JPH05155703A - Preparation of traveling agent on water surface - Google Patents

Abstract

PURPOSE:To obtain the subject preparation horizontally traveling even applica tion to local part on water surface in a paddy field, having excellent spreadability by coating granular nuclei having an apparent specific gravity lower than a given value surrounded by a component of agricultural chemical and a substance to deteriorate an interfacial tension of air and water with an oily substance. CONSTITUTION:Granular nuclei (e.g. pumice) having an apparent specific gravity of <1.0 are surrounded by an active ingredient of agricultural chemical such as 2-benzothiazol-2-yloxy-N-methylacetanilide and preferably 1-20wt.% substance such as an alkylbenzenesulfonate to change an interfacial tension of air and water and are wated with an oily substance such as paraffin to give the objective preparation. 10-200g unit of the preparation is packed with a water-soluble film such as PVA and molded into a spherical, discoidal, cylindrical, rectangular or cubic shape to give the objective preparation of agricultural chemical.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a pesticide formulation which, even when applied topically to the surface of a paddy field, travels on the surface of the water and immediately spreads over the entire surface, so that the active ingredient of the pesticide is rapidly and evenly eluted in the paddy water. Is provided.

[0002]

[Prior Art and Problems] The main types of pesticides applied to paddy fields are powders, granules, wettable powders, flowable agents, water solvents,
Liquid formulations, emulsions, etc. The amount of granules used is increasing due to an increase in labor saving and consideration for the environment. Even with this granule,
The range in which the pesticide active ingredient contained in one particle diffuses is limited. As a result, the sprayer may have to enter the paddy field and be reluctant to do so. In recent years, further labor saving in application has been required, and the amount of granules applied has been reduced (30
From kg / ha spraying to 10 kg / ha spraying), the development of mechanical spraying and large-scale throwing formulation is required. By throwing the large-sized throwing formulation from the shore without entering the paddy field,
It is a formulation intended to have a pesticide active ingredient evenly distributed in paddy water. Specifically, water-soluble excipients and foaming agents were used to facilitate the dispersion of the active ingredient of agricultural chemicals in paddy water.
g or 50 g tablets, balls, individual packaging, etc. have been tested. However, compared to ordinary granules, they are extremely applied topically, so it actually takes a long time for the active ingredients of the pesticide to be evenly dispersed in the paddy water, or the pesticide is effective in the entire paddy water. The ingredients may not spread. As a result, the effect becomes uneven, and drug damage occurs. As described above, the large-sized throwing-in formulation proposed for labor saving of application encounters the further difficulty of quickly and uniformly distributing the pesticide active ingredient in the paddy water, and solves the problem. Is an urgent need for formulation researchers.

[0003]

[Means for Solving the Problems] Under the circumstances, the inventors of the present invention have conducted extensive studies, and as a result, floated the applied pesticide formulation on the water surface and allowed it to run to uniformly distribute the pesticide active ingredient over the entire rice field. It succeeded in being able to make it and reached this invention. That is, the present invention is characterized in that a grain nucleus having an apparent specific gravity (* footnote) smaller than 1 is coated with an oily substance as a pesticide active ingredient and a substance that changes the air / water interfacial tension, and spreads while traveling on the water surface. The pesticide formulation, the pesticide formulation prepared by packaging the pesticide formulation in a water-soluble film in units of 10 to 200 g, or the pesticide formulation
The present invention relates to a pesticide formulation which is formed into a spherical shape, a columnar shape, a disk shape, a rectangular parallelepiped, or a cube of 200 g. (*footnote:
It is a value obtained by dividing the mass (g) of a single particle having voids inside by the volume (cc) with voids, which is different from the bulk specific gravity. )

More specifically, in the preparation according to the present invention, the surfactant is not attached to the entire surface of the particle nucleus but is partially attached to the surface, so that the interfacial tension of water around the preparation varies depending on the direction. Therefore, the formulation applied to the paddy field first runs on the water surface with less resistance and lateral dispersion occurs, and further, the pesticide active ingredient is eluted from the water surface to the entire paddy water. In other words, the active ingredient of agricultural chemicals is better distributed by dispersing from the whole surface of the water rather than from a single point on the rice field. Moreover, since the formulation is self-propelled, even if this formulation is sprinkled on one point, the entire rice field can be treated. When the formulations of the present invention are applied to paddy fields, the individual formulations run in random directions on the water surface as the substances that change the interfacial tension are dissolved, and as a result, the particles disperse very rapidly and uniformly on the paddy field. The pesticide active ingredient disperses and dissolves in the paddy water as the formulation runs. Since the release of the pesticidal active ingredient from the preparation is extremely fast, even if the grain nuclei are blown to the water surface by the residual wind, the pesticide active ingredient does not remain at that time and the effect does not vary. In addition, there is no danger of drug damage. Granules are considered to be most suitable for this preparation in terms of handling and dispersion performance, but powders, powder granules, tablets, etc. can be used as long as they are water-floating. This preparation can be sprayed as it is with a hand sprayer or a spraying machine, or can be sprayed as a whole in a water-soluble bag or the like for efficient spraying. It is also possible to lightly solidify a fixed amount of the formulation and use it as a tablet.

The pesticide active ingredient used in the preparation of the present invention is not particularly limited, but the following compounds can be exemplified. (1) 2-Benzothiazol-2-yloxy-N-methylacetanilide (2) Methyl α = (4,6-dimethoxypyrimidine-
2-ylcarbamoylsulfamoyl) -O-toluate (3) 1- (α, α-dimethylbenzyl) -3- (paratolyl) urea (4) ethyl 5 = (4,6-dimethoxypyrimidine-
2-ylcarbamoylsulfamoyl) -1-methylpyrazole-4-carboxylate (5) 2-isopropoxyphenyl-N-methylcarbamate (6) 1- (6-chloro-3-pyridylmethyl) -N-
Nitroimidazolidin-2-ylideneamine (7) O, O-dimethyl-O- [3-methyl-4- (methylthio) phenyl] thiophosphate (8) 1- (4-chlorophenoxy) -3,3-dimethyl-1- (1,2,4-triazol-1-yl) -2
-Butanone (9) all-rac-1- (biphenyl-4-yloxy) -3,3-dimethyl-1- (1H-1,2,4-
Triazol-1-yl) butan-2-ol (10) Zinc propylenebisdithiocarbamate These pesticidal active ingredients may be used alone or in admixture of two or more if necessary.

Examples of carriers which can be used in the present invention and which serve as grain nuclei having an apparent specific gravity of less than 1, include pumice, calcined perlite, calcined obsidian, calcined pumice, vermiculite, plastic, wax, wood chips, and rubber. However, the present invention is not limited to this. Examples of the substance that changes the interfacial tension used in the present invention include:
Alkyl benzene sulfonate, alkyl naphthalene sulfonate, alkyl phosphate ester, polyoxyethylene alkyl ether, glycerin fatty acid ester, sorbitan fatty acid ester, alkyl sulfosuccinate salt, lignin sulfonate, naphthalene sulfonate formalin condensate, alkyl Examples thereof include ammonium salts, alkylamine salts, alkylglycine salts, alanine salts, silicone polyether-based activators, alkylallyl sulfonates, camphor, and the like, but are not limited thereto and may be used alone or as necessary. According to the above, two or more kinds may be mixed and used at an arbitrary ratio.

The amount of the substance that changes the interfacial tension used in the present invention is 0.1 to 50% by weight, preferably 1 to 20% by weight, based on the whole. In the formulation of the present invention,
Examples of the oily substance used for coating the pesticide active ingredient and the substance that changes the interfacial tension on the particle nucleus include paraffin, glycerin ester, polyethylene glycol, polyvinyl alcohol, acrylic emulsion,
Examples thereof include natural / synthetic rubber, natural gum, animal / vegetable oil / dextrin, butadiene spindle oil, nylon, gelatin, saccharides, and the like, but are not limited to these, and are further limited to only one of these. Not even a thing.

[0008] The formulation of the present invention can be made into a formulation in which the formulation of the present invention is packaged in a water-soluble film in an amount of 10 to 200 g so as to enable spraying efficiency. Examples of the water-soluble film that is a packaging material include water-soluble polyvinyl alcohol, carboxymethyl cellulose, dextrin, starch, hydroxyethyl cellulose and the like. Further, the formulation of the present invention is 10 to 200
In a unit of g, it can be put into a fixed mold and heated or / and compressed to give a large molded preparation. The shape can be spherical, disk-shaped, columnar, rectangular parallelepiped, cubic, etc.,
It is not limited to these. In molding, the following binders can be exemplified, but the binders are not limited to these. Polyethylene glycol, sugar, natural gum, polyvinyl alcohol, natural / synthetic rubber, etc.

[0009]

EXAMPLES Examples related to the present invention will be described below, but the present invention is not limited to these examples. Formulation Example 1 Agrochemical active ingredient (1) 10.0% by weight Sodium alkylbenzene sulfonate 2.0% by weight Liquid paraffin 8.0% by weight Pumice 80.0% by weight Pumice is impregnated with liquid paraffin in a pan coater,
A pesticide active ingredient (1) and sodium alkylbenzene sulfonate powder were coated and prepared. Formulation Example 2 Agrochemical active ingredient (1) 10.0% by weight Lauryl sulfate sodium salt 2.0% by weight Spindle oil 2.0% by weight Calcined perlite 86.0% by weight ────────────── ───────────────── Water-soluble PVA film (packaging material) Burned perlite is impregnated with spindle oil in a pan coater, and pesticide active ingredient (1), lauryl sulfate sodium salt powder is added. Prepared by coating. A considerable amount of the finished formulation was packaged in a water-soluble PVA film. Formulation Example 3 Agrochemical active ingredient (1) 10.0 wt% Sorbitan fatty acid ester 2.0 wt% Soybean oil 2.0 wt% Water-soluble PVA 2.0 wt% Vermiculite 84.0 wt% In a pan coater Prepared by soaking soybean oil in vermiculite and coating the pesticide active ingredient (1), sorbitan fatty acid ester powder, and water-soluble PVA. Put a considerable amount of the finished preparation in a mold and heat to about 80 ° C to about 5 Kgf /
It was molded by applying a pressure of cm ² .

Comparative Example 1 Pesticide active ingredient (1) 10.0 wt% Spindle oil 2.0 wt% Burned perlite 88.0 wt% Spindle oil is impregnated in the burned perlite in a pan coater, and pesticide active ingredient (1) Prepared by coating. A considerable amount of the finished formulation was packaged in a water-soluble PVA film. Comparative Example 2 Pesticide active ingredient (1) 10.0 wt% Alkylbenzenesulfonic acid sodium salt 0.5 wt% Bentonite powder 30.0 wt% Clay powder 59.5 wt% Pesticide active ingredient (1) and other components are mixed. After doing
Add water and knead. The mixture was extruded using an extruder, dried, and then dried in a fluidized dryer to be sized. Note: The agricultural chemical active ingredient (1) is the following compound. 2-benzothiazol-2-yloxy-N-methylacetanilide

Next, a test example will be shown. Test Example 1 (Dispersibility Test) As shown in FIG. 1, a concrete pool having a vertical length of 4.1 m and a width of 2.6 m has a diameter of about 7.5 cm as an obstacle.
Place 7 bottles of 500, and set the water depth to about 5 cm.
I added a liter of water. Next, after dropping 6.0 g of the formulation prepared and packaged according to Formulation Example 2 and Comparative Example 1, a certain amount of water was collected over time from the point shown in FIG. 1 to measure the concentration of the pesticide active ingredient, The distribution situation was investigated. The results are shown in Table 1. Numerical values in the table are ppm.

[0012]

[Table 1]

Test Example 2 (Dispersibility Test) A test similar to Test Example 1 was performed using Comparative Example 2. The results are shown in Table 2. Numerical values in the table are ppm.

[0014]

[Table 2]

From each table, it was recognized that the preparation of the present invention was extremely rapidly and uniformly dispersed in the paddy field, and similar results were obtained in other preparation examples. Further, it is expected that no chemical damage will occur and the effect will be sufficient. As described above, since the spreadability of this preparation in the paddy water is very good, it is not always necessary to drop it in the center of the paddy field, and it is possible to control the entire paddy field by applying it near the ridge.

[Brief description of drawings]

FIG. 1 is a pool used in Test Examples 1 and 2, where P is a formulation dropping point and (1) to (6) are water sampling points.

Claims (3)

[Claims] 1. A pesticide formulation characterized in that it spreads by traveling on the water surface, in which a grain nucleus having an apparent specific gravity of less than 1 is coated with an oily substance as a pesticide active ingredient and a substance that changes the air / water interfacial tension. .. 2. A pesticide formulation prepared by packaging the pesticide formulation according to claim 1 in a water-soluble film in an amount of 10 to 200 g. 3. An agrochemical formulation which is obtained by molding the agrochemical formulation according to claim 1 into a spherical, disk-shaped, columnar, rectangular parallelepiped or cube shape of 10 to 200 g.