Method for dyeing ultra-black polyester fabrics

Abstract

The invention provides a method for dyeing ultra-black polyester fabrics. When the polyester fabrics undergoes scouring and wrinkling, the shrinkage ratio is controlled to be between 8 and 25 percent, and the pre-setting is performed at the temperature of between 170 and 220 DEG C for 20 to 60 seconds before alkali decrement; padding lye air steaming alkali decrement is adopted, and the alkali decrement rate of the polyester fabrics is between 8 and 26 percent; and the dyeing process formula of the polyester fabrics comprises 10 to 18 percent of dispersion liquid black at the concentration of 150 percent, 0.1 to 1.0 percent of dispersion emerald blue at the concentration of 200 percent and 0.5 to 2.5 percent of dyeing accelerant, wherein the dyeing accelerant is mixed by aromatic ester-type organic compounds and has the relative molecular mass of 140 to 380; and the pH value of dye liquor is adjusted to be between 4.5 to 5.5 by 0.2 to 1.5g / l acetic acid, and the polyester fabrics is dyed at the temperature of between 110 and 135 DEG C for 30 to 90 minutes. By adopting the technical scheme of the invention, the black polyester fabrics with high color depth and bright color can be dyed, and compared with the conventional black dyeing process, the black depth value of the black polyester fabrics is increased by over 16 percent by the method of the invention; and the test data obtained by the Datacolor instrument show the L value of the ultra-black polyester fabrics can reach 1.64.

Description

technical field [0001] The invention relates to a method for dyeing extra-black polyester fabrics, belonging to the field of textile printing and dyeing. Background technique [0002] Due to the high regularity of the chemical structure of the macromolecules of polyester fiber (called polyester in China), the macromolecular chains are arranged neatly, the degree of orientation is also high, and the degree of crystallinity is also large, so it is difficult for dyes to enter the amorphous region of the fiber; On the one hand, due to the presence of benzene rings on PET macromolecules and the lack of dyeing sites on PET macromolecules, it is difficult to dye. Therefore, the dyeing of polyester fabrics is usually done with disperse dyes under the conditions of high temperature and high pressure dyeing, hot melt dyeing or carrier dyeing. [0003] Polyester fabrics can be dyed into various conventional dark fabrics according to the above dyeing process, but if you want to dye spe...

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Problems solved by technology

[0003] Polyester fabrics can be dyed into various conventional dark fabrics according to the above dyeing process, but if you want to dye special black varieties that can meet the requirements of Arab countries, it is still difficult to use the current conventional dyeing process technology, although people have done more Many attempts have been made, such as adjusting the dyeing formula, increasing the dyeing temperature, prolonging the holding time, choosing mixed disperse dyes or increasing the amount of dyes, etc., but the improvement of the blackness of polyester fabrics is still very limited. After dyeing, the fabric is not black and the color is reddish. It looks relatively low-grade, and some black fabrics of composite silk give people a "white" visual effect. Even if the amount of dye is increased to more than 10% of the fabric weight during dyeing, there is no obvious effect. decrease in speed and increase in cost

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