Microcapsule suspension containing pendimethalin and clomazone and preparation method thereof
A microcapsule suspending agent, clomazone technology, which is applied in the fields of botanical equipment and methods, herbicides, algicides, biocides, etc. and other problems, to achieve the effect of simple process, easy control and low price
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Embodiment 1
[0028] Embodiment 1: 5.5% pendimethalin clomazone microcapsule suspension
[0029] 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;
[0030] Preparation of microcapsule suspension: Dissolve 5 g of pendimethalin and 0.5 g of clomazone in 4.0 g of xylene at room temperature, add 5 g of the above-mentioned urea-formaldehyde resin prepolymer aqueous solution and 0.5 g of polyvinyl alcohol while stirring , stirring and reacting at a high speed of 1500 rpm 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 va...
Embodiment 2
[0031] Embodiment 2: 11% pendimethalin clomazone microcapsule suspension
[0032] 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;
[0033] Preparation of microcapsule suspensions: Dissolve 10 g of pendimethalin and 1 g of clomazone 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 spin at 1500 rpm / min high-speed stirring reaction for 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 s...
Embodiment 3
[0034] Embodiment 3: 18% pendimethalin clomazone microcapsule suspension
[0035] 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;
[0036] Preparation of microcapsule suspension: 16g of pendimethalin and 2g of clomazone were dissolved in 10g of xylene at normal temperature, and 13g of the above-mentioned urea-formaldehyde resin prepolymer aqueous solution and 0.5g of polyvinyl alcohol were added while stirring. 1500 rpm high-speed stirring reaction 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 val...
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