Method for producing deodorizing material

Abstract

To provide a method for producing a deodorant material hardly causing color fading.SOLUTION: A method for producing a deodorizing material, the method comprising coating at least a part of a substrate (A) with a coating liquid containing a binder emulsion (B), an odor removal catalyst (C) in which one or more metal elements of Groups 8 to 12 are supported on a porous carrier, and a surfactant (D), A drying step (A) and a drying step (B) are performed after the coating liquid is applied, and the drying step (A) and the drying step (B) satisfy the following formula (1): drying temperature (°C.) in drying step (A) * drying time (min) in drying step (A) * 0.7 + drying temperature (°C.) in drying step (B) * drying time (min) in drying step (B) <1500 (1). m2 07g.SELECTED DRAWING: None

Description

[Technical Field]

[0001] The present invention relates to a method for producing a deodorizing material. [Background technology]

[0002] Various odors generated in the environment (exhaust gas, garbage and food odors, odors emitted from newly constructed homes and buildings, etc.) are major social issues, and effective countermeasures are needed for each environment. Odors are particularly problematic in enclosed spaces such as homes, hotels, restaurants, and other public facilities, as well as in transportation facilities such as trains and automobiles. However, since people coexist in these spaces, installing specialized equipment (e.g., ozone deodorizers or hypochlorous acid deodorizers) poses safety concerns, and easy-to-use adsorbents are therefore preferred. However, continued use of adsorbents can exceed their adsorption capacity and lead to breakthrough, requiring frequent replacement. Furthermore, particularly on hot days, odorous components once adsorbed can desorb, resulting in foul odors.

[0003] For this reason, there is a demand for a deodorizing material that can quickly adsorb and eliminate odors in closed spaces, and that can reduce odors sustainably over a long period of time without causing odor recurrence. A deodorizing material that can reduce odors sustainably over a long period of time is desired to not only adsorb and eliminate odors but also decompose the adsorbed odors.

[0004] As a technology for adsorbing and decomposing odorous components in the air, photocatalysts and Pt-supported silica catalysts are known to be effective in decomposing volatile organic compounds (VOCs) in the air. Patent Document 1 teaches that a catalyst comprising a platinum-ruthenium complex supported on porous silica can oxidatively decompose ethylene or mercaptan compounds. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] International Publication No. 2019 / 027057 Summary of the Invention [Problem to be solved by the invention]

[0006] However, the above-mentioned deodorizing materials have a problem in that they are prone to discoloration depending on the type and color of the substrate. One object of the present invention is to provide a method for producing a deodorizing material that is resistant to fading. [Means for solving the problem]

[0007] As a result of extensive research aimed at solving the above problems, the present inventors have found that the above problems can be solved by the following embodiments, and have completed the present invention.

[0008] [1] At least a part of the substrate (A), Binder emulsion (B), An odor removal catalyst (C) in which one or more metal elements of Groups 8 to 12 are supported on a porous carrier, and Surfactant (D) A method for producing a deodorizing material, comprising applying a coating liquid containing The coating amount of surfactant (D) is 0.07 g / m 2 That's all, A method for producing a deodorizing material, comprising, after applying the coating liquid, a drying step (A) and a drying step (B), wherein the drying step (A) and the drying step (B) satisfy the following formula (1): Drying temperature (°C) of drying process (A) × drying time (min) of drying process (A) × 0.7 + drying temperature (°C) of drying process (B) × drying time (min) of drying process (B) < 1500 (1)

[0009] [2] The method for producing a deodorizing material according to item [1], wherein the drying step (A) and the drying step (B) are carried out in this order.

[0010] [3] The method for producing a deodorizing material according to item [1] or [2], wherein the drying temperature in the drying step (A) is 80 to 180°C and the drying time is 3 to 18 minutes, and the drying temperature in the drying step (B) is 140 to 180°C and the drying time is 0.3 to 7 minutes.

[0011] [4] The method for producing a deodorizing material according to any one of items [1] to [3], wherein the porous carrier of the odor removing catalyst (C) is MFI type zeolite.

[0012] [5] The method for producing a deodorizing material according to any one of items [1] to [4], wherein the metal element of the odor removing catalyst (C) is Pt.

[0013] [6] The method for producing a deodorizing material according to any one of items [1] to [5], wherein the binder emulsion (B) is an acrylic binder emulsion. [Effects of the Invention]

[0014] According to the present invention, a method for producing a deodorizing material that is resistant to fading can be provided. DETAILED DESCRIPTION OF THE INVENTION

[0015] The present invention will be described in detail below. <Deodorizing materials> The deodorizing material according to the present invention comprises a substrate (A) at least partially coated with a coating liquid containing a binder emulsion (B), an odor removing catalyst (C) and a surfactant (D).

[0016] <Base material (A)> The substrate (A) is not particularly limited as long as it can be coated with a coating liquid containing the binder emulsion (B), odor removal catalyst (C) and surfactant (D), and has the desired shape as a deodorizing material.

[0017] The material of the substrate (A) is not particularly limited, and may be any of an inorganic substrate, an organic substrate, and a composite substrate. The shape of the substrate (A) is not particularly limited, and any known shape can be used without restriction, such as fiber, thread, woven fabric, nonwoven fabric, string, plate, sphere, rod, particle, block, sheet, film, porous, amorphous, or a combination of these shapes. The size of the substrate (A) is not particularly limited as long as it can be coated with a coating liquid containing the binder emulsion (B), odor removal catalyst (C) and surfactant (D), and any substrate having a surface larger than the diameter of the odor removal catalyst (C) can be used without any restrictions.

[0018] The substrate (A) is preferably in the form of a fiber, thread, woven fabric, or nonwoven fabric, with woven fabric or nonwoven fabric being more suitable in terms of versatility as a material for various products. When the substrate (A) is in the form of a fiber, thread, woven fabric, or nonwoven fabric, the fiber diameter of the single fiber constituting the substrate is preferably 1 μm or more, more preferably 5 μm or more, and even more preferably about 10 to 50 μm, since this makes it easier to retain the odor removal catalyst (C). When the substrate (A) is in the form of a fiber, thread, woven fabric, or nonwoven fabric, it may be composed of fibers made from any of inorganic substrates, organic substrates, and composite substrates, and examples of fibers include glass wool, carbon fiber, natural fiber, synthetic fiber, and composite fiber.

[0019] As the synthetic fibers, fibers obtained from known resins can be used. Preferred resins include polyester, polyamide, acrylic, polyethylene, polypropylene, polyvinyl, polyvinylidene, polyurethane, and polystyrene. These resins may be homopolymers or copolymers. In the case of copolymers, the polymerization ratio of the monomers is not particularly limited.

[0020] <Binder emulsion (B)> The binder emulsion (B) is a form in which a binder resin component, which is a solid content, is dispersed in a dispersion medium. When the binders (B1) and (B2) described below are produced by polymerization, the obtained polymerization liquid containing the binders (B1) and (B2) may be used as the binder emulsion (B). The binder emulsion (B) may be used alone or in combination of two or more.

[0021] Examples of the dispersion medium for the binder emulsion (B) include water and organic solvents.

[0022] The binder emulsion (B) preferably contains a binder (B1) having a glass transition temperature (Tg) of 30° C. or lower as measured by differential scanning calorimetry (DSC).

[0023] The glass transition temperature (Tg) of the binder (B1) may be 30° C. or lower, and is preferably −50 to 30° C., more preferably −40 to 30° C., and even more preferably −30 to 30° C. Use of a binder (B1) having such a glass transition temperature allows for strong adhesion even without bonding under heat, enabling the odor removal catalyst (C) to be held on the substrate (A), preventing the odor removal catalyst (C) from falling off from the deodorizing material, and providing excellent resistance to contact and resistance to cleaning and washing (washability), which allows the deodorizing effect to be maintained for a long period of time, which is preferable.

[0024] The binder (B1) is not particularly limited, but it is desirable that the average particle size measured by a laser diffraction particle size distribution analyzer is preferably 40 to 140 nm, more preferably 60 to 130 nm, and even more preferably 80 to 130 nm. A binder (B1) having such an average particle size is preferred because it has excellent adhesive properties for bonding the particles of the odor removal catalyst (C) to the substrate (A).

[0025] Examples of the binder (B1) include resin binders having adhesive properties, such as acrylic binders, acrylic silicone binders, styrene binders, and acrylic styrene binders, which satisfy the above conditions. Of these, acrylic binders and styrene binders are preferred, and acrylic binders are more preferred. These binders (B1) may be used alone or in combination of two or more.

[0026] The binder emulsion (B) may contain, in addition to the above-mentioned binder (B1), a binder (B2) other than the binder (B1).

[0027] The binder (B2) may be any of the above-mentioned adhesive resin binders having a glass transition temperature of more than 30° C. Among these, acrylic binders and styrene binders are preferred, and acrylic binders are more preferred. These binders (B2) may be used alone or in combination of two or more.

[0028] The proportion of the binder (B2) in the binder emulsion (B) is preferably 70% by mass or less, more preferably 50% by mass or less, even more preferably 40% by mass or less, and particularly preferably 30% by mass or less, based on the total solid content. The lower limit of the content of the binder (B2) in the binder emulsion (B) is not particularly limited, but when the binder emulsion (B) contains the binder (B2), it is preferably 1% by mass, more preferably 5% by mass, and even more preferably 10% by mass.

[0029] The binder emulsion (B) contains binder (B1) and binder (B2) in a mass ratio [(B1):(B2)] of preferably 30:70 to 100:0, more preferably 40:60 to 100:0, and even more preferably 50:50 to 100:0. When binder emulsion (B) contains binder (B2), the mass ratio of binder (B1) to binder (B2) [(B1):(B2)] is preferably 30:70 to 99:1, more preferably 40:60 to 95:5, and even more preferably 50:50 to 90:10. Note that this mass ratio is the mass ratio of the solid content, which is the binder resin component, and does not include the dispersion medium or solvent, etc. When the content ratio of binder (B1) to binder (B2) in binder emulsion (B) is within the above range, the substrate (A) and odor removal catalyst (C) in the obtained deodorizing material are firmly adhered to each other, allowing the odor removal catalyst (C) to be held on the substrate (A), and preventing the odor removal catalyst (C) from falling off from the deodorizing material, which is preferable.

[0030] <Odor Removal Catalyst (C)> The odor removal catalyst (C) is formed by supporting on a porous carrier one or more metal elements of Groups 8 to 12. Such an odor removal catalyst (C) can adsorb and decompose odorous components in the air. The odor removing catalyst (C) may be used alone or in combination of two or more.

[0031] As the porous carrier, any porous carrier capable of supporting a metal component can be used, including organic carriers such as activated carbon and cellulose carriers, inorganic carriers such as metal oxide carriers and composite oxide carriers, composite carriers which are composites of these, etc. Among these, porous carriers capable of adsorbing odor components themselves, such as activated carbon, oxide carriers, and composite oxide carriers, are preferred, and oxide carriers or composite oxide carriers are more preferred in terms of the ease of obtaining porous carriers having the desired particle size and pore size.

[0032] Examples of oxide supports include alumina and porous silica. Examples of composite oxides include calcium titanate, aluminum silicate, and magnesium aluminate. Among these, zeolite (crystalline aluminosilicate) is preferred, and MFI zeolite is more preferred.

[0033] The average particle size of the porous carrier measured by a laser diffraction particle size distribution analyzer is preferably 0.01 to 50 μm, more preferably 0.03 to 30 μm, and even more preferably 0.05 to 20 μm. A porous carrier having such an average particle size is preferred because it can support a sufficient amount of metal component.

[0034] Examples of metal elements from Groups 8 to 12 supported on the porous carrier include one or more of Fe, Ru, Os, Co, Rh, Ir, Ni, Pd, Pt, Cu, Ag, Au, Zn, and Cd. These metal elements may be supported on the porous carrier in the form of simple metals, in the form of metal compounds such as oxides and chlorides, or in the form of composite oxides of two or more metal elements. An odor removal catalyst (C) in which one or more such metal elements are supported on a porous carrier can effectively adsorb and decompose odorous components in the air, thereby reducing and eliminating odors. This effect is thought to be achieved by the odor removal catalyst (C) quickly adsorbing odorous substances in the surrounding gas into the pores of the porous carrier and decomposing at least a portion of the adsorbed odorous substances by the supported metal components, thereby maintaining deodorizing performance for a long period of time.

[0035] The odor removal catalyst (C) is not particularly limited, but is preferably a porous carrier carrying one or more metal elements including Pt (platinum). When a metal element including Pt is supported on a porous carrier, the supported metal species may be Pt alone, or may be a combination of Pt and other metal elements from Groups 8 to 12. The proportion of Pt in the total supported metals (total of Pt and other metals) is preferably 10 mol% or more, more preferably 30 mol% or more, even more preferably 50 mol% or more, particularly preferably 70 mol% or more, and even more particularly preferably 90 mol% or more. An odor removal catalyst (C) carrying a metal element including Pt on a porous carrier is capable of decomposing various odorous substances such as aldehydes, carboxylic acids, and esters, has a high odorous substance decomposition effect, has a particularly long-lasting odor reduction effect, can deodorize efficiently, and is less likely to cause the problem of releasing odorous substances and diffusing the odor.

[0036] The odor removal catalyst (C) may be a commercially available product or a prepared product, as long as it is an odor removal catalyst in which one or more metal elements from Groups 8 to 12 are supported on a porous carrier and can adsorb and decompose odorous components in the air. The odor removal catalyst (C) can be prepared by any known method, such as impregnating a porous carrier with an aqueous solution containing a compound containing a metal element, and then drying and calcining the porous carrier as necessary.

[0037] The average particle size of the odor removal catalyst (C) is preferably 0.01 to 50 μm, more preferably 0.03 to 30 μm, even more preferably 0.05 to 20 μm, and particularly preferably 0.5 to 10 μm. The odor removal catalyst (C) particles may be in the form of single particles of a porous carrier carrying a metal component, or may be in the form of composite particles formed by agglomeration of multiple particles. Having an average particle size of the odor removal catalyst (C) within the above range is preferable in that the odor removal catalyst (C) maintains high deodorizing performance while exhibiting high dispersibility in the coating liquid and not affecting the appearance of the product after coating.

[0038] The mass ratio of the binder emulsion (B) to the odor removal catalyst (C) [(B):(C)] as solids is preferably 90:10 to 10:90, more preferably 80:20 to 20:80. Using a coating liquid containing the binder emulsion (B) and the odor removal catalyst (C) at such a mass ratio is preferable because the odor removal catalyst (C) is firmly held to the surface of the substrate (A) by the binder emulsion (B), and a deodorizing material can be obtained in which the performance of the odor removal catalyst (C) is not inhibited by the binder emulsion (B).

[0039] <Surfactant (D)> The surfactant (D) is not particularly limited, but examples thereof include sodium alkylbenzenesulfonate, sodium alkyloxybenzenesulfonate, sodium alkyl sulfates such as sodium lauryl sulfate, and acetylene glycol surfactants. The surfactant (D) may be used alone or in combination of two or more kinds.

[0040] The coating amount of surfactant (D) is 0.07 g / m 2 or more, preferably 0.07 to 1.0 g / m 2 , more preferably 0.07 to 0.8 g / m 2 , and more preferably 0.07 to 0.5 g / m 2 When the coating amount of the surfactant (D) is within the above range, the resulting deodorant material is less likely to fade and tends to have excellent hydrophilicity and flexibility, which is preferable.

[0041] <Other ingredients> The deodorizing material may be composed only of the substrate (A), binder emulsion (B), odor removal catalyst (C), and surfactant (D), but may also contain other components as long as the object of the present invention is not impaired. Examples of other components include dispersion media or solvents other than the dispersion media or solvent contained in the binder emulsion (B), thickeners, and other additives. The dispersion media or solvents may be removed by evaporation during the production stage of the deodorizing material or over time after production. Each of the other components may be used alone or in combination of two or more.

[0042] Examples of thickeners include polysaccharides such as sodium alginate, methyl cellulose, hydroxypropyl cellulose, and xanthan gum, polyvinyl alcohol, and polymethacrylic acid-based thickeners. Other additives include weathering agents, antioxidants, pigments, dyes, and inorganic fillers.

[0043] The deodorizing material of the present invention may contain other odor-removing components in addition to the odor-removing catalyst (C). Known odor-removing components can be used without limitation, including, for example, chemical adsorbents. When the deodorizing material of the present invention contains, in addition to the odor-removing catalyst (C), a chemical adsorbent that deodorizes through chemical interaction with odorous substances, the initial odor-reducing performance can be improved. Examples of chemical adsorbents include Toagosei's Kesmon NS-750 (organic amine-supported silica; for aldehydes), NS-70 (Ca, Mg-based compounds; for acids), NS-10 (zirconia phosphate; for ammonia), and NS-20C (Cu-based compound-supported silica; for sulfur compounds); Otsuka Chemical's Chemcatch (adipic acid dihydrazide; for aldehydes); and Sinanen Zeomic's Dashlight S (amine compound-supported silica; for aldehydes).

[0044] <Method of manufacturing deodorizing material> The deodorizing material can be produced by applying a coating liquid containing a binder emulsion (B), an odor removal catalyst (C), and a surfactant (D) to at least a portion of a substrate (A), followed by a drying step (A) and a drying step (B), wherein the drying step (A) and the drying step (B) satisfy the following formula (1): Drying temperature (°C) of drying process (A) × drying time (min) of drying process (A) × 0.7 + drying temperature (°C) of drying process (B) × drying time (min) of drying process (B) < 1500 (1)

[0045] The coating liquid can be prepared by sequentially or simultaneously mixing the binder emulsion (B), the odor removing catalyst (C), and the surfactant (D) by a known method. Specifically, the coating liquid can be prepared by thoroughly dispersing and mixing the raw material components using a general mixing device such as a ball mill, a roll mill, a disperser, or a mixer. The coating liquid is preferably in the form of an emulsion in which the odor removing catalyst is uniformly dispersed, as this is suitable for coating, and in the process of obtaining the coating liquid, a dispersion medium such as water and additives such as the above-mentioned thickeners may be added. Furthermore, if the target deodorizing material contains odor removing components other than the odor removing catalyst (C), these may be added to the coating liquid or may be used separately.

[0046] The coating liquid can be applied to the substrate (A) by immersion, spray coating, painting or other methods.

[0047] The drying step is a step of volatilizing and removing the dispersion medium or solvent contained in the applied coating liquid. The drying step can be performed, for example, by leaving the coated film to stand under heating, by hot air treatment, by reduced pressure treatment, or by a combination of these methods.

[0048] The drying step (A) and the drying step (B) satisfy the following formula (1), preferably the following formula (1'), and more preferably the following formula (1''). Drying temperature (°C) of drying process (A) × drying time (min) of drying process (A) × 0.7 + drying temperature (°C) of drying process (B) × drying time (min) of drying process (B) < 1500 (1) 200≦Drying temperature (℃) of drying process (A) × Drying time (minutes) of drying process (A) × 0.7 + Drying temperature (℃) of drying process (B) × Drying time (minutes) of drying process (B)≦1480 (1') 400≦Drying temperature (℃) of drying process (A) × Drying time (min) of drying process (A) × 0.7 + Drying temperature (℃) of drying process (B) × Drying time (min) of drying process (B)≦1460 (1'') When the drying steps (A) and (B) are within the above ranges, it is preferable in that a deodorizing material that is resistant to discoloration can be produced.

[0049] The drying temperature in the drying step (A) is preferably 80 to 200°C, more preferably 80 to 180°C, and even more preferably 90 to 170°C, and the drying time is preferably 1 to 20 minutes, more preferably 3 to 18 minutes, and even more preferably 3 to 16 minutes. If the drying temperature and drying time in the drying step (A) are within the above ranges, it is preferable because the obtained deodorant material is less likely to fade.

[0050] The drying temperature in the drying step (B) is preferably 100 to 200°C, more preferably 140 to 180°C, and even more preferably 150 to 170°C, and the drying time is preferably 0.1 to 10 minutes, more preferably 0.2 to 8 minutes, and more preferably 0.3 to 7 minutes. If the drying temperature and drying time in the drying step (B) are within the above ranges, it is preferable because the obtained deodorant material is less likely to fade.

[0051] The order of the drying step (A) and the drying step (B) is not particularly limited, but from the viewpoint of making the obtained deodorant material less susceptible to discoloration, it is preferable that the drying step (A) and the drying step (B) are carried out in this order. A removal step may be included between the drying step (A) and the drying step (B), and if the drying temperature in the drying step (A) and the drying step (B) is the same, the drying step (A) and the drying step (B) may be continuous.

[0052] <Application> The deodorizing material can be used as it is as a deodorizing product, or can be used as a material for various products that have a deodorizing effect. For example, the deodorizing material can be used as a material for various products to which the deodorizing material is applied, such as building materials such as wall materials, floor materials, ceiling materials, wallpaper, window frames, and tiles; interior materials such as curtains, mats, furniture, cushions, and small items; clothing such as underwear, socks, aprons, uniforms, surgical gowns, and nursing care clothing; bedding such as pillows, futons, futon covers, and sheets; interior materials for vehicles such as automobiles and trains; containers such as trash cans and food waste containers; and building materials and fixtures for facilities with high odor concentrations, such as waste incineration plants and fresh food processing plants. [Example]

[0053] The present invention will be explained in more detail below based on examples, but the present invention is not limited to these examples in any way.

[0054] <Base material> Base material (A-1): Black PET fabric (thickness 0.8 mm, basis weight 210 g / m 2 ) Base material (A-2): Brown PET fabric (thickness 0.8 mm, basis weight 180 g / m 2 )

[0055] [Manufacturing Example 1] <Binder emulsion (B)> A reaction vessel equipped with a stirrer, a reflux condenser, a dropping device, and a thermometer was charged with 670 parts by mass of ion-exchanged water and 1.8 parts by mass of sodium dodecyl diphenyl ether disulfonate, and the temperature was raised to 72°C while stirring and replacing with nitrogen. The internal temperature was maintained at 72°C, and 4.3 parts by mass of potassium persulfate was added as a polymerization initiator. After dissolution, an emulsion prepared in advance by adding 350 parts by mass of ion-exchanged water, 1.8 parts by mass of sodium dodecyl diphenyl ether disulfonate, 17.4 parts by mass of acrylamide, 17.4 parts by mass of itaconic acid, 17.4 parts by mass of 2-hydroxyethyl methacrylate, 163 parts by mass of methyl methacrylate, 553 parts by mass of n-butyl acrylate, 87 parts by mass of ethyl acrylate, and 17.4 parts by mass of divinylbenzene under stirring was continuously added dropwise to the reaction solution over 5 hours. After the dropwise addition was completed, the emulsion was aged for 6 hours. The resulting aqueous emulsion was cooled to room temperature, and then ion-exchanged water and an aqueous ammonium solution were added to adjust the solid content to 44.5% by mass and the pH to 7.7. A binder emulsion (B-1) containing an acrylic binder having a glass transition temperature (Tg) of −25° C. as determined by differential scanning calorimetry (DSC) and an average particle size of 120 nm was obtained.

[0056] [Manufacturing Example 2] <Odor Removal Catalyst (C)> 0.0292 parts by mass of hexachloroplatinic acid (IV) hexahydrate (Fujifilm Wako Pure Chemical Industries, Ltd.) was weighed and dissolved in 80 mL of distilled water to obtain a solution. This solution was placed in a 300 mL eggplant-shaped flask, and 11 parts by mass of MFI-type zeolite (H-ZSM-5, Tosoh Corporation, HSZ 891HOA, silica / alumina ratio (SiO2 / Al2O3 ratio (mol / mol)): 1500, average particle size: 4 μm) was then added to the eggplant-shaped flask. The platinum compound solution was impregnated into the zeolite so that the platinum (Pt) loading was 0.1% by mass. The eggplant-shaped flask was then attached to a rotary evaporator, and the water was evaporated under vacuum at 70 °C. The remaining powder was then recovered. The recovered powder was placed in an electric furnace and calcined in air at 400 °C for 12 hours to obtain a powdered calcined product. Next, the powdered calcined body obtained by the calcination was subjected to hydrogen reduction using a catalyst analyzer BELCAT-B (manufactured by Microtrac BEL Corporation) as a heating furnace. This catalyst analyzer includes an electric furnace, a cooling fan for cooling the electric furnace, and a gas port capable of supplying various gases. First, the powdered calcined body was placed in a quartz tube, which was then set in the electric furnace portion of the catalyst analyzer. The powdered calcined body was then heated to 400°C at a rate of 10°C per minute under a helium gas flow, and then held at 400°C for 2 hours under a 5% hydrogen / argon gas flow. After that, the powdered calcined body was cooled under a helium gas flow while rotating the cooling fan attached to the catalyst analyzer (it took about 1 hour to cool from 400°C to 40°C). This hydrogen reduction was performed to prepare a Pt / zeolite odor removal catalyst (C-1).

[0057] <Deodorant coating substrate> Using a nanojetmizer (NJ-100, manufactured by Aisin Nano Technologies Co., Ltd.), odor removal catalyst (C-1), MFI-type zeolite-1 (H-ZSM-5, manufactured by Tosoh Corporation, HSZ 891HOA, silica / alumina ratio (SiO2 / Al2O3 ratio (mol / mol)): 1500, average particle size: 4 μm), and MFI-type zeolite-2 (H-ZSM-5, manufactured by Tosoh Corporation, HSZ 822HOA, silica / alumina ratio (SiO2 / Al2O3 ratio (mol / mol)): 23, average particle size: 4 μm) were crushed to an average particle size of 2 μm. 14.7 parts by mass of crushed odor removal catalyst (C-1), 4.9 parts by mass of MFI type zeolite-1, 9.8 parts by mass of MFI type zeolite-2, 13.2 parts by mass of binder emulsion (B-1), 26.4 parts by mass of SN Thickener 615 (manufactured by San Nopco Ltd., diluted 2 times with water), 21 parts by mass of DOWFAX 2A1 (surfactant, manufactured by Dow Chemical Co., diluted 10 times with water), and 3,000 parts by mass of water were mixed and stirred to obtain a coating liquid in which the particles were uniformly dispersed.

[0058] 1 kg of the coating liquid obtained above was stored in a metal tray, and a 20 cm x 30 cm substrate (A-1) that had been previously conditioned for one day in a constant temperature and humidity chamber (23 ° C, 60% RH) was immersed in it for 10 seconds to form a uniform coating. This was then passed through a roller-type manual dehydrator PESHANKO (manufactured by Topman Co., Ltd.) to dehydrate it, and then secured to a metal plate with clips. This was then placed in an inert oven DN610I (manufactured by Yamato Scientific Co., Ltd.) and dried at 100 ° C for 5 minutes (drying step (A)). It was then removed from the oven, the oven temperature was raised to 160 ° C, and it was then dried again for 5 minutes (drying step (B)), yielding a deodorizer-coated substrate containing the odor-removing catalyst (C-1). The deodorizing properties, flexibility, hydrophilicity, and rub fastness of the deodorizer-coated substrates obtained above were evaluated, and the results are summarized in Table 1.

[0059] [Examples 2 to 4, Comparative Examples 1 and 2] Deodorant-coated substrates were prepared in the same manner as in Example 1 except that the conditions were changed as shown in Table 1, and various evaluations were carried out.

[0060] <Evaluation method> [Deodorizing properties] Deodorant coated substrate 100cm 2 Each piece was cut into pieces, and after conditioning for one day, it was placed in a 5 L sampling bag (manufactured by Omi Odor Air Service Co., Ltd., material: vinyl alcohol-based polymer film). A sampling bag without a deodorant-coated substrate was used as a blank. 3 L of air that had been passed through an activated carbon filter was introduced into the sampling bag, and then an ethanol solution of isovaleric acid was poured into the sampling bag so that the isovaleric acid concentration in the sampling bag was 38 ppm. After leaving the sample to stand for 24 hours at room temperature (25°C), the concentration of isovaleric acid was measured using an acetic acid detector tube "Acetic Acid 81" (manufactured by Gastec Corporation) and evaluated as follows. A: Deodorization rate for blanks is 70% or more B: Deodorization rate against blank is 50% or more but less than 70% C: Deodorization rate relative to blank is less than 50%

[0061] [Flexibility] The 20cm x 30cm deodorant-coated substrate was lifted up in the hand and compared with an uncoated substrate of the same size, and evaluated as follows: A: Almost no change from before coating B: Slightly harder than before coating C: Harder than before coating

[0062] [Hydrophilicity] A drop of water was dropped onto the deodorant-coated substrate, and the time from when the drop adhered to the substrate until it completely soaked in was measured, and the evaluation was made as follows. A: Less than 3 seconds (same as before deodorant application) B: 3 seconds or more but less than 10 seconds C: 10 seconds or more

[0063] [Rubbing fastness] (Creating indicators) A photograph of a contamination grayscale in accordance with JIS L0805:2005 was taken against a white background, and the image was then opened in Microsoft PowerPoint with the vividness set to 10% in the "Picture Color" section of the figure formatting settings, and "Blur" selected as the "Artistic Effects" in the "Adjustments" section of the figure format tab. The image was then used with the eyedropper function to output the color code for each contamination grade, and the V value in the HSV color space for that color code was determined, creating a calibration curve for the V value and contamination grade. (Rubbing fastness test) A test white cotton cloth (Kanakin No. 3) conforming to JIS L0849:2024 was wrapped around a finger, moistened with water, and then rubbed 150 times back and forth over a 1cm x 10cm area of ​​the deodorant-coated substrate placed on a platform balance with a force that produced a load of approximately 150g. The color of the cotton cloth before and after the rub was measured to determine the V value in the same manner as in the method for creating the index above, and the contamination grade was calculated from the calibration curve.

[0064] [Table 1]

Claims

1. At least a part of the substrate (A) Binder emulsion (B), An odor removal catalyst (C) in which one or more metal elements of Groups 8 to 12 are supported on a porous carrier; and Surfactant (D) A method for producing a deodorizing material, comprising applying a coating liquid containing The coating amount of surfactant (D) was 0.07 g / m ２ That's all, A method for producing a deodorizing material, comprising, after applying the coating liquid, a drying step (A) and a drying step (B), wherein the drying step (A) and the drying step (B) satisfy the following formula (1): Drying temperature (°C) of drying step (A) × drying time (min) of drying step (A) × 0.7 + drying temperature (°C) of drying step (B) × drying time (min) of drying step (B) < 1500 (1)

2. The method for producing a deodorizing material according to claim 1 , wherein the drying step (A) and the drying step (B) are carried out in this order.

3. 2. The method for producing a deodorizing material according to claim 1, wherein the drying temperature in the drying step (A) is 80 to 180°C and the drying time is 3 to 18 minutes, and the drying temperature in the drying step (B) is 140 to 180°C and the drying time is 0.3 to 7 minutes.

4. The method for producing a deodorizing material according to claim 1, wherein the porous carrier of the odor removing catalyst (C) is MFI-type zeolite.

5. The method for producing a deodorizing material according to claim 1, wherein the metal element of the odor removing catalyst (C) is Pt.

6. 2. The method for producing a deodorizing material according to claim 1, wherein the binder emulsion (B) is an acrylic binder emulsion.

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