CS248472B1 - Combined herbicide - Google Patents

Abstract

Dispersible herbicide concentrate containing 10 to 30% by mass. 2-methyl-4-chlorophenoxyacetic acid, 10 to 30% by weight. 2-methyl-4-tert.butylamino-6-ethylamino-S--triazine, 0.8 to 3.5 wt.% polysaccharide, 0.2 to 1.2 wt. of formaldehyde and 0.1 to 5% by mass. nonionic emulsifier. The used polysaccharide is obtained by cultivating microorganisms of the Xanthomonas family.

Description

248472

BACKGROUND OF THE INVENTION The present invention relates to a combined herbicidal preparation based on 2-methyl-4-chloro-phenoxy-acetic acid (MCPA) and 2-methyl-thio-4-tert-butylamino-6-ethylamino-S-triazine as a dispersible cone. of the concentrate.

According to a known and well-known method of manufacture, the combined herbicidal composition based on 2-methyl-4-chlorophenoxyacetic acid (MCPA) and 2-methyl-4-tert-butyl-amino-6-ethylamino-S-triazine ( The active ingredients are finalized in the form of fine powders together with solid fillers in admixture with the surfactants, and in agriculture, the dispersible powders thus produced are mixed with water to form a suspension.

The disadvantage of the process used to date is the handling of pesticide dusts alone. A further disadvantage is that in the case of the necessity of applying two different active substances, which require different application of the individual preparations in different stages.

The combined 2-methyl-4-chlorophenoxyacetic acid (MCPA) and terbutrine combined herbicidal composition is used for destruction of burbin in winter wheat without sowing.

They found that the combined MCPA herbicide and terbutrine could be prepared in the form of a dispersible concentrate.

The novel form of the combined herbicide composition is characterized in that the formulation comprises the solid-phase active ingredient by means of surfactants, polysaccharide and dimethylformamide treated with an aqueous solution of the water-soluble active substance. A stable aqueous suspension is formed containing two active ingredients, one of which is soluble. in water and species stably suspended

The present invention provides a combined herbicidal composition comprising 2-methylphenoxy-acetic acid and 2-methyl-4-tert-butylamino-6-ethylamino-S-triazine. In its production, it can start from an aqueous solution of the sodium, potassium or dimethylamine salt of 2-methyl-4-chlorophenoxyacetic acid. For example, a finely divided active ingredient of 2-methyl-4-tert-butylamino-6-ethylamino-S-triazine is added to the 12-30% aqueous solution while stirring, and the surfactants, nonionic emulsifier groups, are added. The amount of finely divided active ingredient is selected such that the final product contains 5 to 25 wt. terbutrin. After mixing, the resulting mixture may be wet milled to obtain the desired fineness, since the solid substance is sufficiently milled in the solid phase, it is sufficient to add stabilizing components to the resulting suspension, namely polysaccharide in an amount of 0.2 to 2.5% by weight. and 0.2 to 1.2 wt. formaldehyde-related final product. Upon completion of the finalization, the slurry is diluted with water and wet milled to ensure homogenization of the product. The product is homogenized by stirring for 20 to 50 minutes. The process can be modified by adding a dispersible powder terbutyrine containing max. 20% fillers and containing an emulsifier to the MCPA salt solution. The next production process remains unchanged.

If all the finalization components are desired fineness, the grinding process can be left out. it is preferable to pre-dissolve the polysaccharide into formaldehyde and add to the mixture with or before grinding with stirring.

The combined herbicidal formulation in the form of a dispersible concentrate according to the invention contains 10 to 30 wt. 2-methyl-4-chlorophenoxyacetic acid in the form of inorganic or organic salts, 10 to 30% by weight of 2-methyl-4-tert-butylamino-6-ethylamino-S-triazine, 0.8 to 3.5% by weight of polysaccharide obtained by culturing the xan-thomonas microorganism, 0.2 to 1.2 wt. % of formaldehyde, 0.1 to 5.0 wt. surfactants from the group of non-ionic emulsifiers, 1-12 wt. ethylene glycol. Example 1

226.6 ml of a 29.26% dilute MCPA solution in the form of a dimethylamine salt were metered into a three-necked flask equipped with a thermometer and 184 g of finely ground powder containing 147.2 g of 2-methylthio-4-butylamino was added with stirring. -6-ethylamino-S-triazine, the remainder being fillers and 3 wt. emulsifiers. The resulting suspension was stabilized with 5.0 g of polysaccharide (Rodopol is a structural substance, letero-polysaccharide, is a fermentation product of Xantho-monas.) And 2 g of formaldehyde. Next, 240 ml of water was added. The suspension was stirred for 25 minutes, then the bulk was transferred quantitatively. a wet milling machine, where it was wet-milled for 5 minutes. The stable aqueous suspension contained both the desired amount of 2-methyl-4-chlorophenoxy-acetic acid and 2-methyl-4-tert-butyl-6-ethyl-amino-S-triazine, with a 1% solution having a stability of 89.95%. Example 2

66.3 mg of 2-methyl-4-chloro-phenoxyacetic acid in the form of dimethylamine solution was charged into a flask equipped with a stirrer and a thermometer. To 20 ml of water was added 5 g of Rodopol and 2 g of formaldehyde. After stirring, the solution was added with stirring to an aqueous solution of dimethylamine salt of 2-methyl-4-chlorothenoxyacetic acid. Further, with stirring, aqueous non-stabilized suspension prepared by mixing finely milled 145 g of 2-methylthio-4-tert-butylamino-6-ethylamino-S-triazine and 220 ml of water was added.

Claims (1)

Combined herbicidal preparation in the form of a dispersible concentrate, characterized in that it contains 10 to 30% by weight of 2-methyl-4-chlorophenoxyacetic acid in the form of inorganic or organic salts, 10 to 30% by weight of 2-methyl-4-tert-butylamino-6-ethylamino- S-triazine, 0.8 inventions up to 3.5% by weight of polysaccharide obtained by culturing microorganisms of the genus Xanthomonas, 0.2 to 1.2% by weight of formaldehyde and 0.1 to 5% by weight of surfactants from the group of non-ionic emulsifiers.