spray powder coating powders

Spraying plastic powder:

Compared with traditional spray painting process, electrostatic spraying technology has obvious advantages, such as no thinner, no pollution to environment no harm to human body; excellent appearance quality of coating, strong adhesion mechanical strength; short curing time of spraying construction; much higher corrosion resistance wear resistance of coating; no primer; simple construction, low technical requirements for workers; cost In some cases, the electrostatic spray process must be lower than the spray painting process.

The process principle of electrostatic spraying is to charge the plastic powder through high-voltage electrostatic equipment, evenly adsorb it on the surface of the workpiece under the action of electric field. After baking at high temperature, the plastic particles will melt into a dense protective layer firmly adhere to the surface of the workpiece.The process flow of electrostatic spraying is pretreatment (degreasing, derusting phosphating); electrostatic spraying; high temperature curing (referring to the required temperature of plastic powder, generally 160 ~ 210 ℃); cooling out of furnace.

The electrostatic spraying of powder coating is called spraying plastic powder. Its principle is that the powder coating is adsorbed on the workpiece by corona discharge. The process is as follows: the powder coating is fed into the spray gun by the powder supply system through compressed air, the high voltage generated by the high-voltage electrostatic generator is added at the front end of the spray gun. Due to corona discharge, dense charges are generated near the powder. When the powder is ejected the gun nozzle, the charged coating particles are formed, which are absorbed to the workpiece with opposite polarity under the action of electrostatic force When the thickness reaches a certain thickness, due to electrostatic repulsion, it will continue to adsorb, so that the whole workpiece can obtain a certain thickness of powder coating, then the powder will be melted, leveled solidified by heat, that is to say, a hard coating film will be formed on the surface of the workpiece.