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CNTs/Fe3O4/melamine composite carbon foam as well as preparation method and application thereof

A technology of melamine carbon and melamine, applied in the field of wave absorbing materials, can solve the problem of easy agglomeration of particles and the like

Active Publication Date: 2022-03-22
河北中煤旭阳能源有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Preparation of nano-Fe by co-precipitation method by mixing ferrous and ferric salts 3 o 4 particles, which is the preparation of nano-Fe 3 o 4 The most basic method for particles, but the Fe obtained by this method 3 o 4 Particles have the disadvantage of being easy to agglomerate, so how to improve Fe 3 o 4 Particle dispersion performance becomes the key issue to improve its electromagnetic shielding performance

Method used

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  • CNTs/Fe3O4/melamine composite carbon foam as well as preparation method and application thereof
  • CNTs/Fe3O4/melamine composite carbon foam as well as preparation method and application thereof
  • CNTs/Fe3O4/melamine composite carbon foam as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0096] A CNTs / Fe 3 o 4 The preparation method of melamine composite carbon foam comprises the following steps:

[0097] 1. Cut the melamine sponge into cuboids whose length, width and thickness are 90mm, 28mm and 20mm, respectively. Soak the cut sample in ethanol solution for 30 minutes and ultrasonically vibrate, wash it repeatedly three times, and wash off the attached impurities before use. Place the pre-washed melamine sponge in a quartz dish, then move it into a tube furnace, and place it in high-purity N 2 Under the protection of , the temperature was raised to 700 ° C at a rate of 2 ° C / min, and then the carbonization process was carried out in a tube furnace at a constant temperature for 2 h. After the reaction was completed, wait for the tube furnace to cool down to room temperature naturally, take out the carbon foam and ultrasonically wash it with ethanol solution for 30 minutes, and obtain the melamine-based carbon foam after drying.

[0098] 2. Weigh the fer...

Embodiment 2

[0105] A CNTs / Fe 3 o 4 The preparation method of melamine composite carbon foam comprises the following steps:

[0106] 1. Cut the melamine sponge into cuboids whose length, width and thickness are 90mm, 28mm and 20mm, respectively. Soak the cut sample in ethanol solution for 30 minutes and ultrasonically vibrate, wash it repeatedly three times, and wash off the attached impurities before use. Place the pre-washed melamine sponge in a quartz dish, then move it into a tube furnace, and place it in high-purity N 2 Under the protection of , the temperature was raised to 800 °C at a rate of 2 °C / min, and then the carbonization process was carried out in a tube furnace at a constant temperature for 2 h. After the reaction was completed, wait for the tube furnace to cool down to room temperature naturally, take out the carbon foam and ultrasonically wash it with ethanol solution for 30 minutes, and obtain the melamine-based carbon foam after drying.

[0107] 2. Weigh the ferroce...

Embodiment 3

[0114] A CNTs / Fe 3 o 4 The preparation method of melamine composite carbon foam comprises the following steps:

[0115] 1. Cut the melamine sponge into cuboids whose length, width and thickness are 90mm, 28mm and 20mm, respectively. Soak the cut sample in ethanol solution for 30 minutes and ultrasonically vibrate, wash it repeatedly three times, and wash off the attached impurities before use. Place the pre-washed melamine sponge in a quartz dish, then move it into a tube furnace, and place it in high-purity N 2 Under the protection of , the temperature was raised to 850 °C at a rate of 2 °C / min, and then the carbonization process was carried out in a tube furnace at a constant temperature for 2 h. After the reaction was completed, wait for the tube furnace to cool down to room temperature naturally, take out the carbon foam and ultrasonically wash it with ethanol solution for 30 minutes, and obtain the melamine-based carbon foam after drying.

[0116] 2. Weigh the ferroce...

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Abstract

The invention provides CNTs / Fe3O4 / melamine composite carbon foam as well as a preparation method and application of the CNTs / Fe3O4 / melamine composite carbon foam. The preparation method comprises the following steps: by taking melamine sponge as a raw material, sequentially carrying out a carbonization process and a carbon nanotube in-situ growth process to prepare a flexible carbon matrix material, then carrying out in-situ growth of an iron-based MOFs crystal material on the surface of the flexible carbon matrix material to obtain a CNTs / Fe-MOFs / melamine composite material, and carrying out carbonization treatment to obtain the flexible CNTs / Fe3O4 / melamine composite carbon foam. According to the composite carbon foam prepared by the method, high dispersion of Fe3O4 nanoparticles is realized, so that the electromagnetic shielding performance of the composite foamy carbon can be improved. The material is used in the field of electromagnetic shielding and shows excellent electromagnetic shielding performance.

Description

technical field [0001] The invention relates to the technical field of wave-absorbing materials, in particular to a CNTs / Fe 3 o 4 / Melamine composite carbon foam, its preparation method and its application in electromagnetic shielding. Background technique [0002] With the wide application of modern electronic products and the indiscriminate coverage of wireless transmission signals, electromagnetic waves, as the basic carrier of information transmission, exist in the space of people's lives. At the same time, both the electronic components used in electronic products and various signal towers will inevitably produce electromagnetic pollution, which will shorten the life of electronic equipment and have a certain impact on its sensitive performance. Since electromagnetic shielding is one of the means to effectively control electromagnetic interference and pollution problems, applying certain electromagnetic shielding to various electronic products is the best solution to...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/05C01B32/16C01G49/08C09K3/00H05K9/00
CPCC01B32/05C01B32/16C01G49/08C09K3/00H05K9/0075C01P2002/72C01P2002/80C01P2004/03C01P2004/04
Inventor 金文武尹天长于守立张青青庞伟伟赵小欣张晓柱闫晓宇董锋军梁瑞凯白俊娟冯世昌赵跃成毕玉翠
Owner 河北中煤旭阳能源有限公司
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