JPS6337761B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a novel formulation form of a composite herbicide, and more particularly to a water-suspended formulation of a water-soluble herbicidal component and a sparingly soluble herbicidal component.

Water-soluble herbicidal ingredients are usually formulated as water-solvents,
On the other hand, poorly soluble solid herbicidal ingredients are usually powders, wettable powders,
It is formulated into emulsions, etc. When it is desirable to apply these types of substances simultaneously, it is common practice to mix them at the time of preparing the spray liquid by so-called garden mixing, but sometimes a good suspension state cannot be obtained or the preparation of the spray liquid is difficult. It often does not remain stable from the time the spraying is completed until the end of the spraying process.

In addition, although it is possible to make a composite preparation in advance in the form of a powder, wettable powder, granule, etc., there are safety concerns during the preparation process or when handling powdered products, especially when water-soluble ingredients are poisonous or deleterious substances. The above problems tend to occur, and a concentrated liquid type composite preparation has been desired.

(1) When a poorly soluble solid component is finely pulverized and dispersed in a concentrated solution of a water-soluble component, a stable suspension can be obtained at high concentration over a long period of time by selecting an appropriate surfactant as a dispersant. (2) In the case of mixed application of herbicides, two or more active ingredients are applied, one to the above-ground parts of the plant or seeds on the surface, and the other to the underground parts of the plant or to the seeds. As a result of mainly acting on seeds underground, or having one acting quickly and the other slowly, they often bring about superior effects that cannot be seen when used alone, but as mentioned above, The formulated composite herbicide is based on the findings that the benefits of mixed application can be maximized.

The present invention is a water-suspended composite herbicide in which a poorly soluble solid herbicidal component is dispersed and suspended in an aqueous solution containing a water-soluble herbicidal component at a concentration of 10% or more in the presence of a surfactant.

The water-soluble herbicidal component used in this preparation has a solubility in water of 10% or more. For example, 1,
1'-dimethyl-4,4'-bipyridium dichloride, 1,1'-ethylene-2,2'-bipyridium dibromide, potassium 4-amino-3,5,6-trichloro-2-pyridinecarboxylate , ammonium sulfamate, sodium 2,2,3,3-tetrafluoropropionate, sodium N'-methoxycarbonylsulfanilamide, 2,
Sodium 2-dichloropropionate, sodium pentachlorophenol monohydrate, sodium 2-methyl-4-chlorophenoxyacetate, potassium 2-methyl-4-chlorophenoxyacetate, 2,
Examples include sodium 4-dichlorophenoxyacetate monohydrate, sodium chlorate, and sodium cyanate. These are preferably prepared in advance into an aqueous solution with a concentration of 10% or more and used as a dispersion medium for the poorly soluble solid herbicidal component described below. Of course, part or all of the water-soluble components may be dissolved after the poorly soluble solid components are dispersed.

Next, a poorly soluble solid herbicidal component is dispersed in this aqueous solution or water. Slightly soluble solid herbicidal ingredients include those that are poorly soluble or insoluble in water, such as 2-chloro-4,6-bi(ethylamino)-s-triazine, 3-(3,4-dichlorophenyl)- 1,1-
Dimethylurea, 2,4-dichlorophenyl-3
-methoxy-4-nitrophenyl ether, 2,
4,6-trichlorophenyl-4-nitrophenyl ether, 2,4-dichlorophenyl-4-nitrophenyl ether, 3-isopropyl-2,
1,3-Benzothiadiazin-(4)-one-2,2
-dioxide, 1-(α,α-dimethylbenzyl)
-3-(paratolyl)urea, 5-tert-butyl-3-(2,4-dichloro-5-isopropoxyphenyl)-1,3,4-oxadiazolin-2-one, 4-( methylsulfonyl)-2,6
-dinitro-N,N-dipropylaniline, 3-
(3,4-dichlorophenyl)-1-methoxy-1
-methylurea, 5-promo-3-sec-butyl-6-methyluracil, and the like. In order to maintain a good suspended state of poorly soluble solid components for a long period of time, it is necessary to keep the particles fine with an average particle size of 1 μm or less. Dispersion is preferably carried out by wet grinding in the medium using a ball mill or the like. It is advantageous to form a suspension with a solid concentration of at least 10% or higher, and from this point of view, the sparingly soluble solid constant component is pulverized extremely finely using a jet-o-mizer, etc. It is recommended to disperse it in the medium using a homogenizer or the like.

Addition of a suitable surfactant is essential for good dispersion of solid particles and their stability. The selection of surfactant is important, but the type of herbicidal ingredient,
It depends on the composition of the entire preparation, and in reality, a suitable one must be selected through trial and error experiments.

Examples of the surfactant used in the present invention include sodium lignin sulfonate, sodium alkylallyl sulfonate, sodium dialkyl sulfosuccinate, polyoxyethylene alkyl allyl ether sulfate, polyoxyethylene alkyl ether sulfate, and alkylnaphthalene sulfonate. Select from anionic surfactants such as sodium, nonionic surfactants such as polyoxyethylene alkyl allyl ether, polyoxyethylene alkyl ether, polyoxyethylene fatty acid ester, sorbitan monooleate, polyoxyethylene sorbitan monolaurate, etc. It can be done. It is usually best to use two or more types in combination. A surfactant selected from various types of surfactants is used in an amount of 5% or more based on the water in the composition, and is added during or before or after the wet pulverization or dry pulverization powder dispersion step.

The general composition of the composite herbicidal preparation obtained in this way is 8 to 30% water-soluble herbicidal ingredients, 8 to 30% poorly soluble herbicidal ingredients, 3 to 20% surfactant, and 30 to 80% water. There is no hindrance to adding various auxiliary agents in addition to this depending on the situation. Even if this product is stored for a long period of time, the suspended particles are unlikely to become coarse as is often seen in ordinary suspensions, and a stable suspension state can be maintained. If the herbicidal component is less than the above range, the benefits of a highly concentrated formulation will not be obtained, and if the surfactant is less than the above range, a stable suspension will not be obtained and the desired storage stability will not be achieved. On the other hand, if the herbicidal component or surfactant is in an amount exceeding the above range, the aqueous component may not be sufficiently dissolved or the viscosity of the composition may increase, making it difficult to handle, which is not preferable.

This preparation can be used as is or diluted with a small amount of water.
Suitable for making high concentration spray liquid for small amount spraying. Of course, it can also be diluted with a large amount of water and sprayed like a normal liquid or emulsion, and the diluted solution also shows a good and stable dispersion state.

Example 1 Two particles were pulverized in advance to an average particle size of 1μ or less using a jet-o-mizer (manufactured by Seishin Enterprises).
-Chloro-4,6-bi(ethylamino)-s-triazine 20 g, 44.6% aqueous solution of 1,1'-dimethyl-4,4' bipyridium chloride, 46 g, AC-
3078 (surfactant, manufactured by Toho Chemical Industry) 10g and water
Put 124g into container 1 and stir for 20 minutes with a universal homogenizer HED2 model (manufactured by Nippon Seiki).
Mixing was carried out to obtain 200 g of the composite herbicidal preparation of the present invention.

After being left at room temperature for 6 months, a transparent layer formed on the upper layer and sedimentation of suspended particles was observed.
When lightly shaken, it was easily redispersed, and no agglomeration of the precipitate was observed. In addition, disperse 2 ml of this preparation in 100 ml of water at 20°C and put it in a graduated cylinder.
Although it was left in a constant temperature room at 20°C for 2 hours, no change was observed in the suspended state.

Example 2 2-chloro-4,6-(ethylamino)-s- was pulverized in advance to an average particle size of 1μ or less using a supersonic jet pulverizer (manufactured by Nippon Neumatic Kogyo).
20 g of triazine, 46 g of 44.6% aqueous solution of 1,1'-dimethyl-4,4'-bipyridium chloride, 20 g of Sorbol 3032 (surfactant, manufactured by Toho Chemical Industries) and 114 g of water were mixed in the same manner as in Example 1 above. death,
200 g of the composite herbicidal preparation of the present invention was obtained.

Example 3 230 g of 1,1 dimethyl-4,4'-bipyridium dichloride 44.6% aqueous solution, 2-chloro-4,6
-bi(ethylamino)-s-triazine 100g, Solpol 3032 (surfactant, manufactured by Toho Chemical Industry) 100g
g and 620 g of water were placed in two containers, 1 kg of glass beads were added, and the mixture was ground and mixed using a sand grinder. The glass beads were separated to obtain 1 kg of the composite herbicide of the present invention.

Example 4 460 g of 44.6% aqueous solution of 1,1-dimethyl-4,4'-bipyridium dichloride, 200 g of 3-(3,4-dichlorophenyl)-1,1'-dimethylurea,
Mix 50 g of AC-3078 (surfactant, manufactured by Toho Chemical Industries) and 290 g of water in the same manner as in Example 3,
1 kg of the composite herbicidal preparation of the present invention was obtained.

Claims (1)

[Claims] 1. A water-suspended composite herbicidal formulation in which a sparingly soluble solid herbicidal ingredient is dispersed and suspended in an aqueous solution with a concentration of 10% or more of the water-soluble herbicidal ingredient in the presence of a surfactant.