用纳米粘土增强再生聚乳酸开发 3D 打印纤维

B. Basilia, Julius N. Concepcion, John Jerald Prila
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摘要

本研究的重点是通过回收利用过期的聚乳酸(PLA)长丝,开发适用于熔融沉积建模(FDM)的三维打印长丝。通过双螺杆挤出将蒙脱石(MMT)纳米粘土加入过期聚乳酸长丝中,以1%、3%和5 wt.%的不同浓度将三维打印长丝加工成颗粒。这些复合颗粒通过直径为 1.75 毫米的长丝挤压机再加工成长丝。这些长丝经过了不同的表征技术,以测试其机械性能和热性能。热性能表明,随着 MMT 纳米土用量的增加,玻璃化转变温度、结晶温度和熔化温度的值都在上升,而比热却在下降。此外,热重分析(TGA)显示,加入 MMT 后,热稳定性更好。在机械性能方面,研究表明,添加 1 wt% 的 MMT 纳米粘土后,拉伸强度和弹性模量都有所提高,与原始 3D 打印聚乳酸长丝相当。
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Development of 3D Printing Filaments from Recycled PLA Reinforced with Nanoclay
This study focused on the development of 3D printing filaments suitable for fused deposition modeling (FDM) by recycling expired polylactic acid (PLA) filaments. The 3D printing filaments were processed into pellets by incorporating montmorillonite (MMT) nanoclay into the expired PLA filaments through twin-screw extrusion with varying concentrations of 1%, 3%, and 5 wt.%. These composite pellets were reprocessed to filaments through a filament extruder with a diameter of 1.75 mm. These filaments underwent different characterization techniques to test its mechanical and thermal properties. The thermal properties showed increasing values in the glass transition temperature, crystallization temperature, and melting temperature with a decrease in the specific heat upon incorporating increasing amount of MMT nanoclay. Furthermore, thermogravimetric analysis (TGA) showed a positive impact with better thermal stability when the MMT content was incorporated. In terms of mechanical properties, the study showed that the addition of 1 wt% MMT nanoclay, provided an increase in both the tensile strength and elastic modulus comparable to the virgin 3D printing PLA filament.
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