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A kind of cationic guar gum/chitosan composite hydrogel and preparation method thereof

A technology of cationic guar gum and composite hydrogel, which is applied in the field of polymer materials, can solve the problems of dissociation and exudation of cross-linking agents, practical application limitations, single function of hydrogel, etc., and achieve good adhesion effect

Active Publication Date: 2021-06-22
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The preparation methods of existing hydrogels are often complicated and require the use of chemical cross-linking agents. During use, the cross-linking agents may dissociate and leak out, which will affect their application.
In addition, the functions of existing hydrogels are often relatively single, which has certain restrictions on their practical applications.

Method used

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  • A kind of cationic guar gum/chitosan composite hydrogel and preparation method thereof
  • A kind of cationic guar gum/chitosan composite hydrogel and preparation method thereof
  • A kind of cationic guar gum/chitosan composite hydrogel and preparation method thereof

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preparation example Construction

[0030] The invention discloses a preparation method of a multifunctional whole biomass cationic guar gum / chitosan composite hydrogel, wherein the biomass material is derived from nature, has a wide range of sources, and has the characteristics of regeneration and degradability. Important raw materials in the field of materials, such as guar gum and chitosan, etc., have a large number of hydrophilic groups such as hydroxyl and amino groups, and are ideal raw materials for the preparation of hydrogels; cationic guar gum, that is, guar gum hydroxypropyl tri Methylammonium chloride, abbreviated as CGG, is a common derivative of guar gum, and cationic guar gum-based hydrogels have great application potential in drug delivery, biosensors, and sewage treatment; chitosan , that is, polyglucosamine (1-4)-2-amino-β-D glucose, abbreviated as CS, also known as deacetylated chitin, is obtained by deacetylating chitin widely existing in nature; specifically includes the following steps,

[...

Embodiment 1

[0038] Step 1, the chitosan (CS) powder of 0.1g is added in the acetic acid aqueous solution of 0.1% (v / v) of 100ml, at room temperature mechanical stirring 6h makes it dissolve completely;

[0039] Step 2, the cationic guar gum (CGG) powder of 0.1g is dissolved in the chitosan solution, is stirred at room temperature 6h, prepares cationic guar gum / chitosan mixed solution;

[0040] Step 3, dissolve 0.01g of oxidizing agent and sodium periodate in 3ml of water, add it dropwise to the mixed solution of cationic guar gum / chitosan with a dropper, stir and react for 0.5h under dark conditions, then stop stirring , put it at room temperature, gel naturally after 0.5h, and form CGG / CS self-crosslinking composite hydrogel.

Embodiment 2

[0042] Step 1, the chitosan (CS) powder of 0.5g is added in the acetic acid aqueous solution of 10% (v / v) of 100ml, at room temperature mechanical stirring 24h makes it dissolve completely;

[0043] Step 2, the cationic guar gum (CGG) powder of 0.5g is dissolved in the chitosan solution, is stirred at room temperature 24h, prepares cationic guar gum / chitosan mixed solution;

[0044] Step 3, dissolve 0.1 g of oxidizing agent and sodium periodate in 3 ml of water, add dropwise to the mixed solution of cationic guar gum / chitosan with a dropper, stir and react for 24 hours under dark conditions, then stop stirring, It was placed at room temperature and gelled naturally after 24 hours, forming a CGG / CS self-crosslinking composite hydrogel.

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Abstract

A kind of cationic guar gum / chitosan composite hydrogel and preparation method thereof of the present invention, described method comprises the following steps, step 1, in acetic acid solution, add chitosan, cationic guar gum and sodium periodate , the mass ratio of chitosan, cationic guar gum and sodium periodate is (0.1-1): (0.1-1): (0.01-1), obtain mixed solution A; Step 2, under dark conditions, The mixed solution A was reacted at room temperature for 0.5-24h, and then the resulting reaction solution was placed at room temperature to obtain a cationic guar gum / chitosan composite hydrogel; the carbonyl group introduced in the chitosan and the hydroxyl group on the cationic guar gum molecule A condensation reaction occurs to form a cyclic acetal, while the carbonyl group introduced in the cationic guar gum and the amino group on the chitosan molecule form a Schiff base to achieve intermolecular cross-linking. It has potential in many fields such as wastewater treatment and biomedical engineering. application.

Description

technical field [0001] The invention relates to the technical field of polymer materials, in particular to a cationic guar gum / chitosan composite hydrogel and a preparation method thereof. Background technique [0002] Hydrogel is a soft material with a three-dimensional network structure formed by hydrophilic polymers through physical cross-linking or chemical cross-linking. Due to the characteristics of porous network structure and high water content, hydrogel has good adsorption and biocompatibility, which makes the research of hydrogel become a hot spot in recent years. [0003] The preparation methods of the existing hydrogels are often complicated and require the use of chemical cross-linking agents. During the use, the cross-linking agents may dissociate and seep out, which will affect their application. In addition, the functions of existing hydrogels are often relatively single, which has certain limitations for their practical applications. Contents of the inven...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L5/08C08L5/00C08J3/24C08J3/075C08B37/00C08B37/08
CPCC08B37/003C08B37/0096C08J3/075C08J3/246C08J2305/00C08J2305/08C08J2405/00C08J2405/08
Inventor 戴磊王岩王晓婉李紫秀段超赵伟熊传银
Owner SHAANXI UNIV OF SCI & TECH