Micro-suspension method PVC paste resin polymerization kettle convenient for high-pressure cleaning

Abstract

The utility model discloses a micro-suspension method PVC (polyvinyl chloride) paste resin polymerization kettle convenient for high-pressure cleaning, which comprises a kettle body, jackets arranged on the side wall and the bottom side wall of the kettle body, a stirring shaft arranged at the center of the top of the kettle body, a speed reducer connected with the stirring shaft through the kettle body, a motor connected with the speed reducer, a plurality of stirring rods arranged on the stirring shaft, and a water pump arranged on the stirring rod. The two ends of the stirring rod are fixedly connected with the upper portion and the lower portion of the stirring shaft through arc sections respectively, a manhole and a feeding pipeline are further arranged on the arc-shaped top of the kettle body, and a discharging pipeline is arranged at the arc-shaped bottom of the kettle body. Cooling water is introduced into the stirring shaft and the stirring rod, so that heat released by polymerization reaction can be taken away, and heat accumulation in the kettle is effectively avoided; during cleaning, a high-pressure cleaning pipeline with a three-dimensional nozzle penetrates into the polymerization kettle through a manhole, so that dead-corner-free cleaning of the interior of the polymerization kettle is realized; the reducing part of the lower part of the stirring shaft is transited through a conical surface, so that the adhesion and accumulation of materials in the reaction process can be effectively reduced, and the cleaning effect is improved.

Description

Technical fields:

[0001] This utility model relates to the field of polyvinyl chloride production technology, and in particular to a micro-suspension PVC paste resin polymerization reactor that is easy to clean under high pressure. Background technology:

[0002] Polyvinyl chloride (PVC) paste resin is a white powder material in its unprocessed state. It is mixed with plasticizers and other additives to form a liquid plasticized paste, which is mainly used in medical gloves, artificial leather, floor coverings, conveyor belts, dipped gloves, paddy field boots, tool handles, wallpaper, floor rolls, battery separators, toys, metal coatings, hoses, automotive interior materials, and many other fields. The polymerization methods for producing PVC paste resin mainly include micro-suspension polymerization, seed emulsion polymerization, and mixing methods.

[0003] The micro-suspension process for producing PVC paste resin offers advantages such as easy diffusion of polymerization heat, easy control of polymerization temperature, and narrow molecular weight distribution of the polymer products. Micro-suspension PVC paste resin can be molded into special shapes, is easy to foam, requires fewer heating cycles, and can be produced in small quantities with a wide variety of products. These characteristics make PVC paste resin widely used in the field of soft products, such as artificial leather, floor coverings, toys, wallpaper, and automotive interior materials, and it has broad market prospects.

[0004] The micro-suspension method for PVC paste resin first involves mechanically homogenizing a portion of vinyl chloride monomer (VCM) to form a stable emulsion, which is then subjected to polymerization in a polymerization reactor.

[0005] Since the polymerization product is a latex particle, it easily adheres to the contact surfaces of the equipment. During the cleaning process of the polymerization reactor, the internal structure of the reactor creates cleaning dead zones, especially the lower part of the stirring shaft where the diameter is smaller, making it difficult to clean thoroughly and causing the accumulation of impurities. This requires manual cleaning periodically through the manhole at the top of the reactor, which poses a safety hazard and affects production efficiency and product quality. Utility model content:

[0006] To solve the above-mentioned technical problems, the purpose of this utility model is to provide a micro-suspension PVC paste resin polymerization reactor that effectively avoids the adhesion and accumulation of impurities and is easy to clean.

[0007] The technical solution adopted by this utility model to solve its technical problem is a micro-suspension PVC paste resin polymerization reactor that is easy to clean under high pressure. The reactor includes a reactor body, with jackets on the side walls and bottom side walls. A stirring shaft is provided at the center of the top of the reactor body. The top end of the stirring shaft passes through the reactor body and is drivenly connected to the output end of a reducer. The input end of the reducer is drivenly connected to the output end of a motor. The bottom of the stirring shaft is rotatably connected to the center of the bottom of the reactor body. Multiple stirring rods are connected circumferentially on the stirring shaft. The two ends of each stirring rod are connected to the upper and lower parts of the stirring shaft respectively through arc segments. A manhole and a feed pipe are also provided on the arc-shaped top of the reactor body, and a discharge pipe is provided on the arc-shaped bottom of the reactor body.

[0008] Furthermore, a high-pressure cleaning pipe is provided at the manhole, and the lower part of the high-pressure cleaning pipe is connected to a three-dimensional nozzle that is movably placed inside the vessel.

[0009] Furthermore, there are three stirring rods, and the stirring shaft and the stirring rods are hollowly connected.

[0010] Furthermore, the lower part of the connection between the stirring shaft and the bottom end of the stirring rod is a variable diameter section, which is a solid shaft with a smaller diameter, and the variable diameter section has a conical or arc-shaped structure.

[0011] The beneficial effects of this invention are: introducing cooling water into the stirring shaft and stirring rod can remove the exothermic reaction of polymerization and effectively prevent heat accumulation in the reactor; during cleaning, the high-pressure cleaning pipeline with three-dimensional nozzles is inserted into the polymerization reactor through the manhole to achieve thorough cleaning of the reactor interior; the transition at the lower diameter of the stirring shaft using a conical or arc-shaped surface can effectively eliminate cleaning dead angles, effectively reduce material accumulation during the reaction process, and improve the cleaning effect. Attached image description:

[0012] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0013] Figure 1 This is a schematic diagram of the structure of this utility model.

[0014] Figure 2 for Figure 1 A magnified view of part A in the image.

[0015] Figure 3 for Figure 1 A magnified view of part B in the image.

[0016] Figure 4 This is a schematic diagram of the internal structure of the stirring shaft and stirring rod described in this utility model.

[0017] In the diagram: 1. Vessel body; 2. Jacket; 3. Stirring shaft; 3.1. Variable diameter section; 4. Reducer; 5. Motor; 6. Stirring rod; 7. Manhole; 8. Feed pipe; 9. Discharge pipe; 10. High-pressure cleaning pipe; 11. Three-dimensional nozzle; 12. Water inlet pipe. Detailed implementation method:

[0018] 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.

[0019] Combination Figures 1-3 As shown, this utility model is a micro-suspension PVC paste resin polymerization reactor that is easy to clean under high pressure. It includes a vertically arranged reactor body 1 with an arc-shaped top and bottom. Jackets 2 are provided on the side walls and outer sides of the bottom of the reactor body 1. A stirring shaft 3 is located at the center of the top of the reactor body 1. The top of the stirring shaft 3 extends upward through the reactor body 1 and is connected to the output end of a reducer 4. Specifically, the transmission gear inside the reducer 4 can be sleeved and fixed on the stirring shaft 3 to achieve power transmission (this structure is prior art and is not shown in the attached drawings). The input end of the reducer 4 is connected to the output end of a motor 5. The bottom of the stirring shaft 3 is rotatably connected to the center of the bottom of the reactor body 1. Three stirring rods 6 are evenly distributed around the stirring shaft 3. Each stirring rod 6 is connected to the upper and lower parts of the stirring shaft 3 through arc-shaped segments at both ends. Both the stirring shaft 3 and the stirring rods 6 are hollow inside, and the stirring rods 6 communicate with the hollow stirring shaft 3 through the hollow arc-shaped segments. Specifically, as shown... Figure 4 As shown, a water inlet pipe 12 is inserted into the stirring shaft 3. The bottom end of the water inlet pipe 12 extends to the connection between the bottom end of the stirring shaft 3 and the bottom end of the stirring rod 6, and the outer edge of the bottom end of the water inlet pipe 12 is sealed to the inner wall of the stirring shaft 3. The bottom end of the water inlet pipe 12 is connected to the interior of each stirring rod 6. The cooling water introduced by the water inlet pipe 12 flows downward into each stirring rod 6. Then, under the action of water pressure, the cooling water flows upward along the stirring rod 6 back to the space between the inner wall of the stirring shaft 3 and the water inlet pipe 12, until it flows upward. In this way, the cooling water is introduced to carry away the exothermic reaction of polymerization and effectively avoid the accumulation of heat in the reactor.

[0020] The top of the inlet pipe 12 is connected to the water supply pipe through an existing rotary joint, and the top of the stirring shaft 3 is also connected to the drain pipe through an existing rotary joint (the rotary joint connection structure is existing technology and is not shown in the attached figure). The lower part of the connection between the stirring shaft 3 and the bottom of the stirring rod 6 is a variable diameter section 3.1. The variable diameter section 3.1 is a solid shaft with a smaller diameter. The variable diameter section 3.1 can eliminate the cleaning dead corners on the stirring shaft 3 through the transition of the conical surface or the arc surface, reduce the adhesion and accumulation of reactants, and improve the cleaning effect. A manhole 7 and a feed pipe 8 are also provided on the arc-shaped top of the reactor body 1. A high-pressure cleaning pipe 10 is also provided at the manhole 7. The lower part of the high-pressure cleaning pipe 10 is connected to a three-dimensional nozzle 11 to achieve cleaning of the inside of the polymerization reactor without dead corners. A discharge pipe 9 is provided on the arc-shaped bottom of the reactor body 1 near the stirring shaft 3.

[0021] Working principle:

[0022] During operation, close the manhole cover and add the materials required for the polymerization reaction into the polymerization reactor through the feed pipe 8. Start the agitator and circulate hot water through the jacket 2 to heat the materials inside the reactor. After heating to a certain temperature, the polymerization reaction begins. The polymerization process generates heat of reaction. At this time, cold water is circulated through the jacket 2 and the water inlet pipe 12 to remove the heat generated by the polymerization reaction and ensure that the polymerization reaction is carried out at the temperature required for the reaction. After the polymerization reaction is completed, the reaction products are discharged through the bottom discharge pipe 9. After the materials are completely discharged, open the manhole cover and insert the high-pressure cleaning pipe 10 with the three-dimensional nozzle 11 into the polymerization reactor through the manhole 7. High-pressure cleaning water-high-pressure cleaning liquid-high-pressure cleaning water are circulated in sequence to clean the polymerization reactor. During the cleaning process, the high-pressure cleaning pipe 10 is moved to achieve complete cleaning inside the reactor.

[0023] The above description is only a preferred embodiment of the present utility model and is used only to facilitate the explanation of the present utility model. It is not intended to limit the present utility model in any way. Any person skilled in the art who makes partial modifications or alterations to the technical content disclosed in the present utility model without departing from the scope of the technical features of the present utility model shall still fall within the scope of the technical features of the present utility model.

Claims

1. A micro-suspension PVC paste resin polymerization reactor that facilitates high-pressure cleaning, characterized in that, The device includes a vessel body with jackets on its side and bottom side walls. A stirring shaft is located at the center of the top of the vessel body. The top end of the stirring shaft passes through the vessel body and is connected to the output end of a reducer. The input end of the reducer is connected to the output end of a motor. The bottom of the stirring shaft is rotatably connected to the center of the bottom of the vessel body. Multiple stirring rods are circumferentially connected to the stirring shaft. Each stirring rod is connected to the upper and lower parts of the stirring shaft at both ends via arc segments. A manhole and a feed pipe are also provided on the arc-shaped top of the vessel body, and a discharge pipe is provided on the arc-shaped bottom of the vessel body.

2. The micro-suspension PVC paste resin polymerization reactor according to claim 1, characterized in that, A high-pressure cleaning pipe is also provided at the manhole, and the lower part of the high-pressure cleaning pipe is connected to a three-dimensional nozzle that is movable inside the vessel.

3. The micro-suspension PVC paste resin polymerization reactor according to claim 1, characterized in that, There are three stirring rods, and the stirring shaft and the stirring rods are hollow and connected internally.

4. A micro-suspension PVC paste resin polymerization reactor that is easy to clean under high pressure, as described in any one of claims 1 to 3, characterized in that, The lower part of the connection between the stirring shaft and the bottom end of the stirring rod is a variable diameter section, which is a solid shaft with a smaller diameter, and the variable diameter section has a conical or arc-shaped structure.

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