Method for preparing pyraflufen-ethyl pesticide sustained or controlled release composite material

The technology of composite material and metazapyr, which is applied in the field of preparation of pesticide slow-release and controlled-release materials, can solve problems such as influence on drug efficacy, waste of petroleum resources, phytotoxicity, etc., so as to reduce agricultural production costs, avoid environmental pollution, and improve the environment. protective effect

Active Publication Date: 2010-09-15
SHANDONG CYNDA CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing pesticide formulations in my country are mainly two types: emulsifiable concentrate (EC) and wettable powder (WP). Among them, emulsifiable concentrate (EC) and wettable powder (WP) account for a large proportion, which contains a large amount of organic solvents, causing a large waste of petroleum resources and seriously polluting the environment; WP requirements The quality of the wetting agent is good, if the suspension is not good, it is easy to precipitate, affecting the efficacy or causing injury
In addition, the existing pesticides still have disadvantages such as large amount of use, poor control effect, and narrow control range.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] A preparation method of pesticide metazachlor slow-controlled release composite material, it comprises the following steps:

[0023] 1). Dissolve 1.5g of metazafen in 13.5g of water, and then ultrasonically disperse (disperse the pesticide metazachlor to form a suspension) to obtain a suspension containing metazafen; the power of the ultrasonic dispersion is 100W, The frequency of the ultrasonic wave is 60 kHz, and the time is 20 minutes;

[0024] 2). Use the "negative pressure-freeze drying method" to load the diatomaceous earth particles with a solution containing metazafen:

[0025] First put 8.5g of diatomite particles with a particle size of 150nm in an airtight container, pump air to make it in a vacuum state and then seal it, then inject the suspension containing metazafen into the container, and metazachlor molecules pass through the negative Pressure infiltration into the nanopores, after 1min (i.e. after reaching equilibrium), freeze-drying (using freeze-dryi...

Embodiment 2

[0033] A preparation method of pesticide metazachlor slow-controlled release composite material, it comprises the following steps:

[0034] 1). Dissolve 3.5g of metazafen in 5.25g of water, and then ultrasonically disperse (disperse the pesticide metazachlor to form a suspension) to obtain a suspension containing metazafen; the power of the ultrasonic dispersion is 100W, The frequency of the ultrasonic wave is 60 kHz, and the time is 20 minutes;

[0035] 2). Use the "negative pressure-freeze drying method" to load the diatomaceous earth particles with a solution containing metazafen:

[0036] First put 7.0g of diatomite particles with a particle size of 800nm ​​in an airtight container, pump air to make it in a vacuum state and then seal it, then inject the suspension containing metazachlor into the container, and metazachlor molecules pass through the negative pressure Infiltrate into the nanopore, after 7 minutes (i.e. after reaching equilibrium), freeze-dry (use freeze-dry...

Embodiment 3

[0044] A preparation method of pesticide metazachlor slow-controlled release composite material, it comprises the following steps:

[0045] 1). Dissolve 5.5g of metazafen in 22g of water, and then ultrasonically disperse (disperse the pesticide metazachlor to form a suspension) to obtain a suspension containing metazafen; the power of the ultrasonic dispersion is 100W, and the ultrasonic The frequency is 60 kHz, and the time is 20 minutes;

[0046] 2). Use the "negative pressure-freeze drying method" to load the diatomaceous earth particles with a solution containing metazafen:

[0047] First put 4.5g of diatomite particles with a particle size of 500nm in an airtight container, pump air to make it in a vacuum state and then seal it, then inject the suspension containing metazafen into the container, and the metazachlor molecule passes through the negative Pressure infiltration into the nanopores, after 10 minutes (that is, after reaching equilibrium), freeze-drying (using fr...

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PUM

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Abstract

The invention relates to a method for preparing a pesticide sustained or controlled release material. A method for preparing a pyraflufen-ethyl pesticide sustained or controlled release composite material is characterized by comprising the following steps of: 1), dissolving pyraflufen-ethyl into water, and then ultrasonically dispersing the pyraflufen-ethyl to obtain suspension containing the pyraflufen-ethyl; 2), loading the solution containing the pyraflufen-ethyl to kieselguhr granules by adopting a 'negative pressure-freeze drying method' to obtain pesticide-loaded kieselguhr granules; and 3) mixing and stirring sodium alginate solution and the kieselguhr granule suspension to obtain a gel system; dripping the obtained gel system into calcium ion cross-linker solution by using an injector to obtain ionic cross-linking gel particles of alginic acid / pesticide-loaded kieselguhr granules; and moistening and washing the gel particles by distilled water, and drying the gel particles with vacuum to obtain the pyraflufen-ethyl pesticide sustained or controlled release composite material. The system can control the sustained release of the pesticide and improve the pesticide effect. The method solves the problems of excessive usage times, overlarge dose, low pesticide utilization rate, poor effect and pollution caused by pesticide loss.

Description

technical field [0001] The invention belongs to the technical field of agricultural medicines, and in particular relates to a preparation method of a slow and controlled release material of agricultural chemicals. Background technique [0002] Pesticides are widely used in agriculture as insecticides and herbicides, and play an important role in the stable production of food all over the world. Except for a few pesticides with high volatility and high solubility in water, which can be used directly, most of them must be processed into preparations before they can be used. The existing pesticide formulations in my country are mainly two types: emulsifiable concentrate (EC) and wettable powder (WP). Among them, emulsifiable concentrate (EC) and wettable powder (WP) account for a large proportion, which contains a large amount of organic solvents, causing a large waste of petroleum resources and seriously polluting the environment; WP requirements The quality of the wetting age...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A01N43/56A01N25/26A01P13/00
Inventor 任红轩余家会黄进王现全
Owner SHANDONG CYNDA CHEM
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