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Preparation method for novel foam carbon electromagnetic shielding composite material

A composite material, electromagnetic shielding technology, applied in the fields of magnetic field/electric field shielding, chemical instruments and methods, electrical components, etc., can solve the problems of general dispersion effect, can not ensure uniform dispersion of nanoparticles, and achieve enhanced electromagnetic shielding performance, electromagnetic shielding The effect of excellent performance and simple preparation process

Active Publication Date: 2019-12-13
XIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the commonly used methods to solve the problem of agglomeration of nanoparticles or carbon nanotubes in the foamed carbon matrix mainly include ultrasonic dispersion, ball milling, calendering, stirring and extrusion, and adding surfactants, etc., but the dispersion effect of these methods In general, uniform dispersion of nanoparticles cannot be guaranteed

Method used

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  • Preparation method for novel foam carbon electromagnetic shielding composite material
  • Preparation method for novel foam carbon electromagnetic shielding composite material
  • Preparation method for novel foam carbon electromagnetic shielding composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Step 1, pretreatment of melamine foam:

[0035] The melamine foam was ultrasonically cleaned with deionized water and absolute ethanol, respectively, for 30 minutes each, and then dried in an oven at a temperature of 90°C for 12 hours;

[0036] Step 2, place the pretreated melamine foam in step 1 in a tube furnace, 2 Multi-stage carbonization treatment is carried out under the protection of the atmosphere. The first stage is heated from room temperature to 200°C and kept for 1-2 hours; the second stage is heated to 400°C and kept for 1-2 hours; Control the cooling rate, cool the sample to room temperature, and the heating rate and cooling rate are both 5°C / min to prepare foamed carbon;

[0037] Step 3, configure Fe 3 o 4 Reaction solution of nanoparticles: Dissolve 2.3g of FeCl in 20ml of deionized water 3 ·6H 2 O and 1.2 g FeSO 4 ·7H 2 O, and add 0.3g surfactant PVP (polyvinylpyrrolidone), then magnetic stirring for 1 ~ 2h to obtain a uniform Fe 3 o 4 Reaction...

Embodiment 2

[0040] Step 1, pretreatment of melamine foam:

[0041] The melamine foam was ultrasonically cleaned with deionized water and absolute ethanol, respectively, for 30 minutes each, and then dried in an oven at a temperature of 90°C for 12 hours;

[0042] Step 2, place the pretreated melamine foam in step 1 in a tube furnace, 2 Multi-stage carbonization treatment is carried out under the protection of the atmosphere. The first stage is heated from room temperature to 200°C and kept for 1-2 hours; the second stage is heated to 400°C and kept for 1-2 hours; finally the temperature is raised to 850°C and kept for 1-2 hours. Finally, the cooling rate was controlled, and the sample was cooled to room temperature, and the heating rate and cooling rate were both 3°C / min to prepare foamed carbon;

[0043] Step 3, configure Fe 3 o 4 Reaction solution of nanoparticles: Dissolve 4.6g of FeCl in 40ml of deionized water 3 ·6H 2 O and 2.4 g FeSO 4 ·7H 2 O, and add 0.73g surfactant PVP (p...

Embodiment 3

[0047] Step 1, pretreatment of melamine foam:

[0048] The melamine foam was ultrasonically cleaned with deionized water and absolute ethanol, respectively, for 30 minutes each, and then dried in an oven at a temperature of 90°C for 12 hours;

[0049] Step 2, place the pretreated melamine foam in step 1 in a tube furnace, 2 Under the protection of the atmosphere, multi-stage carbonization treatment is carried out. The first stage is heated from room temperature to 200°C and kept for 1-2 hours; the second stage is heated to 400°C and kept for 1-2 hours; Control the cooling rate, cool the sample to room temperature, and the heating rate and cooling rate are both 4°C / min to prepare foamed carbon;

[0050] Step 3, configure Fe 3 o 4 Reaction solution of nanoparticles: Dissolve 6.9g of FeCl in 60ml deionized water 3 ·6H 2 O and 3.6 g FeSO 4 ·7H 2 O, and add 1.05g surfactant PVP (polyvinylpyrrolidone), then magnetically stir for 1-2h to get a uniform Fe 3 o 4 Reaction solut...

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Abstract

The invention discloses a preparation method for a novel foam carbon electromagnetic shielding composite material. The preparation method comprises the following steps of: pretreating melamine foam, carbonizing the melamine foam to prepare foam carbon, preparing a reaction solution of Fe3O4 nano particles, preparing a Fe3O4 nano particle / foam carbon reaction mixed solution, and conducing drying toobtain the prepared Fe3O4 nano particle / foam carbon composite material. According to the preparation method for the novel foam carbon electromagnetic shielding composite material, Fe3O4 nanoparticlesand flexible foam carbon are compounded to obtain the flexible light electromagnetic shielding composite material with excellent electromagnetic shielding performance, so that the Fe3O4 nanoparticlescan be uniformly dispersed.

Description

technical field [0001] The invention belongs to a method for preparing a foamed carbon electromagnetic shielding composite material, and relates to a preparation method of a novel foamed carbon electromagnetic shielding composite material. Background technique [0002] The progress of electronic technology and the rapid development of information industry inevitably bring about the problem of electromagnetic radiation. Electromagnetic interference and radio frequency interference caused by electromagnetic wave radiation will not only cause problems such as electronic equipment failure, communication interruption, and electromagnetic information leakage, but also seriously endanger the living environment and health of human beings. Therefore, the development of new and efficient electromagnetic shielding materials has gradually attracted widespread attention. At present, the electromagnetic shielding materials that occupy the main market share are mainly metals and their all...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05K9/00C09K3/00
CPCC09K3/00H05K9/0081
Inventor 刘和光井蕊璇徐慧游才印
Owner XIAN UNIV OF TECH
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