Pesticide microcapsules produced by layer-by-layer self-assembly

A layer-by-layer self-assembly and microcapsule technology, which is applied in the direction of microcapsule preparation, microsphere preparation, botanical equipment and methods, etc., to achieve the effect of reducing the number and frequency, reducing the loss of pesticides, and accelerating the degradation of residues

Inactive Publication Date: 2015-02-25
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But because the research on the preparation method of existing pesticide microcapsules has reached the bottleneck period, it is urgent to introduce new methods to prepare pesticide microcapsules

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0014] Step 1. Preparation of pesticide suspension: Weigh a certain amount of pesticide, dissolve it in an organic solvent, add an aqueous solution containing a surfactant, and then stir rapidly in a mixer at 700-1250r / min for 10-15 minutes to obtain oil-in-water The pesticide suspension A consists of pesticides, organic solvents, surfactants and water in weight percent: 1%-30% of pesticides, 40% of organic solvents, 1-5% of surfactants, and 100% is supplemented with water.

[0015] Step 2: Add excess polyelectrolyte opposite to its surface charge polarity to solution A, centrifuge to remove excess polyelectrolyte and wash with deionized water.

[0016] Step 3: Repeat step 2 to make the oppositely charged polyelectrolyte adsorb on the surface of the pesticide particle to form a multilayer film, thereby preparing a microcapsule with colloidal particles as the capsule core and polyelectrolyte multilayer film as the capsule wall.

Embodiment 1

[0017] Embodiment 1: (1) the abamectin of 10g, the acetone of 40g, add the carboxylate of 2g and the water low-speed stirring of 38g and mix for 10 minutes, obtain pesticide suspension A; (2) add 30g cationic polymer in A Acrylamide was mixed and stirred for 30 minutes, the polyelectrolyte was removed by centrifugation and washed with deionized water; (3) (2) was repeated three times to obtain abamectin microcapsules.

Embodiment 2

[0018] Embodiment 2: (1) the lime sulfur of 10g, the acetone of 40g, add the carboxylate of 2g and the water of 38g and mix at low speed for 10 minutes, obtain pesticide suspension A; (2) add 30g cationic polypropylene in A The amides were mixed and stirred for 30 minutes, the polyelectrolyte was removed by centrifugation and washed with deionized water; (3) (2) was repeated three times to obtain lime sulfur microcapsules.

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Abstract

The invention relates to pesticide preparations and relates to water-soluble pesticide suspension concentrate of microcapsule type, in particular to pesticide microcapsules containing any one of abamectin, lime sulphur, triadimefon, streptomycin prochloraz, carbendazim, chlorothalonil, kresoxim-methyl, thiophanate methyl, astromicin, antimycoin, hymexazol, metalaxyl, myclobutanil, moroxydine hydrochloride, dioctyl divinyltriamino glycine acetate, pyrimethanil, myclobutanil, glyphosate, paraquat, acetochlor, imidacloprid, acetamiprid, pymetrozine, thiamethoxam and pyridaben. Each pesticide microcapsule comprises a wall and a core; the core is made of effective ingredients and solvent; the wall is made of polyester material of polyelectrolyte. The pesticide microcapsules have the advantages that application cost is lowered and less pesticide is applied.

Description

technical field [0001] The invention belongs to the field of pesticide preparation production, and in particular relates to a pesticide microcapsule prepared by a layer-by-layer self-assembly method. 【Background technique】 [0002] Microcapsule suspension pesticide refers to a pesticide dosage form that uses natural or synthetic polymer materials to form a tiny container with a core-shell structure, encapsulates the pesticide, and suspends it in water. It includes two parts, the capsule wall and the capsule core. The capsule core is the active ingredient and solvent of the pesticide, and the capsule wall is the film-forming polymer material. This dosage form is divided into a continuous phase and a discontinuous phase, the continuous phase is water and additives, and the discontinuous phase is coated pesticide microcapsules. [0003] Layer-by-layer self-assembly technology has been widely used in the preparation of pharmaceutical microcapsules. Due to its relatively high te...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A01N25/28A01N25/04A01N43/90A01N59/06A01N43/653A01N43/16A01N43/707A01N47/44A01N43/58B01J13/02
Inventor 陈美玲梁萍萍
Owner JIANGNAN UNIV
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