Pesticide micro-capsule suspending agent and preparation method thereof

A technology of microcapsule suspensions and pesticides, applied in botany equipment and methods, biocides, animal repellents, etc., can solve problems affecting microcapsule size, wall thickness, capsule wall stability, and complex reaction conditions , to achieve the effect of ensuring the service life, changing the degree of intensity, and simple process

Active Publication Date: 2018-08-03
SHIJIAZHUANG SENTAY CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Although some achievements have been made in the research and application of pesticide microcapsule suspensions, there are still many problems, mainly because the processing technology is complicated, the production cost is high, the technology is difficult, and there are certain investment risks.
The patent with the publication number CN101305725B discloses a compound microcapsule suspension of chlorpyrifos and pymetrozine and its preparation method. The in-situ polymerization method is adopted, that is, the monomers such as formaldehyde and urea or melamine are pre-polymerized in a weak alkaline environment, and adjusted The acidic conditions make the prepolymer molecules cross-link continuously, and deposit an insoluble resin capsule on the surface of the core material. The reaction conditions of this method are complicated, and a small change in the process parameters will affect the size and wall thickness of the microcapsules. The efficacy of the medicine, and the use of volatile raw materials such as formaldehyde also increase the risk of actual production operations
The patent whose publication number is CN103734162B discloses a kind of pyraclostrobin microcapsule suspension, which adopts the interfacial polymerization method, that is, by adding a chain extender, the oil-soluble monomer and the water-soluble monomer undergo polycondensation reaction at the oil-water interface to form a certain The hard capsule shell wraps the active substance. This method is relatively simple, but the reaction time is long, and unreacted monomers and some side reactions will destroy the activity of the capsule core or affect the stability of the capsule wall.

Method used

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  • Pesticide micro-capsule suspending agent and preparation method thereof

Examples

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Effect test

Embodiment 1

[0034] Prepare 20% bifenthrin microcapsules as follows

[0035] 1) Preparation of dispersed phase: 20% bifenthrin, 4% diphenylmethane diisocyanate and 5% calcium dodecylbenzenesulfonate were mixed evenly;

[0036] 2) Preparation of the continuous phase: 4% lignosulfonate, 1% ethylenediamine, 5% organic silicon defoamer and 40% water are stirred evenly;

[0037] 3) Forming of microcapsules: Put the above-mentioned dispersed phase and continuous phase into a stirred tank respectively, the dispersed phase and the continuous phase are equipped with the same injection pump, the dispersed phase stirred tank is injected at a speed of 100mL / min, and the continuous phase stirred tank is injected at a speed of 100 mL / min. Injected at a speed of 200ul / min, the dispersed phase and continuous phase solution form microcapsules in the channel of the microreactor, and the particle size of the microcapsules is between 1-2 microns;

[0038] 4) Curing of microcapsules: the temperature of the mi...

Embodiment 2

[0045] Prepare 30% pirimiphos-methyl microcapsules according to the following steps

[0046] 1) Preparation of dispersed phase: Mix 30% pirimiphos-methyl, 4% diphenylmethane diisocyanate and 3% styrylphenol polyoxyethylene ether;

[0047] 2) Preparation of the continuous phase: 4% of alkylphenol polyoxyethylene ether, 1% of ethylenediamine, 0.5% of silicone defoamer and 20% of water are stirred evenly;

[0048] 3) Forming of microcapsules: Put the above-mentioned dispersed phase and continuous phase into a stirred tank respectively, the dispersed phase and the continuous phase are equipped with the same injection pump, and both stirred tanks are injected at a speed of 100ul / min, the dispersed phase and the continuous phase are injected at a speed of 100ul / min. The phase solution forms microcapsules in the channel of the microreactor, and the particle size of the microcapsules can be between 5-6 microns;

[0049] 4) Curing of microcapsules: the temperature of the microreactor ...

Embodiment 3

[0056] Prepare 50% acetochlor microcapsules according to the following steps

[0057] 1) Preparation of dispersed phase: Mix 50% acetochlor, 4% diphenylmethane diisocyanate and 3% fatty alcohol polyoxyethylene ether;

[0058] 2) Preparation of the continuous phase: 4% modified naphthalenesulfonate, 1% ethylenediamine, 1% polyether defoamer and 20% water are stirred evenly;

[0059] 3) Forming of microcapsules: the above-mentioned dispersed phase and continuous phase are respectively loaded into a stirred tank, the dispersed phase and the continuous phase are equipped with the same injection pump, the dispersed phase stirred tank is injected at a speed of 200ul / min, and the continuous phase stirred tank is injected at a speed of 200ul / min. Injected at a speed of 130ul / min, the dispersed phase and continuous phase solution form microcapsules in the channel of the microreactor, and the particle size of the microcapsules can be between 3-4 microns;

[0060] 4) Curing of the micro...

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Abstract

The invention discloses a pesticide micro-capsule suspending agent and a preparation method thereof. The particle size of the pesticide micro-capsule suspending agent is 0.1 to 20 mu m, the capsule wall adopts a material of polyurethane or polyurea, and a capsule core can be a pyrethroid pesticide, an organophosphorus pesticide or an aniline pesticide. The pesticide micro-capsule suspending agentis prepared through liquid / liquid interface polymerization of a microreactor, the technology is simple, prepared microcapsules are controllable in particle size and are uniform in distribution, a preparation technology of the pesticide micro-capsule suspending agent is simplified, a production amplification effect is reduced, and important value in aspect of pesticide microencapsulation is obtained.

Description

technical field [0001] The invention relates to the technical field of chemical industry, in particular to a pesticide microcapsule suspension and a preparation method thereof. Background technique [0002] Pesticides have made great contributions to increasing agricultural production and farmers' income, but conventional pesticide formulations such as emulsifiable concentrates, powders, wettable powders, oils, etc. have increasingly shown disadvantages such as high toxicity, high residues, and poor environmental compatibility. In recent years, due to the continuous enhancement of people's awareness of environmental protection, polymer materials are used as capsule walls or capsules, and pesticide active substances are wrapped by chemical, physical or physicochemical methods to form a semi-permeable capsule of pesticide microcapsules. Suspending agent is gradually recognized by people. Compared with traditional pesticides, pesticide microcapsule suspensions can reduce the t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A01N25/28A01N25/04A01N53/06A01N57/16A01N37/26
CPCA01N25/04A01N25/28A01N37/26A01N53/00A01N57/16
Inventor 范文娟王丹张小祥秦敦忠
Owner SHIJIAZHUANG SENTAY CHEM CO LTD
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