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Modified chitosan-based super-absorbent gel and preparation and application thereof

A chitosan and superabsorbent technology, applied in the field of functional polymers, can solve problems such as application limitations, and achieve the effects of industrialization, broad application prospects, and simple and easy preparation process.

Active Publication Date: 2017-09-08
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the hydrogen bond of chitosan itself, it is insoluble in water, and its application is also limited.

Method used

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  • Modified chitosan-based super-absorbent gel and preparation and application thereof
  • Modified chitosan-based super-absorbent gel and preparation and application thereof
  • Modified chitosan-based super-absorbent gel and preparation and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] A modified chitosan-based superabsorbent hydrogel is prepared by the following method:

[0031] (1) succinyl chitosan and chitosan quaternary ammonium salt (total mass is 2 grams, wherein, succinyl chitosan and chitosan quaternary ammonium salt consumption are 75% and 25% respectively) Dissolve in 20 ml of sodium hydroxide aqueous solution, stir well, and mix well;

[0032] (2) Add 2 ml of cross-linking agent epichlorohydrin to the above solution, and stir at a constant temperature of 30° C. for 20 minutes;

[0033] (3) The resulting mixed solution was subjected to a cross-linking reaction at 80° C. for 2 hours;

[0034] (4) After the reaction finishes, the gained superabsorbent gel is first washed with water, and then cleaned with absolute ethanol;

[0035] (5) Finally, the modified chitosan-based superabsorbent gel can be obtained after freeze-drying.

[0036] The water absorption performance of superabsorbent gel is tested by weighing method, and the water absorpt...

Embodiment 2

[0042] A modified chitosan-based superabsorbent hydrogel is prepared by the following method:

[0043] (1) succinyl chitosan and chitosan quaternary ammonium salt (total mass is 2 grams, wherein, succinyl chitosan and chitosan quaternary ammonium salt consumption are 75% and 25% respectively) Dissolve in 20 ml of sodium hydroxide aqueous solution, stir well, and mix well;

[0044] (2) Add 1.5 milliliters of cross-linking agent epichlorohydrin to the above solution, and stir at a constant temperature of 30° C. for 20 minutes;

[0045] (3) The resulting mixed solution was subjected to a cross-linking reaction at 80° C. for 2 hours;

[0046] (4) After the reaction finishes, the gained superabsorbent gel is first washed with water, and then cleaned with absolute ethanol;

[0047] (5) Finally, the modified chitosan-based superabsorbent gel can be obtained after freeze-drying.

[0048] The water absorption rate of the modified chitosan-based superabsorbent gel prepared in this ex...

Embodiment 3

[0050] A modified chitosan-based superabsorbent hydrogel is prepared by the following method:

[0051] (1) succinyl chitosan and chitosan quaternary ammonium salt (total mass is 2 grams, wherein, succinyl chitosan and chitosan quaternary ammonium salt consumption are 50%) of set amount are dissolved in 20 mL of sodium hydroxide aqueous solution, fully stirred, and mixed evenly;

[0052] (2) Add 2 ml of cross-linking agent epichlorohydrin to the above solution, and stir at a constant temperature of 30° C. for 20 minutes;

[0053] (3) The resulting mixed solution was subjected to a cross-linking reaction at 80° C. for 2 hours;

[0054] (4) After the reaction finishes, the gained superabsorbent gel is first washed with water, and then cleaned with absolute ethanol;

[0055] (5) Finally, the modified chitosan-based superabsorbent gel can be obtained after drying at 40°C.

[0056] The antibacterial performance of superabsorbent gel is tested by absorbance method, and the antibac...

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Abstract

The invention discloses a modified chitosan-based super-absorbent gel and preparation and application thereof. The modified chitosan-based super-absorbent gel is prepared by blending and crosslinking two types of chitosan derivatives including succinyl-chitosan and chitosan quaternary ammonium salt. The preparation of the modified chitosan-based super-absorbent gel comprises the following steps of fully dissolving the succinyl-chitosan and the chitosan quaternary ammonium salt in alkaline aqueous solution; adding in a cross-linking agent of epichlorohydrin for thermostatic stirring at 30 DEG C for 20 minutes; increasing the temperature to 80 DEG C for heat-preserved reaction for 2 hours; performing washing and drying processes to obtained the modified chitosan-based super-absorbent gel. The water absorbency, the pH sensitivity and the antibacterial effects of the modified chitosan-based super-absorbent gel can be affected by preparation process parameters, and accordingly can be regulated by adjusting the utilization quantity of the two types of chitosan derivatives or the cross-linking agent; by taking the pure chitosan derivatives as base materials, which are natural polymers with good biodegradability, environmental pollution can be effectively avoided.

Description

technical field [0001] The invention belongs to the technical field of functional macromolecules, and in particular relates to a modified chitosan-based superabsorbent hydrogel and its preparation method and application. Background technique [0002] Superabsorbent gel has outstanding water absorption performance, so it is widely used in various industries such as chemical industry, material, pharmaceutical, environment and food, and the consumption is huge. Among them, in the fields of biomedical materials and physiological hygiene, there are certain special requirements for the performance of superabsorbent gels, such as biocompatibility, antibacterial properties, and biodegradability. Therefore, some natural polymers have gradually attracted the attention of researchers as raw materials for superabsorbent gels. At present, the researched natural polymer modified superabsorbent gels generally use natural polymers as modified components, which are added to synthetic polyme...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L5/08C08K5/1515C08J9/28C08J3/075C08J3/24
Inventor 何广华庆笑艳吕翠芳易英
Owner WUHAN UNIV OF TECH
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