JP2969475B2 - Stable hydrated granular pesticide - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION 1) Object of the Invention (1) Field of Industrial Application The present invention relates to providing a technique for stabilizing a hydrated granular pesticide containing a fungicidal compound for agricultural and horticultural use as described below. .

(2) Prior art The following formula used as the pesticidally effective component in the present invention: (Hereinafter referred to as Compound A) are powdery mildew of "cucumber", rust of "wheat", black rot of "grape", red scab of "pear", black scab of "cucumber" It is known as a fungicide for scab (Japanese Patent Application Laid-Open No.
No. 65281).

On the other hand, hydrated granular pesticides have been studied as pesticide preparations which have little scattering of fine powder, have no problem in safety such as flammability and toxicity of organic solvents, and have excellent long-term storage properties.

For example, a granule prepared by mixing a water-soluble inorganic salt with a conventional wettable powder (Japanese Patent Publication No. 53-12577), a sugar, a naphthalenesulfonic acid-based surfactant and an alkali metal phosphate are compounded. And granules (JP-A-57-163303).

(2) Configuration of the Invention 1) Problems to be Solved by the Invention Compound A used in the present invention undergoes chemical degradation when formulated by the above-mentioned conventional techniques. Degradation of Compound A in the preparation not only reduces the biological effect, but also promotes phytotoxicity to the crop or causes significant deterioration in the physical properties of the preparation.

Therefore, in order to put the hydrated granular pesticide containing Compound A into practical use, it is necessary to stabilize Compound A during storage of the preparation.

 The present invention is to address such a need.

2) Means for Solving the Problems The present inventors have conducted intensive studies to solve the problems. As a result, a hydrated granular pesticide formulation was prepared from compound A, which is an active ingredient of pesticide, a surfactant, an inorganic basic substance, and a carrier. In particular, the pH of a 5-fold diluted solution of this formulation was 6 to 11 (20 to 20).
The present invention has been found that by adding an inorganic basic substance in an amount sufficient to obtain a compound A, the compound A is a chemically stable and biologically effective preparation which is not inferior to a wettable powder or an emulsion. Was completed.

3) Action The compound A of the present invention has an activity of controlling crop diseases and acts as an active ingredient of a pesticide, and the surfactant has a function of dispersing the compound A when the hydrated granular pesticide is diluted with water. It is. The basic substance controls the pH of the preparation, and the carrier is used to increase or decrease the content of Compound A in the preparation.

In the present invention, a formulation of compound A is prepared by adjusting the amount of the inorganic basic substance to be added so that the pH of the 5-fold water dilution water at 20 ° C. falls within the range of 6 to 11 in the present invention. The chemical decomposition during storage of water can be suppressed to obtain a stabilized hydrated granular pesticide.

Surfactants that can be used in the present invention include anionic surfactants, nonionic surfactants, cationic surfactants, amphoteric surfactants, and the like. It may be used in the range of 25 to 25% by weight, and preferably 5 to 20% by weight from the viewpoint of effect and economy.
The anionic surfactant referred to here includes, for example, lignin sulfonate, alkyl allyl sulfonate, alkyl sulfosuccinate, polyoxyethylene alkyl allyl phosphate, polyoxyethylene alkyl allyl ether sulfate, alkyl naphthalene sulfonate , Polyoxyethylene styryl phenyl ether sulfate and the like, and nonionic surfactants include, for example, polyoxyethylene alkyl allyl ether, polyoxyethylene styryl phenyl ether, polyoxyethylene alkyl ether, polyoxyethylene alkyl ester, polyoxyethylene Examples include ethylene sorbitan alkylate, polyoxyethylene styryl phenyl ether polymer, and polyoxyalkylene glycol. Examples of the cationic surfactant and the amphoteric surfactant include an alkylamine salt, a quaternary ammonium salt alkylbetaine, an amine oxide, and the like, but are not limited thereto, and these may be used alone or in combination of two or more. There is no problem if used together.

The inorganic basic substance of the present invention includes, for example, sodium hydroxide, potassium hydroxide, sodium carbonate, sodium bicarbonate, potassium carbonate, calcium carbonate, magnesium carbonate, white carbon, and the like. More than one kind may be used in combination. And the amount of this addition is the pH of the 5-fold diluted solution (20 ° C)
It is sufficient if the amount is 11 and generally 0.01 to 25% by weight
It may be used within the range.

The carrier of the present invention can be used as long as it is commonly used in agricultural chemical formulations. For example, clay, sericite,
Mineral substances such as kaolinite, ziglite, talc, calcium carbonate, magnesium carbonate, diatomaceous earth, silica, perlite, finely divided silica called white carbon, water-soluble inorganic salts such as sodium sulfate, ammonium sulfate, potassium chloride, glucose, Lactose, fructose, sugars such as sucrose, enzyme-modified dextrins, roasted dextrins, starches such as phosphatase-degraded starch, oxidized starch, pregelatinized starch, starch derivatives, urea, thiourea and the like, but are not limited thereto. Instead, one or two or more carriers may be used in combination.

Other auxiliary agents include, for example, antioxidants, photodegradation inhibitors, hydrolysis inhibitors, foam inhibitors, disintegration spreaders, oil absorbing agents, binders and the like. These adjuvants may be used alone or in combination of two or more.

Examples (Preparation method) No special method or device is required for preparing the hydrated granular pesticide of the present invention.

Examples of the granulation method include extrusion granulation, tumbling granulation, fluidized bed granulation, destructive granulation, spray granulation, and the like, and the particle size and shape of the granular pesticide are optional depending on the pesticide active ingredient and the dilution method. And it is not particularly limited.

Prior to use, compound A is dry-ground by a jet-omizer (Seishin Enterprise Co., Ltd.) or the like,
Dynomill (Willie Evacho Fen AG), Sand Glider (IMEX Co., Ltd.),
It is preferable to use wet pulverization with an attritor (manufactured by Mitsui Miike Seisakusho) or the like and finely pulverize it to an average particle diameter of about 0.1 to 5 μm.

Effects of the Invention When the hydrated granular pesticide of the present invention is implemented, the following effects are obtained. That is, first, compound A is stabilized in the preparation. Second, there is no problem with the crop disease control activity of compound A, which is an active ingredient of agricultural chemicals. Third, spraying on pesticides does not cause harm.
Fourth, unlike wettable powders, there is no graininess at the time of preparing a chemical solution, so that safety for workers can be ensured.

Next, examples of the present invention will be described, but the present invention is not limited to these examples. In addition, all the parts in an Example are shown by weight%.

Example 1 Compound A 10 parts POE nonylphenyl ether 2 parts Lignin sulfonic acid sodium salt 5 parts Sodium carbonate 0.4 part Silica 82.6 parts The above composition was pulverized and mixed, 14 parts of water was added, and the mixture was extruded and granulated. Granulated, dried and sieved to obtain a 10-48 mesh hydrated granular pesticide.

Example 2 Compound A 40 parts POE nonylphenyl ether 1 part β-naphthalenesulfonic acid formalin condensate 4 parts Calcium carbonate 5 parts Clay 50 parts The above composition was pulverized and mixed, and 12 parts of water was added. Granulate and dry sieve to obtain 10-48 mesh hydrated granular pesticide.

 Test examples will be given to prove the usefulness of the present invention.

Test Example 1 pH measurement test 80 ml of distilled water at 20 ° C. was placed in a 100 ml Erlenmeyer flask, 20 g of the preparation prepared according to the example was added, sealed, shaken for 1 minute, and allowed to stand for 5 minutes. PH without spending
The electrode of the meter (F8AT type, manufactured by Dari Seisakusho Co., Ltd.) was inserted, and the hydrogen ion concentration was measured.
The results obtained are shown in Table 1.

Test Example 2 Stability test of compound A 20 g of the preparation prepared according to the example was put into a 50 ml-capacity glass bottle with a stopper and stored in a thermostat at 40 ° C for 90 days and in a thermostat at 60 ° C for 30 days. The stored product was analyzed for the content of Compound A by liquid chromatography, and the residual ratio (%) with respect to the initial content value was determined.

 The results obtained are shown in Table 1.

Continuation of the front page (56) References JP-A-61-151102 (JP, A) JP-A-60-51102 (JP, A) JP-A-52-143224 (JP, A) JP-A-57-4907 (JP, A) , A) JP-A-63-72602 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) A01N 43/653 A01N 25/14 A01N 25/30 A01N 25/22

Claims (1)

(57) [Claims] 1. Structural formula A hydrated granular pesticide formulation is prepared from the compound represented by the formula, a surfactant, an inorganic basic substance, and a carrier, and the pH of a five-fold diluted solution of the formulation is sufficient to be 6 to 11 (20 ° C). A stable hydrated granular pesticide characterized by adding an inorganic basic substance.