JPH05339104A - Method for preparing diluted water-dispersible agent solution for treating seed - Google Patents

Abstract

PURPOSE:To obtain the subject solution free from the formation of hard cakes, not producing a large amount of precipitates and increased in dilution stability by adding a polyoxyalkylene higher fatty acid ester when an agricultural chemical water-dispersible agent is diluted with water. CONSTITUTION:When the water-dispersible agent used for treating seeds comprising an agricultural chemical active ingredient which is an insect pest control active ingredient or plant growth regulation active ingredient, a surfactant, an inactive carrier and, if necessary, auxiliary components such as a dispersing agent, a stabilizer and a pigment is diluted with water, a polyalkylene higher fatty acid ester is added to improve the stability of the diluted solution. The polyoxyalkylene higher fatty acid ester is the ester of a polyoxyalkylene such as polyethylene glycol or polypropylene glycol with a higher fatty acid such as arachic acid, behenic acid or lignoceric acid, and is added preferably in such an amount as giving a concentration of approximately 0.05-0.5wt.% in the diluted solution. Even when precipitates are generated during the dilution treatment, the precipitates are readily again dispersed under a mild stirring condition, and thereby the diluted solution has excellent dilution stability.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for preparing a water diluting solution of a wettable powder for agrochemicals for seed treatment.

[0002]

2. Description of the Related Art Conventionally, when a wettable powder containing a pesticidal active ingredient which is a pest controlling active ingredient or a plant growth regulating active ingredient is diluted with water, a large amount of the wettable powder is added to the diluent. There were cases where problems such as the formation of precipitates of the above and formation of hard cake were caused. In particular, since the water-diluting solution of a wettable powder used for seed treatment is used after diluting it with a relatively low-magnification ratio, usually 2 to 25 times by weight of water, when the diluting solution is sprayed on the seeds with a sprayer, etc. Problems such as clogging of the sprayer are likely to occur, and countermeasures have been demanded.

[0003]

SUMMARY OF THE INVENTION The present invention is to solve the above-mentioned problems, in which a hard cake is not formed in a diluting solution and a large amount of precipitate is not formed, even if a precipitate is formed. Even so, it provides a diluting solution having excellent dilution stability, which is easily redispersed under mild stirring conditions.
That is, in the present invention, when diluting a pesticide wettable powder with water, the stability of the diluted solution is increased by adding a higher fatty acid ester of polyoxyalkylene.

Examples of the higher fatty acid ester of polyoxyalkylene used in the present invention include higher fatty acid ester of polyoxyalkylene such as polyethylene glycol, polypropylene glycol and polyethylene polypropylene glycol.
For example, arachidic acid, which is a saturated fatty acid having 20 or more carbon atoms,
Behenic acid, lignoceric acid, cerotic acid, montanic acid,
Examples include straight chain higher fatty acids such as melissic acid, and in the present invention, these fatty acid esters may be used alone or in an arbitrary mixture of two or more kinds.

The amount of the higher fatty acid ester of polyoxyalkylene added when diluting a pesticidal wettable powder for seed treatment containing a pesticidal active ingredient which is a pest controlling active ingredient or a plant growth regulating active ingredient with water is Usually, the concentration in the diluent is about 0.001 to 1% by weight, preferably 0.0
It is about 5 to 0.5% by weight. As a method of adding the higher fatty acid ester of polyoxyalkylene, the higher fatty acid ester of polyoxyalkylene may be diluted in water in advance, and a wettable powder containing the agrochemical active ingredient may be added thereto, or the agrochemical active ingredient may be added. The higher fatty acid ester of polyoxyalkylene may be added to the water-diluted liquid of the wettable powder containing. In the case of the former method, in order to dilute the higher fatty acid ester of polyoxyalkylene in water, for example, the higher fatty acid ester of polyoxyalkylene is added to water in advance, and the mixture is heated and melted to form a minute amount of 1 to 30% by weight in water. It is preferable to disperse and suspend in particles, specifically, particles having a particle diameter of 0.001 to 1 μm, and appropriately dilute them with water before use. The water dispersion prepared in advance in this way is
KS-20 (trade name, manufactured by Ohara Palladium Chemical Co., Ltd.)
It is also possible to use a commercially available product such as.

In the present invention, the pesticidal wettable powder for seed treatment is usually (a) a pesticidal active ingredient which is a pest control active ingredient or a plant growth regulating active ingredient, (b) a surfactant,
(C) an inert carrier, and optionally a dispersant, a stabilizer,
A composition containing an auxiliary component such as a pigment, (a)
Examples of the active ingredient include the following compounds, which are active ingredients of fungicides or insecticides, but are not limited to these compounds. The proportion of these active ingredient compounds in the wettable powder is usually 1 to
It is 50% by weight. (1) 5-ethyl-5,8-dihydro-8-oxo-
1,3-Dioxolo [4,5-g] quinoline-7-carboxylic acid (2) (E) -1- (2,4-dichlorophenyl)-
4,4-dimethyl-2- (1,2,4-triazole-
1-yl) -1-penten-3-ol (3) 1- [1- [4-chloro-2- (trifluoromethyl) phenylimino] -2-propoxyethyl]-
1H-imidazole (4) 4- (2,2-difluoro-1,3-benzooxole-4-yl) pyrrole-3-carbonitrile (5) penta-4-enyl = N-furfuryl-N-
(Imidazol-1-ylcarbonyl) -DL-homoalaninate (6) O- (2,6-dichloro-4-methylphenyl) O, O-phosphorothioate (7) O, O-dimethyl O- (3- Methyl-4-nitrophenyl) phosphorothioate

Examples of the surfactant (b) include alkylsulfates such as sodium laurylsulfate, alkylarylsulfonates such as sodium alkylnaphthalenesulfonate, ligninsulfonates such as sodium ligninsulfonate, succinic acids, and the like. Anionic surfactants such as polyethylene glycol alkyl aryl ether sulfate ester salts, nonionic surfactants such as polyoxyethylene alkyl ethers, polyoxyethylene alkyl aryl ethers, polyoxyethylene aryl aryl ethers, and the like. The proportion of the activator in the wettable powder is usually 1 to 7% by weight.

Examples of the inert carrier (c) include kaolin clay, attapulgite clay, sericite clay, pyrophyllite clay, montmorillonite clay, zeolite, bentonite, acid clay, activated clay,
Examples include mineral carriers such as serpentinite, talc, diatomaceous earth, and pyrophyllite, inorganic salts such as sulfates, nitrates, and chlorides, inorganic carriers such as synthetic hydrous silicic acid, and organic carriers such as sugars, starch, and dextrin. The proportion of the inert carrier in the wettable powder is usually 20 to 98% by weight. In the wettable powder, in addition to the above-mentioned components, if necessary, other auxiliary components such as aromatic sulfonate formalin condensate, polymer dispersant such as polycarboxylic acid, BHT, isopropyl acid phosphate, etc. Stabilizers, diazo-based, phthalocyanine-based, anthraquinone-based, formazan-based dyes and the like may be included.

When seeds are treated with the wettable powder diluent according to the present invention, the wettable powder is usually diluted about 2 to 25 times with water containing higher fatty acid ester of polyoxyalkylene, and 100 parts by weight of seeds are used. On the other hand, about 1 to 10 parts by weight of the diluent is sprayed with a sprayer, or about 50 to 100 parts by weight of seeds is immersed in 100 parts by weight of the diluent. According to the method of the present invention, the respective effects depending on the type of each pesticide active ingredient can be obtained, and for example, the above-mentioned (1) to
(7) When using the agricultural chemical active ingredient is represented by, rice rice bacterial grain rot (Pseudomonu s glumae), rice standing bacterial grain rot (Pseudomonu s plantarii), rice褐条disease (Pseudo
monu s avanue ), scabbard disease of rice ( Gibberella f ujikur
oi ), sesame leaf blight of rice ( Cochlioborus m iyayabeanus
), Rice blast ( Pyriculari a oryzae ), wheat bare smut ( Ustilago n uda ), wheat linseed smut ( Tilletia c arie s, Tilleti a foetida ), wheat smut ( Ustilago h ordei ), Spot disease of wheat ( Cochliobor
us s ativus ), potato black leg disease ( Rhizoctoni a sola
ni ), and can be effective in controlling rice garlic nematodes.

[0010]

EXAMPLES The present invention will be described more specifically below with reference to examples, comparative examples and test examples. In the following examples, parts represent parts by weight. Example 1 20 parts of the above-mentioned pesticide active ingredient compound (1), solpol 50
3 parts of 60 (polyoxyethylene alkylaryl ether sulfate made by Toho Kagaku), 2 parts of Solpol 5073 (aromatic sulfonate made by Toho Kagaku) and 75 parts of zeolite were mixed with a mixer, and then finely ground by a centrifugal grinder. A wettable powder composition was obtained. 13.5 parts of the resulting wettable powder composition was diluted with water to obtain a polyoxyethylene montanic acid ester concentrate (20% of polyoxyethylene montanic acid ester).
% Water dispersion) was added to 0.1, 0.5 or 1 part, and further water was added to make 100 parts to obtain a wettable powder diluent.

Example 2 2 parts of the above-mentioned pesticide active ingredient compound (2), Solpol 5060
(Toho Kagaku polyoxyethylene alkylaryl ether sulfate) 3 parts, Solpol 5073 (Toho Kagaku aromatic sulfonate) 2 parts and kaolin clay 93 parts were mixed with a mixer, and then finely pulverized by a centrifugal pulverizer. A wettable powder composition was obtained. 13.5 parts of the obtained wettable powder composition was diluted with water to obtain a polyoxyethylene montanic acid ester concentrate (2% of polyoxyethylene montanic acid ester).
0.5 parts of 0% dispersion in water) was added, and water was further added to make 100 parts to obtain a wettable powder diluent. Example 3 50 parts of the above-mentioned pesticidal active ingredient compound (6), Solpol 50
60 parts (Polyoxyethylene alkyl aryl ether sulfate made by Toho Chemical), calcium lignin sulfonate 2
Parts and 45 parts of diatomaceous earth were mixed with a mixer, and then finely pulverized with a centrifugal pulverizer to obtain a wettable powder composition. 13.5 parts of the obtained wettable powder composition was diluted with water, and 0.5 parts of polyoxyethylene montanic acid ester concentrate (dispersion of 20% polyoxyethylene montanic acid ester in water) was added, Further, water was added to make 100 parts to obtain a wettable powder diluent.

Comparative Example 1 A wettable powder diluent was obtained in the same manner as in Example 1, except that the polyoxyethylene montanic acid ester concentrate was not added. Comparative Example 2 A wettable powder diluent was obtained in the same manner as in Example 2 except that the polyoxyethylene montanic acid ester concentrate was not added. Comparative Example 3 A wettable powder diluent was obtained in the same manner as in Example 3, except that the polyoxyethylene montanic acid ester concentrate was not added.

Test Example 1 Each of the wettable powder diluents obtained in Example 1 and Comparative Example 1
00 ml was placed in a cylinder with a 100 ml stopper, stirred by inversion to make a uniform liquid, and left at room temperature for 24 hours. After leaving
The inversion was repeated to redisperse the bottom sediment layer, and the number of cylinder inversions required to completely redisperse the sediment layer was counted. The results are shown in Table 1.

[Table 1]

Test Example 2 One each of the wettable powder diluents obtained in Example 2 and Comparative Example 2
00 ml was placed in a cylinder with a 100 ml stopper, stirred by inversion to make a uniform liquid, and left at room temperature for 24 hours. After leaving
The inversion was repeated to redisperse the bottom sediment layer, and the number of cylinder inversions required to completely redisperse the sediment layer was counted. The results are shown in Table 2.

[Table 2]

Test Example 3 1 each of the wettable powder diluents obtained in Example 3 and Comparative Example 3
00 ml was placed in a cylinder with a 100 ml stopper, stirred by inversion to make a uniform liquid, and left at room temperature for 24 hours. After leaving
The inversion was repeated to redisperse the bottom sediment layer, and the number of cylinder inversions required to completely redisperse the sediment layer was counted. The results are shown in Table 3.

[Table 3]

[0016]

EFFECTS OF THE INVENTION According to the method for preparing a diluting solution for wettable powder according to the present invention, a diluting solution having excellent redispersibility can be obtained in the preparation of a chemical solution with a low dilution ratio as used in seed treatment It is extremely advantageous.

Claims (3)

[Claims] 1. A method for preparing a seed treatment wettable powder diluent, which comprises adding a higher fatty acid ester of polyoxyalkylene when diluting a wettable powder for seed treatment containing an agrochemical active ingredient with water. 2. An additive for a diluting liquid for seed treatment, which comprises a higher fatty acid ester of polyoxyalkylene when the wettable powder for seed treatment containing an agrochemical active ingredient is diluted with water. 3. A wettable powder diluent for seed treatment, comprising an agrochemical active ingredient and a higher fatty acid ester of polyoxyalkylene.