Do You Know Characteristics and Advantages of Teflon Spraying and Spraying Process?

Polytetrafluoroethylene spray coating is a kind of high performance coating which integrates 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 every shape and size. Ptfe coatings can be divided into several basic types: PTFE, FEP, PFA and ETFE.

Teflon spray PTFE: PTFE non-stick coating can be continuously used at 260 ° C, the friction coefficient is very low, good wear resistance, and has good chemical stability at 290 ° C.

Teflon spray FEP: FEP non-stick coating melts and flows during baking to form a porous film, which has good chemical stability and excellent non-stick properties, and the use temperature is 200℃.

Teflon spray PFA: Like FEP, PFA non-stick coating forms a porous film during the baking process, which has the advantages of high continuous use temperature, use temperature of 260 ° C, hardness and toughness, especially suitable for high-temperature adhesion resistance and chemical resistance applications.

Teflon Spray ETFE: The resin is a tough fluoropolymer that forms a durable coating with chemical resistance and can operate continuously at 150 ° C.

Teflon spray:

Overview of dispersion coating

The processing method of disperse coating is to evenly distribute the coating material in the solvent to form a dispersed liquid (solid substance mixed in the liquid). This mixture is atomized by high-pressure air and sprayed on the surface of the workpiece.

(1) Preparation of the workpiece

In order to obtain sufficient surface adhesion on the workpiece surface, all grease must first be removed from the surface to be coated. We dissolve the oil in 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 bind to the surface of the workpiece.

 Powder spraying

The powder particles are blown out of the collector by compressed air, and on their way to the spray gun nozzle, there is an electrostatic zone. Since the particles carry the same charge, they repel each other along the flight path, forming a uniform cloud. The workpiece to be sprayed is ground to create an electrostatic zone between the gun and the workpiece. The powder particles are attracted to and attached to the workpiece.

Powder melting

In coating technology, high temperature spraying and low temperature spraying are different in principle. If high temperature spraying is used, the temperature of the substrate is higher than the melting temperature of the powder material, and the powder particles are covered on it. In this way, the fine powder 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 fats and oils and heat them to about 400°C to completely evaporate them. Next, a mechanical sandblasting process is used to clean the piece and roughen its surface. The bonding ability of the coating to the surface of the workpiece can be improved by applying a bonding agent (primer).

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