PTFE Lined Autoclave

PTFE Lined Autoclave is a product that combines the advantages of PTFE material and high-pressure kettle equipment. Polytetrafluoroethylene is a highly corrosion-resistant material with extremely low friction coefficient and high chemical stability. Applying polytetrafluoroethylene material to the inner lining of high-pressure vessels can improve the corrosion resistance and chemical resistance inside the vessel, ensuring that chemical substances are not contaminated during the experimental process.

The structure of a polytetrafluoroethylene lined high-pressure kettle is similar to that of an ordinary high-pressure kettle, mainly consisting of two components: the kettle body and the kettle cover. The interior of the kettle is equipped with a polytetrafluoroethylene lining, which can resist the erosion of various chemicals and ensure that the chemicals inside the kettle are not contaminated. The kettle cover is equipped with a safety valve and pressure gauge, which can monitor the pressure inside the kettle in real time to ensure the safety of the experiment. In addition, the kettle body is also equipped with a heating sleeve and stirrer, which can facilitate heating and stirring operations.

PTFE polytetrafluoroethylene is a high-performance multifunctional fluoropolymer composed of carbon and fluorine atoms. Fluorinated polymers are a group of plastics with a wide range of characteristics and advantages. PTFE is such a fluoropolymer, and its discovery has forever reformed the fluoropolymer group and paved the way for various applications. Polytetrafluoroethylene is a thermoplastic polymer that is a fluoropolymer composed of carbon and fluorine atoms. Polytetrafluoroethylene is toxic to human health because it contains a carcinogen called PFOA.

However, there is no need to worry, as PTFE non stick coatings no longer contain this substance. PTFE pipes are most commonly used as laboratory pipes, with chemical resistance and purity being the most important. Polytetrafluoroethylene has an extremely low coefficient of friction and is known as one of the most "slippery" substances. PTFE sheets are used for various applications, such as PTFE encapsulated gaskets and PTFE packing. It has excellent resistance to gases, water, chemicals, fuel, and oil.

One of the common applications of PTFE materials includes non stick coatings for kitchen utensils. Due to its non reactivity, partly due to the strength of carbon fluorine bonds, it is commonly used in pipelines and containers for manufacturing reactive and corrosive chemicals.
How is polytetrafluoroethylene made?
The manufacturing of PTFE is very similar to any other polymer. It is manufactured through free radical polymerization technology using TFE addition polymerization in an intermittent process in an aqueous medium.
The chemical structure of PTFE is the same as that of polyethylene; The only major difference is that the hydrogen atom is completely replaced by fluorine. However, the preparation methods of PE and PTFE are completely different.
The size of fluorine atoms is enormous, forming a uniform and continuous sheath around the carbon carbon bond, providing molecules with good chemical resistance, electrical inertness, and stability.

Other notable features of PTFE include excellent high and low temperature resistance, electrical insulation performance, chemical inertness, low friction coefficient (static 0.08 and dynamic 0.01), and non adhesion over a wide temperature range (-260 to 260 ° C).
◆ In terms of chemical resistance, PTFE is one of the most reliable materials. It will only be corroded by molten alkali metals, organic halides such as chlorine trifluoride (ClF3) and oxygen difluoride (OF2), as well as gaseous fluorine at high temperatures.
◆ The mechanical properties of PTFE are also impressive, but it is not as good as other engineering plastics at room temperature. Adding fillers has been proven to be a successful method to overcome this obstacle. Within its normal temperature range, PTFE exhibits some useful mechanical properties. These properties are also hindered by processing variables such as sintering temperature, preform pressure, and cooling rate. Polymer properties such as molar mass particle size and particle size distribution can have a negative impact on mechanical properties.
◆ Polytetrafluoroethylene has outstanding electrical insulation performance, low dielectric constant, and insulation withstand voltage. The very low dielectric constant (2.0) is the result of the complex symmetric structure of large molecules.
◆ PTFE material also exhibits good thermal performance, with no significant degradation below 440 ° C.
It will also be attacked by air degradation and radiation, starting at a dose of 0.02 Mrad.

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The following table shows the specific performance and value of PTFE:

Characteristics and properties of polytetrafluoroethylene
PTFE mainly comes in three forms - particles, water-based dispersions, and fine powders.
◆ Granular PTFE materials are produced by suspension polymerization using a small amount or no dispersant in an aqueous medium. Granular polytetrafluoroethylene materials are mainly used for compression, isostatic pressing, and plunger extrusion methods.
◆ The water-based PTFE dispersion uses the same water-based polymerization method, with more dispersants and stirring. Water-based dispersions are mainly used in coatings and film casting methods.
◆ Fine powder PTFE is a small white particle made by controlled lotion polymerization. Fine polytetrafluoroethylene powder can be processed into thin sheets through paste extrusion or additives to improve wear resistance.

The importance of fillers and additives for PTFE:

Adding fillers and additives can significantly improve the mechanical properties of PTFE, especially creep and wear rates. Commonly used fillers include steel, carbon, fiberglass, carbon fiber, graphite, bronze, steel, etc.

◆ Glass fiber: Its addition will improve the creep performance and wear properties of PTFE by affecting its low and high temperatures. In addition, glass filled compounds perform exceptionally well in oxidizing environments.

◆ Carbon fiber: Carbon fiber is crucial for reducing creep, improving hardness, and increasing flexibility and compression modulus. Polytetrafluoroethylene mixed with carbon fiber compounds has high thermal conductivity and low coefficient of thermal expansion. Carbon fiber is inert to strong alkalis and hydrofluoric acid (glass fiber can withstand these two acids). These parts are very suitable for manufacturing automotive parts such as shock absorbers.

◆ Carbon: Carbon as an additive will help reduce creep, increase hardness, and improve the thermal conductivity of PTFE. By mixing PTFE and graphite and improving the wear resistance of carbon filled compounds, the same results can also be obtained. These mixtures are very suitable for non lubricating applications, such as piston rings in compression cylinders.

◆ PTFE filled with bronze: This compound has excellent thermal conductivity and conductivity, making it very suitable for applications that withstand extreme loads and temperatures.

Advantages of adding fillers:

◆ Fillers/additives are crucial for increasing the porosity of PTFE compounds, thus affecting their electrical properties - they reduce dielectric strength while increasing dielectric constant and dissipation factor.

◆ Fillers can significantly improve the performance of PTFE at high and low temperatures.

◆ The changes in chemical properties largely depend on the type of additive used, however. Generally speaking, it also leaves positive results.

The best technology for processing PTFE:

◆ The rigid polymer chain structure of PTFE makes it extremely difficult to process, such as traditional methods such as injection molding and extrusion. Nevertheless, its extremely high melt viscosity and high melting temperature are of no use. The ideal processing technology for powder metallurgy is very suitable for PTFE.

◆ Sintering, compression molding, pressing, stamping or paste extrusion, hot stamping, machining, and extrusion of pre sintered powder on specialized machines.

◆ Paste extrusion mixes PTFE with hydrocarbons to create insulation layers for tapes, pipes, and wires. Hydrocarbons will evaporate before the parts are sintered.

◆ Working temperature range: -200 ° C to 260 ° C.