Product characteristics of polytetrafluoroethylene (PTFE tube)
Has excellent chemical stability (corrosion resistance, aging resistance, wear resistance, high-temperature resistance, low-temperature performance)
Has the very high heat resistance, the cold resistance
Low coefficient of friction
Use of polytetrafluoroethylene (PTFE tube)
Polytetrafluoroethylene is widely used as high and low temperature resistant, corrosion-resistant, insulating, and anti-adhesion coating materials in atomic energy, aerospace, electronic, electrical, chemical, mechanical, instrumentation, construction, textile, food, and other industries.
The polytetrafluoroethylene has excellent high temperature, low-temperature performance, can be used In-80 ~ + 250 °C for a long time: weather aging resistance, fire resistance, otherwise, high oxygen index, non-absorbent, radiation resistance, such as long-term exposure in the atmosphere, excellent dielectric properties, high voltage resistance, excellent corrosion resistance, almost insoluble in any solvent, in solid acid aqua regia, strong alkali sodium hydroxide, strong corrosive agent Uranium pentafluoride will not corrode; Good wear resistance, the static friction coefficient is the little plastic, excellent self-lubricating performance, a unique surface non-viscous; good tensile strength.
Some data technical requirements for polytetrafluoroethylene tube -PTFE PTFE tube)
Its friction coefficient is only 1/5 of polyethylene, which is an essential feature of perfluorocarbon surfaces. And because the fluorine-carbon chain is intermolecular force, the polytetrafluoroethylene is non-stick.
The polytetrafluoroethylene maintains excellent mechanical properties over a wide temperature range from-196 °C to 260 °C. One of the characteristics of perfluorocarbon polymers is that they remain brittle at low temperatures.
Chemical resistance and weatherability the polytetrafluoroethylene is almost resistant to any chemical agent except molten alkali. For example, in concentrated sulfuric acid, nitric acid, hydrochloric acid, or even boiled in aqua regia, their weight and properties remain unchanged. They are almost insoluble in all solvents and only slightly soluble in total alkanes (about 0.1 g/100g) above 300 °C. Polytetrafluoroethylene non-moisture, non-flammable, oxygen, UV are incredibly stable, so it has excellent weather resistance.
The polytetrafluoroethylene has a low dielectric constant and low dielectric loss over a wide frequency range, and a high breakdown voltage, volume resistivity, and arc resistance.
The radiation resistance of the polytetrafluoroethylene is poor (104 rads), which is degraded by high energy radiation, and the electrical and mechanical properties of the polymer are decreased.
Polytetrafluoroethylene is produced by free-radical polymerization of tetrafluoroethene. Industrial polymerization is carried out by stirring in large amounts of water to disperse the reaction heat and facilitate temperature control. Polymerization is generally carried out at 40 ~ 80 °C under the pressure of 3 ~ 26 kg/CM2, using inorganic persulfate and organic peroxide as initiators or redox initiators. 171.38 kj per mole of tetrafluoroethene. Dispersion polymerization requires the addition of perfluorinated Surfactants, such as perfluorooctanoic acid or its salts.
The polytetrafluoroethylene may be compressed or extruded into shapes; it may also be made into aqueous dispersions for coating, impregnation, or fiber formation. Polytetrafluoroethylene is widely used as high and low temperature resistant, corrosion-resistant, insulating, and anti-adhesion coating materials in atomic energy, aerospace, electronic, electrical, chemical, mechanical, instrumentation, construction, textile, food, and other industries.
Polytetrafluoroethylene (PTFE) chemical property
Corrosion Resistance: withstand all strong acids (including aqua regia), strong oxidants, reducing agents, and various organic solvents except molten alkali metals, fluorinated media, and sodium hydroxide above 300 °C.
Insulation: volume resistance up to 1018 ohms, independent of environment and frequency? Cm, low dielectric loss, high breakdown voltage.
High and low-temperature resistance: the temperature of the impact of the small, wide range of temperature, temperature-190 ~ 260 °C, can be used.
Self-lubrication: with the slightest friction coefficient in plastic, it is an ideal oil-free lubricating material.
Surface non-stick: known solid material can not adhere to the surface, is a surface energy minimum solid material. Atmospheric aging resistance, radiation resistance, and low permeability: long-term exposure to the atmosphere, surface, and properties remain unchanged.
Non-combustibility: oxygen limiting index below 90, the mechanical properties of the polytetrafluoroethylene are softer, low surface energy.