CN115448297A - Method for enhancing longitudinal heat-conducting property of graphene heat-conducting film, graphene heat-conducting film and application of graphene heat-conducting film - Google Patents
Method for enhancing longitudinal heat-conducting property of graphene heat-conducting film, graphene heat-conducting film and application of graphene heat-conducting film Download PDFInfo
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- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 216
- 229910021389 graphene Inorganic materials 0.000 title claims abstract description 215
- 238000000034 method Methods 0.000 title claims abstract description 41
- 230000002708 enhancing effect Effects 0.000 title claims abstract description 26
- 239000002002 slurry Substances 0.000 claims abstract description 55
- 238000003490 calendering Methods 0.000 claims abstract description 15
- 238000001035 drying Methods 0.000 claims abstract description 13
- 238000011049 filling Methods 0.000 claims abstract description 12
- 238000003763 carbonization Methods 0.000 claims abstract description 10
- 238000005087 graphitization Methods 0.000 claims abstract description 10
- 239000010408 film Substances 0.000 claims description 162
- 238000000576 coating method Methods 0.000 claims description 28
- 239000011248 coating agent Substances 0.000 claims description 26
- 239000007787 solid Substances 0.000 claims description 18
- 238000004080 punching Methods 0.000 claims description 17
- 239000002904 solvent Substances 0.000 claims description 10
- 238000002156 mixing Methods 0.000 claims description 7
- 238000005553 drilling Methods 0.000 claims description 6
- 238000002360 preparation method Methods 0.000 claims description 4
- 239000010409 thin film Substances 0.000 claims description 3
- 238000010345 tape casting Methods 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 7
- 230000000052 comparative effect Effects 0.000 description 10
- 239000011295 pitch Substances 0.000 description 10
- 230000002349 favourable effect Effects 0.000 description 7
- 230000009286 beneficial effect Effects 0.000 description 6
- 239000000463 material Substances 0.000 description 5
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 4
- KFZMGEQAYNKOFK-UHFFFAOYSA-N Isopropanol Chemical compound CC(C)O KFZMGEQAYNKOFK-UHFFFAOYSA-N 0.000 description 4
- ZMXDDKWLCZADIW-UHFFFAOYSA-N N,N-Dimethylformamide Chemical compound CN(C)C=O ZMXDDKWLCZADIW-UHFFFAOYSA-N 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- SECXISVLQFMRJM-UHFFFAOYSA-N N-Methylpyrrolidone Chemical compound CN1CCCC1=O SECXISVLQFMRJM-UHFFFAOYSA-N 0.000 description 3
- 239000006260 foam Substances 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 239000000758 substrate Substances 0.000 description 3
- 229920002799 BoPET Polymers 0.000 description 2
- 239000006185 dispersion Substances 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 239000010410 layer Substances 0.000 description 2
- 230000000630 rising effect Effects 0.000 description 2
- 238000005096 rolling process Methods 0.000 description 2
- 239000002356 single layer Substances 0.000 description 2
- 238000005411 Van der Waals force Methods 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000010000 carbonizing Methods 0.000 description 1
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- 238000009396 hybridization Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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Classifications
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B32/00—Carbon; Compounds thereof
- C01B32/15—Nano-sized carbon materials
- C01B32/182—Graphene
- C01B32/184—Preparation
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B2204/00—Structure or properties of graphene
- C01B2204/20—Graphene characterized by its properties
- C01B2204/24—Thermal properties
Abstract
The invention provides a method for enhancing longitudinal heat-conducting property of a graphene heat-conducting film, the graphene heat-conducting film and application thereof, and relates to the technical field of graphene heat-conducting films, wherein the method comprises the following steps: filling oxidized graphene slurry in the through holes of the oxidized graphene film with the through holes, and performing drying treatment, carbonization treatment and graphitization treatment and then calendering treatment to obtain the graphene heat-conducting film with enhanced longitudinal heat-conducting property; wherein the aperture of the through hole is 0.01-5mm, and the direction of the through hole is vertical to the extending direction of the graphene oxide film. The method provided by the invention solves the technical problem of poor longitudinal heat conduction performance of the graphene heat conduction film, achieves the technical effects of strong operability, not only ensures the heat conduction performance of the graphene heat conduction film in the horizontal direction, but also effectively improves the longitudinal heat conduction performance of the graphene heat conduction film.
Description
Technical Field
The invention relates to the technical field of graphene heat-conducting films, in particular to a method for enhancing longitudinal heat-conducting performance of a graphene heat-conducting film, the graphene heat-conducting film and application of the graphene heat-conducting film.
Background
Single layer graphene is carbon sp 2 The graphene heat-conducting film is formed by hybridization and is a two-dimensional sheet material with a six-membered ring structure, the graphene heat-conducting film is formed by two layers of single-layer graphene in a stacking mode, and Van der Waals force is applied between the two layers, so that horizontal heat conductivity in the plane of the graphene heat-conducting film is achievedThe graphene thermal conductive film has excellent longitudinal thermal conductivity, so that the application range of the graphene thermal conductive film is greatly limited.
In view of the above, the present invention is particularly proposed.
Disclosure of Invention
One of the purposes of the invention is to provide a method for enhancing the longitudinal heat conduction performance of a graphene heat conduction film, which has strong operability, can ensure the heat conduction performance of the graphene heat conduction film in the horizontal direction, and can effectively improve the longitudinal heat conduction performance of the graphene heat conduction film.
The second purpose of the present invention is to provide a graphene thermal conductive film having excellent longitudinal thermal conductive properties.
The third objective of the present invention is to provide an application of the graphene thermal conductive film in thermal conduction, which can achieve better thermal conduction and has a prominent application effect.
In order to achieve the above purpose of the present invention, the following technical solutions are adopted:
in a first aspect, a method for enhancing longitudinal thermal conductivity of a graphene thermal conductive film includes the following steps:
filling oxidized graphene slurry in the through holes of the oxidized graphene film with the through holes, and performing drying treatment, carbonization treatment and graphitization treatment and then calendering treatment to obtain the graphene heat-conducting film with enhanced longitudinal heat-conducting property;
the aperture of the through hole is 0.01-5mm;
the direction of the through hole is vertical to the extending direction of the graphene oxide film.
Further, the aperture of the through hole is 0.05-3mm;
preferably, the pitch of the through holes is 0.015 to 10mm, preferably 0.1 to 6mm.
Further, the through hole is formed in a mode of punching;
preferably, the drilling includes at least one of mechanical drilling and laser drilling.
Further, the method for filling the graphene oxide slurry into the through hole comprises the steps of filling in a coating mode;
preferably, the coating comprises at least one of roll coating and knife coating;
preferably, the solid content of the graphene oxide slurry is 5-8%.
Further, the pressure of the rolling treatment is 1000 to 20000kN, and may be more preferably 5000 to 15000kN.
Further, the temperature of the carbonization treatment is 1000-2000 ℃;
the temperature of the graphitization treatment is 2000-3200 ℃.
Further, the preparation method of the graphene oxide film comprises the following steps:
mixing graphene oxide with a solvent to obtain a slurry, coating and drying to obtain a graphene oxide film;
preferably, the solids content of the slurry is 1-10%, and may preferably be 3-8%.
In a second aspect, a graphene thermal conductive film is prepared by any one of the methods for enhancing longitudinal thermal conductivity of the graphene thermal conductive film.
Further, the density of the graphene heat conduction film is 1.5-2.3g/cm 3 ；
Preferably, the horizontal thermal conductivity coefficient of the graphene thermal conductive film is 1000-2000W/mK;
preferably, the longitudinal thermal conductivity of the graphene thermal conductive film is 5-500W/mK.
In a third aspect, a graphene thermal conductive film according to any one of the above embodiments is used for thermal conduction.
Compared with the prior art, the invention has at least the following beneficial effects:
according to the method for enhancing the longitudinal heat-conducting property of the graphene heat-conducting film, the graphene oxide slurry is filled in the through hole of the graphene oxide film with the through hole, and then the graphene oxide slurry is subjected to rolling treatment to obtain the graphene heat-conducting film with the enhanced longitudinal heat-conducting property; wherein the aperture of the through hole is 0.01-5mm, and the direction of the through hole is vertical to the extending direction of the graphene oxide film. According to the method provided by the invention, graphene oxide slurry is filled in through holes with specific apertures on a graphene oxide film, and graphene oxide can be directionally arranged in the tiny through holes in the vertical direction, so that the longitudinal arrangement of the graphene oxide film is enhanced, and the graphene heat-conducting film with enhanced longitudinal heat-conducting property is obtained after calendaring; the method provided by the invention has strong operability, not only ensures the heat conduction performance of the graphene heat conduction film in the horizontal direction, but also effectively improves the longitudinal heat conduction performance of the graphene heat conduction film.
The graphene heat conduction film provided by the invention has excellent heat conduction performance in the horizontal direction, and also has excellent longitudinal heat conduction performance, and the heat conduction performance in the horizontal direction and the longitudinal heat conduction performance are both excellent.
The application of the graphene heat-conducting film in heat conduction can realize better heat conduction and has a prominent application effect.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments, and it should be understood that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
According to a first aspect of the present invention, there is provided a method for enhancing longitudinal thermal conductivity of a graphene thermal conductive film, comprising the following steps:
filling oxidized graphene slurry in the through holes of the oxidized graphene film with the through holes, and performing drying treatment, carbonization treatment and graphitization treatment and then calendering treatment to obtain the graphene heat-conducting film with enhanced longitudinal heat-conducting property; wherein the aperture of the through hole is 0.01-5mm, and typical but non-limiting apertures thereof are, for example, 0.01mm, 0.05mm, 0.1mm, 0.2mm, 0.5mm, 0.8mm, 1mm, 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm, 5mm, and the direction of the through hole is perpendicular to the extending direction of the graphene oxide film.
In the present invention, the direction of the through-hole being perpendicular to the extending direction of the graphene oxide film means that the direction of the through-hole is perpendicular to the longitudinal direction and the width direction of the graphene oxide film along the thickness direction of the graphene oxide film.
The method for enhancing the longitudinal heat-conducting property of the graphene heat-conducting film provided by the invention is characterized in that graphene oxide slurry is filled in through holes with specific apertures on a graphene oxide film, and graphene oxide can be directionally arranged in the vertical direction in the tiny through holes, so that the longitudinal arrangement of the graphene oxide film is enhanced, and the graphene heat-conducting film with enhanced longitudinal heat-conducting property is obtained through calendering treatment; the method provided by the invention has strong operability, not only ensures the heat conduction performance of the graphene heat conduction film in the horizontal direction, but also effectively improves the longitudinal heat conduction performance of the graphene heat conduction film.
In a preferred embodiment, the diameter of the through holes in the present invention may be 0.05-3mm, and the pitch of the through holes may be 0.015-10mm, and typical but non-limiting pitches thereof are, for example, 0.015mm, 0.02mm, 0.04mm, 0.06mm, 0.08mm, 0.1mm, 0.2mm, 0.4mm, 0.6mm, 0.8mm, 1mm, 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, and may preferably be 0.1-6mm, which is more beneficial for enhancing the longitudinal thermal conductivity of the graphene thermal conductive film.
In a preferred embodiment, the through holes are formed by, but not limited to, punching, and the specific manner of punching is not particularly limited in the present invention, and the punching manner commonly used in the art may be, for example, at least one of mechanical punching and laser punching, but is not limited thereto, and is more favorable for forming the through holes on the graphene oxide film.
According to the invention, the dried graphene oxide film is punched by means of mechanical punching and/or laser punching, and the punching direction is vertical to the length direction and the width direction of the graphene oxide film along the thickness direction of the graphene oxide film, so that the porous graphene oxide film with the upper and lower through holes is obtained, the operation is easy, the efficiency is high, and the punching effect is good.
In a preferred embodiment, the method for preparing the graphene oxide thin film according to the present invention comprises the steps of:
the graphene oxide film is prepared by mixing graphene oxide and a solvent to obtain a slurry, coating and drying the slurry to obtain a graphene oxide film, wherein the solvent includes but is not limited to at least one of water, DMF, NMP, ethanol and isopropanol, the solid content of the slurry can be 1-10%, and the typical but non-limiting solid content of the slurry is, for example, 1%, 2%, 3%, 4%, 5%, 6%, 7%, 8%, 9%, 10%, and preferably 3-8%, which is more favorable for coating and film forming of the slurry, has a good film forming effect, and is favorable for subsequent processes.
A typical preparation method of a graphene oxide film comprises the following steps:
mixing graphene oxide and a solvent to prepare slurry with the solid content of 1-10%, wherein the solvent can be at least one of water, DMF (dimethyl formamide), NMP (N-methyl pyrrolidone), ethanol and isopropanol, and performing high-speed dispersion, filtration and defoaming treatment to obtain uniform slurry, and the solid content of the uniform slurry can be further preferably 3-8%;
coating the obtained slurry on a substrate, drying, and separating the film from the substrate to obtain the dried graphene oxide film, wherein the substrate includes but is not limited to at least one of a PET film, a PI film and a mesh fabric.
The preparation method of the graphene oxide film is beneficial to obtaining the graphene oxide film with better film performance, and further beneficial to carrying out subsequent processes to obtain the graphene heat-conducting film with enhanced longitudinal heat-conducting performance.
In the present invention, the method for filling the graphene oxide slurry into the through hole of the graphene oxide film is not particularly limited, and for example, the graphene oxide film may be filled by a coating method, but is not limited thereto, and the specific coating method of the present invention is not particularly limited, and for example, the graphene oxide film may be at least one of roll coating and knife roll coating, which is more favorable for filling the graphene oxide slurry into the through hole of the graphene oxide film better, and is favorable for improving the longitudinal thermal conductivity of the graphene thermal conductive film.
In the invention, the roller coating mode is that the gap between the upper metering roller and the coating roller below the upper metering roller is accurately adjusted to the thickness size of the graphene oxide film with the through hole, when the graphene oxide slurry and the graphene oxide film with the through hole pass through, the redundant part is scraped, the graphene oxide slurry is only left in the through hole of the graphene oxide film with the through hole and is completely filled, and then the subsequent treatment process can be carried out after the graphene oxide slurry is dried; the knife roll coating mode is that the gap between the scraper and the supporting roll is accurately adjusted to the thickness size of the graphene oxide film with the through hole, when graphene oxide slurry and the graphene oxide film with the through hole pass through, redundant parts are scraped, the graphene oxide slurry is only left in the through hole in the graphene oxide film with the through hole and is completely filled, and then the subsequent treatment process can be carried out after drying.
In a preferred embodiment, the solid content of the graphene oxide slurry may be 5-8%, and a typical but non-limiting solid content is, for example, 5%, 6%, 7%, 8%, which is more favorable for filling the graphene oxide slurry in the through holes and enhancing the longitudinal thermal conductivity of the graphene thermal conductive film, while if the solid content of the graphene oxide slurry is too high, coating is difficult and air remains in the holes, and if the solid content of the graphene oxide slurry is too low, the thickness in the through holes after the dry film is lower than other positions, which is not favorable for enhancing the longitudinal thermal conductivity of the graphene thermal conductive film.
In a preferred embodiment, the pressure of the calendering process is 1000-20000kN, and its typical but non-limiting pressure is, for example, 1000kN, 2000kN, 4000kN, 6000kN, 8000kN, 10000kN, 12000kN, 14000kN, 16000kN, 18000kN, 20000kN, and may preferably be 5000-15000kN, which is beneficial to improve the calendering effect of the graphene film.
In a preferred embodiment, the temperature of the carbonization treatment in the present invention is 1000-2000 ℃, and the typical but non-limiting temperature thereof is, for example, 1000 ℃, 1200 ℃, 1400 ℃, 1600 ℃, 1800 ℃, 2000 ℃, and the temperature of the graphitization treatment is 2000-3200 ℃, and the typical but non-limiting temperature thereof is, for example, 2000 ℃, 2200 ℃, 2400 ℃, 2600 ℃, 2800 ℃, 3000 ℃, 3200 ℃, which is beneficial to improve the overall performance of the graphene thermal conductive film.
A typical method for enhancing longitudinal heat conduction performance of a graphene heat conduction film comprises the following steps:
(a) Preparing graphene oxide into slurry, coating the slurry to form a film, and drying the film to obtain a primary dried graphene oxide film;
wherein, the solid content of the slurry is 1-10%, and can be preferably 3-8%;
(b) Punching the surface of the primary dried graphene oxide film obtained in the step (a) to form through holes communicated with the upper surface and the lower surface, so as to obtain a graphene oxide film with the through holes;
the punching direction is along the thickness direction of the graphene oxide film and is vertical to the length direction and the width direction of the graphene oxide film; the aperture of the through holes is 0.01-5mm, the pitch of the through holes is 0.015-10mm, and the pitch can be preferably 0.1-6mm;
wherein, the perforation mode includes but is not limited to at least one of mechanical perforation and laser perforation;
(c) Coating the graphene oxide slurry on the graphene oxide film with the through holes obtained in the step (b) to enable the graphene oxide slurry to be filled in the through holes, and drying to obtain a secondary dried graphene oxide film;
wherein, the coating mode comprises but is not limited to at least one of roll coating and knife roll coating;
wherein the graphene oxide slurry is prepared by mixing graphene oxide and a solvent, and the solid content of the graphene oxide slurry is 5-8%;
(d) Carbonizing and graphitizing the twice-dried graphene oxide film obtained in the step (c) to obtain a graphene foam film, and then performing calendering treatment to obtain a graphene heat-conducting film with enhanced longitudinal heat-conducting property;
wherein the carbonization treatment temperature is 1000-2000 deg.C, the graphitization treatment temperature is 2000-3200 deg.C, and the calendering treatment pressure is 1000-20000kN, preferably 5000-15000kN.
The method for enhancing the longitudinal heat-conducting property of the graphene heat-conducting film provided by the invention can effectively improve the longitudinal heat-conducting property of the graphene heat-conducting film, has strong operability, can ensure the heat-conducting property of the graphene heat-conducting film in the horizontal direction, and can effectively improve the longitudinal heat-conducting property of the graphene heat-conducting film.
According to a second aspect of the present invention, there is provided a graphene thermal conductive film, which is prepared by any one of the methods for enhancing longitudinal thermal conductivity of the graphene thermal conductive film.
The density of the graphene heat-conducting film provided by the invention is 1.5-2.3g/cm 3 For example, it may be 1.5g/cm 3 、1.8g/cm 3 、2.0g/cm 3 、2.1g/cm 3 、2.2g/cm 3 、2.3g/cm 3 But are not limited thereto; the horizontal thermal conductivity of the graphene thermal conductive film is 1000-2000W/mK, such as 1000W/mK, 1200W/mK, 1400W/mK, 1600W/mK, 1800W/mK, 2000W/mK, but not limited thereto; the longitudinal thermal conductivity of the graphene thermal conductive film is 5-500W/mK, and can be 5W/mK, 20W/mK, 50W/mK, 100W/mK, 150W/mK, 200W/mK, 250W/mK, 300W/mK, 350W/mK, 400W/mK, 450W/mK and 500W/mK, for example.
The graphene heat conduction film provided by the invention has excellent heat conduction performance in the horizontal direction, and also has excellent longitudinal heat conduction performance, and the heat conduction performance in the horizontal direction and the longitudinal heat conduction performance are both excellent.
According to a third aspect of the present invention, there is provided a use of the graphene thermal conductive film according to any one of the above aspects in thermal conduction.
The application of the graphene heat conduction film in heat conduction can realize better heat conduction and has a prominent application effect.
The invention is further illustrated by the following examples. The materials in the examples are prepared according to known methods or are directly commercially available, unless otherwise specified.
Example 1
A method for enhancing longitudinal heat conduction performance of a graphene heat conduction film comprises the following steps:
1) Mixing graphene oxide and a solvent to prepare slurry with the solid content of 5%, and performing high-speed dispersion, filtration and defoaming treatment to obtain uniformly dispersed slurry;
wherein the solvent is water;
2) Coating the slurry obtained in the step 1) on a base material, drying to form a film, and separating the film from the base material to obtain a primary dried graphene oxide film;
wherein the base material is a PET film;
3) Punching the primary dried graphene oxide film obtained in the step 2) to obtain a porous graphene oxide film with upper and lower through holes;
the punching direction is along the thickness direction of the graphene oxide film and is vertical to the length direction and the width direction of the graphene oxide film; the aperture of the through holes is 1mm, and the pitch of the through holes is 2mm;
wherein, the punching mode is mechanical punching;
4) Coating the graphene oxide slurry on the graphene oxide film with the through holes obtained in the step 3), filling the graphene oxide slurry in the through holes, and drying to obtain a secondary dried graphene oxide film;
the coating mode is roll coating, specifically, a gap between an upper metering roll and a coating roll below the upper metering roll is accurately adjusted to the thickness of the graphene oxide film with the through hole, when graphene oxide slurry and the graphene oxide film with the through hole pass through, redundant parts are scraped, and the graphene oxide slurry is only left in the through hole of the graphene oxide film with the through hole and is completely filled;
the graphene oxide slurry is prepared by mixing graphene oxide and solvent water, and the solid content of the graphene oxide slurry is 6%;
5) Carrying out carbonization and graphitization heat treatment on the secondarily dried graphene oxide film obtained in the step 4) to obtain a graphene foam film;
wherein the carbonization temperature is 1200 ℃, the heating rate is 0.1-1 ℃/min from room temperature to 500 ℃, and the heating rate of other temperatures is 2-10 ℃/min;
the graphitization temperature is 2850 ℃, the temperature rising rate is 0.1-1 ℃/min from room temperature to 500 ℃, and the temperature rising rate of other temperatures is 2-10 ℃/min;
6) Performing calendaring treatment on the graphene foam film obtained in the step 5) to obtain a graphene heat-conducting film with enhanced longitudinal heat-conducting property;
wherein the pressure of the calendering was 12000kN.
Examples 2 to 3
The difference between the embodiments 2 to 3 and 1 is that the solid contents of the slurry in the step 1) of the embodiments 2 to 3 are 3% and 8% in sequence, and the rest is the same as that in the embodiment 1, so that the graphene thermal conductive film with the enhanced longitudinal thermal conductive performance is obtained.
Example 4
The difference between this embodiment and embodiment 1 is that, in step 3) of this embodiment, the aperture of the through hole is 0.01mm, the pitch of the through holes is 1mm, and the rest is the same as that in embodiment 1, so as to obtain the graphene thermal conductive film with enhanced longitudinal thermal conductivity.
Example 5
The difference between this embodiment and embodiment 1 is that, in step 3) of this embodiment, the aperture of the through hole is 5mm, the pitch of the through holes is 6mm, and the rest is the same as that in embodiment 1, so as to obtain the graphene thermal conductive film with enhanced longitudinal thermal conductivity.
Examples 6 to 7
Examples 6 to 7 are different from example 1 in that the solid contents of the graphene oxide slurry in step 4) of examples 6 to 7 are 5% and 8% in this order, and the rest is the same as example 1, so as to obtain the graphene thermal conductive film with enhanced longitudinal thermal conductive performance.
Examples 8 to 10
Examples 8 to 10 are different from example 1 in that the pressure of the calendering treatment in step 6) of examples 8 to 10 was 5000kN, 10000kN and 15000kN in this order, and the rest was the same as example 1, and a graphene thermal conductive film with enhanced longitudinal thermal conductive performance was obtained.
Comparative example 1
The difference between the present comparative example and example 1 is that the primarily dried graphene oxide thin film obtained in step 2) of the present comparative example is not subjected to the treatment of step 3) and step 4) but directly subjected to the treatment of step 5) and step 6), so as to obtain the graphene thermal conductive film.
Comparative example 2
The difference between the comparative example and the example 1 is that in the step 3) of the comparative example, the aperture of the through holes is 6mm, the pitch of the through holes is 7mm, and the rest is the same as that in the example 1, so that the graphene heat-conducting film is obtained.
Comparative example 3
The difference between the comparative example and the example 1 is that in the step 3) of the comparative example, the aperture of the through holes is 0.005mm, the pitch of the through holes is 2mm, and the rest is the same as that in the example 1, so that the graphene heat-conducting film is obtained.
Test examples
The graphene thermal conductive films obtained in examples 1 to 10 and comparative examples 1 to 3 were subjected to thermal conductivity tests, and the results are shown in table 1, wherein the specific test method is a laser flash method.
TABLE 1
As can be seen from table 1, according to the method for enhancing the longitudinal heat conductivity of the graphene heat conductive film, provided by the invention, the graphene oxide slurry is filled in the through holes with the specific apertures on the graphene oxide film, and the graphene oxide in the tiny through holes can be directionally arranged in the vertical direction, so that the longitudinal arrangement of the graphene oxide film is enhanced, and the graphene heat conductive film with the enhanced longitudinal heat conductivity is obtained through calendaring; the method provided by the invention has strong operability, not only ensures the heat conduction performance of the graphene heat conduction film in the horizontal direction, but also effectively improves the longitudinal heat conduction performance of the graphene heat conduction film.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and these modifications or substitutions do not depart from the spirit of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. A method for enhancing longitudinal heat conduction performance of a graphene heat conduction film is characterized by comprising the following steps:
filling oxidized graphene slurry in the through holes of the oxidized graphene film with the through holes, and performing drying treatment, carbonization treatment and graphitization treatment and then calendering treatment to obtain the graphene heat-conducting film with enhanced longitudinal heat-conducting property;
the aperture of the through hole is 0.01-5mm;
the direction of the through hole is vertical to the extending direction of the graphene oxide film.
2. The method for enhancing the longitudinal thermal conductivity of the graphene thermal conductive film according to claim 1, wherein the aperture of the through hole is 0.05-3mm;
preferably, the pitch of the through holes is 0.015 to 10mm, preferably 0.1 to 6mm.
3. The method for enhancing the longitudinal thermal conductivity of the graphene thermal conductive film according to claim 2, wherein the through holes are formed by punching;
preferably, the drilling includes at least one of mechanical drilling and laser drilling.
4. The method for enhancing the longitudinal thermal conductivity of the graphene thermal conductive film according to claim 1, wherein the method for filling the graphene oxide slurry into the through hole includes filling by coating;
preferably, the coating comprises at least one of roll coating and knife coating;
preferably, the solid content of the graphene oxide slurry is 5-8%.
5. The method for enhancing the longitudinal thermal conductivity of the graphene thermal conductive film according to claim 1, wherein the pressure of the calendering process is 1000-20000kN, preferably 5000-15000kN.
6. The method for enhancing the longitudinal thermal conductivity of the graphene thermal conductive film according to claim 1, wherein the temperature of the carbonization treatment is 1000-2000 ℃;
the temperature of the graphitization treatment is 2000-3200 ℃.
7. The method for enhancing the longitudinal thermal conductivity of the graphene thermal conductive film according to any one of claims 1 to 6, wherein the preparation method of the graphene oxide thin film comprises the following steps:
mixing graphene oxide with a solvent to obtain a slurry, coating and drying to obtain a graphene oxide film;
preferably, the solids content of the slurry is 1-10%, preferably 3-8%.
8. A graphene thermal conductive film, which is prepared by the method for enhancing the longitudinal thermal conductive performance of the graphene thermal conductive film according to any one of claims 1 to 7.
9. The graphene thermal conductive film according to claim 8, wherein the graphene thermal conductive film has a density of 1.5-2.3g/cm 3 ；
Preferably, the horizontal thermal conductivity coefficient of the graphene thermal conductive film is 1000-2000W/mK;
preferably, the longitudinal thermal conductivity of the graphene thermal conductive film is 5-500W/mK.
10. Use of the graphene thermal conductive film of claim 8 or 9 for thermal conduction.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211034515.4A CN115448297A (en) | 2022-08-26 | 2022-08-26 | Method for enhancing longitudinal heat-conducting property of graphene heat-conducting film, graphene heat-conducting film and application of graphene heat-conducting film |
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