1. What is Teflon coating?
The full name of Teflon is PTFE, which was discovered by chemist Dr. RoyJ J. 1 Plunkett, Jackson Laboratory, DuPont Company, New Jersey, USA: When he tried to make a new CFC refrigerant, PTFE was polymerized in a high-pressure storage container (the iron on the inner wall of the container became the catalyst for polymerization). Dupont Company obtained the patent at 194 1 and registered the trademark under the name of "Teflon" at 1944. Subsequently, DuPont developed a series of products except Teflon _ PTFE resin, including Teflon; AF (amorphous fluoropolymer), Teflon; FEP (fluorinated ethylene propylene resin), Teflon; FFR (fluoropolymer foam resin), Teflon; NXT (fluoropolymer resin), Teflon; PFA (perfluoroalkoxy resin), etc.
1954, Colette, the wife of French engineer MarcGregoire, had a whim that Teflon, a non-stick material used by her husband to coat fishing lines to prevent knots, would have a good effect if it could be used in a frying pan. The "non-stick pot" that saved countless modern housewives was born.
PTFE is abbreviated as PTFE (commonly known as "Plastic King"). In China, the trademark of Teflon is also called PTFE, Teflon, Teflon and so on. , are transliteration of Teflon. Products of this material are generally called "non-stick coatings"; It is a synthetic polymer material, and all hydrogen atoms in polyethylene are replaced by fluorine. This material has the characteristics of acid resistance, alkali resistance and resistance to various organic solvents, and is almost insoluble in all solvents. At the same time, PTFE has the characteristics of high temperature resistance and very low friction coefficient, which can be used for lubrication and also become an ideal coating for non-stick pots and water pipes.
Teflon coating is a kind of fluorocarbon coating, which is produced by DuPont company in the United States. It uses fluorine-containing resins PTFE, PFA, FEP and ETFE as the main functional raw materials to synthesize various excellent formulas to meet the requirements of all walks of life.
PTFE is called Polytetrafluoroetylene in English, abbreviated as Teflon, PTFE, F4, etc. Polytetrafluoroethylene, usually called "non-stick coating" or "easy-to-clean wok material"; It is a synthetic polymer material, and all hydrogen atoms in polyethylene are replaced by fluorine. This material has the characteristics of acid resistance, alkali resistance and resistance to various organic solvents, and is almost insoluble in all solvents. At the same time, PTFE has the characteristics of high temperature resistance and very low friction coefficient, which can be used for lubrication, and it has also become an ideal coating for easy-to-clean woks and water pipes.
Second, what are the benefits of Teflon coating?
The surface of the substrate treated with PTFE coating can have many excellent functions at the same time:
1, non-stick: almost all substances do not stick to Teflon coating. Very thin coatings can also show good non-stick properties.
2. High and low temperature resistance: PTFE coating can withstand 320 degrees in a short time and can be used continuously between -200 degrees and 260 degrees, with obvious thermal stability. It can work at freezing temperature without embrittlement and does not melt at high temperature.
3. Slippery: PTFE coating has low friction coefficient. The friction coefficient changes when the load slides, but the value is only between 0.05-0. 15.
4. Moisture resistance: the surface of PTFE coating is water-free and oil-free, so it is not easy to contact with solution during production operation. If there is a small amount of dirt, it can be removed by simple wiping. Short downtime, saving working hours and improving work efficiency.
5. Wear resistance: under high load, it has excellent wear resistance. Under a certain load, it has the dual advantages of wear resistance and non-adhesion
6. Corrosion resistance: PTFE is almost free from drug corrosion, and can withstand all strong acids (including aqua regia), strong oxidants, reductants and various organic solvents above 300℃ except molten alkali metal, fluorination medium and sodium hydroxide, and can protect parts from any kind of chemical corrosion.
Third, why should we paint the mold with Teflon paint?
There are many advantages, the following are just a few:
(1) ensures complete demoulding and greatly reduces the rejection rate;
(2) easy demoulding, reducing labor intensity;
(3) No release agent is used, which reduces the cost and environmental pollution and avoids the influence on rubber vulcanization and adhesion;
Fourth, the application field
PTFE can be formed by extrusion or extrusion; Used for high-temperature wires, it can also be made into films, and then cut into axial ptef to make high-frequency cables. Can be directly made into aqueous dispersion for coating, impregnating or making fibers.
Polytetrafluoroethylene is widely used as high and low temperature resistant and corrosion resistant material, insulating material and anti-sticking coating, which is an irreplaceable product in industries such as atomic energy, national defense, aerospace, electronics, electric power, chemical industry, machinery, instruments, architecture, textile, metal surface treatment, pharmacy, medical treatment, food, metallurgy, smelting and so on.
PTFE has excellent comprehensive properties, such as high temperature resistance, corrosion resistance, non-stick, self-lubrication, excellent dielectric properties and low friction coefficient. Used as engineering plastics, it can be made into PTFE pipes, rods, belts, plates, films and so on. Generally used for corrosion-resistant pipes, containers, pumps, valves, radars, high-frequency communication equipment, radio equipment, etc. The mechanical properties of PTFE can be greatly improved by adding any filler that can withstand the sintering temperature of PTFE. At the same time, other excellent properties of PTFE are maintained. Filled with glass fiber, metal, metallized oxide, graphite, molybdenum disulfide, carbon fiber, polyimide, EKONOL, etc. Wear resistance and ultimate PV value can be increased by 1000 times. The coating on the surface of the warhead can increase the penetrating power of the bullet and enable the bullet to penetrate the bulletproof vest.