PTFE, PFA, FEP, PVDF Fluoroplastic products industry experts
Main Structure, Classification and Application of PTFE Membrane
Classification:
Industry dynamics
Author:
PFA tube little sister
Source:
Dankai
Release time:
2022-11-29
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PTFE membrane is the use of polytetrafluoroethylene dispersion resin, by premixing, extrusion, calendering, two-way stretching and other special processes to produce microporous film, divided into clothing membrane, Pu Wei waterproof membrane, filter membrane, purification membrane.
PTFE membrane is a microporous film made of polytetrafluoroethylene as raw material, using a special process, by calendering, extrusion, two-way stretching and other methods. PTFE membrane can be divided into clothing membrane, air filtration membrane,
Air purification membrane. The PTFE membrane has a fibrillar microporous structure with a porosity of more than 85%, 1.4 billion micropores per square centimeter, and a pore size ranging from 0.02 μm to 15 μm.
Main structure of PTFE membrane
1. The surface morphology of PTFE microporous membrane is a spider-like microporous structure. Pores are formed between the microfibers, and the microfiber arrangement direction is basically parallel to the stretching direction; the junction of the fiber bundle is the node,
It is formed by the entanglement of many microfibers.
2.PTFE membrane is an asymmetric membrane, and the pore size of the front and back of the membrane is different.
3. The cross-sectional micropore size of the membrane is larger than that of the surface, and the vertical and horizontal micropore sizes are also different, and the vertical micropores are larger than the horizontal.
4. The cross section of the membrane is a network structure. There are very complicated changes such as mesh connection, hole insert sleeve, hole bending and so on in the three-dimensional structure of the hole. There may be multiple micropores forming a channel, or there may be one
The micropores are connected to multiple channels.
Figure 1: PTFE membrane Source: Dankai
Classification and Application of PTFE
1. PTFE clothing film
The microporous film is made by biaxial stretching method using the pore forming characteristics of polytetrafluoroethylene plastic resin. The surface of the membrane can reach more than one billion micropores per square centimeter, and the diameter of each micropore (0.1 μm-
0.5 μm) 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), enabling water vapor to pass through while water droplets cannot pass through.
The microporous structure can achieve excellent waterproof and moisture permeable function; in addition, because the hole is extremely small and longitudinally non-standard bending arrangement, the wind cannot pass through, thus having the characteristics of windproof and warmth retention. By
After being compounded with other fabrics, it is widely used in military clothing, medical clothing, casual clothing, fire protection, anti-virus, immersion operations and other special protective clothing, outdoor sports clothing, shoes, hats, gloves and other accessories.
And sleeping bags, tents, rain gear and other materials.
2. PTFE air filter membrane
The use of PTFE microporous membrane unique node fibril, smooth surface, chemical resistance, breathable impermeable, breathable large amount of air, flame retardant, high temperature resistance, strong acid and alkali resistance, non-toxic and other characteristics, can be used for large
Gas dust removal, air purification, etc. The product made of the membrane has high filtration efficiency, up to 99.99, close to zero emissions; low operating resistance, fast filtration speed; long service life, reusable, thereby reducing
Low operating costs. Mainly used in chemical industry, iron and steel, metallurgy, carbon black, power generation, cement, waste incineration and other industrial furnace flue gas filtration. PTFE filter membrane, the pore size of the membrane can be controlled at 0.2
Between ~ 15 m, the porosity can reach more than 85%.
3. PTFE air purification membrane
Air purification membrane is based on polytetrafluoroethylene as raw material, after expansion and stretching to form a microporous film, the film with a special process coated on a variety of fabrics and substrates, a new type of filter
The membrane has a small pore size (0.05~0.45 μm), uniform distribution and large porosity. While maintaining air circulation, it can filter all dust particles, including bacteria, to achieve purification and communication.
It is widely used in pharmaceutical, biochemical, microelectronics and laboratory consumables and other fields.
This article is originally created by Teflon's little sister. Welcome to pay attention and take you to grow knowledge together!
Key words:
Ptfe, microporous, film, ptfe, structure, stretch, filter, have, windproof, warmth retention, waterproof
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