What Is The Textile Covered PTFE Film PTFE?

Abstract: PTFE membrane is a microporous membrane made of polytetrafluoroethylene as a raw material and processed by calendering, extrusion and biaxial stretching. PTFE membranes can be classified into garment membranes, air filtration membranes, and air purification membranes according to their use. The PTFE membrane has a fibrillar microporous structure with a porosity of 85% or more, 1.4 billion micropores per square centimeter, and a pore diameter ranging from 0.02 mm to 15 mm. Main structure PTFE microporous film surface morphology is

The PTFE membrane is a microporous membrane made of polytetrafluoroethylene as a raw material and processed by calendering, extrusion, biaxial stretching and the like by a special process. PTFE membranes can be classified into garment membranes, air filtration membranes, and air purification membranes according to their use. The PTFE membrane has a fibrillar microporous structure with a porosity of 85% or more, 1.4 billion micropores per square centimeter, and a pore diameter ranging from 0.02 mm to 15 mm.

The main structure

1. The surface morphology of the PTFE microporous membrane is a microporous structure with a spider web. The pores are formed between the microfibers, and the microfibers are arranged in a direction substantially parallel to the stretching direction; the junction of the fiber bundles is a junction, which is formed by entanglement of a plurality of microfibers.

2. The PTFE membrane belongs to an asymmetric membrane, and the pore size of the front and back of the membrane varies.

3. The cross-sectional pore size of the membrane is larger than the pore size of the surface, and the size of the vertical and horizontal micropores is also different, and the longitudinal micropores are larger than the transverse direction.

4. The cross section of the membrane is a network structure. There are very complicated changes in the three-dimensional structure of the pores, such as mesh communication, hole inlay, and channel bending. There may be a plurality of micropores to form a channel, or a micropore and Multiple channels are connected.

Classification and application

1, PTFE clothing film

A microporous film made by a biaxial stretching method using a pore-forming property of a polytetrafluoroethylene plastic resin. The surface of the membrane can reach more than one billion micropores per square centimeter, each micropore diameter (0.1μm-0.5μm) is several hundred times smaller than the water molecule diameter (20μm-100μm), compared with water vapor molecules (0.0003μm-0.0004). Μm) is tens of thousands of times, so that water vapor can pass, and water droplets cannot pass. This microporous structure can achieve excellent waterproof and moisture permeable function; in addition, because the hole is extremely small and the longitudinal non-standard curved arrangement makes the wind unable to Through, it has the characteristics of wind resistance and warmth. After being combined with other fabrics, it is widely used in military clothing, medical clothing, casual wear, fire protection, anti-virus, water-immersion operations and other special protective clothing, outdoor sports clothing, shoes, hats, gloves and other accessories as well as sleeping bags, tents, rain gear and other materials.

2, PTFE air filter membrane

The unique node of polytetrafluoroethylene microporous membrane can be used for atmospheric dust removal, such as fibril, smooth surface, chemical resistance, gas permeable, water permeable, flame retardant, high temperature resistant, strong acid and alkali resistant, non-toxic and other characteristics. , air purification, etc. The product made by the membrane has high filtration efficiency, up to 99.99%, close to zero emission; low running resistance, fast filtration speed; long service life and reusable, thus reducing operating costs. It is mainly used for flue gas filtration of various industrial furnaces such as chemical, steel, metallurgy, carbon black, power generation, cement, and garbage incineration. The PTFE filter membrane has a pore size of 0.2 to 15 μm and a void ratio of 85% or more.

3, PTFE air purification film

The air purification membrane is made of polytetrafluoroethylene as a raw material, and after being expanded and stretched to form a microporous film, the film is coated on various fabrics and substrates by a special process to become a novel filter material. The membrane has a small pore size (0.05-0.45μm), uniform distribution and large porosity. It can filter all dust particles including bacteria while maintaining air circulation, and it can be used for purification and ventilation. It is widely used in pharmaceutical, biochemical, Microelectronics and laboratory consumables.