Improvement of Mechanical Properties of DLP 3D Printouts Using Waterborne PUA/PEGDMA Mixed Oligomer Resin and Analysis of Filtration Characteristics of Resin Dilution

Abstract

In this study, commercial waterborne oligomers, polyurethane acrylate (PUA) and poly(ethylene glycol) dimethacrylate (PEGDMA), were introduced to formulate waterborne resin for Digital Light Processing (DLP) 3D printing. From the investigation of the mechanical properties of the printouts, it was confirmed that the resin including both PUA and PEGDMA exhibited higher mechanical properties than a single oligomer resin. The residual resin on the surface was completely removed by washing with water, and the size distribution and filtration effect of suspended matter in the diluted resin were investigated to compare waste resins' effect on water pollution. The suspended matter in the dilution was reduced to less than one-third by filtering through a 0.45 mu m filter. The waterborne resin that can be washed with water and whose suspended matter in the waste is effectively removed by filtration is expected to contribute to the spread of DLP 3D printing by reducing water pollution.