The difference between the powder electrostatic spraying and electrophoretic painting
Source: China automobile coating network
Electrophoretic painting is the electrical conductivity of the coated material impregnated in filled with water dilution and low concentration tank as anode or cathode electrodeposition coatings, the other set in the tank and its corresponding to the cathode (or anode), through a certain period of time between the poles of direct current, homogenous precipitation on the coating, water insoluble coat of a coating method. Powder electrostatic spraying technology is used in powder - air mixture. Set in the powder into the hopper there is a small fluidized bed - air mixture to form a powder. In some cases, the vibration of the feed hopper to prevent clogging powder before entering the conveyor line or gathered. Powder is transported by a hose to the spray gun, spray gun nozzle due to the input of the high voltage direct current (dc) and the charged electrode.
The difference between electrostatic painting has the following features:
Due to the electrostatic effect, make the spray paint film even full, strong adhesion, adornment sex is good. High productivity, spray gun used at the same time it can realize semi-automatic, automatic line production. Compared with traditional compressed air spray paint, productivity can be improved several times. Due to the electrostatic adsorption, reduce the pollution of paint mist, which improved the labor hygiene conditions. Electrostatic painting due to improve the utilization rate of the paint, reduce the cost. Electrostatic painting because of the mist charged insulation, so for concave hole is not easy to Shanghai juji complex parts, and the convex part of the uneven distribution of paint film, operation process should be paid attention to adjust or repair manual.
Although electrophoresis paint by using different types of electrophoresis coating, electrophoresis construction technology conditions, the electrophoresis results will be different. But generally has the following features:
(1) electrophoresis paint coating quality is roughly is proportional to the amount of electricity, and so can lend to adjust the coating deposition amount increase or decrease in electricity;
(2) electrophoresis paint to make complex shape by sharp edge or corner part of coating material, welding seam gap, such as internal and external surfaces of the box body can be obtained more uniform paint film, anti-corrosion performance get improved significantly;
(3) electrophoresis paint film drying moisture content is very low before, it does not dissolve in water, does not flow, not easy to produce the vertical drop, flow mark, hysteresis marks film ills such as; Don't like when dip coating film drying in drying (box or pipe internal) solvent washing occur frequently; Also can significantly shorten the drying before make the evaporation of water of pre drying time;
(4) with negatively charged polymer particles under the action of electric field directional deposits, thus water resistant performance of electrophoretic paint film is very good; Adhesion is also higher than other construction methods;
(5) electrophoresis paint used to paint liquid concentration, low viscosity, so by maceration adhesion on the coated material out of the paint is less, especially after ultrafiltration technique used in electrophoresis paint, paint utilization and even can be as high as 100%;
(6) the same as the general waterborne paint, electrophoretic paint overcome the problem of fire and benzene poisoning.
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