Cadmium pigments consist of solid solutions of CdS, ZnS, CdSe etc. at various ratios.
They have two crystal forms in normal conditions, i. e. zincblende (β-type) and wurtzite (α-type) β-type is stable at temperatures lower than about 450°C. But, the stable and brilliant β-type pigments have not been manufactured until now.
We have prepared the stable β-type CdS and the 5 CdS ? ZnS pigments in highly crystalline powder form and brilliant color. Some pigment characters of these new type were compared with those of conventional α-type pigments.
The obtained results were as follows. The β-type was practically stable below 500°C heat treatment and weather resistant in color change and crystalform. Moreover its dispersiblity in plastics was better than that of α-type.
The β-type pigments proposed here seem to be hopeful for the future pigment industry.
View full abstract