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Powder coatings are solid powder coatings composed of solid resins, pigments, fillers and additives, which are mostly used for anti-corrosion construction.
Compared with ordinary solvent-based paints and water-based paints, its dispersion medium is different.
The dispersion medium of solvent-based paints is organic solvent, the dispersion medium of water-based paints is water, and the dispersion medium of powder coatings is air.
Since powder coatings basically do not contain organic solvents and are environmentally friendly coatings, the com" href="http://">online coatingol.
com has been vigorously promoted in the field of environmental protection .
In addition to environmental protection, powder coatings also have the advantages of reusability and high comprehensive utilization.
Powder coatings are generally applied by electrostatic spraying.
The principle of electrostatic spraying is to use high-voltage electrostatic corona electric field to connect a high-voltage negative electrode to the metal diversion mark of the spray gun head, and the sprayed workpiece is grounded to form a positive electrode, so that the spray gun and the workpiece A strong electrostatic electric field is formed.
When the compressed air used as the carrier gas sends the powder paint from the powder supply tank to the guide rod of the spray gun through the powder pipe, the corona discharge generated by the guide rod connected to the high voltage negative electrode generates a dense negative charge nearby.
Good powder coatings are easy to spray, and the substrate can be covered by spraying 1-3 guns, with less secondary powder recovery and high work efficiency.
Poor powder coatings are not good for powder coating, and the substrate can be covered by spraying 3-5 guns.
The secondary recovery of powder is too much and the work efficiency is low.
Through recycling and then construction, the comprehensive utilization rate of a good powder coating can reach 99%.
For powder spraying, the importance of one-time powder application rate must not be ignored.
The powder coating rate generally refers to the powder coating coverage rate.
Under the premise of ensuring the appearance and mechanical properties of the powder coating film, the amount of powder coating consumed per unit profile is a problem of production cost.
01
Control the particle size distribution of powder coatings, the narrower the better.
Since the particle size of the powder coating is related to the charge amount, the larger the particle size, the greater the charge amount.
If the particle size distribution of the powder coating is not uniform, the larger particle size will reach the surface of the sprayed object first, and the smaller particle size If it arrives later or cannot be reached, the powdering rate at a time is reduced, and the appearance quality of the paint film is prone to problems.
02
Increase resin content.
03
Reasonable selection of pigments and fillers.
04
An indispensable conductive aid.
05
Spraying process conditions.
06
Suitable spray gun.
In addition, if the workpiece has grooves, grooves, sharp corners, small holes and other shapes, Faraday shielding will occur.
