Application of carbon black in fiber coloring

The application of carbon black as a dye in fibers can be directly added in the fiber processing process for dyeing. But at present, the most widely used dyeing method is masterbatch coloring. It is a kind of chemical fiber dope coloring. After the dye (pigment) material is made into color masterbatch, it is mixed with colorless resin (plain granules or plain flakes) in a certain proportion and spun into colored fibers. Due to the use of color masterbatch products, there is no flying dust, and the working environment can be improved. Compared with other methods, it has the advantages of good color fastness, uniform color tone, bright color, complete color spectrum, low processing cost, and uniform post-dyeing. Therefore, , In recent years, the domestic production of carbon black masterbatch has developed very rapidly.

Among the various and colorful masterbatches, black masterbatches are especially favored by people. Masterbatch carbon black is widely used in the coloring of synthetic fibers and plastics. In the black masterbatch, a high concentration of carbon black colorant is usually added. This black masterbatch is combined with the plain particle to spin out the ideal black or gray filament. Fiber dyeing is usually carried out at a temperature of 250~300C. Since organic dyes are unstable at this temperature, carbon black is the most suitable. For some products that require high light fastness, color fastness, heat fastness and UV resistance stability, the method of mixing color masterbatch in chips for spinning or injecting dyes before feeding into screw extruder is mainly used. . Compared with other dyes, carbon black has good heat resistance, good distribution of pigment particles on the fiber cross section, and uniform dyeing.

Masterbatch coloring is widely used because of its better economic efficiency and flexibility. Masterbatch coloring polyester and polypropylene fiber black silk have also been greatly developed. Carbon black occupies an important position in the coloring of polyester melt masterbatch. Among the melt-colored polyester long fibers and staple fibers, black accounts for 70%. In addition, it also has a large number of applications in the coloring of polyamide fibers.

In addition to the application of conventional fiber dyeing, carbon black has important applications in the development of differentiated fibers and the treatment of recycled materials. Such as the colored polyester staple fibers and some black fine denier polyester DT yarns developed by Sinopec Yizheng Chemical Fiber Co., Ltd. Carbon black, on the other hand, can be used to process recycled material by making it into black or dark fibers.