Multi-stage feeding reaction kettle for preparing PU adhesive
By designing the graded over-film plate and multi-stage material holes in the reaction kettle for preparation of PU adhesives, combined with the multi-stage stirring paddle, the problems of long mixing time and low stirring efficiency in the existing reactor are solved, and high-quality preparation of PU adhesives is achieved.
Patent Information
- Application Number
- CN202422249388.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-13
- Publication Date
- 2025-06-27
- Estimated Expiration
- 2034-09-13
AI Technical Summary
The existing reaction kettle for preparation of PU adhesives has a single reaction space, and the time required for full mixing of raw materials is too long to ensure the preparation quality of PU adhesives; multi-stage feeding cannot be carried out, and the stirring time and mixing degree of each raw material in the reactor cannot be controlled; the stirring efficiency is low, resulting in unstable preparation quality.
A multi-stage feed reactor is designed, using a graded feed plate and multi-stage feed hole, combined with a multi-stage stirring paddle, ensuring that the raw materials are fully mixed in the reactor, realizing multi-stage feed and controlling the stirring time and mixing degree.
Through the design of the graded feed plate and multi-stage material holes, the full mixing of raw materials is ensured and the preparation quality of PU adhesive is improved. The multi-stage stirring paddle improves the stirring efficiency and ensures that the raw materials are fully mixed when discharged.
Smart Images
Figure CN223027340U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of adhesive preparation, in particular to a multi-stage feeding reactor for preparing PU adhesive. Background Art
[0002] PU adhesive, also known as polyurethane adhesive, is a high-performance adhesive, and its molecular chain contains urethane group (-NHCOO-) or isocyanate group (-NCO). This adhesive is obtained by the reaction of isocyanate and hydroxyl-containing compounds such as polyester and polyether, and has excellent physical properties and a wide range of bonding applications. The advantages of PU adhesive include high reactivity, room temperature curing ability, and good bonding properties to various materials such as metal, rubber, glass, ceramic, plastic, etc. The preparation of PU adhesive requires preparing raw materials for batching, stirring the batched raw materials to make the raw materials fully mixed, ensuring that each portion of the raw material can be evenly distributed. The reactor is the key equipment for producing water-based PU adhesive, and it produces environmentally friendly, high-quality, energy-efficient and high-performance PU adhesive through processes such as mixing, reaction and polymerization.
[0003] During the reaction process, factors such as reaction temperature, time and pressure need to be controlled. At the same time, during the reaction process, a certain amount of auxiliary agents such as catalysts and stabilizers are added to ensure the bonding strength and aging resistance of the product. The internal reaction space of the existing reactor for preparing PU adhesive is single, and the time required for the raw materials to be fully mixed is too long, which cannot guarantee the preparation quality of PU adhesive; the existing reactor for preparing PU adhesive cannot perform multi-stage feeding and cannot control the stirring time and mixing degree of each raw material in the reactor; due to the high viscosity of PU adhesive, the stirring difficulty is high, and the stirring paddle of the existing reactor for preparing PU adhesive is single, and the stirring efficiency is low, resulting in unstable preparation quality, and there may be some raw materials that are not fully mixed during discharging. Summary of the Utility Model
[0004] The purpose of the utility model is to provide a multi-stage feeding reactor for preparing PU adhesive, which realizes multi-stage feeding, ensures the full mixing of each portion of raw material, and effectively improves the preparation quality of PU adhesive.
[0005] To achieve the above purpose, the utility model provides the following scheme:
[0006] A multi-stage feeding reactor for preparing PU adhesive, comprising a reactor housing and a stirring device, wherein a stirring device is arranged inside the reactor housing, the stirring device passes through the center of the top of the reactor housing, and the stirring device rotates inside the reactor housing. The reactor housing includes a kettle body, a kettle cover, a kettle bottom, a support seat, a material hole group, a pressure hole and a grading feeding plate. The kettle body is in the shape of a "cylindrical tube", the kettle cover is flange-connected to the top of the kettle body, the kettle bottom is welded to the bottom of the kettle body, the shapes of the kettle cover and the kettle bottom are axisymmetric, support seats are welded to the outside of the kettle body and the bottom of the kettle bottom, the support seats are arranged in a circumferential array, the material hole group is arranged on the kettle body and the kettle cover, a pressure hole is arranged on the kettle cover, the grading feeding plates are vertically linearly arrayed inside the kettle body, and the sides of the grading feeding plates are welded to the inside of the kettle body.
[0007] Further, the support seat includes lug supports and tripod supports. There are four lug supports, which are all arranged in a circumferential array on the outside of the kettle body, and a tripod support is welded to the bottom end of the kettle bottom.
[0008] Further, the material hole group includes an upper feeding hole, a lower discharging hole and multi-stage material holes. There are three upper feeding holes, and the upper feeding holes and the pressure hole are arranged in a circumferential array on the top of the kettle cover. The lower discharging hole is arranged at the center of the kettle bottom, and the multi-stage material holes are vertically linearly arrayed on the outside of the kettle body.
[0009] Further, the grading feeding plates are divided into a first-stage feeding plate, a second-stage feeding plate, a third-stage feeding plate and a fourth-stage feeding plate. Each stage of feeding plate is linearly arrayed inside the kettle body. The grading feeding plates are distributed with feeding holes, and the areas of the feeding holes on each stage of feeding plate decrease in sequence from top to bottom, and the densities increase in sequence.
[0010] Further, the stirring device includes a motor, a frame, a stirring shaft, a seal and a stirring paddle. The motor is welded to the top of the frame, the bottom of the frame is welded to the top of the kettle cover, the top end of the stirring shaft is rotationally connected to the bottom of the motor, a shaft hole is arranged at the center of the kettle cover, the stirring shaft passes through the shaft hole and is arranged inside the kettle body, the seal is fixed to the top of the kettle cover, the seal is filled between the shaft hole and the outer ring of the stirring shaft, and the stirring paddle is welded to the stirring shaft.
[0011] Furthermore, the stirring paddle includes a cross bar, vertical extension rods, vertical extension pieces, spiral pieces, and a U-shaped rod. The cross bar is divided into four groups, and each group of cross bars is respectively arranged above each stage of the material passing plate. The diameter of each group of cross bars decreases sequentially from top to bottom. The vertical extension rods are linearly arrayed on the second group of cross bars. There are two cross bars in the third group, and the top view of the two cross bars forms a 90° angle. The vertical extension pieces are linearly arrayed on the third group of cross bars. There are three cross bars in the fourth group, and the top view of the three cross bars forms a 60° angle. Spiral pieces are welded to all three cross bars. The U-shaped rod is welded to the bottom end of the stirring paddle, and the U-shaped rod is arranged below the four-stage material passing plate.
[0012] In summary, the beneficial technical effects of the present utility model are as follows:
[0013] 1. By adopting a multi-stage material passing plate, the raw materials need to pass through the four-stage material passing plate before they can be discharged, ensuring the full mixing of the raw materials in the reaction kettle, ensuring that each portion of the raw materials can be evenly distributed, and improving the preparation quality of the PU adhesive;
[0014] 2. By selecting multi-stage feed holes, with separate feed holes provided in each stage of the stirring area, multi-stage feeding can be achieved, controlling the stirring time and mixing degree of different raw materials in the reaction kettle;
[0015] 3. By applying a stirring paddle, the stirring gradually becomes denser from the feed port to the discharge hole, ensuring that the raw materials are fully mixed when they reach the discharge hole. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] Figure 1 is a schematic diagram of the overall structure of the present utility model;
[0017] Figure 2 is a schematic diagram of the outer shell structure of the present utility model;
[0018] Figure 3 is a schematic diagram of the stirring structure of the present utility model.
[0019] 1. Reaction kettle outer shell; 2. Stirring device; 11. Kettle body; 12. Kettle cover; 13. Kettle bottom; 14. Support seat; 15. Material hole group; 16. Pressurization hole; 17. Multi-stage material passing plate; 21. Motor; 22. Frame; 23. Stirring shaft; 24. Seal; 25. Stirring paddle; 141. Ear type support; 142. Tripod support; 151. Upper feed hole; 152. Lower discharge hole; 153. Multi-stage material hole; 171. First-stage material passing plate; 172. Second-stage material passing plate; 173. Third-stage material passing plate; 174. Fourth-stage material passing plate; 175. Material passing hole; 251. Cross bar; 252. Vertical extension rod; 253. Vertical extension piece; 254. Spiral piece; 255. U-shaped rod. DETAILED DESCRIPTION OF THE EMBODIMENTS
[0020] The present utility model will be further described in detail below in conjunction with the accompanying drawings.
[0021] The utility model discloses a multi-stage feeding reactor for preparing PU adhesive, comprising a reactor shell 1 and a stirring device 2. The material of the reactor shell 1 is made of strong acid and alkali resistant stainless steel. The reactor shell 1 is provided with the stirring device 2, which passes through the top center of the reactor shell 1. The stirring device 2 rotates inside the reactor shell 1, and the stirring device 2 stirs and mixes the raw materials. The reactor shell 1 comprises a reactor body 11, a reactor cover 12, a reactor bottom 13, a support seat 14, a material hole group 15, a pressurizing hole 16 and a graded feeding plate 17. The reactor body 11 is in the shape of a "cylindrical tube", the reactor cover 12 is flange-connected to the top of the reactor body 11, the reactor bottom 13 is welded to the bottom of the reactor body 11, the reactor cover 12 and the reactor bottom 13 are axisymmetric, and the connection between the reactor cover 12, the reactor body 11 and the reactor bottom 13 is sealed, which is used to receive the raw materials. The outside of the kettle body 11 and the bottom of the kettle bottom 13 are welded with a support seat 14, and the support seat 14 is in a circular array. The support seat 14 places the reactor vertically for easy loading and unloading of materials. The support seat 14 includes an ear-type support 141 and a tripod support 142. There are four ear-type supports 141, which are all arranged in a circular array on the outside of the kettle body 11. The ear-type support 141 securely fixes the reactor on the supporting structure and evenly distributes the weight of the reactor on the supporting structure, which is transferred to the ground through the supporting structure, thereby reducing the weight and stress borne by the reactor and avoiding the shaking and tilting of the kettle body 11 during operation, thereby ensuring the stability and safety of the reactor. A tripod support 142 is welded at the bottom of the kettle bottom 13. When the reactor stops working, the weight of the reactor is borne by the tripod, which occupies a small area and has stable support. The material hole group 15 is arranged on the kettle body 11 and the kettle cover 12. The raw materials enter the reactor through the material hole group 15 for stirring and mixing. The material hole group 15 includes an upper feed hole 151, a lower discharge hole 152 and a multi-stage material hole 153. There are three upper feed holes 151, which are used to add raw materials to the reactor. The upper feed holes 151 and the pressurizing holes 16 are arranged in a circular array on the top of the kettle cover 12. The lower discharge hole 152 is arranged in the center of the kettle bottom 13. The lower discharge hole 152 is used to take out the mixture obtained after the reaction from the reactor. The multi-stage material holes 153 are arranged in a vertical linear array outside the kettle body 11. The multi-stage material holes 153 are arranged between the graded feed plates 17, and raw materials and auxiliary agents can be added through the graded feed plates 17. The pressurizing hole 16 is arranged on the kettle cover 12 for pressurizing the raw material reaction and mixing. The grading feeding plates 17 are arranged in a vertical linear array in the kettle body 11, and the sides of the grading feeding plates 17 are welded to the inner side of the kettle body 11. The raw materials need to pass through the grading feeding plates 17, and when they are stirred at each layer and finally reach the discharge hole, they can be ensured to be fully mixed.The grading material passing plate 17 is divided into a primary material passing plate 171, a secondary material passing plate 172, a tertiary material passing plate 173, and a quaternary material passing plate 174. Each level of the material passing plate is arranged in a linear array within the kettle body 11. The grading material passing plate 17 is distributed with material passing holes 175. The areas of the material passing holes 175 on each level of the material passing plate decrease successively from top to bottom, and the densities increase successively. The multi-level material holes 153 are divided into three, and are respectively arranged between the primary material passing plate 171 and the secondary material passing plate 172, between the secondary material passing plate 172 and the tertiary material passing plate 173, and between the tertiary material passing plate 173 and the quaternary material passing plate 174. The multi-level material holes 153 can add raw materials or adjuvants when the raw material reaction mixture reaches a certain degree, enabling multi-level feeding and controlling the stirring time and mixing degree of different raw materials in the reaction kettle. For details, see Figure 1 、 Figure 2 。
[0022] The stirring device 2 includes a motor 21, a frame 22, a stirring shaft 23, a seal 24 and a stirring paddle 25. The motor 21 is welded to the top of the frame 22. The motor 21 is the main driving force source of the reactor. It transmits power to the reactor stirrer for mixing, homogenizing and other operations. The bottom of the frame 22 is welded to the top of the reactor cover 12. The frame 22 is used to support and fix the motor 21. The top rotating shaft of the stirring shaft 23 is connected to the bottom of the motor 21. The center of the reactor cover 12 is provided with an axial hole. The stirring shaft 23 passes through the axial hole and is arranged in the reactor body 11. The rotational power provided by the motor 21 to the stirring shaft 23 enables the stirring shaft 23 to rotate in the reactor body 11. Internal rotation stirring, the seal 24 is fixed on the top of the kettle cover 12, the seal 24 is filled between the shaft hole and the outer ring of the stirring shaft 23, the seal 24 seals the shaft hole and the stirring shaft 23 under the premise of ensuring the normal rotation of the stirring shaft 23 to prevent the raw materials from overflowing through the shaft hole, the stirring paddle 25 is welded on the stirring shaft 23, and the stirring paddle 25 is driven by the rotation of the stirring shaft 23 to stir horizontally inside the kettle body 11, the stirring paddle 25 includes a cross bar 251, a vertical extension rod 252, a vertical extension piece 253, a spiral piece 254 and a U-shaped rod 255, and the raw materials are mainly stirred by the cross bar 251, and the cross bar 251 is divided into four groups, each group The cross bars 251 are respectively arranged above each level of the feed plate, and the diameter of each group of cross bars 251 decreases from top to bottom. The vertical extension bars 252 are linearly arrayed on the second group of cross bars 251. The vertical extension bars 252 assist in stirring the raw materials by rotating the cross bars 251, thereby increasing the stirring degree of the raw materials between the first-level feed plate 171 and the second-level feed plate 172. The third group of cross bars 251 has two cross bars, and the top views of the two cross bars 251 are at an angle of 90°. The vertical extension pieces 253 are linearly arrayed on the third group of cross bars 251. The addition of the cross bars 251 makes the stirring of the raw materials more intensive, and the vertical extension pieces 253 increase the contact with the raw materials. The fourth group of cross bars 251 has three cross bars, and the top view of the three cross bars 251 is at an angle of 60°. The three cross bars 251 are all welded with spiral pieces 254. The added spiral pieces 254 cause the raw materials to produce spiral circulation stirring, ensuring the full mixing of the raw materials in the reactor, and the concentration of the reactants is evenly mixed, thereby improving the preparation quality of the PU adhesive. The U-shaped rod 255 is welded to the bottom end of the stirring paddle 25, and the U-shaped rod 255 is arranged below the fourth-level feed plate 174. After the raw materials are reacted and mixed, they need to be discharged through the lower discharge port. The stirring of the U-shaped rod 255 plays an auxiliary role in the discharge, which is convenient for faster and more complete discharge. For details, see Figure 3 .
[0023] Example
[0024] Operation process
[0025] 1. Fix the reaction kettle on the bracket through the ear-type support 141, and then prepare the raw materials for preparing the PU adhesive;
[0026] 2. Open the upper feed hole 151, and then start the motor 21 to rotate the stirring paddle 25;
[0027] 3. Put the prepared raw materials into the reaction kettle through different upper feed holes 151, mix them in a certain proportion, and conduct layer-by-layer reactions through the grading feed plate 17;
[0028] 4. According to the characteristics of different raw materials, after the raw materials put in through the upper feed hole 151 are mixed, they enter the next layer through the first-stage feed plate 171. Different raw materials, as well as auxiliary agents such as catalysts and stabilizers, can be added through multiple feed holes to achieve the effect of grading and mixing of raw materials and realize multi-stage feeding;
[0029] 5. The reaction mixture of the raw materials is gradually mixed thoroughly with the filtration of the grading feed plate 17. With the assistance of the U-shaped rod for stirring, the reactants are discharged through the lower discharge port to complete the preparation.
[0030] The embodiments of this specific implementation manner are all preferred embodiments of the present invention, and do not limit the protection scope of the present invention accordingly. Therefore, all equivalent changes made according to the structure, shape, and principle of the present invention shall be covered within the protection scope of the present invention.
Claims
1. A multi-stage feeding reactor for preparing PU adhesive, comprising a reactor shell (1) and a stirring device (2), characterized in that: The reactor shell (1) is provided with a stirring device (2) therein. The stirring device (2) passes through the top center of the reactor shell (1). The stirring device (2) rotates inside the reactor shell (1). The reactor shell (1) comprises a reactor body (11), a reactor cover (12), a reactor bottom (13), a support seat (14), a material hole group (15), a pressure hole (16) and a graded material plate (17). The reactor body (11) is in the shape of a "cylindrical tube". The reactor cover (12) is flange-connected to the top of the reactor body (11). (11) A bottom of the kettle (13) is welded to the bottom, the kettle cover (12) and the kettle bottom (13) are axially symmetrical in shape, a support seat (14) is welded to the outside of the kettle body (11) and the bottom of the kettle bottom (13), the support seat (14) is in a circular array, the material hole group (15) is arranged on the kettle body (11) and the kettle cover (12), the kettle cover (12) is provided with a pressurizing hole (16), the graded material passing plate (17) is vertically linearly arrayed in the kettle body (11), and the side of the graded material passing plate (17) is welded to the inside of the kettle body (11).
2. The multi-stage feeding reactor for preparing PU adhesive according to claim 1, characterized in that: The support seat (14) comprises an ear-type support (141) and a tripod support (142). There are four ear-type supports (141) arranged in a circular array outside the kettle body (11). The bottom end of the kettle bottom (13) is welded with a tripod support (142).
3. The multi-stage feeding reactor for preparing PU adhesive according to claim 1, characterized in that: The material hole group (15) comprises an upper material feed hole (151), a lower material discharge hole (152) and a multi-stage material hole (153). There are three upper material feed holes (151). The upper material feed holes (151) and the pressurizing holes (16) are arranged in a circular array on the top of the kettle cover (12). The lower material discharge hole (152) is arranged at the center of the kettle bottom (13). The multi-stage material holes (153) are arranged in a vertical linear array on the outside of the kettle body (11).
4. The multi-stage feeding reactor for preparing PU adhesive according to claim 1, characterized in that: The graded material passing plates (17) are divided into a primary material passing plate (171), a secondary material passing plate (172), a tertiary material passing plate (173) and a quaternary material passing plate (174). Each grade of material passing plates is arranged in a linear array in the kettle body (11). Material passing holes (175) are distributed on the graded material passing plates (17). The material passing holes (175) on each grade of material passing plates decrease in area from top to bottom and increase in density.
5. The multi-stage feeding reactor for preparing PU adhesive according to claim 1, characterized in that: The stirring device (2) comprises a motor (21), a frame (22), a stirring shaft (23), a sealing member (24) and a stirring paddle (25); the motor (21) is welded to the top of the frame (22); the bottom of the frame (22) is welded to the top of the kettle cover (12); the top end rotating shaft of the stirring shaft (23) is connected to the bottom of the motor (21); an axial hole is arranged at the center of the kettle cover (12); the stirring shaft (23) passes through the axial hole and is arranged in the kettle body (11); the sealing member (24) is fixed to the top of the kettle cover (12); the sealing member (24) is filled between the axial hole and the outer ring of the stirring shaft (23); and the stirring paddle (25) is welded to the stirring shaft (23).
6. The multi-stage feeding reactor for preparing PU adhesive according to claim 5, characterized in that: The stirring paddle (25) comprises a cross bar (251), a vertical extension bar (252), a vertical extension piece (253), a spiral piece (254) and a U-shaped bar (255); the cross bar (251) is divided into four groups; each group of cross bars (251) is respectively arranged above each level of the material passing plate; the diameter of each group of cross bars (251) decreases from top to bottom; the vertical extension bars (252) are linearly arranged on the second group of cross bars (251); the third group of cross bars (251) has two The top views of the two cross bars (251) are at an angle of 90°, the vertical extension pieces (253) are linearly arrayed on the third group of cross bars (251), the fourth group of cross bars (251) has three cross bars, the top views of the three cross bars (251) are at an angle of 60°, the three cross bars (251) are all welded with spiral pieces (254), the U-shaped rod (255) is welded to the bottom end of the stirring paddle (25), and the U-shaped rod (255) is arranged below the fourth-stage feed plate (174).