JP7324887B2 - Mosquito control aerosol and mosquito control method - Google Patents

Description

The present invention comprises a pressure-resistant container provided with a fixed-quantity injection valve containing an aerosol undiluted solution containing an insect-controlling component and an organic solvent, and a propellant, and an injection provided with an injection port connected to the fixed-quantity injection valve. and a mosquito control aerosol, and a mosquito control method using the same.

Methods for exterminating flying pests include, for example, a method in which a carrier impregnated with a pesticidal agent containing an insecticidal component is impregnated with a pesticidal agent to evaporate the pesticide into a treatment space, a method in which the pesticide is directly sprayed on flying pests, and a method in which flying pests are likely to appear. There is a method of spraying a drug in advance, and the like. Regarding these methods, aerosol insecticides containing insecticidal components have been developed as products for exterminating flying insects that invade indoors. Aerosol insecticides are widely used as easy-to-use products because the insecticidal component can be easily sprayed into the treatment space.

Conventionally, there has been an aerosol insecticide that suppresses a decrease in the residual rate of the agent in the indoor air (see Patent Document 1, for example). According to Patent Document 1, after the drug is released, the drug is kept in the air to suppress the decrease in air concentration, so that it is possible to maintain a sufficient extermination effect against mosquitoes hiding in the shadows. there is

In addition, there is an aerosol insecticide in which the particle size when sprayed indoors is set larger than that in Patent Document 1 (see Patent Document 2, for example). Patent Document 2 is an aerosol insecticide based on the same technical idea as Patent Document 1, and aims to increase the insecticidal effect against mosquitoes by allowing the drug to remain in the air in the room as long as possible.

On the other hand, with respect to aerosol insecticides, there is a method for exterminating flying pests in a house characterized by attaching the aerosol insecticides to the surfaces of indoor structures or fixtures (see, for example, Patent Document 3). According to Patent Document 3, since a specific compound attached to an indoor structure etc. transpires, there is no need for repeated spraying or continuous operation of electric appliances, etc., and it is possible to eliminate indoor flying pests by simple means. can be effectively eradicated.

Japanese Unexamined Patent Application Publication No. 2001-17055 JP 2013-99336 A JP-A-2001-328913

The aerosol insecticide of Patent Document 1 attempts to increase the duration of the drug by adjusting the particle size of the drug that diffuses into the room so that the drug remains in the air longer. However, the residual rate of drug particles in the air is 0.5% or more in 12 hours or more from the start of treatment, and the aerosol insecticide of Patent Document 1, which aims to maintain the residual rate in the air, has a limited duration. be. Also in Patent Document 2, the residual rate of drug particles in the air is the same as in Patent Document 1, and it is not an aerosol insecticide that can be expected to last for a long time.

Here, among the mosquitoes to be controlled (not only ordinary mosquitoes such as Culex pipiens and Aedes albopictus, but also chironomids and moth flies belonging to the suborder Culexidae), in particular, Culex pipiens and Aedes albopictus are blood-sucking mosquitoes. It is necessary to protect oneself from these mosquitoes because they not only kill but also transmit infectious diseases. Mosquitoes are flying pests that invade indoors day and night, so an insecticide that is effective all day long, ie, 24 hours, is ideal.

However, as described above, the aerosol insecticides disclosed in Patent Documents 1 and 2 are effective only for about 12 hours. In Patent Documents 1 and 2, the drug is positively left in the air by adjusting the particle size of the drug. , the person or pet in the treatment space is placed in an environment where the drug is inhaled for a long time. Therefore, it is difficult to say that it is a preferable aerosol insecticide in terms of its effect on humans and pets.

Even in the extermination method of Patent Document 3, it is unclear whether a stable effect can be maintained over a long period of time. The drug particles injected into the air (A) remain suspended in the air, (B) adhere to floors and walls, (C) volatilize again after (B), or (D) decompose by light or the like. and disappear. In light of these, the extermination method of Patent Document 3 corresponds to type (C). However, when the chemical adhering to indoor structures volatilizes again into the air, it is easily affected by temperature, air volume, etc. Therefore, the extermination method of Patent Document 3 has a stable effect on extermination of flying pests. It is not guaranteed that you will get it.

The present invention has been made in view of the above-mentioned problems, and can exert an excellent control effect over a long period of time against flying pests, especially against mosquitoes, and is also effective against humans and pets. An object of the present invention is to provide a mosquito-controlling aerosol that reduces the influence of , and a mosquito-controlling method using the mosquito-controlling aerosol.

The characteristic configuration of the mosquito control aerosol according to the present invention for solving the above problems is
a pressure-resistant container provided with a metered injection valve containing an aerosol stock solution containing a pest control component and an organic solvent, and a propellant;
an injection button provided with an injection port connected to the fixed quantity injection valve;
A mosquito control aerosol comprising:
Adjusted so that the injection volume when the injection button is pressed once is 0.1 to 0.4 mL, and the injection force at an injection distance of 20 cm is 0.3 to 10.0 g f at 25 ° C.,
The aerosol undiluted solution is ejected from the ejection port as adhesive particles, at least a portion of which adheres to the exposed portion in the processing space.

As described in "Problems to be Solved by the Invention", conventional aerosol insecticides are being developed in the direction of actively diffusing the drug particles in the treatment space and extending the time they remain in the air as long as possible. had been However, if the residence time of the drug particles floating in the processing space is long, people or pets may inhale the drug particles if they enter the processing space, resulting in health concerns. be.
By the way, according to the research of the present inventors, mosquitoes typified by mosquitoes (hereinafter simply referred to as "mosquitoes" in the present invention) spend more time staying on walls than flying. turned out to be longer. In other words, most of the mosquitoes that have invaded indoors stay on the wall or the like, waiting for an opportunity to suck blood from humans. For this reason, the conventional technique of prolonging the time during which the drug particles float in the treatment space can produce a certain effect in controlling flying mosquitoes, but the effect is limited to wall surfaces and the like. The effect of the drug cannot be sufficiently exerted on the mosquitoes that are infected, and as a result, the control of the mosquitoes may be incomplete. From the above research results, the present inventors have found that increasing the effect of controlling mosquitoes that are perched on walls etc. suppresses the inhalation of drugs by humans and pets, and prevents mosquitoes that invade indoors. It was thought that this would lead to an improvement in control of the whole species.
Therefore, in the mosquito-controlling aerosol according to the present invention, at least part of the undiluted aerosol sprayed into the treatment space is exposed to the exposed parts in the treatment space (for example, the floor surface, wall surface, furniture, etc. existing in the treatment space). The surface of the structure, etc.) shall be formed as adhesive particles. Therefore, it is possible to effectively knock down or kill both the mosquitoes that are perched in the exposed area and the mosquitoes that are flying in the processing space, thereby improving the overall control effect of mosquitoes. can. In addition, even if particles other than the adhesive particles (hereinafter referred to as "floating particles") are evenly dispersed throughout the processing space, the concentration of the aerosol undiluted solution in the processing space is equal to that of the adhesive particles. reduced. Therefore, the amount of particles of the undiluted aerosol solution inhaled by people and pets in the treatment space is extremely small, and the mosquito control aerosol is safer for humans and pets.
In addition, the mosquito control aerosol according to the present invention has a spray volume of 0.1 to 0.4 mL when the spray button is pressed once, and a spray force at a spray distance of 20 cm at 25 ° C. of 0.3 to 10. .0 g·f. By adjusting the injection volume and the injection force in this way, at least part of the injected aerosol stock solution can be formed as adherent particles, and an excellent mosquito control effect can be achieved.

In the mosquito control aerosol according to the present invention,
It is preferable that the adhesive particles have a 90% particle diameter of 20 to 80 μm in the volume integrated distribution at 25° C. and an injection distance of 15 cm.

According to the mosquito-controlling aerosol of this configuration, by adjusting the adhesive particles to the above-mentioned optimum range, mosquitoes perched on the exposed part are reliably knocked down or killed by the insect-controlling component of the adhesive particles. can be made

In the mosquito control aerosol according to the present invention,
The adhesion amount of the adhesive particles is preferably 0.01 to 0.4 mg per 1 m ² of the exposed portion in the processing space.

According to the mosquito control aerosol of this configuration, by adjusting the adhesion amount of the adhesive particles to the above-mentioned optimum range, the insect pest control component of the adhesive particles reliably knocks the mosquitoes resting on the exposed part. Can be downed or killed.

In the mosquito control aerosol according to the present invention,
The volume ratio (a/b) between the aerosol stock solution (a) and the propellant (b) sealed in the pressure container is preferably 10/90 to 50/50.

According to the mosquito control aerosol of this configuration, when the volume ratio (a/b) of the aerosol stock solution (a) and the propellant (b) is within the above range, the adhesion formed from the aerosol stock solution to be jetted The sexual particles are in an optimal state. As a result, the adherent particles can reliably reach the exposed portion in the processing space, and the buoyant particles can float in the processing space in an amount that does not affect the human body or pets.

In the mosquito control aerosol according to the present invention,
The organic solvent is preferably at least one selected from the group consisting of higher fatty acid esters and alcohols.

According to the mosquito-controlling aerosol of this configuration, the organic solvent is at least one selected from the group consisting of higher fatty acid esters and alcohols. By using such an organic solvent, the effect of each component can be exhibited efficiently. In addition, when the aerosol undiluted solution is sprayed, the adherent particles can be formed in a well-balanced manner, and the control effect against mosquitoes becomes stable.

In the mosquito control aerosol according to the present invention,
The pest control component preferably has a vapor pressure of 2×10 ⁻⁴ to 1×10 ⁻² mmHg at 30°C.

According to the mosquito-controlling aerosol having this configuration, the insect-controlling component employs a component having a vapor pressure of 2×10 ⁻⁴ to 1×10 ⁻² mmHg at 30°C. Such a pest control component can form adherent particles in an optimal state when the aerosol concentrate is sprayed. In addition, an effective mosquito-controlling aerosol can be realized when each component other than the insect-controlling component, the above-mentioned organic solvent, and a propellant are used.

In the mosquito control aerosol according to the present invention,
When the aerosol undiluted solution is sprayed into the treatment space once, the duration of effect of the pest control component is preferably 20 hours or more for a space of 33 m ³ or less.

In the method of exterminating mosquitoes with an aerosol insecticide disclosed in Patent Documents 1 and 2, the duration of the drug was 12 hours. However, with the mosquito-controlling aerosol according to the present invention, by injecting the undiluted aerosol solution into the treatment space only once, the pest control effect is effective for 20 hours or more in a space of 33 m ³ or less, that is, for approximately one day. can be sustained.

In the mosquito control aerosol according to the present invention,
The injection port preferably has a diameter of 0.2 to 1.0 mm.

According to the mosquito control aerosol of this configuration, since the nozzle diameter is set in the above optimum range, the particle diameter of the aerosol undiluted solution and the ejection force can be appropriately adjusted, and the adhesive particles are optimally can be formed in a As a result, the effect of the pest control component can be exhibited.

The characteristic configuration of the mosquito control method according to the present invention for solving the above problems is
The mosquito control aerosol described in any one of the above is used to inject the aerosol undiluted solution into a treatment space to knock down or kill mosquitoes.

Since the mosquito control method of this configuration is carried out using the mosquito control aerosol of the present invention, it is possible to achieve an excellent mosquito control effect similar to that of the mosquito control aerosol described above.

In the mosquito control method according to the present invention,
Preferably, the aerosol concentrate is injected into the treatment space once every 24 hours.

In the mosquito-controlling aerosol according to the present invention, as described above, the duration of the insect-controlling component is 20 hours or more, which is about one day. Therefore, using this mosquito-controlling aerosol, it is possible to inject the undiluted aerosol solution into the treatment space once every 24 hours. By carrying out such a mosquito control method, it is possible to maintain the pest control effect throughout the living hours by spraying once a day at a fixed time.

FIG. 1 is a model diagram showing the behavior of particles of an aerosol undiluted solution when the aerosol undiluted solution is injected into a processing space.

The mosquito-controlling aerosol of the present invention comprises a pressure-resistant container provided with a fixed-quantity injection valve containing an aerosol undiluted solution containing an insect-controlling component and an organic solvent, and a propellant, and an injection connected to the fixed-quantity injection valve. and an injection button provided with a mouth. The mosquito-controlling aerosol of the present invention is described below. However, the present invention is not intended to be limited to the embodiments described below or the configurations described in the drawings.

<Aerosol stock solution>
[Insect Control Ingredients]
The pest control component, which is one of the main components of the aerosol stock solution, has a vapor pressure of 2×10 ^-4 to 1×10 ^-2 mmHg at 30°C. Metofluthrin, transfluthrin and the like are preferably selected as such pest control ingredients. These pest control ingredients can be used either alone or in admixture. Metofluthrin and transfluthrin have optical isomers and geometric isomers based on an asymmetric carbon, and these are also included in the present invention.

The content of the pest control component in the aerosol stock solution is preferably 1.0 to 50% by weight, considering that it is dissolved in an organic solvent and then sprayed into the treatment space. Within such a range, the pest control component is easily dissolved in the organic solvent, and when the aerosol undiluted solution is sprayed, at least a portion thereof is formed as adherent particles, and the particles other than the adherent particles are floating particles. (Adhesive particles and floating particles will be described in detail later.). If the content of the pest-controlling component in the aerosol concentrate is less than 1.0% by weight, the pest-controlling component cannot be effectively exerted, resulting in an insufficient mosquito-controlling effect. On the other hand, if the content of the pest-controlling component in the aerosol concentrate exceeds 50% by weight, the concentration of the pest-controlling component increases, making it difficult to prepare the aerosol concentrate appropriately.

As described above, the insect-controlling component contained in the mosquito-controlling aerosol of the present invention has a vapor pressure of 2×10 ⁻⁴ to 1×10 ⁻² mmHg at 30° C. (metofluthrin, transfluthrin, etc.). are preferred, but in addition to these ingredients, pyrethroid compounds such as profluthrin and empentrin, phthalthrin, resmethrin, cyfluthrin, phenothrin, permethrin, cyphenothrin, cypermethrin, allethrin, prallethrin, furamethrin, imiprothrin, etofenprox, etc. pyrethroid compounds, silicon compounds such as silafluofen, organophosphorus compounds such as dichlorvos and fenitrothion, and carbamate compounds such as propoxur.

The pest-controlling component is adjusted so that when the undiluted aerosol solution is sprayed into the treatment space once, the residual rate in the air (in the treatment space) after 2 hours has passed is 0.05 to 5%. The air survival rate is the ratio of the number (Q) of particles present in the processing space after a predetermined time to the number (P) of particles present in the processing space immediately after injection, that is, Q/P × 100 (%). can be simply determined from the theoretical concentration of the pest control component in the air and the concentration of the pest control component in the air after a predetermined period of time has elapsed, as described later in Examples. At this time, the injection amount of the pest control component is adjusted to 5.0 to 30 mg per 4.5 to 8 tatami mats (approximately 18.5 to 33.0 m ³ ). Within such a range, the aerosol stock solution forms adherent particles in an optimal state, and the pest control effect can be exhibited. Moreover, even with a relatively low survival rate as described above, mosquitoes can be effectively knocked down or killed. Furthermore, even if a person or pet in the treatment space inhales it, there is no danger that it will affect the human body or the pet, and it can be used safely.

[Organic solvent]
The organic solvent, which is another main component of the undiluted aerosol solution, can dissolve the above pest control components to prepare the undiluted aerosol solution. Anything that can be formed is used. Preferred organic solvents are higher fatty acid esters and alcohols. Higher fatty acid esters preferably have 16 to 20 carbon atoms in total, and examples thereof include isopropyl myristate, butyl myristate, hexyl laurate, and isopropyl palmitate. Of these, isopropyl myristate is particularly preferred. As alcohols, lower alcohols having 2 to 3 carbon atoms are preferred. The organic solvent can also be mixed with, for example, hydrocarbon solvents such as n-paraffin and isoparaffin, glycol ethers having 3 to 6 carbon atoms, ketone solvents, and the like.

[Other ingredients]
The aerosol for controlling mosquitoes of the present invention contains, in addition to the above components, acaricide, an antifungal agent for molds and fungi, an antibacterial agent, a disinfectant, an aromatic agent, a deodorant, a stabilizer, and an electrifying agent. Antifoaming agents, antifoaming agents, excipients and the like can also be added as appropriate. Acaricides include methyl 5-chloro-2-trifluoromethanesulfonamide benzoate, phenyl salicylate, 3-iodo-2-propynylbutyl carbamate and the like. Antifungal agents, antibacterial agents, and fungicides include hinokitiol, 2-mercaptobenzothiazole, 2-(4-thiazolyl)benzimidazole, 5-chloro-2-methyl-4-isothiazolin-3-one, trifoline, 3 -methyl-4-isopropylphenol, ortho-phenylphenol and the like. Fragrances include orange oil, lemon oil, lavender oil, peppermint oil, eucalyptus oil, citronella oil, lime oil, yuzu oil, jasmine oil, cypress oil, green tea essential oil, limonene, α-pinene, linalool, geraniol, phenylethyl. Fragrant ingredients such as alcohol, amylcinnamic aldehyde, cumin aldehyde, and benzyl acetate, and fragrance ingredients containing green leaf alcohol and green leaf aldehyde, which are called "green fragrance", can be mentioned.

<Propellant>
Examples of propellants used in the mosquito control aerosol of the present invention include liquefied petroleum gas (LPG), dimethyl ether (DME), nitrogen gas, carbon dioxide gas, nitrous oxide, compressed air, and the like. The above-mentioned propellants can be used singly or in a mixed state, but those containing LPG as a main component are easy to use.

In the mosquito-controlling aerosol of the present invention, the volume ratio (a/b) of the aerosol stock solution (a) and the propellant (b) is adjusted to 10/90 to 50/50. By adjusting to such a range, at least part of the aerosol stock solution can be formed as adhesive particles. As a result, the adherent particles can reliably reach the exposed portion in the processing space, and the buoyant particles can float in the processing space in an amount that does not affect the human body or pets. In this way, the adherent particles are present in an optimal state, and the pest control effect can be maximized. If the volume ratio (a/b) is 10/90 and the ratio of the propellant (b) is increased, that is, if the amount of propellant enclosed in the pressure container is increased, the amount of the aerosol stock solution to be sprayed becomes larger than necessary. Adhesive particles are reduced due to miniaturization. As a result, there may be a shortage of adhesive particles adhering to the exposed portion in the treatment space, and it may not be possible to reliably control mosquitoes perched on the exposed portion. On the other hand, when the volume ratio (a/b) is 50/50, the ratio of the propellant (b) is reduced, that is, when the amount of the propellant enclosed in the pressure container is reduced, the aerosol stock solution to be injected is reduced to the above Since it is difficult to form adherent particles having a particle size within the optimum range, the aerosol stock solution settles immediately after being sprayed. As a result, the amount of adherent particles adhering to the exposed portion in the treatment space becomes insufficient, making it difficult to knock down or kill mosquitoes at an early stage.

<Aerosol for mosquito control>
As described above, the pest control component, organic solvent, propellant, and other components to be blended as necessary are selected, and sealed in a pressure-resistant container to complete the aerosol product. This aerosol product is the mosquito-controlling aerosol of the present invention, and the undiluted aerosol solution is sprayed into the treatment space. An aerosol concentrate consists mainly of pest control ingredients and an organic solvent. Strictly speaking, it is different from the propellant, but the aerosol concentrate is released from the pressure container at the same time as the propellant. Therefore, in the following description, the aerosol contents including the aerosol concentrate and the propellant may be treated as "aerosol concentrate". Here, the injection valve provided in the mosquito-controlling aerosol according to the present invention will be described. The mosquito-controlling aerosol according to the present invention is mainly composed of a pressure-resistant container (aerosol container), a fixed quantity injection valve, and an injection button. An injection button, which is an operating part for injecting the undiluted aerosol solution, is connected to the constant injection valve, and the injection button is provided with an injection port through which the undiluted aerosol solution is ejected from the aerosol container to the outside (processing space). be.

When the injection button for the mosquito-controlling aerosol is pressed once, the pressure of the propellant activates the constant injection valve, and the undiluted aerosol solution in the pressure container rises to the injection port and is injected into the processing space. At this time, the injection volume of the undiluted aerosol solution is adjusted to 0.1 to 0.4 mL, more preferably 0.2 to 0.4 mL. Within this range, at least part of the aerosol stock solution is formed as adhesive particles. If the injection volume is less than 0.1 mL, the adhesive particles do not sufficiently adhere to the exposed portion in the treatment space because the injection volume is too small, knocking down or killing mosquitoes perched on the exposed portion. becomes difficult. Also, since the number of airborne particles is reduced, it becomes difficult to knock down or kill mosquitoes flying in the treatment space. On the other hand, if it exceeds 0.4 mL, the undiluted aerosol solution will be released into the processing space more than necessary, making it difficult for people and pets to enter the processing space. is also disadvantageous.

The mosquito-controlling aerosol is adjusted so that the ejection force is 0.3 to 10.0 g·f at 25° C. at a distance of 20 cm from the ejection port. Within this range, the adhesive particles formed from the aerosol undiluted solution can be caused to smoothly reach the exposed portion in the treatment space by one injection, and the effect of the pest control component can be exhibited. . Furthermore, it is preferable to set the injection port diameter of the injection port to 0.2 to 1.0 mm. Within this range, the particle size and ejection force can be adjusted appropriately, and at least part of the undiluted aerosol solution ejected into the treatment space is optimally formed as adhesive particles, exhibiting a pest control effect. and can reliably knock down or kill mosquitoes in the treatment space.

FIG. 1 is a model diagram showing the behavior of particles of an aerosol undiluted solution when the aerosol undiluted solution is injected into a processing space. FIG. 1(a) is a model diagram when a mosquito-controlling aerosol according to a conventional product is sprayed into a processing space, and FIG. It is a model diagram in the case of.
As shown in FIG. 1(a), a conventional mosquito control aerosol product (simply referred to as "conventional product") becomes particles M with a particle diameter of less than 20 μm when the aerosol undiluted solution is injected into the treatment space. to diffuse into the processing space. After a while from the spraying, the particles M spread further throughout the treatment space, volatilizing the pest control component. This can knock down or kill mosquitoes flying through the treatment space. However, as mentioned above, mosquitoes spend more time in the exposed part of the treatment space than in flight. cannot be knocked down or killed reliably. In addition, when the window of the processing space is opened and the wind blows in, some of the particles M floating in the processing space are blown away by the wind, which greatly reduces the effect of the pest control component. Furthermore, if the particles M remain suspended in the processing space for a long period of time, the amount of the particles M inhaled by the person or pet in the processing space increases, which may adversely affect the human body or pet.
Therefore, the present inventors have developed an aerosol product for controlling mosquitoes that solves these problems after intensive research. The adherent particles and floating particles, which are the characteristics of the mosquito-controlling aerosol product according to the present invention, will be described below.

[Adhesive particles]
As shown in FIG. 1(b), when the undiluted aerosol solution is injected into the processing space once, adherent particles X and buoyant particles Y are formed. In FIG. 1(b), the adherent particles X are indicated by white circles, and the buoyant particles Y are indicated by black circles. Both particle sizes are different, and the adhesive particles X are formed to have a larger particle size than the buoyant particles Y. A preferable particle diameter of the adhesive particles X is 20 to 80 μm in 90% particle diameter in volume cumulative distribution at 25° C. and a jet distance of 15 cm. Within this range, when the undiluted aerosol solution is sprayed into the processing space, it can quickly move and adhere to the exposed portion in the processing space. Therefore, mosquitoes resting on the exposed portion can be knocked down or killed by the pest control component of the adhesive particles X. In addition, it is also possible to expel mosquitoes that have invaded the processing space and are trying to perch on the exposed portion to the outside of the processing space because they are effective in controlling insect pests. If the particle size is less than 20 μm, the particle size is too small to reach the exposed part, and as a result, it is difficult to control mosquitoes that are perching or trying to perch on the exposed part. becomes. On the other hand, if the particle size exceeds 80 μm, the particle size is too large, making it difficult to control the behavior of the adherent particles, making it difficult to adhere them appropriately to the exposed portion. A more preferable particle diameter of the adhesive particles X is 25 to 70 μm in 90% particle diameter in volume integrated distribution at 25° C. and a jet distance of 15 cm.

The amount of adherent particles X attached to the exposed portion in the processing space is preferably 0.01 to 0.4 mg per 1 m ² , preferably 0.05 to 0.2 mg per 1 m ² . Within such a range, mosquitoes perched on the exposed portion can be effectively knocked down or killed. If the adhered amount is less than 0.01 mg/m ² , a sufficient control effect cannot be obtained against mosquitoes resting on exposed portions, making it difficult to knock down or kill mosquitoes. On the other hand, even if the adhered amount exceeds 0.4 mg per 1 m ² , the pest control effect is not greatly improved, and the amount of the aerosol stock solution used becomes excessive, which is economically disadvantageous.

[Floating particles]
Preferable particle size of the floating particles Y is less than 20 μm in 90% particle size in volume integrated distribution at 25° C. and injection distance of 15 cm. Within such a range, when the aerosol undiluted solution is sprayed into the processing space, it can diffuse quickly and float in the processing space. Therefore, mosquitoes flying in the treatment space can be knocked down or killed by the pest control component of the free-floating particles Y. Moreover, since it is also effective against mosquitoes that try to enter the processing space, it is possible to prevent them from entering the processing space. When the particle diameter of the floating particles Y is 20 μm or more, they function as the adhesive particles X. In this way, by adjusting the particle size to the optimum range as described above by using some particles in the aerosol undiluted solution as the floating particles Y, behavior different from that of the adhesive particles X is exhibited, and adhesion Together with the sex particles X, mosquitoes can be effectively knocked down or killed.

As shown in FIG. 1B, the adhesive particles X and the floating particles Y described above are exposed in the processing space immediately after the undiluted aerosol solution is injected once into the processing space. , the suspended particles Y begin to diffuse throughout the processing space. After a while from the one injection, the adherent particles X are completely adhered to the exposed portion, and the adhered state is maintained. Mosquitoes resting on the exposed area are then knocked down or killed by the pest control component, as described above. On the other hand, the airborne particles Y spread evenly throughout the treatment space, and the pest control component gradually volatilizes, knocking down or killing mosquitoes flying in the treatment space. In addition, it is possible to prevent mosquitoes from entering the processing space. Even in the unlikely event that the mosquito enters the processing space, if the mosquito stops at the exposed portion in the processing space or approaches the vicinity of the exposed portion, the adhesive particles X attached to the exposed portion will be removed. It can be reliably knocked down or killed by the pest control component. Thus, in the mosquito-controlling aerosol according to the present invention, the particles formed from the jetted aerosol undiluted solution are two types of particles with different behaviors, so that each particle exists in an optimal state, and each It is possible to maximize the pest control effect by sharing the role of Therefore, the adhesive particles X and the floating particles Y exert an excellent control effect on both mosquitoes existing in the treatment space and mosquitoes trying to enter the treatment space, knocking down or killing them. can be made

Further, when the wind blows into the processing space, even if some of the floating particles Y are washed away by the wind, the adherent particles X remain in the exposed portion. As described above, most of the mosquitoes in the treatment space stay in the exposed area for a longer time, so if the adherent particles X can exhibit the desired effect, the amount of airborne particles Y will decrease. However, there is no concern that the control effect against mosquitoes will be inferior. Furthermore, some of the particles formed by the aerosol undiluted solution injected into the processing space are formed as floating particles Y, as in the conventional product. Therefore, the concentration of the aerosol undiluted solution (floating particles Y) diffused in the processing space is reduced by the amount of the adherent particles X, so the concentration in the processing space is lower than that of the conventional product. Therefore, the effects on humans and pets due to inhalation of the airborne particles Y are reduced, and the product can be provided as a safe product.

When the aerosol stock solution prepared above is sprayed into the treatment space once, the effect duration of the insect-controlling component is 20 hours or more for a space of 33 m ³ or less. Spaces of 33 m ³ or less include living rooms of 4.5 to 8 tatami mats (ceiling height of 2.5 m). Therefore, with the mosquito-controlling aerosol according to the present invention, the pest-controlling effect can be maintained for approximately one day in a normal living space such as a general house. Mosquitoes invade indoors day and night, and it ^is especially necessary to prevent them from sucking blood while sleeping. For example, if you inject it once before going to bed at night, the effect will last until the afternoon of the next day, and you can go to bed with peace of mind.

<Mosquito control method>
The mosquito control method of this configuration is carried out using the mosquito control aerosol described above. First, in a pressure container equipped with a fixed quantity injection valve containing an aerosol undiluted solution containing a pest control component and an organic solvent and a propellant, an injection button provided with an injection port connected to the fixed quantity injection valve is pressed. When pressed once, the undiluted aerosol solution is injected from the injection port into the processing space (injection step). At this time, as shown in FIG. 1(b), adherent particles X and floating particles Y are formed from the aerosol undiluted solution, and are jetted into the processing space. Adherent particles X adhere to exposed portions in the processing space, and floating particles Y float in the processing space. Adhesive particles X knock down or kill mosquitoes that are perched on surfaces such as walls, floors, and structures in the treatment space, or have an effect on mosquitoes that try to perch on these places. and expel it out of the processing space. On the other hand, the airborne particles Y can knock down or kill mosquitoes flying in the treatment space, and are also effective against mosquitoes trying to enter the treatment space, and enter the treatment space. control the intrusion of The pest control effect of the adherent particles X and the floating particles Y as described above lasts for a long time of 20 hours or more in a space of 33 m ³ or less. After the predetermined time has elapsed, the aerosol concentrate can be sprayed into the treatment space again to knock down or kill the mosquitoes.

In the mosquito-controlling aerosol according to the present invention, as described above, the duration of the pest-controlling component is 20 hours or longer for a space of 33 m ³ or less, which is about 1 day. Therefore, in the mosquito control method using this mosquito control aerosol, the operation can be completed only by executing the injection step of injecting once a day at a fixed time. In this way, anyone can easily inject the undiluted aerosol solution into the processing space, and it is possible to prevent missing the injection timing.

In order to confirm the mosquito-controlling effect of the mosquito-controlling aerosol of the present invention, a plurality of mosquito-controlling aerosols (Examples 1 to 10) having the characteristic configuration of the present invention were prepared, and the mosquito-controlling effect was confirmed. A test was conducted. For comparison, mosquito control aerosols (Comparative Examples 1 and 2) not having the features of the present invention were prepared, and the same mosquito control effect confirmation test was conducted.

As shown in Table 1 as Examples 1 to 10, mosquito control aerosols were prepared according to the composition and conditions of each example, and the following tests were performed. For Comparative Examples 1 and 2, mosquito control aerosols were prepared with the compositions and conditions shown in Table 1, and the same tests as in Examples were conducted. Table 2 shows the test results.
(1) Control effect on adult mosquitoes in a 25 m ³ room In the center of a closed 25 m ³ room, a mosquito control aerosol was sprayed diagonally upward once, and immediately after this, 50 Culex pipiens female adults were released. , all test mosquitoes were collected after 2 hours of exposure. In the meantime, the Culex pipiens female adults that fell and turned upside down were counted with the passage of time, and the _KT50 value was determined. Then, in the same room, the same operation was performed 10 hours, 14 hours, and 20 hours after one injection of the mosquito-controlling aerosol.
(2) Percentage of Airborne Particles Remaining in Air Towards the center of a closed room of 25 m ³ , a mosquito-controlling aerosol was sprayed diagonally upward once. 50 cm behind the center of the room (130 cm from the wall) and 120 cm above the floor, install an air collection tube (a glass tube filled with silica gel and stuffed with absorbent cotton at both ends), and connect it to a vacuum pump for spraying. After 2 hours had passed since then, a predetermined amount of air was sucked. The air collection tube was washed with acetone, and the amount of collected pest control components was analyzed by gas chromatography (manufactured by Shimadzu Corporation, model GC1700). Based on the obtained analytical values, the air concentration of the pest control component was calculated, and the ratio to the theoretical air concentration was determined as the air persistence rate.

From the results in Tables 1 and 2, when metoflurthrin and/or transfluthrin were used as pest control components (Examples 1 to 7, 9, and 10), the mosquito control aerosol was sprayed once and then The _KT50 value was maintained at a significant value even after 20 hours, demonstrating an excellent control effect. A small amount of profluthrin added to transfluthrin (Example 8) also exhibited an excellent control effect. As the organic solvent to be combined with the pest control component, a higher fatty acid ester having a total number of carbon atoms of 16 to 20 such as isopropyl myristate and a lower alcohol having a carbon number of about 2 to 3 such as ethanol are effective. I found out. On the other hand, in Comparative Examples 1 and 2, 10 hours after the mosquito control aerosol was injected once, the KT ₅₀ value was inferior to that of Examples, and after 14 hours, showed even worse results. After 20 hours, it was shown that the control effect against Culex pipiens female adults almost disappeared in all of the comparative examples.

Next, using mosquitoes different from those of Examples 1 to 10, a test was conducted to confirm the mosquito-controlling effect of the mosquito-controlling aerosol of the present invention. This test is referred to as Example 11.
In Example 11, the pest control component metofluthrin was dissolved in the organic solvent isopropyl palmitate to prepare an aerosol stock solution containing 36.0% by weight of metofluthrin. 4.0 mL of this aerosol undiluted solution and 16.0 mL of liquefied petroleum gas as a propellant were pressurized and filled into an aerosol container equipped with a constant injection valve to obtain the mosquito-controlling aerosol of the present invention. The volume ratio (a/b) of the aerosol stock solution (a) and the propellant (b) was adjusted to 20/80. Then, 0.1 mL of the undiluted aerosol solution was sprayed slightly obliquely upward in a 6 tatami mat room (approximately 25 m ³ ) having a ceiling height of 2.5 m, which was substantially sealed. At this time, the jetting force (25° C.) of the mosquito-controlling aerosol at a jetting distance of 20 cm was 1.4 g·f. The 90% particle diameter of the adhesive particles formed by the aerosol undiluted solution was 42 μm in the cumulative volume distribution at 25° C. and the injection distance of 15 cm.

Immediately after spraying the mosquito-controlling aerosol of Example 11, midges were released into the room, and the midges were immediately knocked down or killed. In addition, when the pest control ingredient (metoflurrin) remained in the air by the same method as in Examples 1 to 10, it was found to be 0.93%.

From the test results of Examples 1 to 11, according to the mosquito control aerosol of the present invention and the mosquito control method using the same, it exceeds 20 hours in a space of at least 25 m ³ (equivalent to about 6 tatami mats) It was found to exhibit an excellent control effect against mosquitoes over a long period of time. It was confirmed that the mosquito-controlling aerosol of the present invention exhibited mosquito-controlling effects for 20 hours or more even when the spatial volume of the treatment target was increased to 33 m ³ (equivalent to about 8 tatami mats). In addition, when a similar control effect confirmation test was conducted with respect to flying pests other than mosquitoes, it also showed a control effect for 4 hours or more in a space of 33 m ³ or less, making it extremely practical. turned out to be. Furthermore, a secondary effect of repelling crawling pests such as cockroaches, ants and beetles was also confirmed.

INDUSTRIAL APPLICABILITY According to the present invention, it is possible to provide an aerosol for controlling mosquitoes, which has a high control effect on mosquitoes, and a method for controlling mosquitoes using the same.

X adherent particles Y floating particles

Claims (10)

an aerosol undiluted solution containing a pest control component and an organic solvent (except when the organic solvent is ethanol) and a pressure container provided with a constant injection valve containing a propellant;
an injection button provided with an injection port connected to the fixed quantity injection valve;
A mosquito control aerosol comprising:
the pest control component comprises metoflurthrin and/or transfluthrin;
The aerosol stock solution contains 14.3% by weight or more of the pest control component,
The injection volume when the injection button is pressed once is 0.1 to 0.4 mL,
The injection force at the injection distance of 20 cm is adjusted to be 0.3 to 10.0 g f at 25 ° C,
At least a portion of the aerosol undiluted solution is ejected from the ejection port as adhesive particles adhering to exposed portions where mosquitoes stop in the treatment space,
An aerosol for controlling mosquitoes, wherein when the undiluted aerosol solution is sprayed into the treatment space once, the spray amount of the pest control component is adjusted to 5.0 to 30 mg per 4.5 to 8 tatami mats. The anti-mosquitoes according to claim 1, wherein the volume ratio (a/b) between the aerosol stock solution (a) and the propellant (b) enclosed in the pressure container is 10/90 to 35/65. aerosol. 3. The mosquito-controlling aerosol according to claim 1, wherein the aerosol concentrate contains 26.7% by weight or more of the insect-controlling component. The mosquito according to any one of claims 1 to 3, wherein the duration of effect of the pest control component is 10 hours or more for a space of 33 m ³ or less when the aerosol undiluted solution is injected into the treatment space once. Aerosol for pest control. The mosquito according to any one of claims 1 to 3, wherein when the undiluted aerosol solution is sprayed into the treatment space once, the duration of effect of the pest control component is 20 hours or more for a space of 33 m ³ or less. Aerosol for pest control. The mosquito-controlling aerosol according to any one of claims 1 to 5, wherein the injection port has a diameter of 0.2 to 1.0 mm. 7. The method according to any one of claims 1 to 6, wherein when the aerosol undiluted solution is injected into the treatment space once, the pest control component has a residual rate in the air after 2 hours of 0.05 to 5%. Aerosol for mosquito control. The mosquito-controlling aerosol according to any one of claims 1 to 7, wherein the spray particles containing the adhesive particles have a 90% particle diameter of 14 to 73 nm in a volume cumulative distribution at 25 ° C. and a spray distance of 15 cm. . A mosquito control method comprising using the mosquito control aerosol according to any one of claims 1 to 8 and injecting the aerosol undiluted solution into a treatment space to knock down or kill mosquitoes. 10. The method for controlling mosquitoes according to claim 9, wherein the undiluted aerosol solution is injected into the treatment space once every 24 hours.

Images