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Thixotropic photocurable hydrogel and its preparation method and application

A light-curing and hydrogel technology, applied in the direction of additive processing, can solve the problems of only printing thin walls, the model is difficult to fix, the medium cannot be cured, etc., to increase the transparency, avoid whitening, and improve the degree of mixing. Effect

Active Publication Date: 2021-08-10
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The advantage of this technology is that no support is required, but the disadvantage is that it can only print thin walls, and the printed model is difficult to fix
Existing gels for embedded 3D printing technology include single-component carbomer hydrogel, gelatin, etc. After printing, the medium cannot be cured, and there are only thin-walled features without a solid structure

Method used

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  • Thixotropic photocurable hydrogel and its preparation method and application
  • Thixotropic photocurable hydrogel and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] (1) Mix 2 g of Carbopol940 rheology modifier with 1000 mL of deionized water, neutralize with sodium hydroxide solution during mixing, measure the mixture with a pH meter, stop titration when the mixture is completely mixed and becomes neutral, and obtain mixture A;

[0033] (2) Add 200 g of acrylamide monomer to 700 g of mixture A, mix briefly, add 1.25 g of polyethylene glycol 400 diacrylate, and continue mixing with a mechanical stirrer for 15 minutes to obtain mixture B;

[0034] (3) 0.1g TPO photoinitiator (liquid state, free radical type), drop in 700g mixture B, use mechanical stirrer to stir 2 hours under the dark condition, the gained mixture is standby after vacuum defoaming under the air pressure 250Pa;

[0035] (4) Take out the printed container, and use a 405nm, 100w near-ultraviolet light source to irradiate for 3 minutes at a distance of 5cm for curing to obtain a thixotropic photocurable hydrogel.

Embodiment 2

[0037] (1) Mix 0.5g Carbopol940 rheology modifier with 1000mL deionized water, use sodium hydroxide solution to neutralize during mixing, use pH meter to measure the mixture, stop titration when the mixture is completely mixed and appears neutral, and obtain mixture A;

[0038] (2) Add 250 g of acrylamide monomer to 1000 g of mixture A, mix briefly, add 1.25 g of polyethylene glycol 400 diacrylate, and continue mixing with a mechanical stirrer for 15 minutes to obtain mixture B;

[0039] (3) 0.5g TPO photoinitiator (liquid state, free radical type), drop in 1000g mixture B, use mechanical stirrer to stir 2 hours under dark condition, the gained mixture is standby after vacuum defoaming under the air pressure 0.5Pa;

[0040] (4) Take out the printed container and irradiate it with 460nm, 100w near-ultraviolet light at a distance of 5cm for 1 minute for curing to obtain a thixotropic photocurable hydrogel.

Embodiment 3

[0042] (1) Mix 1 g of Carbopol940 rheology modifier with 1000 mL of deionized water, neutralize with sodium hydroxide solution during mixing, measure the mixture with a pH meter, stop titration when the mixture is completely mixed and becomes neutral, and obtain mixture A;

[0043] (2) Add 225 g of acrylamide monomer to 905 g of mixture A, mix briefly, add 1.25 g of polyethylene glycol 400 diacrylate, and continue mixing with a mechanical stirrer for 15 minutes to obtain mixture B;

[0044] (3) 0.2g TPO photoinitiator (liquid state, free radical type), drop in 500g mixture B, use mechanical stirrer to stir 5 hours under the dark condition, the vacuum defoaming of gained mixture air pressure 500Pa is standby after defoaming;

[0045](4) Take out the printed container and irradiate it with 350nm, 80w ultraviolet light at a distance of 5cm for 5 minutes for curing to obtain a thixotropic photocurable hydrogel.

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Abstract

The invention discloses a thixotropic photocurable hydrogel and its preparation method and application. The preparation method comprises the following steps: fully mixing a rheology modifier and deionized water to obtain a mixture A; The mixture B is fully stirred with polyethylene glycol diacrylate; add a free radical photoinitiator to the mixture B, mix well and vacuum defoam to obtain a gel without bubbles; use ultraviolet light or ultraviolet light to irradiate defoaming After the gel, a cured hydrogel is obtained. The thixotropic photocurable hydrogel of the present invention is a new type of printing medium that can be photocured, has thixotropic properties, is transparent, and is soft, and can print transparent, soft, and photocurable complex models; The functions of glue light curing and thixotropy can preserve the complex entities after embedded 3D printing, and the properties of transparent software have great potential in the prediction of medical operations.

Description

technical field [0001] The invention belongs to the technical field of additive manufacturing, and in particular relates to a photocurable hydrogel material with thixotropic properties for embedded 3D printing and its preparation method and application. Background technique [0002] Embedded 3D printing (Embedded 3D printing) is a relatively new 3D printing technology, which uses a very thin hollow needle tube to extrude a variety of materials in a gel medium. Because the gel medium has certain thixotropic properties, it can recover in a short time after the needle tip is scratched, so the printed material of the next layer will not affect the material of the previous layer. , to realize the process of 3D printing. The advantage of this technology is that no support is required, but the disadvantage is that it can only print thin walls, and the printed model is difficult to fix. The existing gels used in embedded 3D printing technology include single-component carbomer hyd...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F290/06C08F220/56C08F2/48C08J3/075B33Y70/00
Inventor 何农跃赵景洲
Owner SOUTHEAST UNIV
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