The melt viscosity of FEP is lower than that of PTFE. The melt viscosity at 343 ~ 393℃ is 103 ~ 104Pa·s, which is higher than polyethylene with the same melting index. It can be molded by extrusion, injection and other methods. FEP is a translucent polymer with strong electrostatic adsorption. It is easy to absorb dust and impurities, which will affect the properties of processed products. Antistatic agent should be added during molding. Ptfe thermal conductivity is small, the processing should pay attention to the heating rate. Considering the corrosion effect under the forming temperature, the processing equipment should choose chromium steel or nitriding high alloy steel as the anticorrosion layer. Teflon insulated wires are widely used in various kinds of wiring in aerospace. Most of the wires used in the mil-w-22759, the U.S. military standard, are of this type. Its outstanding advantage is the temperature level up to 250℃, in this temperature for a long time its mechanical strength and electrical performance will not be affected, and at the same time excellent low temperature performance, this wire can be used at a low temperature of 60℃ for a long time. Secondly, due to the wide frequency range of ptfe, it is commonly used as the insulation of coaxial cable. There are also thermocouple wire insulation and H - class F - class motor outgoing wire
1. The viscous flow temperature of ptfe FEP is 265 ~ 278℃, and the forming temperature range is narrow, which makes forming difficult. Polytetrafluoroethylene used in wire and cable has various excellent performance, wide range of frequency, wide range of high and low temperature use, excellent chemical stability, high electrical insulation strength, good resistance to atmospheric aging, so the insulated wires with polytetrafluoroethylene have the above excellent performance.
2. The temperature of injection molding cylinder and nozzle is 320 ~ 400℃, the mold temperature is 200 ~ 230℃, and the injection pressure is 29.4 ~ 137.2mpa. Press molding press molding can produce a variety of plates, rods, laminates and filling products. Heat FEP to 290 ~ 370℃ to melt it, and then cool it to 150 ~ 200℃ to 7MPa to make the melt fill the mold, compact and release the product.
3. The length to diameter ratio of the extruder is greater than 15, the compression ratio is 3:1, the die temperature is 315 ~ 400℃, the pressure is different according to the product, ptfe is generally 0.98 ~ 17.64MPa. The quenching temperature of extruded products is 10 ~ 20℃, and the concentrated water dispersion solution of FEP is coated. In the dispersion solution of FEP, polyoxyethylene octylphenol ether, the concentration agent, can be added. Spraying, brush painting, boiling immersion coating, flame spraying and other methods can be used for coating construction, and then heating and plasticizing. In recent years, FEP's powder flow bed and electrostatic spraying technology have also been developed.
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