Preparation method of high-strength polyvinyl alcohol hydrogel

Preparation method of high-strength polyvinyl alcohol hydrogel

  • CN 106,432,759 B
  • Filed: 10/12/2016
  • Issued: 10/09/2020
  • Est. Priority Date: 10/12/2016
  • Status: Active Grant
First Claim
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1. A preparation method of high-strength polyvinyl alcohol hydrogel is characterized by comprising the following steps:

  • taking polyvinyl alcohol as a raw material, heating and dissolving the polyvinyl alcohol into a water solution, introducing the solution into a forming mold, freezing and unfreezing to obtain polyvinyl alcohol hydrogel, taking out the hydrogel from the mold, and adding the hydrogel into a saturated salt solution for soaking to obtain high-strength polyvinyl alcohol hydrogel;

    the method specifically comprises the following steps;

    adding polyvinyl alcohol into deionized water, and dissolving in water bath under heating to obtain polyvinyl alcohol aqueous solution;

    introducing the polyvinyl alcohol aqueous solution obtained in the step

         1) into a mold, freezing at-40 to-5 ℃

    , then thawing at the temperature of 20-60 ℃

    , and repeating the freezing and thawing process for 2-5 times to obtain a polyvinyl alcohol hydrogel;

    soaking the polyvinyl alcohol hydrogel obtained in the step

         2) in a saturated salt solution to obtain a high-strength polyvinyl alcohol hydrogel;

    the saturated salt solution used in the step

         3) is monovalent sodium chloride or potassium chloride aqueous solution.

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