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Absorbing agents, preparation method, application and absorbing materials of magnetic fluorocarbon materials

A technology of fluorinated carbon and wave absorbing agent, which is applied in the field of application and wave absorbing materials, preparation methods, and magnetic fluorinated carbon material wave absorbing agent, which can solve the problem of limiting the application of fluorinated carbon nanotubes, unfavorable large-scale industrial production, carbon Nanotube structure damage and other problems, to achieve excellent impedance matching performance, high absorbing strength, low cost effect

Inactive Publication Date: 2018-10-19
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

On the one hand, high fluorination temperature is not conducive to large-scale industrial production, and on the other hand, it also causes great damage to the structure of carbon nanotubes.
In addition, fluorinated carbon nanotubes are a non-magnetic material, and as a wave absorbing material, dielectric loss is still the main factor, so the wave absorption frequency band of fluorinated carbon nanotube absorbers is often narrow (less than 2GHz)
These disadvantages greatly limit the application of fluorinated carbon nanotubes

Method used

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  • Absorbing agents, preparation method, application and absorbing materials of magnetic fluorocarbon materials
  • Absorbing agents, preparation method, application and absorbing materials of magnetic fluorocarbon materials
  • Absorbing agents, preparation method, application and absorbing materials of magnetic fluorocarbon materials

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preparation example Construction

[0050] In the first aspect, in at least one embodiment, a method for preparing a magnetic fluorinated carbon material wave absorbing agent is provided, comprising the following steps:

[0051] Firstly, Fe3O4 nanoparticles were supported on carbon materials to prepare Fe 3 o 4 @Carbon material composite material, and then treat the Fe at a temperature of 0-30°C 3 o 4 @Carbon material composite material is fluorinated to obtain a magnetic fluorinated carbon material absorber.

[0052] In the preparation method of the present invention, first ferric oxide nanoparticles are loaded on carbon materials to prepare Fe 3 o 4 @Carbon material composite material, then Fe 3 o 4 @Carbon material composite material is placed in a fluorination reactor at 0-30°C (room temperature) for direct fluorination treatment. On the one hand, the introduction of ferroferric oxide can increase the magnetic properties of carbon nanotubes; on the other hand, ferroferric oxide can increase the fluori...

Embodiment 1

[0087] A preparation method of a magnetic fluorinated carbon material wave absorbing agent, comprising the following steps:

[0088] (a) 400mgFeCl 3 ·6H 2 O was dissolved in 40ml of ethylene glycol, 100mg of carbon nanotubes were added and fully dispersed in an ultrasonic instrument; at the same time, 700mg of sodium acetate was dissolved in 40ml of ethylene glycol to prepare a sodium acetate / ethylene glycol solution;

[0089] (b) Under the protection of nitrogen, the above sodium acetate / ethylene glycol solution was added dropwise to the carbon nanotube-FeCl 3 / Ethylene glycol dispersion, keep stirring for 30 minutes until the liquid is fully mixed;

[0090] (c) Move the above mixed solution into a polytetrafluoroethylene-lined hydrothermal reaction kettle, and keep it at 180°C for 5h;

[0091] (d) Carry out solid-liquid separation to the above-mentioned mixed solution, obtain Fe after washing, drying and grinding 3 o 4 @CNTs nanocomposites;

[0092] (e) 50mg of the abo...

Embodiment 2

[0095] A preparation method of a magnetic fluorinated carbon material wave absorbing agent, comprising the following steps:

[0096] (a) 450mgFeCl 3 ·6H 2 O was dissolved in 40ml of ethylene glycol, 100mg of carbon nanotubes were added and fully dispersed in an ultrasonic instrument; at the same time, 800mg of sodium acetate was dissolved in 40ml of ethylene glycol to prepare a sodium acetate / ethylene glycol solution;

[0097] (b) Under the protection of nitrogen, the above sodium acetate / ethylene glycol solution was added dropwise to the carbon nanotube-FeCl 3 / Ethylene glycol dispersion, keep stirring for 50 minutes until the liquid is fully mixed;

[0098] (c) Transfer the above mixed solution into a polytetrafluoroethylene-lined hydrothermal reaction kettle, and keep it at 190°C for 7h;

[0099] (d) Carry out solid-liquid separation to the above-mentioned mixed solution, obtain Fe after washing, drying and grinding 3 o 4 @CNTs nanocomposites;

[0100] (e) 50mg of the...

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Abstract

The invention belongs to the technical field of absorbing materials and relates to absorbing agents, a preparation method, application and the absorbing materials of magnetic fluorocarbon materials. The preparation method includes: firstly, magnetic nanoparticles are loaded on carbon materials to prepare ferriferrous oxide @ carbon material composites, and then the ferriferrous oxide @ carbon material composites are fluoridized at 0-30 DEG C. The absorbing agents, the preparation method, the application and the absorbing materials of the magnetic fluorocarbon materials have the advantages that: on the one hand, the introduction of the ferriferrous oxide can increase the magnetism of carbon nanotubes; on the other hand, the ferriferrous oxide can improve the fluorination reaction activity of the carbon nanotubes; therefore, fluorinated carbon nanotubes with high fluorination degree can be prepared at lower temperature, thereby being beneficial to reduce the dielectric constant of the absorbing agents. Therefore, the magnetic fluorinated carbon nanotubes have high permeability and low dielectric constant to show good impedance matching, thereby having strong absorbing intensity and wide absorbing frequency band and meeting the requirements of 'light, thin, strong and wide' of novel absorbing materials.

Description

technical field [0001] The invention belongs to the technical field of wave-absorbing materials, and in particular relates to a magnetic fluoride carbon material wave-absorbing agent, a preparation method, an application and a wave-absorbing material. Background technique [0002] With the continuous development of electronic science and technology and the wide application of electronic products, on the one hand, it has brought great convenience to people's daily life, and on the other hand, the electromagnetic waves generated by electronic products during use have also caused great troubles to people. . In daily life, electromagnetic waves disrupt normal communication, and even cause great harm to people's lives and health; in military affairs, the rapid development of radar technology poses a great threat to the safety of aircraft. Traditional ferromagnetic wave absorbers can no longer meet people's needs due to their shortcomings such as high density and weak absorption....

Claims

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Application Information

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IPC IPC(8): H01F1/01H01F41/00H05K9/00C01G49/08C01B32/158
CPCH01F1/01C01B32/158C01G49/08C01P2002/85C01P2006/42H01F41/00H05K9/0081
Inventor 刘向阳刘洋王旭罗龙波张奕淳朱波刘昌莉
Owner SICHUAN UNIV
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