JP2000128704A - Aqueous suspension-like agrochemical composition - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain an agrochemical composition which is an aqueous suspension-like agrochemical composition adjusted to the concentration directly used and gives a suspension by readily redispersing a precipitated layer formed on standing by means of right shaking. SOLUTION: This composition is an aqueous suspension-like agrochemical composition which is composed of at least one kind of agrochemical active ingredients that have an average particle diameter of 1 μm or smaller and are solid and water-insoluble or slightly water-soluble at ordinary temperature, a dispersant, a surfactant and water and previously adjusted to the concentration directly used. As the dispersant, at least one kind of purified clay mineral dispersants selected from attapulgite or montmorillonite are used and the precipitated layer formed in the lower part of the aqueous phase of the agrochemical composition on standing is readily redispersed by gentle shaking to make a suspension.

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 composition which can be used by simply shaking it without diluting it with water or the like at the time of application in home gardening, and relates to pests and diseases harmful to plants. Various pesticides to protect from, and also herbicides,
The present invention relates to a pesticidal composition, such as a plant growth regulator, which can be used widely for home gardening.

[0002]

2. Description of the Related Art In general, formulations of agricultural and horticultural pesticides include, for example, emulsions, wettable powders, granules, aerosols and the like.
It is sprayed after being diluted to a use concentration of about 0 to 2000 times. When performing pest control and weeding work on plants with such a pesticide composition, there are problems such as troublesome work of diluting a high concentration of the chemical to a working concentration, discomfort given to the worker at the time of dilution, bad smell, and dirty hands. . In order to solve these problems, various proposals have been made for an agricultural chemical composition which has been diluted with water in advance to a use concentration and can be applied as it is, that is, a so-called undiluted agricultural chemical composition (Japanese Patent Application Laid-Open Nos. 3-145403 and 6-145).
-305904, JP-A-8-268803, JP-A-10-87304).

[0003]

Generally, a pesticidal composition which has been diluted to a working concentration without being diluted with water is generally used by dissolving it in water if the pesticidal active ingredient is water-soluble. If it is a solid and water-insoluble or poorly water-soluble agrochemical active ingredient at room temperature, it is dissolved in an organic solvent,
It is used as a stable aqueous emulsion composition or aqueous microemulsion composition using a surfactant or the like. However, since the latter two dosage forms need to dissolve the pesticidal active ingredient in an organic solvent or the like, the pesticidal active ingredient that can be made into an aqueous emulsion composition or an aqueous microemulsion composition is limited,
In addition, there is a problem that some plants cause phytotoxicity due to the use of an organic solvent.

[0004] As an agrochemical composition which solves these problems, for example, when the agrochemical active ingredient is solid at room temperature and is water-insoluble or hardly water-soluble, an aqueous suspension in which the agrochemical active ingredient is finely divided and suspended in water. A pesticidal composition is desirable. However, simply diluting the high-concentration aqueous suspension pesticide composition to the working concentration, uniform storage due to sedimentation of the particulate solid pesticide active ingredient and poor redispersibility due to aggregation after sedimentation when stored for a long time. The spraying liquid state cannot be obtained, and the spraying nozzle becomes clogged and becomes unusable. Also, if the amount of the thickener is increased in order to prevent sedimentation, the viscosity increases and it cannot be sprayed, which makes practical use difficult. The object of the present invention is a pesticidal active ingredient which is difficult to dissolve in water or an organic solvent, a pesticidal active ingredient in which the residual effect or ingredient stability decreases when dissolved or a solid particle having a problem in safety such as enhancement of toxicity. It is an object of the present invention to provide a low-concentration undiluted aqueous suspension pesticide composition such as a pesticidal active ingredient which is desirably used in a form.

[0005]

Means for Solving the Problems The present inventors have made intensive studies to solve the above-mentioned problems, and as a result, have completed the present invention. The present invention relates to a pesticidal active ingredient 1 having an average particle size of 1 μm or less, which is solid at room temperature and insoluble or poorly soluble in water.
An aqueous suspension pesticide composition which has been adjusted to a direct use concentration comprising a seed or more and a dispersant, a surfactant, and water in advance,
As a dispersant, one or more refined clay mineral-based dispersants selected from attapulgite or montmorillonite are used, and a sedimentation layer formed at the lower portion of the aqueous phase of the pesticide composition upon standing is easily dispersed by light shaking. The present invention relates to an aqueous suspension pesticide composition which is redispersed to form a suspension.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION As the pesticidal active ingredient which is solid at normal temperature and is insoluble or poorly soluble in water used in the present invention, for example, 2-tert-butylimino-3-isopropyl-5
-Phenyl-3,4,5,6-tetrahydro-2H-
1,3,5-thiadiazin-4-one (generic name: buprofezin), tert-butyl = (E) -α- (1,3-dimethyl-5-phenoxypyrazol-4-ylmethyleneaminooxy) -p- Toluate (generic name: fenpyroximate), N-tert-butyl-N '-(4-ethylbenzoyl) -3,5-dimethylbenzohydrazide (generic name: tebufenozide), (±) -5-amino-1
-(2,6-dichloro-α, α, α-trifluoro-p
Insecticidal active ingredients such as -toluyl) -4-trifluoromethylsulfinylpyrazole-3-carbonitrile (generic name: fipronil), α, α, α-trifluoro-
3′-isopropoxy-o-toluanilide (general name: flutranyl), 2,3-dicyano-1,4-dithiananthraquinone (generic name: dithianone), tetrachloroisophthalonitrile (generic name: TPN) and the like Bactericidal active ingredient,
Methyl = α- (4,6-dimethoxypyrimidin-2-ylcarbamoylsulfamoyl) -o-toluate (generic name: bensulfuronmethyl), 2-chloro-N- (3
-Methoxy-2-thenyl) -2 ′, 6′-dimethylacetanilide (generic name: thenylchlor), ethyl = 2-
Chloro-5- (4-chloro-5-difluoromethoxy-
1-methyl-1H-pyrazol-3-yl) -4-fluorophenoxyacetate (generic name: pyraflufen-
Herbicidal active ingredients such as ethyl) can be exemplified, and the compounding ratio may be used in the range of 0.0001 to 0.1% by weight. These pesticidal active ingredients have an average particle size of 1 μm.
m and used, preferably 0.1 to 0.5 μm
m.

[0007] Further, since the aqueous suspension pesticide composition of the present invention is a low-concentration undiluted pesticide composition that can be directly sprayed without being diluted with water, water occupies most of the weight percent of the composition. A water-soluble pesticidal active ingredient may be blended according to the conditions. Examples of the water-soluble pesticidal active ingredient include (E) -N
¹ -[(6-chloro-3-pyridyl) methyl] -N ² -cyano-N ¹ -methylacetamidine (generic name: acetamiprid), O, S-dimethyl-N-acetylphosphoramidothioate (generic name) : Acephate), 2-p-chlorophenyl-2- (1H) -1,2,2,
4-triazol-1-ylmethyl) hexanenitrile (generic name: microbutanyl), 2-methoxy-N- (2
-Oxo-1,3-oxazolidin-3-yl) aceto-2 ', 6'-xylidide (generic name: oxadixyl)
Fungicidal active ingredients such as N- (phosphonomethyl glycinate (generic name: glyphosate) and its ammonium salt, sodium salt, isopropylamine salt or trimesium salt, DL-homoalanin-4-yl (methyl) phosphinate (generic name: (Glyphosinate) and herbicidal active ingredients such as ammonium salts thereof, and the mixing ratio thereof may be 0.0001 to 0.1% by weight.

The compounding ratio of at least one refined clay mineral dispersant selected from attapulgite or montmorillonite used as a dispersant in the present invention is 0.001 to 0.5.
What is necessary is just to select and use from the range of weight%. In addition, the aqueous suspension pesticide composition of the present invention comprises, as other components,
A surfactant, a freeze reconstituting agent, an antifoaming agent, a preservative, a thickener, and the like for the purpose of dispersion can be added. As the surfactant, for example, polyoxyalkylene alkyl ether, polyoxyalkylene alkyl phenyl ether,
Formalin condensate of polyoxyalkylene alkyl phenyl ether, polyoxyalkylene polystyryl phenyl ether, polyoxyalkylene alkyl ether sulfite, polyoxyalkylene polystyryl phenyl ether phosphate, dioctyl sulfosuccinate, alkylbenzene sulfonate, lignin sulfone Acid salts and the like can be exemplified, and these surfactants can be used alone or in combination of two or more.

Examples of the freeze reconstituting agent include, for example, ethylene glycol, propylene glycol, glycerin and the like, examples of the antifoaming agent include dimethylpolysiloxane and acetylene alcohol, and examples of the preservative include formalin and benzisothiazolone. be able to.
Further, if necessary, other components such as an organic solvent, a stabilizing agent, and a dye may be added. The aqueous suspension pesticide composition of the present invention is a pesticide active ingredient finely pulverized to 1 μm or less,
A dispersant, a surfactant, and a freeze reconstituting agent as a desired component,
It can be produced by mixing an antifoaming agent, a preservative, a thickener, and the like with water, and by a conventional method for agricultural chemical preparations. Hereinafter, examples, test examples, and the like of the present invention will be illustrated, but the present invention is not limited thereto.

[0010]

[Embodiment 1] Pyraflufen-ethyl 30.0
% By weight, polyoxyethylene alkylphenyl ether 0.70% by weight, polyoxyethylene polystyryl phenyl ether 1.00% by weight, propylene glycol 6.25% by weight, benzisothiazolone 0.15% by weight, dimethylpolysiloxane 0.50% Wt% and water 6
1.40% by weight of TK homomixer (manufactured by Tokushu Kika Kogyo)
And finely pulverized with a Dynomill KDL (manufactured by Shinmaru Enterprises) to an average particle size of 0.4 μm, and the resulting finely pulverized product containing finely divided pesticidally active ingredients of 0.17% by weight (effective for pesticides) Component: 0.05%) Attapulgite powder 5% aqueous solution 0.50% by weight (attapulgite 0.025%), propylene glycol 1
0.00 wt%, benzisothiazolone 0.10 wt%, dimethylpolysiloxane 0.01 wt% and water 8
By adding 9.22% by weight and mixing and homogenizing,
An aqueous suspension pesticide composition was obtained. When the obtained aqueous suspension pesticide composition is allowed to stand for a long period of time, a sediment containing a particulate pesticidal active ingredient and attapulgite is formed at the lower part of the composition. It is easily redispersed only by shaking, and becomes a uniform aqueous suspension pesticide composition. Since this uniform state is maintained for a relatively long time (several tens to several hours), sufficient time is required before spraying. There is room, and it is of course possible to spray properly, and no inconvenience occurs during spraying.

Examples 2 to 6 and Comparative Examples 1 to 12 Finely pulverized agricultural chemical active ingredients described in Tables 1 and 2 0.050% by weight Dispersants described in Tables 1 and 2 Tables 1 and 2 Weight% polyoxyethylene alkyl phenyl ether 0.0012 weight% polyoxyethylene polystyryl phenyl ether 0.0017 weight% propylene glycol 10.00 weight% benzisothiazolone 0.100 weight% dimethyl polysiloxane 0.010 weight% water balance Were uniformly mixed to obtain an aqueous suspension pesticide composition.

Test Example 1 Examples 1 to 6 and Comparative Examples 1 to 1
The aqueous suspension pesticide composition obtained in 2 was put in a 100 ml glass bottle and sealed. The dispersion state immediately after preparation was observed, and then the mixture was allowed to stand at room temperature for 6 months to obtain a dispersion state (dispersibility at rest). ) And then shake the container gently several times to investigate the redispersion state (redispersibility) and the dispersion stability after redispersion (dispersion stability). The applicability (sprayability) was investigated and judged according to the following criteria. The dispersion state immediately after the preparation was all uniform. (A) Dispersibility upon standing (dispersion state of active agricultural chemicals upon standing). A: The pesticidal active ingredient is uniformly dispersed. B: The pesticidal active ingredient settles down and forms a gentle sedimentation layer. C: The pesticidal active ingredient settles and aggregates at the bottom, forming a hard cake. (B) Redispersibility (after standing, lightly shaking several times). : Uniformly dispersed. Δ: Almost uniformly dispersed, but there are some aggregates. ×: Unusable due to large aggregation.

(C) Dispersion stability (time of uniform dispersion after redispersion). ：: A uniform dispersion state is maintained for 1 hour or more. Δ: Dispersed for 5 minutes to 1 hour. ×: Dispersed for 0 to 5 minutes (settles out after 5 minutes). -: Evaluation is not possible because re-dispersion is not performed. (D) Sprayability (whether or not it can be sprayed with a normal pesticide sprayer). : Can be sprayed ×: Can not be sprayed-: Cannot be evaluated because re-dispersion is not performed. Table 1 shows the results of Examples and Table 2 shows the results of Comparative Examples.

[0014]

[Table 1]

[0015]

[Table 2]

From the results of the examples of the present invention shown in Table 1, the active ingredients of agrochemicals of the present invention finely pulverized to 1 μm or less and suspended and at least one clay mineral selected from attapulgite or montmorillonite as a dispersant. The aqueous suspension pesticide composition to which the purified product dispersant is added, the dispersion state at the time of storage and standing is settled at the bottom to form a sedimented layer, but is redispersed by lightly shaking several times to form a uniform aqueous dispersion. It becomes a suspension-type pesticide composition, and since the redispersion state is maintained in a uniform state for a relatively long time, it is diluted to the use concentration with water in advance, and is an aqueous suspension-type pesticide composition that can be sprayed as it is. From the results of the comparative examples in Table 2, it can be seen that even when the pesticidal active ingredient is finely pulverized to 1 μm or less, the dispersant is hectorite (purified clay mineral-based dispersant) or xanthan gum (polysaccharide-based dispersant). Has no redispersibility at all. Even when tapargite or montmorillonite was used, the redispersibility was remarkably inferior when the average particle size of the pesticidal active ingredient was 1 μm or more.

Test Example 2. The aqueous suspension pesticidal composition obtained in Example 1 and Comparative Example 2 immediately after the preparation and the composition after standing at room temperature for 6 months were used as a fir tree (plant height 30 cm,
A potted herb was tested for herbicidal effect, and the effect was determined according to the following criteria. The composition left still at room temperature for 6 months was lightly shaken several times before spraying. The results are shown in Table 3.

[0018]

[Table 3] As is evident from the test results in Table 3, in Example 1 of the present invention, even when stored for a long period of time, it was redispersed with only a few shakings to form a uniform aqueous suspended pesticide composition. It is possible and has sufficient herbicidal effect. On the other hand, in Comparative Example 2, the composition immediately after the preparation has a sufficient effect,
Spraying became impossible with a composition that was stored for a long period of time.

[0019]

The aqueous pesticidal composition of the present invention is a clay mineral selected from attapulgite and montmorillonite by finely pulverizing a water-insoluble or poorly water-soluble pesticidal active ingredient which is solid at ordinary temperature and has an average particle diameter of 1 μm or less. By using a purified dispersant, the aqueous pesticide composition is excellent in redispersibility after standing for a long time and excellent in dispersion stability after redispersion.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Takashi Otsuka 74-1-602 O-suka, Tondabayashi-shi, Osaka F-term (reference) 4H011 AB01 AC01 BA01 BA05 BB09 BC07 BC10 BC19 BC20 DA15 DH03

Claims (2)

[Claims] (1) at least one kind of agrochemical active ingredient which is solid at normal temperature and water-insoluble or hardly water-soluble, having an average particle size of 1 μm or less;
An aqueous suspension pesticide composition which is previously adjusted to a direct use concentration comprising a dispersant, a surfactant, and water, and as a dispersant, one or more purified clay mineral-based dispersants selected from attapulgite or montmorillonite. Wherein the sedimentation layer formed under the aqueous phase of the pesticidal composition during standing is easily redispersed by light shaking to form a suspension. . 2. The mixing ratio of the dispersant is 0.001 to 0.5.
2. The aqueous suspension pesticide composition according to claim 1, which is contained in a weight percent.