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The teflon film (PTFE) characteristics and Application

2014/1/31      view:

The teflon film (PTFE) characteristics and Application

The teflon film (PTFE) is composed of PTFE resin molding, sintering, cooling into blank, then through cutting, rolling into. The film is not turning into the orientation film, non directional film after pressure by the orientation film. Non directional film calender is 1.1-1.8 times as much as half the orientation film.

The teflon film (PTFE) performance characteristics

The teflon film (PTFE) is composed of tetrafluoroethylene monomer polymerization of polymer, is a waxy substance similar to a PE transparent or opaque, its density is 2.2g/cm3, bibulous rate is less than 0.01%. Its chemical structure is similar with PE, but all of hydrogen atoms in polyethylene are replaced by fluorine atoms. Because the C-F bond energy is high, stable performance, so the corrosion resistance is excellent, can withstand except molten alkali metals fluoride medium, etc..

All acid addition is higher than 300 ℃ (including sodium hydroxide aqua regia), and strong oxidizing agent, the reducing agent and solvent effect; PTFE molecules in F atomic symmetry, two kinds of elements in C-F bond by covalent bond, no free electrons in molecules, the molecule is neutral, so it has electrical properties dielectric excellent electrical insulation, but the effect is not affected by the environment and the frequency of the. The volume resistance which is more than 1017, small dielectric loss, high breakdown voltage, arc resistance is good, can work in the electrical environment 250 ℃ long; because there is no hydrogen bond in the molecular structure of PTFE, the structure is symmetrical, so it's a high degree of crystallinity (general crystallinity of 55%~75%, sometimes as high as 94%), the PTFE heat resistant performance is excellent, its melting temperature is 324 ℃, decomposition temperature is 415 ℃, the highest temperature is 250 ℃, the brittle transition temperature of -190 ℃, heat deformation temperature (0.46MPa condition) is 120 ℃. The mechanical properties of PTFE, the tensile strength was 21~28MPa, flexural strength was 11~14MPa, elongation of 250%~300%, the static friction coefficient of steel is 0.04, the coefficient of friction than nylon, POM, polyester, plastic are small.

Pure PTFE film (PTFE) of low strength, poor wear resistance and creep resistance is not good, often to add some inorganic particles in the PTFE polymer, such as graphite, molybdenum disulfide, three oxidation of two aluminum, glass fiber, carbon fiber to improve the mechanical properties; also can be used with other polymers such as poly ester (PHB), polyphenylene sulfide (PPS), polyether ether ketone (PEEK), poly perfluoro (ethylene / propylene copolymer (PFEP) blends) method to the damping temperature range, improve the creep resistance.