JP6364070B2 - Mosquito control aerosol and mosquito control method - Google Patents

Description

  The present invention provides an aerosol stock solution containing a pest control component and an organic solvent, a pressure-resistant container provided with a metering injection valve encapsulating a propellant, and an injection provided with an injection port connected to the metering injection valve The present invention relates to a mosquito control aerosol provided with a button, and a mosquito control method using the same.

  As a method of extinguishing flying pests, for example, a method of evaporating a drug from a carrier impregnated with a drug containing an insecticidal component and volatilizing it into a treatment space, a method of spraying a drug directly on a flying pest, a place where a flying pest easily appears There is a method of spraying medicine in advance. Regarding these methods, aerosol pesticides containing insecticidal components have been developed as products for combating flying pests that enter indoors. Aerosol insecticides are widely used as easy-to-use products because they can easily spray insecticidal components into the treatment space.

  Conventionally, there has been an aerosol insecticide that suppresses a decrease in the residual rate of a drug in the indoor air (see, for example, Patent Document 1). According to Patent Document 1, after releasing a drug, it is possible to maintain a sufficient extermination effect against mosquitoes lurking in the shadows by keeping the drug in the air and suppressing a decrease in air concentration. Yes.

  Moreover, there existed aerosol insecticide which set the particle diameter at the time of spraying a chemical | medical agent indoors larger than patent document 1 (for example, refer patent document 2). Patent Document 2 is an aerosol insecticide based on the same technical idea as Patent Document 1, and attempts to increase the insecticidal effect against mosquitoes by allowing the drug to remain in the room air as long as possible.

  On the other hand, there has been a method for controlling flying insect pests in a house room characterized by being attached to the surface of indoor structures or fixtures with respect to aerosol pesticides (see, for example, Patent Document 3). According to Patent Document 3, a specific compound attached to an indoor structure or the like evaporates, so that repeated spraying or continuous operation of an electric appliance or the like is not required, and a house-flying insect pest is obtained by a simple means. It is said that it can be effectively removed.

JP 2001-17055 A JP 2013-99336 A JP 2001-328913 A

  The aerosol insecticide of Patent Document 1 has been attempted to lengthen the time that the drug remains in the air by adjusting the particle size of the drug that diffuses into the room, and to increase the duration of the drug. However, the residual rate of drug particles in the air at 12 hours or more from the start of treatment is 0.5% or more, and the aerosol insecticide of Patent Document 1 for the purpose of maintaining the residual rate in the air has a limit in duration. is there. Also in Patent Document 2, the in-air residual rate of drug particles is the same as that of Patent Document 1, and is not an aerosol insecticide that can be expected to have a long duration.

  Here, among the mosquitoes to be controlled (including common mosquitoes, Culex pipiens and Aedes albopictus, as well as chironomids and butterflies belonging to the mosquitoes), particularly Culex pipiens and Aedes albopictus are blood-sucking. In addition to the mosquitoes that transmit infections, it is necessary to protect themselves from these mosquitoes, and there is a need to establish more effective methods of extermination than ever before. Since mosquitoes are flying insects that invade indoors day and night, an insecticide that is effective throughout the day, that is, has a duration of 24 hours, is ideal.

  However, as described above, the aerosol insecticides disclosed in Patent Document 1 and Patent Document 2 only last for about 12 hours. In addition, Patent Document 1 and Patent Document 2 are those in which the drug is actively left in the air by adjusting the particle diameter of the drug, but that the drug particles remain in the air. This means that a person or pet in the processing space is left in an environment for inhaling the medicine for a long time. Therefore, it is difficult to say that it is a preferable aerosol insecticide in terms of influence on human bodies and pets.

  Even in the extermination method of Patent Document 3, it is unclear whether a stable effect can be maintained for a long time. Drug particles injected into the air are (A) floating and remaining in the air, (B) adhering to the floor or wall, (C) volatilizing again after (B), or (D) decomposing by light or the like It is considered to follow any behavior of disappearing. In light of these, the extermination method of Patent Document 3 corresponds to the type (C). However, when the chemical adhering to the indoor structure etc. is volatilized again in the air, it is easily affected by temperature, air volume, etc., so the extermination method of Patent Document 3 has a stable effect on the extermination of flying insects. It is not necessarily obtained.

  The present invention has been made in view of the above problems, and among the flying insect pests, in particular, can exert an excellent control effect against mosquitoes over a long period of time, and also to human bodies and pets. The purpose of the present invention is to provide an aerosol for controlling mosquitoes that reduces the influence of mosquitoes and a method for controlling mosquitoes using the aerosol for controlling mosquitoes.

The characteristic configuration of the aerosol for controlling mosquitoes according to the present invention for solving the above problems is as follows:
There is provided an aerosol stock solution containing metofluthrin and / or transfluthrin as a pest control component and a higher fatty acid ester having a total number of carbon atoms of 16 to 20 as an organic solvent, and a quantitative injection valve encapsulating a propellant. A pressure vessel,
An injection button provided with an injection port connected to the quantitative injection valve;
An aerosol for controlling mosquitoes comprising:
The volume ratio (a / b) of the aerosol stock solution (a) and the propellant (b) is 10/90 to 50/50,
The injection volume when the injection button is pressed once is 0.1 to 0.4 mL,
The particle diameter of the spray particles sprayed from the spray nozzle is 10 to 80 μm with a 90% particle diameter in a volume integrated distribution at 25 ° C. and a spray distance of 15 cm.
When the aerosol stock solution is sprayed once in the treatment space, the residual rate in the air after 2 hours of the pest control component is 0.05 to 5%, and the effect duration of the pest control component is 33 m ³ or less. It is that it is 20 hours or more with respect to the space.

As described in “Problems to be Solved by the Invention”, development of conventional aerosol insecticides is progressing in a way that positively diffuses the drug particles in the treatment space and extends the remaining time in the air as much as possible. It was done. However, if the residence time of the drug particles floating in the treatment space is long, there is a concern about the impact on health because there is a possibility of inhalation of the drug particles if a person or pet enters the treatment space. The
By the way, according to the researches of the present inventors, mosquitoes represented by mosquitoes (hereinafter, simply referred to as “mosquitoes” in the present invention) stays on the wall surface or the like rather than flying. Turned out to be longer. In other words, most of the mosquitoes that have invaded indoors stop on the wall surface, etc., and have given up the opportunity to suck blood. For this reason, the conventional method of prolonging the time during which the drug particles float in the processing space can have a certain effect on the control of mosquitoes in flight, but it can be stopped on the wall surface. The effect of the drug cannot be sufficiently exerted on the mosquitoes, and as a result, the control of the mosquitoes can be incomplete. Based on the above research results, the present inventors have found that increasing the effect of controlling mosquitoes that are stopped on the wall surface or the like suppresses inhalation of drugs by humans and pets, while entering mosquitoes. I thought it would lead to improved control of the whole species.

  Therefore, in the mosquito control aerosol of the present invention, when the aerosol solution is jetted into the processing space, the sprayed particles are exposed in the processing space (for example, floors and walls present in the processing space, furniture, etc. Moved to the surface of the structure, etc.) and adhered to the exposed part. This effectively knocks down or kills both mosquitoes that remain in the exposed area and mosquitoes that are flying in the treatment space, and can improve the overall mosquito control effect. it can. With regard to aerosol spray particles, the present inventors, after extensive studies, use metfurthrin and / or transfluthrin as a pest control component, and an aerosol using a higher fatty acid ester having a total number of carbon atoms of 16 to 20 as an organic solvent. They found that if the stock solution was used, particles suitable for mosquito control were formed. In this case, the effect of the pest control component contained in the spray particles can be reliably and efficiently exhibited. Moreover, the aerosol stock solution can be easily prepared.

  Subsequently, the volume ratio (a / b) of the aerosol stock solution (a) and the propellant (b) is 10/90 to 50/50, and the injection capacity when the injection button is pressed once is 0.1 to 0. When adjusted to 4 mL, the ejected particles quickly move to the exposed part in the processing space and adhere. As a result, it is possible to reliably knock down or kill mosquitoes that have stopped on the exposed portion by the pest control component.

  Furthermore, the particle diameter of the injection particles is formed such that the 90% particle diameter in a volume integrated distribution at 25 ° C. and an injection distance of 15 cm is in the range of 10 to 80 μm. If it is such a range, the mosquito which has stopped in the exposed part can be knocked down or killed reliably by a pest control component.

In addition, when the aerosol solution is sprayed once in the treatment space, the residual rate in the air (in the treatment space) after 2 hours of the pest control component is 0.05 to 5%, and the effect duration of the pest control component Is adjusted to be 20 hours or more for a space of 33 m ³ or less. If it is such a range, the injection | spray particle injected into process space will move to the exposed part in process space quickly, and will adhere. On the other hand, the ejected particles floating in the processing space are reduced by the amount of ejected particles adhering to the exposed portion. In other words, the aerosol for controlling mosquitoes according to the present invention does not diffuse the aerosol solution throughout the processing space as in the conventional product, so the risk of affecting the human body and pets is significantly reduced compared to the conventional product. It becomes. And the effect of knocking down or killing the mosquitoes flying in the processing space can also be exhibited by the pest control component of the spray particles floating in the processing space. Moreover, with the mosquito control aerosol according to the present invention, the aerosol stock solution is sprayed only once into the treatment space, and the pest control effect is approximately 20 hours or more in a space of 33 m ³ or less, that is, approximately one day. Can be sustained.

In the mosquito control aerosol according to the present invention,
As for the particle diameter of the said injection | spray particle injected from the said injection port, it is preferable that the 90% particle diameter in a volume integrated distribution in 25 degreeC and the injection distance of 15 cm is 25-70 micrometers.

  According to the aerosol for controlling mosquitoes of this configuration, the ejected particles are adjusted to the above optimal range, so that the ejected particles move and adhere to the exposed portion in the processing space quickly. For this reason, it is possible to knock down or kill mosquitoes that have stopped at the exposed portion more reliably.

In the mosquito control aerosol according to the present invention,
It is preferable that the injection volume when the injection button is pressed once is 0.1 to 0.2 mL.

  According to the aerosol for controlling mosquitoes of this configuration, by adjusting the injection capacity to the optimal range as described above, the injected spray particles are present in a more suitable state, and the effect of the pest control component is maximized. It can be demonstrated.

In the mosquito control aerosol according to the present invention,
It is preferable that the spray amount of the pest control component when the spray button is pressed once is 5.0 to 30 mg per 4.5 to 8 tatami mats.

  According to the aerosol for controlling mosquitoes of this configuration, since the injection amount of the pest control component when the injection button is pressed once is adjusted to be within the above optimal range, the injection particles are processed quickly. It moves and adheres to the exposed part in the space. As a result, it is possible to reliably knock down or kill mosquitoes that have stopped on the exposed portion by the pest control component.

In the mosquito control aerosol according to the present invention,
The higher fatty acid ester is preferably at least one selected from the group consisting of isopropyl myristate, butyl myristate, hexyl laurate, and isopropyl palmitate.

  According to the mosquito control aerosol of this configuration, when the higher fatty acid ester used as the organic solvent is at least one selected from the group consisting of the above components, the effect of the pest control component is more efficiently exhibited. be able to.

In the mosquito control aerosol according to the present invention,
The higher fatty acid ester is preferably isopropyl myristate.

  According to the mosquito control aerosol of this configuration, when the higher fatty acid ester employed as the organic solvent is isopropyl myristate, the effects of the pest control component can be more efficiently exhibited.

The characteristic configuration of the mosquito control method according to the present invention for solving the above problems is as follows:
Using the aerosol for controlling mosquitoes according to any one of the above, the aerosol stock solution is jetted into a treatment space to knock down or kill the mosquitoes.

  Since the mosquito control method of this structure is performed using the mosquito control aerosol of the present invention, the same excellent mosquito control effect as the above-described mosquito control aerosol can be achieved.

In the mosquito control method according to the present invention,
The aerosol stock solution is preferably sprayed once every 24 hours.

As described above, the aerosol for controlling mosquitoes according to the present invention has a duration of the insect-controlling component of 20 hours or more in a space of 33 m ³ or less, and is approximately one day. For this reason, by using this aerosol for controlling mosquitoes, it is possible to execute the injection of the aerosol solution into the treatment space once every 24 hours. If such a mosquito control method is executed, the pest control effect can be maintained over the life time period by simply spraying it once a day at a predetermined time.

FIG. 1 is a model diagram showing the behavior of spray particles when an aerosol stock solution is sprayed into a processing space.

  The aerosol for mosquito control according to the present invention is a pressure-resistant container provided with a fixed-quantity injection valve in which an aerosol stock solution containing a pest control component and a higher fatty acid ester used as an organic solvent, and a propellant is enclosed, and a fixed-quantity injection And an injection button provided with an injection port connected to the valve. Hereinafter, the mosquito control aerosol of the present invention will be described. However, the present invention is not intended to be limited to the configurations described in the embodiments and drawings described below.

<Aerosol stock solution>
[Pest control ingredients]
The pest control component which is one of the main components of the aerosol stock solution is preferably a pyrethroid insecticide component, and examples thereof include metfurthrin and transfluthrin. Metofluthrin and transfluthrin can be used either alone or in a mixed state. In addition, there are optical isomers and geometric isomers based on asymmetric carbon in metfurthrin and transfluthrin, which are also included in the present invention.

  The content of the pest control component in the aerosol stock solution is preferably 1.0 to 60% by weight in consideration of being injected into the treatment space after being dissolved in the higher fatty acid ester used as the organic solvent. . Within such a range, the pest control component is easily dissolved in the higher fatty acid ester (organic solvent), and when the aerosol stock solution is sprayed, the sprayed particles are formed in an optimal state, and the effect of the pest control component is achieved. Can play. When the content of the pest control component in the aerosol stock solution is less than 1.0% by weight, the pest control component cannot be exhibited effectively, and the mosquito control effect is insufficient. On the other hand, when the content of the pest control component in the aerosol stock solution exceeds 60% by weight, the concentration of the pest control component becomes high, making it difficult to prepare the aerosol stock solution appropriately.

  As described above, the pest control component contained in the mosquito control aerosol of the present invention is preferably metfurthrin and transfluthrin. In addition to these components, profluthrin, empentrin, phthalthrin, resmethrin, cyfluthrin, phenothrin, permethrin. Other pyrethroid compounds such as ciphenothrin, cypermethrin, allethrin, praretrin, framethrin, imiprotoline, etofenprox, silicon compounds such as silafluophene, organophosphorus compounds such as dichlorvos and fenitrothion, carbamate compounds such as propoxle, etc. It is also possible to contain.

  The pest control component is adjusted so that the residual ratio in the air (in the processing space) after 0.05 hours is 0.05 to 5% when the aerosol stock solution is sprayed once into the processing space. The residual ratio in the air is the ratio of the number of particles (Q) existing in the processing space after a lapse of a predetermined time to the number of particles (P) existing in the processing space immediately after injection, that is, Q / P × 100 (%). However, as will be described in the following examples, it can be simply calculated from the theoretical concentration of the pest control component in the air and the concentration of the pest control component in the air after a predetermined time has elapsed. The spray amount of the aerosol stock solution is preferably adjusted according to the type of pest control component contained in the aerosol stock solution. In a general living space (about 4.5 to 8 tatami mats), for example, when metfurthrin is used as a pest control component, since metfurthrin has a relatively strong activity (pest control effect), a small amount of injection (for example, as metfurthrin) Even 5.0 mg) can exert a significant effect. On the other hand, when transfluthrin is used as a pest control component, the transfluthrin activity is about 0.6 times that of metfurthrin, so it should be sprayed in a larger amount (eg, 30 mg as transfluthrin). Is preferred. Considering these, it is preferable to adjust the spray amount of the aerosol stock solution to 5.0 to 30 mg per 4.5 to 8 tatami as the spray amount of the pest control component. If it is such a range, an injection particle will be optimally formed from an aerosol stock solution, and a pest control effect can be exhibited. Moreover, even if it is a comparatively low residual rate in the air as described above, mosquitoes can be knocked down or killed effectively. Furthermore, even if a person or pet in the processing space inhales, there is no risk of affecting the human body or pet, and it can be used safely.

[Organic solvent]
The main component of the aerosol stock solution contains an organic solvent in addition to the above-mentioned pest control components. As the organic solvent, an aerosol stock solution can be prepared by dissolving the above-mentioned pest control components, and those which can form optimum spray particles when the prepared aerosol stock solution is jetted into the treatment space are used. In the mosquito control aerosol of the present invention, a higher fatty acid ester is used as the organic solvent. The higher fatty acid ester preferably has a total number of carbon atoms of 13 to 20, more preferably a total number of carbon atoms of 16 to 20, such as isopropyl myristate, butyl myristate, hexyl laurate, and palmitic acid. And isopropyl. Of these, isopropyl myristate is particularly preferred.

  Further, as the organic solvent, in addition to the above higher fatty acid ester, it is also possible to add a lower alcohol having 2 to 3 carbon atoms. For example, hydrocarbon solvents such as n-paraffin and isoparaffin, glycol ethers having 3 to 6 carbon atoms, ketone solvents, and the like can be mixed in the organic solvent.

[Other ingredients]
In addition to the above components, the aerosol for controlling mosquitoes of the present invention can also contain a nonionic surfactant as a solubilizing aid in the aerosol stock solution. Nonionic surfactants include, for example, polyoxyethylene alkyl ethers, polyoxyethylene alkyl phenyl ethers, polyoxyethylene polyoxypropylene alkyl ethers, polyoxyethylene alkylamino ethers and other ethers, polyethylene glycol fatty acids Examples include esters, polyoxyethylene sorbitan fatty acid esters, fatty acid esters such as polyoxyethylene glycerin fatty acid esters, polyoxyethylene styrenated phenols, polyalkalolamides of fatty acids, among which ethers are preferred Can be used for

  In addition, acaricides, fungicides, fungicides, fungicides, fragrances, deodorants, stabilizers, antistatic agents, antifoaming agents, excipients, etc. for fungi and fungi, etc. It can also be blended. Examples of the acaricide include methyl 5-chloro-2-trifluoromethanesulfonamide benzoate, phenyl salicylate, 3-iodo-2-propynyl butyl carbamate, and the like. Antifungal agents, antibacterial agents, and fungicides include hinokitiol, 2-mercaptobenzothiazole, 2- (4-thiazolyl) benzimidazole, 5-chloro-2-methyl-4-isothiazolin-3-one, trifolin, 3 -Methyl-4-isopropylphenol, ortho-phenylphenol and the like. As a fragrance, orange oil, lemon oil, lavender oil, peppermint oil, eucalyptus oil, citronella oil, lime oil, yuzu oil, jasmine oil, coconut oil, green tea essential oil, limonene, α-pinene, linalool, geraniol, phenylethyl Examples include aromatic components such as alcohol, amylcinnamic aldehyde, cumin aldehyde, and benzyl acetate, green leaf alcohol called “green fragrance”, and flavor components containing green leaf aldehyde.

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

  The aerosol for controlling mosquitoes of the present invention is adjusted so that the volume ratio (a / b) of the aerosol stock solution (a) and the propellant (b) is 10/90 to 50/50. By adjusting to such a range, the injection particles can be optimally formed from the injection port connected to the metering injection valve provided in the pressure vessel. Then, the ejected particles once ejected can quickly move to and adhere to the exposed portion in the processing space. On the other hand, of the spray particles, the spray particles that have not adhered to the exposed portion drift in the processing space, but are present in an amount that does not affect the human body or pet. Thus, the spray particles are present in an optimal state in the processing space, and can exert the pest control effect to the maximum. When the ratio of the propellant (b) is increased with respect to the volume ratio (a / b) of 10/90, that is, when a large amount of the propellant is sealed in the pressure-resistant container, it is formed from the injected aerosol stock solution. Since the spray particles are made finer than necessary, the amount of spray particles adhering to the exposed portion in the processing space is reduced. Thereby, the mosquitoes that have stopped on the exposed portion may not be reliably controlled. On the other hand, when the ratio of the propellant (b) is reduced with respect to the volume ratio (a / b) of 50/50, that is, when the amount of the propellant to be sealed in the pressure vessel is reduced, the above-mentioned aerosol stock solution is injected. Therefore, it is difficult to form the spray particles in the optimum range of the spray particles, so that the spray particles sprayed immediately. Therefore, the amount of ejected particles becomes insufficient, and it becomes difficult to knock down or kill mosquitoes at an early stage.

<Mosquito control aerosol>
As described above, a pest control component, an organic solvent, a propellant, and other components to be blended as necessary are selected, and these are enclosed in a pressure resistant container, thereby completing an aerosol product. This aerosol product is an aerosol for controlling mosquitoes according to the present invention, and sprays an aerosol stock solution as spray particles into a treatment space. The aerosol stock solution is mainly composed of pest control components and organic solvents, and strictly speaking, it is different from the propellant, but the aerosol stock solution is released to the outside of the pressure vessel at the same time as the propellant. Therefore, in the following description, the aerosol content including the aerosol stock solution and the propellant may be handled as the “aerosol stock solution”. Here, the injection valve provided in the aerosol for mosquito control according to the present invention will be described. The aerosol for controlling mosquitoes according to the present invention is mainly composed of a pressure-resistant container (aerosol container), a quantitative injection valve, and an injection button. The fixed injection valve is connected to an injection button, which is an operating part for injecting the aerosol solution, and the injection button is provided with an injection port through which the aerosol solution is injected from the aerosol container to the outside (processing space). is there.

  When the spray button for the mosquito control aerosol is pushed down once, the fixed injection valve is operated by the pressure of the propellant, and the aerosol stock solution in the pressure vessel rises to the injection port and is injected into the processing space. The injection volume of the aerosol stock solution at this time is adjusted to 0.1 to 0.4 mL, more preferably 0.1 to 0.2 mL. If it is such a range, the injection | pouring particle | grains formed from the injected aerosol stock solution can exhibit the optimal control effect in process space. When the spray volume is less than 0.1 mL, the spray volume is too small and the amount of spray particles moving to the exposed portion in the processing space is small, so that the amount of spray particles adhering to the exposed portion becomes insufficient, and the exposed portion It becomes difficult to knock down or kill dead mosquitoes. In addition, since the total amount of spray particles is small, the amount of spray particles floating in the processing space is also small, and it is difficult to knock down or kill mosquitoes flying in the processing space. On the other hand, when the amount exceeds 0.4 mL, an unnecessarily large amount of aerosol stock solution is released as spray particles in the processing space, so that the pest control component is filled in the processing space. For this reason, it becomes difficult for people and pets to enter the processing space. Moreover, since the usage-amount of aerosol stock solution becomes excessive, it is economically disadvantageous.

Moreover, as above-mentioned, although the injection quantity of a pest control component is adjusted to 5.0-30 mg per 4.5-8 tatami, Preferably, it is adjusted to 6.1-24 mg. Incidentally, a 4.5-8 tatami room corresponds to a space of about 18.5-33.0 m ³ . If it is such a range, a pest control effect will be exhibited appropriately and the mosquitoes in processing space can be knocked down or killed reliably. When the spray amount of the pest control component is less than 5.0 mg, the amount of spray particles adhering to the exposed portion in the processing space becomes small, so the effect of the pest control component is inferior and the mosquitoes that are stopped at the exposed portion are knocked down Or it becomes difficult to kill. On the other hand, when the spray amount of the pest control component exceeds 30 mg, an excessive amount of the pest control component is released into the processing space, so that the pest control component is filled in the processing space. For this reason, it becomes difficult for people and pets to enter the processing space. Moreover, since the usage-amount of a pest control component becomes excessive, it is economically disadvantageous.

  The aerosol for controlling mosquitoes of the present invention is adjusted so that the jetting force is 0.3 to 10.0 g · f at 25 ° C. at a distance of 20 cm from the jetting port. If it is such a range, the injection | spray particle injected from an injection port by one injection can be made to reach | attain the exposed part in processing space rapidly, and the effect of a pest control component can be exhibited. Further, the nozzle diameter of the nozzle is preferably set to 0.2 to 1.0 mm. If it is within this range, it can be appropriately adjusted to the above particle diameter and injection force, the injection particles are optimally formed from the aerosol stock solution injected into the treatment space, and can exert a pest control effect, It is possible to reliably knock down or kill mosquitoes in the treatment space.

FIG. 1 is a model diagram showing the behavior of spray particles formed from an aerosol stock solution when the aerosol stock solution is jetted into a processing space. FIG. 1A is a model diagram in the case of spraying a mosquito control aerosol according to a conventional product into a processing space, and FIG. 1B is a jet of the mosquito control aerosol according to the present invention into the processing space. FIG.
As shown in FIG. 1 (a), a conventional mosquito control aerosol product (simply referred to as “conventional product”) becomes particles M having a particle diameter of less than 10 μm when the aerosol stock solution is injected into the treatment space. Diffuses into the processing space. After a while, the particles M are further diffused throughout the processing space, and the pest control component is distributed throughout the processing space. Thereby, mosquitoes flying in the processing space can be knocked down or killed. However, as described above, mosquitoes stay at the exposed part in the processing space for a longer time than the flying time. Cannot be knocked down or killed reliably. In addition, when wind is blown by opening a window of the processing space, a part of the particles M floating in the processing space is washed away by the wind, and the effect of the pest control component is greatly reduced. Further, if the time during which the particles M are floating in the processing space is long, the amount of the particles M inhaled by the person or pet in the processing space increases, which may adversely affect the human body or pet.
Accordingly, the present inventors have developed a novel mosquito control aerosol product that solves these problems. Hereinafter, characteristic spray particles in the aerosol product for controlling mosquitoes according to the present invention will be described.

[Injected particles]
As shown in FIG. 1B, when the aerosol stock solution is jetted once into the processing space, jetted particles R are formed from the aerosol stock solution. The ejected ejected particles R quickly move and adhere to the exposed portion in the processing space. Here, the spray particles R in the state of being attached to the exposed portion of the spray particles R are defined as particles X (indicated by white circles in FIG. 1B. Hereinafter, the particles X are “exposure of the spray particles R”. Meaning spray particles R attached to the part). On the other hand, the ejected particles R that are not attached to the exposed portion and are floating in the processing space are defined as particles Y (indicated by black circles in FIG. 1B). ”Means spray particles R which do not adhere to the exposed portion and drift in the processing space. A preferable particle diameter for the spray particles R to move and adhere to the exposed portion (that is, exist as the particles X) is 90 to 80 μm at a volume integrated distribution at 25 ° C. and a spray distance of 15 cm. . If it is such a range, the injection | spray particle R injected into the process space will certainly move and adhere to the exposed part in a process space, and will become the particle | grain X, as FIG.1 (b) shows. As a result, it is possible to knock down or kill the mosquitoes that remain in the exposed portion by the pest control component of the spray particles. Moreover, since the insect pest control effect is exerted also on the mosquitoes entering the processing space and trying to stop at the exposed portion, it is possible to drive out the processing space. When the particle diameter of the ejected particles R is less than 10 μm, the amount of the ejected particles R that reach the exposed portion due to the particle diameter being too small is reduced. For this reason, it becomes difficult to control the mosquitoes that are stopped on the exposed part or about to stop. On the other hand, if the particle diameter exceeds 80 μm, it is difficult to control the behavior of the ejected particles R because the particle diameter is too large, and it is difficult to appropriately attach to the exposed portion. A more preferable particle diameter of the injection particles R is 90% particle diameter of 25 to 70 μm in a volume integrated distribution at 25 ° C. and an injection distance of 15 cm.
In FIG. 1B, for convenience of explanation, the particle X is shown as a white circle and the particle Y is shown as a black circle in order to distinguish the particle X from the particle Y. It is a particle derived from R.

Also preferred deposition amount of the injection particles R to the exposed portion of the processing space are the exposed portions 1 m ² per 0.01～0.4Mg, it is preferably, 1 m ² per 0.05~0.2mg . If it is such a range, the mosquito which has stopped in the exposed part can be knocked down or killed effectively. When the amount of adhesion is less than 0.01 mg per 1 m ² , it is not possible to exert a sufficient control effect on mosquitoes that remain on the exposed portion, and it becomes difficult to knock down or kill the mosquitoes. On the other hand, even if the adhesion amount exceeds 0.4 mg per m ² , the pest control effect is not greatly improved, and the amount of the aerosol stock solution used is excessive, which is economically disadvantageous.

Note that the particles Y can also exert a pest control effect on mosquitoes, as with the particles X described above. The particles Y cannot knock down or kill mosquitoes that are stopped in the exposed portion, but can effectively knock down or kill mosquitoes flying in the treatment space. In addition, since it is effective against mosquitoes trying to enter the processing space, it is also possible to suppress intrusion into the processing space.
In this way, the ejected particles R injected into the processing space exist in the state of particles X or particles Y, and each state is utilized to effectively knock down or kill mosquitoes in the processing space. Can do.

  As described above, immediately after spraying the aerosol stock solution once into the processing space, the sprayed particles R quickly move to the exposed portion in the processing space, and the adhered particles X and the attached portion are not attached to the exposed portion. It becomes a particle Y in a state of floating in space. Even after a lapse of a while after being sprayed once, the particles X remain attached to the exposed portion, and the mosquitoes remaining on the exposed portion can be knocked down or killed by the pest control component. On the other hand, the particles Y are spread evenly throughout the processing space, and the pest control component is gradually volatilized, so that mosquitoes flying in the processing space can be knocked down or killed. In addition, it is possible to prevent mosquitoes entering the processing space from entering. Even if the mosquitoes stop in the exposed part of the processing space or approach the vicinity of the exposed part even if it has entered the processing space, the pest of the particles X adhering to the exposed part The control component can reliably knock down or kill. As described above, the aerosol for controlling mosquitoes according to the present invention has the spray particles R sprayed from the spray port in an optimal state (the state of the particles X and the particles Y), and exhibits the pest control effect to the maximum. be able to. For this reason, it can be said that it is a useful product capable of exhibiting an excellent control effect on both mosquitoes present in the treatment space and mosquitoes entering the treatment space.

  In addition, when wind blows into the processing space, there are particles X adhering to the exposed portion even if some of the particles Y are swept away by the wind. As described above, since most of the mosquitoes present in the treatment space stay in the exposed portion for a longer time, if the particle X can exert a desired effect, the amount of the particle Y decreases. There is no worry that the control effect on mosquitoes is inferior. Furthermore, the aerosol for mosquito control according to the present invention does not diffuse almost all of the sprayed aerosol stock solution into the processing space as in the conventional product. The concentration of the pest control component diffusing in the treatment space (that is, the pest control component by the particles Y) is reduced by the amount of the particles X. Accordingly, the concentration of the treatment space is lower than that of the conventional product, and the influence on the human body and pets due to the inhalation of the pest control component is reduced, and the product can be provided as a safe product.

In addition, when the aerosol stock solution is sprayed once into the treatment space by the mosquito control aerosol of the present invention, the effect time of the pest control component is 20 hours or more in a space of 33 m ³ or less. As described above, the space of 33 m ³ or less includes a 4.5-8 tatami living room (ceiling height 2.5 m). Therefore, with the mosquito control aerosol according to the present invention, the pest control effect can be maintained substantially all day long in a normal living space such as a general house. Mosquitoes invade indoors day and night, and it is particularly necessary to prevent blood sucking during sleep. With the mosquito control aerosol according to the present invention, the effect of the pest control component lasts for 20 hours or more. For example, if sprayed once before going to bed at night, the effect will continue until the afternoon of the following day. And you can go to bed with peace of mind.

<Mosquito control method>
The mosquito control method of the present invention is carried out using the above mosquito control aerosol. First, an aerosol stock solution containing a pest control component and a higher fatty acid ester used as an organic solvent, and a pressure-resistant container provided with a quantitative injection valve enclosing a propellant, an injection port connected to the quantitative injection valve is When the provided injection button is pressed once, the aerosol stock solution is injected from the injection port into the processing space as the injection particles R (injection process). At this time, as shown in FIG. 1 (b), the ejected particles R quickly move to the exposed portion in the processing space, and are attached to the particles X and the exposed portion in the processing space without adhering to the exposed portion. Becomes a particle Y in a state of floating. Of the ejected particles R, the particles X are used to knock down or kill mosquitoes that have stopped on the surface of walls, floors, structures, etc. in the processing space, or against mosquitoes that want to stop at these locations. Also has an effect and drives it out of the processing space. On the other hand, the particles Y among the ejected particles R can knock down or kill mosquitoes flying in the treatment space, and also have an effect on mosquitoes trying to enter the treatment space. Suppresses entry into the space. The pest control effect of the spray particles R as described above lasts for a long time of 20 hours or more in a space of 33 m ³ or less. After the predetermined time has elapsed, the aerosol stock solution may be sprayed again into the treatment space, and thus mosquitoes can be knocked down or killed continuously.

As described above, the aerosol for controlling mosquitoes according to the present invention has a duration of the pest control component of 20 hours or more in a space of 33 m ³ or less, which is approximately one day. For this reason, if it is a mosquito control method performed using this mosquito control aerosol, the operation can be completed only by executing an injection step of injecting once a day at a predetermined time every day. In this way, anyone can easily inject the aerosol stock solution into the processing space, and can prevent missing of the injection timing.

  In order to confirm the mosquito control effect of the mosquito control aerosol of the present invention, a plurality of mosquito control aerosols (Examples 1 to 8) having the characteristic configuration of the present invention are prepared, and the mosquito control effect confirmation The test was conducted. In addition, for comparison, mosquito control aerosols (Comparative Examples 1 to 6) that do not have the characteristic configuration of the present invention are prepared, and for reference, mosquito control using profluthrin that is not the pest control component of the present invention. Aerosol (Reference Example 1) was prepared, and a similar mosquito control effect confirmation test was conducted. In addition, regarding the pest control component injection amount in Table 1, only Reference Example 1 is described as the injection amount of profluthrin.

As shown in Table 1 as Examples 1 to 8, aerosols for controlling mosquitoes were prepared according to the examples of the composition and conditions, and the tests shown below were performed. For Comparative Examples 1 to 6 and Reference Example 1, mosquito control aerosols were prepared under the compositions and conditions shown in Table 1, and the same tests as in Examples were performed. The test results are shown in Table 2.
(1) an aerosol for mosquitoes control injected once obliquely upward in the center of the room of 25 m ³ was completely closed control effect against adult mosquitoes were the immediately emit Fifty Culex females, exposed 2 hours Later, all test mosquitoes were collected. In the meantime, female mosquitoes that fell and turned over time were counted, and a KT ₅₀ value (min) was determined. In the same room, the same operation was performed 10 hours, 14 hours, and 20 hours after spraying the mosquito control aerosol once.
(2) Residual rate of spray particles in air The mosquito control aerosol was sprayed once in an obliquely upward direction toward the center of a closed 25 m ³ room. Air collection tube (glass tube filled with silica gel and both ends packed with absorbent cotton) at a position 50 cm behind the center of the room (130 cm from the wall) and 120 cm above the floor, and connected to a vacuum pump for injection treatment 2 hours later, a predetermined amount of air was sucked. The air collection tube was washed with acetone, and the amount of collected insect pest control components was analyzed by gas chromatography (manufactured by Shimadzu Corporation, model GC1700). Based on the obtained analysis value, the air concentration of the pest control component was calculated, and the ratio to the theoretical air concentration was determined as the air residual ratio.

From the results shown in Tables 1 and 2, in all of the examples, the KT ₅₀ value was maintained at a significant value even after 20 hours of spraying the mosquito control aerosol once, and excellent mosquito control was achieved. It turns out that an effect is shown. Moreover, as an organic solvent combined with a pest control component, a higher fatty acid ester having a total carbon number of 13 to 20 is effective, but a higher fatty acid ester having a total carbon number of 16 to 20 is more effective. I understood. On the other hand, in Comparative Examples 1 to 6, the KT ₅₀ value was inferior to that of the Example at the time 10 hours after spraying the mosquito control aerosol once, and after 14 hours, Inferior results were shown. And after 20 hours, it was shown that the control effect with respect to the adult Culex mosquito was almost extinguished after 20 hours. Moreover, it turned out that the reference example 1 which uses profluthrin for a pest control component is also inferior to the mosquito control effect from Examples 1-8 which use metfurthrin and / or transfluthrin.

Next, a test for confirming the mosquito control effect was performed on the mosquito control aerosol of the present invention targeting mosquitoes different from Examples 1-8. This test is referred to as Example 9.
In Example 9, an insect stock solution of 36.0% by weight of metfurthrin was prepared by dissolving metfluthrin as a pest control component in isopropyl palmitate as an organic solvent. 4.0 mL of this aerosol stock solution and 16.0 mL of liquefied petroleum gas as a propellant were pressure-filled into an aerosol container with a quantitative injection valve to obtain an aerosol for controlling mosquitoes of the present invention. The volume ratio (a / b) between the aerosol stock solution (a) and the propellant (b) was adjusted to 20/80. Then, 0.1 mL of the aerosol stock solution was sprayed slightly obliquely upward in a 6 tatami room (about 25 m ³ ) having a ceiling height of 2.5 m in which the above-mentioned mosquito control aerosol was substantially sealed. At this time, the spray amount of the pest control component (methfluthrin) was 7.2 mg. Moreover, the spraying power (25 degreeC) in the spraying distance 20cm of the aerosol for mosquito control was 1.4 g.f. The 90% particle size in a volume integrated distribution at 25 ° C. and a spray distance of 15 cm of the spray particles formed from the aerosol stock solution was 42 μm.

  Immediately after spraying the aerosol for controlling mosquitoes of Example 9, chironomids were released into this room, and the chironomis were immediately knocked down or killed. Moreover, it was 0.93% when the residual ratio in the air of the insect pest control component (metofluthrin) was determined in the same manner as in Examples 1 to 8.

From the test results of Examples 1 to 9, according to the mosquito control aerosol of the present invention and the mosquito control method using the same, it exceeds 20 hours in a space of at least 25 m ³ (equivalent to about 6 tatami mats). It has been revealed that it has an excellent control effect against mosquitoes over a long period of time. In addition, it was confirmed that the aerosol for controlling mosquitoes of the present invention exhibits a mosquito control effect of 20 hours or more even when the space volume of the processing target is expanded to 33 m ³ (equivalent to about 8 tatami mats). In addition, when a similar insecticidal effect confirmation test was conducted on flying insects other than mosquitoes, the insects showed a controlling effect for 4 hours or more in a space of 33 m ³ or less, and are very practical. It has been found. In addition, a secondary effect of preventing insects such as cockroaches, ants, and hornworms from coming close was confirmed.

  ADVANTAGE OF THE INVENTION According to this invention, the mosquito control aerosol which has a high control effect with respect to mosquitoes, and the mosquito control method using the same can be provided.

R Injected particles X Injected particles adhering to the exposed part Y Injected particles floating in the processing space

Claims (8)

There is provided an aerosol stock solution containing metofluthrin and / or transfluthrin as a pest control component and a higher fatty acid ester having a total number of carbon atoms of 16 to 20 as an organic solvent, and a quantitative injection valve encapsulating a propellant. A pressure vessel,
An injection button provided with an injection port connected to the quantitative injection valve;
An aerosol for controlling mosquitoes comprising:
The volume ratio (a / b) of the aerosol stock solution (a) and the propellant (b) is 10/90 to 50/50,
The injection volume when the injection button is pressed once is 0.1 to 0.4 mL,
The particle diameter of the spray particles sprayed from the spray nozzle is 10 to 80 μm with a 90% particle diameter in a volume integrated distribution at 25 ° C. and a spray distance of 15 cm.
When the aerosol stock solution is sprayed once in the treatment space, the residual rate in the air after 2 hours of the pest control component is 0.05 to 5%, and the effect duration of the pest control component is 33 m ³ or less. An aerosol for controlling mosquitoes that is 20 hours or more with respect to the space.   2. The mosquito control aerosol according to claim 1, wherein the particle diameter of the spray particles sprayed from the spray nozzle is 25 to 70 μm with a 90% particle diameter in a volume integrated distribution at 25 ° C. and a spray distance of 15 cm.   The aerosol for mosquito control according to claim 1 or 2, wherein a spray volume when the spray button is pressed once is 0.1 to 0.2 mL.   The aerosol for mosquito control according to any one of claims 1 to 3, wherein an injection amount of the pest control component when the spray button is pressed once is 5.0 to 30 mg per 4.5 to 8 tatami. .   The mosquito control according to any one of claims 1 to 4, wherein the higher fatty acid ester is at least one selected from the group consisting of isopropyl myristate, butyl myristate, hexyl laurate, and isopropyl palmitate. For aerosol.   The mosquito control aerosol according to claim 5, wherein the higher fatty acid ester is isopropyl myristate.   A method for controlling mosquitoes, wherein the aerosol stock solution is jetted into a treatment space using the aerosol for controlling mosquitoes according to any one of claims 1 to 6 to knockdown or kill the mosquitoes.   The method for controlling mosquitoes according to claim 7, wherein the spraying of the aerosol stock solution into the processing space is performed once every 24 hours.

Images