Method and device for preparing graphene coiled material film through continuous graphitization

Abstract

The invention belongs to the field of graphene material preparation, and particularly relates to a method and device for preparing a graphene coiled material film through continuous graphitization. A reduced graphene oxide film is placed on an unwinding shaft, the reduced graphene oxide film sequentially passes through a liquid sealing feeding area, a double-roller electrifying heating area and a liquid sealing discharging area, and then the graphitized graphene film is wound to obtain the graphene coiled material film. By adopting an immersion liquid sealing method, the sealing performance of the graphitization area can be ensured, oxygen is prevented from entering the graphitization area, and meanwhile, continuous entering of the reduced graphene oxide film into the graphitization area and continuous discharging of the graphene film can be realized. The reduced graphene oxide film can be reloaded in an open system room temperature environment, and the graphene film can also be collected in the open system room temperature environment, so that continuous production is truly realized. The device has the characteristics of continuous and controllable graphitization, continuous and uninterrupted coiled materials, convenience in material replacement and material collection, simplicity in operation, high production efficiency and the like, and is suitable for industrial production of the graphene long coiled materials.

Description

Technical Field

[0001] The present invention belongs to the field of graphene material preparation, and in particular relates to a method and device for preparing a graphene coil film by continuous graphitization. Background Art

[0002] As electronic devices become increasingly miniaturized, the heat flux density of electronic components increases dramatically, leading to a rapid rise in temperature. This severely impacts the performance and lifespan of these devices, making heat dissipation a crucial issue. Graphene, a two-dimensional material with ultra-high thermal conductivity (~5000 W / mK), can achieve a thermal conductivity of up to 1800 W / mK in a macroscopic thin film formed by orderly stacking graphene. This makes it a key material for thermal management in portable electronic devices.

[0003] The patent with publication number CN106829930A proposes a rolled continuous graphene film and its preparation method. It uses PI film as raw material and realizes continuous carbonization and graphitization by rolling the roll horizontally. However, graphitization relies on external heaters for indirect heating, and the energy utilization rate is low. The patent with publication number CN113480328A proposes a large-scale graphene thermal conductive roll film and its preparation method. The roll film is prepared by mixing graphene oxide and nanocellulose. The graphitization still uses a traditional high-temperature furnace and relies on the overall heating of the furnace body. There are problems of time-consuming heating and cooling and high energy consumption, and it cannot solve the problem of ineffective energy consumption of intermittent graphitization. The patent with publication number CN114873587A proposes a graphene thermal conductive film and its preparation method. The thermal conductive film is prepared by physically exfoliating graphene and oriented in a magnetic field. It is clear that no carbonization and graphitization treatment is required to avoid high temperature, but the film thickness is limited and the roll is not formed continuously.

[0004] Currently, the production of graphene thermally conductive films primarily utilizes a sheet-based process, where graphene oxide film is cut into sheets of appropriate size, then subjected to thermal reduction, graphitization, and calendering to obtain fixed-size graphene thermally conductive films. While there are literature and patent reports on graphene roll films, the graphitization process typically utilizes an intermittent method, which is not suitable for continuous production and requires a lengthy heating and cooling cycle. Conventional firing of a single furnace takes three to four days, resulting in high energy consumption and low efficiency. Therefore, there is an urgent need for highly efficient graphitization methods to prepare graphene rolls and achieve low-cost, continuous production of graphene thermally conductive roll films. Summary of the Invention

[0005] In response to the defects of the prior art, the present invention provides a method and apparatus for preparing graphene roll film by continuous graphitization, which overcomes the defects of intermittent graphitization such as long heating and cooling cycles and high energy consumption, eliminates graphite crucible / fixture consumables, and realizes the continuous graphitization of reduced graphene oxide film.

[0006] The technical solution of the present invention is:

[0007] A method for preparing a graphene roll film by continuous graphitization comprises placing a reduced graphene oxide film on a reel, passing the reduced graphene oxide film sequentially through a liquid-sealed feeding zone, a pair of rollers electrically heated zone, and a liquid-sealed discharging zone, and then winding the graphene film after graphitization to obtain the graphene roll film.

[0008] The method for preparing a graphene roll film by continuous graphitization is as follows: the reduced graphene oxide film is placed on a reel; the reduced graphene oxide film is longer than 10 m and has a density range of 0.1 to 2 g / cm 3 , the conductivity is above 10S / cm, the bending radius is below 100mm, and the tension range of the unwinding and rewinding shafts is 1 to 10000N / m.

[0009] In the method for preparing graphene coil film by continuous graphitization, the feed sealing liquid in the liquid sealing feed area and the discharge sealing liquid in the liquid sealing discharge area include but are not limited to one or more of paraffin oil, fluorocarbon compounds, mineral oil, silicone oil, glycerin, and liquid metal, and the length of the reduced graphene oxide film passing through the liquid sealing area is more than 10 mm.

[0010] In the method for preparing graphene roll film by continuous graphitization, the liquid sealed feeding zone and the liquid sealed discharging zone include at least one liquid zone steering shaft with a shaft diameter ranging from 1 to 1000 mm. The liquid zone steering shaft includes but is not limited to one or a combination of two or more of a driven roller shaft, a driving roller shaft, a fixed shaft, and an arc body.

[0011] In the method for preparing graphene coiled film by continuous graphitization, the electrically heated zone of the rollers is wrapped with a heat-insulating material and is filled with an inert atmosphere, and the total length of the electrically heated zone of the rollers is more than 1000 mm.

[0012] The method for preparing graphene roll film by continuous graphitization is described, wherein the electrically heated roller zone includes at least two groups of heating zone roller shafts, the reduced graphene oxide film passes through the middle of the heating zone roller shafts, the linear pressure applied by the heating zone roller shafts is in the range of 10 to 10,000 N / m, and the graphene travel speed is in the range of 1 to 1,000 mm / min; the heating zone roller shafts of the electrically heated roller zone are made of carbon material, including but not limited to one or more of electrode graphite, three-high graphite, isostatic graphite, graphene, and medium-coarse graphite, and the electrical conductivity of the heating zone roller shafts is above 100 S / cm.

[0013] In the method for preparing a graphene roll film by continuous graphitization, a voltage is applied between each pair of rollers of each heating zone. The current is transmitted to the thermally reduced graphene oxide film through one heating zone pair of rollers, and then conducted inwardly through the surface of the thermally reduced graphene oxide film to the other heating zone pair of rollers. The reduced graphene oxide film self-heats under the action of the current. The temperature is controlled by controlling the electric heating power between the two pairs of rollers of the heating zone. The electric heating power range is 1 to 1000 kW, and the maximum heating temperature is 3200°C.

[0014] A device for preparing graphene coil film by continuous graphitization, wherein an upper groove and a lower groove are arranged opposite to each other in the upper and lower directions, and the upper groove is buckled on the outside of the lower groove in the length direction, and the electrified heating zone of the rollers is located on the inner sides of the upper and lower grooves, and an inlet for a reduced graphene oxide film and an outlet for the graphitized graphene film are respectively provided at both ends of the electrified heating zone of the rollers, and the inlet for the reduced graphene oxide film and the outlet for the graphitized graphene film are kept in the same horizontal direction as the roller axis of each group of heating zones; a liquid-sealed feeding zone and a liquid-sealed discharging zone are respectively tightly attached to both sides of the lower groove and are connected to the upper and lower grooves as a whole, and both sides of the upper groove in the length direction extend into the liquid-sealed feeding zone and the liquid-sealed discharging zone respectively, and the lower edges of both sides of the upper groove in the length direction are respectively immersed in the feeding sealing liquid and the discharging sealing liquid to form an immersed liquid sealing structure.

[0015] In the device for preparing graphene roll film by continuous graphitization, the electrically heated zone of the rollers is a rectangular chamber surrounded by insulation material, and more than two groups of heating zone rollers are evenly distributed in the horizontal direction in the rectangular chamber.

[0016] In the device for preparing graphene coiled film by continuous graphitization, the liquid sealing feed area is a trough body filled with feed sealing liquid, and the liquid sealing discharge area is a trough body filled with discharge sealing liquid.

[0017] The device for preparing graphene roll film by continuous graphitization is described. A feed liquid area steering shaft is arranged in the feed sealing liquid of the liquid sealed feed area. A reeling shaft for winding the reduced graphene oxide film is arranged above the liquid sealed feed area. The lower groove is located above one side of the liquid sealed feed area. A steering shaft above the feed liquid area is arranged. The top of the steering shaft above the feed liquid area is flush with the inlet of the reduced graphene oxide film. The reduced graphene oxide film from the reeling shaft is transmitted to the electrified heating zone of the roller in sequence through the feed liquid area steering shaft, the steering shaft above the feed liquid area, and the heating zone roller shaft.

[0018] The device for preparing graphene roll film by continuous graphitization is described, and a discharge liquid area steering shaft is arranged in the discharge sealing liquid of the liquid-sealed discharge area, and a winding shaft for winding the graphene roll film is arranged above the liquid-sealed discharge area. The lower groove is located on one side of the liquid-sealed discharge area, and a steering shaft above the discharge liquid area is arranged above the lower groove. The top of the steering shaft above the discharge liquid area is flush with the outlet of the graphite graphene film. The graphite graphene film from the electrically heated roller counter-roller zone is sequentially transmitted through the heating zone counter-roller shaft, the steering shaft above the discharge liquid area, and the discharge liquid area steering shaft to be wound onto the winding shaft.

[0019] The design concept, advantages and beneficial effects of the present invention are as follows:

[0020] 1. Graphitization is one of the most energy-intensive and costly steps in the graphene film preparation process. It consumes energy at three key points: ① A magnetic induction coil is required to heat a graphite crucible and transfer the heat to the graphene film. The magnetic induction coil's heating efficiency for the graphite crucible is less than 90%. Furthermore, the weight of the graphite crucible is more than twice the weight of the entire graphene film, meaning less than one-third of the heat is used to heat the graphene, resulting in an energy utilization rate of less than 30%. ② Due to the optimal induction distance between the magnetic induction coil and the graphite, the insulation layer is relatively thin, resulting in significant heat loss. This heat needs to be absorbed and removed through an external water cooling system, further increasing energy consumption. ③ The intermittent operation requires significant time for heating and cooling, much of which is ineffective for the graphene film's graphitization process, resulting in inefficient energy consumption. A single heating and cooling cycle typically requires over 72 hours.

[0021] The reduced graphene oxide film has a certain bending and deformation ability, with a bending radius of less than 100mm. It also has a certain electrical conductivity, with an electrical conductivity of more than 10S / cm. By applying a voltage to the surface of the graphene film, an electric current is generated. The Joule heat of the current causes the graphene film to self-heat and reach the temperature required for graphitization. It has three obvious advantages in low energy consumption: 1. It is not limited by the thickness of the insulation layer, and the insulation layer can be increased, thereby reducing heat loss and achieving a maximum temperature of more than 3200°C. 2. Its heating method directly converts electrical energy into graphene thermal energy, without an intermediate heat transfer link, and the energy utilization rate can reach more than 95%. 3. Using a continuous process, the intermediate heating zone maintains a constant temperature, avoiding repeated heating and cooling of the furnace body, thereby greatly reducing the formation of ineffective energy consumption.

[0022] At the same time, due to the continuous graphitization process, the long heating and cooling processes of traditional graphitization are avoided, greatly shortening the entire graphitization time.

[0023] 2. Graphite crucibles are consumable parts in traditional graphitization processes and require regular replacement. At sintering temperatures exceeding 2800 degrees Celsius, the crucible needs to be replaced after every dozens of firings, and the cost of replacing these consumables can be as high as tens to hundreds of thousands of yuan. The present invention uses self-heating graphene membranes, eliminating the need for a heating graphite crucible, significantly reducing the cost of replacing consumables.

[0024] 3. By employing an immersion liquid seal method, the present invention ensures the sealing of the graphitization zone, preventing oxygen ingress, while simultaneously enabling the continuous entry and discharge of the reduced graphene oxide film. The reduced graphene oxide film can be exchanged and collected in an open system at room temperature, achieving truly continuous production. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figures 1-6 The figure is a schematic diagram of the structure of the device for preparing graphene roll film by continuous graphitization of the present invention. Figure 1 For the main view, Figure 2 For top view, Figure 3 for Figure 2 AA section view in Figure 4 For a three-dimensional image, Figure 5 Cross-sectional perspective view, Figure 6 for Figure 5 Enlarged view of point B in .

[0026] In the figure, 1-reduced graphene oxide film, 2-unwinding shaft, 3-feed sealing liquid, 4-feed liquid area steering shaft, 5-feed liquid area upper steering shaft, 6-heating area roller shaft, 7-roller electrified heating area, 8-steering shaft above the discharge liquid area, 9-discharge liquid area steering shaft, 10-discharge sealing liquid, 11-rewinding shaft, 12-graphene roll film, 13-liquid sealing feed area, 14-liquid sealing discharge area, 15-upper groove, 16-lower groove. DETAILED DESCRIPTION

[0027] like Figures 1-6 As shown, the present invention designs a device for preparing a graphene roll film by continuous graphitization, which mainly includes a reduced graphene oxide film 1, a reeling shaft 2, a feed sealing liquid 3, a feed liquid area steering shaft 4, a feed liquid area upper steering shaft 5, a heating area counter-roller shaft 6, a roller energized heating area 7, a discharge liquid area upper steering shaft 8, a discharge liquid area steering shaft 9, a discharge sealing liquid 10, a reeling shaft 11, a graphene roll film 12, a liquid sealing feed area 13, a liquid sealing discharge area 14, an upper groove 15, and a lower groove 16. The specific structure is as follows:

[0028] The upper groove 15 and the lower groove 16 are arranged opposite to each other in the upper and lower directions, and the upper groove 15 is buckled on the outside of the lower groove 16 in the length direction. The roller-side electric heating zone 7 is located on the inner side of the upper groove 15 and the lower groove 16. The roller-side electric heating zone 7 is a rectangular chamber surrounded by thermal insulation material, and more than two groups of heating zone roller shafts 6 are evenly distributed in the horizontal direction in the rectangular chamber. The inlet of the reduced graphene oxide film 1 and the outlet of the graphitized graphene film are respectively provided at both ends of the roller-side electric heating zone 7. The inlet of the reduced graphene oxide film 1 and the outlet of the graphitized graphene film are kept in the same horizontal direction with each group of heating zone roller shafts 6.

[0029] The liquid sealing feed area 13 is a trough body filled with feed sealing liquid 3, and the liquid sealing discharge area 14 is a trough body filled with discharge sealing liquid 10. The liquid sealing feed area 13 and the liquid sealing discharge area 14 are respectively tightly attached to the two sides of the lower groove 16, and are connected to the upper groove 15 and the lower groove 16 as a whole. The two sides of the length direction of the upper groove 15 extend into the liquid sealing feed area 13 and the liquid sealing discharge area 14 respectively, and the lower edges of the two sides of the length direction of the upper groove 15 are respectively immersed in the feed sealing liquid 3 and the discharge sealing liquid 10, forming an immersed liquid seal structure.

[0030] A feed liquid area steering shaft 4 is arranged in the feed sealing liquid 3 of the liquid-sealed feed area 13, and a reeling shaft 2 for winding the reduced graphene oxide film 1 is arranged above the liquid-sealed feed area 13. A feed liquid area upper steering shaft 5 is arranged above the lower groove 16 on one side of the liquid-sealed feed area 13. The top of the feed liquid area upper steering shaft 5 is flush with the inlet of the reduced graphene oxide film 1. The reduced graphene oxide film 1 from the reeling shaft 2 is transmitted to the roller energized heating area 7 through the feed liquid area steering shaft 4, the feed liquid area upper steering shaft 5, and the heating area roller shaft 6 in sequence.

[0031] A discharge liquid area steering shaft 9 is arranged in the discharge sealing liquid 10 of the liquid-sealed discharge area 14, and a winding shaft 11 for winding the graphene roll film 12 is arranged above the liquid-sealed discharge area 14. The lower groove 16 is located above one side of the liquid-sealed discharge area 14, and a discharge liquid area upper steering shaft 8 is arranged. The top of the discharge liquid area upper steering shaft 8 is flush with the outlet of the graphitized graphene film. The graphitized graphene film from the roller-electric heating zone 7 is transmitted and wound to the winding shaft 11 in sequence through the heating zone roller shaft 6, the discharge liquid area upper steering shaft 8, and the discharge liquid area steering shaft 9.

[0032] In the specific implementation process, the method for preparing graphene roll film by continuous graphitization of the present invention places the reduced graphene oxide film on the unwinding shaft, and the reduced graphene oxide film passes through the liquid sealing feeding area, the roller electrified heating area, and the liquid sealing discharging area in sequence, and then the graphitized graphene film is wound through the winding shaft to obtain the graphene roll film. The present invention realizes that the film itself is a heating element, liquid sealing isolation and zoned power control, and the film itself is a heating element: utilizing the conductivity (electrical conductivity is above 10S / cm) and bendability (bending radius is below 100mm) of the reduced graphene oxide film, a voltage is applied by electrifying multiple groups of rollers, so that the current is conducted along the surface of the film to generate self-heating (Joule heat) to reach the graphitization temperature (maximum 3200°C); liquid sealing isolation: combined with the liquid sealing feeding / discharging area (paraffin oil, etc.), the feeding / discharging area is provided with an immersed steering The shaft (diameter 1 to 1000mm) forms a liquid seal barrier (length over 10mm), which ensures that oxygen is isolated from entering the high-temperature zone while allowing the coil to pass continuously to achieve continuous feeding and unloading, ultimately realizing low-energy consumption and high-efficiency continuous graphitization production; zoned power control: multiple groups of rollers (≥2 groups) are set along the belt direction for zoned power supply, and the electric heating power is increased in steps (1 to 1000kW) to achieve temperature gradient and constant temperature zone. By constructing a gradual temperature gradient, it matches the continuous graphitization process.

[0033] The embodiments of the present invention are further described in detail on specific implementation methods of the present invention. The following three embodiments are used to illustrate the present invention but are not intended to limit the scope of the present invention.

[0034] Example 1

[0035] The reduced graphene oxide membrane is 500m long and has a density of 0.95g / cm 3The conductivity is 120 S / cm, the bending radius is 38 mm, and the tension of the unwinding and reeling shafts can be adjusted appropriately within the range of 10 to 100 N / m. The sealing liquid used is paraffin oil. The length of the reduced graphene oxide membrane passing through the liquid seal area is 300 mm. The diameters of the steering shafts in the feed and discharge liquid zones are uniformly 180 mm, and the diameters of the steering shafts above the feed and discharge liquid zones are both 160 mm. All steering shafts are driven rollers. A total of five sets of heating zone rollers are installed. The insulation material of the electrically heated rollers is graphite felt. The entire heating and insulation zone is 9300 mm long. The inert atmosphere is argon. The heating zone rollers are made of isostatically pressed graphite with a conductivity of 1250 S / cm. The axial pressure of the heating zone rollers is 250 N / m. The graphene membrane travels at a speed of 30 mm / min. The five heating zone rollers are numbered A, B, C, D, and E from the feed end to the discharge end. Among them, the electric heating power applied between A and B is 5kW, the electric heating power applied between B and C is 10kW, the electric heating power applied between C and D is 20kW, and the electric heating power applied between D and E is 40kW. The maximum temperature can reach 2990℃.

[0036] In this embodiment, the entire graphitization process from entering the furnace to exiting the furnace only takes 5.6 hours, with a total power of 75kW. In contrast, a traditional industrial graphitization furnace requires a power of 250kW to reach the same temperature.

[0037] Example 2

[0038] The reduced graphene oxide membrane is 500m long and has a density of 0.95g / cm 3 The conductivity is 120 S / cm, the bending radius is 38 mm, and the tension of the unwinding and reeling shafts can be adjusted appropriately within the range of 10 to 100 N / m. The sealing liquid used is paraffin oil. The length of the reduced graphene oxide membrane passing through the liquid seal area is 300 mm. The steering shafts in the feed and discharge liquid zones have a uniform diameter of 180 mm, and the steering shafts above the feed and discharge liquid zones have a diameter of 160 mm. All steering shafts are driven rollers. A total of five sets of heating zone rollers are installed. The insulation material of the electrically heated rollers is graphite felt. The entire heating and insulation zone is 9300 mm long. The inert atmosphere is argon. The heating zone rollers are made of isostatically pressed graphite with a conductivity of 1250 S / cm. The axial pressure of the heating zone rollers is 250 N / m. The graphene membrane travels at a speed of 20 mm / min. The five heating zone rollers are numbered A, B, C, D, and E from the feed end to the discharge end. Among them, the electric heating power applied between A and B is 5kW, the electric heating power applied between B and C is 15kW, the electric heating power applied between C and D is 30kW, and the electric heating power applied between D and E is 50kW. The maximum temperature can reach 3180℃, which is close to the theoretical graphitization limit (3200℃). There are fewer crystal defects and the thermal conductivity may be higher.

[0039] In this embodiment, the entire graphitization process from entering the furnace to exiting the furnace only takes 8.4 hours, with a total power of 100 kW. In contrast, a traditional industrial graphitization furnace requires a power of 300 kW to reach the same temperature.

[0040] Example 3

[0041] The reduced graphene oxide membrane is 500m long and has a density of 0.95g / cm 3 The conductivity is 120 S / cm, the bending radius is 38 mm, and the tension of the unwinding and reeling shafts can be adjusted appropriately within the range of 10 to 100 N / m. The sealing liquid used is paraffin oil. The length of the reduced graphene oxide membrane passing through the liquid seal area is 300 mm. The diameters of the steering shafts in the feed and discharge liquid zones are uniformly 180 mm, and the diameters of the steering shafts above the feed and discharge liquid zones are both 160 mm. All steering shafts are driven rollers. A total of five sets of heating zone rollers are installed. The insulation material of the electrically heated rollers is graphite felt. The entire heating and insulation zone is 9300 mm long. The inert atmosphere is argon. The heating zone rollers are made of isostatically pressed graphite with a conductivity of 1250 S / cm. The axial pressure of the heating zone rollers is 250 N / m. The graphene membrane travels at a speed of 50 mm / min. The five heating zone rollers are numbered A, B, C, D, and E from the feed end to the discharge end. Among them, the electric heating power applied between A and B is 5kW, the electric heating power applied between B and C is 10kW, the electric heating power applied between C and D is 20kW, and the electric heating power applied between D and E is 30kW. The maximum temperature can reach 2910℃.

[0042] In this embodiment, the entire graphitization process from entering the furnace to exiting the furnace only takes 3.4 hours, with a power of 65kW. In contrast, a traditional industrial graphitization furnace requires a power of 180kW to reach the same temperature.

[0043] The above results show that compared to the traditional process, which typically requires more than 72 hours for a single heating and cooling process, Example 3 reduced this time by 95.3%, Example 1 by 92.2%, and Example 2 by 88.3%. Through self-heating and a continuous design, all three examples achieved a 64-70% reduction in energy consumption, shortening the processing time to 3.4-8.4 hours. All three examples achieved continuous graphitization of graphene rolls up to 500 meters in length, resolving the low efficiency and inability to mass-produce traditional sheet production. Furthermore, all three examples covered a temperature range of 2910-3180°C and achieved stable production, demonstrating the process's compatibility with varying graphitization temperature requirements. The present invention enables a controllable graphitization process for reduced graphene oxide rolls, enabling continuous, uninterrupted production. It also features convenient material exchange and collection, simple operation, and efficient production. It has great application value for the industrial production of long graphene rolls. The above three examples further illustrate the present invention, and the preparation process can be modified and improved in various ways. Such modifications and improvements, without departing from the principles of the present invention, should be considered within the scope of the present invention.

Claims

1. A method for preparing a graphene roll film by continuous graphitization, characterized in that: The reduced graphene oxide film is placed on the unwinding shaft, and the reduced graphene oxide film passes through the liquid sealing feeding area, the roller electric heating area, and the liquid sealing discharging area in sequence, and then the graphitized graphene film is rolled up to obtain the graphene roll film.

2. The method for preparing a graphene roll film by continuous graphitization according to claim 1, wherein: The reduced graphene oxide film is placed on the unwinding shaft. The reduced graphene oxide film is more than 10m long and has a density range of 0.1 to 2g / cm 3 , the conductivity is above 10S / cm, the bending radius is below 100mm, and the tension range of the unwinding and rewinding shafts is 1 to 10000N / m.

3. The method for preparing a graphene roll film by continuous graphitization according to claim 1, wherein: The feed sealing liquid in the liquid-sealed feed area and the discharge sealing liquid in the liquid-sealed discharge area include but are not limited to one or more of paraffin oil, fluorocarbon compounds, mineral oil, silicone oil, glycerin, and liquid metal, and the length of the reduced graphene oxide membrane passing through the liquid sealing area is more than 10 mm.

4. The method for preparing a graphene roll film by continuous graphitization according to claim 1, wherein: The liquid sealing feeding area and the liquid sealing discharging area include at least one liquid area steering shaft with a shaft diameter ranging from 1 to 1000 mm. The liquid area steering shaft includes but is not limited to one or a combination of two or more of a driven roller shaft, a driving roller shaft, a fixed shaft, and an arc body.

5. The method for preparing a graphene roll film by continuous graphitization according to claim 1, wherein: The electrically heated area of ​​the rollers is wrapped with heat-insulating materials and filled with an inert atmosphere. The total length of the electrically heated area of ​​the rollers is more than 1000 mm.

6. The method for preparing a graphene roll film by continuous graphitization according to claim 1, wherein: The electrically heated roller zone includes at least two groups of heating zone roller shafts, the reduced graphene oxide film passes through the middle of the heating zone roller shafts, the linear pressure applied by the heating zone roller shafts is in the range of 10 to 10,000 N / m, and the graphene travel speed is in the range of 1 to 1,000 mm / min; the heating zone roller shafts of the electrically heated roller zone are made of carbon material, including but not limited to one or more of electrode graphite, three-high graphite, isostatic graphite, graphene, and medium-coarse graphite, and the electrical conductivity of the heating zone roller shafts is above 100 S / cm.

7. The method for preparing a graphene roll film by continuous graphitization according to claim 6, characterized in that: A voltage is applied between each pair of heating zone rollers. The current is transmitted to the thermally reduced graphene oxide film through one heating zone pair of rollers, and then conducted through the surface of the thermally reduced graphene oxide film to the other heating zone pair of rollers. The reduced graphene oxide film self-heats under the action of the current. The temperature is controlled by controlling the electric heating power between the two pairs of heating zone rollers. The electric heating power range is 1 to 1000kW, and the maximum heating temperature is 3200℃.

8. An apparatus for preparing a graphene roll film by continuous graphitization used in the method according to any one of claims 1 to 7, characterized in that: The upper groove and the lower groove are arranged opposite to each other up and down, and the upper groove is buckled on the outside of the lower groove in the length direction. The electrified heating zone of the roller is located on the inner side of the upper groove and the lower groove. The inlet of the reduced graphene oxide film and the outlet of the graphitized graphene film are respectively provided at both ends of the electrified heating zone of the roller. The inlet of the reduced graphene oxide film and the outlet of the graphitized graphene film are kept in the same horizontal direction with the roller axis of each group of heating zones; the liquid sealing feed zone and the liquid sealing discharge zone are respectively tightly attached to the two sides of the lower groove, and are connected to the upper groove and the lower groove as a whole. The two sides of the upper groove in the length direction extend into the liquid sealing feed zone and the liquid sealing discharge zone respectively, and the lower edges of the two sides of the upper groove in the length direction are respectively immersed in the feed sealing liquid and the discharge sealing liquid, forming an immersed liquid seal structure.

9. The device for preparing a graphene roll film by continuous graphitization according to claim 8, characterized in that: A feed liquid area steering shaft is arranged in the feed sealing liquid of the liquid-sealed feed area, and a reeling shaft for winding the reduced graphene oxide film is arranged above the liquid-sealed feed area. A steering shaft above the feed liquid area is arranged above the lower groove on one side of the liquid-sealed feed area, and the top of the steering shaft above the feed liquid area is flush with the inlet of the reduced graphene oxide film. The reduced graphene oxide film from the reeling shaft is transmitted to the electrified heating zone of the roller through the feed liquid area steering shaft, the steering shaft above the feed liquid area, and the heating zone roller shaft in sequence.

10. The device for preparing graphene roll film by continuous graphitization according to claim 8, characterized in that: A discharging liquid area steering shaft is arranged in the discharging sealing liquid of the liquid-sealed discharging area, a winding shaft for winding the graphene roll film is arranged above the liquid-sealed discharging area, and a steering shaft above the discharging liquid area is arranged above the lower groove on one side of the liquid-sealed discharging area. The top of the steering shaft above the discharging liquid area is flush with the outlet of the graphitized graphene film, and the graphitized graphene film from the electrified heating zone of the rollers is sequentially transmitted through the roller shaft of the heating zone, the steering shaft above the discharging liquid area, and the steering shaft of the discharging liquid area to be wound to the winding shaft.

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