CS262605B1 - Combined herbicide - Google Patents

Abstract

The present invention relates to a combination herbicide dispersible a powder containing -45 to 55 wt. 4-amino-1-phenyl-5-chloro-6-pyridazone a 20 to 30 wt. 2,2-dichloropropionic acid acid which further contains 0.6 to 1.0 wt. % of kaolin, 0.5 to 1.0 wt. % silica, 0.25 to 1.0 wt. copolymer ethylene oxide with propylene oxide of which the polymerization degree ranges 27 to 32 and the ethylene oxide content moves in the range of 37.5 to 42.5%, 0.84 to 1.0 wt. sodium polyglycol ether with 12 to 14 C in alkyl and 3.2 to 16.4% wt. sulfate liquor, high selective acting against monocotyledonous weeds. The solution can be used in agriculture.

Description

The present invention relates to a combined herbioid composition in the form of a dispersible powder containing 45 to 55% by weight of the composition. % 4-amino-1-phenyl-5-chloro-6-pyridazone (chloridazone); 2,2-dichloropropionic acid (dalapone) in the form of inorganic salts.

According to the known and conventional process, 2,2-dichloropropionic acid (dalapone) is prepared in the form of a water-soluble sodium or potassium salt and these solutions are herbicidal preparations based on dalapone.

Chloridazone is finalized into a dispersible powder or a liquid dispersible concentrate.

According to SU 580 670, the combination of chloridazone with dalapone is synergistically effective in the control of weed and dicotyledonous weeds in sugar and fodder beet cultures, resulting in an increase in hectare yields from 15.2 t to 24.7 t. The optimum-weight ratio of active ingredients (chloridazone: dalapone) is 2: 1.

Said synergistic combined herbioid formulation is not industrially produced, as required by SU 580 670, following application of chloridazone in the form of an aqueous suspension of dispersible powder and dalapone in the form of its sodium salt solution, respectively. co-application of both herbicides in mass. 2: 1 tank mix.

Subsequent application does not always ensure optimal adherence to the required ratio of active substances and, moreover, application must be carried out twice (with both chloridazone and dalapone), which increases application costs.

When preparing the application suspension directly on the treated plot by means of a tank mix, keeping the correct weight ratio of the active substances is just as complicated and reductive under the given conditions. Failure to observe the optimum weight ratio of the active ingredient content results in a reduction of the synergistic effect.

It has been found that the above-mentioned drawbacks are overcome by the combined herbioid composition in the form of a dispersible powder containing 45 to 55% by weight. % Of 4-amino-1-phenyl-5-chloro-6-pyridazone and 20 to 30 wt. 2,2-Dichloropropionic acid according to the invention, characterized in that it contains Saley

0.6 to 1.0 wt. 0.5 to 1.0 wt. 0.25 to 1.0 wt

0.84 to 1.0 wt

3.2 to 16.4% by weight of kaolin, silica, a copolymer of ethylene oxide with propylene oxide, the polymerization step of which 6a is in the range of 27 to 32 and the content of ethylene oxide is in the range of 37, -5 to 42.5%; C 12 -C 14 alkyl and sulfite leachate

A 1: 1 ratio of surfactant active compounds has proved to be the preferred weight ratio (ethylene oxide-propylene oxide copolymer is 100%, alkyl polyglycol ether of sodium sulfate with 12-14 ° C in an alkyl solution of 30%). The efficiency of this system is enhanced by the presence of a powdered sulphite liquor having a weak anionic nature (essentially a lignosulfonic acid calcium salt) with a protective colloid function.

The active silica in the scaolin mixture also has the function of an absorbent, which transforms the liquid surfactants into a powder form.

The combination herbicidal composition of the present invention is a dispersible powder with high particle fineness and suspension stability.

It is applied pre-emergence or before sowing at a dose of 5 to 6.5 kg.ha. Its effect is influenced by the type and moisture of the soil.

The high stability and fineness of the combined herbicidal agent is documented in that its 1% suspension after 30 minutes sedimentation contains more than 84% of the composition in suspension (see Table 1). 1% and cumulated residue on a 40 µm sieve max 0.8%, wettability up to 45 sec.

The combination herbicidal composition according to the invention can be prepared from technical chloridazone containing 85 to 95% active ingredient and inorganic or organic salt of dalapone containing 70 to 86% active ingredient.

These examples illustrate but do not limit the scope of the invention.

Example 1

54.5 g of chloridazone containing 92% of the active substance as determined by gas chromatography were weighed into a laboratory mixer. Chloridazone was finely ground, the sieve residue at 125 µm was 0.04%, and the accumulated residue on sieve 40 µm was 0.25%. While stirring with a twin-arm stirrer, 2.6 g of dry dispersant consisting of a mixture of 0.9 g of fine-grained SiC2 + 0.6 g of kaolin + 0.25 g of ethylene oxide-propylene oxide copolymer and 0.85 g of alkyl polyglycol ether of sodium sulfate with 13 to 18 g were added. 24 C.

After stirring for 5 min, 9 g of powdered sulphite liquor and 34 g of dalapone in the form of a sodium salt containing 74% of the active substance were added to the silane.

The mixture was stirred for 5 minutes and after homogenization it was ground in a laboratory mill. The final combined herbicidal product obtained had the following qualitative characteristics:

50.1 wt. chloridazone, 25.0% dalapone, sieve residue 125 µm was 0.03%, cumulative sieve residue 40 µm was 0.06%, wettability of the formulation was 18 s and suspensibility (stability of 1% suspension in water 30 ° N harder) was 90.6%.

Example 2

To a pilot homogenizer was charged with 160.8 kg of technical chloridazon containing 93.7% of active ingredient of satisfactory grain size, 7.8 kg of powdered dispersing agent pozostávajúoeho of 1.8 kg of kaolin, 2.7 kg SiO _2, 0.75 kg of copolymer etylénoxiduspropylénoxidom and 2.55 kg of alkyl polyglycol ether of sodium sulfate with 12 to 14 C in alkyl.

28.8 kg of powdered sulphite liquor and 102.6 kg of dalapone sodium containing 74% of active ingredient were added to this mixture. This mixture was subjected to homogenization for about 30 minutes and then ground in a pin mill.

Thus prepared 300 kg of the final product little these qualitative parameters:

49.8% chloridazone, 25.2% dalapone fresh sample suspendability after 14 days storage at 55 ° C Wettability of fresh sample after 14 days storage at 55 ° C Granulometry for fresh sample 0.03% cumulative sieve residue after 14 days storage at 55 ° C sieve residue 125 µm = 0.095% cumulated sieve residue 40 µm =

89.0%

86,34% s

s sieve residue 125 / um = 40 / im = 0,06%

0.22%

Comparison of suspension stability! % of a combination herbicide containing chloridazone and dalapone as active ingredients in a wt. a 2: 1 ratio rendered into a dispersible powder using the surfactant system of the present invention with suspension stability; using other surfactant systems, see Tables 1 and 2.

In addition, dalapone also positively affects the stability of the suspension. Table 1 shows the composition and suspensibility (suspension stability) of a dalapone-free chloridazone sample that has been formulated as a dispersible powder using a surfactant and excipient system (kaolin, siloxide and sulfite liquor) according to the invention.

Table no. 1

Stability of suspension! of a combination herbicide according to the invention

The surfactant system used Propylene oxide ethylene oxide copolymer with a polymerization degree of 27 to 32 + alkyl polyglycol ether sodium sulfate of 12 to 14 carbon atoms in alkyl

Example number 1 2 3 4 9 10 type of sample listed listed manufacturing manufacturing poloprev. Chlorida- v PV PV batch batch sample zones 80 DP Ex. 1 Ex. 2 11/86 2/87 319/84 without Dala- 1,017 kg 1 010 kg Ponu technical chloridazone in% wt. 54.5 53.6 55,06 59.4 55,66 87.3 Cont. substances in mass % v .techn. chloridazon 92 93.7 90.0 86.0 90 92 obs. kaolin in wt. % 0.6 0.6 0.6 0.6 0.99 0.97 obs. Siloxide in wt. % 0.9 0.9 0.88 0.89 0.5 1.45 ethylene oxide copolymer with propylene oxide, 100% eq. substances in mass % 0.25 0.25 0.30 0.30 0.25 0.4 alkyl polyglycol ether of sodium sulfate with 12-14 C in alkyl 30% acc. substances in mass % 0.85 0.85 0.88 0.79 1.0 1.35 sulphite leach powder in mass % 9.0 9.6 8.85 3.37 7.67 8.53 Dalapon Na-sol 74 t in mass % 34.0 34.2 33.43 34.65 33,93 - Chloridazone 100% 50.14 50.2 49.6 51.1 5? 0 80.3 Dichloropropionic acid. 25.16 25.3 24.7 25.6 25.1 - Stability of suspension! (* weight of the preparation in suspension!) after 30 min. sedimentation 90.6 89.0 86.0 88.0 92.44 84

Table 2

Composition of laboratory samples of the combined herbicide formulated into dispersible powders using surfactant systems other than those listed in Table 1 (not according to the invention) and the stability of their suspensions!

Example number 5 5a 6 7 8 technical chloridazone in% wt. 55.55 55.55 53.76 56.70 52,71 active substance content in techn. chloridazon 90.0 90 93.0 88.2 94.85 % kaolin 1.12 1.2 1.25 - - Siloxide in% wt. - - 0.75 1.5 1.88 ricinoleic acid polyethylene glycol ester (about 20 C ₂ H 4 O groups, 76 and 3 wt% C 1 H 4 O) in% wt. 0,125 0.25 polyethylene glycol ether ointment. % alcohol (content 47-5% C 1 H 4 O) in% wt. 0,375 0.75 · 0.66 polyethylene glycol ether dibenzyl- -betanaphthol in% wt. 0.25 0.3 - - - % polyethylene glycol ether of tribenzylphenol (approx. 30 C ₂ H 4 O groups) in wt. - - - - 1.32 sodium dibutyl naphthylsulfonate solution % wt. 0.69 0.7 - - - % sulphite leach powder 8.61 8.47 9.94 7.00 9.73 Dalapon Na-sol, 74% E 1. 33.78 33.78 33.80 33.8 33.8 % Chloridazone 100% wt. 50.0 50.0 50.0 50.0 50.0 % dichloropropionic acid in% wt. (Dalapon) 25.0 25.0 25.0 25.0 25.0 suspension stability (% by weight of the product remaining in suspension after 30 min of sedimentation) 74.3 78.8 68.7 61.3 50.3

OBJECT OF THE INVENTION

Claims (2)

OBJECT OF THE INVENTION Combined herbicidal composition in the form of a dispersible powder containing from 45 to 55% by weight of the composition. % Of 4-amino-1-phenyl-5-chloro-6-pyridazone and 20 to 70 wt. 2,2-dichloropropionic acid, characterized in that it further comprises 0.6 to 1.0 wt. 0.5 to 1.0 wt. 0.25 to 1.0 wt. % of a copolymer of ethylene oxide with propylene oxide, the degree of polymerization of which ranges from 27 to 32 and the content of ethylene oxide ranges from 37.5 to 42.5%, 0.84 to 1.0% by weight; % alkylpolyglycol ether of sodium sulfate with 12-14C in alkyl, 3.2-16.4 wt. sulphite leach.