Vacuum defoaming kettle for production of high molecular thickening agent

Abstract

The utility model relates to high polymer material production equipment technical field, concretely relates to a vacuum defoaming kettle for high polymer thickening agent production. The utility model provides a vacuum defoaming kettle for high polymer thickening agent production, including kettle body, the drive motor and the vacuum extraction mouth of setting at the top of kettle body, the discharge gate of setting at the bottom of kettle body and the temperature control jacket of setting at the outside of kettle body, the inside of kettle body is provided with double -shaft allometric stirring system, the double -shaft allometric stirring system includes the coaxial setting inner shaft, outer shaft and the transmission mechanism for driving inner shaft and outer shaft differential rotation, the bottom of inner shaft is provided with high -speed dispersion disc, is provided with the anchor type wall scraping frame on outer shaft, the inner side edge of anchor type wall scraping frame is provided with the flexible scraper that contacts with kettle body inner wall. The temperature control jacket is the sectional structure, and temperature control jacket is wrapped at the bottom of kettle body and the 3 / 4 place of sidewall height.

Description

Technical Field

[0001] This utility model relates to the field of polymer material production equipment technology, specifically to a vacuum degassing kettle for the production of polymer thickeners. Background Technology

[0002] Polymer thickeners are a class of polymeric additives that significantly increase the viscosity of fluid systems through molecular chain entanglement or electrostatic interactions. They are widely used in products such as latex paints, sealants, and skincare products, and their core function is to improve the thixotropy, stability, and workability of the system. Vacuum degassing reactors are key equipment in the production of polymeric thickeners. By evacuating air from the reactor to create a vacuum environment, bubbles generated during stirring and reaction in the material are quickly released, preventing residual bubbles from causing uneven product appearance and decreased mechanical properties.

[0003] Existing vacuum degassing kettles have the following technical defects: First, the stirring blades of traditional single-shaft stirring systems can only drive local material flow, resulting in insufficient mixing of deep materials and difficulty in releasing bubbles from the material interior, leading to low degassing efficiency. Second, the temperature control jacket mostly adopts an integral structure, which cannot achieve precise temperature control of different areas of the kettle body (such as the bottom reaction zone, the middle mixing zone, and the top evaporation zone), easily leading to excessively high local temperatures that damage the thickener molecular chain structure, or excessively low temperatures that delay the reaction process. Third, the layout of the dispersion disc and the scraper frame is unreasonable, and the dispersion disc cannot effectively utilize the material circulation brought by the scraper, making it difficult to synergistically improve the dispersion effect and degassing efficiency. Utility Model Content

[0004] This invention addresses the problems mentioned above by providing a vacuum degassing kettle with a combined effect of dual-shaft variable-speed stirring and segmented temperature control, aiming to improve the degassing efficiency, temperature control accuracy, and equipment lifespan in the production of polymer thickeners.

[0005] The technical solution provided by this utility model is a vacuum degassing kettle for the production of polymer thickeners, including a kettle body, a drive motor and a vacuum port set at the top of the kettle body, a discharge port set at the bottom of the kettle body, and a temperature control jacket set on the outside of the kettle body. The kettle body is equipped with a dual-shaft variable speed stirring system. The dual-shaft differential speed stirring system includes an inner shaft and an outer shaft arranged coaxially, as well as a transmission mechanism for driving the inner shaft and the outer shaft to rotate at different speeds. The bottom end of the inner shaft is provided with a high-speed dispersion disk, and the outer shaft is provided with a wall scraping frame. The inner edge of the wall scraping frame is provided with a flexible scraper that contacts the inner wall of the vessel.

[0006] The temperature control jacket has a segmented structure and is wrapped around the bottom and three-quarters of the height of the side wall of the vessel.

[0007] As a preferred technical solution of this utility model, the transmission mechanism is a dual-output shaft reducer, with its high-speed output end connected to the inner shaft and its low-speed output end connected to the outer shaft. The connection ends of the dual-output shaft reducer with the inner shaft and the outer shaft are all connected by bevel gears to achieve 90° meshing transmission, and a protective cover is provided on the outside of the bevel gears.

[0008] As a preferred technical solution of this utility model, the high-speed dispersion disc is located inside the space enclosed by the scraping frame, and multiple dispersion plates with an angle of 10°-30° to the horizontal plane are arranged above the disc surface of the high-speed dispersion disc.

[0009] In a preferred embodiment of this invention, the temperature control jacket comprises an upper jacket, a middle jacket, and a lower jacket, sequentially separated along the axial direction of the vessel body. Each of the upper, middle, and lower jackets has an independent media inlet and outlet, both of which are connected to an external liquid supply system. A solenoid valve electrically connected to an external temperature control device is installed at both the media inlet and outlet.

[0010] As a preferred embodiment of this utility model, temperature sensors are respectively provided on the inner walls of the upper jacket, the middle jacket and the lower jacket, and are electrically connected to an external temperature control device.

[0011] As a preferred embodiment of this invention, the top of the vessel is provided with a manhole and a viewing window for maintenance.

[0012] As a preferred embodiment of this utility model, the discharge port is a discharge valve located at the bottom of the vessel body, and the discharge valve is selected as a ball valve or a gate valve.

[0013] The advantages of this utility model compared with the prior art are as follows: 1. Dual-shaft variable-speed stirring improves degassing and mixing efficiency: The inner shaft drives a high-speed dispersion disc (1000-2000 rpm) to achieve radial dispersion of materials, while the outer shaft drives a wall scraping frame (50-100 rpm) to simultaneously scrape off materials and deep bubbles from the vessel wall. The synergistic effect of the two solves the problems of "insufficient dispersion and difficulty in escaping bubbles" in traditional single-shaft stirring, and the degassing time is shortened by 30%-50%.

[0014] 2. Segmented temperature control ensures product performance: The temperature control jacket is divided into three independent areas: upper, middle and lower. The flow rate of the medium (hot water / cooling water) is regulated by an external liquid supply system and a solenoid valve. Combined with real-time feedback from a temperature sensor, the temperature of the vessel body can be precisely controlled within ±1℃, avoiding local temperature fluctuations that could damage the molecular structure of the thickener.

[0015] 3. Flexible scrapers extend equipment life: The flexible scrapers are made of polytetrafluoroethylene and make elastic contact with the vessel wall, which effectively removes material residues without scratching the inner wall, extending the service life of the equipment by 2-3 times.

[0016] 4. Structural optimization and ease of operation: The high-speed dispersion disc is located inside the scraper frame, which enhances the dispersion effect by utilizing the material circulation brought about by the scraper; the manhole and viewing window at the top of the vessel facilitate maintenance and operation observation, and the ball valve outlet at the bottom facilitates rapid material discharge. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of a vacuum degassing reactor for the production of polymer thickeners according to this utility model. Figure 1 .

[0018] Figure 2 This is a schematic diagram of the overall structure of a vacuum degassing reactor for the production of polymer thickeners according to this utility model. Figure 2 .

[0019] Figure 3 This is a cross-sectional three-dimensional structural diagram of a vacuum degassing kettle for the production of polymer thickeners according to this utility model.

[0020] Figure 4 This is an enlarged structural diagram of the transmission mechanism connection at point A of a vacuum degassing kettle used in the production of polymer thickeners according to this utility model.

[0021] As shown in the figure: 1. Reactor body; 2. Drive motor; 3. Vacuum port; 4. Discharge port; 5. Temperature control jacket; 6. Inner shaft; 7. Outer shaft; 8. Transmission mechanism; 9. High-speed dispersing disc; 10. Scraper frame; 11. Flexible scraper; 12. Bevel gear; 13. Protective cover; 14. Dispersing plate; 15. Upper jacket; 16. Middle jacket; 17. Lower jacket; 18. Medium inlet; 19. Medium outlet; 20. Temperature sensor; 21. Manhole; 22. Viewing window; 23. Feed inlet. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0023] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," and "connected," etc., should be interpreted broadly. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0024] Example 1: As per the instruction manual Figure 1-4 As shown, a vacuum degassing reactor for the production of polymer thickeners includes a reactor body 1, which is seamlessly welded from 304 stainless steel. The inner wall is polished (roughness Ra≤0.8μm) to reduce material adhesion. The drive motor 2 at the top of the reactor body 1 is a variable frequency speed control motor (power 5.5kW), and the vacuum port 3 is connected to an external rotary vane vacuum pump (ultimate vacuum degree ≤10Pa). A feed inlet 23 is provided on one side of the top of the reactor body 1, and the discharge port 4 at the bottom of the reactor body 1 is a stainless steel ball valve (nominal diameter DN50), and the material discharge speed can be controlled by the valve opening.

[0025] In this embodiment, the dual-shaft variable-speed stirring system consists of an inner shaft 6, an outer shaft 7, and a transmission mechanism 8. The transmission mechanism 8 uses a dual-output shaft reducer (model ZLYJ-630). The high-speed output end (1440 rpm) and the low-speed output end (144 rpm) are both meshed with the outer shaft 7 at 90° through a pair of helical bevel gears 12. A cast iron protective cover 13 is installed on the outside of the bevel gears 12 to prevent material splashing and damage to the gears. A stainless steel high-speed dispersion disc 9 (200 mm in diameter) is welded to the bottom of the inner shaft 6. Six dispersion plates 14 (made of 316L stainless steel) are evenly distributed above the surface of the dispersion disc. The dispersion plates 14 are at a 15° angle to the horizontal plane. The high-speed rotation throws the material toward the vessel wall, enhancing radial flow. A wall scraping frame 10 (anchor blade width 50 mm, gap with the vessel wall 2 mm) is fixed on the outer shaft 7. A flexible scraper 11 (made of polytetrafluoroethylene, thickness 10 mm) is connected to the inside of the frame by countersunk bolts. The scraper fits tightly with the inner wall of the vessel 1 but does not generate rigid friction.

[0026] In this embodiment, the temperature control jacket 5 is wrapped around the bottom and 3 / 4 of the height of the side wall of the vessel body 1, dividing it into three independent chambers: upper jacket 15, middle jacket 16, and lower jacket 17. Each jacket is equipped with a DN25 medium inlet 18 and a DN25 medium outlet 19, which are respectively connected to an external hot water tank and a cold water tank. Copper solenoid valves (model 2W-160-15) are installed at the medium inlet 18 and the outlet, which are electrically connected to an external PLC temperature control system. The medium flow rate is controlled by adjusting the valve opening. Pt100 temperature sensors 20 are uniformly welded on the inner side wall of the jacket. The sensor signals are transmitted to the temperature control system in real time to realize closed-loop temperature control of the vessel body 1.

[0027] In this embodiment, a DN500 manhole 21 (with a quick-opening flange) is provided on the top of the vessel body 1 to facilitate personnel to enter and inspect the mixing system; a tempered glass viewing window 22 is installed on the side to facilitate real-time observation of the material mixing and degassing status.

[0028] Working principle High-molecular-weight thickener raw material (such as acrylic copolymer emulsion) is added into the reactor body 1 through the feed inlet 23. Then, the drive motor 2 is turned on, and the dual-output shaft reducer (transmission mechanism 8) drives the inner shaft 6 to rotate at high speed (1500 rpm). The high-speed dispersion disk 9 disperses the material radially through the dispersion plate 14. At the same time, the outer shaft 7 rotates at low speed (100 rpm), and the wall scraping frame 10 drives the flexible scraper 11 to scrape off the material and air bubbles from the reactor wall. Then, the vacuum pump is started, and air is extracted from the reactor through the vacuum port 3 to make the internal vacuum reach 5 Pa, which promotes the escape of air bubbles inside the material.

[0029] During production, temperature sensor 20 monitors the temperature of the upper, middle and lower parts of the reactor body 1 in real time. The PLC system adjusts the opening of the solenoid valve according to the set value (such as 60℃): if the temperature of a certain area is lower than the set value, the medium inlet valve 18 of the corresponding jacket is opened to introduce hot water to raise the temperature; if it is higher than the set value, the medium outlet valve 19 is opened to introduce cold water to lower the temperature, so as to ensure that the temperature inside the reactor is uniform.

[0030] After degassing is complete (approximately 30 minutes), turn off the vacuum pump and drive motor 2, and open the bottom ball valve to discharge the material. During maintenance, enter the vessel body 1 through manhole 21 to check the wear of the stirring paddle and scraper, and observe through the viewing window 22 whether there is any material residue inside the vessel.

[0031] The present invention and its embodiments have been described above. This description is not restrictive, and the specific embodiments shown are only one of the embodiments of the present invention. The actual structure is not limited to this. In short, if a person skilled in the art is inspired by this description and designs a similar structure and embodiment without departing from the inventive spirit of the present invention, such design should fall within the protection scope of the present invention.

Claims

1. A vacuum degassing reactor for the production of polymer thickeners, comprising a reactor body (1), a drive motor (2) and a vacuum port (3) disposed at the top of the reactor body (1), a discharge port (4) disposed at the bottom of the reactor body (1), and a temperature control jacket (5) disposed on the outside of the reactor body (1), characterized in that: The vessel body (1) is equipped with a dual-axis variable speed stirring system; The dual-shaft differential speed stirring system includes an inner shaft (6) and an outer shaft (7) arranged coaxially, and a transmission mechanism (8) for driving the inner shaft (6) and the outer shaft (7) to rotate at different speeds. The bottom end of the inner shaft (6) is provided with a high-speed dispersion disk (9), and the outer shaft (7) is provided with a wall scraping frame (10). The inner edge of the wall scraping frame (10) is provided with a flexible scraper (11) that contacts the inner wall of the vessel body (1). The temperature control jacket (5) is a segmented structure, and the temperature control jacket (5) is wrapped around the bottom and 3 / 4 of the height of the side wall of the vessel body (1).

2. The vacuum degassing reactor for producing polymeric thickeners according to claim 1, characterized in that: The transmission mechanism (8) is a dual-output shaft reducer. Its high-speed output end is connected to the inner shaft (6), and its low-speed output end is connected to the outer shaft (7). The connection ends of the dual-output shaft reducer with the inner shaft (6) and the outer shaft (7) are all connected by bevel gears (12) to achieve 90° meshing transmission, and a protective cover (13) is provided on the outside of the bevel gears (12).

3. The vacuum degassing reactor for the production of polymeric thickeners according to claim 1, characterized in that: The high-speed dispersion disk (9) is located inside the space enclosed by the scraping frame (10), and multiple dispersion plates (14) with an angle of 10°-30° to the horizontal plane are set above the disk surface of the high-speed dispersion disk (9).

4. The vacuum degassing reactor for the production of polymeric thickeners according to claim 1, characterized in that: The temperature control jacket (5) includes an upper jacket (15), a middle jacket (16) and a lower jacket (17) that are sequentially separated along the axial direction of the vessel body (1). The upper jacket (15), the middle jacket (16) and the lower jacket (17) are respectively provided with independent media inlet (18) and media outlet (19). The media inlet (18) and the media outlet (19) are both connected to the external liquid supply system.

5. A vacuum degassing reactor for the production of polymeric thickeners according to claim 4, characterized in that: Temperature sensors (20) are respectively provided on the inner walls of the upper jacket (15), the middle jacket (16) and the lower jacket (17), and are electrically connected to external temperature control equipment.

6. A vacuum degassing reactor for the production of polymeric thickeners according to claim 1, characterized in that: The top of the vessel body (1) is provided with a manhole (21) for maintenance and a viewing window (22).

7. A vacuum degassing reactor for the production of polymeric thickeners according to claim 1, characterized in that: The discharge port (4) is a discharge valve located at the bottom of the vessel body (1), and the discharge valve is selected as a ball valve or a gate valve.

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