A kind of pendimethalin microcapsule and its efficient preparation method

Abstract

The invention discloses a pendimethalin microcapsule. The microcapsule comprises pendimethalin, capsule wall materials, an emulsifier, a dispersing agent, a defoaming agent, an antifreezing agent, a preservative, a thickening agent and the balance water or filler. The pendimethalin microcapsule has the advantages that the toxicity, pesticide damage and environmental pollution of pesticide can be lowered, the persistence and efficacy time is long, the toxicity to the environment and the human body is low, the stability of effective components is good, and the microcapsule is not easily washed by rainwater. The invention further discloses a preparation method of the pendimethalin microcapsule. An adopted microreactor has the advantages that the microreactor is small in size, easy to clean and good in leakproofness, the reaction is evenly and quickly conducted, and control is conducted precisely. By preparing the pendimethalin microcapsule in the microreactor, the curing time can be greatly shortened, and the working efficiency is greatly improved.

Description

technical field [0001] The invention relates to the technical field of pesticide microcapsules, in particular to a pendimethalin microcapsule and a high-efficiency preparation method thereof. Background technique [0002] Pendimethalin is a dry field herbicide developed by American Cyamide Company (now BASF) in 1972. Its main target is used for weeding in soybean fields. Its advantage is that it is not only effective for monocotyledonous weeds, but also effective for dicotyledonous weeds It is effective and has a long application period, and can be used from pre-sowing to post-emergence. And it can be applied to a variety of crops, such as corn, cotton, wheat and other crops with good results. Pendimethalin has been widely promoted in my country because of its advantages in use, but there are still some problems. First of all, its main dosage form is emulsifiable concentrate, which contains a large amount of organic solvents, which is easy to cause pollution to the environ...

AI Technical Summary

Problems solved by technology

The commonly used preparation methods of pendimethalin microcapsules in industrial production are interfacial polymerization and in-situ polymerization, and the equipment used is usually a batch reactor, so there are some problems in the preparation process

In the technical solution disclosed in patent 201610320446.1, the shear rate of the microcapsule preparation process is high, and it is difficult to realize industrialization; and the capsule wall material is added to the water phase, and various side reactions are prone to occur at a temperature of 60-70°C

In the technical solution disclosed in patent 201710440274.6, oily wall materials and water-based wall materials are used to improve the stability of pendimethalin microcapsule suspensions, but the reaction process is more complicated, and the reaction time also needs 1-3h, so it is difficult to avoid side reactions or reactions. Inequalities, and when preparing high content such as 50% content, the proportion of active ingredients, wall materials, dispersants and other necessary components is relatively large, the adjustment range of other ingredients in the formula is small, and it is difficult to scale up production