JPH1149602A - Water-soluble pesticide granules - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain the subject granule capable of providing stable controlling effects without adsorbing an agrochemically active ingredient on a carrier after spraying thereof on a paddy field or a farmland by including ammonium sulfate and/or potassium chloride, the agrochemically active ingredient and a specific dextrin therein. SOLUTION: This agrochemical granule is obtained by a method for including (A) preferably powdery ammonium sulfate and/or potassium chloride, (B) an agrochemically active ingredient (e.g. CYAP) and (C) a dextrin having <=30 polymerization degree (preferably maltodextrin), as necessary, adding a surfactant such as a nonionic surfactant (e.g. an alkyl ether) thereto, sufficiently mixing the resultant mixture, providing a powdery raw material composition, adding an adequate amount of water thereto, sufficiently kneading the prepared mixture with a twin-arm kneader, then granulating the obtained kneaded material with a bucket type extrusion granulator, etc., further grading and drying the resultant granule, etc. The amounts of the added ingredients based on the whole granule are preferably 10-95 wt.% ingredient A, 0.1-50 wt.% ingredient B and 5-10 wt.% ingredient C.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water-soluble pesticide granule capable of obtaining a stable control effect without spraying the pesticide active ingredient on a carrier after the pesticide granule is sprayed on a paddy field or a field.

[0002]

2. Description of the Related Art Water-insoluble minerals such as clay, bentonite, talc, and calcium carbonate, which have been conventionally used as carriers for pesticide granules, often adsorb to the pesticide active ingredient, and the effect of the pesticide active ingredient is reduced. It is difficult to fully demonstrate.

In order to solve this problem, many pesticide granules using water-soluble inorganic salts have been studied as carriers that do not adsorb pesticidal active ingredients, and the following water-soluble pesticide granules are known. I have.

(1) Japanese Patent Application Laid-Open No. Sho 56-30901 The pesticidal active ingredient is dissolved or dispersed in a waxy substance, and the pesticidal active ingredient is suspended using a water-soluble or water-dispersible substance as an extender. Granules that can exert their effects for a long time.

(2) Japanese Patent Application Laid-Open No. Sho 60-215035 A sustained-release granule of a biologically active ingredient, which is contained in a matrix of a polyhydroxy polymer, a specific inorganic salt and an optional filler.

(3) Japanese Patent Application Laid-Open No. Sho 60-142901 Powder or mixture of powder and water-soluble carrier, inorganic or organic film having a water dissolution rate lower than that of this water-soluble carrier. A water-floating pesticidal granular composition comprising a forming substance, water and a poorly water-soluble pesticidal active ingredient.

(4) JP-A-63-307802 A process for producing a water-sedimentable water-soluble agricultural chemical base containing water-soluble salts and potassium sulfate in an amount of 20% by weight or more based on the salts.

[0008]

The conventional water-soluble pesticide granules settle at the bottom of the paddy field immediately after being put into the paddy water, but float on the water surface until the water-soluble carrier and the binder are completely dissolved.

[0009] Such water-soluble pesticide granules are useful when the pesticidal active ingredient is more effective in controlling the water when it floats on the water surface than at the bottom of a paddy field. However, in places where pesticide active ingredients are ubiquitous in a part of the paddy field together with the water-soluble carrier due to the effects of water flow, wind, etc., the concentration of the pesticide active ingredient may become abnormally high and harm rice plants. . In addition, in places where the pesticidal active ingredient is not unevenly distributed, there is a problem that the control effect is low. Therefore, the conventional water-soluble pesticide granules are not always satisfactory.

[0010] From the above, there is a need for the development of a water-soluble pesticide granule capable of obtaining a stable control effect without the pesticidal active ingredient being adsorbed on the pesticide granule carrier after the pesticide granule is sprayed on the paddy field or the field. Have been.

[0011]

Means for Solving the Problems The present inventors have made intensive studies to solve these problems. As a result, dextrin having a degree of polymerization of 30 or less (hereinafter, referred to as “low-polymerized dextrin”) and one or both of ammonium sulfate and potassium chloride are blended and mixed with the pesticidal active ingredient, and the mixture is mixed by a conventional method. The present inventors have found that a water-soluble pesticide granule obtained by granulation solves the above-mentioned problems and completed the present invention.

The gist of the present invention resides in a water-soluble pesticide granule comprising ammonium sulfate and / or potassium chloride, an agrochemical active ingredient and dextrin having a degree of polymerization of 30 or less.

The term "degree of polymerization" used herein means an average degree of polymerization.

Hereinafter, the water-soluble pesticide granule of the present invention will be described in detail.

First, ammonium sulfate used in the present invention,
Potassium chloride is used as a carrier for pesticide active ingredients,
It is water-soluble. And these may be used alone, respectively, may be used in combination, in any case,
The amount used is 10 to 95% by weight based on the weight of the preparation.

The ammonium sulfate used in the present invention is:
There are granules and powders, and potassium chloride is granules, granules and powders. These can be used in any shape without any problem, but powders that are easily mixed when mixed with the pesticide raw material and low-polymerized dextrin to be used are preferable.

The pesticidal active ingredients used in the present invention include, for example, the following, which may be used alone or in combination.

Examples of insecticides CYAP, MPP, MEP, diazinon, isoxathion, pyridafenthion, chlorpyrifos, marathon, PAP, dimethoate, hosalon, PMP, DMT
P, prothiophos, pyraclophos, CVMP, DEP,
NAC, MTMC, PHC, XMC, Ethiophencarb, Pirimicarb, Mesomyl, Thiodicarb, Alanicarb, Bifenthrin, Permethrin, Sivermethrin, Cyhalothrin, Fenpropatrin, Tralomethrin, Fenvalerate, Flucitrinate, Fulvalinate, Etofenprox, Cartap, Thiopram Bensultap, diflubenzuron, teflubenzuron, chlorfluazuron, tebufenozide, buprofezin, phenoxycarb, benzoepin, imidacloprid, methaldehyde, quercene, tetradiphone, B
PPS, quinomethionate, hexthiazox, fenbutatin oxide, dienochlor, fenpyroximate,
Debufenpyrad, fluazinam, pyridaben, clofentedine and the like.

Examples of fungicides Basic copper sulfate, basic copper chloride, cupric hydroxide, oxine copper, nonylphenol sulfone copper, copper terephthalate, zineb, maneb, manzeb, polycarbamate, organic nickel, propineb, ziram, Thiuram, thiadiazine, captan, TPN, fusalide, EDDP, tolclofosmethyl, fosetyl, thiophanatemethyl, benomyl, thiabendazole, iprodione, vinclozolin, procymidone, fluoroimide, oxycarboxin, mepronil, flutranil, teclophthalam, pencyclon, metalaxyl, oxadixyl, oxadixylol, oxazixonyl tria , Microbutanyl, hexaconazole, propiconazole, diphenoconazole, ipconazole, imibenconazole, triflumizo ,
Pefurazoate, fenallimole, pyrifenox,
Diathinone, quinomethionate, DPC, diclomedine, triazine, ferimzone, fluazinam, dietofencarb, isoprothiolane, tricyclazole,
Oxolinic acid, iminoctadine acetate, kasugamycin, polyoxin, validamycin A, streptomycin, oxytetracycline, mildiomycin, PCNB, echromezole, chloroneb and the like.

Examples of herbicides 2,4-D, MCP, quizalofop-ethyl, bifenox, IPC, MBPMC, pyributicarb, pretilachlor, metolachlor, tenylchlor, napropamide, diphenamide, propizamide, isoxaben, ashram, DCMU, linuron, siduron , Methyldaimuron, carbbutyrate, isouron, thiazafluron, ethidium diuron, tebutiurone, flazasulfuron, thifensulfuron-methyl, imazosulfuron, metsulfuron-methyl, CAT, atrazine, promethrin, cyanazine, hexazinone, metribuzin, terbacil, bromacil, renacil, PA , Pyridate, oxadiazon, bethrosin, prodiamine, pendimethalin, TCTP, DPA, amiplo Sumechiru, butamifos, glyphosate sodium salt, Piarahosu, ioxynil, DBN, DCBN, alloxydim, ACN, Kurorufutarimu, chlorates, etc. cyanate.

Examples of plant growth regulators Ethephon, indoleacetic acid, ethiclozeate, cloxyhonac, dichlorprop, 1-naphthylacetamide, 4-CPA, benzylaminopurine, forchlorphenyutron, choline, gibberellin and the like.

The amount of these pesticidally active ingredients to be added to the preparation is not particularly limited, but is generally 0.1 to 50% (% by weight) of the total amount. Therefore, it may be added so that the required treatment amount per 10 ares is obtained.

The names of these pesticidal active ingredients are the common names described in the "Agrochemical Handbook 1994 Edition" (published by the Japan Plant Protection Association).

The low-polymerized dextrin used as a binder in the present invention includes natural starches such as wheat starch, potato starch and corn starch, various starches such as amylose and amylopectin degradation products, etherified starch and esterified starch, and derivatives thereof. Among the dextrins obtained by hydrolyzing according to a conventional method by acid hydrolysis, alkali hydrolysis, enzymatic hydrolysis, or a combination thereof, a low-polymerized dextrin having a degree of polymerization of 30 or less is obtained by a conventional method. . The degree of polymerization mentioned here may be measured by a conventional method such as a 3,5-dinitrosalicylic acid method.

Commercial products containing the low-polymerized dextrin can be used.

The dextrin used in the water-soluble pesticide granule of the present invention has higher water solubility than ammonium sulfate, and a low-polymerized dextrin having a polymerization degree of 30 or less is preferred. Preferably, the degree of polymerization is 15 or less, particularly preferably 10 to 3.

Examples of these include those called maltodextrin, acrodextrin, erythrodextrin and the like, with maltodextrin being preferred. More specifically, the product names “Amicol No. 6H”, “Amicol No. 1”, “Amicol N”
o. 3L "(trade name, manufactured by Nisset Chemical Co., Ltd.) and the like.

The amount of the low-polymerized dextrin used is 3 to 20% by weight, preferably 5 to 10% by weight, based on the weight of the preparation.

Surfactants can be blended as required, and are used in the following agricultural chemical formulations: nonionic surfactants, anionic surfactants, cationic surfactants and amphoteric surfactants. Agents and the like. These surfactants may be used alone or in combination.

Examples of nonionic surfactants: alkyl ether, polyoxyethylene alkyl aryl ether, polyoxyethylene styryl phenyl ether, polyoxyethylene alkyl ester, polyoxyethylene sorbitan alkylate, polyoxyethylene phenyl ether polymer, polyoxy Ethylene alkylene glycol, polyoxyethylene polyoxypropylene block polymer and the like.

Examples of anionic surfactants Lignin sulfonate, alkyl aryl sulfonate, dialkyl sulfosuccinate, polyoxyethylene alkyl aryl ether sulfate, alkyl naphthalene sulfonate, polyoxyethylene styryl phenyl ether sulfate and the like.

Examples of cationic surfactants and amphoteric surfactants Alkylamine salts, quaternary ammonium salts alkylbetaines, amine oxides and the like.

Examples of auxiliary agents that may be added as required include stabilizers for the raw material, granulation assistants added for improving granulation properties, and oil-absorbing retention agents such as white carbon. These can be used in combination.

Next, the method for preparing the water-soluble pesticide granules of the present invention will be described. However, the preparation method is not particularly limited. It can be prepared by a dynamic granulation method or the like. As an example, in the case of the extrusion granulation method, it can be prepared, for example, by a method comprising the following steps.

Step: Add ammonium sulphate and / or potassium chloride, a pesticidal drug substance, low polymerization dextrin, and if necessary, an auxiliary agent such as a surfactant, and mix well.
A powdered raw material composition is obtained.

Step: An appropriate amount of water is added to the powdery raw material composition, the mixture is kneaded well in a double-arm kneader, and then granulated by a basket-type extrusion granulator.

Step: After granulation, sizing and drying are performed and sieved to obtain a water-soluble pesticide granule of the present invention.

[0038] In the water-soluble pesticide granules of the present invention, the particle size of the granules is not particularly limited, and in addition to the shapes generally called granules in the field of agrochemical formulations, tablets, pills and the like Any one of

The method of using the water-soluble pesticide granules of the present invention thus obtained, such as the method of spraying, may be in accordance with conventionally available granules.

The water-soluble pesticide granules of the present invention are more easily disintegrated by water such as dew on the soil surface of the field, in the soil, or on the leaves than the conventional granules, and at the same time, the pesticidal active ingredient becomes a carrier. Since it is released without being adsorbed and a stable control effect is obtained, and there is no phytotoxicity to crops, it can be applied to the field.

Next, the water-soluble pesticide granules of the present invention will be specifically described with reference to Examples, but the present invention is not limited thereto.

In the examples, "part" means "part by weight".

Example 1 21 parts of a biphenox raw material, 10 parts of a low-polymerized dextrin (degree of polymerization: about 9 to 11) (trade name “Amicol No. 6H” of Nissen Chemical Co., Ltd.), ammonium sulfate (manufactured by Sumitomo Chemical Co., Ltd.) ) 69 parts are mixed together by a hammer mill (manufactured by Fuji Paudal Co., Ltd.) to obtain a powdery raw material composition. This powdery raw material composition is put into a double-arm kneader (manufactured by Fuji Paudal Co., Ltd.), 6 parts of water is added, and the mixture is kneaded well. The resulting mixture was granulated, sized and dried to obtain a water-soluble pesticide granule.

Example 2 21 parts of a bifenox raw material, 10 parts of a low-polymerized dextrin (degree of polymerization: about 5 to 6) (trade name “Amicol No. 1” of Nisseki Chemical Co., Ltd.), sodium ligninsulfonate (Nippon Paper Industries Co., Ltd.) Company name "Sun Extract P25
2)) 1.0 part and 68 parts of potassium chloride are mixed together by a hammer mill to obtain a powdery raw material composition. This powdery raw material composition was put into a double-arm kneader, and 6 parts of water was added and kneaded well, followed by a 1 mm basket-type extrusion granulator.
After granulation, sizing and drying, a water-soluble pesticide granule was obtained.

Comparative Example 1 10 parts of the low-polymerized dextrin of Example 1 was changed to 5 parts of carboxymethylcellulose (trade name “Selogen 7A” manufactured by Daiichi Kogyo Co., Ltd.), and 69 parts of ammonium sulfate was replaced with 74 parts.
The same procedure was followed as in Example 1 to obtain a water-soluble pesticide granule.

Comparative Example 2 Except that 10 parts of the low-polymerized dextrin of Example 1 was changed to 10 parts of yellow dextrin (degree of polymerization: about 32 to 34) (trade name “Akadama dextrin No. 102” manufactured by Nisseki Chemical Co., Ltd.). Prepared according to Example 1 to obtain water-soluble pesticide granules.

Comparative Example 3 10 parts of the low-polymerized dextrin of Example 1 was changed to 3 parts of polyvinyl alcohol (trade name “Gohsenol GL-05S” of Nippon Synthetic Chemical Co., Ltd.), and ammonium sulfate 69 was added.
A water-soluble pesticide granule was prepared in the same manner as in Example 1 except that the amount was 76 parts.

Comparative Example 4 A water-soluble pesticide granule was prepared in the same manner as in Example 2, except that 10 parts of the low-polymerized dextrin in Example 2 was changed to 10 parts of corn starch.

Comparative Example 5 Preparation was attempted in the same manner as in Example 1 except that 69 parts of ammonium sulfate in Example 1 was changed to urea. However, after granulation, it could not be dried and water-soluble pesticide granules could be obtained. Did not.

Next, the usefulness of the water-soluble pesticide granules of the present invention will be described by test examples.

Test Example 1 (Measurement of physical properties of water-soluble pesticide granule) 1000 ml of 450 ml (about 5 cm depth) of 3rd hard water was added.
About 15 mg of the granules prepared in accordance with Examples 1 and 2 and the granules were placed in a beaker having a capacity of ml, and the behavior from when the granules began to be submerged and dissolved until the particles were completely dissolved was confirmed.

For comparison, Comparative Examples 1 to 4 and each granule prepared according to these were measured in the same manner as in Examples 1 and 2.

As a control, a commercially available bifenox granule as a control was also measured in the same manner.

Table 1 shows the obtained results.

Test Example 2 (Herbicidal Effect Test) On the whole surface of a paddy field where paddy was performed, seeds of barnyard grass, oak, and azalea were respectively 5 g, 0.5 g, and 0.1 g per 10 m ² .
1 g was seeded. Four days after shaving, rice was transplanted with a transplanter, and after transplantation, a test plot of 49 m ² (7 × 7 m) was established in one plot. At 7 days after transplantation (1.0-leaf stage) and 10 days after transplantation (1.5-leaf stage), the granules prepared in Examples 1-2 were placed in a test plot in a flooded state (flooding depth 3-5 cm). 3 kg was sprayed uniformly per 10a. For comparison, each of the granules prepared in Comparative Examples 1 to 4 and, as a control, commercially available bifenox granules were sprayed in the same manner.

Investigations were conducted 10 days after the treatment with respect to the phytotoxicity of rice (leaf sheath browning) and 30 days after the treatment with respect to the herbicidal effect at 5 points in each test plot shown in FIG. The chemical damage was calculated for each plant type, and the rice damage was measured by measuring the plant height and the number of stems per plant for each of the 10 plants at each survey point, and calculating the ratio (%) to the untreated plot. The degree of leaf sheath browning was investigated according to the following criteria. The wind direction and wind speed at the time of spraying the medicine were an average wind speed of about 3 m / s in the direction from the following investigation point at the time of spraying 7 days after transplantation, and an average wind speed of 4 m / s in the direction at the time of spraying 10 days after transplantation. The test was conducted in two groups in one section.

[0057]

FIG.

[0058]

(Equation 1)

Degree of leaf sheath browning-: No leaf sheath browning ±: Slightly leaf sheath browning is observed +: Leaf sheath browning is clearly observed ++: Leaf sheath browning reaches upper leaves

Table 2 shows the obtained results.

[0061]

[Table 1]

[0062]

[Table 2]

[0063]

When the water-soluble pesticide granule of the present invention is sprayed on a paddy field, the granule is submerged in water and then dissolved while being settled in water. Is not adsorbed on the pesticide granule carrier, a stable control effect is obtained, and there is no harm to rice.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification code FI C05D 1/02 C05D 1/02 C05G 3/02 C05G 3/02

Claims (1)

[Claims] 1. A water-soluble pesticide granule comprising ammonium sulfate and / or potassium chloride, an agrochemical active ingredient and dextrin having a degree of polymerization of 30 or less.