JP7388125B2 - Pesticide granules - Google Patents

Description

The present invention relates to pesticide granules.

In the cultivation of paddy rice, a pesticide formulation is applied to a seedling nursery box, and when the seedlings grown in the nursery box are transplanted to a paddy field, the pesticide active compound contained in the pesticide formulation is also applied to the rice field, and the pesticide active compound is applied to the rice field. As long as the efficacy of the compound lasts, no new application of the pesticide active compound to the rice fields is required. Therefore, many agrochemical formulations suitable for such application forms have been developed (see, for example, Patent Document 1).

On the other hand, oxazosulfur is known as an insecticidal compound (see, for example, Patent Document 2 and Patent Document 3).

Japanese Patent Application Publication No. 2016-166149 JP2017-131236A International Publication No. 2017/104592

An object of the present invention is to provide oxazosulfur-containing agricultural chemical granules in which elution of the contained oxazosulfyl is controlled and changes in physicochemical properties over time are suppressed.

As a result of studies to find such agricultural chemical granules, the present inventors have developed agricultural chemical granules containing specific amounts of oxazosulfyl, alpha starch, nonionic surfactant, calcium carbonate, and clay. It has been found that the elution of oxazosulfur contained in the granules is controlled, and changes over time in the physicochemical properties of the granules are suppressed.
That is, the present invention is as follows [1] to [5].
[1] Oxazosulfil 0.5 to 5% by weight,
Alpha starch 4-7% by weight,
Nonionic surfactant 0.1 to 5% by weight,
Calcium carbonate 3-10% by weight, and clay 50-92% by weight
Pesticide granules containing.
[2] The agrochemical granule according to [1], wherein the nonionic surfactant is at least one nonionic surfactant selected from the group consisting of polyoxyethylene alkyl ether and polyoxyethylene alkylaryl ether.
[3] The agricultural chemical granule according to [1], wherein the nonionic surfactant is polyoxyethylene tristyrylphenyl ether.
[4] The agricultural chemical granule according to any one of [1] to [3], wherein the clay is waxite.
[5] The pesticide granule according to any one of [1] to [4], which has a pH of 9.4 or more at 20° C. when 10 g of the pesticide granule and 90 g of ion-exchanged water are mixed.

The pesticide granules of the present invention can suppress the elution of the contained oxazosulfyl by using specific amounts of oxazosulfyl, alpha starch, nonionic surfactant, calcium carbonate, and clay, respectively, Moreover, it is possible to suppress changes in physicochemical properties over time, particularly a decrease in hardness over time.

The agricultural chemical granule of the present invention (hereinafter referred to as the present granule) contains oxazosulfyl. In addition, oxazosulfur is represented by the following formula (1)
This is a compound represented by The content of oxazosulfur in the present granules is usually in the range of 0.5 to 5% by weight, preferably 1 to 3% by weight.

This granule contains alpha starch. The content of alpha starch in this granule is in the range of 4 to 7% by weight.

This granule contains a nonionic surfactant. Examples of such nonionic surfactants include polyoxyethylene alkyl ether, polyoxyethylene alkylaryl ether, polyoxyethylene lanolin alcohol, polyoxyethylene alkylphenol formalin condensate, polyoxyethylene sorbitan fatty acid ester, and polyoxyethylene glyceryl monofatty acid ester. , polyoxypropylene glycol monofatty acid ester, polyoxyethylene sorbitol fatty acid ester, polyoxyethylene castor oil derivative, polyoxyethylene fatty acid ester, higher fatty acid glycerin ester, sorbitan fatty acid ester, sucrose fatty acid ester, polyoxyethylene polyoxypropylene block Examples include polymers, polyoxyethylene fatty acid amides, alkylolamides, polyoxyethylene alkyl amines, and at least one nonionic surfactant selected from the group consisting of polyoxyethylene alkyl ethers and polyoxyethylene alkylaryl ethers. Preferably, polyoxyethylene tristyrylphenyl ether is more preferable.
The content of nonionic surfactant in the present granules is usually in the range of 0.1 to 5% by weight, preferably 0.5 to 2% by weight.

This granule contains calcium carbonate. The content of calcium carbonate in this granule ranges from 3 to 10% by weight.

This granule contains clay. As used herein, clay refers to a substance whose main component is silicate minerals, and is a natural product generally referred to as clay, whose pulverized product is used as an extender when preparing pesticide granules. There is. Such clays include smectite minerals such as saponite, hectorite, sauconite, stevensite, nontronite, montmorillonite, and beidellite, kaolinite minerals such as kaolinite, dickanite, nacrite, and hallosite, chrysotile, lizardite, anticolite, and americanite. Examples include serpentine such as pyrophyllite, talc, waxite, muscovite, phengite, sericite, mica such as illite, hydrous magnesium silicate such as attapulgite and sepiolite, zeolite, vermiculite, etc. preferable.
The content of clay in the present granules is usually in the range of 50 to 92% by weight, preferably 70 to 90% by weight.

In addition to oxazosulfur, the present granules may contain other agriculturally active compounds. Examples of such other pesticide active compounds include insecticidal active compounds, fungicidal active compounds, insect growth regulating active compounds, herbicidal active compounds, and plant growth regulating active compounds. In the present invention, it is preferable to use a disease resistance-inducing compound that is an active ingredient of a disease resistance-inducing agent. Disease resistance inducers are drugs that control diseases by making plants develop disease resistance rather than acting directly on pathogens, and are mainly used to control rice blast. In the present invention, at least one compound selected from the group consisting of tiadinil, isotianil, probenazole, and acibenzolar-S-methyl is used as the disease resistance-inducing active compound. Compounds that are active in inducing disease resistance are preferred, and among these, isotianil is preferred.
When the present granules contain other agriculturally active compounds, the content is usually in the range of 0.1 to 50% by weight, preferably 0.5 to 10% by weight.

The granules may also contain formulation auxiliaries. Examples of such formulation auxiliaries include penetrants, wetting agents, binders, preservatives, antioxidants, fixing agents, antifoaming agents, rust preventives, and dyes/pigments.

This granule has a pH of 9.4 or higher at 20°C (hereinafter referred to as the pH of the granule) when 10 g of the pesticide granule and 90 g of ion-exchanged water are mixed, or 9.4 to 10.4. It is preferable that it is in the range of . To determine the pH value of the granules, grind 10 g of the pesticide granules using a grinder, place the resulting pulverized product in a 100 mL container such as a screw tube, and add 90 g of ion-exchanged water whose temperature has been adjusted to 20°C. After mixing for 1 minute, the glass electrode of a glass electrode pH meter is immersed in the mixed solution and left to stand, and the value is measured 5 minutes later. Pesticide granules can be pulverized for about 1 minute using a pulverizer such as a coffee mill (Mini Blender MB-2, manufactured by Melita). If the pH of the granules is lower than 9.4, the content of calcium carbonate should be adjusted within the above range so that the pH of the granules is 9.4 or higher, or in the range of 9.4 to 10.4. The pH of the granules may be increased, alkaline clay may be added, or an appropriate amount of additives (such as a pH adjuster) for making the pH of the granules alkaline may be added.

The granules are prepared by adding water to a mixture containing oxazosulfur, alpha starch, nonionic surfactant, calcium carbonate and clay, and, if necessary, formulation auxiliaries and/or other agrochemically active compounds. The product can be produced by granulating the kneaded product obtained by kneading, then drying the obtained granulated product, and subjecting it to crushing, sieving, sizing, etc., if necessary. The amount of water added during kneading is usually 3 to 50 parts by weight per 100 parts by weight of the mixture. Examples of the kneader used during kneading include a kneader, a Nauta mixer, a Loedige mixer, and a vertical granulator.

When the kneaded product is extruded and granulated, it is usually extruded and granulated using a screen with a diameter of 0.5 to 2.0 mm, preferably 0.7 to 1.5 mm. The granulated product obtained by extrusion granulation is usually dried at 30 to 90°C, preferably 30 to 80°C. After drying, the particle length of the final product obtained by crushing, sieving, sizing, etc. as required is usually 0.5 to 6.0 mm, preferably 0.7 to 4 mm. .0mm. In this specification, grain length means the maximum length that grains can have. Extrusion granulators include screw type extrusion granulator, roll type extrusion granulator, disc pelleter type extrusion granulator, pellet mill type extrusion granulator, basket type extrusion granulator, and blade type extrusion granulator. Examples include a machine, an oscillating type extrusion granulator, a gear type extrusion granulator, a ring die type extrusion granulator, and the like.

This granule is suitable for treating paddy rice seedling boxes. A paddy rice seedling box has a size of 30 cm x 60 cm (inner diameter: 28 cm x 58 cm), and is a seedling box in which rice seedlings are raised until they are planted (generally for 20 to 40 days). Paddy rice seedling box treatment is a simple control method in which granules are sprayed on rice seedling boxes to control pests and diseases that occur in rice fields after rice planting.

Next, the present invention will be explained in more detail using production examples, test examples, etc., but the present invention is not limited to these examples.

Reference Production Example 1 Preparation of Powdered Pesticide Composition 1 70.0 parts by weight of oxazosulfur and 30.0 parts by weight of waxite (Katsukoyama Clay S, manufactured by Katsukoyama Mining Co., Ltd.) were mixed uniformly and centrifuged. A powdered agricultural chemical composition (hereinafter referred to as powdered agricultural chemical composition 1) containing oxazosulfur having a volume median diameter of 5.9 μm (measured by MASTERSIZER 2000 manufactured by MALVERN) was obtained by pulverizing the entire amount with a pulverizer. Obtained.

Reference Production Example 2 Preparation of Powdered Pesticide Composition 2 70.0 parts by weight of isotianil and 30.0 parts by weight of waxite (Katsukoyama Clay S, manufactured by Katsukoyama Mining Co., Ltd.) were mixed uniformly, and the mixture was placed in a centrifugal pulverizer. The entire amount was pulverized to obtain a powdery agrochemical composition containing isotianil (hereinafter referred to as powdery agrochemical composition 2) having a volume median diameter of 6.0 μm (measured using MASTERSIZER 2000 manufactured by MALVERN).

Production Example 1 Preparation of Present Granule 1 2.9 parts by weight of powdered agricultural chemical composition 1, 5.0 parts by weight of alpha starch (Mold No. 1A, manufactured by Nippon Corn Starch), calcium carbonate (SS#80, Nitto Funka Kogyo Co., Ltd.) A mixture of 5.0 parts by weight of waxite (Katsukoyama Clay S, manufactured by Katsukoyama Mining Co., Ltd.) and 86.1 parts by weight of waxite (Katsukoyama Clay S, manufactured by Katsukoyama Mining Co., Ltd.) was added with a nonionic surfactant (polyoxyethylene tristyrylphenyl ether, Sorpol T-20, About 20 parts by weight of water containing 1.0 parts by weight (manufactured by Toho Chemical Industries, Ltd.) was added and kneaded. Approximately 1.0 kg of the obtained kneaded material was put into a basket type extrusion granulator with a 1.2 mm diameter screen (HU-G type field type granulator, manufactured by Hata Iron Works Co., Ltd.), and the granulator was heated for 10 seconds. The granulator was operated. After removing the granules obtained in 10 seconds, the operation of the granulator was restarted, and the granules obtained in 30 seconds were dried at 70 ° C. for 30 minutes to obtain the present granule 1. .

Production Example 2 Preparation of Present Granule 2 2.9 parts by weight of powdered agricultural chemical composition 2 was added, and 86.1 parts by weight of waxite (Katsukoyama Clay S, manufactured by Katsumitsuyama Mining Co., Ltd.) was adjusted to 83.2 parts by weight. Except for this, the same operation as in Production Example 1 was performed to obtain the present granule 2.

Comparative Production Example 1 Preparation of Comparative Pesticide Granules 1 Powdered Pesticide Composition 1 2.9 parts by weight, synthetic hydrated silicon oxide fine powder (Tokusil GU-N, manufactured by Tokuyama) 1.0 parts by weight, lignin sulfonate (Polyfon) H, manufactured by Ingevity) 2.0 parts by weight, bentonite (bentonite Hotaka, manufactured by Hojun) 20.0 parts by weight, and kaolin clay (Caolin B-10, manufactured by INDUSTRIAS FINOR, S.L.) 74.1 parts by weight. About 27 parts by weight of water was added to the mixture and kneaded. Approximately 1.0 kg of the obtained kneaded material was put into a basket type extrusion granulator with a 1.2 mm diameter screen (HU-G type field type granulator, manufactured by Hata Iron Works Co., Ltd.), and the granulator was heated for 10 seconds. The granulator was operated. After removing the granules obtained in 10 seconds, the operation of the granulator was restarted, and the granules obtained in 30 seconds were dried at 70 ° C. for 30 minutes to obtain Comparative Pesticide Granules 1. Ta.

Comparative Production Example 2 Preparation of Comparative Pesticide Granules 2 2.9 parts by weight of powdered pesticide composition 2 was added, and 74.1 parts by weight of kaolin clay (Caolin B-10, manufactured by INDUSTRIAS FINOR, S.L.) was added to 71 parts by weight. Comparative Pesticide Granules 2 was obtained by carrying out the same operation as in Comparative Production Example 1 except that the amount was changed to .2 parts by weight.

Test example 1
The following operations were performed for each of the present granules 1 and 2 and the comparative pesticide granules 1 and 2. A ceramic cylindrical ball mill pot (diameter 125 mm, height 125 mm) containing 3 ceramic balls (weight 35 ± 3.0 g/piece, diameter 30 ± 2.0 mm) containing 100 g (Ag) of pesticide granules was weighed. The lid was closed, and the ball mill pot was placed on a roller and rotated at a speed of 75 revolutions/minute for 15 minutes. Thereafter, the pesticide granules were taken out from the ball mill pot, sieved through a 500 μm sieve, the weight (Bg) of the pesticide granules remaining on the 500 μm sieve was measured, and the disintegration rate was determined using the following formula.
Disintegration rate [%] = (AB)/A x 100
The results are shown in Table 1. All pesticide granules had a low disintegration rate and good hardness.

Test example 2
The present granules 1 and 2 and the comparative pesticide granules 1 and 2 were placed in aluminum-lined kraft bags and stored at 40°C and 90% relative humidity for 2 weeks. The disintegration rate of the agent was measured. The results are shown in Table 2. The disintegration rates of Present Granules 1 and 2 hardly changed, and the disintegration rates of Comparative Pesticide Granules 1 and 2 increased.

Test example 3
900 mL of 3 degree hard water was placed in a glass container with a lid (φ11 cm x height 15 cm), and the water temperature was adjusted to 25±1.0°C. A predetermined amount of either Present Granule 1 or Comparative Pesticide Granules 1 and 2 was placed in the container, and the container was left to stand while controlling the temperature so that the liquid temperature in the container was 25 ± 1.0°C. . Three days after the pesticide granules were added, about 2 mL of the solution was sampled from the center of the container using a polypoid. Analyze the sampled solution using high performance liquid chromatography under predetermined conditions, quantify the oxazosulfur concentration in the sampled solution, and elute oxazosulfur using the following formula. The rate was calculated.
Elution rate of oxazosulfur (%) = (oxazosulfur concentration in sampled solution [ppm]/maximum elution concentration of pesticide granules tested in water elution test [ppm]) x 100
The results are shown in Table 3. However, the amount of pesticide granules tested was such that the concentration (maximum elution concentration [ppm]) of 0.601 ppm when all of the oxazosulfur contained in the pesticide granules was dissolved in water. did.

Claims (4)

Oxazosulfur 0.5-5% by weight,
Alpha starch 4-7% by weight,
Nonionic surfactant 0.1 to 5% by weight,
Calcium carbonate 3-10% by weight, and clay 50-92% by weight
An agricultural chemical granule containing the following, which has a pH of 9.4 or more at 20° C. when 10 g of the agricultural chemical granule and 90 g of ion-exchanged water are mixed. The agricultural chemical granule according to claim 1, wherein the nonionic surfactant is at least one nonionic surfactant selected from the group consisting of polyoxyethylene alkyl ether and polyoxyethylene alkylaryl ether. The agricultural chemical granule according to claim 1, wherein the nonionic surfactant is polyoxyethylene tristyrylphenyl ether. The agricultural chemical granule according to any one of claims 1 to 3, wherein the clay is waxite.