Explore our core product lineup featuring optimized formulations for textiles, paper mills, plastics, and specialized leather dyes. Click each product to request technical datasheets or sample kits directly from our factories.
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 always highly focus on the goods' quality and stability. Each shipment is rigorously tested before sending to the port. Our status as a certified provider holding ZDHC level 3 and GOTS certificates ensures your quality and eco-compliance are fully guaranteed.
We pride ourselves on offering customized solutions. Our team of experts works closely with clients to understand their unique color parameters and delivers tailored chemical formulations. We actively seek strategic partnerships to expand our global reach and enhance our specialized offerings. Collaborate with us to explore mutual growth opportunities and reliable supply chains.
Direct Black Ex (also known scientifically under the Color Index designation Direct Black 38) is a polyazo synthetic dyestuff valued globally for its intensive, deep-black hue and cost-effectiveness. The dye functions through direct substantive affinity to cellulosic substrates, drawing close to fibers through hydrogen bonding and Van der Waals forces. Understanding its structural chemistry and chemical behavior is vital for modern industrial procurement.
Unlike reactive dyes that form covalent bonds with cellulose, Direct Black Ex utilizes a flat molecular geometry that allows its large aromatic system to align parallel to the microfibrils of cotton, paper pulp, and regenerated cellulose (viscose). To maximize exhaust rates, electrochemical properties must be managed. Industrial dye baths utilize sodium chloride or sodium sulfate as electrolyte promoters. The addition of these salts neutralizes the negative surface charge of fibers in water, allowing the anionic dye molecules to diffuse smoothly into the amorphous regions of the fiber matrix.
For paper mills, Direct Black Ex is highly sought after due to its excellent affinity for bleached and unbleached kraft pulps. It shows minimal dependency on sizing agents, yielding high color intensity even in closed-loop water systems where dissolved organic compounds are present.
Cooperating with textile and paper mills for many years shows that the factory has established a strong and reliable business relationship. This kind of long-term collaboration brings numerous benefits, such as consistent orders, shared resources, and mutual support. It indicates that Sunrise Chem has a proven track record of delivering quality products and meeting the complex requirements of global partners.
Our mission is to drive business growth by providing reliable, stable, and customized chemical products. By integrating Factory 4.0 automation, we ensure that our synthesis parameters (such as temperature, pH levels, and raw material filtration) are monitored by computerized PLC units. This eliminates human error during critical azo-coupling phases. 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.
Global sourcing teams from diverse sectors require dyes that not only meet coloristic profiles but also comply with strict supply chain safety standards. Below is a breakdown of how our products serve key industries:
Designed for cotton yarns, linen, rayon, and blended fabrics. Our post-treatment cationic fixing agents improve wet fastness, washing fastness, and light durability, aligning with modern consumer apparel standards.
Provides high affinity for wood pulp fibers, ensuring uniform coverage without mottling. Ideal for cardboard, tissue paper, wrapping papers, and heavy industrial kraft cardboards.
Penetrates deep into the collagen fiber matrix of animal hides. Yields highly saturated jet-black leather for shoes, apparel, and furniture upholstery without surface cracking.
Environmental protection is the cornerstone of our innovation. At Tianjin Sunrise Chem Group, we dedicate ourselves to providing clients with eco-friendly, high-quality colorants that balance high performance with ecological safety. This commitment is reflected in our strict adherence to international chemical management certifications:
The ZDHC (Zero Discharge of Hazardous Chemicals) program is a collaborative effort by leading brands, retailers, and suppliers in the textile and footwear industry to eliminate hazardous chemical releases. Our Level 3 certification—the highest tier—proves that our formulations are thoroughly audited for MRSL compliance, ensuring zero hazard to workers and down-stream water bodies.
The Global Organic Textile Standard (GOTS) guarantees the organic status of textiles from harvesting raw materials to responsible manufacturing. GOTS certified products are sustainable, safe, and ethical. Our chemical inputs meet the strict toxicology and ecotoxicology criteria required for GOTS-compliant textile manufacturing.
We employ high-precision raw material purification and strictly control azo-reduction side-reactions. Our final products are guaranteed to have restricted aromatic amines (such as benzidine) well below the regulatory thresholds established by REACH (Annex XVII) and OEKO-TEX standard 100.
As global dye manufacturing transitions towards a circular economy, Tianjin Sunrise Chem Group is leading development with our three-stage technological roadmap:
By optimizing the synthesis process and using advanced reverse osmosis membrane technology, we significantly reduce the inorganic salt content in dye powders. Low-salt dyes require less electrolyte during the dyeing cycle, leading to cleaner wastewater streams for textile mills.
To resolve airborne dust and wetting issues in dye kitchens, we have developed stable liquid dye formulations. These liquid colorants are fully miscible with water, easy to dose automatically, and lower water consumption during preparation.
Our long-term R&D focuses on replacing coal-tar derived intermediates with bio-based alternatives. Our goal is to reduce carbon footprints while maintaining high color strength and shade consistency.
With decades of export experience, we have built strong partnerships in many countries. Our dedication to meeting global demands and exceeding customer expectations has earned us a reputation as a reliable partner worldwide. We support our international buyers through local warehouses, comprehensive compliance document packages (SDS, COA, REACH registration), and dedicated field technicians.
In addition to Direct Black Ex, we manufacture and export a wide selection of specialized colors. Check our secondary product lines for leather staining, fingerprint powder development, wool coloring, and paper pulp processing:
We not only produce and export dyes and pigments, but also prioritize long-term cooperation with our customers by offering logistics services that exceed expectations. Our factories feature modern loading docks, standardized palletization, and moisture-controlled warehousing systems designed to preserve dye chemical structures during long oceanic transits.
Access technical answers and troubleshooting tips for Direct Black Ex applications, color profiles, and eco-compliance questions compiled by Sunrise Chem Group's chemistry team.
Direct Black Ex features a solubility of approximately 50 grams per liter in soft water at 90°C. For industrial continuous processes, we recommend maintaining the dye bath water temperature above 60°C and using soft water with low calcium/magnesium hardness to prevent premature dye agglomeration.
We test each synthesized batch for regulated aromatic amines using gas chromatography-mass spectrometry (GC-MS). Our advanced purification processes wash away unreacted intermediates, maintaining hazardous chemical residues far below the standard limits. This compliance is verified by our ZDHC Level 3 and GOTS credentials.
Yes. Direct Black Ex is compatible with other direct yellow, blue, or brown dyes to create customized, cost-effective shades. To prevent color separation or uneven exhaustion, ensure all component dyes have similar affinity parameters and exhaustion rates at the selected salt concentrations and temperature profiles.
Using a cationic fixing agent or cross-linking resin after the dye bath is highly recommended. These agents form complex structures with the anionic sulfonic acid groups of the Direct Black Ex molecule, lowering its solubility inside the fiber matrix and improving washing fastness to meet international retail standards.
Review the remaining selection of our direct and acid colorants formulated for leather and paper mills. For custom chemical parameters or packaging sizes, please reach out to our team.
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