PTFE, PFA, FEP, PVDF Fluoroplastic products industry experts
Production Method and Application of PTFE Pipe
Classification:
Industry dynamics
Author:
PFA tube little sister
Source:
Dankai
Release time:
2022-12-06
Visits:
PTFE pipe is the use of high-quality plunger extrusion pipe, the use of special processing technology, so that the steel pipe and plastic pipe closely combined, can withstand positive pressure 1.6Mpa, negative pressure:
77Kpa; can be used normally in -60~260 degrees Celsius, with reliable and excellent corrosion resistance. Transporting strong corrosive gases and liquids at high temperatures, which other pipelines cannot
instead.
Polytetrafluoroethylene (PTFE) has excellent chemical stability, can withstand all strong acids, strong bases, strong oxidants, and does not work with various organic solvents. PTFE use temperature range
It can be applied to -180 ℃ ~ 250 ℃ for a long time under normal pressure. After being treated at 250 ℃ for 1000h, its mechanical properties change very little. PTFE has very low friction
Number, is a good antifriction, self-lubricating material, its static friction coefficient is less than the dynamic friction coefficient, so used to make bearings have the advantages of small starting resistance and smooth operation. By
PTFE is non-polar, heat-resistant and non-absorbent, so it is an excellent electrical insulation material. Also has excellent aging resistance, non-sticky and non-flammable.
Various profiles and parts made of PTFE, such as bars, pipes, films, bearings, gaskets, valves, etc., are widely used in machinery, chemical industry, aviation, electrical and electronic, national
Anti-industrial, cutting-edge technology, medical and health and electrical insulation and other fields.
Figure 1: PTFE tube Source: Dankai
The critical pressure of pure PTFE material is about 27.5MPa, and the compressive strength of PTFE material decreases with the increase of pressing pressure. Compression modulus increases with the increase of pressing pressure.
Plus. Finally, the molding pressure of PTFE was determined to be 27.5MPa. The sintering process is determined as follows: sintering temperature 380 degrees C, holding time 4h, heating rate 200 degrees C at 80 degrees C/h,
Above 200 ℃, 60 ℃/h, the cooling rate is cooling with the furnace. There are also good electrical properties, and its electrical insulation is not affected by temperature, and it is called "plastic king.
(1) The preparation of monomer tetrafluoroethylene is industrially based on trichloromethane as raw material, with anhydrous hydrofluoric acid to fluorinate trichloromethane, the reaction temperature is above 65 ℃, and antimony pentachloride is used as catalyst.
agent, and finally by thermal cracking method into tetrafluoroethylene; (also can be zinc at high temperature with tetrafluorodichloroethane to produce tetrafluoroethylene.)
(2) Preparation of polytetrafluoroethylene: in an enamel or stainless steel polymerization kettle, water is used as the medium, potassium persulfate is used as the initiator, perfluorocarbon is used as the dispersant
Stabilizer, tetrafluoroethylene is prepared by redox polymerization of polytetrafluoroethylene. Add various additives to the reaction kettle, the tetrafluoroethylene monomer enters the polymerization kettle in the gas phase, and adjusts the inside of the kettle.
Temperature to 25 DEG C, and then add a certain amount of activator (heavy sodium sulfite), through the oxidation, reduction system to initiate polymerization. During the polymerization process, monomers are continuously added to preserve
Holding the polymerization pressure of 0.49~0.78MPa, the dispersion obtained after polymerization is diluted with water to a certain concentration, and the temperature is adjusted to 15~20 ℃, after coagulation by mechanical stirring, water
Washing, drying, that is, this product is fine granular resin.
Polytetrafluoroethylene can be molded by compression or extrusion; it can also be made into an aqueous dispersion for coating, impregnation or fiber. PTFE in atomic energy, national defense, aviation
Widely used in industries such as electronics, electrical, chemical, machinery, instruments, meters, construction, textiles, metal surface treatment, pharmaceuticals, medical, textiles, food, metallurgy and smelting
Used as high and low temperature resistant, corrosion resistant materials, insulation materials, anti-sticking coating, etc., making it an irreplaceable product.
PTFE has outstanding excellent comprehensive performance, high temperature resistance, corrosion resistance, non-stick, self-lubricating, excellent dielectric properties, very low coefficient of friction. used as engineering plastics,
It can be made into PTFE tubes, rods, belts, plates, films, etc. It is generally used in corrosion-resistant pipes, containers, pumps, valves, radar and high-frequency communications with high performance requirements.
equipment, radio equipment, etc. The mechanical properties of PTFE can be greatly improved by adding any filler that can withstand the sintering temperature of PTFE, while maintaining other advantages of PTFE.
good performance. The filled varieties are glass fiber, metal, metalized oxide, graphite, molybdenum disulfide, carbon fiber, polyimide, EKONOL..., etc., wear resistance, limit
The PV value can be increased by 1000 times.
PTFE pipe is made of suspension polymerization PTFE resin by plunger extrusion processing. In the known plastic polytetrafluoroethylene has the best resistance to chemical corrosion and dielectric
Electrical properties. PTFE braided packing is a good dynamic sealing material. It is woven from expanded polytetrafluoroethylene tape and has low friction coefficient, wear resistance and chemical resistance.
Corrosion, good sealing, no hydrolysis, no hard and other excellent performance. Gasket seals and lubricating materials for working in various media, as well as electricity used at various frequencies
Insulating parts, capacitor medium, wire insulation, electrical instrument insulation, etc.
This article is originally created by Teflon's little sister. Welcome to pay attention and take you to grow knowledge together!
Key words:
PTFE, ptfe, temperature, performance, material, excellent, high and low temperature resistance, corrosion resistance, strong acid and alkali, strong oxidant, insulation
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