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Porous carbon-based electromagnetic absorbing agent and preparation method thereof

An electromagnetic wave absorbing and porous carbon technology is applied in the field of wave absorbing materials, which can solve the problems of long time consumption, low yield and high cost, and achieve the effects of excellent wave absorption performance, high absorption strength and wide absorption frequency band.

Active Publication Date: 2018-09-11
江苏万华拓谷新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are still many problems in the existing research: 1. There is still a lot of room for improvement in the reflection loss of the electromagnetic absorber, mainly because it needs to meet the low thickness (≤2mm) to achieve a wide effective absorption band (≥4GHz); 2. The preparation process of MOFs is complicated, time-consuming, and the yield is low, and most of them use highly toxic organic solvents; 3. The filling degree of the electromagnetic absorber is still large (≥ 40wt%) and the design of the microstructure and the electromagnetic properties of the final sample The relationship between them is still to be determined; 4. The cost is high, the yield is low, and it is not suitable for large-scale industrial production

Method used

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  • Porous carbon-based electromagnetic absorbing agent and preparation method thereof
  • Porous carbon-based electromagnetic absorbing agent and preparation method thereof
  • Porous carbon-based electromagnetic absorbing agent and preparation method thereof

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Embodiment 1

[0035] The preparation method of the porous carbon-based electromagnetic wave absorbing agent of the present invention comprises the following steps:

[0036] Step 1: Add 0.7244g ferric chloride, 0.384g nickel nitrate, 0.6644g terephthalic acid to 40mL N,N-dimethylformamide, after completely dissolving, add 8mL0.4mol / L sodium hydroxide solution, stir for 15min After that, solvothermal reaction was performed at 100°C for 15 hours; after the reaction, the product was washed by centrifugation and dried to obtain the precursor product Fe 2 Ni MIL-88;

[0037] Step 2: Put the precursor powder obtained in step 1 in N 2 In the atmosphere, the temperature was raised to 700°C at a rate of 5°C / min and kept for 4 hours, and Fe was obtained after natural cooling. 3 Ni / C composite material, marked as S-FNC;

[0038] Step 3: Add 1gFe 3 The Ni / C composite material S-FNC was corroded in 6mol / L hydrochloric acid for 24 hours, and after centrifugal washing and drying, a porous carbon-based ...

Embodiment 2

[0040] The preparation method of the porous carbon-based electromagnetic wave absorbing agent of the present invention comprises the following steps:

[0041] Step 1: Add 0.7244g ferric chloride, 0.384g nickel nitrate, 0.6644g terephthalic acid to 40mL N,N-dimethylformamide, after completely dissolving, add 8mL0.4mol / L sodium hydroxide solution, stir for 15min Afterwards, solvothermal reaction at 120°C for 24 hours; after the reaction, the product was washed by centrifugation and dried to obtain the precursor product Fe 2 Ni MIL-88;

[0042] Step 2: Put the precursor powder obtained in step 1 in N 2 In the atmosphere, the temperature was raised to 700°C at a rate of 5°C / min and kept for 4 hours, and Fe was obtained after natural cooling. 3 Ni / C composite material, marked as S-FNC(I);

[0043] Step 3: Add 1gFe 3 The Ni / C composite material S-FNC was corroded in 10mol / L hydrochloric acid for 24 hours, and after centrifugal washing and drying, a porous carbon-based material w...

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Abstract

The present invention discloses a porous carbon-based electromagnetic absorbing agent. The porous carbon-based electromagnetic absorbing agent comprises a plurality of dispersive two-dimensional sheetstructures, each dispersive two-dimensional sheet structure is formed by formless porous carbon frame and a graphitization carton layer inlaid into the carbon framework, and the graphitization cartonlayer is a hollow ball housing shape. The present invention further discloses a preparation method of a porous carbon-based electromagnetic absorbing agent. The porous carbon-based electromagnetic absorbing agent is high in absorption intensity in an ultra low filling degree and low thickness compared with traditional absorbing materials and metal organic framework derivative electromagnetic absorbing materials, can effectively absorb bandwidth, and has an excellent absorbing property; and moreover, the preparation method is simple in technology and low in cost, does not need complex synthesis devices, does not need usage of virulent chemical reagents and is suitable for industrial large-scale production.

Description

technical field [0001] The invention relates to a porous carbon-based electromagnetic wave absorber, and also relates to a preparation method of the porous carbon-based electromagnetic wave absorber, which belongs to the technical field of wave-absorbing materials. Background technique [0002] The rapid development of electromagnetic technology not only greatly promotes the development of social economy and the improvement of living standards, but also inevitably brings serious electromagnetic pollution problems. Specifically, electromagnetic pollution will threaten the normal physiological activities of organisms and interfere with the normal operation of electrical and electronic equipment. In addition, in the military field, the electromagnetic stealth capability of weapons and equipment has gradually become a key technology to ensure survival and strike the enemy. Therefore, the research and development of absorbing materials is in full swing, and its development trend...

Claims

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Application Information

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IPC IPC(8): H05K9/00C09K3/00C01B32/05
CPCC01B32/05C09K3/00H05K9/00
Inventor 姬广斌刘伟
Owner 江苏万华拓谷新材料科技有限公司
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