Water dispersible granule containing pyraclostrobin and preparation method thereof
A technology of pyraclostrobin and dispersible granules, applied in the directions of botanical equipment and methods, fungicides, biocides, etc., can solve the problems of unsatisfactory drug effect, adhesion or paste, low suspension rate, etc. The frequency of application, the prolongation of the action period, the effect of improving the dispersibility
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Embodiment 1
[0021] Example 1 Preparation of 5% pyraclostrobin water-dispersible granules
[0022] Step 1 Preparation of 20% pyraclostrobin microcapsules aqueous suspension
[0023] Heat 41.0g of pyraclostrobin technical material (98%) to 70°C±5°C and stir to melt, then add 0.8g of MR-200 (polymethylene polyphenylisocyanate) and mix evenly to prepare an oil phase, and 12.0 g Ultrazine NA (lignosulfonate) and 2.0g BY-125 (castor oil polyoxyethylene ether) were dissolved in 130g water and stirred to dissolve to prepare a water phase, and the oil phase was added to the water phase and sheared to prepare an average particle size 0.5μm~2.0μm O / W emulsion, then slowly add 2.0g of 10% diethylenetriamine aqueous solution to the emulsion under stirring, keep it at 70℃±5℃ for 1.0h, cool down to room temperature, adjust pH with appropriate amount of citric acid value of 5.0-7.0, make up 200.0 g with water to prepare 20% aqueous suspension of pyraclostrobin microcapsules, wherein the solid content is...
Embodiment 2
[0028] Example 2 Preparation of 20% pyraclostrobin water-dispersible granules
[0029] Step 1 Preparation of 30% pyraclostrobin microcapsules aqueous suspension
[0030] Heat 61.3g of pyraclostrobin technical material (98%) to 70°C±5°C and stir to melt, then add 3.0g of MondurMRS (polymethylene polyphenylisocyanate) and mix evenly to prepare an oil phase, and 10.0g of Borresperse NA (lignosulfonate) and 1.0g Tween-80 (polyoxyethylene sorbitan monooleate) were dissolved in 110g water and stirred to dissolve to prepare a water phase, and the oil phase was added to the water phase and sheared to prepare a O / W emulsion with an average particle size of 0.5μm-2.0μm, then slowly add 7.7g of 20% triethylenetetramine aqueous solution to the emulsion under stirring, keep it at 70°C±5°C for 1.0h, cool down to room temperature and add an appropriate amount of lemon The pH value was adjusted to 5.0-7.0 with acid, and 200.0 g of water was supplemented to prepare a 30% aqueous suspension of...
Embodiment 3
[0035] Example 3 Preparation of 50% pyraclostrobin water-dispersible granules
[0036] Step 1 Preparation of 50% pyraclostrobin microcapsules aqueous suspension
[0037] Heat 102.0g pyraclostrobin technical material (98%) to 70°C±5°C and stir to melt, then add 1.5g PM-200 (polymethylene polyphenyl isocyanate) and mix evenly to prepare an oil phase. Dissolve g 2700 (polycarboxylate) and 5.0g EL-80 (castor oil polyoxyethylene ether) in 100g water and stir to dissolve to prepare a water phase, add the oil phase to the water phase and shear to prepare an average particle size of 0.5 μm ~2.0μm O / W emulsion, then slowly add 1.3g of 50% hexamethylenediamine aqueous solution to the emulsion under stirring, keep it at 70℃±5℃ for 1.0h, cool down to room temperature, adjust the pH value to 5.0~ with an appropriate amount of citric acid 7.0, make up 200.0 g with water to prepare a 50% aqueous suspension of pyraclostrobin microcapsules, wherein the solid content is about 57.4%.
[0038] ...
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