Method for preparing adhesive abamectin polydopamine microcapsule by employing emulsion interface polymerization method

Abstract

The invention relates to a method for preparing an adhesive abamectin polydopamine microcapsule by employing an emulsion interface polymerization method, and aims at solving the problems that abamectin is easy to decompose in light, and most of dosage forms cannot effectively remain on a plant leaf surface. The method comprises the following steps: with a Tris-HCl buffer liquid containing cetyltrimethylammonium chloride (1.5%m / v of water phase) as a water solution, and an n-butyl alcohol solution containing abamectin as an oil phase, carrying out oxidizing auto-polymerization on an emulsion interface through polydopamine (the density is 1mg / mL); carrying out mechanical agitation at room temperature for 24 hours; and centrifugally washing to obtain the abamectin polydopamine microcapsule with stickiness and light stability, wherein the microcapsule has temperature and pH control-release property. The abamectin polydopamine microcapsule which is uniform in size, high in loading capacity and high in stickiness can be prepared by the method disclosed by the invention; and the method is high in yield and simple in steps, and can be applied to industrialization.

Description

technical field [0001] The present invention relates to a method of firstly emulsifying abamectin, and then performing oxidative self-polymerization on the interface of the emulsion through dopamine and its derivatives to obtain microcapsules with adhesion, temperature-controlled release, pH-controlled release and light stability. method. Background technique [0002] China is a large agricultural country, and harmful organisms occur frequently, frequently and repeatedly. The use of chemical pesticides to control diseases, insects, and weeds is currently the most important and effective means of prevention and control. However, only 20% to 30% of the sprayed pesticides remain and deposit on the target, and the other 70% to 80% are lost or lost into the soil, causing pollution to the living environment of animals and humans. There are two main reasons for the waste and loss of pesticides: First, the pesticides applied to crops cannot be given according to the growth needs o...

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Problems solved by technology

[0004] Aiming at the problems that abamectin is easy to decompose when exposed to light, and the commonly used emulsifiable oil formulations use a large amount of organic matter and have different residence times on the leaves of different plants, resulting in low utilization rate, large amount of use and environmental pollution. From the perspective of bionics, combined with control Release technology, based on dopamine chemistry, prepared biomimetic adhesive avermectin polydopamine microcapsules by emulsion polymerization; the release kinetics studies showed that the microcapsules had controlled release and photostability; the biomimetic was verified by scanning electron microscopy Adhesive properties of polydopamine microcapsules in aqueous suspension on cotton and corn leaves

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