Preparation method and application of three-dimensional graphene-based composite material

A composite material, graphene-based technology, applied in the fields of magnetic field/electric field shielding, electrical components, etc., can solve the problems of susceptibility to corrosion and oxidation, high density, etc., to achieve the effect of enhancing electromagnetic shielding efficiency and broad application prospects

Active Publication Date: 2022-05-31
SUZHOU INST OF NANO TECH & NANO BIONICS CHINESE ACEDEMY OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Traditional microwave shielding materials mainly use the excellent electronic conductivity of metals to achieve high electromagnetic shielding effectiveness, so they have disadvantages such as high density, easy corrosion and oxidation, etc.

Method used

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  • Preparation method and application of three-dimensional graphene-based composite material
  • Preparation method and application of three-dimensional graphene-based composite material
  • Preparation method and application of three-dimensional graphene-based composite material

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preparation example Construction

[0033] As an aspect of the technical solution of the present invention, it relates to a preparation method of a three-dimensional graphene-based composite material, comprising:

[0034] Immerse the foamed metal in a 5-25mg / ml graphene oxide solution for 20-40kHz ultrasonic treatment for 0.5-1.5h, and then dry to obtain a graphene oxide / foamed metal composite material;

[0035] The graphene oxide / foamed metal composite material is etched with dilute mixed acid, and then dried to obtain three-dimensional graphene oxide;

[0036] annealing the three-dimensional graphene oxide in an inert gas / hydrogen mixed atmosphere to obtain three-dimensional high-quality thin-layer graphene;

[0037] Mixing the three-dimensional high-quality thin-layer graphene with the chiral microbial extract solution to obtain a three-dimensional graphene composite material loaded with the chiral microbial extract;

[0038] adding the three-dimensional graphene composite material loaded by the microorganis...

Embodiment 1

[0104] (1) get 1.5 mass parts of graphite flakes or graphite powder and place it in the ferric salt aqueous solution with a concentration of 0.8mol / L for etching 30h, then place it in the concentrated sulfuric acid of concentration 5mol / l, volume ratio 9:1 and In the beaker of the mixed acid of concentrated phosphoric acid, react at 60°C for 3h, place the beaker in a magnetic stirring pot that has been preset at 50°C, and slowly add 9 mass fraction of potassium permanganate powder to the beaker (adding time). Controlled at 45-90min), after the addition, the reaction system was continued to be heated at 50°C for 6h. After 6h, continue to slowly add a certain proportion of H diluted to the above system. 2 O 2 The solution is not added until the color of the solution changes from black to purple and then to golden yellow. The above reaction system was continued to be heated at 50° C. for 3 hours, then cooled down, washed by centrifugation, and freeze-dried to obtain graphene ox...

Embodiment 2

[0113] (1) Get 1.5 mass parts of graphite flakes or graphite powder and place it in a ferric salt aqueous solution with a concentration of 1.5 mol / L for etching for 20h, then place it in the concentrated sulfuric acid of 8 mol / 1, volume ratio 9:1 and In the beaker of the mixed acid of concentrated phosphoric acid, react at 90°C for 2h, place the beaker in a magnetic stirring pot that has been preset at 50°C, and slowly add 9 mass fractions of potassium permanganate powder to the beaker (adding time). Controlled at 45-90min), after the addition, the reaction system was continued to be heated at 50°C for 6h. After 6h, continue to slowly add a certain proportion of H diluted to the above system. 2 O 2 The solution is not added until the color of the solution changes from black to purple and then to golden yellow. The above reaction system was continued to be heated at 50° C. for 3 hours, then cooled down, washed by centrifugation, and freeze-dried to obtain graphene oxide.

[...

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Abstract

The invention discloses a preparation method and application of a three-dimensional graphene-based composite material. The preparation method is as follows: immerse the foamed metal in a graphene oxide solution for ultrasonic treatment to obtain a graphene oxide / foamed metal composite material; then use dilute mixed acid etching to obtain a three-dimensional graphene oxide, and then anneal to obtain a three-dimensional High-quality thin-layer graphene; it is mixed with microbial chiral extract and added to epoxy resin solution to obtain thin-layer graphene slurry; using synthetic fiber cloth as basic template, coated with thin-layer graphene on at least one side The slurry is used to form a corresponding synthetic fiber cloth / graphene electromagnetic shielding composite material; the above-mentioned composite material is infiltrated with a liquid phase system of a high molecular polymer, and finally cured and packaged. The three-dimensional graphene-based composite material prepared by the invention has the characteristics of ultra-light weight, oxidation resistance, corrosion resistance, flexibility, high-efficiency electromagnetic shielding, etc., and has broad application prospects in the field of electromagnetic shielding materials.

Description

technical field [0001] The invention relates to a preparation method of an electromagnetic shielding material, in particular to a graphene-based composite material having the synergistic effect of a microbial chiral extract and a three-dimensional graphene material and combined with a flexible polymer, and a preparation method thereof, The invention and its application in the field of electromagnetic shielding materials belong to the production technology and application field of electromagnetic shielding materials. Background technique [0002] With the development of electronic information technology, technologies such as electromagnetic wave communication, detection, and interference are widely used. The resulting electromagnetic radiation not only harms people's health and safety, but also seriously affects the normal function and life of electronic equipment. In recent years, the rapid development of electronic instruments has put forward higher requirements for high-e...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H05K9/00
CPCH05K9/0081
Inventor 刘立伟宁云飞张迎飞邢敕天李奇赵礼仪郑梦鸽
Owner SUZHOU INST OF NANO TECH & NANO BIONICS CHINESE ACEDEMY OF SCI
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