Existing problems: The biggest problem with the use of disperse dyes for the dyeing of polyester/spandex blends is the problem of reproducibility and color fastness. When polyester/spandex blended fabrics are dyed and finished, disperse dyes contaminated with spandex must be removed to meet the requirements of color fastness. Such stains are relatively easy to remove at present, such as the use of reducing agents and lye.
In addition to the problems of reproducibility and poor color fastness, disperse dyes have a large temperature dependence, pH dependence, etc., when dyeing polyester/spandex fibers; The degree of re-bleeding of the dye is also large, although the contamination has been removed, the color fastness will still decrease.
When dyeing polyester/spandex blends with disperse dyes, the following tendencies occur. When the temperature rises to approximately 100°C, most of the dyes are dyed on the spandex component, slowly starting from about 110-120°C to the polyester component. Transfer, dyeing.
Polyester/spandex blended dyeing also has the following problems: Considering the physical properties of spandex (embrittlement, etc.), there are more cases of dyeing at about 120°C. The use of dyes of a high temperature dyeing type has a problem of insufficient reproducibility due to insufficient dyeing of polyester fibers and various dyeing conditions, and a large shift in the dye distribution properties of polyester and spandex.
Improvement methods: Based on the premise of 120°C dyeing of polyester/spandex blends, the existing improvement measures for various problems can be concentrated on the following 3 points:
1. Suppression of spandex contamination of disperse dyes, so that the dyes are effectively dyed in polyester. In order to prevent the contamination of spandex and polyester, Kayaresister-UN can be added through a dye bath.
2. The use of disperse dyes that can take care of the reproducibility and color fastness of dyes, and excellent dyeing properties of polyesters at around 120°C as superior to temperature dependence. PH-dependent, post-finish resistant dyes can utilize Kayalon Polyester LW dyes.
3, when reducing the net washing, effectively remove the disperse dyes of the contaminated spandex, and use the Kayasoaper-URE which has excellent decontamination effect when reducing the net wash.
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