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Graphene-based three-dimensional porous electromagnetic shielding material suitable for high-temperature and humid environments

An electromagnetic shielding material, graphene-based technology, applied in the direction of heat exchange materials, chemical instruments and methods, etc., can solve the problems of low electrical conductivity, poor thermal conductivity, and reduce graphene, and achieve high specific surface area, excellent hydrophobic effect, The effect of high porosity

Active Publication Date: 2019-10-25
江苏盖姆纳米材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, the hybrid airgel based on graphene oxide / metal oxide disclosed in Chinese patent CN 102941042 B has a conductivity of only 10 -5 - 10 2 S / m -1 ; Chinese patent CN 103407996 A discloses a method for preparing graphene with an iron-nickel alloy as the substrate material and ethylbenzene as the carbon source through high-temperature treatment above 1000 ° C. The conductivity of the obtained graphene does not exceed 2300 Sm -1 ; Chinese patent CN 104229786 A uses graphene oxide powder as raw material, after being treated with potassium hydroxide, lysine, methionine and sucrose successively, the conductivity of the graphene obtained is lower than 1800 S m -1 . Low electrical conductivity undoubtedly reduces the absorption and weakening effect of graphene on electromagnetic waves, and the thermal conductivity of graphene oxide or reduced graphene oxide is poor, and its own instability is not suitable for high heat, rainy, humid work used in the environment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Preparation of graphene-based three-dimensional porous electromagnetic shielding material suitable for high temperature and humid environment:

[0024] Step 1: Soak the melamine sponge directly in an alkaline aqueous solution of sodium hydroxide with a mass fraction of 20%, and keep it at 90°C for 20 minutes; take it out and rinse it with clean water until neutral, squeeze out the water and place it in a temperature condition of 100°C dry;

[0025] Step 2: 16% epoxy resin by mass composition, 40% phenolic resin, 15% terpineol, 6% binder, 8% curing agent, 5% N-methylpyrrolidone, conductive graphene or graphite microflakes 10%, after mechanical stirring for 90 min, roll rolling for 10 h, and continue ball milling for 60 h to obtain the preparation of graphene-based viscous slurry;

[0026] Step 3: Preparation of graphene-based conductive paste: add dichloromethane as a diluent to the obtained viscous slurry, wherein the diluent accounts for 80% of the total mass of the c...

Embodiment 2

[0030]Concrete implementation is with reference to embodiment 1, difference is:

[0031] Step 3: The diluent accounts for 70% of the total mass of the conductive paste and the diluent, first mechanically stirred for 60 minutes and then ultrasonically dispersed for 70 minutes to obtain a uniformly dispersed conductive paste;

[0032] Step 4: Curing the melamine sponge composite containing the conductive paste at a temperature of 185°C for 50 minutes;

[0033] Step 5: The contact angle of the obtained three-dimensional porous material with respect to water is 131°, and the electrical conductivity can reach 9.31 x 10 3 SM -1 , at a frequency of 400 MHz, its electromagnetic shielding effectiveness is 56 dB.

Embodiment 3

[0035] The specific implementation is with reference to embodiment 2, and the difference is:

[0036] Step 3: The diluent accounts for 60% of the total mass of the conductive paste and the diluent;

[0037] Step 4: The curing time is 60 minutes;

[0038] Step 5: The resulting three-dimensional porous material has a contact angle of 135° and an electrical conductivity of 1.02 x 10 4 S m -1 , at a frequency of 1000 MHz, its electromagnetic shielding effectiveness is 67 dB.

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Abstract

The invention relates to a graphene-based three-dimensional porous electromagnetic shielding material. Melamine sponge obtained after alkaline solution treatment is washed to be neutral, the dried melamine sponge is soaked in diluted graphene-based conductive slurry for adsorption and extrusion, then the melamine sponge is dried and cured after being soaked and extruded again, and the graphene-based three-dimensional porous electromagnetic shielding material is obtained. The graphene raw material used in the diluted graphene-based conductive slurry is a conductive graphene or graphite microchip stripped from natural graphite ore through the high-temperature micromechanical stripping technology, and is good in dispersity in a polar organic reagent. The thickness of graphene is 1-9 nm, the particle size is 3-12 micrometers, and conductivity is 1*105 Sm <-1> or above. In the frequency range of 10 kHz-40 GHz, the electromagnetic shielding efficiency of the obtained three-dimensional shielding material is 35-75 dB. Hydrophobic modification is conducted on the electromagnetic shielding material, so the contact angle of the shielding material relative to water can reach 164 degrees at most, and accordingly the shielding material is suitable for high-temperature, rainy and humid work environments.

Description

technical field [0001] The invention belongs to the technical field of graphene electromagnetic shielding materials, in particular to a graphene-based three-dimensional porous hydrophobic electromagnetic shielding material. Background technique [0002] Due to the rapid development of wireless broadcasting, TV signal transmission, and microwave technology, various electrical and electronic equipment are widely used, and the power of radio frequency equipment has doubled, and the electromagnetic radiation on the ground has increased significantly, which has reached the level of direct threat to human health. Electromagnetic pollution is recognized as the fourth largest public hazard after air pollution, water pollution and noise pollution. The information security problems caused by the leakage of electromagnetic waves will also directly threaten the political, economic and military security of the country. Therefore, how to reduce the intensity of electromagnetic radiation,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J9/42C08J9/40C08L61/28C09K5/14
CPCC08J9/40C08J9/42C08J2361/28C09K5/14
Inventor 沈文沈寒松蒋益鑫
Owner 江苏盖姆纳米材料科技有限公司