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Attapulgite-chitosan composite gel and preparation method thereof

A composite gel and composite hydrogel technology, applied in the field of clay deep processing, can solve the problems of application limitation, poor mechanical properties of chitosan physical gel, etc., and achieve the effects of reduced preparation cost, safe and environmentally friendly process, and good mechanical properties.

Active Publication Date: 2020-05-22
HUAIYIN INSTITUTE OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the mechanical properties of chitosan physical gel are extremely poor, which limits its application in many fields.
There are reports in the literature on the use of nano-bentonite or carbon nanofibers to improve mechanical properties, but the reported composite gels are all based on chitosan, and the addition range of inorganic materials is ≤50wt%.

Method used

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  • Attapulgite-chitosan composite gel and preparation method thereof
  • Attapulgite-chitosan composite gel and preparation method thereof
  • Attapulgite-chitosan composite gel and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0022] This embodiment improves a chitosan-attapulgite composite gel, which is composed of components in the following mass ratio: attapulgite: chitosan: glutaraldehyde: borax=100:12:1.44:3.

[0023] Crush the attapulgite to 200 mesh, acidify it with 2wt% acetic acid for 6 hours, discard the non-clay impurities in the lower layer by centrifugal sedimentation, then reconfigure the slurry into a 2wt% attapulgite slurry, and adjust the pH of the attapulgite slurry to about 4 , and then add an appropriate amount of 4wt% chitosan solution (wherein the mass ratio of the attapulgite in the attapulgite slurry to the chitosan in the chitosan solution is 1:0.12), and stir evenly, continue to add an appropriate amount of 5wt% Glutaraldehyde solution stirred 30min (wherein, the glutaraldehyde consumption in glutaraldehyde solution is 12% of chitosan quality in chitosan solution), continues to add 0.4mol / L borax solution and stirs (wherein, borax consumption is ⩽ 3% of the mass of the atta...

Embodiment approach 2

[0026] This embodiment improves a chitosan-attapulgite composite gel, which is composed of components in the following mass ratio: attapulgite: chitosan: glutaraldehyde: borax=100:25:2.5:4.

[0027] The attapulgite was crushed to 200 mesh, acidified with 2wt% acetic acid for 6h, and the non-clay impurities in the lower layer were discarded by centrifugal sedimentation, and then the slurry was reconfigured into a 3.5wt% attapulgite slurry, and the pH of the attapulgite slurry was adjusted to 4 Then add an appropriate amount of 4wt% chitosan solution (wherein the mass ratio of the attapulgite in the attapulgite slurry to the chitosan in the chitosan solution is 1:0.25) and stir evenly, continue to add an appropriate amount of 5wt% Glutaraldehyde solution stirred 30min (wherein, the glutaraldehyde consumption in glutaraldehyde solution is 10% of chitosan quality in chitosan solution), continues to add 0.4mol / L borax solution and stirs (wherein, borax consumption is ⩽ 4% of the at...

Embodiment approach 3

[0030] This embodiment improves a chitosan-attapulgite composite gel, which is composed of components in the following mass ratio: attapulgite: chitosan: glutaraldehyde: borax=100:30:4.5:5.

[0031] Crush the attapulgite to 200 mesh, acidify it with 2wt% acetic acid for 6 hours, discard the non-clay impurities in the lower layer by centrifugal sedimentation, then reconfigure the slurry into a 4wt% attapulgite slurry, and adjust the pH of the attapulgite slurry to about 4 , and then add an appropriate amount of 4wt% chitosan solution (the mass ratio of the attapulgite in the attapulgite slurry to the chitosan in the chitosan solution is 1:0.3), stir evenly, and continue to add an appropriate amount of 5wt% Glutaraldehyde solution stirred 30min (wherein, the glutaraldehyde consumption in glutaraldehyde solution is 15% of chitosan quality in chitosan solution), continues to add 0.4mol / L borax solution and stirs (wherein, borax consumption is ⩽ 5% of the mass of the attapulgite in...

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Abstract

The invention relates to the field of deep processing of clay, and discloses an attapulgite-chitosan composite gel and a preparation method thereof. The composite gel comprises the following components according to a mass ratio of attapulgite, chitosan, glutaraldehyde and borax is 100:(12-35): (1.2-5.25):(3-5). Attapulgite-based composite hydrogel is prepared by a sol-gel method by using the attapulgite as a main material, the chitosan as an auxiliary material and the glutaraldehyde and the borax as double crosslinking agents. The composite hydrogel has an excellent three-dimensional pore structure and excellent mechanical properties, has good adsorption, slow-release performance and immobilization ability, and can be used as medical functional materials such as a mask, a medicinal dressing or a tissue engineering scaffold, and can be further lyophilized into an aerogel with more wide application. The aerogel obtained by a preparation technology has excellent mechanical properties, andhas the elastic modulus which can be adjusted within the range of 15-193MPa. The technology is simple, the preparation cycle is short, and requirements of large-scale production are met.

Description

technical field [0001] The invention relates to the field of clay deep processing, in particular to a chitosan-attapulgite composite gel and a preparation method thereof. Background technique [0002] Chitosan-based gel materials have excellent biocompatibility, biodegradability, non-toxicity, bacteriostasis and biological activity, and are used in many fields such as medicine, food, chemical industry, cosmetics, water treatment, biochemistry and biomedical engineering. The future is bright. Polysaccharides have been included in the national food additive use standard GB-2760. In recent years, studies have found that chitosan is positively charged in a body fluid environment, while the human mucous membrane is negatively charged. Chitosan-based tissue engineering scaffold materials or wound dressings can have good biocompatibility with human mucosa, thereby promoting tissue regeneration and wound healing. However, the mechanical properties of chitosan physical gel are ext...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J13/00
CPCB01J13/0091
Inventor 马静蕊金慧然陈静奚煜锋朱永周鑫宇胡涛金叶玲丁师杰谭立强
Owner HUAIYIN INSTITUTE OF TECHNOLOGY
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