A styrene butadiene rubber (SBR) polymerization reactor structure

Abstract

A kind of butadiene styrene rubber SBR polymerization reactor structure, comprising: reaction kettle body, segmented temperature control system, multistage stirring system, feeding system, guide vane and discharge system, segmented temperature control system is connected with the outer wall of reaction kettle body, multistage stirring system is connected with the top end of reaction kettle body, feeding system is connected with the through connection of reaction kettle body, guide vane is located in segmented temperature control system, discharge system is connected with the bottom end of reaction kettle body.Wherein, segmented temperature control system includes: upper section jacket, middle section jacket, lower section jacket, upper section jacket circulation pipeline, middle section jacket circulation pipeline, lower section jacket circulation pipeline, circulating pump group, temperature controller, thermometer and solenoid valve.The utility model discloses compared with traditional technology, to the problem of heat control difficulty in the process of SBR polymerization, segmented temperature control is carried out, and with segmented temperature control as core, corresponding stirring feeding and stability problems in the process of butadiene styrene rubber synthesis are locally improved.

Description

Technical Field

[0001] This utility model relates to the field of lithium battery processing technology, specifically to a styrene-butadiene rubber (SBR) polymerization reactor structure. Background Technology

[0002] Styrene-butadiene rubber (SBR), as an important synthetic material, is widely used in key components of lithium-ion batteries, such as electrode binders and separator modification. Currently, battery-grade SBR is commonly produced in industrial production using emulsion polymerization in stirred reactors. However, traditional SBR polymerization reactors have many limitations: their single jacket design results in insufficient temperature control precision, failing to meet the differentiated temperature control requirements of different stages of battery-grade SBR polymerization—the initiation, growth, and termination phases; a significant temperature gradient forms between the upper and lower parts of the reactor, causing over-crosslinking of the polymer at the bottom and insufficient polymerization at the top; exothermic reactions are difficult to manage, often resulting in localized overheating or insufficient cooling; furthermore, the stirring system of traditional reactors typically uses a single type of impeller, which is difficult to adapt to the stirring requirements of different stages of the polymerization reaction, leading to uneven material mixing, large fluctuations in reaction conversion rate, and wide particle size distribution, especially with a significant decrease in stirring efficiency at high viscosity stages; temperature control and stirring problems force the process to reduce the reaction rate or extend the reaction time, thus prolonging the production cycle; inaccurate temperature control and uneven stirring directly affect the molecular weight distribution, emulsion particle size uniformity, and electrochemical stability of battery-grade SBR, thereby affecting the cycle performance and safety of lithium batteries; at the same time, traditional reactors are difficult to flexibly adjust according to the formulation requirements of different battery applications, resulting in poor process adaptability.

[0003] To address the aforementioned issues, we have made a series of improvements. Utility Model Content

[0004] The purpose of this invention is to provide a styrene-butadiene rubber (SBR) polymerization reactor structure to overcome the aforementioned shortcomings and deficiencies of the existing technology.

[0005] A styrene-butadiene rubber (SBR) polymerization reactor structure includes: a reactor body, a segmented temperature control system, a multi-stage stirring system, a feeding system, a guide plate, and a discharge system. The segmented temperature control system is connected to the outer wall of the reactor body, the multi-stage stirring system is connected to the top of the reactor body, the feeding system is connected through the reactor body, the guide plate is disposed within the segmented temperature control system, and the discharge system is connected to the bottom of the reactor body.

[0006] The segmented temperature control system includes: an upper jacket, a middle jacket, a lower jacket, circulation pipelines for the upper, middle, and lower jackets, a circulation pump set, a temperature controller, a thermometer, and a solenoid valve. The upper, middle, and lower jackets are connected to the outer wall of the reactor body from top to bottom. The circulation pipelines for the upper, middle, and lower jackets are respectively located within the upper, middle, and lower jackets. Solenoid valves are installed on the circulation pipelines for the upper, middle, and lower jackets. The circulation pipelines for the upper, middle, and lower jackets are connected to the heat transfer medium system through the circulation pump set. The temperature controller is connected to the thermometer and the solenoid valve.

[0007] Furthermore, the multi-stage mixing system includes: a variable-diameter mixing shaft, a propeller blade, an anchor blade, a ribbon blade, and a mixing motor. The variable-diameter mixing shaft includes an upper section shaft, a middle section shaft, and a lower section shaft, which are connected sequentially. The diameter of the upper section shaft is larger than that of the middle section shaft, and the diameter of the middle section shaft is larger than that of the lower section shaft. The propeller blade is connected to the upper section shaft, the anchor blade is connected to the middle section shaft, the ribbon blade is connected to the lower section shaft, and the mixing motor is connected to the variable-diameter mixing shaft.

[0008] The beneficial effects of this utility model are:

[0009] Compared with traditional technologies, this invention addresses the problem of heat control difficulties in the SBR polymerization process by implementing segmented temperature control. Furthermore, based on segmented temperature control, it makes localized improvements to the stirring, feeding, and stability issues in the synthesis of styrene-butadiene rubber. Attached image description:

[0010] Figure 1 This is a schematic diagram of the structure of this utility model.

[0011] Figure label:

[0012] The reactor body 100, the segmented temperature control system 200, the upper jacket 210, the middle jacket 220, the lower jacket 230, the upper jacket circulation pipeline 240, the middle jacket circulation pipeline 250, the lower jacket circulation pipeline 260, the circulation pump set 270, the temperature controller 280, the thermometer 290, and the solenoid valve 2100.

[0013] The system includes a multi-stage mixing system 300, a variable diameter mixing shaft 310, an upper shaft 311, a middle shaft 312, a lower shaft 313, a propeller blade 320, an anchor blade 330, a ribbon blade 340, and a mixing motor 350.

[0014] Feeding system 400, guide plate 500 and discharge system 600. Detailed Implementation

[0015] The present invention will be further described below with reference to specific embodiments. It should be understood that the following embodiments are for illustrative purposes only and are not intended to limit the scope of the present invention.

[0016] Example 1

[0017] Figure 1 This is a schematic diagram of the structure of this utility model.

[0018] like Figure 1 As shown, a styrene-butadiene rubber (SBR) polymerization reactor structure includes: a reactor body 100, a segmented temperature control system 200, a multi-stage stirring system 300, a feeding system 400, a guide plate 500, and a discharge system 600. The segmented temperature control system 200 is connected to the outer wall of the reactor body 100, the multi-stage stirring system 300 is connected to the top of the reactor body 100, the feeding system 400 is connected to the reactor body 100 in a through manner, the guide plate 500 is disposed inside the segmented temperature control system 200, and the discharge system 600 is connected to the bottom of the reactor body 100.

[0019] The segmented temperature control system 200 includes: an upper jacket 210, a middle jacket 220, a lower jacket 230, an upper jacket circulation pipeline 240, a middle jacket circulation pipeline 250, a lower jacket circulation pipeline 260, a circulation pump set 270, a temperature controller 280, a thermometer 290, and a solenoid valve 2100. The upper jacket 210, middle jacket 220, and lower jacket 230 are connected to the outer wall of the reactor body 100 from top to bottom. The upper jacket circulation pipeline 240, middle jacket circulation pipeline 250, and lower jacket circulation pipeline 260 are connected to the outer wall of the reactor body 100 from top to bottom. Pipeline 250 and lower jacket circulation pipeline 260 are respectively located in upper jacket 210, middle jacket 220 and lower jacket 230. Solenoid valves 2100 are installed on upper jacket circulation pipeline 240, middle jacket circulation pipeline 250 and lower jacket circulation pipeline 260. Upper jacket circulation pipeline 240, middle jacket circulation pipeline 250 and lower jacket circulation pipeline 260 are connected to the heat medium system through circulation pump set 270. Temperature controller 280 is connected to thermometer 290 and solenoid valve 2100.

[0020] The multi-stage mixing system 300 includes: a variable diameter mixing shaft 310, a propeller blade 320, an anchor blade 330, a ribbon blade 340, and a mixing motor 350. The variable diameter mixing shaft 310 includes: an upper shaft 311, a middle shaft 312, and a lower shaft 313, which are connected in sequence. The diameter of the upper shaft 311 is larger than that of the middle shaft 312, and the diameter of the middle shaft 312 is larger than that of the lower shaft 313. The propeller blade 320 is connected to the upper shaft 311, the anchor blade 330 is connected to the middle shaft 312, the ribbon blade 340 is connected to the lower shaft 313, and the mixing motor 350 is connected to the variable diameter mixing shaft 310.

[0021] The innovation of this invention lies in its segmented temperature control. The outer wall of the reactor is equipped with three independent zones: an upper jacket 210, a middle jacket 220, and a lower jacket 230. Each zone is equipped with an independent circulation pipeline: an upper jacket circulation pipeline 240, a middle jacket circulation pipeline 250, a lower jacket circulation pipeline 260, a circulation pump group 270, and a temperature controller 280. A closed-loop control system is formed through a thermometer 290 and a solenoid valve 2100. The lithium-ion battery-grade SBR polymerization reaction exhibits distinct stage characteristics: a higher temperature is required during the initiation phase to promote initiator decomposition; a moderate temperature is needed during the growth phase to control the polymerization rate; and a lower temperature is required during the termination phase to prevent excessive cross-linking. The segmented temperature control system can independently adjust the temperature of each zone according to the reaction state at different heights within the reactor, creating an optimal axial temperature gradient distribution. This enables precise temperature control in each region of the reactor, eliminating the temperature unevenness caused by traditional single jackets, ensuring that the lithium battery-grade SBR polymerization reaction proceeds under optimal temperature conditions, and avoiding excessive cross-linking caused by local overheating and insufficient polymerization caused by local low temperature.

[0022] The multi-stage stirring system employs a variable-diameter stirring shaft design, with the shaft diameter gradually decreasing from top to bottom. Different types of impellers—upper propeller, middle anchor, and lower ribbon—are positioned at different locations to form a three-dimensional stirring field. This design adapts to the changing viscosity of the materials during polymerization, providing omnidirectional and uniform stirring. The viscosity of the materials changes in stages during the polymerization reaction: axial circulation is needed in the initial low viscosity stage, radial shear is needed in the middle medium viscosity stage, and forced convection is needed in the later high viscosity stage. The propeller impeller 320 generates axial flow to promote material circulation, the anchor impeller 330 generates radial shear to improve mass and heat transfer, and the ribbon impeller 340 provides forced convection under high viscosity conditions. The variable-diameter shaft design allows the linear velocity of different zones to match the corresponding stirring requirements. This improvement creates a three-dimensional stirring field throughout the reactor, adapting to the changes in material viscosity during polymerization, achieving uniform stirring throughout the entire reaction cycle, improving the thorough mixing of reactants and reaction conversion rate, and maintaining effective stirring even in the high viscosity stage.

[0023] Integrated control scheme: The temperature controller 280, thermometer 290, and solenoid valve 2100 form an integrated control system, realizing coordinated control of segmented temperature control and multi-stage stirring. By monitoring the temperature of each zone in real time, the temperature controller automatically adjusts the opening of the solenoid valve and the flow rate of the circulating pump group to achieve independent temperature control of each jacket zone. At the same time, based on the reaction progress and temperature changes, it coordinates the operating parameters of the stirring system to ensure optimal matching between temperature control and stirring effect. This achieves precise temperature control and automated operation, reduces manual intervention, improves production stability and repeatability, and ensures the consistency of product quality for each batch.

[0024] The 500 guide vane is integrated within the segmented temperature control system, working in conjunction with the variable-diameter stirring shaft. The guide vane enhances the flow of the heat transfer medium within the jacket, improving the heat transfer coefficient; the variable-diameter shaft design reduces the load on the lower bearing, lowering stirring power consumption; and the combination of various blade configurations addresses the differentiated stirring requirements of different zones and stages of the reactor. This improves thermal efficiency, reduces energy consumption, enhances equipment operational stability and lifespan, and strengthens process adaptability, allowing for flexible adjustments based on different lithium-ion battery-grade SBR formulation requirements.

[0025] In summary, through the synergistic effect of segmented temperature control and multi-stage stirring, this invention can produce lithium battery-grade SBRs with narrower molecular weight distribution, more uniform emulsion particle size, and more stable electrochemical performance, directly improving the cycle performance and safety of lithium batteries, while shortening the production cycle, increasing production efficiency, and reducing energy consumption.

[0026] Compared with traditional technologies, this invention addresses the problem of heat control difficulties in the SBR polymerization process by implementing segmented temperature control. Furthermore, based on segmented temperature control, it makes localized improvements to the stirring, feeding, and stability issues in the synthesis of styrene-butadiene rubber.

[0027] The specific embodiments of this utility model have been described above, but this utility model is not limited thereto. Various changes can be made to this utility model as long as they do not depart from its spirit.

Claims

1. A structure for a styrene-butadiene rubber (SBR) polymerization reactor, characterized in that, include: The reactor body (100), segmented temperature control system (200), multi-stage stirring system (300), feeding system (400), baffle plate (500) and discharge system (600) are provided. The segmented temperature control system (200) is connected to the outer wall of the reactor body (100), the multi-stage stirring system (300) is connected to the top of the reactor body (100), the feeding system (400) is connected to the reactor body (100) in a through connection, the baffle plate (500) is located inside the segmented temperature control system (200), and the discharge system (600) is connected to the bottom of the reactor body (100). The segmented temperature control system (200) includes: an upper jacket (210), a middle jacket (220), a lower jacket (230), an upper jacket circulation pipeline (240), a middle jacket circulation pipeline (250), a lower jacket circulation pipeline (260), a circulation pump set (270), a temperature controller (280), a thermometer (290), and a solenoid valve (2100). The upper jacket (210), middle jacket (220), and lower jacket (230) are connected to the outer wall of the reactor body (100) from top to bottom. The upper jacket circulation pipeline (240), middle jacket circulation pipeline (250), and lower jacket circulation pipeline (260) are connected to the outer wall of the reactor body (100). Pipeline (250) and lower jacket circulation pipeline (260) are respectively located in upper jacket (210), middle jacket (220) and lower jacket (230). Solenoid valves (2100) are provided on the upper jacket circulation pipeline (240), middle jacket circulation pipeline (250) and lower jacket circulation pipeline (260). The upper jacket circulation pipeline (240), middle jacket circulation pipeline (250) and lower jacket circulation pipeline (260) are connected to the heat medium system through circulation pump set (270). The temperature controller (280) is connected to the thermometer (290) and the solenoid valve (2100).

2. The structure of a styrene-butadiene rubber SBR polymerization reactor according to claim 1, characterized in that, The multi-stage mixing system (300) includes: a variable-diameter mixing shaft (310), propeller blades (320), anchor blades (330), ribbon blades (340), and a mixing motor (350). The variable-diameter mixing shaft (310) includes: an upper shaft (311), a middle shaft (312), and a lower shaft (313), which are connected in sequence. The diameter of the upper shaft (311) is larger than that of the middle shaft (312), the diameter of the middle shaft (312) is larger than that of the lower shaft (313), the propulsion blade (320) is connected to the upper shaft (311), the anchor blade (330) is connected to the middle shaft (312), the ribbon blade (340) is connected to the lower shaft (313), and the stirring motor (350) is connected to the variable diameter stirring shaft (310).

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