3D打印制备密度可控的多孔轻质聚乳酸

3D Printing on Fabricating Porous Lightweight Polylactic Acid with Controllable Density

以含有发泡剂的轻质聚乳酸丝材(LW-PLA)为打印材料,通过改变熔融沉积(FDM)打印参数制备了不同密度的PLA多孔结构。设计了空心测试正方体模型进行三维(3D)打印,以探究打印温度对打印模型密度的影响,发现模型的密度随打印温度的升高出现先减小后增大的趋势。在打印温度为230℃时,模型达到最低密度0.52 g/cm~3,是190℃下打印模型密度的53%。此外还探究了230℃打印温度,40%~100%打印流量下不同测试试样的力学性能。打印试样的拉伸强度和杨氏模量在90%和100%打印流量时分别达到最大值16.4、543.8 MPa;打印试样的压缩强度、压缩模量及冲击强度均在100%流量时达到最大值,分别为20 MPa、591.2 MPa、17.5 kJ/m~2。LW-PLA为打印微孔结构并调节打印部件的密度和机械性能提供了一种新的途径,以实现传统方法无法实现的优良机械性能和轻量化的独特组合。

Based on lightweight polylactic acid filament(LW-PLA)with foaming agent as the printing material,PLA porous structures with different densities were fabricated by altering the printing parameters of fused decomposition modeling(FDM).In order to investigate the influence of printing temperature on the density of the printing model,a hollow test cube model was designed for three dimensional(3D)printing,and it is found that the density of the model decreases at first and then increases with the increasing of the printing temperature.At the printing temperature of 230 ℃,the density reaches the minimal value of 0.52 g/cm~3,which is 53%of the model printed at 190 ℃.Besides,the mechanical properties of different tested specimens are explored at the printing temperature of 230 ℃ during 40%-100%of flow rate.At 90%and 100%of flow rate,the tensile strength and the Young's modulus of the printed specimens could reach 16.4 MPa and 543.8 MPa,respectively.The compressive strength,the compression modulus as well as the impact strength of the printed specimen reach the maximum value at 100%of flow rate,which are 20 MPa,591.2 MPa and 17.5 kJ/m~2,respectively.LW-PLA provides a new approach to adjust the density and mechanical properties of FDM printed parts in order to achieve a unique combination of excellent mechanical properties as well as lightweight that traditional methods can not.