A kind of electromagnetic shielding composite material and preparation method thereof

A composite material, electromagnetic shielding technology, applied in chemical instruments and methods, synthetic resin layered products, layered products, etc., can solve the problems of limited preparation and application, limited electromagnetic wave shielding effect, etc. Good electrostatic effect and the effect of improving connection strength

Active Publication Date: 2021-01-29
CHANGDE LYRUN MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The shielding effect of a single type and single structure shielding material on electromagnetic waves is limited
For this reason, on the basis of schelkkunoff's multilayer electromagnetic shielding theory, people proposed a sandwich model and derived its shielding effectiveness incremental function relationship, but this sandwich structure is limited to conductive coatings and metal foil layers due to thickness and preparation methods. Seriously limit its preparation and application in microporous foam structure shielding materials

Method used

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  • A kind of electromagnetic shielding composite material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] The present invention comprises the steps:

[0033] (1) Add the spray liquid (5 mg / l) prepared by inorganic nanoparticles: carbon powder and solvent absolute ethanol into the spray device, and then align the nozzles of the spray device with the two sides of the polyurethane sponge respectively, start The spraying device sprays, after the spraying is completed, the solvent volatilizes, and the carbon powder adheres to the polyurethane sponge tendons.

[0034] (2) preparation contains the macromolecular polymer spinning solution (polymer concentration is 0.1g / ml in the spinning solution; polymer type is polyurethane) containing a certain amount of carbon nanotubes (weight concentration is 5%), solvent is three Chloromethane, and using traditional electrospinning method (solution flow rate 3ml / h, voltage 10kv, pole distance 20cm, time 20min) all prepare dense carbon nanotubes on both sides of the polyurethane sponge with inorganic nanoparticles obtained in (1) Reinforce t...

Embodiment 2

[0039] The present invention comprises the steps:

[0040] (1) Add the spraying solution (0.2mg / l) prepared by inorganic nanoparticle graphene and solvent acetone into the spraying device, then aim the nozzles of the spraying device at the two sides of the polyurethane sponge respectively, and start the spraying device Spraying, after spraying, the solvent volatilizes, and the inorganic nanoparticles are attached to the polyurethane sponge tendons.

[0041] (2) preparation contains the polymer spinning solution (polymer concentration is 0.2g / ml in the spinning solution; Polymer type is polyvinyl alcohol, and solvent is water, and using the traditional electrospinning method (solution flow rate 2ml / h, voltage 15kv, pole distance 30cm, time 30min), the polyurethane sponge with inorganic nanoparticles obtained in (1) is prepared with dense carbon nanotubes on both sides. The polymer single-layer nanofiber film is heated and dried (50°C, 6h), so as to obtain a sandwich carbon nan...

Embodiment 3

[0045] The present invention comprises the steps:

[0046] (1) Add the spraying solution (15 mg / l) prepared by inorganic nanoparticles ferric oxide and solvent hydrochloric acid into the spraying device, then align the nozzles of the spraying device with the two sides of the polyurethane sponge, and start the spraying device Spraying, after spraying, the solvent volatilizes, and the inorganic nanoparticles are attached to the polyurethane sponge tendons.

[0047] (2) prepare the polymer spinning solution (polymer concentration is 0.05g / ml in the spinning solution; the polymer type is polyacrylonitrile) containing a certain amount of carbon nanotubes (weight concentration is 8%), solvent For dimethylacetamide, adopt the traditional electrospinning method (solution flow rate 5ml / h, voltage 20kv, pole distance 15cm, time 25min) in (1) the two sides of polyurethane sponge with inorganic nanoparticles are all prepared Dense carbon nanotube-reinforced polymer single-layer nanofiber...

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Abstract

The invention belongs to the technical field of electromagnetic shielding, and in particular relates to an electromagnetic shielding composite material and a preparation method thereof. The electromagnetic shielding composite material has a sandwich structure, and the inner layer is a polyurethane sponge with inorganic nanoparticles attached to the surface and internal tendons. Both sides are polymer nanofiber films embedded with carbon nanotubes, and metal film layers are attached to the surfaces of the polyurethane sponge, polymer nanofiber films and inorganic nanoparticles. The material of the present invention has a good electromagnetic shielding effect and is a high-loss Type electromagnetic shielding material.

Description

technical field [0001] The invention belongs to the technical field of electromagnetic shielding, and in particular relates to an electromagnetic shielding composite material and a preparation method thereof. Background technique [0002] With the popular use of electronic appliances and radio communications, electromagnetic radiation has become another major pollution after air pollution, water pollution, solid waste pollution and noise pollution; electromagnetic radiation not only seriously affects people's health, but also has mutual interference and Affect the transmission and normal operation of its own electronic signals. At present, the main method to eliminate the hazards of electromagnetic waves is to use electromagnetic shielding materials to shield them. Therefore, exploring efficient electromagnetic shielding materials has become an urgent problem to be solved. [0003] Electromagnetic shielding materials are mainly divided into: metal electromagnetic shielding ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B32B27/02B32B27/06B32B27/12B32B27/40C08J9/36C08L75/04
CPCB32B27/02B32B27/06B32B27/12B32B27/40C08J9/36C08L75/04
Inventor 肖进春曾艳邹超
Owner CHANGDE LYRUN MATERIAL
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