PTFE at high temperature viscosity, does not flow, not soluble in various solvents and can not melt spinning and wet spinning method for producing the polytetrafluoroethylene fiber. Manufacture of PTFE fibers: one using cutting stretching, cut into thin strips about to PTFE film stretching; species is another way to set off a chemical fiber wet spinning, even poly four vinyl fluoride resin and a mixture of chemical fibers after spinning head, extruded fibers, and then into the line at a high temperature sintering, chemical fiber decomposition carbonization Yi to obtain PTFE fibers. PTFE fibers at low temperatures is still soft, woven vascular adult workers; may also be woven into a dynamic seals, dynamic seals this dynamic seals than asbestos have a wider temperature and chemical resistance. PTFE fibers woven into the fabric with PTFE has all the good characteristics can be used to manufacture artificial joints, protective clothing, cloth, insulation materials and packaging materials.

1. The first synthetic PTFE fiber raw material selection and preparation

(1) PTFE dispersion

Resin content: 60 ± 1%
Non-ionic surfactant tables: 5.5 ± 0.5%
Viscosity (20 ~ 25 ℃): 0.01 ~ 0.015Pa • s
pH: 7 to 10
The relative density (20 ℃): 1.5
No other suspended impurities.

(2) the maturity of around 7 viscose

(3) the preparation and formulation of the coagulation bath

Sodium 5.5kg
Zinc sulfate 1.3kg
2.5kg of concentrated sulfuric acid
Deionized water 0.04m3

In a container, distilled water was added first, and then add sodium zinc sulfate, and heated with stirring up to complete dissolution, then cooled concentrated sulfuric acid was slowly added to the solution, so that the coagulation liquid is made.

2. Synthesis followed by wet spinning process of PTFE fibers

The polytetrafluoroethylene dispersion is mixed with the adhesive, with a metering pump (0.6ml/min) After the above mixture was filtered with a filter into the spinning head (diameter 0.01mm), the spinning head is placed in a coagulation bath, After spinning the mixture in the first coagulation bath for coagulation into fibers and then the fiber was rinsed with water softener 95 ℃ roll leaching, and then the oil application roll (using Nylon # 2 oil), dried roll (surface temperature 150 ~ 200 ℃), sintering furnace (temperature 440 ℃, about 1m/min speed), the final stretch (temperature 420 ℃, stretched 8-9 times) to prepare polytetrafluoroethylene fibers.