A kind of pesticide sustained-release microcapsule and preparation method thereof

A technology for slow-release microcapsules and pesticides, which is applied in botanical equipment and methods, animal repellents, biocides, etc., can solve problems such as inability to prepare microcapsules, and achieves improved encapsulation effect, easy degradation, and easy use. Effect

Active Publication Date: 2016-08-17
ZHONGKAI UNIV OF AGRI & ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, none of these methods can prepare microcapsules that effectively control the sustained-release effect.

Method used

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  • A kind of pesticide sustained-release microcapsule and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] (1) Weigh 5g of CMC and dissolve it in 100mL of deionized water, stir to fully dissolve.

[0041] (2) Dissolve 10g of chlorpyrifos in 10g of benzene to obtain a 50% pesticide solution, and then mix it with 30g of methyl methacrylate, 20g of butyl acrylate, 10g of methacrylic acid, 5g of ethylene glycol dimethacrylate and azo After 0.3 g of diisobutyronitrile is mixed evenly, it is added into the CMC solution under the action of high-speed shear force, and is fully dispersed to form an emulsion.

[0042] (3) In a 250ml four-neck bottle equipped with a thermometer, a stirring device and a condenser, add 30mL of emulsion and raise the temperature. After the temperature in the bottle rises to 80°C, apply microwave radiation for 1.5h, and the microwave energy density is 0.05W / cm 2 , and start to drop the mixed emulsion of remaining methyl methacrylate 60g, butyl acrylate 50g, methacrylic acid 20g and azobisisobutyronitrile 0.7g, dropwise in 1.5 hours. Then add 12 g of ethyl...

Embodiment 2

[0045] (1) Weigh 10g of CMC and dissolve it in 100mL of deionized water, stir to fully dissolve.

[0046] (2) Dissolve 5g of abamectin pesticide in 45g of toluene to obtain a 10% pesticide solution, and then mix it with 15g of methyl methacrylate, 18g of butyl acrylate, 2g of ethylene glycol diacrylate and 1.5g of azobisiso After the valeronitrile is mixed evenly, it is added into the CMC solution under the action of high-speed shear force, and is fully dispersed to form an emulsion.

[0047] (3) In a 250ml four-necked bottle equipped with a thermometer, a stirring device and a condenser, add 30mL of emulsion and raise the temperature. After the temperature in the bottle rises to 70°C, apply microwave radiation for 2.5h, and the microwave energy density is 0.03W / cm 2 , and began to drop the remaining mixed emulsion of methyl methacrylate 75g, butyl acrylate 85g and azobisisovaleronitrile 0.1g, and finished dropping within 2 hours. Then add 5 g of ethylene glycol diacrylate, con...

Embodiment 3

[0050] (1) Weigh 15g of CMC and dissolve it in 100mL of deionized water, stir to fully dissolve.

[0051] (2) Dissolve 9 g of pyrethroid pesticides in 21 g of ethyl acetate to obtain a 30% pesticide solution, and then mix them evenly with 20 g of methyl methacrylate, 3 g of divinylbenzene and 0.15 g of benzoyl peroxide. Add it into the CMC solution under the action of high-speed shear force, and fully disperse to form an emulsion.

[0052] (3) In a 250ml four-neck bottle equipped with a thermometer, a stirring device and a condenser, add 30mL of emulsion and raise the temperature. After the temperature in the bottle rises to 50°C, apply microwave radiation for 0.5h, and the microwave energy density is 0.05W / cm 2 , and began to drop the remaining mixed emulsion of methyl methacrylate 70g and benzoyl peroxide 0.6g, and finished dropping within 0.5 hours. Then add 7g of divinylbenzene, continue to keep warm for 4 hours, then cool down, filter and dry to obtain the CMC composite ...

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Abstract

The invention discloses a pesticide controlled release microcapsule and a preparation method thereof, and relates to the technical field of controlled release microcapsule pesticide. The preparation method of the invention is as below: adding oil soluble pesticide to an organic solvent, then mixing evenly with acrylate and / or acrylamide unsaturated monomers, an initiator and a crosslinking agent, and then dispersing the mixture to an aqueous solution of carboxyl methyl cellulose to form an emulsion; and then heating the emulsion, applying microwave radiation, supplementing unsaturated monomers, the initiator and the crosslinking agent, and after reaction, insulating, filtering and drying to obtain the pesticide controlled release microcapsule. The method uses CMC as a basic wall material, and can effectively produce the pesticide controlled release microcapsule with required size through the control of process conditions of microwave radiation and addition of unsaturated monomers, so as to realize control of the controlled release rate of the pesticide.

Description

technical field [0001] The invention relates to the technical field of slow-release microcapsule pesticides, and more specifically, to a pesticide slow-release microcapsule and a preparation method thereof. Background technique [0002] Sustained-release agent is a general term for various dosage forms with controlled release ability. It is based on the occurrence rules of harmful organisms, hazard characteristics and environmental conditions, through pesticide processing methods, so that pesticides can be continuously and stably distributed on the target according to the required dose and specific time. Up-release to achieve economical, safe and effective control of harmful organisms. 3M Company Sengupta et al. developed an adhesive pesticide microcapsule and Thies et al. developed a microcapsule that controls drug release through temperature changes. The former is to encapsulate bioactive ingredients such as pyrethroids in adhesives. In the material, the target can be adh...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): A01N25/28A01N57/16A01N43/90A01N53/02
Inventor 周新华龚圣周红军
Owner ZHONGKAI UNIV OF AGRI & ENG
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