JP3499376B2 - Aqueous suspension pesticide stabilizer and aqueous suspension pesticide - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to pesticidal, more particularly, to a good pesticidal the suspension stability and redispersibility in storage over long periods of pesticidal.

[0002]

2. Description of the Related Art In recent years, the amount of an agricultural chemical in the form of an aqueous suspension (also called a flowable agent) in which an agricultural chemical active ingredient is dispersed in water as a solvent has been increasing. This aqueous suspension pesticide is
Since it has low flammability and odor, it has advantages over emulsion in terms of safety and environmental hygiene. However, during long-term storage of the preparation, dispersoids composed of the agrochemical active ingredient and auxiliary ingredient dispersed in water tend to settle and separate. At times, there is a demerit such that the re-dispersion becomes difficult even if the sedimented layer is hardened and stirred.

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

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

JP-A-2-188502 discloses an aqueous suspension biocide composition prepared by suspending water-insoluble biocide particles having a melting point of 15 to 80 ° C. in water, which comprises isophthalic acid ester, terephthalic acid ester and triester. Mellitic acid ester, pyromellitic acid ester, naphthoic acid ester,
One or more selected from higher fatty acid esters and adipic acid esters are used in a weight ratio of 0.
An aqueous suspension biocide which contains 1 to 2.0 and does not cause precipitation of crystals during storage.

As an effective 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 2,1,1,3-benzothiadiazin-4 (3H) -one-2,2-dioxide and a surfactant,
A transparent and uniform aqueous concentrated microemulsion form characterized by containing water and one or more selected from the group consisting of ethoxylated styrylphenols, aromatic compounds as organic solvents, ketones and fatty acid esters. Herbicide composition, etc.

[0007]

Regarding the agricultural chemicals in the form of an aqueous suspension, various improved techniques have been proposed so far in order to improve the suspendability and dispersibility to improve the long-term storage stability as described above. Has been provided. However, it is still not enough.

Accordingly, the present invention is the storage stability of the long period, and to provide a redispersible good pesticidal in water.

[0009]

[Means for Solving the Problems] The inventors of the present invention have conducted extensive studies for the purpose of developing a technique for preventing sedimentation of dispersoids in pesticides in aqueous suspension. As a result, by adding a vegetable oil fatty acid alkyl ester to an aqueous suspension pesticide, suspension properties and dispersibility are improved, long-term storage stability is improved, and an aqueous suspension pesticide with good redispersibility is obtained. I found out.

[0010]

Therefore, the gist of the first aspect of the present invention is that the pesticide active ingredient is contained in an amount of 1 part by weight of the pesticide active ingredient.
And 0.1 to 30 parts by weight of vegetable oil fatty acid alkyl ester, water-soluble polymer compound, surfactant and water.

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

Therefore, the gist of the second aspect of the present invention is that the pesticidal active ingredient and 1 part by weight of the pesticidal active ingredient are used.
And a vegetable oil fatty acid alkyl ester in the range of 0.15 to 30 parts by weight , a water-soluble polymer compound, a surfactant and water, and the formulation viscosity is 100 to 1000 at 25 ° C.
It is a pesticide in the form of an aqueous suspension, which is characterized by having mPa · S.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention is carried out as follows.

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

Examples of the vegetable oil include linseed oil, edible oil, hemp 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 can be mentioned.

As a main component of vegetable oil fatty acid, in linseed oil, linoleic acid, linolenic acid, oleic acid, palmitic acid, myristic acid, edible oil, in hemp oil, linoleic acid,
For 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, arachidic acid, rapeseed oil, erucic acid, linoleic acid, linoleic acid, oleic acid, palmitic acid Acid, peanut oil, oleic acid, arachidic acid, linoleic acid, palmitic acid, stearic acid, camellia oil, oleic acid, linoleic acid, olive oil, oleic acid, palmitic acid, linoleic acid, stearic acid, corn oil, Linoleic acid, Oleic acid, Linoleic acid, Mi 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,
Palmitic acid, stearic acid, arachidic acid, castor oil include ricinoleic acid and linoleic acid, and palm oil includes linoleic acid, capric acid, caprylic acid, myristic acid, palmitic acid, stearic acid, oleic acid and the like.

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

Examples of vegetable oil fatty acid alkyl esters obtained from such vegetable oil fatty acids and alcohols 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, and linseed oil fatty acid methyl ester. , Corn oil fatty acid methyl ester, cottonseed oil fatty acid methyl ester, sesame oil fatty acid ethyl ester, sunflower oil fatty acid methyl ester, eno oil fatty acid butyl ester, rapeseed oil fatty acid methyl ester and the like. And, as particularly preferable examples, 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 ester,
These are sesame oil fatty acid ethyl ester, sunflower oil fatty acid methyl ester, and green oil fatty acid butyl ester.

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

The amount of the vegetable oil fatty acid alkyl ester added to the pesticide in aqueous suspension is in the range of 0.15 to 30 parts by weight, preferably 2 to 20 parts by weight, per 1 part by weight of the pesticide active ingredient.

The pesticidally 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 commonly used as a pesticide.

Examples of insecticides CYAP, MPP, MEP, ECP, pirimiphos-methyl, diazinon, isoxathion, pyridafenthion, chlorpyrifos-methyl, chlorpyrifos, quilvar, marathon, PAP, dimethoate, thiomethone, ethylthiomethone, phosalone, PMP, DMTP, sulprofos, prothion, Profenofos, pyraclofos,
DDVP, monocrotophos, BRP, CVMP, dimethylvinphos, propaphos, acephate, DEP, EP
N, Ethion, NAC, MTMC, MIPC, BPM
C, PHC, XMC, ethiophene carb, pirimicarb, carbosulfan, benfuracarb, mesomil, oxamyl, thiodicarb, allethrin, resmethrin,
Permethrin, cypermethrin, cyhalothrin, cyfluthrin, fenpropatorin, tralomethrin, cycloprothrin, fenvalerate, flucitrinate, fluvalinate, etofenprox, cartap, thiocyclam, bensultap, diflubenzuron, teflubenzuron, chlorfluazuron, flufenoc. Threon, tebufenozide, buprofezin, benzoepin,
Imidacloprid, machine oil, Kelsen, amitraz,
Hexthiazox, fenbutatin oxide, fenpyroximate, debufenpyrad, pyridaben, etc.

Examples of bactericides Copper sulfate, quick lime, basic copper calcium sulfate, basic copper sulfate, basic copper chloride, cupric hydroxide, copper ammonium complex salt organic copper, nonylphenol sulfone copper, DBEDC, copper terephthalate, Sulfur, Zineb, Manneb, Manzeb, Ambam, Polycarbamate, Organic sulfur nickel salt, Propineb, Ziram, Thiuram, Thiadiazine, Captan, Sulfenic acid system, TPN, Fusalide, IBP, E
DDP, triclofosmethyl, pyrazophos, fosetyl,
Thiophanate methyl, thiabendazole, iprodione, vinclozolin, procymidone, fluorimide,
Mepronil, flutolanil, teclophthalam, penciclone, metalaxyl, oxadixyl, triadimefon, bitertanol, microbutanyl, hexaconazole, propiconazole, difenoconazole, ipconazole, imibenconazole, triflumizole, proclaros, pefrazoate, phenarimol, pyrifenox, pyrifenox. Dithianon, quinoxaline, D
PC, dimethymol, fursulfamide, benchazole, diclomedine, triazine, ferimzone, fluazinam, dimethofencarb, probenazole, isoprothiolane, tricyclazole, pyroquilon, oxolinic acid, iminoctadine acetate, blasticidin S, kasugamycin, polyoxin, validamycin A, streptomycin, PCNB, hydroxyisoxazole, ecromezole, metasulfocarb, etc.

Examples of herbicides 2,4-PA, MCP, MCPB, MCPP, phenothiole, clomeprop, naproanilide, phenoxapropethyl, fluazifop, quizalofop-ethyl, clomethoxynil, bifenox, IPC, fenmedifam, benchiocarb, Esprocarb, Molinate, Dimepiperate, Pyributicarb, DCP
A, alachlor, butachlor, pretilachlor,
Tenylchlor, bromobutide, mefenacet, napropamide, diphenamide, propyzamide, isoxaben, ashram, DCMU, linuron, dimuron,
Methyl daimuron, carbutyrate, isouron, tebutyuron, bensulfuron-methyl, pyrazosulfuron-ethyl, flazasulfuron, thifensulfuron, imazosulfuron, CAT, atrazine, cimetrin, promethrin, dimetamethrin, cyanadine, terbacil, bromacil, PAC, bentazone, oxadiazone, Pyrazolate, pyrazoxifene, benzophenap, trifluralin, bethrosine, pendimethalin, picloram, imazapyr, DPA, piperophos, butahomis, glyphosate, bialaphos, glyphosinate, aionoxynil, DBN, alloxidim, setoxydim, ACN,
Symmethyrin, benfresate, etc.

In the present invention, the content of the agrochemical active ingredient in the agrochemical suspension is usually in the range of 0.1 to 60% by weight,
It is preferably in the range of 5 to 50% by weight.

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

The water-soluble polymer compound used in the present invention includes the following.

Starch potato starch, wheat starch, dextrin, and the like.

Seaweeds sodium alginate, caranagin, etc.

[0031]Plant mucilage Locust bean gum, guar gum, tara gum, tamari
And gum, gum arabic, tragacanth, karaya
Mu, pectin, arabinogalactan, soybean curd extract
Released water-soluble polysaccharide (Soyafive ),Such.

Microbial mucilage xanthan gum, pullulan, lanzan gum, etc.

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

Fibrous microcrystalline cellulose, etc.

Others 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 these water-soluble polymer compounds added to the pesticide in the form of aqueous suspension 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 agrochemical active ingredient in water. And as such a surfactant,
Conventionally known nonionic surfactant, anionic surfactant,
A cationic surfactant, an amphoteric surfactant, etc. can be used.

Examples of nonionic surfactants Polyoxyethylene alkylaryl ethers (eg polyoxyethylene nonyl phenyl ether), polyoxyalkylene aryl phenyl ethers, polyoxyethylene styryl phenyl ethers, polyoxyethylene alkyl esters, polyoxyethylene Sorbitan alkylate, polyoxyalkylene glycol, polyoxyethylene phenyl ether polymer, etc.

Examples of anionic surfactants Lignin sulfonate, alkylaryl sulfonate, dialkyl sulfosuccinate, polyoxyethylene alkylaryl phosphate, polyoxyethylene alkylaryl ether sulphate, alkylnaphthalene sulfonate, polyoxyethylene. Styryl phenyl ether sulfate, etc.

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

In the present invention, one kind is used in such an amount that the content of these surfactants in the agricultural chemicals in the form of aqueous suspension 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 carrying out the present invention, it is important to adjust the viscosity of the preparation to a specific range to prepare a preparation. That is, the formulation viscosity at the time of preparation of the pesticidal aqueous suspension is
When it is less than 00 mPa · S (25 ° C), the suspension stability of the preparation gradually deteriorates. Therefore, the redispersibility in water also deteriorates.

Further, if it exceeds 1000 mPa · S, even if an attempt is made to discharge the formulation from a plastic bottle, the amount of the formulation adhering to the inner wall of the plastic bottle gradually increases, and it takes time to discharge from the bottle. . Therefore, the formulation viscosity is 100 to 1000 mPa.
-S, preferably 200-800 mPa-S (25 ° C)
Is.

In order to obtain such a formulation viscosity, the following may be done. That is, after mixing and dissolving the oily pesticidal active ingredient, the plant fatty acid alkyl ester and the surfactant, emulsifying and dispersing in predetermined water, or using a part of the surfactant in predetermined water, the solid pesticide active ingredient is dissolved. To the suspension-dispersed product, the mixture of the remaining surfactant and the plant fatty acid alkyl ester was added and dispersed, and the water-soluble polymer compound had a formulation viscosity at 25 ° C. of 100 to 1000 m.
The amount may be Pa · S, and the mixture may be stirred and mixed.

In addition to the above composition, the pesticidal composition of the present invention contains, if necessary, synthetic or natural mineral-based thickeners, antifreezing agents, antifoaming agents, antifungal agents, and antioxidants. You may add auxiliary agents, such as an agent and an ultraviolet ray inhibitor.

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

Further, as the antifreezing agent, specifically,
For example, ethylene glycol, propylene glycol, glycerin and the like can be mentioned, and as the antifoaming agent, a silicone-based or fatty acid-based one can be used, and an antifungal agent (antifungal / antiseptic preservative) Specifically, sorbic acid, potassium sorbate, p
-Chloro-metaxylenol, butyl p-oxybenzoate, etc. 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 agricultural chemicals in the form of an aqueous suspension 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 Water 36 parts, XMC 40 parts, pre-dissolved polyoxyalkylene aryl phenyl ether 5 parts and rice bran oil fatty acid methyl ester ("RCM-101", trade name of Nisshin Fine Chemical Co., Ltd.) 6 parts 3 parts of sodium lignin sulfonate, 5 parts of 2% xanthan gum aqueous solution and 5 parts of ethylene glycol were added to the mixed solution of
K homomixer (trade name of Tokushu Kika Kogyo Co., Ltd.) 5000 rpm. p. The mixture was stirred and mixed at m for 10 minutes to obtain an agricultural chemical in the form of an aqueous suspension having a formulation viscosity of 600 mPa · S (25 ° C).

Example 2 Prepared according to Example 1 except that 5 parts of the 2% xanthan gum aqueous solution of Example 1 was replaced with 5 parts of the 2% guar gum aqueous solution, and the aqueous suspension having a formulation viscosity of 530 mPa · S (25 ° C.) was used. A cloudy pesticide was obtained.

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

Example 4 6 parts of 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 2% xanthan gum aqueous solution. Was replaced with 4 parts, water with 36 parts by 20 parts, and 13 parts with a 3% colloidal hydrous aluminum silicate suspension were added, and the preparation was carried out in the same manner as in Example 1, and the formulation viscosity was 970 mPa · S. (25 ° C.) Aqueous suspension pesticide was obtained.

Example 5 6 parts of the rice bran oil fatty acid methyl ester of Example 1 was used as 7 parts of castor oil fatty acid methyl ester (produced by Toyokuni Oil Co., Ltd.), 5 parts of a 2% xanthan gum aqueous solution was added to 5 parts of a rhamsan gum aqueous solution, and 36 parts of water. Was prepared according to Example 1 except that 35 parts were replaced with 35 parts, and the formulation viscosity was 380 mPa · S.
(25 ° C.) Aqueous suspension pesticide was obtained.

Example 6 Water 39 parts, pre-dissolved marathon 20 parts, polyoxyethylene styryl phenyl ether 10 parts, calcium alkylbenzene sulfonate 5 parts and linseed oil fatty acid methyl ester 10 parts in a mixed solution 5 parts propylene glycol 2% xanthan gum aqueous solution 7 parts, 10
% Polyvinyl alcohol aqueous solution (4 parts) was added, and the mixture was mixed with a TK homomixer at 5000 rpm. p. The mixture was stirred and mixed at m for 10 minutes to obtain an agricultural chemical in the form of an aqueous 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 was added 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 were added to 12 parts of 2% guar gum aqueous solution. Prepared according to Example 6 except that the formulation viscosity was 950 mP.
An aqueous suspension pesticide of aS (25 ° C) was obtained.

Example 8 Water 37.6 parts, fusaride 30 parts, kasugamycin 2.4 parts, pre-dissolved polyoxyethylene nonylphenyl ether 5 parts, sodium alkylnaphthalene sulfonate 3 parts and cottonseed oil fatty acid methyl ester 1
5 parts of propylene glycol and 7 parts of gum arabic were added to the mixed solution of 0 parts, and the mixture was mixed with a TK homomixer at 5000 rpm.
p. Stir and mix for 10 minutes at a viscosity of 410 mPa.
-An aqueous suspension pesticide of S (25 ° C) was obtained.

Example 9 10 parts of the cottonseed oil fatty acid methyl ester of Example 8 was added to 10 parts of sesame oil fatty acid ethyl ester, and gum arabic 7
Prepared according to Example 8 except that 4 parts of 2% xanthan gum aqueous solution and 3 parts of 2% carboxymethyl cellulose aqueous solution were used, and the formulation viscosity was 510 mPa · S (25
Aqueous suspension of pesticide was obtained.

Example 10 Water 54 parts, pre-dissolved phenothiol 1 part, polyoxyethylene styryl phenyl ether 10 parts,
To a mixed solution of 5 parts of calcium alkylbenzene sulfonate 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 r.p.m. p. 10 in m
Mix and stir for minutes, and the formulation viscosity will be 120 mPa · S (25
Aqueous suspension of pesticide was obtained.

Example 11 Preparation was carried out in the same manner as in Example 10 except that 20 parts of sunflower oil fatty acid methyl ester of Example 10 were replaced with 30 parts of oil fatty acid butyl ester and 54 parts of water were replaced with 44 parts to prepare a preparation. 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, and 5 parts of a 2% xanthan gum aqueous solution was replaced with 3 parts, and further 3% colloidal hydrous aluminum magnesium silicate. A suspension was prepared in the same manner as in Example 10 except that 10 parts of the suspension was added to obtain a pesticidal aqueous suspension having a formulation viscosity of 380 mPa · S (25 ° C).

Comparative Example 1 Except for 6 parts of 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 was added.
An aqueous suspension pesticide having a preparation viscosity of 610 mPa · S (25 ° C.) was obtained in the same manner as in Example 1 except that 6 parts was changed to 40 parts.

Comparative Example 2 Prepared according to Example 1 except that 6 parts of the rice bran oil fatty acid methyl ester of Example 1 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 pesticide was obtained.

Comparative Example 3 2 parts of 2% xanthan gum aqueous solution of Example 4 was removed except for 3 parts.
% Colloidal hydrous aluminum silicate was prepared according to Example 4 except that 13 parts were used in 30 parts and 20 parts of water was changed to 7 parts, and an aqueous suspension having a formulation viscosity of 980 mPa · S (25 ° C.) was prepared. I got a pesticide.

Comparative Example 4 According to Example 5 except that 5 parts of the 2% rhamsan gum aqueous solution of Example 5 was removed, and 35 parts of water was added to 29 parts and 11 parts of 3% colloidal hydrous aluminum silicate magnesium was added. Prepared with a formulation viscosity of 390 mPa · S (25 ° C)
Aqueous suspension of pesticide was obtained.

Comparative Example 5 According to Example 6, except that 10 parts of the linseed oil fatty acid methyl ester of Example 6 was replaced with 7 parts of a 2% xanthan gum aqueous solution and 10 parts of water and 39 parts of water with 46 parts. Prepared,
An agrochemical suspension 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 corn oil fatty acid methyl ester of Example 7 was replaced with 20 parts of xylene. I got a pesticide.

Comparative Example 7 Except for 10 parts of cottonseed oil fatty acid methyl ester and 7 parts of gum arabic of Example 8, 13 parts of 3% colloidal hydrous magnesium silicate was added, and 37.6 parts of water was changed to 41.6 parts. Other than that was prepared according to Example 8, and the formulation viscosity was 420.
An agricultural chemical in the form of an aqueous suspension with mPa · S (25 ° C.) was obtained.

Comparative Example 8 10 parts of the sesame oil fatty acid ethyl ester of Example 9 was removed, 3 parts of liquid paraffin was added, and 37.6 parts of water was added to 4 parts.
The procedure of Example 9 was repeated except that the amount of the pesticide was changed to 4.6 parts to obtain a pesticidal aqueous suspension having a formulation viscosity of 530 mPa · S (25 ° C).

Comparative Example 9 Preparation was carried out 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.). ).

Comparative Example 10 Example 1 except that 20 parts of the sunflower oil fatty acid methyl ester of Example 10 was changed to 35 parts and 54 parts of water was changed to 39 parts.
0, and the formulation viscosity is 150 mPa · S (25
Aqueous suspension of pesticide was obtained.

Comparative Example 11 In Example 10 except that 20 parts of the sunflower oil fatty acid methyl ester of Example 10 was changed to 35 parts, 5 parts of a 2% xanthan gum aqueous solution was changed to 3 parts, and 54 parts of water was changed to 41 parts. Aqueous suspension pesticides having a formulation viscosity of 80 mPa · S (25 ° C.) were obtained in the same manner.

Next, the test examples show the usefulness of the agricultural chemicals in the form of an aqueous suspension of the present invention.

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

[0076]

[Equation 1]

Test Example 2 Viscosity Measurement The viscosity of the pesticidal aqueous suspension immediately after preparation was measured using a B-type viscometer [Co., Ltd.].
Made by Tokimec], rotor No2, rotation speed 12
r. p. m at a temperature of 25 ° C.

The results are 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 plastic bottle having a capacity of 500 ml, allowed to stand at 25 ° C. for 1 day, and the container was inverted 20 times, and then the container was inverted. Discharge pesticides in aqueous suspension. The end point is when the drug dropping interval from the mouth of the container is 10 seconds or more. The weight of the medicine discharged at this point was measured and expressed as a ratio (%) to the weight of the medicine filled in the container.

The results are shown in Tables 1 and 2.

[0081]

[Table 1]

[0082]

[Table 2]

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

[0084]

INDUSTRIAL APPLICABILITY The aqueous suspension pesticide of the present invention has an excellent suspension stability even when it is stored for a long period of time without the active ingredient and other auxiliary components suspended in water being separated and settled. And has good redispersibility in water. Therefore, it can be effectively used because it is easily discharged from the container.

Continuation of the front page (56) Reference JP-A-2-188502 (JP, A) JP-A-5-65201 (JP, A) JP-A-9-194305 (JP, A) International Publication 95/031898 (WO, A1) (58) Fields investigated (Int.Cl. ⁷ , DB name) A01N 1/00-65/02

Claims (2)

(57) [Claims] 1. A pesticide active ingredient, a vegetable oil fatty acid alkyl ester in the range of 0.15 to 30 parts by weight per 1 part by weight of the pesticide active ingredient, a plant mucilage or a mucilage by a microorganism.
An aqueous pesticide in the form of a suspension, which comprises an object , a surfactant and water. 2. A pesticide active ingredient, a vegetable oil fatty acid alkyl ester in the range of 0.15 to 30 parts by weight per 1 part by weight of the pesticide active ingredient, a plant mucilage or a viscous mucilage.
An aqueous pesticide in the form of a suspension, characterized in that the formulation viscosity is 100 to 1000 mPa · S at 25 ° C.