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Composite material with electromagnetic shielding effect and preparation method thereof

A technology of composite materials and composite material boards, applied in the jointing of wooden veneers, magnetic field/electric field shielding, paper coating, etc.

Inactive Publication Date: 2010-08-18
漳州市奈特新型建材有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] A variety of electromagnetic wave shielding coatings have been developed. Generally, graphite, copper powder, silver powder, nickel powder, aluminum powder, etc. are used as conductive materials to make coatings. However, the electromagnetic wave shielding range of these coatings is only for electromagnetic waves in the MHz range.

Method used

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  • Composite material with electromagnetic shielding effect and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0037] The multi-walled carbon nanotubes were azeotroped with 480g of sulfuric acid / nitric acid (160g of sulfuric acid and 320g of nitric acid) at 50°C for 24 hours, then washed with a large amount of pure water, filtered 6 times, and then dried. The multi-walled carbon nanotubes are azeotroped with a strong acid to generate -OH and -COOH functional groups on the surface, and the functional groups can make the multi-walled carbon nanotubes disperse in the polymer material.

[0038] 2.62 g of multi-walled carbon nanotubes modified according to the above method were dispersed in 50 g of toluene solvent, and 262 g of high-molecular polyacrylonitrile was added, and stirred at 25° C. to form a multi-walled carbon nanotube / polyacrylonitrile nanocomposite material. The above-mentioned multi-walled carbon nanotube / polyacrylonitrile nanocomposite material was coated on 20cm×20cm waste paper, and the coating thickness was 0.1mm.

[0039] Dry naturally or heat to evaporate the solvent an...

Embodiment 2

[0053] The multi-wall carbon nanotubes were first azeotroped with 480g of sulfuric acid / nitric acid (120g of sulfuric acid and 360g of nitric acid) at 40°C for 30 hours, then washed with a large amount of pure water, filtered 6 times, and then dried.

[0054] 4 g of multi-walled carbon nanotubes were dispersed in 30 g of dimethylacetamide solvent, added with 99.5 g of polymer polystyrene, and stirred at 25° C. to form a multi-walled carbon nanotube / polystyrene nanocomposite material. The above-mentioned multi-walled carbon nanotube / polystyrene nanocomposite material was coated on a 20 cm×20 cm PET film, and the coating thickness was 0.1 mm. And overlap them into boards (15 to 21 layers) as needed.

[0055] Among the above materials, multi-walled carbon nanotubes play the role of shielding electromagnetic waves, and dimethylacetamide is a good solvent for polyacrylonitrile, which can make the composite material into a gel and facilitate coating.

Embodiment 3

[0057] The multi-walled carbon nanotubes were first azeotroped with 480g of sulfuric acid / nitric acid (320g of sulfuric acid and 160g of nitric acid) at 70°C for 10 hours, then washed with a large amount of pure water, filtered 6 times, and then dried.

[0058] 0.5 g of multi-walled carbon nanotubes were dispersed in 15 g of tetrahydrofuran solvent, and 96 g of acrylonitrile-butadiene styrene copolymer was added.

[0059] Similar to Example 1, the difference is that the above-mentioned multi-walled carbon nanotube / acrylonitrile-butadiene styrene copolymer composite material is not coated on paper, but coated on a wood board, and its coating thickness 1.5mm.

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Abstract

The invention discloses a composite material with electromagnetic shielding effect and a preparation method thereof. The composite material comprises the following components in parts by mass: 0.5 to 4 parts of carbon nano-tube, 96 to 99.5 parts of macromolecular polymer and 15 to 30 parts of solvent, wherein the carbon nano-tube is a modified single-walled carbon nano-tube or a multiwall carbon nano-tube; the solvent is one of dimethylacetylamide, toluene and tetrahydrofuran; and the composite material is applied to paper or a PET film and the like to form a composite material plate with the electromagnetic shielding effect. The electromagnetic shielding plate manufactured according to the method has excellent shielding effect in a GHz range, in particular close to 14.5GHz.

Description

[0001] manual [0002] A composite material with electromagnetic wave shielding effect and a preparation method thereof. technical field [0003] The invention relates to a composite material with electromagnetic wave shielding effect and a preparation method thereof, in particular to a composite material with electromagnetic wave shielding in the GHz range and a preparation method thereof. Background technique [0004] The bandwidth of electromagnetic waves is very large, listed by frequency, including the shortest cosmic rays, superimposed rays, medical X-rays, beta rays, Al emission lines, and high-energy ultraviolet rays, etc. The energy of the above electromagnetic waves is very strong, which can make electrons It leaves the control range of atoms, so it is called ionizing radiation. The following electromagnetic waves include low-energy ultraviolet rays, visible light, infrared rays, electromagnetic waves used by radio and television channels, mobile phone communicatio...

Claims

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Application Information

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IPC IPC(8): C08L63/00C08L61/24C08L61/06C08L33/20C08L79/08C08L25/06C08L75/04C08L67/06C08L55/02C08L77/00C08L81/06C08L91/00C08K9/02C08K7/00C08K3/04D21H19/14B27D1/04B05D7/26B32B33/00H05K9/00
Inventor 阮韶铭林镇辉
Owner 漳州市奈特新型建材有限责任公司
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