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Azadirachtin microcapsule suspension and preparation method thereof

A microcapsule suspending agent, azadirachtin technology, applied in the directions of botanical equipment and methods, insecticides, biocides, etc., can solve the problems of increasing agricultural production costs, short drug effect period, waste of oil resources, etc., and achieve effective The effect of prolonging the control time, avoiding the repeated use of pesticides, and having broad application prospects

Inactive Publication Date: 2012-09-12
沈阳东大迪克化工药业有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] It is also known that azadirachtin can inhibit the activity of protease, amylase, lipase, phosphatase and glucose enzyme in insect midgut esterase and fat body, reduce insect feeding rate and conversion utilization rate of food, and can affect insect The normal breathing rhythm of insects reduces the DNA and RNA content in the fat body of insects, reduces the protein, glycogen and lipid content and the activity of some enzymes in female ovaries, oviducts, and seminal vesicles, and affects the reproductive system of male insects, making insects Lesions in the brain, pharyngeal body, cardiac side body, prothymus, fat body, etc., affect the hormone balance in insects, thereby interfering with the growth and development of insects
[0004] When azadirachtin is used, due to the influence of natural factors such as light, the effective components of azadirachtin are decomposed quickly, and the drug effect period is short, generally 6-10 days. Each crop needs to be sprayed 2-4 times. Increased agricultural production costs
[0005] At present, azadirachtin preparations are mostly emulsifiable concentrate products, which contain more than 80% of organic solvents such as toluene and xylene, which not only wastes petroleum resources but also causes environmental pollution and increases toxicity. At the same time, it is easy to cause safety hazards during production. It is also subject to certain restrictions in the selection of transportation, storage and containers

Method used

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  • Azadirachtin microcapsule suspension and preparation method thereof
  • Azadirachtin microcapsule suspension and preparation method thereof

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Experimental program
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Effect test

Embodiment approach

[0021] Embodiment: Below in conjunction with embodiment and experimental method, the present invention will be further described:

[0022] The present invention wraps azadirachtin in a polymer film with trace substances, and completely covers it with various natural or synthetic high molecular compound continuous films (wall or outer phase), while the original chemical properties of azadirachtin Not the slightest damage. After application, the function of azadirachtin is gradually displayed externally through some external stimulation or sustained release, and it relies on the shielding effect of the capsule wall to protect the core material. The diameter of the microcapsules is generally 1~500μm, and the wall thickness is 0.5~150μm. The composition of the suspension is by weight, and its composition mainly includes: 0.1-5 parts of azadirachtin, 0.5-20 parts of organic solvent, 1-25 parts of capsule wall material, 1-20 parts of emulsifying dispersant, 0.2-20 parts of antifree...

Embodiment 1

[0025] Example 1 (Azadirachtin microcapsule suspension product one):

[0026] A kind of azadirachtin microcapsule suspension, prepared according to the following method:

[0027] 1) Preparation of capsule core material: Weigh 0.5 g of azadirachtin and 3.5 g of dimethylformamide to dissolve into a solution, then mix the solution with 0.5 g of 201-A and 0.3 g of polyvinyl alcohol to adjust Stir at a stirring speed of 500 rpm for 20 minutes to make a capsule core material composition;

[0028] 2) Preparation of urea-aldehyde resin prefabrication: weigh urea and formaldehyde in a ratio of 1:2 by weight; pour formaldehyde into the reaction kettle, then add 2 / 3 of urea by volume, and use 5% sodium hydroxide Adjust the PH value of the solution to 8.0, heat the kettle to 50°C, react for 30 minutes, then add the remaining 1 / 3 urea, heat the reaction kettle to 70°C, continue to react for 30 minutes, then cool down to room temperature to obtain Urea-formaldehyde resin preform, spare; ...

Embodiment 2

[0031] Embodiment 2 (Azadirachtin microcapsule suspension product two):

[0032] Weigh 1.5 grams of azadirachtin, 5.5 grams of dimethylformamide and 0.5 grams of Nongru 203-B to make a capsule core material mixture; prepare microcapsules by 7.5 grams of capsule core mixture and 11.5 grams of urea aldehyde resin Polymerization-cured product; finally add 0.3 gram of agricultural milk 203-B, 0.5 gram of methylcellulose, 2.8 gram of glycerol and 1.5 gram of potassium sorbate, and make up to 100% with 75.9 gram of pure water, press embodiment 1 process, The steps are to prepare 100 grams of 1.5% azadirachtin microcapsule suspension.

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Abstract

The invention belongs to the technical field of biopesticides and in particular relates to a new azadirachtin microcapsule suspension and a preparation method and application thereof. The microcapsule suspension is characterized by comprising the following main ingredients in parts by weight: 0.1-5 parts of azadirachtin, 0.5-20 parts of organic solvent, 1-25 parts of wall material, 1-20 parts of emulsifying and dispersing agent, 0.2-6 parts of antifreezing agent, 0.01-1 part of preservative and the balance of purified water, wherein the total parts by weight are 100. The invention aims to solve the problem of environmental pollution and the problems in pest control effects caused by the deficiency of the biopesticide dosage forms in China. The microcapsule suspension has the following advantages: azadirachtin has the characteristics of lasting and stable efficacy and wide range of application; and the safety of existing azadirachtin cream during production and storage and transportation is improved.

Description

Technical field: [0001] The invention belongs to the technical field of biopesticides, in particular to an insecticide containing azadirachtin as an effective drug component and a preparation method thereof. Background technique: [0002] Azadirachtin is a plant-derived insecticide pesticide. More than 100 compounds have been found in neem, and at least 70 compounds have biological activity. They are diterpenoids, triterpenoids, pentatriterpenoids and non-terpenoids . Mainly azadirachtin, azadirachtin, azadirachtin, etc. These active ingredients have the functions of repelling insects, interfering with oviposition, interfering with insect variation, making them unable to metamorphose into adults, repelling larvae and inhibiting their growth to achieve insecticide Purpose. Azadirachtin is the most active compound isolated from neem, which belongs to tetracyclic triterpenoids. Azadirachtin can be divided into 8 kinds of azadirachtin-A, -B, -C, -D, -E, -F, -G, -I. Azadiracht...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A01N43/90A01N25/28A01N25/04A01P7/04
Inventor 谢跃刚许伟
Owner 沈阳东大迪克化工药业有限公司
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