A flexible chain controllable polymerization reactor for melamine-formaldehyde resin polycondensation

Abstract

This utility model relates to melamine-formaldehyde resin production technology, and discloses a melamine-formaldehyde resin condensation reactor with flexible chain controllable polymerization, including a reactor body, a stirring device, a temperature control device, a feeding device, a flexible chain polymerization control device, and a discharging device; the stirring device includes a motor, a drive shaft, and a stirring paddle, with the motor installed above the reactor body and connected to the stirring paddle via the drive shaft; the temperature control device includes a heating jacket, a heating coil, and a temperature sensor located inside the reactor body; the feeding device includes a feeding pipe, a high-precision flow meter, an electric valve, and a feed inlet; the flexible chain polymerization control device includes a viscometer, an infrared spectrometer, a data processor, and a controller, with the viscometer and infrared spectrometer located inside the reactor body; the discharging device is located at the bottom of the reactor body and includes a sealing valve, a discharging pipe, a heat insulation layer, and a variable frequency delivery pump, with a heat insulation layer outside the discharging pipe and the variable frequency delivery pump installed on the discharging pipe.

Description

Technical Field

[0001] This utility model relates to the field of melamine-formaldehyde resin production technology, and more specifically, to a melamine-formaldehyde resin polycondensation reactor with flexible chain controllable polymerization. Background Technology

[0002] In the production of melamine-formaldehyde resin, controlling the degree of polymerization is crucial to product quality and performance. Traditional polycondensation reactors struggle to precisely control the degree of polymerization during the polymerization process, resulting in a wide molecular weight distribution, unstable performance, and difficulty in meeting the customized performance requirements of some special applications. Furthermore, existing reactors also suffer from insufficient mass and heat transfer during the reaction process, affecting reaction efficiency and product quality. Utility Model Content

[0003] This application provides a melamine-formaldehyde resin polycondensation reactor with flexible chain controllable polymerization, which solves the problems of traditional polycondensation reactors, which are difficult to precisely control the degree of polymerization of the reaction system during the polymerization process, resulting in unstable performance. In addition, the existing reactors also have insufficient mass transfer and heat transfer effects during the reaction process, which affect the reaction efficiency and product quality.

[0004] This application provides a melamine-formaldehyde resin polycondensation reactor with flexible chain controllable polymerization, including a reactor body, a stirring device, a temperature control device, a feeding device, a flexible chain polymerization control device, and a discharging device.

[0005] The stirring device includes a motor, a drive shaft, and a stirring paddle. The motor is installed above the vessel body and is connected to the stirring paddle via the drive shaft.

[0006] The temperature control device includes a heating jacket, a heating coil, and a temperature sensor located inside the inner cavity of the vessel, all disposed on the outer wall of the vessel.

[0007] The feeding device includes a feeding pipe, a high-precision flow meter, an electric valve, and a feeding port;

[0008] The flexible chain polymerization control device includes a viscometer, an infrared spectrometer, a data processor, and a controller, with the viscometer and the infrared spectrometer disposed inside the reactor.

[0009] The discharge device is located at the bottom of the vessel body. The discharge device includes a sealing valve, a discharge pipe, a heat insulation layer, and a variable frequency delivery pump. The heat insulation layer is provided outside the discharge pipe, and the variable frequency delivery pump is installed on the discharge pipe.

[0010] Preferably, the agitator has a multi-layer structure, comprising a central agitator and multiple lateral agitators.

[0011] Preferably, the feed pipe is made of heat-insulating material.

[0012] Preferably, the viscometer is a rotational viscometer, and the infrared spectrometer is a near-infrared spectrometer.

[0013] Preferably, a pressure sensor is provided inside the inner cavity of the vessel.

[0014] Preferably, the bottom of the vessel is equipped with support legs.

[0015] Preferably, one end of the discharge pipe is connected to a material conveying device.

[0016] As can be seen from the above technical solution, this application provides a melamine-formaldehyde resin condensation reactor for flexible chain controllable polymerization. During use, melamine, formaldehyde solution, and additives are added to the reactor in a set ratio via a feeding device. The multi-layered stirring paddles of the stirring device ensure thorough mixing of the materials, promoting the reaction. The temperature control device precisely adjusts the temperature inside the reactor based on feedback from the temperature sensor, maintaining the necessary reaction conditions. Simultaneously, the viscometer and infrared spectrometer in the flexible chain polymerization control device monitor changes in material viscosity and the intensity of characteristic absorption peaks of functional groups in real time. Based on this data and a pre-set polymerization degree control model, the data processor dynamically adjusts parameters such as the feed rate, stirring speed, and temperature through the controller, thereby achieving precise control of the polymerization reaction process and ensuring that the polymerization degree of melamine-formaldehyde resin is controllable, achieving the purpose of flexible chain controllable polymerization.

[0017] Compared with the prior art, the beneficial effects of this utility model are:

[0018] 1. This utility model achieves real-time monitoring and precise control of the polymerization reaction process by setting up detection devices such as viscometers and infrared spectrometers, as well as corresponding data processors and controllers. It can automatically adjust process parameters such as material addition, stirring speed and temperature according to the viscosity changes of the reaction system, thereby effectively controlling the degree of polymerization of melamine-formaldehyde resin, making the product molecular weight distribution narrower and the performance more stable.

[0019] 2. The stirring device of this utility model adopts a multi-layer design. The combination of the central stirring paddle and the side stirring paddle greatly improves the mixing uniformity of the reaction system, promotes full contact and reaction between monomers and between monomers and catalysts, improves the reaction rate and efficiency, and shortens the production cycle.

[0020] 3. The combination of the heating jacket, heating coil, and temperature sensor in the temperature control device of this utility model enables precise temperature control of the materials inside the reactor, ensuring that the reaction takes place in a suitable temperature environment, avoiding side reactions and uneven polymerization caused by temperature fluctuations, and further improving the quality of the product.

[0021] 4. The high-precision flow meter, electric valve, and heat preservation design of the feeding device of this utility model can accurately control the amount and speed of various materials added, ensuring the accurate proportion and reactivity of the reaction raw materials, which is conducive to the precise control of the flexible chain controllable polymerization process.

[0022] In summary, a flexible-chain controllable polymerization reactor for melamine-formaldehyde resin condensation polymerization, by incorporating detection devices such as viscometers and infrared spectrometers, along with corresponding data processors and controllers, achieves real-time monitoring and precise control of the polymerization process. It can automatically adjust process parameters such as material addition, stirring speed, and temperature based on changes in the viscosity of the reaction system, thereby effectively controlling the degree of polymerization of the melamine-formaldehyde resin, resulting in a narrower molecular weight distribution and more stable performance. Attached Figure Description

[0023] To more clearly illustrate the technical solution of this utility model, the drawings used in the embodiments will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without any creative effort.

[0024] Figure 1 A schematic diagram of the structure of a flexible chain controllable polymerization reactor for melamine-formaldehyde resin condensation.

[0025] Figure 2 A schematic diagram of the stirring device in a melamine-formaldehyde resin polycondensation reactor with flexible chain controllable polymerization provided by this utility model.

[0026] Figure 3 This is a schematic diagram of the structure of a melamine-formaldehyde resin polycondensation reactor with flexible chain controllable polymerization provided by this utility model.

[0027] The reference numerals in the detailed embodiments are as follows:

[0028] 1. Kettle body; 2. Stirring device; 201. Motor; 202. Drive shaft; 203. Stirring paddle; 2031. Central stirring paddle; 2032. Side stirring paddle; 3. Temperature control device; 301. Heating jacket; 302. Heating coil; 303. Temperature sensor; 4. Feeding device; 401. Feeding pipe; 402. High-precision flow meter; 403. Electric valve; 404. Feed inlet; 5. Flexible chain polymerization control device; 501. Viscometer; 502. Infrared spectrometer; 503. Data processor; 504. Controller; 6. Discharge device; 601. Sealing valve; 602. Discharge pipe; 603. Insulation layer; 604. Variable frequency conveying pump; 7. Pressure sensor; 8. Support leg; 9. Material conveying equipment. Detailed Implementation

[0029] To enable those skilled in the art to better understand the technical solutions of this utility model, the technical solutions in the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings.

[0030] See Figure 1-3 This application discloses a flexible-chain controllable polymerization reactor for melamine-formaldehyde resin polycondensation. To address the challenges of traditional polycondensation reactors, which struggle to precisely control the degree of polymerization and suffer from unstable performance, as well as insufficient mass and heat transfer in the reaction process, thus affecting reaction efficiency and product quality, this application proposes a flexible-chain controllable polymerization reactor for melamine-formaldehyde resin polycondensation. By incorporating detection devices such as viscometers and infrared spectrometers, along with corresponding data processors and controllers, real-time monitoring and precise control of the polymerization process are achieved. The reactor can automatically adjust process parameters such as material addition, stirring speed, and temperature based on changes in the viscosity of the reaction system, thereby effectively controlling the degree of polymerization of the melamine-formaldehyde resin, resulting in a narrower molecular weight distribution and more stable performance.

[0031] Specifically, a flexible chain controllable polymerization reactor for melamine-formaldehyde resin condensation includes a reactor body 1, a stirring device 2, a temperature control device 3, a feeding device 4, a flexible chain polymerization control device 5, and a discharging device 6. A pressure sensor 7 is installed inside the reactor body 1 to monitor the pressure inside the reactor body 1 in real time. Support legs 8 are installed at the bottom of the reactor body 1 to support it. The stirring device 2 includes a motor 201, a drive shaft 202, and a stirring paddle 203. The motor 201 is installed above the reactor body 1 and connected to the stirring paddle 203 via the drive shaft 202. The stirring paddle 203 has a multi-layer structure, including a central stirring paddle 2031 and multiple side stirring paddles 2032. Starting the motor 201 drives the stirring paddles 203 to perform multi-layer stirring, ensuring the material is fully and evenly mixed within the reactor body 1. The central stirring paddle 2031 forms a circulating flow of the material, and the side stirring paddles 203... 2. This ensures uniform distribution of materials in the horizontal direction, improves mass transfer, and promotes rapid reaction. Temperature control device 3 includes a heating jacket 301, a heating coil 302, and a temperature sensor 303 located inside the inner cavity of the vessel body 1, all installed on the outer wall of the vessel body 1. Based on the real-time temperature signal inside the vessel body 1 fed back by the temperature sensor 303, temperature control device 3 uses the flow rate and temperature of the heat medium in the heating jacket 301 and heating coil 302 to achieve precise heating or cooling of the materials inside the vessel body 1, strictly controlling the reaction temperature within the set range and providing a stable temperature environment for the reaction. Feeding device 4 includes a feeding pipe 401, a high-precision flow meter 402, an electric valve 403, and a feed port 404. The feeding pipe 401 is made of heat-insulating material. Melamine, formaldehyde solution, and other additives and catalysts are added to the vessel body 1 according to a pre-set ratio and speed through the feeding device 4.

[0032] The flexible chain polymerization control device 5 includes a viscometer 501, an infrared spectrometer 502, a data processor 503, and a controller 504. The viscometer 501 and infrared spectrometer 502 are installed inside the reactor body 1. The viscometer 501 is a rotary viscometer, and the infrared spectrometer 502 is a near-infrared spectrometer. The data processor 503 has built-in multiple polymerization degree control models, allowing selection of the appropriate model for controlling and optimizing the polymerization process according to actual production needs. The viscometer 501 and infrared spectrometer 502 monitor the viscosity changes and characteristic absorption peak intensity changes of specific functional groups in the reaction system in real time. This detection data is transmitted to the data processor 503 in real time. The data processor 503 analyzes and processes the viscosity and infrared spectral data according to the pre-set polymerization degree control model and process parameters to determine the reaction progress and molecular weight change trend. When the detected viscosity or functional group characteristic absorption peak intensity change reaches a set threshold or meets specific control model conditions, the controller 504 automatically issues commands to adjust the material addition amount and order of the feeding device 4, the rotation speed of the stirring device, and the temperature control device. The heating or cooling rate is dynamically adjusted in real time to achieve precise control of the flexible chain controllable polymerization process of melamine-formaldehyde resin, ensuring that the product has a uniform degree of polymerization and stable performance, and ensuring that the degree of polymerization of melamine-formaldehyde resin is controllable, thus achieving the purpose of flexible chain controllable polymerization. For example, in the early stage of polymerization, when the viscometer 501 detects that the viscosity of the material begins to rise and the infrared spectrometer 502 detects that the intensity of the characteristic absorption peak of formaldehyde gradually weakens, the data processor 503 judges that the polymerization reaction has started and entered the acceleration stage. At this time, the controller 504 will instruct the feeding device 4 to appropriately reduce the amount of formaldehyde solution added, and at the same time increase the speed of the stirring device 2 to prevent overpolymerization and local overheating, and ensure that the reaction proceeds smoothly. In the later stage of polymerization, when the viscosity reaches the set upper limit value or the change in the intensity of the characteristic absorption peak of the functional group indicates that the monomer conversion rate is close to the target value, the controller 504 will instruct the feeding device 4 to stop adding reaction raw materials, and adjust the temperature control device 3 to perform appropriate cooling operations, while reducing the stirring speed, so that the polymerization reaction gradually terminates and stabilizes within the required degree of polymerization range.

[0033] The discharge device 6 is located at the bottom of the reactor body 1. The discharge device 6 includes a sealing valve 601, a discharge pipe 602, an insulation layer 603, and a variable frequency conveying pump 604. Throughout the production process, the sealing valve 601 of the discharge device 6 remains closed to prevent material leakage. After the reaction is completed, the sealing valve 601 of the discharge device 6 is opened. The discharge pipe 602 is equipped with an insulation layer 603, which ensures that the material will not condense and block due to temperature drop during the conveying process, thus ensuring the smooth progress of the discharge process. The variable frequency conveying pump 604 is installed on the discharge pipe 602. The variable frequency conveying pump 604 automatically adjusts the discharge speed according to the viscosity and flow rate requirements of the material in the reactor body 1, so as to smoothly discharge the melamine-formaldehyde resin product out of the reactor body 1. One end of the discharge pipe 602 is connected to the material conveying equipment 9, and the product enters the material conveying equipment 9 through the discharge pipe 602.

[0034] As can be seen from the above technical solution, in the use of a flexible chain controllable polymerization melamine-formaldehyde resin polycondensation reactor, melamine, formaldehyde solution, and additives are added to the reactor body 1 in a set ratio through the feeding device 4. The multi-layer stirring paddle 203 of the stirring device 2 ensures thorough mixing of the materials and promotes the reaction. The temperature control device 3, based on feedback from the temperature sensor 303, precisely adjusts the temperature inside the reactor body 1 to maintain the required reaction conditions. Simultaneously, the viscometer 501 and infrared spectrometer 502 in the flexible chain polymerization control device 5 monitor the changes in material viscosity and functional group characteristic absorption peak intensity in real time. Based on these data and combined with a pre-set polymerization degree control model, the data processor 503 controls the reaction through the controller 504. By dynamically adjusting parameters such as feed rate, stirring speed, and temperature, the polymerization process can be precisely controlled, ensuring that the degree of polymerization of melamine-formaldehyde resin is controllable and achieving the goal of controllable polymerization of flexible chains. Throughout the production process, the sealing valve 601 of the discharge device 6 remains closed to prevent material leakage. After the reaction is completed, the sealing valve 601 of the discharge device 6 is opened, and the variable frequency conveying pump 604 automatically adjusts the discharge speed according to the viscosity and flow requirements of the material in the reactor 1, smoothly discharging the melamine-formaldehyde resin product out of the reactor 1. The insulation layer 603 of the discharge pipe 602 ensures that the material will not condense and blockage due to temperature drop during the transportation process, ensuring the smooth progress of the discharge process.

[0035] Other embodiments of the present invention will readily occur to those skilled in the art upon consideration of the specification and practice of the applications disclosed herein. The present invention is intended to cover any variations, uses, or adaptations of the invention that follow the general principles of the invention and incorporate common knowledge or customary techniques in the art disclosed herein. The specification and examples are to be considered exemplary only, and the true scope of the invention is indicated by the claims.

[0036] It should be understood that this utility model is not limited to the precise structure described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The embodiments of this utility model described above do not constitute a limitation on the scope of protection of this utility model.

Claims

1. A flexible chain controllable polymerization reactor for melamine-formaldehyde resin polycondensation, characterized in that: It includes a reactor body (1), a stirring device (2), a temperature control device (3), a feeding device (4), a flexible chain polymerization control device (5), and a discharge device (6). The stirring device (2) includes a motor (201), a drive shaft (202) and a stirring paddle (203). The motor (201) is installed above the vessel body (1) and is connected to the stirring paddle (203) through the drive shaft (202). The temperature control device (3) includes a heating jacket (301) disposed on the outer wall of the vessel body (1), a heating coil (302) and a temperature sensor (303) located in the inner cavity of the vessel body (1). The feeding device (4) includes a feeding pipe (401), a high-precision flow meter (402), an electric valve (403), and a feeding port (404). The flexible chain polymerization control device (5) includes a viscometer (501), an infrared spectrometer (502), a data processor (503), and a controller (504). The viscometer (501) and the infrared spectrometer (502) are disposed inside the reactor body (1). The discharge device (6) is located at the bottom of the vessel body (1). The discharge device (6) includes a sealing valve (601), a discharge pipe (602), a heat insulation layer (603), and a variable frequency delivery pump (604). The heat insulation layer (603) is provided outside the discharge pipe (602), and the variable frequency delivery pump (604) is installed on the discharge pipe (602).

2. The melamine-formaldehyde resin polycondensation reactor with flexible chain controllable polymerization according to claim 1, characterized in that: The stirring paddle (203) has a multi-layer structure, including a central stirring paddle (2031) and multiple lateral stirring paddles (2032).

3. The melamine-formaldehyde resin polycondensation reactor with flexible chain controllable polymerization according to claim 1, characterized in that: The feed pipe (401) is made of heat-insulating material.

4. The melamine-formaldehyde resin polycondensation reactor with flexible chain controllable polymerization according to claim 1, characterized in that: The viscometer (501) is a rotational viscometer, and the infrared spectrometer (502) is a near-infrared spectrometer.

5. The melamine-formaldehyde resin polycondensation reactor with flexible chain controllable polymerization according to claim 1, characterized in that: A pressure sensor (7) is installed inside the inner cavity of the vessel body (1).

6. The melamine-formaldehyde resin polycondensation reactor with flexible chain controllable polymerization according to claim 1, characterized in that: The bottom of the vessel body (1) is equipped with support legs (8).

7. The melamine-formaldehyde resin polycondensation reactor with flexible chain controllable polymerization according to claim 1, characterized in that: One end of the discharge pipe (602) is connected to a material conveying device (9).

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