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Environment-friendly carbon dioxide-based polymer imidacloprid-loading microcapsule and method for preparing the same

An environment-friendly, carbon dioxide-based technology, applied in botany equipment and methods, insecticides, animal repellents, etc., can solve problems such as unsuitable for industrial production, prone to micro-cracks, complicated preparation process, etc., and achieve obvious economical Benefits and social benefits, reduced production costs and use costs, simple preparation process

Inactive Publication Date: 2015-09-30
QINGDAO AGRI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the slow-release research of imidacloprid is relatively active. For example, Chinese patent CN1817136A reports a granule made of imidacloprid and its preparation method. This granule is only suitable for the environment with wet field mud in the field, and its use is limited.
Chinese patent CN101455197A reports a method for preparing photodegradable nano-imidacloprid microcapsules, using nano-TiO 2 As a photodegradant, the cost of raw materials is relatively high, so the product price is relatively expensive, and it is difficult to promote in the market
Chinese patent CN101971854B reports a controlled-release imidacloprid insecticidal granule and its preparation method. Sulfur is used as a controlled-release material, and sulfur is brittle and prone to tiny cracks, which affects the slow-release effect
Chinese patent CN101194624B reports imidacloprid / hydrotalcite-like nano-hybrid and its preparation method, using hydrotalcite-like nano-hybrid, the preparation process of this type of nano-hybrid is complicated, and the reaction time is 4 days, which is not suitable for industrial production
Chinese patent CN100442975C ​​reports the adoption of a slow-release pesticide granule with a lower drug load

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] A preparation method for environment-friendly carbon dioxide-based polymer-loaded imidacloprid microcapsules, comprising the following steps:

[0020] (1) Dissolve 1g of binary alternating copolymer with a molecular weight of 20000g / mol carbon dioxide-cyclopropylene oxide and 1g of imidacloprid original drug in dichloromethane, stir to dissolve completely, and then pour into 1% PVA-1788 In the solution, use a disperser to disperse and emulsify at a high speed, and emulsify at a stirring speed of 10,000 rpm for 5 minutes. Then at room temperature, the stirring speed was at 200 rpm, the dichloromethane was completely volatilized, centrifuged, washed with distilled water 4 times, and the solid was dried in a freeze dryer for 48 hours.

[0021] The imidacloprid microcapsules prepared in this example contain 78% carbon dioxide copolymer, 22% imidacloprid, an encapsulation rate of 75%, a particle size of 5.21 μm, and no holes in the capsule wall. The imidacloprid microcapsul...

Embodiment 2

[0023] A preparation method for environment-friendly carbon dioxide-based polymer-loaded imidacloprid microcapsules, comprising the following steps:

[0024] (1) Dissolve 0.6g of terpolymer of carbon dioxide-propylene oxide-maleic anhydride with a molecular weight of 15000g / mol and 0.4g of imidacloprid original drug in 15ml of tetrahydrofuran, stir to dissolve completely, and then pour it into 30ml of Span- In an aqueous solution with a concentration of 80 of 120mg / mL and a gelatin concentration of 0.3%, use a disperser to disperse and emulsify at a high speed, and emulsify at a shear rate of 7000rpm for 10min. Then, at room temperature, with a stirring speed of 300 rpm, the tetrahydrofuran was completely volatilized, centrifuged, washed with distilled water for 3 times, and the solid was dried in a freeze dryer for 50 hours.

[0025] The imidacloprid microcapsules prepared in this example contain 68% carbon dioxide copolymer, 32% imidacloprid, an encapsulation rate of 85%, a ...

Embodiment 3

[0027] A preparation method for environment-friendly imidacloprid microcapsules, comprising the following steps:

[0028] (1) Dissolve 0.8g of a terpolymer of carbon dioxide-propylene oxide-γ-butyrolactone with a molecular weight of 9000g / mol and 0.6g of imidacloprid original drug in 2ml of acetone and 13ml of tetrahydrofuran, stir to dissolve completely, and then pour Pour into 30ml of an aqueous solution with a concentration of 0.08% of sodium lauryl sulfate and a concentration of 0.3% of PVA-1788, disperse and emulsify at a high speed with a disperser, and emulsify at a stirring speed of 5000 rpm for 15 minutes. Then at room temperature, the stirring speed was at 200 rpm, the chloroform was completely volatilized, centrifuged, washed 5 times with distilled water, and the solid was dried in a freeze dryer for 55 hours.

[0029] The imidacloprid microcapsules prepared in this example contain 72% carbon dioxide copolymer, 28% imidacloprid, an encapsulation efficiency of 75%, a...

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PUM

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Abstract

The invention discloses an environment-friendly carbon dioxide-based polymer imidacloprid-loading microcapsule and a method for preparing the same. A completely biodegradable carbon dioxide-based polymer serves as a capsule wall material, imidacloprid serves as a core material, a solvent volatilization method is adopted to prepare the carbon dioxide-based polymer imidacloprid-loading microcapsule. The microcapsule comprises, by mass percentage, 40-95% of carbon dioxide-based polymer and 5-60% of imidacloprid. The synthetic method is simple and practical, the pesticide loading amount of the prepared microcapsule can be controlled to be 8-50%, the controlled release effect of imidacloprid is good, and the environment-friendly carbon dioxide-based polymer imidacloprid-loading microcapsule prolongs duration, reduces pesticide application amount and soil and environmental pollution caused by pesticides and conforms to green agriculture development with efficient utilization and reduced use of pesticides.

Description

technical field [0001] The invention relates to the technical field of production of pesticide microcapsules, in particular to an environment-friendly carbon dioxide-based polymer-loaded imidacloprid microcapsule and a preparation method thereof. Background technique [0002] Imidacloprid belongs to the systemic insecticides of nitromethylene, and also belongs to a new generation of chlorinated nicotine insecticides. It has the characteristics of broad spectrum, low toxicity, low residue and high efficiency. Different degrees of drug resistance or drug resistance will occur, especially pests such as whitefly, aphids and cotton aphids on vegetables, melons, and fruit trees have a greater risk of developing resistance to imidacloprid. Therefore, when imidacloprid is used to control such pests, the dosage is increased in order to improve the control effect, which easily causes its residue on crops. The preparation of such products by microencapsulation technology is an importan...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A01N25/28A01N51/00A01P7/04A01P7/02
Inventor 李红春牛永盛郑乔红张保华
Owner QINGDAO AGRI UNIV