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Preparation method of dual-layer wave absorbing material adopting hollow structure

A hollow structure, wave absorbing material technology, applied in chemical instruments and methods, other chemical processes, etc., can solve the problems of immutability, limited wave frequency absorption range, instability, etc., to increase the absorption width, excellent wave absorption performance, The effect of saving production costs

Inactive Publication Date: 2016-09-21
丁玉琴
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The main technical problem to be solved by the present invention is to provide a double-layer hollow structure microwave absorbing material for the problem that the wave frequency absorption width and the fixed absorption peak position of the existing wave absorbing materials are limited, resulting in a limited range of wave frequency absorption. The preparation method of the material, the present invention generates ammonia gas and acetaldehyde through the reaction of hexamethylenetetramine, and after the ammonia gas evaporates to form bubbles, the viscosity of ethylene glycol and the adsorption of polyvinylpyrrolidone make the bubbles become Aggregation centers, driven by the minimization of interfacial energy and magnetic dipole interactions, make unstable crystalline nanoparticles gather around the gas-liquid interface. When the surface energy and binding energy are balanced, the bubbles are left inside the aggregate. And form a hollow spherical structure, prepare hollow ferric iron tetroxide, and blend it with attapulgite clay powder by ball milling, and coat a layer of nickel-cobalt on the composite powder by ultrasonic chemical plating, so as to prepare a The double-layer hollow structure absorbing material can change the wave frequency absorption width and fix the absorption peak position, and has broad market prospects

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0020] First, weigh 120g of attapulgite clay, 35g of sodium pyrophosphate, add 850mL of deionized water, stir and mix evenly, put them into a ball mill jar, mill them in a planetary ball mill at 300r / min for 4h, take them out, and transfer them to a centrifuge for centrifugation Separate and dry the precipitate in a drying oven at 60°C for 2 hours to obtain purified attapulgite clay powder, which is set aside; then measure 500mL of ethylene glycol, add 135g of ferric chloride, 28g of hexamethylenetetramine, and 50g of polyethylene Pyrrolidone, stirred at 500r / min to a transparent solution, put the solution into a high-pressure reactor, heated to 200°C and kept the temperature for 10h, cooled naturally to room temperature, transferred to a centrifuge for centrifugation, and deionized water and anhydrous Wash with water and ethanol in an ultrasonic cleaner for 3 times, place in a vacuum drying oven at 60°C for 6 hours to obtain hollow iron ferric oxide; then weigh 80g of the abov...

example 2

[0023] First, weigh 135g of attapulgite clay and 38g of sodium pyrophosphate, add it to 865mL of deionized water, stir and mix evenly, put it into a ball mill jar, mill it in a planetary ball mill at 350r / min for 4.5h, take it out, and transfer it to a centrifuge Centrifuge and dry the precipitate in a drying oven at 65°C for 2.5 hours to obtain purified attapulgite clay powder for later use; then measure 650mL of ethylene glycol, add 138g of ferric chloride, 29g of hexamethylenetetramine, and 53g Stir polyvinylpyrrolidone at 550r / min to a transparent solution, add the solution into a high-pressure reactor, heat to 225°C and keep the temperature for 11h, naturally cool to room temperature, transfer to a centrifuge for centrifugation, and deionized water and anhydrous ethanol in an ultrasonic cleaning apparatus for oscillating cleaning 4 times, and placed in a vacuum drying oven at 65°C for 7 hours to obtain hollow ferric oxide; then weigh 90 g of the above hollow ferric oxide a...

example 3

[0026]First, weigh 150g of attapulgite clay, 40g of sodium pyrophosphate, add 880mL of deionized water, stir and mix evenly, put it into a ball mill jar, mill it in a planetary ball mill at 400r / min for 5h, take it out, and transfer it to a centrifuge for centrifugation Separate and dry the precipitate in a drying oven at 70°C for 3 hours to obtain purified attapulgite clay powder for later use; then measure 800mL of ethylene glycol, add 140g of ferric chloride, 30g of hexamethylenetetramine, and 55g of polyethylene Pyrrolidone, stirred at 600r / min to a transparent solution, put the solution into a high-pressure reactor, heated to 250°C and kept the temperature for 12h, cooled naturally to room temperature, transferred to a centrifuge for centrifugation, and deionized water and anhydrous Water and ethanol were shaken and cleaned for 5 times in an ultrasonic cleaner, and placed in a vacuum drying oven at 70°C for 8 hours to obtain hollow ferric oxide; then weigh 100g of the abov...

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Abstract

The invention discloses a preparation method of a dual-layer wave absorbing material adopting a hollow structure, and belongs to the technical field of preparation of the wave absorbing material. The dual-layer wave absorbing material adopting the hollow structure, disclosed by the invention, is prepared through the following steps: generating ammonia and acetic aldehyde through a hexamethylene tetramine reaction; after the ammonia is evaporated to form bubbles, enabling the bubbles to become a polymerization center under the combined action of the stickiness of ethanediol and the adsorption of polyvinylpyrrolidone, and then enabling unstable crystal nanometer particles to be gathered around a gas-liquid interface through the minimization of interface energy and the driving of the interaction of magnetic dipoles; when surface energy and binding energy are balanced, enabling the bubbles to stay in an aggregate to form a hollow ball structure, so as to prepare hollow ferroferric oxide; performing ball milling and blending on the hollow ferroferric oxide and attapulgite clay powder, and plating a layer of nickel-cobalt on composite powder by a sonochemistry plating method, so that the dual-layer wave absorbing material adopting the hollow structure is obtained. Examples prove that the absorption width of wave frequency and the position of absorption peaks can be changed through the wave absorbing material, besides, the preparation method is simple and easy to operate, and the wave absorbing material has excellent wave absorbing properties.

Description

technical field [0001] The invention discloses a preparation method of a double-layer hollow structure wave-absorbing material, belonging 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, airplane flights are delayed due to electromagnetic wave interference; in hospitals, mobile phones often interfere with the normal work of various electronic medical instruments. Electromagnetic radiation causes direct and indirect damage to the human body through thermal effects, non-thermal effects, and cumulative effects. Therefore, to control electromagnetic pollution and electromagnetic radiation, and to find a material that can resist and weaken electromagnetic radiation—wave-absorbing materials has become a major topic in material science. [0003] Absorbing materials refer to a class of materials th...

Claims

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Application Information

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IPC IPC(8): C09K3/00
CPCC09K3/00
Inventor 丁玉琴王龙薛蕾
Owner 丁玉琴
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