PTFE is so widely used that it really deserves to be the "king of plastics"!

Polytetrafluoroethylene (PTFE) is one of the most widely used fluoropolymers. It is the most chemically resistant plastic, has the best dielectric properties and a wide operating temperature range. It is known as "the king of plastics".

PTFE has high temperature resistance (can be used in the temperature range of 200~260℃ for a long time), low temperature resistance (can be used for a long time below -100℃), corrosion resistance (with extremely high chemical inertness), weather resistance (extremely high resistance to Atmospheric aging performance), high lubrication (with a very small coefficient of friction), non-adhesion (very low surface tension, not easy to adhere), good compatibility with human bodies (with good physiological inertia, non-toxic), electrical insulation Good (high insulation, and not affected by temperature, humidity) and a series of advantages, these characteristics of PTFE are closely related to its molecular configuration.

Due to the strong mutual repulsion between the unbonded fluorine atoms in the molecules, the carbon chain of PTFE is twisted and becomes a spiral structure, and the fluorine atom just completely covers the main chain of carbon atoms, which prevents carbon atoms from interacting with other substances. react. In addition, the fluorocarbon bond has a very high bond energy of 466KJ/mol, which is the highest among all chemical single bonds, so the stability of PTFE is very high.

However, PTFE also has its own shortcomings, mainly manifested as cold fluidity, large linear expansion coefficient, poor thermal conductivity, wear resistance, creep resistance, and outstanding surface non-stickiness, etc. These defects of PTFE make it used in restricted to a certain extent.

my country is one of the earliest countries in the research and production of PTFE, but in the past, it was mainly based on the application of foreign technology for some simple processing, with less in-depth research, and the overall production level and process technology were not high. With years of accumulation and development, especially in the past ten years, the technical level of my country's fluorine chemical industry has developed rapidly. At present, there are 14 domestic enterprises producing PTFE, including Dongyue, Chenguang, Sanaifu, Juhua, and Meilan, and 5 have a production capacity of more than 10,000 tons. Since the properties of PTFE are so special, where is it usually used?