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Absorbing material and preparation method thereof

A technology of wave-absorbing materials and composite materials, which is applied in the field of materials, can solve problems such as the cumbersome method of changing the density gradient of wave-absorbing materials, and achieve the effects of reduced reflection, high electromagnetic wave absorption characteristics, and excellent performance

Active Publication Date: 2019-04-02
INST OF MICROELECTRONICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The main purpose of the present invention is to provide a microwave-absorbing material and its preparation method, so as to solve the problem that the method for realizing the density gradient change of the microwave-absorbing material in the prior art is very cumbersome

Method used

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  • Absorbing material and preparation method thereof
  • Absorbing material and preparation method thereof
  • Absorbing material and preparation method thereof

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preparation example Construction

[0024] It can be seen from the background art that the methods for realizing the gradient change of the density of the absorbing material in the prior art are very cumbersome. The inventors of the present invention conduct research on the above-mentioned problems, and provide a preparation method of a wave-absorbing material, such as figure 1 As shown, it includes the following steps: S1, compressing the composite material containing the wave-absorbing material and the organic porous polymer, so that the composite material is in a compressed state; S2, performing heat treatment on one side of the composite material in the compressed state, Perform heat dissipation treatment on the surface on the other side opposite to the surface on one side; S3, release the compressed state of the composite material.

[0025] The preparation method prepares a composite material by preparing nanoparticles with electromagnetic wave absorption characteristics and an organic porous polymer, and c...

Embodiment 1

[0038] The preparation method of the absorbing material provided in this embodiment comprises the following steps:

[0039] Using the silver sol prepared by silver nanoparticles, the polyurethane sponge is immersed in the silver sol to absorb the colloidal solution, and the polyurethane sponge is placed in an oven at 80°C for drying treatment to obtain the silver nanoparticle / polyurethane composite material; the first made of aluminum The heat conduction plate and the second heat conduction plate clamp the above-mentioned composite material, apply pressure to reduce the distance between the first heat conduction plate and the second heat conduction plate, so as to compress the composite material to 1 / 4 of the original thickness, and fix it by bolts; then , put the first heat conduction plate in contact with the heat plate at 110°C, and the second heat conduction plate in contact with the radiator, heat treatment for 20 minutes to form a temperature gradient in the composite mat...

Embodiment 2

[0041] The difference between the preparation method of patterned graphene provided in this embodiment and embodiment 1 is:

[0042] reducing the distance between the first heat conducting plate and the second heat conducting plate to compress the composite material to 1 / 3 of the original thickness;

[0043] The first heat conduction plate is in contact with a 120°C heat plate, the second heat conduction plate is in contact with a heat sink, and heat treated for 2 hours to form a temperature gradient in the composite material.

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Abstract

The invention provides a wave-absorbing material and a preparation method thereof. The preparation method comprises the following steps: S1. carrying out compression treatment on a composite material containing a wave-absorbing material and an organic porous polymer so that the composite material is in the compressed state; S2. carrying out heating treatment on one side surface of the compressed-state composite material, and carrying out heat dissipation treatment on the opposite side surface; and S3. releasing the compressed state of the composite material. The preparation method can be used for preparing the composite material with simple particle density and gradient change characteristic, and can implement the control on the concentration gradient by regulating the amount of compression of the composite material. The composite material prepared by the preparation method has very high electromagnetic wave absorption characteristic, greatly lowers the electromagnetic wave reflection, and thus, is an electromagnetic-wave-absorbing material with excellent properties.

Description

technical field [0001] The invention relates to the field of material technology, in particular to a wave-absorbing material and a preparation method thereof. Background technique [0002] With the rapid development of electronic information technology, electromagnetic waves appearing in the surrounding space are becoming more and more diverse. In order to avoid the mutual interference between electronic devices and the impact on human health, wave-absorbing materials are used in the field of electronic technology and human body protection. has important applications. [0003] Since the absorbing material needs to obtain the maximum electromagnetic absorption while reducing the reflection of electromagnetic waves, it is usually difficult for the absorbing material with conventional structures to meet its requirements. In the prior art, the wave-absorbing material with a multi-layer structure is usually constructed, and the electrical characteristics of each layer of materia...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L75/04C08K3/08C08J7/00
CPCC08J7/08C08J2375/04C08K3/08C08K2003/0806C08K2201/011C08L75/04
Inventor 张大勇金智史敬元彭松昂
Owner INST OF MICROELECTRONICS CHINESE ACAD OF SCI