shielding material. The surface of the polyaniline / carbon nano tube compound electromagnetic shielding material prepared by the method is composed of burr-shaped polyaniline nano fibers with rough surfaces. The polyaniline / carbon nano tube compound material has a large electromagnetic wave reflection section, thus the electromagnetic wave shielding property can be effectively improved; and the material has good electromagnetic shielding property in a microwave frequency band of 8-12 GHz, and can be used as a good electromagnetic shielding material.

Description

technical field [0001] The invention relates to a preparation method of polyaniline / carbon nanotube composite electromagnetic shielding material. Background technique [0002] It is known that polyaniline is an excellent electromagnetic shielding material, and carbon nanotubes are excellent electromagnetic wave absorbing materials in the microwave frequency range of 8.0-18.0 GHz. The composite material composed of conductive polyaniline-coated carbon nanotubes not only has good mechanical strength And easy processing performance, and because of the synergistic effect at the interface between the two, it may have better electromagnetic shielding performance than a single conductive polyaniline or carbon nanotubes, so it has broad application prospects in the field of electromagnetic shielding (EMI). The Chinese patent (200610117325.3) involved in the "preparation method of multi-walled carbon nanotubes / polyaniline conductive composite material" is characterized by using carbo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L79/02C08G73/02C08K9/02C08K7/00C08K3/04
Inventor 毕红李涛
Owner ANHUI UNIVERSITY
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