Phthalocyanine Blue Pigment Commonly Used In Coatings
Phthalocyanine blue pigment is a dark blue powder, its chemical structure is very complex, mainly composed of copper phthalocyanine, phthalocyanine blue has a lot of crystalline state, in the industrial coatings commonly used phthalocyanine blue pigments are pigment blue 15, pigment blue 15:1, pigment blue 15:3 and pigment blue 15:6, etc. Below pigment blue 29 supplier to briefly introduce these kinds of phthalocyanine blue pigment for everyone.
Pigment Blue 15 is an alpha-type phthalocyanine pigment with a reddish hue, relatively higher coloring power and low cost characteristics.
Pigment Blue 15:3 is a beta-type phthalocyanine blue pigment with a greenish hue and optimal thermal stability.
Pigment Blue 15:6 is an ε-type phthalocyanine blue pigment with the strongest red light and the most vivid red hue of copper phthalocyanines.
In the α-type phthalocyanine blue pigment containing aromatic solvents, sometimes phthalocyanine blue pigment will be transformed into more stable β-type phthalocyanine blue, in order to prevent α-type phthalocyanine blue from being transformed, usually it can be spliced into part of chlorinated copper phthalocyanine in the processing of phthalocyanine blue pigment to form stable α-type phthalocyanine blue pigment blue 15:1. In the field of coating industry, the red-phase α-type phthalocyanine blue is due to the color and lustre of the bright and strong coloring power, easy dispersion and good fluidity and other characteristics. In the field of coating industry, the red-phase α-type phthalocyanine blue is used more than the green-phase β-type phthalocyanine blue due to its bright color, strong coloring power, easy dispersion and good fluidity.
The surface of phthalocyanine blue 15:1 has nonpolar, so in most coating systems, the interaction between it and the binder is weak, which will make the pigment dispersion system not stable, leading to the flocculation of phthalocyanine blue pigment more easily in the coating system, and the coating system containing phthalocyanine blue pigment is more prone to delamination of paint in the storage, which is a defect which only needs to be made in the relatively stable pigment blue 15:1 molecule, so that the pigment blue 15:1 is more easily dispersed. This defect can be greatly improved by surface treatment and chemical modification on the relatively stable pigment blue 15:1 molecule, and the improved phthalocyanine blue pigment is designated as pigment blue 15:2 in the dye index.
Because the occurrence of flocculation in coatings is not only related to the pigment, but also to the binder and solvent in the coating system, it is impossible to find a variety of phthalocyanine blue that can show the best anti-flocculation performance in any coating system, therefore, coating workers have to experiment for different coating systems to come up with the best formulation combinations.