Лако-красочные материалы — производство

The main applications of metallic effect pigments are paints and coatings, printing inks and graphic arts as well as plastics and colorants (masterbatches). Coatings The applications in the coatings industry include automotive coatings (OEM, refinish and interior as well as exterior parts), general industrial coatings, can coatings, coil coatings, powder coatings, decorative coatings, aerosols, anticorrosion […]

All the optical measurements for characterizing the metallic effect should be carried out with goniophotometers and/or goniospectrophotometers to take the flop effect into account [5.176-5.181]. 5.3.2.6

Last but not least, the role of the particle orientation within the dry film has to be considered. Preferably, all the flakes are oriented parallel to the substrate, because the resulting parallel light reflection yields a maximum of lightness, brilliance and flop. On the other hand, a poor orientation results in an irregular reflection, causing […]

As the particle size of the individual flakes plays a significant role in generating the metallic effect, the particle size distribution is even more important to describe the total effect: the smaller the share of fine and ultra-fine particles, the higher will be the brightness, brilliance and flop, as well as the chroma in tinted […]

Like the particle size, the particle shape also has a significant influence on the optical effect: the smoother the surface, the better (and more parallel) is the reflection and the rounder and more regular the particle, the lower the amount of scattering. This means, comparing “cornflake-types” and “silverdollar-types” of aluminum pigments with similar particle size […]

The physical parameters for the metallic effect, which influence the ratio between reflection and scattering and thereby the flop effect, the lightness and brightness, the brilliance and sparkle, the gloss and the distinctiveness of image (DOI) etc. etc. can simply be described in terms of particle size, particle shape (morphology), particle size distribution and particle […]

The metallic effect is caused by the reflection of light at the plane surfaces of the metal­lic flakes, which is overlaid by the scattering of light at the edges (Figure 5.31). The metal flakes act like tiny mirrors, following the physical principle that the reflection angle is the same as the angle of illumination. Whereas, […]

The size of the particles depends also, like the particle shape, on the manufacturing conditions and varies from a few pm up to 100 pm, depending on the optical effect required and the application conditions. The fineness of the pigment is characterized by the maximum particle size (men­tioned in the catalogues as sieve residue according […]

Leafing/Non-Leafing One of the most typical properties of metallic pigments is their wetting behavior in different solvents (including water) or binder solutions. Metal effect pigments are basically divided into leafing and non-leafing types (Figure 5.29). Leafing pigments float on the surface ofthe wet film, orienting themselves parallel to the surface and thereby forming a dense […]

The technology of manufacturing metal pigments goes back to the gold-beaters craft. Upon industrialization, this handcraft was followed by stamping technology, which in some countries and for some special applications is still in use. The stamping technology was followed by ball milling processes, including dry milling (Hametag — process) [5.169] and wet milling (Hall-process) [5.170]. […]