Mosquito control aerosol and mosquito control method

Abstract

To provide a mosquito control aerosol that can exert a superior control effect to mosquitoes over a long period of time, and further has a reduced effect on humans and pet animals, and to provide a mosquito control method using the mosquito control aerosol.SOLUTION: There is provided a mosquito control aerosol including: a pressure vessel provided with a quantitative injection valve enclosing an aerosol stock solution containing a pest control component and a higher fatty acid ester, and a propellant; and an injection button provided with an injection orifice connected to the quantitative injection valve. An injection volume when the injection button is pushed down once is adjusted to become 0.1 to 0.4 mL, and the injection force at an injection distance of 20 cm is adjusted to become 0.3 to 10.0 g f at 25°C. The aerosol stock solution is injected from the injection orifice as adhesive particles X, wherein at least one part of the aerosol stock solution adheres to an exposed part in a space to be treated.SELECTED DRAWING: Figure 1

Description

[Technical Field]

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

[0002] Methods for exterminating flying pests include, for example, a method in which the agent containing an insecticidal component is evaporated from a carrier impregnated with the agent and volatilized into the treatment space, a method in which the agent is directly sprayed onto the flying pests, and a method in which the agent is sprayed in advance in places where flying pests are likely to appear. With regard to these methods, aerosol insecticides containing insecticidal components have been developed as products for exterminating flying pests 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.

[0003] Conventionally, there have been aerosol insecticides that suppress the decrease in the residual rate of the insecticide in the air indoors (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 its concentration in the air, it is possible to maintain a sufficient extermination effect against mosquitoes hiding in the shadows.

[0004] There is also an aerosol insecticide in which the particle size when sprayed indoors is set larger than that of Patent Document 1 (see, for example, Patent Document 2). Patent Document 2 is an aerosol insecticide based on the same technical concept as Patent Document 1, and aims to leave the insecticide in the air indoors for as long as possible, thereby increasing its insecticidal effect against mosquitoes.

[0005] Meanwhile, there is a method for exterminating flying pests in a house using aerosol insecticides, characterized by attaching the insecticide to the surface of indoor structures or fixtures (see, for example, Patent Document 3). According to Patent Document 3, a specific compound attached to indoor structures or the like evaporates, so that flying pests in a house can be efficiently exterminated by a simple means without the need for repeated spraying or continuous operation of electrical appliances or the like. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Japanese Patent Application Laid-Open No. 2001-17055 [Patent Document 2] Japanese Patent Application Laid-Open No. 2013-99336 [Patent Document 3] Japanese Patent Application Laid-Open No. 2001-328913 Summary of the Invention [Problem to be solved by the invention]

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

[0008] Of the mosquitoes targeted for control (which includes not only ordinary mosquitoes such as Culex pipiens and Aedes albopictus, but also chironomids and moth flies belonging to the suborder Culicidae), Culex pipiens and Aedes albopictus in particular are mosquitoes that not only suck blood but also transmit infectious diseases, so it is necessary to protect ourselves from these mosquitoes, and there is a demand for the establishment of more effective extermination methods than ever before.Mosquitoes are flying pests that invade indoors at any time of the day or night, so an insecticide that is effective all day, in other words, that lasts for 24 hours, is ideal.

[0009] However, as mentioned above, the aerosol insecticides disclosed in Patent Documents 1 and 2 only remain effective for about 12 hours. Furthermore, Patent Documents 1 and 2 actively allow the insecticide to remain in the air by adjusting the particle size of the insecticide, but the fact that the insecticide particles remain in the air means that the insecticide is inhaled by people and pets in the treatment space for a long period of time. Therefore, in terms of the effects on the human body and pets, these aerosol insecticides are hardly desirable.

[0010] It is unclear whether the extermination method of Patent Document 3 can maintain a stable effect over a long period of time. It is believed that the pesticide particles sprayed into the air follow one of the following behaviors: (A) remain suspended in the air, (B) adhere to the floor or wall, (C) volatilize again after (B), or (D) decompose and disappear due to exposure to light, etc. In light of these, the extermination method of Patent Document 3 falls into type (C). However, when the pesticide adhered to indoor structures, etc. volatilizes again into the air, it is easily affected by temperature, air volume, etc., and therefore, the extermination method of Patent Document 3 may not necessarily be stable in exterminating flying pests.

[0011] The present invention has been made in consideration of the above-mentioned problems, and aims to provide a mosquito control aerosol that can exert an excellent control effect against flying pests, particularly mosquitoes, for a long period of time, while reducing the impact on the human body and pets, and a mosquito control method using the mosquito control aerosol. [Means for solving the problem]

[0012] The characteristic configuration of the mosquito control aerosol according to the present invention to solve the above problems is as follows: a pressure-resistant container provided with a metered-dose injection valve and configured to contain an aerosol concentrate containing a pest control component and an organic solvent, and a propellant; an injection button provided with an injection port connected to the metered injection valve; A mosquito control aerosol comprising: The spray volume when the spray button is pressed once is adjusted to 0.1 to 0.4 mL, and the spray force at a spray distance of 20 cm is adjusted to 0.3 to 10.0 g·f at 25°C. The aerosol concentrate is sprayed from the spray nozzle as adhesive particles, at least a part of which adheres to the exposed portion in the processing space.

[0013] As mentioned in "Problems to be Solved by the Invention," conventional aerosol insecticides have been developed to actively diffuse drug particles into the treatment space, and to prolong the time they remain in the air as much as possible. However, if the drug particles remain suspended in the treatment space for a long time, there is a risk that people or pets who enter the treatment space may inhale the drug particles, which could have an adverse effect on their health. Meanwhile, research by the present inventors has revealed that mosquitoes, such as mosquitoes (hereinafter, in this invention, simply referred to as "mosquitoes"), spend more time resting on walls and other surfaces than flying. This means that the majority of mosquitoes that invade indoors rest on walls and other surfaces, waiting for an opportunity to feed on human blood. Therefore, while conventional methods of prolonging the time that drug particles remain suspended in the treatment space can be effective to a certain extent in controlling flying mosquitoes, they are unable to fully control mosquitoes resting on walls and other surfaces, resulting in incomplete mosquito control. Based on these research results, the present inventors believed that improving the control effect against mosquitoes resting on walls and other surfaces would lead to improved control of all mosquitoes that invade indoors, while preventing people and pets from inhaling the drug. Therefore, in the mosquito control aerosol of the present invention, at least a portion of the aerosol concentrate sprayed into the treatment space is formed as adhesive particles that adhere to exposed areas within the treatment space (e.g., floors, walls, furniture, and other structural surfaces within the treatment space). This effectively knocks down or kills both mosquitoes resting on exposed areas and mosquitoes flying through the treatment space, improving the overall mosquito control effect. Furthermore, even if particles other than adhesive particles (hereinafter referred to as "floating particles") are dispersed evenly throughout the treatment space, the concentration of the aerosol concentrate in the treatment space is reduced by the amount of the adhesive particles. Therefore, the amount of particles of the aerosol concentrate inhaled by people or pets in the treatment space is extremely small, making the mosquito control aerosol safer for people and pets. Furthermore, the mosquito control aerosol according to the present invention is adjusted so that 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 0.3 to 10.0 g·f at 25° C. By adjusting the spray volume and spray force in this manner, at least a portion of the sprayed aerosol concentrate can be formed as adhesive particles, thereby achieving excellent mosquito control effects.

[0014] In the aerosol for mosquito control according to the present invention, The adhesive particles preferably have a 90% particle size of 20 to 80 μm in terms of volume cumulative distribution at 25° C. and a spray distance of 15 cm.

[0015] According to the mosquito control aerosol of this configuration, by adjusting the adhesive particles to the above-mentioned optimal range, mosquitoes resting on exposed areas can be reliably knocked down or killed by the pest control components of the adhesive particles.

[0016] In the aerosol for mosquito control according to the present invention, The amount of the adhesive particles attached to the exposed part in the processing space is 1 m 2 It is preferable that the amount is 0.01 to 0.4 mg per unit area.

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

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

[0019] When the volume ratio (a / b) of the aerosol concentrate (a) to the propellant (b) of the mosquito control aerosol of this configuration is within the above-mentioned range, the adhesive particles formed from the sprayed aerosol concentrate are in an optimal state, which allows the adhesive particles to reliably reach exposed areas in the treatment space, and allows the floating particles to float in the treatment space in an amount that does not affect the human body or pets.

[0020] In the aerosol for mosquito control 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 the mosquito control 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 effects of each component can be efficiently exerted. Furthermore, when the aerosol concentrate is sprayed, adhesive particles can be formed in a balanced manner, resulting in a stable mosquito control effect.

[0022] In the aerosol for mosquito control according to the present invention, The pest control ingredient has a vapor pressure of 2×10 at 30°C. -4 ~1×10 -2 Preferably, it is in mmHg.

[0023] In the mosquito control aerosol of this configuration, the pest control ingredient has a vapor pressure of 2×10 at 30°C. -4 ~1×10 -2 The pest control ingredient has a viscosity of 1000 psi (1000 psi) mmHg. When sprayed as an undiluted aerosol, this pest control ingredient can optimally form adhesive particles. Furthermore, when formulated with other ingredients besides the pest control ingredient, the organic solvent, and the propellant, an effective mosquito control aerosol can be achieved.

[0024] In the aerosol for mosquito control 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 ingredient is 33 m 3 It is preferable that the time is 20 hours or more for the following spaces.

[0025] In the methods for exterminating mosquitoes using aerosol insecticides disclosed in Patent Documents 1 and 2, the duration of the effect of the agent is 12 hours. However, with the aerosol for mosquito control according to the present invention, the aerosol concentrate can be sprayed into the treatment space just once, resulting in an effective effect of 33 m. 3 The pest control effect can be maintained for more than 20 hours, i.e., for almost a whole day, in the following spaces:

[0026] In the aerosol for mosquito control according to the present invention, The nozzle preferably has a nozzle diameter of 0.2 to 1.0 mm.

[0027] With the mosquito control aerosol of this configuration, the nozzle diameter is set within the above-mentioned optimal range, so that the particle diameter and spray force of the aerosol concentrate can be appropriately adjusted, and adhesive particles can be formed in an optimal state, thereby achieving the effectiveness of the pest control ingredient.

[0028] The characteristic configuration of the mosquito control method according to the present invention for solving the above problems is as follows: The object of the present invention is to use any one of the above-described aerosols for mosquito control and spray the aerosol concentrate into a treatment space to knock down or kill mosquitoes.

[0029] The mosquito control method of this configuration is carried out using the mosquito control aerosol of the present invention, and therefore can achieve the same excellent mosquito control effect as the mosquito control aerosol described above.

[0030] In the mosquito control method according to the present invention, It is preferable to spray the aerosol concentrate into the treatment space once every 24 hours.

[0031] As described above, the mosquito control aerosol of the present invention has a duration of effect of the pest control component of 20 hours or more, approximately one day. Therefore, using this mosquito control aerosol, the aerosol concentrate can be sprayed into the treatment space once every 24 hours. By carrying out such a mosquito control method, the pest control effect can be maintained throughout the day by simply spraying the aerosol once a day at a fixed time. [Brief explanation of the drawings]

[0032] [Figure 1] FIG. 1 is a model diagram showing the behavior of particles of an aerosol concentrate when the aerosol concentrate is sprayed into a treatment space. DETAILED DESCRIPTION OF THE INVENTION

[0033] The mosquito control aerosol of the present invention comprises a pressure-resistant container equipped with a metered-dose injection valve that contains an aerosol concentrate containing a pest control ingredient and an organic solvent, and a propellant, and a spray button equipped with an injection port connected to the metered-dose injection valve. The mosquito control aerosol of the present invention will be described below. However, the present invention is not intended to be limited to the configurations shown in the following embodiments and drawings.

[0034] <Concentrated aerosol> [Pest control ingredient] The pest control ingredient, which is one of the main components of the aerosol concentrate, has a vapor pressure of 2 x 10 at 30°C. -4 ~1×10 -2mmHg. As such a pest control component, metofluthrin, transfluthrin, etc. are preferably selected. These pest control components can be used either alone or in a mixed state. Note that metofluthrin and transfluthrin exist as optical isomers and geometric isomers based on asymmetric carbons, and these are also included in the present invention.

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

[0036] As described above, the pest control ingredient contained in the mosquito control aerosol of the present invention has a vapor pressure of 2×10 at 30° C. -4 ~1×10 -2 mmHg (metofluthrin, transfluthrin, etc.), but in addition to these ingredients, it is also possible to contain pyrethroid compounds such as profluthrin and empenthrin, other pyrethroid compounds such as phthalthrin, resmethrin, cyfluthrin, fenothrin, permethrin, cyphenothrin, cypermethrin, allethrin, prallethrin, furamethrin, imiprothrin, etofenprox, silicon compounds such as silafluofen, organophosphorus compounds such as dichlorvos and fenitrothion, carbamate compounds such as propoxur, etc.

[0037] The pest control ingredient is adjusted so that when the aerosol concentrate is sprayed once into the treatment space, the residual rate in the air (in the treatment 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 treatment space after a predetermined time has elapsed to the number of particles (P) present in the treatment space immediately after spraying, i.e., Q / P × 100 (%). However, as will be explained in the examples below, it can be calculated simply from the theoretical air concentration of the pest control ingredient and the air concentration of the pest control ingredient after a predetermined time has elapsed. The amount of pest control ingredient sprayed in this case is 4.5 to 8 tatami mats (approximately 18.5 to 33.0 m). 3 The concentration is adjusted to 5.0 to 30 mg per 1000 ml of the aerosol concentrate. Within this range, adhesive particles are optimally formed by the aerosol concentrate, enabling pest control effects to be achieved. Even with a relatively low residual rate as described above, mosquitoes can be effectively knocked down or killed. Furthermore, even if people or pets in the treatment space inhale the aerosol, there is no risk of harm to the human body or pets, making it safe to use.

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

[0039] [Other ingredients] In addition to the above-mentioned components, the mosquito control aerosol of the present invention can also contain, as appropriate, acaricides, antifungal agents for fungi and molds, antibacterial agents, bactericides, fragrances, deodorizers, stabilizers, antistatic agents, antifoaming agents, excipients, etc. Examples of acaricides include 5-chloro-2-trifluoromethanesulfonamidomethyl benzoate, phenyl salicylate, and 3-iodo-2-propynyl butylcarbamate. Examples of antifungal agents, antibacterial agents, and bactericides include hinokitiol, 2-mercaptobenzothiazole, 2-(4-thiazolyl)benzimidazole, 5-chloro-2-methyl-4-isothiazolin-3-one, triforine, 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 leaf alcohol and leaf aldehyde, known as the "green scent."

[0040] <Propellant> 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, etc. The above propellants can be used alone or in a mixture, but those containing LPG as the main component are easy to use.

[0041] The mosquito control aerosol of the present invention is prepared so that the volume ratio (a / b) of the aerosol concentrate (a) to the propellant (b) is adjusted to 10 / 90 to 50 / 50. Adjusting the ratio within this range allows at least a portion of the aerosol concentrate to be formed as adhesive particles. This ensures that the adhesive particles reach the exposed areas within the treatment space, and that the floating particles remain suspended in the treatment space in an amount that does not harm humans or pets. Thus, the adhesive particles are present in an optimal state, maximizing the pest control effect. If the ratio of the propellant (b) is increased relative to a volume ratio (a / b) of 10 / 90, i.e., if a large amount of propellant is enclosed in the pressure-resistant container, the sprayed aerosol concentrate will be atomized more than necessary, resulting in a decrease in the number of adhesive particles. This results in a lack of adhesive particles adhering to the exposed areas within the treatment space, which may result in insufficient control of mosquitoes resting on the exposed areas. On the other hand, if the volume ratio (a / b) is 50 / 50 and the proportion of propellant (b) is reduced, i.e., if the amount of propellant enclosed in the pressure-resistant container is reduced, it becomes difficult to form the sprayed concentrate aerosol into adhesive particles having a particle size within the above-mentioned optimal range, and the concentrate aerosol settles immediately after spraying. As a result, the amount of adhesive particles that adhere to exposed areas in the treatment space becomes insufficient, making it difficult to quickly knock down or kill mosquitoes.

[0042] <Mosquito control aerosol> As described above, an aerosol product is completed by selecting the pest control ingredient, organic solvent, propellant, and other optional ingredients and sealing them in a pressure-resistant container. This aerosol product is the mosquito control aerosol of the present invention, which sprays a concentrated aerosol solution into a treatment space. The concentrated aerosol solution is primarily composed of the pest control ingredient and an organic solvent and is technically distinct from the propellant. However, since the concentrated aerosol solution is released to the outside of the pressure-resistant container simultaneously with the propellant, the aerosol contents including the concentrated aerosol solution and the propellant may be referred to as the "concentrate aerosol solution" in the following description. Here, the spray valve included in the mosquito control aerosol of the present invention will be described. The mosquito control aerosol of the present invention is primarily composed of a pressure-resistant container (aerosol container), a metered-dose spray valve, and a spray button. The metered-dose spray valve is connected to a spray button, which is an actuator for spraying the concentrated aerosol solution, and the spray button is provided with a spray nozzle through which the concentrated aerosol solution is sprayed from the aerosol container to the outside (treatment space).

[0043] When the spray button of a mosquito control aerosol is pressed once, the propellant pressure activates the metered spray valve, causing the aerosol concentrate in the pressure-resistant container to rise to the nozzle and be sprayed into the treatment space. The spray volume of the aerosol concentrate is adjusted to 0.1 to 0.4 mL, and more preferably 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 adhesive particles do not sufficiently adhere to the exposed areas in the treatment space, making it difficult to knock down or kill mosquitoes that are resting on the exposed areas. In addition, the number of floating particles is reduced, making it difficult to knock down or kill mosquitoes flying through the treatment space. On the other hand, if the spray volume exceeds 0.4 mL, more aerosol concentrate than necessary is released into the treatment space, making it difficult for people and pets to enter the treatment space and requiring excessive amounts of aerosol concentrate, which is economically disadvantageous.

[0044] Mosquito control aerosols are adjusted to have a spray force of 0.3 to 10.0 g·f at 25°C at a distance of 20 cm from the nozzle. Within this range, adhesive particles formed from the aerosol concentrate can be smoothly delivered to exposed areas in the treatment space with a single spray, allowing the pest control ingredients to exert their effects. Furthermore, the nozzle diameter of the nozzle is preferably set to 0.2 to 1.0 mm. Within this range, the particle diameter and spray force can be appropriately adjusted, ensuring that at least a portion of the aerosol concentrate sprayed into the treatment space is optimally formed as adhesive particles, thereby exerting pest control effects and reliably knocking down or killing mosquitoes in the treatment space.

[0045] Figure 1 shows a model diagram illustrating the behavior of particles of aerosol concentrate when the concentrate is sprayed into a treatment space. Figure 1(a) is a model diagram illustrating the behavior of particles of aerosol concentrate when a conventional mosquito control aerosol is sprayed into a treatment space, and Figure 1(b) is a model diagram illustrating the behavior of particles of aerosol concentrate when the concentrate is sprayed into a treatment space. As shown in Figure 1(a), when a conventional mosquito control aerosol product (simply referred to as the "conventional product") is sprayed into a treatment space, the aerosol concentrate disperses into particles M with a particle diameter of less than 20 μm. After a period of time has passed since spraying, the particles M further disperse throughout the treatment space, volatilizing the pest control ingredient. This knocks down or kills mosquitoes flying in the treatment space. However, as mentioned above, mosquitoes spend more time resting on exposed areas in the treatment space than they do flying. Therefore, conventional products cannot reliably knock down or kill mosquitoes that are resting on exposed areas in the treatment space. Furthermore, if wind blows in, such as when a window is opened, some of the particles M suspended in the treatment space will be blown away by the wind, significantly reducing the effectiveness of the pest control ingredient. Furthermore, if particles M remain suspended in the treatment space for a long period of time, the amount of particles M inhaled by people and pets in the treatment space increases, which may have adverse effects on the human body and pets. Therefore, after extensive research, the present inventors have developed an aerosol product for mosquito control that solves these problems. The adhesive particles and floating particles that are characteristic components of the aerosol product for mosquito control according to the present invention will be described below.

[0046] [Adhesive particles] As shown in FIG. 1(b), when the aerosol concentrate is sprayed once into the treatment space, adhesive particles X and floating particles Y are formed. In FIG. 1(b), the white circles represent adhesive particles X, and the black circles represent floating particles Y. The two particles have different particle sizes, with adhesive particles X being larger than floating particles Y. The preferred particle size of adhesive particles X is 20 to 80 μm, as determined by the 90% particle size 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 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 pest control component of adhesive particles X. Furthermore, the pest control effect is also exerted on mosquitoes that have entered the treatment space and are attempting to rest on exposed areas, making it possible to expel them from the treatment space. If the particle diameter is less than 20 μm, the particle diameter is too small and it becomes difficult to reach the exposed area, resulting in difficulty in controlling mosquitoes that are resting on or attempting to rest on the exposed area. On the other hand, if the particle diameter exceeds 80 μm, the particle diameter is too large and it becomes difficult to control the behavior of the adhesive particles, making it difficult to properly adhere them to the exposed area. A more preferred particle diameter of the adhesive particles X is a 90% particle diameter of 25 to 70 μm in the volume cumulative distribution at 25°C and a spray distance of 15 cm.

[0047] The preferred amount of adhesive particles X to be attached to the exposed portion in the processing space is 1 m 2 The amount is 0.01 to 0.4 mg per m 2 Within this range, mosquitoes that land on exposed areas can be effectively knocked down or killed. 2If the amount is less than 0.01 mg per m, it will not be possible to exert a sufficient control effect on mosquitoes that are resting on exposed areas, making it difficult to knock down or kill the mosquitoes. 2 If the amount exceeds 0.4 mg per unit area, the pest control effect will not be significantly improved, and the amount of the aerosol concentrate used will be excessive, which is economically disadvantageous.

[0048] [Airborne particles] The preferred particle size of the floatable particles Y is a 90% particle size of less than 20 μm in the volume cumulative 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 quickly diffuses and becomes suspended in the treatment space. Therefore, the pest control components of the floatable particles Y can knock down or kill mosquitoes flying in the treatment space. Furthermore, since the floatable particles Y are also effective against mosquitoes attempting to invade the treatment space, it is possible to prevent their intrusion into the treatment space. When the particle size of the floatable particles Y is 20 μm or more, they function as adhesive particles X. Thus, by adjusting the particle size of some of the particles in the aerosol concentrate to the above-described optimal range, the floatable particles Y behave differently from the adhesive particles X, and together with the adhesive particles X, they can effectively knock down or kill mosquitoes.

[0049] As shown in FIG. 1(b), immediately after a single spray of the aerosol concentrate into the treatment space, the adhesive particles X quickly move toward the exposed areas within the treatment space, while the floating particles Y begin to diffuse throughout the treatment space. A short time after the single spray, the adhesive particles X complete their adhesion to the exposed areas and maintain their adhered state. As described above, the pest control component knocks down or kills mosquitoes that land on the exposed areas. Meanwhile, the floating particles Y diffuse evenly throughout the treatment space, gradually volatilizing the pest control component and knocking down or killing mosquitoes flying through the treatment space. Furthermore, it is possible to prevent mosquitoes from invading the treatment space. Even if a mosquito does invade the treatment space, if it lands on an exposed area within the treatment space or approaches the exposed area, it can be reliably knocked down or killed by the pest control component of the adhesive particles X that adhere to the exposed area. As described above, the mosquito control aerosol according to the present invention contains two types of particles formed from the sprayed aerosol concentrate, each of which behaves differently, so that each type of particle exists in an optimal state and can perform its respective role to maximize the pest control effect. Therefore, the adhesive particles X and the floating particles Y exert an excellent control effect on both mosquitoes present in the treatment space and mosquitoes attempting to invade the treatment space, knocking down or killing them.

[0050] Furthermore, when 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 in the exposed areas. As described above, since the majority of mosquitoes in the treatment space spend more time remaining in 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 is reduced. Furthermore, 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) diffusing in the treatment space is reduced by the amount of adhesive particles X, and the concentration in the treatment space is lower than with conventional products. Therefore, the impact on humans and pets caused by inhalation of airborne particles Y is reduced, and the product can be provided as a safe product.

[0051] When the above prepared aerosol concentrate is sprayed once into the treatment space, the effect of the pest control ingredient lasts for 33 minutes. 3 More than 20 hours for the following spaces: 33m 3 The following spaces include living rooms of 4.5 to 8 tatami mats in size (ceiling height 2.5 m). Therefore, the mosquito control aerosol of the present invention can maintain its pest control effect for almost the entire day in a normal living space such as a general house. Mosquitoes invade indoors at any time of the day and night, and it is particularly important to prevent them from biting your blood while you are sleeping. 3 The effectiveness of the pest control ingredients lasts for more than 20 hours in the following spaces, so 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 in peace.

[0052] <Mosquito control methods> The mosquito control method of this configuration is carried out using the above-mentioned mosquito control aerosol. First, in a pressure-resistant container equipped with a metered-dose injection valve containing an aerosol concentrate containing a pest control ingredient and an organic solvent, and a propellant, a spray button equipped with an injection port connected to the metered-dose injection valve is pressed once, and the aerosol concentrate is sprayed from the injection port 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 surfaces within 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 within the treatment space, or are effective against mosquitoes that are attempting to land on these surfaces, driving them out of the treatment space. On the other hand, the floating particles Y can knock down or kill mosquitoes flying in the treatment space, and are also effective against mosquitoes that try to invade the treatment space, preventing them from invading the treatment space. The pest control effect of the adhesive particles X and floating particles Y as described above is 33m 3 The effect lasts for a long period of time, more than 20 hours, in the following spaces: After the specified time has passed, the aerosol concentrate can be sprayed again into the treated space to knock down or kill the mosquitoes.

[0053] As described above, the mosquito control aerosol of the present invention has a duration of action of the pest control component of 33 minutes. 3 For the following spaces, the duration is 20 hours or more, or approximately one day. Therefore, with a mosquito control method carried out using this mosquito control aerosol, the operation can be completed simply by performing the spraying step of spraying once a day at a set time each day. In this way, anyone can easily spray the aerosol concentrate into the treatment space, and it is possible to prevent missing the timing of the spraying. [Example]

[0054] In order to confirm the mosquito control effect of the mosquito control aerosol of the present invention, several mosquito control aerosols (Examples 1 to 10) having the characteristic configuration of the present invention were prepared and a mosquito control effect confirmation test was carried out. For comparison, mosquito control aerosols (Comparative Examples 1 and 2) not having the characteristic configuration of the present invention were prepared and a similar mosquito control effect confirmation test was carried out.

[0055] As shown in Table 1 for Examples 1 to 10, mosquito control aerosols were prepared with compositions and conditions according to each Example, and the tests described below were carried out. For Comparative Examples 1 and 2, mosquito control aerosols were also prepared with compositions and conditions shown in Table 1, and tests similar to those for the Examples were carried out. The test results are shown in Table 2. (1) 25m 3 Control effect against adult mosquitoes in a room Closed 25m 3 In the center of the room, a mosquito control aerosol was sprayed once diagonally upward, and immediately after this, 50 adult female Culex pipiens mosquitoes were released and exposed for 2 hours, after which all the test mosquitoes were collected. During this time, the number of adult female Culex pipiens mosquitoes that fell and turned over was counted, and the KT 50 The same procedure was then repeated in the same room 10 hours, 14 hours, and 20 hours after the first spray of the mosquito control aerosol. (2) Airborne particle retention rate Closed 25m 3 The mosquito control aerosol was sprayed once diagonally upward toward the center of the room. An air collection tube (a glass tube filled with silica gel and plugged with absorbent cotton at both ends) 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 specified amount of air was sucked in two hours after the spraying treatment. The air collection tube was washed with acetone, and the amount of the captured pest control component was analyzed by gas chromatography (Shimadzu Corporation, Model GC1700). Based on the analytical values ​​obtained, the air concentration of the pest control component was calculated, and the ratio to the theoretical air concentration was calculated as the air 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 ingredient (Examples 1 to 7, 9, and 10), the KT 50 The values ​​were maintained at significant values, demonstrating excellent control effects. The addition of a small amount of profluthrin to transfluthrin (Example 8) also had excellent control effects. It was also found that, as organic solvents to be combined with pest control ingredients, higher fatty acid esters with a total of 16 to 20 carbon atoms, such as isopropyl myristate, and lower alcohols with approximately 2 to 3 carbon atoms, such as ethanol, are effective. Meanwhile, in Comparative Examples 1 and 2, the KT 50 The values ​​were inferior to those of the Examples, and after 14 hours the results were even worse. After 20 hours, the control effect against adult female Culex pipiens mosquitoes was almost completely lost in all the Comparative Examples.

[0059] Next, a test was conducted to confirm the mosquito control effect of the mosquito control aerosol of the present invention on mosquitoes different from those in Examples 1 to 10. This test is designated Example 11. In Example 11, the pest control ingredient metofluthrin was dissolved in the organic solvent isopropyl palmitate to prepare an aerosol concentrate containing 36.0% by weight of metofluthrin. 4.0 mL of this aerosol concentrate and 16.0 mL of liquefied petroleum gas as a propellant were pressurized and filled into an aerosol container equipped with a metered injection valve to obtain the mosquito control aerosol of the present invention. The volume ratio (a / b) of this aerosol concentrate (a) to the propellant (b) was adjusted to 20 / 80. The above mosquito control aerosol was then sprayed into a nearly sealed 6-tatami room (approximately 25 m) with a ceiling height of 2.5 m. 3), 0.1 mL of the undiluted aerosol was sprayed at a slight angle upward. The spray force (at 25°C) of the mosquito control aerosol at a spray distance of 20 cm was 1.4 g·f. The 90% particle size of the volume-integrated distribution of adhesive particles formed by the undiluted aerosol at 25°C and a spray distance of 15 cm was 42 μm.

[0060] Immediately after spraying the mosquito control aerosol of Example 11, chironomids were released into the room, and the chironomids were immediately knocked down or killed. Furthermore, the residual rate of the pest control ingredient (metofluthrin) in the air was determined using the same method as in Examples 1 to 10, and was found to be 0.93%.

[0061] From the test results of Examples 1 to 11, it was found that the mosquito control aerosol of the present invention and the mosquito control method using the same can effectively control mosquitoes for at least 25 m. 3 It was revealed that the mosquito control aerosol of the present invention exerted an excellent mosquito control effect for a long period of time of more than 20 hours in a space (equivalent to about 6 tatami mats) with a volume of 33 m. 3 Even when enlarged to an area equivalent to about 8 tatami mats, it was confirmed that the mosquito control effect lasted for more than 20 hours. In addition, when a similar test was conducted to confirm the control effect on flying pests other than mosquitoes, it was confirmed that the mosquito control effect lasted for 33 m against flies. 3 It was found to be highly practical, demonstrating a pest control effect of over four hours in the following spaces: Furthermore, it was confirmed to have the secondary effect of repelling crawling pests such as cockroaches, ants, and beetles. [Industrial Applicability]

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

[0063] X adhesive particles Y Floating particles

Claims

1. a pressure-resistant container provided with a metered-dose injection valve and configured to contain an aerosol concentrate containing a pest control component and an organic solvent, and a propellant; an injection button provided with an injection port connected to the metered injection valve; A mosquito control aerosol comprising: The injection volume when the injection button is pressed once is 0.1 to 0.4 mL, The aerosol concentrate contains, as the pest control ingredient, 26.7 to 35.0% by weight of transfluthrin and / or 6.2 to 27.5% by weight of metofluthrin, the aerosol concentrate is sprayed from the spray nozzle as adhesive particles, at least a part of which adheres to an exposed portion in the processing space; A mosquito control aerosol, wherein when the aerosol concentrate is sprayed once into a treatment space, the residual rate of the pest control ingredient in the air after 2 hours is 0.05 to 5%.

2. 2. The mosquito control aerosol according to claim 1, wherein the spray force at a spray distance of 20 cm is adjusted to 0.3 to 10.0 g·f (2.94×10 −3 to 9.81×10 −2 N) at 25°C.

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

4. The mosquito control aerosol according to any one of claims 1 to 3, wherein the mosquito is Culex pipiens pallens.

5. When the aerosol concentrate is sprayed once into the treatment space, the duration of the effect of the pest control component is 33 m. ３ The mosquito control aerosol according to any one of claims 1 to 4, which has a mosquito control effect of 10 hours or more in the following space:

6. When the aerosol concentrate is sprayed once into the treatment space, the duration of the effect of the pest control component is 33 m. ３ The mosquito control aerosol according to any one of claims 1 to 4, which has a mosquito control effect of 20 hours or more in the following space:

7. A mosquito control method comprising spraying the aerosol concentrate according to any one of claims 1 to 6 into a treatment space to knock down or kill mosquitoes.

8. The mosquito control method according to claim 7, wherein the aerosol concentrate is sprayed into the treatment space once every 24 hours.

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