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Pesticide microcapsule suspending agent without residual emulsifier and preparation method thereof

A microcapsule suspending agent and emulsifying agent technology, applied in botany equipment and methods, insecticides, biocides, etc., can solve the problems of lack of simple operation and achieve the effect of simple preparation method

Inactive Publication Date: 2020-12-15
JIANGSU ESSENCE AGROCHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to solve the lack of simple operation in the prior art, the product has no residual emulsifier, and the safety and environmental protection of pirimiphos-methyl microcapsule suspension as the core material, the present invention proposes a pesticide microcapsule suspension without residual emulsifier and its Preparation

Method used

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  • Pesticide microcapsule suspending agent without residual emulsifier and preparation method thereof
  • Pesticide microcapsule suspending agent without residual emulsifier and preparation method thereof
  • Pesticide microcapsule suspending agent without residual emulsifier and preparation method thereof

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preparation example Construction

[0033] A preparation method of pesticide microcapsule suspension without residue emulsifier, comprising the steps of:

[0034] S101 mixes pirimiphos-methyl with initiator and capsule wall reaction monomer, and stirs to obtain a dispersed phase;

[0035] Wherein, pirimiphos-methyl and the cyst wall reaction monomer are weighed and proportioned according to the mass ratio of 6:4 to 9:1, and the initiator is 0.5 to 5% of the cyst wall reaction monomer; the above percentages are mass percentages;

[0036] S102 Add a polymerizable emulsifier into deionized water, and stir at 500rpm-2000rpm for 20min to obtain a continuous phase, wherein the polymerizable emulsifier is 0.1%-5% of the continuous phase, and the above percentages are mass percentages;

[0037] S103 Mix the dispersed phase and the continuous phase according to the mass ratio of 1:1 to 1:8, perform high-speed shear emulsification at 10,000 rpm to 20,000 rpm, and the emulsification time is 10 minutes, to obtain a stable m...

specific Embodiment 1

[0046] S201 Weigh 30g of pirimiphos-methyl technical substance, stir with 0.2g of azobisisobutyronitrile, 0.4g of benzoyl peroxide, 20g of methyl methacrylate, and 2g of methacrylic acid to obtain a uniform dispersed phase; S202 Weigh 5g of styrene-maleic anhydride copolymer sodium salt, add 2g of polycarboxylate into 150g of deionized water, stir at 1500rpm for 20min to obtain a uniform continuous phase; High-speed shear emulsification at a rotating speed for 10 minutes to obtain a uniformly dispersed oil-in-water emulsion; S204 raise the temperature of the emulsion to 50°C for polymerization for 2 hours, then raise the temperature to 68°C for 3 hours, and then raise the temperature of the reaction system to 85°C to continue React for 3 hours; after the S205 reaction is completed, the system is cooled naturally, and additives such as viscosity modifier, dispersant and antifreeze are added to the emulsion to obtain a microcapsule suspension with a particle size of 1 μm to 10 μm...

specific Embodiment 2

[0048] S201 weighs 0.4g of benzoyl peroxide, 0.2g of benzoyl peroxide, 0.2g of 50g of pirimiphos-methyl, 24g of methyl methacrylate, and 3g of methacrylic acid and stirs to obtain a uniform dispersed phase; S202 weighs Add 4g of styrene-maleic anhydride copolymer sodium salt, 4g of polycarboxylate into 150g of deionized water, stir at 1500rpm for 20min to obtain a uniform continuous phase; High-speed shearing emulsification for 10 minutes to obtain a uniformly dispersed oil-in-water emulsion; S204 to polymerize the emulsion at 68 ° C, and add 2 g of styrene-maleic anhydride copolymer sodium salt after 3 hours, and continue the reaction for 5 hours; then The temperature of the reaction system is raised to 85°C and the reaction is continued for 3 hours; after the S205 reaction is completed, the system is naturally cooled, and additives such as viscosity modifier, dispersant and antifreeze are added to the emulsion to obtain a microcapsule suspension with a particle size of 1 μm t...

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Abstract

The invention discloses a preparation method of a residue-free emulsifier pesticide microcapsule suspending agent, and the method comprises the following steps: mixing pirimiphos-methyl with an initiator and a capsule wall reaction monomer, and performing stirring to obtain a dispersed phase; adding a polymerizable emulsifier into deionized water, and performing stirring to obtain a continuous phase; mixing the dispersed phase and the continuous phase, and carrying out high-speed shearing emulsification according to a preset rotating speed to obtain a stable mixed solution of an oil-in-water system; heating the mixed solution, performing stirring, carrying out polymerization reaction, and then performing heating for curing; cooling the cured pirimiphos-methyl microcapsule emulsion to roomtemperature, and adding an assistant into the emulsion to obtain the microcapsule suspending agent. The invention also discloses a residue-free emulsifier pesticide microcapsule suspending agent and apreparation method of the residue-free emulsifier pesticide microcapsule suspending agent, wherein the suspending agent comprises a capsule core and a capsule shell; methyrimiphos-methyl is used as amain core material, a wall material is an organic high-molecular polymer, the preparation method is simple, and conditions are mild and easy to control.

Description

technical field [0001] The invention belongs to the technical field of pesticide preparations, in particular to a pesticide microcapsule suspension without residual emulsifier and a preparation method thereof. Background technique [0002] The purpose of pesticide dosage form processing is to maximize the active ingredients of pesticides; pesticide microencapsulation technology uses polymer substrates as capsule walls or capsules, and uses chemical, physical or physicochemical methods to encapsulate solid and liquid raw materials. Drugs and other active substances are coated to form microcapsules with a core (shell) structure and sustained release effect. Compared with conventional pesticides, since the active ingredients of pesticides are coated in a closed or semi-permeable wall membrane, the stability of the original drug is improved, the loss caused by the volatilization of pesticides is reduced, and the compounding ability of pesticides is improved, which can The durat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A01N25/04A01N25/28A01N57/16A01P7/04
CPCA01N25/04A01N25/28A01N57/16
Inventor 南连城张阳洋石伟山周桂东张龙
Owner JIANGSU ESSENCE AGROCHEM
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