Polymerization reactor for preparing polyimide

Abstract

This invention provides a polymerization reactor for polyimide preparation, belonging to the field of polymerization reactor technology. It includes a reactor body, with an integrally cast reactor bottom and a integrally cast reactor top. A motor mounting slot is provided at the center of the bottom of the reactor bottom. Eight drainage holes are evenly spaced circumferentially on the outer wall of the reactor body. The reactor body and reactor bottom are equipped with up-and-down and in-and-outward churning components. This invention uses high-speed centrifugal force to throw the solution from the lower interior of the reactor body and guide it to different circumferential trajectories on the upper interior of the reactor body. This achieves both up-and-down churning of the solution and redistribution of the solution from the outside to the inside of the reactor body, ensuring efficient subsequent mixing and uniform mass and heat transfer.

Description

Technical Field

[0001] This invention belongs to the field of polymerization reactor technology, and specifically relates to a polymerization reactor for preparing polyimide. Background Technology

[0002] Polymerization reactors are core reaction equipment used in chemical, polymer materials, and pharmaceutical fields to polymerize monomer molecules into high molecular weight polymers. They are widely used in the synthesis processes of plastics, rubber, fibers, resins, and other products. By precisely controlling temperature, pressure, stirring rate, and material ratio, they ensure that the reaction proceeds efficiently and safely, and can regulate the molecular weight distribution of polymers and product performance.

[0003] A reaction vessel provides a closed environment for the preparation of polyimide, allowing control over conditions such as reactant concentration, temperature, reaction time, and stirring rate. To improve the quality of polyimide preparation, the material solution needs to be stirred for thorough mixing. However, the high viscosity of the material solution makes it difficult to fully mix materials at different heights and positions during stirring, resulting in low mixing efficiency, uneven mass and heat transfer, and ultimately unstable molecular weight of the product, thus affecting product performance. Furthermore, dianhydrides and diamines need to be added during the polyimide preparation process. When added, dianhydrides and diamines generally fall to fixed positions in the reaction vessel, easily forming localized high-concentration areas. Even with the stirring blades working, these locally concentrated dianhydrides and diamines need to be dispersed within a small area before further mixing with the solvent throughout the reaction vessel, resulting in a relatively slow mixing reaction process.

[0004] Therefore, a polymerization reactor for the preparation of polyimide is proposed. Summary of the Invention

[0005] The present invention provides a polymerization reactor for the preparation of polyimide, the purpose of which is to solve the problems mentioned above.

[0006] This invention provides a polymerization reactor for polyimide preparation, comprising a reactor body, a reactor bottom integrally cast at the bottom, and a reactor top integrally cast at the top. A motor mounting slot is provided at the center of the bottom of the reactor bottom. Eight drain holes are evenly spaced circumferentially on the outer wall of the reactor body. The reactor body and reactor bottom are equipped with vertical and horizontal turbulence components. The reactor body is equipped with a solvent adding component and a liquid pushing component. A reactor lid is bolted to the top of the reactor top. The vertical and horizontal turbulence components are bolted together. A drive motor is located at the top of the motor mounting slot. The drive motor is fixedly connected to a centrifugal rotating platform through its output end on one side. A centrifugal cavity is formed in the middle of the centrifugal rotating platform, and a number of centrifugal holes are formed at equal intervals on the outer circumference of the centrifugal rotating platform. An upper guide groove is formed at the center of the top of the centrifugal rotating platform. A lower guide groove is formed on the top of the centrifugal cavity near the upper guide groove. A lower horizontal pipe is provided on the outer circumference of the reactor body near the outer side of the drain hole, and an upper horizontal pipe is provided through the reactor body on the outer circumference of the reactor body near the upper horizontal pipe. An arc-shaped connecting pipe is provided between one end of the lower horizontal pipe and the upper horizontal pipe.

[0007] Furthermore, the solvent addition assembly includes two stepper motors symmetrically arranged on the outer wall of the reactor body. A liquid storage tube is provided on the inner wall of the reactor body near the stepper motors. The bottom of the liquid storage tube has eight filling holes, and one end of the liquid storage tube is provided with a sealing head. The top of the liquid storage tube has an injection hole, and an injection pipe is provided on the outer side of the top of the liquid storage tube near the injection hole. The stepper motor is fixedly connected to a rotating disk through one of its output ends. An arc plate is provided on the outer wall of the rotating disk away from the output end of the stepper motor near the outer circumference. The injection pipe passes through the reactor lid.

[0008] Furthermore, eight oblique through holes are evenly spaced around the outer wall of the reactor body near the upper position of the drain hole. The liquid pushing assembly includes an oblique base platform located on the outer wall of the reactor body near the outer side of the oblique through holes. An electric push rod is provided at the center of one side of the outer wall of the oblique base platform. The electric push rod is fixedly connected to a liquid pushing platform through its output end on one side. A flow guide platform is provided on one side of the top of the liquid pushing platform.

[0009] Furthermore, the lengths of the eight upper horizontal tubes are all different, and the lengths of the eight upper horizontal tubes increase in a stepwise manner. Both the upper and lower horizontal tubes are connected to the arc-shaped connecting tube. By adopting the above technical solution, using eight upper horizontal tubes of different lengths, the distance between one end of the eight upper horizontal tubes and the center of the reactor body can be different. The eight upper horizontal tubes will evenly distribute the upward flowing solution on different circumferential trajectories inside the reactor body, thereby achieving uniform distribution of the solution inside and outside and improving the effect of subsequent stirring and mixing.

[0010] Furthermore, the outer circumferential surface of the centrifugal rotating platform is dynamically sealed to the inner circumferential surface of the reactor body, the centrifugal circular cavity and the upper guide groove are both connected to the lower guide groove, and the cross-sections of the upper guide groove and the lower guide groove are both isosceles trapezoids; By adopting the above technical solution, the sealing of the contact parts between the centrifugal rotating platform and the reactor body can be guaranteed by using the dynamic sealing fit between the centrifugal rotating platform and the reactor body, avoiding the solution from clogging the joint. With the use of the connected flow guiding structure, the solution can enter the centrifugal cavity under the guidance of the upper flow guiding groove, and under the guidance of the lower flow guiding groove, the solution can be gathered to the outer periphery of the centrifugal cavity under the centrifugal action.

[0011] Furthermore, the eight filling holes are distributed with increasing spacing between adjacent holes from the inner wall of the reactor body to the center of the reactor body. By adopting the above technical solution and using the eight filling holes with a specific spacing value, dianhydride and diamine can be added evenly to the solution in the reactor. The amount of dianhydride and diamine in contact with the solution in the reactor gradually decreases from the outside to the inside, adapting to the change in the amount of solution in the reactor from the outside to the inside, improving the mixing effect of dianhydride and diamine with the solution and accelerating the reaction process.

[0012] Furthermore, the outer circumferential surfaces of the rotating disk and the arc plate are dynamically sealed to the inner circumferential surface of the liquid storage tube. By adopting the above technical solution, the sealing of the contact surface between the rotating disk and the arc plate and the liquid storage tube can be guaranteed, avoiding leakage of dianhydride and diamine solvents and ensuring the accuracy of the addition amount of dianhydride and diamine solvents.

[0013] Furthermore, the top of the flow guide platform has an inclined surface near one side wall, and the bottom of the liquid pushing platform matches and fits the upper flow guide groove. By adopting the above technical solution, the inclined surface can be used to guide the solution, causing it to flow towards the center of the reactor. Under the reciprocating push of the pusher, the solution on the upper guide channel can be pushed towards the centrifugal cavity, accelerating the flow rate from the outer layer to the inner layer of the upper guide channel. This avoids the solution on the upper guide channel being affected by fluid viscosity and frictional resistance. During the natural gravity flow process, the outer layer liquid is usually slower than the inner layer because it is in contact with the inner wall of the reactor. By pushing the outer layer solution to flow towards the inner layer, the flow uniformity and speed are improved, thereby allowing the inner and outer layers of solution inside the reactor to mix together.

[0014] Furthermore, the end of the sealing head furthest from the stepper motor does not contact the stirring shaft and stirring paddle installed inside the reactor; By adopting the above technical solution, the smooth rotation of the stirring shaft and the stirring paddle can be guaranteed, the rotation of the stirring shaft and the stirring paddle can be avoided, and one end of the liquid storage tube can be adjusted to the center position of the reactor as much as possible.

[0015] Furthermore, the arc plate is misaligned with the injection hole after circumferential movement; By adopting the above technical solution, not only can the arc plate block the liquid filling hole, but it can also prevent the liquid injection hole from being blocked, ensuring that dianhydride and diamine solvent are added smoothly.

[0016] The beneficial effects of this invention are as follows: 1. This invention uses high-speed centrifugal force to throw the solution from the lower inner layer of the reactor body and guide it to different circumferential trajectories on the upper layer of the reactor body. This achieves the simultaneous up-and-down churning of the solution and the redistribution of the solution from the outside to the inside of the reactor body. This internal and external churning of the solution ensures the efficiency of subsequent stirring and mixing, and guarantees the uniformity of mass and heat transfer. The reciprocating pushing of the solution by the pusher platform can push the solution on the upper guide channel toward the centrifugal cavity, accelerating the flow rate from the outer layer to the inner layer of the upper guide channel. By pushing the outer layer solution to the inner layer, the uniformity and speed of flow are improved, thereby mixing the inner and outer layers of solution inside the reactor body.

[0017] 2. The present invention uses a solvent addition component to simultaneously add dianhydride and diamine solvents at different circumferential positions, so that the amount of dianhydride and diamine solvents added inside the reactor body is more on the outside and less on the inside, so as to adapt to the amount of solution at different positions inside the reactor body, thereby improving the subsequent mixing effect and accelerating the reaction process.

[0018] Other features and advantages of the invention will be set forth in the following description, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of the invention may be realized and obtained by means of the structures particularly pointed out in the description and the drawings. Attached Figure Description

[0019] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used together with the embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings: Figure 1 This is a schematic diagram of the structure of an embodiment of the present invention; Figure 2 This is a schematic diagram of the reactor body structure according to an embodiment of the present invention; Figure 3This is a three-dimensional cross-sectional schematic diagram of the reactor body according to an embodiment of the present invention; Figure 4 This is a three-dimensional cross-sectional schematic diagram of the centrifugal rotating stage according to an embodiment of the present invention; Figure 5 This is a three-dimensional cross-sectional schematic diagram of the reactor body and solvent addition component according to an embodiment of the present invention; Figure 6 This is an embodiment of the present invention. Figure 5 Enlarged diagram of point A in the diagram; Figure 7 This is a schematic diagram of the liquid storage circular tube structure according to an embodiment of the present invention; Figure 8 This is a schematic diagram of the arc plate structure according to an embodiment of the present invention; Reference numerals: 1. Reactor body; 11. Reactor bottom; 111. Motor mounting slot; 12. Reactor top; 13. Drain hole; 14. Slanted through hole; 2. Upper and lower and inner and outer churning components; 21. Drive motor; 22. Centrifugal rotating platform; 221. Centrifugal cavity; 222. Centrifugal hole; 223. Upper guide channel; 224. Lower guide channel; 23. Lower horizontal pipe; 24. Arc connecting pipe; 25. Upper horizontal pipe; 3. Solvent adding component; 31. Stepper motor; 32. Liquid storage tube; 321. Liquid filling hole; 322. Sealing head; 323. Liquid injection hole; 324. Liquid injection pipe; 33. Rotating disk; 34. Arc plate; 4. Liquid pushing component; 41. Slanted base; 42. Electric push rod; 43. Liquid pushing platform; 431. Guide platform; 5. Reactor lid. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. The same reference numerals in the drawings represent the same components. It should be noted that the described embodiments are only some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the described embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0021] Example 1 Reference Figure 1-4This invention provides a polymerization reactor for preparing polyimide, comprising a reactor body 1, a reactor bottom 11 integrally cast at the bottom of the reactor body 1, and a reactor top 12 integrally cast at the top of the reactor body 1. A motor mounting groove 111 is provided at the center of the bottom of the reactor bottom 11. Eight drain holes 13 are provided circumferentially at equal intervals on the outer side wall of the reactor body 1. The reactor body 1 and the reactor bottom 11 are provided with up-and-down and in-and-outward turbulence components 2. The reactor body 1 is provided with a solvent adding component 3 and a liquid pushing component 4. The top of the reactor top 12 is fixedly connected to the reactor cover 5 by bolts. The upper and lower, and inner and outer tumbling components 2 include a drive motor 21 fixed to the top of the motor mounting slot 111 by bolts. The drive motor 21 is fixedly connected to a centrifugal rotating platform 22 through its output end on one side. A centrifugal cavity 221 is formed in the middle of the interior of the centrifugal rotating platform 22, and a plurality of centrifugal holes 222 are formed at equal intervals on the outer circumference of the centrifugal rotating platform 22. An upper guide groove 223 is formed at the center of the top of the centrifugal rotating platform 22, and the top of the interior of the centrifugal cavity 221 is close to the upper guide groove 223. A lower guide groove 224 is provided on one side of the centrifugal rotating platform 22. The outer circumferential surface of the centrifugal rotating platform 22 is dynamically sealed to the inner circumferential surface of the reactor body 1. The centrifugal cavity 221 and the upper guide groove 223 are both connected to the lower guide groove 224. The cross-sections of the upper guide groove 223 and the lower guide groove 224 are both isosceles trapezoids. By utilizing the dynamically sealed connection between the centrifugal rotating platform 22 and the reactor body 1, the sealing of the contact part between the centrifugal rotating platform 22 and the reactor body 1 can be guaranteed, preventing the solution from clogging the screw joint. The flow guiding structure, under the guidance of the upper flow guiding groove 223, allows the solution to enter the centrifugal cavity 221, and under the guidance of the lower flow guiding groove 224, the solution gathers to the outer periphery of the centrifugal cavity 221 under centrifugal action. A lower horizontal pipe 23 is provided on the outer periphery of the reactor body 1 near the outer side of the drain hole 13, and an upper horizontal pipe 25 is provided through the reactor body 1 on the outer periphery of the reactor body 1 near the upper part of the lower horizontal pipe 23. An arc connection is provided between one end of the lower horizontal pipe 23 and the upper horizontal pipe 25. The lengths of the eight upper horizontal pipes 25 are different, and the lengths of the eight upper horizontal pipes 25 increase in a step-like manner. Both the upper horizontal pipes 25 and the lower horizontal pipes 23 are connected to the arc-shaped connecting pipe 24. By using the eight upper horizontal pipes 25 of different lengths, the distance from one end of the eight upper horizontal pipes 25 to the center of the reactor body 1 can be different. The eight upper horizontal pipes 25 will evenly distribute the upward flowing solution on different circumferential trajectories inside the reactor body 1, thereby achieving uniform distribution of the solution inside and outside and improving the effect of subsequent stirring and mixing. To improve the mixing effect of the solution within the reactor body 1 by churning it vertically and horizontally, this embodiment uses high-speed centrifugal force to throw the solution from the lower layer of the reactor body 1 and guide it to different circumferential trajectories on the upper layer. This achieves both vertical churning and redistribution of the solution from the outside to the inside of the reactor body 1, ensuring efficient subsequent mixing and uniform mass and heat transfer. Specifically, the drive motor 21 drives the centrifugal rotating platform 22 to rotate at high speed through its output end. Under the high-speed rotation of the centrifugal rotating platform 22, the solution in the centrifugal cavity 221 flows from the inside to the outside due to centrifugal force. The high-speed rotation of the centrifugal rotating platform 22 causes the centrifugal holes 222 on the centrifugal rotating platform 22 to move synchronously in the circumferential direction. When the centrifugal holes 222 and the drain hole 13 coincide, the solution in the centrifugal cavity 221 passes through the centrifugal holes 222 and enters the drain hole 13 under the action of centrifugal force. Under the guidance of the lower horizontal pipe 23 and the arc connecting pipe 24, the solution in the lower layer inside the reactor body 1 is transported to the upper layer inside the reactor body 1 and easily enters the upper horizontal pipe 25. Under the guidance of the eight upper horizontal pipes 25 of different lengths, the eight upper horizontal pipes 25 guide the solution to different circumferential trajectories inside the reactor body 1, so that the solution is evenly distributed inside and outside the reactor body 1, thereby improving the effect of subsequent stirring and mixing.

[0022] In addition, eight oblique through holes 14 are evenly spaced around the outer wall of the reactor body 1 near the upper part of the drain hole 13. The liquid pushing assembly 4 includes an inclined base 41 located on the outer wall of the reactor body 1 near the outer part of the oblique through holes 14. An electric push rod 42 is provided at the center of one side of the outer wall of the inclined base 41. The electric push rod 42 is fixedly connected to a liquid pushing platform 43 through its output end. A guide platform 431 is provided on one side of the top of the liquid pushing platform 43. An inclined surface is provided on one side of the top of the guide platform 431. The bottom of the liquid pushing platform 43 matches and fits the upper guide groove 223. The inclined surface is used to... The device can guide the solution to flow towards the center of the reactor. Under the reciprocating push of the pusher platform 43, the solution on the upper guide channel 223 can be pushed towards the centrifugal cavity 221, which accelerates the flow rate from the outer layer to the inner layer of the upper guide channel 223. This avoids the solution on the upper guide channel 223 being affected by fluid viscosity and frictional resistance. During the natural gravity flow process, the outer layer liquid is usually slower than the inner layer because it is in contact with the inner wall of the reactor body 1. By pushing the outer layer solution to flow towards the inner layer, the flow uniformity and speed are improved, thereby mixing the inner and outer layer solutions inside the reactor body 1.

[0023] Example 2 Reference Figure 5-8Based on the above embodiments, this embodiment of the invention further proposes that the solvent addition component 3 includes two stepper motors 31 symmetrically arranged on the outer wall of the reactor body 1. A liquid storage tube 32 is provided on the inner wall of the reactor body 1 near the stepper motors 31. Eight filling holes 321 are opened at the bottom of the liquid storage tube 32. The eight filling holes 321 are distributed from the inner wall of the reactor body 1 to the center of the reactor body 1 with gradually increasing adjacent spacing. By utilizing the specific spacing of the eight filling holes 321, it is possible to... Dianhydride and diamine are uniformly added to the solution inside the reactor, with the amount of dianhydride and diamine in contact with the solution gradually decreasing from the outside to the inside of the reactor. This adapts to the change in the amount of solution inside the reactor, improving the mixing effect of dianhydride and diamine with the solution and accelerating the reaction process. One end of the liquid storage tube 32 is equipped with a sealing head 322. The end of the sealing head 322 away from the stepper motor 31 does not contact the stirring shaft and stirring paddle inside the reactor, ensuring the smooth rotation of the stirring shaft and stirring paddle and preventing obstruction of their rotation. This allows one end of the liquid storage tube 32 to be adjusted as close as possible to the center position of the reactor. A liquid injection hole 323 is provided at the top of the liquid storage tube 32, and a liquid injection pipe 324 is provided at the outer side of the top of the liquid storage tube 32 near the injection hole 323. A stepper motor 31 is fixedly connected to a rotating disk 33 via its output end. An arc plate 34 is provided on the outer wall of the rotating disk 33 on the side away from the output end of the stepper motor 31, near its outer circumferential surface. The outer circumferential surfaces of both the rotating disk 33 and the arc plate 34 are dynamically sealed to the inner circumferential surface of the liquid storage tube 32. The dynamic sealing cooperation between the rotating disk 33 and the arc plate 34 and the liquid storage tube 32 can ensure the sealing of the contact surface between the rotating disk 33 and the arc plate 34 and the liquid storage tube 32, avoid leakage of dianhydride and diamine solvent, and ensure the accuracy of the addition of dianhydride and diamine solvent. After the arc plate 34 moves 90 degrees in the circumferential direction, it is misaligned with the injection hole 323. This not only allows the arc plate 34 to block the filling hole 321, but also prevents the injection hole 323 from being blocked, ensuring that the dianhydride and diamine solvent are added smoothly. The injection tube 324 passes through the reactor lid 5. To ensure the uniform addition of dianhydride and diamine to the solution within the reactor and thus improve the mixing reaction process, in this embodiment, the solvent addition component 3 can simultaneously and drip-add dianhydride and diamine solvents at different circumferential positions. This results in a higher amount of dianhydride and diamine solvent added to the reactor body 1 at the outer edges and a lower amount added to the inner edges, adapting to the solution volume at different locations within the reactor body 1. This improves the subsequent mixing effect and accelerates the reaction process. Specifically, the required amount of dianhydride and diamine solvent is injected into the injection pipe 324, perpendicular to the injection pipe 324. Under the guidance of the liquid storage tube 32, the dianhydride and diamine solvent enter the storage tube 32, where the dianhydride and diamine solvent are temporarily stored. Then, the stepper motor 31 is controlled to drive the rotating disk 33 to rotate 90 degrees through its output end on one side. The arc plate 34 on the rotating disk 33 moves synchronously in a circular motion. As the position of the arc plate 34 changes, the arc plate 34 separates from the filling hole 321. At this time, the filling hole 321 is exposed, and the dianhydride and diamine solvent in the storage tube 32 drip down through the filling hole 321 under its own gravity and come into contact with the solution inside the reactor body 1.

[0024] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of this invention is defined by the appended claims and their equivalents.

Claims

1. A polymerization reactor for preparing polyimide, characterized in that: The reactor includes a reactor body (1), the bottom of which is integrally cast as a reactor bottom (11), and the top of which is integrally cast as a reactor top (12). A motor mounting groove (111) is provided at the center of the bottom of the reactor bottom (11). Eight drain holes (13) are provided at equal intervals around the outer side of the reactor body (1). The reactor body (1) and the reactor bottom (11) are provided with up-and-down and in-and-outward churning components (2). The reactor body (1) is provided with a solvent adding component (3) and a liquid pushing component (4). The top of the reactor top (12) is fixedly connected to the reactor cover (5) by bolts. The upper and lower and inner and outer tumbling components (2) include a drive motor (21) fixed to the top of the motor mounting slot (111) by bolts. The drive motor (21) is fixedly connected to a centrifugal rotating platform (22) through its output end on one side. A centrifugal cavity (221) is opened in the middle of the centrifugal rotating platform (22), and a number of centrifugal holes (222) are opened at equal intervals on the outer circumference of the centrifugal rotating platform (22). An upper guide is opened at the center of the top of the centrifugal rotating platform (22). The centrifugal cavity (221) has a lower guide groove (224) at the top of the interior near the upper guide groove (223). The outer circumference of the reactor body (1) is provided with a lower horizontal pipe (23) near the outer side of the drain hole (13). An upper horizontal pipe (25) is provided through the outer circumference of the reactor body (1) near the upper horizontal pipe (23). An arc connecting pipe (24) is provided between one end of the lower horizontal pipe (23) and the upper horizontal pipe (25).

2. The polymerization reactor for preparing polyimide according to claim 1, characterized in that: The solvent addition component (3) includes two stepper motors (31) symmetrically arranged on the outer wall of the reactor body (1). A liquid storage tube (32) is provided on the inner wall of the reactor body (1) near the stepper motors (31). Eight liquid filling holes (321) are opened at the bottom of the liquid storage tube (32), and a sealing head (322) is provided at one end of the liquid storage tube (32). An injection hole (323) is opened at the top of the liquid storage tube (32), and an injection pipe (324) is provided at the outer side of the top of the liquid storage tube (32) near the injection hole (323). A rotating disk (33) is fixedly connected to the stepper motor (31) through its output end. An arc plate (34) is provided on the outer wall of the rotating disk (33) away from the output end of the stepper motor (31) near the outer peripheral surface. The injection pipe (324) passes through the reactor lid (5).

3. The polymerization reactor for preparing polyimide according to claim 1, characterized in that: The outer wall of the reactor body (1) is provided with eight oblique through holes (14) at equal intervals around the perimeter above the drain hole (13). The liquid pushing assembly (4) includes an oblique base (41) located on the outer wall of the reactor body (1) near the oblique through hole (14). An electric push rod (42) is provided at the center of one side of the outer wall of the oblique base (41). The electric push rod (42) is fixedly connected to a liquid pushing platform (43) through its output end on one side. A guide platform (431) is provided on one side of the top of the liquid pushing platform (43).

4. The polymerization reactor for preparing polyimide according to claim 1, characterized in that: The lengths of the eight upper horizontal tubes (25) are different, and the lengths of the eight upper horizontal tubes (25) increase in a stepwise manner. The upper horizontal tubes (25) and the lower horizontal tubes (23) are both connected to the arc-shaped connecting tube (24).

5. The polymerization reactor for preparing polyimide according to claim 1, characterized in that: The outer circumferential surface of the centrifugal rotating platform (22) is dynamically sealed to the inner circumferential surface of the reactor body (1). The centrifugal circular cavity (221) and the upper guide groove (223) are both connected to the lower guide groove (224). The cross-sections of the upper guide groove (223) and the lower guide groove (224) are both isosceles trapezoids.

6. The polymerization reactor for preparing polyimide according to claim 2, characterized in that: The eight filling holes (321) are distributed from the inner side wall of the reactor body (1) to the center of the reactor body (1) with the spacing between adjacent holes gradually increasing.

7. The polymerization reactor for preparing polyimide according to claim 2, characterized in that: The outer circumferential surfaces of the rotating disk (33) and the arc plate (34) are dynamically sealed to the inner circumferential surface of the liquid storage tube (32).

8. The polymerization reactor for preparing polyimide according to claim 3, characterized in that: The top of the flow guide platform (431) has an inclined surface on one side wall, and the bottom of the liquid pusher platform (43) matches and fits the upper flow guide groove (223).

9. The polymerization reactor for preparing polyimide according to claim 2, characterized in that: The end of the plug (322) away from the stepper motor (31) does not contact the stirring shaft and stirring paddle inside the reactor.

10. The polymerization reactor for preparing polyimide according to claim 3, characterized in that: The arc plate (34) is misaligned with the injection hole (323) after moving 90 degrees in the circumferential direction.

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