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Method for preparing microcapsule

A technology of microcapsules and inorganic particles, applied in the chemical industry, can solve the problems of environmental pollution and increase the manufacturing cost of microcapsules, and achieve the effects of reducing cost, reducing pollution and simple process

Inactive Publication Date: 2010-08-25
XIAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The use of surfactants, on the one hand, increases the manufacturing cost of microcapsules, and on the other hand, may cause certain pollution to the environment during or after the use of microcapsules

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] Mix 2mL of chloroform and 0.02g of tetraethyl silicate evenly, dissolve in 0.022g of abamectin, then mix with 0.2g of titanium dioxide particles and 97.7mL of water, stir at room temperature for 2min, then heat to 50°C, continue to The reaction was stirred for 200 min and cooled to room temperature. The precipitate was separated by centrifugation and washed three times with deionized water to obtain the avermectin microcapsules.

Embodiment 2

[0014] Mix 2mL of olive oil and 0.02g of tetrabutyl titanate evenly, dissolve in 0.2g of vitamin E, then mix with 1g of silicon dioxide particles and 1.8mL of water, and stir and react at room temperature for 300min. The precipitate was separated by centrifugation and washed three times with deionized water to obtain vitamin E microcapsules.

Embodiment 3

[0016] Dissolve 0.5g of capsaicin in 2mL of tetraethyl silicate, then mix with 0.01g of silicon dioxide particles, 0.01g of titanium dioxide particles and 7.5mL of water, adjust the continuous phase to pH 2 with hydrochloric acid, and continue stirring React for 5 hours. The precipitate was separated by centrifugation and washed three times with deionized water to obtain capsaicin microcapsules.

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PUM

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Abstract

The invention discloses a method for preparing a microcapsule. The method comprises the following steps of: mixing and dispersing inorganic particles serving as stabilizing agents, aqueous solution and oil phase containing active ingredients to prepare water-in-oil type emulsion; or mixing and dispersing the inorganic particles serving as the stabilizing agents, the oil phase containing the active ingredients and water to prepare the water-in-oil type emulsion; performing the hydrolysis reaction on silicate ester and / or titanate on the oil-water interface under the stirring condition, forming membranoid substances by combining the hydrolysis product with the inorganic particles distributed on the oil-water interface, and packing emulsion droplets containing the active ingredients; and then removing the continuous phase through filtering, centrifuging or distilling, and washing to obtain the microcapsule, wherein the oil phase is the silicate ester, the titanate, silicate ester and titanate or an organic solvent containing the silicate ester or / and the titanate. In the method for preparing the microcapsule, the solid particles are replaced by surfactants, so that the method reduces the pollution of pesticide water emulsion products to the environment, and also reduces the production cost of the pesticide water emulsion simultaneously.

Description

technical field [0001] The invention belongs to the technical field of chemical industry, and in particular relates to a preparation method of microcapsules. Background technique [0002] Microcapsule technology is a technology that uses natural or synthetic film-forming materials to coat dispersed solids, liquids or gases to form tiny particles. There are many methods for preparing microcapsules, including interfacial polymerization, orifice-coagulation bath method, emulsion polymerization, in-situ polymerization, spray method, air suspension method, complex coacervation method, etc. Among them, interfacial polymerization and emulsion polymerization are important chemical methods commonly used to prepare microcapsules. However, when preparing microcapsules by these two methods, in order to form a relatively stable interface or emulsion, it is often necessary to use a surfactant. The use of surfactants, on the one hand, increases the manufacturing cost of the microcapsules...

Claims

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Application Information

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IPC IPC(8): B01J13/06
Inventor 贺拥军
Owner XIAN UNIV OF SCI & TECH
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