CN114656818A - Metal oxide dispersion - Google Patents

Metal oxide dispersion Download PDF

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Publication number
CN114656818A
CN114656818A CN202111454326.8A CN202111454326A CN114656818A CN 114656818 A CN114656818 A CN 114656818A CN 202111454326 A CN202111454326 A CN 202111454326A CN 114656818 A CN114656818 A CN 114656818A
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acrylate
methacrylate
metal oxide
oxide dispersion
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CN114656818B (en
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李慧映
郑佑永
金相现
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KCTech Co Ltd
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KCTech Co Ltd
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    • C09DCOATING 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
    • C09D5/00Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
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    • C09D4/00Coating compositions, e.g. paints, varnishes or lacquers, based on organic non-macromolecular compounds having at least one polymerisable carbon-to-carbon unsaturated bond ; Coating compositions, based on monomers of macromolecular compounds of groups C09D183/00 - C09D183/16
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    • C03CCHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
    • C03C17/00Surface treatment of glass, not in the form of fibres or filaments, by coating
    • C03C17/006Surface treatment of glass, not in the form of fibres or filaments, by coating with materials of composite character
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    • C03CCHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
    • C03C17/00Surface treatment of glass, not in the form of fibres or filaments, by coating
    • C03C17/006Surface treatment of glass, not in the form of fibres or filaments, by coating with materials of composite character
    • C03C17/008Surface treatment of glass, not in the form of fibres or filaments, by coating with materials of composite character comprising a mixture of materials covered by two or more of the groups C03C17/02, C03C17/06, C03C17/22 and C03C17/28
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    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08KUse of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00Use of inorganic substances as compounding ingredients
    • C08K3/18Oxygen-containing compounds, e.g. metal carbonyls
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    • C09D5/00Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
    • C09D5/02Emulsion paints including aerosols
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    • C09D7/00Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
    • C09D7/40Additives
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    • C09D7/00Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
    • C09D7/40Additives
    • C09D7/60Additives non-macromolecular
    • C09D7/61Additives non-macromolecular inorganic
    • C09D7/62Additives non-macromolecular inorganic modified by treatment with other compounds
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    • C09DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
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    • C09D7/60Additives non-macromolecular
    • C09D7/63Additives non-macromolecular organic
    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS OR APPARATUS
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    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS OR APPARATUS
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    • G02B1/04Optical elements characterised by the material of which they are made; Optical coatings for optical elements made of organic materials, e.g. plastics
    • GPHYSICS
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    • G02BOPTICAL ELEMENTS, SYSTEMS OR APPARATUS
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    • C03C2217/00Coatings on glass
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    • C03C2217/73Anti-reflective coatings with specific characteristics
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    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08KUse of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00Use of inorganic substances as compounding ingredients
    • C08K3/18Oxygen-containing compounds, e.g. metal carbonyls
    • C08K3/20Oxides; Hydroxides
    • C08K3/22Oxides; Hydroxides of metals
    • C08K2003/2244Oxides; Hydroxides of metals of zirconium

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Abstract

The present invention relates to a metal oxide dispersion, and more particularly, to a metal oxide dispersion comprising: zirconia nanoparticles; a monomer; and a surface modifier, and the peak intensity (I) of tetragonal system of the zirconia nanoparticlest) And the peak intensity (I) of monoclinic systemm) Is controlled.

Description

Metal oxide dispersion
Technical Field
The present invention relates to a metal oxide dispersion liquid including zirconia particles.
Background
The composition containing a metal oxide is usefully used for manufacturing a thin film for display and the like. The film for display is required to have properties such as optical transmission (optical transmittance), optical haze (optical haze), optical transparency (optical clarity) and refractive index. One example of a thin film for display is a brightness enhancement film.
Such a display film is used for improving the luminance of a display and the like. It can be applied to word processors, desktop displays, televisions, video cameras, automobile and airplane displays, and the like.
When such a film for display is used, it is possible to preferably improve optical characteristics and physical characteristics on a specific panel surface including a refractive index. For example, when a brightness enhancement film or the like is provided, by improving the brightness, it is possible to illuminate the display with less power, thereby reducing power consumption, reducing the degree of heat generation, extending the product life, and thus making it possible to use the electronic product more efficiently.
Materials for such display films have yet to be developed, and in order to produce such materials more efficiently, it is necessary to develop a metal oxide dispersion liquid that can include a metal oxide while maintaining a high refractive index, and that has high dispersibility of the metal oxide and low viscosity in the composition.
Disclosure of Invention
Technical problem to be solved
The present invention has been made to solve the above problems, and an object of the present invention is to provide a metal oxide dispersion liquid having a high refractive index and a low viscosity by adjusting the ratio of the crystal phase of zirconia nanopowder.
However, the problems to be solved by the present invention are not limited to the above-mentioned problems, and other problems not mentioned can be clearly understood by those skilled in the art from the following description.
Means for solving the problems
A metal oxide dispersion according to an embodiment of the present invention includes: zirconia nanoparticles; a monomer; and a surface modifier, wherein the peak intensity (It) of the tetragonal system and the peak intensity (Im) of the monoclinic system of the zirconia nanoparticles satisfy the following formulas:
[ formula 1]
3<It/Im<4。
According to an embodiment of the present invention, the zirconia nanoparticles may include: a monoclinic crystal structure of 30% to 40%; and 60% to 70% of the crystal structure of the tetragonal system.
According to an embodiment of the present invention, the zirconia nanoparticles may account for 40 wt% to 70 wt% of the metal oxide dispersion.
According to an embodiment of the present invention, the monomer is 1 to 50 wt% of the metal oxide dispersion, and may include a monomer selected from the group consisting of methyl acrylate, lauryl acrylate, ethoxydiglycol acrylate, methoxytriethylene glycol acrylate, phenoxyethyl acrylate, tetrahydrofurfuryl acrylate, isobornyl acrylate, 2-hydroxyethyl acrylate, 2-hydroxypropyl acrylate, 2-hydroxy-3-phenoxy acrylate, neopentyl glycol diacrylate, 1, 6-hexanediol diacrylate, trimethylolpropane triacrylate, pentaerythritol tetraacrylate, dipentaerythritol hexaacrylate, trimethylolpropane acrylate benzoate, trimethylolpropane benzoate, methyl methacrylate, methyl acrylate, and mixtures thereof, 2-ethylhexyl methacrylate, n-stearyl methacrylate, cyclohexyl methacrylate, tetrahydrofurfuryl methacrylate, phenoxyethyl methacrylate, methoxypolyethylene methacrylate, 2-hydroxyethyl methacrylate, 2-hydroxybutyl methacrylate, heptadecafluorodecyl methacrylate, trifluoromethyl methacrylate, trifluoroethyl acrylate, hexafluoropropyl methacrylate, 1, 6-hexanediol dimethacrylate, trimethylolpropane trimethacrylate, glycerol dimethacrylate hexamethylene diisocyanate, ethylene glycol dimethacrylate, urethane acrylate, epoxy acrylate, melamine acrylate, benzyl methacrylate, phenyl acrylate, diphenyl acrylate, biphenyl acrylate, diphenyl acrylate, benzyl methacrylate, and mixtures thereof, 2-biphenylacrylate, ethyl 2- ([1,1' -biphenyl ] -2-aryloxy) acrylate, phenoxybenzyl acrylate, 3-phenoxybenzyl-3- (1-naphthyl) acrylate, ethyl 2E) -3-hydroxy-2- (3-phenoxybenzyl) acrylate, phenyl methacrylate, biphenyl methacrylate, 2-nitrophenylacrylate, 4-nitrophenylacrylate, 2-nitrophenylmethacrylate, 4-nitrophenylmethacrylate, 2-nitrobenzyl methacrylate, 4-nitrobenzyl methacrylate, 2-chlorophenyl acrylate, 4-chlorophenyl acrylate, 2-chlorophenyl methacrylate, 2-benzyl methacrylate, and 2-benzyl methacrylate, 4-chlorophenyl methacrylate, ethyl o-phenylphenol acrylate, phenylphenol, biphenyl methacrylate, o-phenylphenol ethoxy acrylate, 1- (biphenyl-2-ylmethyl) -4-phenylpiperazine, 1- (biphenyl-2-ylmethyl) -4- (2-methoxyphenyl) piperazine, 1- (biphenyl-2-ylmethyl) -4- (2-ethoxyphenyl) piperazine, 1- (biphenyl-2-ylmethyl) -4- (2-isopropoxyphenyl) piperazine, 1- (biphenyl-2-ylmethyl) -4- (3-methoxyphenyl) piperazine, 1- (biphenyl-2-ylmethyl) -4- (4-methoxyphenyl) piperazine, and bisphenol diacrylate At least one selected from the group.
According to an embodiment of the present invention, the surface modifier includes a silane coupling agent, and the silane coupling agent may include at least one selected from the group consisting of an acrylate group, a (meth) acrylate group, an epoxy group, an alkoxy group, a vinyl group, a phenyl group, a methacryloxy group, an amino group, a chlorosilicane group, a chloropropyl group, and a mercapto group.
According to an embodiment of the present invention, the surface modifier may include a compound selected from the group consisting of (3-glycidoxypropyl) trimethoxysilane, (3-glycidoxypropyl) triethoxysilane, (3-glycidoxypropyl) methyldimethoxysilane, (3-glycidoxypropyl) dimethylethoxysilane, 3- (methacryloyloxy) propyltrimethoxysilane, 3, 4-epoxybutyltrimethoxysilane, 3, 4-epoxybutyltriethoxysilane, 2- (3, 4-epoxycyclohexyl) ethyltrimethoxysilane, 2- (3, 4-epoxycyclohexyl) ethyltriethoxysilane, aminopropyltriethoxysilane, vinyltriethoxysilane, vinyltri-t-butoxysilane, vinyltri-isobutoxysilane, and mixtures thereof, At least one selected from the group consisting of vinyltriisopropoxysilane, vinyltriphenoxysilane, aminopropyltrimethoxysilane, N-phenyl-3-aminopropyltrimethoxysilane, phenylsilane, phenyltrimethoxysilane, phenyltriethoxysilane, phenylchlorosilane, phenyltrichlorosilane, gamma-glycidoxypropyltriphenoxysilane, gamma-glycidoxypropylmethyldiphenoxysilane, dichlorodiphenylsilane, N-phenyl-gamma-aminopropyltrimethoxysilane, dimethoxymethylphenylsilane, diphenyldimethoxysilane, diethoxydiphenylsilane, methylphenyldiethoxysilane, methylphenyldichlorosilane and phenoxytrimethylsilane.
According to an embodiment of the present invention, the surface modifier may account for 10 to 20 parts by weight with respect to the total weight of the zirconia nanoparticles in the metal oxide dispersion.
According to an embodiment of the present invention, the metal oxide dispersion liquid further includes a dispersant, and the dispersant may include at least one selected from the group consisting of a polyether acid compound, a polyether amine compound, a polyether acid/amine mixture, an ester compound including a phosphoric acid group, and a polyether compound including a phosphoric acid group.
According to an embodiment of the present invention, the refractive index of the metal oxide dispersion may be 1.60 or more.
According to an embodiment of the present invention, the viscosity of the metal oxide dispersion may be 400CP or less.
According to an embodiment of the present invention, the metal oxide dispersion may be solvent-free.
An optical element for a flexible display according to an embodiment of the present invention is manufactured using the metal oxide dispersion liquid according to the present invention.
ADVANTAGEOUS EFFECTS OF INVENTION
The present invention can provide a zirconia monomer dispersion having a low viscosity and a high refractive index by applying zirconia nanopowder having a controlled crystal phase ratio. Further, the dispersion is excellent in dispersibility of zirconia particles, provides relatively low viscosity, has excellent fluidity and plasticity, and it can be suitably used as a display sol dispersion capable of improving efficiency of a device (i.e., a display device).
Detailed Description
Hereinafter, examples of the present invention will be described in detail. In describing the present invention, when it is judged that a detailed description of related well-known functions or configurations unnecessarily obscure the gist of the present invention, a detailed description thereof will be omitted. The terms used in the present specification are used to accurately express preferred embodiments of the present invention, and may be varied according to the intention of a user or the convention of the art in which the present invention is applied. Thus, the definitions of the terms should be defined based on the entire contents of the specification.
In the entire specification, when a certain portion is described as "including" a certain constituent element, it does not mean that other constituent elements are excluded, and other constituent elements may be included.
The polishing slurry composition of the present invention will be specifically described below with reference to examples. However, the present invention is not limited to the above-described embodiments.
The present invention relates to a metal oxide dispersion, which may include, according to an embodiment of the present invention: zirconia nanoparticles; a monomer; and a surface modifier.
According to an embodiment of the present invention, the zirconia nanoparticles can reduce the viscosity of the metal oxide dispersion by adjusting the crystal phase ratio of the powder and exhibit a high refractive index. That is, the ratio of the crystal phases may be adjusted in the XRD spectrum in accordance with the peak intensity ratio of the tetragonal system and the monoclinic system, the ratio of the tetragonal system and the monoclinic system crystal phases, or both.
As an example of the present invention, the peak intensity (I) of the tetragonal system of the zirconia nanoparticlest) And the peak intensity (I) of monoclinic systemm) The following formula can be satisfied:
[ formula 1]
3<It/Im<4。
As an example of the present invention, in the zirconia nanoparticles, the monoclinic crystal structure may be 30% to 40% or 34% to 40%; and the crystal structure of the tetragonal system may be 60% to 70% or 60% to 66%, and, in combination with the peak intensity ratio according to formula 1, may facilitate reduction of the viscosity of the dispersion while having a high refractive index.
As an example of the present invention, the zirconia nanoparticles may account for 40 wt% to 70 wt% of the metal oxide dispersion. When included within the above range, the refractive index and brightness of the dispersion become low due to the low content of the zirconia, thereby preventing the problem of difficulty in providing a high refractive index cured film, and the dispersion interval between the zirconia particles is very short due to the excessive addition of the zirconia particles, which increases the viscosity of the dispersion, and suppresses the dispersibility due to the occurrence of agglomeration between the zirconia particles, and can reduce the deterioration of the optical performance.
As an example of the present invention, the size of the zirconia particles may be 1nm or more; more than 10 nm; or 50nm to 100 nm.
According to an embodiment of the present invention, the monomer may include at least one selected from the group consisting of C1-C22 alkyl acrylate monomers, C1-C22 alkoxy acrylate monomers, C6-C24 aryl acrylate monomers, C1-C22 alkyl (meth) acrylate monomers, C1-C22 alkoxy (meth) acrylate monomers, C6-C24 aryl (meth) acrylate monomers, alkylene glycol di (meth) acrylate monomers, alkylene glycol diacrylate monomers, alkylene glycol alkyl ether (meth) acrylate monomers, alkylene glycol alkyl ether acrylate monomers, and derivatives in which methacrylate and/or acrylate substituents are introduced.
Further, the monomer is further substituted with at least one or more of a hydroxyl group, an aliphatic ring and an aromatic ring (6 to 30 carbon atoms) in the molecule, the "alkylene" has 1 to 10 carbon atoms and is included as 1 to 20 (n) carbon atoms; the "alkyl ether" may include an alkyl group having 1 to 20 carbon atoms. The monomer may include 1 to 6 functional acrylates, e.g., difunctional, trifunctional, etc.
For example, the monomer may be methyl acrylate, lauryl acrylate, ethoxydiglycol acrylate, methoxytriethylene glycol acrylate, phenoxyethyl acrylate, tetrahydrofurfuryl acrylate, isobornyl acrylate, 2-hydroxyethyl acrylate, 2-hydroxypropyl acrylate, 2-hydroxy-3-phenoxy acrylate, neopentyl glycol diacrylate, 1, 6-hexanediol diacrylate, trimethylolpropane triacrylate, pentaerythritol tetraacrylate, dipentaerythritol hexaacrylate, trimethylolpropane acrylate benzoate, trimethylolpropane benzoate, methyl methacrylate, 2-ethylhexyl methacrylate, n-stearyl methacrylate, cyclohexyl methacrylate, n-stearyl methacrylate, and mixtures thereof, Tetrahydrofurfuryl methacrylate, phenoxyethyl methacrylate, methoxypolyethylene methacrylate, 2-hydroxyethyl methacrylate, 2-hydroxybutyl methacrylate, heptadecafluorodecyl methacrylate, trifluoromethyl methacrylate, trifluoroethyl acrylate, hexafluoropropyl methacrylate, 1, 6-hexanediol dimethacrylate, trimethylolpropane trimethacrylate, glycerol dimethacrylate hexamethylene diisocyanate, ethylene glycol dimethacrylate, urethane acrylate, epoxy acrylate, melamine acrylate, benzyl methacrylate, phenyl acrylate, diphenyl acrylate, biphenyl acrylate, 2-biphenyl acrylate, ethyl 2- ([1,1' -biphenyl ] -2-aryloxy) acrylate, methyl methacrylate, ethyl acrylate, ethyl methacrylate, ethyl acrylate, benzyl methacrylate, phenyl acrylate, diphenyl acrylate, 2-biphenyl acrylate, 2-hydroxy ethyl methacrylate, n-butyl methacrylate, p-butyl acrylate, p-2-butyl acrylate, p-2-butyl acrylate, p, Phenoxybenzyl acrylate, 3-phenoxybenzyl-3- (1-naphthyl) acrylate, ethyl (2E) -3-hydroxy-2- (3-phenoxybenzyl) acrylate, phenyl methacrylate, biphenyl methacrylate, 2-nitrophenylacrylate, 4-nitrophenylacrylate, 2-nitrophenylmethacrylate, 4-nitrophenylmethacrylate, 2-nitrobenzylmethacrylate, 4-nitrobenzyl methacrylate, 2-chlorophenyl acrylate, 4-chlorophenyl acrylate, 2-chlorophenyl methacrylate, 4-chlorophenyl methacrylate, ethyl o-phenylphenol acrylate, phenylphenol, biphenyl methacrylate, diphenylacrylate, phenylphenol, diphenylacrylate, and processes for producing, O-phenylphenol ethoxy acrylate, 1- (biphenyl-2-ylmethyl) -4-phenylpiperazine, 1- (biphenyl-2-ylmethyl) -4- (2-methoxyphenyl) piperazine, 1- (biphenyl-2-ylmethyl) -4- (2-ethoxyphenyl) piperazine, 1- (biphenyl-2-ylmethyl) -4- (2-isopropoxyphenyl) piperazine, 1- (biphenyl-2-ylmethyl) -4- (3-methoxyphenyl) piperazine, 1- (biphenyl-2-ylmethyl) -4- (4-methoxyphenyl) piperazine, bisphenol diacrylate, and the like.
As an example of the present invention, the monomer may account for 1 to 50 wt% of the metal oxide dispersion; or 10 to 50 wt%, and, when included within the above range, can provide a coating layer having a high refractive index and flexibility by improving the dispersibility of the metal oxide and improving curing in a subsequent process.
According to an embodiment of the present invention, when the surface modifier is included within the above range, the metal oxide sol dispersion can be used to effectively disperse the zirconia seeds in the sol dispersion while maintaining a high refractive index, a low viscosity level suitable for forming a film, and an effective light transmittance. Thus, even when the metal oxide dispersion liquid of the present invention is filled with zirconia particles at a high concentration, stable dispersibility is ensured, so that a metal oxide sol maintaining high transparency can be prepared.
As an example of the present invention, the surface modifier includes a silane coupling agent, and the silane coupling agent may include at least one selected from the group consisting of an acrylate group, a (meth) acrylate group, an epoxy group, an alkoxy group, a vinyl group, a phenyl group, a methacryloxy group, an amino group, a chlorosilane group, a chloropropyl group, and a mercapto group. The acrylate monomers and methacrylate monomers may be substituted with phenyl.
For example, the surface modifier may be (3-glycidoxypropyl) trimethoxysilane, (3-glycidoxypropyl) triethoxysilane, (3-glycidoxypropyl) methyldimethoxysilane, (3-glycidoxypropyl) dimethylethoxysilane, 3- (methacryloyloxy) propyltrimethoxysilane, 3, 4-epoxybutyltrimethoxysilane, 3, 4-epoxybutyltriethoxysilane, 2- (3, 4-epoxycyclohexyl) ethyltrimethoxysilane, 2- (3, 4-epoxycyclohexyl) ethyltriethoxysilane, aminopropyltriethoxysilane, vinyltriethoxysilane, vinyltri-t-butoxysilane, vinyltriisobutoxysilane, vinyltriisopropoxysilane, glycidoxypropyl, and the like, Vinyltriphenoxysilane, aminopropyltrimethoxysilane, N-phenyl-3-aminopropyltrimethoxysilane, phenylsilane, phenyltrimethoxysilane, phenyltriethoxysilane, phenylchlorosilane, phenyltrichlorosilane, gamma-glycidoxypropyltriphenoxysilane, gamma-glycidoxypropylmethyldiphenoxysilane, dichlorodiphenylsilane, N-phenyl-gamma-aminopropyltrimethoxysilane, dimethoxymethylphenylsilane, diphenyldimethoxysilane, diethoxydiphenylsilane, methylphenyldiethoxysilane, methylphenyldichlorosilane, and phenoxytrimethylsilane.
As an example of the present invention, the surface modifier accounts for 10 to 20 parts by weight with respect to the total weight of the zirconia nanoparticles in the metal oxide dispersion, and when it is included in the above range, the rate of progress of the surface treatment reaction of the zirconia particles can be appropriately maintained to increase the dispersibility of the zirconia particles in the dispersion composition, and the surface treatment agent that is excessively used adheres to the surfaces of the zirconia particles, and deterioration of the dispersibility can be reduced by inducing the agglomeration among the zirconia particles.
According to an embodiment of the present invention, the metal oxide dispersion liquid further includes a dispersant, and the dispersant may include at least one selected from the group consisting of a polyether acid compound, a polyether amine compound, a polyether acid/amine mixture, an ester compound including a phosphoric acid group, and a polyether compound including a phosphoric acid group.
As an example of the present invention, the dispersant may account for 1 to 20 wt% of the metal oxide dispersion. When the content of the dispersant is less than 1% by weight, compatibility with a resin composition made of an organic compound to be used in a subsequent process is reduced; when the content of the dispersant exceeds 20% by weight, the dispersant is excessively bonded to the surface of the zirconia particles, possibly resulting in a decrease in refractive index.
According to an embodiment of the present invention, the metal oxide dispersion may further include an organic solvent for easy dispersion, which may be 30 to 50 wt%. The solvent can be completely (almost) removed for subsequent processing to form a solventless sol dispersion.
As an example of the present invention, when the organic solvent content is less than 30 wt% of the metal oxide dispersion, it exceeds the minimum range of the action of the dispersion medium, thereby reducing the dispersibility and suppressing the viscosity and optical properties, and increases the solvent removal time by more than 50 wt%, thereby possibly reducing the refractive index and brightness of an optical film made of the metal oxide dispersion, reducing the transmittance of a cured film, and increasing the haze.
According to an embodiment of the present invention, the refractive index of the metal oxide dispersion is 1.60 or more; or 1.670 or more, which has excellent compatibility with components or compositions to be applied together in subsequent processes, and can form a coating layer having characteristics of high luminance efficiency, high transmittance, and high refractive index.
According to an embodiment of the present invention, the viscosity of the metal oxide dispersion is 400CP or less; 100 to 400; or 100 to 300, the metal oxide dispersion is solvent-free, and may be a sol dispersion. When the viscosity is high, the viscosity becomes too high, so that it is difficult to prepare a liquid with an organic material, and the dispersibility of zirconia particles in a dispersion may be reduced, and it is difficult to form a uniform thin film layer when manufacturing a film, resulting in deterioration of optical characteristics. The viscosity can be measured using the DV2T LV spindle (manufactured by Brookfield). Further, the viscosity can be measured at a temperature of 25 ℃ and a shear rate of 1.0 (1/s).
An optical element for a flexible display according to an embodiment of the present invention is manufactured using the metal oxide dispersion liquid according to the present invention.
As an example of the present invention, the optical element may be an optical element for display, for example, a diffusion film, an optical film, a polarizing film, a prism sheet, an AR sheet, a display film, or the like for an electronic device.
As an example of the present invention, the optical element may include a substrate; and a coating (film or the like) formed on at least a part of the substrate from the metal oxide dispersion liquid according to the present invention or a composition comprising the metal oxide dispersion liquid. When the optical element is manufactured, the metal oxide dispersion or the composition including the metal oxide dispersion may form a coating layer in a state of a trace amount of solvent or near zero solvent or no (free) solvent.
As an example of the present invention, the substrate is appropriately selected according to the use of the optical film, and may be a transparent substrate. The transparent substrate can be used without limitation as long as it is a film having transparency. For example, the substrate may be polyester (polyester) such as Polyethylene terephthalate (PET), Polyethylene (EVA) such as Ethylene Vinyl Acetate (EVA), Cyclic Olefin Polymer (COP), Cyclic Olefin Copolymer (COC), cyclic olefin copolymer (PAC), Polyacrylate (PAC), Polycarbonate (PC), Polyethylene (PE), Polyethylene), polymethyl methacrylate (PMMA), polyether ether ketone (PEEK), Polyethylene Naphthalate (PEN), polyether imide (PEI, polyimide), polyimide (PI, polyimide), triacetyl cellulose (TAC), Methyl Methacrylate (MMA), or a film of inorganic resin.
Hereinafter, the present invention will be described in more detail by way of examples, which, however, are for illustrative purposes only and are not intended to limit the scope of the present invention.
Example 1
Hydroxyl-zirconia nanoparticles were synthesized by a hydrothermal method, and in this case, the synthesized zirconia particles were 65.4% tetragonal system and 34.6% monoclinic system, and the peak ratio of the monoclinic system to the monoclinic system was 3.70(XRD spectrum).
In a 100mL container for a paint shaker flask, 28.9g of Tetrahydrofuran (hereinafter abbreviated as "THF") and 2.1g of silane having a methacryl group (3- (methacryloxy) propyltrimethoxysilane, particle solid content 10-20%) were placed and mixed at room temperature for 10 minutes using a stirring bar (sterrer bar). Next, 38g of the synthesized zirconia powder was added to the solution, and mixed at room temperature for 30 minutes using a stirring rod to form a mixed solution. Thereafter, 200g of 0.05mm beads were added to the mixture and dispersed for 3 hours using a paint shaker to obtain a 40 wt% zirconium oxide-THF solvent dispersion. Thereafter, the zirconia-THF solvent dispersion was mixed with an acrylate-based monomer (bibenzylacrylate, 40 wt%), and the solvent was removed under reduced pressure to obtain a zirconia-monomer (40 wt%) dispersion. The viscosity and refractive index of the prepared monomer dispersion are shown in table 1.
Example 2
The hydroxyl-zirconia nanoparticles were synthesized by a hydrothermal method, and at this time, the synthesized zirconia particles were in a tetragonal system of 64.2% and in a monoclinic system of 35.8%, and the peak ratio of the tetragonal system to the monoclinic system was 3.48. A monomer dispersion was prepared in the same manner as in example 1. The viscosity and refractive index of the prepared monomer dispersion are shown in table 1.
Example 3
Hydroxyl-zirconia nanoparticles were synthesized by a hydrothermal method, and the synthesized zirconia particles were 65.8% tetragonal system and 34.2% monoclinic system, and the peak ratio of the monoclinic system to the monoclinic system was 3.36. A monomer dispersion was prepared in the same manner as in example 1. The viscosity and refractive index of the prepared monomer dispersion are shown in table 1.
Comparative example 1
Hydroxyl-zirconia nanoparticles were synthesized by a hydrothermal method, and the synthesized zirconia particles were 72.6% tetragonal system and 27.4% monoclinic system, and the peak ratio of the monoclinic system to the monoclinic system was 5.90. A monomer dispersion was prepared in the same manner as in example 1. The viscosity and refractive index of the prepared monomer dispersion are shown in table 1.
Comparative example 2
Hydroxyl-zirconia nanoparticles were synthesized by a hydrothermal method, and the synthesized zirconia particles were 68.7% tetragonal system and 31.3% monoclinic system, and the peak ratio of the monoclinic system to the monoclinic system was 5.65. A monomer dispersion was prepared in the same manner as in example 1. The viscosity and refractive index of the prepared monomer dispersion are shown in table 1.
Comparative example 3
Hydroxyl-zirconia nanoparticles were synthesized by a hydrothermal method, and the synthesized zirconia particles were in the tetragonal system 64.1% and the monoclinic system 35.9%, and the peak ratio of the monoclinic system to the monoclinic system was 4.01. A monomer dispersion was prepared in the same manner as in example 1. The viscosity and refractive index of the prepared monomer dispersion are shown in table 1.
Comparative example 4
Hydroxyl-zirconia nanoparticles were synthesized by a hydrothermal method, and the synthesized zirconia particles were 56.1% tetragonal system and 43.9% monoclinic system, and the peak ratio of the monoclinic system to the monoclinic system was 2.923. A monomer dispersion was prepared in the same manner as in example 1. The viscosity and refractive index of the prepared monomer dispersion are shown in table 1.
Comparative example 5
Hydroxyl-zirconia nanoparticles were synthesized by a hydrothermal method, and at this time, the synthesized zirconia particles were 49.0% tetragonal system and 51.0% monoclinic system, and the peak ratio of the monoclinic system to the monoclinic system was 1.62. A monomer dispersion was prepared in the same manner as in example 1. The viscosity and refractive index of the prepared monomer dispersion are shown in table 1.
Comparative example 6
The hydroxyl-zirconia nanoparticles were synthesized by a hydrothermal method, and at this time, the synthesized zirconia particles were 25.4% tetragonal system and 74.6% monoclinic system, and the peak ratio of the monoclinic system to the monoclinic system was 0.61. A monomer dispersion was prepared in the same manner as in example 1. The viscosity and refractive index of the prepared monomer dispersion are shown in table 1.
< method of measuring refractive index >
The measurement was automatically started when a sample of the coating liquid prepared according to this example was dropped on the prism at room temperature (25 ℃) and the set temperature was reached by pressing the start key. The resulting value is the refractive index of the composition and is shown in the following table.
The measuring equipment comprises: atago (ATAGO)/Japan
The model name is: RX-5000 Alpha (Alpha)
< method of measuring viscosity >
Viscosity was measured using a DV2T LV spindle device.
[ Table 1]
Figure BDA0003386171530000101
As is clear from table 1, the ratio of the peak intensities of the tetragonal system and the monoclinic system is more than 3 and less than 4, and the viscosity can be reduced while having a high refractive index by adjusting the ratio of the tetragonal system to the ratio of the mixed crystal phases of zirconia such as the monoclinic system (60 to 66% in the tetragonal system and 34 to 40% in the monoclinic system).
In summary, the embodiments have been described with respect to a limited number of embodiments, and those skilled in the art will be able to make numerous modifications and variations to the above description. For example, the techniques described may be performed in a different order from the methods described, or the components described may be combined or combined in a different form from the methods described, or may be replaced or substituted with other components or equivalents, thereby obtaining the same effects. Accordingly, other embodiments, examples, and equivalents of the claims are all within the scope of the claims.

Claims (12)

1. A metal oxide dispersion liquid characterized by comprising,
the method comprises the following steps:
zirconia nanoparticles;
a monomer; and
a surface-modifying agent, which is a mixture of a surfactant,
peak intensity (I) of tetragonal system of the zirconia nanoparticlest) And the peak intensity (I) of monoclinic systemm) The following formula is satisfied:
[ formula 1]
3<It/Im<4。
2. The metal oxide dispersion liquid according to claim 1,
the zirconia nanoparticles comprising:
a monoclinic crystal structure of 30% to 40%; and
the crystal structure of the tetragonal system is 60 to 70%.
3. The metal oxide dispersion liquid according to claim 1,
the zirconia nanoparticles comprise 40 to 70 weight percent of the metal oxide dispersion.
4. The metal oxide dispersion liquid according to claim 1,
the monomer accounts for 1 to 50 wt% of the metal oxide dispersion,
the monomer is selected from the group consisting of methyl acrylate, lauryl acrylate, ethoxydiglycol acrylate, methoxytriethylene glycol acrylate, phenoxyethyl acrylate, tetrahydrofurfuryl acrylate, isobornyl acrylate, 2-hydroxyethyl acrylate, 2-hydroxypropyl acrylate, 2-hydroxy-3-phenoxy acrylate, neopentyl glycol diacrylate, 1, 6-hexanediol diacrylate, trimethylolpropane triacrylate, pentaerythritol tetraacrylate, dipentaerythritol hexaacrylate, trimethylolpropane benzoate, methyl methacrylate, 2-ethylhexyl methacrylate, n-stearyl methacrylate, cyclohexyl methacrylate, tetrahydrofurfuryl methacrylate, lauryl methacrylate, stearyl methacrylate, and mixtures thereof, Phenoxyethyl methacrylate, methoxy polyethylene methacrylate, 2-hydroxyethyl methacrylate, 2-hydroxybutyl methacrylate, heptadecafluorodecyl methacrylate, trifluoromethyl methacrylate, trifluoroethyl acrylate, hexafluoropropyl methacrylate, 1, 6-hexanediol dimethacrylate, trimethylolpropane trimethacrylate, glycerol dimethacrylate hexamethylene diisocyanate, ethylene glycol dimethacrylate, urethane acrylate, epoxy acrylate, melamine acrylate, benzyl methacrylate, phenyl acrylate, diphenyl acrylate, biphenyl acrylate, 2-biphenyl acrylate, ethyl 2- ([1,1' -biphenyl ] -2-aryloxy) acrylate, phenoxybenzyl methacrylate, and mixtures thereof, 3-phenoxybenzyl-3- (1-naphthyl) acrylate, ethyl (2E) -3-hydroxy-2- (3-phenoxybenzyl) acrylate, phenyl methacrylate, biphenyl methacrylate, 2-nitrophenylacrylate, 4-nitrophenylacrylate, 2-nitrophenylmethacrylate, 4-nitrophenylmethacrylate, 2-nitrobenzyl methacrylate, 4-nitrobenzyl methacrylate, 2-chlorophenyl acrylate, 4-chlorophenyl acrylate, 2-chlorophenyl methacrylate, 4-chlorophenyl methacrylate, ethyl o-phenylphenol acrylate, phenylphenol, biphenyl methacrylate, o-phenylphenol ethoxy acrylate, phenyl phenol, phenyl methacrylate, phenyl, 1- (biphenyl-2-ylmethyl) -4-phenylpiperazine, 1- (biphenyl-2-ylmethyl) -4- (2-methoxyphenyl) piperazine, 1- (biphenyl-2-ylmethyl) -4- (2-ethoxyphenyl) piperazine, 1- (biphenyl-2-ylmethyl) -4- (2-isopropoxyphenyl) piperazine, 1- (biphenyl-2-ylmethyl) -4- (3-methoxyphenyl) piperazine, 1- (biphenyl-2-ylmethyl) -4- (4-methoxyphenyl) piperazine, and bisphenol diacrylate.
5. The metal oxide dispersion liquid according to claim 1,
the surface modifying agent comprises a silane coupling agent,
the silane coupling agent includes at least one selected from the group consisting of an acrylate group, a (meth) acrylate group, an epoxy group, an alkoxy group, a vinyl group, a phenyl group, a methacryloxy group, an amino group, a chlorosilyl group, a chloropropyl group, and a mercapto group.
6. The metal oxide dispersion liquid according to claim 1,
the surface modifier is selected from the group consisting of (3-glycidoxypropyl) trimethoxysilane, (3-glycidoxypropyl) triethoxysilane, (3-glycidoxypropyl) methyldimethoxysilane, (3-glycidoxypropyl) dimethylethoxysilane, 3- (methacryloyloxy) propyltrimethoxysilane, 3, 4-epoxybutyltrimethoxysilane, 3, 4-epoxybutyltriethoxysilane, 2- (3, 4-epoxycyclohexyl) ethyltrimethoxysilane, 2- (3, 4-epoxycyclohexyl) ethyltriethoxysilane, aminopropyltriethoxysilane, vinyltriethoxysilane, vinyltri-t-butoxysilane, vinyltriisobutoxysilane, vinyltriisopropoxysilane, vinyltriisobutoxysilane, vinyltriisopropoxysilane, vinyltrimethoxysilane, vinyltriethoxysilane, vinyltriisobutoxysilane, vinyltrimethoxysilane, vinyltriethoxysilane, vinyltrimethoxysilane, vinyltriethoxysilane, vinyltrimethoxysilane, vinyltriethoxysilane, vinyltrimethoxysilane, vinyltriethoxysilane, vinyltrimethoxysilane, vinyltriethoxysilane, vinyltrimethoxysilane, vinyltriethoxysilane, vinyltrimethoxysilane, vinyltriethoxysilane, vinyltrimethoxysilane, vinyltriethoxysilane, vinyltrimethoxysilane, At least one selected from the group consisting of vinyltriphenoxysilane, aminopropyltrimethoxysilane, N-phenyl-3-aminopropyltrimethoxysilane, phenylsilane, phenyltrimethoxysilane, phenyltriethoxysilane, phenylchlorosilane, phenyltrichlorosilane, gamma-glycidoxypropyltriphenoxysilane, gamma-glycidoxypropylmethyldiphenoxysilane, dichlorodiphenylsilane, N-phenyl-gamma-aminopropyltrimethoxysilane, dimethoxymethylphenylsilane, diphenyldimethoxysilane, diethoxydiphenylsilane, methylphenyldiethoxysilane, methylphenyldichlorosilane and phenoxytrimethylsilane.
7. The metal oxide dispersion liquid according to claim 1,
the surface modifier comprises 10 to 20 parts by weight based on the total weight of the zirconia nanoparticles in the metal oxide dispersion.
8. The metal oxide dispersion liquid according to claim 1,
the metal oxide dispersion liquid further includes a dispersant,
the dispersant includes at least one selected from the group consisting of a polyether acid compound, a polyether amine compound, a polyether acid/amine mixture, an ester compound including a phosphoric acid group, and a polyether compound including a phosphoric acid group.
9. The metal oxide dispersion liquid according to claim 1,
the refractive index of the metal oxide dispersion is 1.60 or more.
10. The metal oxide dispersion liquid according to claim 1,
the viscosity of the metal oxide dispersion is 400CP or less.
11. The metal oxide dispersion liquid according to claim 1,
the metal oxide dispersion is solvent-free.
12. An optical element for a flexible display, characterized in that,
the metal oxide dispersion according to claim 1.
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