Polymerization stirring device for producing chain-end functionalized solution polymerized styrene-butadiene rubber
The polymerization stirring device, designed with a frameless double-ribbon agitator and multi-layer conical baffles, solved the problems of gel formation and reactor blockage in the production of functionalized solution-polymerized styrene-butadiene rubber, achieving a highly efficient and stable production process and improving product quality and production efficiency.
Patent Information
- Application Number
- CN202520030722.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-07
- Publication Date
- 2025-12-16
- Estimated Expiration
- 2035-01-07
AI Technical Summary
The existing polymerization process for functionalized solution-polymerized styrene-butadiene rubber suffers from problems such as gel formation leading to unstable product quality and reactor blockage. Furthermore, traditional reactors are prone to forming insoluble, large molecules, which affects production efficiency and safety.
The polymerization mixing device, which employs a frameless double-ribbon agitator and a multi-layer conical baffle design, combined with a symmetrical frustum reactor structure and a dual-drive mixing system, ensures uniform mixing of materials and effective heat transfer, preventing gel formation and overheating polymerization.
It improves the uniformity of material mixing, shortens the reaction time, prevents gel formation and reactor blockage, enhances production efficiency and product quality stability, and realizes efficient production of functionalized solution-polymerized styrene-butadiene rubber.
Smart Images
Figure CN223669208U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to the technical field of chemical equipment, specifically, relates to a kind of polymerization stirring device for producing chain end functionalized solution polymerized styrene-butadiene rubber. BACKGROUND
[0002] Functionalized solution polymerized styrene-butadiene rubber is one of ideal materials for manufacturing high-performance green tires. It can well balance the relationship between high wear resistance, high wet skid resistance and low rolling resistance of tires, improve the comprehensive performance of tires, reduce the fuel consumption and exhaust emission of automobiles, and meet the requirements of modern automobile industry for environmental protection and energy saving.
[0003] However, there are two core problems in the continuous polymerization technology of functionalized solution polymerized styrene-butadiene rubber: one is the polymerization process, and the other is the reaction kettle. The continuous polymerization process currently used in industry mainly adopts kettle-type polymerization equipment. The reaction kettles on the market are used in the preparation of functionalized solution polymerized styrene-butadiene rubber in the production chain, which is easy to form insoluble macromolecules, i.e. gels. The traditional reaction kettle adopts a frame-type reaction kettle with shaft, and the formation of gels not only damages the performance of the polymer, causes unstable product quality and reduces production efficiency, but also easily causes the reaction kettle to be blocked after the accumulation of gels, which seriously affects the smooth progress of the reaction. SUMMARY
[0004] The problem solved by the utility model is the poor material mixing effect of the polymerization stirring device for preparing functionalized solution polymerized styrene-butadiene rubber and the problem of easy gel formation.
[0005] To solve the above problems, the utility model adopts the following technical scheme: a polymerization stirring device for producing chain end functionalized solution polymerized styrene-butadiene rubber, which comprises a polymerization kettle, a plurality of stirring pieces and a plurality of driving pieces. The polymerization kettle comprises a circular table kettle one and a circular table kettle two, the larger radius side of the circular table kettle one is connected with the larger radius side of the circular table kettle two, a plurality of conical baffles are arranged on the inner wall of the polymerization kettle, and the guide surface of the conical baffle is arranged towards the center line of the polymerization kettle. The stirring pieces are arranged at both ends of the inner wall of the polymerization kettle, the stirring pieces adopt shaftless frame-type double-screw stirrers, and the stirrers and the baffles are arranged alternately. Each driving piece is drivingly connected with a stirring piece.
[0006] Compared with the prior art, the technical effects achieved by the technical scheme are as follows: the shaftless frame type double-screw stirring device is adopted, and the stirring device is internally provided with a plurality of layers of baffles, the baffles can change the flow path and state of the material in the polymerization kettle, the conical baffle guide surface is arranged towards the center line of the polymerization kettle, the material is continuously guided to change the flow direction in the flow process, the up-down tumbling and transverse mixing of the material are promoted, the dead angle of the material being static or uneven mixing is avoided, the tangential flow generated in the stirring process of the double-screw stirring device is effectively inhibited, and in addition, each driving member is separately drivenly connected with a stirring member, the problem of the driving member being overloaded due to the colloidal styrene-butadiene rubber in the stirring process of the large polymerization kettle is avoided, the rotating speed of the stirring member is ensured, the material mixing effect is improved, and the rubber shaft seizure phenomenon is avoided.
[0007] Further, the first circular-truncated-cone kettle and the second circular-truncated-cone kettle are symmetrically arranged, the included angle between the slope generatrix of the first circular-truncated-cone kettle and the axis is α, and 12°≤α≤45°.
[0008] Compared with the prior art, the technical effects achieved by the technical scheme are as follows: when the first circular-truncated-cone kettle and the second circular-truncated-cone kettle are symmetrically arranged, the symmetrical structure is helpful to form a more uniform flow field in the polymerization reaction process. Due to the synergistic effect of the stirring member and the baffle, the flow state of the material in the two symmetrical circular-truncated-cone kettles is similar, and the local material flow being too fast or too slow due to the asymmetrical structure can be reduced. Meanwhile, when the material enters the middle section of the polymerization kettle, it is the widest part of the polymerization kettle, and it is also the time when the styrene-butadiene rubber reaction is most intense. The slope design of the first circular-truncated-cone kettle and the second circular-truncated-cone kettle can better release heat, so that the heat transfer of the reaction material is more efficient, and local overheating to cause explosion and other abnormal reactions is prevented. At the same time, the good material flow state also promotes the diffusion of monomers and initiators and other substances in the reaction system, improves the reaction efficiency, and shortens the time required for the polymerization reaction.
[0009] Further, the driving member includes a first driving member and a second driving member, and the stirring member includes a first stirring member and a second stirring member. The first driving member is arranged at the top center position of the polymerization kettle, and the second driving member is arranged at the bottom of the polymerization kettle. The first driving member drives the first stirring member, and the second driving member drives the second stirring member.
[0010] Compared with the prior art, the technical effects achieved by the technical scheme are as follows: the double-driving stirring is helpful to enhance the circulation of the material in the polymerization kettle and ensure the power of the stirring member in the large-capacity polymerization kettle.
[0011] Further, the shaftless frame type double-screw stirring device includes stirring screws, and two groups of stirring screws are arranged. The stirring screws are symmetrically arranged in the first circular-truncated-cone kettle and the second circular-truncated-cone kettle.
[0012] Compared with the prior art, the technical effects achieved by adopting the technical scheme are as follows: the uniform distribution of monomers such as butadiene and styrene and functional reagents in the polymerization kettle is the key to ensure that the polymerization reaction proceeds uniformly. The symmetrical arrangement of the stirring screw belts enables the material to be simultaneously pushed to the center and the edge of the polymerization kettle in the horizontal direction, avoiding the accumulation of the material on one side or uneven mixing, thereby improving the uniformity and consistency of the material mixing.
[0013] Further, the driving member is an electric motor; wherein the rotating speed of the stirring screw belt is 1200rpm-2200rpm.
[0014] Compared with the prior art, the technical effects achieved by adopting the technical scheme are as follows: the driving member adopts a high-power high-speed motor and stirring, which enables the raw materials to react quickly and improves the efficiency. Due to the design of the polymerization kettle round table, the phenomenon of explosive polymerization generated during the reaction of the raw materials is avoided, carbon reduction and energy efficiency are improved, and excessive shearing caused by excessive speed is also avoided, which causes the functionalized solution polymerized styrene butadiene rubber molecular chain to break, changes the molecular weight distribution of the product, and reduces the physical properties of the product.
[0015] Further, the number of layers of the conical baffle is 4-8; and / or the conical baffle is longitudinally and uniformly distributed along the inner wall of the round table kettle one and the round table kettle two.
[0016] Compared with the prior art, the technical effects achieved by adopting the technical scheme are as follows: the number of layers of the conical baffle is 4-8, and these multiple layers of conical baffles can guide and divide the flow of the material multiple times. During the polymerization process of the functionalized solution polymerized styrene butadiene rubber, the material flows under the driving of the stirring member, and when it encounters the conical baffle, its flow direction will change. Each layer of baffle will make the material produce a new flow path, increasing the mixing opportunity of the material. The multiple layers of conical baffles help to optimize the mass transfer in the reaction system. In the polymerization reaction, monomers, initiators and functional reagents and other substances need to fully diffuse in the reaction system to ensure efficient reaction. The presence of multiple layers of baffles enables the material to be constantly dispersed and recombined during flow, while the longitudinally and uniformly distributed conical baffles help to stabilize the flow field in the polymerization kettle, ensuring uniform mixing throughout the kettle.
[0017] Further, the polymerization kettle comprises a cooling layer, which is arranged close to the inner wall of the polymerization kettle.
[0018] Compared with existing technologies, the technical advantages achieved by this solution are as follows: The polymerization reaction of functionalized solution-polymerized styrene-butadiene rubber is an exothermic process. If heat cannot be removed in time during the reaction, the temperature of the reaction system will rise. The cooling layer, installed close to the inner wall of the polymerization reactor, can effectively absorb the heat generated by the reaction. Simultaneously, the presence of the cooling layer allows for more precise regulation of the reaction temperature. By controlling parameters such as the flow rate and temperature of the cooling medium, the reaction temperature can be controlled within an ideal range according to the requirements of the polymerization reaction.
[0019] Furthermore, the dynamic mixer also includes a feed inlet and a discharge outlet, with the feed inlet located at the bottom of the polymerization reactor and the discharge outlet located at the top of the polymerization reactor.
[0020] Compared with existing technologies, the technical advantages achieved by this solution are as follows: the feed inlet is located at the bottom of the polymerization reactor, which helps the raw materials to distribute better after entering the reactor and prevents splashing. The discharge outlet is located at the top of the polymerization reactor, and the functionalized solution-polymerized styrene-butadiene rubber product, after being fully mixed and reacted in the polymerization reaction, is discharged from the top.
[0021] Furthermore, the polymerization reactor has an inlet valve and an outlet valve, with the inlet valve located at the feed port and the outlet valve located at the discharge port.
[0022] Compared with existing technologies, the technical effects achieved by adopting this technical solution are as follows: by setting up inlet and outlet valves, combined with the setting of a cooling layer, the device is automated, ensuring the stable operation of the entire reaction.
[0023] Furthermore, the polymerization reactor is equipped with a temperature detector, which is located on the inner wall of the polymerization reactor and is used to detect the temperature of the polymer in the polymerization reactor.
[0024] Compared with existing technologies, the technical advantages achieved by this solution are as follows: By setting up a temperature monitoring and control system, multiple temperature sensors are installed inside the polymerization reactor to monitor the reaction temperature in real time and feed the signals back to the control system. When the temperature rises abnormally, the control system can automatically adjust the flow rate or temperature of the cooling medium to ensure that the polymerization reaction proceeds within a suitable temperature range. Attached Figure Description
[0025] Figure 1 This is a schematic diagram of a polymerization stirring device for producing chain-end functionalized solution-polymerized styrene-butadiene rubber according to an embodiment of the present invention.
[0026] Figure 2 for Figure 1 Enlarged view at point A;
[0027] Figure 3 for Figure 1 Enlarged view at point B.
[0028] Explanation of reference signs: 100 - polymerizer; 10 - round table kettle one; 11 - round table kettle two; 20 - first driving member; 21 - second driving member; 30 - stirring screw belt; 40 - conical baffle; 50 - feed port; 51 - discharge port; 52 - air inlet valve; 53 - air outlet valve; 60 - cooling layer. DETAILED DESCRIPTION
[0029] In order to make the above-mentioned purposes, features and advantages of the utility model more obvious and easy to understand, the specific embodiments of the utility model will be described in detail below with reference to the drawings.
[0030] Referring to Figures 1-3 , the utility model adopts the following technical scheme: a polymerization stirring device for producing chain end functionalized solution polymerized styrene-butadiene rubber, the polymerization stirring device comprises: a polymerizer 100, a plurality of stirring members and a plurality of driving members, the polymerizer 100 comprises a round table kettle one 10 and a round table kettle two 11, the side with large radius of the round table kettle one 10 and the side with large radius of the round table kettle two 11 are coincidentally connected, a plurality of conical baffles 40 are arranged on the inner wall of the polymerizer 100, and the guide surface of the conical baffle 40 is arranged towards the center line of the polymerizer 100; the stirring member is arranged at the both ends of the inner wall of the polymerizer 100, the stirring member adopts a shaftless frame type double screw belt stirrer, and the stirrer and the baffle are alternately arranged; each driving member is drivingly connected with a stirring member.
[0031] The shaftless frame type screw belt stirrer is adopted, and the stirring design with multiple built-in baffles is adopted, the baffle can change the flow path and state of the material in the polymerizer 100, the guide surface of the conical baffle 40 is arranged towards the center line of the polymerizer 100, so that the material is continuously guided to change the flow direction in the flow process, the up-down tumbling and horizontal mixing of the material are promoted, the dead angle of the material being static or uneven mixing is avoided, the tangential flow generated in the stirring process of the double screw belt stirrer is effectively inhibited, and in addition, each driving member is drivingly connected with a stirring member, the problem of driving member overload caused by solution polymerized styrene-butadiene rubber colloid in the stirring process of the large polymerizer 100 is avoided, the rotating speed of the stirring member is ensured, the mixing effect of the material is improved, and the occurrence of rubber shaft holding is avoided.
[0032] Specifically, referring to Figure 1 , the round table kettle one 10 and the round table kettle two 11 are symmetrically arranged, the included angle between the slope generatrix of the round table kettle one 10 and the axis is alpha, and 12°≤ alpha ≤ 45°.
[0033] When the conical kettle one 10 and the conical kettle two 11 are symmetrically arranged, the symmetrical structure is helpful to form a more uniform flow field during the polymerization reaction. Due to the synergistic effect of the stirring piece and the baffle, the flow state of the material in the two symmetrical conical kettles is similar, which can reduce the situation that the local material flows too fast or too slow due to the asymmetry of the structure. At the same time, when the material enters the middle section of the polymerization kettle 100, it is exactly the widest part of the polymerization kettle 100, and it is also the most intense time of the solution polymerized styrene-butadiene rubber reaction. The slope design of the conical kettle one 10 and the conical kettle two 11 can better release heat, so that the heat transfer of the reaction material is more efficient, and prevents local overheating from causing abnormal reactions such as explosion polymerization. At the same time, the good flow state of the material also promotes the diffusion of monomers and initiators and other substances in the reaction system, improves the reaction efficiency, and shortens the time required for the polymerization reaction.
[0034] Specifically, referring to Figure 1 , the driving piece includes a first driving piece 20 and a second driving piece 21, and the stirring piece includes a first stirring piece and a second stirring piece. The first driving piece 20 is arranged at the top center position of the polymerization kettle 100, and the second driving piece 21 is arranged at the bottom of the polymerization kettle 100. The first driving piece 20 drives the first stirring piece, and the second driving piece 21 drives the second stirring piece.
[0035] Double-drive stirring helps to enhance the circulation of the material in the polymerization kettle 100 and ensure the power of the stirring piece in the large-volume polymerization kettle 100.
[0036] Specifically, referring to Figure 1 , the shaftless frame type double-screw stirring device includes stirring screw belts 30, and two groups of stirring screw belts 30 are arranged. The stirring screw belts 30 are symmetrically arranged in the conical kettle one 10 and the conical kettle two 11.
[0037] Uniform distribution of monomers such as butadiene and styrene and functional reagents in the polymerization kettle 100 is the key to ensure uniform polymerization reaction. The symmetrical arrangement of the stirring screw belts 30 enables the material to be pushed to the center and edge of the polymerization kettle 100 at the same time in the horizontal direction, avoiding the accumulation of the material on one side or uneven mixing, thereby improving the uniformity and consistency of the material mixing.
[0038] Specifically, the driving piece adopts a motor; wherein the rotating speed of the stirring screw belt 30 is 1200 rpm-2200 rpm. For example, the driving piece adopts a high-power motor to ensure the rotating speed of the stirring screw belt 30.
[0039] The driving member adopts a high-power high-speed motor and stirring, so that the raw materials can react quickly and improve the efficiency. Due to the design of the conical table of the polymerization kettle 100, the phenomenon of explosive polymerization generated during the reaction of the raw materials is avoided, the carbon reduction and energy efficiency improvement are realized, and the excessive shear caused by excessive speed is also avoided, which causes the functionalized solution polymerized butadiene rubber molecular chain to break, changes the molecular weight distribution of the product, and reduces the physical properties of the product.
[0040] Specifically, referring to Figures 1-3 , the conical baffle 40 is arranged in 4-8 layers; and / or, the conical baffle 40 is longitudinally and uniformly distributed along the inner wall of the conical kettle one 10 and the conical kettle two 11.
[0041] The conical baffle 40 is preferably 6 layers, longitudinally and uniformly distributed along the inner wall of the conical kettle one 10 and the conical kettle two 11. These multiple layers of conical baffles 40 can guide and divide the flow of materials multiple times. During the polymerization of functionalized solution polymerized butadiene rubber, the materials flow under the drive of the stirring member, and when encountering the conical baffle 40, the flow direction will change. Each layer of baffle will cause the material to produce a new flow path, increasing the mixing opportunity of the material. The multiple layers of conical baffles 40 help to optimize the mass transfer in the reaction system. In the polymerization reaction, monomers, initiators and functionalization reagents and other substances need to be fully dispersed in the reaction system to ensure efficient reaction. The presence of multiple layers of baffles allows the material to be dispersed and recombined continuously during flow, while the longitudinally uniform distribution of the conical baffle 40 helps to stabilize the flow field in the polymerization kettle 100, ensuring uniform mixing throughout the kettle.
[0042] Specifically, referring to Figures 1-3 , the polymerization kettle 100 includes a cooling layer 60, which is arranged closely to the inner wall of the polymerization kettle 100. For example, the cooling layer 60 can adopt a jacketed structure, i.e. composed of inner and outer walls, and the cooling medium circulates in the jacketed space to efficiently remove reaction heat;
[0043] For another example, the cooling layer 60 can adopt a coil type structure, with cooling coils closely attached to the inner wall of the polymerization kettle 100 to increase the heat exchange area.
[0044] The polymerization reaction of functionalized solution polymerized butadiene rubber is an exothermic process. If the heat is not removed in time during the reaction, the temperature of the reaction system will rise. The cooling layer 60 is arranged closely to the inner wall of the polymerization kettle 100, which can effectively absorb the heat generated during the reaction. At the same time, the presence of the cooling layer 60 allows for more precise adjustment of the reaction temperature. By controlling the flow, temperature and other parameters of the cooling medium, the reaction temperature can be controlled within the desired range according to the requirements of the polymerization reaction.
[0045] Specifically, referring to Figures 1-3The dynamic mixer further comprises a feeding port 50 and a discharging port 51, the feeding port 50 is arranged at the bottom of the polymerization kettle 100, and the discharging port 51 is arranged at the top of the polymerization kettle 100.
[0046] The feeding port 50 is arranged at the bottom of the polymerization kettle 100, which is helpful for the raw materials to be better distributed after entering the polymerization kettle 100 and prevents the raw materials from splashing. The discharging port 51 is arranged at the top of the polymerization kettle 100, and the functionalized solution-polymerized styrene-butadiene rubber product after being fully mixed and reacted in the polymerization reaction is discharged from the top.
[0047] Specifically, referring to Figures 1-3 The polymerization kettle 100 is provided with an air inlet valve 52 and an air outlet valve 53, the air inlet valve 52 is arranged at the feeding port 50, and the air outlet valve 53 is arranged at the discharging port 51.
[0048] Through the arrangement of the air inlet valve 52 and the air outlet valve 53, combined with the arrangement of the cooling layer 60, the automation of the device is realized, and the stable operation of the whole reaction is ensured.
[0049] Specifically, referring to Figures 1-3 The polymerization kettle 100 is provided with a temperature detector, the temperature detector is arranged on the inner wall of the polymerization kettle 100, and the temperature detector is used for detecting the temperature of the polymer in the polymerization kettle 100.
[0050] Through the arrangement of the temperature monitoring and control system, a plurality of temperature sensors are arranged in the polymerization kettle 100, the reaction temperature is monitored in real time, and the signal is fed back to the control system.
[0051] Although the utility model discloses as above, the utility model is not limited to this. Any person skilled in the art, without departing from the spirit and scope of the utility model, can make various changes and modifications, therefore the protection scope of the utility model should be the range limited by the claims.
Claims
1. A polymerization agitator for producing chain-end functionalized solution styrene butadiene rubber, characterized by, The polymerization stirring device comprises: a polymerization kettle (100) comprising a round table kettle one (10) and a round table kettle two (11), the larger radius side of the round table kettle one (10) and the larger radius side of the round table kettle two (11) are coincidentally connected, a plurality of conical baffles (40) are arranged on the inner wall of the polymerization kettle (100), and the guide surface of the conical baffle (40) is arranged towards the center line of the polymerization kettle (100); a plurality of stirring pieces, the stirring pieces are arranged at both ends of the inner wall of the polymerization kettle (100), the stirring piece adopts a shaftless frame type double screw belt stirrer, and the shaftless frame type double screw belt stirrer is alternately arranged with the conical baffle (40); a plurality of driving pieces, each driving piece is drivingly connected with a stirring piece.
2. The polymeric stirring device of claim 1, wherein, The round table kettle one (10) and the round table kettle two (11) are symmetrically arranged, the included angle between the slope generatrix of the round table kettle one (10) and the axis is α, and 12°≤α≤45°.
3. The polymeric stirring device of claim 1, wherein, The driving piece comprises a first driving piece (20) and a second driving piece (21), the stirring piece comprises a first stirring piece and a second stirring piece, the first driving piece (20) is arranged at the top center position of the polymerization kettle (100), the second driving piece (21) is arranged at the bottom of the polymerization kettle (100), the first driving piece (20) drives the first stirring piece, and the second driving piece (21) drives the second stirring piece.
4. The polymeric stirring device of claim 3, wherein, The shaftless frame type double screw belt stirrer comprises stirring screw belts (30), two groups of stirring screw belts (30) are arranged, and the stirring screw belts (30) are symmetrically arranged on the round table kettle one (10) and the round table kettle two (11).
5. The polymeric stirring device of claim 4, wherein, The driving piece adopts a motor; wherein the rotating speed of the stirring screw belt (30) is 1200rpm-2200rpm.
6. The polymeric stirring device of claim 1, wherein, The conical baffle (40) is arranged in 4-8 layers; and / or The conical baffle (40) is uniformly distributed along the inner wall of the round table kettle one (10) and the round table kettle two (11) in the longitudinal direction.
7. The polymeric stirring device of claim 3, wherein, The polymerization kettle (100) comprises a cooling layer (60), and the cooling layer (60) is arranged close to the inner wall of the polymerization kettle (100).
8. The polymeric stirring device of claim 1, wherein, The polymerization stirring device further comprises a feeding port (50) and a discharging port (51), the feeding port (50) is arranged at the bottom of the polymerization kettle (100), and the discharging port (51) is arranged at the top of the polymerization kettle (100).
9. The polymeric stirring device of claim 8, wherein, The polymerization kettle (100) comprises an air inlet valve (52) and an air outlet valve (53), the air inlet valve (52) is arranged at the feeding port (50), and the air outlet valve (53) is arranged at the discharging port (51).
10. A polymeric mixing device according to any one of claims 1 to 9, wherein, The polymerization kettle (100) is provided with a temperature detector, the temperature detector is arranged on the inner wall of the polymerization kettle (100), and the temperature detector is used for detecting the temperature of the polymer in the polymerization kettle (100).