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Block copolymer electromagnetic shielding composite material with gradient cellular structure and preparation method of block copolymer electromagnetic shielding composite material

A technology of block copolymers and composite materials, applied in the fields of magnetic field/electric field shielding, electrical components, etc., can solve the problems of poor cell gradient and poor cell controllability, avoid secondary pollution, and improve wave absorption. Good performance and controllability

Active Publication Date: 2022-07-29
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to address the deficiencies of the prior art, to provide a block copolymer electromagnetic shielding composite material with a gradient cell structure and its preparation method, so as to improve the controllable gradient structure of cells in the existing gradient composite foam material The problem of poor performance and poor gradient of cells can improve the electromagnetic shielding performance of electromagnetic shielding composite materials

Method used

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  • Block copolymer electromagnetic shielding composite material with gradient cellular structure and preparation method of block copolymer electromagnetic shielding composite material
  • Block copolymer electromagnetic shielding composite material with gradient cellular structure and preparation method of block copolymer electromagnetic shielding composite material
  • Block copolymer electromagnetic shielding composite material with gradient cellular structure and preparation method of block copolymer electromagnetic shielding composite material

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Embodiment 1

[0038] In this embodiment, the steps of preparing a polyurethane electromagnetic shielding composite material with a gradient cell structure are as follows:

[0039] (1) Preparation of polyurethane / carbon nanotube composite blanks

[0040] Two thermoplastic polyurethanes with the same soft segment and hard segment composition but different ratios of soft segment and hard segment were taken, specifically thermoplastic polyurethanes with hardness of 70A and 80A.

[0041] The thermoplastic polyurethane with a hardness of 70A and carbon nanotubes were added to N,N-dimethylacetamide, and ultrasonicated for 1 h to obtain a blend dispersion. The amount of carbon nanotubes in the blend dispersion was 5% of the quality of the thermoplastic polyurethane. %.

[0042] The thermoplastic polyurethane with a hardness of 80A and carbon nanotubes were added to N,N-dimethylacetamide, and ultrasonicated for 1 h to obtain a blend dispersion. The amount of carbon nanotubes in the blend dispersion...

Embodiment 2

[0049] In the present embodiment, to prepare the polyester amide electromagnetic shielding composite material with gradient cell structure, the steps are as follows:

[0050] (1) Preparation of polyester amide / carbon nanotube composites

[0051] Two polyester amide thermoplastic elastomers with the same soft segment and hard segment composition but different soft segment and hard segment ratio were taken, specifically polyester amide with hardness of 90A and 65D.

[0052] The polyester amide thermoplastic elastomer with a hardness of 90A and carbon nanotubes were added to an internal mixer and blended at 240° C. for 10 minutes. The amount of carbon nanotubes in the blend was 1% of the mass of the polyester amide thermoplastic elastomer.

[0053] The polyester amide thermoplastic elastomer with a hardness of 65D and carbon nanotubes were added to an internal mixer and blended at 270° C. for 10 minutes. The amount of carbon nanotubes in the blend was 5% of the mass of the polyes...

Embodiment 3

[0059] In this embodiment, the steps of preparing a polyurethane electromagnetic shielding composite material with a gradient cell structure are as follows:

[0060] (1) Preparation of polyurethane / carbon nanotube composite blanks

[0061] Three thermoplastic polyurethanes with the same soft segment and hard segment composition but different ratios of soft segment and hard segment were selected, specifically thermoplastic polyurethanes with hardness of 70A, 80A and 90A.

[0062] The thermoplastic polyurethane and carbon nanotubes with a hardness of 70A were added to N,N-dimethylacetamide, and ultrasonicated for 1 h to obtain a blend dispersion. The amount of carbon nanotubes in the blend dispersion was 6% of the mass of the thermoplastic polyurethane. %.

[0063] The thermoplastic polyurethane and carbon nanotubes with a hardness of 80A were added to N,N-dimethylacetamide, and ultrasonicated for 1 h to obtain a blend dispersion. The amount of carbon nanotubes in the blend dis...

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Abstract

The invention provides a segmented copolymer electromagnetic shielding composite material with a gradient cellular structure and a preparation method thereof.The composite material is composed of a segmented copolymer matrix and conductive filler, and the conductive filler is distributed in the matrix to form a conductive network; the cell size and cell density in the matrix are in gradient change along the thickness direction of the composite material, the soft segments of the block copolymers at different parts of the composite material are the same, the hard segments of the block copolymers at different parts of the composite material are the same, and the proportion of the soft segments to the hard segments of the block copolymers is in gradient change along the thickness direction of the composite material. According to the invention, the problems of poor controllability and poor gradient of the gradient structure of the foam holes in the existing gradient composite foam material can be improved, and the electromagnetic shielding performance of the electromagnetic shielding composite material is improved.

Description

technical field [0001] The invention belongs to the field of electromagnetic shielding materials, and relates to a block copolymer electromagnetic shielding composite material with a gradient cell structure and a preparation method thereof. Background technique [0002] With the rapid development of electronic equipment, electromagnetic wave pollution is becoming more and more serious. Electromagnetic wave pollution will not only interfere with the use of communication equipment, aerospace equipment, medical equipment and other precision instruments, but also cause irreversible damage to the human body. In order to reduce electromagnetic wave pollution, a variety of electromagnetic shielding composite materials have been proposed in the prior art, but the electromagnetic shielding function of these materials is generally realized by increasing the electrical conductivity, which tends to increase the reflection coefficient and reduce the absorption coefficient, which makes a ...

Claims

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Application Information

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IPC IPC(8): C08J9/12C08L75/04C08K3/04C08L77/12B29C44/12B29C44/34H05K9/00
CPCC08J9/122C08J9/0071C08J9/0061B29C44/12B29C44/34H05K9/0081C08J2203/06C08J2203/08C08J2375/04C08J2475/04C08J2377/12C08J2477/12Y02A30/00
Inventor 廖霞王晓涵邹芳芳赵毅珅
Owner SICHUAN UNIV
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