Oca pressure sensitive adhesive tape and process for its preparation

Abstract

This invention provides an OCA pressure-sensitive adhesive tape and its preparation process, relating to the field of OCA pressure-sensitive adhesive preparation technology. The OCA pressure-sensitive adhesive tape includes an OCA pressure-sensitive adhesive layer, an optically light-release PET layer laminated to the upper layer of the OCA pressure-sensitive adhesive layer, and an optically heavy-release PET layer laminated to the lower layer of the OCA pressure-sensitive adhesive layer. The OCA pressure-sensitive adhesive tape is prepared by mixing different acrylic monomers, adding a photoinitiator, coating the mixture onto the optically heavy-release PET layer, and simultaneously covering it with an optically light-release PET layer. The process uses UV curing to form an OCA pressure-sensitive adhesive film. Compared to existing technologies, by adjusting the ratio of hard and soft monomers and the application of functional monomers, the adhesive achieves a balance between hardness and flexibility. This resolves the contradiction between adhesive cohesion and temperature resistance versus flexibility and wetting properties. Furthermore, this organic combination of hard and soft segments significantly improves the adhesive's folding resistance, extends the screen's lifespan, and maintains the display effect.

Description

Technical Field

[0001] This disclosure relates to the field of OCA pressure-sensitive adhesive preparation technology, and in particular to an OCA pressure-sensitive adhesive tape and its preparation process. Background Technology

[0002] OCA tape, also known as optically transparent tape, is widely used for bonding glass in electronic screens. It requires high light transmittance, low acid value, and no bubbles after aging. With the application of foldable screens in electronic devices, OCA tape is also required to possess excellent toughness and bending resistance, maintaining its mechanical and physical properties without significant degradation after tens of thousands of folds. Currently, commonly used OCA pressure-sensitive tapes are prone to stress relaxation after more than 200,000 folds, leading to problems such as creases and bubbles between the screen and the OCA pressure-sensitive adhesive, affecting the screen's display quality. To address these issues, we have synthesized an OCA pressure-sensitive tape by adjusting the formulation and process, such as the ratio and distribution of soft and hard segments in the OCA pressure-sensitive adhesive and adjusting the functional monomers. This new tape not only withstands over 400,000 bending tests without creases or bubbles, but also maintains excellent aging resistance and transparency.

[0003] The hard segments, composed of rigid monomers, form the skeleton of the adhesive, providing strong cohesion and improving its temperature resistance. The soft segments, composed of soft monomers, offer high flexibility and strong wetting properties, enhancing the adhesive's bonding performance to materials. The application of functional monomers further integrates the hard and soft segments, allowing the adhesive to maintain good cohesion and temperature resistance while also ensuring flexibility and wetting properties. This organic combination of hard and soft segments also significantly improves the adhesive's folding resistance, extending the screen's lifespan and maintaining display quality. Summary of the Invention

[0004] This disclosure aims to at least partially address one of the technical problems in the related art.

[0005] Therefore, the purpose of this disclosure is to provide an OCA pressure-sensitive tape and its preparation process.

[0006] To achieve the above objectives, this disclosure provides an OCA pressure-sensitive adhesive tape, comprising an OCA pressure-sensitive adhesive layer, an optical light-release PET layer laminated on the upper layer of the OCA pressure-sensitive adhesive layer, and an optical heavy-release PET layer laminated on the lower layer of the OCA pressure-sensitive adhesive layer; the OCA pressure-sensitive adhesive tape is formed by mixing different acrylic monomers, adding a photoinitiator, coating the mixture onto the optical heavy-release PET layer, and simultaneously covering it with an optical light-release PET layer, using UV curing to form an OCA pressure-sensitive adhesive film.

[0007] An OCA pressure-sensitive adhesive tape manufacturing process, the manufacturing process comprising the following steps: (1) By weight, 8-20.5 parts of butyl acrylate, 63.5-82 parts of isooctyl acrylate, 2.6-4.2 parts of hydroxyethyl acrylate, 3-6.3 parts of hydroxybutyl acrylate, and 1.5-4.1 parts of isobornyl acrylate are mixed with 0.07-0.1% of photoinitiator 184 and 0.05%-0.12% of molecular weight regulator dodecyl mercaptan by weight of the above monomers to form mixture 1; and 0.07-0.15% of 184, 0.08%-0.13% of 1,6-hexanediol diacrylate and 0.25-0.37% of silane coupling agent 6040 by weight of the above monomers to form mixture 2; (2) Mix mixture 1 evenly in a mixing vessel and stir for 2-4 hours. Add the mixed mixture 1 to the prepolymerization vessel, purge with nitrogen for protection, turn on UVA, control the energy at 950±150mj / cm2, stir at 40-70 rpm, and control the reaction temperature at 35-40℃; (3) After reacting for 20-30 minutes in step (2) above, stop the UV and nitrogen protection and add mixture 2, stirring for 40-60 minutes. Transfer the material in the prepolymer reactor to a vacuum chamber, evacuate to 0.4-0.8 kPa, and evacuate for 40-80 minutes; (4) The prepolymerized acrylic pressure-sensitive adhesive is coated onto the optical heavy release PET layer through the discharge channel, and the optical light release PET layer is covered on the top through the moving component and the application component; (5) The moving component drives the scraper to apply the coating, and the moving component pulls the OCA pressure-sensitive tape into the UV curing chamber for curing.

[0008] Optionally, according to step (2), the mixing component is installed on one side of the coating table. The mixing component includes a mixing tank, and a prepolymer tank is provided on one side of the mixing tank. A feed pipe is provided at the upper end of the mixing tank, and a conveying pipe is fixed at the bottom of the mixing tank. The other end of the conveying pipe is fixedly connected to the top of the prepolymer tank, and an outlet pipe is fixed at the bottom of the prepolymer tank. The acrylic pressure-sensitive adhesive raw material is alternately fed into the mixing tank and the prepolymer tank through the feed pipe and stirred. The stirred mixture is then fed into the feeding component and sent out for coating.

[0009] Optionally, according to step (3), the feeding assembly includes a vacuum box, which is set at the top of the inlet end of the coating table, and the other end of the feeding tube is fixedly connected to the vacuum box. The bottom of the vacuum box is fixed with a feeding channel, and the outer surface of the vacuum box is fixed with a fixing frame. The fixing frame is fixed on both sides of the inlet end of the coating table. The inner walls of both sides of the feeding channel are fixed with convex plates, and a sliding plate is slidably connected to the convex plates. The bottom of the sliding plate is rotatably connected to an inclined plate through a rotating shaft. The outlet end of the vacuum box is equipped with an electromagnetic valve, and the size of the bottom opening of the feeding channel is matched with the limiting assembly to keep the range of the mixture fed out on the surface of the optical release PET layer.

[0010] Optionally, the limiting component includes limiting plates, with two sets of limiting plates symmetrically arranged on both sides of the coating table. A bidirectional screw is rotatably mounted at the inlet end of the coating table. A drive motor is fixed at one end of the bidirectional screw on the coating table, and the output end of the drive motor is fixedly connected to the bidirectional screw. A slide rod is fixed at the outlet end of the coating table. One end of the limiting plate is threaded onto the bidirectional screw, and the other end of the limiting plate is slidably mounted onto the slide rod. The bottom of the inclined plate is rotatably connected to the top of the limiting plate via a rotating shaft. When the limiting plate moves along the surface of the coating table as the bidirectional screw rotates, the two sets of limiting plates adjust the width of the optical release PET layer. Simultaneously, the inclined surface of the inclined plate moves in the same direction as the limiting plate, and the direction of the discharged mixture is towards the middle of the two limiting plates.

[0011] Optionally, according to step (4), the application assembly includes a movable frame that slides along the surface of the coating table. The top of both sides of the coating table is provided with a sliding groove, and the bottom of both sides of the movable frame slides along the inside of the sliding groove. An upper mounting seat is installed at the upper end of the movable frame, and a winding shaft is clamped between the movable frame and the upper mounting seat. The optical light release PET layer is wound on the winding shaft. The movable frame and the upper mounting seat are locked together by bolts. Under the push of the movable assembly, the movable frame can slide along the sliding groove to apply a composite optical light release PET layer to the surface of the coated optical heavy release PET layer.

[0012] Optionally, the movable frame is slidably mounted with a sliding frame facing the feeding assembly, and two sliders are symmetrically slidably connected on the surface of the sliding frame. A first spring is fixed between the sliders and the sliding frame. A scraper is fixed to the bottom of the slider, and the inner surfaces of the two scrapers are slidably connected. A pressure plate is provided on the other side of the movable frame. An adjusting screw is threaded into the top of the pressure plate, and the bottom of the adjusting screw is rotatably connected to the pressure plate. The sliding frame is fixedly connected to the pressure plate. By rotating the adjusting screw, the position of the pressure plate and the scraper is adjusted, the OCA pressure-sensitive adhesive layer is evenly coated with a scraper, the thickness of the OCA pressure-sensitive tape for bonding the optical light release PET layer is adjusted, and the optical light release PET layer is tightly bonded to the OCA pressure-sensitive adhesive layer.

[0013] Optionally, according to step (5), the moving component includes a first electric push rod, which has two sets fixed on the outer walls of both sides of the coating table. The extended end of the first electric push rod is equipped with a clamping frame, and the top of the clamping frame is fixed with a second electric push rod. The extended end of the second electric push rod is fixed with a clamping plate, and the clamping plate and clamping frame clamp the two sides of the OCA pressure-sensitive adhesive tape. The OCA pressure-sensitive adhesive tape, after being cured by UV, is fed out of the coating table. The clamping frame and clamping plate clamp the top and bottom of both sides of the OCA pressure-sensitive adhesive tape. The extended end of the first electric push rod drives the OCA pressure-sensitive adhesive tape to move outward by a certain length, while simultaneously driving the application component to move towards the feeding component.

[0014] Optionally, a telescopic plate is fixed to the extended end of the first electric push rod, and the extended end of the telescopic plate is fixedly connected to the clamping frame. A fixing block is fixed to the side of the limiting plate facing the telescopic plate, and the other end of the fixing block is fixedly connected to the extended end of the telescopic plate. The telescopic plate and the limiting plate are connected by the fixing block. When the position of the limiting plate is adjusted, the length of the telescopic plate extends, keeping the position of the clamping frame close to both sides of the OCA pressure-sensitive tape, and maintaining the connection between the clamping frame and the first electric push rod.

[0015] Optionally, a first toothed plate is fixed to the extended end of the first electric push rod, and a gear is rotatably mounted on the middle outer wall of the coating table. The gear meshes with the first toothed plate, and a second toothed plate meshes with the top of the gear. The second toothed plate is fixedly connected to the moving frame. When the extended end of the first electric push rod pulls the OCA pressure-sensitive adhesive tape, the first toothed plate meshes with the gear, and the gear then meshes with the second toothed plate, causing the first and second toothed plates to move in opposite directions. The second toothed plate drives the moving frame to move along the surface of the coating table to apply and flatten the OCA pressure-sensitive adhesive tape.

[0016] The technical solution provided in this disclosure may include the following beneficial effects: 1. This invention drives a bidirectional screw to rotate via a drive motor. The limiting plate is threadedly engaged with the bidirectional screw, and the other end slides along the slide bar. The positions of the two limiting plates are adjusted on the coating table to accommodate the width of the optical release PET layer. This facilitates the optical release PET layer to be transported and coated in a straight line, avoiding problems such as coating or bonding misalignment. 2. This invention adjusts the position of the pressure plate by adjusting the screw, which can adjust the thickness. It can also adjust the position of the scraper. The pressure plate can move laterally and vertically along the moving notch of the limiting plate. There is a certain height between the scraper and the pressure plate. This height meets the thickness of the optical light release PET layer. Two sets of scrapers that are staggered and slidably connected slide along the sliding frame. This can be coordinated with the adjustment of the position of the two limiting plates to maintain the length of the scraper and cover the entire internal space of the limiting plate, thereby coating the OCA pressure-sensitive adhesive layer on the limiting plate. 3. The OCA pressure-sensitive tape cured by UV is fed out from the rear end of the coating table. By adjusting the position of the limiting plate, the telescopic plate extends and retracts to keep the clamping frame attached to both sides of the OCA pressure-sensitive tape. The clamping plate and clamping frame are driven by the second electric push rod to clamp the top and bottom of the side of the OCA pressure-sensitive tape. Then the first electric push rod pushes the clamped OCA pressure-sensitive tape to move outward a certain distance. During this process, the first toothed plate moves together with the extended end of the first electric push rod. The first toothed plate meshes with the gear, so that during the meshing of the second toothed plate with the gear, the second toothed plate moves in the opposite direction to the first toothed plate. The application assembly moves along the surface of the coating table, thereby unwinding the optical light release PET layer on the take-up shaft, applying it to the OCA pressure-sensitive tape, and maintaining flatness after being squeezed by the pressure plate, and spreading the OCA pressure-sensitive tape evenly. 4. Compared with existing technologies, this invention, by adjusting the ratio of hard and soft monomers and the application of functional monomers, enables the adhesive to balance hardness and flexibility. It resolves the contradiction between adhesive cohesion and temperature resistance versus flexibility and wetting properties. Simultaneously, this organic combination of hard and soft segments significantly improves the adhesive's folding resistance, extends the screen's lifespan, and maintains the display's effectiveness.

[0017] Additional aspects and advantages of this disclosure will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this disclosure. Attached Figure Description

[0018] The above and / or additional aspects and advantages of this disclosure will become apparent and readily understood from the following description of the embodiments taken in conjunction with the accompanying drawings, in which: Figure 1 This is a schematic flowchart of an OCA pressure-sensitive tape preparation process according to an embodiment of this disclosure; Figure 2This is a schematic diagram of the overall structure in an OCA pressure-sensitive tape manufacturing process according to an embodiment of the present disclosure; Figure 3 This is a schematic diagram of the hybrid component structure in an OCA pressure-sensitive tape manufacturing process according to an embodiment of this disclosure; Figure 4 This is a schematic diagram of the moving component structure in an OCA pressure-sensitive tape manufacturing process according to an embodiment of this disclosure; Figure 5 This is a schematic diagram of the connection between the clamping frame and the moving component in an OCA pressure-sensitive tape manufacturing process according to an embodiment of this disclosure; Figure 6 This is a schematic diagram of the coating table outlet end in an OCA pressure-sensitive tape preparation process according to an embodiment of this disclosure; Figure 7 This is a schematic diagram of the coating station inlet end in an OCA pressure-sensitive tape preparation process according to an embodiment of this disclosure; Figure 8 This is a schematic diagram of the composition of OCA pressure-sensitive tape in an embodiment of the present disclosure. Figure 9 This is a schematic diagram of the connection between the pressure plate and the movable frame in an OCA pressure-sensitive tape manufacturing process according to an embodiment of this disclosure; Figure 10 This is a schematic diagram of the internal structure of the feeding channel in an OCA pressure-sensitive tape manufacturing process according to an embodiment of this disclosure; Figure 11 This is a schematic diagram of the internal structure of a vacuum chamber in an OCA pressure-sensitive tape preparation process according to an embodiment of this disclosure; Figure 12 This is a schematic diagram of the bonding component structure in the OCA pressure-sensitive tape manufacturing process according to an embodiment of this disclosure; As shown in the figure: 1. Coating table; 2. Mixing component; 21. Mixing vessel; 22. Feed pipe; 23. Conveying pipe; 24. Prepolymerization vessel; 25. Discharge pipe; 3. Feeding assembly; 31. Vacuum box; 32. Fixing frame; 33. Feeding channel; 34. Inclined plate; 35. Protruding plate; 36. Slide plate; 4. Moving component; 41. First electric push rod; 42. First toothed plate; 43. Gear; 44. Second toothed plate; 45. Telescopic plate; 46. Clamping frame; 47. Second electric push rod; 48. Clamping plate; 49. Fixing block; 410. Slide groove; 5. Application assembly; 51. Moving frame; 52. Rewinding shaft; 53. Upper mounting base; 54. Pressure plate; 55. Adjusting screw; 56. Sliding frame; 57. Sliding block; 58. Scraper; 59. First spring; 6. UV curing chamber; 7. Limiting component; 71. Limiting plate; 72. Slide rod; 73. Moving notch; 74. Bidirectional screw; 75. Drive motor; 8. OCA pressure-sensitive tape; 81. OCA pressure-sensitive adhesive layer; 82. Optical light release PET layer; 83. Optical heavy release PET layer. Detailed Implementation

[0019] Embodiments of this disclosure are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are used only to explain this disclosure, and should not be construed as limiting this disclosure. Rather, embodiments of this disclosure include all variations, modifications, and equivalents falling within the spirit and scope of the appended claims.

[0020] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 6 As shown, an OCA pressure-sensitive adhesive tape manufacturing process includes the following steps: (1) By weight, 8-20.5 parts of butyl acrylate, 63.5-82 parts of isooctyl acrylate, 2.6-4.2 parts of hydroxyethyl acrylate, 3-6.3 parts of hydroxybutyl acrylate, and 1.5-4.1 parts of isobornyl acrylate are mixed with 0.07-0.1% of photoinitiator 184 and 0.05%-0.12% of molecular weight regulator dodecyl mercaptan by weight of the above monomers to form mixture 1; and 0.07-0.15% of 184, 0.08%-0.13% of 1,6-hexanediol diacrylate and 0.25-0.37% of silane coupling agent 6040 by weight of the above monomers to form mixture 2; (2) Mix mixture 1 evenly in a mixing vessel and stir for 2-4 hours. Add the mixed mixture 1 to the prepolymerization vessel, purge with nitrogen for protection, turn on UVA, control the energy at 950±150mj / cm2, stir at 40-70 rpm, and control the reaction temperature at 35-40℃; (3) After reacting for 20-30 minutes in step (2) above, stop the UV and nitrogen protection and add mixture 2, stirring for 40-60 minutes. Transfer the material in the prepolymer reactor to a vacuum chamber, evacuate to 0.4-0.8 kPa, and evacuate for 40-80 minutes; (4) The prepolymerized acrylic pressure-sensitive adhesive is coated onto the optical heavy release PET layer through the discharge channel, and the optical light release PET layer is covered on the top through the moving component and the application component; (5) The moving component drives the scraper to apply the coating, and the moving component pulls the OCA pressure-sensitive tape into the UV curing chamber for curing.

[0021] like Figure 3 , Figure 4 , Figure 10 and Figure 11 As shown, in some embodiments, the mixing component 2 is installed on one side of the coating table 1. The mixing component 2 includes a mixing tank 21, and a prepolymerization tank 24 is provided on one side of the mixing tank 21. A feed pipe 22 is provided at the upper end of the mixing tank 21, and a conveying pipe 23 is fixed at the bottom of the mixing tank 21. The other end of the conveying pipe 23 is fixedly connected to the top of the prepolymerization tank 24, and an outlet pipe 25 is fixed at the bottom of the prepolymerization tank 24. Acrylic pressure-sensitive adhesive raw material is alternately fed into the mixing tank 21 and the prepolymerization tank 24 through the feed pipe 22 and stirred. The stirred mixture is then fed into the feeding component 3 for coating. The feeding component 3 includes a vacuum box 31, which is located at the top of the inlet end of the coating table 1. The other end of the outlet pipe 25 is fixedly connected to the vacuum box 31. An outlet channel 33 is fixed at the bottom of the vacuum box 31, and a fixing frame 32 is fixed on the outer surface of the vacuum box 31. The fixing frame 32 is fixed on both sides of the inlet end of the coating table 1. The outlet channel 33... The inner walls on both sides are fixed with convex plates 35, and slide plates 36 are slidably connected to the convex plates 35. The bottom of the slide plates 36 is rotatably connected to the inclined plates 34 via a rotating shaft. The outlet end of the vacuum box 31 is equipped with an electromagnetic valve. The size of the bottom opening of the delivery channel 33 matches the limiting component 7 to keep the range of the mixture delivery within the surface of the optical release PET layer 83. The raw materials for preparing the OCA pressure-sensitive adhesive layer 81 are added to the mixing vessel 21 and the prepolymer vessel 24 for two stirrings. The stirred mixture is then sent into the vacuum box 31. Before coating, the electromagnetic valve at the bottom of the vacuum box 31 is opened, and the mixture is delivered through the delivery channel and falls onto the surface of the optical release PET layer 83. Due to the sliding of the inclined plates 34 and slide plates 36 along the convex plates 35, when the position of the limiting plate 71 is adjusted, the slide plates 36 slide along the convex plates 35, maintaining the connection between the inclined plates 34 and the limiting plate 71. This also guides and limits the position of the mixture delivery, allowing it to enter between the two sets of limiting plates 71.

[0022] like Figure 5 , Figure 6 , Figure 7 and Figure 8As shown, in some embodiments, the limiting component 7 includes a limiting plate 71, and two sets of the limiting plates 71 are symmetrically arranged on both sides of the coating table 1. A bidirectional screw 74 is rotatably mounted at the inlet end of the coating table 1. A drive motor 75 is fixed at one end of the bidirectional screw 74 on the coating table 1, and the output end of the drive motor 75 is fixedly connected to the bidirectional screw 74. A slide rod 72 is fixed at the outlet end of the coating table 1. One end of the limiting plate 71 is screwed... The inclined plate 34 is fitted onto the bidirectional screw 74, and the other end of the limiting plate 71 is slidably fitted onto the slide rod 72; wherein, the bottom of the inclined plate 34 is rotatably connected to the top of the limiting plate 71 through a rotating shaft. When the limiting plate 71 moves along the surface of the coating table 1 as the bidirectional screw 74 rotates, the two sets of limiting plates 71 adjust the width of the optical release PET layer 83. At the same time, the inclined surface of the inclined plate 34 moves in the same direction as the limiting plate 71, and the direction of the mixture being delivered is towards the middle of the two limiting plates 71.

[0023] Understandably, the drive motor 75 drives the bidirectional screw 74 to rotate, the limiting plate 71 is threadedly engaged with the bidirectional screw 74, and the other end slides along the slide bar 72. The positions of the two limiting plates 71 are adjusted on the coating table 1 to adjust the width of the optical release PET layer 83, so that the optical release PET layer 83 can be transported and coated in a straight line, avoiding problems such as coating or bonding misalignment.

[0024] like Figure 8 , Figure 9 and Figure 12As shown, in some embodiments, the application assembly 5 includes a movable frame 51 that slides along the surface of the coating table 1. The top sides of the coating table 1 are provided with grooves 410, and the bottom sides of the movable frame 51 slide along the inside of the grooves 410. An upper mounting base 53 is installed at the upper end of the movable frame 51. A take-up shaft 52 is clamped between the movable frame 51 and the upper mounting base 53, and the optical light release PET layer 82 is wound onto the take-up shaft 52. The movable frame 51 and the upper mounting base 53 are locked together by bolts. Under the push of the movable assembly 4, the movable frame 51 can slide along the grooves 410 to laminate the optical light release PET layer 82 onto the surface of the coated optical heavy release PET layer 83. A sliding frame 56 is slidably installed on the movable frame 51 towards the feeding assembly 3. Two sliders 57 are symmetrically slidably connected on the surface of the slide frame 56, and a first spring 59 is fixed between the sliders 57 and the slide frame 56. A scraper 58 is fixed at the bottom of the sliders 57, and the inner surfaces of the two scrapers 58 are slidably connected. A pressure plate 54 is provided on the other side of the moving frame 51. An adjusting screw 55 is threadedly inserted into the top of the moving frame 51 and the bottom of the adjusting screw 55 is rotatably connected to the pressure plate 54. The slide frame 56 is fixedly connected to the pressure plate 54. By rotating the adjusting screw 55, the position of the pressure plate 54 and the scraper 58 is adjusted, the thickness of the OCA pressure-sensitive adhesive layer 81 is evenly spread by the scraper, the thickness of the OCA pressure-sensitive tape 8 for bonding the optical light release PET layer 82 is adjusted, and the optical light release PET layer 82 is tightly bonded to the OCA pressure-sensitive adhesive layer 81.

[0025] Understandably, by adjusting the position of the pressure plate 54 by adjusting the screw 55, the thickness can be adjusted, and the position of the scraper 58 can also be adjusted. The pressure plate 54 can move laterally and vertically along the moving notch 73 of the limiting plate 71, and there is a certain height between the scraper 58 and the pressure plate 54. This height meets the thickness of the optical light release PET layer 82. The two sets of scrapers 58 that are mutually staggered and slidably connected slide along the slide frame 56, which can be used in conjunction with the adjustment of the positions of the two limiting plates 71 to maintain the length of the scraper 58, covering the entire internal space of the limiting plate 71, thereby coating the OCA pressure-sensitive adhesive layer 81 on the limiting plate 71.

[0026] like Figure 4 and Figure 5As shown, in some embodiments, the moving component 4 includes a first electric push rod 41, which has two sets fixed to the outer walls on both sides of the coating table 1. A clamping frame 46 is installed on the extended end of the first electric push rod 41, and a second electric push rod 47 is fixed to the top of the clamping frame 46. A clamping plate 48 is fixed to the extended end of the second electric push rod 47, and the clamping plate 48 and clamping frame 46 clamp the two sides of the OCA pressure-sensitive adhesive tape 8. The OCA pressure-sensitive adhesive tape 8, after passing through the UV curing chamber 6, is then delivered... The coating table 1 clamps the top and bottom sides of the OCA pressure-sensitive tape 8 via the clamping frame 46 and clamping plate 48. The extended end of the first electric push rod 41 moves the OCA pressure-sensitive tape 8 outwards by a certain length, simultaneously moving the application assembly 5 towards the feeding assembly 3. A telescopic plate 45 is fixed to the extended end of the first electric push rod 41, and the extended end of the telescopic plate 45 is fixedly connected to the clamping frame 46. A fixing block 49 is fixed to the side of the limiting plate 71 facing the telescopic plate 45, and the other end of the fixing block 49 is connected to the telescopic plate 46. The extended end of plate 45 is fixedly connected; wherein, the telescopic plate 45 and the limiting plate 71 are connected by the fixing block 49. When the position of the limiting plate 71 is adjusted, the length of the telescopic plate 45 is extended, keeping the position of the clamping frame 46 close to both sides of the OCA pressure-sensitive tape 8, and keeping the clamping frame 46 connected to the first electric push rod 41. The extended end of the first electric push rod 41 is fixed with a first toothed plate 42. A gear 43 is rotatably mounted on the middle outer wall of the coating table 1. The gear 43 meshes with the first toothed plate 42. The top of the gear 43 is meshed with a second toothed plate 44, and the second toothed plate 44 is fixedly connected to the moving frame 51. When the extended end of the first electric push rod 41 pulls the OCA pressure-sensitive adhesive tape 8 to move, the first toothed plate 42 meshes with the gear 43 and drives it. The gear 43 then meshes with the second toothed plate 44, causing the first toothed plate 42 and the second toothed plate 44 to move in opposite directions. The second toothed plate 44 drives the moving frame 51 to move along the surface of the coating table 1 to apply and flatten the OCA pressure-sensitive adhesive tape 8.

[0027] It should be noted that after passing through the UV curing chamber 6, the OCA pressure-sensitive tape 8 is fed out from the rear end of the coating table 1. By adjusting the position of the limiting plate 71, the telescopic plate 45 extends and retracts to keep the clamping frame 46 attached to both sides of the OCA pressure-sensitive tape 8. The second electric push rod 47 drives the clamping plate 48 and the clamping frame 46 to clamp the top and bottom sides of the OCA pressure-sensitive tape 8. Then, the first electric push rod 41 pushes the clamped OCA pressure-sensitive tape 8 to move outward a certain distance. During this process, the first tooth... Plate 42 moves together with the extended end of the first electric push rod 41. The first toothed plate 42 meshes with the gear 43, so that during the meshing of the second toothed plate 44 with the gear 43, the second toothed plate 44 moves in the opposite direction to the first toothed plate 42. The application assembly 5 moves along the surface of the coating table 1, thereby unwinding the optical light release PET layer 82 on the take-up shaft 52, applying it to the OCA pressure-sensitive adhesive layer 81, and maintaining flatness after being squeezed by the pressure plate 54, and spreading the OCA pressure-sensitive adhesive layer 81 evenly.

[0028] like Figure 8 As shown, an OCA pressure-sensitive tape 8 includes an OCA pressure-sensitive adhesive layer 81, an optically light-release PET layer 82 bonded to the upper layer of the OCA pressure-sensitive adhesive layer 81, and an optically heavy-release PET layer 83 bonded to the lower layer of the OCA pressure-sensitive adhesive layer 81. The OCA pressure-sensitive tape 8 is prepared by mixing different acrylic monomers, adding a photoinitiator, coating the mixture onto the optically heavy-release PET layer 83, and simultaneously covering it with the optically light-release PET layer 82. The process uses a UV curing box 6 to form an OCA pressure-sensitive adhesive film. In this scheme, other adhesive materials can also be prepared by combining EPDM rubber, polyvinyl chloride, elastomer-modified bitumen, plastisol-modified bitumen, self-adhesive rubber bitumen, thermoplastic polyolefin waterproof membrane, fiberglass asphalt shingles, and sodium bentonite waterproof blanket. According to the weight proportions of Formula 1, Formula 2 and Formula 3 in Table 1, accurately weigh butyl acrylate, isooctyl acrylate, hydroxyethyl acrylate, hydroxybutyl acrylate, isobornyl acrylate, photoinitiator 184 and molecular weight regulator dodecyl mercaptan and mix them together as Mixture 1. Mix mixture 1 thoroughly in mixing vessel 21 and stir for 2-4 hours. Add the mixed mixture 1 to prepolymerization vessel 24 and purge with nitrogen protection. Turn on UVA, control the energy at 950±150mj / cm2, stir at 40-70 rpm, control the reaction temperature at 35-40℃, and react for 20-30 minutes. Then stop UV and nitrogen protection.

[0029] Accurately weigh 184, 1,6-hexanediol diacrylate and silane coupling agent 6040 to form mixture 2. Add mixture 2 to prepolymer reactor 24 and stir for 40-60 minutes. Transfer the material in prepolymer reactor 24 to a vacuum tank and evacuate at 0.4-0.8 kPa for 40-80 minutes.

[0030] Working principle: In use, the raw materials for preparing the OCA pressure-sensitive adhesive layer 81 are added to the mixing vessel 21 and the prepolymerization vessel 24 and stirred twice. The stirred mixture is then sent into the vacuum chamber 31. Before coating, the solenoid valve at the bottom of the vacuum chamber 31 is opened, and the mixture is fed out through the feeding channel and falls onto the surface of the optical release PET layer 83. Due to the sliding of the inclined plate 34 and the sliding plate 36 along the convex plate 35, the sliding plate 36 slides along the convex plate 35 when the position of the limiting plate 71 is adjusted, maintaining the connection between the inclined plate 34 and the limiting plate 71. This also guides and limits the position of the mixture, allowing it to enter between the two sets of limiting plates 71, driving the electric... Machine 75 drives the bidirectional screw 74 to rotate. The limiting plate 71 is threadedly engaged with the bidirectional screw 74, and the other end slides along the slide bar 72. The positions of the two limiting plates 71 are adjusted on the coating table 1 to adjust the width of the optical release PET layer 83, thus facilitating the straight-line conveying and coating of the optical release PET layer 83 and avoiding problems such as coating or bonding misalignment. The position of the pressure plate 54 can be adjusted by adjusting the screw 55 to adjust the thickness. At the same time, the position of the scraper 58 can also be adjusted. The pressure plate 54 can move laterally and vertically along the moving notch 73 of the limiting plate 71, and there is a gap between the scraper 58 and the pressure plate 54. A fixed height is set, which meets the thickness of the optical light release PET layer 82. Two sets of mutually staggered sliding scrapers 58 slide along the sliding frame 56. This can be coordinated with the adjustment of the positions of the two limiting plates 71 to maintain the length of the scraper 58, covering the entire internal space of the limiting plate 71, thereby coating the OCA pressure-sensitive adhesive layer 81 on the limiting plate 71. After passing through the UV curing box 6, the OCA pressure-sensitive adhesive tape 8 is sent out from the rear end of the coating table 1. By adjusting the position of the limiting plate 71, the telescopic plate 45 extends and retracts to keep the clamping frame 46 attached to both sides of the OCA pressure-sensitive adhesive tape 8. The second electric push rod 47 drives the clamping plate 48 and the clamping frame 46 to adhere to the sides of the OCA pressure-sensitive adhesive tape 8. The top and bottom of the edge are clamped, and then the first electric push rod 41 pushes the clamped OCA pressure-sensitive adhesive tape 8 to move outward a certain distance. During this process, the first toothed plate 42 moves together with the extended end of the first electric push rod 41. The first toothed plate 42 meshes with the gear 43, so that the second toothed plate 44 and the gear 43 mesh. During the process, the second toothed plate 44 moves in the opposite direction to the first toothed plate 42. The application assembly 5 moves along the surface of the coating table 1, thereby unwinding the optical light release PET layer 82 on the take-up shaft 52, applying it to the OCA pressure-sensitive adhesive layer 81, and maintaining flatness after being squeezed by the pressure plate 54, and spreading the OCA pressure-sensitive adhesive layer 81 evenly.

[0031] In the description of this disclosure, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance. Furthermore, in the description of this disclosure, unless otherwise stated, "a plurality of" means two or more.

[0032] Any process or method description in the flowchart or otherwise herein can be understood as representing a module, segment, or portion of code comprising one or more executable instructions for implementing a particular logical function or process, and the scope of preferred embodiments of this disclosure includes additional implementations in which functions may be performed not in the order shown or discussed, including substantially simultaneously or in reverse order depending on the function involved, as will be understood by those skilled in the art to which embodiments of this disclosure pertain.

[0033] In the description of this specification, references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this disclosure. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0034] Although embodiments of the present disclosure have been shown and described above, it is to be understood that the above embodiments are exemplary and should not be construed as limiting the present disclosure. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present disclosure.

Claims

1. An OCA pressure-sensitive adhesive tape, characterized in that, The OCA pressure-sensitive tape includes an OCA pressure-sensitive adhesive layer, an optical light release PET layer bonded to the upper layer of the OCA pressure-sensitive adhesive layer, and an optical heavy release PET layer bonded to the lower layer of the OCA pressure-sensitive adhesive layer. The OCA pressure-sensitive tape is formed by mixing different acrylic monomers, adding a photoinitiator, coating it onto an optical heavy release PET layer, and simultaneously covering it with an optical light release PET layer. The process is UV-cured to form an OCA pressure-sensitive adhesive film.

2. The preparation process of the OCA pressure-sensitive tape according to claim 1, characterized in that, The preparation process includes the following steps: (1) By weight, 8-20.5 parts of butyl acrylate, 63.5-82 parts of isooctyl acrylate, 2.6-4.2 parts of hydroxyethyl acrylate, 3-6.3 parts of hydroxybutyl acrylate, and 1.5-4.1 parts of isobornyl acrylate are mixed with 0.07-0.1% of photoinitiator 184 and 0.05%-0.12% of molecular weight regulator dodecyl mercaptan by weight of the above monomers to form mixture 1; and 0.07-0.15% of 184, 0.08%-0.13% of 1,6-hexanediol diacrylate and 0.25-0.37% of silane coupling agent 6040 by weight of the above monomers are mixed to form mixture 2. (2) Mix mixture 1 evenly in a mixing vessel and stir for 2-4 hours. Add the mixed mixture 1 to the prepolymerization vessel, purge with nitrogen for protection, turn on UVA, control the energy at 950±150mj / cm2, stir at 40-70 rpm, and control the reaction temperature at 35-40℃; (3) After reacting for 20-30 minutes in step (2) above, stop the UV and nitrogen protection and add mixture 2, stirring for 40-60 minutes. Transfer the material in the prepolymer reactor to a vacuum chamber, evacuate to 0.4-0.8 kPa, and evacuate for 40-80 minutes; (4) The prepolymerized acrylic pressure-sensitive adhesive is coated onto the optical heavy release PET layer through the discharge channel, and the optical light release PET layer is covered on the top through the moving component and the application component; (5) The moving component drives the scraper to apply the coating, and the moving component pulls the OCA pressure-sensitive tape into the UV curing chamber for curing.

3. The OCA pressure-sensitive tape preparation process according to claim 2, characterized in that, According to step (2), the mixing component is installed on one side of the coating table. The mixing component includes a mixing tank and a prepolymer tank is provided on one side of the mixing tank. The upper end of the mixing tank is provided with a feed pipe, the bottom of the mixing tank is fixed with a conveying pipe, and the other end of the conveying pipe is fixedly connected to the top of the prepolymer tank. The bottom of the prepolymer tank is fixed with an outlet pipe. In this process, acrylic pressure-sensitive adhesive raw materials are alternately fed into the mixing tank and prepolymer tank through the feed pipe and stirred. The stirred mixture is then fed into the feeding assembly and sent out for coating.

4. The OCA pressure-sensitive tape preparation process according to claim 3, characterized in that, According to step (3), the feeding assembly includes a vacuum box, which is set at the top of the inlet end of the coating table, and the other end of the feeding tube is fixedly connected to the vacuum box. The bottom of the vacuum box is fixed with a feeding channel, and the outer surface of the vacuum box is fixed with a fixing frame. The fixing frame is fixed on both sides of the inlet end of the coating table. The inner walls of both sides of the feeding channel are fixed with protruding plates, and sliding plates are slidably connected to the protruding plates. The bottom of the sliding plates is rotatably connected to an inclined plate through a rotating shaft. The vacuum chamber is equipped with an electromagnetic valve at its outlet end, and the size of the bottom opening of the delivery channel is matched with the limiting component to keep the range of the mixture delivery within the surface of the optically released PET layer.

5. The OCA pressure-sensitive tape preparation process according to claim 4, characterized in that, The limiting component includes a limiting plate, and there are two sets of limiting plates. The two sets of limiting plates are symmetrically arranged on both sides of the coating table. A bidirectional screw is rotatably installed at the inlet end of the coating table. A drive motor is fixed at one end of the bidirectional screw on the coating table, and the output end of the drive motor is fixedly connected to the bidirectional screw. A sliding rod is fixed at the outlet end of the coating table. One end of the limiting plate is threaded onto the bidirectional screw, and the other end of the limiting plate is slidably sleeved onto the sliding rod. The bottom of the inclined plate is rotatably connected to the top of the limiting plate via a rotating shaft. When the limiting plate moves along the coating table surface as the bidirectional screw rotates, the two sets of limiting plates adjust the width of the optical release PET layer. At the same time, the inclined plate moves in the direction of the limiting plate and the direction of the mixture being delivered is towards the middle of the two limiting plates.

6. The OCA pressure-sensitive tape preparation process according to claim 5, characterized in that, According to step (4), the application assembly includes a movable frame that slides along the surface of the coating table. The top of both sides of the coating table is provided with a sliding groove, and the bottom of both sides of the movable frame slides along the inside of the sliding groove. An upper mounting seat is installed at the upper end of the movable frame. A take-up shaft is clamped between the movable frame and the upper mounting seat, and the optical light release PET layer is wound on the take-up shaft. The movable frame and the upper mounting base are connected by bolts. Under the push of the movable component, the movable frame can slide along the slide groove to apply a composite optical light release PET layer to the surface of the coated optical heavy release PET layer.

7. The OCA pressure-sensitive tape preparation process according to claim 6, characterized in that, The movable frame is slidably mounted with a sliding frame facing the feeding assembly, and two sliders are symmetrically slidably connected on the surface of the sliding frame. A first spring is fixed between the sliders and the sliding frame. A scraper is fixed at the bottom of the slider. The inner surfaces of the two scrapers are slidably connected. A pressure plate is provided on the other side of the movable frame. An adjusting screw is threaded into the top of the pressure plate, and the bottom of the adjusting screw is rotatably connected to the pressure plate. The sliding frame is fixedly connected to the pressure plate. Specifically, rotating the adjusting screw adjusts the position of the pressure plate and scraper, spreading the OCA pressure-sensitive adhesive layer evenly with a scraper, adjusting the thickness of the OCA pressure-sensitive tape for bonding the optical light release PET layer, and tightly bonding the optical light release PET layer onto the OCA pressure-sensitive adhesive layer.

8. The OCA pressure-sensitive tape preparation process according to claim 7, characterized in that, According to step (5), the moving component includes a first electric push rod, which has two sets of fixed on the outer walls of both sides of the coating table. The extended end of the first electric push rod is equipped with a clamping frame, and the top of the clamping frame is fixed with a second electric push rod. The extended end of the second electric push rod is fixed with a clamping plate, and the clamping plate and the clamping frame are clamped on both sides of the OCA pressure-sensitive adhesive tape. The OCA pressure-sensitive tape, after being cured by UV, is fed out of the coating table. The top and bottom sides of the OCA pressure-sensitive tape are clamped by the clamping frame and clamping plate. The OCA pressure-sensitive tape is moved outward by the extension end of the first electric push rod, and at the same time, the application assembly moves towards the feeding assembly.

9. The OCA pressure-sensitive tape preparation process according to claim 8, characterized in that, The first electric push rod has a telescopic plate fixed to its extended end, and the extended end of the telescopic plate is fixedly connected to the clamping frame. The limiting plate has a fixing block fixed to the side facing the telescopic plate, and the other end of the fixing block is fixedly connected to the extended end of the telescopic plate. The telescopic plate and the limiting plate are connected by the fixing block. When the position of the limiting plate is adjusted, the length of the telescopic plate is extended to keep the position of the clamping frame close to both sides of the OCA pressure-sensitive tape and to maintain the connection between the clamping frame and the first electric push rod.

10. The OCA pressure-sensitive tape preparation process according to claim 9, characterized in that: The extended end of the first electric push rod is fixed with a first toothed plate, and a gear is rotatably installed on the middle outer wall of the coating table. The gear meshes with the first toothed plate, and a second toothed plate meshes with the top of the gear. The second toothed plate is fixedly connected to the movable frame. When the first electric push rod extends and pulls the OCA pressure-sensitive tape, the first toothed plate meshes with the gear, and the gear meshes with the second toothed plate, causing the first toothed plate and the second toothed plate to move in opposite directions. The second toothed plate drives the moving frame to move along the surface of the coating table to apply and flatten the OCA pressure-sensitive tape.

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