Pendimethalin micro-capsule suspending agent and preparation method thereof
A pendimethalin microcapsule and pendimethalin technology, which is applied in the field of pesticides, can solve the problem of less varieties of pesticides, and achieve the effects of high market competitiveness, safe storage, transportation and use, and reduced toxicity
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Embodiment 1
[0023] Embodiment 1: 10% pendimethalin microcapsule suspension
[0024] Synthesis of urea-formaldehyde resin prepolymer: Add urea, formaldehyde and deionized water into a three-necked flask equipped with a thermometer and a stirring device, the molar ratio of urea to formaldehyde is 1:1.5, adjust the pH to 8.5 with triethanolamine, and raise the temperature to 70 ℃, stirring at low speed for 1 hour to obtain a clear and transparent aqueous solution of urea-formaldehyde resin prepolymer;
[0025] Preparation of microcapsule suspension: Dissolve 10g of pendimethalin in 3.5g of xylene at room temperature, add 5g of the above-mentioned urea-formaldehyde resin prepolymer aqueous solution and 0.5g of polyvinyl alcohol while stirring, and dissolve at 1500 rpm Stir and react at high speed for 1 hour, after the oil-in-water emulsion is formed, reduce the speed to 800 rpm, add hydrochloric acid solution in 5 batches within 60 minutes to adjust the pH value of the system to 2.0, and afte...
Embodiment 2
[0026] Embodiment 2: 20% pendimethalin microcapsule suspension
[0027] Synthesis of urea-formaldehyde resin prepolymer: Add urea, formaldehyde and deionized water into a three-necked flask equipped with a thermometer and a stirring device, the molar ratio of urea to formaldehyde is 1:2.0, adjust the pH to 8.5 with triethanolamine, and raise the temperature to 70 ℃, stirring at low speed for 1 hour to obtain a clear and transparent aqueous solution of urea-formaldehyde resin prepolymer;
[0028] Preparation of microcapsule suspension: Dissolve 20 g of pendimethalin in 7 g of xylene at room temperature, add 10 g of the above-mentioned urea-formaldehyde resin prepolymer aqueous solution and 0.5 g of gelatin while stirring, and react with high-speed stirring at 1500 rpm 1h, after the oil-in-water emulsion is formed, reduce the speed to 800 rpm, add hydrochloric acid solution in 5 batches within 60 minutes to adjust the pH value of the system to 2.0, and after the polymerization r...
Embodiment 3
[0029] Embodiment 3: 30% pendimethalin microcapsule suspension
[0030] Synthesis of urea-formaldehyde resin prepolymer: Add urea, formaldehyde and deionized water into a three-necked flask equipped with a thermometer and a stirring device, the molar ratio of urea to formaldehyde is 1:2.0, adjust the pH to 8.5 with triethanolamine, and raise the temperature to 70 ℃, stirring at low speed for 1 hour to obtain a clear and transparent aqueous solution of urea-formaldehyde resin prepolymer;
[0031] Preparation of microcapsule suspension: Dissolve 30 g of pendimethalin in 15 g of xylene at room temperature, add 13 g of the above-mentioned urea-formaldehyde resin prepolymer aqueous solution and 0.7 g of polyvinyl alcohol while stirring, and use 1500 rev / min high-speed Stir and react for 1 hour. After the oil-in-water emulsion is formed, reduce the speed to 800 rpm. Add hydrochloric acid solution in 5 batches within 60 minutes to adjust the pH value of the system to 2.0. After 1 hou...
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