RU2444191C1 - Herbicidal composition - Google Patents

Abstract

FIELD: chemistry.

SUBSTANCE: invention relates to agriculture and specifically to protection of grain crops and maize from weeds. The herbicidal composition contains 2-methoxy-3,6-dichlorobenzoic acid and a co-herbicide. 2-methoxy-3,6-dichlorobenzoic acid is presented in form of an normal or isomeric C₅-C₁₀ ester or a trialkylamine salt or an oxyethylated alkylamine salt, one alkyl radical or an oxyethylated chain containing not less than 8 carbon atoms. The co-herbicide is N-(2,6-difluorophenyl)-5-methoxy-8-fluoro-1,2,4-triazolo-1,5-pyrimidine-2-sulphamide (florasulam) in form of a trialkylamine salt or an oxyethylated alkylamine salt, one alkyl radical or an oxyethylated chain containing not less than 8 carbon atoms. The composition additionally contains a nonionic surfactant. The composition is presented in form of an emulsion concentrate.

EFFECT: invention enables to obtain a preparation in form of an emulsion concentrate which is stable in aqueous solutions.

4 cl, 1 tbl, 7 ex

Description

The invention relates to agriculture, and in particular to solving the problem of protecting crops of grain crops and corn from weeds.

A significant number of drugs based on dicamba (2-methoxy-3,6-dichlorobenzoic acid) and chlorosulfuron used for this purpose is known (Handbook of pesticides and agrochemicals approved for use in the Russian Federation. M: Agrorus, 2008, P.186, 187). The preparations are presented in the form of water-dispersible granules (VDG) or aqueous solutions (VR) of diethylethanolamine or dimethylamine salts.

Known herbicide suspension according to patent RU 2113793 (publ. 06/27/1998) containing dicamba and coherbicide - sulfonylurea.

Virtually chlorosulfuron, regardless of the form of the drug, has one drawback - an aftereffect that does not allow for normal crop rotation.

For aqueous solutions, the question of stability of chlorosulfuron additionally arises. Therefore, the shelf life of drugs containing, along with dicamba, chlorosulfuron, is limited to 0.5-1 years.

In order to eliminate the noted drawbacks of preparations containing dicamba and chlorosulfuron, we proposed a new technical solution.

The essence of the invention is as follows:

- the active ingredient is known to the flurasulam (N- (2,6-difluorophenyl) -5-methoxy-8-fluoro-1,2,4-triazolo-1,5-pyrimidine-2-sulfamide) used in doses similar to chlorosulfuron ( 5-6 g / ha) in the fight against weeds in crops of grain crops. Florasulam is stable in time, has no aftereffect, i.e. allows full crop rotation;

- difficulties when working with florasulam are associated with its insolubility in both water and organics, which determines the form of its use (Handbook of pesticides and agrochemicals approved for use on the territory of the Russian Federation. M: Agrorus, 2008, P.154) - suspension emulsion ;

- the fact that we have established of the formation of flurasulam with a tertiary alkylamine or hydroxyethylated alkylamine during the interaction, one of the alkyl radicals or an ethoxylated chain of which contains at least 8 carbon atoms, which have surface-active properties of salts that are readily soluble in C ₅ -C ₁₀ esters of normal or isostroeniya, allowed to create a drug in the form of an emulsion concentrate, devoid of all the previously listed drawbacks for drugs containing dicamba and chlorosulfuron.

The herbicidal composition contains dicamba (2-methoxy-3,6-dichlorobenzoic acid) and coherbicide as flurasulam as the active ingredient, while dicamba is in the form of normal or isostructure C ₅ -C ₁₀ ester and / or trialkylamine surfactant properties salt or oksietilirovanny alkylamine salt, and florasulam - in the form having surface-active properties of a trialkylamine salt or oksietilirovanny alkylamine salt, and in these salts one alkyl radical or oksietilirovanny the chain contains at least 8 carbon atoms. The herbicidal composition may further comprise a nonionic type surfactant. The preparative form of the herbicidal composition is an emulsion concentrate.

The herbicidal composition contains components in the following ratio,% wt .:

C ₅ -C ₁₀ 2-methoxy-3,6-dichloro ester normal or isobenzoic acid 67-0 trialkylamine salt or hydroxyethylated alkyl amine salt of 2-methoxy-3,6-dichlorobenzoic acid 0-97 trialkylamine salt or hydroxyethylated N- (2,6-difluorophenyl) alkylamine salt -5-methoxy- 8-fluoro-1,2,4-triazolo-1,5-pyrimidin-2-sulfamide 3-15 nonionic type surfactant 0-30

A formulation in the form of an emulsion concentrate is prepared as follows.

In a flask with a stirrer, put the calculated amount of normal or isostructure of dicamba C ₅ -C ₁₀ ester, and with stirring, add the calculated amount of florasulam, tertiary alkylamine or ethoxylated alkylamine, one alkyl radical or ethoxylated of which contains at least 8 carbon atoms, and a surface-active non-ionic substances. The process is carried out at room temperature until complete dissolution of florasulam.

Given the physicochemical properties of the trialkylamine or hydroxyethylated alkylamine salt of dicamba (mobile fluid, surface activity at the level of modern ion-active surfactants), an emulsion concentrate is prepared as follows.

The calculated amount (including dicamba and florasulam) of tertiary alkylamine or hydroxyethylated alkylamine, one alkyl radical or ethoxylated chain of which contains at least 8 carbon atoms, is placed in a flask with a stirrer. The calculated amount of dicamba and florasulam is added and mixed until a homogeneous solution is obtained. The obtained samples are analyzed for the quality of the drug and the working fluid (table).

Example 1

100 g of dicamba 2-ethylhexyl ether, 4 g of florasulam, 4 g of dimethylalkyl (C ₉ -C ₁₂ ) amine and 40 g of neonol are successively charged into the flask.

Example 2

55 g of tertiary dimethylalkyl (C ₉ -C ₁₂ ) amine, 50 g of technical dicamba and 4 g of florasulam are loaded into the flask.

Example 3

50 g of dicamba hexyl ester, 55 g of tertiary diethylalkyl (C ₁₀ -C ₁₄ ) amine, 50 g of technical dicamba, 5 g of flurasulam and 15 g of syntanol are loaded into the flask.

Example 4

35 g of dicamba isoamyl ester, 65 g of tertiary methylisopropylalkyl (C ₉ -C ₁₂ ) amine, 60 g of technical dicamba, 5.5 g of florasulam and 10 g of syntamide are loaded into the flask.

Example 5

65 g of tertiary methylethylalkyl (C ₁₀ -C ₁₄ ) amine, 60 g of technical dicamba, 35 g of dicamba octyl ether, 5.7 g of florasulam and 5 g of neonol are loaded into the flask.

Example 6

70 g of ethoxylated isopropylamine, the ethoxylated chain of which contains at least 8 carbon atoms, 60 g of technical dicamba, 35 g of dicamba 2-ethylhexyl ether, 5.7 g of Florasulam and 5 g of neonol are loaded into the flask.

Example 7

50 g of dicamba heptyl ester, 60 g of primary ethoxylated amine with the number of carbon atoms in the C ₈ -C ₁₀ ethoxylated chain, 50 g of technical dicamba, 5 g of florasulam and 15 g of neonol are loaded into the flask.

Table Properties of preparations and working fluids of preparations Example No. Physical state Fluid quality Drop size, microns Stability day one Clear tan liquid 1-5 1 day, oil loss 0.5 mm, easily demulsified 2 - "- less than 1 micron, micellar solution 4 days, stable clear solution 3 - "- 1-3 1 day, oil loss 0.3 mm, easily demulsified four - "- 1-2 1 day, oil loss 0.2 mm, easily demulsified 5 - "- - "- - “-“ - “- 6 - "- less than 1 micron 1 day, no precipitation 7 - "- - "- 1 day, there is no sediment, only a small turbidity, which diverges when turned over

Claims (4)

1. A herbicidal composition containing 2-methoxy-3,6-dichlorobenzoic acid and a co-herbicide, characterized in that 2-methoxy-3,6-dichlorobenzoic acid is in the form of a normal or isostructural C ₅ -C ₁₀ ester or trialkylamine salt or an ethoxylated alkylamine salt, one alkyl radical or ethoxylated chain of which contains at least 8 carbon atoms and contains N- (2,6-difluorophenyl) -5-methoxy-8-fluoro-1,2,4-triazolo as a co-herbicide -1,5-pyrimidine-2-sulfamide (florasulam) in the form of a trialkylamine salt, or hydroxyethyl ovannoy alkylamine salts, one alkyl radical or ethoxylated chain which contains at least 8 carbon atoms. 2. The herbicidal composition according to claim 1, characterized in that it further comprises a non-ionic type surfactant. 3. The herbicidal composition according to claim 2, characterized in that it contains components in the following ratio, wt.%:
C ₅ -C ₁₀ 2-methoxy-3,6-dichloro ester normal or isobenzoic acid 67-0 trialkylamine salt or hydroxyethylated alkylamine salt of 2-methoxy-3,6-dichloro- benzoic acid 0-97 trialkylamine salt or hydroxyethylated alkylamine salt of N- (2,6-difluorophenyl) -5-methoxy- 8-fluoro-1,2,4-triazolo-1,5-pyrimidin-2-sulfamide 3-15 non-ionic surfactant 0-30 4. The herbicidal composition according to any one of claims 1 to 3, characterized in that it is presented in the form of an emulsion concentrate.