JPH08333203A - Stable aqueous suspension pesticide formulation - Google Patents

Abstract

(57) [Summary] [Structure] An aqueous suspension pesticide formulation containing at least one pesticidal active ingredient that is solid at room temperature and sparingly water-soluble or water-insoluble is characterized by using sepiolite as a physical stabilizer. Stable aqueous suspension pesticide formulation. [Effect] A pesticide composition in suspension in water, which suppresses sedimentation of a finely divided pesticide active ingredient during storage, has hard water resistance against hard water, and is stable even when mixed with a Bordeaux solution.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to the use of sepiolite as an aqueous suspension agricultural chemical formulation as a physical stabilizer and the use of the sepiolite as a solid at room temperature and a sparingly water-soluble or water-insoluble agricultural chemical active ingredient. The present invention relates to a stable pesticide formulation in the form of an aqueous suspension, and more specifically, it suppresses sedimentation of the pesticide active ingredient during storage with sepiolite, has hard water resistance against hard water, and has a Bordeaux solution. It is intended to provide a pesticide composition in suspension in water that is stable even when mixed.

[0002]

2. Description of the Related Art In general, when a pesticide active ingredient is solid, an aqueous suspension pesticide formulation is made into fine particles, and the active ingredient is dispersed and suspended by mixing a surfactant and an auxiliary agent with water as a dispersion medium. It is a compounded formulation. Aqueous suspension pesticide formulations have water as a dispersion medium and do not need to use a large amount of an organic solvent like an emulsion, so that toxicity and irritation to sprayers and animals due to the organic solvent, a problem of odor, or There is no problem of flammability, and even pesticide active ingredients that are sparingly soluble in water or organic solvents can be formulated in liquid form, and because it is liquid, it is easier to measure than wettable powders, etc. and diluted with water. It has many excellent features such as no dusting.

It is important for an agricultural chemical preparation in the form of an aqueous suspension to reduce sedimentation and separation of the active ingredient of the agricultural chemical during storage, prevent gelation of the preparation, hard caking, etc., and stabilize the preparation for a long time. Generally, in an aqueous pesticide formulation in the form of an aqueous suspension, various auxiliary agents are added in addition to the surfactant in order to prevent sedimentation and separation of the pesticide active ingredient during storage. As an auxiliary agent, a smectite clay mineral such as a natural product or a synthetic product, or a water-soluble organic polymer compound of a natural product, a synthetic product or a semi-synthetic product is used.

[0004]

The swelling property of smectite clay minerals varies depending on the hardness of water, and the stability of the composition tends to be inferior when water with a particularly high hardness is used.
There is a problem that it is not uniformly dispersed in the aqueous solution due to the influence of diluting water. Since the water-soluble polymer is a natural organic substance, it decomposes during long-term storage and gives off an offensive odor. Therefore, it is necessary to add an antiseptic agent such as formalin to prevent spoilage. or,
When controlling pests, for the purpose of labor saving, in order to simultaneously control other pests that occur at the same time and at the same time,
It is often used by mixing with other agricultural chemicals just before use. However, when it is mixed with an aqueous suspension pesticide formulation using water-soluble polymer, synthetic smectite, and some smectite clay minerals (such as montmorillonite group), it becomes a gel when mixed with Bordeaux liquid, which is often used in fruit and gardening. ,
There are problems such as not being evenly dispersed.

[0005]

Means for Solving the Problems The inventors of the present invention have conducted extensive studies to solve the above problems, and as a result, by using sepiolite as a physical stabilizer in a suspension composition,
A pesticide active ingredient that is solid at room temperature and sparingly soluble or insoluble in water can be uniformly and stably suspended in water, is not affected by the hardness of water, is easy to handle, has storage stability, and is suitable for spraying. It has been found that the dispersibility and suspension properties of the above are excellent, and that it does not gel even when mixed with a Bordeaux solution, and has completed the present invention. That is, the pesticidal formulation in the form of an aqueous suspension of the present invention contains at least one pesticidal active ingredient that is solid at room temperature and hardly soluble or insoluble in water, sepiolite and water as a thickening agent, and if necessary, a surface active agent. It is an aqueous pesticide formulation containing an agent, other auxiliary agents, etc., which has hard water resistance against hard water and is stable even when mixed with Bordeaux solution.

Sepiolite in the present invention is a natural hydrous magnesium silicate and belongs to clay minerals. The chemical formula is (Si ₁₂ ) (Mg ₈ ) O ₃₀ (OH ₂ ) ・ 8H ₂ OZ = 2 (Si ₁₂ ) (Mg ₉ ) O ₃₀ (OH) ₆ (OH ₂ ) ₄・ 6H ₂ OZ = 2 Although the ideal formula of No. 1 has been reported (Clay Handbook, page 82, published by Gihodo), the chemical analysis values show some changes. In particular, there are species with a high Mg content, sepiolite containing a small amount of Ca, Cu, NH ₄ and sepiolite in which a part of Mg is replaced with Al, Fe ³⁺ , Fe ²⁺ , Mg, etc. Have various particle sizes and products coated with organic molecules on the particle surface, and may be selected and used according to the purpose. For example, Pangel B [Pangel B, manufactured by TOLSA (Spain)],
Pangel S-9 [Pangel S-9, manufactured by TOLSA (Spain)] and the like can be exemplified, and Pangel B in which the surface of particles is coated with an organic molecule is preferable. The sepiolite of the present invention can be used alone or as a mixture with the above sepiolite, and is generally used in an amount of 0.1 to 10 per 100 parts by weight of the pesticide formulation in an aqueous suspension.
It may be used in parts by weight, preferably 0.1 to 10 parts by weight.

The sepiolite used as the physical property-improving agent of the present invention is a water-soluble polymeric auxiliary agent of other synthetic or semi-synthetic products such as xanthan gum, xanthan gum, gum arabic, sodium carboxymethyl cellulose,
It may be used as a mixture with hydroxyethyl cellulose, methyl cellulose, polyvinyl alcohol and the like, and the mixing ratio can be arbitrarily selected and used, but when mixed, the ratio in 100 parts by weight of the aqueous pesticidal formulation is as follows. 0.
It may be selected in the range of 1 to 20 parts by weight.

Examples of the pesticidal active ingredient which is solid at room temperature and hardly soluble or insoluble in water according to the present invention include the pesticidal active ingredients shown below, but the present invention is not limited thereto. MIPC, Isoprocarb, BPMC, Fenobuca
rb), MPMC, xylylcarb, XM
C, NAC, Carbaryl, Bendiocarb, Carbofuran, Cypermethrin, Fenpropatorin (Fe
npropathrin), Ethofenprox
), Resmethrin, EPN, Cyanofenphos, PAP, phenthoate, CVMP, tetrachlorbinphos (Te)
trachlorvinphos), Monocrotophos
), Phosalone, Chlorpyrifos-methyl, Chlorpyrifos (Chlorpyr)
ifos), Pyridaphenthion, Quinalphos, DMTP, Methidathione
thidathion), salicion (Dioxabenzofos), penzoepin (Endosulfan),

Bensultap, Buprofezin, Flufenoxuron
pesticide compounds such as uron), diflubenzuron, chlorfluazuron, imidacloprid, triflumizole, triforine, mepronil, flutolanil, flutolanil, Pencycuron), Oxycarboxin (Oxycar
boxin), Iprodione (Iprodione), Pinclozoline (Vinclozoline), Procymidone (Procymidone),
Benomyl, Captan, Fthalide, TPN, Chlorothalonil (Chloroth)
alonil), Zineb (Zineb), Manneb (Maneb), Diclomedine (Diclomezin), Tricyclazole (Tricyc)
lazole), Isoprothiolane (Isoprothiolane), Probenazole (Probenazole), Anilazine (Anilazine)
),

Bactericidal compounds such as Oxolinic acid and Ferimzone, Imazosulfuron, Bensulfuron-methyl, Simetrin, Dimethametryn, Dimethametryn, Dymro
n), Propanil, Mefenacet
acet), Swep, Oxadiaz
on), pyrazolate (Pyrazolate), trifluralin (Trifluralin), and dithiopyr (Dithiopyr). The surfactant used in the composition of the present invention is not particularly limited, and various anionic surfactants, nonionic surfactants and the like which have been conventionally used in the field of agrochemical formulation can be used.

As the anionic surfactant, sulfonic acid type surfactants and salts thereof, sulfate type surfactants and salts thereof, phosphate type surfactants and salts thereof, higher fatty acid salts, polycarboxylic acid type Examples thereof include surfactants and salts thereof. The salts of each of the above surfactants include salts of sodium, potassium, calcium, magnesium, ammonium, ethanolamine, diethanolamine, triethanolamine, various amines and the like. Examples of the nonionic surfactant include polyoxyethylene styryl phenyl ether, polyoxyethylene alkyl allyl ether, polyoxyethylene alkyl ether and the like. These surfactants can be used alone or in combination of two or more.

In the composition of the present invention, an antifreezing agent in the cold season can be used if necessary. Examples of the antifreezing agent include ethylene glycol, propylene glycol, glycerin, alcohols such as methanol, water-soluble urea and the like. Organic compounds, inorganic or organic salts such as sodium chloride, ammonium chloride, sodium acetate, etc. can be added, and defoaming agents such as silicone emulsion, preservatives, etc. can be used as necessary as other components. . The aqueous pesticidal formulation of the present invention is used for controlling various pests, weeds, etc. by, for example, water surface application, foliage treatment, etc., but the present invention is not limited to these methods of use.

[0013]

EXAMPLES Representative examples of the present invention will be shown below, but the present invention is not limited thereto. In the examples, “parts” means “parts by weight”. Example 1. Buprofezin 5.50 parts Sorpol 3105 4.00 parts Sepiolite 5.00 parts Propylene glycol 10.00 parts Silicon KM-73 0.25 parts Water (hard water) 75.25 parts ──────────── ────────────────── 100.00 parts

The above composition was prepared as follows. To 30.25 parts of water, 4.00 parts of Solpol 3105 (a mixture of nonionic and anionic surfactants, manufactured by Toho Chemical Industry Co., Ltd.) and 0.25 part of Silicon KM-73 (Shin-Etsu Chemical Co., Ltd.) Manufactured) and propylene glycol 1
0.00 part was added, and a regular stirrer (Homomixer HV-
M, manufactured by Tokushu Kika Kogyo Co., Ltd., was dissolved and mixed for 10 minutes, then 5.50 parts of buprofezin was added, and finely pulverized by a wet pulverizer (Dyno Mill KLD type, manufactured by WBA Pakofen). Add 10 more water to this one beforehand.
50.00 parts of a sepiolite 10% dispersion liquid in which 10 parts of sepiolite (Pangel B) were dispersed was added to 0 part, and
The resulting mixture was uniformly mixed for 100 minutes to obtain 100 parts of the preparation.

Examples 2 to 6 and Comparative Examples 1 to 9 According to Tables 1 and 2, 100 parts of each preparation was obtained in the same manner as in Example 1.

[Table 1]

[0016]

[Table 2]

[0017]

[Table 3]

[0018]

[Table 4] Note: Wanger B is a smectite type mineral (manufactured by RT Vantelbilt) Kunipia G is a montmorillonite type mineral (manufactured by Kunimine Chemical Co., Ltd.)

Test Example 1. Physical static stability 20 ml of the composition of the present invention and the composition of the comparative example were placed in a graduated cylinder with an internal diameter of 1.3 cm and a volume of 20 ml, and the mixture was allowed to stand at 25 ° C. for 3 months, and then the volume of the sedimentation layer was V ml. Was measured and the ratio to the total volume of 20 ml was calculated by the following formula, and this value was defined as the physical static stability.

[Equation 1] Therefore, a stability of 100 indicates no separation. The results are shown in Table 3.

[0020]

[Table 5]

Test Example 2. Mixing test with Bordeaux solution: 250 mL of Bordeaux solution was placed in a measuring cylinder with an internal stopper of 38.9 mm and a volume of 250 mL, and 1 mL of the composition of the present invention or the composition of Comparative Example was further added thereto. The cylinder is tilted 10 times at a speed of 1 turn for 2 seconds, and the dispersion state of the charged composition is observed. Then, the liquid in the cylinder was passed through a sieve having a mesh size of 0.104 mm, and the presence or absence of a residue on the sieve was examined and judged according to the following criteria. Criteria (1) Uniform dispersibility ○: Uniform dispersion ×: Not dispersed (2) Residue −: None +: Yes The results are shown in Table 4.

[0022]

[Table 6]

Claims (2)

[Claims] 1. A pesticide formulation in the form of an aqueous suspension, characterized by using sepiolite as a physical stabilizer. 2. A pesticide formulation in the form of an aqueous suspension, which is solid at room temperature and contains at least one pesticidal active ingredient that is sparingly soluble in water or insoluble in water, characterized by using sepiolite as a physical stabilizer. Aqueous suspension pesticide formulation.