Aerosol for mosquito control

Abstract

The objective is to provide a mosquito control aerosol that can exert excellent control effects against mosquitoes over a long period of time, while also reducing the impact on humans and pets, and a mosquito control method using said mosquito control aerosol. [Solution] A mosquito control aerosol comprising an aerosol concentrate containing an insecticide component and an organic solvent, a pressure-resistant container equipped with a metered-dose spray valve containing a propellant, and a spray button equipped with a spray nozzle connected to the metered-dose spray valve, wherein the spray volume when the spray button is pressed once is 0.1 to 0.4 mL, and the spray force at a spray distance of 20 cm is adjusted to be 0.3 to 10.0 g·f at 25°C, and the aerosol concentrate is sprayed from the spray nozzle as adhesive particles X, at least a portion of which adhere to exposed parts in the treatment space.

Description

[Technical Field]

[0001] The present invention relates to a mosquito control aerosol comprising an aerosol concentrate containing an insecticide component and an organic solvent, a pressure-resistant container equipped with a metering spray valve containing a propellant, and a spray button equipped with a spray nozzle connected to the metering spray valve, and a mosquito control method using the same. [Background technology]

[0002] Methods for controlling flying insects include, for example, vaporizing insecticides from a carrier impregnated with an insecticide into the treatment area, directly spraying insecticides onto flying insects, and pre-spraying insecticides in areas where flying insects are likely to appear. Regarding these methods, aerosol insecticides containing insecticides have been developed as products for controlling flying insects that enter indoors. Aerosol insecticides are widely used as convenient products because they allow for easy spraying of insecticides into the treatment area.

[0003] Conventionally, there have been aerosol insecticides that suppress the decrease in the remaining amount of the insecticide in the indoor air (see, for example, Patent Document 1). According to Patent Document 1, by keeping the insecticide in the air after it is released and suppressing the decrease in airborne concentration, it is possible to maintain a sufficient extermination effect against mosquitoes hiding in shaded areas.

[0004] Furthermore, there was an aerosol insecticide in which the particle size when the insecticide was sprayed into a room was set to be larger than that of Patent Document 1 (see, for example, Patent Document 2). Patent Document 2 is an aerosol insecticide based on a similar technical concept to Patent Document 1, and aims to enhance the insecticidal effect against mosquitoes by keeping the insecticide in the air in the room for as long as possible.

[0005] On the other hand, regarding aerosol insecticides, there was a method for controlling flying insects inside a house, characterized by applying the aerosol insecticide to the surface of indoor structures or fixtures (see, for example, Patent Document 3). According to Patent Document 3, because a specific compound applied to indoor structures etc. evaporates, it is possible to efficiently control flying insects inside a house by simple means without requiring repeated spraying or continuous operation of electrical appliances, etc. [Prior art documents] [Patent Documents]

[0006] [Patent Document 1] Japanese Patent Publication No. 2001-17055 [Patent Document 2] Japanese Patent Publication No. 2013-99336 [Patent Document 3] Japanese Patent Publication No. 2001-328913 [Overview of the project] [Problems that the invention aims to solve]

[0007] The aerosol insecticide described in Patent Document 1 attempts to extend the duration of the insecticide's effect by adjusting the particle size of the insecticide particles diffused into the room, thereby increasing the time the insecticide remains in the air. However, the airborne retention rate of insecticide particles after 12 hours from the start of treatment is 0.5% or more, and the aerosol insecticide described in Patent Document 1, which aims to maintain the airborne retention rate, has a limited duration of effect. In Patent Document 2, the airborne retention rate of insecticide particles is the same as in Patent Document 1, and it is not an aerosol insecticide that can be expected to have a long duration of effect.

[0008] Here, among the mosquito species targeted for control (including not only common mosquitoes such as Culex pipiens and Aedes albopictus, but also midges and drain flies belonging to the suborder Culex mosquitoes), Culex pipiens and Aedes albopictus are particularly important because they not only suck blood but also transmit infectious diseases. Therefore, it is necessary to protect oneself from these mosquitoes, and there is a growing need to establish more effective control methods than ever before. Since mosquitoes are flying pests that invade indoors day and night, an insecticide that is effective for 24 hours, or throughout the day, would be ideal.

[0009] However, as mentioned above, the aerosol insecticides disclosed in Patent Document 1 and Patent Document 2 only have an effect that lasts for about 12 hours. Furthermore, while Patent Document 1 and Patent Document 2 actively leave the insecticide in the air by adjusting the particle size of the insecticide, the fact that the insecticide particles remain in the air means that people and pets in the treated space are exposed to the insecticide for a long period of time. Therefore, in terms of the impact on the human body and pets, these are not desirable aerosol insecticides.

[0010] It is unclear whether the pest control method described in Patent Document 3 can maintain a stable effect over a long period of time. It is thought that the chemical particles sprayed into the air will follow one of the following behaviors: (A) remain suspended in the air, (B) adhere to floors and walls, (C) volatilize again after (B), or (D) decompose and disappear due to light, etc. In light of these, the pest control method described in Patent Document 3 falls under type (C). However, when the chemical that adheres to indoor structures etc. volatilizes again into the air, it is easily affected by temperature, airflow, etc., so the pest control method described in Patent Document 3 may not necessarily provide a stable effect against flying insects.

[0011] This invention has been made in view of the above-mentioned problems, and aims to provide a mosquito control aerosol that can exert excellent control effects over a long period of time, particularly against mosquitoes among flying insect pests, and that reduces the impact on humans and pets, as well as a mosquito control method using said mosquito control aerosol.

Means for Solving the Problem

[0012] The characteristic configuration of the aerosol for mosquito control according to the present invention for solving the above problems is as follows: A pressure-resistant container provided with a metering injection valve enclosing an aerosol stock solution containing a pest control component and an organic solvent, and an aerosolizing agent, An injection button provided with an injection port connected to the metering injection valve, An aerosol for mosquito control provided with, When the injection button is pressed once, the injection volume is adjusted to be 0.1 to 0.4 mL, and the injection force at an injection distance of 20 cm is adjusted to be 0.3 to 10.0 g·f at 25°C, At least a part of the aerosol stock solution is injected as adhering particles that adhere to the exposed part in the treatment space from the injection port.

[0013] As described in "Problems to be Solved by the Invention", the development of conventional aerosol insecticides has been advanced in the direction of actively diffusing drug particles in the treatment space and making the time remaining in the air as long as possible. However, if the residence time of the drug particles floating in the treatment space becomes long, when people or pets enter the treatment space, there is a possibility of inhaling the drug particles, so there is concern about the impact on health. By the way, according to the research of the present inventors, it has been found that mosquitoes, represented by mosquitoes (hereinafter, simply referred to as "mosquitoes" in the present invention), spend more time stopping on walls and the like than flying. That is, most of the mosquitoes that have entered the room stop on walls and the like, waiting for an opportunity to suck blood from people. For this reason, the method of extending the time during which drug particles float in the treatment space as in the past can have a certain effect on controlling flying mosquitoes, but it cannot sufficiently exert the effect of the drug on mosquitoes stopping on walls and the like, and as a result, the control of mosquitoes may be incomplete. From the above research results, the present inventors considered that enhancing the control effect on mosquitoes stopping on walls and the like would lead to an improvement in the overall control of mosquitoes entering the room while suppressing people and pets from inhaling the drug. Therefore, in the aerosol for mosquito control according to the present invention, at least a part of the aerosol stock solution sprayed into the treatment space is formed as adhesive particles that adhere to the exposed parts in the treatment space (for example, the floor surface, wall surface, and surfaces of structures such as furniture existing in the treatment space). For this reason, it is possible to effectively knockdown or kill both mosquitoes that are staying on the exposed parts and mosquitoes that are flying in the treatment space, and the control effect on the entire mosquitoes can be improved. Further, even if particles other than the adhesive particles (hereinafter referred to as "floating particles") diffuse evenly throughout the treatment space, the concentration of the aerosol stock solution in the treatment space is reduced by the amount of the adhesive particles. Therefore, the amount of particles of the aerosol stock solution inhaled by people and pets in the treatment space becomes extremely small, and it becomes an aerosol for mosquito control that is safer for the human body and pets. In addition, the aerosol for mosquito control according to the present invention is adjusted such 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. By adjusting the injection volume and the injection force in this way, at least a part of the sprayed aerosol stock solution can be formed as adhesive particles, and an excellent control effect on mosquitoes can be achieved.

[0014] In the aerosol for mosquito control according to the present invention, it is preferable that the 90% particle diameter in the volume integration distribution of the adhesive particles at 25°C and an injection distance of 15 cm is 20 to 80 μm.

[0015] According to the aerosol for mosquito control having this configuration, by adjusting the adhesive particles to the above optimal range, it is possible to surely knockdown or kill the mosquitoes staying on the exposed parts by the pest control component of the adhesive particles.

[0016] In the aerosol for mosquito control 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 parts in the treatment space.

[0017] With this mosquito control aerosol configuration, by adjusting the amount of adhesive particles to the optimal range described above, mosquitoes resting on exposed areas can be reliably knocked down or killed by the insecticidal components of the adhesive particles.

[0018] In the mosquito control aerosol according to the present invention, The volume ratio (a / b) of the aerosol concentrate (a) and the propellant (b) sealed in the pressure-resistant container is preferably 10 / 90 to 50 / 50.

[0019] With this mosquito control aerosol configuration, when the volume ratio (a / b) of the aerosol concentrate (a) to the propellant (b) is within the above range, the adhesive particles formed from the sprayed aerosol concentrate are in an optimal state. As a result, the adhesive particles can reliably reach exposed areas within the treated space, and the airborne particles can float in the treated space in amounts that do not affect humans or pets.

[0020] 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.

[0021] In this mosquito control aerosol, 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 effects of each component can be efficiently exerted. Furthermore, when the aerosol concentrate is sprayed, adhesive particles can be formed in a well-balanced manner, resulting in a stable mosquito control effect.

[0022] In the mosquito control aerosol according to the present invention, The aforementioned pest control component has a vapor pressure of 2 × 10 at 30°C. -4 ~1 × 10 -2 It is preferable that the value be mmHg.

[0023] According to this mosquito control aerosol, the insecticide component has a vapor pressure of 2 × 10 at 30°C. -4 ~1 × 10 -2 The product utilizes an ingredient with mmHg. With such an insecticide ingredient, when the aerosol concentrate is sprayed, it can optimally form adhesive particles. Furthermore, when combined with other ingredients, the aforementioned organic solvents, and propellants, an effective mosquito control aerosol can be achieved.

[0024] In the mosquito control aerosol according to the present invention, When the aerosol concentrate is sprayed once into the treatment space, the duration of the effect of the pest control component is 33m 3 For the following spaces, a duration of 20 hours or more is preferable.

[0025] In the methods for controlling mosquitoes using aerosol insecticides disclosed in Patent Documents 1 and 2, the duration of the effect of the agent was stated to be 12 hours. However, with the mosquito control aerosol according to the present invention, a single spray of the aerosol concentrate into the treatment space is sufficient to control mosquitoes for 33m². 3 The following areas can be kept pest-controlling for more than 20 hours, or approximately 24 hours.

[0026] In the mosquito control aerosol according to the present invention, The nozzle is preferably 0.2 to 1.0 mm in diameter.

[0027] With this mosquito control aerosol, the nozzle diameter is set within the optimal range described above, allowing for appropriate adjustment of the particle size and spray force of the aerosol concentrate, and enabling the formation of adhesive particles in an optimal state. As a result, the pest control components can be effectively utilized.

[0028] The characteristic configuration of the mosquito control method according to the present invention, which solves the above problems, is as follows: The method involves using any one of the mosquito control aerosols described above to spray the aerosol concentrate into the treatment space, thereby knocking down or killing mosquitoes.

[0029] Since the method for controlling mosquitoes according to this configuration is carried out using the aerosol for controlling mosquitoes of the present invention, it can exhibit the same excellent mosquito control effect as the above-described aerosol for controlling mosquitoes.

[0030] In the method for controlling mosquitoes according to the present invention, It is preferable to carry out the injection of the aerosol stock solution into the treatment space once every 24 hours.

[0031] As described above, the aerosol for controlling mosquitoes according to the present invention has a persistence time of the pest control component of 20 hours or more, which is approximately one day. Therefore, using this aerosol for controlling mosquitoes, the injection of the aerosol stock solution into the treatment space can be carried out once every 24 hours. By implementing such a method for controlling mosquitoes, the pest control effect can be sustained over the living time zone by simply injecting at a fixed time once a day.

Brief Description of the Drawings

[0032] [Figure 1] FIG. 1 is a model diagram showing the behavior of the particles of the aerosol stock solution when the aerosol stock solution is injected into the treatment space.

Modes for Carrying Out the Invention

[0033] The aerosol for controlling mosquitoes of the present invention includes a pressure-resistant container provided with a metering injection valve enclosing an aerosol stock solution containing a pest control component and an organic solvent, and an injection button provided with an injection port connected to the metering injection valve. Hereinafter, the aerosol for controlling mosquitoes of the present invention will be described. However, the present invention is not intended to be limited to the configurations described in the following embodiments and drawings.

[0034] <Aerosol stock solution> [Pest control component] One of the main components of the aerosol stock solution, the pest control component, has a vapor pressure at 30 °C of 2×10 -4 ~1×10 -2Use a substance with a concentration of mmHg. Metofluthrin, transfluthrin, and the like are suitably selected as such insecticidal components. These insecticidal components can be used individually or in mixtures. Note that metofluthrin and transfluthrin have optical and geometric isomers based on chiral carbons, and these are also included in the present invention.

[0035] The content of the insecticide component in the aerosol concentrate is preferably 1.0 to 50% by weight, taking into consideration that it will be sprayed into the treatment space after being dissolved in an organic solvent. Within this range, the insecticide component dissolves easily in the organic solvent, and when the aerosol concentrate is sprayed, at least a portion will form as adhesive particles, and the remaining particles will easily form as floating particles (adhesive particles and floating particles will be described in detail later). If the content of the insecticide component in the aerosol concentrate is less than 1.0% by weight, the insecticide component cannot be effectively exerted, and the mosquito control effect will be insufficient. On the other hand, if the content of the insecticide component in the aerosol concentrate exceeds 50% by weight, the concentration of the insecticide component becomes high, making it difficult to properly prepare the aerosol concentrate.

[0036] As described above, the insecticide component contained in the mosquito control aerosol of the present invention has a vapor pressure of 2 × 10 at 30°C. -4 ~1 × 10 -2 While compounds with mmHg (such as metofluthrin and transfluthrin) are preferred, it is also possible to include, in addition to these components, pyrethroid compounds such as profluthrin and empenthrin, other pyrethroid compounds such as phthalthrin, resmethrin, cyfluthrin, phenothrin, permethrin, cyphenothrin, cypermethrin, allethrin, prallethrin, flamethrin, imiprothrin, etofenprox, silicon compounds such as silafluofen, organophosphorus compounds such as dichlorvos and fenitrothion, and carbamate compounds such as propoxur.

[0037] The insecticide component is adjusted so that, after one spray of the aerosol concentrate into the treated space, the residual rate in the air (in the treated space) after 2 hours is 0.05 to 5%. The residual rate in the air is expressed as the ratio of the number of particles (Q) present in the treated space after a predetermined time to the number of particles (P) present in the treated space immediately after spraying, i.e., Q / P × 100 (%). However, it can be simply determined from the theoretical airborne concentration of the insecticide component and the airborne concentration of the insecticide component after a predetermined time, as explained in the examples below. The amount of insecticide component sprayed in this case is for a 4.5 to 8 tatami mat area (approximately 18.5 to 33.0 m²). 3 The concentration is adjusted to 5.0-30 mg per cubic meter. Within this range, the aerosol concentrate forms adhesive particles in an optimal state, allowing it to exert its pest control effect. Furthermore, even with the relatively low residual rate mentioned above, it can effectively knock down or kill mosquitoes. Moreover, it can be used safely as there is no risk of harm to people or pets if they inhale it within the treated space.

[0038] [Organic solvents] The organic solvent, which is another main component of the aerosol concentrate, can be used to prepare the aerosol concentrate by dissolving the above-mentioned pest control components, and when the prepared aerosol concentrate is sprayed into the treatment space, it is used to form optimal particles. Preferred organic solvents are higher fatty acid esters and alcohols. Preferred higher fatty acid esters have a total of 16 to 20 carbon atoms, such as isopropyl myristate, butyl myristate, hexyl laurate, and isopropyl palmitate. Of these, isopropyl myristate is particularly preferred. Preferred alcohols have 2 to 3 carbon atoms. For organic solvents, hydrocarbon solvents such as n-paraffins and isoparaffins, glycol ethers with 3 to 6 carbon atoms, and ketone solvents can also be mixed.

[0039] [Other ingredients] In addition to the above components, the mosquito control aerosol of the present invention may also appropriately contain acaricides, fungicides targeting molds and fungi, antibacterial agents, fungicides, fragrances, deodorizers, stabilizers, antistatic agents, defoamers, excipients, etc. Examples of acaricides include 5-chloro-2-trifluoromethanesulfonamide methyl benzoate, phenyl salicylate, and 3-iodo-2-propynyl butylcarbamate. Examples of fungicides, antibacterial agents, and fungicides include hinokitiol, 2-mercaptobenzothiazole, 2-(4-thiazolyl)bentwimidazole, 5-chloro-2-methyl-4-isothiazolin-3-one, triforin, 3-methyl-4-isopropylphenol, and ortho-phenylphenol. Examples of fragrances include aromatic components such as 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 alcohol, amyl cinnamic aldehyde, cumin aldehyde, and benzyl acetate, as well as fragrance components containing green leaf alcohol and green leaf aldehyde, which are referred to as "green scents."

[0040] <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, nitrous oxide, and compressed air. The above propellants can be used individually or in mixtures, but those with LPG as the main component are easier to use.

[0041] The mosquito control aerosol of the present invention is adjusted so that the volume ratio (a / b) of the aerosol concentrate (a) to the propellant (b) is between 10 / 90 and 50 / 50. By adjusting within this range, at least a portion of the aerosol concentrate can be formed as adhesive particles. This ensures that the adhesive particles can reliably reach exposed areas within the treatment space, and that the floating particles can float in the treatment space in amounts that do not affect humans or pets. In this way, the adhesive particles are present in an optimal state, and the pest control effect can be maximized. If the proportion of propellant (b) is increased relative to a volume ratio (a / b) of 10 / 90, that is, if a large amount of propellant is sealed in the pressure-resistant container, the sprayed aerosol concentrate becomes finer than necessary, reducing the amount of adhesive particles. As a result, there may be insufficient adhesive particles to adhere to exposed areas within the treatment space, making it impossible to reliably control mosquitoes resting on those exposed areas. On the other hand, if the volume ratio (a / b) is 50 / 50, and the proportion of propellant (b) is reduced, that is, if the amount of propellant sealed in the pressure vessel is reduced, it becomes difficult to form the sprayed aerosol concentrate into adhesive particles having the particle size within the optimal range described above. As a result, the aerosol concentrate settles immediately after being sprayed. Consequently, the amount of adhesive particles adhering to exposed areas in the treatment space becomes insufficient, making it difficult to knock down or kill mosquitoes early.

[0042] <Aerosol for mosquito control> As described above, an aerosol product is completed by selecting pest control components, organic solvents, propellants, and other components as needed, and sealing them in a pressure-resistant container. This aerosol product is the mosquito control aerosol of the present invention, and sprays the aerosol concentrate into a treatment space. The aerosol concentrate mainly consists of pest control components and organic solvents, and strictly speaking is separate from the propellant, but since the aerosol concentrate is released to the outside of the pressure-resistant container at the same time as the propellant, in the following description, the aerosol contents including the aerosol concentrate and propellant may be treated as "aerosol concentrate". Now, let's describe the spray valve provided in the mosquito control aerosol according to the present invention. The mosquito control aerosol according to the present invention mainly consists of a pressure-resistant container (aerosol container), a metered spray valve, and a spray button. The metered spray valve is connected to a spray button, which is an operating part for spraying the aerosol concentrate, and the spray button is provided with a nozzle from which the aerosol concentrate is ejected from the aerosol container to the outside (treatment space).

[0043] When the spray button of a mosquito control aerosol is pressed once, the pressure of the propellant activates the metering valve, causing the aerosol concentrate in the pressure-resistant container to rise to the nozzle and be sprayed into the treatment area. The spray volume of the aerosol concentrate at this time is adjusted to 0.1 to 0.4 mL, more preferably to 0.2 to 0.4 mL. Within this range, at least a portion of the aerosol concentrate is formed as adhesive particles. If the spray volume is less than 0.1 mL, the spray volume is too small, and the adhesive particles will not adhere sufficiently to exposed areas in the treatment area, making it difficult to knock down or kill mosquitoes resting on those areas. Also, since there will be fewer airborne particles, it will be difficult to knock down or kill mosquitoes flying in the treatment area. On the other hand, if it exceeds 0.4 mL, more aerosol concentrate than necessary will be released into the treatment area, making it difficult for people or pets to enter the treatment area, and the amount of aerosol concentrate used will be excessive, which is also economically disadvantageous.

[0044] The aerosol for mosquito control is adjusted so that the spray force is 0.3 to 10.0 g·f at a distance of 20 cm from the nozzle at 25°C. Within this range, a single spray allows the adhesive particles formed from the aerosol concentrate to smoothly reach exposed areas within the treated space, enabling the pest control components to exert their effect. Furthermore, it is preferable to set the nozzle diameter to 0.2 to 1.0 mm. Within this range, the particle size and spray force can be appropriately adjusted, and at least a portion of the aerosol concentrate sprayed into the treated space is optimally formed as adhesive particles, exhibiting a pest control effect and reliably knocking down or killing mosquitoes within the treated space.

[0045] Figure 1 is a model diagram showing the behavior of aerosol concentrate particles when the aerosol concentrate is sprayed into a treatment space. Figure 1(a) is a model diagram of a conventional mosquito control aerosol sprayed into a treatment space, and Figure 1(b) is a model diagram of a mosquito control aerosol sprayed according to the present invention into a treatment space. As shown in Figure 1(a), conventional aerosol products for mosquito control (simply referred to as "conventional products") work by spraying the aerosol concentrate into a treatment space, which then disperses into particles M with a particle size of less than 20 μm. After some time has passed since spraying, the particles M further disperse throughout the treatment space, releasing the insecticide components. This can knock down or kill mosquitoes flying in the treatment space. However, as mentioned above, mosquitoes spend more time resting on exposed parts of the treatment space than flying, so conventional products cannot reliably knock down or kill mosquitoes resting on these exposed parts of the treatment space. Furthermore, if wind blows in by opening a window in the treatment space, some of the particles M floating in the treatment space will be carried away by the wind, significantly reducing the effectiveness of the insecticide components. Moreover, if the particles M remain suspended in the treatment space for a long time, the amount of particles M inhaled by people and pets in the treatment space increases, which may have adverse effects on their health. Therefore, after diligent research, the inventors have developed an aerosol product for mosquito control that solves these problems. Below, we will describe the characteristic components of the mosquito control aerosol product according to the present invention: adhesive particles and suspended particles.

[0046] [Adhering particles] As shown in Figure 1(b), when the aerosol concentrate is sprayed once into the treatment space, adhesive particles X and suspended particles Y are formed. In Figure 1(b), the white circles indicate adhesive particles X, and the black circles indicate suspended particles Y. The particle sizes of the two are different, with adhesive particles X being larger in diameter than suspended particles Y. The preferred particle size for adhesive particles X is 20-80 μm for the 90% particle diameter in the volume integrated distribution at 25°C and a spray distance of 15 cm. Within this range, when the aerosol concentrate is sprayed into the treatment space, the particles can quickly move to and adhere to exposed areas within the treatment space. Therefore, mosquitoes resting on exposed areas can be knocked down or killed by the insecticidal components of the adhesive particles X. Furthermore, it also exerts an insecticidal effect on mosquitoes that have entered the treatment space and are trying to rest on exposed areas, making it possible to drive them out of the treatment space. If the particle size is less than 20 μm, the particles are too small to reach exposed areas, making it difficult to control mosquitoes that are resting or attempting to rest on those areas. On the other hand, if the particle size exceeds 80 μm, the particles are too large, making it difficult to control the behavior of the adhesive particles and making it difficult to properly adhere them to exposed areas. A more preferable particle size for adhesive particles X is a 90% particle diameter of 25-70 μm in the volume integrated distribution at 25°C and a spray distance of 15 cm.

[0047] Furthermore, the preferred amount of adhesive particles X attached to the exposed portion within the processing space is 1 m 2 The amount is 0.01 to 0.4 mg per unit, preferably 1 m 2 The amount is 0.05 to 0.2 mg per square meter. Within this range, mosquitoes resting on exposed areas can be effectively knocked down or killed. 2If the amount is less than 0.01 mg per square meter, it will not be able to provide sufficient control against mosquitoes resting on exposed areas, making it difficult to knock down or kill them. On the other hand, if the amount applied is 1 m 2 Even exceeding 0.4 mg per unit does not significantly improve pest control effectiveness, and the amount of undiluted aerosol solution used becomes excessive, making it economically disadvantageous.

[0048] [Suspended particles] The preferred particle size for the suspended particles Y is less than 20 μm in the 90% particle diameter of the volume integrated distribution at 25°C and a spray distance of 15 cm. Within this range, when the aerosol concentrate is sprayed into the treatment space, it can quickly diffuse and become suspended in the treatment space. Therefore, mosquitoes flying in the treatment space can be knocked down or killed by the insecticide components of the suspended particles Y. It is also effective against mosquitoes attempting to enter the treatment space, thus suppressing their entry. If the particle size of the suspended particles Y is 20 μm or larger, it functions as an adhering particle X. In this way, by adjusting the particle size of some of the particles in the aerosol concentrate to the optimal range described above as suspended particles Y, it exhibits different behavior from the adhering particles X, and together with the adhering particles X, it can effectively knock down or kill mosquitoes.

[0049] As shown in Figure 1(b), immediately after a single spray of the aerosol concentrate into the treatment space, the adhesive particles X move quickly toward exposed areas within the treatment space, while the floating particles Y begin to diffuse throughout the entire treatment space. After some time has passed since the initial spray, the adhesive particles X have completed their adhesion to the exposed areas and remain attached. As described above, they knock down or kill mosquitoes resting on the exposed areas with the insecticide components. Meanwhile, the floating particles Y diffuse evenly throughout the treatment space, and the insecticide components gradually volatilize, knocking down or killing mosquitoes flying around the treatment space. Furthermore, it is possible to prevent mosquitoes from entering the treatment space. Even if a mosquito does manage to enter the treatment space, if it lands on an exposed area within the treatment space or approaches the vicinity of an exposed area, it can be reliably knocked down or killed by the insecticide components of the adhesive particles X attached to the exposed area. Thus, the mosquito control aerosol according to the present invention consists of two types of particles with different behaviors, which are formed from the sprayed aerosol concentrate. As a result, each particle exists in an optimal state and performs its respective role to maximize the pest control effect. Therefore, the adhesive particles X and the suspended particles Y provide excellent control effects against both mosquitoes present in the treated space and mosquitoes attempting to enter the treated space, enabling knockdown or death.

[0050] Furthermore, if wind blows into the treatment space, even if some of the airborne particles Y are carried away by the wind, the adhesive particles X remain on the exposed areas. As described above, since most mosquitoes in the treatment space spend more time on the exposed areas, if the adhesive particles X can exert the desired effect, there is no need to worry about a decrease in the mosquito control effect even if the amount of airborne particles Y decreases. In addition, as with conventional products, some of the particles formed by the aerosol concentrate sprayed into the treatment space are formed as airborne particles Y. Therefore, the concentration of the aerosol concentrate (airborne particles Y) diffused in the treatment space is reduced by the amount of adhesive particles X, resulting in a lower concentration in the treatment space compared to conventional products. Consequently, the impact on humans and pets from inhaling airborne particles Y is reduced, and the product can be provided as a safe product.

[0051] When the aerosol concentrate prepared above is sprayed once into the treatment space, the duration of the pest control component's effect is 33m 3 For the following space, the duration is 20 hours or more: 33m 3 The following spaces include living rooms of 4.5 to 8 tatami mats (ceiling height 2.5 m). Therefore, the mosquito control aerosol according to the present invention can maintain its pest control effect for approximately 24 hours in a normal living space such as an ordinary house. Mosquitoes enter indoors day and night, and it is especially necessary to prevent them from biting your blood while you are sleeping, but 33m 3 Because the pest control ingredients remain effective for over 20 hours in the following areas, for example, if you spray it once before going to bed at night, the effect will last until the afternoon of the next day, allowing you to sleep with peace of mind.

[0052] <Mosquito control methods> The mosquito control method described above is carried out using the mosquito control aerosol described above. First, in a pressure-resistant container equipped with a metered-dose spray valve that contains an aerosol concentrate containing insecticide components and an organic solvent, and a propellant, pressing the spray button, which is provided with a spray nozzle connected to the metered-dose spray valve, once causes the aerosol concentrate to be sprayed from the nozzle into the treatment space (spraying step). At this time, as shown in Figure 1(b), adhesive particles X and floating particles Y are formed from the aerosol concentrate and sprayed into the treatment space. The adhesive particles X adhere to exposed parts in the treatment space, and the floating particles Y float in the treatment space. The adhesive particles X knock down or kill mosquitoes that are resting on surfaces such as walls, floors, and structures in the treatment space, or they are effective against mosquitoes that try to rest on these places, driving them out of the treatment space. On the other hand, the airborne particles Y can knock down or kill mosquitoes flying in the treated space, and are also effective against mosquitoes attempting to enter the treated space, suppressing their entry. The pest control effect of the attached particles X and airborne particles Y described above is 33m 3 It provides long-lasting effects for over 20 hours in the following areas. After the specified time has elapsed, the aerosol concentrate can be sprayed again into the treated area to knock down or kill mosquitoes.

[0053] As described above, the mosquito control aerosol according to the present invention has a duration of action of the insect control component of 33m 3 The recommended duration of exposure in the following area is 20 hours or more, which is approximately one day. Therefore, with this mosquito control method using this mosquito control aerosol, the operation can be completed simply by performing a spraying process once a day at a fixed time. In this way, anyone can easily spray the aerosol concentrate into the treatment area, and it is possible to prevent missing the spraying timing. [Examples]

[0054] To confirm the mosquito control effect of the mosquito control aerosol of the present invention, several mosquito control aerosols (Examples 1-10) possessing the characteristic configuration of the present invention were prepared, and a mosquito control effect confirmation test was conducted. For comparison, mosquito control aerosols without the characteristic configuration of the present invention (Comparative Examples 1-2) were also prepared, and a similar mosquito control effect confirmation test was conducted.

[0055] As shown in Table 1, aerosols for mosquito control were prepared according to the composition and conditions of each example (Examples 1-10), and the tests described below were conducted. For Comparative Examples 1-2, aerosols for mosquito control were also prepared according to the composition and conditions shown in Table 1, and the same tests as in the examples were conducted. The test results are shown in Table 2. (1) 25m 3 Effectiveness against adult mosquitoes in this room Closed 25m 3 In the center of the room, a mosquito-control aerosol was sprayed once diagonally upwards. Immediately afterward, 50 female Culex mosquitoes were released and exposed for 2 hours, after which all test mosquitoes were collected. During this time, the number of female Culex mosquitoes that fell and rolled over was counted. 50 The values ​​were determined. Then, in the same room, the same procedure was performed 10 hours, 14 hours, and 20 hours after one spray of mosquito repellent aerosol. (2) Percentage of suspended particles remaining in the air Closed 25m 3 A mosquito repellent aerosol was sprayed once diagonally upwards towards the center of the room. An air collection tube (a glass tube filled with silica gel and both ends packed with cotton wool) was placed 50 cm behind the center of the room (130 cm from the wall) and 120 cm above the floor, connected to a vacuum pump, and a predetermined amount of air was drawn in 2 hours after the spraying process. The air collection tube was cleaned with acetone, and the amount of insecticide components collected was analyzed by gas chromatography (Shimadzu Corporation, model GC1700). Based on the obtained analytical values, the airborne concentration of the insecticide components was calculated, and the ratio to the theoretical airborne concentration was determined as the airborne retention rate.

[0056] [Table 1]

[0057] [Table 2]

[0058] From the results in Tables 1 and 2, when metofluthrin and / or transfluthrin were used as the pest control component (Examples 1-7, 9, 10), 20 hours after one spray of mosquito control aerosol, KT 50 The values ​​remained at a significant level, indicating excellent control efficacy. The addition of a small amount of profluthrin to transfluthrin (Example 8) also demonstrated excellent control efficacy. Furthermore, it was found that higher fatty acid esters with a total of 16-20 carbon atoms, such as isopropyl myristate, and lower alcohols with approximately 2-3 carbon atoms, such as ethanol, were effective organic solvents to combine with the pest control component. On the other hand, in Comparative Examples 1-2, 10 hours after one spray of the mosquito control aerosol, KT 50 The values ​​were inferior compared to the examples, and after 14 hours, the results were even worse. After 20 hours, it was shown that the control effect against adult female Culex pipiens mosquitoes had almost completely disappeared in all of the comparative examples.

[0059] Next, a test was conducted to confirm the mosquito control effect of the mosquito control aerosol of the present invention, using mosquitoes different from those used in Examples 1 to 10. This test is designated as Example 11. In Example 11, the insecticide 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 stock solution and 16.0 mL of liquefied petroleum gas as a propellant were pressurized and filled into an aerosol container equipped with a metering valve to obtain the mosquito control aerosol of the present invention. The volume ratio (a / b) of the aerosol stock solution (a) to the propellant (b) was adjusted to 20 / 80. The above mosquito control aerosol was then placed in a roughly sealed 6-tatami mat room (approximately 25 m²) with a ceiling height of 2.5 m. 30.1 mL of the aerosol concentrate was sprayed slightly upward at an angle. The spray force (25°C) of the mosquito control aerosol at a spray distance of 20 cm was 1.4 g·f. The 90% particle size in the volume integrated distribution of the adhesive particles formed by the aerosol concentrate at 25°C and a spray distance of 15 cm was 42 μm.

[0060] Immediately after spraying the mosquito-control aerosol of Example 11, when midges were released into the room, the midges were immediately knocked down or killed. Furthermore, the airborne retention rate of the insecticide component (metofluthrin) was determined using the same method as in Examples 1 to 10, and it was found to be 0.93%.

[0061] From the test results of Examples 1 to 11, the mosquito control aerosol of the present invention and the mosquito control method using the same are effective in controlling at least 25 m 3 It has been revealed that the aerosol for mosquito control of this invention provides excellent control effects against mosquitoes for a long period of time exceeding 20 hours in a space (equivalent to approximately 6 tatami mats). 3 Even when expanded to an area equivalent to approximately 8 tatami mats, it was confirmed to provide mosquito control for more than 20 hours. Furthermore, when similar control tests were conducted on other flying insects besides mosquitoes, it was confirmed to be effective against flies as well, up to 33m. 3 It demonstrated pest control effectiveness for over four hours in the following areas, proving to be highly practical. Furthermore, a secondary effect of repelling crawling pests such as cockroaches, ants, and cigarette beetles was also confirmed. [Industrial applicability]

[0062] According to the present invention, it is possible to provide a mosquito control aerosol that has a high control effect against mosquitoes, and a mosquito control method using the same. [Explanation of Symbols]

[0063] X Adhering particles Y Suspended particles

Claims

1. A pressure-resistant container equipped with a metering spray valve containing an aerosol concentrate containing an insecticide and an organic solvent, and a propellant, A spray button provided with a spray nozzle connected to the aforementioned quantitative injection valve, A mosquito control aerosol equipped with, The aforementioned pest control component includes transfluthrin and / or metofluthrin. When the aforementioned spray button is pressed once, the spray volume is 0.1 to 0.2 mL. The aerosol concentrate contains 26.7% by weight or more of the insecticide component. When the aerosol concentrate is sprayed once into the treatment space, the airborne residue rate of the pest control component after 2 hours is 0.05 to 5%. When the aerosol concentrate is sprayed once into the treatment space, the duration of the pest control component's effect is 33m. ３ Aerosol for mosquito control that is effective for 20 hours or more in the following areas.

2. When the aerosol concentrate is sprayed once into the treatment space, the amount of the pest control component sprayed is 4.5 to 8 tatami mats (18.5 to 33.0 m²). ３ The aerosol for mosquito control according to claim 1, which is adjusted to 5.0 to 30 mg per )

3. The aerosol for mosquito control according to claim 1 or 2, wherein the organic solvent is a lower alcohol having 2 to 3 carbon atoms.

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