Method for preparing flexible polyvinyl alcohol hydrogel cold storing bag

A technology of polyvinyl alcohol and hydrogel, which is applied in the field of preparation of polyvinyl alcohol hydrogel refrigeration and fresh-keeping materials, can solve problems such as unfavorable refrigeration, refrigerated transportation, uneven heat absorption, and affect the effect of refrigeration and preservation, and achieve mechanical properties Excellent, good biocompatibility, moderate flexibility and strength

Inactive Publication Date: 2015-04-29
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The brittle, hard and frozen shape of the polyvinyl alcohol hydrogel cold storage bag prevents the polyvinyl alcohol hydrogel cold storage bag from being closely attached to the refrigerated and fresh-keeping products, and the heat absorption is uneven, which affects the effect of cold storage and preservation to a certain extent. In addition, this property also causes a lot of gaps between the polyvinyl alcohol hydrogel cold storage bags, resulting in useless spaces that are not conducive to refrigeration and refrigerated transportation.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Dissolve 5 grams of polyvinyl alcohol (specification: 2488) [using polyvinyl alcohol (specification: 1788) is also 5 grams], with stirring, dissolve in 100 grams of water, and stir and heat to 80 ° C to dissolve. Cool the polyvinyl alcohol aqueous solution to room temperature. According to polyvinyl alcohol and glycerol 1:4 (weight ratio), add glycerin to the cooled polyvinyl alcohol aqueous solution. Dissolve 1 gram of borax (1 gram of boric acid) in 5 grams of water with stirring, and heat to 50° C. and stir to dissolve. Cool the borax (or boric acid) aqueous solution to room temperature. At room temperature, add borax (or boric acid) aqueous solution to the polyvinyl alcohol aqueous solution with stirring. After standing still, it will coagulate into flexible polyvinyl alcohol hydrogel in a short time.

Embodiment 2

[0021] Dissolve 1 gram of polyvinyl alcohol (specification: 2488) [using polyvinyl alcohol (specification: 1788) is also 1 gram], with stirring, dissolve in 80 grams of water, and stir and heat to 80 ° C to dissolve. Cool the polyvinyl alcohol aqueous solution to room temperature. According to polyvinyl alcohol and glycerol 1:1 (weight ratio), add glycerin to the cooled polyvinyl alcohol aqueous solution. Dissolve 1 gram of borax (1 gram of boric acid) in 5 grams of water with stirring, and heat to 50° C. and stir to dissolve. Cool the borax (or boric acid) aqueous solution to room temperature. At room temperature, add borax (or boric acid) aqueous solution to the polyvinyl alcohol aqueous solution with stirring. After standing still, it will coagulate into flexible polyvinyl alcohol hydrogel in a short time.

Embodiment 3

[0023] Dissolve 5 grams of polyvinyl alcohol (specification: 2488) [using polyvinyl alcohol (specification: 1788) is also 5 grams], with stirring, dissolve in 100 grams of water, stirring can be heated to 80 ° C to dissolve. Cool the polyvinyl alcohol aqueous solution to room temperature. According to polyvinyl alcohol and glycerol 1:3 (weight ratio), add glycerin to the cooled polyvinyl alcohol aqueous solution. Dissolve 1 gram of borax (1 gram of boric acid) in 20 grams of water with stirring, and heat to 50° C. and stir to dissolve. Cool the borax (or boric acid) aqueous solution to room temperature. At room temperature, add borax (or boric acid) aqueous solution to the polyvinyl alcohol aqueous solution with stirring. After standing still, it will coagulate into flexible polyvinyl alcohol hydrogel in a short time.

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PUM

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Abstract

The invention provides a method for preparing a flexible polyvinyl alcohol hydrogel cold storing bag. The method for preparing the flexible polyvinyl alcohol hydrogel cold storing bag comprises the steps of cross-linking polyvinyl alcohol with borax, and adding a glycerin softening agent; or cross-linking polyvinyl alcohol with borax, and adding a glycerin softening agent to prepare flexible polyvinyl alcohol hydrogel with high water content. The flexible polyvinyl alcohol hydrogel can be packaged in a polyvinyl chloride or polyethylene plastic bag under vacuum to form the flexible polyvinyl alcohol hydrogel cold storing bag.

Description

technical field [0001] The invention relates to the preparation of a polyvinyl alcohol hydrogel cold storage and fresh-keeping material, in particular to a preparation method of a flexible polyvinyl alcohol hydrogel cold storage bag, which is suitable for refrigeration, refrigerated transportation and preservation of vegetables, fruits and aquatic products. Background technique [0002] The phenomenon of water gelation and cold storage has long attracted people's attention. Polyvinyl alcohol hydrogel is favored because of its low toxicity, excellent mechanical properties, and good biocompatibility, in addition to the properties of general hydrogels. The polyvinyl alcohol hydrogel can be made into a polyvinyl alcohol hydrogel cold storage bag by packing it into an encapsulated plastic bag. Polyvinyl alcohol hydrogel cold storage bags are widely used in food, aquatic products, chemical industry, medical treatment and other aspects abroad. Polyvinyl alcohol hydrogel cold stor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L29/04C08K3/38C08K5/053C08K5/098
Inventor 徐伟亮汪静徐子河
Owner ZHEJIANG UNIV
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