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Pesticide microcapsule

A technology of microcapsules and pesticides, applied in the fields of pesticides, animal repellents, botanical equipment and methods, etc., can solve the problems of difficulty in achieving sustained release, poor sustained release performance, easy oxidative decomposition, etc., and achieve improved stability. , good stability, easy to disperse effect

Active Publication Date: 2022-03-15
YANGZHOU POLYTECHNIC INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For many photosensitive pesticides, such as fipronil and other phenylpyrazole pesticides, they are easy to oxidize and decompose when exposed to light, and they will also decompose quickly and lose their efficacy under ultraviolet radiation. Conventional capsule wall materials cannot prevent this. Pesticide-like pesticides are decomposed by ultraviolet light, resulting in poor sustained-release performance or difficulty in achieving effective sustained-release

Method used

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  • Pesticide microcapsule
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  • Pesticide microcapsule

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0068] A pesticide microcapsule prepared by the following method:

[0069] 1) Add gelatin and dodecylphenol polyoxyethylene ether into deionized water, dissolve at 55°C, and stir at 700r / min to obtain a mixed solution;

[0070] 2) Add fipronil to the mixed solution obtained in step 1), and stir at 3500r / min to form a core material emulsion;

[0071] 3) dissolving chitosan in 0.5% glacial acetic acid solution, adding sodium lignosulfonate under stirring, adjusting the pH value to 7.5, adding calcium chloride, and stirring to obtain a wall material solution;

[0072] 4) Add the core material emulsion obtained in step 2) to the wall material solution obtained in step 3), and stir at 400r / min for 25min;

[0073] 5) Add the reinforcing agent to deionized water, then add γ-methacryloxypropyltrimethoxysilane, stir for 5 minutes, and ultrasonically disperse for 10 minutes to obtain a reinforcing agent dispersion;

[0074] Add the reinforcing agent dispersion to the solution obtained...

Embodiment 2

[0085] A pesticide microcapsule prepared by the following method:

[0086] 1) Add gelatin and dodecylphenol polyoxyethylene ether into deionized water, dissolve at 60°C, and stir at 1000r / min to obtain a mixed solution;

[0087] 2) Add fipronil to the mixed solution obtained in step 1), and stir at 3500r / min to form a core material emulsion;

[0088] 3) dissolving chitosan in 1% glacial acetic acid solution, adding sodium lignosulfonate under stirring, adjusting the pH value to 7.5, adding calcium chloride, and stirring to obtain a wall material solution;

[0089] 4) Add the core material emulsion obtained in step 2) to the wall material solution obtained in step 3), and stir at 600r / min for 25min;

[0090] 5) The reinforcing agent is added to deionized water, and then γ-methacryloxypropyltrimethoxysilane is added, stirred for 7 minutes, and ultrasonically dispersed for 15 minutes to obtain a reinforcing agent dispersion;

[0091] Add the reinforcing agent dispersion to the ...

Embodiment 3

[0102] A pesticide microcapsule prepared by the following method:

[0103] 1) Add gelatin and dodecylphenol polyoxyethylene ether into deionized water, dissolve at 60°C, and stir at 1000r / min to obtain a mixed solution;

[0104] 2) Add fipronil to the mixed solution obtained in step 1), and stir at 4000r / min to form a core material emulsion;

[0105] 3) dissolving chitosan in 1% glacial acetic acid solution, adding sodium lignosulfonate under stirring, adjusting the pH value to 7.5, adding calcium chloride, and stirring to obtain a wall material solution;

[0106] 4) Add the core material emulsion obtained in step 2) to the wall material solution obtained in step 3), and stir at 700r / min for 20min;

[0107] 5) Add the reinforcing agent to deionized water, then add γ-methacryloxypropyltrimethoxysilane, stir for 5 minutes, and ultrasonically disperse for 10 minutes to obtain a reinforcing agent dispersion;

[0108] Add the reinforcing agent dispersion to the solution obtained ...

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Abstract

The invention discloses a pesticide microcapsule which is prepared by the following method: 1) adding gelatin and dodecylphenol polyoxyethylene ether into deionized water, dissolving and stirring to obtain a mixed solution; 2) adding a pesticide into the mixed solution, and stirring to form a core material emulsion; 3) dissolving chitosan in a glacial acetic acid solution, adding sodium lignin sulfonate in a stirring state, then adding calcium chloride, and stirring to obtain a wall material solution; 4) adding the capsule core emulsion into the wall material solution, and stirring; 5) adding the reinforcing agent dispersion liquid, stirring, adding a cross-linking agent, and performing cross-linking curing to obtain a microcapsule solution; and 6) carrying out suction filtration, washing and drying to obtain the microcapsule. The nano titanium dioxide and the sodium lignin sulfonate are introduced into the microcapsule wall material, so that the microcapsule wall material can be endowed with good ultraviolet shielding performance, the compactness and the thermal stability of the wall material can be effectively improved, the microcapsule has good slow release performance, the loss of pesticide can be effectively reduced, and the stability of the pesticide effect of the microcapsule can be improved.

Description

technical field [0001] The invention relates to the field of pesticide preparation, in particular to a pesticide microcapsule and a preparation method thereof. Background technique [0002] Pesticide ingredients in conventional dosage forms have the problems of fast release, easy loss or leaching, low utilization rate, and easy pollution to the environment. High-efficiency, low-toxicity, and environmentally friendly dosage forms have become a new breakthrough in the market competition of the agricultural materials industry. Pesticide microcapsule preparations are more and more widely used because of their good slow-release properties and stability, which can prolong the duration of pesticides and reduce toxicity. Pesticide microcapsules refer to semipermeable or sealed microcapsules formed by coating solid, liquid, and pesticide substances with natural or synthetic polymer capsule wall materials. Capsule wall material has an important influence on the performance and appli...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A01N47/02A01N25/08A01N25/28A01P7/04
CPCA01N47/02A01N25/08A01N25/28Y02A50/30
Inventor 封娜雍达明糜泽强
Owner YANGZHOU POLYTECHNIC INST
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