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A kind of preparation method of pva hydrogel with three-dimensional network structure

A technology of network structure and hydrogel, which is applied in the field of preparation of PVA hydrogel, can solve problems such as toxicity, and achieve the effects of avoiding addition, wide application, and simple and efficient preparation process

Active Publication Date: 2022-05-20
CHANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Among them, the chemical cross-linking method forms covalent bonds between polymer chains by adding chemical cross-linking agents, such as boric acid, glutaraldehyde (GA), etc., but the added chemical cross-linking agents will have certain toxicity.

Method used

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  • A kind of preparation method of pva hydrogel with three-dimensional network structure
  • A kind of preparation method of pva hydrogel with three-dimensional network structure
  • A kind of preparation method of pva hydrogel with three-dimensional network structure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] (1) Disperse the measured PVA1399 powder into distilled water at 90°C, stir and mix for more than 3 hours at a stirring speed of 1000r / min to prepare a PVA1399 aqueous solution (solution concentration 15%), and measure its viscosity. (2) The rheological behavior was tested at 10°C, and an appropriate amount of PVA solution was coated on a glass plate to a height of 250 μm using a casting knife (Elcometer Ltd., Manchester, UK). After water evaporation at 40°C for about 12 hours, a PVA hydrogel film was obtained. And test its gel content, crystallinity, water resistance, swelling degree and mechanical properties. as shown in Table 3.

Embodiment 2

[0022] In Example 1, PVA1399 was replaced with PVA1499, and other conditions were kept constant, to prepare a polyvinyl alcohol hydrogel film. The prepared polyvinyl alcohol hydrogel film was subjected to the above tests to characterize its performance, as shown in Table 3.

Embodiment 3

[0024] In Example 1, PVA1399 was replaced with PVA1799, and other conditions were kept constant, to prepare a polyvinyl alcohol hydrogel film. The prepared polyvinyl alcohol hydrogel film was subjected to the above tests to characterize its performance, as shown in Table 3.

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Abstract

The invention discloses a preparation method of PVA hydrogel with a three-dimensional network structure, comprising the following steps: (1) dissolving PVA resin in deionized water according to a certain mass ratio and mixing uniformly to obtain a PVA aqueous solution, wherein the PVA resin The molecular weight is selected from 57000‑120000; (2) The PVA aqueous solution is coated on a flat plate to form a film, and then the water is evaporated at 40‑60 °C for 6‑24 hours to obtain the target product PVA hydrogel. The invention influences the gelation process of the PVA in the aqueous solution by selecting the molecular weight of the PVA and the film forming temperature, thereby regulating the cross-linking density of the PVA hydrogel film, and obtaining the PVA hydrogel film with high strength and high water resistance.

Description

technical field [0001] The invention belongs to the field of preparation of PVA hydrogel, and in particular relates to a preparation method of PVA hydrogel with a three-dimensional network structure. Background technique [0002] Polyvinyl alcohol (PVA) is a biodegradable and environmentally friendly polymer material with good water solubility and film-forming properties. At the same time, based on the hydrogen bond interaction between the intermolecular and intramolecular hydrogen bonds in the PVA chain, the PVA gel has a good cross-linked structure and mechanical strength. However, if the hydrogen bond in the PVA gel is strong, it has only a limited effect on the degree of crosslinking of the PVA gel, which leads to poor water resistance and mechanical strength of the PVA gel. At present, the strength of hydrogen bonds is mainly improved by chemical and physical cross-linking methods. [0003] Among them, the chemical cross-linking method forms covalent bonds between pol...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J5/18C08J3/075C08L29/04
CPCC08J5/18C08J3/075C08J2329/04
Inventor 马文中张鹏王思远曹峥夏艳平钟璟刘春林
Owner CHANGZHOU UNIV
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