Double shaft devolatilization reaction device

Abstract

The utility model relates to double shaft type devolatilization reaction device belongs to chemical reaction and separation equipment technical field. This double shaft type devolatilization reaction device, base, one side fixed mounting of base has the support board, one side fixed mounting of support board has the barrel, the barrel sets up as the conical cylinder shape, the top fixed mounting of barrel has the inlet; devolatilization mechanism is arranged in one side of the barrel for efficient continuous reaction devolatilization, wherein, the devolatilization mechanism includes two double screw rods arranged in the barrel; when using, the double screw rod in the barrel runs in the differential speed same direction rotation mode, and the differential speed effect enhances material layered mixing and dispersion effect, enhances the surface area, and improves devolatilization efficiency. The inlet cooperates with the double screw rod to ensure that the high viscosity material is smoothly fed. The devolatilization mechanism is connected to the vacuum system, forms low pressure, and accelerates volatilization. The heating assembly bottom temperature control forms temperature gradient, promotes gas escape, and enhances devolatilization effect.

Description

Technical Field

[0001] This utility model relates to the field of chemical reaction and separation equipment technology, and in particular to a biaxial devolatilization reaction device. Background Technology

[0002] In fields such as polymer processing, chemical reactions, and material modification, efficient devolatilization treatment is often required to remove volatile components such as low-molecular-weight substances, moisture, and residual solvents generated or mixed in during the reaction process, ensuring the purity, stability, and processing performance of the final product. Currently, common devolatilization devices mostly adopt single-screw or ordinary twin-screw extrusion structures, using exhaust ports on the screw barrel connected to a vacuum pump to extract volatiles. However, when processing large-volume solvent-based adhesives and adhesives with high base viscosity, traditional equipment generally suffers from problems such as low devolatilization efficiency, insufficient material residence time, slow temperature control response, and inadequate gas-liquid separation in the devolatilization section, making it difficult to meet the requirements of efficient continuous reaction and deep devolatilization. Utility Model Content

[0003] Therefore, it is necessary to provide a biaxial devolatilization reactor that can meet the requirements of efficient continuous reaction and deep devolatilization when processing large-volume solvent adhesives and high-viscosity base materials. This is because traditional devices generally suffer from low devolatilization efficiency, insufficient material residence time, slow temperature control response, and insufficient gas-liquid separation in the devolatilization section.

[0004] The biaxial devolatilization reactor includes: a base, a support plate fixedly installed on one side of the base, a cylinder fixedly installed on one side of the support plate, the cylinder being conical, and a feed inlet fixedly installed on the top of the cylinder; and a devolatilization mechanism, which is disposed on one side of the cylinder for efficient and continuous devolatilization; wherein the devolatilization mechanism includes two twin screws disposed inside the cylinder, a devolatilization assembly disposed on one side of the two twin screws, and a heating assembly disposed on the twin screws.

[0005] The reaction devolatilization assembly includes a limiting frame fixedly installed inside the cylinder, the limiting frame being located outside the two twin screws, the diameters of the two twin screws gradually decreasing, and a motor fixedly installed on the other side of the support plate, the motor being connected to one of the twin screws via a transmission box.

[0006] A first gear is fixedly installed on one side of each of the two twin screws, and a second gear is provided between the two first gears, and the second gear meshes with the two first gears. The second gear is rotatably installed on the other side of the support plate.

[0007] Multiple connecting pipes are fixedly installed on the top of the cylinder, and the other end of each of the multiple connecting pipes is equipped with the same vacuum pump. All of the multiple connecting pipes are connected to the limiting frame.

[0008] The other end of each of the multiple connecting pipes is fixedly installed with the same guide pipe, which is connected to the vacuum pump.

[0009] A basket filter is fixedly installed between the guide tube and the vacuum pump.

[0010] The heating assembly includes an extrusion die fixedly installed at the bottom of the cylinder, and an oil temperature controller is fixedly installed on one side of the base.

[0011] Beneficial effects The above-mentioned biaxial devolatilization reaction device.

[0012] 1. During operation, the twin screws inside the cylinder rotate in the same direction at different speeds, continuously propelling and shearing the material, improving conveying stability and mixing uniformity, increasing surface area, and enhancing devolatilization efficiency. The feed inlet, in conjunction with the twin screws, ensures smooth feeding of high-viscosity materials. The devolatilization mechanism is connected to a vacuum system, creating low pressure and accelerating volatilization. The heating element controls the temperature at the bottom, creating a temperature gradient to promote gas escape and enhance the devolatilization effect. 2. The extrusion die allows the high-viscosity melt material after devolatilization to be stably discharged along the conveying direction of the twin screw. To ensure the temperature stability at the extrusion outlet, the oil temperature controller is connected to the jacket of the extrusion die through a high-temperature heat transfer oil circulation pipeline, forming a stable and controllable constant temperature heating system. Attached Figure Description

[0013] To more clearly illustrate the technical solutions in 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 some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0014] Figure 1 This is a schematic diagram of the main structure of this utility model; Figure 2 This is a schematic diagram of the devouring mechanism of this utility model; Figure 3 This is a schematic diagram of the reaction devolatilization component of this utility model; Figure 4 This is a schematic diagram of the heating component structure of this utility model.

[0015] Figure label: 100. Base; 110. Support plate; 200. Cylinder; 210. Feed inlet; 300. Deviation mechanism; 310. Twin screw; 320. Reaction devolatilization assembly; 321. Limiting frame; 322. Motor; 323. Transmission box; 324. First gear; 325. Second gear; 326. Connecting pipe; 327. Guide pipe; 328. Basket filter; 329. Vacuum pump; 330. Heating assembly; 331. Oil temperature controller; 332. Extrusion die. Detailed Implementation

[0016] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0017] Unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as commonly understood by one of ordinary skill in the art to which this specification belongs. The terminology used in this specification 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 in this specification includes any and all combinations of one or more of the associated listed items.

[0018] The following is combined with Figures 1-4 This invention describes a biaxial devolatilization reaction apparatus.

[0019] In one embodiment, a biaxial devolatilization reactor includes: a base 100, a support plate 110 fixedly mounted on one side of the base 100, a cylinder 200 fixedly mounted on one side of the support plate 110, the cylinder 200 being conical in shape, and an inlet 210 fixedly mounted on the top of the cylinder 200; a devolatilization mechanism 300, which is configured to perform efficient and continuous devolatilization, is disposed on one side of the cylinder 200; wherein, the devolatilization mechanism 300 includes two twin screws 310 disposed inside the cylinder 200, a devolatilization assembly 320 disposed on one side of the two twin screws 310, and a heating assembly 330 disposed at the bottom of the twin screws 310.

[0020] In this embodiment, the twin screws 310 are arranged parallel to each other. During use, the two twin screws 310, located inside the cylinder 200, rotate in the same direction at a different speed under the drive of the reaction devolatilization assembly 320. The differential speed effect enhances the stratification, mixing, and dispersion of the material, allowing for continuous propulsion and strong shearing of the material entering the cylinder 200. This significantly improves the material conveying stability and mixing uniformity, increases the material devolatilization surface area, and thus enhances the devolatilization efficiency. The feed inlet 210 at the top of the cylinder 200 works in conjunction with the twin screws 310 below. The zero-structure allows for smooth feeding of high-viscosity materials. The devolatilization mechanism 300, connected to an external vacuum system, creates a low-pressure environment inside the cylinder 200, enabling the rapid vaporization and discharge of moisture, low-boiling-point components, and residual solvents in the material. This meets the process requirements for efficient and continuous reaction devolatilization. The heating component 330, located at the bottom of the twin screw 310, achieves temperature gradient control below the cylinder 200 through local temperature control, forming a thermal field distribution with different temperature steps in different areas. This promotes the escape of volatile gases to the top of the cylinder 200, further enhancing the devolatilization effect. It should be noted that the existing devolatilization reaction device includes a cylinder 200, screw assembly, feed port 210, exhaust port, heating jacket, and discharge channel. The devolatilization assembly 320 serves as the power structure for driving the twin screws 310 to rotate in the same direction at different speeds. Its connection is located on one side of the twin screws 310, so it does not interfere with the exhaust path and material channel of the cylinder 200. The heating assembly 330 is located in the lower area of ​​the cylinder 200. Its function is to heat the cylinder 200. In the overall thermal management, a gradient design with different temperature steps in different areas is formed. This structure does not contact the material channel and exhaust port, nor does it obstruct the operation of the vacuum pumping system. Its air-cooled position is far away from the vacuum interface area, so it will not cause pumping interference. It should be noted that this device is equipped with a mold temperature controller in the devolatilization section. Multiple temperature-controlled jacket structures are installed inside the cylinder 200. These jackets are distributed along the axial direction of the cylinder 200 into multiple independent heating zones. Each zone is equipped with an independent heating belt and temperature sensor for precise temperature control of different functional sections of the cylinder 200. There are no specific limitations on the number and configuration of the mold temperature controllers; they can be flexibly added or removed according to actual process requirements. It supports a single mold temperature controller driving all jackets or multiple mold temperature controllers controlling different zones. The mold temperature controller, through a closed-loop control system composed of a temperature controller, thermocouples, and a PLC, can... Temperature control accuracy is improved to within ±1℃, effectively preventing material crystallization, thermal degradation, or insufficient volatilization caused by temperature fluctuations. The temperature of the devolatilization section can be flexibly adjusted according to process requirements to achieve various working conditions such as low shear high temperature or high shear medium temperature, significantly improving devolatilization efficiency and product stability, reducing residual monomer content, and ensuring the safety and efficiency of long-cycle continuous production. Through the differential speed design of the twin-screw 310 and the cooperation of the mold temperature controller, more efficient material conveying and gas release can be achieved, significantly reducing residual volatile components. It is particularly suitable for high volatility, high sensitivity, and long-cycle continuous production processes.

[0021] like Figure 2 and Figure 3 As shown, the reaction devolatilization assembly 320 includes a limiting frame 321 fixedly installed inside the cylinder 200. The limiting frame 321 is located outside the two twin screws 310, the diameter of which gradually decreases. A motor 322 is fixedly installed on the other side of the support plate 110. The motor 322 is connected to one side of the twin screw 310 through a transmission box 323.

[0022] In this embodiment, the motor 322 is connected to the twin screws 310 on one side through the transmission box 323, and drives the two twin screws 310 to rotate in the same direction at a different speed with the cooperation of the limiting frame 321. The limiting frame 321 is set on the outside of the twin screws 310 to limit the extrusion and shearing space. It should be noted that the twin-screw 310 has a conical structure with its diameter gradually decreasing from top to bottom. It can be divided into two functional areas along its length: a feeding zone and a devolatilization zone. In the feeding zone, the twin-screw 310 has a larger thread pitch, facilitating the addition of high-viscosity raw materials. Simultaneously, the deeper screw grooves in this section promote smooth material entry into the barrel 200, reducing the risk of blockage and improving feeding efficiency. In the devolatilization zone, the twin-screw 310's thread pitch gradually decreases, and the screw groove depth becomes shallower. Furthermore, the screw surface is equipped with a reverse screw ridge structure and liquid film disturbance grooves. This structure, on the one hand, creates material shear compression, increasing its unit time heating and specific surface area; on the other hand, the reverse screw ridges break up the liquid film or foam layer formed during the volatilization process, effectively releasing entrained gas and enhancing devolatilization efficiency.

[0023] A first gear 324 is fixedly installed on one side of each of the two twin screws 310. A second gear 325 is provided between the two first gears 324 and the second gear 325 is meshed with the two first gears 324. The second gear 325 is rotatably installed on the other side of the support plate 110.

[0024] In this embodiment, when the motor 322 drives the first gear 324 on one side to rotate through the transmission box 323, the second gear 325, as an intermediate transmission element, can synchronously drive the first gear 324 on the other side to rotate, thereby realizing the differential rotation of the two twin screws 310 in the same direction. It should be noted that the first gears 324 connected to the two twin screws 310 have different diameters. The screw speed corresponding to the larger gear is relatively low, while the screw speed corresponding to the smaller gear is relatively high, forming a small speed difference of 3% to 10%, which in turn constitutes an asymmetric shear zone. This differential speed design enhances the asymmetric stretching and disturbance of the material in the meshing zone, significantly improves the efficiency of bubble bursting and gas release, and at the same time accelerates the material tumbling frequency, shortens the migration path of volatile gases, and comprehensively improves the devolatilization effect.

[0025] Multiple connecting pipes 326 are fixedly installed on the top of the cylinder 200. The other end of each connecting pipe 326 is equipped with the same vacuum pump 329. All connecting pipes 326 are connected to the limiting frame 321.

[0026] In this embodiment, by fixing multiple connecting pipes 326 on the top of the cylinder 200 and connecting the other end of each connecting pipe 326 to the same vacuum pump 329, volatile gases can be uniformly extracted from multiple locations inside the cylinder 200, significantly improving the devolatification efficiency and system stability.

[0027] The other end of multiple connecting pipes 326 is fixedly installed with the same guide pipe 327, which is connected to the vacuum pump 329.

[0028] In this embodiment, by uniformly fixing the same guide pipe 327 at the other end of multiple connecting pipes 326 and connecting the guide pipe 327 to the vacuum pump 329, a devolatile gas delivery system with decentralized pumping, centralized flow guidance, and unified exhaust is constructed. Multiple connecting pipes 326 are respectively connected to different positions on the top of the cylinder 200 and communicate with the limiting frame 321, which can quickly guide the volatile gases generated in different areas inside the cylinder 200 into the guide pipe 327, and then guide the gas to the vacuum pump 329 for unified exhaust.

[0029] A basket filter 328 is fixedly installed between the guide tube 327 and the vacuum pump 329.

[0030] In this embodiment, a basket filter 328 is provided between the guide tube 327 and the vacuum pump 329. This basket filter can perform primary filtration of fine particles, condensate droplets, or material impurities carried in the guide tube 327, preventing impurities from entering the vacuum pump 329 with the airflow and causing equipment blockage, wear, or a decrease in vacuum efficiency. The basket filter 328 adopts a high-flow-rate, high-capacity metal filter mesh structure, which is suitable for non-condensable components or colloidal residues that may be carried during continuous devolatilization. It can effectively intercept material powder or residues while ensuring smooth airflow.

[0031] like Figure 2 and Figure 4 As shown, the heating assembly 330 includes an extrusion die 332 fixedly installed at the bottom of the cylinder 200, and an oil temperature controller 331 fixedly installed on one side of the base 100.

[0032] In this embodiment, the extrusion die 332 allows the high-viscosity melt material after devolatilization to be stably discharged along the conveying direction of the twin screw 310. To ensure the temperature stability at the extrusion outlet, the oil temperature controller 331 is connected to the jacket of the extrusion die 332 through a high-temperature heat transfer oil circulation pipeline to form a stable and controllable constant temperature heating system. It should be noted that the extrusion die 332 at the bottom of the twin-screw extruder 310 serves as the material outlet and is directly fixed to the bottom of the barrel 200. The oil temperature controller 331 heats the extrusion die 332 through a heat transfer oil circulation system, achieving precise control of the outlet material temperature and effectively preventing blockage caused by melt cooling at the outlet. The oil temperature controller 331 has no mechanical connection to the twin-screw extruder 310 body; temperature control is mainly achieved through the heat transfer oil circulation system.

[0033] Working Principle: The twin-screw structure 310, located inside the cylinder 200, enables continuous conveying, shearing, and devolatilization of high-viscosity materials. During operation, the material enters through the inlet 210 at the top of the cylinder 200. Driven by the reactive devolatilization assembly 320, the twin screws 310 rotate differentially in the same direction, propelling the material axially. The twin-screw structure 310 is divided into a feeding zone and a devolatilization zone. The large pitch at the front facilitates rapid feeding, while the reduced pitch at the rear, combined with anti-reverse screw ridges and a disturbance structure, compresses and shears the material, increasing its specific surface area and enhancing devolatilization efficiency. During material transport, multiple connecting pipes 326 at the top of the cylinder 200 connect to the limiting frame 321. These connecting pipes 326 converge into the guide pipe 327, which then... A vacuum pump 329 is connected to form a multi-point pumping system, which achieves uniform decompression in the reaction space and promotes the rapid volatilization of low-boiling-point components. The heating component 330 provides constant-temperature heating to the extrusion die 332 at the bottom of the twin-screw 310, keeping the outlet material temperature stable and preventing high-viscosity melt from cooling and clogging, ensuring continuous and stable material discharge. To prevent crystallization or clogging caused by temperature fluctuations in the die area, an oil temperature controller 331 is installed on one side of the base 100, which uses heat transfer oil to provide constant-temperature heating to the extrusion die 332, ensuring stable material discharge. A basket filter 328 is installed between the guide tube 327 and the vacuum pump 329 to filter powder or particles entrained in the airflow, preventing impurities from entering the vacuum pump 329 and ensuring the safe operation of the pumping system.

[0034] It should be noted that the motors, vacuum pumps, and oil temperature controllers mentioned above are all devices with relatively mature existing technologies. Specific models can be selected according to actual needs. At the same time, the motors, vacuum pumps, and oil temperature controllers can be powered by built-in power supplies or by mains power. The specific power supply method should be selected according to the situation, and will not be elaborated here.

[0035] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0036] The above-described embodiments are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of this utility model. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the appended claims.

Claims

1. A biaxial devolatilization reaction apparatus, characterized in that, include: A base (100) is provided with a support plate (110) fixedly installed on one side of the base (100), and a cylinder (200) is fixedly installed on one side of the support plate (110). The cylinder (200) is set in the shape of a cone, and a feed inlet (210) is fixedly installed on the top of the cylinder (200). A devolatilization mechanism (300) for efficient and continuous reactive devolatilization is disposed on one side of a cylinder (200); wherein the devolatilization mechanism (300) includes two twin screws (310) disposed inside the cylinder (200), a reactive devolatilization assembly (320) is disposed on one side of the two twin screws (310), and a heating assembly (330) is disposed at the bottom of the twin screws (310).

2. The biaxial devolatilization reactor according to claim 1, characterized in that, The reaction devolatilization assembly (320) includes a limiting frame (321) fixedly installed inside the cylinder (200). The limiting frame (321) is located outside the two twin screws (310), the diameter of which gradually decreases. A motor (322) is fixedly installed on the other side of the support plate (110). The motor (322) is connected to one side of the twin screw (310) via a transmission box (323).

3. The biaxial devolatilization reactor according to claim 1, characterized in that, A first gear (324) is fixedly installed on one side of each of the two twin screws (310), and a second gear (325) is provided between the two first gears (324), and the second gear (325) is meshed with the two first gears (324). The second gear (325) is rotatably installed on the other side of the support plate (110).

4. The biaxial devolatilization reactor according to claim 1, characterized in that, Multiple connecting pipes (326) are fixedly installed on the top of the cylinder (200), and the other end of each of the multiple connecting pipes (326) is provided with the same vacuum pump (329). The multiple connecting pipes (326) are all connected to the limiting frame (321).

5. The biaxial devolatilization reactor according to claim 4, characterized in that, The other end of each of the multiple connecting pipes (326) is fixedly installed with the same guide pipe (327), which is connected to the vacuum pump (329).

6. The biaxial devolatilization reactor according to claim 5, characterized in that, A basket filter (328) is fixedly installed between the guide tube (327) and the vacuum pump (329).

7. The biaxial devolatilization reactor according to claim 1, characterized in that, The heating assembly (330) includes an extrusion die (332) fixedly installed at the bottom of the cylinder (200), and an oil temperature controller (331) fixedly installed on one side of the base (100).

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