CS275724B6 - Herbicide and process for preparing thereof - Google Patents

Abstract

The herbicide formulation contains 30 to 60 $ ‘Hmot. 4-amino-l-phenyl-5-chloro-6-one, polyaddition of ethylene oxide and castor oil, sulphite leachate, ethylene glycol, polydimethylsiloxane; of the microorganisms of the genus Xantomonas, formaldehyde and water, Herbioid preparation is produced in a dispersible form aqueous concentrate The solution finds application as a herbicide in agriculture.

Description

The invention relates to a herbicidal composition based on 4-amino-1-phenyl-5-chloro-6-pyridazone in the form of a dispersed concentrate in water and to a process for its preparation.

4-Amino-1-phenyl-5-chloro-6-pyridazone (chloridazon) is used as a herbicide in agriculture for the treatment of sugar beet and fodder beet. In the form of a dispersible powder, it is produced in our country under the name Burex 80. A certain disadvantage of the preparation is dust in the production as well as in the preparation of the application spray. Due to the higher fineness of solid particles with the possibility of band application in use as well as to reduce the rates of active substance per hectare, the pesticidal formulations introduce in the form of a dispersible aqueous concentrate (DKV). Hitherto known DKVs were predominantly of toxitropic thick consistency, with difficulties in emptying the packages. Relatively expensive surfactants had to be used to improve emptying.

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A new herbicidal composition has been found to contain economically advantageous simple surfactants which overcome the above drawbacks (

The herbicidal composition consists of 30 to 60% by weight. 4-amino-1-phenyl-5-chloro-6-pyridazone, 1.5 to 5% by weight, polyadduct of ethylene oxide and castor oil (Slovazol EL), 1 to 5% by weight, sulphate extract, 3 to 10% by weight, of ethylene glycol 0.01 to 1% by weight of polydimethylsiloxane (Lukosan S), 0.01 to 1% by weight of a polysaccharide based on microorganisms of the genus Xantomonas (Rhodopol 23), 0.01 to 0.3% by weight of formaldehyde. The rest, up to 100% by weight, is water.

A process for the preparation of a herbicidal preparation consisting in the preparation of an aqueous formaldehyde solution to which a polydimethylsiloxane (Lukosan S) is added and a sulphite extract, a polyadduct of ethylene oxide and castor oil (Slovazol EL) are added to the emulsion obtained. After homogenization, the active ingredient 4-amino-1-phenyl-5-chloro-6-pyridazone, followed by a polysaccharide based on microorganisms of the Xantomonase series (Rhodopol 23) in water and ethylene glycol, are added. The suspension obtained is wet-milled and, after homogenization, the herbicidal preparation is diluted with water to the desired concentration of 4-amino-1-phenyl-5-chloro-6-pyridazone. Rhodopol 23 can be added in the form of a powder, a gel in water, or in an aqueous solution of ethylene glycol. Rhodopol 23 is added to the mixture before or after wet milling of the suspension and after homogenization the herbicidal composition is diluted with water.

An advantage of the invention is the greater fineness of the particles of 4-amino-1-phenyl-5-chloro-6-pyridazone than in the form of a dispersible powder. Preparation of spraying in the field is safer in terms of protection of operating personnel as well as with respect to the adjacent vegetation and the surrounding nature. The possibility of clogging of the powdered preparation by wind is eliminated. The production of a herbicidal preparation in the form of DKV is much safer because the possibility of an explosion of organic dusts has been eliminated. The need for grinding, homogenization or packaging of dispersible powders in an inert atmosphere has been eliminated. /,,> ^a

It is preferred to add the polysaccharide based on the product of microorganisms of the genus Xantomonas after wet grinding of the mixture, or before and after wet grinding of the mixture. During wet mechanical milling, the properties of the polysaccharide based on the product of microorganisms of the genus Xantomonas change, which causes a reduction in the stability of the suspension of the dispersion concentrate, resp. aqueous suspension of the herbicidal preparation. When administering a polysaccharide based on a product of microorganisms of the genus Xantomonas to the mixture before wet milling, the amount of polysaccharide based on a product of microorganisms of the genus Xantomonas must be increased. aqueous suspension of the herbicidal preparation. The polysaccharide based on the product of microorganisms of the genus Xantomonas is in the form of a powder which forms gels on contact with water and / or ethylene glycol. Longer mixing of the mixture with the powdered polysaccharide based on the product of microorganisms of the genus Xantomonas must add more polysaccharide than adding the polysaccharide in the form of an aqueous and / or ethylene glycol gel to the mixture at the same stability of the dispersed herbicidal preparation. This follows from the fact that during mechanical mixing, resp. grinding of the polysaccharide destroys the polysaccharide molecule.

CS 275724 B6 2

Example 1

1680 ml of water, 6.8 g of a 36% strength by weight aqueous formaldehyde solution were added to a flask equipped with a stirrer. 6.8 g of polydimethylsiloxane and 68 g of sulphate extract in powder form. After stirring, 85 g of Slovazol EL were further added and, after homogenization, 1,375 g of 90.2% by weight were added from the hopper. 4-amino-1-phenyl-5-chloro-6-pyridazone in powder form. The mixture was stirred for 30 minutes. Ethylene glycol with Rhodopol 23 containing 50 ml of ethylene glycol and 1.1 g of Rhodopol 23 was then added to the flask. The mixture was stirred for 30 minutes and wet milled, then a gel containing 2.2 g of Rhodopol 23 and 100 ml of ethylene glycol was added again. and the mixture was homogenized by stirring for 30 minutes.

3,390 g of a suspension preparation containing 36.5% by weight of 4-amino-1-phenyl-5-chloro-6-pyridazone. The stability of 1% by weight, of the aqueous suspension prepared it is diluted ¹ in water with a total hardness of 30 ° E at 20 ° C for 30 minutes. was 91%. The residue on a 0.040 mm sieve was 0.08% by weight.

Example 2

The procedure of Example 1 was followed, except that a reaction kettle was used and the amounts were increased 1000 times and a water-ethylene glycol gel of Rhodopol 23 containing 0.5% by weight was used. Rhodopol 23, 50% by weight of ethylene glycol and 49.5% by weight of water.

The stability of a 1% by weight aqueous suspension of the herbicidal composition was 90.6%.

Example 3

The procedure of Example 1 was followed, except that 2,000 g of 90% by weight were added to the mixture. Of 4-amino-1-phenyl-5-chloro-6-pyridazone and the Rhodopol 23 gel were all added in ethylene glycol only after wet milling.

The suspension preparation contained 53% by weight. 4-amino-1-phenyl-5-chloro-6-pyridazone.

Example 4

The procedure of Example 1 was followed, except that Rhodopol 23 was added before homogenization and the mixture was then stirred for 1 hour.

* The herbicidal preparation contained 36.8% by weight. 4-amino-1-phenyl-5-chloro-6-pyridazone.

Herbicidal effects were compared with 80% 4-amino-1-phenyl-5-chloro-6-pyridazine (Burex 80). The dose of the herbicidal preparation was 9 kg / ha and Burex 80 4 kg / ha, at the same time 250 l of water were used per spray preparation. 6 beet in 1 row per 1 m was found in the area treated with Burex 80 and 5.95 beet in 1 row per 1 m in the flat treated with herbicide. No signs of phytotoxicity were observed in both areas,

Under greenhouse conditions, the biological effects of the herbicide were compared with Burex 80. Sugar beet (Beta vulgaris), chicken loin (Echinochloa crus-galli) grown in pots in an aluminum base were used as test objects, ϋ sugar beet was used from 50 plants , in hedgehogs curry foot from 215 plants per variant. The samples were applied to the podemargent and to the plants post-emergence (at the stage of completion of the development of 2 true leaves). The doses corresponded to 0.2 0.4 0.8 1.6

3.2 6.4 kg of 100% 4-amino-1-phenyl-5-chloro-6-pyridazone per 1 ha for post-emergence application and 1.1 2.2 4.4 kg per 1 ha for pre-emergence application. Phytotoxic effects were observed and evaluated continuously at weekly intervals for 4 weeks after application. There were no significant differences in the selectivity to sugar beet in pre-emergence or post-emergence application. The herbicidal effects were practically identical without significant differences and with regard to the time course of manifestations, the extent and intensity of the effects.

Example 5

The procedure of Example 1 was followed, except that a gel obtained by mixing 3.3 g of Rhodopol 23 and 150 ml of ethylene glycol was added all at once. 3 parallel experiments were performed, in the first experiment the gel was added before wet milling, in the second the gel was added during wet milling and in the third experiment the gel was administered only after wet milling.

The polydimethylsiloxane used had a viscosity of 209 mPas and a density at 20 ° C.

1.016 g / ml.

Stability of 1% by weight, aqueous suspension prepared by dilution with water with a total hardness of 30 ° N at 20 ° C for 30 min. were 85.2%, 88.9% and 90.6%. Susceptible preparations contained 36.2 wt. 36.3% by weight, and 36.2% by weight. 4-amino-1-phenyl-5-chloro-6-pyridazone.

Example 6

The procedure of Example 5 e was followed, except that an aqueous gel obtained by mixing 3.3 g of Rhodopol 23 and 150 ml of water was used. After wet milling, 150 ml of ethylene glycol was added to the mixture. .

The stability of the 1% by weight aqueous suspension was 86.3%, 88.9% and 91.2%. The suspension formulations contained 36.1% by weight, 36.1% by weight, and 36.2% by weight. 4-amino-1-phenyl-5-chloro-6-pyridazone.

The invention finds application in agriculture, where the herbicidal preparation is used in the protection of sugar beet.

Claims (3)

PATENT CLAIMS j A herbicidal preparation based on 4-amino-1-phenyl-5-chloro-6-pyridazone, characterized in that it contains 30 to 60% by weight of 4-amino-1-phenyl-5-chloro-6-pyridazone, 1.5 to 5% by weight, polyadduct of ethylene oxide and castor oil, 1 to 5% by weight, sulphate extract, 3 to 10% by weight, ethylene glycol, 0.01 to 1% by weight, polydimethylsiloxane, 0.01 to 1% by weight, polysaccharide based on the product of microorganisms of the genus Xantomonas, 0.01 to 0.3% by weight, formaldehyde and the remainder up to 100% by weight, is water. 2. A process for the preparation of a herbicidal preparation as claimed in claim 1, comprising preparing a mixture of an aqueous solution of formaldehyde, polydimethylsiloxane, sulphite extract, polyadduct of ethylene oxide and castor oil, and 4-amino-1-phenyl- -T CS 275724 B6 4 -5-chloro-6-pyridazone and the mixture obtained is wet-milled, characterized in that a polysaccharide based on a product of microorganisms of the genus Xantomonas and ethylene glycol is added to the mixture before and / or after grinding and, after homogenization, the herbicidal preparation is treated with water to the desired concentration of 4-amino-1-phenyl-5-chloro-6-pyridazone. 3. The method according to item 2, characterized in that the polysaccharide based on the product of microorganisms of the genus Xantomonas is added in the form of an aqueous and / or ethylene glycol gel.