Direct Yellow 12
Direct Yellow 12 is a diazo dye commonly used for dyeing cellulosic fibers, offering good lightfastness and vibrant yellow hues.
Description
Direct Yellow 12, also known as Chrysophenine G, is an organic compound classified as a disazo direct dye. Its chemical formula is C34H28N6O8S2, with a CAS registry number of 6358-85-6. This dye is characterized by its molecular structure featuring two azo groups (-N=N-) linking aromatic components, which are sulfonated to enhance water solubility and affinity for cellulose. Direct Yellow 12 is synthesized through a diazo coupling reaction, initiating with the diazotization of a primary aromatic amine followed by coupling with a suitable component. The presence of sulfonate groups allows for strong hydrogen bonding and van der Waals interactions with cellulose fibers, facilitating excellent dye uptake without the need for mordants. It imparts bright, clean yellow shades with moderate to good lightfastness and wash fastnessdepending on application conditions. Its stability across various pH ranges makes it versatile for different dyeing processes. The quality of Direct Yellow 12 is often assessed by its color strength, hue, and solubility characteristics, ensuring consistent performance in industrial applications.
Applications
Direct Yellow 12 is predominantly utilized in the textile industry for dyeing cellulosic fibers such as cotton, linen, rayon, and viscose. It is also applied to paper pulp for coloring paper and cardboard products, contributing to a wide array of stationery and packaging. Furthermore, it finds use in the leather industry for dyeing finished articles, providing uniform and durable yellow coloration. Beyond traditional textile and paper applications, Direct Yellow 12 can be incorporated into certain inks and coatings where a stable, bright yellow pigment is required. Its direct application method simplifying the dyeing process makes it an economical choice for large-scale industrial operations across diverse manufacturing sectors reliant on colorants.
Storage & Handling
Store Direct Yellow 12 in a cool, dry, well-ventilated area away from direct sunlight and incompatible materials. Keep containers tightly closed. Avoid inhalation of dust and contact with skin or eyes. Use appropriate personal protective equipment during handling to prevent exposure.
Warning
- H319 Causes serious eye irritation
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