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A kind of lightweight porous wave-absorbing film and preparation method thereof

An absorbing film, lightweight technology, applied in chemical instruments and methods, other chemical processes, etc., can solve the problems of high surface density, insufficient bending, and high thickness of absorbing film

Active Publication Date: 2017-10-20
柔电(武汉)科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, the absorbing films prepared by the above two methods still face the problem of high surface density (>2kg / m 2 ), insufficient bending, too high thickness (>1mm) and many other problems

Method used

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  • A kind of lightweight porous wave-absorbing film and preparation method thereof
  • A kind of lightweight porous wave-absorbing film and preparation method thereof
  • A kind of lightweight porous wave-absorbing film and preparation method thereof

Examples

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Effect test

example 1

[0037] The mass ratio of Fe-Si-Al powder to nanocellulose is 75:25, and the surface density of the prepared wave-absorbing film is 0.4kg / m 2 . The nanocellulose is fully stirred and dispersed in isopropanol, and the volume ratio of the nanocellulose mass to the used isopropanol is 1 mg / ml; the wave-absorbing material is added to the dispersed nanocellulose solution, and the second stirring is carried out to To achieve overall homogenization; then transfer to the filter for vacuum filtration; after the filtration is completed, place it under normal temperature and pressure conditions to allow the residual isopropanol inside the membrane to volatilize naturally. The absorbing membrane can be easily transferred from the filter membrane after drying. The wave absorption test curve of the obtained lightweight wave-absorbing film is as follows figure 1 shown. After testing, it can effectively absorb electromagnetic waves with a frequency of 8--12GHz, and its porosity is 50%. The...

example 2

[0039] The mass ratio of Fe-Si-Al powder to fibrillated polyethylene fiber is 90:10, and the surface density of the prepared wave-absorbing film is 0.8kg / m 2 , the fibrillated polyethylene fiber is fully stirred and dispersed in absolute ethanol, and the volume ratio of the quality of the fibrillated polyethylene fiber to the isopropanol used is 1mg / ml; In the vinyl fiber solution, carry out secondary stirring to achieve overall homogenization; then transfer it to a filter for high-pressure filtration; place it in a vacuum oven at 120°C for drying after completion of pressure filtration. The absorbing membrane can be easily transferred from the filter membrane after drying. After testing, it can effectively absorb electromagnetic waves with a frequency of 6--14GHz, its porosity is 50%, and the surface density of the absorber is lower than 2kg / m 2 . The tensile strength reaches 7MPa.

example 3

[0041] The mass ratio of Fe-Si-Al powder to nanocellulose and fibrillated polyethylene fiber is 75:15:10, and the surface density of the prepared wave-absorbing film is 1.6kg / m 2 , the nanocellulose and fibrillated polyethylene fibers are fully stirred and dispersed in water, and the volume ratio of the nanocellulose and fibrillated polyethylene to the isopropanol used is 0.25 mg / ml respectively; wave absorbing agent is added to disperse In the good nanocellulose and fibrillated polyethylene fiber solution, carry out secondary stirring to achieve overall homogenization; then transfer to the filter for vacuum filtration; filter the initial product and place it under normal temperature and pressure conditions, so that the membrane body The isopropanol remaining inside will evaporate naturally. The absorber membrane can be easily transferred from the filter membrane after drying. The cross-sectional electron microscope image of the obtained wave-absorbing film is shown in imag...

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Abstract

The invention discloses a lightweight porous wave-absorbing film and a preparation method thereof. The light-weight porous wave-absorbing film includes fiber materials and wave-absorbing materials with a fibrillated structure. The fiber materials are in a three-dimensional cross-linked structure. The wave-absorbing material is dispersed in the three-dimensional cross-linked structure, and the mass proportion of the wave-absorbing material in the lightweight porous wave-absorbing film is 50-90%. The preparation method includes the steps of dispersing, homogenizing, filtering, baking and rolling. The invention adopts a wet papermaking process, and the wave-absorbing material is evenly distributed in the film-shaped wave-absorbing body. The preparation method has few steps and low cost, and the prepared wave-absorbing film has the surface density of the wave-absorbing body lower than 2kg / m2 and the porosity not lower than 30% under the premise of achieving the same wave-absorbing efficiency.

Description

technical field [0001] The invention relates to electromagnetic radiation absorption and shielding treatment technology and related materials, in particular to a preparation method of a lightweight porous wave-absorbing film and its products. Background technique [0002] With the rapid development of electronic technology, people are exposed to more and more electromagnetic radiation in their daily life. At the same time, in order to meet the needs of modern warfare, stealth materials are widely used in weapons. Therefore, the research on absorbing materials has important practical value. my country has started research on wave-absorbing materials and electromagnetic wave absorbers since the 1980s, and entered a relatively comprehensive research stage in the mid-to-late 1990s. Although domestic research on wave-absorbing materials has made good progress in some aspects and formed its own characteristics, most of its research focuses on the research of certain wave-absorbing...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L1/02C08L23/06C08L77/10C08L33/20C08K3/08C08K3/02C08K3/22C08K7/10C08K7/24C08J5/18C09K3/00
Inventor 李贝孙兵扬解明
Owner 柔电(武汉)科技有限公司
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