WO2014141992A1 - 酸化チタン分散液、酸化チタン塗布液、及び光触媒塗膜 - Google Patents
酸化チタン分散液、酸化チタン塗布液、及び光触媒塗膜 Download PDFInfo
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- WO2014141992A1 WO2014141992A1 PCT/JP2014/055741 JP2014055741W WO2014141992A1 WO 2014141992 A1 WO2014141992 A1 WO 2014141992A1 JP 2014055741 W JP2014055741 W JP 2014055741W WO 2014141992 A1 WO2014141992 A1 WO 2014141992A1
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Definitions
- the present invention relates to a titanium oxide dispersion liquid for forming a coating film having photocatalytic activity, a titanium oxide coating liquid containing the titanium oxide dispersion liquid, a photocatalytic coating film formed using the titanium oxide coating liquid, and a photocatalyst coating.
- a titanium oxide dispersion liquid for forming a coating film having photocatalytic activity
- a titanium oxide coating liquid containing the titanium oxide dispersion liquid a photocatalytic coating film formed using the titanium oxide coating liquid
- a photocatalyst coating is about the body.
- titanium oxide particles exhibit a strong oxidizing action when they absorb ultraviolet rays, they have recently been used as photocatalysts in various applications (for example, (1) to (5) below).
- Air purification by decomposing environmental pollutants such as nitrogen oxides (NOx) and sulfur oxides (SOx) emitted from automobile exhaust gas, etc.
- Deodorization by decomposing the malodorous substances of (3) Purified water by decomposing organochlorine compounds such as tetrachloroethylene and trihalomethane (4) Sterilization, and further by decomposing the carcass (5) By decomposing oil Antifouling to prevent dirt caused by sand and dirt adhering to oil
- the titanium oxide photocatalyst may be used in a state of being suspended in a solution or in a state of being supported on a substrate.
- the former is more active because the size of the surface area is proportional to the photocatalytic ability, but the latter is often adopted from the viewpoint of practicality.
- a method of mainly adhering a highly dispersed titanium oxide photocatalyst using a dispersant to a substrate using a binder component is employed.
- dispersants use organic polymer compounds such as polycarboxylates, naphthalenesulfonic acid formalin condensate salts, polyethylene glycol, and inorganic compounds such as hexametaphosphate, pyrophosphate, phosphate, oxalate, etc.
- organic polymer compounds such as polycarboxylates, naphthalenesulfonic acid formalin condensate salts, polyethylene glycol, and inorganic compounds such as hexametaphosphate, pyrophosphate, phosphate, oxalate, etc.
- Patent Documents 1 to 3 When a dispersant is used, the titanium oxide photocatalyst is highly dispersed, and the specific surface area is increased to improve the photocatalytic performance.
- the surface of the titanium oxide photocatalyst is Oxidation acts preferentially on the dispersant in the covering portion, and the apparent photocatalytic effect is reduced.
- the original photocatalytic effect cannot be exhibited.
- the initial dispersibility is excellent, but it is difficult to maintain a high dispersion state for a long time, and the dispersion stability is low.
- the dispersant present on the surface of the titanium oxide photocatalyst is preferentially decomposed, so an amount of the organic polymer compound sufficient to highly disperse the titanium oxide photocatalyst is used. Then, it was a problem that it took a long time to develop the original photocatalytic effect. Further, when the molecular weight of the organic polymer compound is reduced, it is possible to shorten the waiting time until the photocatalytic activity is exhibited, but it is a problem that it is difficult to obtain the effect as a dispersant.
- Patent Document 4 a titanium peroxide and a polysaccharide such as chitosan or cellulose are used as the binder component.
- the polysaccharides such as chitosan and cellulose are insoluble in water, it is necessary to dissolve in a large amount of hydrogen peroxide at a high temperature when preparing the binder solution, the coating solution becomes acidic, It was a problem to be limited.
- the present inventors have formulated a transition metal compound-supported titanium oxide particle with a solvent and a specific dispersant. Dispersion of titanium oxide that can easily form a photocatalyst coating film that is excellent in dispersibility and dispersion stability, and that exhibits excellent photocatalytic activity quickly by coating and drying in the vicinity of a neutral region. It has been found that a liquid can be obtained. The present invention has been completed based on these findings.
- the present invention provides a titanium oxide dispersion containing transition metal compound-supported titanium oxide particles (A), a dispersant (B) made of polyacrylic acid or a salt thereof, and a solvent (C).
- the present invention also provides the titanium oxide dispersion, wherein the polyacrylic acid or a salt thereof in the dispersant (B) is a polyacrylic acid alkali metal salt.
- the present invention also provides the above-mentioned titanium oxide dispersion in which the weight average molecular weight of polyacrylic acid or a salt thereof in the dispersant (B) is in the range of 1,000 to 100,000.
- the present invention also provides the above-described titanium oxide dispersion in which the transition metal compound-supported titanium oxide particles (A) are iron compound-supported titanium oxide particles.
- the present invention also provides the above-described titanium oxide dispersion in which the transition metal compound-supported titanium oxide particles (A) are particles that support the transition metal compound on the oxidation reaction surface of the titanium oxide particles.
- the present invention also provides the above-mentioned titanium oxide dispersion, wherein the titanium oxide particles in the transition metal compound-supported titanium oxide particles (A) are rutile type titanium oxide particles.
- the present invention also provides a titanium oxide coating liquid containing the above titanium oxide dispersion and at least one binder component (D) selected from titanium peroxide, a silicon compound, and a fluorine resin.
- D binder component selected from titanium peroxide, a silicon compound, and a fluorine resin.
- the present invention also provides the above-described titanium oxide coating solution in which the binder component (D) contains at least titanium peroxide.
- the present invention also provides a photocatalytic coating film formed using the titanium oxide coating solution.
- the present invention also provides a photocatalyst-coated body in which the photocatalyst coating film is provided on the surface of a substrate.
- the present invention relates to the following.
- the titanium oxide dispersion according to (1) or (2), wherein the polyacrylic acid or a salt thereof in the dispersant (B) has a weight average molecular weight in the range of 1,000 to 100,000.
- the transition metal compound-supported titanium oxide particles (A) have a (110) (111) plane, and the rutile titanium oxide in which an iron compound is supported on the (111) plane, and / or (110)
- the titanium oxide according to any one of (1) to (6) which is a rutile type titanium oxide particle having a (111) (001) plane and having an iron compound supported on the (001) (111) plane Dispersion.
- (11) A photocatalyst-coated body in which the photocatalyst coating film according to (10) is provided on the surface of a substrate.
- the titanium oxide dispersion of the present invention uses polyacrylic acid or a salt thereof as a dispersant, it can be easily dissolved in a near-neutral region near room temperature without being dissolved in a large amount of hydrogen peroxide at a high temperature. It can be prepared, has excellent dispersion stability, and can maintain a highly dispersed state over a long period of time. Further, the standby time until the titanium oxide photocatalyst decomposes the dispersant and the original photocatalytic performance is exhibited can be shortened, and the immediate effect of the photocatalytic performance can be ensured.
- the titanium oxide coating liquid of this invention contains the said titanium oxide dispersion liquid, it can prepare in the area
- transition metal compound-supported titanium oxide particles (A) are used as a photocatalyst.
- the photocatalytic coating film formed using the titanium oxide coating solution of the present invention has responsiveness over a wide wavelength range from the ultraviolet region to the visible light region, and is usually used for sunlight, incandescent lamps, fluorescent lamps and the like. High catalytic activity even under light source in living space.
- transition metal compound-supported titanium oxide particles (A) examples include rutile type, anatase type, brookite type titanium oxide particles, and the like.
- rutile-type titanium oxide particles are particularly preferable in that they have a shape with a large aspect ratio.
- the transition metal compound may be supported on the titanium oxide particles in any state such as a transition metal ion, a transition metal simple substance, a transition metal salt, a transition metal oxide, a transition metal hydroxide, or a transition metal complex.
- transition metal compound those having an absorption spectrum in the visible light region and capable of injecting electrons into the conduction band in an excited state are preferable.
- compounds of Group 3 to Group 11 elements of the periodic table, especially Table 8 to Group 11 element compounds are preferred, and iron compounds [especially trivalent iron compounds] are particularly preferred.
- trivalent iron compounds are easy to adsorb and divalent iron compounds are difficult to adsorb. This is because a metal compound can be supported.
- “supporting a transition metal compound in a surface selective manner” means an amount exceeding 50% (preferably 70% or more, particularly preferably) of the transition metal compound supported on titanium oxide particles having an exposed crystal face. 80% or more) is supported on a specific surface (for example, one specific surface or two surfaces) instead of all of the two or more exposed crystal surfaces.
- the loading of the transition metal compound can be determined by confirming a signal derived from the transition metal compound on the exposed crystal plane using a transmission electron microscope (TEM) or an energy dispersive X-ray fluorescence spectrometer (EDX).
- the amount of the transition metal compound supported is, for example, 50 ppm or more, preferably 100 ppm or more, more preferably 200 ppm or more, particularly preferably 300 ppm or more, and most preferably 500 ppm or more, based on the weight of the titanium oxide particles.
- the upper limit of the loading amount of the transition metal compound is, for example, about 5000 ppm, preferably 3000 ppm, particularly preferably 2000 ppm.
- the transition metal compound is selectively supported on one of the oxidation reaction surface or the reduction reaction surface (especially the oxidation reaction surface) of the exposed crystal surface of the titanium oxide particles.
- the separation of excited electrons and holes can be improved, the recombination of excited electrons and holes and the progress of reverse reaction can be suppressed to a very low level, and higher photocatalytic activity can be exhibited. It is preferable in that it can be performed.
- examples of the main exposed crystal plane of the rutile type titanium oxide particles include (110) (001) (111) (011) planes.
- examples of rutile type titanium oxide particles include rutile type titanium oxide particles having a (110) (111) plane, rutile type titanium oxide particles having a (110) (011) plane, and (001) (110) (111) plane.
- rutile-type titanium oxide particles having in particular, the reaction fields of the oxidation reaction and the reduction reaction can be separated more spatially, and the recombination of excited electrons and holes and the progress of the reverse reaction can be suppressed (110 )
- Rutile type titanium oxide particles having a (111) plane and rutile type titanium oxide particles having a (001) (110) (111) plane are preferred.
- the (111) plane and the (001) plane are oxidation reaction planes, and the (110) plane is a reduction reaction plane.
- transition metal compound-supported titanium oxide particles in the present invention among others, rutile-type titanium oxide having (110) (111) faces and iron compounds supported on the (111) faces, and / or ( The rutile-type titanium oxide particles having (110) (111) (001) planes and an iron compound supported on the (001) (111) planes are preferable.
- titanium oxide particles those produced by a known method can be used.
- rutile-type titanium oxide particles having (110) (111) faces and rutile-type titanium oxide particles having (001) (110) (111) faces include, for example, a titanium compound and an aqueous medium. It can be synthesized by hydrothermal treatment [for example, 100 to 200 ° C., 3 to 48 hours (preferably 6 to 12 hours)] (for example, water or a mixture of water and a water-soluble organic solvent).
- titanium compound examples include a trivalent titanium compound and a tetravalent titanium compound.
- examples of the trivalent titanium compound include titanium trihalides such as titanium trichloride and titanium tribromide.
- titanium trichloride TiCl 3
- TiCl 3 titanium trichloride
- Examples of the tetravalent titanium compound include a compound represented by the following formula (1).
- Ti (OR) t X 4-t (1) (Wherein R represents a hydrocarbon group, X represents a halogen atom, t represents an integer of 0 to 3)
- hydrocarbon group for R examples include C 1-4 aliphatic hydrocarbon groups such as methyl, ethyl, propyl, isopropyl, n-butyl, sec-butyl, tert-butyl, and the like.
- halogen atom in X examples include chlorine, bromine and iodine atoms.
- titanium tetrahalides such as TiCl 4 , TiBr 4 , and TiI 4 ; Ti (OCH 3 ) Cl 3 , Ti (OC 2 H 5 ) Cl 3 , and Ti (OC 4).
- titanium tetravalent titanium compound in the present invention titanium tetrahalide is preferable, and titanium tetrachloride (TiCl 4 ) is particularly preferable because it is inexpensive and easily available.
- the reaction temperature is 110 to 220 ° C. (preferably 130 to 220 ° C.), and the reaction temperature is higher than the saturated vapor pressure for 2 hours in an aqueous medium.
- Rutile-type titanium oxide particles having (110) (111) faces and / or rutile-type titanium oxide particles having (001) (110) (111) faces by hydrothermal treatment as described above (preferably 5 to 15 hours) can be synthesized.
- the rutile type titanium oxide having (001) (110) (111) plane is obtained by converting rutile type titanium oxide particles having (110) (111) plane into sulfuric acid (preferably sulfuric acid having a high concentration of 50% by weight or more, particularly It is also possible to synthesize by eroding (dissolving) the ridges or apexes of the titanium oxide particles by adding them into concentrated sulfuric acid (preferably concentrated sulfuric acid) and stirring them under heating.
- sulfuric acid preferably sulfuric acid having a high concentration of 50% by weight or more
- the titanium oxide particles obtained by the above method can be separated and purified by separation means such as filtration, concentration, distillation, extraction, crystallization, recrystallization, column chromatography and the like, or separation means combining these.
- the specific surface area of the titanium oxide particles is, for example, 10 m 2 / g or more, preferably 10 to 200 m 2 / g, more preferably 10 to 150 m 2 / g, still more preferably 30 to 150 m 2 / g, particularly preferably 50 to 100 m 2 / g, most preferably 60 to 100 m 2 / g.
- the specific surface area of the titanium oxide particles is less than the above range, the ability to adsorb the reactant tends to decrease and the photocatalytic ability tends to decrease, while when the specific surface area of the titanium oxide particles exceeds the above range, There is a tendency that the separability of holes is lowered and the photocatalytic ability is lowered.
- the shape of the titanium oxide particles is not particularly limited, but is preferably rod-shaped or needle-shaped, and the average aspect ratio (major axis / minor axis) of the titanium oxide particles is, for example, 1.5 or more, preferably 1.5 to 100, and more preferably. It is 1.5 to 50, particularly preferably 1.5 to 20, and most preferably 2 to 15.
- the average aspect ratio is lower than the above range (that is, when the shape of the titanium oxide particles becomes more spherical)
- the pores are formed in the photocatalyst coating film because it is packed more densely.
- the surface area is reduced, and the exposure amount of the photocatalyst to the surface of the coating film is reduced.
- the photocatalytic ability tends to be reduced.
- the average aspect ratio is a value obtained by the following measuring method for a sample obtained by the following adjusting method.
- sample preparation method 1. Put a small amount (about half of the earpick size spatula) of titanium oxide particles into a 9 mL glass sample bottle, add 7 mL of ethanol, and disperse the ultrasonic wave in ethanol over 5 minutes using an ultrasonic cleaner. Get. 2. One drop of the obtained ethanol dispersion is taken with a glass spoid, dropped on a sample stage for SEM and allowed to dry naturally, and then platinum deposition is performed for 30 seconds.
- ⁇ Measurement method> Use a field emission scanning electron microscope (trade name “FE-SEM JSM-6700F”, manufactured by JEOL Ltd., acceleration voltage: 15 kV, WD: about 3 mm, magnification: 200,000 times) to randomly crystallize particles Observe, extract three representative points, and 30 particles that are not extremely large or small in appearance in the entire extracted SEM photograph and have a clear outline centered on average-sized particles Extracted and copied to OHP sheet, and for each of these particles, find each short diameter (width orthogonal to the maximum long diameter) using image analysis software (trade name “WinROOF Version5.6”, manufactured by Mitani Corp.) These values were averaged to obtain an average minor axis. Further, the average major axis (maximum major axis) was determined by the same method, and the ratio (average major axis / average minor axis) was taken as the average aspect ratio.
- the transition metal compound can be supported on the titanium oxide particles by, for example, an impregnation method in which the titanium oxide particles are impregnated with the transition metal compound.
- the impregnation can be performed by adding a transition metal compound to the aqueous dispersion of titanium oxide particles.
- a transition metal compound for example, when a trivalent iron compound is used as the transition metal compound, an iron compound ( For example, it can be performed by adding iron nitrate (III), iron sulfate (III), iron chloride (III) and the like.
- the impregnation time is, for example, about 30 minutes to 24 hours, preferably 1 to 10 hours.
- the excitation light when impregnating the titanium oxide particles with the transition metal compound.
- the electrons in the valence band of the titanium oxide particles are excited in the conduction band, holes are generated in the valence band, and excited electrons are generated in the conduction band, which are diffused to the particle surface. Excited electrons and holes are separated according to the characteristics to form an oxidation reaction surface and a reduction reaction surface.
- a trivalent iron compound is impregnated as a transition metal compound in this state, for example, the trivalent iron compound is adsorbed on the oxidation reaction surface, but on the reduction reaction surface, the trivalent iron compound is a divalent iron compound.
- the divalent iron compound Since the divalent iron compound has the property of being difficult to adsorb, it can be eluted in the solution, and as a result, transition metal compound-supported titanium oxide particles can be obtained in which the iron compound is selectively supported on the oxidation reaction surface. it can.
- the excitation light As a method for irradiating the excitation light, it is only necessary to irradiate light having energy equal to or higher than the band gap energy. For example, it can be performed by irradiating ultraviolet rays.
- the ultraviolet irradiation means for example, an ultraviolet exposure apparatus using a light source that efficiently generates ultraviolet rays such as a medium / high pressure mercury lamp, a UV laser, a UV-LED, and a black light can be used.
- the irradiation amount of the excitation light is, for example, about 0.1 to 300 mW / cm 2 , preferably 1 to 5 mW / cm 2 .
- a sacrificial agent may be added during the impregnation.
- the transition metal compound can be supported with high selectivity on a specific exposed crystal plane on the surface of the titanium oxide particles.
- the sacrificial agent it is preferable to use an organic compound that easily emits electrons.
- alcohols such as methanol and ethanol
- carboxylic acids such as acetic acid
- EDTA ethylenediaminetetraacetic acid
- TAA triethanolamine
- the addition amount of the sacrificial agent can be adjusted as appropriate, and is, for example, about 0.5 to 5.0% by weight, preferably 1.0 to 2.0% by weight of the titanium oxide solution. An excessive amount of the sacrificial agent may be used.
- the transition metal compound-supported titanium oxide particles obtained by the above method can be separated and purified by separation means such as filtration, concentration, distillation, extraction, crystallization, recrystallization, column chromatography, etc., or a combination means combining these. .
- Dispersant (B) polyacrylic acid or a salt thereof is used as a dispersant. Since polyacrylic acid and polyacrylate are dissolved in water, a titanium oxide dispersion and a titanium oxide coating solution can be easily prepared by a simple operation. Moreover, since the aqueous solution of polyacrylic acid or its salt (especially polyacrylic acid salt) is near neutrality, the use application of the titanium oxide dispersion liquid and titanium oxide coating liquid containing this is excellent and versatility is excellent.
- polyacrylic acid or a salt thereof has a small molecular weight per carboxyl group or a salt thereof (—COOM; M is a hydrogen atom, a metal atom, an ammonium ion, etc.), and an addition amount necessary for dispersing titanium oxide particles can be reduced. Can be reduced. Therefore, the amount (concentration) of organic groups in the photocatalyst coating film formed from the titanium oxide coating solution can be reduced, and the waiting time until the photocatalyst decomposes the dispersant and the original photocatalytic performance is exhibited can be shortened. That is, the immediate effect of the photocatalytic performance can be secured.
- the generation amount of VOC volatile organic compounds
- the generation amount of VOC such as acetaldehyde due to the decomposition of the dispersant
- the generation of odor can be suppressed.
- the photocatalyst coating film formed from the titanium oxide coating liquid using polyacrylic acid or a salt thereof as a dispersant has high hardness, there is an advantage that the coating film is hardly damaged.
- polyacrylic acid or its salt well-known polyacrylic acid and polyacrylate can be used, for example, polyacrylic acid; lithium polyacrylate, sodium polyacrylate, potassium polyacrylate, polyacrylic acid Examples include alkali metal salts of polyacrylic acid such as cesium; ammonium polyacrylate. Among these, sodium polyacrylate, potassium polyacrylate, and ammonium polyacrylate are preferable in that coloring can be suppressed, and sodium polyacrylate and potassium polyacrylate are particularly preferable.
- the weight average molecular weight of the polyacrylic acid or a salt thereof is not particularly limited, but for example, it is appropriately selected from the range of 1000 to 100,000, preferably 1200 to 50000, more preferably 1500 to 30000, and particularly preferably 6000 to 20000. it can.
- the transition metal compound-supported titanium oxide particles can be stably dispersed by using a small amount.
- the weight average molecular weight of polyacrylic acid or a salt thereof is below the above range, it tends to be difficult to obtain dispersion stability with a small amount of addition.
- the weight average molecular weight of polyacrylic acid or a salt thereof exceeds the above range, the addition of the transition metal compound-supported titanium oxide may be promoted by addition.
- solvent (C) water, an organic solvent, or a mixed solvent thereof can be used.
- the organic solvent include methanol, ethanol, propanol, isopropyl alcohol, butanol, isobutyl alcohol, diacetone alcohol, furfuryl alcohol, ethylene glycol, propylene glycol, 1,3-propanediol, 1,4-butanediol, Alcohols such as 1,6-hexanediol and glycerin; esters such as methyl acetate, ethyl acetate, propyl acetate, isopropyl acetate, butyl acetate, ethylene glycol methyl ether acetate, propylene glycol methyl ether acetate; diethyl ether, diisopropyl ether, dibutyl ether , Ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, ethylene glycol monobutyl
- Titanium peroxide is considered to be a binuclear complex represented by the following formula. Ti 2 O 5 (OH) x (2-x) (Wherein x represents an integer of 1 to 6)
- Titanium peroxide can be synthesized, for example, by adding hydrogen peroxide to an aqueous solution of a titanium compound such as TiCl 4 in the presence of a basic substance (eg, ammonia water, sodium hydroxide, etc.).
- a basic substance eg, ammonia water, sodium hydroxide, etc.
- silicon compounds include tetrabromosilane, tetrachlorosilane, tribromosilane, trichlorosilane, dibromosilane, dichlorosilane, monobromosilane, monochlorosilane, dichlorodimethylsilane, dichlorodiethylsilane, dichloromethylsilane, and dichloroethylsilane.
- Halogenated silane compounds such as chlorotrimethylsilane, chlorotriethylsilane, chlorodimethylsilane, chlorodiethylsilane, chloromethylsilane, chloroethylsilane, t-butylchlorodimethylsilane, t-butylchlorodiethylsilane; tetramethoxysilane, tetra Ethoxysilane, trimethoxysilane, triethoxysilane, dimethoxysilane, diethoxysilane, methoxysilane, ethoxysilane, dimethoxymethylsilane DEMS, dimethoxyethyl silane, diethoxy ethyl silane, methoxy dimethylsilane, ethoxy dimethyl silane, methoxy diethyl silane, can be mentioned alkoxysilane compounds such as ethoxy diethyl silane.
- fluorine resin examples include polytetrafluoroethylene, polyvinylidene fluoride, polyvinyl fluoride, polychlorotrifluoroethylene, tetrafluoroethylene-hexafluoropropylene copolymer, ethylene-tetrafluoroethylene copolymer, and ethylene-chlorotrifluoroethylene copolymer.
- the binder component at least titanium peroxide is preferably used, and the proportion of titanium peroxide in the total amount of the binder component (D) is preferably 10% by weight or more, more preferably 20% by weight or more. It is preferably 30% by weight or more, particularly preferably 50% by weight or more, and most preferably 75% by weight or more.
- Titanium peroxide may be used alone or in combination with titanium peroxide and a silicon-based compound or fluorine-based resin. Titanium peroxide has high film-forming properties, and can be rapidly formed by coating and drying, and can be decomposed by the photocatalytic action of titanium oxide particles. Therefore, it is excellent in durability, and the titanium oxide particles can be fixed to the surface of the base material (object to be coated) over a long period of time.
- the titanium oxide dispersion of the present invention contains transition metal compound-supported titanium oxide particles (A), a dispersant (B) made of polyacrylic acid or a salt thereof, and a solvent (C).
- the amount of the dispersant (B) made of polyacrylate is, for example, 1 to 50 parts by weight with respect to 100 parts by weight of the transition metal compound-supported titanium oxide particles (A) in the dispersion.
- the amount is preferably 3 to 40 parts by weight, more preferably 5 to 30 parts by weight. If the amount of the dispersant (B) made of polyacrylate is too small, the dispersibility of titanium oxide tends to be lowered, and conversely if too large, aggregates of titanium oxide tend to be generated.
- the titanium oxide dispersion of the present invention may contain a dispersant other than the dispersant (B) made of polyacrylic acid or a salt thereof, but the total dispersant contained in the titanium oxide dispersion of the present invention
- the proportion of the dispersing agent (B) comprising polyacrylic acid or a salt thereof is 25% by weight or more, preferably 50% by weight or more, and particularly preferably 75% by weight or more.
- the total solid concentration in the titanium oxide dispersion can be appropriately selected, and is, for example, 0.1 to 50% by weight, preferably 0.2 to 40% by weight, and more preferably 1 to 30% by weight. Further, the content of the transition metal compound-supported titanium oxide particles (A) in the titanium oxide dispersion is, for example, 0.1 to 15% by weight, preferably 1 to 10% by weight.
- the method for preparing the titanium oxide dispersion is not particularly limited, and can be prepared by mixing the transition metal compound-supported titanium oxide particles (A), the dispersant (B), and the solvent (C).
- the order of addition of each component is not particularly limited.
- the dispersant (B) is added to the slurry solution containing the transition metal compound-supported titanium oxide particles (A) and the solvent (C), and the beads mill, jet mill, roll mill, hammer
- a titanium oxide dispersion can be prepared by mixing using a disperser (particularly a media stirring disperser) such as a mill, vibration mill, ball mill, sand mill, pearl mill, spike mill, agitator mill, or coball mill.
- the titanium oxide coating liquid of the present invention contains the above titanium oxide dispersion, and at least one binder component (D) selected from titanium peroxide, a silicon compound, and a fluorine resin.
- the blending ratio [former: latter (weight ratio)] of the transition metal compound-supported titanium oxide particles (A) and the binder component (D) is, for example, 1: 6 to 30: 1, preferably 1: 1 to 15: 1, particularly preferably 1.5: 1 to 13: 1.
- the photocatalytic activity tends to decrease, whereas when the blending amount of the transition metal compound-carrying titanium oxide particles (A) exceeds the above range.
- the adhesiveness to the base material (the body to be coated) and the deterioration preventing property of the base material (the body to be coated) are lowered.
- the total solid content concentration in the titanium oxide coating solution can be appropriately selected within a range not impairing the coating workability and the like, for example, 0.1 to 50% by weight, preferably 0.2 to 40% by weight, and more preferably 1 to 30%. % By weight.
- the content of the transition metal compound-supported titanium oxide particles (A) in the titanium oxide coating solution is, for example, 0.1 to 15% by weight, preferably 1 to 10% by weight.
- the method for preparing the titanium oxide coating solution is not particularly limited.
- the binder component (D) is added to the titanium oxide dispersion, and a bead mill, jet mill, roll mill, hammer mill, vibration mill, ball mill, sand mill, pearl mill, It can prepare by mixing using dispersers (especially media stirring type dispersers), such as a spike mill, an agitator mill, and a coball mill.
- dispersers especially media stirring type dispersers
- titanium oxide dispersion and binder component (D) In addition to the above-mentioned titanium oxide dispersion and binder component (D), other components (for example, components blended in ordinary photocatalyst paints such as coating aids) are appropriately added to the titanium oxide coating liquid of the present invention as necessary. Can be blended.
- the blending amount of the other components may be within a range not impairing the effects of the present invention, and is, for example, about 10% by weight or less (for example, 0.01 to 10% by weight) of the total amount of the titanium oxide coating solution.
- the photocatalyst coating film of the present invention is formed using the titanium oxide coating solution. Moreover, the photocatalyst coating body of this invention is provided with the said photocatalyst coating film on the surface of a base material (to-be-coated body).
- the photocatalyst coating film and the photocatalyst-coated body of the present invention are produced, for example, by applying the titanium oxide coating solution on the surface of a base material (at least one surface in the case of a sheet-like base material) and drying it. Can do.
- the base material constituting the photocatalyst-coated body of the present invention is not particularly limited, and various plastic materials [eg, polyethylene (PE), polypropylene (PP), ethylene-propylene copolymer, ethylene-acetic acid] Olefin resins containing ⁇ -olefin as monomer component such as vinyl copolymer (EVA); Polyester resins such as polyethylene terephthalate (PET), polyethylene naphthalate (PEN), polybutylene terephthalate (PBT); Polyvinyl chloride ( PVC); vinyl acetate resin; polyphenylene sulfide (PPS); polyamide resin such as polyamide (nylon), wholly aromatic polyamide (aramid); polyimide resin; polyether ether ketone (PEEK) etc.], rubber material (for example, , Natural rubber, synthetic rubber Silicon rubber, etc.), metal materials (eg, aluminum, copper, iron, stainless steel, etc.), paper materials (eg, paper, paper-like substances, etc.),
- the base material there are no particular restrictions on the base material from the viewpoint of use, for example, lenses (for example, glasses and camera lenses), prisms, vehicle members such as automobiles and railway vehicles (window glass, lamp covers, rearview mirrors, etc.) ), Building materials (eg, outer wall materials, inner wall materials, window frames, window glass, etc.), machine components, various display devices such as traffic signs, advertising towers, sound insulation walls (for roads, railways, etc.), bridges, guard rails Tunnel, insulator, solar battery cover, solar water heater heat collection cover, lighting fixture, bathroom article, bathroom member (eg, mirror, bathtub, etc.), kitchen article, kitchen member (eg, kitchen panel, sink, range hood, For attachment to antibacterial / antifungal, deodorizing, air purification, water purification, antifouling effects such as ventilation fans, air conditioners, toilet articles, toilet members (eg toilets), etc. Mention may be made of films, sheets, seals and the like.
- Application of the titanium oxide coating solution to the substrate can be performed by, for example, spraying, brushing, roller, gravure printing, or the like.
- a coating film can be formed quickly by drying (evaporating the solvent). As a drying method, it may be dried at room temperature or may be dried by heating.
- the coating amount of the titanium oxide coating solution is such that the content of the transition metal compound-supported titanium oxide particles (A) is, for example, 0.1 g / m 2 or more (preferably 0.1 to 5.0 g / m 2 , particularly preferably 0). .1 to 3.0 g / m 2 ).
- the coating amount of the titanium oxide coating solution is less than the above range, the photocatalytic ability tends to decrease.
- the titanium oxide coating solution may be applied directly to the surface of the base material, and an undercoat layer is provided on the surface of the base material in advance by applying a coating agent containing a binder component (particularly titanium peroxide), on which titanium oxide is provided.
- a coating solution may be applied.
- the base material and the photocatalyst coating film are completely separated by the undercoat layer, so even if a base material made of an organic material is used as the base material, the photocatalytic action is completely blocked, Can be protected from damage.
- the thickness thereof is, for example, 0.01 to 5.0 ⁇ m, preferably 0.1 to 2.0 ⁇ m.
- the photocatalyst coating film and the photocatalyst-coated body thus formed can exhibit a high photocatalytic activity, and can decompose harmful chemical substances into water and carbon dioxide by irradiation with light. Therefore, it can be used for various applications such as antibacterial / mold prevention, deodorization, air purification, water purification, and antifouling.
- titanium oxide particles are used, it has responsiveness over a wide wavelength range from the ultraviolet range to the visible light range, and absorbs light in normal living spaces such as sunlight, incandescent lamps, fluorescent lamps, etc., and has high catalytic activity It exhibits high gas decomposition performance and antibacterial action even in low-light environments such as indoors, cleans the environment in homes, hospitals, schools, and other public facilities, home appliances It can be applied to a wide range of functions such as
- Preparation Example 1 (Preparation of crude titanium oxide aqueous dispersion) At room temperature (25 ° C.), titanium tetrachloride aqueous solution (Ti concentration: 16.5 wt% ⁇ 0.5 wt%, chloride ion concentration: 31 wt% ⁇ 2 wt%, manufactured by Toho Titanium Co., Ltd.) Ti concentration was diluted with pure water so as to be 5.6% by weight.
- the diluted titanium tetrachloride aqueous solution 5650 g was placed in a 10 L tantalum-lined autoclave and sealed. Using a heat medium, the temperature inside the autoclave was raised to 140 ° C. over 2 hours.
- a portion of the resulting purified iron compound-supported titanium oxide aqueous dispersion was dried at 105 ° C. for 1 hour under normal pressure to obtain an iron compound-supported titanium oxide (specific surface area: 78 m 2 / g, average aspect ratio: 3). Obtained.
- the iron compound content in the obtained iron compound-supported titanium oxide was 830 ppm.
- the obtained iron compound-supported titanium oxide has (110) (111) (001) and a rod-shaped rutile type titanium oxide in which an iron compound is supported on the (111) surface, and (110) (111) (001). ) Surface, and a mixture of rod-shaped rutile type titanium oxide in which an iron compound is supported on the (001) (111) surface.
- Example 1 (Preparation of titanium oxide dispersion) To 200 g of the purified iron compound-supported titanium oxide aqueous dispersion (concentration of iron compound-supported titanium oxide: 10 wt%) obtained in Preparation Example 1, a sodium polyacrylate aqueous solution (trade name “Aron T-50”, solid content 43 10% by weight, weight average molecular weight of sodium polyacrylate: 6000, manufactured by Toagosei Co., Ltd., 190 g of ion-exchanged water, and a wet medium stirring mill (trade name “Ultra Apex Mill UAM-015”, manufactured by Kotobuki Kogyo Co., Ltd.) Thus, a titanium oxide sol (titanium oxide dispersion) having an iron compound-supported titanium oxide concentration of 5% by weight was obtained.
- a sodium polyacrylate aqueous solution trade name “Aron T-50”, solid content 43 10% by weight, weight average molecular weight of sodium polyacrylate: 6000, manufactured by Toagosei Co
- titanium oxide coating solution To this titanium oxide sol, 170 g of an aqueous solution of titanium peroxide as a binder (trade name “Tio Sky Coat C”, manufactured by Tio Techno Co., Ltd., titanium peroxide concentration: 1% by weight) was further added and mixed.
- the resulting titanium oxide coating solution (1) was applied onto a glass plate by a spray coating method so that the coating amount (dry weight) was 1.5 g / m 2 to obtain a photocatalyst coating film (1). (Thickness: 1 ⁇ m). The following evaluation test was done about the obtained photocatalyst coating film (1).
- VOC decomposition test By irradiating the photocatalyst coating film (1) with light, methyl mercaptan as VOC in the gas phase was decomposed, and the photocatalytic performance was evaluated from the amount of decomposition.
- Photocatalyst coating film (1) 5 cm ⁇ 10 cm is put in a reaction vessel (Tedlar bag, material: vinyl fluoride resin), 1 L of 70 ppm methyl mercaptan gas is blown into the reaction vessel, and light is irradiated at room temperature (25 ° C.) (fluorescence) Light 1000 lux).
- the remaining amount of methyl mercaptan in the reaction vessel 24 hours after the start of light irradiation was measured using a gas chromatograph with a flame photometric detector (trade name “GC-2010”, manufactured by Shimadzu Corporation), and the difference from the initial concentration
- the amount of decomposition (%) was calculated from As a result, the degradation amount (%) of methyl mercaptan after 24 hours was 100%.
- the surface hardness of the photocatalyst coating film (1) was evaluated using a pencil hardness meter (manufactured by Nippon Rigaku Corporation). The evaluation criteria were in accordance with JIS 5600-5-4. As a result, the pencil hardness was HB.
- Example 2 (Preparation of titanium oxide coating solution) At room temperature (25 ° C.), 500 g of the purified iron compound-supported titanium oxide aqueous dispersion (concentration of iron compound-supported titanium oxide: 10% by weight) obtained in Preparation Example 1 was added to a sodium polyacrylate aqueous solution (trade name “Nopcos Perth”). 44C ", solid content 40% by weight, manufactured by San Nopco Co., Ltd.) 5.87 g, and dispersed using a wet medium stirring mill (trade name” Ultra Apex Mill UAM-015 "manufactured by Kotobuki Kogyo Co., Ltd.) A titanium oxide sol having a supported titanium oxide concentration of 9.9% by weight was obtained.
- the resulting titanium oxide coating solution (2) was applied onto a glass plate by a spray coating method so that the coating amount (dry weight) was 1.5 g / m 2 to obtain a photocatalyst coating film (2). (Thickness: 1 ⁇ m). The following evaluation test was done about the obtained photocatalyst coating film (2).
- VOC decomposition test The photocatalyst coating film (2) was irradiated with light to decompose acetaldehyde, which is VOC in the gas phase, and the photocatalytic performance was evaluated from the amount of decomposition.
- Photocatalyst coating film (2) 5 cm ⁇ 10 cm is put in a reaction container (smart bag, material: vinylidene fluoride resin), 1 L of 16 ppm acetaldehyde gas is blown into the reaction container, and light is irradiated at room temperature (25 ° C.) (fluorescence) Lamp 6000 lux).
- the remaining amount of acetaldehyde in the reaction vessel 24 hours after the start of light irradiation was measured using a gas chromatograph with a flame ionization detector (trade name “GC-14B”, manufactured by Shimadzu Corporation). The amount of degradation (%) was calculated. As a result, the decomposition amount (%) of acetaldehyde after 24 hours was 100%.
- Comparative Example 1 200 g of ion-exchanged water was added to 200 g of the purified iron compound-supported titanium oxide aqueous dispersion (concentration of iron compound-supported titanium oxide: 10% by weight) obtained in Preparation Example 1, and a wet medium stirring mill (trade name “Ultra Apex Mill”) was added.
- UAM-015 (manufactured by Kotobuki Kogyo Co., Ltd.) was used to obtain a titanium oxide sol having an iron compound-supported titanium oxide concentration of 5 wt%.
- titanium oxide sol 170 g of an aqueous solution of titanium peroxide as a binder (trade name “Tio Sky Coat C”, manufactured by Tio Techno Co., Ltd., titanium peroxide concentration: 1% by weight) was further added and mixed.
- the titanium oxide dispersion of the present invention can be easily prepared in the vicinity of room temperature and close to neutrality without being dissolved in a large amount of hydrogen peroxide at a high temperature, has excellent dispersion stability, and is long. A highly dispersed state can be maintained over a period of time. Further, the standby time until the titanium oxide photocatalyst decomposes the dispersant and the original photocatalytic performance is exhibited can be shortened, and the immediate effect of the photocatalytic performance can be ensured. Moreover, the titanium oxide coating liquid of the present invention containing the titanium oxide dispersion liquid can be prepared in a region close to neutrality and is excellent in versatility. Moreover, the dispersibility and dispersion stability are high, and the coating property is excellent.
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Abstract
Description
(1)自動車の排気ガス等から排出される窒素酸化物(NOx)や硫黄酸化物(SOx)等の環境汚染物質を分解することによる大気浄化
(2)アンモニア、アセトアルデヒド、硫化水素、メチルメルカプタン等の悪臭物質を分解することによる脱臭
(3)テトラクロロエチレンやトリハロメタン等の有機塩素化合物を分解することによる浄水
(4)殺菌し、更にその死骸を分解することによる抗菌
(5)油分を分解することにより、油分に砂や垢が付着して生じる汚れを防止する防汚
本発明の他の目的は、多量の過酸化水素水に高温で溶解させる必要がなく、簡易な操作で調製でき、コストを低減できるとともに、分散性、分散安定性及び塗工性に優れた酸化チタン塗布液を提供することにある。
本発明の更に他の目的は、中性に近い領域で調製できるとともに、分散性、分散安定性及び塗工性に優れた酸化チタン塗布液を提供することにある。
本発明の更に他の目的は、前記酸化チタン塗布液を用いて形成された光触媒塗膜、及び基材表面に前記光触媒塗膜が設けられた光触媒塗装体を提供することにある。
(1) 遷移金属化合物担持酸化チタン粒子(A)、ポリアクリル酸又はその塩からなる分散剤(B)、及び溶媒(C)を含む酸化チタン分散液。
(2) 分散剤(B)におけるポリアクリル酸又はその塩がポリアクリル酸アルカリ金属塩である(1)に記載の酸化チタン分散液。
(3) 分散剤(B)におけるポリアクリル酸又はその塩の重量平均分子量が1000~100000の範囲内である(1)又は(2)に記載の酸化チタン分散液。
(4) 遷移金属化合物担持酸化チタン粒子(A)が、鉄化合物担持酸化チタン粒子である(1)~(3)の何れか1つに記載の酸化チタン分散液。
(5) 遷移金属化合物担持酸化チタン粒子(A)が、酸化チタン粒子の酸化反応面に遷移金属化合物を担持する粒子である(1)~(4)の何れか1つに記載の酸化チタン分散液。
(6) 遷移金属化合物担持酸化チタン粒子(A)における酸化チタン粒子が、ルチル型酸化チタン粒子である(1)~(5)の何れか1つに記載の酸化チタン分散液。
(7) 遷移金属化合物担持酸化チタン粒子(A)が、(110)(111)面を有し、前記(111)面に鉄化合物が担持されたルチル型酸化チタン、及び/又は(110)(111)(001)面を有し、及び前記(001)(111)面に鉄化合物が担持されたルチル型酸化チタン粒子である(1)~(6)の何れか1つに記載の酸化チタン分散液。
(8) (1)~(7)の何れか1つに記載の酸化チタン分散液と、過酸化チタン、ケイ素系化合物、及びフッ素系樹脂から選択される少なくとも1種のバインダー成分(D)を含む酸化チタン塗布液。
(9) バインダー成分(D)が過酸化チタンを少なくとも含有する(8)記載の酸化チタン塗布液。
(10) (8)又は(9)に記載の酸化チタン塗布液を用いて形成された光触媒塗膜。
(11) 基材の表面に(10)記載の光触媒塗膜が設けられた光触媒塗装体。
本発明では、光触媒として遷移金属化合物担持酸化チタン粒子(A)を用いる。このため、本発明の酸化チタン塗布液を用いて形成された光触媒塗膜は、紫外線域から可視光線域までの広い波長範囲に応答性を有し、太陽光や白熱灯、蛍光灯等の通常の生活空間における光源下でも高い触媒活性を発揮する。
Ti(OR)tX4-t (1)
(式中、Rは炭化水素基を示し、Xはハロゲン原子を示す。tは0~3の整数を示す)
<サンプル調製方法>
1.少量(耳かきサイズのスパチュラで半分程度)の酸化チタン粒子を9mLのガラス製サンプル瓶に入れ、エタノールを7mL入れ、超音波洗浄器にて超音波を5分間かけてエタノール中に分散させエタノール分散液を得る。
2.得られたエタノール分散液をガラス製スポイドで1滴取り、SEM用試料台の上に落として自然乾燥させた後、30秒間白金蒸着を行う。
<測定方法>
電界放出型走査電子顕微鏡(商品名「FE-SEM JSM-6700F」、日本電子(株)製、加速電圧:15kV、WD:約3mm、倍率:20万倍)を使用して結晶粒子をランダムに観察し、代表的な3カ所を抽出し、抽出されたSEM写真全体の中で、見た目に極端に大きく又は小さくなく、平均的な大きさの粒子を中心に輪郭がはっきりしている粒子30個を抽出してOHPシートに写し、それらの粒子について、画像解析ソフトウェア(商品名「WinROOF Version5.6」、三谷商事(株)製)を用いて各短径(最大長径に直交する幅)を求め、それらの値を平均して平均短径とした。また、同様の方法で平均長径(最大長径)を求め、これらの比(平均長径/平均短径)を平均アスペクト比とした。
本発明では、分散剤として、ポリアクリル酸又はその塩を用いる。ポリアクリル酸、ポリアクリル酸塩は水に溶解するので、簡易な操作で容易に酸化チタン分散液や酸化チタン塗布液を調製することができる。また、ポリアクリル酸又はその塩(特に、ポリアクリル酸塩)の水溶液は中性に近いので、これを含む酸化チタン分散液や酸化チタン塗布液は使用用途が限定されず、汎用性に優れる。さらに、ポリアクリル酸又はその塩は、カルボキシル基又はその塩(-COOM;Mは水素原子、金属原子、アンモニウムイオン等)1個当たりの分子量が小さく、酸化チタン粒子の分散に必要な添加量を少なくすることができる。そのため、酸化チタン塗布液から形成される光触媒塗膜中の有機基の量(濃度)を低減でき、光触媒が分散剤を分解して本来の光触媒性能が発現するまでの待機時間を短くできる。すなわち、光触媒性能の即効性を担保できる。また、該分散剤の分解によるアセトアルデヒド等のVOC(=揮発性有機化合物)の発生量を低減できるので、臭気の発生を抑制できる。さらに、分散剤としてポリアクリル酸又はその塩を使用する酸化チタン塗布液から形成される光触媒塗膜は高い硬度を有するので、塗膜に傷が付きにくい利点がある。
溶媒(C)としては、水、有機溶媒、又はこれらの混合溶媒を使用できる。前記有機溶媒としては、例えば、メタノール、エタノール、プロパノール、イソプロピルアルコール、ブタノール、イソブチルアルコール、ジアセトンアルコール、フルフリルアルコール、エチレングリコール、プロピレングリコール、1,3-プロパンジオール、1,4-ブタンジオール、1,6-ヘキサンジオール、グリセリンなどのアルコール;酢酸メチル、酢酸エチル、酢酸プロピル、酢酸イソプロピル、酢酸ブチル、エチレングリコールメチルエーテルアセテート、プロピレングリコールメチルエーテルアセテートなどのエステル;ジエチルエーテル、ジイソプロピルエーテル、ジブチルエーテル、エチレングリコールモノメチルエーテル、エチレングリコールモノエチルエーテル、エチレングリコールモノブチルエーテル、ジエチレングリコールモノエチルエーテル、プロピレングリコールモノメチルエーテル、テトラヒドロフラン、ジオキサンなどの鎖状又は環状エーテル;アセトン、メチルエチルケトン、アセチルアセトン、アセト酢酸エチルなどのケトンなどが挙げられる。有機溶媒は1種単独で用いてもよく、2種以上を併用してもよい。
本発明におけるバインダー成分(D)は、上記酸化チタン粒子を基材(被塗装体)に固定する働きを有するものであり、過酸化チタン(=ペルオキソチタン酸)、ケイ素系化合物、フッ素系樹脂から選択される少なくとも1種を使用することができる。
Ti2O5(OH)x (2-x)
(式中、xは1~6の整数を示す)
本発明の酸化チタン分散液は、遷移金属化合物担持酸化チタン粒子(A)、ポリアクリル酸又はその塩からなる分散剤(B)、及び溶媒(C)を含む。
本発明の酸化チタン塗布液は、上記酸化チタン分散液と、過酸化チタン、ケイ素系化合物、及びフッ素系樹脂から選択される少なくとも1種のバインダー成分(D)を含む。
本発明の光触媒塗膜は前記酸化チタン塗布液を用いて形成される。また、本発明の光触媒塗装体は、基材(被塗装体)の表面に前記光触媒塗膜が設けられている。本発明の光触媒塗膜及び光触媒塗装体は、例えば、基材の表面(シート状の基材の場合は、少なくとも一方の表面)に前記酸化チタン塗布液を塗布し、乾燥することにより製造することができる。
(粗酸化チタン水分散液の調製)
室温(25℃)にて、四塩化チタン水溶液(Ti濃度:16.5重量%±0.5重量%、塩素イオン濃度:31重量%±2重量%、東邦チタニウム(株)製)をTi濃度が5.6重量%になるように純水で希釈した。希釈後の四塩化チタン水溶液5650gを容量10Lのタンタルライニングのオートクレーブに入れ密閉した。熱媒を用い、2時間かけて上記オートクレーブ内温度を140℃まで昇温した。その後、撹拌しつつ、温度:140℃、圧力:その温度における蒸気圧の条件下で10時間保持した後、熱媒を冷却することによりオートクレーブを冷却した。オートクレーブ内温度が40℃以下になったことを確認して、粗酸化チタン水分散液5650gを取り出した。
得られた粗酸化チタン水分散液を、中空糸型限外濾過膜(商品名「FS03-FC-FUS03C1」、材質:PES、公称分画分子量:3万、ダイセン・メンブレン・システムズ(株)製)を用い、室温(25℃)、濾過圧力0.02MPaにて、透過液量と同量の純水を加えながらクロスフロー方式による濾過処理を行うことにより、酸化チタン水分散液を得た。酸化チタン水分散液の一部を常圧下、105℃で1時間乾燥したところ、(110)(111)面を有する棒状ルチル型酸化チタンと、(110)(111)(001)面を有する棒状ルチル型酸化チタンの混合物であった。
上記で得られた酸化チタン水分散液に塩化鉄水溶液(35重量%)7.5gを添加し、室温(25℃)にて30分撹拌した。その後、メタノール95g(酸化チタン水分散液の1.7重量%)を添加し、100Wの高圧水銀ランプを用いて紫外線(UV)を3時間照射して(UV照射量:5mW/cm2)、粗鉄化合物担持酸化チタン水分散液を得た。
粗鉄化合物担持酸化チタン水分散液を、中空糸型限外濾過膜(商品名「FS03-FC-FUS03C1」、材質:PES、公称分画分子量:3万、ダイセン・メンブレン・システムズ(株)製)を用い、室温(25℃)、濾過圧力0.02MPaにて、透過液量と同量の純水を加えながらクロスフロー方式による濾過処理を行い、精製鉄化合物担持酸化チタン水分散液を得た。
(酸化チタン分散液の調製)
調製例1で得られた精製鉄化合物担持酸化チタン水分散液(鉄化合物担持酸化チタンの濃度:10重量%)200gに、ポリアクリル酸ナトリウム水溶液(商品名「アロンT-50」、固形分43重量%、ポリアクリル酸ナトリウムの重量平均分子量:6000、東亞合成社製)10g、イオン交換水190gを加え、湿式媒体撹拌ミル(商品名「ウルトラアペックスミル UAM-015」、寿工業社製)を用いて分散させ、鉄化合物担持酸化チタン濃度5重量%の酸化チタンゾル(酸化チタン分散液)を得た。
この酸化チタンゾルに、さらに、バインダーとしての過酸化チタンの水溶液(商品名「ティオスカイコートC」、(株)ティオテクノ製、過酸化チタン濃度:1重量%)170gを加えて混合し、酸化チタン塗布液(1)(光触媒塗布液)[鉄化合物担持酸化チタン/過酸化チタン(重量比)=12/1]を調製した。
スプレーコート法により、得られた酸化チタン塗布液(1)をガラス板上に塗布量(乾燥重量)が1.5g/m2になるように塗布して、光触媒塗膜(1)を得た(膜厚:1μm)。得られた光触媒塗膜(1)について、以下の評価試験を行った。
光触媒塗膜(1)に光照射することで気相中のVOCであるメチルメルカプタンを分解させ、その分解量から光触媒性能を評価した。
光触媒塗膜(1)5cm×10cmを反応容器(テドラーバッグ、材質:フッ化ビニル樹脂)の中に入れ、70ppmのメチルメルカプタンガス1Lを反応容器内に吹き込み、室温(25℃)で光照射(蛍光灯1000ルクス)を行った。光照射開始から24時間後の反応容器中のメチルメルカプタン残量を炎光光度検出器付きガスクロマトグラフ(商品名「GC-2010」、島津製作所製)を使用して測定し、初期濃度との差から分解量(%)を算出した。その結果、メチルメルカプタンの24時間後の分解量(%)は100%であった。
光触媒塗膜(1)の表面硬度を鉛筆硬度計(日本理学工業製)を用いて評価した。評価基準は、JIS5600-5-4に従った。その結果、鉛筆硬度HBであった。
光触媒塗膜(1)のガラス板との密着性をクロスカット法により評価した。評価基準は、JIS5600-5-6に従った。その結果、剥がれはほとんど見られなかった(JIS5600-5-6における分類0に相当)。
光触媒塗膜(1)の透明性をヘーズメーター(商品名「NDH5000W」、日本電色工業製)を用いて、曇り度(ヘーズ)、全光線透過率値により評価した。その結果、曇り度が43%、全光線透過率は84%であった。
(酸化チタン塗布液の調製)
室温(25℃)にて、調製例1で得られた精製鉄化合物担持酸化チタン水分散液(鉄化合物担持酸化チタンの濃度:10重量%)500gに、ポリアクリル酸ナトリウム水溶液(商品名「ノプコスパース44C」、固形分40重量%、サンノプコ(株)製)5.87gを加え、湿式媒体撹拌ミル(商品名「ウルトラアペックスミル UAM-015」、寿工業社製)を用いて分散させ、鉄化合物担持酸化チタン濃度9.9重量%の酸化チタンゾルを得た。この酸化チタンゾルに、さらに、イオン交換水14.4g、バインダーとしての過酸化チタンの水溶液(商品名「ティオスカイコートC」、(株)ティオテクノ製、過酸化チタン濃度:1重量%)8.5gを加えて混合し、酸化チタン塗布液(2)(光触媒塗布液)[鉄化合物担持酸化チタン/過酸化チタン(重量比)=8/1]を調製した。
スプレーコート法により、得られた酸化チタン塗布液(2)をガラス板上に塗布量(乾燥重量)が1.5g/m2になるように塗布して、光触媒塗膜(2)を得た(膜厚:1μm)。得られた光触媒塗膜(2)について、以下の評価試験を行った。
光触媒塗膜(2)に光照射することで気相中のVOCであるアセトアルデヒドを分解させ、その分解量から光触媒性能を評価した。
光触媒塗膜(2)5cm×10cmを反応容器(スマートバッグ、材質:フッ化ビニリデン樹脂)の中に入れ、16ppmのアセトアルデヒドガス1Lを反応容器内に吹き込み、室温(25℃)で光照射(蛍光灯6000ルクス)を行った。光照射開始から24時間後の反応容器中のアセトアルデヒド残量を水素炎イオン化検出器付きガスクロマトグラフ(商品名「GC-14B」、島津製作所製)を使用して測定し、初期濃度との差から分解量(%)を算出した。その結果、アセトアルデヒドの24時間後の分解量(%)は100%であった。
調製例1で得られた精製鉄化合物担持酸化チタン水分散液(鉄化合物担持酸化チタンの濃度:10重量%)200gに、イオン交換水200gを加え、湿式媒体撹拌ミル(商品名「ウルトラアペックスミル UAM-015」、寿工業社製)を用いて分散させ、鉄化合物担持酸化チタン濃度5重量%の酸化チタンゾルを得た。この酸化チタンゾルに、さらに、バインダーとしての過酸化チタンの水溶液(商品名「ティオスカイコートC」、(株)ティオテクノ製、過酸化チタン濃度:1重量%)170gを加えて混合し、酸化チタン塗布液(3)(光触媒塗布液)[鉄化合物担持酸化チタン/過酸化チタン(重量比)=12/1]を調製した。しかし、しばらくすると、鉄化合物担持酸化チタン粒子同士が凝集した凝集物が見られるとともに、透明性も低下した。
Claims (10)
- 遷移金属化合物担持酸化チタン粒子(A)、ポリアクリル酸又はその塩からなる分散剤(B)、及び溶媒(C)を含む酸化チタン分散液。
- 分散剤(B)におけるポリアクリル酸又はその塩がポリアクリル酸アルカリ金属塩である請求項1に記載の酸化チタン分散液。
- 分散剤(B)におけるポリアクリル酸又はその塩の重量平均分子量が1000~100000の範囲内である請求項1又は2に記載の酸化チタン分散液。
- 遷移金属化合物担持酸化チタン粒子(A)が、鉄化合物担持酸化チタン粒子である請求項1~3の何れか1項に記載の酸化チタン分散液。
- 遷移金属化合物担持酸化チタン粒子(A)が、酸化チタン粒子の酸化反応面に遷移金属化合物を担持する粒子である請求項1~4の何れか1項に記載の酸化チタン分散液。
- 遷移金属化合物担持酸化チタン粒子(A)における酸化チタン粒子が、ルチル型酸化チタン粒子である請求項1~5の何れか1項に記載の酸化チタン分散液。
- 請求項1~6の何れか1項に記載の酸化チタン分散液と、過酸化チタン、ケイ素系化合物、及びフッ素系樹脂から選択される少なくとも1種のバインダー成分(D)を含む酸化チタン塗布液。
- バインダー成分(D)が過酸化チタンを少なくとも含有する請求項7記載の酸化チタン塗布液。
- 請求項7又は8に記載の酸化チタン塗布液を用いて形成された光触媒塗膜。
- 基材の表面に請求項9記載の光触媒塗膜が設けられた光触媒塗装体。
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| JP7263744B2 (ja) | 2018-11-28 | 2023-04-25 | 東洋インキScホールディングス株式会社 | 顔料分散体、およびインクジェット用インク |
| JP2021154233A (ja) * | 2020-03-27 | 2021-10-07 | 大阪瓦斯株式会社 | 金属ナノ粒子担持チタニアナノ粒子及びそれを用いた光触媒 |
| JP7539780B2 (ja) | 2020-03-27 | 2024-08-26 | 大阪瓦斯株式会社 | 金属ナノ粒子担持チタニアナノ粒子及びそれを用いた光触媒 |
| JP2022031077A (ja) * | 2020-08-06 | 2022-02-18 | Fkk株式会社 | 照明装置、便器および便座装置 |
| JP2022155211A (ja) * | 2021-03-30 | 2022-10-13 | 大阪瓦斯株式会社 | 金属担持チタニアナノ粒子及びその製造方法 |
| JP7657637B2 (ja) | 2021-03-30 | 2025-04-07 | 大阪瓦斯株式会社 | 金属担持チタニアナノ粒子及びその製造方法 |
| CN113231106A (zh) * | 2021-05-11 | 2021-08-10 | 浙江理工大学 | 一种将二氧化钛纳米花负载于涤纶纤维上的制备方法 |
| WO2024106401A1 (ja) * | 2022-11-16 | 2024-05-23 | 日揮触媒化成株式会社 | 酸化チタン粒子、分散液、塗膜形成用塗布液、塗膜および塗膜付基材 |
Also Published As
| Publication number | Publication date |
|---|---|
| JPWO2014141992A1 (ja) | 2017-02-16 |
| TW201442780A (zh) | 2014-11-16 |
| US9440221B2 (en) | 2016-09-13 |
| KR102180235B1 (ko) | 2020-11-18 |
| KR20150126842A (ko) | 2015-11-13 |
| EP2974793A4 (en) | 2016-11-30 |
| TWI617350B (zh) | 2018-03-11 |
| EP2974793A1 (en) | 2016-01-20 |
| US20160001266A1 (en) | 2016-01-07 |
| JP6231550B2 (ja) | 2017-11-15 |
| CN105073258A (zh) | 2015-11-18 |
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