Linyi Dingsheng Powder Coating Co., Ltd.
What is the effect of particle size of electrostatic powder on its performance
Release time:
2025-07-09
The contact area between coarse particle plastic powder and the workpiece surface is relatively small, and the adhesion may be poor.
The particle size of electrostatic plastic powder will affect its performance from multiple aspects. The following is a detailed introduction for you:
The impact on the performance of painting process
Powder loading rate: Generally speaking, electrostatic plastic powders with finer particles have a larger specific surface area, are more likely to carry charges in an electrostatic field, and can be more evenly suspended in the air. This makes it easier for fine particle plastic powder to adsorb onto the surface of the workpiece, thereby increasing the powder loading rate. On the contrary, plastic powders with coarser particles, due to their larger mass, experience greater resistance to their movement in an electrostatic field, resulting in a relatively lower powder loading rate. For example, in the coating of some complex shaped workpieces, fine particle plastic powder can better cover the corners and grooves of the workpiece, while coarse particle plastic powder may have problems such as uneven powder application and missed coating.
Flatness: Particle size affects the leveling of plastic powder in a molten state. Fine particle plastic powder can flow and fuse faster after melting, forming a smoother and smoother coating surface. This is because the gaps between fine particles are smaller, which can be better filled and bridged after melting, reducing surface defects. When coarse particle plastic powder melts, the fusion speed between particles is slow, which can easily lead to surface defects such as orange peel and granular protrusions, affecting the appearance quality of the coating.
The impact on the physical properties of coatings
Mechanical performance
Hardness: A suitable small particle size can help improve the hardness of the coating. During the melting and solidification process of fine particle plastic powder, the bonding between particles becomes tighter, resulting in a denser coating structure and thus improving the hardness of the coating. However, if the particles are too fine, it may lead to an increase in internal stress in the coating, which in turn reduces the hardness of the coating. The coating structure formed by coarse particle plastic powder is relatively loose, and the hardness is usually low.
Wear resistance: Similar to hardness, coatings formed by fine particle plastic powder have better wear resistance. A tight coating structure can better resist friction and wear from external objects, extending the service life of the coating. Due to its loose structure, coarse particle coatings are prone to particle detachment when subjected to friction, leading to accelerated coating wear.
Adhesion: Particle size also affects the adhesion between the coating and the workpiece. Fine particle plastic powder can better penetrate into the tiny pores on the surface of the workpiece, increasing the mechanical biting force between the coating and the workpiece, thereby improving adhesion. The contact area between coarse particle plastic powder and the workpiece surface is relatively small, and the adhesion may be poor.
Corrosion resistance: The coating formed by fine particle plastic powder is denser and can effectively prevent corrosive media (such as water, oxygen, chemicals, etc.) from penetrating into the interior of the coating, thereby improving the corrosion resistance of the coating. Due to the presence of numerous pores and defects, coarse-grained coatings are more susceptible to corrosive media intrusion, leading to premature failure of the coating.
The impact on the optical properties of coatings
Glossiness: Particle size is one of the important factors affecting the glossiness of coatings. The coating formed by fine particle plastic powder has a smooth surface, more uniform reflection of light, and can achieve higher glossiness. The surface of the coating formed by coarse particle plastic powder is rough, and light will diffuse on the coating surface, resulting in a decrease in glossiness and presenting a matte or low gloss effect.
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