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A kind of silica core-shell coated liquid microcapsule and preparation method thereof

A technology of silica and microcapsules, which is applied in the preparation of microcapsule preparations and microspheres, etc., can solve the problems of difficulty in obtaining microcapsules with uniform size and inability to effectively form micro-nano core material droplets, etc. , low equipment requirements, good light transmittance effect

Active Publication Date: 2015-12-09
INST OF CHEM MATERIAL CHINA ACADEMY OF ENG PHYSICS +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since amphiphilic liquids can be dissolved in both water and low-polarity organic solvents, it is impossible to effectively form micro-nano core material droplets that are conducive to shell structure coating; and amphiphilic liquids (such as tetrahydrofuran, acetone, acetonitrile, etc.) Tends to have good solvency for organic and polymeric materials, making it difficult to microencapsulate by established methods
In addition, it is difficult to obtain microcapsules with highly uniform size by coating liquid with common methods

Method used

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Examples

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Comparison scheme
Effect test

preparation example Construction

[0025] A preparation method of a silicon dioxide core-shell coated liquid microcapsule, comprising the following steps:

[0026] Step 1: Select polymer monomer A to prepare polymer microspheres B with uniform particle size and positive charge on the surface. The specific operation is as follows: dissolve the surfactant in water to obtain a 0.1-20Wt% surfactant solution, and then add A polymer monomer soluble in azobisisobutylamidine hydrochloride (AIBA, V50), the amount of AIBA added is 5% to 50% of the mass of the polymer monomer, and the function of AIBA is an initiator to trigger the polymer monomer Bulk polymerization; Ultrasonic dispersion 5 ~ 15min. After uniform dispersion, first pass nitrogen gas for 15 minutes to 2 hours to replace the air in the system, then raise the temperature to 60-80°C, set the stirring rate at 100-800r / min, and react under nitrogen protection for 24 hours. The prepared microspheres are centrifuged with alcohol for 3 to 5 times, unreacted polym...

Embodiment 1

[0036] Take 100ml of pure water, add 10g of rectified styrene, 1.5g of PVP and 0.26g of AIBA into a 250mL three-necked flask equipped with a stirrer, thermometer and condenser, stir for 1h under nitrogen protection, and set the stirring rate at 450r / min, then slowly raise the temperature to 70°C, continue the reaction for 12h, lower the temperature to room temperature, stop stirring, remove the nitrogen, centrifuge the product and wash it fully with ethanol to obtain a sample, freeze-dry, and obtain a particle size of 240nm. Molecular microspheres, and the dispersion coefficient is less than 5%.

[0037] Ultrasonic disperse 5g of PVP into ethanol solution, then mix the ethanol solution of PVP with 120ml of the above microsphere suspension (6.6wt%), and keep stirring at room temperature for 24 hours to ensure that PVP is fully adsorbed to the surface of polystyrene microspheres. Finally, the reaction liquid is centrifuged, and the supernatant is removed to remove unadsorbed PV...

Embodiment 2

[0043] Take 100ml of pure water, add 10g of rectified styrene, 1.5g of PVP and 0.20g of AIBA into a 250mL three-necked flask equipped with a stirrer, thermometer and condenser, stir for 1h under nitrogen protection, and set the stirring rate at 450r / min, then slowly raise the temperature to 70°C, continue the reaction for 12h, lower the temperature to room temperature, stop stirring, remove the nitrogen, centrifuge the product and wash it fully with ethanol to obtain a sample, freeze-dry, and obtain a particle size of 490nm. Molecular microspheres, and the dispersion coefficient is less than 5%.

[0044] Ultrasonic disperse 5g of PVP into ethanol solution, then mix the ethanol solution of PVP with 120ml of the above microsphere suspension (7.2wt%), and keep stirring at room temperature for 24 hours to ensure that PVP is fully adsorbed to the surface of polystyrene microspheres. Finally, the reaction solution was centrifuged, and the supernatant was removed to remove unadsorbe...

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Abstract

The invention discloses a microcapsule with a silicon dioxide core-shell coating liquid and a preparation method of the microcapsule. The preparation method comprises the following steps of: selecting a polymer monomer A to prepare a polymer microsphere B with uniform grain size and having positive charge on the surface; absorbing a surface active agent onto the surface of the microsphere B to obtain a seed microsphere C; coating the seed microsphere C with tetraethoxysilane to obtain a microsphere D with porous silicon dioxide as a shell; calcining the microsphere D to obtain a hollow silicon dioxide microsphere E; soaking the hollow silicon dioxide microsphere E into liquid of a core material to obtain a microsphere F with the core material; coating the microsphere F with tetraethoxysilane to obtain the core-shell structured microcapsule G with dense silicon dioxide as the shell. The method is applicable to the preparation of the microcapsule coating low-polarity liquid, high-polarity liquid and dual-polarity liquid, solves the problem in the prior art that the dual-polarity liquid cannot be coated into the microcapsule, is simple in operation steps, and low in requirement for equipment, and the microcapsule is high in heat stability, good in corrosion resistance and uniformity of grain size.

Description

technical field [0001] The invention belongs to the field of material preparation, in particular to a silicon dioxide core-shell coated liquid microcapsule and a preparation method thereof, in particular to a silicon dioxide core-shell coated amphiphilic liquid microcapsule and a preparation method thereof. Background technique [0002] Microcapsule preparation technology is a technology that embeds solid, liquid or gas in tiny and sealed capsules. It has broad application prospects in medicine, pesticide, food, paint and other industries, and is one of the high-tech developments in this century. one. The cladding shell is called the wall material, and the encapsulated capsule core is called the core material. Microcapsule technology can effectively prevent the core material from being damaged by external environmental factors such as pH value, oxygen, humidity, heat, and light; it can reduce the diffusion or evaporation of the core material to the environment; it can effec...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J13/02
Inventor 冯娇边莎戴晓军艾文涛蔡华强黄辉
Owner INST OF CHEM MATERIAL CHINA ACADEMY OF ENG PHYSICS
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