Para-aramid polymerization device and polymerization method

Abstract

The invention relates to the technical field of para-aramid fiber production, in particular to a para-aramid fiber polymerization device and a polymerization method. The para-aramid polymerization device comprises a pre-polymerization reactor and a polymerization reactor which are in butt joint, the pre-polymerization reactor comprises a horizontally-arranged machine barrel, a tile lining layer is attached to the inner wall of the machine barrel, a conical screw is arranged in the machine barrel, a screw driving motor and a pin assembly are arranged outside the machine barrel, and the pin assembly comprises a plurality of pins. The pin penetrates through the machine barrel and the tile lining layer in a sealed mode and then abuts against a main shaft of the conical screw, a notch for the pin to penetrate through is formed in threads of the conical screw, the tile lining layer, the main shaft and the pin are all of a hollow structure and are all communicated with a nitrogen cooling circulation system, and the tile lining layer is opposite to the flowing direction of nitrogen in the main shaft. According to the invention, feeding is carried out in an atomization opposite spraying manner, and a reciprocating extrusion mixing structure and a triple strong cooling structure are matched, so that the temperature control effect is good, the reaction material mixing and dispersing effect is good, the HCl-containing waste gas discharge efficiency is high, and high-quality para-aramid resin can be obtained.

Description

Technical Field

[0001] The invention relates to the technical field of para-aramid production, and in particular to a para-aramid polymerization device and a polymerization method. Background Art

[0002] Poly(p-phenylene terephthalamide) (PPTA) is produced by the polycondensation reaction of terephthaloyl chloride (TPC) and p-phenylenediamine (PPD) in a composite solvent of N-methylpyrrolidone (NMP) and a co-solvent, calcium chloride. The polycondensation reaction of terephthaloyl chloride (TPC) and p-phenylenediamine (PPD) needs to be carried out at low temperatures, because the reaction speed of the two monomers is extremely fast and the heat release is large. Too high a temperature will cause the viscosity of the reaction system to increase rapidly, gelling will occur prematurely, and the diffusion of the reaction monomers in the reaction system will be restricted, making it impossible to fully mix evenly. At the same time, the byproduct HCl gas produced by the reaction cannot be discharged in time, which is not conducive to the forward progress of the polymerization reaction, and ultimately leads to low molecular weight and uneven molecular weight distribution of the generated polymer chain, affecting the quality of the fiber formed in the subsequent spinning process. Therefore, temperature control of the reaction system is particularly important.

[0003] The invention patent with application number 201810647812.3 discloses a high-concentration continuous and stable polymerization method and system for poly(p-phenylene terephthalamide). The TPC melt and the PPD reaction liquid are mixed through a monomer mixer and then enter the polymerization system. The polymerization system is composed of a first-stage twin-screw extruder and a second-stage twin-screw extruder. The first-stage twin-screw extruder and the second-stage twin-screw extruder are connected in an L shape. The first-stage screw mainly completes monomer mixing and prepolymerization, and the second-stage screw performs solid phase polycondensation and crushing, and finally obtains para-aramid resin powder. The above technical solution has the following problems: 1. TPC melt and PPD reaction liquid are mixed in a monomer mixer. Since PPD is pre-mixed with a solvent into a reaction liquid before feeding, while TPC is directly fed in a molten state, the volume ratio of the two is very different. They are mixed briefly in the monomer mixer, and the mixing uniformity is poor; 2. The mixed reaction materials enter the first-stage twin-screw extruder for mixing and prepolymerization. The reaction materials are cooled by passing refrigerant through the barrel. Since the twin-screw extruder structure generates a lot of heat itself, and the heat generated by the reaction in the prepolymerization stage is large, and the above-mentioned traditional cooling effect is poor, the prepolymerization reaction temperature cannot be effectively controlled, resulting in an accelerated prepolymerization reaction speed, a too fast increase in the viscosity of the polymerization system, and TPC and PPD are difficult to mix to a microscopic uniformity in a short time, and a high molecular weight PPTA cannot be obtained; 3. Neither the first-stage twin-screw extruder nor the second-stage twin-screw extruder is equipped with a corresponding exhaust structure. The small molecule HCl generated during PPTA polymerization cannot be discharged in time, which will corrode the equipment and affect the service life of the equipment.

[0004] In summary, it is very necessary to provide a polymerization device and a polymerization method that can fully mix the reaction materials, effectively control the reaction temperature and reaction rate, and timely discharge the waste gas containing HCl to obtain high-quality para-aramid resin. Summary of the invention

[0005] In order to solve at least one of the above technical problems, the present invention provides a para-aramid polymerization device, including a prepolymerization reactor and a polymerization reactor connected to each other, the prepolymerization reactor including a horizontally arranged barrel, the inner wall of the barrel being fitted with a tile lining, the interior of the barrel being provided with a conical screw, the exterior of the barrel being provided with a screw drive motor and a pin assembly, the pin assembly including a plurality of pins arranged along the axial direction of the barrel, the pin seal passing through the barrel and the tile lining and then abutting against the main shaft of the conical screw, the thread of the conical screw being provided with a notch for the pin to pass through, the tile lining, the main shaft and the pin are all hollow structures and are all connected to a nitrogen cooling circulation system, the nitrogen flow direction in the tile lining is opposite to that in the main shaft.

[0006] Preferably, the inner cavity of the tile lining is a conical cavity which gradually contracts toward the material inlet direction, the inner cavity of the main shaft is a conical cavity which gradually contracts toward the material outlet direction, the barrel is cylindrical, and is provided with a prepolymerization feed bin, a prepolymerization air outlet and a prepolymerization discharge port in sequence along the direction of material flow, the side walls of the prepolymerization feed bin are relatively provided with a TPC feed port and a PDD feed port, a bin air outlet is provided at the top, the prepolymerization discharge port is connected with the feed port of the polymerization reactor, the barrel is open at one end close to the prepolymerization feed bin, a sealing end cover is provided at the opening, and through holes corresponding to the prepolymerization feed bin, the prepolymerization air outlet and the prepolymerization discharge port are provided on the tile lining; the polymerization reactor comprises a vertically arranged shell, the top of the shell is provided with a feed port, a polymerization air outlet and a stirring drive motor, a stirring and crushing mechanism connected to the stirring drive motor is provided inside, a temperature control component is provided on the outer wall, a conical storage bin is provided at the bottom, and a rotary discharge valve is provided at the bottom of the storage bin.

[0007] Preferably, the thread is divided into a first thread segment, a second thread segment and a third thread segment along the material flow direction, wherein the thread width and the pitch both increase gradually. The first thread segment and the third thread segment cooperate with the pin and are provided with corresponding notches. The notches are staggered and not directly connected axially. The second thread segment is located directly below the pre-polymerization outlet, and a defoaming mechanism is provided at both axial ends in a mirrored manner.

[0008] Preferably, the debubble mechanism includes a first fixed ring, a sliding ring and a second fixed ring arranged axially in sequence, and a magnetic member that makes the sliding ring close to the first fixed ring. The first fixed ring is close to the pin at the first thread segment or the third thread segment, and a plurality of sliding holes are equidistantly arranged on the axial circumference. The sliding ring is provided with a plurality of sliding shafts that cooperate with the sliding holes. The free end of the sliding shaft can extend out of the sliding hole and can slide under the push of the pin, so that the sliding ring is close to the second fixed ring.

[0009] Preferably, the free end of the sliding shaft is a spherical surface, a plurality of first flow holes are equidistantly arranged on the circumference of the first fixing ring, a plurality of second flow holes are equidistantly arranged on the circumference of the sliding ring, a plurality of third flow holes are equidistantly arranged on the circumference of the second fixing ring, and the second flow holes are staggered with the first flow holes and the third flow holes, respectively. The magnetic part includes a first permanent magnet arranged on the first fixing ring, a second permanent magnet arranged on the sliding ring, and a third permanent magnet arranged on the second fixing ring. The second permanent magnet attracts the first permanent magnet and repels the third permanent magnet.

[0010] Preferably, the pin assembly also includes two mounting frames arranged on both sides of the barrel, each mounting frame is provided with a row of pins, the two rows of pins are staggered and evenly distributed in the first thread segment and the third thread segment, the pin seal passes through the barrel and the tile lining, and is provided with an air inlet hole located in the inner cavity of the tile lining and an air outlet hole located outside the inner cavity from top to bottom, and the air inlet hole faces the direction of nitrogen entry.

[0011] Preferably, the air outlet of the pin located in the first thread segment faces the inlet direction of the reaction material, and the air outlet of the pin located in the third thread segment faces the outlet direction of the reaction material.

[0012] Preferably, the pin includes a sleeve and a center rod that are sealed and rotatably mounted. The bottom of the sleeve is sealed and rotatably connected to the mounting frame. The center rod is fixedly connected to the mounting frame. The side wall of the sleeve is provided with a circumferential long through hole and an air outlet. The side wall of the center rod is provided with an air inlet connected to the circumferential long through hole. The bottom is located above the air outlet and is axially provided with a center groove connected to the air inlet. A plurality of circumferential long through holes are equidistantly arranged around the circumference and the spacing between two adjacent circumferential long through holes is smaller than the diameter of the air inlet.

[0013] Preferably, the transmission mechanism includes a first bevel gear fixedly arranged on the main shaft, a second bevel gear meshing with the first bevel gear, the second bevel gear is fixedly connected to a rotating shaft, and the rotating shaft is transmission-connected to pins via a plurality of transmission belts.

[0014] The present invention provides a polymerization method of a para-aramid polymerization device, comprising the following steps: Step S100. Preparation of a mixed solvent: adding anhydrous calcium chloride to dehydrated N-methylpyrrolidone, stirring and mixing to obtain a mixed solvent, wherein the concentration of anhydrous calcium chloride in the mixed solvent is 5 to 10 wt %, and cooling the mixed solvent to 10 to 20° C.; Step S200. Preparation of p-phenylenediamine reaction solution: adding p-phenylenediamine to a mixed solvent, stirring and mixing to obtain a p-phenylenediamine reaction solution, wherein the concentration of p-phenylenediamine in the p-phenylenediamine reaction solution is 10 to 20 wt %; Step S300. Mixing the reaction monomers: extending the p-phenylenediamine atomizing nozzle from the PDD feed port into the prepolymer feed bin in a sealed manner, extending the terephthaloyl chloride atomizing nozzle from the TPC feed port into the prepolymer feed bin in a sealed manner, cooling the p-phenylenediamine reaction liquid to -5°C, and feeding it into the p-phenylenediamine atomizing nozzle through a metering pump, and at the same time feeding the molten terephthaloyl chloride into the terephthaloyl chloride atomizing nozzle through a metering pump, and obtaining a reaction material by atomizing and spraying the p-phenylenediamine reaction liquid and the terephthaloyl chloride, and controlling the molar ratio of p-phenylenediamine to terephthaloyl chloride to be 1: (1 to 1.03); Step S400. Prepolymerization reaction: low-temperature nitrogen is introduced into the tile lining and the main shaft in opposite directions through a nitrogen cooling circulation system, and the reaction material first enters the first thread section of the conical screw, and is subjected to high-speed shear dispersion in the first thread section. Part of the low-temperature nitrogen in the tile lining is sprayed into the reaction material through a pin, directly cooling the reaction material and promoting mixing and dispersion, so that the temperature of the material in this section is maintained at -5 to 5°C; in the second thread section, the sliding ring of the defoaming mechanism slides back and forth between the first fixed ring and the second fixed ring, and the large bubbles in the reaction material are quickly broken, and the centrifugal force generated by the rotation of the conical screw can be used to quickly discharge the waste gas containing HCl; the low-temperature nitrogen sprayed into the material from the pin in the third thread section can quickly cool the material while improving the dispersion efficiency, so that the temperature of the material in this section is maintained at 5 to 20°C, and the third thread section quickly transports the prepolymer with increased viscosity in the late stage of prepolymerization to the polymerization reactor; Step S500. Polymerization reaction: The prepolymer obtained from the reaction in the prepolymerization reactor enters the polymerization reactor for polymerization reaction, the stirring drive motor drives the stirring and crushing mechanism to stir and crush the reactants, the temperature control component controls the temperature of the polymerization reactor to maintain the polymerization temperature at 75-80°C, the waste gas containing HCl produced by the reaction flows out from the polymerization outlet, the polymerization product falls into the storage bin, and is discharged through a rotary discharge valve to obtain a powdered para-aramid resin.

[0015] Compared with the prior art, the present invention has the following beneficial technical effects: 1. Feeding through atomization and spraying promotes the mixing of reaction materials. A single screw reciprocating extruder structure with a pin and a conical screw is used. The equipment generates low heat during operation. The combination of the rotary shear mixing of the conical screw and the axial local countercurrent mixing of the material greatly improves the mixing and dispersion effect of the reaction materials. 2. A tile lining is set in the prepolymerization reactor to effectively protect the barrel. Low-temperature nitrogen is introduced into the tile lining, main shaft and pins, and the flow directions of ammonia in the tile lining and main shaft are opposite, which can perform triple strong cooling on the material, with good temperature control effect, greatly slowing down the polymerization speed, allowing the material to have more sufficient mixing time and improving the uniformity of dispersion; 3. The notches on the threads of the conical screw are not directly connected axially, which can avoid the formation of a through axial straight flow channel, thereby avoiding material residue; the thread width and pitch of the first thread section of the conical screw are the smallest, the threads are dense, and the shear strength matched with the tile lining and the pin is the largest, which can fully mix the materials when the viscosity of the materials is the lowest in the early stage of prepolymerization. The second thread section is provided with a defoaming mechanism, and a prepolymerization exhaust port is arranged above the second thread section, which can enable the HCl generated during the reaction and mixed in the reaction materials in the form of bubbles to be quickly discharged from the barrel, thereby extending the service life of the equipment; the thread width and pitch of the third thread section are the largest, and the threads are loose, which can quickly transport the prepolymer with increased viscosity in the late stage of prepolymerization to the polymerization reactor; 4. The defoaming mechanism is used in conjunction with the pin at the tail of the first thread segment and the pin at the head of the third thread segment. As the conical screw rotates continuously, the magnetic force of the pin and the magnetic part cooperates to make the sliding ring slide back and forth between the first fixed ring and the second fixed ring, repeatedly squeezing the material flowing through the defoaming mechanism to break the bubbles contained therein. The centrifugal force generated by the rotation of the conical screw can quickly discharge the waste gas containing HCl; 5. The pin is provided with an air inlet and an air outlet. Part of the low-temperature nitrogen flowing in the tile lining can directly enter the inner cavity of the pin from the air inlet, and then be sprayed into the material from the air outlet. This can not only greatly improve the cooling effect on the material, but also improve the mixing effect of the reaction materials under the action of the airflow. In addition, the nitrogen blown into the material can carry the HCl gas generated by the reaction and quickly discharge it from the material, reducing the corrosion to the equipment. 6. The pin is composed of a rotatable sleeve and a center rod. The sleeve rotates under the transmission of the transmission mechanism. The nitrogen in the shoe lining enters the air inlet from the circumferential long through hole of the sleeve, passes through the central cavity and finally flows into the material from the air outlet. Since the sleeve is in a rotating state, the nitrogen will also be sprayed into the material in a rotating state, further improving the material mixing and cooling effect; In summary, the para-aramid polymerization device provided by the present invention adopts atomization spraying mode to feed materials, and is equipped with a reciprocating extrusion mixing structure and a triple strong cooling structure, so as to achieve good temperature control effect, good mixing and dispersion effect of reaction materials, high exhaust efficiency of waste gas containing HCl, and obtain high-quality para-aramid resin. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of the present invention; Figure 2 is a top view of a prepolymerization reactor; Figure 3 It is a three-dimensional exploded view of a prepolymerization reactor; Figure 4 It is a schematic diagram of the structure of the pin assembly and the conical screw in operation; Figure 5 It is the front view of the tapered screw; Figure 6 It is a structural schematic diagram of the defoaming mechanism; Figure 7 This is a schematic diagram of the structure of the pin in Example 1.

[0017] Description of reference numerals: 1. Prepolymerization reactor, 11. Cylinder, 111. Prepolymerization feed bin, 1111. TPC feed port, 1112. PDD feed port, 1113. Bin gas outlet, 112. Prepolymerization gas outlet, 113. Prepolymerization outlet, 114. Sealing end cover, 115. First cryogenic nitrogen inlet pipe, 116. First cryogenic nitrogen outlet pipe, 117. Fixed ring, 118. Second cryogenic nitrogen inlet pipe, 119. Second low-temperature nitrogen outlet pipe, 12. Tiled lining, 13. Conical screw, 131. Main shaft, 132. Thread, 1321. First thread segment, 1322. Second thread segment, 1323. Third thread segment, 133. Notch, 14. Screw drive motor, 15. Pin assembly, 151. Pin, 1511. Sleeve, 1512. Center rod, 1513. Circumferential long through hole, 15 14. Air inlet, 1515. Air outlet, 1516. Center groove, 152. Mounting frame, 153. Transmission mechanism, 1531. First bevel gear, 1532. Second bevel gear, 1533. Rotating shaft, 1534. Transmission belt, 16. Defoaming mechanism, 161. First fixed ring, 1611. Sliding hole, 1612. First flow hole, 1613. First permanent magnet, 162. Sliding ring, 1621. Sliding shaft, 1622. Second flow hole, 1623. Second permanent magnet, 163. Second fixed ring, 1631. Third flow hole, 1632. Third permanent magnet, 2. Polymerization reactor, 21. Shell, 22. Feed inlet, 23. Polymerization air outlet, 24. Stirring drive motor, 25. Stirring and crushing mechanism, 26. Temperature control component, 27. Storage bin, 28. Rotary discharge valve. DETAILED DESCRIPTION

[0018] The specific implementation of the present invention is described below in conjunction with the accompanying drawings and embodiments: It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification so that people familiar with this technology can understand and read them, and are not used to limit the conditions under which the present invention can be implemented. Any structural modification, change in proportional relationship or adjustment of size should fall within the scope of the technical contents disclosed in the present invention without affecting the effects and purposes that can be achieved by the present invention.

[0019] At the same time, the terms such as "upper", "lower", "left", "right", "middle" and "one" cited in this specification are only for the convenience of description and are not used to limit the scope of implementation of the present invention. Changes or adjustments to their relative relationships should be regarded as the scope of implementation of the present invention without substantially changing the technical content. Example 1

[0020] Combined with Figure 1-7The present embodiment provides a para-aramid polymerization device, comprising a prepolymerization reactor 1 and a polymerization reactor 2 connected to each other, wherein the prepolymerization reactor 1 comprises a horizontally arranged barrel 11, wherein the inner wall of the barrel 11 is fitted with a tile lining 12, a conical screw 13 is arranged inside, and a screw drive motor 14 and a pin assembly 15 are arranged outside, wherein the pin assembly 15 comprises a plurality of pins 151 arranged axially along the barrel 11, wherein the pins 151 seal through the barrel 11 and the tile lining 12 and then abut against a main shaft 131 of the conical screw 13, wherein a notch 133 for the pins 151 to pass through is arranged on a thread 132 of the conical screw 13, wherein the tile lining 12, the main shaft 131 and the pins 151 are all hollow structures and are all connected to a nitrogen cooling circulation system, and the nitrogen flow directions in the tile lining 12 and the main shaft 131 are opposite. In the above technical solution, the pin assembly 15 and the conical screw 13 constitute a single-screw reciprocating extruder structure, and the pin 151 is radially inserted into the thread groove of the conical screw 13 from the circumferential direction of the barrel 11. When the conical screw 13 rotates, the material is conveyed in the discharge direction. The conical screw 13 cooperates with the tile lining 12 and the pin 15 to perform double shearing and stirring on the material. The notch 133 on the thread 132 can cause a small axial reflux of the material flow, further improving the mixing and dispersion effect of the material. Since the conical screw 13 has a greater propulsion effect on the material than a reflux effect, the material is generally still in the discharge direction. Conveying, compared with the traditional single-screw or twin-screw extruder, the single-screw reciprocating extruder has better shear mixing effect and lower heat generation; the shoe lining 12 is made of wear-resistant material, the outer ring wall is a circle that fits the inner wall of the barrel 11, and the inner ring wall is a cone that fits the thread 132 of the conical screw 13. Low-temperature nitrogen is introduced into the shoe lining 12, the main shaft 131 and the pin 151 to perform triple strong cooling on the material, with good temperature control effect, greatly slowing down the polymerization speed, and allowing the material to have more sufficient mixing time. The ammonia flow directions in the shoe lining 12 and the main shaft 131 are opposite, which can further improve the cooling effect.

[0021] Figure 1 The flow state of the cryogenic nitrogen in this embodiment is shown in FIG. Figure 1 and Figure 3A first cryogenic nitrogen gas inlet pipe 115 communicating with the tile lining 12 and a second cryogenic nitrogen gas outlet pipe 119 communicating with the main shaft 131 are provided near the material outlet of the barrel 11. A first cryogenic nitrogen gas outlet pipe 116 communicating with the tile lining 12 is provided near the material inlet. A fixed ring 117 sealingly and rotatably sleeved with the main shaft 131 is provided at the material inlet end of the barrel 11. An annular groove is provided on the inner ring surface of the fixed ring 117. A radial hole communicating with the annular groove is provided on the main shaft 131. A second cryogenic nitrogen gas inlet pipe 118 is provided on the fixed ring 117. The low-temperature nitrogen in the nitrogen cooling circulation system enters the inner cavity of the tile lining 12 from the first low-temperature nitrogen inlet pipe 115, flows in the opposite direction of the material flow direction, and finally flows back to the nitrogen cooling circulation system from the first low-temperature nitrogen outlet pipe 116. At the same time, the low-temperature nitrogen in the nitrogen cooling circulation system enters the inner cavity of the main shaft 131 from the second low-temperature nitrogen inlet pipe 118, flows in the material flow direction, and finally flows back to the nitrogen cooling circulation system from the second low-temperature nitrogen inlet pipe 118. Similarly, the flow direction of the low-temperature nitrogen in the tile lining 12 and the main shaft 131 in the present invention can also be opposite to the aforementioned direction, as long as a convection state can be formed.

[0022] In a specific technical scheme, the inner cavity of the tile lining 12 is a conical cavity that gradually contracts toward the material inlet, and the inner cavity of the main shaft 131 is a conical cavity that gradually contracts toward the material outlet. The two opposite conical cavities have a larger volume and can further improve the cooling effect. The barrel 11 is cylindrical, and is provided with a prepolymerization feed bin 111, a prepolymerization air outlet 112 and a prepolymerization outlet 113 in sequence along the direction of material flow. The side walls of the prepolymerization feed bin 111 are relatively provided with a TPC feed port 1111 and a PDD feed port 1112, and a bin air outlet 1113 is provided on the top. The prepolymerization outlet 113 is connected to the feed port 22 of the polymerization reactor 2. The barrel 11 is open at one end close to the prepolymerization feed bin 111, and a sealing end cover 114 is provided at the opening. The tile lining 12 is provided with through holes corresponding to the prepolymerization feed bin 111, the prepolymerization air outlet 112 and the prepolymerization outlet 113. In the above technical scheme, TPC and PDD enter the prepolymerization feed silo 111 from the TPC feed port 1111 and the PDD feed port 1112 by atomizing spraying, and the prepolymerization gas outlet 112 and the silo gas outlet 1113 can discharge the waste gas containing HCl in time; the sealing end cover 114 facilitates the installation and maintenance of the tile lining 12 and the conical screw 13.

[0023] In a specific technical solution, the polymerization reactor 2 includes a vertically arranged shell 21, the top of which is provided with a feed inlet 22, a polymerization outlet 23 and a stirring drive motor 24, a stirring and crushing mechanism 25 connected to the stirring drive motor 24 is arranged inside, a temperature control component 26 is fitted on the outer wall, a conical storage bin 27 is arranged at the bottom, and a rotary discharge valve 28 is arranged at the bottom of the storage bin 27. In the above technical solution, the stirring and crushing mechanism 25 can be a single screw, a twin screw or any other suitable stirring and crushing structure, which can stir and crush the material to form a polymer product in powder form; the temperature control component 26 includes but is not limited to a traditional temperature control coil or a temperature control structure that directly blows nitrogen into the shell 21.

[0024] In a specific technical solution, the thread 132 is divided into a first thread segment 1321, a second thread segment 1322 and a third thread segment 1323 along the material flow direction, wherein the thread width and pitch are both increased, the first thread segment 1321 and the third thread segment 1323 cooperate with the pin 151, and are provided with corresponding notches 133, the notches 133 are staggered and not directly connected in the axial direction, the second thread segment 1322 is located directly below the pre-polymerization outlet 112, and a defoaming mechanism 16 is provided in a mirror image at both ends of the axial direction. In the above technical solution, the axial length ratio of the first thread segment 1321, the second thread segment 1322 and the third thread segment 1323 is preferably 1: (1 / 3 to 1 / 6): (1 to 2). The notches 133 are not directly connected in the axial direction, which can avoid the formation of a through axial straight flow channel, thereby avoiding material residue. The first thread segment 1321 has the smallest thread width and pitch, and the thread 132 of this segment is dense, and the shear strength matched with the tile lining 12 and the pin 151 is the largest, so that the materials can be fully mixed and evenly mixed when the viscosity of the materials is the smallest in the initial stage of prepolymerization. The second thread segment 1322 is located directly below the prepolymerization outlet 112, and is matched with the defoaming mechanism 16, so that HCl generated during the reaction and mixed in the reaction materials in the form of bubbles can be quickly discharged; the third thread segment 1323 has the largest thread width and pitch, and the thread 132 of this segment is loose, so that the prepolymer with increased viscosity in the later stage of prepolymerization can be quickly transported to the polymerization reactor 2.

[0025] In a specific technical solution, the defoaming mechanism 16 includes a first fixed ring 161, a sliding ring 162 and a second fixed ring 163 arranged axially in sequence, and a magnetic member that makes the sliding ring 162 close to the first fixed ring 161. The first fixed ring 161 is close to the pin 151 at the first thread segment 1321 or the third thread segment 1323, and a plurality of sliding holes 1611 are equidistantly arranged on the axial circumference. The sliding ring 162 is provided with a plurality of sliding shafts 1621 that cooperate with the sliding holes 1611. The free end of the sliding shaft 1621 can extend out of the sliding hole 1611 and can slide under the push of the pin 151, so that the sliding ring 162 is close to the second fixed ring 163. In the above technical solution, the bubble removal mechanism 16 is used in conjunction with the pin 151 at the tail of the first threaded segment 1321 and the pin 151 at the head of the third threaded segment 1323. The first fixed ring 161, the sliding ring 162 and the second fixed ring 163 can ensure the normal flow of materials by means of a flow gap between the tile liner 12, a flow groove on the outer ring surface or a flow hole in the axial direction. In the initial state, the sliding ring 162 is tightly attached to the first fixed ring 161 under the magnetic force of the magnetic part. At this time, the free end of the sliding shaft 1621 extends the sliding hole 1611. When the conical screw 13 rotates, the pin 151 contacts the free end of the sliding shaft 1621, generating an axial thrust on the sliding shaft 1621, so that The sliding ring 162 overcomes the magnetic force of the magnetic part, approaches and clings to the second fixed ring 163. When the pin 151 moves away from the free end of the sliding shaft 1621 as the conical screw 13 rotates, the axial thrust of the pin 151 on the sliding shaft 1621 disappears. Under the magnetic force of the magnetic part, the sliding ring 162 is reset and clings to the first fixed ring 161. As the conical screw 13 continues to rotate, the magnetic forces of the pin 151 and the magnetic part cooperate to make the sliding ring 162 slide back and forth between the first fixed ring 161 and the second fixed ring 163, repeatedly squeezing the material flowing through the defoaming mechanism 16 to break the bubbles contained therein. Combined with the centrifugal force generated by the rotation of the conical screw 13, the waste gas containing HCl can be quickly discharged.

[0026] In a specific technical solution, the free end of the sliding shaft 1621 is a spherical surface, a plurality of first flow holes 1612 are equidistantly arranged on the circumference of the first fixing ring 161, a plurality of second flow holes 1622 are equidistantly arranged on the circumference of the sliding ring 162, a plurality of third flow holes 1631 are equidistantly arranged on the circumference of the second fixing ring 163, the second flow holes 1622 are staggered with the first flow holes 1612 and the third flow holes 1631, respectively, the magnetic member includes a first permanent magnet 1613 arranged on the first fixing ring 161, a second permanent magnet 1623 arranged on the sliding ring 162 and a third permanent magnet 1632 arranged on the second fixing ring 163, the second permanent magnet 1623 is attracted to the first permanent magnet 1613 and repels the third permanent magnet 1632. In the above technical solution, the free end of the sliding shaft 1621 is a spherical surface, which can better cooperate with the pin 151. Of course, the free end can also adopt a wedge surface that cooperates with the pin 151, and the wedge surface can increase the maximum axial displacement of the sliding shaft 1621; the second flow hole 1622 is staggered with the first flow hole 1612 and the third flow hole 1631, respectively, which can avoid the material from generating axial through flow channels between the sliding ring 162 and the first fixed ring 161 and between the sliding ring 162 and the second fixed ring 163, affecting the defoaming effect; the second permanent magnet 1623 on the sliding ring 162 is attracted to the first permanent magnet 1613 on the first fixed ring 161, and repels the third permanent magnet 1632 on the second fixed ring 163, which can enhance the magnetic effect.

[0027] In a specific technical solution, the pin assembly 15 also includes two mounting frames 152 arranged on both sides of the barrel 11, each mounting frame 152 is provided with a row of pins 151, the two rows of pins 151 are staggered and evenly distributed in the first thread segment 1321 and the third thread segment 1323, the pins 151 seal through the barrel 11 and the tile lining 12, and are provided with an air inlet hole 1514 located in the inner cavity of the tile lining 12 and an air outlet hole 1515 located outside the inner cavity from top to bottom, and the air inlet hole 1514 faces the direction of nitrogen entry. In the above technical solution, part of the low-temperature nitrogen flowing in the tile lining 12 can be directly sprayed into the material from the pin 151, which can greatly improve the cooling effect on the material on the one hand, and on the other hand, the nitrogen blown into the material can quickly mix with the gaseous HCl generated by the reaction to form large bubbles, and the centrifugal force generated by the rotation of the conical screw 13 can be used to carry the HCl gas and quickly discharge it from the material, reducing the corrosion to the equipment. The air inlet 1514 faces the direction of nitrogen inlet, which can promote the flow of nitrogen into the pin 151. In addition, in order to further improve the air intake effect of the pin 151, as shown in FIG. Figure 1 As shown, the nitrogen flow direction in the tapered cavity of the tile lining 12 is preferably from the large diameter end of the tapered cavity to the small diameter end. Figure 1The single dashed arrow in the middle represents the flow direction of nitrogen, the double dashed arrow represents the flow direction of the waste gas containing nitrogen and HCl, and the solid arrow represents the flow direction of the material.

[0028] In a specific technical solution, the pin 151 includes a sleeve 1511 and a center rod 1512 that are sealed and rotatably sleeved. The bottom of the sleeve 1511 is sealed and rotatably connected to the mounting frame 152. The center rod 1512 is fixedly connected to the mounting frame 152. The side wall of the sleeve 1511 is provided with a circumferential long through hole 1513 and an air outlet 1515. The side wall of the center rod 1512 is provided with an air inlet 1514 connected to the circumferential long through hole 1513. The bottom is located above the air outlet 1515 and is axially provided with a center groove 1516 connected to the air inlet 1514. The circumferential long through hole 1513 is equidistantly provided with multiple circumferential long through holes 1513 and the spacing between two adjacent circumferential long through holes 1513 is less than the diameter of the air inlet hole 1514. The sleeve 1511 is connected to the main shaft 131 through a transmission mechanism 153 and rotates with the main shaft 131. In the above technical solution, the sleeve 1511 rotates under the transmission action of the transmission mechanism 153, and the nitrogen in the shoe lining 12 enters the air inlet 1514 from the circumferential long through hole 1513 of the sleeve 1511, passes through the central groove 1516 and finally flows into the material from the air outlet 1515. Since the sleeve 1511 is in a rotating state, the nitrogen will also be sprayed into the material in a rotating state, further improving the material mixing and cooling effect.

[0029] In a specific technical solution, the transmission mechanism 153 includes a first bevel gear 1531 fixedly arranged on the main shaft 131, a second bevel gear 1532 meshing with the first bevel gear 1531, the second bevel gear 1532 is fixedly connected to a rotating shaft 1533, and the rotating shaft 1533 is transmission-connected to the pin 151 through a plurality of transmission belts 1534. The transmission mechanism 153 in the present invention may adopt any other suitable structure.

[0030] The working principle and working process of this embodiment are as follows: the nitrogen cooling circulation system respectively passes low-temperature nitrogen into the tile lining 12, the main shaft 131 and the pin 151 of the prepolymerization reactor 1, starts the motor 14, and the conical screw 13 starts to rotate. The two reaction materials are mixed in the prepolymerization feed bin 111 in an atomized spraying manner. The conical screw 13 cooperates with the tile lining 12 and the pin 151 to perform rapid and high-intensity shear dispersion and cooling of the reaction materials. The first thread section 132 of the conical screw 13 1 has the largest shear strength, the best stirring and dispersing effect, and at the same time, with the low-temperature nitrogen sprayed into the material from the pin 151, the material in the early stage of pre-polymerization can be quickly mixed and dispersed evenly, and keep the low temperature state to flow to the second thread segment 1322, the second thread segment 1322 is located directly below the pre-polymerization outlet 112, and is provided with a defoaming mechanism 16, the sliding ring 162 of the defoaming mechanism 16 reciprocates between the first fixed ring 161 and the second fixed ring 163, and repeatedly squeezes the material flowing through the defoaming mechanism 16 The pressure is applied to break the bubbles contained therein, and the centrifugal force generated by the rotation of the conical screw 13 can quickly discharge the waste gas containing HCl and then flow to the third thread segment 1323. The low-temperature nitrogen injected into the material from the pin 151 in the third thread segment 1323 can quickly cool the material while improving the dispersion efficiency, so as to avoid the material from accelerating the reaction speed due to excessive heat generation in the late stage of the prepolymerization reaction. In addition, the third thread segment 1323 has high conveying efficiency and can quickly convey the prepolymer with increased viscosity in the late stage of the prepolymerization reaction to the polymerization reactor 2; the prepolymer obtained from the reaction in the prepolymerization reactor 1 enters the polymerization reactor 2 for polymerization reaction, the stirring drive motor 24 drives the stirring and crushing mechanism 25 to stir and crush the reactants, the temperature control component 26 heats the polymerization reactor 2 to keep it at the polymerization temperature, the waste gas containing HCl generated by the reaction flows out from the polymerization outlet 23, and the polymerization product falls into the storage bin 27, and is discharged by rotating the discharge valve 28 to obtain a powdered para-aramid resin. Example 2

[0031] This embodiment provides a para-aramid polymer paper, in which the pin 151 in the pin assembly 15 in the embodiment 1 is designed as a fixed structure, and the remaining structures are the same as those in the embodiment 1. The specific technical scheme is as follows: The pin assembly 15 also includes two mounting frames 152 arranged on both sides of the barrel 11, each mounting frame 152 is provided with a row of pins 151, the two rows of pins 151 are staggered and evenly distributed in the first thread segment 1321 and the third thread segment 1323, the pins 151 seal through the barrel 11 and the tile lining 12, and are provided with an air inlet hole 1514 located in the conical cavity of the tile lining 12 and an air outlet hole 1515 located outside the conical cavity from top to bottom, and the air inlet hole 1514 faces the direction of nitrogen entry.

[0032] The air outlet 1515 of the pin 151 in the first thread segment 1321 faces the inlet direction of the reaction material, and the air outlet 1515 of the pin 151 in the third thread segment 1323 faces the outlet direction of the reaction material.

[0033] In this embodiment, the air outlet 1515 of the pin 151 located in the first thread segment 1321 faces the inlet direction of the reaction material, which can enhance the axial counterflow effect of the reaction material, increase the residence time of the reaction material in the first thread segment 1321, and improve the mixing effect of the reaction material in the initial stage of prepolymerization; the air outlet 1515 of the pin 151 located in the second thread segment 1322 faces the outlet direction of the reaction material, which can improve the discharge speed of the reaction material in the later stage of prepolymerization. Example 3

[0034] Combined with Figure 1-7 This embodiment provides a polymerization method of a para-aramid polymerization device, comprising the following steps: Step S100. Preparation of a mixed solvent: adding anhydrous calcium chloride to dehydrated N-methylpyrrolidone, stirring and mixing to obtain a mixed solvent, wherein the concentration of anhydrous calcium chloride in the mixed solvent is 5 to 10 wt %, and cooling the mixed solvent to 10 to 20° C.; Step S200. Preparation of p-phenylenediamine reaction solution: adding p-phenylenediamine to a mixed solvent, stirring and mixing to obtain a p-phenylenediamine reaction solution, wherein the concentration of p-phenylenediamine in the p-phenylenediamine reaction solution is 10 to 20 wt %; Step S300. Mixing the reaction monomers: extending the p-phenylenediamine atomizing nozzle from the PDD feed port 1112 into the prepolymer feed bin 111 in a sealed manner, extending the terephthaloyl chloride atomizing nozzle from the TPC feed port 1111 into the prepolymer feed bin 111 in a sealed manner, cooling the p-phenylenediamine reaction liquid to -5°C, and feeding it into the p-phenylenediamine atomizing nozzle through a metering pump, and at the same time feeding the molten terephthaloyl chloride into the terephthaloyl chloride atomizing nozzle through a metering pump, and obtaining the reaction material by atomizing and spraying the p-phenylenediamine reaction liquid and the terephthaloyl chloride, and controlling the molar ratio of p-phenylenediamine to terephthaloyl chloride to be 1: (1 to 1.03); Step S400. Prepolymerization reaction: low-temperature nitrogen is introduced into the tile lining 12 and the main shaft 131 in opposite directions through the nitrogen cooling circulation system, and the reaction material first enters the first thread section 1321 of the conical screw 13, and is sheared and dispersed at a high speed in the first thread section 1321. Part of the low-temperature nitrogen in the tile lining 12 is sprayed into the reaction material through the pin 151, directly cooling the reaction material and promoting mixing and dispersion, so that the temperature of this section of the material is maintained at -5 to 5°C; in the second thread section 1322, the sliding ring 162 of the defoaming mechanism 16 reciprocates between the first fixed ring 161 and the second fixed ring 163, and the defoaming mechanism 16 flows through the first thread section 1321. The reaction material is repeatedly squeezed. Since the reaction material contains a large amount of nitrogen, the nitrogen can quickly mix with the gaseous HCl generated by the reaction to form large bubbles. Under the repeated squeezing of the defoaming mechanism 16, the large bubbles inside the reaction material are quickly broken, and the centrifugal force generated by the rotation of the conical screw 13 can quickly discharge the waste gas containing HCl; the low-temperature nitrogen sprayed into the material from the pin 151 in the third thread segment 1323 can quickly cool the material while improving the dispersion efficiency, so that the temperature of the material in this section is maintained at 5-20°C. The third thread segment 1323 has a high conveying efficiency and can quickly convey the prepolymer with increased viscosity in the late stage of prepolymerization to the polymerization reactor 2; Step S500. Polymerization reaction: The prepolymer obtained from the reaction in the prepolymerization reactor 1 enters the polymerization reactor 2 for polymerization reaction, the stirring drive motor 24 drives the stirring and crushing mechanism 25 to stir and crush the reactants, the temperature control component 26 controls the temperature of the polymerization reactor 2 to maintain the polymerization temperature at 75-80°C, the waste gas containing HCl produced by the reaction flows out from the polymerization outlet 23, the polymerization product falls into the storage bin 27, and is discharged by rotating the discharge valve 28 to obtain a powdered para-aramid resin.

[0035] The above embodiments are preferred implementation modes of the present invention, but the implementation modes of the present invention are not limited to the above embodiments. Any other changes, modifications, substitutions, combinations, and simplifications made without departing from the spirit and principles of the present invention shall be equivalent replacement modes and shall be included in the protection scope of the present invention.

Claims

1. A para-aramid polymerization device, comprising a prepolymerization reactor (1) and a polymerization reactor (2) connected to each other, characterized in that: The prepolymerization reactor (1) comprises a horizontally arranged barrel (11), the inner wall of which is fitted with a shoe lining (12), a conical screw (13) is arranged inside, and a screw drive motor (14) and a pin assembly (15) are arranged outside. The pin assembly (15) comprises a plurality of pins (151) arranged along the axial direction of the barrel (11), the pins (151) sealably pass through the barrel (11) and the shoe lining (12) and then abut against a main shaft (131) of the conical screw (13), a notch (133) for the pins (151) to pass through is provided on the thread (132) of the conical screw (13), the shoe lining (12), the main shaft (131) and the pins (151) are all hollow structures and are all connected to a nitrogen cooling circulation system, and the nitrogen flows in the shoe lining (12) and the main shaft (131) in opposite directions.

2. The para-aramid polymerization device according to claim 1, characterized in that: The inner cavity of the tile lining (12) is a conical cavity that gradually contracts toward the material inlet direction; the inner cavity of the main shaft (131) is a conical cavity that gradually contracts toward the material outlet direction; the barrel (11) is cylindrical and is provided with a prepolymerization feed bin (111), a prepolymerization gas outlet (112) and a prepolymerization discharge port (113) in sequence along the material flow direction; the side walls of the prepolymerization feed bin (111) are provided with a TPC feed port (1111) and a PDD feed port (1112) opposite to each other; the top is provided with a bin gas outlet (1113); the prepolymerization discharge port (113) is communicated with the feed port (22) of the polymerization reactor (2); the barrel (11) is close to the prepolymerization feed bin (111 ) is open at one end, a sealing end cap (114) is provided at the opening, and through holes corresponding to the prepolymerization feed bin (111), the prepolymerization gas outlet (112) and the prepolymerization discharge port (113) are provided on the tile lining layer (12); the polymerization reactor (2) comprises a vertically arranged shell (21), the top of which is provided with a feed port (22), a polymerization gas outlet (23) and a stirring drive motor (24), an interior of which is provided with a stirring and crushing mechanism (25) connected to the stirring drive motor (24), an outer wall of which is provided with a temperature control component (26), a bottom of which is provided with a conical storage bin (27), and a bottom of which is provided with a rotary discharge valve (28).

3. The para-aramid polymerization device according to claim 2, characterized in that: The thread (132) is divided into a first thread segment (1321), a second thread segment (1322) and a third thread segment (1323) along the material flow direction, wherein the thread width and pitch both increase progressively. The first thread segment (1321) and the third thread segment (1323) cooperate with the pin (151) and are provided with corresponding notches (133). The notches (133) are arranged in a staggered manner and are not directly connected in the axial direction. The second thread segment (1322) is located directly below the pre-polymerization outlet (112), and a defoaming mechanism (16) is provided at both ends of the axial direction in a mirror-like manner.

4. The para-aramid polymerization device according to claim 3, characterized in that: The defoaming mechanism (16) comprises a first fixed ring (161), a sliding ring (162) and a second fixed ring (163) which are arranged in sequence in the axial direction, and a magnetic member which enables the sliding ring (162) to be in close contact with the first fixed ring (161); the first fixed ring (161) is provided with a plurality of sliding holes (1611) equidistantly arranged on the axial circumference of a pin (151) close to the first threaded section (1321) or the third threaded section (1323); the sliding ring (162) is provided with a plurality of sliding shafts (1621) which match the sliding holes (1611); the free ends of the sliding shafts (1621) are capable of extending out of the sliding holes (1611) and of sliding under the pushing of the pin (151), so that the sliding ring (162) is in close contact with the second fixed ring (163).

5. The para-aramid polymerization device according to claim 4, characterized in that: The free end of the sliding shaft (1621) is a spherical surface; a plurality of first flow holes (1612) are equidistantly arranged on the circumference of the first fixing ring (161); a plurality of second flow holes (1622) are equidistantly arranged on the circumference of the sliding ring (162); a plurality of third flow holes (1631) are equidistantly arranged on the circumference of the second fixing ring (163); the second flow holes (1622) are staggered with the first flow holes (1612) and the third flow holes (1631), respectively; the magnetic component comprises a first permanent magnet (1613) arranged on the first fixing ring (161), a second permanent magnet (1623) arranged on the sliding ring (162), and a third permanent magnet (1632) arranged on the second fixing ring (163); the second permanent magnet (1623) is attracted to the first permanent magnet (1613) and repels the third permanent magnet (1632).

6. The para-aramid polymerization device according to claim 5, characterized in that: The pin assembly (15) further comprises two mounting frames (152) arranged on both sides of the barrel (11), each mounting frame (152) being provided with a row of pins (151), the two rows of pins (151) being arranged in a staggered manner and evenly distributed in the first threaded section (1321) and the third threaded section (1323), the pins (151) passing through the barrel (11) and the shoe lining (12) in a sealed manner, and being provided with an air inlet hole (1514) located in the inner cavity of the shoe lining (12) and an air outlet hole (1515) located outside the inner cavity in sequence from top to bottom, the air inlet hole (1514) facing the direction in which nitrogen enters.

7. The para-aramid polymerization device according to claim 6, characterized in that: The air outlet (1515) of the pin (151) located in the first thread segment (1321) faces the inlet direction of the reaction material, and the air outlet (1515) of the pin (151) located in the third thread segment (1323) faces the outlet direction of the reaction material.

8. The para-aramid polymerization device according to claim 6, characterized in that: The pin (151) comprises a sleeve (1511) which is rotatably sleeved in a sealed manner and a center rod (1512); the sleeve (1511) has a sealed bottom and is rotatably connected to the mounting frame (152); the center rod (1512) is fixedly connected to the mounting frame (152); a circumferentially long through hole (1513) and an air outlet (1515) are provided on a side wall of the sleeve (1511); and a circumferentially long through hole (1513) and an air outlet (1515) are provided on a side wall of the center rod (1512). ) is connected to the air inlet hole (1514), the bottom is located above the air outlet hole (1515) and is axially provided with a center groove (1516) connected to the air inlet hole (1514), a plurality of circumferential long through holes (1513) are equidistantly provided around the circumference and the spacing between two adjacent circumferential long through holes (1513) is smaller than the diameter of the air inlet hole (1514), and the sleeve (1511) is connected to the main shaft (131) through a transmission mechanism (153) and rotates with the main shaft (131).

9. The para-aramid polymerization device according to claim 8, characterized in that: The transmission mechanism (153) comprises a first bevel gear (1531) fixedly mounted on the main shaft (131), a second bevel gear (1532) meshing with the first bevel gear (1531), the second bevel gear (1532) being fixedly connected to a rotating shaft (1533), and the rotating shaft (1533) being transmission-connected to the pin (151) via a plurality of transmission belts (1534).

10. The polymerization method of a para-aramid polymerization device according to claim 9, characterized in that: The following steps are involved: Step S100. Preparation of a mixed solvent: adding anhydrous calcium chloride to dehydrated N-methylpyrrolidone, stirring and mixing to obtain a mixed solvent, wherein the concentration of anhydrous calcium chloride in the mixed solvent is 5 to 10 wt %, and cooling the mixed solvent to 10 to 20° C.; Step S200. Preparation of p-phenylenediamine reaction solution: adding p-phenylenediamine to a mixed solvent, stirring and mixing to obtain a p-phenylenediamine reaction solution, wherein the concentration of p-phenylenediamine in the p-phenylenediamine reaction solution is 10 to 20 wt %; Step S300. Mixing the reaction monomers: a p-phenylenediamine atomizing nozzle is sealed and extended from the PDD feed port (1112) into the prepolymer feed bin (111), and a terephthaloyl chloride atomizing nozzle is sealed and extended from the TPC feed port (1111) into the prepolymer feed bin (111), the p-phenylenediamine reaction liquid is cooled to -5°C and fed into the p-phenylenediamine atomizing nozzle through a metering pump, and molten terephthaloyl chloride is fed into the terephthaloyl chloride atomizing nozzle through a metering pump at the same time, and a reaction material is obtained by atomizing and spraying the p-phenylenediamine reaction liquid and terephthaloyl chloride, and the molar ratio of p-phenylenediamine to terephthaloyl chloride is controlled to be 1: (1 to 1.03); Step S400. Prepolymerization reaction: low-temperature nitrogen is introduced into the tile lining (12) and the main shaft (131) in opposite directions through a nitrogen cooling circulation system, and the reaction material first enters the first thread section (1321) of the conical screw (13), and is subjected to high-speed shear dispersion in the first thread section (1321). Part of the low-temperature nitrogen in the tile lining (12) is sprayed into the reaction material through the pin (151), directly cooling the reaction material and promoting mixing and dispersion, so that the temperature of the material in this section is maintained at -5 to 5°C; in the second thread section (1322), the defoaming mechanism (16) The sliding ring (162) slides back and forth between the first fixed ring (161) and the second fixed ring (163), and large bubbles in the reaction material are quickly broken. The waste gas containing HCl can be quickly discharged in combination with the centrifugal force generated by the rotation of the conical screw (13). The low-temperature nitrogen gas sprayed into the material from the pin (151) in the third thread segment (1323) can improve the dispersion efficiency and quickly cool the material, so that the temperature of the material in this segment is maintained at 5 to 20° C. The third thread segment (1323) quickly transports the prepolymer with increased viscosity in the late stage of prepolymerization to the polymerization reactor (2). Step S500. Polymerization reaction: The prepolymer obtained from the reaction in the prepolymerization reactor (1) enters the polymerization reactor (2) for polymerization reaction, the stirring drive motor (24) drives the stirring and crushing mechanism (25) to stir and crush the reactants, the temperature control component (26) controls the temperature of the polymerization reactor (2) to maintain the polymerization temperature at 75 to 80° C. The waste gas containing HCl generated by the reaction flows out from the polymerization outlet (23), and the polymerization product falls into the storage bin (27) and is discharged through the rotary discharge valve (28) to obtain a powdered para-aramid resin.

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