The precious product of ptfe, known as the smoothest substance, is in the guinness book of world records. Limit "material" section in the record of "minimum friction coefficient" small is: under the heading "ptfe material between dynamic and static friction coefficients reached any solid friction coefficient between the lowest 0.02, the equivalent of wet friction coefficient on the surface of the ice contact".
PTFE performance and application.
(1) low friction coefficient.
Low friction coefficient of polytetrafluoroethylene (PTFE) material is well known, in 1949, K.V souter and P.H Thomas in B - L machine measuring friction coefficient of polytetrafluoroethylene (PTFE) material when confirmed: bearing 1 ~ 4 kilograms, sliding speed is 0.1 ~ 10 mm, polytetrafluoroethylene (PTFE) material of the friction coefficient is 0.04. The friction coefficient reached 0.01 in the case of 1360 kg.
(2) temperature performance.
High temperature stability of polytetrafluoroethylene (PTFE) resin material comes from the strong carbon - fluorine keys, and determine the polytetrafluoroethylene (PTFE) resin material has become a very useful high temperature resistant polymer. Therefore, PTFE resin material remains unchanged at the high temperature limit of almost all other thermal plastics and synthetic rubber. At the same time, compared with other polymers, polytetrafluoroethylene (PTFE) resin material has a very high melting viscosity in the case of pure pressure and high temperature. Polytetrafluoroethylene (PTFE) resin material has high heat resistance, high melting point, high melting point and self-ignition point, and PTFE resin material can resist high temperature and flame. At normal operating temperature range, polytetrafluoroethylene (PTFE) rated maximum temperature is 260 ℃, and in this case, it is not hot fission. Within the scope of the observation of 260-360 ℃, weight loss is fairly small, and the loss was due to absorption of a small amount of gas and water in the aggregate. Only under the condition of temperature over 400 ℃, polytetrafluoroethylene (PTFE) resin material thermal fission became apparent.
Polytetrafluoroethylene (PTFE) resin material can maintain good performance at low temperature. At very low temperature, it can maintain strong impact resistance. Even in low temperature to - 196 ℃, carefully manufacturing specimen remains resilient, it has been proved that polytetrafluoroethylene (PTFE) resin material above the temperature to 268 ℃ still have use value, and above - 80 ℃ with high plasticity.
(3) chemical stability.
As we have observed, the molecular structure of polytetrafluoroethylene (PTFE) resin consists of a chain of carbon atoms covered by fluorine atoms. The fluorine atoms shell to protect the vulnerable to erosion chain of carbon atoms, which made of polytetrafluoroethylene (PTFE) resin material has exposed not react with the solvent in solvent unique stability and resistance to decomposition. Polytetrafluoroethylene (PTFE) materials have little chemical reaction with any known chemical, and can resist corrosive chemicals and solvents even at extremely high temperatures and pressures. In the normal operating temperature range, the resin will not be dissolved and expanded by any solvent. This unique stability comes from the strong carbon - carbon bonds and strong carbon - a combination of fluorine in the key, and almost perfect fluorine atoms on the carbon skeleton chain protection shell and high molecular weight polymer, this structure also have some special properties, such as low coefficient of friction and insoluble.
We have been in Florida for over 20 years and proved that PTFE resin material is transparent to uv light, resistant to oxidation and surface contamination, and is not discoloured or brittle. Polytetrafluoroethylene (PTFE) resin material does not change the visual effects of exposure to infrared to uv spectrum.
Polytetrafluoroethylene (PTFE) resin material has strong resistance to water. It can completely resist water solubility, water infiltration great obstacles, after immersion in water for a long time can still remained stable, in the United States, France and the former Soviet countries such as the experiments of the resistance to water vapor, polytetrafluoroethylene (PTFE) resin material than almost any known plastic material to steam permeability are all well. Polytetrafluoroethylene (PTFE) resin material has much lower gas permeability than most polymers. Due to the extremely low permeability of PTFE resin, it is widely used in chemical industry excellent shielding resin.
(4) electrical performance.
As early as 1946, it was known that polytetrafluoroethylene (PTFE) had no electric polarity, making it an ideal insulator, or non-conductive. Excellent insulation performance, together with its mechanical strength, chemical and thermal stability makes PTFE a versatile electrical insulator. Since PTFE resin does not absorb water, it can be impregnated in water for a long time without changing its electrical impedance.
(5) fiber performance.
Polytetrafluoroethylene (PTFE) fiber and chemical resistance properties of polytetrafluoroethylene (PTFE), low friction coefficient, high wear characteristics of unique and high intensity, the combination of the tough durable fiber structure. The high-porosity fiber structure, such as g-t, can be used in a variety of applications, and has been developed. It is a unique chemical fiber capability that USES the polytetrafluoroethylene (PTFE) resin.
(vi) safety and reliability.
Over the past 50 years, thousands of tons of PTFE have been produced and applied in a variety of potentially dangerous environments, including many applications that exceed the rated temperature. There is no such thing as the use of PTFE to cause illness and death and injuries.
PTFE has no irritation to the skin. Practice also shows that when swallowed, it is stable without chemical reaction. For 90 days, 25 percent of the fine polytetrafluoroethylene (PTFE) resin powder was added to the rats' daily food, and no symptoms of poisoning or digestive disorder were found. The same results were found in seven consecutive months of experiments. Because polytetrafluoroethylene (PTFE) resin polymers do not react with most chemicals, there is little possibility of producing toxic products through chemical reactions. Polytetrafluoroethylene (PTFE) when the temperature was 200 ℃ don't absorb the acid and alkali. It absorbs extremely small amounts of solvents and does not have a large effect on the bonds within the molecule, so it should not be confused with fission.