Emamectin benzoate microcapsule suspending agent and preparation method thereof

Abstract

The invention relates to the technical filed of pesticide preparation production processing. An emamectin benzoate microcapsule suspending agent contains the following components by weight percent: 1-10% of emamectin, 1-20% of organic solvent, 5-20% of melamino-formaldehyde resin, 1-10% of surfactant, 0.01-2% of pH regulator and 0.01-3% of dispersant, the balance of water, and viscosity regulator can be added. The preparation method includes that firstly melamine-formaldehyde prepolymer is prepared, emamectin is dissolved by organic solvent, aqueous solution containing surfactant is added, and rapid stirring is carried out, then the prepared prepolymer is added and stirring is carried out; and then pH value of material is regulated to be 3-4, so as to promote membrane forming reaction, solidification and temperature reduction are carried out, pH value is regulated to be neutral, dispersant and viscosity regulator are added, and water is used for causing the weight percent to be 100%. The invention can improve stability and persistence of preparation and reduce toxicity to environment and people and livestock.

Description

technical field [0001] The invention belongs to the technical field of pesticide preparation production. Background technique [0002] Microcapsule suspension pesticide refers to a pesticide dosage form that uses natural or synthetic polymer materials to form a core-shell structure micro container, encapsulates the pesticide, and suspends in water. It includes two parts: the capsule wall and the capsule core. The capsule core is the active ingredient and solvent of the pesticide, and the capsule wall is the film-forming polymer material. This dosage form is divided into a continuous phase and a discontinuous phase, the continuous phase is water and additives, and the discontinuous phase is coated pesticide microcapsules. [0003] The technical difficulties of the microcapsule suspension preparation process are: (1) the control of temperature, pH value and stirring speed when the microcapsules are film-forming: the temperature is too high, the final product has irregular app...

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Problems solved by technology

(3) Quality ratio control of wall material and core material: if the ratio of wall material and core material is too large, the wall film of microcapsules will be too thick, and the average particle size will be too small, resulting in poor slow release performance of the product; If the proportion of the core material is too small, the embedding rate of the core material will decrease

[0006] Emamectin benzoate can be processed into many dosage forms, but most of the dosage forms have a short control period, which increases the number of spraying and investment of farmers. Therefore, processing it into microcapsule suspensions can solve the above problems, especially to play this role. The slow-release function of the dosage form improves the utilization rate, prolongs the duration of effect and reduces the number of times of use. At the same time, it protects the active ingredients from direct sunlight and solves the problem that emamectin benzoate is easy to decompose when exposed to strong sunlight.