CN111646465A - Production method of ultrathin graphite film - Google Patents
Production method of ultrathin graphite film Download PDFInfo
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- CN111646465A CN111646465A CN202010563876.2A CN202010563876A CN111646465A CN 111646465 A CN111646465 A CN 111646465A CN 202010563876 A CN202010563876 A CN 202010563876A CN 111646465 A CN111646465 A CN 111646465A
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- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 88
- 229910002804 graphite Inorganic materials 0.000 title claims abstract description 88
- 239000010439 graphite Substances 0.000 title claims abstract description 88
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 15
- 238000005087 graphitization Methods 0.000 claims abstract description 49
- 238000000034 method Methods 0.000 claims abstract description 34
- 238000004804 winding Methods 0.000 claims abstract description 29
- 239000002994 raw material Substances 0.000 claims abstract description 25
- 238000005096 rolling process Methods 0.000 claims abstract description 25
- 229910021382 natural graphite Inorganic materials 0.000 claims abstract description 20
- 238000010030 laminating Methods 0.000 claims abstract description 19
- 238000007599 discharging Methods 0.000 claims abstract description 15
- 239000000463 material Substances 0.000 claims abstract description 10
- 238000010000 carbonizing Methods 0.000 claims abstract description 8
- 238000005520 cutting process Methods 0.000 claims abstract description 8
- 238000003763 carbonization Methods 0.000 claims description 42
- 239000011261 inert gas Substances 0.000 claims description 29
- 230000003068 static effect Effects 0.000 claims description 10
- 238000001816 cooling Methods 0.000 claims description 8
- 230000005611 electricity Effects 0.000 claims description 8
- 238000003490 calendering Methods 0.000 claims description 6
- 238000003475 lamination Methods 0.000 claims description 4
- 238000010304 firing Methods 0.000 abstract description 9
- 238000001125 extrusion Methods 0.000 abstract description 3
- 230000017525 heat dissipation Effects 0.000 abstract description 2
- 239000011248 coating agent Substances 0.000 abstract 1
- 238000000576 coating method Methods 0.000 abstract 1
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 12
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 10
- 229910052786 argon Inorganic materials 0.000 description 6
- 229910052757 nitrogen Inorganic materials 0.000 description 5
- 230000007547 defect Effects 0.000 description 4
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 230000008602 contraction Effects 0.000 description 2
- 230000008030 elimination Effects 0.000 description 2
- 238000003379 elimination reaction Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 238000012797 qualification Methods 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- 241001391944 Commicarpus scandens Species 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 229910002091 carbon monoxide Inorganic materials 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
Classifications
-
- 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
- C01B32/20—Graphite
- C01B32/205—Preparation
-
- 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
- C01B32/20—Graphite
- C01B32/21—After-treatment
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- Chemical & Material Sciences (AREA)
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- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Inorganic Chemistry (AREA)
- Carbon And Carbon Compounds (AREA)
Abstract
The invention relates to the technical field of shielding heat dissipation materials, in particular to a production method of an ultrathin graphite film, which comprises the following steps: selecting a PI film raw material and cutting the PI film raw material into specification materials; coating a film; winding the PI film into a roll shape by a PI rewinder; laminating the films; carbonizing; graphitizing; rolling the film: taking out after graphitization, and winding the graphitized product on a tube core on a film winding machine; rolling: the tension of the discharging shaft is controlled to adjust the tightness and the gradient of the graphite film, so that the stress point of the graphite film is always in the middle of the film, and the ultrathin graphite film is obtained; in the invention, in the PI film laminating stage, a reserved space for shrinkage and expansion in the firing stage is set as a layer gap; the core position of the roll is broken when taking out the graphite cylinder before graphitization and changing the graphite cylinder into softer natural graphite paper to prevent graphitization, the PI film can form a fixed shape in the firing process and cannot cause graphite breakage due to extrusion, the natural graphite paper can enable the inner core of the product to be heated uniformly, and the flexibility of the graphite film can be improved.
Description
Technical Field
The invention relates to the technical field of shielding heat dissipation materials, in particular to a production method of an ultrathin graphite film.
Background
The preparation difficulty of the artificially synthesized graphite film has a great relationship with the specification of the product, and generally, the thinner and wider product has higher preparation difficulty. Difficulty one: the thinner the thickness of the PI film raw material is in the firing process, the more difficult the graphitization degree is to control, and the defects of rough products or uneven surfaces and the like are easily caused. Difficulty two: the thinner graphite film is likely to be broken during rolling, and is likely to have defects such as cracks in appearance.
The prior burning technology can not burn products with the thickness less than 15 mu m, because the products are easy to become brittle and the crease marks of the roll core part are deep in the process of burning the products with thin thickness, and the films are easy to break or notch when being rolled, thereby causing a plurality of defects and scrappage.
Disclosure of Invention
The purpose of the invention is: the defects in the prior art are overcome, and the ultrathin graphite film produced by the method has high qualification rate.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
a production method of an ultrathin graphite film comprises the following steps:
s1, selecting a PI film raw material and cutting the PI film raw material into specification materials;
s2, laminating; winding the PI film into a roll shape by a PI rewinder;
s3, laminating the films;
s4, carbonizing;
s5, graphitizing;
s6, rolling the film: taking out after graphitization, and winding the graphitized product on a tube core on a film winding machine;
s7, rolling: the tension of the discharging shaft is controlled to adjust the tightness and the gradient of the graphite film, so that the stress point of the graphite film is always in the middle of the film, and the ultrathin graphite film is obtained.
Further, the thickness of the ultrathin graphite film is 9-15 μm.
Further, the thickness of the PI film stock in step S1 is 20 to 40 μm.
Further, the gap between the layers after the PI film is wound in step S2 is 25 μm to 50 μm.
Further, in the step S2, the PI film is wound and formed, and then is subjected to static electricity removal processing by using a plasma blower.
Further, in the step S3, the film lamination is to place a graphite cylinder in the core of the PI film and wrap natural graphite paper around the PI film.
Further, before carbonization in step S4, air in the carbonization furnace is pumped out, and inert gas is filled to protect the product, wherein the carbonization temperature is 500 ℃ to 1300 ℃, the time lasts for 16H to 25H, and after carbonization, the inert gas is used for replacement and cooling.
Further, the step S5 graphitization includes taking out the graphite barrel in the core after carbonization, and putting natural graphite paper, before graphitization, vacuumizing the furnace, filling with inert gas, and filling inert gas in the whole graphitization process, wherein the graphitization temperature is 1500-3000 ℃, and the graphitization time is 10H-20H.
Furthermore, the tension of the roll film is 0.3-1.5N, the speed of the first 20M is less than 10M/MIN, the speed of the middle 50-100M is less than 50M/MIN, and the speed of the last 20M is less than 30M/MIN.
Further, the specific process of calendering in step S7 includes: the tightness of the graphite film is adjusted by controlling the tension of the discharging shaft: the tension output is controlled to be 10-25% in 0-50 m and 8-18% in 50-100 m.
Further, the calendering speed in the step S7 is: the speed of 0-10 m is 2-4m/min, the speed of 0-50 m is 5-10m/min, and the speed of 50-100 m is 3-15 m/min.
The technical scheme adopted by the invention has the beneficial effects that:
in the invention, a method of setting layer gaps is adopted in the PI film laminating stage to ensure that certain gaps are reserved between each layer of PI film, and space is reserved for shrinkage and expansion in the firing stage.
Before carbonization, argon or nitrogen is added for protection, so that the contact with air is reduced; after carbonization, argon or nitrogen is added to quickly reduce the temperature; argon is added in the graphitization process, so that the contact with air is reduced, the product is protected, and the product can be foamed better.
The graphite cylinder is placed at the position of the winding core in the film laminating stage to prevent creases from being formed in the contraction process in the carbonization stage, and the graphite cylinder is taken out before graphitization and is replaced by soft natural graphite paper to prevent the position of the winding core from being broken when graphitization is carried out. The PI film can form a fixed shape in the firing process, graphite fracture cannot be caused by extrusion, the natural graphite paper can enable the inner core of the product to be heated uniformly, and the flexibility of the graphite film can be improved.
The PI film is subjected to static electricity removal treatment by adopting a plasma fan after being formed in a winding mode, and after static electricity is removed, the PI film can be effectively prevented from being adsorbed together, so that gaps between the PI films are uniform, and adhesion in the firing process is avoided.
The stress point of the graphite film is adjusted in the rolling process, so that cracks can be effectively avoided, and the product qualification rate of the graphite film prepared by the production method is up to 85-95%.
Detailed Description
The following examples are intended to provide those skilled in the art with a more complete understanding of the present invention, and are not intended to limit the scope of the present invention. Reference herein to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic may be included in at least one implementation of the invention. The appearances of the phrase "in one embodiment" in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments.
The production method of the ultrathin graphite film comprises the following steps:
s1, selecting a PI film raw material and cutting the PI film raw material into specification materials;
s2, laminating; winding the PI film into a roll shape by a PI rewinder;
s3, laminating the films;
s4, carbonizing;
s5, graphitizing;
s6, rolling the film: taking out the product after graphitization, winding the product after graphitization on a tube core on a film winding machine, wherein the tension of the wound film is 0.3-1.5N, the speed of the first 20M is less than 10M/MIN, the speed of the middle 50-100M is less than 50M/MIN, and the speed of the last 20M is less than 30M/Min;
s7, rolling: the tension of the discharging shaft is controlled to adjust the tightness and the gradient of the graphite film, so that the stress point of the graphite film is always in the middle of the film, and the ultrathin graphite film is obtained.
The thickness of the ultrathin graphite film is 9-15 mu m and is lower than 9 mu m, the production process requirement is higher, and the product percent of pass is low.
In the invention, the thickness of the PI film raw material in the step S1 is 20-40 μm, and the thickness of the raw material is controlled within the range, so that on one hand, the raw material cost is low, and on the other hand, the process requirement for preparing the ultrathin graphite film with the thickness of 9-15 μm is lower than that of the raw material with higher thickness.
In the invention, the gaps between the layers of the PI film after being wound in the step S2 are 25-50 μm, and a method for setting the layer gaps is adopted in the PI film laminating stage to ensure that certain gaps are reserved between the PI films, so that space is reserved for shrinkage and expansion in the firing stage.
According to the invention, after the PI film is formed by winding, a plasma fan is adopted for static elimination, and after static elimination, the PI film can be effectively prevented from being adsorbed together, so that gaps among the PI films are uniform, and adhesion in the firing process is avoided.
According to the invention, the film lamination is that a graphite cylinder is placed in the PI film core, natural graphite paper is wrapped on the periphery of the PI film core, the graphite cylinder is placed at the position of the roll core in the film lamination stage to prevent creases from being formed in the contraction process in the carbonization stage, the graphite cylinder is taken out before graphitization and is changed into soft natural graphite paper to prevent the roll core from being broken when graphitization is carried out, the PI film can form a fixed shape in the firing process, graphite breakage caused by extrusion cannot occur, the natural graphite paper can enable the inner core of a product to be heated uniformly, and the flexibility of the graphite film can be improved.
According to the invention, before carbonization, air in a carbonization furnace is pumped out, and inert gas is filled to protect a product, wherein the carbonization temperature is 500-1300 ℃, the time lasts for 16-25H, after carbonization is finished, the inert gas is used for replacement and cooling, the inert gas is nitrogen or argon, and the argon or nitrogen is added before carbonization for protection, so that the contact between a PI film and air can be reduced, the generation of carbon monoxide or carbon dioxide due to the reaction of the PI film and oxygen in the carbonization process is avoided, and the argon or nitrogen is added after carbonization for rapid cooling, so that the production efficiency is improved.
The graphitization comprises the steps of taking out the graphite cylinder in the roll core after carbonization, putting natural graphite paper, vacuumizing the furnace before graphitization, filling inert gas and filling the inert gas in the whole graphitization process, wherein the graphitization temperature is 1500-3000 ℃, and the time is 10-20H.
The specific process of calendering in the invention comprises the following steps: the tightness of the graphite film is adjusted by controlling the tension of the discharging shaft: the tension output is controlled to be 10-25% in 0-50 m and 8-18% in 50-100 m. The calendering speed in step S5 is: the speed of 0-10 m is 2-4m/min, the speed of 0-50 m is 5-10m/min, and the speed of 50-100 m is 3-15 m/min. The stress point of the graphite film is adjusted in the rolling process, so that cracks can be effectively avoided, and meanwhile, the tension output and the rolling speed are controlled, so that the qualified rate of products can be improved.
Example 1
A production method of an ultrathin graphite film comprises the following steps:
s1, selecting a PI film raw material and cutting the PI film raw material into specification materials, wherein the thickness of the PI film raw material is 22-23 mu m.
S2, laminating; winding the PI film into a roll shape by a PI rewinder, wherein the clearance between layers after the PI film is wound is 25 mu m, and performing static electricity removal treatment by a plasma fan after the PI film is wound and formed;
s3, film laminating: placing a graphite cylinder in the PI film core, and wrapping natural graphite paper at the periphery;
s4, carbonizing: before carbonization, air in a carbonization furnace is pumped out, and inert gas is filled to protect the product, wherein the carbonization temperature is 500-1300 ℃, the time lasts for 16-25H, and after carbonization is finished, the inert gas is adopted for replacement and cooling;
s5, graphitization: taking out the graphite cylinder in the roll core after carbonization, putting natural graphite paper, vacuumizing the furnace before graphitization, filling by using inert gas, and filling the inert gas in the whole graphitization process, wherein the graphitization temperature is 1500-3000 ℃, and the graphitization time is 10-20H;
s6, rolling the film: taking out after graphitization, winding the graphitized product on a tube core on a film winding machine, wherein the tension of the wound film is 0.3-1.5N, the speed of the first 20M is less than 10M/MIN, the speed of the middle 50-100M is less than 50M/MIN, and the speed of the last 20M is less than 30M/MIN;
s7, rolling: the tension of the discharging shaft is controlled to adjust the tightness and the gradient of the graphite film, so that the stress point of the graphite film is always in the middle of the film, and the ultrathin graphite film is obtained; the tightness of the graphite film is adjusted by controlling the tension of the discharging shaft: the tension output is controlled to be 10 percent between 0 and 50 meters, the tension output is controlled to be 8 percent between 50 and 100 meters, and the rolling speed is as follows: the speed of 0-10 m is 2m/min, the speed of 0-50 m is 5m/min, and the speed of 50-100 m is 3 m/min.
Example 2
A production method of an ultrathin graphite film comprises the following steps:
s1, selecting a PI film raw material and cutting the PI film raw material into specification materials, wherein the thickness of the PI film raw material is 25 mu m.
S2, laminating; winding the PI film into a roll shape by a PI rewinder, wherein gaps among layers of the wound PI film are 30 microns, and performing static electricity removal treatment by a plasma fan after the PI film is wound and formed;
s3, film laminating: placing a graphite cylinder in the PI film core, and wrapping natural graphite paper at the periphery;
s4, carbonizing: before carbonization, air in a carbonization furnace is pumped out, and inert gas is filled to protect the product, wherein the carbonization temperature is 500-1300 ℃, the time lasts for 16-25H, and after carbonization is finished, the inert gas is adopted for replacement and cooling;
s5, graphitization: taking out the graphite cylinder in the roll core after carbonization, putting natural graphite paper, vacuumizing the furnace before graphitization, filling by using inert gas, and filling the inert gas in the whole graphitization process, wherein the graphitization temperature is 1500-3000 ℃, and the graphitization time is 10-20H;
s6, rolling the film: taking out after graphitization, winding the graphitized product on a tube core on a film winding machine, wherein the tension of the wound film is 0.3-1.5N, the speed of the first 20M is less than 10M/MIN, the speed of the middle 50-100M is less than 50M/MIN, and the speed of the last 20M is less than 30M/MIN;
s7, rolling: the tension of the discharging shaft is controlled to adjust the tightness and the gradient of the graphite film, so that the stress point of the graphite film is always in the middle of the film, and the ultrathin graphite film is obtained; the tightness of the graphite film is adjusted by controlling the tension of the discharging shaft: controlling the tension output by 12% at 0-50 m and 10% at 50-100 m, and the rolling speed is as follows: the speed of 0-10 m is 2.5m/min, the speed of 0-50 m is 6m/min, and the speed of 50-100 m is 5 m/min.
Example 3
A production method of an ultrathin graphite film comprises the following steps:
s1, selecting a PI film raw material and cutting the PI film raw material into specification materials, wherein the thickness of the PI film raw material is 30 mu m.
S2, laminating; winding the PI film into a roll shape by a PI rewinder, wherein the clearance between layers after the PI film is wound is 35 mu m, and performing static electricity removal treatment by a plasma fan after the PI film is wound and formed;
s3, film laminating: placing a graphite cylinder in the PI film core, and wrapping natural graphite paper at the periphery;
s4, carbonizing: before carbonization, air in a carbonization furnace is pumped out, and inert gas is filled to protect the product, wherein the carbonization temperature is 500-1300 ℃, the time lasts for 16-25H, and after carbonization is finished, the inert gas is adopted for replacement and cooling;
s5, graphitization: taking out the graphite cylinder in the roll core after carbonization, putting natural graphite paper, vacuumizing the furnace before graphitization, filling by using inert gas, and filling the inert gas in the whole graphitization process, wherein the graphitization temperature is 1500-3000 ℃, and the graphitization time is 10-20H;
s6, rolling the film: taking out after graphitization, winding the graphitized product on a tube core on a film winding machine, wherein the tension of the wound film is 0.3-1.5N, the speed of the first 20M is less than 10M/MIN, the speed of the middle 50-100M is less than 50M/MIN, and the speed of the last 20M is less than 30M/MIN;
s7, rolling: the tension of the discharging shaft is controlled to adjust the tightness and the gradient of the graphite film, so that the stress point of the graphite film is always in the middle of the film, and the ultrathin graphite film is obtained; the tightness of the graphite film is adjusted by controlling the tension of the discharging shaft: controlling the tension output to be 18% at 0-50 m and 12% at 50-100 m, and the rolling speed is as follows: the speed of 0-10 m is 3m/min, the speed of 0-50 m is 7m/min, and the speed of 50-100 m is 6 m/min.
Example 4
A production method of an ultrathin graphite film comprises the following steps:
s1, selecting a PI film raw material and cutting the PI film raw material into specification materials, wherein the thickness of the PI film raw material is 38 mu m.
S2, laminating; winding the PI film into a roll shape by a PI rewinder, wherein the clearance between layers after the PI film is wound is 50 mu m, and performing static electricity removal treatment by a plasma fan after the PI film is wound and formed;
s3, film laminating: placing a graphite cylinder in the PI film core, and wrapping natural graphite paper at the periphery;
s4, carbonizing: before carbonization, air in a carbonization furnace is pumped out, and inert gas is filled to protect the product, wherein the carbonization temperature is 500-1300 ℃, the time lasts for 16-25H, and after carbonization is finished, the inert gas is adopted for replacement and cooling;
s5, graphitization: taking out the graphite cylinder in the roll core after carbonization, putting natural graphite paper, vacuumizing the furnace before graphitization, filling by using inert gas, and filling the inert gas in the whole graphitization process, wherein the graphitization temperature is 1500-3000 ℃, and the graphitization time is 10-20H;
s6, rolling the film: taking out after graphitization, winding the graphitized product on a tube core on a film winding machine, wherein the tension of the wound film is 0.3-1.5N, the speed of the first 20M is less than 10M/MIN, the speed of the middle 50-100M is less than 50M/MIN, and the speed of the last 20M is less than 30M/MIN;
s7, rolling: the tension of the discharging shaft is controlled to adjust the tightness and the gradient of the graphite film, so that the stress point of the graphite film is always in the middle of the film, and the ultrathin graphite film is obtained; the tightness of the graphite film is adjusted by controlling the tension of the discharging shaft: controlling the tension output by 25% at 0-50 m and 18% at 50-100 m, and the rolling speed is as follows: 4m/min at the speed of 0-10 m, 10m/min at the speed of 0-50 m and 15m/min at the speed of 50-100 m.
The performance of the ultra-thin graphite films prepared in examples 1 to 5 was measured, and the specific measurement results are shown in table 1.
TABLE 1
In light of the foregoing description of the preferred embodiment of the present invention, many modifications and variations will be apparent to those skilled in the art without departing from the spirit and scope of the invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention. The technical scope of the present invention is not limited to the content of the specification, and must be determined according to the scope of the claims.
Claims (10)
1. A production method of an ultrathin graphite film is characterized by comprising the following steps: the production method comprises the following steps:
s1, selecting a PI film raw material and cutting the PI film raw material into specification materials;
s2, laminating; winding the PI film into a roll shape by a PI rewinder;
s3, laminating the films;
s4, carbonizing;
s5, graphitizing;
s6, rolling the film: taking out after graphitization, and winding the graphitized product on a tube core on a film winding machine;
s7, rolling: the tension of the discharging shaft is controlled to adjust the tightness and the gradient of the graphite film, so that the stress point of the graphite film is always in the middle of the film, and the ultrathin graphite film is obtained.
2. The method of producing an ultra-thin graphite film of claim 1, wherein: the thickness of the ultrathin graphite film is 9-15 μm.
3. The method of producing an ultra-thin graphite film of claim 1, wherein: the gap between the layers after the PI film is wound in the step S2 is 25-50 μm.
4. The method of producing an ultra-thin graphite film of claim 1, wherein: and in the step S2, after the PI film is formed by winding, a plasma fan is adopted for static electricity removal treatment.
5. The method of producing an ultra-thin graphite film of claim 1, wherein: in the step S3, the film lamination is to place a graphite cylinder in the inner core of the PI film and wrap natural graphite paper around the PI film.
6. The method of producing an ultra-thin graphite film of claim 1, wherein: before carbonization in the step S4, air in the carbonization furnace is pumped out, and inert gas is filled to protect the product, wherein the carbonization temperature is 500-1300 ℃, the time lasts for 16-25H, and after carbonization is finished, the inert gas is used for replacement and cooling.
7. The method of producing an ultra-thin graphite film of claim 1, wherein: and step S5, graphitizing, namely taking out the graphite barrel in the core after carbonization, putting natural graphite paper, vacuumizing the furnace before graphitization, filling inert gas, and filling the inert gas in the whole graphitizing process, wherein the graphitization temperature is 1500-3000 ℃, and the graphitization time is 10-20H.
8. The method of producing an ultra-thin graphite film of claim 1, wherein: the tension of the rolling film is 0.3-1.5N, the speed of the first 20 meters is less than 10M/MIN, the speed of the middle 50-100 meters is less than 50M/MIN, and the speed of the last 20 meters is less than 30M/MIN.
9. The method of producing an ultra-thin graphite film of claim 1, wherein: the specific process of calendering in the step S7 includes: the tightness of the graphite film is adjusted by controlling the tension of the discharging shaft: the tension output is controlled to be 10-25% in 0-50 m and 8-18% in 50-100 m.
10. A method of producing an ultra-thin graphite film according to claim 9, characterised in that: the calendering speed in the step S7 is: the speed of 0-10 m is 2-4m/min, the speed of 0-50 m is 5-10m/min, and the speed of 50-100 m is 3-15 m/min.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116835580A (en) * | 2023-06-26 | 2023-10-03 | 江苏汉华热管理科技有限公司 | Preparation method of single-layer graphite heat conducting film |
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| CN106083051A (en) * | 2016-06-15 | 2016-11-09 | 黄志良 | High conductive graphite heat dissipation film processing technology |
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| CN207903624U (en) * | 2018-01-09 | 2018-09-25 | 北京中石伟业科技无锡有限公司 | Graphite heat conducting film calender line blowing tension automatic regulating device |
| CN108658069A (en) * | 2018-06-26 | 2018-10-16 | 江西德思恩科技有限公司 | It is a kind of to support the technique for solving graphite film web-like formation problems with graphite tube |
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2020
- 2020-06-19 CN CN202010563876.2A patent/CN111646465A/en active Pending
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| CN106083051A (en) * | 2016-06-15 | 2016-11-09 | 黄志良 | High conductive graphite heat dissipation film processing technology |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116835580A (en) * | 2023-06-26 | 2023-10-03 | 江苏汉华热管理科技有限公司 | Preparation method of single-layer graphite heat conducting film |
| CN116835580B (en) * | 2023-06-26 | 2024-02-13 | 江苏汉华热管理科技有限公司 | Preparation method of single-layer graphite heat conducting film |
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Application publication date: 20200911 |