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Method for preparing controlled release type nano pesticide

A nanoscale, pesticide technology, applied in botany equipment and methods, animal husbandry, biocides, etc., can solve the problems of poor target adhesion and penetration, low pesticide content, high preparation cost, etc., to reduce the number of spraying, High polymerization efficiency and improved utilization

Inactive Publication Date: 2009-06-24
BETA CHEM LTD
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  • Summary
  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

The microcapsules prepared by the above-mentioned methods can play the role of sustained release, but due to the large particle size, the adhesion and penetration ability to the target are poor during use.
[0004] The article "Journal of Beijing University of Chemical Technology", Volume 34, Issue 4, 2007, 337-340, reported that SiO 2 As a sustained-release carrier, abamectin solid powder nano-sustained-release agent was prepared by supercritical embedding method. The particle size of the powder was 200-500nm after water dispersion. This type of preparation has sustained-release performance, and the particle size However, there are still disadvantages of low load rate
In the article "Polymer Materials Science and Engineering", Volume 24, No. 2, 35-38, 2007, the microemulsion polymerization method was used to prepare pesticide microcapsules. Although the particle size of the microcapsules reached the nanometer level, a large amount of emulsifiers needed to be added, and pesticides Low content, high preparation cost

Method used

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Examples

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Effect test

preparation example Construction

[0015] The method for preparing controlled-release nanoscale pesticides provided by the invention, the specific steps are as follows:

[0016] 1) Add the surfactant to the water and mix well.

[0017] 2) Mix monomers, cross-linking agents and non-polar pesticides evenly.

[0018] 3) Add the oil phase of step 2) to the water phase of step 1), and vigorously shear and stir at a high speed to obtain a fine emulsion.

[0019] 4) Add the miniemulsion into a four-neck flask equipped with a thermometer, magnetic stirring, reflux condensation and nitrogen protection, add an initiator to initiate polymerization, and obtain the controlled-release nanoscale pesticide provided by the present invention.

Embodiment 1

[0022] 1) 0.2g sodium dodecyl sulfate (SDS) was dissolved in 90g deionized water to obtain 0.22% emulsifier aqueous solution;

[0023] 2) Mix 1.5g methyl acrylate, 6.0g styrene, 1.0g butylene diacrylate and 1.2g abamectin evenly;

[0024] 3) Mix the water phase and the oil phase, and emulsify at high speed in an ice-water bath for 10 minutes to obtain a fine emulsion;

[0025] 4) Then add the fine emulsion to a flask equipped with a condensing device, stirring, nitrogen inlet, and feeding port. After passing nitrogen for 30 minutes, keep it in a water bath at 65°C, and add 0.1g of azobisisobutyronitrile at the same time to initiate polymerization, and keep polymerization for 2 hours , to obtain the mass percent is 1.2% abamectin nanocapsules.

[0026] Observed by a scanning electron microscope, it is a uniform sphere with an average particle size of 60nm. Detection by high performance liquid chromatography (HPLC) has a suspension rate of 96%, and a loading rate of 94%.

Embodiment 2

[0028] 1) 0.6g alkylphenol formaldehyde resin polyoxyethyl ether (700 # ) and 0.2g calcium dodecylbenzenesulfonate (500 # ) was dissolved in 80g deionized water to obtain an aqueous solution of 1.0% emulsifier;

[0029] 2) Mix 3.6g methyl methacrylate, 4.0g divinylbenzene, 8g styrene, and 3.5g dimethomorph evenly;

[0030] 3) Mix the water phase and the oil phase, and shear emulsify in an ice-water bath for 10 minutes to obtain a fine emulsion;

[0031] 4) Then add the fine emulsion to a flask equipped with a condensing device, stirring, nitrogen inlet, and feeding port. After passing nitrogen for 30 minutes, keep it in a water bath at 70°C, and add 0.1g of azobisisobutyronitrile at the same time to initiate polymerization, and keep polymerization for 4 hours , to obtain a mass percentage of 3.5% dimethomorph nanocapsules.

[0032] Observed by a scanning electron microscope, it is a uniform sphere with an average particle size of 75nm. Detection by high performance liquid ...

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Abstract

The invention discloses a method of preparing moderated nm-grade pesticide, comprising: cutting and emulsifying water-insoluble pesticide, unsaturated monomers, crosslinking agent and surface active agent, obtaining fine solution, triggering copolymerization through initiator, forming nm-grade microcapsule on a surface of the pesticide, obtaining the moderated nm-grade pesticide. The method not only eliminates pesticide burst in the pesticide, but also increases pesticide loading factor, thereby reducing application times of the pesticide, reducing pressure on environment and increasing utilization factor of the pesticide.

Description

technical field [0001] The invention relates to a method for preparing a controlled-release nano-scale pesticide, in particular to a method for preparing a controlled-release nano-scale pesticide by using a miniemulsion polymerization method. Background technique [0002] The loss and decomposition of pesticides caused by wind, sun, and rain in traditional pesticide application methods usually reach 60% to 90%. Therefore, repeated spraying will double the amount of pesticides, resulting in huge waste and harm. It is particularly important to focus on the improvement of the processing dosage forms and formulations of existing pesticide varieties, the improvement of physical and chemical properties and application methods, and the development of new applications. The pesticide is made into a pesticide slow-release agent that can reach the required place continuously and stably within a specific period of time according to the necessary dose, so as to maintain a sufficient dura...

Claims

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Application Information

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IPC IPC(8): A01N25/04A01N25/28
Inventor 曹永松钱坤石天玉汤涛王芳李平亮李健强
Owner BETA CHEM LTD
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