JP2651702B2 - Agricultural and horticultural powder, wettable powder and method for stabilizing the same - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION INDUSTRIAL APPLICATION Agricultural and horticultural powder, characterized in that a compound represented by the formula (1) is used as an active ingredient, and one or more selected from vegetable oils and nonionic surfactants are blended in an amount of 0.2 to 5.0% with respect to the total amount. The present invention relates to a wetting agent and a method for stabilizing it.

[Conventional technology]

Usually, pesticides are formulated into various dosage forms in order to easily and efficiently spray the active ingredient and maximize the efficacy of the pesticide.

For example, in the paddy rice region of Japan and Asian countries, conventionally, powders and wettable powders containing an organic phosphorus agent, a carbamate agent and a pyrethroid agent have been generally used as paddy rice insecticides.

Dusts and wettable powders include an active ingredient and a solid inert carrier such as a mineral powder such as clays, talc, and diatomaceous earth, and further include an active ingredient stabilizer, a drift inhibitor, an emulsifier, a dispersant, and the like. A variety of new agricultural and horticultural powders and wettable powders have been developed with adjuvants, but the emergence of pesticides that are still fully satisfactory in terms of control effect, safety to humans, fish and shellfish, and prevention of environmental pollution. I have not seen it.

[Problems to be solved by the invention]

Pesticides, especially dusts, changes over time of the active ingredients contained in wettable powders, decrease the efficacy of pesticides, unexpected phytotoxicity by decomposition products, or cause problems during storage and storage, etc. How to prevent it is an issue that must always be considered regardless of the type of pesticide.

The compound represented by the formula (I) has already been known as a pyrethroid-like compound having both high insecticidal and acaricidal activity and low toxicity to humans and animals (Japanese Patent Application Laid-Open No. 61-87687). Since this compound has extremely low fish toxicity unlike conventional pyrethroid insecticides, its practical use has been studied especially as an insecticide for paddy rice, but mineral powders such as clay and talc are usually used as extenders. When formulated into powders and wettable powders, a phenomenon of decomposition over time was observed, and application of the powders and wettable powders to the field of paddy rice generally required various formulation improvements.

[Means and actions for solving the problems]

In view of this situation, the present inventors have conducted intensive studies to develop stable agricultural and horticultural powders and wettable powders. As a result, the compound represented by the formula (I), that is, dimethyl (4-ethoxyphenyl @ 3-) In preparing powders and wettable powders containing (3-phenoxy-4-fluorophenyl) propyl} silane [hereinafter referred to as compound A] as an active ingredient, one or two selected from vegetable oils and nonionic surfactants It has been found that the intended purpose of the present invention can be achieved by blending 0.2% to 5.0% of the seeds or more based on the total amount. Thus, the present invention has been completed.

Compound A does not have a functional group suggesting an unstable element in structure, and the decomposition mechanism when mixed with mineral powder and the stabilization mechanism of the vegetable oil or nonionic surfactant are still unknown. Although there are many points, it is considered that the behavior peculiar to the silicon atom is involved, and therefore, stabilization of the above-mentioned compound is completely inconceivable from conventional knowledge.

Representative examples of the vegetable oil and the nonionic surfactant incorporated in the present invention are as follows, but are not limited thereto.

Vegetable oil Linseed oil, castor oil, rapeseed oil, rubber oil, etc.

An epoxidized vegetable oil obtained by epoxidizing the unsaturated portion of a vegetable oil containing an unsaturated fatty acid glyceride as a main component has a better stabilizing effect than the original vegetable oil and is therefore suitable.

Nonionic surfactants 1. Fatty acid esters of sorbitan ... Span surfactants 2. Polyoxyethylene ether of sorbitan ester…
Twin surfactant 3. polyoxyethylene ethers of alkyl amine _{R-NH- (CH 2 CH 2} O) n-H 4. Polyoxyethylene ether alkylphenols 5. Alkylol amide of fatty acid 6. polyoxyethylene ethers of fatty acids _{R-COO- (CH 2 CH 2} O) alkylamine n-H 7. fatty amide _{R-CONH (CH 2 CH 2} NH) n-H 8. higher alcohol polyoxyethylene Ether R—O— (CH ₂ CH ₂ O) n—H 9. Polyoxyethylene ether of castor oil, etc. In the above formula, R represents an alkyl group. n represents an integer of 1 or more, and na, nb, and nc each represent 0 or an integer of 1 or more, where na + nb + nc ≧ 1.

In the usual production, it is often obtained as a mixture of compounds having various degrees of polymerization, but it is preferred that the compound is included in the present invention irrespective of a single product or a mixture and exhibits a liquid state at normal temperature.

The composition of the present invention comprises Compound A as an active ingredient in a weight ratio.
0.1 to 20%, and 0.2 to 5.0%, preferably 0.5 to 2.0%, of the total amount of one or two selected from the above-mentioned vegetable oils and nonionic surfactants as a stabilizer. The agent also has a function as a flocculant, and in the case of dust, contributes to the prevention of drift.

Mineral powders used in the agricultural and horticultural powders and wettable powders of the present invention include clay, talc, kaolin, bentonite,
Zeolite, diatomaceous earth, zeeklite, carplex, etc. can be mentioned. For agricultural and horticultural powders, from the viewpoint of suppressing drift at the time of spraying and preventing environmental pollution, fine powder with a particle size distribution of 10 microns or less % Or less, such as driftless clay (DL clay), is particularly useful.

In addition, since compound A is generally more stable in the neutral and weakly alkaline regions than in the acidic region, basic inorganic carriers such as calcium carbonate, calcium oxide, calcium sulfate, magnesium sulfate and calcium hydroxide are used for the purpose of pH adjustment. It is preferably blended, and if necessary, various emulsifiers, dispersants, fluidity improvers such as PAP (Nippon Kagaku, trade name) and a small amount of co-solvent are used for the purpose of uniform mixing.

Compound A is used as an active ingredient in the agricultural and horticultural powders and wettable powders of the present invention in addition to other insecticides such as organic phosphorus agents such as fenitrothion, diazinon, and propaphos, NAC, MTMC, and BPM.
Carbamates such as C and PHC, conventional pyrethroid insecticides such as pyrethrin, allethrin, phthalthrine, framethrin, phenothrin, velmethrin, fenvalerate, fluvalinate, etofenprox,
Excellent effect by mixing insecticides such as cartap, chlorphenamidine, buprofezin, or acaricides, fungicides, pesticides, herbicides, insect growth disrupters, plant growth regulators, fertilizers, and other pesticides. A multi-purpose composition can be obtained, and labor saving and synergistic effect between drugs can be expected.

If necessary, an antioxidant such as BHT, Sumilizer BP-101 (Sumitomo Chemical, trade name) or the like may be added to Compound A.
Can be further enhanced in stability.

The agricultural and horticultural powders and wettable powders of the present invention include sanitary pests such as flies, mosquitoes and cockroaches, as well as organophosphates, carbamate-resistant leafhoppers, planthoppers,
It is extremely useful for controlling agricultural and horticultural pests such as rice water weevil and rice weevil, stink bugs, armyworms, aphids, aphids, beetles, scale insects and chahamaki, and is particularly in great demand in the field of paddy rice where low fish toxicity is required. .

〔Example〕

Next, the present invention will be described in more detail with reference to Test Examples and Examples, but it goes without saying that the present invention is not limited to these.

Test Example 1 Each 0.5% powder of Compound A was prepared according to the formulation shown in the following table, and this powder was placed in a glass bottle and stored in a constant temperature room at 40 ° C. Two weeks later, the amount of the active ingredient in the powder was analyzed by gas chromatography, and the recovery with respect to the initial content was determined as follows. The formulation physical properties of the prepared powder (floating,
(Fluidity etc.).

As a result of the test, by adding a vegetable oil and a nonionic surfactant to Compound A to prepare a powder, a powder having excellent stability could be obtained. On the other hand, in the case of a powder containing no stabilizer (control powder 1), the active ingredient is rapidly decomposed,
In the case of the anionic surfactant (control powder 2), a sufficient stabilizing effect of the active ingredient was not obtained. In the case of the control powder 3, since the amount of the nonionic surfactant is too large, there is a problem in the physical properties of the preparation in terms of fluidity and emolliability. Therefore, it is necessary to determine the amount to be mixed from both the stabilizing effect and the physical properties of the preparation. It became clear that there was.

Test Example 2 According to Test Example 1, the powders shown in the following table were prepared by changing the type of the mineral substance powder, and the stability after 2 weeks of storage in a constant temperature room at 40 ° C. was examined as follows.

As a result of the test, stabilization of Compound A was achieved by blending vegetable oil and a nonionic surfactant regardless of the type of the mineral powder used.

Example 1 0.5 part of Compound A, a stabilizer, 0.05 parts of Sumilizer BP-101 (Sumitomo Chemical, trade name) were dissolved in 1.0 part of Nisseki Hisol SAS (trade name, Nippon Oil Co., Ltd.), and this was dissolved in calcium carbonate 10
Part and the powder adsorbed on 1.0 part of carplex, 0.5 part of span 85 (Atlas, trade name) and 86.95 parts of DL clay are mixed well, and then mixed and ground with a hammer mill to obtain 00.5%
Dust DL was obtained.

This powder had excellent long-term storage stability and no decomposition was observed even after storage for one year. In addition, when this drug was sprayed on a paddy rice field in which organic phosphorus-resistant leafhoppers and planthoppers occurred, it showed an excellent control effect, and there was no problem of phytotoxicity or fish toxicity.

Example 2 Compound A 0.5 part, diazinon 0.5 part, epoxidized sesame oil 0.5 part, Solpol SA-5 (Toho Chemical Co., trade name) 1.5
, 1.0 part of carplex and 96 parts of kaolin obtained by cutting fine powder of 10 μm or less were mixed well and then mixed and pulverized with a hammer mill to obtain a 0.5% compound A powder. This dust was excellent in long-term storage stability and formulation physical properties, and exhibited a high control effect on various agricultural and horticultural pests.

Example 3 Compound A 20 parts, Epoxidized sesame oil 3 parts, Solpol 249
5 (Toho Kagaku, trade name) 2 parts, Sun Extract P-201 (Sanyo Kokusaku pulp, trade name) 2 parts, 15 parts of white carbon and 58 parts of kaolin clay are uniformly mixed in a mixer, and the active ingredient is 20% wettable powder was obtained.

This wettable powder was excellent in long-term storage stability, and when diluted to 2000 times with water and applied to vegetables, a high insecticidal effect was observed on aphids and moths.

〔The invention's effect〕

The present invention is superior in stability of the active ingredient as compared with those of the conventional formulation, and also has a high control effect and safety for humans and animals,
It is an object of the present invention to provide an ideal agricultural and horticultural powder, a wettable powder and a method for stabilizing the same, which have low fish toxicity.

Claims (3)

(57) [Claims] (1) Expression Agricultural and horticultural powder, characterized in that a compound represented by the formula (1) is used as an active ingredient, and one or more selected from vegetable oils and nonionic surfactants are blended in an amount of 0.2 to 5.0% with respect to the total amount. Japanese medicine. 2. The nonionic surfactant is a fatty acid ester of sorbitan, a polyoxyethylene ether of sorbitan ester, a polyoxyethylene ether of alkylamine, a polyoxyethylene ether of alkylphenol, or an alkylol amide of fatty acid. A powder for agricultural and horticultural use according to claim (1),
Wettable powder. 3. The expression In agricultural and horticultural powders and wettable powders containing a compound represented by the following as an active ingredient, one or more selected from vegetable oils and nonionic surfactants are compounded in an amount of 0.2 to 5.0% based on the total amount. A method for stabilizing agricultural and horticultural powders and wettable powders.