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Electromagnetic shielding material and nano-grade composite material thereof, and preparation methods thereof

A technology of electromagnetic shielding materials and carbon nanotubes, applied in chemical instruments and methods, and other chemical processes, to achieve the effects of low toxicity, strong applicability, and simple operation

Active Publication Date: 2016-02-10
BEIJING RADIATION APPL RES CENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, at present, the preparation of metal nanoparticles / graphene / carbon nanotube nanocomposites with three-dimensional network structure mostly adopts complex vapor deposition method or water / solvothermal method with harsh conditions (high temperature and high pressure), which is not suitable for large-scale production. , so it is necessary to establish a method for preparing metal nanoparticles / graphene / carbon nanotube electromagnetic shielding materials with three-dimensional network structure with simple operation and mild reaction conditions

Method used

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  • Electromagnetic shielding material and nano-grade composite material thereof, and preparation methods thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0041] Embodiment 1, preparation electromagnetic shielding-polymer nanocomposite material

[0042] 1) Preparation of metal nanoparticles / graphene / carbon nanotubes three-dimensional network structure electromagnetic shielding materials

[0043] 100mg of graphene oxide and 100mg of single-walled carbon nanotubes (4nm in diameter and 30μm in length) were ultrasonically dispersed in 200mL of N,N-dimethylformamide solution (1mg / mL), and ultrasonically exfoliated at 25°C Disperse for 1h (ultrasonic power 450W) to obtain graphene oxide / carbon nanotube solution; subsequently, add 116mgNi(NO 3 ) 2 ·6H 2 O (added in the form of its aqueous solution, the concentration is 2mmol / L) and 20mg sodium dodecylbenzenesulfonate (added in the form of its aqueous solution, the concentration is 0.1mg / mL), stir well, add NaOH to adjust the pH of the solution to 10. The above solution was transferred to a test tube and filled with nitrogen gas for 30 minutes, and sealed with 60 Coγ-rays were irra...

Embodiment 2

[0051] Example 2. Preparation of electromagnetic shielding-polymer nanocomposites under different solvent conditions

[0052] 1) Preparation of metal nanoparticles / graphene / carbon nanotubes three-dimensional network structure electromagnetic shielding materials

[0053] The method of step 1) in Example 1 is basically the same, except that the solvent is replaced by ethanol, ethylene glycol, water, tetrahydrofuran or N-methylpyrrolidone in sequence.

[0054] 2) Preparation of electromagnetic shielding-polymer nanocomposites

[0055] Same as the method of 2) step in Example 1.

[0056] The electromagnetic shielding effectiveness of the sample prepared in this embodiment was tested by an electromagnetic shielding test system, and the results are as follows:

[0057] When ethanol is used as the solvent, the electromagnetic shielding effectiveness of the sample prepared under the condition of 8-12GHz is 24.3dB;

[0058] When ethylene glycol is used as the solvent, the electromag...

Embodiment 3

[0062] Example 3. Preparation of electromagnetic shielding-polymer nanocomposites under different metal salt conditions

[0063] 1) Preparation of metal nanoparticles / graphene / carbon nanotubes three-dimensional network structure electromagnetic shielding materials

[0064] With embodiment 1 in 1) the method of step is basically the same, difference is: metal salt is replaced successively by ferric chloride, ferric nitrate, cobalt chloride, nickel acetate, nickel chloride, nickel nitrate, nickel sulfate, gold chloride acid, sodium chloroaurate, silver nitrate, or chloroplatinic acid.

[0065] 2) Preparation of electromagnetic shielding-polymer nanocomposites

[0066] Same as the method of 2) step in Example 1.

[0067] The electromagnetic shielding effectiveness of the sample prepared in this embodiment was tested by an electromagnetic shielding test system, and the results are as follows:

[0068] When the metal salt is iron salt, the electromagnetic shielding effectiveness...

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Abstract

The invention discloses an electromagnetic shielding material and a nano-grade composite material thereof, and preparation methods thereof. The preparation method of the electromagnetic shielding material comprises the following steps: (1) graphene oxide and carbon nano-tube are uniformly dispersed in a solvent I; and an ultrasonic stripping treatment is carried out, such that a graphene oxide / carbon nano-tube mixed solution is obtained; (2) a metal salt water solution and a surfactant are added, such that a metal salt / graphene oxide / carbon nano-tube mixed solution is obtained; and (3) an irradiation treatment is carried out with gamma rays or electron beams, such that the electromagnetic shielding material is obtained. The preparation method of the electromagnetic shielding-polymer nano-grade composite material comprises the following steps: a polymer and the electromagnetic shielding material are uniformly dispersed in a solvent II, such that a mixed liquid is obtained; and solid is collected, such that the composite material is obtained. The method provided by the invention has the advantages of low cost, low solvent toxicity, simple operation, and mild conditions. The use of a vapor deposition method with complicated processes or a water / solvothermal method with harsh conditions is avoided. Therefore, the method has high applicability, and can be used in macro productions. The method has a good application prospect.

Description

technical field [0001] The invention relates to an electromagnetic shielding material and its nanocomposite material and their preparation method, in particular to an electromagnetic shielding material with a metal nanoparticle / graphene / carbon nanotube three-dimensional network structure and its nanocomposite material and their preparation method, belonging to Electromagnetic shielding material preparation field. Background technique [0002] With the rapid development of science and technology and the electronic industry, various electronic instruments and equipment are increasingly used in military and civilian fields, and electromagnetic interference (EMI) caused by electromagnetic waves has become a new social hazard. Electromagnetic waves can cause interference and damage to electronic instruments and equipment, affecting their normal work; electromagnetic waves can cause harm to the human body and seriously damage people's physical and mental health; in addition, elect...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K3/00C08L79/02C08L77/02C08L75/04C08L69/00C08L25/06C08L33/12C08K9/00C08K3/04C08K7/24
Inventor 马慧玲曾心苗翟茂林张龙孙超王连才于宏燕
Owner BEIJING RADIATION APPL RES CENT
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