JP3772994B2 - Pesticide granule for paddy field - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to a pesticide granule for paddy fields. Specifically, the present invention relates to an agrochemical granule for paddy fields that has been improved so as to increase the amount of the slightly water-soluble agrochemical active ingredient to be eluted in water and to fully exert its effect.
[0002]
[Background Art and Problems to be Solved by the Invention]
So far, granules, powders, wettable powders, wettable powders, aqueous solvents, liquids, emulsions, etc. have been known as dosage forms for spraying agricultural chemicals. Recently, tablets (jumbo) Packing agents have also been developed.
Granules are widely used for reasons such as little scattering during spraying and easy application of an appropriate amount. Also, in recent years, development has been made in line with the trend of labor saving and pesticide reduction, such as the development of a small amount of granule application (from 3 kg / 10a to 1 kg / 10a).
However, when a poorly water-soluble pesticide active ingredient is processed into granules and sprayed onto paddy fields, the pesticide active ingredient is not eluted in the water, or the eluted pesticide active ingredient is adsorbed to the soil, In some cases, the concentration of the active ingredient is not sufficiently increased and the original effect of the active ingredient cannot be exhibited.
In Japanese Patent Publication Nos. 47-24731, 48-1182 and 3-76281, patents in which emulsions are impregnated into granules to improve the dissolution rate in water are published.
However, even if these methods are used, the concentration of the agricultural chemical active ingredient in the surface water may not be sufficiently increased, and the original effect of the agricultural chemical may not be exhibited.
[0003]
[Means for Solving the Problems]
In view of such circumstances, the present inventors have conducted research, and as a result, when a granule having the following composition (prescription) is applied to a paddy field, the formulation quickly dissolves the agrochemical active ingredient into the surface water. The inventors have found that the effect is sufficiently exhibited, and have completed the present invention.
That is, the present invention provides a paddy pesticide comprising a carrier having a solution having a specific gravity at 20 ° C. of 0.90 or more and less than 1.00 obtained by dissolving a poorly water-soluble pesticide active substance in a water-insoluble organic solvent. It relates to granules.
The paddy field pesticide granule of the present invention can be quickly released to the surface water after being sprayed onto the paddy field, and can be kept at an effective concentration.
Hereinafter, the agrochemical granule for paddy fields of the present invention will be described in detail.
[0004]
The poorly water-soluble agrochemical active substance used in the present invention refers to an agrochemical active substance that has low water solubility and does not exhibit its effect when applied to the water surface, and requires the addition of an auxiliary agent such as a surfactant. For example, a pesticidal active ingredient having a solubility in water at 20 ° C. of 10 ppm or less can be mentioned.
2-benzothiazol-2-yloxy-N-methylacetanilide,
1- (3-chloro-4-trifluoromethylphenyl) -4- (N, N-dimethylcarbamoyl) -5 (4H) -tetrazolinone,
1- (3-chloro-4-trifluoromethoxyphenyl) -4- (N, N-dipropylcarbamoyl) -5 (4H) -tetrazolinone,
1-phenyl-4- (N-ethyl-N-cycloheptylcarbamoyl) -5 (4H) -tetrazolinone,
1- (3-chloro-4-isopropylphenyl) -4- (N, N-dipropylcarbamoyl) -5 (4H) -tetrazolinone,
1- (2-chlorophenyl) -4- (N, N-dipropylcarbamoyl) -5 (4H) -tetrazolinone,
1- (2-chlorocyclohexen-1-yl) -4- (N-ethyl-N-cyclohexylcarbamoyl) -5 (4H) -tetrazolinone,
1- (2-chloro-6-methylphenyl) -4- (N, N-diethylcarbamoyl) -5 (4H) -tetrazolinone,
1- (2-chloro-6-methylphenyl) -4- (N, N-dipropylcarbamoyl) -5 (4H) -tetrazolinone,
1- (2-chlorophenyl) -4- (N-cyclopentyl-N-ethylcarbamoyl) -5 (4H) -tetrazolinone,
1- (2-chlorophenyl) -4- (N-cyclopentyl-N-propylcarbamoyl) -5 (4H) -tetrazolinone,
1- (2-chlorophenyl) -4- (N-cyclohexyl-N-ethylcarbamoyl) -5 (4H) -tetrazolinone,
1- (2-chloro-6-methylphenyl) -4- (N-cyclopentyl-N-propylcarbamoyl) -5 (4H) -tetrazolinone,
1- (2-bromophenyl) -4- (N-cyclopentyl-N-ethylcarbamoyl) -5 (4H) -tetrazolinone,
Examples include 1- (2-chloro-6-methylphenyl) -4- (N-propyl-N-sec-butylcarbamoyl) -5 (4H) -tetrazolinone.
[0005]
Examples of the water-insoluble organic solvent used in the present invention include isoparaffin, high-boiling aromatic hydrocarbon solvents, fatty acid esters, aromatic esters, and mixtures thereof.
The high-boiling aromatic hydrocarbon solvent refers to an aromatic hydrocarbon solvent that is generally sold as a high-boiling solvent. A solvent having a higher boiling point than xylene widely used in agricultural chemical emulsions is referred to as a high-boiling solvent. Often called.
Examples of high-boiling aromatic hydrocarbon solvents include Solvesso 200 (product name: Exxon Chemical Co., Ltd.), Hysol SAS296 (product name: Nippon Petrochemical Co., Ltd.), and Cactus Solvent P-220 (product name: Nikko Petrochemical Co., Ltd.). Can be mentioned.
Examples of the carrier used in the present invention include a porous granular carrier capable of supporting the prepared agricultural chemical solution or a granular carrier kneaded and granulated.
Granular carriers made by the kneading granulation method are widely used in the production of agricultural chemical granules. For example, bentonite, lignin sulfonic acid, and carrier (talc, calcium carbonate, clay, etc.) are pulverized and mixed uniformly as necessary. Next, water is added and kneaded. The kneaded product is extruded through a screen, pulverized to an appropriate length, and then dried in a dryer. Then, the granular carrier having an appropriate particle size can be obtained by sieving the granular carrier.
Examples of porous granular carriers include pumice crushed grains, bentonite crushed grains, and various fired grains.
Further, other agrochemical active substances may be added during kneading granulation. In this case, the agrochemical granule for paddy fields of the present invention containing two or more kinds of agrochemical active ingredients can be produced.
[0006]
The pesticide granule for paddy of the present invention has a water-insoluble pesticide active ingredient in an amount of about 0.1 to about 30 parts by weight, preferably about 1 to about 20 parts by weight per 100 parts by weight of the granules. About 1 part by weight to about 30 parts by weight of a water-insoluble organic solvent, preferably about 5 parts by weight to about 20 parts by weight, and about 40 parts by weight to about 95 parts by weight of an agrochemical granular carrier, preferably about 70 parts by weight. Up to about 90 parts by weight.
The agrochemical granule for paddy field of the present invention is prepared, for example, by dissolving an agrochemical active ingredient in a water-insoluble organic solvent so that the specific gravity at 20 ° C. is 0.90 or more and less than 1.00. Next, the granular carrier is put into a mixer, and the agrochemical solvent prepared while mixing is dropped or sprayed. The target agrochemical granule for paddy fields can be produced by completely impregnating and supporting the particulate carrier and continuing the operation of the mixer until it is uniform.
[0007]
【Example】
Next, although the compound of the present invention will be described more specifically with reference to examples, the present invention is not limited to these examples.
[0008]
Test compound Compound 1 1- (2-Chlorophenyl) -4- (N-cyclohexyl-N-ethylcarbamoyl) -5 (4H) -tetrazolinone,
Compound 2 1-phenyl-4- (N-cycloheptyl-N-ethylcarbamoyl) -5 (4H) -tetrazolinone,
Compound 3 1- (2-chloro-6-methylphenyl) -4- (N-propyl-N-sec-butylcarbamoyl) -5 (4H) -tetrazolinone,
Compound 4 1- (2-chlorocyclohexen-1-yl) -4- (N-cyclohexyl-N-ethylcarbamoyl) -5 (4H) -tetrazolinone,
Compound 5 1- (2-chlorophenyl) -4- (N-cyclopentyl-N-propylcarbamoyl) -5 (4H) -tetrazolinone,
Compound 6 1- (2-chloro-6-methylphenyl) -4- (N-cyclopentyl-N-propylcarbamoyl) -5 (4H) -tetrazolinone,
Compound 7 Methyl 2-{([({{[4,6-dimethoxy-2-pyrimidyl] amino} carbonyl) amino] sulfonyl) methyl} benzoate,
Compound 8 N- (4-methylphenyl) -N ′-(1-methyl-1-phenylethyl) urea,
Compound 9 1- (2-Chloroimidazo [1,2-a] pyridin-3-ylsulfonyl) -3- (4,6-dimethoxypyrimidin-2-yl) urea.
[0009]
Formulation Example 1
Formulated compound 1 3.00%
Isoparaffin 3.60%
Solvesso 200 11.00%
Granular carrier (by kneading granulation method) 82.40%
Production compound 1 was dissolved in a mixed solvent of isoparaffin and Solvesso 200 (product name: Exxon Chemical Co., Ltd.). The specific gravity of this solution was 0.98 g / ml (20 ° C.).
A predetermined amount of the granular carrier was charged into the mixer. While operating the mixer, the compound 1 solution prepared above was added dropwise. After completion of the dropping, the operation was continued until the solution was completely infiltrated to obtain an agrochemical granule.
[0010]
Formulation Example 2
In the formulation of Formulation Example 1, Compound 1 was changed to Compound 2, and in the same manner as Formulation Example 1, an agrochemical granule was obtained.
Formulation Example 3
In the formulation of Formulation Example 1, Compound 1 was replaced with Compound 3, and in the same manner as Formulation Example 1, agrochemical granules were obtained.
Formulation Example 4
In the formulation of Formulation Example 1, Compound 1 was replaced with Compound 4, and agrochemical granules were obtained in the same manner as Formulation Example 1.
Formulation Example 5
In the formulation of Formulation Example 1, Compound 1 was changed to Compound 5, and agrochemical granules were obtained in the same manner as Formulation Example 1.
Formulation Example 6
In the formulation of Formulation Example 1, Compound 1 was changed to Compound 6, and in the same manner as Formulation Example 1, an agrochemical granule was obtained.
[0011]
Formulation Example 7
Formulated compound 1 3.00%
Compound 7 0.75%
Isoparaffin 3.60%
Solvesso 200 11.00%
Sodium lignin sulfonate 0.50%
Bentonite powder 30.00%
Talc powder 51.15%
Production compound 7, sodium lignin sulfonate, bentonite powder and talc powder were mixed with a kneader KDAJ-60 (manufactured by Fuji Powder Co., Ltd.), and water was added and kneaded. The kneaded product was transferred to an extrusion granulator and extruded using a 0.8 mm screen. A granular carrier containing an agrochemical active substance (Compound 7) was obtained by drying in a fluid bed dryer.
Compound 1 was dissolved in a mixed solvent of isoparaffin and Solvesso 200. The specific gravity of this solution was 0.98 g / ml (20 ° C.).
The granular carrier was put into a mixer. While operating the mixer, the prepared Compound 1 solution was added dropwise. After completion of the dropping, the operation was continued until the solution was completely impregnated to obtain an agrochemical granule.
[0012]
Formulation Example 8
Formulated compound 1 3.00%
Compound 8 15.00%
Compound 9 0.75%
Isoparaffin 3.60%
Solvesso 200 11.00%
Sodium lignin sulfonate 0.50%
Bentonite powder 30.00%
Talc powder 36.15%
Production compound 8, compound 9, sodium lignin sulfonate, bentonite powder and talc powder were mixed with a kneader KDAJ-60, and water was added and kneaded. The kneaded product was transferred to an extrusion granulator and extruded using a 0.8 mm screen. It dried with the fluid bed dryer and the granular support | carrier containing an agrochemical active substance (Compound 8, Compound 9) was obtained.
Compound 1 was dissolved in a mixed solvent of isoparaffin and Solvesso 200. The specific gravity of this solution was 0.98 g / ml (20 ° C.).
The granular carrier was charged into a mixer, and the compound 1 solution was added dropwise while the mixer was operating. After completion of dropping, the operation was continued until the solution was completely soaked to obtain an agrochemical granule.
[0013]
Comparative Example 1
Formulated compound 1 3.00%
Sodium lignin sulfonate 0.50%
Bentonite powder 30.00%
Kneaded granule carrier 66.50%
All manufactured components were put into a kneader KDAJ-60, mixed and then kneaded with water. The kneaded product was transferred to an extrusion granulator and extruded using a 0.8 mm screen. It dried with the fluid bed dryer and obtained the agrochemical granule.
[0014]
Comparative Example 2
Formulated compound 1 3.00%
Compound 7 0.75%
Solvesso 200 15.00%
Sodium lignin sulfonate 0.50%
Bentonite powder 30.00%
Talc powder 51.15%
Production compound 7, sodium lignin sulfonate, bentonite powder, and talc powder were mixed with a kneader KDAJ-60, and water was added and kneaded. The kneaded product was transferred to an extrusion granulator and granulated using a 0.8 mm screen. It dried with the fluid bed dryer and obtained the granular support | carrier containing the agrochemical raw material.
Compound 1 was dissolved in Solvesso 200. The specific gravity of this solution was 1.03 g / ml (20 ° C.).
While the granular carrier was charged into the mixer and operated, the Compound 1 solution was added dropwise. After completion of dropping, the operation was continued until the solution was completely soaked to obtain an agrochemical granule.
[0015]
Comparative Example 3
Formulated compound 1 3.00%
Compound 8 15.00%
Compound 9 0.90%
N-dodecylpyrrolidone 20.00%
Mixture of polyoxyethylene styryl phenyl ether and calcium dodecylbenzenesulfonate 1.00%
Sodium lignin sulfonate 0.50%
Bentonite powder 30.00%
Talc powder 29.60%
Production compound 8, compound 9, sodium lignin sulfonate, bentonite powder and talc powder were mixed with a kneader KDAJ-60, and water was added and kneaded. The kneaded product was transferred to an extrusion granulator and granulated using a 0.8 mm screen. It dried with the fluid bed dryer and obtained the granular support | carrier containing the agrochemical raw material.
Compound 1 was mixed with polyoxyethylene styryl phenyl ether, calcium dodecylbenzenesulfonate and N-dodecylpyrrolidone to make an emulsion of Compound 1. The specific gravity of this emulsion was 0.95 g / ml (20 ° C.).
The granular carrier was put into a mixer. The emulsion was added dropwise while the mixer was running. After completion of dropping, the operation was continued until the emulsion was completely soaked to obtain an agrochemical granule.
[0016]
Test Example 1 (Measurement of concentration of agrochemical active ingredients in water)
Water was added to a plastic (25 cm × 39 cm × 15 cm) pot filled with paddy soil to a thickness of 5 cm to a depth of 4 cm. After allowed to stand in 20 ° C. in a thermostatic bath, Formulation Examples 1 to 8 and were weighed preparation 0.1g of Comparative Examples 1 to 3 were uniformly sprayed.
A part of water was collected from each pot every predetermined time and analyzed by HPLC, and the concentrations of Compound 1 to Compound 6 were measured by the absolute calibration curve method.
Results [0017]
[Table 1]
[0018]
[Table 2]
[0019]
【The invention's effect】
As shown in the test examples, the present invention showed the effect of maintaining the effective concentration in water by quickly releasing the poorly water-soluble agrochemical active substance into the surface water.

Claims (4)

  A carrier having a specific gravity at 0.90 to less than 1.00 obtained by dissolving a poorly water-soluble pesticide active substance in a mixture of a high-boiling aromatic hydrocarbon solvent and isoparaffin is supported on a carrier. A characteristic pesticide granule for paddy fields.   The agrochemical granule for paddy fields according to claim 1, wherein the poorly water-soluble pesticide active substance is 1- (2-chlorophenyl) -4- (N-cyclohexyl-N-ethylcarbamoyl) -5 (4H) -tetrazolinone.   The agrochemical granule for paddy fields according to claim 1, wherein the carrier is a porous granular carrier or a granular carrier produced by a kneading granulation method.   The pesticide granule for paddy fields according to claim 1, wherein the carrier is a granular carrier containing another agrochemical active substance produced by a kneading granulation method.