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Pesticide microcapsule and preparation method thereof

A technology for microcapsules and pesticide preparations, which is applied in the field of pesticide herbicide microcapsules and their preparation, can solve problems such as poisoning to applicators, adverse effects on mammals, environmental pollution, etc., so as to control the release of pesticides and increase the encapsulation amount of pesticides. , the effect of abundant yield

Inactive Publication Date: 2012-03-21
INST OF CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Traditional dosage forms are often difficult to give full play to the activity of pesticides, and are toxic to applicators, and the use of organic solvents will cause environmental pollution and adverse effects on mammals

Method used

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  • Pesticide microcapsule and preparation method thereof
  • Pesticide microcapsule and preparation method thereof
  • Pesticide microcapsule and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Example 1. Preparation of pesticide microcapsules with natural kapok fiber microtubes encapsulating lactofen-gelatin gel

[0040] (1) Pre-treatment of natural microtubules

[0041] Cut 1g natural kapok fiber to 300-350μm with mechanical external force.

[0042] (2) Lactofop-ethyl-gelatin filled kapok microtubules

[0043] Add 10mL Lactofop-ethyl and 0.01g PEG-PPG-PEG (polyethylene glycol-polypropylene glycol-polyethylene glycol, Mn~14600) into 15ml water to make an emulsion, heat, and dissolve 6g gelatin in the emulsion in. Disperse 1 g of the chopped natural microtubes in the mixed solution and soak so that the natural microtubes are filled with the mixed solution.

[0044] (3) Filtering and cleaning the kapok in step (2), cooling to gelatinize the gelatin, and obtaining pesticide microcapsules with kapok fiber microtubes encapsulating lactofen-gelatin gel.

[0045] The encapsulation rate of the obtained lactofen-gelatin gel pesticide microcapsules is 35%.

Embodiment 2

[0046] Example 2. Preparation of pesticide microcapsules with natural kapok fiber microtubes encapsulating metapyrazin EC-agar gel

[0047] (1) Pre-treatment of natural microtubules

[0048] Cut 1g natural kapok fiber to 300-350μm with mechanical external force.

[0049] (2) Metatraclofen EC-agar filled kapok microtubes

[0050] Add 8mL metazofen EC and 0.005g PEG-PPG-PEG (Mn-14600) into 25ml water to prepare an emulsion, heat, and dissolve 2g agar in the emulsion. Disperse the chopped natural microtubes in the mixed solution and soak so that the natural microtubes are filled with the mixed solution.

[0051] (3) Filter and wash the kapok in step (2), cool to gel the agar, and obtain pesticide microcapsules in which the kapok fiber microtubes encapsulate metazachlor EC-agar gel.

[0052] The encapsulation rate of the obtained metazofen EC-agarose pesticide microcapsules is 30%.

Embodiment 3

[0053] Example 3. Preparation of pesticide microcapsules with natural kapok fiber microtubes encapsulating refined haloxyfop-calcium alginate gel

[0054] (1) Pre-treatment of natural microtubules

[0055] Cut 1g natural kapok fiber to 900-1000μm with mechanical external force.

[0056] (2) Chloroxyfop-sodium alginate filled kapok microtubules

[0057] Add 5 mL of haloxyfop and 0.001 g of octylphenol polyoxyethylene ether to 20 mL of water to prepare an emulsion, and dissolve 3 g of sodium alginate in the emulsion. Disperse the chopped natural microtubes in the mixed solution and soak so that the natural microtubes are filled with the mixed solution.

[0058] (3) Filter and clean the kapok in step (2), and put in 0.1mol / L CaCl 2 In the solution, the calcium alginate gel is obtained, that is, the pesticide microcapsules in which the kapok fiber microtubes encapsulate the refined haloxyfop-calcium alginate gel are obtained.

[0059] The encapsulation rate of the obtained refined haloxyfop...

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Abstract

The invention discloses a pesticide herbicide microcapsule and a preparation method thereof. The pesticide microcapsule comprises a capsule core and a capsule wall. The capsule core is a high-molecular gel embedded with pesticide; and the capsule wall is natural fibre or a composite capsule wall with a high-molecular material cladded the natural fibre. The preparation method is as below: 1) mixing the pesticide, an emulsifier, water and gel monomer to prepare an emulsion; 2) dispersing the natural fibre in the emulsion and immersing to fill microtubules of the natural fibre with emulsion; 3) filtering and collecting natural fibre full of emulsion, carrying out gelating or crosslinking solidification on the gel monomers in the emulsion to form gel and obtaining the pesticide microcapsule. When preparing the composite capsule wall, hollow fiber needs to be further cladded by the high-molecular material. The bombax cotton employed by the invention is an environment friendly cheap and easily available natural plant microtubule with large degree of hollowness and has characteristics of high packaging amount, low cost ad slow release, etc., when used as the pesticide microcapsule.

Description

Technical field [0001] The invention relates to a pesticide herbicide microcapsule and a preparation method thereof. Background technique [0002] The purpose of pesticide formulation processing is to maximize the effective ingredients of pesticides. Traditional formulations are often difficult to give full play to the activity of pesticides and are toxic to the applicator. The use of organic solvents will cause environmental pollution and adverse effects on mammals. Many problems force people to develop new alternative dosage forms. Pesticide microcapsules are one of the new pesticide formulations. Pesticide microcapsules use microcapsule technology to coat solid and liquid pesticides and other active substances in the capsule wall material to form microcapsules. Compared with conventional pesticides, since the active ingredients of the pesticides are coated in a closed or semi-permeable wall membrane, the capsule wall can improve the rain resistance and light resistance of t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A01N25/28A01N43/56A01N43/40A01N43/18A01N37/40A01N37/26A01P13/00
Inventor 段春婷龙宇华余晓兰张晓艳赵宁张小莉徐坚
Owner INST OF CHEM CHINESE ACAD OF SCI
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