用于三维打印的蒙脱土改性尼龙丝材的性能

Properties of Montmorillonite Modified Nylon Filament for Three-Dimensional Printing

利用烷基铵盐对蒙脱土(MMT)有机化处理,以共聚尼龙6/66为基材,用熔融共混法制备蒙脱土改性共聚尼龙6/66的复合材料。运用X射线衍射测量蒙脱土的层间距,并对复合材料的力学性能、维卡软化点、熔体流动速率进行表征,观察复合材料冲击断面的扫描电子显微镜图,对所得结果进行分析讨论。将复合材料用3D耗材拉线机挤出成(1.75±0.25)mm的丝材,用熔融沉积制造打印机测试丝材的打印温度、流动性及打印层间黏合情况来判断丝材是否适用于打印。结果表明当OMMT质量分数为2%时,打印性能及综合热力学性能最佳。

Nylon filament was modificated with organically treated montmorillonite （MMT） by melt blending method using copolyamide 6/66 as the substrate. The interlayer spacing of MMT was measured by X-ray diffraction. The mechanical properties, the vicat softening point and melt flow rate of the modified copolyamide 6/66 were also characterized. Scanning electron microscopy was utilized to observe cross section of the modified copolyamide 6/66. With extruding the prepared compostie into a （1.75 _＋ 0.25） mm filament material by a three-dimensional （3D） consumable wire drawing machine, the modified copolyamide 6/66 was applied in 3D printing with a fused deposition modeling printer. We discussed whether the filament material was suitable for printing with changes in printing temperature, filament fluidity and inter-layer bonding condition. The printing performance and comprehensive thermodynamics of the copolyamide 6/66 modified by mass fraction 2% of OMMT were best.