High impact polystyrene preparation system

Abstract

The utility model discloses a high impact polystyrene preparation system, including blender, primary prepolymerization kettle, secondary prepolymerization kettle, reactor and devolatilization ware, primary prepolymerization kettle is connected with blender through first pipeline, secondary prepolymerization kettle is connected with primary prepolymerization kettle through second pipeline, reactor is connected with secondary prepolymerization kettle through third pipeline, and devolatilization ware is connected with secondary prepolymerization kettle through third pipeline. And the devolatilization device is connected with the reactor through a fourth pipeline. According to the high impact polystyrene preparation system disclosed by the utility model, 30% of polymerization reaction conversion is completed through the matching of the first-stage prepolymerization kettle and the second-stage prepolymerization kettle, so that materials can be sheared to be uniform, fine and better subjected to polymerization reaction, the molecular mass distribution of an HIPS (High Impact Polystyrene) polymer is improved, the grafting strength is increased, and the quality of an HIPS product is further improved; due to the cooperation of the first-stage prepolymerization kettle and the second-stage prepolymerization kettle, the temperature during the primary polymerization reaction can be reduced, the reaction rate can be slowed down, and further the generation of reaction heat is reduced, so that the overtemperature and overpressure risk is avoided, and the safety production is ensured.

Description

Technical Field

[0001] This utility model relates to the field of HIPS production equipment technology, and in particular to a high-impact polystyrene preparation system. Background Technology

[0002] High-impact polystyrene, also known as HIPS, is a thermoplastic material made from elastomer-modified polystyrene. It is a two-phase system consisting of a rubber phase and a continuous polystyrene phase. It has developed into an important polymer commodity in the world. This general-purpose product has a wide range of impact and processing properties, making it widely used in the automotive, machinery, electrical products, furniture, household appliances, telecommunications, electronics, computers, disposable products, pharmaceuticals, packaging and entertainment markets.

[0003] Currently, in existing technologies, the production of high-impact polystyrene typically involves a single prepolymer reactor for prepolymerization, achieving a 30% polymerization conversion rate. The remaining 50% is then achieved through a multi-stage reactor. However, because a single prepolymer reactor must achieve a 30% polymerization conversion rate, the prepolymerization reaction is quite vigorous and rapid, releasing a large amount of heat and posing risks of overheating and overpressure. Furthermore, the rapid temperature rise of the material leads to a rapid increase in viscosity, resulting in poor mixing, uneven shearing, and ultimately, poor product quality. Utility Model Content

[0004] The purpose of this invention is to provide a high-impact polystyrene preparation system that improves product quality and ensures safe production.

[0005] To solve the above technical problems, the present invention can be implemented using the following technical solutions:

[0006] A high-impact polystyrene preparation system includes a mixer, a primary prepolymer reactor, a secondary prepolymer reactor, a reactor, and a devolatilizer. The primary prepolymer reactor is connected to the mixer via a first pipeline, the secondary prepolymer reactor is connected to the primary prepolymer reactor via a second pipeline, the reactor is connected to the secondary prepolymer reactor via a third pipeline, and the devolatilizer is connected to the reactor via a fourth pipeline. Delivery pumps are respectively installed on the first, second, third, and fourth pipelines.

[0007] In one embodiment, the reaction temperature of the primary prepolymer reactor is 102°C-106°C, and the polymerization conversion rate is 10%.

[0008] In one embodiment, the reaction temperature of the secondary prepolymer reactor is 125°C-128°C, and the polymerization conversion rate is 20%.

[0009] In one embodiment, the mixer has a mixing inlet at one end and a mixing outlet at the other end, and both the mixing inlet and the mixing outlet are connected to the interior of the mixer. A shaftless spiral blade is provided inside the mixer, and the shaftless spiral blade forms a spiral conveying channel inside the mixer.

[0010] In one embodiment, the mixer is provided with a heat-conducting circulation channel, and the heat-conducting circulation channel is connected to a heat-conducting circulation inlet and a heat-conducting circulation outlet.

[0011] In one embodiment, the primary prepolymer reactor and the secondary prepolymer reactor have the same structure, both including a cylindrical body and a support leg at the bottom of the cylindrical body, which allows the cylindrical body to be set vertically. The top of the cylindrical body has a feed port and an additive port, and the bottom has a discharge port and a discharge port.

[0012] In one embodiment, the cylinder is further provided with a heat transfer oil inlet and a heat transfer oil outlet, with the heat transfer oil inlet located at the lower part of the cylinder and the heat transfer oil outlet located at the upper part of the cylinder.

[0013] In one embodiment, both the primary prepolymer reactor and the secondary prepolymer reactor are equipped with stirring functions, and a motor support is provided at the upper end of the cylinder.

[0014] In one embodiment, the reactor includes a primary reactor, a secondary reactor, a tertiary reactor, and a quaternary reactor connected in sequence, wherein the primary reactor is connected to the secondary prepolymer reactor via a third pipeline, and the quaternary reactor is connected to the devolatilizer via a fourth pipeline.

[0015] In one embodiment, the reaction temperature of the primary reactor is 130℃-135℃, the reaction temperature of the secondary reactor is 140℃-145℃, the reaction temperature of the tertiary reactor is 150℃-165℃, and the reaction temperature of the quaternary reactor is 170℃-180℃. Beneficial effects

[0016] This utility model relates to a high-impact polystyrene (HIPS) preparation system. A mixer transports materials to a primary prepolymer reactor via a first pipeline, where 10% of the polymerization reaction is completed. Then, a second pipeline transports the materials from the primary prepolymer reactor to a secondary prepolymer reactor, where 20% of the polymerization reaction is completed. The combined operation of the primary and secondary prepolymer reactors achieves the remaining 30% of the polymerization reaction. This increases the residence time of the materials during the reaction process, enhancing the stirring effect under the same production load, resulting in more uniform material mixing without increasing the reaction time. Simultaneously, it also shears the materials into uniform and fine particles, facilitating the polymerization reaction and improving the molecular weight distribution of HIPS polymers, increasing grafting strength, and thus enhancing the quality of HIPS products. Furthermore, the combined operation of the primary and secondary prepolymer reactors lowers the reaction temperature and slows the reaction rate, thereby reducing the generation of reaction heat and avoiding the risks of overheating and overpressure, ensuring safe production. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the high-impact polystyrene preparation system of this utility model;

[0018] Figure 2 This is a schematic diagram of the primary prepolymer reactor of the high-impact polystyrene preparation system of this utility model;

[0019] Figure 3 This is a schematic diagram of the mixer in the high-impact polystyrene preparation system of this utility model.

[0020] As shown in the attached diagram:

[0021] 100. Mixer; 110. Mixing inlet; 120. Mixing outlet; 130. Shaftless spiral blade; 140. Spiral conveying channel; 150. Heat-conducting circulation channel; 160. Heat-conducting circulation inlet; 170. Heat-conducting circulation outlet; 200. Primary prepolymerization reactor; 210. Cylinder; 220. Support leg; 230. Feed inlet; 240. Additive inlet; 250. Discharge outlet; 260. Discharge port; 270. Heat-conducting oil inlet; 280. Heat-conducting oil outlet; 290. Motor support; 300. Secondary prepolymerization reactor; 400. Reactor; 500. Deviation device; 600. First pipeline; 700. Second pipeline; 800. Third pipeline; 900. Fourth pipeline; 1000. Conveying pump. Detailed Implementation

[0022] To make the above-mentioned objects, features, and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a full understanding of this utility model. However, this utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed below.

[0023] It should be noted that when an element is said to be "fixed to" another element, it can be directly on the other element or there may be an intervening element. When an element is said to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. Conversely, when an element is said to be "directly on" another element, there is no intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0024] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0025] Please see Figure 1 A high-impact polystyrene preparation system includes a mixer 100, a primary prepolymer reactor 200, a secondary prepolymer reactor 300, a reactor 400, and a devolatilizer 500. The primary prepolymer reactor 200 is connected to the mixer 100 via a first pipeline 600, the secondary prepolymer reactor 300 is connected to the primary prepolymer reactor 200 via a second pipeline 700, the reactor 400 is connected to the secondary prepolymer reactor 300 via a third pipeline 800, and the devolatilizer 500 is connected to the reactor 400 via a fourth pipeline 900. A delivery pump 1000 is installed on the first pipeline 600, the second pipeline 700, the third pipeline 800, and the fourth pipeline 900, respectively.

[0026] Specifically, in this embodiment, the mixer 100 performs preliminary mixing of the materials. The preliminarily mixed materials are then transported to the primary prepolymer reactor 200 via the conveying pump 1000 and the first pipeline 600. The primary prepolymer reactor 200 carries out the first polymerization reaction. The reaction temperature of the primary prepolymer reactor 200 is 102℃-106℃, and its polymerization conversion rate is 10%. After the first polymerization reaction, the materials are transported to the secondary prepolymer reactor 300 via the conveying pump 1000 and the second pipeline 700. The prepolymer reactor 300 undergoes a second polymerization reaction. The reaction temperature of the prepolymer reactor 300 is 125℃-128℃, and its polymerization conversion rate is 20%. After the polymerization reaction, the material is transported to the reactor 400 through the transfer pump 1000 and the third pipeline 800. The reactor 400 completes the subsequent 50% polymerization conversion. Finally, the material is transported to the devolatilizer 500 through the transfer pump 1000 and the fourth pipeline 900 for devolatilization treatment. After extrusion, cooling, cutting into strips and granulation, high-impact polystyrene can be obtained.

[0027] By combining the primary prepolymer reactor 200 and the secondary prepolymer reactor 300, 30% of the material can undergo polymerization reaction conversion. This increases the residence time of the material during the polymerization process, enhancing the stirring effect under the same production load, ensuring uniform mixing of the material without increasing the reaction time. Simultaneously, it also allows for uniform and fine shearing of the material, facilitating better polymerization and improving the molecular weight distribution of HIPS polymers, increasing grafting strength, and ultimately enhancing the quality of HIPS products. Furthermore, the combination of the primary and secondary prepolymer reactors lowers the temperature during the first polymerization reaction, slowing down the reaction rate and reducing heat generation, thus avoiding the risks of overheating and overpressure and ensuring safe production.

[0028] Please see Figure 1 and Figure 3 To improve product quality, the mixer 100 in this embodiment has a mixing inlet 110 at one end and a mixing outlet 120 at the other end. Both the mixing inlet 110 and the mixing outlet 120 are connected to the interior of the mixer 100. A shaftless spiral blade 130 is provided inside the mixer 100. The shaftless spiral blade 130 forms a spiral conveying channel 140 inside the mixer 100. At the same time, the mixer 100 is provided with a heat conduction circulation channel 150, and the heat conduction circulation channel 150 is connected to a heat conduction circulation inlet 160 and a heat conduction circulation outlet 170.

[0029] Materials are conveyed into the mixer 100 through the mixing inlet 110. Since the mixer 100 is equipped with a shaftless spiral blade 130, the shaftless spiral blade 130 can form a spiral conveying channel 140 inside the mixer 100. Therefore, when the materials are conveyed into the mixer 100 through the mixing inlet 110, they will be conveyed in a spiral manner. Through the spiral conveying, the materials can be mixed more thoroughly in the spiral conveying channel 140 to improve the mixing effect between materials. At the same time, heat-conducting liquid is circulated into the heat-conducting circulation channel 150 through the heat-conducting circulation inlet 160 and the heat-conducting circulation outlet 170 to heat the materials to meet the mixing requirements of the materials, thereby ensuring more thorough mixing of materials and improving the production quality of subsequent products.

[0030] Please see Figure 1 and Figure 2 In order to achieve the prepolymerization reaction of the materials, the primary prepolymer reactor 200 and the secondary prepolymer reactor 300 in this embodiment have the same structure, both including a cylinder 210, and a support leg 220 is provided at the lower part of the cylinder 210. The support leg 220 allows the cylinder 210 to be set vertically. The top of the cylinder 210 is provided with a feed port 230 and an additive port 240, and the bottom is provided with a discharge port 250 and a discharge port 260. At the same time, the cylinder 210 is also provided with a heat transfer oil inlet 270 and a heat transfer oil outlet 280. The heat transfer oil inlet 270 is located at the lower part of the cylinder 210, and the heat transfer oil outlet 280 is located at the upper part of the cylinder 210. Both the primary prepolymer reactor 200 and the secondary prepolymer reactor 300 have a stirring function, and a motor support 290 is provided at the upper end of the cylinder 210. The motor support 290 is used to install and fix the drive motor for stirring.

[0031] Finally, please see Figure 1 To achieve a subsequent 50% polymerization conversion, reactor 400 includes a primary reactor 410, a secondary reactor 420, a tertiary reactor 430, and a quaternary reactor 440 connected sequentially. The primary reactor 410 is connected to the secondary prepolymer reactor 300 via a third pipeline 800, and the quaternary reactor 440 is connected to the devolatilizer 500 via a fourth pipeline 900. The reaction temperature of the primary reactor 410 is 130℃-135℃, the secondary reactor 420 is 140℃-145℃, the tertiary reactor 430 is 150℃-165℃, and the quaternary reactor 440 is 170℃-180℃. The reaction temperatures of the primary reactor 410, secondary reactor 420, tertiary reactor 430, and quaternary reactor 440 achieve a 50% polymerization conversion of the material, thus ensuring a gradual and gentle polymerization reaction, reducing heat release, avoiding the risks of overheating and overpressure, and ensuring safe production.

[0032] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art can readily implement this utility model based on the accompanying drawings and the above description; however, any modifications, alterations, or variations made by those skilled in the art without departing from the scope of the utility model's technical solution, utilizing the disclosed technical content, are equivalent embodiments of this utility model; furthermore, any equivalent changes, alterations, or variations made to the above embodiments based on the essential technology of this utility model are still within the protection scope of this utility model's technical solution.

Claims

1. A high-impact polystyrene preparation system, characterized in that: It includes a mixer, a primary prepolymer reactor, a secondary prepolymer reactor, a reactor, and a devolatilizer. The primary prepolymer reactor is connected to the mixer via a first pipeline, the secondary prepolymer reactor is connected to the primary prepolymer reactor via a second pipeline, the reactor is connected to the secondary prepolymer reactor via a third pipeline, and the devolatilizer is connected to the reactor via a fourth pipeline. A delivery pump is installed on each of the first, second, third, and fourth pipelines.

2. The high-impact polystyrene preparation system according to claim 1, characterized in that: The reaction temperature of the primary prepolymer reactor is 102℃-106℃, and the polymerization conversion rate is 10%.

3. The high-impact polystyrene preparation system according to claim 2, characterized in that: The reaction temperature of the secondary prepolymer reactor is 125℃-128℃, and the polymerization conversion rate is 20%.

4. The high-impact polystyrene preparation system according to claim 1, characterized in that: The mixer has a mixing inlet at one end and a mixing outlet at the other end. Both the mixing inlet and the mixing outlet are connected to the inside of the mixer. A shaftless spiral blade is installed inside the mixer, which forms a spiral conveying channel inside the mixer.

5. The high-impact polystyrene preparation system according to claim 4, characterized in that: The mixer is equipped with a heat conduction circulation channel, which is connected to a heat conduction circulation inlet and a heat conduction circulation outlet.

6. The high-impact polystyrene preparation system according to claim 1, characterized in that: The primary prepolymer reactor and the secondary prepolymer reactor have the same structure, both including a cylindrical body and a support leg at the bottom of the cylindrical body. The support leg allows the cylindrical body to be set vertically. The top of the cylindrical body has a feed port and an additive port, and the bottom has a discharge port and a discharge port.

7. The high-impact polystyrene preparation system according to claim 6, characterized in that: The cylinder is also provided with a heat transfer oil inlet and a heat transfer oil outlet. The heat transfer oil inlet is located at the lower part of the cylinder, and the heat transfer oil outlet is located at the upper part of the cylinder.

8. The high-impact polystyrene preparation system according to claim 6, characterized in that: Both the primary and secondary prepolymerization reactors are equipped with stirring functions, and a motor support is provided at the upper end of the cylinder.

9. The high-impact polystyrene preparation system according to claim 1, characterized in that: The reactor comprises a primary reactor, a secondary reactor, a tertiary reactor, and a quaternary reactor connected in sequence. The primary reactor is connected to the secondary prepolymer reactor via a third pipeline, and the quaternary reactor is connected to the devolatilizer via a fourth pipeline.

10. The high-impact polystyrene preparation system according to claim 9, characterized in that: The reaction temperature of the first-stage reactor is 130℃-135℃, the reaction temperature of the second-stage reactor is 140℃-145℃, the reaction temperature of the third-stage reactor is 150℃-165℃, and the reaction temperature of the fourth-stage reactor is 170℃-180℃.

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