Specific effects of particle size distribution on the performance of electrostatic spraying powder coatings.
1.Appearance, leveling
Generally speaking, the smaller the particle size of the powder, the better the leveling of the coating when curing, and the appearance of the coating film will be more flat and smooth, but the charged nature of the powder is proportional to the square of the particle size, the powder is too fine charged to reduce the efficiency of the coating construction will be reduced, ultra-fine powder is basically not charged.
- The powder rate has an important relationship with the charged property of the powder coating itself. Increase the charge of the coating particles, the powder rate will be increased. The charged amount of the particles is proportional to the square of the particle size. If the particle size is increased, the charge of the coating particles will increase and the powder rate will increase. However, the particle size should not be too large. If the particle size is too large, the gravitational force of the paint particles will exceed the aerodynamic force and electrostatic force, which will reduce the powder rate.
- Recovery rate Powder coatings in the production and use of the process there is the problem of recovery of powder, usually, powder particle size of ultra-fine powder recovery rate is low, when the powder coating particles recovery rapidly rise, and the recovery rate of powder with the increase in particle size and increase. Even for the above reasons, it can be said that the particle size distribution of powder coating particles largely affects the performance and efficiency of powder coating. Therefore, particle size testing equipment is needed to monitor product quality and assist in the development of new products and technologies.
