Multi-element compound water dispersible granule for corn field and preparation method of multi-element compound water dispersible granule

Abstract

The invention provides a corn field multi-element compound water dispersible granule and a preparation method thereof, the corn field multi-element compound water dispersible granule is a water dispersible granule prepared by compounding aminopyridine salt, mesotrione and nicosulfuron salt, the control effect is good, the physical and chemical properties are stable, the corn field multi-element compound water dispersible granule is not easy to decompose and deteriorate to generate phytotoxicity, and the suspension rate reaches more than 96%; in the use process, the water dispersible granule only needs to be dispersed once, the use process is simple, and the water dispersible granule is a granular solid, is good in flowability, does not stick to the wall after being poured, and does not remain in a packaging container to form secondary pollution.

Description

Technical Field

[0001] This invention belongs to the field of pesticide and herbicide technology, specifically relating to a multi-component water-dispersible granule for corn fields and its preparation method. Background Technology

[0002] In recent years, the limited variety and excessive use of herbicides in cornfields have led to resistance in some weeds. Furthermore, with the changing nature of weed species, those not favored by conventional herbicides have become a major headache for growers. For example, in the Huang-Huai-Hai summer corn growing area, supplemental herbicide application has become commonplace in the last two years, but it still doesn't solve the problem. Firstly, the efficacy is generally low; secondly, some weeds emerge late, missing the optimal control time, and thirdly, application becomes inconvenient once the corn has closed the canopy. With land transfer and increasing mechanization, some climbing weeds become entangled in the corn during harvest, hindering mechanized operations.

[0003] Chlorpyrimethanil is a novel pyridine carboxylic acid herbicide developed by Tao Nongke. It is widely used for weed control in mountainous areas, grasslands, plantations, and non-cultivated land, and is currently under research and development for weed control in rapeseed and cereal crop fields. Mesotrione has good control effects on annual broadleaf weeds and some grassy weeds such as velvetleaf, amaranth, lambsquarters, knotweed, barnyard grass, and crabgrass in cornfields. However, it is less effective against ironweed and some grassy weeds. Nicosulfuron is a systemic herbicide that is absorbed by the stems, leaves, and roots of weeds, and then translocated within the plant, causing sensitive plants to stop growing, turn pale, and gradually die. Death usually occurs within 20-25 days, but may take longer for some perennial weeds in lower temperatures. It is most effective when applied before the 4-leaf stage after budding; efficacy decreases when seedlings are larger. This herbicide has pre-emergence activity, but its activity is lower than post-emergence activity.

[0004] The use of compound formulations of chlorpyrifos, mesotrione, and nicosulfuron in corn fields is rare. Because chlorpyrifos and mesotrione are highly acidic, formulations made from these two active ingredients on the market have a pH below 3, while nicosulfuron requires a pH between 6 and 8 to be stable. Therefore, the stability of compound formulations of these three active ingredients presents a significant challenge. Summary of the Invention

[0005] The purpose of this invention is to provide a multi-component water-dispersible granule for corn fields, based on existing technology. This water-dispersible granule is formulated from chlorpyrifos, mesotrione, and nicosulfuron salt. It exhibits good control effects, stable physical and chemical properties, and is not easily decomposed or deteriorated to cause phytotoxicity. Its suspension rate reaches over 96%. During use, only one dispersion is required, making the process simple. The water-dispersible granule is a granular solid with good flowability; it does not stick to the container walls after pouring and will not leave residues in the packaging container, thus preventing secondary pollution.

[0006] Another object of the present invention is to provide a method for preparing the above-mentioned multi-component water-dispersible granules for corn fields.

[0007] The technical solution of the present invention is as follows:

[0008] A multi-component water-dispersible granule for cornfields comprises the following components in parts by weight: 5-20 parts of chlorpyrifos, 25-45 parts of nicosulfuron, 10-30 parts of nicosulfuron salt, 3-10 parts of sodium polyacrylate, 3-10 parts of methylnaphthalene sulfonate formaldehyde condensate, 1-10 parts of fatty alcohol sulfonate and / or fatty alcohol sulfate, and 5-30 parts of filler; wherein, chlorpyrifos is sodium chlorpyrifos, potassium chlorpyrifos, or ammonium chlorpyrifos; nicosulfuron salt is sodium nicosulfuron; and the filler is corn starch and / or sodium carbonate.

[0009] In this invention, fatty alcohol sulfonates can be fatty alcohol sulfonates (Rhodia WEI / P), and fatty alcohol sulfates can be fatty alcohol sulfates (Rhodia LFW).

[0010] This invention provides a multi-component water-dispersible granule for corn fields. In its preparation process, chlorpyrifos, mesotrione, sodium nicosulfuron, sodium polyacrylate, methylnaphthalene sulfonate formaldehyde condensate, fatty alcohol sulfonate and / or fatty alcohol sulfate and filler are mixed evenly. After mixing, the mixture is air-jet pulverized to produce a powder with a particle size of 10-15 μm. The obtained powder is sprayed with water, kneaded, granulated and dried to obtain the water-dispersible granule.

[0011] In this invention, chlorpyridinate is sodium chlorpyridinate, potassium chlorpyridinate, or ammonium chlorpyridinate.

[0012] In this invention, the preparation of sodium chlorpyrifos salt includes the following steps: chlorpyrifos acid and sodium carbonate are mixed evenly, water is added to granulate, and particles with a particle size of 0.4 mm to 3.0 mm are prepared. After boiling and drying, sodium chlorpyrifos salt particles are obtained.

[0013] The weight ratio of chloropyridine acid to sodium carbonate is 100:25-30, preferably 100:26. The parameters for fluidized bed drying are as follows: inlet air temperature is 60-80℃, and the moisture content of the discharged product is maintained at 1.5-5%.

[0014] In this invention, the preparation of potassium chloropyridine acid salt includes the following steps: chloropyridine acid and potassium carbonate are mixed evenly, water is added to granulate the mixture to form particles with a diameter of 0.4 mm-3.0 mm, and the resulting particles are boiled and dried to obtain potassium chloropyridine acid salt particles. The weight ratio of chloropyridine acid to potassium carbonate is 100:34-40, preferably 100:35. The parameters for boiling and drying are as follows: the inlet air temperature is 60-80℃, and the moisture content of the discharged product is maintained at 1.5-5%.

[0015] In this invention, the preparation of ammonium chlorpyrifos salt includes the following steps: chlorpyrifos acid and ammonium carbonate are mixed evenly, water is added to granulate, and particles with a particle size of 0.4 mm to 3.0 mm are prepared. After boiling and drying, the resulting particles are obtained as ammonium chlorpyrifos salt particles.

[0016] The weight ratio of chlorpyrifos to ammonium carbonate is 100:25-30, preferably 100:27; the parameters for fluidized bed drying are as follows: the inlet air temperature is 60-80℃, and the moisture content of the discharged product is maintained at 1.5-5%.

[0017] In this invention, nicosulfuron salt is sodium nicosulfuron salt, and the specific preparation includes the following steps: mixing nicosulfuron with a sodium source evenly, adding water to granulate, and making particles with a particle size of 0.4 mm-3.0 mm. After boiling and drying the obtained particles, sodium nicosulfuron salt particles are obtained; wherein, the sodium source is sodium carbonate, sodium hydroxide or sodium methoxide.

[0018] For the purposes of this invention, the weight ratio of nicosulfuron to sodium carbonate is 100:13-15, preferably 100:14; the weight ratio of nicosulfuron to sodium hydroxide is 100:10-12, preferably 100:11; the weight ratio of nicosulfuron to sodium methoxide is 100:13-15, preferably 100:14; the parameters for fluidized bed drying are as follows: the inlet air temperature is 60-80℃, and the moisture content of the discharged product is maintained at 1.5-5%.

[0019] In a preferred embodiment, the multi-component water-dispersible granule for cornfields provided by the present invention comprises the following components in parts by weight: 12-15 parts of chlorpyrifos, 32-35 parts of nicosulfuron, 16-20 parts of sodium nicosulfuron, 5-8 parts of sodium polyacrylate, 5-7 parts of methylnaphthalenesulfonate formaldehyde condensate, 3-5 parts of fatty alcohol sulfonate and / or fatty alcohol sulfate, 5-6 parts of sodium carbonate, and 4-15 parts of corn starch. The chlorpyrifos is sodium chlorpyrifos, potassium chlorpyrifos, or ammonium chlorpyrifos.

[0020] In a more preferred embodiment, the multi-component water-dispersible granule for cornfields provided by the present invention comprises the following components in parts by weight:

[0021] 12 parts of sodium chlorpyrifos, 32 parts of nicosulfuron, 16 parts of sodium nicosulfuron, 5 parts of sodium polyacrylate, 5 parts of methylnaphthalene sulfonate formaldehyde condensate, 5 parts of fatty alcohol sulfonate, 5 parts of sodium carbonate, and 15 parts of corn starch.

[0022] 12 parts of potassium chlorpyrifos, 32 parts of nicosulfuron, 16 parts of sodium nicosulfuron, 5 parts of sodium polyacrylate, 5 parts of methylnaphthalene sulfonate formaldehyde condensate, 5 parts of fatty alcohol sulfonate, 5 parts of sodium carbonate, and 15 parts of corn starch.

[0023] 12 parts of ammonium chlorpyrifos, 32 parts of nicosulfuron, 16 parts of sodium nicosulfuron, 5 parts of sodium polyacrylate, 5 parts of methylnaphthalene sulfonate formaldehyde condensate, 5 parts of fatty alcohol sulfonate, 5 parts of sodium carbonate, and 15 parts of corn starch.

[0024] 15 parts of sodium chlorpyrifos, 35 parts of nicosulfuron, 20 parts of sodium nicosulfuron, 7 parts of sodium polyacrylate, 8 parts of methylnaphthalenesulfonate formaldehyde condensate, 3 parts of fatty alcohol sulfate, 6 parts of sodium carbonate, and 4 parts of corn starch.

[0025] 15 parts of potassium chlorpyrifos, 35 parts of nicosulfuron, 20 parts of sodium nicosulfuron, 7 parts of sodium polyacrylate, 8 parts of methylnaphthalenesulfonate formaldehyde condensate, 3 parts of fatty alcohol sulfate, 6 parts of sodium carbonate, and 4 parts of corn starch.

[0026] 15 parts of ammonium chlorpyrifos, 35 parts of nicosulfuron, 20 parts of sodium nicosulfuron, 7 parts of sodium polyacrylate, 8 parts of methylnaphthalenesulfonate formaldehyde condensate, 3 parts of fatty alcohol sulfate, 6 parts of sodium carbonate, and 4 parts of corn starch.

[0027] The present invention also provides a method for preparing the above-mentioned multi-component water-dispersible granules for corn fields, comprising the following steps:

[0028] (1) Preparation of chlorpyridinic acid: Chlorpyridinic acid and carbonate are mixed evenly, water is added and granulation is carried out to form particles with a particle size of 0.4 mm-3.0 mm. After boiling and drying, chlorpyridinic acid particles are obtained; wherein the carbonate is sodium carbonate, potassium carbonate or ammonium carbonate.

[0029] (2) Preparation of sodium nicosulfuron: Nicosulfuron is mixed evenly with sodium source, water is added to granulate, and particles with a particle size of 0.4 mm-3.0 mm are made. After boiling and drying, sodium nicosulfuron particles are obtained; wherein, sodium source is sodium carbonate, sodium hydroxide or sodium methoxide.

[0030] (3) Mix the chlorpyrifos, nicosulfuron, sodium nicosulfuron, sodium polyacrylate, methylnaphthalene sulfonate formaldehyde condensate, fatty alcohol sulfonate and / or fatty alcohol sulfate and filler evenly, and then perform air jet milling to make a powder with a particle size of 10-15 μm.

[0031] (4) Spray the powder obtained in step (3) into water, knead it, granulate it, and then dry it to obtain the final product.

[0032] For the purposes of this invention, in step (1), the weight ratio of chlorpyrifos to sodium carbonate is 100:25-30, preferably 100:26; the weight ratio of chlorpyrifos to sodium carbonate is 100:34-40, preferably 100:35; and the weight ratio of chlorpyrifos to potassium carbonate is 100:25-30, preferably 100:27. The parameters for fluidized bed drying are as follows: inlet air temperature is 60-80℃, and the moisture content of the discharged product is maintained at 1.5-5%.

[0033] For the present invention, in step (2), the weight ratio of nicosulfuron to sodium carbonate is 100:13-15, preferably 100:14; the weight ratio of nicosulfuron to sodium hydroxide is 100:10-12, preferably 100:11; the weight ratio of nicosulfuron to sodium methoxide is 100:13-15, preferably 100:14; the parameters for boiling drying are as follows: the inlet air temperature is 60-80℃, and the moisture content of the discharged product is maintained at 1.5-5%.

[0034] For the present invention, in step (3), the parameters of airflow pulverization are as follows: the pulverization inlet air temperature is 10-25℃ and the pressure is 0.8-1.0MPa.

[0035] For the present invention, in step (4), the granulation parameters are as follows: the granulation temperature is 20-45℃; the diameter of the obtained particles is 0.4mm-2.0mm; during drying, the air inlet temperature is 50-85℃, and the moisture content of the output product is maintained at 0.8-1.5%.

[0036] The advantages of using the technical solution of this invention are as follows:

[0037] This invention provides a multi-component water-dispersible granule for corn fields, which is a water-dispersible granule made by compounding chlorpyrifos, mesotrione and nicosulfuron salt. It has good control effect, stable physical and chemical properties, and is not easy to decompose and deteriorate to cause phytotoxicity. The suspension rate reaches more than 96%. In the process of use, only one dispersion is required, and the application process is simple. The water-dispersible granule is a granular solid with good flowability. After pouring, it does not stick to the wall and will not leave residue in the packaging container to cause secondary pollution. Detailed Implementation

[0038] The present invention can be better understood from the following embodiments. However, those skilled in the art will readily understand that the descriptions in the embodiments are for illustrative purposes only and should not, and will not, limit the invention as detailed in the claims.

[0039] Example 1

[0040] A multi-component water-dispersible granule for cornfields, comprising the following components in parts by weight:

[0041]

[0042] in,

[0043] The preparation of sodium chlorpyrifos includes the following steps:

[0044] Mix 100 parts of chlorpyrifos and 26 parts of sodium carbonate evenly. After mixing, spray in 15 parts of water and knead. Add the mixture to an extrusion granulator for granulation to produce particles with a diameter of 0.4 mm to 3.0 mm. The obtained particles are then subjected to boiling drying with an inlet air temperature of 60-80℃. Maintain the moisture content of the output product at 1.5-5%. Collect the dried particles to obtain sodium chlorpyrifos salt particles with a yield of 88% and a moisture content of 3.0%.

[0045] The preparation of nicosulfuron sodium salt includes the following steps:

[0046] Mix 100 parts of nicosulfuron and 14 parts of sodium carbonate evenly. After mixing, spray in 15 parts of water and knead. Add the mixture to an extrusion granulator for granulation to produce granules with a diameter of 0.4 mm to 3.0 mm. The resulting granules are then subjected to fluidized bed drying with an inlet air temperature of 60-80℃. Maintain the moisture content of the output product at 1.5-5%. Collect the dried granules to obtain nicosulfuron sodium salt granules with a yield of 90% and a moisture content of 3.0%.

[0047] The preparation method of the above-mentioned water-dispersible granules includes the following steps:

[0048] (1) Sodium chlorpyrifos, nicosulfuron, sodium nicosulfuron and adjuvants (sodium polyacrylate, methylnaphthalene sulfonate formaldehyde condensate, fatty alcohol sulfonate, sodium carbonate and corn starch) are mixed for 20 minutes. The resulting mixture is added to a double helix mixer (Ⅰ) and pulverized by an air jet mill while being mixed. The inlet air temperature for pulverization is 10-25℃ and the pressure is 0.8-1.0MPa. The mixture is collected by a cyclone separator and a bag filter. It is then mixed again in a double helix mixer (Ⅱ) to obtain a uniform powder with a particle size of 10-15μm for the solid particles in the powder.

[0049] (2) Add the powder obtained in step (1) to the kneader, spray water, and then pour it into the granulator for granulation. The granulation temperature is 20-45℃, and the particle size of the wet granules is 0.4-2.0mm. Then dry it, and the air inlet temperature is 50-85℃. Then sieve it to obtain columnar uniform granules. Control the moisture content at 1.0% to obtain water-dispersible granules. Measure and package them.

[0050] Example 2

[0051] A multi-component water-dispersible granule for cornfields, comprising the following components in parts by weight:

[0052]

[0053] in,

[0054] The preparation of sodium chlorpyrifos includes the following steps:

[0055] Mix 100 parts of chlorpyrifos and 35 parts of potassium carbonate evenly. After mixing, spray in 15 parts of water and knead. Add the mixture to an extrusion granulator for granulation to produce particles with a diameter of 0.4 mm to 3.0 mm. The resulting particles are then subjected to boiling drying with an inlet air temperature of 60-80℃. Maintain the moisture content of the output product at 1.5-5%. Collect the dried particles to obtain sodium chlorpyrifos granules with a yield of 85% and a moisture content of 2.8%.

[0056] The preparation of nicosulfuron sodium salt includes the following steps:

[0057] Mix 100 parts of nicosulfuron and 11 parts of sodium hydroxide evenly. After mixing, spray in 15 parts of water and knead. Add the mixture to an extrusion granulator for granulation to produce granules with a diameter of 0.4 mm to 3.0 mm. The resulting granules are then subjected to boiling drying with an inlet air temperature of 60-80℃. Maintain the moisture content of the output product at 1.5-5%. Collect the dried granules to obtain sodium nicosulfuron salt granules with a yield of 92% and a moisture content of 2.0%.

[0058] The preparation method of the above-mentioned water-dispersible granules includes the following steps:

[0059] (1) Mix potassium chlorpyrifos, nicosulfuron, sodium nicosulfuron and adjuvants (sodium polyacrylate, methylnaphthalene sulfonate formaldehyde condensate, fatty alcohol sulfonate, sodium carbonate and corn starch) for 20 minutes. Add the resulting mixture to a double helix mixer (Ⅰ) and pulverize it while mixing. The pulverizing air inlet temperature is 10-25℃ and the pressure is 0.8-1.0MPa. The mixture is collected by a cyclone separator and a bag filter. It is then mixed again in a double helix mixer (Ⅱ) to obtain a uniform powder with a particle size of 10-15μm for the solid particles.

[0060] (2) Add the powder obtained in step (1) to the kneader, spray water, and then pour it into the granulator for granulation. The granulation temperature is 20-45℃, and the particle size of the wet granules is 0.4-2.0mm. Then dry it, and the air inlet temperature is 50-85℃. Then sieve it to obtain columnar uniform granules. Control the moisture content at 1.2% to obtain water-dispersible granules. Measure and package them.

[0061] Example 3

[0062] A multi-component water-dispersible granule for cornfields, comprising the following components in parts by weight:

[0063]

[0064] in,

[0065] The preparation of sodium chlorpyrifos includes the following steps:

[0066] 100 parts of chlorpyrifos and 27 parts of ammonium carbonate were mixed evenly. After mixing, 15 parts of water were sprayed in and kneaded. The mixture was then added to an extrusion granulator for granulation to produce particles with a diameter of 0.4 mm to 3.0 mm. The resulting particles were then subjected to fluidized bed drying with an inlet air temperature of 60-80℃, maintaining the moisture content of the output product at 1.5-5%. The dried particles were collected to obtain sodium chlorpyrifos granules with a yield of 87% and a moisture content of 3.2%.

[0067] The preparation of nicosulfuron sodium salt includes the following steps:

[0068] Mix 100 parts of nicosulfuron and 14 parts of sodium methoxide evenly. After mixing, spray in 15 parts of water and knead. Add the mixture to an extrusion granulator for granulation to produce particles with a diameter of 0.4 mm to 3.0 mm. The obtained particles are then subjected to fluidized bed drying with an inlet air temperature of 60-80℃. Maintain the moisture content of the output product at 1.5-5%. Collect the dried particles to obtain sodium nicosulfuron salt particles with a yield of 93% and a moisture content of 2.1%.

[0069] The preparation method of the above-mentioned water-dispersible granules includes the following steps:

[0070] (1) Mix ammonium chlorpyrifos, nicosulfuron, sodium nicosulfuron and adjuvants (sodium polyacrylate, methylnaphthalene sulfonate formaldehyde condensate, fatty alcohol sulfonate, sodium carbonate and corn starch) for 20 minutes. Add the resulting mixture to a double helix mixer (Ⅰ) and pulverize it while mixing. The pulverizing air inlet temperature is 10-25℃ and the pressure is 0.8-1.0MPa. The mixture is collected by a cyclone separator and a bag filter. It is then mixed again in a double helix mixer (Ⅱ) to obtain a uniform powder with a particle size of 10-15μm for the solid particles.

[0071] (2) Add the powder obtained in step (1) to the kneader, spray water, and then pour it into the granulator for granulation. The granulation temperature is 20-45℃, and the particle size of the wet granules is 0.4-2.0mm. Then dry it, and the air inlet temperature is 50-85℃. Then sieve it to obtain columnar uniform granules. Control the moisture content at 1.3% to obtain water-dispersible granules. Measure and package them.

[0072] Example 4

[0073] A multi-component water-dispersible granule for cornfields, comprising the following components in parts by weight:

[0074]

[0075] in,

[0076] The preparation of sodium chlorpyrifos includes the following steps:

[0077] Mix 100 parts of chlorpyrifos and 26 parts of sodium carbonate evenly. After mixing, spray in 15 parts of water and knead. Add the mixture to an extrusion granulator for granulation to produce particles with a diameter of 0.4 mm to 3.0 mm. The obtained particles are then subjected to boiling drying with an inlet air temperature of 60-80℃. Maintain the moisture content of the output product at 1.5-5%. Collect the dried particles to obtain sodium chlorpyrifos salt particles with a yield of 88% and a moisture content of 3.0%.

[0078] The preparation of nicosulfuron sodium salt includes the following steps:

[0079] Mix 100 parts of nicosulfuron and 14 parts of sodium carbonate evenly. After mixing, spray in 15 parts of water and knead. Add the mixture to an extrusion granulator for granulation to produce granules with a diameter of 0.4 mm to 3.0 mm. The resulting granules are then subjected to fluidized bed drying with an inlet air temperature of 60-80℃. Maintain the moisture content of the output product at 1.5-5%. Collect the dried granules to obtain nicosulfuron sodium salt granules with a yield of 90% and a moisture content of 3.0%.

[0080] The preparation method of the above-mentioned water-dispersible granules includes the following steps:

[0081] (1) Sodium chlorpyrifos, nicosulfuron, sodium nicosulfuron and adjuvants (sodium polyacrylate, methylnaphthalene sulfonate formaldehyde condensate, fatty alcohol sulfate, sodium carbonate and corn starch) are mixed for 20 minutes. The resulting mixture is added to a double helix mixer (Ⅰ) and pulverized by an air jet mill while being mixed. The inlet air temperature for pulverization is 10-25℃ and the pressure is 0.8-1.0MPa. The mixture is collected by a cyclone separator and a bag filter. It is then mixed again in a double helix mixer (Ⅱ) to obtain a uniform powder with a particle size of 10-15μm for the solid particles in the powder.

[0082] (2) Add the powder obtained in step (1) to the kneader, spray water, and then pour it into the granulator for granulation. The granulation temperature is 20-45℃, and the particle size of the wet granules is 0.4-2.0mm. Then dry it, and the air inlet temperature is 50-85℃. Then sieve it to obtain columnar uniform granules. Control the moisture content at 1.0% to obtain water-dispersible granules. Measure and package them.

[0083] Example 5

[0084] A multi-component water-dispersible granule for cornfields, comprising the following components in parts by weight:

[0085]

[0086] in,

[0087] The preparation of sodium chlorpyrifos includes the following steps:

[0088] Mix 100 parts of chlorpyrifos and 35 parts of potassium carbonate evenly. After mixing, spray in 15 parts of water and knead. Add the mixture to an extrusion granulator for granulation to produce particles with a diameter of 0.4 mm to 3.0 mm. The resulting particles are then subjected to boiling drying with an inlet air temperature of 60-80℃. Maintain the moisture content of the output product at 1.5-5%. Collect the dried particles to obtain sodium chlorpyrifos granules with a yield of 85% and a moisture content of 2.8%.

[0089] The preparation of nicosulfuron sodium salt includes the following steps:

[0090] Mix 100 parts of nicosulfuron and 11 parts of sodium hydroxide evenly. After mixing, spray in 15 parts of water and knead. Add the mixture to an extrusion granulator for granulation to produce granules with a diameter of 0.4 mm to 3.0 mm. The resulting granules are then subjected to boiling drying with an inlet air temperature of 60-80℃. Maintain the moisture content of the output product at 1.5-5%. Collect the dried granules to obtain sodium nicosulfuron salt granules with a yield of 92% and a moisture content of 2.0%.

[0091] The preparation method of the above-mentioned water-dispersible granules includes the following steps:

[0092] (1) Mix potassium chlorpyrifos, nicosulfuron, sodium nicosulfuron and adjuvants (sodium polyacrylate, methylnaphthalene sulfonate formaldehyde condensate, fatty alcohol sulfate, sodium carbonate and corn starch) for 20 minutes. Add the resulting mixture to a double helix mixer (Ⅰ) and pulverize it while mixing. The pulverizing air inlet temperature is 10-25℃ and the pressure is 0.8-1.0MPa. The mixture is collected by a cyclone separator and a bag filter. It is then mixed again in a double helix mixer (Ⅱ) to obtain a uniform powder with a particle size of 10-15μm for the solid particles.

[0093] (2) Add the powder obtained in step (1) to the kneader, spray water, and then pour it into the granulator for granulation. The granulation temperature is 20-45℃, and the particle size of the wet granules is 0.4-2.0mm. Then dry it, and the air inlet temperature is 50-85℃. Then sieve it to obtain columnar uniform granules. Control the moisture content at 1.0% to obtain water-dispersible granules. Measure and package them.

[0094] Example 6

[0095] A multi-component water-dispersible granule for cornfields, comprising the following components in parts by weight:

[0096]

[0097] in,

[0098] The preparation of sodium chlorpyrifos includes the following steps:

[0099] 100 parts of chlorpyrifos and 27 parts of ammonium carbonate were mixed evenly. After mixing, 15 parts of water were sprayed in and kneaded. The mixture was then added to an extrusion granulator for granulation to produce particles with a diameter of 0.4 mm to 3.0 mm. The resulting particles were then subjected to fluidized bed drying with an inlet air temperature of 60-80℃, maintaining the moisture content of the output product at 1.5-5%. The dried particles were collected to obtain sodium chlorpyrifos granules with a yield of 87% and a moisture content of 3.2%.

[0100] The preparation of nicosulfuron sodium salt includes the following steps:

[0101] Mix 100 parts of nicosulfuron and 14 parts of sodium methoxide evenly. After mixing, spray in 15 parts of water and knead. Add the mixture to an extrusion granulator for granulation to produce particles with a diameter of 0.4 mm to 3.0 mm. The obtained particles are then subjected to fluidized bed drying with an inlet air temperature of 60-80℃. Maintain the moisture content of the output product at 1.5-5%. Collect the dried particles to obtain sodium nicosulfuron salt particles with a yield of 93% and a moisture content of 2.1%.

[0102] The preparation method of the above-mentioned water-dispersible granules includes the following steps:

[0103] (1) Mix ammonium chlorpyrifos, nicosulfuron, sodium nicosulfuron and adjuvants (sodium polyacrylate, methylnaphthalene sulfonate formaldehyde condensate, fatty alcohol sulfate, sodium carbonate and corn starch) for 20 minutes. Add the resulting mixture to a double helix mixer (Ⅰ) and pulverize it while mixing. The pulverizing air inlet temperature is 10-25℃ and the pressure is 0.8-1.0MPa. The mixture is collected by a cyclone separator and a bag filter. It is then mixed again in a double helix mixer (Ⅱ) to obtain a uniform powder with a particle size of 10-15μm for the solid particles.

[0104] (2) Add the powder obtained in step (1) to the kneader, spray water, and then pour it into the granulator for granulation. The granulation temperature is 20-45℃, and the particle size of the wet granules is 0.4-2.0mm. Then dry it, and the air inlet temperature is 50-85℃. Then sieve it to obtain columnar uniform granules. Control the moisture content at 1.0% to obtain water-dispersible granules. Measure and package them.

[0105] Comparative Example 1

[0106] A multi-component water-dispersible granule for cornfields, comprising the following components in parts by weight:

[0107]

[0108] in,

[0109] The preparation method of the above-mentioned water-dispersible granules includes the following steps:

[0110] (1) Mix chlorpyrifos, mesotrione, nicosulfuron and adjuvants (sodium polyacrylate, methylnaphthalene sulfonate formaldehyde condensate, fatty alcohol sulfonate, sodium carbonate and corn starch) for 20 minutes. Add the resulting mixture to a double helix mixer (Ⅰ) and pulverize it while mixing. The pulverizing air inlet temperature is 10-25℃ and the pressure is 0.8-1.0MPa. Collect the mixture through a cyclone separator and a bag filter. Mix it again in a double helix mixer (Ⅱ) to obtain a uniform powder with a particle size of 10-15μm for the solid particles in the powder.

[0111] (2) Add the powder obtained in step (1) to the kneader, spray water, and then pour it into the granulator for granulation. The granulation temperature is 20-45℃, and the particle size of the wet granules is 0.4-2.0mm. Then dry it, and the air inlet temperature is 50-85℃. Then sieve it to obtain columnar uniform granules. Control the moisture content at 1.0% to obtain water-dispersible granules. Measure and package them.

[0112] Comparative Example 2

[0113] A multi-component water-dispersible granule for cornfields, comprising the following components in parts by weight:

[0114]

[0115] in,

[0116] The preparation method of the above-mentioned water-dispersible granules includes the following steps:

[0117] (1) Mix chlorpyrifos, mesotrione, nicosulfuron and adjuvants (sodium polyacrylate, methylnaphthalene sulfonate formaldehyde condensate, fatty alcohol sulfonate, sodium carbonate and corn starch) for 20 minutes. Add the resulting mixture to a double helix mixer (Ⅰ) and pulverize it while mixing. The pulverizing air inlet temperature is 10-25℃ and the pressure is 0.8-1.0MPa. Collect the mixture through a cyclone separator and a bag filter. Mix it again in a double helix mixer (Ⅱ) to obtain a uniform powder with a particle size of 10-15μm for the solid particles in the powder.

[0118] (2) Add the powder obtained in step (1) to the kneader, spray water, and then pour it into the granulator for granulation. The granulation temperature is 20-45℃, and the particle size of the wet granules is 0.4-2.0mm. Then dry it, and the air inlet temperature is 50-85℃. Then sieve it to obtain columnar uniform granules. Control the moisture content at 1.0% to obtain water-dispersible granules. Measure and package them.

[0119] Results data:

[0120] The water-dispersible granules prepared by compounding chlorpyrifos (sodium, potassium and ammonium salts), mesotrione and nicosulfuron salt (sodium salt) in the examples (Examples 1-6), Comparative Examples 1 and 2, and commercially available 4 g / L nicosulfuron OD (Comparative Example 3), 24% chlorpyrifos SL (Comparative Example 4) and 100 g / L mesotrione OD (Comparative Example 5) were tested on corn for weed control. The specific test results are shown in Table 1.

[0121] Table 1 Weed Control Effectiveness Data

[0122]

[0123] As shown in Table 1, the water-dispersible granules prepared in the embodiments of the present invention have a significant synergistic effect compared with the comparative examples and single-agent products on the market. The weeding effect is about 40-50% higher in grasses and about 200% higher in broadleaf weeds.

[0124] The water-dispersible granules prepared by compounding chlorpyrifos (sodium, potassium and ammonium salts), mesotrione and nicosulfuron salt (sodium salt) in the examples (Examples 1-6), and the water-dispersible granules prepared by compounding chlorpyrifos, mesotrione and nicosulfuron in Comparative Examples 1 and 2 were subjected to physicochemical stability tests. The specific test results are shown in Tables 2-4.

[0125] Table 2 Physicochemical stability test data

[0126]

[0127] Table 3 Physicochemical stability test data

[0128]

[0129]

[0130] Table 4 Physicochemical stability test data

[0131]

[0132] As can be seen from Tables 2-4, the water-dispersible granules prepared in the embodiments of the present invention have a higher suspension rate than the water-dispersible granules prepared in the comparative examples, and the suspension effect is not affected even when stored at 54°C.

[0133] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications may still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions may be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A multi-component water-dispersible granule for cornfields, characterized in that, The water-dispersible granules comprise the following components in parts by weight: 5-20 parts of chlorpyrifos, 25-45 parts of nicosulfuron, 10-30 parts of nicosulfuron salt, 3-10 parts of sodium polyacrylate, 3-10 parts of methylnaphthalenesulfonate formaldehyde condensate, 1-10 parts of fatty alcohol sulfonate and / or fatty alcohol sulfate, and 5-30 parts of filler; wherein the chlorpyrifos is sodium chlorpyrifos, potassium chlorpyrifos, or ammonium chlorpyrifos; the nicosulfuron salt is sodium nicosulfuron; and the filler is corn starch and / or sodium carbonate.

2. The multi-component water-dispersible granule for cornfields according to claim 1, characterized in that, In its preparation process, chlorpyrifos, mesotrione, sodium nicosulfuron, sodium polyacrylate, methylnaphthalene sulfonate formaldehyde condensate, fatty alcohol sulfonate and / or fatty alcohol sulfate and filler are mixed evenly. After mixing, the mixture is air-jet pulverized to produce a powder with a particle size of 10-15μm. The resulting powder is sprayed with water, kneaded, granulated and dried to obtain water-dispersible granules.

3. The multi-component water-dispersible granule for cornfields according to claim 2, characterized in that, The preparation of the chlorpyrifos salt includes the following steps: chlorpyrifos acid and carbonate are mixed evenly, water is added to granulate the mixture to form particles with a particle size of 0.4 mm to 3.0 mm, and the obtained particles are boiled and dried to obtain chlorpyrifos salt particles; wherein the carbonate is sodium carbonate, potassium carbonate or ammonium carbonate.

4. The multi-component water-dispersible granule for cornfields according to claim 3, characterized in that, The weight ratio of chlorpyrifos to sodium carbonate is 100:25-30, preferably 100:26; the weight ratio of chlorpyrifos to potassium carbonate is 100:34-40, preferably 100:35; the weight ratio of chlorpyrifos to ammonium carbonate is 100:25-30, preferably 100:27; the parameters for fluidized bed drying are as follows: the inlet air temperature is 60-80℃, and the moisture content of the discharged product is maintained at 1.5-5%.

5. The multi-component water-dispersible granule for cornfields according to claim 2, characterized in that, The preparation of the sodium nicosulfuron salt includes the following steps: mixing nicosulfuron with a sodium source evenly, adding water to granulate, and making particles with a particle size of 0.4 mm-3.0 mm. After boiling and drying the obtained particles, sodium nicosulfuron salt particles are obtained; wherein, the sodium source is sodium carbonate, sodium hydroxide or sodium methoxide.

6. The multi-component water-dispersible granule for cornfields according to claim 5, characterized in that, The weight ratio of nicosulfuron to sodium carbonate is 100:13-15, preferably 100:14; the weight ratio of nicosulfuron to sodium hydroxide is 100:10-12, preferably 100:11; the weight ratio of nicosulfuron to sodium methoxide is 100:13-15, preferably 100:14; the parameters for fluidized bed drying are as follows: the inlet air temperature is 60-80℃, and the moisture content of the discharged product is maintained at 1.5-5%.

7. The multi-component water-dispersible granule for cornfields according to claim 2, characterized in that, The water-dispersible granules comprise the following components in parts by weight: 12-15 parts of chlorpyrifos, 32-35 parts of nicosulfuron, 16-20 parts of sodium nicosulfuron, 5-8 parts of sodium polyacrylate, 5-7 parts of methylnaphthalene sulfonate formaldehyde condensate, 3-5 parts of fatty alcohol sulfonate and / or fatty alcohol sulfate, 5-6 parts of sodium carbonate, and 4-15 parts of corn starch; preferably, the water-dispersible granules comprise the following components in parts by weight: 12 parts of sodium chlorpyrifos, 32 parts of nicosulfuron, 16 parts of sodium nicosulfuron, 5 parts of sodium polyacrylate, 5 parts of methylnaphthalene sulfonate formaldehyde condensate, 5 parts of fatty alcohol sulfonate, 5 parts of sodium carbonate, and 15 parts of corn starch. 12 parts of potassium chlorpyrifos, 32 parts of nicosulfuron, 16 parts of sodium nicosulfuron, 5 parts of sodium polyacrylate, 5 parts of methylnaphthalene sulfonate formaldehyde condensate, 5 parts of fatty alcohol sulfonate, 5 parts of sodium carbonate, and 15 parts of corn starch. 12 parts of ammonium chlorpyrifos, 32 parts of nicosulfuron, 16 parts of sodium nicosulfuron, 5 parts of sodium polyacrylate, 5 parts of methylnaphthalene sulfonate formaldehyde condensate, 5 parts of fatty alcohol sulfonate, 5 parts of sodium carbonate, and 15 parts of corn starch. 15 parts of sodium chlorpyrifos, 35 parts of nicosulfuron, 20 parts of sodium nicosulfuron, 7 parts of sodium polyacrylate, 8 parts of methylnaphthalenesulfonate formaldehyde condensate, 3 parts of fatty alcohol sulfate, 6 parts of sodium carbonate, and 4 parts of corn starch. 15 parts of potassium chlorpyrifos, 35 parts of nicosulfuron, 20 parts of sodium nicosulfuron, 7 parts of sodium polyacrylate, 8 parts of methylnaphthalenesulfonate formaldehyde condensate, 3 parts of fatty alcohol sulfate, 6 parts of sodium carbonate, and 4 parts of corn starch. 15 parts of ammonium chlorpyrifos, 35 parts of nicosulfuron, 20 parts of sodium nicosulfuron, 7 parts of sodium polyacrylate, 8 parts of methylnaphthalenesulfonate formaldehyde condensate, 3 parts of fatty alcohol sulfate, 6 parts of sodium carbonate, and 4 parts of corn starch.

8. The method for preparing the multi-component water-dispersible granules for cornfields according to claim 1, characterized in that, Includes the following steps: (1) Preparation of chlorpyridinic acid: Chlorpyridinic acid and carbonate are mixed evenly, water is added and granulation is carried out to form particles with a particle size of 0.4 mm-3.0 mm. After boiling and drying, chlorpyridinic acid particles are obtained; wherein the carbonate is sodium carbonate, potassium carbonate or ammonium carbonate. (2) Preparation of sodium nicosulfuron: Nicosulfuron is mixed evenly with a sodium source, water is added to granulate, and particles with a particle size of 0.4 mm-3.0 mm are prepared. After boiling and drying, sodium nicosulfuron particles are obtained; wherein, the sodium source is sodium carbonate, sodium hydroxide or sodium methoxide. (3) Mix the chlorpyrifos, nicosulfuron, sodium nicosulfuron, sodium polyacrylate, methylnaphthalene sulfonate formaldehyde condensate, fatty alcohol sulfonate and / or fatty alcohol sulfate and filler evenly, and then perform air jet milling to make a powder with a particle size of 10-15 μm. (4) Spray the powder obtained in step (3) into water, knead it, granulate it, and then dry it to obtain the final product.

9. The method for preparing the multi-component water-dispersible granules for cornfields according to claim 8, characterized in that, In step (1), the weight ratio of chlorpyrifos to sodium carbonate is 100:25-30, preferably 100:26; the weight ratio of chlorpyrifos to sodium carbonate is 100:34-40, preferably 100:35; the weight ratio of chlorpyrifos to potassium carbonate is 100:25-30, preferably 100:27; in step (2), the weight ratio of nicosulfuron to sodium carbonate is 100:13-15, preferably 100:14; the weight ratio of nicosulfuron to sodium hydroxide is 100:10-12, preferably 100:11; the weight ratio of nicosulfuron to sodium methoxide is 100:13-15, preferably 100:14; in steps (1) and (2), the parameters for boiling drying are as follows: the inlet air temperature is 60-80℃, and the moisture content of the discharged product is maintained at 1.5-5%.

10. The method for preparing the multi-component water-dispersible granules for cornfields according to claim 8, characterized in that, In step (3), the parameters for air jet milling are as follows: the inlet air temperature for milling is 10-25℃, and the pressure is 0.8-1.0MPa; in step (4), the parameters for granulation are as follows: the granulation temperature is 20-45℃; the diameter of the resulting particles is 0.4mm-2.0mm; during drying, the inlet air temperature is 50-85℃, and the moisture content of the output product is maintained at 0.8-1.5%.

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