What are the uses of PTFE?

2022-04-09   Pageview:107

The unique properties of PTFE make it widely used in chemical, petroleum, textile, food, paper, medicine, electronics and machinery and other industrial and marine operations.

1. Application of anti-corrosion performance

Due to the defects in corrosion resistance of materials such as rubber, glass, and metal alloys, it is difficult to meet the harsh environment of temperature, pressure and chemical medium coexistence, and the resulting losses are quite alarming. PTFE material has become the main corrosion-resistant material in petroleum, chemical, textile and other industries due to its excellent corrosion resistance. Its specific applications include: conveying pipes, exhaust pipes, steam pipes for conveying corrosive gases, rolling mills, high-pressure oil pipes, high-, medium- and low-pressure pipes for aircraft hydraulic systems and cold-pressing systems, rectification towers, heat exchangers, kettles, towers, Tank lining, valves and other chemical equipment.

The performance of the seal has a great influence on the efficiency and performance of the entire machine. PTFE material has the characteristics of corrosion resistance, aging resistance, low friction coefficient and non-stickiness, wide temperature resistance range, and good elasticity, which makes it very suitable for the manufacture of seals with high corrosion resistance requirements and operating temperatures higher than 100 °C. Such as machinery, heat exchangers, high-pressure vessels, large-diameter vessels, valves, seals of grooved flanges of pumps, seals of glass reaction vessels, flat flanges, large-diameter flanges, shafts, piston rods, valve rods, Turbine pumps, tie rod seals, etc.

2. Application of low friction performance in load

Because the friction part of some equipment should not be lubricated, for example, in the case where the lubricating grease will be dissolved by the solvent and fail, or the products in the papermaking, pharmaceutical, food, textile and other industrial fields need to avoid the contamination of the lubricating oil, which makes the filled PTFE material become a The most ideal material for oil-free lubrication (direct load bearing) of mechanical equipment parts. This is because the coefficient of friction of this material is the lowest of any known solid material.

Its specific uses include bearings for chemical equipment, papermaking machinery, and agricultural machinery, as piston rings, machine tool guides, and guide rings; in civil engineering, it is widely used in bridges, tunnels, steel structure roof trusses, large chemical pipelines, and storage tanks. Support sliders, as well as bridge supports and bridge swivels.

3. Application in electronic and electrical

The inherent low loss and low dielectric constant of PTFE materials make it possible to make enameled wires for use in micro motors, thermocouples, control devices, etc; PTFE films are ideal for the manufacture of capacitors, radio insulating liners, insulating cables, motors and transformers Insulation materials are also one of the indispensable materials for industrial electronic components such as aerospace.

Oxygen sensors can be manufactured by using the selective permeability of fluoroplastic films to oxygen and low permeability to water vapor. It can manufacture microphones, speakers, parts on robots, etc.; using its low refractive index, it can manufacture optical fibers.

4, Application in medical and pharmaceutical

Expanded PTFE material is pure inert, dupont ptfe powder has very strong biological adaptability, will not cause rejection by the body, has no physiological side effects on the human body, can be sterilized by any method, and has a microporous structure, which can be used in a variety of rehabilitation solutions , including artificial blood vessels and patches for soft tissue regeneration and surgical sutures for vascular, cardiac, general and orthopaedic surgery.

5, Application of anti-stick properties

PTFE material has the smallest surface tension among solid materials, does not adhere to any substance, and also has excellent high and low temperature resistance, which makes it widely used in anti-sticking such as making non-stick pans. The anti-sticking process mainly includes two kinds: installing PTFE parts or sheets on the substrate, and wrapping the PTFE coating or varnished cloth with glass on the substrate through heat shrinkage.

With the continuous development of material application technology, the three major shortcomings of PTFE materials: cold flow, difficult to weld, and difficult to melt processability are gradually being overcome, so that it is used in optics, electronics, medicine, petrochemical oil transportation and anti-seepage. The application prospects in various fields are broader.

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