JP7637478B2 - Deodorant - Google Patents

Description

The present invention relates to a deodorant that contains a hydrazide compound and has excellent durability of deodorizing effect.

In recent years, as the demand for more comfortable living has increased, so has the need for odor control measures to make living spaces more comfortable. Conventionally, methods of using spray-type, aerosol-type, or stationary deodorants to spray or volatilize the space have been known to combat odors in daily life. In these deodorants, organic deodorant components such as dihydrazide compounds and polyamine compounds, and plant extracts such as polyphenols are used as deodorant ingredients.

Among these deodorant components, hydrazide compounds have an excellent deodorant effect against aldehyde-based and ammonia-based odors, and various deodorants containing hydrazide compounds have been studied. For example, Patent Document 1 reports that a deodorant containing a hydrazide compound, adenine sulfate, and cationic amino-modified silicone is not only excellent at removing aldehyde-based and ammonia-based odor components not only at room temperature but also in high temperature environments, but also has little re-release of the removed odor components. Patent Document 2 reports that a deodorant containing a hydrazide compound, hydroxylamine sulfate, smectite, and water can have an excellent deodorant effect against both aldehyde and ammonia. However, Patent Documents 1 and 2 do not consider improving the durability of the deodorant effect of the hydrazide compound.

JP 2012-19872 A JP 2010-5093 A

Conventional odor countermeasures involve spraying a deodorant into a space where deodorization is required, or spraying or applying a deodorant to an item that has an odor attached to it, so that the sprayed or applied deodorant comes into direct contact with the odor. For deodorants that are sprayed or applied directly to odors in this way, it is important that the deodorant effect itself is high, but it is also desirable that the deodorant effect lasts.

On the other hand, as an odor countermeasure, it is also effective to use a deodorizing liquid placed in the space where deodorization is required (indoor space, inside of a vehicle, etc.) to eliminate or mitigate odors in the space. It is also effective to apply a deodorizing liquid to the structures (walls, floors, ceilings, doors, etc.) of the space where deodorization is required (indoor space, inside of a vehicle, etc.) or to products (curtains, sofas, etc.) in the space, thereby adding a deodorizing function to the structures or products, thereby eliminating or mitigating odors in the space. When eliminating or mitigating odors in a space using this method, it is important that the deodorizing effect of the deodorizing ingredients is sustained, since the deodorizing liquid is not sprayed directly onto the odors in the space.

As such, deodorizers (especially those that are left in a space or attached to structures or products in the space) are required to have a sustained deodorizing effect.

The inventors therefore investigated the durability of deodorants containing hydrazide compounds and found that while conventional deodorants containing hydrazide compounds have excellent deodorant effects immediately after spraying or application, over time as they dry out, the deodorant effect disappears and the deodorant effect cannot be sustained.

Therefore, the present invention aims to provide a deodorant that contains a hydrazide compound and has excellent durability of deodorizing effect.

The inventors conducted extensive research to solve the above problems and discovered that a deodorant containing a hydrazide compound and water, a deodorant component and water, at least one selected from the group consisting of polyhydric alcohol, 3-methoxy-3-methylbutanol, and polyoxyethylene alkyl ether, and a buffer can exert a deodorant effect even after the deodorant has dried, and the durability of the deodorant effect of the hydrazide compound (the property of maintaining the deodorant effect even in a dry state) is dramatically improved. The present invention was completed through further research based on this knowledge.

That is, the present invention provides the following aspects.
Item 1. A deodorant comprising (A) a hydrazide compound, (B) at least one member selected from the group consisting of a polyhydric alcohol, 3-methoxy-3-methylbutanol, and a polyoxyethylene alkyl ether, (C) a buffer, and (D) water.
Item 2. The deodorant according to Item 1, further comprising (E) sulfurous acid and/or a salt thereof.
Item 3. The deodorant according to item 1 or 2, which is used by being absorbed into a liquid-absorbent member.
Item 4. The deodorizer according to any one of Items 1 to 3, which is used by spraying or applying to the wall of a space where deodorization is required.
Item 5. A deodorizing method, comprising using the deodorizer according to any one of Items 1 to 4.
Item 6. A deodorant storage section that stores the deodorant according to any one of items 1 to 3,
a deodorant absorbing section that absorbs the deodorant supplied from the deodorant storage section and deodorizes the space;
A deodorizing device having the above structure.
Item 7. The device further includes a deodorant storage section that stores the deodorant supplied from the deodorant storage section,
7. The deodorizing device according to claim 6, wherein the deodorizer suction section is configured to suck up the deodorizer from the deodorizer storage section and absorb the deodorizer.
Item 8. A deodorizing method comprising installing the deodorizing device according to item 6 or 7 in a space where deodorization is required.
Item 9. The deodorizing method according to Item 8, wherein the deodorant liquid-absorbing portion is continuously used even when it becomes dry.
Item 10. A method for improving the durability of the deodorizing effect of a deodorant containing a hydrazide compound, comprising blending (A) the hydrazide compound, (B) at least one selected from the group consisting of a polyhydric alcohol, 3-methoxy-3-methylbutanol, and a polyoxyethylene alkyl ether, (C) a buffering agent, and (D) water into the deodorant.

According to the present invention, it is possible to improve the durability of the deodorizing effect (the property of maintaining the deodorizing effect even in a dry state) in a deodorizer containing a hydrazide compound. Therefore, even if the deodorizer of the present invention is sprayed on a structure in a space where deodorization is required or on a product in the space, the deodorizing function can be maintained in the structure or product, making it possible to effectively remove or mitigate bad odors in the space. Furthermore, when the deodorizer of the present invention is used by being absorbed into a liquid-absorbent member, the deodorizing effect can be maintained even if the volatile components contained in the deodorizing liquid volatilize and the liquid-absorbent member becomes dry.

1 is a schematic diagram showing a cross-sectional view of one embodiment of a deodorization device of the present invention. 1 is a schematic diagram showing a cross-sectional view of one embodiment of a deodorization device of the present invention.

1. Deodorant The deodorant of the present invention is characterized by containing a hydrazide compound (sometimes referred to as component (A)), at least one selected from the group consisting of polyhydric alcohol, 3-methoxy-3-methylbutanol, and polyoxyethylene alkyl ether (sometimes referred to as component (B)), a buffer (sometimes referred to as component (C)), and water (sometimes referred to as component (D)). The deodorant of the present invention will be described in detail below.

[(A) Hydrazide compound]
The deodorant of the present invention contains a hydrazide compound as component (A). A hydrazide compound is a compound that has one or more hydrazide groups (-NH- _NH2 ) in one molecule and has the effect of adsorbing and deodorizing aldehydes (formaldehyde, acetaldehyde, isovaleraldehyde, etc.) that cause bad odors.

The hydrazide compound used in the present invention may be a monohydrazide compound having one hydrazide group per molecule, a dihydrazide compound having two hydrazide groups per molecule, or a polyhydrazide compound having three or more hydrazide groups per molecule.

Specific examples of monohydrazide compounds include acetohydrazide, formhydrazide, carbohydrazide, lauric acid hydrazide, salicylic acid hydrazide, propionic acid hydrazide, p-hydroxybenzoic acid hydrazide, naphthoic acid hydrazide, and 3-hydroxy-2-naphthoic acid hydrazide.

Specific examples of dihydrazide compounds include succinic acid dihydrazide, adipic acid dihydrazide, oxalic acid dihydrazide, malonic acid dihydrazide, glutaric acid dihydrazide, pimelic acid dihydrazide, suberic acid dihydrazide, azelaic acid dihydrazide, sebacic acid dihydrazide, dodecanedioic acid dihydrazide, terephthalic acid dihydrazide, isophthalic acid dihydrazide, tartaric acid dihydrazide, malic acid dihydrazide, iminodiacetic acid dihydrazide, itaconic acid dihydrazide, dodecane dihydrazide, hexadecanedihydrazide, naphthoedihydrazide, benzene dihydrazide, pyridine dihydrazide, cyclohexane dihydrazide, and pyromellitic acid dihydrazide.

Specific examples of polyhydrazide compounds having three or more hydrazide groups in one molecule include citric acid trihydrazide, trinitroacetic acid trihydrazide, nitriloacetic acid trihydrazide, cyclohexanetricarboxylic acid trihydrazide, ethylenediaminetetraacetic acid tetrahydrazide, naphthoic acid tetrahydrazide, polyacrylic acid hydrazide, etc.

These hydrazide compounds may be used alone or in combination of two or more.

Among these hydrazide compounds, from the viewpoint of further improving the durability of the deodorizing effect, dihydrazide compounds are preferred, and succinic acid dihydrazide and adipic acid dihydrazide are more preferred.

The content of component (A) in the deodorant of the present invention may be appropriately set depending on the type of hydrazide compound used, the target to be deodorized, the level of deodorizing effect to be imparted, and the like, but may be, for example, 0.1 to 20% by weight, preferably 0.5 to 10% by weight, and more preferably 1 to 5% by weight.

[(B) Polyhydric alcohol, methoxymethylbutanol, and/or polyoxyethylene alkyl ether]
The deodorant of the present invention contains, as component (B), a polyhydric alcohol, 3-methoxy-3-methylbutanol, and/or a polyoxyethylene alkyl ether.

Among the polyhydric alcohols in component (B), examples include dihydric, dihydric, and tetrahydric alcohols. Specific examples of polyhydric alcohols include dihydric alcohols such as ethylene glycol, propylene glycol, triethylene glycol, diethylene glycol, and isoprene glycol; trihydric alcohols such as glycerin and butanetriol (1,2,3-butanetriol and 1,2,4-butanetriol); and tetrahydric alcohols such as erythritol and pentaerythritol. These polyhydric alcohols may be used alone or in combination of two or more.

Among the (B) components, polyoxyethylene alkyl ether is a compound in which a polyoxyethylene chain is ether-bonded to an alkyl group. The average number of moles of ethylene oxide added to the polyoxyethylene alkyl ether chain is not particularly limited, but may be, for example, 2 to 30, preferably 5 to 20, and more preferably 8 to 12. The alkyl group constituting the polyoxyethylene alkyl ether may be either linear or branched. The number of carbon atoms in the alkyl group constituting the polyoxyethylene alkyl ether is not particularly limited, but may be, for example, 8 to 22, preferably 8 to 14, and more preferably 8 to 10. Specific examples of polyoxyethylene alkyl ether include POE octyl ether, POE isooctyl ether, POE decyl ether, POE isodecyl ether, POE lauryl ether, POE myristyl ether, POE cetyl ether, POE isocetyl ether, POE stearyl ether, POE isostearyl ether, POE arachidyl ether, and POE behenyl ether. Here, "POE" stands for polyoxyethylene, and these polyoxyethylene alkyl ethers may be used alone or in combination of two or more.

In the deodorant of the present invention, component (B) may be one selected from polyhydric alcohols, 3-methoxy-3-methylbutanol, and polyoxyethylene alkyl ethers and used alone, or two or more of these may be used in combination.

Of these (B) components, from the viewpoint of further improving the durability of the deodorizing effect, preferred are ethylene glycol, propylene glycol, triethylene glycol, glycerin, butanetriol, erythritol, pentaerythritol, 3-methoxy-3-methylbutanol, polyoxyethylene isodecyl ether, and polyoxyethylene decyl ether.

The content of component (B) in the deodorant of the present invention may be appropriately set depending on the type of component (B) used, the target to be deodorized, etc., but may be, for example, 0.1 to 20% by weight, preferably 0.5 to 10% by weight, and more preferably 1 to 10% by weight.

In the deodorant of the present invention, the ratio of component (A) to component (B) is, for example, 10 to 1,000 parts by weight, preferably 50 to 500 parts by weight, and more preferably 100 to 400 parts by weight of component (B) per 100 parts by weight of component (A).

[(C) Buffer]
The deodorant of the present invention contains a buffer as component (C). By using components (B) and (C) in combination, the deodorant of the present invention can improve the durability of the deodorant effect of the hydrazide compound even after the deodorant becomes dry.

The type of buffer used in the present invention is not particularly limited, but examples include phosphate buffer, citrate buffer, acetate buffer, tartrate buffer, Tris buffer, etc.

Specific examples of phosphate buffers include phosphoric acid and/or salts thereof. Examples of phosphoric acid salts include dialkali metal hydrogen phosphates such as disodium hydrogen phosphate and dipotassium hydrogen phosphate; alkali metal dihydrogen phosphates such as sodium dihydrogen phosphate and potassium dihydrogen phosphate; and trialkali metal phosphates such as trisodium phosphate and tripotassium phosphate. The phosphoric acid salt may be in the form of a solvate such as a hydrate. As the phosphate buffer, one of phosphoric acid and its salts may be selected and used alone, or two or more of them may be used in combination. Among the phosphate buffers, preferred are phosphates, more preferred are a combination of dialkali metal hydrogen phosphate and alkali metal dihydrogen phosphate, and even more preferred are a combination of disodium hydrogen phosphate and sodium dihydrogen phosphate.

Specific examples of citrate buffers include citric acid and/or salts thereof. Examples of citric acid salts include alkali metal salts such as sodium salts and potassium salts; and alkaline earth metal salts such as calcium salts and magnesium salts. The citric acid salts may be in the form of a solvate such as a hydrate. As a citrate buffer, one of citric acid and its salts may be selected and used alone, or two or more of them may be used in combination. Among phosphate buffers, a combination of citric acid and a citrate salt is preferred, a combination of citric acid and an alkali metal citrate salt is more preferred, and a combination of citric acid and trisodium citrate is even more preferred.

Specific examples of the acetate buffer include acetic acid and/or a salt thereof. Examples of the salt of acetic acid include alkali metal salts such as sodium salt and potassium salt; alkaline earth metal salts such as calcium salt and magnesium salt; and ammonium salt. The salt of acetic acid may also be in the form of a solvate such as a hydrate. As the acetate buffer, one of acetic acid and its salts may be selected and used alone, or two or more of them may be used in combination.

Specific examples of tartaric acid buffers include tartaric acid and/or salts thereof. Examples of salts of tartaric acid include alkali metal salts such as sodium salts and potassium salts; and alkaline earth metal salts such as calcium salts and magnesium salts. The salts of tartaric acid may also be in the form of solvates such as hydrates. As the tartaric acid buffer, one of tartaric acid and its salts may be selected and used alone, or two or more of them may be used in combination.

Specific examples of Tris buffers include trometamol and/or salts thereof. Salts of trometamol are not particularly limited as long as they are pharma- ceutically acceptable, and examples include organic acid salts such as acetates; and organic acid salts such as hydrochlorides and sulfonates. As Tris acid buffers, one of trometamol and its salts may be selected and used alone, or two or more of them may be used in combination.

Among these (C) components, phosphate buffers and citrate buffers are preferred from the viewpoint of further improving the durability of the deodorizing effect.

The content of component (C) in the deodorant of the present invention may be appropriately set depending on the type of component (C) used, the target to be deodorized, etc., but may be, for example, 0.01 to 20% by weight, preferably 0.01 to 10% by weight, and more preferably 0.1 to 5% by weight.

[(D) Water]
The deodorant of the present invention contains water as a base. The content of water in the deodorant of the present invention may be the balance of the components (A) and (B) and other additives added as necessary, and may be, for example, 50% by weight or more, preferably 60 to 99% by weight, and more preferably 70 to 97% by weight.

[(E) Sulfurous acid and/or its salt]
The deodorant of the present invention may contain, in addition to the above components, sulfurous acid and/or a salt thereof (sometimes referred to as component (E)). When the deodorant of the present invention contains component (E), it becomes possible to remarkably improve the durability of the deodorant effect.

Specific examples of nitrites include alkali metal salts such as sodium salts and potassium salts.

In the deodorant of the present invention, one type of sulfurous acid and its salts may be selected and used alone as component (E), or two or more types of these may be used in combination.

Among these (E) components, from the viewpoint of further improving the durability of the deodorizing effect, alkali metal salts of sulfite are preferred, and sodium sulfite is more preferred.

The content of component (E) in the deodorant of the present invention may be appropriately set depending on the type of component (E) used, the target to be deodorized, etc., but may be, for example, 0.1 to 30% by weight, preferably 0.1 to 15% by weight, and more preferably 0.5 to 5% by weight.

In the deodorant of the present invention, the ratio of component (A) to component (E) is, for example, 0.1 to 500 parts by weight, preferably 1 to 250 parts by weight, and more preferably 5 to 100 parts by weight of component (E) per 100 parts by weight of component (A).

[Other ingredients]
In addition to the above-mentioned components, the deodorant of the present invention may contain other additives to the extent that the effects of the present invention are not impaired. Examples of such other additives include other solvents, pH adjusters, preservatives, antibacterial agents, germicides, antioxidants, ultraviolet absorbers, colorants, fragrances, deodorant components other than component (A), surfactants, thickeners, etc.

[pH]
The pH of the deodorant of the present invention may be, for example, 4 to 10, preferably 5 to 9, and more preferably 6 to 8.

[How to use]
The deodorizer of the present invention is used by applying it to spaces or objects where deodorization is required, for example, for the purpose of removing or mitigating bad odors present in indoor spaces, vehicle interiors, pet breeding areas, walls, floors, ceilings, curtains, sofas, bedding, beds, clothing, shoes, leather products, cloth products, storage furniture (shoe boxes, etc.), etc.

To deodorize using the deodorant of the present invention, for example, it is sufficient to place the deodorant in an open container or in a state where the deodorant is absorbed in an absorbent member in the space to be deodorized or near the product to be deodorized. Examples of the absorbent member that absorbs the deodorant of the present invention include fibrous materials such as natural fibers such as cotton, vegetable fibers, and pulp, synthetic fibers such as rayon, polyester, polyethylene terephthalate, polypropylene, and polyethylene, and mixed fibers thereof; wood materials such as wood chips, rattan, bamboo, and sora; and resin sponge materials such as urethane foam. In addition, when the absorbent member is made of a fibrous material, it is preferably a nonwoven fabric, but it may also be a woven fabric, knitted fabric, etc. The shape of the absorbent member may be any of a sheet, rod, string, block, etc.

When the deodorant of the present invention is used by absorbing it into an absorbent member, the deodorant effect continues even if the volatile components (water, etc.) in the deodorant of the present invention evaporate and the absorbent member becomes dry, so the absorbent member in its dry state can be used continuously. The period during which the absorbent member can be used continuously from the point at which it becomes dry varies depending on the composition of the deodorant and the space to be deodorized, but it can be used continuously for about 120 days, preferably about 30 days, from the point at which the absorbent member becomes dry.

In addition, when the deodorant of the present invention is used to deodorize a space (such as an indoor space or a vehicle interior), the deodorant may be directly sprayed onto the space where deodorization is required, but the deodorant may also be sprayed or applied to the structures of the space (walls, floors, ceilings, doors, etc.) or products in the space (curtains, sofas, etc.). In this way, by spraying or applying the deodorant onto the structures of the space or the products in the space, the structures of the space or the products in the space are given a deodorizing function, and the odor in the space is eliminated or alleviated. In this way, when deodorizing a space by giving a deodorizing function to the structures of the space or the products in the space, it is required that the deodorizing effect of the deodorant component attached to the structures or products is sustained, and the deodorant of the present invention has an improved sustained deodorizing effect and satisfies such required characteristics. One preferred embodiment of the deodorant of the present invention is a deodorant that is sprayed or applied onto walls to deodorize an indoor space. In addition, when the deodorant of the present invention is sprayed or applied to structures in a space or products in the space in order to deodorize the space, the structures or products themselves are not the targets of deodorization, so there is no need for them to have a foul odor.

The form of the deodorant of the present invention may be any of spray type, aerosol type, stationary type, wipe sheet type, etc. In the case of spray type or aerosol type, the deodorant of the present invention is contained in a spray container or aerosol container, and the deodorant is sprayed onto the space to be deodorized, the structure of the space, the products in the space, the products to be deodorized, etc. In the case of stationary type, the deodorant of the present invention is contained in a container or absorbed into a liquid-absorbent member so that it can come into contact with the space, and is placed in the space to be deodorized or near the products to be deodorized. In the case of wipe sheet type, the surface of the object to be deodorized may be wiped with a fabric such as a nonwoven fabric impregnated with the deodorant of the present invention. From the viewpoint of ease of use, etc., it is preferable to use the deodorant of the present invention in the form of a spray type, aerosol type, or stationary type.

One embodiment of the deodorant of the present invention when used as a stationary type is a deodorizing device having a deodorant storage section that stores the deodorant of the present invention, and a deodorant liquid absorption section that absorbs the deodorant of the present invention supplied from the deodorant storage section and deodorizes the space.

In the deodorizing device, the means for supplying the deodorizing liquid from the deodorizing liquid storage section to the deodorizing liquid suction section is not particularly limited, and examples thereof include a method of impregnating a part of the deodorizing liquid suction section with the deodorizing liquid in the deodorizing liquid storage section; a method of adding the deodorizing liquid in the deodorizing liquid storage section to the deodorizing liquid suction section; a method of supplying the deodorizing liquid from the deodorizing liquid storage section to a separately provided deodorizing liquid storage section and impregnating a part of the deodorizing liquid suction section with the deodorizing liquid in the deodorizing liquid storage section, and the like.

Examples of the deodorizing device include the deodorizing device shown in FIG. 1 (hereinafter, "first embodiment") and the deodorizing device shown in FIG. 2 (hereinafter, "second embodiment").

The deodorizing device of the first embodiment has a deodorant storage section 1 that stores the deodorant of the present invention, a deodorant storage section 2 that stores the deodorant supplied from the deodorant storage section 1, and a deodorant liquid absorption section 3 that sucks up the deodorant from the deodorant storage section 2 and absorbs the deodorant.

In the deodorizing device of the first embodiment, the deodorant storage section 1 is arranged with its opening facing downwards, and the deodorant is supplied from the opening of the deodorant storage section 1 to the deodorant storage section 2 by gravity. In addition, in the deodorant device of the first embodiment, the opening of the deodorant storage section 1 may be provided with a control valve for controlling the supply speed of the deodorant.

In the first embodiment of the deodorizing device, the deodorant storage section 2 is configured to store the deodorant supplied from the deodorant storage section 1.

In the first embodiment of the deodorizing device, the deodorant absorbing section 3 is arranged so that a part of it is impregnated with the deodorant stored in the deodorant storage section, and is configured to suck up the deodorant and come into contact with the air in the space to be deodorized.

The deodorizing device of the first embodiment may also be provided with an air blowing section that blows air to the deodorant absorbing section 3. By providing such an air blowing section, the deodorant absorbed in the deodorant absorbing section 3 can be efficiently brought into contact with the air in the space, thereby enabling efficient deodorization.

The material of the deodorant storage section 1 in the deodorant device of the first embodiment is not particularly limited and may be made of plastic, glass, ceramic, etc., but is preferably made of plastic.

The material of the deodorant storage section 2 in the deodorant device of the first embodiment is not particularly limited and may be made of plastic, glass, ceramic, etc., but is preferably made of plastic.

The material of the deodorant liquid absorbing part 3 in the deodorant device of the first embodiment is the same as that of the liquid absorbing member, and examples thereof include fibrous materials such as natural fibers such as cotton, vegetable fibers, pulp, etc., synthetic fibers such as rayon, polyester, polyethylene terephthalate, polypropylene, polyethylene, etc., or mixtures thereof; wood materials such as wood chips, rattan, bamboo, and sora; and resin sponge materials such as urethane foam. In addition, when the deodorant liquid absorbing part 3 is made of a fibrous material, it is preferably a nonwoven fabric, but it may also be a woven fabric, knitted fabric, etc. In FIG. 1, the shape of the deodorant liquid absorbing part 3 is sheet-like, but it may also be rod-like, string-like, etc.

The deodorizing device of the second embodiment has a deodorant storage section 1 with an opening, and a deodorant liquid absorbing section 3 that sucks up the deodorant in the storage section and retains the deodorant.

In the second embodiment of the deodorizing device, the deodorant absorbing part 3 is inserted through the opening of the storage part, sucking up the deodorant, and the deodorant absorbing part 3 exposed outside the deodorant storage part deodorizes the space.

The material of the deodorant storage section 1 in the deodorizing device of the second embodiment is not particularly limited and may be made of plastic, glass, ceramic, etc., but is preferably made of plastic.

The material of the deodorant absorbing part 3 in the deodorant device of the second embodiment is not particularly limited as long as it can absorb the deodorant, but examples include fibrous materials such as natural fibers such as cotton, vegetable fibers, pulp, etc., synthetic fibers such as rayon, polyester, polyethylene terephthalate, polypropylene, polyethylene, etc., or mixed fibers thereof; wood materials such as wood chips, rattan, bamboo, and sora; and resin sponge materials such as urethane foam. In addition, when the deodorant absorbing part 3 is made of a fibrous material, it is preferably a nonwoven fabric, but it may also be a woven fabric, knitted fabric, etc. In FIG. 2, the shape of the deodorant absorbing part 3 is sheet-like, but it may also be rod-like, string-like, etc.

The deodorant of the present invention maintains its deodorizing effect even after the volatile components (water, etc.) have evaporated and the deodorant has dried. Therefore, when using the deodorant device of the first and second aspects, even if the volatile components of the deodorant have evaporated from the deodorant absorbing part and the deodorant has dried, the deodorant absorbing part still exerts its deodorizing effect, so the device can be used continuously with the deodorant absorbing part in a dry state without replenishing the deodorant, replacing the deodorant absorbing part, or replacing the deodorant device. The period during which the deodorant absorbing part can be used continuously from the point at which it has dried varies depending on the composition of the deodorant and the space to be deodorized, but can be used continuously for about 120 days, preferably about 30 days, from the point at which the deodorant absorbing part has dried.

2. Method for Improving the Durability of Deodorizing Effect The present invention further relates to a method for improving the durability of the deodorizing effect of a deodorant containing a hydrazide compound, and provides a method for improving durability, comprising blending, into the deodorant, (A) a hydrazide compound, (B) at least one selected from the group consisting of polyhydric alcohols, 3-methoxy-3-methylbutanol, and polyoxyethylene alkyl ethers, (C) a buffering agent, and (D) water.

In the method for improving deodorant durability, the type of component (A), the type of component (B), the type of component (C), the blending amounts of components (A) through (D), other components that may be blended, and the method of using the deodorant are as described in the section "1. Deodorant" above.

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

Test Examples Deodorants having the compositions shown in Tables 1 and 2 were prepared, and the following tests were carried out to evaluate the deodorizing effect of the deodorants in a dried state.

A pleated air purifier filter (19 cm wide, 28 cm long, 1 cm thick; manufactured by Nikki Universal Co., Ltd.) was impregnated with 58.1 g of deodorant and dried at 25°C to prepare a dry deodorant-coated filter.

An air purifier with a deodorant attached filter and a circulator were placed in a glove box with a volume of 1 ^m3 made of an acrylic plate, and the glove box was sealed. Next, 1 L of acetaldehyde with about 10,000 ppm was introduced into the glove box, and the circulator was operated to stir the air in the glove box for 3 minutes. Then, the circulator was stopped, and the acetaldehyde concentration (initial acetaldehyde concentration) in the glove box was measured using a gas detector tube (Acetaldehyde 92M, Gastec Co., Ltd.). Next, after operating the air purifier for 1 hour, the air purifier was stopped, and the acetaldehyde concentration (acetaldehyde concentration after 60 minutes) in the glove box was measured using the gas detector tube. The deodorization rate after 60 minutes was calculated according to the following calculation formula.

The results are shown in Tables 1 and 2. The deodorants containing a hydrazide compound, a polyhydric alcohol, 3-methoxy-3-methylbutanol, or a polyoxyethylene alkyl ether, and a buffer (Examples 1 to 17) had a significantly improved deodorizing rate after 60 minutes compared to the deodorants containing a hydrazide compound and a polyhydric alcohol (Comparative Examples 1 and 2) and the deodorant containing a hydrazide compound and a buffer (Comparative Example 3). In other words, it was revealed that the deodorants containing a hydrazide compound, a polyhydric alcohol, 3-methoxy-3-methylbutanol, or a polyoxyethylene alkyl ether, and a buffer have an excellent deodorizing effect even in a dry state, and the persistence of the deodorizing effect (the property of sustaining the deodorizing effect even in a dry state) is improved.

In addition, although the deodorant containing a hydrazide compound, a polyhydric alcohol, and a sulfite (Comparative Example 1) had a lower deodorizing rate after 60 minutes compared to the deodorant containing a hydrazide compound and a polyhydric alcohol (Comparative Example 1), the deodorant containing a hydrazide compound, a polyhydric alcohol, 3-methoxy-3-methylbutanol or polyoxyethylene alkyl ether, a buffer, and a sulfite (Examples 13 to 17) had a dramatically higher deodorizing rate after 60 minutes. In other words, it was found that by further blending a sulfite in a deodorant containing a hydrazide compound, a polyhydric alcohol, 3-methoxy-3-methylbutanol or polyoxyethylene alkyl ether, and a buffer, the duration of the deodorizing effect (the property of maintaining the deodorizing effect even in a dry state) was significantly improved due to a synergistic effect.

1 Deodorant storage section 2 Deodorant storage section 3 Deodorant liquid absorption section 4 Deodorant

Claims (5)

a deodorant storage section that stores a deodorant containing (A) a hydrazide compound, (B) at least one selected from the group consisting of polyhydric alcohols, 3-methoxy-3-methylbutanol, and polyoxyethylene alkyl ethers having an average number of moles of ethylene oxide added of 5 to 30, (C) a buffer, and (D) water ;
a deodorant absorbing section that absorbs the deodorant supplied from the deodorant storage section and deodorizes the space;
A deodorizing device having the above structure. Further, a deodorant storage section is provided for storing the deodorant supplied from the deodorant storage section,
The deodorizing device according to claim 1 , wherein the deodorant suction section is configured to suck up the deodorant from the deodorant storage section and absorb the deodorant. The deodorizing device according to claim 1 or 2, wherein the deodorizing agent further comprises (E) sulfurous acid and/or a salt thereof. A deodorizing method comprising installing the deodorizing device according to any one of claims 1 to 3 in a space where deodorization is required. The deodorizing method according to claim 4 , wherein the deodorant liquid-absorbing portion is continuously used even when it becomes dry.