CN113402976A - High-transmittance high-fog anti-glare coating - Google Patents
High-transmittance high-fog anti-glare coating Download PDFInfo
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- CN113402976A CN113402976A CN202110773435.XA CN202110773435A CN113402976A CN 113402976 A CN113402976 A CN 113402976A CN 202110773435 A CN202110773435 A CN 202110773435A CN 113402976 A CN113402976 A CN 113402976A
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D183/00—Coating compositions based on macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon, with or without sulfur, nitrogen, oxygen, or carbon only; Coating compositions based on derivatives of such polymers
- C09D183/04—Polysiloxanes
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D175/00—Coating compositions based on polyureas or polyurethanes; Coating compositions based on derivatives of such polymers
- C09D175/04—Polyurethanes
- C09D175/14—Polyurethanes having carbon-to-carbon unsaturated bonds
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Abstract
The invention discloses a high-transparency high-fog anti-glare coating, which comprises UV-curable boron-containing silicone resin (B-MDT), UV-curable acrylic resin, an active diluent, a photoinitiator and an auxiliary agent in percentage by weight: 10-70% of borosilicate-containing resin, 10-50% of acrylic resin, 10-70% of reactive diluent, 1-5% of photoinitiator and 5-9% of auxiliary agent. The coating ensures high transmittance and high haze on the basis of ensuring the anti-dazzle effect of the product, the transmittance of the coating on a film can reach more than 90 percent, and the haze is 60-85 percent; the traditional particle type film keeps the light transmittance more than 90 percent, and the haze is difficult to reach more than 75 percent.
Description
Technical Field
The invention belongs to the technical field of high polymer materials, and relates to an anti-glare coating with high light transmittance and high haze.
Background
Glare refers to the phenomenon that the range of light brightness in a visual field is not suitable, and extreme brightness contrast exists in space or time, so that the visual phenomenon of discomfort or visibility reduction is caused, the glare directly influences the labor efficiency of workers and the visual health of human bodies to a certain extent, and eye diseases and the like are caused when the glare is serious. Therefore, it is very important to take effective measures to prevent and treat glare so as to improve the visual health of people and improve the quality of life.
The anti-dazzle can be realized by controlling the light source, and can also be controlled in the transmission process of light, and the specular reflection of light is changed into diffuse reflection through the anti-dazzle film, so that the over-bright light reflection can be effectively weakened to enter human eyes, and the anti-dazzle effect is the simplest and most effective method. The principle of the method is that a layer of anti-glare coating is coated on the surface of an optical film, so that the light path is changed, the mutual interference of light rays is weakened, and the formation of glare is reduced.
The anti-glare film can diffuse light emitted from a light source inside the display due to the unique light scattering performance, and simultaneously reduce the regular reflection of external incident light, so that the anti-glare film is widely used in the field of liquid crystal display screens. At present, a common method for preparing an anti-glare film on a large scale is to coat a coating material containing inorganic or organic scattering particles on the surface of a transparent substrate by a wet coating process, and form a 'diffuse reflection' for incident light and a 'scattering' reduction 'glare' stimulus for transmitted light by using a concave-convex structure formed on the surface of the coating by the particles, so as to improve the visibility of a displayed image, for example, patents CN100538405, CN 102305965, CN104133257, CN202390356 and the like all adopt similar methods to realize an anti-glare function. However, in order to achieve high haze, such an anti-glare film must include more light scattering particles in the coating layer, and by stacking and superposing more light scattering particles, light is refracted and scattered, and haze is increased, which inevitably causes a decrease in light transmittance. And the situation that external strong light and light generated by an internal light source generate light scattering on the concave-convex part of the surface of the anti-dazzle layer can be met, so that the anti-dazzle layer looks whitish, the transmittance of the film is reduced, and the display contrast is reduced.
Disclosure of Invention
The invention aims to provide a high-transmittance and high-fog anti-glare coating, which solves the problems of whitening of an anti-glare layer, poor transmittance, low contrast during display and the like of the conventional anti-glare coating, ensures that a product has good anti-glare capability, keeps excellent transmittance and has good fog degree.
In order to achieve the purpose, the invention is realized by the following technical scheme:
a high-transparency high-fog anti-glare coating comprises UV-curable boron-containing silicone resin (B-MDT), UV-curable acrylic resin, a reactive diluent, a photoinitiator and an auxiliary agent, and the components are as follows by weight percent: 10-70% of borosilicate-containing resin, 10-50% of acrylic resin, 10-70% of reactive diluent, 1-5% of photoinitiator and 5-9% of auxiliary agent.
The boron-containing silicon resin is designed and synthesized autonomously and has the following structural formula:
the acrylic resin is selected from polyester acrylate resin, polyurethane acrylate resin or epoxy acrylate resin.
The reactive diluent is selected from polyester acrylate monomer, polyurethane acrylate monomer or epoxy acrylate resin monomer.
The photoinitiator is a free radical type photoinitiator or a cationic initiator, and the free radical type photoinitiator is selected from alpha hydroxy ketones, benzoyl, alpha amino ketones, phosphorus oxides, benzophenones or thioxanthone compounds.
The auxiliary agent is a general leveling agent, a wetting agent and a defoaming agent.
When the coating is used, a coating liquid is prepared according to 5-100 wt% of coating and 95-0 wt% of solvent.
The solvent is selected from isopropanol, ethyl acetate, butyl acetate or methyl isobutyl ketone.
The using conditions of the coating are as follows: drying for 5-10 minutes at 80-100 ℃ after coating, and then, entering a UV exposure machine for radiation curing with the radiation dose of 400-2000mJ/cm2。
The technical principle of the invention is as follows:
the coating system of the invention selects the boron-containing silicon resin and the acrylic resin which can be cured by UV, and the boron-containing silicon resin and the acrylic resin are limited compatible systems and can be completely dissolved in a cosolvent to form a cosolvent system or simultaneously dissolved in a reactive diluent. For a cosolvent system, in the solvent volatilization process, as the volatilization amount of an organic solvent is increased, resin is continuously separated out from the solvent, B-MDT and acrylic resin are incompatible and can generate phase separation, B-MDT has larger surface energy and tends to self-aggregate, finally, island structures with different particle size scales are formed inside and on the surface of a coating with the acrylic resin, as shown in figure 1, and island structures formed by B-MDT are higher than sea structures formed by the acrylic resin and generate the effect of surface unevenness, so that structures with different layers are formed, light rays are diffused and scattered at interfaces, and the anti-glare function and the high-haze effect are realized. Compared with the particle type glare film, the particle type glare film can only generate refraction and scattering at the interfaces where the particles are located, so the phase separation type glare film can realize higher haze in a thinner coating thickness and simultaneously has higher light transmittance. Meanwhile, as the B-MDT and the acrylic resin are both optically transparent resins, the light transmittance of the coating can be basically kept unchanged; in the case of B-MDT, acrylic resin, reactive diluent system, the phase separation process occurs in the UV curing stage, and during the curing process, since B-MDT and acrylic resin have only limited compatibility, microphase separation exists at the interface of the two, and the phase separation speed is increased with the increase of the curing degree, finally, a microscopically uneven structure is formed on the surface layer, and the morphological structure is shown in fig. 2.
The invention has the beneficial effects that:
the coating ensures high transmittance and high haze on the basis of ensuring the anti-dazzle effect of the product, the transmittance of the coating on a film can reach more than 90 percent, and the haze is 60-85 percent; the traditional particle type film keeps the light transmittance more than 90 percent, and the haze is difficult to reach more than 75 percent.
The invention utilizes the compatibility difference of polymers to generate phase separation in the curing process to form a two-phase structure with clear interface, and utilizes the particle size difference formed by the surface energy difference to form structures with different levels. The B-MDT has larger surface energy, tends to self-aggregate and has larger agglomerated particle size, finally forms a sea-island structure with obvious interface as shown in figure 1 with the acrylate resin, the island-shaped structure formed by the B-MDT is higher than the sea-shaped structure formed by the acrylate resin to generate the effect of surface unevenness, finally forms a microscopic uneven structure on the surface layer, and finally cures the coating structure by a UV exposure method, thereby achieving the purpose of reducing glare and simultaneously realizing the effect of high haze without influencing the transparency of the product.
The coating has the advantages of controllable production process, adjustable film surface performance, high efficiency and high yield, and is suitable for roll-to-roll continuous production.
Drawings
FIG. 1 is a graphical representation of the B-MDT/acrylic co-solvent system of the present invention;
FIG. 2 is a diagram of the B-MDT/acrylic resin/reactive diluent system of the present invention.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to specific embodiments of the present invention, and it should be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1 boron-containing Silicone resin
The boron-containing silicon resin is designed and synthesized independently, is formed by the reaction of a silane coupling agent KH570, borosiloxane resin and tetraphenyldimethylsilane, has the polymerization degree of 2-50, contains 3 acrylic esters and 2 boron molecules in each chain link, and has the reaction general formula:
example 2
The preparation of the high-transmittance and high-haze anti-glare film of the embodiment comprises the following steps: taking B-MDT45 wt% and carrying out photocuring45 wt% of resin, 10 wt% of photoinitiator and assistant, mixing B-MDT, photocuring resin, photoinitiator and organic solvent, dispersing for 15 minutes at high speed, wherein the dispersion speed is 1000-2000rpm, adding assistant, and continuing to disperse for 15 minutes at high speed to obtain coating liquid; coating the coating liquid on the surface of the optical PET film in a micro-concave coating or blade coating manner, wherein the thickness of the coating is 1-20 microns, drying the coating for 5-10 minutes at 80-100 ℃, and performing radiation curing in a UV exposure machine with the radiation dose of 400-2And the coating speed is 5-20 m/min, so that the high-transmittance and high-fog anti-glare film is obtained.
Wherein B-MDT is obtained by the method of example 1; the light-cured resin is aliphatic polyurethane hexaacrylate resin, Saedoma, model CN9013, abbreviated as 9013; the photoinitiator can be alpha hydroxy ketone, benzoyl, alpha aminoketone, phosphorus oxide, benzophenone, thioxanthone compound or cationic initiator; the solvent is selected from ethyl acetate or butyl acetate.
The film was a 188 μm transparent PET optical film, the light source was a UV mercury lamp, the center wavelength was 365nm, and the properties of the obtained product were as shown in Table 1.
Example 3
The preparation of the high-transmittance and high-haze anti-glare film of the embodiment comprises the following steps: taking 20 wt% of B-MDT20wt, 20 wt% of light-cured resin, 50 wt% of reactive diluent, 10 wt% of photoinitiator and auxiliary agent, mixing the B-MDT, the light-cured resin, the reactive diluent, the photoinitiator and the organic solvent, dispersing for 15 minutes at a high speed, wherein the dispersion speed is 1000-2000rpm, then adding the auxiliary agent, and continuing to disperse for 15 minutes at a high speed to obtain a coating liquid; coating the coating liquid on the surface of the optical PET film in a micro-concave coating or blade coating manner, wherein the thickness of the coating is 1-20 microns, drying the coating for 5-10 minutes at 80-100 ℃, and performing radiation curing in a UV exposure machine with the radiation dose of 400-2And the coating speed is 5-20 m/min, so that the high-transmittance and high-fog anti-glare film is obtained.
Wherein B-MDT is obtained by the method of example 1; the light-cured resin is aliphatic polyurethane hexaacrylate resin, Saedoma, model CN9013, abbreviated as 9013; the reactive diluent is ethylene glycol dimethacrylate, sartomer, model SR206, abbreviated as 206; the photoinitiator can be alpha hydroxy ketone, benzoyl, alpha aminoketone, phosphorus oxide, benzophenone, thioxanthone compound or cationic initiator; the solvent is selected from ethyl acetate or butyl acetate.
The film was a 188 μm transparent PET optical film, the light source was a UV mercury lamp, the center wavelength was 365nm, and the properties of the obtained product were as shown in Table 1.
Example 4
The preparation of the high-transmittance and high-haze anti-glare film of the embodiment comprises the following steps: taking 70 wt% of B-MDT70wt, 20 wt% of light-cured resin, 10 wt% of photoinitiator and auxiliary agent, mixing the B-MDT, the light-cured resin, the photoinitiator and the organic solvent, dispersing for 15 minutes at a high speed, wherein the dispersion speed is 1000-2000rpm, then adding the auxiliary agent, and continuing to disperse for 15 minutes at a high speed to obtain a coating liquid; coating the coating liquid on the surface of the optical PET film in a micro-concave coating or blade coating manner, wherein the thickness of the coating is 1-20 microns, drying the coating for 5-10 minutes at 80-100 ℃, and performing radiation curing in a UV exposure machine with the radiation dose of 400-2And the coating speed is 5-20 m/min, so that the high-transmittance and high-fog anti-glare film is obtained.
Wherein B-MDT is obtained by the method of example 1; the light-cured resin is aliphatic polyurethane hexaacrylate resin, Saedoma, model CN9013, abbreviated as 9013; the photoinitiator can be alpha hydroxy ketone, benzoyl, alpha aminoketone, phosphorus oxide, benzophenone, thioxanthone compound or cationic initiator; the solvent is selected from ethyl acetate or butyl acetate.
The film was a 188 μm transparent PET optical film, the light source was a UV mercury lamp, the center wavelength was 365nm, and the properties of the obtained product were as shown in Table 1.
Example 5
The preparation of the high-transmittance and high-haze anti-glare film of the embodiment comprises the following steps: taking 20 wt% of B-MDT, 70% of light-cured resin, 10% of photoinitiator and auxiliary agent, mixing the B-MDT, the light-cured resin, the photoinitiator and the organic solvent, dispersing for 15 minutes at a high speed, wherein the dispersion speed is 1000-2000rpm, then adding the auxiliary agent, and continuing to disperse for 15 minutes at a high speed to obtain a coating liquid; coating with dimplesOr coating the coating liquid on the surface of the optical PET film in a blade coating mode, wherein the thickness of the coating layer is 1-20 microns, drying the optical PET film for 5-10 minutes at the temperature of 80-100 ℃, and then performing radiation curing in a UV exposure machine with the radiation dose of 400-2000mJ/cm2And the coating speed is 5-20 m/min, so that the high-transmittance and high-fog anti-glare film is obtained.
Wherein B-MDT is obtained by the method of example 1; the light-cured resin is aliphatic polyurethane hexaacrylate resin, Saedoma, model CN9013, abbreviated as 9013; the photoinitiator can be alpha hydroxy ketone, benzoyl, alpha aminoketone, phosphorus oxide, benzophenone, thioxanthone compound or cationic initiator; the solvent is selected from ethyl acetate or butyl acetate.
The film was a 188 μm transparent PET optical film, the light source was a UV mercury lamp, the center wavelength was 365nm, and the properties of the obtained product were as shown in Table 1.
Example 6
The preparation of the high-transmittance and high-haze anti-glare film of the embodiment comprises the following steps: mixing B-MDT40 wt%, photocuring resin 40 wt%, reactive diluent 10 wt%, photoinitiator and auxiliary agent 10 wt%, dispersing for 15 minutes at high speed at the dispersion speed of 1000-2000rpm, adding auxiliary agent, and continuously dispersing for 15 minutes at high speed to obtain coating liquid; coating the coating liquid on the surface of the optical PET film in a micro-concave coating or blade coating manner, wherein the thickness of the coating is 1-20 microns, drying the coating for 5-10 minutes at 80-100 ℃, and performing radiation curing in a UV exposure machine with the radiation dose of 400-2And the coating speed is 5-20 m/min, so that the high-transmittance and high-fog anti-glare film is obtained.
Wherein B-MDT is obtained by the method of example 1; the light-cured resin is aliphatic polyurethane hexaacrylate resin, Saedoma, model CN9013, abbreviated as 9013; the reactive diluent is ethylene glycol dimethacrylate, sartomer, model SR206, abbreviated as 206; the photoinitiator can be alpha hydroxy ketone, benzoyl, alpha aminoketone, phosphorus oxide, benzophenone, thioxanthone compound or cationic initiator; the solvent is selected from ethyl acetate or butyl acetate.
The film was a 188 μm transparent PET optical film, the light source was a UV mercury lamp, the center wavelength was 365nm, and the properties of the obtained product were as shown in Table 1.
TABLE 1 examples 2 to 6
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (7)
1. The high-transparency high-fog anti-glare coating is characterized by comprising, by weight, 10-70% of borosilicate-containing resin, 10-50% of acrylic resin, 10-70% of reactive diluent, 1-5% of photoinitiator and 5-9% of auxiliary agent.
2. The high-transparency high-haze anti-glare coating according to claim 1, wherein the boron-containing silicone resin is:
3. the high-transparency high-fog anti-glare coating as claimed in claim 1, wherein the acrylic resin is selected from polyester acrylate resin, polyurethane acrylate resin or epoxy acrylate resin.
4. The high-transparency high-fog anti-glare coating according to claim 1, wherein the reactive diluent is selected from a polyester acrylate monomer, a polyurethane acrylate monomer or an epoxy acrylate resin monomer.
5. The high-transparency high-fog anti-glare coating according to claim 1, wherein the coating solution is prepared according to the proportion of 5-100 wt% of the coating and 95-0 wt% of the solvent.
6. The high-transparency high-haze anti-glare coating as claimed in claim 5, wherein the coating is dried at 80-100 ℃ for 5-10 minutes and then cured by UV exposure with a radiation dose of 400-2000mJ/cm2。
7. A boron-containing silicone resin having the structural formula of claim 2.
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