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A kind of stereolithography 3D printing hydrogel and preparation method thereof

A stereo light curing and 3D printing technology, applied in the field of 3D printing materials, can solve the problems of high crosslink density, uneven structure, affecting application, etc., and achieve the effect of low volume shrinkage, mild conditions and convenient operation.

Active Publication Date: 2021-08-31
XIAN TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the commonly used light-curing consumables are some high-molecular photosensitive resins. Although they have the advantages of fast curing speed and wide source of materials; however, high-molecular photosensitive resins usually have a strong irritating odor, and are usually based on fossils and are not renewable. Moreover, the curing shrinkage rate is relatively large during free radical polymerization, which greatly limits the fidelity and durability of the molded product
In addition, although the photosensitive resin system has a fast curing rate, due to its high cross-linking density and uneven structure, it usually shows low toughness and tends to become brittle, which seriously affects its application and limits the further development of 3D printers.

Method used

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  • A kind of stereolithography 3D printing hydrogel and preparation method thereof
  • A kind of stereolithography 3D printing hydrogel and preparation method thereof
  • A kind of stereolithography 3D printing hydrogel and preparation method thereof

Examples

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preparation example Construction

[0035] The preparation method of the above stereolithography 3D printing hydrogel comprises the following steps: (a) dissolving the hydrophilic macromolecular polysaccharide in deionized water, then adding the active monomer and the aqueous crosslinking agent Stir with the photoinitiator to obtain a hydrogel precursor solution; (b) import the hydrogel precursor solution into a 3D printer for printing operation. The whole preparation process has the advantages of mild conditions, energy saving, no pollution, fast speed, high precision, and convenient operation, so as to obtain an odorless, non-toxic, and degradable light-cured hydrogel, which can be widely used in DPL3D printers; at the same time , the cost of this type of hydrogel can be controlled within 20 yuan / kg, and the price is low.

[0036] In step (a), the auxiliary agent is also added to stir to obtain a hydrogel precursor solution. In step (a), the initiator is obtained by modifying the oily initiator precursor, whi...

Embodiment 1

[0039] This embodiment provides a method for preparing a stereolithography 3D printing hydrogel, which comprises the following steps:

[0040] (a) Add 200g of deionized water to a beaker, then add 1.6g of gelatin, after the gelatin is dissolved, add 80g of acrylamide (AM), 0.48g of polyethylene glycol-2-acrylate (PEG-DA), 0.24 g tetramethylethylenediamine and 3.2 g of modified 2,4,6-trimethylbenzoic acid diphenylphosphine oxide were added, and magnetic stirring was carried out at room temperature until completely dissolved to obtain a hydrogel precursor solution;

[0041] (b) Put the hydrogel precursor solution into a 3D printer (ultraviolet wave mode with a curing light source wavelength of 405nm), and set it under room temperature conditions (the number of base layers is 5, the curing time is 3s; the sample curing time is 2s; the edge curing time is 1s; forming Speed ​​0.6mg / s; molding thickness 0.1mm) to perform printing operation to obtain the desired product.

[0042] Th...

Embodiment 2

[0044] This example provides a preparation method for stereolithography 3D printing hydrogel, which is basically the same as that in Example 1, except that in step (a), acrylamide is not added, but N-iso Propyl acrylamide.

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Abstract

The invention relates to a stereolithography 3D printing hydrogel and a preparation method thereof. Its raw material components include active monomers, water-based crosslinking agents, photoinitiators, hydrophilic macromolecular polysaccharides and deionized water. The active monomer is acrylamide, or a mixture of acrylamide and N,N-methylenebisacrylamide; the quality of the aqueous crosslinking agent is 0.3 to 0.9% of the mass of the active monomer; the photoinitiator is Water-soluble, its mass is 2 ~ 6% of the mass of the active monomer; the hydrophilic macromolecular polysaccharide is selected from gelatin, xanthan gum, agar hyaluronic acid, alginate and sodium hydroxymethyl cellulose The mass of one or more components of the mixture is 0.5-3% of the mass of the active monomer; the mass ratio of the deionized water to the active monomer is 2-5:1. The products formed by UV curing have no irritating odor, can print models of any color, and have low volume shrinkage.

Description

technical field [0001] The invention belongs to the field of 3D printing materials, and relates to a hydrogel, in particular to a stereolithography 3D printing hydrogel and a preparation method thereof. Background technique [0002] 3D printing (Three Dimensional Printing) is a rapid prototyping technology, which was first proposed by Charles W. Hull in 1986; develop. [0003] 3D printing can be divided into base light powder sintering molding (SLS), stereolithography molding (SLA / DLP), fusion lamination molding (FDM) and layered solid manufacturing (LOM) according to its working principle. Among them, because DLP technology is a curing technology using ultraviolet light, it has the advantages of simple operation, fast forming speed, no pollution in the forming process, high precision of formed parts, and can be used in office environments. It is currently the most widely used in the market. [0004] However, the commonly used light-curing consumables are some high-molecul...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F289/00C08F251/00C08F220/56C08F222/38C08F220/54C08F220/20C08J3/075B33Y70/00
Inventor 马爱洁罗涛王磊周宏伟金洗郎
Owner XIAN TECH UNIV