A polymer emulsion polymerization apparatus

Abstract

This invention discloses a polymer emulsion polymerization apparatus, comprising a container body with a detachable cover at the top. A rotating shaft is mounted on the cover, passing through it and capable of rotating along its own axis. The rotating shaft includes a main shaft extending into the container body from the bottom, and a rod passing through the main shaft. The rod's axis is perpendicular to the main shaft's axis and can move along its own axis. A stirring plate is mounted at one end of the rod, and a counterweight is mounted at the other end. When the stirring plate is at its extreme position away from the main shaft, the end of the stirring plate away from the main shaft abuts against the inner wall of the container, and the end of the rod with the counterweight tends to rotate downwards. This invention provides a polymer emulsion polymerization apparatus that improves temperature control capabilities.

Description

Technical Field

[0001] This invention relates to the field of emulsion polymerization equipment technology, and more specifically, to a polymer emulsion polymerization apparatus. Background Technology

[0002] Polymer emulsion polymerization reactors typically employ anchor / frame stirrers to prevent excessive shear forces that could degrade micelle stability and hinder latex particle aggregation or demulsification. Shear forces are further controlled by maintaining low stirring speeds. Initially, to improve efficiency, the stirring speed (RPM) is controlled at around 300 rpm. Later, to reduce demulsification after polymerization, the RPM is reduced to 50-100 rpm. At lower stirring speeds, polymer tends to accumulate on the inner walls of the reaction vessel, forming deposits that affect heat transfer efficiency and hinder temperature control. Summary of the Invention

[0003] The purpose of this invention is to overcome the shortcomings of the prior art and provide a polymer emulsion polymerization apparatus that improves temperature control capability.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: a polymer emulsion polymerization apparatus, comprising a container body, a cover detachably mounted on the top of the container body, a rotating shaft mounted on the cover, the rotating shaft passing through the cover, and the rotating shaft being rotatable along its own axis; the rotating shaft includes a main shaft located at the bottom, the main shaft extending into the container body; it also includes a rod, the rod passing through the main shaft, the rod's axis being perpendicular to the main shaft's axis, the rod being rotatable along its own axis, a stirring plate mounted at one end of the rod, and a counterweight mounted at the other end; when the stirring plate is at its extreme position away from the main shaft, the end of the stirring plate away from the main shaft abuts against the inner wall of the container, and the end of the rod with the counterweight has a downward rotation tendency; it also includes a ring portion located below the cover, the ring portion being rotatable up and down, a magnetic component one mounted on the inner wall of the ring portion, and a magnetic component two mounted on the top of the counterweight; when the ring portion is at its lower extreme position, the magnetic component two and the magnetic component one are arranged opposite each other.

[0005] The present invention is further configured such that a linear bearing is installed on the inner wall of the main shaft, and the rod body includes a second rod portion, which passes through the linear bearing and is slidably connected to the linear bearing.

[0006] The present invention is further configured such that the rod body includes a rod portion three, and a counterweight is installed on the rod portion three.

[0007] The invention is further configured such that a retaining ring is installed on the outer wall of the rod, the retaining ring is located on the side of the main shaft away from the counterweight, and a spring is sleeved on the outer wall of the rod, one end of the spring abutting against the main shaft and the other end abutting against the retaining ring. When the first magnetic component is at the upper limit position, the second magnetic component is offset downward from the first magnetic component, and the stirring plate abuts against the inner wall of the container through the action of the spring.

[0008] The invention is further configured such that the main shaft body has a channel one, the channel one is located on the side of the main shaft body away from the counterweight, the rod body includes a rod part one, the rod part one can be inserted into the channel one, the channel one is a conical hole, and the rod part one is a cone shape that matches the wall of the channel one.

[0009] The present invention is further configured such that the stirring plate includes an extension plate located at the bottom, and the top of the extension plate is provided with a flow-guiding surface, which is arc-shaped.

[0010] The present invention is further configured such that multiple magnetic components are arranged circumferentially along the ring portion.

[0011] The invention is further configured such that a motor is mounted on the cover, the motor is connected to a gear pair, and the gear pair is connected to a rotating shaft.

[0012] The invention is further configured such that a bearing is installed on the inner wall of the cover, a rotating shaft is installed on the bearing, and the rotating shaft passes through the bearing.

[0013] In summary, the present invention has the following beneficial effects:

[0014] 1. By reducing the spindle speed, the centrifugal force on the counterweight side of the rod is reduced. Under the action of the spring, the stirring plate extends to abut against the inner wall of the container. As the stirring plate continues to rotate, it cleans the deposited fluid on the inner wall of the container, thereby ensuring the heat dissipation capacity of the container and improving the temperature control capability.

[0015] 2. The weight of the counterweight on one side of the rod is greater than that on the other side. Therefore, when the rod rotates, the centrifugal force on the side of the counterweight is greater, and the rod tends to move towards the side of the counterweight. This ensures that a stable distance is formed between the stirring plate and the inner wall of the container, so as to ensure appropriate shear force, improve mixing uniformity, and reduce the phenomenon of liquid adhering to the wall. Attached Figure Description

[0016] Figure 1 Cross-sectional view of the embodiment Figure 1 ;

[0017] Figure 2 for Figure 1 Enlarged view of point A in the middle;

[0018] Figure 3 for Figure 1 A partial sectional view along the MM direction;

[0019] Figure 4 This is a schematic diagram of the installation of the stirring plate in the embodiment;

[0020] Figure 5 Cross-sectional view of the embodiment Figure 2 ;

[0021] Figure 6 for Figure 5 Enlarged view of point B in the middle.

[0022] Reference numerals: Container body 1, Cover body 11, Motor 111, Gear pair 112, Drive component 113, Bearing 114, Rotating shaft 2, Main shaft body 21, Channel 1 211, Channel 2 212, Cylinder body 3, Ring 31, Magnetic component 1 311, Rod body 4, Rod 1 41, Rod 2 42, Rod 3 421, Groove body 43, Spring 44, Retaining ring 45, Stirring plate 5, Extension plate 51, Drainage surface 511, Counterweight 6, Magnetic component 2 61, Linear bearing 7. Detailed Implementation

[0023] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0024] like Figure 1 As shown, this embodiment discloses a polymer emulsion polymerization apparatus, including a container body 1. A cover 11 is detachably installed on the top of the container body 1. The cover 11 is fixedly installed. The container body 1 can move downwards to detach from the cover 11. After the container body 1 is fixed to the cover 11, the container body 1 is limited. The outer surface of the container body 1 dissipates heat by blowing air.

[0025] like Figure 1 As shown, a rotating shaft 2 is mounted on the cover 11, passing through the cover 11 and capable of rotating along its own axis. Specifically, a motor 111 is mounted on the upper end of the cover 11. The output shaft of the motor 111 is connected to a gear pair 112. One gear of the gear pair 112 is connected to the output shaft of the motor 111, and the other gear of the gear pair 112 is connected to the rotating shaft 2. The rotating shaft 2 is rotated under the drive of the motor 111. A bearing 114 is mounted on the inner wall of the cover 11, and the rotating shaft 2 is mounted on the bearing 114, passing through the bearing 114.

[0026] like Figure 1 As shown, a driving component 113 is also installed on the upper end of the cover 11. The driving component 113 is a cylinder. The output end of the driving component 113 passes through the cover 11 and is fitted with a cylinder 3. The cylinder 3 is located below the cover 11, and moves up and down under the drive of the driving component 113. The cylinder 3 includes a lower ring 31, and a magnetic component 311 is installed on the inner wall of the ring 31. Figure 3 As shown, multiple magnetic components 311 are arranged circumferentially along the ring portion 31.

[0027] like Figure 1As shown, the rotating shaft 2 includes a main shaft body 21 located below, which extends into the container body 1. A rod 4 is mounted on the main shaft body 21, passing through it. The main shaft body 21 is vertically oriented, and the rod 4 is perpendicular to the axis of the main shaft body 21. The rod 4 can move along its own axis. Specifically, as... Figure 2 As shown, the main shaft 21 has a second channel 212, on which a linear bearing 7 is fixedly installed. The rod 4 includes a second rod portion 42, which passes through the linear bearing 7 and is slidably connected to the linear bearing 7. A stirring plate 5 is installed at one end of the rod 4, and a counterweight 6 is installed at the other end. A magnetic component 61 is installed on the top of the counterweight 6. When the ring portion 31 is in its lower limit position, the magnetic component 61 and the magnetic component 311 are arranged opposite each other, and they move closer together under the mutual attraction of the magnetic component 61 and the magnetic component 311, so that... Figure 1 The rod 4 in the indicated position moves to the left to its leftmost extreme position, and the magnetic component 61 and magnetic component 311 remain separated. A retaining ring 45 is installed on the outer wall of the rod 4, located on the side of the main shaft 21 away from the counterweight 6. A spring 44 is fitted onto the outer wall of the rod 4, with one end of the spring abutting against the main shaft 21 and the other end abutting against the retaining ring 45. Figure 5 As shown, the rod body 4 includes a rod part 3 421, and a counterweight 6 is installed on the rod part 3 421. When the magnetic component 1 311 is at the upper limit position, the magnetic component 2 61 is offset downward from the magnetic component 1 311, and the stirring plate 5 abuts against the inner wall of the container body 1 through the action of the spring 44, thereby realizing the left and right movement of the rod body 4. Meanwhile, when the stirring plate 5 is at its extreme position far from the main shaft 21, the end of the stirring plate 5 away from the main shaft 21 abuts against the inner wall of the container 1, and the end of the rod 4 with the counterweight 6 installed tends to rotate downwards. That is, the weight of the counterweight 6 on one side of the rod 4 is greater than that on the other side. Therefore, when the rod 4 rotates, the centrifugal force on the side of the counterweight 6 is greater, and the rod 4 tends to move towards the side of the counterweight 6, thus ensuring that a gap is formed between the stirring plate 5 and the inner wall of the container 1. The size of the gap between the stirring plate 5 and the inner wall of the container 1 is 0.05-0.12 times the inner diameter of the container 1. In the early stage of the polymerization reaction, if the gap is too small and the main shaft 21 is kept at a speed of 300 rpm, it is easy to cause excessive local shear, increase energy consumption, and cause scraping between the stirring plate 5 and the inner wall of the container 1, which increases heat and is not conducive to controlling the reaction temperature. The scraping phenomenon at high speed also affects the service life of the stirring plate 5. When the distance between the stirring plate 5 and the inner wall of the container 1 is too large, a dead zone is easily formed on the inner wall of the container 1, resulting in uneven mixing. At the same time, the boundary layer on the inner wall of the container 1 thickens, the heat transfer efficiency decreases, and a low flow velocity zone is easily formed on the inner wall of the container 1, making it easier for fluid to adhere to the wall.

[0028] like Figure 2As shown, the main shaft 21 has a channel 211 located on the side of the main shaft 21 away from the counterweight 6. The rod 4 includes a rod portion 41, which can be inserted into the channel 211. The channel 211 is a tapered hole, and the rod portion 41 is tapered and matches the wall of the channel 211. When the stirring plate 5 is located closest to the main shaft 21, the rod portion 41 abuts against the wall of the channel 211, forming a limiting position. Figure 5 , Figure 6 As shown, when the counterweight 6 moves to the limit position close to the main shaft 21, the counterweight 6 abuts against the linear bearing 7, and the linear bearing 7 limits the counterweight 6. At this time, the stirring plate 5 abuts against the inner wall of the container body 1, thereby reducing the force between the stirring plate 5 and the inner wall of the container body 1, preventing the frictional resistance generated between the stirring plate 5 and the inner wall of the container body 1 from being too large and aggravating wear. However, it can ensure that the stirring plate 5 has a cleaning effect on the deposits on the inner wall of the container body 1, improve the mixing uniformity, and solve the problem of reduced heat dissipation caused by the deposits.

[0029] like Figure 4 As shown, the rod body 4 is provided with a groove 43, and the stirring plate 5 is inserted into the groove 43 and fixedly installed.

[0030] like Figure 1 As shown, the stirring plate 5 includes an extension plate 51 located at the bottom. The top of the extension plate 51 is provided with a flow-guiding surface 511, which is arc-shaped. The flow-guiding surface 511 forms a vertically flowing change in height along the radial direction of the main shaft 21. In order to reduce the stirring shear force, the stirring plate 5 adopts a semi-frame design. In order to improve the axial flow of the fluid, the flow-guiding surface 511 is provided, which is beneficial to the uniformity of mixing and mixing efficiency.

[0031] The specific usage method is as follows:

[0032] ① Install the container body 1 containing the polymer emulsion and the cap body 11.

[0033] ② The cylinder 3 moves downward to the lower limit position so that the magnetic component 311 moves downward synchronously. The magnetic component 311 magnetically attracts the magnetic component 61 to separate the stirring plate 5 from the inner wall of the container 1. The distance between the stirring plate 5 and the inner wall of the container 1 is 0.05-0.12 times the inner diameter of the container 1.

[0034] ③ Start the main shaft 21 to rotate, and the stirring plate 5 will rotate synchronously to generate stirring. The main shaft 21 rotates at a speed of 280-320 (unit: r / min, i.e., 300 RPM). By separating the stirring plate 5 from the inner wall of the container 1 before starting the main shaft 21, the friction between the stirring plate 5 and the inner wall of the container 1 during startup is effectively reduced, thus reducing wear.

[0035] ④ The cylinder 3 moves upward so that the magnetic component 311 and the magnetic component 61 are staggered vertically, reducing the rotational resistance of the main shaft 21 and reducing energy consumption. At this time, because the centrifugal force of the rod 4 is greater on the side of the counterweight 6, the rod 4 tends to move towards the side of the counterweight 6, thereby ensuring that a stable distance is formed between the stirring plate 5 and the inner wall of the container 1.

[0036] ⑤ After stirring for a certain period of time, the main shaft 21 reduces its speed to below 80 RPM, the centrifugal force of the rod 4 on the side of the counterweight 6 decreases, and the stirring plate 5 extends to abut against the inner wall of the container 1 under the action of the spring 44. As the stirring plate 5 continues to rotate, it cleans the deposited liquid on the inner wall of the container 1, thereby ensuring the heat dissipation capacity of the container 1 and improving the temperature control capacity.

[0037] The above description is merely a preferred embodiment of the present invention. The scope of protection of the present invention is not limited to the above embodiments. All technical solutions falling within the scope of the present invention's concept are within the scope of protection of the present invention. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principles of the present invention should also be considered within the scope of protection of the present invention.

Claims

1. A high polymer emulsion polymerization apparatus characterized by comprising: The utility model provides a container, including container body (1), the detachable installation of cover body (11) top of container body (1), the installation pivot (2) of cover body (11), the pivot (2) passes through cover body (11), pivot (2) can rotate along the own axis, The pivot (2) includes the main shaft body (21) below, the main shaft body (21) extends into the container body (1), the inner wall of the main shaft body (21) is installed with linear bearing (7); It also includes a rod body (4), the rod body (4) passes through the main shaft body (21), the rod body (4) is axially perpendicular to the main shaft body (21), the rod body (4) can move along the own axis, one end of the rod body (4) is installed with the stir plate (5), the other end is installed with the counterweight (6), when the stir plate (5) is located at the limit position away from the main shaft body (21), the stir plate (5) is away from the main shaft body (21) one end and the inner wall surface of the container body (1) abuts, and the rod body (4) is installed the counterweight (6) one end has the tendency of downward rotation, the rod body (4) includes the rod part two (42), the rod part two (42) passes through the linear bearing (7), the rod part two (42) is slidably connected with the linear bearing (7), the outer wall of the rod body (4) is installed with the blocking ring (45), the blocking ring (45) is located on the side of the main shaft body (21) away from the counterweight (6), the outer wall of the rod body (4) is sleeved with the spring (44), one end of the spring (44) abuts the main shaft body (21), the other end abuts the blocking ring (45); It also includes a ring part (31), the ring part (31) is located below the cover body (11), the ring part (31) can move up and down, the inner wall of the ring part (31) is installed with the magnetic component one (311), the top of the counterweight (6) is installed with the magnetic component two (61), when the ring part (31) is located at the lower end limit position, the magnetic component two (61) is arranged opposite inside and outside the magnetic component one (311), when the magnetic component one (311) is located at the upper end limit position, the magnetic component two (61) is staggered downward with the magnetic component one (311), the stir plate (5) abuts the inner wall surface of the container body (1) through the action of the spring (44).

2. The polymer emulsion polymerization apparatus according to claim 1, wherein The rod body (4) includes a rod part three (421), and the rod part three (421) is installed with the counterweight (6).

3. The polymer emulsion polymerization apparatus of claim 1, wherein The main shaft body (21) is provided with a channel one (211), the channel one (211) is located on the side of the main shaft body (21) away from the counterweight (6), the rod body (4) includes a rod part one (41), the rod part one (41) can be inserted into the channel one (211), the channel one (211) is a taper hole, and the rod part one (41) is a taper matched with the hole wall of the channel one (211).

4. The polymer emulsion polymerization apparatus of claim 1, wherein The stir plate (5) includes an extension plate (51) located at the bottom, and the top of the extension plate (51) is provided with a drainage surface (511), and the drainage surface (511) is arc-shaped.

5. The polymer emulsion polymerization apparatus of claim 1, wherein The magnetic component one (311) is provided with a plurality of magnetic components along the circumferential direction of the ring part (31).

6. The polymer emulsion polymerization apparatus of claim 1, wherein The cover (11) is provided with a motor (111), the motor (111) is connected with a gear pair (112), the gear pair (112) is connected with the rotating shaft (2).

7. The polymer emulsion polymerization apparatus of claim 1, wherein The inner wall of the cover (11) is provided with a bearing (114), the bearing (114) is provided with the rotating shaft (2), and the rotating shaft (2) penetrates the bearing (114).

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