JP6435103B2 - How to avoid cockroaches - Google Patents

Description

  The present invention relates to a cockroach repellent method in which an effective repellent effect is exhibited against cockroaches by evaporating an active ingredient.

  Conventionally, menthyl acetate has been used as a food additive as a kind of flavoring agent, and various studies have been made on other uses. For example, it is known that menthyl acetate becomes an active ingredient of a mite-controlling composition (see, for example, Patent Document 1), and has an action to suppress the hatching of fiber insects (see, for example, Patent Document 2). . However, Patent Documents 1 and 2 do not disclose that menthyl acetate is effective in repelling cockroaches.

  On the other hand, repellents used for repelling cockroaches have been studied, including, for example, repellents containing predetermined glycol ethers as active ingredients (see, for example, Patent Document 3) and aliphatic dibasic acid dialkyl esters Repellents (see, for example, Patent Document 4) are known. These conventional repellents exhibit a repellent effect when cockroaches come into contact with the repellent, and a sufficient repellent effect cannot be obtained even when used after transpiration. Therefore, it is necessary to place or apply repellents everywhere, and many of these glycol ethers and aliphatic dibasic acid dialkyl esters have unique odors. On the other hand, there is a problem of giving discomfort due to odor or irritation.

JP-A-5-39203 JP 2001-199807 A JP-A 61-289002 JP-A-8-253403

  An object of the present invention is to provide a method for avoiding cockroaches that exhibits an excellent repellent effect on cockroaches by evaporating the active ingredient, is excellent in safety, and does not give an unpleasant odor and irritation to the user. It is to be.

As a result of intensive studies to solve the above problems, the present inventors have found a solution means having the following configuration, and have completed the present invention.
(1) A method for repelling cockroaches, characterized in that menthyl acetate is transpired so that the amount of transpiration per day is at least 0.05 mg / L with respect to a space intended to repel cockroaches.
(2) The repelling method according to (1), wherein the menthyl acetate is naturally evaporated.
(3) A transpiration-type cockroach repellent containing menthyl acetate as an active ingredient.

  According to the cockroach repellent method of the present invention, an excellent repellent effect on cockroaches is exhibited by evaporating the active ingredient. Therefore, unlike conventional repellents, it does not need to be placed or applied everywhere, and the active ingredient evaporates and exhibits an excellent repellent effect just by installing it at the intended location. The application method is not restricted and it is easy to use. Furthermore, menthyl acetate is a component derived from natural products, has excellent safety, and does not cause the user to feel unpleasant odors or irritation.

It is a schematic diagram explaining one embodiment of the method of forcibly evaporating menthyl acetate. In an Example and a comparative example, it is a schematic diagram which shows the test system used for verification of the repellent effect.

  The cockroach repellent method of the present invention is characterized in that menthyl acetate is transpired so that the amount of transpiration per day is at least 0.05 mg / L in a space where cockroaches are to be repelled. .

  Menthyl acetate is a component derived from a natural product and has a structure of the following general formula (I).

  In this invention, it is a component derived from a natural product, For example, what is obtained by extracting from a plant of the genus mint genus, such as peppermint and Japanese mint, and what is obtained by chemical synthesis can be used. Menthyl acetate is an isomer as acetic acid (-)-menthyl, acetic acid (+)-menthyl, acetic acid (+)-isomentyl, acetic acid (+)-neomenthyl, acetic acid (+)-neoisomentyl, acetic acid (-)-isomentyl. , Acetic acid (−)-neomenthyl and acetic acid (−)-neomenthyl. In the present invention, one or more of these can be used. Among these, acetic acid (-)-menthyl is preferable from the viewpoint of particularly good repellent effect on cockroaches.

  The repellent method of the present invention exerts a repellent effect by causing menthyl acetate to transpire to a space in which cockroaches are to be repelled so that the amount of transpiration per day is at least 0.05 mg / L. . The repellent effect on cockroaches increases with increasing transpiration of menthyl acetate, and once the saturation concentration is reached in the space, the effect is constant even if transpiration continues, so the upper limit of transpiration is deliberately limited Is not to be done. This is because even if the concentration in the space is increased, the repellent effect is not affected, and there is almost no odor or irritation, so that the user is not uncomfortable. However, the upper limit may be limited to, for example, the amount of transpiration that attains a saturated concentration at most in consideration of cost, usage period, usage mode, and the like.

  The amount of transpiration of menthyl acetate per day is not particularly limited as long as it is at least 0.05 mg / L, and it is preferable to evaporate so as to be at least 0.25 mg / L. When the amount of transpiration of menthyl acetate per day is less than 0.05 mg / L, the repellent effect on cockroaches is not sufficiently exhibited, which is not preferable.

  In this invention, well-known dosage forms, such as a powder agent, a gel agent, an aerosol agent, a heat transpiration agent, a pump agent, can be used. Moreover, a well-known method can be employ | adopted for the transpiration | evaporation method, and if it can evaporate so that it may become said transpiration | evaporation amount, even if it is natural transpiration, you may make it evaporate forcibly.

  When evaporating menthyl acetate, it is preferable to use menthyl acetate supported on a carrier because it is easy to use and preserves. Examples of the carrier include paper, pulp, yarn (twisted yarn, etc.), net (net, mesh, etc.), lace, nonwoven fabric, wood, inorganic polymer substance, inorganic porous substance (silicate, silica, zeolite, etc.), Organic polymer substances (cellulose, polyethylene, polypropylene, polyvinyl alcohol, etc.), resins, super absorbent polymers, cotton, sponges, open cell foams, and the like.

  Menthyl acetate can be held on such a carrier by, for example, dripping, dipping, or kneading. Further, when menthyl acetate is held on a carrier, menthyl acetate may be dissolved in a solvent and used. The retention amount of menthyl acetate can be appropriately set in consideration of the duration of the effect, the size of the carrier, the size of the repelling space, and the like. Further, menthyl acetate may be mixed with an excipient and formed into a tablet, granule, powder or the like. In addition to menthyl acetate, the carrier may contain other additives as long as the effects of the present invention are not impaired. Examples of such other additives include fragrances, antioxidants, insecticides, repellents, bactericides, fungicides, deodorants, and pigments.

  In the present invention, when menthyl acetate is spontaneously evaporated, a carrier holding menthyl acetate may be installed in a space where cockroaches are to be avoided, for example, simply placed or suspended. By doing so, menthyl acetate gradually evaporates from the carrier, and the evaporated menthyl acetate spreads in space by riding on the airflow. In the case of transpiration by natural transpiration, it is preferable to install a carrier so that the transcribed menthyl acetate does not accumulate.

  In order to adjust the amount of transpiration, the carrier holding menthyl acetate may be accommodated in a container in which a ventilation hole capable of adjusting the amount of ventilation is formed. Moreover, in order to adjust the transpiration amount, a known solvent can be appropriately selected and used. When a paraffin solvent is used, normal paraffin, isoparaffin, and liquid paraffin can be used. For example, Idemitsu Supersol FP25 (Idemitsu Kosan Co., Ltd., boiling point 150 ° C. or higher), Isopar H (Exxon Mobil Co., Ltd., boiling point 171 ° C. to 187 ° C.), IP Clean HX (Idemitsu Kosan Co., Ltd., boiling point 211 ° C. to 255 ° C.), etc. When the paraffinic solvent is used, the amount of transpiration of menthyl acetate can be increased. On the other hand, Cactus normal paraffin SHLA (JX Nippon Oil & Energy Corporation, boiling point 248 ° C. to 280 ° C.), liquid paraffin thiotech E (Sanko Chemical Co., Ltd., boiling point 260 ° C. to 340 ° C.), liquid paraffin When a high-boiling paraffinic solvent such as 55-S (Sanko Chemical Co., Ltd., boiling point 271 ° C. to 430 ° C.) is used, the transpiration amount of menthyl acetate can be suppressed.

In order to obtain a predetermined transpiration amount in the present invention, for example, a preparation in which 0.1 g to 1 g of menthyl acetate is impregnated with 1 g of a carrier and the carrier is put in a container having an opening of 0.01 cm ² or more, This is achieved by installing one in a space of 10 to 30 L under conditions of a temperature of 20 ° C. to 40 ° C. and a humidity of 30 to 60% RH. When the space for evaporating menthyl acetate is wide, it can be achieved by installing a plurality of the preparations according to the size of the space, or increasing the amount of carrier and the amount of impregnation of menthyl acetate.

  Further, the carrier may be processed into a petal shape, a plant shape, an animal shape, a three-dimensional shape, or a shape having a rich design such as a doll. In addition, after processing a support | carrier, a mentil acetate may be hold | maintained and the support | carrier which hold | maintained the menthyl acetate may be processed.

  Moreover, as a method of forcibly evaporating, the method of using fans, such as a fan, is mentioned, for example. As a method using a fan, for example, as shown in a schematic diagram shown in FIG. 1, a carrier 3 holding menthyl acetate is set in a container 2 provided with a fan 1 so that wind from the fan 1 is applied to the container 2. 2 is a method in which the vapor of menthyl acetate is evaporated from the air vent 2a formed in the fan 2 by the wind of the fan 1.

  Moreover, you may apply the wind by ventilation means, such as an electric fan and an air-conditioner, to the support | carrier which hold | maintained the menthyl acetate. As such a method of use, there is a method in which the carrier processed into a shape rich in design as described above is used by placing it in a position where the fan or air conditioner hits or hanging it from the air outlet of the air conditioner. It is done.

  Furthermore, in order to make menthyl acetate evaporate easily, the method of heating is also mentioned. Examples of such a method include a method of heating a carrier holding menthyl acetate or a filled container to about 40 to 400 ° C. By using the air by the air blowing means or the means for heating, the time for reaching the effective concentration of menthyl acetate can be shortened and the diffusibility is improved, so that it is suitable for use in a wider space.

  The cockroach which becomes the object of the repelling method according to the present invention is not particularly limited, and examples thereof include German cockroaches, black cockroaches, American cockroaches, Japanese cockroaches, and black cockroaches. Among these, particularly excellent repellent effect is exhibited against German cockroaches.

  The repellent method of the present invention has almost no odor or irritation, and does not make the user feel that it is transpiration. Therefore, the repelling method of the present invention is applicable not only to living areas such as living rooms and kitchens, but also to places that dislike the transfer of chemicals such as cupboards, food storage boxes, and food warehouses.

  EXAMPLES Hereinafter, although an Example and a comparative example are given and this invention is demonstrated concretely, this invention is not limited to these Examples.

Example 1
The repellent effect on cockroaches was verified using the test bat shown in FIG. First, 60 German cockroaches (30 males and 30 females) were released on the bat 4 (1 m × 1 m × 25 cm) and left to acclimatize for more than 1 hour. After acclimatization, a water field / solid feed 5 was installed in the vat 4 to allow cockroaches to freely take water and feed. Next, two boxes 6 (35 cm × 25 cm × 25 cm) were installed in the bat 4. The box 6 is made of a transparent vinyl chloride plate on the top surface and a decorative plate on the side and bottom, and has an entrance / exit 61 (1 cm × 5 cm) through which cockroaches enter and exit at one location on the side.
Note that calcium carbonate was applied to the upper part of the inner wall surface of the bat 4 so that cockroaches would not escape. The test was conducted in an open system.

Next, 0.85 g of a pulp mat (3 cm × 3 cm × 0.3 cm) was impregnated with 400 mg of acetic acid (−)-menthyl, and the impregnated pulp mat was sealed with aluminum foil. Using a needle, eight holes of 0.002 cm ² were made in the aluminum foil to obtain specimen A. The obtained specimen A was left in one box 6 (6a), and the other box 6 was set as an untreated section (6b).

One day after the test start date, the number of cockroaches inhabiting in the treated area 6a and the untreated area 6b was confirmed. The repelling rate (%) was calculated from the confirmed number of heads according to the following formula. The test was performed three times with the same procedure (number of repetitions 1 to 3), and the results are shown in Table 1. The test was performed in a room kept at a temperature of about 25 ° C. and a humidity of about 50% RH, and the light / dark cycle was repeated every 12 hours.
Repelling rate (%) = {(number of untreated districts−number of treated districts) / number of untreated districts} × 100

<Method of measuring transpiration amount of acetic acid (-)-menthyl>
The amount of transpiration of acetic acid (-)-menthyl was measured and the amount of transpiration per day was confirmed. One box 6 was placed in the bat 4 and the specimen A was placed in the box 6. The weight of the sample A was measured over time, and the amount of transpiration per day of menthyl acetate was calculated from the reduced weight from 6 days to 18 days later.

(Example 2)
A pulp mat (3 cm × 3 cm × 0.3 cm) 0.85 g was impregnated with 400 mg of acetic acid (−)-menthyl, and the impregnated pulp mat was sealed with aluminum foil. A specimen B was obtained by opening a 1 cm square opening in the aluminum foil.
The repellent effect was verified and the amount of transpiration per day was measured in the same procedure as in Example 1 except that Sample B was used instead of Sample A used in Example 1. The results are shown in Table 1.

(Comparative Example 1)
A pulp mat (3 cm × 3 cm × 0.3 cm) 0.85 g was impregnated with 400 mg of acetic acid (−)-menthyl, and the impregnated pulp mat was wrapped with aluminum foil. Using a needle, three holes of 0.002 cm ² were made in the aluminum foil to obtain specimen C.
The repellent effect was verified and the amount of transpiration per day was measured in the same procedure as in Example 1, except that Sample C was used instead of Sample A used in Example 1. The results are shown in Table 1.

(Comparative Example 2)
A pulp mat (3 cm × 3 cm × 0.3 cm) 0.85 g was impregnated with 400 mg of ethyl cellosolve, which is a kind of glycol ether, and the impregnated pulp mat was sealed with aluminum foil. A sample D was obtained by opening a 1 cm square opening in the aluminum foil.
The repellent effect was verified in the same procedure as in Example 1 except that Sample D was used instead of Sample A used in Example 1. The results are shown in Table 1. Moreover, the amount of transpiration per day was measured by the following method.

<Method of measuring transpiration of ethyl cellosolve>
The amount of transpiration of ethyl cellosolve was measured and the amount of transpiration per day was confirmed. One box 6 was placed in the bat 4 and the specimen D was placed in the box 6. One day later, the weight of the specimen D was weighed, and the amount of transpiration per day of ethyl cellosolve was calculated from the reduced weight.

(Comparative Example 3)
A pulp mat (3 cm × 3 cm × 0.3 cm) 0.85 g was impregnated with 400 mg of dioctyl phthalate, a kind of dibasic acid ester, and the impregnated pulp mat was sealed with aluminum foil. A 1 cm square opening was opened in the aluminum foil, and specimen E was obtained.
The repellent effect was verified and the amount of transpiration per day was measured in the same procedure as in Example 1, except that Sample E was used instead of Sample A used in Example 1. The results are shown in Table 1.

(Comparative Example 4)
A pulp mat (3 cm × 3 cm × 0.3 cm) 0.85 g was impregnated with 400 mg of octanoic acid-p-menthane, and the impregnated pulp mat was sealed with aluminum foil. A 1 cm square opening was opened in the aluminum foil, and a specimen F was obtained.
The repellent effect was verified and the amount of transpiration per day was measured in the same procedure as in Example 1, except that Sample F was used instead of Sample A used in Example 1. The results are shown in Table 1.

As shown in Table 1, when menthyl acetate was transpired at 0.05 mg / L per day, the repellent effect of cockroaches was obtained, and if transpiration was 0.25 mg / L per day, almost 100% A repellent effect was obtained.
On the other hand, it can be seen that ethyl cellosolve (Comparative Example 2), which is a type of glycol ether, does not exhibit any repellent effect despite being evaporated at a high concentration. It can also be seen that dioctyl phthalate (Comparative Example 3) and octanoic acid-p-menthane (Comparative Example 4), which are a kind of dibasic acid ester, do not evaporate and exhibit no repellent effect.

(Formulation example 1)
5 g of zeolite was impregnated with 1 g of a menthyl acetate ethanol solution (50% solution (w / w)) to obtain a powder.

(Formulation example 2)
5 g of aluminum octoate as a gelling agent, 90 g of liquid paraffin and 5 g of menthyl acetate as a solvent were mixed and heated to 60 ° C. for dissolution. Then, it cooled to room temperature and obtained the gel agent.

(Formulation example 3)
10 g of menthyl acetate was dissolved in 90 g of No. 1 kerosene to obtain a chemical solution for heat evaporation.

(Formulation example 4)
A repelling net was obtained by impregnating 0.5 g of menthyl acetate into 3.5 g of a mesh net of 10 cm × 15 cm.

(Formulation example 5)
A repelling net was obtained by kneading 0.5 g of menthyl acetate into 3.5 g of resin to prepare a net.

(Formulation Example 6)
1 g of menthyl acetate was impregnated into 3 g of a pulp molded into a honeycomb shape having a length of 6 cm, a width of 6 cm, and a height of 1 cm to obtain a drug-impregnated body for blowing air.

(Formulation example 7)
An aerosol stock solution was prepared by mixing 5 g of menthyl acetate and 20 g of ethanol. An aerosol can was obtained by pressurizing and filling an aerosol can with 25 g of the obtained aerosol stock solution and 25 g of LPG (3.5 kg / m ³ ).

(Formulation Example 8)
1 g of menthyl acetate, 8.99 g of azodicarbonamide as a foaming agent, 0.01 g of starch and water as a binder were mixed, granulated with a granulator, and dried to obtain granules for heat evaporation.

DESCRIPTION OF SYMBOLS 1 Fan 2 Container 2a Vent 3 Carrier 4 Bat 5 Water field / solid feed 6 Box 6a Treated area 6b Untreated area 61 Entrance / exit

Claims (2)

Only menthyl acetate as an active ingredient is put in a container provided with an opening of 0.01 to 1 cm ² , and one container is installed in a space 10 to 30 L in which cockroaches are to be repelled to try to repel cockroaches. A method for avoiding cockroaches, characterized in that menthyl acetate is evaporated to a space such that the amount of transpiration per day is 0.05 to 0.25 mg / L.   The repellent method according to claim 1, wherein the menthyl acetate is naturally evaporated.

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