Лако-красочные материалы — производство

Azo condensation pigments are among the high performance organic pigments used in the industry. These pigments can be visualized as the condensation of two carboxylic monoazo components with one aromatic diamine through formation of an amide (-CONH-) bridge. Their high MW as well as the presence of amide groups leads to improved solvent fastness, migration resistance, good heat stabi­lity and light fastness properties. They have reasonably good tinting strength and excellent chemical stability but are relatively expensive. They are used in high grade industrial coatings and specialty prin­ting inks. The products cover the range of colors from yellow through orange and bluish-red to brown. Some common pigments in this class are Pigment Yellow 93, 94, 128 and 166 and Pigment Red 144 and 166. The example of Pigment Yellow 128 is shown in Figure 3.13.