Coating general knowledge: brief introduction of powder electrostatic spraying method

Core tip: Information: Using air as the power source, the powder is atomized and sprayed on the surface of the workpiece, and then solidified (plasticized) to form the coating There are many kinds of coating methods, among which electrostatic spraying is the most commonly used one The electrostatic powder spraying technology is characterized by that the workpiece can be coated at room temperature; the utilization rate of powder is high, up to 95%; the film is thin and uniform, smooth and free of sagging phenomenon, even on the sharp edge and rough surface of the workpiece, a continuous, flat and smooth film can be formed, which is convenient for the realization of "industrial" production line Application principle: Application scope and advantages of roller ceramic coating Recommended introduction: the surface of ceramic rubber plate used for roller ceramic coating is cast into durable rubber plate by hundreds of independent small ceramic pieces Each ceramic piece has raised characteristics Under general conveyor belt pressure, thousands of unique cast bumps can produce positive traction, prevent slipping and extend the service life of conveyor belt roller At the same time, the bottom layer adopts high-quality rubber, which has strong elasticity and can play a good impact resistance role The scope of application of roller ceramic coating is one three six 83857180 (the same as V) 1 Roller coating in extremely harsh working environment 2 The belt joint is not suitable for fixing with iron buckle; 3 It is suitable for leather Paint Home News: News: use air as power source, spray powder on the surface of the workpiece after atomization, and form the coating after curing (plasticizing) There are many kinds of coating methods, among which electrostatic spraying is the most commonly used one The electrostatic powder spraying technology is characterized by that the workpiece can be coated at room temperature; the utilization rate of powder is high, up to 95%; the film is thin and uniform, smooth and free of sagging phenomenon, even on the sharp edge and rough surface of the workpiece, a continuous, flat and smooth film can be formed, which is convenient for the realization of "industrial" production line Application principle: in high voltage electrostatic spraying, high voltage electrostatic is supplied by high voltage electrostatic generator The workpiece shall be grounded before spraying Under the action of purified compressed air, the powder coating enters the electrostatic powder gun through the powder conveying pipe from the powder feeder The tip of the gun is equipped with a metal ring or electrode needle as the electrode, and the end of the metal ring has a sharp edge When the electrode is connected with high-voltage static electricity, corona discharge occurs at the tip, and dense negative charge is generated near the electrode When the powder is ejected from the head of electrostatic powder gun, the captured charge becomes charged powder, which flies to the grounded workpiece under the action of air flow and electric field, and adsorbs on its surface In the process of powder electrostatic spraying, the force of powder can be divided into the gravity of powder itself, the thrust of compressed air and the gravity of electrostatic field With the help of the thrust of air and the gravity of electrostatic field, the powder overcomes its own gravity, adsorbs on the surface of the workpiece, and then solidifies (plasticizes) to form a solid film From the electrostatic adsorption of powder, it can be divided into the following three stages (A) In the first stage, the negatively charged powder flies to the workpiece along the power line in the electrostatic field, and the powder is evenly adsorbed on the surface of the positive electrode; (b) in the second stage, the attraction of the workpiece to the powder is greater than the repulsive force between the powders, so the powder is piled up intensively to form a certain thickness of coating; (C) For the third stage, with the continuous thickening of the powder deposition layer, the repulsion force of the powder layer to the flying powder increases When the attraction of the workpiece to the powder is equal to the repulsion force of the powder layer to the powder, the flying powder will no longer be absorbed by the workpiece Home of coatings is specialized in coatings, diatom mud, paint coating, coating technology, fire retardant coating news and coating, diatom mud, paint coating, coating technology, fire retardant coating decoration knowledge and decoration renderings,