JPH0543402A - Water-dispersivle granular agricultural chemicla composition - Google Patents

Abstract

PURPOSE:To obtain an agricultural chemical composition having excellent disintegrability and dispersibility in water even in a state containing the agricultural active component at high concentration and storable without causing the deterioration of the above characteristics with time. CONSTITUTION:The objective composition contains (A) preferably 1-90wt.% (especially 10-80wt.%) of an agricultural active component such as pyridaben, pyrazosulfuron-ethyl and quizalofop-ethyl, (B) preferably 5-30wt.% (especially 10-20wt.%) of a surfactant selected from ligninsulfonic acid, naphthalene sulfonic acid formaldehyde condensate, maleic acid-diisobutylene copolymer, maleic acid-isobutylene copolymer, their alkali metal or alkaline-earth metal salt, ammonium salt and amine salt and (C) preferably 1-10wt.% (especially 2-5wt.%) of a surfactant selected from an alkylnaphthalenesulfonic acid, polyoxyethylene alkylphenyl ether sulfuric acid ester, polyoxyethylene styrylphenyl ether sulfuric acid ester and their salt.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water-dispersible granular pesticide composition which is excellent in disintegratability and dispersibility in water.

[0002]

2. Description of the Related Art Among agrochemical formulations, examples of formulations diluted with water and sprayed include emulsions, wettable powders, and flowable agents. Since the emulsion uses an organic solvent as a carrier, there are problems such as toxicity, irritation, flammability and odor. On the other hand, since the wettable powder is a finely powdered formulation, it is inconvenient to measure it, and powdering at the time of preparation of the spray liquid poses a problem. A flowable formulation is a suspension that eliminates the inconvenience of weighing wettable powder and the problem of dusting, but it is a viscous liquid formulation that is difficult to remove from the container, and a small amount of formulation can be used. Since it remains in the container, it may be difficult to dispose of the container.

Therefore, attempts have been made in recent years to granulate wettable powders. Granulating the wettable powder improves the powdering and weighing difficulties of the wettable powder. Further, there is no problem of difficulty in handling due to the high viscosity of the flowable agent.
Various techniques for producing the above-described granulated wettable powder (the above-mentioned water-dispersible granular agricultural chemical composition) have been proposed so far. For example, a method of blending starch and a water-soluble inorganic salt (Japanese Patent Publication No. 53-12577), a method of blending a saccharide, a naphthalenesulfonic acid type surfactant and an alkali metal phosphate (Japanese Patent Laid-Open No. 57-163303). ), A method of combining a sulfate type anionic surfactant and a nonionic surfactant in combination (JP-A-59-19).
3803).

[0004]

However, such a granulated wettable powder cannot obtain good disintegration and dispersibility in water when the pesticidal active ingredient is contained in a high concentration, and It was not always practical because the disintegration property and dispersibility in water deteriorated with time during storage.

[0005]

Therefore, as a result of intensive studies to solve the above-mentioned problems, the present inventor has found that even when the pesticide active ingredient is contained in a high concentration, it has good disintegration properties and dispersion in water. The present invention has been completed by finding a method in which the dispersibility is obtained and the disintegration property and dispersibility in water are not deteriorated with time during storage.

That is, the present invention comprises one or more pesticidal active ingredients, the following surfactant (1) and the following surfactant (2), and is water dispersible. It is a granular pesticide composition. Examples of the surfactant (1) include lignin sulfonic acid, naphthalene sulfonic acid formalin condensate, maleic acid / diisobutylene copolymer, maleic acid / isobutylene copolymer, and their alkali metal salts and alkaline earth metals. One or more surfactants selected from salts, ammonium salts or amine salts can be used. Examples of the surfactant (2) include alkylnaphthalene sulfonic acid, polyoxyethylene alkylphenyl ether sulfate, polyoxyethylene styryl phenyl ether sulfate, and their alkali metal salts, alkaline earth metal salts, ammonium salts or amine salts. One or more surfactants selected from the above can be used.

The content of the surfactant (1) in the agrochemical composition of the present invention is preferably 5 to 30% by weight, more preferably 10 to 20% by weight. The content of the surfactant (2) is preferably 1 to 10% by weight, more preferably 2 to 5% by weight. The agrochemical active ingredient used in the present invention is not particularly limited, but it can be applied to those conventionally used as wettable powders. Typical examples are given below.

As the insecticide, 2-tert-butyl-5- (4-tert-butylbenzylthio) -4-
Chloropyridazin-3 (2H) -one (generic name: pyridaben), 1-naphthyl-N-methylcarbamate (generic name: NAC), 3,7,9,13-tetramethyl-5,
11-dioxa-2,8,14-trithia-4,7,
9,12-Tetraazapentadeca-3,12-diene-
6,10-dione (generic name: thiodicarb), 3-methyl-1,5-bis (2,4-xylyl) -1,3,5-
Triazapenta-1,4-diene (generic name: amitraz), 3,6-bis (2-chlorophenyl) -1,2,
4,5-Tetrazine (generic name: clofentezine), hexakis (β, β-dimethylphenethyl) distannoxane (generic name: fenbutatin oxide), isopropyl 4,4′-dibromobenzylate (generic name: phenisobromolate) ): 2,4′-dichloro-α-as a bactericide
(Pyrimidin-5-yl) benzhydryl alcohol (generic name: phenalimol), 8-hydroxyquinoline copper (generic name: oxine copper), 5-methyl-1,2,4-triazolo [3,4-b] benthazole (Generic name: tricyclazole), 3- (3,5-dichlorophenyl)-
N-isopropyl-2,4-dioxoimidazolidine-
1-carboxamide (generic name: iprodione), N-trichloromethylthiotetrahydrophthalimide (generic name: captan), 2,6-dichloro-4-nitroaniline (generic name: CNA); as a herbicide, ethyl = 5
-(4,6-dimethoxypyrimidin-2-ylcarbamoylsulfamoyl) -1-methylpyrazole-4-carboxylate (generic name: pyrazosulfuron-ethyl),
Methyl 5-[[[[[(4,6-dimethoxy-2-pyrimidinyl) amino] carbonyl] amino] sulfonyl]
-3-Chloro-1-methyl-1-H-pyrazole-4-
Carboxylate ethyl = (RS) -2- [4- (6-chloroquinoxalin-2-yloxy) phenoxy] propionate (generic name: quizalofop-ethyl) 2-chloro-2 ′, 6′-diethyl-N- ( 2-Bropoxyethyl) acetanilide (generic name: pretilachlor), ammonium = DL-homoalanin-4-yl (methyl) phosphinate (generic name: glufosinate), 5-tert-butyl-3- (2,4-dichloro-5). -Isopropoxyphenyl) -1,3,4-oxadiazolin-2-one (generic name: oxadiazone),
Methyl-N- (3,4-dichlorophenyl) carbamate (generic name: MCC), 3-isopropyl-2,1,3
-Benzo-thiadiadinone- (4) -2,2-dioxide (generic name: bentazone), 2,4-dichlorophenoxyacetic acid (generic name: 2,4-D), 2-methyl-4-chlorophenoxyacetic acid ( General name: MCP), 2-methylthio-4,6-bis (isopropylamino) -s-triazine (general name: promethrin), 2-methylthio-4-ethylamino-6-isopropylamino-s-triazine (general name) : Amethrin), 2-chloro-4,6-bis (ethylamino) -s-triazine (generic name: simazine), 2-chloro-4-ethylamino-6-isopropylamino-s-triazine (generic name: atrazine) ) 2
-Methylthio-4,6-bis (isopropylamino)-
Examples include s-triazine (generic name: promethrin). Further, depending on the purpose, the agrochemical active ingredient may be used alone or in combination of two or more kinds.

The content of the agrochemical active ingredient in the agrochemical composition of the present invention is preferably 1 to 90% by weight, more preferably 10 to 80% by weight. The granulated wettable powder of the present invention (the above-mentioned water-dispersible granular pesticide composition) may contain a mineral powder or a water-soluble powder as an extender, if necessary. Mineral powders include diatomaceous earth,
Talc, clay, bentonite, calcium carbonate, etc. are used. As the water-soluble powder, saccharides, urea, various salts and the like are used. Examples of sugars include lactose, fructose and glucose, and examples of salts include sulfuric acid, phosphoric acid,
Examples thereof include an alkali metal salt and an ammonium salt of hydrochloric acid, nitric acid, or carbonic acid. These extenders may be used alone or in combination of two or more.

If necessary, other auxiliary agents such as a binder, a grinding aid, an absorbent, an anti-decomposition agent, a colorant,
A defoaming agent or the like may be added. The granulated wettable powder of the present invention is produced by the following method. That is, the first production method is to add a necessary amount of the agricultural chemical active ingredient, the surfactant (1), the surfactant (2), the bulking agent and other auxiliary agents, mix them evenly, and then pulverize them. .. Fine crushing is an impact crusher,
It can be carried out by a dry crusher such as a ball mill or a jet atomizer. Then, an appropriate amount of water is added to the obtained fine powder, mixed and kneaded, and then granulated using a granulator and dried to obtain the desired product. Granulation can be carried out by a granulator such as an extrusion granulator, a pressure granulator, a fluidized bed granulator, a stirring granulator, a tumbling granulator and the like.

In the second production method, a pesticide active ingredient, a surfactant (1), a surfactant (2), a bulking agent and other auxiliary agents are added to a proper amount of water in a necessary amount, and wet grinding is carried out. Pulverize with a machine. The fine pulverization can be performed by a wet pulverizer such as a ball mill and a sand grinder.
Next, if necessary, an appropriate amount of a surfactant (1), a surfactant (2), a bulking agent and other auxiliary agents are added to the obtained aqueous suspension and mixed, and this is mixed with a spray dryer. The target product can be obtained by spray drying.

As a third production method, a pesticidal active ingredient, a surfactant (1), a surfactant (2), a bulking agent and other auxiliary agents are added to a proper amount of water in a necessary amount, and a wet pulverizer is used. Pulverize with. The fine pulverization can be performed by a wet pulverizer such as a ball mill and a sand grinder. Next, an extender was added to the obtained aqueous suspension together with the surfactant (1), the surfactant (2), and other auxiliary agents, if necessary, to form a paste, which was mixed and kneaded. Then, it granulates using a granulator and is dried, and a target object is obtained. Granulation can be performed by a granulator such as an extrusion granulator, a pressure granulator, a fluidized bed granulator, a stirring granulator, a tumbling granulator and the like.

The particle size of the granulated wettable powder of the present invention is not particularly limited, but is preferably 0.1 to 2 mm.

[0014]

The present invention will now be described with reference to specific examples, but the present invention is not limited to these examples. All parts are parts by weight. Example 1 97 parts of pyridaben (generic name) and 3 parts of white carbon are finely pulverized with a jet atomizer (manufactured by Seishin Enterprise Co., Ltd.). 70 parts of this finely pulverized product, 10 parts of a mixture of a copolymer of maleic acid and diisobutylene and a polyoxyethylene styryl phenyl ether sulfate ester salt, polyoxyethylene alkylphenyl ether ammonium sulfate 2.5
Parts, 5 parts of ammonium sulfate and 12.5 parts of clay were mixed using a mixer, then 30 parts of water were added and mixed, and then granulated using an extrusion type granulator equipped with a screen having a diameter of 0.5 mm. To do. After drying at 50 ° C., the particles are sized with a sieve of 20 to 50 mesh to obtain the granulated wettable powder of the present invention. Example 2 97 parts of pyrazosulfuron-ethyl (generic name) and 3 parts of white carbon were jetted with an atomizer (produced by Seishin Enterprise Co., Ltd.).
Pulverize with. 75 parts of this finely ground product, 10 parts of a mixture of a copolymer of maleic acid and diisobutylene and a polyoxyethylene styryl phenyl ether sulfate ester salt, 2.5 parts of polyoxyethylene alkylphenyl ether ammonium sulfate, 5 parts of ammonium sulfate, and clay 7. After mixing 5 parts using a mixer, 30 parts of water was added and mixed,
Next, granulation is performed using an extrusion type granulator equipped with a screen having a diameter of 0.5 mm. After drying at 50 ° C, 20-50
The particles are sized with a mesh sieve to obtain the granulated wettable powder of the present invention. Example 3 97 parts of pyrazosulfuron-ethyl (generic name) and 3 parts of white carbon are used as a jet atomizer (manufactured by Seishin Enterprise Co., Ltd.).
Pulverize with. 75 parts of this finely ground product, 7 parts of formalin condensate of sodium naphthalene sulfonate, 3 parts of sodium alkylnaphthalene sulfonate and 15 parts of clay were mixed using a mixer, then 15 parts of water was added and mixed, and then the caliber Granulate using an extrusion type granulator equipped with a 0.5 mm screen. After drying at 50 ° C., the particles are sized with a sieve of 20 to 50 mesh to obtain the granulated wettable powder of the present invention. Example 4 97 parts of pyrazosulfuron-ethyl (generic name) and 3 parts of white carbon are used as a jet atomizer (manufactured by Seishin Enterprise Co., Ltd.).
Pulverize with. 75 parts of this finely ground product, 7 parts of formalin condensate of sodium naphthalene sulfonate, 2 parts of sodium lignin sulfonate, 2 parts of sodium alkylnaphthalene sulfonate and 14 parts of clay were mixed using a mixer, and then 15 parts of water were mixed. Add and mix, then caliber 0.5mm
Granulate using an extrusion-type granulator equipped with the screen of. After drying at 50 ° C., the particles are sized with a sieve of 20 to 50 mesh to obtain the granulated wettable powder of the present invention. Example 5 97 parts of quizalofop-ethyl (generic name) and 3 parts of white carbon are finely pulverized with a jet atomizer (manufactured by Seishin Enterprise Co., Ltd.). 75 parts of this finely ground product, 10 parts of a mixture of a copolymer of maleic acid and diisobutylene and a polyoxyethylene styryl phenyl ether sulfate ester salt, 2.5 parts of polyoxyethylene alkylphenyl ether ammonium sulfate, 5 parts of ammonium sulfate, and clay 7. After mixing 5 parts using a mixer, 30 parts of water is added and mixed, and then granulated using an extrusion type granulator equipped with a screen having a diameter of 0.5 mm. After drying at 50 ° C., the particles are sized with a sieve of 20 to 50 mesh to obtain the granulated wettable powder of the present invention. Example 6 55 parts of pyridaben (generic name), 2 parts of a mixture of a copolymer of maleic acid and diisobutylene and polyoxyethylene styryl phenyl ether sulfate ester salt, and 43 parts of water were mixed with a homomixer, and then a sand grinder (IMEX) was used. Milled for 90 minutes to obtain a ground slurry. 74.9 parts of this ground slurry, 13.5 parts of a mixture of a copolymer of maleic acid and diisobutylene and polyoxyethylene styryl phenyl ether sulfate ester salt, 2.5 parts of polyoxyethylene alkylphenyl ether ammonium sulfate, 10 parts of ammonium sulfate, Clay 31.
After mixing 3 parts using a mixer, it granulates using the extrusion type granulator equipped with the screen of 0.5 mm in diameter.
After drying at 50 ° C., the particles are sized with a sieve of 20 to 50 mesh to obtain the granulated wettable powder of the present invention. Example 7 Methyl 5-[[[[[(4,6-dimethoxy-2-pyrimidinyl) amino] carbonyl] amino] sulfonyl]
-3-Chloro-1-methyl-1-H-pyrazole-4-
97 parts of carboxylate and 3 parts of white carbon are finely pulverized with a jet omizer (manufactured by Seishin Enterprise Co., Ltd.). 75 parts of this finely ground product, 7 parts of formalin condensate of sodium naphthalenesulfonate, 2 parts of sodium ligninsulfonate, 2 parts of sodium alkylnaphthalenesulfonate,
After mixing 14 parts of clay using a mixer, 30 parts of water is added and mixed, and then granulated using an extrusion type granulator equipped with a screen having a diameter of 0.5 mm. After drying at 50 ° C., the particles are sized with a sieve of 20 to 50 mesh to obtain the granulated wettable powder of the present invention. Comparative Example 1 97 parts of pyridaben (generic name) and 3 parts of white carbon are finely pulverized with a jet omizer (manufactured by Seishin Enterprise Co., Ltd.). 70 parts of this finely pulverized product, 10 parts of a copolymer of maleic acid and diisobutylene, 5 parts of ammonium sulfate, 15 clay
After mixing the parts using a mixer, 30 parts of water is added and mixed, and then granulated using an extrusion type granulator equipped with a screen having a diameter of 0.5 mm. After drying at 50 ° C, 20 ~
The granulated wettable powder of the present invention is obtained by sizing with a 50-mesh sieve. Comparative Example 2 97 parts of pyrazosulfuron-ethyl (generic name) and 3 parts of white carbon were jetted with an atomizer (manufactured by Seishin Enterprise Co., Ltd.).
Pulverize with. 75 parts of this finely pulverized product, 10 parts of a copolymer of maleic acid and diisobutylene, 5 ammonium sulfate
Parts and 10 parts of clay were mixed using a mixer, and then water 30
Parts are added and mixed, and then granulated using an extrusion type granulator equipped with a screen having a diameter of 0.5 mm. After drying at 50 ° C., the particles are sized with a sieve of 20 to 50 mesh to obtain the granulated wettable powder of the present invention. Comparative Example 3 97 parts of pyrazosulfuron-ethyl (generic name) and 3 parts of white carbon were jetted with an atomizer (manufactured by Seishin Enterprise Co., Ltd.)
Pulverize with. 75 parts of this finely pulverized product, 7 parts of formalin condensate of sodium naphthalene sulfonate, and 18 parts of clay were mixed using a mixer, then 15 parts of water was added and mixed, and then a screen having a diameter of 0.5 mm was attached. Granulate using an extrusion type granulator. After drying at 50 ° C, 20 ~
The granulated wettable powder of the present invention is obtained by sizing with a 50-mesh sieve. Comparative Example 4 97 parts of quizalofop-ethyl (generic name) and 3 parts of white carbon are finely pulverized with a jet omizer (manufactured by Seishin Enterprise Co., Ltd.). 75 parts of this finely pulverized product, 7 parts of polyoxyethylene alkylphenyl ether ammonium sulfate, 5 parts of ammonium sulfate and 13 parts of clay were mixed using a mixer, then 30 parts of water was added and mixed, and then a diameter of 0.5 mm.
Granulate using an extrusion-type granulator equipped with the screen of. After drying at 50 ° C, the particles are sized with a sieve of 20 to 50 mesh to obtain the granulated wettable powder of the present invention. Comparative Example 5 Methyl 5-[[[[((4,6-dimethoxy-2-pyrimidinyl) amino] carbonyl] amino] sulfonyl]
-3-Chloro-1-methyl-1-H-pyrazole-4-
97 parts of carboxylate and 3 parts of white carbon are finely pulverized with a jet omizer (manufactured by Seishin Enterprise). 75 parts of this finely pulverized product, 7 parts of sodium alkylnaphthalene sulfonate, and 18 parts of clay were mixed using a mixer, then 30 parts of water was added and mixed, and then extrusion molding equipped with a screen having a diameter of 0.5 mm. Granulate using a granulator. After drying at 50 ° C, the particles are sized with a sieve of 20 to 50 mesh to obtain the granulated wettable powder of the present invention.

Next, the formulations obtained from the Examples and Comparative Examples were subjected to a water disintegration test and a suspension stability test. Test Example 1 Disintegration test in water 1.0 g of a sample is accurately weighed. Weigh the sample to 20
Pour into a 100 ml graduated cylinder with a ground stopper containing 100 ml of hard water at 3 ° C. After standing for 20 seconds, invert the graduated cylinder once every 2 seconds.
The number of inversions until the granulated wettable powder completely disintegrates is defined as disintegration in water. A value with a small number of inversions is good. The results are shown in Table 1. Test Example 2 Suspension Stability Test 1.0 g of a sample is precisely weighed in a 100 ml beaker, and 50 ml of 3 ° C. hard water at 20 ° C. is added and well mixed and dispersed. Transfer it to a 250ml cylinder with a stopper and add 3
Hard water is added to make 250 ml, and left still for 15 minutes, then 1
Shake vigorously 30 times a minute and let stand for 5 minutes. Next, put a 25 ml hole pipette into the liquid, keep the tip in the center of the liquid, gently take 25 ml of the test liquid, measure the dry constant weight (dry residue) in the test liquid, and obtain the suspension rate from the following formula. ..

Suspension rate (%) = [(B × 10) / A] × 100 A: Weight of sample weighed first accurately B: Weight of dry residue in test solution Large suspension rate is good .. The results are shown in Table 1.

[0017]

The pesticidal composition of the present invention has excellent disintegration properties and dispersibility in water.

Claims (3)

[Claims] 1. One or more pesticide active ingredients,
A water-dispersible granular agricultural chemical composition comprising the following surfactant (1) and the following surfactant (2). (1) Lignin sulfonic acid, naphthalene sulfonic acid formalin condensate, maleic acid / diisobutylene copolymer, maleic acid / isobutylene copolymer, and their alkali metal salts, alkaline earth metal salts, ammonium salts or amines One or more surfactants selected from salts. (2) Alkylnaphthalenesulfonic acid, polyoxyethylene alkylphenyl ether sulfate, polyoxyethylene styryl phenyl ether sulfate,
And these alkali metal salts, alkaline earth metal salts,
One or more surfactants selected from ammonium salts or amine salts. 2. The water-dispersible granular pesticide composition according to claim 1, wherein the surfactant (1) is contained in an amount of 5 to 30% by weight. 3. The water-dispersible granular pesticide composition according to claim 1, wherein the surfactant (2) is contained in an amount of 1 to 10% by weight.