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Preparation method of yolk type double-shell-layer hollow composite wave absorption material

A composite wave-absorbing material and double-shell technology, applied in metal material coating process, coating, liquid chemical plating, etc., can solve the problem that the electromagnetic parameters are difficult to meet the relative permittivity and relative permeability Thin thickness, light weight and other problems, to achieve the effect of reducing quality, easy operation, and broadening the wave-absorbing frequency band

Active Publication Date: 2018-07-27
SHAANXI UNIV OF SCI & TECH
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Problems solved by technology

Fe 3 o 4 It is a kind of magnetic ferrite with anti-spinel structure. In the incident microwave band, it can generate both magnetic loss and electrical loss for electromagnetic waves. It is a double-complex dielectric material, but it is difficult to meet its electromagnetic parameters. The principle that the relative permittivity and relative permeability are as close as possible, so a single Fe 3 o 4 It is difficult to meet the requirements of thin thickness, light weight, frequency bandwidth and strong wave absorption

Method used

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  • Preparation method of yolk type double-shell-layer hollow composite wave absorption material
  • Preparation method of yolk type double-shell-layer hollow composite wave absorption material
  • Preparation method of yolk type double-shell-layer hollow composite wave absorption material

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preparation example Construction

[0029] A method for preparing an egg yolk-shaped double-shell hollow composite wave-absorbing material, comprising the following steps:

[0030] (1) First add iron salt into the solvent, ultrasonically dissolve it completely, then add alkali, continue ultrasonically disperse to make it evenly dispersed, then transfer the above mixed solution to a high-temperature reaction kettle, react at a certain temperature for a certain period of time, and finally Separation by magnetic decantation and washing with absolute ethanol, the product can be obtained after vacuum drying 3 o 4 Nanoparticles.

[0031] Iron salt can be FeCl in described step (1) 3 ·6H 2 O, Fe 2 (SO 4 ) 3 9H 2 O, Fe(NO 3 ) 3 9H 2 O, FeCl 2 4H 2 O, FeSO 4 ·7H 2 O, Fe(NO 3 ) 2 ·6H 2 O et al.

[0032] The solvent may be deionized water, alcohols (methanol, ethanol, ethylene glycol, glycerol, etc.), ketones (acetone, methyl ethyl ketone, etc.) and the like.

[0033] The base may be ammonia water, ethyl...

Embodiment 1

[0041] (1) First, 2.703g FeCl 3 ·6H 2 O was added to 60mL of ethylene glycol, sonicated for 15min to completely dissolve it, then 4mL of ethylenediamine was added, and the ultrasonic dispersion was continued for 30min to disperse evenly, then the above mixed solution was transferred to a high-temperature reactor, and reacted at 200°C for 12h , and finally separated by magnetic decantation and washed with absolute ethanol, the product can be obtained after vacuum drying 3 o 4 Nanoparticles, see figure 1 , hollow Fe 3 o 4 The nanoparticles have a particle size of about 400 nm and a wall thickness of about 100 nm.

[0042] (2) take by weighing the hollow Fe obtained in 0.5g step (1) 3 o 4 Nanoparticles were dispersed in 150 mL of deionized water, and 20 mmol of ferrous chloride tetrahydrate (FeCl 2 4H 2 O), 20mmol of cobalt chloride hexahydrate (CoCl 2 ·6H 2 (2) and 0.3mol of trisodium citrate as solution A; in addition, 40mL of 50% hydrazine hydrate and 2mol of sodium...

Embodiment 2

[0047] (1) First, 2.809g Fe 2 (SO 4 ) 3 9H 2 O was added to 60mL of deionized water, sonicated for 15min to dissolve completely, followed by adding 4mL of ethylenediamine, and continued to disperse ultrasonically for 30min to disperse evenly, then transferred the above mixed solution to a high-temperature reactor, and reacted at 200°C for 12h. Finally, it is separated by magnetic decantation and washed with absolute ethanol, and the product can be obtained after vacuum drying. 3 o 4 Nanoparticles (particle size about 500nm, wall thickness about 100nm).

[0048] (2) Take by weighing the hollow Fe obtained in 0.1g step (1) 3 o 4 Nanoparticles were dispersed in 150mL deionized water, and 12mmol of FeCl was added 2 4H 2 O, 28mmol of CoCl 2 ·6H 2 O and 0.3mol of trisodium citrate, as solution A; another 40mL of 50% hydrazine hydrate and 2mol of sodium hydroxide were dispersed in 90mL of deionized water, as solution B; solution B was added dropwise to solution A while stir...

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Abstract

The invention provides a preparation method of a yolk type double-shell-layer hollow composite wave absorption material. A double-shell-layer hollow composite microsphere is used as a template; a transition layer covers the surface; the multi-shell-layer hollow composite microsphere is obtained; the multi-shell-layer hollow composite microsphere is used as a template; a dielectric layer with a dielectric loss function covers the surface; then, the transition layer is removed to obtain the yolk type double-shell-layer hollow composite wave absorption material. The prepared material is a composite wave absorption material with strong wave absorption, wide frequency band and light weight; the magnetic loss and the electric loss are integrated; the wave absorption performance of the compositematerial is enhanced; the wave absorption frequency band of the composite material is widened; in addition, the unique yolk hollow double-space structure is realized, so that the composite material has the lower density and lighter weight on the basis of maintaining the excellent wave absorption performance; the requirements of strong wave absorption, wide frequency band and light weight of the modern wave absorption material can be met.

Description

technical field [0001] The invention specifically relates to a preparation method of an egg yolk-shaped double-shell hollow composite wave-absorbing material, which belongs to the technical fields of micro-nano materials, electromagnetic wave absorption, and the like. Background technique [0002] With the rapid development of electronic technology, electromagnetic radiation continues to increase, resulting in serious electromagnetic pollution, causing certain harm to the environment and human health; Materials are also widely used in military affairs, so the research on absorbing materials has been paid more and more attention. [0003] Ferrite absorbing material is the most widely studied absorbing material, ferrite tetroxide (Fe 3 o 4 ) is its typical representative. Fe 3 o 4 It is a kind of magnetic ferrite with anti-spinel structure. In the incident microwave band, it can generate both magnetic loss and electrical loss for electromagnetic waves. It is a double-comp...

Claims

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Application Information

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IPC IPC(8): C23C18/08C23C18/12H05K9/00
CPCH05K9/0081C23C18/08C23C18/1204C23C18/1216C23C18/1225
Inventor 鲍艳李帅刘超马建中张文博董雨菲
Owner SHAANXI UNIV OF SCI & TECH
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