JP3180360B2 - Method for producing granular pesticide composition - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a granular agricultural chemical composition containing a physiologically active agricultural substance and disintegrating in water.

[0002]

BACKGROUND OF THE INVENTION Agrochemical compositions as agricultural sprays are generally sold in the form of wettable powders, emulsions, suspensions and the like. Wettable powders are usually physiologically active agricultural substances, surfactants,
It is composed of a powder obtained by finely pulverizing an inert solid or the like. This dosage form is inexpensive, but it may have a bad effect on the human body from suction and sticking to the skin due to dusting at the time of opening and weighing. It had disadvantages such as difficulty. The emulsion is composed of an agricultural physiologically active substance, a surfactant, an organic solvent and the like. The product may contain a fire or explosion hazard due to the presence of organic solvents, may cause harm to the human body.In addition, when disposing of containers, even if the bottle is washed, it may not be disposed of as general waste. Also, there were disposal problems, such as incineration of plastic bottles. Suspensions, which are referred to as improved formulations of wettable powders, also have problems in that their contents tend to remain in the container due to their high viscosity, and also in the disposal of the container as in the case of emulsions. In recent years, water dispersible granules having advantages in operation such as no powdering and easy measurement have been developed and are now available on the market. Various methods such as extrusion granulation, tumbling granulation, stirring granulation, and spray drier are known as methods for producing this agent, but all of these methods use water to granulate. Therefore, a drying step is required and the production cost increases, and the solubility in water is 100 pp.
m or more have a drawback such as the possibility of particle growth during the drying process, and depending on the production method, imparts good physical properties such as disintegration in water, which are important for this agent. Some are difficult.

[0003]

SUMMARY OF THE INVENTION The present invention provides an inexpensive granular pesticidal composition having good disintegration in water.

[0004]

Means for Solving the Problems The present inventors have made intensive studies to solve these problems, and found that by using a certain kind of water-soluble conjugate, it is excellent in disintegration in water and very inexpensive. The present invention was completed by finding a method that can be manufactured. That is, the present invention is a granular pesticidal composition comprising an agricultural physiologically active substance, a carrier, a surfactant, and a water-soluble binder having a melting point of 40 ° C. or higher. In the present invention, the agricultural physiologically active substance is preferably a solid substance at normal temperature, but some liquid substances can be used by adsorbing them on white carbon or the like and pulverizing them. These include fungicides, insecticides, acaricides, herbicides, plant growth regulators, etc.
Specifically, thiophanate methyl, triflumizole,
Triazine, captan, thiuram, vinclozolin,
Josetyl aluminum, Maneb, Tralomethrin, CPCB
S, hexithiaox, sethoxydim, and the like.

Examples of the water-soluble binder having a melting point of 40 ° C. or higher, preferably 50 ° C. or higher include polyethylene glycol, polyoxyethylene alkyl ether, polyoxyethylene alkyl aryl ether, polyoxyethylene polyoxyalkylene block copolymer, polyoxyethylene. Examples thereof include an alkyl ester and a polyoxyethylene alkylamide. Incidentally, polyethylene glycol preferably has a molecular weight of 3,000 or more and 20,000 or less. Some of these also act as surfactants. Surfactants include the usual alkylbenzene sulfonates, dialkyl sulfosuccinates, alkyl sulfonates, lignin sulfonates, alkyl naphthalene sulfonates, formalin condensates of naphthalene sulfonates, alkyl naphthalene sulfonates Anionics such as formalin condensates, alkyl methyl taurides, polycarboxylates, polyoxyethylene alkyl ethers, polyoxyethylene alkyl aryl ethers, polyoxyethylene polyoxyalkylene block copolymers, polyoxyethylene alkyl esters, polyoxyethylene Nonionic systems such as alkylamides and alkylacetylene glycols can be used.

As a carrier, mineral powders such as clay, talc, bentonite, and diatomaceous earth having an appropriate particle size, organic powders such as lactose, dextrin, starch, cellulose, and urea, sodium sulfate, calcium sulfate, magnesium sulfate, ammonium sulfate, Salts such as sodium chloride, sodium nitrate, calcium carbonate, sodium carbonate, potassium carbonate, sodium tripolyphosphate, sodium pyrophosphate and sodium benzoate can be used. Other additives may include synergists, colorants, fixing agents, antioxidants, pH adjusters, ultraviolet absorbers, disintegration aids, carbon dioxide generators, and the like. This product can be manufactured by heating and mixing each component having a preferred particle size as a pesticide, cooling, and sieving with a suitable sieve, but adding this water-soluble binder to a commercially available wettable powder. In some cases, it can also be produced by heating and mixing, cooling, and sieving with an appropriate sieve.

[0007]

EXAMPLES Next, examples will be described, but the present invention is not limited to the following examples. Example 1 770 g of raw thiophanate methyl powder, sodium sulfate 2
42 g, sodium dioctyl sulfosuccinate 11
g, 33 g of sodium lignin sulfonate,
It was crushed by a jet crusher. The heated kneader is charged with 960 g of the pulverized material, mixed, and when the temperature of the mixture reaches about 90 ° C., a powdery polyethylene glycol 6000 (manufactured by Wako Pure Chemical Industries, molecular weight 750) is used as a water-soluble binder.
0, melting point 50-65 ° C) and sufficiently stirred.
Thereafter, the mixture was cooled to about room temperature with stirring, and discharged when granules were obtained. Sieve the waste 0.25 ~
The mixture was sieved with a 1.4 mm sieve to obtain 810 g of granules.

Example 2 770 g of raw thiophanate methyl powder, 242 g of clay,
After mixing 11 g of sodium dioctyl sulfosuccinate and 33 g of sodium lignin sulfonate, the mixture was pulverized by a jet pulverizer. 960 g of crushed material in a heated kneader
And when the temperature of the mixture reaches about 90 ° C., a powdery polyoxyethylene polyoxypropylene glycol (Epan-485, manufactured by Dai-ichi Kogyo Seiyaku Co., Ltd., melting point 53 ° C.) as a water-soluble binder. And stir well. Thereafter, the mixture was cooled to about room temperature with stirring, and discharged when a granulated product was obtained. Sieve opening waste
0.25 to 1.4 millimeter sieve, 790 g
Granules were obtained.

Example 3 110 g of raw Hexythiazox powder, 880 g of clay, 11 g of sodium dodecylbenzenesulfonate, and 44 g of a formalin condensate of sodium methylnaphthalene sulfonate were mixed and then pulverized by a jet pulverizer. The heated kneader is charged with 950 g of the pulverized material, mixed, and when the temperature of the mixture reaches about 90 ° C., a powdery polyethylene glycol stearyl ether (New Cargen D-1430, manufactured by Takemoto Yushi Co., Ltd.) as a water-soluble binder , Melting point 48
(° C) and stirred well. After that, the mixture was cooled with stirring to about room temperature, and discharged when granules were obtained.
410 g of granules were obtained.

Example 4 800 g of ground powder of fosetyl aluminum, sodium sulfate 15
0 g and 50 g of pulverized polyoxyethylene nonylphenyl ether (New Calgen D-440, manufactured by Takemoto Yushi Co., Ltd., melting point: 49 ° C.) as a water-soluble binder were charged into a kneader, and the temperature of the mixture was adjusted to about 90 ° C. while mixing. And stir enough. Then cool while stirring to room temperature,
When the granules were obtained, they were discharged. Granulate the effluent with a sieve with a sieve opening of 0.25 to 1.4 mm,
g of granules were obtained.

Example 5 White carbon 100 containing 30% of a tralomethrin drug substance
g, crushed diatomaceous earth 100 g, crushed bentonite 300 g,
A kneader is charged with 440 g of ground clay and 60 g of polyethylene glycol-4000 (made by Wako Pure Chemical Industries, molecular weight 3000, melting point 50-60 ° C.) as a water-soluble binder, and heated while mixing. The temperature of the mixture is adjusted to about 90 ° C. and the mixture is sufficiently stirred. Thereafter, the mixture was cooled with stirring to about room temperature, and discharged when a granulated product was obtained. The discharged material was sized with a sieve having a sieve opening of 0.25 to 1.4 mm to obtain 250 g of granules.

Examples 6 to 10 Commercially available Topgin M wettable powder (Example-6), Nissolan wettable powder (Example-7), Ariette wettable powder (Example-
8), 960 g of each of Osadan wettable powder (Example-9) and Robral wettable powder (Example-10) were charged into a kneader, and the mixture was mixed with water until the temperature of the mixture reached about 90 ° C. Powdered polyethylene glycol 6 as an agent
000 (manufactured by Wako Pure Chemical Industries, molecular weight 7500, melting point 50-
(65 ° C.) and stirred well. Thereafter, the mixture was cooled with stirring to about room temperature, and discharged when a granulated product was obtained. The effluent is sieved with a sieve with a sieve opening of 0.25 to 1.4 millimeters, 370 g, 650 g, 7
20 g, 570 g and 530 g of granules were obtained.

Test Examples Examples 1 to 10 and commercially available Topgin M as a comparative example
Wettable powder, Nissolan wettable powder, Ariette wettable powder, Osadan wettable powder, Robral wettable powder were added to 100 ml of test water in 100 ml of tap water, and 100 mg was added to the mixture.
The flask was inverted once to prepare a 1000-fold diluted solution. The amount of the precipitate (ml) after standing for 30 minutes was measured and used as an index of suspension stability. The results are shown in Tables 1 and 2.

[0014]

[Table 1]

[0015]

[Table 2]

[0016]

According to the present invention, it is possible to obtain a granular pesticidal composition which can be produced more simply and inexpensively than conventional ones.

Continuation of the front page (56) References JP-A-3-173802 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) A01N 25/14

Claims (1)

(57) [Claims] (1) a physiologically active substance for agriculture, (a) a surfactant, (c) a carrier and (d) a water-soluble binder having a melting point of 40 ° C. or more, polyethylene glycol or poly (ethylene glycol having a molecular weight of 3,000 to 20,000) A substance selected from oxyethylene alkyl ether, polyoxyethylene alkyl aryl ether, polyoxyethylene polyoxyalkylene block copolymer, polyoxyethylene alkyl ester, and polyoxyethylene alkyl amide is heated and mixed without adding water, and after cooling, it is adjusted. A method for producing a granular pesticidal composition, characterized by granulating.