The emergence of disperse dye -alkaline dyeing:
When decentralized dye dyeing conventional polyester, the general dyeing bath is generally controlled (pH value is 5-6). Due to dyeing under acidic conditions, most of the scattered dye color light is the purest and high -dye rate. However, polyester simulation silk fabrics must be treated with alkaline reduction, so that the fiber surface can produce concave acupoints, which can make the feel feel soft, gloss, and hanging. It is still unavoidable to be alkaline, so a dispersion dyeing method of decentralized dye can appear. Disted dyes that can be dyed in alkaline baths are called alkaline dyeing dyes.
Second, the advantages of decentralized dye -alkaline dyeing:
The alkaline dyeing method has the advantages of effectively removing low polymers, shortening dyeing time, stable color light and saving energy.
1. Can further improve the refined effect:
Because there are more oil agents on the synthetic fiber, it is difficult to completely remove residual oil agents and pulp with existing refined methods, so it is easy to cause uneven dyeing or even color flowers. At the same time, adding alkaline uniform dyes, which has the effect of removing oil degeneration, can effectively improve the problem of insufficient washing in the pre -processing process, which is conducive to the rationality and simplification of the dyeing process.
2. It can prevent the re -attachment of alkaline reduction and dispersion residue:
The symbolic fabric is soft and high, and high quality is an ideal method to use intermittent alkali reduction. The higher the higher, if it is dyed in an acidic bath, the dispersion residue is easy to return to the color flower. When dyeing in an alkaline bath, its decomposition residue is soluble in the dye bath, which can prevent alkaline reduction of decentralized residual residue residual residues. Relax.
3. It can prevent the cohesion of low polymers:
There are some ring -shaped direct -chain low polymers in polyester. In the dyeing, these low polymers are transferred to the fiber surface, falling off into the dye bath, easy to condense and attached to the fabric or cylinder; Poems are soluble in alkaline solutions and will not cause dyeing quality problems.
4. It can improve the quality of dyeing products and the reproduction of dyeing:
When dyeing under acidic conditions, the surface of polyester fabrics is rough, and under alkaline conditions, it has a lubrication. Therefore, when dyeing in alkaline baths, wrinkles can be reduced in acidic dye baths. Bad, scratch marks and other problems, and can also give the dyed fabric soft feel, thereby improving the quality of dyeing products. At the same time, the application of alkaline dyeing agent has an excellent buffer ability in the pH value in the dye bath, so that the dye dyeing dye dye The post -pH value is basically the same, which is conducive to reducing cylinder differences and improving the reproducibility of dyeing.
Third, disadvantages of dispersion of alkaline dyeing dye:
Because the conventional decentralized dye structure contains ester, amino, cyanomy, etc., the dyes are easy to hydrolyze under neutral or alkaline conditions, resulting in dyeing light change and dye strength loss. Therefore, the alkaline conditions need to be screened with the dye.