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Method for preparing xanthan gum-based self-repairing hydrogel by using grape residue

A hydrogel, self-healing technology, applied in the nano field with strong mechanical properties and repairing properties, can solve problems such as not allowing gel materials

Pending Publication Date: 2020-01-14
LUDONG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the development of mechanical damage and cracks in practical applications does not allow the gel material to perform its function for a long time.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Example 1: Extraction of Cellulose Nanocrystals (CNCs) from Wine Grape Residue

[0022] Extract 50-100 grains of wine grape residue in benzene alcohol solution for 6 hours, dry at 60 degrees Celsius, adjust the pH value to 3.6-4.0 with acetic acid, add sodium chlorite, and react at 78 degrees Celsius for 1 hour. After filtering the filter residue, add sodium hydroxide to react at 60 degrees Celsius for 4 hours, freeze-dry to prepare cellulose; weigh 0.2 g of cellulose, 10.5 g of choline chloride, 9.5 g of oxalic acid dihydrate, and mix choline chloride and dihydrate Mix oxalic acid in a 150 ml three-necked flask until a viscous liquid is produced, then add cellulose, and react in an oil bath under mechanical stirring for 4 hours. After the reaction, ultrasonic dispersion, centrifugation, and dialysis are performed, and finally the product Cellulose nanocrystals were prepared by freeze-drying.

Embodiment 2

[0023] Example 2: Preparation of cellulose nanocrystal / polydopamine nanocomposite

[0024] Weigh 0.3 g of cellulose nanocrystals and 0.3 g of dopamine hydrochloride, add 60 ml of Tris-HCl buffer solution into a 300 ml three-necked flask reaction vessel, ultrasonically disperse for 20 minutes, and stir for 8 hours at 25 degrees Celsius. After the reaction is finished, the product is taken out for centrifugal washing, and the final product is freeze-dried.

Embodiment 3

[0025] Example 3: Using CNCs@PDA to design xanthan gum-based self-healing hydrogel

[0026] 3 ml of acrylic acid, 3 ml of potassium persulfate solution, 10 ml of XG solution, 1 ml of Fe3+ and different amounts of CNCs@PDA to prepare xanthan gum-based self-healing hydrogel, pour the hydrogel into a mold and place at 45 °C Dry in oven. By changing the amount of CNCs@PDA nanoparticles, the experiment was repeated, and the optimal amount was found through tensile testing.

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PUM

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Abstract

The invention uses wine-making grape residue to extract cellulose nano-crystal, and designs a cellulose nano-crystal / polydopamine nano composite material by surface modification of the extracted cellulose nano-crystal based on mussel-inspired chemistry. The cellulose nano-crystal is extracted by mainly using a choline chloride and oxalate dihydrate deep eutectic solvent to dissolve amorphous areasof the cellulose surface, the cellulose nano-crystal is modified by using the mussel-inspired chemistry to prepare the nano-crystal / polydopamine nano composite material (CNC@PDA) under weak alkalineconditions, and the obtained CNC@PDA is implanted into a xanthan gum-type hydrogel to prepare a xanthan gum-based nano composite hydrogel with relatively strong mechanical properties and repairing properties.

Description

technical field [0001] The invention uses wine grape residues to prepare cellulose nanocrystals, uses mussel-like chemistry to modify cellulose nanocrystals to prepare cellulose nanocrystals / polydopamine nanocomposites (CNCs@PDA), and implants them into xanthan gum Among the type hydrogels, the preparation of nanocomposite hydrogels with strong mechanical properties and repair properties belongs to the field of functional polymers. Background technique [0002] As a soft-wet material composed of a large amount of water and a three-dimensional cross-linked polymer network, hydrogel has been widely used in tissue engineering, flexible sensors, drug delivery and other fields. However, the development of mechanical damage and cracks in practical applications does not allow the gel material to perform its function for a long time. The development of new functional hydrogels (such as self-healing hydrogels, shape memory, responsive hydrogels, etc.) is one of the current research ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J3/075C08F251/02C08F251/00C08F283/00C08F220/06C08G73/06C08L51/02C08L51/00
CPCC08F251/00C08F251/02C08F283/00C08G73/0672C08J3/075C08J2351/02C08J2383/00C08F220/06
Inventor 陈厚丁欣欣柏良久蒋红娟张欣华王文香杨华伟杨丽霞
Owner LUDONG UNIVERSITY