Quantitative spraying device for pest control

Abstract

To provide a fixed quantity injection device for insect pest control excellent in an insect pest control effect for insect pests to be controlled.SOLUTION: An injection mechanism of a fixed quantity injection device for insect pest control includes an injection part equipped with a plurality of injection ports and a flow passage for supplying an insect pest control agent to the plurality of injection ports, and can execute fixed quantity injection in which total one time injection quantity of the insect pest control agent is a fixed quantity in the range of 0.5-2.0 ml. The injection mechanism causes at least one cluster of the insect pest control agent to exist for each of a plurality of division spaces dividing the space around a central axis of an injection nozzle so that a value equally dividing 360° with a division number the same as the number of injection ports is a central angle around the axis.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] The present invention relates to a metering injection device for pest control, comprising a pest control agent containing a pest control component, a container for storing the pest control agent, and an injection mechanism for injecting a fixed amount of the pest control agent from the container.

Background Art

[0002] Conventionally, aerosol injection devices (so-called aerosols) have been used for indoor pest control and the like. This type of injection device generally stores an aerosol composition containing a stock solution containing a pest control component and a propellant in a container, and is configured to eject the aerosol composition from an injection nozzle provided on the container along with an injection operation by a user. For example, one of the conventional aerosol injection devices is configured to eject the aerosol composition from a single injection port provided in the injection nozzle toward the space on the front side of the injection nozzle (see, for example, Patent Document 1).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] The above-described conventional injection device is configured to directly spray the aerosol composition onto the pests to be controlled. On the other hand, in recent years, an injection device has been proposed that sprays the aerosol composition into a space where pest control is desired, retains fine particles and the like containing the pest control component in the space, or gradually releases the aerosol composition adhering to the walls and floors of the space into the space, thereby achieving continuous pest control in the space. In both the former injection device and the latter injection device, further improvement in the pest control effect on the pests to be controlled is desired.

[0005] One of the objects of the present invention is to provide a metering injection device for pest control that has an excellent pest control effect on pests to be controlled.

Means for Solving the Problems

[0006] [1] In a first aspect of the present invention, the metering injection device for pest control includes a pest control agent containing a pest control component, a container for storing the pest control agent, and an injection mechanism for injecting a fixed amount of the pest control agent from the container, The injection mechanism has an injection part provided with a plurality of injection ports through which the pest control agent is injected, and is configured to enable metering injection in which the amount of one injection of the pest control agent injected from the plurality of injection ports is a fixed amount within the range of 0.5 to 2.0 ml, The space centered on the straight line including the central axis of the injection part is divided into a plurality of divided spaces such that the value obtained by equally dividing 360° with the same number of divisions as the plurality of injection ports is the magnitude of the central angle around the straight line, and at least one cluster of the pest control agent injected from each of the plurality of injection ports is present in each of the plurality of divided spaces.

[0007] [2] In a second aspect of the present invention, in the metering injection device for pest control according to the first aspect, at least one opening of the plurality of injection ports is configured to be inclined with respect to the plane orthogonal to the straight line.

[0008] [3] In a third aspect of the present invention, in the metering injection device for pest control according to the first aspect or the second aspect, the nozzle corresponding to at least one of the plurality of injection ports is configured to be inclined with respect to the plane orthogonal to the straight line.

[0009] As a result of the inventor's intensive study on the metering injection device for pest control according to the above first aspect, regarding such a metering injection device, the amount of a single injection of a pest control agent injected from a plurality of injection ports is determined to be a fixed amount within the range of 0.5 to 2.0 ml (for example, 1.0 ml), and a space centered on a straight line including the central axis of the injection part (injection button, injection nozzle, etc.) is divided into a plurality of divided spaces such that the value obtained by equally dividing 360° with the same number of divisions as the plurality of injection ports is the magnitude of the central angle around the straight line. If at least one cluster of the pest control agent exists in each of the plurality of divided spaces (see FIGS. 3(a) and 3(b)), it has been clarified that an extremely excellent pest control effect can be obtained. Further, according to the metering injection device for pest control of this configuration, every time the user performs an injection operation, a predetermined fixed amount of the pest control agent is injected, so that variations in the pest control effect due to the user's operation method are less likely to occur, and an excellent pest control effect can be stably exhibited.

[0010] Therefore, the metering injection device for pest control of this configuration is excellent in the pest control effect on the pests to be controlled.

[0011] According to the metering injection device for pest control according to the above second aspect, since at least one opening of the plurality of injection ports is inclined with respect to a plane perpendicular to the straight line including the central axis of the injection part, a cluster of the pest control agent can be more surely made to exist in the divided space corresponding to the injection port. Note that the larger the number of injection ports whose openings are inclined as described above, the more preferable it is, and it is even more preferable that the openings of all the injection ports are inclined as described above.

[0012] According to the metering injection device for pest control according to the above third aspect, since at least one nozzle corresponding to one of the plurality of injection ports is inclined with respect to a plane perpendicular to the straight line including the central axis of the injection part, a cluster of the pest control agent can be more surely made to exist in the divided space corresponding to the injection port. Note that the larger the number of injection ports whose nozzles are inclined as described above, the more preferable it is, and it is even more preferable that the nozzles of all the injection ports are inclined as described above.

Effects of the Invention

[0013] According to the present invention, a quantitative spraying device for pest control excellent in pest control effect against pests to be controlled can be provided.

[0014] As described above, the present invention has been briefly described. Further, the details of the present invention will be further clarified by reading through the embodiments for carrying out the invention described below (hereinafter referred to as "embodiments") with reference to the accompanying drawings.

Brief Description of the Drawings

[0015]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Embodiments for Carrying Out the Invention

[0016] <Embodiment> Hereinafter, with reference to the drawings, a metering injection device 10 for pest control according to an embodiment of the present invention (hereinafter simply referred to as "the metering injection device 10") will be described.

[0017] (Structure of the metering injection device for pest control) As shown in FIG. 1, the metering injection device 10 according to an embodiment of the present invention includes a hollow cylindrical container 11 filled with an aerosol composition containing a pest control component, and a valve stem 12 that protrudes upward along the axial direction of the container 11 near the center of the upper end of the container 11 and ejects the aerosol composition from the container 11 when pushed downward, and an aerosol cap 13 attached to the upper end of the container 11. The aerosol composition is composed of a stock solution containing a pest control component and a solvent and a propellant, as will be described later.

[0018] The aerosol cap 13 includes a cover portion 14 attached to the upper end of the container 11, and an actuator 16 to which an injection nozzle 15 communicating with the valve stem 12 is attached and which is swingably supported by the cover portion 14 and engages with the valve stem 12 from above. The injection nozzle 15 is housed and fixed in a nozzle housing chamber 19 provided in the actuator 16. The actuator 16 is swingable via a hinge 17 extending from the front portion on the tip side of the injection nozzle 15.

[0019] The cover portion 14 of the aerosol cap 13 is made of, for example, synthetic resin, and its lower end is locked to a mounting cup 18 provided at the upper end of the container 11. A virgin seal 20 covering the actuator 16 is integrally formed on the upper portion of the actuator 16.

[0020] The actuator 16 has a flow path 21 extending in the protruding direction (vertical direction; axial direction of the container 11) of the valve stem 12, and a flow path 22 communicating with the flow path 21 and extending perpendicular to the flow path 21. A nozzle housing chamber 19 in which the injection nozzle 15 is housed is connected to this flow path 22 in communication.

[0021] The valve stem 12 is assembled to be slidable in the vertical direction with respect to a housing (not shown) assembled to the mounting cup 18, and is constantly biased upward by the biasing force of a spring (not shown) interposed between the valve stem 12 and the housing. When the actuator 16 (in other words, the valve stem 12) cannot be pushed down, the valve hole (not shown) inside the valve stem 12 is sealed by a stem rubber (not shown) due to the biasing force of the spring. As a result, the storage chamber (not shown) of the housing that communicates and connects with the inside of the container 11 and the stem inner passage (not shown) that extends in the vertical direction inside the valve stem 12 that is communicated and connected to the flow path 21 of the actuator 16 are not in a communicating state.

[0022] When the actuator 16 (valve stem 12) is pushed down (that is, when the injection operation is performed), the valve hole of the valve stem 12 is separated from the stem rubber, and the storage chamber of the housing and the stem inner passage are communicated. As a result, the aerosol composition filled in the storage chamber of the housing is supplied to the flow path 31 and the injection port 37 (see FIGS. 2(a) to 2(d), etc.) of the injection nozzle 15 through the stem inner passage, the flow path 21, and the flow path 22, and the aerosol composition is injected from the injection port 37. When the aerosol composition is injected, the aerosol composition that has become particulate due to the action of the propellant becomes a cluster CL (aggregate) and diffuses from the injection port 37 to the front side of the injection nozzle 15 (see FIGS. 3(a) and 3(b)).

[0023] In this embodiment, the volume (shape) of the storage chamber of the housing is designed so that the total amount of the aerosol composition injected from the plurality of injection ports 37 becomes a fixed amount within the range of 0.5 to 2.0 ml by one injection operation. That is, the metering injection device 10 is a so-called "metering injection type" aerosol injection device. Here, the valve stem 12, the injection nozzle 15, and the actuator 16 correspond to the "injection mechanism" of the present invention, and the injection nozzle 15 corresponds to the "injection part" of the present invention.

[0024] The total amount of the aerosol composition ejected from the plurality of ejection ports 37 by one ejection operation may be any value within the range of 0.5 to 2.0 ml. For example, it is preferably a value within the range of 0.7 to 1.5 ml, more preferably a value within the range of 0.9 to 1.3 ml, and even more preferably 1 ml.

[0025] As shown in FIGS. 2(a) to 2(d), the resin injection nozzle 15 has a stepped cylindrical shape with a flow path 31 formed inside. The side surface shape of the injection nozzle 15 corresponds to the side surface shape of the nozzle housing chamber 19 provided in the actuator 16. In the present embodiment, the injection nozzle 15 includes a large-diameter portion 32 on the tip side and a small-diameter portion 33 on the base end side. An annular locking portion 34 for preventing the injection nozzle 15 from coming off (falling off) from the nozzle housing chamber 19 is provided so as to protrude radially outward at a predetermined position in the axial direction on the outer peripheral surface of the small-diameter portion 33.

[0026] The flow path 31 extends from the base end to the vicinity of the tip of the injection nozzle 15 along a straight line Ax including the central axis of the injection nozzle 15. In a state where the injection nozzle 15 is housed in the nozzle housing chamber 19, the base end side opening of the flow path 31 is communicatively connected to the flow path 22 in the actuator 16.

[0027] The tip side surface of the injection nozzle 15 is composed of a circular orthogonal surface 35 orthogonal to the straight line Ax and a conical surface 36 that extends radially outward and toward the base end side from the outer peripheral edge of the orthogonal surface 35 while being inclined with respect to the straight line Ax. A plurality (four in this example) of ejection ports 37 are formed in this conical surface 36. The plurality of ejection ports 37 are arranged at intervals in the circumferential direction around the straight line Ax (in this example, every 90°), and each extends along the straight line Ax and is communicatively connected to the flow path 31 at the ejection port 37a (see FIG. 2(d)).

[0028] Since the plurality of injection ports 37 are formed on the conical surface 36, the openings 37b of the plurality of injection ports 37 are inclined radially outward and toward the proximal end along the conical surface 36 from the straight line Ax (see Fig. 2(d)). In other words, the openings 37b of the plurality of injection ports 37 are configured to be inclined with respect to the plane orthogonal to the straight line Ax. For this reason, as shown in Fig. 3(a), when the aerosol composition (see the white arrow in the figure) that has passed through the flow path 31 passes through the plurality of injection ports 37 via the nozzle opening 37a and is then injected from the opening 37b, a cluster CL of the aerosol composition diffuses from each of the plurality of injection ports 37 in a state of being inclined radially outward.

[0029] Note that the injection port 37 represents the space portion connecting between the internal flow path 31 of the injection nozzle 15 and the outside of the injection nozzle 15. Further, the nozzle opening 37a represents the opening portion that is closest to the inside of the injection nozzle 15 (i.e., the flow path 31 side) among the injection ports 37, and the opening 37b represents the opening portion that is closest to the outside of the injection nozzle 15 among the injection ports 37.

[0030] Furthermore, in the present embodiment, as shown in Fig. 3(b), the clusters CL of the aerosol composition that are injected and diffused from each of the four injection ports 37 exist in each of the four divided spaces obtained by dividing the space on the front side of the injection nozzle 15 by a dividing line L that passes through the midpoint between the adjacent injection ports 37 in the circumferential direction. The size of each divided space (the size of the central angle θ) is 90°. In other words, the space centered on the straight line Ax is divided into a plurality of divided spaces (spaces separated by the dividing line L) such that the value obtained by equally dividing 360° by the same number of divisions (= 4) as the plurality of injection ports 37 is the size of the central angle θ around the straight line, and the injection nozzle 15 is configured such that at least one cluster CL of the aerosol composition injected from each of the plurality of injection ports 37 exists in each of the plurality of divided spaces.

[0031] Thus, in this embodiment, since the number of injection ports 37 is four, the number of divided spaces is four, and the size (central angle) of each divided space is 90°. However, the number of injection ports 37 is not limited to four. As long as the clusters CL of the aerosol composition diffusing from each of the plurality (two or more) of injection ports 37 are present in each of the divided spaces divided by the same number of divisions as the plurality of injection ports 37 around the straight line Ax, there is no particular limitation. For example, as shown in FIG. 4, the number of divided spaces and the size (central angle) of each divided space can be set according to the number (two or more) of injection ports 37.

[0032] For example, when the number of injection ports 37 is three, as shown in FIGS. 5(a) to 5(d) corresponding to FIGS. 2(a) to 2(d), the three injection ports 37 formed on the conical surface 36 are arranged at intervals in the circumferential direction around the straight line Ax (in this example, every 120°). In this case, as shown in FIG. 4, the number of divided spaces is three, and the size (central angle) of each divided space is 120°.

[0033] In the examples shown in FIGS. 2(a) to 2(d) and FIGS. 5(a) to 5(d), due to the openings 37b of the plurality of injection ports 37 being inclined radially outward from the straight line Ax along the conical surface 36, the clusters CL of the aerosol composition are inclined and easily diffused radially outward. As shown in FIGS. 2(d) and 5(d), in these examples, the nozzles 37a of the plurality of injection ports 37 are not particularly inclined with respect to the plane orthogonal to the straight line Ax.

[0034] On the other hand, as an example different from the examples shown in FIGS. 2(a) to 2(d) and FIGS. 5(a) to 5(d), as shown in FIGS. 6(a) to 6(d), a plurality of injection ports 37 may be configured using the grooves 41, 42 extending radially outward to make the clusters CL of the aerosol composition inclined and easily diffused radially outward.

[0035] Specifically, the nozzle 15 shown in FIGS. 6(a) to 6(d) has a stepped cylindrical shape in which a small-diameter portion 38 is formed on the further tip side of a large-diameter portion 32 located on the tip side of the small-diameter portion 33. The tip side surface of the small-diameter portion 38 is composed only of a circular orthogonal surface 39 orthogonal to the straight line Ax. In particular, as shown in FIGS. 6(c) and 6(d), the flow path 31 of the nozzle 15 extends continuously from the large-diameter portion 32 to the vicinity of the tip of the small-diameter portion 38.

[0036] On the orthogonal surface 39, a pair of grooves 41 extending in the vertical direction and a pair of grooves 42 extending in the horizontal direction are formed. Each of the grooves 41, 42 extends radially from the radially inner end portion equidistant from the straight line Ax to the outer peripheral edge of the orthogonal surface 39 and constitutes an injection port 37. The injection port 37 communicates with the flow path 31 at a nozzle opening 37a at the radially inner end portion of the grooves 41, 42. That is, each of the grooves 41, 42 extends radially outward from the corresponding nozzle opening 37a and is open at the radially outer end portion.

[0037] As shown in FIG. 6(c), the bottom surfaces 41a of the pair of grooves 41 extend in a direction orthogonal to the straight line Ax (i.e., along the radial direction) from the nozzle opening 37a. On the other hand, as shown in FIG. 6(d), the bottom surfaces 42a of the pair of grooves 42 extend inclined with respect to the straight line Ax radially outward and toward the base end side from the nozzle opening 37a.

[0038] In particular, as shown in FIG. 6(d), by configuring the nozzle opening 37a to be inclined with respect to the surface orthogonal to the straight line Ax, the aerosol composition passing through the nozzle opening 37a is guided to the groove 42 and is injected from the injection port 37, and the cluster CL of the aerosol composition is likely to diffuse in a state inclined radially outward.

[0039] Incidentally, also in the aspect of the injection nozzle 15 represented by any of FIGS. 2(a) to 2(d), FIGS. 5(a) to 5(d), and FIGS. 6(a) to 6(d) described above, the injection pressure of the aerosol composition at a position 20 cm away from the injection port 37 is preferably 0.1 to 20 gf, more preferably 0.3 to 10 gf, and even more preferably 0.5 to 5 gf. This injection pressure is measured by using a digital force gauge (model number: DS2-2N, manufactured by IMADA Co., Ltd.) laid horizontally at a distance of 20 cm from the injection port 37 of the metering injection device 10 under room temperature conditions of 25°C. When the aerosol composition is injected toward the center of a Φ60 mm circular flat plate attached to the digital force gauge, the maximum detected value is taken as the injection load, and the average value of the injection load is calculated.

[0040] Furthermore, from the viewpoint of setting the injection time to a value within a desired range, the total opening area of the openings 37b of the injection port 37 is preferably 0.05 to 8 mm 2 more preferably 0.2 to 4.0 mm 2 even more preferably 0.4 to 3.0 mm 2 Also, from the viewpoint of setting the injection time to a value within a desired range, the total opening area of the nozzle openings 37a (liquid injection portions) shown in FIGS. 2(d), 5(d), 6(c), and 6(d) is preferably 0.05 to 8 mm 2 more preferably 0.2 to 3.0 mm 2 even more preferably 0.4 to 2.5 mm 2 even more preferably.

[0041] Furthermore, the injection time for one injection operation is preferably within 0.8 seconds, more preferably 0.2 to 0.7 seconds, and even more preferably 0.3 to 0.7 seconds. By adopting such an injection time, it is considered that the volatility of the pest control component can be efficiently increased, and the persistence of the efficacy of the pest control component can be enhanced. Examples of methods for adjusting the injection time for one injection operation include, for example, a method of adjusting the inner diameter of the injection port 37 and a method of adjusting the injection pressure.

[0042] The aerosol composition filled in the container 11 is composed of a stock solution containing a pest control component and a solvent, and a propellant.

[0043] The pest control component is a component capable of killing, repelling, knocking down, etc. the target pests. The type of the pest control component is not particularly limited, and known compounds can be used.

[0044] For example, as pest control ingredients, pyrethroid compounds such as transfluthrin, cyfluthrin, permethrin, pyrethrin, allethrin, phthalthrin, resmethrin, flumethrin, phenothrin, empenthrin, prallethrin, imiprothrin, cyhalothrin, lambda-cyhalothrin, deltamethrin, dimefluthrin, meperfluthrin, tralomethrin, profluthrin, and metofluthrin; silicon compounds such as silafluofen; organophosphorus compounds such as fenitrothion, dichlorvos, chlorpyrifos-methyl, diazinon, and fenthion; carbamate compounds such as carbaryl and propoxur; oxadiazole compounds such as methoxadiazone; compounds such as methoprene, pyriproxyfen, fipronil, and amidoflumet; essential oil components such as peppermint oil, orange oil, star anise oil, cinnamon oil, clove oil, turpentine oil, eucalyptus oil, hinoki oil, jasmine oil, neroli oil, peppermint oil, bergamot oil, butigren 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; 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, etc. These may be used alone or in combination of two or more.

[0045] The pest control ingredient may be appropriately selected according to the type of target pests. Examples of target pests include mosquitoes, flies, cockroaches, bees, stink bugs, cockroaches, ants, spiders, fleas, mites, lice, centipedes, earwigs, silverfish, spiders, horseflies, midges, fruit flies, termites, mayflies, planthoppers, weevils, garbage bugs, scissors bugs, moths, clothes moths, mealworms, and carpenterworms, etc. For flying pests such as mosquitoes, flies, cockroaches, bees, horseflies, midges, mayflies, fruit flies, carpenterworms, and planthoppers, transfluthrin, metofluthrin, profuthrin, phthalthrin, prallethrin, monofluorothrin, and silafluofen, etc. are suitable. Also, for crawling pests such as cockroaches, stink bugs, ants, spiders, fleas, mites, lice, centipedes, earwigs, silverfish, spiders, termites, weevils, garbage bugs, scissors bugs, and moths, phthalthrin, prallethrin, imiprothrin, permethrin, and phenothrin, etc. are suitable.

[0046] The content of the pest control ingredient is preferably 0.01 - 70 mass / volume% in the stock solution. When the pest control ingredient is 0.01 mass / volume% or more in the stock solution, a sufficient effect of the pest control ingredient can be obtained, and when it is 70 mass / volume% or less, the production suitability is improved. The content of the pest control ingredient is more preferably 0.1 mass / volume% or more, even more preferably 0.3 mass / volume% or more, more preferably 65 mass / volume% or less, and even more preferably 50 mass / volume% or less.

[0047] The stock solution can contain a solvent for purposes such as adjusting the viscosity of the stock solution, improving production suitability, and enhancing the penetrability of the chemical agent against pests. Examples of such solvents include hydrocarbon solvents, alcohol solvents, aromatic solvents, water, and ester solvents. Examples of hydrocarbon solvents include aliphatic and alicyclic hydrocarbons such as paraffinic hydrocarbons and naphthenic hydrocarbons, but kerosene such as JIS No. 1 kerosene is preferred. Specifically, normal paraffins and isoparaffins can be mentioned. As normal paraffins, those having 8 to 16 carbon atoms are typical, and examples include Neothiozol manufactured by Chuo Kasei Co., Ltd., Normal Paraffin MA manufactured by JXTG Energy Corporation, and Alcane C14-C17. As isoparaffins, those having 8 to 16 carbon atoms are typical, and examples include IP Clean LX, IP Clean HX, Super Sol FP25, Isoper-M, Isoper-H, Isoper-E, and Isoper-L manufactured by Idemitsu Kosan Co., Ltd. Examples of alcohol solvents include lower alcohols such as ethanol and propanol, polyhydric alcohols such as glycerin and ethylene glycol. Examples of aromatic solvents include toluene and xylene. Examples of ester solvents include isopropyl myristate, butyl myristate, hexyl laurate, and isopropyl palmitate.

[0048] The content of the solvent is preferably 30 to 99.99 mass / volume% in the stock solution. When the solvent is 30 mass / volume% or more in the stock solution, production suitability can be improved, and when it is 99.9 mass / volume% or less, sufficient efficacy can be ensured, which is preferred. The content of the solvent is more preferably 35 mass / volume% or more, even more preferably 50 mass / volume% or more, more preferably 99.9 mass / volume% or less, and even more preferably 99.5 mass / volume% or less.

[0049] Other components can be contained in the stock solution as long as the effects of the present invention are not impaired. Examples of other components include preservatives, pH adjusters, ultraviolet absorbers, deodorants, fragrances, bactericides, fungicides, antistatic agents, defoamers, synergists, inorganic powders, surfactants, and solubilizing agents.

[0050] The content of the stock solution can be appropriately changed according to the purpose of use of the metering injection device 10 and the combination with the propellant, and is not particularly limited. For example, it can be 1 to 50% by volume in the aerosol composition. When the stock solution is 1% by volume or more in the aerosol composition, the effect of the sufficient pest control component can be obtained, and when it is 50% by volume or less, the contamination by the stock solution can be reduced. The content of the stock solution is more preferably 3% by volume or more, still more preferably 5% by volume or more, and more preferably 40% by volume or less, still more preferably 30% by volume or less in the aerosol composition.

[0051] The propellant is a medium for injecting the above stock solution and is pressurized and filled into the pressure-resistant container together with the stock solution. Examples of the propellant include liquefied petroleum gas (LPG) such as propane, propylene, n-butane, and isobutane, liquefied gas such as dimethyl ether (DME), carbon dioxide gas, nitrogen gas, and compressed gas such as compressed air, and one or more of halogenated carbon gases such as HFC-152a, HFC-134a, HFO-1234yf, and HFO-1234ze can be used. The propellant to be used may be appropriately selected according to the compatibility with the stock solution and the container members of the aerosol valve.

[0052] The content of the propellant can be appropriately changed according to the purpose of use of the metered spray aerosol and the combination with the stock solution, and is not particularly limited. For example, it can be 50 to 99% by volume in the aerosol composition. When the propellant is 50% by volume or more in the aerosol composition, fine spray particles can be sprayed, so that the pest control component is more likely to diffuse and the efficacy of the pest control component is more likely to persist. Also, when the propellant is 99% by volume or less, a sufficient effect of the pest control component can be obtained. The content of the propellant is more preferably 60% by volume or more, even more preferably 70% by volume or more, and more preferably 97% by volume or less, even more preferably 95% by volume or less in the aerosol composition.

[0053] In addition, the volume ratio of the stock solution to the propellant in the aerosol composition is preferably 1:99 to 50:50, and more preferably 3:97 to 40:60. By setting such a volume ratio, a sufficient pest control effect can be obtained.

[0054] (Pest Control Evaluation of Metered Spray Device) Through various experiments, the inventor found that, as in the various embodiments described above, in the metered spray device 10, a plurality of injection ports 37 are provided in the injection nozzle 15, and the space centered on the straight line Ax is divided around the straight line Ax into the same number of divided spaces as the number of the plurality of injection ports 37, and at least one cluster CL of the aerosol composition ejected from each of the plurality of injection ports 37 is present in each of the divided spaces (see FIGS. 3(a) and 3(b)). Further, by setting the total amount of the pest control component ejected from the plurality of injection ports 37 per injection to a fixed amount (for example, 1.0 ml) within the range of 0.5 to 2.0 ml, a pest control effect extremely superior to that of the conventional injection devices described above can be obtained. This will be described in the test examples below.

[0055] According to the formulations shown in Table 1 below, aerosol compositions 1 to 5 were prepared containing a pest control ingredient, a solvent, and a propellant. Hereinafter, the aerosol composition may sometimes be referred to as the "composition". The specific gravity of each is as follows: transfluthrin is 1.388 (23 °C), ethanol is 0.785 (25 °C), isopropyl alcohol is 0.786 (20 °C), and liquefied petroleum gas (LPG) is 0.56 (20 °C).

[0056]

Table 1

[0057] For each of the compositions 1 to 6 shown in Table 1, a pressure-resistant can for aerosol (composition 1, 4, 5: capacity 142 ml, composition 2: capacity 59 ml, composition 3: capacity 287 ml, composition 6: capacity 142 ml) was filled with a stock solution that is a mixture of a pest control ingredient and a solvent, and the pressure-resistant can was closed with an aerosol valve (stem (ST) hole diameter 1.0 mm × 0.7 mm). Subsequently, liquefied petroleum gas (0.34 MPa (25 °C)) was pressurized and filled as a propellant. Furthermore, as shown in Tables 2 and 3 below, regarding the structure of the injection nozzle attached to the pressure-resistant can, the amount of the composition injected per injection (single injection amount), and the discharge amount of the pest control ingredient contained in the injected composition, the knockdown rate of the test insects in various combinations (Examples 1 to 5, Comparative Examples 1 to 9) was measured.

[0058] Specifically, regarding the "structure of the injection nozzle" in Tables 2 to 4, the "X type" in the structure of the injection nozzle represents an injection nozzle having four injection ports as shown in FIGS. 2(a) to 2(d) and FIGS. 6(a) to 6(d), the "three-hole type" represents an injection nozzle having three injection ports as shown in FIGS. 5(a) to 5(d), the "straight type" represents an injection nozzle having a single injection port that opens in the direction along the straight line of the injection nozzle (not shown), and the "horizontal type" represents an injection nozzle having a groove extending in the left-right direction on the front end surface perpendicular to the straight line of the injection nozzle and having a single injection port on the bottom surface of the groove (not shown). The total opening area of the openings 37b of the "X type" injection nozzle is 2.3 mm 2and the total opening area of the openings 37b of the "three-hole type" injection nozzle is 2.7 mm 2 and the total opening area of the openings 37b of the "horizontal type" injection nozzle is 0.5 mm 2 and the total opening area of the openings 37b of the "straight type" injection nozzle is 2.54 mm 2 is as follows.

[0059] Regarding the "knockdown rate" in Table 2 below, in the center of a laboratory room (5.4 m long × 3.6 m wide × 2.4 m high), an aerosol composition was sprayed under the conditions of Examples 1 to 3 and Comparative Examples 1 to 7. After 3 hours had passed since the spraying, female adult mosquitoes (about 100) were released into the test room as test insects. Then, the number of knocked-down insects (KD number) after 60 minutes was measured, and the knockdown rate (= KD number / total number of test insects × 100) was calculated.

[0060]

Table 2

[0061] Regarding the "knockdown rate" in Table 3 below, in the center of the same test room as in Table 2, an aerosol composition was sprayed under the conditions of Example 4 and Comparative Example 8. After 4 hours had passed since the spraying, adult house flies (mixed male and female, about 100) were released into the test room as test insects. Then, the number of knocked-down insects (KD number) after 30 minutes was measured, and the knockdown rate (= KD number / total number of test insects × 100) was calculated.

[0062]

Table 3

[0063] Regarding the "knockdown rate" in Table 4 below, in the center of the same laboratory as in Table 2, the aerosol composition was sprayed under the conditions of Example 5 and Comparative Example 9 respectively. After 6 hours had passed since the spraying, about 100 female adults of the sweet potato whitefly were released into the test chamber as test insects. Then, the number of knockdowns (KD number) after 60 minutes had passed was measured, and the knockdown rate (= KD number / total number of test insects × 100) was calculated.

[0064]

Table 4

[0065] As can be understood from the comparison between Examples 1 to 5 and Comparative Examples 1 to 9 shown in Tables 2 to 4, regardless of the type of pest control component and regardless of the amount of aerosol composition discharged per injection, the aerosol composition was sprayed so that a cluster CL was present in each of the above-described divided spaces from each of the plurality of injection ports 37 provided in the injection nozzle 15. Further, by setting the total amount of the aerosol composition sprayed from the plurality of injection ports 37 per injection to a fixed amount within the range of 0.5 to 2.0 ml (1.0 ml in the above example), it was clarified that an extremely excellent pest control effect can be obtained.

[0066] <Other embodiments> Note that the present invention is not limited to the above-described embodiments, and various modifications can be adopted within the scope of the present invention. For example, the present invention is not limited to the above-described embodiments, and modifications, improvements, etc. can be made as appropriate. In addition, the material, shape, dimensions, number, arrangement location, etc. of each component in the above-described embodiments are arbitrary as long as the present invention can be achieved, and are not limited.

[0067] For example, in the above embodiment, the nozzle 15 has a stepped cylindrical shape, but the nozzle 15 may have a simple cylindrical shape without a step on the side surface over the entire region in the direction of the straight line Ax.

[0068] Furthermore, in the embodiments shown in FIGS. 2(a) to 2(d) and FIGS. 5(a) to 5(d), all of the openings 37b of the plurality of injection ports 37 are configured to be inclined with respect to the plane orthogonal to the straight line Ax. However, in the aerosol injection device of the present invention, as long as at least one cluster CL of the aerosol composition can be present in each of the plurality of divided spaces, at least one of these openings 37b may be configured to be inclined with respect to the plane orthogonal to the straight line Ax.

[0069] Here, the features of the embodiments of the aerosol injection device 10 according to the present invention described above will be briefly described in [1] to [3] below, respectively. [1] A quantitative injection device 10 for pest control, comprising: a pest control agent containing a pest control component, a container (11) for storing the pest control agent, and an injection mechanism (12, 15, 16) for injecting a fixed amount of the pest control agent from the container, wherein the injection mechanism (12, 15, 16) has a cylindrical injection part (15) provided with a plurality of injection ports (37) through which the pest control agent is injected, and is configured to enable quantitative injection in which the amount of one injection of the pest control agent injected from the plurality of injection ports is a fixed amount within the range of 0.5 to 2.0 ml, a space centered on a straight line (Ax) including the central axis of the injection part is divided into a plurality of divided spaces such that the value obtained by equally dividing 360° with the same number of divisions as the plurality of injection ports is the magnitude of the central angle around the straight line, and at least one cluster (CL) of the pest control agent injected from each of the plurality of injection ports is present in each of the plurality of divided spaces. Quantitative injection device for pest control. [2] In the quantitative injection device for pest control according to [1] above, at least one opening (37b) of the plurality of injection ports (37) is configured to be inclined with respect to the plane orthogonal to the straight line (Ax). Quantitative injection device for pest control. [3] In the quantitative injection device for pest control according to [1] or [2] above, The nozzle (37a) corresponding to at least one of the plurality of injection ports (37) is configured to be inclined with respect to the plane orthogonal to the straight line (Ax). Quantitative injection device for pest control

[0070] This application is based on a Japanese patent application (Japanese Patent Application No. 2017-238159) filed on December 12, 2017, the content of which is incorporated herein by reference.

Industrial Applicability

[0071] The quantitative injection device for pest control of the present invention is excellent in the pest control effect on pests to be controlled. The present invention having this effect can be used, for example, as an injection device for injecting an aerosol composition into a space where pest control is desired to continuously control pests in the space.

Explanation of Signs

[0072] 10 Quantitative injection device for pest control 11 Container 12 Valve stem (injection mechanism) 15 Injection nozzle (injection mechanism) 16 Actuator (injection mechanism) 37 Injection port Ax Straight line CL Cluster of pest control agents

Claims

1. A metering injection device for pest control, comprising a pest control agent containing a pest control ingredient, a container for containing the pest control agent, and an injection mechanism for injecting a fixed amount of the pest control agent from the container, wherein the injection mechanism has an injection part provided with a plurality of injection ports through which the pest control agent is injected, and is configured to enable metering injection such that the total injection amount of the pest control agent injected at one time from the plurality of injection ports is a fixed amount within the range of 0.5 ml or more and 2.0 ml or less, divides a space centered on a straight line including the central axis of the injection part into a plurality of divided spaces such that a value obtained by equally dividing 360° with the same number of divisions as the plurality of injection ports is the magnitude of the central angle around the straight line, and is configured such that at least one cluster of the pest control agent injected from each of the plurality of injection ports exists in each of the plurality of divided spaces, each of the plurality of injection ports has a groove-like shape sandwiched between a pair of groove side surfaces extending in a direction away from the central axis, and the groove bottom surface sandwiched between the pair of groove side surfaces corresponding to one of the injection ports and the groove bottom surface sandwiched between the pair of groove side surfaces corresponding to the other injection port are different in the inclination angle with respect to the straight line, A metering injection device for pest control.

2. In the metering injection device for pest control according to Claim 1, the injection part has a cylindrical shape having an outer peripheral surface extending along the central axis, and the groove bottom surface sandwiched between the pair of groove side surfaces corresponding to at least one of the plurality of injection ports is continuous with the outer peripheral surface, A metering injection device for pest control.

3. In the metering injection device for pest control according to Claim 1 or Claim 2, the injection part further has a flow path for supplying the pest control agent to the plurality of injection ports, each of the plurality of injection ports communicates with the flow path through each of a plurality of injection nozzles provided at the flow path end of the flow path extending along the central axis, and at least one of the injection nozzles corresponding to the plurality of injection ports is configured to be inclined with respect to a plane perpendicular to the straight line, A metering injection device for pest control.

Images