A preparation method of foliage-affinity pesticide nano-microcapsules based on tannic acid modification

A technology of nano-microcapsules and tannic acid is applied in the fields of botanical equipment and methods, biocides, animal husbandry, etc., to achieve the effects of low equipment investment cost, high foliar adhesion, and stable and reliable product quality.

Active Publication Date: 2021-11-23
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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  • A preparation method of foliage-affinity pesticide nano-microcapsules based on tannic acid modification
  • A preparation method of foliage-affinity pesticide nano-microcapsules based on tannic acid modification
  • A preparation method of foliage-affinity pesticide nano-microcapsules based on tannic acid modification

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 method for preparing leaf surface-affinity pesticide nano-microcapsules based on tannic acid modification, and belongs to the field of pesticide preparation. The foliage-affinity pesticide nano-microcapsules of the present invention use modified starch as the nano-microspheres formed as the pesticide carrier as the capsule core, and use the chelate of tannic acid and ferric chloride as the capsule wall. Nitric acid has adhesive properties on the surface of various materials, which is beneficial to reduce the rolling off of pesticide molecules. In addition, the small size and large specific surface area of ​​nanomaterials can also increase the retention of liquid medicine on the leaves of crops, increase the contact area with harmful organisms, and improve the effective utilization of pesticides. Compared with the in-situ polymerization method and interfacial polymerization method which are widely used at present, the raw material of the present invention has good biocompatibility, is safe for producers, has simple preparation process, low production cost and equipment investment cost, and does not produce pollutants. The quality is stable and reliable, can effectively improve the foliar retention rate of pesticides, and has very broad application prospects.

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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Patent Type & Authority Patents(China)
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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