Deodorizer, and method for producing deodorizer

Abstract

To provide a deodorizer capable of suppressing reduction of removal performance of an odor of lower aldehydes on account of combining a material for strengthen removal performance of an acid odor though excelling in removal performance of an acid odor.SOLUTION: A deodorizer includes an active carbon (A) carried with an aldehyde remover, and an active carbon (B) carried with no aldehyde remover, where the active carbon (B) has a rate of a pore volume (cc / g) having a pore size of 1.0 nm or less to a total pore volume (cc / g) of 0.95 or more.SELECTED DRAWING: None

Description

[Technical Field]

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

[0002] In recent years, interest in air purification has increased, and there is a demand for environments with fewer unpleasant odors indoors, etc. Furthermore, triggered by the problem of sick house syndrome, there is also a demand for measures to deal with volatile organic compounds (VOCs) in living environments.

[0003] For example, in the interior of an automobile, many odors can be generated, including volatile organic compounds from interior resin parts such as seat pads, instrument panels, and door trims, as well as paints and adhesives, as well as exhaust gases, fuel odors, cigarette smoke, human bodies, and rotten food. Furthermore, since the interior of a vehicle is smaller than a house, there is a problem in that it is particularly prone to becoming filled with odors when sealed.

[0004] Deodorizing materials that remove malodors in such living environments are known. For example, Patent Document 1 discloses a deodorizing material that includes activated carbon and, supported on the activated carbon, (A) an aromatic amine and a sulfate of the aromatic amine, or (B) an aromatic amine, a sulfate of the aromatic amine, and sulfuric acid, wherein the activated carbon has a pore volume of 0.6 cc / g or more with a pore diameter of 0.65 nm or more and 2.0 nm or less. This deodorizing material is said to have excellent performance in removing odors caused by lower aldehydes such as acetaldehyde. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Publication No. 2019-198619 Summary of the Invention [Problem to be solved by the invention]

[0006] However, through investigations, the present inventors have found that there is room for further improvement in the performance of the deodorizing material disclosed in Patent Document 1 in removing acid odors such as acetic acid. Furthermore, they have found that when a material that improves the performance of removing acid odors such as acetic acid is used in combination with the deodorizing material disclosed in Patent Document 1, the performance of the deodorizing material disclosed in Patent Document 1 in removing odors caused by lower aldehydes, which is inherent in the material, may be reduced.

[0007] Therefore, the main object of the present invention is to provide a deodorizing material that has excellent performance in removing acid odors such as acetic acid, while also suppressing the decrease in odor removal performance caused by lower aldehydes per unit mass of the deodorizing material that results from the use of a material that enhances the performance in removing acid odors such as acetic acid in combination. [Means for solving the problem]

[0008] In order to solve the above problems, the present inventors conducted research and initially considered that using activated carbon supported with an inorganic base such as potassium carbonate would be effective in improving the performance of removing acid odors. To remove odors caused by lower aldehydes, it was then considered to use activated carbon supported with an aldehyde remover such as an aromatic amine and a sulfate of the aromatic amine, as described in Patent Document 1. However, the present inventors discovered that when activated carbon supported with an inorganic base and activated carbon supported with an aldehyde remover such as an aromatic amine and a sulfate of the aromatic amine were used in combination, a neutralization reaction occurred between the two supported substances, making it difficult to achieve both the performance of removing acid odors and the performance of removing odors caused by lower aldehydes.

[0009] Therefore, the present inventors have considered imparting acid odor removal performance to activated carbon that does not carry an inorganic base, etc., so as to prevent the above-mentioned neutralization reaction from occurring. However, the present inventors have discovered that simply combining activated carbon that does not carry an inorganic base, etc., with activated carbon that carries an aldehyde removing agent results in a decrease in odor removal performance per unit mass of the deodorizing material caused by lower aldehydes, compared to the deodorizing material of Patent Document 1, which consists only of activated carbon that carries an aldehyde removing agent.

[0010] Therefore, the present inventors have conducted further studies and have found that a deodorizing material containing activated carbon (A), activated carbon (B), and an aldehyde removing agent is provided, wherein the activated carbon (A) supports the aldehyde removing agent, the activated carbon (B) does not support the aldehyde removing agent, and the activated carbon (B) has a total pore volume VB calculated from a nitrogen desorption isotherm by the QSDFT method. T The ratio of the pore volume VBa (cc / g) in the range of pore diameters of 1.0 nm or less calculated by the QSDFT method from the nitrogen desorption isotherm to the pore volume VBa (cc / g) (VBa / VB T It has been discovered that by using a deodorizing material having a β-reactive index of 0.95 or higher, it is possible to suppress the decrease in odor removal performance caused by lower aldehydes per unit mass of the deodorizing material, which is caused by the use of a material that enhances the ability to remove acid odors such as acetic acid, while still retaining the ability to remove acid odors such as acetic acid. The present invention was completed based on these findings and through further investigation.

[0011] That is, the present invention provides the following aspects of the invention. Item 1. A deodorizing material containing activated carbon (A), activated carbon (B), and an aldehyde removing agent, wherein the activated carbon (A) supports the aldehyde removing agent, and the activated carbon (B) does not support the aldehyde removing agent, and the activated carbon (B) has a total pore volume VB calculated by the QSDFT method from a nitrogen desorption isotherm. T The ratio of the pore volume VBa (cc / g) in the range of pore diameters of 1.0 nm or less calculated by the QSDFT method from the nitrogen desorption isotherm to the pore volume VBa (cc / g) (VBa / VB T ) is 0.95 or more. Item 2. The total pore volume VA calculated by the QSDFT method from the nitrogen desorption isotherm of the activated carbon (A) T (cc / g) and the total pore volume VB calculated by the QSDFT method from the nitrogen desorption isotherm of the activated carbon (B). T (cc / g) and its ratio (VA T / VB T Item 2. The deodorizing material according to Item 1, wherein the value of (A) is 2.0 or more. Item 3. The deodorizing material according to Item 1 or 2, wherein the ratio of the mass of the activated carbon (A) after supporting the aldehyde-removing agent to the mass of the activated carbon (B) (mass of the activated carbon (A) after supporting the aldehyde-removing agent:mass of the activated carbon (B)) is 70:30 to 90:10. Item 4. The deodorizing material according to any one of Items 1 to 3, which is a sheet-like molded product. Item 5. A method for producing a deodorizing material, comprising the following steps (1) to (3): (1) A step of preparing activated carbon (A) carrying an aldehyde removing agent (2) Total pore volume VB calculated from nitrogen desorption isotherm by QSDFT method T The ratio of the pore volume VBa (cc / g) in the range of pore diameters of 1.0 nm or less calculated by the QSDFT method from the nitrogen desorption isotherm to the pore volume VBa (cc / g) (VBa / VB T ) is 0.95 or more and does not carry an aldehyde removal agent, and a step of preparing activated carbon (B) (3) A step of mixing the activated carbon (A) and the activated carbon (B). [Effects of the Invention]

[0012] The deodorizing material of the present invention is a deodorizing material containing activated carbon (A), activated carbon (B), and an aldehyde removing agent, wherein the activated carbon (A) supports the aldehyde removing agent, the activated carbon (B) does not support the aldehyde removing agent, and the activated carbon (B) has a total pore volume VB calculated by the QSDFT method from a nitrogen desorption isotherm. T The ratio of the pore volume VBa (cc / g) in the range of pore diameters of 1.0 nm or less calculated by the QSDFT method from the nitrogen desorption isotherm to the pore volume VBa (cc / g) (VBa / VB T ) is 0.95 or more, it is possible to suppress the decrease in odor removal performance due to lower aldehydes, which is caused by the combined use of a material that enhances the ability to remove acid odors such as acetic acid, while still retaining the ability to remove acid odors such as acetic acid. DETAILED DESCRIPTION OF THE INVENTION

[0013] The deodorizing material of the present invention is a deodorizing material containing activated carbon (A), activated carbon (B), and an aldehyde removing agent, wherein the activated carbon (A) supports the aldehyde removing agent, the activated carbon (B) does not support the aldehyde removing agent, and the activated carbon (B) has a total pore volume VB calculated by the QSDFT method from a nitrogen desorption isotherm. T The ratio of the pore volume VBa (cc / g) in the range of pore diameters of 1.0 nm or less calculated by the QSDFT method from the nitrogen desorption isotherm to the pore volume VBa (cc / g) (VBa / VB T ) is 0.95 or more. The deodorizing material of the present invention will be described in detail below.

[0014] In the following, the pore size (pore diameter; the same applies hereafter in this specification) and pore volume of activated carbon refer to the pore volume calculated by the QSDFT method (Quenched Solid Density Functional Theory) from the nitrogen desorption isotherm (relative pressure 0.02 to 0.995) measured at a temperature of 77 K. The QSDFT method is an analytical technique that can calculate pore size distributions from approximately 0.5 nm to approximately 40 nm, and is intended for pore size analysis of geometrically and chemically irregular microporous and mesoporous carbons. Because the QSDFT method explicitly takes into account the effects of pore surface roughness and heterogeneity, it is a method that significantly improves the accuracy of pore size distribution analysis. In the present invention, the nitrogen desorption isotherm can be measured using a gas adsorption amount measuring device such as "AUTOSORB-1-MP" manufactured by Quantachrome, and the pore size distribution analysis by the QSDFT method can be performed by applying the following calculation model: N at 77K on carbon [slit pore, QSDFT equilibrium model].

[0015] <Activated carbon (A)> The deodorizing material of the present invention contains activated carbon (A). In the deodorizing material of the present invention, the activated carbon (A) supports an aldehyde remover described below, and thereby contributes as a component for removing odors caused by lower aldehydes such as acetaldehyde.

[0016] The pore volume of the activated carbon (A) having a pore diameter of 1.0 nm or more is not particularly limited, but is preferably 0.2 to 0.6 cc / g, and more preferably 0.3 to 0.5 cc / g, from the viewpoint of further improving the performance of removing odors caused by lower aldehydes. In this specification, the pore diameter and pore volume of the activated carbon (A) refer to those before supporting an aldehyde removing agent, unless otherwise specified.

[0017] Total pore volume VA of activated carbon (A) T is not particularly limited, but from the viewpoint of further improving the performance of removing odors caused by lower aldehydes, it is about 1.1 to 3.0 times, preferably about 1.5 to 2.0 times the volume of pores in the range of pore diameters of 1.0 nm or more. Specifically, the total pore volume VA T is, for example, 0.7 to 2.0 cc / g, preferably 0.7 to 1.2 cc / g.

[0018] Total pore volume VA of activated carbon (A) T The ratio of the pore volume in the range of pore diameters 1.0 nm or more to the total pore volume (pore volume in the range of pore diameters 1.0 nm or more / total pore volume VA T ) is not particularly limited, and examples thereof include 0.2 to 0.7, preferably 0.3 to 0.6, and more preferably 0.4 to 0.6.

[0019] The pore volume of the activated carbon (A) having a pore diameter of 1.0 nm or less is not particularly limited, but from the viewpoint of further improving the performance of removing odors caused by lower aldehydes, it is preferably 0.2 to 0.5 cc / g, and more preferably 0.3 to 0.4 cc / g. In addition, the total pore volume VA T The ratio of the pore volume in the range of pore diameters of 1.0 nm or less to the total pore volume (pore volume in the range of pore diameters of 1.0 nm or less / total pore volume VA T ) is not particularly limited, and examples thereof include 0.2 to 0.55, preferably 0.3 to 0.5, and more preferably 0.4 to 0.5.

[0020] The ratio of the volume of pores having a diameter of 1.0 nm or less to the volume of pores having a diameter of 1.0 nm or more in the activated carbon (A) (pore volume having a diameter of 1.0 nm or less / pore volume having a diameter of 1.0 nm or more) is not particularly limited, and may be, for example, 0.5 to 2.0, preferably 0.6 to 1.5, and more preferably 0.7 to 1.0.

[0021] The pore volume of the activated carbon (A) having a pore diameter in the range of 0.65 nm to 2.0 nm is not particularly limited, but from the viewpoint of further improving the performance of removing odors caused by lower aldehydes, it is preferably 0.5 to 1.2 cc / g, and more preferably 0.6 to 1.0 cc / g. In addition, the total pore volume VA T The ratio of the pore volume in the pore diameter range of 0.65 nm to 2.0 nm (pore volume in the pore diameter range of 0.65 nm to 2.0 nm / total pore volume VA T ) is not particularly limited, and examples thereof include 0.7 to 1.0, preferably 0.75 to 0.9, and more preferably 0.8 to 0.85.

[0022] The pore volume of the activated carbon (A) having a pore diameter of 2.0 nm or less is not particularly limited, but from the viewpoint of further improving the performance of removing odors caused by lower aldehydes, it is preferably 0.6 to 0.8 cc / g, and more preferably 0.7 to 0.75 cc / g. In addition, the total pore volume VA T The ratio of the pore volume in the range of pore diameters of 2.0 nm or less to the total pore volume (pore volume in the range of pore diameters of 2.0 nm or less / total pore volume VA T ) is not particularly limited, but from the same viewpoint, it is preferably 0.8 to 1.0, and more preferably 0.9 to 1.0.

[0023] The pore volume of the activated carbon (A) having a pore diameter of 0.65 nm or less is not particularly limited, but from the viewpoint of further improving the performance of removing odors caused by lower aldehydes, it is preferably 0.08 to 0.15 cc / g, and more preferably 0.09 to 0.12 cc / g. In addition, the total pore volume VA TThe ratio of the pore volume in the range of pore diameters of 0.65 nm or less to the total pore volume (pore volume in the range of pore diameters of 0.65 nm or less / total pore volume VA T ) is not particularly limited, but from the same viewpoint, it is preferably 0.05 to 0.20, and more preferably 0.10 to 0.17.

[0024] The pore volume of the activated carbon (A) having a pore diameter of 2.0 nm or more is not particularly limited, but from the viewpoint of further improving the performance of removing odors caused by lower aldehydes, it is preferably 0.01 to 0.1 cc / g, and more preferably 0.01 to 0.05 cc / g. In addition, the total pore volume VA T The ratio of the pore volume in the range of pore diameters 2.0 nm or more to the total pore volume (pore volume in the range of pore diameters 2.0 nm or more / total pore volume VA T ) is not particularly limited, but from the same viewpoint, it is preferably 0.01 to 0.10, and more preferably 0.01 to 0.05.

[0025] The specific surface area of ​​the activated carbon (A) is not particularly limited, but from the viewpoint of further improving the performance of removing odors caused by lower aldehydes, it is preferable to use a specific surface area of ​​1500 m 2 / g or more is preferable, and 1700m 2 The upper limit of the specific surface area is not particularly limited, but for example, 3500 m 2 / g or less, 2500m 2 / g or less. That is, the specific surface area of ​​the activated carbon (A) is 1500 to 3500 m 2 / g, and 1700 to 2500m 2 The specific surface area of ​​the activated carbon (A) is a value determined by the BET method (one-point method with a relative pressure of 0.1 as the measurement point) described in JIS K1477:2007.

[0026] <Aldehyde remover> The deodorizing material of the present invention contains an aldehyde removing agent, and the aldehyde removing agent is supported on the activated carbon (A) described above, thereby making it possible to remove odors caused by lower aldehydes, such as acetaldehyde.

[0027] The aldehyde remover is preferably an aromatic amine compound, an alicyclic amine compound, a heterocyclic amine compound, an aliphatic amine compound, or a hydrazide compound.

[0028] Examples of aromatic amine compounds include aromatic amino acids such as o-, m-, and p-aminobenzoic acid, p-aminosalicylic acid, and m-aminosalicylic acid, sulfanilic acid, aniline, and anisidine, as well as metal salts thereof such as sodium salts and potassium salts, and inorganic salts thereof such as sulfates, nitrates, and hydrochlorides.

[0029] Examples of the alicyclic amine compound include cyclopropylamine, cyclobutylamine, cyclopentylamine, and cyclohexylamine.

[0030] Examples of heterocyclic amine compounds include pyrrolidine, piperidine, piperazine, morpholine, oxazine, quinuclidine, pyrrole, pyrazole, imidazole, pyridine, pyridazine, pyrimidine, pyrazine, oxazole, thiazole, 4-dimethylaminopyridine, 1,4-diazabicyclo[2,2,2]octane, 1,5-diazabicyclo[4,3,0]-5-nonene, and 1,8-diazabicyclo[5,4,0]-7-undecene.

[0031] Examples of the aliphatic amine compound include methylamine, ethylamine, propylamine, isopropylamine, butylamine, amylamine, hexylamine, heptylamine, octylamine, nonylamine, decylamine, undecylamine, dodecylamine, tridecylamine, tetradecylamine, pentadecylamine, cetylamine, tetraethylenepentamine, diethylenetriamine, arginine, ethanolamine, guanidine, and polyethyleneimine.

[0032] Examples of the hydrazide compound include adipic acid dihydrazide, succinic acid dihydrazide, sebacic acid dihydrazide, and carbodihydrazide.

[0033] Among the above, aromatic amine compounds or heterocyclic amines are preferred, p-aminobenzoic acid or morpholine are more preferred, and p-aminobenzoic acid is particularly preferred.

[0034] The aldehyde remover of the present invention may contain sulfuric acid together with the aromatic amine compound. Sulfuric acid has a relatively high boiling point and is difficult to volatilize. Sulfuric acid promotes dissolution of the aromatic amine compound in water, thereby enabling the aromatic amine compound to be uniformly supported on the activated carbon (A) during the manufacturing process of the deodorizing material described below.

[0035] In the deodorizing material of the present invention, the aldehyde removing agent is supported on the activated carbon (A), but is not supported on the activated carbon (B) described below. Since the aldehyde removing agent is not supported on the activated carbon (B), which contributes to removing acid odors such as acetic acid, specific pores in the activated carbon (B) are less likely to be clogged, and the activated carbon (B) is more likely to exhibit its ability to remove acid odors such as acetic acid.

[0036] The amount of the aldehyde removing agent supported on the activated carbon (A) is not particularly limited, but may be, for example, 10 to 40 parts by mass per 100 parts by mass of the activated carbon (A). From the viewpoint of further enhancing the performance of removing odors caused by lower aldehydes, an amount of 20 to 40 parts by mass is preferred, and an amount of 25 to 35 parts by mass is more preferred.

[0037] <Activated carbon (B)> The deodorizing material of the present invention does not support an aldehyde removing agent, and the total pore volume VB T The ratio of the pore volume VBa (cc / g) in the range of pore diameters of 1.0 nm or less calculated by the QSDFT method from the nitrogen desorption isotherm to the pore volume VBa (cc / g) (VBa / VB TThe activated carbon (B) has a pore size distribution of 0.95 or more. By using activated carbon (B) that does not carry an aldehyde removing agent and has the above-mentioned specific pore size distribution in combination with activated carbon (A) that carries an aldehyde removing agent, it is possible to achieve excellent performance in removing acid odors such as acetic acid, while suppressing the decrease in odor removal performance due to lower aldehydes per unit mass of the deodorizing material that occurs when a material that enhances the performance in removing acid odors such as acetic acid is used in combination.

[0038] The deodorizing material of the present invention, by using activated carbon having the above-mentioned specific pore distribution without an aldehyde removing agent in combination, can suppress the deterioration of odor removal performance caused by lower aldehydes per unit mass of the deodorizing material, which is caused by using a material that enhances the removal performance of acid odors such as acetic acid in combination with activated carbon carrying an aldehyde removing agent. The inventors believed that, because lower aldehydes such as acetaldehyde have small molecular sizes, it would be preferable to increase the volume of the pores in the activated carbon used in combination, which have small pore diameters, such as 1.0 nm or less. However, the inventors' investigations revealed that simply increasing the pore volume in the pore diameter range of 1.0 nm or less was not sufficient to suppress the deterioration of odor removal performance when the pore volume in the pore diameter range of 1.0 nm or more was also large. This is presumably because when there are many pores with a pore diameter of 1.0 nm or more, the diffusibility of lower aldehydes in those pores becomes too high, which makes physical adsorption in pores with a pore diameter of 1.0 nm or less difficult.The inventors then conducted further research and found that by using activated carbon with the above-mentioned specific pore distribution in combination with a material that improves the ability to remove acid odors such as acetic acid, the decrease in odor removal performance due to lower aldehydes per unit mass of the deodorizing material can be suppressed.

[0039] The total pore volume VB of activated carbon (B) calculated by the QSDFT method from the nitrogen desorption isotherm T The ratio of the pore volume VBa (cc / g) in the range of pore diameters of 1.0 nm or less calculated by the QSDFT method from the nitrogen desorption isotherm to the pore volume VBa (cc / g) (VBa / VB T) is preferably 0.95 to 0.99, more preferably 0.96 to 0.99.

[0040] The pore volume VBa of the activated carbon (B) having a pore diameter in the range of 1.0 nm or less is, for example, preferably 0.2 to 0.4 cc / g, and more preferably 0.3 to 0.35 cc / g, from the viewpoint of more efficiently exhibiting the performance of removing odors caused by lower aldehydes and the performance of removing acid odors such as acetic acid.

[0041] The pore volume of the activated carbon (B) in the range of pore diameters of 1.0 nm or more is not particularly limited, but from the viewpoint of more efficiently exhibiting the performance of removing odors caused by lower aldehydes and the performance of removing acid odors such as acetic acid, it is, for example, 0.001 to 0.05 cc / g, preferably 0.001 to 0.02 cc / g, and more preferably 0.003 to 0.006 cc / g.

[0042] Total pore volume of activated carbon (B) VB T In order to more efficiently remove odors caused by lower aldehydes and acid odors such as acetic acid, the total pore volume VB of the activated carbon (B) is about 10 to 100 times, preferably about 50 to 80 times, the pore volume of pores with a pore diameter of 1.0 nm or more. T Specifically, the amount is, for example, 0.2 to 0.5 cc / g, and preferably 0.3 to 0.4 cc / g.

[0043] Total pore volume VB of activated carbon (B) T The ratio of the pore volume in the range of pore diameters of 1.0 nm or more to the total pore volume VB T ) is not particularly limited, and examples thereof include 0.005 to 0.1, preferably 0.008 to 0.05, and more preferably 0.009 to 0.02.

[0044] The ratio of the pore volume VBa of pores with diameters of 1.0 nm or less to the pore volume of pores with diameters of 1.0 nm or more in the activated carbon (B) (pore volume VBa of pores with diameters of 1.0 nm or less / pore volume of pores with diameters of 1.0 nm or more) is not particularly limited, and may be, for example, 10 to 200, preferably 50 to 100, and more preferably 70 to 90.

[0045] The pore volume of the activated carbon (B) having a pore diameter in the range of 0.65 nm to 2.0 nm is not particularly limited, but from the viewpoint of more efficiently exhibiting the performance of removing odors caused by lower aldehydes and the performance of removing acid odors such as acetic acid, it is preferably, for example, 0.02 to 0.2 cc / g, and more preferably 0.05 to 0.15 cc / g. In addition, the total pore volume VB T The ratio of the pore volume in the pore diameter range of 0.65 nm to 2.0 nm (pore volume in the pore diameter range of 0.65 nm to 2.0 nm / total pore volume VB T ) is not particularly limited, and examples thereof include 0.2 to 0.5, preferably 0.3 to 0.45, and more preferably 0.35 to 0.4.

[0046] The pore volume of the activated carbon (B) having a pore diameter of 2.0 nm or less is not particularly limited, but from the viewpoint of more efficiently exhibiting the performance of removing odors caused by lower aldehydes and the performance of removing acid odors such as acetic acid, it is preferably, for example, 0.2 to 0.4 cc / g, and more preferably 0.3 to 0.35 cc / g. In addition, the total pore volume VB T The ratio of the pore volume in the range of pore diameters of 2.0 nm or less to the total pore volume VB T ) is not particularly limited, but from the same viewpoint, it is preferably 0.8 to 1.0, and more preferably 0.95 to 1.0.

[0047] The pore volume of the activated carbon (B) having a pore diameter of 0.65 nm or less is not particularly limited, but from the viewpoint of more efficiently exhibiting the performance of removing odors caused by lower aldehydes and the performance of removing acid odors such as acetic acid, it is preferably, for example, 0.1 to 0.25 cc / g, and more preferably 0.15 to 0.21 cc / g. In addition, the total pore volume VB T The ratio of the pore volume in the range of pore diameters of 0.65 nm or less to the total pore volume VB T ) is not particularly limited, but from the same viewpoint, it is preferably 0.3 to 0.8, and more preferably 0.5 to 0.7.

[0048] The specific surface area of ​​the activated carbon (B) is not particularly limited, but from the viewpoint of more efficiently exhibiting the performance of removing odors caused by lower aldehydes and the performance of removing acid odors such as acetic acid, it is preferable that the specific surface area be 500 m 2 / g or more is preferable, and 700m 2 The upper limit of the specific surface area is not particularly limited, but for example, 1500 m 2 / g or less, and 1000m 2 / g or less. That is, the specific surface area of ​​the activated carbon (B) is 500 to 1500 m 2 / g, and 700 to 1000m 2 The specific surface area of ​​the activated carbon (B) is a value determined by the BET method (one-point method in which the measurement point is a relative pressure of 0.1) described in JIS K1477:2007.

[0049] In the deodorizing material of the present invention, it is preferable that the activated carbon (B) contains as little inorganic base as possible. Examples of the inorganic base include one or more compounds selected from the group consisting of hydroxides, carbonates, and bicarbonates containing alkali metals. The content of the inorganic base in the activated carbon (B) is 1 part by mass or less, preferably 0.5 parts by mass or less, more preferably 0.1 parts by mass or less, and even more preferably 0 part by mass (no inorganic base) per 100 parts by mass of the activated carbon (B).

[0050] <Deodorizing material> The deodorizing material of the present invention is a deodorizing material containing the above-mentioned activated carbon (A), the above-mentioned activated carbon (B), and the above-mentioned aldehyde removing agent, wherein the activated carbon (A) is supported with the aldehyde removing agent, and the activated carbon (B) is not supported with the aldehyde removing agent.

[0051] In the deodorizing material of the present invention, the ratio of the pore volume (cc / g) of activated carbon (A) with a pore size range of 1.0 nm or more to the pore volume (cc / g) of activated carbon (B) with a pore size range of 1.0 nm or more (pore volume of activated carbon (A) with a pore size range of 1.0 nm or more / pore volume of activated carbon (B) with a pore size range of 1.0 nm or more) is preferably 10 to 200. By including two types of activated carbon with specific pore volumes, it is possible to achieve both the ability to remove odors caused by lower aldehydes and the ability to remove acid odors such as acetic acid. The ratio is more preferably 50 to 150, and even more preferably 80 to 120.

[0052] In the deodorizing material of the present invention, the total pore volume VA of the activated carbon (A) T (cc / g) and the total pore volume of activated carbon (B) VB T (cc / g) (total pore volume VA of activated carbon (A) T / total pore volume of activated carbon (B) VB T ) is, for example, preferably 2.0 to 4.0, more preferably 2.2 to 3.0, from the viewpoint of achieving both the ability to remove odors caused by lower aldehydes and the ability to remove acid odors such as acetic acid.

[0053] In the deodorizing material of the present invention, the ratio of the pore volume (cc / g) of the activated carbon (A) having a pore size in the range of 1.0 nm or less to the pore volume (cc / g) of the activated carbon (B) having a pore size in the range of 1.0 nm or less (pore volume of the activated carbon (A) having a pore size in the range of 1.0 nm or less / pore volume of the activated carbon (B) having a pore size in the range of 1.0 nm or less) is preferably, for example, 0.8 to 2.0, and more preferably 0.9 to 1.5, from the viewpoint of achieving a better balance between the ability to remove odors caused by lower aldehydes and the ability to remove acid odors such as acetic acid.

[0054] In the deodorizing material of the present invention, the ratio of the pore volume (cc / g) of the activated carbon (A) having a pore size in the range of 0.65 nm or more and 2.0 nm or less to the pore volume (cc / g) of the activated carbon (B) having a pore size in the range of 0.65 nm or more and 2.0 nm or less (pore volume of the activated carbon (A) having a pore size in the range of 0.65 nm or more and 2.0 nm or less / pore volume of the activated carbon (B) having a pore size in the range of 0.65 nm or more and 2.0 nm or less) is preferably, for example, 3.0 to 7.0, and more preferably 4.0 to 6.0, from the viewpoint of achieving a better balance between the ability to remove odors caused by lower aldehydes and the ability to remove acid odors such as acetic acid.

[0055] In the deodorizing material of the present invention, the ratio of the pore volume (cc / g) of the activated carbon (A) having a pore size in the range of 2.0 nm or less to the pore volume (cc / g) of the activated carbon (B) having a pore size in the range of 2.0 nm or less (pore volume of the activated carbon (A) having a pore size in the range of 2.0 nm or less / pore volume of the activated carbon (B) having a pore size in the range of 2.0 nm or less) is preferably, for example, 1.5 to 4.0, and more preferably 1.5 to 3.5, from the viewpoint of achieving a better balance between the ability to remove odors caused by lower aldehydes and the ability to remove acid odors such as acetic acid.

[0056] In the deodorizing material of the present invention, the ratio of the pore volume (cc / g) of the activated carbon (A) having a pore size in the range of 0.65 nm or less to the pore volume (cc / g) of the activated carbon (B) having a pore size in the range of 0.65 nm or less (pore volume of the activated carbon (A) having a pore size in the range of 0.65 nm or less / pore volume of the activated carbon (B) having a pore size in the range of 0.65 nm or less) is preferably, for example, 0.32 to 1.5, and more preferably 0.4 to 0.8, from the viewpoint of achieving a better balance between the ability to remove odors caused by lower aldehydes and the ability to remove acid odors such as acetic acid.

[0057] In the deodorizing material of the present invention, the specific surface area (m 2 / g) and the specific surface area of ​​activated carbon (B) (m 2 From the viewpoint of achieving a better balance between the performance of removing odors caused by lower aldehydes and the performance of removing acid odors such as acetic acid, the ratio of the specific surface area of ​​activated carbon (A) to the specific surface area of ​​activated carbon (B) (specific surface area of ​​activated carbon (A) / specific surface area of ​​activated carbon (B)) is preferably, for example, 1.0 to 3.0, and more preferably 1.5 to 2.5.

[0058] In the deodorizing material of the present invention, the ratio of the mass of activated carbon (A) after supporting the aldehyde removing material (i.e., the mass of activated carbon (A) before supporting the aldehyde removing agent + the mass of the aldehyde removing agent supported on activated carbon (A)) to the mass of activated carbon (B) (mass of activated carbon (A) after supporting the aldehyde removing agent: mass of activated carbon (B)) is, for example, 50:50 to 95:5, preferably 60:40 to 90:10, more preferably 70:30 to 90:10, and even more preferably 70:30 to 75:25.

[0059] In the deodorizing material of the present invention, the form of activated carbon (A) and activated carbon (B) is not particularly limited, but examples include granular activated carbon, powdered activated carbon, and fibrous activated carbon. From the viewpoint of a relatively fast removal rate of odors caused by lower aldehydes and acid odors such as acetic acid, fibrous activated carbon is more preferred. Activated carbon (A) and activated carbon (B) do not need to be in the same form; for example, one may be granular or powdered activated carbon and the other may be fibrous activated carbon. However, it is preferred that both activated carbon (A) and activated carbon (B) be fibrous activated carbon. When activated carbon (A) and activated carbon (B) are in the form of fibrous activated carbon, the average fiber diameter of the fibrous activated carbon is preferably 30 μm or less, more preferably approximately 5 to 20 μm. The average fiber diameter in the present invention is a value measured using an image processing fiber diameter measuring device (in accordance with JIS K 1477:2007). When the activated carbon (A) and the activated carbon (B) are in the form of granular activated carbon or powdered activated carbon, the particle size of the granular activated carbon or powdered activated carbon may be, for example, 0.01 to 5 mm in terms of cumulative volume percentage D50 measured by a laser diffraction / scattering method.

[0060] The raw material type and form of the activated carbon precursor for obtaining activated carbon (A) and activated carbon (B) are not particularly limited. Examples of raw material types for the activated carbon precursor include infusibilized or carbonized organic materials and curable resins such as phenolic resins. Examples of such organic materials include polyacrylonitrile, pitch, polyvinyl alcohol, and cellulose. Other examples include sawdust, wood chips, wood, peat, charcoal, coconut shells, coal, oil, carbonaceous materials (petroleum coke, coal coke, petroleum pitch, coal pitch, coal tar pitch, and composites thereof), synthetic resins (phenolic resin, polyacrylonitrile (PAN), polyimide, furan resin, and the like), cellulosic fibers (paper, cotton fiber, and the like), and composites thereof (paper-phenolic resin laminates, and the like), and fullerenes. Among these, pitch is preferred, and coal pitch is more preferred, in terms of the theoretical carbonization yield during carbonization. The form of the activated carbon precursor may be, for example, granular, powdery, fibrous, etc., as long as it matches the form of the activated carbon (A) and activated carbon (B).

[0061] The form of the deodorizing material is not particularly limited as long as it contains the activated carbon (A) carrying the above-mentioned aldehyde removing agent and the activated carbon (B) not carrying the aldehyde removing agent. Examples include granular compacts, fibrous compacts, and sheet-like compacts. In the present invention, the term "granular compacts" refers to compacts having a granular form, the term "fibrous compacts" refers to compacts having a fibrous form, and the term "sheet-like compacts" refers to compacts having a sheet-like form. The granular compacts, fibrous compacts, and sheet-like compacts will be described in detail below.

[0062] [Granular molded body] The granular molded body may be, for example, a composite granular activated carbon containing activated carbon (A) supporting an aldehyde removing agent, activated carbon (B) not supporting an aldehyde removing agent, and other raw materials other than the activated carbon (A) and the activated carbon (B). In the present invention, the term "composite granular activated carbon" refers to one or more activated carbons integrated with other raw materials other than activated carbon.

[0063] Examples of raw materials other than the activated carbon (A) carrying an aldehyde removing agent and the activated carbon (B) not carrying an aldehyde removing agent contained in the composite granular activated carbon include binder components (e.g., water-soluble binders, heat-fusible resins, fibrillated fibers, and pulp). The composite granular activated carbon can be obtained, for example, by mixing the activated carbon (A) carrying an aldehyde removing agent and the activated carbon (B) not carrying an aldehyde removing agent with a heat-fusible resin, heat-treating the resulting mixture, and fusing and integrating the raw materials with the molten heat-fusible resin. The obtained composite granular activated carbon may be divided to adjust the size.

[0064] The size of the granular molded body is not particularly limited, and for example, the maximum length is 0.5 mm or more. From the viewpoint of improving handleability and exhibiting the ability to remove odors caused by lower aldehydes and the ability to remove acid odors such as acetic acid for a long period of time, the maximum length is preferably 0.5 to 20 mm, and more preferably 0.5 to 10 mm.

[0065] The total content of the activated carbon (A) and the activated carbon (B) contained in the granular compact is, for example, 30 to 99.5% by weight, and preferably 20 to 95% by weight.

[0066] [Fibrous molded body] Examples of fibrous molded articles include cotton-like filaments, tows, cut fibers, and yarns made of fibrous activated carbon, i.e., activated carbon (A) carrying an aldehyde removing agent and activated carbon (B) not carrying an aldehyde removing agent. In the present invention, "cotton-like filaments" refer to filaments having a cotton-like shape. In the present invention, "tow" refers to an untwisted long fiber bundle formed by bundling multiple filaments. In the present invention, "cut fibers" refer to filaments cut into short fibers. In the present invention, "yarn" refers to a single yarn formed by twisting multiple filaments together. These may be used alone or in combination of two or more types.

[0067] The total content of the activated carbon (A) and the activated carbon (B) contained in the fibrous molded product is, for example, 30 to 100% by weight, and preferably 20 to 100% by weight.

[0068] [Sheet-like molded body] Examples of the sheet-like molded body include: (1) a fibrous activated carbon-containing nonwoven fabric containing activated carbon (A) carrying an aldehyde removing agent and activated carbon (B) not carrying an aldehyde removing agent, wherein the activated carbon (A) and the activated carbon (B) are in the form of fibrous activated carbon; (2) a composite nonwoven fabric containing activated carbon (A) carrying an aldehyde removing agent and activated carbon (B) not carrying an aldehyde removing agent, wherein an activated carbon layer in which the activated carbon (A) and the activated carbon (B) are fixed with a heat-fusible resin is provided between two sheets of nonwoven fabric (hereinafter also referred to as "composite nonwoven fabric A"); and (3) a composite nonwoven fabric in which a sheet-like molded body containing activated carbon (A) carrying an aldehyde removing agent and a sheet-like molded body containing activated carbon (B) not carrying an aldehyde removing agent are laminated and integrated (hereinafter also referred to as "composite nonwoven fabric B").

[0069] <(1) Nonwoven fabric containing fibrous activated carbon> The fibrous activated carbon-containing nonwoven fabric may contain activated carbon (A) carrying an aldehyde-removing agent and activated carbon (B) not carrying an aldehyde-removing agent, and may essentially contain only activated carbon (A) and activated carbon (B) both in the form of fibrous activated carbon, or may contain activated carbon (A) carrying an aldehyde-removing agent and activated carbon (B) not carrying an aldehyde-removing agent, and both in the form of fibrous activated carbon (A) and activated carbon (B), and other raw materials other than the activated carbon (A) and the activated carbon (B). A preferred example of a fibrous activated carbon-containing nonwoven fabric is one in which the fibrous activated carbon (A) carrying an aldehyde-removing agent and the fibrous activated carbon (B) not carrying an aldehyde-removing agent are mixed within the fibrous activated carbon-containing nonwoven fabric.

[0070] An example of a fibrous activated carbon-containing nonwoven fabric that includes activated carbon (A) carrying an aldehyde removing agent and activated carbon (B) not carrying an aldehyde removing agent, and that essentially contains only activated carbon (A) and activated carbon (B), both of which are in the form of fibrous activated carbon, is a fibrous activated carbon felt.

[0071] Examples of raw materials other than the activated carbon (A) carrying an aldehyde removing agent and the activated carbon (B) not carrying an aldehyde removing agent, which may be optionally contained in the fibrous activated carbon-containing nonwoven fabric, include heat-fusible resins. Examples of the form of the heat-fusible resin include powdered heat-fusible resins, powdered heat-fusible resins, and heat-fusible fibers. These may be used alone or in combination of two or more. In the present invention, "heat-fusible fibers" refer to fibers that exhibit fusion properties when heated.

[0072] Examples of heat-fusible resins include olefin-based resins (e.g., polyethylene, polypropylene, ethylene-vinyl acetate copolymer, ethylene-(meth)acrylic acid copolymer, ethylene-(meth)acrylic acid ester copolymer, etc.), vinyl acetate-based resins (e.g., polyvinyl acetate, vinyl acetate-vinyl chloride copolymer, etc.), polyvinyl alcohol-based resins (e.g., polyvinyl alcohol, ethylene-vinyl alcohol copolymer, etc.), acrylic resins, styrene-based resins, polyester-based resins, polyamide-based resins, thermoplastic polyurethane resins, etc. These may be used alone or in combination of two or more.

[0073] From the viewpoint of ease of heat treatment, the heat-fusible fibers are preferably heat-fusible fibers formed from two or more polymer components with different melting or softening points, and more preferably sheath-core heat-fusible fibers having a core-sheath structure with a high-melting point polymer as the core and a low-melting point polymer as the sheath. Examples of sheath-core heat-fusible fibers include polyolefin fibers having a polypropylene core and a modified polyethylene sheath, fibers having a polyethylene terephthalate core and a polyolefin sheath, and polyester fibers having a polyethylene terephthalate core and a low-melting point (low softening point) polyester sheath. These fibers may be used alone or in combination of two or more.

[0074] When the fibrous activated carbon-containing nonwoven fabric contains raw materials other than the activated carbon (A) carrying an aldehyde removing agent and the activated carbon (B) not carrying an aldehyde removing agent, the fibrous activated carbon-containing nonwoven fabric can be produced by, for example, a needle punch method, a wet papermaking method, a thermal bond method, a chemical bond method, or the like.

[0075] When the fibrous activated carbon-containing nonwoven fabric contains raw materials other than activated carbon (A) carrying an aldehyde removing agent and activated carbon (B) not carrying an aldehyde removing agent, the total content of activated carbon (A) and activated carbon (B) is, for example, 10 to 95% by weight, and from the viewpoint of achieving a better balance between the performance of removing odors caused by lower aldehydes and the performance of removing acid odors such as acetic acid, and making it easier to reduce the detachment of activated carbon from the fibrous activated carbon-containing nonwoven fabric, the total content is preferably 20 to 95% by weight, more preferably 30 to 90% by weight, even more preferably 40 to 90% by weight, and even more preferably 70 to 90% by weight.

[0076] The basis weight of the fibrous activated carbon-containing nonwoven fabric is not particularly limited, and may be, for example, 20 to 300 g / m 2 and preferably 25 to 250 g / m 2 and more preferably 50 to 200 g / m 2 and more preferably 80 to 200 g / m 2 and more preferably 100 to 200 g / m2 is.

[0077] The thickness of the fibrous activated carbon-containing nonwoven fabric is not particularly limited and is, for example, 0.1 to 2.0 mm, preferably 0.2 to 2.0 mm, more preferably 0.3 to 1.8 mm, even more preferably 0.4 to 1.7 mm, and even more preferably 0.5 to 1.6 mm. In the present invention, the thickness of the fibrous activated carbon-containing nonwoven fabric is measured at three arbitrary points by sandwiching the fibrous activated carbon-containing nonwoven fabric with a dial thickness gauge, and the average value of the thicknesses at the three points is obtained.

[0078] The apparent density of the fibrous activated carbon-containing nonwoven fabric is not particularly limited, and is, for example, 0.08 to 0.20 g / cm 3 and preferably 0.10 to 0.15 g / cm 3 In the present invention, the apparent density of the fibrous activated carbon-containing nonwoven fabric is determined from the basis weight of the fibrous activated carbon-containing nonwoven fabric and the thickness of the fibrous activated carbon-containing nonwoven fabric.

[0079] <Composite nonwoven fabric A> The composite nonwoven fabric A contains activated carbon (A) carrying an aldehyde removal agent and activated carbon (B) not carrying an aldehyde removal agent, and an activated carbon layer in which the activated carbon (A) and the activated carbon (B) are fixed with a heat-sealable resin is disposed between two sheets of nonwoven fabric.

[0080] The heat-fusible resin is preferably a heat-fusible fiber. Preferred embodiments of the heat-fusible resin and the heat-fusible fiber are the same as those explained in the description of the fibrous activated carbon-containing nonwoven fabric.

[0081] The total content of activated carbon (A) and activated carbon (B) contained in the activated carbon layer is, for example, 10 to 95% by weight, and from the viewpoint of achieving a better balance between the performance of removing odors caused by lower aldehydes and the performance of removing acid odors such as acetic acid, and making it easier to reduce the detachment of activated carbon (A) and activated carbon (B) from the composite nonwoven fabric A, it is preferably 20 to 95% by weight.

[0082] The thickness of the activated carbon layer is not particularly limited and is, for example, 0.01 to 1.7 mm. From the viewpoint of achieving a better balance between the ability to remove odors caused by lower aldehydes and the ability to remove acid odors such as acetic acid, and further improving handleability and dimensional stability, the thickness of the activated carbon layer is preferably 0.05 to 0.5 mm. In the present invention, the thickness of the activated carbon layer is measured as follows: The thickness of composite nonwoven fabric A is measured at three arbitrary points using a dial thickness gauge, and the average value of the thicknesses at the three points is defined as the thickness of composite nonwoven fabric A. Next, the thickness of the two nonwoven fabrics constituting composite nonwoven fabric A is measured at three arbitrary points, and the average value of the thicknesses at the three points is defined as the thickness of each nonwoven fabric. The thickness of the activated carbon layer is then determined by subtracting the sum of the thicknesses of the two nonwoven fabrics from the thickness of composite nonwoven fabric A thus determined.

[0083] In the composite nonwoven fabric A, the two nonwoven fabrics serve to maintain the shape of the activated carbon layer and to prevent the activated carbon and the like from falling off from the activated carbon layer.

[0084] Examples of nonwoven fabrics include long fiber nonwoven fabrics and short fiber nonwoven fabrics. Examples of long fiber nonwoven fabrics include spunbond nonwoven fabrics, tow-spread nonwoven fabrics, and melt-blown nonwoven fabrics. Examples of short fiber nonwoven fabrics include needle-punched nonwoven fabrics and wet-laid papermaking nonwoven fabrics.

[0085] Examples of fiber materials that can be used to form nonwoven fabrics include synthetic fibers such as polyester fibers, polyamide fibers, polyacrylic fibers, polypropylene fibers, and polyvinyl chloride fibers; natural fibers such as cotton, hemp, and wool; and regenerated fibers such as cupra rayon, viscose rayon, and lyocell.

[0086] The composite nonwoven fabric A can be produced, for example, by spreading a substantially uniform mixture of activated carbon (A) carrying an aldehyde removing agent, activated carbon (B) not carrying an aldehyde removing agent, and a heat-fusible resin or the like on a nonwoven fabric, placing another nonwoven fabric on top of it, and sandwiching the mixture between the two nonwoven fabrics while heating and pressing them together. Alternatively, the adhesive strength between the activated carbon layer and the nonwoven fabric may be strengthened by providing an adhesive sheet containing a thermoplastic resin or the like on the inside of the nonwoven fabric and then heat-pressing the nonwoven fabric.

[0087] The thickness of the composite nonwoven fabric A is not particularly limited and may be adjusted appropriately depending on the thickness of the activated carbon layer, but is, for example, 0.1 to 3.0 mm, preferably 0.2 to 1.7 mm. In the present invention, the thickness of the composite nonwoven fabric A is measured at three arbitrary points by sandwiching the composite nonwoven fabric A with a dial thickness gauge, and the thicknesses at the three points are averaged.

[0088] <Composite nonwoven fabric B> The composite nonwoven fabric B is formed by laminating and integrating a sheet-like molded article containing activated carbon (A) carrying an aldehyde-removing agent and a sheet-like molded article containing activated carbon (B) not carrying an aldehyde-removing agent. The activated carbon (A) carrying an aldehyde-removing agent and the activated carbon (B) not carrying an aldehyde-removing agent are preferably in the form of fibrous activated carbon.

[0089] The sheet-like molded article containing activated carbon (A) carrying an aldehyde removing agent and the sheet-like molded article containing activated carbon (B) not carrying an aldehyde removing agent may each contain raw materials other than the activated carbon (A) carrying an aldehyde removing agent and the activated carbon (B) not carrying an aldehyde removing agent. Examples of such raw materials include a heat-fusible resin. The heat-fusible resin is preferably a heat-fusible fiber. Preferred embodiments of the heat-fusible resin and the heat-fusible fiber are the same as those described for the fibrous activated carbon-containing nonwoven fabric.

[0090] Examples of a method for laminating a sheet-like molded body containing activated carbon (A) carrying an aldehyde removing agent and a sheet-like molded body containing activated carbon (B) not carrying an aldehyde removing agent include a method of bonding them together with an adhesive and a method of overlapping the sheet-like molded bodies by entangling the fiber materials constituting each sheet-like molded body using needle punching or the like.

[0091] The total content of activated carbon (A) and activated carbon (B) contained in composite nonwoven fabric B is, for example, 10 to 99% by weight, and preferably 20 to 95% by weight.

[0092] The thickness of the composite nonwoven fabric B is not particularly limited and is, for example, 0.01 to 3.0 mm, preferably 0.2 to 1.0 mm. In the present invention, the thickness of the composite nonwoven fabric B is the average value obtained by measuring the thickness at any three points across the composite nonwoven fabric B with a dial thickness gauge and averaging the thicknesses at the three points.

[0093] When the deodorizing material of the present invention is formed into a sheet-like molded product and used as an air purifying sheet, it can be laminated with a sheet having other functions. For example, a dust-removing sheet such as an electret nonwoven fabric sheet, a HEPA (high efficiency particulate air) filter, or a ULPA (ultra low penetration air) filter can be laminated to the deodorizing material of the present invention in the form of a sheet-like molded product to form a laminate with a dust-removing effect. Such a laminate can be suitably used in an air purifier that purifies air and removes dust.

[0094] <Substances to be removed by the deodorizing material of the present invention> The deodorizing material of the present invention is a deodorizing material containing activated carbon (A), activated carbon (B), and an aldehyde removing agent, wherein the activated carbon (A) supports the aldehyde removing agent, the activated carbon (B) does not support the aldehyde removing agent, and the activated carbon (B) has a total pore volume VB calculated by the QSDFT method from a nitrogen desorption isotherm. TThe ratio of the pore volume VBa (cc / g) in the range of pore diameters of 1.0 nm or less calculated by the QSDFT method from the nitrogen desorption isotherm to the pore volume VBa (cc / g) (VBa / VB T ) is 0.95 or more, it is possible to suppress the deterioration of odor removal performance due to lower aldehydes, which is caused by the combined use of a material that enhances the ability to remove acid odors such as acetic acid, while maintaining the ability to remove acid odors such as acetic acid. Substances that cause acid odors and are removed by the deodorizing material of the present invention include, for example, organic acids having 1 to 8 carbon atoms, preferably short-chain fatty acids having 1 to 6 carbon atoms, and more preferably short-chain fatty acids having 1 to 3 carbon atoms. Specific examples of the substances that cause acid odors and are removed by the deodorizing material of the present invention include formic acid, acetic acid, and propionic acid. Furthermore, the lower aldehydes that are removed by the deodorizing material of the present invention include aldehydes having 1 to 5 carbon atoms, specifically, formaldehyde, acetaldehyde, propionaldehyde, butylaldehyde, and valeraldehyde, with formaldehyde and acetaldehyde being preferred.

[0095] <Method of manufacturing the deodorizing material of the present invention> The method for producing a deodorizing material of the present invention includes the following steps (1) to (3). (1) A step of preparing activated carbon (A) carrying an aldehyde removing agent (2) Total pore volume VB calculated from nitrogen desorption isotherm by QSDFT method T The ratio of the pore volume VBa (cc / g) in the range of pore diameters of 1.0 nm or less calculated by the QSDFT method from the nitrogen desorption isotherm to the pore volume VBa (cc / g) (VBa / VB T ) is 0.95 or more and does not carry an aldehyde removal agent, and a step of preparing activated carbon (B) (3) A step of mixing the activated carbon (A) and the activated carbon (B).

[0096] In the present invention, the preferred configurations of the activated carbon (A), the aldehyde removing agent and the activated carbon (B) are the same as those explained for the deodorizing material of the present invention.

[0097] The method for producing activated carbon (A) and activated carbon (B) is not particularly limited. For example, activated carbon (A) and activated carbon (B) can be obtained by using the above-mentioned activated carbon precursor with water vapor as an activation gas and adjusting the activation temperature and activation time so as to obtain a predetermined pore distribution.

[0098] Next, an aldehyde removing agent is supported on activated carbon (A) as follows. A treatment liquid containing the aldehyde removing agent and water is prepared. The aldehyde removing agent may be dissolved in an aqueous solution of sulfuric acid and / or a salt thereof that has been sufficiently diluted with water, or may be dissolved in an aqueous solution containing sulfuric acid and / or a salt thereof at a relatively high concentration, and then the solution may be diluted with water to form a treatment liquid. As the sulfuric acid, either concentrated sulfuric acid or dilute sulfuric acid may be used. In addition, in order to dissolve the aldehyde removing agent in water, an aqueous solution of sulfuric acid and / or a salt thereof may be heated to a temperature within a range of, for example, 50 to 80°C, and the aldehyde removing agent may be mixed therewith.

[0099] The amount of the aldehyde removing agent in the treatment solution is not particularly limited as long as it is set so that the amount of the aldehyde removing agent carried in the deodorizing material of the present invention is within the desired range, and may be, for example, about 12 to 40 parts by mass per 100 parts by mass of the activated carbon (A) to be subsequently immersed. The amount of sulfuric acid and / or a salt thereof in the treatment solution is also not particularly limited, and may be about 12 to 40 parts by mass per 100 parts by mass of the activated carbon (A) to be subsequently immersed.

[0100] Next, the prepared activated carbon (A) is immersed in this treatment solution to support the aldehyde removing agent on the activated carbon (A). For example, the activated carbon (A) is uniformly dispersed in the treatment solution, and then the dispersion is allowed to stand for a sufficient period of time. The time for immersing the activated carbon (A) in the treatment solution is, for example, about 1 hour or more. The ratio of the mass of the activated carbon (A) to the volume of the treatment solution is, for example, within the range of 5 to 50 g / L. If this ratio is too small, it will take a longer time to support the aldehyde removing agent on the activated carbon (A). On the other hand, if this ratio is too large, it will be difficult to support the aldehyde removing agent uniformly on the activated carbon (A). Note that if the time for which the activated carbon (A) is in contact with the aqueous solution is sufficiently long, the effect of this ratio on the amount of aldehyde removing agent supported on the activated carbon (A) can be ignored. The treatment liquid in which the activated carbon (A) is immersed may be used in a heated state when the aldehyde removing agent is charged, or the heated treatment liquid may be used after being cooled.

[0101] Next, the treatment liquid is removed from the activated carbon (A) carrying the aldehyde removing agent. The method for removing the treatment liquid is not particularly limited, and can be, for example, by pulling up the activated carbon (A) from the treatment liquid. Prior to removing the treatment liquid from the activated carbon (A) carrying the aldehyde removing agent, the treatment liquid may be diluted with water.

[0102] Thereafter, the activated carbon (A) from which the treatment liquid has been removed is dried. This drying can be performed by, for example, natural drying, ventilation drying, hot air drying, microwave heating drying, indirect heating drying, or the like. The drying is performed so that the temperature of the activated carbon (A) is maintained at, for example, 130°C or less, preferably 80°C or less. In this manner, the aldehyde removing agent can be supported on the activated carbon (A).

[0103] Next, the activated carbon (A) carrying the aldehyde removing agent is mixed with the activated carbon (B). The mixing can be performed by a known method depending on the form of the deodorizing material. For example, in the case of forming a sheet-like molded product into a fibrous activated carbon-containing nonwoven fabric, the fibrous activated carbon (A) carrying the aldehyde removing agent, the fibrous activated carbon (B), and the heat-fusible fiber are opened and mixed using a carding machine to prepare a felt-like fibrous activated carbon aggregate. A plurality of the fibrous activated carbon aggregates are stacked to a predetermined thickness and needle-punched to integrate the nonwoven fabric and the fibrous activated carbon aggregate. The nonwoven fabric is then integrated with the fibrous activated carbon aggregate, and the resulting mixture is heat-treated to melt the heat-fusible component of the heat-fusible fiber. The resulting mixture is then cooled to produce the deodorizing material of the present invention.

[0104] The deodorizing material of the present invention can exhibit excellent performance in removing odors caused by lower aldehydes and acid odors such as acetic acid. Therefore, the deodorizing material of the present invention can be widely used in living environments and can be suitably used as interior materials for automobiles, trains, ships, airplanes, and the like. In particular, the deodorizing material of the present invention can be used as an automobile interior material that exhibits excellent performance in removing odors caused by lower aldehydes and acid odors such as acetic acid, by being placed inside the seat cover. That is, a vehicle seat containing the deodorizing material of the present invention can be used. [Example]

[0105] The present invention will be described in detail below with reference to examples and comparative examples, but the present invention is not limited to these examples.

[0106] [Test Example A (fibrous molded body)] 1.Measurement method (1) Pore volume (cc / g) and specific surface area (m 2 / g) measurement Pore ​​properties were measured from nitrogen adsorption isotherms at 77 K (relative pressures 0.02 to 0.995) using a Quantachrome "AUTOSORB-1-MP." Specific surface areas were calculated from the measurement point at a relative pressure of 0.1 using the BET method described in JIS K1477:2007. The total pore volume and the pore volumes within each pore size range listed in Table 1 were analyzed by calculating the pore size distribution using the N2 at 77 K on carbon [slit pore, QSDFT equilibrium model] calculation model for the measured nitrogen desorption isotherms. The pore volume in the pore size range of 1.0 nm or larger was calculated by subtracting the pore volume in the pore size range of 1.0 nm or smaller from the total pore volume obtained by the QSDFT method. The pore volume in the pore diameter range of 0.65 nm to 2.0 nm was calculated by subtracting the pore volume in the pore diameter range of 0.65 nm or less from the pore volume in the pore diameter range of 2.0 nm or less. The pore volume in the pore diameter range of 2.0 nm or more was calculated by subtracting the pore volume in the pore diameter range of 2.0 nm or less from the total pore volume obtained by the QSDFT method. The pore volume and specific surface area of ​​activated carbon (A) were measured before the aldehyde removal material was loaded onto the activated carbon (A).

[0107] (2) Measurement of the amount (parts by mass) of aldehyde removal agent supported on 100 parts by mass of activated carbon The total supported amount of p-aminobenzoic acid and the sulfate of p-aminobenzoic acid, which are aldehyde removal agents supported on activated carbon, was determined by measuring the organic matter concentration of the aldehyde removal agent solution before and after soaking with activated carbon using a total organic matter (TOC) meter. The amount supported was determined from the difference in organic matter concentration before and after soaking. Specifically, a total organic matter (TOC) meter (TOC-5000, manufactured by Shimadzu Corporation) was used to measure the organic matter concentration (mg C / L) converted to carbon (C) for the aldehyde removal agent solution before and after soaking, and the difference in concentration before and after the operation was determined. Separately, the total organic matter concentration was measured in the same manner for p-aminobenzoic acid solutions of known concentrations prepared by weighing, and a calibration curve showing the correspondence between organic matter concentration (mg C / L) and p-aminobenzoic acid concentration (mg p-aminobenzoic acid / L) was created. Using the prepared calibration curve, the difference in organic substance concentration (mg C / L) before and after the impregnation operation was converted to the difference in p-aminobenzoic acid concentration (mg p-aminobenzoic acid / L). The calculated difference in concentration was multiplied by the treatment solution volume (L) to calculate the difference in p-aminobenzoic acid mass. The calculated value was converted to parts by mass per 100 parts by mass of activated carbon before immersion in the aldehyde removal agent solution, and the obtained parts by mass was used as the total amount (parts by mass) of p-aminobenzoic acid and the sulfate of said p-aminobenzoic acid supported per 100 parts by mass of activated carbon.

[0108] (3) Acetaldehyde gas removal rate (%) 0.03 g of deodorizing material was placed in a 3 L sealed container and vacuumed. 500 ppm of acetaldehyde gas was prepared and sealed in the sealed container. The sealed container was left to stand in an environment at room temperature of 20°C. After 24 hours, the acetaldehyde concentration in the container was calculated by gas chromatography. The gas removal rate of the deodorizing material was calculated from the decrease in acetaldehyde concentration. (Gas removal rate = (500 ppm - acetaldehyde concentration (ppm) in the container after 24 hours) / 500 ppm x 100 (%)). A gas removal rate of 90% or higher was considered acceptable.

[0109] (4) Gas removal rate of acetic acid (%) 0.01 g of deodorizing material was placed in a 3 L airtight container and evacuated. 100 ppm of acetic acid gas was prepared and sealed in the airtight container. The airtight container was left standing in an environment at room temperature of 20°C. After 24 hours, the acetic acid concentration in the container was calculated by gas chromatography. The gas removal rate of the deodorizing material was calculated from the decrease in the acetic acid concentration. (Gas removal rate = (100 ppm - acetic acid concentration (ppm) in the container after 24 hours) / 100 ppm x 100 (%)). A gas removal rate of 83% or higher was considered acceptable.

[0110] Example 1 Preparation of activated carbon (A) Granular coal pitch was fed into a melt extruder, melt-mixed at a melting temperature of 320°C, and spun at a throughput rate of 20 g / min to obtain pitch fiber. The obtained pitch fiber was infusibilized by heating it in air from room temperature to 354°C at a rate of 1 to 30°C / min for 54 minutes to obtain an activated carbon precursor, which was an infusibilized pitch fiber. The obtained activated carbon precursor was activated by continuously introducing a gas with a 100% vol. HO concentration into an activation furnace and heat-treating it at an atmospheric temperature of 875°C for 50 minutes to obtain activated carbon (A), a fibrous activated carbon. The pore volume of the obtained activated carbon (A) in the range of pore diameters of 1.0 nm or more was 0.409 cc / g. The total pore volume VA T The pore volume in the pore diameter range of 1.0 nm or less was 0.344 cc / g, the pore volume in the pore diameter range of 0.65 nm to 2.0 nm was 0.621 cc / g, the pore volume in the pore diameter range of 2.0 nm or less was 0.727 cc / g, the pore volume in the pore diameter range of 0.65 nm or less was 0.106 cc / g, the pore volume in the pore diameter range of 2.0 nm or more was 0.025 cc / g, and the specific surface area was 1731 m 2 / g.

[0111] Preparation of a solution of aldehyde scavenger supported on activated carbon (A) First, a sulfuric acid aqueous solution containing sulfuric acid at a concentration of 75% by mass was prepared. This sulfuric acid aqueous solution was stirred at a temperature of 65°C or higher, and p-aminobenzoic acid was added as an aldehyde remover to the aqueous solution and completely dissolved. After that, water was added so that the ratio of the mass of activated carbon to the volume of the treated solution was 20 g / L, thereby obtaining a treated solution. The amounts of p-aminobenzoic acid and sulfuric acid charged were 30 parts by mass per 100 parts by mass of activated carbon (A). The amount of sulfuric acid charged (parts by mass) refers to the amount (parts by mass) of sulfuric acid alone, excluding pure water, in the 75% by mass aqueous sulfuric acid solution.

[0112] Supporting aldehyde removal agent on activated carbon (A) Next, 100 parts by mass of the activated carbon (A) obtained above was immersed in the aldehyde removing agent solution. Subsequently, this solution was stirred for 10 minutes to uniformly disperse the activated carbon (A) in the solution. Thereafter, this dispersion was allowed to stand. After standing for 8 hours or more, the activated carbon (A) was removed from the solution and dried in a dryer at 80°C for 3 hours to support the aldehyde removing agent on the activated carbon (A).

[0113] Preparation of activated carbon (B) Granular coal pitch was fed into a melt extruder, melt-mixed at a melting temperature of 320°C, and spun at a throughput rate of 20 g / min to obtain pitch fiber. The obtained pitch fiber was subjected to a stabilization treatment by increasing the temperature in air from room temperature to 354°C at a rate of 1 to 30°C / min for 54 minutes, to obtain an activated carbon precursor, which is a stabilized pitch fiber. The obtained activated carbon precursor was activated by continuously introducing a gas with a 100% vol. HO concentration into an activation furnace and heat-treating it at an atmospheric temperature of 875°C for 30 minutes, to obtain activated carbon (B), a fibrous activated carbon. The pore volume of the obtained activated carbon (B) in the range of pore diameters of 1.0 nm or more was 0.004 cc / g. The total pore volume VB TThe pore volume VBa in the pore diameter range of 1.0 nm or less was 0.311 cc / g, the pore volume VBa in the pore diameter range of 0.65 nm to 2.0 nm was 0.116 cc / g, the pore volume VBa in the pore diameter range of 2.0 nm or less was 0.315 cc / g, the pore volume VBa in the pore diameter range of 0.65 nm or less was 0.199 cc / g, the pore volume VBa in the pore diameter range of 2.0 nm or more was 0.000 cc / g, and the specific surface area was 825 m 2 / g.

[0114] Mixture of activated carbon (A) and activated carbon (B) The activated carbon (A) carrying an aldehyde removing agent and the activated carbon (B) were mixed by carding so that the mass ratio of the activated carbon (A) carrying an aldehyde removing agent: the activated carbon (B) was 55:20, thereby obtaining the deodorizing material of the present invention.

[0115] <Example 2> Preparation of activated carbon (A) The activated carbon (A) prepared in Example 1 was prepared.

[0116] Preparation of a solution of aldehyde removal agent to be supported on activated carbon (A) and support of the aldehyde removal agent on activated carbon (A) In the same manner as in Example 1, a solution of an aldehyde removing agent was prepared, and the aldehyde removing agent was supported on activated carbon (A).

[0117] Preparation of activated carbon (B) The activated carbon (B) prepared in Example 1 was prepared.

[0118] Mixture of activated carbon (A) and activated carbon (B) The activated carbon (A) carrying an aldehyde removing agent and the activated carbon (B) were mixed by carding so that the mass ratio of the activated carbon (A) carrying an aldehyde removing agent: the activated carbon (B) was 65:10, thereby obtaining the deodorizing material of the present invention.

[0119] <Comparative Example 1> Preparation of activated carbon (A) The activated carbon (A) prepared in Example 1 was prepared.

[0120] Preparation of a solution of aldehyde removal agent to be supported on activated carbon (A) and support of the aldehyde removal agent on activated carbon (A) In the same manner as in Example 1, a solution of an aldehyde removing agent was prepared, and the aldehyde removing agent was supported on activated carbon (A).

[0121] Preparation of activated carbon (B) Granular coal pitch was fed into a melt extruder, melt-mixed at a melting temperature of 320°C, and spun at a throughput rate of 20 g / min to obtain pitch fiber. The obtained pitch fiber was subjected to a stabilization treatment by increasing the temperature in air from room temperature to 354°C at a rate of 1 to 30°C / min for 54 minutes, to obtain an activated carbon precursor, which is a stabilized pitch fiber. The obtained activated carbon precursor was activated by continuously introducing a gas with a 100% vol. HO concentration into an activation furnace and heat-treating it at an atmospheric temperature of 875°C for 40 minutes, to obtain activated carbon (B), a fibrous activated carbon. The pore volume of the obtained activated carbon (B) in the range of pore diameters of 1.0 nm or more was 0.076 cc / g. The total pore volume VB T The pore volume VBa in the pore diameter range of 1.0 nm or less was 0.401 cc / g, the pore volume VBa in the pore diameter range of 0.65 nm to 2.0 nm was 0.255 cc / g, the pore volume VBa in the pore diameter range of 2.0 nm or less was 0.476 cc / g, the pore volume VBa in the pore diameter range of 0.65 nm or less was 0.221 cc / g, the pore volume VBa in the pore diameter range of 2.0 nm or more was 0.000 cc / g, and the specific surface area was 1232 m 2 / g.

[0122] Mixture of activated carbon (A) and activated carbon (B) Activated carbon (A) carrying an aldehyde removing agent and activated carbon (B) were mixed by carding so that the mass ratio of activated carbon (A) carrying an aldehyde removing agent:activated carbon (B) was 55:20, thereby obtaining a deodorizing material of Comparative Example 1.

[0123] <Comparative Example 2> Preparation of activated carbon (A) The activated carbon (A) prepared in Example 1 was prepared.

[0124] Preparation of a solution of aldehyde removal agent to be supported on activated carbon (A) and support of the aldehyde removal agent on activated carbon (A) In the same manner as in Example 1, a solution of an aldehyde removing agent was prepared, and the aldehyde removing agent was supported on activated carbon (A).

[0125] Preparation of activated carbon (B) Granular coal pitch was fed into a melt extruder, melt-mixed at a melting temperature of 320°C, and spun at a throughput rate of 20 g / min to obtain pitch fiber. The obtained pitch fiber was subjected to a stabilization treatment by increasing the temperature in air from room temperature to 354°C at a rate of 1 to 30°C / min for 54 minutes, to obtain an activated carbon precursor, which is a stabilized pitch fiber. The obtained activated carbon precursor was activated by continuously introducing a gas with a 100% vol. HO concentration into an activation furnace and heat-treating it at an atmospheric temperature of 875°C for 50 minutes, to obtain activated carbon (B), a fibrous activated carbon. The pore volume of the obtained activated carbon (B) in the range of pore diameters of 1.0 nm or more was 0.409 cc / g. The total pore volume VB T The pore volume VBa in the pore diameter range of 1.0 nm or less was 0.344 cc / g, the pore volume VBa in the pore diameter range of 0.65 nm to 2.0 nm was 0.621 cc / g, the pore volume VBa in the pore diameter range of 2.0 nm or less was 0.727 cc / g, the pore volume VBa in the pore diameter range of 0.65 nm or less was 0.106 cc / g, the pore volume VBa in the pore diameter range of 2.0 nm or more was 0.025 cc / g, and the specific surface area VBa was 1731 m 2 / g.

[0126] Mixture of activated carbon (A) and activated carbon (B) The activated carbon (A) carrying an aldehyde removing agent and the activated carbon (B) were mixed by carding so that the mass ratio of the activated carbon (A) carrying an aldehyde removing agent:activated carbon (B) was 55:20, thereby obtaining a deodorizing material of Comparative Example 2.

[0127] <Comparative Example 3> Preparation of activated carbon (A) The activated carbon (A) prepared in Example 1 was prepared.

[0128] Preparation of a solution of aldehyde removal agent to be supported on activated carbon (A) and support of the aldehyde removal agent on activated carbon (A) A solution of an aldehyde removing agent was prepared, and the aldehyde removing agent was supported on activated carbon (A) in the same manner as in Example 1. Then, activated carbon (B) was not used in combination, and only activated carbon (A) supported with the aldehyde removing agent was used to prepare a deodorizing material of Comparative Example 3.

[0129] The gas removal rates of acetaldehyde and acetic acid were measured according to the above-mentioned methods using the deodorizing materials obtained in Examples 1 and 2 and Comparative Examples 1 to 3. The results are shown in Table 1.

[0130] [Table 1]

[0131] Examples 1 and 2 are deodorizing materials containing activated carbon (A), activated carbon (B), and an aldehyde removing agent, in which the activated carbon (A) supports the aldehyde removing agent, and the activated carbon (B) does not support the aldehyde removing agent, and the activated carbon (B) has a total pore volume VB calculated by the QSDFT method from a nitrogen desorption isotherm. T The ratio of the pore volume VBa (cc / g) in the range of pore diameters of 1.0 nm or less calculated by the QSDFT method from the nitrogen desorption isotherm to the pore volume VBa (cc / g) (VBa / VB T ) is 0.95 or more, it has been made clear that while it has the ability to remove acid odors such as acetic acid, it also suppresses the decline in odor removal performance caused by lower aldehydes that occurs when a material that enhances the ability to remove acid odors such as acetic acid is used in combination.

[0132] On the other hand, in Comparative Examples 1 and 2, the activated carbon (B) has a total pore volume VB calculated from the nitrogen desorption isotherm by the QSDFT method. T The ratio of the pore volume VBa (cc / g) in the range of pore diameters of 1.0 nm or less calculated by the QSDFT method from the nitrogen desorption isotherm to the pore volume VBa (cc / g) (VBa / VB T ) was less than 0.95, it was not possible to suppress the decline in odor removal performance caused by lower aldehydes due to the combined use of a material that enhances the ability to remove acid odors such as acetic acid.

[0133] Comparative Example 3 was a deodorizing material that did not contain activated carbon (B), and therefore had insufficient performance in removing acid odors such as acetic acid.

[0134] [Test Example B (sheet-shaped molded product)] 1.Measurement method (1) Pore volume (cc / g) and specific surface area (m 2 / g) measurement Pore ​​properties were measured from nitrogen adsorption isotherms at 77 K (relative pressures 0.02 to 0.995) using a Quantachrome "AUTOSORB-1-MP." Specific surface areas were calculated from the measurement point at a relative pressure of 0.1 using the BET method described in JIS K1477:2007. The total pore volume and the pore volumes within each pore size range listed in Table 1 were analyzed by calculating the pore size distribution using the N2 at 77 K on carbon [slit pore, QSDFT equilibrium model] calculation model for the measured nitrogen desorption isotherms. The pore volume in the pore size range of 1.0 nm or larger was calculated by subtracting the pore volume in the pore size range of 1.0 nm or smaller from the total pore volume obtained by the QSDFT method. The pore volume in the pore diameter range of 0.65 nm to 2.0 nm was calculated by subtracting the pore volume in the pore diameter range of 0.65 nm or less from the pore volume in the pore diameter range of 2.0 nm or less. The pore volume in the pore diameter range of 2.0 nm or more was calculated by subtracting the pore volume in the pore diameter range of 2.0 nm or less from the total pore volume obtained by the QSDFT method. The pore volume and specific surface area of ​​activated carbon (A) were measured before the aldehyde removal material was loaded onto the activated carbon (A).

[0135] (2) Measurement of the amount (parts by mass) of aldehyde removal agent supported on 100 parts by mass of activated carbon The total supported amount of p-aminobenzoic acid and the sulfate of p-aminobenzoic acid, which are aldehyde removal agents supported on activated carbon, was determined by measuring the organic matter concentration of the aldehyde removal agent solution before and after soaking with activated carbon using a total organic matter (TOC) meter. The amount supported was determined from the difference in organic matter concentration before and after soaking. Specifically, a total organic matter (TOC) meter (TOC-5000, manufactured by Shimadzu Corporation) was used to measure the organic matter concentration (mg C / L) converted to carbon (C) for the aldehyde removal agent solution before and after soaking, and the difference in concentration before and after the operation was determined. Separately, the total organic matter concentration was measured in the same manner for p-aminobenzoic acid solutions of known concentrations prepared by weighing, and a calibration curve showing the correspondence between organic matter concentration (mg C / L) and p-aminobenzoic acid concentration (mg p-aminobenzoic acid / L) was created. Using the prepared calibration curve, the difference in organic substance concentration (mg C / L) before and after the impregnation operation was converted to the difference in p-aminobenzoic acid concentration (mg p-aminobenzoic acid / L). The calculated difference in concentration was multiplied by the treatment solution volume (L) to calculate the difference in p-aminobenzoic acid mass. The calculated value was converted to parts by mass per 100 parts by mass of activated carbon before immersion in the aldehyde removal agent solution, and the obtained parts by mass was used as the total amount (parts by mass) of p-aminobenzoic acid and the sulfate of said p-aminobenzoic acid supported per 100 parts by mass of activated carbon.

[0136] (3) Thickness of deodorizing material (mm) The deodorizing material was sandwiched between two pieces of material and the thickness was measured at three random points using a thickness measuring device called a "Dial Thickness Gauge" (manufactured by Ozaki Seisakusho Co., Ltd., measuring probe 10 mm Φ), and the average value of the thicknesses at the three points was taken as the thickness of the deodorizing material.

[0137] (4) Acetaldehyde gas removal rate (%) 0.02 g of deodorizing material was placed in a 3 L sealed container and evacuated. 90 ppm acetaldehyde gas was prepared and sealed in the sealed container. The sealed container was left to stand in an environment at room temperature of 20°C. After 24 hours, the acetaldehyde concentration in the container was measured using a gas detector tube (Gastec Corporation, No. 92M). The gas removal rate of the deodorizing material was calculated from the decrease in acetaldehyde concentration (gas removal rate = (90 ppm - acetaldehyde concentration (ppm) in the container after 24 hours) / 90 ppm × 100 (%)). A gas removal rate of 75% or higher was considered acceptable.

[0138] (5) Gas removal rate of acetic acid (%) 0.01 g of deodorizing material was placed in a 3 L airtight container and evacuated. 90 ppm of acetic acid gas was prepared and sealed in the airtight container. The airtight container was left standing in an environment at room temperature of 20°C. After 24 hours, the acetic acid concentration in the container was measured using a gas detector tube (No. 81, manufactured by Gastec Corporation). The gas removal rate of the deodorizing material was calculated from the decrease in the acetic acid concentration. (Gas removal rate = (90 ppm - acetic acid concentration (ppm) in the container after 24 hours) / 90 ppm × 100 (%)). A gas removal rate of 65% or higher was considered to be acceptable.

[0139] Example 3 Preparation of activated carbon (A) The activated carbon (A) prepared in Example 1 was prepared.

[0140] Preparation of a solution of aldehyde removal agent to be supported on activated carbon (A) and support of the aldehyde removal agent on activated carbon (A) In the same manner as in Example 1, a solution of an aldehyde removing agent was prepared, and the aldehyde removing agent was supported on activated carbon (A).

[0141] Preparation of activated carbon (B) The activated carbon (B) prepared in Example 1 was prepared.

[0142] Mixture of activated carbon (A) and activated carbon (B) Activated carbon (A) carrying an aldehyde-removing agent, activated carbon (B), and heat-fusible fibers (manufactured by Huvis under the trade name LMF 2 DENIER; a core-sheath type heat-fusible fiber comprising polyethylene terephthalate as a core and a polyester containing isophthalic acid and terephthalic acid as polybasic acid components as a sheath; the sheath, which is the heat-fusible component, has a melting point of 110°C, a glass transition point of 65°C, a fineness of 2.2 dtex, and a fiber length of 51 mm) were opened and mixed using a carding machine in a mass ratio of aldehyde-removing agent-carrying activated carbon (A):activated carbon (B):heat-fusible fiber = 58:22:20, to produce a felt-like fibrous activated carbon aggregate. A plurality of sheets of the fibrous activated carbon aggregate were stacked and needle-punched to intertwine the activated carbon (A) carrying the aldehyde removing agent, the activated carbon (B) and the heat-fusible fiber, and the mixture was passed through a heated roller at 105°C to melt the heat-fusible component of the heat-fusible fiber, thereby obtaining a sheet-shaped molded deodorizing material of the present invention. The resulting deodorizing material had a thickness of 1.1 mm and an apparent density of 0.14 g / cm. 3 It was.

[0143] <Comparative Example 4> Preparation of activated carbon (A) The activated carbon (A) prepared in Example 1 was prepared.

[0144] Preparation of a solution of aldehyde removal agent to be supported on activated carbon (A) and support of the aldehyde removal agent on activated carbon (A) In the same manner as in Example 1, a solution of an aldehyde removing agent was prepared, and the aldehyde removing agent was supported on activated carbon (A).

[0145] Production of sheet-shaped molded products Activated carbon (A) carrying an aldehyde-removing agent and heat-fusible fibers (manufactured by Huvis under the trade name LMF 2 DENIER; a core-sheath type heat-fusible fiber comprising polyethylene terephthalate as a core and a polyester containing isophthalic acid and terephthalic acid as polybasic acid components as a sheath; the sheath, which is the heat-fusible component, has a melting point of 110°C, a glass transition point of 65°C, a fineness of 2.2 dtex, and a fiber length of 51 mm) were opened and mixed using a carding machine in a mass ratio of activated carbon (A) carrying an aldehyde-removing agent:heat-fusible fibers = 80:20, to produce a felt-like fibrous activated carbon aggregate. A plurality of sheets of the fibrous activated carbon aggregate were stacked and needle-punched to entangle the activated carbon (A) carrying the aldehyde removing agent and the heat-fusible fibers, and the resultant was passed through a heated roller at a temperature of 105°C to melt the heat-fusible component of the heat-fusible fibers, thereby obtaining a sheet-shaped molded product, a deodorizing material of Comparative Example 4. The resulting deodorizing material had a thickness of 0.5 mm and an apparent density of 0.20 g / cm. 3 It was.

[0146] The gas removal rates of acetaldehyde and acetic acid were measured according to the above-mentioned methods using the deodorizing materials obtained in Example 3 and Comparative Example 4. The results are shown in Table 2.

[0147] [Table 2]

[0148] Example 3 is a deodorizing material containing activated carbon (A), activated carbon (B), and an aldehyde removing agent, in which the activated carbon (A) is supported with the aldehyde removing agent, and the activated carbon (B) is not supported with the aldehyde removing agent, and the activated carbon (B) has a total pore volume VB calculated by the QSDFT method from a nitrogen desorption isotherm. T The ratio of the pore volume VBa (cc / g) in the range of pore diameters of 1.0 nm or less calculated by the QSDFT method from the nitrogen desorption isotherm to the pore volume VBa (cc / g) (VBa / VB T) is 0.95 or more, it has been made clear that while it has the ability to remove acid odors such as acetic acid, it also suppresses the decline in odor removal performance caused by lower aldehydes that occurs when a material that enhances the ability to remove acid odors such as acetic acid is used in combination.

[0149] Comparative Example 4 was a deodorizing material that did not contain activated carbon (B), and therefore had insufficient performance in removing acid odors such as acetic acid.

Claims

1. A deodorizing material containing activated carbon (A), activated carbon (B), and an aldehyde remover, the activated carbon (A) supports the aldehyde removing agent, The activated carbon (B) does not support the aldehyde removing agent, The activated carbon (B) has a total pore volume VB calculated from a nitrogen desorption isotherm by the QSDFT method. Ｔ The ratio of the pore volume VBa (cc / g) of the pores having a pore diameter of 1.0 nm or less calculated from the nitrogen desorption isotherm by the QSDFT method to the pore volume VBa (cc / g) of the pores having a pore diameter of 1.0 nm or less (VBa / VB Ｔ ) is 0.95 or more.

2. The total pore volume VA calculated by the QSDFT method from the nitrogen desorption isotherm of the activated carbon (A) Ｔ (cc / g) and the total pore volume VB calculated by the QSDFT method from the nitrogen desorption isotherm of the activated carbon (B). Ｔ (cc / g) Ｔ / VB Ｔ 2. The deodorizing material according to claim 1, wherein the value of (a) is 2.0 or more.

3. 3. The deodorizing material according to claim 2, wherein the ratio of the mass of the activated carbon (A) after supporting the aldehyde removing material to the mass of the activated carbon (B) (mass of the activated carbon (A) after supporting the aldehyde removing agent: mass of the activated carbon (B)) is 70:30 to 90:

10.

4. The deodorizing material according to any one of claims 1 to 3, which is a sheet-like molded product.

5. A method for producing a deodorizing material, comprising the following steps (1) to (3): (1) A step of preparing activated carbon (A) carrying an aldehyde removing agent (2) Total pore volume VB calculated from the nitrogen desorption isotherm by the QSDFT method Ｔ The ratio of the pore volume VBa (cc / g) of the pores having a pore diameter of 1.0 nm or less calculated from the nitrogen desorption isotherm by the QSDFT method to the pore volume VBa (cc / g) of the pores having a pore diameter of 1.0 nm or less (VBa / VB Ｔ ) is 0.95 or more and does not carry an aldehyde removing agent. (3) A step of mixing the activated carbon (A) and the activated carbon (B).

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