In the actual production of dyeing machine, emerald blue dyes will be widely used when bright green and blue varieties are combined. Turquoise blue reactive dyes are called sensitive colors because of their special molecular structure, especially when the dye dosage is more than 2.0 g / L.

Due to the high molecular weight and high directness of reactive turquoise blue dye, it is not easy to dye evenly, and it is easy to have color stains, color spots and color fastness.

The influencing factors of reactive turquoise blue dyeing are as follows

1. Dye factor

From the point of view of dyes, the amount of dyes, the amount of water-soluble groups in dyes (i.e. the solubility of dyes), the advantages and disadvantages of filling auxiliaries (dispersant, salt content, cosolvent) in dyes, and the size of molecular particles in the process of dye manufacturing all have a great influence on the dissolution, diffusion and leveling of dyes.

The unique macromolecular structure of reactive turquoise blue results in its high molecular planarity, so it has a high direct adsorption on the fiber, but the high direct will cause the phenomenon of difficult leveling and color blooming; at the same time, the high direct will also bring the defects of unstable shade and poor color fastness, and the subsequent soaping will further affect the shade and color fastness.

On the other hand, due to the large molecular group of reactive turquoise blue, its solubility is not good, and it is easy to associate between molecules to form color stains; especially in the presence of neutral electrolyte, the solubility and diffusion performance of the dye will further decline, and the dye will precipitate in the form of multiple molecular association, resulting in obvious color stains.

2. Influence of additives

2.1 salt (neutral electrolyte)

Sodium ion has a great influence on the dyeing process of reactive turquoise blue. When the content of sodium ion is lower than a certain range, the promotion effect is not enough, which will lead to low final absorption color yield, unstable shade and poor reproducibility; when the content of sodium ion reaches a certain range, its molecular movement is not hindered, which can drive the reactive turquoise blue dye molecules to uniformly diffuse in the aqueous solution and play a role in promoting the dyeing; but with the further increase of the content of sodium ion, the dyeing effect is not good It is difficult to disperse evenly and salting out easily to form color spots and flowers. Therefore, the usage and dosage of sodium sulfate are very important for the dyeing of reactive turquoise blue.

2.2 alkali agent

Sodium carbonate, a commonly used alkali agent, has both fixing and promoting effects on the dyeing of reactive turquoise blue because it contains sodium ions.

Due to the high directness of reactive turquoise blue, the promoting ability of alkali agent is very weak. However, when the dosage of alkali agent is 0.5-1.0 g / L, the phenomenon of color blooming can be alleviated.

In addition, because sodium carbonate can cause the hydrolysis of dyes, and has a great impact on the stability of shade and fastness, it is suggested that the alkali adding time should be controlled properly, not too long.

2.3 solubilizing and diffusing additives

For the auxiliaries of reactive turquoise blue dyeing, they should have the properties of solubilization and diffusion, and should have the function of slowing down the adsorption.

A certain amount of dispersant can help the dye dissolve and achieve the function of solubilization and diffusion; but on the other hand, due to its outstanding solubilization and diffusion, the dye is not easy to dye the adsorptive fiber, and the color light is lighter (generally about half of the depth).

Therefore, the usage and amount of cosolvent need to be controlled according to the amount of dye and dyeing conditions. In addition, if there are color stains on the fabric before adding alkali, the requirements for the emulsifying or diffusing properties of the auxiliaries will be higher when the auxiliaries are used for leveling, and the high temperature leveling method can be selected by directly adding degreaser or low foam emulsifier.

3 water quality impact

Activated turquoise blue is sensitive to water quality, and the hardness of water should be controlled below 50 mg / L. if the hardness of water is too high, it is easy to produce color flower phenomenon.

4 temperature effect

The reaction temperature of reactive turquoise blue dye is generally between 75 ℃ and 80 ℃, and the leveling temperature is between 80 ℃ and 90 ℃.

This is because the high temperature will make the dye molecules move violently, which is conducive to the uniform diffusion of the dye; but if the temperature is too high, the hydrolysis of reactive turquoise blue dye will also intensify, especially when it is mixed with other dyes, it will have a greater impact on other dyes, and the shade is unstable. At this time, the leveling temperature should be selected according to the actual mixing situation, and the leveling time should be extended and the leveling agent should be added To achieve the purpose of level dyeing. After leveled dyeing, the temperature was reduced to 80 ℃, and then the fixation reaction was carried out after adding alkali.