Slow/controlled-release microcapsule pesticide and preparation method thereof

A technology of microcapsules and pesticides, applied in the field of slow/controlled release microcapsule pesticides and its preparation, can solve problems such as the limitation of the application of microcapsule pesticides, the lack of controllability of the slow/controlled release performance of microcapsules, etc., and achieve good environmental stability performance, improve environmental stability, and solve the effect of loss

Active Publication Date: 2013-10-09
CHINA AGRI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0016] At present, there are few studies on the influence of physical properties such as softness, hardness and viscosity of acrylate microcapsules on environmental stability, and the con

Method used

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  • Slow/controlled-release microcapsule pesticide and preparation method thereof
  • Slow/controlled-release microcapsule pesticide and preparation method thereof
  • Slow/controlled-release microcapsule pesticide and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] Embodiment 1, preparation slow / controlled release microcapsule pesticide

[0058] Dissolve 0.1g of OP-10 and 0.2g of SDS in 40g of water to form solution I. Add solution I into a 250mL four-necked flask, install a mechanical stirring device, a condenser, and a heating mantle, and raise the temperature to 60°C.

[0059] Dissolve 0.15g of OP-10 and 0.4g of SDS in 35g of water, and add it to a 500mL three-necked flask with a dropper, and install a mechanical stirring device. Dissolve 2 g of chlorpyrifos in 30 g of reaction monomer mixture (ethyl acrylate: styrene weight ratio 50:50) to form an oil phase, add it to the above-mentioned three-necked flask, stir at 1500 rpm for 10 min to form emulsion I.

[0060] 0.25 g of ammonium persulfate (APS) and 0.25 g of sodium bisulfite (SBC) were dissolved in 15 g of water as initiators.

[0061] Dissolve 0.5 g of ethylene glycol dimethacrylate in 3 g of reaction monomer mixture (ethyl acrylate: styrene by weight ratio 50:50) to for...

Embodiment 2

[0065] Embodiment 2, preparation slow / controlled release microcapsule pesticide

[0066] Dissolve 0.2g of OP-10 and 0.2g of LAS in 40g of water to form solution I. Add solution I into a 250mL four-necked flask, install a mechanical stirring device, a condenser, and a heating mantle, and raise the temperature to 60°C.

[0067] Dissolve 0.25g of OP-10 and 0.4g of LAS in 35g of water, and add it to a 500mL three-necked flask with a dropper, and install a mechanical stirring device. Dissolve 5g dimethoate in 30g reaction monomer mixture (methyl methacrylate: vinyl acetate: acrylic acid by weight ratio 45:47:8) to form an oil phase, add it to the above-mentioned three-necked flask, stir at 1500rpm for 10min to form an emulsion I.

[0068]0.3g of APS and 0.3g of SBC were dissolved in 15g of water as initiators.

[0069] Dissolve 1g of butanediol diacrylate in 6g of reaction monomer mixture (methyl methacrylate: vinyl acetate: acrylic acid: 45:47:8 by weight) to form coating soluti...

Embodiment 3

[0072] Embodiment 3, preparation slow / controlled release microcapsule pesticide

[0073] Dissolve 0.2g OP-10 and 0.2g LAS in 40g water to form solution I, add solution I into a 250mL four-necked flask, install a mechanical stirring device, a condenser tube, and a heating mantle, and raise the temperature to 60°C.

[0074] Dissolve 0.25g of OP-10 and 0.4g of LAS in 40g of water, and add it to a 500mL three-necked flask with a dropper, and install a mechanical stirring device. Dissolve 10g of malathion in 30g of reaction monomer mixture (methyl methacrylate: ethyl acrylate: hydroxyethyl acrylate: butyl methacrylate by weight ratio 45:45:7:3) to form an oil phase, Add it to the above-mentioned three-necked flask, and stir at 1500rpm for 10min to form emulsion I.

[0075] 0.3g APS and 0.3g SBC were dissolved in 20g water to form the initiator.

[0076] Dissolve 1 g of hexanediol dimethacrylate in 8 g of reactive monomer mixture (methyl methacrylate: ethyl acrylate: hydroxyethyl ...

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Abstract

The invention discloses a slow/controlled-release microcapsule pesticide and a preparation method thereof. The preparation method for the slow/controlled-release microcapsule pesticide comprises the following steps of: (1) dissolving an emulsifier into water to obtain a solution recorded as a solution I, and heating the solution to 40-70 DEG C; (2) dissolving a polymerization monomer, a pesticide and an emulsifier into water to obtain emulsion recorded as emulsion I; (3) dissolving a crosslinking agent into the polymerization monomer to obtain a solution recorded as envelope liquid I; (4) mixing the solution I and the emulsion I, and performing polymerization under the action of an initiator so as to obtain a microcapsule pesticide core material; and (5) adding the envelope liquid I into a reaction system in the step (4) for reaction, thus obtaining an envelope film covering the microcapsule pesticide core material, and further obtaining the slow/controlled-release microcapsule pesticide. The physical property of the envelope material formed by the method can be adjusted and controlled by changing the proportion of the polymerization monomer and the content of the crosslinking agent, so that the release period of active ingredients of the pesticide can be flexibly controlled, and the environment stability of microcapsules is greatly improved.

Description

technical field [0001] The invention relates to a slow / controlled release microcapsule pesticide and a preparation method thereof. Background technique [0002] The use of pesticides can effectively control pests and increase food production. According to related reports, the use of pesticides in the world can increase grain by 300-350 million tons every year. If pesticides are not used, the annual loss of grain production due to pests and diseases will be as high as 35%, and the world's grain production will drop sharply. Therefore, the rational use of pesticides is an effective way to solve the world's food problems and increase food production. However, the mass production and widespread use of highly toxic pesticides have directly affected human health and the environment. Most organic pesticides have high volatility and other environmental instability, resulting in only 20% to 30% of them being utilized when they are applied. The low utilization rate of pesticides and...

Claims

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Application Information

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IPC IPC(8): A01N25/28B01J13/14
Inventor 胡树文汪玉高子登
Owner CHINA AGRI UNIV
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