CS248054B1 - A method for producing a stable concentrated) emulsion of a selective combined herbicidal composition - Google Patents

Abstract

The subject of the invention is a method for producing a combined selective herbicidal preparation based on three active ingredients 2- -methyl-4-chlorophenoxyacetic acid, 2- -chloro-6'-ethylamino-4-isopropylamino-1,3,5- -triazine and 2-chloro-4,6-bis-ethylamino-triazine in the form of an aqueous suspension. An aqueous suspension of 2-chloro-4-isopropylamino-6-ethylamino-1,3,5-triazine, stabilized with surfactants and polysaccharide, is added to an aqueous solution of the sodium or ammonium salt of 2-methyl-4- -chlorophenoxyacetic acid with stirring, and then finely ground active ingredient 2-chloro-4,6-bis-ethylamino-triazine is added with stirring, thereby obtaining a selective combined herbicidal preparation.

Description

The invention relates to the production of a herbicidal composition.

According to known methods and conventional production methods, the combination herbicidal composition based on 2-methyl-4-chlorophenoxyacetic acid, 2-chloro-6-ethylamino-4-isopropylamino-1,3,5-triazine and 2-chloro-4, 6-bis-ethylamino-triazine was produced by the finalization of the individual active ingredients, which were homogenized in the form of finely divided powders, after the inorganic fillers of the desired fineness were finally treated with additives and surfactants.

Finalization gave a fine powder containing a total of 50 wt. of active substances. The sorting is used in water in a spray for controlling weeds in nepol ^{1-agricultural} land, especially on railway lines, transshipment and handling areas.

A disadvantage of the method used so far is the possibility of obtaining the combined herbicidal composition only in the form of a powdered product.

We have found that a combination herbicidal preparation based on 2-methyl-4-chlorophenoxyacetic acid, 2-chloro-6-ethylamino-4-isopropylamino-1,3,5-triazine and 2-chloro-4,6-bis-ethylamino-triazine may be prepared in the form of an aqueous suspension.

The advantage of the herbicidal formulation made in the form of an aqueous suspension is good product homogeneity, good dilution of the formulation, which provides a prerequisite for uniform application of the herbicidal formulation. The aqueous suspension provides good storage conditions, simplified application handling.

The novel form of the combined herbicidal formulation comprises solid phase active ingredients which are rendered into a solution of the water-soluble active ingredient by means of surfactants and polysaccharide, forming a stable suspension form.

The advantage of the new form of the combined pesticide preparation is the possibility to use different active substances in one product. The use of the herbicidal composition thus prepared will simplify the application in agriculture, where it is possible to remove the subsequent application of the individual pesticidal compositions. The new form of the combined pssticidal formulation allows for savings in surfactants and packaging.

Selective herbicidal preparation based on 2-methyl-4-chlorophenoxyacetic acid active compounds in the form of salts, 2-chloro-6-ethylamino-4-isopropylamino-1,3,5-triazine and 2-chloro-4,6-bis-ethylamino The triazine is produced according to the invention in the form of an aqueous suspension by adding to the sodium or potassium or dimethylamine salt of 2-methyl-4-chlorophenoxyacetic acid (MCPA) containing from 12 to 30% by weight. of the active compound, add with stirring the finely divided active compound 2-chloro-4-isopropylamino-6-ethylamino-1,3,5-triazine (atrazine in an amount of 10 to 30% by weight) and further add 0.5 to 2.5 % by weight of a nonionic surfactant (Slovasol SF) representing a mixed copolymer of propylene oxide and ethylene oxide of the formula (C2H4O) _x - (C3HbO) 4- (C2H4O) _x- H wherein the polyoxypropylene chain forms the hydrophobic and polyoxyethylene chains of the hydrophilic portion of the molecule.

0.1 to 0.6 wt. a nonionic emulsifier produced by the exyetylation of higher fatty alcohols (Slovanik M 640). 5 to 11.5 wt. ethylene glycol, which provides a stabilization at temperatures below 0 ^o C.

Furthermore, 0.1 to 1.0 wt. formaldehyde, which functions as an antibacterial component.

0.1 to 5 wt. polysaccharide (Rodopol) and finely milled active ingredient 2-chloro-4,6-bis-ethylamino-triazine (Simazine in an amount of 10 to 30% by weight) is added with stirring. The mixture is ground by wet grinding, then diluted with water so that the resulting product contained 40 to 50% by weight of the active ingredients.

A selective herbicidal composition based on MCPA, atrazine and simazine prepared as described above in the form of a stable aqueous suspension. Wet milling and homogenization of the formulation ensure high fineness of the active ingredients, high suspension stability and homogeneity of the formulation. The order of addition of 2-chloro-4-isopropylamino-6-ethylamino-1,3,5-triazine and 2-chloro-4,6-bis ethylamino-triazine is optional.

We have found that the final grinding of the preparation can be omitted if all the active substances (atrazine, simazine) are before finalizing the desired fineness, i.e. the residue on the 125 μ sieve is less than 0.1%.

It is preferred to combine the grinding process with the addition of the polysaccharide and to carry out it after the addition of the active second substance.

It is also preferred to add a surfactant, emulsifier, ethylene glycol, formaldehyde and polysaccharide stabilized active ingredient to the solution of the 2-methyl-4-chlorophenoxyacetic acid salt of the species. The process may also be modified by adding to the MCPA salt solution a stable aqueous suspension containing e.g. 40 wt. of the active substance atrazine and further adding simazine.

The subject of the invention is documented. the following examples.

Example 1

A flask equipped with a stirrer and a thermometer was charged with 475 g of a solution containing 29.3% 2-methyl-4-chlorophenoxyacetic acid 2 5 5 13 5 L in the form of the dimethylamine salt. 2-chloro-4-isopropylamino-6-ethylamino-1,3,5-triazine, the suspension containing 2.5 wt. % Of Slovasol SF, 0.5 wt. Slovanik M 640

11.5% wt. % ethylene glycol and 0.5% formaldehyde were stabilized at 0.18% w / w. of Rodopol type polysaccharide such that its 1% solution had a suspension stability of 90% after 30 minutes.

Next, 280 g of finely ground powder was added with stirring, the residue on the sieve 125 / grain being 0.1%. It contained 50 wt. 2-chloro-4,6-bis-ethylamino-triazine. The resulting combination herbicidal formulation containing the three active ingredients formed a stable suspension after stirring for 20 min.

Analysis of the collected samples revealed that the final product contained 12.5 wt. % Of 2-methyl-4-chlorophenoxyacetic acid as dimethylamine salt, 12.3 wt. 2-chloro-4-isopropylamino-6-ethylamino-1,3,5-triazine and 12.6% 2-chloro-4,6-his-ethylaminotriazine. The stability of the 1% suspension was 90% after 30 minutes.

Example 2

To 350 g of an aqueous suspension containing

2.5% w / w % Of Slovasol, 0.8 wt. Slovanik, 5% w / w. of ethylene glycol and 2-chloro-4-isopropylamino-6-ethylamino-1,3,5-iriazine and, as a stabilizer of the Rodopol-type polysaccharide, successively 475 g of a solution of the dimethylamine salt of 2-methyl-4-chlorophenoxyacetic acid containing 29.2% of active ingredient. 140 g of 98% 2-chloro-4,6-bis-ethylamino-triazine as a finely divided powder was added at room temperature.

The resulting mixture was transferred to a bead bead laboratory mixer where it was stirred and gently ground for 20 min. Before completion of the homogenization and grinding process, 140 ml of water was added and homogenization was continued for 15 minutes in a laboratory mixer.

Analysis of the samples revealed 12.6% 2-methyl-4-chlorophenoxyacetic acid dimethylamine salt, 12.3% 2-chloro-4-isopropylamino-6-ethylamino-1,3,5-triazine and 12.6% 2-chlorine 4,6-bis-ethylamino-triazine. The suspension stability of the 1% suspension after 30 minutes was 89.4% and for the 5% suspension it was 78.6%.

Example 3

To 475 g of a solution containing 29.3% 2-methyl-4-chlorophenoxyacetic acid as the dimethylamine salt was added with stirring 142 g of 2-chloro-4-isopropylamino-6-ethylamino-1,3,5-triazine. Next, 9 grams of a nonionic surfactant consisting of a mixed copolymer of propylene oxide and ethylene oxide was added, followed by the addition of a non-ionic emulsifier (Slovasol SF), which represents an exetylated mixture of higher fatty alcohols.

Furthermore, 10 g of ethylene glycol and 0.15 g of polysaccharide were added to 210 g of water with stirring, and the resulting solution was added to the finalizing active ingredients. 0.5 ml of formaldehyde and 140 g of 2-chloro-4,6-bis-ethylamino-triazine were added before milling. The resulting mixture was ground by wet grinding; further, a sample was taken for analysis of the active substance content and diluted with water. After dilution, the mixture was homogenized for 30 minutes. Analysis showed a suspension stability of 1% 90.3% solution for 30 minutes.

Claims (3)

of the acid in the form of a dimethylamine salt, followed by the addition of 350 g of an aqueous solution containing 40 wt. 2-chloro-4-isopropylamino-6-ethylamino-1,3,5-triazine, wherein the suspension contained 2.5% by weight of SF, 0.5% by weight. Slovanik M 640, 11.5 wt. ethylene glycol and 0.5% formaldehyde, was stabilized with 0.18% by weight of Rodopol type polysaccharide so that the 1% / solid solution had a suspension stability of 90% after 30 minutes. Further, 280 g of a finely divided powder, whose residues on the 125 µm mesh were 0.1%, were added with stirring. It contained 50% by weight of 2-chloro-4,6-bis-ethylamino-triazine. The combined herbicidal formulation containing the three active ingredients formed a stable suspension after 20 minutes of mixing. Analysis of the collected samples revealed that the resulting product contained 12.5% by weight of 2-methyl-4-chlorophenoxyacetic acid in the dimethylamine salt form, 12.3% by weight of 2-chloro-4-isopropylamino-6-ethylamino-1,3,5- triazine and 12.6% 2-chloro-4,6-ibis-ethylamino triazine. The stability of the 1% suspension was 90% after 30 minutes. Example 2 To 350 g of an aqueous suspension containing 2.5 wt. Slovasol, 0.8 wt. Slovak, 5 ° / w. of ethylene glycol and 2-chloro-4-isopropylamino-6-ethylamino-1,3,5-triazine, and as a Rodopol polysaccharide stabilizer, a gradual 475 solution of the dimethylamine] salt of 2-methyl-4-chlorophenoxyacetic acid, containing 29.2% of the active ingredient. At room temperature, 140 g of 98% 2-chloro-4,6-bis-ethyl-amino-triazine was added as a finely divided powder. The resulting mixture was transferred to a laboratory bead blender mixer where it was stirred for 20 min and gently milled. Before the end of the grinding homogenization process, 140 ml of water was added and continued for 15 minutes in homogenization in a laboratory mixer. By analyzing the samples taken, 12.6% of 2-methyl-4-chlorophenoxyacetic acid dimethylamine salt, 12.3% 2-chloro-4-isopropylamino-6-ethylamino-1,3,5-triazine and 12 6% 2-chloro-4,6-bis-ethylamino-triazine. The suspension stability of the 1% suspension was 89.4% for 30 minutes and 78.6% for the 5% suspension. Example 3 142 g of 2-chloro-4-isopropylamino-6-ethylamino-1,3,5-triazine were added to 475 g of a solution containing 29.3% of 2-methyl-4-chlorophenoxyacetic acid in a dimethylamine salt with stirring. Further, 9 grams of a nonionic surfactant formed by a mixed propylene oxide / ethylene oxide copolymer was added, and after mixing, a nonionic emulsifier (Slovasol SF) was added, which is an exyethylated mixture of higher fatty alcohols. Further, 10 g of ethylene glycol and 0.15 g of polysaccharide were added to 210 g of water with stirring, and the resulting solution was added to the final active ingredients. Before grinding, 0.5 ml of formaldehyde and 140 g of 2-chloro-4,6-bis-ethylamino-triazine were added. The resulting mixture was wet-milled; a sample for further analysis of the active substance content and diluted with water. After dilution, the mixture was homogenized for 30 minutes. Analysis showed a suspension stability of a 1% solution of 90.3% over 30 minutes. PEEDMET A process for producing a stable concentrated suspension of a selective combined hebicidal composition comprising 2-methyl-4-chlorophenoxyacetic acid in the form of salt, 2-chloro-6-ethylamino-4-isopropylamino-1,3,5-triazine and 2-chloro Characterized in that a solution of 2-methyl-4-chloro-phenoxyacetic acid containing 12 to 30 wt. with stirring, finely divided 2-chloro-4-isopropylamino-6-ethylamino-1,3,5-triazine is added in an amount of 10 to 30 wt. 0.5 to 2.5 ° / watt. a nonionic surfactant representing a copolymer of propylene oxide and ethylene oxide, 0.1 to 0.6 wt. a nonionic emulsifier produced by exyethylation of a higher alcohol content, 5 to 11.5 wt. % ethylene glycol, 0.1 to 1.0 wt. % of the formaldehyde of the invention, 0.1 to 5 wt. polysaccharide and mixing, finely milled 2-chloro-4,6-bis-ethylamino triazine is added in an amount of 10 to 30% by weight. and the mixture is wet-milled, finally diluted with water so that the resulting product contains 40-50% by weight. and to homogenize. 2. Process according to claim 1, characterized in that the milling process is preferably combined with the addition of a polysaccharide and is carried out after the addition of the second active ingredient. 3. Process according to claim 1, characterized in that a second active substance stabilized with a surfactant, emulsifier, ethylene glycol, formaldehyde and polysaccharide is added to the solution of 2-methyl-4-chloro-phenoxyacetic acid salt.