Influence of dyeing water quality
The quality of dyeing water refers to the hardness of water and metal ions. For disperse Cuilan s-gl, Mg2 + and Ca2 + in the water hardness index have little effect on the dye color, but when the concentration is high, it will also have a bad effect on the dyeing. Therefore, it is suggested to use soft water in the dyeing process of Cuilan. Heavy metal ions in water often refer to copper, iron ions, etc., especially iron ions will make the color light of Cuilan s-gl darker, while copper ions have little effect on the color light. The existing forms of iron elements in printing and dyeing process are: iron powder, rust, Fe2 +, Fe3 +, etc. the combination of rust, Fe3 + and dye causes the deviation of the color light of Cuilan, while the combination of iron powder and Fe2 + not only causes the deviation of the color light of Cuilan, but also has certain reducibility, while the printing and dyeing process under acid conditions promotes the production of the reducibility of iron powder and Fe2 +.
Influence of dyeing pH
The applicable range of dyeing pH in disperse turquoise blue s-gl and dye index is 3-9, so why is it said that turquoise blue is more sensitive to pH? Generally speaking, it is suggested to control pH for dyeing, which may be due to two reasons: 1. The biggest characteristic of turquoise blue is bright color, a little deviation of bright color, and obvious human vision, so the requirements in dyeing and processing are relatively high; 2 With the influence of iron ions and the comprehensive economic cost, when the pH is appropriate under the condition of narrow weak acidity, iron ions will not combine or gather with the dye, so it will not cause the phenomenon of color flower and color difference.
Prevention methods:
1. Add metal ion chelating agent. For Fe2 +, Fe3 +, Cu2 +, the effective metal chelating agent containing EDTA or NTA can be selected in acid and neutral dye bath. For Mg2 + and Ca2 +, polycarboxylic acid metal chelating agent can be used. 2. The pH value of dyeing should be strictly controlled between 4.5-5.0, so that the ferric ion will not settle or combine with the dye. It is suggested to use glacial acetic acid + sodium acetate buffer system. 3. Add a proper amount of weak oxidant, and the dosage must be tested in laboratory first, such as sodium chlorate, anti dye salt s, etc.
2.Solution to color flower: boil it with oxalic acid 0.6g/l, 60 ℃× 20min (small test in laboratory is required).
3.Dye selection and dyeing process control
Disperse turquoise blue s-gl is not suitable for three primary colors. In the printing and dyeing industry, it is generally used to spell light Aqua Blue (with disperse brilliant blue 2BLN), brilliant green (with light yellow 3G, 7g, fluorescent yellow 8g, 10g), dark blue green (with brilliant blue 2BLN or green 6B, yellow 3G, 7G), etc. The above dyes and Cuilan color matching, low temperature, medium temperature, high temperature type, with Cuilan compatibility is not ideal, but this kind of dyeing formula is objective.
ITEM COM（O.M.F/%） ADDITIVES
LOW ＜0.3 Levelling agent
MIDD 0.3～1.5 Levelling agent，Dispersant
DARK ＞1.5 Dispersant
When the glass transition temperature of polyester fiber is 70-80 ℃, disperse dyes begin to dye when the temperature reaches 80 ℃, the dyeing speed is accelerated when the temperature reaches 90 ℃, the speed is the fastest when the temperature reaches 110 ℃, and the color flowers are most easily produced when the temperature is 90-110 ℃. The measures taken by the dyeing plant are to control the heating rate within 1 ℃ / min, and to conduct stage heat preservation at 90 ℃, 100 ℃, 110 ℃ and 120 ℃. Even so, there will be problems such as color flower and color difference. Think about why, except for the above-mentioned dyeing medium factors, the dye up channel in the amorphous area of polyester fiber has been opened above the glass transition temperature of polyester fiber, but each dye's own characteristics and external environmental resistance are not the same, specifically, the molecular crystal shape of dye, the structural characteristics of dye, the solubility of dye, the affinity of dye to fiber, dye There are differences in affinity with dyes and binding power between dyes and auxiliaries. The dyeing speed is not synchronous or even, which are the micro factors that cause color difference. On the macro level, they are color flower, color spot, color difference, layer difference, etc.
Improvement method: add proper leveler and dispersant to improve the dyeing asynchrony and high temperature dispersion stability.
It needs to be classified into the following three categories:
classification
There are a lot of dispersants in disperse Cuilan s-gl products. Is it necessary to add dispersants when dyeing? I think it is necessary to add dispersants with good high temperature stability, especially when dyeing Cuilan in heavy and compact fabrics or yarns, such as suede, zipper cloth, bobbin yarn, etc., so as to improve its dispersion at high temperature or prevent dye from re dyeing at high temperature Agglomeration is an important way to improve the color of Cuilan flowers.
Many technicians think that green flowers are easy to color, so strengthen the use of levelling agent, but they have already entered into the medium dark color, or even very dark color, and the dyeing depth refers to the total use of dyes. Improper addition of levelling agent not only has the problem of "achromatism", but also has the serious phenomenon of "dye agglomeration", which is a fatal factor for the production of Cuilan dyes.
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