English
1、 Introduction to Polytetrafluoroethylene
Polytetrafluoroethylene (PTFE), commonly known as the "plastic king", is a polymer made by polymerizing tetrafluoroethylene as a monomer. White wax like, semi transparent, excellent heat and cold resistance, can be used for a long time at -180~260 º C. Also known as: PTFE, F4, PTFE, PTFE, Teflon, Teflon, Teflon, Teflon, Teflon PTFE、 Plastic King.
2、 Introduction to Polytetrafluoroethylene Membrane
Also known as PTFE film, F4 film, PTFE film, PTFE film, PTFE film, PTFE film, PTFE film, PTFE film, PTFE film, PTFE king film.
2.1 Characteristics of PTFE film: PTFE film is made by molding, sintering, cooling suspended PTFE resin into a blank, and then turning and rolling it. The film formed by turning is an oriented film, which becomes an oriented film after being pressed and delayed. Non directional film rolling 1.1-1 After 8 times, it becomes a semi oriented film. Polytetrafluoroethylene film is used as a dielectric for capacitors, for wire insulation, electrical instrument insulation, and sealing gaskets. PTFE film is divided into PTFE colored film, PTFE activated film, and F46 (FEP) film.
2.2 Model and specification of polytetrafluoroethylene film
Figure 1 Specification of PTFE film
3、 Common problems with polytetrafluoroethylene film
3.1 Is PTFE membrane an organic membrane
There is c in the chemical formula, but it is not necessarily an organic compound, because there is also c in CO2, but CO2 is the final product of organic combustion. CO2 cannot be burned, but polytetrafluoroethylene can react with O2 under certain conditions, and the final product is CO2, so it must be an organic compound. Polytetrafluoroethylene membrane is an organic material and membrane.
3.2 How high temperature can PTFE film withstand
Polytetrafluoroethylene film maintains excellent mechanical properties over a wide temperature range of -196 to 260 ℃, and one of the characteristics of perfluorocarbon polymers is that they remain brittle at low temperatures.
3.3 PTFE film mask
Polytetrafluoroethylene mask membrane has high porosity, strong hydrophobicity, good adsorption performance, efficient removal rate, and high flow rate. The aperture size can intercept large particles in the air, utilize electrostatic effects to adsorb PM2.5, effectively block PM2.5 in the air, and effectively reduce the concentration of bacteria and viruses in the air, resulting in a longer service life. The mask made with it can better block fine dust from entering the filter material, like an artificial initial layer of dust, achieving surface filtration and achieving a dust removal efficiency of 99.9%~99.999%. It even has a high dust removal efficiency for fine particles of PM2.5~PM10, achieving a level close to "zero emissions".
3.4 Polytetrafluoroethylene membrane manufacturers
3.5 PTFE microporous filter membrane
Expanded microporous membrane is produced using advanced biaxial stretching technology, with a unique microporous structure composed of billions of continuous interconnected fibers arranged in a non concentric cross pattern.
Characteristics: Breathable and impermeable, high air permeability, low resistance, high particle retention rate, good temperature resistance, resistance to strong acids, alkalis, organic solvents, and oxidants, aging resistance, non stick, non flammable, non-toxic, and biocompatible.
Applications: pharmaceuticals, electronics, chemicals, food, cement, metallurgy, energy, clothing, etc.
3.6 Polytetrafluoroethylene hollow fiber membrane
Hollow fiber membrane is a self-supporting membrane with a fibrous appearance. It is a type of asymmetric membrane, and its dense layer can be located on the outer surface of fibers, such as reverse osmosis membranes, or on the inner surface of fibers, such as microfiltration membranes, nanofiltration membranes, and ultrafiltration membranes. The membrane wall is covered with micropores, which are expressed in terms of the molecular weight that can intercept substances. The intercepted molecular weight can reach several thousand to several hundred thousand. The raw water flows under pressure outside or inside the hollow fiber membrane, forming external pressure and internal pressure, respectively.
3.7 Standard for polytetrafluoroethylene film
Standard No.: QB/T 4876-2015 This standard applies to non oriented polytetrafluoroethylene films made by turning raw materials formed by compression molding, as well as semi oriented and oriented films made by re rolling non oriented films
Figure 2 Polytetrafluoroethylene film
4、 Process flow of polytetrafluoroethylene film
Production process of polytetrafluoroethylene film:
PTFE resin and pigment → mixing → compression molding → sintering → cooling → turning non oriented film → rolling semi oriented film.
Main process parameters:
Mixing: Currently, there are two main ways to mix colored PTFE films produced; Dry mixing and wet mixing. Research has shown that wet mixing is more efficient than dry mixing, but it involves more processes and higher costs, requiring the addition of solvents. To ensure the uniformity of the product, wet mixing is generally used.
The process involves adding solvents to PTFE resin and pigments, mixing, drying, removing solvents, and coloring materials.
5、 The use of polytetrafluoroethylene film
5.1 What products are polytetrafluoroethylene films used in
Mainly used as capacitor dielectric, for wire insulation, electrical instrument insulation, sealing gasket, etc. Color powder, copper powder, graphite, polystyrene, and other materials can also be filled into polytetrafluoroethylene wool to create turning films with different colors or improved hardness, temperature resistance, wear resistance, and other properties. It can also be used in air filtration membranes, waterproof and breathable microporous membranes, and polytetrafluoroethylene bubble point membranes.
5.2 Application of polytetrafluoroethylene film
Polytetrafluoroethylene film is suitable for use as an insulation layer for capacitors, special cables, wire insulation, electrical instrument insulation, and sealing gaskets. It can also be used as a non stick tape, sealing tape, demolding, and insulation material. Widely used in light industry, military industry, aerospace, oil fields and other fields.
With the continuous development of material application technology, the three major disadvantages of polytetrafluoroethylene film (PTFE) materials, namely cold flowability, difficult weldability, and difficult to melt processing, are gradually being overcome, making its application prospects in various fields such as optics, electronics, medicine, petroleum and chemical oil transportation anti-seepage even broader.
