Teflon spray high-performance special coatings are fluorine coatings based on polytetrafluoroethylene (both transliterated from Teflon), and Teflon spray high-performance special coatings are fluorine coatings based on polytetrafluoroethylene (both transliterated from Teflon). PTFE spray coating is a kind of high-performance coating integrating heat resistance, chemical inertia, excellent insulation stability and low friction, and has comprehensive advantages that other coatings cannot match.
The flexibility of its application allows it to be used in almost all shapes and sizes. PTFE spraying can be divided into several basic types: TFE, FEP, PFA and ETFE.
Teflon spray PTFE: PTFE (polytetrafluoroethylene) non-stick coating can be used continuously at 260 °C, with extremely low friction coefficient, good wear resistance, and good chemical stability at 290 °C.
Teflon spray FEP: FEP (fluorinated ethylene propylene copolymer) non-stick coating melt flow during baking to form a porous film, with good chemical stability and excellent non-stick properties, the use temperature is 200 °C.
Teflon spray PFA: PFA non-stick coating, like FEP, forms a porous film during the baking process, and its advantages are high continuous use temperature, use temperature of 260 °C, strong hardness and toughness, especially suitable for high-temperature anti-adhesion and chemical resistance applications.
Teflon Spray ETFE: ETFE is an ethylene-tetrafluoroethylene copolymer. The resin is a tough fluoropolymer that forms a durable coating that is chemically resistant and works continuously at 150°C.
Teflon spraying:
First, the dispersion coating overview
Dispersion coating is processed by evenly distributing the coating material in a solvent to form a dispersed liquid (solid substances mixed in a liquid). This mixture is atomized by high-pressure air and sprayed on the surface of the workpiece.
II. (1) Preparation of workpieces
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 make it completely volatilize. In the next step, the workpiece is cleaned and the surface is rough sandblasted. The use of adhesives (primers) can improve the ability of the coating to adhesion to the surface of the workpiece.
Powder coating
The powder particles are blown out of the collector by compressed air, and on the way to the nozzle of the spray gun, there is an electrostatic zone. Since the particles carry the same electric charge, they repel each other on their flight paths, forming a uniform cloud. The workpiece to be painted is ground to create an electrostatic zone between the gun and the workpiece. The powder particles are attracted to the workpiece and attached to the workpiece.
Powder melting
In coating technology, there are principled 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 covered on it. In this way, the powder is melted during the spraying process.
(2) Preparation of workpieces
In order to achieve 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 about 400°C to make it completely volatilized. In the next step, the workpiece is mechanically cleaned and rough with sandblasting. The adhesion of the coating to the surface of the workpiece can be improved by applying a bonding additive (primer).
