Adhesive stirring device and stirring process

Abstract

The invention discloses an adhesive stirring device and a stirring process, and belongs to the technical field of adhesive stirring, the adhesive stirring device comprises a sealing tank and a driving mechanism arranged above the sealing tank, a loop bar is arranged below the driving mechanism through a stirring shaft, a stirring mechanism connected with the loop bar is further arranged in the sealing tank, and the stirring mechanism is connected with the loop bar through a stirring shaft. The stirring mechanism comprises a connecting rod slidably arranged on the side face of the sleeve rod, and a stirring blade assembly is arranged on the side, away from the sleeve rod, of the connecting rod. Two connecting rods which are symmetrically distributed up and down are arranged on the same side of the sleeve rod, the two connecting rods can synchronously move on the side face of the sleeve rod, and when the two connecting rods get close to each other, the stirring blade assembly can be driven to get close to the inner wall of the sealing tank, and the stirring radius is increased; the stirring blade assembly is driven to approach to the stirring shaft when the two are far away from each other, so that the stirring radius is reduced, the driving mechanism starting torque is reduced and the motor load is reduced. When the radius is increased, the shearing force of the stirring blades is increased, and the stirring effect is improved.

Description

Technical Field

[0001] This invention relates to the field of adhesive mixing technology, specifically an adhesive mixing device and mixing process. Background Technology

[0002] Pressure-sensitive adhesives are adhesives that adhere under slight pressure and bond quickly without water, solvents, or heating. During the manufacturing process, the mixing process is one of the key steps affecting the final performance of the pressure-sensitive adhesive. Improper mixing can lead to uneven mixing of components, residual air bubbles, decreased performance, or even failure.

[0003] A published patent (publication number: CN113842819B) discloses an adhesive mixing device that improves mixing efficiency by changing the single rotary stirring during adhesive mixing to a combined stirring method that combines rotary stirring with up-and-down reciprocating stirring.

[0004] In the process of mixing adhesives, the most important thing is how to mix the solution evenly. The above-mentioned patent uses up-and-down reciprocating motion, which increases energy consumption and destroys the vortex formed by mixing, making it impossible for the upper and lower convection to form, thus causing problems in the exchange of the upper and lower mixed solutions. Summary of the Invention

[0005] The purpose of this invention is to provide an adhesive mixing device and mixing process to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] An adhesive mixing device includes a sealed container and a drive mechanism disposed above the sealed container. A sleeve rod is disposed below the drive mechanism via a stirring shaft. The sealed container is also provided with a stirring mechanism connected to the sleeve rod. The stirring mechanism includes a connecting rod slidably disposed on the side of the sleeve rod. A stirring blade assembly is disposed on the side of the connecting rod away from the sleeve rod. Under the centrifugal force generated when the sleeve rod rotates, the connecting rods will move closer to each other and drive the stirring blade assembly to move closer to the inner wall of the sealed container.

[0008] As a further embodiment of the present invention: a sliding block is provided between the connecting rod and the sleeve rod, two connecting rods are provided on the same side of the sleeve rod and are symmetrically distributed vertically, and a return spring is provided between the sliding block and the sleeve rod.

[0009] As a further embodiment of the present invention: wherein the stirring blade assembly includes a fixing frame hinged to the connecting rod, the fixing frame having a fixing sleeve fixedly installed on the end face near the inner wall of the sealed tank, the upper and lower ends of the fixing sleeve being respectively fitted with fixing rods, and the fixing rods having evenly distributed fixing seats fixedly installed on the fixing seats.

[0010] As a further embodiment of the present invention, a stirring blade is rotatably connected to the fixed base.

[0011] As a further embodiment of the present invention: both the fixing frame and the fixing sleeve have a movable groove inside, and a trapezoidal block is slidably connected inside the movable groove.

[0012] As a further embodiment of the present invention: a movable rod is slidably connected inside the fixed rod, and movable toothed plates are welded to both ends of the movable rod. A rotating shaft that is fixedly connected to the stirring blade is rotatably connected inside the fixed seat. The rotating shaft extends into the interior of the fixed rod and is fixedly connected to the adjusting gear. The adjusting gear meshes with the movable toothed plate.

[0013] As a further embodiment of the present invention: the lower end of the movable rod is connected to the inclined surface of the trapezoidal block via a connecting rod, and a movable rod is hinged to the opposite surfaces of the two connecting rods, and the movable rod is fixedly connected to the trapezoidal block via a push-pull rod.

[0014] As a further embodiment of the present invention: wherein the trapezoidal block is an isosceles trapezoid with the same inclination angle on the upper and lower inclined surfaces, and the connecting rod is L-shaped.

[0015] As a further embodiment of the present invention: guide rods are respectively provided on both sides of the trapezoidal block, the guide rods slide inside the moving groove, and the trapezoidal block moves along the center line of the moving groove.

[0016] An environmentally friendly biodegradable adhesive mixing process, characterized by comprising the following steps:

[0017] S101. Pour the materials required for the production of pressure-sensitive adhesive into the sealed tank through the feed port, start the drive mechanism 20 to stir, and add the matrix polymer and solvent.

[0018] S102. Entering the "start-up stage" involves a slow speed and a small stirring radius. At the same time, thickening resin is added to ensure complete dissolution.

[0019] S103, the "start-up phase" ends and the "acceleration phase" begins. With the presence of acceleration, centrifugal force is generated. In the presence of the stirring blade assembly, the connecting rods move closer to each other, and the stirring blade assembly moves towards the inner wall of the sealed tank. At this time, the radius is large and the shear force is also large. It is necessary to control the running time and add sensitive ingredients.

[0020] S104. Complete the mixing of the pressure-sensitive adhesive.

[0021] Compared with the prior art, the beneficial effects of the present invention are:

[0022] 1. In this embodiment, the adhesive mixing device has two symmetrically distributed connecting rods on the same side of the sleeve rod. The two connecting rods can move synchronously on the side of the sleeve rod. When they move closer to each other, they drive the mixing blade assembly towards the inner wall of the sealed tank, increasing the mixing radius. When they move away from each other, they drive the mixing blade assembly towards the mixing shaft, reducing the mixing radius, lowering the starting torque of the drive mechanism, and reducing the motor load. The increased radius also increases the shear force of the mixing blades, improving the mixing effect.

[0023] 2. In this embodiment of the adhesive mixing device, when the mixing speed changes, the connecting rods move closer to each other under the action of centrifugal force. By squeezing the movable rod between the connecting rods, the push-pull rod hinged to the movable rod can push the trapezoidal block to move outward (i.e., move towards the inner wall of the tank). As the trapezoidal block moves inside the moving groove, the change in the height of the inclined plane will drive the connecting rod to move up and down on both sides inside the moving groove, thereby driving the moving rod to move. In this way, the moving toothed plate can be controlled to engage with and drive the adjusting gear to rotate. This achieves the effect of changing the angle of the mixing blades when the mixing radius and mixing speed change, thus improving the mixing efficiency.

[0024] 3. In this embodiment, the adhesive mixing process involves adding different raw materials at different stages, which improves the mixing efficiency of the pressure-sensitive adhesive during the mixing process. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the overall structure of the sealed container in this invention;

[0026] Figure 2 This is a schematic diagram of the stirring mechanism in this invention;

[0027] Figure 3 This is a schematic diagram of the connection between the sleeve rod and the connecting rod in this invention;

[0028] Figure 4 This is a schematic diagram of the stirring blade assembly in this invention;

[0029] Figure 5 This is a cross-sectional schematic diagram of the stirring mechanism in this invention;

[0030] Figure 6 For the present invention Figure 5 Enlarged view of point A in the middle;

[0031] Figure 7 This is a schematic diagram showing the connection between the stirring blade assembly and the connecting rod in this invention;

[0032] Figure 8 For the present invention Figure 7 Schematic diagram of structure B in the middle.

[0033] The correspondence between the labels and component names in the attached figures is as follows:

[0034] 10. Sealed tank; 20. Drive mechanism; 21. Stirring shaft; 22. Sleeve rod; 30. Stirring mechanism; 31. Connecting rod; 311. Movable rod; 312. Push-pull rod; 32. Sliding block; 33. Stirring blade assembly; 331. Fixed frame; 332. Fixed sleeve; 333. Fixed rod; 3331. Moving rod; 3332. Moving toothed plate; 3333. Rotating shaft; 3334. Adjusting gear; 3335. Connecting rod; 334. Fixed seat; 335. Stirring blade; 336. Moving groove; 337. Trapezoidal block. Detailed Implementation

[0035] Please see Figure 1 The diagram shows the overall structure of the device in this embodiment. The device includes a sealed tank 10, and a drive mechanism 20 is provided above the sealed tank 10. The output shaft of the drive mechanism 20 extends into the interior of the sealed tank 10 and is connected to the stirring shaft 21. The sealed tank 10 includes a cover plate and a barrel body. The cover plate is fitted onto the barrel body in an interlocking manner, and an inlet is provided on the cover plate for feeding the mixture for producing pressure-sensitive adhesive into the interior of the sealed tank 10. After the mixing is completed, the mixed solution can be discharged through the outlet (not shown in the figure) provided at the bottom.

[0036] like Figure 2 As shown, a sleeve rod 22 is connected to the stirring shaft 21 via a pin. Symmetrically distributed stirring mechanisms 30 are arranged on both sides of the sleeve rod 22. Each stirring mechanism 30 includes a connecting rod 31 slidably disposed on the side of the sleeve rod 22. The connecting rod 31 is connected to the sleeve rod 22 via a sliding block 32 and moves within a guide groove 23 provided on the sleeve rod 22. The connecting rod 31 and the sliding block 32 are hinged. The stirring mechanism 30 also includes a stirring blade assembly 33 connected to the connecting rod 31. As the connecting rod 31 moves inward through the sliding block 32 within the guide groove 23, the radial distance of the connecting rod 31 inside the sealed container 10 increases, thus increasing the stirring radius of the stirring mechanism 30 within the sealed container 10. This increase in stirring radius expands the shear zone during stirring and reduces the "dead zone" at the container edge, thereby improving stirring efficiency.

[0037] Two connecting rods 31 are symmetrically distributed on the same side of the sleeve rod 22. The two connecting rods 31 can move synchronously on the side of the sleeve rod 22. When they are close to each other, they will drive the stirring blade assembly 33 to move closer to the inner wall of the sealed tank 10, increasing the stirring radius. When they are far apart, they will drive the stirring blade assembly 33 to move closer to the stirring shaft 21, reducing the stirring radius. Because the stirring blade assembly 33 has its own gravity, the rotation speed is slow in the "start-up phase" when the stirring shaft 21 just begins to rotate. At this time, the two connecting rods 31 will not move inward. Therefore, in the "start-up phase", the stirring radius of the stirring shaft 21 is the initial radius. The initial radius is small. The smaller the radius, the smaller the shearing area. At this time, the work done to overcome the resistance will be smaller. Compared with a stirring device with a constant radius, when the motor just starts to rotate, the shearing area is larger, so the resistance to overcome will increase, and the work done by the motor to overcome the resistance will increase. When the stirring shaft 21 is in the "acceleration phase", there is acceleration. Therefore, under the action of centrifugal force, the stirring blade assembly 33 will move towards the inner wall of the sealed tank 10. At this time, the connecting rods 31 will move closer to each other. In this process, after the motor passes through the "start-up phase", the stirring radius of the stirring shaft 21 also changes, increasing the shearing area and avoiding the generation of stirring "dead zone". After the speed is constant, it enters the third stage, which can also be called the "uniform speed stage". The stirring shaft 21 can maintain the maximum stirring radius for stirring, improving stirring efficiency.

[0038] A return spring is provided between the sliding block 32 and the sleeve rod 22. When the stirring shaft 21 stops rotating, the speed gradually decreases, the stirring blade assembly 33 approaches the stirring shaft 21, the stirring radius decreases, and it returns to the initial radius state to prepare for the next stirring.

[0039] like Figure 3 and Figure 4 As shown, a drive assembly is provided between the two connecting rods 31 on the same side of the sleeve rod 22. The drive assembly is connected to the stirring blade assembly 33. The stirring blade assembly 33 includes a fixing frame 331 hinged to the connecting rod 31. A fixing sleeve 332 is fixedly installed on the end face of the fixing frame 331 near the inner wall of the sealed tank 10. Fixing rods 333 are respectively sleeved on the upper and lower ends of the fixing sleeve 332. Evenly distributed fixing seats 334 are fixedly installed on the fixing rods 333. Stirring blades 335 are rotatably connected to the fixing seats 334. During the stirring process, due to the stirring blades 335, the fluid inside the sealed tank 10 is thrown towards the tank wall by centrifugal force, and a low-pressure zone is formed in the central area, causing the liquid surface to sink and forming a vortex. As the stirring shaft 21 changes from the "starting stage" to the "acceleration stage", the stirring radius will gradually increase. At this time, the liquid surface depression (vortex) deepens, enhancing the entrainment of material at the inner edge of the sealed tank 10 and enhancing the stirring effect.

[0040] Simultaneously, the shear angle of the stirring blades 335 is changed by rotating on the fixed base 334. During the "initial stage," the shear angle is small, resulting in low blade resistance and reducing the work done by the drive mechanism 20 to overcome resistance during startup. As the stirring radius increases, the angle of the stirring blades 335 also increases, thereby increasing the shear force of the blades. This generates strong centrifugal force, forming a high-shear zone, allowing the material in the flow field to move axially, thus enhancing the stirring effect.

[0041] Specifically, such as Figure 5 and Figure 6 As shown, both the fixed frame 331 and the fixed sleeve 332 have a movable groove 336 inside. A trapezoidal block 337 is slidably connected inside the movable groove 336. A movable rod 3331 is slidably connected inside the fixed rod 333. Movable toothed plates 3332 are welded to both ends of the movable rod 3331. A rotating shaft 3333, which is fixedly connected to the stirring blade 335, is rotatably connected inside the fixed seat 334. The rotating shaft 3333 extends into the fixed rod 333 and is fixedly connected to the adjusting gear 3334. The adjusting gear 3334 meshes with the movable toothed plate 3332. In this embodiment, the movable rod 3331 moves inside the fixed rod 333, thereby driving the movable toothed plate 3332 to move. The meshing connection drives the adjusting gear 3334 to rotate, thereby controlling the rotation of the stirring blade 335 on the fixed seat 334.

[0042] like Figure 7 and Figure 8 As shown, in order to allow the stirring blade 335 to change its angle as the stirring speed and stirring radius change during the stirring process, the lower end of the moving rod 3331 is connected to the inclined surface of the trapezoidal block 337 through the connecting rod 3335. The two connecting rods 31 are hinged to the opposite surfaces of the moving rods 31, and the moving rod 311 is fixedly connected to the trapezoidal block 337 through the push-pull rod 312. In this embodiment, when the stirring speed changes, the connecting rods 31 approach each other under the action of centrifugal force. By squeezing the movable rod 311 between the connecting rods 31, the push-pull rod 312, which is hinged to the movable rod 311, can push the trapezoidal block 337 to move outward (i.e., move towards the inner wall of the tank). The trapezoidal block 337 moves inside the moving groove 336. Due to the change in the height of the inclined plane, the connecting rod 3335 moves up and down inside the moving groove 336, thereby driving the moving rod 3331 to move. In this way, the moving toothed plate 3332 can be controlled to mesh and drive the adjusting gear 3334 to rotate. This achieves the effect of changing the angle of the stirring blade 335 when the stirring radius and stirring speed change, thus improving the stirring efficiency.

[0043] It should be noted that guide rods are provided on both sides of the trapezoidal block 337. The guide rods slide inside the moving groove 336, and the trapezoidal block 337 moves along the center line of the moving groove 336. The trapezoidal block 337 is an isosceles trapezoid with the same inclination angle on the upper and lower inclined surfaces, ensuring that the upper and lower connecting rods 3335 can move synchronously. The connecting rod 3335 is L-shaped, which can meet the internal structure of the moving groove 336.

[0044] The specific process flow is as follows:

[0045] S101. Pour the materials required for the production of pressure-sensitive adhesive into the sealed tank 10 through the feed port, start the drive mechanism 20 to stir, and stir in two stages: "start-up stage" and "acceleration stage"; and add the base polymer (such as acrylic emulsion, rubber) and solvent.

[0046] S102. During the "start-up phase," the speed is slow, the stirring radius is small, and the stirring blade angle is also small. At this time, the shear force is low, reducing the starting torque of the drive mechanism by 20° and decreasing the motor load. Simultaneously, thickening resin (such as rosin or petroleum resin) is added to ensure complete dissolution.

[0047] S103, the "start-up phase" ends and the "acceleration phase" begins. With the presence of acceleration, centrifugal force is generated. In the presence of the stirring blade assembly 33, the connecting rods move closer to each other, and the stirring blade assembly 33 moves towards the inner wall of the sealed tank 10. At this time, the radius is large and the shear force is also large. It is necessary to control the running time and add sensitive ingredients (such as crosslinking agents and antioxidants) to avoid premature reaction.

[0048] S104. Complete the production of pressure-sensitive adhesive.

[0049] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. An adhesive mixing device, comprising a sealed container (10) and a drive mechanism (20) disposed above the sealed container (10), characterized in that, Below the drive mechanism (20), a sleeve rod (22) is provided via a stirring shaft (21). Inside the sealed tank (10), a stirring mechanism (30) connected to the sleeve rod (22) is also provided. The stirring mechanism (30) includes a connecting rod (31) slidably disposed on the side of the sleeve rod (22). A stirring blade assembly (33) is provided on the side of the connecting rod (31) away from the sleeve rod (22). Under the centrifugal force generated when the sleeve rod (22) rotates, the connecting rods (31) will move closer to each other and drive the stirring blade assembly (33) to move closer to the inner wall of the sealed tank (10) or away from each other.

2. The adhesive mixing device according to claim 1, characterized in that, A sliding block (32) is provided between the connecting rod (31) and the sleeve rod (22). Two connecting rods (31) are symmetrically distributed on the same side of the sleeve rod (22). A return spring is provided between the sliding block (32) and the sleeve rod (22).

3. The adhesive mixing device according to claim 2, characterized in that, The stirring blade assembly (33) includes a fixing frame (331) hinged to the connecting rod (31). A fixing sleeve (332) is fixedly installed on the end face of the fixing frame (331) near the inner wall of the sealed tank (10). Fixing rods (333) are respectively sleeved on the upper and lower ends of the fixing sleeve (332). Evenly distributed fixing seats (334) are fixedly installed on the fixing rods (333).

4. The adhesive mixing device according to claim 3, characterized in that, A stirring blade (335) is rotatably connected to the fixed base (334).

5. The adhesive mixing device according to claim 4, characterized in that, The fixed frame (331) and the fixed sleeve (332) are both provided with a moving groove (336), and a trapezoidal block (337) is slidably connected inside the moving groove (336).

6. The adhesive mixing device according to claim 4, characterized in that, The fixed rod (333) is slidably connected to a movable rod (3331), and movable toothed plates (3332) are welded to both ends of the movable rod (3331). The fixed seat (334) is rotatably connected to a rotating shaft (3333) that is fixedly connected to the stirring blade (335). The rotating shaft (3333) extends into the interior of the fixed rod (333) and is fixedly connected to the adjusting gear (3334). The adjusting gear (3334) meshes with the movable toothed plate (3332).

7. The adhesive mixing device according to claim 6, characterized in that, The lower end of the movable rod (3331) is connected to the inclined surface of the trapezoidal block (337) through the connecting rod (3335). The movable rod (311) is hinged to the opposite surface of the two connecting rods (31). The movable rod (311) is fixedly connected to the trapezoidal block (337) through the push-pull rod (312).

8. The adhesive mixing device according to claim 7, characterized in that, The trapezoidal block (337) is an isosceles trapezoid with the same inclination angle on the upper and lower slopes, and the connecting rod (3335) is L-shaped.

9. The adhesive mixing device according to claim 5, characterized in that, Guide rods are provided on both sides of the trapezoidal block (337), the guide rods slide inside the moving groove (336), and the trapezoidal block (337) moves along the center line of the moving groove (336).

10. An adhesive mixing process, characterized in that, Includes the following steps: S101. Pour the materials required for the production of pressure-sensitive adhesive into the sealed tank (10) through the feed port, start the drive mechanism (20) to stir, and add the matrix polymer and solvent. S102. When entering the "start-up stage", the speed is slow and the stirring radius is small. At the same time, thickening resin is added to ensure complete dissolution. S103, "Start-up phase" ends, enters "acceleration phase". With the existence of acceleration, centrifugal force will be generated. In the presence of the stirring blade assembly (33), the connecting rods (31) approach each other, and the stirring blade assembly (33) moves towards the inner wall of the sealed tank (10). At this time, the radius is large and the shear force is also large. It is necessary to control the running time and add sensitive ingredients. S104. Complete the mixing of the pressure-sensitive adhesive.

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