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Co/C composite electromagnetic absorbing agent and preparation method thereof

A technology of composite electromagnetic and wave absorbing agent, which is applied in the field of wave absorbing materials, can solve the problems of unsuitability for large-scale industrial production, complex preparation process, and low yield, and achieve enhanced interface polarization effect, simple process, wide and effective absorption The effect of frequency band

Inactive Publication Date: 2018-08-07
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

(Yin, Y.; Liu, X.; Wei, X.; Li, Y.; Nie, X.; Yu, R.; Shui, J. Magnetically Aligned Co–C / MWCNTs Composite Derived from MWCNT-Interconnected Zeolitic Imidazolate Frameworks for a Lightweight and HighlyEfficient Electromagnetic Wave Absorber.ACS Appl.Mater.Interfaces 2017,9,30850-30861.) However, there are still many deficiencies in the prior art: 1. The preparation process is complicated, and CNTs need to undergo complex functions during the experiment. process
2. The cost is high, the yield is low, and it is not suitable for large-scale industrial production

Method used

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  • Co/C composite electromagnetic absorbing agent and preparation method thereof
  • Co/C composite electromagnetic absorbing agent and preparation method thereof
  • Co/C composite electromagnetic absorbing agent and preparation method thereof

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Embodiment 1

[0026] The Co / C composite electromagnetic absorber of the present invention is composed of carbon nanotubes and cobalt nanoparticles attached to the inner surface or outer surface of the carbon nanotubes; the carbon nanotubes form a three-dimensional connected network structure; the Co / C composite The electromagnetic absorber is prepared by the following method:

[0027] Step 1, preparation of Co by emulsion polymerization 2+ / MF precursor: Add 0.075mol melamine and 0.196mol formaldehyde to 40mL deionized water, place the mixture in a constant temperature oil bath at 80°C and stir for 30min to obtain a transparent methylolmelamine solution, transparent methylolmelamine The solution is solution A; at the same time, 3 mmol of cobalt nitrate and 7.5 mL of OP-10 (OP-10 is an aqueous solution with a mass fraction of 10 wt%) were dissolved in another 40 mL of deionized water, and stirred at 50° C. for 1 h to obtain solution B; The solution was cooled to 50°C, then the A solution wa...

Embodiment 2

[0030] Step 1, preparation of MF precursor by emulsion polymerization: add 0.075mol melamine and 0.196mol formaldehyde to 40mL deionized water, place the mixed material in a constant temperature oil bath at 80°C and stir for 30min to obtain a transparent methylolmelamine solution, The transparent methylolmelamine solution is solution A; at the same time, 7.5 mL of OP-10 (OP-10 is an aqueous solution with a mass fraction of 10 wt%) was dissolved in another 40 mL of deionized water, and stirred at 50° C. for 1 hour to obtain solution B; Cool the A solution to 50°C, then slowly drop the A solution into the B solution, adjust the pH of the mixed solution to 4.5 with 2mol / L dilute hydrochloric acid, continue to stir in a 50°C constant temperature oil bath for 2 hours, and vacuum pump after the reaction. Filter to obtain the melamine formaldehyde resin (MF) precursor;

[0031] Step 2, place the MF precursor prepared in step 1 in Ar 2 Calcined in the atmosphere, raised to 800°C at a...

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Abstract

The invention discloses a Co / C composite electromagnetic absorbing agent. The composite electromagnetic absorbing agent is composed of carbon nanotubes and cobalt nanoparticles attached to an inner surface or an outer surface of the carbon nanotubes, wherein the carbon nanotubes form the three-dimensional connected network structure. The invention further discloses a preparation method of the Co / Ccomposite electromagnetic absorbing agent. The Co / C composite electromagnetic absorbing agent is advantaged in that the Co / C composite electromagnetic absorbing agent has the three-dimensional connected network structure, the effective way for electronic transmission and hopping is provided by the three-dimensional connected network structure, and material conductivity as well as the material dielectric loss are enhanced; metal cobalt generated through high temperature calcining is introduced to the magnetic loss mechanism, in addition, coexistence of Co and C in the composite material is also beneficial to enhance the interfacial polarization effect, attenuation of electromagnetic waves is accelerated through multi-method synergy, so the Co / C composite electromagnetic absorbing materialhas strong reflection loss and the wider effective absorption band at low thickness.

Description

technical field [0001] The invention relates to a Co / C composite electromagnetic wave absorber, and also relates to a preparation method of the Co / C composite electromagnetic wave absorber, which belongs to the technical field of wave absorbing materials. Background technique [0002] With the development of science and technology and the wide application of electronic equipment, electromagnetic pollution, as a new type of pollution source, has brought serious interference problems to the human body and the normal work of electronic products. The preparation of lightweight and efficient absorbing materials has become an effective way to protect and weaken electromagnetic waves. In the military field, with the development of electromagnetic wave stealth technology, electromagnetic wave absorbing materials can avoid and reduce the detection, positioning and tracking of radar and infrared waves, which has become a research hotspot in the field of military stealth in various cou...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05K9/00C09K3/00
CPCH05K9/00C09K3/00
Inventor 姬广斌赵唤琴成岩
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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