Method for manufacturing 2-chlorine-6-nitrapyrin microcapsule suspending agents

Abstract

The invention discloses a method for manufacturing 2-chlorine-6-nitrapyrin microcapsule suspending agents. The method includes dissolving a certain quantity of 2-chlorine-6-nitrapyrin in a certain quantity of toluene to obtain solution, adding a small quantity of NP (nonyl phenol)-10 emulsifying agents into the solution, uniformly stirring the solution and then adding a certain quantity of urea resin solution into the solution to obtain mixed solution; shearing the mixed solution at a high rotational speed for 40 minutes, reducing the rotational speed after materials in the mixed solution are sufficiently dispersed, and slowly adding hydrochloric acid with the concentration of 37% into the mixed solution so that a pH (potential of hydrogen) value of the mixed solution is regulated and ranges from 2.5 to 3; enabling the mixed solution to perform acidification reaction for 1 hour to form microcapsule particles; reducing the rotational speed to 200r / min within 20 minutes, controlling the temperature to range from 40 DEG C to 50 DEG C, and solidifying the microcapsule particles for 1 hour; and regulating the pH value of the microcapsule particles by 7.5-15% of sodium hydroxide aqueous solution so that the pH value ranges from 5 to 7, and adding 10-25% of NP-10 emulsifying agents into the microcapsule particles to form the microcapsule suspending agents. The method has the advantages that the products manufactured by the method are good in stability and low in environmental pollution, and contain few organic solvents, the cost is saved, and injury to operators is prevented.

Description

[0001] technical field

[0002] The invention relates to the technical field of pesticide preparation processing, in particular to a preparation method of 15%-30% 2-chloro-6-trichloromethylpyridine microcapsule suspension. Background technique

[0003] Microcapsule suspension refers to a pesticide dosage form that uses natural or synthetic polymer materials to form a "core-shell" structure micro-container, encapsulates pesticides in it, and suspends in water. 2-Chloro-6-trichloromethylpyridine can be used as a nitrogen oxidation inhibitor and soil nitrogen fertilizer protectant due to its selective activity on nitrogen-fixing bacteria. When applied together with urea and nitrogen fertilizer, it can delay the oxidation of ammonium ions in the soil, However, its efficacy is relatively short, and 2-chloro-6-trichloromethylpyridine needs to be applied multiple times. The number of times of application is large and the amount of application is relatively large, thereby causin...