Conductive masterbatches and conductive monofilaments

A process for the preparation of a polyester matrix powder containing a homogeneously dispersed carbon nanotube powder, comprising the steps of:

• 1) providing a carbon nanotube with a purity of more than 90% and having a length (L) of less than 2 μm and a L/D value of more than 100,
• 2) feeding the carbon nanotube into a ultrahigh-speed powder miller and milling at a speed of 20,000 to 30,000 rpm for 5 to 20 minutes to obtain a dispersed carbon nanotube powder,
• 3) adding the dispersed carbon nanotube powder obtained in step (2) into a polymer material of polybutylene terephthalate, and adding a dispersant and a chain extender thereinto to form a polyester matrix mixture,
• 4) feeding the polyester matrix mixture into a high-speed powder mixer and mixing it at a speed of 1,000 to 3,000 rpm for 10 to 90 minutes to make the carbon nanotube powder homogeneously and quickly dispersed in the polyester matrix mixture, thereby forming a polyester matrix powder containing homogeneously dispersed carbon nanotube.