Polytetrafluoroethylene porous fiber and manufacturing and modifying process thereof

A process for manufacturing and modifying a PTFE porous fiber, comprising the following steps:

• 1) presetting a blending device to a certain temperature, feeding the materials through a feeding port, blending, and controlling the melt temperature and the melt pressure to adjust the degree of PTFE fibrillation;
• *p1 2) extruding the blend melt through a die head, drawing and stretching the blend melt into continuous filaments by a spinning apparatus, and adjusting the fiber size by adjusting the specifications of the extrusion die, the spinning speed and the temperature;
• 3) removing the processing aid from the fiber, by feeding the stretched blend fiber into a solvent pool for removal by washing and etching or into a high-temperature oven for removal by high-temperature ablation;
• and
• 4) drying, and annealing the obtained PTFE porous fiber before collection, wherein
• the materials comprise a PTFE raw material and a processing aid;
• and
• wherein, in step 1), a modifying filler is added and blended, wherein the modifying filler is directly added during melt blending to realize in-situ modification, and
• wherein the modifying filler comprises one or more of a coloring agent, a flexibility modifying agent, a lubricant, a reinforcing agent, a conductive agent, a thermally conductive filler, and an antibacterial agent, in which the coloring agent comprises one or more of carbon black, color masterbatch particles, a dye, and a dye-fixing agent;
• the flexibility modifying agent comprises one or more of talc powder, a softener, and an anti-static agent;
• the lubricant comprises one or more of paraffin, vegetable oil, and polyethylene glycol;
• the reinforcing agent comprises one or more of polyether ether ketone, polyimide, and polyetherimide;
• the conductive agent comprises one or more of carbon nanotubes, carbon nanofibers, graphene, a metal powder, and Mxene;
• the antibacterial agent comprises one or more of silver nanofibers, silver powder, and zinc oxide;
• and
• the amount of the modifying filler is 1-50% of the total weight of the fiber.