JP2000001404A - Spreader composition for agrochemical - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prepare the subject composition capable of improving wettability without lowering the quantity of agrochemicals sticking crops and useful for strengthening the effectiveness of agrochemicals by including sorbitan esters of fatty acids, poly (oxyethylene alkyl ether) or the like in a specific content ratio. SOLUTION: This composition is prepared by including (A) 100 pts.wt. sorbitan esters of fatty acids, (B) 5.0-66.0 pts.wt. (pref. 5.6-65.3 pts.wt.) poly (oxyethylene alkyl ether), pref. a compound of formula I [(m)+(n) is 9-11; (x) is 3-9] and (C) 1.0-6.0 pts.wt. (pref. 1.2-5.6 pts.wt.) polyether-modified silicone, pref. a compound of formula II [(m)+(n) is 10-100; (a)+(b) is 5-60]. It is pref. that the ingredient A is HLB 1.8-4.3 and a monoester of a fatty acid such as oleic acid (e.g. sorbitan monoester of oleic acid).

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a spreader composition, and more particularly, to a spreader used in a spray liquid for the purpose of enhancing the efficacy of a pesticide.

[0002]

2. Description of the Related Art Epidermis surfaces such as leaves, stems and insects of plants have components or structures which repel liquid wetting. For this reason, the sprayed pesticides cannot be sufficiently effective. Therefore, a spreading agent is used to enhance various properties such as wetting, penetration, spreading, and sticking to the sprayed pesticide to increase the medicinal effect.

Conventionally, non-ionic surfactants such as polyoxyethylene alkyl ether, polyoxyethylene alkyl ester, sorbitan fatty acid ester, and polyoxyethylene alkyl allyl ether have been used as this kind of spreading agent.
Anionic surfactants such as dialkyl sulfosuccinic acid sodium salt and dinaphthyl methanesulfonic acid alkali salt;
Other surface active substances have been used as spreading agents.

However, when these spreading agents are used, properties such as wettability and wettability are improved, but on the other hand, there is a tendency that the adhering amount of the spray liquid to the target object and the sticking property of the agricultural chemical component are reduced.

[0005]

SUMMARY OF THE INVENTION An object of the present invention is to provide a spreader composition which can solve the above-mentioned drawbacks of the conventional spreaders.

[0006]

The technique used as the substrate of the present invention is based on a sorbitan fatty acid ester having a low HLB value (6.7 or less, preferably 1.8 to 4.3), and one mole of ethylene oxide added.
A secondary alcohol derivative having 14 to 19 carbon atoms of 0 or less,
And a composition containing three specific compounds, polyether-modified silicone, having an HLB of 13 or less, preferably 10 or less, and a viscosity [(25 ° C.) CS] of 20,000 or less, is used as a spreading agent.

To characterize the spreading composition of the present invention,
The characteristics of the components will be described below.

Component 1: Sorbitan fatty acid ester As the sorbitan fatty acid ester used in the present invention, those having an HLB value of preferably 6.7 or less, particularly preferably 1.8 to 4.3 are used. As the fatty acid component, oleic acid, lauric acid, palmitic acid or stearic acid can be exemplified as preferable ones.
Used in the form of mono, sesqui, di, tri-ester.

Particularly preferred are sorbitan oleate, more specifically sorbitan mono-oleate (HLB 4.3), sorbitan sesqui oleate (H
LB3.7), sorbitan trioleate (HLB)
1.8) and the like are particularly preferably used.

Component 2: polyoxyethylene alkyl ether polyoxyethylene alkyl (second having 12 to 14 carbon atoms)
Grade alcohol) ether is preferably used, and the general formula is as follows.

[0011]

Embedded image

(Where m + n = 9 to 11, x = 3 to 9) More specifically, the nonionic surfactants exemplified in Table 1 are used.

[0013]

[Table 1] (However, EO means ethene oxide.)

Component 3: Polyether-modified silicone In the present invention, two types of side-chain-modified polyester-modified silicone and linear repeating polyester-modified silicone are used.
Kind is used. At this time, the side chain-modified polyether-modified silicone (hereinafter abbreviated as side-chain-modified silicone)
Can be used alone, but the linear repeating type polyether-modified silicone (hereinafter abbreviated as linear-type modified silicone) is always used in combination with the side-chain-type modified silicone,
The use ratio is 30% by weight or less, preferably 28% by weight or less, based on the side-chain type modified silicone.

Although this linear modified silicone has a large molecular weight, a high viscosity and is insoluble in water, it can be dissolved or self-emulsified in water when used in combination with the side chain modified silicone in the above-mentioned mixing ratio. This linear-type modified silicone is inferior to the side-chain-type modified silicone in lowering the surface tension of the pesticide spray liquid, but greatly contributes to the surface viscosity effect and the effect including water. By blending it as one component of the agent composition, it is effective in increasing the amount of the drug solution attached to the crop and improving the drug sticking property. As the side chain-modified silicone, a compound represented by the following general formula is used.

[0016]

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(Where m + n = 10-100, a + b =
5 to 60) Examples of preferred specific examples include various silicone surfactants shown in Table 2.

[0018]

[Table 2]

However, in the table: NUC Silicone L-Part No .: Shin-Etsu Silicone KF-Part No. manufactured by Nihon Unica Co., Ltd .: Toshiba Silicone TSF-Part No. manufactured by Shin-Etsu Chemical Co., Ltd.

As the linear modified silicone, a compound represented by the following general formula is preferably used.

[0021]

Embedded image

(However, m + n = 300 to 1200, a +
(b is the same as above.) A preferred specific example is NUC Silicone L-2222 (trade name, manufactured by Nippon Unica Co., Ltd.)
HLB6].

In the spreader composition of the present invention, component 1,
The mixing ratio of Component 2 and Component 3 is such that Component 2 (polyoxyethylene alkyl ether) is 5.0 to 66 parts by weight, preferably 5.6 to 65.3 parts by weight, based on 100 parts by weight of Component 1 (sorbitan fatty acid ester). Component 3 (polyether-modified silicone) 1.0 to 6.0 parts by weight, preferably 1.
3 to 5.6 parts by weight.

At this time, when the component 2 is less than 5.0 parts by weight, the spreading composition becomes water-soluble or non-dispersible.
When the amount is more than the weight part, the sticking property of the pesticide used on the crop surface becomes weak. If component 3 is less than 1.0 part by weight, the wet spreadability of the spray liquid on crops that are difficult to wet with water will be inferior,
When the amount exceeds 6.0 parts by weight, the surface tension lowering ability of the spray liquid becomes large, but the adhesion of the pesticide becomes worse, and the pesticide once adhered also deteriorates the rain resistance.

The means for preparing the spreader composition of the present invention is not specified at all, and any means may be used as long as the above components 1 to 3 are mixed at a predetermined ratio to form a composition.

The method of using the spreader composition of the present invention is no different from the conventional method of using this kind of spreader, and is used in combination with an agricultural chemical. For example, it may be diluted with water and sprayed by an appropriate means such as spraying. The dilution ratio at this time is also appropriately determined according to the target crop, the type of pesticide, and the like. The most typical use method is to dilute the spreading agent composition of the present invention with water so as to have a predetermined dilution factor, mix a predetermined amount of a pesticide to be used such as a fungicide or an insecticide therein, and stir well. To prepare a spray liquid.

[0027]

[Experimental Examples] Experiments will be described to better understand the contents of the present invention. In each of the experiments performed below, the performance evaluation of “wettability” and “adhesion” in the table was based on the following method.

<Wetability Test> The test method was to visually measure the state when a pesticide (Note 1) containing a predetermined spreading agent was sprayed on the surface of a polyethylene film (Note 2) having a hydrophobic surface. . The evaluation was based on the following criteria. ：: When sprayed, the film surface wets well with the liquid,
A state in which moisture adhering to the surface is not repelled and does not aggregate (shrink) even during drying. Δ: A state in which the liquid appears to be wet well during spraying, but the adhered liquid is partially repelled during drying after spraying, and a decrease in liquid shrinkage is observed. ×: The liquid was repelled during spraying, and the wetting was poor. Note 1: Acaricide (manufactured by Nissan Chemical Industries, Ltd., trade name: Sunmite wettable powder). Hereinafter, "agrochemical" means sunmite wettable powder unless otherwise specified. Note 2: Low energy surface (31 to 31.2 erg / cm)
² ) High-density polyethylene film (1m thick)
m, size 10 cm x 15 cm). The surface is wiped clean with acetone.

<Adhesion Test> Pesticides are weighed according to Table 3 (standard sample for judging the amount of drug adhered). The weighed pesticide is uniformly spread on the polyethylene film using 0.4 ml of "wetting agent" (Note 3) and dried. Six grades from A to F shown in Table 3 are ranked according to the amount of the pesticide applied on the film (the degree of white coloring), and used as a standard sample for comparative measurement of the applied amount. (Note 3) Wetting agent: a surface tension of 29 to 29.5 dynes / cm (20 ° C.) using a polyoxyethylene alkyl ether type nonionic surfactant (trade name: Sophthanol 30) manufactured by Nippon Shokubai Co., Ltd. An aqueous solution prepared to be

The aqueous solution of the spreading agent (each composition in each table) prepared at a predetermined dilution ratio was used as a wetting agent (0.4 ml), and 0.016 g of the pesticide was uniformly spread on the film.
dry. Thus, 0.016 g using each spreading agent
Make a series of samples with the pesticides spread and deposited on the film.

After leaving each of the samples prepared above at room temperature for 12 to 15 hours, the sample was fixed at a 45 ° angle with the surface to which the drug was attached facing upward, and water (20 to 22) was placed under a certain condition from a height of 100 cm. C) for 10 minutes. The amount of the pesticide remaining on the film after drying is evaluated in comparison with the standard sample prepared above.

[0032]

[Table 3] Standard sample for determining drug adhesion amount

[Experiment 1] Sorbitan fatty acid ester (sorbitan mono-ester) used as one component of the spreading agent of the present invention
Oleate) was examined. Table 4 shows the results. From Table 4, the best content of sorbitan mono-oleate in the composition was 60 to 80% by weight (calculation excluding solvent).

[0034]

[Table 4]

In the table Note 1): Oily suspended matter is generated when diluted with water Note 2): Insoluble in water Note 3): Insoluble in water

[Experiment 2] The optimum blending ratio of polyether-modified silicone (Shin-Etsu Silicone KF-905 was used in this experiment) was examined. The results are shown in Table 5.

As to the content of the polyether-modified silicone, 0.8 to 3.0% by weight, preferably 1 to 2.5% by weight (calculation excluding the solvent) showed good results. The higher the content of the polyether-modified silicone, the better the wettability but the worse the adhesion.

[0038]

[Table 5]

[Experiment 3] The effect of spreading polyoxyethylene derivatives depending on the variety was examined. The results are shown in Table 6.

Ethylene oxytate addition number 9 or less, H
Nonionic surfactants of polyoxyethylene derivatives having an LB of 12 or less gave good results.

[0041]

[Table 6]

In the table Note 1): The diluent is separated.

[Experiment 4] The spreading effect due to the difference in polyether-modified silicone variety was examined. The results are shown in Table 7.

[0044]

[Table 7]

In the table Note 1): The composition is insoluble in water or an oily substance separates over time even if dispersed.

According to Table 7, the polyether-modified silicone has an HLB of about 7 to 13 and a viscosity (25 ° C., CS) of 3
About 00 to 700 are suitable as the spreading agent component of the present invention. In addition, as shown in Table 10 especially in Examples described later, a combination of low-viscosity silicone and high-molecular-weight silicone can be effectively used in the present invention.

[Experiment 5] The spreading effect of sorbitan fatty acid ester type surfactants depending on the variety was examined. Separately, the effect of the glycerol fatty acid ester type surfactant is also shown for comparison.

Sorbitan mono-oleate, sorbitan sesqui-oleate, sorbitan tri-oleate, sorbitan mono-palmitate, sorbitan mono-stearate and the like can be effectively used as the sorbitan fatty acid ester type surfactant of the present invention.

[0049]

[Table 8]

[Experiment 6] A comparative test of "wetting property" and "adhesion property" between the spreading agent of the present invention and a commercially available spreading agent was performed. The results are shown in Table 9.

[0051]

[Table 9]

[0052]

EXAMPLES The present invention will be specifically described below with reference to examples.

[0053]

Example 1 An example relating to the amount of drug attached to citrus leaves when various spreading agents are added to the pesticide spray liquid.

When a pesticide is sprayed on a crop which is easily wetted by water, such as citrus, when a spreading agent which lowers the surface tension is added, the amount of the drug solution attached decreases, and the medicinal effect tends to decrease accordingly.

When a chemical solution having a low surface tension is sprayed on a plant which is usually easily wetted by water, the surface of the plant is well wet.
The amount of adhering liquid itself decreases. Conversely, for parasitic insects and mites having an epidermis that is difficult to get wet with a chemical, a chemical with a lower surface tension can improve adhesion and permeability.

As described above, in the application of the pesticide, a trade-off relationship occurs as described above. Therefore, a spreading agent which has a surface tension lowering ability and a small effect of lowering the amount of the drug attached to the crop is desirable.

The medicinal solution prepared according to Table 10 was sprayed on Citrus Unshu mandarin orange (15th grader) to obtain a leaf area of 50.
The amount of the adhering liquid per 0 cm ² was examined. As can be seen from Table 10, the amount of the adhering liquid decreases due to the decrease in the surface tension of the spray with the spreading agent as compared with the spray with the pesticide alone. However, the spray with the spreading agent of the present invention has a smaller decrease rate of the amount of drug attached than the conventional spreading agent.

[0058]

[Table 10]

In the table, Note 1): predetermined dilution ratio Note 2): See Table 11, where Table 11 shows the composition (parts by weight) of the spreading agent composition of the present invention. Note 3): See Table 12, where Table 12 shows the components of commercially available spreading agents. Note 4): Use of DUNOUY surface tensiometer manufactured by Shimadzu Corporation. Note 5): Amount of attached liquid. The resulting mixture is sprayed with a small atomizer until a saturated spray rate is reached. When the liquid on the leaves no longer drip after spraying, the leaves (1
(0-12 sheets) Carefully collect in a plastic bag of known weight. The plastic bag containing the leaves is weighed, then the leaves are taken out of the bag and the liquid on the leaf surface is removed with absorbent paper. Then, the leaves are weighed and the amount of adhering liquid is calculated. Measure the leaf area (manufactured by Hayashi Denko
Area meter AMM-8 type used), leaf surface (front + back) 100cm
Request adhering liquid amount calculated per ^2.

[0060]

[Table 11]

[0061]

[Table 12]

Claims (5)

[Claims] 1. A polyoxyethylene alkyl ether of 5.0 to 6 parts per 100 parts by weight of a sorbitan fatty acid ester.
6.0 parts by weight, polyether-modified silicone 1.0 to
A spreading agent composition comprising 6.0 parts by weight. 2. A polyoxyethylene alkyl ether of 5.6 to 100 parts by weight of sorbitan fatty acid ester.
65.3 parts by weight, 1.2 parts of polyether-modified silicone
The spreading agent composition according to claim 1, wherein the amount is from 5.6 to 5.6 parts by weight. 3. The sorbitan fatty acid ester, wherein the fatty acid is oleic acid, lauric acid, palmitic acid or stearic acid.
The spreading composition according to claim 1, which is a di- or triester. 4. A polyoxyethylene alkyl ether,
The following general formula: The spreading agent composition according to claim 1, wherein the composition is represented by the formula: (where m + n = 9 to 11, x = 3 to 9). 5. The polyether-modified silicone has the following general formula: (Where m + n = 10-100, a + b = 5-6
0) or Is represented by a viscosity (25 ° C. CS) of 20 to 20,000,
The spreading agent composition according to claim 1, wherein the HLB is 6 to 13, and in the case of the compound represented by the above [Chemical Formula 3], the HLB is used in combination with the compound represented by the [Chemical Formula 2].