JPH0733606A - Agrochemical for application in water surface - Google Patents

Abstract

PURPOSE:To provide the agrochemical good in diffusibility in water, designed to directly drip into paddy field from its container without dilution with water. CONSTITUTION:The agrochemical comprising (A) a bactericidally active ingredient and/or insecticidally active ingredient, (B) a nonionic surfactant 10-15 in HLB number, (C) a thickening agent and (D) water, having the following characteristics: (1) specific gravity at 25 deg.C: 0.95-1.05; (2) viscosity: 200-1000mPa.s; and (3) surface tension at 20 deg.C: 35-65mN/m. This agrochemical is good in storage stability for a long period of time, also high in diffusibility of the component A on the paddy surface and underwater, therefore, bringing no chemical injuries on field crop and having excellent effect on disease and insect pests.

Description

Detailed Description of the Invention

[0001]

[Object of the Invention]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pesticide formulation for water surface application which can be sprayed by dropping the formulation into a paddy field as it is without diluting it with water.

[0002]

2. Description of the Related Art Up to now, several flowable agents in which herbicidal active ingredients are suspended and dispersed in water have been known as pesticide formulations for water surface application. For example, the water solubility is 10
An aqueous suspension preparation in which a herbicide drug substance of 0 ppm (25 ° C.) or less is suspended and dispersed in water using a surfactant (JP-A-62-62).
-45001), a finely water-insoluble herbicidal active ingredient of 10 μm or less is suspended in water, the viscosity is 180 to 500 centipoise (20 ° C.), and the initial water surface spreading speed is 4.0 cm.
/ Sec (20 ° C) or more, surface tension is 25.0 to 31.0 dyn
A water-suspended paddy field herbicide having a physical property of e / cm (25 ° C.) (JP-A-62-87501), having an average particle size of 0.1.
A herbicidal aqueous solution having a physical property of surface tension of 36 to 65 dyne / cm (25 ° C.), which is obtained by suspending a herbicidal active compound having a water solubility of 5 to 5 μm and a water solubility of 100 ppm (25 ° C.) or less in a surface active agent. Suspension formulation (Japanese Patent Laid-Open No. 63-107901), an aqueous herbicidal suspension formulation comprising a herbicidal active compound, a surfactant and water and having a physical property of surface tension of 36 to 65 dyne / cm (25 ° C.) ( JP-A-62-289502), containing a pyrazole herbicidal active ingredient and having a viscosity of 25.
Suspended herbicides for paddy fields having a physical property of 0 to 300 centipoise (Japanese Patent Laid-Open No. 62-84002), an oil obtained by dissolving a liquid herbicidal active ingredient in a petroleum-based aromatic solvent, and an interface with a solid herbicidal active ingredient. Dispersed in water with an activator, surface tension of 30-40 dyne / cm (20 ° C), viscosity of 50-20
0 centipoise, the contact angle to the leaf blade of the second paddy rice is 1
A herbicide for paddy rice having physical properties of 05 degrees or less (Japanese Patent Laid-Open No. 2-2
95903).

[0003]

A water-applied suspension formulation using water as a dispersion medium can be dripped directly into the paddy water without diluting it with water during spraying of the drug, so that it is safe, economical, labor-saving, etc. This is an excellent dosage form. However, even when the above-mentioned techniques for water-applied suspension preparations are used for the production of preparations containing various fungicidal active ingredients or insecticidal active ingredients, dispersoids settle during long-term storage, Insufficient diffusion of bactericidal active ingredients and insecticidal active ingredients in the control effect is not sufficiently exerted,
The wind blows the chemicals to the corners of the paddy fields, causing damage to the rice, which is not always satisfactory. Therefore, it has been desired to develop a pesticide formulation for water surface application, which is excellent in stability during storage of the formulation and in diffusibility of a bactericidal active ingredient or / and an insecticidal active ingredient in water in spraying, in place of the conventional suspension formulation for water application. The present invention is intended to provide a pesticide formulation for water surface application which meets these needs.

[0004]

Means for Solving the Problems The inventors of the present invention have conducted extensive studies to solve the above problems. As a result, it is composed of a bactericidal active ingredient or / and an insecticidal active ingredient, a nonionic surfactant of HLB10-15, a thickener and water, and the specific gravity of the preparation at 25 ° C is 0.95-1.05 and the viscosity is 200-. 1
000mPa ・ s, surface tension at 20 ℃ is 35-65mN
It was found that a pesticide formulation for water application having a physical property of / m has an excellent effect on stability during long-term storage and diffusion of a bactericidal active ingredient or / and an insecticidal active ingredient in water, and completed the present invention.

Next, the pesticide formulation for surface application of the present invention will be specifically described. The bactericidal active ingredient and the insecticidal active ingredient used in the present invention may be a single ingredient of the bactericidal active ingredient or the insecticidal active ingredient, or a mixture of both the ingredients. Any of these may be used as long as they are generally used in paddy fields, and one kind or two or more kinds may be used in combination. As the bactericidal active ingredient, for example, inorganic copper, organic nickel, thiuram, fusaride, IBP, EDDP, thiophanate methyl, benomyl, iprodione, mepronil, flutolanil, tecloftaum, pencyclone, metalaxyl, triflumizole, prochloraz, pefurazoate, blasticidin S, Examples include kasugamycin, polyoxin, validamycin, hydroxyisoxazole, metasulfocarb, organic arsenicals, benchazole, diclomedine, ferrimzone, probenazole, isoprothiolane, tricyclazole, and oxolinic acid.

As the insecticidal active ingredient, for example, MP
P, MEP, diazinon, isoxathion, pyridafenthion, chlorpyrifosmethyl, bamidthione, marathon, PAP, dimethoate, ethylthiomethone, P
MP, monocrotophos, BRP, CVMP, dimethylvinphos, propaphos, acephate, DEP, EPN,
NAC, MTMC, MIPC, BPMC, PHC, MP
MC, XMC, carbosulfan, benfuracarb, mesomemyl, thiodicarb, cycloprotoline, etofenprox, cartap, thiocyclam, bensultap, buprofezin, pyrethrin and the like. The names of these compounds are “Agricultural Chemicals Handbook, 1992 edition”.
It is a general name described in (Published by Japan Plant Protection Association). The content of these bactericidal active ingredients and insecticidal active ingredients in the preparation can be arbitrarily changed depending on the kinds of the bactericidal active ingredients and insecticidal active ingredients, but the content in the preparation is in the range of 0.1 to 60% by weight. Good.

Examples of the nonionic surfactant that can be used in the present invention include polyoxyethylene alkylaryl ether, polyoxyalkylene aryl phenyl ether, polyoxyethylene styryl phenyl ether,
Examples thereof include polyoxyethylene alkyl ester, polyoxyethylene sorbitan alkylate, polyoxyalkylene glycol, and polyoxyethylene phenyl ether polymer. These nonionic surfactants are H
It is in the range of LB 10 to 15, and one kind or two or more kinds of these may be used in combination. Even if the nonionic surfactant alone has an HLB value outside the range of 10 to 15,
HL by mixing two or more nonionic surfactants with different values
The B value may be in the range of 10-15. Further, even if a nonionic surfactant other than those exemplified here is used, the HLB10
Those having a number of up to 15 can be used in the present invention.

The content of the nonionic surfactant used in the preparation is 0.1 to 20% by weight, and the surface tension of the preparation may be added in the range of 35 to 65 mN / m.
Further, if necessary, a commonly used anionic surfactant may be used in combination without any problem. Examples of the anionic surfactant include lignin sulfonate, alkylaryl sulfonate, dialkyl sulfosuccinate,
There are polyoxyethylene alkylaryl phosphates, polyoxyethylene alkylaryl ether sulfates, alkylnaphthalene sulfonates, polyoxyethylene styryl phenyl ether sulfates, and the like, which are not limited to these, and one or more of these may be used. There is no problem if used together.

Thickeners that can be used in the present invention include, for example,
Xanthan gum, guar gum, tragacanth gum, gum arabic, casein, dextrin, carboxymethyl cellulose, carboxymethyl starch sodium salt, sodium alginate, hydroxyethyl cellulose, carboxyethyl cellulose, methyl cellulose, hydroxypropyl cellulose, hydroxyethyl cellulose,
Polyvinyl alcohol, polyacrylic acid and its derivatives,
Examples thereof include colloidal hydrous aluminum silicate, colloidal hydrous magnesium silicate, colloidal hydrous aluminum magnesium silicate, and the like. However, the present invention is not limited to these, and one or more of these may be used in combination. . The content of the thickener in the preparation is 0.1% to 0.1% of the preparation.
5.0% and a viscosity (25 ° C) of 200 to 1000 mPa
・ It should be added so that it becomes s.

Further, the specific gravity at 25 ° C. of the agricultural chemical preparation for water surface application of the present invention, which comprises a bactericidal active ingredient or / and an insecticidal active ingredient, a nonionic surfactant, a thickener and water, is 0.1.
When it is out of the range of 95 to 1.05, an oily substance such as vegetable oil or mineral oil may be added to adjust the specific gravity in the preparation.
The addition amount of these oily substances to the preparation may be about 0.1 to 30% by weight, but the addition amount may be appropriately changed depending on the specific gravity of the preparation before addition of the oily substance and the like. Examples of vegetable oils that can be used include soybean oil, coconut oil, rapeseed oil, tung oil, castor oil, sunflower oil, cottonseed oil, and the like, and mineral oils such as xylene, 1,3,5-trimethylbenzene, 1,2
-Dimethyl-4-ethylbenzene, methylnaphthalene,
Paraffins, 1-phenyl-1-xylylethane, 1
Examples include, but are not limited to, xylyl-1,3-diphenylbutane and the like, and one or more of these may be used in combination.

If necessary, as an auxiliary agent, for example, ethylene glycol, propylene glycol, glycerin or the like as an antifreezing agent, and a silicone-based antifoaming agent,
Alternatively, fatty acid-based substances and the like, sorbic acid, potassium sorbate, p-chloro-metaxylenol, butyl p-oxybenzoate, etc. as an antifungal agent, and antioxidants as stabilizers for bactericidal active ingredients and insecticidal active ingredients Agents, UV inhibitors, crystallization preventives, etc. may be added, respectively, if necessary, but are not limited to the auxiliary agents exemplified here.

[Action] The nonionic surfactant is a bactericidal active ingredient and an insecticidal active ingredient, which are uniformly dispersed in the preparation to stabilize it, and the bactericidal active ingredient and insecticidal active ingredient when the preparation is applied to the paddy field on the surface of the water. The thickener improves the storage stability of the agricultural chemical formulation for surface application over a long period of time and the diffusibility of the bactericidal active ingredient and the insecticidal active ingredient in the paddy water. In addition, the specific gravity of pesticide formulations applied on the water surface is 0.95-
1.05 is indispensable for suspending the bactericidal active ingredient and the insecticidal active ingredient to improve the diffusibility into water, and water is a dispersion medium for the surface-applied pesticide formulation.

[0013]

[Examples] Next, Examples 1 to 1 of the agricultural chemical preparation for surface application of the present invention
However, the present invention is not limited to these examples. In addition, all parts in the examples represent% by weight. Example 1 1 part of polyoxyethylene nonylphenyl ether of HLB13.3 was dissolved in 71.5 parts of water, 20 parts of probenazole raw material was added thereto, and Dynomil (Willy A. Bachofen) was added.
AG), and mixed and finely pulverized so that the average particle size of probenazole becomes 3 μm, and further added 7.5 parts of a 4% carboxymethylcellulose aqueous solution, using a three-one motor (Fuji Photo Film Co., Ltd.), Mix evenly, specific gravity 1.01, viscosity 200 mPa · s, surface tension 35 mN /
m water surface application pesticide formulation was obtained.

Example 2 5 parts of polyoxyethylene styryl phenyl ether of HLB 12.4 was dissolved in 70 parts of water, and Je was previously dissolved in it.
20 parts of probenazole finely pulverized to an average particle size of 3 μm using tO-mizer (manufactured by Seishin Enterprise Co., Ltd.) and 5 parts of a 2% xanthan gum aqueous solution were added, and a TK homomixer (manufactured by Nippon Special Kika Kogyo Co., Ltd.) was used to obtain 4000 r. 20 pm
After stirring for minutes, a pesticide formulation for water surface application having a specific gravity of 1.03, a viscosity of 300 mPa · s and a surface tension of 36 mN / m was obtained.

Example 3 10 parts of polyoxyethylene styryl phenyl ether of HLB 13.4 are dissolved in 20 parts of xylene. Then, while stirring 40 parts of water with a three-one motor at 330 rpm, the above solution was added dropwise for about 10 minutes to emulsify. In addition, Jet-O-mizer was used to average particle size 3μ
20 parts of finely pulverized probenazole and 10 parts of 4% colloidal hydrous aluminum silicate suspension were added to m, and stirred and mixed for 20 minutes at 4000 rpm with a TK homomixer,
A uniform pesticide formulation for water surface application having a specific gravity of 0.95, a viscosity of 800 mPa · s and a surface tension of 41 mN / m was obtained.

Example 4 6 parts of MEP, 6 parts of BPMC and 10 parts of polyoxyethylene propylene block polymer of HLB 15.0 are dissolved. And 58 parts of water is 330r.p. with three-one motor.
While stirring at m, add the above solution dropwise for about 10 minutes,
Emulsify. Further 10% polyvinyl alcohol solution 2
0 part was added, and the mixture was stirred with a TK homomixer at 4000 rpm for 10 minutes to obtain a uniform pesticide formulation for water surface application having a specific gravity of 1.05, a viscosity of 500 mPa · s and a surface tension of 45 mN / m.

Example 5 6 parts MEP, 6 parts BPMC, 10 parts soybean oil and HLB
Dissolve 5 parts of 12.4 polyoxyalkylene aryl phenyl ether. Then, while stirring 65.5 parts of water using a three-one motor at 330 rpm, the above solution was added dropwise for about 10 minutes to emulsify. Further, 7.5 parts of 4% carboxymethyl cellulose aqueous solution was added, and the mixture was stirred with a TK homomixer at 4000 rpm for 10 minutes,
A uniform pesticide formulation for water surface application having a specific gravity of 1.02, a viscosity of 640 mPa · s and a surface tension of 37 mN / m was obtained.

[0018]

EFFECTS OF THE INVENTION By carrying out the pesticide formulation for water surface application of the present invention, the following actions and effects are brought about. First
In addition, the storage stability of the preparation is good over a long period of time. Secondly, the dispersibility of the bactericidal active ingredient and the insecticidal active ingredient in the paddy water is good. Thirdly, since it is a formulation containing water as a dispersion medium, there is little danger of ignitability, flammability, etc., and there is no irritation to the human body and no environmental hygiene problems due to odor. Fourthly, it suffices to drop the medicine from the ridge while keeping it in the container without diluting it with water, which saves labor for spraying the medicine. Fifth
In addition, it shows a high control effect in flooded sewage fields and does not cause phytotoxicity to crops. Next, test examples are given to demonstrate the usefulness of the present invention.

[0019]

[Test Example] The physicochemical properties and diffusivity of the agricultural chemical preparation for surface application of the present invention were tested by the following test methods. In addition, the comparative examples were formulated according to the examples and tested. Comparative Example 1 1) Measurement of specific gravity: Measured at 25 ° C. using a pycnometer and calculated by the following formula.

[Equation 1] The results are shown in Tables 1 to 8.

2) Viscosity measurement: A B-type viscometer (manufactured by Tokyo Keiki Co., Ltd., rotor No. 1 or No. 2) was used at a rotor rotation speed of 12 rpm and a liquid temperature of 25 ° C. The results are shown in Tables 1 to 8.

3) Formulation stability: A surface-applied pesticide formulation prepared according to the example had a volume of 30 ml (diameter: 17 mm × length: 1).
Put 30 ml in a 80 mm) test tube, seal it tightly, and let it stand 5
The separated state after 3 months at 0 ° C was calculated by the following formula.

[Equation 2] The results are shown in Tables 1 to 8.

4) Surface tension measurement: The surface tension was measured by the Wilhelmy method at a temperature of 20 ° C. The results are shown in Tables 1 to 8.

5) Diffusion test: 2 m ² (1 m × 2 m) plastic vat was filled with water to a water depth of 3 cm, and 2 ml of the water surface-applied germicidal and insecticidal preparation obtained according to the example was placed in the center of the vat. Was dripped. After standing at 20 ° C. for 6 hours, the concentration of the bactericidal active ingredient or the insecticidal active ingredient in the four corners (A group to D group) and the center (E group) of the vat was measured. The diffusivity is shown by the following formula as a ratio to the theoretical water concentration when the bactericidal active ingredient or the insecticidal active ingredient is uniformly diffused in water in the vat.

[Equation 3] The results are shown in Tables 1 to 8.

[0024]

[Table 1]

[0025]

[Table 2]

[0026]

[Table 3]

[0027]

[Table 4]

[0028]

[Table 5]

[0029]

[Table 6]

[0030]

[Table 7]

[0031]

[Table 8]

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Office reference number FI technical display area // (A01N 57/14 47:10)

Claims (1)

[Claims] 1. A preparation comprising a bactericidal active ingredient or / and an insecticidal active ingredient, a nonionic surfactant of HLB 10 to 15, a thickener and water, and the specific gravity of the preparation at 25 ° C. is 0.95.
~ 1.05, viscosity 200 ~ 1000mPa · s, surface tension at 20 ℃ 35 ~ 65mN / m, pesticide formulation for water surface application.