According to the manuscript report of the New Materials Research Society, my country is one of the countries that researched and produced polytetrafluoroethylene earlier, but in the past it mainly used foreign technology for some simple processing, and the research was not deep enough, and the overall production level and process technology were not high.

After years of accumulation and development, especially in the past ten years, my country's fluorine chemical technology level has developed rapidly. At present, there are 14 domestic enterprises producing PTFE, including Dongyue, Chenguang, Sanafu, Juhua, and Meilan, 5 of which have a production capacity of more than 10,000 tons. Since the properties of PTFE are so special, where is it usually used?

01. Application of PTFE in anticorrosion

Because of its excellent corrosion resistance, PTFE has been widely used in petroleum, textile and other industries. Typical examples are exhaust pipes, steam pipes, high, medium and low pressure pipes, valves, etc. Especially under harsh environmental conditions where conventional materials such as low temperature and anti-sticking cannot be used, it embodies the advantages of PTFE.

02. Application of PTFE in masks

While melt blown cloth manufacturers are still struggling to find solutions that pass FFP2 and ffp3 tests, another product that can replace melt blown cloth was born, that is, polytetrafluoroethylene (PTFE) nanocomposite membrane.

The filtration mechanism of PTFE nano filter material is pure physical filtration, which will not reduce the long-term storage efficiency, and is safe and reliable; after boiling in boiling water or alcohol disinfection and sterilization, the efficiency will not be reduced, and it can be reused.

03. Application of PTFE in the fields of electronics and power

Polytetrafluoroethylene has a small dielectric constant and can be used to prepare enameled wires for micro-motors. In addition, the fluoroplastic film has a certain selective permeability to various gases and can be used to prepare oxygen sensors.

In addition, combined with the polar charge excursion characteristics of fluoroplastics under specific conditions, it can be used to make speakers, equipment parts, etc.

PTFE not only has excellent dielectric properties that are not affected by temperature and frequency, but also has high thermal stability, so it has become an irreplaceable electrical insulating material, especially in high-frequency, high-temperature, and humid environments .

Nowadays, various forms of PTFE materials play an important role in the fields of electronics and electrical insulation. Polytetrafluoroethylene varnished glass cloth and glass cloth are used to make high-temperature and high-frequency insulating materials, which can be used in satellite communications, computers, etc.; PTFE film is used to make capacitors as insulating layers, gaskets and cables between instruments; different diameters The thin-walled PTFE tube is used for outlet bushings, heat shrinkable tubes, spiral tubes, generator insulated water pipes, etc.

04. Application of PTFE in the field of medicine

Because PTFE can reflect a certain degree of biological inertia, it has excellent pore-forming ability after standardized treatment, and can be used to prepare devices that do not cause body rejection, and to develop devices that are in deep contact with blood, and will not have a negative impact on blood.

Expanded polytetrafluoroethylene material is pure inert in nature, which has great benefits for its biological adaptability. It will not lead to rejection. It can be disinfected in a variety of ways. In addition, it covers a microporous structure and is non-hydrophilic, generally does not cause blood clogging, and can play an anti-thrombotic effect.

Such blood vessels allow cells to enter smoothly and form an intima with nearby tissues. Therefore, the sterilization operation is relatively simple, which provides a certain degree of convenience for wound suture. After long-term use, there will be no cracking or collapse.

Expanded polytetrafluoroethylene is also a very important part of the gastroscopic forceps catheter, because its deformation characteristics are very ideal. When used in the human body, it will not produce any foreign body reaction. Various operations, such as gastric sampling and polypectomy, greatly reduce the difficulty of the operation and alleviate the pain of the patient during the operation.

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In addition, the material can be used to prepare heart repair membranes, which can better repair diaphragm defects and standardize the plastic treatment of arterial stenosis. In addition, it can support a variety of rehabilitation solutions, including artificial blood vessels, blood vessels and surgery.

05. Application of anti-adhesion properties of PTFE

PTFE has low surface tension and does not adhere to other substances. Can show resistance to high and low temperature characteristics. It has very ideal applicability in the anti-sticking of non-stick pans. In addition, the anti-sticking process usually includes two types: one is to assemble the PTFE parts on the substrate; the other is that the PTFE coating is heat-shrinked and then placed on the substrate according to relevant specifications.

06. Application of PTFE in high temperature dust removal

The dust removal index set earlier in my country is relatively low, and the dust emission concentration is about 400mg/Nm3, which does not meet the requirements of dust emission concentration not exceeding 50mg/Nm3 and PM2.5 (diameter not exceeding 2.5) μ m reduction, which is for dust pollution control The industry has formed good development opportunities. The development of filter media with longer service life and higher purification efficiency has gradually become a major development trend.

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On the other hand, most industries have put forward stricter requirements on the main components of dust removal devices, especially in the fields of industrial waste incineration and power generation. Its relatively harsh environment puts forward new requirements on materials.

07. Application of polytetrafluoroethylene in construction

PTFE membrane structure is a new type of building structure. It integrates architecture, structural mechanics, fine chemicals, materials science, and computer technology.

By coating the ultrafine glass fiber fabric with PTFE resin, the PTFE membrane has the advantages of light weight, high strength, fire and flame retardant, good self-cleaning, no ultraviolet radiation, fatigue resistance, deformation resistance, aging resistance, long service life, and transparency. The characteristics of high luminous efficiency and low heat absorption. It is precisely because of the invention of this trans-epoch membrane material that membrane structure buildings have become modern buildings.

08. Application of low friction performance of PTFE in load

Due to its relatively low coefficient of friction compared with most solid materials, filled PTFE has gradually developed into an excellent material for oil-free lubrication in various parts. Widely used in chemical equipment bearings, piston rings, steel roof support sliding blocks, bridge swivels, etc.

Polytetrafluoroethylene is widely used. Because of its peculiar physical properties, it is widely loved by all walks of life.

With the rapid development of modern science and technology, PTFE materials also show three shortcomings that cannot be ignored: poor cold fluidity, welding difficulties, and melting difficulties. These problems are gradually being solved, making it have good application potential in the fields of optics and medicine.