JP2015218118A - Pest insect repellent - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pest insect repellent capable of effectively repelling mites and termites, achieving both of improved usability and reduced costs.SOLUTION: The pest insect repellent for repelling specific kinds of pest insects includes a pest insect repelling liquid mainly composed of a vetiver root extract and a substrate for retaining the pest insect repelling liquid. The extract includes at least one of a water-soluble extract obtained by autoclave extraction of the dried vetiver plant root immersed in water, a water-soluble extract obtained by hot water extraction of the dried vetiver plant root immersed in water, and a water-soluble extract obtained by alcohol extract of the dried vetiver plant root. The specific kinds of pest insects include mites and termites.

Description

  The present invention relates to a pest repellent capable of repelling pests that damage humans and other animals, or structures such as houses or furniture.

  In modern society, there are various pests such as mites and white ants. For example, ticks may cause physiological damage to the human body by attaching to the human body and sucking blood or injecting venom. In addition, ticks can cause similar physiological damage not only to the human body but also to pets. In addition, white ants may damage structures such as corroding building materials.

  Of course, ticks and the like can also contaminate clothes and cause damage to not only human bodies and pets, but also various items. White ants also have the problem of causing physiological damage by biting the human body and pets in some cases.

  That is, ticks and white ants cause physiological damage to human bodies and pets, and also damage structures such as houses. It is undesirable for humans and structures to leave these pests unattended.

  Under such circumstances, pest repellents have been developed to repel pests that cause damage to humans and other animals, such as mites and white ants, or structures such as houses or furniture.

  As such a pest repellent, Patent Document 1 described later discloses a method for repelling white ants using sodium chloride.

  That is, a saline solution having a concentration of 11.3% is prepared in advance, and the target wood material is immersed in the saline solution for 5 days, so that the salt solution penetrates into the wood material. The wood material is taken out from the saline solution and naturally dried indoors for 8 days to obtain a wood material impregnated with salt inside. Then, a structure is constructed using the obtained wood material.

  In such a wood material, the salt damage of the wood material by white ants could be prevented by sodium chloride as salt.

  Patent Document 2 described later includes a radioactive mineral containing one or more ceramics selected from alumina, silica, zirconyl and zircon, and a natural radioactive element such as cerium, rubidium, neodymium, lanthanum or thorium. A white ant repellent containing ceramic fine powder obtained by blend sintering as an active ingredient is disclosed.

  In such a white ant repellent, β-rays radiated from radioactive minerals react with ceramics, water and carbon dioxide to generate negative ions, and the synergistic action of these negative ions and β-rays provides a good repellent against white ants. Demonstrate the effect.

Japanese Patent Laid-Open No. 2004-230642 JP-A-2005-119981

  However, in the white ant repellent disclosed in Patent Document 1, since the object must be impregnated with sodium chloride, it is applied after the fact to finished products such as furniture and houses. There was a problem that I could not. In addition, since a relatively high concentration of salt is impregnated in the wood material, a rust metal material such as iron cannot be used for the wood material.

  Moreover, the white ant repellent disclosed by patent document 1 can repel a white ant by impregnating the building material which is a target object with sodium chloride. However, the repellent effect of sodium chloride fades with time. After thinning, it is difficult to later impregnate sodium chloride with building materials, and it is difficult to maintain the repellent effect for a long time.

  Moreover, it is difficult to produce a repellent effect in a manifestation or place where it is difficult to soak in sodium chloride. In such a situation, there is also a problem that it is difficult to avoid in order to suppress damage to living bodies such as human bodies and pets by white ants.

  On the other hand, since the white ant repellent disclosed in Patent Document 2 contains radioactive minerals, there is a fear that it may cause health damage and cannot be used in general households.

  In view of the above-described problems, an object of the present invention is to provide a pest repellent that can effectively repel mites and white ants, and at the same time achieves both ease of use and cost reduction.

The pest repellent of the present invention is a pest repellent that repels specific types of pests,
A pest repellent solution composed mainly of vetiver root extract;
A substrate containing the pest repellent solution,
The extract is
Water-soluble extract obtained by soaking dried vetiver plant roots in water and autoclaving extraction, water-soluble extract obtained by soaking dried vetiver plant roots in water and hot water extraction, and dried Including at least one water-soluble extract obtained by alcohol extraction of roots of vetiver plants,
The specific types of pests include mites and white ants.

  The pest repellent of the present invention can effectively repel pests such as mites and white ants. In particular, tick and white ants that can cause physiological damage to human bodies and pets can be avoided, so that the comfort of residents can be maintained.

  In addition, the pest repellent of the present invention can repel mites and white ants that adversely affect the structure, so that damage to the structure by pests can be suppressed.

  In addition, the pest repellent of the present invention can be installed at a necessary place after the fact. For this reason, it is convenient. In addition to being able to be installed in a necessary place after the fact, since the material of natural origin is used, the cost can be kept low. Furthermore, since the pest repellent component is wrapped by the hydrous substrate, the pest repellent effect is likely to last for a long time. Of course, if the effect diminishes, you only have to replace it, so this is also convenient.

  Moreover, the pest repellent using the same vetiver root was difficult to realize the effect because it was the root itself or only sprayed with the extract. In the pest repellent of the present invention, since the pest repellent component is wrapped by the water-containing substrate, the pest repellent component can be released at the installation site for a long time. As a result, the pest repellent can reliably repel pests such as mites and white ants.

It is a schematic diagram of the pest repellent in the embodiment of the present invention. It is a flowchart of the manufacturing process of the pest repellent liquid in embodiment of this invention. It is a schematic diagram which shows the state of the experiment 1 of this invention. Experiment 1 was conducted in this manner. It is a photograph which shows the experimental state in Experiment 1 of this invention. It is a table | surface which shows the experimental result of the experiment 1 of this invention. 10 is a table showing experimental results of Comparative Example 2. It is a photograph which shows the state of the experiment 2 of this invention. It is a table | surface which shows the result of the experiment 2 of this invention.

The pest repellent according to the first invention of the present invention is a pest repellent that repels specific types of pests,
A pest repellent solution composed mainly of vetiver root extract;
A substrate containing the pest repellent solution,
The extract is
Water-soluble extract obtained by soaking dried vetiver plant roots in water and autoclaving extraction, water-soluble extract obtained by soaking dried vetiver plant roots in water and hot water extraction, and dried Including at least one water-soluble extract obtained by alcohol extraction of roots of vetiver plants,
The specific types of pests include mites and white ants.

  With this configuration, the pest repellent can slowly release the pest repellent component to the outside air over a long period of time.

  In the pest repellent according to the second invention of the present invention, in addition to the first invention, the ticks are a gourd mite.

  With this configuration, the pest repellent can repel mite leopard mites that are small and collectively act to damage human bodies and buildings.

  In the pest repellent according to the third aspect of the present invention, in addition to the first aspect, the white ants are termites.

  With this configuration, the pest repellent can repel the termites that are small and collectively act to damage human bodies and buildings.

  In the pest repellent according to the fourth invention of the present invention, in addition to any of the first to third inventions, the substrate causes the pest repellent liquid containing water to evaporate to the outside air.

  With this configuration, the pest repellent can release the pest repellent component to the outside air for a long period of time. As a result, the insect pest repellent function can be exhibited over a long period of time.

  In the pest repellent according to the fifth aspect of the present invention, in addition to any one of the first to fourth aspects, the substrate is substantially spherical or substantially elliptical.

  With this configuration, the pest repellent is easily placed at the target installation location.

  In addition to any one of the first to fifth inventions, the pest repellent according to the sixth invention of the present invention is formed of a crosslinked sodium polyacrylate.

  With this configuration, the substrate can contain a pest repellent liquid that is a liquid as a polymer resin, and the transpiration of the pest repellent liquid can be realized.

  In the pest repellent according to the seventh invention of the present invention, in addition to any of the first to sixth inventions, when the pest repellent liquid containing water decreases, the substrate contracts in accordance with the decrease.

  With this configuration, it is possible to easily grasp the replacement time of the pest repellent.

  In addition to the seventh invention, the pest repellent according to the eighth invention of the present invention includes an outer wall that releases the pest repellent solution that evaporates, and the outer wall contracts in accordance with the contraction of the substrate.

  With this configuration, the strength of the insect repellent can be increased.

  In the pest repellent according to the ninth invention of the present invention, in addition to any one of the first to eighth inventions, the autoclave extraction is performed at 100 ° C. to 125 ° C. for 30 to 40 minutes. Extraction is carried out at 50 ° C. to 65 ° C. for 1-2 hours.

  With this configuration, the extract can be obtained efficiently.

  In the pest repellent according to the tenth invention of the present invention, in addition to any of the first to ninth inventions, the pest repellent contains an inhibitor that suppresses the odor of the extract of vetiver root.

  With this configuration, usability and comfort for residents and the like can be improved.

  In the pest repellent according to the eleventh aspect of the present invention, in addition to the tenth aspect, the inhibitor is mint extract or limonene.

  With this configuration, the freshness of the pest repellent can be improved.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(Embodiment)

(Description of reference technology)
Vetiver (scientific name “Veteveria zizanides”) is a perennial plant of the grass family native to India. A vetiver root extract is obtained from the dried vetiver obtained by drying the vetiver roots.

  Here, a pest repellent utilizing vetiver roots has also been proposed as a reference technique. The proposed pest repellent utilizing the roots of vetiver has the following form.

(Part 1)
As one form, a cut product obtained by cutting a dried vetiver root is used as a pest repellent as it is. In the case of this form 1, there is an advantage that it is only necessary to install a cut material of a dried vetiver root.

  However, vetiver root cuts have the disadvantage of requiring a place to install. In addition, the cut material looks like a root of a tree as it is, so it looks bad. There is a possibility of being cleaned by residents who do not notice it as a pest repellent.

  In addition, the dried vetiver root has the effect of repelling pests, but this effect cannot be fully exhibited in the state of the dried root. This is because the dried roots of vetiver also contain components other than the component that exhibits the effect of repelling pests, and the effect of repelling pests is diminished when these components are exhibited.

  Further, when the dried vetiver root cut is placed in an exposed state, it may be mistaken for garbage as described above. When put in a bag, the solid matter itself causes a problem that the release of the pest repellent component into the atmosphere is weakened and the pest repellent ability is weakened.

(Part 2)
As the second form, an extract obtained by drying a vetiver root by some method is used as a pest repellent. Form 1 is a solid material called a cut product, whereas form 2 is a liquid. For this reason, a liquid vetiver root extract is sprayed on a place where it is desired to avoid pests by spraying or the like. By spraying, the extract of vetiver root penetrates into the place where you want to repel the pest, and you can repel the pest. This is because the sprayed extract transpirations into the outside air and exhibits components that repel pests.

  Or it installs in the place which wants to repel a pest in the state where the extract liquid permeated paper. Also in this case, the extract liquid transpires from the infiltrated paper to the outside air, and a component that repels pests is exhibited.

  However, since it is simply applied to a structure or the like in a liquid state, the extract is evaporated in a short time. There are two problems with transpiration in a short time.

  As problem 1, in order to maintain the pest repellent ability, it is necessary to always repeat application of liquid spraying. This repeated work may be forgotten by all means, leading to problems that make it difficult to maintain the ability to repel pests. In particular, when the pests to be repelled are small and hardly noticeable pests such as mites and white ants, it is difficult to remember the spraying operation of the liquid pest repellent by increasing or decreasing the number of pests. As a result, the operator may forget to spray the liquid pest repellent without being aware of the actual pest damage.

  Of course, since it is a liquid pest repellent, its decrease or disappearance is not visible. If they are not visible, the liquid pest repellent may not be noticed and the spraying and coating operations may be forgotten. If it is forgotten, it becomes a problem that pest repellent cannot be realized.

  Problem 2 is that transpiration is so fast that pest repelling cannot be achieved depending on the type of pest. There are many types of possible pests. Among these many types of pests, ticks and white ants are small in size and large in number, and therefore have high resistance as a herd against pest repellents. In this case, if the transpiration is very fast, the repellency to mites and white ants moving in the flock will not be exhibited. For example, liquid pest repellents will evaporate before they can fully demonstrate their ability to repel mites and white ants that reach the flock.

  If the transpiration is completed, the pest repellent ability is naturally lost, and a part of the group of mites and white ants arrives without being repelled. As a result, pests cannot be avoided.

  Thus, even if it is the pest repellent of the form 2 which is the liquid which is the extract of a vetiver root, it is difficult to implement pest repellent.

(Characteristics of each pest)
There are various things that are defined as pests by human living space and lifestyle.

  For example, cockroaches are pests that impair not only hygiene but also the comfort of human life. Flies are not only sanitary concerns like cockroaches, but are pests that impair comfort. Mosquitoes can also be cited as pests that fly like flies. Mosquitoes also pose medical physiological problems such as physiological effects on the human body and disease transmission.

  These cockroaches, flies and mosquitoes are undesirable pests. However, these are behaviors of one or several animals, and have the feature of repeated movement. Rather than avoiding it, it is a pest that needs to be blocked in the whole room or building so that it does not enter a room or building.

  On the other hand, ticks and white ants are very small and have the property of being active in groups (even if they are not in a situation with a group, a large amount of solids work together). In addition, ticks and white ants, unlike cockroaches, flies, mosquitoes, etc., have the property of concentrating on certain parts of the building and certain clothing and continuing activities and living on the spot. For this reason, ticks and white ants affect the human body and affect the structure while concentrating on a certain place.

  Among the pests, mites and white ants are strongly required to avoid reaching a specific place. Of course, it is important to block the entire room or the entire building. However, as a practical problem, it is important to prevent ticks and white ants from reaching a predetermined place in the room or building.

  In addition, ticks and white ants act on a plurality of solids such as swarms, so it is necessary to avoid repelling of a plurality of solids having different operating speeds and moving speeds. Furthermore, there are various places where ticks and white ants prefer to move in the building. For this reason, there is a desire to avoid mites and white ants in various places in buildings and clothing.

  In addition, ticks and white ants are small pests and thus have a characteristic that they are difficult to notice. For this reason, unlike large-sized pests such as cockroaches, it is difficult to notice the occurrence of pests and the persistence of the generated pests. For this reason, pest repellents corresponding to ticks and white ants need not be installed or replaced based on the presence of the target pests, but must be installed, particularly noticed for replacement. .

  Mites and white ants have such characteristics among pests.

(Overview)
First, the general outline of the pest repellent in the embodiment will be described.

  FIG. 1 is a schematic diagram of a pest repellent according to an embodiment of the present invention. The pest repellent 1 includes a pest repellent liquid 2 mainly composed of a vetiver root extract and a substrate 3 containing the pest repellent liquid 2. That is, the pest repellent 1 has a three-dimensional shape formed by the substrate 3. The pest repellent 1 is formed by the three-dimensional substrate 3.

  In addition, the substrate 3 is a polymer material (polymer material) capable of absorbing (containing) water. With this characteristic, the substrate 3 can create a state in which the pest repellent liquid 2 that is a liquid is contained. The pest repellent 1 containing the pest repellent liquid 2 that is a liquid in the gap between the molecules while being in a solid state is constituted by the water-containing state.

  For this reason, if the base | substrate 3 is substantially spherical shape, the insect repellent 1 will have a substantially spherical shape. Or if the base | substrate 3 is a substantially elliptical spherical shape, the insect repellent 1 will have a substantially elliptical spherical shape. Of course, if the substrate 3 is square, the pest repellent 1 has a square shape. Since the pest repellent 1 has a three-dimensional shape in this way, the pest repellent 1 can be easily installed at an installation location that is the purpose of pest repellent.

  Although it is difficult to show in FIG. 1, the base 3 constitutes a substantially spherical outer shape and contains the pest repellent liquid 2 as a whole. For this reason, the outer periphery of the base body 3 has a wet feel.

  The substrate 3 is a polymer or a polymer material. By being such a raw material, the pest repellent liquid 2 which is a liquid can be hydrated as a whole. Although the base | substrate 3 is based on the structure, the insect repellent liquid 2 is hydrated in each of an outer periphery, an inside, and a center part.

  The pest repellent liquid 2 contained in the substrate 3 is evaporated to release the pest repellent component to the outside air. The pest repellent liquid 2 contained in the substrate 3 is reduced by transpiration and release. Since the base 3 contains the pest repellent liquid 2 between its molecules and structures, etc., the base 3 contracts as the pest repellent liquid 2 decreases. By the transpiration and release, the pest repellent 1 can exhibit the pest repellent effect by releasing the pest repellent component to the outside air.

  At this time, the pest repellent liquid 2 is contained in the substrate 3 having a water-containing structure. For this reason, the base | substrate 3 does not leak the insect repellent liquid 2 in the state of a liquid. That is, only the pest repellent component that has been vaporized into gas is released to the outside air.

  As a result of this release, the pest repellent effect of the pest repellent liquid 2 is released to the outside air at the installation site. By this release, the pest repellent 1 can avoid the arrival of pests at the installation location.

  The pest repellent liquid 2 is mainly composed of a vetiver root extract. The extract of vetiver root is obtained as follows.

  Vetiver roots are dried. This dried vetiver root is the basis for the production of the extract.

  The dried vetiver roots are soaked in water and then autoclaved to obtain a water-soluble extract. This water-soluble extract becomes an extract. Alternatively, dried vetiver roots are immersed in water and extracted with hot water to obtain a water-soluble extract. This water-soluble extract becomes an extract. Alternatively, the dried vetiver root is extracted with alcohol to obtain a water-soluble extract. This water-soluble extract becomes an extract.

  Thus, at least one water-soluble extract obtained by autoclave extraction, hot water extraction, and alcohol extraction becomes an extract.

  The pest repellent liquid 2 contains this extract as a main component. This pest repellent solution 2 is wrapped in a substrate 3 to produce a pest repellent 1. This pest repellent 1 is installed in a predetermined installation location where it is desired to repel pests, particularly mites and white ants. The installed pest repellent 1 evaporates the pest repellent liquid 2 containing water from the substrate 3. The gas of the pest repellent liquid 2 spreads from the substrate 3 by transpiration. This gas contains the insect repellent component of the insect repellent liquid 2.

  In this way, when the gas evaporated from the pest repellent liquid 2 is released to the outside air, the pest repellent component spreads around the installation place. As a result, the installation location can repel pests.

  Moreover, it takes a certain time for the pest repellent liquid 2 to disappear due to transpiration, unlike the case where the liquid is applied or sprayed on the structure as it is. For example, the pest repellent solution 2 disappears due to transpiration in about one month. For this reason, the release of the pest repellent component at the installation location is realized over a long period of time. As a result, pests having characteristics such as mites and white ants can be reliably avoided.

  Next, details of each element will be described.

(Pest repellent)
The pest repellent liquid 2 is mainly composed of a vetiver root extract.

  Here, an example of production of the pest repellent liquid 2 will be described with reference to FIG. FIG. 2 is a flowchart of the manufacturing process of the pest repellent solution in the embodiment of the present invention.

  First, a dried vetiver is prepared by drying vetiver roots. The dried vetiver can be produced as follows. After washing the roots of the vetiver, dry it in the sun for about 1 to 2 days and then dry it in a well-ventilated area for about 1 week.

  Instead of shade drying, vetiver roots may be forcibly dried in a high-temperature environment. For example, the vetiver roots may be dried by applying wind at a required temperature to the washed vetiver roots. More specifically, it may be dried at a temperature of 27 ° C. to 105 ° C., preferably 27 ° C. to 60 ° C. The warm air may be generated by a blower that sends out air that has been warmed by a built-in heater, or may be generated by sending indoor air that has reached the temperature described above using a blower.

  On the other hand, a commercially available dry vetiver may be purchased.

  As shown in FIG. 2, the dried vetiver obtained by drying the roots of the vetiver is put into a cutting machine, and cut into a length of about 1 to 3 cm to obtain vetiver chips (step S1).

  The obtained vetiver chip is weighed to a predetermined amount according to the amount for obtaining a desired extract (step S2). The weighing may be performed by a weighing container or an extraction pot used to obtain an extract.

  A water-soluble extract is extracted from the weighed vetiver chip in step S3. As described above, the extraction is performed by any one of autoclave extraction, hot water extraction, and alcohol extraction.

  The autoclave extraction is performed at 100 ° C. to 125 ° C. for 30 to 40 minutes after the vetiver chips are immersed in water. The hot water extraction is performed at 50 ° C. to 65 ° C. for 1 to 2 hours after the vetiver chip is immersed in water. In this way, an extract is obtained in step S3.

  In the alcohol extraction, an alcohol solution containing 50% by volume to 85% by volume of alcohol and having a pH of 4 or more and 6 or less can be used. If the alcohol content is less than 50% by volume, the required extraction cannot be performed, and if the alcohol content exceeds 85% by volume, it is difficult to work safely. On the other hand, when the extract is outside the range of pH 4 or more and pH 6 or less, the active ingredient cannot be extracted. For this reason, it is appropriate to perform alcohol extraction using an alcohol solution in the above-mentioned range.

  Although methyl alcohol can also be used as the alcohol, ethyl alcohol is preferred from the viewpoint of safety. Moreover, as a pH adjuster, organic acids, such as lactic acid, a citric acid, and an acetic acid, and / or its salts are suitable from a safety point. On the other hand, as a solvent for diluting alcohol to a predetermined concentration, water is preferable from the viewpoint of stability, safety, and availability.

  Note that the dried vetiver may not be cut into vetiver chips in step S1, but may remain in the form of a dried vetiver.

  Here, the mixing ratio of the vetiver chip and the extract can be selected as appropriate, but it is preferable to use 10 L to 30 L of the extract with respect to 1 kg of the vetiver chip. When the amount of the extract is less than 10 L with respect to 1 kg of the vetiver chip, the required extraction rate cannot be obtained and the utilization efficiency of the vetiver is low. On the other hand, when the amount of the extract exceeds 30 L with respect to 1 kg of the vetiver chip, the capacity of the extract becomes excessive, so that the workability of the extraction process is lowered and the stockability of the stock solution is also lowered.

  After the active ingredient is extracted by immersing the vetiver chip in the extract at room temperature for about 1 to 2 weeks, the vetiver chip is filtered and the stock solution is collected (step S4). The stock solution has a pH of about 4.5 to 6.0 and has a dark brown color.

  This stock solution is diluted with water so as to be 1 to 10% by volume to prepare a concentration (step S5). This adjusted concentration is used as the extract. That is, it is used as a pest repellent liquid 2. By step S4, the concentration of the vetiver root component in the extract is further increased, and there is an advantage that the pest repellent function of the vetiver root is increased.

  Of course, the extract obtained by the extraction process in step S3 may be used as the pest repellent 2 as it is.

  In addition, in step S6, the inhibitor which suppresses the smell of the extract of a vetiver root may be added. In step S6, a fragrance is added as an inhibitor.

  Here, as a fragrance | flavor which is an inhibitor which suppresses the smell of a vetiver extract, the mint extract extracted from mint, such as peppermint (Western mint), Japanese mint, spearmint, water mint, or lemon mint, is suitable. The vetiver extract has a vetiver odor, which is a unique odor derived from vetiver. However, when the mint odor released from the mint extract coexists, the human odor becomes difficult to perceive the vetiver odor. Therefore, the insect repellent solution 2 obtained by adding the mint extract to the vetiver extract can conceal the vetiver odor by the mint odor and give the user a refreshing mint odor.

  The mint extract may be either an essential oil body or a crystal body, and may be a single or combination of the various mint described above. Moreover, what is necessary is just to determine the addition amount according to the quantity of the pest repellent liquid 2, but in the case of mint essential oil, it is good to add about 0.2-1.2 mass% with respect to a pest repellent liquid.

  On the other hand, limonene can be used in place of the mint extract as the fragrance described above. Similarly to the mint odor, the limonene odor released from limonene can make it difficult for humans to sense the vetiver odor.

  In addition, an appropriate amount of preservative may be added to the pest repellent solution 2 to improve the storage stability.

  Moreover, you may add alcohol in step S5 mentioned above as needed. Thereby, the volatility of the pest repellent liquid 2 can be increased and the diffusibility of the active ingredient can be improved.

  In particular, the pest repellent liquid 2 releases the gas evaporated from the substrate 3 to the outside air. For this reason, it is also suitable that the degree of volatility is adjusted by the addition of alcohol. In order to expedite the release of the vaporized (volatilized) gas from the substrate 3 to the outside air, it is sufficient to increase the amount of alcohol added, and in the opposite case, do not add alcohol or reduce the amount added. That's fine.

(Substrate)
The substrate 3 has a role of forming the outer shape of the insect repellent 1 and containing the insect repellent liquid 2 that is liquid or semi-liquid (gel or the like). The pest repellent liquid 2 which is a liquid between molecules and structures can be hydrated with a polymer or a polymer material.

  The substrate 3 has various three-dimensional shapes such as a substantially spherical shape, a substantially elliptical spherical shape, and a rectangular shape. By having such a shape, it is easy to produce and to easily contain the pest repellent liquid 2 as the contents. Furthermore, installation at the installation location becomes easy.

  Moreover, when the base | substrate 3 has these shapes, the pest repellent 1 will also have the same shape. Such a pest repellent 1 may be installed alone at the installation location. Alternatively, a plurality of pest repellents 1 may be installed at the installation location. Furthermore, the plurality of pest repellents 1 may be accommodated in the case, and the case may be installed at the installation location.

  When accommodated in the case, the case is preferably provided with air holes so that the transpiration of the pest repellent liquid 2 from the individual pest repellent 1 can be released to the outside air.

  The substrate 3 can contain the contents of the pest repellent liquid 2 as a content, and can release the gas generated by the evaporation of the pest repellent liquid 2 to the outside air. At this time, since the pest repellent liquid 2 which is a liquid is contained in the tissue, the pest repellent liquid 2 which is a liquid does not leak out as it is. However, it can be discharged to the outside when it evaporates into a gas.

  The base 3 is formed of, for example, a sodium polyacrylate cross-linked body. By this material, the substrate 3 can easily contain (hold) the pest repellent liquid 2 which is a liquid inside. In addition, it is easy to release the evaporated gas.

  Further, it is appropriate that the substrate 3 has flexibility. It is because it becomes easy to install the insect repellent 1 on a floor surface etc. by having flexibility.

  Moreover, the base | substrate 3 can be shrink | contracted according to the reduction | decrease of the pest repellent liquid 2 containing water. By having flexibility, the base body 3 can contract in accordance with the decrease in the pest repellent liquid 2. The pest repellent liquid 2 discharges the evaporated substrate from the substrate 3 to the outside air while being evaporated. Due to this transpiration and release, the pest repellent liquid 2 reduces its volume.

  At this time, if the substrate is hard and not flexible, the substrate does not shrink in accordance with the decrease in the pest repellent solution 2. If it does not contract, there is a problem that it is difficult for the user to grasp the replacement time of the pest repellent 1. Alternatively, there is a problem that a gap is generated between the base and the insect repellent liquid 2, and the evaporated gas is difficult to be released to the outside. Further, there is a problem that the pest repellent liquid 2 is less likely to evaporate due to the formation of voids.

  In order not to cause these problems, it is preferable that the substrate 3 contracts in accordance with the volume reduction accompanying the transpiration of the pest repellent liquid 2 containing water. Since the substrate 3 itself is a water-containing material, the substrate 3 contracts in accordance with the decrease in the pest repellent liquid 2 without causing a gap.

  That is, the pest repellent 1 makes it easy for the user to grasp the replacement time. Moreover, the release effect of the pest repellent component by the transpiration of the pest repellent liquid 2 is also easily sustained for a long period of time.

  In addition, it is also suitable for the base | substrate 3 to change the color and brightness | luminance with the reduction | decrease of the pest repellent liquid 2 which is the content. This can be realized by the relationship between the refractive index and color of the substrate 3 and the color of the pest repellent liquid 2 as the contents. By changing the color and brightness of the substrate 3, the user can easily visually check the replacement time and the remaining state of the pest repellent liquid 2.

  It is important to avoid long-term pests such as ticks and white ants that are active in large groups. For this reason, it is important that the replacement time can be reliably grasped and the pest repellent base 1 is appropriately replaced. Also in this respect, the characteristics of the base 3 of the pest repellent 1 in the embodiment can be appropriately handled.

  Combined with the certainty of replacement, the pest repellent 1 in the embodiment can reliably repel pests such as mites and white ants.

  An outer wall may be further provided on the outer periphery of the base 3. It is because the shape of the pest repellent 1 is easily maintained by providing the outer wall. At this time, it is preferable that the outer wall can discharge the evaporated substrate.

(pest)
The pests that the pest repellent 1 repels may vary, but as described above, it is optimal for mites and white ants. This is because the pest repellent 1 is capable of maintaining the pest repellent power over a long period of time because the contents of the pest repellent liquid 2 are gradually evaporated from the substrate 3.

  Moreover, the base | substrate 3 also shrink | contracts as the pest repellent liquid 2 of the contents evaporates. For this reason, the remaining state of the pest repellent liquid 2 (that is, the remaining state of the ability of the pest repellent 1) can be readily seen by appearance. This makes it easy to know when to replace.

  The pest repellent 1 is optimal for repelling small mites and white ants that are active in groups and groups and are small and difficult to see due to such long-term maintenance and easy grasp of the replacement time.

  Here, it is preferable that the ticks are Yake leopard mites. Yake leopard mites are active in various places of buildings, including futons and clothing. Being able to avoid the dust mite is important for ensuring hygiene and comfort in daily life.

  Similarly, the white ants are preferably termites. This is because termites are the most popular type of white ants, and are easily damaged by buildings such as ordinary houses.

  As described above, the pest repellent 1 in the embodiment is effective in repelling pests that are small and collectively active.

  Small and collective pests, such as the leopard mite and the termite, have no effective method of killing them and are difficult to block throughout the room or building. Because it is small in size, it does not know where to enter the room. In addition, the small size makes it difficult to notice intrusion into the human body and structures while being difficult to find visually.

  Also, unlike pests such as cockroaches and flies, which have a long travel distance, leopard mites and termites tend to accumulate in a certain place. If it accumulates, it will naturally cause harmful effects. However, by installing the pest repellent 1 of the embodiment in a place where it tends to accumulate or a place where it does not want to accumulate based on the tendency to accumulate, it is possible to prevent the accumulation of dust mites and termites.

  In addition, the pest repellent 1 according to the embodiment contracts the substrate 3 in accordance with the volume reduction accompanying the evaporation of the pest repellent liquid 2 as the contents. That is, the volume decreases as a whole. For this reason, the exchange time of the pest repellent 1 can also be easily grasped. This grasp makes it difficult to interrupt the installation of the pest repellent 1 at the installation location. As a result, the pest repellent effect against the dust mites and the termites can be maintained for a long time. If the pest repellent effect can be maintained over a long period of time, it is possible to surely prevent the lepidopterous mites and the termites from reaching places where they do not want to accumulate.

  As described above, the pest repellent 1 according to the embodiment optimally corresponds to the ecology and behavioral characteristics of mites and white ants, and can reliably repel them over a long period of time. Moreover, installation and storage are easy because it is a form having a certain shape. Of course, distribution and sales are easy, and there are advantages in both supply and demand.

  Furthermore, since the pest repellent ability and duration standard of one pest repellent 1 can be understood, the user installs a number of pest repellents 1 according to the type and amount of pests to be repelled and the characteristics of the installation location. Just do it. Of course, since the provider can also propose the number of uses according to the user's various uses, the use can be expected to expand.

  Next, the experimental result which confirmed the effect of the insect repellent 1 demonstrated in embodiment is demonstrated.

(Experiment 1: Repellent effect of mite leopard mite)
In Experiment 1, the inventor experimented the repellent effect by using the mushroom mite as a pest example.

  First, the experimental conditions are as follows.

  Treatment area: Petri dish 1 with a diameter of about 90 mm. A 35 mm petri dish 2 installed on the petri dish 1.

  Sample: Examples to Comparative Examples described below

  Target pest: Yake leopard mite

  Number of leopard mites thrown into the treatment area: 1 g (about 10,000)

  Next, an experiment was performed according to the following procedure.

  (Procedure 1) About 1 g of a leopard mite is put into a petri dish 1 with a diameter of 90 mm.

  (Procedure 2) Following the procedure 1, a 35 mm petri dish 2 is set on a 90 mm petri dish 1. By this procedure 2, a processing zone is formed.

  (Procedure 3) A filter paper was set in the petri dish 2, and a sample (pest repellent of the example) was set on the filter paper. Further, about 50 g of bait (MF feed: manufactured by Oriental Yeast Co., Ltd.) was installed as a source for attracting mites.

  (Procedure 4) The treatment area by the petri dish 1 is maintained at 24 ° C.

  (Procedure 5) 48 hours after the start of the experiment, the number of living mushroom mites on the filter paper was measured with a stereomicroscope. After the measurement, the repelling rate (%) was calculated by the following calculation formula.

(Calculation formula 1)
Repelling rate (%) = 100 × (number of leopard mites in untreated group−number of leopard mites in specimen treated group) / number of leopard mites in untreated group However, in the case of minus, 0%.

  FIG. 3 is a schematic diagram showing the state of Experiment 1 of the present invention. Experiment 1 was conducted in this manner.

Example 1
It is a pest repellent of a pest repellent liquid mainly composed of a polymer substrate and the vetiver extract described in the embodiment. This pest repellent has a substantially spherical three-dimensional shape. The weight is an average of 4 g. In Example 1, one pest repellent was installed in the treatment area.

(Example 2)
Two pest repellents comprising the same substrate as in Example 1 and the pest repellent contained therein were installed in the treatment area.

(Example 3)
The same pest repellent as in Example 1 was installed in three treatment areas.

(Comparative Example 1)
No pest repellent (including pest repellent solution) is installed in the treatment area. That is, the treated area of Comparative Example 1 is an untreated area.

  The experimental state of these Example 1 to Comparative Example 1 is shown in FIG. FIG. 4 is a photograph showing an experimental state in Experiment 1 of the present invention. As is clear from FIG. 4, one spherical pest repellent is installed in the treatment area 1 corresponding to Example 1. Two spherical pest repellents are installed in the treatment area 2 corresponding to Example 2. In the treatment zone 3 corresponding to Example 3, three spherical pest repellents are installed. No pest repellent is installed in the untreated section corresponding to Comparative Example 1.

  Based on such Example 1, Example 2, Example 3, and Comparative Example 1, the experiment according to said procedure 1-5 was conducted, and the repelling rate was computed. FIG. 5 is a table showing the experimental results of Experiment 1 of the present invention.

  The number 1 in the table of FIG. 5 corresponds to Example 1, the number 2 corresponds to Example 2, the number 3 corresponds to Example 3, and the number 4 corresponds to Comparative Example 1.

  As is apparent from the table of FIG. 5, in Example 1, the repelling rate is 88.1%. In Example 2 and Example 3, the repelling rate is 100%. In Comparative Example 1, the repelling rate is extremely low.

  Thus, it can be seen that the pest repellent containing the pest repellent liquid by the substrate has a sufficiently high repellent rate of pests that perform small collective behavior such as the dust mite. In particular, it can be seen that the difference in the repellent rate between Example 1 and Example 2 (3) changes the amount of the pest repellent component released depending on the number, thereby controlling the repellent rate. In the case of spraying a liquid, even if the amount is increased, the repellency is not increased because it evaporates in a short time. On the other hand, the insect repellent described in the embodiment that is solid and can be released for a long time can maintain the repellent effect even for a long time of 48 hours.

  For example, in the comparative example 2 in which a liquid pest repellent liquid is applied to the filter paper instead of a pest repellent in the form of containing a pest repellent liquid with a substrate, the repellent rate is low under the same conditions as in Experiment 1.

  Comparative Example 2 is the same experiment as in Examples 1 to 3, in which 0.5 ml of a pest repellent solution was permeated into the filter paper. That is, the pest repellent liquid as a liquid is infiltrated into the filter paper, not the untreated section where the pest repellent liquid or the pest repellent is not installed as in Comparative Example 1.

  In the comparative example 2, the pest repellent liquid permeated from the filter paper is evaporated to realize the pest repellent effect. FIG. 6 is a table showing the experimental results of Comparative Example 2. In Comparative Example 2, the repelling rate after 48 hours is as low as 8.0% as is apparent from FIG. This is thought to be because the insect repellent solution soaked in the filter paper evaporates immediately and the insect repellent effect is not sustained. It was confirmed that in the case of pests that are small and collective, such as the leopard mite, even if they can exhibit the repellent effect in the first stage, if the repellent effect cannot be maintained, the repellent cannot be realized in the end.

  It turns out that the pest repellent of Examples 1-3 can implement | achieve the high repellent rate with respect to a house dust mite with respect to the comparative example 1 which does not have a pest repellent. Further, by comparison with Comparative Example 2, it was confirmed that the pest repellent component was released by the evaporation of the pest repellent solution for a long time after being accommodated in the substrate. The long-term persistence ensures that the pest repellent can repel the dust mites in place.

  As described above, it was confirmed in Experiment 1 that the pest repellent 1 described in the embodiment has a high repellent effect against the dust mite.

  In addition, it is thought that not only a leopard mite but also a tick has the same effect.

(Experiment 2: Termite repellent experiment)
In Experiment 2, the termite repellent experiment was conducted according to the same procedures and standards as in Experiment 1.

(Example 2-1)
2 g of a pest repellent containing the pest repellent solution in the substrate described in the embodiment is added.

(Comparative Example 2-1)
Infiltrate the filter paper with 1 mm pest repellent solution.

(Comparative Example 2-2: No treatment)
Do not use any pest repellent or pest repellent solution.

  The experiment was conducted in the following procedure.

  (Procedure 1) Two filter papers (semicircle with a diameter of 85 mm) are placed in a petri dish (diameter 90 mm), and a gap of 0.5 mm is provided between the filter papers. As a result, the petri dish is divided into two processing zones.

(Procedure 2) Only Example 2-1 or Comparative Example 2-1 is installed in one processing section. The other processing section is an untreated section as in Comparative Example 2-2. As a result, two petri dishes are prepared, and one petri dish is provided with two of Example 2-1 and Comparative Example 2-2. In the other petri dish, two of Comparative Example 2-1 and Comparative Example 2-2 are installed.
The first petri dish is provided with an example 2-1 treatment zone and a comparative example 2-2 treatment zone (no treatment zone).
In the second petri dish, a comparative example 2-1 treatment section and a comparative example 2-2 treatment section (non-treatment section) are provided.

  (Procedure 3) Ten termites are introduced into two petri dishes.

  (Procedure 4) Two petri dishes are maintained on 25 degreeC conditions.

  (Procedure 5) On a predetermined day, the number of living termites and the number of suffering deaths in each section of the petri dish are measured, and the suffering rate is calculated by the following formula 2.

(Formula 2) Mortality rate (%) = (1-survival and death in treated area / survival and death in untreated area) × 100
However, in the case of minus, it is 0%.

  FIG. 7 is a photograph showing the state of Experiment 2 of the present invention. The sample B treatment area in FIG. 7 is the treatment area of Example 2-1. The sample A treatment zone is the Comparative Example 2-1 treatment zone. The untreated section is a comparative section 2-2 treated section.

  FIG. 8 is a table showing the results of Experiment 2 of the present invention. As is apparent from the table of FIG. 8, the mortality rate in the treated area of Example 2-2 is almost 100%. On the other hand, the mortality rate in the treated area of Comparative Example 2-1 is 0%. Of course, the mortality rate in the treated area of Comparative Example 2-2, which was not treated, was also 0%.

  The termites are larger in size than the mite mites, and are more insecticidal than are repelled by the pest repellent component of the pest repellent. For this reason, the mortality rate with the repellent rate as a similar index is of course the pest repellent 1 in which the pest repellent solution 2 is accommodated in the substrate 3 as compared with the comparative example 2-2, It was confirmed that Comparative Example 2-1 in which only the pest repellent solution was permeated had an effect of a high mortality rate. Note that Sample A in FIG. 8 is Comparative Example 2-1, and Sample B is Example 2-1.

Experiment 2 confirmed that the pest repellent in the embodiment in which the pest repellent effect is released over a long period of time also has a high effect in the case of the termites.
In the case of the termites, the pest repellent ability can be quickly lost by simply applying or spraying a liquid pest repellent solution on the object. This is because the termites also perform small and collective actions, so that when they exhibit their ability to repel pests in a short time, they will reach the installation site again after their ability to repel pests disappears.

  On the other hand, since the pest repellent 1 according to the embodiment of the present invention slowly evaporates the pest repellent liquid 2 of the contents from the base 3, the pest repellent ability at the installation location can be maintained for a long period of time. In addition, since the pest repellent 1 allows the user to easily grasp the decrease in the pest repellent liquid 2 which is the content, the necessary replacement can be easily performed. As a result, the ability to repel pests can be maintained over a long period of time at an installation location where it is desired to prevent the arrival of termites.

  Also in Experiment 2, the effect corresponding to the property of the termite of the pest repellent 1 in such an embodiment was confirmed.

  The pest repellent described in the embodiment is an example for explaining the gist of the present invention, and includes modifications and alterations without departing from the gist of the present invention.

1 Pest repellent 2 Pest repellent 3 Substrate

Claims (11)

A pest repellent that repels certain types of pests,
A pest repellent solution composed mainly of vetiver root extract;
A substrate containing the pest repellent solution,
The extract is
Water-soluble extract obtained by soaking dried vetiver plant roots in water and autoclaving extraction, water-soluble extract obtained by soaking dried vetiver plant roots in water and hot water extraction, and dried Including at least one water-soluble extract obtained by alcohol extraction of roots of vetiver plants,
The specific type of pests is a pest repellent, including mites and white ants.   The insect pest repellent according to claim 1, wherein the mites are mites.   The pest repellent according to claim 1, wherein the white ants are termites.   The pest repellent according to any one of claims 1 to 3, wherein the substrate causes the pest repellent liquid containing water to evaporate to the outside air.   The pest repellent according to any one of claims 1 to 4, wherein the substrate has a substantially spherical shape or a substantially elliptical spherical shape.   The pest repellent according to any one of claims 1 to 5, wherein the substrate is formed of a crosslinked sodium polyacrylate.   The pest repellent according to any one of claims 1 to 6, wherein when the pest repellent liquid containing water decreases, the substrate shrinks its volume in accordance with the decrease. Provided on the outer periphery of the base body, an outer wall for releasing the pest repellent solution that evaporates,
The pest repellent according to claim 7, wherein the outer wall contracts in accordance with contraction of the base.   9. The autoclave extraction is performed at 100 ° C. to 125 ° C. for 30 to 40 minutes, and the hot water extraction is performed at 50 ° C. to 65 ° C. for 1 to 2 hours. Or a pest repellent.   The pest repellent according to any one of claims 1 to 9, wherein the pest repellent contains an inhibitor that suppresses the odor of the vetiver root extract.   The pest repellent according to claim 10, wherein the inhibitor is a mint extract or limonene.