Aerosol insecticide for pest control

Abstract

To provide an aerosol insecticide for pest control that combines both immediate and residual effects. [Solution] An aerosol agent for pest control comprising a stock solution containing pest control components and a propellant, characterized in that the stock solution contains two or more types of pest control components and the stock solution contains a paraffinic solvent and an alcoholic solvent of 13 w / w% or more.

Description

[Technical Field]

[0001] This invention relates to an aerosol agent for pest control. [Background technology]

[0002] Traditionally, aerosol insecticides for pest control have been used to directly apply to pests or to pre-treat areas where pests are likely to appear in order to control them. Aerosol insecticides for pest control are widely used because they are highly effective against pests, easy to use, and safe.

[0003] Aerosol insecticides for pest control consist of a concentrate (the insecticide itself, or a solution of the insecticide dissolved in a solvent) and a propellant, which are filled into an aerosol can. They are used by spraying them directly onto pests through the nozzle of the aerosol can using the pressure of the propellant, or by spraying them in areas where pests are likely to appear. The composition of the concentrate and the type of propellant are variously considered to produce the optimal effect depending on the target pest and the purpose of use.

[0004] For example, Patent Document 1 describes an aerosol agent containing, as a stock solution, a pest control composition that includes a pyrethroid insecticide active ingredient, an efficacy enhancer consisting of an amide solvent, and kerosene, for the purpose of fully extracting the efficacy of the pyrethroid insecticide component. [Prior art documents] [Patent Documents]

[0005] [Patent Document 1] Japanese Patent Publication No. 2020-002037 [Overview of the Initiative] [Problems that the invention aims to solve]

[0006] Petroleum-based solvents such as kerosene are commonly used to dissolve pyrethroid-based insecticide components, which are poorly soluble. Compared to other solvents, petroleum-based solvents have a high penetration rate into insects, resulting in superior rapid action against insects. On the other hand, due to their high penetration rate and physical properties such as viscosity, they can be less effective when applied to areas or objects where insects are likely to appear (hereinafter sometimes referred to as "target objects"), especially on materials that easily absorb liquids. Furthermore, depending on the user's technique, uneven application may occur, resulting in uneven treatment. In such cases, the duration of the insecticide component's effect on the surface of the target object becomes uneven. As a result, the persistence of the insecticide effect on the target object, also known as residual effect, is reduced.

[0007] Furthermore, considering the solubility of pest control components in solvents, solvents other than petroleum-based solvents, such as alcohol, may be used. However, compared to using only petroleum-based solvents, the penetration into pests is inferior, resulting in reduced effectiveness and failing to adequately meet the user's need to eliminate pests as quickly as possible upon discovery.

[0008] Thus, a major challenge in pest control is the difficulty in achieving both immediate and residual effects, and there has been a need for the development of aerosol pest control agents that possess both of these effects. Therefore, the object of the present invention is to provide an aerosol agent for pest control that combines both immediate and residual effects. [Means for solving the problem]

[0009] As a result of diligent research, the inventors of the present invention have found that the above problems can be solved by an aerosol agent containing two or more insect control components in the stock solution and containing a paraffinic solvent and an alcoholic solvent of 13 w / w% or more as solvents, and have completed the present invention.

[0010] In other words, the present invention relates to the following (1) and (2) aerosol agents for pest control. An aerosol agent for pest control containing a stock solution containing a pest control ingredient and a propellant, the pest control ingredient being two or more kinds, and the stock solution containing a paraffinic solvent and an alcohol solvent of 13 w / w% or more. The aerosol agent for pest control is characterized by the above. (2) The aerosol agent for pest control according to (1) above, characterized in that the stock solution contains a powder.

Effect of the Invention

[0011] According to the present invention, it is possible to provide an aerosol agent for pest control that maintains rapid efficacy against pests and has excellent residual efficacy.

Embodiment for Carrying Out the Invention

[0012] Hereinafter, embodiments of the present invention will be described in more detail.

[0013] The aerosol agent for pest control of the present invention contains a stock solution containing a pest control ingredient and a propellant, and an aerosol composition composed of the stock solution and the propellant is filled in a pressure-resistant container (aerosol can). The aerosol agent for pest control of the present invention contains two or more kinds of pest control ingredients, and is characterized in that the stock solution contains a paraffinic solvent and an alcohol solvent of 13 w / w% or more.

[0014] (Stock solution) The pest control ingredient contained in the stock solution is an ingredient that can kill, repel, knockdown, etc. the target pest. The aerosol agent for pest control of the present invention contains two or more kinds of pest control ingredients. By containing two or more kinds of pest control ingredients in the aerosol agent for pest control, it is easy to adjust the improvement of the effects of rapid efficacy and residual efficacy according to the characteristics of each pest control ingredient, and it is possible to make an aerosol agent for pest control that achieves both rapid efficacy and residual efficacy.

[0015] Known ingredients can be used as the pest control ingredient, and examples thereof include insecticidal ingredients, repellent ingredients, pest growth regulators, etc. Among them, insecticidal ingredients and / or repellent ingredients are preferable because of their high versatility and easy availability.

[0016] Examples of insecticidal components include pyrethroid compounds such as permethrin, cyfluthrin, bifenthrin, phenothrin, cyphenothrin, cypermethrin, tralomethrin, pyrethrin, allethrin, phthalthrin, resmethrin, flamethrin, empenthrin, prallethrin, imiprothrin, monfluorothrin, transfluthrin, metofluthrin, profluthrin, dimefluthrin, mepafluthrin; fenitrothion, dichlorvos, chlorpyrifos-methyl, diazinon, Examples include organophosphorus compounds such as fenthion; carbamate compounds such as carbaryl and propoxul; neonicotinoid compounds such as dinotefuran, imidacloprid, and clothianidin; juvenile hormone-like compounds such as methoprene and pyriproxyfen; oxadiazole compounds such as methoxadiazone; phenylpyrazole compounds such as fipronil and etibrol; trifluoromethanesulfonamide compounds such as amidoflumet; and metadiamide compounds such as brofuranil.

[0017] Examples of repellent components include various essential oil components such as peppermint oil, orange oil, fennel oil, cinnamon oil, clove oil, turpentine oil, eucalyptus oil, cypress oil, jasmine oil, neroli oil, peppermint oil, bergamot oil, butigrain oil, lemon oil, lemongrass oil, cinnamon oil, citronella oil, geranium oil, citral, l-menthol, citronellyl acetate, 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; dibasic acid esters such as dibutyl adipate; and compounds such as DEET, ethyl butylacetylaminopropionate, p-menthane-3,8-diol, and picaridin.

[0018] The combination of pest control ingredients should be appropriately selected according to the type of target pest. Target pests include flying insects and crawling insects, and are not limited to Diptera, Hemiptera, Lepidoptera, Hymenoptera, Isoptera, Coleoptera, Gnathoptera, Mayflies, or even pests belonging to Arachnida, Myriapods, and Isopoda. Specifically, this includes diptera flying insects such as mosquitoes, flies, midges, drain flies, fungus gnats, horseflies, black flies, and crane flies; hemipteran flying insects such as stink bugs, leafhoppers, planthoppers, and cicadas, or hemipteran crawling insects such as bed bugs and assassin bugs; lepidoptera flying insects such as moths; isopteran crawling insects such as cockroaches, or isopteran flying insects such as termites (winged insects); and hymenoptera insects such as bees and ants (winged insects). Examples include flying insects or Hymenoptera creeping insects such as ants; Coleoptera insects such as bark beetles, ground beetles, longhorn beetles, carpet beetles, and rove beetles; Gnathomorpha insects such as booklice; Mayflies and other flying Ephemeroptera insects; Spiders and mites and other Arachnida creeping insects; Red spider mites and other Arachnida creeping insects; Myriapods and other Myriapods and other Myriapods and other Isopoda creeping insects such as pill bugs.

[0019] In this invention, at least one of the two or more pest control components has a vapor pressure of 1 × 10 at 25°C. -5 It is preferable that the component has a vapor pressure of less than mmHg. -5 Components with a concentration below mmHg have low volatility and therefore excellent residual effect. After adhering to the treated object, they tend to maintain pest control effects for a long period, making it easier to achieve both immediate and residual effects.

[0020] The vapor pressure at 25°C is 1 × 10⁻⁶ -5 Examples of components with a value of less than mmHg include the following: Examples of pyrethroid compounds include phenothrin (vapor pressure: 1.43 × 10⁻⁶). -7 mmHg (21℃), permethrin (vapor pressure: 5.18 × 10⁻⁶) -8 mmHg (25℃), bifenthrin (vapor pressure: 1.34 × 10⁻⁶) -8 mmHg (25℃), cyfluthrin (vapor pressure: 1.5 × 10⁻⁶) -10 mmHg (20℃), cypermethrin (vapor pressure: 1.7 × 10⁻⁶)-9 mmHg (20 °C)), silafluofen (vapor pressure: 9.0×10 -7 mmHg (20 °C)), imiprothrin (vapor pressure: 1.35×10 -8 mmHg (25 °C)), etc. The vapor pressures of phenothrin, silafluofen, permethrin, and silafluofen are 1×10 -5 mmHg or less at 25 °C. Examples of carbamate compounds include carbaryl (vapor pressure: 1.36×10 -6 mmHg (25 °C)), etc. Examples of neonicotinoid compounds include dinotefuran (vapor pressure: 1.3×10 -8 mmHg (25 °C)), imidacloprid (vapor pressure: 3.0×10 -12 mmHg (25 °C)), etc. Examples of other insecticidal components include broflanilide (vapor pressure: 6.75×10 -11 mmHg (25 °C)), pyriproxyfen (vapor pressure: 9.8×10 -8 mmHg (25 °C)), etc.

[0021] At least one of the pest control components is preferably a component having a vapor pressure of 1×10 -6 mmHg or less at 25 °C. From the viewpoint of low decomposability and excellent residual efficacy, bifenthrin (vapor pressure: 1.34×10 -8 mmHg (25 °C)), permethrin (vapor pressure: 5.18×10 -8 mmHg (25 °C)), cypermethrin (vapor pressure: 1.7×10 -9 mmHg (20 °C)), silafluofen (vapor pressure: 1.5×10 -10 mmHg (20 °C)), broflanilide (vapor pressure: 6.75×10 -11 mmHg (25 °C)) are more preferred.

[0022] The undiluted solution may contain two or more pest control components, but from the viewpoint of improving the fluidity of the undiluted solution containing the pest control components, it is preferable to contain two to five components, and more preferably two to three. However, if the pest control component alone has the ability to quickly develop a pest control effect and is poorly volatile, and thus achieves the effects of the present invention, then only one pest control component may be included.

[0023] The content of pest control components in the undiluted solution is preferably 0.001 to 50 w / w%. A content of 0.001 w / w% or more of pest control components in the undiluted solution provides sufficient pest control, while a content of 50 w / w% or less improves the uniform diffusion of sprayed particles. The lower limit of the pest control component content is more preferably 0.005 w / w% or more, even more preferably 0.01 w / w% or more, and particularly preferably 0.05 w / w% or more. The upper limit is more preferably 40 w / w% or less, even more preferably 35 w / w% or less, and particularly preferably 30 w / w% or less. Note that the content of pest control components refers to the total amount of all pest control components.

[0024] The stock solution contains a solvent for purposes such as solubilizing the pest control components, adjusting the viscosity of the stock solution, adjusting the particle size of the sprayed particles, and increasing the penetration of the pest control components into the pests. Examples of such solvents include paraffinic solvents, alcoholic solvents, naphthenic solvents, aromatic solvents, esteric solvents, and water.

[0025] Examples of paraffinic solvents include normal paraffins and isoparaffins. Typical normal paraffins have 8 to 16 carbon atoms, such as Neothiosol manufactured by Sanko Chemical Industry Co., Ltd. Typical isoparaffins have 8 to 16 carbon atoms, such as IP Clean LX manufactured by Idemitsu Kosan Co., Ltd.

[0026] Examples of alcohol-based solvents include lower alcohols such as ethanol, propanol (n and iso), and isobutanol, as well as polyhydric alcohols such as glycerin and ethylene glycol. Among these, lower alcohols are preferred, and ethanol and isopropanol are more preferred.

[0027] Examples of naphthenic solvents include cyclopentane, methylcyclopentane, cyclohexane, methylcyclohexane, ethylcyclohexane, 1,3-dimethylcyclohexane, 1,4-dimethylcyclohexane, cycloheptane, methylcycloheptane, cyclooctane, methylcyclooctane, cyclononane, and cyclodecane.

[0028] Examples of aromatic solvents include toluene and xylene.

[0029] Examples of ester-based solvents include isopropyl myristate, hexyl laurate, and isopropyl palmitate.

[0030] The present invention provides an aerosol insecticide containing a paraffinic solvent and an alcohol-based solvent at a concentration of 13 w / w% or more in the stock solution. Through our research, we have found that by using both a paraffinic solvent and an alcohol-based solvent in combination, and by ensuring that the alcohol-based solvent content in the stock solution is 13 w / w% or more, both the rapid action and residual effect of the insecticide component can be enhanced and achieved simultaneously. During our research, we found that when using a paraffinic solvent alone, the active ingredient does not remain on the surface as easily as it should when applied to materials that easily absorb liquids, such as wood, resulting in a decrease in residual effect. We then found that by incorporating an alcohol-based solvent, this decrease in residual effect can be suppressed. In other words, since paraffin-based solvents are components that easily penetrate pests, including them enhances the rapid action of the pest control component. Since alcohol-based solvents spread easily on the surface of the object being treated, it is presumed that including 13 w / w% or more of alcohol-based solvent makes it easier for the pest control component to remain on the surface of the object being treated when the aerosol composition adheres to it, thereby enhancing the residual effect of the pest control component. Therefore, the pest control aerosol agent of the present invention is suitable for direct spraying onto pests, as well as for use on objects made of materials that easily absorb liquids, such as wood.

[0031] Paraffin-based solvents may be used individually or in combination of two or more types. The paraffin-based solvent is preferably present in the undiluted solution at a concentration of 0.1 w / w% or more and less than 87 w / w%. A paraffin-based solvent content of 0.1 w / w% or more enhances the rapid action of the pest control component, while a content of less than 87 w / w% allows for uniform treatment during object application. The lower limit of the paraffin-based solvent content is more preferably 0.5 w / w% or more, even more preferably 1 w / w% or more, and the upper limit is more preferably 86.9 w / w% or less, even more preferably 80 w / w% or less, and particularly preferably 75 w / w% or less.

[0032] Alcohol-based solvents may be used individually or in combination of two or more types. The undiluted solution contains 13 w / w% or more of the alcohol-based solvent, preferably 15 w / w% or more, more preferably 20 w / w% or more, and even more preferably 26 w / w% or more. Furthermore, from the viewpoint of maintaining rapid effectiveness when sprayed directly onto pests, the upper limit of the alcohol-based solvent content is preferably 85 w / w% or less, preferably 80 w / w% or less, more preferably 75 w / w% or less, and even more preferably 65 w / w% or less. In other words, the undiluted solution preferably contains 13 to 85 w / w% of the alcohol-based solvent.

[0033] The preferred ratio of alcohol-based solvent to paraffin-based solvent by mass is 13:87 to 85:15.

[0034] The stock solution may contain one or more of the above-mentioned solvents other than paraffinic solvents and alcoholic solvents, in a quantity that does not impair the effects of the present invention.

[0035] Furthermore, it is preferable that the aerosol agent for pest control of the present invention contains powder in the undiluted solution. By including powder in the aerosol agent, the residual effect of the pest control component on the surface of the treated object can be increased, and the frequency of contact with pests can be increased, thereby enhancing the pest control efficacy after treatment. In addition, the powder has excellent dispersibility in the undiluted solution, and when the aerosol composition is applied to the treated object, the formation of clumps where the powder aggregates on the surface of the treated object can be suppressed, and the pest control component can be uniformly attached.

[0036] Conventional powders can be used, and their material, shape, particle size, particle structure, etc., can be selected as appropriate. Examples include inorganic powders, organic powders, pigments, etc. Examples of inorganic powders include silicon dioxide (silica), titanium dioxide, calcium carbonate, magnesium silicate, aluminum silicate, magnesium aluminometasilicate, titanium dioxide, zeolite, talc, kaolin, mica, sericite, magnesium carbonate, calcium sulfate, hydroxyapatite, ceramic powder, boron nitride, and molybdenum disulfide. Examples of organic powders include cyclodextrin, polyamide resin powder, polyethylene powder, polystyrene powder, polymethyl methacrylate powder, cellulose powder, silicone resin powder, chlorohydroxyaluminum, tolnaphthate, lidocaine, and chlorohexidine gluconate. Examples of pigments include titanium dioxide, iron oxide, yellow iron oxide, carbon black, ultramarine, aluminum powder, and copper powder. These may be used individually or in combination of two or more. Among these, silicon dioxide is preferred because it is less likely to affect spraying failure of the aerosol agent for pest control and enhances its residual effect.

[0037] The shape of the powder is not particularly limited, but examples include spherical, rod-shaped, plate-shaped, needle-shaped, irregularly shaped, flaky, and spindle-shaped powders. Among these, spherical powders are preferred from the viewpoint of preventing clogging in aerosol valves and spraying mechanisms.

[0038] The particle size of the powder is preferably 1 to 25 μm as an average particle size, more preferably 1.5 to 20 μm, and even more preferably 2 to 15 μm. When the average particle size of the powder is within the above range, the contents can be sprayed in a desired form such as a mist without disrupting the spray pattern. The average particle size of the powder is the volume average particle size and can be measured by, for example, ISO 13320, the Coulter counter method (Coulter multisizer method), etc.

[0039] The specific surface area of ​​the powder is 50-500 m². 2 It is preferable that the amount be / g, and 100-400m 2 / g is more preferable, 150-350m 2A value of / g is even more preferable. When the specific surface area of ​​the powder is within the above range, it can support the pest control component and enhance the residual effect of the pest control component on the pests and the surface of the treated object. The specific surface area of ​​the powder can be measured by methods such as the BET method or ISO 5794-1.

[0040] The oil absorption capacity of the powder is preferably 35 mL / 100g or more, more preferably 100 mL / 100g or more, and even more preferably 200 mL / 100g or more. When the oil absorption capacity of the powder is within the above range, it can support the pest control component and enhance the residual effect of the pest control component on pests and the surface of the treated object. The oil absorption capacity of the powdered material can be measured by methods conforming to, for example, JIS K5101, ASTM D2414, ISO4656, etc.

[0041] Furthermore, the powder may be porous, non-porous, or hollow.

[0042] The powder content is preferably 0.001 to 5 w / w%, more preferably 0.005 to 1 w / w%, even more preferably 0.01 to 3 w / w%, and particularly preferably 0.05 to 2 w / w% in the undiluted solution. Including 0.001 w / w% or more of powder can enhance the residual efficacy of the pest control component, while a content of 5 w / w% or less is less likely to affect spraying failure.

[0043] The stock solution may contain other known components, to the extent that they do not impair the effects of the present invention. Examples of other components include fragrances, deodorizers, disinfectants, sterilizers, preservatives, pH adjusters, UV absorbers, inorganic substances, surfactants, and solubilizers.

[0044] The stock solution can be prepared by following a known method, which involves heating each component as needed and adding and mixing them sequentially.

[0045] The amount of undiluted solution in the aerosol composition can be appropriately changed depending on the intended use of the aerosol agent for pest control and the combination with the propellant, and is not particularly limited, but for example it can be 1 to 70% by volume in the aerosol composition. If the amount of undiluted solution in the aerosol composition is 1% by volume or more, a sufficient pest control effect can be obtained, and if it is 70% by volume or less, the uniform diffusion of the sprayed particles can be improved. The lower limit of the amount of undiluted solution in the aerosol composition is more preferably 3% by volume or more, even more preferably 5% by volume or more, and the upper limit is more preferably 60% by volume or less, and even more preferably 50% by volume or less.

[0046] (propellant) The propellant is a medium for spraying the undiluted liquid mentioned above, and is pressurized and filled into a pressure vessel together with the undiluted liquid. As propellants, one or more types of liquefied petroleum gas (LPG) such as propane, propylene, n-butane, and isobutane, liquefied gases such as dimethyl ether (DME), compressed gases such as carbon dioxide, nitrogen gas, and compressed air, and halogenated carbon gases such as HFC-152a, HFC-134a, HFO-1234yf, and HFO-1234ze can be used. The propellant used should be appropriately selected in accordance with its compatibility with the stock solution and the container components such as aerosol valves.

[0047] The amount of propellant in the aerosol composition can be appropriately changed depending on the intended use of the pest control aerosol and the combination with the stock solution, and is not particularly limited, but for example it can be 30 to 99% by volume in the aerosol composition. If the amount of propellant in the aerosol composition is 30% by volume or more, the stock solution can be sprayed as spray particles, so the pest control components can be dispersed more easily and the pest control effect can be sustained. Also, if the amount of propellant is 99% by volume or less, a sufficient pest control effect can be obtained. The lower limit of the propellant content in the aerosol composition is more preferably 40% by volume or more, even more preferably 50% by volume or more, and the upper limit is more preferably 97% by volume or less, and even more preferably 95% by volume or less.

[0048] The volume ratio of the stock solution to the propellant in the aerosol composition is preferably 1:99 to 70:30, more preferably 3:97 to 60:40, and even more preferably 5:95 to 50:50. By using such a volume ratio, a sufficient pest control effect can be obtained.

[0049] The aerosol agent for pest control of the present invention is configured such that the above-mentioned stock solution and propellant are filled into a pressure-resistant container for aerosols, the opening of the pressure-resistant container is closed by an aerosol valve, and a spraying member is attached to the aerosol valve.

[0050] (Aerosol valve) The aerosol valve comprises an opening / closing member for switching communication between the inside and outside of a pressure vessel by operation of the spraying member by the user, a housing to which the opening / closing member is attached, and a mounting member for holding the housing in a predetermined position on the pressure vessel. The opening / closing member also includes a stem that slides up and down in conjunction with the spraying member. The sliding of the stem switches between communication (spraying state) and blockage (non-spraying state) of the aerosol composition. The housing has a housing hole for taking in the aerosol composition from the pressure vessel. The stem has a stem hole for sending the aerosol composition taken into the housing to the spraying member. The path from the housing hole to the stem hole constitutes an internal passage through which the aerosol composition passes.

[0051] The shape of the stem hole in the aerosol valve stem may be circular or polygonal. The size of the stem hole should have a cross-sectional area of ​​0.05 to 4 mm², from the viewpoint of controlling the spray volume within a desired range. 2 Preferably, 0.1 to 3.5 mm 2 This is preferable. A stem hole may have one or more. The area of ​​the stem hole is the total area of ​​all stem holes if there are multiple.

[0052] (Injection component) The spraying component (spray button) is a component attached to a pressure vessel via an aerosol valve. The spray button has an internal passage for the aerosol composition taken in from the pressure vessel through the stem hole of the aerosol valve, and a nozzle through which the aerosol composition is sprayed.

[0053] The nozzle shape of the injection member may be circular or polygonal. If the nozzle shape is polygonal, the size of the nozzle should be the same as that of the circular nozzle.

[0054] From the viewpoint of setting the spray time within a desired range, the inner diameter of the nozzle of the spraying member (nozzle hole diameter) is preferably φ0.45 to 3.0 mm, more preferably φ0.5 to 2.0 mm, and even more preferably φ0.6 to 1.6 mm. Furthermore, the aerosol agent for pest control of the present invention may have multiple nozzles. Having multiple nozzles allows the agent to be sprayed over a wide area. When there are multiple nozzles, it is preferable that the inner diameter (nozzle hole diameter) of each nozzle is the same. The number of nozzles is preferably 1 to 6, and more preferably 2 to 5.

[0055] (Injection pressure) The aerosol agent for pest control of the present invention can be adjusted according to the intended use, but the spray pressure of the aerosol composition at a spray distance of 50 cm at 25°C is preferably 0.1 to 80 gf, more preferably 0.3 to 30 gf, and particularly preferably 0.5 to 25 gf. If the spray pressure at 50 cm from the nozzle is 0.1 gf or higher, it can adhere sufficiently to pests and the object to be treated. If it is 80 gf or lower, the rebound of the sprayed aerosol composition is reduced, preventing the pest control component from being blown away without adhering to the pest, and allowing the pest control component to adhere uniformly to the surface of the object to be treated.

[0056] The spray pressure can be determined by measuring the maximum value when the aerosol composition is sprayed once from a distance of 50 cm from the nozzle of the insecticide aerosol at room temperature of 25°C, towards the center of a φ60 mm circular plate attached to a digital force gauge (for example, IMADA Co., Ltd., model number: DS2-2N).

[0057] In the present invention, methods for adjusting the injection pressure include, for example, changing the gas pressure depending on the type of propellant, changing the diameter and shape of the nozzle hole of the button, adjusting the area of ​​the valve stem hole, and changing the ratio of the concentrate to the propellant.

[0058] (Injection amount) The spray volume of the pest control aerosol agent of the present invention is preferably 5 to 100 g per 10 seconds, and more preferably 10 to 70 g per 10 seconds, under conditions of 25°C. When the spray volume is within this range, the pest control component can be applied in an effective amount, and its effect can be fully obtained.

[0059] (Injected particle diameter) Furthermore, the present invention provides an aerosol agent for pest control in which the average particle diameter (D) of the sprayed particles at a distance of 25 cm from the nozzle of the aerosol agent (the discharge position of the aerosol composition) is measured. 50 The particle size (D) of the sprayed particles at a distance of 25 cm from the nozzle of the aerosol agent is preferably in the range of 4 to 100 μm. 50 If the average particle size (D) of the sprayed particles is 4 μm or larger, the diffusivity of the sprayed particles is increased, allowing for uniform treatment of pests and target objects. If it is 100 μm or smaller, the sprayed particles are less likely to become airborne. 50 The lower limit of the particle size is more preferably 10 μm or more, and the upper limit is more preferably 80 μm or less.

[0060] (Pest control methods) Methods for controlling pests using the aerosol agent for pest control of the present invention include spraying it directly onto the pests, or spraying it in advance onto the target object, i.e., places or objects where pests are likely to appear.

[0061] Examples of objects to be treated with the pest control aerosol agent of the present invention include building materials such as walls, floors, doors, and window frames. The materials of these building materials are not particularly limited, but examples include wood and concrete. Wood and concrete are materials that easily absorb liquids, but by using the pest control aerosol agent of the present invention, the pest control components can remain on the surface of the treated object, thereby increasing the residual effect. The aerosol agent for pest control of the present invention is suitable for use on materials that easily absorb liquids because the aerosol composition spreads easily across the surface of the object being treated when it comes into contact with it.

[0062] In this invention, when spraying an aerosol agent for pest control onto pests or objects to be treated, the spray volume of the aerosol composition is 10 to 600 g / m². 2 It is preferable to spray in such a manner. The aerosol composition should be 10-600 g / m². 2 The effects of the present invention can be fully obtained by spraying within this range. The spray volume of the aerosol composition is 15-500 g / m². 2 This is preferable. [Examples]

[0063] The present invention will be further described below with reference to examples and comparative examples, but the present invention is not limited to the following examples.

[0064] <Test Example 1: Direct Hit Efficacy Test 1> (Examples 1-4, Comparative Examples 1-3) The stock solutions 1-1 to 1-7 were prepared by mixing each component under agitation according to the formulations shown in Table 1. Furthermore, "Neothiozol" manufactured by Sanko Chemical Industry Co., Ltd. was used as the normal paraffin.

[0065] [Table 1]

[0066] A steel aerosol pressure container (full capacity 579 mL) was filled with 150 mL of the undiluted sample, and the container was closed with an aerosol valve (stem hole diameter: 0.45 mm, number of stem holes: 2, undertap diameter: φ1.0 mm, vapor tap diameter: φ0.7 mm). Subsequently, 300 mL of liquefied petroleum gas (LPG 0.2 MPa (20℃)) was pressurized and filled as a propellant. An aerosol agent for pest control was prepared by attaching a spray button (nozzle diameter: φ0.7 mm) to an aerosol valve. The stock samples used for the pest control aerosol agents in Examples 1-4 and Comparative Examples 1-3 are listed in Table 2.

[0067] Using the above-described aerosol insecticide for pest control, a direct-hit efficacy test was conducted as follows: 1. Female German cockroaches were prepared as test insects. A plastic cup (Konoike Plastics Co., Ltd. "KP-860M", 130mm in diameter, 100mm in height, approximately 880cc capacity) containing one test insect was placed on a stand tilted at a 2.45-degree angle. 3. An aerosol insecticide for pest control was sprayed onto the test insect for 2 seconds from a distance of 50 cm vertically from the bottom surface of the plastic cup. 4. The treated test insects were transferred to clean plastic cups, and the time it took for the test insects to be knocked down was measured. 5. Three trials were conducted for each case, and the average knockdown time was calculated.

[0068] The results are shown in Table 2.

[0069] [Table 2]

[0070] As shown in Table 2, Comparative Example 3, which used only an alcohol-based solvent, had an average knockdown time of 32 seconds, while Examples 1-4 and Comparative Examples 1-2 showed little difference in average knockdown time, averaging 3-4 seconds. From these results, it was found that using both paraffin-based and alcohol-based solvents in the stock solution does not reduce the rapid action of the pest control component.

[0071] <Test Example 2: Direct Hit Efficacy Test 2> (Examples 5-8, Comparative Examples 4-6) The stock solutions 2-1 to 2-7 were prepared by mixing each component under agitation according to the formulations shown in Table 3. Furthermore, "Neothiozol" manufactured by Sanko Chemical Industry Co., Ltd. was used as the normal paraffin.

[0072] [Table 3]

[0073] In the same manner as in Test Example 1, aerosol insecticides for pest control were prepared using each stock solution sample for Examples 5-8 and Comparative Examples 4-6, and their efficacy against German cockroaches was confirmed. The stock solution samples used for the aerosol insecticides in Examples 5-8 and Comparative Examples 4-6 are listed in Table 4.

[0074] The results are shown in Table 4.

[0075] [Table 4]

[0076] Table 4 shows that a similar trend was observed in Test Example 2, which used a different pest control component than that in Test Example 1. Specifically, in Comparative Example 6, which used only an alcohol-based solvent, the average knockdown time was 113 seconds, which was significantly longer. In contrast, no significant difference in knockdown time was observed in Examples 5-8 and Comparative Examples 4-5. Therefore, Test Example 2 also shows that using both a paraffin-based solvent and an alcohol-based solvent in the stock solution does not reduce the rapid action of the pest control component.

[0077] <Test Example 3: Residual Efficacy Test> (Examples 9-18, Comparative Examples 7-10) The stock solutions 3-1 to 3-14 were prepared by mixing each component under agitation according to the formulations shown in Table 5. The silicon dioxide used is "Toxil NP" manufactured by Oriental Silicas Corporation (average particle size 10.3 μm, specific surface area 190 m²). 2 ( / g, oil absorption capacity 270 mL / 100 g) was used. In addition, "Neothiosol" manufactured by Sanko Chemical Industry Co., Ltd. was used as the normal paraffin, and "IP Clean LX" manufactured by Idemitsu Kosan Co., Ltd. was used as the isoparaffin.

[0078] [Table 5]

[0079] Residual efficacy tests were conducted using stock solution samples 3-1 to 3-14 as described below. The stock solution samples used in Examples 9 to 18 and Comparative Examples 7 to 10 are listed in Table 6. 1. Female German cockroaches were prepared as test insects. 2. 2 mL of the undiluted sample was dropped onto each piece of plywood (15 cm x 15 cm) and spread evenly. 3. After the plywood coated with the undiluted sample was left to stand overnight and air-dried, five test insects were placed on the sample-coated surface of the plywood, and the cup was covered with a plastic cup to allow the test insects to come into contact with the undiluted sample. 4. After standing for 15 minutes, the test insects were transferred to a clean plastic cup and left in a room at 25°C. After 24 hours, the presence or absence of death was checked, and the mortality rate was calculated. 5. Each case was tested twice, the average mortality rate was calculated, and evaluated according to the following criteria. <Evaluation Criteria> ◎: Mortality rate of 80% or higher ○: Mortality rate between 50% and 80% ×: Mortality rate less than 50%

[0080] The results are shown in Table 6.

[0081] [Table 6]

[0082] Comparisons between Examples 9-10 and Comparative Examples 7-8, and between Examples 11-12 and Comparative Examples 9-10, revealed that when paraffinic solvents and alcoholic solvents are used in combination in the stock solution, and the alcoholic solvent content is 13 w / w% or higher, the mortality rate after 24 hours is significantly higher, indicating improved residual efficacy. Furthermore, as shown in the results of Examples 13-18, similarly high mortality rates were obtained even when using different combinations of pest control components than in Examples 9-12, when using different types of alcoholic and paraffinic solvents, or when using other solvents (such as esteric solvents). This is thought to be because including 13 w / w% or more of alcoholic solvent makes it easier for the pest control components to remain on the surface of the treated object (such as plywood), and this effect is not dependent on the type of pest control component used, but is mainly due to the physical properties of the solvent composition.

[0083] The results from Test Examples 1-3 showed that by including a paraffinic solvent and an alcoholic solvent of 13 w / w% or more, it is possible to achieve both rapid action and residual effect while maintaining the rapid action of the pest control component. Furthermore, a comparison of Examples 9-10 and 11-12 in Test Example 3 revealed that including powder in the undiluted solution further increased the lethality rate and improved the residual efficacy of the pest control component.

[0084] <Test Example 4: Plate Processing Test> (Examples 19-22, Comparative Examples 11-13) The stock solutions 4-1 to 4-7 were prepared by mixing each component under agitation according to the formulations shown in Table 7. The silicon dioxide used is "Toxil NP" manufactured by Oriental Silicas Corporation (average particle size 10.3 μm, specific surface area 190 m²). 2Using a ratio of 270 mL / 100 g (oil absorption capacity), "Neothiozol" manufactured by Sanko Chemical Industry Co., Ltd. was used as the normal paraffin.

[0085] [Table 7]

[0086] The plate treatment tests were performed using stock solution samples 4-1 to 4-7 as described below. The stock solution samples used in Examples 19 to 22 and Comparative Examples 11 to 13 are listed in Table 8. 1. 100 μL of the undiluted sample was dropped onto each of the polyvinyl chloride boards (15 cm x 15 cm) whose surfaces were painted black. 2. After drying the undiluted sample on the polyvinyl chloride board by air drying, the area of ​​the liquid stain was circled with a marker pen and the area was measured. 3. The relative area of ​​the liquid stain area of ​​Comparative Example 13 (containing 100% isopropanol as the solvent) was calculated based on the following formula, with the liquid stain area set to 100%. Relative area of ​​the sample (%) = Area of ​​liquid stain in the sample / Area of ​​liquid stain in Comparative Example 13 × 100 4. In addition, liquid stains were visually inspected, and the presence or absence of powder clumps was evaluated according to the following criteria. <Evaluation Criteria> None: The powder is uniformly dispersed. Yes: The powder is not uniformly dispersed, and aggregation is observed.

[0087] The results are shown in Table 8.

[0088] [Table 8]

[0089] As shown in Table 8, the powder was uniformly dispersed in Examples 19-22, and the processing was even. Furthermore, the area of ​​liquid stains in Example 19 was more than twice that of Comparative Example 11, and approximately twice that of Comparative Example 12. In Examples 20-22, which contained a higher alcohol-based solvent than Example 19, the area of ​​liquid stains was even larger. Examples 19-22 exhibit excellent diffusion of the undiluted solution and are less prone to clumping, thus increasing the surface area on the treated object that pests can come into contact with, increasing the frequency of contact, and allowing for uniform application regardless of the user's application method. By using the pest control aerosol agent of the present invention, the pest control effect can be enhanced.

Claims

1. An aerosol insecticide for pest control comprising a stock solution containing an insecticide component and a propellant, An aerosol agent for pest control, characterized in that it contains two or more of the aforementioned pest control components, and the undiluted solution contains a paraffinic solvent and an alcoholic solvent of 13 w / w% or more.

2. The aerosol agent for pest control according to claim 1, characterized in that the undiluted solution contains powder.

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