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A kind of preparation method of c@ni composite material and electromagnetic shielding film

A composite material, electromagnetic shielding technology, applied in chemical instruments and methods, other chemical processes, etc., can solve problems such as secondary EMI pollution, and achieve the effect of shielding and absorbing electromagnetic waves and strong shielding ability

Active Publication Date: 2021-07-27
徐曦
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As we all know, EMI shielding includes absorption and reflection, however, a large part of EMI shielding comes from reflection, which can lead to secondary EMI pollution

Method used

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  • A kind of preparation method of c@ni composite material and electromagnetic shielding film
  • A kind of preparation method of c@ni composite material and electromagnetic shielding film
  • A kind of preparation method of c@ni composite material and electromagnetic shielding film

Examples

Experimental program
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Effect test

Embodiment 1

[0043] A preparation method of C@Ni composite material, comprising the following steps:

[0044] (1) First mix 0.1-0.3mL of ammonia water and ethanol aqueous solution (28mL), and stir magnetically at room temperature for 1 hour, in which 8mL of ethanol and 20mL of water are in the ethanol aqueous solution, a total of 28mL;

[0045] (2) adding formaldehyde solution and resorcinol to the mixed solution of (1) above, and stirring magnetically at room temperature for 24 hours;

[0046] (3) Transfer the solution obtained in step (2) to a polytetrafluoroethylene reactor, and control the temperature in a drying oven at 100°C for hydrothermal reaction for 24 hours;

[0047] (4) After the hydrothermal reaction finishes, take out the precipitate wherein, clean, dry, obtain monodisperse resorcinol-formaldehyde resin (RF) ball;

[0048] (5) Under an inert atmosphere, calcinate the RF spheres prepared in (4) at 600°C for 6h to obtain precursor C spheres. During calcination, first raise th...

Embodiment 2

[0055] The difference with embodiment 1 is: the NiCl in the step (4) 2 ·6H 2 The amount of O was changed to 1 mmol, and the obtained C@Ni composite material was denoted as A-2 sample; the others were the same as in Example 1.

Embodiment 3

[0057] The difference with embodiment 1 is: the NiCl in the step (4) 2 ·6H 2 The amount of O was changed to 1.5 mmol, and the obtained C@Ni composite material was denoted as A-3 sample; others were the same as in Example 1.

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PUM

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Abstract

The invention belongs to the technology of electromagnetic microwave shielding materials, and discloses a preparation method of a C@Ni composite material and an electromagnetic shielding film. The preparation method of the C@Ni composite material comprises the following steps: mixing ammonia water and ethanol aqueous solution, adding formaldehyde solution and resorcinol, stirring, standing still for hydrothermal reaction, taking out the precipitate, washing and drying the obtained monodisperse room The precursor C spheres were obtained after hydroquinone-formaldehyde resin spheres were calcined, configured into an aqueous solution, added with water-soluble nickel salts and reducing agents, and left to stand for hydrothermal reaction. After the hydrothermal reaction was completed, the precipitates were taken out, washed and dried, and C@Ni composite materials were obtained. The electromagnetic shielding film is obtained by physically combining the obtained C@Ni composite material with a polymer polyvinylidene fluoride. The C@Ni electromagnetic shielding film prepared in the present invention can convert electromagnetic energy flow into thermal energy, potential energy and other forms of energy through mechanisms such as hysteresis loss, dielectric loss, and resistance loss, so as to achieve the effect of shielding and absorbing electromagnetic waves.

Description

technical field [0001] The invention relates to the technical field of electromagnetic microwave shielding materials, in particular to a preparation method of a C@Ni composite material and an electromagnetic shielding film. Background technique [0002] Currently, electronic communication and wearable electronic devices operating in the gigahertz range are rapidly developed. Although human beings have benefited a lot from these advanced technologies, however, the widespread use of mobile communication devices and electronic devices has led to serious increases in electromagnetic interference (EMI) pollution. Not only can this lead to signal distortion and electronic equipment malfunctioning, but it can also have harmful effects on human health. In order to solve these problems, researchers have paid considerable efforts in developing high-performance EMI shielding materials. Electromagnetic shielding materials are characterized by small reflections and transmissions, and h...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L27/16C08K9/10C08K3/08C08K7/18C08J5/18C09K3/00
CPCC08J5/18C08J2327/16C08K3/08C08K7/18C08K9/10C09K3/00
Inventor 徐曦周圆圆
Owner 徐曦