PA 6/碳纳米管共混导电单丝的制备和性能研究

Preparation and properties of PA 6/carbon nanotubes blended conductive monofilament

将炭黑导电母粒、碳纳米管母粒、聚己内酰胺(PA 6)切片按一定质量配比共混,在双螺杆机挤压下,经注带、冷却制得共混切片,将共混切片在卧式纺丝机上进行纺丝,经拉伸、上油等制得导电单丝,研究了不同配比的导电单丝的导电性能和力学性能。结果表明:随着共混切片中炭黑和碳纳米管总量的减少、PA 6含量的增加,其纺丝时最大可拉伸倍数呈现单调上升;炭黑与碳纳米管在导电单丝拉伸过程中具有协同作用,拉伸后的导电单丝的表面电阻可达到10~4Ω/cm水平;炭黑母粒质量分数为40%,碳纳米管母粒质量分数为30%,PA 6质量分数为30%时,制得的导电单丝导电性能和力学性能好,其表面电阻为1.5×10~4Ω/cm,电阻率为4.2×10~5Ω·cm,断裂强度为12.2 cN/tex,断裂伸长率为12.3%。

A blended chip was prepared by blending and extruding carbon black conductive masterbatch, carbon nanotube mas- terbatch and polyamide 6 （ PA 6） chip at a specific mass ratio through a twin-screw extruder prior to casting and cooling and was spun into conductive monofilament through drawing and oiling subsequent to spinning process on a horizontal spinning machine. The conductivity and mechanical properties of conductive monofilament with different mass ratio were studied. The results showed that the maximum draw ratio was increased monotonically with the decrease of the total amount of carbon black and carbon nanotubes and the increase of PA 6 content in the blended chip; carbon black and carbon nanotubes played a synergistic effect during the drawing process of conductive monofilament; the surface resistance of conductive monofilament reached the level of 10^4 Ω/cm after drawing; the obtained conductive monofilament had fairly good conductivity and mechanical properties, involving the surface resistance of 1.5×10^4Ω/cm, resistivity of 4.2 ×10^5Ω·cm, breaking strength 12.2 cN/tex and elongation at break 12.3%, when the mass fraction of carbon black masterbatch, carbon nanotube masterbatch and PA 6 were 40% ,30% and 30%, respectively.