Dye composition and dyeing method for elastic fabric

A dyeing method for an elastic fabric, comprising:

• (a) providing an elastic fabric including an elastic fiber;
• and
• (b) immersing the elastic fabric in a dye composition, the dye composition including an ion modifier and a dye, so that the elastic fiber of the elastic fabric contacts with the ion modifier and the dye;
• wherein, the elastic fiber has a first ion by contacting the ion modifier, the first ion has a first charge, the dye has a second ion, the second ion has a second charge opposite to the first charge, and the first ion of the elastic fiber and the second ion of the dye together form an ionic bonding to obtain a dyed elastic fabric;
• wherein the ion modifier includes an ionizable terminal group, and the ionizable terminal group is selected from the group consisting of:
• —SO3−, —HPO3−, —OPO32−, —PO32−, —NR3+, PR3+ and a combination thereof;
• wherein, R represents a substituted or unsubstituted aryl group or a substituted or unsubstituted alkyl group;
• wherein the dye includes a compound represented by the following chemical formula:
• A-B;
• wherein A is selected from the group consisting of:
• anthraquinone dye, naphthoquinone dye, pyrenequinone dye, triphenylmethane dye, xanthene dye, metal phthalocyanine dye, stilbene dye, nitroso dye, oxazine dye, dioxazine dye, pyrazolone dye and a combination thereof;
• wherein B is a SO3H group.