Application of a sacrificial material to microstructure 3D light curing printing

Abstract

The invention provides application of a sacrificial material to microstructure 3D light curing printing. The application includes the following steps: step A, an image on an digital light processor (DLP) is projected to the contact face of a film and resin through a projection lens in a multi-material micro-stereoscopic lithography system, and resin monomers are subjected to photochemical reactionand are cross-linked into a solid; step B, the system is provided with two parallel scrapers, the scraper travelling ahead scrapes the old resin away, and the scraper travelling behind smears the resin backwards; step C, the system replaces liquid and coats the film; and step D, different materials are subjected to the steps repeatedly, and printing of a 3D sample is completed layer by layer. Theapplication has the beneficial effects: how to print hung and movable parts in microscale is provided through the multi-material printing system, and thus microscale full 3D printing is achieved. Meanwhile, a formula of photosensitive resin used as a sacrificial mechanism in 3D printing is also provided, and the application of the sacrificial resin to a support structure is further optimized on the basis.

Description

technical field [0001] The invention relates to the field of 3D printing, in particular to the application of a sacrificial material in microstructure 3D photocuring printing. Background technique [0002] With the development of 3D printing technology, its application range is also expanding, from structural engineering, material engineering, to biological and medical engineering; from macroscopic scale (above centimeter level) to microscopic scale (below millimeter). However, the defects of traditional 3D printing technology are also beginning to appear, such as multi-material, high precision (less than 50 microns), suspension structure and active structure, etc. At the Hongguang scale, in order to print the suspension structure and the movable structure, the existing method is to print the support structure at the same time, and then manually remove the support structure later. These supporting structures are often small columnar groups. For microscopic scales, manual m...

AI Technical Summary

Problems solved by technology

At the microscopic scale, manual mechanical removal of support structures has become unrealistic, or even impossible, because in microstructures, the mechanical removal process is firstly extremely demanding and expensive for tools, and secondly, it is extremely easy to damage the required structure

For this reason, Cabrera first proposed in 1998 to use sacrificial layer materials to make suspension structures in projection micro-stereolithography. Although Xia Chunguang and Fang Xuanlai proposed in 2009 to use low grayscale exposure of the same resin to realize the production of sacrificial structures in projection stereolithography technology, but this method will have different effects on different resins , even require different etching solutions for different resins

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