WO2022210051A1 - コロイド状シリカ粒子とシアヌル酸亜鉛粒子とを含む有機溶媒分散液及びその製造方法 - Google Patents
コロイド状シリカ粒子とシアヌル酸亜鉛粒子とを含む有機溶媒分散液及びその製造方法 Download PDFInfo
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- WO2022210051A1 WO2022210051A1 PCT/JP2022/012839 JP2022012839W WO2022210051A1 WO 2022210051 A1 WO2022210051 A1 WO 2022210051A1 JP 2022012839 W JP2022012839 W JP 2022012839W WO 2022210051 A1 WO2022210051 A1 WO 2022210051A1
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- WIPO (PCT)
- Prior art keywords
- organic solvent
- particles
- group
- dispersion
- zinc cyanurate
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- ZNOCGWVLWPVKAO-UHFFFAOYSA-N trimethoxy(phenyl)silane Chemical compound CO[Si](OC)(OC)C1=CC=CC=C1 ZNOCGWVLWPVKAO-UHFFFAOYSA-N 0.000 description 1
- HQYALQRYBUJWDH-UHFFFAOYSA-N trimethoxy(propyl)silane Chemical compound CCC[Si](OC)(OC)OC HQYALQRYBUJWDH-UHFFFAOYSA-N 0.000 description 1
- DQZNLOXENNXVAD-UHFFFAOYSA-N trimethoxy-[2-(7-oxabicyclo[4.1.0]heptan-4-yl)ethyl]silane Chemical compound C1C(CC[Si](OC)(OC)OC)CCC2OC21 DQZNLOXENNXVAD-UHFFFAOYSA-N 0.000 description 1
- BPSIOYPQMFLKFR-UHFFFAOYSA-N trimethoxy-[3-(oxiran-2-ylmethoxy)propyl]silane Chemical compound CO[Si](OC)(OC)CCCOCC1CO1 BPSIOYPQMFLKFR-UHFFFAOYSA-N 0.000 description 1
- PZJJKWKADRNWSW-UHFFFAOYSA-N trimethoxysilicon Chemical compound CO[Si](OC)OC PZJJKWKADRNWSW-UHFFFAOYSA-N 0.000 description 1
- 239000005051 trimethylchlorosilane Substances 0.000 description 1
- 238000001291 vacuum drying Methods 0.000 description 1
- 239000005050 vinyl trichlorosilane Substances 0.000 description 1
- 238000010947 wet-dispersion method Methods 0.000 description 1
Classifications
-
- 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
- C09D17/00—Pigment pastes, e.g. for mixing in paints
- C09D17/004—Pigment pastes, e.g. for mixing in paints containing an inorganic pigment
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J13/00—Colloid chemistry, e.g. the production of colloidal materials or their solutions, not otherwise provided for; Making microcapsules or microballoons
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B33/00—Silicon; Compounds thereof
- C01B33/113—Silicon oxides; Hydrates thereof
- C01B33/12—Silica; Hydrates thereof, e.g. lepidoic silicic acid
- C01B33/14—Colloidal silica, e.g. dispersions, gels, sols
- C01B33/145—Preparation of hydroorganosols, organosols or dispersions in an organic medium
-
- 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
- C09D17/00—Pigment pastes, e.g. for mixing in paints
-
- 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
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/08—Anti-corrosive paints
- C09D5/082—Anti-corrosive paints characterised by the anti-corrosive pigment
-
- 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
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/60—Additives non-macromolecular
- C09D7/61—Additives non-macromolecular inorganic
-
- 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
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/60—Additives non-macromolecular
- C09D7/61—Additives non-macromolecular inorganic
- C09D7/62—Additives non-macromolecular inorganic modified by treatment with other compounds
-
- 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
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/60—Additives non-macromolecular
- C09D7/63—Additives non-macromolecular organic
-
- 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
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/66—Additives characterised by particle size
- C09D7/67—Particle size smaller than 100 nm
-
- 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
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/80—Processes for incorporating ingredients
Definitions
- the present invention relates to an organic solvent dispersion in which dispersoid particles containing colloidal silica particles and zinc cyanurate particles are dispersed in an organic solvent, and a method for producing the same.
- Zinc cyanurate is known as a corrosion inhibitor for metal surfaces of iron-based metals, and various methods for producing the zinc cyanurate have also been disclosed.
- Patent Document 1 as a method for producing lead cyanurate and zinc, which are known as anti-corrosion protective agents for metal surfaces, PbO or ZnO and cyanuric acid are mixed at 100 ° C. to 180 ° C. to form a paste.
- a manufacturing method is disclosed in which the paste is subjected to a shearing action at 50°C to 250°C.
- Patent Document 2 zinc salts and/or lead salts of organic compounds such as barbituric acid and cyanuric acid are used as anti-corrosion coating agents for metal surfaces based on zinc salts and/or lead salts of organic compounds.
- a corrosion inhibiting coating is disclosed.
- the average particle diameter D50 measured by a laser diffraction method is 80 nm to 900 nm
- the specific surface area is 20 m 2 /g to 100 m 2 /g
- the length ratio of the major axis/minor axis Wet dispersion of a mixed slurry of needle-like or plate-like basic zinc cyanurate particles characterized by having an axial ratio of 5 to 25, zinc oxide or basic zinc carbonate, cyanuric acid and water.
- a method of making by performing is disclosed.
- Patent Document 4 discloses a method for producing a basic zinc cyanurate powder by heat-treating a mixed powder consisting of zinc oxide, cyanuric acid and water under closed or open conditions, and the basic zinc cyanurate powder is disclosed. is disclosed.
- Patent Document 5 discloses an aqueous dispersion containing colloidal silica particles and zinc cyanurate particles as dispersoid particles, a method for producing the same, and a composition for coating with a resin emulsion.
- Patent Document 6 discloses a coating composition in which a dispersion liquid containing zinc cyanurate particles and inorganic oxide particles as dispersoid particles is used as a coating additive and blended with a resin emulsion.
- Zinc cyanurate has been conventionally known to be capable of imparting a high corrosion resistance to metal surfaces. When it is attempted to disperse it in an organic solvent, it becomes a non-uniform slurry, which is difficult to handle. In addition, by making a dispersion containing colloidal silica particles and zinc cyanurate particles, the stability of the coating composition tends to be improved. had not been considered. By using a dispersion containing zinc cyanurate particles and inorganic oxide particles as dispersoid particles as a coating additive and blending it with a resin emulsion to form a coating composition, a coating film with high adhesion can be formed. However, there has been a demand for further improvement in handling properties of organic solvent-based coating compositions.
- the present invention has been made in view of the above circumstances, and an organic solvent dispersion in which dispersoid particles containing colloidal silica particles and zinc cyanurate particles are dispersed in an organic solvent in a manner having high dispersion stability; It aims at providing the manufacturing method.
- the present inventors have made intensive studies to solve the above problems. It has been found that by performing a dispersing step of dispersing in a solvent, the particle size distribution of the dispersoid particles is narrowed, and an organic solvent dispersion having high dispersion stability can be obtained. The inventors have also found that by bonding an alkoxy group to , it exhibits high dispersion stability in an organic solvent, and have completed the present invention.
- a first aspect of the present invention is an organic solvent dispersion in which dispersoid particles containing colloidal silica particles and zinc cyanurate particles are dispersed in an organic solvent, It relates to an organic solvent dispersion in which an alkoxy group represented by general formula (1) is bonded to at least part of the surface of the dispersoid particles.
- the alkoxy groups are bonded to the colloidal silica particles contained in the dispersoid particles at a ratio of 0.01 to 10.0 groups per unit surface area of the colloidal silica particles. It relates to the organic solvent dispersion according to the first aspect.
- the organic solvent dispersion according to the first aspect or the second aspect, wherein the water content in the dispersion in which the dispersoid particles are dispersed in the organic solvent is 5% by mass or less.
- the organic solvent is at least one or two or more selected from the group consisting of alcohols, ketones, ethers, esters, hydrocarbons and nitrogen-containing organic compounds. It relates to the organic solvent dispersion according to any one of the aspects.
- the organic dispersoid particles containing colloidal silica particles and zinc cyanurate particles satisfy the following (a) and (b): It relates to solvent dispersions.
- colloidal silica particles and cyanurate include a dispersing step of mixing silica particles, zinc cyanurate particles and an organic solvent, and dispersing dispersoid particles containing silica particles and zinc cyanurate particles in the organic solvent.
- the present invention relates to a method for producing an organic solvent dispersion in which dispersoid particles containing zinc acid particles are dispersed in an organic solvent.
- the preparation of the organic solvent dispersion according to the sixth aspect wherein the mixture of silica particles, zinc cyanurate particles, and an organic solvent is a mixture of silica sol and zinc cyanurate particles using an organic solvent as a dispersion medium.
- the present invention relates to the method for producing an organic solvent dispersion according to the seventh aspect, wherein the water content of the silica sol is 5% by mass or less.
- the dispersion medium of the silica sol is at least one or two or more selected from the group consisting of alcohols, ketones, ethers, esters, hydrocarbons and nitrogen-containing organic compounds.
- a seventh aspect Or it relates to the method for producing the organic solvent dispersion according to the eighth aspect.
- the silica sol is an alcohol-dispersed silica sol or an organic solvent-dispersed silica sol in which the dispersion medium of the alcohol-dispersed silica sol is replaced with an organic solvent, and the organic solvent is ketones, ethers, esters, hydrocarbons and nitrogen-containing organic compounds.
- the silica sol contains at least one or two or more alcohols selected from the group consisting of methanol, ethanol, propanol, butanol, isopropyl alcohol, ethylene glycol monomethyl ether, propylene glycol monomethyl ether and propylene glycol monoethyl ether.
- an alkoxy group represented by the general formula (1) is bonded to at least part of the surface of the dispersoid particles containing the colloidal silica particles and the zinc cyanurate particles.
- the alkoxy groups are bonded to the colloidal silica particles contained in the dispersoid particles at a ratio of 0.01 to 10.0 per unit surface area of the colloidal silica particles. It relates to a method for producing an organic solvent dispersion according to the twelfth aspect.
- (a) has an average particle size of 50 nm to 100 nm as determined by a laser diffraction method;
- D10, D50, and D90 are the particle diameters when the cumulative frequency is 10%, 50%, and 90% in the particle size distribution measurement by the laser diffraction method, respectively, and D50/D10 is 1.10 or more. .60 and D90/D50 is 1.10 or more and less than 1.60.
- the organic solvent according to the ninth aspect wherein the dispersion medium of the silica sol is at least one or two or more selected from the group consisting of methanol, ethanol, propanol, butanol, isopropyl alcohol, methyl ethyl ketone, and methyl isobutyl ketone. It relates to a method for producing a dispersion. As a sixteenth aspect, the present invention relates to the method for producing an organic solvent dispersion according to any one of the sixth aspect to the fifteenth aspect, wherein the silica particles have an average primary particle size of 5 nm to 500 nm.
- the zinc cyanurate particles have an average long axis length of 50 nm to 1000 nm and an average short axis length of 10 nm to 300 nm, as measured by transmission electron microscopy.
- the present invention relates to a method for producing an organic solvent dispersion.
- any one of the sixth aspect to the eighteenth aspect, wherein in the dispersing step, the total solid content of the colloidal silica particles and the zinc cyanurate particles is 0.1% by mass to 50% by mass. to a method for producing an organic solvent dispersion.
- the present invention relates to the method for producing an organic solvent dispersion according to any one of the sixth to nineteenth aspects, wherein the dispersing step is performed with a submerged disperser.
- the submerged disperser is a high-speed rotary shearing stirrer, a colloid mill, a high-pressure injection disperser, an ultrasonic disperser, a vessel-driven mill, or a medium stirring mill.
- the present invention relates to a method for producing an organic solvent dispersion.
- the medium agitating mill is of a circulation type or a batch type.
- dispersoid particles containing colloidal silica particles and zinc cyanurate particles can be produced in an organic solvent in a state of high dispersion stability without the occurrence of sediment even when left standing for a long period of time.
- a dispersed organic solvent dispersion can be obtained.
- the organic solvent dispersion obtained by such a production method has the effect of being excellent in handleability when producing a composition such as a paint.
- the zinc cyanurate particles are uniformly dispersed in the composition and the coating film, it is expected that the original function of zinc cyanurate, such as anti-corrosion properties, will be fully exhibited.
- the organic solvent dispersion of the present invention maintains high dispersion stability even in an organic solvent, and no sediments even when left standing for a long period of time, because alkoxy groups are bonded to at least part of the surface of the dispersoid particles. There is an effect that it does not occur.
- the present invention comprises a dispersing step of mixing silica particles, zinc cyanurate particles and an organic solvent, and dispersing dispersoid particles containing silica particles and zinc cyanurate particles in the organic solvent.
- the present invention relates to a method for producing an organic solvent dispersion in which dispersoid particles containing zinc particles are dispersed in an organic solvent.
- the present invention also provides an organic solvent dispersion in which an alkoxy group represented by the general formula (1) is bonded to at least part of the surface of dispersoid particles containing colloidal silica particles and zinc cyanurate particles. Regarding.
- Silica particles can be used regardless of their form, such as silica powder and silica sol using an organic solvent as a dispersion medium.
- the silica powder includes SiO 2 powder, and known methods, liquid phase methods (hydrolysis method, sol-gel method, hydrothermal method, coprecipitation method, freeze-drying method, etc.), gas phase method (melting method, spray drying method, gas phase reaction method (combustion hydrolysis, etc.), etc.).
- colloidal silica particles can be produced by a known method (eg, ion exchange method, deflocculation method, hydrolysis method, reaction method, etc.), dried and used.
- silica powder examples include those having a specific surface area of 1 m 2 /g to 800 m 2 /g, such as 10 m 2 /g to 700 m 2 /g, 30 m 2 /g to 500 m 2 /g, 40 m 2 /g to Mention may be made of powders that are 300 m 2 /g.
- a commercial product can be used as the silica powder, and examples thereof include, but are not limited to, the following.
- AEROSIL registered trademark
- Cab-O-SIL registered trademark
- Sylysia registered trademark
- Fuji Silysia Chemical Co., Ltd. Reoloseal
- EXCELICA registered trademark
- HDK registered trademark
- a silica sol using an organic solvent as a dispersion medium can be used in the form of an organic solvent-dispersed sol in which colloidal silica particles are dispersed in an organic solvent.
- Silica sol is obtained by replacing a water-dispersed silica sol produced by a known method (e.g., ion exchange method, peptization method, hydrolysis method, reaction method (oxidation method), etc.) with an organic solvent by evaporation using a rotary evaporator or the like.
- a known method e.g., ion exchange method, peptization method, hydrolysis method, reaction method (oxidation method), etc.
- an organic solvent by evaporation using a rotary evaporator or the like.
- it can also be used as an organic solvent dispersion sol by dispersing silica powder in an organic solvent.
- a silica sol having a water content of 5% by mass or less, 3% by mass or less, or 2% by mass or less can be used.
- the SiO 2 concentration of the silica sol can be in the range of 0.1 mass % to 50 mass %, 1.0 mass % to 40 mass %, or 5.0 mass % to 40 mass %.
- At least one or two or more organic solvents selected from the group consisting of alcohols, ketones, ethers, esters, hydrocarbons and nitrogen-containing organic compounds can be used.
- these organic solvents include alcohols such as methanol, ethanol, propanol, butanol, and isopropyl alcohol, ketones such as methyl ethyl ketone, methyl isobutyl ketone, and ⁇ -butyl lactone, ethylene glycol monomethyl ether, propylene glycol monomethyl ether, and propylene glycol.
- Ethers such as monoethyl ether, esters such as ethyl acetate and butyl acetate, hydrocarbons such as toluene, xylene, n-pentane, n-hexane and cyclohexane, N,N-dimethylformamide and N-methylpyrrolidone.
- examples include nitrogen-containing organic compounds. These may be used singly or in combination of two or more.
- the organic solvent used in the dispersion step may be the same as the organic solvent species of the silica sol dispersion medium, or may be different.
- the silica sol is an alcohol-dispersed silica sol or an organic solvent-dispersed silica sol obtained by replacing the dispersion medium of the alcohol-dispersed silica sol with an organic solvent, wherein the organic solvent is ketones, ethers, esters, hydrocarbons and nitrogen-containing organic compounds.
- the alcohol-dispersed silica sol is an alcohol-dispersed sol using methanol, ethanol, propanol, butanol, isopropyl alcohol, ethylene glycol monomethyl ether, propylene glycol monomethyl ether, propylene glycol monoethyl ether, or the like as a dispersion medium.
- the organic solvent-dispersed silica sol obtained by replacing the dispersion medium of the alcohol-dispersed silica sol with an organic solvent includes methyl ethyl ketone, methyl isobutyl ketone, ethylene glycol monomethyl ether, propylene glycol monomethyl ether, propylene glycol monoethyl ether, ⁇ -butyl lactone, ethyl acetate, and acetic acid. It is an organic solvent dispersion sol using butyl, toluene, xylene, n-pentane, n-hexane, cyclohexane, N,N-dimethylformamide, N-methylpyrrolidone, or the like as a dispersion medium.
- Dispersoid particles containing the alcohol-dispersed silica sol, or the organic solvent-dispersed silica sol obtained by replacing the dispersion medium of the alcohol-dispersed silica sol with an organic solvent, and zinc cyanurate particles are coated on at least a part of the surface with the general formula (1):
- the indicated alkoxy group is attached.
- R 1 is a methyl group, ethyl group, n-propyl group, isopropyl group, n-butyl group, isobutyl group, t-butyl group, 2-methoxyethyl group, 1-methoxy-2-propyl group, 1 -Ethoxy-2-propyl group or phenyl group.
- the alkoxy groups are produced by reversible reaction of silanol groups (Si—OH groups) on the surface of colloidal silica particles with alcohols.
- Si—OH groups silanol groups
- R 1 is a methyl group
- the silanol group on the colloidal silica particle surface reacts reversibly with methanol.
- R 1 is particularly preferred that R 1 is a methyl group, ethyl group, n-propyl group, isopropyl group or 1-methoxy-2-propyl group.
- dispersoid particles containing colloidal silica particles and zinc cyanurate particles exhibit good dispersion stability in organic solvents, It is possible to suppress the formation of sediments even after long-term storage.
- the amount of the alkoxy group bound to the colloidal silica particle surface is 0.05 to 10.0 per unit surface area (nm 2 ) of the colloidal silica particle. Preferably, it is 0.05 to 7.0, or 0.1 to 7.0.
- the amount of alkoxy groups bound to the colloidal silica particle surface can be determined by gas chromatography measurement or the like.
- the surface area of the colloidal silica particles can be measured by the nitrogen gas adsorption method (BET method).
- the average primary particle size of colloidal silica particles contained in silica sol can be measured by a nitrogen gas adsorption method (BET method).
- the surface of the colloidal silica particles contained in the silica sol may be modified with an organosilicon compound or a hydrolyzate thereof.
- the surface modification treatment with the organic silicon compound renders the colloidal surface hydrophobic, making it possible to achieve excellent dispersibility in water-insoluble organic solvents.
- the particles have a structure in which, for example, an organosilicon compound is bonded to the hydroxy groups on the surface of colloidal silica particles.
- the organosilicon compound to be used a known organosilicon compound or silane compound known as a silane coupling agent can be used, and the type thereof is appropriately selected depending on the application, the type of solvent, and the like.
- the silane coupling agent include vinyltrichlorosilane, vinyltrimethoxysilane, vinyltriethoxysilane, 2-(3,4-epoxycyclohexyl)ethyltrimethoxysilane, 3-glycidoxypropyltrimethoxysilane, 3-glycidoxypropylmethylditriethoxysilane, 3-glycidoxypropyltriethoxysilane, p-vinylphenyltrimethoxysilane, 3-methacryloyloxypropylmethyldimethoxysilane, 3-methacryloyloxypropyltrimethoxysilane, 3-methacryloyl Oxypropylmethyldiethoxysilane, 3-methacryloyloxy
- silanes include methyltrichlorosilane, dimethyldichlorosilane, trimethylchlorosilane, phenyltrichlorosilane, methyltrimethoxysilane, dimethyldimethoxysilane, phenyltrimethoxysilane, methyltriethoxysilane, dimethyldiethoxysilane, and phenyltrichlorosilane.
- ethoxysilane n-propyltrimethoxysilane, n-propyltriethoxysilane, hexyltrimethoxysilane, hexyltriethoxysilane, decyltrimethoxysilane, trifluoropropyltrimethoxysilane, hexamethyldisilazane and the like.
- Silica sol using an organic solvent as a dispersion medium can be a commercially available product, and examples thereof include, but are not limited to, the following.
- Nissan Chemical Co., Ltd. make a brand name organo silica sol can be used.
- the zinc cyanurate particles have an acicular or plate-like elongated particle shape, and the zinc cyanurate particles used have a (zinc oxide)/(cyanuric acid) conversion molar ratio of 1.0 to 5.0. be able to.
- the zinc cyanurate particles can be produced by two methods, namely, a method in which the raw material is dispersed in water and subjected to a liquid phase reaction in a slurry state, and a method in which the raw material is subjected to a solid phase reaction in a powder state.
- a mixed powder of zinc oxide having a mesh size of 1,000 ⁇ m and a sieve residue of less than 1% by mass, cyanuric acid, and water, wherein the molar ratio of zinc oxide to cyanuric acid is 2 to 3 and the water content of the mixed powder is 9% to 18% by mass, and heat-treating the mixed powder at 30°C to 300°C under closed or open conditions to produce the zinc cyanurate particles. can be done.
- the average lengths of the major and minor axes of the primary particles of zinc cyanurate can be measured by transmission electron microscopy.
- the average length of the major axis of the primary particles can be 50 nm to 1000 nm, or 100 nm to 800 nm, or 200 nm to 700 nm, and the average length of the minor axis is 10 nm to 300 nm, or 30 nm to 200 nm, or 30 nm to 30 nm. It can be 100 nm.
- Those having a length ratio of the major axis to the minor axis (major axis/minor axis) of 2 to 25, or 2 to 10, or 2 to 5 can be used.
- zinc cyanurate particles are obtained by dispersing the particles or a dispersion containing the particles in pure water, and using a laser diffraction particle size distribution analyzer (for example, Shimadzu Corporation, trade name SALD-7500nano).
- a laser diffraction particle size distribution analyzer for example, Shimadzu Corporation, trade name SALD-7500nano.
- the average particle size of the zinc cyanurate particles in the aqueous dispersion can be measured.
- the average particle size measured by laser diffraction can be 100 nm to 5000 nm, 500 nm to 3000 nm, or 800 nm to 3000 nm.
- zinc cyanurate particles having a specific surface area of, for example, 10 m 2 /g to 100 m 2 /g can be used.
- zinc cyanurate particles can be used, and examples thereof include, but are not limited to, the following.
- Nissan Chemical Co., Ltd. make and a brand name star fine can be used.
- organic solvents used when mixing silica particles and zinc cyanurate particles include alcohols, ketones, ethers, esters, hydrocarbons and nitrogen-containing organic compounds.
- these solvents include alcohols such as methanol, ethanol, propanol, butanol and isopropyl alcohol; ketones such as methyl ethyl ketone, methyl isobutyl ketone and ⁇ -butyl lactone; ethers such as ethyl ether; esters such as ethyl acetate and butyl acetate; Nitrogenous organic compounds and the like can be mentioned. These can be used singly or in combination of two or more.
- the mass ratio of the silica particles to the zinc cyanurate particles is, for example, a ratio of 1:0.01 to 100, or a ratio of 1:0.1 to 10, Alternatively, the ratio can be from 1:1 to 10.
- the concentration of the total solid content of silica particles and zinc cyanurate particles is, for example, 0.1% to 50% by mass, or 0.1% to 30% by mass, or It can be from 0.1% by mass to 20% by mass, or from 0.1% by mass to 10% by mass.
- silica sol the mass of colloidal silica particles contained in the silica sol can be used as the mass of the silica particles.
- a liquid disperser can be used in the dispersing step of dispersing the dispersoid particles in the organic solvent.
- the submerged disperser can perform an operation for creating a state in which a substance is dispersed in the form of particles in a liquid medium and an operation for reducing the primary particle size of the substance in the liquid medium.
- devices can be classified according to the external force that disperses aggregates. mills, medium agitation mills and the like.
- a high-speed rotary shear type stirrer can be used in the dispersion step by appropriately setting the stirring blades and rotation speed.
- Vessel-driven mills include rotary mills, vibratory mills, and planetary mills.
- Media agitation mills include circulating or batch units.
- Examples of medium agitating mills include sand grinder (manufactured by Imex Co., Ltd.), Apex Mill (manufactured by Hiroshima Metal & Machinery Co., Ltd. (former Kotobuki Kogyo Co., Ltd.)), Attritor (manufactured by Nippon Coke Industry Co., Ltd.), A ball mill such as a pearl mill (manufactured by Ashizawa Fine Tech Co., Ltd.), a bead mill, and a sand mill can be used.
- the material and size of the dispersing medium, the number of rotations of the apparatus for stirring the dispersing medium, the reaction time, and the like may be appropriately adjusted according to the type and viscosity of the organic solvent.
- the dispersion step does not include a solvent replacement step. Therefore, for example, a method of producing an organic solvent dispersion by substituting an organic solvent for a water solvent dispersion in which dispersoid particles containing colloidal silica particles and zinc cyanurate particles are dispersed in a water solvent is not included. . Further, the solvent replacement step does not include, for example, a step of replacing the organic solvent of the organic solvent dispersion with another organic solvent.
- Dispersoid particles containing colloidal silica particles and zinc cyanurate particles obtained by performing a dispersing step of dispersing dispersoid particles in an organic solvent are obtained by dispersing the particles or a dispersion containing the particles in various solvents.
- a laser diffraction particle size distribution analyzer eg, Shimadzu Corporation, trade name SALD-7500nano
- the average particle size and particle size distribution in an organic solvent can be measured.
- the average particle size by laser diffraction method can be 50 nm to 1700 nm, or 50 nm to 1200 nm, or 50 nm to 800 nm. Preferably, it is 50 nm to 100 nm.
- each particle size is measured with D10, D50, and D90 as the particle size when the cumulative frequency becomes 10%, 50%, and 90%, respectively.
- D50/D10 and D90/D50 are calculated from the measurement results.
- D50/D10 can be 1.10 or more and less than 1.60, or 1.10 or more and less than 1.50, or 1.10 or more and less than 1.46.
- D90/D50 can be 1.10 or more and less than 1.60, or 1.10 or more and less than 1.55, or 1.10 or more and less than 1.50.
- the dispersoid particles satisfy the above average particle size range and satisfy the above D50/D10 and D90/D50, thereby obtaining an organic solvent dispersion with good dispersion stability and long-term storage. It becomes possible.
- Dispersoid particles containing colloidal silica particles and zinc cyanurate particles which are obtained by performing a dispersing step of dispersing dispersoid particles in an organic solvent, have a simple distribution curve from the viewpoint of the dispersion stability of the organic solvent dispersion. It is preferred to have one peak. In addition, if there is one or more peaks in the particle size region larger than the most frequent particle size (mode size), the dispersion stability of the organic solvent dispersion may decrease, or the dispersoid particles in the coating film may be dispersed. Localization is a concern.
- the amount of water contained in the dispersion liquid in which the dispersoid particles are dispersed in the organic solvent can be 5% by mass or less. Preferably, it can be 3% by mass or less, or 1% by mass or less. By adjusting the content to such a range, the organic solvent dispersion has good dispersion stability and can be stored for a long period of time.
- a surfactant or the like can be added in the dispersion step for the purpose of improving dispersibility in organic solvents.
- surfactants include anionic surfactants, cationic surfactants, amphoteric surfactants, and nonionic surfactants.
- anionic surfactants include carboxylates, sulfonates, sulfates, phosphates, and the like.
- cationic surfactants include amine salt types and quaternary ammonium salts.
- Amphoteric surfactants include carboxylate type, amine acid type, betaine type and the like.
- nonionic surfactants include ester-type, ether-type, and ester/ether-type surfactants.
- a silica sol and zinc cyanurate particles were prepared by the following procedure.
- the following silica sol was prepared.
- ⁇ Methanol-dispersed silica sol (Nissan Chemical Co., Ltd., average primary particle size 12 nm by BET method, solid content 30.5% by mass)
- MEK Methyl ethyl ketone
- PGME Propylene glycol monomethyl ether
- PGME Propylene glycol monomethyl ether
- Zinc cyanurate particles manufactured by Nissan Chemical Industries, Ltd., trade name Starfine (registered trademark) (average particle size measured by laser diffraction method 1.7 ⁇ m, average major axis of primary particles measured by transmission electron microscope observation: 400 nm) to 600 nm, minor axis: 50 nm to 70 nm, major axis/minor axis ratio 5.7 to 12, specific surface area 15 m 2 /g, (zinc oxide)/(cyanuric acid) conversion molar ratio 2.5) (3)
- the pH of the organic solvent dispersion was measured by the following method. After mixing the organic solvent dispersion and pure water in the same mass, the pH was measured at 20° C.
- the average particle size of the dispersoid particles in the organic solvent dispersion was measured by a laser diffraction method. After diluting a dispersion containing colloidal silica particles and zinc cyanurate particles with pure water, measurement was performed using SALD-7500nano manufactured by Shimadzu Corporation. Here, [1.70-0.2i] was used as a substitute value for the refractive index.
- the Ostwald viscosity of the organic solvent dispersion was measured according to the following method. It was measured in a constant temperature bath at 25° C. using an Ostwald viscometer (manufactured by Shibata Scientific Co., Ltd.).
- the dispersion stability (settling property) of the organic solvent dispersion was evaluated according to the following method. 105 g of the resulting organic solvent dispersion was placed in a 100 mL polypropylene container and allowed to stand at room temperature for 3 months. If there was no sediment, it was evaluated as "good dispersion stability", and if there was sediment, it was evaluated as "poor dispersion stability”. (7) The amount of water contained in the solvent of the organic solvent dispersion was measured according to the following method. The water content was measured by Karl Fischer titration using a Karl Fischer moisture meter (manufactured by Kyoto Electronics Industry Co., Ltd.). The amount of water contained in the solvent of the aqueous dispersion was defined as 100%.
- the bonding amount of alkoxy groups bonded to the silica particle surface was measured according to the following method.
- (8.1) Place 3 mL of organic solvent-dispersed silica sol in a 30 mL centrifuge tube, and add 20 mL of toluene. (8.2) After centrifuging (5000 rpm ⁇ 30 minutes), the supernatant is removed. (8.3) Add 4 mL of acetone to re-dissolve the gel, add 10 mL of toluene and 4 mL of hexane, and perform centrifugation (5000 rpm ⁇ 30 minutes). (8.4) Repeat (8.2) to (8.3).
- the obtained powder was pulverized in a mortar and dried at 150°C for 2 hours.
- 0.2 g of the powder obtained above was mixed and dissolved in 10 mL of a 0.05 N sodium hydroxide aqueous solution, and the amount of alcohol was measured by gas chromatography to measure the amount of alkoxy groups bonded to the surface.
- the obtained amount of alkoxy groups was calculated as the number per unit surface area (nm 2 ) of the silica particles using the surface area value of the silica particles obtained by the nitrogen adsorption method.
- Example 1 34.3 g of methanol-dispersed silica sol and 60.2 g of methanol were placed in a 250 mL polypropylene container, 10.5 g of zinc cyanurate particles were added while stirring with a stirrer equipped with a turbine blade, and a mixed slurry ( SiO concentration: 10.5 g) was added. 0% by weight and zinc cyanurate concentration of 10.0% by weight) were prepared.
- 105 g of the mixed slurry and 180 g of glass beads with a diameter of 0.5 mm to 0.7 mm are placed in a 250 mL polypropylene container, the container is placed on a ball mill rotating table set at a rotation speed of 150 rpm, wet pulverized for 30 hours, and dispersed in methanol. I got the liquid.
- the resulting methanol dispersion had a solid content (silica + zinc cyanurate) concentration of 20% by mass, a pH of 6.6, an average particle size of 68 nm as measured by laser diffraction, and a viscosity of 1.0 mPa ⁇ s. Dispersion stability was evaluated. Table 1 shows the results.
- Example 2 Put 34.3 g of MEK-dispersed silica sol and 60.2 g of MEK in a 250-mL polypropylene container, add 10.5 g of zinc cyanurate particles while stirring with a stirrer equipped with a turbine blade, and obtain a mixed slurry ( SiO concentration: 10.0). % by weight, zinc cyanurate concentration 10.0% by weight) were prepared. Next, 105 g of the mixed slurry and 180 g of glass beads with a diameter of 0.5 to 0.7 mm are placed in a 250 mL polypropylene container, the container is placed on a ball mill rotating table set at a rotation speed of 150 rpm, and wet pulverized for 30 hours to disperse MEK.
- the obtained MEK dispersion had a solid content (silica + zinc cyanurate) concentration of 20% by mass, a pH of 6.6, an average particle size of 70 nm and a viscosity of 1.3 mPa ⁇ s as measured by a laser diffraction method. Table 1 shows the evaluation results of the dispersion stability.
- Example 3 Put 34.4 g of PGME-dispersed silica sol and 60.1 g of PGME into a 250 mL polypropylene container, add 10.5 g of zinc cyanurate particles while stirring with a stirrer equipped with a turbine blade, and prepare a mixed slurry ( SiO concentration: 10.0). % by weight, zinc cyanurate concentration 10.0% by weight) were prepared. Next, 105 g of the mixed slurry and 180 g of glass beads with a diameter of 0.5 to 0.7 mm are placed in a 250 mL polypropylene container, placed on a ball mill rotating table set at a rotation speed of 150 rpm, and wet-ground for 30 hours to disperse PGME.
- the obtained PGME dispersion had a solid content (silica + zinc cyanurate) concentration of 20% by mass, a pH of 6.2, an average particle size of 144 nm and a viscosity of 5.8 mPa ⁇ s as measured by a laser diffraction method.
- Table 1 shows the evaluation results of the dispersion stability.
- [Comparative Example 2] Put 125 g of water-dispersed silica sol and 325 g of pure water in a 500 mL polypropylene container, add 50 g of zinc cyanurate particles while stirring with a stirrer equipped with a turbine blade, and prepare a mixed slurry ( SiO concentration: 10.0% by mass, cyanuric A zinc acid concentration of 10.0% by mass) was prepared. Next, 150 g of the mixed slurry and 180 g of glass beads with a diameter of 0.7 to 1.0 mm are placed in a 250 mL polypropylene container, the container is placed on a ball mill rotating table set at a rotation speed of 165 rpm, wet pulverized for 30 hours, and dispersed in water.
- the resulting aqueous dispersion had a solid content (silica + zinc cyanurate) concentration of 20% by mass, a pH of 8.1, an average particle size of 141 nm and a viscosity of 8.3 mPa ⁇ s as measured by a laser diffraction method. Dispersion stability was evaluated. Table 1 shows the results.
- the resulting methanol dispersion had a solid content (zinc cyanurate) concentration of 10% by mass, a pH of 7.0, and an average particle size of 1047 nm as measured by a laser diffraction method. Dispersion stability was evaluated. Table 1 shows the results.
- the obtained MEK dispersion had a solid content (zinc cyanurate) concentration of 10% by mass, a pH of 6.9, and an average particle size of 1810 nm as measured by a laser diffraction method. Dispersion stability was evaluated. Table 1 shows the results.
- the resulting PGME dispersion had a solid content (zinc cyanurate) concentration of 10% by mass, a pH of 6.6, and an average particle size of 177 nm as measured by a laser diffraction method. Dispersion stability was evaluated. Table 1 shows the results.
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Abstract
Description
例えば特許文献1には、金属表面の腐食防止保護剤として知られているシアヌル酸鉛及び亜鉛の製法として、PbO又はZnOとシアヌル酸を100℃乃至180℃でペースト状に混合し、得られたペーストに50℃乃至250℃でせん断作用を加える製造方法が開示されている。
また特許文献2には、有機化合物の亜鉛塩及び/又は鉛塩を基礎とする金属表面の腐食防止被覆剤として、バルビツール酸、シアヌル酸等の有機化合物の亜鉛塩及び/又は鉛塩を用いた腐食防止被覆材が開示されている。
さらに特許文献3には、レーザー回折法により測定した平均粒子径D50が80nm乃至900nmであり、比表面積が20m2/g乃至100m2/gであり、長軸/短軸の長さの比(軸比)が5乃至25であることを特徴とする針状又は板状の塩基性シアヌル酸亜鉛粒子を、酸化亜鉛又は塩基性炭酸亜鉛とシアヌル酸と水とを配合した混合スラリーの湿式分散を行うことにより製造する方法が開示されている。
また特許文献4には、酸化亜鉛、シアヌル酸及び水からなる混合粉末を密閉又は開放下で加熱処理することによる塩基性シアヌル酸亜鉛粉末を得る製造方法が開示され、該塩基性シアヌル酸亜鉛粉末を配合した防錆顔料組成物が開示されている。
また特許文献5には、コロイド状シリカ粒子とシアヌル酸亜鉛粒子とを分散質粒子とした水分散液とその製造方法、さらに樹脂エマルジョンとの被膜用組成物が開示されている。
また特許文献6には、シアヌル酸亜鉛粒子と無機酸化物粒子とを分散質粒子とした分散液を塗料添加剤として用い、樹脂エマルジョンと配合した塗料組成物が開示されている。
シアヌル酸亜鉛粒子と無機酸化物粒子とを分散質粒子とした分散液を塗料添加剤として用い、樹脂エマルジョンと配合して塗料組成物にすることで密着性の高いコート膜を形成できるようになるが、有機溶剤系の塗料組成物については更なるハンドリング性の向上が求められていた。
該分散質粒子の表面の少なくとも一部に、一般式(1)で示されるアルコキシ基が結合している有機溶媒分散液に関する。
第2観点として、前記アルコキシ基が前記分散質粒子に含まれるコロイド状シリカ粒子に結合しており、該コロイド状シリカ粒子の単位表面積当たり、0.01個乃至10.0個の割合で結合している第1観点に記載の有機溶媒分散液に関する。
第3観点として、前記分散質粒子が有機溶媒に分散した分散液に含まれる水分量が5質量%以下である第1観点又は第2観点に記載の有機溶媒分散液に関する。
第4観点として、前記有機溶媒がアルコール類、ケトン類、エーテル類、エステル類、炭化水素類及び含窒素有機化合物類からなる群から選ばれる少なくとも一種又は二種以上である第1観点乃至第3観点のいずれか一に記載の有機溶媒分散液に関する。
第5観点として、前記コロイド状シリカ粒子とシアヌル酸亜鉛粒子とを含む分散質粒子が、以下の(a)及び(b)を満たす、第1観点乃至第4観点のいずれか一に記載の有機溶媒分散液に関する。
(a)レーザー回折法による平均粒子径が50nm乃至100nmであり、
(b)レーザー回折法による粒度分布測定において、頻度の積算が10%、50%、90%になる際の粒子径をそれぞれD10、D50、D90とした場合、D50/D10が1.10以上1.60未満、且つ、D90/D50が1.10以上1.60未満である。
第6観点として、シリカ粒子とシアヌル酸亜鉛粒子と有機溶媒とを混合し、シリカ粒子とシアヌル酸亜鉛粒子とを含む分散質粒子を有機溶媒に分散させる分散工程を含む、コロイド状シリカ粒子とシアヌル酸亜鉛粒子とを含む分散質粒子が有機溶媒に分散された有機溶媒分散液の製造方法に関する。
第7観点として、シリカ粒子とシアヌル酸亜鉛粒子と有機溶媒との混合が、有機溶媒を分散媒としたシリカゾルとシアヌル酸亜鉛粒子との混合である第6観点に記載の有機溶媒分散液の製造方法に関する。
第8観点として、前記シリカゾルの水分含有量が5質量%以下である第7観点に記載の有機溶媒分散液の製造方法に関する。
第9観点として、前記シリカゾルの分散媒が、アルコール類、ケトン類、エーテル類、エステル類、炭化水素類及び含窒素有機化合物類からなる群から選ばれる少なくとも一種又は二種以上である第7観点又は第8観点に記載の有機溶媒分散液の製造方法に関する。
第10観点として、前記シリカゾルが、アルコール分散シリカゾル、又は該アルコール分散シリカゾルの分散媒を有機溶媒で置換した有機溶媒分散シリカゾルであって、該有機溶媒がケトン類、エーテル類、エステル類、炭化水素類及び含窒素有機化合物類からなる群から選ばれる少なくとも一種又は二種以上である第7観点乃至第9観点のいずれか一に記載の有機溶媒分散液の製造方法に関する。
第11観点として、前記シリカゾルが、メタノール、エタノール、プロパノール、ブタノール、イソプロピルアルコール、エチレングリコールモノメチルエーテル、プロピレングリコールモノメチルエーテル及びプロピレングリコールモノエチルエーテルからなる群から選ばれる少なくとも一種又は二種以上のアルコールを分散媒としたアルコール分散シリカゾル、又は該アルコール分散シリカゾルの分散媒を有機溶媒で置換した有機溶媒分散シリカゾルであって、該有機溶媒は、メチルエチルケトン、メチルイソブチルケトン、エチレングリコールモノメチルエーテル、プロピレングリコールモノメチルエーテル、プロピレングリコールモノエチルエーテル、γ-ブチルラクトン、酢酸エチル、酢酸ブチル、トルエン、キシレン、n-ペンタン、n-ヘキサン、シクロヘキサン、N,N-ジメチルホルムアミド及びN-メチルピロリドンからなる群から選ばれる少なくとも一種又は二種以上である第7観点乃至第10観点のいずれか一に記載の有機溶媒分散液の製造方法に関する。
第12観点として、前記コロイド状シリカ粒子とシアヌル酸亜鉛粒子とを含む分散質粒子の表面の少なくとも一部に、一般式(1)で示されるアルコキシ基が結合している第6観点乃至第11観点のいずれか一に記載の有機溶媒分散液の製造方法に関する。
第13観点として、前記アルコキシ基が該分散質粒子に含まれるコロイド状シリカ粒子に結合しており、該コロイド状シリカ粒子の単位表面積当たり、0.01個乃至10.0個の割合で結合している第12観点に記載の有機溶媒分散液の製造方法に関する。
第14観点として、前記分散工程により得られる、コロイド状シリカ粒子とシアヌル酸亜鉛粒子とを含む分散質粒子が、以下の(a)及び(b)を満たす、第6観点乃至第13観点のいずれか一に記載の有機溶媒分散液の製造方法に関する。
(a)レーザー回折法による平均粒子径が50nm乃至100nmであり、
(b)レーザー回折法による粒度分布測定において、頻度の積算が10%、50%、90%になる際の粒子径をそれぞれD10、D50、D90とした場合、D50/D10が1.10以上1.60未満、且つ、D90/D50が1.10以上1.60未満である。
第15観点として、前記シリカゾルの分散媒が、メタノール、エタノール、プロパノール、ブタノール、イソプロピルアルコール、メチルエチルケトン、メチルイソブチルケトンからなる群から選ばれる少なくとも一種又は二種以上である第9観点に記載の有機溶媒分散液の製造方法に関する。
第16観点として、前記シリカ粒子の平均一次粒子径が5nm乃至500nmである第6観点乃至第15観点のいずれか一に記載の有機溶媒分散液の製造方法に関する。
第17観点として、前記シアヌル酸亜鉛粒子の透過型電子顕微鏡観察による長軸の平均長さが、50nm乃至1000nmであり、且つ、短軸の平均長さが10nm乃至300nmであり、長軸と短軸の長さの比が2乃至25である第6観点乃至第16観点のいずれか一に記載の有機溶媒分散液の製造方法に関する。
第18観点として、前記分散工程において、シリカ粒子と、シアヌル酸亜鉛粒子とを、質量比で1:0.01乃至100の割合で分散させる第6観点乃至第17観点のいずれか一に記載の有機溶媒分散液の製造方法に関する。
第19観点として、前記分散工程において、コロイド状シリカ粒子と、シアヌル酸亜鉛粒子との合計固形分が0.1質量%乃至50質量%である第6観点乃至第18観点のいずれか一に記載の有機溶媒分散液の製造方法に関する。
第20観点として、前記分散工程が液中分散機で行なわれる第6観点乃至第19観点のいずれか一に記載の有機溶媒分散液の製造方法に関する。
第21観点として、前記液中分散機が、高速回転せん断型撹拌機、コロイドミル、高圧噴射式分散機、超音波分散機、容器駆動型ミル、又は媒体撹拌ミルである第20観点に記載の有機溶媒分散液の製造方法に関する。
第22観点として、前記媒体撹拌ミルが、循環式又はバッチ式である第21観点に記載の有機溶媒分散液の製造方法に関する。
さらに、本発明の有機溶媒分散液は、該分散質粒子の表面の少なくとも一部にアルコキシ基が結合することで、有機溶媒中でも高い分散安定性を維持し、長期間放置しても沈降物が生じないという効果を奏する。
また、本発明は、コロイド状シリカ粒子と、シアヌル酸亜鉛粒子とを含む分散質粒子の表面の少なくとも一部に、上記一般式(1)で示されるアルコキシ基が結合している有機溶媒分散液に関する。
ここでシリカ粉体とは、SiO2の粉体が挙げられ、公知の方法、液相法(加水分解法、ゾル-ゲル法、水熱法、共沈法、凍結乾燥法など)、気相法(溶融法、噴霧乾燥法、気相反応法(燃焼加水分解等)など)等により製造可能である。また、コロイド状シリカ粒子を公知の方法(例えば、イオン交換法、解膠法、加水分解法、反応法など)により製造し、これを乾燥して用いることもできる。
例えば、日本アエロジル(株)製AEROSIL(登録商標)シリーズ、キャボット社製Cab-O-SIL(登録商標)シリーズ、富士シリシア化学(株)Sylysia(登録商標)シリーズ、(株)トクヤマ製レオロシール(登録商標)シリーズ、エクセリカ(登録商標)シリーズ、旭化成ワッカーシリコーン(株)製HDK(登録商標)シリーズなどを挙げることができる。
シリカゾルの水分含有量は5質量%以下、又は3質量%以下、又は2質量%以下のものを用いることができる。
また、上記分散工程で用いる有機溶媒と、シリカゾルの分散媒の有機溶媒種とは同じものを用いても良いし、異なるものを用いても良い。
前記アルコキシ基は、特にR1がメチル基、エチル基、n-プロピル基、イソプロピル基、1-メトキシ-2-プロピル基であることが好ましい。このようなアルコキシ基がコロイド状シリカ粒子表面の少なくとも一部に結合することで、コロイド状シリカ粒子とシアヌル酸亜鉛粒子とを含む分散質粒子は、有機溶媒への良好な分散安定性を示し、長期保管しても沈降物が生じることを抑制することができる。
アルコキシ基のコロイド状シリカ粒子表面への結合量は、ガスクロマトグラフィー測定などにより求めることができる。ここで、コロイド状シリカ粒子の表面積は、窒素ガス吸着法(BET法)によって測定することができる。
上記シランカップリング剤の具体例としては、ビニルトリクロロシラン、ビニルトリメトキシシラン、ビニルトリエトキシシラン、2-(3,4-エポキシシクロヘキシル)エチルトリメトキシシラン、3-グリシドキシプロピルトリメトキシシラン、3-グリシドキシプロピルメチルジトリエトキシシラン、3-グリシドキシプロピルトリエトキシシラン、p-ビニルフェニルトリメトキシシラン、3-メタクリロイルオキシプロピルメチルジメトキシシラン、3-メタクリロイルオキシプロピルトリメトキシシラン、3-メタクリロイルオキシプロピルメチルジエトキシシラン、3-メタクリロイルオキシプロピルトリエトキシシラン、3-アクリロイルオキシプロピルトリメトキシシラン、N-2-(アミノエチル)-3-アミノプロピルメチルジメトキシシラン、N-2-(アミノエチル)-3-アミノプロピルメチルトリメトキシシラン、N-2-(アミノエチル)-3-アミノプロピルメチルトリエトキシシラン、3-アミノプロピルトリメトキシシラン、3-アミノプロピルトリエトキシシラン、3-トリエトキシシリル-N-(1,3-ジメチルブチリデン)プロピルアミン、N-フェニル-3-アミノプロピルトリメトキシシラン、3-クロロプロピルトリメトキシシラン、3-メルカプトプロピルメチルジメトキシシラン、3-メルカプトプロピルトリメトキシシラン、3-[メトキシ-ポリ(エチレンオキシ)プロピル]トリメトキシシラン、ビス(トリエトキシシリルプロピル)テトラスルフィド、3-イソシアナートプロピルトリエトキシシラン等が挙げられる。
また上記シランの具体例としては、メチルトリクロロシラン、ジメチルジクロロシラン、トリメチルクロロシラン、フェニルトリクロロシラン、メチルトリメトキシシラン、ジメチルジメトキシシラン、フェニルトリメトキシシラン、メチルトリエトキシシラン、ジメチルジエトキシシラン、フェニルトリエトキシシラン、n-プロピルトリメトキシシラン、n-プロピルトリエトキシシラン、ヘキシルトリメトキシシラン、ヘキシルトリエトキシシラン、デシルトリメトキシシラン、トリフルオロプロピルトリメトキシシラン、ヘキサメチルジシラザン等が挙げられる。
例えば、日産化学(株)製、商品名オルガノシリカゾルを用いることができる。
一次粒子の長軸の平均長さが50nm乃至1000nm、又は100nm乃至800nm、又は200nm乃至700nmとすることができ、且つ、短軸の平均長さが10nm乃至300nm、又は30nm乃至200nm、又は30nm乃至100nmとすることができる。該長軸と該短軸の長さの比(長軸/短軸)が2乃至25、又は2乃至10、又は2乃至5のものを用いることができる。
例えば、日産化学(株)製、商品名スターファインを用いることができる。
液中分散機は、液体媒体中に物質が粒子状に分散した状態をつくるための操作や、液体媒体中で物質の一次粒子径を小さくする操作を行うことができる。液中分散機としては、凝集体を分散させる外力により装置を分類することができ、例えば、高速回転せん断型撹拌機、コロイドミル、ロールミル、高圧噴射式分散機、超音波分散機、容器駆動型ミル、媒体攪拌ミルなどが挙げられる。高速回転せん断型撹拌機は、攪拌翼、回転数を適宜設定することで上記分散工程に使用することができる。容器駆動型ミルとしては、回転ミル、振動ミル、遊星ミルが挙げられる。媒体撹拌ミルとしては、循環式又はバッチ式の装置が挙げられる。
これら装置は、市販装置を用いることができ、一例として以下のものが挙げられるが、これらに限定されない。
媒体撹拌ミルとしては、例えば、サンドグラインダー(アイメックス(株)製)、アペックスミル((株)広島メタル&マシナリー(旧 寿工業(株))製)、アトライタ(日本コークス工業(株)製)、パールミル(アシザワ・ファインテック(株)製)等のボールミル、ビーズミル、サンドミルを用いることができる。分散メディアの材質や大きさ、また分散メディアの撹拌のための装置の回転数や反応時間等は、有機溶媒の種類や粘度等に合わせて適宜調整すればよい。
D50/D10は1.10以上1.60未満、又は1.10以上1.50未満、又は1.10以上1.46未満とすることができる。D90/D50は1.10以上1.60未満、又は1.10以上1.55未満、又は1.10以上1.50未満とすることができる。
本発明では、上記分散質粒子が上記の平均粒子径範囲を満たし、且つ上記のD50/D10及びD90/D50を満たすことにより、分散安定性が良好な有機溶媒分散液が得られ、長期保管が可能となる。
以下の手順にて、シリカゾル及びシアヌル酸亜鉛粒子を準備した。
(1)下記シリカゾルを準備した。
・メタノール分散シリカゾル(日産化学(株)製、BET法による平均一次粒子径12nm、固形分30.5質量%)
・メチルエチルケトン(MEK)分散シリカゾル(日産化学(株)製、BET法による平均一次粒子径12nm、固形分30.8質量%)
・プロピレングリコールモノメチルエーテル(PGME)分散シリカゾル(日産化学(株)製、BET法による平均一次粒子径12nm、固形分30.5質量%)
・水分散シリカゾル(日産化学(株)製、商品名スノーテックス-N40、BET法による平均一次粒子径21.4nm、固形分40.4質量%)
(2)下記シアヌル酸亜鉛粒子を準備した。
・シアヌル酸亜鉛粒子:日産化学(株)製、商品名スターファイン(登録商標)(レーザー回折法の測定による平均粒子径1.7μm、透過型電子顕微鏡観察による1次粒子の平均長軸:400nm乃至600nm、短軸:50nm乃至70nm、長軸/短軸比5.7乃至12、比表面積15m2/g、(酸化亜鉛)/(シアヌル酸)換算のモル比2.5)
(3)以下の方法により有機溶媒分散液のpHを測定した。
有機溶媒分散液と純水を同質量にて混合したのち、pHメーター(東亜ディーティーケー(株)製)を用いて20℃にて測定した。
(4)レーザー回折法により有機溶媒分散液中の分散質粒子の平均粒子径を測定した。
コロイド状シリカ粒子とシアヌル酸亜鉛粒子を含む分散液を純水で希釈した後、(株)島津製作所製、商品名SALD-7500nanoを用いて測定した。ここで、屈折率の代入値として[1.70-0.2i]を用いた。
(5)以下の方法に従い、有機溶媒分散液のオストワルド粘度を測定した。
オストワルド粘度計(柴田科学(株)製)を用いて25℃の恒温槽中にて測定した。
(6)以下の方法に従い、有機溶媒分散液の分散安定性(沈降性)を評価した。
得られた有機溶媒分散液を100mLのポリプロピレン製容器に105g入れ、室温にて3か月間放置し、放置後の容器底面の沈降物の有無を確認した。沈降物が無ければ『分散安定性 良好』、沈降物があれば『分散安定性 不良』と評価した。
(7)以下の方法に従い、有機溶媒分散液の溶媒に含まれる水分量を測定した。
カールフィッシャー水分計(京都電子工業(株)製)を用いてカールフィッシャー滴定法にて水分量を測定した。なお、水分散液の溶媒に含まれる水分量は100%と定義した。
(8)以下の方法に従い、シリカ粒子表面に結合したアルコキシ基の結合量を測定した。
(8.1)30mLの遠心分離管に有機溶媒分散シリカゾル3mLを入れ、トルエン20mLを添加する。
(8.2)遠心分離機(5000rpm×30分)にかけた後、上澄み液を除去する。
(8.3)アセトン4mLを添加してゲルを再溶解させた後、トルエン10mL、ヘキサン4mLを添加し、遠心分離(5000rpm×30分)を行う。
(8.4)さらに(8.2)から(8.3)までを再度行う。
(8.5)得られたゲルを60℃で真空乾燥後、得られた粉末を乳鉢で粉砕し、150℃2時間で乾燥する。
上記で得られた粉末0.2gを0.05N水酸化ナトリウム水溶液10mLと混合・溶解させ、アルコール量をガスクロマトグラフィー測定することで、表面に結合したアルコキシ基量を測定した。
得られたアルコキシ基量を、シリカ粒子の窒素吸着法による表面積値を用いて、シリカ粒子の単位表面積(nm2)あたりの個数として算出した。
250mLのポリプロピレン製容器にメタノール分散シリカゾル34.3gとメタノール60.2gを入れ、タービン翼を装備した撹拌機で撹拌しながらシアヌル酸亜鉛粒子10.5gを添加し、混合スラリー(SiO2濃度10.0質量%、シアヌル酸亜鉛の濃度10.0質量%)を調製した。次いで、250mLのポリプロピレン製容器に混合スラリー105gと直径0.5mm乃至0.7mmのガラスビーズ180gを入れ、同容器を回転数150rpmに設定したボールミル回転台に載せ、30時間湿式粉砕し、メタノール分散液を得た。
得られたメタノール分散液の固形分(シリカ+シアヌル酸亜鉛)濃度は20質量%、pH6.6、レーザー回折法により測定された平均粒子径は68nm、粘度1.0mPa・sであった。分散安定性について評価した。結果を表1に示す。
250mLのポリプロピレン製容器にMEK分散シリカゾル34.3gとMEK60.2gを入れ、タービン翼を装備した撹拌機で撹拌しながらシアヌル酸亜鉛粒子10.5gを添加し、混合スラリー(SiO2濃度10.0質量%、シアヌル酸亜鉛の濃度10.0質量%)を調製した。次いで、250mLのポリプロピレン製容器に混合スラリー105gと直径0.5-0.7mmのガラスビーズ180gを入れ、同容器を回転数150rpmに設定したボールミル回転台に載せ、30時間湿式粉砕し、MEK分散液を得た。
得られたMEK分散液の固形分(シリカ+シアヌル酸亜鉛)濃度は20質量%、pH6.6、レーザー回折法により測定された平均粒子径は70nm、粘度1.3mPa・sであった。分散安定性について評価した結果を表1に示す。
250mLのポリプロピレン製容器にPGME分散シリカゾル34.4gとPGME60.1gを入れ、タービン翼を装備した撹拌機で撹拌しながらシアヌル酸亜鉛粒子10.5gを添加し、混合スラリー(SiO2濃度10.0質量%、シアヌル酸亜鉛の濃度10.0質量%)を調製した。次いで、250mLのポリプロピレン製容器に混合スラリー105gと直径0.5-0.7mmのガラスビーズ180gを入れ、同容器を回転数150rpmに設定したボールミル回転台に載せ、30時間湿式粉砕し、PGME分散液を得た。
得られたPGME分散液の固形分(シリカ+シアヌル酸亜鉛)濃度は20質量%、pH6.2、レーザー回折法により測定された平均粒子径は144nm、粘度5.8mPa・sであった。分散安定性について評価した結果を表1に示す。
250mLのポリプロピレン製容器にメタノール94.5gを入れ、タービン翼を装備した撹拌機で撹拌しながらシアヌル酸亜鉛粒子10.5gを添加し、混合スラリー(シアヌル酸亜鉛の濃度10.0質量%、pH7.0)を調製した。得られた混合スラリーのレーザー回折法により測定された平均粒子径は1754nmであった。分散安定性について評価した。結果を表1に示す。
500mLのポリプロピレン製容器に水分散シリカゾル125gと純水325gを入れ、タービン翼を装備した撹拌機で撹拌しながらシアヌル酸亜鉛粒子50gを添加し、混合スラリー(SiO2濃度10.0質量%、シアヌル酸亜鉛の濃度10.0質量%)を調製した。次いで、250mLのポリプロピレン製容器に混合スラリー150gと直径0.7-1.0mmのガラスビーズ180gを入れ、同容器を回転数165rpmに設定したボールミル回転台に載せ、30時間湿式粉砕し、水分散液を得た。
得られた水分散液の固形分(シリカ+シアヌル酸亜鉛)濃度は20質量%、pH8.1、レーザー回折法により測定された平均粒子径は141nm、粘度8.3mPa・sであった。分散安定性について評価した。結果を表1に示す。
250mLのポリプロピレン製容器にメタノール94.5gを入れ、タービン翼を装備した撹拌機で撹拌しながらシアヌル酸亜鉛粒子10.5gを添加し、混合スラリー(シアヌル酸亜鉛の濃度10.0質量%)を調製した。次いで、直径0.7-1.0mmのガラスビーズ180gを入れ、同容器を回転数165rpmに設定したボールミル回転台に載せ、30時間湿式粉砕し、メタノール分散液を得た。得られたメタノール分散液の固形分(シアヌル酸亜鉛)濃度は10質量%、pH7.0、レーザー回折法により測定された平均粒子径は1047nmであった。分散安定性について評価した。結果を表1に示す。
250mLのポリプロピレン製容器にMEK94.5gを入れ、タービン翼を装備した撹拌機で撹拌しながらシアヌル酸亜鉛粒子10.5gを添加し、混合スラリー(シアヌル酸亜鉛の濃度10.0質量%)を調製した。次いで、直径0.7-1.0mmのガラスビーズ180gを入れ、同容器を回転数165rpmに設定したボールミル回転台に載せ、30時間湿式粉砕し、MEK分散液を得た。得られたMEK分散液の固形分(シアヌル酸亜鉛)濃度は10質量%、pH6.9、レーザー回折法により測定された平均粒子径は1810nmであった。分散安定性について評価した。結果を表1に示す。
250mLのポリプロピレン製容器にPGME94.5gを入れ、タービン翼を装備した撹拌機で撹拌しながらシアヌル酸亜鉛粒子10.5gを添加し、混合スラリー(シアヌル酸亜鉛の濃度10.0質量%)を調製した。次いで、直径0.7-1.0mmのガラスビーズ180gを入れ、同容器を回転数165rpmに設定したボールミル回転台に載せ、30時間湿式粉砕し、PGME分散液を得た。得られたPGME分散液の固形分(シアヌル酸亜鉛)濃度は10質量%、pH6.6、レーザー回折法により測定された平均粒子径は177nmであった。分散安定性について評価した。結果を表1に示す。
一方、コロイド状シリカ粒子を含まない比較例1の有機溶媒分散液の分散安定性は不良であり、沈降物が生じていたため、粘度は測定不可だった。また、比較例2の水分散液の分散安定性は不良であることが確認された。さらに、比較例3乃至比較例5の有機溶媒分散液は、シアヌル酸亜鉛粒子を有機溶媒に分散させる分散工程を経て製造されたものであるが、コロイド状シリカ粒子を含まないために、分散安定性は不良であることが確認され、本発明の優位性が示された。
Claims (22)
- 前記アルコキシ基が前記分散質粒子に含まれるコロイド状シリカ粒子に結合しており、該コロイド状シリカ粒子の単位表面積当たり、0.01個乃至10.0個の割合で結合している請求項1に記載の有機溶媒分散液。
- 前記分散質粒子が有機溶媒に分散した分散液に含まれる水分量が5質量%以下である請求項1又は請求項2に記載の有機溶媒分散液。
- 前記有機溶媒がアルコール類、ケトン類、エーテル類、エステル類、炭化水素類及び含窒素有機化合物類からなる群から選ばれる少なくとも一種又は二種以上である請求項1乃至請求項3のいずれか一項に記載の有機溶媒分散液。
- 前記コロイド状シリカ粒子とシアヌル酸亜鉛粒子とを含む分散質粒子が、以下の(a)及び(b)を満たす、請求項1乃至請求項4のいずれか一項に記載の有機溶媒分散液。
(a)レーザー回折法による平均粒子径が50nm乃至100nmであり、
(b)レーザー回折法による粒度分布測定において、頻度の積算が10%、50%、90%になる際の粒子径をそれぞれD10、D50、D90とした場合、D50/D10が1.10以上1.60未満、且つ、D90/D50が1.10以上1.60未満である。 - シリカ粒子とシアヌル酸亜鉛粒子と有機溶媒とを混合し、シリカ粒子とシアヌル酸亜鉛粒子とを含む分散質粒子を有機溶媒に分散させる分散工程を含む、コロイド状シリカ粒子とシアヌル酸亜鉛粒子とを含む分散質粒子が有機溶媒に分散された有機溶媒分散液の製造方法。
- シリカ粒子とシアヌル酸亜鉛粒子と有機溶媒との混合が、有機溶媒を分散媒としたシリカゾルとシアヌル酸亜鉛粒子との混合である請求項6に記載の有機溶媒分散液の製造方法。
- 前記シリカゾルの水分含有量が5質量%以下である請求項7に記載の有機溶媒分散液の製造方法。
- 前記シリカゾルの分散媒が、アルコール類、ケトン類、エーテル類、エステル類、炭化水素類及び含窒素有機化合物類からなる群から選ばれる少なくとも一種又は二種以上である請求項7又は請求項8に記載の有機溶媒分散液の製造方法。
- 前記シリカゾルが、アルコール分散シリカゾル、又は該アルコール分散シリカゾルの分散媒を有機溶媒で置換した有機溶媒分散シリカゾルであって、該有機溶媒がケトン類、エーテル類、エステル類、炭化水素類及び含窒素有機化合物類からなる群から選ばれる少なくとも一種又は二種以上である請求項7乃至請求項9のいずれか一項に記載の有機溶媒分散液の製造方法。
- 前記シリカゾルが、メタノール、エタノール、プロパノール、ブタノール、イソプロピルアルコール、エチレングリコールモノメチルエーテル、プロピレングリコールモノメチルエーテル及びプロピレングリコールモノエチルエーテルからなる群から選ばれる少なくとも一種又は二種以上のアルコールを分散媒としたアルコール分散シリカゾル、又は該アルコール分散シリカゾルの分散媒を有機溶媒で置換した有機溶媒分散シリカゾルであって、該有機溶媒は、メチルエチルケトン、メチルイソブチルケトン、エチレングリコールモノメチルエーテル、プロピレングリコールモノメチルエーテル、プロピレングリコールモノエチルエーテル、γ-ブチルラクトン、酢酸エチル、酢酸ブチル、トルエン、キシレン、n-ペンタン、n-ヘキサン、シクロヘキサン、N,N-ジメチルホルムアミド及びN-メチルピロリドンからなる群から選ばれる少なくとも一種又は二種以上である請求項7乃至請求項10のいずれか一項に記載の有機溶媒分散液の製造方法。
- 前記アルコキシ基が該分散質粒子に含まれるコロイド状シリカ粒子に結合しており、該コロイド状シリカ粒子の単位表面積当たり、0.01個乃至10.0個の割合で結合している請求項12に記載の有機溶媒分散液の製造方法。
- 前記分散工程により得られる、コロイド状シリカ粒子とシアヌル酸亜鉛粒子とを含む分散質粒子が、以下の(a)及び(b)を満たす、請求項6乃至請求項13のいずれか一項に記載の有機溶媒分散液の製造方法。
(a)レーザー回折法による平均粒子径が50nm乃至100nmであり、
(b)レーザー回折法による粒度分布測定において、頻度の積算が10%、50%、90%になる際の粒子径をそれぞれD10、D50、D90とした場合、D50/D10が1.10以上1.60未満、且つ、D90/D50が1.10以上1.60未満である。 - 前記シリカゾルの分散媒が、メタノール、エタノール、プロパノール、ブタノール、イソプロピルアルコール、メチルエチルケトン、メチルイソブチルケトンからなる群から選ばれる少なくとも一種又は二種以上である請求項9に記載の有機溶媒分散液の製造方法。
- 前記シリカ粒子の平均一次粒子径が5nm乃至500nmである請求項6乃至請求項15のいずれか一項に記載の有機溶媒分散液の製造方法。
- 前記シアヌル酸亜鉛粒子の透過型電子顕微鏡観察による長軸の平均長さが、50nm乃至1000nmであり、且つ、短軸の平均長さが10nm乃至300nmであり、長軸と短軸の長さの比が2乃至25である請求項6乃至請求項16のいずれか一項に記載の有機溶媒分散液の製造方法。
- 前記分散工程において、シリカ粒子と、シアヌル酸亜鉛粒子とを、質量比で1:0.01乃至100の割合で分散させる請求項6乃至請求項17のいずれか一項に記載の有機溶媒分散液の製造方法。
- 前記分散工程において、コロイド状シリカ粒子と、シアヌル酸亜鉛粒子との合計固形分が0.1質量%乃至50質量%である請求項6乃至請求項18のいずれか一項に記載の有機溶媒分散液の製造方法。
- 前記分散工程が液中分散機で行なわれる請求項6乃至請求項19のいずれか一項に記載の有機溶媒分散液の製造方法。
- 前記液中分散機が、高速回転せん断型撹拌機、コロイドミル、高圧噴射式分散機、超音波分散機、容器駆動型ミル、又は媒体撹拌ミルである請求項20に記載の有機溶媒分散液の製造方法。
- 前記媒体撹拌ミルが、循環式又はバッチ式である請求項21に記載の有機溶媒分散液の製造方法。
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