CS249867B1 - Combined herbicidal preparation - Google Patents

Abstract

The solution relates to a combined herbicide preparation based on the active substances 2-methyl-4-chlorophenoxyacetic acid (MCPA) and 2-chloro-6-ethylamino-4-isopropylamino-1,3.5-triazine. The preparation is finalized in the form of a stable aqueous suspension, with one active substance being in solid form, which is suspended in a solution of a water-soluble first active substance by means of surfactants, polysaccharide obtained by culturing Xanthomonas microorganisms and stabilizing components.

Description

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BACKGROUND OF THE INVENTION The present invention relates to a combined herbicidal preparation based on the active ingredients 2-methyl-4-chlorophenoxyacetic acids in the form of salts and 2-chloro-4-ethylamino-4-isopropylamino-1,3,5-triazine in a form of water sus-pension.

According to the known methods and the method of production used, 2-methylphenoxy-acetic acid (MCPA) is formulated as a sodium, potassium or dimethylamine salt dissolved in the water in the form of a herbicidal composition. These solutions are used selectively as herbicidal preparations for controlling dicotyledonous weeds in cereals. 2-Chloro-6-ethylamino-4-isopropylamino-1,3,5-triazine (atrazine) is, according to known procedures, finalized in the form of a wettable powder which is used as a selective herbicide for controlling weeds. A process is known in which atrazine is finalized by the formulations of an aqueous suspension containing the active compound 2-chloro-4-isopropylamino-6-ethyl-amino-1,3,5-triazine.

It has now been found that it is possible to produce a combined herbicidal formulation of MCPA and atrazine in the form of an aqueous sus-pension. The advantage of the herbicidal formulation prepared in the form of an aqueous suspension is the good homogeneity of the product, the good dilution of the composition which gives rise to the uniform application of the herbicidal composition.

The aqueous suspension creates good conditions for the shelf life of the formulation as well as simplified handling in the application.

The novel form of the combined herbicidal composition contains the active ingredient atrazine in a solid form, which is suspended in a solution of water-soluble active substance by means of surfactants, polysaccharides and stabilizing components, to form a stable suspension form. The combined herbicidal composition simplifies application in agriculture, since by its single use, the active ingredients are applied, which has so far been required to be self-contained! administration of both MCPA and atrazine.

The combined herbicidal preparation based on the active substances of 2-methyl-4-chlorophenoxyacetic acid in the form of the salt of 2-chloro-4-isopropylamino-6-ethylamino-1,3,5-triazine can be prepared in the form of water. for example, by adding to the sodium or potassium or dimethylamine salt of MCPA containing 10 to 30% w / w MCPA, a finely divided active ingredient of 2-chloro-4-isopropylamino-6-ethyl-amino-1,3, with stirring; 5-triazine (atrazine) at 10-30% wt. and further adding 0.3 to 5% by weight of a surfactant from the group of a nonionic surfactant, e.g. Slovazol SF, which is a mixed copolymer of propylene oxide and ethylene oxide in which the polyoxypropylene chain forms a hydrophobic and polyoxyethylene new chain hydrophilic part of the molecule. 0.1 to 1.0 wt. a nonionic emulsifier, e.g., Slovanik M 640, which is produced by oxetylation of higher fatty alcohols. It adds 5 to 10% by weight to the finalizing agent. ethylene glycol, which stabilizes it at temperatures below 5 ° C. Next, 0.1 to 1% formaldehyde, which functions as an anti-bacterial component, is added to the finalizing composition with stirring. During vigorous stirring, the polysaccharide obtained by culturing the Xanthomoes microorganisms or an aqueous solution thereof such as Ro-dopol is added. The mixture is ground by wet milling, the dilution is diluted with water so that the resulting product contains 33 to 55% by weight. active substances. It is further homogenized. Moisturizing and homogenizing the preparation! high fineness of the active ingredients, high suspension stability and homogeneity of the formulation.

It has been found that the final milling of the preparation can be omitted if the atrazine is before the desired fineness, i.e. the residue on the sieve 125 is less than 0.1 ° / o.

It is preferred to add the polysaccharide or its aqueous solution after the mill mill.

The process can also be modified by adding a stable aqueous suspension containing 40% by weight of the active substance atrazine with stirring to the MCPA salt solution.

The present invention is illustrated by the following examples: Example 1

To the flask was charged 475 g of a solution containing 29.3% 2-methyl-4-chlorophenoxyacetic acid in the form of dimethylamine salt and 180 g of 2-chloro-4-isopropylamino-6-ethylamino-1,3,5 was added with stirring. -triazine. Next, 1 9 g of Slovazol SF was added, and 3.2 g of Slovanik M640 were added. While stirring at room temperature, an aqueous solution consisting of 210 g of 10 g of ethylene glycol and 0.2 g of polysaccharide obtained by culturing the Xanthomonas microorganisms was added with 0.5 ml of formaldehyde. ml and homogeneously stirred for 20 minutes. Analysis showed a suspension stability of 1% solution, which was 90.3%. Example 2

475 g of a solution containing 29.8% of 2-methyl-4-chlorophenoxyacetic acid in the form of dimethylamine salt were metered into a flask equipped with a stirrer and a thermometer, and 350 g of an aqueous suspension containing 40% was added with stirring. % wt. 2-chloro-4-isopropylamino-6-ethylamino-1,3,5-triazine, while the suspension contained 2.5% by weight of SF, 0.5% of Slavic acid M 640 and 5% of ethylene glycol and 0.5% of ethylene glycol. O / o formaldehyde, bolastabilized with 0.2 ° / polysaccharide obtained by culturing Xanthomo-

Claims (4)

SUBJECT A combination herbicidal composition comprising: 10 to 30 ° / wt. 2-methyl-4-chloro-phenoxyacetic acid in the form of salts in aqueous solutions, 10 to 30 wt. 2-chloro-4-isopropylamino-6-ethylamino-1,3,5-triazine, 0.3 to 5 wt. a surfactant from the nonionic surfactant group which is a mixed copolymer of propylene oxide and ethylene oxide, 0.1 to 1.0 wt. a nonionic emulsifier made by oxethylating higher fatty alcohols 5 to 10 wt. ethylene glycol 0.1 to 1 wt. formaldehyde 0.1 to 0.2 wt. polysaccharide obtained by cultivating Xanthomonas microorganisms, the remainder being water such that the resulting product contains 33-55 wt. of active substances.