CN113462077A - Preparation method of nitrogen-doped graphene-based high-performance electromagnetic shielding material - Google Patents
Preparation method of nitrogen-doped graphene-based high-performance electromagnetic shielding material Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K9/00—Use of pretreated ingredients
- C08K9/04—Ingredients treated with organic substances
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/02—Elements
- C08K3/04—Carbon
- C08K3/042—Graphene or derivatives, e.g. graphene oxides
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/38—Boron-containing compounds
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- H—ELECTRICITY
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- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K9/00—Screening of apparatus or components against electric or magnetic fields
- H05K9/0073—Shielding materials
- H05K9/0081—Electromagnetic shielding materials, e.g. EMI, RFI shielding
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
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- C08K2003/2265—Oxides; Hydroxides of metals of iron
- C08K2003/2275—Ferroso-ferric oxide (Fe3O4)
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/38—Boron-containing compounds
- C08K2003/382—Boron-containing compounds and nitrogen
- C08K2003/385—Binary compounds of nitrogen with boron
Abstract
The invention discloses a preparation method of a nitrogen-doped graphene-based high-performance electromagnetic shielding material. The preparation method comprises the following steps: adding graphite, a nitrogen-containing compound, a functional assistant and a grinding aid into a millstone type solid-phase mechanochemical reactor for milling, wherein the temperature of the surface of a millstone is controlled to be 20-50 ℃, the pressure is set to be 3-15 MPa, and the milling frequency is controlled to be 5-40 times in the milling process to obtain a nitrogen-doped graphene mixture containing water-soluble impurities; fully washing the obtained mixture with deionized water, and drying to obtain nitrogen-doped graphene; and (3) mixing the obtained nitrogen-doped graphene with a polymer or a rheological regulator by using an internal mixer or a double-screw extruder or a solution method to obtain the nitrogen-doped graphene-based high-performance electromagnetic shielding material. The preparation method of the nitrogen-doped graphene-based high-performance electromagnetic shielding material provided by the invention is convenient and simple, is easy for large-scale production, realizes low-cost preparation of doped graphene, and has great significance in widening application of graphene in the field of high-performance electromagnetic shielding materials.
Description
Technical Field
The invention belongs to the field of electromagnetic shielding materials, and particularly relates to a preparation method of a nitrogen-doped graphene-based high-performance electromagnetic shielding material, in particular to a preparation method of a high-performance electromagnetic shielding material by using a millstone type solid-phase mechanochemical reactor disclosed in Chinese granted patent ZL 95111258.9.
Background
With the rapid development of communication and electronic information technology, electromagnetic wave radiation pollution is receiving more and more attention, so that the development of high-performance electromagnetic shielding materials becomes the focus of attention. Metal materials have been selected as the preferred material for electromagnetic shielding for a long time because of their high surface conductivity, which can effectively reflect electromagnetic waves. However, in addition to high density and rigidity, the surface of the metal material has significant impedance mismatch with air, which makes the electromagnetic shielding mechanism mainly based on reflection, and is easy to generate a large amount of secondary radiation pollution (Xu H, Yin X, Li X, et al acs appl.mater.interfaces2019,11(10), 10198-. These reasons make it difficult to meet the increasing demands of emerging fields such as aerospace and wearable devices. The carbon-based composite material has the characteristics of light weight, flexibility and corrosion resistance, and is considered as a potential candidate material for the next generation of electromagnetic shielding devices by absorbing a dominant electromagnetic shielding mechanism.
Graphene in the carbon material is a two-dimensional layered material, and has high specific surface area and ultrahigh electron mobility. Graphene can be obtained by peeling graphite layer by layer, in addition to good conductivity (10 ∼ 10)6S/cm) also has excellent mechanical properties and heat-conducting properties. Therefore, graphene is widely used as a conductive phase of an electromagnetic shielding material (Lu Y, Zhang S, He M, et al. carbon 2021,178, 413-. The main preparation methods of the graphene at present comprise a chemical vapor deposition method, a mechanical stripping method, an epitaxial growth method and a chemical oxidation-reduction method, wherein the mechanical stripping method has the simplest process and is cyclicAnd (5) protecting. Some researchers realize interlayer slippage and lamella peeling of crystalline Flake Graphite (FG) and expanded graphite (EP) by using a mechanical peeling method to obtain flake graphene, and the flake graphene is compounded with polypropylene to prepare the high-thermal-conductivity graphene composite material (CN 111873283A).
The prepared graphene has self defects and the like, so that the electric conductivity and the theoretical value are often in great difference. Researchers find that nitrogen-doped graphene can be prepared by ball milling graphene and nitrogen-containing compounds such as urea, the conductivity of the doped graphene is improved, and the doped graphene is used in the fields of super capacitors, fuel cells and the like. However, continuous production is difficult to realize by adopting a ball milling method, the milling time is long, and the yield of the nitrogen-doped graphene is limited.
In order to solve the above problems, a millstone type solid-phase mechanochemical reactor reported in the prior art (ZL 95111258.9) can be combined to realize efficient solid-phase doping of graphene. As a mechanochemical apparatus, a millstone-type solid-phase mechanochemical reactor is often used for comminuting and mixing polymer-based materials, during the milling of which a mechanochemical reaction is initiated. Compared with ball milling, the method can provide strong three-dimensional shearing force and extrusion force, and can more efficiently initiate mechanochemical reaction. At present, no relevant literature reports that the nitrogen-doped graphene-based electromagnetic shielding material is prepared by using the method. The large-scale production meets the requirement of commercial high-performance nitrogen-doped graphene-based electromagnetic shielding materials, and is the difficulty and key point which need to be broken through urgently in the prior art.
Disclosure of Invention
The invention aims to solve the problems in the background art, and provides a preparation method of a nitrogen-doped graphene-based high-performance electromagnetic shielding material, which can realize large-scale preparation of the nitrogen-doped graphene by taking graphite as a raw material, has a simple and environment-friendly process, is suitable for continuous production, and can obtain a graphene composite material with excellent electromagnetic shielding performance which can reach 20-80 dB (when the thickness of the material is 2mm) and can be improved by 30% compared with the undoped graphene.
In order to achieve the above object, the present invention is achieved by the following technical means.
A preparation method of a nitrogen-doped graphene-based high-performance electromagnetic shielding material comprises the following steps in parts by weight:
(1) premixing 100 parts of graphite, 5-20 parts of nitrogen-containing compound, 10-100 parts of functional additive and 1-5 parts of grinding aid, adding the premixed material into a millstone-shaped solid-phase mechanochemical reactor for grinding, introducing cooling liquid in the grinding process to take away generated heat, controlling the temperature of the surface of the millstone to be 20-50 ℃, the rotating speed to be 30-100 rpm, setting the pressure to be 3-15 MPa, and controlling the grinding times to be 5-40 times to obtain a nitrogen-doped graphene mixture containing water-soluble impurities;
(2) fully washing the obtained mixture with deionized water to remove redundant nitrogen-containing compounds and water-soluble grinding aids, drying to obtain nitrogen-doped graphene, and drying in a vacuum freeze drying or forced air drying manner;
(3) uniformly mixing 10-30 parts of the obtained nitrogen-doped graphene with 100 parts of a polymer by using an internal mixer or a double-screw extruder, wherein the processing temperature is determined according to the type of the polymer, and the screw speed is 30-100 rpm, so as to obtain the nitrogen-doped graphene-based electromagnetic shielding material;
or adding 1-5 parts of the obtained nitrogen-doped graphene and 1-10 parts of a rheology modifier into 20-40 parts of a solvent, stirring for 20-60 min at a rotating speed of 5000-20000 rpm by using a high-speed homogenizer to form a stable high-viscosity dispersion liquid, and freeze-drying or naturally airing the high-viscosity dispersion liquid in a freeze dryer after the endowing to obtain the nitrogen-doped graphene-based electromagnetic shielding material.
The graphite in the method is expanded graphite and crystalline flake graphite.
The nitrogen-containing compound in the method is melamine, urea, ethylenediamine, butanediamine, p-phenylenediamine, pyrrole, pyridine and a mixture of the two, and is used for providing nitrogen.
The functional auxiliary agent is ferroferric oxide, nickel powder, cobalt oxide powder, boron nitride, nano silver wires, carbon nano tubes and cellulose nano fibers, and provides electromagnetic wave absorption performance or is beneficial to graphene intercalation.
The grinding aid used in the method is sodium chloride, calcium carbonate, magnesium oxide, calcium phosphate and silicon dioxide.
The polymer prepared by the above method comprises polyvinylidene fluoride (PVDF), Polyethylene (PE), polypropylene (PP), Thermoplastic Polyurethane (TPU), polyolefin elastomer (POE), polylactic acid (PLA), Polycaprolactone (PCL), polyethylene terephthalate (PET), Polyamide (PA), Polystyrene (PS), polyvinyl chloride (PVC), polybutylene adipate terephthalate (PBAT) and polyethylene oxide (PEO).
The rheology modifier is polyvinyl alcohol (PVA), Cellulose Nanofiber (CNF), polyvinylpyrrolidone (PVP), Polyamide (PA), Polyethylene (PE), polypropylene (PP), Thermoplastic Polyurethane (TPU), polyolefin elastomer (POE), polylactic acid (PLA), polyvinylidene fluoride (PVDF) and polydimethylsiloxane silicone rubber (PDMS).
The solvent used in the above method is water, N-Dimethylformamide (DMF), N-dimethylacetamide (DMAc), dimethyl sulfoxide (DMSO), Tetrahydrofuran (THF), acetone, ethanol, or a mixture thereof.
Compared with the prior art, the invention has the following positive effects:
1. the preparation method of the nitrogen-doped graphene-based high-performance electromagnetic shielding material provided by the invention simultaneously realizes graphite stripping and nitrogen doping based on the three-dimensional shearing force field provided by the millstone-type solid-phase force chemical reactor, and prepares the nitrogen-doped graphene.
2. The doping method adopted by the preparation method of the nitrogen-doped graphene-based high-performance electromagnetic shielding material provided by the invention can use different nitrogen-containing compounds such as melamine, urea, ethylenediamine, butanediamine, p-phenylenediamine, pyrrole and pyridine as nitrogen element sources, and compared with a chemical doping method which needs a specific nitrogen-containing compound as a nitrogen element source, the method has wide applicability and better application prospect.
3. The preparation method of the nitrogen-doped graphene-based high-performance electromagnetic shielding material provided by the invention provides a new idea that the nitrogen-doped graphene prepared by the millstone-type solid-phase mechanochemical reactor is used as the electromagnetic shielding material, and the high-performance battery shielding material can be obtained by blending the nitrogen-doped graphene with a polymer or a rheological modifier in a traditional processing mode, so that the graphene nitrogen doping realized by the millstone-type solid-phase mechanochemical reactor not only improves the conductivity of the graphene, but also obviously improves the electromagnetic shielding performance of the graphene-based composite material (the improvement range is up to 30% compared with that of the undoped graphene-based composite material), the absorption loss in the shielding mechanism is dominant, the secondary pollution of electromagnetic waves caused by the electromagnetic reflection action can be reduced, and the preparation method has important significance in the field of high-performance electromagnetic shielding.
4. According to the preparation method of the nitrogen-doped graphene-based high-performance electromagnetic shielding material, the nitrogen-doped graphene prepared by the millstone-type solid-phase mechanochemical reactor is used as a raw material, the specific preparation mode is flexible, the nitrogen-doped graphene can be prepared by adopting melting processing modes such as banburying, twin-screw extrusion and the like, the nitrogen-doped graphene can also be prepared by adopting a solution method, the preparation process is simple, the types of the prepared shielding materials are various, the shielding performance can be adjusted by changing the content of the graphene, the requirements of different application occasions can be met, and the customized preparation is realized.
Drawings
FIG. 1 is a Scanning Electron Microscope (SEM) comparison of graphite before and after milling
FIG. 2 is a comparison graph of Raman spectra of pure graphite, graphene with different milling times and nitrogen-doped graphene
FIG. 3 is a photo electron spectroscopy (XPS) chart of the prepared nitrogen-doped graphene
Detailed Description
The following detailed description of the embodiments of the present invention is given in conjunction with the examples which are intended to illustrate the present invention and should not be construed as limiting the scope of the present invention, which can be modified and adapted by those skilled in the art.
Example 1
A preparation method of a nitrogen-doped graphene-based high-performance electromagnetic shielding material comprises the following steps:
(1) premixing 100 parts of expanded graphite, 5 parts of melamine, 10 parts of ferroferric oxide particles and 5 parts of sodium chloride, adding the mixture into a millstone-shaped mechanochemical reactor for milling, introducing cooling liquid in the milling process to take away generated heat, controlling the temperature of the surface of the millstone to be below 50 ℃, setting the rotating speed to be 30rpm, setting the pressure to be 5MPa and controlling the milling times to be 40 times, thus obtaining a nitrogen-doped graphene mixture containing water-soluble impurities;
(2) fully washing the obtained mixture with deionized water to remove redundant unreacted melamine and sodium chloride, and carrying out vacuum freeze drying to obtain nitrogen-doped graphene, wherein the drying condition is-60 ℃ and 5 Pa;
(3) uniformly mixing 10 parts of the obtained nitrogen-doped graphene with 100 parts of polypropylene at 190 ℃, wherein the processing temperature is determined according to the types of polymers, the screw speed is set to be 30rpm, and the mixing is carried out for 20min to obtain the nitrogen-doped graphene-based electromagnetic shielding material;
the prepared nitrogen-doped graphene-based electromagnetic shielding material (with the thickness of 2mm) has the electromagnetic shielding performance of 25dB (which is greater than 20dB of the commercial electromagnetic shielding standard).
Example 2
A preparation method of a nitrogen-doped graphene-based high-performance electromagnetic shielding material comprises the following steps:
(1) premixing 100 parts of graphite, 20 parts of urea, 20 parts of boron nitride and 5 parts of calcium carbonate, adding the premixed materials into a millstone-shaped mechanochemical reactor for milling, introducing cooling liquid in the milling process to take away generated heat so as to control the temperature of the disk surface of the millstone to be about 50 ℃, controlling the rotating speed to be 100rpm, setting the pressure to be 6MPa and controlling the milling times to be 20 times, thus obtaining a nitrogen-doped graphene mixture containing water-soluble impurities;
(2) fully washing the obtained mixture with deionized water to remove redundant urea, drying to obtain nitrogen-doped graphene, and drying by blowing at 60 ℃;
(3) uniformly mixing 30 parts of the obtained nitrogen-doped graphene with 100 parts of thermoplastic polyurethane by using a double-screw extruder, and setting the processing temperature to 200 ℃ and the screw speed to 100rpm to obtain the nitrogen-doped graphene-based electromagnetic shielding material;
the prepared nitrogen-doped graphene-based electromagnetic shielding material (with the thickness of 2mm) has the electromagnetic shielding performance of 40 dB.
Example 3
A preparation method of a nitrogen-doped graphene-based high-performance electromagnetic shielding material comprises the following steps:
(1) premixing 100 parts of graphite, 10 parts of ethylenediamine, 100 parts of carbon nanotubes and 3 parts of magnesium oxide, adding the premixed materials into a millstone-shaped mechanochemical reactor for milling, introducing cooling liquid in the milling process to take away generated heat, controlling the temperature of the surface of the millstone to be about 20 ℃, controlling the rotating speed to be 50rpm, setting the pressure to be 10MPa, and controlling the milling times to be 10 times to obtain a nitrogen-doped graphene mixture containing water-soluble impurities;
(2) fully washing the obtained mixture with deionized water to remove redundant ethylenediamine, and drying to obtain nitrogen-doped graphene, wherein the drying mode can adopt vacuum freeze drying under the conditions of-50 ℃ and 6 Pa;
(3) and adding 5 parts of the obtained nitrogen-doped graphene and 10 parts of cellulose nano-fiber into 40 parts of water, stirring for 20min at the rotating speed of 5000rpm by using a high-speed homogenizer to form a stable high-viscosity dispersion liquid, and freeze-drying the high-viscosity dispersion liquid in a freeze dryer under the conditions of-50 ℃ and 6Pa to obtain the nitrogen-doped graphene-based electromagnetic shielding material.
The prepared nitrogen-doped graphene-based electromagnetic shielding material (with the thickness of 2mm) has the electromagnetic shielding performance of 65 dB.
Example 4
A preparation method of a nitrogen-doped graphene-based high-performance electromagnetic shielding material comprises the following steps:
(1) premixing 100 parts of graphite, 20 parts of pyrrole, 10 parts of ferroferric oxide and 1 part of sodium chloride, adding the mixture into a millstone-shaped mechanochemical reactor for milling, introducing cooling liquid in the milling process to take away generated heat, controlling the temperature of the surface of the millstone to be 30 ℃, the rotating speed to be 70rpm, the pressure to be 12MPa, and controlling the milling times to be 20 times to obtain a nitrogen-doped graphene mixture containing water-soluble impurities;
(2) fully washing the obtained mixture with deionized water to remove redundant pyrrole and sodium chloride, drying to obtain nitrogen-doped graphene, and performing vacuum freeze drying in a drying mode at-60 ℃ under 5 Pa;
(3) adding 1 part of the obtained nitrogen-doped graphene and 2 parts of carbon nanotubes into 20 parts of ethanol, stirring for 20min by using a high-speed homogenizer at a rotating speed of 5000rpm to form a stable high-viscosity dispersion liquid, and naturally airing the high-viscosity dispersion liquid in a fume hood after endowing to obtain the nitrogen-doped graphene-based electromagnetic shielding material.
The prepared nitrogen-doped graphene-based electromagnetic shielding material (with the thickness of 2mm) has the electromagnetic shielding performance of 79 dB.
Example 5
A preparation method of a nitrogen-doped graphene-based high-performance electromagnetic shielding material comprises the following steps:
(1) pre-mixing 100 parts of graphite, 10 parts of p-phenylenediamine, 20 parts of nickel powder and 3 parts of silicon dioxide, adding the pre-mixed materials into a millstone-shaped mechanochemical reactor for milling, introducing cooling liquid in the milling process to take away generated heat so as to control the temperature of the disk surface of the millstone to be about 40 ℃, controlling the rotating speed to be 100rpm, setting the pressure to be 15MPa and controlling the milling times to be 5 times, thus obtaining a nitrogen-doped graphene mixture containing water-soluble impurities;
(2) fully washing the obtained mixture with deionized water to remove redundant p-phenylenediamine, and drying to obtain nitrogen-doped graphene, wherein the drying mode can adopt 40 ℃ forced air drying;
(3) and adding 5 parts of the obtained nitrogen-doped graphene and 5 parts of PVP into 30 parts of N, N-dimethylformamide, stirring for 60min at a rotation speed of 20000rpm by using a high-speed homogenizer to form a stable high-viscosity dispersion liquid, and naturally drying the high-viscosity dispersion liquid after endowing to obtain the nitrogen-doped graphene-based electromagnetic shielding material. The prepared nitrogen-doped graphene-based electromagnetic shielding material (with the thickness of 2mm) has the electromagnetic shielding performance of 58 dB.
Claims (10)
1. A preparation method of a nitrogen-doped graphene-based high-performance electromagnetic shielding material is characterized in that the method is characterized by comprising the following process steps and conditions:
(1) premixing 100 parts of graphite, 5-20 parts of nitrogen-containing compound, 10-100 parts of functional additive and 1-5 parts of grinding aid, adding the premixed material into a grinding disc-shaped mechanochemical reactor for grinding, introducing cooling liquid in the grinding process to take away generated heat, controlling the temperature of the disc surface of the grinding disc to be 20-50 ℃, the rotating speed to be 30-100 rpm, setting the pressure to be 3-15 MPa, and controlling the grinding times to be 5-40 times to obtain a nitrogen-doped graphene mixture containing water-soluble impurities;
(2) fully washing the obtained mixture with deionized water to remove redundant nitrogen-containing compounds and water-soluble grinding aids, drying to obtain nitrogen-doped graphene, and drying in a vacuum freeze drying or forced air drying manner;
(3) uniformly mixing 10-30 parts of the obtained nitrogen-doped graphene with 100 parts of a polymer by using an internal mixer or a double-screw extruder, wherein the processing temperature is determined according to the type of the polymer, and the screw speed is 30-100 rpm, so as to obtain the nitrogen-doped graphene-based electromagnetic shielding material;
or adding 1-5 parts of the obtained nitrogen-doped graphene and 1-10 parts of a rheology modifier into 20-40 parts of a solvent, stirring for 20-60 min at a rotating speed of 5000-20000 rpm by using a high-speed homogenizer to form a stable high-viscosity dispersion liquid, and freeze-drying or naturally airing the high-viscosity dispersion liquid in a freeze dryer after the endowing to obtain the nitrogen-doped graphene-based electromagnetic shielding material.
2. The method for preparing the nitrogen-doped graphene-based high-performance electromagnetic shielding material according to claim 1, wherein the graphite is expanded graphite or flake graphite.
3. The method for preparing the nitrogen-doped graphene-based high-performance electromagnetic shielding material according to claim 1, wherein the nitrogen-containing compound is melamine, urea, ethylenediamine, butanediamine, p-phenylenediamine, pyrrole, pyridine or a mixture of the two.
4. The method for preparing the nitrogen-doped graphene-based high-performance electromagnetic shielding material according to claim 1, wherein the functional auxiliary agent is ferroferric oxide, nickel powder, cobalt oxide powder, boron nitride, silver nanowires, carbon nanotubes, and cellulose nanofibers, and provides electromagnetic wave absorption performance or facilitates graphene intercalation.
5. The method of claim 1, further comprising: the grinding aid in the step (1) is sodium chloride, calcium carbonate, magnesium oxide, calcium phosphate and silicon dioxide.
6. The method of claim 1, further comprising: the polymer in the step (3) comprises polyvinylidene fluoride (PVDF), Polyethylene (PE), polypropylene (PP), Thermoplastic Polyurethane (TPU), polyolefin elastomer (POE), polylactic acid (PLA), Polycaprolactone (PCL), polyethylene terephthalate (PET), Polyamide (PA), Polystyrene (PS), polyvinyl chloride (PVC), polybutylene adipate-polybutylene terephthalate (PBAT) and polyethylene oxide (PEO).
7. The method of claim 1, further comprising: the rheology modifier in the step (3) is polyvinyl alcohol (PVA), Cellulose Nanofiber (CNF), polyvinylpyrrolidone (PVP), Polyamide (PA), Polyethylene (PE), polypropylene (PP), Thermoplastic Polyurethane (TPU), polyolefin elastomer (POE), polylactic acid (PLA), polyvinylidene fluoride (PVDF) and polydimethylsiloxane silicone rubber (PDMS).
8. The method of claim 1, further comprising: the solvent in the step (3) is water, N-Dimethylformamide (DMF), N-dimethylacetamide (DMAc), dimethyl sulfoxide (DMSO), Tetrahydrofuran (THF), acetone, ethanol and a mixed solvent thereof.
9. The nitrogen-doped graphene-based high-performance electromagnetic shielding material prepared by the method of claim 1, wherein the contained nitrogen-doped graphene is prepared by utilizing a millstone type solid-phase mechanochemical reactor.
10. The nitrogen-doped graphene-based high-performance electromagnetic shielding material prepared by the method of claim 1 is characterized in that the electromagnetic shielding performance is 20-80 dB when the thickness of the material is 2 mm.
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| CN115403853A (en) * | 2022-09-30 | 2022-11-29 | 万华化学（宁波）有限公司 | Composite material for shielding direct/alternating current high-voltage cable and preparation method thereof |
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| CN115403853B (en) * | 2022-09-30 | 2024-04-09 | 万华化学（宁波）有限公司 | Composite material for shielding direct-current/alternating-current high-voltage cable and preparation method thereof |
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