CS262605B1 - Combined herbicide agent - Google Patents

Abstract

The solution relates to a combined herbicidal agent in the form of a dispersible powder containing -45 to 55% by weight. 4-amino-1-phenyl-5-chloro-6-pyridazone and 20 to 30 wt.% of 2,2-dichloropropionic acid, which further contains 0.6 to 1.0 wt.%. kaolin, 0.5 to 1.0 wt.% silicon dioxide, 0.25 to 1.0 wt.% copolymer of ethylene oxide with propylene oxide, the polymerization degree 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 wt.%. of sodium sulfate alkyl polyglycol ether with 12 to 14 C in alkyl and 3.2 to 16.4 wt.% sulfate leachate, with high selective effects against monocotyledonous weeds. The solution can be used in agriculture.

Description

262605 2

The present invention relates to a combined herbicidal composition in the form of a dispersible powder comprising 45 to 55 wt. 4-amino-1-phenyl-5-chloro-6-pyridazone (chloridazon): 20 to 30 wt. 2,2-dichloropropionic acid (dalapon) in the form of inorganic salts.

According to a known and well-known method of manufacture, 2,2-dichloropropionic acid (dalapone is produced in the form of a water-soluble sodium or potassium salt and these solutions are dalapone-based herbicidal preparations).

Chloridazone is finalized to form a dispersible powder or a liquid dispersible concentrate.

According to SD 580 670, the combination of chloridazone with dalapone is synergistically effective in destroying monocotyledonous and dicotyledonous weeds in sugarbeet and fodder beet cultures, which has resulted in an increase in hectare yields from 15.2 t to 24.7 t. : dalapon) is 2: 1.

Said synergistically active combined herbicidal composition is not produced industrially, which, as is the case in SU 580 670 mentioned, the subsequent application of chloridazone in the form of an aqueous suspension of dispersible powder and dalapone in the form of its sodium salt solution or the combined application of both herbicides in mass. 2: 1 ratio tank-mix.

The subsequent application does not always ensure optimum adherence to the required active ingredients and, in addition, the application must be done twice (with both chloridazone and dalapone), which increases application costs.

In preparing the application suspension directly on the treated land with the tank mix method, keeping the correct weight ratio of the active ingredients just as complicated and under certain conditions is difficult. Failure to comply with the optimum weight ratio of the active ingredients results in a reduction of the synergistic effect.

It has been found that the abovementioned drawbacks are eliminated by the combined herbicidal composition in the form of a dispersible powder containing 45 to 55% by weight. 4-amino-1-phenyl-5-chloro-6-pyridazone and 20 to 30 wt. 2,2-Dichloro-propionic acid of the present invention consisting essentially of 0.6-1.0 wt%, 0.5-1.0 wt%, 0.25 to 1.0 wt% O, 84 to 1.0% by weight 3.2 to 16.4% by weight of kaolin, silica, copolymer of ethylene oxide with propylene oxide, the polymerization stage of which ranges from 27 to 32 and the ethylene oxide content ranges from 37, -5 to 42 , 5%, sodium sulphate alkyl polyglycol ether with 12 to 14 carbon atoms, alkyl sulphite liquor

The preferred ratio of surfactant active ingredients was 1: 1 (copolymer-ethylene oxide and propylene oxide is 100%, sodium polyolycollate, sodium sulfate, 12% to 14%). The activity of this system is enhanced by the presence of a particulate sulphite leachate that has a weak anionic character (essentially lignosulphonic acid calcium salt) with a protective colloid function.

The active silica in a mixture of scaffold also has an absorbent function by which the liquid surfactants are converted into powder form.

The combined herbicidal composition of the present invention is a dispersible powder having a high particle size and suspension stability. 3 262605

It is applied preemergence or before sowing at a dose of 5 to 6.5 kg.ha and its effect is influenced by the type and moisture of the poodle.

The high stability and fineness of the combined herbicidal composition is documented by the fact that its 1% suspension after 30 minutes of sedimentation contains more than 84% of the composition in the suspension (see Table 1 > % and cumulative residue on the s40 / im max 0.8%.

The combined herbicidal composition of the present invention may be prepared from technical chloridazone containing 85-95% of the active ingredient and an inorganic or organic dalaponus salt containing 70-86% of the active ingredient.

These examples illustrate but do not limit the invention. Example 1

To the laboratory mixer was weighed 54.5 g of chloridazone containing 92% of the active substance by gas chromatography. Chloridazone was finely milled, the residue on the 125 µm site was 0.04% and the cumulative residue on the 40 µm sieve was 0.25%. While stirring with two-arm stirrer, 2.6 g of a dry disperser consisting of a mixture of 0.9 g of fine-grained SiC 2 + 0.6 g of kaolin + 0.25 g of ethylene oxide copolymer with propylene oxide and 0.85 g of sodium polyglycol ether of 13-24 C were added.

After stirring for 5 min, 9 g of sulfite leachate powder and 34 g of dalaponone in the form of sodium salt containing 74% of active ingredient were added.

The mixture of these substances was stirred for 5 minutes and after homogenization it was mixed into a laboratory room. The final combined herbicidal preparation obtained had the following qualitative characteristics: 50.1 wt. chloridazone, 25.0% dalapon, sieve 125 µl was 0.03%, cumulative sieve residue 40 / im was 0.06%, wettability was 18 s and suspendability (1% suspension in water 30 ° N) hard) was 90.6%.

Example2

160.8 kg of technical chloridazone containing 93.7% of the active substance with suitable granulometry were weighed into a semi-operational homogenizer, 7.8 kg of a powder disperser consisting of 1.8 kg of kaolin, 2.7 kg of SiO2, 0.75 kg of copolymer with ethylene oxide propylene oxide and 2.55 kg of alkyl polyglycol ether of sodium sulfate with 12 to 14 C in alkyl. To this mixture, 28.8 kg of sulphite powder powder and 102.6 kg of sodium dalapone containing 74% of active ingredient were added. This mixture was subjected to about 30 min homogenization and then blended on a pin mill.

The 300 kg of the final preparation thus prepared little of these qualitative parameters: 49.8% chloridazone, 25.2% dalapone fresh sample suspendability at 14 days storage at 55 ° CZmachine fresh sample at 14 days storage at 55 ° CGranulometry fresh sample0.03% accumulated residue at sitepo 14 days storage at 55 ° Sieve sieve 125 µm = 0.095% sieve residue 40 µm = 89.0% 86.34% 14 s 7 s sieve residue 125 µm = 40 µm = 0.06 % 0.22% 262605

Compare suspension stability! a combined herbicide containing chloridazone and dalapon as active ingredients; a 2: 1 ratio of dispersible powder to the use of a surfactant system according to the invention with suspension stability using other surfactants is shown in Tables 1 and 2.

In addition, the dalapon also has a beneficial effect on suspension stability. Table 1 shows the composition and suspendability (suspension stability) of a sample of chloridazone without dalapone, which was formulated as a dispersible powder using a surfactant and adjuvant system (kaolin, siloxide and sulfite liquor) according to the invention.

Table 1

Stability of the combined herbicide suspensions according to the invention

The surfactant system used The copolymer of ethylene oxide with propylene oxide with a polymerization degree of 27 to 32 + alkyl polyglycol ether sodium sulfate with 12 to 14 carbon atoms in the alkyl number of the example 1 2 3 4 9 10 sample type mentioned production production semi-product. Chloride- in PV PV Batch Lot Sample Zone 80 DP Incl. 1 příkl. 2 11/86 2/87 319/84 excl. Dala- 1 017 kg 1 010 kg offers technical chloridazone in% by weight. 54.5 53.6 55.06 59.4 55.66 87.3 Content of the substance in mass. % v .techn. chloridazone 92 93,7 90,0 86,0 90 92 kaolin in mass % 0.6 0.6 0.6 0.6 0.99 0.97 obs. % 0.9 0.9 0.88 0.89 0.5 1.45 copolymer of ethylene dioxide with propylene oxide, 100 t. % 0,25 0,25 0,30 0,30 0,25 0,4 alkyl sulphonate polyglycol ether with 12-14 C in alkyl 30% w / w substance in mass t 0.85 0.85 0.88 0.79 1.0 1.35 sulphite leachate in mass. «9.0 9.6 8.85 3.37 7.67 8.53 Dalapon Na-sol 74 tuc. in wt. % 34.0 34.2 33.43 34.65 33.93 - Chloridazon 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 - Suspension stability (* suspension formulation!) After 30 min. sedimentation 90.6 89.0 86.0 88.0 92.44 84

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.