Product features:

Excellent high and low temperature resistance, can be used for a long time at -80~+250 ℃: resistant to weather aging, fire-resistant, high oxygen index, non absorbent, excellent radiation resistance. If exposed to the atmosphere for a long time, its surface and various properties remain basically unchanged; Excellent dielectric properties, high voltage resistance; Excellent corrosion resistance, almost insoluble in any solvent, will not corrode in strong acid aqua regia, strong alkali concentrated sodium hydroxide, and strong corrosive agent uranium pentafluoride; Good wear resistance, with the smallest static friction coefficient among plastics, excellent self-lubricating performance, and distinctive surface non adhesiveness; Good tensile strength. Widely used in aerospace, instrumentation, medical pharmaceuticals, electronic appliances, postal and telecommunications, petrochemicals, metallurgy and power, household appliances, lighting fixtures, etc.

Some technical requirements for data on polytetrafluoroethylene pipes:

mechanical property

Its friction coefficient is extremely small, only 1/5 of that of polyethylene, which is an important feature of perfluorocarbon surfaces. Due to the extremely low intermolecular forces between fluorine carbon chains, polytetrafluoroethylene has non adhesiveness.

Polytetrafluoroethylene maintains excellent mechanical properties over a wide temperature range of -196 to 260 ℃, and one of the characteristics of perfluorocarbon polymers is that they remain brittle at low temperatures.

Chemical corrosion resistance and weather resistance

Except for molten alkali metals, polytetrafluoroethylene is almost not corroded by any chemical reagents. For example, when boiled in concentrated sulfuric acid, nitric acid, hydrochloric acid, or even aqua regia, their weight and properties remain unchanged, and they are almost insoluble in all solvents, only slightly soluble in alkanes above 300 ℃ (about 0.1g/100g).

Polytetrafluoroethylene is non hygroscopic, non flammable, and extremely stable to oxygen and ultraviolet radiation, thus possessing excellent weather resistance.

Electrical performance

Polytetrafluoroethylene has low dielectric constant and dielectric loss over a wide frequency range, and high breakdown voltage, volume resistivity, and arc resistance.

radiation resistance

The radiation resistance of polytetrafluoroethylene is poor (104 rad), and it degrades under high-energy radiation, resulting in a significant decrease in the electrical and mechanical properties of the polymer.

Polytetrafluoroethylene is produced by free radical polymerization of tetrafluoroethylene. The polymerization reaction in industry is carried out by stirring in the presence of a large amount of water to disperse the reaction heat and facilitate temperature control. Aggregation is generally carried out at 40-80 ℃ and 3-26 kgf/cm2 pressure. Inorganic persulfates and organic peroxides can be used as initiators, or redox initiation systems can be employed. Each mole of tetrafluoroethylene releases 171.38 kJ of heat during polymerization. Dispersion polymerization requires the addition of perfluorinated surfactants, such as perfluorooctanoic acid or its salts.

The application of polytetrafluoroethylene can be formed by compression or extrusion processing; It can also be made into aqueous dispersions for coating, impregnation, or fiber production. Polytetrafluoroethylene is widely used in industries such as atomic energy, aerospace, electronics, electrical engineering, chemical engineering, machinery, instruments, meters, construction, textiles, and food as high and low temperature resistant, corrosion-resistant materials, insulation materials, and anti stick coatings.

chemical property

Corrosion resistance: able to withstand all strong acids (including aqua regia), strong oxidants, reducing agents, and various organic solvents except for molten alkali metals, fluorinated media, and sodium hydroxide above 300 ℃.

Insulation: not affected by environment and frequency, with a volume resistance of up to 1018 ohms? Centimeters, low dielectric loss, high breakdown voltage.

High and low temperature resistance: It has little effect on temperature, a wide temperature range, and can be used at temperatures ranging from -190 to 260 ℃.

Self lubrication: With the smallest friction coefficient among plastics, it is an ideal oil-free lubricating material.

Surface non adhesiveness: Known solid materials cannot adhere to the surface and are a type of solid material with the smallest surface energy.

Resistance to atmospheric aging, radiation resistance, and lower

Permeability: Long term exposure to the atmosphere maintains the surface and properties unchanged.

Non flammability: The oxygen limit index is below 90. The mechanical properties of polytetrafluoroethylene are relatively soft.