Overview
Acid Black 2 is a synthetic azo dye belonging to the acid dye class, primarily used for dyeing protein-based fibers like wool and silk. Developed in the early 20th century, it remains a staple in textile industries due to its deep black hue and durability. The dye is chemically stable under acidic conditions, making it suitable for processes requiring low pH environments. As an anionic dye, Acid Black 2 bonds effectively with positively charged fiber groups, ensuring even coloration. Its versatility extends to nylon and leather, where it provides consistent results. Manufacturers often blend it with other acid dyes to achieve custom shades while maintaining cost efficiency.
Physical and Chemical Properties
Acid Black 2 appears as a dark brown to black powder with high solubility in water, forming a deep black solution. Its molecular structure includes sulfonic acid groups, which enhance water solubility and fiber affinity. The dye exhibits excellent stability in acidic baths (pH 2–6), a critical feature for textile applications. Lightfastness and washfastness are notable, with ratings of 4–5 on standardized scales, ensuring minimal fading over time. However, exposure to strong oxidizing agents can degrade the dye. Technicians must monitor dye bath temperatures, as excessive heat may reduce color yield.
Main Applications
The textile industry accounts for over 70% of Acid Black 2 consumption, particularly for woolen fabrics, silk garments, and nylon sportswear. Its ability to penetrate fibers uniformly makes it ideal for batch dyeing processes. Tanneries also use it for leather blackening, where it provides a rich, non-streaky finish. In niche applications, the dye serves as a colorant for inks and paper coatings. Recent innovations explore its use in hair dyes, though regulatory approvals vary by region. B2B buyers should confirm end-use compliance, especially for products exported to markets with strict chemical regulations like the EU or North America.
Safety and Storage
While not classified as highly toxic, Acid Black 2 requires careful handling to avoid respiratory or skin irritation. MSDS guidelines recommend using PPE (gloves, masks) during weighing and mixing. Spills should be contained with inert absorbents and disposed of as hazardous waste. Storage conditions are straightforward: keep containers tightly sealed in a dry, ventilated area at room temperature. Prolonged exposure to humidity may cause caking but won’t compromise efficacy. Bulk purchases should prioritize moisture-resistant packaging to extend shelf life beyond the standard 24 months.
B2B Procurement Guide
When sourcing Acid Black 2, prioritize suppliers with ISO 9001 certification to ensure consistent quality. Request batch-specific certificates of analysis (CoA) verifying purity (typically 95–98%) and heavy metal content. For textile applications, opt for dyes meeting OEKO-TEX Standard 100 to align with eco-label requirements. Pricing fluctuates with crude oil costs (as a petroleum derivative) and shipping logistics. Bulk orders (500+ kg) often secure discounts of 10–15%. Consider regional suppliers to reduce lead times; major producers operate in China, India, and Germany. Sample testing is advisable to confirm shade matching before large-scale procurement.
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