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High-strength self-repair ultraviolet shielding conductive PVA hydrogel and preparation method thereof

A self-healing and external shielding technology, applied in the field of new high-strength self-healing PVA hydrogel, can solve the problem of single function, and achieve the effect of improving strength, excellent UV absorption, and good biocompatibility

Inactive Publication Date: 2019-02-12
FUJIAN AGRI & FORESTRY UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The present invention aims at the single function of the current self-repairing PVA hydrogel, and firstly prepares a talcum powder / tannic acid compound. Because the compound contains talcum powder, it has a strengthening effect on the PVA hydrogel, and at the same time it can make the water The gel has UV reflective properties; the compound also contains tannic acid, which can make the PVA hydrogel have UV absorption function; in addition, the hydrogel also contains aluminum ions, which can give the hydrogel electrical conductivity

Method used

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  • High-strength self-repair ultraviolet shielding conductive PVA hydrogel and preparation method thereof
  • High-strength self-repair ultraviolet shielding conductive PVA hydrogel and preparation method thereof
  • High-strength self-repair ultraviolet shielding conductive PVA hydrogel and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0022] (1) Preparation of tannic acid coated talc powder:

[0023] First, weigh 0.2 g of talcum powder and add it to 100 ml of water. After being uniformly dispersed by ultrasonic treatment, add 0.2 g of tannic acid, adjust the pH value of the solution to 8, and stir and react at 20°C for 8 hours. Finally, the talcum powder / tannic acid complex was separated in a centrifuge at 10,000 rpm.

[0024] (2) Preparation of high-strength self-healing UV-shielding conductive PVA hydrogel:

[0025] Add 0.4 g of talcum powder / tannic acid complex into 20 ml of ethylene glycol / water solution (the volume ratio of ethylene glycol to water is 1:1), and disperse evenly by ultrasonic treatment, then add 2 g of polyvinyl alcohol, heat To 95 ° C to completely dissolve the PVA. The solution was placed in a mold, then frozen in liquid nitrogen for half an hour, taken out and then thawed at room temperature for 3 hours, and finally added to a 0.1mol / L aluminum ion solution and soaked for 0.5 hours ...

Embodiment 2

[0027] (1) Preparation of tannic acid coated talc powder:

[0028] First, weigh 0.3 g of talcum powder and add it to 100 ml of water. After being uniformly dispersed by ultrasonic treatment, add 0.3 g of tannic acid, adjust the pH value of the solution to 8, and stir and react at 20°C for 8 hours. Finally, the talcum powder / tannic acid complex was separated in a centrifuge at 10,000 rpm.

[0029] (2) Preparation of high-strength self-healing UV-shielding conductive PVA hydrogel:

[0030] Add 0.6 g of talcum powder / tannic acid complex into 20 ml of ethylene glycol / water solution (the volume ratio of ethylene glycol to water is 1:1), disperse evenly by ultrasonic treatment, then add 3 g of polyvinyl alcohol, heat To 95 ° C to completely dissolve the PVA. Put the solution into a mold, freeze it in liquid nitrogen for half an hour, take it out and thaw it at room temperature for 3 hours, and finally add 0.1mol / l aluminum ion solution and soak it for 0.5 hours to prepare PVA hydr...

Embodiment 3

[0032] (1) Preparation of tannic acid coated talc powder:

[0033] First, weigh 0.4 g of talc powder and add it to 100 ml of water. After being uniformly dispersed by ultrasonic treatment, 0.4 g of tannic acid was added, and the pH value of the solution was adjusted to 8, and the reaction was stirred at 20°C for 8 hours. Finally, the talcum powder / tannic acid complex was separated in a centrifuge at 10,000 rpm.

[0034] (2) Preparation of high-strength self-healing UV-shielding conductive PVA hydrogel:

[0035] Add 0.8 g of talcum powder / tannic acid complex to 20 ml of ethylene glycol / water solution (the volume ratio of ethylene glycol to water is 1:1), disperse evenly by ultrasonic treatment, then add 4 g of polyvinyl alcohol, heat To 95 ° C to completely dissolve the PVA. Put the solution into a mold, freeze it in liquid nitrogen for half an hour, take it out and thaw it at room temperature for 3 hours, and finally add 0.1mol / l aluminum ion solution and soak it for 0.5 hou...

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Abstract

The invention belongs to the technical field of hydrogel and specifically relates to high-strength self-repair ultraviolet shielding conductive PVA hydrogel and a preparation method thereof. The method comprises the steps: wrapping the surface of talcum powder by gallotannic acid; then adding into polyvinyl alcohol (PVA) / ethylene glycol water solution to be evenly mixed; soaking into aluminum ionsafter being frozen to prepare the high-strength self-repair ultraviolet shielding PVA hydrogel. According to the high-strength self-repair ultraviolet shielding conductive PVA hydrogel disclosed by the invention, talcum powder / gallotannic acid compound is utilized, so that the PVA hydrogel can simultaneously have high strength and ultraviolet shielding performance; meanwhile, the aluminum ions are utilized, so that the hydrogel has electrical conductivity; thus, the three defects of low strength, no ultraviolet shielding and no electrical conductivity of ordinary PVA hydrogel are improved, and the PVA hydrogel has higher application value.

Description

technical field [0001] The invention relates to a novel high-strength self-repairing PVA hydrogel, in particular to a high-strength self-repairing ultraviolet shielding conductive PVA hydrogel and a preparation method thereof. Background technique [0002] Hydrogel is a gel with water as the dispersion medium. A part of hydrophobic groups and hydrophilic residues are introduced into the water-soluble polymer with a network cross-linked structure. joint polymer. Hydrogel is a polymer network system, which is soft in nature, can maintain a certain shape, and can absorb a large amount of water. Although there are many kinds of materials for preparing hydrogels, polyvinyl alcohol (PVA) has always been the polymer of choice for preparing hydrogels. This is mainly because PVA hydrogel has the advantages of low toxicity, high water absorption and good biocompatibility in addition to the properties of general hydrogels, so it is very popular. Therefore, PVA hydrogels are widely ...

Claims

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Application Information

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IPC IPC(8): C08L29/04C08K13/06C08K9/10C08K3/34C08K5/053C08J3/075
CPCC08J3/075C08J2329/04C08K3/34C08K5/053C08K9/10C08K13/06
Inventor 刘凯黄六莲陈礼辉
Owner FUJIAN AGRI & FORESTRY UNIV
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