Preparation process and device of cross-linked modified acrylic pressure-sensitive adhesive

Abstract

The present invention relates to the technical field of pressure-sensitive adhesives, and in particular to a preparation process and device for a cross-linked modified acrylate pressure-sensitive adhesive, comprising the following steps: S1, pressure-sensitive adhesive formula materials and composition percentages, S2, acrylate polymer material mass fraction composition, S3, acrylate polymer soft and hard monomer ratios, S4, acrylate polymer configuration, S5, preparation of a cross-linked modified acid ester pressure-sensitive adhesive, S6, UV light irradiation of a PET film, comprising a base, a conveying portion, a housing and a cooling block are installed on the top of the base, a PET film coated with a pressure-sensitive adhesive is placed on the conveying portion, and the housing and the cooling block are both covered on the conveying portion. The present invention can avoid the oxygen inhibition phenomenon when the pressure-sensitive adhesive on the PET film is cured, thereby effectively ensuring the curing effect of the pressure-sensitive adhesive, and can prevent the pressure-sensitive adhesive from being over-cured or incompletely cured during the curing process due to the uneven distribution of the photoinitiator thereon.

Description

Technical Field

[0001] The invention relates to the technical field of pressure-sensitive adhesives, in particular to a preparation process and a device for a cross-linked modified acrylate pressure-sensitive adhesive. Background Art

[0002] Cross-linked modified acrylic pressure-sensitive adhesive is an acrylic resin obtained by free radical polymerization. After the action of a cross-linking agent, chemical bonds are formed between the molecular chains, thereby increasing its adhesion, chemical resistance, heat resistance and other properties. This type of pressure-sensitive adhesive usually has good low-temperature and high-temperature resistance, low condensable volatiles and mass loss rate, and no harmful gas escape. In order to improve the adhesion, chemical resistance, heat resistance and other properties of the pressure-sensitive adhesive, its curing is very important.

[0003] Most of the existing curing methods for pressure-sensitive adhesives are through UV light irradiation, but this curing method has some problems. First, a heating effect will be generated during the illumination process, and the oxygen in the air will inhibit the free radical reaction during the curing process of the pressure-sensitive adhesive at high temperature, resulting in oxygen inhibition on the surface of the pressure-sensitive adhesive when the UV light is used to cure the pressure-sensitive adhesive. This phenomenon will cause the surface of the pressure-sensitive adhesive to become sticky, that is, incomplete curing, thereby reducing the curing effect of the pressure-sensitive adhesive. Secondly, the curing effect of the pressure-sensitive adhesive depends not only on the uniformity of the illumination, but also on the uniformity of the distribution of the photoinitiator. If the distribution of the photoinitiator in the pressure-sensitive adhesive is uneven, under UV light of the same wavelength and intensity, the area with a higher concentration of the photoinitiator will absorb more light energy and produce more free radicals, thereby accelerating the curing speed of the area and even possibly causing over-curing. On the contrary, the area with a lower concentration of the photoinitiator may not be able to fully excite the free radical reaction due to insufficient light energy, resulting in incomplete curing, thereby greatly reducing the curing effect of the pressure-sensitive adhesive and poor practicality. Summary of the invention

[0004] The purpose of the present invention is to solve the problem that when the pressure-sensitive adhesive is cured by UV light in the prior art, oxygen inhibition occurs easily due to the temperature rise effect, and the pressure-sensitive adhesive is over-cured or incompletely cured due to the uneven distribution of photoinitiators in the pressure-sensitive adhesive, thereby reducing the curing effect of the pressure-sensitive adhesive. A preparation process and device for a cross-linked modified acrylate pressure-sensitive adhesive are proposed.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions: The preparation process of the cross-linked modified acrylic pressure-sensitive adhesive comprises the following steps: S1. The pressure-sensitive adhesive formula material and the composition percentage are 80% to 90% of acrylate polymer, 1% to 3% of the second photoinitiator, and 4% to 12% of the crosslinking agent; S2. The acrylate polymer is composed of the following materials by mass: 80 to 90 parts of soft monomer, 6 to 10 parts of hard monomer, 10 to 20 parts of functional monomer, and 0.1 to 0.3 parts of the first photoinitiator; S3, the soft monomer is isooctyl acrylate, the hard monomer is styrene, the functional monomer is hydroxyethyl acrylate, the first photoinitiator is diphenyl-(2,4,6-trimethylbenzoyl)phosphine oxide, the second photoinitiator is 2-hydroxy-2-methyl-1-phenyl-1-propanone, and the crosslinking agent is epoxy acrylate UV resin, wherein the ratio of soft and hard monomers of acrylate polymer is: isooctyl acrylate: styrene = 83:7, and the amount of hydroxyethyl acrylate is 12.5%; S4. Prepare acrylate polymer: add acrylate monomer mixture and the first photoinitiator into a beaker with a magnetic stirring device, the acrylate monomer mixture is a mixture of soft monomer, hard monomer and functional monomer in the acrylate polymer, stir evenly in the above beaker, irradiate with ultraviolet light source, turn off the light source and continue stirring for 10 minutes, cool to room temperature to obtain acrylate polymer; S5. Prepare cross-linked modified acid ester pressure-sensitive adhesive: add the second photoinitiator and the cross-linking agent to the prepared acrylate polymer, mix evenly, apply it on the polyethylene terephthalate film with a wire rod coater, degas, and cover the PET film coated with the mixture with a release film; S6. Irradiate the PET film with UV light in the curing device to obtain a PSA film.

[0006] The preparation device of cross-linked modified acrylic pressure-sensitive adhesive is applied to the above-mentioned preparation process, comprising a base, a conveying part, a shell and a cooling block are installed on the top of the base, a PET film coated with a pressure-sensitive adhesive is placed on the conveying part, the shell and the cooling block are both covered on the conveying part, and the shell and the cooling block are connected to each other, the connection between the shell and the cooling block is through-set, the end of the shell away from the cooling block and one side of the cooling block are penetrated with openings for the conveying part to pass through, and the end of the shell close to the cooling block and the top of the cooling block are jointly installed with a storage shell, and also includes: A light curing mechanism, which is disposed in the housing and is used for UV curing the PET film coated with the pressure-sensitive adhesive; A gas injection mechanism, which is arranged on the housing and the cooling block and is used to fill the interior of the housing with nitrogen; The curing control mechanism comprises a detection component and two groups of slide grooves, the two groups of slide grooves are symmetrically arranged on two groups of inner side walls of the outer shell, and two groups of sliding shells are slidably connected in the two groups of slide grooves, the two groups of sliding shells are located below the light curing mechanism, and the two groups of sliding shells are located between the detection component and the cooling block, the detection component is arranged in the outer shell, and is used to judge the distribution of the photoinitiator in the pressure-sensitive adhesive coated on the PET film, and the two groups of slide grooves and the two groups of sliding shells are jointly provided with a driving component, which is used to make the two groups of sliding shells realize in the slide groove The two groups of sliding shells are arranged inside with cavities, the two groups of cavities are rotatably connected with rotating rollers, the two groups of rotating rollers are connected with the inner wall of the cavity with torsion springs, the two groups of sliding shells are arranged on opposite sides with two groups of through grooves, the two groups of cavities are connected with the outside world through the two groups of through grooves, and light-transmitting films are inserted in the two groups of through grooves, the two ends of the light-transmitting films are respectively wound around the two groups of rotating rollers, and the two groups of sliding shells are provided with fill light components for compensating light for the area on the PET film coated with pressure-sensitive adhesive and blocked by the sliding shell.

[0007] Preferably, the light curing mechanism comprises two groups of grooves, which are symmetrically arranged on two groups of inner side walls of the outer shell, and a curing light source is inserted into the two groups of grooves. A cooling component is arranged in the outer shell for cooling the curing light source.

[0008] Preferably, the cooling component includes a heat sink and two groups of semiconductor cooling fins, the heat sink is inserted into the two groups of grooves, and the top of the heat sink is in contact with the curing light source, the two groups of semiconductor cooling fins are respectively sealed and installed on the inner walls of the two groups of grooves, and the two groups of semiconductor cooling fins are in contact with the heat sink, and two groups of heat dissipation grooves are opened through the outer shell, the two groups of heat dissipation grooves are respectively connected with the inside of the two groups of grooves, the two groups of semiconductor cooling fins are respectively located at the positions where the two groups of heat dissipation grooves are connected with the two groups of grooves, and fans are installed in the two groups of heat dissipation grooves.

[0009] Preferably, the gas injection mechanism includes a nitrogen nozzle, an atmosphere pipe and multiple groups of cooling air outlet heads. The nitrogen nozzle is fixedly installed at one end of the outer shell, and the nitrogen nozzle is located at the opening of the outer shell. The atmosphere pipe is fixedly installed in the middle position of the outer shell. The multiple groups of cooling air outlet heads are evenly rotated and connected to the inner top wall of the opening on the cooling block. The nitrogen nozzle, atmosphere pipe and cooling block are all connected to the external gas storage device.

[0010] Preferably, the detection component includes a test block, which is fixedly mounted on the inner wall of the outer shell, and a heat sensor and an ultraviolet emitter are respectively mounted on the bottom end of the test block, the ultraviolet emitter is inclined toward the heat sensor, and the ultraviolet wavelength on the ultraviolet emitter is 254nm or 365nm.

[0011] Preferably, the driving component includes two groups of racks, and the two groups of racks are symmetrically installed on the inner walls of the two groups of slide grooves near the top positions, gears are installed at both ends of the two groups of sliding shells, and built-in motors are installed inside the two groups of sliding shells to drive the two groups of gears thereon to rotate, and the two groups of gears on the two groups of sliding shells are respectively meshed with the two groups of racks.

[0012] Preferably, the fill light assembly includes an ultraviolet sensor and a mounting groove, the ultraviolet sensor is fixedly mounted on the top of the sliding shell, the mounting groove is opened at the bottom of the sliding shell, and a rotating plate is rotatably connected in the mounting groove, a compensation light source is installed at the bottom end of the rotating plate, and a rotating groove for the rotating plate to rotate is opened on the top wall of the mounting groove.

[0013] Preferably, an ultraviolet absorber is arranged in the light-transmitting film, and the inner walls of the two groups of cavities near the through grooves are rotatably connected with smoothing rollers, and the outer walls of the smoothing rollers in the two groups of cavities are in contact with the top of the light-transmitting film.

[0014] Preferably, it also includes a coating mechanism, which includes a rotating chamber and two groups of lifting rods, the rotating chamber is opened inside the storage shell, and a through opening is penetrated at the bottom end of the rotating chamber, a winding roller is rotatably connected in the rotating chamber, a protective film is wound around the winding roller, and the end of the protective film away from the winding roller is located at the through opening, the two groups of lifting rods are symmetrically installed at the bottom end of the storage shell, and the two groups of lifting rods are located on the outward side of the cooling block, the output ends of the two groups of lifting rods are installed with connecting blocks, and the two groups of connecting blocks are rotatably connected with lifting and pressing rollers.

[0015] Compared with the prior art, the advantages of the present invention are: 1. The present invention can make the pressure-sensitive adhesive on the PET film UV-cured in a relatively stable nitrogen protective gas environment through the cooperation of the light curing mechanism and the gas injection mechanism, thereby blocking the direct contact between the external oxygen and the pressure-sensitive adhesive, avoiding the oxygen inhibition phenomenon during the curing of the pressure-sensitive adhesive, that is, avoiding the incomplete curing of the pressure-sensitive adhesive during the curing, thereby effectively ensuring the curing effect of the pressure-sensitive adhesive, and through the setting of the curing control mechanism, the setting of the internal detection component can be used to judge the distribution of the photoinitiator on the pressure-sensitive adhesive, and when it is judged that the photoinitiator on the pressure-sensitive adhesive is unevenly distributed, the light-transmitting film shielding measures and the light compensation operation of the ultraviolet sensor and the compensation light source can be used to prevent the pressure-sensitive adhesive from being over-cured or incompletely cured during the curing process due to the uneven distribution of the photoinitiator on the pressure-sensitive adhesive, thereby further ensuring the curing effect of the pressure-sensitive adhesive on the PET film.

[0016] 2. Through the setting of the gas injection mechanism, the present invention can, before the curing operation of the pressure-sensitive adhesive on the PET film, use the nitrogen injected into the shell by the atmosphere tube and the nitrogen blown out by the nitrogen nozzle and the cooling air outlet to prevent external oxygen and humid air from entering the shell through the openings on the shell and the openings on the cooling block, and at the same time fill the shell with nitrogen, thereby ensuring that a relatively stable nitrogen protective gas environment is always maintained inside the shell, effectively avoiding the influence of external oxygen on the UV irradiation curing process of the pressure-sensitive adhesive, thereby effectively ensuring the curing effect of the pressure-sensitive adhesive.

[0017] 3. The present invention can quickly cool down the PET film when passing through the cooling block, that is, directly and quickly cool down the cured pressure-sensitive adhesive, through the arrangement of the cooling block and the cooling air outlet in the air injection mechanism, thereby avoiding the problems of performance degradation or deformation of the pressure-sensitive adhesive due to excessive temperature, and because a plurality of groups of cooling air outlets are rotatably connected to the cooling block, the blowing direction and range of the cold air (nitrogen) can be adjusted by adjusting the deflection angle of the cooling air outlet, so that the cold air can cover the surface of the pressure-sensitive adhesive more evenly, thereby effectively improving the cooling efficiency of the cured pressure-sensitive adhesive.

[0018] 4. The present invention can cool the curing light source by setting a cooling component in the light curing mechanism and utilizing the settings of a semiconductor refrigeration sheet and a heat sink, thereby preventing the performance of the curing light source from being degraded or damaged due to the high temperature accumulated during continuous operation, thereby effectively improving the service life of the curing light source. In addition, by utilizing the heat sink and the fan in the heat sink, the heat generated by the hot end of the semiconductor refrigeration sheet can be taken away and discharged, thereby ensuring that the semiconductor refrigeration sheet can work continuously and efficiently, thereby ensuring the stable operation of the curing light source.

[0019] 5. The present invention can indirectly judge the distribution of the photoinitiator on the pressure-sensitive adhesive by setting a detection component in the curing control mechanism, utilizing the ultraviolet emitter to irradiate the pressure-sensitive adhesive on the PET film and the thermal sensor to detect the temperature fluctuation of the irradiated pressure-sensitive adhesive in real time. Since the ultraviolet emitter can emit ultraviolet rays of a specific wavelength, and ultraviolet rays of a specific wavelength (i.e., ultraviolet rays with a wavelength of 254nm or 365nm) can more effectively excite the photoinitiator in the pressure-sensitive adhesive, thereby accelerating the chemical reaction of the photoinitiator, and further more efficiently judging the distribution of the photoinitiator on the pressure-sensitive adhesive.

[0020] 6. The present invention, through the setting of the laminating mechanism, can utilize the bonding of the protective film with the pressure-sensitive adhesive that has been solidified and cooled on the PET film and the downward pressure of the lifting and lowering pressure rollers to complete the lamination of the surface of the PET film, thereby ensuring that the pressure-sensitive adhesive layer on the PET film is not corroded by the external environment, thereby effectively extending the service life of the pressure-sensitive adhesive and maintaining its good performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 The overall structural diagram of the preparation device in the preparation process and device of the cross-linked modified acrylate pressure-sensitive adhesive proposed by the present invention; Figure 2 This is a schematic structural diagram of another perspective of the device for preparing the cross-linked modified acrylate pressure-sensitive adhesive proposed by the present invention; Figure 3 This is a schematic structural diagram of the heat dissipation tank portion of the preparation device for the cross-linked modified acrylate pressure-sensitive adhesive proposed by the present invention; Figure 4 This is a schematic diagram of the structure inside the shell of the preparation device for the cross-linked modified acrylate pressure-sensitive adhesive proposed by the present invention; Figure 5 This is a schematic diagram of the internal structure of the device for preparing the cross-linked modified acrylate pressure-sensitive adhesive proposed by the present invention; Figure 6 This is a schematic structural diagram of the curing light source part of the preparation device for the cross-linked modified acrylate pressure-sensitive adhesive proposed by the present invention; Figure 7 This is a schematic diagram of the structure inside the sliding shell of the preparation device for the cross-linked modified acrylic pressure-sensitive adhesive proposed by the present invention; Figure 8 This is a schematic structural diagram of a test block of a preparation device for a cross-linked modified acrylate pressure-sensitive adhesive proposed in the present invention; Fig. 9 This is a schematic structural diagram of a cooling block of a device for preparing a cross-linked modified acrylate pressure-sensitive adhesive proposed in the present invention; Fig.10 This is a schematic structural diagram of a storage shell of a preparation device for the cross-linked modified acrylate pressure-sensitive adhesive proposed in the present invention.

[0022] In the figure: 1. base; 2. conveying part; 3. shell; 301. heat sink; 4. semiconductor cooling plate; 5. fan; 6. test block; 7. heat sensor; 8. ultraviolet emitter; 9. nitrogen nozzle; 10. atmosphere pipe; 11. heat sink; 12. curing light source; 13. slide groove; 131. rack; 14. sliding shell; 141. gear; 15. light-transmitting film; 16. rotating groove; 17. rotating plate; 18. compensation light source; 19. ultraviolet sensor; 20. cooling block; 21. cooling air outlet; 22. storage shell; 23. lifting and lowering roller. DETAILED DESCRIPTION

[0023] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0024] The preparation process of the cross-linked modified acrylic pressure-sensitive adhesive comprises the following steps: S1. The formula materials and composition percentage of the pressure-sensitive adhesive are 85% acrylate polymer, 3% second photoinitiator, and 12% cross-linking agent; S2. The acrylate polymer is composed of the following materials by mass: 80 parts of soft monomer, 6 parts of hard monomer, 10 parts of functional monomer, and 0.1 parts of the first photoinitiator; S3. The soft monomer is isooctyl acrylate, the hard monomer is styrene, the functional monomer is hydroxyethyl acrylate, the first photoinitiator is diphenyl-(2,4,6-trimethylbenzoyl)phosphine oxide (TPO), the second photoinitiator is 2-hydroxy-2-methyl-1-phenyl-1-propanone (photoinitiator 1173), and the cross-linking agent is epoxy acrylate UV resin, wherein the ratio of soft and hard monomers of the acrylate polymer is: isooctyl acrylate: styrene = 83:7, and the amount of hydroxyethyl acrylate is 12.5%; S4. Prepare the acrylate polymer: add the acrylate monomer mixture and the first photoinitiator into a beaker with a magnetic stirring device, and the acrylate monomer The mixture is a mixture of soft monomers, hard monomers and functional monomers in the acrylate polymer. After being stirred evenly in the above beaker, it is irradiated with an ultraviolet light source (395nm). After turning off the light source, stirring is continued for 10 minutes, and the acrylate polymer is obtained after cooling to room temperature; S5. Preparation of cross-linked modified acid ester pressure-sensitive adhesive: Add a second photoinitiator and a cross-linking agent to the prepared acrylate polymer, mix evenly, and then apply it on a polyethylene terephthalate (PET) film with a wire rod coater, perform a degassing operation, and cover the PET film coated with the mixture with a release film; S6. The PET film is irradiated with UV light in a curing device to obtain a PSA film.

[0025] Reference Figures 1 to 6, a preparation device for a cross-linked modified acrylic pressure-sensitive adhesive, which is applied to the curing work of step S6 in the preparation process of the above-mentioned cross-linked modified acrylic pressure-sensitive adhesive, comprises a base 1, a conveying part 2, a shell 3 and a cooling block 20 are installed on the top of the base 1, the conveying part 2 is a prior art, and its specific structural design is not repeated here, a PET film coated with a pressure-sensitive adhesive is placed on the conveying part 2, the shell 3 and the cooling block 20 are both covered on the conveying part 2, and the shell 3 and the cooling block 20 are connected to each other, the connection between the shell 3 and the cooling block 20 is through-set, an end of the shell 3 away from the cooling block 20 and one side of the cooling block 20 are penetrated with an opening for the conveying part 2 to pass through, and a storage shell 22 is installed on the end of the shell 3 close to the cooling block 20 and the top of the cooling block 20, and a light curing mechanism is arranged in the shell 3 for curing the PET film coated with the pressure-sensitive adhesive UV light curing is performed, and the light curing mechanism includes two groups of grooves, and the two groups of grooves are symmetrically opened on the two groups of inner walls on the outer shell 3, and a curing light source 12 is inserted in the two groups of grooves. A cooling component is arranged in the outer shell 3 for cooling the curing light source 12. The cooling component includes a heat sink 11 and two groups of semiconductor cooling plates 4. The heat sink 11 is inserted in the two groups of grooves, and the top of the heat sink 11 is in contact with the curing light source 12. The two groups of semiconductor cooling plates 4 are sealed and installed on the inner walls of the two groups of grooves, and the two groups of semiconductor cooling plates 4 are in contact with the heat sink 11. Two groups of heat dissipation grooves 301 are opened through the outer shell 3, and the two groups of heat dissipation grooves 301 are respectively connected with the inside of the two groups of grooves. The two groups of semiconductor cooling plates 4 are respectively located at the positions where the two groups of heat dissipation grooves 301 are connected with the two groups of grooves, and fans 5 are installed in the two groups of heat dissipation grooves 301.

[0026] Reference Figures 1 to 5 as well as Fig. 9 The outer shell 3 and the cooling block 20 are jointly provided with a gas injection mechanism for filling the inner part of the outer shell 3 with nitrogen. The gas injection mechanism includes a nitrogen nozzle 9, an atmosphere pipe 10 and a plurality of cooling air outlet heads 21. The nitrogen nozzle 9 is fixedly installed at one end of the outer shell 3, and the nitrogen nozzle 9 is located at the opening of the outer shell 3. The atmosphere pipe 10 is fixedly installed at the middle position of the outer shell 3. The plurality of cooling air outlet heads 21 are evenly rotated and connected to the inner top wall of the opening on the cooling block 20. The nitrogen nozzle 9, the atmosphere pipe 10 and the cooling block 20 are all connected to an external gas storage device.

[0027] Before the curing operation is performed, nitrogen is continuously injected into the shell 3 through the atmosphere pipe 10 until the shell 3 is completely filled. While nitrogen is injected into the shell 3 through the atmosphere pipe 10, the nitrogen nozzle 9 and the cooling air outlet 21 on the cooling block 20 also blow nitrogen, so that external oxygen and humid air cannot enter the shell 3 through the openings on the shell 3 and the openings on the cooling block 20. When the shell 3 is filled with nitrogen, the PET film coated with the pressure-sensitive adhesive is placed on the conveying part 2 from the side of the shell 3 where the nitrogen nozzle 9 is installed, and the conveying part 2 is started to convey the PET film coated with the pressure-sensitive adhesive into the shell 3, and then the pressure-sensitive adhesive on the PET film is cured by irradiation with the curing light source 12 inside the shell 3. During the delivery and curing process, the nitrogen nozzle 9 and the cooling air outlet 21 are in a continuous working state. The purpose of this is to ensure that a relatively stable nitrogen protective gas environment is always maintained inside the shell 3, thereby effectively avoiding the influence of external oxygen on the curing process of the pressure-sensitive adhesive. Specifically, when the pressure-sensitive adhesive is cured by ultraviolet irradiation (i.e., UV irradiation) of the curing light source 12, a heating effect will be produced, and the oxygen in the air will inhibit the free radical reaction during the curing process of the pressure-sensitive adhesive at high temperatures, thereby causing incomplete curing of the pressure-sensitive adhesive. By filling the shell 3 with nitrogen and maintaining this environment continuously, direct contact between external oxygen and the pressure-sensitive adhesive can be blocked, thereby avoiding the occurrence of the above-mentioned adverse reactions, thereby effectively ensuring the curing effect of the pressure-sensitive adhesive.

[0028] After the pressure-sensitive adhesive is completely cured, the PET film will be transported out from the opening of the cooling block 20. Under the action of the cooling block 20, the nitrogen blown out by the multiple groups of cooling air outlets 21 is cold air, which can quickly cool down the PET film when passing through the cooling block 20, that is, directly cool down the cured pressure-sensitive adhesive quickly, thereby avoiding problems such as performance degradation or deformation of the pressure-sensitive adhesive due to excessive temperature. Moreover, since the multiple groups of cooling air outlets 21 are rotatably connected to the cooling block 20, the blowing direction and range of the cold air (nitrogen) can be adjusted by adjusting the deflection angle of the cooling air outlet 21, so that the cold air can cover the surface of the pressure-sensitive adhesive more evenly, thereby effectively improving the cooling efficiency of the cured pressure-sensitive adhesive.

[0029] When the pressure-sensitive adhesive on the PET film is exposed to ultraviolet light (i.e., UV irradiation), the photoinitiator in the pressure-sensitive adhesive will generate active free radicals or ion radicals after absorbing light energy. These active free radicals or ion radicals further initiate chemical reactions such as polymerization and cross-linking between monomers, so that the pressure-sensitive adhesive is converted from liquid to solid in a short time. In this process, the curing light source 12 inside the housing 3 can be flexibly adjusted to an appropriate light intensity according to the specific curing requirements of the pressure-sensitive adhesive on the PET film. During the operation of the curing light source 12, the semiconductor refrigeration sheet 4 will also start to work, and it will fully cool the heat sink 11 that is in full contact with the curing light source 12, thereby indirectly curing the The light source 12 is cooled down, thereby preventing the performance of the curing light source 12 from being degraded or damaged due to the high temperature accumulated during continuous operation, thereby effectively improving the service life of the curing light source 12. At this time, the fan 5 in the heat dissipation slot 301 is in an on state. In the on state, the fan 5 can drive the air inside the heat dissipation slot 301 to flow continuously. Since the two groups of semiconductor cooling plates 4 are respectively located at the connecting positions of the two groups of heat dissipation slots 301 and the two groups of grooves, the heat generated by the hot end of the semiconductor cooling plate 4 will be taken away and discharged by the air continuously flowing inside the heat dissipation slot 301, thereby ensuring that the semiconductor cooling plate 4 can work continuously and efficiently, thereby ensuring the stable operation of the curing light source 12.

[0030] Reference Figures 1 to 8 A curing regulating mechanism is arranged inside the shell 3 to avoid the problem of over-curing or incomplete curing of the pressure-sensitive adhesive on the PET film. The curing regulating mechanism includes a detection component and two groups of slide grooves 13. The two groups of slide grooves 13 are symmetrically arranged on two groups of inner side walls on the shell 3, and two groups of sliding shells 14 are slidably connected in the two groups of slide grooves 13. The two groups of sliding shells 14 are located below the light curing mechanism, and the two groups of sliding shells 14 are located between the detection component and the cooling block 20. The detection component is arranged in the shell 3 to determine the distribution of the photoinitiator in the pressure-sensitive adhesive coated on the PET film. The detection component includes a test block 6, which is fixedly mounted on the inner side wall of the shell 3, and a heat sensor 7 and an ultraviolet emitter 8 are respectively mounted on the bottom end of the test block 6. The ultraviolet emitter 8 is inclined toward the heat sensor 7, and the ultraviolet wavelength on the ultraviolet emitter 8 is 254nm or 365nm.

[0031] Since the curing effect of the pressure-sensitive adhesive depends on the photoinitiator promoting the reaction of the photoinitiator and the cross-linking agent under the action of ultraviolet light (UV) of a specific wavelength, the curing uniformity of the pressure-sensitive adhesive is not only related to the uniformity of light, but also to the uniformity of the distribution of the photoinitiator in the pressure-sensitive adhesive during the coating process. If the distribution of the photoinitiator in the pressure-sensitive adhesive coating process is uneven, then under UV light of the same wavelength and intensity, the pressure-sensitive adhesive may be over-cured and incompletely cured, thereby reducing the curing effect of the pressure-sensitive adhesive.

[0032] At the same time, during the UV light curing process of the pressure-sensitive adhesive, ultraviolet rays of a specific wavelength can contact the photoinitiator inside the pressure-sensitive adhesive, and quickly promote chemical reactions, and cause the temperature of the pressure-sensitive adhesive to change. Therefore, when the PET film enters the housing 3 through the conveying portion 2 and passes through the bottom of the test block 6, the ultraviolet emitter 8 at the bottom of the test block 6 will emit concentrated ultraviolet rays of a specific wavelength to evenly irradiate the pressure-sensitive adhesive. At this time, the heat sensor 7 at the bottom of the test block 6 can detect the temperature fluctuations of the pressure-sensitive adhesive in real time, thereby indirectly judging the distribution of the photoinitiator on the pressure-sensitive adhesive. Usually, the wavelength range of ultraviolet rays used for UV light curing is between 200nm and 450nm, and ultraviolet rays of a specific wavelength (i.e., ultraviolet rays with a wavelength of 254nm or 365nm) can more effectively excite the photoinitiator in the pressure-sensitive adhesive, thereby accelerating the chemical reaction of the photoinitiator, and further more efficiently judging the distribution of the photoinitiator on the pressure-sensitive adhesive.

[0033] Reference Figures 4 to 7 The two sets of slide grooves 13 and the two sets of sliding shells 14 are jointly provided with a driving assembly for moving the two sets of sliding shells 14 in the slide grooves 13. The driving components include two sets of racks 131, which are symmetrically mounted on the inner walls of the two sets of slide grooves 13 near the top positions. Gears 141 are installed at both ends of the two sets of sliding shells 14, and built-in motors are installed inside the two sets of sliding shells 14 to drive the two sets of gears 141 thereon to rotate. The two sets of gears 141 on the two sets of sliding shells 14 are 41 are respectively meshed with two sets of racks 131, two sets of sliding shells 14 are provided with cavities inside, rotating rollers are rotatably connected in the two sets of cavities, torsion springs are installed at the connection between the two sets of rotating rollers and the inner wall of the cavity, two sets of through grooves are provided on the opposite sides of the two sets of sliding shells 14, the two sets of cavities are connected with the outside through the two sets of through grooves, and a light-transmitting film 15 is inserted in the two sets of through grooves, and the two ends of the light-transmitting film 15 are respectively wound around the two sets of rotating rollers, and an ultraviolet absorber is arranged in the light-transmitting film 15. The inner walls of the two groups of cavities are rotatably connected with smoothing rollers near the through grooves, and the outer walls of the smoothing rollers in the two groups of cavities are in contact with the top of the light-transmitting film 15. The smoothing rollers are used to flatten the light-transmitting film 15 (i.e., the light-transmitting film 15 when unfolded or retracted) during the rotation of the two groups of rotating rollers, thereby ensuring that the surface of the light-transmitting film 15 is flat and wrinkle-free, effectively ensuring the light transmittance of the light-transmitting film 15. The two groups of sliding shells 14 are provided with fill-light components, which are used to compensate for light in the area where the pressure-sensitive adhesive is coated on the PET film and blocked by the sliding shell 14, thereby ensuring that the area blocked by the sliding shell 14 can also have a suitable light intensity. The fill-light component includes an ultraviolet sensor 19 and a mounting groove. The ultraviolet sensor 19 is fixedly installed on the top of the sliding shell 14, and the mounting groove is opened at the bottom of the sliding shell 14. A rotating plate 17 is rotatably connected in the mounting groove, and a compensation light source 18 is installed at the bottom of the rotating plate 17. A rotating groove 16 for the rotating plate 17 to rotate is opened on the top wall of the mounting groove.

[0034] When the thermal sensor 7 detects that the temperature change amplitude of some areas of the pressure-sensitive adhesive on the PET film is lower than the normal range of other areas, this usually means that the photoinitiator distribution in the area with a smaller temperature change amplitude is less. If it continues to be cured with the current intensity of the curing light source 12, the area may be over-cured due to excessive ultraviolet rays. If the intensity of the entire curing light source 12 is adjusted, it may cause incomplete curing of other areas of the pressure-sensitive adhesive. Therefore, at this time, the built-in motor inside the sliding shell 14 can be turned on to rotate the gear 141 on the sliding shell 14. Since the gear 141 is engaged with the rack 131 installed in the slide groove 13, the two groups of sliding shells 14 can move in the slide groove 13.

[0035] At this time, the two groups of sliding shells 14 are controlled to move in opposite directions, so that the light-transmitting film 15 rolled up by the rotating rollers inside the two groups of sliding shells 14 can open a corresponding width according to the size of the area with less photoinitiator distribution on the pressure-sensitive adhesive, and then move to a suitable position under the synergistic effect of the two groups of sliding shells 14, so that the light-transmitting film 15 can block the area with less photoinitiator, and as the PET film moves during the curing process, the two groups of sliding shells 14 will also drive the light-transmitting film 15 to move accordingly, so that the light-transmitting film 15 always blocks the area with less photoinitiator, and then the light-transmitting film 15 can effectively reduce the pressure-sensitive adhesive with less photoinitiator. The intensity of ultraviolet radiation to the area with less photoinitiator effectively ensures that the above-mentioned area will not be over-cured due to excessive ultraviolet rays. Since the ultraviolet absorber is arranged in the light-transmitting film 15, the ultraviolet protection performance of the light-transmitting film 15 can be improved, and the light-transmitting film 15 can significantly weaken the ultraviolet light of a specific band (mainly UVA), and finally further ensure that the area with less photoinitiator will not be over-cured due to excessive ultraviolet rays. Since a torsion spring is installed at the connection between the rotating roller in the sliding shell 14 and the inner wall of the cavity, if the light-transmitting film 15 needs to return to the previous winding state later, it is only necessary to control the two sets of sliding shells 14 to move toward each other.

[0036] Due to the existence of the two sets of sliding shells 14, part of the area on the pressure-sensitive adhesive will be completely blocked, which will affect the normal curing of the completely blocked area. At this time, the ultraviolet sensor 19 on the top of the sliding shell 14 detects the ultraviolet radiation intensity from the curing light source 12 on the completely blocked area, and then controls the rotating plate 17 inside the rotating groove 16 to rotate to a suitable angle, and controls the compensation light source 18 to be connected to a suitable amount of electricity, so as to ensure that the area blocked by the sliding shell 14 can also have a suitable ultraviolet radiation intensity. The tilt of the rotating plate 17 can ensure that the compensation light source 18 has as little impact as possible on the UV light curing of the area blocked by the light-transmitting film 15.

[0037] When the thermal sensor 7 detects that the temperature variation of some areas of the pressure-sensitive adhesive on the PET film is higher than the normal range of other areas, this usually means that the area with a larger temperature variation has more photoinitiators distributed. If the area continues to be cured with the current intensity of the curing light source 12, the area may be incompletely cured due to weak ultraviolet rays. At this time, the intensity of the curing light source 12 is increased to ensure that it matches the area with more photoinitiators distributed, thereby avoiding the problem of incomplete curing in the area with more photoinitiators distributed on the pressure-sensitive adhesive. At the same time, under such ultraviolet irradiation intensity, the remaining areas of the pressure-sensitive adhesive are prone to over-curing. Therefore, it is only necessary to adopt the previously mentioned shielding measures through the light-transmitting film 15 to weaken the intensity of ultraviolet radiation and to compensate the light for the area blocked by the sliding shell 14 through the ultraviolet sensor 19 and the compensation light source 18. If the area with more photoinitiator distribution is located in the middle area of ​​the PET film, it is only necessary to add the above-mentioned related structure for shielding and weakening the intensity of ultraviolet radiation. In this way, even if the photoinitiator distribution on the pressure-sensitive adhesive of the PET film is uneven, it can avoid the problem of over-curing or incomplete curing during the curing process, thereby effectively ensuring the curing effect of the pressure-sensitive adhesive on the PET film.

[0038] Reference Figure 1 , Figure 2 , Figure 5 and Fig.10 A coating mechanism is provided on the storage shell 22 for coating the surface of the PET film coated with the pressure-sensitive adhesive and cured. The coating can be used as an additional protective process to ensure that the pressure-sensitive adhesive layer on the PET film is not corroded by the external environment, thereby extending the service life of the pressure-sensitive adhesive and maintaining its good performance. The coating mechanism includes a rotating chamber and two sets of lifting rods. The rotating chamber is opened inside the storage shell 22, and a through opening is provided at the bottom end of the rotating chamber. A winding roller is rotatably connected in the rotating chamber, and a protective film is wound on the winding roller. One end of the protective film away from the winding roller is located at the through opening. The two sets of lifting rods are symmetrically installed at the bottom end of the storage shell 22, and the two sets of lifting rods are located on the outward side of the cooling block 20. Connecting blocks are installed at the output ends of the two sets of lifting rods, and the two sets of connecting blocks are rotatably connected with a lifting and lowering pressure roller 23.

[0039] If it is necessary to coat the surface of the PET film coated with pressure-sensitive adhesive and cured, just pull out the protective film in the rotating cavity through the opening and stick it to the surface of the pressure-sensitive adhesive on the PET film that has been cured and cooled. Then, open the lifting rod to move the connecting block and the lifting and pressing roller 23 on the connecting block downward until the lifting and pressing roller 23 is pressed down to the surface of the protective film and the protective film is tightly fitted to the PET film.

[0040] In the present invention, before the curing operation is performed, nitrogen is first continuously injected into the shell 3 through the atmosphere pipe 10 until the shell 3 is completely filled. While nitrogen is injected into the shell 3 through the atmosphere pipe 10, the nitrogen nozzle 9 and the cooling air outlet 21 on the cooling block 20 also blow out nitrogen, so that external oxygen and humid air cannot enter the shell 3 through the openings on the shell 3 and the openings on the cooling block 20. When the shell 3 is filled with nitrogen, the PET film coated with the pressure-sensitive adhesive is placed on the conveying part 2 from the side of the shell 3 where the nitrogen nozzle 9 is installed, and the conveying part 2 is started to convey the PET film coated with the pressure-sensitive adhesive into the shell 3, and then the pressure-sensitive adhesive on the PET film is cured by irradiation of the curing light source 12 inside the shell 3. During the entire conveying and curing process, the nitrogen nozzle 9 and the cooling air outlet 21 are in a continuous working state. The purpose of this is to ensure that a relatively stable nitrogen protective gas environment is always maintained inside the shell 3, thereby effectively preventing external oxygen from affecting the curing process of the pressure-sensitive adhesive. Specifically, when the pressure-sensitive adhesive is cured by ultraviolet radiation (i.e., UV radiation) from the curing light source 12, a heating effect will be produced, and the oxygen in the air will inhibit the free radical reaction during the curing process of the pressure-sensitive adhesive at high temperatures, thereby causing incomplete curing of the pressure-sensitive adhesive. By filling the shell 3 with nitrogen and maintaining this environment continuously, direct contact between external oxygen and the pressure-sensitive adhesive can be blocked, thereby avoiding the occurrence of the above-mentioned adverse reactions, thereby effectively ensuring the curing effect of the pressure-sensitive adhesive.

[0041] After the pressure-sensitive adhesive is completely cured, the PET film will be transported out from the opening of the cooling block 20. Under the action of the cooling block 20, the nitrogen blown out by the multiple groups of cooling air outlets 21 is cold air, which can quickly cool down the PET film when passing through the cooling block 20, that is, directly cool down the cured pressure-sensitive adhesive quickly, thereby avoiding problems such as performance degradation or deformation of the pressure-sensitive adhesive due to excessive temperature. Moreover, since the multiple groups of cooling air outlets 21 are rotatably connected to the cooling block 20, the blowing direction and range of the cold air (nitrogen) can be adjusted by adjusting the deflection angle of the cooling air outlet 21, so that the cold air can cover the surface of the pressure-sensitive adhesive more evenly, thereby effectively improving the cooling efficiency of the cured pressure-sensitive adhesive.

[0042] When the pressure-sensitive adhesive on the PET film is exposed to ultraviolet light (i.e., UV irradiation), the photoinitiator in the pressure-sensitive adhesive will generate active free radicals or ion radicals after absorbing light energy. These active free radicals or ion radicals further initiate chemical reactions such as polymerization and cross-linking between monomers, so that the pressure-sensitive adhesive is converted from liquid to solid in a short time. In this process, the curing light source 12 inside the housing 3 can be flexibly adjusted to an appropriate light intensity according to the specific curing requirements of the pressure-sensitive adhesive on the PET film. During the operation of the curing light source 12, the semiconductor refrigeration sheet 4 will also start to work, and it will fully cool the heat sink 11 that is in full contact with the curing light source 12, thereby indirectly curing the The light source 12 is cooled down, thereby preventing the performance of the curing light source 12 from being degraded or damaged due to the high temperature accumulated during continuous operation, thereby effectively improving the service life of the curing light source 12. At this time, the fan 5 in the heat dissipation slot 301 is in an on state. In the on state, the fan 5 can drive the air inside the heat dissipation slot 301 to flow continuously. Since the two groups of semiconductor cooling plates 4 are respectively located at the connecting positions of the two groups of heat dissipation slots 301 and the two groups of grooves, the heat generated by the hot end of the semiconductor cooling plate 4 will be taken away and discharged by the air continuously flowing inside the heat dissipation slot 301, thereby ensuring that the semiconductor cooling plate 4 can work continuously and efficiently, thereby ensuring the stable operation of the curing light source 12.

[0043] Since the curing effect of the pressure-sensitive adhesive depends on the photoinitiator promoting the reaction of the photoinitiator and the cross-linking agent under the action of ultraviolet light (UV) of a specific wavelength, the curing uniformity of the pressure-sensitive adhesive is not only related to the uniformity of light, but also to the uniformity of the distribution of the photoinitiator in the pressure-sensitive adhesive during the coating process. If the distribution of the photoinitiator in the pressure-sensitive adhesive coating process is uneven, then under UV light of the same wavelength and intensity, the pressure-sensitive adhesive may be over-cured and incompletely cured, thereby reducing the curing effect of the pressure-sensitive adhesive.

[0044] At the same time, during the UV light curing process of the pressure-sensitive adhesive, ultraviolet rays of a specific wavelength can contact the photoinitiator inside the pressure-sensitive adhesive, and quickly promote chemical reactions, and cause the temperature of the pressure-sensitive adhesive to change. Therefore, when the PET film enters the housing 3 through the conveying portion 2 and passes through the bottom of the test block 6, the ultraviolet emitter 8 at the bottom of the test block 6 will emit concentrated ultraviolet rays of a specific wavelength to evenly irradiate the pressure-sensitive adhesive. At this time, the heat sensor 7 at the bottom of the test block 6 can detect the temperature fluctuations of the pressure-sensitive adhesive in real time, thereby indirectly judging the distribution of the photoinitiator on the pressure-sensitive adhesive. Usually, the wavelength range of ultraviolet rays used for UV light curing is between 200nm and 450nm, and ultraviolet rays of a specific wavelength (i.e., ultraviolet rays with a wavelength of 254nm or 365nm) can more effectively excite the photoinitiator in the pressure-sensitive adhesive, thereby accelerating the chemical reaction of the photoinitiator, and further more efficiently judging the distribution of the photoinitiator on the pressure-sensitive adhesive.

[0045] When the thermal sensor 7 detects that the temperature change amplitude of some areas of the pressure-sensitive adhesive on the PET film is lower than the normal range of other areas, this usually means that the photoinitiator distribution in the area with a smaller temperature change amplitude is less. If it continues to be cured with the current intensity of the curing light source 12, the area may be over-cured due to excessive ultraviolet rays. If the intensity of the entire curing light source 12 is adjusted, it may cause incomplete curing of other areas of the pressure-sensitive adhesive. Therefore, at this time, the built-in motor inside the sliding shell 14 can be turned on to rotate the gear 141 on the sliding shell 14. Since the gear 141 is engaged with the rack 131 installed in the slide groove 13, the two groups of sliding shells 14 can move in the slide groove 13.

[0046] At this time, the two sets of sliding shells 14 are controlled to move in opposite directions, so that the light-transmitting film 15 rolled up together inside the two sets of sliding shells 14 can open a corresponding width according to the size of the area with less photoinitiator distribution on the pressure-sensitive adhesive, and then move to a suitable position together under the synergistic effect of the two sets of sliding shells 14, so that the light-transmitting film 15 can block the area with less photoinitiator, and as the PET film moves during the curing process, the two sets of sliding shells 14 will also drive the light-transmitting film 15 to move accordingly, so that the light-transmitting film 15 always blocks the area with less photoinitiator, and then the light-transmitting film 15 can effectively reduce the area with less photoinitiator on the pressure-sensitive adhesive. The intensity of ultraviolet radiation received by the area effectively ensures that the above-mentioned area will not have the problem of over-curing due to excessive ultraviolet rays. Since the light-transmitting film 15 is provided with an ultraviolet absorber, the ultraviolet protection performance of the light-transmitting film 15 can be improved, and the light-transmitting film 15 can significantly weaken the ultraviolet light of a specific band (mainly UVA), and finally further ensure that the area with less photoinitiator will not have the problem of over-curing due to excessive ultraviolet rays. Since a torsion spring is installed at the connection between the rotating roller in the sliding shell 14 and the inner wall of the cavity, if the light-transmitting film 15 needs to return to the previous winding state later, it is only necessary to control the two groups of sliding shells 14 to move toward each other.

[0047] Due to the existence of the two sets of sliding shells 14, part of the area on the pressure-sensitive adhesive will be completely blocked, which will affect the normal curing of the completely blocked area. At this time, the ultraviolet sensor 19 on the top of the sliding shell 14 detects the ultraviolet radiation intensity from the curing light source 12 on the completely blocked area, and then controls the rotating plate 17 inside the rotating groove 16 to rotate to a suitable angle, and controls the compensation light source 18 to be connected to a suitable amount of electricity, so as to ensure that the area blocked by the sliding shell 14 can also have a suitable ultraviolet radiation intensity. The tilt of the rotating plate 17 can ensure that the compensation light source 18 has as little impact as possible on the UV light curing of the area blocked by the light-transmitting film 15.

[0048] When the thermal sensor 7 detects that the temperature variation of some areas of the pressure-sensitive adhesive on the PET film is higher than the normal range of other areas, this usually means that the area with a larger temperature variation has more photoinitiators distributed. If the area continues to be cured with the current intensity of the curing light source 12, the area may be incompletely cured due to weak ultraviolet rays. At this time, the intensity of the curing light source 12 is increased to ensure that it matches the area with more photoinitiators distributed, thereby avoiding the problem of incomplete curing in the area with more photoinitiators distributed on the pressure-sensitive adhesive. At the same time, under such ultraviolet irradiation intensity, the remaining areas of the pressure-sensitive adhesive are prone to over-curing. Therefore, it is only necessary to adopt the previously mentioned shielding measures through the light-transmitting film 15 to weaken the intensity of ultraviolet radiation and to compensate the light for the area blocked by the sliding shell 14 through the ultraviolet sensor 19 and the compensation light source 18. If the area with more photoinitiator distribution is located in the middle area of ​​the PET film, it is only necessary to add the above-mentioned related structure for shielding and weakening the intensity of ultraviolet radiation. In this way, even if the photoinitiator distribution on the pressure-sensitive adhesive of the PET film is uneven, it can avoid the problem of over-curing or incomplete curing during the curing process, thereby effectively ensuring the curing effect of the pressure-sensitive adhesive on the PET film.

[0049] If it is necessary to coat the surface of the PET film coated with pressure-sensitive adhesive and cured, just pull out the protective film in the rotating cavity through the opening and stick it to the cured and cooled surface of the pressure-sensitive adhesive on the PET film, then open the lifting rod to move the connecting block and the lifting and lowering roller 23 on the connecting block downward until the lifting and lowering roller 23 is pressed down to the surface of the protective film and the protective film and the PET film are tightly attached, and finally the coated PET film is rolled up by an external winding device.

[0050] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A process for preparing a cross-linked modified acrylic pressure-sensitive adhesive, characterized in that: The following steps are involved: S1. The pressure-sensitive adhesive formula material and the composition percentage are 80% to 90% of acrylate polymer, 1% to 3% of the second photoinitiator, and 4% to 12% of the crosslinking agent; S2. The acrylate polymer is composed of the following materials by mass: 80 to 90 parts of soft monomer, 6 to 10 parts of hard monomer, 10 to 20 parts of functional monomer, and 0.1 to 0.3 parts of the first photoinitiator; S3, the soft monomer is isooctyl acrylate, the hard monomer is styrene, the functional monomer is hydroxyethyl acrylate, the first photoinitiator is diphenyl-(2,4,6-trimethylbenzoyl)phosphine, the second photoinitiator is 2-hydroxy-2-methyl-1-phenyl-1-propanone, and the crosslinking agent is epoxy acrylate UV resin, wherein the ratio of soft and hard monomers of the acrylate polymer is: isooctyl acrylate: styrene = 83:7, and the amount of hydroxyethyl acrylate is 12.5%; S4, prepare the acrylate polymer: add the acrylate monomer mixture and the first photoinitiator into a beaker with a magnetic stirring device, the acrylate monomer mixture is a mixture of soft monomers, hard monomers and functional monomers in the acrylate polymer, stir evenly in the above beaker, irradiate with an ultraviolet light source, turn off the light source and continue stirring for 10 minutes, and cool to room temperature to obtain the acrylate polymer; S5. Prepare a cross-linked modified acid ester pressure-sensitive adhesive: add a second photoinitiator and a cross-linking agent to the prepared acrylate polymer, mix well, apply it on a polyethylene terephthalate film with a wire rod coater, perform a degassing operation, and cover the PET film coated with the mixture with a release film; S6. Irradiate the PET film with UV light in a curing device to obtain a PSA film.

2. A preparation device for a cross-linked modified acrylic pressure-sensitive adhesive, applied to the preparation process according to claim 1, comprising a base (1), a conveying portion (2), a shell (3) and a cooling block (20) being installed on the top of the base (1), a PET film coated with a pressure-sensitive adhesive being placed on the conveying portion (2), the shell (3) and the cooling block (20) being both covered on the conveying portion (2), and the shell (3) and the cooling block (20) being connected to each other, the connection between the shell (3) and the cooling block (20) being through-set, an end of the shell (3) away from the cooling block (20) and one side of the cooling block (20) being through-set with an opening for the conveying portion (2) to pass through, and an end of the shell (3) close to the cooling block (20) and the top of the cooling block (20) being jointly installed with a storage shell (22), characterized in that: Also includes: A light curing mechanism, the light curing mechanism being arranged in the housing (3) and being used for UV curing the PET film coated with the pressure-sensitive adhesive; A gas injection mechanism, the gas injection mechanism being arranged on the outer shell (3) and the cooling block (20) and being used to fill the interior of the outer shell (3) with nitrogen; A curing control mechanism, the curing control mechanism comprising a detection component and two groups of slide grooves (13), the two groups of slide grooves (13) being symmetrically arranged on two groups of inner side walls of the outer shell (3), and two groups of sliding shells (14) being slidably connected in the two groups of slide grooves (13), the two groups of sliding shells (14) being located below the light curing mechanism, and the two groups of sliding shells (14) being located between the detection component and the cooling block (20), the detection component being arranged in the outer shell (3) and used for judging the distribution of the photoinitiator in the pressure-sensitive adhesive coated on the PET film, the two groups of slide grooves (13) and the two groups of sliding shells (14) being commonly provided with a driving component for driving the two groups of sliding shells (14) 14) to achieve movement in the slide groove (13), the two groups of sliding shells (14) are each provided with a cavity inside, the two groups of cavities are each rotatably connected with a rotating roller, the two groups of rotating rollers are each installed with a torsion spring at the connection with the inner wall of the cavity, the two groups of sliding shells (14) are each provided with two groups of through grooves on opposite sides, the two groups of cavities are connected with the outside through the two groups of through grooves, a light-transmitting film (15) is inserted into the two groups of through grooves, the two ends of the light-transmitting film (15) are respectively wound around the two groups of rotating rollers, and the two groups of sliding shells (14) are each provided with a fill light component for light compensation for the area on the PET film coated with pressure-sensitive adhesive and blocked by the sliding shell (14).

3. The preparation device of the cross-linked modified acrylate pressure-sensitive adhesive according to claim 2, characterized in that: The light curing mechanism comprises two groups of grooves, the two groups of grooves being symmetrically arranged on two groups of inner side walls of the outer shell (3), and a curing light source (12) being inserted into the two groups of grooves. A cooling component is provided in the outer shell (3) for cooling the curing light source (12).

4. The preparation device of the cross-linked modified acrylate pressure-sensitive adhesive according to claim 3, characterized in that: The cooling component comprises a heat sink (11) and two groups of semiconductor cooling sheets (4); the heat sink (11) is inserted into the two groups of grooves, and the top of the heat sink (11) is in contact with the curing light source (12); the two groups of semiconductor cooling sheets (4) are respectively sealed and mounted on the inner walls of the two groups of grooves, and the two groups of semiconductor cooling sheets (4) are in contact with the heat sink (11); two groups of heat dissipation grooves (301) are provided through the housing (3); the two groups of heat dissipation grooves (301) are respectively connected to the inside of the two groups of grooves; the two groups of semiconductor cooling sheets (4) are respectively located at the positions where the two groups of heat dissipation grooves (301) are connected to the two groups of grooves; and fans (5) are installed in the two groups of heat dissipation grooves (301).

5. The preparation device of the cross-linked modified acrylate pressure-sensitive adhesive according to claim 2, characterized in that: The gas injection mechanism comprises a nitrogen nozzle (9), an atmosphere pipe (10) and a plurality of cooling air outlet heads (21); the nitrogen nozzle (9) is fixedly mounted at one end of the outer shell (3), and the nitrogen nozzle (9) is located at the opening of the outer shell (3); the atmosphere pipe (10) is fixedly mounted through the middle position of the outer shell (3); the plurality of cooling air outlet heads (21) are evenly rotatably connected to the inner top wall of the opening on the cooling block (20); the nitrogen nozzle (9), the atmosphere pipe (10) and the cooling block (20) are all connected to an external gas storage device.

6. The preparation device of the cross-linked modified acrylate pressure-sensitive adhesive according to claim 2, characterized in that: The detection component comprises a test block (6), the test block (6) being fixedly mounted on the inner wall of the housing (3), and a heat sensor (7) and an ultraviolet emitter (8) being mounted on the bottom end of the test block (6), respectively, the ultraviolet emitter (8) being arranged obliquely towards the heat sensor (7), and the ultraviolet wavelength of the ultraviolet emitter (8) being 254 nm or 365 nm.

7. The preparation device of the cross-linked modified acrylate pressure-sensitive adhesive according to claim 2, characterized in that: The driving component comprises two groups of racks (131), the two groups of racks (131) are symmetrically mounted on the inner walls of the two groups of slide grooves (13) near the top ends, gears (141) are mounted on both ends of the two groups of sliding shells (14), and built-in motors are mounted inside the two groups of sliding shells (14) for driving the two groups of gears (141) thereon to rotate, and the two groups of gears (141) on the two groups of sliding shells (14) are respectively meshed with the two groups of racks (131).

8. The preparation device of the cross-linked modified acrylate pressure-sensitive adhesive according to claim 7, characterized in that: The fill light assembly comprises an ultraviolet sensor (19) and a mounting groove, wherein the ultraviolet sensor (19) is fixedly mounted on the top of the sliding shell (14), the mounting groove is formed at the bottom of the sliding shell (14), and a rotating plate (17) is rotatably connected in the mounting groove, a compensation light source (18) is mounted at the bottom of the rotating plate (17), and a rotating groove (16) is formed on the top wall of the mounting groove for the rotating plate (17) to rotate.

9. The preparation device of the cross-linked modified acrylate pressure-sensitive adhesive according to claim 2, characterized in that: An ultraviolet absorber is arranged in the light-transmitting film (15), and the inner walls of the two groups of cavities near the through grooves are rotatably connected to leveling rollers, and the outer walls of the leveling rollers in the two groups of cavities are in contact with the top of the light-transmitting film (15).

10. The preparation device of the cross-linked modified acrylate pressure-sensitive adhesive according to claim 2, characterized in that: It also includes a coating mechanism, which includes a rotating chamber and two groups of lifting rods. The rotating chamber is opened inside the storage shell (22), and a through hole is penetrated at the bottom end of the rotating chamber. A winding roller is rotatably connected in the rotating chamber, and a protective film is wound around the winding roller. The end of the protective film away from the winding roller is located at the through hole. The two groups of lifting rods are symmetrically installed at the bottom end of the storage shell (22), and the two groups of lifting rods are located on the outward side of the cooling block (20). The output ends of the two groups of lifting rods are both installed with connecting blocks, and the two groups of connecting blocks are rotatably connected to the lifting and lowering rollers (23).

Images