Pressure-sensitive adhesive homogenizing and emulsifying device

Abstract

The invention relates to the technical field of chemical engineering devices, and particularly discloses a pressure-sensitive adhesive homogenizing and emulsifying device which comprises a kettle body and further comprises a feeding barrel arranged in the kettle body, meshes are formed in the side face and the bottom face of the feeding barrel, and a feeding gate is installed at the top of the feeding barrel; the feeding device is mounted in the kettle body and is used for opening the feeding gate to feed materials into the feeding barrel; the lifting device is mounted on the axis in the kettle body and is used for controlling the feeding barrel to lift; the water level ring is mounted in the kettle body and can sleeve the feeding barrel, and the water level in the kettle body is higher than the bottom end of the water level ring and lower than the top end of the water level ring; during mixing work, the lifting device controls the feeding barrel to ascend and descend in a reciprocating mode, the top face of the feeding barrel does not exceed the top face of the water level ring, liquid can be prevented from making contact with the feeding device to pollute a discharging port of the feeding device during use, and powder materials are prevented from escaping into air on the water surface.

Description

Technical Field

[0001] This invention relates to the field of chemical equipment technology, and specifically to a pressure-sensitive adhesive homogenizing emulsification device. Background Technology

[0002] In existing pressure-sensitive adhesive (PSA) preparation technologies, for applications requiring a balance of initial tack, holding tack, temperature resistance, and dimensional stability, inorganic or organic functional powders are typically introduced into the adhesive system as fillers or modifiers. These powders, such as silica, calcium carbonate, talc, or functional micropowders, are used to improve the PSA's rheological properties, shear resistance, and long-term stability. For water-based PSAs, the preparation process often involves emulsion polymerization or gelation followed by emulsification. However, in powder-containing PSA systems, the introduction of powder complicates the homogenization and emulsification process.

[0003] Chinese patent document CN117772373B discloses a stirring device for producing colloidal products, relating to the field of colloidal product production technology. The device includes: a vessel body with a lid; a stirring assembly mounted on the lid for stirring and mixing raw materials in the vessel body, the stirring assembly having a cleaning block for cleaning the raw materials; a driving assembly mounted in the vessel body for driving the cleaning block to slide on the stirring assembly; and a crushing assembly mounted on the cleaning block for crushing and breaking up lumps in the raw materials. Through the coordinated arrangement of the cleaning block and the driving assembly, colloidal raw materials and powder lumps adhering to the stirring blades can be scraped off, promoting thorough mixing of the raw materials, improving the production quality of the colloidal products, and ensuring that the stirring assembly has sufficient stirring intensity and shear force on the raw materials.

[0004] Chinese patent document CN220835354U discloses a colloid mixing device. It includes a base, a support column mounted on the upper surface of the base, a lifting column mounted at one end of the support column, a top plate mounted at the end of the lifting column away from the support column, a positioning column mounted on the lower surface of the top plate, a cover plate mounted on the lower surface of the positioning column, and a tank body disposed on the lower surface of the cover plate; and an adjustment structure located on the base, including a slide rail mounted on the upper surface of the base, and a servo motor mounted on the upper surface of the slide rail. This colloid mixing device allows operators to easily adjust the height and tilt of the tank body by activating an electric actuator and the servo motor, facilitating the placement of the colloid raw material into the tank. This improves the processing efficiency of the mixing device, exhibits high automation, and is worthy of widespread adoption.

[0005] In the production of pressure-sensitive adhesives, powdered materials need to be mixed with liquid materials to achieve a chemical reaction. However, in current production processes, most feeding methods employ open feeding ports or top gravity-feed designs. While this design is simple to operate, it presents certain problems in practical applications. Especially when the particle size of the powdered material is less than 50μm, its light weight makes it prone to generating a "dust effect" under the influence of gravity. Specifically, some powdered material does not directly enter the liquid-phase reaction zone but disperses into the gas phase space of the reactor as an aerosol. This not only reduces the contact area between the liquid and the powdered material, significantly decreasing the reaction rate and production quality, but also introduces additional production hazards. For example, the dispersed powdered material easily adheres to the side walls of the reactor, stirring devices, or other hard-to-clean areas, increasing the difficulty of subsequent equipment cleaning and potentially leading to material waste and environmental pollution. Therefore, existing feeding methods have room for improvement in terms of efficiency, quality, and maintenance. Summary of the Invention

[0006] This invention provides a pressure-sensitive adhesive homogenizing emulsification device, which aims to solve the problem in related technologies where some powder materials do not directly enter the liquid phase reaction zone, thus reducing the reaction rate and production quality of liquid and powder materials.

[0007] A pressure-sensitive adhesive homogenizing emulsification device includes a vessel body and further includes: The feeding hopper is installed inside the reactor. Mesh holes are provided on the sides and bottom of the feeding hopper, and a feeding gate is installed on the top of the feeding hopper. A feeding device, installed in the reactor body, is used to open the feed gate and feed material into the feeding bucket; A lifting device, installed on the axis inside the reactor, is used to control the lifting and lowering of the feeding bucket; A water level ring is installed inside the vessel and can be fitted onto the feeding bucket. The water level inside the vessel is higher than the bottom of the water level ring and lower than the top of the water level ring. During mixed operation, the lifting device controls the feeding bucket to move up and down repeatedly, and the top surface of the feeding bucket does not exceed the top surface of the water level ring. When the feeding bucket rises to its maximum height, the feeding device enters the feeding gate to feed the feeding bucket.

[0008] Its effect is as follows: The feeding device stores materials. When the lifting device controls the feeding bucket to rise to the feeding device position, the feeding device feeds materials into the feeding bucket. Then, the lifting device controls the feeding bucket to descend, so that the feeding bucket is completely immersed below the liquid surface. This allows the materials and liquid in the feeding bucket to mix with each other through the mesh. This process is repeated multiple times until all the materials in the feeding device are fully dissolved in the liquid. During this process, the materials in the feeding bucket are repeatedly lifted and immersed in the liquid, so that the feeding bucket and the liquid move relative to each other, thus achieving thorough mixing and accelerating the dissolution efficiency. Since the water level ring is located at a fixed height inside the vessel and can be fitted onto the feeding bucket, the water level inside the vessel is higher than the bottom end of the water level ring but lower than the top end. When the feeding bucket moves to its maximum height, the feeding device enters the feed gate to feed materials into the feeding bucket, avoiding contact between the liquid and the feeding device to contaminate the discharge port of the feeding device, and preventing powdered materials from escaping into the air above the water surface.

[0009] Preferably, the lifting device includes a reciprocating screw rotatably mounted on the axis of the vessel body, and a telescopic guide rod is installed between the feeding barrel and the vessel body to restrict the feeding barrel to only be raised and lowered. The nut on the reciprocating screw is fixedly connected to the feeding barrel. Since the degree of freedom of the nut to rotate is restricted, the rotation of the reciprocating screw causes the nut to rise and fall along the reciprocating screw, thereby raising and lowering the feeding barrel, and the material in the feeding barrel is repeatedly lifted out and immersed in the liquid.

[0010] Preferably, a dispersing rod is rotatably installed inside the feeding hopper, and multiple dispersing blades are evenly distributed on the dispersing rod. A drive structure is installed on the dispersing rod to drive the dispersing rod to rotate when the feeding hopper is raised or lowered. When the feeding hopper enters the liquid, the drive structure drives the dispersing rod to rotate, thereby causing the dispersing blades to stir the material, thus enabling the material to be quickly mixed with the liquid.

[0011] Preferably, the driving structure includes a driving hole that is opened at the axis of the dispersing rod and extends vertically. The reciprocating screw is provided with a guide groove that matches the driving hole, so that the dispersing rod can only move up and down relative to the reciprocating screw. When the reciprocating screw rotates, the feeding bucket rises and falls, and the dispersing rod rises and falls with the feeding bucket. Since the dispersing rod and the reciprocating screw are in sliding fit, the dispersing rod rotates together with the reciprocating screw, thereby stirring the material in the feeding bucket.

[0012] Preferably, the dispersing blade is elastically hinged to a vertical extrusion rod at one end near the inner wall of the feeding barrel. The inner wall of the feeding barrel is provided with a protrusion that can abut against the extrusion rod. The extrusion rod can contact the inner wall of the feeding barrel. While the feeding barrel is raised and lowered, the dispersing rod rotates with the reciprocating screw, thereby dispersing the material in the feeding barrel and dissolving it quickly in the liquid. Then, the large particles of material are crushed by the combined action of the extrusion rod and the inner wall of the feeding barrel.

[0013] Preferably, a stirring frame is rotatably installed inside the vessel, the top of the stirring frame is fixedly connected to a water level ring, and stirring blades are installed on the stirring frame for stirring the materials inside the vessel. The stirring blades are rotated by the rotation of the stirring frame, thereby mixing the liquid inside the vessel and further improving the uniformity of material mixing.

[0014] Preferably, multiple rotating blades are installed vertically between the bottom of the feeding bucket and the bottom of the vessel body, and the rotating blades are slidably connected up and down along the stirring frame. An adjustment mechanism is installed between the feeding bucket and the vessel body to make the rotating blades equally spaced. When the feeding bucket is feeding, the high-concentration liquid is stirred by the rotating blades at the bottom of the feeding bucket, thereby accelerating the mixing.

[0015] Preferably, the adjusting mechanism includes multiple elastic rods with the same elastic coefficient, which are respectively installed between every two adjacent rotating blades. When the feeding bucket descends to abut against the bearing, the elastic rods are compressed. Since all the elastic rods have the same elastic coefficient, the degree of deformation of the elastic rods is the same, thereby reducing the distance between the rotating blades synchronously. This allows the stirring range to be changed according to the height of the feeding bucket, so that the high-concentration liquid at the bottom of the feeding bucket can be fully mixed with the liquid in other parts.

[0016] Preferably, the feeding gate includes a sector-shaped gate. The top of the feeding hopper has a feeding port adapted to the sector-shaped gate. An elastic element is installed between the bottom of the sector-shaped gate and the feeding hopper to close the feeding port. In its natural state, the sector-shaped gate tightly fits the feeding port under the elastic force of the elastic element, sealing the feeding hopper and preventing backflow of liquid when the feeding hopper is immersed in liquid. When the feeding hopper rises to the position of the feeding device, the structure of the feeding device will squeeze the sector-shaped gate, overcoming the elastic force of the elastic element, causing the sector-shaped gate to rotate around the hinge point, thereby opening the feeding port and allowing material to enter the feeding hopper. When the feeding hopper descends and is freed from the squeezing of the feeding device, the sector-shaped gate automatically resets under the action of the elastic element, closing the feeding port again, ensuring that material does not leak from the feeding port during the descent of the feeding hopper and preventing liquid from entering the feeding hopper and interfering with subsequent feeding.

[0017] Preferably, the feeding device includes a storage pipe fixedly installed in the upper part of the vessel body. The shape of the storage pipe is adapted to the shape of the feed inlet of the feeding barrel. A discharge port is opened on the side of the storage pipe. A baffle plate that can abut against the top of the feeding barrel is slidably installed on the outside of the discharge port. An elastic element is installed between the baffle plate and the storage pipe. When the feeding barrel rises to a certain height, the bottom end of the baffle plate abuts against the top of the feeding barrel, and the storage pipe abuts against the fan-shaped gate, causing the fan-shaped gate to retract into the feeding barrel. The bottom end of the storage pipe passes through the docking hole and enters the feeding barrel. The material in the storage pipe is poured into the feeding barrel along the inclined surface, completing the feeding into the feeding barrel.

[0018] By adopting the above technical solution, the beneficial effects of the present invention are as follows: 1. During the feeding process, the top of the feeding bucket does not exceed the top of the water level ring, and the bottom of the water level ring is below the water surface. The storage pipe is connected to the feeding bucket. The material in the storage pipe is poured into the feeding bucket along the slope. Then the feeding bucket descends, and the elastic element releases its elastic potential energy to reset the fan-shaped gate. During this process, the mesh on the feeding bucket is not connected to the gas phase space of the reactor, thereby avoiding dust generation. 2. The feeding bucket is reciprocated by the lifting device, which repeatedly immerses and lifts it in the liquid. At the same time, the dispersing rod rotates with the reciprocating screw, which disperses the material in the feeding bucket and dissolves it quickly in the liquid. Then, the extrusion rod and the inner wall of the feeding bucket work together to crush large particles, so that the material in the feeding bucket can be dissolved quickly and fully. 3. When the mixing frame rotates, it drives all the rotating blades to rotate together, thereby causing the high-concentration liquid below the feeding bucket to spread rapidly. When the feeding bucket is raised and lowered, because there are elastic rods installed between the rotating blades and the top rotating blades can abut against the bottom of the feeding bucket, the mixing range of the rotating blades can be changed by raising and lowering the feeding bucket. Therefore, the mixing height can be changed according to the feeding height of the material. Attached Figure Description

[0019] Figure 1 This is a front view of the present invention.

[0020] Figure 2 This is a cross-sectional view of the present invention.

[0021] Figure 3 for Figure 2 A magnified structural diagram of point A in the middle.

[0022] Figure 4 This is a cross-sectional view of the feeding device in this invention during feeding.

[0023] Figure 5 This is a cross-sectional view of the feeding hopper in this invention.

[0024] Figure 6 This is a schematic diagram of the stirring rack in this invention.

[0025] Figure 7 This is a schematic diagram of the auxiliary stirring mechanism in this invention.

[0026] Figure label: 1. Kettle body; 2. Feeding device; 21. Feeding bucket; 211. Fan-shaped gate; 212. Elastic component one; 22. Telescopic guide rod; 23. Dispersing structure; 231. Dispersing rod; 232. Dispersing blade; 233. Extrusion rod; 3. Feeding device; 31. Storage pipe; 32. Baffle plate; 33. Elastic component two; 4. Lifting device; 41. Reciprocating screw; 5. Water level ring; 6. Stirring frame; 61. Connecting ring; 62. Stirring blade; 7. Secondary stirring mechanism; 71. Rotating blade; 72. Elastic rod. Detailed Implementation

[0027] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0028] like Figures 1-7 As shown, a pressure-sensitive adhesive homogenizing emulsification device includes a vessel body 1, a feeding device 2, a feeding device 3, a lifting device 4, a water level ring 5, and a stirring rack 6. A liquid injection pipe is connected to the side of the vessel body 1, and a discharge valve is installed at the bottom of the vessel body 1. The feeding device 2 is installed in the upper part of the vessel body 1, and the feeding device 3 is located above the feeding device 2. The lifting device 4 controls the reciprocating lifting and lowering movement of the feeding device 2, thereby causing the material in the feeding bucket 21 to be repeatedly lifted and immersed in the liquid, accelerating the dissolution efficiency. The water level ring 5 is located at a fixed height inside the vessel body 1 and can be fitted onto the feeding device 2. The water level inside the vessel body 1 is higher than the bottom of the water level ring 5 and lower than the top of the water level ring 5. When the feeding device 2 moves to its maximum height, the feeding device 3 enters the inlet gate to feed material into the feeding bucket 21, preventing the liquid from contacting and contaminating the outlet of the feeding device 3, and preventing powdered material from escaping into the air above the water surface.

[0029] The reactor body 1 is typically made of S31603 (316L) austenitic stainless steel to withstand the chemical corrosion that may occur from acrylic emulsions and various modifying agents. The outer wall of the reactor body 1 is equipped with a jacketed heat exchange layer, which is used to precisely control the reaction temperature by circulating heat transfer oil or cooling water during the polymerization or emulsification process. A large-diameter pneumatic discharge valve is integrated at the center of the bottom of the reactor body 1 to ensure that the high-viscosity adhesive can be smoothly discharged after the reaction is completed.

[0030] The feeding device 2 includes a feeding bucket 21, a telescopic guide rod 22, and a dispersing structure 23. The feeding bucket 21 is cylindrical in shape, and a through hole is provided along the axis of the feeding bucket 21. A connecting hole is provided on the top surface of the feeding bucket 21. The connecting hole is fan-shaped and a feed gate is installed inside the connecting hole. Mesh openings are provided on the side walls and bottom walls of the feeding bucket 21, allowing liquids or solutes to pass through the mesh and mix. The bottom end of the telescopic guide rod 22 is fixedly connected to the feeding bucket 21. The top of the feed tank 21 is coaxial with the top of the telescopic guide rod 22, which is fixedly connected to the reactor. The dispersing structure 23 is installed inside the feed tank 21 to disperse large particles in the feed tank 21. When the feed tank 21 is raised or lowered, the top surface of the feed tank 21 does not exceed the top surface of the water level ring 5, thereby preventing the powder from escaping into the air and causing the powder to adhere to the inner wall of the reactor 1, resulting in material waste. It also avoids affecting the material ratio in the subsequent reaction, which would reduce the reaction products.

[0031] The feed gate includes a sector-shaped gate 211 adapted to the docking hole. An elastic element 212 (preferably a spring rod) is installed at the bottom of the sector-shaped gate 211. The other end of the elastic element 212 is fixedly connected to the inner wall of the feeding bucket 21. In the initial state, the sector-shaped gate 211 is located in the docking hole, thereby sealing the docking hole and preventing the powder in the feeding bucket 21 from escaping into the air through the docking hole.

[0032] The telescopic guide rod 22 includes a sleeve and a hollow rod. The top end of the sleeve is fixedly connected to the vessel body 1. The hollow rod is slidably installed inside the sleeve, and a limiting structure (such as a chute slider mechanism) is provided between the two to limit the rotation of the hollow rod. The bottom end of the hollow rod is coaxially fixedly connected to the feeding bucket 21.

[0033] The dispersing structure 23 includes a dispersing rod 231, multiple dispersing blades 232, and multiple extrusion rods 233. The dispersing rod 231 is coaxially rotatably installed inside the feeding hopper 21. A drive hole that runs vertically through the axis of the dispersing rod 231 is provided. Multiple groups of dispersing blades 232 are fixedly installed on the dispersing rod 231. The extrusion rods 233 are vertically arranged and hinged to the end of the dispersing blades 232 away from the dispersing rod 231. An elastic piece is provided at the hinge, so that the extrusion rods 233 can fit tightly against the inner wall of the feeding hopper 21. The inner wall of the feeding hopper 21 is provided with protrusions that can abut against the extrusion rods 233. When the dispersing rod 231 rotates, large particles of material are crushed by the combined action of the extrusion rods 233, the inner wall of the feeding hopper 21, and the protrusions.

[0034] The feeding device 3 includes a storage pipe 31, a baffle plate 32, and an elastic element 33 (preferably a spring rod). The storage pipe 31 is fixedly installed inside the vessel body 1 and located above the feeding bucket 21. The top end of the storage pipe 31 extends out of the vessel body 1 and communicates with an external feeding device. The storage pipe 31 is fan-shaped, matching the shape of the inlet of the feeding bucket 21. An outlet is provided on the side of the storage pipe 31, and the bottom of the outlet is sloped to prevent material from accumulating at the bottom of the storage pipe 31. The baffle plate 32 is slidably installed on the outside of the outlet. The bottom end of component 2 can abut against the top of the feeding hopper 21. Elastic component 2 33 is installed between the baffle plate 32 and the storage pipe 31 to reset the baffle plate 32 and close the outlet again. When the feeding hopper 21 rises to a certain height, the bottom end of the baffle plate 32 abuts against the top of the feeding hopper 21, causing the baffle plate 32 to rise along with the feeding hopper 21. The storage pipe 31 abuts against the sector gate 211, causing the sector gate 211 to retract into the feeding hopper 21. The bottom end of the storage pipe 31 passes through the docking hole into the feeding hopper 21, and the outlet is connected to the feeding hopper 21 (e.g., ...). Figure 4 As shown), the material in the storage pipe 31 is poured into the feeding bucket 21 along the inclined surface. Then the feeding bucket 21 descends, and the elastic element 1 212 releases its elastic potential energy to reset the fan-shaped gate 211, thereby closing the docking hole and preventing the material in the feeding bucket 21 from escaping from the docking hole. At the same time, the elastic potential energy of the elastic element 2 33 causes the baffle plate 32 to descend relative to the storage pipe 31, thereby closing the discharge port of the baffle plate 32.

[0035] The lifting device 4 includes a motor and a reciprocating screw 41. The motor is fixedly installed on the top of the vessel body 1, and the reciprocating screw 41 is rotatably installed on the inner axis of the vessel body 1. The reciprocating screw 41 passes through the hollow rod, the through hole on the feeding barrel 21, and the drive hole of the dispersing rod 231 in sequence. A vertical guide bar is provided in the drive hole, and a guide groove (not shown in the figure) adapted to the guide bar is opened on the reciprocating screw 41, so that the dispersing rod 231 can only slide up and down relative to the reciprocating screw 41, so that the dispersing rod 231 can rotate with the reciprocating screw 41, thereby rotating the dispersing rod 231 relative to the feeding barrel 21, thereby dispersing the material in the feeding barrel 21, and then crushing the large particles of material through the combined action of the extrusion rod 233 and the inner wall of the feeding barrel 21. A nut is engaged with the reciprocating screw 41, and the nut is fixedly connected to the hollow rod. The output shaft of the motor is fixedly connected to the top of the reciprocating screw 41 through a coupling, thereby starting the motor to make the reciprocating screw 41 rotate, so that the nut moves back and forth along the reciprocating screw 41, which in turn makes the hollow rod move back and forth with the feeding bucket 21, so that the material in the feeding bucket 21 is repeatedly lifted out and immersed in the liquid, so that the material in the feeding bucket 21 is fully dissolved.

[0036] The stirring frame 6 consists of a connecting ring 61 and three sets of stirring blades 62. The connecting ring 61 is coaxially rotatably installed inside the vessel body 1. Each set of stirring blades 62 is connected together by a vertical rod. The bottom end of the vertical rod is fixedly connected to the reciprocating screw 41, and the top end of the vertical rod is fixedly connected to the connecting ring 61. The three sets of stirring blades 62 are arranged in a circular array around the axis of the connecting ring 61. The space between the vertical rods is formed for the feeding bucket 21 to rise and fall. When the reciprocating screw 41 rotates, the reciprocating screw 41 drives the vertical rod and the connecting ring 61 to rotate, thereby causing the stirring blades 62 to rotate and stir.

[0037] The water level ring 5 and the connecting ring 61 are coaxial and are fixedly connected together by spokes. The inner diameter of the water level ring 5 is slightly larger than the outer circumference radius of the feeding bucket 21, so that the feeding bucket 21 can enter the water level ring 5. The liquid level in the vessel 1 is initially higher than the bottom of the water level ring 5 and lower than the top of the water level ring 5, thereby avoiding the gap between the bottom of the water level ring 5 and the liquid surface, which would cause the material in the feeding bucket 21 to escape into the air through the gap.

[0038] The workflow steps are as follows: Step 1: A certain amount of material is conveyed into the storage pipe 31 through an external feeding device; Step 2: Inject liquid material into the vessel 1 through the injection pipe, so that the liquid level is between the top and bottom surfaces of the water level ring 5. Step 3: Start the motor to make the reciprocating screw 41 rotate, so that the feeding bucket 21 reciprocates and moves up and down along the reciprocating screw 41; Step 4: When the feeding hopper 21 rises to a certain height, the bottom end of the baffle plate 32 abuts against the top of the feeding hopper 21, causing the baffle plate 32 to rise along with the feeding hopper 21. The storage pipe 31 slides downward relative to the baffle plate 32, and the discharge port on the side of the storage pipe 31 gradually opens. At the same time, the storage pipe 31 abuts against the fan-shaped gate 211, causing the fan-shaped gate 211 to retract into the feeding hopper 21. The bottom end of the storage pipe 31 passes through the docking hole and enters the feeding hopper 21. The discharge port on the side of the storage pipe 31 is connected to the feeding hopper 21 (e.g., ...). Figure 4 As shown), the material in the storage pipe 31 is poured into the feeding bucket 21 along the inclined surface; Step 5: After the material is added to the feeding bucket 21, it descends. The storage pipe 31 moves upward relative to the feeding bucket 21. The elastic element 1 212 releases its elastic potential energy to reset the fan-shaped gate 211. At the same time, the elastic potential energy of the elastic element 2 33 causes the baffle plate 32 to descend relative to the storage pipe 31, thereby causing the baffle plate 32 to move downward relative to the storage pipe 31, thus closing the outlet. The feeding bucket 21 enters below the liquid surface, allowing the material in the feeding bucket 21 to mix and dissolve with the liquid. Step 6: While the reciprocating screw 41 rotates to control the lifting and lowering of the feeding bucket 21, the dispersing rod 231 slides up and down on the reciprocating screw 41. Therefore, the dispersing rod 231 rotates with the reciprocating screw 41, thereby dispersing the material in the feeding bucket 21 and quickly dissolving it in the liquid. Then, the large particles of material are crushed by the combined action of the extrusion rod 233 and the inner wall of the feeding bucket 21. Step 7: After the material in the storage pipe 31 has been completely discharged and fully dissolved in the liquid, and the reaction is complete, open the discharge valve to discharge the liquid after the reaction is complete.

[0039] Working principle: By repeatedly raising and lowering the feeding bucket 21, the feeding bucket 21 is repeatedly immersed in and lifted out of the liquid, so that the material in the feeding bucket 21 can be quickly and fully dissolved, and the material can be prevented from escaping into the air and from adhering to the inner wall of the vessel 1, thus avoiding waste. In this process, the material is quantitatively and periodically added to the feeding bucket 21 through the storage pipe 31, thereby avoiding the material being poured into the liquid all at once and reacting violently, which would lead to an uncontrollable reaction rate.

[0040] Because the concentration of materials in the solution below the feeding tank 21 is relatively high, a secondary stirring mechanism 7 is provided at the bottom of the feeding tank 21.

[0041] The auxiliary stirring mechanism 7 includes multiple rotating blades 71 and multiple elastic rods 72 (preferably spring rods). Each rotating blade 71 consists of three horizontal rods arranged in a circular array around the axis of the vessel body 1, with their ends connected by a collar. A reciprocating screw 41 passes through the collar but does not contact it. A slide rail is provided along the length of the inner side of the vertical rod, and the three ends of the rotating blades 71 are slidably connected to the three slide rails (e.g., ...). Figure 7 As shown), the rotating blades 71 can rotate together with the stirring frame 6. Elastic rods 72 are installed between the rotating blades 71. All elastic rods 72 have the same elastic coefficient. The collar of the rotating blade 71 at the top is equipped with a bearing that contacts the feeding bucket 21, thereby reducing the frictional force on the rotating blades 71 when rotating relative to the feeding bucket 21. When the feeding bucket 21 descends to abut against the bearing, the elastic rods 72 are compressed. Since all elastic rods 72 have the same elastic coefficient, the degree of deformation of the elastic rods 72 is the same, thereby reducing the distance between the rotating blades 71 synchronously. This allows the stirring range to be changed according to the height of the feeding bucket 21, so that the high-concentration liquid at the bottom of the feeding bucket 21 can be fully mixed with the liquid in other parts. In high-concentration liquids, the resistance at the bottom is the greatest. The auxiliary stirring mechanism 7 is not a rigid structure, and the elastic rods 72 set between the rotating blades 71 can adapt to change.

[0042] Operating condition response: When the feeding tank 21 descends to press against the high viscosity liquid, or when the resistance of the bottom sediment is too great, the bearing contacts the feeding tank 21 to apply pressure, compressing the elastic rod 72. At this time, the rotating blade 71 will contract inward, reducing the stirring diameter. The reduction in diameter means the reduction in lever arm, which significantly reduces the torque required for stirring. When the resistance decreases, the elastic rod 72 returns to its original position, and the stirring range expands again. This design is precisely to ensure that the device can operate stably in a high viscosity environment.

[0043] The production process of pressure-sensitive adhesive is as follows: The formulation system includes 50 parts of deionized water as a dispersion medium, 1.5 parts of a composite emulsifier composed of anionic sodium dodecyl sulfate and nonionic octylphenol polyoxyethylene ether in a 1:2 mass ratio, 45 parts of butyl acrylate as a soft monomer, 5 parts of methyl methacrylate as a hard monomer, 2 parts of acrylic acid as a functional monomer, 2.5 parts of fumed silica powder with a particle size of 20 to 40 nanometers that has been surface modified with a silane coupling agent, and 0.4 parts of ammonium persulfate as an initiator.

[0044] First, pre-inject the total amount of deionized water, all of the composite emulsifier, and 30% of the total monomer into the reactor body 1. Strictly control the initial liquid level to be within the effective working range of the liquid seal ring inside the reactor, that is, the liquid surface must completely submerge the bottom of the liquid seal structure to build a gas-liquid isolation barrier. Then, start stirring under a constant temperature of 25±2℃, set the speed to 80 to 100 rpm, and carry out a pre-emulsification treatment for 15 minutes until the system forms a stable pre-emulsion with blue fluorescence.

[0045] The process then proceeds to the dust-free addition and wet pulverization stage of the powder filler. Under normal or slightly positive pressure conditions inside the reactor, 2.5 parts of nano-silica powder are introduced into the liquid phase. The single addition cycle is controlled within 3 to 5 minutes. At the same time, the high-frequency wet pulverization program is started, using the submerged reciprocating hydraulic shearing action to homogenize the powder-liquid mixture. The reciprocating shearing frequency is set to 10 to 15 times / minute, and the process is continued for 20 minutes to ensure that the dispersed particle size of the powder in the pre-emulsion is less than 5 micrometers and there are no visible agglomerates, thus achieving complete wetting and encapsulation of the powder in the liquid phase.

[0046] After the homogeneous substrate is prepared, hot water is introduced into the jacket of reactor body 1, and the temperature inside the reactor is raised to the polymerization reaction range of 78 to 82°C at a heating rate of 1.5°C / min. When the temperature stabilizes at 75°C, the remaining 70% of the mixed monomer emulsion and the initiator aqueous solution are continuously added dropwise. The dropwise addition time of the monomer mixture is strictly controlled to be 3 to 3.5 hours, and the dropwise addition time of the initiator is controlled to be 3.5 to 4 hours. The dropwise addition of the initiator ends slightly later than that of the monomer to ensure the full conversion of the remaining monomer. During the dropwise addition process, the reaction temperature fluctuation inside the reactor is controlled within ±1°C by dynamically adjusting the flow rate of the jacket cooling water.

[0047] As the polymerization reaction progresses, the solid content of the system gradually approaches 52%, and the viscosity of the adhesive solution rises sharply from below 500 mPa·s to a high viscosity state of 15,000 to 25,000 mPa·s. At this point, the process automatically switches to a high viscosity homogenization strategy, increasing the main stirring speed to 120 to 150 rpm to ensure sufficient shearing of the high-viscosity fluid in the central region. At the same time, longitudinal reciprocating flow field disturbances are maintained at a frequency of 5 to 8 times / minute to eliminate heat transfer dead zones and local overheating under high viscosity. After the droplet addition is completed, the system is heated to 82 to 85°C and kept at this temperature for 1 hour for curing.

[0048] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A pressure sensitive adhesive homogenizing and emulsifying device comprising a kettle body (1), characterized in that, Also include: The feeding bucket (21) is arranged in the kettle body (1), the feeding bucket (21) is provided with mesh on the side and bottom, and the feeding bucket (21) is provided with feeding gate on the top; The feeding device (3) is installed in the kettle body (1) for opening the feeding gate to feed the feeding bucket (21); The lifting device (4) is installed on the axis in the kettle body (1) for controlling the feeding bucket (21) to lift; The water level ring (5) is installed in the kettle body (1) and can be sleeved on the feeding bucket (21), the water level in the kettle body (1) is higher than the bottom of the water level ring (5), and lower than the top of the water level ring (5); During mixing work, the lifting device (4) controls the feeding bucket (21) to reciprocatingly lift, and the top surface of the feeding bucket (21) does not exceed the top surface of the water level ring (5), when the feeding bucket (21) is lifted to the maximum height, the feeding device (3) enters the feeding gate to feed the feeding bucket (21).

2. The pressure sensitive adhesive homogenizing and emulsifying device according to claim 1, wherein The lifting device (4) comprises a reciprocating screw rod (41) rotatably installed on the axis in the kettle body (1), a telescopic guide rod (22) is installed between the feeding bucket (21) and the kettle body (1) for limiting the feeding bucket (21) to only lift, and the nut on the reciprocating screw rod (41) is fixedly connected with the feeding bucket (21).

3. The pressure sensitive adhesive homogenizing and emulsifying device according to claim 2, wherein The feeding bucket (21) is rotatably installed with a scattering rod (231), a plurality of scattering leaves (232) are uniformly distributed on the scattering rod (231), and a driving structure for driving the scattering rod (231) to rotate when the feeding bucket (21) lifts is installed on the scattering rod (231).

4. The pressure sensitive adhesive homogenizing and emulsifying device according to claim 3, wherein The driving structure comprises a driving hole opened on the axis of the scattering rod (231) and penetrating up and down, and a guide groove adapted to the driving hole is opened on the reciprocating screw rod (41), so that the scattering rod (231) can only move up and down relative to the reciprocating screw rod (41).

5. The pressure sensitive adhesive homogenizing and emulsifying device according to claim 3, wherein The end of the scattering leaf (232) close to the inner wall of the feeding bucket (21) is elastically hinged with a vertical extrusion rod (233), a protruding strip capable of abutting against the extrusion rod (233) is arranged on the inner wall of the feeding bucket (21), and the extrusion rod (233) can be in contact with the inner wall of the feeding bucket (21).

6. The pressure sensitive adhesive homogenizing and emulsifying device according to claim 2, wherein The kettle body (1) is rotatably installed with a stirring frame (6), the top end of the stirring frame (6) is fixedly connected with the water level ring (5), and the stirring frame (6) is installed with stirring leaves (62) for stirring the materials in the kettle body (1).

7. The pressure sensitive adhesive homogenizing and emulsifying device according to claim 6, characterized in that A plurality of rotating leaves (71) are installed between the bottom of the feeding bucket (21) and the bottom of the kettle body (1) in the vertical direction, and the rotating leaves (71) are slidably connected along the stirring frame (6), and an adjusting mechanism for equally spacing the rotating leaves (71) is installed between the feeding bucket (21) and the kettle body (1).

8. The pressure sensitive adhesive homogenizing and emulsifying device according to claim 7, wherein The adjusting mechanism comprises a plurality of elastic rods (72) with the same elastic coefficient, which are respectively installed between every two adjacent rotating leaves (71).

9. The pressure sensitive adhesive homogenizing and emulsifying device according to any one of claims 1 to 8, characterized in that The feeding gate comprises a sector gate plate (211), the top end of the feeding bucket (21) is provided with a feeding port adapted to the sector gate plate (211), and the bottom of the sector gate plate (211) and the feeding bucket (21) are provided with an elastic member one (212) for closing the feeding port of the sector gate plate (211).

10. The pressure sensitive adhesive homogenizing and emulsifying device according to claim 9, wherein The feeding device (3) comprises a storage tube (31) fixedly installed at the upper part of the kettle body (1), the shape of the storage tube (31) is matched with the shape of the feeding inlet of the feeding barrel (21), a discharge opening is formed in the side of the storage tube (31), a baffle plate (32) capable of abutting against the top of the feeding barrel (21) is slidably installed on the outside of the discharge opening in an up-down direction, and an elastic element two (33) is installed between the baffle plate (32) and the storage tube (31).

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