Disperse turquoise blue S-GL dyeing, why is it so easy to "discolor"?

Only by understanding the properties of Disperse Turquoise Blue S-GL can you understand the influence factors of the dye itself on the color flower. Disperse turquoise blue S-GL (C.I. Disperse Blue 60), a typical anthraquinone structure disperse dye, its molecular formula is C20H17N3O5, molecular weight is 379.37, and the structural formula is as follows. It is green turquoise blue on polyester fiber.

The domestic one-component disperse Turquoise Blue S-GL usually refers to the above structure. Its molecular weight of 379.37 is not a large molecule in disperse dyes. It may be due to the anthraquinone ring structure and the good sublimation fastness of Turquoise Blue S-GL. Blue is a macromolecular disperse dye. As for the poor high-temperature dispersibility or level dyeing of the single-component dispersion of Turquoise Blue, it is caused by many reasons, and has nothing to do with its molecular weight. Some people say that the two-component dispersion Cuilan has good level dyeing properties. As for why, the author thinks that it includes dye application theory and dyeing theory, which is not clear in a few words. Welcome everyone to discuss. The quality of domestically produced two-component dispersed green orchid is also very good, and the quality is no different from Huntsman and DyStar.

Influence of dyeing water quality

The quality of dyeing water refers to the hardness and metal ions of the water.

For Disperse Turquoise S-GL, Mg2+ and Ca2+ in the water hardness index generally have a small effect on the dye shade, but when the concentration is high, it will also have an adverse effect on dyeing. Therefore, Turquoise is recommended to be used in the printing and dyeing process. soft water. Heavy metal ions in water often refer to copper, iron ions, etc., especially iron ions will darken the shade of Cuilan S-GL, while copper ions have little effect on the shade. In the printing and dyeing process, the iron element exists in the form: iron powder, rust, Fe2+, Fe3+, etc. The combination of rust and Fe3+ with dyes causes deviations in the shade of turquoise blue, while iron powder and Fe2+ not only combine with dyes to make turquoise deviations, but also In addition, printing and dyeing processing under acidic conditions promotes the production of iron powder and Fe2+ reducibility.

Effect of dyeing PH

Disperse turquoise blue S-GL related literature and the dyeing pH application range introduced in the dye index is 3-9, so why is it said that turquoise is more sensitive to pH? Generally, it is recommended to control pH for dyeing. There may be two reasons: 1 .The biggest feature of Cuilan is that the color and light are bright, the color of the bright color is slightly deviated, and the human vision is very obvious. Therefore, the requirements in the printing and dyeing process are relatively high; 2. The influence of iron ions, the overall economic cost, and the appropriate amount of pH Under narrow weak acid conditions, iron ions will not combine or aggregate with dyes, so it will not cause color blur or color aberration.

Dye selection and dyeing process control

Disperse Turquoise Blue S-GL is not suitable as the three primary colors. In the printing and dyeing industry, it is generally used to fight light water blue (matching color with Disperse Brilliant Blue 2BLN), brilliant green (matching color with light yellow 3G, 7G, fluorescent yellow 8G, 10G), Dark blue and green (brilliant blue 2BLN or green 6B, yellow 3G, 7G color matching), etc. The above-mentioned dyes can match the colors of Turquoise Blue, low temperature, medium temperature, and high temperature. The compatibility with Turquoise Blue is not ideal, but this kind of dyeing formula exists objectively.

The glass transition temperature of polyester fiber is 70-80℃. After reaching 80℃, disperse dyes start to dye, and the dyeing speed increases at 90℃, the fastest at 110℃, and it is most likely to produce colored flowers at 90～110℃. The measures taken by the dyeing factory control the heating rate within 1°C/min, and perform stage heat preservation at 90°C, 100°C, 110°C, and 120°C. Even so, there will still be problems such as color blur and chromatic aberration. Just think about why, except for the above-mentioned dyeing medium factors, above the glass transition temperature of polyester, the dyeing channel of the dye in the amorphous area of the polyester fiber has been opened, but each dye has its own characteristics and resistance to the external environment. Specifically, there are differences in the crystal morphology of the dye molecule, the structural characteristics of the dye, the solubility of the dye, the affinity of the dye to the fiber, the affinity between the dye and the dye, the binding force of the dye and the auxiliary, etc., and the dyeing speed is not synchronized or uniform. These are the microscopic factors that cause color blur and chromatic aberration. In the macroscopic view, it is shown as color, stain, chromatic aberration, layer aberration and so on.