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Preparation method for SiO2 nanoparticle reinforced chitosan composite microcapsule

A technology of compounding microcapsules and nanoparticles, which is applied in the directions of microcapsule preparation and microsphere preparation to achieve the effects of microscopically controllable process, dense capsule wall and environmental protection of raw materials

Inactive Publication Date: 2016-10-26
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there is no report on the introduction of inorganic nanoparticles into the chitosan microcapsule system

Method used

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  • Preparation method for SiO2 nanoparticle reinforced chitosan composite microcapsule
  • Preparation method for SiO2 nanoparticle reinforced chitosan composite microcapsule
  • Preparation method for SiO2 nanoparticle reinforced chitosan composite microcapsule

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Accurately weigh 0.40g of medium-viscosity (viscosity 200-400mPa.s) chitosan, add it to 20mL of 0.2mol / L acetic acid solution, stir at a constant speed at room temperature for 1h to fully dissolve the chitosan, and then let it stand for 1h , eliminate the air bubbles in the chitosan solution, and finally obtain a chitosan solution with a mass concentration of 2%.

[0036] Measure 10ml of silica sol, use a micro syringe to slowly add a total of 0.6ml of 2mol / L hydrochloric acid six times to adjust the pH of the silica sol, and slowly stir the solution at room temperature during the dropping process to obtain a pretreated pH of 2.2-2.7 of silica sol solution.

[0037] Take the prepared chitosan acetic acid solution 10mL, slowly add 1.5mL pretreated silica sol solution under stirring at room temperature. The mixed system was stirred at room temperature for 30 minutes, then placed in an ultrasonic device for ultrasonic treatment for 30 minutes to allow the system to mix ev...

Embodiment 2

[0040] Change chitosan viscosity (viscosity is 20-100mPa.s) to low viscosity chitosan.

[0041] Accurately weigh 0.40g of low-viscosity (viscosity 20-100mPa.s) chitosan, add it to 20mL of 0.2mol / L acetic acid solution, stir at a constant speed at room temperature for 1h to fully dissolve the chitosan, and then let it stand for 1h , eliminate the air bubbles in the chitosan solution, and finally obtain a chitosan solution with a mass concentration of 2%.

[0042] Measure 10ml of silica sol, use a micro syringe to slowly add a total of 0.6ml of 2mol / L hydrochloric acid six times to adjust the pH of the silica sol, and slowly stir the solution at room temperature during the dropping process to obtain a pretreated pH of 2.2-2.7 of silica sol solution.

[0043] Take the prepared chitosan acetic acid solution 10mL, slowly add 1.5mL pretreated silica sol solution under stirring at room temperature. The mixed system was stirred at room temperature for 30 minutes, then placed in an u...

Embodiment 3

[0046] Change chitosan viscosity (viscosity is 1000-1400mPa.s) to high viscosity chitosan.

[0047] Accurately weigh 0.40g of high-viscosity (viscosity 1000-1400mPa.s) chitosan, add it to 20mL of 0.2mol / L acetic acid solution, stir at a constant speed at room temperature for 1h to fully dissolve the chitosan, and then let it stand for 1h , eliminate the air bubbles in the chitosan solution, and finally obtain a chitosan solution with a mass concentration of 2%.

[0048] Measure 10ml of silica sol, use a micro syringe to slowly add a total of 0.6ml of 2mol / L hydrochloric acid six times to adjust the pH of the silica sol, and slowly stir the solution at room temperature during the dropping process to obtain a pretreated pH of 2.2-2.7 of silica sol solution.

[0049] Take the prepared chitosan acetic acid solution 10mL, slowly add 1.5mL pretreated silica sol solution under stirring at room temperature. The mixed system was stirred at room temperature for 30 minutes, then placed...

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Abstract

The invention discloses a preparation method for a SiO2 nanoparticle reinforced chitosan composite microcapsule. The preparation method is as follows: by utilizing a gas-liquid microfluidic device, and through mixing of an acidic silica sol with a liquid-phase solution, SiO2 nanoparticles are dispersed in a chitosan solution; by utilizing hydrogen-bond interaction generated by active groups in chitosan molecules and the SiO2 nanoparticles, the nanoparticles are introduced into the capsule wall of the chitosan microcapsule; meanwhile, the chitosan used as a cationic electrolyte forms cationic and anionic complex compounds with a sodium dodecyl sulfate anionic electrolyte by mutual attraction through charges, so solubility of the chitosan in a solution is reduced; and the chitosan coats a capsule core substance to form a composite microcapsule, so a chitosan / nanometer SiO2 composite microcapsule is obtained. The prepared composite microcapsule provided by the invention has the following advantages: the nanoparticles are introduced onto the capsule wall of the microcapsule, so compactness of the capsule wall of the microcapsule is increased; the mechanical performance of the microcapsule is reinforced; the capsule wall of the chitosan composite microcapsule is insusceptible to cracking under stress; and application range and fields of the chitosan microcapsule are expanded.

Description

technical field [0001] The present invention relates to SiO 2 Nanoparticles, specifically relate to a microcapsule with polymer chitosan and anion electrolyte sodium dodecyl sulfate as the microcapsule wall, and make SiO by mixing acidic silica sol in liquid phase solution 2 The nanoparticles are dispersed into the chitosan solution, and the active groups (amino groups, hydroxyl groups) in the chitosan molecule are used to interact with the nanoparticles SiO 2 The generated hydrogen bond action introduces the nanoparticles into the capsule wall of the chitosan microcapsules. At the same time, chitosan acts as a cationic electrolyte and sodium lauryl sulfate anion electrolyte to attract each other to form a complex of positive and negative ions through charge, so that Its solubility in the solution is reduced and the capsule core is wrapped to form chitosan / nano-SiO 2 Composite microcapsules. Background technique [0002] As the only alkaline polysaccharide containing cati...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J13/14
CPCB01J13/14
Inventor 李曦丁妮陈艳军张超灿
Owner WUHAN UNIV OF TECH
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