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Preparation method of sandwich structure FA/MXene/CNF composite material

A sandwich structure and composite material technology, applied in the direction of magnetic/electric field shielding, electrical components, etc., can solve the problems of large reflection and low electromagnetic shielding efficiency, and achieve the effect of maintaining performance, improving electromagnetic shielding performance, and maintaining stability

Pending Publication Date: 2021-11-12
XIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a method for preparing a sandwich structure FA / MXene / CNF composite material, which solves the problems of low electromagnetic shielding efficiency and large reflection of existing composite materials

Method used

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  • Preparation method of sandwich structure FA/MXene/CNF composite material
  • Preparation method of sandwich structure FA/MXene/CNF composite material
  • Preparation method of sandwich structure FA/MXene/CNF composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0064] A kind of preparation method of sandwich structure FA / MXene / CNF composite material of the present invention, specifically implement according to the following steps:

[0065] Step 1, prepare an MXene solution with a few-layer structure by etching the MAX phase precursor with LiF / HCl, the specific steps are as follows:

[0066] Step 1.1, fully mix LiF and HCl, then slowly add MAX phase precursor powder to obtain a mixture;

[0067] The mass ratio of LiF, HCl and MAX phase precursor powder is 1:20:1;

[0068] Step 1.2, the mixture was stirred at 35°C for 24h to obtain MXene(Ti 3 C 2 T x ) suspension, and then repeatedly centrifuged and washed with deionized water until the pH of the solution was 7 to obtain Ti 3 C 2 T x Precipitate;

[0069] When washing by centrifugation, the centrifugation rate is 3500r / min;

[0070] Step 1.3, the Ti 3 C 2 T x Disperse the precipitate in deionized water, ultrasonically disperse for 10-20min to promote the layering of multilay...

Embodiment 2

[0093] A kind of preparation method of sandwich structure FA / MXene / CNF composite material of the present invention, specifically implement according to the following steps:

[0094] Step 1, prepare an MXene solution with a few-layer structure by etching the MAX phase precursor with LiF / HCl, the specific steps are as follows:

[0095] Step 1.1, fully mix LiF and HCl, then slowly add MAX phase precursor powder to obtain a mixture;

[0096] The mass ratio of LiF, HCl and MAX phase precursor powder is 1:20:1;

[0097] Step 1.2, the mixture was stirred at 30°C for 25h to obtain MXene(Ti 3 C 2 T x ) suspension, and then repeatedly centrifuged and washed with deionized water until the pH of the solution was 7 to obtain Ti 3 C 2 T x Precipitate;

[0098] When washing by centrifugation, the centrifugation rate is 3600r / min;

[0099] Step 1.3, the Ti 3 C 2 T x Disperse the precipitate in deionized water, ultrasonically disperse for 10-20min to promote the stratification of mu...

Embodiment 3

[0122] A kind of preparation method of sandwich structure FA / MXene / CNF composite material of the present invention, specifically implement according to the following steps:

[0123] Step 1, prepare an MXene solution with a few-layer structure by etching the MAX phase precursor with LiF / HCl, the specific steps are as follows:

[0124] Step 1.1, fully mix LiF and HCl, then slowly add MAX phase precursor powder to obtain a mixture;

[0125] The mass ratio of LiF, HCl and MAX phase precursor powder is 1:20:1;

[0126] Step 1.2, the mixture was stirred at 40°C for 23h to obtain MXene(Ti 3 C 2 T x ) suspension, and then repeatedly centrifuged and washed with deionized water until the pH of the solution was 7 to obtain Ti 3 C 2 T x Precipitate;

[0127] During centrifugal washing, the centrifugal speed is 3400r / min;

[0128] Step 1.3, the Ti 3 C 2 T x The precipitate was dispersed in deionized water and ultrasonically dispersed for 10 minutes to promote the stratification ...

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Abstract

The invention discloses a preparation method of a sandwich structure FA / MXene / CNF composite material. The method specifically comprises the following steps: firstly, etching an MAX phase precursor through LiF / HCl to prepare an MXene solution; carbonizing and activating egg white to obtain biomass carbon, and loading Fe3O4 on the surface by a hydrothermal method to obtain FA; mixing FA and CNF solutions, and carrying out suction filtration on a mixed fiber membrane to obtain a bottom layer FA / CNF membrane; carrying out suction filtration on an MXene solution on the FA / CNF bottom layer to obtain a double-layer membrane; adding a mixed solution of FA and CNF solutions to the double-layer membrane, and carrying out suction filtration to obtain an FA / CNF, MXene and FA / CNF three-layer membrane; and finally, stripping from the mixed fiber membrane, and performing hot pressing. Due to the unique design of the composite material, electromagnetic waves can easily enter the composite material, the electromagnetic waves are weakened in the sandwich structure through the absorption-reflection-reabsorption process, and therefore the excellent electromagnetic shielding performance is obtained.

Description

Technical field [0001] The invention belongs to the technical field of composite material preparation, and specifically relates to a method for preparing a sandwich structure FA / MXene / CNF composite material. Background technique [0002] With the widespread use of electronic devices, especially the arrival of the 5G era, while they bring convenience to people, the accompanying electromagnetic pollution has become an increasingly serious problem. Electromagnetic pollution not only affects the normal operation of nearby electronic equipment, but also poses a serious threat to human health. Therefore, the development of high-performance electromagnetic shielding materials is of great significance to solve this problem. On the premise of ensuring the excellent electromagnetic shielding performance of electromagnetic shielding materials, the absorption performance of the material should be improved as much as possible to reduce secondary pollution of electromagnetic waves. Con...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05K9/00
CPCH05K9/0088
Inventor 任鹏刚郭铮铮宗泽任芳
Owner XIAN UNIV OF TECH
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