Zineb synthesizing process

Abstract

The new zineb synthesizing process features that ambam is first synthesized with ethylenediamine, carbon disulfide and ammonia water, and then reacted with zinc chloride to synthesize zineb. The present invention has the useful effects of simple preparation process, zineb product reaching ideal state in zinc content, false specific weight, water content, stability, etc., easy crushing of zineb product in producing into wettable powder, and suspension rate over 80 %.

Description

Technical field: [0001] The invention relates to pesticide technology, and is a method for synthesizing plant fungicides, specifically, a new process for synthesizing zineb. Background technique: [0002] Zinc is a high-efficiency, low-toxicity, broad-spectrum, protective organosulfur fungicide, used to prevent and control many diseases of various crops, such as wheat rust, head blight, rice blast, white leaf disease, apple And red spot disease, black spot disease, flower rot of pear, grape downy mildew, black pox, anthracnose of peach tree, downy mildew of cucumber, tobacco blight, beet brown spot, etc. It was successfully developed by Rhom anclHass co. in 1943, and it was put into production and began to be applied in my country in 1965. [0003] Traditional production methods: [0004] 1. Synthesis of Sodium Dyson [0005] <chemistry num="001"> <chem file="200410103252_cml001.xml" / > < / chemistry> [0006] 2. Synthesis of Zinc [0007] <chemis...

AI Technical Summary

Problems solved by technology

[0008] On the surface, the Zinc produced by this method has relatively high content, yellowish color, and other indicators are normal, but further analysis will find that the zinc content in Zinc may be higher than the theoretical zinc content in the molecular structure. Low, that is to say, Sodium Zinc and Zinc Chloride did not fully react to form Zinc Zinc, and the analysis of Zinc Zinc is a chemical analysis method, which releases carbon disulfide through acid solution, and calculates Zinc Zinc according to the two of carbon disulfide That is to say, as long as the substance in the sample can be acidified to release carbon disulfide, even if the content of the active ingredient is falsely high, the stability of such Zinc Zinc is poor when stored, and domestic manufacturers produce 85% of the original drug for export In foreign countries, after a period of time, the decomposition leads to a sharp drop in the content, which often causes foreign companies to claim. Moreover, after the original drug is processed into a wettable powder, it is difficult to achieve the ideal target in terms of suspension rate and fineness. Generally, the suspension rate after processing is only There are 30-40%, so the national standard stipulates that the suspension rate of Zinc wettable powder is only 60%, and the FAO is only 70%. It is difficult for domestic Zinc to meet the national and international standards.

Many manufacturers use airflow crushing to crush the original drug, which consumes a lot of energy, or uses imported additives to increase its suspension rate, which greatly increases the processing cost, and its internal quality cannot be changed by physical methods, and the drug effect remains the same.

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