JPH107504A - Stabilizer for agrochemical of aqueous suspension type and agrochemical of aqueous suspension type stabilized thereby - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a stabilizer for an agrochemical of aqueous suspension type which is composed of alkyl esters of fatty acids derived from plant oil, and has excellent suspension stability, redispersibility and storage stability without precipitating any active agrochemical ingredient or any other subsidiary ingredient that is suspended in the aqueous suspension even after long-term storage. SOLUTION: This stabilizer for an agrochemical of aqueous suspension type comprises alkyl esters of fatty acids derived from plant oil, for example, methyl ester of rice bran oil fatty acid, preferably in a quantity of 2-20 pts.wt. (to 1 pt.wt. of active agrochemical ingredients). Furthermore, it is preferable to produce an agrochemical of aqueous suspension type that has 100-1000mPa.s of viscosity at 25 deg.C after the preparation of an aqueous agrochemical suspension from active agrochemical ingredients such as pyrimiphosmethyl, alkyl esters of plant oil fatty acids, a water-soluble polymer compound such as carboxymethyl cellulose, nonionic or other surfactants, and water.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an aqueous suspension pesticide, and more particularly to a stabilizer for an aqueous suspension pesticide and an aqueous suspension having good suspension stability and redispersibility even when stored for a long period of time. Related to pesticides.

[0002]

2. Description of the Related Art In recent years, the amount of aqueous suspended pesticides (also referred to as flowables) in which a pesticidal active ingredient is dispersed in water as a solvent has been increasing. This aqueous suspension pesticide
Emulsions are more advantageous than emulsions in terms of safety and environmental hygiene due to their low flammability and low odor. However, during the long-term storage of the preparation, the dispersoid composed of the pesticidal active ingredient and the auxiliary ingredient dispersed in water tends to settle and separate. At times, there is a demerit that the re-dispersion is difficult even if the sedimented layer is solidified and stirred.

Conventionally, various studies have been conducted on the types and amounts of auxiliary agents such as surfactants, thickeners and organic solvents in order to obtain a stable aqueous dispersion without such sedimentation or separation. Have been.

Until now, various esters have been used to improve the dispersibility of aqueous suspension pesticides. Examples thereof include the following.

An aqueous suspension biocide composition comprising water-insoluble biocide particles having a melting point of 15 to 80 ° C. suspended in water, comprising an isophthalic acid ester, a terephthalic acid ester, Meritic acid ester, pyromellitic acid ester, naphthoic acid ester,
One or more selected from higher fatty acid esters and adipic acid esters in a weight ratio of 0.1 to the biocide.
An aqueous suspended biocidal composition containing no crystals at a rate of 1 to 2.0, which does not precipitate during storage.

[0006] As an active ingredient, 2- [4- (2'-fluoro-4 "-"
Cyanophenoxy) phenoxy] propionic acid C _1-
C ₃ alkyl ester, and 3-isopropyl-1H
As a water-soluble salt of -2,1,3-benzothiadiazine-4 (3H) -one-2,2-dioxide and a surfactant,
A transparent and uniform aqueous concentrated microemulsion form comprising ethoxylated styrylphenol, one or more selected from the group consisting of aromatic compounds, ketones and fatty acid esters as an organic solvent, and water. Herbicidal compositions, etc.

[0007]

As described above, various techniques for improving the suspension and dispersibility of an aqueous suspension pesticide to improve the long-term storage stability and the like have been developed. Have been provided. However, it is still not enough.

Accordingly, an object of the present invention is to provide a stabilizing agent for an aqueous suspension pesticide and an aqueous suspension pesticide having long-term storage stability and good re-dispersibility in water.

[0009]

Means for Solving the Problems The present inventors have made intensive studies for the purpose of developing a technique for preventing sedimentation of dispersoids in an aqueous pesticide suspension. As a result, by adding the vegetable oil fatty acid alkyl ester to the aqueous suspension pesticide, the suspendability and dispersibility are improved, the long-term storage stability is improved, and the aqueous suspension pesticide with good redispersibility is obtained. I understood that.

[0010] Accordingly, the gist of the first aspect of the present invention resides in an aqueous suspension pesticide stabilizer comprising a vegetable oil fatty acid alkyl ester.

The gist of the second aspect of the present invention is that an aqueous agricultural pesticide characterized by comprising an agricultural chemical active ingredient, a vegetable oil fatty acid alkyl ester, a water-soluble polymer compound, a surfactant and water. It is in.

After further study, the aqueous suspension pesticide containing the vegetable oil fatty acid alkyl ester is adjusted by adding a water-soluble polymer compound and, if necessary, a thickener so as to have a viscosity in a specific range. It has been found that this results in better storage stability.

[0013] Accordingly, the gist of the third invention is that it comprises a pesticidal active ingredient, a vegetable oil fatty acid alkyl ester, a water-soluble polymer compound, a surfactant and water, and has a formulation viscosity of 100 to 1000 mPa at 25 ° C.
-An aqueous suspension pesticide characterized by being S.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention is implemented as follows.

The vegetable oil fatty acid alkyl ester used in the present invention has an effect of preventing sedimentation of the pesticidal active ingredient and other auxiliary ingredients contained in the aqueous suspension pesticide. Such a vegetable oil fatty acid alkyl ester is obtained by squeezing a plant or extracting with an organic solvent from a plant by a conventional method at 150 ° C.
Heat to about 280 ° C. and react with an alcohol in the presence of an esterification catalyst (such as sulfuric acid), or a commercially available product may be used.

The vegetable oils include, for example, linseed oil, linseed oil, hemp seed oil, tung oil, soybean oil, cottonseed oil, sesame oil, rapeseed oil,
Peanut oil, camellia oil, olive oil, corn oil, rice bran oil, sunflower oil, coconut oil, castor oil, and the like.

Vegetable oils As the main components of fatty acids, linseed oil includes linoleic acid, linolenic acid, oleic acid, palmitic acid, myristic acid, enamel oil, and linoleic acid in hemp seed oil.
Linolenic acid, oleic acid, palmitic acid, stearic acid, tung oil, eleostearic acid, oleic acid, palmitic acid, soybean oil, linoleic acid, oleic acid, palmitic acid, stearic acid, linoleic acid, myristic acid, cottonseed oil Linoleic acid, oleic acid, palmitic acid, stearic acid, myristic acid, sesame oil, linoleic acid, oleic acid, palmitic acid, stearic acid, arachinic acid, rapeseed oil, erucic acid, linoleic acid, linoleic acid, oleic acid, palmitic acid In acid, peanut oil, oleic acid, arachinic acid, linoleic acid, palmitic acid, stearic acid, in tsubaki oil, oleic acid, linoleic acid, olive oil, oleic acid, palmitic acid, linoleic acid, stearic acid, corn oil, Linoleic acid, oleic acid, linoleic acid, Cystine acid, palmitic acid, hexadecenoic acid, in rice bran oil, oleic acid, linoleic acid, linolenic acid, myristic acid, palmitic acid, stearic acid, a sunflower oil, oleic acid, linoleic acid,
Examples of palmitic acid, stearic acid, arachinic acid, and castor oil include ricinoleic acid, linoleic acid, and coconut oil include linoleic acid, capric acid, caprylic acid, myristic acid, palmitic acid, stearic acid, and oleic acid.

Examples of the alcohol to be reacted with the vegetable oil fatty acid include methanol having an alkyl group, ethanol, propanol, butanol and octanol.

The vegetable oil fatty acid alkyl ester obtained from such vegetable oil fatty acid and alcohol includes, for example, rice bran oil fatty acid methyl ester, tung oil fatty acid ethyl ester, soybean oil fatty acid methyl ester, castor oil fatty acid methyl ester, linseed oil fatty acid methyl ester And corn oil fatty acid methyl ester, cottonseed oil fatty acid methyl ester, sesame oil fatty acid ethyl ester, sunflower oil fatty acid methyl ester, apricot oil fatty acid butyl ester, and rapeseed oil fatty acid methyl ester. Particularly preferred examples include rice bran oil fatty acid methyl ester, tung oil fatty acid ethyl ester, soybean oil fatty acid methyl ester, castor oil fatty acid methyl ester, corn oil fatty acid methyl ester, rapeseed oil fatty acid methyl ester, linseed oil fatty acid methyl ester, cottonseed oil Fatty acid methyl esters,
Sesame oil fatty acid ethyl ester, sunflower oil fatty acid methyl ester, and seafood oil fatty acid butyl ester.

These vegetable oil fatty acid alkyl esters may be used alone or in combination of two or more.

The addition amount of the vegetable oil fatty acid alkyl ester to the aqueous suspension pesticide is in the range of 0.15 to 30 parts by weight, preferably 2 to 20 parts by weight, per part by weight of the pesticidal active ingredient.

The pesticidal active ingredients used in the present invention are exemplified below. However, the present invention is not limited to a specific pesticide active ingredient, and may be any one that is generally used as a pesticide.

Examples of insecticides CYAP, MPP, MEP, ECP, pirimiphosmethyl, diazinon, isoxathion, pyridafenthion, chlorpyrifosmethyl, chlorpyrifos, kilbar, marathon, PAP, dimethoate, thiometon, ethylthiometon, hosalon, PMP, DMTP, sulprophos, prothion, Profenofos, pyraclofos,
DDVP, monocrotophos, BRP, CVMP, dimethylvinphos, propaphos, acephate, DEP, EP
N, Ethion, NAC, MTMC, MIPC, BPM
C, PHC, XMC, Ethiophenecarb, Pirimicarb, Carbosulfan, Benfracarb, Mesomyl, Oxamyl, Thiodicarb, Aresulin, Resmethrin,
Permethrin, cypermethrin, cyhalothrin, cyfluthrin, fenpropatrin, tralomethrin, cycloprothrin, fenvalerate, flucitrinate, fluvalinate, etofenprox, cartap, thiocyclam, bensultap, diflubenzuron, teflubenzuron, chlorfluazuron, flufenoc Sullon, tebufenozide, buprofezin, benzoepine,
Imidacloprid, machine oil, kelsen, amitraz,
Hexythiazox, fenbutatin oxide, fenpyroximate, debufenpyrad, pyridaben, etc.

Examples of fungicides Copper sulfate, quicklime, basic calcium copper sulfate, basic copper sulfate, basic copper chloride, cupric hydroxide, copper ammonium complex salt organic copper, nonylphenol sulfone copper, DBEDC, copper terephthalate, Sulfur, zineb, maneb, manzeb, ambam, polycarbamate, organic sulfur nickel salt, propineb, ziram, thiuram, thiadiazine, captan, sulfenic acid, TPN, fusalide, IBP, E
DDP, triclofosmethyl, pyrazophos, fosetyl,
Thiophanate methyl, thiabendazole, iprodione, vinclozolin, procymidone, fluoroimide,
Mepronil, Flutranil, Teclophthalam, Pencyclon, Metalaxyl, Oxazixyl, Triadimefon, Bitertanol, Microbutanil, Hexaconazole, Propiconazole, Difenoconazole, Ipconazole, Imibenconazole, Triflumizole, Proclaroz, Pefrazoate, Fenarimol, Pyrifenox, Pyrifenox Dithianon, quinoxaline, D
PC, dimethylimol, flusulfamide, benzazole, diclomedine, triazine, ferimzone, fluazinam, dimethofencarb, probenazole, isoprothiolane, tricyclazole, pyroquilon, oxolinic acid, iminoctadine acetic acid, blasticidin S, kasugamycin, polyoxin, validamycin A, streptomycin, PCNB, hydroxyisoxazole, echromezole, metasulfocarb, and the like.

Examples of herbicides 2,4-PA, MCP, MCPB, MCPP, phenothiol, clomeprop, naproanilide, fenoxapropethyl, fluazifop, quizalofopethyl, clomethoxynil, bifenox, IPC, phenmedipham, benthiocarb, Esprocarb, molinate, dimepiperate, pyributicarb, DCP
A, arachlor, butachlor, pretilachlor,
Tenylchlor, bromobutide, mefenacet, napropamide, diphenamide, propizamide, isoxaben, ashram, DCMU, linuron, dymlone,
Methyldimuron, carbutyrate, isouron, tebuthiuron, bensulfuron-methyl, pyrazosulfuron-ethyl, furazasulfuron, thifensulfuron, imazosulfuron, CAT, atrazine, simethrin, promethrin, dimetamethrin, cyanazine, terbacil, bromacil, PAC, bentazon, oxazone, oxazone Pyrazolate, pyrazoxifene, benzofenap, trifluralin, besrosin, pendimethalin, picloram, imazapyr, DPA, piperophos, butahomis, glyphosate, bialaphos, glyphosinate, ioxynil, DBN, alloxydim, sethoxydim, ACN,
Sinmethylin, benfresate, etc.

In the present invention, the content of the pesticidal active ingredient in the aqueous suspension pesticide is usually in the range of 0.1 to 60% by weight,
Preferably it is in the range of 5 to 50% by weight.

The names of the above pesticidal active ingredients are the common names described in "Agrochemical Handbook 1994 Edition" (published by the Japan Plant Protection Association).

The following are examples of the water-soluble polymer compound used in the present invention.

[0029] Starch potato starch, wheat starch, dextrin, and the like.

Seaweed sodium alginate, calanagin, etc.

[0031]Plant mucilage Locust bean gum, guar gum, tara gum, tamari
Gum gum, gum arabic, gum tragacanth, karayaga
, Pectin, arabinogalactan, soybean okara
The released water-soluble polysaccharide (Soya Five ),Such.

Mucinous substances xanthan gum by microorganisms , pullulan, lanthanum, etc.

Protein casein, gelatin, soy protein, wheat gluten,
Plant protein degradation products, etc.

[0034] Fibrous microcrystalline cellulose and the like.

Others include carboxymethyl cellulose, sodium carboxymethyl starch, hydroxyethyl cellulose, carboxyethyl cellulose, methyl cellulose, hydroxypropyl cellulose, hydroxyethyl cellulose, polyvinyl alcohol, polyacrylic acid and its derivatives, and the like.

The amount of the water-soluble polymer compound to be added to the aqueous suspension pesticide is in the range of 0.01 to 10 parts by weight, preferably 0.05 to 5 parts by weight.

The surfactant used in the present invention is not particularly limited as long as it has a function of dispersing the pesticidal active ingredient in water. And as such a surfactant,
Conventionally known nonionic surfactants, anionic surfactants,
Cationic surfactants, amphoteric surfactants and the like can be used.

Examples of nonionic surfactants Polyoxyethylene alkyl aryl ether (eg, polyoxyethylene nonyl phenyl ether), polyoxyalkylene aryl phenyl ether, polyoxyethylene styryl phenyl ether, polyoxyethylene alkyl ester, polyoxyethylene Sorbitan alkylate, polyoxyalkylene glycol, polyoxyethylene phenyl ether polymer, and the like.

Examples of anionic surfactants Lignin sulfonate, alkyl aryl sulfonate, dialkyl sulfosuccinate, polyoxyethylene alkyl aryl phosphate, polyoxyethylene alkyl aryl ether sulfate, alkyl naphthalene sulfonate, polyoxyethylene Styryl phenyl ether sulfate, and the like.

Cationic and amphoteric surfactants
Examples of alkyl amines, quaternary ammonium salts, alkyl betaines, amine oxides, and the like.

In the present invention, one type of surfactant is used in an amount such that the content of these surfactants in the aqueous suspension pesticide is 0.2 to 30% by weight, preferably 0.5 to 20% by weight. Alternatively, two or more kinds can be used in combination.

In practicing the present invention, it is important to adjust the viscosity of the preparation so as to be in a specific range and formulate the preparation. That is, when the formulation viscosity of the aqueous suspension pesticide is 1
If it is lower than 00 mPa · S (25 ° C.), the suspension stability of the preparation gradually deteriorates. Therefore, the re-dispersibility in water also deteriorates.

On the other hand, if the pressure exceeds 1000 mPa · S, there are disadvantages in that, even if the preparation is to be discharged from the plastic bottle, the amount of the preparation adhering to the inner wall of the plastic bottle gradually increases and it takes time to discharge the preparation from the bottle. . Therefore, the formulation viscosity is 100-1000 mPa
· S, preferably 200 to 800 mPa · S (25 ° C)
It is.

To obtain such a formulation viscosity, the following method may be used. That is, after mixing and dissolving the oily pesticidal active ingredient, the vegetable fatty acid alkyl ester and the surfactant, the mixture is dissolved or emulsified in predetermined water or a solid pesticidal active ingredient using a part of the surfactant in predetermined water. Is suspended and dispersed in the mixture, and the remaining mixture of the surfactant and the fatty acid alkyl ester is added and dispersed, and the water-soluble polymer compound has a formulation viscosity at 25 ° C of 100 to 1000 m.
It may be added in such an amount as to give Pa · S, followed by stirring and mixing.

The aqueous suspension pesticide of the present invention may further comprise, if necessary, a synthetic or natural mineral-based thickener, an antifreezing agent, an antifoaming agent, an antibacterial agent, an antioxidant, in addition to the above-mentioned composition. Auxiliaries such as agents and UV inhibitors may be added.

Specific examples of natural mineral-based thickeners include colloidal hydrous aluminum silicate, colloidal hydrous magnesium silicate, and colloidal hydrous aluminum magnesium silicate. Examples of the synthetic mineral-based thickener include colloidal hydrated silicate synthesized from inorganic compounds including Si, Mg, Al, etc., and smecton (trade name of Kunimine Industries Co., Ltd.), synthetic smectite (Trade name of Corp Chemical Co., Ltd.). These synthetic or natural mineral-based thickeners can be used alone or in combination of two or more in such an amount that the content is 0.05 to 10% by weight.

As the antifreezing agent, specifically,
For example, ethylene glycol, propylene glycol, glycerin and the like can be mentioned. As the antifoaming agent, silicone-based or fatty acid-based ones can be used, and anti-foaming agents (antifungal / preservative preservatives) Specifically, sorbic acid, potassium sorbate, p
-Chloro-meta-xylenol, butyl p-oxybenzoate and the like can be used.

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

[0049]

EXAMPLES Next, the aqueous suspension pesticide of the present invention will be described more specifically with reference to examples, but the present invention is not limited to these examples.

In the following Examples and Comparative Examples, “parts” means “parts by weight”.

Example 1 36 parts of water, 40 parts of XMC, 5 parts of previously dissolved polyoxyalkylenearylphenyl ether and 6 parts of rice bran oil fatty acid methyl ester ("RCM-101", trade name of Nisshin Fine Chemical Co., Ltd.) 3 parts of sodium ligninsulfonate, 5 parts of a 2% xanthan gum aqueous solution and 5 parts of ethylene glycol were added to the mixture of
Kr homomixer (trade name, manufactured by Tokushu Kika Kogyo Co., Ltd.) at 5000 r. p. m for 10 minutes to obtain an aqueous pesticide suspension having a formulation viscosity of 600 mPa · S (25 ° C.).

Example 2 An aqueous suspension having a formulation viscosity of 530 mPa · S (25 ° C.) was prepared in the same manner as in Example 1 except that 5 parts of a 2% aqueous xanthan gum solution of Example 1 was replaced with 5 parts of a 2% aqueous guar gum solution. A cloudy pesticide was obtained.

Example 3 6 parts of the rice bran oil fatty acid methyl ester of Example 1 were added to 10 parts of tung oil fatty acid ethyl ester, 5 parts of a 2% xanthan gum aqueous solution to 7 parts of gum arabic, and 36 parts of water to 30 parts.
Aqueous suspension-type pesticides having a formulation viscosity of 590 mPa · S (25 ° C.) were prepared in the same manner as in Example 1 except that the parts were replaced.

Example 4 6 parts of the rice bran oil fatty acid methyl ester of Example 1 was added to 10 parts of soybean oil fatty acid methyl ester (“SBM-101”, trade name of Nisshin Fine Chemical Co., Ltd.) and 5 parts of a 2% xanthan gum aqueous solution. Was prepared in the same manner as in Example 1, except that 4 parts were replaced with 36 parts of water and 20 parts of water, and 13 parts of a 3% colloidal hydrous aluminum silicate suspension was added. The formulation viscosity was 970 mPa · S (25 ° C) aqueous pesticide suspension was obtained.

Example 5 The rice bran oil fatty acid methyl ester of Example 1 (6 parts) was castor oil fatty acid methyl ester (7 parts), a 2% xanthan gum aqueous solution (5 parts) and a ramzan gum aqueous solution (5 parts) and water (36) were added. Was prepared according to Example 1 except that the parts were changed to 35 parts, and the formulation viscosity was 380 mPa · S
(25 ° C) aqueous pesticide suspension was obtained.

Example 6 A mixture of 39 parts of water, 20 parts of previously dissolved marathon, 10 parts of polyoxyethylene styrylphenyl ether, 5 parts of calcium alkylbenzenesulfonate and 10 parts of linseed fatty acid methyl ester was mixed with 5 parts of propylene glycol. 7 parts of 2% xanthan gum aqueous solution, 10
% Polyvinyl alcohol aqueous solution (4 parts), and the mixture was mixed with a TK homomixer at 5000 rpm. p. m for 10 minutes to obtain an aqueous pesticide suspension having a formulation viscosity of 560 mPa · S (25 ° C.).

Example 7 10 parts of linseed oil fatty acid methyl ester of Example 6 were converted to 20 parts of corn oil fatty acid methyl ester, 4 parts of 10% polyvinyl alcohol aqueous solution and 7 parts of 2% xanthan gum aqueous solution to 12 parts of 2% guar gum aqueous solution. Except for the replacement, it was prepared according to Example 6, and the formulation viscosity was 950 mP.
An aqueous suspension of a.S (25 ° C.) pesticide was obtained.

Example 8 37.6 parts of water, 30 parts of fusalide, 2.4 parts of kasugamycin, 5 parts of polyoxyethylene nonylphenyl ether previously dissolved, 3 parts of sodium alkylnaphthalenesulfonate and 1 part of cottonseed oil fatty acid methyl ester
To 5 parts of the mixture, 5 parts of propylene glycol and 7 parts of gum arabic were added, and the mixture was mixed at 5,000 rpm with a TK homomixer.
p. m for 10 minutes, and the formulation viscosity is 410 mPa
-An aqueous suspension pesticide of S (25 ° C) was obtained.

Example 9 10 parts of the fatty acid methyl ester of cottonseed oil of Example 8 were added to 10 parts of ethyl ester of sesame oil fatty acid, and gum arabic was used.
Was prepared according to Example 8, except that 4 parts of a 2% aqueous xanthan gum solution and 3 parts of a 2% carboxymethylcellulose aqueous solution were used, and the formulation viscosity was 510 mPa · S (25 parts).
° C) in aqueous suspension.

Example 10 54 parts of water, 1 part of phenothiol previously dissolved, 10 parts of polyoxyethylene styryl phenyl ether,
To a mixed solution of 5 parts of calcium alkylbenzenesulfonate and 20 parts of sunflower oil fatty acid methyl ester, 5 parts of ethylene glycol and 5 parts of a 2% xanthan gum aqueous solution were added, and the mixture was mixed with a TK homomixer at 5000 rpm. p. 10 in m
Mixing and stirring for minutes, the formulation viscosity is 120 mPa · S (25
° C) in aqueous suspension.

Example 11 Preparation was carried out according to Example 10, except that 20 parts of the sunflower oil fatty acid methyl ester of Example 10 was replaced with 30 parts of oil fatty acid butyl ester and 54 parts of water were replaced with 44 parts. An aqueous suspension pesticide having a viscosity of 280 mPa · S (25 ° C.) was obtained.

Example 12 20 parts of the sunflower oil fatty acid methyl ester of Example 10 was replaced with 30 parts of rapeseed oil fatty acid methyl ester, 5 parts of a 2% xanthan gum aqueous solution was replaced with 3 parts, and 3% colloidal hydrous aluminum magnesium magnesium silicate was further added. An aqueous suspension pesticide having a formulation viscosity of 380 mPa · S (25 ° C.) was obtained in the same manner as in Example 10 except that 10 parts of the suspension was added.

Comparative Example 1 Except for 6 parts of the rice bran oil fatty acid methyl ester of Example 1, 5 parts of a 2% xanthan gum aqueous solution was added to 7 parts, and 3 parts of water were added.
An aqueous suspension pesticide having a formulation viscosity of 610 mPa · S (25 ° C.) was prepared in the same manner as in Example 1 except that 6 parts was changed to 40 parts.

COMPARATIVE EXAMPLE 2 A rice bran oil fatty acid methyl ester was prepared in the same manner as in Example 1 except that 6 parts of the fatty acid methyl ester was changed to 4 parts and 36 parts of water was changed to 38 parts, and the formulation viscosity was 520 mPa · S. An aqueous suspension of the pesticide was obtained.

Comparative Example 3 Except for 4 parts of the 2% xanthan gum aqueous solution of Example 4,
% Colloidal hydrous aluminum silicate was prepared in the same manner as in Example 4 except that 30 parts were used for 30 parts, and 20 parts for water were used for 7 parts. An aqueous suspension having a formulation viscosity of 980 mPa · S (25 ° C.) Pesticides obtained.

Comparative Example 4 Example 5 was repeated except that 5 parts of a 2% aqueous ramzan gum solution of Example 5 was used, and 35 parts of water was added to 29 parts, and 11 parts of 3% colloidal hydrous aluminum magnesium silicate was added. 390 mPa · S (25 ° C)
Aqueous suspension pesticide was obtained.

Comparative Example 5 The procedure of Example 6 was repeated except that 10 parts of the oil fatty acid methyl ester were replaced with 7 parts of a 2% xanthan gum aqueous solution and 10 parts of water were replaced with 10 parts and 46 parts of water. Prepared,
An aqueous suspension pesticide having a formulation viscosity of 570 mPa · S (25 ° C.) was obtained.

Comparative Example 6 An aqueous suspension having a formulation viscosity of 950 mPa · S (25 ° C.) was prepared in the same manner as in Example 7 except that 20 parts of xylene was replaced by 20 parts of corn oil fatty acid methyl ester of Example 7. Pesticides obtained.

COMPARATIVE EXAMPLE 7 Except for 10 parts of the fatty acid methyl ester of cottonseed oil and 7 parts of gum arabic of Example 8, 13 parts of 3% colloidal hydrous magnesium silicate was added to make 37.6 parts of water 41.6 parts. Were prepared according to Example 8, except that the formulation viscosity was 420
An aqueous suspended pesticide having mPa · S (25 ° C.) was obtained.

COMPARATIVE EXAMPLE 8 Except for 10 parts of sesame oil fatty acid ethyl ester of Example 9, 3 parts of liquid paraffin was added, and 37.6 parts of water was added to 4 parts.
An aqueous pesticide having a formulation viscosity of 530 mPa · S (25 ° C.) was obtained in the same manner as in Example 9 except that the amount was 4.6 parts.

Comparative Example 9 A preparation was prepared in the same manner as in Example 10 except that 5 parts of the 2% xanthan gum aqueous solution of Example 10 was changed to 30 parts, and 54 parts of water was changed to 29 parts, and the formulation viscosity was 1200 mPa · S (25 ° C.). ) Was obtained.

Comparative Example 10 Example 1 was repeated except that 35 parts of sunflower oil fatty acid methyl ester and 35 parts of water of Example 10 were used.
0 and a formulation viscosity of 150 mPa · S (25
° C) in aqueous suspension.

Comparative Example 11 The procedure of Example 10 was repeated except that 20 parts of the sunflower oil fatty acid methyl ester of Example 10 was used in 35 parts, 5 parts of a 2% xanthan gum aqueous solution in 3 parts, and 54 parts of water in 41 parts. An aqueous suspension pesticide having a formulation viscosity of 80 mPa · S (25 ° C.) was prepared according to the method described above.

Next, the usefulness of the aqueous pesticide suspension of the present invention is shown by test examples.

Test Example 1 Storage stability test The prepared aqueous suspension pesticide was used in a volume of 30 ml (φ17 mm ×
30 ml was put into a test tube (length: 180 mm), sealed, and allowed to stand in a constant temperature room at 20 ° C. or 40 ° C. And
After 3 months at 20 ° C. (corresponding to storage at room temperature for 3 months) and after 3 months at 40 ° C. (corresponding to storage at room temperature for 3 years), the formulation in a test tube Settles in the lower layer, and the water layer (upper layer) formed in the upper layer and the height (c
m) was measured and calculated by the following equation.

[0076]

(Equation 1)

Test Example 2 Viscosity Measurement The viscosity of the aqueous suspension pesticide immediately after preparation was measured using a B-type viscometer [manufactured by
Tokimec], rotor No. 2 and rotation speed 12
r. p. m at a temperature of 25 ° C.

The results are as shown in Tables 1 and 2.

Test Example 3 Discharge test 450 ml of the aqueous suspension pesticide immediately after preparation was placed in a 500 ml plastic bottle, and after standing at 25 ° C. for 1 day, the container was inverted 20 times and then the container was inverted. Discharge the aqueous pesticide suspension. The end point is when the interval of dropping the medicine from the mouth of the container becomes 10 seconds or more. At this time, the weight of the drug discharged was measured and expressed as a percentage (%) with respect to the weight of the drug filled in the container.

The results are as shown in Tables 1 and 2.

[0081]

[Table 1]

[0082]

[Table 2]

Note) In Tables 1 and 2, “POA” in the column of “Surfactant” is “polyoxyalkylene”, “POE” is “polyoxyethylene”, and “E” in the column of “Others”
"G" is "ethylene glycol" and "PG" is "propylene glycol".

[0084]

The aqueous suspension pesticide of the present invention has excellent suspension stability, even when stored for a long period of time, without separation and sedimentation of the pesticide active ingredient and other auxiliary ingredients suspended in water. Having good redispersibility in water. Therefore, it is easy to discharge from the container and can be used effectively.

Claims (3)

[Claims] 1. A stabilizer for an aqueous pesticide suspension, comprising a vegetable oil fatty acid alkyl ester. 2. An aqueous suspension pesticide comprising an active ingredient of a pesticide, an alkyl ester of a vegetable oil fatty acid, a water-soluble polymer compound, a surfactant and water. 3. A composition comprising a pesticidal active ingredient, a vegetable oil fatty acid alkyl ester, a water-soluble polymer compound, a surfactant and water, and having a formulation viscosity of 100 to 1000 mPa at 25 ° C.
-An aqueous suspension pesticide characterized by being S.