CN115056546A - Graphene electromagnetic shielding film with high thermal conductivity and high electric conductivity - Google Patents
Graphene electromagnetic shielding film with high thermal conductivity and high electric conductivity Download PDFInfo
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- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 146
- 229910021389 graphene Inorganic materials 0.000 title claims abstract description 127
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- B32B9/007—Layered products comprising a layer of a particular substance not covered by groups B32B11/00 - B32B29/00 comprising one layer of ceramic material, e.g. porcelain, ceramic tile comprising carbon, e.g. graphite, composite carbon
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- B32B9/00—Layered products comprising a layer of a particular substance not covered by groups B32B11/00 - B32B29/00
- B32B9/04—Layered products comprising a layer of a particular substance not covered by groups B32B11/00 - B32B29/00 comprising such particular substance as the main or only constituent of a layer, which is next to another layer of the same or of a different material
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- C01B32/198—Graphene oxide
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- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K7/00—Constructional details common to different types of electric apparatus
- H05K7/20—Modifications to facilitate cooling, ventilating, or heating
- H05K7/2039—Modifications to facilitate cooling, ventilating, or heating characterised by the heat transfer by conduction from the heat generating element to a dissipating body
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- H05K9/0081—Electromagnetic shielding materials, e.g. EMI, RFI shielding
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Abstract
The invention belongs to the technical field of graphene, and particularly relates to a graphene electromagnetic shielding film with high thermal conductivity and high electric conductivity. According to the method, the graphite oxide containing 40-60 wt% of water is directly stripped at high temperature, so that the process of drying the graphite oxide is omitted, the energy consumption is low, and the production cost is low; compared with the method for preparing the slurry by directly dispersing the graphite oxide, the slurry prepared by the method after high-temperature stripping has higher concentration which can reach 3-20 wt%.
Description
Technical Field
The invention belongs to the technical field of graphene, and particularly relates to a graphene electromagnetic shielding film with high thermal conductivity and high electric conductivity.
Background
Heat conduction and heat dissipation have important application requirements in many fields such as electronics, communication, illumination, aviation, national defense and military industry and the like. The mainstream heat conducting materials in the market are still mainly aluminum and copper or alloys thereof, and in recent years, graphite heat conducting films are widely applied and rapidly occupy the market share of traditional materials. The graphene heat conduction film has the following advantages: the heat conductivity coefficient is higher than 300-1500 w/m.k, and is higher than that of various aluminum alloys and simple substance copper materials; and the weight is 25% lighter than that of aluminum and 75% lighter than that of copper.
The method for preparing the highly-oriented graphene heat-conducting film by using graphite oxide at present comprises the following steps: firstly, graphite oxide is dispersed in a solvent to form graphene oxide slurry, the graphene oxide slurry is coated on a base material in a spraying, blade coating or extrusion coating mode, a graphene oxide film is formed through drying, and then the graphene oxide film is subjected to chemical reduction or thermal reduction to obtain a graphene film (such as CN 105084858A). In the preparation process in the mode, the solid content of the graphene oxide slurry is very low (0.5-2%), a large amount of solvent needs to be removed in the drying process, and great energy consumption is needed, and due to the temperature resistance of the graphene oxide film, the surface appearance of the graphene oxide film is poor when the graphene oxide film is dried at the temperature higher than 100 ℃, and finally the prepared graphene heat-conducting film cannot be accepted by customers. Secondly, drying graphite oxide to prepare powder or particles, peeling at high temperature to prepare thin graphene sheets, dispersing the graphene sheets in a solvent to prepare slurry, coating the slurry on a substrate in a spraying, blade coating or extrusion coating mode, drying to form a graphene film, and performing thermal reduction to obtain the graphene film (adv. Mater.2014, 26(26):4521-6) with high thermal conductivity.
Therefore, the development of the graphene electromagnetic shielding film with high thermal conductivity and high electrical conductivity has great economic significance.
Disclosure of Invention
The invention aims to solve the technical problems that in the prior art, the graphene oxide slurry with lower solid content is required for preparing a graphene heat-conducting membrane, the energy consumption is high due to the need of removing a solvent at high temperature, and the appearance of the surface of the graphene oxide membrane is poor in the process of removing the solvent at high temperature; secondly, the problems of complex process, high energy consumption and high cost of preparing the graphene heat-conducting film by drying and stripping are solved; the graphene electromagnetic shielding film with high thermal conductivity and high electric conductivity is provided.
According to one aspect of the present invention, the present invention provides a graphene electromagnetic shielding thin film with high thermal conductivity and high electrical conductivity, comprising the following steps:
1) processing graphite oxide containing 40-60 wt% of water into strips by using a screw extruder, and then cutting the strips into granules to obtain graphite oxide granules; the particle size of the graphite oxide particles is 1-5 mm;
2) stripping the graphite oxide particles obtained in the step 1) at high temperature through a high-temperature furnace, and protecting the stripping process by adopting nitrogen or argon to prepare graphene oxide powder; the high-temperature stripping temperature range is 800-1500 ℃; in the high-temperature stripping process, the smaller the particle size of the particles in the step 1), the shorter the high-temperature stripping treatment time;
3) dispersing the graphene oxide powder in a solvent by using a high-speed dispersion machine to form uniform graphene oxide slurry; the linear speed range of the high-speed dispersion machine is 5-50 m/min; the uniformity degree of dispersion has an important influence on the heat-conducting property of the graphene heat-conducting film, and the more uniform the heat-conducting coefficient is, the higher the heat-conducting coefficient is; the graphene heat-conducting film with the heat-conducting property can be prepared only when the viscosity is 20000-plus 100000mPa.s and the fineness is less than 30 mu m; the high-speed dispersion equipment is provided with the cooling layer, so that the temperature of the slurry can be prevented from rising, and the dispersion effect is prevented from being influenced;
4) defoaming the graphene oxide slurry dispersed in the step 3) under a vacuum condition by using a defoaming machine; the influence on the subsequent process is avoided; bubbles larger than 0.2mm are not allowed, and the content of bubbles smaller than 0.2mm is smaller than 0.02 mL/L; if the bubbles do not meet the requirements, the appearance of the surface of the final graphene heat-conducting film is poor;
5) coating the graphene oxide slurry defoamed in the step 4) on a base material to form a graphene oxide film with a certain thickness by using a scraper coating or extrusion coating mode, and drying the graphene oxide film through a coating machine oven to remove a solvent; then continuously rolling to prepare a coiled material; the base material is a steel belt, PET, a 500-2000 mesh stainless steel net or a 500-1000 mesh nylon net; the thickness is 0.8-3 mm; the drying temperature of the coating machine drying oven is 70-150 ℃; in the process of removing the solvent, due to capillary pressure formed by solvent volatilization, graphene oxide sheets form directional arrangement on an x-y surface; the base material is a steel belt, PET, a stainless steel net with 500-2000 meshes, a nylon net with 500-1000 meshes and the like; the thickness is 0.8-3 mm, and the thickness of the final graphene heat-conducting film is influenced by the coating thickness; the drying temperature of the coating machine oven is 70-150 ℃;
6) stripping the graphene oxide film from the base material by the coiled material in the step 5) through stripping equipment, and then cutting off the edge of the graphene oxide film by adopting edge cutting equipment to form a continuous graphene oxide film coiled material; the peeled base material is cleaned by ultrasonic and dried, and can be reused; the base material is repeatedly used, so that the manufacturing cost can be reduced, and the competitiveness is improved;
7) placing the continuous graphene oxide coiled material prepared in the step 6) into a hot air oven, and heating the coiled material to 150-500 ℃ from room temperature for heat treatment;
8) placing the graphene oxide subjected to the preliminary reduction treatment by the hot air oven in the step 7) into a high-temperature induction heating furnace, and heating the graphene oxide to 2200-2800 ℃ from room temperature for heat treatment; the defects of the graphene sheets are repaired and rearranged, the graphitization degree is improved, and the heat conductivity coefficient of the material is improved;
9) rolling or vacuum rolling the graphene film subjected to high-temperature graphitization treatment in the step 8), so as to improve the density, wherein the rolling pressure is 10-30 MPa;
10) and (3) transferring the graphene film rolled in the step 9) or rolled in the vacuum state onto a silica gel protective film to form a final product.
The graphene electromagnetic shielding film with high heat conductivity and high electrical conductivity has the further technical scheme that the size of the sheet layer of the graphene oxide powder obtained in the step 2) is 2-10 microns, and the number of the layers of the graphene oxide powder is 1-8.
According to the graphene electromagnetic shielding film with high thermal conductivity and high electrical conductivity, the further technical scheme is that the solvent in the step 3) is a mixed solvent composed of any one or more of ethanol, water, NMP, DMF, furan and tetrahydrofuran.
According to the graphene electromagnetic shielding film with high heat conductivity and high electric conductivity, the further technical scheme is that the concentration of graphene oxide in the graphene oxide slurry in the step 3) is 3-20 wt%.
The graphene electromagnetic shielding film with high thermal conductivity and high electrical conductivity has the further technical scheme that the heating rate of the hot air oven in the step 7) is 1-3 ℃/min.
The graphene electromagnetic shielding film with high thermal conductivity and high electrical conductivity has the further technical scheme that the temperature rise rate of the high-temperature induction heating furnace in the step 8) is 2-10 ℃/min.
The density range of the graphene heat-conducting film prepared by the method is 0.015-2.21 g/cm 3; the thickness range of the graphene heat conduction film is 8-1000 mu m; the heat conductivity coefficient of the graphene heat-conducting film is 800-1900W/m.K; the shielding performance of the graphene heat-conducting film is that the electromagnetic frequency is in the range of 30M-3 GHz, and the electromagnetic shielding effectiveness of the graphene heat-conducting film is 60-90 dB; the conductivity of the graphene heat-conducting film is 5-20 multiplied by 105S/m; the tensile strength of the graphene heat-conducting film is 20-80 MPa; the bending times of the graphene heat conduction film are more than 30 ten thousand times under the condition of R0.5/180 degrees.
According to the method for continuously preparing the graphene heat-conducting film at low cost, the graphite oxide containing certain moisture is directly stripped at high temperature, so that the energy for drying the graphite oxide can be saved; most of the functional groups on the surface of the graphene sheet obtained by high-temperature stripping are reduced, so that slurry with higher solid content can be obtained by dispersing the obtained graphene sheet in a solvent, and because most of the functional groups of the graphene sheet are lost, the temperature of an oven can be increased, the volatilization speed of the solvent is increased, and the drying efficiency is improved.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the description is intended to be exemplary only, and is not intended to limit the scope of the present invention.
The graphene oxide raw material manufacturer adopted by the invention is SE2430W of Hezhou hexahydric material science and technology limited company or JH005A of Nanjing Jiu and nanometer science and technology limited company; the other reagents are conventional reagents sold in the market, and the high-speed disperser is a double-planet stirrer with a cooling layer.
Example 1
1) Preparing 45 wt% of water graphite oxide into a linear shape by using a screw continuous extrusion device, and then cutting the linear shape into particles to obtain graphite oxide particles, wherein the size of the particles is 1 mm;
2) stripping at high temperature in a high-temperature furnace at 1000 ℃ under the protection of argon, wherein the size of a lamella of the obtained graphene oxide powder is 8 microns, and the number of layers is 6;
3) dispersing graphene oxide powder in ethanol by using high-speed dispersing equipment with the linear speed of 35m/min to form graphene oxide slurry with the solid content of 18 wt%; the viscosity of the slurry is 60450mPa.s, and the fineness is less than 30 mu m;
4) defoaming the prepared graphene oxide slurry under the vacuum of 200pa by using a film defoaming machine;
5) coating the graphene oxide slurry on a PET film in a scraper coating mode, drying the PET film by using an oven of a coating machine, peeling and rolling to obtain the graphene oxide film, wherein the thickness of the graphene oxide film is 0.8mm, and the temperature distribution of the whole drying tunnel of the coating machine is shown in table 1:
table 1 temperature profile of drying tunnel of coating machine
Drying tunnel/section 12345678910111213
temperature/deg.C 859095100110120130120110100958580.
6) Stripping the graphene oxide film from the base material, and cutting off edges at two sides to form a continuous graphene oxide film coiled material;
7) heating from room temperature to 300 ℃ in a hot air oven at the heating rate of 1.5 ℃/min for drying;
8) heating the mixture from room temperature to 2700 ℃ in a high-temperature induction heating furnace at a heating rate of 3 ℃/min under the protection of argon;
9) carrying out vacuum rolling under the pressure of 30 MPa;
10) the adhesive is attached to a silica gel protective film, so that the processing is convenient;
the density of the graphene heat conduction film prepared by the embodiment is 2.0g/cm 3; the thickness of the graphene heat conduction film is 40 micrometers; the heat conductivity coefficient of the graphene heat-conducting film is 1300W/m.K; the conductivity of the graphene heat-conducting film is 7 multiplied by 105S/m; the tensile strength of the graphene heat-conducting film is 65 MPa; the bending times of the graphene heat conduction film are more than 30 ten thousand times under the condition of R0.5/180 degrees.
Example 2
1) Preparing graphite oxide with 48 wt% of water into a linear shape by using a screw rod continuous extrusion device, and then cutting the linear shape into particles to obtain graphene oxide particles, wherein the size of the particles is 3 mm;
2) stripping at high temperature in a high-temperature furnace at 1200 ℃ under the protection of argon, wherein the size of a lamella of the obtained graphene powder is 7 microns, and the number of layers is 5;
3) dispersing graphene oxide powder in water by using high-speed dispersing equipment with a linear speed of 40m/min to form graphene oxide slurry with the solid content of 10 wt%; the viscosity of the slurry is 43000mPa.s, and the fineness is less than 30 mu m;
4) defoaming the prepared graphene oxide slurry under the vacuum of 100pa by using a film defoaming machine;
5) coating the graphene oxide slurry on a 1000-mesh 316L stainless steel net in a scraper coating mode, drying the graphene oxide slurry in an oven of a coating machine, peeling and rolling the graphene oxide slurry to obtain a graphene oxide film, wherein the thickness of the graphene oxide film is 1.0mm, and the drying temperature of the oven of the coating machine is as shown in Table 2:
table 2 temperature profile of drying tunnel of coating machine
Drying tunnel/section 12345678910111213
temperature/deg.C 7585100110120130135125115105958080
6) Stripping the graphene oxide film from the base material, and cutting off edges at two sides to form a continuous graphene oxide film coiled material;
7) heating from room temperature to 350 ℃ in a hot air oven at the heating rate of 1.8 ℃/min;
8) heating the mixture from room temperature to 2500 ℃ in a high-temperature induction heating furnace at a heating rate of 5 ℃/min under the protection of argon;
9) rolling under the pressure of 20 MPa;
10) the adhesive is attached to a silica gel protective film, so that the processing is convenient;
the density of the graphene heat conduction film in the embodiment is 1.68g/cm 3; the thickness of the graphene heat conduction film is 30 micrometers; graphene 5
The heat conductivity coefficient of the heat conducting film is 1500W/m.K; the conductivity of the graphene heat-conducting film is 8 multiplied by 10S/m; the tensile strength of the graphene heat-conducting film is 65 MPa; the bending times of the graphene heat conduction film are more than 30 ten thousand times under the condition of R0.5/180 degrees.
The shielding effectiveness of the graphene film reaches the same performance of metal copper and silver, but the density of the graphene film is only one tenth of that of the metal copper and silver, so that the weight of the graphene film can be greatly reduced for many applications.
Although the embodiments of the present invention have been described in detail, it should be understood that various changes, substitutions, and alterations can be made hereto without departing from the spirit and scope of the invention.
Claims (8)
1. The utility model provides a high heat conduction high conductivity's graphite alkene electromagnetic shield film which characterized in that: the method comprises the following steps:
1) processing graphite oxide containing 40-60 wt% of water into strips by using a screw extruder, and then cutting the strips into granules to obtain graphite oxide granules; the particle size of the graphite oxide particles is 1-5 mm;
2) stripping the oxidized graphene particles obtained in the step 1) at a high temperature through a high-temperature furnace, wherein nitrogen or argon is adopted for protection in the stripping process, and oxidized graphene powder is obtained; the high-temperature stripping temperature range is 800-1500 ℃;
3) dispersing the graphene oxide powder in a solvent by using a high-speed dispersion machine to form uniform graphene oxide slurry; the linear speed range of the high-speed dispersion machine is 5-50 m/min;
4) defoaming the graphene oxide slurry dispersed in the step 3) under a vacuum condition by using a defoaming machine;
5) coating the graphene oxide slurry defoamed in the step 4) on a base material to form a graphene oxide film with a certain thickness by using a scraper coating or extrusion coating mode, and drying the graphene oxide film through a coating machine oven to remove a solvent; then continuously rolling to prepare a coiled material; the base material is a steel belt, PET, a 500-2000 mesh stainless steel net or a 500-1000 mesh nylon net; the thickness is 0.8-3 mm; the drying temperature of the coating machine drying oven is 70-150 ℃;
6) stripping the graphene oxide film from the base material by the coiled material in the step 5) through stripping equipment, and then cutting off the edge of the graphene oxide film by adopting edge cutting equipment to form a continuous graphene oxide film coiled material;
7) placing the continuous graphene oxide coiled material prepared in the step 6) into a hot air oven, heating the coiled material from room temperature to 150-500 ℃ for heat treatment, and carrying out primary reduction on the graphene oxide;
8) placing the graphene oxide subjected to the preliminary reduction treatment by the hot air oven in the step 7) into a high-temperature induction heating furnace, and heating the graphene oxide to 2200-2800 ℃ from room temperature for heat treatment;
9) rolling or vacuum rolling the graphene film subjected to high-temperature graphitization treatment in the step 8), so as to improve the density, wherein the rolling pressure is 10-30 MPa;
10) and (3) transferring the graphene film rolled in the step 9) or rolled in the vacuum state onto a silica gel protective film to form a final product.
2. The method of claim 1, further comprising: the size of the sheet layer of the graphene oxide powder obtained in the step 2) is 2-10 mu m, and the number of layers of the graphene oxide powder is 1-8.
3. The method of claim 1, further comprising: the solvent in the step 3) is any one or more of ethanol, water, NMP, DMF, furan and tetrahydrofuran.
4. The method of claim 1, further comprising: and 3) the concentration of graphene oxide in the graphene oxide slurry in the step 3) is 3-20 wt%.
5. The method of claim 1, further comprising: the viscosity of the graphene oxide slurry in the step 3) is 20000-100000mPa.s, and the fineness is less than 30 mu m.
6. The method of claim 1, further comprising: and 7) the heating rate of the hot air oven in the step 7) is 1-3 ℃/min.
7. The method of claim 1, wherein: and 8) the heating rate of the high-temperature induction heating furnace is 2-10 ℃/min.
8. The method according to any one of claims 1 to 7, wherein: the density of the graphene heat-conducting film is 0.015-2.21 g/cm 3; the thickness range of the graphene heat conduction film is 8-1000 mu m; the heat conductivity coefficient of the graphene heat-conducting film is 800-1900W/m.K; the electromagnetic shielding effectiveness of the graphene heat-conducting film is 5 to 60 dB to 90dB when the electromagnetic frequency of the graphene heat-conducting film is in the range of 30M to 3 GHz; the conductivity of the graphene heat-conducting film is 5-20 multiplied by 10S/m; the tensile strength of the graphene heat-conducting film is 20-80 MPa; the bending times of the graphene heat-conducting film are more than 30 ten thousand times under the detection condition of R0.5/180 degrees.
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| CN108203091A (en) * | 2017-01-23 | 2018-06-26 | 常州富烯科技股份有限公司 | A kind of continuous method for preparing graphene heat conducting film |
| CN114349511A (en) * | 2022-01-18 | 2022-04-15 | 南京工业大学 | Method for rapidly preparing high-conductivity graphene electromagnetic shielding film |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108203091A (en) * | 2017-01-23 | 2018-06-26 | 常州富烯科技股份有限公司 | A kind of continuous method for preparing graphene heat conducting film |
| CN114349511A (en) * | 2022-01-18 | 2022-04-15 | 南京工业大学 | Method for rapidly preparing high-conductivity graphene electromagnetic shielding film |
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