Method for preparing water dispersible granules of pesticides

A technology of dispersing granules and pesticide water, applied in the fields of botanical equipment and methods, biocides, animal repellants, etc., can solve the problems of difficulty in forming continuous, automated processes, poor production workshop environment, and high labor intensity of workers, etc. Achieve the effect of low labor intensity, high suspension rate and large active surface

Inactive Publication Date: 2017-08-04
FIVESTAR NANTONG CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] The original drug is pulverized by a jet mill, the particle size of the active substance is still relatively large, generally 15-25um, and the biological activity is relatively low; it is difficult to form a continuous and automated process, and the labor intensity of the workers is high; the dust pollution is serious, Poor production workshop environment
[0013] It can be seen that there are certain defects in the existing wet and dry production processes of water-dispersible granules.

Method used

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  • Method for preparing water dispersible granules of pesticides
  • Method for preparing water dispersible granules of pesticides
  • Method for preparing water dispersible granules of pesticides

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] Figure 4 This is an example of the process flow of the pesticide water dispersible granule production line, in which one or two sets of sand mill and intermediate tank can be connected in series; the kneader can be a rake dryer and a negative pressure dehydration system is installed for further dehydration or direct separation without centrifugation. Concentrate under reduced pressure to a suitable moisture content for granulation.

[0047] The specific operation process is as follows: add the mother liquid separated in the previous batch and the supplementary fresh liquid into the shearing kettle, turn on the shearing kettle to stir, the air pump 1 and the vacuum feeder 1 pulse, and the gear pump 1 is used to assist the grinding of the liquid in sequence Use the vacuum feeder 1 to put solid grinding aids, solid pesticide technicals, fillers, etc. into the shearing kettle, start the external shearing machine to cut the material until the particle size is less than 150 mes...

Embodiment 2

[0054] Example 2: Production of 80% diuron water dispersible granules

[0055] Add 350kg of sand mill mother liquor separated in the previous batch and 110kg of fresh water into the shearing kettle. Turn on the shearing kettle to stir, air pump 1 and vacuum feeder 1 to pulse, and use gear pump 1 to reduce ethylene oxide-propylene oxide in sequence. 5.5kg of block copolymer, use vacuum feeder 1 to put 2.2kg of sodium dodecylbenzene sulfate, 27.4kg of kaolin, and 412.4kg of 97% diuron technical material into the shearing kettle, and start the external shearing machine cycle Cut the material to a particle size of less than 150 meshes, start the dispersion tank and stir, and put the material in the dispersion tank for sand grinding.

[0056] Start the horizontal sand mill, feed the above-mentioned materials into the sand mill through the diaphragm pump attached to the sand mill, adjust the flow rate of the diaphragm pump to ensure the slurry fineness D90 <5um, open the intermediate tan...

Embodiment 3

[0060] Example 3: Production of 80% carbendazim water dispersible granules

[0061] Add 350kg of sand mill mother liquor separated in the previous batch and 105kg of fresh water into the shearing kettle, turn on the shearing kettle to stir, air pump 1 and vacuum feeder 1 to pulse, and use gear pump 1 to ethylene oxide-propylene oxide in sequence Block copolymer 5.3kg, use the vacuum feeder 1 to put 2.1kg of sodium dodecylbenzene sodium sulfate and 408.2kg of 98% carbendazim original drug into the shearing kettle, and start the external shearing machine to cut the material to If the particle size is less than 150 meshes, start the dispersion tank and stir, and put the materials in the dispersion tank for sanding.

[0062] Start the horizontal sand mill, feed the above-mentioned materials into the sand mill through the diaphragm pump attached to the sand mill, adjust the flow rate of the diaphragm pump to ensure the slurry fineness D90 <5um, open the intermediate tank, stir in the mi...

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Abstract

The invention discloses a method for preparing water dispersible granules of pesticides. The preparation method disclosed by the invention comprises the following steps: performing sand grinding on raw pesticides and filling materials into suspension with the particle size of 5 microns or less by taking liquid and grinding aids as media, performing solid-liquid separation, mixing the solid phase and pesticide aids, functional aids and the filling materials, granulating, drying, and screening, thereby obtaining the water dispersible granules of pesticides, wherein the liquid-phase cycle is used for the grinding process. The active material prepared by the invention has the particle size of less than 5 microns, is large in active surface and high in suspension rate and has high biological activity; the preparation process in the invention is liquid-phase grinding, is dust-free and is a pipeline process, and a continuous and automatic production process can be formed.

Description

Technical field [0001] The invention relates to the technical field of formulations, in particular to a preparation method of pesticide water dispersible granules. Background technique [0002] Pesticide water dispersible granules are new formulations developed by Ciba-Geigy in Switzerland in the 1980s, and the sales volume has increased year by year since the mid-1980s. The appearance of the dosage form is granular, and the active ingredient is 60-90%. After being put into water and stirred, it can be evenly dispersed in the water like a wettable powder. Therefore, it has the characteristics of a wettable powder and emulsion. The finished product of dispersible granules has stable performance, no dust, good flow properties, can save packaging materials and costs, and is convenient for transportation and storage; application methods are flexible in application, can be applied by spraying or mixing soil; from the physical properties of the dosage form According to analysis, water...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A01N25/14A01N47/30A01N47/18A01N51/00A01N43/653A01N43/54
CPCA01N25/14A01N43/54A01N43/653A01N47/18A01N47/30A01N51/00A01N2300/00
Inventor 张惠明柳庆先张轶翔
Owner FIVESTAR NANTONG CHEM
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