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Chemical and physical double-cross-linking high-strength chitin gel material and preparation method thereof

A double cross-linking and chemical cross-linking technology, used in the fields of polymer materials and biomedical materials, can solve problems such as insufficient mechanical properties, and achieve the effects of excellent mechanical properties, excellent product performance and low cost.

Active Publication Date: 2015-03-04
WUHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to overcome the deficiencies in the mechanical properties of existing chitin hydrogels, and provide a high-strength chitin gel-based material based on chemical and physical double cross-linking and its preparation method

Method used

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  • Chemical and physical double-cross-linking high-strength chitin gel material and preparation method thereof
  • Chemical and physical double-cross-linking high-strength chitin gel material and preparation method thereof
  • Chemical and physical double-cross-linking high-strength chitin gel material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Soak commercially available chitin with 0.1 mol / L dilute HCl at room temperature for 12 h, filter distilled water and wash with 0.1 mol / L NaOH aqueous solution for 12 h, then filter distilled water and wash with 0.3 wt% NaClO 2 Depigmentation and purification, drying to obtain chitin powder with an acetylation degree of 98%. A solvent containing 10-50 wt% KOH and the rest of water was prepared, chitin powder was added, stirred and then frozen overnight below freezing point, and a chitin solution with a concentration of 5 wt% was obtained after thawing. at 5 o Under C, add epichlorohydrin according to the molar ratio of cross-linking agent to chitin at 0.1:1, stir evenly, place in the mold for 24 hours to obtain a partially chemically cross-linked chitin gel, and then place the gel in distilled water The physical cross-linking was continued for 24 hours, and finally washed to neutral to obtain a transparent double-cross-linked chitin hydrogel. The double-crosslinked ch...

Embodiment 2

[0038] 2 ~ 30 wt% KOH, 0 ~ 10 wt% LiOH, 0 ~ 20 wt% urea and the remaining water are prepared as a solvent, and the chitin powder obtained in Example 1 is added, stirred and placed below freezing point to freeze overnight, After thawing, a chitin solution with a concentration of 6 wt% was obtained. at 5 o C, add epichlorohydrin according to the molar ratio of cross-linking agent and chitin at 1:1, stir evenly, place in the mold for 24 hours to obtain a partially chemically cross-linked chitin gel, and then place the gel in ethanol The physical cross-linking was continued for 12 hours, and finally washed to neutrality to obtain a transparent double-cross-linked chitin hydrogel. The double-crosslinked chitin hydrogel can be stretched, bent, folded, and twisted without breaking, and has very good toughness, with a compressive strength of 1.2 MPa.

Embodiment 3

[0040] 2 ~ 30 wt% KOH, 0 ~ 20 wt% NaOH, 0 ~ 20 wt% urea and the remaining water are prepared as a solvent, and the chitin powder obtained in Example 1 is added, stirred and placed below freezing point to freeze overnight, After thawing, a chitin solution with a concentration of 4 wt% was obtained. at 5 o C, add epichlorohydrin according to the molar ratio of cross-linking agent and chitin at 3:1, stir evenly, place in the mold for 24 hours to obtain a partially chemically cross-linked chitin gel, and then place the gel at 80 The physical cross-linking was continued for 12 h in wt% ethanol aqueous solution, and finally washed with water until neutral to obtain a transparent double-cross-linked chitin hydrogel. The double-crosslinked chitin hydrogel can be stretched, bent, folded, and twisted without breaking, and has very good toughness, with a compressive strength of 0.1 MPa.

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Abstract

The invention discloses a chemical and physical double-cross-linking high-strength chitin gel material and a preparation method thereof. The preparation method comprises the following steps: adding a cross-linking agent for partial chemical cross-linking at the gelatinization temperature lower than that of a chitin solution, subsequently soaking the chitin gel which is subjected to partial chemical cross-linking into a non-solvent for physical cross-linking, and washing with water, thereby obtaining double-cross-linking chitin hydrogel; replacing water in the double-cross-linking chitin hydrogel by an organic liquid, thereby obtaining chitin organic gel, and drying the double-cross-linking chitin hydrogel or the organic gel, thereby obtaining double-cross-linking chitin aerogel; and hot-rolling the double-cross-linking chitin hydrogel or the double-cross-linking chitin aerogel, thereby preparing double-cross-linking chitin biological plastic. The double-cross-linking chitin gel material disclosed by the invention is excellent in mechanical property, low density and high specific surface area, can be easily processed into finished products such as fiber, sheets, granules, films and columns, and is applicable to large-scale popularization and application.

Description

[0001] Technical field [0002] The present invention involves a type of chito material, which specializes in a high -intensity and physical dual cross -linking high -intensity chitin gel system and its preparation methods based on chemical and physical. It belongs to the field of high molecular materials and biomedical materials. Background technique [0003] High molecular hydrogel is a three -dimensional space network composed of hydrophilic substances. Its physical and chemical characteristics are close to biological living tissue and have a wide range of application prospects in biomedical and organizational engineering.For example, polymer hydrogels with functions such as optical (CN102336995A), magnetic (CN102391603A), and temperature sensitivity (CN102690401A).However, due to the high moisture content and pore rate of hydrogel, the number of polymer chains on the cross -sectional area of the unit is small, resulting in a low mechanical properties, and the application rang...

Claims

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Application Information

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IPC IPC(8): C08J3/075C08J3/24C08J9/28C08L5/08
Inventor 蔡杰丁贝贝黄俊超许多铎张俐娜
Owner WUHAN UNIV
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