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Polydopamine pesticide microcapsule and preparation method thereof

A technology of polydopamine and microcapsules, applied in botany equipment and methods, insecticides, animal repellents, etc., can solve the problems of affecting the stability of drug efficacy, restricting development and application, and failing to achieve residues, etc., to achieve reduction Pesticides pollute the environment, improve adhesion performance, and improve the effect of residues

Active Publication Date: 2019-02-01
ZHONGKAI UNIV OF AGRI & ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, although fipronil has a good control effect on pests, because it is easy to oxidize and decompose when exposed to light, it will quickly decompose and lose its efficacy under ultraviolet radiation, and its half-life is also short, and its solubility in water is also low. Very small, which affects the stability of its efficacy
In addition, the adhesion of phenylpyrazole pesticides including fipronil is very poor, no matter whether it is applied to the soil or sprayed on the leaves, it cannot achieve a good residue, and it is easy to be washed away by rain, causing environmental damage. Pollution
Because phenylpyrazole pesticides are toxic to aquatic organisms such as bees, fish and shrimp, their large loss rate causes serious damage to the biological chain, thus limiting their development and application

Method used

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  • Polydopamine pesticide microcapsule and preparation method thereof
  • Polydopamine pesticide microcapsule and preparation method thereof
  • Polydopamine pesticide microcapsule and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0059] The present embodiment 1 provides a kind of preparation method of alkaline buffer solution, and it comprises the steps: use deionized water to prepare respectively the trishydroxyaminomethane solution that concentration is 0.01mol / L and the hydrochloric acid solution that concentration is 0.1mol / L, and then The hydrochloric acid solution is slowly added dropwise into the trishydroxyaminomethane solution to obtain the basic buffer solution.

Embodiment 2

[0061] This embodiment 2 provides a preparation method of polydopamine pesticide microcapsules coated with a single layer, which includes the following steps: accurately weigh 0.8g phenylpyrazole pesticides and 0.5g dopamine hydrochloride with a precision analytical balance, and weigh the A good phenylpyrazole pesticide was carefully put into a 250mL round-bottomed flask, and 200mL of the alkaline buffer solution in Example 1 was measured and slowly poured into the round-bottomed flask, and ultrasonically oscillated for 5 minutes to make the phenylpyrazoles Pesticides were evenly dispersed in the alkaline buffer solution, and finally added dopamine hydrochloride weighed into the round bottom flask, stirred with an electric mixer at room temperature for 24 hours, and the stirring speed was 550r / min; after the reaction was completed, centrifuged with a centrifuge, Keep the turbid part of the lower layer, add deionization for the next washing and centrifugation, then use a 0.22 μm...

Embodiment 3

[0063] This embodiment 3 provides a preparation method of a double-layer coated polydopamine pesticide microcapsule, which includes the following steps: accurately weigh 0.8 g of the single-layer coated polydopamine pesticide microcapsule prepared in Example 2 with a precision analytical balance. Capsules and 0.5g dopamine hydrochloride, put the polydopamine pesticide microcapsules weighed into a 250mL round-bottomed flask, measure the alkaline buffer solution of 200mL embodiment 1 and slowly pour it into the round-bottomed flask, ultrasonically vibrate for 5min, To make the polydopamine pesticide microcapsules evenly dispersed in the alkaline buffer solution, finally add the weighed dopamine hydrochloride in the round-bottomed flask, stir with an electric mixer at room temperature for 24 hours, and the stirring speed is 550r / min; after the reaction is completed, Centrifuge with a centrifuge, keep the turbid part of the lower layer, add deionization for the next washing and cen...

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Abstract

The invention discloses a polydopamine pesticide microcapsule and a preparation method thereof. The polydopamine pesticide microcapsule comprises a capsule core and a coating layer covering the capsule core, the capsule core is a phenylpyrazole pesticide, and the coating layer is polydopamine. The method uses polydopamine as the coating layer to microencapsulate the phenylpyrazole pesticide, and polydopamine has good reflection and absorption properties to ultraviolet rays, and also has excellent hydrophilicity and adhesion performance, thus, the photodegradation rate and the ultraviolet decomposition rate of the phenylpyrazole pesticide can be effectively alleviated, the hydrophilicity of the phenylpyrazole pesticide can be improved, the dispersion property in water can be improved, and the adhesive properties of the phenylpyrazole pesticides can be greatly improved, when applied to soil and foliage, the pesticide can achieve better residue, reduces the loss rate, and has better effect in maintaining efficacy and reducing pollution.

Description

technical field [0001] The invention relates to the technical field of pesticide sustained release, in particular to a polydopamine pesticide microcapsule and a preparation method thereof. Background technique [0002] As a special commodity for controlling agricultural and forestry crop diseases, insects, weeds, rats and other harmful biological hazards, pesticides play an extremely important role in protecting agricultural production, improving comprehensive agricultural production capacity, promoting stable grain production and farmers' income. Indispensable means of production and disaster relief materials for modern agriculture. As a country with a large population in the world, my country needs to use 7% of the world's arable land and 6% of the fresh water resources to support 22% of the world's population. The importance of pesticides in the national economy is even more obvious. According to statistics, my country uses more than 280,000 tons of pesticides on average...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A01N47/02A01N43/56A01N25/28A01P7/04
CPCA01N25/28A01N43/56A01N47/02
Inventor 周新华高凡周红军沈之川
Owner ZHONGKAI UNIV OF AGRI & ENG
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