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Polyvinyl alcohol hydrogel, method for preparing same and application of polyvinyl alcohol hydrogel

A technology of polyvinyl alcohol and polyvinyl alcohol solution, applied in medical science, prosthesis, etc., can solve the problems of easy damage, poor hydrogel strength, instability, etc., achieve short time, improve accuracy, and ensure uniformity Effect

Active Publication Date: 2017-06-09
ZHENGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] 2. The water-insoluble hydrogel formed by physical cross-linking is reversible, and it is easy to re-dissolve in water under certain conditions, which is unstable; the physical cross-linked hydrogel has poor strength and is easy to break

Method used

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  • Polyvinyl alcohol hydrogel, method for preparing same and application of polyvinyl alcohol hydrogel
  • Polyvinyl alcohol hydrogel, method for preparing same and application of polyvinyl alcohol hydrogel
  • Polyvinyl alcohol hydrogel, method for preparing same and application of polyvinyl alcohol hydrogel

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preparation example Construction

[0040] The 3rd technical problem to be solved in the present invention is to provide a kind of preparation method of polyvinyl alcohol hydrogel microtube, comprising the steps:

[0041] 1) Preparation of polyvinyl alcohol solution: Polyvinyl alcohol and an organic solvent are heated and dissolved at 110°C to 145°C to obtain a polyvinyl alcohol solution. The organic solvent is dimethyl sulfoxide (DMSO) and N-N, dimethyl formazan The mixed solvent of amide (DMF), the volume ratio of dimethylsulfoxide (DMSO) and N-N, dimethylformamide (DMF) is 0.25-1; the mass concentration of the obtained polyvinyl alcohol solution is 10-30%;

[0042] 2) Preparation of microtubes: casting the polyvinyl alcohol solution obtained in step 1) into a mold, standing to cool to room temperature to form polyvinyl alcohol microtubes with a gel structure, and then using solution extraction to remove the organic solvent therein;

[0043]The mold comprises: a mold body 1 and a mold core 2; the mold body 1 h...

Embodiment 1

[0055] The preparation of embodiment 1 polyvinyl alcohol hydrogel

[0056] Weigh 11 grams of polyvinyl alcohol (PVA), dry at 60 degrees Celsius for 24 hours, weigh 35.20 grams of DMSO, 45.48 grams of DMF (the volume ratio of DMSO to DMF is 4:6), seal the bottle, and place it into a room with a temperature of 130 degrees. Heat in an oven (or in an oil bath) until the PVA is completely dissolved, and stir with a magnetic stirrer to dissolve the PVA evenly to obtain a PVA solution; let the PVA solution stand and cool down to room temperature naturally, and stand at room temperature for 6 hours to ensure that the PVA gel is fully formed. crosslinking. Remove the organic solvent in the PVA gel by solvent extraction: soak the prepared PVA gel in deionized water, replace the deionized water every 6 hours, and circulate 4-6 times. A standard tensile sample of PVA gel was prepared for tensile test and rheological performance test to characterize the mechanical properties and thermal s...

Embodiment 2

[0057] The preparation of embodiment 2 polyvinyl alcohol hydrogel

[0058] Weigh 10.84 grams of polyvinyl alcohol (PVA), dry at 60 degrees Celsius for 24 hours, weigh 26.4 grams of DMSO, 53.06 grams of DMF (the volume ratio of DMSO to DMF is 3:7), the bottle is sealed, and placed in a room with a temperature of 130 degrees. Heat in an oven (or in an oil bath) until the PVA is completely dissolved, and stir with a magnetic stirrer to dissolve the PVA evenly to obtain a PVA solution; let the PVA solution stand and cool down to room temperature naturally, and stand at room temperature for 6 hours to ensure that the PVA gel is fully formed. crosslinking. Remove the organic solvent in the PVA gel by solvent extraction: soak the prepared PVA gel in deionized water, replace the deionized water every 6 hours, and circulate 4-6 times. A standard tensile sample of PVA gel was prepared for tensile test and rheological performance test to characterize the mechanical properties and therma...

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Abstract

The invention relates to polyvinyl alcohol hydrogel, a method for preparing the same and application of the polyvinyl alcohol hydrogel, and belongs to the field of polymeric hydrogel. The method for preparing the polyvinyl alcohol hydrogel includes heating and dissolving polyvinyl alcohol and organic solvents at the temperature of 110-145 DEG C to obtain polyvinyl alcohol solution; allowing the obtained polyvinyl alcohol solution to stand still to naturally cool the polyvinyl alcohol solution until the temperature of the polyvinyl alcohol solution reaches the room temperature so as to obtain polyvinyl alcohol with gel structures; removing the organic solvents from the polyvinyl alcohol with the gel structures to obtain the polyvinyl alcohol hydrogel. The organic solvents are blended solvents with dimethyl sulfoxide and N-N, dimethylformamide, and a volume ratio of the dimethyl sulfoxide to the N-N, dimethylformamide is 0.25-1; the mass concentration of the obtained polyvinyl alcohol solution is 10-30%. The polyvinyl alcohol hydrogel, the method and the application have the advantages that an appropriate proportion of solvents are applied when the polyvinyl alcohol solution is prepared, and accordingly the polyvinyl alcohol hydrogel can be prepared from the obtained polyvinyl alcohol solution in standing and natural cooling modes.

Description

technical field [0001] The invention relates to a polyvinyl alcohol hydrogel, a preparation method and application thereof, and belongs to the field of polymer hydrogels. Background technique [0002] Polyvinyl alcohol hydrogel is chemically inactive, non-toxic, has good biocompatibility, excellent mechanical properties, high water absorption, and is easy to process and shape. It is widely used in agriculture, forestry, medicine, daily chemical industry, environmental protection and desert control. and other fields. [0003] At present, physical cross-linking, chemical cross-linking or radiation cross-linking can be used to prepare polyvinyl alcohol hydrogel to form a water-insoluble gel. Wherein the method of physical cross-linking is to make the polyvinyl alcohol undergo physical cross-linking to form a gel by freezing-thawing the polyvinyl alcohol solution and freezing and thawing it multiple times. [0004] However, the physical cross-linking method has the following d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J3/075C08J3/24C08L29/04C08L27/16C08L33/12A61L27/16A61L27/50A61L27/52
CPCA61L27/16A61L27/507A61L27/52C08J3/075C08J3/24C08J2329/04C08J2427/16C08J2433/12C08L29/04C08L27/16C08L33/12
Inventor 王市伟马帅江冷瑜婷刘梦涛吕剑青刘钰梅开南张斌斌周笑麟魏一灵李倩
Owner ZHENGZHOU UNIV
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