High performance cypermethrin micro-capsule emulsion
A technology of high-efficiency cypermethrin and microcapsule suspending agent, which is applied in biocides, biocides, animal repellents, etc., can solve the problems of less application, achieve safe storage and transportation, easy control, and improve the effective utilization rate
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Embodiment 1
[0029] Add urea and formaldehyde into a three-necked flask equipped with a thermometer and a stirring device, the molar ratio is 1:2.0, after dissolving, add deionized water twice the weight of formaldehyde and urea, adjust the pH value to 8.5 with triethanolamine, and raise the temperature to 70 °C, stirring at low speed for 1 hour to obtain an aqueous solution of urea-formaldehyde resin prepolymer.
[0030] Under normal temperature, 2.6g 97% beta-cypermethrin former drug is completely dissolved in 4.0g xylene, while stirring, add 5g of the above-mentioned urea-formaldehyde resin prepolymer aqueous solution, and add 7.5g 5% sodium polyacrylate aqueous solution, stir at 1500 rpm Form a stable O / W emulsion; reduce the speed to 800 rpm, add 1M hydrochloric acid in 5 batches within 60 minutes to adjust the pH of the system to 2.0, and polycondense for 1 hour; then increase the temperature to 45°C to solidify the capsule wall for 1.5 hours before adding Adjust the pH to 7.0 with s...
Embodiment 2
[0032] Add urea and formaldehyde into a three-necked flask equipped with a thermometer and a stirring device, the molar ratio is 1:2.0, after dissolving, add deionized water twice the weight of formaldehyde and urea, adjust the pH value to 8.5 with triethanolamine, and raise the temperature to 70 °C, stirring at low speed for 1 hour to obtain an aqueous solution of urea-formaldehyde resin prepolymer.
[0033] Dissolve 5.2g 97% beta-cypermethrin technical substance completely in 5.0g toluene at normal temperature, add 7.5g above-mentioned urea-formaldehyde resin prepolymer aqueous solution while stirring, and add 10g 5% sodium polyacrylate aqueous solution, stir at 1500 rpm to form Stable O / W emulsion; reduce the speed to 800 rpm, add 1M hydrochloric acid in 5 batches within 60 minutes to adjust the pH of the system to 2.0, and polycondense for 1 hour; then raise the temperature to 45°C to solidify the capsule wall for 2 hours and then add hydrogen Adjust the pH to 7.0 with sod...
Embodiment 3
[0035]Add urea and formaldehyde into a three-necked flask equipped with a thermometer and a stirring device, the molar ratio is 1:2.5, after dissolving, add deionized water twice the weight of formaldehyde and urea, adjust the pH value to 8.5 with triethanolamine, and raise the temperature to 70 °C, stirring at low speed for 1 hour to obtain an aqueous solution of urea-formaldehyde resin prepolymer.
[0036] Under normal temperature, 10.4g 97% beta-cypermethrin active drug is completely dissolved in 6.0g benzene, while stirring, add 15g of the above-mentioned urea-formaldehyde resin prepolymer aqueous solution, and add 20g of 5% sodium polyacrylate aqueous solution, and stir at 1500 rpm to form a stable O / W emulsion; reduce the speed to 800 rpm, add 1M dilute hydrochloric acid in 5 batches within 60 minutes to adjust the pH of the system to 2.0, and polycondense for 1.5 hours; then raise the temperature to 50°C to solidify the capsule wall for 2 hours and then add hydrogen Adj...
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