CN115851087A - Blue light diffusion preventing coating and application thereof - Google Patents
Blue light diffusion preventing coating and application thereof Download PDFInfo
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Abstract
The invention belongs to the field of optical coatings, and discloses a blue light diffusion preventing coating and application thereof. The paint comprises, by mass, 100 parts of hyperbranched acrylic ester, 20-200 parts of polymerizable nematic liquid crystal monomer, 0.4-50 parts of chiral agent, 0.4-50 parts of cholesterol ester liquid crystal monomer, 10-100 parts of acrylate reactive diluent, 5-50 parts of light diffusion particles, 5-20 parts of photoinitiator, 1-5 parts of silane coupling agent, 1-5 parts of flatting agent and 1-5 parts of defoaming agent. The coating can be coated on the surfaces of optical films such as PET, PC and the like to prepare a blue light diffusion preventing film applied to a backlight module. The coating can be coated on transparent plates such as PC, PMMA and the like to prepare the blue-light-proof lampshade. The invention has simple process and no solvent, and does not cause pollution to the environment. And the light diffusion film has the effect of preventing blue light, and the thickness of the backlight module can not be increased.
Description
Technical Field
The invention belongs to the field of optical coatings, and relates to a coating with blue light prevention and light diffusion functions.
Background
The light diffusion coating is coated on optical films such as PET, PC, PMMA and the like or light diffusion films or plates made on the surfaces of the optical films or plates, can change point light sources into surface light sources, has high light transmittance and high haze and covers the shape of a backlight source. The backlight module and the LED lampshade are used for display screens of various electronic products. These sources contain a large amount of high energy short wavelength blue light. The short wavelength blue light can penetrate through the crystalline lens to reach the retina, so that certain damage is caused to the eyes, and visual fatigue is easily caused. Especially, the use of a large number of electronic products and LED lights in modern society causes serious damage to the eyesight of people. Cholesteric liquid crystals have a periodic helical structure. Different pitch lengths may selectively reflect light of corresponding wavelengths. When the pitch length is 400-450 nm, the blue light can be reflected, so that the blue light-proof LED can be applied to the field of blue light prevention. Chinese patent CN202111032891.5 (application number) uses metal complex dye to prepare blue light diffusion preventing film. The blue light prevention performance of the aqueous diffusion film is improved by using the blue light prevention metal complex, the blocking rate of the blue light is greatly improved, the damage of the blue light to eyes of people is reduced, the carboxyl coordination of the carboxyl ligand of the blue light prevention metal complex and the aqueous photocuring polyurethane resin is carried out, the compatibility and the light transmittance are improved, but the metal complex dye contains heavy metal and causes certain harm to the environment and human bodies. Patent CN202110029896.6 (application number) discloses a novel blue-light-proof coating, and a light guide plate and processing equipment and method using the same, wherein a cholesteric blue-light-proof coating is adopted, but in order to reduce the viscosity of the system and facilitate construction, a large amount of organic solvent is required to be added, the organic solvent does not participate in reaction, and the coating can be cured only by being volatilized into the air, which easily causes environmental pollution.
Disclosure of Invention
Aiming at the conditions of color cast distortion, heavy metal pollution, organic solvent pollution and the like existing in the existing blue light prevention technology, the invention combines the light diffusion function to prepare the blue light prevention light diffusion coating. A coating has both blue light and light diffusion resistance. The light diffusion film or sheet prepared using such a coating does not add extra thickness bulk.
The technical scheme of the invention is as follows:
the blue light diffusion preventing paint comprises, by mass, 100 parts of hyperbranched acrylic ester, 20-200 parts of polymerizable nematic liquid crystal monomer, 0.4-50 parts of chiral agent, 0.4-50 parts of cholesterol ester liquid crystal monomer, 10-100 parts of acrylate reactive diluent, 5-50 parts of light diffusion particles, 5-20 parts of photoinitiator, 1-5 parts of silane coupling agent, 1-5 parts of leveling agent and 1-5 parts of defoaming agent.
Preferably, the hyperbranched acrylate is hyperbranched polyester acrylate or hyperbranched polyurethane acrylate.
Preferably, the functionality of the hyperbranched polyester acrylate or hyperbranched polyurethane acrylate is from 4 to 20.
Preferably, the hyperbranched polyester acrylate or hyperbranched polyurethane acrylate is of the type Changxing DR-E528, 4219, boxing B574C, HC451F, HD2280.
Preferably, the polymerizable nematic liquid crystal monomer contains 1 to 2 acrylate polymerizable end groups.
Preferably, the polymerizable nematic liquid crystal monomer is LC242, RM257, RM82.
Preferably, the chiral agent is one or more of right-handed chiral agents R811, R5011, R1011 and R6N or left-handed chiral agents S811, S5011, S1011 and S6N, which are used in a compounding way, but the left-handed chiral agent and the right-handed chiral agent cannot be mixed.
Preferably, the cholesterol ester liquid crystal monomer is one or more of cholesterol pelargonate, cholesterol myristate, cholesterol oleate and cholesterol benzoate.
Preferably, the acrylate reactive diluent is hydroxyethyl methacrylate, hydroxyethyl acrylate, isobornyl methacrylate, HDDA, TEGDA, TPGDA, PDDA.
Preferably, the light diffusion particles are spherical light diffusion particles.
Preferably, the photoinitiator is one or more of 184, TPO,1173, 651, 819 and 127.
Preferably, the silane coupling agent is an epoxy silane coupling agent, an amino silane coupling agent, a phenyl silane coupling agent or a double bond-containing silane coupling agent.
Preferably, the leveling agent is one of an acrylate leveling agent, an organic silicon leveling agent or an organic fluorine leveling agent, or is used in a compounding way.
Preferably, the defoamer is a silicone defoamer.
Preferably, the light diffusion particles are one of spherical organosilicon light diffusion particles, spherical polymethacrylate light diffusion particles and spherical silica particles; the diameter of the light diffusion particle is 1-15um.
Preferably, the silane coupling agent is KH550, KH560, KH570, a1121, a1160, 6040.
Preferably, the leveling agent is BYK333, BYK358N, BYK370.
Preferably, the antifoaming agent is modesty 6800, winning Tego900, dow corning AFE7610, dow DF103.
The blue light-proof light diffusion coating is applied to the preparation of a light diffusion film or a light diffusion plate.
Compared with the prior art, the invention has the following beneficial effects:
(1) The invention combines the blue light prevention effect of cholesteric liquid crystal into the light diffusion coating, the light diffusion particles uniformly distributed in the coating can change a point light source into a surface light source, and the silane coupling agent plays a role in connecting the light diffusion particles with resin. The light diffusion film or the light diffusion plate prepared by using the method has simple process and no solvent, and cannot pollute the environment. And the light diffusion film has the effect of preventing blue light, and the thickness of the backlight module can not be increased.
(2) The introduction of the cholesteric liquid crystal enables the cholesteric liquid crystal to have the blue light prevention function, simultaneously can not cause color cast and distortion, has high light transmittance, does not contain heavy metal and has no pollution.
(3) The color development of cholesteric liquid crystals is easily lost by mixing incompatible impurities into the liquid crystal system. The invention adds the hyperbranched acrylic ester with good compatibility with the liquid crystal system, and does not influence the color development of cholesteric liquid crystal. Meanwhile, the surface hardness and the scratch resistance of the coating are improved.
(4) The coating does not contain heavy metal, does not use organic solvent, uses monofunctional or difunctional acrylate as an active diluent, can reduce the viscosity of the low-viscosity acrylic monomer with double bonds, simultaneously participates in reaction and is solidified into a film, and is an environment-friendly coating.
(5) The invention combines blue light prevention and light diffusion functions into one coating, can obtain the blue light prevention light diffusion coating by one-time coating, and has simple process. The prepared blue light diffusion preventing film can be applied to a backlight module of an electronic product, and the volume of the backlight module cannot be increased. The manufactured blue light prevention light diffusion plate can be applied to a blue light prevention lampshade.
Detailed Description
The present invention will be described in further detail with reference to specific examples, but the embodiments of the present invention are not limited thereto, and may be carried out with reference to conventional techniques for process parameters not particularly noted.
The polymerizable liquid crystal monomer, the chiral agent and the cholesterol ester liquid crystal monomer in the formula are heated, melted and cooled to prepare mixed crystals. Mixing the mixed crystal with other components uniformly.
Example 1
100 parts of hyperbranched polyester acrylate DR-E528, 50 parts of polymerizable nematic liquid crystal monomer LC242, 10 parts of chiral agent R5011, 20 parts of cholesterol oleate liquid crystal monomer, 10 parts of HDDA, 5 parts of organosilicon light diffusion particles with the diameter of 5um, 5 parts of photoinitiator TPO, 5 parts of silane coupling agent KH550, 1 part of leveling agent BYK370 and 6800 parts of defoaming agent D.
Example 2
100 parts of hyperbranched polyurethane acrylate 4219, 100 parts of polymerizable nematic liquid crystal monomer RM82, 25 parts of chiral agent R811, 50 parts of cholesterol pelargonate liquid crystal monomer, 20 parts of hydroxyethyl acrylate, 20 parts of polymethacrylate light diffusion particles with the diameter of 2um, 651 7 parts of photoinitiator, KH570 2 parts of silane coupling agent, 2 parts of flatting agent BYK333 and 900 parts of defoaming agent Tego.
Example 3
100 parts of hyperbranched polyurethane acrylate HC451F, 200 parts of polymerizable nematic liquid crystal monomer RM257, 50 parts of chiral agent S811, 10 parts of cholesterol myristate liquid crystal monomer, 50 parts of isobornyl methacrylate, 50 parts of 2um spherical silica, 20 parts of photoinitiator 184, 6040 parts of silane coupling agent, 3 parts of leveling agent BYK358N and 103 parts of defoaming agent DF.
Example 4
Hyperbranched polyester acrylate DR-E528100 parts, polymerizable nematic liquid crystal monomer LC242 100 parts, chiral agent R5011 parts, cholesterol oleate liquid crystal monomer 10 parts, acrylate HDDA 50 parts, organosilicon light diffusion particles with the diameter of 5um 10 parts, photoinitiator TPO 10 parts, silane coupling agent KH550 parts, flatting agent BYK370 1 parts, and defoaming agent Demodex 6800 parts.
Example 5
100 parts of hyperbranched polyurethane acrylate 4219, 150 parts of polymerizable nematic liquid crystal monomer RM82, 5011 parts of chiral agent R5015 parts, 15 parts of cholesterol pelargonate liquid crystal monomer, 20 parts of hydroxyethyl acrylate, 50 parts of polymethacrylate light diffusion particles with the diameter of 2um, 651 8 parts of photoinitiator, KH570 parts of silane coupling agent, 2 parts of flatting agent BYK333 and 900 parts of defoaming agent Tego.
Example 6
Hyperbranched polyurethane acrylate HD2280 parts, polymerizable nematic liquid crystal monomer RM257 parts, chiral agent S6N 50 parts, cholesterol myristate liquid crystal monomer 5 parts, isobornyl methacrylate 50 parts, 10um spherical silica 50 parts, photoinitiator 184 parts, silane coupling agent 6040 parts, leveling agent BYK358N 3 parts and defoaming agent DF103 3 parts.
Example 7
100 parts of hyperbranched polyester acrylate B574C, 100 parts of polymerizable nematic liquid crystal monomer LC242, 10 parts of chiral agent R5011, 10 parts of cholesterol oleate liquid crystal monomer, 50 parts of HDDA, 10 parts of organosilicon light diffusion particles with the diameter of 5um, 10 parts of photoinitiator TPO, 3 parts of silane coupling agent KH550, 1 part of flatting agent BYK370 and 6800 parts of defoaming agent.
Example 8
Hyperbranched polyurethane acrylate HD2280 parts, polymerizable nematic liquid crystal monomer RM82 parts, chiral agent R5015 parts, cholesterol pelargonate liquid crystal monomer 15 parts, hydroxyethyl acrylate 20 parts, polymethacrylate light diffusion particles with the diameter of 2um 20 parts, photoinitiator 651 8 parts, silane coupling agent KH5703 parts, flatting agent BYK333 2 parts, and defoaming agent Tego900 parts.
Example 9
100 parts of hyperbranched polyurethane acrylate 4219, 50 parts of polymerizable nematic liquid crystal monomer RM82, 25 parts of chiral agent R811, 10 parts of cholesterol pelargonate liquid crystal monomer, 30 parts of TEGDA, 50 parts of polymethacrylate light diffusion particles with the diameter of 2um, 651 7 parts of photoinitiator, KH570 2 parts of silane coupling agent, 333 2 parts of flatting agent BYK333 and 900 parts of defoaming agent Tego.
Example 10
100 parts of hyperbranched polyester acrylate DR-E528, 160 parts of polymerizable nematic liquid crystal monomer LC242, 10 parts of chiral agent R5011, 10 parts of cholesterol benzoate liquid crystal monomer, 10 parts of PDDA, 30 parts of organosilicon light diffusion particles with the diameter of 5um, 5 parts of photoinitiator TPO, 550 parts of silane coupling agent KH, 370 parts of flatting agent BYK, and 6800 parts of defoaming agent.
Comparative example 1
100 parts of hyperbranched polyester acrylate DR-E528, 50 parts of polymerizable nematic liquid crystal monomer LC242, 10 parts of chiral agent R5011, 20 parts of cholesterol oleate liquid crystal monomer, 10 parts of HDDA, 5 parts of photoinitiator TPO,1 part of leveling agent BYK370 and 6800 parts of defoaming agent.
Comparative example 2
200 parts of polymerizable nematic liquid crystal monomer RM257, 50 parts of chiral agent S811, 10 parts of cholesterol myristate liquid crystal monomer, 50 parts of isobornyl methacrylate, 50 parts of 2um spherical silica, 184 parts of photoinitiator, 6040 parts of silane coupling agent 6040, 3 parts of flatting agent BYK358N and 103 parts of defoaming agent DF 3.
Comparative example 3
100 parts of hyperbranched polyurethane acrylate 4219, 100 parts of polymerizable nematic liquid crystal monomer RM82, 25 parts of chiral agent R811, 50 parts of cholesterol pelargonate liquid crystal monomer, 20 parts of hydroxyethyl acrylate, 20 parts of polymethacrylate light diffusion particles with the diameter of 2um, 651 7 parts of photoinitiator, 333 parts of flatting agent BYK333 and 900 parts of defoaming agent Tego.
The properties of the coatings obtained in examples 1 to 10 according to the invention are given in table 1 below.
TABLE 1
| Examples | Transmittance (a) | Haze/% | Blue light rejection/%) | Hardness of coating surface |
| 1 | 91.4 | 88.0 | 25 | 3H |
| 2 | 91.0 | 88.5 | 28 | 2H |
| 3 | 91.8 | 90.0 | 29 | H |
| 4 | 92.9 | 87.6 | 31 | 2H |
| 5 | 92.3 | 89.3 | 30 | H |
| 6 | 92.6 | 90.0 | 29 | H |
| 7 | 90.5 | 88.4 | 28 | 3H |
| 8 | 90.0 | 90.0 | 29 | 2H |
| 9 | 93.0 | 88.9 | 25 | 3H |
| 10 | 92.8 | 88.8 | 30 | 2H |
| Comparative example 1 | 90.0 | 3.0 | 24 | 2H |
| Comparative example 2 | 90.5 | 90.0 | 30 | HB |
| Comparative example 3 | 88.0 | 91.0 | 31 | 2H |
The method for testing the light transmittance of the coating comprises the following steps: transmittance haze meter SGW-810, visible light band.
The coating surface pencil hardness test method comprises the following steps: GB/T6739-2006.
The blue light blocking rate test method comprises the following steps: an ultraviolet-visible spectrophotometer.
The above embodiments are preferred embodiments of the present invention, but the present invention is not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be construed as equivalents thereof, and all such changes, modifications, substitutions, combinations, and simplifications are intended to be included in the scope of the present invention.
Claims (10)
1. The blue light-diffusion-preventing coating is characterized by comprising, by mass, 100 parts of hyperbranched acrylic ester, 20-200 parts of polymerizable nematic liquid crystal monomer, 0.4-50 parts of chiral agent, 0.4-50 parts of cholesterol ester liquid crystal monomer, 10-100 parts of acrylate reactive diluent, 5-50 parts of light-diffusion particles, 5-20 parts of photoinitiator, 1-5 parts of silane coupling agent, 1-5 parts of flatting agent and 1-5 parts of defoaming agent.
2. The blue-light diffusion preventing coating of claim 1, wherein the hyperbranched acrylate is hyperbranched polyester acrylate or hyperbranched polyurethane acrylate.
3. The blue-light diffusion preventing coating according to claim 2, wherein the functionality of the hyperbranched polyester acrylate or hyperbranched polyurethane acrylate is 4 to 20.
4. The blue-light diffusion preventing coating according to claim 2, wherein the hyperbranched polyester acrylate or hyperbranched polyurethane acrylate is of the type Hakking DR-E528, 4219, bokking B574C, HC451F, HD2280.
5. The blue-light diffusion preventing coating according to claim 1, wherein the polymerizable nematic liquid crystal monomer contains 1 to 2 acrylate polymerizable end groups.
6. The coating of claim 5, wherein the polymerizable nematic liquid crystal monomer is LC242, RM257, RM82.
7. The blue-light diffusion preventing coating as claimed in any one of claims 1 to 6, wherein the chiral agent is one or more of a right-handed chiral agent R811, R5011, R1011, R6N or a left-handed chiral agent S811, S5011, S1011, S6N, but the left-handed and the right-handed chiral agents cannot be mixed;
the cholesterol ester liquid crystal monomer is one or more of cholesterol pelargonate, cholesterol myristate, cholesterol oleate and cholesterol benzoate;
the acrylate active diluent is hydroxyethyl methacrylate, hydroxyethyl acrylate, isobornyl methacrylate, HDDA, TEGDA, TPGDA and PDDA;
the light diffusion particles are spherical light diffusion particles;
the photoinitiator is one or more than two of 184, TPO,1173, 651, 819 and 127;
the silane coupling agent is an epoxy silane coupling agent, an amino silane coupling agent, a phenyl silane coupling agent or a silane coupling agent containing double bonds;
the leveling agent is one of an acrylate leveling agent, an organic silicon leveling agent or an organic fluorine leveling agent, or more than two of the leveling agents are used in a compounding way;
the defoaming agent is an organic silicon defoaming agent.
8. The blue-light-diffusion-preventing coating material of claim 7, wherein the light-diffusion particles are one of spherical silicone light-diffusion particles, spherical polymethacrylate light-diffusion particles and spherical silica particles; the diameter of the light diffusion particle is 1-15um.
9. The blue-light diffusion preventing coating according to claim 8, wherein the silane coupling agent is KH550, KH560, KH570, A1121, A1160, 6040;
the leveling agent is BYK333, BYK358N or BYK370;
the antifoaming agents are modesty 6800, yingchuo Tego900, dow Corning AFE7610, and Dow DF103.
10. The use of the blue-light preventing light diffusion coating according to claim 9 in the preparation of a light diffusion film or a light diffusion plate.
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