Method for preparing conductive biological scaffold based on self-excited electrostatic field driven melt-jet three-dimensional (3D) printing

Abstract

The invention discloses a method for preparing a conductive biological scaffold based on self-excited electrostatic field driven melt-jet three-dimensional (3D) printing. The conductive biological scaffold is prepared by printing carbon nanomaterials / polymer composites driven by a self-excited electrostatic field. Printing equipment used is connected with a high-voltage direct-current power supplythrough a conductive patch wound on the shoulder of a nozzle to serve as an extraction electrode, so that high-resolution stable printing is achieved, and the problem of short circuit caused by the fact that high voltage is adjacent to a micro screw through a conductive composite material is solved.

Description

Technical field[0001]The invention relates to the technical field of 3D printing, in particular to a method for preparing a conductive biological scaffold based on self-excited electrostatic field-driven melt jet 3D printing.Background technique[0002]Polymer matrix composites (PMC), through the addition of various nanomaterials, such as one-dimensional nanomaterials (such as carbon nanotubes, nanowires, nanofibers, etc.), two-dimensional nano (such as graphene, etc.), three-dimensional nano (such as nano Balls, nano crystal grains, etc.), with more excellent comprehensive performance. It has been widely used in aerospace, automotive, biomedical and tissue engineering, electronics, new materials, energy, wearable devices, flexible sensors, robots and many other fields, showing huge and broad prospects for industrial applications.[0003]The 3D printing technology developed in recent years provides a brand new solution for the preparation and molding of PMC. Researchers at home and abro...

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Problems solved by technology

However, this method uses a nozzle. Because the composite material is conductive, there is a problem that the entire micro-screw and the system are easily connected to the high-voltage electricity on the nozzle, which will cause a short circuit in the printing system.

[0005] ZL201710528176.8 discloses an electric field-driven spray deposition 3D printing device. This method only uses a connected ring-shaped extraction electrode to provide the required electric field, does not require a grounded counter electrode, and the ring electrode does not directly contact the nozzle. There are limitations in material jet deposition 3D printing in terms of printing materials, nozzle materials, and substrate materials, but there are still some problems. In actual use, it is difficult to ensure that the ring electrode and the nozzle are concentric with high precision, which affects the stability of the electric field during high-precision printing. , affecting the accuracy of the printed results

The applicant found that because the extraction electrode is a flat plate electrode, the center is set as a circular through hole, the wall thickness, that is, the distance between the outer diameter and the central circular hole is relatively large, and the inner diameter of the extraction electrode does not fit the outer wall of the nozzle, resulting in an electric field The focusing effect is not ideal, and the electric field strength directly under the nozzle is low, which affects the high-stable electric field requirement for high-precision printing

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