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Graphite-doped poly-schiff base/ferrite composite stealth material

A poly-Schiff base and stealth material technology, applied in the direction of inorganic material magnetism, other chemical processes, chemical instruments and methods, etc., can solve the problems of high density, insufficient bonding strength between coating and substrate, narrow absorption frequency band, etc., and achieve preparation The process is simple, the preparation cost is low, and the effect of absorption frequency bandwidth

Inactive Publication Date: 2013-12-11
NANCHANG HANGKONG UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002]A wave-absorbing material refers to a class that can absorb the electromagnetic wave energy projected onto its surface, and convert the electromagnetic wave energy into heat energy or other forms of energy through the dielectric loss of the material Materials, absorbing materials generally require high absorption, wide frequency bandwidth, light weight and stable structural performance in the environment used. Commonly used absorbing materials mainly include: ferrite, metal powder, semiconductor materials, conductive polymers , carbon black, polycrystalline iron fiber, etc. At present, the traditional stealth coatings at home and abroad still take strong absorption as the main goal, and there are a large number of outstanding problems to be solved. The narrow absorption bandwidth cannot resist the comprehensive reconnaissance of wide-band radar waves. The wave efficiency is low, thin coatings cannot meet the requirements of wave absorption, and thick coatings greatly increase the weight of the system, which affects the mobility of the system, and the bonding strength between the coating and the substrate is insufficient, and it is easy to fall off
The publication number is CN200510060803.7, which is a Chinese patent document titled an electromagnetic wave absorbing material, which discloses a polymer composite material compounded by blending a polymer matrix and an electromagnetic wave absorbing agent, and its composite effect is better than that of a single The material is good, but the best performance is also the reflectivity above -8dB in the range of 8-10GHz, the absorbing effect is general and the absorbing frequency band is narrow; the publication number is CN101853727A, which is called an iron-graphite composite electromagnetic wave absorber The Chinese patent document of the material and its preparation method discloses an iron-graphite composite electromagnetic wave absorbing material, which is characterized in that nano-scale C is wrapped on the outside of iron nanoparticles to form a C film, and the material has a strong electromagnetic wave in the low frequency band absorption, but its shortcomings are also more obvious, mainly because the thickness is relatively large, the frequency band is narrow and the density is large; the publication number is CN101045533A, a Chinese patent document named as a graphite absorbing material with magnetic alloy particles on the surface and its preparation method, which discloses Use related metal salts and graphite to make related composite materials in electroless plating solution. This material has a reflectivity above -8dB at 6-8GHz, and has both excellent electrical conductivity and soft magnetic properties, but its absorption frequency band is too narrow And the chemical plating solution is easy to pollute the environment

Method used

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  • Graphite-doped poly-schiff base/ferrite composite stealth material
  • Graphite-doped poly-schiff base/ferrite composite stealth material
  • Graphite-doped poly-schiff base/ferrite composite stealth material

Examples

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Effect test

Embodiment 1

[0020] Take 0.2mol of p-phenylenediamine and 0.2mol of glyoxal and dissolve them in 300ml of ethanol solution, then add 29.6g of graphite, and react with electromagnetic stirring at 25°C for 8h. The obtained product is filtered under reduced pressure, rinsed with ethanol for 2 to 3 times, dried and then sintered at 300° C. for 2 to 4 hours to obtain graphite-doped poly-Schiff base. Get the above-mentioned 24g graphite doped poly-Schiff base and 42.7g nanometer Fe 3 o 4 Mix evenly to obtain graphite-doped poly-Schiff base / ferrite composite cloaking material. The composite cloaking material is composed of graphite: 18%, poly-Schiff base: 18%, and the rest is ferrite. The composite cloaking material is blended with paraffin to prepare a compound, the composite cloaking material accounts for 50% by weight of the whole compound, and the rest is paraffin. The composite is coated on a standard aluminum plate of 18cm*18cm*2mm, with a thickness of 2mm, and its reflectivity is tested ...

Embodiment 2

[0022] Take 0.2mol of p-phenylenediamine and 0.2mol of glyoxal and dissolve in 300ml of ethanol solution, then add 19.7g of graphite, and react with electromagnetic stirring at 50°C for 9h. The obtained product is filtered under reduced pressure, rinsed with ethanol for 2 to 3 times, dried and then sintered at 300° C. for 2 to 3 hours to obtain graphite-doped poly-Schiff base. Get the above-mentioned 24g graphite doped poly-Schiff base and 56g nanometer Fe 3 o 4 Mix evenly to obtain graphite-doped poly-Schiff base / ferrite composite stealth material. The composite stealth material is composed of graphite: 12%, poly-Schiff base: 18%, and the rest is ferrite. The composite cloaking material is blended with paraffin to prepare a compound, the composite cloaking material accounts for 50% by weight of the whole compound, and the rest is paraffin. The composite is coated on a standard aluminum plate of 18cm*18cm*2mm, with a thickness of 2mm, and its reflectivity is tested according...

Embodiment 3

[0024] Take 0.2mol of p-phenylenediamine and 0.2mol of glyoxal and dissolve in 300ml of ethanol solution, then add 14.2g of graphite, and react with electromagnetic stirring at 50°C for 10h. The obtained product is filtered under reduced pressure, rinsed with ethanol for 2 to 3 times, dried and then sintered at 300° C. for 2 to 4 hours to obtain graphite-doped poly-Schiff base. Get the above 10g graphite doped poly-Schiff base and 40.9g nano Fe 3 o 4 Mix evenly to obtain graphite-doped poly-Schiff base / ferrite composite stealth material. The composite stealth material is composed of graphite: 12%, poly-Schiff base: 25%, and the rest is ferrite. The composite cloaking material is blended with paraffin wax to prepare a compound, the composite cloaking material accounts for 50% by weight of the whole compound, and the rest is paraffin wax. The composite is coated on a standard aluminum plate of 18cm*18cm*2mm, with a thickness of 2mm, and its reflectivity is tested according to ...

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Abstract

A graphite-doped poly-schiff base / ferrite composite stealth material is prepared by compounding graphite, poly-Schiff and ferrite, wherein the mass of the graphite accounts for 12 to 19 percent of that of the composite material, the mass of the poly-schiff accounts for 18 to 25 percent, and the residue is the nano ferrite. The material has excellent wave absorption property, also has advantages of wide absorption band, low cost, simpleness in preparation and low density, and has wide application prospect as an electromagnetic wave absorption material.

Description

technical field [0001] The invention relates to an electromagnetic wave absorbing material, in particular to a graphite-doped poly-Schiff base / ferrite composite stealth material. Background technique [0002] Absorbing material refers to a type of material that can absorb electromagnetic wave energy projected onto its surface, and convert the electromagnetic wave energy into heat energy or other forms of energy through the dielectric loss of the material. The absorbing material generally requires high absorption, wide frequency bandwidth, and light weight. As well as the characteristics of stable structure and performance in the environment used, the commonly used wave-absorbing materials mainly include: ferrite, metal powder, semiconductor materials, conductive polymers, carbon black, polycrystalline iron fibers, etc. At present, domestic and foreign traditional The main goal of stealth coatings is strong absorption, and there are a large number of outstanding problems to b...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K3/00H01F1/34
Inventor 刘崇波刘辉林徐荣臻
Owner NANCHANG HANGKONG UNIVERSITY