JP7406201B2 - Rubber odor modulator, rubber odor modulation method, and rubber odor modulation device - Google Patents

Description

The present invention relates to a rubber odor modulator, a rubber odor modulation method, and a rubber odor modulation device.

Conventionally, in order to alleviate the putrid and pungent odors that occur when rubber such as natural rubber is used in various rubber products such as tires, technology has been known in which fragrances, in particular, specific fragrance components, are used as masking agents. ing.
For example, Patent Document 1 listed below discloses a rubber composition containing a fragrance, and discloses that the fragrance in the rubber composition relieves the odor peculiar to the rubber composition by generating a fragrance.

JP2019-99718A

However, the technique described in Patent Document 1 is not sufficiently effective in reducing the odor peculiar to rubber such as natural rubber, and there is still room for improvement.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a rubber odor modulator that can solve the problems of the prior art described above and effectively reduce rubber odor.
A further object of the present invention is to provide a rubber odor modulation method and a rubber odor modulation device that can effectively reduce rubber odor.

The gist of the present invention for solving the above problems is as follows.

The rubber odor modifier of the present invention is characterized by containing a woody-spicy aroma component.
The rubber odor modifier of the present invention can effectively reduce rubber odor.

Preferably, the rubber odor modifier of the present invention has a sensory deodorizing effect on odors containing formic acid, n-valeric acid, trimethylamine, and 2-pyrrolidone. In this case, it becomes possible to reduce rubber odor more effectively.

The rubber odor modifier of the present invention preferably contains at least one member selected from the first group consisting of juniper berry oil and estragon oil. In this case, it becomes easier to form a spicy aroma, and it becomes possible to more effectively reduce rubber odor.

The rubber odor modifier of the present invention preferably contains at least one member selected from the second group consisting of cinnamon cassia, pink pepper extract, and black pepper extract. In this case as well, it becomes easier to form a spicy aroma, and it becomes possible to more effectively reduce the rubber odor.

The rubber odor modifier of the present invention preferably contains at least one member selected from the third group consisting of vanillin and cypress extract. In this case, it becomes easier to form a woody scent, and it becomes possible to more effectively reduce rubber odor.

The method of modulating rubber odor of the present invention is characterized by using the above modulating agent. The rubber odor modulation method of the present invention can effectively reduce rubber odor.

The rubber odor modulating device of the present invention is characterized by having the above-mentioned rubber odor modulating agent and comprising a spraying means for spraying the rubber odor modulating agent. The rubber odor modulation device of the present invention can effectively reduce rubber odor.

According to the present invention, it is possible to provide a rubber odor modulator that can effectively reduce rubber odor.
Further, according to the present invention, it is possible to provide a rubber odor modulation method and a rubber odor modulation device that can effectively reduce rubber odor.

It is a graph showing the evaluation results of the odor intensity of a simulated odor of natural rubber odor and a sample for examining contributing substances. It is a graph showing the evaluation results of the pleasantness and unpleasantness of a simulated natural rubber odor and a sample for examining contributing substances. It is a graph showing the evaluation results of the unacceptable rate of a simulated natural rubber odor and a sample for examining contributing substances. It is a graph showing the evaluation results of odor quality of a simulated natural rubber odor and a sample for examining contributing substances. 1 is a graph showing the evaluation results of odor intensity of a simulated natural rubber odor, a sample using a commercially available deodorant, and odor samples of Examples 1 to 3. 1 is a graph showing the evaluation results of the pleasantness and unpleasantness of a simulated natural rubber odor, a sample using a commercially available deodorant, and odor samples of Examples 1 to 3. 2 is a graph showing the evaluation results of the unacceptable rate of a simulated natural rubber odor, a sample using a commercially available deodorant, and odor samples of Examples 1 to 3. 1 is a graph showing evaluation results of odor quality of a simulated natural rubber odor, a sample using a commercially available deodorant, and an odor sample of Example 1.

EMBODIMENT OF THE INVENTION Below, the rubber odor modulator, the rubber odor modulation method, and the rubber odor modulation apparatus of this invention will be illustrated and explained in detail based on the embodiment.

<Rubber odor modulator>
The rubber odor modifier of the present invention is characterized by containing a woody-spicy aroma component.
Here, the term "modulator" refers to a substance that is mixed with a target odor to modulate the target odor to alleviate discomfort. This phenomenon is also called sensory deodorization.

The present inventors have intensively studied the odor components of natural rubber, which has particularly strong putrid and irritating odors among rubbers. It is known that formic acid, n-valeric acid, trimethylamine, and 2-pyrrolidone are the main causes of odor in natural rubber. A simulated odor of natural rubber consisting of It has been found that grass acid, particularly n-valeric acid, has a large effect on unpleasant odor.
Based on this knowledge, the present inventors further investigated and found that when a modulator containing a woody/spicy aroma component was added to a simulated natural rubber odor, the unpleasantness of the rubber odor was significantly increased. It has been found that rubber odor can be effectively reduced.
The mechanism by which woody-spicy aroma components greatly alleviate the unpleasantness of rubber odors is not necessarily clear, and we do not wish to be bound by theory, but among the rubber odors, the aforementioned formic acid and n-valeric acid It is believed that the odors of , trimethylamine, and 2-pyrrolidone, particularly formic acid and n-valeric acid, are combined with woody-spicy aroma components to alleviate the unpleasantness of these odors.
Therefore, according to the rubber odor modifier of the present invention containing a woody-spicy aroma component, rubber odor can be effectively reduced.

As mentioned above, among rubbers, the main causes of odor components in natural rubber, which have a particularly strong putrid odor and pungent odor, are formic acid, n-valeric acid, trimethylamine, and 2-pyrrolidone. Preferably, the rubber odor modifier has a sensory deodorizing effect on odors including formic acid, n-valeric acid, trimethylamine, and 2-pyrrolidone. The modulator has a sensory deodorizing effect on odors containing formic acid, n-valeric acid, trimethylamine, and 2-pyrrolidone, thereby reducing the unpleasantness of odors containing formic acid, n-valeric acid, trimethylamine, and 2-pyrrolidone. This makes it possible to more effectively reduce rubber odor.

The rubber odor modifier of the present invention is characterized by containing a woody-spicy aroma component, and such a woody-spicy aroma component can be prepared by appropriately blending various perfumes. The content of the fragrance in the modulator depends on the intensity of the fragrance of the fragrance used, but is usually preferably in the range of 1 to 50% by weight, more preferably in the range of 5 to 20% by weight.

The rubber odor modifier of the present invention preferably contains at least one member selected from the first group consisting of juniper berry oil, linalyl acetate, and estragon oil. When the modulator contains at least one selected from the first group, it becomes easier to form a spicy aroma, and it becomes possible to more effectively reduce rubber odor. The substances selected from the first group may be used alone or in combination of two or more.
The content of the substance selected from the first group in the rubber odor modifier of the present invention (or the total content when it contains a plurality of substances) is preferably in the range of 1 to 20% by mass, and 2% by mass. A range of 15% by weight is more preferred, and a range of 3% to 10% by weight is particularly preferred.

The rubber odor modifier of the present invention preferably contains at least one member selected from the second group consisting of cinnamon cassia (also referred to as "Cinnamon cassia"), pink pepper extract, and black pepper extract. When the modulator contains at least one selected from the second group, it becomes easier to form a spicy aroma, and it becomes possible to more effectively reduce rubber odor. The substances selected from the second group may be used alone or in combination of two or more.
The content of the substance selected from the second group in the rubber odor modifier of the present invention (or the total content if it contains a plurality of substances) is preferably in the range of 0.1 to 10% by mass. , a range of 0.5 to 5% by mass is more preferred, and a range of 0.7 to 3% by mass is particularly preferred.

The rubber odor modifier of the present invention preferably contains at least one member selected from the third group consisting of vanillin and cypress extract. When the modulator contains at least one selected from the third group, it becomes easier to form a woody scent, and it becomes possible to more effectively reduce rubber odor. The substances selected from the third group may be used alone or in combination of two types.
The content of the substance selected from the third group in the rubber odor modifier of the present invention (or the total content if it contains a plurality of substances) is preferably in the range of 0.5 to 15% by mass. , a range of 1 to 8% by weight is more preferable, and a range of 1.5 to 5% by weight is particularly preferable.

The rubber odor modifier of the present invention includes at least one selected from the first group, at least one selected from the second group, and at least one selected from the third group. It is particularly preferable to include the following. When the modulator includes at least one selected from the first group, at least one selected from the second group, and at least one selected from the third group, A woody/spicy scent is particularly easy to form, and rubber odor can be reduced even more effectively.
Here, the mass ratio of the substance selected from the first group, the substance selected from the second group, and the substance selected from the third group (first group: second group: The third group) preferably has a ratio of 3 to 5:1:1 to 3, based on the substance selected from the second group.

As mentioned above, a woody/spicy aroma component can be prepared by appropriately blending various fragrances, but in the rubber odor modifier of the present invention, a fragrance containing a woody/spicy aroma component alone can be prepared. , may be used alone.
Here, examples of fragrances containing spicy aroma components include β-caryophyllene, cinnamaldehyde, cumin aldehyde, eugenol, isoeugenol, perillaldehyde, cardamom oil, clove oil, ginger extract, black pepper extract, and bergamot extract. , cinnamon extract, nutmeg extract, clove extract, etc.
Fragrances containing woody aroma components include amber core, amber extreme, ambroxan, bakudanol, cedranbar, sedanol, evanol, hingenol, hinokitiol, javanol, norinbanol dextro, oscillol, patchhon, polyambrol, α - Pinene, β-pinene, Sandalore core, Sandalore, Santarex T, Orbitone, cedarwood oil, patchouli oil, sandalwood oil, vetiver oil, cypress extract, vetiver extract, ivy leaf extract, etc.
Furthermore, the fragrance containing the above-mentioned spicy-like aroma component and the fragrance containing the woody-like aroma component may be mixed and adjusted to form a woody-spicy aroma component.

The rubber odor modifier of the present invention may contain a diluent (solvent) in order to soften the odor intensity of the perfume component. The diluent includes dipropylene glycol (DPG), liquid paraffin, ethanol, propylene glycol, 1,2-butylene glycol, glycerol, diethylene glycol monoethyl ether, diethyl phthalate, isopropyl myristate, triethyl citrate, benzyl benzoate, benzyl Examples include acetate, and among these, dipropylene glycol (DPG) is preferred. These diluents may be used alone or in combination of two or more.
When a diluent is included, the content of the diluent in the modulator is preferably in the range of 50 to 99% by mass, more preferably in the range of 80 to 95% by mass.

The rubber odor modifier of the present invention may contain additives in addition to the above-mentioned perfume and diluent (solvent) depending on the purpose. Such additives include antioxidants and the like.

As mentioned above, the rubber odor modifier of the present invention can effectively reduce the odor of natural rubber, which has particularly strong putrid and irritating odors among rubbers. Therefore, the rubber odor modifier of the present invention can be used to reduce the odor of various rubbers in addition to natural rubber.

<How to modulate rubber odor>
The rubber odor modulating method of the present invention is characterized by using the above-mentioned rubber odor modulating agent. In the rubber odor modulation method of the present invention, the use of the above-mentioned modulating agent makes it possible to effectively reduce rubber odor.
The manner in which the modulator is used is not particularly limited, and in one embodiment, the modulator is brought into contact with a gas or liquid containing a rubber odor to reduce the rubber odor. For example, by spraying a modulator at the exhaust vents, chimneys, etc. of a factory where rubber odor is emitted, it becomes possible to effectively reduce the unpleasant feeling of rubber odor.
Further, the rubber odor can be reduced by allowing the gas containing the rubber odor to pass through a bath containing the modulating agent, thereby bringing the gas containing the rubber odor into contact with the modulating agent.
Further, the rubber odor can also be reduced by filling a scrubber with the modulator as a cleaning liquid and allowing gas having a rubber odor to pass through the scrubber.

<Rubber odor modulation device>
The rubber odor modulating device of the present invention is characterized by having the above-mentioned rubber odor modulating agent and comprising a spraying means for spraying the modulating agent. According to the rubber odor modulating device of the present invention, the rubber odor can be reduced by spraying the above-mentioned modulating agent to the rubber odor. The rubber odor modulating device includes the rubber odor modulating agent, and for example, the modulating agent can be housed in a container, and the container can be placed at any position in the modulating device.
Further, the spraying means is not particularly limited, and examples thereof include spraying, showering, and the like.
The rubber odor modulation device may further include other components, such as a flow path connecting a container containing the modifier and the spraying means, and a flow path that connects the spraying means to the container containing the modulating agent, and adjusting the amount of the modulation agent sprayed from the spraying means. Examples include control means (flow rate regulator, temperature regulator, etc.) for controlling.

EXAMPLES The present invention will be described in more detail below with reference to Examples, but the present invention is not limited to the Examples below.

<1. Examination of substances contributing to rubber odor>
(1) Preparation of a simulated natural rubber odor Formic acid, n-valeric acid, trimethylamine, and 2-pyrrolidone are known as odor components of natural rubber that have particularly strong putrid and pungent odors. The contribution of each chemical substance to odor was examined.
First, an odor composition having the formulation shown in Table 1 was prepared. Since the odor composition had too strong an odor, the odor composition was diluted 10 times with liquid paraffin and adjusted to an odor intensity of 3 to create a simulated odor of natural rubber odor.

(2) Preparation of sample for contributing substance examination Prepare a sample by removing one substance from the substances used to create the above simulated odor, dilute it with liquid paraffin in the same way as for the above simulated odor, and prepare a sample for contributing substance examination. Created.

(3) Evaluation of odor intensity, pleasantness/displeasure, acceptability, odor quality A simulated natural rubber odor whose odor intensity was adjusted and a sample for examining each contributing substance were attached to odor paper, and the odor intensity The panel was asked to evaluate the level of pleasantness/discomfort, acceptability, and odor quality.
For each evaluation, the panel consisted of 26 men and women aged 18 to 19 who passed the panel selection test.
FIG. 1 shows the evaluation results of the odor intensity of a simulated natural rubber odor and a sample for examining contributing substances.
Furthermore, FIG. 2 shows the evaluation results of the pleasantness and unpleasantness of the simulated natural rubber odor and the sample for examining contributing substances.
Further, FIG. 3 shows the evaluation results of the unacceptable rate of the simulated natural rubber odor and the sample for examining contributing substances.
Furthermore, FIG. 4 shows the evaluation results of the odor quality of the simulated natural rubber odor and the sample for examining contributing substances.

From FIG. 1, it can be seen that by removing n-valeric acid, the odor intensity is reduced by one step or more.
Moreover, from FIG. 2, it can be seen that by removing formic acid or n-valeric acid, the discomfort level is improved by one level or more.
From these results, it can be seen that n-valeric acid has the highest contribution to the simulated natural rubber odor in terms of odor intensity and pleasantness/discomfort, and has an especially large contribution to the odor intensity and unpleasantness of natural rubber odor. .

Furthermore, from FIG. 3, it can be seen that by removing formic acid or n-valeric acid from the simulated natural rubber odor, the unacceptable rate is reduced to around 25%. This result shows that formic acid and n-valeric acid, even in the non-acceptable state, have a particularly high contribution to the simulated natural rubber odor.

Furthermore, from FIG. 4, it can be seen that the quality of the odor is different between the sample from which formic acid or n-valeric acid is removed and the sample from which trimethylamine or 2-pyrrolidone is removed.
In particular, if formic acid or n-valeric acid is removed, unpleasant evaluations such as irritating odor, isovaleric acid, putrid odor, and fecal odor will be reduced. It can be seen that the quality of the odor, in particular, the contribution to unpleasant odors such as pungent odor, isovaleric acid odor, rotten odor, and feces odor among simulated odors is also large.

<2. Sensory deodorization experiment>
(1) Preparation of odor samples Odor samples having the formulation shown in Table 2 were prepared, and a sensory deodorization experiment of the above-mentioned simulated natural rubber odor was conducted.
In order to match the ratio of the simulated natural rubber odor contained in each odor sample to the strength-adjusted simulated natural rubber odor for comparison, samples were prepared with a ratio of 10.0% simulated odor and 90.0% fragrance. . Of these, 90.0% of the fragrances corresponded to modulators, and all of them had mainly spicy fragrances and, to a lesser extent, also had woody fragrances.
Here, "ratio" means "mass ratio".

*1 Natural rubber simulating odor composition: Composition with the formulation shown in Table 1 *2 Juniper berry oil: Juniper berry oil diluted with dipropylene glycol (DPG) at a concentration of 10% by mass *3 Linalyl acetate: Linalyl Acetate diluted in dipropylene glycol (DPG) at a concentration of 10% by mass *4 Estragon oil: Estragon oil diluted in dipropylene glycol (DPG) at a concentration of 10% by mass *5 Cinnamon Cassia: Cinnamon Cassia diluted in dipropylene glycol (DPG) at a concentration of 10% by mass *6 Pink pepper extract: Pink pepper extract diluted in dipropylene glycol (DPG) at a concentration of 10% by mass *7 Black pepper extract: Black pepper extract diluted in dipropylene glycol (DPG) at a concentration of 10% by mass *8 Vanillin: Vanillin diluted in dipropylene glycol (DPG) at a concentration of 10% by mass *9 Cypress extract: Cypress extract diluted with dipropylene glycol (DPG) at a concentration of 10% by mass.

(2) Evaluation of odor intensity, pleasantness/displeasure, acceptability, odor quality A simulated natural rubber odor whose odor intensity was adjusted, and each odor sample prepared using the simulated natural rubber odor. A sensory evaluation experiment was conducted on odor samples prepared using a commercially available deodorant (manufactured by Shikibo Co., Ltd., trade name "Deomagic"). Each sample was attached to a piece of odor paper, and the panel was asked to evaluate odor intensity, pleasantness/displeasure, acceptability, and quality of the odor, and was also asked to freely describe what they felt from the odor.
In each evaluation, the panel consisted of 25 men and women aged 18 to 19 who passed the panel selection test.
FIG. 5 shows the evaluation results of odor intensity of a simulated natural rubber odor, a sample using a commercially available deodorant, and odor samples of Examples 1 to 3.
Furthermore, FIG. 6 shows the evaluation results of the pleasantness and unpleasantness of the simulated natural rubber odor, the sample using a commercially available deodorant, and the odor samples of Examples 1 to 3.
Furthermore, FIG. 7 shows the evaluation results of the unacceptable rate for the simulated natural rubber odor, the sample using a commercially available deodorant, and the odor samples of Examples 1 to 3.
Further, FIG. 8 shows the odor quality evaluation results of a simulated natural rubber odor, a sample using a commercially available deodorant, and the odor sample of Example 1.

From FIG. 6, it can be seen that the unpleasantness level of the odor samples of Examples 1 to 3 is improved by one level or more compared to the simulated natural rubber odor whose odor intensity is adjusted. Further, the odor samples of Examples 1 to 3 met the criteria of the Aromatic Deodorant Deodorant Association.
Furthermore, from FIG. 7, it can be seen that the unacceptable rate of the odor samples of Examples 1 to 3 is reduced to about 20%, and it can be seen that the odor samples can be improved to the standard of the unacceptable rate of 20% or less, which is the odor standard of the Architectural Institute of Japan.
These results show that the rubber odor modulator according to the present invention is effective in reducing the degree of pleasantness and unpleasantness of the simulated natural rubber odor, as well as in reducing the unacceptable rate.

In addition, from Figure 8, when comparing the simulated natural rubber odor with the odor sample of Example 1, which was highly effective in terms of pleasantness and unpleasantness, the odor quality changed from that of a bad odor to that of an exhilarating feeling. The odor quality was improved.
In particular, the odor sample of Example 1 had less unpleasant evaluations such as irritating odor, isovaleric acid, putrid odor, and fecal odor, indicating that the effects of formic acid and n-valeric acid mentioned above were alleviated.

(3) Classification of free descriptions by panelists Furthermore, free descriptions by panelists were classified into edible expressions such as ``sweets'' and ``nuts,'' and natural expressions such as ``floral'' and ``woody.'' The results are shown in Table 3.

As shown in Table 3, in the sample using a commercially available deodorant, there were few natural expressions and many edible expressions, whereas in the sample of Example 1, there were edible expressions and natural expressions. It was found that expressions were seen to the same extent, but the characteristics were different. In particular, the odor samples of Example 1 had many natural expressions, indicating that the rubber odor modifier according to the present invention is effective in making exhaust air from factories feel natural. I understand.

The modulator of the present invention can be used to reduce rubber odor.

Claims (4)

A rubber odor modifier containing a woody and spicy aroma component,
At least one species selected from the first group consisting of juniper berry oil and estragon oil,
At least one species selected from the second group consisting of cinnamon cassia, pink pepper extract, and black pepper extract;
A rubber odor modulator, comprising at least one member selected from the third group consisting of vanillin and cypress extract . The rubber odor modifier according to claim 1, which has a sensory deodorizing effect on odors containing formic acid, n-valeric acid, trimethylamine, and 2-pyrrolidone. A method for modulating rubber odor, comprising using the rubber odor modulator according to claim 1 or 2 . A rubber odor modulating device comprising the rubber odor modulating agent according to claim 1 or 2 , and comprising a spraying means for spraying the rubber odor modulating agent.

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