teflon fibre The fiber strength is 1.37cN/dtex, the melting point is about 327 ° C, the limiting oxygen index is 95%, the friction coefficient is about 0.2, and the water contact angle of the fiber is about 120 °. Currently, it is mainly used in the following aspects.

(1) Application in filter materials

The bag filter developed with polytetrafluoroethylene short fiber has excellent temperature resistance, strong acid and alkali resistance and good oxidation resistance. Therefore, it can be used as a filter for high temperature and humidity dust and corrosion resistant gas. It has good characteristics of low friction, smooth surface, easy dust removal, and low running resistance. It has good flame retardancy, insulation and heat insulation, and long service life, teflon Filament is made by twisting, warping and weaving into polytetrafluoroethylene fiber mesh and ion exchange membrane made of composite sulfonic acid resin, which is the key element of chlor alkali project. PTFE fiber and microporous membrane also have great potential in water treatment, especially for difficult problems, such as the treatment of mercerizing wastewater and waste leachate in printing and dyeing wastewater

(2) Application in aerospace and personal protection

The spacesuit is usually composed of underwear, ventilation layer, thermal insulation layer, air tight limit layer, water-cooled clothing, thermal insulation clothing and tear resistant layer. The limiting layer is made of polyamide fiber, polytetrafluoroethylene fiber or aromatic polyamide fiber. The main materials of tear resistant layer are synthetic fibers, such as aramid and PTFE fiber fabrics.  

(3) Application in architecture

Polytetrafluoroethylene woven fabric is used as the basic fabric, and the surface is compounded with the polytetrafluoroethylene membrane to prepare membrane building materials. It has good light transmittance, can reduce the cost of lighting and air conditioning, has good aging resistance, and low friction coefficient. The construction period of the roof can be shortened by 50%. It is light in weight, earthquake resistant, nonflammable, and has great design freedom. Therefore, it can be used as roof material for outdoor stadiums, arenas, gymnasiums, skating rinks, swimming pools, large exhibitions, etc.

(4) Application in the field of self lubrication

The friction coefficient of PTFE fiber is very low. It is made by weaving and dipping fabric self-lubricating pad in phenolic resin, epoxy resin and other resins. During heavy load wear, a polytetrafluoroethylene transfer film is formed between the contact surface of the inner ring and outer ring of the spherical sliding bearing, which significantly reduces the friction coefficient between the inner ring and outer ring of the bearing and extends the service life of the bearing. Lubricate the spherical plain bearing. The sliding bearing containing polytetrafluoroethylene fiber or fabric has the characteristics of non lubrication, durability, strong adaptability to the environment, etc. It is widely used in heavy load, maintenance free, small and lightweight industrial fields. PTFE fiber bearings used in food processing machinery can largely ensure food hygiene and eliminate lubricant pollution.