JP4192221B2 - Foaming aerosol for pest control - Google Patents

Description

上記混合液９３重量％に対し液化石油ガス７重量％を加えエアゾール容器（容量３００ｍｌ）に充填した。
実施例２
微粉化ケイ酸を５．０重量％及び精製水を５３．８重量％用いた以外は実施例１と同様にしてエアゾール容器に充填した。
比較例
微粉化ケイ酸を配合せず、精製水を５８．８重量％を用いた以外は実施例１、２と同様にしてエアゾール容器に充填した。
（アリに対するバリアー試験）
庭土又は砂を厚さ約５ｃｍに敷き詰め、その表面にエアゾール約０．８ｇを直径約７ｃｍ、幅及び高さ約２ｃｍの環状にスプレーし薬剤を塗布した。白熱灯下ドライヤーにて乾燥・消泡し、その直後及び一晩放置後、環の内側にヤマトアシナガアリを放ち、自力で環外に脱出したものを捕獲して別の容器に入れ、ノックダウン状況を観察した。
【００１６】
【表１】

【００１７】
（アリに対する限定時間接触試験）
直径１０ｃｍのペーパータオル上に、エアゾール約０．２４ｇをスプレーして薬剤を均一に塗布し、白熱灯下で加温して消泡・乾燥後、薬剤塗布部にヤマトアシナガアリ１０匹を1分間接触させた。接触後、別の容器に移し、ノックダウン状況を観察した。
【００１８】
【表２】

【００１９】
試験の結果、本発明の微粉末含有発泡エアゾール殺虫剤は、消泡・乾燥直後のみならず、消泡・乾燥後一晩放置した状態においても優れたノックダウン効果を示したことから、極めて効率的・実用的な発泡塗布方式を提供することが認められた。これに対し、比較例で示されるように、微粉末を配合しない場合は、消泡・乾燥直後、一晩放置後ともに、ノックダウン効果は明らかに低かった。
【００２０】
【発明の効果】
本発明は、直接噴射や噴射直後のみならず、塗布後時間が経過して消泡・乾燥した状態においても優れた殺虫効果を示し、また塗布の状態も良好で、アリやゴキブリ等の大小様々な匍匐害虫駆除用に供される従来の発泡性エアゾール殺虫剤においていまだ十分に果たし得なかった効力の増強及び効力の持続などの要求を満足する新しい微粉末含有発泡性エアゾール殺虫剤これを用いた殺虫成分塗布方法を提供するものである。[0001]
[Industrial application fields]
The present invention relates to an effervescent aerosol insecticide suitable for controlling large and small insect pests such as ants and cockroaches, and an insecticidal component coating method using the same.
[0002]
[Prior art]
As one of the methods for controlling moth pests, a method of spraying an insecticide together with a foaming component has been known. This is usually achieved by dissolving or dispersing an insecticidal active ingredient in an appropriate solvent, enclosing it in a sealed container together with an appropriate foaming component such as a surfactant and an appropriate pressure source such as liquefied petroleum gas, and the insecticidal active ingredient from a nozzle. Is sprayed in the form of foam and applied directly to the pest body or indirectly to the pest nesting or passage. This method has advantages such as less risk of inhalation by attaching to the human body and breathing compared to simple aerosols, but in particular in the case of indirect application, the efficacy and duration of the insecticidal component keeps bubbles. It tends to depend on time, and after the disappearance of bubbles, the efficacy of the insecticidal component is remarkably reduced, and a sufficient insecticidal effect over a long time cannot be expected.
[0003]
[Problems to be solved by the invention]
The present invention is a new foam that satisfies the demands such as enhanced efficacy and sustained efficacy that could not be sufficiently achieved with conventional foaming aerosol pesticides used for extermination of various pests such as ants and cockroaches. An object is to provide a sex aerosol insecticide.
[0004]
[Means for Solving the Problems]
The present inventor discovered that the above object can be achieved by adding a specific fine powder component in a conventional foaming insecticide for pest control, and completed the present invention. That is, the present invention
(I) Insecticidal component 0.01-10.0% by weight,
(B) Lower alcohol 5.0-40.0% by weight,
(C) Nonionic surfactant 0.5-10.0% by weight,
(D) Thickener 0.1-7.5% by weight,
(E) a fine powder insoluble or hardly soluble in water and lower alcohol, preferably 0.5-20.0% by weight of a fine powder of silicic acid having an average particle size of 1-50 μm,
(F) 30.0-90.0% by weight of water,
An aerosol solution containing 70 to 98% by weight of an insecticide stock solution containing 2 to 30% by weight and an aerosol container filled with an inner solution containing 2 to 30% by weight of a propellant. And an insecticidal component coating method using the same.
[0005]
Examples of the insecticidal component used in the present invention include pyrethroid insecticides, pyrethroid-like insecticides, organophosphorus agents, carbamate agents, insect growth disruptors, etc., but pyrethroid insecticides from the standpoint of efficacy and safety Or a carbamate agent is preferable. Examples of pyrethroid insecticides include transfluthrin, allethrin, praretrin, phenothrin, tetramethrin, imiprothrin, cyphenothrin, fenvalate, permethrin, cypermethrin, etofenprox, cyfluthrin, bifenthrin, and the like, and carbamate agents such as propoxol. However, the present invention is not limited thereto, and when there are optical isomers or geometric isomers, it is needless to say that each of them and any mixture thereof are included. In the present invention, one or more of these insecticidal components are 0.01-10% by weight, preferably 0.02-5.0% by weight, more preferably 0.05-4.0% in the insecticidal stock solution. Although it is blended by weight%, a multipurpose composition can be prepared by appropriately blending repellents, bactericides, fungicides, synergists, stabilizers, fragrances and the like.
[0006]
Examples of the lower alcohol used in the present invention include methanol, ethanol, n-propanol, isopropanol, n-butanol and the like, and 5.0 to 40.0% by weight is mixed in the insecticidal stock solution. If the amount of the lower alcohol is too small, the solubility of the insecticidal component is inferior, and if it is too large, the foamability is deteriorated, which is inappropriate. The lower alcohol used may be modified or unmodified, and of course other solvents such as ketone solvents such as acetone and methyl ethyl ketone, ethylene glycol, propylene glycol, etc. Polyhydric alcohols, ethers such as diethyl ether, ethylene glycol monoethyl ether and diethylene glycol monobutyl ether, esters such as isopropyl myristate, butyl stearate and castor oil, kerosene, kerosene and the like may be added as appropriate.
[0007]
The surfactant used in the present invention is a foamed aerosol insecticide of the present invention, which imparts foamability and is blended in order to disperse the insecticidal component stably and uniformly in the insecticide stock solution, and is nonionic. Surfactants, anionic surfactants, cationic surfactants, amphoteric surfactants and the like can be used, but nonionic surfactants are desirable. For example, sorbitan fatty acid ester, glycerin fatty acid ester, decaglycerin fatty acid ester, polyglycerin fatty acid ester, polyoxyethylene sorbitan fatty acid ester, polyoxyethylene glycerin fatty acid ester, polyethylene glycol fatty acid ester, polyoxyethylene alkyl ether, polyoxyethylene polyoxy Examples include propylene alkyl ether, polyoxyethylene alkylphenyl ether, polyoxyethylene castor oil / hardened castor oil, polyoxyethylene lanolin, lanolin alcohol, beeswax derivative, polyoxyethylene alkylamine, fatty acid amide, and the like. Of these, sorbitan fatty acid esters such as sorbitan monolaurate and polyoxyethylene sorbitan fatty acid esters such as polyoxyethylene sorbitan monolaurate are preferred. These surfactants can also be used as one or a mixture of two or more, and the blending ratio thereof may be a concentration that causes foaming at the time of injection, and the total amount of surfactant is usually a ratio with respect to the stock solution, 0.5 to 10.0% by weight, preferably 1.0 to 5.0% by weight is desirable. If the blending amount of the surfactant is small, the stability of the stock solution may be poor or foaming may be insufficient. If the amount is too large, the viscosity of the stock solution may change, or the stability at low temperatures may be deteriorated.
In addition, it is also possible to mix | blend a thickener (or foaming regulator) in order to adjust the production | generation of the foam by surfactant, and its stability and sustainability. As the thickener, for example, linear higher alcohols such as lauryl alcohol, cetyl alcohol, stearyl alcohol, behenyl alcohol, myristyl alcohol, oleyl alcohol, monostearyl glycerin ether, lanolin alcohol, hexyl decanol, isostearyl alcohol, octyldodecanol Branched chain higher alcohols such as polyethylene glycol, polyvinyl pyrrolidone, hydroxyethyl cellulose, carboxymethyl cellulose, sodium alginate, polyvinyl alcohol, higher fatty acids, hydroxypropyl cellulose, sodium polyacrylate, carboxyvinyl polymer, methyl hydroxypropyl cellulose, carrageenan, xanthan gum These may be used alone or in combination of two or more. Used in use. The blending ratio of the thickener is 0.1-7.5% by weight, preferably 0.2-5.0% by weight, based on the stock solution. If the blending amount of the thickener is small, foam formation and stability are poor. On the other hand, if the blending amount of the thickener is large, the viscosity becomes high and handling during production becomes difficult.
[0008]
Examples of fine powders insoluble or hardly soluble in water and lower alcohol used in the present invention include finely divided silicic acids (eg, amorphous / amorphous amorphous silicic acid, anhydrous silicic acid, hydrous silicic acid, etc.), Examples include inorganic powders such as aluminum oxide, kaolin, talc, titanium oxide, and magnesium carbonate, various natural and synthetic organic powders such as starch, urethane, nylon, and polypropylene, and salts such as magnesium stearate. Or two or more kinds can be used in combination. Of these, finely divided silicic acid is preferred. The fine powdered silicic acid is commercially available in various qualities having different particle diameters, specific surface areas, etc., but in the present invention, those having an average particle diameter of usually about 1-50 μm are preferred. Is particularly preferably about 5-30 μm. In addition, these preferable average particle diameters are a scale applicable to powders other than fine powder silicic acid. If the particle size is too large, the aerosol nozzle tends to be clogged.On the other hand, if the particle size is too small, the insecticide will gel and the viscosity becomes too high, making it difficult to fill the aerosol container during production. is there. Such fine powder silicic acid is commercially available, and examples thereof include Mizukasil P-78D (Mizusawa Chemical Co., Ltd.) and SMB C-30 (Fuji Devison Chemical Co., Ltd.). The blending amount of these fine powders is 0.5-20.0% by weight, preferably 1.0-15.0% by weight, more preferably 2.0-12, as a proportion of the foaming insecticide stock solution. .5% by weight.
[0009]
In the present invention, water is further added in an amount of 30 to 90% by weight, preferably 40 to 70% by weight. In order to stably maintain the properties of the insecticidal stock solution, it is preferable to use purified water that has been subjected to treatment such as deionization. Furthermore, as an optional component, a pH adjuster (for example, citric acid, fatty acid, succinic acid, or a salt thereof) For example, silicate, phosphate, sodium bisulfate, etc.) and perfume can also be blended.
[0010]
The foaming aerosol insecticide of the present invention is obtained by mixing and stirring the above-mentioned predetermined amounts of insecticide ingredients, lower alcohol, surfactant, thickener, fine powder and purified water to obtain a uniform suspension (insecticide stock solution). It can be manufactured by filling an aerosol container together with a predetermined amount of propellant. In addition, the addition order of each component is suitably changed according to the solubility of a compounding component, the viscosity of a liquid mixture, etc. The insecticidal stock solution and the propellant are in the range of 70: 30-98: 2 by weight, preferably in the range of 80: 20-95: 5.
[0011]
As the propellant that can be used in the present invention, generally known propellants can be used. Examples thereof include propane, normal butane, isobutane, isobutylene, dimethyl ether, carbon dioxide gas, nitrogen gas, and chlorofluorocarbon gas. If the amount of propellant is low, the resulting gas pressure is low, sufficient foam volume cannot be obtained, the drug is difficult to be sprayed uniformly, the aerosol valve is likely to be clogged, and the propellant is exhausted first and left behind Inconveniences such as inability to inject. In addition, if there is a large amount of propellant, the resulting gas pressure is high and the defoaming property is high, which causes foam formation failure and shortens the retention time of the foam. And cause scattering of fine powder components.
[0012]
The present invention is characterized in that the content liquid formulation is filled in an aerosol container, and the content liquid is ejected and applied in the form of foam. The structure of the aerosol container is composed of a pressure-resistant container and an injection valve, and does not require any special mechanism compared with conventional aerosols for spraying.For example, the nozzle hole diameter and shape can be changed from those of the conventional one, depending on the purpose. It is free to choose the appropriate amount of eruption.
[0013]
The foamed aerosol insecticide of the present invention thus obtained is capable of uniformly applying the insecticidal component because the insecticidal component is ejected in the form of foam, and at the same time, the risk of inhalation and dripping of the solution is applied. There is little worry and usability is very good. Furthermore, since the fine powder is blended in addition to the foaming component, it is possible to control the duration of the foam after treatment by using the fact that the kind and blending amount of the fine powder affects the stability of the foam. After defoaming, the fine powder to which the insecticidal component is adhered or adsorbed has an advantage that the insecticidal efficacy is maintained for a long time. Accordingly, the present invention applies coating treatment to places where pests such as gardens, entrances, living rooms, kitchens, window sashes, and walls inside and outside the house can pass through, and ants, cockroaches, rubber bugs, stink bugs, snails, slugs, centipedes, millipede The present invention provides a foaming aerosol insecticide that exhibits high control and prevention effects on various pests such as spiders and geese, and a coating method using the same.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
[0015]
【Example】
Aerosols corresponding to Examples and Comparative Examples having the following formulations were prepared, and their insecticidal effects were compared.

7% by weight of liquefied petroleum gas was added to 93% by weight of the mixed liquid, and the mixture was filled in an aerosol container (capacity 300 ml).
Example 2
An aerosol container was filled in the same manner as in Example 1 except that 5.0% by weight of finely divided silicic acid and 53.8% by weight of purified water were used.
Comparative Example An aerosol container was filled in the same manner as in Examples 1 and 2, except that finely divided silicic acid was not blended and 58.8% by weight of purified water was used.
(Barrier test against ants)
Garden soil or sand was spread over to a thickness of about 5 cm, and about 0.8 g of aerosol was sprayed on the surface in an annular shape having a diameter of about 7 cm, a width and a height of about 2 cm, and the drug was applied. After drying and defoaming with a dryer under incandescent lamp, immediately after leaving overnight, release Yamato Asanagaari inside the ring, capture what escaped outside the ring by itself, put it in another container, knock down The situation was observed.
[0016]
[Table 1]

[0017]
(Limited time contact test for ants)
Spray approximately 0.24g of aerosol on a paper towel with a diameter of 10cm, apply the drug uniformly, heat under incandescent light, defoam and dry, then contact 10 Yamato Ashagari for 1 minute on the drug application part I let you. After contact, it was transferred to another container and the knockdown situation was observed.
[0018]
[Table 2]

[0019]
As a result of the test, the foamed aerosol insecticide containing fine powder of the present invention showed an excellent knockdown effect not only immediately after defoaming / drying but also when left overnight after defoaming / drying. It was recognized to provide a practical and practical foam coating method. On the other hand, as shown in the comparative example, when the fine powder was not blended, the knockdown effect was clearly low both immediately after defoaming / drying and after standing overnight.
[0020]
【The invention's effect】
The present invention shows an excellent insecticidal effect not only in direct injection or immediately after injection, but also in the defoamed / dried state after the application time has passed, and the application state is good, with various sizes such as ants and cockroaches. A new fine-powdered foaming insecticide that satisfies the demands of enhanced efficacy and long-lasting efficacy that have not yet been fully achieved with conventional foaming aerosol insecticides used for the control of various insect pests An insecticidal component application method is provided.

Claims (3)

Insecticidal active ingredient 0.01-10.0% by weight,
Lower alcohol 5.0-40.0% by weight,
0.5 to 10.0% by weight of surfactant,
Thickener 0.1-7.5% by weight,
Silicic acid fine powder with an average particle size of 1-50 μm 0.5-20.0 wt% and water 30.0-90.0 wt%
A pest control foamable aerosol comprising 70-98% by weight of an insecticidal stock solution containing 2 and 30% by weight of a propellant. The foamable aerosol for pest control according to claim 1, wherein the insecticidal active ingredient is propoxur. An insecticidal component coating method comprising spraying and applying the foaming aerosol agent for controlling insects according to claim 1 or 2 to a place where insects can pass in a foam form.