Preparation device and method of carbon nanotube master batch

Abstract

The application discloses a kind of preparation device of carbon nanotube master batch, it is related to carbon nanotube production field, including shell and the screw rod being arranged in the shell inside, U-shaped channel is arranged in the screw rod, and transition piece is sleeved on the screw rod;Partition is arranged in the transition piece, and the partition separates the space in the transition piece into first cavity and second cavity, both ends of the U-shaped channel are communicated with the first cavity and the second cavity respectively, inlet is arranged on the first cavity, and outlet is arranged on the second cavity.The preparation device of carbon nanotube master batch provided in the application, cooling medium is injected into U-shaped channel through inlet and first cavity in the process of screw rod operation, then is discharged from second cavity and outlet, so as to complete a cycle, to cool from the inside of screw rod, so that the situation of local overheating of screw rod can be avoided as far as possible.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of carbon nanotube production, in particular to a preparation device and method of carbon nanotube master batch. BACKGROUND

[0002] It is known that carbon nanotube plastic master batch is prepared by dispersing carbon nanotubes in thermoplastic resin. The application of carbon nanotube plastic particles is generally to add them to plastics to make conductive or static materials, which are intermediate materials of composite materials and functional materials. In the field of conductive plastics, carbon nanotubes have the following advantages compared with carbon black: 1. little impact on impact strength; 2. excellent conductivity; 3. good appearance of finished products. In the production process of its master batch, a double-screw extruder is needed to extrude the mixed dispersion.

[0003] For example, the Chinese patent document with the authorization announcement number CN108084627B and the announcement date of 2021-02-19 and the name of "HIPS-based conductive master batch based on carbon nanotube and graphene compound system and preparation method thereof" first uniformly disperses carbon nanotubes and graphene in volatile inert solvents, respectively, and then processes them for 1 hour through an ultrasonic treatment device. Then, the treated dispersion liquid is stirred in a high-speed stirrer according to a proportion, and then mixed with a compatibilizer at room temperature according to a certain proportion, and then melt-extruded through a double screw to prepare a conductive master batch.

[0004] The existing technology has the following disadvantages: when the screw extrudes the material, the traditional double screw only controls the temperature of the outer wall of the cylinder, but the screw generates heat during the working process due to the shearing process with the material, which is easy to cause local high temperature. Obviously, local high temperature will affect the mechanical properties of the master batch. SUMMARY

[0005] The purpose of the present application is to provide a preparation device and method of carbon nanotube master batch to solve the above-mentioned deficiencies in the prior art.

[0006] In order to achieve the above-mentioned purpose, the present application provides the following technical scheme:

[0007] A preparation device of carbon nanotube master batch comprises a shell and a screw arranged inside the shell, a U-shaped channel is arranged inside the screw, and a transition piece is arranged on the screw;

[0008] A partition plate is arranged inside the transition piece, the partition plate divides the space inside the transition piece into a first cavity and a second cavity, the two ends of the U-shaped channel are respectively communicated with the first cavity and the second cavity, an inlet is arranged on the first cavity, an outlet is arranged on the second cavity, and a cooling medium enters the U-shaped channel through the inlet and the first cavity, and then is discharged from the second cavity and the outlet.

[0009] The carbon nanotube master batch preparation device, the U-shaped channel is two.

[0010] The carbon nanotube master batch preparation device, the screw includes a main shaft and a cylindrical segment arranged on the main shaft, and a limiting structure is arranged between the cylindrical segment and the main shaft to prevent relative rotation therebetween.

[0011] The carbon nanotube master batch preparation device, a convex ring is arranged on the cylindrical segment, and an elastic member is arranged between the convex ring and the shell.

[0012] The carbon nanotube master batch preparation device, a limiting groove is arranged on the shell, a limiting block that is matched with the limiting groove is arranged on the cylindrical segment, and the limiting block is in sliding connection with the limiting groove.

[0013] The carbon nanotube master batch preparation device, an adjusting member is arranged in sliding connection on the transition piece, and the inlet and the outlet are located on a movement stroke of the adjusting member.

[0014] Further comprising a power assembly for driving the adjusting member to move.

[0015] The carbon nanotube master batch preparation device, the adjusting member includes a first sealing ring arranged in sliding connection in the first cavity and a second sealing ring arranged in sliding connection in the second cavity, and a first connecting rod is arranged between the first sealing ring and the second sealing ring.

[0016] The carbon nanotube master batch preparation device, the power assembly includes a transmission ring, a second connecting rod is arranged between the transmission ring and the first sealing ring, and the transmission ring is in rotary connection with the convex ring.

[0017] The carbon nanotube master batch preparation device, an exhaust groove is arranged on the screw.

[0018] A carbon nanotube master batch preparation method based on the carbon nanotube master batch preparation device, including the following steps: S1, preparing active carbon nanotubes; S2, premixing; and S3, granulating.

[0019] In the technical scheme, the carbon nanotube master batch preparation device can inject the cooling medium into the U-shaped channel through the inlet and the first cavity and then discharge the cooling medium from the second cavity and the outlet during the operation of the screw, so that one cycle is completed to cool the screw from the inside, thereby avoiding local overheating of the screw as much as possible. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed in the embodiments. Obviously, the drawings described below only show some embodiments of the present application, and other drawings can also be obtained by those skilled in the art based on these drawings.

[0021] Figure 1 The external overall structure schematic diagram provided for the embodiments of the present application;

[0022] Figure 2 The internal structure schematic diagram provided for the embodiments of the present application;

[0023] Figure 3 The cross-sectional structure schematic diagram provided for the embodiments of the present application;

[0024] Figure 4 The local structure schematic diagram provided for another embodiment of the present application;

[0025] Figure 5 The screw local cross-sectional structure schematic diagram provided for still another embodiment of the present application;

[0026] Figure 6 The screw local cross-sectional structure schematic diagram provided for still another embodiment of the present application;

[0027] Figure 7 The first blocking ring and the second blocking ring connection structure schematic diagram provided for still another embodiment of the present application;

[0028] Figure 8 The Figure 5 The local structure enlarged schematic diagram in a of FIG. 6;

[0029] Figure 9 The Figure 6 The local structure enlarged schematic diagram in A of FIG. 7.

[0030] Explanation of reference signs:

[0031] 1, shell; 2, screw; 201, feeding mixing section; 202, melting section; 203, extruding section; 3, U-shaped channel; 4, transition piece; 5, partition plate; 6, first cavity; 7, second cavity; 8, inlet; 9, outlet; 10, main shaft; 11, cylindrical section; 12, convex ring; 13, elastic piece; 14, rotating part; 15, telescopic groove; 16, limiting groove; 17, limiting block; 18, first blocking ring; 19, second blocking ring; 20, first connecting rod; 21, transmission ring; 22, second connecting rod; 23, exhaust groove; 24, connecting hole; 25, conical region; 26, main channel; 27, first channel; 28, second channel; 29, baffle; 30, transmission block; 31, transmission rope; 32, mounting groove. DETAILED DESCRIPTION

[0032] In order to make the technical personnel in the art better understand the technical solutions of the present application, the present application will be further described in detail below in conjunction with the drawings.

[0033] In the description of the present application, it should be understood that, unless otherwise clearly specified and limited, Figure 6 The position of the inlet 8 relative to the outlet 9 is up, and vice versa. The terms "center", "longitudinal", "transverse", "length", "width", "degree", "up", "down", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0034] With reference to Figures 1-3 The preparation device for carbon nanotube master batch provided by the embodiment of the present application comprises a shell 1 and a screw 2 arranged inside the shell 1. A U-shaped channel 3 is arranged inside the screw 2. A transition piece 4 is sleeved on the screw 2. A partition plate 5 is arranged inside the transition piece 4. The partition plate 5 divides the internal space of the transition piece 4 into a first cavity 6 and a second cavity 7. The two ends of the U-shaped channel 3 are respectively communicated with the first cavity 6 and the second cavity 7. An inlet 8 is arranged on the first cavity 6. An outlet 9 is arranged on the second cavity 7. Cooling medium enters the U-shaped channel 3 through the inlet 8 and the first cavity 6, and then is discharged from the second cavity 7 and the outlet 9.

[0035] Specific, the shell 1 is cylindrical structure, and the shell 1 is provided with heating structure such as electric heating wire, its top is provided with feed inlet, the inside of shell 1 is rotatably provided with two screws 2, two screws 2 are arranged side by side and are engaged with each other, and according to the shape and position of the screw thread on the surface of screw 2, the screw 2 is divided into feed mixing section 201, melting section 202 and extrusion section 203, when the extrusion of material is carried out, two screws 2 are driven by driving motor to rotate synchronously and oppositely, then the material is added from the feed inlet on the top of shell 1 to the position between two feed mixing sections 201, under the action of screw 2 rotation, the material will move along the axial direction of shell 1, and under the extrusion of two screws 2, the shearing action of material is realized, the mixed material will enter melting section 202 for further processing, then extrude through the end of extrusion section 203, so as to realize the whole extrusion process of material, which is prior art, no more description, one of the core innovations of the embodiment of the application is that U-shaped channel 3 is arranged in screw 2, and the U-shaped channel 3 is arranged along the length direction of screw 2, and the openings of the two ends of U-shaped channel 3 are located on the outer circumferential surface of screw 2, the transition piece 4 is a cylindrical structure sleeved on the outside of screw 2, and is located outside the shell 1, which can be fixed on the body of extruder by bolt structure, the transition piece 4 is rotatably sealed with the screw 2, and the space inside the transition piece 4 and the screw 2 forms an annular cavity structure, the partition plate 5 is a circular ring, which is arranged at the middle position inside the transition piece 4, so as to divide the transition piece 4 into two annular cavities, which are first cavity 6 and second cavity 7, the inlet 8 is in communication with the space inside the first cavity 6, and the outlet 9 is in communication with the space inside the second cavity 7, the cooling medium is preferably cold air, so as to send the cooling medium into the first cavity 6 through the inlet 8 during the operation of the screw 2, and fill the first cavity 6 with the cooling medium, during which the cooling medium enters the U-shaped channel 3 through one of the openings of the U-shaped channel 3, since the U-shaped channel 3 rotates synchronously with the screw 2, the position of the opening of the U-shaped channel 3 is uncertain, but in the present application, the first cavity 6 is annular, which can cover the whole rotating stroke of the opening of the U-shaped channel 3, so that the cooling medium always enters the U-shaped channel 3 during the rotation of the screw 2, to realize the continuous supply of cooling medium, then the cooling medium is discharged from the second cavity 7 and the outlet 9, so as to complete a cycle, to cool the screw 2 from the inside, so as to avoid the local overheating of the screw 2 as much as possible, and since the outlet 9 and the inlet 8 are located at the same end of the screw 2, the installation difficulty of the cooling structure can be reduced.

[0036] Preferably, the U-shaped channels 3 in the single screw 2 can be two. The two U-shaped channels 3 are arranged vertically inside the screw 2, that is, one of the U-shaped channels 3 is arranged horizontally, the other U-shaped channel 3 is arranged vertically, and the ends of the two U-shaped channels 3 are arranged staggered, and the cooling medium is injected into the two U-shaped channels 3 at the same time, so as to increase the cold area of the screw 2, thereby improving the cooling effect of the screw 2.

[0037] Since the feeding and mixing section 201 and the melting section 202 of the screw 2 can achieve shearing effect on the material and are accompanied by cavitation phenomenon, the feeding and mixing section 201 and the melting section 202 of the screw 2 are more prone to damage than the extrusion section 203. In order to replace the feeding and mixing section 201 and the melting section 202 of the screw 2 more targetedly, with reference to Figure 4 As another embodiment of the present application, the screw 2 comprises a main shaft 10 and a cylindrical section 11 arranged on the main shaft 10, and a limiting structure is arranged between the cylindrical section 11 and the main shaft 10 to prevent relative rotation therebetween. Specifically, the cylindrical section 11 is sleeved on the outside of the main shaft 10. When the cylindrical section 11 is installed, the cylindrical section 11 is first sleeved on the main shaft 10, and the position of the cylindrical section 11 can be fixed by bolts or other structures, and then the transition piece 4 and other structures are installed on the main shaft 10, the feeding and mixing section 201 and the melting section 202 are arranged on the cylindrical section 11, and the extrusion section 203 is arranged on the main shaft 10. The limiting structure can be a pin shaft and pin hole structure arranged in the radial direction of the cylindrical section 11 and the main shaft 10, so that the main shaft 10 and the cylindrical section 11 can rotate synchronously. The purpose of such arrangement is that when the feeding and mixing section 201 and the melting section 202 are damaged, the transition piece 4 is first removed from the main shaft 10, and then the cylindrical section 11 is removed from the main shaft 10, and a new cylindrical section 11 is installed on the main shaft 10, so as to realize the targeted replacement of the feeding and mixing section 201 and the melting section 202 of the screw 2.

[0038] As the alternative of the bolted cylinder segment 11, preferably, the cylinder segment 11 is provided with a convex ring 12, and the elastic member 13 is arranged between the convex ring 12 and the shell 1. Specifically, the rotating part 14 is arranged on the shell 1 in a rotating mode, and the limiting structure for preventing the rotating part 14 and the shell 1 from being separated from each other is arranged between the rotating part 14 and the shell 1. The convex ring 12 is arranged on the end of the cylinder segment 11 outside the shell 1. The elastic member 13 is preferably a spring, one end of which is fixedly connected to the convex ring 12, and the other end of which is fixedly connected to the rotating part 14. The retractable slot 15 is arranged in the main shaft 10. The end of the cylinder segment 11 away from the transition piece 4 is inserted into the retractable slot 15. The position where the cylinder segment 11 is connected with the extruding segment 203 is provided with an inclined surface for the transition material. The material at this position can move along the axial direction of the shell 1 under the pushing action of the rear material. The pin hole is a long strip structure arranged along the length direction of the main shaft 10. The pin shaft is fixedly connected to the cylinder segment 11, so that when the cylinder segment 11 moves axially, the pin shaft can slide a certain distance in the pin hole. The arrangement is used for the following purposes. When the screw rod 2 rotates normally, the elastic force of the elastic member 13 makes the cylinder segment 11 be away from the transition piece 4. When the rotating speed of the screw rod 2 increases, that is, the added material inside the feeding port increases, the load of the conveying process of the screw rod 2 increases. When the reaction force of the material on the cylinder segment 11 is greater than the elastic force of the elastic member 13, the cylinder segment 11 moves towards the transition piece 4 and stores the elastic force of the elastic member 13. The advantage of the arrangement is that the axial movement of the cylinder segment 11 can protect the cylinder segment 11 by buffering effect, and when the axial movement distances of the two cylinder segments 11 are inconsistent, the thread gap between the two cylinder segments 11 changes, that is, when the thread gap decreases, the threads on the two cylinder segments 11 can produce a squeezing effect on the material to improve the dispersion effect of the material.

[0039] Further, the limiting slot 16 is arranged on the shell 1, the limiting block 17 is arranged on the cylinder segment 11 and matched with the limiting slot 16, and the limiting block 17 is in sliding connection with the limiting slot 16. Specifically, the limiting slot 16 is arranged on the inner circumferential surface of the rotating part 14 and is a long strip structure. The limiting block 17 is a convex structure arranged on the outer circumferential surface of the cylinder segment 11. The length of the limiting slot 16 is 0.5-1 cm greater than the length of the limiting block 17. The arrangement is used for the following purposes. When the screw rod 2 normally conveys the material, the limiting block 17 is in contact with the end of the limiting slot 16 away from the transition piece 4. When the cylinder segment 11 moves axially, the limiting block 17 slides in the limiting slot 16. When the limiting block 17 is in abutment with the other end of the limiting slot 16, the maximum axial movement distance of the cylinder segment 11 is reached, which is between 0.5 cm and 1 cm, so as to realize the axial limiting of the cylinder segment 11.

[0040] Referring to Figure 5 andFigure 8 As another embodiment of the present application, the transition piece 4 is provided with an adjusting piece slidingly arranged thereon, and the inlet 8 and the outlet 9 are located on the movement stroke of the adjusting piece; and a power assembly for driving the adjusting piece to move is further included. The adjusting piece includes a first sealing ring 18 slidingly arranged in the first cavity 6 and a second sealing ring 19 slidingly arranged in the second cavity 7, and a first connecting rod 20 is arranged between the first sealing ring 18 and the second sealing ring 19. Specifically, in order to facilitate the adjustment of the positions of the two sealing rings at the same time, the first connecting rod 20 is connected between the first sealing ring 18 and the second sealing ring 19, and the first connecting rod 20 is slidingly and sealingly connected with the partition plate 5. The power assembly can be an existing reciprocating driving assembly such as an electric push rod. The arrangement has the following effects: when the screw rod 2 rotates normally, a part of the first sealing ring 18 is arranged at the position of the inlet 8 and a part of the second sealing ring 19 is arranged at the position of the outlet 9 by the power assembly, so that the injection and discharge speeds of the cooling medium are not at the maximum value, that is, the cooling effect is not at the maximum value. When the rotation speed of the screw rod 2 is sensed by the rotation speed sensor, that is, the conveying speed of the material is increased, the local high temperature of the screw rod 2 will be more serious. At this time, the adjusting piece is controlled to move horizontally by the power assembly, so that the first sealing ring 18 moves away from the inlet 8 and the second sealing ring 19 moves away from the outlet 9 at the same time, so that the inlet 8 and the outlet 9 are completely opened, so that the injection and discharge speeds of the cooling medium are at the maximum value, so as to improve the cooling effect of the screw rod 2. In this way, the cooling effect of the U-shaped channel 3 on the screw rod 2 is actively adjusted based on the rotation speed of the screw rod 2.

[0041] As the alternative solution of the electric push rod controlling the horizontal movement of the adjusting member, preferably, the power assembly comprises a transmission ring 21, the second connecting rod 22 is arranged between the transmission ring 21 and the first blocking ring 18, and the transmission ring 21 is rotationally connected with the convex ring 12. Specifically, the second connecting rod 22 is arranged on the first blocking ring 18 and penetrates the side wall of the transition piece 4, the end of the second connecting rod 22 is fixedly connected with the transmission ring 21, and the transmission ring 21 is coaxially arranged with the adjusting member, the cylinder segment 11 and other structures, and a limiting mechanism such as a limiting ring is arranged between the transmission ring 21 and the convex ring 12 to prevent axial movement of the two. The purpose of such arrangement is that when the rotating speed of the screw rod 2 increases, the reaction force on the cylinder segment 11 increases, at this time, the cylinder segment 11 is driven to move towards the transition piece 4, and the convex ring 12 and the transmission ring 21 are synchronously moved, under the transmission of the second connecting rod 22 and the first connecting rod 20, the first blocking ring 18 is passively moved away from the inlet 8, and the second blocking ring 19 is passively moved away from the outlet 9, so that the injection and discharge speed of the cooling medium is at the maximum value, and the cooling effect of the U-shaped channel 3 on the screw rod 2 is passively adjusted based on the rotating speed of the screw rod 2. Conversely, when the rotating speed of the screw rod 2 returns to normal, and when the reaction force of the material on the screw rod 2 is less than the elastic force of the elastic member 13, the elastic force of the elastic member 13 is released to drive the adjusting member to move reversely to reset.

[0042] It should be noted that the carbon nanotubes are easy to adsorb air during the mixing process, and gas is generated when the polymer is melted. The residual gas can cause the master batch to have defects such as bubbles and shrinkage. To solve the above problems, referring to Figures 6-7 and Figure 9 As another embodiment of the application, the screw rod 2 is provided with an exhaust groove 23. Specifically, the exhaust groove 23 is arranged on the outer circumferential surface of the main shaft 10, and there should be not less than one, and the cylinder segment 11 is also provided with a connecting hole 24 matched with the exhaust groove 23, the length of the opening of the exhaust groove 23 is greater than the horizontal movement distance of the cylinder segment 11, and the connecting hole 24 is located away from the feeding port, and a filter screen or other blocking structure for preventing material from entering can be arranged at the position of the connecting hole 24. The purpose of such arrangement is that during the extrusion process of the extruder, the gas generated during the melting process is discharged from the position of the exhaust groove 23, so that the master batch can be prevented from having defects such as bubbles and shrinkage.

[0043] Further, the U-shaped channel 3 is tapered at one end close to the outlet 9, and the main shaft 10 is provided with a tapered area 25, the exhaust groove 23 comprises a main channel 26, a first channel 27 and a second channel 28 which are communicated with the main channel 26, the opening end of the first channel 27 is located on the outer circumferential surface of the main shaft 10, the second channel 28 is communicated with the tapered area 25, the inside of the exhaust groove 23 is provided with a baffle 29 which is rotatably arranged by a torsion spring (not shown), the main shaft 10 is slidably provided with a transmission block 30, the transmission block 30 and the baffle 29 are provided with a transmission rope 31, and the transmission block 30 is located on the movement stroke of the transmission ring 21. Specifically, the tapered structure is that the size of the opening position of the U-shaped channel 3 is smaller than the size of the middle part, the tapered area 25 is sleeved on the outside of the opening of the U-shaped channel 3, the first channel 27 is arranged along the radial direction of the main shaft 10, the second channel 28 is arranged along the axial direction of the main shaft 10, the baffle 29 is rotatably arranged at the position where the first channel 27 and the second channel 28 are connected by the torsion spring, and has a first position for blocking the first channel 27 and a second position for blocking the second channel 28, the transmission rope 31 is preferably made of a metal material with low ductility, the main shaft 10 is provided with a through hole inside, the transmission rope 31 connects the baffle 29 and the transmission block 30 through the through hole, the main shaft 10 is provided with a mounting groove 32 on the outer surface, and the transmission block 30 is slidably arranged in the mounting groove 32 and cannot be separated from each other, so that when the screw rod 2 rotates normally, in order to avoid the heat loss inside the shell 1, the baffle 29 is in the second position under the action of the torsion spring, at this time the second channel 28 is blocked, the gas in the main channel 26 will be slowly discharged through the first channel 27, when the rotation speed of the screw rod 2 increases, the gas generated inside the shell 1 will also increase, which will make the cylindrical section 11 move axially under stress, thereby driving the transmission ring 21 to move synchronously, during which the transmission ring 21 and the transmission block 30 abut and drive the transmission block 30 to slide horizontally in the mounting groove 32, the baffle 29 is rotated by the transmission rope 31 to switch the baffle 29 from the second position to the first position and store energy for the torsion spring, at this time the first channel 27 is blocked and the second channel 28 is opened, the gas in the main channel 26 will enter the second channel 28, since the second channel 28 is communicated with the tapered area 25, and since the cooling medium will quickly pass through the tapered area 25, a pressure difference will be formed between the tapered area 25 and the second channel 28, so that the flowing cooling medium will have a suction effect on the gas inside the second channel 28, thereby accelerating the discharge of the gas and the heat inside the shell 1, when the rotation speed of the screw rod 2 returns to normal, the transmission ring 21 moves reversely and moves away from the transmission block 30, at this time the elastic force of the torsion spring is released to drive the baffle 29 to rotate reversely, thereby passively switching the baffle 29 from the first position to the second position, during which the transmission block 30 is pulled reversely to slide by the transmission rope 31 to reset.

[0044] The application also provides a preparation method of the carbon nanotube master batch, which is based on the preparation device of the carbon nanotube master batch and comprises the following steps: S1, preparing active carbon nanotubes, dissolving a dispersant (one or more than two of sodium dodecyl benzene sulfonate, polyvinylpyrrolidone, polyvinyl alcohol, xanthan gum, sodium dodecyl sulfate, polyethylene glycol octylphenyl ether, sodium carboxymethyl cellulose, dihexadecyl phosphate, gum arabic, cetyltrimethylammonium bromide, alkylphenol ethylene oxide condensate emulsifier, cetyltrimethylammonium bromide, polyvinylidene fluoride) in a solvent (one or more than two of water, N, N-dimethylformamide, N-methylpyrrolidone, n-butanol, chloroform, anhydrous ethanol, acetone, petroleum ether, ethyl acetate, butyl acetate) to obtain a dispersant solution, then spraying the dispersant solution into the high-speed stirring carbon nanotubes by high-pressure spraying method, and preparing the active carbon nanotubes after high-speed stirring and mixing; S2, premixing, mixing the PE polymer matrix material, the active carbon nanotubes, the dispersant and a coupling agent (one or a mixture of two of a titanate coupling agent and a silane coupling agent); and S3, granulating, extruding and granulating the materials from a double-screw extruder, wherein the screw 2 rotation speed of the double-screw extruder is 100-1000 r / min, the extrusion temperature is 300-150℃, and the die head temperature is 150-250℃.

[0045] The above has described certain exemplary embodiments of the application by way of illustration only, and it is needless to say that those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the application. Therefore, the above drawings and descriptions are illustrative in nature and should not be understood as limiting the scope of protection of the claims of the application.

Claims

1. An apparatus for preparing carbon nanotube masterbatch, comprising a shell and a screw disposed inside the shell, characterized in that, The screw has a U-shaped channel inside and a transition piece is sleeved on the screw; The transition piece is provided with a partition, which divides the internal space of the transition piece into a first cavity and a second cavity. The two ends of the U-shaped channel are respectively connected to the first cavity and the second cavity. The first cavity is provided with an inlet, and the second cavity is provided with an outlet. The cooling medium enters the U-shaped channel through the inlet and the first cavity, and then exits from the second cavity and the outlet. The screw includes a main shaft and a cylindrical section disposed on the main shaft, and a limiting structure is provided between the cylindrical section and the main shaft to prevent relative rotation between the two. A protruding ring is provided on the cylindrical section, and an elastic element is provided between the protruding ring and the shell; A rotating part is rotatably provided on the housing, and a limiting structure is provided between the rotating part and the housing to prevent them from separating from each other. A convex ring is provided on one end of the cylindrical section located outside the housing. One end of the elastic element is fixed to the convex ring, and the other end is fixed to the rotating part. A telescopic groove is provided inside the main shaft, and the end of the cylindrical section away from the transition piece is inserted into the telescopic groove. An adjusting member is slidably disposed on the transition member, and both the inlet and the outlet are located on the movement stroke of the adjusting member; It also includes a power assembly for driving the movement of the adjusting member; The adjusting component includes a first sealing ring slidably disposed in the first cavity and a second sealing ring slidably disposed in the second cavity, and a first connecting rod is provided between the first sealing ring and the second sealing ring; The power assembly includes a transmission ring, and a second connecting rod is provided between the transmission ring and the first sealing ring. The transmission ring is rotatably connected to the convex ring.

2. The apparatus for preparing carbon nanotube masterbatch according to claim 1, characterized in that, There are two U-shaped channels.

3. The apparatus for preparing carbon nanotube masterbatch according to claim 1, characterized in that, The housing is provided with a limiting groove, and the cylindrical section is provided with a limiting block adapted to the limiting groove. The limiting block is slidably connected to the limiting groove.

4. The apparatus for preparing carbon nanotube masterbatch according to claim 1, characterized in that, The screw is provided with an exhaust groove.

5. A method for preparing carbon nanotube masterbatch, based on the apparatus for preparing carbon nanotube masterbatch according to any one of claims 1-4, characterized in that, Includes the following steps: S1, Preparation of activated carbon nanotubes; S2, Premixing; S3, Granulation.

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