The molecular structure of the disperse dyes of the original vinegar fiber was relatively small. Later, polyester was introduced, especially the dyeing equipment of polyester was continuously improved, especially the appearance of high temperature and high pressure jet overflow dyeing machine, which made the disperse dyes have low temperature type (E) and medium temperature type. (SE) and high temperature type (S or H), mainly used in the dyeing of vinegar fabrics.
Specifically, the medium/low temperature type is more suitable for dyeing vinegar fabrics. The dyeing of vinegar fiber by disperse dyes has a certain amount. When the dyeing depth reaches saturation, the dye in the dye liquor is difficult to absorb, and the vinegar fiber can not be dyed at high temperature. Therefore, when dyeing dark color, it is better to use dyes with different chemical structures and similar color shades to dye and dye, and the effect will be improved. This is mainly to increase the color of the vinegar fiber by utilizing the additive nature of the disperse dye. Sometimes it is not unreasonable to use high-temperature disperse dyes in order to adjust the color shade, but it must be primary or secondary. Because vinegar fiber fabrics can only be dyed between 80 and 95 ° C, the disperse dyes with large molecular structure will undoubtedly have the disadvantages of low dyeing rate, serious floating color and poor wet processing fastness.