Reaction kettle

Abstract

The utility model provides a reaction kettle. The reaction kettle comprises a kettle body, a stirring mechanism and a spraying mechanism, the spraying mechanism comprises a lifting device, a first pipeline, a second pipeline and a spherical nozzle, the first pipeline is arranged in the kettle body through the lifting device, one end of the second pipeline is communicated with the first pipeline, the other end of the second pipeline extends to the outside of the kettle body, and the spherical nozzle is arranged in the kettle body. The plurality of spherical nozzles are uniformly distributed on the first pipeline; the stirring mechanism comprises a stirring shaft as well as a first stirring paddle and a second stirring paddle which are mounted on the stirring shaft, and a scraping plate matched with the inner wall surface of the kettle body is arranged on the outer side of the second stirring paddle. According to the utility model, the spraying mechanism with the spherical nozzle is additionally arranged, so that materials can be flushed, and the scraper is combined to prevent the materials from caking and clustering; and the reaction kettle can be cleaned after the reaction is finished, so that the normal use of the reaction kettle is ensured.

Description

Technical Field

[0001] This utility model relates to the field of polyamic acid resin synthesis technology, and in particular to a reaction vessel. Background Technology

[0002] In the production of polyamic acid resin, most of the dianhydride and diamine monomers are in powder form. During the feeding process, dust easily forms inside the reactor, adhering to the reactor walls and stirring shaft. This prevents the adhering material from participating in the current stage of the reaction, hindering the realization of the polyamic acid molecular structure design and the control of the reaction process. Because the reactor is heated or the reaction synthesis releases a large amount of heat, the temperature inside the reactor wall is high. This causes the material adhering to the reactor wall to clump, agglomerate, and form gel points within the resin in the later stages of the reaction. Furthermore, it cannot be completely filtered in the later stages, resulting in black spots or particulate matter when processed into films or other product forms, affecting product quality and yield. It also causes a discrepancy between the anhydride / amine ratio participating in the reaction and the actual reaction ratio. Inaccurate anhydride / amine ratio affects the degree of reaction, hindering the control of molecular weight and resin viscosity, and easily leading to production inconvenience and resource waste.

[0003] The viscosity range of polyamic acid resin synthesis varies from 500 cp to 400,000 cp depending on the product application and scenario. The anhydride-amine ratio is crucial in affecting the degree of reaction, viscosity, molecular weight, and other indicators, thus requiring an accurate anhydride-amine ratio. Synthesizing high-viscosity polyamic acid resins often results in excessive viscosity, making cleaning difficult and requiring significant time and labor costs.

[0004] For example, in a reaction vessel according to the formula in existing patent publication number CN210788500U, a spray device is provided inside the reaction vessel. The spray device includes two lotus-shaped nozzles installed inside the vessel. The cleaning range of this type of nozzle is limited to the area below the lotus-shaped nozzle and the sides of the nozzle, resulting in a cleaning blind spot. This makes it unsuitable for reaction vessels used in the synthesis of polyamic acid resin. Utility Model Content

[0005] The purpose of this invention is to provide a reaction vessel that can rinse materials to prevent them from clumping, forming agglomerates, and settling to the bottom.

[0006] The technical solution of this utility model is: a reaction vessel, including a vessel body, a stirring mechanism, and a spraying mechanism. The spraying mechanism includes a lifting device, a first pipe, a second pipe, and spherical nozzles. The first pipe is placed inside the vessel body through the lifting device. One end of the second pipe is connected to the first pipe, and the other end of the second pipe extends to the outside of the vessel body. A plurality of spherical nozzles are evenly distributed on the first pipe. The stirring mechanism includes a stirring shaft and a first stirring blade and a second stirring blade installed on the stirring shaft. A scraper adapted to the inner wall of the vessel body is provided on the outer side of the second stirring blade.

[0007] In the above scheme, by adding a spraying mechanism with spherical nozzles, and having multiple spherical nozzles evenly distributed on the first pipe, the material can be rinsed over the largest area without any blind spots. It works together with the scraper to prevent the material from clumping or forming clumps. It can also quickly clean the reaction vessel after the reaction is completed, ensuring the normal use of the reaction vessel.

[0008] Preferably, the first stirring paddle includes two first blades and a first connecting joint, the second stirring paddle includes two second blades and a second connecting joint, both the first connecting joint and the second connecting joint are fitted onto the stirring shaft, the two first blades are symmetrically connected to the first connecting joint, the two second blades are symmetrically connected to the second connecting joint, and the scraper is connected to the second blades.

[0009] Preferably, the first and second stirring paddles are staggered vertically; the first and second blades are perpendicular to each other in the top view projection plane of the vessel.

[0010] Preferably, the first connecting joint is provided with a T-shaped groove, and the first blade is provided with a T-shaped connector adapted to the T-shaped groove, wherein the T-shaped connector and the T-shaped groove are detachably connected.

[0011] Preferably, the first blade is L-shaped with a right angle.

[0012] Preferably, the second blade includes a vertical plate, an inclined plate, and a connecting pipe. Two second connecting joints are provided on the stirring shaft. One end of the connecting pipe is connected to the second connecting joint provided above, and the other end of the connecting pipe is connected to the vertical plate. The lower end of the vertical plate is connected to one end of the inclined plate, and the other end of the inclined plate is connected to the second connecting joint provided below. The scraper is connected to the vertical plate and the inclined plate respectively.

[0013] Preferably, the scraper includes a movable plate and a meniscus. The movable plate is connected to the vertical plate by a horizontally arranged spring. The lower end of the meniscus forms an arc structure, and the upper end of the meniscus is connected to the inclined plate by fasteners.

[0014] Preferably, the bottom of the stirring shaft is provided with fan-shaped stirring blades.

[0015] Preferably, the second pipe includes a rigid pipe and a flexible pipe, the flexible pipe passing through the vessel body and connecting to the first pipe and the rigid pipe, the rigid pipe being located outside the vessel body, and the rigid pipe being equipped with a flow meter and a valve.

[0016] Preferably, a thermometer and a viscometer are provided on the side wall of the vessel, and the thermometer and viscometer extend into the vessel.

[0017] Compared with related technologies, the beneficial effects of this utility model are as follows:

[0018] I. This utility model adds a spraying mechanism with spherical nozzles, and multiple spherical nozzles are evenly distributed on the first pipe, which can wash the material over the largest area without any blind spots. The lifting device can drive the first pipe to rise and fall to wash the reactor wall, and work together with the scraper to prevent the material from clumping and forming clumps. It can also quickly clean the reactor after the reaction is completed to ensure the normal use of the reactor.

[0019] II. This invention effectively solves the problems of dust generation, wall adhesion, and agglomeration when adding diamine and dianhydride monomer powders. It effectively reduces material loss, facilitates precise control of the anhydride-amine ratio in the synthesis of polyamic acid resin, and facilitates control of the viscosity of the reaction resin. It also facilitates cleaning of the reactor after the reaction, saving time and improving efficiency.

[0020] Third, the scraper has a movable plate and a half-moon plate. The movable plate can elastically extend and retract to ensure effective scraping of the adhesive material. The half-moon plate solves the problems of material settling at the bottom, clumping at the bottom of the kettle, and adhesion during resin synthesis. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the internal structure of the reaction vessel provided by this utility model;

[0022] Figure 2 This is a schematic diagram of the installation structure of the first and second stirring blades inside the vessel.

[0023] Figure 3 This is a schematic diagram of the installation structure of the stirring shaft and the first stirring blade;

[0024] Figure 4 for Figure 1 Enlarged diagram of point A in the diagram.

[0025] In the attached diagram: 1. Vessel body; 101. Main body; 102. Top cover; 2. Stirring mechanism; 21. Motor; 22. Gearbox; 23. Stirring shaft; 24. First stirring paddle; 241. First blade; 2411. T-joint; 242. First connecting joint; 2421. T-slot; 25. Second stirring paddle; 251. Second blade; 2511. Vertical plate; 2512. Inclined plate; 2513. Connecting pipe; 252. Second connecting joint; 26. Scraper; 261. Movable plate; 262. Meniscus; 263. Spring; 27. Fan-shaped stirring blade; 3. Spraying mechanism; 31. Lifting device; 32. First pipe; 33. Second pipe; 331. Rigid pipe; 332. Flexible pipe; 34. Spherical nozzle; 35. Flow meter; 36. Valve; 4. Thermometer; 5. Viscometer; 6. Air outlet pipe; 7. Air inlet pipe; 8. Feed inlet; 9. Visual mirror; 10. Heat transfer medium outlet; 11. Heat transfer medium inlet; 12. Discharge port; 13. Support leg; 14. Pressure gauge. Detailed Implementation

[0026] The present invention will be described in detail below with reference to the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in the embodiments of the present invention can be combined with each other. For ease of description, the terms "upper," "lower," "left," and "right" appearing below only indicate that they correspond to the upper, lower, left, and right directions in the accompanying drawings and do not limit the structure.

[0027] like Figure 1 As shown, the reactor provided in this embodiment includes a reactor body 1, a stirring mechanism 2, a spraying mechanism 3, a thermometer 4, a viscometer 5, an exhaust pipe 6, an inlet pipe 7, a feed inlet 8, a viewing mirror 9, a heat transfer medium outlet 10, a heat transfer medium inlet 11, a discharge outlet 12, a support leg 13, and a pressure gauge 14.

[0028] The reactor body 1 includes a main body 101 and an upper cover 102 that fits onto the main body 101. The upper cover 102 has a feed inlet 8, a pressure gauge 14, an exhaust pipe 6, a viewing mirror 9, and an air inlet pipe 7. The side wall of the main body 101 has a heat transfer medium outlet 10, a heat transfer medium inlet 11, a discharge port 12, a thermometer 4, and a viscometer 5, all communicating with the interior of the reactor body 1. The support legs 13 are triangularly positioned at the bottom of the main body 101, providing stable support. The bottom of the support legs 13 is equipped with a silent, anti-slip pad to effectively reduce vibration and slippage of the reactor. The viscometer 5 is an online viscometer, which monitors the viscosity of the material in real time. The thermometer 4 monitors the temperature of the material in real time, allowing for adjustments by the operator based on the monitored values. The positions of the thermometer 4 and the viscometer 5 do not interfere with the stirring mechanism 2.

[0029] The stirring mechanism 2 includes a motor 21, a gearbox 22, a stirring shaft 23, a first stirring paddle 24, a second stirring paddle 25, a scraper 26, and a fan-shaped stirring blade 27. The output shaft of the motor 21 is connected to the input shaft of the gearbox 22, which is mounted on the top of the upper cover 102 via a mounting bracket. The output shaft of the gearbox 22 is connected to the stirring shaft 23 via a coupling, and the stirring shaft 23 extends into the vessel body 1. The first stirring paddle 24 and the second stirring paddle 25, located below the first stirring paddle 24, are mounted on the stirring shaft 23. The first stirring paddle 24 and the second stirring paddle 25 are housed within the main body 101.

[0030] like Figure 3 As shown, the first stirring impeller 24 includes two first blades 241 and a first connecting joint 242. The first blades 241 are L-shaped with right angles and have T-shaped connectors 2411 at their ends. The first connecting joint 242 is rectangular with a central hole that fits onto the stirring shaft 23 and is axially fixed by screws. T-shaped grooves 2421 are provided on both opposite sides of the first connecting joint 242. The first blades 241 slide into the T-shaped grooves 2421 through the T-shaped connectors 2411, thus fixing the first blades 241 to the first connecting joint 242. The T-shaped grooves 2421 are open at both ends, allowing for detachable connection of the first blades 241. To prevent the first blades 241 from disengaging during rotation, screws can be used to fix the T-shaped connectors 2411 into the T-shaped grooves 2421. Different structures of first blades 241 can be installed on the first connecting joint 242 according to usage requirements.

[0031] like Figure 1 As shown, the second stirring paddle 25 includes two second blades 251 and two second connecting joints 252. Each second blade 251 includes a vertical plate 2511, an inclined plate 2512, and a connecting pipe 2513. Each second connecting joint 252 is a round tube, fitted onto the stirring shaft 23 and fixed with screws. Two second connecting joints 252 are provided on the stirring shaft 23. One end of the connecting pipe 2513 is connected to the upper second connecting joint 252 (optionally by welding), and the other end of the connecting pipe 2513 is connected to the vertical plate 2511. The lower end of the vertical plate 2511 is connected to one end of the inclined plate 2512, and the other end of the inclined plate 2512 is connected to the lower second connecting joint 252.

[0032] like Figure 2As shown, the two first blades 241 are symmetrically positioned on both sides of the first connecting joint 242 in a first direction. The two second blades 251 are symmetrically positioned on both sides of the second connecting joint 252 in a second direction. The first and second directions are perpendicular to each other in the top view projection plane of the reactor body. The first stirring paddle 24 and the second stirring paddle 25 can stir the materials during the synthesis reaction in the reactor, making the reaction more complete.

[0033] like Figure 1 As shown, the two inclined plates 2512 form a V-shape. The scraper 26 includes a movable plate 261, a meniscus 262, and a spring 263. Figure 4 As shown, one end of the spring 263 is connected to the vertical plate 2511, and the other end of the spring 263 is connected to the movable plate 261. A mounting sleeve is provided on the vertical plate 2511, and the spring 263 is placed in the mounting sleeve. The overhang length of the mounting sleeve needs to take into account the elastic extension and contraction stroke of the movable plate 261. Additionally, a connecting block can be provided at the end of the spring 263, and the movable plate 261 and the connecting block are detachably connected by fasteners.

[0034] like Figure 1 As shown, the lower end of the meniscus 262 forms an arc structure, and the upper end of the meniscus 262 is connected to the inclined plate 2512 by fasteners. The arc structure of the meniscus 262 is adapted to the inner wall of the bottom of the vessel body 1. The bottom of the stirring shaft 23 is provided with a fan-shaped stirring blade 27, which is located directly above the discharge port 12.

[0035] The scraper 26 not only scrapes away material from the vessel walls and bottom, but also acts as a stirrer. Furthermore, the scraper 26 is detachable, facilitating disassembly, installation, replacement, and cleaning, making it particularly suitable for electronic-grade polyamic acid resins requiring high cleanliness. The fan-shaped stirring blades 27 at the bottom effectively prevent material from settling and accumulating at the bottom of the reactor.

[0036] like Figure 1As shown, the spraying mechanism 3 includes a lifting device 31, a first pipe 32, a second pipe 33, spherical nozzles 34, a flow meter 35, and a valve 36. The lifting device 31 may include a lifting motor, a lifting screw, or other similar lifting drive components, which are mounted on the upper cover 102, with its power output end connected to the first pipe 32. The first pipe 32 is annular and horizontally placed within the upper cover 102. The lifting device 31 drives the first pipe 32 to rise and fall, increasing its spraying cleaning range. Multiple spherical nozzles 34 are connected to the first pipe 32. Using spherical nozzles 34 increases the spraying range, enabling 360° cleaning of the stirring shaft 23 and the vessel wall without dead angles. A screw can be installed on the spherical nozzle 34. This screw is hollow inside and threadedly connected to the first pipe 32 to facilitate disassembly and cleaning of the spherical nozzle 34.

[0037] The second pipe 33 includes a rigid pipe 331 and a flexible pipe 332. The flexible pipe 332 passes through the vessel body 1 and connects to the first pipe 32 and the rigid pipe 331. The flexible pipe 332 can adapt to the deformation of the first pipe 32 as it rises and falls. The rigid pipe 331 is located outside the vessel body 1 and is connected to the source of the sprayed liquid (such as the solvent in the reaction). The rigid pipe 331 is equipped with a flow meter 35 and a valve 36. The flow meter 35 measures the amount of sprayed liquid added, which facilitates the subsequent control of the resin viscosity and solid content.

[0038] In the synthesis of polyamic acid, diamine monomers are generally added first, and then dianhydride monomers are added after the diamine monomers dissolve. This process often results in some material adhering to the reactor walls, and material may also adhere to the feed inlet 8 and stirring shaft 23. By using pre-reserved reaction solvent, the solvent is sequentially sprayed through the second pipe 33 and the first pipe 32, and then evenly sprayed around the reactor using spherical nozzles 34. The reactor walls are then cleaned under pressure to prevent material adhesion. Furthermore, the synthesis of polyamic acid generally uses highly polar aprotic solvents, which readily absorb water. If the solvent contains moisture, it will affect the increase in resin viscosity, making it difficult to synthesize high molecular weight resins. The spraying mechanism 3 prevents the solvent from absorbing water through contact with air during the rinsing of the reactor walls and feed inlet 8.

[0039] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the content of this utility model specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A reaction vessel, comprising a vessel body, characterized in that, It also includes a stirring mechanism and a spraying mechanism. The spraying mechanism includes a lifting device, a first pipe, a second pipe, and spherical nozzles. The first pipe is placed inside the vessel body through the lifting device. One end of the second pipe is connected to the first pipe, and the other end of the second pipe extends to the outside of the vessel body. Multiple spherical nozzles are evenly distributed on the first pipe. The stirring mechanism includes a stirring shaft and a first stirring blade and a second stirring blade installed on the stirring shaft. A scraper adapted to the inner wall of the vessel body is provided on the outer side of the second stirring blade.

2. The reaction vessel according to claim 1, characterized in that, The first stirring paddle includes two first blades and a first connecting joint, and the second stirring paddle includes two second blades and a second connecting joint. The first connecting joint and the second connecting joint are both fitted onto the stirring shaft. The two first blades are symmetrically connected to the first connecting joint, and the two second blades are symmetrically connected to the second connecting joint. The scraper is connected to the second blades.

3. The reaction vessel according to claim 2, characterized in that, The first and second stirring paddles are staggered vertically, and the first and second blades are perpendicular to each other in the top view projection plane of the vessel.

4. The reaction vessel according to claim 2, characterized in that, The first connecting joint is provided with a T-shaped groove, and the first blade is provided with a T-shaped joint that is adapted to the T-shaped groove. The T-shaped joint and the T-shaped groove are detachably connected.

5. The reaction vessel according to claim 2, characterized in that, The first blade is L-shaped with a right angle.

6. The reaction vessel according to claim 2, characterized in that, The second blade includes a vertical plate, an inclined plate, and a connecting pipe. Two second connecting joints are provided on the stirring shaft. One end of the connecting pipe is connected to the second connecting joint provided above, and the other end of the connecting pipe is connected to the vertical plate. The lower end of the vertical plate is connected to one end of the inclined plate, and the other end of the inclined plate is connected to the second connecting joint provided below. The scraper is connected to the vertical plate and the inclined plate respectively.

7. The reaction vessel according to claim 6, characterized in that, The scraper includes a movable plate and a meniscus. The movable plate is connected to the vertical plate by a horizontally arranged spring. The lower end of the meniscus forms an arc structure, and the upper end of the meniscus is connected to the inclined plate by fasteners.

8. The reaction vessel according to claim 1, characterized in that, The bottom of the stirring shaft is equipped with fan-shaped stirring blades.

9. The reaction vessel according to claim 1, characterized in that, The second pipeline includes a rigid pipe and a flexible pipe. The flexible pipe passes through the vessel body and connects to the first pipeline and the rigid pipe. The rigid pipe is located outside the vessel body and is equipped with a flow meter and a valve.

10. The reaction vessel according to claim 1, characterized in that, The thermometer and viscometer are installed on the side wall of the vessel, and the thermometer and viscometer extend into the vessel.

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