Polymerization device and chloroprene solution polymerization method

Abstract

The invention relates to the technical field of equipment related to chemical or physical methods, in particular to a polymerization device and a chloroprene solution polymerization method.The polymerization device comprises a kettle body, and a discharging port is formed in the kettle body; a kettle cover is arranged at the top of the kettle body; a feeding hole is formed in the kettle cover; the top of the kettle cover is fixedly connected with a steering engine through a bracket, an output shaft of the steering engine is concentrically and fixedly connected with a stirring shaft, the stirring shaft rotatably penetrates through the kettle cover and is arranged in an inner cavity of the kettle body, and more than two groups of stirring blades are sequentially arranged on the stirring shaft in the kettle body from top to bottom; at least one flange plate is fixedly connected to the top of the kettle cover and is communicated with the kettle body; a ring cylinder is fixedly connected into an inner cavity of the flange plate, an opening is formed in the top of a ring cavity of the ring cylinder, and the bottom of the ring cavity of the ring cylinder communicates with at least two heat dissipation pipelines. A circulating pipeline is arranged in the annular cylinder; the invention also discloses a chloroprene solution polymerization method applied to the polymerization device. According to the invention, the problem of how to remove heat generated in the polymerization reaction is solved.

Description

Technical Field

[0001] The invention relates to the technical field of equipment related to chemical or physical methods, and in particular to a polymerization device and a chloroprene solution polymerization method. Background Art

[0002] The production technology of chloroprene emulsion polymerization is divided into continuous emulsion polymerization and intermittent emulsion polymerization; continuous emulsion polymerization is from adding materials (adding initiator after emulsification of auxiliary agent solution) to entering the polymerization kettle, and after passing through multiple polymerization kettles in series, the required polymerization depth (commonly known as conversion rate) can be achieved. It is a process of continuous feeding and continuous output of products (or production method); intermittent emulsion polymerization is also called single-pot polymerization. Like continuous emulsion polymerization, intermittent emulsion polymerization is also divided into three stages, namely material preparation, metering and emulsification. After the initially emulsified material enters the polymerization kettle, the initiator is added separately and the temperature is raised to initiate polymerization. After reaching the predetermined polymerization depth (conversion rate), the terminator is added to terminate the polymerization; heat is generated during the polymerization reaction. The related prior art of the above-mentioned polymerization kettle is disclosed in the Chinese Patent Library. For example, a polymerization kettle is disclosed in the announcement number CN102029138B, which includes a kettle body with a feed port and a discharge port, a jacket arranged on the outer periphery of the kettle body, an agitator, a shaft seal, and a transmission device. The agitator includes a main shaft drivingly connected to the transmission device, a first spiral belt spirally rising to the right in an equal-pitch spiral manner around the lower part of the main shaft, and a second spiral belt spirally rising to the left in an equal-pitch spiral manner and having the same shape as the first spiral belt, and a frame fixedly arranged on the main shaft and located at the periphery of the first spiral belt and the second spiral belt.

[0003] For another example, a polymerization kettle is disclosed in the announcement number CN107297191A, wherein a kettle cover is arranged on the upper part of the kettle body, and the kettle bottom is a conical structure; a feed port is arranged on the kettle cover; a discharge port is arranged in the center of the bottom of the kettle bottom; a jacket is arranged on the outer periphery of the kettle body and the kettle bottom, and a plurality of guide plates are arranged inside the jacket; a conveying device is fixed above the kettle cover, the upper end of the stirring shaft is connected to the transmission device, the lower end of the stirring shaft extends into the interior of the kettle body, the outer sleeve of the stirring shaft is provided with a stirring shaft sleeve, and the top end of the stirring shaft sleeve is fixed to the inner wall of the kettle cover; a plurality of agitators are staggeredly connected to the stirring shaft, and a bottom scraper is connected to the bottom of the stirring shaft; the outer top of each agitator is provided with a kettle wall scraper, and the middle of each agitator is connected with a stirring shaft sleeve scraper.

[0004] The problem with the above two prior arts (CN102029138B, CN107297191A) is that they do not disclose a heat dissipation device for removing the heat generated in the polymerization reaction. Summary of the invention

[0005] In view of this, the object of the present invention is to provide a polymerization device and a chloroprene solution polymerization method, which solves the problem of how to remove the heat generated in the polymerization reaction.

[0006] In the first aspect, the present invention discloses a polymerization device, comprising a kettle body, a discharge port is provided at the bottom of the kettle body, and an electric valve for discharging or cutting off the material is provided on the discharge port; a kettle cover is provided on the top of the kettle body, and a loading port is provided on the kettle cover, and a detachable cover is installed on the loading port; the top of the kettle cover is fixedly connected to a steering gear through a bracket, and a stirring shaft is coaxially fixedly connected to the output shaft of the steering gear, and the stirring shaft can rotatably pass through the kettle cover and is placed in the inner cavity of the kettle body, and more than two groups of stirring blades are arranged on the stirring shaft placed in the kettle body from top to bottom; at least one flange is fixedly connected to the top of the kettle cover, and the flange is connected to the kettle body; an annular cylinder is fixedly connected in the inner cavity of the flange, and an opening is formed at the top of the annular cavity of the annular cylinder, and at least two heat dissipation pipes are connected at the bottom of the annular cavity of the annular cylinder; a circulation pipeline is provided in the annular cylinder, and flowing refrigerated brine is provided in the circulation pipeline; reinforcing ribs are connected between adjacent heat dissipation pipes.

[0007] Specifically, the cover includes a barrel, which is connected to the feeding port, and a cover plate is buckled on the top of the barrel; an arch arm is fixedly connected to the cover plate, and one end of the arch arm is hinged to the barrel; a locking groove is formed on the other end of the arch arm, and a pull rod is installed in the locking groove; the pull rod is rotatably connected to the flange on the outer wall of the barrel, and a knob is provided on the free end of the pull rod; when the pull rod is placed in the locking groove, the knob and the pull rod thread are tightened and the knob is squeezed into contact with the lock groove.

[0008] Specifically, the circulation pipeline includes a water inlet loop and a water return loop, and the water inlet loop and the water return loop are placed in the annular cavity of the annular cylinder; the water inlet loop is connected with a water inlet branch, the water inlet branch passes through the annular cylinder and is connected with a chilled brine storage tank, and a circulation pump body is arranged in the chilled brine storage tank; the return water loop is connected with a return water branch, the return water branch passes through the annular cylinder and is connected with the chilled brine storage tank; one end of a single U-shaped delivery pipe is connected with the water inlet loop, and the other end of the U-shaped delivery pipe bypasses the side wall and bottom wall of the corresponding heat dissipation pipe and is connected with the return water loop.

[0009] As an optimization of the heat dissipation pipe, the shape of the heat dissipation pipe gradually bends outward from high to low.

[0010] As an optimization of the present invention, the polymerization device also includes a scraping mechanism, which is connected to the heat dissipation pipe; the scraping mechanism includes a telescopic scraper unit, a threaded shaft is threadedly connected to the sliding end of the telescopic scraper unit, and at least two sliding sleeves of the telescopic scraper unit are respectively slidably connected with adjacent heat dissipation pipes; the bottom of the threaded shaft is rotatably connected with the reinforcing rib, the top of the threaded shaft is rotatably connected with the support seat on the flange, and the threaded shaft is transmitted to the output shaft of the servo through a belt.

[0011] More specifically, the telescopic scraper unit includes a threaded sleeve, which is threadedly connected to the threaded shaft, and at least two sliding bodies are formed at equal angles on the outer wall of the threaded sleeve; a sliding cavity is slidably connected to the single sliding body, and the sliding sleeve is fixedly connected to the free end of the sliding cavity, and the sliding sleeve is slidably connected to the corresponding heat dissipation pipe.

[0012] As an optimization of the present invention, the polymerization device also includes a refrigeration pipeline, both ends of which are connected to the frozen brine storage tank, and a refrigeration device is provided on the refrigeration pipeline; a first one-way valve is provided on the return water branch, and the flow direction of the first one-way valve is toward the frozen brine storage tank; a second one-way valve is provided on the refrigeration pipeline, and the flow direction of the second one-way valve is away from the frozen brine storage tank.

[0013] As an optimization of the present invention, the polymerization device also includes an automatic shut-off mechanism, which includes a flow cut-off unit, which is installed on the water inlet branch; the flow cut-off unit includes a flow pipe, which is connected to the water inlet branch; one end of the flow pipe is connected to a convex cavity, and a valve stem is slidably connected to the side wall of the convex cavity, a push-pull plate is fixedly connected to the valve stem disposed on the outside of the convex cavity, and a valve core is fixedly connected to the valve stem disposed on the inside of the convex cavity, and the valve core can form a sealing adaptation to the inner cavity of the flow pipe; the valve stem is connected to the convex cavity through an elastic component; the automatic shut-off mechanism also includes a driving unit, which is connected to the push-pull plate, and the driving unit is used to drive the push-pull plate away from or close to the convex cavity.

[0014] As one embodiment of the driving unit, the driving unit includes an electric telescopic rod, which is fixedly connected to the kettle cover, and a telescopic shaft of the electric telescopic rod is fixedly connected to the push-pull plate.

[0015] In a second aspect, the present invention discloses a chloroprene solution polymerization method, which is applied to the above-mentioned polymerization device, and the steps are as follows: S1, the material formed in the previous stage enters the inner cavity of the kettle through the feed port, the steering gear is started, and the steering gear is used to rotate the stirring shaft and the stirring blades, so as to stir the material in the kettle.

[0016] S2, adding initiator and terminator in sequence from the feed port according to the time period required in the process.

[0017] S3, start the circulation pump body, inject the chilled brine in the chilled brine storage tank into the water inlet branch, and the chilled brine flows through the water inlet loop, U-shaped delivery pipe, return loop, return branch in sequence and finally returns to the chilled brine storage tank.

[0018] The beneficial effects of the present invention are: Compared with the prior art, the present invention can effectively absorb and discharge the heat generated in the polymerization reaction by combining the annular tube, the heat dissipation pipe and the circulation pipeline, thereby solving the problem that the prior art does not disclose how to remove the heat of the polymerization reaction; at the same time, the heat dissipation pipe and the circulation pipeline are evenly distributed inside the kettle body, which can fully dissipate the heat of the polymerization reaction; and the setting of the stirring shaft and the stirring blades can improve the reaction efficiency of the polymerization reaction. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the three-dimensional structure of the polymerization device.

[0020] Figure 2 Schematic diagram of the internal structure of the polymerization device.

[0021] Figure 3 It is a schematic diagram of the three-dimensional structure of the cover.

[0022] Figure 4 This is a schematic diagram of the cross-section of the ring tube.

[0023] Figure 5 It is a schematic diagram of the assembly structure of a single heat dissipation pipeline and a circulation pipeline.

[0024] Figure 6 This is a schematic diagram of the first-person perspective assembly structure of the scraping mechanism.

[0025] Figure 7 This is a schematic diagram of the assembly structure of the scraping mechanism from the second perspective.

[0026] Figure 8 It is a schematic diagram of the three-dimensional structure of the telescopic scraper unit.

[0027] Fig. 9 It is a schematic diagram of the local structure of the present invention.

[0028] Fig.10 It is a schematic diagram of the local structure of the automatic cut-off mechanism.

[0029] Fig.11 Schematic diagram of the cross-sectional structure of the interception unit.

[0030] Fig.12 It is a schematic diagram of the installation structure of the second embodiment of the drive unit.

[0031] In the figure, 1, kettle body; 2, moving plate; 3, discharge port; 4, electric valve; 5, kettle cover; 6, barrel; 7, cover plate; 8, arch arm; 9, lock slot; 10, pull rod; 11, knob; 12, bracket; 13, steering gear; 14, stirring shaft; 15, stirring blade; 16, flange; 17, ring cylinder; 18, heat dissipation pipeline; 19, reinforcement rib; 20, water inlet loop; 21, return loop; 22, water inlet branch; 23, frozen brine storage tank; 24, three-way valve ; 25. Circulation pump body; 26. Return branch; 27. U-shaped delivery pipe; 28. Threaded shaft; 29. ​​Threaded sleeve; 30. Sliding body; 31. Sliding cavity; 32. Sliding sleeve; 33. Refrigeration pipeline; 34. Refrigeration equipment; 35. First one-way valve; 36. Second one-way valve; 37. Flow pipe; 38. Convex cavity; 39. Valve stem; 40. Push-pull plate; 41. Valve core; 42. Elastic component; 43. Toothed disc; 44. Transmission gear; 45. Stop beam; 46. Slide rail. DETAILED DESCRIPTION

[0032] In order to clearly understand the technical solution of the present application, a polymerization device and a chloroprene solution polymerization method provided by the present application will be described in detail below in combination with specific embodiments and drawings.

[0033] The terms used in the following embodiments are only for the purpose of describing specific embodiments, and are not intended to be used as limitations to the present application. As used in the specification and claims of the present application, the singular expressions "one", "a kind of", "above", "the" and "this" are intended to also include expressions such as "one or more", unless there is a clear indication to the contrary in the context. It should also be understood that in the following embodiments of the present application, "at least one", "one or more" refer to one, two or more than two.

[0034] References to "one embodiment" or "some embodiments" etc. described in this specification mean that a particular feature, structure or characteristic described in conjunction with the embodiment is included in one or more embodiments of the present application. Thus, the phrases "one embodiment", "in some embodiments", "in some other embodiments", "in some other embodiments", etc. appearing in different places in this specification do not necessarily all refer to the same embodiment, but mean "one or more but not all embodiments", unless otherwise specifically emphasized in other ways. The terms "including", "comprising", "having" and their variations all mean "including but not limited to", unless otherwise specifically emphasized in other ways.

[0035] Embodiment 1, this embodiment provides a polymerization device, referring to Figure 1-2 , Figure 1 is a schematic diagram of the three-dimensional structure of the polymerization device, and Figure 2The diagram shows the internal structure of the polymerization device. As can be seen from the above two figures, the polymerization device includes a kettle body 1, a discharge port 3 is formed at the bottom of the kettle body 1, and an electric valve 4 for discharging or cutting off the material is installed on the discharge port 3; a kettle cover 5 is installed on the top of the kettle body 1, and a feed port is formed on the kettle cover 5, and materials or initiators or terminators can be added from the feed port; in order to avoid the polymerization reaction being affected by external factors (such as impurities, air, etc.), a cover is required to be installed on the feed port; further combined with Figure 3 The schematic diagram of the three-dimensional structure of the cover is shown in the figure. The specific structure of the cover is as follows: the cover specifically includes a barrel 6, the bottom of the barrel 6 is connected to the feed port, and the top of the barrel 6 is equipped with a cover plate 7 in a snap-fit ​​manner; an arch arm 8 is fixedly connected to the top of the cover plate 7 by bolts, and one end of the arch arm 8 is hinged to the barrel 6; a lock groove 9 is formed on the other end of the arch arm 8, and a pull rod 10 is built in the lock groove 9; the pull rod 10 is rotatably connected to the flange on the outer wall of the barrel 6, and a knob 11 is threadedly connected to the free end of the pull rod 10; at the same time, it is defined that when the pull rod 10 is placed in the lock groove 9, the knob 11 is screwed on the pull rod 10 and the knob 11 is squeezed into contact with the lock groove 9. The material entering the kettle body 1 here mainly refers to the emulsified chloroprene solution generated in the previous process.

[0036] A bracket 12 is formed at the center of the top of the kettle cover 5, and a steering gear 13 is fixedly installed on the bracket 12. A stirring shaft 14 is coaxially fixedly connected to the output shaft of the steering gear 13. The stirring shaft 14 can rotatably pass through the kettle cover 5 and is placed in the inner cavity of the kettle body 1. Four groups of stirring blades 15 are formed on the stirring shaft 14 placed in the kettle body 1 at equal intervals from top to bottom (of course, according to actual needs, the number of groups of stirring blades 15 can also be set to other numbers); three flanges 16 (or other numbers) are connected to the periphery of the top of the kettle cover 5 in a circular array, and the flanges 16 are connected to the kettle body 1; a ring cylinder 17 is fixedly connected to the inner cavity of the flange 16, and further combined with Figure 4 The schematic diagram of the cutaway ring tube 17 shown in the figure shows that an opening is formed at the top of the ring cavity of the ring tube 17, and three heat dissipation pipes 18 are connected to the bottom of the ring cavity of the ring tube 17 in a circular array (of course, the heat dissipation pipes 18 can also be other numbers according to actual needs); in order to improve the force-bearing capacity of the above three heat dissipation pipes 18, reinforcing ribs 19 are connected between the three heat dissipation pipes 18.

[0037] Continue to combine Figure 4 and Figure 5 ,in, Figure 5 1 is a schematic diagram of the assembly structure of a single heat dissipation pipeline 18 and a circulation pipeline. It can be seen from the above two figures that a circulation pipeline is provided in the annular tube 17; specifically, the circulation pipeline includes a water inlet loop 20 and a water return loop 21, and the water inlet loop 20 and the water return loop 21 are arranged in the annular cavity of the annular tube 17 in an interval manner; and as shown in FIG. Fig. 9 As shown in the figure, the water inlet loop 20 is connected with a water inlet branch 22, and three water inlet branches 22 pass through the annular cylinder 17 and are connected with a three-way valve 24 on a frozen brine storage tank 23. A circulating pump body 25 for discharging frozen brine from the water inlet branch 22 is arranged in the frozen brine storage tank 23; the return water loop 21 is connected with a return water branch 26, and a single return water branch 26 passes through the corresponding annular cylinder 17 and is connected with the frozen brine storage tank 23; three U-shaped delivery pipes 27 are arranged at equal angles below the water inlet loop 20 and the return water loop 21, and one end of the single U-shaped delivery pipe 27 is connected with the water inlet loop 20, and the other end of the U-shaped delivery pipe 27 bypasses the side wall and bottom wall of the corresponding heat dissipation pipe 18 and is connected with the return water loop 21.

[0038] The general working principle of the polymerization device is as follows: first, the material formed in the previous stage enters the inner cavity of the kettle body 1 through the feed port, and at the same time, the steering gear 13 is started, and the stirring shaft 14 and the stirring blade 15 are rotated by the steering gear 13, so as to stir the material in the kettle body 1; on the other hand, the initiator and the terminator are added in sequence from the feed port according to the time period required in the process, so that the added material can fully realize the polymerization reaction; then, during the polymerization reaction of the material, heat will inevitably be generated. At this time, if Fig. 9 As shown in the figure, it is necessary to start the circulation pump body 25 to inject the chilled brine in the chilled brine storage tank 23 into the water inlet branch 22 along the a1 direction, so that the chilled brine flows through the water inlet loop 20, the U-shaped delivery pipe 27, the return water loop 21, the return water branch 26 in sequence and finally returns to the chilled brine storage tank 23 along the b1 direction. Through the continuous circulation of the chilled brine, the heat generated in the polymerization reaction is gradually carried out of the kettle body 1.

[0039] Compared with the prior art, the present invention can effectively absorb and discharge the heat generated in the polymerization reaction by combining the annular tube 17, the heat dissipation pipe 18 and the circulation pipeline, thereby solving the problem that the prior art does not disclose how to remove the heat of the polymerization reaction; at the same time, the heat dissipation pipe 18 and the circulation pipeline are evenly distributed inside the kettle body 1, which can fully dissipate the heat of the polymerization reaction; and the setting of the stirring shaft 14 and the stirring blade 15 can improve the reaction efficiency of the polymerization reaction.

[0040] During the polymerization process, the chloroprene solution gradually turns into a viscous state. It is inevitable that the chloroprene will adhere to the outer wall of the heat dissipation pipe 18, thereby affecting the heat dissipation effect of the circulation pipeline in the heat dissipation pipe 18. For this reason, the present invention designs the shape of the heat dissipation pipe 18 as follows: Figure 2 The shape of the heat dissipation pipe 18 is gradually bent outward from high to low, so as to facilitate the chloroprene to flow down from the heat dissipation pipe 18 and avoid a large amount of chloroprene from accumulating between and on the surface of the three heat dissipation pipes 18.

[0041] Although the shape of the heat dissipation pipe 18 can avoid the accumulation of chloroprene to the greatest extent, some chloroprene will still adhere to the heat dissipation pipe 18; therefore, in order to further improve the heat dissipation efficiency of the circulation pipeline in the heat dissipation pipe 18, it is necessary to further design a scraping mechanism, referring to Figure 6 , which shows a schematic diagram of the first-view assembly structure of the scraping mechanism. It can be seen from the figure that the scraping mechanism is connected to the heat dissipation pipe 18; the specific structure of the scraping mechanism is as follows.

[0042] Combination Figure 6-7 ,in, Figure 7 The second perspective assembly structure diagram of the scraping mechanism is shown. It can be seen from the above two figures that the scraping mechanism includes a telescopic scraping unit, a threaded shaft 28 is threadedly connected to the sliding end of the telescopic scraping unit, and three sliding sleeves 32 of the telescopic scraping unit are respectively connected to the adjacent heat dissipation pipes 18 in a sliding manner; the bottom of the threaded shaft 28 is connected to the reinforcing rib 19 in a rotational connection, and the top of the threaded shaft 28 is connected to the support seat on the flange 16 in a rotational connection. The threaded shaft 28 is connected to the output shaft of the steering gear 13 through a belt. When in use, the steering gear 13 is used to make its output shaft realize forward and reverse rotation, so that the stirring shaft 14 and the stirring blade 15 can fully stir the chloroprene in the forward and reverse rotation process; the threaded shaft 28 can also be reversed, and under the joint limiting action of the rotating threaded shaft 28 and the three heat dissipation pipes 18, the telescopic scraping unit can be lifted up and down on the heat dissipation pipe, so as to fully scrape the chloroprene bonded to the heat dissipation pipe. The more specific structure of the telescopic scraping unit is as follows.

[0043] refer to Figure 8 , which shows a schematic diagram of the three-dimensional structure of the telescopic scraper unit. It can be seen from the figure that the telescopic scraper unit includes a threaded sleeve 29, which is threadedly connected to the threaded shaft 28, and three sliding bodies 30 are formed at equal angles on the outer wall of the threaded sleeve 29; a sliding cavity 31 is slidably connected to a single sliding body 30, and a sliding sleeve 32 is fixedly connected to the free end of the sliding cavity 31, and the sliding sleeve 32 is slidably connected to the corresponding heat dissipation pipe 18.

[0044] The chilled brine returned from the return branch 26 to the chilled brine storage tank 23 has a higher temperature than the originally set temperature due to the absorption of heat. If the temperature of the chilled brine is adjusted in time, the original heat dissipation effect of the present invention is likely to be reduced. For this reason, the present invention makes the following optimizations.

[0045] refer to Fig. 9 , Fig. 9The diagram shows a partial structure of the present invention. It can be seen from the figure that the present invention also includes a refrigeration pipe 33, both ends of which are connected to the frozen brine storage tank 23, and a refrigeration device 34 (for example, a condenser of model fKFjejDP) is also installed on the refrigeration pipe 33; a first one-way valve 35 is provided on the return water branch 26, and the flow direction of the first one-way valve 35 is toward the frozen brine storage tank 23; a second one-way valve 36 is provided on the refrigeration pipe 33, and the flow direction of the second one-way valve 36 is away from the frozen brine storage tank 23. When in use, once the circulation pump body 25 is started, the refrigeration device 34 is also started accordingly, and at this time, part of the frozen brine branch flows out from the water inlet branch 22, and the other part of the branch flows into the refrigeration pipe 33 along the c1 direction and returns to the frozen brine storage tank 23 again after refrigeration, thereby ensuring that the frozen brine in the frozen brine storage tank 23 is maintained within a constant temperature range.

[0046] When the frozen brine that has absorbed heat returns to the frozen brine storage tank 23, in order to ensure that the frozen brine that has absorbed heat is sufficiently cooled again, it is necessary to timely intercept the frozen brine flowing out of the water inlet branch 22. After the frozen brine has cooled for a period of time, the frozen brine is allowed to flow out of the water inlet branch 22 again. For this purpose, the present invention designs an automatic shutoff mechanism, referring to Figure 9-10 ,in, Fig.10 The figure shows a partial structural diagram of the automatic cut-off mechanism. It can be seen from the above two figures that the automatic cut-off mechanism includes a cut-off unit, which is installed on the water inlet branch 22. Specifically, further combined with Fig.11 The schematic diagram of the cross-sectional structure of the intercepting unit shown in the figure, the intercepting unit includes a flow pipe 37, the flow pipe 37 is connected to the water inlet branch 22; one end of the flow pipe 37 is connected to a convex cavity 38, a valve stem 39 is slidably connected to the side wall of the convex cavity 38, a push-pull plate 40 is fixedly connected to the valve stem 39 disposed outside the convex cavity 38, and a valve core 41 is fixedly connected to the valve stem 39 disposed inside the convex cavity 38, and the valve core 41 can form a plugging adaptation to the inner cavity of the flow pipe 37; an elastic component 42 (such as a spring, etc.) is connected to the valve stem 39, and the other end of the elastic component 42 is connected to the convex cavity 38. The automatic shut-off mechanism also includes a driving unit, the driving unit is connected to the push-pull plate 40, and the driving unit is used to drive the push-pull plate 40 away from or close to the convex cavity 38, thereby indirectly realizing that the valve core 41 blocks or leaves the inner cavity of the flow pipe 37; the implementation methods of the driving unit are exemplified as follows, but are not limited to the following two implementation methods.

[0047] The first embodiment of the driving unit is: the driving unit includes an electric telescopic rod, which is fixedly connected to the kettle cover 5, and the telescopic shaft of the electric telescopic rod is fixedly connected to the push-pull plate 40; the electric telescopic rod is an existing product that can be purchased on the market, which will not be described here, and is not shown in the figure. When in use, the extension or retraction time of the corresponding electric telescopic rod can be set according to actual conditions; when the frozen brine returns to the frozen brine storage tank 23, the electric telescopic rod is started to indirectly drive the valve core 41 to block the flow pipe 37, so as to intercept the frozen brine flowing out of the water inlet branch 22; after the frozen brine is cooled for a period of time, the electric telescopic rod is used to indirectly drive the valve core 41 away from the flow pipe 37, and the frozen brine is allowed to flow out of the water inlet branch 22 again.

[0048] The second implementation of the drive unit is: Fig.12 , which shows a schematic diagram of the installation structure of the second embodiment of the drive unit. It can be seen from the figure that the drive unit includes a toothed disc 43, which is rotatably connected to the bracket 12 through a disc bearing, and a transmission gear 44 is concentrically fixedly connected to the threaded shaft 28. The transmission gear 44 and the toothed disc 43 form a meshing fit, and a stop beam 45 is formed on the toothed disc 43; a slide rail 46 is arranged below the stop beam 45, and a moving plate 2 is slidably connected to the slide rail 46, and a flange on one side of the moving plate 2 is fixedly connected to the push-pull plate 40; the stop beam 45 and the flange of the moving plate 2 form a shielding fit. When in use, the servo 13 can be made to continuously rotate back and forth by first moving forward and then moving backward, so that the flange of the retaining beam 45 and the movable plate 2 repeatedly switches between contact and separation. Therefore, in the process of the servo 13 driving the stirring shaft 14 to rotate, on the one hand, the scraping mechanism can be linked to realize the scraping action, and on the other hand, the push-pull plate 40 can be indirectly linked to move away from or close to the flow pipe 37 through the cooperation of the elastic component 42, so as to intercept or discharge the frozen brine flowing through the water inlet branch 22.

[0049] Example 2: This example provides a chloroprene solution polymerization method, using the polymerization device in Example 1, and the specific steps are as follows.

[0050] Step 1: the material formed in the previous stage enters the inner cavity of the kettle body 1 through the feed port, the steering gear 13 is started, and the steering gear 13 is used to rotate the stirring shaft 14 and the stirring blades 15, so as to stir the material in the kettle body 1.

[0051] Step 2, adding the initiator and terminator in sequence from the feed port according to the time period required in the process.

[0052] Step 3, start the circulation pump body 25, inject the chilled brine in the chilled brine storage tank 23 into the water inlet branch 22, so that the chilled brine flows through the water inlet loop 20, the U-shaped delivery pipe 27, the return loop 21, the return branch 26 in sequence and finally returns to the chilled brine storage tank 23.

Claims

1. A polymerization device, characterized in that: The invention comprises a kettle body (1), the kettle body (1) is provided with a discharge port (3), the discharge port (3) is provided with an electric valve (4) for discharging or shutting off the material; the top of the kettle body (1) is provided with a kettle cover (5), the kettle cover (5) is provided with a loading port, and a detachable cover is installed on the loading port; the top of the kettle cover (5) is fixedly connected to a steering gear (13) through a bracket (12), the output shaft of the steering gear (13) is coaxially fixedly connected to a stirring shaft (14), the stirring shaft (14) rotatably passes through the kettle cover (5) and is placed in the inner cavity of the kettle body (1), and is placed in the stirring body (1). More than two groups of stirring blades (15) are arranged on the shaft (14) in sequence from top to bottom; at least one flange (16) is fixedly connected to the top of the kettle cover (5), and the flange (16) is connected to the kettle body (1); a ring cylinder (17) is fixedly connected to the inner cavity of the flange (16), an opening is formed at the top of the ring cavity of the ring cylinder (17), and at least two heat dissipation pipes (18) are connected to the bottom of the ring cavity of the ring cylinder (17); a circulation pipeline is arranged in the ring cylinder (17), and flowing frozen brine is arranged in the circulation pipeline; and reinforcing ribs (19) are connected between adjacent heat dissipation pipes (18).

2. The polymerization device according to claim 1, characterized in that: The sealing cover comprises a barrel (6), the barrel (6) is connected to a feeding port, and a cover plate (7) is buckled on the top of the barrel (6); an arch arm (8) is fixedly connected to the cover plate (7), and one end of the arch arm (8) is hinged to the barrel (6); a locking groove (9) is formed on the other end of the arch arm (8), and a pull rod (10) is built in the locking groove (9); the pull rod (10) is rotatably connected to a flange on the outer wall of the barrel (6), and a knob (11) is provided on the free end of the pull rod (10); when the pull rod (10) is placed in the locking groove (9), the knob (11) is screwed on the pull rod (10) to make the knob (11) and the locking groove (9) come into extrusion contact.

3. The polymerization device according to claim 1, characterized in that: The circulation pipeline comprises a water inlet loop (20) and a water return loop (21), wherein the water inlet loop (20) and the water return loop (21) are arranged in the annular cavity of the annular cylinder (17); the water inlet loop (20) is connected to a water inlet branch (22), the water inlet branch (22) passes through the annular cylinder (17) and is connected to a frozen brine storage tank (23), and a circulation pump body (25) is arranged in the frozen brine storage tank (23); the water return loop (21) is connected to a water return branch (26), the water return branch (26) passes through the annular cylinder (17) and is connected to the frozen brine storage tank (23); one end of a single U-shaped delivery pipe (27) is connected to the water inlet loop (20), and the other end of the U-shaped delivery pipe (27) bypasses the side wall and the bottom wall of the corresponding heat dissipation pipeline (18) and is connected to the water return loop (21).

4. The polymerization device according to claim 1, characterized in that: The shape of the heat dissipation pipe (18) gradually bends outward from high to low.

5. The polymerization device according to claim 1, characterized in that: The scraping mechanism is also included, and the scraping mechanism is connected to the heat dissipation pipe (18); the scraping mechanism includes a telescopic scraping unit, and a threaded shaft (28) is threadedly connected to the sliding end of the telescopic scraping unit, and at least two sliding sleeves (32) of the telescopic scraping unit are respectively slidably connected to adjacent heat dissipation pipes (18); the bottom of the threaded shaft (28) is rotatably connected to the reinforcing rib (19), the top of the threaded shaft (28) is rotatably connected to the support seat on the flange (16), and the threaded shaft (28) is transmission-connected to the output shaft of the steering gear (13) via a belt.

6. The polymerization device according to claim 5, characterized in that: The telescopic scraper unit comprises a threaded sleeve (29), the threaded sleeve (29) and the threaded shaft (28) are threadedly connected, and at least two sliding bodies (30) are formed at equal angles on the outer wall of the threaded sleeve (29); a sliding cavity (31) is slidably connected to the single sliding body (30), a sliding sleeve (32) is fixedly connected to the free end of the sliding cavity (31), and the sliding sleeve (32) is slidably connected to the corresponding heat dissipation pipe (18).

7. The polymerization device according to claim 1, characterized in that: The invention also comprises a refrigeration pipeline (33), both ends of which are connected to the frozen brine storage tank (23), and a refrigeration device (34) is provided on the refrigeration pipeline (33); a first one-way valve (35) is provided on the return water branch (26), and the flow direction of the first one-way valve (35) is toward the frozen brine storage tank (23); and a second one-way valve (36) is provided on the refrigeration pipeline (33), and the flow direction of the second one-way valve (36) is away from the frozen brine storage tank (23).

8. The polymerization device according to claim 3, characterized in that: The automatic shutoff mechanism also includes an automatic shutoff mechanism, which includes a flow cutoff unit, which is mounted on the water inlet branch (22); the flow cutoff unit includes a flow pipe (37), which is connected to the water inlet branch (22); one end of the flow pipe (37) is connected to a convex cavity (38), a valve stem (39) is slidably connected to the side wall of the convex cavity (38), a push-pull plate (40) is fixedly connected to the valve stem (39) disposed outside the convex cavity (38), and a valve core (41) is fixedly connected to the valve stem (39) disposed inside the convex cavity (38), and the valve core (41) can form a sealing fit with the inner cavity of the flow pipe (37); the valve stem (39) is connected to the convex cavity (38) via an elastic component (42); the automatic shutoff mechanism also includes a drive unit, which is connected to the push-pull plate (40), and is used to drive the push-pull plate (40) to move away from or close to the convex cavity (38).

9. The polymerization device according to claim 8, characterized in that: The driving unit comprises an electric telescopic rod, which is fixedly connected to the kettle cover (5), and a telescopic shaft of the electric telescopic rod is fixedly connected to the push-pull plate (40).

10. A chloroprene solution polymerization method, characterized in that: Applied to the polymerization device of claim 1, the steps are as follows: S1, the material formed in the previous process section enters the inner cavity of the kettle body (1) through the feed inlet, the steering gear (13) is started, and the steering gear (13) is used to rotate the stirring shaft (14) and the stirring blade (15), thereby stirring the material in the kettle body (1); S2, adding the initiator and terminator in sequence from the feed port according to the time period required in the process; S3, starting the circulation pump body (25), injecting the chilled brine in the chilled brine storage tank (23) into the water inlet branch (22), and the chilled brine flows through the water inlet loop (20), the U-shaped delivery pipe (27), the return loop (21), the return branch (26) in sequence and finally returns to the chilled brine storage tank (23).

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