用于FDM的蒙脱土改性PC/ABS合金丝材的性能

Properties of Montmorillonite Modified PC/ABS Alloy Filament for FDM

用有机改性后的蒙脱土(OMMT)对聚碳酸酯(PC)/丙烯腈-丁二烯-苯乙烯(ABS)合金进行增容改性,测试合金的力学性能、维卡软化点、熔体流动速率等性能,并对测试结果进行分析讨论。发现当PC∶ABS质量比=70∶30,OMMT质量分数为3%时,综合力学性能最好,拉伸强度为67. 21 MPa,弯曲强度为80. 90 MPa,缺口冲击强度为17. 35 k J/m^2,均优于纯PC/ABS合金的力学强度。将PC/ABS/OMMT合金用3D打印耗材挤出机挤出成直径为(1. 75±0. 25) mm的丝材,当OMMT质量分数为3%时,丝材成型性最佳。最后用熔融沉积成型的方法打印合金,比较熔融沉积成型与传统注塑成型制品的力学性能差异。熔融沉积成型试样保持了较好的拉伸强度和弯曲强度,达注塑成型的60%多,但是断裂伸长率和抗缺口冲击强度较差。

The polycarbonate(PC )/acrylonitrile-butadiene-styrene(ABS)alloy was compatibilized with organically modified montmorillonite(OMMT).Then various properties of the alloy were tested,such as,the mechanical properties,vicat softening point and melt volume-flow rate and so on.The test results were analyzed and discussed.The results show when PC∶ABS=70∶30 and the mass fraction of OMMT is 3%,the mechanical properties of PC/ABS alloy are the best.The tensile strength of the alloy is 67.21 MPa,the flexural strength is 80.90 MPa,and the notch impact strength of PC/ABS is 17.35 kJ/m 2 ,which are all better than the PC/ABS alloy without OMMT.The PC/ABS/OMMT alloy is extruded into a(1.75±0.25)mm filament material by a consumable material extruder,when the mass fraction of OMMT is 3%,the filament formability is best.Finally,printing the alloy by the way of fused deposition molding,the difference of mechanical properties of the alloy are compared between FDM and conventional injection molding.The samples with FDM could keep better tensile strength and flexural strength,which are 60%of injection molding samples,however the elongation at break and notch impact strength are poor.