Prepolymer vacuum reaction kettle
The multi-layered stirring structure solves the problem of bubble formation in the prepolymer vacuum reactor, achieving uniform mixing and improved stability of the prepolymer, thus ensuring product performance stability and reaction efficiency.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-05-06
- Publication Date
- 2026-04-07
AI Technical Summary
In traditional prepolymer vacuum reactors, under vacuum stirring and heating conditions, volatile substances form bubbles that occupy the reactor space, reduce the contact area of reactants, decrease reaction efficiency, and may alter the internal structure of the prepolymer, affecting product performance.
The multi-layered stirring structure includes a stirring rod, first and second stirring paddles, a spiral plate, and a scraper. Through axial circulation, turbulence, and cutting action, it breaks up bubble aggregation, promotes bubble discharge, and ensures uniform mixing of reactants.
It effectively reduces bubble content, improves the density and stability of prepolymer, avoids performance degradation, ensures uniform and consistent reaction, prevents material from sticking to the wall and scaling, and improves heat transfer efficiency.
Smart Images
Figure CN224086747U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to the technical field of reaction kettle, especially relates to a prepolymer vacuum reaction kettle. BACKGROUND
[0002] The prepolymer vacuum reaction kettle is a professional equipment for synthesizing prepolymer materials, which combines the functions of vacuum technology and reaction kettle, and is widely used in the fields of chemical industry, material science and polymer synthesis. Its core function is to perform the synthesis reaction of prepolymer in a vacuum environment, and to realize efficient and accurate chemical reaction by controlling parameters such as temperature, pressure and reaction time.
[0003] However, in the traditional vacuum stirring reaction process of the prepolymer vacuum reaction kettle, some raw materials contain volatile substances. Under the conditions of vacuum stirring and heating, these substances volatilize to form bubbles, which will occupy the space inside the reaction kettle, reduce the actual contact area of the reaction materials, and reduce the reaction efficiency. It may also change the internal structure of the prepolymer, thereby reducing the physical and chemical properties of the product.
[0004] For example, in some products with high appearance requirements, such as automotive interior parts and furniture surface coatings, the existence of bubbles will seriously affect the market competitiveness of the product. Bubbles will reduce the strength, toughness and durability of the material, affecting its service life. INVENTION CONTENTS
[0005] The utility model discloses a prepolymer vacuum reaction kettle, which aims to solve the technical problem that in the traditional vacuum stirring reaction process of the prepolymer vacuum reaction kettle, some raw materials contain volatile substances, which volatilize to form bubbles under the conditions of vacuum stirring and heating. The bubbles will occupy the space inside the reaction kettle, reduce the actual contact area of the reaction materials, and reduce the reaction efficiency. It may also change the internal structure of the prepolymer, thereby reducing the physical and chemical properties of the product.
[0006] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme:
[0007] A prepolymer vacuum reaction kettle, comprising a kettle body, a feed pipe, a rack and an exhaust pipe are provided on the top outer wall of the kettle body, one end of the exhaust pipe is fixedly connected with a vacuum pump, further comprising: a motor is provided on the top outer wall of the rack, the output shaft of the motor is fixedly connected with a stirring rod, one end of the stirring rod extends into the interior of the kettle body, a first baffle and three equally spaced first stirring paddles are provided on the circumferential outer wall of the stirring rod, the first baffle is located above the first stirring paddles, two connecting frames are provided on the bottom outer wall of the first baffle, three equally spaced second stirring paddles are provided on one side outer wall of the connecting frame.
[0008] The technical scheme can effectively reduce the bubble content in the prepolymer, improve the compactness and stability of the prepolymer, and avoid the performance decline of the prepolymer caused by the bubbles. Specifically, the kettle body is stably installed at a suitable position, the exhaust pipe is reliably connected with the vacuum pump, the connection is well sealed to prevent air leakage, the raw materials required for the prepolymer reaction are slowly added into the kettle body through the feeding pipe according to the specified proportion and sequence, then the vacuum pump is started to perform the vacuumizing operation on the kettle body, the reading of the vacuum gauge is closely observed during the vacuumizing process, the vacuum degree in the kettle body is adjusted to a suitable range according to the reaction requirement, then the motor drives the stirring rod to rotate, the first stirring paddle preliminarily stirs the reactants in the kettle body, with the rotation of the stirring rod, the spiral plate lifts the reactants upward from the bottom of the kettle body to form the axial circulating flow, thereby enhancing the mixing effect of the materials, the first baffle can increase the turbulence degree of the materials, so that the materials can be fully mixed in the horizontal direction, the second stirring paddle further cuts and stirs the materials with the rotation of the stirring rod, so as to effectively break the bubble agglomeration in the materials and promote the rising and discharge of the bubbles, and the three stirring structures are matched with each other to realize the omnibearing and multilevel stirring of the reactants in the kettle body, thereby ensuring the uniform mixing of the reactants and the full reaction of the reactants.
[0009] In a preferred scheme, the outer wall of the second stirring paddle is sawtooth-shaped, and the second stirring paddle has an angle of thirty degrees with the horizontal plane.
[0010] In this scheme, the design can cut and push the materials during the stirring process, so that the materials can be fully stirred in the horizontal direction and the vertical direction, the bubble agglomeration in the materials is broken, and the discharge of the bubbles is promoted.
[0011] In a preferred scheme, the second stirring paddle is staggered with the first stirring paddle, the two connection frames are symmetrically distributed about the center line of the stirring rod, a plurality of equally spaced scrapers are arranged on the other outer wall of the connection frame, the scrapers are fan-shaped structures, both sides of the scrapers are designed with round corners, and the outer wall on one side of the scraper is in contact with the inner wall of the circumference of the kettle body.
[0012] In this design, the staggered distribution of the first and second stirring paddles allows for more comprehensive and detailed mixing of the materials inside the vessel when the stirring rod rotates. In traditional stirring methods, dead zones may occur, meaning some materials cannot be fully mixed. However, the staggered distribution of the paddles covers all areas of the vessel, reducing the formation of dead zones and ensuring that all materials participate in the reaction, thus improving the uniformity and consistency of the reaction. When the stirring rod rotates, the scraper can move in a circular motion along the inner wall of the vessel, promptly scraping off the materials adhering to the inner wall and preventing scaling and adhesion. This not only ensures the full reaction of the materials but also avoids problems such as reduced heat transfer efficiency and prolonged reaction time caused by materials sticking to the wall.
[0013] As described above, a prepolymer vacuum reactor includes a reactor body. The top outer wall of the reactor body is provided with a feed pipe, a frame, and an exhaust pipe. One end of the exhaust pipe is fixedly connected to a vacuum pump. The reactor also includes a motor mounted on the top outer wall of the frame. The output shaft of the motor is fixedly connected to a stirring rod, one end of which extends into the interior of the reactor body. The circumferential outer wall of the stirring rod is provided with a first baffle and three equidistantly distributed first stirring paddles. The first baffle is located above the first stirring paddles. The bottom outer wall of the first baffle is provided with two connecting frames. One side outer wall of each connecting frame is provided with three equidistantly distributed second stirring paddles. The prepolymer vacuum reactor provided by this invention effectively reduces the bubble content in the prepolymer, improves the density and stability of the prepolymer, and avoids the performance degradation of the prepolymer caused by bubbles. Attached Figure Description
[0014] Figure 1 This is a schematic diagram of the overall structure of a prepolymer vacuum reactor proposed in this utility model.
[0015] Figure 2 This is a cross-sectional view of a prepolymer vacuum reactor proposed in this utility model.
[0016] Figure 3 This is a schematic diagram of the second stirring paddle and scraper structure of a prepolymer vacuum reactor proposed in this utility model.
[0017] Figure 4 This is a schematic diagram of the second baffle and spiral plate structure of a prepolymer vacuum reactor proposed in this utility model.
[0018] In the attached diagram: 1. Kettle body; 2. Feed pipe; 3. Exhaust pipe; 4. Steam inlet; 5. Drain outlet; 6. Discharge outlet; 7. Motor; 8. First baffle; 9. Scraper; 10. First stirring paddle; 11. Connecting frame; 12. Second stirring paddle; 13. Stirring rod; 14. Spiral plate; 15. Second baffle. Detailed Implementation
[0019] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and marked in the accompanying drawings can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely represents selected embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.
[0020] The prepolymer vacuum reactor disclosed in this utility model is mainly used in the traditional prepolymer vacuum reactor vacuum stirring reaction process. Some raw materials contain volatile substances. Under vacuum stirring and heating conditions, these substances volatilize and form bubbles. The bubbles will occupy the space inside the reactor, reduce the actual contact area of the reactants, reduce the reaction efficiency, and may also change the internal structure of the prepolymer, thereby reducing the physical and chemical properties of the product.
[0021] Reference Figure 1 , Figure 2 and Figure 3 A prepolymer vacuum reactor includes a reactor body 1. The top outer wall of the reactor body 1 is provided with a feed pipe 2, a frame, and an exhaust pipe 3. One end of the exhaust pipe 3 is fixedly connected to a vacuum pump. The reactor body 1 also includes a motor 7 on the top outer wall of the frame. The output shaft of the motor 7 is fixedly connected to a stirring rod 13. One end of the stirring rod 13 extends into the interior of the reactor body 1. The circumferential outer wall of the stirring rod 13 is provided with a first baffle 8 and three equally spaced first stirring paddles 10. The first baffle 8 is located above the first stirring paddles 10. The bottom outer wall of the first baffle 8 is provided with two connecting frames 11. One side outer wall of the connecting frame 11 is provided with three equally spaced second stirring paddles 12.
[0022] Among them, a spiral plate 14 is provided between two adjacent first stirring paddles 10. The spiral plate 14 is wrapped around the outer circumference of the stirring rod 13. The spiral plate 14 enables the material to form an axial circulation flow in the vessel body 1, which enhances the mixing effect of the material, promotes the full contact and reaction of the material, and further improves the reaction efficiency.
[0023] In the specific implementation process, the outer wall of the second stirring paddle 12 is serrated, and the angle between the second stirring paddle 12 and the horizontal plane is 30 degrees. This design can cut and push the material during the stirring process, so that the material can be fully stirred in both the horizontal and vertical directions, breaking the agglomeration of air bubbles in the material and promoting the discharge of air bubbles.
[0024] Specifically, the vessel body 1 is securely installed in a suitable position, and the exhaust pipe 3 is reliably connected to the vacuum pump, ensuring a good seal at the connection to prevent air leakage. The raw materials required for the prepolymer reaction are slowly added to the vessel body 1 through the feed pipe 2 according to the prescribed ratio and sequence. Then, the vacuum pump is started to evacuate the vessel body 1. During the evacuation process, the vacuum gauge reading is closely observed, and the vacuum level inside the vessel body 1 is adjusted to a suitable range according to the reaction requirements. Then, the motor 7 drives the stirring rod 13 to rotate, and the first stirring paddle 10 initially stirs the reactants inside the vessel body 1. As the stirring rod 13 rotates, the spiral plate 14 lifts the reactants from the bottom of the vessel body 1 upwards, forming... The axial circulating flow enhances the mixing effect of materials. The first baffle 8 increases the turbulence of the materials, ensuring thorough mixing even in the horizontal direction. The second stirring paddle 12, rotating with the stirring rod 13, further cuts and stirs the materials, effectively breaking up bubble agglomerations and promoting bubble rise and discharge. The three stirring structures work together to achieve all-round, multi-level stirring of the reactants within the vessel 1, ensuring uniform mixing and thorough reaction. This device effectively reduces the bubble content in the prepolymer during stirring, improving the density and stability of the prepolymer and preventing performance degradation caused by bubbles.
[0025] Reference Figure 2 In a preferred embodiment, the second stirring paddle 12 and the first stirring paddle 10 are staggered, and the two connecting frames 11 are symmetrically distributed about the center line of the stirring rod 13. Several scrapers 9 are evenly distributed on the outer wall of the other side of the connecting frame 11. The scrapers 9 have a fan-shaped structure and both sides of the scrapers 9 are rounded. One side of the outer wall of the scraper 9 is in contact with the inner circumference of the vessel body 1.
[0026] Specifically, the staggered distribution of the first stirring paddle 10 and the second stirring paddle 12 allows the stirring rod 13 to rotate, enabling the stirring paddles to more comprehensively and meticulously stir the materials inside the vessel 1. In traditional stirring methods, dead zones may occur, meaning that some materials cannot be fully stirred. However, the staggered distribution of the paddles can cover all areas of the vessel 1, reducing the generation of dead zones and ensuring that all materials can participate in the reaction, thus improving the uniformity and consistency of the reaction. When the stirring rod 13 rotates, the scraper 9 can move in a circular motion along the inner wall of the vessel 1, promptly scraping off the materials adhering to the inner wall and preventing scale and adhesion of materials on the inner wall of the vessel 1. This not only ensures the full reaction of the materials but also avoids problems such as reduced heat transfer efficiency and prolonged reaction time in the vessel 1 caused by materials sticking to the wall.
[0027] Reference Figure 2 and Figure 4In a preferred embodiment, a second baffle 15 is provided on the bottom outer wall of one of the first stirring paddles 10, and a plurality of first limiting holes and a plurality of second limiting holes are respectively provided on the top outer walls of the first baffle 8 and the second baffle 15. The second baffle 15 is located on the bottom inner wall of the vessel body 1, and a discharge port 6 is provided on the bottom outer wall of the vessel body 1.
[0028] The first baffle 8 has an umbrella-shaped structure. The inclined design of the umbrella-shaped first baffle 8 can guide the material to flow downward from the edge of the first baffle 8, forming a centripetal liquid flow. This flow pattern causes the bubbles to be concentrated and pushed upward below the first baffle 8, accelerating the migration of the bubbles to the liquid surface. In addition, the curved structure of the first baffle 8 can prevent the bubbles from being re-entered into the liquid flow during the rising process, thereby reducing the secondary dispersion and residue of the bubbles.
[0029] Specifically, the second baffle 15, through its synergistic effect with the first stirring paddle 10, can enhance the fluidity and turbulence of the material at the bottom of the vessel 1. The first and second limiting holes can create local fluid disturbances, further promoting the breakup and floating of bubbles, breaking the laminar flow state of the material, and making it easier for bubbles to be broken and separated from the liquid phase.
[0030] Reference Figure 1 and Figure 2 In a preferred embodiment, the outer circumferential wall of the vessel body 1 is provided with a steam inlet 4 and a drain outlet 5. The steam inlet 4 is located diagonally above the drain outlet 5, and the drain outlet 5 is located on the outer circumferential wall of the vessel body 1 near the bottom.
[0031] Working principle: During use, the vessel body 1 is securely installed in a suitable position, and the exhaust pipe 3 is reliably connected to the vacuum pump, ensuring a good seal at the connection to prevent air leakage. The raw materials required for the prepolymer reaction are slowly added to the vessel body 1 through the feed pipe 2 in the prescribed proportion and order. Then, the vacuum pump is started to evacuate the vessel body 1. During the evacuation process, the vacuum gauge reading is closely observed, and the vacuum degree in the vessel body 1 is adjusted to a suitable range according to the reaction requirements. Then, the motor 7 drives the stirring rod 13 to rotate. The first stirring paddle 10 initially stirs the reactants in the vessel body 1. As the stirring rod 13 rotates, the spiral plate 14 lifts the reactants from the bottom of the vessel body 1 upwards, forming an axial circulating flow, which enhances the mixing effect of the materials. The first baffle 8 can increase the turbulence of the materials, so that the materials can be fully mixed in the horizontal direction. The second stirring paddle 12, with the rotation of the stirring rod 13, further cuts and stirs the materials, which can effectively break the agglomeration of air bubbles in the materials and promote the rise and discharge of air bubbles.
[0032] The above description is merely a preferred embodiment of this utility model, but the protection scope of this utility model is not limited thereto. The substitutions may be replacements of some structures, devices, or method steps, or they may be complete technical solutions. Equivalent substitutions or modifications made based on the technical solution and inventive concept of this utility model should all be covered within the protection scope of this utility model.
Claims
1. A prepolymer vacuum reactor, comprising a reactor body (1), characterized in that, The top outer wall of the vessel body (1) is provided with a feed pipe (2), a frame and an exhaust pipe (3). One end of the exhaust pipe (3) is fixedly connected to a vacuum pump. The vessel body (1) also includes a motor (7) on the top outer wall of the frame. The output shaft of the motor (7) is fixedly connected to a stirring rod (13). One end of the stirring rod (13) extends into the interior of the vessel body (1). The outer circumference of the stirring rod (13) is provided with a first baffle (8) and three equally spaced first stirring paddles (10). The first baffle (8) is located above the first stirring paddles (10). The bottom outer wall of the first baffle (8) is provided with two connecting frames (11). One side outer wall of the connecting frame (11) is provided with three equally spaced second stirring paddles (12).
2. The prepolymer vacuum reactor according to claim 1, characterized in that, A spiral plate (14) is provided between two adjacent first stirring paddles (10), and the spiral plate (14) is wrapped around the outer circumference of the stirring rod (13).
3. The prepolymer vacuum reactor according to claim 2, characterized in that, The outer wall of the second stirring paddle (12) is serrated, and the angle between the second stirring paddle (12) and the horizontal plane is 30 degrees.
4. The prepolymer vacuum reactor according to claim 1, characterized in that, The second stirring paddle (12) is staggered with the first stirring paddle (10). The two connecting frames (11) are symmetrically distributed about the center line of the stirring rod (13). Several scrapers (9) are provided on the outer wall of the other side of the connecting frame (11). The scraper (9) is a fan-shaped structure and both sides of the scraper (9) are rounded. The outer wall of one side of the scraper (9) is in contact with the inner circumference of the vessel body (1).
5. A prepolymer vacuum reactor according to claim 4, characterized in that, One of the first stirring paddles (10) has a second baffle (15) on its bottom outer wall. The top outer walls of the first baffle (8) and the second baffle (15) are respectively provided with a number of first limiting holes and a number of second limiting holes. The second baffle (15) is located on the bottom inner wall of the vessel body (1). The bottom outer wall of the vessel body (1) is provided with a discharge port (6).
6. A prepolymer vacuum reactor according to claim 5, characterized in that, The first baffle (8) has an umbrella-shaped structure.
7. A prepolymer vacuum reactor according to claim 1, characterized in that, The outer circumferential wall of the vessel body (1) is provided with a steam inlet (4) and a drain outlet (5). The steam inlet (4) is located diagonally above the drain outlet (5), and the drain outlet (5) is located on the outer circumferential wall of the vessel body (1) near the bottom.