JP4570394B2 - Agrochemical spreading agent containing glycerin-modified silicone - Google Patents

Description

The present invention relates to an agrochemical spreading agent containing a glycerin-modified silicone having a specific structure. The glycerin-modified silicone significantly reduces the interfacial tension of hydrocarbon oils and plant extracts, and evenly adheres them to the entire leaf surface, thereby improving their insecticidal effect and the like.

When applying agricultural chemicals to crops for the purposes of weeding, pest control and disease prevention, the efficacy of the agricultural chemicals on the crops will be reduced. A method to reduce the surface tension of the aqueous solution of the agricultural chemical by adding a surfactant for the purpose of allowing the agricultural chemicals to uniformly adhere to the crop as soon as possible after spraying and adding a surfactant to the inside of the leaf before it rains. Has been taken. As the surfactant, in addition to polyoxyethylene alkyl ether, polyoxyethylene alkyl phenyl ether, polyoxyethylene higher fatty acid ester, and the like, silicone surfactants are used because of their low toxicity and high surface activity. Among silicone surfactants, polyether-modified silicone having a trisiloxane skeleton in the main chain has high surface activity and has been put to practical use as a spreading agent for agricultural chemicals (Patent Document 1). Further, the above silicone has a drawback that the surface activity is lowered when the pH is acidic or basic, but it has been improved by changing the structure of the siloxane chain (Patent Document 2).

On the other hand, sprays based on hydrocarbon oils and plant extracts are known to have an effect of controlling pests by closing the pores of pests and an effect of improving the penetration of pesticides into the leaves (non- Patent Document 1). However, hydrocarbon oils, in particular plant extracts, have high surface tension and poor wettability to hydrophobic leaf surfaces, and it has been proposed to reduce surface tension by adding alkyl-modified silicone (Patent Document) 3). RE Gaskin et al. Reported that when alkyl silicone was used in the SPRAY OILS-BEYOND 2000 (Published by University of Western Sydney) medium, the spreadability of the plant extract was remarkably improved and effective in pest control. is doing.

Furthermore, recent reports indicate that silicones having three or more hydroxyl groups and silicones having two hydroxyl groups and having a polyoxyethylene group have a surface tension reducing ability, and saccharides are exemplified as functional groups having a hydroxyl group. (Patent Document 4).

Japanese Examined Patent Publication No. 6-55642 Japanese Unexamined Patent Publication No. 2000-327787 European Patent Publication No. 0648413A1 Special Table 2003-533558 J. Agric. Food Chem., 34 (2), 235 "SPRAY OILS-BEYOND 2000", Western Sydney University, 2002

However, the above conventional silicone-based spreading agent needs further improvement in terms of surface activity. Therefore, an object of the present invention is to provide an agrochemical spreader having higher surface activity than conventional spreaders.

That is, the present invention comprises at least one glycerin-modified silicone represented by the following formula (4) or (5) and 0.1 to 100,000 parts by mass of an oil agent with respect to 100 parts by mass of the glycerin-modified silicone. It is an agrochemical spreading agent composition.

The spreading agent of the present invention can reduce the interfacial tension of oil or medicinal components and adhere them to crops widely and evenly.

The spreading agent of this invention contains at least 1 sort (s) of the glycerol modified silicone represented by either of following formula (1)-(3).

In the above formula, R ^{1 s} are each independently an alkyl group having 1 to 30 carbon atoms, preferably 1 to 6 carbon atoms, an aryl group, an aralkyl group, or a fluorine-substituted alkyl group. For example, methyl group, ethyl group, propyl group Group, butyl group, pentyl group, hexyl group, heptyl group, octyl group, nonyl group, alkyl group such as decyl group, cycloalkyl group such as cyclopentyl group, cyclohexyl group, aryl group such as phenyl group, tolyl group, benzyl group And fluorine-substituted alkyl groups such as an aralkyl group such as a phenethyl group, a trifluoropropyl group, and a heptadecafluorodecyl group. Preferably they are a methyl group, an ethyl group, a propyl group, a butyl group, or a phenyl group, More preferably, 80% or more of all R < ¹ > is a methyl group.

The glycerin-modified silicone can be produced by addition reaction of an organohydrogensiloxane and glycerin monoallyl ether (that is, 1-allyloxy-2,3-propanediol). As a preferable example of the silicone represented by the formula (1), addition reaction of the following 1,1,1,3,5,5,5-heptamethyltrisiloxane and 1-allyloxy-2,3-propanediol Compound (4).

Examples of the organohydrogenpolysiloxane used as a raw material for the silicone represented by the formula (2) include M ₂ DD ^H , M ₂ D ₂ D ^H , M ₂ D ₃ D ^H , M ₂ DD ^H ₂ , M ₂ D ₂ ^DH ₂ , M ₂ D ₃ ^DH ₂ and mixtures thereof may be mentioned, and may be a mixture of various cyclic and linear silicones (hereinafter referred to as “equilibrated mixture”) obtained by an equilibration reaction. Good. However, in this specification, the (H ₃ C) ₃ SiO _1/2 group is represented as M, the (H ₃ C) ₂ SiO group is represented as D, and one of the methyl groups in M and D is hydrogen. Certain units are denoted as ^MH and ^DH . Units in which one of the methyl groups is substituted with the substituent ^R are denoted as M ^R and D ^R , respectively. Preferably M ₂ DD ^H which a hydrogen atom contained one ^{_{1, M 2 D 2 D H}} , and M ₂ D ₃ D ^H, more preferably ^{_{M 2 DD H, M 2 D}} 2 D H is used. A glycerin-modified silicone of the formula (2) is obtained by an addition reaction between these organohydrogenpolysiloxanes and glycerin monoallyl ether such as 1-allyloxy-2,3-propanediol.

In the formula (3), r is an integer of 0 to 6, preferably 0 to 3. Examples of the organohydrogenpolysiloxane used as a raw material include MM ^H , MDM ^H , MD ₃ ^MH , and M ^n-Bu D _4.5 ^MH . MDM ^H includes, for example, 1 mol of M ₂ and M _{2 2} ^H and 1 mol and D4 obtained by equilibrating a 1/4 mol acid catalyst _{^{M 2 H, MM H, MDM}} H, M 2 H D, MD 3 M H, equilibrium, such as M ₂ ^H D ₂ of mixture in a even better, or may be a mixture of M ^n-Bu D ₃ M ^H and M ^n-Bu D ₆ M ^H as _{^{M n-Bu D 4.5 M H}} . Preferably MM ^H or MD ₃ M ^H, and more preferably MD ₃ M ^H is used. For example, an addition reaction product of MD ₃ ^MH and 1-allyloxy-2,3-propanediol represented by the following formula (5) is preferable.

The reaction ratio between the organohydrogenpolysiloxane and glycerin monoallyl ether is 0.8 to 1.5, preferably 0.9 to 1.2, in terms of the molar ratio of unsaturated groups such as allyl groups to SiH groups. .

  The addition reaction is desirably performed in the presence of a platinum catalyst or a rhodium catalyst. For example, a catalyst such as chloroplatinic acid, alcohol-modified chloroplatinic acid, or chloroplatinic acid-vinylsiloxane complex is preferably used. Further, sodium acetate or sodium citrate may be added as a co-catalyst.

The amount of the catalyst used may be an amount effective as a catalyst, but the amount of platinum or rhodium is preferably 50 ppm or less, particularly preferably 20 ppm or less. Moreover, you may perform the said addition reaction in an organic solvent as needed. Examples of the organic solvent include aliphatic alcohols such as methanol, ethanol, 2-propanol and butanol, aromatic hydrocarbons such as toluene and xylene, and aliphatic or alicyclic hydrocarbons such as n-pentane, n-hexane and cyclohexane. , Halogenated hydrocarbons such as dichloromethane, chloroform, carbon tetrachloride and the like. Although addition reaction conditions are not specifically limited, It is preferable to make it react for 1 to 10 hours under the recirculation | reflux of an organic solvent.

The glycerin-modified silicone is used by adding it to a commercially available agrochemical oil or agrochemical formulation at a desired concentration. Or you may mix with the oil agent which should be spread | dispersed previously. The amount of the oil is appropriately adjusted from 0.1 to 100,000 parts by mass with respect to 100 parts by mass of the glycerin-modified silicone. If the amount is less than the lower limit, the glycerin-modified silicone may not be sufficiently dissolved. On the other hand, when the above upper limit is exceeded, the interfacial tension effect of the glycerin-modified silicone may be insufficient.

Any oil agent can be used as long as it has an effect of exterminating pests and an effect of improving the penetration of agricultural chemicals into the leaves. Examples thereof include vegetable oils extracted from plant seeds and animal oils such as beef tallow, and these hydrides or esterified products are used. In addition, mineral oils such as machine oil and spindle oil, which are collectively referred to as hydrocarbon oils, are also used.

For example, natural animal and vegetable oils and semi-synthetic fats and oils include avocado oil, linseed oil, almond oil, ibotarou, eno oil, olive oil, cacao butter, kapok wax, kayak oil, carnauba wax, liver oil, candelilla wax, beef tallow, beef leg fat , Beef bone fat, hydrogenated beef tallow, kyounin oil, whale wax, hydrogenated oil, wheat germ oil, sesame oil, rice germ oil, rice bran oil, sugarcane wax, sasanqua oil, safflower oil, shea butter, cinnamon oil, cinnamon oil, jojo Barrow, shellac wax, turtle oil, soybean oil, tea seed oil, camellia oil, evening primrose oil, corn oil, lard, rapeseed oil, Japanese kiri oil, nukarou, germ oil, horse fat, persic oil, palm oil, palm kernel oil , Castor oil, hydrogenated castor oil, castor oil fatty acid methyl ester, sunflower oil, grape oil, bayberry wax, jojoba oil, macadamia Ritz oil, beeswax, mink oil, cottonseed oil, cotton wax, owl, owl kernel oil, montan wax, coconut oil, hydrogenated coconut oil, tricoconut oil fatty acid glyceride, sheep oil, peanut oil, lanolin, liquid lanolin, reduced lanolin, lanolin alcohol , Hard lanolin, lanolin acetate, lanolin fatty acid isopropyl, hexyl laurate, POE lanolin alcohol ether, POE lanolin alcohol acetate, lanolin fatty acid polyethylene glycol, POE hydrogenated lanolin alcohol ether, egg yolk oil and the like.

Avocado oil, almond oil, olive oil, sesame oil, rice bran oil, safflower oil, soybean oil, corn oil, rapeseed oil, persic oil, castor oil, sunflower oil, grape seed oil, cottonseed oil, preferably having a low melting point and liquid at room temperature More preferable are low-priced oils such as safflower oil, soybean oil, corn oil, rapeseed oil, castor oil, sunflower oil, and cottonseed oil.

Examples of the hydrocarbon oil include petroleum-based oils generally called machine oil or spindle oil by those skilled in the art, which are appropriately selected from products of various viscosities and used suitably. In addition, there are ozokerite, α-olefin oligomer, squalane, ceresin, paraffin, paraffin wax, liquid paraffin (mineral oil), polybutene, liquid isoparaffin, microcrystalline wax, petrolatum, etc., among them at room temperature like natural animal and vegetable oils. Liquid α-olefin oligomers, squalane, ceresin, liquid paraffin and liquid isoparaffin are preferred, and liquid paraffin is more preferred.

Similarly, fatty acids, higher alcohols and ester oils which are constituents of vegetable oils can be used as oil agents, but are preferably selected from those which are liquid at room temperature from the viewpoint of use. In the present invention, the oil agent may be a mixture of two or more kinds.

In addition to the oil agent, it may further contain an agrochemical or various additives. Usable agrochemicals include, but are not limited to, herbicides, fungicides, and insecticides. You may mix | blend the antifoamer for suppressing foaming at the time of mixing this agrochemical, for example, the silicone type antifoamer which consists of silicone oil, a silica, etc.

Further, a solvent such as hexane may be blended to form a solution, or LPG or the like may be added and sealed in a can and provided in the form of a spray for spreading on the leaf surface on a small scale. Good.

EXAMPLES Hereinafter, although an Example demonstrates this invention in detail, this invention is not limited by this. The interfacial tension in the examples is a value at 25 ° C., and the interfacial tension with air was measured by a droplet method using a fully automatic interfacial tension system PD-W type manufactured by Kyowa Interface Chemical Co., Ltd. The symbol D or I in parentheses in the table indicates solubility, D is in a finely dispersed state, I is insoluble, and those not specifically described are dissolved to become a transparent liquid. To express. The interfacial tension of dimethylpolysiloxane (having a viscosity at 25 ° C. of 30 mm ² / s) measured by this method was 18.2 mN / m.

Various functional group-modified silicones in this example were prepared in a reactor equipped with a stirrer, a thermometer, and a reflux tube, and an unsaturated group-containing compound in an amount such that the molar ratio of unsaturated groups to SiH groups was 1.05. After adding a solvent and an effective amount of catalyst and reacting while dropping organohydrogensiloxane, the reaction solution was distilled at 100 ° C. under reduced pressure to distill off the solvent.
For example, in Table 1, the glycerin-modified silicone of Example 1 was prepared by adding 100 g of glycerin monoallyl ether, 100 g of isopropyl alcohol and 0.5% by mass of chloroplatinic acid to a reactor equipped with a stirrer, a thermometer and a reflux tube. After 0.05 g was charged and the reaction was carried out by dropping 107 g of pentamethyldisiloxane at 60 ° C. while stirring, the reaction solution was distilled at 100 ° C. under reduced pressure, and the solvent was distilled off.

Examples 2, 4 and Reference Examples 1, 3, 5
The properties of the five types of glycerin-modified silicones prepared, the solubility of the silicone when mixed with various oils, and the interfacial tension of the mixture were measured.

表中、変性基量％は、グリセリンモノアリルエーテル質量／（グリセリンモノアリルエーテル質量+オルガノハイドロジェンシロキサン質量）（％）である。

In the table, the modifying group amount% is glycerin monoallyl ether mass / (glycerin monoallyl ether mass + organohydrogensiloxane mass) (%).

As can be seen from Table 1, the glycerin-modified silicone in the present invention significantly reduces the interfacial tension of the oil agent. In particular, it can be seen that Examples 2 and 4 are excellent in solubility and the interfacial tension is greatly reduced. As can be seen in Reference Examples 3 and 5, the solubility decreased due to the increase in the polysiloxane molecular weight, that is, the modification group content, but there was no problem in the effect of lowering the interfacial tension of the oil.

Further, the change in interfacial tension depending on the amount of silicone added in Examples 2 and 4 was examined. As can be seen from the table below, the liquid paraffin showed a significant effect when added at 1% by mass, and the vegetable oil such as rapeseed oil and soybean oil showed a significant effect when added at 5% by mass.

Comparative Examples 1-3
Various silicones modified with glycerin were prepared in an amount exceeding the range specified in the present invention.

これらのシリコーンはいずれも高粘度であった。また、各種油剤に対する溶解性が低く、混合した後に泡が消えるまで放置している間に、沈降してしまい、界面張力を測定することができなかった。

All of these silicones had high viscosity. Moreover, the solubility with respect to various oil agents was low, and it settled while being allowed to stand until the foam disappeared after mixing, and the interfacial tension could not be measured.

Comparative Examples 4-15
Silicone modified with a compound other than glycerin was prepared, and its interfacial tension was measured as a mixture in the same manner as in the Examples.

As can be seen by comparing Table 1 and Table 4, the silicone of the comparative example had a lower surface activity than the glycerin mono-modified silicone of the present invention. Those modified with isoprenol, ethylene glycol monoallyl ether and trimethylolpropane monoallyl ether showed low ability to reduce interfacial tension in liquid paraffin, but low ability to reduce interfacial tension in vegetable oil. Further, trimethylolpropane monoallyl ether is a dihydric alcohol similar to glycerin monoallyl ether, and is a substituent having a close molecular weight. However, the silicones of Comparative Examples 14 and 15 modified by this have the interfacial tension of vegetable oil. It did not reach the glycerin-modified silicone of the present invention in reducing ability.

Furthermore, as shown in Table 5, the silicone of Example 2 showed an effect when added at 1% by mass (the values shown in Table 2 were transferred for reference), whereas the silicone of Comparative Example 6 and the like. Therefore, it is necessary to add 15% by mass or more, and it can be seen that the glycerin-modified silicone of the present invention has excellent surface activity.

  FIG. 1 and FIG. 2 are photographs taken after dropping a drop (15 μl) of liquid paraffin containing 10% by mass of Example 2 and Comparative Example 6 onto a leaf of summer tangerine, 5 minutes later. It can be seen that the liquid paraffin containing the glycerin-modified silicone of Example 2 which is the glycerin-modified silicone of the present invention is superior in spreading property on the leaves as compared with Comparative Example 6 in which the octyl group is modified.

The spreading agent containing the glycerin-modified silicone of the present invention can reduce the interfacial tension of the pesticidal oil agent and adhere to the entire leaf surface.

It is a photograph which shows the spread on the leaf of the oil agent containing a spreading agent (Example 2). It is a photograph which shows the spread on the leaf of the oil containing a spreading agent (comparative example 6).

Claims (3)

Formula (4) or (5) agrochemical spreader composition comprising a oil agent 0.1～100,000 parts by weight with respect to at least one and the glycerin-modified silicone 100 parts by weight of glycerin-modified silicone represented by object.

The agrochemical spreader composition according to claim 1, wherein the oil agent is at least one selected from the group consisting of paraffin oil, rapeseed oil, and soybean oil. Furthermore, the agrochemical spreading agent composition of Claim 1 or 2 containing an agrochemical.

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