A pressure-sensitive adhesive production apparatus and production method

Abstract

This invention relates to the field of pressure-sensitive adhesive (PSA) production, and in particular to a PSA production apparatus and method. Addressing the problems of uneven mixing of upper and lower layers and slow discharge speed in existing PSA production apparatuses, the invention proposes the following solution: a material-holding mechanism comprising a base and a reaction tank mounted on top of the base; a stirring mechanism comprising a stirring shaft rotatably connected to and coaxially arranged with the inner wall of the top of the reaction tank, and multiple sets of stirring components fixed to the outer periphery of the stirring shaft; and a material-turning mechanism installed inside the reaction tank to turn the material at the bottom layer to the top layer when the stirring shaft rotates. This invention achieves coordinated operation of the stirring mechanism and the material-turning mechanism. The stirring mechanism radially stirs the material inside the reaction tank, while the material-turning mechanism turns the bottom layer material to the top layer, breaking the stratification of the material and fundamentally solving the problem of uneven mixing in traditional apparatuses, thereby improving the performance stability of the PSA product.

Description

Technical Field

[0001] This invention relates to the field of pressure-sensitive adhesive production, and more particularly to a pressure-sensitive adhesive production apparatus and production method. Background Technology

[0002] Pressure-sensitive adhesives (PSAs) are adhesives that are sensitive to pressure, bond with slight pressure, and leave no residue after peeling. They are widely used in packaging, electronics, medical, and building materials industries. During the production of PSAs, the uniformity of material mixing directly determines the product's performance. However, most existing PSA production equipment uses a single stirring shaft driving a stirring paddle, which only achieves surface mixing of the materials. The materials at the bottom of the reaction tank are difficult to mix thoroughly with the materials at the top, easily leading to uneven component distribution and resulting in significant fluctuations in the adhesive strength, holding power, and other performance indicators of the PSAs.

[0003] Meanwhile, pressure-sensitive adhesive materials themselves have a certain degree of viscosity. Existing production equipment relies solely on the material's own gravity for discharge, resulting in slow discharge speeds and easy residue buildup on the inner wall of the reaction tank and at the discharge pipe. This not only reduces production efficiency but also leads to material waste and makes cleaning difficult. Therefore, this solution proposes a pressure-sensitive adhesive and its production equipment. Summary of the Invention

[0004] The present invention proposes a pressure-sensitive adhesive and its production device, which solves the problems of uneven mixing of upper and lower layers of materials and slow discharge speed in the existing pressure-sensitive adhesive production device.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: In a first aspect, this application provides a production apparatus for pressure-sensitive adhesives, comprising: A material-containing mechanism, comprising a base and a reaction vessel mounted on top of the base; The stirring mechanism includes a stirring shaft rotatably connected to and coaxially arranged with the inner wall of the top of the reaction vessel, and multiple sets of stirring components fixed to the outer periphery of the stirring shaft; A material turning mechanism is installed inside the reaction tank and is used to turn the material at the bottom of the reaction tank to the top when the stirring shaft rotates. The material turning mechanism includes a gear ring coaxially fixed to the inner ring of the reaction tank and multiple sets of material turning components installed on the stirring shaft. The material turning components include a rotating shaft rotatably connected to the outer circumference of the stirring shaft, a sleeve movably sleeved on the outer circumference of the rotating shaft and able to rotate synchronously with it, and a spiral shaft located directly below the sleeve and connected to it in transmission. One end of the rotating shaft is fixed with a linkage gear that meshes with the gear ring. The stirring shaft is also equipped with a drive assembly for driving the sleeve and the spiral shaft to reciprocate along the length of the spiral shaft while the shaft rotates.

[0006] The above technical solution enables the coordinated operation of the stirring mechanism and the material turning mechanism. The stirring mechanism can radially stir the material in the reaction tank, while the material turning mechanism can turn the bottom material to the top, breaking the layering of the material. At the same time, the drive component drives the core component of the material turning mechanism to move back and forth, realizing all-round mixing of the material. This fundamentally solves the problem of uneven material mixing in traditional devices and improves the performance stability of pressure-sensitive adhesive products.

[0007] As a further improvement to the above solution, the drive assembly includes a gear ring assembly fixed to the inner ring of the reaction vessel and multiple sets of drive components disposed on the outer periphery of the stirring shaft and cooperating with the gear ring assembly. The gear ring assembly includes multiple alternating upper and lower gear rings, both of which are coaxially arranged with the stirring shaft. Adjacent upper and lower gear rings are staggered vertically, and the top view of multiple upper and lower gear rings forms a complete ring. The gear ring is located below the gear ring assembly, and multiple drive components are respectively disposed directly above multiple rotating shafts.

[0008] As a further improvement to the above solution, the driving component includes a transmission screw fixed to its outer periphery along the radial direction of the reaction vessel, a moving block threaded onto the outer periphery of the transmission screw, and a transmission gear fixed to the end of the transmission screw away from the stirring shaft. The transmission gear cooperates with an upper gear ring and a lower gear ring, so that when it meshes with the upper gear ring, it rotates forward while following the revolution of the stirring rod, and when it meshes with the lower gear ring, it rotates in reverse while following the revolution of the stirring rod. Two connecting plates are fixed to the bottom of the moving block, and both connecting plates are rotatably sleeved on the outer periphery of the sleeve. The spiral shaft is rotatably connected to the two connecting plates.

[0009] As a further improvement to the above scheme, a feed pipe communicating with the interior is installed on one side of the top of the reaction vessel, and a sealing cap is threadedly connected to the inlet of the feed pipe. A discharge pipe is installed on one side of the bottom of the reaction vessel, and a valve is installed on the discharge pipe.

[0010] As a further improvement to the above solution, the stirring component includes multiple stirring blades fixed to the outer periphery of the stirring shaft along the radial direction of the reaction vessel and scrapers fixed to the ends of the multiple stirring blades away from the stirring shaft. The multiple stirring blades are distributed sequentially from top to bottom, and the scrapers are arranged along the axial direction of the reaction vessel, with one long side of the scraper abutting against the inner wall of the reaction vessel.

[0011] As a further improvement to the above solution, a power mechanism for driving the stirring shaft to rotate is installed on the top of the reaction vessel. The power mechanism includes a mounting bracket installed on the top of the reaction vessel and a stirring motor installed on the mounting bracket. The top of the stirring shaft extends above the reaction vessel and is connected to the output shaft of the stirring motor.

[0012] As a further improvement to the above solution, a pressurizing mechanism for pressurizing the reactor during discharge is installed on the top of the reactor. The pressurizing mechanism includes two sets of air cylinders installed on the top of the reactor and a transmission component installed on the top of the reactor for continuously supplying gas from the two air cylinders to the reactor when the stirring shaft rotates. The two air cylinders are arranged opposite each other and are located on both sides of the stirring shaft. A piston plate is installed in each of the two air cylinders. An inlet pipe and an outlet pipe are installed on the side of the two air cylinders that are far apart from each other. A one-way valve is installed on both the inlet pipe and the outlet pipe. The other end of the two inlet pipes is connected to a gas delivery pipe through a three-way pipe. The other end of the gas delivery pipe extends into the reactor. A first valve is installed on the gas delivery pipe to control the input of air into the reactor. A pressure relief pipe is also installed on the gas delivery pipe. The pressure relief pipe is located at the end of the first valve that is far away from the end that communicates with the inner wall of the reactor. A second valve is installed on the pressure relief pipe. The second valve cooperates with the first valve to control the exhaust path of the air in the gas delivery pipe.

[0013] As a further improvement to the above solution, the transmission assembly includes a fixed gear sleeved on the outer periphery of the stirring shaft and a connecting frame located outside the fixed gear. Piston rods are fixed on the short outer walls of both sides of the connecting frame. One end of each piston rod extends into the two air cylinders and is fixedly connected to the corresponding piston plates. The fixed gear is an incomplete gear. The long inner walls of both sides of the connecting frame are provided with tooth grooves that cooperate with the fixed gear.

[0014] Secondly, this application provides a method for producing a pressure-sensitive adhesive, which uses the aforementioned pressure-sensitive adhesive production apparatus. The pressure-sensitive adhesive comprises the following components by weight: 60-80 parts of isooctyl acrylate, 10-20 parts of butyl acrylate, 5-10 parts of methyl methacrylate, 2-5 parts of acrylic acid, 0.3-0.8 parts of initiator, 15-25 parts of tackifying resin, 3-8 parts of softener, 0.2-0.5 parts of antioxidant, and 100-150 parts of deionized water. The production method includes the following steps: Preparation: Weigh each raw material according to the above-mentioned weight proportions and set aside; Feeding: Open the sealed lid and add deionized water, isooctyl acrylate, butyl acrylate, methyl methacrylate, and acrylic acid into the reaction vessel, then close the sealed lid; Stirring and mixing: Start the stirring motor to drive the stirring shaft to rotate at a speed of 150r / min-200r / min. The stirring paddle radially stirs the material in the reaction tank, and the scraper removes the material adhering to the tank wall. At the same time, the stirring shaft drives the material turning component to revolve. The linkage gear meshes with the gear ring to drive the rotating shaft to rotate, which in turn drives the spiral shaft to rotate, turning the bottom material to the upper layer. The transmission gear meshes alternately with the upper and lower gear rings of the gear ring assembly, driving the transmission screw to rotate in both directions. This causes the moving block to move back and forth along the transmission screw, which in turn drives the spiral shaft to move back and forth radially along the reaction tank. Stir for 15min-25min. Polymerization reaction: Slowly add the initiator into the reaction vessel, keep the stirring motor speed constant, control the temperature inside the reaction vessel at 70℃-80℃, and react for 2.5h-3.5h; Modification and formulation: After the reaction is complete, add tackifying resin, softener and antioxidant to the reaction vessel, and continue stirring for 30 min-40 min to ensure that the components are fully mixed; Pressurized discharge: Open the discharge valve on the discharge pipe, open the first valve and close the second valve at the same time. When the stirring shaft rotates, it drives the fixed gear to rotate. Through the connecting frame and piston rod, it drives the piston plate in the air cylinder to reciprocate. Outside air enters the air cylinder through the air inlet pipe, and then enters the reaction tank through the air outlet pipe and the air delivery pipe, increasing the air pressure in the reaction tank and pushing the material to be discharged quickly from the discharge pipe. The discharged material is then collected to obtain the pressure-sensitive adhesive finished product.

[0015] A pressure-sensitive adhesive comprises the following components by weight: 60-80 parts isooctyl acrylate, 10-20 parts butyl acrylate, 5-10 parts methyl methacrylate, 2-5 parts acrylic acid, 0.3-0.8 parts initiator, 15-25 parts tackifying resin, 3-8 parts softener, 0.2-0.5 parts antioxidant, and 100-150 parts deionized water.

[0016] Through the above technical solution, isooctyl acrylate is used as the main monomer, combined with butyl acrylate, methyl methacrylate and acrylic acid to copolymerize and form an acrylate copolymer matrix with excellent elasticity and adhesion. The initiator controls the rate and extent of the copolymerization reaction, the tackifying resin improves the adhesive strength and tack of the pressure-sensitive adhesive, the softener improves the flexibility and low-temperature performance of the adhesive layer, and the antioxidant slows down the aging rate of the adhesive layer and improves its weather resistance. The proportions of each component are optimized and work synergistically to produce a pressure-sensitive adhesive with excellent overall performance. Moreover, all raw materials are commonly used in industrial production, readily available and inexpensive.

[0017] As a further improvement to the above scheme, the initiator is one or a mixture of two of ammonium persulfate and potassium persulfate; the tackifying resin is one or a mixture of one or a mixture of terpene resin, C5 petroleum resin, and rosin glyceryl ester; the softener is one or a mixture of two of dioctyl phthalate and liquid paraffin; and the antioxidant is one or a mixture of two of antioxidant 1010 and antioxidant 168.

[0018] The above technical solutions provide a variety of optional raw materials for each functional component, adapting to different production processes and application scenarios. Ammonium persulfate and potassium persulfate are water-soluble inorganic initiators, suitable for the aqueous polymerization system of this invention, and have high initiation efficiency. Tackifying resins such as terpene resins have good compatibility with acrylate matrix and have significant tackifying effects. Dioctyl phthalate and liquid paraffin can effectively reduce the glass transition temperature of the adhesive layer and improve flexibility. Antioxidants 1010 and 168 can be used in combination to produce a synergistic antioxidant effect, greatly improving the aging resistance of the pressure-sensitive adhesive.

[0019] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. This invention achieves double-layer mixing of materials through the cooperation of a stirring mechanism and a material turning mechanism. When the stirring shaft drives the stirring paddle to rotate, the scraper can scrape off the material adhering to the inner wall of the reaction tank, preventing the material from clumping. At the same time, the spiral shaft of the material turning mechanism rotates on its own axis while revolving around the revolution, continuously turning the material at the bottom of the reaction tank to the upper layer. Combined with the radial stirring of the stirring paddle, the material is mixed in all directions, effectively improving the uniformity of material mixing and ensuring the stability of the pressure-sensitive adhesive product performance.

[0020] 2. The driving component of the present invention can drive the spiral shaft to move radially back and forth along the reaction tank, so that the material turning range of the spiral shaft covers the entire bottom area of ​​the reaction tank, completely solving the problem of insufficient mixing of bottom materials and further improving the mixing effect.

[0021] 3. By setting up the pressurization component, the inside of the reaction tank can be pressurized during discharge. The air pressure is used to push the viscous pressure-sensitive adhesive material out of the discharge pipe. Compared with the traditional gravity discharge method, the discharge speed is greatly improved. At the same time, the air pressure can push out the material residue in the inner wall of the reaction tank and the discharge pipe, reducing material waste and reducing cleaning difficulty.

[0022] 4. The pressure-sensitive adhesive formulation of the present invention, through the reasonable combination of acrylate monomers, tackifying resins, softeners and other components, produces a pressure-sensitive adhesive with high bonding strength, good tack retention and excellent temperature resistance. Moreover, the raw materials are readily available and the production cost is low, making it suitable for large-scale industrial production. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a cross-sectional view of the reaction vessel; Figure 3 This is a schematic diagram of the mixing mechanism and the material turning mechanism; Figure 4 This is a schematic diagram of the material turning mechanism; Figure 5 for Figure 4 Enlarged view of point A in the middle; Figure 6 This is a schematic diagram of the pressurization mechanism.

[0024] Explanation of key symbols: 1. Base; 2. Reaction vessel; 3. Discharge pipe; 4. Gas supply pipe; 5. First valve; 6. Pressure relief pipe; 7. Second valve; 8. Stirring motor; 9. Gas cylinder; 10. Gas outlet pipe; 11. Stirring shaft; 12. Fixed gear; 13. Gear ring assembly; 14. Gear ring; 15. Transmission gear; 16. Linkage gear; 17. Spiral shaft; 18. Stirring paddle; 19. Scraper; 20. Transmission screw; 21. Moving block; 22. Rotating shaft; 23. Sleeve; 24. Gas inlet pipe; 25. Piston rod; 26. Connecting frame; 27. Feed pipe; 28. Sealing cover; 29. ​​Connecting plate. Detailed Implementation

[0025] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments. It should be noted that, without conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments.

[0026] Example 1: Please combine Figure 1 - Figure 6 This embodiment of a pressure-sensitive adhesive production apparatus includes: The material handling mechanism includes a base 1 and a reaction vessel 2 mounted on top of the base 1. The reaction vessel is cylindrical. A feed pipe 27 communicating with the interior is installed on one side of the top of the reaction vessel 2. A sealing cap 28 is threadedly connected to the inlet of the feed pipe 27. A discharge pipe 3 is installed on one side of the bottom of the reaction vessel 2. A valve is installed on the discharge pipe 3. When adding material, the sealing cap 28 is opened, and then the material is poured into the reaction vessel 2 from the feed pipe 27. When discharging material, the valve on the discharge pipe 3 is opened.

[0027] The stirring mechanism includes a stirring shaft 11 rotatably connected to and coaxially arranged with the inner wall of the top of the reaction tank 2, and multiple sets of stirring components fixed to the outer periphery of the stirring shaft 11. Each stirring component includes multiple stirring paddles 18 fixed radially to the outer periphery of the stirring shaft 11 and scrapers 19 fixed to the ends of the stirring paddles 18 away from the stirring shaft 11. The stirring paddles 18 are distributed sequentially from top to bottom, and the scrapers 19 are arranged axially along the reaction tank 2, with one long side of the scraper 19 abutting against the inner wall of the reaction tank 2. The multi-layered stirring paddles 18 can synchronously and radially stir materials at different heights within the reaction tank 2, improving stirring efficiency. The abutting design of the scrapers 19 against the inner wall of the reaction tank 2 can remove sticky materials adhering to the tank wall in real time, preventing the material from solidifying and deteriorating due to prolonged adhesion to the tank wall, reducing material residue, improving raw material utilization, and facilitating subsequent equipment cleaning.

[0028] The top of the reaction vessel 2 is equipped with a power mechanism for driving the stirring shaft 11 to rotate. The power mechanism includes a mounting bracket installed on the top of the reaction vessel 2 and a stirring motor 8 installed on the mounting bracket. The top of the stirring shaft 11 extends above the reaction vessel 2 and is connected to the output shaft of the stirring motor 8. The stirring motor 8 is a servo motor, which drives the stirring shaft 11 to rotate.

[0029] The material turning mechanism is installed inside the reaction tank 2 and is used to turn the material at the bottom of the reaction tank 2 to the top layer when the stirring shaft 11 rotates. The material turning mechanism includes a gear ring 14 coaxially fixed to the inner ring of the reaction tank 2 and multiple sets of material turning components installed on the stirring shaft 11. The material turning components include a rotating shaft 22 rotatably connected to the outer circumference of the stirring shaft 11, a sleeve 23 movably sleeved on the outer circumference of the rotating shaft 22 and able to rotate synchronously with it, and a spiral shaft 17 located directly below the sleeve 23 and connected to it for transmission. One end of the rotating shaft 22 is fixed with a linkage gear 16 that meshes with the gear ring 14. The material turning mechanism can turn the bottom material to the top layer and break the stratification of the material.

[0030] The stirring shaft 11 is also equipped with a drive assembly for driving the sleeve 23 and the spiral shaft 17 to reciprocate along the length of the spiral shaft 17 while the rotating shaft 22 rotates. The drive assembly includes a toothed ring assembly 13 fixed to the inner ring of the reaction vessel 2 and multiple sets of drive components arranged on the outer periphery of the stirring shaft 11 and cooperating with the toothed ring assembly 13. The toothed ring assembly 13 includes multiple alternating upper and lower toothed rings, and both the upper and lower toothed rings are coaxially arranged with the stirring shaft 11. Adjacent upper and lower toothed rings are staggered vertically, and the top view of multiple upper and lower toothed rings constitutes a... A complete circular ring is formed, with the gear ring 14 located below the gear ring assembly 13. Multiple driving components are respectively positioned directly above multiple rotating shafts 22. The staggered upper and lower gear rings form a continuous tooth surface structure, allowing the driving components to alternately mesh with the upper and lower gear rings as they revolve around the stirring shaft 11, thereby realizing the forward and reverse rotation of the driving components and providing the power basis for the reciprocating movement of the material turning assembly. The vertical arrangement of the gear ring assembly 13 and the gear ring 14 ensures that the power transmission of the driving assembly and the material turning assembly does not interfere with each other, improving the stability of the device operation.

[0031] The driving components include a drive screw 20 fixed radially around the outer periphery of the reaction vessel 2, a movable block 21 threaded around the outer periphery of the drive screw 20, and a drive gear 15 fixed at the end of the drive screw 20 away from the stirring shaft 11. The drive gear 15 meshes with an upper gear ring and a lower gear ring, rotating clockwise when it meshes with the upper gear ring and revolves with the stirring shaft 11, and rotating counterclockwise when it meshes with the lower gear ring and revolves with the stirring shaft 11. Two connecting plates 29 are fixed to the bottom of the movable block 21, and both connecting plates 29 are rotatably sleeved around the outer periphery of the sleeve 23. The screw shaft 17 rotates with the two connecting plates 29. The dynamic connection converts the meshing rotation of the transmission gears into the forward and reverse rotation of the transmission screw. Then, through the threaded engagement between the screw and the moving block, the rotational motion is converted into the linear reciprocating motion of the moving block. The connecting plate 29 realizes the flexible connection between the moving block 21, the sleeve 23, and the spiral shaft 17. This ensures that the moving block 29 can drive the spiral shaft 17 to move in the radial direction of the reaction tank 2, without affecting the rotation of the rotating shaft 22, which drives the sleeve 23 and the spiral shaft 17 to rotate. This achieves a compound motion of the spiral shaft 17's revolution, rotation, and reciprocating radial movement, which greatly improves the coverage of the material turning and makes the material more thoroughly mixed.

[0032] The implementation principle of this embodiment is as follows: During production, the stirring motor 8 is started, driving the stirring shaft 11 to rotate around its own axis. The stirring shaft 11 drives the multi-layer stirring paddle 18 to rotate, radially stirring the material in the reaction tank 2. At the same time, the scraper 19 scrapes off the material attached to the tank wall. While the stirring shaft 11 rotates, it drives the material turning assembly and the driving component to revolve synchronously. During the revolution, the linkage gear 16 meshes with the fixed gear ring 14, driving the rotating shaft 22 to rotate, which in turn drives the spiral shaft 17 to rotate, turning the bottom material to the upper layer. At the same time, the transmission gear 15 alternately engages with the gear ring assembly 13. The upper and lower gear rings mesh, driving the transmission screw 20 to rotate in both directions, causing the moving block 21 to reciprocate along the transmission screw 20. Through the connecting plate 29, the spiral shaft 17 reciprocates radially along the reaction tank 2. Under the combined motion of revolution, rotation, and reciprocating radial movement, the spiral shaft 17 performs all-round turning of the material at the bottom of the reaction tank. Combined with the radial stirring of the stirring paddle, it achieves uniform mixing of the material in the reaction tank. When feeding, the sealing cover 28 is opened to add material through the feed pipe 27. After mixing is completed, the valve of the discharge pipe 3 is opened, and the initial discharge is achieved by gravity.

[0033] Example 2: Combination Figure 1 and Figure 6 This embodiment, based on Embodiment 1, further improves upon the following: A pressurizing mechanism is installed on the top of the reaction tank 2 to pressurize its interior during discharge. The pressurizing mechanism includes two sets of air cylinders 9 installed on the top of the reaction tank 2 and a transmission assembly installed on the top of the reaction tank 2 to continuously transport gas from the two air cylinders 9 to the reaction tank 2 when the stirring shaft 11 rotates. The two air cylinders 9 are arranged opposite each other and are located on both sides of the stirring shaft 11. A piston plate is installed inside each of the two air cylinders 9. An inlet pipe 24 and an outlet pipe 10 are installed on the side of each air cylinder 9 that is furthest from each other. A one-way valve is installed on both the inlet pipe 24 and the outlet pipe 10. The other end of the two inlet pipes 24 is connected to a three-way pipe... A gas supply pipe 4 is installed, with one end extending into the reaction tank 2. A first valve 5 is installed on the gas supply pipe 4 to control the input of air into the reaction tank 2. A pressure relief pipe 6 is also installed on the gas supply pipe 4, located at the end of the first valve 5 away from its connection with the inner wall of the reaction tank 2. A second valve 7 is installed on the pressure relief pipe 6, which works in conjunction with the first valve 5 to control the exhaust path of the air in the gas supply pipe 4. The rotation of the stirring shaft 11 provides power to the pressurization mechanism, realizing the secondary utilization of power and further reducing energy consumption. The piston structure of the air cylinder 9, combined with a one-way valve, enables one-way intake and compressed exhaust of external air, providing a stable air pressure source for the reaction tank 2. The coordinated control of the first valve 5 and the second valve 7 allows for flexible switching between pressurization and depressurization modes. Pressurization is performed during material discharge, and depressurization is performed during production. This solves the problem of slow discharge of viscous materials and ensures pressure balance within the reaction tank 2 during production, preventing safety accidents caused by excessive pressure.

[0034] The transmission assembly includes a fixed gear 12 sleeved around the outer periphery of the stirring shaft 11 and a connecting frame 26 located outside the fixed gear 12. Piston rods 25 are fixed to the outer walls of both short sides of the connecting frame 26. One end of each piston rod 25 extends into two air cylinders 9 and is fixedly connected to the corresponding piston plates. The fixed gear 12 is an incomplete gear, and it does not simultaneously mesh with the toothed grooves on the inner walls of the long sides of the connecting frame 26. The inner walls of both long sides of the connecting frame 26 are provided with toothed grooves that cooperate with the fixed gear 12. The intermittent meshing of the gear and the toothed groove inside the connecting frame 26 converts the continuous rotational motion of the stirring shaft 11 into the linear reciprocating motion of the connecting frame 26, which in turn drives the piston rod 25 and the piston plate to perform reciprocating piston motion inside the gas cylinder 9, realizing the intake and compression of gas. The two gas cylinders 9 are arranged opposite each other, so that the reciprocating motion of the connecting frame 26 can drive the two piston plates to work simultaneously, improving the gas compression efficiency and providing sufficient gas pressure for the reaction tank 2. This transmission structure has no complex connecting rod assembly, has a low failure rate, and has high transmission efficiency.

[0035] The implementation principle of this embodiment is as follows: Production stirring stage (pressure relief mode): Close the first valve 5 and open the second valve 7. The stirring shaft 11 rotates, which drives the fixed gear 12 to rotate. After the fixed gear 12 disengages from the long side tooth groove on one side of the connecting frame 26, it meshes with the tooth groove on the other side of the connecting frame 26, thereby driving the connecting frame 26 and the piston rod 25 to reciprocate. This drives the piston plate to reciprocate inside the air cylinder 9. The outside air drawn in by the air cylinder 9 is discharged through the air inlet pipe 24, the air delivery pipe 4, and the pressure relief pipe 6. The compressed air does not enter the reaction tank 2, ensuring the pressure balance inside the reaction tank and not affecting the polymerization, mixing and other production processes. Discharge pressurization stage (pressurization mode): Open the valve of discharge pipe 3, simultaneously open the first valve 5 and close the second valve 7. The stirring shaft 11 continues to rotate, and the pressurization mechanism continues to work. Compressed air in the air cylinder 9 enters the reaction tank 2 through the air outlet pipe 10 and the air supply pipe 4, causing the air pressure in the reaction tank to continuously increase. The high-pressure gas generates a downward thrust on the viscous pressure-sensitive adhesive material in the reaction tank. Combined with the gravity of the material, it greatly increases the discharge speed of the material from the discharge pipe 3, avoiding material residue and blockage of the discharge pipe. After the discharge is completed, the pressure relief mode is restored. The first valve 5 is closed and the second valve 7 is opened to release the residual pressure in the air supply pipe.

[0036] Example 3: Combination Figure 1 - Figure 6 In this embodiment, the pressure-sensitive adhesive is produced using the production apparatus of Example 1. The components of the pressure-sensitive adhesive by weight are: 70 parts isooctyl acrylate, 15 parts butyl acrylate, 7 parts methyl methacrylate, 3 parts acrylic acid, 0.5 parts ammonium persulfate, 20 parts terpene resin, 5 parts dioctyl phthalate, 0.3 parts antioxidant 1010, and 120 parts deionized water.

[0037] Its production process includes the following steps: Preparation: Weigh each raw material according to the above-mentioned weight proportions and set aside; Feeding: Open the sealing cover 28 and add deionized water, isooctyl acrylate, butyl acrylate, methyl methacrylate and acrylic acid into reaction vessel 2, then close the sealing cover 28; Stirring and mixing: Start the stirring motor 8, which drives the stirring shaft 11 to rotate at a speed of 150 r / min. The stirring paddle 18 performs radial stirring of the material in the reaction tank 2, and the scraper 19 scrapes off the material attached to the tank wall. At the same time, the stirring shaft 11 drives the material turning assembly to revolve. The linkage gear 16 meshes with the gear ring 14 to drive the rotating shaft 22 to rotate, which in turn drives the spiral shaft 17 to rotate, turning the bottom material to the upper layer. The transmission gear 15 meshes alternately with the upper and lower gear rings of the gear ring assembly 13, which drives the transmission screw 20 to rotate in both directions, causing the moving block 21 to move back and forth along the transmission screw 20, which in turn drives the spiral shaft 17 to move back and forth radially along the reaction tank 2, achieving all-round mixing of the material. Stir for 15 minutes. Polymerization reaction: Slowly add ammonium persulfate initiator into reaction vessel 2, keep the speed of stirring motor 8 constant, control the temperature inside reaction vessel 2 at 75℃, and react for 3 hours; Modification and formulation: After the reaction is complete, add terpene resin, dioctyl phthalate and antioxidant 1010 to reaction vessel 2, and continue stirring for 30 minutes to ensure that the components are fully mixed. Pressurized discharge: Open the discharge valve on the discharge pipe 3, and at the same time open the first valve 5 and close the second valve 7. When the stirring shaft 11 rotates, it drives the fixed gear 12 to rotate. Through the connecting frame 26 and the piston rod 25, it drives the piston plate in the air cylinder 9 to reciprocate. Outside air enters the air cylinder 9 through the air inlet pipe 24, and then enters the reaction tank 2 through the air outlet pipe 10 and the air delivery pipe 4, increasing the air pressure in the reaction tank 2 and pushing the material to be discharged quickly from the discharge pipe 3. The discharged material is collected to obtain the pressure-sensitive adhesive finished product.

[0038] Example 4: Combination Figure 1 - Figure 6 In this embodiment, the pressure-sensitive adhesive is produced using the production apparatus of Example 1. The pressure-sensitive adhesive comprises the following components by weight: 60 parts isooctyl acrylate, 20 parts butyl acrylate, 5 parts methyl methacrylate, 5 parts acrylic acid, 0.3 parts potassium persulfate, 15 parts C5 petroleum resin, 3 parts liquid paraffin, 0.2 parts antioxidant, and 100 parts deionized water. The production process is basically the same as that of Example 3, except that: the stirring shaft 11 rotates at 175 r / min, the stirring time is 20 min, the polymerization reaction temperature is 70℃, and the reaction time is 3.5 h.

[0039] Example 5: Combination Figure 1 - Figure 6 This embodiment uses the production apparatus of Example 1 to produce pressure-sensitive adhesive. The pressure-sensitive adhesive comprises the following components by weight: 80 parts isooctyl acrylate, 10 parts butyl acrylate, 10 parts methyl methacrylate, 2 parts acrylic acid, 0.8 parts ammonium persulfate-potassium persulfate mixed initiator (mass ratio 1:1), 25 parts rosin glyceryl ester, 8 parts dioctyl phthalate-liquid paraffin mixed softener (mass ratio 2:1), 0.5 parts antioxidant 1010-antioxidant 168 mixed antioxidant (mass ratio 1:1), and 150 parts deionized water. The production process is basically the same as that of Example 3, except that the polymerization reaction temperature is 80℃, the reaction time is 2.5h, the stirring shaft 11 speed is 200r / min, and the stirring time is 25min.

[0040] The above embodiments are merely preferred embodiments of the present invention and should not be construed as limiting the scope of protection of the present invention. Any non-substantial changes and substitutions made by those skilled in the art based on the present invention shall fall within the scope of protection claimed by the present invention.

Claims

1. A production apparatus for pressure-sensitive adhesive, characterized in that, include: The material holding mechanism includes a base (1) and a reaction vessel (2) mounted on top of the base (1); The stirring mechanism includes a stirring shaft (11) rotatably connected to and coaxially arranged with the inner wall of the top of the reaction vessel (2) and multiple sets of stirring components fixed to the outer periphery of the stirring shaft (11); A material turning mechanism is installed inside the reaction tank (2) and is used to turn the material at the bottom of the reaction tank (2) to the top when the stirring shaft (11) rotates. The material turning mechanism includes a gear ring (14) coaxially fixed to the inner ring of the reaction tank (2) and multiple sets of material turning components installed on the stirring shaft (11). The material turning components include a rotating shaft (22) rotatably connected to the outer circumference of the stirring shaft (11), a sleeve (23) movably sleeved on the outer circumference of the rotating shaft (22) and can rotate synchronously with it, and a spiral shaft (17) located directly below the sleeve (23) and connected to it for transmission. One end of the rotating shaft (22) is fixed with a linkage gear (16) meshing with the gear ring (14). The stirring shaft (11) is also equipped with a drive assembly for driving the sleeve (23) and the spiral shaft (17) to reciprocate along the length of the spiral shaft (17) while the rotating shaft (22) rotates.

2. The pressure-sensitive adhesive production apparatus according to claim 1, characterized in that, The drive assembly includes a toothed ring assembly (13) fixed in the inner ring of the reaction vessel (2) and multiple sets of drive components arranged on the outer periphery of the stirring shaft (11) and cooperating with the toothed ring assembly (13). The toothed ring assembly (13) includes multiple upper and lower toothed rings arranged alternately, and both the upper and lower toothed rings are coaxially arranged with the stirring shaft (11). Adjacent upper and lower toothed rings are staggered vertically, and the top view of multiple upper and lower toothed rings forms a complete ring. The toothed ring (14) is located below the toothed ring assembly (13), and multiple drive components are respectively arranged directly above multiple rotating shafts (22).

3. The pressure-sensitive adhesive production apparatus according to claim 2, characterized in that, The driving component includes a transmission screw (20) fixed to the outer periphery of the reaction vessel (2) in the radial direction, a moving block (21) threaded onto the outer periphery of the transmission screw (20), and a transmission gear (15) fixed to the end of the transmission screw (20) away from the stirring shaft (11). The transmission gear (15) cooperates with the upper and lower gear rings to rotate forward while following the revolution of the stirring rod (11) when it meshes with the upper gear ring, and rotates in reverse while following the revolution of the stirring rod (11) when it meshes with the lower gear ring. Two connecting plates (29) are fixed to the bottom of the moving block (21). Both connecting plates (29) are rotatably sleeved on the outer periphery of the sleeve (23). The spiral shaft (17) is rotatably connected to the two connecting plates (29).

4. The pressure-sensitive adhesive production apparatus according to claim 1, characterized in that, The reaction vessel (2) has a feed pipe (27) connected to its interior on one side of the top. A sealing cap (28) is threadedly connected to the inlet of the feed pipe (27). The reaction vessel (2) has a discharge pipe (3) installed on one side of the bottom. A valve is installed on the discharge pipe (3).

5. The pressure-sensitive adhesive production apparatus according to claim 1, characterized in that, The stirring component includes multiple stirring paddles (18) fixed along the radial direction of the reaction tank (2) on the outer periphery of the stirring shaft (11) and scrapers (19) fixed on the ends of the multiple stirring paddles (18) away from the stirring shaft (11). The multiple stirring paddles (18) are distributed sequentially from top to bottom, and the scrapers (19) are arranged along the axial direction of the reaction tank (2), and one long side of the scraper (19) abuts against the inner wall of the reaction tank (2).

6. The pressure-sensitive adhesive production apparatus according to claim 1, characterized in that, The top of the reaction vessel (2) is equipped with a power mechanism for driving the stirring shaft (11) to rotate. The power mechanism includes a mounting bracket installed on the top of the reaction vessel (2) and a stirring motor (8) installed on the mounting bracket. The top of the stirring shaft (11) extends above the reaction vessel (2) and is connected to the output shaft of the stirring motor (8) for transmission.

7. The pressure-sensitive adhesive production apparatus according to claim 1, characterized in that, The top of the reaction vessel (2) is equipped with a pressurizing mechanism for pressurizing the interior during discharge. The pressurizing mechanism includes two sets of air cylinders (9) installed on the top of the reaction vessel (2) and a transmission assembly installed on the top of the reaction vessel (2) for continuously conveying the gas in the two air cylinders (9) to the reaction vessel (2) when the stirring shaft (11) rotates. The two air cylinders (9) are arranged opposite each other and are located on both sides of the stirring shaft (11). A piston plate is installed in each of the two air cylinders (9). An air inlet pipe (24) and an air outlet pipe (10) are installed on the side of the two air cylinders (9) that are far apart from each other. Each of the two air inlets (24) is equipped with a one-way valve. The other end of each air inlet pipe (24) is connected to a gas delivery pipe (4) via a three-way pipe. The other end of the gas delivery pipe (4) extends into the reaction tank (2). A first valve (5) is installed on the gas delivery pipe (4) to control the input of air into the reaction tank (2). A pressure relief pipe (6) is also installed on the gas delivery pipe (4). The pressure relief pipe (6) is located at the end of the first valve (5) away from the end that is connected to the inner wall of the reaction tank (2). A second valve (7) is installed on the pressure relief pipe (6). The second valve (7) cooperates with the first valve (5) to control the exhaust path of the air in the gas delivery pipe (4).

8. The pressure-sensitive adhesive production apparatus according to claim 7, characterized in that, The transmission assembly includes a fixed gear (12) sleeved on the outer periphery of the stirring shaft (11) and a connecting frame (26) located on the outside of the fixed gear (12). Both short outer walls of the connecting frame (26) are fixed with piston rods (25). One end of each piston rod (25) extends into two air cylinders (9) and is fixed to the corresponding piston plate. The fixed gear (12) is an incomplete gear. Both long inner walls of the connecting frame (26) are provided with tooth grooves that cooperate with the fixed gear (12).

9. A method for producing pressure-sensitive adhesive, characterized in that, The production method employs the pressure-sensitive adhesive production apparatus as described in any one of claims 1-8, wherein the pressure-sensitive adhesive comprises the following components by weight: 60-80 parts of isooctyl acrylate, 10-20 parts of butyl acrylate, 5-10 parts of methyl methacrylate, 2-5 parts of acrylic acid, 0.3-0.8 parts of initiator, 15-25 parts of tackifying resin, 3-8 parts of softener, 0.2-0.5 parts of antioxidant, and 100-150 parts of deionized water; The production method Includes the following steps: Preparation: Weigh each raw material according to the above-mentioned weight proportions and set aside; Feeding: Open the sealing cap (28), add deionized water, isooctyl acrylate, butyl acrylate, methyl methacrylate and acrylic acid into the reaction vessel (2), and close the sealing cap (28). Stirring and mixing: Start the stirring motor (8) to drive the stirring shaft (11) to rotate at a speed of 150r / min-200r / min. The stirring paddle (18) performs radial stirring of the material in the reaction tank (2), and the scraper (19) scrapes off the material attached to the tank wall. At the same time, the stirring shaft (11) drives the material turning component to revolve. The linkage gear (16) meshes with the gear ring (14) to drive the rotating shaft (22) to rotate, which in turn drives the spiral shaft (17) to rotate, turning the bottom material to the upper layer. The transmission gear (15) meshes with the upper and lower gear rings of the gear ring assembly (13) alternately, driving the transmission screw (20) to rotate in both directions, causing the moving block (21) to move back and forth along the transmission screw (20), which in turn drives the spiral shaft (17) to move back and forth radially along the reaction tank (2). Stir for 15min-25min. Polymerization reaction: Slowly add the initiator into the reaction vessel (2), keep the speed of the stirring motor (8) constant, control the temperature inside the reaction vessel (2) to be 70℃-80℃, and react for 2.5h-3.5h; Modification and formulation: After the reaction is completed, add tackifying resin, softener and antioxidant to the reaction vessel (2) and continue stirring for 30 min-40 min to fully mix the components; Pressurized discharge: Open the discharge valve on the discharge pipe (3), and at the same time open the first valve (5) and close the second valve (7). When the stirring shaft (11) rotates, it drives the fixed gear (12) to rotate. Through the connecting frame (26) and the piston rod (25), it drives the piston plate in the air cylinder (9) to move back and forth. Outside air enters the air cylinder (9) through the air inlet pipe (24), and then enters the reaction tank (2) through the air outlet pipe (10) and the air delivery pipe (4), increasing the air pressure in the reaction tank (2) and pushing the material to be discharged quickly from the discharge pipe (3). The discharged material is collected to obtain the pressure-sensitive adhesive finished product.

10. The method for producing pressure-sensitive adhesive according to claim 9, characterized in that, The initiator is one or a mixture of two of ammonium persulfate and potassium persulfate; the tackifying resin is one or a mixture of one or a mixture of terpene resin, C5 petroleum resin, and rosin glyceryl ester; the softener is one or a mixture of two of dioctyl phthalate and liquid paraffin; and the antioxidant is one or a mixture of two of antioxidant 1010 and antioxidant 168.

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