JPH08268803A - Pesticide composition - Google Patents

Abstract

PURPOSE: To obtain an agrochemical composition previously diluted with water to a concentration for use and usable as it is. CONSTITUTION: This agrochemical composition comprises (A) 0.5-10wt.% of a water-insoluble organic solvent having H1 specific gravity, (B) 0.1-1wt.% of a nonionic surfactant having <=10HLB or a surfactant obtained by combining the nonionic surfactant with <=30wt.% of an oil-soluble nonionic surfactant based on the total of the surfactants, (C) 0.01-1wt.% of a finely powdered or liquid main agent of an agrochemical and (D) at least 90wt.% of water and is obtained by previously blending the components A, B and C under stirring, making them sufficiently mixable, adding the component D to the mixture and uniformly blending them under stirring. In the agrochemical composition, a water-in-oil type emulsion or an oil phase containing the finely powdery or liquid main agent of an agrochemical at the upper part of a water phase when the component is allowed to stand exists and is readily made into a suspension by light shaking.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to an agrochemical composition which can be used by simply shaking it without diluting it with water etc. when applying it to plants, and various chemicals for protecting plants from harmful insects and diseases, and further weeding. The present invention relates to an agrochemical composition that can be widely used for agricultural and horticultural use, such as an agent and a growth regulator.

[0002]

2. Description of the Related Art Conventionally, emulsions and wettable powders have been generally used as pesticide formulations for liquid spraying. Emulsions generally consist of an agrochemical main ingredient, a surfactant and a large amount of organic solvent, but they have drawbacks such as the flammability and malodor of organic solvents, which account for most of the formulation, and phytotoxicity to plants. On the other hand, the wettable powder is a powdered agricultural chemicals main ingredient mixed and homogenized with a hydrophilic clay mineral carrier, and a surfactant is also used as a preparation, which is suspended in water before use. It is inconvenient to handle because the powder scatters or does not disperse rapidly and uniformly when suspended in water, and there are drawbacks such as insufficient stability over time, and anxiety about solidification. There were many things. For this reason, the main agricultural chemicals are dispersed in water or an aqueous medium with a surfactant so that no dust is generated during the preparation of the spray liquid and the emulsion can be handled quantitatively like conventional emulsions. Aqueous suspension type agricultural chemical composition and
An aqueous emulsion composition having a composition of water-surfactant-agricultural agent main ingredient which has been solubilized by wet pulverizing the agrochemical principal agent in water or an aqueous medium has been studied and developed. In addition, these dosage forms generally have the drawback that dispersed particles settle out or oil is easily separated and difficult to redisperse, and various proposals have been made to solve these drawbacks (Japanese Patent Laid-Open No. 52-148625).
JP-A-53-20431, JP-A-55-1730
No. 1).

[0003]

The above-mentioned conventional emulsions and wettable powders are those for diluting and spraying a high-concentration emulsion or water solvent with water to disinfect and cure the target pests or plant diseases. is there. Further, even in the case of a water-suspended pesticide composition or an aqueous emulsion composition, it is basically a composition that is presumed to be diluted with water as in the case of other emulsions. When performing pest control or weeding work on plants with such a pesticide composition, it is time-consuming to dilute a high-concentration drug to a use concentration, and discomfort given to the worker during the work, that is, an inconvenience such as a foul odor or a dirty hand. , There are drawbacks. Since the aqueous emulsion composition has little flammability, it may be used as a concentrated trace amount spray solution unlike other emulsions, but this spray method (ULV method) requires a special sprayer. There is a problem, and in a narrow sense, it can be said to be a technology in a different field from the dilution spraying method.

Conventionally commercially available emulsions, wettable powders, etc. are not so problematic when diluted immediately with water and then sprayed immediately, but no consideration is given to the stability of the main agricultural chemicals in the diluted solution over time. Therefore, if you store it for a while,
Since the powder is precipitated and the oil is agglomerated and floated, and the drug is easily decomposed, there is a problem that it cannot be stored for a long period of time. Therefore, it cannot be diluted in advance to the use concentration. The same applies to water-suspended pesticide compositions and aqueous emulsion compositions, and various examinations and proposals have been made regarding the suspension and dispersibility of the main pesticide in the pesticide composition before dilution. No study has been conducted on the suspension and dispersibility over time. It is considered that this is because the conventional pesticide composition is diluted with water and sprayed.

Therefore, unlike the conventional method, the object of the present invention is to provide an agrochemical composition which is diluted with water to a use concentration and can be used as it is, a so-called undiluted agrochemical composition. Especially. Another object of the present invention is to provide an undiluted pesticide composition having excellent dispersibility of an active ingredient and stability over time, and also good redispersibility and dispersion stability after shaking, in association with the above object. Especially.

[0006]

According to the present invention, in order to achieve the above-mentioned object, (A) 0.5 to 10% by weight of a water-insoluble organic solvent having a specific gravity of 1 or less (B) 0.1 to 1% by weight. % HLB 10 or less nonionic surfactant or a surfactant obtained by combining 30% by weight or less of the total amount of the surfactant with an oil-soluble anionic surfactant (C) of 0.01 to 1% by weight. It consists of a fine powder or liquid agricultural chemical main ingredient, and (D) at least 90% by weight of water. The components A, B and C were mixed by stirring in advance, and then the component D was added and uniformly mixed by stirring. A pesticide that is a composition and has a water-in-oil emulsion phase or oil phase containing a fine powdery or liquid pesticide base agent on the upper side of the aqueous phase when standing still, and easily becomes a suspension by light shaking. A composition is provided.

[0007]

[Working] That is, the pesticidal composition of the present invention has a problem of diluting liquids such as conventional emulsions, that is, if the pesticidal composition is a powder and the pesticide main ingredient is a powder, the pesticidal composition has poor redispersibility. In the case of oil, the problem that the drug is easily flocculated and floating and easily oxidatively decomposes, so by using the above-mentioned specific organic solvent and surfactant, the main agricultural chemical is located in the upper layer part, and the upper part of the aqueous phase It was solved by making it exist in the water-in-oil type emulsion phase or the oil phase. Furthermore, since a large amount of water was used, it was already in the composition range at the time of dilution, and it was possible to redisperse the agrochemical main ingredient by shaking gently, so that the composition could be applied as it is. It constitutes a diluted pesticide composition. Such a low-concentration undiluted pesticide composition that is applied as it is without dilution is a completely new pesticide composition that has not existed in the past.

As a result of intensive studies by the present inventors, by using a specific organic solvent and a surfactant, and by mixing these with water and a main agricultural chemical agent in a specific quantitative ratio, the aqueous phase of There is a water-in-oil type emulsion phase or an oil phase in which a fine powdery or liquid (oil) main agricultural chemicals is dispersed and contained in the upper part, and it can be easily made into a uniform suspension by shaking lightly during use. It has been found that an agrochemical composition excellent in redispersibility and resuspension which can be stably maintained in the state as it is for a long time (about several minutes to several tens of minutes) is obtained. Further, the active ingredient is stably dispersed and exists in the water-in-oil emulsion phase or the oil phase, and therefore the active ingredient is hardly decomposed and is extremely stable over time.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION Each component will be described below. First, as the organic solvent used in the present invention, a water-insoluble solvent having a specific gravity of 1 or less is used. Examples thereof include aromatic hydrocarbons such as toluene and xylene, and non-aromatic hydrocarbons having 6 or more carbon atoms such as hexane, n-paraffin, and kerosene. In addition, any one can be used according to the purpose of the product. The amount of the organic solvent is 0.5 to 10% by weight, and preferably 1 to 3% by weight, based on the stability, redispersibility and resuspensionability of the suspension.

As the surfactant, an HLB of 10 or less, preferably 4 to 10 of a nonionic surfactant capable of producing a water-in-oil emulsion, or 30% by weight or less of the total amount of the surfactant is used as an oil-soluble anion. A surfactant containing an ionic surfactant is used. As the nonionic surfactant having an HLB of 10 or less, which can produce a water-in-oil emulsion,
A sorbitan monooleate, sorbitan monolaurate, polyethylene glycol fatty acid ester having an HLB of less than 8 or the like, which is capable of producing a water-in-oil emulsion alone, or a mixture thereof, or a water-in-oil emulsion alone of these surfactants is produced. It is a mixed surfactant containing nonionic surfactants such as polyoxyethylene alkylallyl ether of HLB 8 or higher, polyoxyethylene sorbitan fatty acid ester, polyethylene glycol fatty acid ester, etc., which adjusts the properties of the water-in-oil emulsion. A mixture having an HLB value of 10 or less can be used. Oil-soluble anionic surfactants are added to improve the dispersibility of the main agricultural chemicals, such as alkaline earth metal salts of alkylbenzene sulfonates such as calcium dodecylbenzene sulfonate and higher fatty acid alkaline earth metal salts. Available. The amount of the surfactant used in the present invention is 1% by weight or less of the total composition from the viewpoint of stability or redispersibility / suspensionability of the suspension, and preferably 0.1% or less.
0.5% by weight.

As the agrochemical main agent used in the present invention, both fine powder and liquid (oil) can be used, and as the powdery agent, fungicides such as NAC, TPN, MBC, sulfur, zineb, thiophanate methyl, benomyl and the like. And herbicides such as glyphosate and bialaphos, and the particle size thereof is usually 100 μm or less, preferably 30 μm or less. Liquid pesticide bases include MEP,
Examples thereof include organophosphorus insecticides such as malathion, and pyrethroid insecticides such as allethrin and permethrin. The amount of the agrochemical main agent used is 0.01 to 1% by weight, preferably 0.1 to 0.5% by weight, based on the total composition.

In the present invention, the water used as the floating medium for the dilution medium or emulsion phase or oil phase is preferably ion-exchanged water, and the amount thereof is 90% by weight or more, preferably 95 to 99% by weight of the total composition. %.

An example of the method for producing an undiluted pesticide composition according to the present invention will be described. First, a predetermined amount of a powdered pesticide main ingredient and / or a liquid pesticide main ingredient, an organic solvent, and a surfactant are mixed, and a certain period of time, for example, After stirring for about 10 to 30 minutes, the liquid agricultural chemical main agent is dissolved, and the powdered agricultural chemical main agent is sufficiently mixed with the organic solvent and the surfactant, and then a predetermined amount of water is added and the mixture is stirred again.
This gives a uniform suspension, but if this is left for a long time, depending on the harmony of the emulsified state, etc., there is a water-in-oil emulsion phase containing the main agricultural chemical in the upper part of the aqueous phase. Or, moreover, the oil phase separates on top of it. In terms of suspension stability after shaking, the former suspension state is better than the latter, but in either state, shaking a few times gives a uniform suspension, and this state is maintained for a relatively long time. Since it is maintained (several minutes to several tens of minutes), there is sufficient margin for spraying.

[0014]

[Examples] The present invention will be specifically described below with reference to Examples and Comparative Examples. Examples 1 to 11 and Comparative Examples 1 to 3 Agricultural chemical compositions containing various surfactants were prepared according to the following compositions. Powder main agent TPN 0.30% by weight Liquid main agent Permethrin 0.18% by weight Organic solvent n-paraffin 1.00% by weight (C _{12 to} C ₁₆ ) Surfactant Described in Table-1 and Table-2 0.30% by weight % Water Ion-exchanged water 98.22% by weight −−−−−−−−−−−−−−−−−−−−−−−−−−−− 100.00% by weight The manufacturing method is as follows. Quantitative powder and liquid base agent, organic solvent,
After mixing the surfactant and stirring for 10 to 30 minutes, the liquid main agent is dissolved, and the powdery main agent is sufficiently blended with the organic solvent and the surfactant, and then a predetermined amount of water is added and stirred to obtain the pesticide composition. Made. Dispersibility at rest for each composition, redispersibility,
The dispersion stability and the precipitation of fine powder were evaluated. The results are shown in Table-1 and Table-2.

The meanings of the reference numerals of the respective evaluation items in the following tables are as follows. a) Dispersion state of the agrochemical main agent at rest A The agrochemical main agent is present in the upper part of the water phase as a water-in-oil emulsion. B The pesticide base is present between the water-in-oil emulsion phase of A and the upper part of the water phase. C A state in which the main agricultural chemical is aggregated and dispersed, and is not dispersed in a state in which it can be used as an agricultural chemical. b) Redispersibility (condition when lightly shaken several times after standing) ◎ Disperse uniformly. ○ Almost uniformly dispersed, but some aggregates. × There are large aggregates that cannot be used as pesticides. c) Dispersion stability The time during which the emulsion was re-dispersed was examined. ◎ 30 minutes or more ○ 3 to 30 minutes × 0 to 3 minutes d) Precipitation of fine powder and precipitation of agglomerates (condition when standing) ◎ No or slight precipitation. ○ There is a small amount of precipitate. × There is a large amount of precipitate.

[0016]

[Table 1]

[0017]

[Table 2]

As is clear from the results shown in Tables 1 and 2 above, in each of the examples, the dispersion state upon standing and the redispersibility and the dispersion stability after several gentle shaking after standing were observed. A preferable pesticidal composition which is excellent and does not cause precipitation of fine powder was obtained. However, in Comparative Examples 1 to 3, since the composition using a surfactant having HLB of 10 or more, the pesticide main agent was dispersed as small aggregates. However, a homogeneous dispersed state could not be obtained.

Examples 12 to 26 Various agrochemical compositions were prepared by using the various agrochemical bases shown in Table 3 and the same surfactant as that used in Example 3 by the same production method as in Examples 1 to 11. Prepared. The evaluation results of the dispersion state of each composition are also shown in Table 3. As shown in Table-3, preferable agrochemical compositions were obtained in each example.

[0020]

[Table 3]

Example 27 An agrochemical composition having the following composition was prepared in the same manner as in Examples 1-11. Powdered main agent TPN 0.30% by weight Liquid main agent Permethrin 0.18% by weight Organic solvent n-paraffin 1.00% by weight (C _{12 to} C ₁₆ ) Surfactant Sorbitan monooleate Polyoxyethylene (n = 20) Sorbitan trio Rate Calcium dodecylbenzene sulfonate 0.30% by weight water Ion-exchanged water 98.22% by weight ------------------------------. -Total 100.00% by weight Table showing the results of testing the stability of the obtained agricultural chemical composition over time-
4 shows. In addition, as a comparison, a test result of stability over time of a diluting solution (300-fold solution) prepared by diluting a commercially available emulsion (5%) obtained by dissolving permethrin in a solvent kerosene to the same concentration as in Example 27 is shown in Table-. 5 shows. According to the pesticide registration application practice book (Agricultural Chemical Industry Association), storage at 40 ° C for 1 month is considered as storage at room temperature for 1 year.

[0022]

[Table 4]

[0023]

[Table 5]

As is clear from the above results, in the case of the conventional emulsion diluting solution, significant decomposition of the active ingredient is observed during storage, but in the case of the agrochemical composition of the present invention, such a phenomenon is hardly observed. It can be seen that it is not seen and is excellent in stability over time.

Examples 28 to 34 Agrochemical compositions were prepared in the same manner as in Examples 1 to 11 with the compositions shown in Table-6. With respect to each of the obtained agrochemical compositions, an efficacy test against plant pests and a phytotoxicity test were conducted. The results are also shown in Table-6. In the test, roses (Sonia 70 cm, age 5 years, alley planting) were used to target the aphid, Aphis gossypii. As is clear from the test results shown in Table-6, if the amount of the main agrochemical agent is too small, sufficient insecticidal effect cannot be obtained, and conversely, if it is too large, phytotoxicity occurs. Although it depends on the kind of the agrochemical main agent used, it is generally desirable to set the concentration within the range of 0.01 to 1% by weight, preferably 0.1 to 0.5% by weight.

[0026]

[Table 6]

[0027]

As described above, the pesticidal composition of the present invention comprises
By using a water-insoluble organic solvent having a specific gravity of 1 or less and a specific surfactant having an HLB of 10 or less, and mixing these with water and a main agricultural chemical agent in a specific quantitative ratio, a fine powder is formed on the upper portion of the aqueous phase during standing. Water-in-oil emulsion phase containing a solid or liquid pesticide base or a suspension state in which an oil phase is present, and by gently shaking this, a uniform suspension can be easily obtained, and this state is maintained for a relatively long time. maintain. Therefore, the agrochemical composition of the present invention is excellent in redispersibility and dispersion stability after shaking, and since the agrochemical main ingredient has already been set to the use concentration, it is not necessary to further dilute with water, and simply shaken gently. The so-called undiluted pesticide composition can be applied as it is to the plants as it is, and there is a sufficient margin for spraying. In addition, since the main agricultural chemical is present in a water-in-oil emulsion phase or dispersed stably in the oil phase during standing and storage, there is no precipitation of fine powder or agglomerates of the main agricultural chemical, and more effective ingredients. Almost no decomposition and is extremely stable over time.

Claims (1)

[Claims] 1. A water-insoluble organic solvent having a specific gravity of 1 or less, 0.5 to 10% by weight, and a nonionic surfactant having an HLB of 10 to 10%, or 0.1 to 1% by weight. Surfactant comprising 30% by weight or less of the total amount of an oil-soluble anionic surfactant in combination (C) 0.01 to 1% by weight of a fine powdery or liquid pesticide base, and (D) at least 90% by weight It is a composition consisting of water, which is prepared by stirring and mixing components A, B, and C in advance and then thoroughly blending it, and then by adding component D and stirring and mixing uniformly. Alternatively, an agricultural chemical composition in which a water-in-oil emulsion type oil phase or an oil phase containing a liquid main agricultural chemical is present and easily becomes a suspension by light shaking.