Structural wave absorbing material and preparation method thereof

A wave absorbing material and wave absorbing layer technology, applied in the field of wave absorbing materials, can solve the problems of non-compliance with environmental protection and sustainable development, high volatile organic compound emission, long cycle, etc., and achieve simple structure, simple process, and processing handy effect

Inactive Publication Date: 2017-05-31
AEROSPACE SCI & IND WUHAN MAGNETISM ELECTRON +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, this preparation method has a long cycle, low efficiency, and a large amount of solvent-based coatings are used, resulting in the emission of high volatile organic compounds VOC, which does not meet the requirements of environmental protection and sustainable development.

Method used

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Examples

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Effect test

preparation example Construction

[0028] The present invention also provides a preparation method of the above structure absorbing material, comprising the following steps:

[0029] S1: Prepare polymer resin and conductive carbon black, polymer resin and absorbent, polymer resin and chopped carbon fiber according to a certain ratio;

[0030] S2: Put polymer resin and conductive carbon black, polymer resin and absorbent, polymer resin and chopped carbon fiber into a high-speed mixer and mix evenly to obtain materials for making impedance matching layer, wave-absorbing layer and reflective layer respectively ;

[0031] S3: The polymer resin material and the uniformly mixed material are separately put into the multi-layer co-extrusion extruder, and the wave-transmitting layer, the impedance matching layer, the wave-absorbing layer and the reflection layer are respectively formed by adopting the multi-layer co-extrusion processing layer, and compound it into a structural absorbing material.

[0032] The multi-la...

Embodiment 1

[0035] According to the performance requirements of the absorbing structural plate, the total thickness of the designed structural absorbing material is 4mm, of which the thickness of the wave-transmitting layer is 1mm, the thickness of the impedance matching layer is 0.5mm, the thickness of the absorbing layer is 2mm, and the thickness of the reflective layer The thickness is 0.5mm. The composition of the wave-transmitting layer is a PA11 resin layer, the composition of the impedance matching layer is a blend of 5 parts by mass of conductive carbon black and 95 parts by mass of PA11 resin, and the composition of the wave-absorbing layer is 65 parts by mass of carbonyl iron powder and 35 parts by mass of PA11 The components of the resin blend and the reflective layer are 15 parts by mass of chopped carbon fiber and 85 parts by mass of PA11 resin blend.

[0036] In the preparation method of the wave-absorbing material with this structure, the temperature of the conveying sectio...

Embodiment 2

[0039] According to the performance requirements of the absorbing structural plate, the total thickness of the designed structural absorbing material is 10mm, of which the thickness of the wave-transmitting layer is 4mm, the thickness of the impedance matching layer is 1mm, the thickness of the absorbing layer is 4mm, and the thickness of the reflective layer 1mm. The wave-transmitting layer is composed of a PA6 resin layer, the impedance matching layer is a blend of 20 parts by mass of conductive carbon black and 80 parts by mass of PA6 resin, and the composition of the wave-absorbing layer is 85 parts by mass of ferrite powder and 15 parts by mass of ferrite powder. The PA6 resin blend and the reflective layer are composed of 50 parts by mass of chopped carbon fiber and 50 parts by mass of PA6 resin blend.

[0040]In the preparation method of the wave-absorbing material with this structure, the temperature of the conveying section of the twin-screw extruder corresponding to ...

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Abstract

The invention discloses a structural wave absorbing material, and relates to the technical field of wave absorbing materials. The structural wave absorbing material is a multilayer composite wave absorbing material which is formed by combining a wave transmission layer, an impedance matching layer, a reflection layer and at least one wave absorbing layer; the wave transmission layer consists of macromolecular resin; the impedance matching layer consists of macromolecular resin and conductive carbon black; the wave absorbing layers consist of macromolecular resin and adsorbents; the reflection layer consists of macromolecular resin and short carbon fiber. The structural wave absorbing material disclosed by the invention is formed by combining the wave transmission layer, the impedance matching layer, the reflection layer and the at least one wave absorbing layer, so that no coating is used, and the structural wave absorbing material is healthy and environment-friendly; the environmental pollution can be relieved; furthermore, the structural wave absorbing material is simple in structure and convenient to process.

Description

technical field [0001] The invention relates to the technical field of wave-absorbing materials, in particular to a structural wave-absorbing material and a preparation method thereof. Background technique [0002] Electromagnetic wave absorber is a functional composite material that can effectively absorb incident electromagnetic waves and significantly reduce echo intensity. It has important applications in the fields of military stealth, civilian electromagnetic protection and anti-electromagnetic interference. At present, more mature absorbing material structures include Salisbury screen, Dallenbach screen, Jaumann absorber, multi-layer matching structure, etc. Among them, the Salisbury absorber has a narrow absorption frequency band; the Dallenbach absorber is limited by the dispersion effect of the electromagnetic parameters of the current material, and it is difficult to achieve broadband absorption; the Jaumann absorber has a simple design and a wide absorption frequ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B27/06B32B27/18H05K9/00B29C47/06B29K105/00
CPCB29K2105/0023B32B27/06B32B27/18B29C48/0013B29C48/18H05K9/0088
Inventor 危伟谌希岳永威徐启丁铁伢王锦毛晶晶
Owner AEROSPACE SCI & IND WUHAN MAGNETISM ELECTRON
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