WO2012090764A1 - Pest control method and water storage-drainage system equipped with control agent - Google Patents

Abstract

[Problem] To provide a method whereby pests laying eggs in water, for example mosquito larvae, can be easily and continuously controlled without causing environmental pollution, and a water storage-drainage system. [Solution] As the results of intensive studies to solve the aforesaid problem, the present inventors found that the growth of aquatic pests such as mosquito larvae can be inhibited and these pests can be controlled by placing a molded resin article, which contains a soluble glass capable of releasing silver ions in water with the passage of time or a silver-substituted inorganic ion exchanger, in a pool of water or an area where water likely pools, such a pool of water being a potential nursery of the aquatic pests, e.g., mosquito larvae, thereby completing the present invention.

Description

Pest control method and storage / drainage equipment with control agent

The present invention relates to a method for controlling pests in water, particularly boufra (mosquito larvae), using a soluble glass capable of eluting silver ions into water or a resin molded article containing a silver-substituted inorganic ion exchanger. Further, the present invention relates to a storage and drainage facility provided with a storage and drainage member such as a septic tank and a water storage tank provided in a side ditch as an embodiment of the control method.
Since the resin molding containing the soluble glass or silver-substituted inorganic ion exchanger used in the present invention can elute an appropriate amount of silver ions over time in water, the pest control method of the present invention is In addition, there is no fear of contamination by excessive metal ions, and it is a method capable of continuously controlling pests in water, and the storage and drainage equipment of the present invention is a facility that can efficiently carry out the above control method. is there.

The place where water stays, especially the storage and drainage facility, will be a place for spawning mosquitoes from spring to autumn, and will be a place for growth of boufra, that is, a place for mosquitoes. The occurrence of mosquitoes causes discomfort to the local residents and is known to mediate many infectious diseases such as West Nile fever, malaria, dengue fever, Japanese encephalitis, chikungunya, etc., which is not preferable for public health. In addition to mosquitoes, there are also known unpleasant insects that do not cause direct harm, such as those that stab livestock such as buoys, chironomids, and tobikelas, but clog the flow path when they occur in large quantities. Since all of these lay eggs in the water, before they grow and emerge, they are sprayed with insecticides in waterways, places where water stays, septic tanks and rainwater trouts, and are killed at the larval stage. However, the effect of the insecticide lasts only for a relatively short period of time, and when the drug flows out by running water, the effect cannot be sustained and also causes environmental pollution.

A number of prevention tools using metallic copper have been proposed for the suppression of the generation of underwater bow flares. For example, there is a proposal for an anti-bowler generation tool that places a copper plate having a thickness of 1.5 mm or less in water such as a rainwater trout (see Patent Document 1). There is also a proposal of a method of putting copper or tin in a spawning container and dying or suppressing the growth of mosquito larvae such as human striped mosquitoes in the container (see Patent Document 2). This proposal also mentions that copper is preferable as a dissolved ion source that exhibits a growth inhibitory effect, but tin or silver ions having a strong insecticidal effect may be used. However, there is no specific example regarding the effect of silver ions on the suppression of bowfura, and the effectiveness of silver ions has not been known.

Furthermore, there has been proposed an insecticidal sterilizer characterized in that a pipe made of copper or a copper alloy is housed in a container having a large number of communication holes (see Patent Document 3). Here, an electrolyzer for supplying silver ions, a sterilizing mat, a ball, and the like are also exemplified, but all relate to a sterilizing effect, and there is no description showing a bow ion suppressing effect of silver ions.

A plurality of examples have been disclosed regarding the effect of copper ions on suppressing the bowfra, but a high copper ion concentration is required in order to exhibit the effect of suppressing copper on copper ions. Leaking high concentration of copper ions into the environment is not preferable in terms of environmental burden, and the amount of copper discharged is regulated by environmental standard values. In addition, it is difficult to control copper ions to elute copper ions stably, and it is practically difficult to supply a copper ion concentration that is not excessive or insufficient. Silver ions are considered safer than copper because there is no environmental standard setting in Japan. However, since the ionization tendency is lower than copper, elution of silver ions from metallic silver is less likely to occur than copper ions. Since it is expected that a large amount of silver will be required to obtain a good effect, there has never been an attempt to use metallic silver for the control of pests such as boufra.

On the other hand, as a material that elutes antibacterial metal ions at a constant rate, glass containing antibacterial metals such as silver, copper, and zinc has been conventionally blended and used in resin compositions for various purposes ( For example, see Patent Documents 4 and 5). However, although these glassy antibacterial agents used by immersing in water have been confirmed to have an effect on bacteria and the like, there is no description regarding the effect of controlling pests such as boufra.
The concentration of silver ions necessary to develop antibacterial effects against microorganisms such as bacteria and moss is known, but it is effective against insects such as boufra, especially against effects that take effect over several days such as growth inhibition. There is no known literature on the effectiveness of silver ions and the required concentration of silver ions, and no specific examples have been studied.
In addition to this, as a water storage / drainage member for preventing the generation of mosquitoes by using a method of eluting antibacterial metal ions, rainwater containing a copper ion generating member is locked, which is disclosed in Patent Documents 6 and 7, for example. However, it has not been known that silver can be used.

JP 2008-38578 A JP-A-1-273534 JP 2001-69895 A JP 2004-262663 A Japanese Unexamined Patent Publication No. 01-313531 JP 2000-154589 A JP 2009-046861 A

An object of the present invention is to provide a control method for controlling pests that lay eggs in water, such as boufra (mosquito larvae), in a simple and sustainable manner that does not cause environmental pollution. An object of the present invention is to provide a storage / drainage facility equipped with a pest control agent and a storage / drainage member constituting the storage / drainage facility, which can carry out the above control method simply and continuously.

As a result of intensive studies to solve the above problems, the present inventors have developed a pest control agent using a soluble glass capable of eluting silver ions over time in water, or a resin molded article containing a silver-substituted inorganic ion exchanger. It has been found that it can be controlled and controlled by installing it in a puddle where aquatic pests such as bow flares are generated or where puddles are generated, and storage with these pest control agents is also found. The present invention was completed by finding drainage facilities and storage drainage members.

The pest control method of the present invention can be easily carried out by using silver glass that dissolves in water over time or a resin molded product kneaded with a silver-substituted inorganic ion exchanger as a pest control agent. The effect of continuously suppressing and controlling the growth of underwater pests such as boufras is obtained. As for the magnitude of the effect, the same level of effect can be obtained at a concentration lower than one-tenth of the copper ion as far as the concentration necessary for the effect of inhibiting the growth of boufra, compared to the conventionally known copper ion preparations. A large effect can be obtained with a smaller amount. Furthermore, since silver ions can be expected to have antibacterial, antifungal and antialgal effects, the water can be kept clean. In addition, the storage and drainage facility of the present invention is able to continuously suppress and control the growth of underwater pests such as bow flares that live in puddles generated in the facility, and keep the facility water clean. You can also. A bucket and rainwater as a storage / drainage member are examples of useful components of a storage / drainage system that exhibits the above effects.

It is a perspective view explaining the example of composition of the storage and drainage equipment of the present invention.

The present invention will be described below. In addition,% is the mass%. The unit liter of volume is also expressed as “L”.
○ Pests to be controlled The pests to be controlled in the present invention are insects that spawn or inhabit in the water and cause harm to humans. Chichaeka, Scutellaria, Tofukakuika, Anopheles, Aedes albopictus, Aedes albopictus, Aedes albopictus, Aedes aegypti Chironomid, chironomid chironomid, chironomid chironomid, lepidoptera, white-winged ephemera, white-tailed moth These include: Viquera, Nakaharashimatovicera, Murasakitobimushi, belonging to the order of Rhizobicidae, Fliesidae, Ashimadarabyu, Kiashiobyu, etc. In addition, algae, molds, fungi, and the like that are generated and attached to the water and the container wall can also be included.

Mosquitoes are particularly effective among the pests to be controlled. And the bowfra in the present invention is a mosquito larva. Mosquitoes grow by transformation of eggs, larvae, pupae and adults. Mosquito eggs are laid in water or at the water's edge, and then grow in water until they become adults. The period of growth in the water from the egg to the cocoon is about 10 to 20 days. Since the effect in the present invention is exhibited in water, the effect is exerted on eggs, larvae, and pupae that are mosquito forms that exist in water. The types of mosquitoes include the Anopheles subfamily such as Sinohada araka and Otsu hamada araka; Although it exists in Japan, since the kind of mosquito is not limited in the effect of the present invention, the same effect can be exerted against foreign mosquitoes.

In the present invention, the pest control effect means an effect of suppressing the growth of pests, for example, boufra, which means that the boufra does not become an adult mosquito, and only delays growth. Rather, it aims to die in the form of a boufra.
The place where a bow hula occurs is a pond, ground, stone, plant dent, bucket, fence, empty can, various containers, natural water pool due to rain or condensation on rainwater trout, etc., aquarium, artificial pond or pool, or water supply Various puddles such as puddles of water sprinkling and sewage accumulation are targeted. Although there is no restriction | limiting in the target place of the pest control method of this invention, Preferably the generation | occurrence | production place of these bow flares are object, and it is a puddle (water retention place) especially generate | occur | produced in a storage drainage facility.

As a result of examining the influence of the concentration of silver ions on growth inhibition of pests such as boufra, copper ions require a dissolution concentration of about 1 ppm, whereas silver ions require a concentration of 1 or less of several tens of minutes of copper ions. It has been found that even a dissolved concentration of about several tens of ppb exhibits a sufficient effect of suppressing the growth of boufra. However, the effect of suppressing the growth of the bowfla is not dependent only on the metal ion concentration, but also depends on the exposure time of the metal ions. In a low concentration of several tens of ppb, it takes several days, and in a high concentration of several ppm, it takes a short time. It becomes the action of. In general, since it is impossible to specify the date and time of occurrence of a bowfra, it is preferable to always supply a constant silver ion concentration in water when it is desired to suppress the bowfra.

○ Pest control agent The pest control agent in the present invention uses silver which is superior in safety and health to copper and can elute silver ions into water, and has a solubility containing silver. It is at least one selected from glass (also referred to as silver glass) and a resin molded body in which a silver-substituted inorganic ion exchanger is contained in a resin having an official moisture content of 1 to 10. Although there are some differences in constituent materials between soluble glass and resin moldings, both have the same effect of controlling pests by releasing a certain amount of silver ions in water for a long period of time. In addition, there is a common point in the elution rate of silver ions and the like, and the same can be used in the control method and storage / drainage equipment of the present invention.
It is preferable that the form of the resin molded body containing the soluble glass or the silver-substituted inorganic ion exchanger has a specific form in order to easily exhibit the growth inhibitory effect of the bowfra. For example, in order to exist stably in water for a long period of time, it is preferable that the drug does not flow out of the water pool due to wind and rain, but is submerged in water. It is preferable to be submerged in water. Specifically, the average mass per grain is preferably 0.5 g or more, and the specific gravity is preferably 1.05 or more, more preferably 1.2 or more and 5 or less. Specific gravity is defined by the mass ratio of a sample of the same volume and distilled water at 25 ° C. The particle diameter is, for example, the average of the maximum particle diameters of 50 control agents randomly selected regardless of the shape (for example, the diameter is a shape close to a sphere, the longest side length is a shape close to a rectangular parallelepiped). It can be represented by a value. Since the particles of the soluble glass or resin molded article of the pest control agent are too small to hold, it is essential that the particle size of the pest control agent in the present invention is 1 mm or more. . Considering the case where a water molded container or a water storage / drainage member is a resin molded body containing a silver-substituted inorganic ion exchanger, there is no particular upper limit on the size, but too large ones are difficult to mold, A preferable upper limit is 1 m, and a more preferable particle size is 2 mm or more and 100 mm or less.

In addition, pesticides such as resin moldings containing soluble glass or silver-substituted inorganic ion exchangers can be used for the first and subsequent times by replacing the elution amount of silver and water when first put into water after production. Are often different. These pest control agents in the present invention are preferably soluble glass whose silver elution amount when water is replaced is within ± 20% compared to the previous time. Moreover, even if there are fluctuations in water temperature and pH assumed for outdoor use, the silver elution amount does not change greatly, and it is preferably within ± 20%. In the comparison between the soluble glass and the resin molded body, there is no significant difference in the effect, but the soluble glass is preferable in that the weight loss is visibly easy to understand.

○ Dissolvable glass The soluble glass that can be used in the present invention has solubility in water, and the preferable dissolution concentration of silver ions in deionized water at 25 ° C is 0.05 mg / g · L · day or more. 5 mg / g · L · day or less. The soluble glass that can be used in the present invention is one whose water does not change greatly even if the water is changed or depending on the conditions such as temperature and pH, and it is sustainable even if the water is changed due to rain. is there.

Composition of soluble glass that can be used in the present invention, the Ag ₂ O 0.5 ~ 4 weight%, the K ₂ O or Na ₂ O 3 ~ 10 wt%, a SiO ₂ 0 ~ 60% by weight, B ₂ O ₃ or P ₂ O ₅ 40 to 70 _{wt%, Al 2 O 3, MgO} , BaO, at least one or more selected from the group consisting of ZnO containing 0-20%. Silver is a mosquito larvae suppressing active ingredient, Ag ₂ O in effect can not be obtained unless using large amounts soluble glass in the amount of 0.5% or less, 4% or more Ag ₂ O amount is vitrified Therefore, the Ag ₂ O content is 0.5 to 4% by mass, preferably 1 to 3%, more preferably 1.5 to 2.5%.

K ₂ O or Na ₂ O acting as a component for adjusting the solubility of the glass is easier to control the solubility of the glass for a long time than other alkali metals, and its content is preferably 3 to 10%, more preferably It is 4 to 9%, more preferably 5 to 8%. The more preferred among K ₂ O or Na ₂ O is K ₂ O, can be improved solubility than soluble glass Preference containing Na ₂ O, free of Na ₂ O , K ₂ O-containing soluble glass. SiO _2, P ₂ O ₅ and B ₂ O ₃ to form the skeletal structure of the glass, controls the solubility of the glass in the overall balance of the proportions, generally the solubility and the proportion of SiO ₂ is increased is reduced, B Solubility improves as the proportion of ₂ O ₃ increases. The preferred content of SiO ₂ is 0-60%, more preferably 0-15%. A preferable content of B ₂ O ₃ is 42 to 70%, more preferably 44 to 67, and particularly preferably 44 to 65%. Al ₂ O ₃ forms the skeleton of glass with SiO ₂ or B ₂ O _3, the inclusion of Al ₂ O ₃ generally chemical durability improved when SiO ₂ or B ₂ O ₃ is the main component Therefore, it is preferable to contain. However, if the content is too large, the solubility of the glass becomes too small to make it difficult to exhibit the effect of suppressing the growth of bowflas. Therefore, the preferred content is 5% to 20%, more preferably 15 to 20%.

Other MgO, BaO, and ZnO are not essential components because they enter between the glass skeleton components and have the effect of stabilizing the glass. The preferred content is 0 to 10%. Even if Ca, Ba, Zn, Co, Cu and the like are mixed as other components, the amount of the glass may be small so as not to affect the long term.

In general, an inexpensive industrial method for producing granular glass is to add hot liquid glass that has been heated and melted into water and rapidly cool it to form an irregularly shaped cullet, or pass between metal rollers to form a plate (flakes). It is a method to do. However, cullet is difficult to adjust the particle size and needs to be pulverized or classified because it contains fine particles or coarse particles of 2 mm or less. Further, since there are residual stresses on the surface, fine cracks are likely to occur, and crushing proceeds from the crack portion during use, so fragments and fine powder are generated, and the particle size is likely to change. On the other hand, flakes tend to have a certain particle size than cullet, but that is not sufficient, and there are many broken pieces of glass plate, which may be dangerous to use. By application of the method for producing flake glass, the melted antibacterial glass for water treatment is molded with a cooling roller having a hemispherical or conical depression on one or both sides, thereby forming a hemispherical, conical or spherical shape. Granular glass can also be produced. By setting it as such a molded article, it is hard to break and it becomes easy to control solubility by realizing a certain shape and particle size.

The manufacturing method of the soluble glass used in the present invention is a predetermined mixed amount of a compound containing necessary components such as oxides, hydroxides, borates, chlorides, nitrates, sulfates and carbonates. After mixing well, it can be obtained by heating and melting in a melting pot and quenching.

The soluble glass obtained in this way is excellent in controlling the amount of elution of silver by adjusting the solubility, shape, and particle size. The inhibitory effect is expressed. Moreover, since the soluble glass itself dissolves and loses weight, the duration of the effect of suppressing the bow fluff can be easily seen by anyone. Those in which the soluble glass is colored are preferred because they are easily visible. The silver elution amount when the soluble glass capable of eluting silver ions in water in the present invention is immersed in water can be adjusted by the glass composition and the surface area of the molded body, and is 0.05 mg / g · L. · Preferably, it is not less than 5 mg / g · L · day and more preferably not less than 0.1 mg / g · L · day and not more than 0.5 mg / g · L · day. It is preferable that the dissolution amount in this range be maintained for 3 weeks or more, and for several months if possible. Estimated amount of soluble glass for realizing silver ion elution amount above, the volume per liter of water soluble glass is immersed, a 3 cm ² ~ 500 cm ² as the sum of the surface area of soluble glass An amount is preferable, and an amount of 50 cm ² to 300 cm ² is more preferable.

The specific surface area of soluble glass is preferably 3 ~ 500cm ² / g, more preferably 5 ~ 200cm ² / g, more preferably 10 ~ 50cm ² / g. As an example of a shape having a specific surface area of 3 to 50 cm ² / g, a spherical particle has a radius of about 0.05 to 1 cm. A specific surface area of 3 cm ² / g is less than a (if the particle size is too large) slows dissolution rate of silver, the effective require more amount of control agent required for the control. When the specific surface area is larger than 500 cm ² / g (if the particle size is too small), the elution rate of silver is too fast and the control agent is consumed in a short period of time, so that the control effect may be insufficiently sustained.

The form of use of the soluble glass that can be used in the present invention is not particularly limited, and can be used in the form of granules. For example, several g to several tens of g are filled and packed in a nonwoven fabric or net. It is also possible. It is more preferable that the packing is made of a nonwoven fabric and a net. The inside of the double packaging should be a fine nonwoven fabric to prevent leakage of soluble glass, and the outside should maintain the strength of the nonwoven fabric. Therefore, it is preferable to have a net shape that is strong and easy to pass water. As the material of the inner nonwoven fabric, it is preferable to use a hydrophilic material because glass is easily dissolved, and examples thereof include nylon and polyester. Further, it is possible to store the soluble glass in a plastic container having holes or slits. It is also a preferable form that the soluble glass packed with a nonwoven fabric is stored in a plastic container so that it can be taken in and out.

Resin molded body containing silver-substituted inorganic ion exchanger The resin molded body containing a silver-substituted inorganic ion exchanger in the present invention is preferably a silver-substituted inorganic ion exchanger in a resin having an official moisture content of 1% or more and 10% or less. Is a molded article made of a resin composition kneaded in an amount of 1 to 30% by mass.
The silver-substituted inorganic ion exchanger is an inorganic cation exchanger powder obtained by ion exchange of silver. The silver content is 1% or more and 20% or less, more preferably 2% or more and 15% or less. If the silver content is 1% or less, the effect of inhibiting the growth of bowfra is difficult to develop, and it is difficult to substitute 20% or more of the inorganic ion exchanger with silver. Examples of inorganic cation exchangers include zeolite, zirconium phosphate, and titanium phosphate. In particular, the zirconium phosphate represented by the following formula [1] is effective because it can stably ion-support silver at a high concentration. .
M _a Zr _b Hf _c (PO ₄ ) ₃ · nH ₂ O [1]
In the above formula [1], M is at least one ion selected from alkali metal ions, alkaline earth metal ions, ammonium ions, hydrogen ions and oxonium ions, and a, b and c are 1.75 < When b + c <2.25 and M is monovalent, it is a number satisfying a + 4 (b + c) = 9, and when M is divalent, it is a number satisfying 2a + 4 (b + c) = 9, and a, b and c is a positive number, and n is a positive number of 0 or 2 or less

A molded article of a resin composition can be easily obtained by blending the silver-substituted inorganic ion exchanger of the present invention with a resin. Any known method can be adopted as a method for processing the resin molded body. For example, (1) using an additive for facilitating adhesion between the silver-substituted inorganic ion exchanger powder and the resin or a dispersant for improving the dispersibility of the silver-substituted inorganic ion exchanger powder, (2) A method of directly mixing a powdered resin with a mixer, (2) A method of mixing as described above, forming into a pellet shape with an extrusion molding machine, and then blending the molded product into the pellet-shaped resin, (3) A method in which the silver-substituted inorganic ion exchanger powder is molded into a high-concentration pellet using wax, and then the pellet-shaped molded product is blended into a pellet-shaped resin. (4) The silver-substituted inorganic ion exchanger powder is polyol, etc. There is a method of preparing a paste-like composition dispersed and mixed in a high-viscosity liquid material and then blending this paste into a pellet-like resin.

There is no limitation on the molding machine for processing the resin molding containing the silver-substituted inorganic ion exchanger in the present invention, and an existing machine can be used. For example, an injection molding machine, an extrusion molding machine, blow molding, a heat press, etc. are illustrated. Among these, an injection molding machine is preferable because it has a small thermal history in addition to the stability of the shape. This is because if the thermal history is large, the deterioration of the resin progresses, so that decomposition components of the resin other than silver may be dissolved in water. Examples of the mixer that can be used for producing the composition before molding include a kneader, an extrusion molding machine, and a mixing roll.

The official moisture content of the resin used for the resin molded body in the present invention is an index indicating the moisture absorption rate of the resin determined based on the moisture absorption rate at a temperature of 20 ° C. and a relative humidity of 65%. The official moisture content of the resin used in the present invention is 1.0 or more and 10 or less, preferably 2 or more and 9 or less, more preferably 3 or more and 8.5 or less. If the official moisture content is 1 or less, sufficient persistence of silver elution of the resin molded product is not obtained, and if it is 10% or more, elution takes place in a short time, it is difficult to control the silver concentration, and the product value is reduced in appearance due to easy discoloration. There is also a risk.

As the official moisture content of general resins, polypropylene 0.0, polyethylene 0.0, vinyl chloride 0.0, vinylidene 0.0, polyester 0.3-0.4, urethane 1, acrylic 1.2-2. 0, polyacetal 2.0, polyamide 3.5-5.0, acetate 6-7, rayon 12-14, and the most preferred resin from the value of official moisture content is polyamide. Polyamide is generally called nylon, and there are nylon 6, 66, 46, MDX6, 61, 9T, 610, 612, 11, 12, etc., and these can be used alone or in combination. . Furthermore, since it is desirable to submerge it in water, the specific gravity of the resin is preferably 1.1 or more. Since the specific gravity of polyamide is about 1.15, polyamide is preferable also in specific gravity. Among these, 6 nylon is particularly preferable from the viewpoint of versatility, moldability, controllability of silver elution amount, etc., and it can be used by mixing with other types of nylon. A compounding rate is preferable. Further, among the 6 nylons, those having a low density are preferable because they are more easily eluted.

A dispersant such as metal soap can be used for the resin molded body containing the silver-substituted inorganic ion exchanger in the present invention. A preferred dispersant is a metal soap, such as zinc stearate, calcium stearate, magnesium stearate, and more preferably magnesium stearate.

The silver-substituted inorganic ion exchanger used in the resin molded body containing the silver-substituted inorganic ion exchanger in the present invention has various additives as necessary in order to improve kneading into the resin and other physical properties. Can also be mixed. Specific examples include pigments such as zinc oxide and titanium oxide, inorganic ion exchangers such as zirconium phosphate and zeolite, dyes, antioxidants, light stabilizers, weather stabilizers, flame retardants, antistatic agents, foaming agents, Lubricants such as impact strengthening agents, glass fibers, metal soaps, moisture-proofing agents and extenders, coupling agents, nucleating agents, fluidity improvers, deodorants, wood powder, antifungal agents, antifouling agents, antirust agents, There are metal powders, UV absorbers, UV screening agents, etc.

In the resin molding containing the silver-substituted inorganic ion exchanger in the present invention, any known processing technique and machine can be used according to the characteristics of various resins, and heating, pressurizing, or depressurizing at an appropriate temperature or pressure. However, it can be easily prepared by a method of mixing, mixing or kneading, and their specific operation may be performed by a conventional method. The shape is not limited, and can be formed into various forms such as a spherical shape, a lump shape, a sponge shape, a film shape, a plate shape, a thread shape, a pipe shape, or a composite thereof, and can be appropriately designed according to the application. it can.

The resin molded body containing the silver-substituted inorganic ion exchanger thus obtained can control the silver elution amount by adjusting the solubility, shape and particle size. When immersed in water in an appropriate amount, the silver concentration in the water is eluted over time, and the growth inhibitory effect of boufra is expressed. The silver elution amount when the resin molded body capable of eluting silver ions in water in the present invention is immersed in water can be adjusted by the composition of the molded body and the surface area of the molded body, and 0.05 mg / g. · L · day to 5 mg / g · L · day is preferred, more preferably 0.1 mg / g · L · day to 0.5 mg / g · L · day. It is preferable that the dissolution amount in this range be maintained for 3 weeks or more, and for several months if possible.
Estimated amount of resin molding for realizing silver ion elution amount above, the volume per liter of water which the resin molded article is immersed, the amount to be 3 cm ² ~ 500 cm ² as the surface area of the resin molding An amount of 50 cm ² to 300 cm ² is more preferable.

The specific surface area of the resin molded body is preferably 3 ~ 500cm ² / g, more preferably 5 ~ 200cm ² / g, more preferably 10 ~ 50cm ² / g. As an example of a shape having a specific surface area of 3 to 50 cm ² / g, a spherical particle has a radius of about 0.05 to 1 cm. As an example of another shape, if the plate is 10 cm square, the average thickness is about 0.3 to 6 mm. When the specific surface area is less than 3 cm ² / g, the elution rate of silver becomes slow, and a large amount of a control agent required for effective control is required. When the specific surface area is larger than 500 cm ² / g, the elution rate of silver is too fast and the control agent is consumed in a short period of time, so the sustainability of the control effect may be insufficient.

The usage form of the resin molded body containing the silver-substituted inorganic ion exchanger in the present invention is not particularly limited, and the molded body can be used as it is. You may pack in a nonwoven fabric etc., and you may fill a cartridge-like container. It can be used by immersing or passing it in the water to be treated, and does not need to be always present in water. Even if it is once dried in air, its performance does not change greatly if it is returned to water again. What is necessary is just to adjust the standard of usage-amount suitably with the amount of silver substitution, and the target effect.

○ Usage method The method for suppressing the growth of pests such as boufra in the present invention is likely to generate pests such as boufra when water is accumulated in a resin molded product containing soluble glass or a silver-substituted inorganic ion exchanger. It can be applied by installing it in a pit with a pit or actually a puddle, or a puddle where pests such as boufras are already generated. The amount used is about 1 g per liter, but can be appropriately prepared in consideration of the lifetime. When the control agent is used in water with no water in and out, it can be expected that a control effect will appear if the silver ion concentration in the gradually eluted water is 10 ppb or more, calculated from the silver content of the control agent. In a real environment where water pests are a problem, it is difficult to imagine a situation where there is no water access. In this case, it is preferable to elute silver at a rate sufficient to catch up with the growth rate of pests even when water enters and exits, and for long-term control with as little control agent as possible for economic reasons. In this sense, the amount of the control agent to be added is preferably determined so that the silver elution concentration in water is 50 ppb / day or more and 5 ppm / day with respect to a fixed volume of water. . Specifically, if the elution amount of silver from the control agent is 0.1 (mg / L · g · day), the elution concentration of silver in an aqueous system with a volume of 1 L is from 50 ppb / day to 5 ppm / day. The amount of the control agent to be added is calculated to be 0.5 g to 50 g and can be used as a guide for the amount used in this way, but the amount used can be appropriately adjusted while observing the actual effect.
It is also preferable to use a combination of multiple types of pest control agents with different silver elution amounts, a control agent that elutes in a short period of time and exhibits an early control effect, and a control agent that gradually elutes and maintains a control effect over a long period of time By using together, the control can be made more effective.

○ Applications Examples of the occurrence of pests such as bow flares, which are specific uses of the pest control method of the present invention, include pools, ponds, the ground, stones, plant depressions, buckets, empty cans, various containers, rainwater trouts, etc. Various puddles such as a puddle from natural water puddles due to rain and dew condensation, water pours from tap water, etc., and sewage stagnation are targeted. The effect of suppressing the growth of the bowfra of the present invention is intended for any place where a bowfra is generated. Specific examples of the pest control method of the present invention include rainwater troughs, rainwater infiltration troughs, rainwater storage tanks, rainwater manholes, side grooves, troughs provided in side grooves, and septic tanks. These members may retain water for several days or more, and it is intended by the present invention to control pests that are generated and live in the retained water. The material of the water storage / drainage member is not limited to plastics such as polyvinyl chloride and polypropylene, concrete, and pottery. The water storage / drainage member may be made of a resin containing a silver-substituted inorganic ion exchanger.

○ Rainwater Masashi Rainwater Mas is a typical storage and drainage member in the present invention. The rainwater usually has a muddy part at the bottom. Often, water stays in the mud pool for days, creating pests and habitats. Many plastic storm drains are equipped with a bucket that can collect the muddy water staying in the mud pool for easy cleaning. Occurrence and habitat. A rainwater basin having a handle and a bucket that is easy to remove from and into the stormwater is particularly preferred.
The shape of the bucket is generally cylindrical and the bottom is slightly smaller in diameter than the top, but is not limited to this. The bucket may have a hole or a slit.

○ Storage / drainage facility The storage / drainage facility of the present invention includes the pest control agent and the storage / drainage member. When the pest control agent is granular, it is preferably stored and used in a pest control agent storage container. The pest control container is a container that can freely enter and leave the water and can release silver ions eluted from the pest control agent but prevent the pest control agent itself from flowing out. Several forms of the pest control container are illustrated.
(1) Non-woven bag-like container (2) Multi-layer container consisting of non-woven inner bag and open net outer bag (3) Plastic with one or more fine holes or narrow slits (4) Plastic container of “(3)” with non-woven inner bag The pest control container may be a disposable one that is discarded when the pest control agent is no longer consumed, or a pest The refillable thing which can replenish a control agent may be used. When the pest control agent is no longer consumed, the inner bag made of nonwoven fabric may be replaced with a new one in the above “(4)”. Examples of the plastic include polyethylene, polypropylene, polyvinyl chloride, polystyrene, polycarbonate, polyester, and ABS.

The pest control agent storage container is preferably locked to the water storage / drainage member. The pesticide storage container may be directly locked to a storage and drainage member such as rainwater, or may be locked to a muddy water recovery bucket attached to the rainwater.
A storage / drainage facility in which a pesticide storage container is detachably locked to a storage / drainage member is preferable because it is easy to maintain. The pesticide storage container may have a structure that is directly locked to the storage / drainage member or its accessory member, or a locking member such as a thread, string, rope, chain, wire, clip, nail, bolt, etc. It may be a structure which is locked via.

A rainwater basin equipped with a bucket for collecting muddy water, in which a pesticide storage container is detachably locked, is particularly preferable because of easy maintenance. Several forms in which a pest control agent storage container is detachably locked to a bucket are illustrated. A plurality of pesticide storage containers may be locked in one or more forms. For example, by combining the following (3) and (4), even when the water stays in the bucket, mud accumulates in the bucket and the water stays at a position exceeding the height of the bucket But it can effectively control pests.
(1) The pesticide storage container is locked to the back surface of the bottom of the bucket.
(2) Lock the pesticide storage container on the bottom surface of the bucket.
(3) Lock the pesticide storage container on the inner surface of the cylindrical portion of the bucket.
(4) The pesticide storage container is suspended from the handle portion of the bucket.

<Action>
Silver ions have an effect of suppressing the growth of boufra at a low concentration of several tens of copper ions. In order to continuously suppress bow flares that occur mainly in outdoor puddles, forms that do not run out, durability against acid rain, ultraviolet rays, etc., and sustainability that continuously develops silver solubility even when water is replaced. It can not be used unless it has. The pest control method of the present invention suppresses the outflow by adjusting the particle size and specific gravity, is excellent in durability, and further continues to elute silver ions continuously, thus showing the growth inhibitory effect of boufra over a long period of time, Reduces the occurrence of mosquitoes.

EXAMPLES Hereinafter, although an Example demonstrates this invention, this invention is not limited to this.
The elution amount of silver or copper ions was determined by adding 1 g of the sample to 1 L of deionized water at 25 ° C., and storing it for 24 hours, and then determining the concentration of silver or copper ions in the water by ICP (inductively coupled plasma emission spectrometer, Specifically, it was measured by Seiko Denshi Kogyo Co., Ltd. SPS7700 type), normalized to 1 g of sample, 1 liter of elution water and concentration per day, and displayed as elution amount (mg / g · L · day).

<Reference example>
Table 1 shows the details of Samples 1 to 13 used in the tests in Examples and Comparative Examples.
The meltable glass of Samples 1, 2, 5 to 9 shown in Table 1 is a metal cooling molding roller in which a glass raw material preparation is heated and melted at 1200 ° C., and a hemispherical depression having a diameter of 5 mm is arranged on one side. The resulting glass was cooled and molded, and the obtained glass was crushed and crushed, and further dry-crushed with a ball mill for 1 hour, followed by pulverizing fine powder with a metal mesh having an opening of 2.8 mm. Sample 5 was obtained by further pulverizing Sample 2 obtained using a ball mill.

The silver-substituted inorganic ion exchangers used for Samples 3, 4, 10, and 11 shown in Table 1 are obtained by adding 10% of powdered zirconium phosphate or zeolite A to ion-exchanged water, On the other hand, silver substitution was performed by adding an aqueous silver nitrate solution to 11% with silver and stirring for 1 hour. Thereafter, the silver-substituted inorganic ion exchanger used in Samples 3, 4, 10, and 11 was obtained by filtration, washing with ion-exchanged water, drying at high temperature, and pulverizing. The composition of the silver-substituted zirconium phosphate is Ag _0.45 Na _0.47 H _0.2 Zr _1.95 Hf _0.02 (PO ₄ ) ₃ · 0.05H ₂ O, and the silver-substituted zeolite is 0.15 Ag ₂ O · 0.85Na ₂ O · Al. _{It was 2} O ₃ .2.03SiO ₂ .0.7H ₂ O. The glass composition is shown in Table 1 because the soluble glass has greatly different properties such as solubility depending on the composition. In addition, the soluble glass which elutes silver ions is called silver glass, and the soluble glass which elutes copper is called copper glass. Samples 3, 4, 8, and 10 were obtained by mixing the obtained soluble glass or silver-substituted inorganic ion exchanger powder with nylon or polyethylene resin powder, and then molding it with an extrusion molding machine. Cut to create. As the silver nitrate of Sample 12, a plate crystal reagent was used.

The numbers in parentheses in the component composition formulas indicate the mass fraction (%) of each constituent element unit.

Table 2 shows the metal content (%), particle size (mm or μm), specific gravity, and metal elution amount (mg / g · L · day) of Samples 1 to 13. The particle diameter indicates an average value of the maximum particle diameters of 50 particles randomly selected regardless of the shape. However, Sample No. About 5 and 11, since it was too small and it was difficult to select and measure particles, volume-based median diameters measured with a laser diffraction particle size meter (Malvern Master Sizer 2000) were used.

<Cutting test of bow-flas>
100 mL of commercially available mineral water was put into a polycup, and samples of various control materials shown in Reference Examples were added in the amounts shown in Table 3, respectively. Ten 1-year-old larvae 3 hours after hatching of Aedes albopictus were put into each aqueous solution. The test polycup was placed in a black container and stored in the dark at 26 to 27 ° C. The results of measuring the number of dead insects after 5 days are shown in Table 3. After the test, 100 ml of commercially available mineral water was added, and water was partially replaced by overflowing water from the container. In some samples, it was confirmed that the sample leaked out of the container due to the overflow of water from the container in this operation, but the leakage was not prevented and left as it was. Table 3 shows the results of carrying out this water exchange test once a day and carrying out a test in which a bowfra was added again after 10 times in total. In addition, the test which does not put a sample was done similarly, and it was set as the comparative example 9.

The run after 10 times shown in Table 3 shows the result of the test in which the water exchange test was performed once a day, and after 10 times in total, the bow-flas were added again.

In Examples 1 to 4, the effect of suppressing the growth of boufra was extremely high even at the initial stage and after water replacement. The copper glass of Comparative Examples 2 and 3 and the copper plate of Comparative Example 8 were low in the effect of suppressing the growth of bow flares even when the elution concentration itself was set higher than that of silver. Further, Comparative Examples 1, 4, 6, and 7 that do not sink in powder form or water are not low in initial effect, but the effect after 10 times of water replacement is remarkably lowered, and a sustained effect cannot be obtained.

Regarding Comparative Examples 4 and 5 using a control agent comprising a molded product in which an active ingredient is dispersed in polyethylene having an official moisture content of less than 1, the phenomenon in which the effect after water replacement 10 times lower than the initial level is the surface of the molded product It is inferred that silver, which is an active ingredient in the vicinity, is consumed in the initial stage, and that the silver inside the molded body is also difficult to use effectively due to the hydrophobicity (low official moisture content) of polyethylene as a dispersion medium. Is done. Regarding Examples 3 and 4 using a control agent made of a molded product in which an active ingredient is dispersed in nylon having an official moisture content in the range of 1 to 10, the phenomenon in which the control effect was maintained after 10 times of water replacement was Even if silver, which is an active ingredient near the body surface, is consumed at the initial stage, it is also affected by the fact that silver inside the molded body is easily used effectively due to the hydrophilicity (high official moisture content) of nylon, which is a dispersion medium. It is inferred that

<Example 6> On-site test of generation of bow flares using rainwater trough A test facility shown in Fig. 1 was prepared as a model of a storage and drainage facility. The handle 3 of the bucket 1 (capacity 2 liters) attached to the rainwater masu 4 contains 5 g of the sample 1 as the pest control agent 7, and the pest control storage container 8 made of a nylon nonwoven fabric is used as a locking thread. 9 was hung. For comparison, a test facility was also prepared in which an empty pesticide storage container without a pest control agent was suspended.

Approx. 2 liters of water was put into the above bucket 1 and attached to a rainwater basin installed in the shade outdoors. The rain caused storage water to flow out and foreign matter, but it was left outdoors for about 3 months. As a result of observing the occurrence of a bowler in the bucket once every two weeks in three months, the occurrence of a bowler was confirmed three times in a bucket not using the sample 1, but the occurrence of a bowler was 1 in the bucket containing the sample 1. I could not confirm it again.

The control method of the present invention and the storage and drainage equipment equipped with the control agent can control pests that are generated and inhabit in the water staying in the storage and drainage equipment, and thus ensure a sanitary living environment for human livestock. Can prevent pest-borne infectious diseases.

DESCRIPTION OF SYMBOLS 1 Bucket 2 Bucket main body 3 Handle 4 Rainwater masu 5 Mass main body 6 Inspection cylinder 7 Pest control agent 8 Pest control agent storage container 9 Locking member

Claims (14)

1. The pest control agent is selected from a soluble glass that can elute silver ions into water, or a resin molded product containing a silver-substituted inorganic ion exchanger in a resin having an official moisture content of 1 to 10. A pest control method for controlling pests in water by bringing a pest control agent having a particle diameter of 1 mm or more into contact with water.
2. The method for controlling pests according to claim 1, wherein the amount of silver elution into the water from the pest control agent is 0.05 mg / g · L · day or more and 5 mg / g · L · day or less.
3. The pest control method according to claim 1 or 2, wherein the silver elution concentration in water is 50 ppb / day or more and 5 ppm / day or less.
4. The pest control method according to any one of claims 1 to 3, wherein the pest control agent is submerged in water, and the pest control agent in the water is controlled by introducing the pest control agent into the water.
5. The pest according to any one of claims 1 to 4, wherein the pest control agent is a granule or a molded article having a specific gravity of 1.05 to 5 and a specific surface area of 3 cm ² / g to 500 cm ² / g. Control method.
6. The method for controlling pests according to any one of claims 1 to 5, wherein the pests in the water are boufra.
7. A storage and drainage facility comprising a storage and drainage member using the pest control method according to any one of claims 1 to 6.
8. Silver ions eluted into the water from the pest control agent are free to enter and exit, but a pest control agent storage container that can hold the pest control agent so that it does not flow out is provided, and the pest control agent is harmful The storage and drainage facility according to claim 7, which is stored in a biocontrol agent storage container.
9. The storage and drainage facility according to claim 8, wherein the pest control agent storage container has a structure capable of replacing or replenishing the pest control agent.
10. 10. The storage / drainage facility according to claim 8 or 9, wherein the pest control container is detachably locked to the storage / drainage member.
11. The storage and drainage facility according to any one of claims 7 to 10, wherein the storage and drainage member is rainwater.
12. The rainwater masu is equipped with a stagnant discharge bucket that collects at the bottom,
    The storage / drainage facility according to claim 11, wherein the pesticide storage container is detachably locked to the bucket.
13. The bucket used for the storage and drainage facility according to claim 12, wherein the pesticide storage container can be detachably locked.
14. It is provided with the bucket according to claim 13, and rainwater used in the storage and drainage facility according to claim 12.
    
    
    

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