JPH09136802A - Underwater spreading pesticide and underwater spreading agent - Google Patents

Abstract

(57) [Abstract] [PROBLEMS] To create a pesticide granule in which a pesticide active ingredient diffuses rapidly and uniformly in paddy water. SOLUTION: An underwater spreadable pesticide comprising an agrochemical active ingredient, an isopropylnaphthalene solvent represented by the following formula, and a solid carrier. Embedded image (In the formula, m represents an integer of 0 to 2 and n represents an integer of 1 to 2, and the position of these substituents does not matter.)

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a granular pesticide having improved spreadability in water. More specifically, the present invention relates to a granular pesticide that has a uniform concentration in water in a short time when the pesticide active ingredient is rapidly released from the granules and diffused in the paddy water when the particles are dispersed in a paddy field under flooded water.

[0002]

2. Description of the Related Art Conventionally, much research has been conducted on how to release active ingredients from granules in order to bring out the control effect of the active ingredients of agricultural chemicals. The following are examples.

Utilizing the swelling power of a bulking agent such as bentonite, a method of disintegrating and spreading granules quickly and widely to diffuse an agrochemical active ingredient in water, or a surfactant,
There is a method in which an oily substance or other auxiliary agent is used and the effect is elicited by spreading it more widely and uniformly.

In particular, recently, formulation studies using an oily substance have been actively conducted. The following are examples.

1 part by weight of the foliage-absorptive herbicidally active compound for paddy fields has a specific gravity of 0.8-1 and a viscosity of 300 cps or less, a water-insoluble ester oily liquid of 1-50 parts by weight and a specific gravity of 1 or more, a water-insoluble. The present invention relates to a granule composition for weed control in a paddy field, which comprises 1 to 18 parts by weight of a fine solid carrier and exerts an excellent herbicidal effect in a submerged treatment of a paddy field after planting (Japanese Patent Laid-Open No. 5-65201).

A water-floating pesticide granule comprising a pesticidal active ingredient which is sparingly soluble or insoluble in water, an oily alkylbenzene having an alkyl group having 25 or less carbon atoms and a solid carrier (JP-A-3-279302). JP-A-3-
279306).

[0007] By coating an active ingredient of a pesticide and a substance that changes the interfacial tension of air and water with an oily substance on a particle nucleus having an apparent specific gravity of less than 1, the formulation runs on the water surface, and the pesticide spreads evenly over the entire rice field. Those relating to granules (JP-A-5-155703).

A herbicidal active ingredient having a water solubility of 1000 ppm or less is dispersed or dissolved in a high boiling point solvent containing a surfactant to obtain a mixture, and the mixture, the fine mineral powder and the surfactant are extruded. Those relating to herbicidal granules for paddy fields which are excellent in elution and dispersibility in water obtained by granulation (JP-A-5-17304).

However, none of the methods have been sufficiently effective. Furthermore, recently, there is a problem of offensive odor to workers and residents around the chemical treatment area. However, most of the oily liquids used for pesticide formulations have a strong odor, or the flash point of the oily liquids, etc.
There are many problems such as various restrictions in terms of environmental hygiene and danger as a hazardous material, and it is not yet satisfactory.

As a technique using alkylnaphthalene, Japanese Patent Laid-Open No. 7-196402 discloses an oil obtained by dissolving and dispersing insecticides and bactericides composed of organic phosphorus compounds in a solvent containing alkylnaphthalene as a main component. It has been reported that the formulation.

[Problems to be Solved by the Invention] With conventional pesticide granules,
Elution and diffusion of pesticide active ingredients in paddy water is still insufficient. Therefore, it is desired to develop granules that diffuse more rapidly and widely. In addition, the oily liquid used in the formulation is desired to be odorless.

[0011]

Means for Solving the Problems Accordingly, the present inventors have:
As a result of diligent research aimed at improving the good in-water diffusibility of granular pesticides, we found that granular pesticides consisting of pesticide active ingredients, isopropylnaphthalene-based solvents and solid carriers have excellent diffusivity in water, and completed the present invention. Came to do.

The pesticidal active ingredient according to the present invention is not particularly limited as long as it is usually used in paddy fields, and one kind or two or more kinds thereof may be used in combination. Some examples are:

(Examples of insecticides) MPP, MEP, pirimiphos-methyl, diazinon, isoxathion, pyridafenthion, chlorpyrifos-methyl, bamidthione, marathon, PAP, dimethoate, ethylthiomethone, PM
P, monocrotophos, BRP, CVMP, dimethylvinphos, propaphos, DEP, EPN, NAC, MTM
C, MIPC, BPMC, PHC, MPMC, XM
C, bendiocarb, carbosulfan, benflacarb, thiodicarb, cycloprotoline, etofenprox, cartap, thiocyclam, bensultap, buprofezin, etc.

(Examples of bactericide) Basic copper sulfate, basic copper chloride, cupric hydroxide, organic sulfur nickel salt, thiuram, captan, TPN, phthalide, IBP, EDDP, thiophanate methyl, benomyl, iprodione, mepronil, Flutolanil, teclophthalam, penciclone,
Metalaxyl, triflumizole, blasticidin S, kasugamycin, polyoxine, validamycin A, oxytetracycline, hydroxyisoxazole, metasulfocarb, MAF, MAFE, benchazole, phenazine oxide, diclomedine, probenazole, isoprothiolane, tricyclazole, pyroquilon, Oxolinic acid, guazatine, etc.

(Examples of herbicides) 2,4-D, MCP, MC
PB, phenothiol, clomeprop, naproanilide, CNP, clomethoxynil, bifenox, MC
C, Bentocarb, Esprocarb, Molnate, Dimepiperate, DCPA, Butachlor, Pretilachlor, Bromobutide, Mefenacet, Dimuron, Bensulfuron-methyl, Cimetrin, Promethrin, Dimethamethrin, Bentazone, Oxadiazone, Pyrazolate, CN, Piperoxifene, Benzophenap, Trifluralin, Piperoxifene. Such.

(Examples of plant regulators) Inabenfide, oxyethylenedocosanol, nicotinic acid amide, benzylaminopurine, etc.

The amount of these pesticidal active ingredients added to the granules is not particularly limited, but is generally 0.01 to 50% (wt%) of the total amount of the granules. Depending on the kind of the component, it may be added so that the required amount of spray per 10 ares.

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

As the isopropylnaphthalene solvent according to the present invention, those represented by the following general formula can be preferably used.

[0020]

Embedded image (In the formula, m represents an integer of 0 to 2 and n represents an integer of 1 to 2, and the position of these substituents does not matter.)

The preferred specific examples contained therein are monomethylmonoisopropylnaphthalene, diisopropylnaphthalene, dimethylmonoisopropylnaphthalene, dimethyldiisopropylnaphthalene, and the like. And although these may be 1 type, 2 or more types can be used together. The amount of these added to the formulation is preferably in the range of 0.02 to 50 parts by weight, preferably 0.05 to 30 parts by weight with respect to 1 part by weight of the agrochemical active ingredient in the granular pesticide formulation. .

The above-mentioned isopropylnaphthalene-based solvent is prepared by isolating the fractions of petroleum naphtha, kerosene, etc., by distilling methylnaphthalene, dimethylnaphthalene, etc. contained in the catalytically reformed product oil, and isolating them. Is obtained by And, these are usually obtained as a mixture of mono-form and di-form. This may be isolated, but can be used as a mixture as it is.

Although it may be produced by itself by the above-mentioned method, it may be produced by the above chemical name or, for example, "KMC-11".
3 ”(which contains diisopropylnaphthalene and is a trade name manufactured by Kureha Chemical Industry Co., Ltd.) and the like, which are commercially available under various trade names, can be used as they are.

The solid carrier according to the present invention may be an inorganic carrier or an organic carrier, and is not particularly limited as long as it is generally used in agricultural chemical formulations. For example, the following may be mentioned.

(Inorganic carrier) Clay, bentonite, talc, calcium carbonate, sodium carbonate, sikhlite,
Sericite, acid clay, silica stone, diatomaceous earth, pumice, perlite, zeolite, vermiculite, potassium chloride, urea, white carbon, ammonium sulfate, sodium sulfate, magnesium sulfate, etc.

(Organic carrier) glucose, maltose, sucrose, lactose, dextrin, starch,
Cellulose, carboxymethyl cellulose, polyvinyl alcohol, polyethylene oxide, polypropylene oxide, sodium polyacrylate, polyethylene glycol, polypropylene glycol, gum arabic, xanthan gum, etc.

These inorganic carriers or organic carriers may be used either individually or in combination of two or more. In this case, an inorganic carrier and an organic carrier may be used together.

[0028]

BEST MODE FOR CARRYING OUT THE INVENTION The granular pesticide according to the present invention as described above includes, for example, a pesticide active ingredient, an isopropylnaphthalene-based solvent represented by the general formula and a solid carrier, and optionally a surfactant and a binder. And a stabilizer of a pesticide active ingredient, an auxiliary agent such as a physical property improver are mixed and kneaded with water,
After granulation using an extrusion granulator, it may be dried and sized. The particle size is not particularly limited, and is 0.1-10.
It may be appropriately prepared within the range of mm.

Surfactants usable in the present invention include:
It is not particularly limited as long as it is generally used, and examples thereof include conventionally known nonionic surfactants, anionic surfactants, cationic surfactants and amphoteric surfactants.

Of these, nonionic surfactants and anionic surfactants are particularly preferably used.

Examples of the nonionic surfactant include, for example,
Polyoxyethylene alkylaryl ether (eg polyoxyethylene nonylphenyl ether), polyoxyalkylene aryl phenyl ether, polyoxyethylene styryl phenyl ether, polyoxyethylene alkyl ester, polyoxyethylene sorbitan alkylate, polyoxyalkylene glycol, poly Examples thereof include oxyethylene phenyl ether polymer.

Specific examples of the anionic surfactant include lignin sulfonate, alkylaryl sulfonate, dialkyl sulfosuccinate, polyoxyethylene alkylaryl phosphate, polyoxyethylene alkylaryl ether sulfate and alkyl. Examples thereof include naphthalene sulfonate, polyoxyethylene styryl phenyl ether sulfate, and the like.

Specific examples of the cationic surfactants and amphoteric surfactants include alkylamines, quaternary ammonium salts, alkylbetaines, amine oxides and the like.

In the present invention, one kind or a combination of two or more kinds may be used in such an amount that the content of these surfactants in the obtained granular pesticide is 1 to 30% by weight.

The surfactant that can be used in the present invention is not limited to the above examples.

The binder that can be used in the present invention is not particularly limited, but examples thereof include the following.

Starch, dextrin, cellulose, methyl cellulose, ethyl cellulose, carboxymethyl cellulose, hydroxyethyl cellulose, hydroxypropyl cellulose, carboxymethyl starch, pullulan, sodium alginate, ammonium alginate,
Alginic acid propylene glycol ester, guar gum, locust bean gum, gum arabic, xanthan gum, gelatin, casein, vinyl alcohol, polyethylene oxide, polyethylene glycol, ethylene / propylene block polymer, sodium polyacrylate, polyvinylpyrrolidone, etc.

In the present invention, one or two of these substances are used.
More than one species can be used in combination. The amount to be added is not particularly limited, but 0.1-40% in the formulation from the viewpoint of effect and economy.
Parts by weight are desirable.

The auxiliary agents that can be used in the present invention are not limited to the above examples.

[0040]

EXAMPLES Next, the granular pesticide of the present invention will be described more specifically by way of examples, but the present invention is not limited to these examples.

In the following examples and comparative examples, "part" means "part by weight".

Example 1 2 parts of MEP, 3 parts of BPMC and 10 parts of dimethylmonoisopropylnaphthalene were mixed and dissolved, and 15 parts of this mixed solution was pulverized and mixed in advance with a hammer mill (manufactured by Fuji Paudal Co., Ltd.), white carbon. 10 copies,
Sodium dodecylbenzene sulfonate 2 parts, sodium lauryl sulfate 1 part, polyvinyl alcohol 0.
5 parts and 71.5 parts of clay were added to the powder mixture,
Add 10 parts of water, knead and mix with a double-arm kneader (manufactured by Fuji Paudal Co., Ltd.), and then granulate with a basket type extrusion granulator (manufactured by Nippon Pharmaceutical Co., Ltd.) using a screen with a hole diameter of 1.0 mm. Then, it was further dried by a fluidized bed dryer (manufactured by Fuji Paudal Co., Ltd.) to obtain a granular pesticide.

Example 2 4 parts MIPC, dimethyldiisopropylnaphthalene
10 parts of polyoxyethylene styryl phenyl ether and 2 parts of polyoxyethylene styryl phenyl ether were stirred and mixed at 2,000 rpm for 5 minutes with a TK homomixer (manufactured by Tokushu Kika Kogyo Co., Ltd.), and 16 parts of this mixture was crushed and mixed in advance with a hammer mill to obtain white carbon 10 parts, 2 parts of sodium lauryl sulfate, 2 parts of pullulan, and 70 parts of bentonite were added to a powder mixture, 12 parts of water was added, and the mixture was kneaded and mixed with a double-arm kneader, and then a basket using a screen with a hole diameter of 1.0 mm was used. It was granulated by a mold extrusion granulator and further dried by a fluidized bed dryer to obtain a granular pesticide.

Example 3 30 parts of probenazole, 1.5 parts of monomethyl monoisopropyl naphthalene, sodium lauryl sulfate 3
Parts, 5 parts of sodium lignin sulfonate, 5 parts of white carbon and 55.5 parts of clay are crushed and mixed by a hammer mill, 10 parts of water is further added, and the resulting mixture is kneaded and mixed by a double-arm kneader, then a screen having a hole diameter of 1.0 mm. After granulating with a basket type extrusion granulator using, the product was further dried with a fluidized bed dryer to obtain a granular pesticide.

Example 4 1.0 part of phenothiol and 30 parts of diisopropylnaphthalene were mixed and dissolved, and 16 parts of this mixed solution were previously crushed and mixed with a hammer mill to obtain 15 parts of white carbon and sodium dodecylbenzenesulfonate.
2 parts, 3 parts of soluble starch and 64 parts of clay were added to a powder mixture, 12 parts of water was further added, and the mixture was kneaded and mixed in a twin-arm kneader, and then a basket type extrusion granulator using a screen with a hole diameter of 1.0 mm. After granulation in (1), it was further dried in a fluidized bed dryer to obtain a granular pesticide.

Example 5 1.4 parts of phenothiol and 30 parts of dimethylisopropylnaphthalene were mixed and dissolved, and 16 parts of this mixed solution was previously crushed and mixed with a hammer mill to obtain 1.5 parts of cimetrin, 15 parts of white carbon and dodecyl. 2 parts of sodium benzenesulfonate, 5 parts of sodium ligninsulfonate, 3 parts of soluble starch and 57.5 parts of bentonite were added to a powder mixture and 1 part of water was further added.
After adding 0 parts and kneading and mixing with a double-arm kneader, hole diameter 1.0m
After granulating with a basket type extrusion granulator using a screen of m, it was further dried with a fluidized bed dryer to obtain a granular pesticide.

Example 6 Dimethylmonoisopropylnaphthalene of Example 5 30
Parts to 30 parts of diisopropyl naphthalene,
A granular pesticide was obtained.

Comparative Example 1 Dimethylmonoisopropylnaphthalene 10 of Example 1
Part was replaced with 10 parts of clay to obtain a granular pesticide.

Comparative Example 2 10 parts of dimethyldiisopropylnaphthalene of Example 2 was replaced with 10 parts of bentonite to obtain a granular pesticide.

Comparative Example 3 Monomethyl monoisopropyl naphthalene of Example 3
1.5 parts of clay was replaced with 1.5 parts of clay to obtain a granular pesticide.

Comparative Example 4 15 parts of the diisopropylnaphthalene of Example 4 was replaced with 15 parts of clay to obtain a granular pesticide.

Comparative Example 5 Dimethyldiisopropylnaphthalene of Example 5 15.
Granules were obtained by replacing 3 parts of bentonite with 15.3 parts.

Comparative Example 6 Commercially available phenothiol (0.7%) and cimetrin (1.
5%) of the mixed granules was applied to one place in the center of the test area.

Comparative Example 7 Commercially available phenothiol (0.7%) and cimetrin (1.
5%) of the mixed granules were uniformly processed over the entire test area.

Test Example 1 (diffusion test) A sample prepared according to Example 1 was prepared in the center (point A) of a test section (water depth 5 cm) having an area of 9 m ² (3 m × 3 m). 27-7.2g was processed. The granules used as a comparison agent were sprayed on the entire surface of the paddy field and in the center of the ward (A
Point) Two methods of treatment at one place were performed.

1.5 hours and 3 hours after the treatment, 20 ml of water was collected from the center (point A) and the four corners (points B to E) of the test area to a water depth of 5 cm to the water surface, respectively. The pesticide active ingredient concentration in water was analyzed by HPLC.

The water was collected at an inner diameter of 1 cm and a length of 8 cm.
Using the glass tube of No. 3, gently insert the glass tube into the surface water to a depth of 5 cm, put a rubber stopper on the upper part of the glass tube, and gently pull out to collect about 4 ml of the surface water. This operation is repeated 5 times, and a total of 20 ml of water is collected at each point. The results are shown in Table 1.

[0058]

[Table 1]

Test Example 2 (Herbicidal effect and paddy rice phytotoxicity test) A test plot having a size of 100 m ² (10 m × 10 m) was prepared in one paddy field, and Tainubie seeds (30 g), firefly seeds (10 g), and azena seeds ( 3g), eel seeds (3g)
The seeds were uniformly sown on the entire surface of each test plot, and after substituting, paddy rice (variety: Nipponbare 2 leaf stage seedling) was mechanically transplanted. When these weeds reached the 2-3 leaf stage, the granular pesticides prepared according to Examples 5 to 6 were tested so that the amount of the pesticide active ingredient used per 10 are as shown in Table 2. The center of the ward was introduced.

The investigation was carried out 30 days after the treatment with the drug, and a total of 5 points from 5 points in the center (point A) and 4 corners (points B to E) of the test area
Weeds that survived in m ² were sampled, their dry weight (g) was measured, and the average weeding rate (%) of the 5 groups was determined by the following formula.

Regarding the degree of phytotoxicity to paddy rice,
An objective survey was conducted according to the following criteria. Table 2 shows the results.

[0062]

(Equation 1)

[0063]

[0064]

[Table 2]

[0065]

EFFECTS OF THE INVENTION When the granular pesticide of the present invention is sprayed on a paddy field in a submerged area, the granule disintegrates within several hours, and the pesticide active ingredient is eluted into water and spreads.

Therefore, if sprayed at regular intervals, it spreads in water to a uniform concentration and exhibits excellent controlling activity.

Since the solvent used in the present invention does not have a problem of odor, it can be used with confidence.

Claims (2)

[Claims] 1. A granular pesticide that spreads in water, comprising an agrochemical active ingredient, an isopropylnaphthalene solvent represented by the following formula, and a solid carrier. Embedded image (In the formula, m represents an integer of 0 to 2 and n represents an integer of 1 to 2, and the position of these substituents does not matter.) 2. An underwater spreading agent for a granular pesticide, comprising an isopropylnaphthalene-based solvent represented by the following formula. Embedded image (In the formula, m represents an integer of 0 to 2 and n represents an integer of 1 to 2, and the position of these substituents does not matter.)