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Preparation method of high-strength gamma-polyglutamic acid hydrogel

A polyglutamic acid and hydrogel technology, applied in the field of hydrogels, can solve the problems of complex preparation process and lack of versatility in the method, achieve uniform and stable crosslinking density, good mechanical properties, and avoid local stress concentration Effect

Active Publication Date: 2015-12-30
TIANJIN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Topological structure gel is a hydrogel with 8-shaped cross-linking points, but its preparation process is complicated, and the method is not universal. The topological hydrogels reported so far mainly focus on the PEG-α-CD system

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Weigh 2.4g of γ-polyglutamic acid, add 17.6g of water, stir well, add 1.2g of lithium, stir evenly, add 1.44g of ethylene glycol diglycidyl ether cross-linking agent, fully stir to dissolve and adjust the pH to 4 , Constant temperature reaction at 50°C for 24h. Take out the hydrogel and refer to GB / T1040-92 to measure the compressive strength of 620.6MPa, the tensile strength of 1.83MPa, the tensile elongation at break of 170%, and the saline absorption ratio measured after swelling in normal saline is 39.9 times .

Embodiment 2

[0015] Weigh 1.6g of γ-polyglutamic acid, add 18.4g of water, stir well, add 0.32g of lithium, stir evenly, add 0.64g of ethylene glycol diglycidyl ether cross-linking agent, fully stir to dissolve and adjust the pH to 4 , Constant temperature reaction at 50°C for 24h. Take out the hydrogel and refer to GB / T1040-92 to measure the compressive strength of 291.7MPa, the tensile strength of 0.51MPa, the tensile elongation at break of 100%, and the saline absorption ratio measured after swelling in normal saline is 42.5 times .

Embodiment 3

[0017] Weigh 6.4g of γ-polyglutamic acid, add 33.6g of water, stir well, add 0.64g of lithium, stir evenly, add 3.2g of ethylene glycol diglycidyl ether cross-linking agent, fully stir to dissolve and adjust the pH to 4 , Constant temperature reaction at 50°C for 24h. Take out the hydrogel and refer to GB / T1040-92 to measure the compressive strength of 66.4MPa, the tensile strength of 0.4MPa, the tensile elongation at break of 80%, and the saline absorption ratio measured after swelling in normal saline is 39.2 times .

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Abstract

The invention relates to a preparation method of high-strength gamma-polyglutamic acid hydrogel. The hydrogel contains gamma-polyglutamic acid, laponite and water. The preparation method includes the following steps of dissolving 8-20% of gamma-polyglutamic acid in distilled water to obtain a first reaction solution, adding laponite according to different proportions of the gamma-polyglutamic acid and the laponite to obtain a second reaction solution, adding a cross-linking agent into the second reaction solution, performing even stirring, regulating the pH of a system, and performing reaction at the temperature of 50 DEG C for 24 hours. The high-strength gamma-polyglutamic acid hydrogel prepared by means of the preparation method has higher mechanical strength, has better adsorption property to saline water, is applicable to the environment needing higher mechanical strength and has potential application value in the fields of materials, spinning and the like.

Description

technical field [0001] The invention belongs to the field of hydrogels, in particular to a high-strength gamma-polyglutamic acid hydrogel and a preparation method thereof. Background technique [0002] γ-polyglutamic acid is an extracellular biopolymer amino acid polymer synthesized by microorganisms. It can form a super absorbent gel with a three-dimensional network structure through chemical crosslinking agents, γ-ray irradiation or other methods. Water absorption, hygroscopicity and water retention, etc., can absorb hundreds to thousands of times of its own mass of water, expand after absorbing water, and will not lose water after pressurization. It also has renewable and biodegradable properties. A water-retaining material that is friendly to the natural environment. It can be used in agriculture, food, cosmetics, hygiene products, biomedicine and other fields. [0003] However, it is generally found in use that γ-polyglutamic acid hydrogel becomes weak after absorbing...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J3/075C08J3/24C08L77/04C08K3/34
CPCC08J3/075C08J3/24C08J2377/04C08K3/34C08L77/04
Inventor 李政华嘉川王静心张健飞巩继贤
Owner TIANJIN POLYTECHNIC UNIV
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