RU2600756C1 - Method for producing working liquid of herbicide agent - Google Patents

Abstract

FIELD: agriculture.

SUBSTANCE: invention relates to agriculture and can be used to fight weeds and undesirable plants in agricultural crops. Working liquid of the herbicide agent is obtained directly before the use by reacting a herbicidally effective amount of N-phosphon methyl glycine, or 2,4-dichlorophenoxyacetic acid or 2-methoxy-3,6-dichlorobenzoic acid, or 3,6-dichloropyridine-carbonic acid with trialkylamine containing one alkyl radical with not less than 8 carbon atoms, herewith taken in equimolar or excess molar amount with respect to the herbicide active substance, in an aqueous medium. Herewith the excess molar amount of the trialkylamine containing one alkyl radical with not less than 8 carbon atoms is not more than 10 % of the molar amount of the herbicide active substance. Before adding the herbicide active substance previously obtained is trialkylamine emulsion in water.

EFFECT: invention simplifies the process.

1 cl, 3 tbl

Description

This invention relates to agriculture and can be used to control weeds and undesirable vegetation in crops of crops using herbicidal preparations, the active substance (hereinafter - AI) which has surface-active properties.

Modifications of N-phosphonomethylglycine (hereinafter referred to as glyphosate), 2,4-dichlorophenoxyacetic acid (hereinafter referred to as 2,4-D acid), and 2-methoxy-3,6-di-chlorobenzoic acid (hereinafter known) are known to have surface-active properties. - dicamba), 3,6-dichloropyridine carboxylic acid (hereinafter - clopyralide) in the form of a trialkylamine (hereinafter - TAA) salt, in which one alkyl radical contains at least 8 carbon atoms (RU 2356229, publ. 27.05.2009, RU 2384064, publ. March 20, 2010, RU 2408188, published January 10, 2011, RU 2523493, published July 20, 2014), which have greater biological activity than their tradition ionic analogues.

It is generally accepted that the preparation of working fluids for pesticide preparations for spraying is based on mixing the calculated amount of the drug with water in the sprayer tank (List of pesticides and agrochemicals approved for use in the Russian Federation, M., 2011.), i.e. a prerequisite for obtaining the working fluid is the presence of the drug itself or the same technological stage of production of the pesticidal preparation.

Usually, depending on the composition of the drug, the share of processing in the final price of the drug takes from 10 to 30%. This fact, along with biological effectiveness, is very tangible from the point of view of the economy of protecting crops from weeds and the exclusion of the stage of production of the drug from the technological chain of preparation of the working fluid for spraying is certainly important from the point of view of reducing financial costs.

However, for traditional AI herbicides and their modifications that do not have surface-active properties, this is not possible, since the quality of the working fluid is determined not only by the presence of a.v. herbicide, but also the presence in it of a set of auxiliary components (surfactant, solvent, etc.). At the same time, for modifications of the AI herbicides with surface-active properties, such as TAA salts of glyphosate, dicamba, 2,4-D acid and clopyralide, this is quite possible, since having bifunctional properties (surface and biological activity) their working solutions do not require the presence of an additional amount of surface -active substances, no solvent, or other ingredients, which provides the fundamental possibility of exclusion from the general technological chain of production and use of such herbicidal preparations stage synthetic surfactant modifications d. c. herbicide and formulation of the drug.

Due to the fact that we have established the high rate of interaction of trialkylamine, which contains one alkyl radical with the number of carbon atoms (hereinafter - C) of at least 8 (hereinafter - TAA), with glyphosate, dicamba, 2,4-D acid and clopyralid in the polar medium (water ) with the receipt of TAA salts, the fundamental possibility becomes a technical reality that is the essence of this invention.

The working fluid is obtained immediately before use by reacting a herbicidally effective amount of N-phosphonomethylglycine, or 2,4-dichlorophenoxyacetic acid, or 2-methoxy-3,6-dichlorobenzoic acid, or 3,6-dichloropyridinecarboxylic acid, with a trialkylamine containing one alkyl radical with the number of carbon atoms not less than 8, while taken in an equimolar or excess molar amount relative to the active substance of the herbicide, in an aqueous medium.

As our studies have shown, the preparation time of the working fluid according to the invention, commensurate with the same when working with traditional herbicidal preparations, is achieved with a small molar (not more than 10%) excess of TAA with respect to AI herbicides (glyphosate, dicamba, 2,4-D acid, clopyralid).

The working fluid is prepared as follows.

The required amount of water is poured into the sprayer tank, then with the stirrer operating, based on the herbicidally effective amount of glyphosate, or 2,4-D acid, or dicamba, or clopyralide, equimolar or excess is poured (not more than 10% of the molar amount of a.v. ) the amount of trialkylamine, which contains one alkyl radical with the number of carbon atoms of at least 8, is stirred for 3 minutes and the required amount of glyphosate, or 2,4-D acid, or dicamba, is poured into the resulting emulsion of the indicated trialkylamine, lopyralide. Stirred for another 5-10 minutes and get micellar solutions of working fluids. The entire operation to prepare the working fluid ends within 10-15 minutes.

The principal issue in the preparation of the working fluid is the sequence of adding the sprayer to the sprayer tank. herbicides and said trialkylamine. Initial loading into the sprayer tank herbicide lengthens the formation of the working fluid during the interaction of AI with trialkiamine almost 2 times or more in comparison with the reverse situation.

The interaction of the active substance of a herbicide selected from the group comprising N-phosphonomethylglycine, 2,4-dichlorophenoxyacetic acid, 2-methoxy-3,6-dichlorobenzoic acid, 3,6-dichloropyridinecarboxylic acid, with a trialkylamine containing one alkyl radical with the number of carbon atoms not less than 8, is carried out by preliminary formation of an emulsion of the indicated trialkiamine in water, followed by the addition of the active substance of the herbicide.

The foregoing is illustrated by the following examples.

In the table. 1 shows data confirming the dependence of the rate of interaction of a trialkylamine containing one alkyl radical with a number of carbon atoms of at least 8, with active substances in an aqueous medium from a molar excess of TAA relative to ae. herbicides.

The experiments are as follows.

800 ml of water are poured into a 1 L round-bottom flask, then TAA containing one alkyl radical with at least 8 carbon atoms is added sequentially with stirring until the formation of an emulsion and then add herbicide.

Concentration of AI the herbicide in 1 liter of working fluid is the average of the accepted in practice the use of traditional herbicidal preparations containing the same active substances.

In the table. Figure 2 shows comparative data confirming the identity of the quality of the working fluid obtained as a result of the preliminary synthesis of surfactant TAA salts of glyphosate, 2,4-D acid, dicamba and clopyralide with the working fluid obtained by mixing the active ingredients of the herbicides with the specified TAA in an aqueous medium.

As shown by the results of vegetative experiments (test plant - pea), the biological effectiveness of working fluids formed with the participation of surface-active TAA salts obtained in the traditional way and according to the invention turned out to be fundamentally identical, but significantly higher than that obtained using practical ones preparations based on the same active substances (table. 3).

Thus, in the production chain of the production and use of preparations based on surface-active TAA salts of glyphosate, 2,4-D acid, dicamba and clopyralide, the proposed invention eliminates the stages of synthesis and formulation of drugs, which will significantly affect the economy of protecting crops from weed and unwanted vegetation.

Claims (2)

1. A method of obtaining a working fluid of a herbicidal agent based on the surface-active properties of a trialkylamine salt of the active ingredient of a herbicide selected from the group consisting of N-phosphonomethylglycine, 2,4-dichlorophenoxyacetic acid, 2-methoxy-3,6-dichlorobenzoic acid, 3, 6-dichloropyridinecarboxylic acid, in which one alkyl radical contains at least 8 carbon atoms, in an aqueous medium, characterized in that the working fluid is obtained immediately before use by reacting herbicidally effective amount of N-phosphonomethylglycine, or 2,4-dichlorophenoxyacetic acid, or 2-methoxy-3,6-dichlorobenzoic acid, or 3,6-dichloropyridinecarboxylic acid, with trialkylamine containing one alkyl radical with at least 8 carbon atoms, at this taken in an equimolar or excess molar amount relative to the active substance of the herbicide, in an aqueous medium, and the interaction of the specified active substance of the herbicide with the specified trialkylamine is carried out by preliminary formation of an emulsion of trialkamine in water followed by addition of the active ingredient of herbicide. 2. The method according to p. 1, characterized in that the excess molar amount of trialkylamine containing one alkyl radical with the number of carbon atoms of at least 8, is not more than 10% of the molar amount of the active substance of the herbicide.