CN108680980B - Blue light prevention optical film and preparation method thereof - Google Patents
Blue light prevention optical film and preparation method thereof Download PDFInfo
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- CN108680980B CN108680980B CN201810753030.8A CN201810753030A CN108680980B CN 108680980 B CN108680980 B CN 108680980B CN 201810753030 A CN201810753030 A CN 201810753030A CN 108680980 B CN108680980 B CN 108680980B
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Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/20—Filters
- G02B5/26—Reflecting filters
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Polarising Elements (AREA)
- Liquid Crystal (AREA)
Abstract
The invention relates to an optical film, in particular to a blue light prevention optical film applied to the fields of displays, LED screens or illumination and a preparation method thereof. The invention provides a blue light prevention optical film and a preparation method thereof, which are used for filtering out high-energy short-wave blue light which is harmful to eyes and comes from a display and illumination equipment. The blue light prevention optical film sequentially comprises a functional layer, a base material, an undercoat layer and a blue light prevention layer. The blue light preventing layer consists of cholesteric liquid crystal molecules, chiral agent, photoinitiator and polymerization inhibitor. Blue light in the wave band of 420-460nm can be selectively reflected by controlling the pitch of cholesteric liquid crystal formed in the blue light prevention layer, so that a good blue light prevention effect is achieved. The blue light prevention optical film provided by the invention not only has a good blue light prevention effect, but also has excellent optical properties such as high brightness, low color cast and the like.
Description
Technical Field
The invention relates to an optical film, in particular to a blue light prevention optical film applied to the fields of displays, LED screens or illumination and a preparation method thereof.
Background
Research shows that blue light (short wave light with the wavelength of 380-500 nm) in visible light can penetrate through the crystalline lens to reach the retina, free radicals can be generated by long-term irradiation of the retina, and the free radicals can lead to the attenuation of retinal pigment epithelial cells, further lead to the lack of nutrients of photosensitive cells, and finally lead to vision injury. And the degree of damage increases rapidly with decreasing wavelength of the light wave. Blue light has been investigated to prove to be the most damaging visible light. Medical research also shows that the human eyes are insensitive to vision and color discrimination of purple light and partial blue light in the wave band of 380-480nm, namely, the eyes have limited color resolution capability to the chromatic light in the wave band, but the wave band has short wave length and high energy, and the eyes are greatly damaged. Therefore, effective prevention of blue light below 480nm is critical to eye protection.
At present, the LED display adopts red, green and blue primary excitation as a backlight light source, and the wavelength range of blue light is 420-460nm, so that the development of the blue light prevention protective film needs to selectively protect against the wave band.
At present, a lot of reports about blue light prevention protective films are about, and the preparation method is mainly to add a blue light absorber in an organic dye into a coating to achieve the purpose of blue light prevention. For example, patent CN103991255a (publication date is 2014, 08 and 20) discloses a blue light preventing screen protective film and a preparation method thereof, and the patent prepares the blue light preventing screen protective film by adding azo permanent yellow organic dye into the blue light preventing layer; CN103935097a (publication date is 2017, 07, 23) discloses a blue light preventing hardening film, and the method adopted by the patent is to add 0.5% -10% of metal complex dye blue light absorbent into the blue light preventing layer to achieve the purpose of blue light prevention. However, the preparation of the blue light prevention protective film by adopting the organic dye has great defects that firstly, the heavy metal in the blue light absorbent in the organic dye has potential safety hazard and can cause environmental pollution, and the blue light prevention protective film is externally attached to the outside of the display screen for use and human body contact are easy to generate life harm; secondly, after the blue light is absorbed by the blue light absorbent in the organic dye, the appearance of the blue light prevention film is seriously color cast, and normal use is influenced. Most importantly, the blue light absorber in the organic dye is fixed due to the molecular structure, and the absorbed blue light wave band is fixed, so that the blue light of a specific wave band can not be selectively protected.
Therefore, the development of an environment-friendly low-color-cast blue-light-preventing optical film capable of selectively protecting blue light in a specific wave band is an urgent problem to be solved in the field of optical films, and has important significance for protecting eyes when people use electronic products.
Disclosure of Invention
The invention provides a blue light prevention optical film and a preparation method thereof, which are used for filtering out high-energy short-wave blue light which is harmful to eyes and comes from a display and illumination equipment. The blue light prevention optical film provided by the invention not only can selectively play a role in protecting a specific blue light wave band, but also has the excellent optical properties of low color, long service life, high brightness and the like. The preparation method of the blue light prevention optical film provided by the invention is environment-friendly, pollution-free, simple and feasible, and has the value of industrial production.
In order to solve the technical problems, the invention adopts the following technical scheme:
the invention provides a blue light prevention optical film which sequentially comprises a functional layer, a substrate layer, an undercoat layer and a blue light prevention layer.
Further, the blue light prevention optical film is composed of a base layer material, a functional layer, an undercoat layer and a blue light prevention layer; one side of the base material layer is provided with a functional layer, and the other side of the base material layer is provided with an undercoat layer; and the other side of the bottom coating is provided with a blue light prevention layer.
Further, the blue light prevention layer is a cholesteric liquid crystal coating.
Further, the blue light preventing layer includes cholesteric liquid crystal molecules.
Further, the raw materials of the blue light prevention layer comprise cholesteric liquid crystal molecules, chiral agents, photoinitiators and polymerization inhibitors.
Further, the blue light prevention layer is composed of cholesteric liquid crystal molecules, chiral agents, photoinitiators and polymerization inhibitors.
Further, the blue light prevention layer comprises the following components: 75-90 parts by weight of cholesteric liquid crystal molecules; 1-20 parts of chiral agent, 1-10 parts of photoinitiator and 0.1-0.5 part of polymerization inhibitor.
Further, the blue light prevention layer is composed of the following components: 75-90 parts by weight of cholesteric liquid crystal molecules; 1-20 parts of chiral agent, 1-10 parts of photoinitiator and 0.1-0.5 part of polymerization inhibitor.
Further, in the blue light prevention layer, the total weight part of the cholesteric liquid crystal molecules, the chiral agent and the photoinitiator is 100 parts.
Further, in the preparation process of the protective film, the material of the blue light prevention layer is firstly prepared into blue light prevention coating liquid, and the blue light prevention coating liquid comprises 75-90 parts by weight of cholesteric liquid crystal molecules; 1-20 parts of chiral agent, 1-10 parts of photoinitiator and 0.1-0.5 part of polymerization inhibitor, and a plurality of organic solvents; wherein, the total weight part of the cholesteric liquid crystal molecules, the chiral agent and the photoinitiator is 100 parts.
Further, the solid content of the blue light prevention coating liquid is 30% -40%.
Further, the blue light preventing coating liquid comprises 150-300 parts by weight of an organic solvent.
Further, the blue light preventing coating liquid comprises 150-233 parts by weight of an organic solvent.
Further, the blue light prevention coating liquid comprises 180-210 parts by weight of an organic solvent.
Further, the blue light prevention coating liquid comprises 180-200 parts by weight of an organic solvent.
The blue light prevention layer is a cholesteric liquid crystal coating; the cholesteric liquid crystal coating can obtain a specific screw pitch through formula adjustment, and can selectively reflect blue light with a specific wave band of 420-460 nm.
Further, the substrate layer material is selected from one of Polycarbonate (PC), polyethylene terephthalate (PET), polyamide resin (PA), polystyrene (PS), polyethylene (PE), polypropylene (PP) and polymethyl methacrylate (PMMA); preferably, the substrate layer material is selected from one or a combination of at least two of polyethylene terephthalate (PET), polystyrene (PS) and Polyethylene (PE).
Further, the thickness of the substrate layer is 1-300 μm; preferably, the thickness of the substrate is 25-200 μm.
Further, the functional layer is a diffusion functional layer or a brightening functional layer.
Further, the diffusion functional layer comprises 100 parts by weight of adhesive resin and 60-150 parts by weight of diffusion particles.
Further, the diffusion functional layer comprises 100 parts by weight of adhesive resin and 80-100 parts by weight of diffusion particles.
Further, the diffusion functional layer comprises 100 parts by weight of adhesive resin and 90 parts by weight of diffusion particles.
Further, the thickness of the diffusion functional layer is 0.5-40 μm.
Further, the thickness of the diffusion functional layer is 3-20 μm.
Further, the thickness of the diffusion functional layer is 12-20 mu m.
The functional layer is coated on one side of the substrate layer, and the function of the functional layer is to provide the effect of preventing the blue light optical film from diffusing and homogenizing light or brightening light in the use process.
Further, the adhesive in the diffusion functional layer is selected from one or a mixture of at least two of acrylic resin, polyurethane resin and epoxy resin. The diffusion particles are spherical or ellipsoidal. The diffusion particles are selected from polymethyl methacrylate Particles (PMMA), polybutyl methacrylate Particles (PBMA), polystyrene Particles (PS), silica particles (SiO) 2 ) Titanium dioxide particles (TiO) 2 ) Barium sulfate particles (BaSO) 4 ) One or a combination of at least two of the foregoing. The particle size of the diffusion particles is in the range of 0.1-35 mu m. Further, the diffusion particles have a particle size in the range of 5 to 15 μm.
Further, in the blue light preventing optical film, the functional layer is a UV curable coating (ultraviolet curable coating) engraved with a microstructure.
Further, the coating material in the UV curing coating carved with the microstructure is one or a mixture of at least two of acrylic resin, polyurethane resin and epoxy resin. The microstructure can be a micro-prism structure or a micro-lens structure, the height of prism strips of the micro-prism structure is 5-60 mu m, the edge angle is 70-120 degrees, and the prism strips can be a dithering structure or a regular linear type; the micro lens structure is a hemispherical or semi-like structure, the diameter of the hemispherical or semi-like structure is 5-200 mu m, and the height is 1/5-2/3 of the diameter.
The height of the prism strips of the micro-prism structure is 55 mu m, and the edge angle is 90 degrees.
The hemispherical or semi-hemispherical structure has a diameter of 30 μm and a height of 1/2 of the diameter.
The bottom coating is coated on the other surface of the substrate layer, and the bottom coating is used for friction orientation, so that ordered orientation arrangement of cholesteric liquid crystal molecules is facilitated, light penetrability is improved, and brightness of the blue light preventing optical film is improved.
Further, the thickness of the primer layer is 1-5 μm.
Further, the thickness of the bottom coating is 2-3 μm.
Further, the material of the bottom coating is one or a combination of at least two of polyimide, polyamide, polysiloxane, polyurethane, polyacrylate and epoxy resin. Preferably, the material of the bottom coating is one or a combination of at least two of polyimide, polyurethane and polyacrylate.
The blue light prevention layer is arranged on the other side of the bottom coating, and the blue light prevention layer selectively reflects blue light of a specific wave band.
Further, the cholesteric liquid crystal molecules are selected from cholesteric liquid crystal molecules with acrylic double bonds.
The cholesteric liquid crystal molecules preferably have one acrylic double bond or two acrylic double bonds.
Further, the cholesteric liquid crystal molecules are selected from one or a combination of at least two of cholesteric liquid crystal molecules with a structural formula a, a structural formula b or a structural formula c. Wherein m in the structural formula a is an integer of 0 to 8; wherein n in structural formula b is an integer of 0 to 7; wherein x and y in the structural formula c are integers of 0 to 7, respectively.
Structural formula a
Structural formula b
Structural formula c
Further, the chiral agent is selected from chiral compounds with acrylic double bonds. Further, the chiral agent is selected from one or a combination of at least two chiral agents with a structural formula e or a structural formula f. Wherein, p in the structural formula e is an integer of 0-7; wherein n in the structural formula f is an integer of 0 to 8.
Structural formula e
Structural formula f
Further, the photoinitiator is selected from one or a combination of two of 2-hydroxy-methyl phenyl propane-1-ketone (photoinitiator 1173), 1-hydroxy cyclohexyl phenyl ketone (photoinitiator 184), 2-methyl-1- (4-methylthiophenyl) -2-morpholino-1-acetone (photoinitiator 907), benzoin dimethyl ether (photoinitiator 651), 2,4, 6-trimethyl benzoyl diphenyl phosphine oxide diphenyl benzophenone (photoinitiator BP) and 2,4, 6-trimethyl benzoyl diphenyl phosphine oxide (photoinitiator TPO).
Further, the polymerization inhibitor is selected from one or a mixture of at least two of hydroquinone, methyl hydroquinone, p-hydroxyanisole or 2-tertiary butyl hydroquinone.
Further, the thickness of the blue light preventing layer is 1-6 mu m.
Further, in the transparent blue light preventing protective film, the thickness of the base material layer is preferably 25 to 200 μm, the thickness of the undercoat layer is preferably 2 to 3 μm, and the thickness of the blue light preventing layer is preferably 2 to 4 μm.
Further, the blue light prevention layer comprises the following components: 80-88 parts by weight of cholesteric liquid crystal molecules; 6-14 parts of chiral agent, 4-7 parts of photoinitiator and 0.2-0.3 part of polymerization inhibitor.
Further, m=4-6 in structural formula a; n=4 in structural formula b; x=3-4 and y=2-3 in structural formula c; p=4-5 in structural formula e; q=6-8 in structural formula f. (the foregoing technical scheme includes examples 4 to 7 and example 9.)
Further, in the transparent blue light preventing protective film, the thickness of the base material layer is preferably 75 to 200 μm, the thickness of the undercoat layer is preferably 2 to 3 μm, and the thickness of the blue light preventing layer is preferably 3 to 4 μm.
Further, the blue light prevention layer comprises the following components: 85-88 parts by weight of cholesteric liquid crystal molecules; 8-10 parts of chiral agent, 4-5 parts of photoinitiator and 0.2-0.3 part of polymerization inhibitor.
Further, n=4 in structural formula b; x=3, y=3 in structural formula c; p=4 in structural formula e; q=6 in structural formula f. (the foregoing technical scheme includes example 5 and example 6.)
The blue light prevention principle of the blue light prevention layer of the invention is to use the principle of selective reflection of cholesteric liquid crystal. Cholesteric liquid crystal molecules are structurally characterized by a layered arrangement with the long axis of the molecules parallel to the plane of the layer and the molecules within the layer aligned generally along the director direction, as well as nematic liquid crystals, with long-range alignment without positional order. The director direction between adjacent layers is sequentially rotated regularly by a certain angle under the influence of the asymmetric chiral structure, continuously and uniformly twisted along the normal direction, and the layers are rotated into a spiral structure. The director direction of the liquid crystal molecules in the layer returns to the initial alignment state after 360 deg. rotation, and this periodic interlayer spacing is called pitch (P). The periodic helical structure of cholesteric liquid crystals produces bragg reflection for incident light. When light is perpendicularly incident to the plane textured cholesteric liquid crystal, the relationship between the wavelength lambda of the central wave band of the reflected light and the pitch is as follows: λ= n P; reflected wave width range Δλ=Δ n P; wherein n and Δn are the average refractive index and the birefringence of the liquid crystal material, respectively, and are the basic physical properties of the liquid crystal material, and are substantially unchanged. The invention designs that chiral compounds (i.e. chiral agents) are doped into cholesteric liquid crystal molecules to adjust the size of the pitch, thereby realizing the effect of selectively reflecting blue light in a specific wave band.
The invention also provides application of the blue light prevention optical film, and the blue light prevention optical film is applied to the fields of displays, LED screens or illumination and has the function of preventing blue light and protecting eyes. The blue light preventing optical film can be used as a diffusion film or a brightness enhancement film in a backlight module of a display device.
The invention also provides a method for preparing the blue light prevention optical film, which comprises the following steps:
(1) Coating a functional layer coating liquid on one surface of the substrate layer, and curing to obtain a functional layer;
(2) Coating an undercoat coating liquid on the other surface of the substrate layer, and heating and curing to obtain an undercoat;
(3) Directional friction is carried out on the surface of the bottom coating by using a flannelette rod, so that grooves (directors) with consistent directions are generated on the surface of the bottom coating after friction;
(4) Coating blue light prevention coating liquid on the surface of the rubbed base coat, heating the base coat by an oven to dry the surface of the coating, and performing ultraviolet light curing to obtain a blue light prevention layer; thus, the blue light preventing optical film is prepared.
Further, the blue light prevention coating liquid consists of the following components:
cholesteric liquid crystal molecules: 75-90 parts by weight;
chiral agent: 1 to 20 parts by weight of a resin,
and (3) a photoinitiator: 1 to 10 parts by weight of a resin,
polymerization inhibitor: 0.1 to 0.5 part by weight,
organic solvent: a plurality of parts of the components are arranged in a certain proportion,
the components are weighed according to weight and added into an organic solvent to be uniformly stirred to prepare the blue light prevention coating liquid with the mass solid content of 30-40 percent.
Further, the organic solvent in the step (4) may be a common organic solvent, and butanone, cyclohexanone, ethyl acetate, butyl acetate, n-butanol and the like are exemplified.
In the step (4), the components in the blue light preventing coating liquid are weighed and added, and then stirred for half an hour to prepare the uniformly dispersed blue light preventing coating liquid. The temperature of the oven is 60-100 ℃, and the baking time is 30-100 seconds.
Blue light in the wave band of 420-460nm can be selectively reflected by controlling the pitch of cholesteric liquid crystal formed in the blue light prevention layer (blue light prevention layer), so that a good blue light prevention effect is achieved. The blue light prevention optical film provided by the invention not only has a good blue light prevention effect, but also has excellent optical properties such as high brightness, low color cast and the like.
The blue light prevention optical film provided by the invention comprises a protective film, a protective film and a protective film, wherein the protective film consists of a base material, a functional layer, an undercoat layer and a blue light prevention layer; the functional layer can play a role in homogenizing or brightening the light in the use process; the bottom coating is mainly in friction orientation, which is beneficial to orderly arrangement of liquid crystal orientation, increases light penetrability and improves brightness of the blue light preventing optical film; the blue light prevention layer is provided with a pitch of the prepared cholesteric liquid crystal by adjusting the proportion of chiral agent and cholesteric liquid crystal molecules in the formula, so that blue light with specific wavelength can be selectively reflected, and the blue light prevention effect is achieved. Therefore, the blue light prevention optical film provided by the invention has better excellent effects of high brightness, low color cast and blue light prevention wave band regulation and control, and can meet different requirements on blue light prevention. The blue light-proof optical film method provided by the invention is prepared by adopting the current mature optical film coating process, has a simple and mature process, and meets the condition of industrial mass production. Meanwhile, the blue light prevention optical film provided by the invention is placed in a backlight module of a display for use, so that the blue light prevention optical film is prevented from being in direct contact with a human body, the possible harm of chemical substances to the human body is effectively avoided, and meanwhile, the defect that the external blue light prevention protective film is easy to scratch and short in service life is avoided.
Compared with the prior art, the blue light prevention optical film provided by the invention has obvious advantages compared with the traditional blue light prevention optical film, and the defects of serious color cast and low brightness of the existing blue light prevention film are well overcome; and the problem that the traditional blue light prevention protective film has no selective controllable operation on the prevented blue light wave band is solved. Meanwhile, the preparation method of the blue light prevention optical film provided by the invention has the advantages of simple process, easiness in operation and environmental protection without heavy metal pollution.
The blue light prevention optical film provided by the invention is a blue light prevention protective film with high brightness and low color cast and can selectively reflect blue light, is particularly suitable for the field of optical display, and is particularly suitable for the fields of displays, LED screens or illumination, but is not limited to the above listed products.
Drawings
FIG. 1 is a schematic diagram of a blue light preventing optical film according to the present invention;
FIG. 2 is a schematic diagram of another blue light preventing optical film according to the present invention;
fig. 3 is a schematic structural diagram of another blue light preventing optical film according to the present invention.
The specific embodiment is as follows:
the present invention is further illustrated by the following examples and figures, which are only illustrative of the present invention and are not intended to limit the scope of the invention as claimed. The methods are conventional methods unless otherwise specified. The raw materials are all commercially available products unless otherwise specified.
As shown in fig. 1, the present invention provides a blue light preventing optical film including a functional layer 101, a base material layer 102, an undercoat layer 103, and a blue light preventing layer 104; the functional layer 103 is a diffusion functional layer. The diffusion functional layer comprises diffusion microbeads and an adhesive.
As shown in fig. 2, the present invention provides a blue light preventing optical film including a functional layer 201, a base material layer 202, an undercoat layer 203, and a blue light preventing layer 204; the functional layer 201 is a micro-prism structure, and the prism bars are linear.
As shown in fig. 3, the present invention provides a blue light preventing optical film including a functional layer 301, a base material layer 302, an undercoat layer 303, and a blue light preventing layer 304; the functional layer 301 is a hemispherical microlens structure.
The invention relates to evaluation of optical performance of a prepared blue light prevention optical film. The required materials and equipment are all existing materials and equipment.
The preparation method of the blue light prevention optical film provided by the invention comprises the following steps:
(1) Coating a functional layer coating liquid on one surface of the substrate layer, and curing to obtain a functional layer;
(2) Coating an undercoat coating liquid on the other surface of the substrate layer, and heating and curing to obtain an undercoat;
(3) Directional friction is carried out on the surface of the bottom coating by using a flannelette roller, so that the surface of the bottom coating generates groove orientation after friction;
(4) Coating blue light prevention coating liquid on the surface of the rubbed base coat, heating the base coat by an oven to dry the surface of the coating, and performing ultraviolet light curing to obtain a blue light prevention layer; thus, the blue light preventing optical film is prepared.
The blue light prevention coating liquid consists of the following components:
cholesteric liquid crystal molecules: 75-90 parts by weight;
chiral agent: 1 to 20 parts by weight of a resin,
and (3) a photoinitiator: 1 to 10 parts by weight of a resin,
polymerization inhibitor: 0.1 to 0.5 part by weight,
organic solvent: a plurality of parts of the components are arranged in a certain proportion,
the components are weighed according to weight and added into an organic solvent to be uniformly stirred to prepare the blue light prevention coating liquid with the mass solid content of 30-40 percent.
Further, the organic solvent in the step (4) may be a common organic solvent. The organic solvent in the step (4) may be one or a combination of at least two of butanone, cyclohexanone, ethyl acetate, butyl acetate and n-butanol.
In the step (4), the components in the blue light preventing coating liquid are weighed and added according to the weight ratio, and then stirred for half an hour to prepare the uniformly dispersed blue light preventing coating liquid, the blue light preventing coating liquid is coated on the surface of the bottom coating to form a blue light preventing coating, and then the blue light preventing coating is heated by an oven, wherein the temperature of the oven is 60-100 ℃, and the baking time is 30-100 seconds. And then, the blue light prevention coating is solidified by ultraviolet light, and the blue light prevention layer is obtained after solidification.
The main optical properties of the blue light preventing optical films provided in the examples and comparative examples of the present invention were tested in the following manner.
1. Light transmittance and haze test: a blue light preventing optical film to be detected of A4 is taken and put into a light transmittance haze tester (NDH 7000) to measure the light transmittance or haze value of the optical film.
2. Brightness test: a piece of A4-sized blue light preventing optical film to be tested is taken, placed into a 20-inch backlight module according to a test framework, lightened under the voltage of 24V, and the chromaticity of the optical film is tested by a luminance meter (BH-7).
3. Chromaticity test: a piece of A4-sized blue light preventing optical film to be tested is taken, placed into a 20-inch backlight module according to a test framework, lightened under the voltage of 24V, and the chromaticity of the optical film is tested by a luminance meter (BH-7).
4. Blue light isolation rate test: and (3) placing a 5-inch blue light prevention film to be tested into a spectrophotometer to test the blocking condition of blue light with the wavelength of 420-460 nm. The test result is the proportion of blue light reflection (proportion of the amount of reflected blue light to the total amount of blue light irradiated onto the optical film) at wavelengths of 420nm to 460nm, which is called blue light blocking rate. The higher the blue light isolation rate, the more blue light is reflected, and the better the blue light prevention effect is.
5. Blue light reflection peak test: and marking the wavelength corresponding to the highest point of the blue light blocking rate in the blue light blocking rate test spectrogram as a blue light reflection peak value. The closer the blue light reflection peak value is to the central value of the blue light wave band of the target prevention, the better the blue light prevention effect. I.e. the closer the blue reflection peak is to the central value 440nm of the target wave band 420-460nm, the better the blue light preventing effect.
Example 1
The invention provides a blue light prevention optical film, which sequentially comprises a functional layer, a base layer material, an undercoating layer and a blue light prevention layer.
The preparation method of the blue light prevention optical film comprises the following steps:
(1) Coating a functional layer coating liquid on one surface of the substrate layer, and curing to obtain a functional layer;
(2) Coating an undercoat coating liquid on the other surface of the substrate layer, and heating and curing to obtain an undercoat;
(3) Directional friction is carried out on the surface of the bottom coating by using a flannelette roller, so that the surface of the bottom coating generates groove orientation after friction;
(4) Coating blue light prevention coating liquid on the surface of the rubbed base coat, heating the base coat by an oven to dry the surface of the coating, and performing ultraviolet light curing to obtain a blue light prevention layer; thus, the blue light preventing optical film is prepared.
Wherein the substrate layer is made of PET material and has a thickness of 100 μm; the functional layer is a diffusion functional layer and comprises 100 weight parts of polyurethane adhesive and 60 weight parts of PS diffusion particles, wherein the particle size range of the diffusion particles is 0.1-0.5 mu m, the appearance is spherical, and the thickness of the diffusion functional layer is 0.5-2 mu m, as shown in figure 1; the material of the bottom coating is epoxy resin, and the thickness of the coating is 5 mu m; the thickness of the blue light preventing layer coating is 1 mu m.
The blue light prevention coating liquid consists of the following components:
the structural formula of the cholesteric liquid crystal molecules is a, wherein m=8 and the weight part is 90 weight parts; the chiral agent has a structural formula of e, wherein p=0 and 9 parts by weight; the photoinitiator was 2-hydroxy-methylphenyl propan-1-one (photoinitiator 1173), 1 part by weight; the polymerization inhibitor is hydroquinone, and the weight part is 0.5 part; the organic solvent is cyclohexanone, and the weight portion is 233 weight portions.
The components are weighed according to weight and added into an organic solvent to be uniformly stirred to prepare the blue light prevention coating liquid with the mass solid content of 30 percent, and the blue light prevention coating liquid is coated on the bottom coating layer to prepare the blue light prevention layer after ultraviolet curing.
Example 2
The blue light preventing optical film according to embodiment 1, wherein the substrate layer is made of PMMA and has a thickness of 1 μm; the functional layer is a UV functional layer of a micro-prism structure, the micro-prism structure is made of acrylic resin, the height of prism strips of the micro-prism structure is 5 mu m, the edge angle is 70 degrees, and the prism strips are of equal-height linear type, as shown in figure 2; the material of the bottom coating is polyurethane, and the thickness of the coating is 1 mu m; the thickness of the blue light preventing layer coating is 2 mu m.
The blue light prevention coating liquid consists of the following components:
the structural formula of the cholesteric liquid crystal molecules is b, wherein n=7, and the weight parts are 75 weight parts; the chiral agent has a structural formula f, wherein q=0 and the weight part is 20 weight parts; the photoinitiator is 2,4, 6-trimethylbenzoyl-diphenyl phosphine oxide (TPO), and the weight part is 5; the polymerization inhibitor is methyl hydroquinone, and the weight part is 0.1 part; the organic solvent is cyclohexanone, and the weight part is 200 weight parts.
Example 3
The blue light preventing optical film according to embodiment 1, wherein the substrate layer is made of PP material and has a thickness of 300 μm; the functional layer is a UV functional layer of a micro-lens structure, the micro-lens structure is made of polyurethane resin, the micro-lens structure is a hemispherical bulge with the diameter of 25 mu m, and the bulge height is 10 mu m, as shown in figure 3; the material of the bottom coating is epoxy resin, and the thickness of the coating is 5 mu m; the thickness of the blue light preventing layer coating is 6 mu m.
The blue light prevention coating liquid consists of the following components:
the structural formula of the cholesteric liquid crystal molecules is c, wherein x=7 and y=7, and the parts by weight is 77 parts by weight; the chiral agent is a combination of two chiral compounds, wherein one structural formula is e, wherein p=4 and the weight part is 5; the other formula is f, wherein q=8 and the parts by weight are 10 parts by weight; the photoinitiator is 2-methyl-1- (4-methylthiophenyl) -2-morpholinyl-1-propanone (907) with 8 parts by weight; the polymerization inhibitor is p-hydroxyanisole, and the weight part is 0.5 part; the organic solvent is butanone, and the weight portion is 150 weight portions.
Example 4
The blue light preventing optical film according to embodiment 1, wherein the substrate layer is made of PE and has a thickness of 75 μm; the functional layer is a diffusion functional layer and comprises 100 weight parts of polyurethane adhesive and 80 weight parts of PMMA diffusion particles, wherein the particle size of the diffusion particles is 10 mu m, the appearance is spherical, and the thickness of the diffusion functional layer is 8-15 mu m; the material of the bottom coating is polyurethane, and the thickness of the coating is 2 mu m; the thickness of the blue light preventing layer coating is 3 mu m.
The blue light prevention coating liquid consists of the following components:
the structural formula of the cholesteric liquid crystal molecules is a, wherein m=6 and the weight parts are 80 weight parts; the chiral agent has a structural formula f, wherein q=8 and 13 parts by weight; the photoinitiator was 2-hydroxy-methylphenyl propan-1-one (1173), 7 parts by weight; the polymerization inhibitor is hydroquinone, and the weight part is 0.3 part; the organic solvent is butyl acetate, and the weight part is 190 weight parts.
Example 5
The blue light preventing optical film according to embodiment 1, wherein the substrate layer is made of PET and has a thickness of 200 μm; the functional layer is a UV functional layer of a micro-prism structure, the micro-prism structure is made of acrylic resin, the height of prism strips of the micro-prism structure is 55 mu m, the edge angle is 90 degrees, and the prism strips are of equal-height linear type; the material of the bottom coating is polyimide, and the thickness of the coating is 3 mu m; the thickness of the blue light prevention layer coating is 4 mu m
The blue light prevention coating liquid consists of the following components:
the structural formula of the cholesteric liquid crystal molecules is b, wherein n=4 and the weight parts are 88 weight parts; the chiral agent has a structural formula f, wherein q=6 and the weight part is 8; the photoinitiator is 1-hydroxy cyclohexyl phenyl ketone (184), and the weight part is 4; the polymerization inhibitor is p-hydroxyanisole, and the weight part is 0.3 part; the organic solvent is butyl acetate, and the weight part is 180 weight parts.
Example 6
The blue light preventing optical film according to embodiment 1, wherein the substrate layer is made of PET and has a thickness of 75 μm; the functional layer is a diffusion functional layer and comprises 100 weight parts of polyurethane adhesive and 90 weight parts of PMMA diffusion particles, wherein the particle size of the diffusion particles is 15 mu m, the appearance is spherical, and the thickness of the diffusion functional layer is 12-20 mu m; the material of the bottom coating is polyimide, and the thickness of the coating is 2 mu m; the thickness of the blue light preventing layer coating is 3 mu m.
The blue light prevention coating liquid consists of the following components:
the structural formula of the cholesteric liquid crystal molecules is c, wherein x=3 and y=3, and the weight parts are 85 weight parts; the chiral agent has a structural formula of e, wherein p=4 and the weight part is 10; the photoinitiator is 1-hydroxy cyclohexyl phenyl ketone (184), and the weight part is 5; the polymerization inhibitor is hydroquinone, and the weight part is 0.2 part; the organic solvent is cyclohexanone, and the weight part is 200 weight parts.
Example 7
The blue light preventing optical film according to embodiment 1, wherein the substrate layer is made of PS material and has a thickness of 25 μm; the functional layer is a UV functional layer of a micro-lens structure, the micro-lens structure is made of acrylic resin, the micro-lens structure is a hemispherical bulge with the diameter of 30 mu m, and the height of the bulge is 15 mu m; the material of the bottom coating is polyurethane, and the thickness of the coating is 3 mu m; the thickness of the blue light preventing layer coating is 3 mu m.
The blue light prevention coating liquid consists of the following components:
the cholesteric liquid crystal molecules are a combination of two cholesteric liquid crystal molecules, wherein one of the cholesteric liquid crystal molecules has a structural formula of a, m=4, and 60 parts by weight; the other structural formula is a, wherein m=6 and the weight part is 28 weight parts; the chiral agent has a structural formula f, wherein q=6 and the weight part is 6; the photoinitiator is 2-methyl-1- (4-methylthiophenyl) -2-morpholinyl-1-propanone (907) with a weight fraction of 6 weight fractions; the polymerization inhibitor is methyl hydroquinone, and the weight part is 0.2 part; the organic solvent is cyclohexanone, and the weight part is 200 weight parts.
Example 8
The blue light preventing optical film according to embodiment 1, wherein the substrate layer is made of PA material and has a thickness of 250 μm; the functional layer is a UV functional layer of a micro-lens structure, the micro-lens structure is made of epoxy resin, the micro-lens structure is a hemispherical bulge with the diameter of 5-200 mu m, and the height of the bulge is 1/5-2/3 of the diameter; the material of the bottom coating is polyimide, and the thickness of the coating is 5 mu m; the thickness of the blue light preventing layer coating is 5 mu m.
The blue light prevention coating liquid consists of the following components:
the structural formula of the cholesteric liquid crystal molecules is b, wherein n=0 and the weight parts are 80 weight parts; the chiral agent has a structural formula of e, wherein p=7 and the weight part is 16 weight parts; the photoinitiator is 2-methyl-1- (4-methylthiophenyl) -2-morpholinyl-1-propanone (907) with the weight portion being 4; the polymerization inhibitor is p-hydroxyanisole, and the weight part is 0.4 part; the organic solvent is n-butanol, and the weight part is 160 weight parts.
Example 9
The blue light preventing optical film according to embodiment 1, wherein the substrate layer is made of PET and has a thickness of 75 μm; the functional layer is a diffusion functional layer and comprises 100 parts by weight of epoxy resin adhesive and 100 parts by weight of PMMA diffusion particles, wherein the particle size of the diffusion particles is 5 mu m, the appearance is ellipsoidal, and the thickness of the diffusion functional layer is 3-8 mu m; the material of the bottom coating is polyacrylate, and the thickness of the coating is 3 mu m; the thickness of the blue light preventing layer coating is 2 mu m.
The blue light prevention coating liquid consists of the following components:
the structural formula of the cholesteric liquid crystal molecules is c, wherein x=4 and y=2, and the weight parts are 82 weight parts; the chiral agent has a structural formula of e, wherein p=5 and the weight part is 14; the photoinitiator was 2-hydroxy-methylphenyl propan-1-one (1173), 4 parts by weight; the polymerization inhibitor is methyl hydroquinone, and the weight part is 0.3 weight part; the organic solvent is n-butanol, and the weight portion is 210 weight portions.
Example 10
The blue light preventing optical film according to embodiment 1, wherein the substrate layer is made of PC material and has a thickness of 150 μm; the functional layer is a UV functional layer of a micro-prism structure, the micro-prism structure is made of acrylic resin, the height of prism strips of the micro-prism structure is 60 mu m, the edge angle is 120 DEG, and the prism strips are of equal-height linear type; the material of the bottom coating is polyamide, and the thickness of the coating is 4 mu m; the thickness of the blue light preventing layer coating is 5 mu m.
The blue light prevention coating liquid consists of the following components:
the cholesteric liquid crystal molecules are a combination of two cholesteric liquid crystal molecules, wherein one of the cholesteric liquid crystal molecules has a structural formula of a, m=4, and 49 parts by weight; the other structural formula is b, wherein n=5, and the weight part is 40; the chiral agent has a structural formula of e, wherein p=5 and the weight part is 5; the photoinitiator is 1-hydroxy cyclohexyl phenyl ketone (184), and the weight part is 6; the polymerization inhibitor is methyl hydroquinone, and the weight part is 0.4 part; the organic solvent is cyclohexanone, and the weight part is 160 weight parts.
Example 11
The blue light preventing optical film according to embodiment 1, wherein the substrate layer is made of PET and has a thickness of 188 μm; the functional layer is a diffusion functional layer and comprises 100 weight parts of polyurethane adhesive and 150 weight parts of SiO 2 The particle size of the diffusion particles is 25-35 mu m, the appearance is ellipsoidal, and the thickness of the diffusion functional layer is 20-40 mu m; the material of the bottom coating is polyacrylate, and the thickness of the coating is 2 mu m; the thickness of the blue light preventing layer coating is 6 mu m.
The blue light prevention coating liquid consists of the following components:
the structural formula of the cholesteric liquid crystal molecules is b, wherein n=4, and the weight parts are 89 weight parts; the chiral agent has a structural formula f, wherein q=1 and the weight part is 1 weight part; the photoinitiator is 1-hydroxy cyclohexyl phenyl ketone (184), and the weight part is 10; the polymerization inhibitor is 2-tertiary butyl hydroquinone, and the weight part is 0.5 part; the organic solvent is butanone, and the weight portion is 150 weight portions.
Example 12
The blue light preventing optical film according to embodiment 1, wherein the substrate layer is made of PC material and has a thickness of 75 μm; the functional layer is a diffusion functional layer and comprises 100 weight parts of epoxy resin adhesive and 90 weight parts of TiO 2 The particle size of the diffusion particles is 0.1-35 mu m, the appearance is ellipsoidal, and the thickness of the diffusion functional layer is 10-25 mu m; the material of the bottom coating is polysiloxane, and the thickness of the coating is 4 mu m; the thickness of the blue light preventing layer coating is 2 mu m.
The blue light prevention coating liquid consists of the following components:
the structural formula of the cholesteric liquid crystal molecules is c, wherein x=0 and y=0, and the weight parts are 80 weight parts; the chiral agent has a structural formula f, wherein q=3 and 15 parts by weight; the photoinitiator is 2-methyl-1- (4-methylthiophenyl) -2-morpholinyl-1-propanone (907) with 5 parts by weight; the polymerization inhibitor is 2-tertiary butyl hydroquinone, and the weight part is 0.4 part; the organic solvent is butanone, and the weight portion is 210 weight portions.
Comparative example 1
The blue light preventing optical film according to embodiment 1, wherein the substrate layer is made of PET and has a thickness of 100 μm; the functional layer is a diffusion functional layer and comprises 100 parts by weight of polyurethane adhesive and 90 parts by weight of PMMA diffusion particles, wherein the particle size of the diffusion particles is 10 mu m, and the appearance is spherical; the base coat is polyimide, and the thickness of the coating is 5 mu m. The comparative example is not provided with a blue light preventing layer.
Comparative example 2
The blue light preventing optical film according to embodiment 1, wherein the substrate layer is made of PET and has a thickness of 75 μm; the functional layer is a diffusion functional layer and comprises 100 parts by weight of polyurethane adhesive and 90 parts by weight of PMMA diffusion particles, wherein the particle size of the diffusion particles is 10 mu m, and the appearance is spherical; the material of the bottom coating is polyimide, and the thickness of the coating is 2 mu m; the thickness of the blue light preventing layer coating is 3 mu m.
The blue light prevention coating liquid consists of the following components:
the structural formula of the cholesteric liquid crystal molecules is c, wherein x=3 and y=3, and the weight parts are 95 weight parts; the chiral agent has a structural formula of e, wherein p=4 and the weight part is 0 weight part; the photoinitiator is 1-hydroxy cyclohexyl phenyl ketone (184), and the weight part is 5; the polymerization inhibitor is hydroquinone, and the weight part is 0.2 part; the organic solvent is cyclohexanone, and the weight part is 190.
Comparative example 3
The blue light preventing optical film according to embodiment 1, wherein the substrate layer is made of PET and has a thickness of 75 μm; the functional layer is a UV functional layer of a micro-prism structure, the micro-prism structure is made of acrylic resin, the height of prism strips of the micro-prism structure is 55 mu m, the edge angle is 90 degrees, and the prism strips are of equal-height linear type; the material of the bottom coating is polyimide, and the thickness of the coating is 7 mu m; the thickness of the blue light preventing layer coating is 3 mu m.
The blue light prevention coating liquid consists of the following components:
the structural formula of the cholesteric liquid crystal molecules is c, wherein x=3 and y=3, and the weight parts are 70 weight parts; the chiral agent has a structural formula of e, wherein p=4 and the weight part is 25 weight parts; the photoinitiator is 1-hydroxy cyclohexyl phenyl ketone (184), and the weight part is 5; the polymerization inhibitor is hydroquinone, and the weight part is 0.2 part; the organic solvent is cyclohexanone, and the weight part is 200 weight parts.
Comparative example 4
The blue light preventing optical film according to example 6, wherein step (3) was omitted in the preparation of the blue light preventing optical film, i.e., the undercoat layer was not subjected to rubbing orientation of step (3), the blue light preventing coating liquid was directly coated on the undercoat layer, and then uv-cured to obtain the blue light preventing layer.
Comparative example 5
The blue light preventing protective film prepared according to the existing preparation method of the blue light preventing protective film, in particular to the blue light preventing protective film prepared according to the preparation scheme in example 9 in the specification disclosed in Chinese patent CN 103935097A.
TABLE 1 comparative examples of the invention and optical property test of blue light preventing optical films obtained from the comparative examples
From the test results of examples 1-12 and comparative examples 1-5 shown in Table 1, the blue light preventing optical film provided by the invention has better light transmittance, higher brightness and optical performance with low color cast, and can selectively reflect blue light of a specific wave band while meeting the high-efficiency blue light blocking performance, thereby having higher blue light preventing effect. According to the invention, the pitch of the cholesteric liquid crystal blue light prevention layer is regulated and controlled by regulating the proportion of chiral agent in the blue light prevention coating liquid, so that the size of a blue light reflection peak value is regulated and controlled, and the blue light prevention optical film with the nearest blue light reflection peak value and a target central value (440 nm) is obtained. The larger the proportion of the chiral agent in the blue light prevention coating liquid is, the smaller the blue light reflection peak value is; the smaller the proportion of chiral agent in the blue light prevention coating liquid is, the larger the blue light reflection peak value is.
As can be seen from comparative analysis of example 6 and comparative example 4, the rubbing orientation of the primer layer in step (3) in the step of preparing the blue light preventing optical film can effectively improve the light transmittance of the blue light preventing protective film; comparative analyses of examples 1-12 and comparative examples 1 and comparative example 5 showed that the blue light protection prepared according to the present invention had smaller color coordinates (Wx and Wy), i.e., less color shift, and more acceptable appearance.
The blue light preventing optical films prepared in the embodiments 4-7 and 9 of the invention have higher light transmittance and brightness, lower color shift, higher blue light blocking rate and more ideal blue light reflection peak value. The light transmittance of the prepared blue light prevention optical film is at least 85.00%, the brightness is at least 3757, wx is less than or equal to 0.3297, and Wy is less than or equal to 0.3314; the blue light blocking rate is not lower than 40%, and the blue light reflection peak value is 431-448nm and is closer to the target central value. In particular, the blue light preventing optical films prepared in examples 5 and 6 have the best combination of properties, a light transmittance of at least 86.66%, a brightness of at least 3778, wx of 0.3246 or less, and Wy of 0.3304 or less; the blue light blocking rate is not lower than 42%, the blue light reflection peak values are 443nm and 437nm respectively, and the peak value is closest to the target central value of 440nm.
The foregoing description is only of the preferred embodiments of the present invention, and is not intended to limit the scope of the present invention. All equivalent changes and modifications made in accordance with the present invention are intended to be covered by the scope of the appended claims.
Claims (6)
1. The blue light prevention optical film is characterized by sequentially comprising a functional layer, a substrate layer, an undercoat layer and a blue light prevention layer; the blue light prevention layer comprises the following components: 75-90 parts by weight of cholesteric liquid crystal molecules; 1-20 parts of chiral agent, 1-10 parts of photoinitiator and 0.1-0.5 part of polymerization inhibitor; in the blue light prevention layer, the total weight of cholesteric liquid crystal molecules, chiral agents and photoinitiators is 100 parts by weight;
the cholesteric liquid crystal molecules are selected from one or a combination of at least two of cholesteric liquid crystal molecules with a structural formula a, a structural formula b or a structural formula c;
m in the structural formula a is an integer of 0-8; wherein n in structural formula b is an integer of 0 to 7; wherein x and y in structural formula c are integers of 0 to 7, respectively;
the chiral agent is selected from one or a combination of at least two chiral agents with a structural formula e or a structural formula f;
p in the structural formula e is an integer of 0-7; wherein n in the structural formula f is an integer of 0 to 8.
2. The blue light preventing optical film according to claim 1, wherein the blue light preventing optical film is composed of a base material, a functional layer, an undercoat layer, and a blue light preventing layer; one side of the base material layer is provided with a functional layer, and the other side of the base material layer is provided with an undercoat layer; and the other side of the bottom coating is provided with a blue light prevention layer.
3. The blue light preventing optical film according to claim 1, wherein the blue light preventing layer comprises the following components: 80-88 parts by weight of cholesteric liquid crystal molecules; 6-14 parts of chiral agent, 4-7 parts of photoinitiator and 0.2-0.3 part of polymerization inhibitor; m=4-6 in structural formula a; n=4 in structural formula b; x=3-4 and y=2-3 in structural formula c; p=4-5 in structural formula e; q=6-8 in structural formula f.
4. The blue light preventing optical film according to claim 1, wherein the functional layer is a diffusion functional layer or a brightness enhancing structural layer.
5. Use of a blue light protection optical film according to any one of claims 1 to 4, in the field of displays, LED screens or lighting.
6. A method of making the blue light-protected optical film of claim 1, said method comprising the steps of:
(1) Coating a functional layer coating liquid on one surface of the substrate layer, and curing to obtain a functional layer;
(2) Coating an undercoat coating liquid on the other surface of the substrate layer, and obtaining an undercoat after heating and curing;
(3) Rubbing the surface of the bottom coating by using a flannelette roller to enable grooves with consistent directions to be generated on the surface of the bottom coating after the surface of the bottom coating is rubbed;
(4) Coating blue light prevention coating liquid on the surface of the bottom coating, heating the surface to dry, and performing ultraviolet curing to obtain a blue light prevention layer; thus, the blue light preventing optical film is prepared.
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| CN113156571B (en) * | 2021-05-06 | 2023-06-13 | 湖南壹鑫科技有限公司 | Blue light preventing light guide plate, preparation method thereof, backlight module and liquid crystal display panel |
| CN114479693B (en) * | 2021-09-08 | 2023-12-19 | 纳琳威纳米科技（上海）有限公司 | Bird strike prevention optical flexible film and preparation method and application thereof |
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