Carriers, dispersants, and levelling agents u2014 benzyl alcohol, a naphthalene-sulfonate dispersant, and an ethoxylated-amine leveller, with ethylene glycol and acetic acid u2014 for even disperse dyeing of polyester and synthetic blends.
Disperse dye auxiliaries are the bath additives that let water-insoluble disperse dyes color polyester and other synthetic fibers evenly. They fall into three working roles: carriers (benzyl alcohol) that swell the hydrophobic fiber so dye can enter, dispersants (a naphthalene-sulfonate condensate) that keep dye particles suspended, and levelling agents (an ethoxylated fatty amine) that slow uptake for a uniform shade. A complete recipe usually needs all three plus pH control.
Polyester is glassy and hydrophobic, so dye diffuses slowly below about 130°C. A carrier such as benzyl alcohol lets a mill dye at atmospheric boil (~100°C) without a pressure vessel. The trade-off is honest: carriers add cost, odor, and effluent load, so high-temperature (HT) dyeing is preferred where pressure equipment exists. Reserve carriers for atmospheric beck or jig dyeing of polyester and PET/cotton blends.
Dispersant and pH control decide whether the shade comes out clean. The naphthalene-sulfonate dispersant prevents dye agglomeration and spotting; the ethoxylated-amine leveller and an acetic-acid addition hold the bath in its acidic working range (about pH 4.5-5.5) for even migration. Keep the bath in that band: off-spec pH shifts both shade and fastness, and ethylene glycol serves as a co-solvent and humectant in pad and continuous routes.
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