JP2010248175A - Aqueous suspension type insecticidal composition - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent, in an aqueous suspension type insecticidal composition of an insecticidal compound being a solid powder at ordinary temperature, hard-cake formation and viscosity increase in a preparation due to the settling of suspended particles, and to realize good water dispersibility and long-term excellent stability of a preparation. <P>SOLUTION: The incorporation of a nonionic surfactant and a copolymer containing a carboxylic acid makes it possible to provide an aqueous suspension type insecticide which is lowly viscous, well dispersible in water, and excellent in long-term stability of a preparation. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

The present invention relates to an aqueous suspension insecticidal composition.

Formulation forms of general insecticidal compositions include wettable powders, powders, emulsions, aqueous suspensions, etc. Of these, wettable powders and powders are easy to form, but when diluted with water The emulsion has the disadvantage of being easily scattered around when it is powdered or sprayed, and the emulsion uses an emulsifier and an organic solvent, so there is an odor peculiar to the organic solvent, and there are problems in terms of flammability etc. . In contrast, aqueous suspensions are excellent in practical use because they do not require the use of large amounts of organic solvents.

However, the aqueous suspension has problems such as hard caking due to sedimentation of suspended particles, and the preparation itself tends to have a high viscosity, and the preparation cannot be made due to the high viscosity in the preparation. In order to solve these problems, a dispersant mainly composed of lignin sulfonate as a dispersant and a compound containing two or more inorganic thickeners as a thickener have been proposed. From the viewpoints of preventing the formulation from increasing in viscosity and being dispersible in water, it was difficult to say.

Japanese Patent Laid-Open No. 2003-321303 JP 2007-297316 A

An object of the present invention is to prevent hard caking due to sedimentation of suspended particles and increase in the viscosity of a preparation in an aqueous suspension-type insecticidal composition, and also has good dispersibility in water and excellent preparation stability over a long period of time.

The present inventor relates to an aqueous suspension insecticidal composition comprising an insecticidal compound which is a room temperature solid powder, a copolymer containing a nonionic surfactant and a carboxylic acid.

By using the composition of the present invention, it is possible to provide an aqueous suspension insecticide having a low viscosity, good dispersibility in water, and excellent formulation stability over a long period of time.

または、一般式（２）

（式中Ａは６−クロロ−３−ピリジル基、２−クロロ−５−チアゾリル基、テトラヒドロフラン−２−イル基、テトラヒドロフラン−３−イル基、５−メチルテトラヒドロフラン−３−イル基、３−ピリジル基、６−ブロモ−３−ピリジル基、３−シアノフェニル基、２−メチル−５−チアゾリル基、２−フェニル−５−チアゾリル基または２−ブロモ−５−チアゾリル基を表し、Ｒ１は水素原子、メチル基、エチル基、ホルミル基またはアセチル基を表し、Ｒ２はメチル基、アミノ基、メチルアミノ基、Ｎ，Ｎ―ジメチルアミノ基、エチルアミノ基、Ｎ，Ｎ―ジエチルアミノ基、Ｎ―メチル−N−エチルアミノ基、１−ピロリジニル基、（６−クロロ−３−ピリジル）メチルアミノ基またはＮ―メチル−Ｎ−（６−クロロ−３−ピリジル）メチルアミノ基を表し、Ｘは窒素原子またはＣＨ基を表し、Ｙはシアノ基、ニトロ基またはトリフルオロアセチル基を表し、ＺはＮＨ基またはイオウ原子を表し、ｍは０または１、ｎは２または３を表す）で示される殺虫組成物で特にクロチアニジン及びイミダクロプリドが好ましい。また、アクリナトリン、エトフェンプロックス、ビフェントリンなどのピレスロイド系化合物、クロルフルアズロン、フルフェノクスロン、メトキシフェノジドなどの昆虫成長調節剤、クロルフェナピル、フィプロニル、エチプロールなどの殺虫剤が挙げられるが、これらに限定されるものではない。これらは単独でも２種類以上を併用することができる。 The insecticidal compound which is a room temperature solid powder of the composition has the general formula (1),

Or general formula (2)

(In the formula, A represents 6-chloro-3-pyridyl group, 2-chloro-5-thiazolyl group, tetrahydrofuran-2-yl group, tetrahydrofuran-3-yl group, 5-methyltetrahydrofuran-3-yl group, 3-pyridyl group. Group, 6-bromo-3-pyridyl group, 3-cyanophenyl group, 2-methyl-5-thiazolyl group, 2-phenyl-5-thiazolyl group or 2-bromo-5-thiazolyl group, R1 represents a hydrogen atom Represents a methyl group, an ethyl group, a formyl group or an acetyl group, and R2 represents a methyl group, an amino group, a methylamino group, an N, N-dimethylamino group, an ethylamino group, an N, N-diethylamino group, an N-methyl- N-ethylamino group, 1-pyrrolidinyl group, (6-chloro-3-pyridyl) methylamino group or N-methyl-N- (6-chloro-3-pyridyl) me Represents a tilamino group, X represents a nitrogen atom or a CH group, Y represents a cyano group, a nitro group or a trifluoroacetyl group, Z represents an NH group or a sulfur atom, m is 0 or 1, n is 2 or Clothianidin and imidacloprid are particularly preferred. In addition, pyrethroids such as acrinathrin, etofenprox, bifenthrin, insect growth regulators such as chlorfluazuron, flufenoxuron, methoxyphenozide, and insecticides such as chlorfenapyr, fipronil, etiprole are limited to these. It is not something. These can be used alone or in combination of two or more.

The insecticidal compound is usually contained in the composition in an amount of 5 to 50% by weight, preferably 10 to 45% by weight, more preferably 15 to 40% by weight.

In addition, the particle size of the insecticidal compound in the present composition is usually 6 μm or less, preferably 3 μm or less, more preferably 1 μm or less as the volume median diameter at the time of manufacture from the viewpoint of preventing sedimentation during storage. Is adjusted to an appropriate particle size by grinding or the like.

Nonionic surfactants in the composition include alkyl allyl ether types such as polyoxyethylene nonylphenyl ether, alkyl ether types such as polyoxyethylene lauryl ether, alkyl esters such as polyoxyethylene oleate, polyoxyethylene Examples include, but are not limited to, polyhydric alcohol types such as ethylene sorbitan monooleate, and alkylallyl ether formalin condensates. These can be used alone or in combination of two or more. Furthermore, if necessary, a nonionic surfactant having an HLB of 11 or more can be used in combination.

The content of the nonionic surfactant in the composition is 0.3 to 15% by weight, preferably 0.5 to 10% by weight, more preferably 1 to 5% by weight.

Examples of the carboxylic acid in the copolymer containing a carboxylic acid in the present composition include acrylic acid, methacrylic acid, ethacrylic acid, fumaric acid, maleic acid, itaconic acid, and the like, particularly maleic acid, especially styrene-maleic acid. A copolymer and an olefin-maleic acid copolymer are preferred. These can be used alone or in combination of two or more.

The content of the copolymer containing carboxylic acid in the present composition is 0.05 to 10% by weight, preferably 0.1 to 7% by weight, and more preferably 0.3 to 5% by weight.

In the present composition, a viscosity modifier, an antifoaming agent, an antifreezing agent, an antiseptic, a stabilizer, a coloring agent, a fragrance and the like can be contained as necessary.

As long as the composition of the present invention exhibits the effects of the present invention, it can also contain acaricide, nematicide, fungicide, plant growth regulator, fertilizer and the like as appropriate.

(A) Insecticide compound (1) clothianidin (manufactured by Wako Pure Chemical Industries, Ltd.)
(2) Imidacloprid (Wako Pure Chemical Industries, Ltd.)
(3) Fipronil (Wako Pure Chemical Industries, Ltd.)
(4) Acetamiprid (Wako Pure Chemical Industries, Ltd.)
(B) Nonionic surfactant (1) New Calgen cp-80 (manufactured by Takemoto Yushi Co., Ltd.)
(2) Ionette S-80 (Sanyo Chemical Industries, Ltd.)
(3) Solpol 3125 (manufactured by Toho Chemical Co., Ltd.)
(C) Carboxylic acid copolymer (1) Florene G-700 (manufactured by Kyoeisha Chemical Co., Ltd.)
(2) Floren TG-750W (manufactured by Kyoeisha Chemical Co., Ltd.)
(D) Other
(1) Riax 85A (made by West Beco)
(2) Kelzan S (manufactured by Kelco, thickener)

Example 1
15% by weight of clothianidin, 0.7% by weight of Floren G-700, 2.51.5% by weight of Neukalgen cp-80, and 32.8% by weight of ion-exchanged water were mixed and pulverized for 60 minutes by a Glen mill. Thereafter, 0.2% by weight of Kelzan S and 49.8% by weight of ion-exchanged water were added and stirred for 30 minutes to obtain the present composition 1.

(Examples 2-7, Comparative Examples 1-6)
The same preparation as in Example 1 was carried out as shown in Table 1. Comparative Examples 2 to 6 could not be formulated due to increased viscosity.

(Test Example 1)
100 g of Example 1 and Comparative Example 1 were placed in a 140 mL glass bottle and stored at 45 ° C. for 1 month. Thereafter, the supernatant of the glass bottle was collected and the clothianidin concentration was measured by liquid chromatography. The results are shown in Table 2.

(Test Example 2)
Each 1 g of Example 3 and commercially available aqueous suspension insecticide Hachikusan FL (imidacloprid 20%, Bayer CropScience Co., Ltd.) was diluted 200 times with ion-exchanged water and placed in a glass bottle. After placing at room temperature for 4 days, the appearance was compared by shaking lightly. The results are shown in Table 3.

By using the composition of the present invention, it is possible to provide an aqueous suspension insecticide having a low viscosity, good dispersibility in water, and excellent formulation stability over a long period of time.

Claims (4)

An aqueous suspension comprising an insecticidal compound which is a room temperature solid powder, (b) one or more nonionic surfactants, and (c) a copolymer containing one or more carboxylic acids. Insecticidal composition. The insecticidal compound which is a room temperature solid powder according to claim 1 is represented by the general formula (1),

Or general formula (2)

(In the formula, A represents 6-chloro-3-pyridyl group, 2-chloro-5-thiazolyl group, tetrahydrofuran-2-yl group, tetrahydrofuran-3-yl group, 5-methyltetrahydrofuran-3-yl group, 3-pyridyl group. Group, 6-bromo-3-pyridyl group, 3-cyanophenyl group, 2-methyl-5-thiazolyl group, 2-phenyl-5-thiazolyl group or 2-bromo-5-thiazolyl group, R1 represents a hydrogen atom Represents a methyl group, an ethyl group, a formyl group or an acetyl group, and R2 represents a methyl group, an amino group, a methylamino group, an N, N-dimethylamino group, an ethylamino group, an N, N-diethylamino group, an N-methyl- N-ethylamino group, 1-pyrrolidinyl group, (6-chloro-3-pyridyl) methylamino group or N-methyl-N- (6-chloro-3-pyridyl) Represents a tilamino group, X represents a nitrogen atom or a CH group, Y represents a cyano group, a nitro group or a trifluoroacetyl group, Z represents an NH group or a sulfur atom, m is 0 or 1, n is 2 or 3 represents an aqueous suspension insecticidal composition. An aqueous suspension insecticidal composition, wherein the copolymer containing carboxylic acid according to claim 1 or 2 is a copolymer containing maleic acid. An aqueous suspension insecticidal composition wherein the insecticidal compound which is a room temperature solid powder according to claim 1, 2 or 3 is clothianidin or imidacloprid.