Discuss the factors affecting the color flower of Dispersed Cuilan S-GL: Only by knowing yourself and the enemy can you be invincible in every battle. Only by understanding the properties of Dispersed Cuilan S-GL can you understand the factors affecting the color flower of the dye itself. Disperse Blue S-GL (C.I.Disperse Blue 60) is a typical anthraquinone-type disperse dye with a molecular formula of C20H17N3O5 and a molecular weight of 379.37. The structural formula is as follows. It is green light on polyester fiber.
Domestic single-component dispersed turquoise blue S-GL usually refers to the above structure, with a molecular weight of 379.37 It is not considered a macromolecule among disperse dyes. Perhaps due to the anthraquinone ring structure and the good sublimation fastness of Cuilan S-GL, people think that Cuilan is a macromolecule disperse dye. As for the poor high-temperature dispersion or level dyeing properties of single-component dispersed green orchid, it is caused by many reasons and has nothing to do with its molecular weight. Some people say that the two-component dispersed green orchid has good level dyeing properties. As for why, the author believes that it includes dye application theory and dyeing theory, which cannot be explained clearly in a few words. Everyone is welcome to discuss. The quality of the domestic two-component dispersion Cuilan is also very good, which is no different from that of Huntsman and DyStar.
The influencing factors discussed in this article are based on good pre-treatment of polyester fiber or fabric.
1 The influence of dyeing water quality
The quality of dyeing water refers to Water hardness and metal ions. For Dispersed Cuilan S-GL, Mg2+ and Ca2+ in the water hardness index generally have little impact on the dye shade. However, when the concentration is high, it will also have adverse effects on dyeing. Therefore, it is recommended to use Cuilan during the printing and dyeing process. soft water. Heavy metal ions in water often refer to copper, iron ions, etc. Especially iron ions will make the color of Cuilan S-GL darker, while copper ions have less impact on the color. Iron elements in printing and dyeing processes exist in the following forms: iron powder, rust, Fe2+, Fe3+, etc. The combination of rust and Fe3+ with dyes causes the color deviation of Cuilan, while iron powder and Fe2+ not only combine with dyes to cause color deviation of Cuilan, but also have certain Reducibility, and printing and dyeing processing under acidic conditions also promotes the reduction of iron powder and Fe2+.
2 Effect of dyeing pH
Dispersed Emerald Blue S-GL The applicable range of dyeing pH described in relevant literature and dye index is 3 to 9. So why is Cuilan said to be more sensitive to pH? It is generally recommended to control the pH for dyeing. This may be due to two reasons: 1. The biggest characteristics of Cuilan The color is bright, and a slight deviation of the bright color will be obvious to human vision, so the requirements for printing and dyeing are relatively high; 2. The influence of iron ions and comprehensive economic costs, the pH should be adjusted to a narrow, weakly acidic condition , iron ions will not combine or aggregate with dyes, so they will not cause color flowers or color differences.
Prevention methods:
1. Add metal ion chelating agent. For Fe2+, Fe3+, and Cu2+, metal chelating agents containing EDTA or NTA that are effective in acid and neutral dye baths can be used. For Mg2+ and Ca2+, polycarboxylic acid metal chelating agents can generally be used. 2. Strictly control the dyeing pH value between 4.5-5.0 so that ferric ions will not settle or bind to the dye. It is recommended to use a glacial acetic acid + sodium acetate buffer system. 3. Add an appropriate amount of weak oxidizing agent, the dosage must be tested in the laboratory first, such as sodium chlorate, anti-staining salt S, etc.
Solution to colored flowers: boil with 0.6g/L oxalic acid at 60℃×20min (a small test in the laboratory is required).
3 Dye Selection and Dyeing Process Control
Dispersed Emerald Blue S-GL is not suitable as the three primary colors. In the printing and dyeing industry, it is generally used to combine light aqua blue (color matching with dispersed brilliant blue 2BLN), brilliant green (color matching with bright yellow 3G, 7G, fluorescent yellow 8G, 10G), dark blue-green (color matching) Brilliant blue 2BLN or green 6B, yellow 3G, 7G color matching), etc. The above dyes are available in low-temperature, medium-temperature, and high-temperature types for color matching with Cuilan. Their compatibility with Cuilan is not ideal, but such dyeing formulas exist objectively.
The glass transition temperature of polyester fiber is 70-80℃. After reaching 80℃, disperse dyes begin to dye. The dyeing speed accelerates at 90℃. The fastest speed is 110℃. 90 Colored flowers are most likely to occur at ~110°C. The measures taken by the dyeing factory are to control the heating rate within 1°C/min, and to maintain heat in stages at 90°C, 100°C, 110°C, and 120°C. Even so, problems such as color flowers and color differences may still occur. Just think about why. In addition to the above-mentioned dyeing medium factors, above the glass transition temperature of polyester, the dye dyeing channel in the amorphous area of the polyester fiber has been opened, but each dye has different characteristics and resistance to the external environment. Specifically, there are differences in the crystal morphology of dye molecules, the structural characteristics of dyes, the solubility of dyes, the affinity of dyes to fibers, the affinity between dyes, and the binding force between dyes and auxiliaries. The dyeing speed is not synchronous or uniform. These are the microscopic factors that cause color flowers and color differences. Macroscopically, it manifests as color flowers, color spots, color difference, layer difference, etc.
Improvement method: Add an appropriate amount of leveling agent and dispersant to improve the asynchrony of dyeing and high-temperature dispersion stability.
Two misunderstandings explained:
Dispersed Cuilan S-GL products already contain a large amount of dispersant, which is still necessary when dyeing.Should I add a dispersant? I think it is necessary to add a dispersant with good high temperature stability, especially when dyeing heavy and tight fabrics or yarns, such as suede, zipper cloth, cheese yarn, etc., to improve its performance. Dispersion under high temperature, or prevention of dye re-aggregation under high temperature, is an important method to improve the color of green orchid flowers.
Many technicians think that green is easy to color, so they increase the use of leveling agents. However, they do not know that they have already entered medium-dark or even extremely dark colors. The dyeing depth refers to the total color. Dye usage. Improper addition of leveling agent will not only cause the problem of “discoloration”, but also serious “dye aggregation”, which is a fatal factor for the color blooming of turquoise dyes. </p
