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A kind of sustained-release nanopesticide and preparation method thereof

A slow-release and insecticide technology, which is applied in the field of slow-release nano-insecticide and its preparation, can solve the problems of large particle size, short storage period and short drug effect period of water dispersible material, and achieve good control effect. , good stability

Inactive Publication Date: 2021-06-18
INST OF PLANT PROTECTION SICHUAN ACAD OF AGRI SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, azadirachtin is easily oxidized, photolyzed and water-insoluble, and general azadirachtin emulsifiable concentrates and suspension preparations have coarse particle size, small specific surface area and slow drug effect, so it is difficult to effectively exert the special effect of the drug; The processing of azadirachtin is easily polluted by Aspergillus flavus, etc., resulting in a short storage period; when general azadirachtin EC and suspension preparations are used, the active ingredients of azadirachtin are decomposed due to the influence of natural factors such as light Faster, short drug effect period, generally 6-10 days, 2-4 times of pesticide application per season, which increases agricultural production costs and labor expenditure

Method used

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  • A kind of sustained-release nanopesticide and preparation method thereof
  • A kind of sustained-release nanopesticide and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Embodiment 1 0.3% sustained-release nanometer (azadirachtin / chitosan) insecticide

[0029] 1. Ratio preparation

[0030] Active ingredient adopts azadirachtin (core material) and nano-chitosan (shell material), and auxiliary agent is dehydrated alcohol, fatty alcohol polyoxyethylene ether type nonionic surfactant (JFC); Calculated as 0.3 parts of azadirachtin, 0.47 parts of nano-chitosan, 0.155 parts of fatty alcohol polyoxyethylene ether nonionic surfactant (JFC), 5.25 parts of absolute ethanol, and 100 parts of deionized water.

[0031] 2. Preparation of pesticides

[0032] 2.1 Preparation of azadirachtin

[0033] Azadirachtin and organic solvent are prepared in a ratio of 1.0:15 by weight, and a transparent solution is made at room temperature and under strong dispersion conditions; then a surfactant active agent is added to the transparent solution and stirred for 30 minutes to prepare azadirachtin vegetarian composition.

[0034] 2.2 Preparation of pesticides ...

Embodiment 21

[0036] Embodiment 2 1.0% sustained-release nanometer (azadirachtin / chitosan) insecticide

[0037] 1. Ratio preparation

[0038] Active ingredients are azadirachtin (core material) and nano-chitosan (shell material), and auxiliary agents are dehydrated alcohol, BJ-801 type polyoxyethylene nonionic surfactant, and each raw material is calculated as India by weight. Add 1.0 parts of nimbin, 0.47 parts of nano-chitosan, 0.155 parts of BJ-801 polyoxyethylene nonionic surfactant, 6.2 parts of absolute ethanol, and deionized water to 100 parts.

[0039] The preparation method is the same as that of Example 1 except that the azadirachtin and the organic solvent are proportioned in parts by weight of 1.0:20.6.

Embodiment 3

[0040] Embodiment 3 0.5% sustained-release nanometer (azadirachtin / chitosan) insecticide

[0041] 1. Ratio preparation

[0042] The effective ingredients are azadirachtin (core material) and nano-chitosan (shell material), and the additives are absolute ethanol, castor oil polyoxyethylene nonionic surface agent (EL-40), and deionized water added to 100 parts , each bulk drug is 0.5 part by weight of azadirachtin, 0.3 part of nano-chitosan, 0.155 part of castor oil polyoxyethylene nonionic surface agent (EL-40), 5.0 part of absolute ethanol, deionized water plus up to 100 servings.

[0043] The preparation method is the same as that of Example 1 except that the azadirachtin and the organic solvent are proportioned in parts by weight of 1.0:10.4.

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Abstract

The invention discloses a slow-release nano-pesticide and a preparation method thereof, relating to the field of biological pesticides, which is a slow-release preparation of nano-scale (azadirachtin / chitosan) synthesized from nano-chitosan and azadirachtin, It has a three-dimensional network conformation and slow-release characteristics; the preparation is completely soluble in water and has good stability, and its indoor toxic activity against crop aphid pests such as tobacco aphid, cabbage aphid, wheat aphid and orange aphid has increased by 54.47% to 98.41%, The indoor virulence activity of Lepidoptera pests such as tobacco budworm, cabbage caterpillar, diamondback moth and Spodoptera litura has increased by 31.75% to 65.35%, and the insecticide provided by the invention is used for field control. Crop aphid pests such as wheat aphid and orange aphid, and Lepidoptera pests such as tobacco budworm, cabbage caterpillar, diamondback moth and Spodoptera litura have good insecticidal effects.

Description

technical field [0001] The invention relates to the field of biopesticides, in particular to a sustained-release nanometer (azadirachtin / chitosan) insecticide and a preparation method thereof. Background technique [0002] Azadirachtin is an internationally recognized broad-spectrum natural insecticide. However, azadirachtin is easily oxidized, photolyzed and water-insoluble, and general azadirachtin emulsifiable concentrates and suspension preparations have coarse particle size, small specific surface area and slow drug effect, so it is difficult to effectively exert the special effect of the drug; The processing of azadirachtin is easily polluted by Aspergillus flavus, etc., resulting in a short storage period; when general azadirachtin EC and suspension preparations are used, the active ingredients of azadirachtin are decomposed due to the influence of natural factors such as light Faster, short drug effect period, generally 6-10 days, and 2-4 times of pesticide applicat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): A01N43/90A01N43/16A01N25/28A01P7/04
CPCA01N25/28A01N43/16A01N43/90
Inventor 刘旭龚正烈刘虹伶龚葆红陈庆东陈松易春燕杨永利杨东升
Owner INST OF PLANT PROTECTION SICHUAN ACAD OF AGRI SCI
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