Preparation method and equipment of medical-grade UV pressure-sensitive adhesive

Abstract

The invention relates to the technical field of pressure-sensitive adhesive preparation, in particular to a preparation method and equipment of a medical-grade UV pressure-sensitive adhesive, a piston cylinder and an annular containing box are both fixedly mounted at the top of a mixing cylinder, a piston plate is slidably mounted in the piston cylinder, and a piston pipe is fixedly connected to the bottom of the piston plate; the piston barrel is provided with a through hole, the piston tube is communicated with an inner cavity of the piston barrel through the through hole, the bottom end of the piston tube is fixedly connected with a liquid flowing ring set, the liquid flowing ring set is communicated with the piston tube and used for releasing mineral oil in the piston barrel, and the annular containing box is located outside the piston barrel and enables the piston barrel to be communicated with the annular containing box through the through hole. In the process of releasing various additives, the additives are released in the mineral oil in a spiral descending manner, so that the additives are uniformly distributed in the mineral oil, the uniformity degree of a mixture is effectively improved, the time required for stirring the mixture is shortened, and the mixing efficiency is improved.

Description

Technical Field

[0001] This invention relates to the field of pressure-sensitive adhesive preparation technology, specifically to a method and equipment for preparing medical-grade UV pressure-sensitive adhesive. Background Technology

[0002] Pressure-sensitive adhesives, also known as pressure-sensitive adhesives or self-adhesive adhesives, are the second most widely used type of pressure-sensitive adhesive after rubber. They are copolymers of acrylate monomers and other vinyl monomers and can be broadly classified into cross-linked and non-cross-linked types. They have no effect on the skin and are suitable for manufacturing medical adhesive tapes.

[0003] When preparing pressure-sensitive adhesives, additives such as tackifiers and SBCs are required. When mixing these adhesives, since the required pressure-sensitive adhesive is generated through a chemical reaction, the additives or mineral oils used as base materials need to be fully mixed. Therefore, a high-power motor is used to drive the stirring blades to ensure thorough mixing, which affects the preparation efficiency of the pressure-sensitive adhesive and requires a large amount of energy. To address this, we propose a preparation method and equipment for medical-grade UV pressure-sensitive adhesives. Summary of the Invention

[0004] In view of the above-mentioned shortcomings of the prior art, the present invention provides a method and equipment for preparing medical-grade UV pressure-sensitive adhesive, which can effectively solve the problem of how to improve mixing efficiency in the prior art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: This invention provides a preparation device for medical-grade UV pressure-sensitive adhesive, including a mixing cylinder, a piston cylinder and an annular receiving box fixedly installed on the top of the mixing cylinder, a piston plate slidably installed inside the piston cylinder, a piston tube fixedly connected to the bottom of the piston plate, and the piston tube communicating with the internal cavity of the piston cylinder through a through hole. The piston tube has a liquid flow ring assembly fixedly connected to its bottom end. The liquid flow ring assembly is connected to the piston tube and is used to release mineral oil from the piston cylinder. The annular container is located outside the piston cylinder and is connected to the piston cylinder through a through hole. Multiple partition plates are vertically fixedly installed inside the annular container to divide the internal space of the annular container into several parts. Electromagnets are fixedly installed on the top and bottom inner walls of the mixing cylinder to generate magnetic force on the liquid flow ring assembly.

[0006] Specifically, the fluid flow ring assembly includes a first fluid flow ring fixedly installed on the bottom end of the piston tube. Multiple connecting pipes are installed through the first fluid flow ring. The outer ends of the connecting pipes are all fixedly connected to a second fluid flow ring. Both the first and second fluid flow rings are made of magnetic material with their magnetic poles distributed vertically. Both the first and second fluid flow rings are hollow structures, and the first fluid flow ring is interconnected with the piston tube through a through hole. Multiple connecting pipes are installed through the top of both the first fluid flow ring and the outlet pipe.

[0007] Specifically, a flexible connecting frame is installed through the side plate of the second fluid ring, and a sector plate is fixedly installed on one side of the flexible connecting frame. The sector plate is connected to the second fluid ring, and multiple extrusion tubes are installed through the bottom of the sector plate. A limit plate is installed at an angle corresponding to the position of the sector plate at the top of the connecting tube to limit the angle when the sector plate rotates.

[0008] Specifically, the limiting plate is obliquely and fixedly installed at the bottom of the connecting pipe, and the limiting plate at the bottom of the connecting pipe and the limiting plate at the top of the connecting pipe are symmetrically arranged. An agitation component is fixedly installed on the top of the fan-shaped plate.

[0009] Specifically, the agitation assembly includes an arc-shaped plate fixedly installed on the top of the fan-shaped plate, with the arc-shaped plates arranged in pairs and their arc-shaped convex surfaces adjacent to each other within the same group.

[0010] Specifically, the concave surfaces of the adjacent arc-shaped plates bulge outward to form a flat section. A connecting frame is fixedly installed on the top of the adjacent flat sections. A rotating plate is rotatably installed between the connecting frame and the fan-shaped plate. A first stirring plate and a second stirring plate are fixedly installed at one end of the rotating plate. The length of the second stirring plate is twice that of the first stirring plate. A force-receiving magnet is fixedly installed on one side of both the first and second stirring plates. A driving magnet that generates magnetic repulsion force against the force-receiving magnet is fixedly installed on one side of the flat section.

[0011] Specifically, the piston cylinder has a connecting groove for communicating with the annular receiving box. A connecting ring is rotatably installed on the bottom of the inner wall of the piston cylinder. Multiple second inclined blocks are uniformly fixed on the inner diameter wall of the connecting ring. The number of second inclined blocks is one less than the number of connecting grooves. The second inclined blocks block or open the connecting grooves when the connecting ring rotates. Multiple first inclined blocks are fixedly installed on the bottom of the piston plate at the position corresponding to the second inclined blocks.

[0012] A method for preparing a medical-grade UV pressure-sensitive adhesive for use in the above-mentioned preparation equipment includes the following steps: S1. Mineral oil is stored in the piston cylinder, and antioxidants, thickeners and SBCs and other auxiliary additives are stored in the annular containment box. S2. The mineral oil in the piston cylinder is introduced into the mixing cylinder, and then one of the additives in the annular container is introduced into the mixing cylinder in a spiral and slow downward manner. S3. After introducing one of the additives into the annular container, the additives that are divided into different groups in the annular container are sequentially introduced into the mixing cylinder, and the thickeners in the annular container are stored separately. S4. The mixture in the mixing drum is heated, and the pressure-sensitive adhesive is drawn out of the mixing drum through the discharge pipe by an external pump.

[0013] The technical solution provided by this invention has the following advantages compared with known public technologies: This invention releases various additives into mineral oil using a spiral descent method, allowing the additives to be evenly distributed within the mineral oil, effectively improving the uniformity of the mixture, reducing the time required to stir the mixture, and increasing mixing efficiency. Simultaneously, the variable-position fan-shaped plate is used to release the additive in a spiral when descending and to stir the mixture in the original direction of rotation when rising, which can effectively and fully stir the mixture and further promote the mixing degree of each component in the mineral oil. With the second inclined block blocking or opening the connecting groove, additives can be released in portions or categories, such as thickeners or SBCs, which better meets actual production needs and can effectively improve production efficiency. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are merely some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without any creative effort.

[0015] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the half-section top view of the present invention; Figure 3 This is a schematic diagram of the structure of the present invention from a half-section bottom view; Figure 4 For the present invention Figure 3 Enlarged view of point A in the middle; Figure 5 This is a schematic cross-sectional view of the first and second flow rings of the present invention. Figure 6 For the present invention Figure 5 Enlarged view at point B in the middle; Figure 7 For the present invention Figure 5 Enlarged view at point C; Figure 8 This is a schematic diagram of the structure of the sector plate of the present invention; Figure 9 This is a schematic diagram of the internal structure of the piston cylinder of the present invention.

[0016] The labels in the diagram represent: 1. Mixing cylinder; 2. Discharge pipe; 3. Electromagnet; 4. Liquid flow ring assembly; 401. First liquid flow ring; 402. Connecting pipe; 403. Discharge pipe; 404. Second liquid flow ring; 405. Flexible connecting frame; 406. Fan-shaped plate; 407. Extrusion pipe; 408. Limiting plate; 409. Arc-shaped plate; 410. Straight section; 411. Connecting frame; 412. Rotating plate; 413. First stirring plate; 414. Second stirring plate; 415. Force-receiving magnet; 416. Driving magnet; 5. Piston tube; 6. Piston plate; 7. Piston cylinder; 8. Annular receiving box; 9. Divider plate; 10. First inclined block; 11. Connecting ring; 12. Second inclined block; 13. Connecting groove. Detailed Implementation

[0017] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0018] The present invention will be further described below with reference to embodiments.

[0019] Example:

[0020] Reference Figures 1 to 9 A medical-grade UV pressure-sensitive adhesive preparation device includes a mixing cylinder 1. A piston cylinder 7 and an annular receiving box 8 are both fixedly installed on the top of the mixing cylinder 1. A piston plate 6 is slidably installed inside the piston cylinder 7. A piston tube 5 is fixedly connected to the bottom of the piston plate 6. The piston tube 5 communicates with the internal cavity of the piston cylinder 7 through a through hole. A liquid flow ring group 4 is fixedly connected to the bottom end of the piston tube 5. The liquid flow ring group 4 is connected to the piston tube 5 and is used to release mineral oil in the piston cylinder 7. The annular receiving box 8 is located outside the piston cylinder 7 and is connected to the piston cylinder 7 through a through hole. Multiple partition plates 9 are vertically fixedly installed inside the annular receiving box 8 to divide the internal space of the annular receiving box 8 into several parts. Electromagnets 3 are fixedly installed on the top inner wall and the bottom inner wall of the mixing cylinder 1 to generate magnetic force on the liquid flow ring group 4.

[0021] In use, a certain amount of mineral oil is first stored in the piston cylinder 7, and a certain amount of thickener or SBC is stored in the annular receiving box 8. Common SBCs are: styrene-isoprene-styrene SIS and styrene-butadiene-styrene SBS. As existing technology, the selection and composition of SBC are based on actual production needs and are not further limited here. Then, the lowered piston plate 6 squeezes the mineral oil in the piston cylinder 7, and the mineral oil is guided to the piston tube 5 through the through hole of the piston cylinder 7. The mineral oil in the piston tube 5 is released into the mixing cylinder 1 through the flow ring assembly 4. When the mineral oil is completely released, the piston plate 6 moves upward, through... A negative pressure is created below the piston plate 6, drawing the thickener or additives such as SBC from the annular container 8 into the piston cylinder 7. Then, during the next downward movement of the piston plate 6, the additive is released into the mineral oil in the mixing cylinder 1. During this release process, the liquid flow ring assembly 4 is immersed in the mineral oil, and as the liquid flow ring assembly 4 descends, the additive is slowly released into the mineral oil, resulting in a uniform distribution of the additive. This effectively prevents the thickener from agglomerating when heated and clumping together when added to the mineral oil. Furthermore, it reduces the stirring time in the subsequent mixing process, improving production efficiency.

[0022] Among them, the electromagnets 3 in the upper and lower positions can generate magnetic forces on the liquid flow ring group 4. When the liquid flow ring group 4 needs to descend, the upper electromagnet 3 generates magnetic repulsion on the liquid flow ring group 4, and the lower electromagnet 3 generates magnetic attraction on the liquid flow ring group 4. When the liquid flow ring group 4 needs to rise, the electromagnets 3 in the upper and lower positions generate magnetic attraction and magnetic repulsion on the liquid flow ring group 4 respectively.

[0023] It should be noted that if the tackifier needs to be added in multiple batches, the tackifier can be stored separately in adjacent cavities within the annular container 8. SBC and tackifier can be stored separately as needed.

[0024] Specifically, refer to Figures 1 to 9 The fluid ring assembly 4 includes a first fluid ring 401 fixedly installed on the bottom end of the piston tube 5. Multiple connecting pipes 402 are installed through the first fluid ring 401. The outer ends of the connecting pipes 402 are fixedly connected to a second fluid ring 404. Both the first fluid ring 401 and the second fluid ring 404 are made of magnetic material with their magnetic poles distributed vertically. Both the first fluid ring 401 and the second fluid ring 404 are hollow structures. The first fluid ring 401 is connected to the piston tube 5 through a through hole. Multiple connecting pipes 402 are installed through the top of both the first fluid ring 401 and the outlet pipe 403.

[0025] The first liquid flow ring 401 and the second liquid flow ring 404 are slid up and down in the mixing cylinder 1 by the magnetic force of the electromagnet 3. When the first liquid flow ring 401 and the second liquid flow ring 404 slide downward, the piston tube 5 is pulled down together, and the piston plate 6 slides down in the piston cylinder 7 together, forcing the mineral oil or other additives in the piston cylinder 7 into the piston tube 5, and releasing them into the mixing cylinder 1 through the liquid outlet pipe 403 on the first liquid flow ring 401 and the second liquid flow ring 404, so that the additives can be evenly released in the mixing cylinder 1.

[0026] Specifically, refer to Figures 1 to 9 A flexible connecting frame 405 is installed through the side plate of the second fluid ring 404. A sector plate 406 is fixedly installed on one side of the flexible connecting frame 405. The sector plate 406 is connected to the second fluid ring 404. A plurality of extrusion tubes 407 are installed through the bottom of the sector plate 406. A limit plate 408 is installed at an angle corresponding to the position of the connecting tube 402, which limits the angle of rotation of the sector plate 406.

[0027] Specifically, refer to Figures 1 to 9 The limiting plate 408 is obliquely fixedly installed at the bottom of the connecting pipe 402. The limiting plate 408 at the bottom of the connecting pipe 402 and the limiting plate 408 at the top of the connecting pipe 402 are symmetrically arranged. The top of the fan-shaped plate 406 is fixedly installed with a stirring component.

[0028] As the first flow ring 401 and the second flow ring 404 move downwards, the sector plate 406 rotates upwards relative to the connecting pipe 402 upon contact with the mineral oil and is held in place by the limiting plate 408. During this process, the additive passing through the connecting pipe 402 is released into the mineral oil in the mixing cylinder 1 through the extrusion pipe 407. Because the sector plate 406 rotates upwards, it experiences a horizontal thrust during contact with the mineral oil as the first flow ring 401 and the second flow ring 404 move downwards. This thrust drives the first flow ring 401 to rotate downwards. As the first and second flow rings 401 and 404 rotate, the additives released from the outlet pipe 403 and extrusion pipe 407 are released into the mineral oil during their downward and rotating motion. This ensures uniform release of the additives into the mineral oil, reducing subsequent stirring. Especially when adding thickeners, the dispersed and uniformly distributed thickeners can contact the mineral oil components effectively and are less likely to clump together, thus improving production efficiency. As the first and second flow rings 401 and 404 move upward, the sector plate 406 moves downward relative to the connecting pipe 402. The rotating fan-shaped plate 406 is held in place by the limiting plate 408. As the first and second flow rings 401 and 404 rise, the downward-flipping fan-shaped plate 406 also experiences a horizontal thrust, causing the first and second flow rings 401 and 404 to rotate. Simultaneously, the horizontal thrust experienced by the upward-flipping fan-shaped plate 406 during its ascent and downward-flipping descent is in the same direction. Therefore, the rotation direction of the first and second flow rings 401 and 404 remains unchanged during their ascent and descent. After the additive is released... The rising of the first liquid flow ring 401 and the second liquid flow ring 404 brings the stirring component on the fan-shaped plate 406 up with them, and they continue to rotate in the same direction as the first liquid flow ring 401 and the second liquid flow ring 404 when they descend. This allows the mixture in the mixing cylinder 1 to be continuously stirred in one direction, avoiding the first liquid flow ring 401 and the second liquid flow ring 404 from having different rotation directions when they rise and fall. It also stirs the additive released by rotation back to the vertical state, which can improve the mixing degree of the mixture in the mixing cylinder 1. Combined with the additive that has already been spirally released, it allows the additive to be fully mixed in the mineral oil.

[0029] Specifically, refer to Figures 1 to 9 The stirring assembly includes an arc plate 409 fixedly installed on the top of the fan-shaped plate 406. The arc plates 409 are arranged in pairs, and the arc-shaped convex surfaces of the arc plates 409 in the same group are adjacent to each other.

[0030] Specifically, refer to Figures 1 to 9The concave surfaces of the adjacent arc-shaped plate 409 protrude outward to form a flat section 410. A connecting frame 411 is fixedly installed on the top of the adjacent flat sections 410. A rotating plate 412 is rotatably installed between the connecting frame 411 and the fan-shaped plate 406. A first stirring plate 413 and a second stirring plate 414 are fixedly installed at one end of the rotating plate 412. The length of the second stirring plate 414 is twice that of the first stirring plate 413. A force-receiving magnet 415 is fixedly installed on one side of both the first stirring plate 413 and the second stirring plate 414. A driving magnet 416 that generates magnetic repulsion force against the force-receiving magnet 415 is fixedly installed on one side of the flat section 410.

[0031] When the sector plate 406 rises, it is in a downward-flipped position. As the sector plate 406 rotates, the mixture passing over its surface passes between the two arc-shaped plates 409. The mixture between the convex surfaces of the two arc-shaped plates 409 undergoes a transition from wide to narrow, allowing it to accelerate away from the convex surfaces and resulting in a higher degree of mixing. When passing between the two straight sections 410, the second stirring plate 414 and the first stirring plate 413 between them are compressed by the mixture. Since the second stirring plate 414 is longer than the first stirring plate 413, the force magnet 415 experiences greater pressure, causing the rotating plate 412 to rotate towards the position of the first stirring plate 413. Simultaneously, the rotating plate 412 rotates the second stirring plate 414, which faces the mixture directly. With a larger surface area, the rotating plate 412 can continuously rotate towards the first stirring plate 413 until the force-receiving magnet 415 on the first stirring plate 413 is subjected to the magnetic repulsion of the driving magnet 416. At this point, the rotating plate 412 will rotate towards the second stirring plate 414, causing the area of ​​the second stirring plate 414 facing the mixture to gradually decrease, while the area of ​​the first stirring plate 413 facing the mixture to gradually increase. Then, the force-receiving magnet 415 on the second stirring plate 414 is subjected to the magnetic repulsion of the driving magnet 416, causing the rotating plate 412 to rotate towards the first stirring plate 413. This process repeats, causing the rotating plate 412, the first stirring plate 413, and the second stirring plate 414 to continuously agitate the mixture. At the same time, due to the different local viscosity of the mixture during rotation, the first stirring plate 413 and the second stirring plate 414 are subjected to uneven forces, which can cause the rotating plate 412 to produce irregular oscillations, thereby increasing the agitation of the mixture.

[0032] Specifically, refer to Figures 1 to 9The piston cylinder 7 has a connecting groove 13 for communicating with the annular receiving box 8. A connecting ring 11 is rotatably installed on the bottom of the inner wall of the piston cylinder 7. Multiple second inclined blocks 12 are evenly fixed on the inner diameter wall of the connecting ring 11. The second inclined blocks 12 block or open the connecting groove 13 when the connecting ring 11 rotates. Multiple first inclined blocks 10 are fixedly installed on the bottom of the piston plate 6 at the position corresponding to the second inclined blocks 12.

[0033] When the piston plate 6 descends, the first inclined block 10 will squeeze the second inclined block 12, and through the contact of the inclined surfaces between the first inclined block 10 and the second inclined block 12, the second inclined block 12 will be driven to rotate with the connecting ring 11. Under rotation, the second inclined block 12 will block the connecting groove 13. After each descent of the piston plate 6, the driven second inclined block 12 will block the connecting groove 13 and open another connecting groove 13, so that the negative pressure below the piston plate 6 will draw in the additives in different cavities in the annular container 8. This achieves the purpose that each action of the first liquid flow ring 401 and the second liquid flow ring 404 can release additives with different components or added in batches into the mixing cylinder 1, which facilitates the production of pressure-sensitive adhesive.

[0034] It should be noted that since the number of second inclined blocks 12 is one less than the number of connecting slots 13, one connecting slot 13 will always be in an open state, while the other connecting slots 13 will be in a blocked state.

[0035] A method for preparing a medical-grade UV pressure-sensitive adhesive for use in the above-mentioned preparation equipment includes the following steps: S1. Mineral oil is stored in piston cylinder 7, and antioxidants, thickeners and SBC and other auxiliary additives are stored in annular container box 8. S2. The mineral oil in the piston cylinder 7 is introduced into the mixing cylinder 1, and then one of the additives in the annular container 8 is introduced into the mixing cylinder 1 in a spiral and slow downward manner. S3. After introducing one of the additives into the annular container 8, the additives in the annular container 8, which are divided into different groups, are sequentially introduced into the mixing cylinder 1, and the thickeners in the annular container 8 are stored separately. S4. The mixture in the mixing cylinder 1 is heated, and the pressure-sensitive adhesive is drawn out from the mixing cylinder 1 through the discharge pipe 2 by an external pump.

[0036] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions will not cause the essence of the corresponding technical solutions to deviate from the protection scope of the technical solutions of the embodiments of the present invention.

Claims

1. A preparation apparatus for medical-grade UV pressure-sensitive adhesive, comprising a mixing cylinder (1), characterized in that, The top of the mixing cylinder (1) is fixedly installed with a piston cylinder (7) and an annular receiving box (8). A piston plate (6) is slidably installed inside the piston cylinder (7). A piston tube (5) is fixedly connected to the bottom of the piston plate (6). The piston tube (5) communicates with the internal cavity of the piston cylinder (7) through a through hole. The piston tube (5) is fixedly connected to a liquid flow ring assembly (4) at its bottom end. The liquid flow ring assembly (4) is connected to the piston tube (5) and is used to release the mineral oil in the piston cylinder (7). The annular container (8) is located outside the piston cylinder (7) and is connected to the piston cylinder (7) through a through hole. Multiple partition plates (9) are vertically fixedly installed inside the annular container (8) to divide the internal space of the annular container (8) into several parts. Electromagnets (3) are fixedly installed on the top inner wall and bottom inner wall of the mixing cylinder (1) to generate magnetic force on the liquid flow ring assembly (4).

2. The equipment for preparing medical-grade UV pressure-sensitive adhesive according to claim 1, characterized in that, The fluid ring assembly (4) includes a first fluid ring (401) fixedly installed on the bottom end of the piston tube (5). Multiple connecting pipes (402) are installed through the first fluid ring (401). The outer ends of the connecting pipes (402) are fixedly connected to a second fluid ring (404). The first fluid ring (401) and the second fluid ring (404) are both made of magnetic material and the magnetic poles are distributed vertically. The first fluid ring (401) and the second fluid ring (404) are both hollow structures. The first fluid ring (401) and the piston tube (5) are interconnected through a through hole. Multiple connecting pipes (402) are installed through the top of the first fluid ring (401) and the outlet pipe (403).

3. The equipment for preparing medical-grade UV pressure-sensitive adhesive according to claim 2, characterized in that, A flexible connecting frame (405) is installed through the side plate of the second fluid ring (404). A sector plate (406) is fixedly installed on one side of the flexible connecting frame (405). The sector plate (406) is connected to the second fluid ring (404). Multiple extrusion tubes (407) are installed through the bottom of the sector plate (406). A limiting plate (408) is installed at an angle corresponding to the position of the sector plate (406) on the top of the connecting tube (402) to limit the angle of rotation of the sector plate (406).

4. The equipment for preparing medical-grade UV pressure-sensitive adhesive according to claim 3, characterized in that, The limiting plate (408) is obliquely fixedly installed at the bottom of the connecting pipe (402). The limiting plate (408) at the bottom of the connecting pipe (402) and the limiting plate (408) at the top of the connecting pipe (402) are symmetrically arranged. The agitation component is fixedly installed on the top of the fan-shaped plate (406).

5. The equipment for preparing medical-grade UV pressure-sensitive adhesive according to claim 4, characterized in that, The stirring assembly includes an arc plate (409) fixedly installed on the top of the fan-shaped plate (406), and the arc plates (409) are arranged in pairs with their arc-shaped convex surfaces adjacent to each other.

6. The equipment for preparing medical-grade UV pressure-sensitive adhesive according to claim 5, characterized in that, The concave surfaces of the adjacent arc-shaped plate (409) protrude outward to form a flat section (410). A connecting frame (411) is fixedly installed on the top of the adjacent flat section (410). A rotating plate (412) is rotatably installed between the connecting frame (411) and the fan-shaped plate (406). A first stirring plate (413) and a second stirring plate (414) are fixedly installed on one end of the rotating plate (412). The length of the second stirring plate (414) is twice that of the first stirring plate (413). A force-receiving magnet (415) is fixedly installed on one side of both the first stirring plate (413) and the second stirring plate (414). A driving magnet (416) that generates magnetic repulsion force on the force-receiving magnet (415) is fixedly installed on one side of the flat section (410).

7. The equipment for preparing medical-grade UV pressure-sensitive adhesive according to claim 6, characterized in that, The piston cylinder (7) is provided with a connecting groove (13) for communicating with the annular receiving box (8). A connecting ring (11) is rotatably installed on the bottom of the inner wall of the piston cylinder (7). Multiple second inclined blocks (12) are uniformly fixed on the inner diameter wall of the connecting ring (11). The number of second inclined blocks (12) is one less than the number of connecting grooves (13). The second inclined blocks (12) block or open the connecting grooves (13) when the connecting ring (11) rotates. Multiple first inclined blocks (10) are fixedly installed on the bottom of the piston plate (6) at the position corresponding to the second inclined blocks (12).

8. A method for preparing a medical-grade UV pressure-sensitive adhesive applied to the preparation equipment described in claim 7, characterized in that, Includes the following steps: S1. Mineral oil is stored in the piston cylinder (7), and antioxidants, thickeners and auxiliary additives such as SBC are stored in the annular container (8). S2. The mineral oil in the piston cylinder (7) is introduced into the mixing cylinder (1), and then one of the additives in the annular container (8) is introduced into the mixing cylinder (1) in a spiral and slow downward manner. S3. After introducing one of the additives into the annular container (8), the additives in the annular container (8) that are divided into different groups are sequentially introduced into the mixing cylinder (1), and the thickeners in the annular container (8) are stored separately. S4. The mixture in the mixing drum (1) is heated, and the pressure-sensitive adhesive is drawn out from the mixing drum (1) through the discharge pipe (2) by an external pump.

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