A continuous carbon nanopaper preparation device

Abstract

The present invention relates to the technical field of carbon nanopaper preparation, and provides a continuous carbon nanopaper preparation device, comprising a support, a filter membrane, a reeling device, a reeling device, and a support member, the support member comprising two side plates, each of which is provided with a suction pipe, wherein the suction pipe is used to connect to a vacuum pump; a negative pressure chamber is provided within an annular multi-cavity rotating negative pressure roller, radial micropores are formed between the outer circumferential surface and the negative pressure chamber, and through holes are formed on the end surfaces, communicating with the corresponding negative pressure chambers; two negative pressure sealing fixed rollers contact the ends of the annular multi-cavity rotating negative pressure roller, and are provided with arc-shaped negative pressure grooves inside. The two end surfaces are provided with first and second suction filtration holes communicating with the arc-shaped negative pressure grooves, and the diameter of the second suction filtration hole gradually increases from small to large along the rotation direction of the annular multi-cavity rotating negative pressure roller; and the arc-shaped liquid supply groove is sleeved on the annular multi-cavity rotating negative pressure roller. The present invention can realize continuous preparation of carbon nanopaper, thereby effectively improving the efficiency of carbon nanopaper preparation.

Description

Technical Field

[0001] The present invention relates to the technical field of carbon nanopaper preparation, and in particular to a continuous carbon nanopaper preparation device. Background Art

[0002] Currently, carbon nanopaper is commonly produced by the suspension filtration method. This process involves three steps: preparing a uniformly dispersed carbon nanotube suspension, vacuum filtration, and drying. While the suspension filtration method is relatively simple to operate and process, and when the carbon nanotube suspension is evenly dispersed, the resulting carbon nanopaper exhibits uniform performance. However, this method is primarily used for small-scale laboratory production of carbon nanopaper, and the lack of equipment for continuous carbon nanopaper production results in low carbon nanopaper production efficiency. Summary of the Invention

[0003] The problem solved by the present invention is how to realize continuous preparation of carbon nanopaper to improve the preparation efficiency of carbon nanopaper.

[0004] To solve the above problems, the present invention provides a continuous carbon nanopaper preparation device, comprising a support, a filter membrane, and an unwinding device and a winding device disposed on the support, and further comprising:

[0005] A support member, the support member comprising two side plates, the two side plates being spaced apart and arranged on the bracket, and the two side plates being respectively provided with a suction filter pipe;

[0006] An annular multi-cavity rotating negative pressure roller, the annular multi-cavity rotating negative pressure roller is rotatably connected between the two side plates, a plurality of annularly arranged negative pressure chambers are provided in the annular multi-cavity rotating negative pressure roller, a plurality of radial micro-holes are provided between the outer circumferential surface of the annular multi-cavity rotating negative pressure roller and the negative pressure chambers, and a plurality of through holes are opened on the end surface of the annular multi-cavity rotating negative pressure roller, and each of the through holes is respectively connected to the corresponding negative pressure chamber;

[0007] A negative pressure sealing fixed roller, wherein the two negative pressure sealing fixed rollers are symmetrically arranged on the two side plates, and the two negative pressure sealing fixed rollers are respectively in contact with the two ends of the annular multi-cavity rotating negative pressure roller, an arc-shaped negative pressure groove is arranged inside the negative pressure sealing fixed roller, and the end surface of the negative pressure sealing fixed roller facing away from the annular multi-cavity rotating negative pressure roller is provided with a first suction filtration hole connected to the arc-shaped negative pressure groove, and the two first suction filtration holes are respectively arranged corresponding to the two suction tubes, and the end surface of the negative pressure sealing fixed roller facing the annular multi-cavity rotating negative pressure roller is provided with a plurality of second suction filtration holes distributed along the same arc line, and the diameters of the plurality of second suction filtration holes gradually change along the circumference of the annular multi-cavity rotating negative pressure roller, and the plurality of second suction filtration holes are respectively connected to the arc-shaped negative pressure groove;

[0008] An arc-shaped liquid supply trough, wherein both ends of the arc-shaped liquid supply trough are respectively connected to the two side plates, the arc-shaped liquid supply trough is used to hold the carbon nanotube suspension, and the gap of the arc-shaped liquid supply trough is sleeved outside the annular multi-cavity rotating negative pressure roller;

[0009] The filter membrane is used to be drawn out from the unwinding device, wrap around the annular multi-cavity rotary negative pressure roller, and be connected to the winding device.

[0010] Optionally, the plurality of second filtration holes are respectively tangent to the bottom arc line of the arc-shaped negative pressure groove.

[0011] Optionally, the multiple negative pressure chambers are evenly distributed along the same circumference inside the circumferential multi-cavity rotating negative pressure roller, and the multiple through holes are respectively tangent to the arc lines of the circumferential walls of the multiple negative pressure chambers, and the bottom arc line of the arc-shaped negative pressure groove corresponds to the circumferential wall.

[0012] Optionally, at least one fixing hole is formed on the end surface of the negative pressure sealing fixed roller away from the annular multi-cavity rotating negative pressure roller, and the negative pressure sealing fixed roller is connected to the side plate through the fixing hole.

[0013] Optionally, the arc-shaped liquid supply trough is a semi-cylindrical structure, and a feed pipe and an overflow pipe are provided on the semi-cylindrical structure.

[0014] Optionally, a residual liquid discharge pipe is further provided on the semi-cylinder structure.

[0015] Optionally, the through hole includes a circular hole and a triangular hole.

[0016] Optionally, a vibrator is provided at the bottom of the arc-shaped liquid supply trough.

[0017] Optionally, the continuous carbon nanopaper preparation equipment further comprises a drying lamp, which is arranged on the bracket and between the winding device and the circumferential multi-cavity rotating negative pressure roller.

[0018] Optionally, the continuous carbon nanopaper preparation device further includes a deviation corrector, which is disposed on the bracket and is used to be connected to the filter membrane.

[0019] The present invention's continuous carbon nanopaper production apparatus has the following beneficial effects: During use, an untreated filter membrane is first withdrawn from an unwinding device, wrapped around a circumferential multi-cavity rotary negative pressure roller, and then connected to a rewinding device for winding, thereby tautly tensioning the filter membrane. A dispersed carbon nanotube suspension is continuously injected into an arc-shaped liquid supply tank, whereupon the carbon nanotube suspension contacts the filter membrane. The suction filtration tube on the side plate is connected to the first suction filtration hole on the negative pressure sealing fixed roller, and the vacuum pump connected to the suction filtration tube is started, and the air in the negative pressure cavity at the corresponding position of the annular multi-cavity rotating negative pressure roller is extracted through the corresponding connected first suction filtration hole, the arc-shaped negative pressure groove, the second suction filtration hole and the through hole on the annular multi-cavity rotating negative pressure roller to form a high negative pressure state in the negative pressure cavity. The high negative pressure negative pressure cavity adsorbs the filter membrane to the annular multi-cavity rotating negative pressure roller through the radial micropores opened on the outer circumferential surface of the annular multi-cavity rotating negative pressure roller, and the water in the carbon nanotube suspension is sucked into the negative pressure cavity through the mesh holes of the filter membrane and the radial micropores of the annular multi-cavity rotating negative pressure roller, and then is sucked away by the vacuum pump connected to the suction filtration tube through the through hole, the second suction filtration hole, the arc-shaped negative pressure groove and the first suction filtration hole, and at the same time, the carbon nanotubes in the carbon nanotube suspension are adsorbed on the filter membrane to form carbon nanopaper. Since the filtration pressure applied by the vacuum pump can be constant, when the filter membrane just contacts the carbon nanotube suspension, the filter membrane surface contains only a small amount or no carbon nanotubes, the filtration resistance is small, the negative pressure on the filter membrane surface is large, and the adsorption force on the carbon nanotubes is also large. As the time the filter membrane enters the carbon nanotube suspension gradually increases, the carbon nanotubes deposited on the filter membrane surface gradually increase, the filtration resistance increases, the negative pressure on the filter membrane surface begins to decrease, the adsorption force on the carbon nanotubes also gradually decreases, and the retention rate of the carbon nanotubes on the filter membrane surface begins to decrease, which is not conducive to the formation of carbon nanopaper. Therefore, the two symmetrically arranged negative pressure sealing fixed rollers are arranged at the end face of the annular multi-cavity rotating negative pressure roller. The diameter of the second filtration hole increases from small to large along the rotation direction of the annular multi-cavity rotating negative pressure roller, thereby ensuring that the filtration resistance remains roughly unchanged during the entire filtration process, and the negative pressure on the filter membrane surface is roughly the same, so that the carbon nanotubes are deposited on the filter membrane surface as much and evenly as possible, and finally form To form carbon nanopaper, for example, when the filter membrane just contacts the carbon nanotube suspension, the corresponding second suction filtration hole is the smallest, then at this time the negative pressure caused by the suction tube through the second suction filtration hole to the negative pressure chamber at the corresponding position is the smallest, before the filter membrane rotates out of the carbon nanotube suspension, the corresponding second suction filtration hole is the largest, then at this time the negative pressure caused by the suction tube through the second suction filtration hole to the negative pressure chamber at the corresponding position is the largest, and since the second suction filtration hole gradually becomes larger with the rotation direction of the annular multi-cavity rotating negative pressure roller, the negative pressure on the same negative pressure chamber gradually increases in the process of the filter membrane entering and leaving the carbon nanotube suspension, and the number of carbon nanotubes deposited on the surface of the negative pressure chamber gradually increases, affecting the further adsorption of the carbon nanotubes by the negative pressure chamber. Overall, in the process of the filter membrane entering and leaving the carbon nanotube suspension, the adsorption force of the same negative pressure chamber on the carbon nanotubes in the carbon nanotube suspension is as similar as possible.At the same time, the annular multi-cavity rotary negative pressure roller rotates, driving the filter membrane, and the winding device rotates to rewind the membrane, thus achieving continuous preparation and collection of carbon nanopaper. During operation, the properties of the prepared carbon nanopaper can be controlled by adjusting the speed of the annular multi-cavity rotary negative pressure roller. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic structural diagram of a continuous carbon nanopaper preparation device according to an embodiment of the present invention;

[0021] Figure 2 This is a schematic diagram of the structure of the continuous carbon nanopaper preparation device according to an embodiment of the present invention after the filter membrane is installed;

[0022] Figure 3 Schematic diagram of the structure of the annular multi-cavity rotary negative pressure roller according to an embodiment of the present invention;

[0023] Figure 4 Schematic diagram of the end face structure and the cross-sectional structure of the annular multi-cavity rotary negative pressure roller according to an embodiment of the present invention;

[0024] Figure 5 This is a schematic structural diagram of a negative pressure sealing fixed roller according to an embodiment of the present invention;

[0025] Figure 6 Schematic diagram of the cross-sectional structure of the negative pressure sealing fixed roller according to an embodiment of the present invention;

[0026] Figure 7 Schematic diagram of the installation structure of the annular multi-cavity rotating negative pressure roller, the negative pressure sealing fixed roller and the arc-shaped liquid supply groove according to an embodiment of the present invention;

[0027] Figure 8 This is a schematic diagram of the exploded structure of the annular multi-cavity rotating negative pressure roller, the negative pressure sealing fixed roller and the arc-shaped liquid supply groove installation structure according to an embodiment of the present invention.

[0028] Description of reference numerals:

[0029] 1- filter membrane; 2- bracket; 3- unwinding device; 4- rewinding device; 5- side plate; 51- suction tube;

[0030] 6-annular multi-cavity rotating negative pressure roller; 61-negative pressure cavity; 62-radial micropores; 63-through hole; 631-circular hole; 632-triangular hole; 64-rotating shaft;

[0031] 7-negative pressure sealing fixed roller; 71-arc-shaped negative pressure groove; 72-first suction filter hole; 73-second suction filter hole; 74-fixing hole;

[0032] 8-arc-shaped liquid supply trough; 9-feeding pipe; 10-overflow pipe; 11-residual liquid discharge pipe; 12-vibrator; 13-drying lamp; 14-deviation corrector. DETAILED DESCRIPTION

[0033] To make the above-mentioned objects, features, and advantages of the present invention more clearly understood, specific embodiments of the present invention are described in detail below with reference to the accompanying drawings. Although certain embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be construed as being limited to the embodiments described herein. Instead, these embodiments are provided to provide a more thorough and complete understanding of the present invention. It should be understood that the drawings and embodiments of the present invention are for illustrative purposes only and are not intended to limit the scope of protection of the present invention.

[0034] The term "including" and its variations used in this document are open inclusions, that is, "including but not limited to"; the term "based on" means "based at least in part on"; the term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one other embodiment"; the term "some embodiments" means "at least some embodiments"; the term "optionally" means "optional embodiments". The relevant definitions of other terms will be given in the following description. It should be noted that the concepts of "first", "second", etc. mentioned in the present invention are only used to distinguish different devices, modules or units, and are not used to limit the order or interdependence of the functions performed by these devices, modules or units.

[0035] It should be noted that the modifications of "one" and "multiple" mentioned in the present invention are illustrative rather than restrictive. Those skilled in the art should understand that unless otherwise clearly indicated in the context, it should be understood as "one or more".

[0036] Carbon nanopaper (also known as buckypaper or carbon nanotube film) is a porous film formed by the self-assembly of a large number of carbon nanotubes through the interaction of van der Waals forces, forming a uniform carbon nanotube network. As a macroscopic material of carbon nanotubes, carbon nanopaper offers advantages such as light weight, high strength, corrosion resistance, high thermal conductivity, and high electrical conductivity. It has wide applications in lightning protection, deicing, electromagnetic shielding, sensors, lithium-ion battery electrodes, supercapacitor electrodes, and fiber-reinforced composites.

[0037] The methods for preparing carbon nanopaper include chemical vapor deposition and suspension filtration.

[0038] The principle of chemical vapor deposition (CVD) for producing carbon nanopaper is to use small hydrocarbon molecules as raw materials. Under the action of a catalyst, a high-temperature reaction first forms carbon nanotubes. The carbon nanotubes are then carried out of the reactor by a carrier gas, continuously deposited on a receiving plate, and formed into carbon nanopaper under the action of gas pressure. Currently, CVD can achieve continuous production of carbon nanopaper, but its preparation process is complex and the operation is difficult to control. As a result, the prepared carbon nanopaper is uneven in composition and contains a high content of residual catalyst.

[0039] The more commonly used method is suspension filtration. The equipment for preparing carbon nanopaper using suspension filtration is similar to that for preparing ordinary paper. Therefore, in order to save production costs, improvements are made to the original equipment for preparing ordinary paper, such as vacuum rotary paper machines. However, when faced with the obvious differences in properties and concentrations between the pulp used to make ordinary paper and the carbon nano suspension used to make carbon nanopaper, the improved vacuum rotary paper machines have the following problems:

[0040] ① The filter membrane used in the preparation of carbon nanopaper is a flexible film with a mesh size of less than 1 micron and a very dense mesh, while the forming mesh used in the rotary screen paper machine has a larger mesh;

[0041] ②Compared with pulp, the concentration of carbon nanotube suspension is lower. For low-concentration carbon nanotube dispersion, high negative pressure filtration is required. However, the mesh cage used in the improved vacuum rotary paper machine is integrated. After it is connected to the vacuum pump, negative pressure will be generated on the entire circumference of the mesh cage. However, the negative pressure is relatively small, which is not conducive to the filtration and forming of carbon nanopaper.

[0042] ③ The negative pressure on the circumferential surface of the mesh cage is roughly the same. If a filter membrane is used to replace the forming mesh, the carbon nanotubes gradually deposited on the surface of the filter membrane during continuous filtration will block the mesh of the filter membrane, causing the filtration resistance to gradually increase, thereby gradually reducing the negative pressure on the surface of the filter membrane, and the retention rate of carbon nanotubes on the surface of the filter membrane begins to decrease, ultimately leading to uneven or unformed carbon nanopaper.

[0043] like Figures 1 to 8 As shown, in order to solve the problems existing in the above-mentioned related technologies, an embodiment of the present invention provides a continuous carbon nanopaper preparation device, comprising a support 2, a filter membrane 1, and an unwinding device 3 and a winding device 4 arranged on the support 2, and the continuous carbon nanopaper preparation device also includes:

[0044] The support member includes two side plates 5, and the two side plates 5 are spaced apart and arranged on the bracket 2. The two side plates 5 are respectively provided with a suction pipe, wherein the suction pipe is used to be connected to a vacuum pump.

[0045] Specifically, the support is used to support the annular multi-cavity rotating negative pressure roller 6, the negative pressure sealing fixed roller 7, and the arc-shaped liquid supply groove 8 for preparing nanotubes. The support can be a support plate, a support frame, a support rod, etc. Figure 1 As shown, in this embodiment, the support members are two side panels 5, and mounting holes are provided at corresponding positions on the side panels 5 for mounting structures such as the annular multi-cavity rotary negative pressure roller 6, the negative pressure sealing fixed roller 7, and the arc-shaped liquid supply trough 8. A suction pipe 51 is provided on each side panel 5. The two suction pipes 51 are connected to a vacuum pump after being combined to apply negative pressure to the annular multi-cavity rotary negative pressure roller 6. Alternatively, the two suction pipes 51 can be connected to the vacuum pump separately. This can be adjusted according to actual conditions and is not specifically limited here.

[0046] The annular multi-cavity rotating negative pressure roller 6 is rotatably connected between the two side plates 5, and a plurality of negative pressure cavities 61 arranged annularly with the axis of the annular multi-cavity rotating negative pressure roller 6 as the center are provided in the annular multi-cavity rotating negative pressure roller 6. A plurality of radial micropores 62 are provided between the outer circumferential surface of the annular multi-cavity rotating negative pressure roller 6 and the negative pressure cavity 61, and the end face of the annular multi-cavity rotating negative pressure roller 6 is provided with through holes 63 with the same number as the negative pressure cavity 61, and each through hole 63 is respectively connected to the corresponding negative pressure cavity 61.

[0047] Specifically, if Figure 3 and Figure 4 As shown, Figure 4 Figure a in the middle shows a schematic diagram of the end surface structure of the annular multi-cavity rotary negative pressure roller 6. Figure 4 Figure b in the middle shows a schematic cross-sectional view of the annular multi-cavity rotary negative pressure roller 6. The annular multi-cavity rotary negative pressure roller 6 is hollow and cylindrical and is disposed between two side plates 5. For example, each side plate 5 includes a shaft fixing hole, through which the central shaft 64 of the annular multi-cavity rotary negative pressure roller 6 is fixed to the side plates 5. The annular multi-cavity rotary negative pressure roller 6 is provided with a plurality of negative pressure chambers 61 arranged circumferentially around the axis of the annular multi-cavity rotary negative pressure roller 6. Each negative pressure chamber 61 is independently configured and connected to the outer circumferential surface of the annular multi-cavity rotary negative pressure roller 6, with the end surface having the same shape as the annular multi-cavity rotary negative pressure roller 6, but with a smaller diameter than the annular multi-cavity rotary negative pressure roller 6. Multiple radial micropores 62 extend between the outer circumferential surface of each negative pressure chamber 61 and the outer circumferential surface of the annular multi-cavity rotary negative pressure roller 6, connecting each negative pressure chamber 61 to the outside world through the radial micropores 62. On the end surface of the annular multi-cavity rotating negative pressure roller 6 , a through hole 63 communicating with the negative pressure cavity 61 is opened at a position corresponding to each negative pressure cavity 61 , so as to facilitate the subsequent negative pressure vacuuming of the negative pressure cavity 61 .

[0048] Negative pressure sealing fixed roller 7, two of the negative pressure sealing fixed rollers 7 are symmetrically arranged on the two side plates 5, and the two negative pressure sealing fixed rollers 7 are respectively in contact with the two ends of the annular multi-cavity rotating negative pressure roller 6, and an arc-shaped negative pressure groove 71 is provided inside the negative pressure sealing fixed roller 7, and the end face of the negative pressure sealing fixed roller 7 facing away from the annular multi-cavity rotating negative pressure roller 6 is provided with a first suction hole 72 connected to the arc-shaped negative pressure groove 71, and the two first suction holes 72 are respectively arranged corresponding to the two suction tubes, and the end face of the negative pressure sealing fixed roller 7 facing the annular multi-cavity rotating negative pressure roller 6 is provided with a plurality of second suction holes 73 distributed along the same arc line, and the diameters of the plurality of second suction holes 73 gradually change along the circumference of the annular multi-cavity rotating negative pressure roller 6, and the plurality of second suction holes 73 are respectively connected to the arc-shaped negative pressure groove 71.

[0049] Specifically, if Figure 5 and Figure 6 As shown, Figure 5 Figure a in the middle shows a schematic structural diagram of the end surface of the negative pressure sealing fixed roller 7 facing the annular multi-cavity rotating negative pressure roller 6. Figure 5 Figure b in the middle shows a schematic structural diagram of the end face of the negative pressure sealing fixed roller 7 facing away from the annular multi-cavity rotating negative pressure roller 6. There are two negative pressure sealing fixed rollers 7, which are respectively arranged on the two end faces of the annular multi-cavity rotating negative pressure roller 6. The diameter of the negative pressure sealing fixed roller 7 is equal to the diameter of , and a rotating shaft through hole is provided at the position of the negative pressure sealing fixed roller 7 corresponding to the rotating shaft 64 of the annular multi-cavity rotating negative pressure roller 6. The rotating shaft 64 passes through the rotating shaft through hole and is fixed on the side plate 5 through the rotating shaft fixing hole. At this time, the end face of the negative pressure sealing fixed roller 7 facing away from the annular multi-cavity rotating negative pressure roller 6 abuts against the end face of the side plate facing the negative pressure sealing fixed roller 7, and the end face of the negative pressure sealing fixed roller 7 facing the annular multi-cavity rotating negative pressure roller 6 is in mirror-smooth contact with the end face of the annular multi-cavity rotating negative pressure roller 6, that is, when the annular multi-cavity rotating negative pressure roller 6 rotates, the negative pressure sealing fixed roller 7 does not rotate with it. As shown Figure 6As shown, an arc-shaped negative pressure groove 71 is provided inside the negative pressure sealing fixed roller 7, and a first suction hole 72 connected to the arc-shaped negative pressure groove 71 is provided on the end face of the negative pressure sealing fixed roller 7 facing away from the annular multi-cavity rotating negative pressure roller 6. The two first suction holes 72 are respectively arranged corresponding to the two suction tubes. When in use, the first suction hole 72 can be connected to the through hole 63 on the annular multi-cavity rotating negative pressure roller 6 through the arc-shaped negative pressure groove 71. After the first suction hole 72 is connected to the suction tube, the vacuum pump is started to perform negative pressure vacuum on the negative pressure chamber 61 through the arc-shaped negative pressure groove 71 and the through hole 63. The negative pressure sealing fixed roller 7 is provided with a plurality of second suction holes 73 distributed along the same arc line on the end face facing the annular multi-cavity rotating negative pressure roller 6. The plurality of second suction holes 73 are respectively connected to the arc-shaped negative pressure groove 71, and the diameters of the plurality of second suction holes 73 gradually increase from small to large along the rotation direction of the annular multi-cavity rotating negative pressure roller 6. When in use, as the filter membrane 1 rotates in the annular multi-cavity rotating negative pressure roller 6, the negative pressure is increased by gradually increasing the diameter of the second suction holes 73 to ensure that the negative pressure on the annular multi-cavity rotating negative pressure roller 6 is the same, so that the carbon nanotubes are deposited on the surface of the filter membrane as evenly as possible.

[0050] The arc-shaped liquid supply groove 8 has two ends connected to the two side plates 5 respectively. The arc-shaped liquid supply groove 8 is used to hold the carbon nanotube suspension. The arc-shaped liquid supply groove 8 is sleeved outside the annular multi-cavity rotating negative pressure roller 6.

[0051] Specifically, the arcuate liquid supply trough 8 is used to supply the carbon nanotube suspension required for carbon nanopaper preparation to the annular multi-cavity rotary negative pressure roller 6. Specifically, the shape of the arcuate liquid supply trough 8 matches the annular multi-cavity rotary negative pressure roller 6, and the radius of the arcuate liquid supply trough 8 is slightly larger than the radius of the annular multi-cavity rotary negative pressure roller 6. The arcuate liquid supply trough 8 can be mounted on the annular multi-cavity rotary negative pressure roller 6 with a certain gap between the two. The carbon nanotube suspension can be injected into the gap between the arcuate liquid supply trough 8 and the annular multi-cavity rotary negative pressure roller 6. When the annular multi-cavity rotary negative pressure roller 6 rotates, the carbon nanotubes in the carbon nanotube suspension are adsorbed on the filter membrane 1 to prepare the carbon nanopaper. The length of the arcuate liquid supply trough 8 is equal to the total length of the annular multi-cavity rotary negative pressure roller 6 and the two negative pressure sealing fixed rollers 7. At the same time, to ensure the stability of the arcuate liquid supply trough 8, the arcuate liquid supply trough 8 is provided with connection holes at both ends, through which it is fixedly connected to the side plate 5.

[0052] The filter membrane 1 is used to be drawn out from the unwinding device 3 and wrapped around the circumferential multi-cavity rotary negative pressure roller 6 . The filter membrane 1 drawn out from the unwinding device 3 is connected to the winding device 4 .

[0053] Specifically, unwinding device 3 is used to rewind the filter membrane before treatment, and rewinding device 4 is used to rewind the filter membrane after carbon nanopaper is prepared. During use, the untreated filter membrane 1 is withdrawn from unwinding device 3, wrapped around the annular multi-cavity rotary negative pressure roller 6, and then connected to rewinding device 4 for rewinding.

[0054] During use, the untreated filter membrane 1 is first withdrawn from the unwinding device 3, wrapped around the annular multi-cavity rotary negative pressure roller 6, and then connected to the reeling device 4 for reeling, thereby tautly tightening the filter membrane 1. The dispersed carbon nanotube suspension is continuously injected into the arc-shaped negative pressure tank 8, where the carbon nanotube suspension contacts the filter membrane. The suction pipe on the side plate 5 is connected to the first suction hole 72 on the negative pressure sealing fixed roller 7, and the vacuum pump connected to the suction pipe is started. The air in the multiple negative pressure chambers 61 arranged in an annular manner on the annular multi-cavity rotating negative pressure roller 6 is extracted through the corresponding first suction hole 72, the arc-shaped negative pressure groove 71, the second suction hole 73 and the through hole 63 on the annular multi-cavity rotating negative pressure roller 6 to form a high negative pressure state in the negative pressure chamber 61. The high negative pressure negative pressure chamber 61 adsorbs the filter membrane 1 onto the annular multi-cavity rotating negative pressure roller 6 through the radial micropores 62 opened on the outer circumferential surface of the annular multi-cavity rotating negative pressure roller 6. The water in the carbon nanotube suspension is sucked into the negative pressure chamber 61 through the mesh of the filter membrane 1 and the radial micropores 62 of the annular multi-cavity rotating negative pressure roller 6, and is then sucked away by the vacuum pump through the through hole 63, the second suction hole 73, the arc-shaped negative pressure groove 71 and the first suction hole 72. At the same time, the carbon nanotubes in the carbon nanotube suspension are adsorbed onto the filter membrane 1 to form carbon nanopaper.Since the filtration pressure applied by the vacuum pump is always constant, when the filter membrane 1 just contacts the carbon nanotube suspension, the surface of the filter membrane 1 contains only a small amount or no carbon nanotubes, the filtration resistance is small, the negative pressure on the surface of the filter membrane 1 is large, and the adsorption force on the carbon nanotubes is also large. As the time that the filter membrane 1 enters the carbon nanotube suspension gradually increases, the carbon nanotubes deposited on the surface of the filter membrane 1 gradually increase, the filtration resistance increases, the negative pressure on the surface of the filter membrane 1 begins to decrease, the adsorption force on the carbon nanotubes also gradually decreases, and the retention rate of the carbon nanotubes on the surface of the filter membrane 1 begins to decrease, which is not conducive to the formation of carbon nanopaper. Therefore, the two symmetrically arranged negative pressure sealing fixed rollers 7 are provided with second filtration holes 73 on the end face of the annular multi-cavity rotating negative pressure roller 6, and the diameter increases from small to large along the rotation direction of the annular multi-cavity rotating negative pressure roller 6, thereby ensuring that the filtration resistance remains approximately unchanged during the entire filtration process, and the negative pressure on the surface of the filter membrane 1 is approximately the same, so that as many carbon nanotubes as possible and evenly deposited on the surface of the filter membrane 1, finally forming carbon nanopaper, for example When the filter membrane 1 just contacts the carbon nanotube suspension, the corresponding second suction filtration hole 73 is the smallest. At this time, the negative pressure caused by the suction tube 51 to the negative pressure cavity 61 at the corresponding position through the second suction filtration hole 73 is the smallest. Before the filter membrane 1 rotates out of the carbon nanotube suspension, the corresponding second suction filtration hole 73 is the largest. At this time, the negative pressure caused by the suction tube 51 to the negative pressure cavity 61 at the corresponding position through the second suction filtration hole 73 is the largest. Moreover, since the second suction filtration hole 73 rotates with the rotation direction of the annular multi-cavity rotating negative pressure roller 6 If the pressure gradually increases, the negative pressure of the same negative pressure chamber 61 will gradually increase during the process of the filter membrane 1 entering and leaving the carbon nanotube suspension, and the number of carbon nanotubes deposited on the surface of the negative pressure chamber 61 will gradually increase, affecting the negative pressure chamber 61's further adsorption of carbon nanotubes. In summary, during the process of the filter membrane 1 entering and leaving the carbon nanotube suspension, the adsorption force of the carbon nanotubes in the carbon nanotube suspension by the same negative pressure chamber 61 is as similar as possible. At the same time, the annular multi-cavity rotating negative pressure roller 6 rotates to drive the filter membrane 1 to rotate, and the winding device 4 rotates to wind the membrane, thereby realizing the continuous preparation and collection of carbon nanopaper. During operation, the performance of the prepared carbon nanopaper can be controlled by adjusting the rotation speed of the annular multi-cavity rotating negative pressure roller 6.

[0055] Optionally, the plurality of second filtration holes 73 are respectively tangent to the bottom arc line of the arc-shaped negative pressure groove 71 .

[0056] Specifically, refer to Figure 5 Middle Figure a and Figure 6 As shown, the plurality of second filtration holes 73 are respectively tangent to the arc line a at the bottom of the arc-shaped negative pressure groove 71 to ensure the filtration efficiency.

[0057] In another embodiment of the present invention, the arc line connecting the centers of the plurality of second filtration holes 73 is parallel to the center line of the arc-shaped negative pressure groove 71 , thereby improving the filtration efficiency.

[0058] Optionally, the multiple negative pressure chambers 61 are evenly distributed along the same circumference inside the circumferential multi-cavity rotating negative pressure roller 6, and the multiple through holes 63 are respectively tangent to the arc lines of the circumferential walls of the multiple negative pressure chambers 61, and the bottom arc line of the arc-shaped negative pressure groove 71 corresponds to the circumferential wall.

[0059] Specifically, if Figure 4 and Figure 6 As shown, multiple negative pressure chambers 61 are evenly distributed along the same circumference inside the annular multi-cavity rotating negative pressure roller 6, and each through hole 63 is tangent to the arc of the corresponding negative pressure chamber circumferential wall, and the projected bottom arc of the arc-shaped negative pressure groove 71 on the end face of the annular multi-cavity rotating negative pressure roller 6 corresponds to the circumferential wall of the negative pressure chamber 61, so as to ensure that the first filtration hole 72 and the second filtration hole 73 can accurately correspond to the through hole 63, ensuring that each negative pressure chamber 61 is filtered and the filtration effect is the same, thereby improving the preparation efficiency of carbon nanopaper.

[0060] Optionally, at least one fixing hole 74 is formed on the end surface of the negative pressure sealing fixed roller 7 away from the annular multi-cavity rotating negative pressure roller 6. The negative pressure sealing fixed roller 7 is connected to the side plate 5 through the fixing hole 74 to ensure the stability of the negative pressure sealing fixed roller 7 during operation. It should be noted that in this embodiment, three fixing holes 74 are formed. The specific number of fixing holes 74 can be adjusted according to actual conditions and is not specifically limited here.

[0061] Optionally, the arc-shaped liquid supply trough 8 is a semi-cylindrical structure, and a feed pipe 9 and an overflow pipe 10 are provided on the semi-cylindrical structure.

[0062] Specifically, if Figure 7 and Figure 8 As shown, the arc-shaped liquid supply tank 8 is configured as a semi-cylindrical structure, and the annular multi-cavity rotary negative pressure roller 6 can be nested in the arc-shaped liquid supply tank 8. The carbon nanotube suspension is injected into the gap between the annular multi-cavity rotary negative pressure roller 6 and the arc-shaped liquid supply tank 8. The arc-shaped liquid supply tank 8 is provided with a feed pipe 9 and an overflow pipe 10 at the center of the two arc-shaped edges. When the device is in operation, the feed pipe 9 continuously transports the carbon nanotube suspension. When the liquid level of the carbon nanotube suspension reaches the edge of the arc-shaped liquid supply tank 8, it will flow out of the overflow pipe 10, thereby keeping the liquid level at the edge of the arc-shaped liquid supply tank 8, avoiding spillage of the carbon nanotube suspension and waste of resources.

[0063] Optionally, a residual liquid discharge pipe 11 is further provided on the semi-cylinder structure.

[0064] Specifically, if Figure 7 and Figure 8 As shown, a residual liquid discharge pipe 11 is provided at the bottom center of the semi-cylindrical structure. After the operation is completed, the residual liquid discharge pipe 11 at the bottom of the arc-shaped liquid supply tank 8 is opened to discharge the residual carbon nanotube suspension.

[0065] Alternatively, as Figure 4 As shown, the through hole 63 includes a circular hole 631 and a triangular hole 632. During operation, under the action of the suction tube, the negative pressure chamber 61 is negatively pressurized through the circular hole 631, and most of the water in the negative pressure chamber 61 is extracted. At the same time, the annular multi-cavity rotating negative pressure roller 6 is continuously rotating. Affected by centrifugal force, water may remain on the end face of the negative pressure chamber 61 away from the central axis of the annular multi-cavity rotating negative pressure roller 6. Therefore, a triangular hole 632 is opened in the negative pressure chamber 61 at a position away from the central axis of the annular multi-cavity rotating negative pressure roller 6 to ensure that all the water in the negative pressure chamber 61 is extracted, thereby increasing the filtration efficiency.

[0066] Optionally, a vibrator 12 is provided at the bottom of the arc-shaped liquid supply tank 8 .

[0067] Specifically, if Figure 1 As shown, the vibrator 12 is disposed at the bottom of the arc-shaped liquid supply tank 8. When in use, the vibrator 12 is used to vibrate the arc-shaped liquid supply tank 8 to evenly distribute the carbon nanotubes within the arc-shaped liquid supply tank 8, thereby ensuring the uniformity of the carbon nanotube suspension in the arc-shaped liquid supply tank 8 and preventing the carbon nanotubes from agglomerating and depositing at the bottom of the arc-shaped liquid supply tank. It should be noted that the number of vibrators 12 can be adjusted according to actual needs.

[0068] Optionally, the continuous carbon nanopaper preparation device further includes a drying lamp 13 , which is disposed on the bracket 2 and between the winding device 4 and the circumferential multi-cavity rotary negative pressure roller 6 .

[0069] Specifically, if Figure 1 As shown, the drying lamp 13 is arranged on the bracket, and the drying lamp 13 is arranged between the winding device 4 and the circumferential multi-cavity rotating negative pressure roller 6, and its light direction is toward the filter membrane 1 to dry the carbon nanopaper prepared on the filter membrane 1. It should be noted that the number of drying lamps 13 can be adjusted according to actual needs, such as Figure 1 In the embodiment, two drying lamps 13 are provided, which are respectively provided above and below the filter membrane 1 to dry the carbon nanopaper prepared on the filter membrane 1 from both upper and lower directions, thereby increasing the drying efficiency.

[0070] Optionally, the continuous carbon nanopaper preparation device further includes a deviation corrector 14 , which is disposed on the bracket 2 and is used to be connected to the filter membrane 1 .

[0071] Specifically, if Figure 1As shown, the deviation corrector 14 is arranged on the bracket, and the deviation corrector 14 is usually arranged between the unwinding device 3 and the annular multi-cavity rotary negative pressure roller 6 and between the winding device 4 and the annular multi-cavity rotary negative pressure roller 6 to correct the winding position of the filter membrane 1 and ensure the position of the filter membrane 1. It should be noted that the number of the deviation correctors 14 can be adjusted according to actual needs, such as Figure 1 In the figure, two deviation correctors 14 are provided, which are respectively provided between the unwinding device 3 and the annular multi-cavity rotary negative pressure roller 6 and between the winding device 4 and the annular multi-cavity rotary negative pressure roller 6, to correct the position of the filter membrane 1 before it enters the annular multi-cavity rotary negative pressure roller 6 and the position of the filter membrane 1 before it is wound onto the winding device 4, so as to ensure the flatness of the filter membrane.

[0072] Although the present invention is disclosed as above, the protection scope of the present invention is not limited thereto. Those skilled in the art may make various changes and modifications without departing from the spirit and scope of the present invention, and these changes and modifications will fall within the protection scope of the present invention.

Claims

1. A continuous carbon nanopaper preparation device, comprising a support (2), a filter membrane (1), and an unwinding device (3) and a winding device (4) arranged on the support (2), characterized in that: Also includes: A support member, the support member comprising two side plates (5), the two side plates (5) being arranged on the bracket (2) at intervals, and a suction filter tube (51) being respectively arranged on the two side plates (5); An annular multi-cavity rotating negative pressure roller (6), the annular multi-cavity rotating negative pressure roller (6) is rotatably connected between the two side plates (5), a plurality of annularly arranged negative pressure cavities (61) are provided in the annular multi-cavity rotating negative pressure roller (6), a plurality of radial micropores (62) are provided between the outer circumferential surface of the annular multi-cavity rotating negative pressure roller (6) and the negative pressure cavities (61), a plurality of through holes (63) are opened on the end surface of the annular multi-cavity rotating negative pressure roller (6), and each through hole (63) is communicated with the corresponding negative pressure cavity (61); A negative pressure sealing fixed roller (7), two of the negative pressure sealing fixed rollers (7) are symmetrically arranged on the two side plates (5), and the two negative pressure sealing fixed rollers (7) are respectively in contact with the two ends of the annular multi-cavity rotating negative pressure roller (6), an arc-shaped negative pressure groove (71) is provided inside the negative pressure sealing fixed roller (7), and the end surface of the negative pressure sealing fixed roller (7) facing away from the annular multi-cavity rotating negative pressure roller (6) is provided with a first suction filter connected to the arc-shaped negative pressure groove (71) Hole (72), two of the first suction holes (72) are respectively arranged corresponding to the two suction tubes (51), the end surface of the negative pressure sealing fixed roller (7) facing the annular multi-cavity rotating negative pressure roller (6) is provided with a plurality of second suction holes (73) distributed along the same arc, and the diameters of the plurality of second suction holes (73) gradually change along the circumference of the annular multi-cavity rotating negative pressure roller (6), and the plurality of second suction holes (73) are respectively connected to the arc-shaped negative pressure groove (71); An arc-shaped liquid supply trough (8), the two ends of which are respectively connected to the two side plates (5), the arc-shaped liquid supply trough (8) is used to hold a carbon nanotube suspension, and the arc-shaped liquid supply trough (8) is sleeved outside the annular multi-cavity rotating negative pressure roller (6); The filter membrane (1) is used to be drawn out from the unwinding device (3), wrap around the circumferential multi-cavity rotary negative pressure roller (6), and be connected to the winding device (4).

2. The continuous carbon nanopaper preparation device according to claim 1, characterized in that: The plurality of second suction holes (73) are respectively tangent to the bottom arc line of the arc-shaped negative pressure groove (71).

3. The continuous carbon nanopaper preparation device according to claim 1, characterized in that: The plurality of negative pressure chambers (61) are evenly distributed along the same circumference inside the circumferential multi-cavity rotating negative pressure roller (6), and the plurality of through holes (63) are respectively tangent to the arc lines of the circumferential walls of the plurality of negative pressure chambers (61), and the bottom arc line of the arc-shaped negative pressure groove (71) corresponds to the circumferential wall.

4. The continuous carbon nanopaper preparation device according to claim 1, characterized in that: At least one fixing hole (74) is provided on the end surface of the negative pressure sealing fixed roller (7) away from the annular multi-cavity rotating negative pressure roller (6), and the negative pressure sealing fixed roller (7) is connected to the side plate (5) through the fixing hole (74).

5. The continuous carbon nanopaper preparation device according to claim 1, characterized in that: The arc-shaped liquid supply trough (8) is a semi-cylindrical structure, and a feed pipe (9) and an overflow pipe (10) are provided on the semi-cylindrical structure.

6. The continuous carbon nanopaper preparation device according to claim 5, characterized in that: The semi-cylinder structure is also provided with a residual liquid discharge pipe (11).

7. The continuous carbon nanopaper preparation device according to claim 1, characterized in that: The through hole (63) includes a circular hole (631) and a triangular hole (632).

8. The continuous carbon nanopaper preparation device according to claim 1, characterized in that: A vibrator (12) is provided at the bottom of the arc-shaped liquid supply trough (8).

9. The continuous carbon nanopaper preparation device according to claim 1, characterized in that: It also includes a drying lamp (13), which is arranged on the bracket (2), and the drying lamp (13) is arranged between the winding device (4) and the circumferential multi-cavity rotary negative pressure roller (6).

10. The continuous carbon nanopaper preparation device according to claim 1, characterized in that: It also includes a deviation corrector (14), which is arranged on the bracket (2) and is used to be connected to the filter membrane (1).

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