In the contemporary global chemical market, Direct Black 22 (CAS No. 6473-13-8) stands out as one of the most critical polyazo dyestuffs. Widely utilized due to its excellent substantive properties, this dye serves as a foundational component in the textile, paper, and leather processing sectors. As global supply chains face volatile raw material costs and shifting regulatory policies, sourcing from a reliable factory that offers high-performance products at discount prices is crucial for maintaining a competitive edge.
Historically, the supply of direct black dyes was fragmented. Modern industrial applications require consistent color yields, excellent solubility, and compliance with strict ecological regulations. Globally, the demand for Direct Black 22 is driven by emerging textile economies in Asia, South America, and parts of Europe, where manufacturers require robust dye formulations that minimize water usage and chemical auxiliary additives. The integration of high-affinity dyes like Direct Black 22 is key to reducing resource consumption while achieving deep, stable black shades on cellulose-containing substrates.
The chemical synthesis of Direct Black 22 is a complex, multi-stage diazotization and coupling process. Starting from basic aromatic intermediates, the reaction demands strict kinetic and thermodynamic controls to prevent the formation of unwanted side isomers. High-tier manufacturers optimize this synthesis pathway using automated dosing systems, maintaining temperature margins of 0-5°C during the diazotization of aromatic amines, followed by controlled pH adjustments during the coupling of H-acid (1-amino-8-naphthol-3,6-disulfonic acid) and aniline derivatives.
Desalting represents another critical phase in technical synthesis. Naturally occurring salts (primarily NaCl and Na2SO4) formed during neutralization must be controlled. Modern factories utilize reverse osmosis and ultrafiltration membranes to reduce salt levels. This desalinated dye formulation provides high solubility (exceeding 50 g/L), reduces clogging in automated color dispensing systems, and ensures consistent batch-to-batch color yield. Research is also focused on developing water-based liquid formulations of Direct Black 22, reducing dust hazards and enabling automated handling in modern dye houses.
Direct Black 22 exhibits strong substantive affinity to cellulosic structures. It is applied in exhaust dyeing processes at temperatures ranging from 90°C to 95°C. The dye penetrates deep into cotton fibers, forming hydrogen bonds and Van der Waals forces. When paired with modern cationic fixing agents, it yields a rich, wash-fast black shade without requiring heavy metal mordants.
In the paper industry, Direct Black 22 is widely used for coloring kraft paper, cardboard, and decorative tissues. It can be added directly to the pulp slurry before sheet formation. Its strong binding affinity to cellulose fibers results in high retention rates and minimal color run-off in wastewater systems, leading to cleaner operations.
During chrome-tanned leather drum dyeing, Direct Black 22 provides excellent penetration and leveling properties across both the grain and corium layers. It delivers an intense, non-bronzing black finish with good lightfastness, meeting global performance standards for footwear and upholstery leather.
Tianjin Sunrise Chem Group specializes in manufacturing high-quality dyestuffs, including Direct dyes, Acid dyes, Basic dyes, Sulphur dyes, Solvent dyes, Liquid dyes, and Fluorescent dyes. Backed by decades of industry and export experience, we have built a reputation for reliability and excellence, serving clients from diverse sectors including denim, textile, leather, paper, and plastic.
We focus closely on product quality and stability. Each shipment is thoroughly tested before sending to the port. ZDHC Level 3 and GOTS certifications guarantee the quality and compliance of our products. We pride ourselves on offering customized solutions, working closely with clients to understand their needs and deliver tailored colorant formulations. We actively seek strategic partnerships to expand our reach and enhance our product offerings.
Environmental protection is the cornerstone of our innovation. We dedicate ourselves to providing eco-friendly, high-quality colorants that balance productivity with environmental harmony, driving the industry towards a more sustainable development path for a greener textile industry and a sustainable future.
The manufacturing capabilities of Chinese dye factories provide unique supply chain advantages. By leveraging complete upstream-to-downstream chemical clusters, manufacturers secure key intermediate chemicals domestically, mitigating international logistics disruptions. The close proximity of production hubs to major ports like Tianjin ensures rapid transit times and reduced freight costs.
Cooperating with textile and paper mills for many years shows that the factory has established strong and reliable business relationships. This kind of long-term collaboration brings numerous benefits, such as consistent orders, shared resources, and mutual support. It also indicates that the factory has a good track record of delivering quality products and meeting the needs of its partners. Our mission is to drive business growth by providing reliable and customized products. Our goal is to make a significant contribution to our customers' success by consistently delivering first-class products and exceptional customer service. By building lasting partnerships, we strive to be a catalyst for our clients' success.
With years of experience, we have successfully established strong partnerships in many countries. Our dedication to meeting global demands and exceeding customer expectations has earned us a reputation as a reliable supplier worldwide. If you are looking for reliable, high-quality Dyes, we invite you to choose us as your trusted partner.
| Parameter | Specification Value | Test Methodology / Standard |
|---|---|---|
| Color Index Name | C.I. Direct Black 22 | International Color Index |
| CAS Registry Number | 6473-13-8 | Chemical Abstracts Service |
| Chemical Structure | Polyazo Dyestuff Class | Spectrophotometric Verification |
| Physical Appearance | Uniform Black Powder / Stabilized Liquid | Visual Assessment |
| Water Solubility | ≥ 50 g/L (at 80°C) | Gravimetric Method |
| pH Range (1% solution) | 7.5 – 9.0 | Electrometric pH Meter |
| Heavy Metal Content | Complies with ETAD guidelines (Pb, Cd, Hg < 10ppm) | ICP-OES Analysis |
| Certifications | ZDHC Level 3, GOTS Certified | Third-Party Lab Certification Audit |
Direct Black 22 is a polyazo dyestuff featuring a larger molecular structure designed for direct substantivity to cellulose via hydrogen bonding and Van der Waals forces, requiring no mordants. In contrast, Acid Black 1 is a diazo dye designed primarily for protein fibers (such as wool and silk) or polyamide (nylon) under acidic dye bath conditions, relying on ionic bonding. Direct Black 22 has a higher affinity for cotton and paper pulp.
ZDHC Level 3 is the highest compliance level under the Zero Discharge of Hazardous Chemicals program. It certifies that the manufacturing processes do not use restricted chemical substances, ensuring that the finished dyes comply with strict international environmental regulations. This simplifies the import process for global brands sourcing for markets with strict ecotoxicological requirements, such as the EU and North America.
At Tianjin Sunrise Chem Group, we utilize high-precision computer spectrophotometers to analyze the color strength and shade of every production run. We adjust parameters during synthesis and standardization phases to keep shade deviation within a Delta E value of less than 0.5. Each shipment is tested before dispatch to guarantee consistency across orders.
Yes. We offer customized liquid formulations of Direct Black 22. Liquid dyes are preferred in modern automated mills because they prevent dust pollution, dissolve rapidly, and work seamlessly with automatic dosing systems. Our liquid dyes are formulated with specialized stabilizers to prevent sedimentation and extend shelf life.
Our standard packaging includes 25kg multi-layer kraft paper bags, 25kg fiber drums, or customized jumbo bags. Dyes should be stored in a cool, dry, and well-ventilated warehouse, away from direct sunlight, moisture, and incompatible substances such as strong oxidizing agents.
We believe in building relationships with our clients based on trust and mutual benefit. Because our customers' success is our success, we are committed to providing quality services to meet their needs. Our dedicated customer support team is available to address your questions and concerns. We value your feedback and strive to continuously improve our operations to serve you better. Our purpose is not just to supply dyes, but to be your trusted partner in achieving your business goals. By choosing us, you choose a partnership built on reliability, transparency, and mutual success.
In short, when choosing a dye factory with a stable supply, high quality, and excellent service, we are your partner of choice. With our extensive range of dyestuffs, coupled with our professional and customer-centric approach, we are committed to making your decision to choose us a fruitful one. Contact us today to discuss your requirements.
Our experienced technicians monitor the manufacturing process, ensuring that each batch of dyes is tested for colorfastness, durability, and other essential parameters. By choosing us, you can trust that your products will stand out in the market due to the vibrant and long-lasting color our dyes provide.
Our quality assurance system tracks production from raw materials to final packaging. By utilizing chromatography and spectrophotometry, we maintain tight control over dye purity, shade consistency, and chemical compliance, meeting international regulatory requirements.
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