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A hydrogel ink, a direct writing 3D printing ionic conductive hydrogel

A conductive hydrogel and 3D printing technology, applied in the field of hydrogels, can solve the problems of unsatisfactory mechanical properties of ion conductive hydrogels, unsatisfactory mechanical properties, and hindering practical applications.

Active Publication Date: 2022-03-22
LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the mechanical properties of most ion-conducting hydrogels are not ideal. For example, Wu et al. used polyacrylic acid and alginate chains to form amorphous calcium carbonate to prepare ionic skin sensors.
Flexible self-healing capacitive sensors can sense subtle pressure, such as small water droplets, but their mechanical tensile strength does not exceed 10kPa (Advanced Materials, 2017, 29, 1700321); Yang et al. prepared Li-ion / agar / polypropylene Amide-ionic hydrogels as dual sensors, including temperature sensing and strain sensing, have shown great application potential in flexible electronics, but their mechanical properties still cannot meet other requirements for practical use. (ACS Applied Materials & Interfaces, 2019, 11, 16765), which will hinder its practical application

Method used

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  • A hydrogel ink, a direct writing 3D printing ionic conductive hydrogel
  • A hydrogel ink, a direct writing 3D printing ionic conductive hydrogel
  • A hydrogel ink, a direct writing 3D printing ionic conductive hydrogel

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preparation example Construction

[0043] In the present invention, the preparation method of the hydrogel ink preferably comprises the following steps:

[0044] (1) heating and mixing polyvinyl alcohol with water to obtain an aqueous solution of polyvinyl alcohol;

[0045] (2) Chitosan and polyvinyl alcohol aqueous solution are ball-milled and mixed, and then acrylamide is added to the ball-milled mixed solution to obtain a premixed solution;

[0046](3) Mix the premixed solution with a photoinitiator and a crosslinking agent at 5-20° C. under light-shielded conditions to obtain a hydrogel ink.

[0047] The invention heats and mixes polyvinyl alcohol and water to obtain polyvinyl alcohol aqueous solution. In the present invention, the heating and mixing temperature is preferably 100° C.; in the present invention, the heating and mixing is preferably performed under stirring conditions, and the stirring rate is preferably 500-1000 rpm, more preferably 600-800 rpm. In the present invention, the polyvinyl alcoh...

Embodiment 1

[0063] (1) Take 3.22g of polyvinyl alcohol with a number average molecular weight of 89000-90000 and mix it with 26.78g of deionized water, and stir it mechanically at 100°C to obtain 30g of a polyvinyl alcohol aqueous solution with a mass concentration of 12%;

[0064] (2) Mix 3.75g chitosan with the above-mentioned polyvinyl alcohol aqueous solution by ball milling, the rotating speed of the ball milling is 1500rpm, and the time is 6min, add 6g acrylamide to the ball milling dispersion, and vigorously stir mechanically at 60°C to make it evenly dispersed , prepare the premixed solution;

[0065] (3) Add 0.1 g of photoinitiator α-ketoglutaric acid and 0.1 mL of cross-linking agent MBAA solution with a concentration of 10 mg / mL to the premixed solution, mechanically stir and mix evenly at 15° C. under light-shielding conditions, get hydrogel ink;

[0066] (4) The obtained hydrogel ink is placed in a centrifuge, and centrifuged at 8000rpm for 5min to remove air bubbles;

[00...

Embodiment 2

[0072] (1) Take 3.22g of polyvinyl alcohol with a number average molecular weight of 89000-90000 and mix it with 26.78g of deionized water, and stir it mechanically at 100°C to obtain 30g of a polyvinyl alcohol aqueous solution with a mass concentration of 12%;

[0073] (2) Mix 4.5g of chitosan with the above-mentioned polyvinyl alcohol aqueous solution by ball milling, the rotating speed of the ball milling is 1500rpm, and the time is 6min, add 6g of acrylamide to the ball milling dispersion, and vigorously stir mechanically at 60°C to make it evenly dispersed , prepare the premixed solution;

[0074] (3) Add 0.0015g of photoinitiator α-ketoglutaric acid and 0.1mL of cross-linking agent MBAA solution with a concentration of 10mg / mL to the premixed solution, mechanically stir and mix evenly at 10°C and in the dark, get hydrogel ink;

[0075] (4) The obtained hydrogel ink is placed in a centrifuge, and centrifuged at 7000rpm for 5min to remove air bubbles;

[0076] (5) Inject...

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Abstract

The invention provides a hydrogel ink and a direct writing 3D printing ion-type conductive hydrogel, belonging to the field of hydrogel technology. The ink provided by this application includes the following components in mass percentage: 5-12% polyvinyl alcohol; 3-18% chitosan; 11-20% acrylamide; 0.1-0.5% photoinitiator; ~0.01%; water 60~80%. Polyvinyl alcohol and chitosan are long-chain molecules that can be entangled to form a physical cross-linked network, so that the ink has rheological and thixotropic properties suitable for direct writing 3D printing, and can be smoothly extruded from the nozzle. After that, it can maintain good macroscopic structural characteristics without structural deformation and collapse; acrylamide has a carbon-carbon double bond group, and has excellent photocuring performance after adding a photoinitiator and a crosslinking agent. After 3D printing, ultraviolet light After curing, a chemically cross-linked network is formed, which can improve the mechanical strength and fatigue resistance of the hydrogel.

Description

technical field [0001] The invention relates to the field of hydrogel technology, in particular to a hydrogel ink and a direct writing 3D printing ion-type conductive hydrogel. Background technique [0002] Hydrogel is a kind of polymer with high water content and three-dimensional network structure, which is a basic material that is ubiquitous in life. By adjusting the type, composition and polymerization conditions of the polymer, it is possible to endow the hydraulic multifunctionality, such as transparency, stretchability, conductivity, etc. Conductive hydrogel-based sensors are stretchable, soft, and biocompatible, and are expected to be the material of choice for next-generation wearable devices. [0003] According to the different types of electrical signals transmitted, conductive hydrogels can be divided into electronically conductive hydrogels and ionically conductive hydrogels. Ionically conductive hydrogels can transmit electrical signals through charged ions, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F261/04C08F251/00C08F220/56C08F2/48C08J7/12C08L51/02C08L51/00
CPCC08F261/04C08F251/00C08F2/48C08J7/12C08J2351/02C08J2451/00C08F220/56
Inventor 王晓龙张晓琴麻拴红姬忠莹郭玉雄周峰
Owner LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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