JP2970865B2 - Improved solid pesticide formulation - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a solid agricultural chemical formulation applied to a paddy field for controlling pests, weeds, etc. which occur in the paddy field and the like. More specifically, the present invention relates to a pesticidal solid preparation which, when applied to a paddy field or the like, allows the pesticidal active ingredient to uniformly float on the water surface and develop, thereby effectively controlling pests.

[0002]

2. Description of the Related Art Conventionally, many studies have been conducted on floating pesticidal solid preparations on the water surface of paddy fields. Above all, in the field of agricultural pesticides, utilizing the property of insects coming down on the water surface or coming in and out of the water surface, the active ingredient is floated on the water surface, and how the pests come into contact with more active ingredients Such research has been conducted for a long time.

As a study of floating pesticides, for example, a method is used in which a pesticide active ingredient is held on a light carrier such as foamed obsidian or pumice, which floats on water, and the granules themselves are floated (Japanese Patent Publication No. 44-19764).
Nos. 8600, 47-1240 and 48-1
Nos. 181 and 48-1182, Tokuhei 2-5
No. 6323), a method in which an active ingredient is retained in plastic granules having a specific gravity of 1 or less, and the granules themselves are floated (Japanese Patent Publication Nos. 45-9560, 48-1180, and 4).
9-24222, JP-A-55-139308), a method in which an active ingredient and a floating substance are coated on a solid sedimentary substance, and the active ingredient is suspended in water (Japanese Patent Publication No. 48-1).
Nos. 5613 and 58-26882), a method in which a waxy substance and an agricultural chemical active ingredient are held on a water-soluble carrier (Japanese Patent Publication No. 58-28841, Japanese Patent Application Laid-Open No. 57-387).
No. 02), a method of using a carbonate and a solid acid for a part of the granules to generate carbon dioxide gas, float the granules by the force, and spread the active ingredient on the water surface (Japanese Patent Publication No. 47-27930). A method in which a poorly water-soluble or water-insoluble pesticidal active ingredient is held on a water-soluble carrier and a film-forming substance on a solid carrier (JP-A-63-30281, JP-A-3-261).
701), a method in which a poorly water-soluble or water-insoluble pesticidal active ingredient and a high-boiling solvent are held on a carrier (Japanese Patent Laid-Open No. Sho 6).
JP-A-3-17802), a method in which a liquid alkylbenzene having an alkyl group of C25 or less is mixed with a difficult to water-insoluble pesticidal active ingredient and a solid carrier (Japanese Patent Laid-Open No. 3-2793).
No. 02), a poorly water-soluble or water-insoluble pesticide active ingredient,
A method in which a hard-water-soluble or water-insoluble high-boiling solvent having a specific gravity of 1 or less and a surfactant having an HLB of 6 or less are held on a solid carrier (JP-A-1-254604), which is substantially insoluble in water. (JP-A-7-1075), which is previously dissolved in the above-mentioned esters and mixed with other components.

[0004] However, in the above-mentioned prior art, the pesticidal active ingredient has a poor floating rate on the water surface, or even if it floats, the spreading of the pesticide active ingredient on the water surface is poor, so that a sufficient control effect cannot be obtained. It is not always a satisfactory technology.

[0005]

Heretofore, when a granule was sprayed on a paddy field, the floating rate of the pesticidal active ingredient on the water surface of the paddy field and the spreadability of the water surface after floating on the water surface were poor, and the control effect was poor. It may not be able to fully demonstrate. Also, in the case of herbicides, depending on the difference in the absorption site of the active ingredient, floating the herbicidal active ingredient on the surface water may show a higher effect, but the floating and spreading properties are still insufficient. It cannot be said that it has been improved.

In the present invention, the improvement of the floating rate of the pesticidal active ingredient on the surface of the rice paddy surface, the pesticidal active ingredient floating on the water surface spreads well on the water surface, and the more effective pest control and herbicidal effects are obtained. The aim is to develop new solid agricultural chemicals that can be used.

[0007]

Means for Solving the Problems The present inventors have intensively studied to solve these problems. As a result, it is selected from fatty acid esters, mineral hydrocarbon oils or synthetic non-drying oils which are poorly water-soluble or water-insoluble and have a specific gravity of 1 or less even when the required amount of the pesticidal active ingredient is dissolved, and have a boiling point of 150. Dissolve the pesticide active ingredient in a high boiling point solvent
After mixing a nonionic surfactant with B of 8 or more, a water-soluble polymer compound and a mineral fine powder are mixed and adsorbed, and the pesticidal solid preparation obtained by granulation easily has the above-mentioned problems. Have been found, and the present invention has been completed.

The solid pesticide preparation of the present invention is treated in a paddy field, then disintegrates in paddy water, and a mixture of the pesticide active ingredient and the high boiling solvent is released from the solid preparation such as granules by the action of a surfactant. Surface and then immediately spread out on the water surface.

The dosage form of the solid agricultural chemical formulation according to the present invention is not particularly limited, and may be any shape as long as it is solid, such as ordinary granules, pills and tablets, and its size is not limited.

[0010] As a method for producing this solid agricultural chemical preparation, an extruder-type granulator or a machine generally called a rolling granulator is used.

The amount and method of spraying of the solid agricultural chemical preparation obtained in the present invention may be in accordance with the usual method for controlling the contained agricultural chemical active ingredient.

[0012]

According to the present invention, the effect is remarkably exhibited in the case of agricultural fungicides, insecticides, and herbicides in which the active agricultural chemical floats and spreads on the water surface of the rice field and exerts its effect.

[0013] The pesticidal activity of a poorly water-soluble or water-insoluble, high-boiling solvent such as a fatty acid ester, a mineral hydrocarbon oil or a synthetic non-drying oil having a specific gravity of less than 1 with a required amount of the pesticidal active ingredient dissolved therein. The components are dissolved, and the high-boiling solvent in this case acts to float the pesticidal active ingredient on the rice paddy water surface. The nonionic surfactant having an HLB of 8 or more acts to improve the floating rate of the solid pesticide formulation on the water surface of the rice field, and also acts to form a uniform oil film on the water surface of the rice field.

[0014] The floating pesticidal solid preparation of the present invention disintegrates quickly in paddy water after treatment on the paddy surface,
The mixture of the pesticidal active ingredient and the high boiling point solvent floats on the water surface at a very high rate, and the spreadability on the water surface of the rice field is also very good.

[0015]

EXAMPLE The composition of the improved solid pesticide preparation of the present invention is not particularly limited except for the pesticidal active ingredient, a high boiling solvent, a surfactant, a water-soluble polymer compound, and a fine mineral substance powder. , An oil-absorbing substance, a pesticide active ingredient stabilizer, a physical property improver, and the like.

The pesticidal active ingredient of the present invention is not limited to a specific one as long as it exhibits a controlling activity in the method of use of the present invention, and any one of them can be used. These include:

Examples of fungicides : Validamycin A, Flutranil, Pencyclone, Diclomedin, Flamethopyr, Thifluzamide and the like.

Examples of insecticides MPP, MEP, diazinon, isoxathion, pyridafenthion, chlorpyrifosmethyl, bamidione, PAP, dimethoate, ethylthiomethone, hosalon, PMP, monocrotophos, dimethylvinphos, propaphos, acephate, DEP, EPN, NAC, MT
MC, MIPC, BPMC, PHC, XMC, Ethiophenecarb, Bendiocarb, Carbosulfan, Benfuracarb, Mesomyl, Oxamyl, Thiodicarb,
Cycloprothrin, etofenprox, cartap, thiocyclam, bensultap, tebufenozide,
Buprofezin, imidacloprid, silafluofen, O-ethyl-O- (N-methoxyacetimidoyl) -phenylthionophosphonic acid ester (Compound A), and the like.

Examples of herbicides cyhalofop butyl, dithiopyr, and the like.

The amount of these pesticidally active ingredients to be added to the preparation is not particularly limited, but is generally 0.05 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 general names of these pesticidal active ingredients are as follows:
These are described in, for example, "Agrochemical Handbook 1994 Edition (issued by the Japan Plant Protection Association)."

The high-boiling solvent having a boiling point of 150 ° C. or higher which is hardly water-soluble or water-insoluble in the present invention may have a water solubility at 20 ° C. of 1 W / W% or less. And one or more of them can be used in combination.

Examples of fatty acid esters : isobutyl oleate, lauryl oleate, oleyl oleate, dimethyl adipate, dioleyl adipate, diisobutyl adipate, diisodecyl adipate, diethyl phthalate, dibutyl phthalate, di-2-ethylhexyl phthalate Didecyl phthalate, ditridecyl phthalate, tri-2-ethylhexyl trimellitate, triisodecyl trimellitate, 3-methoxybutyl acetate, 2-ethylbutyl acetate, 2-ethylhexyl acetate, cyclohexyl acetate, and the like.

Examples of mineral hydrocarbon oils include isoparaffin, liquid paraffin and the like.

Examples of synthetic drying oils such as polybutene.

The amount of the high-boiling solvent used is such that the specific gravity is less than 1 even after dissolving the pesticidal active ingredient, and that the high-boiling solvent in which the pesticidal active ingredient is dissolved is required to float on the rice paddy water surface. Any amount may be used, but preferably, the agricultural chemical active ingredient: high boiling point solvent = 1: 3 to 50 in weight ratio.

As the nonionic surfactant to be incorporated in the present invention, any nonionic surfactant which is generally used in agricultural chemicals and has an HLB of 8 or more can be used. Can be

Alkyl ether, polyoxyethylene alkyl aryl ether, polyoxyethylene styryl phenyl ether, polyoxyethylene alkyl ester, polyoxyethylene sorbitan alkylate, polyoxyethylene phenyl ether polymer, polyoxyethylene alkylene aryl phenyl ether, polyoxy Ethylene alkylene glycol, polyoxyethylene polyoxypropylene block polymer and the like,
One type or two or more types can be used in combination.

The amount of these nonionic surfactants added is
If the amount is too small, the high-boiling solvent in which the pesticide active ingredient is dissolved does not separate from the granule, and the water surface floating rate of the pesticide active ingredient decreases,
If the amount is too large, the high-boiling solvent in which the pesticidal active ingredient is dissolved is emulsified in the paddy water. The amount added to the granules of the present invention varies depending on the type of the pesticidal active ingredient, the high boiling point solvent and the nonionic surfactant used, but is 0.01% or more, preferably 0.1% or more.
~ 5%.

The water-soluble polymer compound used in the present invention is not particularly restricted but includes polyvinyl alcohol, starch, oxidized starch, etherified starch, starch hydrolyzate, dextrin, carboxymethyl cellulose, hydroxypropyl cellulose, hydroxyethyl cellulose, Examples include hydroxypropyl methylcellulose, sodium alginate, sodium ligninsulfonate, calcium ligninsulfonate and the like.

The mineral carrier used in the present invention includes:
Carriers usually used for pesticide powders and granules, such as kaolin, clay, quartzite clay, talc, bentonite, and calcium carbonate, are used. These may be used alone or in combination of two or more.

The use in the present invention is not essential, but if it becomes necessary to increase the oil absorbing ability, it is preferable to use an oil absorbing substance. Examples thereof include zeolite, radiolite, perlite, vermiculite, amorphous hydrated silicic acid, and the like. These may be used alone or in combination of two or more.

The method for preparing the pesticidal solid preparation of the present invention is not particularly limited.
It can be prepared by an extrusion granulation method, a rolling granulation method, or the like. For example, it can be prepared by a method comprising the following steps:

Step A pesticidal active ingredient, the high-boiling solvent of the present invention and a surfactant are mixed and mixed to obtain a liquid raw material composition.

Step: The liquid raw material composition is mixed and adsorbed well with the water-soluble polymer compound of the present invention and mineral powder to obtain a powdery raw material composition.

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, the resulting mixture is sized, dried, and sieved to obtain the improved solid agricultural chemical preparation of the present invention.

Next, the present invention will be described more specifically with reference to examples, but the present invention is not limited to these examples.

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

Example 1 (Granules) 2.0 parts of compound A, 10.0 parts of liquid paraffin and polyoxyethylene styryl phenyl ether (HL)
B = 10.0) 0.2 parts were mixed and mixed, and 10.0 parts of amorphous hydrous silicic acid, 10.0 parts of starch hydrolyzate, 0.5 part of sodium lauryl sulfate and 67.3 parts of clay were put together. To obtain a raw material composition in the form of a solid powder. This solid powdery raw material composition was put into a double-arm kneader, and 12 parts of water was added thereto, and the mixture was kneaded well with a double-arm kneader. Then, the mixture was granulated with a 1.0 mm basket-type extrusion granulator, and sized. It was dried to obtain 100 parts of the pesticide granule of the present invention.

Comparative Example 1 (Granules ) 0.2 parts of polyoxyethylene styryl phenyl ether (HLB = 10.0) of Example 1 was changed to a nonionic surfactant having an HLB of less than 8, and the others were used. Prepared in the same manner as in Example 1 to obtain 100 parts of pesticide granules.

Comparative Example 2 (Granules) Prepared in the same manner as in Example 1 except that 10.0 parts of the liquid paraffin of Example 1 was changed to 0 parts, and 67.3 parts of clay was changed to 77.3 parts. Thus, 100 parts of pesticide granules were obtained.

Comparative Example 3 (Granules) 0.2 parts of polyoxyethylene styryl phenyl ether (HLB = 10.0) of Example 1 was reduced to 0 parts, and 67.3 parts of clay was reduced to 67.5 parts. The preparation was carried out in the same manner as in Example 1 except for the above, and 100 parts of pesticide granules were obtained.

Example 2 (Granules) 2.0 parts of MEP, 10.0 parts of liquid paraffin and polyoxyethylene styryl phenyl ether (HLB)
= 10.0) 0.2 parts were mixed and mixed, and Radiolight was mixed.
15.0 parts, starch hydrolyzate 10.0 parts and clay 62.8 parts were prepared in the same manner as in Example 1 to obtain 100 parts of the pesticide granule of the present invention.

Example 3 (granules) 0.4 parts of dithiopyr, 5.0 parts of isoparaffin [trade name: IP Solvent 2835 of Idemitsu Petrochemical Co., Ltd.] and polyoxyethylene oleyl ether (HLB =
8.8) 0.5 part was miscible mixed, and starch hydrolyzate 1
0.0 part, 0.5 part of sodium lauryl sulfate and 83.6 parts of clay were prepared in the same manner as in Example 1 to obtain 100 parts of the pesticide granule of the present invention.

Example 4 (granules) Flutranil 2.0 parts, diisodecyl adipate 1
67. A mixture of 0.0 part and 1.0 part of polyoxyethylene nonylphenyl ether (HLB = 15.7) is miscible mixed, and 10.0 parts of amorphous hydrous silicic acid, 10.0 parts of sodium ligninsulfonate and clay 67. 0 parts in Example 1
To obtain 100 parts of the pesticide granule of the present invention.

Next, Test Examples 1 and 2 demonstrate that the pesticidal active ingredient of the solid pesticide solid preparation of the present invention has an improved floating rate on water and a water surface coverage.

Test Example 1 Test of the floating rate of the pesticide active ingredient on the water surface
Petri dish of test φ9cm put 3 times hard water 110 ml (to the upper edge of the dish), the pesticide particle powder prepared in accordance with Examples 1-4, uniformly granule application the amount of 12mg corresponding pesticidally active ingredient. The petri dish is left in a dark room at 25 ° C. for 24 hours, and the oil floating on the water surface is overflowed to a large petri dish of 12.5 cm in diameter while gradually adding 40 ml of 3 degree hard water to collect oil. Next, the collected overflow water was transferred to a 100-ml volumetric flask, and the inside of the large petri dish was washed into the volumetric flask with 20 ml of acetonitrile. Further, 30 ml of acetonitrile was added. It was measured. The amount of floating of the pesticide active ingredient calculated from the measured value, and the concentration of the pesticide active ingredient when the total amount of the pesticide active ingredient in the test granules floated on the water surface of the petri dish were theoretically 120 p.
pm (12 mg / 100 ml), the water surface floating rate of the pesticide active ingredient from the pesticide granule was calculated.

For comparison, Comparative Examples 1 to 3 were treated in the same manner as in Examples 1 to 4, and a test for the levitation rate on water was performed.

Test Example 2 Water Coverage Ratio Test of Pesticide Active Ingredients
Put 3 ° hard water 100ml petri dish of test Fai9cm, pesticides granules 3 kg / 10a corresponding amount prepared in accordance with Examples 1-4, uniformly granule application. The petri dish was allowed to stand at 25 ° C. for 6 hours, and the total area of the oil containing the pesticidal active ingredients floating on the water surface was visually observed to see how much the area of the petri dish water surface was increased. %, 20-40
%, Less than 40 to 60%, less than 60 to 80%, 80 to
The evaluation was made in five steps of 100%.

For comparison, Comparative Examples 1 to 3 were treated in the same manner as in Examples 1 to 4, and a water surface coverage test was performed.

The test results obtained are summarized in Table 1.

From the test results 1 and 2 in Table 1,
The high water surface surfacing rate and water surface coverage of pesticide active ingredients
From the comparison between the Example and Comparative Example 1, it was found that the nonionic surfactant H
When LB is 8 or more, from the comparison between Example and Comparative Example 2, from the comparison between Example and Comparative Example 3 when a high boiling point solvent is contained, the preferred amount of nonionic surfactant added is 0.05%.
It turns out that it is above.

Next, Test Example 3 demonstrates in Example 1 and Comparative Examples 1 to 3 that the pesticidal action of the pesticidal granules of the present invention when treated with water was improved.

Test Example 3 Test for biological effect of granules 3 kg of paddy field soil was placed in a Wagner pot having a surface area of 1 / 5,000 and filled with water. Rice paddy (variety: Nihonbaru, 3-4 leaf stage)
5 seedlings were transplanted at the center of each pot. Rice transplant 2
One day later, the pesticide granules prepared according to Example 1 are uniformly dispersed in a pot by an amount equivalent to 3 kg per 10 ares,
10 female adult adults of the brown planthopper are released into each pot,
After 1 day, 3 days, and 7 days, the number of live and dead insects was examined to calculate the mortality.

The test was carried out in one pot, one pot and three consecutive tests.

For comparison, the granules prepared in Comparative Examples 1 to 3 were treated in the same manner as in Example 1, and as a control, a non-treated section where no drug was treated was set, and a biological effect test was performed.

The test results obtained are summarized in Table 1.

As can be seen from the test results 3 in Table 1, the mortality rate in the treated pesticide granules prepared according to Example 1 of the present invention was 100% one day after the treatment, indicating that And high insecticidal power was recognized. Also, the water surface levitation rate,
The insecticidal powers of Comparative Examples 1 to 3 having poor water surface coverage were low.

[0060]

[Table 1]

[0061]

The following effects are obtained by using the improved pesticidal solid preparation of the present invention. Compared with the conventional granules, the floating rate of the pesticidal active ingredient on the water surface of the paddy field and the water surface spreadability after floating on the water surface are remarkably improved, so that the control effect can be sufficiently exerted. As compared with the conventional method of spraying powders, wettable powders, sols, and the like on paddy fields, the adverse effects on the surroundings due to the scattering are dramatically reduced. The conventional techniques can be used as they are for the method for producing pesticide granules and the method for treating chemicals of the present invention.

Continuation of the front page (51) Int.Cl. ⁶ Identification symbol FI A01N 57/14 A01N 57/14 E 57/22 57/22 D (56) References JP-A-5-65201 (JP, A) JP-A 7-101805 (JP, A) JP-A-7-165504 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) A01N 25/08-25/30 A01N 37/46 A01N 57 / 14-57/22 WPI / L (QUESTEL)

Claims (1)

(57) [Claims] (1) A pesticidal active ingredient (b) Fatty acid ester, mineral hydrocarbon oil or synthetic non-drying oil which is hardly water-soluble or water-insoluble and has a specific gravity of 1 or less when containing the pesticidal active ingredient A high-boiling solvent having a boiling point of 150 ° C. or more, (c) a nonionic surfactant having an HLB of 8 or more, (d) a water-soluble polymer compound, and (e) a mineral powder. Improved pesticide solid formulation.