CN111548659A - Novel UV cured substance and MINI LED fluorescent film prepared from same - Google Patents

Novel UV cured substance and MINI LED fluorescent film prepared from same Download PDF

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CN111548659A
CN111548659A CN202010486210.1A CN202010486210A CN111548659A CN 111548659 A CN111548659 A CN 111548659A CN 202010486210 A CN202010486210 A CN 202010486210A CN 111548659 A CN111548659 A CN 111548659A
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cured product
monomer
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resin
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颜俊雄
刘筱
豆帆
周小平
李喆雨
洪海哲
刘天用
刘海燕
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Yantai Bright Photoelectric Material Co ltd
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    • GPHYSICS
    • G02OPTICS
    • G02FOPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
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    • GPHYSICS
    • G02OPTICS
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    • G02F1/00Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333Constructional arrangements; Manufacturing methods
    • G02F1/1335Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336Illuminating devices
    • G02F1/133614Illuminating devices using photoluminescence, e.g. phosphors illuminated by UV or blue light

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Abstract

The invention relates to a novel UV cured product, which comprises 10-50% of fluorescent powder, 10-50% of a light-cured monomer, 5-50% of a silicon-containing monomer, 2-30% of organic silicon modified UV resin and 0.01-5% of a photoinitiator according to the percentage content of the total mass of the UV cured product; the fluorescent powder is the combination of KSF and beta-SiAlON. And mixing the fluorescent powder, the light curing monomer, the silicon-containing monomer, the organic silicon modified UV resin and the photoinitiator, and stirring and defoaming by using a revolution stirring defoaming machine at the speed of 1000rpm to obtain the UV cured material. The UV cured product was coated on a PET film, and irradiated with ultraviolet rays to form a MINI LED fluorescent film. The UV cured material has high stability and excellent optical characteristics under high temperature and high humidity conditions.

Description

Novel UV cured substance and MINI LED fluorescent film prepared from same
Technical Field
The invention relates to a novel UV cured substance and a MINI LED fluorescent membrane prepared from the same, belonging to the technical field of LED luminescent materials.
Background
At present, the light-emitting scheme of LED illumination is still a method for combining a blue light chip and a fluorescent conversion material, and a light-emitting device manufactured by the scheme has excellent light-emitting characteristics, but has many poor characteristics due to the defects of fluorescent powder. For example, KSF and beta-SiAlON series fluorescent powder are used under the conditions of high temperature and high humidity, the light decay is too fast, the normal use of a lighting device is not facilitated, the improvement of the optical characteristics of the fluorescent powder, such as heat resistance, moisture resistance and the like, is urgently needed, or the optical characteristics are improved by other methods.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a novel UV cured substance and a MINI LED fluorescent membrane prepared by the same, wherein the UV cured substance has higher stability and excellent optical characteristics under high-temperature and high-humidity conditions.
The technical scheme for solving the technical problems is as follows: the novel UV cured product comprises, by weight, 10-50% of fluorescent powder, 10-50% of a light-cured monomer, 5-50% of a silicon-containing monomer, 2-30% of organosilicon-modified UV resin and 0.01-5% of a photoinitiator;
and mixing the fluorescent powder, the light curing monomer, the silicon-containing monomer, the organic silicon modified UV resin and the photoinitiator, and stirring and defoaming by using a revolution stirring defoaming machine at the speed of 1000rpm to obtain the UV cured material.
When the dosage of the photo-curing monomer is less than 10%, incomplete curing can occur, and when the dosage of the photo-curing monomer exceeds 50%, printability can be affected, and the preferred dosage of the photo-curing monomer is 10-40%; the silicon-containing monomer is a monomer having double bonds on both sides, and the monomer having double bonds on both sides of silicon can be applied to the present invention regardless of molecular weight, and has the following structural formula C-1:
Figure BDA0002519158340000011
the dosage of the silicon-containing monomer is 5-50%, and the preferred dosage of the silicon-containing monomer is 10-30%; the dosage of the organic silicon modified UV resin is 2-30%, and the preferred dosage of the organic silicon modified UV resin is 2-20%; the preferable amount of the photoinitiator is 0.01 to 5%, when the amount of the photoinitiator is less than 0.01%, the UV cured product of the backlight portion cannot be sufficiently cured, when the amount of the photoinitiator exceeds 5%, the UV cured product may have a yellowing phenomenon, and the photoinitiator may not be sufficiently dissolved in the UV cured product.
Preferably, the fluorescent powder is a combination of KSF and beta-SiAlON, the weight of the KSF accounts for 60% -80% of that of the fluorescent powder, and the weight of the beta-SiAlON accounts for 20% -40% of that of the fluorescent powder.
Preferably, the light-cured monomer is one or more of polyurethane acrylic oligomer, 1-functional acrylic light-cured monomer and multifunctional acrylic light-cured monomer.
The basic structure of the polyurethane acrylic oligomer is composed of a molecular formula middle position soft section (a polymerization part) and two end hard sections (a polyurethane acrylic part and an isocyanate part). The polyurethane acrylic oligomer, the 1 functional acrylic light-cured monomer and the multifunctional acrylic light-cured monomer form a cross-linked polymer with a reticular structure together, and a soft and tough film with excellent adhesiveness with a base material is formed in a short time. The invention adopts the combination of polyurethane acrylic oligomer, 1 functional acrylic light-cured monomer and multifunctional acrylic light-cured monomer, can maintain lower viscosity although the proportion of fluorescent powder is high, and does not influence light neutralization reaction, thereby having good printing performance;
the polyurethane acrylic oligomer, the 1-functional acrylic photocuring monomer and the multifunctional acrylic photocuring monomer contain a color photoresist, and the photoactive monomer in the color photoresist is a multifunctional monomer containing 2 or more than 2 unsaturated double-bond compounds and can generate polymerization crosslinking reaction under the action of a photoinitiator; the photoactive monomer is one or more of vinyl ether monomers or acrylate monomers, preferably one or more of hydroxybutyl vinyl ether, pentaerythritol tetraacrylate, hydroxybutyl vinyl alcohol and methoxypolyethylene glycol monomethacrylate; the composition can be hydroxybutyl vinyl ether and pentaerythritol tetraacrylate composition, and also can be hydroxybutyl vinyl alcohol, pentaerythritol tetraacrylate and methoxypolyethylene glycol monomethacrylate composition, when various substances are mixed, the proportion can be increased or decreased according to the requirement of adjusting the exposure time;
the polyurethane acrylic fiber oligomer, the 1-functional acrylic fiber photocuring monomer and the multifunctional acrylic fiber photocuring monomer contain vinyl ether monomers, the vinyl ether monomers can adjust the viscosity of a curing system and participate in cationic polymerization reaction, and the antioxidant polymerization inhibition performance of the photocuring system is effectively improved, wherein the vinyl ether monomers comprise hydroxybutyl vinyl ether, hydroxybutyl vinyl alcohol, triethylene glycol divinyl ester and 2-ethylhexyl vinyl ether;
the polyurethane acrylic fiber oligomer, the 1-functional acrylic fiber photocuring monomer and the multifunctional acrylic fiber photocuring monomer contain acrylate monomers, and the acrylate monomers can contain bifunctional groups or polyfunctional groups and can be effectively crosslinked and polymerized. Wherein, the bifunctional group acrylate monomer is selected from one or more of 1, 6-hexanediol diacrylate, dipropylene glycol diacrylate, tripropylene glycol diacrylate, tetraethoxy modified bisphenol A diacrylate and polyethylene glycol diacrylate; the multifunctional acrylate monomer is one or more selected from trimethylolpropane triacrylate, pentaerythritol tetraacrylate, dipentaerythritol pentaacrylate, dipentaerythritol hexaacrylate, ditrimethylolpropane tetraacrylate, ethoxylated trimethylolpropane triacrylate and propoxylated glycerol triacrylate.
Preferably, the multifunctional acrylic fiber photocuring monomer is one or more of 4-functional acrylic fibers, 3-functional acrylic fibers and 2-functional acrylic fibers.
Preferably, the multifunctional acrylic fiber photocuring monomer comprises the combination of 2-functional acrylic fibers and any one of 4-functional acrylic fibers and 3-functional acrylic fibers.
Preferably, the organosilicon modified UV resin is obtained by chemical reaction of a UV resin monomer and a silane coupling agent; the compound (D-1) can be obtained by chemical reaction of general purpose TINUVIN-1130 and silane with isocyanate group, and the following reaction formula:
Figure BDA0002519158340000031
preferably, according to the percentage content of the total mass of the UV cured product, the light-cured monomer is 10-40%, the silicon-containing monomer is 10-30%, and the organic silicon modified UV resin is 2-20%.
The photoinitiator has an absorption wavelength of 360-440 nm, can use a universal Ladtica polymerization initiator, a cation coincidence initiator and the like, and is specifically 1-hydroxycyclohexyl phenyl ketone (photoinitiator 184), 2-methyl-1- (4-methylthiophenyl) -2-morpholine-1-acetone (photoinitiator 907), 2-hydroxy-2-methylphenyl propane-1-ketone (photoinitiator 1173); photoinitiators 819 may also be used: basf reagent, 2,4, 6-trimethylbenzoyl-diphenylphosphine oxide (photoinitiator TPO: basf reagent), 2,4, 6-trimethylbenzoyl-diphenylphosphine oxide (photoinitiator TPO-L: basf reagent).
The invention also discloses a MINI LED fluorescent membrane prepared by the UV cured material, wherein the UV cured material is coated on a PET film by using a coating machine, ultraviolet irradiation is carried out to form the MINI LED fluorescent membrane, the coating thickness of the UV cured material on the PET film is 65-100 micrometers, and the irradiation amount of the ultraviolet is 500-5000 mJ.
Preferably, the PET film is 50-micron-thick PET film or contains SiO2A coated PET film.
Preferably, the UV cured product is coated on the PET film to a thickness of 85 μm, and the irradiation amount of the ultraviolet ray is 1000 to 3000 mJ.
The PET film comprises polyethylene glycol terephthalate, polyethylene, polypropylene, polycarbonate, polymethyl methacrylate, polyimide, oriented polypropylene, biaxially oriented polypropylene, poly 2, 6-dihydroxynaphthalene ester, polyether sulfone, polyester fiber or polystyrene, which are independent, but not limited thereto.
The invention has the beneficial effects that:
(1) Si-O bonds are stronger than C-C bonds and are more permeable to high heat and hot water, the Si-O bond energy being 106Kcal/mol and the C-C bond energy being 83 Kcal/mol. The UV cured product has an Si-O structure, and is stable in heat or moisture, so that the UV cured product has high stability and excellent optical properties under high-temperature and high-humidity conditions;
(2) the photoinitiator used in the present invention contains a UV stabilizer that is stable under UV light, and the stability at high temperature and high humidity is increased. When the conventional UV stabilizer is dissolved, a Si-O monomer is easy to gel, but the UV stabilizer in the photoinitiator used by the invention has double Si-O bonds, so that the gelling phenomenon can be avoided, the limitation on the use amount of the UV stabilizer can be relaxed, and the UV stabilizer can play a good role.
Drawings
FIG. 1 is a schematic view showing a structure of a liquid crystal display device used in an embodiment;
FIG. 2 is a schematic view of the structure of the MINI LED fluorescent film in the example;
in the figure, 1 liquid crystal panel, 2 filters, 3MINI LED fluorescent film, 4 light guide plate, 5 light source, 6 reflector, 7PET film, 8UV cured product.
Detailed Description
The present invention will be described in detail with reference to the following embodiments in order to make the aforementioned objects, features and advantages of the invention more comprehensible. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.
Example 1
In a 500mL three-necked flask, 113036.34 g of hindered amine light stabilizer, 13.66 g of isopropyltriethoxysilane isocyanate, 50 g of N-vinylpyrrolidone, 0.2 g of dibutyltin dilaurate (DBTDL) and 0.2 g of p-hydroxyanisole as a polymerization inhibitor were added, and stirred at 50 ℃ for 90 minutes to obtain a D-1 compound, which was reacted as follows:
Figure BDA0002519158340000051
the raw material composition of the UV cured product is as follows, and the specific dosage of each raw material is shown in Table 1:
(A) fluorescent powder: a combination of KSF and beta-SiAlON;
(B) photo-curing monomer:
(B-1) acrylic fibers having a structure of hexyl,
(B-2) UV light-curable resin (EB1290),
(B-3) a tetraacrylate,
(B-4) epoxy acrylate based bifunctional bisphenol A
(C) Silicon-containing monomer: the C-1 compound has the following specific structural formula:
Figure BDA0002519158340000061
(D) organosilicon modified UV resin: the specific structural formula of the D-1 compound is as follows:
Figure BDA0002519158340000062
(E) photoinitiator (2): photoinitiators 184, 907, 1173, 819; 4, 6-trimethylbenzoyl-diphenylphosphine oxide (TPO) (Bassfer reagent)
Preparation of UV cured product:
the UV cured product was obtained by mixing KSF, beta-SiAlON, a photocurable monomer, a silicon-containing monomer, an organosilicon-modified UV resin, and a photoinitiator at the ratios of the raw materials listed in Table 1, and then stirring and defoaming the mixture at a speed of 1000rpm using a revolution stirring and defoaming machine.
Preparing the MINI LED fluorescent membrane:
the UV cured material is coated on a PET film with the thickness of 50 microns by using a coating machine, ultraviolet irradiation is carried out by using an ultraviolet lamp to form the MINI LED fluorescent membrane, the coating thickness of the UV cured material on the PET film is 75 microns, the ultraviolet irradiation amount is 1000-3000 mJ, and the structure of the MINI LED fluorescent membrane is shown in figure 2.
As the PET film, a film (Excellent Barrier Performance: WVTR 10) having the following inorganic coating properties was used, which was manufactured by i-components of Korea-1~10-4g/m2A/day; (test condition: Mocon Aquatran @38 ℃, 100% RH); high Optical Property: total transmission 90% + ℃ & (storable)) and the PET film is divided into two upper and lower filmsAnd (3) a layer.
Determination of the thickness of the UV cured material in the MINI LED fluorescent film: the specific position of the PET film is measured in micron level, the UV cured material is coated on the PET film, the total thickness is measured in micron level, and the thickness of the UV cured material is obtained by subtracting the thickness of the PET film measured at the beginning from the thickness obtained finally. This example is an average value of the measured thickness at 25 points on a 10 mm-spaced chessboard.
The MINI LED fluorescent film was used for a liquid crystal display device having a configuration as shown in FIG. 1, and was left for 1008 hours in an energized environment of 85 ℃ temperature, 85% relative humidity, and 600 mA. The respective luminance before and after the high-temperature and high-humidity environment was measured, and the light decay after the test was calculated based on the luminance before the test. Specific measurement data are shown in table 2.
Examples 2 to 6 were UV cured products and fluorescent sheets prepared in the same manner as in example 1, except that the compositions of the raw materials, specifically, the raw material compositions are shown in Table 1, and the measurement results are shown in Table 2.
TABLE 1 feed proportioning data for examples 1-6 and comparative examples 1-2
Figure BDA0002519158340000071
TABLE 2 examination data for examples 1-6
Figure BDA0002519158340000081
As can be seen from the data in tables 1 and 2: the UV cured material has good stability and excellent optical characteristics under high-temperature and high-humidity conditions.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims (10)

1. The novel UV cured product is characterized by comprising 10-50% of fluorescent powder, 10-50% of a light-cured monomer, 5-50% of a silicon-containing monomer, 2-30% of organic silicon modified UV resin and 0.01-5% of a photoinitiator by weight percent of the total mass of the UV cured product;
and mixing the fluorescent powder, the light curing monomer, the silicon-containing monomer, the organic silicon modified UV resin and the photoinitiator, and stirring and defoaming by using a revolution stirring defoaming machine at the speed of 1000rpm to obtain the UV cured material.
2. The novel UV cured product according to claim 1, wherein the phosphor is a combination of KSF and β -SiAlON, the KSF is 60 to 80 wt% of the phosphor, and the β -SiAlON is 20 to 40 wt% of the phosphor.
3. The novel UV cured product according to claim 1, wherein the photo-curable monomer is one or more of a polyurethane acrylic oligomer, a 1-functional acrylic photo-curable monomer and a multifunctional acrylic photo-curable monomer.
4. The novel UV cured product according to claim 3, wherein the multifunctional acrylic photocurable monomer is one or more of 4-functional acrylic, 3-functional acrylic and 2-functional acrylic.
5. The novel UV cured product according to claim 4, wherein the multifunctional acrylic photocurable monomer comprises a combination of 2-functional acrylic and any one of 4-functional acrylic and 3-functional acrylic.
6. The novel UV cured product according to claim 1, wherein the organosilicon-modified UV resin is obtained by a chemical reaction between a UV resin monomer and a silane coupling agent.
7. The novel UV cured product according to claim 1, wherein the phosphor is 10-30%, the photo-curable monomer is 10-40%, and the silicone-modified UV resin is 2-20% by weight based on the total weight of the UV cured product.
8. The novel MINI LED fluorescent film prepared from the UV cured product according to any one of claims 1 to 7, wherein the UV cured product is coated on a PET film and irradiated with ultraviolet rays to form the MINI LED fluorescent film, the coating thickness of the UV cured product on the PET film is 65 to 100 micrometers, and the irradiation amount of the ultraviolet rays is 500 to 5000 mJ.
9. The MINI LED fluorescent film according to claim 8, wherein the PET film is 50 μm thick or contains SiO2A coated PET film.
10. The MINI LED fluorescent film according to claim 8, wherein the UV cured material is coated on the PET film to a thickness of 85 μm, and the UV irradiation dose is 1000-3000 mJ.
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CN107237996A (en) * 2017-05-08 2017-10-10 安徽芯瑞达科技股份有限公司 A kind of QLED lamp bars preparation method
CN109695827A (en) * 2018-12-04 2019-04-30 漳州立达信光电子科技有限公司 A kind of light modulation toning LED light

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Publication number Priority date Publication date Assignee Title
US20020115753A1 (en) * 2000-08-03 2002-08-22 Ramanathan Ravichandran Photostable, silylated benzotriazole UV absorbers and compositions stabilized therewith
CN103309162A (en) * 2012-03-06 2013-09-18 第一毛织株式会社 Photocurable composition, and encapsulated apparatus including a barrier layer including the same
CN104804502A (en) * 2014-01-23 2015-07-29 钟志鸿 Colored coating for photocuring
CN103992671A (en) * 2014-05-22 2014-08-20 东华大学 Ultraviolet cured color transfer screen printing fluorescent paint and preparation method thereof
CN107237996A (en) * 2017-05-08 2017-10-10 安徽芯瑞达科技股份有限公司 A kind of QLED lamp bars preparation method
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