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Preparation method for foamed aluminum modified polyaniline composite wave-absorbing material

A composite wave-absorbing material and aluminum foam technology, applied in chemical instruments and methods, and other chemical processes, can solve the problems of narrow effective wave-absorbing frequency band, narrow effective wave-absorbing frequency band, and unsatisfactory wave-absorbing performance of wave-absorbing materials, etc. Achieve good use prospects, good absorbing performance, and change the position of the absorption peak

Inactive Publication Date: 2017-05-31
TRUSYN CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem mainly solved by the present invention is to solve the defects that traditional wave-absorbing materials cannot change the wave-frequency absorption width and fixed absorption peak position, and the effective wave-absorbing frequency band of the wave-absorbing material is narrow, and the wave-absorbing performance is not ideal. A light-weight, wave-absorbing closed-cell aluminum foam is used as the core, and a doped-type wave-absorbing polymer is wrapped on the outside to prepare a foam-modified polyaniline composite wave-absorbing material. In the present invention, calcium carbonate, aluminum powder and tin oxide are first After mixing, use magnesium strips as an ignition agent to cause the aluminum powder to undergo a thermite reaction to produce alumina, and then mix and foam the alumina and foaming agent to obtain foamed aluminum, which has light weight and good electromagnetic shielding Performance, and then use aniline as raw material through polymerization reaction, wrap a layer of polyaniline doped with inorganic acid on the outside of aluminum foam, polyaniline uses electric polarization to consume electromagnetic wave energy, aluminum foam and polyaniline have different absorbing frequency bands, It can increase the wave-absorbing width, and when the electromagnetic wave passes through the polymer layer and reaches the interior of the aluminum foam, the pores inside the aluminum foam can repeatedly refract and absorb electromagnetic waves to achieve the purpose of wave absorption, and finally centrifuge and dry to obtain the wave-absorbing material. The wave-absorbing material prepared by the invention can change the wave-frequency absorption width, adjust the position of the absorption peak, and solve the problems of the traditional wave-absorbing material having a narrow effective wave-absorbing frequency band and unsatisfactory wave-absorbing performance, and has a good application prospect

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0018] First weigh 20g of calcium carbonate and add it to the pulverizer, pulverize it for 20 minutes, pass through a 100-mesh sieve, collect the sieved material, add the sieved material to the beaker, then add 200g aluminum powder and 100g tin oxide to the beaker, stir and mix After 15 minutes, the mixed powder was obtained; then 40 g of the above mixed powder and 2 g of potassium chlorate were added to a three-necked flask, and the flask was placed in a sand bath, and the heating rate was controlled to be 15 °C / min, and the temperature was raised to 350 °C, and then 3 mL / min After feeding nitrogen into the flask at a rate of 10 minutes, stop feeding nitrogen, let it stand for 3 minutes, take 3 g of magnesium bars, ignite them and put them into the flask to burn the magnesium bars in nitrogen. Foaming base material; then add the above foaming base material and protein powder into the mold according to the mass ratio of 50:1, control the mold temperature to 450°C, extrude for 2...

example 2

[0021] First weigh 25g of calcium carbonate and add it to the pulverizer, pulverize it for 23 minutes, pass through a 110-mesh sieve, collect the sieved material, add the sieved material into the beaker, then add 250g of aluminum powder and 110g of tin oxide into the beaker, stir and mix After 18 minutes, the mixed powder was obtained; then 45 g of the above mixed powder and 2 g of potassium chlorate were added to a three-necked flask, and the flask was placed in a sand bath, and the heating rate was controlled to be 18 °C / min, and the temperature was raised to 375 °C, and then 4 mL / min After feeding nitrogen into the flask at a rate of 13 minutes, stop feeding nitrogen, let stand for 4 minutes, take 4 g of magnesium bars, put them into the flask after being ignited, and make the magnesium bars burn in nitrogen. Foaming base material; then add the above foaming base material and protein powder into the mold according to the mass ratio of 50:1, control the mold temperature to 47...

example 3

[0024] First weigh 30g of calcium carbonate and add it to the pulverizer, pulverize it for 25 minutes, pass through a 120 mesh sieve, collect the sieved material, add the sieved material into the beaker, then add 300g of aluminum powder and 120g of tin oxide into the beaker, stir and mix After 20 minutes, the mixed powder was obtained; then 50 g of the above mixed powder and 3 g of potassium chlorate were added to a three-necked flask, and the flask was placed in a sand bath, and the heating rate was controlled to be 20 °C / min, and the temperature was raised to 400 °C. After feeding nitrogen into the flask at a rate of 15 minutes, stop feeding nitrogen, let it stand for 5 minutes, take 5 g of magnesium bars, ignite them and put them into the flask to burn the magnesium bars in nitrogen. Foaming base material; then add the above foaming base material and protein powder into the mold according to the mass ratio of 50:1, control the mold temperature to 500°C, extrude for 30 minute...

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Abstract

The invention discloses a preparation method for a foamed aluminum modified polyaniline composite wave-absorbing material, and belongs to the technical field of wave-absorbing material preparation. The preparation method comprises the following steps: mixing calcium carbonate, aluminum powder and tin oxide; performing a thermit reaction on powdered aluminum by taking a magnesium rod as an igniter to generate aluminum oxide; mixing the aluminum oxide with a foaming agent for foaming to obtain foamed aluminum, wherein the foamed aluminum has light weight and high electromagnetic shielding performance; coating the outside of the foamed aluminum with a layer of polyaniline doped with inorganic acid by performing a polymerization reaction on aniline serving as a raw material. The foamed aluminum and the polyaniline are different in wave absorbing frequency bands, so that the wave absorbing width can be increased; moreover, after electromagnetic waves pass through a polymer layer and reach the inside of the foamed aluminum, the electromagnetic waves can be refracted and adsorbed repeatedly by a plurality of holes inside the foamed aluminum, and the aim of the absorbing waves is fulfilled. The wave absorbing material prepared by the method can be used for changing the absorbing width of the waves and adjusting the position of an absorbing peak, and has a good application prospect, and the problems of narrow effective wave-absorbing frequency band and undesirable wave absorbing performance are solved.

Description

technical field [0001] The invention discloses a method for preparing a foam aluminum modified polyaniline composite wave-absorbing material, which belongs to the technical field of wave-absorbing material preparation. Background technique [0002] With the development of modern science and technology, the impact of electromagnetic radiation on the environment is increasing. At airports and airplanes, flights are delayed due to electromagnetic wave interference. In hospitals and mobile phones, they often interfere with the normal work of various electronic medical instruments. In addition, electromagnetic radiation can cause direct and indirect damage to the human body through thermal effects, non-thermal effects, and cumulative effects. harm. Therefore, to control electromagnetic pollution and electromagnetic radiation, and to find a kind of absorbing material that can resist and weaken electromagnetic radiation has become a major issue in material science. [0003] A wav...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G73/02C08K7/24C08K5/544C09K3/00
CPCC08G73/0266C08K5/544C08K7/24C08L2203/14C09K3/00
Inventor 王维孙冬林晨
Owner TRUSYN CHEM TECH
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