The application discloses a preparation method of
mancozeb, and belongs to the technical field of pesticides. In the application, 1 mole equivalent of
mannan, 1-1.1 mole equivalent of
zinc sulfate heptahydrate are added into a
hot melt extruder, the screw rotation speed is 50-250 r / min, the temperature of a
mixing zone is controlled to be 30-40 DEG C, the temperature of a melting zone is controlled to be 100-110 DEG C, the temperature of a homogenizing zone is controlled to be 110-120 DEG C, and
mancozeb is obtained after cooling. The
mixing zone, the melting zone and the homogenizing zone of the
hot melt extruder can independently set the temperature, and sequentially execute the processes of mixing, melting and homogenizing, and the temperature values are set according to the
process requirements. The extrudate is cooled and pressure-filtered to obtain
mancozeb, and the product can be dried and stored in the dark. The preparation method is environment-friendly, simple and low in preparation cost, does not pass through physical
grinding and other processes, has little change on the current mancozeb preparation process, and has no additional three-waste output.