Preparation method of chitosan gel with high water absorbability

A technology of high water absorption and chitosan, which is applied in the field of high water absorption gel materials, can solve the problems that have not been reported publicly, and achieve the effect of reducing diffusion resistance, mild reaction conditions, and large pore structure

Pending Publication Date: 2021-10-19
CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method has not been publicly reported at home and abroad

Method used

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  • Preparation method of chitosan gel with high water absorbability
  • Preparation method of chitosan gel with high water absorbability

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Add 2.0853g of chitosan to 100mL of 1% v / v hydrochloric acid aqueous solution and stir for 2h, let it stand for 1h until the chitosan solution is clear and transparent; add 1.5mL of acrolein into the chitosan solution, stir at 25°C for 1h and then Stand still for 3h to obtain superabsorbent chitosan hydrogel; the obtained chitosan hydrogel sample is swollen in distilled water, after reaching swelling equilibrium, take out and hang until no water drop drips out, weigh again, and the hydrogel swells to 1670mL (1.45kg).

Embodiment 2

[0028] Add 1.2513g of chitosan to 100mL of 0.5% v / v glacial acetic acid aqueous solution and stir for 1h, then sonicate for 0.5h until the chitosan solution is clear and transparent; add 900μL of acrolein into the chitosan solution, Ultrasound for 0.5h and then stand still for 2h to obtain a highly water-absorbent chitosan hydrogel; the obtained chitosan hydrogel sample was swollen in distilled water, and after reaching the swelling equilibrium, it was taken out and suspended until no water droplets dripped out, and then weighed, and the water The gel swelled to 1875 mL (1.63 kg).

Embodiment 3

[0030] Add 8.525g of chitosan to 100mL of 2% v / v nitric acid aqueous solution for mechanical stirring for 2h, then let it stand for 3h until the chitosan solution is clear and transparent; dilute 6mL of acrolein in 30mL of pure water, slowly add to chitosan In the sugar solution, stir mechanically at 80°C for 0.1h and then stand still for 0.1h to obtain a superabsorbent chitosan hydrogel; swell the obtained chitosan hydrogel sample in distilled water, and after reaching swelling equilibrium, take it out and hang it until there is no Water drops dripped out, and then weighed, the hydrogel swelled to 1720mL (1.49kg).

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Abstract

The invention discloses a preparation method of chitosan gel with high water absorbability. The chitosan gel with high water absorbability is prepared from acrolein, chitosan, pure water and common acid, and the preparation method comprises the following steps: adding the chitosan into an acidic aqueous solution, and conducting mechanical stirring until the chitosan is completely dissolved and the chitosan solution is clear and transparent; and adding acrolein and pure water, conducting uniform stirring, and conducting standing to form gel. The acrolein-modified chitosan hydrogel has a spatial network structure, so that the diffusion resistance of water molecules in the hydrogel is reduced, a larger accommodating space is provided for the water molecules, and the high-water-absorption chitosan hydrogel has a large-pore-diameter structure and better swelling property, and compared with chitosan hydrogel synthesized by a traditional method, the chitosan hydrogel has higher swelling rate. The method is mild in reaction condition and simple in preparation method.

Description

technical field [0001] The invention belongs to a superabsorbent gel material, in particular to a preparation method of a superabsorbent chitosan gel. Background technique [0002] Superabsorbent hydrogel is a polymer material with a three-dimensional network structure, which is not only insoluble in water but also able to swell in water and absorb and store a large amount of water. The water-absorbing materials used in the past, such as paper, cotton, hemp, etc., do not have a strong water-absorbing capacity, only dozens of times their own weight, and their water-retaining capacity is also quite poor. The superabsorbent hydrogel can not only absorb hundreds or even thousands of times its own weight in water, but also has strong water retention performance, and it is not easy to be squeezed out even by pressurized water. Moreover, superabsorbent hydrogels can exhibit different characteristics according to external stimuli (such as pH value, temperature, ion concentration, s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J3/075C08L5/08C08K5/07C08F251/00C08F216/34
CPCC08J3/075C08F251/00C08J2305/08C08K5/07C08F216/34
Inventor 李焰刘云唐健张跃飞
Owner CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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