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Graphene/carbon nanotube composite electromagnetic shielding paper and preparation method thereof

A carbon nanotube composite and electromagnetic shielding technology, which is applied in papermaking, paper coating, textiles, and papermaking, can solve the problems of low shielding efficiency, poor mechanical properties, and complicated preparation process of electromagnetic shielding paper, and achieve low cost and improved electrical conductivity. The effect of simple performance and preparation process

Inactive Publication Date: 2018-12-07
NO 33 RES INST OF CHINA ELECTRONICS TECHNOOGY GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In order to overcome the problems of low shielding efficiency, poor mechanical properties and complicated preparation process of the electromagnetic shielding paper prepared in the prior art, the present invention provides a graphene / carbon nanotube composite electromagnetic shielding paper and its preparation method

Method used

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  • Graphene/carbon nanotube composite electromagnetic shielding paper and preparation method thereof

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preparation example Construction

[0028] A graphene / carbon nanotube composite electromagnetic shielding paper and a preparation method thereof, comprising the following raw materials in parts by weight: 100 parts of polyurethane resin, 10 to 75 parts of graphene, 5 to 50 parts of carbon nanotubes, and 20 to 100 parts of silane coupling agent parts, 8~40 parts of deionized water, 72~360 parts of ethanol, 3~6 parts of surfactant, graphene and carbon nanotubes are lapped together by silane coupling agent, and the bonded graphene and carbon nanotubes are bonded together by polyurethane resin. Carbon nanotubes are fully dispersed and adsorbed on the surface of paper fibers.

[0029] The silane coupling agent is at least one of γ-aminopropyltriethoxysilane, γ-aminopropyltrimethoxysilane and anilinomethyltriethoxysilane.

[0030] The surfactant is at least one of sodium lauryl sulfate, sodium lauryl sulfate, cetyltrimethylammonium bromide, and polyvinylpyrrolidone.

[0031] figure 1 It is the process flow of the pr...

Embodiment 1

[0033] S1. Take 20 parts of γ-aminopropyltriethoxysilane, 8 parts of deionized water, and 72 parts of ethanol, mix and mechanically stir for 30 minutes to prepare a silane coupling agent dispersion;

[0034] S2. Weigh 10 parts of graphene and 5 parts of carbon nanotubes and add them to the S1 silane coupling agent dispersion. Under the heating condition of 60°C, the mixed solution is continuously stirred for 12 hours, the mixed solution is vacuum filtered, and the product is washed with ethanol for 3 Once, dry in an oven at 80°C to obtain a surface-modified graphene / carbon nanotube mixture;

[0035] S3. Add the surface-modified graphene / carbon nanotube mixture obtained in S2 and 3 parts of sodium lauryl sulfate to an aqueous polyurethane emulsion (containing 100 parts of polyurethane) with a solid content of 20%, and use them alternately at room temperature Ultrasonic and high-speed shear dispersion 3 times, each ultrasonic dispersion time is 2h, high-speed shear dispersion ti...

Embodiment 2

[0039] S1. Take 50 parts of γ-aminopropyltrimethoxysilane, 20 parts of deionized water, and 180 parts of ethanol, mix and mechanically stir for 30 minutes to prepare a silane coupling agent dispersion;

[0040]S2. Weigh 30 parts of graphene and 50 parts of carbon nanotubes and add them to the S1 silane coupling agent dispersion. Under the heating condition of 60°C, the mixed solution is continuously stirred for 12 hours, the mixed solution is vacuum filtered, and the product is washed with ethanol for 3 Once, dry in an oven at 80°C to obtain a surface-modified graphene / carbon nanotube mixture;

[0041] S3. Add the surface-modified graphene / carbon nanotube mixture obtained in S2 and 5 parts of polyvinylpyrrolidone to an aqueous polyurethane emulsion (containing 100 parts of polyurethane) with a solid content of 15%, and alternately use ultrasound and high-speed at room temperature Shear dispersion 3 times, each ultrasonic dispersion time is 2h, high-speed shear dispersion time ...

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Abstract

The present invention relates to the field of electromagnetic shielding technology, and more particularly relates to graphene / carbon nanotube composite electromagnetic shielding paper and a preparation method thereof. Graphene and carbon nanotubes as conductive agents and thermoplastic polyurethane as a matrix are used for preparing a conductive coating, the graphene and the carbon nanotubes overlap each other to form a continuous conductive network, the electrical conductivity of the coating can be significantly improved; the conductive coating is pulled on cotton fiber paper to form a film to obtain the electromagnetic shielding paper, the thermoplastic polyurethane allows the graphene and the carbon nanotubes to be firmly attached to the surface of the cotton fiber paper, and the problems that the bonding force between the conductive agent and the paper fiber is poor and powder is easy to fall off can be solved. The graphene / carbon nanotube composite electromagnetic shielding paperhas high shielding efficiency and wide frequency bandwidth, but also has excellent characteristics such as light weight, ultra-thinness and softness, has simple preparation process, low cost and easyrealization of large-scale production, and provides a solution to solve the electromagnetic compatibility problem of portable electronic products.

Description

technical field [0001] The invention relates to the technical field of electromagnetic shielding, and more specifically relates to a graphene / carbon nanotube composite electromagnetic shielding paper and a preparation method thereof. Background technique [0002] With the rapid development of the electronic industry, various electronic devices gradually enter people's lives, and the problem of electromagnetic pollution also arises. Electromagnetic pollution poses a huge threat to human health and the electromagnetic compatibility of electronic products, and has become the fourth largest pollution after water pollution, air pollution and solid waste pollution. In order to reduce the harm of electromagnetic pollution, using electromagnetic shielding materials to attenuate and reflect harmful electromagnetic waves is an effective method. Therefore, research on electromagnetic shielding materials is urgent. [0003] Under the trend of miniaturization and complex structure of e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21H19/24D21H19/14D21H21/14
CPCD21H19/14D21H19/24D21H21/14
Inventor 刘伟谷建宇贾琨马江将王东红李克训张捷
Owner NO 33 RES INST OF CHINA ELECTRONICS TECHNOOGY GRP
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