What information is related to the pros and cons of powder coatings?

Powder coatings for electrostatic spraying need to pay attention to the following parameters in order to ensure the smooth implementation of the electrostatic spraying process and obtain a high-performance coating fi.

Particle size of powder coating

A significant difference between powder coatings and solvent-borne coatings is the dispersion medi.

Therefore, the fineness of powder particles for electrostatic spraying is importa.

Resistivity and Dielectric Constant of Powder Coatings

For the powder electrostatic spraying process, it is important to consider that the powder coating particles accept the charge, maintain the charge and the charge distribution, which directly affects the adsorption force and deposition efficiency of the powder on the workpie.

In fact, the main factor that affects the charge acceptance and charge retention of powder particles is the dielectric constant of powder coati.

For powder coatings, they are all composed of polymer compounds (such as epoxy powder, polyester powder, e.

Moisture content of powder coatings

The hygroscopicity (water content) of the powder coating itself directly affects the resistance and dielectric constant of the powder itse.

The moisture absorption of powder coatings is not only caused by careless storage and storage, but also related to the degree of compressed air purification during sprayi.

Because condensed water is easily generated in the compressed air, there must be a filter moisture absorption device in the air purification system to minimize the water content in the air leading to the powder feed.

According to data reports, every 30% change in relative humidity is equivalent to two orders of magnitude change in the resistivity of the powd.

Stability of powder coatings

The stability of powder coatings refers to whether the powder will agglomerate during storage or use, the leveling characteristics will become worse, the charging effect will become worse, the orange pattern of the coating film will be obvious, the gloss will be weakened, and pinhole bubbles will occ.

When trial-producing powder coatings, we must pay attention to the stability of their stora.

The stability of the powder coating is determined by measuring the leveling change of the powder coating at a certain temperature and after a certain period of ti.

Experiments have confirmed that the properties of powder coatings, one of the two major components of powder electrostatic spraying process, cannot be ignored; while developing and discussing electrostatic spraying equipment, attention should also be paid to the technical requirements of powder coatin.