Лако-красочные материалы — производство

These dyes are the backbone of most commercial dye ranges. Based entirely on benzene and naphthalene derivatives, they provide yellow, red, blue, green, and black colors for all the major substrates such as polyester, cellulose, nylon, poly­acrylonitrile, and leather. Typical structures are (79)-(84).

C. I. Disperse Yellow 3 (79) is used to dye polyester; C. I. Reactive Orange 1 (80) is a cotton dye; C. I. Direct Orange 26 (81) is a dye for paper; C. I. Basic Red 33 (82) dyes acrylic fibres; C. I. Acid Red 38 (83) dyes nylon and wool; C. I. Reac­tive Black 5 (84) dyes cotton.

Most azoic dyes belong to the carbocyclic azo class, but these dyes are formed in the fiber pores during the application process.

The carbocyclic azo dyes are highly cost-effective and have good all-around fastness properties. However, they generally lack brightness and consequently cannot compete with anthraquinone dyes in this respect. This shortcoming of car­bocyclic azo dyes is overcome by heterocyclic azo dyes, as well as other dye classes such as triphenodioxazines and benzodifuranones.