A kind of glycosylated pesticide nano-microcapsule and preparation method thereof

A nano-microcapsule and glycosylation technology, applied in botany equipment and methods, chemicals for biological control, fungicides, etc., can solve the problem of difficult particle size control, unsuitable for industrial production, low loading rate, etc. problems, to achieve the effect of increasing the degradable characteristics, improving the utilization rate of pesticides, and increasing the adhesion performance

Active Publication Date: 2021-12-17
SHANDONG AGRICULTURAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] First, the preparation is difficult. The methods for preparing pesticide nanocapsules reported in the literature include emulsion polymerization, solvent evaporation, nanoprecipitation, and complex coacervation. Among them, interfacial polymerization is the most widely used method for preparing pesticide microcapsules. Due to the high reaction rate, the particle size of nanocapsules cannot be precisely controlled, which makes it difficult to control the final product. These methods are not suitable for industrial production
[0005] Two, the loading rate is low; one of the key problems of the above problems is the selection of the stabilizer. If the stabilizer is not well selected, capsule breakage will occur during the preparation process, resulting in a low loading rate and an increase in the particle size of the emulsion. Difficult to control particle size
[0006] A solution to the above technical problems has not yet been found

Method used

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  • A kind of glycosylated pesticide nano-microcapsule and preparation method thereof
  • A kind of glycosylated pesticide nano-microcapsule and preparation method thereof
  • A kind of glycosylated pesticide nano-microcapsule and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Weigh 3.00g of dried starch in a single-necked flask; weigh 1.76g of p-toluene isocyanate, mix p-toluene isocyanate with 20.00g of anhydrous ethyl acetate and add it to the single-necked flask containing starch, Install the spherical condenser, place in a water bath at 80°C, start magnetic stirring, and stop heating after 8 hours of reaction. Suction filtration, repeated washing with ethanol to obtain toluene isocyanate modified starch (modified starch A), dried for later use.

[0042] Weigh 9.28g of 97% pyraclostrobin technical substance, dissolve it with 9g of cyclohexanone and 1g of xylene, and then add 1.00g of diphenylmethane diisocyanate to form the oil phase.

[0043] Weigh 9g styrylphenol polyoxyethylene polyoxypropylene ether (emulsifier), 10g calcium lignosulfonate (dispersant) and 0.85g modified starch A (stabilizer), dissolve in 60g water, which is the water phase .

[0044] The oil phase and the water phase were mixed and ultrasonically emulsified for 11 ...

Embodiment 2

[0046]Weigh 3.00g of dried starch in a single-necked flask; weigh 2.15g of 4-ethylphenylisocyanate, mix 4-ethylphenylisocyanate with 20.00g of anhydrous ethyl acetate and add it to In the single-necked flask filled with starch, install a spherical condenser, place it in a water bath at 80°C, start magnetic stirring, and stop heating after reacting for 8 hours. Suction filtration and repeated washing with ethanol to obtain 4-ethylphenylisocyanate modified starch (modified starch B), which was dried for later use.

[0047] Weigh 9.28g of 97% pyraclostrobin technical substance, dissolve it with 9g of cyclohexanone and 1g of xylene, and then add 1.00g of diphenylmethane diisocyanate to form the oil phase.

[0048] Weigh 9g styrylphenol polyoxyethylene polyoxypropylene ether (emulsifier), 10g calcium lignosulfonate (dispersant) and 0.85g modified starch B (stabilizer), dissolve in 60g water, which is the water phase .

[0049] The oil phase and the water phase were mixed and ultr...

Embodiment 3

[0051] Weigh 3.00g of dried starch in a single-necked flask; weigh 2.35 g of 4-isopropylphenylisocyanate, mix 4-isopropylphenylisocyanate with 20.00g of anhydrous ethyl acetate and add it to the container In the single-necked flask with starch, install a spherical condenser, place it in a water bath at 80°C, start magnetic stirring, and stop heating after 8 hours of reaction. Suction filtration, repeated washing with ethanol to obtain 4-isopropylphenylisocyanate modified starch (modified starch C), dried for later use.

[0052] Weigh 9.28g of 97% pyraclostrobin technical substance, dissolve it with 9g of cyclohexanone and 1g of xylene, and then add 1.00g of diphenylmethane diisocyanate to form the oil phase.

[0053] Weigh 9g styrylphenol polyoxyethylene polyoxypropylene ether (emulsifier), 10g calcium lignosulfonate (dispersant) and 0.85g modified starch C (stabilizer), dissolve in 60g water, which is the water phase .

[0054] The oil phase and the water phase were mixed a...

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Abstract

The invention discloses a glycosylated pesticide nano-microcapsule and a preparation method thereof, belonging to the technical field of pesticide microcapsules. The invention consists of a capsule core and a capsule shell, the capsule core is the pesticide active component, and the capsule shell is formed by polyurea and isocyanate modified starch embedded therein. Isocyanate-modified starch is used as a stabilizer. Due to the special structure of the stabilizer, it can be firmly adsorbed on the oil-water interface. During the formation of the capsule wall, the emulsion is very stable, which effectively inhibits the increase in the particle size of the nano-emulsion droplets. The particle size increases. During the reaction of the capsule wall, the starch chains of the polymer are embedded in the new polyurea capsule shell. Due to the existence of the starch chain, the degradable characteristics of the capsule shell are increased and the impact on the environment is reduced. Pollution.

Description

technical field [0001] The invention relates to the technical field of pesticide microcapsules, in particular to a glycosylated pesticide nanocapsule and a preparation method thereof. Background technique [0002] Nanoscience has developed into one of the three pillar sciences in the world today. In recent years, nanotechnology has been introduced into the field of agriculture. Pesticide nanocapsules are a drug-loading system with a particle size in the nanometer scale, which can reduce the dosage of the drug and improve the efficacy of the drug. Nano-pesticides are not only a simple change in the formulation of the pesticide, but a substantial change in the pesticide processing process will lead to a significant improvement in the effect of the pesticide after application. The introduction of nano-materials makes it easier for nano-pesticides to be absorbed by plants and absorbed through body surface tissues, thus improving the efficacy of the pesticides. It inhibits the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): A01N25/28A01N47/24A01N53/08A01N53/06A01N43/58A01N43/40A01N43/653A01N47/38A01N43/90A01P3/00A01P1/00A01P7/04
CPCA01N25/28A01N43/40A01N43/58A01N43/653A01N43/90A01N47/24A01N47/38A01N53/00
Inventor 刘峰慕卫张大侠罗健刘广
Owner SHANDONG AGRICULTURAL UNIVERSITY
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