English name: FEP (ethylene fluoride)
YOZONETECH FEP is a co-property of tetluoroethylene and hexafluoropropylene. The content of hexafluoropropylene is about 15%. It is a modified material for Teflon. Full name: perfluoroethylene propylene copolymer (perfluoroethylene copolymer), referred to as polyperfluoroethylene propylene, also known as F46.
FEP has a crystal melting point of 580 degrees F and a density of 2.15g/CC (g/cm3). It is a soft plastic with low pull strength, wear resistance and creep performance compared to many engineering plastics. It is chemically inert and has a lower dielecometer constant, about 2.1, over a wide temperature and frequency range. This material does not self-ignite and can prevent the spread of flame.
YOZONETECH's FER tube also has excellent weather resistance, low coefficient of friction, and can be used in environments from low temperatures to 392 degrees F. The material can be made into granular products for extrusion molding, can be used as fluidized beds and electrostation spray powder, can also be made into water dispersion. Semi-finished products include films and sheets. Rods and single fibers.
YOZONETECH sells FEP ingredients in the U.S. market, including DuPont's Teflow brand, Dakin's Neoflo brand, and Hoechst Celanese's IHoustaflow brand. Its main use is to manufacture the inner layer of pipes and chemical equipment, the surface of the cylinder, as well as a variety of wire and cable, such as aircraft hooks, boost cables, alarm cables, flat-panel cables and oil logging cables. FEP films have been used as films for solar collectors.
F46 resin not only has similar properties to Teflon, but also has good thermoplastic processing properties. Therefore, it compensates for the difficult treatment of Teflon, making it an alternative to Teflon materials, and is widely used in the production of electronic equipment wires and cable transmission wires in high temperature and high frequency use, electronic computer internal connecting wires, aviation wire insulation and special installation wires, oil pump cables and submersible motor windings.
YOZONETECH has also been working to develop more industrial uses that already have higher product performance.
According to the processing needs, F46 can be divided into ball balls, dispersants and coatings three types. Among them, the ball group according to its melt index can be used for molding, extrusing and injection molding; Dispersions are used for impregnation and sintering; This kind of paint is used for spraying.
1. Structural characteristics of PVC propylene
Like Teflon, F46 resins are perfluorinated. The difference is that some fluorine atoms in the main chain of F46 are replaced by teflone (-CF3).
It can be seen that although F46 resin and Teflon are composed of fluorocarbon elements, but the carbon chain is completely surrounded by fluorine atoms, but F46's large molecular main chain has a branch chain and side chain. This structural difference has no significant effect on the upper limit of the temperature range of the material under long-term stress. The upper temperature of F46 is 200 degrees C and the maximum operating temperature of PTFE is 260 degrees C. However, this structural difference makes the F46 resin have a fairly clear melting point, can be molded with general thermoplastic processing methods, greatly simplifying the processing process. This is not available in Teflon. This is the main purpose of the modified Teflon with hexafluoropropylene.
2. Performance of PFC propylene
The content of hexafluoropropylene in F46 has an effect on the performance of co-polymers. The content of hexafluoropropylene in F46 resins currently produced is usually 14% to 15% (mass fraction).
2.1 Physical.
There is currently no feasible way to determine the molecular weight of F46 resins. However, the viscosity of the melt is lower than 103 to 104Pa.s of Teflon at 380 degrees C. It can be seen that the molecular weight of F46 is much lower than that of Teflon.
The composition of the co-polymer is different, and the melting of the F46 is not the same. When the content of hexafluoropropylene in the co-polymer increases, the melting point decreases. The results of differential thermal analysis show that the melting point of domestic F46 resin is between 250 and 270 degrees C, which is lower than the melting point of PTFE.
F46 resin is a crystalline polymer with a crystalline degree lower than Teflon. When the F46 melt cools slowly to a temperature below the melting point of the crystal, the large molecules recrystry, crystallization between 50% and 60%; When the melt cools quickly through quenching, the crystallization is small, between 40% and 50%. The crystal structure of F46 is a spter crystal structure, which is different according to resin, processing temperature and heat treatment method.
2.2 Electrical insulation
The electrical insulation performance of the F46 is very similar to that of PTFE. Its dielectural coefficients range from deep cold to maximum operating temperatures, from 50Hz to 1010Hz over a wide ultra-high frequency range, and are very low, at around 2.1. The dielec frequency does not change much, but not with temperature.
The volume resistivity of the F46 resin is very high and is generally greater than 1015 . m, the temperature does not change much and is not affected by water and moisture. The arc resistance is greater than 165s.
The knock-through field of F46 increases with the decrease of thickness. When the thickness is greater than 1mm, the knock-through field is stronger than 30KV/mm, but does not vary with temperature.
2.3 Thermal performance
The heat resistance of F46 resin is second only to Teflon and can be used continuously in the temperature range of -85 to 200 degrees C. Even under extreme conditions of -200 degrees C and 260 degrees C, their performance does not change and can be used for a short period of time.
The thermal decomposition temperature of F46 resin is higher than the melting point temperature, and significant thermal decomposition occurs above 400 degrees C. The decomposition products are tetluoroethylene and hexafluoropropylene. Since F46 molecules usually have the same end-base and break down at temperatures above the melting point, proper ventilation must also be performed during processing above 300 degrees C. The F46 is fairly stable below the melting point temperature, but the mechanical strength loss is large at 200 degrees C. The increase in the melting index can be used to analyze the decrease in melting viscosity and the thermal decomposition of the co-property.
The F46 is still not completely hard and brittle at -250 degrees C, but still maintains a small elongation and a certain degree of flexibility. It is even better than Teflon (PTFE) and worse than all other types of plastics.
2.4 Resistant to chemical corrosion
The F46 is chemically resistant to Teflon and has excellent chemical resistance. In addition to reactions with fluorine, molten alkali metals, and chlorine trinofluoride at high temperatures, corrosion is not occurring when in contact with other chemicals.
2.5 Mechanical properties
Compared with PTFE, F46 hardness and pull strength are slightly improved, and the coefficient of friction is slightly greater than PTFE. At room temperature, F46 has good anti-creep performance. However, when the temperature is above 100 degrees C, the creep resistance is not as good as PTFE.
2.6 Other properties
F46 resin has good antioxidant properties in the atmosphere and high atmospheric stability. The F46 has better radiation resistance than PTFE and slightly less than polyethylene. At air and room temperature, the minimum absorption dose at which F46 begins to change performance is 105-106rad (i.e. 103-104Gy), which can be used as an anti-radiation material.
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