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Preparation method of tannic acid modification-based leaf surface affiliative pesticide nano microcapsules

A technology of nano-microcapsules and tannic acid is applied in the directions of botanical equipment and methods, biocides, plant growth regulators, etc., to achieve the effects of improving deposition efficiency, stable and reliable product quality, and broad application prospects.

Active Publication Date: 2019-12-31
INST OF ENVIRONMENT & SUSTAINABLE DEV IN AGRI CHINESE ACADEMY OF AGRI SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there are no relevant literature and patent reports on the use of tannic acid to modify the pesticide nano-loading system to improve the efficiency of leaf deposition

Method used

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  • Preparation method of tannic acid modification-based leaf surface affiliative pesticide nano microcapsules
  • Preparation method of tannic acid modification-based leaf surface affiliative pesticide nano microcapsules
  • Preparation method of tannic acid modification-based leaf surface affiliative pesticide nano microcapsules

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Embodiment 1: the preparation of modified starch acetate

[0032] Weigh 60g of cornstarch and disperse evenly in 80mL of glacial acetic acid, then add 100mL of cooled acetic anhydride to it, after 15 minutes, add 1.0g of p-toluenesulfonic acid into the reaction solution, and stir the reaction mixture at 80°C for 3 hours , and poured into deionized water. The mixture was washed continuously with deionized water, and finally the solid was dried overnight in a vacuum oven at 50° C. to obtain a white powder, which was modified starch acetate.

Embodiment 2

[0033] Example 2: Preparation of Foliar Affinity Pesticide Nanocapsules

[0034] Specific steps are as follows:

[0035] Polyvinyl alcohol is dissolved in water to obtain an aqueous phase solution with a concentration of 0.5% by weight;

[0036] Abamectin and the modified starch acetate prepared in Example 1 are dissolved in methylene chloride, wherein the weight ratio of starch acetate and Abamectin is 1:1, to obtain an organic phase solution;

[0037] According to the volume ratio of the organic phase solution to the aqueous phase solution of 1:3, add the above organic phase solution into the above aqueous phase solution, stir and mix evenly to obtain the primary emulsion;

[0038] Use 300W to further ultrasonically emulsify the primary emulsion for 3 minutes; then stir at 500 rpm at room temperature until the organic solvent is completely volatilized to obtain pesticide nanospheres;

[0039] The ferric chloride aqueous solution with a concentration of 1.0% by weight is ad...

Embodiment 3

[0040] Example 3: Preparation of Foliar Affinity Pesticide Nanocapsules

[0041] Specific steps are as follows:

[0042] Polyvinyl alcohol is dissolved in water to obtain an aqueous phase solution with a concentration of 2.0% by weight;

[0043] The modified starch acetate prepared in emamectin benzoate and embodiment 1 is dissolved in methylene chloride, wherein the weight ratio of starch acetate and emamectin benzoate is 1 : 5, obtain organic phase solution;

[0044] According to the volume ratio of the organic phase solution to the aqueous phase solution of 1:10, add the above organic phase solution into the above aqueous phase solution, stir and mix evenly to obtain the primary emulsion;

[0045] Use 300W to further ultrasonically emulsify the primary emulsion for 5 minutes; then stir at 1000rpm at room temperature until the organic solvent is completely volatilized to obtain pesticide nanocapsules;

[0046] The ferric chloride aqueous solution with a concentration of 0...

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Abstract

The invention discloses a preparation method of tannic acid modification-based leaf surface affiliative pesticide nano microcapsules, and belongs to the field of pesticide preparation. According to the preparation method, nano microspheres formed by taking modified starch as a pesticide carrier are taken as capsule cores, and a chelate of tannic acid and ferric trichloride is taken as capsule walls; the advantages are that: tannic acid possesses adhesion characteristic on the surfaces of various materials, and rolling off off-target of pesticide molecules is reduced; and in addition, because of the small size and the large specific surface area of the nano material, the retention amount of pesticide liquid on crop leaf surfaces can be increased, the contact area with harmful organisms is increased, and the effective utilization rate of pesticide is increased. Compared with an in-situ polymerization method and an interfacial polymerization method which are more used at present, the rawmaterials disclosed in the invention are good in biocompatibility and safe to producers, the preparation process is simple, the production cost and the equipment investment cost are low, no pollutantis generated, the product quality is stable and reliable, the leaf surface retention rate of the pesticide can be effectively increased, and very wide application prospects are achieved.

Description

【Technical field】 [0001] The invention belongs to the field of pesticide preparation, and in particular relates to a method for preparing leaf-surface-affinity pesticide nano-microcapsules based on tannic acid modification. 【Background technique】 [0002] Pesticides are an important material basis for defending against major biological disasters, ensuring national food production, and promoting sustained and stable growth in agricultural product output. However, the effective utilization rate of traditional pesticide dosage forms is extremely low. During the field application process, most of the pesticide liquid goes off-target and enters the surrounding environment, which makes the excessive application of pesticides serious, causing a series of environmental pollution and agricultural product quality and safety issues. [0003] The surface of crop leaves has a variety of hydrophobic micro-nano structures (such as waxy layers, villi, papillae, etc.), which make it difficul...

Claims

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Application Information

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IPC IPC(8): A01N25/28A01N43/90A01N43/54A01N43/56A01N53/08A01P7/04C08B31/04
CPCA01N25/28A01N43/54A01N43/56A01N43/90A01N53/00C08B31/04
Inventor 曾章华余曼丽孙长娇崔海信
Owner INST OF ENVIRONMENT & SUSTAINABLE DEV IN AGRI CHINESE ACADEMY OF AGRI SCI
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