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Method for controlling precision of extrusion type 3D printing polymer line width

A 3D printing, polymer wire technology, applied in the field of 3D printing, can solve the problems of limited printing accuracy, harsh printing conditions, and rough printing boundaries

Active Publication Date: 2021-10-01
GUANGDONG UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The invention provides a method for controlling the line width accuracy of extrusion-type 3D printing polymers to solve technical problems such as harsh printing conditions (melting or light curing), rough printing boundaries, and limited printing accuracy in the prior art.

Method used

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  • Method for controlling precision of extrusion type 3D printing polymer line width
  • Method for controlling precision of extrusion type 3D printing polymer line width
  • Method for controlling precision of extrusion type 3D printing polymer line width

Examples

Experimental program
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Effect test

Embodiment 1

[0061] Take PVA-C3-NH 2 -0.3 (the modification rate can be determined by nuclear magnetic resonance spectrum (hydrogen spectrum)) is the printing substrate, and the sample printing is carried out. The specific process is as follows:

[0062] PVA-C3-NH 2 -0.3 dissolved in N,N-dimethylformamide to prepare PVA-C3-NH 2 -0.3 3D printing solution with a concentration of 200mg / ml (for the prepared 3D printing solution see Figure 4 );

[0063] 3D printing was performed with 30% ethanol aqueous solution as a coagulation bath (printing parameters: needle diameter 0.26mm, barrel temperature 20-30°C, air pressure 0.05Mpa, speed 6mm / s) to obtain printed samples;

[0064] Place the obtained printed samples in pure water at room temperature, soak for 7 days, change the water every 12 hours during this period, until the residual organic solvent is completely removed, put the bracket into a glass bottle filled with water, and place it in an oven for hydrothermal treatment ( Set the water ...

Embodiment 2

[0066] Same as Example 1, the difference is that the side chain uses PVA-C4-CHO-0.83 (i.e. PVB) grafted with n-butyraldehyde to polyvinyl alcohol (the molecular weight and hydrolysis rate of polyvinyl alcohol are constant) as the printing substrate; carry out sample printing , the specific process is as follows:

[0067] Dissolve PVB in N,N-dimethylformamide to prepare a 3D printing solution with a concentration of 175 mg / ml ( Image 6 It is the solubility parameter diagram of the aldehyde group series, the abscissa is the modification rate, and the ordinate is the solubility parameter; two completely parallel straight lines, the upper one is the solubility parameter curve of the organic solvent DMSO, and the lower one is the solubility parameter curve of the organic solvent DMF ;The other six curves from top to bottom are the solubility curves of aldehyde-based samples whose carbon chains are C3, C4, C5, C6, C7, and C8 aldehyde-modified. The solubility is similar, which prove...

Embodiment 3

[0073] Same as Example 1, the difference is that the side chain uses PVA-C6-CHO-0.45 of n-hexanal grafted polyvinyl alcohol (the molecular weight and hydrolysis rate of polyvinyl alcohol are constant) as the printing substrate, and the sample printing is carried out. The specific process is as follows:

[0074] Dissolve PVA-C6-CHO-0.45 in N,N-dimethylformamide to prepare a 3D printing solution with a PVA-C6-CHO-0.45 concentration of 175 mg / ml (see Figure 12 );

[0075] Use water as a coagulation bath for 3D printing (printing parameters: needle diameter 0.26mm, barrel temperature 20-30°C, air pressure 0.05Mpa, speed 4.5mm / s) to obtain a printed sample; place the printed sample in pure water at room temperature In the medium, soak for 7 days, change the water every 12 hours until the residual organic solvent is completely removed, put the bracket into a glass bottle filled with water, and place it in an oven for hydrothermal treatment. Also in order to achieve the best shrinka...

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Abstract

The invention relates to the technical field of 3D printing, in particular to a method for controlling precision of extrusion type 3D printing polymer line width. The method specifically comprises the following steps of dissolving short alkane chain grafted polyvinyl alcohol in an organic solvent to obtain a 3D printing solution, and performing 3D printing to obtain a printing sample; and soaking the printing sample in water and then placing in hot water for hydro-thermal treatment to obtain the 3D printing polymer. According to the method, the printing sample is subjected to hydro-thermal treatment, so that the size of the printing sample is reduced, and the reduction times of the printing sample are different under different hydro-thermal treatment temperature conditions, so that the reduction times of the printing sample can be controlled by controlling the hydro-thermal treatment temperature, and the technical purpose of controlling the line width precision of an extrusion type 3D printing polymer is achieved.

Description

technical field [0001] The invention relates to the technical field of 3D printing, in particular to a method for controlling the line width accuracy of extrusion-type 3D printing polymers. Background technique [0002] 3D printing is an additive manufacturing method that generates 3D structures in a layer-by-layer manner through computer-aided design and manufacturing. It has been widely used in various fields, such as implants, medical devices, regenerative medicine, drug delivery and tissue engineering. Wait. Extrusion 3D printing is to extrude the ink material into filaments through appropriate driving force such as mechanical pressure or gas, and build a three-dimensional structure in a set position through computer motion control in a layer-by-layer manner. Extrusion 3D printing can realize It is suitable for printing large-scale and complex structures, and is suitable for a wide range of ink materials, and the cost is relatively low. In extrusion 3D printing, materi...

Claims

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Application Information

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IPC IPC(8): B29C64/112B29C64/393B33Y10/00B33Y50/02B33Y70/00C08L29/14
CPCB29C64/112B29C64/393B33Y10/00B33Y50/02B33Y70/00C08L29/14
Inventor 徐静宇任东海曹秀华高粱霍延平罗继业李跃
Owner GUANGDONG UNIV OF TECH
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