CN115201948A - Preparation method of diffusion film, diffusion film and application - Google Patents
Preparation method of diffusion film, diffusion film and application Download PDFInfo
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- CN115201948A CN115201948A CN202211112577.2A CN202211112577A CN115201948A CN 115201948 A CN115201948 A CN 115201948A CN 202211112577 A CN202211112577 A CN 202211112577A CN 115201948 A CN115201948 A CN 115201948A
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Classifications
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- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
- B05D3/06—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by exposure to radiation
- B05D3/061—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by exposure to radiation using U.V.
- B05D3/065—After-treatment
- B05D3/067—Curing or cross-linking the coating
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D5/00—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures
- B05D5/02—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures to obtain a matt or rough surface
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
- B05D7/02—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to macromolecular substances, e.g. rubber
- B05D7/04—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to macromolecular substances, e.g. rubber to surfaces of films or sheets
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
- B05D7/24—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials for applying particular liquids or other fluent materials
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D2201/00—Polymeric substrate or laminate
- B05D2201/02—Polymeric substrate
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D2502/00—Acrylic polymers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D2502/00—Acrylic polymers
- B05D2502/005—Acrylic polymers modified
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D2601/00—Inorganic fillers
- B05D2601/20—Inorganic fillers used for non-pigmentation effect
- B05D2601/22—Silica
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
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- Physics & Mathematics (AREA)
- Life Sciences & Earth Sciences (AREA)
- Wood Science & Technology (AREA)
- Manufacturing & Machinery (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Plasma & Fusion (AREA)
- Application Of Or Painting With Fluid Materials (AREA)
Abstract
The invention discloses a preparation method of a diffusion film, the diffusion film and application, and relates to the technical field of liquid crystal display. According to the invention, the UV type diffusion layer glue coating is coated on the release film with the concave-convex structure by using the micro-concave roller, the coating obtains good leveling on the surface of the release film to improve the coating uniformity by using the excellent smoothness and stripping property of the release film, and particles in the coating obtain better wet coating transfer rate and good distribution and improve the roughness of the coating surface by using the effect of the spherical structure on the release film; the coating is quickly cured under the action of a UV lamp and is anchored on the diffusion basement membrane to form a stable diffusion coating. The phenomenon of uneven surface particle distribution caused by glue viscosity, liquid flow fluctuation and particle agglomeration when the diffusion particles are distributed on the film surface during direct coating is solved, and the phenomenon of lamp shadow can be effectively prevented.
Description
Technical Field
The invention relates to the technical field of liquid crystal display, in particular to a preparation method of a diffusion film, the diffusion film and application.
Background
Because LCD screen display technology has advantages in aspects such as display brightness, durability, low manufacturing cost, etc., it has been widely used in life, and the backlight module in its structure provides the light source for its display, and in order to make the projected light more uniform and shield the defect points in the light transmission process softly, it is necessary to add a diffusion film in the backlight module. The light rays are refracted and reflected for many times in the diffusion film, so that the light rays greatly deviate from the incident angle when being emitted from the surface of the diffusion film, and the overall atomization optical effect is displayed. The diffusion film can be divided into upper diffusion and lower diffusion, the lower diffusion mainly shields flaw points in the light source, the upper diffusion mainly further diffuses the light emitting angle of the light source, and the atomization effect is improved.
At present, the main preparation methods of the diffusion membrane mainly comprise the following two methods:
(1) When the optical film is subjected to multilayer coextrusion molding, surface master batches of the film are modified or particles with diffusion effects are added for double-drawing preparation. The method has the advantages that the diffusion particles are added into the master batch of the film, the requirements on production stirring equipment and processes are very high when the diffusion particles are dispersed in the master batch, the uniform film is difficult to obtain, and simultaneously, the crystallinity of the film is changed when the film is stretched and formed due to the addition of the diffusion particles, so that the physical properties of the film such as thermal shrinkage, tensile strength, flatness and the like are difficult to meet the requirements.
(2) By applying a coating having a diffusing effect to the surface of the optical film, so as to achieve the effect of diffusion. Compared with the method (1), the method has more production convenience and adjustability, but the method adds the diffusion particles into the coating sizing material and then coats the surface of the base film, and because the diffusion particles are microspherical, the diffusion particles are easy to generate uneven dispersion such as agglomeration, swelling and the like in glue coating. In order to ensure that the diffusion film has sufficient brightness and proper haze, microspheres with large particle size and microspheres with medium and small particle size are often required to be added and blended in the coating, and the swelling and agglomeration phenomena of the microspheres after being added in the coating easily cause the proportion of the microspheres with small particle size in a unit area of the film surface to be reduced, and the integral average particle size is larger, so that the bad phenomena of lamp shadow and bright spots are caused.
In view of this, the invention is particularly proposed.
Disclosure of Invention
The invention aims to provide a preparation method of a diffusion film, the diffusion film and application, and aims to solve the problems of diffusion particle agglomeration, swelling, uneven distribution of a coating on a film surface and the like in the use process of a feed liquid in a surface coating type diffusion film and avoid the problems of lamp shadows, bright spots and dark lines of the diffusion film.
The invention is realized by the following steps:
in a first aspect, the present invention provides a method for producing a diffusion membrane, comprising:
coating the UV type diffusion layer glue coating on the surface of a release film with a concave-convex structure on the surface under the action of a micro-concave coating head so as to form a diffusion coating on the surface of the release film;
firstly, pre-curing the diffusion coating, then compounding the diffusion base film with the release film loaded with the diffusion coating, and completely curing by UV irradiation;
wherein, the UV type diffusion layer glue coating is prepared by uniformly mixing diffusion particles, a solvent, a dispersant, a UV type coating and an initiator.
In an optional embodiment, the micro concave roller comprises a bottom concave trough, the release film is attached to the micro concave roller, and the UV diffusion layer glue paint adsorbed on the micro concave roller is uniformly loaded on the surface of the release film in the operation process to form a diffusion coating;
preferably, during the diffusion coating process, the linear speed of the coating is controlled to be 10-25m/min;
preferably, the thickness of the release film is 25-250 μm, the release film is made of pet material, and the light transmittance is more than or equal to 85%;
preferably, the surface roughness Ra of the release film is 100-1000nm, more preferably 500-800nm;
preferably, the release film has a peel force of 20 to 50gf/25mm.
In an alternative embodiment, the process for preparing the UV type diffusion layer glue coating comprises: uniformly mixing the diffusion particles, a solvent and a dispersing agent in an ultrasonic oscillation mode to obtain a microsphere dispersion liquid, uniformly mixing the UV type coating and the microsphere dispersion liquid, and then adding an initiator to uniformly mix;
preferably, the frequency of ultrasonic oscillation is 15-70kHZ, and the ultrasonic oscillation time is 5-30min.
In an alternative embodiment, the diffusing particles are selected from at least one of PMMA microspheres and silica microspheres;
preferably, the average particle diameter of PMMA and the average particle diameter of silica diffusion particles are both 3-15 μm;
preferably, the diffusion particles may have particles having an average particle diameter of 3 to 5 μm in a proportion of 1 to 15% by weight, particles having an average particle diameter of 6 to 9 μm in a proportion of 3 to 25% by weight, and particles having an average particle diameter of 10 to 15 μm in a proportion of 60 to 96% by weight.
In an alternative embodiment, the UV type coating is a multifunctional acrylic polymer, and the mass ratio of the diffusing particles to the UV type coating is 1; the concentration of the diffusion particles in the UV type diffusion layer glue coating is 8% -16%;
preferably, the UV type coating is at least one selected from the group consisting of aliphatic alcohol hexaacrylate, aliphatic urethane diacrylate, polyester acrylate, pentaerythritol hexaacrylate, pentaerythritol triacrylate, fatty acid modified polyester hexaacrylate, and aliphatic urethane hexaacrylate.
In alternative embodiments, the solvent is selected from at least one of ethyl acetate, butyl acetate, and butanone;
preferably, the type of the initiator is selected from at least one of the initiator 184 and the initiator 1819, and the amount of the initiator is 2% -6%;
preferably, the dispersant is selected from at least one of BYK3575, BYKAT203, BYK104S, BYK103, BYK110, BYK163, efka PX 4350, efka 4560, efka PX 4780, efka PX 4785, efka PX 4787, efka 4609; the dosage of the dispersant is 0.3 to 2 percent.
In an optional embodiment, the diffusion coating is pre-cured through a drying tunnel, then the diffusion base film and the release film loaded with the diffusion coating are compounded under the action of a press roller, and curing is carried out after the diffusion base film and the release film are irradiated by a UV lamp; after curing, peeling off the release film at the winding end to obtain an optical diffusion film product;
preferably, the temperature of the drying tunnel is 70-110 ℃;
preferably, the intensity of UV irradiation is controlled to 200mj/cm during the complete curing process 2 -1000 mj/cm 2 The irradiation time is 10s-40s;
preferably, the pressure of the press roll for transfer coating is 50 ± 25N.
In alternative embodiments, the diffusion-based film is selected from pet films;
preferably, the pet film has a thickness of 75 μm to 200. Mu.m.
In a second aspect, the present invention provides a diffusion membrane produced by the production method according to any one of the preceding embodiments.
In a third aspect, the present invention provides the use of the diffuser film of the previous embodiment in the manufacture of an LCD screen.
The invention has the following beneficial effects: according to the invention, the UV type diffusion layer glue coating is coated on the release film with the concave-convex structure by using the micro-concave roller, the coating obtains good leveling on the surface of the release film by using the excellent smoothness and stripping property of the release film, so that the coating uniformity is improved, and meanwhile, the particles in the coating obtain better wet coating transfer rate and good distribution and the roughness of the coating surface is improved by using the effect of the concave-convex structure on the release film; under the effect of the UV lamp, the coating is quickly cured and anchored on the diffusion base film to form a stable diffusion coating, the surface is transferred with a structure bulge on the release film, the problem of uneven surface particle distribution caused by glue viscosity, liquid flow fluctuation and particle agglomeration when diffusion particles are distributed on the film surface during direct coating is solved, and the phenomenon of lamp shadow can be effectively prevented.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
FIG. 1 is a process flow diagram of a method for fabricating a diffusion barrier according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a diffusion film prepared according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below. The examples, in which specific conditions are not specified, were carried out according to conventional conditions or conditions recommended by the manufacturer. The reagents or instruments used are conventional products which are not indicated by manufacturers and are commercially available.
The embodiment of the invention provides a preparation method of a diffusion film, which comprises the following steps:
s1, preparation of UV type diffusion layer glue coating
And uniformly mixing the diffusion particles, the solvent, the dispersant, the UV type coating and the initiator to obtain the UV type diffusion layer glue coating. The types and amounts of the diffusion particles, the solvent, the dispersant, the UV type coating material and the initiator are not limited, and may be configured by referring to the coating material formulation of the conventional surface coating type diffusion film.
In order to further improve the mixing uniformity of the raw materials of the UV type diffusion layer glue coating, the mixing sequence and the mixing mode of the raw materials of the inventor are optimized: uniformly mixing the diffusion particles, the solvent and the dispersing agent in an ultrasonic oscillation mode to obtain microsphere dispersion liquid, uniformly mixing the UV type coating and the microsphere dispersion liquid, and then adding the initiator to uniformly mix.
It should be noted that, under the action of the ultrasonic dispersion machine, brownian motion of particles is greatly increased, so that diffusion particles are sufficiently dispersed in the glue, and further, agglomeration time of the diffusion particles is prolonged, a lamp shadow phenomenon occurs after the existing scheme paint is used for 1 hour, and a diffusion film prepared by the scheme of the embodiment of the invention still has no lamp shadow phenomenon after being used for 4 hours.
In some embodiments, the diffusion particles, the solvent and the dispersant are uniformly mixed by ultrasonic oscillation, wherein the frequency of the ultrasonic oscillation is 15-70kHZ, and the time of the ultrasonic oscillation is 5-30min, so that the uniformity of the mixing is further improved. The frequency of the ultrasonic oscillation may be 15kHZ, 20kHZ, 30kHZ, 40kHZ, 50kHZ, 60kHZ, 70kHZ, or the like.
In some embodiments, the diffusion particles are selected from at least one of PMMA microspheres and silica microspheres, the diffusion particles have a particle size of 3-15 μm, and the diffusion particles may be PMMA microspheres, silica microspheres, or a mixture of PMMA microspheres and silica microspheres.
In some embodiments, the diffusion particles may have particles having an average particle size of 3 to 5 μm in a range of 1 to 15% by weight of the total particles, particles having an average particle size of 6 to 9 μm in a range of 3 to 25% by weight of the total particles, and particles having an average particle size of 10 to 15 μm in a range of 60 to 96% by weight of the total particles.
In some embodiments, the UV-type coating is a multifunctional acrylic polymer, and the use of multifunctional acrylic polymers is suitable for the preparation process in the embodiments of the present invention. Preferably, the UV-based paint is at least one selected from the group consisting of aliphatic alcohol hexaacrylate, aliphatic urethane diacrylate, polyester acrylate, pentaerythritol hexaacrylate, pentaerythritol triacrylate, fatty acid-modified polyester hexaacrylate, and aliphatic urethane hexaacrylate, and may be one or a mixture of several.
In some embodiments, the solvent is selected from at least one of ethyl acetate, butyl acetate and butanone, and may be one or more of these solvents, which can dissolve the dispersed diffusion particles well.
In some embodiments, the type of initiator is selected from at least one of initiator 184 and initiator 1819, which may be one or more; the dispersant is selected from at least one of BYK3575, BYKAT203, BYK104S, BYK103, BYK110, BYK163, efka PX 4350, efka 4560, efka PX 4780, efka PX 4785, efka PX 4787, efka 4609, which may be one or more; the above initiators and dispersants are suitable for the coating formulation system provided in the embodiments of the present invention.
The inventor optimizes the dosage of each component: the mass ratio of the diffusion particles to the UV-type coating is 1; the concentration of the diffusion particles in the UV type diffusion layer glue coating is 8% -16%, the dosage of the initiator is 2% -6%, and the dosage of the dispersant is 0.3% -2% by controlling the dosages of other raw materials such as a solvent and the like. The uniformity of the coating and the homogeneity and brightness of the product are improved by optimizing the use amount of each raw material.
S2, forming a diffusion coating on the surface of the release film
Referring to fig. 1, a UV type diffusion layer glue coating is coated on the surface of a release film having a concave-convex structure on the surface under the action of a micro-concave roller to form a diffusion coating on the surface of the release film. By adopting the mode of coating the diffusion coating on the release film with the spherical convex structure, the excellent smoothness and stripping property of the release film are utilized to ensure that the coating is well leveled on the surface of the release film so as to improve the coating uniformity, and simultaneously, the effect of the concave-convex structure on the release film is utilized to ensure that particles in the coating obtain better wet coating transfer rate and good distribution and improve the roughness of the surface of the coating.
In the actual operation process, the slightly concave coating head comprises a bottom concave trough, a slightly concave coating roller and a scraper, the release film is contacted with the slightly concave roller at a certain wrap angle, and the UV coating is quantitatively transferred onto the release film under the action of the slightly concave roller and the scraper, so that the UV diffusion layer glue coating is uniformly loaded on the surface of the release film to form a diffusion coating; in the process of diffusion coating, the linear speed of coating is controlled to be 10-25m/min. Compared with the existing mode of directly coating on the diffusion base film, the transfer coating mode and the improvement of the coating mode in the embodiment of the invention can obviously improve the performance of the prepared diffusion film, and particularly can continuously keep the uniform distribution of diffusion particles in the using process and prevent the occurrence of a lamp shadow phenomenon.
In some embodiments, the surface roughness Ra of the release film is 100 to 1000nm, preferably 500 to 800nm, and the uniformity and brightness of the diffusion film product can be further improved by optimizing the roughness of the release film surface. The release film has a peeling force of 20 to 50gf/25mm, and typically 20gf/25mm, 25gf/25mm, 30gf/25mm, 35gf/25mm, 40gf/25mm, 45gf/25mm, 50gf/25mm, etc. The thickness of the release film is 25-250 mu m, the release film is made of pet material, and the light transmittance is more than or equal to 85%.
S3, transfer coating
And (3) pre-curing the diffusion coating, compounding the diffusion base film with the release film loaded with the diffusion coating, completely curing by UV irradiation, and peeling the release film after complete curing to obtain the diffusion film product.
It should be noted that, under the effect of the UV lamp, the coating is cured rapidly and anchored on the diffusion base film to form a stable diffusion coating, and the surface is transferred with a structure projection on the release film, so as to solve the problem of uneven surface particle distribution caused by glue viscosity, liquid flow fluctuation and particle agglomeration when the diffusion particles are distributed on the film surface during direct coating, and prevent the occurrence of lamp shadow phenomenon.
In the actual operation process, the diffusion coating is pre-cured through a drying tunnel, then the diffusion base film and the release film loaded with the diffusion coating are compounded under the action of a compression roller, and the diffusion base film and the release film are completely cured after being irradiated by a UV lamp; and after complete curing, peeling off the release film at the winding end to obtain the optical diffusion film product. The integrity and uniformity of the coating on the diffusion base film are ensured by performing transfer coating after the diffusion coating is primarily cured on the release film during precuring. The term "precuring" refers to the complete drying of the solvent in the glue, so that the glue molecules are in a high temperature active state.
In some embodiments, the pre-curing is carried out while controlling the temperature of the drying tunnel to be 70-110 ℃ and the treatment time to be 30-80 s. The temperature of the drying tunnel can be 70 ℃, 80 ℃, 90 ℃, 100 ℃, 110 ℃ and the like, and can also be any value between the above adjacent temperature values.
In some embodiments, the nip roll pressure for transfer coating is 50 ± 25N to better combine with the diffusion-based film.
In some embodiments, the intensity of the UV radiation is controlled to be 200mj/cm during the full cure process 2 - 1000mj/cm 2 The irradiation time is 10s-40s. In the actual operation process, the operation parameters of the complete curing are not limited to the above limitations, so as to ensure that the film layer is completely cured.
In some embodiments, the diffusion-based film is selected from at least one of pet film, PBT; preferably pet film, and the diffusion basement membranes are all suitable for the process of the embodiment of the invention to form a diffusion basement membrane product with excellent comprehensive performance. The pet film has a thickness of 75 μm to 200 μm, such as 75 μm, 100 μm, 125 μm, 150 μm, 188 μm, 200 μm, and the like.
In addition, the conventional direct coating method has a problem that the leveling property of the particles on the surface of the coating substrate is deteriorated as the liquid application time is prolonged, and the local particle distribution is not uniform. According to the coating transfer type method adopted by the embodiment of the invention, the high smoothness of the release film can be utilized to promote the flow of the feed liquid and the particles on the surface, the particles are prevented from being unevenly distributed, meanwhile, the protrusions of the micro-nano structure can form an adsorption and diffusion preventing surface functional layer on the surface of the diffusion film, the use amount of the particles is reduced, and the risk of agglomeration is further reduced.
The embodiment of the invention also provides a diffusion film, which is prepared by the preparation method, the specific structure is shown in fig. 2, the diffusion particles are uniformly distributed on both sides of the diffusion base film, and the diffusion film can be further prepared to obtain an LCD screen.
The features and properties of the present invention are described in further detail below with reference to examples.
Example 1
The present embodiment provides a method for manufacturing a diffusion film, including:
(1) Preparation of UV type diffusion layer glue coating
10g of PMMA microspheres and 0.066g of dispersant (BYK 103) are added into 88mL of solvent (ethyl acetate) and then uniformly mixed by ultrasonic oscillation (the frequency is 20 kHz) to obtain microsphere dispersion liquid, and then 12g of UV type coating (8 g of pentaerythritol hexaacrylate and 4g of fatty alcohol hexaacrylate) is slowly added into the microsphere dispersion liquid to enable the microspheres to form a stable dispersion state in glue solution. And (3) slowly adding 0.44g of initiator (initiator 184) into the glue solution, and uniformly mixing to obtain the UV type diffusion layer glue coating.
The PMMA microspheres are a multi-particle-size particle combination, wherein the proportion of particles with the average particle size of 3 mu m is 2%, the proportion of particles with the average particle size of 7 mu m is 3%, and the proportion of particles with the average particle size of 10 mu m is 95%.
Note: the addition ratio of the diffusion particles to the coating in this example was 1.2.
(2) Forming a diffusion coating on the surface of the release film
An organic silicon type pet release film (self-made, refer to a patent: a thermal transfer mold release for digital printing and a preparation method thereof) having a surface roughness Ra of 100nm was prepared, and the thickness of the release film was 75 μm.
Placing the UV type diffusion layer glue coating in a concave trough at the bottom, contacting the release film with a micro-concave roller at a certain wrap angle, quantitatively transferring the UV coating to the release film under the action of the micro-concave roller and a scraper, and uniformly loading the UV type diffusion layer glue coating on the surface of the release film to form a diffusion coating; during the diffusion coating process, the linear speed of the coating is controlled to be 15m/min.
(3) Transfer coating
The method comprises the steps of firstly treating the pet base film for 60 seconds through a drying tunnel with the temperature of 100 ℃, and then compounding the pet base film with the thickness of 188 microns and a release film with a diffusion coating under the action of a press roller, wherein the pressure of the compounding roller is about 50N. After compounding, complete curing was carried out by irradiation with a UV lamp at an intensity of 260mj/cm 2 The irradiation time was 16s. And peeling the release film at the winding end, and cooling to room temperature to obtain the optical diffusion film.
Example 2
This example provides a method for producing a diffusion film, which differs from example 1 only in that: the combination proportion of the diffusion particles (a plurality of PMMA microspheres) is adjusted, the total dosage is unchanged, and the method specifically comprises the following steps: the proportion of microspheres with the average grain diameter of 3 mu m is 5 percent, the proportion of microspheres with the average grain diameter of 5 mu m is 15 percent, and the proportion of microspheres with the average grain diameter of 12 mu m is 80 percent.
Example 3
This example provides a method for producing a diffusion barrier, which differs from example 1 only in that: the diffusion particles adopt the combination of PMMA microspheres and silicon dioxide microspheres, the total dosage of the PMMA microspheres and the silicon dioxide microspheres is unchanged, and the total dosage is as follows: the proportion of PMMA microspheres with the average particle size of 5 mu m is 7 percent, the proportion of silicon dioxide microspheres with the average particle size of 9 mu m is 5 percent, and the proportion of PMMA microspheres with the average particle size of 12 mu m is 88 percent.
Example 4
This example provides a method for producing a diffusion film, which differs from example 1 only in that: the addition ratio of the diffusion particles to the coating was 1.0.
Example 5
This example provides a method for producing a diffusion film, which differs from example 2 only in that: the addition ratio of the diffusion particles to the coating was 1.0.
Example 6
This example provides a method for producing a diffusion membrane, which differs from example 3 only in that: the addition ratio of the diffusion particles to the coating was 1.0.
Example 7
This example provides a method for producing a diffusion film, which differs from example 1 only in that: the surface roughness Ra of the release film is 500nm.
Example 8
This example provides a method for producing a diffusion film, which differs from example 2 only in that: the surface roughness Ra of the release film is 500nm.
Example 9
This example provides a method for producing a diffusion membrane, which differs from example 3 only in that: the surface roughness Ra of the release film is 500nm.
Example 10
This example provides a method for producing a diffusion film, which differs from example 1 only in that: the surface roughness Ra of the release film is 800nm.
Example 11
This example provides a method for producing a diffusion barrier, which differs from example 2 only in that: the surface roughness Ra of the release film is 800nm.
Example 12
This example provides a method for producing a diffusion film, which is different from example 3 only in that: the surface roughness Ra of the release film is 800nm.
Comparative example 1
The present comparative example provides a method for preparing a diffusion membrane, which employs the existing direct coating method to prepare a diffusion membrane, specifically as follows:
(1) UV type diffusion layer glue coating configuration reference is made to example 1.
(2) And (3) mixing the UV type diffusion layer glue coating by using a mechanical stirrer, directly coating the UV type diffusion layer glue coating on the pet diffusion base film in the embodiment 1, and pre-drying and UV curing to obtain a finished diffusion film.
Comparative example 2
The only difference from example 1 is: no ultrasonic vibration is generated in the batching process.
Comparative example 3
The only difference from example 1 is: the surface roughness of the release film was adjusted to 50nm.
Test example 1
The diffusion films obtained in the examples and comparative examples were tested for their properties, and the results are shown in table 1.
Transmittance and haze test of diffuser films: the test was performed using a HunterLab UltraScan PRO ultra-high precision spectrocolorimeter under test conditions performed according to the national standard GB 24101980.
Luminance and uniformity test of the diffusion film: a10.1 inch diffusion film was placed in a 6.5 inch backlight module and its brightness and uniformity were measured using a brightness meter (Germany, model BM 7).
Testing lamp shadow: 500ml of the prepared diffusion liquid is taken in a beaker, and samples are taken for 2 hours and 4 hours respectively to be coated and prepared under the stirring of a magnetic stirrer, and the appearance condition of the lamp shadow is tested.
TABLE 1 diffusion Membrane Performance test results
| Serial number | Transmittance/% | Haze/% | Homozygosity/%) | Luminance/lum (cd/m) 2 ) | Lamp shadow phenomenon (2 h) | Lamp shadow phenomenon (4 h) |
| Example 1 | 70.06 | 96.3 | 66.3 | 3000 | Is free of | Is free of |
| Example 2 | 70.23 | 96.06 | 66.1 | 2826.2593 | Is free of | Is free of |
| Example 3 | 68.18 | 96.59 | 66.8 | 2766.9259 | Is composed of | Is free of |
| Example 4 | 71.82 | 95.96 | 66.3 | 3195.1111 | Is free of | Is free of |
| Example 5 | 71.81 | 95.54 | 65.6 | 3053.8519 | Is free of | Is composed of |
| Example 6 | 69.75 | 96.15 | 65 | 2893.6296 | Is free of | Is free of |
| Example 7 | 71.2 | 96.30 | 66.3 | 3014.8889 | Is composed of | Is free of |
| Example 8 | 73.92 | 94.66 | 65.2 | 3206.963 | Is free of | Is free of |
| Example 9 | 73.94 | 94.67 | 65.3 | 3256.8889 | Is free of | Is composed of |
| Example 10 | 73.98 | 94.71 | 64.9 | 3282.7407 | Is free of | Is free of |
| Example 11 | 71.55 | 95.01 | 64.9 | 3115.265 | Is free of | Is free of |
| Example 12 | 71.54 | 95.60 | 65.3 | 3065.425 | Is free of | Is free of |
| Comparative example 1 | 68.6 | 95.2 | 6 3 .2 | 2867.265 | Is provided with | Is provided with |
| Comparative example 2 | 69.06 | 96.6 | 6 3 .8 | 2934.612 | Is free of | Is provided with |
| Comparative example 3 | 70.54 | 94.60 | 6 3 . 9 | 3065.425 | Is free of | Is provided with |
As can be seen from Table 1, the diffusion film prepared by the method has the advantages of light uniformity and light shadow prevention of the prepared product and can ensure good brightness at the same time due to the fact that the activity of diffusion particles is increased and the good leveling property of the release film is utilized.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A method of making a diffusion membrane, comprising:
coating the UV type diffusion layer glue coating on the surface of a release film with a concave-convex structure on the surface under the action of a micro-concave roller so as to form a diffusion coating on the surface of the release film;
firstly, pre-curing the diffusion coating, then compounding the diffusion base film with the release film loaded with the diffusion coating, and completely curing by UV irradiation;
the UV type diffusion layer glue coating is prepared by uniformly mixing diffusion particles, a solvent, a dispersing agent, a UV type coating and an initiator.
2. The preparation method of claim 1, wherein the micro-concave roller comprises a bottom concave trough, the release film is attached to the micro-concave roller, and the UV type diffusion layer glue paint adsorbed on the micro-concave roller is uniformly loaded on the surface of the release film in the running process to form the diffusion coating;
preferably, during the diffusion coating application process, the linear speed of the coating is controlled to be 10-25m/min;
preferably, the thickness of the release film is 25-250 μm, the release film is made of pet material, and the light transmittance is more than or equal to 85%;
preferably, the surface roughness Ra of the release film is 100-1000nm, more preferably 500-800nm;
preferably, the release film has a peel force of 20 to 50gf/25mm.
3. The method for preparing the UV type diffusion layer glue coating according to the claim 1, wherein the preparation process of the UV type diffusion layer glue coating comprises the following steps: uniformly mixing the diffusion particles, the solvent and the dispersing agent in an ultrasonic oscillation mode to obtain microsphere dispersion liquid, uniformly mixing the UV type coating and the microsphere dispersion liquid, and then adding the initiator to uniformly mix;
preferably, the frequency of the ultrasonic oscillation is 15-70kHZ, and the ultrasonic oscillation time is 5-30min.
4. The production method according to claim 3, wherein the diffusion particles are selected from at least one of PMMA microspheres and silica microspheres;
preferably, the average particle diameter of PMMA and the average particle diameter of silica diffusion particles are both 3-15 μm;
preferably, the diffusion particles may have particles having an average particle diameter of 3 to 5 μm in a proportion of 1 to 15% by weight, particles having an average particle diameter of 6 to 9 μm in a proportion of 3 to 25% by weight, and particles having an average particle diameter of 10 to 15 μm in a proportion of 60 to 96% by weight.
5. The production method according to claim 4, wherein the UV type paint is a multifunctional acrylic polymer, and the mass ratio of the diffusing particles to the UV type paint is 1; the concentration of the diffusion particles in the UV type diffusion layer glue coating is 8% -16%;
preferably, the UV type coating is at least one selected from the group consisting of aliphatic alcohol hexaacrylate, aliphatic urethane diacrylate, polyester acrylate, pentaerythritol hexaacrylate, pentaerythritol triacrylate, fatty acid modified polyester hexaacrylate, and aliphatic urethane hexaacrylate.
6. The production method according to claim 5, characterized in that the solvent is at least one selected from the group consisting of ethyl acetate, butyl acetate and methyl ethyl ketone;
preferably, the type of the initiator is selected from at least one of the initiator 184 and the initiator 1819, and the amount of the initiator is 2% -6%;
preferably, the dispersant is selected from at least one of BYK3575, BYKAT203, BYK104S, BYK103, BYK110, BYK163, efka PX 4350, efka 4560, efka PX 4780, efka PX 4785, efka PX 4787, efka 4609; the dosage of the dispersant is 0.3 to 2 percent.
7. The preparation method according to claim 1, characterized in that the diffusion coating is pre-cured through a drying tunnel, then the diffusion base film and the release film carrying the diffusion coating are compounded under the action of a press roller, and are cured after being irradiated by a UV lamp; after curing, peeling off the release film at the winding end to obtain an optical diffusion film product;
preferably, the temperature of the drying tunnel is 70-110 ℃;
preferably, the intensity of UV irradiation is controlled to 200mj/cm during the complete curing process 2 -1000 mj/cm 2 The irradiation time is 10s-40s;
preferably, the pressure of the press roll for transfer coating is 50 ± 25N.
8. The method of claim 7, wherein the diffusion-based film is selected from pet films;
preferably, the pet film has a thickness of 75 μm to 200 μm.
9. A diffusion membrane produced by the production method according to any one of claims 1 to 8.
10. Use of a diffuser film as claimed in claim 9 for the production of LCD screens.
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