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A kind of preparation method and product of coated modified flake fesial absorbent

An absorber and sheet-like technology, which is applied in the field of functional material preparation, can solve problems such as poor matching of absorber electromagnetic parameters, uneven coating of absorber, narrow absorption frequency band, etc., and achieve excellent microwave absorption performance, good insulation performance, and preparation The effect of mild process conditions

Active Publication Date: 2019-04-19
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a preparation method and product of a coated modified sheet FeSiAl absorbent to solve the current problems of uneven coating of the absorbent, poor matching of the electromagnetic parameters of the absorbent, narrow absorption frequency band and low use frequency band.

Method used

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  • A kind of preparation method and product of coated modified flake fesial absorbent
  • A kind of preparation method and product of coated modified flake fesial absorbent

Examples

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Embodiment 1

[0022] A preparation method 1 of a coated modified flake FeSiAl absorbent of the present invention comprises the following steps:

[0023] In a 1 L four-neck flask equipped with a stirrer, reflux condenser, constant pressure dropping funnel, and thermometer, add 400 ml of n-butanol and xylene as a binary solvent with a mass ratio of 7:3, and 40 g of flaky FeSiAl magnetic powder and 1.3 ml of silane coupling agent, stirred at room temperature for 40 min;

[0024] Add 0.8 g of dimethyl azobisisobutyrate initiator through recrystallization treatment, and continue stirring at room temperature for 30 min;

[0025] The reaction device was evacuated, and high-purity argon was passed through, and this was repeated four times, and then the four-necked flask was always kept in an argon protection state;

[0026] Place the four-neck flask in a water bath and heat it to 70±1°C, slowly add 8 ml of styrene monomer that has been subjected to vacuum distillation by dropwise addition, and the...

Embodiment 2

[0032] A preparation method 2 of a coated modified flake FeSiAl absorber of the present invention comprises the following steps:

[0033] In a 1 L four-neck flask equipped with a stirrer, a reflux condenser, a constant pressure dropping funnel, and a thermometer, add 300 ml of n-butanol and xylene as a binary solvent with a mass ratio of 6:2, and 30 g of flaky FeSiAl magnetic powder and 0.9 ml silane coupling agent, stirred at room temperature for 40 min;

[0034] Add 0.5 g of azoisobutylcyanoformamide initiator through recrystallization treatment, and continue to stir at room temperature for 30 min;

[0035] The reaction device was evacuated, and high-purity argon was passed through, and this was repeated four times, and then the four-necked flask was always kept in an argon protection state;

[0036] Place the four-neck flask in a water bath and heat it to 70±1°C, slowly add 6 ml of styrene monomer that has been subjected to vacuum distillation by dropwise addition, and the...

Embodiment 3

[0040] A preparation method 3 of a coated modified flaky FeSiAl absorbent of the present invention comprises the following steps:

[0041] In a 1 L four-neck flask equipped with a stirrer, a reflux condenser, a constant pressure dropping funnel, and a thermometer, add 360 ml of n-butanol and xylene as a binary solvent with a mass ratio of 8:2, and 36 g of flaky FeSiAl magnetic powder and 1.1 ml titanate coupling agent, stirred at room temperature for 40 min;

[0042] Add 0.7 g of recrystallized dimethyl azobisisobutyrate, and continue stirring at room temperature for 30 min;

[0043] The reaction device was evacuated, and high-purity argon was passed through, and this was repeated four times, and then the four-necked flask was always kept in an argon protection state;

[0044] Place the four-neck flask in a water bath and heat it to 70±1°C, slowly add 7 ml of styrene monomer that has been subjected to vacuum distillation by dropwise addition, and the dropwise addition is comp...

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Abstract

The invention discloses a preparation method and a product for coating a modified flaky FeSiAl absorbent. The coating and modification process adopts the monomer polymerization method, and the uniform and complete modification of the flaky FeSiAl magnetic powder can be achieved by controlling the process conditions. The preparation process is as follows: (1) uniformly dispersing 10 to 15 parts of flaky FeSiAl magnetic powder and 0% 3 to 0.5 parts of coupling agent in 75 to 80 parts of binary solvents of alcohols and benzene and adding 0.1 to 0.3 part of azo initiator; (2) under the protection of inert gas, slowly adding 2 to 4 parts of styrene monomer to react at 70 to 75 temperatures for 5 to 7h; and (3) finally cooling, centrifuging and drying to obtain a surface coated with a layer of uniform dense polystyrene sheet like FeSiAl absorbent, the above parts being all by weight. The coated modified flaky FeSiAl absorbent prepared by the invention has good insulation property and excellent microwave absorption performance, and the obtained reflectivity is better than 10dB in the frequency band of 2-18GHz up to 7.48GHz; and the conditions for the preparation process are mild and convenient, and the efficiency is high, enabling the industrial production.

Description

technical field [0001] The invention belongs to the technical field of preparation of functional materials, and relates to a preparation method of a metal magnetic microwave absorber, in particular to a preparation method and a product of a coated modified flake FeSiAl absorber. Background technique [0002] Absorbing materials can convert incident electromagnetic wave energy into heat energy or other forms of energy to attenuate electromagnetic wave loss, which occupies an important position in the field of military stealth material technology; at the same time, it also has very important technical and practical value in the field of civilian electromagnetic compatibility (EMC) . In recent years, the research on absorbing materials at home and abroad has made great progress, but there are still some shortcomings such as poor matching of electromagnetic parameters, narrow absorption frequency band and low frequency band (~ GHz). [0003] Flake FeSiAl alloy powder is a kind ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H05K9/00
CPCH05K9/0081
Inventor 邓联文贺君廖聪维颜铄清黄生祥刘胜
Owner CENT SOUTH UNIV
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