Continuous carbon nano paper preparation equipment

Abstract

The invention relates to the technical field of carbon nano paper preparation, and provides continuous carbon nano paper preparation equipment which comprises a support, a filter membrane, an unwinding device and a winding device and further comprises a supporting piece, the supporting piece comprises two side plates, the two side plates are each provided with a suction filtration pipe, and the suction filtration pipes are used for being connected with a vacuum pump; a negative pressure cavity is formed in the annular multi-cavity rotary negative pressure roller, a radial micropore is formed between the outer circumferential surface and the negative pressure cavity, and a through hole is formed in the end surface and is communicated with the corresponding negative pressure cavity; the two negative-pressure sealing fixed rollers are in contact with the two ends of the annular multi-cavity rotating negative-pressure roller, arc-shaped negative-pressure grooves are formed in the negative-pressure sealing fixed rollers, first suction filtration holes and second suction filtration holes which are communicated with the arc-shaped negative-pressure grooves are formed in the two end faces of the negative-pressure sealing fixed rollers, and the diameters of the second suction filtration holes are gradually increased in the rotating direction of the annular multi-cavity rotating negative-pressure roller; and the arc-shaped liquid supply groove is arranged on the annular multi-cavity rotary negative pressure roller in a sleeving manner. The continuous preparation of the carbon nano paper can be realized, so that the preparation efficiency of the carbon nano paper is effectively improved.

Description

Technical Field

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

[0002] At present, carbon nanopaper is usually prepared by suspension filtration method. The process of preparing carbon nanopaper by suspension filtration method mainly includes three steps: preparing uniformly dispersed carbon nanotube suspension, negative pressure filtration and drying. The operation and process of suspension filtration method are relatively simple, and when the carbon nanotube suspension is uniformly dispersed, the performance uniformity of the prepared carbon nanopaper is better. However, this method is mostly used for small-scale preparation of carbon nanopaper in the laboratory. There is a lack of relevant equipment for continuous preparation of carbon nanopaper, resulting in low efficiency of carbon nanopaper preparation. 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] In order 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 arranged on the support, and also comprising:

[0005] A support member, the support member comprises two side plates, the two side plates are arranged on the bracket at intervals, and the two side plates are 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 cavities are arranged inside the annular multi-cavity rotating negative pressure roller, a plurality of penetrating radial micro-holes are arranged between the outer circumferential surface of the annular multi-cavity rotating negative pressure roller and the negative pressure cavities, 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 cavity;

[0007] A negative pressure sealing fixed roller, wherein two of the 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 an 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 hole connected with the arc-shaped negative pressure groove, and the two first suction 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 holes distributed along the same arc line, and the diameters of the plurality of second suction holes gradually change along the circumference of the annular multi-cavity rotating negative pressure roller, and the plurality of second suction holes are respectively connected with the arc-shaped negative pressure groove;

[0008] An arc-shaped liquid supply groove, wherein both ends of the arc-shaped liquid supply groove are respectively connected to the two side plates, the arc-shaped liquid supply groove is used to contain the carbon nanotube suspension, and the arc-shaped liquid supply groove 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 rotating negative pressure roller, and is 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 where the circumferential walls of the multiple negative pressure chambers are located, 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 also 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 tank.

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

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

[0019] The beneficial effect of the continuous carbon nanopaper preparation device of the present invention is that when in use, the untreated filter membrane is firstly drawn out from the unwinding device, wrapped with the annular multi-cavity rotating negative pressure roller, and then connected to the winding device for winding, so that the filter membrane reaches a tight state. The arc-shaped liquid supply tank continuously injects the dispersed carbon nanotube suspension, and at this time, the carbon nanotube suspension contacts the filter membrane. The suction filter tube on the side plate is connected to the first suction filter hole on the negative pressure sealing fixed roller, and the vacuum pump connected to the suction filter tube is started, and the air in the negative pressure chamber at the corresponding position of the annular multi-cavity rotating negative pressure roller is extracted through the correspondingly connected first suction filter hole, the arc-shaped negative pressure groove, the second suction filter 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 chamber, and the high negative pressure negative pressure chamber 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 chamber through the mesh 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 filter tube through the through hole, the second suction filter hole, the arc-shaped negative pressure groove and the first suction filter 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 for the filter membrane to enter 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 second filtration holes set on the end face of the annular multi-cavity rotating negative pressure roller are symmetrically arranged with two negative pressure sealing fixed rollers, and the diameter changes from small to large along the rotation direction of the annular multi-cavity rotating negative pressure roller, thereby ensuring that the filtration resistance remains approximately unchanged and the negative pressure on the filter membrane surface is approximately the same during the entire filtration process, so that as many carbon nanotubes as possible and evenly deposited on the filter membrane surface, finally forming 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 filtration tube to the negative pressure chamber at the corresponding position through the second suction filtration hole is the smallest, and 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 filtration tube to the negative pressure chamber at the corresponding position through the second suction filtration hole is the largest, and because the second suction filtration hole gradually increases with the rotation direction of the annular multi-cavity rotating negative pressure roller, the negative pressure of the same negative pressure chamber gradually increases during 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 negative pressure chamber's further adsorption of the carbon nanotubes. On the whole, during 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 rotating negative pressure roller rotates to drive the filter membrane to rotate, and the winding device rotates to collect the membrane, thereby realizing continuous preparation and collection of carbon nanopaper. During operation, the performance of the prepared carbon nanopaper can be controlled by adjusting the speed of the annular multi-cavity rotating negative pressure roller. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 A schematic diagram of the structure 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 It is a structural schematic diagram of an annular multi-cavity rotating negative pressure roller according to an embodiment of the present invention;

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

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

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

[0026] Figure 7 It is a 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 It 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-support; 3-unwinding device; 4-winding device; 5-side plate; 51-filter tube;

[0030] 6-circumferential multi-cavity rotating negative pressure roller; 61-negative pressure cavity; 62-radial microholes; 63-through holes; 631-circular holes; 632-triangular holes; 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-fixed 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] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below in conjunction with 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 interpreted as being limited to the embodiments described herein. On the contrary, 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 only for exemplary purposes 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 "plurality" mentioned in the present invention are illustrative rather than restrictive, and 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 to form a uniform carbon nanotube network structure. As a macroscopic material of carbon nanotubes, carbon nanopaper has the advantages of light weight, high strength, corrosion resistance, high thermal conductivity and high electrical conductivity. It can be widely used in lightning protection, anti-icing, electromagnetic shielding, sensors, lithium-ion battery electrodes, supercapacitor electrodes and fiber-reinforced composite materials.

[0037] The method for preparing carbon nanopaper includes chemical vapor deposition method and suspension filtration method.

[0038] The principle of preparing carbon nanopaper by chemical vapor deposition is to use small molecule hydrocarbons as raw materials. Under the action of catalysts, carbon nanotubes are first formed through high temperature reaction. Then, the carbon nanotubes are taken out of the reactor with the carrier gas, and continuously deposited on the receiving plate, and carbon nanopaper is formed under the action of gas pressure. At present, the chemical vapor deposition method can be used to continuously prepare carbon nanopaper, but its preparation process is complicated and the operation process is difficult to control. Therefore, the prepared carbon nanopaper has uneven components and contains a high content of residual catalyst.

[0039] The more commonly used method is the suspension filtration method. The equipment for preparing carbon nanopaper is similar to that for preparing ordinary paper. Therefore, in order to save production costs, improvements will be made to the original equipment for preparing ordinary paper, such as the vacuum cylinder paper machine. However, when faced with the pulp used to make ordinary paper and the carbon nano suspension used to make carbon nanopaper, due to the obvious differences in their properties and concentrations, the improved vacuum cylinder paper machine has 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 very dense meshes, while the forming mesh used in the rotary screen paper machine has larger meshes;

[0041] ②Compared with pulp, the concentration of carbon nanotube suspension is lower. For low-concentration carbon nanotube dispersion, high negative pressure filtration is required. The mesh cage used in the improved vacuum rotary paper machine is integrated. After connecting the vacuum pump, negative pressure will be generated on the entire circumference of the mesh cage, but 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 holes 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 view of 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, the two side plates 5 are spaced apart on the bracket 2, and the two side plates 5 are respectively provided with suction pipes, wherein the suction pipes are used to be connected to a vacuum pump.

[0045] Specifically, the support member 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 member can be a support plate, a support frame, a support rod, etc. Figure 1 As shown, in this embodiment, the support member is two side plates 5, and mounting holes are provided at corresponding positions on the side plates 5 to install structures such as the annular multi-cavity rotating negative pressure roller 6, the negative pressure sealing fixed roller 7, and the arc-shaped liquid supply groove 8. A suction filter pipe 51 is respectively provided on the two side plates 5. The two suction filter pipes 51 are connected to the vacuum pump after being combined to perform negative pressure vacuum on the annular multi-cavity rotating negative pressure roller 6. In addition, the two suction filter pipes 51 can also be connected to the vacuum pump respectively, which can be adjusted according to actual conditions and is not specifically limited here.

[0046] An 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 are arranged annularly with the axis of the annular multi-cavity rotating negative pressure roller 6 as the center. 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 surface of the annular multi-cavity rotating negative pressure roller 6 is provided with through holes 63 having 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, 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 rotating negative pressure roller 6. Figure 4 Figure b in the middle shows a schematic diagram of the cross-sectional structure of the annular multi-cavity rotating negative pressure roller 6. The annular multi-cavity rotating negative pressure roller 6 is in the shape of a hollow cylinder and is arranged between two side plates 5. For example, the two side plates 5 are respectively provided with rotating shaft fixing holes, and the central rotating shaft 64 of the annular multi-cavity rotating negative pressure roller 6 is fixed on the side plates 5 through the two rotating shaft fixing holes. A plurality of negative pressure chambers 61 arranged annularly with the axis of the annular multi-cavity rotating negative pressure roller 6 as the center are arranged in the annular multi-cavity rotating negative pressure roller 6. Each negative pressure chamber 61 is independently arranged, and each negative pressure chamber 61 is connected to the outer circumferential surface away from the axis of the annular multi-cavity rotating negative pressure roller 6. The end face shape formed is the same as the shape of the annular multi-cavity rotating negative pressure roller 6, but its diameter is smaller than the diameter of the annular multi-cavity rotating negative pressure roller 6, and a plurality of radial micropores 62 are penetrated between the outer circumferential surface of each negative pressure chamber 61 and the outer circumferential surface of the annular multi-cavity rotating negative pressure roller 6, and each negative pressure chamber 61 is connected to the outside 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 vacuum of the negative pressure cavity 61 .

[0048] A negative pressure sealing fixed roller 7, wherein the two 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 arranged 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 hole 72 connected with 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 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 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 with the arc-shaped negative pressure groove 71.

[0049] Specifically, 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 is 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 the annular multi-cavity rotating negative pressure roller 6, and a rotating shaft through hole is opened 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 to 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 with 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 surface 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 change 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 contain 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 arc-shaped liquid supply groove 8 is used to provide the carbon nano suspension required for the preparation of carbon nano paper to the annular multi-cavity rotating negative pressure roller 6, that is, the shape of the arc-shaped liquid supply groove 8 matches the annular multi-cavity rotating negative pressure roller 6, the radius of the arc-shaped liquid supply groove 8 is slightly larger than the radius of the annular multi-cavity rotating negative pressure roller 6, the arc-shaped liquid supply groove 8 can be sleeved on the annular multi-cavity rotating negative pressure roller 6, and a certain gap is left between the two, and the carbon nano suspension can be injected into the gap between the arc-shaped liquid supply groove 8 and the annular multi-cavity rotating negative pressure roller 6, so that when the annular multi-cavity rotating negative pressure roller 6 rotates, the carbon nanotubes in the carbon nano suspension are adsorbed on the filter membrane 1 to prepare carbon nano paper. The length of the arc-shaped liquid supply groove 8 is equal to the total length of the annular multi-cavity rotating negative pressure roller 6 and the two negative pressure sealing fixed rollers 7. At the same time, in order to ensure the stability of the arc-shaped liquid supply groove 8, the two ends of the arc-shaped liquid supply groove 8 are provided with connection holes, which are fixedly connected to the side plate 5 through the connection holes.

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

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

[0054] When the present embodiment is used, the untreated filter membrane 1 is firstly drawn out from the unwinding device 3, wrapped with the annular multi-cavity rotating negative pressure roller 6, and then connected to the winding device 4 for winding, so that the filter membrane 1 reaches a tight state. The arc-shaped negative pressure groove 8 continuously injects the dispersed carbon nanotube suspension, and at this time, the carbon nanotube suspension contacts the filter membrane. The suction filter tube on the side plate 5 is connected to the first suction filter hole 72 on the negative pressure sealing fixed roller 7, and the vacuum pump connected to the suction filter tube 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 correspondingly connected first suction filter hole 72, the arc-shaped negative pressure groove 71, the second suction filter 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 then is sucked away by the vacuum pump through the through hole 63, the second suction filter hole 73, the arc-shaped negative pressure groove 71 and the first suction filter 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 second filtration holes 73 set on the end faces of the two symmetrically arranged negative pressure sealing fixed rollers 7 facing the annular multi-cavity rotating negative pressure roller 6 have a diameter that changes 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 the carbon nanotubes are deposited on the surface of the filter membrane 1 as much and as evenly as possible, and finally form 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, and at this time, the negative pressure caused by the suction filtration 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, and at this time, the negative pressure caused by the suction filtration tube 51 to the negative pressure cavity 61 at the corresponding position through the second suction filtration hole 73 is the largest. The negative pressure of the same negative pressure chamber 61 gradually increases 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 gradually increases, which affects the further adsorption of carbon nanotubes by the negative pressure chamber 61. On the whole, 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 close 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 regulated 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 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 where the circumferential walls of the multiple negative pressure chambers 61 are located, and the bottom arc line of the arc-shaped negative pressure groove 71 corresponds to the circumferential wall.

[0059] Specifically, 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, and ensure 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 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 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 provided, and the specific number of the 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, Figure 7 and Figure 8 As shown, the arc-shaped liquid supply tank 8 is set to a semi-cylindrical structure, the annular multi-cavity rotating negative pressure roller 6 can be nested in the arc-shaped liquid supply tank 8, and the carbon nanotube suspension is injected into the gap between the annular multi-cavity rotating negative pressure roller 6 and the arc-shaped liquid supply tank 8. The arc-shaped liquid supply tank 8 is respectively provided with a feed pipe 9 and an overflow pipe 10 at the center of the two arc edges. When the device is running, 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 from the overflow pipe 10, so that the liquid level is always maintained at the edge of the arc-shaped liquid supply tank 8, avoiding the spillage of the carbon nanotube suspension and causing a waste of resources.

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

[0064] Specifically, 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, if 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 to extract most of the water in the negative pressure chamber 61. At the same time, the annular multi-cavity rotating negative pressure roller 6 is continuously rotating. Under the influence of centrifugal force, water may remain on the end surface 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 suction efficiency.

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

[0067] Specifically, 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 so that the carbon nanotubes are evenly distributed in the arc-shaped liquid supply tank 8, ensuring the uniformity of the carbon nanotube suspension in the arc-shaped liquid supply tank 8, so that the carbon nanotubes do not agglomerate and deposit 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 comprises a drying lamp 13 , wherein the drying lamp 13 is disposed on the bracket 2 , and the drying lamp 13 is disposed between the winding device 4 and the circumferential multi-cavity rotating negative pressure roller 6 .

[0069] Specifically, 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 irradiation 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 arranged, respectively on the upper and lower sides of the filter membrane 1, so as to dry the carbon nanopaper prepared on the filter membrane 1 from the 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 support 2 and is used to be connected to the filter membrane 1 .

[0071] Specifically, Figure 1As shown, the deflection corrector 14 is arranged on the bracket, and the deflection corrector 14 is usually arranged between the unwinding device 3 and the annular multi-cavity rotating negative pressure roller 6 and between the rewinding device 4 and the annular multi-cavity rotating negative pressure roller 6 to correct the rewinding position of the filter membrane 1 and ensure the position of the filter membrane 1. It should be noted that the number of deflection correctors 14 can be adjusted according to actual needs, such as Figure 1 In the invention, two deviation correctors 14 are arranged, respectively arranged between the unwinding device 3 and the annular multi-cavity rotating negative pressure roller 6 and between the winding device 4 and the annular multi-cavity rotating negative pressure roller 6, to correct the position of the filter membrane 1 before it enters the annular multi-cavity rotating negative pressure roller 6 and the position of the filter membrane 1 before it is rolled up to 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 support (2) at intervals, and the two side plates (5) being respectively provided with a suction filter tube (51); 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 chambers (61) are arranged inside the annular multi-cavity rotating negative pressure roller (6), a plurality of penetrating radial micropores (62) are arranged between the outer circumferential surface of the annular multi-cavity rotating negative pressure roller (6) and the negative pressure chambers (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 of the through holes (63) is respectively connected to the corresponding negative pressure chamber (61); A negative pressure sealing fixed roller (7), wherein 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 arranged inside the negative pressure sealing fixed roller (7), and a first suction filter connected to the arc-shaped negative pressure groove (71) is opened on the end surface of the negative pressure sealing fixed roller (7) away from the annular multi-cavity rotating negative pressure roller (6) 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 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); An arc-shaped liquid supply groove (8), the two ends of which are respectively connected to the two side plates (5), the arc-shaped liquid supply groove (8) is used to contain a carbon nanotube suspension, and the arc-shaped liquid supply groove (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 annular multi-cavity rotating 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 multiple negative pressure chambers (61) are evenly distributed along the same circumference inside the annular multi-chamber rotating negative pressure roller (6), and the multiple through holes (63) are respectively tangent to the arc lines where the circumferential walls of the multiple negative pressure chambers (61) are located, 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) via 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 arranged 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 groove (8).

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

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

Images