Teflon spraying high-performance special coating is a fluorine coating based on polytetrafluoroethylene (both transliterations of Teflon). Teflon spraying high-performance special coating is based on polytetrafluoroethylene. (Both are transliterations of Teflon)-based fluorine coating. PTFE spray coating is a high-performance coating that integrates heat resistance, chemical inertia, excellent insulation stability and low friction. It has comprehensive advantages that other coatings cannot match.
The flexibility of its application allows it to be used in almost every shape and size. PTFE spray coating can be divided into several basic types: PTFE, FEP, PFA and ETFE.
Teflon sprayed PTFE: PTFE (polytetrafluoroethylene) non-stick coating can be used continuously at 260℃, with extremely low friction coefficient, good wear resistance, and good chemical stability at 290℃ sex.
Teflon sprayed FEP: FEP (fluorinated ethylene propylene polymer) non-stick coating melts and flows during the baking process to form a porous film, which has good chemical stability and excellent non-stick properties Performance, use temperature is 200℃.
Teflon sprayed PFA: PFA non-stick coating, like FEP, forms a porous film during the baking process. Its advantages are high continuous use temperature, use temperature 260°C, strong hardness and toughness, especially suitable for High temperature anti-adhesion and chemical resistance applications.
Teflon sprayed ETFE: ETFE is an ethylene-tetrafluoroethylene polymer. The resin is a tough fluoropolymer that forms a durable coating that is chemically resistant and can operate continuously up to 150°C.
Teflon spraying:
1. Overview of dispersion coating
The processing method of dispersion coating is to evenly distribute the coating material in the solvent to form Dispersed liquids (solid substances mixed in liquids). This mixture is atomized by high-pressure air and sprayed on the surface of the workpiece.
2. (1) Preparation of the workpiece
In order to obtain sufficient surface adhesion on the surface of the workpiece, all grease must first be removed from the surface to be coated. We dissolve the oil with an organic solvent and heat it to about 400°C to completely volatilize it. In the next step, the workpiece is cleaned and the surface is roughened by sandblasting. The use of adhesives (primers) can improve the bonding ability of the coating to the surface of the workpiece.
Powder Spraying
Powder particles are blown from the collector by compressed air, and there is an electrostatic zone in the process of reaching the spray gun nozzle. Because the particles carry the same electric charge, they repel each other along their flight paths, creating a uniform cloud. The workpiece to be sprayed is ground, creating an electrostatic zone between the spray gun and the workpiece. Powder particles are attracted to and adhere to the workpiece.
Powder melting
In coating technology, there are fundamental differences between high-temperature spraying and low-temperature spraying. If high-temperature spraying is used, the temperature of the substrate is higher than the melting temperature of the powder material, and the powdery particles are coated on it. In this way, the micropowder is melted during the spraying process.
(2) Preparation of the workpiece
In order to obtain sufficient surface adhesion on the surface of the workpiece, all grease on the surface to be coated must first be removed. We use organic solvents to dissolve the grease and heat it to approximately 400°C to completely evaporate it. Next, the workpiece is mechanically cleaned and roughened using sandblasting. The bonding ability of the coating to the surface of the workpiece can be improved by applying an adhesion aid (primer).