Emamectin benzoate hexaflumuron water dispersible granules as well as preparation method and preparation device thereof

Abstract

The invention discloses emamectin benzoate hexaflumuron water dispersible granules as well as a preparation method and a preparation device thereof. The emamectin benzoate hexaflumuron water dispersible granules are prepared by the following steps: placing an acetic acid aqueous solution with the mass fraction of 20-55% in a container, adding aniline and a phase transfer catalyst into the acetic acid aqueous solution, adding a sodium cyanate aqueous solution with the mass fraction of 10-35% under a stirring condition, and adding water for dilution, and filtering the diluted solution through a filter cake, drying to obtain phenylurea, adding the prepared phenylurea into an organic solvent, adding acyl chloride and a reaction catalyst, carrying out reduced pressure distillation on the solution after the reaction is ended to recover the solvent, adding a sodium bicarbonate solution with the mass fraction of 5%, stirring, filtering, and recrystallizing with 80-90% ethanol to obtain hexaflumuron; and compounding the emamectin benzoate and the hexaflumuron to prepare the emamectin benzoate and hexaflumuron water dispersible granules, so that the prepared emamectin benzoate and hexaflumuron water dispersible granules are few in side reaction, high in safety and convenient to store.

Description

technical field [0001] The invention relates to the field of pesticide preparation, in particular to a water-dispersible granule of emamectin-hexaflumuron and its preparation method and preparation device. Background technique [0002] At present, emamectin-hexaflumuron water-dispersible granules have high insecticidal and ovicidal activities, and are quick-acting, especially for the control of cotton bollworm. Used in cotton, potato and fruit trees to control various Diptera and Homoptera insects. [0003] At present, hexaflumuron is produced by oxalyl chloride and difluorobenzamide, or oxalyl chloride is produced by oxalyl chloride and aniline. Since oxalyl chloride is a colorless fuming liquid, it reacts violently with water or alcohol and decomposes hydrogen chloride. Strong toxicity and corrosiveness, in the process of operation, this kind of substance is not stable enough, it is easy to self-aggregate, so it is difficult to store. Contents of the invention [0004]...

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Problems solved by technology

[0004] The object of the present invention is to provide a kind of emamectin-hexaflumuron water-dispersible granules and its preparation method and preparation device, aiming to solve the problem in the prior art of preparing hexaflumuron through oxalyl chloride and difluorobenzamide, or Oxalyl chloride is prepared from oxalyl chloride and aniline. Since oxalyl chloride is a colorless fuming liquid, it reacts violently with water or alcohol and decomposes hydrogen chloride, which is highly toxic and corrosive. During the operation, this kind of substance is not stable enough. , easy to self-aggregate, thus difficult to store technical problems

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