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Preparation method of high-strength wear-resistant polyvinyl alcohol hydrogel

A polyvinyl alcohol and hydrogel technology, which is applied in the field of polymer material preparation, can solve the problems of not meeting the requirements of mechanical strength and the small improvement of the mechanical strength of polyvinyl alcohol.

Active Publication Date: 2020-06-26
重庆石墨烯研究院有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the reported literature has a small increase in the mechanical strength of polyvinyl alcohol, which still cannot meet the requirements of biomedical engineering applications for its mechanical strength.

Method used

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  • Preparation method of high-strength wear-resistant polyvinyl alcohol hydrogel
  • Preparation method of high-strength wear-resistant polyvinyl alcohol hydrogel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Disperse 0.025g of carbon nanotubes in 100g of deionized water, add 0.0125g of glycine and stir evenly at room temperature, use ultrasonic dispersion for 30min, the ultrasonic power is 500w, and the ultrasonic temperature is 50°C to obtain a dispersion of surface carboxylated carbon nanotubes;

[0020] Weigh 10 g of polyvinyl alcohol and add it to the above-prepared carboxylated carbon nanotube dispersion, heat and stir at 80°C for 2 hours to prepare a uniform composite solution; pour the solution into a mold, freeze at -40°C for 20 hours, and then Thaw at room temperature for 4 hours, cycle freezing-thawing 4 times; then place the formed sample in an oven at 50°C for 5 hours, and then soak it in 100g of ferric chloride solution with a mass concentration of 5% for 3 hours, and the obtained high-strength wear-resistant The polyvinyl alcohol hydrogel was stored in a 4°C refrigerator for later use. Its tensile strength was 6.12 MPa, its compressive modulus was 2.32 MPa, and...

Embodiment 2

[0022] Disperse 1.0g of graphite in 150g of deionized water, add 0.5g of hyaluronic acid and stir evenly at 70°C, use ultrasonic dispersion for 120min, the ultrasonic power is 2000w, and the ultrasonic temperature is 70°C to obtain a surface carboxylated graphite dispersion;

[0023] Weigh 25g of polyvinyl alcohol and add it to the carboxylated graphite dispersion prepared above, heat and stir at 85°C for 3.5h to prepare a uniform composite solution; pour the solution into a mold, freeze at -10°C for 18h, and then place at room temperature Thaw for 6 hours, cycle freezing-thawing twice; then place the formed sample in an oven at 70°C for 10 hours, and then soak it in 500 g of calcium chloride solution with a mass concentration of 10% for 6 hours, and the obtained high-strength and wear-resistant polyvinyl alcohol The hydrogel was stored in a 4°C refrigerator for later use. The tensile strength was 8.02MPa, the compressive modulus was 3.21MPa, and the friction coefficient was 0....

Embodiment 3

[0025] Disperse 1.3g of graphene in 200g of deionized water, add 0.67g of lysine and stir evenly at room temperature, use ultrasonic dispersion for 200min, the ultrasonic power is 4000w, and the ultrasonic temperature is 90°C to obtain a surface carboxylated graphene dispersion;

[0026] Weigh 50g of polyvinyl alcohol and add it to the carboxylated graphene dispersion prepared above, heat and stir at 95°C for 5h to prepare a uniform composite solution; pour the solution into a mold, freeze at -20°C for 16h, and then place at room temperature Thaw for 8 hours, cycle freezing-thawing 5 times; then place the formed sample in an oven at 90°C for 20 hours, and then soak it in 1000g of zinc chloride solution with a mass concentration of 20% for 13 hours, and the obtained high-strength wear-resistant polyvinyl alcohol The hydrogel was stored in a 4°C refrigerator for later use. The tensile strength was 9.54 MPa, the compressive modulus was 4.02 MPa, and the friction coefficient was 0....

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Abstract

The invention discloses a preparation method of high-strength wear-resistant polyvinyl alcohol hydrogel. The preparation method is characterized in that the characteristics of high strength, excellentwear resistance, self-lubricating property and easiness in functional modification of a carbon nano material are utilized. The method comprises the steps of introducing a carboxyl group to the surface; compounding with polyvinyl alcohol to prepare polyvinyl alcohol / carbon nano material composite hydrogel; preliminarily forming a gel sample by adopting a freezing and unfreezing crosslinking method; then, the intermolecular hydrogen bonding effect and the crosslinking degree are enhanced through annealing treatment; further soaking the polyvinyl alcohol hydrogel in a saline solution to enable the polyvinyl alcohol hydrogel and metal ions to form a complexing bonding effect, so as to construct a multi-network structure, and effectively play an excellent reinforcing role of the carbon nanoparticles, thereby greatly improving the mechanical strength and the wear-resistant self-lubricating property of the polyvinyl alcohol hydrogel.

Description

technical field [0001] The invention relates to a preparation method of high-strength wear-resistant polyvinyl alcohol hydrogel, which belongs to the field of polymer material preparation. Background technique [0002] Polyvinyl alcohol hydrogel is non-toxic, has excellent biocompatibility, excellent mechanical properties and anti-fatigue properties, and has received more and more attention in the field of biomedical engineering in recent years, such as artificial cartilage materials, tissue engineering scaffolds, biosensors, and biomedical sponges. At the same time, higher requirements are put forward for its mechanical strength, wear resistance and self-lubrication. People such as Zhang, BiomedicalMaterials, 2011,6 (5): 055008, have prepared polyvinyl alcohol / chitosan (PVA / CS) hydrogel by freezing-thawing method, and the swelling rate and tensile strength of this hydrogel are respectively 1200% and 2.2MPa, and the hydrogel has antibacterial properties similar to CS. Mans...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J3/075C08L29/04C08K9/04C08K3/04C08K3/16
CPCC08J3/075C08J2329/04C08K9/04C08K9/08C08K2201/011C08K3/041C08K3/04C08K3/16C08K2003/162C08K2003/168
Inventor 叶林姜楠曹金龙于亚茹王登诗赵晓文
Owner 重庆石墨烯研究院有限公司
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