JP7568448B2 - Pest control method and aerosol product - Google Patents

Description

The present invention relates to a pest control method and an aerosol product, and more specifically to a pest control method that is effective in preventing the intrusion of pests into buildings, and an aerosol product for use in said method.

Traditionally, the presence of pests within buildings such as detached houses, apartment complexes, and food and pharmaceutical manufacturing plants has been unwelcome, and extermination measures such as killing or trapping pests that have invaded buildings have been implemented. For example, methods such as using aerosol pest control products to directly spray chemicals containing insecticides onto pests, and having pests ingest poison bait containing insecticides, are known. Of these, aerosol products are widely used because they are easy to target pests from a distance and are easy to dispose of.

Various aerosol products for exterminating pests have been proposed. For example, an aerosol insecticide has been proposed in which a liquid containing an insecticidal active ingredient, its solvent, and a propellant is sealed in a container with a valve, and the liquid can be released in an aerosol state from the valve by the pressure of the propellant, with the liquid having a viscosity (20°C) of 0.002 to 0.004 Pas and a specific gravity (20°C) of 0.76 to 0.80 (see Patent Document 1).

For odorous pests such as stink bugs, it is desirable to prevent them from entering buildings to prevent damage caused by the pests. As a method for this, for example, a method of controlling stink bugs has been proposed in which a liquid or aerosol residential stink bug control agent containing (4-ethoxyphenyl) [3- (3-phenoxy-4-fluorophenyl) propyl] (dimethyl) silane and a pyrethroid insecticide is applied to window frames, doors, etc. of a house to prevent stink bugs from entering the house (see Patent Document 2).

JP 2008-156235 A Japanese Patent Application Publication No. 8-59413

However, in the method described in Patent Document 2, an aerosol product is applied to window frames, doors, etc. to prevent pests from entering buildings. However, window frames and doors that face the outdoors are often made of materials such as aluminum or polyvinyl chloride resin, and when sprayed onto such metal or resin building materials, the aerosol contents can drip onto the attachment surface. If the aerosol contents drip onto a window frame or door, pests may enter the building through areas where the aerosol contents (especially the active ingredient) are not attached, resulting in insufficient effectiveness in preventing pest intrusion and a problem of dirty appearance.

The present invention was made in consideration of the above problems, and aims to provide a pest control method that can spray an aerosol product for pest control onto a metal or resin target object, and that can apply the aerosol contents evenly without dripping, and that is sufficiently effective in preventing the intrusion of pests, as well as an aerosol product for use in said method.

As a result of extensive research, the inventors discovered that the above problems could be solved by spraying the aerosol contents onto a metal or resin target object in a manner that would cause the particles to adhere to the target object in a specific range of diameters, and thus arrived at the present invention.

That is, the present invention is characterized by the following (1) to (4).
(1) A pest control method, comprising spraying a metal or resin target object with an aerosol product prepared by filling a pressure-resistant container with an aerosol composition containing a concentrate containing an active ingredient and a propellant so that the average particle diameter (D50) of the spray particles is in the range of 4 to 50 μm.
(2) The pest control method according to (1) above, wherein the target object is a building component that separates the indoor area from the outdoor area.
(3) An aerosol product for pest control that is sprayed on a metal or resin target, the aerosol product being characterized in that an aerosol composition containing a concentrate containing an active ingredient and a propellant is filled into a pressure-resistant container, and the average particle diameter (D50) of the sprayed particles at a distance of 25 cm from the nozzle of the aerosol product is in the range of 4 to 50 μm.
(4) An aerosol product as described in (3) above, characterized in that it is provided with a particle diameter switching mechanism capable of switching the average particle diameter of the spray particles, and is capable of switching between spray pattern A in which the average particle diameter (D50) of the spray particles at a distance of 25 cm from the nozzle of the aerosol product is in the range of 4 to 50 μm, and spray pattern B in which the average particle diameter (D50) of the spray particles at a distance of 50 cm from the nozzle of the aerosol product is in the range of 30 to 120 μm.

According to the pest control method of the present invention, the contents of the pest control aerosol product can be applied uniformly to a metal or resin object without dripping, so pests approaching the object can be effectively controlled and the object's appearance is not soiled. Therefore, by applying the aerosol product to window frames, doors, etc. of a building, it is possible to prevent pests from entering the building.

FIG. 1 is a diagram for explaining the test method for the pest intrusion prevention test, in which (a) is a plan view of the test area from above, and (b) is a perspective view of the test area as viewed from the direction of arrow A in (a).

Hereinafter, the embodiments of the present invention will be described in further detail.
The pest control method of the present invention comprises spraying a metal or resin target with an aerosol product obtained by filling a pressure-resistant container with an aerosol composition containing a concentrate containing an active ingredient and a propellant so that the average particle diameter (D50) of the sprayed particles is in the range of 4 to 50 μm. The method of the present invention provides a method that can effectively exert the effect of an active ingredient when the active ingredient is attached to a metal or resin target to prevent the intrusion of pests into a building.

The object to be treated is preferably a building component that separates the indoors from the outdoors, and specific examples include window frames, entrance doors, etc. By treating a building component such as a window frame or entrance door with an aerosol product for pest control using the pest control method of the present invention, the aerosol composition can be applied evenly to the target surface without dripping, even if the target is made of metal or resin, and therefore it is possible to prevent pests from entering the building from the outdoors.

As mentioned above, the target object is made of metal or resin. The penetration of the liquid medicine into metal and resin surfaces is weaker than that into wood, etc., and when an aerosol product is sprayed, the spray particles tend to combine and form droplets. By spraying the spray particles so that the average particle size (D50) of the spray particles is in the range of 4 to 50 μm onto a metal or resin target object, it is possible to attach the spray particles to the surface of the target at a size that makes it difficult for them to combine, and it is presumed that the active ingredient can be attached uniformly to the target object. Furthermore, if the material of the window frame is wood, which has a high penetration power of the liquid medicine, the liquid medicine will seep into the material and will not easily remain on the surface. As a result, less liquid medicine adheres to the epidermis of the pest, making it difficult to effectively express the effects of the active ingredient.

Examples of metals constituting the object include aluminum, steel, stainless steel, copper, and alloys thereof, and examples of resins include polyvinyl chloride resin, and composite materials of these may also be used. In addition, the surface of the object may be made of metal or resin, and the object may be a laminate in which the surface of a material other than metal or resin, such as wood or paper, is covered with metal or resin.

(Aerosol products)
The aerosol product used in the pest control method of the present invention is prepared by filling an aerosol composition containing a concentrate containing an active ingredient and a propellant into a pressure-resistant container.

(undiluted solution)
The concentrate constituting the aerosol composition contains at least a drug as an active ingredient. The active ingredient is a component that can repel, knock down, kill, etc., target pests, and the type of active ingredient is not particularly limited, and any known compound can be used.

Active ingredients include, for example, pyrethroid compounds such as permethrin, pyrethrins, allethrin, phthalthrin, resmethrin, furamethrin, fenothrin, empenthrin, prallethrin, cyfluthrin, cyphenothrin, imiprothrin, transfluthrin, and metofluthrin; organophosphorus compounds such as fenitrothion, dichlorvos, chlorpyrifos-methyl, diazinon, and fenthion; carbaryl, propoxur, etc. carbamate compounds such as methoprene, pyriproxyfen, methoxadiazone, fipronil, amidoflumet, and other compounds; peppermint oil, orange oil, fennel oil, cinnamon oil, clove oil, turpentine oil, eucalyptus oil, Japanese cypress oil, jasmine oil, neroli oil, peppermint oil, bergamot oil, butygrain oil, lemon oil, lemongrass oil, cinnamon oil, citronella oil, geranium oil, citral, l-menthol, citronellol acetate Various essential oil components such as methyl ether, cinnamic aldehyde, terpineol, nonyl alcohol, cis-jasmone, limonene, linalool, 1,8-cineole, geraniol, α-pinene, p-menthane-3,8-diol, eugenol, menthyl acetate, thymol, benzyl benzoate, and benzyl salicylate; glycol ethers such as propylene glycol monopropyl ether, propylene glycol monobutyl ether, dipropylene glycol monopropyl ether, dipropylene glycol monobutyl ether, dipropylene glycol dimethyl ether, ethylene glycol monoisobutyl ether, diethylene glycol monoisobutyl ether, diethylene glycol dibutyl ether, diethylene glycol dimethyl ether, and triethylene glycol dimethyl ether; and dibasic acid esters such as dibutyl adipate. These may be used alone or in combination of two or more.

The active ingredient may be appropriately selected according to the type of target pest, such as mosquitoes, flies, moths, bees, stink bugs, cockroaches, ants, spiders, pillbugs, mites, lice, centipedes, caterpillars, millipedes, spiders, horseflies, blackflies, moths, termites, midges, leafhoppers, wood beetles, ground beetles, earwigs, silverfish, longhorn beetles, dermestid beetles, booklice, burrs, and rice moths.
For crawling pests such as cockroaches, stink bugs, ants, spiders, pillbugs, mites, lice, centipedes, caterpillars, millipedes, spiders, termites, wood beetles, ground beetles, earwigs, silverfish, etc., cyfluthrin, cyphenothrin, fenpropathrin, phthalthrin, prallethrin, imiprothrin, permethrin, fenothrin, etc. are suitable. In particular, when used to prevent crawling pests from entering indoors, cyfluthrin, fenpropathrin, and permethrin are preferred. For flying pests such as mosquitoes, flies, moths, bees, horseflies, blackflies, midges, leafhoppers, moths, and rice moths, transfluthrin, metofluthrin, profluthrin, phthalthrin, prallethrin, momfluorothrin, etc. are suitable.

The content of the active ingredient in the concentrate is preferably 0.1 to 5 mass/volume%. When the active ingredient is at least 0.1 mass/volume% in the concentrate, sufficient drug effects can be obtained, and when it is at most 5 mass/volume%, productivity is improved. The lower limit of the content of the active ingredient is more preferably 0.8 mass/volume% or more, even more preferably 2 mass/volume% or more, and the upper limit is more preferably 4 mass/volume% or less, even more preferably 3 mass/volume% or less.

It is preferable that the concentrate contains a solvent for the purposes of dissolving the active ingredient, adjusting the viscosity of the concentrate, improving production suitability, increasing the penetration of the active ingredient into pests, etc. Examples of the solvent include water and organic solvents.

Examples of water include tap water, purified water, ion-exchanged water, etc.

Examples of the organic solvent include the above-mentioned glycol ethers, hydrocarbon solvents, alcohol solvents, aromatic solvents, and ester solvents.
Examples of the hydrocarbon solvent include aliphatic hydrocarbons such as paraffinic hydrocarbons and naphthenic hydrocarbons, and kerosene such as JIS No. 1 kerosene is preferred. Specific examples include normal paraffin and isoparaffin. Typical normal paraffins have a carbon number of 8 to 16, such as Neo Thiosol manufactured by Chuo Kasei Co., Ltd. and Normal Paraffin MA manufactured by JXTG Nippon Oil & Energy Corporation. Typical isoparaffins have a carbon number of 8 to 16, such as IP Clean LX and Supersol FP25 manufactured by Idemitsu Kosan Co., Ltd.
Examples of the alcohol-based solvent include lower alcohols such as methanol, ethanol, and propanol, and polyhydric alcohols such as glycerin and ethylene glycol.
Examples of aromatic solvents include toluene and xylene.
Examples of ester-based solvents include isopropyl myristate, hexyl laurate, and isopropyl palmitate.
Among the solvents, hydrocarbon-based solvents and ester-based solvents are particularly preferred because they adhere well to the object when it is treated, with hydrocarbon-based solvents being particularly preferred.

The solvent may be used alone or in combination of two or more.

The solvent content in the concentrate is preferably 80 to 99.9% by mass/volume. Having the solvent in the concentrate at 80% by mass/volume or more can improve production suitability, and a content of 99.9% by mass/volume or less is preferable because it ensures sufficient drug effect. The solvent content is more preferably at a lower limit of 90% by mass/volume or more, even more preferably at a higher limit of 95% by mass/volume or more, and more preferably at an upper limit of 99% by mass/volume or less, even more preferably at a higher limit of 97% by mass/volume or less.

The concentrate may contain other ingredients as long as they do not impair the effects of the present invention. Examples of other ingredients include fragrances, deodorants, disinfectants, preservatives, pH adjusters, UV absorbers, inorganic substances, surfactants, etc.

Examples of fragrances include the essential oil components mentioned above, natural fragrances such as anise oil, bergamot oil, lavender oil, rose oil, rosemary oil, and grapefruit oil, and synthetic fragrances such as camphene, p-cymene, citronellol, nerol, benzyl alcohol, n-butyraldehyde, isobutyraldehyde, coumarin, cineole, linalool, limonene, and l-menthol.

Examples of deodorants include components that adsorb odorous components, such as green tea extract, persimmon tannin, lauric acid methacrylate, methyl benzoate, methyl phenylacetate, geranyl crotolate, acetophenone myristate, benzyl acetate, benzyl propionate, and silver, as well as components that mask odorous components, such as the aromatic components mentioned above.

Examples of disinfectants and germicides include ethanol, hinokitiol, 2-mercaptobenzothiazole, 2-(4-thiazolyl)benzimidazole, 5-chloro-2-methyl-4-isothiazolin-3-one, triforine, 3-methyl-4-isopropylphenol, ortho-phenylphenol, chlorhexidine gluconate, polylysine, chitosan, tetrahydrolinalool, and dialkyldimethylammonium chloride.

Preservatives include, for example, methylparaben, ethylparaben, sodium benzoate, etc.

Examples of pH adjusters include citric acid, sodium monohydrogen phosphate (Na ₂ HPO ₄ ), sodium dihydrogen phosphate (NaH ₂ PO ₄ ), potassium dihydrogen phosphate (KH ₂ PO ₄ ), and potassium monohydrogen phosphate (K ₂ HPO ₄ ).

Examples of ultraviolet absorbers include benzoic acid-based ultraviolet absorbers such as para-aminobenzoic acid (hereinafter referred to as PABA), glyceryl PABA, ethyl dihydroxypropyl PABA, N-ethoxylate PABA ethyl ether, N-dimethyl-PABA butyl ether, N-dimethyl-PABA amyl ether, and octyl dimethyl PABA; anthranilic acid-based ultraviolet absorbers such as homomenthyl-N-acetylanthranilate; and salicylic acid-based ultraviolet absorbers such as amyl salicylate, mesityl salicylate, octyl salicylate, phenyl salicylate, benzyl salicylate, and p-isopropanol phenyl salicylate.

Examples of inorganic substances include silica, alumina, and aluminosilicates.

Examples of surfactants include sorbitan monooleate, sorbitan monostearate, sorbitan monolaurate, sorbitan trioleate, polyoxyethylene monooleate, polyoxyethylene nonylphenyl ether, polyoxyethylene hydrogenated castor oil, tripolyoxyethylene alkyl ether, 1,3-butylene glycol, decaglycerin monooleate, diglycerin monooleate, propylene glycol dioleate, polyoxyethylene stearyl acid amide, polyoxyethylene polyoxypropylene glycol, sorbitan sesquioleate, polyoxyethylene (2) lauryl ether, diglyceryl monooleate, hexaglycerin polyricinoleate, octyldodecyl ether of lauroyl glutamate, stearyl alcohol, lanolin fatty acid, polyvinylpyrrolidone, etc.

The concentrate is obtained by mixing and dissolving or dispersing each component.

The content of the concentrate in the aerosol composition can be appropriately changed taking into consideration the combination with the propellant and the average particle size of the sprayed particles, and is not particularly limited, but can be, for example, 1 to 30% by volume in the aerosol composition. If the concentrate is 1% by volume or more in the aerosol composition, a sufficient drug effect can be obtained, and if it is 30% by volume or less, the concentrate can be sprayed as spray particles. The content of the concentrate in the aerosol composition is preferably 2% by volume or more at the lower limit, and more preferably 5% by volume or more. Note that the lower the content of the concentrate, the greater the amount of propellant mixed in, so the cooling effect when sprayed is enhanced, and this cooling effect makes it easier to control pests. In addition, since the sprayed aerosol composition is prone to drying, the upper limit is more preferably 20% by volume or less, and even more preferably 15% by volume or less.

In order to achieve the effects of the present invention, it is preferable that the aerosol composition contains the active ingredient in the range of 0.001 to 2 mass/volume %. This range allows the active ingredient to adhere to the treated surface in an amount effective for repelling pests when sprayed at an appropriate spray rate. The content of the active ingredient in the aerosol composition is more preferably 0.005 to 1 mass/volume %, and even more preferably 0.01 to 0.5 mass/volume %.

(Propellant)
The propellant is a medium for spraying the concentrate, and is filled under pressure together with the concentrate into a pressure-resistant container.
As the propellant, for example, one or more of liquefied gases such as liquefied petroleum gases (LPG) such as propane, propylene, n-butane, isobutane, etc., dimethyl ether (DME), etc., compressed gases such as carbon dioxide gas, nitrogen gas, compressed air, etc., and halogenated carbon gases such as HFC-152a, HFC-134a, HFO-1234yf, HFO-1234ze, etc. can be used. The propellant to be used may be appropriately selected depending on the compatibility with the concentrate and the container components such as an aerosol valve.

The content of the propellant in the aerosol composition can be appropriately changed according to the specifications of the aerosol product, such as the combination with the concentrate and the adjustment of the particle size of the sprayed particles, and is not particularly limited, but can be, for example, 70 to 99% by volume in the aerosol composition. When the propellant is 70% by volume or more in the aerosol composition, the concentrate can be sprayed as sprayed particles, so that the drug is more easily spread and dripping can be prevented. In addition, the cooling effect when sprayed is enhanced, and this cooling effect makes it easier to control pests. In addition, when the propellant is 99% by volume or less, a sufficient drug effect can be obtained. The content of the propellant in the aerosol composition is more preferably 80% by volume or more, more preferably 85% by volume or more, and more preferably 98% by volume or less, and even more preferably 95% by volume or less, in terms of making it easier to obtain a cooling effect and making the sprayed aerosol composition easier to dry.
In addition, if the propellant contains too much dimethyl ether, it tends to be highly corrosive to resins such as wax and rubber, etc., and is likely to affect components. Therefore, the content of dimethyl ether in the propellant is preferably 70% by volume or less, and more preferably 55% by volume or less.

The volume ratio of the concentrate to the propellant in the aerosol composition is preferably 1:99 to 30:70, and more preferably 5:95 to 15:85. By using such a volume ratio, the effect of the active ingredient can be fully obtained and the particle size of the spray particles can be adjusted.

The aerosol product of the present invention is constructed by filling a pressure-resistant container for aerosols with the above-mentioned concentrate and propellant, closing the opening of the pressure-resistant container with an aerosol valve, and attaching an ejection member to the aerosol valve.

(Aerosol valve)
The aerosol valve comprises an opening/closing member for switching between communication and cut-off between the inside and outside of the pressure-resistant container by the user operating the ejection member, a housing to which the opening/closing member is attached, and a mounting member for holding the housing at a predetermined position in the pressure-resistant container. The opening/closing member also includes a stem that slides up and down in conjunction with the ejection member. The sliding of the stem switches between communication (ejection state) and cut-off (non-ejection state) of the aerosol composition. The housing is formed with a housing hole for taking in the aerosol composition from the pressure-resistant container. The stem is formed with a stem hole for sending the aerosol composition taken in the housing to the ejection member. The path from the housing hole to the stem hole constitutes an internal passage through which the aerosol composition passes.

The shape of the stem hole in the stem of the aerosol valve may be circular or polygonal. From the viewpoint of setting the spray amount in the desired range, the size of the stem hole is preferably 0.05 to 4 ^mm2 in cross section, more preferably 0.1 to 2 ^mm2 .
The stem hole may be one or more. When there are multiple stem holes, the area of the stem hole is the total area of the multiple stem holes.

(Injection member)
The spray member (spray button) is a member attached to the pressure container via the aerosol valve. The spray button is formed with an internal passage in the operating part through which the aerosol composition taken in from the pressure container via the stem hole of the aerosol valve passes, and a nozzle through which the aerosol composition is sprayed.

The spray button may be configured to allow attachment of a particle size switching mechanism (e.g., a spray nozzle) described below, such as a recess or a screw portion for fitting the spray nozzle.

The shape of the nozzle of the spray button may be circular or polygonal. If the nozzle shape is polygonal, the size of the nozzle may be the same as if it were circular.

(Particle size switching mechanism)
The aerosol product of the present invention is preferably provided with a particle size switching mechanism capable of switching the average particle size of spray particles. The particle size switching mechanism is not particularly limited as long as it can switch the average particle size of spray particles, but for example, a spray nozzle is attached to the nozzle of the spray member, or a spray member equipped with a spray pattern switching mechanism is used. Among them, a removable spray nozzle is preferable because it can spray with two patterns of particle size depending on whether the spray nozzle is present or not, and the manufacturing cost is not likely to be high.

In the present invention, the particle size switching mechanism can change the area and inner diameter of the nozzle through which the aerosol composition is ejected, for example, by fitting or removing the spray nozzle into the nozzle of the spray member, thereby spraying spray particles having the desired average particle size.

By using a particle size switching mechanism, for example by fitting or removing a spray nozzle into or from the nozzle of the spray button, the area of the nozzle from which the aerosol composition is ejected can be set to preferably 0.07 to 5.0 ^mm2 , more preferably 0.12 to 3.2 ^mm2 , and even more preferably 0.19 to 1.8 ^mm2 , thereby enabling good spraying without dripping onto the spray surface.
Furthermore, when the nozzle from which the aerosol composition is ejected is circular, the inner diameter (nozzle hole diameter) of the nozzle of the spray button can be adjusted to preferably 0.3 to 2.5 mm, more preferably 0.4 to 2.0 mm, and even more preferably 0.5 to 1.5 mm by, for example, fitting or removing a spray nozzle into or from the nozzle using a particle diameter switching mechanism, thereby enabling good spraying without dripping onto the spray surface.

Furthermore, by using a particle size switching mechanism, for example by fitting or removing a spray nozzle into or from the nozzle of the spray button, the area of the nozzle from which the aerosol composition is ejected can be adjusted to preferably 0.19 to 16 mm ² , more preferably 0.78 to 9.7 mm ² , and even more preferably 1.7 to 7.1 mm ² , so that the aerosol composition can be sprayed directly on pests to cool them, thereby obtaining the desired insecticidal effect.
Furthermore, when the nozzle from which the aerosol composition is ejected is circular, the inner diameter (nozzle hole diameter) can be adjusted to preferably 0.5 to 4.5 mm, more preferably 1.0 to 3.5 mm, and even more preferably 1.5 to 3.0 mm by, for example, fitting or removing an ejection nozzle into or from the nozzle of the ejection button using a particle diameter switching mechanism, and the composition can be sprayed directly onto pests to cool them, thereby obtaining the desired insecticidal effect.

The ratio of the area of the nozzle of the spray button to the area of the stem hole (nozzle area/stem hole area) is more preferably 1 to 30. When the nozzle area/stem hole area is in this range, clogging of the aerosol composition can be suppressed while a good spray pattern can be formed.

The above-mentioned spray nozzle is a component that can make the spray pattern finer. For example, a spray nozzle with a long flow path in the longitudinal direction and a nozzle at the tip for adjusting the particle diameter can be used.

The length of the flow passage (tube) of the spray nozzle is preferably 50 to 200 mm, more preferably 100 to 150 mm, from the viewpoint of ease of handling. The diameter of the flow passage (inner diameter of the tube) of the spray nozzle is preferably φ0.3 to 3 mm, more preferably φ0.5 to 2 mm, so as not to hinder the ejection of the aerosol composition.
Regarding the diameter of the nozzle hole of the spray nozzle, from the viewpoint of setting the spray amount and particle diameter in the desired range, the area of the nozzle hole through which the aerosol composition is discharged is preferably 0.07 to 5.0 ^mm2 , more preferably 0.12 to 3.2 ^mm2 , and even more preferably 0.19 to 1.8 ^mm2 , and the inner diameter (hole diameter) is preferably 0.3 to 2.5 mm, more preferably 0.4 to 2.0 mm, and even more preferably 0.5 to 1.5 mm, when the nozzle hole through which the aerosol composition is discharged is circular. The shape of the nozzle hole of the spray nozzle may be circular or polygonal. When the nozzle hole of the spray nozzle is polygonal, the area of the nozzle hole may be the same as that of a circular nozzle. The nozzle hole of the spray nozzle may have one or more nozzle holes. When the nozzle hole of the spray nozzle has multiple nozzle holes, the area of the nozzle hole is the total area of the multiple nozzle holes.

The ratio of the area of the nozzle hole to the area of the stem hole (hole area/stem hole area) is more preferably 1 to 10. When the hole area/stem hole area is in this range, the particle size of the aerosol composition can be suitably adjusted, and a good spray pattern can be formed without noticeable dripping.

(Spray amount)
The amount of spray of the aerosol product of the present invention is preferably 5 to 100 g per 10 seconds, and more preferably 10 to 70 g per 10 seconds. When the amount of spray is within the above range, the active ingredient can be attached in an effective amount, and the effect of the active ingredient can be fully obtained.

(Spray particle diameter)
In addition, the aerosol product of the present invention preferably has an average particle size (D50) of the spray particles at a distance of 25 cm from the nozzle of the aerosol product (the position where the aerosol composition is ejected) in the range of 4 to 50 μm. If the average particle size (D50) of the spray particles at a distance of 25 cm from the nozzle of the aerosol product is 4 μm or more, the effect of the present invention due to the active ingredient can be fully obtained, and if it is 50 μm or less, there is no dripping even when sprayed on a metal or resin target. It is more preferable that the lower limit of the average particle size (D50) of the spray particles is 4.5 μm or more, and the upper limit is 47 μm or less.
The average particle diameter (D50) of the spray particles may be that obtained when a particle diameter switching mechanism is used, or that obtained when the spray particles are directly sprayed from the nozzle of the spray button without using the particle diameter switching mechanism.

Furthermore, when the aerosol product of the present invention is provided with the particle size switching mechanism, it is preferable that the aerosol product can be switched between spray pattern A, in which the average particle size (D50) of spray particles at a distance of 25 cm from the nozzle of the aerosol product (the ejection position of the aerosol composition) is in the range of 4 to 50 μm, and spray pattern B, in which the average particle size (D50) of spray particles at a distance of 50 cm from the ejection position is in the range of 30 to 120 μm.
When sprayed with spray pattern A, if the object to be treated is made of metal or resin, the aerosol contents can be attached to the treatment surface without dripping, and when sprayed with spray pattern B, the average particle diameter of the spray particles is large, so that the amount of active ingredient that adheres to the pest increases when sprayed directly on the pest, and a sufficient cooling effect can be obtained, and an excellent control effect can be exhibited. The average particle diameter (D50) of the spray particles of spray pattern A is more preferably 4.5 μm or more in lower limit and 47 μm or less in upper limit. The average particle diameter (D50) of the spray particles of spray pattern B is more preferably 35 μm or more in lower limit and 105 μm or less in upper limit.

When the particle size switching mechanism is used to adjust the particle size to prevent dripping when sprayed on a metallic or plastic object such as a window frame, spraying directly on pests weakens the effect of cooling the pests, making it difficult to achieve the desired insecticidal effect. On the other hand, when the particle size switching mechanism is used to adjust the particle size to obtain a cooling insecticidal effect by spraying directly on pests, dripping is likely to occur when sprayed on a metallic or plastic object such as a window frame. Therefore, it is preferable to use spray pattern A or spray pattern B depending on the target to be directly sprayed.

(Pest control method)
In the pest control method of the present invention, the aerosol product of the present invention is sprayed on a metal or resin target so that the average particle diameter (D50) of the spray particles is in the range of 4 to 50 μm. For example, if an aerosol product having an average particle diameter (D50) of 4 to 50 μm at a distance of 25 cm from the nozzle of the spray button of the aerosol product is used, spray particles having an average particle diameter of 4 to 50 μm can be attached to the surface of the target by spraying from a position about 25 cm away from the target, and the effect of the present invention can be obtained. In addition, if an aerosol product having an average particle diameter (D50) of spray particles larger than 50 μm at a distance of 25 cm away from the nozzle of the spray button is used, the particle diameter of the sprayed particles can be adjusted using the particle diameter switching mechanism so that spray particles having an average particle diameter of 4 to 50 μm are attached to the surface of the target.

In the present invention, when spraying an aerosol product onto an object, it is preferable to spray the aerosol composition so that the spray amount is 10 to 600 g/m ^2. The effect of the present invention can be sufficiently obtained by spraying the aerosol composition onto the treatment surface of the object in the range of 10 to 600 g/m ^2. The spray amount of the aerosol composition is more preferably 15 to 500 g/m ² .

The present invention will be further explained below with reference to examples and comparative examples, but the present invention is not limited to the following examples.

<Test Example 1>
1. Preparation of Stock Solution 1.0 g of cyfluthrin, 1.5 g of phthalthrin, and 10 g of isopropyl myristate were weighed into a 100 mL measuring flask, and isoparaffin (specific gravity 0.755 (15°C)) was added to make up to 100 mL to prepare a stock solution. The specific gravity of the stock solution at 25°C was 0.762.

2. Preparation of Aerosol Products According to Table 1, aerosol products of Examples 1 to 5 and Comparative Examples 1 to 4 were prepared.

Example 1
An aerosol pressure can (full capacity 579 mL) was filled with 24 mL of the concentrate and closed with an aerosol valve (stem hole area 0.4 mm ² , circular stem hole). Then, 228 mL of liquefied petroleum gas LPG2.0 (pressure 0.2 MPa at 25° C.) and 228 mL of dimethyl ether (DME) were filled under pressure as a propellant.
An injection button (nozzle diameter φ2.5 mm, nozzle area 4.9 ^mm2 ) was attached to the aerosol valve to obtain an aerosol sample. In addition, a nozzle with a tube inner diameter of 1.5 mm, a tube length of 113 mm, a nozzle diameter of φ1.5 mm, and a nozzle area of 1.8 ^mm2 was prepared as a switching nozzle for switching the injection pattern.

(Examples 2 to 5, Comparative Examples 1 to 4)
Aerosol samples were prepared in the same manner as in Example 1, except that the content ratio of the concentrate to the propellant, the composition of the propellant, the aerosol valve, the spray button and the nozzle were changed to those shown in Table 1.
The valve stem holes used in Examples 2, 4-5 and Comparative Examples 1-4 were circular, while the valve stem hole used in Example 3 was rectangular. Regarding the stem hole size in Table 1, a circular valve stem hole is indicated by "φ" and a rectangular valve stem hole is indicated by "□".

3. Evaluation of aerosol products The spray amount was measured for each of the aerosol samples of Examples 1 to 5 and Comparative Examples 1 to 4 when the switching nozzle was attached (spray button + switching nozzle) and when it was not attached (spray button only). When the switching nozzle was attached, the average particle diameter of the spray particles was measured at a distance of 25 cm, and when the switching nozzle was not attached, the average particle diameter of the spray particles was measured at a distance of 50 cm.
In addition, the aerosol samples with the switching nozzle attached were evaluated for the presence or absence of dripping when sprayed onto a window frame, and the aerosol samples without the switching nozzle attached were checked for their pest control effectiveness.

(1) Measurement of spray amount The aerosol sample was sprayed for 10 seconds at 25° C., and the weight loss from the weight of the aerosol sample before spraying was recorded as the spray amount. The results are shown in Tables 2 and 3.

(2) Measurement of the average particle size of sprayed particles (2-1) Measurement when the switching nozzle is attached (switching nozzle + spray button) A laser diffraction particle size analyzer (Microtrac BELL Corporation, "LDSA-1400A") was installed at a position 25 cm away in a straight line in the spray direction (horizontal direction) from the nozzle of the aerosol sample (nozzle nozzle), and the particle size (D50) was measured by spraying the aerosol sample toward the particle size analyzer.
This measurement was carried out twice, and the average was calculated as the average particle size (D50). The results are shown in Table 2.

(2-2) Measurement when the switching nozzle is not attached (only the spray button) A laser diffraction particle size analyzer (Microtrac-Bell Corporation's "LDSA-1400A") was installed at a position 50 cm away in a straight line in the spray direction (horizontal direction) from the nozzle of the aerosol sample (the nozzle of the spray button), and the particle size (D50) was measured by spraying the aerosol sample toward the particle size analyzer.
This measurement was carried out twice, and the average was calculated as the average particle size (D50). The results are shown in Table 3.

(3) Confirmation of dripping when spraying onto a window frame For the test, aerosol samples of Examples 1 to 5 and Comparative Examples 1 to 4 equipped with switching nozzles were used.
30 mL of each aerosol sample was sprayed onto an aluminum window frame (width 5 cm, length 90 cm) from a position 25 cm away from the nozzle nozzle, over an area of 0.045 ^m2 of the window frame, and the sprayed particles were allowed to adhere to the window frame. The presence or absence of dripping on the window frame surface was then visually confirmed.
The samples in which no dripping was observed were rated as "◯", and the samples in which dripping was observed were rated as "×". The results are shown in Table 2.

(4) Confirmation of pest control effect For the test, aerosol samples of Examples 1 to 5 and Comparative Examples 1 to 4 were used when the switching nozzle was not attached.
Two adult southern green stink bugs were placed in a KP cup. The sample was sprayed for three seconds at the southern green stink bugs from a position 50 cm away from the nozzle of the spray button. Immediately afterwards, the presence or absence of knockdown (falling over and being unable to move) was checked.
Those which knocked down the southern green stink bugs were rated as having a knockdown effect (◯), and those which did not knock down the bugs were rated as having no knockdown effect (×). The results are shown in Table 3.

(5) Confirmation of the Effect of Preventing Invasion of Pests Furthermore, a test to confirm the effect of preventing intrusion of pests was conducted using the aerosol sample of Example 3 equipped with a switching nozzle.
In mid-April, at a typical home in northern Hyogo Prefecture, where infestations of brown stink bugs are frequent, an aerosol sample was sprayed toward an aluminum window frame (5 cm wide, 180 cm long x 180 cm wide) on the balcony of the home, so that the amount of aerosol composition sprayed was approximately 70 g over the entire window frame. Note that spraying was performed from a position 25 cm away from the window frame to the nozzle outlet.
A day after the treatment, the condition of the balcony was checked to see if the brown stink bugs had died, and they had been unable to enter the house and had died on the balcony. Furthermore, for about a month after the treatment, no live brown stink bugs were seen around the treated window frames.

From the results in Table 2, in Examples 1 to 5, in which the aerosol composition was sprayed onto an aluminum window frame so that the average particle size of the spray particles was in the range of 4 to 50 μm, it was possible to adhere the aerosol composition to the window frame without dripping. Furthermore, from the results of the confirmation test of the pest intrusion prevention effect, it was found that an excellent effect of preventing the intrusion of pests was obtained when the spray particles were sprayed so that the average particle size was in the range of 4 to 50 μm.
It was also found from Table 3 that when the spray particles were sprayed so that the average particle diameter was in the range of 30 to 120 μm and the spray particles were allowed to adhere to pests, an excellent pest control effect was achieved. In addition, in Examples 1 to 5 and Comparative Examples 1 to 4 in which the switching nozzle was not attached, when the spray was applied to a window frame from a distance of 25 cm, dripping occurred.

<Test Example 2>
1. Preparation of Stock Solution Based on the formulation shown in Table 4, cyfluthrin and isopropyl myristate were measured out into a 100 mL measuring flask, and isoparaffin (specific gravity 0.755 (15° C.)) was added to make up to 100 mL to prepare a stock solution.

2. Preparation of Aerosol Products According to Table 5, aerosol products of Examples 6 to 7 and Comparative Example 5 were prepared.

(Examples 6 to 7, Comparative Example 5)
In the same manner as in Test Example 1, an aerosol sample was prepared according to the specifications in Table 5 for the content ratio of the concentrate to the propellant, the composition of the propellant, the aerosol valve, the spray button and the nozzle.
The valve stem hole used in Example 6 was circular, while the valve stem holes used in Example 7 and Comparative Example 5 were rectangular.

3. Evaluation of aerosol products For the aerosol samples of Examples 6 and 7 equipped with a switching nozzle (spray button + switching nozzle) and the aerosol sample of Comparative Example 5 (spray button only), the average particle diameter of the sprayed particles at a distance of 25 cm was measured, and a pest intrusion prevention test and the presence or absence of dripping when sprayed on a window frame were evaluated.

(1) Measurement of the average particle size of sprayed particles A laser diffraction particle size analyzer (Microtrac-Bell Corporation, "LDSA-1400A") was placed at a position 25 cm away in a straight line in the spray direction (horizontal direction) from the nozzle of the aerosol sample (the nozzle or the nozzle of the spray button), and the particle size (D50) was measured by spraying the aerosol sample toward the particle size analyzer.
This measurement was carried out twice, and the average was calculated as the average particle size (D50). The results are shown in Table 6.

(2) Pest Intrusion Prevention Test Test plots were prepared as shown in Figures 1(a) and (b). In Figure 1, when viewed from the side indicated by the arrow B, the depth direction is referred to as the front-rear direction, the width direction is referred to as the left-right direction, and the side walls are referred to as the "rear wall" and the "left wall", etc.
As shown in Fig. 1(a), two boxes (first box 1a, second box 1b) with an upper opening and measuring 15 cm in length x 15 cm in width x 15 cm in height were prepared and placed side by side so that their side walls were in contact with each other. A hole was drilled in the adjacent wall 2 at the corner of the bottom wall and the rear wall where the first box 1a and the second box 1b meet, allowing communication between the first box 1a and the second box 1b.
About 3 g of the aerosol sample was sprayed evenly onto an ABS resin rail member 4 having a long bottom plate and side plates rising in the longitudinal direction of the bottom plate as shown in Fig. 1(b) from a position 25 cm away from the aerosol sample nozzle. This was placed in the first box 1a with one end abutting against the left wall of the first box 1a and the other end penetrating a hole in the adjacent wall 2 and protruding into the second box 1b.
Thereafter, five southern green stink bugs (adults) 7 were released into the first box 1a, a tray 6 carrying water-soaked absorbent cotton 5 was placed in the second box 1b, the upper openings of the boxes 1a and 1b were covered with a transparent plate material 3, and the boxes were left overnight. The following day, the number of live southern green stink bugs that had invaded the second box 1b was counted.
The intrusion prevention rate (%) was calculated from the number of live southern green stink bugs that invaded according to the following formula. An intrusion prevention rate of 100% was evaluated as no intrusion "O" and any other rate was evaluated as intrusion "X". The results are shown in Table 6.
Invasion prevention rate (%) = (number of stink bugs released in the first box - number of live stink bugs that invaded the second box) / number of stink bugs released in the first box x 100

(3) Confirmation of dripping during spraying onto window frame 30 mL of each aerosol sample was sprayed onto an aluminum window frame (width 5 cm, length 90 cm) from a position 25 cm away from the nozzle of the aerosol sample onto an area of 0.045 ^m2 of the window frame, and the sprayed particles were allowed to adhere. Next, the presence or absence of dripping on the surface of the window frame was confirmed by visual inspection.
The samples in which no dripping was observed were rated as "◯", and the samples in which dripping was observed were rated as "×". The results are shown in Table 6.

From the results in Table 6, Examples 6 and 7 were confirmed to be effective in preventing pest intrusion, and there was no dripping onto the window frame. In contrast, Comparative Example 5, in which the average particle diameter (D50) of the sprayed particles at a distance of 25 cm from the nozzle of the aerosol sample was less than 4 μm, was unable to prevent pest intrusion. From this, it is presumed that spray particles with an average particle diameter (D50) of less than 4 μm are less effective at adhering to the body surface of pests as they pass through the object being sprayed, and therefore the effect of preventing pest intrusion is reduced. In addition, the smaller the average particle diameter of the sprayed particles, the more susceptible they are to environmental influences, so it is presumed that when used outdoors, the amount of particles adhering to the object may decrease due to the influence of wind, etc.

<Test Example 3>
Using the aerosol sample of Example 6 prepared in Test Example 2, a pest intrusion prevention test was conducted for rail members made of different materials, and the presence or absence of dripping was confirmed.

(1) Pest Intrusion Prevention Test According to the method described in (2) Pest Intrusion Prevention Test in Test Example 2, a pest intrusion prevention test was carried out using an aluminum member, an ABS resin member, and a cypress member as the rail member 4. The results are shown in Table 7.

(2) Confirmation of dripping when spraying window frame According to the method described in (3) Confirmation of dripping when spraying window frame in Test Example 2, a test was conducted to confirm the presence or absence of dripping using aluminum members, ABS resin members, and Japanese cypress members as window frames. The results are shown in Table 7.

From the results in Table 7, no dripping occurred when the aerosol sample of Example 6, which is this embodiment, was sprayed, regardless of whether the material of the target to be sprayed was aluminum (metal), ABS resin (resin), or cypress (wood). On the other hand, with regard to the prevention of pest intrusion, it was found that the pest intrusion prevention test using wooden rail members was not sufficient to prevent intrusion, and that the method of the present invention can exert an excellent pest control effect when used on metal or resin targets. Wood has a strong penetrating power of the chemical solution, so the chemical solution soaks into the material and is less likely to remain on the surface, which is thought to reduce the chemical solution that adheres to the pest's cuticle, making it difficult to effectively express the effects of the active ingredient.

1a First box 1b Second box 2 Adjacent wall 3 Transparent plate 4 Rail member 5 Absorbent cotton 6 Tray 7 Southern green stink bug

Claims (3)

An aerosol product for pest control that is sprayed on metal or resin objects and pests ,
The aerosol composition contains a concentrate containing an active ingredient and an organic solvent , and a propellant, and is filled in a pressure-resistant container;
The volume ratio of the concentrate to the propellant in the aerosol composition is 1:99 to 30:70 (concentrate:propellant);
The opening of the pressure-resistant container is closed by an aerosol valve, and an ejection button is attached to the aerosol valve;
The ratio of the area of the nozzle of the injection button to the area of the stem hole of the stem of the aerosol valve is 1 to 30, and the area of the nozzle of the injection button is 0.19 to 16 ^mm2 ;
A particle size switching mechanism is provided for switching the average particle size of the spray particles, and the particle size switching mechanism is attachable to and detachable from the nozzle of the spray button.
The ratio of the area of the nozzle of the particle diameter switching mechanism to the area of the stem hole of the stem of the aerosol valve is 1 to 10, and the area of the nozzle of the particle diameter switching mechanism is 0.8 to 1.8 ^mm2 ;
The aerosol product is switchable between spray pattern A, in which the average particle diameter (D50) of spray particles at a distance of 25 cm from the nozzle of the particle diameter switching mechanism is in the range of 4 to 50 μm, and spray pattern B, in which the average particle diameter (D50) of spray particles at a distance of 50 cm from the nozzle of the spray button is in the range of 30 to 120 μm, and is sprayed at the metal or resin target using spray pattern A and at the pests using spray pattern B. 2. The aerosol product according to claim 1, wherein the object is a building component that separates indoors from outdoors. A method for controlling pests, comprising using the aerosol product according to claim 1 or 2.

Images