Preparation method of C@Ni composite material and electromagnetic shielding film

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

Active Publication Date: 2019-11-26
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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  • Preparation method of C@Ni composite material and electromagnetic shielding film
  • Preparation method of C@Ni composite material and electromagnetic shielding film
  • Preparation method of C@Ni composite material and electromagnetic shielding film

Examples

Experimental program
Comparison scheme
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

Belonging to the technical field of electromagnetic microwave shielding materials, the invention discloses a preparation method of a C@Ni composite material and an electromagnetic shielding film. Thepreparation method of the C@Ni composite material includes the steps of: mixing ammonia water with an ethanol aqueous solution, adding a formaldehyde solution and resorcinol, performing stirring, andcarrying out standing hydrothermal reaction, then taking out the precipitate, conducting cleaning and drying to obtain a monodisperse resorcinol-formaldehyde resin ball, and performing calcination toobtain a precursor ball C, preparing the precursor ball C into an aqueous solution, adding a water-soluble nickel salt and a reducing agent, carrying out standing hydrothermal reaction, then taking out the precipitate, and performing cleaning and drying to obtain the C@Ni composite material. The electromagnetic shielding film is obtained by physical combination of the obtained C@Ni composite material with a macromoleclar polymer polyvinylidene fluoride. The C@Ni electromagnetic shielding film obtained by the invention can realize conversion of electromagnetic energy flow to heat energy, potential energy and other forms of energy by magnetic hysteresis loss, dielectric loss, resistance loss and other mechanisms, and reach the effect of shielding and absorbing electromagnetic wave.

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 Applications(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
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