Tubular reactor for synthesizing reactive polyurethane prepolymer

Abstract

The technical scheme discloses a tubular reactor for reactive polyurethane prepolymer synthesis, the tubular reactor comprises a tube body and a second fixing plate, a kettle body is mounted on one side of the top of the second fixing plate, a valve is connected to the bottom end of the kettle body, an input pipe is connected to the right side of the valve, a metering pump is arranged on one side, close to the kettle body, of the input pipe, and the metering pump is connected to the bottom end of the kettle body. The other side of the input pipe is fixedly connected with a pipe body, the pipe body is provided with a driving motor, a driving shaft of the driving motor extends into the pipe body, the outer side wall of the pipe body is fixedly connected with a viscometer, the front end of the pipe body is fixedly connected with a material pump, and the bottom of the pipe body is connected with a conveying pipe. The other side of the conveying pipe is fixedly connected with a resin storage tank; a heating pipe is arranged on the outer side wall of the pipe body in a nested mode. According to the technical scheme, the synthetic process of the polyurethane prepolymer can be dynamically adjusted, sufficient and uniform reaction is promoted, quality guarantee is provided for continuous production of the polyurethane prepolymer, and meanwhile, the production efficiency of polyurethane is greatly improved.

Description

Technical Field

[0001] The utility model relates to the technical field of polyurethane resin processing, in particular to a tubular reactor for synthesizing reactive polyurethane prepolymers. Background Art

[0002] Reactive polyurethane coating technology utilizes controlled prepolymerization of two-component polyurethane monomers, without the use of any media, to generate a liquid resin. This resin is then applied to the surface of the base fabric and cured through in-situ polycondensation to create the imitation leather. The entire process is standardized, clean, and continuous, taking only tens of minutes and is virtually pollution-free. Because the process is solvent-free, the product is free of residual solvent, making it a typical green and environmentally friendly product.

[0003] Reactive polyurethanes are produced by the rapid reaction of various prepolymers containing terminal NCO groups and polymers containing terminal OH groups at high temperatures. The structure, composition, molecular weight, and molecular weight distribution of the liquid prepolymer determine the material's processing and end-use properties.

[0004] The synthesis of traditional polyurethane is usually completed in a reactor, and then the target product is synthesized by stirring and heating. At present, a reactor for polyurethane reaction has been published in China, including a tank body, a top plate fixedly connected to the top of the tank body, a drive motor provided on the upper side of the top plate, and a reaction mechanism provided inside the tank body. The reaction mechanism includes a main rod and a sealing cover, a first blade fixedly connected to the outer wall of the main rod, and a scraper fixedly connected to the end of the first blade away from the main rod. However, the stirring process of this structure still has uneven mass transfer and heat transfer, resulting in uneven molecular weight and distribution of the prepolymer, thereby affecting the processing performance of the resin and the performance of the material. Utility Model Content

[0005] The purpose of the utility model is to provide a tubular reactor for the synthesis of reactive polyurethane prepolymers, which can dynamically adjust the polyurethane prepolymer synthesis process, promote sufficient and uniform reaction, provide quality assurance for the continuous production of polyurethane prepolymers, and greatly improve the production efficiency of polyurethane.

[0006] A tubular reactor for synthesizing reactive polyurethane prepolymers comprises a tubular body and a second fixed plate, wherein a kettle is mounted on one side of the top of the second fixed plate, a valve is connected to the bottom end of the kettle, an input pipe is connected to the right side of the valve, a metering pump is provided on the side of the input pipe close to the kettle, and the other side of the input pipe is fixedly connected to the tubular body, the tubular body is equipped with a drive motor, a drive shaft of the drive motor extends within the tubular body, a viscometer is fixedly connected to the outer wall of the tubular body, a material pump is fixedly connected to the front end of the tubular body, a delivery pipe is connected to the bottom of the tubular body, and a resin storage tank is fixedly connected to the other side of the delivery pipe; a heating pipe is nested on the outer wall of the tubular body, a temperature sensor is provided on the tubular body, the temperature sensor is on the outside of the tubular body and a temperature measuring end is inserted into the tubular body; a drive shaft is provided within the tubular body, a stirring wheel is fixedly connected to the front end of the drive shaft, and a driving wheel is fixedly connected to the rear end of the drive shaft.

[0007] A temperature measuring element and a stirring element are provided in the kettle body, and at least one material receiving pipe is provided at the top of the kettle body.

[0008] The viscometer includes a connector, the upper end of which is fixedly connected to one end of a viscosity sensor head. The connector passes through the outer wall of the tube body and extends to the inner side and is fixedly connected to a rotor. The other end of the viscosity sensor head is connected to the PCL module for display.

[0009] The second fixing plate is connected to the first fixing plate, and the first fixing plate supports and fixes the resin storage tank.

[0010] An electromagnetic valve is provided at one end of the delivery pipe close to the resin storage tank.

[0011] The temperature sensor is connected to the outside of the pipe body by means of bolts.

[0012] The utility model has the following beneficial effects:

[0013] 1. The stirring device in the tube body can adjust the flow rate of the prepolymer resin and promote uniform mixing of the resin, which is convenient for automatic control of resin movement, conducive to continuous automatic production, and at the same time ensures the stability of the resin prepolymer reaction.

[0014] 2. The viscometer can be used to observe the changes in resin viscosity in real time and the PCL module can be used to adaptively adjust the temperature of the tube body to prevent the tube from being blocked due to too fast reaction and too high viscosity, or from being insufficiently reacted due to too low viscosity and resulting in stratification, thereby reducing the generation of by-products during the polyurethane prepolymer reaction process. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is the main structure diagram of the tubular reactor;

[0016] Figure 21 is a top view of the tubular body of the tubular reactor;

[0017] Figure 3 Schematic diagram of a stirring device inside a tubular reactor;

[0018] Figure 4 Schematic diagram of the viscometer for a tubular reactor.

[0019] in:

[0020] 1. First fixed plate; 2. Resin storage tank; 3. Tube body; 4. Kettle body; 5. Drive motor; 6. Temperature measuring element; 7. Valve; 8. Solenoid valve; 9. Metering pump; 10. Material pump; 11. Second fixed plate; 12. Input pipe; 13. Delivery pipe; 14. Material receiving pipe; 15. Viscometer; 16. Stirring element; 17. Stirring wheel; 18. Push wheel; 19. Drive shaft; 20. Rotor; 21. Connector; 22. Viscosity sensor head; 301. Heating tube; 302. Temperature sensor. DETAILED DESCRIPTION

[0021] Please refer to Figures 1 to 4 The tubular reactor for synthesizing a reactive polyurethane prepolymer shown in the figure is mainly designed with a kettle body 4, a metering pump 9, an input pipe 12, a pipe body 3, a stirring device composed of a stirring wheel 17 and a driving wheel 18, a driving motor 5, a viscometer 15, a heating pipe 301, a resin storage tank 2 and some corresponding accessories, such as a fixed plate, a temperature measuring component 6, a valve 7, etc.; in this case, the stirring device is designed to adjust the flow rate of the prepolymer resin and promote uniform mixing of the resin. At the same time, the viscometer 15 is designed to observe the change in resin viscosity in real time and use the PCL module to adaptively adjust the pipe body temperature to prevent the reaction from being too fast and the viscosity from being too high, which leads to blockage of the pipe mouth, or the viscosity from being too low and the reaction from being insufficient, which leads to stratification, etc., thereby reducing the generation of by-products in the polyurethane prepolymer reaction process.

[0022] A second fixing plate 11 is connected above the first fixing plate 1 in the figure, forming a framework structure that supports and secures the other components. A kettle 4 is mounted on one side of the top of the second fixing plate 11. A valve 7 is connected to the bottom of the kettle 4. An inlet pipe 12 is connected to the right side of the valve 7. A metering pump 9 is mounted on the side of the inlet pipe 12 near the kettle 4. The other side of the inlet pipe 12 is fixedly connected to the pipe 3. The material within the valve 4 enters the pipe 3 along the aforementioned path. A connecting plate can be sealed and mounted at the front end of the pipe 3. This connecting plate is a conventional structure and is not shown in the figure. The drive motor 5 is mounted on the connecting plate, and its drive shaft 19 extends into the pipe 3, thereby moving the material within the pipe 3. A viscometer 15, which is an existing component, is fixedly installed on the outer wall of the tube body 3. A material pump 10 is fixedly connected to the front end of the tube body 3. A delivery pipe 13 is connected to the bottom of the tube body 3. The other side of the delivery pipe 13 is fixedly connected to the resin storage tank 2. An electromagnetic valve 8 is installed at one end of the delivery pipe 13 close to the resin storage tank 2. Through the above arrangement, the material in the tube body 3 enters the resin storage tank 2 after processing. The above components realize dynamic adjustment of the polyurethane prepolymer synthesis process and promote sufficient and uniform reaction.

[0023] As shown in the figure, in order to heat the material in the tube body 3, a heating tube 301 is nested and installed on the outer wall of the tube body 3. At the same time, a temperature sensor 302 is provided on the tube body 3. The temperature sensor 302 is connected to the outer side of the tube body 3 by bolts, and the temperature measuring end is passed into the tube body 3. In this way, the resin reaction temperature can be effectively controlled to avoid uneven reaction or explosion caused by too low or too high temperature.

[0024] As shown in the figure, the kettle body 4 is installed with a temperature measuring module 6 and a stirring element 16 as conventional components, so that the temperature of the material in the valve body 4 can be measured and stirred; a material receiving pipe 14 is provided at the top of the kettle body 4 to achieve the dissolution and sufficient mixing of the raw materials, thereby ensuring the stability of the material after entering the tube body 3.

[0025] A drive shaft 19 is installed in the tube body 3 in the figure. The front end of the drive shaft 19 is fixedly connected to the stirring wheel 17, and the rear end of the drive shaft 19 is fixedly connected to the pushing wheel 18. The stirring wheel 17 and the pushing wheel 18 work together to achieve a synergistic effect on the uniform mixing of the resin.

[0026] The viscometer 15 shown is an existing component and includes a connector 21. A viscosity sensor head 22 is fixedly connected to the upper end of connector 21. Connector 21 extends through the outer wall of tube body 3 and into the inner side, where it is fixedly connected to rotor 20. As rotor 20 rotates within the raw material, the material exerts a viscosity torque on rotor 20. The greater the viscosity of the raw material, the greater the torque, and vice versa. The other end of viscosity sensor head 22 is connected to the PCL module display, allowing for real-time observation of changes in resin viscosity within the tube body and preventing side reactions.

[0027] The working principle of the above device is:

[0028] During use, the material receiving pipe 14 is connected to the vacuum dehydrator, while the material enters from another receiving pipe 14. The degassing device is turned on to discharge the water vapor in the kettle body 4 from the material receiving pipe 14. At the same time, the heater is turned on to heat it to ensure that the raw materials are completely dissolved. The stirring element 16 is used to stir and mix them. The temperature measurement module 6 is used to observe and adjust the material state to ensure that the materials are evenly mixed. The resin then flows from the metering pump 9 into the pipe body 3 through the valve 7 and the input pipe 12. The material entering the pipe body 3 flows under the drive of the material pump 10. The heating pipe 301 heats the raw materials. The driving motor 5 drives the stirring wheel 17 to promote the mixing of the two-component raw materials. The movement of the driving wheel 18 promotes the circulation of the polyurethane prepolymer in the pipe body, causing the polyurethane two-component prepolymer reaction to occur. The viscometer 15 monitors the changes in resin viscosity in real time and uses the PCL module to adaptively adjust the temperature of the pipe body 3. After the viscosity is completely stable, the solenoid valve 8 is opened to allow the reactive polyurethane prepolymer in the pipe body 3 to enter the resin storage tank 2, completing the material synthesis.

[0029] The specific embodiments described above are merely intended to explain the present technical solution and are not intended to limit the present technical solution. In the description of the present technical solution, it should be noted that terms such as "upper" and "inner" indicate positions or location relationships based on the positions or location relationships shown in the accompanying drawings. These terms are used solely to facilitate the description of the present technical solution and to simplify the description. They do not indicate or imply that the device or component referred to must have a specific position, be constructed, or operate in a specific position. Therefore, they should not be construed as limiting the present technical solution.

[0030] At the same time, it should be noted that in the description of this technical solution, unless otherwise explicitly specified or limited, the terms "fixed" and "matched" should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integral connection; they can refer to direct connection or indirect connection through an intermediate medium; they can refer to internal communication between two elements or interaction between two elements. For those skilled in the art, the specific meanings of the above terms in this technical solution can be understood according to specific circumstances.

[0031] Although embodiments of the present technical solution have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present technical solution, and the scope of the present technical solution is defined by the appended claims and their equivalents.

Claims

1. A tubular reactor for the synthesis of reactive polyurethane prepolymers, characterized in that: The invention comprises a tube body (3) and a second fixed plate (11), wherein a kettle body (4) is installed on one side of the top of the second fixed plate (11), the bottom end of the kettle body (4) is connected to a valve (7), the right side of the valve (7) is connected to an input pipe (12), a metering pump (9) is provided on the side of the input pipe (12) close to the kettle body (4), and the other side of the input pipe (12) is fixedly connected to the tube body (3), the tube body (3) is equipped with a drive motor (5), the drive shaft (19) of the drive motor (5) extends into the tube body (3), the outer wall of the tube body (3) is fixedly connected to a viscometer (15), and the tube body (3) is provided with a metering pump (9) on the side of the input pipe (12) close to the kettle body (4). The front end is fixedly connected to a material pump (10), the bottom of the tube body (3) is connected to a delivery pipe (13), and the other side of the delivery pipe (13) is fixedly connected to a resin storage tank (2); a heating pipe (301) is nested on the outer wall of the tube body (3), and a temperature sensor (302) is provided on the tube body (3), and the temperature sensor (302) is located outside the tube body (3) and the temperature measuring end is inserted into the tube body (3); a driving shaft (19) is provided in the tube body (3), the front end of the driving shaft (19) is fixedly connected to a stirring wheel (17), and the rear end of the driving shaft (19) is fixedly connected to a driving wheel (18).

2. The tubular reactor for synthesizing a reactive polyurethane prepolymer according to claim 1, wherein: A temperature measuring element (6) and a stirring element (16) are provided in the kettle body (4), and at least one material receiving pipe (14) is provided at the top end of the kettle body (4).

3. The tubular reactor for synthesizing a reactive polyurethane prepolymer according to claim 1, wherein: The viscometer (15) includes a connector (21), the upper end of which is fixedly connected to one end of a viscosity sensor head (22), the connector (21) passes through the outer wall of the tube body (3) and extends to the inner side and is fixedly connected to a rotor (20), and the other end of the viscosity sensor head (22) is connected to the PCL module display.

4. The tubular reactor for synthesizing a reactive polyurethane prepolymer according to claim 1, wherein: The second fixing plate (11) is connected to the first fixing plate (1), and the first fixing plate (1) supports and fixes the resin storage tank (2); an electromagnetic valve (8) is provided at one end of the delivery pipe (13) close to the resin storage tank (2).

5. The tubular reactor for synthesizing a reactive polyurethane prepolymer according to claim 1, wherein: The temperature sensor (302) is connected to the outside of the pipe body (3) using bolts.

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