Uses of PTFE in all aspects

Application in filter materials

PTFE fiber has important applications in filter cloth, and its comprehensive performance is better than other high-performance fiber materials. At present, the main purpose of PTFE fiber is to make filter material for high temperature and corrosion resistant flue gas dust removal. PTFE short fibers can be used to make needle-punched felts for filtration, and long fibers can be used to make scrims of needle-punched felts. Because of their long service life, they can be used not only for the base fabrics of PTFE felts, but also for other types of high-performance Felt base fabric made of fibers. PTFE sewing thread can be used in the manufacture of various types of filters. As a filter material, it can be purely spun or mixed with other fibers. These products are mainly used in hazardous solid waste incinerators (garbage incinerators), cement, power station coal-fired boilers, glass, non-ferrous smelting, chemical production exhaust and flue gas dust removal, etc. PTFE fiber filter cloth can also be used as a filter material for high temperature and corrosive liquids.

Application in medical and health

Because the expanded PTFE material is purely inert, has no toxicity, has very strong biological adaptability, will not cause rejection of the body, has no physiological side effects on the human body, can be disinfected by any method, has a microporous structure, and can be used for In a variety of rehabilitation programs, such as artificial blood vessels and patches for soft tissue regeneration, surgical sutures for blood vessels, heart and liver, general surgery and plastic surgery, its excellent antimicrobial, antibacterial, long flexion life and zero regain rate, etc. The advantages make people continue to develop the application of PTFE fiber in this field. Dental floss made of the high-strength properties of PTFE fiber can slide freely between teeth without breaking. The clinical effect of the dental floss has been certified by the American Dental Organization and the British Dental Organization. DuPont's PTFE fiber can be used as the main component to make up or replace the heart valve. The PTFE fiber knitted fabric loop is wrapped around the heart valve during the operation. Because of the superior fluid sealing characteristics of the fiber, it plays a role in making up or replacing the heart valve.

Applications in aerospace

Space suits are the most demanding protective suits today, and their main function is to protect astronauts from heat, cold, chemicals, micrometeoroids, pressure waves and other hazards. A space suit is generally composed of underwear, a ventilation layer, a warmth-keeping layer, an air-tight restriction layer, a water-cooled suit, a heat-insulating suit, and an anti-tear layer. The structure of the airtight restriction layer is divided into two levels: airtight and restriction, which are combined by local bonding technology. The airtight layer is made of nylon base cloth coated with polyurethane or neoprene, which has the advantages of pressure resistance, good air tightness, aging resistance and light weight. The restriction layer adopts polyamide fiber, polytetrafluoroethylene fiber or aramid fiber. The main material of the anti-tear layer is synthetic fiber, such as aramid and PTFE fiber fabric. The tear-resistant layer of NASA's spacesuit is a fabric made of Nomex and PTFE fibers interwoven, and Kevlar is used as a protective yarn. The wear-resistant reinforced material made of PTFE fiber is a structural material for making airplanes and other aircraft. The bushing is an important part of the aircraft landing gear. The excellent performance of the PTFE fiber fabric bushing enables it to meet the working requirements of the aircraft landing gear. PTFE fiber can also be used to make shields such as rocket launch pads.

Application in construction

A 100% base fabric woven from PTFE fibers, and a PTFE film on its surface can be used to make architectural films. This kind of membrane structure building material has good light transmittance and self-cleaning, which can reduce the cost of lighting and air conditioning. It has a durability of more than 20 years. It can reduce the cost of painting and cleaning. It can reduce 50% of the roof material cost and 20% of the total construction cost. It has the advantages of light weight, shock resistance, non-combustibility, and high design freedom. Therefore, it can be used as roof material for outdoor stadiums, arenas, gymnasiums, swimming pools, large-scale exhibitions, etc.

Application in the chemical and mechanical industries

PTFE fiber has a small coefficient of dynamic friction and is processed into packing with abrasion resistance. It can be directly used for the rotating shaft of valves, centrifugal pumps, mixers and agitators (propellers, etc.). The acid and alkali resistance, low abrasion and non-combustibility of PTFE fiber make it suitable for protective clothing in the chemical industry. The ion exchange membrane made of PTFE long fiber and composite sulfonic acid resin is an indispensable key component of chlor-alkali engineering. Ion exchange fibers made of PTFE grafted acrylic acid, sodium styrene sulfonate, etc., can be used for heavy metal recovery, catalyst support, etc.