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A kind of flexible graphene-based composite film and its preparation method and application as electromagnetic shielding material

A technology of flexible graphite and composite materials, applied in the direction of magnetic/electric field shielding, electrical components, etc., can solve problems such as poor conductivity, achieve high conductivity, good electromagnetic shielding performance, and uniform distribution of components

Active Publication Date: 2020-10-16
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The graphene / ferroferric oxide composites prepared by these methods are mainly dense and inflexible structures with poor electrical conductivity.

Method used

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  • A kind of flexible graphene-based composite film and its preparation method and application as electromagnetic shielding material
  • A kind of flexible graphene-based composite film and its preparation method and application as electromagnetic shielding material
  • A kind of flexible graphene-based composite film and its preparation method and application as electromagnetic shielding material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] (1) Weigh 30 mg of graphene oxide, add it to a beaker, add 160 ml of absolute ethanol, and work for 15 minutes under the cell pulverizer to obtain a uniform dispersion. Then add 33 wt% of silver-loaded carbon nanofibers and 17 wt% of magnetic ferric iron tetroxide powder according to the mass fraction, and continue to disperse the mixed solution with a cell pulverizer.

[0051] (2) Evenly disperse 30 mg of sodium alginate powder into 40 ml of distilled water, mix with the dispersion in step (1), and then work for 15 minutes under the cell pulverizer.

[0052] (3) The mixed solution obtained in the step (2) is vacuum filtered to obtain a composite film, which is left to dry at normal temperature and pressure for 12 hours.

[0053] (4) Remove the film obtained in step (3), seal it and place it in a polytetrafluoroethylene-lined stainless steel autoclave to which 4 drops of hydrazine hydrate has been added dropwise, heat it to 100°C and keep it at a constant temperature fo...

Embodiment 2

[0056] (1) Weigh 30 mg of graphene oxide, add it to a beaker, add 160 ml of absolute ethanol, and work for 15 minutes under the cell pulverizer to obtain a uniform dispersion. Then add 43wt% of silver-loaded carbon nanofibers and 14wt% of magnetic ferric iron tetroxide powder according to the mass fraction, and continue to disperse the mixed solution with a cell pulverizer.

[0057] (2) Evenly disperse 30 mg of sodium alginate powder into 40 ml of distilled water, mix with the dispersion in step (1), and then work for 15 minutes under the cell pulverizer.

[0058] (3) The mixed solution obtained in the step (2) is vacuum filtered to obtain a composite film, which is left to dry at normal temperature and pressure for 12 hours.

[0059] (4) Remove the film obtained in step (3), seal it and place it in a polytetrafluoroethylene-lined stainless steel autoclave to which 4 drops of hydrazine hydrate has been added dropwise, heat it to 110°C and keep it at a constant temperature for ...

Embodiment 3

[0062] (1) Weigh 30 mg of graphene oxide, add it to a beaker, add 160 ml of absolute ethanol, and work for 15 minutes under the cell pulverizer to obtain a uniform dispersion. Then add 33wt% of silver-loaded carbon nanofibers and 33wt% of magnetic ferric iron tetroxide powder according to the mass fraction, and continue to disperse the mixed solution with a cell pulverizer.

[0063] (2) Evenly disperse 30 mg of sodium alginate powder into 40 ml of distilled water, mix with the dispersion in step (1), and then work for 15 minutes under the cell pulverizer.

[0064] (3) The mixed solution obtained in the step (2) is vacuum filtered to obtain a composite film, which is left to dry at normal temperature and pressure for 12 hours.

[0065] (4) Remove the film obtained in step (3), seal it and place it in a polytetrafluoroethylene-lined stainless steel autoclave to which 4 drops of hydrazine hydrate has been added dropwise, heat it to 120°C and keep it at a constant temperature for ...

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Abstract

The invention discloses a flexible graphene-based composite film, and a preparation method and application thereof as an electromagnetic shielding material. The preparation method comprises the following steps: processing graphene oxide and a solvent through a cell disruptor, then adding a silver / carbon nanofiber composite material and magnetic ferroferric oxide, performing processing by a cell disruptor, finally adding a sodium alginate solution and performing processing by a cell disruptor to obtain a dispersion; processing the dispersion by a vacuum filtration process to obtain a compositefilm structure; and putting the film structure in a closed kettle loaded with a low-boiling-point liquid reducing agent, and performing reduction by a fumigation process, so as to obtain the flexiblegraphene-based composite film with uniform component distribution, a porous structure and good flexibility. The flexible graphene-based composite film has good electromagnetic shielding effectiveness,and the preparation method has a simple and efficient operation process, and is easy for industrial production and application.

Description

technical field [0001] The invention relates to an electromagnetic shielding material, in particular to a flexible graphene-based composite film and its preparation method and application, belonging to the field of electromagnetic shielding material preparation. Background technique [0002] Ferric oxide (Fe 3 o 4 ) as the main component of magnetite is a traditional magnetic material. As the earliest non-metallic magnetic material, ferric oxide has many excellent physical and chemical properties. Therefore, ferric oxide has been favored by researchers in the field of application research of magnetic materials. At present, magnetic composite materials have been widely used in various fields, such as electromagnetic wave absorption, lithium-ion batteries, targeted drug delivery, magnetic resonance imaging, high-efficiency circulation oil-absorbing materials, and heavy metal ion adsorption. Fe3O4 functional composites are a major trend in the field of magnetic material rese...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J5/18C08L5/04C08K13/06C08K9/04C08K9/12C08K3/04C08K3/08C08K7/06C08K3/22C08K7/24H05K9/00
CPCC08J5/18C08J2305/04C08K3/04C08K7/06C08K9/04C08K9/12C08K13/06C08K2003/0806C08K2003/2275H05K9/0081H05K9/0083
Inventor 岳建岭王悦黄小忠唐秀之杜作娟
Owner CENT SOUTH UNIV
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