Fine control reaction test device for emulsion polymerization process

Abstract

The utility model relates to an emulsion polymerization process fine control reaction test device which comprises a reaction kettle and a stirring shaft, a rotating shaft is arranged in the center of the stirring shaft and drives the stirring shaft to rotate through a gear transmission device, the rotating shaft and the stirring shaft coaxially rotate at different speeds, a cross-shaped paddle is arranged on the stirring shaft, and the stirring shaft rotates. The cross-shaped paddle can rotate in the axial direction along with the stirring shaft, a bevel gear transmission device is arranged between the rotating shaft and the cross-shaped paddle, and the bevel gear transmission device can convert rotation of the rotating shaft in the axial direction into rotation of the cross-shaped paddle in the direction perpendicular to the axial direction. The solution mixing device has the effect of improving the defects that the speed is low and the convection range is small during solution mixing.

Description

Technical Field

[0001] The present application relates to the field of emulsion polymerization, and in particular to a reaction test device for fine control of an emulsion polymerization process. Background Art

[0002] Emulsion polymerization is a polymerization method that uses the effect of emulsifiers to disperse monomers in water under stirring to form a latex, and then adds initiators and other chemical additives. Emulsion polymerization has the advantages of fast reaction speed, large molecular weight and stable reaction.

[0003] Common emulsion polymerization in related technologies is usually carried out in a reactor, which is provided with a stirring shaft and stirring blades. The stirring blades are horizontal blades fixed on the stirring shaft. During the stirring process, the stirring blades perform convective mixing in the horizontal direction.

[0004] With respect to the above-mentioned related technologies, the solution has the defect that the convection range is small and the speed is slow during mixing. Utility Model Content

[0005] In order to expand the reaction convection range and accelerate the reaction speed, the present application provides a reaction test device for fine control of the emulsion polymerization process.

[0006] The present application provides a device for finely controlling the reaction of an emulsion polymerization process, which adopts the following technical solution:

[0007] A device for finely controlling a reaction in an emulsion polymerization process comprises a reactor and a stirring shaft, wherein a paddle is arranged at the lower part of the stirring shaft, the stirring shaft is inside the reactor, the stirring shaft is a hollow structure, a rotating shaft is arranged in the middle of the stirring shaft, the rotating shaft and the stirring shaft are designed to be internally penetrated, the rotating shaft drives the stirring shaft to rotate through a gear transmission device, the rotating shaft and the stirring shaft rotate coaxially but at different speeds, a cross-shaped paddle is arranged on the stirring shaft, the cross-shaped paddle is in the middle part of the stirring shaft, a bevel gear transmission device is arranged between the stirring shaft and the cross-shaped paddle, the cross-shaped paddle is rotatably connected to the stirring shaft, and the cross-shaped paddle is perpendicular to the rotation axis of the stirring shaft compared to the rotation axis of the stirring shaft.

[0008] By adopting the above technical solution, the cross-shaped blades will rotate in the axial direction of the stirring shaft. There is a bevel gear transmission device between the stirring shaft and the cross-shaped blades. The bevel gear transmission device can convert the axial rotation of the rotating shaft into the rotation of the cross-shaped blades in a direction perpendicular to the axial direction, which can expand the range of convection and speed up the mixing of the solution.

[0009] Preferably, the gear transmission device includes a driving gear, a driven gear and a gear, the driving gear is fixed on the rotating shaft, the driving gear is coaxially fixed with the rotating shaft, a cover plate is provided on the upper part of the reactor, the driven gear is rotatably connected to the cover plate, the gear is opened on the inner wall of the stirring shaft, the driven gear is located between the driving gear and the gear, and the driven gear is meshed with the gear while meshing with the driving gear.

[0010] By adopting the above technical solution, the driving gear rotates with the rotating shaft, the driving gear drives the driven gear to rotate, and the driven gear drives the gear to rotate, thereby rotating the stirring shaft, and the asynchronous rotation of the stirring shaft and the rotating shaft can enable the bevel gear transmission device to rotate the cross-shaped blades under the action of a motor.

[0011] Preferably, the bevel gear transmission device comprises a driving bevel gear and a driven bevel gear, the driving bevel gear and the rotating shaft are coaxially fixed, the driven bevel gear and the driving bevel gear are meshed with each other, and a connecting shaft is provided between the driven bevel gear and the cross-shaped blade.

[0012] By adopting the above technical solution, the rotation of the active bevel gear in the axial direction will drive the driven bevel gear to rotate in a direction perpendicular to the axis of the rotating shaft. The driven bevel gear drives the cross-shaped blades to rotate in a direction perpendicular to the axis of the rotating shaft through the connecting shaft, thereby promoting vertical convection of the solution.

[0013] Preferably, a temperature sensor is provided on the rotating shaft, and the temperature sensor is located at the lower part of the rotating shaft.

[0014] By adopting the above technical solution, the temperature sensor can monitor the temperature in the solution, and the test can be adjusted according to the monitored temperature to ensure that the reaction is controlled at a more appropriate temperature, taking into account both the reaction rate and the average molecular weight of the polymer.

[0015] Preferably, one end of the connecting shaft is fixed on the driven bevel gear, the other end of the connecting shaft is provided with an internal spline, the cross blade is provided with an external spline, the external spline is on the side of the horizontal blade of the cross blade close to the stirring shaft, and the internal spline and the external spline are meshed with each other.

[0016] By adopting the above technical solution, there is an external spline on the connecting shaft, and the horizontal blades of the cross blades have external splines that mesh with the internal splines on the connecting shaft. The splines can withstand a large load, and the cross blades can be quickly disassembled through the splines, which is convenient for replacement and cleaning of the cross blades.

[0017] Preferably, a through hole is provided at the connection between the inner spline and the outer spline, and the through hole penetrates the connecting shaft and the cross-shaped blade perpendicular to the axis of the connecting shaft, and a pin is provided in the through hole, and the pin passes through the connecting shaft and the cross-shaped blade.

[0018] By adopting the above technical solution, through the provision of through holes and pins, the internal splines on the connecting shaft and the external splines on the cross blades can be prevented from disengaging during rotation, thereby playing a role in fixing the connecting shaft and the cross blades.

[0019] Preferably, the reactor comprises an inner layer and an outer layer, a cooling circulating water channel is provided between the inner layer and the outer layer of the reactor, a water inlet and a drain are provided on the reactor, the water inlet is arranged at the lower position of the reactor, the drain is arranged at the upper position of the reactor, and the water inlet and the drain are communicated with the circulating water channel.

[0020] By adopting the above technical solution, water is introduced from the water inlet, then water flows through the cooling circulating water channel and is discharged through the drain outlet. When the water is in the cooling circulating water channel, the water exchanges heat with the interior of the reactor to adjust the temperature of the material in the reactor.

[0021] Preferably, a bearing is provided between the rotating shaft and the stirring shaft, the inner ring of the bearing is sleeved on the rotating shaft, and the outer ring of the bearing is clamped on the inner wall of the stirring shaft.

[0022] By adopting the above technical solution, the rotating shaft and the stirring shaft can be taken out together, and the stirring component in the container is more convenient to clean after being taken out. At the same time, the reactor is also more convenient to clean after the stirring component is taken out.

[0023] In summary, the present application includes at least one of the following beneficial technical effects:

[0024] 1. Through the bevel gear transmission device, the cross-shaped blades can rotate in the axial direction and in the direction perpendicular to the axis, which can increase the range of convection and make the solution mix faster.

[0025] 2. The temperature of the solution system can be monitored by the temperature sensor, which is convenient for controlling the appropriate temperature for experimental operation.

[0026] 3. Through the gear transmission device, the rotating shaft and the stirring shaft can rotate coaxially at different speeds. The asynchronous rotation of the stirring shaft and the rotating shaft can enable the bevel gear transmission device to rotate the cross-shaped blades in different directions under the action of one motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a cross-sectional view of a test device for finely controlling the reaction of the emulsion polymerization process in an embodiment of the present application.

[0028] Figure 2 It is a schematic diagram of the installation position of the gear transmission device in the embodiment of the present application.

[0029] Figure 3 It is a schematic diagram of the installation position of the spline and the pin in the embodiment of the present application.

[0030] Explanation of the reference numerals in the accompanying drawings: 1. rotating shaft; 2. stirring shaft; 3. paddle; 4. cross-shaped paddle; 5. bevel gear transmission; 51. driving bevel gear; 52. driven bevel gear; 6. temperature sensor; 7. reactor; 71. inner layer; 72. outer layer; 8. connecting shaft; 9. gear transmission; 91. driving gear; 92. driven gear; 93. gear; 10. feed hole; 11. initiator inlet; 12. cover plate; 13. water inlet; 14. drain outlet; 151. inner spline; 152. outer spline; 16. through hole; 17. circulating water channel; 18. bearing; 19. pin. DETAILED DESCRIPTION

[0031] The following is combined with Figure 1-3 This application is described in further detail.

[0032] This embodiment discloses a device for finely controlling the reaction of an emulsion polymerization process. Figure 1 and Figure 2 , including a rotating shaft 1, a stirring shaft 2 and a reactor 7. The rotating shaft 1 and the stirring shaft 2 are arranged inside the reactor 7, the stirring shaft 2 is a hollow structure, the rotating shaft 1 and the stirring shaft 2 are designed to be inserted inside, and the center line of the rotating shaft 1 coincides with the center line of the stirring shaft 2, and a bearing 18 is installed between the rotating shaft 1 and the stirring shaft 2, the inner ring of the bearing 18 is fixed on the rotating shaft 1, and the outer ring of the bearing 18 is stuck on the inner wall of the stirring shaft 2. When lifted upward, the bearing 18 plays a role in fixing the positional relationship between the rotating shaft 1 and the stirring shaft 2, and the rotating shaft 1 and the stirring shaft 2 can be taken out from the reactor 7 together after the reaction is completed.

[0033] refer to Figure 1 and Figure 2A gear transmission device 9 is arranged between the rotating shaft 1 and the stirring shaft 2. The gear transmission device 9 includes a driving gear 91, a driven gear 92 and a gear 93. The driving gear 91 is on the rotating shaft 1. The driving gear 91 and the rotating shaft 1 are fixed coaxially. A cover plate 12 is arranged on the reactor 7. The cover plate 12 is above the reactor 7. The cover plate 12 plays the role of sealing the reactor 7. A motor is fixedly arranged on the outer side of the cover plate 12. The output shaft of the motor is fixed coaxially with the rotating shaft 1. The rotating shaft 1 is driven to rotate by the motor. A feed hole 10 and an initiator inlet 11 are provided on the cover plate 12 for adding raw materials and initiators. The driven gear 92 is rotatably connected to the cover plate 12. There are two driven gears 92 and the two driven gears 92 are symmetrically arranged on both sides of the rotating shaft 1. The driven gear 92 is between the driving gear 91 and the gear 93. The gear 93 is opened on the inner wall of the stirring shaft 2. The driven gear 92 is meshed with the driving gear 91 and the gear 93 at the same time. The rotation of the driving gear 91 drives the driven gears 92 on both sides to rotate, and the driven gear 92 drives the gear 93, and the gear 93 drives the stirring shaft 2 to rotate. The rotating shaft 1 and the stirring shaft 2 rotate coaxially at different speeds.

[0034] refer to Figure 1 and Figure 2 The stirring shaft 2 is connected with a paddle 3, which is located at the bottom of the stirring shaft 2. There are two paddles 3 and the two paddles 3 are symmetrically arranged about the stirring shaft 2. The paddles 3 and the stirring shaft 2 are integrally arranged or welded. There are cross-shaped paddles 4 on the stirring shaft 2. There are two cross-shaped paddles 4, which are symmetrically arranged about the stirring shaft 2. The cross-shaped paddles 4 are rotatably connected to the stirring shaft 2. The cross-shaped paddles 4 include horizontal blades and vertical blades. There is a bevel gear transmission device 5 between the cross blade 4 and the rotating shaft 1, and the bevel gear transmission device 5 includes a driving bevel gear 51 and a driven bevel gear 52. The driving bevel gear 51 and the rotating shaft 1 are coaxially fixed. There is a connecting shaft 8 between the cross blade 4 and the driven bevel gear 52. One end of the connecting shaft 8 is coaxially fixed with the driven bevel gear 52, and the other end of the connecting shaft 8 is used to install the cross blade 4. The cross blade 4 rotates horizontally under the drive of the stirring shaft 2. The rotation of the driving bevel gear 51 can drive the driven bevel gear 52 to rotate. The connecting shaft 8 rotates under the drive of the driven bevel gear 52, thereby driving the cross blade 4 to rotate perpendicular to the rotation axis of the stirring shaft 2, so that the solution can convect in the horizontal direction and the vertical direction at the same time, so that the stirring and mixing are more uniform and the stirring efficiency is higher.

[0035] refer to Figure 1 and Figure 3, an inner spline 151 is provided on the connecting shaft 8, an outer spline 152 is provided on the horizontal blade of the cross-shaped blade 4, the outer spline 152 is on the side close to the stirring shaft, and the inner spline 151 and the outer spline 152 cooperate with each other. A through hole 16 is provided at the connection between the inner spline 151 and the outer spline 152, and the through hole 16 penetrates the connecting shaft 8 and the cross-shaped blade 4 perpendicular to the axis of the connecting shaft 8, and a pin 19 is provided in the through hole 16, and the pin 19 passes through the connecting shaft 8 and the cross-shaped blade 4. The pin 19 can effectively prevent the inner spline 151 and the outer spline 152 from being separated during the rotation process, and the cross-shaped blade 4 can be quickly disassembled through the pin 19. The stirring shaft 2, the blade 3 and the cross-shaped blade 4 can also be taken out from the reactor 7 together after the reaction is completed, which is convenient for the replacement and cleaning of the stirring shaft 2, the blade 3 and the cross-shaped blade 4.

[0036] refer to Figure 1 The rotating shaft 1 is provided with a temperature sensor 6, which is located at the lower part of the rotating shaft 1. The temperature sensor 6 can be used to measure the temperature of the solution, which is conducive to monitoring the temperature of the solution through the temperature sensor 6 to ensure that the reaction is controlled at a more appropriate temperature, and can take into account the reaction rate and the average molecular weight of the polymer. The reactor 7 includes an inner layer 71 and an outer layer 72, and a circulating water channel 17 is provided between the inner layer 71 and the outer layer 72. The reactor 7 is provided with a water inlet 13 and a drain 14. The water inlet 13 is arranged at the lower part of the reactor 7, and the drain 14 is arranged at the upper part of the reactor 7. The water inlet 13 and the drain 14 are connected with the circulating water channel 17. The circulating water enters from the water inlet 13, gradually fills the circulating water channel 17, and then is discharged from the drain 14, which can take away the heat inside the reactor 7 during the water circulation process. At the same time, after the reaction is completed, since the water inlet 13 is located at the lower part of the reactor 7, it is also faster to discharge the water in the circulating water channel 17 from the water inlet 13.

[0037] The implementation principle of the embodiment is:

[0038] When the solution is added to the reactor 7, the motor is turned on, the driving gear 91 in the gear transmission device 9 will drive the driven gear 92, the driven gear 92 will drive the gear 93, the gear 93 will continue to drive the stirring shaft 2 to rotate, the blades 3 and the cross blades 4 will rotate horizontally with the stirring shaft 2, the rotating shaft 1 will drive the driving bevel gear 51 to rotate, the driving bevel gear 51 will drive the driven bevel gear 52 to rotate, the driven bevel gear 52 will drive the rotation of the connecting shaft 8, and further through the meshing of the internal spline 151 on the connecting shaft 8 and the external spline 152 on the cross blade 4, the cross blade 4 is driven to rotate in the vertical direction. Circulating water is injected from the water inlet 13, and the circulating water channel 17 is filled and discharged from the drain port 14. The temperature sensor 6 plays the role of monitoring the temperature. At the right time, feed is added through the feed hole 10 on the cover plate 12, and initiator is added through the initiator inlet 11 on the cover plate 12 until the reaction is complete. After the reaction is completed, the circulating water is discharged through the water inlet 13 until the water in the circulating water channel 17 is completely discharged, and the cross-shaped blade 4, the rotating shaft 1 and the stirring shaft 2 are taken out from the reactor 7 together. The cross-shaped blade 4 can be disassembled and cleaned through the pin 19.

[0039] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A device for finely controlling reaction of an emulsion polymerization process, comprising a reaction vessel (7) and a stirring shaft (2), wherein a paddle (3) is provided at the lower part of the stirring shaft (2), and characterized in that: The stirring shaft (2) is inside the reaction kettle (7). The stirring shaft (2) is of a hollow structure. A rotating shaft (1) is arranged in the middle of the stirring shaft (2). The rotating shaft (1) and the stirring shaft (2) are designed to be interpenetrating. The rotating shaft (1) drives the stirring shaft (2) to rotate via a gear transmission device (9). The rotating shaft (1) and the stirring shaft (2) rotate coaxially but at different speeds. A cross-shaped paddle (4) is arranged on the stirring shaft (2). The cross-shaped paddle (4) is located in the middle of the stirring shaft (2). A bevel gear transmission device (5) is arranged between the stirring shaft (2) and the cross-shaped paddle (4). The cross-shaped paddle (4) is rotatably connected to the stirring shaft (2), and the cross-shaped paddle (4) is perpendicular to the rotation axis of the stirring shaft (2) compared to the rotation axis of the stirring shaft (2).

2. The emulsion polymerization process fine control reaction test device according to claim 1, characterized in that: The gear transmission device (9) comprises a driving gear (91), a driven gear (92) and a gear (93); the driving gear (91) is coaxially fixed to the rotating shaft (1); the driving gear (91) is coaxially fixed to the rotating shaft (1); a cover plate (12) is provided on the upper part of the reaction kettle (7); the driven gear (92) is rotatably connected to the cover plate (12); the gear (93) is provided on the inner wall of the stirring shaft (2); the driven gear (92) is between the driving gear (91) and the gear (93); and the driven gear (92) is meshed with the gear (93) while meshing with the driving gear (91).

3. The emulsion polymerization process fine control reaction test device according to claim 1 or 2, characterized in that: The bevel gear transmission device (5) comprises a driving bevel gear (51) and a driven bevel gear (52); the driving bevel gear (51) and the rotating shaft (1) are coaxially fixed, the driven bevel gear (52) and the driving bevel gear (51) are meshed with each other, and a connecting shaft (8) is provided between the driven bevel gear (52) and the cross-shaped blade (4).

4. The emulsion polymerization process fine control reaction test device according to claim 1, characterized in that: A temperature sensor (6) is provided on the rotating shaft (1), and the temperature sensor (6) is located at the lower part of the rotating shaft (1).

5. The emulsion polymerization process fine control reaction test device according to claim 3, characterized in that: One end of the connecting shaft (8) is fixed to the driven bevel gear (52), and the other end of the connecting shaft (8) is provided with an internal spline (151). The cross-shaped blade (4) is provided with an external spline (152). The external spline (152) is located on a side of the horizontal blade of the cross-shaped blade close to the stirring shaft (2), and the internal spline (151) and the external spline (152) are meshed with each other.

6. The emulsion polymerization process fine control reaction test device according to claim 5, characterized in that: A through hole (16) is provided at the connection between the inner spline (151) and the outer spline (152), the through hole (16) penetrating the connecting shaft (8) and the cross-shaped blade (4) perpendicular to the axis of the connecting shaft (8), and a pin (19) is provided in the through hole (16), and the pin (19) passes through the connecting shaft (8) and the cross-shaped blade (4).

7. The emulsion polymerization process fine control reaction test device according to claim 1, characterized in that: The reactor (7) comprises an inner layer (71) and an outer layer (72), a cooling circulating water channel (17) is provided between the inner layer (71) and the outer layer (72), a water inlet (13) and a water outlet (14) are provided on the reactor (7), the water inlet (13) is provided at a lower position of the reactor (7), the water outlet (14) is provided at an upper position of the reactor (7), and the water inlet (13) and the water outlet (14) are communicated with the circulating water channel (17).

8. The emulsion polymerization process fine control reaction test device according to claim 1, characterized in that: A bearing (18) is provided between the rotating shaft (1) and the stirring shaft (2); the inner ring of the bearing (18) is sleeved on the rotating shaft (1), and the outer ring of the bearing (18) is clamped on the inner wall of the stirring shaft (2).

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