Textiles covered with “PTFE membrane” What exactly is PTFE?
PTFEmembrane is based onPolytetrafluoroethyleneis a raw material that adopts special technology and iscalendered, extrusion, biaxial stretching and other methods. PTFE membranes can be divided into workwear membranes, air filtration membranes, andair purification membranesaccording to their uses. The polytetrafluoroethylene membrane has a fibrillar microporous structure,porosity85%Above, there are 1.4 billion micropores per square centimeter, and the aperture range is 0.02mm-15mm.
Main structure
1. The surface morphology of polytetrafluoroethylene microporous film has a spider web-like microporous structure. Pores are formed between microfibers, and the arrangement direction of microfibers is basically parallel to the stretching direction; the connection of fiber bundles is the knot. Point, which is formed by many entangled microfibers.
2. Polytetrafluoroethylene membrane is an asymmetric membrane, and the micropore size is different on the front and back sides of the membrane.
3. The cross-sectional micropore size of the membrane is larger than the micropore size on its surface, and the vertical and horizontal micropore sizes are also different. The longitudinal micropores are larger than the transverse micropores.
4. The cross-section of the membrane is a network structure. The three-dimensional structure of the pores has particularly complex changes such as network connectivity, pore nesting, and channel bending. There may be multiple micropores forming a channel, or there may be one channel. Micropores are connected to multiple channels.
Classification and Application
1, Polytetrafluoroethylene work clothing film
Using the pore-forming characteristics of polytetrafluoroethylene plastic resin, a microporous film made by a biaxial stretching method. The surface of the film can reach more than one billion micropores per square centimeter, and the diameter of each micropore (0.1μm -0.5μm) is hundreds of times smaller than the diameter of water molecules (20μm-100μm) and tens of thousands of times larger than water vapor molecules (0.0003μm-0.0004μm), allowing water vapor to pass through but water droplets cannot. This micropore is used The structure can achieve excellent water-blocking and breathable functions; in addition, because of the extremely small holes and irregular longitudinal bending arrangement, wind cannot pass through, so it has the characteristics of wind resistance and warmth retention. After being laminated with other fabrics, It is widely used in military work clothes, medical work clothes, casual work clothes, special protective clothing such as fire protection, anti-virus, and water immersion operations, outdoor leisure work clothes, shoes, hats, gloves and other accessories, as well as sleeping bags, cotton tents, rain gear and other materials.
2. Polytetrafluoroethylene air filter membrane
Using the unique node fibrillarity of polytetrafluoroethylene microporous membrane, smooth surface, chemical resistance, breathable and impermeable, large air permeability, fireproof, high temperature resistance, strong acid and alkali resistance, non-toxic and other characteristics, it can be used Used in atmospheric dust removal, air purification, etc. The products made of this membrane have high filtration efficiency, up to 99.99%, close to zero emissions; low operating resistance, fast filtration speed; long service life and reusable, thus reducing operating costs. Mainly used for flue gas filtration in various industrial furnaces such as chemical industry, steel, metallurgy, carbon black, power generation, cement, waste incineration, etc. Polytetrafluoroethylene filter membrane, the pore size of the membrane can be controlled between 0.2 and 15 μm, and the porosity can be Reaching more than 85%.
3. Polytetrafluoroethylene air purification membrane
Air purification membrane is made of polytetrafluoroethylene as raw material. It is expanded and stretched to form a microporous film. This film is laminated on various fabrics and substrates using extraordinary technology to become a new type of filter. Material, the membrane has small pore size (0.05~0.45μm), uniform distribution and large porosity. While maintaining air circulation, it can filter all dust particles including bacteria to achieve the purpose of purification and ventilation. It is widely used in pharmaceuticals , biochemistry, microelectronics and laboratory consumables and other fields.
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