Preparation method and application of efficient antibacterial bactericide for melons, fruits and vegetables
A fungicide and vegetable technology, applied in the field of preparation and application of agricultural and sideline products, can solve the problems of delayed effect, high price, and less application of natural antibacterial agents, and achieve the effects of strong inhibition, low production cost, and low residual rate
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[0019] Example 1:
[0020] Add 10 grams of polyvinylamine to the reactor at room temperature, then add 1000 ml of water, mix well, add 10 grams of difluorobenzoic acid and continue stirring. After 50 minutes, heat up to 40°C, add 0.1M dilute hydrochloric acid to adjust the pH of the solution to 6.0 and slowly add 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride under nitrogen protection 10g, after stirring for 3 hours, cool down and discharge. The reaction solution was separated and purified through a dialysis membrane for 3 days. After drying, 0.2 g of lanthanum trichloride was added to the product and stirred uniformly to obtain the final product 1.
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[0021] Example 2:
[0022] Add 10 grams of polyvinylamine to the reaction kettle at room temperature, then add 1000 ml of water and 100 ml of ethanol, mix well, add 5 grams of difluorobenzoic acid and continue stirring. After 90 minutes, the temperature was raised to 65°C, acetic acid was added to adjust the pH of the solution to 4.0, and 18 grams of 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride was slowly added under the protection of nitrogen. After stirring for 4 hours, the temperature was lowered and the material was discharged. The reaction solution is separated and purified through a dialysis membrane for 2 days. After drying, 0.4 g of neodymium chloride is added to the product and stirred evenly to obtain the final product 2.
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[0023] Example 3:
[0024] Add 10 g of polyvinylamine to the reaction kettle at room temperature, then add 800 ml of water and 25 ml of methanol, mix well, add 4 g of difluorobenzoic acid and continue stirring. After 60 minutes, the temperature was raised to 35° C., 0.1M oxalic acid was added to adjust the pH value of the solution to 5.0, and 5 g of diisopropylcarbodiimide was slowly added under the protection of nitrogen. After stirring for 2 hours, the temperature was cooled and the material was discharged. The reaction solution was separated and purified through a dialysis membrane for 4 days. After drying, 0.6 g of cerium tetrachloride was added to the product and stirred uniformly to obtain the final product 3.
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