JPH10231202A - Spreading agent for agricultural chemical - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a spreading agent for agricultural chemicals, excellent in surface tension-lowering ability and penetrability and low in foamability. SOLUTION: This spreading agent for agricultural chemicals comprises a compound of the formula: R<1> SR<2> COO (EO)m (PO)n }R<3> [R<1> is a 4-30C alkyl, preferably a linear 10-18C alkyl; R<2> is a 1-3C alkylene; EO is oxyethylene; PO is oxypropylene; (m) is 1-30C, preferably 3-10; (n) is 0-3; R<3> is H or a 1-3C alkyl], for example, the compound of the formula [R<1> is C18 H17 ; R<2> is CH2 CH2 ; (m) is 7; (n) is 0; R<3> is H]. The adduct of a mixture of EO and PO may be either of a random adduct and a block adduct, but the block adduct having an order of EO and PO is preferable.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a spreading agent for agricultural chemicals, and more particularly to a spreading agent having excellent surface tension lowering ability and permeability and low foaming property.

[0002]

2. Description of the Related Art Pesticides such as insecticides, fungicides, herbicides and the like can be absorbed by animals such as plants or pests and exert their effects. However, the waxy components are secreted on the plant surface, feather-like fibers are densely grown, the surface often has fine irregularities, and the animal surface also has a layer of keratin etc. Therefore, there is a problem in that these hinder the penetration or wet spreading of the pesticide, thereby failing to exert the original effect of the pesticide. In order to improve this problem, emulsions, wettable powders and the like as spreading agents are widely used. These are those which obtain surface wetness by lowering the surface tension with a surfactant which is a main component, for example, nonionic surfactants such as polyoxyethylene sorbitan fatty acid ester, polyoxyethylene alkyl ether, and polyoxyethylene fatty acid ester. It is proposed to use anionic surfactants (JP-A-49-30539 and JP-A-6-329503) or anionic surfactants such as sulfonates of lower alkyl esters of fatty acids (JP-A-2-167202). Have been.

[0003]

However, the above-mentioned spreader does not yet have sufficient wet spreadability, or if the wet spreadability is increased, the foaming property is increased and the workability and uniformity of spraying are reduced. In addition, excessive use of pesticides causes environmental problems and adverse effects on agricultural products. An object of the present invention is to provide a low foaming pesticide spreading agent excellent in surface tension lowering ability and permeability to improve the above-mentioned problems.

[0004]

The present invention is a pesticidal spreader comprising a compound represented by the following general formula (1). R ¹ SR ² COO ｛(EO) _m (PO) _n ｝ R ³ (1) (where R ¹ is a straight-chain or branched alkyl group having 4 to 30 carbon atoms, and R ² is a straight-chain or branched alkyl group having 1 to 3 carbon atoms) A chain or branched alkylene group, EO is an oxyethylene group, PO is an oxypropylene group, m = 1 to 30, n = 0 to 3, and when adding an oxypropylene group, EO and PO are added in a block form. May also be added at random, and R ³ represents a hydrogen atom or an alkyl group having 1 to 3 carbon atoms.)

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION In the general formula (1), as a linear or branched alkyl group having 4 to 30 carbon atoms represented by R ¹ , a butyl group, an isobutyl group, a pentyl group, an isopentyl group, a hexyl group , Heptyl group, octyl group, 2-ethylhexyl group, nonyl group, decyl group, undecyl group,
Dodecyl group, tridecyl group, tetradecyl group, pentadecyl group, hexadecyl group, octadecyl group, nonadecyl group, eicosyl group, docosyl group, tetracosyl group, hexacosyl group, octakosyl group, triacontyl group, etc., preferably having 10 carbon atoms ~ 18 linear alkyl groups. When the number of carbon atoms is less than 4 or more than 30, the surface activity such as surface tension and osmotic force is reduced. Examples of the linear or branched alkylene group having 1 to 3 carbon atoms represented by R ² include a methylene group, an ethylene group, an ethylidene group, a propylene group, and a methylethylene group.

The average number of added moles m of the oxyethylene group (EO) is 1 to 30, preferably 3 to 10. 0
In the case of (1), the solubility in water is extremely reduced, and when it exceeds 30, the permeability decreases. The average number of added moles n of the oxypropylene group (PO) is 0 to 3, and the number of added moles is appropriately selected for the purpose of balancing the hydrophobicity and hydrophilicity of the compound of the general formula (1), but exceeds 4 In this case, the hydrophobicity increases too much, the surface tension increases, and the permeability decreases. EO and P
When O is mixed and added, random addition or block addition may be performed, but preferably block addition in the order of EO and PO.

[0007] Examples of the alkyl group having 1 to ³ carbon atoms for R ³ include a methyl group, an ethyl group, a propyl group and an isopropyl group. When the number of carbon atoms is 4 or more, the hydrophobicity becomes too strong, the surface tension increases, and the permeability decreases.

[0008] The spreading agent of the present invention is usually used by adding it to a chemical solution when spraying a pesticide. The concentration used is generally in the range of 20 to 3000 ppm with respect to the chemical solution of the pesticide, but is appropriately adjusted depending on the type of the pesticide and the target plant or animal. The chemical may be an emulsifier or a wettable powder.

[0009]

Effect of the Invention The addition of a pesticide spreading agent of the present invention to a chemical solution lowers the surface tension of the sprayed pesticide, improves the penetrating power, and reduces foaming. Can be sprayed well.

[0010]

Next, the present invention will be described more specifically with reference to examples. The evaluation method used in the examples is shown below. (1) Measurement of surface tension Using a surface tension measurement device (A3 type, manufactured by Kyowa Kagaku Co., Ltd.), the surface tension was measured by adjusting the spreading agent to a pure concentration of 30 ppm with water having a hardness of 3 at 25 ° C. did.

(2) Evaluation of penetrating power 100 ml of a test solution prepared by adjusting the spreading agent to a pure concentration of 30 ppm with water having a hardness of 3 was placed in a 200 ml beaker, and 1 ×
A felt piece having a size of 1 cm and a thickness of 2 mm was placed on the water surface, and a time (second) until the sediment settled was measured.

(3) Foaming test A 50 ml test liquid prepared by adjusting the spreading agent to a pure concentration of 30 ppm with water having a hardness of 3 is placed in a 250 ml stoppered graduated cylinder with a stopper. Shake it upside down,
After 5 minutes, the height of the foam layer was measured.

(4) Compatibility with pesticides A pesticide containing 0.5% by weight of an equivalent mixture of basic copper chloride, cupric hydroxide and basic copper sulfate as a medicinal ingredient is prepared, and a spreading agent is prepared. 200 ppm in pure concentration
Presence or absence of precipitation or phase separation after 4 hours was visually evaluated and indicated in three stages. ：: No precipitation and separation △: Slight precipitation is observed ×: Precipitation occurs

Examples 1 to 9 and Comparative Examples 1 to 4 The spreading agents shown in Table 1 were evaluated, and the results are shown in Table 2.

[0015]

[Table 1]

[0016]

[Table 2]

From the above examples, it can be seen that the spreading agent for agricultural chemicals of the present invention has a well-balanced low surface tension, high permeability and low foaming property.

Claims (1)

[Claims] 1. An agricultural chemical spreader comprising a compound represented by the following general formula (1). R ¹ SR ² COO ｛(EO) _m (PO) _n ｝ R ³ (1) (where R ¹ is a straight-chain or branched alkyl group having 4 to 30 carbon atoms, and R ² is a straight-chain or branched alkyl group having 1 to 3 carbon atoms) A chain or branched alkylene group, EO is an oxyethylene group, PO is an oxypropylene group, m = 1 to 30, n = 0 to 3, and when adding an oxypropylene group, EO and PO are added in a block form. May also be added at random, and R ³ represents a hydrogen atom or an alkyl group having 1 to 3 carbon atoms.)