2-Naphthol-6-sulfonic acid sodium
2-Naphthol-6-sulfonic acid sodium (CAS: 135-76-2), known as Schaeffer’s salt, is a naphthalene-based intermediate combining a reactive naphthol hydroxyl with a sulfonate group that imparts water solubility. This white to off-white crystalline powder is a foundational building block in the dye industry, serving as a coupling component in the synthesis of a wide range of azo dyes including acid, direct, and reactive classes for textile coloration. The naphthol ring undergoes electrophilic substitution and azo coupling predominantly at the activated positions, producing dyes with excellent lightfastness and washfastness on cotton, wool, and nylon. Beyond dyes, it functions as an intermediate for pigments, optical brighteners, and specialty chemicals. Manufactured to consistent purity standards, Schaeffer’s salt supports reliable dye synthesis with predictable shade development and color yield across large-scale coloration operations.
– Azo Dye Synthesis: Used as a coupling component for diazonium salts in the manufacture of acid and direct dyes for textile, paper, and leather coloration.
– Reactive Dye Production: Serves as an intermediate for reactive dyes that form covalent bonds with cellulose fibers for superior washfastness.
– Pigment and Ink Manufacturing: Applied in the synthesis of organic pigments and colorants for printing inks, coatings, and plastics.
– Specialty Chemical Intermediates: Employed in the production of optical brighteners, tanning agents, and other naphthalene-based specialty products.
Product Name: 2-Naphthol-6-sulfonic acid sodium
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