CS237107B1 - A method for preparing a selective herbicidal composition based on 2-chloro-4-ethylamino-6-isopropylamino-1,3,5-triazine - Google Patents

Abstract

The subject of the invention is to prepare a selective herbicide preparation based on 2-chloro-4-ethylamino-6-isopropylamino-1,3,5-triazine by finalizing finely ground technical 2-chloro-4-ethylamino-6-isopropylamino-1,3,5-triazine, a dry dispersant, remaining from kaolin and a nonionic surfactant on base of a mixed copolymer of propylene oxide and ethylene oxide. Next, sulfite leachate, kaolin is added, and after mixing, a wetting agent is added and the mixture is further mixed, obtaining a preparation with an active substance content of 50 to 95% by weight, with a high suspension stability of up to 90% and a high grinding fineness, characterized by a maximum of 0.1 percent residues on a 125 μΐη sieve.

Description

According to the present invention, a selective herbicidal preparation based on 2-chloro-4-ethylamino-6-isopropylamino-1,3,5-triazine is prepared by finalizing a finely ground technical 2-chloro-4-ethylamino-6-isopropylamino-1,3,5-triazine. -triazine, a dry dispersant consisting of kaolin and a nonionic surfactant based on a mixed copolymer of propylene oxide and ethylene oxide. Sulfite liquor, kaolin are then added and, after mixing, a wetting agent is added and the mixture is further mixed to obtain a preparation with an active ingredient content of 50 to 95% by weight, with a high susceptible stability up to 90% and a high milling fineness characterized by max. 0.1 percent residue on the sieve 125 μΐη.

SUMMARY OF THE INVENTION The present invention provides a process for the preparation of a selective herbicidal formulation based on 2-chloro-4-ethylamino-6-isopropylamino-1,3,5-triazine by finalization in powder form with an active compound content of from 50 to 95% by weight, high a suspension stability of 1% w / w solution from 75 to 90% with a high fineness of grinding, characterized by a max. 0.1% sieve residue 125 μΐη.

According to the known processes and conventional process, the selective herbicidal preparation based on 2-chloro-4-ethylamino-6-isopropylamino-1,3,5-triazine is finalized to form a dispersible wettable powder, generally containing 50% by weight. 2-chloro-4-ethylamino-6-isopropylamino-l, 3,5-triazine. It is finalized using the technical active ingredient with the addition of fillers, emulsifiers, sulphite liquor, dry dispersant and wetting agents. The mixture thus prepared is homogenized to obtain a selective herbicidal formulation containing up to 50% by weight of the composition. of the active substance. It is used as a spray selective herbicide in an aqueous suspension for weed control.

A disadvantage of the conventional production process is the low content of active substance in the final product, which is generally 50% by weight. Previously known finishing processes have not achieved simultaneously a high active ingredient content of from 50 to 95% by weight, while at the same time a high milling fineness and high sunspension stability of the selective herbicidal formulation.

It has been found that the process for preparing a selective 2-chloro-4-ethylamino-6-isopropylamino-1,3,5-triazine-based herbicidal preparation can be accomplished by finalizing the active ingredient in powder form, containing 50-95% w / w, with high suspension stability of 1% solution from 75 to 90% as well as high grinding fineness, characterized by max. 0.1% residues on the sieve 125, μπι, increasing the effectiveness of the selective herbicidal product.

According to the invention, a selective herbicidal preparation based on 2-chloro-4-ethylamino-6-isopropylamino-1,3,5-triazine is prepared by adding to 50 to 85 parts by weight of finely ground technical 2-chloro-4-ethylamino-6. Isopropylamino-1,3,5-triazine adds, with stirring, 2 to 10 parts by weight of a dry dispersant consisting of 80% kaolin and 20% of a nonionic surfactant based on a mixed copolymer of propylene oxide and ethylene oxide.

Furthermore, 1.0 to 10 parts by weight of a sulphite liquor are added under stirring. 1-34 parts of kaolin are added and then the mixture is stirred for 5 to 60 minutes. Finally, 0.5 to 2 parts by weight of wetting agent are added under stirring to obtain a selective herbicidal composition with new qualitative parameters, namely a high suspension stability of a 1% 75-90% solution and a high grinding fineness, characterized by a max. 0.1% residue on the sieve 125 μΐη and with good wettability.

The subject matter of the invention is illustrated by examples, which, however, do not limit its scope.

Example 1

470 g of technical 2-chloro-4-ethylamino-6-isopropylamino-1,3,5-triazole containing 92.25% by weight of the mixture were metered into a laboratory mixer. atrazine as determined by gas chromatography, the active substance being finely ground to a sieve residue of 0.04 mm 0.55% w / w; and the 0.125 mm sieve residue was 0.07 wt. Next, 55 g of finely ground sulphite liquor and 15 g of dry dispersant were metered into the mixer.

The mixture was stirred for 5 to 20 minutes, then 10 grams of a wetting agent representing a branched-chain alcohol solution, ketoalcohols, ether alcohols and a chain length of Ca to C18 were added (mixture), then the mixture was stirred for 5 to 60 minutes. A formulation containing 78.96 wt. % 2-chloro-4-ethylamino-6-isopropylamino-1,3,5-triazine, 0.35 wt. NaCl, the wettability of the formulation was 29 sec, the suspension stability of the 1% solution was 83.15 wt%, the residue on the 0.04 mm sieve was 0.53 wt%. and on a 0.125 mm screen was 0.08 wt.

Example 2

For a comparison of the conventional process for the production of a selective herbicidal composition containing 50% by wt. of the active ingredient and the proposed process according to the invention, a lacratory finalization was carried out which corresponds to the conventional production method.

462 g of technical 2-chloro-4-ethylamino-6-isopropylamino-1,3,5-triazine, containing 92.38% by weight, were weighed into a laboratory mixer. % of the active substance is determined by gas chromatography, 0.35 wt. NaCl, the active ingredient being ground beforehand and the sieve residue 0.04 mm was 0.46% by weight. and on a 0.125 sieve the residue was 0.07 percent by weight. The mixer is further dosed ¹ 17 g of dry reground dispersant, 85 g of sulphite lye and 289 g of kaolin. Analysis showed 49.6% active ingredient, suspension stability was 75.65% w / w, wettability 57 and sieve residue 0.04 mm were 1.20% w / w. and, on a 0.25 mm sieve, was 0.06 wt.

Comparing Examples 1 and 2, the process of the invention provides an increase in the active ingredient content of the final product, an increase in the suspension stability of the formulation while providing a high fineness.

Example 3

The experiment was carried out as in Example 1 using a modified dispersant consisting of 30 wt.% Instead of a wetting agent (10 g). % kaolin and 20 wt. representing a branched alcohol sulphate solution. A formulation was obtained which contained 80.20 percent by weight. 2-chloro-4-ethylamino-6-isopropylamino-1,3,5-triazine had an aqueous suspension stability of 85.66% by weight, a sieve residue of 0.04 mm was 0.96% and a sieve residue of 0.125 mm was 0.07% by weight.

Claims (2)

SUBJECT Process for the preparation of a selective herbicidal preparation based on 2-chloro-4-ethylamino-6-isopropylamino-1,3,5-triazine by finalization in powder form with an active substance content of 50 to 95% by weight, with a high suspension stability of 1% solution from 75 to 90% by high grinding fineness, characterized by sieve residues 125 µm max. 0.1 percent, characterized in that up to 50 to 85 wt. parts of finely ground technical 2-chloro-4-ethylamino-6-isopropylamino-1,3,5-triazine are added with stirring from 2 to 10 wt. BACKGROUND OF THE INVENTION parts of a dry dispersant consisting of 80% kaolin and a 20 o / _o nonionic surfactant based on a mixed copolymer of propylene oxide and ethylene oxide and further adding 1.0 to 10 parts by weight of a sulphite liquor with stirring and 1 to 34 parts of kaolin then added The mixture is stirred for 5 to 60 minutes, 0.5 to 2.0 wt. parts of the wetting agent and the mixture is further mixed. 2. A method according to claim 1, characterized in that the dry dispersant is treated with a wetting agent.