CN112099118A - Enhanced light-gathering prism film, backlight module and preparation method of enhanced light-gathering prism film - Google Patents

Enhanced light-gathering prism film, backlight module and preparation method of enhanced light-gathering prism film Download PDF

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CN112099118A
CN112099118A CN202011283019.3A CN202011283019A CN112099118A CN 112099118 A CN112099118 A CN 112099118A CN 202011283019 A CN202011283019 A CN 202011283019A CN 112099118 A CN112099118 A CN 112099118A
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acrylate
film
light
prism
pressure
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CN112099118B (en
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不公告发明人
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Guangzhou Buluoshen New Material Technology Co ltd
Guangzhou Nano New Material Technology Co ltd
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Guangzhou Buluoshen New Material Technology Co ltd
Guangzhou Nano New Material Technology Co ltd
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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/04—Prisms
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/02—Diffusing elements; Afocal elements
    • G02B5/0205—Diffusing elements; Afocal elements characterised by the diffusing properties
    • G02B5/021—Diffusing elements; Afocal elements characterised by the diffusing properties the diffusion taking place at the element's surface, e.g. by means of surface roughening or microprismatic structures
    • G02B5/0231—Diffusing elements; Afocal elements characterised by the diffusing properties the diffusion taking place at the element's surface, e.g. by means of surface roughening or microprismatic structures the surface having microprismatic or micropyramidal shape
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/02—Diffusing elements; Afocal elements
    • G02B5/0268—Diffusing elements; Afocal elements characterized by the fabrication or manufacturing method
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133602—Direct backlight
    • G02F1/133606—Direct backlight including a specially adapted diffusing, scattering or light controlling members

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  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Nonlinear Science (AREA)
  • Mathematical Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Optical Elements Other Than Lenses (AREA)

Abstract

The invention discloses a strengthened light-gathering prism film, wherein a substrate layer comprises a light-in surface and a light-out surface, a light-gathering microstructure layer comprises prism units arranged on the light-out surface and lens units arranged on the light-in surface, and all the units are regularly arranged from inside to outside in a Fresnel form; and special ultraviolet curing adhesives are filled in the spherical crown-shaped counter bores of the lens units, and the light path of the prism film is adjusted through the plano-convex lens formed by the special ultraviolet curing adhesives: the lens unit performs primary light collection, and the prism unit performs secondary light collection, so as to enhance the optical gain of the prism film. The invention also discloses a backlight module comprising the strengthened condensing prism film and a preparation method thereof. The invention also discloses a special ultraviolet curing adhesive and a preparation method thereof. The invention can improve the optical performance of the backlight module, reduce the whole thickness and simplify the process flow by strengthening the secondary light-gathering microstructure layer of the light-gathering prism film and the special ultraviolet light curing adhesive.

Description

Enhanced light-gathering prism film, backlight module and preparation method of enhanced light-gathering prism film
Technical Field
The invention relates to the technical field of liquid crystal display, in particular to a strengthened condensing prism film, a backlight module and a preparation method thereof, and also relates to a special ultraviolet curing adhesive and a preparation method thereof.
Background
Liquid crystal displays (TFT-LCDs) have been widely used in electronic products such as televisions, displays, mobile phones, digital cameras, etc. of various specifications, backlight modules are devices for providing additional light sources for liquid crystal displays, and brightness enhancement films are used as core components of backlight modules, and have been widely used in recent years. The liquid crystal display mainly comprises a liquid crystal panel and a backlight module, wherein the backlight module comprises a light source, a reflecting film, a light guide plate and an optical module, the existing optical module comprises an upper diffusion film, an upper brightness enhancement film, a lower brightness enhancement film and a lower diffusion film, the diffusion film converts a point light source or a line light source into a surface light source, and the brightness enhancement film is used for concentrating originally diffused light to the axial direction and improving the front-view brightness of the display.
The Brightness Enhancement Film (BEF) is also called a prism sheet or a condensing sheet, and a Film or a sheet capable of improving the light emitting efficiency of the whole backlight system in a TFT-LCD backlight module utilizes the special prism structure of the Brightness Enhancement Film to concentrate light rays in all directions to a central viewing angle by optical principles such as refraction, total reflection, light accumulation and the like, thereby improving the Brightness of an LCD panel and controlling the viewing angle. The existing brightness enhancement films all condense light through a microprism unit structure. Generally, a single microprism brightness enhancement film is provided with only one microprism unit structure, which can improve the brightness by 130%, and the backlight module generally needs to realize a gain of 250% or more by matching two crossed brightness enhancement films, so as to meet the market demand.
Two brightness enhancement films cross-mated, referred to as composite brightness enhancement film pop (prism on prism). The composite brightness enhancement film has the advantages that the thickness of the composite brightness enhancement film is reduced by 45 parts compared with that of two brightness enhancement films, the luminance is reduced by 6 parts compared with that of the two brightness enhancement films but is improved by 8 parts compared with that of one brightness enhancement film, the assembly efficiency is high, but the composite brightness enhancement film has the defects that the two brightness enhancement films are easy to delaminate, the optical luminance is reduced, and the composite brightness enhancement film is easy to scratch during cutting.
In order to solve the problem, the chinese patent publication CN 109796562a discloses a composition, a brightness enhancement film and an application thereof, which discloses that the cutting yield can be improved by attaching protective films to the front and back sides of the brightness enhancement film when the brightness enhancement film is rolled into a roll. However, when the protective film is removed in the subsequent process, the composite brightness enhancement film is prone to creep and adhesive residue, and the preparation process and the material cost are increased.
Chinese patent publication CN 105353431 a discloses a base film for a composite brightness enhancement film, which is characterized in that an anti-sticking protective layer (release layer) coated on the surface of a brightness enhancement film support is added to solve the problem that in order to prevent the pollution and scratch of a film sheet in a backlight module processing factory, protective films (such as PE protective films) need to be coated on two surfaces of the composite brightness enhancement film, however, the surface of the matte layer of the brightness enhancement film has particle protrusions, so that a general protective film cannot be coated or is not firmly adhered, and the protective film with high adhesiveness is easy to have adhesive residue during post-processing peeling. The anti-sticking protective layer has diffusion and atomization effects, and can replace a diffusion film after the protective film is peeled off in post-processing.
Therefore, in the prior art, in the manufacturing process of the composite brightness enhancement film, the protective films are firstly adhered on two sides of the composite brightness enhancement film to manufacture a large sheet of the composite brightness enhancement film, and then the protective films are peeled off in the post-processing process of cutting and using the small composite brightness enhancement film, so that the production process is multiple, the production efficiency is low, and the protective films with the area twice as large as that of the brightness enhancement film are additionally consumed. The composition or the anti-sticking protective layer provided by each prior art scheme also does not have the function of remarkably improving the overall light efficiency of the optical module.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide a strengthened light-gathering prism film, wherein the brightness of a single prism film can be improved by more than 160% by arranging a secondary light-gathering microstructure layer and adjusting the light path of the prism film;
another objective of the present invention is to provide a backlight module, which directly uses a composite brightness enhancement film including a strengthened condensing prism film as an optical module, and solves the problem of attaching and removing a protection film during the manufacturing process by synchronously optimizing the structure and process, so that the attaching and removing of the protection film are not required, the structure and the manufacturing process of the backlight module are simplified, the overall thickness is reduced, and the overall light efficiency of the optical module can be significantly improved.
The invention also provides a special ultraviolet curing adhesive, which realizes the specific effects through a special formula and process design: after the first UV curing, a pressure-sensitive release coating and a protective brightness enhancement film are formed, the film can be directly rolled without sticking and removing a protective film on the brightness enhancement film, and therefore residual glue is not left; after uncoiling, rolling to ensure that the pressure-sensitive release coating coated on the back is attached to the prism surface of the lower brightness enhancement film, and synchronously carrying out second UV curing to ensure that the pressure-sensitive release coating is converted into a sealing bonding layer; the sealing bonding layer enables the two layers of brightness enhancement films to be firmly bonded together, and simultaneously exhausts air in a gap between the two layers of films to form bonding, thereby enhancing the optical performance of the composite brightness enhancement film and enabling the composite brightness enhancement film to form an integrated optical module.
The invention also provides a preparation method of the special ultraviolet curing adhesive, and the purposes of simplifying the production flow, reducing the overall thickness of the optical module, improving the production efficiency, saving materials and increasing the overall light efficiency of the optical module are achieved.
In order to achieve the purpose, the invention provides the following technical scheme:
a strengthened light-gathering prism film is characterized by comprising a substrate layer, wherein the substrate layer comprises a light-in surface and a light-out surface, the light-in surface and the light-out surface are respectively provided with a light-gathering micro-structural layer, the light-gathering micro-structural layer comprises prism units arranged on the light-out surface and lens units arranged on the light-in surface, and all the units are regularly arranged from inside to outside in a Fresnel mode; the prism unit is formed by a tooth-shaped convex part and a tooth-shaped concave part which extend out of the base surface to the outside; the lens unit is a plano-convex lens formed by a spherical-crown-shaped counter bore which is arranged on the light incident surface of the substrate layer and is concave to the inner side of the base plane and a special ultraviolet light curing adhesive which is filled in the spherical-crown-shaped counter bore, the convex surface of the lens unit faces the light emergent surface, the plane of the lens unit faces the light incident surface, and the lens unit is regularly arranged on the back surface of the convex part of the prism unit at; and special ultraviolet curing adhesives are filled in the spherical crown-shaped counter bores of the lens units, and the light path of the prism film is adjusted through the plano-convex lens formed by the special ultraviolet curing adhesives: the lens unit performs primary light collection, and the prism unit performs secondary light collection, so as to enhance the optical gain of the prism film.
The diameter of each spherical-crown-shaped counter bore of the lens unit is 40-60% of the root width of the bulge of the single prism unit, and the depth of each spherical-crown-shaped counter bore is 10-15% of the thickness from the bottom surface of the base material to the top end of the bulge of the prism unit; the distance between the centers of two adjacent spherical crown counter bores is 150-200% of the diameter of the two adjacent spherical crown counter bores; the spherical crown shaped counter bore is completely filled with a special ultraviolet light curing adhesive.
The lens unit of setting on substrate layer income plain noodles one side is in the plane one side of spherical cap shape counter bore, sets up the cylindrical counter bore that the diameter is the same, communicates each other that the base plane is recessed to the inboard from the substrate layer income plain noodles, and spherical cap shape counter bore sets up in the front portion of cylindrical counter bore, the one side that is close to the play plain noodles, forms compound cylindrical counter bore after the two communicates, packs the special ultraviolet curing adhesive in this compound cylindrical counter bore after, the cylindrical lens unit of formation.
The diameter of the cylindrical counter bore of the cylindrical lens unit is 40-60% of the width of the root of the bulge of the single prism unit, and the depth of the cylindrical counter bore is 20-30% of the thickness from the bottom surface of the base material to the top end of the bulge of the prism unit; the distance between the centers of two adjacent cylindrical counter bores is 150-200% of the diameter of the counter bores; the composite cylindrical counter bore is completely filled with a special ultraviolet curing adhesive.
A backlight module adopting the strengthened condensing prism film is characterized by comprising a backlight plate, a reflector plate, a light guide plate, a composite brightness enhancement film and a backlight source arranged on the side edge of the light guide plate, wherein the backlight plate, the reflector plate, the light guide plate and the composite brightness enhancement film are sequentially stacked from front to back; the composite brightness enhancement film comprises at least two films of an upper diffusion film, an upper layer prism film and a lower layer prism film which are sequentially stacked up and down, and the two films are bonded by adopting a special ultraviolet light curing adhesive to form a release/bonding layer with high light transmittance; at least one layer of the upper layer prism film or the lower layer prism film is the strengthened condensing prism film; the special ultraviolet light curing adhesive is coated on the back surface of the upper layer film, forms a pressure-sensitive release coating after the first UV curing, and is directly wound; pressure-sensitive release coating for back coating after upper film is uncoiledThe layer is jointed with the prism surface of the lower layer film through rolling and synchronously carries out the second UV curing, so that the pressure-sensitive release coating is formed into a sealing bonding layer; the sealing bonding layer evacuates air in a gap between the two layers of films to form bonding, so that the optical performance of the composite brightness enhancement film is enhanced; wherein the first UV curing is ultraviolet irradiation intensity of 10-50 mJ/cm2The second UV curing is ultraviolet irradiation intensity of 800-1000 mJ/cm2High energy curing of (2).
The preparation of the reinforced condensing prism film of the backlight module comprises the following steps:
1) respectively preparing an upper diffusion film, an upper layer prism film, a lower layer prism film and a special ultraviolet curing adhesive;
2) diluting the special ultraviolet curing adhesive to a set viscosity by using a solvent, uniformly coating the special ultraviolet curing adhesive on the back surface of the upper layer film by using a precision coating machine, baking the special ultraviolet curing adhesive in a drying tunnel at the temperature of 80-90 ℃ for a set time, and removing the solvent from the coating to form a back surface adhesive coating;
3) the back adhesive coating is coated by using a common high-pressure mercury lamp and low curing energy, namely ultraviolet irradiation intensity of 10-50 mJ/cm2Carrying out first UV curing to enable partial chemical bonds in the coating material to react and form a pressure-sensitive release coating on the back surface of the upper layer film, wherein the pressure-sensitive release coating has pressure sensitivity only under the condition that the pressure is not less than 0.3MPa, and has anti-sticking (release) performance under the pressure, and the upper layer film is directly rolled without additionally sticking a protective film to finish the preparation of the upper layer film;
4) uncoiling the upper layer film back-coated with the pressure-sensitive release coating, and enabling the pressure-sensitive release coating back-coated with the upper layer film to be attached to the prism surface of the lower layer film through rolling, wherein the rolling pressure intensity range is 0.3-0.5 MPa (the rolling pressure is too small, and the pressure-sensitive release coating has no pressure sensitivity; the prism layer of the brightness enhancement film can be damaged due to overlarge rolling pressure), and a common high-pressure mercury lamp is synchronously used, and the irradiation intensity of high curing energy, namely ultraviolet light, is 800-1000 mJ/cm2Carrying out secondary UV curing to enable chemical bonds in the pressure-sensitive release coating to continue reacting to form a sealing bonding layer with high bonding property, and tightly bonding the upper layer of film and the lower layer of filmThe two layers of the composite brightness enhancement film are prepared together; the sealing bonding layer simultaneously evacuates air in a gap between the two layers of films and forms bonding, thereby enhancing the optical performance of the composite brightness enhancement film.
The preparation method of the reinforced condensing prism film further comprises the following steps:
one of the upper diffusion film or the upper layer prism film in the step 1) is an upper layer film, and one of the upper layer prism film or the lower layer prism film is a lower layer film;
the solvent in the step 2) is butyl acetate, the walking speed is 20-25 m/min in a drying tunnel at the temperature of 80-90 ℃, and the baking time is set to be 1-3 minutes, so that the solvent is removed from the coating;
the pressure-sensitive release coating in the step 3) has pressure sensitivity only under the condition of not less than 0.3MPa pressure and has anti-sticking performance under the pressure; in the first UV curing process, 10-20% of polymerizable chemical bonds in the special ultraviolet curing adhesive are subjected to photopolymerization reaction, so that the coating forms a pressure-sensitive release coating without adhesiveness under low pressure;
and 4) carrying out second UV curing to further carry out photopolymerization on 80-90% of polymerizable chemical bonds in the pressure-sensitive release coating so as to further form the pressure-sensitive release coating into a sealing bonding layer with high bonding property.
The special ultraviolet curing adhesive for preparing the enhanced light-gathering prism film or the backlight module is characterized by being prepared from the following components in parts by weight:
60-70 parts of polyacrylate UV resin solution, 25-35 parts of acrylate reactive diluent, 1-5 parts of photoinitiator, 0.1-5 parts of filler and 0.1-5 parts of auxiliary agent.
The preparation method of the polyacrylate UV resin solution comprises the following steps:
A) adding 150 ml of toluene into a 500 ml four-neck flask provided with a thermometer, a condenser and a stirring device, and raising the temperature of a flask solution to 70-90 ℃;
B) weighing the components, namely isobutyl acrylate, according to the following set mass ratio: methyl methacrylate: hexafluorobutyl acrylate: hydroxyethyl acrylate: n-dodecyl mercaptan: azobisisobutyronitrile = (6-8): (2-4): (1-2): (0.5-1): 0.1: (0.3-0.6), uniformly mixing an acrylate soft monomer, an acrylate hard monomer, an acrylate functional monomer, hydroxyl acrylate, n-dodecyl mercaptan (NDM) and Azobisisobutyronitrile (AIBN) to obtain a mixed solution, and putting the mixed solution into a titration funnel;
C) slowly dripping the mixed solution in the titration funnel into a four-neck flask, stirring and dripping, finishing dripping within 3-3.5 hours, and then preserving heat at 80 ℃ for 3 hours to react completely;
D) adding sodium sulfite accounting for 5% of the total mass of reactants, stirring and reacting at 70-80 ℃ for 15-30 minutes, and reducing the residual azodiisobutyronitrile;
E) and finally adding a polymerization inhibitor accounting for 0.1 percent of the mass of the total reactants, adding acrylic acid accounting for 1.05 times of the mole number of the hydroxyl acrylate, simultaneously adding a solid acid catalyst accounting for 0.1 percent of the mass of the total reactants, raising the temperature to the reflux temperature, then refluxing and dividing water, stopping the reaction when the detected water yield reaches the water accounting for 0.98 times of the mole number of the hydroxyl acrylate, pouring out the solution, and removing solids through suction filtration to obtain the polyacrylate UV resin solution.
The ratio of the acrylate soft monomer to the acrylate hard monomer in the step B is 8: 2-6: 4, the acrylate functional monomer accounts for 10-20% of the total amount of the acrylate soft monomer and the acrylate hard monomer, and the hydroxyl acrylate accounts for 5-10% of the total amount of the acrylate soft monomer and the acrylate hard monomer.
The acrylate soft monomer in the step B is at least one of butyl acrylate, isobutyl acrylate, isooctyl acrylate and octadecyl acrylate; the acrylate hard monomer is at least one of methyl (methyl) acrylate, isobornyl (methyl) acrylate and acetoacetic acid glycol diester methacrylate.
The acrylate functional monomer in the step B is fluorine-containing acrylate, and specifically is one or more of trifluoroethyl (meth) acrylate, hexafluorobutyl (meth) acrylate, dodecafluoroheptyl (meth) acrylate and tridecafluoroctyl (meth) acrylate.
The hydroxy acrylate in the step B is at least one of hydroxyethyl acrylate, hydroxyethyl methacrylate, hydroxypropyl acrylate and hydroxypropyl methacrylate; the polymerization inhibitor is at least one of hydroquinone, p-hydroxyanisole, 2, 5-dimethyl hydroquinone and 1, 4-naphthalenediol; the solid acid catalyst is at least one of amberlyst15, amberlyst35, amberlyst36, amberlyst45, amberlyst21, amberlyst26 and NKC-9 macroporous strong acid cation exchange resin catalyst.
The special ultraviolet curing adhesive is characterized in that: the acrylate reactive diluent is at least one of lauryl (meth) acrylate, 2-phenoxyethyl (meth) acrylate, ethoxylated phenoxy (meth) acrylate, trimethylcyclohexyl (meth) acrylate, ethoxyethoxyethyl (meth) acrylate, tetrahydrofurfuryl (meth) acrylate, stearyl (meth) acrylate, decyl (meth) acrylate and isobornyl (meth) acrylate; the photoinitiator is at least one of 1-hydroxycyclohexyl phenyl ketone, 2-hydroxy-2-methyl-1-phenyl-1-acetone, 2-dimethoxy-2-phenyl acetophenone, 2,4, 6-trimethylbenzoyl-diphenyl phosphine oxide and tetra (2, 4-di-tert-butylphenyl) -4, 4' -biphenyl diphosphite; the filler is at least one of polymer elastic particles; the auxiliary agent is at least one of a wetting dispersant, a defoaming agent and a flatting agent; the wetting dispersant is acrylate polymer; the defoaming agent is organosilicon or acrylate polymer; the leveling agent is organic silicon.
The ultraviolet light curing adhesive is characterized in that: wherein the acrylate reactive diluent is at least one of 2-phenoxyethyl (methyl) acrylate and isobornyl (methyl) acrylate; the photoinitiator is 1-hydroxycyclohexyl phenyl ketone and 2,4, 6-trimethylbenzoyl-diphenyl phosphine oxide; the filler is polymethyl methacrylate elastic particles; the auxiliary agent is at least one of organic silicon polymer and acrylate polymer.
The preparation method of the special ultraviolet curing adhesive is characterized by comprising the following steps:
according to the weight parts, 60-70 parts of polyacrylate UV resin solution, 25-35 parts of acrylate reactive diluent, 1-5 parts of photoinitiator, 0.1-5 parts of filler and 0.1-5 parts of auxiliary agent are respectively prepared, the components are sequentially placed in a mixer, after the components are uniformly stirred, the mixture is vacuumized and stirred until no bubbles exist, and after the mixture is stood to room temperature, the special ultraviolet curing adhesive is obtained.
Further, the prepared special ultraviolet curing adhesive is put into a black or dark ultraviolet-tight package for sealed storage and is stored at room temperature.
Compared with the prior art, the invention has the following advantages and beneficial effects:
(1) the reinforced light-gathering prism film provided by the invention adopts a secondary light-gathering composite microstructure which adopts a lens unit (a plano-convex lens formed by the special ultraviolet light curing adhesive) to gather light for the first time and adopts a prism unit to gather light for the second time, so that the optical gain of the prism film can be greatly enhanced; through actual tests, the brightness of the single prism film can be improved by over 160 percent, and after the single prism film is compounded with other films, the brightness of the two layers of brightness enhancement films can be improved by over 260 percent; meanwhile, the special ultraviolet curing adhesive filled in each counter bore of the lens unit can be used for laminating and bonding a diffusion film or another prism film on the surface facing to the outside on one hand, and can be used for adjusting the light path of the prism film through the plano-concave lens on the other hand.
(2) The backlight module directly uses the high-gain composite brightness enhancement film including the enhanced light-gathering prism film as an integrated optical module to simplify the structure, and omits the working procedure of sticking/stripping the protective film through the special coating design with variable performance, thereby greatly simplifying the production working procedure and saving raw materials. Specifically, when a single-layer brightness enhancement film is processed, a special ultraviolet curing adhesive is coated on the back surface of an upper layer film to form a coating, the coating forms a pressure-sensitive release layer after first UV curing, and the pressure-sensitive release layer has protection and release effects on the upper layer film, so that the upper layer film can be directly rolled without coating a protective film on the back, and therefore, in the post-processing process, the operation of stripping the protective film is not needed, and residual adhesive and light effect cannot be left on the surface of the brightness enhancement film; and when two layers of brightness enhancement films are subjected to combined processing, the upper layer film is uncoiled and then is rolled under a specific pressure, so that the coating adhesive surface of the special ultraviolet curing adhesive for back coating is tightly attached to the prism surface of the lower layer brightness enhancement film, and after the second UV curing, the two films are firmly bonded together to form an optical module without secondary gluing and pressing bonding. On the one hand, the total thickness of the optical module can be reduced, the total light efficiency of the backlight module is increased, meanwhile, the production flow can be simplified, the production efficiency is improved, raw materials are saved, the cost is reduced, the pressure-sensitive release layer formed by the first-time curing of the pressure-sensitive release layer is utilized, and the problems that two films are easy to be layered, the optical brightness is reduced, and the defects such as dislocation, creep deformation and scratch are easy to occur during cutting are solved.
(3) The special ultraviolet curing adhesive and the preparation method thereof provided by the invention can meet the requirement of simplifying the structure and process design of the composite brightness enhancement film by synchronously improving the components and the preparation process. The coating is cured for two times, and the requirements of coatings with different performances are respectively formed after each curing; when the soft monomer in the synthesis of the adopted polyacrylate UV resin solution can promote the low-energy UV curing, the back adhesive coating has pressure-sensitive adhesive property under a set larger pressure; the hard monomer can improve the cohesive force of the back adhesive coating; the functional monomer can enable the back adhesive coating to generate release performance, and a protective film (release film) does not need to be additionally attached when the single-layer brightening film is prepared. When the special ultraviolet light curing adhesive coating provided by the invention is subjected to first UV curing, a plurality of reactive acrylate double bonds are contained in macromolecular polyacrylate UV resin, and only a small part (10-20%) of the double bonds are subjected to polymerization reaction during low-energy curing to form a pressure-sensitive/release coating with lower viscosity; during the second UV curing, under the high-energy curing, the polymerization reaction is continuously carried out on the residual unreacted majority (80-90%) of the double bonds of the acrylate and part of the monomers, so that the pressure-sensitive release coating reaches a specific pressure and further forms a sealing bonding layer with high bonding property, the two brightness enhancement films are firmly bonded together, and meanwhile, the air in the gap between the two layers of films is evacuated to form bonding, so that the optical performance of the composite brightness enhancement film is enhanced; through practical tests, the optical brightness can reach 260% of gain, and the optical brightness is not reduced.
(4) When the pressure-sensitive release coating coated on the back of the upper layer film of the high-gain brightness enhancement film is rolled and adhered to the prism surface of the lower layer film, the rolling pressure range is specific 0.3-0.5 MPa, and if the rolling pressure is too small, the pressure-sensitive release coating does not have pressure sensitivity; the prism layer of the brightness enhancement film is damaged due to overlarge rolling pressure; when the first UV curing is finished, the degree of polymerization reaction of each component needs to be controlled, so that the initial pressure of pressure-sensitive effect viscosity of the pressure-sensitive release coating reaches 0.3 MPa.
(5) According to the invention, the average thickness of a coating formed by the ultraviolet curing adhesive coating liquid (containing a diluent) on the back surface of the high-gain brightness enhancement film is about 8-9 μm, and the average thickness of the pressure-sensitive release layer/sealing bonding layer formed by drying, rolling and ultraviolet curing is about 2-3 μm, so that the requirements of protecting, bonding and sealing each layer of the gain composite brightness enhancement film, improving the optical performance of the gain composite brightness enhancement film, reducing the thickness of a backlight module body, simplifying the process flow and the like can be better met.
Drawings
Fig. 1 is a schematic perspective view of an enhanced light-gathering prism film according to an embodiment of the present invention;
fig. 2 is a schematic cross-sectional view of an enhanced light-collecting prism film according to embodiment 1 of the present invention;
fig. 3 is a schematic cross-sectional view of an enhanced light-collecting prism film according to embodiment 2 of the present invention;
fig. 4 is a schematic view of an overall assembly structure of the backlight module according to the embodiment of the invention.
In the figure:
1. the backlight module comprises a backlight plate 2, a reflector plate 3, a light guide plate 4, a composite brightness enhancement film 5, a backlight source 10 and a backlight module; 8. the light source comprises a reinforced light-gathering prism film 80, a base material layer 81, a light-in surface 82, a light-out surface 83, prism units 84, lens units 85 and tooth-shaped convex parts; 86. a toothed recessed portion; 87. A cylindrical counterbore; 88. the filled special ultraviolet light curing adhesive; 89. a spherical crown shaped counter bore.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples, but the embodiments of the present invention are not limited thereto. The raw material components in the examples of the present invention were all commercially available except for those explicitly described as self-made. Among them, hexafluorobutyl acrylate (brand G01), dodecafluoroheptyl acrylate (brand G05), and tridecafluorooctyl acrylate (brand G06C) are produced by Harbin snow-good fluorosilicone chemical Co. The polymerization inhibitors p-hydroxyanisole and hydroquinone are produced in French Rodiya. The solid acid catalyst amberlyst15, NKC-9 macroporous strong acid cation exchange resin and amberlyst36 are produced by south China synthetic chemistry Co. 2-phenoxyethyl acrylate (trade name EM 210), isobornyl acrylate (trade name EM 70), isobornyl methacrylate (trade name EM 90), ethoxylated phenoxyacrylate (trade name EM 2103), tetrahydrofurfuryl acrylate (trade name EM 214), and ethoxyethyl acrylate (trade name EM 211) are produced by Taiwan Yongxing. The photoinitiators 1-hydroxycyclohexylphenylketone (trade name 184) and 2,4, 6-trimethylbenzoyl-diphenylphosphine oxide (trade name TPO) are produced by BASF in Germany.
Example 1:
referring to fig. 1 and 2, the strengthened light-gathering prism film 8 provided in the embodiment of the present invention includes a substrate layer 80, where the substrate layer 80 includes a light incident surface 81 and a light emergent surface 82, where the light incident surface 81 and the light emergent surface 82 are respectively provided with a light-gathering microstructure layer, the light-gathering microstructure layer includes a prism unit 83 disposed on the light emergent surface and a lens unit 84 disposed on the light incident surface, and each of the units 83 and 84 is regularly arranged from inside to outside in a fresnel manner; the prism unit 83 is formed by a tooth-shaped convex part 85 and a concave part 86 which extend outwards from the base surface of the base material layer 80; the lens unit 84 is a plano-convex lens formed by a spherical-crown-shaped counter bore 89 which is arranged on the light incident surface 81 of the base material layer and is concave towards the inner side of the base surface and a special ultraviolet curing adhesive 88 which is filled in the spherical-crown-shaped counter bore, the convex surface of the lens unit 84 faces the light emergent surface, the plane faces the light incident surface, and the lens unit 84 is regularly arranged on the back surface (mirror image, right opposite surface) of the convex part 85 of the prism unit 83; the spherical crown-shaped counter bores 89 of the lens units 84 are filled with special ultraviolet curing adhesives 88, and the light path of the prism film is adjusted through the plano-convex lens formed by the special ultraviolet curing adhesives: the lens unit 84 performs the first light collection and the prism unit 83 performs the second light collection to enhance the optical gain such as the light collection effect of the prism film 8.
The diameter of each spherical-crown-shaped counter bore 89 of the lens unit 84 is 40-60% of the width of the root of the bulge 85 of the single prism unit, and the depth is 10-15% of the thickness from the bottom surface of the base material to the top end of the bulge 85 of the prism unit; the distance between the centers of two adjacent spherical crown shaped counter bores 89 is 150-200% of the diameter of the two adjacent spherical crown shaped counter bores; the spherical crown-shaped counter bore 89 is completely filled with a special ultraviolet light curing adhesive to form a plano-convex lens structure for first light condensation. The connecting line of the circle centers of the spherical crown shaped counter bores 89 and the connecting line of the top ends of the tooth-shaped convex parts 85 of the corresponding prism units 83 are overlapped with each other in the top view of the three-dimensional space.
In the embodiment of the invention, the strengthened light-gathering prism film 8 is composed of a substrate layer 80 and two light-gathering microstructure layers 83 and 84, the substrate layer 80 is made of a PET material, the refractive index is 1.65, the two light-gathering microstructure layers are respectively carved, molded by a mold or formed on two sides of the PET substrate in an ultraviolet curing mode, the refractive index of the material of each light-gathering microstructure layer is 1.56, the two light-gathering microstructure layers are combined together in the thickness direction, the width of the root part of the convex part 85 of the prism unit is 0.05mm, and the thickness from the bottom surface of the substrate layer 80 to the top end of the convex part 85 of the prism unit is 0.1-. From this, specific dimensions or dimensional ranges of the lens unit 84 and other structures may be calculated separately.
Through practical tests, the enhanced light-gathering prism film 8 provided by the embodiment of the invention has the advantage that the light-gathering effect is improved by 1.2-1.5 times compared with that of the existing common prism film through twice light gathering.
The above specific dimensions or dimensional ranges of the structures of the various parts provided by the embodiments of the present invention can be specifically selected according to the needs, and the technical effects described in the present invention can be achieved. Therefore, this embodiment is not listed one by one.
Referring to fig. 4, the backlight module 10 including the strengthened condensing prism film 8 provided in this embodiment includes a backlight plate 1, a reflector plate 2, a light guide plate 3, a composite brightness enhancement film 4, and a backlight source 5 disposed on a side of the light guide plate 3, which are sequentially stacked from front to back; the composite brightness enhancement film 4 comprises an upper diffusion film and an upper prism film which are sequentially stacked up and down, and the two films are bonded by a special ultraviolet curing adhesive to form a release/bonding layer with high light transmittance; wherein the upper layer prism film is the strengthened light-gathering prism film 8; the special ultraviolet light curing adhesive is coated on the back surface of the upper layer film, forms a pressure-sensitive release coating after the first UV curing, and is directly wound; after the upper film is uncoiled, the pressure-sensitive release coating coated on the back is adhered to the prism surface of the lower film through rolling, and the second UV curing is synchronously carried out, so that the pressure-sensitive release coating is formed into a sealing bonding layer; the sealing bonding layer evacuates air in a gap between the two layers of films to form bonding, thereby gaining the optical performance of the composite brightness enhancement film and forming an integrated optical module; wherein the first UV curing is ultraviolet irradiation intensity of 10-50 mJ/cm2The second UV curing is ultraviolet irradiation intensity of 800-1000 mJ/cm2High energy curing of (2).
In this embodiment, the upper diffusion film of the composite brightness enhancement film 4 is an upper layer film, and the upper prism film is a lower layer film. The composite brightness enhancement film 4 is directly used as an optical module of a backlight module without separately arranging a diffusion film layer and a prism layer.
The preparation method of the composite brightness enhancement film 4 in the backlight module 10 comprises the following steps:
1) respectively preparing an upper diffusion film, an upper layer prism film and a special ultraviolet light curing adhesive;
2) diluting the special ultraviolet curing adhesive to a set viscosity by using a solvent, uniformly coating the special ultraviolet curing adhesive on the back surface of the upper layer film by using a precision coating machine, baking the special ultraviolet curing adhesive in a drying tunnel at the temperature of 80-90 ℃ for a set time, and removing the solvent from the coating to form a back surface adhesive coating;
wherein the solvent is butyl acetate, the walking speed is 20-25 m/min in a drying tunnel at the temperature of 80-90 ℃, and the set baking time is 1-3 minutes, so that the solvent is removed from the coating;
3) the back adhesive coating is coated by using a common high-pressure mercury lamp and low curing energy, namely ultraviolet irradiation intensity of 10-50 mJ/cm2Carrying out first UV curing to enable partial chemical bonds in the coating material to react and form a pressure-sensitive release coating on the back surface of the upper layer film, wherein the pressure-sensitive release coating has pressure sensitivity in a set pressure interval and has anti-sticking (release) performance outside the pressure interval, and the upper layer film is directly rolled without additionally covering a protective film on the outer surface of the coating;
wherein the pressure-sensitive release coating has pressure-sensitive properties only when the pressure range of rolling is not less than (i.e., not less than) 0.3MPa, and has anti-sticking (releasing) properties below the pressure range; in the first UV curing process, 10-20% of polymerizable chemical bonds in the special ultraviolet curing adhesive are subjected to photopolymerization reaction, so that the coating forms a pressure-sensitive release coating without adhesiveness under low pressure;
4) uncoiling the upper layer film coated with the pressure-sensitive release coating, enabling the pressure-sensitive release coating coated on the back of the upper layer film to be attached to the prism surface of the lower layer film through rolling, setting the rolling pressure range to be 0.3-0.5 MPa, and synchronously using a common high-pressure mercury lamp, and setting the high curing energy, namely ultraviolet irradiation intensity to be 800-1000 mJ/cm2Carrying out secondary UV curing to ensure that chemical bonds in the pressure-sensitive release coating continuously react and form a sealing bonding layer with high bonding property under the combined action of the set pressure not less than 0.3MPa, and tightly bonding the upper layer film and the lower layer film together to finish the preparation of the double-layer composite brightness enhancement film; at the moment, the sealing bonding layer simultaneously evacuates air in the gap between the two layers of films to form bonding, so that the optical performance of the composite brightness enhancement film is enhanced; through practical tests, the optical brightness can reach 260% of gain, and the optical brightness is not reduced.
And 4) performing second UV curing, specifically, further performing photopolymerization on 80-90% of polymerizable chemical bonds in the pressure-sensitive release coating, and further forming the pressure-sensitive release coating into a sealing bonding layer with high bonding property.
A special ultraviolet curing adhesive for preparing the enhanced light-gathering prism film or the backlight module is prepared from the following components in parts by weight:
60-70 parts of polyacrylate UV resin solution, 25-35 parts of acrylate reactive diluent, 1-5 parts of photoinitiator, 0.1-5 parts of filler and 0.1-5 parts of auxiliary agent.
The preparation method of the polyacrylate UV resin solution comprises the following steps:
the preparation method of the polyacrylate UV resin solution comprises the following steps:
A) adding 150 ml of toluene into a 500 ml four-neck flask provided with a thermometer, a condenser and a stirring device, and raising the temperature of a flask solution to 70-90 ℃;
B) weighing the components according to the set mass ratio, namely isobutyl acrylate: methyl methacrylate: hexafluorobutyl acrylate: hydroxyethyl acrylate: n-dodecyl mercaptan: azobisisobutyronitrile = (6-8): (2-4): (1-2): (0.5-1): 0.1: (0.3-0.6), uniformly mixing an acrylate soft monomer, an acrylate hard monomer, an acrylate functional monomer, hydroxyl acrylate, n-dodecyl mercaptan (NDM) and Azobisisobutyronitrile (AIBN) to obtain a mixed solution, and putting the mixed solution into a titration funnel;
C) slowly dripping the mixed solution in the titration funnel into a four-neck flask, stirring and dripping, finishing dripping within 3-3.5 hours, and then preserving heat at 80 ℃ for 3 hours to react completely;
D) adding sodium sulfite accounting for 5% of the total mass of reactants, stirring and reacting at 70-80 ℃ for 15-30 minutes, and reducing the residual azodiisobutyronitrile;
E) and finally adding a polymerization inhibitor accounting for 0.1 percent of the mass of the total reactants, adding acrylic acid accounting for 1.05 times of the mole number of the hydroxyl acrylate, simultaneously adding a solid acid catalyst accounting for 0.1 percent of the mass of the total reactants, raising the temperature to the reflux temperature, then refluxing and dividing water, stopping the reaction when the detected water yield reaches the water accounting for 0.98 times of the mole number of the hydroxyl acrylate, pouring out the solution, and removing solids through suction filtration to obtain the polyacrylate UV resin solution.
Wherein the ratio of the acrylate soft monomer to the acrylate hard monomer in the step B is 8: 2-6: 4, the acrylate functional monomer accounts for 10-20% of the total amount of the acrylate soft monomer and the acrylate hard monomer, and the hydroxyl acrylate accounts for 5-10% of the total amount of the acrylate soft monomer and the acrylate hard monomer.
The acrylate soft monomer in the step B is at least one of butyl acrylate, isobutyl acrylate, isooctyl acrylate and octadecyl acrylate; the acrylate hard monomer is at least one of methyl (methyl) acrylate, isobornyl (methyl) acrylate and acetoacetic acid glycol diester methacrylate.
The acrylate functional monomer in the step B is fluorine-containing acrylate, and specifically is one or more of trifluoroethyl (meth) acrylate, hexafluorobutyl (meth) acrylate, dodecafluoroheptyl (meth) acrylate and tridecafluoroctyl (meth) acrylate.
The hydroxy acrylate in the step B is at least one of hydroxyethyl acrylate, hydroxyethyl methacrylate, hydroxypropyl acrylate and hydroxypropyl methacrylate; the polymerization inhibitor is at least one of hydroquinone, p-hydroxyanisole, 2, 5-dimethyl hydroquinone and 1, 4-naphthalenediol; the solid acid catalyst is at least one of amberlyst15, amberlyst35, amberlyst36, amberlyst45, amberlyst21, amberlyst26 and NKC-9 macroporous strong acid cation exchange resin catalyst.
The special ultraviolet curing adhesive adopts at least one of acrylate reactive diluents, namely lauryl (methyl) acrylate, 2-phenoxyethyl (methyl) acrylate, ethoxylated phenoxyl (methyl) acrylate, trimethylcyclohexyl (methyl) acrylate, ethoxyethoxyethyl (methyl) acrylate, tetrahydrofurfuryl (methyl) acrylate, stearate (methyl) acrylate, decyl (methyl) acrylate and isobornyl (methyl) acrylate; the photoinitiator is at least one of 1-hydroxycyclohexyl phenyl ketone, 2-hydroxy-2-methyl-1-phenyl-1-acetone, 2-dimethoxy-2-phenyl acetophenone, 2,4, 6-trimethylbenzoyl-diphenyl phosphine oxide and tetra (2, 4-di-tert-butylphenyl) -4, 4' -biphenyl diphosphite; the filler is at least one of polymer elastic particles; the auxiliary agent is at least one of a wetting dispersant, a defoaming agent and a flatting agent; the wetting dispersant is acrylate polymer; the defoaming agent is organosilicon or acrylate polymer; the leveling agent is organic silicon.
The special ultraviolet curing adhesive adopts at least one of 2-phenoxyethyl (methyl) acrylate and isobornyl (methyl) acrylate as an acrylate reactive diluent; the photoinitiator is 1-hydroxycyclohexyl phenyl ketone and 2,4, 6-trimethylbenzoyl-diphenyl phosphine oxide; the filler is polymethyl methacrylate elastic particles; the auxiliary agent is at least one of organic silicon polymer and acrylate polymer.
The preparation method of the special ultraviolet curing adhesive comprises the following steps:
according to the weight parts, 60-70 parts of polyacrylate UV resin solution, 25-35 parts of acrylate reactive diluent, 1-5 parts of photoinitiator, 0.1-5 parts of filler and 0.1-5 parts of auxiliary agent are respectively prepared, the components are sequentially placed in a mixer, after the components are uniformly stirred, the mixture is vacuumized and stirred until no bubbles exist, and after the mixture is stood to room temperature, the special ultraviolet curing adhesive is obtained.
Further, the prepared special ultraviolet curing adhesive is put into a black or dark ultraviolet-tight package for sealed storage and is stored at room temperature.
As a self-made component of the present invention, an embodiment of the preparation of polyacrylate UV resin solution A1-A3 is as follows:
self-made component synthesis example a 1:
synthesis of polyacrylate UV resin solution a1, comprising the following steps:
adding 150 ml of toluene into a 500 ml four-neck flask provided with a thermometer, a condenser and a stirring device, and raising the temperature of a flask solution to 70-90 ℃;
weighing and uniformly mixing isobutyl acrylate, methyl methacrylate, hexafluorobutyl acrylate, hydroxyethyl acrylate, n-dodecyl mercaptan and azobisisobutyronitrile in a mass ratio of 8:2:1:0.5:0.1:0.3, putting the mixture into a titration funnel, slowly dropwise adding the mixed solution into a four-neck flask while stirring, completing dropwise addition within 3-3.5 hours, and then preserving heat at 80 ℃ for 3 hours to completely react. Adding sodium sulfite accounting for 5% of the total mass of reactants, stirring and reacting at 70-80 ℃ for 15-30 minutes, and reducing the residual azodiisobutyronitrile;
and finally, adding 0.1 part by mass of p-hydroxyanisole of the total reactants, adding 1.05 times of mole number of acrylic acid of hydroxyl acrylate, simultaneously adding 0.1% by mass of solid acid catalyst amberlyst15 of the total reactants, raising the temperature to the reflux temperature, then refluxing and dividing water, stopping the reaction when the detected water yield reaches 0.98 times of mole number of water of the hydroxyl acrylate, pouring out the solution, and removing solids through suction filtration to obtain the polyacrylate UV resin solution A1.
Self-made component synthesis example a 2:
synthesis of polyacrylate UV resin solution a2, comprising the following steps:
adding 150 ml of toluene into a 500 ml four-neck flask provided with a thermometer, a condenser and a stirring device, and raising the temperature of a flask solution to 70-90 ℃;
weighing and uniformly mixing octadecyl acrylate, isobornyl acrylate, dodecafluoroheptyl acrylate, hydroxypropyl acrylate, n-dodecyl mercaptan and azobisisobutyronitrile in a mass ratio of 6:4:2:1:0.1:0.5, putting the mixture into a titration funnel, slowly dropwise adding the mixed solution into a four-neck flask while stirring, dropwise adding within 3-3.5 hours, and then preserving heat at 80 ℃ for 3 hours to completely react. Adding sodium sulfite with the mass of 5 parts of the total reactants, stirring and reacting for 15-30 minutes at 70-80 ℃, and reducing the residual azodiisobutyronitrile. And finally, adding hydroquinone of which the mass is 0.1 part of that of the total reactants, adding acrylic acid of which the mole number is 1.05 times that of the hydroxyl acrylate, simultaneously adding a solid acid catalyst NKC-9 macroporous strong-acid cation exchange resin of which the mass is 0.1 part of that of the total reactants, raising the temperature to the reflux temperature, refluxing and dividing water, stopping the reaction when the detected water yield reaches the water of which the mole number is 0.98 times that of the hydroxyl acrylate, pouring out the solution, and removing solids through suction filtration to obtain the polyacrylate UV resin solution A2.
Self-made component synthesis example a 3:
synthesis of polyacrylate UV resin solution a3, comprising the following steps:
adding 150 ml of toluene into a 500 ml four-neck flask provided with a thermometer, a condenser and a stirring device, and raising the temperature of a flask solution to 70-90 ℃;
the preparation method comprises the steps of weighing and uniformly mixing isooctyl acrylate, methyl acrylate, tridecyl fluoro octyl acrylate, hydroxyethyl acrylate, n-dodecyl mercaptan and azobisisobutyronitrile according to the mass ratio of 7:3:1.2:0.8:0.1:0.6, putting the mixture into a titration funnel, slowly dripping the mixed solution into a four-neck flask, stirring and dripping the mixed solution, finishing dripping within 3-3.5 hours, and then preserving heat at 80 ℃ for 3 hours to completely react. Adding sodium sulfite with the mass of 5 parts of the total reactants, stirring and reacting for 15-30 minutes at 70-80 ℃, and reducing the residual azodiisobutyronitrile. And finally, adding 0.1 part by mass of p-hydroxyanisole of the total reactants, adding 1.05 times of mole number of acrylic acid of hydroxyl acrylate, simultaneously adding 0.1 part by mass of solid acid catalyst amberlyst36 of the total reactants, raising the temperature to the reflux temperature, then refluxing and dividing water, stopping the reaction when the detected water yield reaches 0.98 times of mole number of water of the hydroxyl acrylate, pouring out the solution, and removing solids through suction filtration to obtain the polyacrylate UV resin solution A3.
Example 2:
referring to fig. 3, the reinforced condensing prism film, the backlight module, the special ultraviolet curing adhesive and the preparation method thereof according to the embodiment of the present invention are basically the same as those of embodiment 1, except that:
the enhanced condensing prism film 8, the lens unit 84 that sets up on the substrate layer income plain noodles one side sets up the cylindrical counter bore 87 that the diameter is the same, communicates each other that the base plane is sunken to the inboard from the substrate layer income plain noodles in plane one side of spherical cap shape counter bore 89, spherical cap shape counter bore 89 sets up in the front portion of cylindrical counter bore 87, the one side that is close to the plain noodles, form compound cylindrical counter bore after the two communicates, pack special ultraviolet curing adhesive 88 in this compound cylindrical counter bore after, the cylindrical lens unit that forms.
The diameter of a cylindrical counter bore 87 of the prism unit of the strengthened condensing prism film 8 is 40-60% of the width of the root of the bulge 85 of the single prism unit, and the depth of the strengthened condensing prism film is 20-30% of the thickness from the bottom surface of the base material to the top end of the bulge 85 of the prism unit; the distance between the centers of the two adjacent cylindrical counter bores 87 is 150-200% of the diameter of the counter bores; the cylindrical counter bore 87 is completely filled with a special ultraviolet light curing adhesive 88 to form a cylindrical lens unit (and a lens unit). The connecting line of the circle centers of the cylindrical counterbores 87 and the connecting line of the top ends of the tooth-shaped convex parts 85 of the corresponding prism units 83 are overlapped with each other in the top view of the three-dimensional space.
In this embodiment, the upper layer prism film of the composite brightness enhancement film 4 is an upper layer film, and the lower layer prism film is a lower layer film; the lower prism film is a strengthened condensing prism film 8.
Through practical tests, the enhanced light-gathering prism film 8 provided by the embodiment of the invention has the advantage that the light-gathering effect is improved by 1.4-1.7 times compared with that of the existing common prism film through twice light gathering.
The special ultraviolet curing adhesive B1 and the preparation method thereof comprise the following steps:
respectively preparing and accurately weighing: 170 g of polyacrylate UV resin solution A, 15 g of 2-phenoxyethyl acrylate, 10 g of isobornyl acrylate, 1.5 g of photoinitiator 1-hydroxycyclohexyl phenyl ketone, 0.5 g of photoinitiator 2,4, 6-trimethylbenzoyl-diphenyl phosphine oxide, 21000.8 g of a leveling agent Wingchuang Texsai Glide, 17900.2 g of a defoaming agent, and 2.0 g of polymethyl methacrylate particles (Japanese Hodgkin chemical KMR-3 EA); the components are sequentially added into a double-planetary power mixer, are uniformly mixed and stirred, are stirred while vacuumizing until the components are completely and uniformly stirred and are free of bubbles, are naturally kept to room temperature to obtain the special ultraviolet curing adhesive, are filled into a black or deep ultraviolet-impermeable package, are sealed and stored, and are stored at room temperature.
Example 3:
the enhanced condensing prism film, the backlight module, the special ultraviolet curing adhesive and the preparation method thereof provided by the embodiment are basically the same as those of the embodiments 1 and 2, and the difference is that:
the upper layer prism film of the composite brightness enhancement film 4 is an upper layer film, and the lower layer prism film is a lower layer film; wherein, the upper layer prism film and the lower layer prism film are both strengthened condensing prism films 8.
The special ultraviolet curing adhesive B2 and the preparation method thereof comprise the following steps:
the polyacrylate UV resin solution A was weighed accurately to obtain 260 g, 30 g of 2-phenoxyethyl acrylate, 2.5 g of photoinitiator 1-hydroxycyclohexyl phenyl ketone, 0.5 g of photoinitiator 2,4, 6-trimethylbenzoyl-diphenyl phosphine oxide, 92001.5 g of leveling agent MODAFLOW, Zhan New in USA, 42000.5 g of antifoaming agent Dehydran, and 5.0 g of methyl methacrylate particles (KMR-3 TA, Japan Hokko chemical). The components are sequentially added into a double-planetary power mixer, are uniformly mixed and stirred, are stirred while vacuumizing until the components are completely and uniformly stirred and are free of bubbles, are naturally kept to room temperature to obtain the special ultraviolet curing adhesive, are filled into a black or deep ultraviolet-impermeable package, are sealed and stored, and are stored at room temperature.
Example 4:
the enhanced condensing prism film, the backlight module, the special ultraviolet curing adhesive and the preparation method thereof provided by the embodiment are basically the same as those of the embodiments 1 to 3, and the differences are as follows:
the ultraviolet curing adhesive B3 and the preparation method thereof comprise the following steps:
365 g of the polyacrylate UV resin solution A, 15 g of 2-phenoxyethyl acrylate, 12 g of isobornyl acrylate, 3.0 g of photoinitiator 1-hydroxycyclohexyl phenyl ketone, 4.0 g of polymer elastic particles 5070D (Japanese Dai refinement) and 21001.0 g of leveling agent MODAFLOW was accurately weighed. Sequentially adding the components into a double-planetary power mixer, mixing and stirring uniformly, vacuumizing and stirring until the components are completely stirred uniformly and have no bubbles, naturally standing to room temperature to obtain the ultraviolet curing adhesive, filling the ultraviolet curing adhesive into a black or dark ultraviolet-impermeable package, sealing and storing the package at room temperature.
Example 5:
the enhanced condensing prism film, the backlight module, the special ultraviolet curing adhesive and the preparation method thereof provided by the embodiment are basically the same as those of the embodiments 1 to 4, and the differences are as follows:
the ultraviolet curing adhesive B4 and the preparation method thereof comprise the following steps:
polyacrylate UV resin solution A165 g, 2-phenoxyethyl acrylate 10 g, ethoxylated phenoxyacrylate 15 g, photoinitiator 1-hydroxycyclohexyl phenyl ketone 2.0 g, photoinitiator 2,4, 6-trimethylbenzoyl-diphenylphosphine oxide 1.0 g, wetting dispersant Lanco TF 17252.0 g, and methyl methacrylate particles (Japanese waterlogging Techpolymer microsphere MB 20X-5) 5.0 g are accurately weighed. The components are sequentially added into a double-planetary power mixer, are uniformly mixed and stirred, are stirred while vacuumizing until the components are completely and uniformly stirred and are free of bubbles, are naturally kept to room temperature to obtain the special ultraviolet curing adhesive, are filled into a black or deep ultraviolet-impermeable package, are sealed and stored, and are stored at room temperature.
Example 6:
the enhanced condensing prism film, the backlight module, the special ultraviolet curing adhesive and the preparation method thereof provided by the embodiment are basically the same as those of the embodiments 1 to 5, and the differences are as follows:
the ultraviolet curing adhesive B5 and the preparation method thereof comprise the following steps:
270 g of polyacrylate UV resin solution A, 10 g of isobornyl methacrylate, 15 g of 2-phenoxyethyl acrylate, 1.0 g of photoinitiator 1-hydroxycyclohexyl phenyl ketone, 81.0 g of defoaming agent Perenol E, 3501.0 g of cyanogen EB leveling agent and 2.0 g of methyl methacrylate particles (Japanese Hokko chemical KMR-3 TA) are accurately weighed. The components are sequentially added into a double-planetary power mixer, are uniformly mixed and stirred, are stirred while vacuumizing until the components are completely and uniformly stirred and are free of bubbles, are naturally kept to room temperature to obtain the special ultraviolet curing adhesive, are filled into a black or deep ultraviolet-impermeable package, are sealed and stored, and are stored at room temperature.
Example 7:
the enhanced condensing prism film, the backlight module, the special ultraviolet curing adhesive and the preparation method thereof provided by the embodiment are basically the same as those of the embodiments 1 to 6, and the differences are as follows:
the ultraviolet curing adhesive B6 and the preparation method thereof comprise the following steps:
360 g of polyacrylate UV resin solution A, 25 g of tetrahydrofurfuryl acrylate, 10 g of ethoxy ethyl acrylate, 1.0 g of photoinitiator 1-hydroxycyclohexyl phenyl ketone, 21001.0 g of leveling agent Zhan model MODAFLOW, 17900.2 g of defoaming agent BYK, and 2.8 g of methyl methacrylate particles (Guangdong Haiyang powder PMMA microspheres HY-MP 90) are accurately weighed. Sequentially adding the components into a double-planetary power mixer, mixing and stirring uniformly, vacuumizing and stirring until the components are completely stirred uniformly and have no bubbles, naturally standing to room temperature to obtain the ultraviolet curing adhesive, filling the ultraviolet curing adhesive into a black or dark ultraviolet-impermeable package, sealing and storing the package at room temperature.
Comparative example 1: preparation of UV-curing adhesive C1
A commercially available polyurethane modified acrylate (manufactured by Taiwan Changxing company, brand 61363) is accurately weighed 65 g, isobornyl methacrylate 10 g, 2-phenoxyethyl acrylate 15 g, photoinitiator 1-hydroxycyclohexyl phenyl ketone 1.0 g, photoinitiator 2,4, 6-trimethylbenzoyl-diphenyl phosphine oxide 2.0 g, a flatting agent is Yingchungsai Glide Rad 21001.8 g, a defoaming agent BYK 17900.2 g and methyl methacrylate particles (Japanese ponding Techpolymer microspheres MB 20X-5) 5.0 g. The components are sequentially added into a double-planetary power mixer, are uniformly mixed and stirred, are stirred while vacuumizing until the components are completely and uniformly stirred and are free of bubbles, are naturally kept to room temperature to obtain the ultraviolet curing adhesive, and are packaged into a black or deep ultraviolet-impermeable package for sealing and storage, and the ultraviolet curing adhesive is stored at room temperature.
Comparative example 2: preparation of UV-curing adhesive C2
A commercially available polyacrylate UV resin (manufactured by Changxing corporation, Taiwan, brand 65331) 65 g, 2-phenoxyethyl acrylate 20 g, isobornyl acrylate 10 g, photoinitiator 1-hydroxycyclohexyl phenyl ketone 2.0 g, photoinitiator 2,4, 6-trimethylbenzoyl-diphenylphosphine oxide 1.0 g, wetting dispersant Lanco TF 17251.0 g, and methyl methacrylate particles (Japanese ponding Techpolymer microsphere MB 20X-5) 1.0 g were accurately weighed. The components are sequentially added into a double-planetary power mixer, are uniformly mixed and stirred, are stirred while vacuumizing until the components are completely and uniformly stirred and are free of bubbles, are naturally kept to room temperature to obtain the ultraviolet curing adhesive, and are packaged into a black or deep ultraviolet-impermeable package for sealing and storage, and the ultraviolet curing adhesive is stored at room temperature.
In the following methods, the release performance of the ultraviolet curing adhesive in the backlight module after the first UV curing and the bonding force of the ultraviolet curing adhesive after the second UV curing are tested and implemented 2-7 and in the comparative examples 1-2. The sample preparation method comprises the following steps: diluting the ultraviolet curing adhesive of each embodiment to proper viscosity by butyl acetate, coating the adhesive on the back of the upper layer film by a 10-micron wire bar coater, baking the adhesive in a baking oven at 90 ℃ for 3-5 minutes to remove the solvent, and then curing by first ultraviolet light (a common high-pressure mercury lamp, the curing energy is 10-50 mJ/cm)2) Thereafter, the release property was tested. The release effect is good, no residual glue is marked as OK, otherwise, the residual glue is marked as NG.
Then the pressure-sensitive release coating of the upper film is bonded with the prism surface of the lower film through rolling, the rolling pressure intensity is set to be 0.3-0.5 MPa, and a common high-pressure mercury lamp and high curing energy, namely ultraviolet irradiation intensity are synchronously used to be 800-1000 mJ/cm2A second UV cure was performed to form a sealing adhesive layer with high adhesion, and then the T peel force was tested.
The T peeling force is directly tested, the unit is N/25mm, the T-type peeling strength test method of GB/T2791-. The test results are shown in table 1:
TABLE 1 Performance index of the UV-curable adhesive
Figure 963803DEST_PATH_IMAGE001
As can be seen from table 1, in the backlight module prepared in examples 2 to 7, the special UV-curable adhesive is coated on the upper film (the back of the upper diffusion film or the back of the prism layer of the brightness enhancement film) on the back, and after the first UV curing, the coating has pressure sensitivity only when the pressure range of the rolling is greater than or equal to 0.3MPa, but has release and anti-sticking properties under the pressure lower than the pressure, and can be directly rolled without additionally coating a protective film; the upper film is uncoiled and then rolled to enable the back coated UV adhesive surface to be attached to the prism layer of the lower brightness enhancement film, the rolling pressure range is set to be 0.3-0.5 MPa (if the rolling pressure is too small, the pressure-sensitive release coating does not have pressure-sensitive property, if the rolling pressure is too large, the prism layer structure of the brightness enhancement film can be damaged), after the second UV curing, the two films can be firmly bonded to form an optical module, the performance of each aspect is excellent, the requirements of protecting, bonding and sealing can be met, the optical performance of the gain composite brightness enhancement film is improved, the overall thickness of the backlight module is reduced, the process flow is simplified, and the like.
In the embodiments of the present invention, the components and the specific ratios are not listed one by one, and in other embodiments, the specific selection may be performed according to the range and the actual requirement recorded in the present invention, so that the technical effects recorded in the present invention can be achieved.
The above embodiments are preferred embodiments of the present invention, but the present invention is not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be construed as equivalents thereof, and all such changes, modifications, substitutions, combinations, and simplifications are intended to be included in the scope of the present invention.

Claims (16)

1. A strengthened light-gathering prism film is characterized by comprising a substrate layer, wherein the substrate layer comprises a light-in surface and a light-out surface, the light-in surface and the light-out surface are respectively provided with a light-gathering micro-structural layer, the light-gathering micro-structural layer comprises prism units arranged on the light-out surface and lens units arranged on the light-in surface, and all the units are regularly arranged from inside to outside in a Fresnel mode; the prism unit is formed by a tooth-shaped convex part and a tooth-shaped concave part which extend out of the base surface to the outside; the lens unit is a plano-convex lens formed by a spherical-crown-shaped counter bore which is arranged on the light incident surface of the substrate layer and is concave to the inner side of the base plane and a special ultraviolet light curing adhesive which is filled in the spherical-crown-shaped counter bore, the convex surface of the lens unit faces the light emergent surface, the plane of the lens unit faces the light incident surface, and the lens unit is regularly arranged on the back surface of the convex part of the prism unit at; and special ultraviolet curing adhesives are filled in the spherical crown-shaped counter bores of the lens units, and the light path of the prism film is adjusted through the plano-convex lens formed by the special ultraviolet curing adhesives: the lens unit performs primary light collection, and the prism unit performs secondary light collection, so as to enhance the optical gain of the prism film.
2. The film of claim 1, wherein each spherical-cap-shaped counter bore of the lens unit has a diameter of 40-60% of the root width of the protrusion of the single prism unit and a depth of 10-15% of the thickness from the bottom surface of the substrate to the top end of the protrusion of the prism unit; the distance between the centers of two adjacent spherical crown counter bores is 150-200% of the diameter of the two adjacent spherical crown counter bores; the spherical crown shaped counter bore is completely filled with a special ultraviolet light curing adhesive.
3. The strengthened light-gathering prism film as claimed in claim 1, wherein the lens unit disposed on one side of the light incident surface of the substrate layer is a cylindrical counter bore which is disposed on one side of the plane of the spherical counter bore and has the same diameter and is recessed from the light incident surface of the substrate layer to the inner side of the base surface, the cylindrical counter bore is disposed in front of the cylindrical counter bore and is close to one side of the light emergent surface, the cylindrical counter bore and the cylindrical counter bore are connected to form a composite cylindrical counter bore, and the cylindrical lens unit is formed after the composite cylindrical counter bore is filled with a special ultraviolet light curing adhesive.
4. The enhanced light-gathering prism film as claimed in claim 3, wherein the diameter of the cylindrical counter bore of the prism unit is 40-60% of the width of the root of the protrusion of the prism unit, and the depth is 20-30% of the thickness from the bottom surface of the substrate to the top end of the protrusion of the prism unit; the distance between the centers of two adjacent cylindrical counter bores is 150-200% of the diameter of the counter bores; the composite cylindrical counter bore is completely filled with a special ultraviolet curing adhesive.
5. A backlight module comprising the enhanced light-gathering prism film as recited in any one of claims 1 to 4, characterized in that it comprises a backlight plate (1), a reflector plate (2), a light guide plate (3), a composite brightness enhancement film (4) and a backlight source (5) arranged on the side of the light guide plate (3) in sequence from front to back; the composite brightness enhancement film (4) comprises at least two films of an upper diffusion film, an upper prism film and a lower prism film which are sequentially stacked up and down, and the two films are bonded by adopting a special ultraviolet curing adhesive to form a release/bonding layer with high light transmittance; at least one layer of the upper layer prism film or the lower layer prism film is the strengthened light-gathering prism film (8); the special ultraviolet light curing adhesive is coated on the back surface of the upper layer film, forms a pressure-sensitive release coating after the first UV curing, and is directly wound; after the upper film is uncoiled, the pressure-sensitive release coating coated on the back is adhered to the prism surface of the lower film through rolling, and the second UV curing is synchronously carried out, so that the pressure-sensitive release coating is formed into a sealing bonding layer; the sealing bonding layer evacuates air in a gap between the two layers of films to form bonding, so that the optical performance of the composite brightness enhancement film is enhanced; wherein the first UV curing is ultraviolet irradiation intensity of 10-50 mJ/cm2The second UV curing is ultraviolet irradiation intensity of 800-1000 mJ/cm2High energy curing of (2).
6. The backlight module as claimed in claim 5, wherein the preparation of the enhanced condensing prism film comprises the steps of:
1) respectively preparing an upper diffusion film, an upper layer prism film, a lower layer prism film and a special ultraviolet curing adhesive;
2) diluting the special ultraviolet curing adhesive to a set viscosity by using a solvent, uniformly coating the special ultraviolet curing adhesive on the back surface of the upper layer film by using a precision coating machine, baking the special ultraviolet curing adhesive in a drying tunnel at the temperature of 80-90 ℃ for a set time, and removing the solvent from the coating to form a back surface adhesive coating;
3) the back adhesive coating is coated by using a common high-pressure mercury lamp and low curing energy, namely ultraviolet irradiation intensity of 10-50 mJ/cm2Carrying out first UV curing to enable partial chemical bonds in the coating material to react and form a pressure-sensitive release coating on the back surface of the upper layer film, wherein the pressure-sensitive release coating has pressure sensitivity under the pressure of not less than 0.3MPa and has anti-sticking performance under the pressure of not less than 0.3MPa, and the upper layer film is directly rolled without externally covering a protective film;
4) uncoiling the upper layer film coated with the pressure-sensitive release coating, enabling the pressure-sensitive release coating coated on the back of the upper layer film to be attached to the prism surface of the lower layer film through rolling, enabling the pressure-sensitive release coating to generate pressure-sensitive viscosity within the rolling pressure range of 0.3-0.5 MPa, and synchronously using a common high-pressure mercury lamp and high curing energy, namely ultraviolet irradiation intensity of 800-1000 mJ/cm2Carrying out secondary UV curing to ensure that chemical bonds in the pressure-sensitive release coating continuously react to form a sealing bonding layer with high bonding property, and tightly bonding the upper layer of film and the lower layer of film together to finish the preparation of the double-layer composite brightness enhancement film; the sealing bonding layer simultaneously evacuates air in a gap between the two layers of films and forms bonding, thereby enhancing the optical performance of the composite brightness enhancement film.
7. The backlight module according to claim 5,
one of the upper diffusion film or the upper layer prism film in the step 1) is an upper layer film, and one of the upper layer prism film or the lower layer prism film is a lower layer film;
the solvent in the step 2) is butyl acetate, the walking speed is 20-25 m/min in a drying tunnel at the temperature of 80-90 ℃, and the baking time is set to be 1-3 minutes, so that the solvent is removed from the coating;
the pressure-sensitive release coating in the step 3) has pressure sensitivity only when the pressure of rolling is not less than 0.3MPa, and has anti-sticking performance when the pressure is less than the pressure; in the first UV curing process, 10-20% of polymerizable chemical bonds in the special ultraviolet curing adhesive are subjected to photopolymerization reaction, so that the coating forms a pressure-sensitive release coating without adhesiveness under low pressure;
and 4) carrying out second UV curing to further carry out photopolymerization on 80-90% of polymerizable chemical bonds in the pressure-sensitive release coating so as to further form the pressure-sensitive release coating into a sealing bonding layer with high bonding property.
8. The special ultraviolet curing adhesive for preparing the enhanced light-gathering prism film as claimed in any one of claims 1 to 4 or the backlight module as claimed in any one of claims 5 to 7 is characterized by being prepared from the following components in parts by weight:
60-70 parts of polyacrylate UV resin solution, 25-35 parts of acrylate reactive diluent, 1-5 parts of photoinitiator, 0.1-5 parts of filler and 0.1-5 parts of auxiliary agent.
9. The special ultraviolet light curing adhesive as claimed in claim 8, wherein the preparation of the polyacrylate UV resin solution comprises the following steps:
A) adding 150 ml of toluene into a 500 ml four-neck flask provided with a thermometer, a condenser and a stirring device, and raising the temperature of a flask solution to 70-90 ℃;
B) weighing the components, namely isobutyl acrylate, according to the following set mass ratio: methyl methacrylate: hexafluorobutyl acrylate: hydroxyethyl acrylate: n-dodecyl mercaptan: azobisisobutyronitrile = (6-8): (2-4): (1-2): (0.5-1): 0.1: (0.3-0.6), uniformly mixing an acrylate soft monomer, an acrylate hard monomer, an acrylate functional monomer, hydroxyl acrylate, n-dodecyl mercaptan (NDM) and Azobisisobutyronitrile (AIBN) to obtain a mixed solution, and putting the mixed solution into a titration funnel;
C) slowly dripping the mixed solution in the titration funnel into a four-neck flask, stirring and dripping, finishing dripping within 3-3.5 hours, and then preserving heat at 80 ℃ for 3 hours to react completely;
D) adding sodium sulfite accounting for 5% of the total mass of reactants, stirring and reacting at 70-80 ℃ for 15-30 minutes, and reducing the residual azodiisobutyronitrile;
E) and finally adding a polymerization inhibitor accounting for 0.1 percent of the mass of the total reactants, adding acrylic acid accounting for 1.05 times of the mole number of the hydroxyl acrylate, simultaneously adding a solid acid catalyst accounting for 0.1 percent of the mass of the total reactants, raising the temperature to the reflux temperature, then refluxing and dividing water, stopping the reaction when the detected water yield reaches the water accounting for 0.98 times of the mole number of the hydroxyl acrylate, pouring out the solution, and removing solids through suction filtration to obtain the polyacrylate UV resin solution.
10. The special ultraviolet light curing adhesive according to claim 9, characterized in that: the ratio of the acrylate soft monomer to the acrylate hard monomer in the step B is 8: 2-6: 4, the acrylate functional monomer accounts for 10-20% of the total amount of the acrylate soft monomer and the acrylate hard monomer, and the hydroxyl acrylate accounts for 5-10% of the total amount of the acrylate soft monomer and the acrylate hard monomer.
11. The special ultraviolet light curing adhesive according to claim 9, characterized in that: the acrylate soft monomer in the step B is at least one of butyl acrylate, isobutyl acrylate, isooctyl acrylate and octadecyl acrylate; the acrylate hard monomer is at least one of methyl (methyl) acrylate, isobornyl (methyl) acrylate and acetoacetic acid glycol diester methacrylate.
12. The special ultraviolet light curing adhesive according to claim 9, characterized in that: the acrylate functional monomer in the step B is fluorine-containing acrylate and is one or more of trifluoroethyl (meth) acrylate, hexafluorobutyl (meth) acrylate, dodecafluoroheptyl (meth) acrylate and tridecafluoroctyl (meth) acrylate.
13. The special ultraviolet light curing adhesive according to claim 9, characterized in that: the hydroxy acrylate in the step B is at least one of hydroxyethyl acrylate, hydroxyethyl methacrylate, hydroxypropyl acrylate and hydroxypropyl methacrylate; the polymerization inhibitor is at least one of hydroquinone, p-hydroxyanisole, 2, 5-dimethyl hydroquinone and 1, 4-naphthalenediol; the solid acid catalyst is at least one of amberlyst15, amberlyst35, amberlyst36, amberlyst45, amberlyst21, amberlyst26 and NKC-9 macroporous strong acid cation exchange resin catalyst.
14. The special ultraviolet light curing adhesive as claimed in claim 8, wherein: the acrylate reactive diluent is at least one of lauryl (meth) acrylate, 2-phenoxyethyl (meth) acrylate, ethoxylated phenoxy (meth) acrylate, trimethylcyclohexyl (meth) acrylate, ethoxyethoxyethyl (meth) acrylate, tetrahydrofurfuryl (meth) acrylate, stearyl (meth) acrylate, decyl (meth) acrylate and isobornyl (meth) acrylate; the photoinitiator is at least one of 1-hydroxycyclohexyl phenyl ketone, 2-hydroxy-2-methyl-1-phenyl-1-acetone, 2-dimethoxy-2-phenyl acetophenone, 2,4, 6-trimethylbenzoyl-diphenyl phosphine oxide and tetra (2, 4-di-tert-butylphenyl) -4, 4' -biphenyl diphosphite; the filler is at least one of polymer elastic particles; the auxiliary agent is at least one of a wetting dispersant, a defoaming agent and a flatting agent.
15. The uv curable adhesive according to claim 8, wherein: the acrylate reactive diluent is at least one of 2-phenoxyethyl (methyl) acrylate and isobornyl (methyl) acrylate; the photoinitiator is 1-hydroxycyclohexyl phenyl ketone and 2,4, 6-trimethylbenzoyl-diphenyl phosphine oxide; the filler is polymethyl methacrylate elastic particles; the auxiliary agent is at least one of organic silicon polymer and acrylate polymer.
16. The method for preparing the special ultraviolet curing adhesive as described in any one of claims 8 to 15, which is characterized by comprising the following steps:
the ultraviolet curing adhesive is prepared by respectively preparing the components, weighing 60-70 parts of polyacrylate UV resin, 25-35 parts of acrylate reactive diluent, 1-5 parts of photoinitiator, 0.1-5 parts of filler and 0.1-5 parts of auxiliary agent according to the following weight parts, sequentially putting the components into a mixer, uniformly stirring, vacuumizing and stirring until no bubbles exist, and standing until room temperature is reached to obtain the special ultraviolet curing adhesive.
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