Single-walled carbon nanotube dry conductive agent preparation equipment and preparation method
By combining a fluidized mixing unit and an elastic roller, the problem of single-walled carbon nanotube agglomeration in traditional equipment is solved, achieving uniform dispersion and efficient production while maintaining conductivity and simplifying the process.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- JIANGSU HUAYONENE TECH CO LTD
- Filing Date
- 2026-04-15
- Publication Date
- 2026-05-12
- Estimated Expiration
- Not applicable · inactive patent
AI Technical Summary
Traditional dry mixing equipment cannot effectively break up nanoscale agglomerates of single-walled carbon nanotubes, resulting in uneven mixing. Furthermore, high-energy mechanical processing can damage carbon nanotubes and reduce their electrical conductivity.
The equipment design, which combines fluidized mixing units with elastic rollers, achieves microscopic diffusion and penetration of nanoparticles through a combination of planetary fluidized mixing and three-dimensional mechanical shearing force. The elastic rollers provide shearing force to break up hard agglomerates, avoiding violent crushing.
This method achieves uniform dispersion of single-walled carbon nanotubes, maintains aspect ratio and electrical conductivity, avoids agglomeration, simplifies the process, reduces solvent costs, and increases production capacity.
Smart Images
Figure CN122006576A_ABST
Abstract
Description
Technical Field
[0001] This invention belongs to the field of lithium-ion battery technology, specifically a dry-process equipment and method for preparing single-walled carbon nanotube conductive agents. Background Technology
[0002] In electrochemical energy storage devices such as lithium-ion batteries and supercapacitors, conductive agents are crucial auxiliary materials. During the production process, traditional dry mixing equipment (such as high-speed mixers, V-type mixers, and screw extruders) mainly rely on macroscopic shearing and collision, which cannot effectively break up nanoscale agglomerates, resulting in uneven mixing and forming "pseudo-mixing". In order to pursue the dispersion effect, greater mechanical force (such as high-energy ball milling) is often required, which can easily cut or severely damage single-walled carbon nanotubes, destroy their aspect ratio, and cause a significant decrease in conductivity. Summary of the Invention
[0003] To achieve the above objectives, the present invention provides the following technical solution: a dry-process conductive agent preparation device for single-walled carbon nanotubes, comprising: a mixing tank with a feed port at its top, and multiple feeding systems disposed outside the mixing tank; a conveying pipe horizontally fixed below the mixing tank and connected to the discharge port of the mixing tank; an air inlet system disposed directly below the mixing tank, with an air inlet pipe vertically fixed on the outer wall of the conveying pipe, the other end of the air inlet pipe being connected to the air inlet system; and a fluidized mixing unit located on one side of the mixing tank, the fluidized mixing unit being connected to the conveying pipe. One end of the device is sealed and connected; a double-roll mill is located on the side of the fluidized mixing unit away from the conveying pipe, and an induced draft fan is mounted above the double-roll mill. One end of the induced draft fan is connected to the fluidized mixing unit through an air duct; an air-jet mill is located on the side of the double-roll mill away from the fluidized mixing unit, and the air-jet mill is connected to the discharge port of the double-roll mill; a collection bin is located on the side of the air-jet mill away from the double-roll mill, and a powder feeding pipe connects the collection bin and the air-jet mill.
[0004] Preferably, a premixing shaft is rotatably installed inside the mixing tank, and a discharge plate is rotatably connected inside the discharge port of the mixing tank, with the lower end of the premixing shaft connected to the discharge plate.
[0005] Preferably, the fluidized mixing unit includes: a fluidizing cylinder, coaxially disposed at one end of a conveying pipe, with an annular tube sealed and fixed to the outside of the fluidizing cylinder, and the other end of the annular tube sealed and connected to the conveying pipe; an inner ring sleeve, centrally fixed inside the annular tube, with a gear ring fixed within the inner ring sleeve; two planetary carriers symmetrically arranged and rotatably mounted in the inner ring sleeve and the fluidizing cylinder, respectively, with a sealing cover rotatably connected within the inner ring sleeve and fixed to the planetary carrier; and multiple planetary gears arranged in a circumferential array, each planetary gear rotatably connected to each of the rows. On the star frame; fluidizing rollers, each corresponding to one of the planetary gears, with both ends of each fluidizing roller fixed to the planetary gear, and a powder cavity opened inside each fluidizing roller; a sun shaft, centrally rotatably connected to each of the planetary gears, each sun shaft meshing with the planetary gear for transmission, one end of one of the sun shafts extending into and connected to a conveying pipe, a drive motor fixed outside the conveying pipe, the output end of the drive motor fixed to the sun shaft; powder guide ports, opened at the ends of the fluidizing rollers, and multiple fluidizing holes evenly opened on the outer wall of each fluidizing roller.
[0006] Preferably, an annular temperature cavity is formed in the side wall of the fluidizing cylinder, and an inlet pipe and an outlet pipe are connected to the outside of the annular temperature cavity; one end of the inlet pipe is connected to a heat medium pipe, and one end of the outlet pipe is connected to a return pipe, and the other end of the return pipe is connected to a medium tank.
[0007] Preferably, the fluidizing orifice is configured as a conical structure, and the conical tip of the fluidizing orifice is connected to the powder cavity; each powder cavity is provided with a plurality of soft ceramic grinding balls.
[0008] Preferably, a mixing sleeve is rotatably connected between two planetary carriers inside the fluidizing cylinder. The mixing sleeve has multiple guide holes, and one end of each fluidizing roller is rotatably connected to the guide holes. The mixing sleeve has a trapezoidal cross-section, and its diameter at the end closest to the inner ring is smaller than the diameter at the other end. A grinding chamber is provided at the end of the fluidizing cylinder away from the inner ring, and an inclined channel is provided on the inner wall of the fluidizing cylinder. A powder discharge hole is provided on the side wall of the fluidizing cylinder at the end of the grinding chamber, and one end of the air duct is connected to the powder discharge hole.
[0009] Preferably, a sealing disc is rotatably connected inside the grinding chamber, and multiple couplings are arranged around the circumference of the grinding chamber. One end of each coupling is connected through the sealing disc and fixed to the planetary gear on the same axis. Multiple elastic rollers corresponding to the couplings are provided inside the grinding chamber. One end of each elastic roller is fixed with a sliding shaft, and one end of the sliding shaft is slidably connected to the coupling. An inner spring is provided between the sliding shaft and the coupling. A rubber roller is rotatably arranged at the center of the grinding chamber, and one end of the rubber roller is connected to one end of another sun shaft.
[0010] Preferably, the elastic roller is composed of a plurality of air bladder sleeves arranged in a row, and the air bladder sleeves are elastically deformable and roll in contact with the rubber roller and the inner wall of the grinding chamber.
[0011] Preferably, a positioning disk is rotatably mounted at the end of the grinding chamber away from the sealing disk, and the other end of the elastic roller is slidably connected to the positioning disk through a guide shaft. A shaft tube is fixed on one side of the positioning disk, and one end of the rubber roller is rotatably connected to the shaft tube. An assembly seat is fixed at the end of the fluidizing cylinder near the positioning disk, and an end cap is fixed inside the assembly seat. A fixing tooth is rotatably connected inside the end cap, and the end of the rubber roller is fixed to the fixing tooth. A swashplate is rotatably connected to the end cap, and a transmission tooth is coaxially fixed on the swashplate. Multiple driven teeth are rotatably mounted on the inner circumference of the end cap, and the fixing tooth engages with the transmission tooth through the driven teeth. A spherical shaft is provided on the shaft tube, and a guide plate is rotatably mounted on the spherical shaft. One end of each guide shaft abuts against one end face of the guide plate, and the inclined section of the swashplate abuts against the other end face of the guide plate.
[0012] Preferably, a dry-process conductive agent preparation method using single-walled carbon nanotubes includes the following steps: Step 1: Weigh the single-walled carbon nanotube powder and the required additives according to the predetermined ratio, and then feed the raw materials into the tank from the feed port above the mixing tank through each feeding system. Use the premixing agitator to stir and mix them initially. Step 2: Activate the air intake system. Gas enters the conveying pipe through the air intake pipe, forming a horizontal airflow. Open the discharge port at the bottom of the batching tank to allow the raw materials to fall into the conveying pipe, so that the high-speed airflow can carry the raw materials into the fluidized mixing unit. In the fluidized mixing unit, the powder airflow is distributed to the powder chambers of each fluidizing roller. Driven by the motor, the sun shaft rotates, and through gear meshing, multiple planetary gears rotate on their own axis while revolving around the sun shaft. This causes the powder airflow in the powder chamber to be ejected at high speed through the fluidization holes, forming a local fluidized bed around the fluidizing rollers, promoting the microscopic diffusion and penetration of nanoparticles. Then, the powder airflow enters the grinding chamber through the inclined channel, where the elastic roller and rubber roller provide crushing and shearing force to the powder airflow, achieving dynamic grinding. Step 3: Start the induced draft fan to draw the fluidized and mixed material into the double roller mill through the air duct. The material passes through the gap between the two rollers and is ground and further mixed under high shear force. Step 4: After grinding, the material enters the airflow pulverizer through the discharge port. Inside the airflow pulverizer, the high-speed airflow causes the material particles to collide and shear with each other, achieving nanoscale dispersion and reducing residual agglomeration. Step 5: After crushing, the material is fed into the collection silo through the powder feeding pipe. The finished product is taken out from the collection silo, tested, and then sealed and packaged.
[0013] Compared with the prior art, the beneficial effects of the present invention are: The fluidized mixing unit, the main feature of this invention, organically combines high-speed airflow dispersion with three-dimensional mechanical shear force through a planetary fluidized mixing mechanism. This effectively breaks up soft agglomerates between powders and promotes the microscopic diffusion and penetration of nanoparticles. Compared with traditional mechanical mixing, this invention can effectively avoid the agglomeration of nanoparticles and achieve truly uniform dispersion. In addition, the elastic roller can effectively provide sufficient shear force to break up hard agglomerates without violently crushing the powder material, resulting in a finer and more uniform dispersion effect. Attached Figure Description
[0014] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the heat transfer medium pipe in this invention; Figure 3 This is a schematic diagram of the structure of the fluidized mixing unit in this invention; Figure 4 This is a cross-sectional view of the internal structure of the fluidized mixing unit in this invention; Figure 5 This is a schematic diagram of the internal structure of the grinding chamber in this invention; Figure 6 This is a schematic diagram of the cross-sectional structure of the elastic roller in this invention; In the diagram: 1. Batching tank; 11. Conveying pipe; 12. Air intake system; 13. Air intake pipe; 14. Double roller mill; 15. Exhaust fan; 16. Air duct; 17. Airflow pulverizer; 18. Collection bin; 19. Powder feeding pipe; 2. Fluidized mixing unit; 21. Fluidizing cylinder; 22. Ring pipe; 23. Inner ring sleeve; 24. Gear ring; 25. Planetary carrier; 26. Sealing cover; 27. Planetary gears; 28. Sun shaft; 29. Drive motor; 3. Fluidizing roller; 31. 32. Powder guide port; 33. Fluidization hole; 4. Soft ceramic grinding ball; 5. Liquid inlet pipe; 6. Liquid outlet pipe; 7. Heat medium pipe; 8. Return pipe; 9. Mixing sleeve; 10. Grinding chamber; 11. Inclined channel; 12. Powder discharge hole; 13. Sealing plate; 14. Coupling; 15. Elastic roller; 16. Rubber roller; 17. Guide shaft; 18. Positioning plate; 19. Shaft tube; 20. Assembly base; 19. End cap; 20. Fixed tooth; 21. Inclined plate; 22. Driven tooth; 33. Guide plate. Detailed Implementation
[0015] Please see Figures 1-6In this embodiment of the invention, a dry-process conductive agent preparation device for single-walled carbon nanotubes includes: a mixing tank 1 with a feed port at its top, and multiple feeding systems disposed outside the mixing tank 1; a conveying pipe 11, horizontally fixed below the mixing tank 1 and connected to the discharge port of the mixing tank 1; and an air inlet system 12 disposed directly below the mixing tank 1, with an air inlet pipe 13 vertically fixed on the outer wall of the conveying pipe 11, the other end of the air inlet pipe 13 being connected to the air inlet system 12, the air inlet system 12 being used to convey inert gases such as nitrogen. The mixture is supplied with gas or dry air; a fluidized mixing unit 2, located on one side of the mixing tank 1, is sealed and connected to one end of the conveying pipe 11. The fluidized mixing unit 2 is mainly used for fluidized dispersion mixing of air-flow powder, thereby breaking up the agglomerates of carbon nanotubes and forming a semi-dispersed material with good flowability; a double roller mill 14 is located on the side of the fluidized mixing unit 2 away from the conveying pipe 11. An induced draft fan 15 is mounted above the double roller mill 14, and one end of the induced draft fan 15 is connected to the fluidized mixing unit 1 through an air duct 16. The mixing unit 2 is connected, allowing the airflow powder to pass through the gap between the two rollers and be milled under high shear force, achieving further mixing. The airflow pulverizer 17 is located on the side of the two-roll milling device 14 away from the fluidized mixing unit 2. The airflow pulverizer 17 is connected to the discharge port of the two-roll milling device 14, allowing the powder material to collide and shear with each other in the airflow pulverizer 17, achieving nanoscale dispersion and reducing residual agglomeration. The collection bin 18 is located on the side of the airflow pulverizer 17 away from the two-roll milling device 14. The collection bin 18 is connected to the airflow pulverizer 17 by a powder feeding pipe 19, and the top of the collection bin 18 can be connected to a dust removal or exhaust gas treatment system to ensure that dust does not leak out. This invention completely eliminates the solvents, dispersants, and subsequent cumbersome drying, solvent recovery, and pollutant treatment steps required by traditional wet processes, saving solvent costs, significantly shortening the process flow, enabling continuous production, and increasing capacity. In addition, it avoids the potential negative impact of solvent and dispersant residues on electrode performance (such as cycle life and self-discharge).
[0016] In this embodiment, a premixing and stirring shaft (not shown in the figure) is rotatably installed inside the mixing tank 1, and a throwing disc is rotatably connected inside the discharge port of the mixing tank 1. The lower end of the premixing and stirring shaft is connected to the throwing disc. The throwing disc uses centrifugal force to diffuse and separate the particulate material, thereby mixing it with the gas in the conveying pipe 11 to form an airflow powder.
[0017] In a preferred embodiment, the fluidized mixing unit 2 includes: a fluidizing cylinder 21, coaxially disposed at one end of the conveying pipe 11, with an annular tube 22 sealed and fixed to the outside of the fluidizing cylinder 21, and the other end of the annular tube 22 sealed and connected to the conveying pipe 11; an inner ring sleeve 23, centrally fixed inside the annular tube 22, with a gear ring 24 fixed in the inner ring sleeve 23; and two planetary carriers 25, symmetrically arranged and rotatably mounted in the inner ring sleeve 23 and the fluidizing cylinder 21, respectively, with a sealing cover 26 rotatably connected in the inner ring sleeve 23, and the sealing cover 26 and the planetary carriers 25... The star carrier 25 is fixed; multiple planetary gears 27 are arranged in a circular array, each planetary gear 27 being rotatably connected to its respective planetary carrier 25; fluidizing rollers 3 are arranged one-to-one with each planetary gear 27, with both ends of each fluidizing roller 3 fixed to a planetary gear 27, and each fluidizing roller 3 having a powder cavity inside; a sun shaft 28 is rotatably connected to each planetary gear 27 at its center, and each sun shaft 28 meshes with the external drive of a planetary gear 27, with one end of one sun shaft 28 extending into and connecting to the conveying pipe 11. A drive motor 29 is fixed to the outside of the conveying pipe 11, and the output end of the drive motor 29 is fixed to the sun axis 28. A powder guide port 31 is located at the end of the fluidizing roller 3, and multiple fluidizing holes 32 are evenly distributed on the outer wall of each fluidizing roller 3. In this fluidized mixing process, the drive motor 29 controls the rotation of the sun axis 28, and each fluidizing roller 3 rotates on its own axis while revolving around the sun axis 28. The airflow powder enters the powder cavity of each fluidizing roller 3 through the sealing cover 26; and the airflow powder in the powder cavity is ejected at high speed through the fluidizing holes 32, causing the powder around the fluidizing roller 3 to... A local fluidized bed is formed. At the same time, the revolution and rotation of the fluidizing roller 3 generate strong three-dimensional spatial shear force and convection motion, which effectively breaks up soft agglomerates. The airflow powder is sprayed out through the fluidizing hole 32 to form a micro-fluidized state, which promotes the micro-diffusion and penetration of nanoparticles. The planetary motion trajectory covers the entire fluidizing cylinder 21 cavity, avoiding the dead zone problem of static mixers and ensuring the uniformity of the ratio. Compared with traditional mechanical stirring and mixing, this device can effectively solve the problem of powder agglomeration and cause less damage to the carbon nanotube body, which is more conducive to maintaining its aspect ratio and inherent conductivity.
[0018] In this embodiment, an annular temperature cavity is formed in the side wall of the fluidizing cylinder 21. An inlet pipe 4 and a outlet pipe 41 are connected to the outside of the annular temperature cavity. One end of the inlet pipe 4 is connected to a heat medium pipe 42, and one end of the outlet pipe 41 is connected to a return pipe 43. The other end of the return pipe 43 is connected to a medium tank. During the fluidized mixing process, the friction and mechanical shear between particles will generate heat. The cooling medium is delivered to the annular temperature cavity through the inlet pipe 4 to achieve timely and uniform cooling control. In addition, it is necessary to appropriately raise the temperature to reduce the viscosity of certain additives (such as polymer binder precursors) or promote surface modification reactions. At this time, the heating medium can be switched to maintain the process temperature.
[0019] In this embodiment, the fluidization orifice 32 is configured as a conical structure, and the conical tip of the fluidization orifice 32 is connected to the powder cavity, so that the airflow powder can be fully diffused when discharged through each fluidization orifice 32; each powder cavity is provided with multiple soft ceramic grinding balls 33, which can be in a continuous random rolling and collision state with the fluidization roller 3 during the fluidization process. When the powder airflow passes through these moving grinding balls, the agglomerates are not only impacted by the airflow, but also subjected to slight, high-frequency collisions, compression and shearing between the grinding balls and between the grinding balls and the cavity wall. The soft ceramic grinding balls 33 can provide effective grinding force to break the airflow powder agglomeration blockage phenomenon, and minimize the scratch damage or cutting of the single-wall carbon nanotube wall.
[0020] In this embodiment, a mixing sleeve 44 is rotatably connected between two planetary carriers 25 inside the fluidizing cylinder 21. The mixing sleeve 44 has multiple guide holes, and one end of each fluidizing roller 3 is rotatably connected to the guide holes. The mixing sleeve 44 has a trapezoidal cross-section, and its diameter at the end near the inner ring sleeve 23 is smaller than the diameter at the other end. A grinding chamber 45 is provided at the end of the fluidizing cylinder 21 away from the inner ring sleeve 23. An inclined channel 46 is provided on the inner wall of the fluidizing cylinder 21. During the fluidization process, the mixing sleeve 44 can rotate continuously, and the airflow powder discharged through the fluidization hole 32 can be further mixed in the mixing sleeve 44 and enter the grinding chamber 45 through the inclined channel 46. A powder discharge hole 47 is provided on the side wall of the fluidizing cylinder 21 at the end of the grinding chamber 45, and one end of the air duct 16 is connected to the powder discharge hole 47.
[0021] In a preferred embodiment, a sealing disc 5 is rotatably connected inside the grinding chamber 45, and multiple couplings 51 are arranged around the circumference of the grinding chamber 45. One end of each coupling 51 is connected through to the sealing disc 5 and is fixed coaxially with the planetary gear 27. Multiple elastic rollers 52 corresponding to the couplings 51 are provided inside the grinding chamber 45. One end of each elastic roller 52 is fixed with a sliding shaft, and one end of the sliding shaft is slidably connected to the coupling 51. An internal spring is provided between the sliding shaft and the coupling 51 so that each elastic roller 52 can slide freely axially. A rubber roller 53 is rotatably arranged in the center of the grinding chamber 45, and one end of the rubber roller 53 is connected to one end of another sun shaft 28.
[0022] In this embodiment, the elastic roller 52 is composed of multiple airbag sleeves arranged in a row. The airbag sleeves are elastically deformed and roll in contact with the rubber roller 53 and the inner wall of the grinding chamber 45. The cooperation between the elastic roller 52 and the rubber roller 53 not only generates crushing and shearing force, but the deformation and recovery of the elastic roller 52 also generate a "kneading" effect, which is more conducive to breaking down and dispersing the agglomerates, avoiding the violent crushing in traditional equipment, and the dispersion effect is more delicate and uniform.
[0023] In this embodiment, a positioning disk 6 is rotatably mounted at one end of the grinding chamber 45 away from the sealing disk 5. The other end of the elastic roller 52 is slidably connected to the positioning disk 6 via a guide shaft 54. A shaft tube 61 is fixed to one side of the positioning disk 6, and one end of the rubber roller 53 is rotatably connected to the shaft tube 61. An assembly base 62 is fixed at one end of the fluidizing cylinder 21 near the positioning disk 6. An end cover 63 is fixed inside the assembly base 62, and a fixing tooth 64 is rotatably connected inside the end cover 63. The end of the rubber roller 53 is fixed to the fixing tooth 64. A swashplate 65 is rotatably connected to the end cover 63, and a transmission tooth is coaxially fixed on the swashplate 65. Multiple driven teeth 66 are rotatably arranged circumferentially inside the end cover 63. The fixing tooth 64 engages with the transmission tooth through the driven teeth 66. A spherical shaft is provided on the shaft tube 61. A guide plate 67 is rotatably mounted on the spherical shaft. One end of each guide shaft 54 abuts against one side of the guide plate 67, and the inclined section of the swash plate 65 abuts against the other side of the guide plate 67. Specifically, after the airflow powder enters the grinding chamber 45, it flows into the gap between the elastic roller 52, the rubber roller 53, and the grinding chamber 45. The rubber roller 53 rotates synchronously with the sun shaft 28 and controls the rotation of the swash plate 65 by the meshing action between the fixed tooth 64, the driven tooth 66, and the transmission tooth. During the rotation, the swash plate 65 pushes the guide plate 67 to sway, thereby causing relative axial displacement between the elastic rollers 52. In this way, the airflow powder can be fully ground and kneaded by the elastic roller 52, the rubber roller 53, and the grinding chamber 45, providing sufficient shear force to break up hard agglomerates of single-walled carbon nanotubes, resulting in a more uniform dispersion effect.
[0024] A dry-process conductive agent for single-walled carbon nanotubes is prepared by a method comprising the following steps: Step 1: Weigh the single-walled carbon nanotube powder and the required additives (such as graphene, carbon black, dispersant or surface modifier) according to the predetermined ratio, and then feed the raw materials into the tank from the feed port above the mixing tank 1 through each feeding system, and use the premixing stirring shaft to stir it to make it initially mixed. Step 2: The air intake system 12 is activated, and gas (usually an inert gas such as nitrogen or dry air) enters the conveying pipe 11 through the air intake pipe 13, forming a horizontal airflow. The discharge port at the bottom of the mixing tank 1 is opened, allowing the raw material to fall into the conveying pipe 11 so that the high-speed airflow can carry the raw material into the fluidized mixing unit 2. In the fluidized mixing unit 2, the powder airflow is distributed to the powder chambers of each fluidizing roller 3. Driven by the drive motor 29, the sun shaft 28 rotates, and through gear meshing, multiple planetary gears 27 rotate on their own axis while revolving around the sun shaft 28. This causes the powder airflow in the powder chamber to be ejected at high speed through the fluidization holes 32, forming a local fluidized bed around the fluidizing roller 3, promoting the microscopic diffusion and penetration of nanoparticles. Then, the powder airflow enters the grinding chamber 45 through the inclined channel 46, where the elastic roller 52, in conjunction with the rubber roller 53, provides crushing and shearing force to the powder airflow, achieving dynamic grinding. Step 3: Start the induced draft fan 15 to draw the fluidized and mixed material into the double roller mill 14 through the air duct 16. The material passes through the gap between the two rollers and is ground and further mixed under high shear force. Step 4: After grinding, the material enters the airflow pulverizer 17 through the discharge port. Inside the airflow pulverizer 17, the high-speed airflow causes the material particles to collide and shear with each other, achieving nanoscale dispersion and reducing residual agglomeration. Step 5: After crushing, the material is fed into the collection bin 18 through the powder feeding pipe 19. The finished product is taken out from the collection bin 18, tested, and then sealed and packaged.
[0025] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.
Claims
1. A dry-process equipment for preparing single-walled carbon nanotube conductive agents, characterized in that, It includes: A batching tank (1) is provided with a feeding port on its top, and multiple feeding systems are provided outside the batching tank (1); The conveying pipe (11) is horizontally fixed below the batching tank (1) and connected to the discharge port of the batching tank (1); An air intake system (12) is located directly below the mixing tank (1). An air intake pipe (13) is vertically fixed on the outer wall of the conveying pipe (11). The other end of the air intake pipe (13) is connected to the air intake system (12). A fluidized mixing unit (2) is located on one side of the mixing tank (1), and the fluidized mixing unit (2) is sealed and connected to one end of the conveying pipe (11); A double-roll milling device (14) is set on the side of the fluidized mixing unit (2) away from the conveying pipe (11). An induced draft fan (15) is mounted above the double-roll milling device (14). One end of the induced draft fan (15) is connected to the fluidized mixing unit (2) through an air duct (16). An airflow pulverizer (17) is located on the side of the twin-roll mill (14) away from the fluidized mixing unit (2), and the airflow pulverizer (17) is connected to the discharge port of the twin-roll mill (14); The collection bin (18) is located on the side of the airflow pulverizer (17) away from the double roller mill (14), and a powder feeding pipe (19) is connected between the collection bin (18) and the airflow pulverizer (17).
2. The apparatus for preparing a dry conductive agent using single-walled carbon nanotubes according to claim 1, characterized in that: The mixing tank (1) is equipped with a premixing shaft that rotates inside, and a discharge plate is rotatably connected inside the discharge port of the mixing tank (1). The lower end of the premixing shaft is connected to the discharge plate.
3. The apparatus for preparing a dry conductive agent using single-walled carbon nanotubes according to claim 1, characterized in that: The fluidized mixing unit (2) includes: A fluidizing cylinder (21) is coaxially disposed at one end of a conveying pipe (11). A ring pipe (22) is sealed and fixed to the outside of the fluidizing cylinder (21). The other end of the ring pipe (22) is sealed and connected to the conveying pipe (11). The inner ring sleeve (23) is fixed in the center inside the ring tube (22), and a toothed ring (24) is fixed in the inner ring sleeve (23). The planetary carriers (25) are two symmetrically arranged and are rotatably installed in the inner ring sleeve (23) and the fluidizing cylinder (21) respectively. A sealing cover (26) is rotatably connected in the inner ring sleeve (23), and the sealing cover (26) is fixed to the planetary carriers (25). The planetary gears (27) are arranged in a circular array, and each planetary gear (27) is rotatably connected to each planet carrier (25); Fluidizing rollers (3) are arranged one-to-one with each of the planetary gears (27). The two ends of each fluidizing roller (3) are fixed to the planetary gears (27). A powder cavity is opened in the fluidizing roller (3). A sun shaft (28) is centrally rotatably connected to each of the planetary gears (27). Each sun shaft (28) meshes with the planetary gears (27) for transmission. One end of one of the sun shafts (28) extends into and is connected to the conveying pipe (11). A drive motor (29) is fixed outside the conveying pipe (11). The output end of the drive motor (29) is fixed to the sun shaft (28). The powder guide port (31) is located at the end of the fluidizing roller (3), and multiple fluidizing holes (32) are uniformly provided on the outer wall of each fluidizing roller (3).
4. The apparatus for preparing a dry conductive agent using single-walled carbon nanotubes according to claim 3, characterized in that: The fluidizing cylinder (21) has an annular temperature cavity inside its side wall. An inlet pipe (4) and a drain pipe (41) are connected to the outside of the annular temperature cavity. One end of the inlet pipe (4) is connected to a heat medium pipe (42), and one end of the drain pipe (41) is connected to a return pipe (43). The other end of the return pipe (43) is connected to a medium tank.
5. The apparatus for preparing a dry conductive agent using single-walled carbon nanotubes according to claim 3, characterized in that: The fluidization orifice (32) is configured as a conical structure, and the conical tip of the fluidization orifice (32) is connected to the powder cavity; Each of the powder chambers is provided with multiple soft ceramic grinding balls (33).
6. The apparatus for preparing a dry conductive agent using single-walled carbon nanotubes according to claim 3, characterized in that: The fluidizing cylinder (21) is rotatably connected between two planetary carriers (25). The mixing sleeve (44) has multiple guide holes, and one end of each fluidizing roller (3) is rotatably connected to the guide hole. The cross-section of the mixing sleeve (44) is trapezoidal, and the diameter of one end near the inner ring sleeve (23) is smaller than the diameter of the other end; a grinding chamber (45) is provided at one end of the fluidizing cylinder (21) away from the inner ring sleeve (23), and an inclined channel (46) is provided on the inner wall of the fluidizing cylinder (21). A powder discharge hole (47) is provided on the side wall of the fluidizing cylinder (21) at one end of the grinding chamber (45), and one end of the air pipe (16) is connected to the powder discharge hole (47).
7. The apparatus for preparing a dry conductive agent using single-walled carbon nanotubes according to claim 6, characterized in that: The grinding chamber (45) is rotatably connected to a sealing plate (5), and multiple couplings (51) are arranged around the inner circumference of the grinding chamber (45). One end of each coupling (51) is connected through to the sealing plate (5) and fixed to the same axis as the planetary gear (27). The grinding chamber (45) is provided with a plurality of elastic rollers (52) corresponding to the coupling (51). One end of each elastic roller (52) is fixed with a sliding shaft. One end of the sliding shaft is slidably connected to the coupling (51). An inner spring is provided between the sliding shaft and the coupling (51). A rubber roller (53) is rotatably mounted in the center of the grinding chamber (45), and one end of the rubber roller (53) is connected to one end of the other sun shaft (28).
8. The apparatus for preparing a dry conductive agent using single-walled carbon nanotubes according to claim 7, characterized in that: The elastic roller (52) is composed of multiple airbag sleeves arranged in a row, and the airbag sleeves are elastically deformed and roll in contact with the inner wall of the rubber roller (53) and the grinding chamber (45).
9. The apparatus for preparing a dry conductive agent using single-walled carbon nanotubes according to claim 7, characterized in that: A positioning disk (6) is rotatably provided at one end of the grinding chamber (45) away from the sealing disk (5). The other end of the elastic roller (52) is slidably connected to the positioning disk (6) through the guide shaft (54). A shaft tube (61) is fixed on one side of the positioning disk (6). One end of the rubber roller (53) is rotatably connected to the shaft tube (61). The fluidizing cylinder (21) has an assembly base (62) fixed at one end near the positioning plate (6). An end cover (63) is fixed inside the assembly base (62). A fixed tooth (64) is rotatably connected inside the end cover (63). The end of the rubber roller (53) is fixed to the fixed tooth (64). A swash plate (65) is rotatably connected to the end cover (63). A transmission tooth is coaxially fixed on the swash plate (65). A plurality of driven teeth (66) are circumferentially arranged inside the end cover (63). The fixed tooth (64) meshes with the transmission tooth through the driven tooth (66). The shaft tube (61) is provided with a spherical shaft, and a guide plate (67) is rotatably mounted on the spherical shaft. One end of each guide shaft (54) abuts against one side end face of the guide plate (67), and the inclined section of the swashplate (65) abuts against the other side end face of the guide plate (67).
10. A method for preparing a dry conductive agent using single-walled carbon nanotubes, comprising using the equipment for preparing a dry conductive agent using single-walled carbon nanotubes as described in claim 9, characterized in that, It includes the following steps: Step 1: Weigh the single-walled carbon nanotube powder and the required additives according to the predetermined ratio, and then feed the raw materials into the tank from the feed port above the mixing tank (1) through each feeding system. Use the premixing stirring shaft to stir and make them initially mixed. Step 2: Turn on the air intake system (12), and the gas enters the conveying pipe (11) through the air intake pipe (13) to form a horizontal airflow. Open the bottom discharge port of the batching tank (1) so that the raw material falls into the conveying pipe (11) so that the high-speed airflow can carry the raw material into the fluidized mixing unit (2). In the fluidized mixing unit (2), the powder airflow is distributed to the powder chamber of each fluidized roller (3). Driven by the drive motor (29), the sun shaft (28) rotates and drives multiple planetary gears (27) to rotate around the sun shaft (28) while rotating on their own axis. This causes the powder airflow in the powder chamber to be ejected at high speed through the fluidization hole (32), so that the powder around the fluidized roller (3) forms a local fluidized bed, which promotes the microscopic diffusion and penetration of nanoparticles. Then the powder airflow enters the grinding chamber (45) through the inclined channel (46). The elastic roller (52) and the rubber roller (53) provide crushing and shearing force to the powder airflow to achieve dynamic grinding. Step 3: Start the induced draft fan (15) and draw the fluidized and mixed material into the double roller mill (14) through the air duct (16). The material passes through the gap between the two rollers and is ground and further mixed under high shear force. Step 4: After grinding, the material enters the airflow pulverizer (17) through the discharge port. Inside the airflow pulverizer (17), the high-speed airflow causes the material particles to collide and shear with each other, achieving nanoscale dispersion and reducing residual agglomeration. Step 5: After crushing, the material is fed into the collection bin (18) through the powder feeding pipe (19). The finished product is taken out from the collection bin (18), tested, and then sealed and packaged.