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Pyrethrin microcapsules and preparation method thereof

A technology of microcapsules and permethrin, applied in botany equipment and methods, animal repellents, biocides, etc., can solve problems such as skin irritation and environmental pollution, and achieve extended service life, good biocompatibility, The effect of mild preparation conditions

Active Publication Date: 2011-02-23
YANGZHOU ZHONGHUI BIOTECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The insecticides currently on the market are mainly based on oil-based and alcohol-based products. Although this type of insecticide has good insecticidal effect and simple production technology, a large amount of organic solvents (such as kerosene, alcohol, etc.) have been used in the preparation process. ), it is irritating to human skin, eyes and respiratory tract after spraying, and pollutes the environment

Method used

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  • Pyrethrin microcapsules and preparation method thereof

Examples

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Comparison scheme
Effect test

Embodiment 1

[0025] Add 2.0g of allethrin and 1.5g of didecyldimethylammonium chloride to 10mL of toluene, heat to 40-45°C, stir and dissolve to form an oil phase, and add the above oil phase to 120mL of 0.5% (mass percentage) in the aqueous solution of alginic acid octylamide, after mixing and stirring, an O / W type emulsion is obtained. Among them, the carbon chain length of aliphatic amine alginate octylamide is C 4～10 .

[0026] Under the condition of stirring, add 20mL 0.05M CaCl dropwise to the O / W emulsion 2 The aqueous solution is cross-linked and solidified. After dropping, continue to stir for 30 minutes to obtain microcapsules wrapped with permethrin and having a particle size of 1-20 μm, such as figure 1 shown.

Embodiment 2

[0028] Add 2.0g of cyhalothrin and 1.5g of didecyldimethylammonium chloride to 10mL of xylene, heat to 40-45°C, stir and dissolve to form an oil phase, and add the above oil phase to 120mL of the same temperature. .5% (mass percentage) octylamide alginic acid aqueous solution, after mixing and stirring, an O / W type emulsion is obtained. Among them, the carbon chain length of aliphatic amine alginate octylamide is C 4～10 .

[0029] Under the condition of stirring, 4 mL of HAc was added dropwise to the emulsion for cross-linking and solidification. After the dropping was completed, the stirring was continued for 30 min to obtain microcapsules wrapped with permethrin and having a particle size of 1-20 μm.

Embodiment 3

[0031] Add 1.0g tetramethrin, 1.0g cypermethrin and 1.5g didecyldimethylammonium chloride to 10mL ethyl acetate, heat to 40-45°C, stir and dissolve to form an oil phase, add the above oil phase to the same In 120mL of 0.5% (mass percentage) octylamide alginic acid aqueous solution at 120mL temperature, after mixing and stirring, an O / W type emulsion is obtained. Among them, the carbon chain length of aliphatic amine alginate octylamide is C 4～10 .

[0032] Under the condition of stirring, first drop 10mL 0.05M CaCl into the emulsion 2 The aqueous solution is cross-linked and solidified. After dropping, stir for 30 minutes, then add 2 mL of HAc dropwise therein, and continue stirring for 5 minutes to obtain microcapsules with a particle size of 1-20 μm coated with permethrin.

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Abstract

The invention discloses pyrethrin microcapsules and a preparation method thereof, and relates to the technical field of production of pesticides. The method comprises the following steps of: mixing alginate amidation derivative and water to form aqueous solution of alginate amide, wherein the length of a fatty amine carbon chain of the alginate amide of the alginate amidation derivative is C4-10;mixing pyrethrin, organic solvent and oil-soluble quaternary ammonium salt to form an oil-phase mixture; stirring the aqueous solution of the alginate amide and the oil-phase mixture uniformly in a thermostatic water bath of between 40 and 45 DEG C to form emulsion; and dropping a cross linker into the prepared emulsion drop by drop, continuously stirring the mixture after the dropping is finished to perform gelatinization reaction so as to prepare the pyrethrin microcapsules with grain size of 1 to 20 microns. The method has simple preparation steps and mild preparation conditions, and does not reduce the effect of the coated pyrethrin.

Description

technical field [0001] The invention relates to the technical field of pesticide production, in particular to the technical field of microcapsule pesticide production. Background technique [0002] Pyrethrin has the characteristics of broad-spectrum insecticide, high efficiency, fast speed and long-lasting effect, so it is widely used in various insecticide fields, including the control of household hygiene pests, for mosquitoes, flies, cockroaches and beetles and other pests The killing effect is excellent. [0003] The insecticides currently on the market are mainly based on oil-based and alcohol-based products. Although this type of insecticide has good insecticidal effect and simple production technology, a large amount of organic solvents (such as kerosene, alcohol, etc.) have been used in the preparation process. ), it is irritating to human skin, eyes and respiratory tract after spraying, and pollutes the environment. [0004] Microcapsule dosage form is a new type ...

Claims

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Application Information

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IPC IPC(8): A01N53/08A01P7/04A01N25/28A01N53/10A01N53/04
Inventor 杨继生任海兵
Owner YANGZHOU ZHONGHUI BIOTECH