Preparation method of high-strength nanocellulose/alginic acid composite hydrogel

A nanocellulose and composite hydrogel technology, applied in the field of polymer functional materials, can solve the problems of poor mechanical properties of sodium alginate hydrogel, difficult to meet practical application requirements, low stiffness and strength, etc., and achieve environmental friendliness. performance, excellent enhancement effects, wide-ranging effects

Active Publication Date: 2021-08-10
WUHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, compared with polymers, the mechanical properties of sodium alginate hydrogel are poor, mainly reflected in its low stiffness and strength, and it is easy to break under the action of external force, which is difficult to meet the requirements of practical applications and limits its application. the breadth of

Method used

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  • Preparation method of high-strength nanocellulose/alginic acid composite hydrogel
  • Preparation method of high-strength nanocellulose/alginic acid composite hydrogel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] (1) hydrochloric acid is hydrolyzed to obtain sea sheath nanocrystals. The specific process is: 200 ml of water to 100 ml of concentrated hydrochloric acid (12 m), resulting in a 300 mL of 4M hydrochloric acid solution, poured into a three flask, heat the oil bath heating to 100 ° C, with a condensation reflow device and a stirring paddle, 7.5g sea sheel Cellulose (dry weight) is added to the three flask, and the reaction is stirred at 300 rpm for 4 h. After the reaction, the reaction after the reaction is diluted to 2L, stand overnight, after the settlement, remove the supernatant, leave a clean liquid , Centrifuge 7000 rpm of the underwater liquid is 15 min, pour it off, and the precipitate in the centrifugal tube is stirred well, then centrifuge again at 7000 rpm for 15 min, pour it off the supernatant, and put the incision liquid into the dialysis bag (interception molecular weight In the 8000-14000), in ultrapure water, three days, centrifuge at 1500 rpm 10min, take th...

Embodiment 2

[0027] (1) hydrochloric acid is hydrolyzed to obtain sea sheath nanocrystals. The specific process is: 200 ml of water to 100 ml of concentrated hydrochloric acid (12 m), resulting in a 300 mL of 4M hydrochloric acid solution, poured into a three flask, heat the oil bath heating to 100 ° C, with a condensation reflow device and a stirring paddle, 7.5g sea sheel Cellulose (dry weight) is added to the three flask, and the reaction is stirred at 300 rpm for 4 h. After the reaction, the reaction after the reaction is diluted to 2L, stand overnight, after the settlement, remove the supernatant, leave a clean liquid , Centrifuge 7000 rpm of the underwater liquid is 15 min, pour it off, and the precipitate in the centrifugal tube is stirred well, then centrifuge again at 7000 rpm for 15 min, pour it off the supernatant, and put the incision liquid into the dialysis bag (interception molecular weight In the 8000-14000), in ultrapure water, three days, centrifuge at 1500 rpm 10min, take th...

Embodiment 3

[0033] (1) hydrochloric acid is hydrolyzed to obtain sea sheath nanocrystals. The specific process is: 200 ml of water to 100 ml of concentrated hydrochloric acid (12 m), resulting in a 300 mL of 4M hydrochloric acid solution, poured into a three flask, heat the oil bath heating to 100 ° C, with a condensation reflow device and a stirring paddle, 7.5g sea sheel Cellulose (dry weight) is added to the three flask, and the reaction is stirred at 300 rpm for 4 h. After the reaction, the reaction after the reaction is diluted to 2L, stand overnight, after the settlement, remove the supernatant, leave a clean liquid , Centrifuge 7000 rpm of the underwater liquid is 15 min, pour it off, and the precipitate in the centrifugal tube is stirred well, then centrifuge again at 7000 rpm for 15 min, pour it off the supernatant, and put the incision liquid into the dialysis bag (interception molecular weight In the 8000-14000), in ultrapure water, three days, centrifuge at 1500 rpm 10min, take th...

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Abstract

The invention discloses a preparation method of high-strength nanocellulose / alginic acid composite hydrogel, and belongs to the field of polymer functional materials. The method comprises the following steps: adding sea squirt cellulose into an acid solution, and reacting to obtain sea squirt cellulose nanocrystals; adding an etherification reaction catalyst and a cationic etherifying agent into the sea squirt cellulose nanocrystal suspension, and carrying out cross-linking reaction to obtain positively charged sea squirt cellulose nanocrystals; preparing a solution containing positively charged sea squirt cellulose nanocrystals and sodium alginate, uniformly mixing, defoaming, forming a film by a tape casting method, and soaking the film in a calcium chloride solution with the concentration of less than 0.1 M to obtain preformed hydrogel; and stretching the preformed hydrogel, and soaking the stretched preformed hydrogel in a calcium chloride aqueous solution with the concentration of more than 0.5 M for fixation to obtain the high-strength nanocellulose / alginic acid composite hydrogel. The preparation process is simple, the raw materials are wide in source and low in cost, and the obtained composite hydrogel is excellent in mechanical property.

Description

Technical field [0001] The present invention belongs to the field of polymer functional materials, and more particularly to a method of preparing high strength nancellulose / alginate composite hydrogel. Background technique [0002] Hydrogel, a polymeric material having a three-dimensional network structure, similar to the soft tissue of the biological body, has the advantage of high water content and good flexibility, and is a desired candidate material for regeneration medicine and histology. Synthesis of hydrogels mainly have two major categories of natural polymer and synthetic polymer. Natural high molecules have the advantages of good biocompatibility, good degradability, rich resources, etc., which have extensive application value in the fields of chemical, food, environmental protection and biomedicine. [0003] Algic acid is a natural polymer polysaccharide, which is the main ingredient of algae cell wall and cellular. In addition to high biocompatibility, alginate hydr...

Claims

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Application Information

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IPC IPC(8): C08J3/075C08L1/28C08L5/04C08K3/16
CPCC08J3/075C08J2305/04C08J2401/28C08K2003/162
Inventor 常春雨薛晓凡
Owner WUHAN UNIV
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