RU2356228C2 - Herbicide compound - Google Patents

Abstract

FIELD: agriculture.

SUBSTANCE: compound contains triethanolamine, water, sulfonyl urea with the following mole ratio: 0.043:1:0.05 or 0.05:0.049:1 or 0.045:2:0.05 respectively.

EFFECT: enhancement of the compound stability.

11 ex, 2 tbl

Description

The invention relates to agriculture, namely to chemicals used for weed control in crops of grain crops. Herbicidal compositions contain sulfonylurea derivatives.

All herbicides that include compounds of a number of sulfonylureas in their composition have significant advantages over others, because they have low consumption rates (8-50 g / ha for the active substance) and high selectivity.

The low solubility of sulfonylureas in water and the relatively high hydrolysis rate of salts of these compounds do not allow the release of water-soluble preparations. Therefore, generally known sulfonylurea-based herbicidal compositions are wettable powders or microgranules [1], aqueous suspensions stabilized with salts of organic and inorganic acids [2], aqueous suspensions stabilized with surface-active substances [3].

The closest solution is the herbicidal composition [4], containing N - [(4-methoxy-6-methyl-1,3,5-triazin-2-yl) aminocarbonyl] -2-chlorobenzenesulfonamide and water as the active compound, in addition , it additionally contains monoethanolamine or diethylethanolamine and triethylene glycol in the following ratio, wt.%:

N - [(4-methoxy-6-methyl-1.3.5-triazin-2-yl) aminocarbonyl] -2-chlorobenzene-sulfonamide 10-55.6;

Monoethalomine or diethylethanolamine 3.4-35.4;

Triethylene glycol 25.35-74.9;

Water is the rest.

However, the preparations given in [4] did not find practical application due to the low stability of chlorosulfuron in the preparation during long-term storage.

The aim of the invention is the development of water-soluble herbicidal compositions based on sulfonylureas with high storage stability.

The goal is achieved due to the fact that the herbicidal composition containing sulfonylurea, as a solvent further comprises an aqueous solution of a sulfonylurea salt with triethanolamine.

Example 1

0.05 moles of chlorosulfuron are added to a solution containing 0.035 moles of triethanolamine and 1 mole of water, and the mixture is thoroughly stirred for 2 hours at a temperature of 20-25 ° C. Chlorosulfuron does not completely dissolve.

Example 2

0.05 moles of chlorosulfuron are added to a solution containing 0.043 moles of triethanolamine and 1 mole of water, and at a temperature of 20-25 ° C the mixture is thoroughly mixed for 2 hours until the latter is completely dissolved. The resulting chlorosulfuron solution was tested for stability and herbicidal activity (Tables 1 and 2).

Example 3

Preparation of the drug is carried out in the same way as in example 2, only with the following component ratios of 0.049: 1: 0.05. The resulting aqueous solution of chlorosulfuron salt was tested for stability and herbicidal activity (Tables 1 and 2).

Example 4

Preparation of the drug is carried out in the same way as in example 2, only with the following component ratios 0.05: 1: 0.05. The resulting aqueous solution of chlorosulfuron salt is tested for stability (table 1).

Example 5

Preparation of the drug is carried out in the same manner as in example 1, only with the following component ratios of 0.45: 0.9: 0.05. Chlorosulfuron does not completely dissolve in the mixture, and part precipitates over time.

Example 6

To a solution containing 0.045 moles of triethanolamine and 2 moles of water, add 0.05 moles of metsulfuron methyl and at a temperature of 20-25 ° C the mixture is thoroughly mixed for 2 hours until the latter is completely dissolved. The obtained Metsulfuron-methyl solution was tested for stability and herbicidal activity (Tables 1 and 2).

Example 7

0.05 moles of halosulfuron methyl are added to a solution containing 0.045 moles of triethanolamine and 2 moles of water and the mixture is thoroughly mixed for 2 hours until the latter is completely dissolved at a temperature of 20-25 ° C. The resulting halosulfuron-methyl solution was tested for stability and herbicidal activity (Tables 1 and 2).

Example 8

0.05 moles of azimsulfuron are added to a solution containing 0.045 moles of triethanolamine and 2 moles of water, and at a temperature of 20-25 ° C the mixture is thoroughly mixed for 2 hours until the latter is completely dissolved. The resulting azimsulfuron solution was tested for stability and herbicidal activity (Tables 1 and 2).

Example 9 (prototype).

To a mixture containing 0.7 g of water and 72.5 g of triethylene glycol, 6.8 g of monoethanolamine are added at a temperature of 40 ° C. The mixture is stirred and 20 g of chlorosulfuron are gradually added, stirred for 1 hour. The resulting mixture was tested for stability and herbicidal activity (Tables 1 and 2).

Example 10

Determination of the stability of herbicidal compositions by the method of accelerated storage.

Samples of the drug were analyzed for the content of mass fractions of sulfonylurea in 100 g of the drug, placed in glass hermetically sealed vials. Samples were stored in a thermostat at a temperature of 50 ± 1 C for 30 days. After the expiration of the storage period, the samples were analyzed for the content of sulfonylurea by liquid chromatography.

Example 11

Field trials of the compositions were carried out on wheat crops. Crops of spring wheat (Moscow 35) were mainly littered with white gauze, radish wild, squire, species of pikulniks, field bindweed, odorless chamomile, clobber, thistles, woodlice and others. The density of clogging of the plot of 1000 square meters was 140-160 pcs. ./sq.m. Processing was carried out in the phase of tillering of wheat. The effectiveness of the herbicidal compositions was taken into account one month after the treatment of the inhibition of the weight of the wet mass of weeds taken from 1 m2 of plot in comparison with the control (without herbicides). Accounting for the crop was carried out by continuous threshing of wheat.

Table 1 Stability of sulfonylurea compounds Preparations The sulfonylurea content before storage,% The content of sulfonylurea after storage,% % decomposition According to example 2
For example 3 42,2
41,4 42,2
41,4 0,0
0,0 For example 4 41.2 32,7 20.6 For example 6 30.8 30.8 0,0 For example 7 33.7 33.7 0,0 For example 8 33,2 33,2 0,0 Prototype (as in example 9) 20,0 14.8 26

table 2 Structure Dose, g / ha Inhibition of weed weight,% mass. Productivity, t / ha According to example 2
For example 3 6
6 93
89 25.8
24.4 For example 6 6 90 24.7 Prototype 6 76 22.2 Control (no herbicide) - - 19.1

Information sources

1. Patent RU 2147179 [A01N 25/14].

2. US patent No. 4936900 [A01N 25/14].

3. US patent No. 5707926 [A01N 25/04].

4. Patent RU No. 1394507 [A01N 25/04].

Claims (1)

A herbicidal composition containing sulfonylurea and water, characterized in that it further comprises triethanolamine with the following molar ratios of the ingredients: triethanolamine: water: sulfonylurea = 0.043: 1: 0.05, or 0.05: 0.049: 1, or 0.045: 2: 0.05.