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Preparation method of self-healing hydrogel

A hydrogel and self-healing technology, applied in the field of self-healing hydrogel preparation, can solve the problems of wide chain length distribution, long repair time, poor mechanical strength, etc., to promote the formation of dynamic chemical bonds and promote dynamic Bond formation, effects of excellent mechanical properties

Active Publication Date: 2020-11-17
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the irregular cross-linking point and wide chain length distribution of the traditional covalent cross-linking method, ordinary hydrogels have disadvantages such as high brittleness, low tensile properties, poor mechanical strength, relatively weak mechanical properties and long repair time. Time often limits the depth of application of these hydrogels

Method used

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  • Preparation method of self-healing hydrogel
  • Preparation method of self-healing hydrogel
  • Preparation method of self-healing hydrogel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] according to Figure 8 The steps shown to prepare ultrafast self-healing hydrogels:

[0037] 1) Weigh 10g of polyvinyl alcohol (abbreviation: PVA) and 0.5g of 4,4`-diphenylmethane diisocyanate (abbreviation: MDI) and dissolve in 40g of 98°C deionized water to make MDI modified PVA, in Water bath at 95° C., under nitrogen atmosphere, stirring at 600 rpm for 1 h to obtain modified reactant A.

[0038] 2) Add 2.5 g of glycerol to the modified reactant A, and stir for 1 h in a water bath at 95° C. under a nitrogen atmosphere at a stirring speed of 600 rpm to obtain the modified product B.

[0039] 3) Dissolve 0.76g of sodium tetraborate decahydrate and 0.13g of boric acid in 50mL of deionized water to form a mixed solution (referred to as: BB solution) and add it to the modified product B, and stir in a water bath at 95°C with a stirring speed of 600rpm for 20min to obtain Milky white gel.

[0040] 4) Take out the milky white gel and put it in a mold and press it for 1 h...

Embodiment 2

[0042] The ultrafast self-healing hydrogels were prepared according to the following steps:

[0043] 1) Weigh 10g of PVA and 0.5g of MDI and dissolve in 40g of 98°C deionized water, stir in a water bath at 95°C in a nitrogen atmosphere at a stirring speed of 600rpm for 1h to obtain modified reaction product A.

[0044] 2) Add 5.0 g of glycerin to the modified reactant A, and stir for 1 h in a water bath at 95° C. under a nitrogen atmosphere at a stirring speed of 600 rpm to obtain the modified product B.

[0045] 3) Dissolve 0.76g of sodium tetraborate decahydrate and 0.13g of boric acid in 50mL of deionized water to form a mixed solution and add it to the modified product B. Stir in a water bath at 95°C at a stirring speed of 600rpm for 20min to obtain a milky white gel.

[0046] 4) Take out the milky white gel and put it into a mold and press it for 1 hour to remove internal air bubbles and microcracks to obtain a sample, then freeze it in a refrigerator at -20°C for 6 hours...

Embodiment 3

[0048] The ultrafast self-healing hydrogels were prepared according to the following steps:

[0049] 1) Weigh 10g of PVA and 0.5g of MDI and dissolve in 40g of 98°C deionized water, stir in a water bath at 95°C in a nitrogen atmosphere at a stirring speed of 600rpm for 1h to obtain modified reactant A.

[0050] 2) Add 7.5g of glycerol to the modified reactant A, and stir for 1 hour in a water bath at 95°C under a nitrogen atmosphere at a stirring speed of 600rpm to obtain the modified product B.

[0051] 3) Dissolve sodium tetraborate decahydrate (0.76g) and boric acid (0.13g) in 50mL of deionized water to form a mixed solution and add it to the modified product B. Stir in a water bath at 95°C with a stirring speed of 600rpm for 20min to obtain a milky white gel. glue.

[0052] 4) Take out the milky white gel and put it into a mold and press it for 1 hour to remove internal air bubbles and microcracks to obtain a sample, then freeze it in a refrigerator at -20°C for 6 hours, ...

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Abstract

The invention discloses a preparation method of self-healing hydrogel, and belongs to the technical field of preparation of novel self-healing soft materials. The preparation method comprises the following specific steps: 1) dissolving polyvinyl alcohol and 4,4-diphenylmethane diisocyanate in deionized water, and stirring the mixture under the protection of inert gas to obtain a modified reactantA; 2) adding glycerol into the modified reactant A in the step 1), and stirring under the protection of inert gas to obtain a modified product B; 3) adding a mixed solution of sodium tetraborate decahydrate and boric acid into the modified product B, and preparing milky white gel by a thermal crosslinking method; and 4) taking out the milky white gel, pressing the gel to remove internal bubbles and microcracks, and performing a freezing-unfreezing process to obtain the ultrafast self-healing hydrogel. The self-healing hydrogel has an ultra-fast self-healing capability, also has good optical, electrical and mechanical properties, and can be used in the field of wearable equipment soft materials.

Description

technical field [0001] The invention belongs to the technical field of preparation of novel self-healing soft materials, and in particular relates to a preparation method of self-healing hydrogel. Background technique [0002] Smart hydrogel materials are widely used in medical fields such as biomedicine and tissue engineering. As a functional material, the application of hydrogel in the fields of medical treatment, health, environmental protection, industry and agriculture has developed rapidly, such as for artificial organs, wearable electronic devices, drug carriers, biological electrodes and sensors, etc. The state of the industry. However, due to the irregular cross-linking point and wide chain length distribution of the traditional covalent cross-linking method, ordinary hydrogels have disadvantages such as high brittleness, low tensile properties, poor mechanical strength, relatively weak mechanical properties and long repair time. Time often limits the depth of app...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J3/075C08J3/24C08L29/04C08K5/29C08K5/053C08K3/38
CPCC08J3/075C08J3/24C08J2329/04C08K5/29C08K5/053C08K2003/387C08K3/38
Inventor 李孟宇解国新
Owner TSINGHUA UNIV