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Electromagnetic wave shielding breathable porous carbon composite material and preparation method and application thereof

A composite material, porous carbon technology, applied in the fields of magnetic field/electric field shielding, electrical components, nanotechnology for materials and surface science, etc. Short cycle, excellent heat dissipation performance, easy to control effect

Active Publication Date: 2021-08-17
HANGZHOU DIANZI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] In order to overcome the problems of high density, high cost, high reflectivity of electromagnetic waves and poor gas circulation of traditional metal shielding materials, the present invention provides a method for preparing electromagnetic wave shielding breathable porous carbon composite materials. The raw materials of this method are easy to obtain and low in cost. Simple operation and easy industrialization

Method used

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  • Electromagnetic wave shielding breathable porous carbon composite material and preparation method and application thereof
  • Electromagnetic wave shielding breathable porous carbon composite material and preparation method and application thereof
  • Electromagnetic wave shielding breathable porous carbon composite material and preparation method and application thereof

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Embodiment 1

[0047] (1) Cut the natural Chinese fir along the direction perpendicular to the growth direction to obtain fir wood blocks. First, pre-carbonize the fir wood blocks at 500°C for 2 hours at a medium temperature, and then carry out high-temperature carbonization at 900°C for 3 hours. The carbonized wood obtained by carbonization step by step The block was sanded to a suitable size, washed with ethanol and deionized water and dried to obtain a carbonized wood block (denoted as CW); its SEM image is shown in figure 2 As shown, it can be seen from the figure that there are a large number of vertical channels in carbonized wood, and the diameter of the channels is between 10 and 10 μm.

[0048] (2) Immerse the carbonized wood block in Ni 2+ In solution, Ni 2+ The solution uses ethylene glycol as a solvent, and includes the following concentrations of components: polyvinylpyrrolidone 0.1 g / mL, Ni(NO 3 ) 2 ·6H 2 O 1.5 mol / L; take it out, and dry it at 100°C for 20 hours to get Ni...

Embodiment 2

[0052] (1) Cut the natural Chinese fir along the direction perpendicular to the growth direction to obtain fir wood blocks. First, pre-carbonize the fir wood blocks at 200°C for 3 hours at a medium temperature, and then carry out high-temperature carbonization at 800°C for 5 hours. The blocks were sanded to a suitable size, washed with ethanol and deionized water and dried to obtain carbonized wood blocks;

[0053] (2) Immerse the carbonized wood block in Ni 2+ In solution, Ni 2+ The solution uses ethylene glycol as the solvent, and includes the following components: polyvinylpyrrolidone 0.05 g / mL, nickel acetate 1.0 mol / L, nickel chloride 1.0 mol / L; take it out, dry it at 60°C for 24 hours, and get the adsorbed Ni 2+ carbonized wood blocks;

[0054] (3) Place the carbonized wood blocks treated in step (2) and dicyandiamide at intervals, the mass ratio of dicyandiamide to carbonized wood blocks is 5:1; feed nitrogen, and dicyandiamide is located upstream of the argon flow, ...

Embodiment 3

[0056] (1) Cut the natural Chinese fir along the direction perpendicular to the growth direction to obtain fir wood blocks. First, pre-carbonize the fir wood blocks at 400°C for 1 hour at a medium temperature, and then carry out high-temperature carbonization at 1000°C for 2 hours. The blocks were sanded to a suitable size, washed with ethanol and deionized water and dried to obtain carbonized wood blocks;

[0057] (2) Immerse the carbonized wood block in Ni 2+ In solution, Ni 2+ The solution uses ethylene glycol as the solvent, and includes the following components: polyvinylpyrrolidone 0.15 g / mL, nickel sulfate 0.1 mol / L; take it out, and dry it at 120°C for 12 hours to obtain the adsorbed Ni 2+ carbonized wood blocks;

[0058] (3) Place the carbonized wood blocks treated in step (2) and dicyandiamide at intervals, and the mass ratio of dicyandiamide to carbonized wood blocks is 20:1; feed nitrogen, and dicyandiamide is located at the upstream of the argon flow, Carry out...

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Abstract

The invention relates to the technical field of electromagnetic shielding, in particular to an electromagnetic wave shielding breathable porous carbon composite material and a preparation method and application thereof. The preparation method comprises the following steps: 1, enabling a wood block to be subjected to medium-temperature pre-carbonization and then subjected to high-temperature carbonization, and obtaining a carbonized wood block; (2) dipping the carbonized wood block in a Ni2+ solution, taking out the carbonized wood block and drying the carbonized wood block; (3) placing the carbonized wood block and dicyandiamide at an interval, introducing nitrogen, performing heating in different temperature zones, growing nitrogen-doped carbon nanotubes on the carbonized wood blocks adsorbed with Ni2+ in situ, and obtaining the nickel@nitrogen-doped carbon nanotube / carbonized wood composite material. The Ni@NCNT / CW composite material prepared by adopting the method is light magnetic porous carbon, nitrogen-doped carbon nanotubes grow in situ in the Ni-coated NCNT / CW composite material, the Ni-coated NCNT / CW composite material shows electromagnetic wave shielding performance with main absorption, and the porous structure endows the material with good air permeability, good gas circulation and excellent heat dissipation performance.

Description

technical field [0001] The invention relates to the technical field of electromagnetic shielding, in particular to an electromagnetic wave shielding breathable porous carbon composite material and a preparation method and application thereof. Background technique [0002] With the rapid development of science and technology, the wide application of electronic equipment has caused serious electromagnetic pollution. Therefore, the development of lightweight and efficient electromagnetic shielding interference materials is crucial to suppress electromagnetic pollution. Traditional metal shielding materials may cause application limitations due to their ultra-high density, high-frequency failure, easy corrosion, airtightness, expensive processing costs, and reflection-based electromagnetic shielding mechanism. [0003] Aiming at the limited application of metal shielding materials, the following methods are currently used to solve the problem: (1) Select conductive rubber with ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05K9/00B82Y30/00
CPCH05K9/0081B82Y30/00
Inventor 张雪峰成明亮李红霞孙玉萍刘先国
Owner HANGZHOU DIANZI UNIV
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