Spray coating technology refers to the application of a coating with a thickness of 0.01-3mm of Teflon (FEP, PFA, ETFE, ECTFE, etc.) to products. This four-fluorine spray coating offers functionalities such as anti-adhesion, wear resistance, lubrication, antibacterial properties, cleanliness, heat resistance, and corrosion prevention. It is widely applicable across various industrial sectors: Chemical Industry – reaction tanks, storage tanks, heat exchangers, stirrers; environmental engineering wastewater and gas treatment equipment, piping, valves, pumps. Textile Industry – sizing rollers, dyeing and finishing rollers, non-woven fabric rollers. Electronics Industry – acid-resistant and fire-retardant exhaust ducts in semiconductor factories, printed circuit boards, electroplating racks. Food Industry – baking equipment, baking pans, molds, various food processing machinery and parts. Electronics and Electroplating Industry – corrosion prevention (used for printed circuit board racks, clamps, etc.). Semiconductor Industry – corrosion prevention, flame retardant (acid exhaust ducts and their components).
Teflon PTFE: The PTFE non-stick coating can be used continuously at 260°C, with a service temperature range of 290-300°C, featuring a very low coefficient of friction, excellent wear resistance, and excellent chemical stability.
Teflon FEP: FEP, also known as F46 (polyfluoroethylene propylene copolymer), is a non-stick coating that melts and flows during baking to form a poreless film. It boasts excellent chemical stability and non-stick properties, with a service temperature of 200°C.
Teflon PFA: PFA (perfluoroalkylated compound) non-stick coating, like FEP, melts and flows during baking to form a poreless film. The advantages of PFA include a higher continuous use temperature of 260°C, greater toughness, and is particularly suitable for high-temperature conditions where non-stick and chemical resistance are required.
Teflon ETFE: ETFE is a copolymer, a resilient fluoropolymer resin that can form a highly durable coating with excellent chemical resistance and can operate continuously at temperatures up to 150°C.
After being coated with Teflon, it possesses the following characteristics:
Non-stick: Almost all materials do not adhere to the Teflon coating. Even a very thin film demonstrates excellent non-stick properties.
2. Heat Resistance: The Teflon coating exhibits excellent heat and cold resistance. It can withstand high temperatures up to 300℃ for short periods, and is typically used continuously between 240℃ to 260℃. It boasts remarkable thermal stability, functioning effectively at freezing temperatures without becoming brittle and remaining solid under high heat.
3. Slippage: The Teflon coating has a low coefficient of friction. The coefficient of friction changes during load sliding, but the value is only between 0.05-0.15.
4. Water and Oil Resistance: The Teflon coated surface is non-stick to water and oil, and also resists solutions during production operations. Any minor dirt can be easily wiped off. Short downtime saves labor hours and enhances work efficiency.
5. Abrasion Resistance: Under high loads, it exhibits excellent wear resistance. At certain loads, it boasts both wear resistance and non-stick properties.
6. Corrosion Resistance: Teflon is almost unaffected by chemical erosion and can protect parts from any type of chemical corrosion. It is a polymer, abbreviated as PTFE. The trade name is "Teflon" and it is famously referred to as the "King of Plastics." Its basic structure is -CF2-CF2-CF2-CF2-CF2-CF2-CF2-CF2-CF2-CF2-. It is widely used in various applications requiring resistance to acidic, alkaline, and organic solvents. It is non-toxic to humans, but PFOA (perfluorooctanoic acid), one of the materials used in its production, is considered potentially harmful. It has a relatively high molecular weight, ranging from tens of thousands to over ten million, generally in the millions (polymerization degree at the 10^4 order of magnitude, while polyethylene is only at 10^3). The crystallinity is usually 90-95%, with a melting point of 327-342°C. The CF2 units in the molecule are arranged in a zigzag pattern, as the fluorine atom's radius is slightly larger than hydrogen, preventing complete trans-configuration between adjacent CF2 units and instead forming a helical twisted chain, with fluorine atoms almost covering the entire surface of the polymer chain. This molecular structure explains its various properties. Below 19°C, it forms a 13/6 helix; at 19°C, a phase transition occurs, slightly unwinding the molecule to form a 15/7 helix. It does not melt at 250°C and does not become brittle at -260°C. It is exceptionally smooth, even smoother than ice; it has excellent insulating properties, where a thin film as thick as a newspaper can withstand 1500V of high voltage. Polymerization is achieved through free radical polymerization, often conducted in the presence of large amounts of water to dissipate reaction heat and facilitate temperature control. It is typically polymerized at 40-80°C and 3-26 kgf/cm² pressure, using inorganic persulfates or organic peroxides as initiators, or redox initiation systems. Each mole of polymerization releases 171.38 kJ of heat. Dispersion polymerization requires the addition of perfluorinated surfactants, such as perfluorooctanoic acid or its salts. Applications include compression or extrusion molding, as well as water-dispersible formulations for coatings, dipping, or fiber production. It is widely used in industries such as nuclear energy, aerospace, electronics, electrical, chemical, mechanical, instruments, meters, construction, textiles, and food, serving as a material for high and low temperature resistance, corrosion resistance, insulating materials, and non-stick coatings.
