JP2011079740A - Aqueous suspension-like agrochemical composition - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an agrochemical composition having an excellent performance. <P>SOLUTION: The aqueous suspension-like agrochemical composition having an excellent performance comprises a sulfonylurea-based herbicidal active compound solid at 25°C, a sucrose fatty acid ester, an acetylene glycol-based surfactant, an anionic surfactant, fine montmorillonite-based mineral substance powder, a water-soluble polymer dispersant, and water. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an aqueous suspension agricultural chemical composition.

〔式中、Ａ^１は置換基を有していてもよいフェニル基又は置換基を有していてもよい芳香族複素環基を表し、Ａ^２は４，６−ジメトキシピリミジン−２−イル基又は２，４−ジメトキシ−１，３，５−トリアジン−６−イル基を表し、ＸはＣＨ_２、ＮＨ、酸素原子又は単結合を表す。〕で示されるスルホニルウレア化合物が挙げられ、より詳しくは、式（II）

〔式中、Ｒ^１はハロゲン原子を表し、Ｒ^２はＣ２−Ｃ４アルキル基又はシクロプロピル基を表す。〕で示される化合物が除草活性を有することが知られている（例えば、特許文献１参照。）。
In view of the aging of agricultural workers, the decrease in the number of workers, and the like, there is a demand for a preparation that can spray an agrochemical active compound by a simpler method. Pesticide compositions in the form of powders and granules are used as preparations containing a solid poorly water-soluble herbicidal active compound at about 25 ° C. For example, spray directly on the paddy field under flooded water. Aqueous suspension pesticide compositions that can be used are also in practical use.
However, when a conventional aqueous suspension pesticide composition is applied locally to the paddy sewage paddy field directly from the shore of the paddy field, it does not necessarily spread to the whole paddy field. In some cases, it could not be expressed.
Certain pesticide active compounds include those of formula (I)

[Wherein, A ¹ represents a phenyl group which may have a substituent or an aromatic heterocyclic group which may have a substituent, and A ² represents a 4,6-dimethoxypyrimidin-2-yl group. Alternatively, it represents a 2,4-dimethoxy-1,3,5-triazin-6-yl group, and X represents CH ₂ , NH, an oxygen atom or a single bond. A sulfonylurea compound represented by the formula (II).

[Wherein, R ¹ represents a halogen atom, and R ² represents a C2-C4 alkyl group or a cyclopropyl group. ] It is known that the compound shown by this will have herbicidal activity (for example, refer patent document 1).

JP2004-123690A

  The present invention is an agrochemical composition with excellent performance that can quickly diffuse throughout the paddy field and express the efficacy of the agrochemical active compound even when applied locally, such as direct spraying from the shore of a flooded sewage paddy field The issue is to provide goods.

〔式中、Ｒ^１はハロゲン原子を表し、Ｒ^２はＣ２−Ｃ４アルキル基又はシクロプロピル基を表す。〕
で示される化合物である〔１〕又は〔２〕記載の水性懸濁状農薬組成物。
〔４〕 ２５℃で固体のスルホニルウレア系除草活性化合物が、１−（２−クロロ−６−プロピルイミダゾ〔１，２−ｂ〕ピリダジン−３−イルスルホニル）−３−（４，６−ジメトキシピリミジン−２−イル）ウレアである〔１〕又は〔２〕記載の水性懸濁状農薬組成物。
〔５〕 アセチレングリコール系界面活性剤が、０．１％水溶液での表面張力が２５〜３９ｍＮ／ｍであり、ＨＬＢ値が４〜９であり、且つ、平均付加モル数が１〜５であるエチレンオキサイド鎖を有するアセチレングリコールエーテルである〔１〕〜〔４〕いずれか一項記載の水性懸濁状農薬組成物。
〔６〕 アニオン性界面活性剤が、ポリオキシアルキレンアリールフェニルエーテル燐酸エステル塩である〔１〕〜〔５〕いずれか一項記載の水性懸濁状農薬組成物。
〔７〕 水溶性高分子分散剤が、ポリビニルアルコール及びカルボキシメチルセルロース塩からなる群より選ばれる少なくとも１種である〔１〕〜〔６〕いずれか一項記載の水性懸濁状農薬組成物。
〔８〕 〔１〕〜〔７〕いずれか一項記載の水性懸濁状農薬組成物を、湛水下水田に直接散布することを特徴とする水田に発生する雑草の防除方法。 As a result of studies to provide an excellent agrochemical composition, the present inventors have determined that a sulfonylurea herbicidal active compound, sucrose fatty acid ester, acetylene glycol surfactant, anionic surfactant, montmorillonite based solid at 25 ° C. It has been found that an aqueous suspended agricultural chemical composition containing a fine mineral powder, a water-soluble polymer dispersant and water has excellent performance, and has led to the present invention.
That is, the present invention is as follows [1] to [8].
[1] Aqueous solution containing a sulfonylurea herbicidal active compound, sucrose fatty acid ester, acetylene glycol surfactant, anionic surfactant, montmorillonite mineral fine powder, water-soluble polymer dispersant and water solid at 25 ° C. Suspended agricultural chemical composition.
[2] For the total amount of the aqueous suspension pesticide composition,
0.5 to 10% by weight of sulfonylurea herbicidal active compound solid at 25 ° C., 0.1 to 5% by weight of sucrose fatty acid ester, 0.02 to 1% by weight of acetylene glycol surfactant, anionic interface The active agent is 0.1 to 5% by weight, the montmorillonite mineral fine powder is 0.1 to 3% by weight, and the water-soluble polymer dispersant is 0.1 to 5% by weight [1] An aqueous suspension pesticide composition.
[3] A sulfonylurea herbicidal compound which is solid at 25 ° C. is represented by the following formula (II):

[Wherein, R ¹ represents a halogen atom, and R ² represents a C2-C4 alkyl group or a cyclopropyl group. ]
The aqueous suspension agricultural chemical composition according to [1] or [2], which is a compound represented by the formula:
[4] A sulfonylurea herbicidal compound that is solid at 25 ° C. is 1- (2-chloro-6-propylimidazo [1,2-b] pyridazin-3-ylsulfonyl) -3- (4,6-dimethoxypyrimidine The aqueous suspended agricultural chemical composition according to [1] or [2], which is 2-yl) urea.
[5] The acetylene glycol surfactant has a surface tension of 25 to 39 mN / m in a 0.1% aqueous solution, an HLB value of 4 to 9, and an average added mole number of 1 to 5. The aqueous suspended agricultural chemical composition according to any one of [1] to [4], which is an acetylene glycol ether having an ethylene oxide chain.
[6] The aqueous suspended agricultural chemical composition according to any one of [1] to [5], wherein the anionic surfactant is a polyoxyalkylene arylphenyl ether phosphate ester salt.
[7] The aqueous suspended agricultural chemical composition according to any one of [1] to [6], wherein the water-soluble polymer dispersant is at least one selected from the group consisting of polyvinyl alcohol and carboxymethylcellulose salt.
[8] A method for controlling weeds generated in paddy fields, wherein the aqueous suspended agricultural chemical composition according to any one of [1] to [7] is directly sprayed on flooded sewage paddy fields.

  According to the present invention, it is possible to provide an agrochemical composition that exhibits sufficiently excellent performance even when local application such as direct spraying from the shore of a flooded sewage paddy field is performed.

  The aqueous suspension pesticide composition of the present invention is a sulfonylurea herbicidal active compound, sucrose fatty acid ester, acetylene glycol surfactant, anionic surfactant, montmorillonite mineral fine powder, water-soluble, solid at 25 ° C. An aqueous suspended agricultural chemical composition containing a polymer dispersant and water.

〔式中、Ａ^１は置換基を有していてもよいフェニル基又は置換基を有していてもよい芳香族複素環基を表し、Ａ^２は４，６−ジメトキシピリミジン−２−イル基又は２，４−ジメトキシ−１，３，５−トリアジン−６−イル基を表し、ＸはＣＨ_２、ＮＨ、酸素原子又は単結合を表す。〕で示されるスルホニルウレア化合物が挙げられる。 Examples of the sulfonylurea herbicidal compound that is solid at 25 ° C. used in the present invention include those represented by the following formula (I):
Formula (I)

[Wherein, A ¹ represents a phenyl group which may have a substituent or an aromatic heterocyclic group which may have a substituent, and A ² represents a 4,6-dimethoxypyrimidin-2-yl group. Alternatively, it represents a 2,4-dimethoxy-1,3,5-triazin-6-yl group, and X represents CH ₂ , NH, an oxygen atom or a single bond. ] The sulfonylurea compound shown by these is mentioned.

  Specific examples of the sulfonylurea compound represented by the formula (I) include 1- (2-chloroimidazo [1,2-a] pyridin-3-ylsulfonyl) -3- (4,6-dimethoxypyrimidine- 2-yl) urea (imazosulfuron), 1- (2-ethylsulfonylimidazo [1,2-a] pyridin-3-ylsulfonyl) -3- (4,6-dimethoxypyrimidin-2-yl) urea (sulfos) Ruflon), methyl = α- (4,6-dimethoxypyrimidin-2-ylcarbamoylsulfamoyl) -0-toluate (bensulfuronmethyl), 1- (4,6-dimethoxypyrimidin-2-yl) -3- (2-Ethoxyphenoxysulfonyl) urea (ethoxysulfuron), ethyl = 5- (4,6-dimethoxypyrimidin-2-ylcarbamoy Sulfamoyl) -1-methylpyrazole-4-carboxylate (pyrazolsulfuronethyl), 1- (4,6-dimethoxypyrimidin-2-yl) -3- [1-methyl-4- (2-methyl-2H-) Tetrazol-5-yl) pyrazol-5-ylsulfonyl] urea (azimylsulfuron), methyl 3-chloro-5- (4,6-dimethoxypyrimidin-2-ylcarbamoylsulfamoyl) -1-methylpyrazole-4 -Carboxylate (halosulfuronmethyl), 1- (4,6-dimethoxypyrimidin-2-yl) -3- (3-trifluoromethyl-2-pyridinesulfonyl) urea (furazasulfuron), 3- (4 6-Dimethoxy-1,3,5-triazin-2-yl) -1- [2- (2-methoxyethoxy) -phenylsulfonyl ] Urea (sinosulfuron), 1- [2- (cyclopropylcarbonyl) anilinosulfonyl] -3- (4,6-dimethoxypyrimidin-2-yl) urea (cyclosulfamuron).

〔式中、Ｒ^１aはハロゲン原子を表し、Ｒ^２aはＣ２−Ｃ４アルキル基又はシクロプロピル基を表す。〕
で示される化合物が挙げられ、前記式（ＩＩ）で示される化合物としては、具体的には例えば、１−（２−クロロ−６−エチルイミダゾ〔１，２−ｂ〕ピリダジン−３−イルスルホニル）−３−（４，６−ジメトキシピリミジン−２−イル）ウレア、１−（２−クロロ−６−プロピルイミダゾ〔１，２−ｂ〕ピリダジン−３−イルスルホニル）−３−（４，６−ジメトキシピリミジン−２−イル）ウレア、１−（２−クロロ−６−ブチルイミダゾ〔１，２−ｂ〕ピリダジン−３−イルスルホニル）−３−（４，６−ジメトキシピリミジン−２−イル）ウレア、１−（２−クロロ−６−シクロプロピルイミダゾ〔１，２−ｂ〕ピリダジン−３−イルスルホニル）−３−（４，６−ジメトキシピリミジン−２−イル）ウレア及び１−（２−クロロ−６−イソブチルイミダゾ〔１，２−ｂ〕ピリダジン−３−イルスルホニル）−３−（４，６−ジメトキシピリミジン−２−イル）ウレアが挙げられる。
本発明の水性懸濁状農薬組成物には、かかる２５℃で固体のスルホニルウレア系除草活性化合物が、通常０．５〜１０重量％、好ましくは１〜１０重量％程度含有される。 Of these, the following formula (II) described in JP-A No. 2004-123690 is more specifically described.

[Wherein, R ^1a represents a halogen atom, and R ^2a represents a C2-C4 alkyl group or a cyclopropyl group. ]
Specific examples of the compound represented by the above formula (II) include 1- (2-chloro-6-ethylimidazo [1,2-b] pyridazin-3-ylsulfonyl ) -3- (4,6-Dimethoxypyrimidin-2-yl) urea, 1- (2-chloro-6-propylimidazo [1,2-b] pyridazin-3-ylsulfonyl) -3- (4,6 -Dimethoxypyrimidin-2-yl) urea, 1- (2-chloro-6-butylimidazo [1,2-b] pyridazin-3-ylsulfonyl) -3- (4,6-dimethoxypyrimidin-2-yl) Urea, 1- (2-chloro-6-cyclopropylimidazo [1,2-b] pyridazin-3-ylsulfonyl) -3- (4,6-dimethoxypyrimidin-2-yl) urea and 1- (2- Chloro 6- isobutyl-imidazo [1,2-b] pyridazin-3-ylsulfonyl) -3- (4,6-dimethoxypyrimidin-2-yl) urea and the like.
In the aqueous suspension agricultural chemical composition of the present invention, the sulfonylurea herbicidal active compound which is solid at 25 ° C. is usually contained in an amount of about 0.5 to 10% by weight, preferably about 1 to 10% by weight.

  The aqueous suspension pesticide composition of the present invention may contain other pesticidal active compounds together with the sulfonylurea herbicidal active compound that is solid at 25 ° C. Examples of such other agrochemical active compounds include, , Bromobutide and pyraclonyl.

  When such other pesticidal active compounds are contained, the content in the aqueous suspension pesticidal composition of the present invention is the total amount of the sulfonylurea herbicidal active compound and other pesticidal active compounds that are solid at 25 ° C. It is about 5 to 20% by weight, preferably about 1 to 20% by weight.

  Examples of the sucrose fatty acid ester contained in the aqueous suspension agricultural chemical composition of the present invention include methyl sucrose stearate, methyl sucrose palmitate, and methyl sucrose oleate. Examples include Calgen FS-100 (manufactured by Takemoto Yushi) and DK ester S-160 (manufactured by Daiichi Kogyo Seiyaku). Such sucrose fatty acid esters can be contained in the aqueous suspension pesticide composition of the present invention alone or in admixture of two or more, but the content in the aqueous suspension pesticide composition of the present invention is: Usually, it is about 0.1 to 5% by weight, preferably about 0.5 to 5% by weight.

  The acetylene glycol surfactant contained in the aqueous suspension pesticide composition of the present invention is an acetylene glycol structure having a triple bond in the center and a symmetrical structure containing hydroxyl groups on both sides thereof. And the ethylene oxide adduct thereof. The acetylene glycol surfactant preferably has a surface tension in a 0.1% aqueous solution of 25 to 39 mN / m, an HLB value of 4 to 9, and an average added mole number of 1 to 5. Specific examples thereof include acetylene glycol ethers having an ethylene oxide chain, specifically, for example, Orphine E-1004 (trade name of Nissin Chemical Industry, surface tension of 0.1% aqueous solution: mN / m, average of ethylene oxide chains) Addition mole number: 4, HLB value: 7-9) is mentioned.

  Such an acetylene glycol surfactant is usually contained in the aqueous suspension agricultural chemical composition of the present invention in an amount of about 0.02 to 1% by weight, preferably about 0.05 to 1% by weight.

As an anionic surfactant contained in the aqueous suspension pesticide composition of the present invention, for example,
Polyoxyethylene aryl phenyl ether phosphate (for example, New Calgen FS-3PG: manufactured by Takemoto Yushi), alkyl sulfate (for example, Monogen Y-500: manufactured by Daiichi Kogyo Seiyaku), polyoxyethylene aryl phenyl ether sulfate (for example, , Agrisol FL-2017: manufactured by Kao), polyoxyalkylene aryl phenyl ether sulfate (for example, New Calgen FS-7: manufactured by Takemoto Yushi), and dioctylsulfosuccinate (for example, Neocor YSK: manufactured by Daiichi Kogyo Seiyaku Co., Ltd.) Sanmorin OT-70: manufactured by Sanyo Chemical Industries). Such an anionic surfactant is usually contained in the aqueous suspension agricultural chemical composition of the present invention in an amount of 0.1 to 5% by weight, preferably about 0.3 to 5% by weight.

  The montmorillonite-based mineral fine powder contained in the aqueous suspension pesticide composition of the present invention is a water-swellable clay mineral substance powder mainly composed of sodium (Na) montmorillonite or calcium (Ca) montmorillonite. In general, the passage through a sieve having an opening of 40 μm is 75% by weight or more. In the present invention, the montmorillonite-based mineral fine powder is a mineral fine powder having a swelling power of usually 5 to 70 ml / 2 g according to the ACC method. As the montmorillonite-based mineral fine powder, those generally marketed as bentonite or high-purity montmorillonite can be used. Examples of commercial products of bentonite include Super Clay (manufactured by Hojun), Kunigel VA, and Kunigel V1 (all manufactured by Kunimine Industries). ), Bengel and Bengel HVP (both made by Hojun).

  In the aqueous suspension agricultural chemical composition of the present invention, such montmorillonite mineral fine powder is usually contained in an amount of 0.1 to 3% by weight, preferably about 0.2 to 2% by weight.

Examples of the water-soluble polymer dispersant contained in the aqueous suspension pesticide composition of the present invention include, for example, a water-soluble natural polymer dispersant, a water-soluble semi-synthetic polymer dispersant, and a water-soluble synthetic polymer dispersant. Specific examples of the water-soluble natural polymer dispersant include sodium alginate, gum arabic, guar gum, and xanthan gum. Examples of the water-soluble semi-synthetic polymer dispersant include Examples thereof include cellulose-based dispersants of carboxymethylcellulose salts. Examples of water-soluble synthetic polymer-based dispersants include polyvinyl alcohol and polyvinyl bilidone.
As such a water-soluble polymer dispersant, commercially available ones can be used. Examples of polyvinyl alcohol include GOHSENOL GL-03 (manufactured by Nippon Synthetic Chemical Industry) and GOHSENOL KL-05 (manufactured by Nippon Synthetic Chemical Industry). ) And Kuraray Poval PVA-224 (manufactured by Kuraray),
Examples of the carboxymethyl cellulose salt include cellogen 6A (manufactured by Daiichi Kogyo Seiyaku), cellogen 7A (manufactured by Daiichi Kogyo Seiyaku), CMC Daicel 1110 (manufactured by Daicel Chemical Industries) and CMC Daicel 1210 (manufactured by Daicel Chemical Industries).
As xanthan gum, Kelzan (manufactured by Sanyo Chemical Industries), Roadpole 23 (manufactured by Rhône Poulenc) are listed,
Examples of the polyol derivative include Agrisol FL-104FA (manufactured by Kao).

In the present invention, as the water-soluble polymer dispersant, those having a relatively low viscosity when dissolved in water can be preferably used, and as the polyvinyl alcohol, the viscosity in a 4% by weight aqueous solution is 1 to 25 mPa · s (Heppler). Polyvinyl alcohol which is a viscometer (20 ° C.) is preferable, and the carboxymethyl cellulose salt is preferably a carboxymethyl cellulose salt having a viscosity in a 2% by weight aqueous solution of 1 to 100 mPa · s (B-type viscometer, 60 rpm, 25 ° C.).
Examples of the polyvinyl alcohol having a viscosity of 1 to 25 mPa · s (Heppler viscometer, 20 ° C.) in a 4% by weight aqueous solution include polyvinyl alcohol having a saponification degree in the range of 70 to 95 mol%. GL-03 and Gohsenol KL-05 (both manufactured by Nippon Synthetic Chemical Industry) are listed.
As the carboxymethyl cellulose salt having a viscosity in a 2% by weight aqueous solution of 1 to 100 mPa · s (B-type viscometer, 60 rpm, 25 ° C.), a carboxymethyl cellulose salt having a degree of etherification in the range of 0.4 to 1.0. In a commercial item, Serogen 7A (made by Daiichi Kogyo Seiyaku) is mentioned.

  In the aqueous suspended agricultural chemical composition of the present invention, such a water-soluble polymer dispersant is usually contained in an amount of 0.1 to 5% by weight, preferably about 0.1 to 3% by weight.

  The aqueous suspension agricultural chemical composition of the present invention comprises a sulfonylurea herbicidal active compound, sucrose fatty acid ester, acetylene glycol surfactant, anionic surfactant, montmorillonite mineral fine powder, Along with the molecular dispersant, a formulation aid used in a normal aqueous suspension agricultural chemical composition can be contained as necessary. Examples of such formulation aids include antifreeze agents, pH adjusters, antifoaming agents, and preservatives. These formulation aids can be appropriately selected according to the type and content of the sulfonylurea herbicidal active compound that is solid at 25 ° C.

  The aqueous suspension agricultural chemical composition of the present invention comprises a sulfonylurea herbicidal active compound, sucrose fatty acid ester, acetylene glycol surfactant, anionic surfactant, montmorillonite mineral fine powder, It is a composition in which a molecular dispersant and a formulation aid used as necessary are dispersed or dissolved in an aqueous medium. The water contained in the aqueous suspension pesticide composition of the present invention is not particularly limited, and water that can be used for ordinary aqueous pesticide compositions such as tap water, well water, and ion exchange water can be used. . In the aqueous suspended agricultural chemical composition of the present invention, water is usually contained in an amount of about 30 to 90% by weight, preferably about 50 to 80% by weight.

The aqueous suspended agricultural chemical composition of the present invention can be produced, for example, by the method shown below.
A sulfonylurea herbicidal active compound, sucrose fatty acid ester, acetylene glycol surfactant, anionic surfactant, montmorillonite mineral fine powder and water-soluble polymer dispersant solid at 25 ° C., and used as necessary A method in which a formulation aid is added to water, and the mixture is sufficiently stirred and mixed with, for example, a high-speed stirrer, and then finely pulverized and dispersed with a wet pulverizer such as dynomill or microfluidizer (Production Method 1),
The raw material of the sulfonylurea herbicidal active compound that is solid at 25 ° C. is finely pulverized by a dry pulverizer such as a jet mizer, and then other ingredients are added to water, and the mixture is added with a high-speed stirrer to about 30-90. A method of stirring, mixing and dispersing for about minutes (Production Method 2) can be mentioned.
In the aqueous suspension agricultural chemical composition of the present invention, the sulfonylurea herbicidal active compound that is solid at 25 ° C. is dispersed in water in the form of fine particles, and the average particle size of the fine particles is 10 μm or less, preferably 0.2. ~ 5 μm.

  The aqueous suspension pesticide composition of the present invention can be used as it is or after being diluted with water if desired and sprayed according to a known method. For example, it can be sprayed directly on a flooded sewage paddy field. You can also. When spraying the aqueous suspension pesticide composition of the present invention as it is to a paddy field or the like, after gently shaking the container containing the aqueous suspension pesticide composition of the present invention before use, a small amount along the shore Use by spraying one by one. When the aqueous suspension pesticide composition of the present invention is diluted with water and sprayed, it is applied to the paddy field, field, orchard, lawn, non-agricultural land, etc., using a known sprayer, etc. Use by spraying. Moreover, it can also be used for seed processing, seedling box processing, etc. using this water dilution liquid.

  EXAMPLES Next, although an Example demonstrates this invention in detail, this invention is not limited only to these examples.

Production Example 1
1- (2-Chloro-6-propylimidazo [1,2-b] pyridazin-3-ylsulfonyl) -3- (4,6-dimethoxypyrimidin-2-yl) urea (hereinafter referred to as Compound A). ) 1.8 parts by weight, pyraclonyl 4.0 parts by weight, sorbic acid 0.1 parts by weight, silicon-based antifoaming agent (Antihome E-20, manufactured by Kao) 0.3 parts by weight, propylene glycol 6.6 parts by weight , Sucrose fatty acid ester (New Calgen FS-100, Takemoto Yushi) 1.0 part by weight, polyoxyethylene arylphenyl ether phosphate (New Calgen FS-3PG: Takemoto Yushi) 0.8 part by weight, sodium lignin sulfonate (New Calgen RX-B, manufactured by Takemoto Yushi) 0.1 parts by weight, acetylene glycol surfactant (Olfin E-1004, manufactured by Nissin Chemical) 0.1 layer After adding 34.2 parts by weight of ion-exchanged water to 1.0 part by weight of sodium montmorillonite (Kunipia F, Kunimine Industries), mixing and dispersing the mixture, Dynomill KDL (manufactured by Shinmaru Enterprises) is used. And wet-pulverized to obtain a suspension (1) containing Compound A.
On the other hand, 1.0 part by weight of sodium carboxymethylcellulose (Serogen 7A, manufactured by Daiichi Kogyo Seiyaku Co., Ltd.) and 0.05 part by weight of xanthan gum (Lord Pole 23, manufactured by Rhodia Nikka) were added to 48.95 parts by weight of ion-exchanged water. In addition, it was dissolved to obtain an aqueous solution (1).
50 parts by weight of the aqueous solution (1) is added to 50 parts by weight of the suspension (1) containing the compound A to make 100 parts by weight, and the whole is stirred and mixed to obtain 1.8% by weight of the compound A and pyraclonil. An aqueous suspended agricultural chemical composition (hereinafter referred to as the present invention composition A) containing 4.0% by weight was obtained.

Reference production example 1
This compound A 1.8 weight part, Pyraclonil 4.0 weight part, Sorbic acid 0.1 weight part, Silicone-type antifoamer (Antihome E-20, Kao make) 0.3 weight part, Propylene glycol 6.6 Parts by weight, sucrose fatty acid ester (New Calgen FS-100, Takemoto Yushi) 1.0 part by weight, polyoxyethylene arylphenyl ether phosphate (New Cargen FS-3PG: Takemoto Yushi) 0.8 part by weight, lignin sulfone Sodium acid (Neucalgen RX-B, Takemoto Yushi) 0.1 parts by weight, acetylene glycol surfactant (Olfin E-1004, manufactured by Nissin Chemical) 0.1 part by weight, and sodium montmorillonite (Kunipia F, Kunimine Industries) Add 1.0 parts by weight of 34.2 parts by weight of ion-exchanged water, and mix and disperse. Numa Enterprises) was used for wet pulverization to obtain a suspension (2) containing the present compound A.
50 parts by weight of the aqueous solution (1) of Production Example 1 is added to 50 parts by weight of the suspension (2) containing the present compound to make a total amount of 100 parts by weight, and the mixture is stirred and mixed. An aqueous suspension agricultural chemical composition (hereinafter referred to as control composition A) containing 4.0% by weight of pyraclonil was obtained.

Test example 1 (indoor expansibility test)
12.5 L of water was put into a container having a length of 200 cm and a width of 12.5 cm, and 2 ml of the test agricultural chemical composition was dropped from a height of about 5 cm from the water surface to a point 5 cm from one end of the container. After standing for 8 hours, 10 ml each of water was collected from the dropping point, point A 95 cm away from the dropping point, and point B 190 cm away from the dropping point, and the concentration of Compound A in water was measured.
Further, the ratio (the ideal concentration ratio) to the concentration of the present compound A (ideal concentration: 2.7 ppm) when the test agricultural chemical composition was uniformly diffused in the water of the container was determined.
The results are shown in [Table 1].

Test example 2 (field test)
In the test plot (30 m ² ) having a length of 15 m and a width of 2 m, the naturally occurring nobier and the dog firefly reached 2.0-3.0 leaf stage and 2.5-4.0 leaf stage, respectively. After making the flooded water 5 cm, the test agricultural chemical composition was band-treated at one end (treatment point) of the test area so as to have a predetermined dosage per hectare.
Six hours after the chemical treatment, 100 ml of water was collected from the treatment point, the point C 5 m away from the treatment point and the point D 10 m away from the treatment point, the concentration of the compound A in the water was measured, and the test agricultural chemical composition The ratio of this compound A with respect to the concentration (ideal concentration) when it diffused uniformly in the water of the test section (the ideal concentration ratio) was determined. The results are shown in [Table 2].
In addition, 45 days after the drug treatment, the herbicidal effect against nobies and Inu firefly at the point C, the point D, and the point E 15 m away from the treatment point was evaluated by observation evaluation (0: no action to 100: complete death). The results are shown in [Table 3].

Claims (8)

  Aqueous suspension containing sulfonylurea herbicidal compound, sucrose fatty acid ester, acetylene glycol surfactant, anionic surfactant, montmorillonite mineral fine powder, water-soluble polymer dispersant and water solid at 25 ° C. Agrochemical composition. For the total amount of the aqueous suspension pesticide composition,
0.5 to 10% by weight of sulfonylurea herbicidal active compound solid at 25 ° C., 0.1 to 5% by weight of sucrose fatty acid ester, 0.02 to 1% by weight of acetylene glycol surfactant, anionic interface The activator is 0.1 to 5% by weight, the montmorillonite mineral fine powder is 0.1 to 3% by weight, and the water-soluble polymer dispersant is 0.1 to 5% by weight. An aqueous suspension pesticide composition. The sulfonylurea herbicidal compound which is solid at 25 ° C. is represented by the following formula (II)

[Wherein, R ¹ represents a halogen atom, and R ² represents a C2-C4 alkyl group or a cyclopropyl group. ]
The aqueous suspended pesticidal composition according to claim 1 or 2, which is a compound represented by the formula:   The sulfonylurea herbicidal compound which is solid at 25 ° C. is 1- (2-chloro-6-propylimidazo [1,2-b] pyridazin-3-ylsulfonyl) -3- (4,6-dimethoxypyrimidine-2- The aqueous suspension agricultural chemical composition according to claim 1 or 2, which is yl) urea.   An acetylene glycol-based surfactant has an ethylene oxide chain having a surface tension of 25 to 39 mN / m in a 0.1% aqueous solution, an HLB value of 4 to 9, and an average added mole number of 1 to 5. The aqueous suspended agricultural chemical composition according to any one of claims 1 to 4, which is an acetylene glycol ether having a water content.   The aqueous suspension agricultural chemical composition according to any one of claims 1 to 5, wherein the anionic surfactant is a polyoxyalkylene aryl phenyl ether phosphate ester salt.   The aqueous suspension pesticide composition according to any one of claims 1 to 6, wherein the water-soluble polymer dispersant is at least one selected from the group consisting of polyvinyl alcohol and carboxymethyl cellulose salt.   A method for controlling weeds generated in paddy fields, characterized in that the aqueous suspended agricultural chemical composition according to any one of claims 1 to 7 is directly sprayed on flooded sewage paddy fields.