JPS6075324A - Dispersant for aqueous suspension type preparation - Google Patents

Abstract

PURPOSE:To obtain a preparation capable of maintaining dispersion stability at higher concn. and for longer time and having also superior dispersion stability even in the state diluted with water for spraying by adding a dispersant comprising alkylene oxide adduct of a specified compound as primary component to an aq. suspension type preparation. CONSTITUTION:A dispersant comprising alkylene oxide adduct of a compound having >=2 amino groups in a molecule as primary component is used for aqueous suspension type preparation for agricultural chemicals such as insecticide, disinfectant, herbicide, etc. Examples of such adduct are propylene oxide-ethylene oxide adduct of ethylene-diamine, etc. By using such dispersant, aq. suspension type preparation maintaining stability at higher concn. and for longer time than conventional preparation using conventional surface active agent is obtd. as well as having superior stability even in the diluted state in the stage of spraying.

Description

[Detailed description of the invention] The present invention relates to dispersants for aqueous suspension formulations.

Traditionally, insecticides, fungicides, and weeding agents have been used as emulsions, hydrating agents, and other agricultural preparations. ! Various forms such as cloudy preparations, old preparations, powders, and granules are used depending on the type and purpose of each preparation. Among these, emulsion is 18% more effective, does not have the problem of powder scattering that is harmful to humans and animals, and is easy to handle.It has been widely used since Ruruji no San 7'C edition. . However, are there any problems with the use of organic solvents in emulsions, storage, feeding, and manufacturing? ! :I'm holding it. Therefore, in 2007, an aqueous, cloudy formulation of Kinfu that does not use organic bath additives has attracted much attention, and efforts are being focused on research into its formulation.

However, aqueous suspension preparations are subject to the problems of water content during long-term storage, sedimentation, flocculation, crystallization, caking of the dispersion agent, and water VC dispersion.

In order to solve the above problem, a method of adding a bottle agent to the formulation (JP-A-55-17301/publication), anionic surfactants such as lignin sulfone, dialkyl succinate, etc. 1
Use of raw jil J (JP-A-57-2203, JP-A-57-58601, JP-A-57-109701)
No. 1, etc.), use of nonionic surfactants (Japanese Patent Application Laid-open No. 1983-
No. 36458, Japanese Patent Application Laid-open No. 129201/1983,
(Japanese Unexamined Patent Publication No. 57-169401) The temple has been demolished.

However, in many cases, for example, the active ingredient in a paddle agent cannot be stably dispersed in water for a long period of time. It settles and cannot be used. Anionic surfactants also generally suffer from dispersibility problems during use, resulting in precipitation of the active ingredient. Comparatively better results can be obtained with non-ionic surfactants, but it is necessary to obtain a long-term stable VC dispersion of the active ingredient in water, and The dispersibility is not sufficient when using water during IJ.
This product provides a dispersant for aqueous suspension extrusions containing alkylene oxide as a main component, and has a higher image density than conventional agricultural surfactants. As a result, it is possible to obtain a 7fII manufactured by Suizaku-kata, which maintains dispersion stability for a longer period of time and has excellent dispersion stability in water #J during spraying.

Compounds having two or more amino groups in one molecule used in the present invention include ethylenediamine, propylenediamine, diethylenetriamine, triethylenetetramine,
Examples include (poly)purkylene polyamines such as pentaethylene hexacin and hexamethylene diamine, aromatic polyamines such as phenylene diamine, quanidine, piperazine, and polyethylene imine. Do these compounds react with alkylene oxide? It's harmless - it's perfectly amidated.

Particularly preferred compounds are (poly)alkylene polyamines or polyethyleneimine, polyethyleneimine having a large number of branches, especially obtained by ethyleneimine, having a molecular weight of 300 to 100,000, and especially VC60.
0 to 10,000 is preferable.

As the alkylene oxide, it is preferable to use ethylene oxide and propylene oxide, particularly a combination of ethylene oxide and propylene oxide. If necessary, butylene oxide may be used in combination.

The addition of alkylene oxide to the amino group of the above-mentioned compound having 17i or more amino M in one molecule can be carried out in an alkali medium at 50 to 150°C and 1 to 10 atm. The addition method may be either lantum or block addition, but if desired, it is preferable to first add propylene oxide (if necessary, in the case of butylene oxide) and then add ethylene oxide. Ethylene oxide addition m&yo, total alkylene oxide addition amount 30~95 zoro'JL (suyo 45~
Must be 9 o's 6.

The average molecular weight of the alkylene oxide derivative is 5000 to 30
0000 Preferably x L</x>10000 to 200000. The HLB of the obtained alkylene oxide-attached joint is 6.
If the score is 8 or more, especially if the score is 15 or more.

Akisaku Motomoto/Jul's usage certificate varies depending on biological materials, particle size, etc., but it is 0.01 to 30
It's %. It may also be used in combination with other substances, such as interfacial properties, thickeners, antifreeze agents, antifoaming agents, decomposition inhibitors, and inorganic substances.

The dispersants of the invention can be used for a variety of active ingredients. The target active ingredient is a water-insoluble or short-bath active ingredient that has been used in aqueous suspension preparations.
Ethyl-〇-(4-cyanophenyl)phenylphosphonothioate, organic phosphorus agents, 4.5.6.7-titrachlorophthalide, Na→→→4-4--￥翐tetrachloroinphthalonitrile, etc. The organic halogen agent, l-naphthyl N
- Carbamate agents such as methyl carbamate, 0-cumenyl methyl carbamate, 3.4-xylyl methyl carbamate m-tolyl methyl carbamate, 3-(3.4-
dichlorophenyl)-1,1-dimethylurea, 1-(2
-methylcyclohexyl)-3-phenylurea, 2-chloro-4,6-bis(ethylamino)-1.
3. Triazine agents such as 5-triazine, diphenyl ethers such as 2,4-cyclophenyl-P-nitrophenyl ether=p-nitrophenyl/''-2,4,6-)!I dichlorophenyl ether, 2 and pyrethrin threads etc. are exemplified.

These active substances are present in regular preparations with an amount of 5 to 80%.
It is preferably blended in an amount of 10 to 75%, and can be stably maintained for a long period of time using the dispersant of the present invention.

The dispersant of the present invention is added in an amount of 0.01 to 30%, preferably 0.05 to 20%, based on the total amount of the aqueous suspension preparation.

The dispersant of the present invention contains as a main component an alkylene/III compound with amino groups ff and 2 points upward in one molecule. All additives such as nonionic surfactants and anionic surfactants may be added.

In addition, antifoaming agents and components for improving the layering and permeability of active ingredients, such as dioctyl nurphosuccinate and lauryl resulfate, may also be added. alternating current layers
A polymer compound may be blended in advance in order to improve IT. In order to roughly inhibit freezing of the preparation, an antifreeze agent may be added.

Dispersion stability is not a change in the chemical behavior of the active substance, but rather a
It has become clear that this is influenced by the friendliness of physical and chemical properties such as wettability with water, lubricity, and specific gravity surface conditions.2. ! Therefore, in addition to the various examples mentioned above, biologically active rostrum refers to biologically active solid substances that are insoluble or poorly soluble in water, and have a molecular weight of about 1.05 to 1.85. Show what Hie planned.

The preparation can be made by softening the active ingredient using a whole mill, hammer mill, air mill, etc., and then adding it to water containing the dispersant of the present invention, or mixing the active ingredient in the form of a lump or coarse powder. After adding it to water containing the invention additive, it is wet-pulverized using a sand mill, colloid mill, imitation mill, attritor, etc., or the active J ingredient is wet-discharged with water, etc. It can be obtained by mixing in a mixer. The particle size of the active ingredient in the resulting formulation is preferably an average particle size of 0.5 to 44 microns, usually 1 to 5 microns.

Hereinafter, the present invention will be briefly described with reference to specific embodiments.

Example 12 and Comparative Example 1 38 parts by weight of 0-ethyldiphenylphosphorodithiolate, 8 parts by weight of the dispersant shown in Table 1, and 54 parts by weight of water were mixed in a sand grinder and suspended. A cloudy liquid was obtained. The average particle size of the imitation powder obtained was unified to 1μ.

Put the obtained suspension into a 250ml graduated cylinder.25
The device was placed in a constant temperature room at ℃, and the entire state of water distribution was observed. The results are shown in Table-1.

Example 2 Example 12 and Ratio 1 6 parts by weight of the dispersant used in Example 1 and 10 parts by weight of ethylene glycol were dissolved in 48 parts by weight of water.
here 1-naphthyl hemethyl force-/<j-t'ji
-3 pieces of 1μ starch crushed with Jet-O-Miser
After 6 parts were added, they were mixed in a homomixer to obtain a suspension.

The resulting suspension was allowed to stand for one month (at 25° C.) in a 250-meter cylinder, and the 50-meter sample was collected from the upper layer and mixed uniformly, after which the particle concentration was measured. Another 10-10I!
The particles were poured into water, stirred with a stick, and the state of the particles was observed after 2 hours.

Example 3 and Comparative Example 3 2-chloro-4,6-bis(ethylamino)-1,3,
5-) 35 parts by weight of riazine coarsely ground to a size of about 150μ or less using a total jet mill, 60 parts by weight of carboxymethyl cellulose 0°2 parts by weight, water containing tLr, Example 12 and Comparative Example 1 5 parts of the dispersant used in the above were placed in a sandcliner and wet-pulverized to obtain a suspension.

The resulting suspension was placed in a 300-degree wide-mouth bottle and heated to +50°C.
Heat cycled at ˜0° C. and observed the period at which water separation began.

Claims (1)

[Scope of Claims] 1. A dispersant for an aqueous suspension preparation whose main ingredient is an alkylene adduct having at least t2 amino groups in one molecule. 2. The dispersant of the first term, in which alkylene oxide is ethylene oxide and/or atomized propylene. 2. The dispersant according to claim 2, wherein 3° anocylene oxide is combined with ethylene oxide and globylene oxide, and the weight ratio of ethyl oxide/atomized globylene is 30/'70 to 9515. 4. The dispersant according to item 1, which is a porridge prepared with a chemical compound (poly)alkylene polyamine having 2f or more amino groups in one molecule. 5. The dispersant according to item 1, wherein the compound having two or more V-amino groups τ in one molecule is polyethyleneimine. 6. With alkylene oxide/JLI product average molecular type is a crime~
300,000 dispersant according to item 1.