Electrostatic Powder Coating: electrostatic powder coating can also be called powder spraying, a new spraying method that uses high-voltage electrostatic electric field to make negatively charged paint particles move in the opposite direction of the electric field, and then are adsorbed on the surface of the workpiece to be coated
Painting: the traditional manual painting process
What the difference between the electrostatic powder coating and painting?
1.For the Electrostatic powder coating:
Preliminary surface treatment on the steel, such as degreasing, surface conditioning, hot-dip galvanizing, cleaning, phosphating, and drying. These series of preliminary processes mainly serve to remove rust and impurities, and not only remove the inducement of steel rust. It also produces a zinc coating and phosphating film on the surface of the steel. The zinc coating protects the steel from corrosion and rust. The phosphating film allows the powder to be sprayed on the surface of the steel to have stronger powder adhesion. After the pre-treatment of the steel is completed, the equipment consisting of spray gun, spray cup and spraying high-voltage power supply is used to make the negatively charged paint particles move in the opposite direction of the electric field by using the high-voltage electrostatic electric field, and then are adsorbed on the surface of the steel to be coated. A high-performance electrostatic spraying machine is used to complete the spraying, and the electrostatic shielding is used to achieve the effect of powder adhesion. Heat the powder coating on the steel surface to the specified temperature (180℃-220℃) and keep it warm for the corresponding time to melt, level and solidify, so as to obtain the surface effect of the guardrail product we want.
The surface of electrostatic spraying is bright and clean, can realize special layer and feel, is not easy to fall off, and has excellent weather resistance. The production line of the guardrail industry has been realized, and the quality of the products and the investment in labor costs have been improved.
The use of spray paint process also requires pre-treatment of steel. The general process is pickling (or shot blasting)-degreasing-phosphating-washing-natural drying-putty-spray primer-spray paint-natural drying. The traditional intermediate coating and top coating lines use manual air spraying technology, which generally use non-assembly line operations, which are sensitive to the outside climate and cannot be constructed on rainy days. They are suitable for multi-variety, low-volume production.
The paint spraying process is more flexible than powder spraying, but the spraying effect is rougher, the weather resistance of the layer is short, and the excess paint can not be recycled and become environmental pollution.