Method for preparing high-strength polyvinyl alcohol hydrogel

A polyvinyl alcohol and hydrogel technology, applied in the field of polymer material preparation, can solve problems such as low mechanical strength, and achieve the effects of ultra-high strength and toughness, good biocompatibility and biodegradability, and simple preparation process

Active Publication Date: 2017-02-22
FUZHOU UNIV
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  • Abstract
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Problems solved by technology

[0005] The object of the present invention is to provide a kind of preparation method of high-strength polyvinyl alcohol hydrogel, aiming at the problem of low mechanical strength of existing polyvinyl alcohol hydrogel, adopt first cross-linking to form gel through freezing and thawing process, and then through A method for improving strength by immersing in saturated salt solution, constructing a physical cross-linked structure and microcrystalline regions in polyvinyl alcohol hydrogel, and preparing high-strength polyvinyl alcohol hydrogel

Method used

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  • Method for preparing high-strength polyvinyl alcohol hydrogel

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preparation example Construction

[0020] A preparation method of high-strength polyvinyl alcohol hydrogel, using polyvinyl alcohol as a starting material, dissolving in a high-temperature water bath to obtain a certain concentration of polyvinyl alcohol aqueous solution, introducing the polyvinyl alcohol aqueous solution into a mold, The polyvinyl alcohol hydrogel is obtained by subfreezing and thawing, and the polyvinyl alcohol hydrogel is soaked in a saturated saline solution to obtain a high-strength polyvinyl alcohol hydrogel.

[0021] Described preparation method specifically comprises the following steps:

[0022] 1) Add polyvinyl alcohol to deionized water and heat to dissolve to obtain a polyvinyl alcohol aqueous solution with a concentration of 5 wt% to 20 wt%;

[0023] 2) After introducing the polyvinyl alcohol aqueous solution obtained in step 1) into the mold, freeze at -40~-5 °C, and then thaw at a temperature of 20~60 °C, repeat the freezing and thawing process 2~5 times to obtain polyvinyl alcoh...

Embodiment 1

[0027] A preparation method for high-strength polyvinyl alcohol hydrogel, specifically comprising the steps of:

[0028] Take 5 parts of polyvinyl alcohol, add 95 parts of deionized water, heat and dissolve under stirring in a water bath to obtain a 5 wt% polyvinyl alcohol aqueous solution, introduce the polyvinyl alcohol aqueous solution into a molding mold, and freeze at -40 °C for 6 h, then thaw at room temperature 30 °C, and repeat the freezing and thawing process 5 times to obtain polyvinyl alcohol hydrogel, soak the polyvinyl alcohol hydrogel in saturated sodium chloride aqueous solution for 60 min, and obtain high-strength polyethylene alcohol hydrogel.

[0029] The water content of the gel was calculated using the following formula:

[0030] WC=(W s -W d ) / W s

[0031] W s — mass of swollen gel; W d —The weight of the gel after drying at 105 °C for 24 h.

[0032] The test of the tensile properties of the gel is as follows: the tensile test is carried out on a u...

Embodiment 2

[0035] A preparation method for high-strength polyvinyl alcohol hydrogel, specifically comprising the steps of:

[0036] Take 10 parts of polyvinyl alcohol, add 90 parts of deionized water, heat and dissolve under stirring in a water bath to obtain a 10 wt% polyvinyl alcohol aqueous solution, introduce the polyvinyl alcohol aqueous solution into a molding mold, and freeze at -20 °C for 10 h, then thaw at room temperature 30 °C, and repeat the freezing and thawing process 4 times to obtain polyvinyl alcohol hydrogel, soak the polyvinyl alcohol hydrogel in saturated potassium chloride aqueous solution for 20 min, and obtain high-strength polyethylene alcohol hydrogel.

[0037] According to the test method in Example 1, the obtained results are: tensile strength 1.62 MPa, elongation at break 652%, gel water content 88%.

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Abstract

The invention discloses a method for preparing a high-strength polyvinyl alcohol hydrogel. The method comprises the following steps: taking polyvinyl alcohol as an initial raw material, and heating and dissolving in a water bath, thereby obtaining a polyvinyl alcohol aqueous solution; performing repeated low-temperature freezing-thawing on the polyvinyl alcohol aqueous solution, thereby obtaining polyvinyl alcohol hydrogel; adding the polyvinyl alcohol hydrogel into a saturated saline solution, thereby obtaining the high-strength polyvinyl alcohol hydrogel. According to the invention, a hydrogen bond cross-linking structure and a microcrystalline domain are sequentially constructed by a two-step method, and then the high-strength polyvinyl alcohol hydrogel is prepared. The preparation method disclosed by the invention is simple and environmental-friendly, and the prepared high-strength polyvinyl alcohol hydrogel has excellent mechanical property, non-toxicity and high biocompatibility.

Description

technical field [0001] The invention belongs to the technical field of polymer material preparation, and in particular relates to a preparation method of high-strength polyvinyl alcohol hydrogel. Background technique [0002] Hydrogel is a kind of polymer material with a three-dimensional network structure containing a large amount of water. It has important application prospects in the fields of joint lubrication, biological tissue engineering, and drug controlled release carriers. Hydrogels are often required to have good mechanical properties during use, but conventional hydrogels are usually fragile and have poor mechanical properties, which greatly limit their application range. Polyvinyl alcohol is a water-soluble high molecular polymer that can be prepared by non-petroleum routes, and its properties are between rubber and plastic. Polyvinyl alcohol hydrogel has the advantages of biodegradability and good biocompatibility, and is widely used in many fields such as agr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J3/24C08J3/075C08L29/04
CPCC08J3/075C08J3/24C08J2329/04
Inventor 江献财项南平孙玉俊侯琳熙
Owner FUZHOU UNIV
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