Granulation method suitable for high altitude spraying of high density spherical pesticide granules

Abstract

The application discloses a granulation method of high-density spherical pesticide granules suitable for high-altitude spraying, characterized in that a pesticide raw material is uniformly mixed with a wetting agent, a dispersing agent, a disintegrating agent and a filler, the mixture is crushed by an air flow crusher to obtain a mother powder, the mother powder is sent into a high-speed granulator by a vacuum feeder, water is sprayed into the high-speed granulator at the same time, sugar-coated granulation is carried out, a boiling dryer is added to carry out drying, and the high-density spherical pesticide granules of the application are obtained. The granulation method of the high-density spherical pesticide granules is simple in process, low in equipment investment, and the obtained granules are round and uniform, and the method is convenient for popularization and promotion.

Description

Technical Field

[0001] This invention belongs to the field of pesticide formulations, specifically relating to a method for manufacturing high-density spherical granule formulations of pesticides such as herbicides, fungicides, and insecticides. Background Technology

[0002] Currently, emulsifiable concentrates, suspension concentrates, wettable powders, and granules dominate pesticide formulations. The development trend of new formulations is moving towards water-based, granular, slow-release, multifunctional, labor-saving, refined, and high-concentration formulations. Some highly efficient, safe, economical, and labor-saving formulations are emerging.

[0003] Granules are a new dosage form developed based on powders. They have many advantages: (1) They do not use organic solvents or generate dust, making them very safe for operators and the environment. This is the main reason why this dosage form is favored and developed rapidly in the United States and Europe. (2) Compared with powders, they have a higher content of active ingredients, which brings great economic and social benefits to packaging, storage and transportation. (3) They have good physicochemical stability and are not easily decomposed or deteriorated. (4) They can be packaged in paper, which is convenient for recycling, disposal or natural degradation.

[0004] The main granulation method for granules is extrusion granulation. The disadvantages of extrusion granulation are that the resulting columnar granules are of varying sizes and lack sufficient strength, making them prone to breakage during transportation. Additionally, they are easily broken during the landing of large aircraft spraying granules, causing dust dispersion and impacting the environment. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of the extrusion granulation method and propose a granulation method for high-density spherical pesticide granules that is simple in process, requires less equipment investment, produces large, uniform, and round granules, and is easy to popularize and promote.

[0006] The objective of this invention can be achieved through the following measures: A granulation method for high-density spherical pesticide granules suitable for high-altitude spraying is disclosed. The pesticide technical material is mixed evenly with wetting agents, dispersants, disintegrants, and fillers. The mixture is then pulverized using an air jet mill to obtain a 200-mesh master powder. A portion of the master powder is fed into a high-speed granulator via a vacuum feeder, while water is simultaneously sprayed in for granulation, resulting in spherical particles of 0.2-0.3 mm. The granules are then added to a coating machine with the remaining master powder added evenly, and sprayed to form granules, ultimately yielding 4-6 mm particles. The qualified particles are then dried in a fluidized bed dryer and sieved to obtain uniform, high-density spherical pesticide granules with a diameter of 4-6 mm.

[0007] In one approach, a two-stage granulation process is employed, where a high-speed granulator first produces masterbatch, which is then coated again in a sugar coating machine to obtain spherical particles.

[0008] In one formulation, the mass composition of the pesticide granules is as follows: pesticide technical 0.5-90%, dispersant 1-25%, disintegrant 1-20%, wetting agent 1-15%, and filler to make up to 100%.

[0009] In one approach, the active ingredient in a pesticide includes herbicides, fungicides, or insecticides.

[0010] In one embodiment, the dispersant comprises one or more of lignin sulfonate, alkyl sulfate, alkyl sulfonate, naphthalene sulfonic acid formaldehyde condensate, styrylphenol polyoxyethylene ether, alkyl aryl polyoxyethylene polyoxypropylene ether, alkyl aryl methyl ether resin polyoxyethylene ether, α-methyl benzyl polyoxyethylene ether, alkyl sulfonate anionic surfactant, and polyacrylate, with naphthalene sulfonic acid formaldehyde condensate and lignin sulfonate being preferred dispersants, and lignin sulfonate being the most preferred dispersant; the disintegrant comprises starch, inorganic salt, sodium carboxymethyl starch, and povidone, with sodium carboxymethyl starch or povidone being preferred disintegrants, and sodium carboxymethyl starch being the most preferred disintegrant.

[0011] In one embodiment, the wetting agent comprises one or more of alkyl sulfates, alkyl aryl polyoxyethylene polyoxypropylene ethers, alkyl aryl methyl ether resin polyoxyethylene ethers, alkyl sulfonate anionic surfactants, and phosphate ester anionic surfactants, preferably sodium dodecyl sulfate or sodium butylnaphthalene sulfonate, and most preferably sodium dodecyl sulfate.

[0012] In one embodiment, the filler includes one or more of bentonite, silica, attapulgite, kaolin, talc, and inorganic salts, preferably attapulgite.

[0013] In one embodiment, the rotational speed of the high-speed granulator is 100-300 rpm, with an optimal value of 150 rpm, and the water spraying speed is 5-30 L / min, with an optimal value of 100 L / min.

[0014] In one embodiment, the rotation speed of the coating machine is 20-60 rpm, with an optimal speed of 30 rpm, and the water spraying speed is 0.1-10 L / min, with an optimal speed of 2 L / min.

[0015] In one approach, a fluidized bed dryer is used in the drying process, with a drying temperature of 30–100°C, optimally 60–80°C.

[0016] The water-dispersible granules of this invention are produced by uniformly mixing pesticide technical material with wetting agent, dispersant, disintegrant, and filler, and then pulverizing the mixture into a powder of approximately 200 mesh using an air jet mill. A portion of the masterbatch powder is fed into a high-speed granulator via a vacuum feeder, while water is simultaneously sprayed in for granulation, resulting in spherical particles of 0.2-0.3 mm. These granules are then added to a coating machine with the masterbatch powder added evenly, and simultaneously sprayed to form granules, ultimately yielding particles of 4-6 mm. The qualified particles are then dried in a fluidized bed dryer and sieved to obtain the uniform, high-density spherical pesticide granules of this invention, with a diameter of 4-6 mm. The particles produced by this process exhibit good dispersibility, uniformity, high density, and are not easily broken. The bulk density is 0.8–1.6 g / cm³. Instruction manual illustrations Figure 1 This is a complete technical process roadmap. Detailed Implementation

[0017] Example 1: 20 kg of butisylform, 5 kg of lignin sulfonate, 5 kg of sodium carboxymethyl starch, 5 kg of sodium dodecyl sulfate, and 65 kg of attapulgite were mixed evenly and then pulverized to obtain a master powder. 2 kg of the master powder was added to a high-speed granulator at a rotation speed of 150 rpm, while 10 kg of water was sprayed in at a speed of 10 L / min. After the granulation was completed, the granulator was rotated for 10 minutes, and the cutter speed was maintained at 1000 rpm. The resulting master pellets were then added to a sugar coating machine at a rotation speed of 30 rpm. The master powder was added evenly while water was sprayed in at a speed of 0.2 L / min. The mixture was then put into a fluidized bed dryer and dried at 80℃ for 1 hour to obtain uniform 20% butisylform high-density spherical granules with a bulk density of 0.93 g / cm³.

[0018] Example 2: 5 kg of cycloazinone, 3 kg of lignin sulfonate, 1 kg of sodium carboxymethyl starch, 1 kg of sodium dodecyl sulfate, and 90 kg of attapulgite were mixed evenly and then pulverized to obtain master powder. 2 kg of the master powder was added to a high-speed granulator at a rotation speed of 150 rpm, while 10 kg of water was sprayed in at a speed of 10 L / min. After the granulation was completed, the granulator was rotated for 10 minutes, and the cutter speed was maintained at 1000 rpm. The resulting master pellets were then added to a sugar coating machine at a rotation speed of 30 rpm. The master powder was added evenly while water was sprayed in at a speed of 0.2 L / min. The mixture was then put into a fluidized bed dryer and dried at 80℃ for 1 hour to obtain uniform 5% cycloazinone high-density spherical granules with a bulk density of 1.11 g / cm³.

[0019] Example 3: Mix 2 kg of imidacloprid, 3 kg of lignin sulfonate, 1 kg of sodium carboxymethyl starch, 1 kg of sodium dodecyl sulfate, and 93 kg of attapulgite evenly, then pulverize them to obtain master powder. Add 2 kg of master powder to a high-speed granulator at a rotation speed of 150 rpm, while simultaneously spraying 10 kg of water at a speed of 10 L / min. After completion, rotate for 10 minutes, maintaining a cutter speed of 1000 rpm, and discharge the material. Add the resulting master pellets to a sugar coating machine at a rotation speed of 30 rpm, uniformly adding the master powder while simultaneously spraying water at a speed of 0.2 L / min. Then, put the mixture into a fluidized bed dryer for drying at 80℃ for 1 hour to obtain uniform 2% imidacloprid high-density spherical granules with a bulk density of 1.15 g / cm³.

[0020] Example 4: 3 kg of thiamethoxam, 3 kg of lignin sulfonate, 1 kg of sodium carboxymethyl starch, 1 kg of sodium dodecyl sulfate, and 92 kg of attapulgite were mixed evenly and then pulverized to obtain master powder. 2 kg of the master powder was added to a high-speed granulator at a rotation speed of 150 rpm, while 10 kg of water was sprayed in at a speed of 10 L / min. After the granulation was completed, the granulators were rotated for 10 minutes, and the cutter speed was maintained at 1000 rpm. The resulting master pellets were then added to a sugar coating machine at a rotation speed of 30 rpm. The master powder was added evenly while water was sprayed in at a speed of 0.2 L / min. The mixture was then put into a fluidized bed dryer and dried at 80℃ for 1 hour to obtain uniform 3% thiamethoxam high-density spherical granules with a bulk density of 1.12 g / cm³.

Claims

1. A granulation method for high-density spherical pesticide granules suitable for high-altitude spraying, characterized in that... The pesticide technical material is mixed evenly with wetting agent, dispersant, disintegrant, and filler. After being pulverized by an air jet mill, a 200-mesh master powder is obtained. Part of the master powder is fed into a high-speed granulator via a vacuum feeder, and water is sprayed in simultaneously for granulation, resulting in spherical particles of 0.2-0.3 mm. The granules are then added to a sugar coating machine, and the remaining master powder is added evenly. Simultaneously, spraying and rolling are performed to obtain 4-6 mm particles. The qualified particles are added to a fluidized bed dryer for drying, and then sieved to obtain uniform, high-density spherical pesticide granules with a diameter of 4-6 mm.

2. The granulation method for high-density spherical pesticides according to claim 1, characterized in that... The granulation process employs a two-stage granulation process. First, a high-speed granulator is used to create masterbatch, which is then coated again in a sugar coating machine to obtain spherical particles.

3. The granulation method for high-density spherical pesticides according to claim 1, characterized in that... The mass composition of pesticide granules is as follows: pesticide technical 0.5-90%, dispersant 1-25%, disintegrant 1-20%, wetting agent 1-15%, and filler to 100%.

4. The granulation method for high-density spherical pesticides according to claim 1, characterized in that... Pesticide technicals include herbicides, fungicides, or insecticides.

5. The granulation method for high-density spherical pesticides according to claim 1, characterized in that... The dispersant includes one or more of lignin sulfonate, alkyl sulfate, alkyl sulfonate, naphthalene sulfonic acid formaldehyde condensate, styrylphenol polyoxyethylene ether, alkyl aryl polyoxyethylene polyoxypropylene ether, alkyl aryl methyl ether resin polyoxyethylene ether, α-methyl benzyl polyoxyethylene ether, alkyl sulfonate anionic surfactant, and polyacrylate. The preferred dispersant is naphthalene sulfonic acid formaldehyde condensate or lignin sulfonate, and the most preferred dispersant is lignin sulfonate. The disintegrant includes starch, inorganic salt, sodium carboxymethyl starch, and povidone. The preferred disintegrant is one or more of sodium carboxymethyl starch or povidone, and the most preferred disintegrant is sodium carboxymethyl starch.

6. The granulation method for high-density spherical pesticides according to claim 1, characterized in that... The wetting agent includes one or more of alkyl sulfates, alkyl aryl polyoxyethylene polyoxypropylene ethers, alkyl aryl methyl ether resin polyoxyethylene ethers, alkyl sulfonate anionic surfactants, and phosphate ester anionic surfactants, preferably sodium dodecyl sulfate or sodium butylnaphthalene sulfonate, and most preferably sodium dodecyl sulfate.

7. The granulation method for high-density spherical pesticide granules according to claim 1, characterized in that... The filler includes one or more of bentonite, silica, attapulgite, kaolin, talc, and inorganic salts, with attapulgite being the preferred material.

8. The granulation method for high-density spherical pesticide granules according to claim 1, characterized in that... In a high-speed granulator, the rotation speed is 100-300 rpm, with an optimal speed of 150 rpm, and the water spray speed is 5-30 L / min, with an optimal speed of 100 L / min.

9. The granulation method for high-density spherical pesticide granules according to claim 1, characterized in that... In a sugar coating machine, the rotation speed is 20-60 rpm, with the optimal speed being 30 rpm, and the water spraying speed is 0.1-10 L / min, with the optimal speed being 2 L / min.

10. The granulation method for high-density spherical pesticide granules according to claim 1, characterized in that... A fluidized bed dryer is used in the drying process, with a drying temperature of 30–100℃, and the optimal temperature being 60–80℃.

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