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The Basic Information Of Fluoropolymers, Including PTFE,FEP,PFA,PVDF,PCTFE,ECTFE And PVF
- Jun 16, 2018 -

     PTFE is a perfluoropolymer prepared by free radical polymerization of tetrafluoroethylene. It has a linear molecular structure of a repeating unit of CF2 / CF2, is a crystalline polymer with a melting point of about 631 F and a density of 2.13-2.19 g / C (g / cubic centimeter). PTFE has excellent chemical resistance, its dielectric constant is 2.1, the loss factor is low, and it is stable in a wide range of temperature and frequency. It has good mechanical properties from low temperature to 550 V. The impact strength of PTFE is high, but the tensile strength, wear resistance and creep resistance of PTFE are worse than those of other engineering plastics. Sometimes fiberglass, bronze, carbon and graphite are added to improve their special mechanical properties. Its friction coefficient is lower than any other material and has a high oxygen index. PTFE can be made into granular material, condensed fine powder 0.2 micron) and water dispersions. Granular resin is used for compression molding and plunger extrusion; fine powder can be gelatinized into thin wall material; dispersions can be used as coatings and impregnated porous materials. Pure PTEE products sold in the United States include Auimont USAundefineds AI-goflo, DU out, Teflon, ICI Aericas Inc.undefineds fi brand and HOechstCelaneseundefineds HOSaflon. PTFE has very high melt viscosity, which hinders the adoption of conventional melt extrusion or moulding techniques. The moulding and extrusion methods of granular PTFE are similar to those used in powdered metals and ceramics-first compressed and then sintered at high temperature; the fine powder is mixed with processing accessories (such as naphtha) to form a paste, and then squeezed into thin-walled materials at high pressure. Remove volatile processing aids by reheating and sintering.

 PTFE Molding Powder  Medium Particle DF101.jpg

 

     FEP is synthesized by copolymerization of tetrafluoroethylene and hexafluoropropylene. FEP crystallizes with a melting point of 580 F and a density of 2.15 g / c (g / cubic centimeter). It is a soft plastic with lower tensile strength, wear resistance and creep resistance than many engineering plastics. It is chemically inert and has a low dielectric constant of 2.1g in a wide range of temperatures and frequencies. The material does not ignite and can prevent the flame from spreading. It has excellent weather resistance, low friction coefficient, from low temperature to 392 Fahrenheit can be used. The material can be made into granular products for extrusion and moulding, powder for fluidized bed and electrostatic coating, or water dispersions. Semi-finished products have film, plate. Rods and single fibers. FEP, distributed in the U.S., has DUIPontundefineds Teflon, Daikinundefineds Neoflo, Hoechst Celaneseundefineds IHoustaflow. Its main purpose is to make inner villages for pipes and chemical equipment, the surface of rollers and all kinds of wires and cables, such as aircraft hooks, booster cables, alarm cables, Flat cable and well logging cable. FEP film has been used as thin coating for solar collecto

 

 

 

     The modified temperature of PFA is 260 degrees Celsius. PFA resin based on perfluoroalkoxy resin is relatively new fluorine plastics which can be melt processed. The melting point of the PFA is about 580 degrees Fahrenheit, and the density is 2.13-2.16g / cc. (g / cubic centimeter. PFA is similar to PTFE and FEP, but at 302 ℃ or above, the mechanical properties are slightly better than FEPF and can be used at temperatures up to 500 degrees Fahrenheit. Its chemical resistance is similar to that of PTEF. PFA is in the form of granular products for moulding and extruding, powder products for rotary moulding and coatings, and semi-finished products for films, plates, rods and pipes. PFA resins sold in the United States include DUPOut Teflon, Daikin, Neoflon, Ansimont, Hthen, HOechst Celanese, Hostafl, PFA, and FEP.FEP Granule Heating Wire.jpg


     PCTFE is the product of the polymerization initiated by free radical of chlorotrifluoroethylene (TFE) with a linear main chain of a CFC cl-CF unit. PCTFE is a crystalline polymer with a melting point of 425 degrees Fahrenheit and a density of 2.13 g / ccg (g / cubic centimeter). PCTFE is inert to most active chemicals at room temperature, but above 212T can be dissolved by a few solvents or swelled by some solvents, especially chlorinated solvent. PCTFE has excellent barrier gas ability. The water vapor permeability of its membrane products is the lowest of all transparent plastic films. Its electrical properties are similar to those of other perfluoropolymers, but the dielectric constant is 2.3-2.The knife and loss factor are slightly higher, especially at high frequency. Although PCTFE can be processed by melting, it is difficult to process because of its high melt viscosity and degradation tendency. PCTFE resin can be made into pellets for moulding and extrusion. The film is 0.001-0.010 inches thick and can be made into rods and tubes. The PCTFE resin marketed in the United States has 3Mundefineds Kel-FI, Daikinundefineds Daiflon and Allied lSignalundefineds Acfon.

    The ECTFE resin is an alternating copolymer of ethylene and chlorotrifluoroethylene at a melting point of 464 degrees Fahrenheit and a density of 1.68 g / c (g / cubic centimeter). The properties of this material from low temperature to 330T are good, and its strength, wear resistance and creep resistance are much higher than those of PTEEN FEP and PFAs. It resists most corrosive chemicals and organic solvents at room and high temperatures. Its dielectric constant is low and its performance is stable in a wide range of temperature and frequency. ECTFE can prevent flame diffusion and decompose into hard carbon when exposed to flame. ECTFE can be used for molding and extrusion of granular materials and for rotary molding, fluidized bed coating, electrostatic coating powder products. Can be used in the traditional extrusion equipment chemical foaming process into foam products, to be used in the field of computer wires. Semi-finished products have membrane, plate, tube and single fiber. Ausimont USA sells the ECTFE product brand number. In the field of wires and cables, the most important applications are used in supercharged cables, public transport vehicle cables. Fire alarm cable, anode protection cable. Injection Molding products include tower packing, pump parts, connectors, wiring columns, filter casings. ECTFE tubes with optical fibre casing, unsupported tubes, steel tubes and reinforced plastic pipes lining. ECTFE coatings and inner villages can protect metals from environmental erosion. Membrane applications rational battery and isolation applications. Single fiber applications include oil mist eliminator, braided casing, and filter fabric. The ECTFE sheet is made of glass fiber and can be used as the lining of tank with high strength and chemical resistance.

ETFE is an alternating copolymer of ethylene and tetrafluoroethylene at 1:1. The melting point of ETFE is 518F, and the density is 1.70 g / CCC. ETFE is a tough material with high impact resistance and good mechanical properties from low temperature to 356F. Chemical resistance, electrical properties and weathering resistance are similar to ECTFE and perfluoropolymer. The polymer will melt and decompose when exposed to a flame. ETFE can be made into pellets for extrusion and moulding, and powder for rotary moulding, fluidized bed and electrostatic coating. Semi-finished products have membrane, rod, tube and single fiber. The U.S. ETFE is sold by du Poutlundefineds Tefzel and Ansimont USAundefineds Hyflon and Daikinundefineds Neoflon. Applications for electric wires and cables include aircraft fishing lines, public transport vehicles and computer backplanes. Injection molding products have pumps, space and other chemical equipment components, packaging, tower packing, electrical parts.PVDF Resin.jpg

   PVDF is a high molecular weight polymer of vinylidene fluoride. It belongs to crystalline material with melting point of 338F and density of 1.78g / CC. Its strength, wear resistance and creep resistance are much higher than that of PTFEFEP and PFA; it is resistant to most chemicals and solvents, as well as oxidants such as liquid bromine and bromine salts; it has good weathering resistance and does not burn in air; Compared with other fluorine plastics, it has a high dielectric constant (8-9) and loss factor, and a good performance in the temperature range of 148 ~ 302F. PVDF can be made into powdered, granular and dispersed systems (dimethyl phthalate and diisobutyl ketone contain 44% resin). It can be extruded, injection molding, transfer molding, or through dry powder or dispersion spray technology used as paint, semi-finished film, plate, bar and single fiber. PVDE sold in the United States includes AT OChem Incundefineds Kpor Soef, Daikinundefineds Neoflon and Ansimontundefineds Hylar.

   PVF is a highly crystalline material that can only be made into a membrane. It is tough and elastic, has excellent weathering resistance, and has good performance in the temperature range of -94-230F, it has good wear resistance and stain resistance, and it can be used in plywood. Vinyl plastics are laminated with reinforced polyester and metal foils.

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