JP2007023045A - Pest insect-controlling device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method by which pest insects are effectively controlled by homogeneously and effectively releasing a pest insect-controlling component evaporated by heating to a space without accompanying smoke. <P>SOLUTION: The method for controlling the pest insects comprises heating the pest insect-controlling component held in a substrate by a heating means so that the temperature at which the content of the pest insect-controlling component becomes an effective amount in the air, and the evaporation rate of the pest insect-controlling component becomes maximum is achieved within 5 min from the start of the heating to evaporate the pest insect-controlling component in the air to control the pest insects. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a method for controlling pests present in a human living environment. In particular, the present invention relates to a pest control method capable of quickly, uniformly and efficiently releasing a pest control component evaporated by heating.

  Conventionally, there are various forms of methods for controlling pests present in the human living environment. Among them, electric mosquito traps (mat type, liquid type) and the like are known as methods for applying to spaces. It has been. These electric mosquito traps are intended to be used stably for a long period of time (for example, 30 days to 120 days in the liquid type), and gradually volatilize the insecticidal components in the use space. These target pests are flying pests such as mosquitoes, and they are not effective against pests that live on the back of rugs and mites such as cockroaches and mites and furniture. Usually, a fumigant having a stronger insecticidal action than these is widely used.

  This fumigant plays an important role in the sense of compensating for the drawbacks of the above-mentioned electric mosquito catcher, and has the advantage that the insecticidal component can be evaporated in a short time. However, since smoke is accompanied when the insecticidal component is evaporated, there are drawbacks that it is mistaken for a fire or that a fire alarm malfunctions.

  An object of the present invention is to solve the above-described drawbacks, and more specifically, to provide an excellent pest control method that can effectively control pests present in a human living space. It is a further object of the present invention to provide a method for controlling pests that can quickly, uniformly and efficiently release a pest control component evaporated by heating.

As a result of intensive studies, the present inventors have found that the above object can be achieved by evaporating the pest control component by a specific heating pattern in the pest control method for heating and evaporating the pest control component. The invention of the configuration has been reached.
(1) The temperature at which the pest control component held in the substrate becomes an effective amount in the air within 5 minutes from the start of heating by the heating means, and the transpiration rate of the pest control component is maximized A pest control method, wherein the pest control component is evaporated to the air to evaporate the pest control component in the air.
(2) The pest control method according to (1), wherein the temperature is 200 ° C to 500 ° C.
(3) The pest control method according to (1) or (2), wherein the heating time by the heating means is within 5 minutes.

  In the present invention, within a short period of 5 minutes from the start of heating, the pest control component is heated so as to reach an effective amount in the air and the transpiration rate of the component is maximized, thereby controlling the pest. By transpiration of the components, the tranquilized pest control components are stably and uniformly diffused more effectively in the application space, and thereby the pests in the application space can be effectively controlled.

  Generally, in the method of exterminating pests by heating and evaporating the pest control ingredients, it is unclear whether the pest control ingredients will evaporate well when heated at a high temperature in a short time, and the pest control ingredients will decompose. There is also a possibility that. In the present invention, by evaporating the pest control component in the specific heating pattern, the above-mentioned disadvantages are eliminated, and the evaporated pest control component is uniformly and efficiently diffused in the application space. Each time it is used, there is no variation in the diffusibility of the pest control component, and the pest can be controlled stably.

  In the method of the present invention, the pest control component reaches an effective amount in the air within 5 minutes from the start of heating, and reaches a temperature at which the transpiration rate of the pest control component is maximized within 5 minutes from the start of heating. The pest control component in the substrate is heated. Here, the effective amount of the pest control component in the air means that the amount of the pest control component evaporated by heating is effective for killing or controlling the pests existing in the application space. Say. Also, the transpiration rate of the pest control component is the rate at which the pest control component transpirations by heating (amount of the component transpiration per unit time).

  Therefore, the temperature at which the pest control component becomes an effective amount in the air within 5 minutes from the start of heating, and the temperature at which the transpiration rate of the pest control component becomes maximum within 5 minutes from the start of heating varies depending on various parameters. Therefore, it can be appropriately set in consideration of various parameters. Examples of this temperature are 300 to 400 ° C. when the pest control component is permethrin, 200 to 300 ° C. when propoxel is used, and 250 to 350 ° C. when praretrin is used. The time to reach the temperature is within 5 minutes, preferably within 3 minutes.

  In this invention, as such temperature, 200-500 degreeC is preferable, More preferably, it is 250-400 degreeC. By setting to this temperature, decomposition of the active ingredient can be suppressed as much as possible, and an appropriate drug particle diameter can be obtained so that the evaporated active ingredient can be sufficiently diffused.

  In the present invention, heating may be performed to the above temperature within 5 minutes, and then heating may be continued, or heating may be stopped. In the present invention, the heating time is preferably within 5 minutes, more preferably within 3 minutes. This saves energy or material consumed by heating. Moreover, in this invention, even if it heats so that the said temperature may be reached within 5 minutes and the heating time is less than 5 minutes, a pest control component will fully and uniformly spread | diffuse in an application space. If the heating time is within 5 minutes, after the heating is stopped, the amount of the pest control component that has transpired in the air quickly decreases and the safety is high.

One example of a heating pattern when heated to the above temperature within 5 minutes is shown in FIG. In the graph of FIG. 1, 500 mg of permethrin and 400 mg of methoxadiazone were used as pest control components, and these acetone solutions were soaked in a cellulose fiber cylindrical filter paper and air-dried. It was mounted on a cylindrical electric heater (100 W) made of an aluminum tube (diameter 25 mm, length 80 mm) and heated. As the heating pattern, the pattern (a) shown in FIG. 1 (heating pattern of the present invention) was heated to 400 ° C. in 2 to 3 minutes. In the pattern (comparative example) of (b), the temperature was raised to 300 ° C. in 10 minutes to 12 minutes and the heating was continued up to 20 minutes. The temperature here is measured at the central portion of the outer surface of the aluminum tube. In the case of the pattern of FIG. 1 (a), for example, when permethrin and methoxadiazone are used as active ingredients, the effective amount of the pest control ingredient in air is 36 mg within 3 minutes at a heating temperature of 400 ° C. / M ³ , and the transpiration rate of the pest control component is maximized (5 mg / second or more when converted as an average transpiration rate from the start of heating to the end of heating). Further, the heating temperature of 400 ° C. in the case of including metoxadiazone only as an active ingredient, within 3 minutes, the effective amount in a gas of pest control component and 45 mg / m ^3. In the present invention, as a measure of the maximum transpiration rate of the pest control component that reaches within 5 minutes from the start of heating by heating, 1 to 100 mg / second is given as an average transpiration rate from the start of heating to the end of heating. be able to.

  Pest control components that can be used in the present invention include pyrethroid insecticides, oxadiazole compounds, organophosphorus insecticides, carbamate insecticides, and the like. Examples of the pyrethroid insecticide include framethrin, ciphenothrin, phenothrin, permethrin, resmethrin, allethrin, phthalthrin, empentrin, tefluthrin, praretrin, imiprothrin, transfluthrin, and the like. As the oxadiazole-based compound, for example, 3- (2-methoxyphenyl) -5-methoxy-1,3,4-oxadiazol-2 (3H) -one (generic name: methoxadiazone, trade name ELEMIC: Sumitomo Chemical Industries) (Manufactured by Co., Ltd.) can be representatively shown.

  Examples of the organophosphorus insecticide include fenitrothion, chlorpyrifos, marathon, dichlorvos, pyridafenthione, trichlorphone and the like. Examples of carbamate insecticides include carbaryl, benfuracarb, and propoxol. Examples of the compound (synergist) that enhances the insecticidal efficacy of the pyrethroid compound include piperonyl butoxide, octachlorodipropyl ether, N- (2-ethylhexyl) -1-isopropyl-4-methylbicyclo. [2,2,2] oct-5-ene-2,3-dicarboximide, isobornyl thiocyanoacetate and N- (2-ethynyl) -bicyclo [2,2,1] -hept-5-ene -2,3-dicarboximide and the like.

  In the present invention, other pest control components include, for example, hinoki, cedar and hiba essential oils, menthol, yellowfin extracts, citrus peel and seed extracts, aromatic sulfonamide derivatives, hydroxylated tricyclohexyl Tin, isopropyl 4,4′-dibromobenzylate, 2,3-dihydro-2,2-dimethyl-7-benzo [b] furanylni-N-dibutylaminothio-N-methylcarbamate, silane compound, cinnamic acid Derivatives, cinnamyl acetate, buflofezine, isoprothiolane, p-hydroxybenzoate, iodinated formal, phenols, phthalates, 3-bromo-2,3-iodo-2-propenyl-ethyl carbonate, monoterpene ketones, mono Terpene aldehydes, monoterpene epoxides, sari Le benzyl, and the like phenyl salicylate is.

  Other pest control ingredients include, for example, insect juvenile hormone agents such as hydroprene and metoprene, anti-juvenile hormone agents such as plecosene, pest hormone agents such as ecdysone and other molting hormone agents, or antihormones. Agents can also be mentioned.

  In the present invention, the form of the pest control component heated by the heating pattern is a system in which the pest control component is held in the substrate and heated.

  As the base material that can be used in the present invention, various commonly used materials such as felt, cotton, pulp, non-woven fabric, asbestos, ceramic, porcelain, earthenware, gypsum, bentonite, inorganic moldings, etc. But you can. Specific examples of the substrate include porcelain porous, glass fiber, asbestos and other inorganic fibers solidified with a binder such as gypsum and bentonite, kaolin, activated clay, talc, diatomaceous earth, clay, perlite, bentonite, A mineral powder such as alumina, silica, alumina silica, titania, vitreous volcanic rock calcined powder, vitreous volcanic ash calcined powder alone or with wood powder, charcoal powder, activated carbon, etc. Heated for several minutes at a temperature), added with a water-proofing agent such as melamine resin or ammonium dichromate to about 1 to 10%, or cross-linked starch, a mixture of this and α-starch, α- Examples include those solidified with a water-resistant binder such as a mixture of gluten and caprolactone. A synthetic resin-based binder can also be used.

  Among these, pulp or alumina ceramic is preferable as the substrate. Examples of the shape of the substrate include a plate shape, a cylindrical shape, a rod shape, and a honeycomb shape. The pest control component can be retained on the substrate by infiltrating the substrate with a solution obtained by dissolving the pest control component in a solvent and then drying the solution. Moreover, it can also carry out by mixing an inorganic salt or organic salt, and an active ingredient, and pressurizing to make a tablet. Solvents that can be used here include organic solvents such as low-boiling solvents such as acetone, alcohol and hexane, medium-boiling solvents having a boiling point of 100 to 300 ° C. such as n-paraffin, glycol and glycol ether, and phthalic acid. Examples thereof include fatty acid esters such as esters and isopropyl myristic acid esters, and inorganic solvents such as water.

As content of the pest control component in a base material, 0.1-10 g / 4-400 cm < ² > is preferable, More preferably, it is 0.5-5.0 g / 4-400 cm < ² >. Additives that may be contained in the base material in addition to the pest control component include synergists, dissolution aids, antioxidants, dyes, and the like as described above.

  The heating means is not particularly limited as long as the heat generation pattern can be obtained, and examples thereof include an electric heating method, an ignition method, and a chemical reactant method. The electric heating method is preferred. Specific examples of the electric heating means in the present invention include a ferrochrome wire, a nichrome wire, a positive temperature coefficient thermistor (PTC), a sheet heater, a heater using a semiconductor, and the like. In order to obtain the above-mentioned specific heating pattern of the present invention using these electric heating means, the heater having a power of 150 to 300 W is provided with a structure having a heat sink (foil) such as stainless steel. it can.

  The base material holding the pest control component can be heated directly or indirectly by the heating means.

  As an apparatus that can be used in the method of the present invention, any apparatus can be used as long as the heating pattern according to the present invention can be obtained. For example, FIG. An apparatus shown in A ′) shown in FIG. 3) can be exemplified. However, the contents of the present invention are not limited to these. FIG. 2 is a perspective view of the heater unit 7 and the case 3 of the heating device. FIG. 3 is a cross-sectional view of an apparatus in which the heater unit 7 is mounted on the case 3 with the holding component 5 and the base material 4 including a pest control component is further mounted. A band-shaped band heater 2 is provided at the lower end of the heat-dissipating metallic cylinder 1, and when the band heater 2 generates heat, the heat is transmitted to the heat-dissipating metal cylinder 1 and is radiated throughout the cylinder 1. The base material 4 containing a pest control component has a cylindrical shape and is open at the bottom, covers the outer periphery of the cylinder 1 (other than the part that enters the inside of the case 3), and the radiated heat is directly applied to the base material 4. It is in close contact with the cylinder 1 so as to be transmitted. The band heater 2 is connected to the temperature control board 6 and the thermistor 8, and feeds back the temperature information of the cylinder 1 detected by the thermistor 8 to the temperature control board 6. Control and adjust the temperature of the cylinder 1.

  Examples of the control target in the present invention include pests and indoor dust mites that live indoors and outdoors. Examples of pests that live indoors and outdoors include sanitary pests and living pests. For example, sanitary pests include cockroaches (such as cockroaches, black cockroaches, American cockroaches, etc.), flies (such as house flies, black flies, and flyflies), mosquitoes (such as house flies, crested mosquitoes, etc.), lice, fleas, etc. Living pests include termites (wing ants), black ants, spiders, bees, beetles, centipedes, gejigeji, millipede, scallops, scallops, chironomids, butterflies, stink bugs, bark beetles, damselfly, bark beetles, worms, moths, common moths, cutlet worms, etc. Can be illustrated. Furthermore, as indoor dust mites, mites that propagate and propagate indoors, or mites that enter the room, for example, mite mites such as leopard mites, mushroom mites, mite mites, mite mites such as mite mites, mite mites, mite mites, etc. , Mite mites such as larvae, mite mite, mite mites, mite mites, mite mites, mite mites, ticks, ticks, and animal parasitic mites.

The present invention will be described in more detail with reference to the following examples, but the present invention is not limited to these examples.
Example 1 The diffusibility of the active ingredient was evaluated.
(Test method) A stainless steel petri dish and a slit box (30 cm x 30 cm x 30 cm) were placed on the floor of a large chamber (3.6 m x 3.6 m x 2.7 m), and the active ingredients dropped and adhered after 2 hours. The amount was quantified.
(Location of petri dish)
(1) Floor: 1m from center (4)
(2) Floor: 2.4m (4) from the center
(3) Height 1m: 2.4m from center (4 pieces)
(Slit box location)
(4) Floor: 1m from center (4 pieces)
In addition, the said slit box assumes the condition where there are two 3 cm × 10 cm slits on the side surface and the drug is not directly exposed.

  The apparatus shown in FIG. 2 (the cross-sectional view of which is shown in FIG. 3) was installed at the above location. In addition, an acetone solution of 500 mg of permethrin and 400 mg of methoxadiazone as a pest control component is impregnated into a cellulose fiber cylindrical filter paper (diameter 28 mm, thickness 1.8 mm, length 80 mm) as a base material, and air-dried to provide a pest control component. The base material 4 containing was created. Here, the contents of permethrin and methoxadiazone in the cellulose fiber cylindrical filter paper are 500 mg and 400 mg, respectively. A cylinder made of an aluminum tube (diameter 25 mm, length 80 mm) as a cylinder 1 and mounted on an electric heater (100 W) as a band heater 2 was used. As the temperature rise pattern, the pattern of (a) shown in FIG. 1 (heated up to 400 ° C. in 2 to 3 minutes) and the pattern of (b) (heated up to 300 ° C. in 10 to 12 minutes and maintained up to 20 minutes) Both were carried out (details are as described above). Table 1 below shows the results of comparing the diffusivities of the active ingredients with different temperature rising patterns using the same apparatus as described above.

  From the results shown in Table 1 above, the temperature rising pattern (a) of the present invention has a large amount of falling active ingredients at each installation location compared to the temperature rising pattern (b) of the comparative example, and those drops. The difference between the maximum value and the minimum value of the adhesion amount was small. In particular, in a petri dish installed at 1 m from the center of the floor of the installation place (1), the difference between the maximum value and the minimum value of the drop adhesion amount was remarkably small compared to the temperature increase pattern (b). At a location 1 m from the center of the floor of the installation place (1), the active ingredient generally tends to increase, so that the active ingredient is difficult to adhere to. In fact, in the temperature rising pattern (b), there is a variation in the amount of the active ingredient attached at the installation location (1).

  Example 2 In order to evaluate the insecticidal effect, the following test was conducted. Evaluate the lethal effect of the above test insects in the slit box assuming the knockdown effect and lethal effect under open conditions in which test insects (german cockroaches and black cockroaches) are housed in a plastic cup, and the conditions where active ingredients are not easily exposed directly did. An open poly cup is installed at the four corners of the 8-tatami room (2.4m from the center of the floor), and a slit box (two 3cm x 10cm slits on the side) are installed at 1.0m from the center of the floor. Then, test insects were put in them, and the number of knockdowns from 2 hours after the start of heating was observed over time. Further, the test insects were taken out after 2 hours, and the number of lethality of the test insects after 24 hours was observed. These tests were performed on the temperature rising pattern (a) and the temperature rising pattern (b) using the same apparatus as in Example 1. The results are shown in Table 2 below.

  From the results of Table 2 above, the temperature rising pattern (a) of the present invention has a small KT50 and excellent immediate effect as compared with the temperature rising pattern (b). Furthermore, the fatality rate after 24 hours was 100%, which was a satisfactory level.

  According to the present invention, it is possible to provide an excellent pest control method that can effectively control pests existing in a human living space. Specifically, the present invention can provide a method capable of quickly and uniformly releasing a pest control component evaporated by heating into a space without smoke and effectively controlling the pest.

It is a figure which shows the temperature rising pattern of the method of this invention, and that of a comparative example. It is a perspective view which shows 1 aspect of the apparatus which can be used for the method of this invention. It is sectional drawing which shows 1 aspect of the apparatus which can be used for the method of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Metal cylinder for heat radiation 2 Band heater 3 Case 4 Base material containing a pest control component 5 Holding part 6 Temperature control board 7 Heater part 8 Thermistor

Claims (3)

  The pest control component held in the base material reaches a temperature at which the pest control component reaches an effective amount in the air and the transpiration rate of the pest control component reaches a maximum within 5 minutes from the start of heating by the heating means. A pest control method, comprising: heating to a temperature and evaporating the pest control component in the air to control the pest.   The pest control method according to claim 1, wherein the temperature is 200 ° C to 500 ° C.   The pest control method according to claim 1 or 2, wherein the heating time by the heating means is within 5 minutes.

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