Indoxacarb microcapsule suspension and preparation method thereof
A technology of microcapsule suspension and indoxacarb, which is applied in botany equipment and methods, insecticides, biocides, etc., can solve the problems of short duration and achieve long duration, pollution reduction, and human and animal safety Effect
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Embodiment 1
[0029] Example 1: 2% indoxacarb microcapsule suspension.
[0030] Preparation method of urea-formaldehyde resin prepolymer aqueous solution: dissolve urea into formaldehyde, the weight ratio of urea and formaldehyde is 1:2.5, adjust the pH value to 8 with sodium hydroxide, stir at a low speed at a temperature of 70°C, and keep warm for 1 hours, a viscous and transparent urea-formaldehyde resin is generated, and deionized water equal to the total weight of urea and formaldehyde is added, and stirred at a low speed to obtain a transparent urea-formaldehyde resin prepolymer aqueous solution.
[0031] Completely dissolve 2% indoxacarb in 5% xylene at room temperature, add 10% urea-formaldehyde resin prepolymer aqueous solution while stirring, and shear at 2000 rpm for 10 minutes to obtain a stable O / W emulsion. Reduce the rotation speed to 1000 rpm, add dilute hydrochloric acid in 5 batches within 1 hour to adjust the pH value to 2.0, polycondensation reaction occurs, gradually ra...
Embodiment 2
[0032] Example 2: 5% indoxacarb microcapsule suspension.
[0033] Preparation method of urea-formaldehyde resin prepolymer aqueous solution: dissolve urea into formaldehyde, the weight ratio of urea and formaldehyde is 1:2, adjust the pH value to 8.5 with sodium hydroxide, stir at a low speed at a temperature of 70°C, and keep warm for 1 hours, a viscous and transparent urea-formaldehyde resin is generated, and deionized water equal to the total weight of urea and formaldehyde is added, and stirred at a low speed to obtain a transparent urea-formaldehyde resin prepolymer aqueous solution.
[0034] Completely dissolve 5% indoxacarb in 10% xylene at room temperature, add 25% urea-formaldehyde resin prepolymer aqueous solution while stirring, and shear at 1500 rpm for 20 minutes to obtain a stable O / W emulsion. Reduce the rotation speed to 800 rpm, add dilute hydrochloric acid in 5 batches within 1 hour to adjust the pH value to 2.0, polycondensation reaction occurs, gradually ra...
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