A polymerization apparatus for high viscosity polymers

Abstract

The present application relates to a kind of polymerization device of high viscosity polymer, belong to polymerization reaction device technical field.The present application includes reaction main body, with reaction inner cavity, reaction inner cavity is equipped with even root for stirring high viscosity polymer's helical stirring shaft, helical stirring shaft includes main shaft and the helical blade connected in the outer side of main shaft, and the helical blade in each adjacent two helical stirring shafts is staggered with each other on the side of mutual approach;Main shaft is equipped with the heat-conducting medium passage that is penetrated from top to bottom, and the heat-conducting medium passage in each main shaft is connected by connecting short pipe to be connected to be the serpentine heat-conducting medium circulation total passage, one end of heat-conducting medium circulation total passage is heat-conducting medium inlet, and the other end is heat-conducting medium outlet, and heat-conducting medium inlet and heat-conducting medium outlet are located in the same end of the reaction main body;Reaction main body outer side is equipped with heating box, and heating box is used to heat heat-conducting medium, and heating box is located in the side close to heat-conducting medium inlet and heat-conducting medium outlet.

Description

Technical Field

[0001] This invention relates to the field of polymerization reaction generating apparatus, and more particularly to a polymerization apparatus for high-viscosity polymers. Background Technology

[0002] Polymerization is the process of converting low molecular weight monomers into high molecular weight polymers. In the later stages of polymerization, the viscosity of the polymer melt increases, the fluidity of the material in the polymerization reactor decreases, and the resulting polymer is difficult to discharge from the polymerization reactor. A large amount of polymer adheres to the stirring shaft and stirring blades, which is difficult to clean.

[0003] To address these issues, interlocking helical blades are used to agitate the polymer. For example, a twin-screw polymerization reactor disclosed in patent CN208512567U includes a cylindrical body, an upper end cap at the top of the body, and a lower end cap at the bottom. A main agitator is located at the upper end of the upper end cap, and the agitator shaft extends through the upper end cap into the inner cavity of the cylindrical body. Two auxiliary motors drive corresponding rotating shafts, causing helical blades at different positions to rotate, forming a clearance fit with the helical blades on the agitator shaft. In this patent, the helical blades, while agitating the material, can also push the material upwards or downwards, serving a conveying function and facilitating the discharge of viscous materials from the cylindrical body. Furthermore, adjacent helical blades can scrape off viscous materials from each other during rotation, providing a certain degree of self-cleaning.

[0004] However, the polymerization reaction requires suitable temperature conditions to proceed fully. The aforementioned patent lacks heating equipment, making it difficult to create a suitable temperature environment for the polymerization reaction. In the prior art, heat-conducting media are often used to heat the inner cavity of the reactor. For example, a polymer material polymerization device disclosed in patent application publication number CN115282905A includes a reaction body, a sealing drive assembly, and a transmission stirring assembly. The reaction body is a hollow cavity with a partition on the outer wall of the reaction body to inject heat-conducting media into the outer wall of the reaction body. A heat-conducting media inlet is provided on one side of the bottom of the reaction body, and the heat-conducting media is injected from bottom to top, allowing the heat-conducting media to rise slowly. A heat-conducting media outlet is provided on the upper side wall of the reaction body to facilitate the thermal circulation of the heat-conducting media.

[0005] This patent introduces a heat-conducting medium into the partition to heat the inner cavity of the reaction body. A heat-conducting medium inlet is located at the bottom of the reaction body, and a heat-conducting medium outlet is located at the top to achieve circulation. However, this circulation method requires a heating box and circulation pipelines to be installed outside the reaction body. The heat-conducting medium flows out of the partition, enters the heating box through the circulation pipeline, and then flows back to the heat-conducting medium inlet to enter the partition again, thus achieving circulation. As the heat-conducting medium flows through the circulation pipeline, its heat is lost, resulting in a lower temperature when the heat-conducting medium flows back to the heating box. The heating box requires a longer time to heat the heat-conducting medium to the set temperature, and the temperature of the heat-conducting medium entering the partition is lower than the temperature when it flows out of the heating box. This reduces the heating efficiency of the inner cavity of the reaction body and affects the polymerization reaction. Summary of the Invention

[0006] This invention provides a polymerization apparatus for high-viscosity polymers to solve the technical problem of significant heat loss of the heat-conducting medium during the cyclic heating of the polymerization reactor in the prior art.

[0007] To solve the above problems, the present invention provides a polymerization apparatus for high-viscosity polymers, which adopts the following technical solution:

[0008] A polymerization apparatus for a high-viscosity polymer, comprising:

[0009] The reaction body has a reaction cavity, in which an even number of spiral stirring shafts for stirring high-viscosity polymers are provided. The spiral stirring shaft includes a main shaft and spiral blades connected to the outside of the main shaft. The spiral blades of each pair of adjacent spiral stirring shafts are staggered on the side closest to each other.

[0010] The main shaft is provided with a heat-conducting medium channel running vertically through it. The heat-conducting medium channels in each main shaft are connected by connecting short pipes to form a serpentine heat-conducting medium circulation channel. One end of the heat-conducting medium circulation channel is the heat-conducting medium inlet, and the other end is the heat-conducting medium outlet. The heat-conducting medium inlet and the heat-conducting medium outlet are located at the same end of the reaction body.

[0011] A heating box is provided on the outside of the reaction body. The heating box is used to heat the heat transfer medium. The heating box is located on the side close to the heat transfer medium inlet and the heat transfer medium outlet. The heating box is provided with a box outlet and a box inlet. The box outlet is connected to the heat transfer medium inlet, and the box inlet is connected to the heat transfer medium outlet.

[0012] A circulation pump is installed on the main circulation channel of the heat transfer medium. The circulation pump is used to pump the heat transfer medium so that the heat transfer medium flows in the main circulation channel of the heat transfer medium.

[0013] The beneficial effects of the above technical solution are as follows: an even number of spiral stirring shafts are provided in the reaction chamber, and the spiral blades on the spiral stirring shafts are stacked one on top of the other on the side closest to each other. The two adjacent spiral blades cooperate with each other to stir the viscous polymer. The cooperating spiral blades generate a shearing effect on the viscous polymer, so that the viscous polymer is stirred more thoroughly and the polymerization reaction is carried out more fully. At the same time, when the spiral blades rotate, they can push the viscous polymer downward, which improves the fluidity of the viscous polymer and facilitates discharge.

[0014] After the viscous polymer enters the reaction chamber, it covers the main shaft. The main shaft is equipped with a heat-conducting medium channel, which heats the viscous polymer from the inside out. Compared with the method of heating the viscous polymer by setting a circulating heat-conducting medium on the reaction body, the heat is directly transferred to the viscous polymer, and the heat is utilized more fully.

[0015] The main shaft has an even number of shafts. Therefore, after connecting the various heat transfer medium channels using connecting short pipes, the two ends of the resulting heat transfer medium circulation channel will be located at the same end of the reaction body. That is, the heat transfer medium inlet and outlet are located at the same end of the reaction body. At this time, placing the heating box on this side can avoid setting up a long heat transfer medium circulation pipe on the outside of the reaction body. The box outlet and box inlet of the heating box can be directly connected to the heat transfer medium inlet and outlet, respectively, so that the heat transfer medium circulates almost entirely within the reaction cavity. This avoids the heat transfer medium flowing to the outside of the reaction cavity for a long time during circulation and exchanging heat with the external environment, which would lead to heat loss. This allows the heat to be used more fully to heat the reaction cavity and improves heating efficiency.

[0016] A circulation pump is installed on the main circulation channel of the heat transfer medium to provide power for the flow of the heat transfer medium and ensure that the heat transfer medium can circulate smoothly in the main circulation channel of the heat transfer medium.

[0017] Furthermore, the main shaft includes an inner shaft and a sleeve sleeved on the outside of the inner shaft. The outer surface of the inner shaft is provided with a spiral groove extending along its axial direction. The sleeve covers the spiral groove. The inner wall of the sleeve and the spiral groove form a spiral guide hole. Vertical holes extending in the vertical direction are provided at the center positions of the upper and lower ends of the inner shaft. Horizontal holes extending radially along the inner shaft are provided at the bottom of the spiral groove on both the upper and lower sides of the inner shaft. The horizontal holes communicate with the vertical holes. The vertical holes, horizontal holes, and spiral guide holes form the heat conduction medium channel.

[0018] The beneficial effects of the above technical solution are as follows: The spindle includes an inner shaft and a sleeve. The spiral groove on the outer surface of the inner shaft cooperates with the sleeve to form a spiral guide hole, allowing the heat transfer medium to flow and heat the reaction cavity. The spiral guide hole makes the heat provided by the heat transfer medium more evenly distributed in the circumferential direction of the spindle. Compared with a straight oil guide hole opened in the center of the spindle, the spiral guide hole only has a sleeve on the outside. The heat of the heat transfer medium in the spiral guide hole can be transferred to the reaction cavity more quickly, and the heat transfer loss is less. The sleeve and inner shaft are designed separately. When needed, the sleeve can be removed from the inner shaft to clean the spiral groove on the outer surface of the inner shaft, avoiding blockage of the spiral guide hole after long-term use. Cleaning the exposed spiral groove directly is more convenient.

[0019] Furthermore, the spiral groove includes a first spiral groove segment in the upper half and a second spiral groove segment in the lower half. The pitch of the second spiral groove segment is smaller than the pitch of the first spiral groove segment, such that the number of spiral coils in the second spiral groove segment is greater than the number of spiral coils in the first spiral groove segment.

[0020] The beneficial effects of the above technical solution are as follows: New viscous polymer is continuously injected into the reaction chamber. The viscous polymer flowing to the bottom has a longer reaction time and stirring time within the reaction chamber, resulting in a more complete polymerization reaction, which is already in the later stages of polymerization. Therefore, the molecular weight of the viscous polymer at the bottom is greater than that at the top, and its melting point is higher. The temperature required for the polymerization reaction to proceed fully at this point is also higher. Furthermore, by designing the spiral grooves with a higher number of spiral coils and a denser spiral distribution at the bottom, more heat-conducting medium can be stored in the lower spiral grooves, ensuring that the temperature at the bottom of the reaction chamber is higher than at the top, thus guaranteeing the full polymerization reaction of the viscous polymer at the bottom of the reaction chamber.

[0021] Furthermore, the main shaft is fixed on the reaction body, and the helical blade is rotatably mounted on the main shaft around the axis of the main shaft. One end of the helical blade is connected to a drive mechanism, which is used to drive the helical blade to rotate on the main shaft to stir the polymer in the reaction chamber.

[0022] The beneficial effects of the above technical solution are as follows: The helical blades are rotatably mounted on the main shaft, and the helical blades rotate on the main shaft to stir the viscous polymer. The main shaft does not rotate, and there is no relative rotation between the main shaft and the connecting short pipe, nor between the main shaft and the outlet and inlet of the heating box. There is also no relative rotation at the connection points on the main circulation channel of the heat transfer medium. Therefore, a dynamic sealing structure is unnecessary; a static sealing structure can be used to seal each connection point, resulting in a simpler structure and lower cost. Simultaneously, as the helical blades rotate on the main shaft, relative movement occurs between the inner ring of the helical blades and the outer wall of the main shaft. When the helical blades rotate, they scrape away the viscous polymer adhering to the outer wall of the main shaft and push it downwards, thus cleaning the outer wall of the main shaft.

[0023] Furthermore, the helical blade includes a first helical blade segment in the upper half and a second helical blade segment in the lower half, wherein the pitch of the second helical blade segment is greater than the pitch of the first helical blade segment.

[0024] The beneficial effects of the above technical solution are as follows: the pitch of the lower second helical blade segment is greater than that of the upper first helical blade segment, allowing the polymer to be slowly conveyed downwards when it first enters the reaction chamber, thus agitating the polymer for a sufficient time to ensure the polymerization reaction proceeds fully. Furthermore, when the viscous polymer is conveyed to the bottom of the reaction chamber, it can be quickly discharged, improving discharge efficiency. Simultaneously, the lower viscous polymer has a higher viscosity, and the larger pitch below the helical blades results in a greater vertical thrust, facilitating the downward pushing of the higher-viscosity polymer for discharge.

[0025] Furthermore, the driving mechanism includes a servo motor and a transmission assembly. The servo motor is connected to the transmission assembly, and the transmission assembly is connected to the helical blade. The servo motor is used to drive the helical blade to rotate synchronously, and before driving the helical blade to rotate synchronously, it drives the helical blade to rotate relative to each other by a predetermined angle to adjust the gap size in the vertical direction on the side of two adjacent helical blades that are close to each other.

[0026] The beneficial effects of the above technical solution are as follows: Before the spiral blades start to rotate synchronously to stir the polymer in the reaction chamber, the spiral blades are first driven to rotate at a set angle by a servo motor to adjust the gap between two adjacent spiral blades in the vertical direction, so that the two spiral blades rotate synchronously after maintaining the set gap to stir the polymer. When it is necessary to clean the spiral blades, the gap between the spiral blades is adjusted to a smaller gap, so that the two adjacent spiral blades scrape off the sticky polymer adhering to the blades, thereby achieving the purpose of self-cleaning.

[0027] Furthermore, the top of the reaction body is provided with a feed inlet for feeding viscous polymer, and the bottom of the reaction body is provided with a discharge outlet for discharging the highly viscous polymer after the polymerization reaction is completed.

[0028] Furthermore, the top of the reaction body is provided with a mounting bracket, the heating box is mounted on the mounting bracket, the box outlet and the box inlet are located at the bottom of the heating box, the heat transfer medium inlet and the heat transfer medium outlet are both located at the top of the reaction body, and are respectively opposite to the box outlet and the box inlet.

[0029] The beneficial effects of the above technical solution are: the mounting bracket and heating box are set on the top of the reaction body, so that the box outlet and box inlet can correspond to the heat transfer medium inlet and heat transfer medium outlet. After the heat transfer medium flows out of the reaction body, it can flow directly into the heating box. The hot oil in the heating box can flow directly into the reaction body, avoiding heat loss.

[0030] Furthermore, the connecting short tube is U-shaped and connects the top of two adjacent main shafts and the bottom of two adjacent main shafts to connect the heat transfer medium channels on different main shafts; a circulation pump is installed on each of the connecting short tubes.

[0031] The beneficial effects of the above technical solution are: each connecting short pipe is equipped with a circulation pump to provide power for the flow of the heat transfer medium at each main shaft, ensuring that the heat transfer medium can flow smoothly in the heat transfer medium channel.

[0032] Furthermore, a material box is provided at the feed inlet, which is used to hold the viscous polymer to be stirred. A conveying auger is provided inside the material box, which is used to uniformly convey the viscous polymer in the material box into the reaction chamber.

[0033] The beneficial effects of the above technical solution are: the conveying auger can uniformly deliver viscous polymer into the reaction chamber, ensuring continuous feeding into the reaction chamber. Attached Figure Description

[0034] The above and other objects, features, and advantages of exemplary embodiments of the present invention will become readily apparent upon reading the following detailed description with reference to the accompanying drawings. In the drawings, several embodiments of the invention are illustrated by way of example and not limitation, and like or corresponding reference numerals denote like or corresponding parts, wherein:

[0035] Figure 1 A schematic diagram of a polymerization apparatus for a high-viscosity polymer provided by the present invention;

[0036] Figure 2 A longitudinal sectional view of a polymerization apparatus for a high-viscosity polymer provided by the present invention;

[0037] Figure 3 A cross-sectional view of a polymerization apparatus for a high-viscosity polymer provided by the present invention;

[0038] Figure 4 A schematic diagram of the structure of a spiral stirring shaft in a polymerization apparatus for a high-viscosity polymer provided by the present invention;

[0039] Figure 5 A cross-sectional view of a spiral stirring shaft in a polymerization apparatus for a high-viscosity polymer provided by the present invention;

[0040] Figure 6 A cross-sectional view of the inner shaft in a polymerization apparatus for a high-viscosity polymer provided by the present invention.

[0041] Explanation of reference numerals in the attached figures:

[0042] 1. Reaction body; 2. Mounting bracket; 3. Heating chamber; 4. Chamber inlet; 5. Chamber outlet; 6. Heat transfer medium outlet; 7. Heat transfer medium inlet; 8. Connecting short pipe; 9. Helical blade; 10. Sleeve; 11. Inner shaft; 12. Helical groove; 13. Horizontal hole; 14. Vertical hole; 15. Reaction cavity; 16. Circulation pump; 17. Servo motor; 18. Transmission gear; 19. Transmission gear ring; 20. Rotating sleeve; 21. First helical groove segment; 22. Second helical groove segment; 23. First helical blade segment; 24. Second helical blade segment. Detailed Implementation

[0043] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Those skilled in the art should understand that the embodiments described below are only some, not all, of the embodiments disclosed. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0044] The following is an embodiment of a polymerization apparatus for high-viscosity polymers provided by the present invention:

[0045] like Figure 1 , Figure 2 and Figure 3As shown, a polymerization apparatus for a high-viscosity polymer includes a reaction body 1 with a figure-eight shaped cross-section. The reaction body 1 comprises two intersecting cylindrical sections, the inner cavities of which form a reaction chamber 15. The reaction body 1 has an inlet at the top and an outlet at the bottom. A material hopper is located at the inlet, communicating with the inner cavity of the hopper. A conveying auger is installed inside the hopper to uniformly transport the viscous polymer from the hopper into the reaction chamber 15. Each cylindrical section contains a spiral stirring shaft extending vertically, used to stir the viscous polymer to ensure a complete polymerization reaction. Figure 4 As shown, the spiral stirring shaft includes a main shaft and a spiral blade 9 sleeved on the outside of the main shaft and extending along the length of the main shaft. The spiral blade 9 is separate from the main shaft and is rotatably assembled on the outside of the main shaft.

[0046] like Figure 5 As shown, the spindle includes an inner shaft 11 and a sleeve 10 fitted around the outer side of the inner shaft 11. The outer surface of the inner shaft 11 has a helical groove 12 extending axially. The helical groove 12 includes a first helical groove section 21 in the upper half and a second helical groove section 22 in the lower half. The pitch of the second helical groove section 22 is smaller than the pitch of the first helical groove section 21, and the number of spiral coils in the second helical groove section 22 is greater than the number of spiral coils in the first helical groove section 21. The sleeve 10 covers the helical groove 12 on the surface of the inner shaft 11, and the inner wall of the sleeve 10 and the helical groove 12 form a helical guide hole. Figure 6 As shown, vertical holes 14 extending in the vertical direction are provided at the center of both ends of the inner shaft 11. Horizontal holes 13 extending radially from the bottom of the spiral groove 12 are provided on both the upper and lower sides of the inner shaft 11. The horizontal holes 13 communicate with the corresponding vertical holes 14. The vertical holes 14, horizontal holes 13, and spiral guide holes on the inner shaft 11 are interconnected to form a heat transfer medium channel for the flow of the heat transfer medium. The heat transfer medium can be heat transfer oil, water, heat transfer steam, etc.

[0047] The upper and lower ends of the inner shaft 11 are fixedly installed on the reaction body 1. The sleeve 10 is tightly fitted with the inner shaft 11. The top and bottom ends of the sleeve 10 are provided with sealing rings between them and the inner shaft 11. The top and bottom ends of the sleeve 10 are also connected with end caps to prevent the heat transfer medium from overflowing between the inner shaft 11 and the sleeve 10.

[0048] A U-shaped connecting short pipe 8 connects the outlets of the heat-conducting medium channels located at the bottom of the two inner shafts 11. A sealing ring is provided between the connecting short pipe 8 and the heat-conducting medium channels. The inner cavity of the connecting short pipe 8 and the heat-conducting medium channels in the two inner shafts 11 together form a total heat-conducting medium circulation channel. A circulation pump 16 is installed on the connecting short pipe 8. The circulation pump 16 is used to pump the heat-conducting medium to make the heat-conducting medium circulate in the total heat-conducting medium circulation channel. The two outlets of the total heat-conducting medium circulation channel are located at the top of the two inner shafts 11. One outlet of the total heat-conducting medium circulation channel is the heat-conducting medium inlet 7, and the other outlet is the heat-conducting medium outlet 6. A mounting bracket 2 is provided on the top of the reaction body 1. A heating box 3 is mounted on the mounting bracket 2. The bottom of the heating box 3 is provided with a box outlet 5 and a box inlet 4. The box outlet 5 is connected to the heat-conducting medium inlet 7, and the box inlet 4 is connected to the heat-conducting medium outlet 6. A sealing ring is provided at the connection position.

[0049] Both spiral blades 9 on the two spiral stirring shafts are right-handed. The ends of the two spiral blades 9 that are close to each other are staggered in the vertical direction, with a gap between them in the vertical direction. Each spiral blade 9 includes a first spiral blade segment 23 in the upper half and a second spiral blade segment 24 in the lower half. The pitch of the second spiral blade segment 24 is greater than the pitch of the first spiral blade segment 23. A coaxial rotating sleeve 20 is fixedly connected to the bottom of each spiral blade 9. The rotating sleeve 20 is rotatably mounted on the sleeve 10 and extends out of the reaction body 1. Figure 2 As shown, the bottom of the reaction body 1 is provided with a driving mechanism, which includes a servo motor 17 and a transmission assembly. The transmission assembly includes a transmission gear 18 and a transmission gear ring 19. The transmission gear 18 is connected to the output end of the servo motor 17, and the transmission gear ring 19 is sleeved on the bottom of the rotating sleeve 20. The transmission gear 18 and the transmission gear ring 19 mesh and drive each other so that when the servo motor 17 drives the transmission gear 18 to rotate, it drives the transmission gear ring 19 to rotate, thereby driving the spiral blade 9 to rotate.

[0050] In operation, this invention drives the conveying auger in the feed hopper to rotate, conveying viscous polymer into the reaction chamber 15. One servo motor 17 is activated, driving the spiral blades 9 to rotate at a predetermined angle, adjusting the two spiral blades 9 to a predetermined gap. Then, the other servo motor 17 is activated, and the two servo motors 17 drive their corresponding spiral blades 9 to rotate, maintaining the same rotation speed to stir the viscous polymer in the reaction chamber 15. Simultaneously, the heat transfer medium in the heating chamber 3 is pumped by the circulating pump 16 into the main heat transfer medium circulation pipeline to heat the reaction chamber 15, ensuring the polymerization reaction of the viscous polymer proceeds fully. While stirring the viscous polymer, the spiral blades 9 slowly push the polymer downwards, and new polymer to be stirred is simultaneously conveyed to the reaction chamber 15 by the conveying auger. When the viscous polymer is conveyed to the bottom of the reaction chamber 15, the polymerization reaction is complete, and the polymer is discharged from the outlet at the bottom of the reaction body 1. After all the polymers have completed the polymerization reaction, the servo motor 17 stops rotating. Then, one of the servo motors 17 drives the corresponding spiral blade 9 to rotate at a predetermined angle so that the two spiral blades 9 move closer to each other in the vertical direction, adjusting the vertical gap between the two spiral blades 9 to a smaller state. The two servo motors 17 then rotate synchronously at the same speed to drive the two spiral blades 9 to rotate synchronously at the same speed, so that the two spiral blades 9 scrape off the sticky polymer adhering to the blades. The scraped-off sticky polymer is transported downwards as the spiral blades 9 rotate, playing a self-cleaning role.

[0051] This invention uses connecting short pipes to connect the heat-conducting medium channels in each inner shaft into a total heat-conducting medium circulation channel. Except for the connecting short pipes, the entire part of the total heat-conducting medium circulation channel is located in the reaction cavity. The heat-conducting medium inlet and outlet of the total heat-conducting medium circulation channel are located on the same side and are directly connected to the box outlet and box inlet of the heating box, respectively. After the heat-conducting medium heats the reaction cavity, it flows directly into the heating box for heating, effectively reducing heat loss and making fuller use of heat.

[0052] In this embodiment, both helical blades rotate clockwise. During stirring, the two helical blades need to rotate in the same direction. In other embodiments, one helical blade rotates counterclockwise and the other rotates clockwise, in which case the two helical blades rotate in opposite directions.

[0053] In this embodiment, the helical blade is rotatably mounted on the sleeve. In other embodiments, the helical blade is fixed on the sleeve. In this case, the main shaft is rotatably mounted on the reaction body. The rotation of the main shaft drives the helical blade to rotate. Therefore, relative rotation occurs between the connecting short pipe and the inner shaft, and relative rotation occurs between the inner shaft and the outlet and inlet of the heating box. A dynamic sealing structure needs to be provided at the above-mentioned locations where relative rotation occurs.

[0054] In this embodiment, the pitch of the lower second helical blade segment is greater than the pitch of the upper first helical blade segment. In other embodiments, the pitch of the helical blades remains the same.

[0055] In this embodiment, the pitch of the lower second spiral groove segment in the spiral groove is less than the pitch of the upper first spiral groove segment, and the number of spiral coils is greater than the number of spiral coils of the upper first spiral groove. In other embodiments, the pitch of the spiral groove remains the same.

[0056] Based on the above description in this specification, those skilled in the art will also understand that the following terms used, such as "upper," "lower," "front," "rear," "left," "right," "width," "horizontal," "top," "bottom," "inner," and "outer" (these terms need to be adjusted and replaced according to the specific case), are terms indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings of this specification. They are only for the purpose of facilitating the explanation of the present invention and simplifying the description, and do not explicitly or implicitly suggest that the device or element involved must have the specific orientation, or be constructed and operated in a specific orientation. Therefore, the above-mentioned orientation or positional relationship terms should not be understood or interpreted as a limitation on the present invention.

[0057] In addition, in the description of this specification, "multiple" means at least two, such as two, three or more, etc., unless otherwise expressly and specifically defined.

Claims

1. A polymerization apparatus for a high-viscosity polymer, characterized in that, include: The reaction body has a reaction cavity, in which an even number of spiral stirring shafts for stirring high-viscosity polymers are provided. The spiral stirring shaft includes a main shaft and spiral blades connected to the outside of the main shaft. The spiral blades of each pair of adjacent spiral stirring shafts are staggered on the side closest to each other. The main shaft is provided with a heat-conducting medium channel running vertically through it. The heat-conducting medium channels in each main shaft are connected by connecting short pipes to form a serpentine heat-conducting medium circulation channel. One end of the heat-conducting medium circulation channel is the heat-conducting medium inlet, and the other end is the heat-conducting medium outlet. The heat-conducting medium inlet and the heat-conducting medium outlet are located at the same end of the reaction body. A heating box is provided on the outside of the reaction body. The heating box is used to heat the heat transfer medium. The heating box is located on the side close to the heat transfer medium inlet and the heat transfer medium outlet. The heating box is provided with a box outlet and a box inlet. The box outlet is connected to the heat transfer medium inlet, and the box inlet is connected to the heat transfer medium outlet. A circulation pump is provided on the main circulation channel of the heat transfer medium. The circulation pump is used to pump the heat transfer medium so that the heat transfer medium flows in the main circulation channel of the heat transfer medium. The main shaft includes an inner shaft and a sleeve fitted on the outside of the inner shaft. The outer surface of the inner shaft is provided with a spiral groove extending along its axial direction. The sleeve covers the spiral groove. The inner wall of the sleeve and the spiral groove form a spiral guide hole. Vertical holes extending in the vertical direction are provided at the center of the upper and lower ends of the inner shaft. Horizontal holes extending in the radial direction are provided at the bottom of the spiral groove on both the upper and lower sides of the inner shaft. The horizontal holes are connected to the vertical holes. The vertical holes, horizontal holes and spiral guide holes form a heat conduction medium channel. The spiral groove includes a first spiral groove segment in the upper half and a second spiral groove segment in the lower half. The pitch of the second spiral groove segment is smaller than that of the first spiral groove segment, so that the number of spiral coils in the second spiral groove segment is greater than that in the first spiral groove segment. The helical blade includes a first helical blade segment in the upper half and a second helical blade segment in the lower half, wherein the pitch of the second helical blade segment is greater than the pitch of the first helical blade segment; The sleeve and inner shaft are designed to be separate, allowing the sleeve to be removed from the inner shaft to clean the exposed spiral grooves on the outer surface of the inner shaft.

2. The polymerization apparatus for a high-viscosity polymer according to claim 1, characterized in that, The main shaft is fixed on the reaction body, and the helical blade is rotatably mounted on the main shaft around the axis of the main shaft. One end of the helical blade is connected to a drive mechanism, which is used to drive the helical blade to rotate on the main shaft to stir the polymer in the reaction chamber.

3. The polymerization apparatus for a high-viscosity polymer according to claim 2, characterized in that, The drive mechanism includes a servo motor and a transmission assembly. The servo motor is connected to the transmission assembly, and the transmission assembly is connected to the helical blade. The servo motor is used to drive the helical blade to rotate synchronously, and before driving the helical blade to rotate synchronously, it drives the helical blade to rotate relative to each other by a predetermined angle to adjust the gap size in the vertical direction on the side of two adjacent helical blades that are close to each other.

4. The polymerization apparatus for a high-viscosity polymer according to claim 1, characterized in that, The top of the reaction body is provided with a feed inlet for feeding viscous polymer, and the bottom of the reaction body is provided with a discharge outlet for discharging the highly viscous polymer after the polymerization reaction is completed.

5. The polymerization apparatus for a high-viscosity polymer according to claim 1, characterized in that, The top of the reaction body is provided with a mounting bracket, the heating box is mounted on the mounting bracket, the box outlet and the box inlet are located at the bottom of the heating box, the heat transfer medium inlet and the heat transfer medium outlet are both located at the top of the reaction body, and are respectively opposite to the box outlet and the box inlet.

6. The polymerization apparatus for a high-viscosity polymer according to claim 1, characterized in that, The connecting short tube is U-shaped and connects the top of two adjacent main shafts and the bottom of two adjacent main shafts to connect the heat transfer medium channels on different main shafts; each of the connecting short tubes is equipped with a circulation pump.

7. The polymerization apparatus for a high-viscosity polymer according to claim 4, characterized in that, The feed inlet is equipped with a feed hopper for holding the viscous polymer to be stirred. The feed hopper is equipped with a conveying auger for uniformly conveying the viscous polymer in the feed hopper into the reaction chamber.

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