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The impact and factors of the cationic dye dyeing

Views: 3     Author: Site Editor     Publish Time: 2023-01-03      Origin: Site

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The cationic dye has a large affinity for acrylic. When dyeing is fast, it spreads slowly due to fast adsorption, which is prone to dyeing uneven phenomenon. Once the dyeing is uneven, it is difficult to correct it by extending the dyeing time. When dyeing the cation dye, in order to obtain a uniform dyeing result, the upper dye rate should be appropriately reduced. The factors that affect the dyeing rate of yang ion dyes are in addition to the types of acrylics:

1. Temperature

Temperature is an important factor in controlling uniform dye. When acrylic dyeing with cationic dyes, there is very little dye below 75 ° C. When the vitrification temperature (75-85 ° C) of the dyeing temperature reaches the fiber, the upper dye rate of the dye increases rapidly. Therefore, when the vitrification temperature of the dyeing temperature reaches the fiber, the temperature should be slowly heated, generally the temperature of the temperature every 2 to 4 min L ℃. After 85-90 ° C for a period of time, the temperature and dyeing can continue to rise to boil.


2. Dyed bath pH value

Adding acid in the dye bath can inhibit the dissolution of acid groups in acrylic, reduce the number of anion groups on the fiber, reduce the gravitational gravity between dyes and fibers, and reduce the dyeing rate. The impact of the pH value on the upper dye rate is more significant with acrylics containing carboxylic acid -containing albumin, and the upper dye rate of acrylics containing sulfonine -based is less affected by the pH value of the dye bath. When dyeing, the pH value of the dye bath should be reasonably controlled. Cattea dye is generally not resistant to alkali. The best pH value of dyeing is generally 4-4.5. The pH value of the dyeing bath when dyeing is higher. When dyeing is light, it should be performed at a lower pH value. The pH value of the dyeing bath is generally adjusted with acetic acid. The acetic acid can not only reduce the pH value of the dye bath, but also improve the solubility of the dye. Add sodium acetate at the same time in the dyeing bath, which can stabilize the pH value of the dye bath within the scope of the required range.


3. Electrolysis

Add electrolytes to the dye bath, such as Yuanming powder, salt, etc., which can reduce the upper dye rate of cationic dyes and has a slowdown effect. The electrolyte has no obvious mild dyeing effect on the K value of 1 ~ 1.5, and has a mild dyeing effect on the d dyes with a K value of 3 ~ 5. The mild dyeing effect of electrolyte decreases with the impact of the dyeing temperature. When dyeing is light, the amount of electrolyte can be higher, about 5%to 10%(O.W.F.), And it can not be added when dyeing.


4. Slow dye

The sustaining agent is often added to the dye dye to reduce the upper dye rate and obtains a uniform dyeing effect. The sustained dyes of cationic dyes include cationic slowduts and anteropathic slow -in -dyes.

Catalized slow -dye is the most commonly used slow -dye dye in cation and dyeing. Most of them are cationic surfactants, such as 1227 surfactants (uniform dye TAN) and 1631 surfactants (uniform dyeing agent IV states). The cationic slowdler has affinity for acrylic. For the cationic slower with smaller molecular and smaller fiber, due to the fast spread rate, first occupy the dye seat on the fiber when dyeing. The affinity of affinity will gradually be replaced by dyes, which reduces the upper dye rate. The amount of such slowly dye should not be too large, otherwise the upper dye will be concentrated in the late storage period, which will cause uneven dyeing. For the complicated molecular structure and a greater affinity with the fiber, the cation -sung -dye can be bidded with cation dyes during dyeing, thereby reducing the upper dyeing rate of cedic dyes. As a result, the percentage of cationic dyeing is reduced. The higher the amount of sustained dyeing agent in this type of cation, the more significant the mild dyeing effect, but the dye is lighter. The dosage of cation ions depends on the nature and concentration of the dyes used. When the K value is small or dyed in light, the amount of sustained dyeing agent is high. The amount of slow dyeing agent is low. The cation with a mild dye also has saturated value for acrylic, and there is also a problem with the value of the cation dye. For cation with high affinity, cation with high affinity should be used. In the chromosomal prescription, the amount of the dyeing agent and cationic dye dye should not exceed the saturated value of the fiber.


In addition to the above -mentioned yang ion slowly dyeing agent, there is another type of cedic slow -dyed agent, that is, polymer cedic ion slowly dyeing agent, such as slow dye A. This type of mild dye molecules are large, with a degree of aggregation of hundreds. Each macromolecular contains hundreds of cationic groups. It cannot enter the inside of the fiber. It can only be covered on the fiber surface, making the codonic dye and the cublon of acrylic. Reduce the upper dye rate of dyes. This type of slow dye has a stronger dyeing ability than yang ionic surfactants, and does not occupy the dye seat in the fiber, which does not have an impact on the chromatal saturation value of acrylic. The aphrodisiac slowly dye is mostly a negatively charged aromatic sulfonic acid, which can be combined with cationic dyes into a complex with a low solubility. The dispersing effects of non -ionic auxiliary are suspended in the dye bath. The affinity is small. After adding an anion to the dyeing in the bath, the dye concentration of the ionic dye ion is reduced to reduce the upper dye rate of the dye. As the dyeing temperature is improved, the complex is gradually decomposed, and the free dye cation is released, which gradually increases the upper dye rate, thereby achieving the purpose of uniform dyeing. Due to the low solubility of the complex, in order to avoid precipitation, the non -ion -type surfactant is needed while adding an anteromal sustained dyeing agent. The decrease in the percentage of dye dyeing in the use of anion is obvious than that of cation with cation. After using anion -ion slowly dye, cation dyes and anion dyes can be stained with the same bath, creating conditions for the staining of the mixed ion dye/acid dye, the cationic dye/active dye for the mixed textiles of the acrylics.


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