A kind of anti-hardening cotton wool preparation method

Abstract

The invention relates to a method for preparing anti-hardening cotton wool, which belongs to the technical field of pesticide synthesis. In order to solve the existing problem of short storage time and easy agglomeration, a method for preparing cotton wool that is resistant to hardening is provided. The method includes adding a permanganate aqueous solution to the carbon disulfide solution for pretreatment, layering, and collecting the pretreated Carbon disulfide solution; react the pretreated carbon disulfide solution with concentrated methylamine aqueous solution to obtain an aqueous solution containing N-methyldithiocarbamic acid; in the presence of phosphate, amphoteric surfactant and EDTA, react with formaldehyde to obtain The amount of phosphate added is 1.0%-1.5% of the mass of formaldehyde, and the mass ratio of phosphate: amphoteric surfactant: EDTA is 1:0.5-0.6:0.01-0.02. The invention can increase the uniformity and distribution concentration of the particles and increase the compaction resistance of the cotton wool particles, so as to have the effect of high fluidity.

Description

technical field

[0001] The invention relates to a method for preparing anti-hardening cotton wool, which belongs to the technical field of pesticide synthesis. Background technique

[0002] Methron is a low-toxicity broad-spectrum fumigation nematicide, which can also control soil fungi, underground pests and weeds. When applied in a moist soil environment, it can decompose and spread to the soil particles, effectively killing various nematodes, pathogenic bacteria and weed seeds in the soil, so as to achieve a cleaning effect and have a long-lasting medicinal effect. It is also suitable for controlling various nematodes on vegetables, strawberries, etc. Usually, cotton wool is processed into dosage forms such as powder and wettable powder.

[0003] At present, the domestic and foreign production methods for damaron mainly use carbon disulfide, monomethylamine and formaldehyde as the main raw materials, which are formed through a two-step reaction, specifically: first, rea...