Engineered for high chemical stability, exceptional dispersion, and precise colorimetric requirements.
Tianjin Sunrise Chem Group specializes in manufacturing high-quality dyestuffs. Our comprehensive colorant portfolio includes Direct Dyes, Acid Dyes, Basic Dyes, Sulphur Dyes, Solvent Dyes, Liquid Dyes, and Fluorescent Dyes. Backed by decades of industrial manufacturing and export experience, we have built an international reputation for reliability and excellence, serving global enterprises across the denim, textile, leather, paper, and plastic sectors.
We consistently prioritize coloristic quality and chemical stability. Every single batch is strictly tested in our analytical laboratories prior to dispatching to the port. Our internationally recognized certifications, including ZDHC Level 3 and the Global Organic Textile Standard (GOTS), guarantee that your quality and regulatory compliance needs are fully met.
Cooperating with leading textile and paper mills for decades highlights our capacity to build strong, resilient, and reliable business partnerships. This sustained collaboration yields continuous optimization of chemical recipes, customized color strengths, and reliable cargo supply lines. We pride ourselves on offering bespoke colorant solutions, working dynamically to customize color shades and dry strengths to fit the targeted operational environments of our clients.
A comprehensive guide on structural characteristics, binding mechanics, and material interactions.
Direct Brown 2, chemically known under the Color Index formulation as C.I. Direct Brown 2 (C.I. 22311), and commonly designated in industrial sourcing as Direct Brown M or Direct Brown BGP, is an anionic disazo dye. It is highly valued for its intense color strength and affinity for cellulose substrates without the requirement of mordants. The chemical architecture comprises coupled azo linkages (-N=N-) stabilized by aromatic sulfonic acid sodium salt groups. This molecular structure determines its high water solubility and direct substantivity towards cellulose fibers, pulps, and proteinaceous materials.
The direct binding capability of Direct Brown 2 on cellulosic substrates like kraft pulp and cotton is driven by hydrogen bonding and Van der Waals interactions. In aqueous solutions, cellulose carries a negative surface charge, generating an electrostatic barrier. By introducing precise concentrations of electrolytes (such as anhydrous sodium sulfate or sodium chloride) during the dye process, the electrostatic repulsion is neutralized, allowing the dye molecules to align along the cellulose chains and lock into the fiber matrix.
Tianjin Sunrise Chem Group synthesizes Direct Brown 2 utilizing state-of-the-art diazotization and coupling reactions. Precise temperature controls (kept between 0-5°C during diazotization) and stabilization of pH parameters are maintained to minimize isomers and impurities. The raw material intermediate chains are continuously checked via high-performance liquid chromatography (HPLC) to ensure total conformance with international chemical safety limits, eliminating harmful primary aromatic amines from the final compound.
Why international procurement directors partner with Tianjin Sunrise Chem Group.
Sunrise Chem utilizes localized supply chains for key dye intermediates. This ensures consistent pricing, insulates manufacturing schedules from international raw material volatility, and guarantees year-round production continuity.
Our Tianjin plant implements computer-controlled synthesis reactors, ensuring precise batch-to-batch consistency. Advanced spectrophotometric checks limit batch variation to ΔE < 0.5, eliminating color drift in continuous production runs.
Unlike unstructured chemical processors, Sunrise Chem runs full-scale, advanced wastewater treatment systems. We are ZDHC Level 3 and GOTS certified, helping global brands meet strict environmental mandates.
Chinese manufacturing hubs, especially those located in northern coastal chemical economic zones like Tianjin, operate with unparalleled logistical efficiency. The proximity of Sunrise Chem to the **Tianjin Port** allows for rapid sea freight dispatches, reducing transit times to key textile and paper processing markets in Southeast Asia, the Middle East, Europe, and the Americas. By standardizing our dry powder and liquid formulations to meet strict international standards, we mitigate customs delay risks and streamline global trade workflows.
Tailored application engineering of Direct Brown 2 across distinct manufacturing sectors.
Direct Brown 2 is highly utilized within the pulp and paper industry, particularly in the production of brown kraft paper, testliners, corrugated boards, and recycled packaging cardboards. It possesses an exceptionally high retention rate on unbleached wood pulp, groundwood pulp, and wastepaper pulp.
Operational Parameters: The dye operates optimally under neutral to slightly acidic conditions (pH 6.0 to 7.0). Sizing agents like alum or rosin size act as secondary fixing agents, enhancing water resistance and color fastness. Because of its anionic charge, Sunrise Direct Brown 2 can be blended with Direct Yellow or Direct Black to achieve specific kraft brown target shades, maximizing color yield while keeping operational costs low.
Within the apparel and home textile industries, Direct Brown 2 provides deep, uniform coloration for cotton, rayon, viscose, flax, and blended fibers. It is commonly applied via exhaust dyeing and continuous padding methods.
Process Control: To achieve level dyeing, sodium chloride or anhydrous sodium sulfate must be added in increments at temperatures between 80°C and 95°C. This temperature window facilitates dye diffusion into the amorphous regions of the fiber, while subsequent cooling aids exhaustion. The wash and light fastness of dyed cotton fabrics can be significantly enhanced using post-dyeing cationic fixing agents or resin treatments.
For leather goods and timber finishes, Direct Brown 2 offers deep dye penetration and excellent leveling properties, making it an industry standard for upholstery and wood stain formulations.
Specialized Leather & Wood Systems: In chrome-tanned or vegetable-tanned leather processes, Direct Brown 2 penetrates deep into the collagen fiber matrix, masking surface imperfections and providing a rich, uniform undertone. In wood processing, the dye is formulated into water-borne or glycol-ether wood stains, highlighting wood grain patterns while providing protection against UV-induced color fading.
Environmental protection is the cornerstone of our innovation. We dedicate ourselves to providing clients with eco-friendly, high-quality colorants that balance productivity with environmental harmony, driving the industry towards a more sustainable development path while delivering high-performance products—for a greener textile industry and a sustainable future.
The ZDHC (Zero Discharge of Hazardous Chemicals) Program: This is a collaborative effort by leading global brands, retailers, and suppliers in the textile and footwear industry to reduce the release of hazardous chemicals throughout the supply chain. Achieving ZDHC Level 3 certification confirms that Sunrise Chem has implemented robust chemical management procedures and meets the most stringent requirements for chemical handling, wastewater treatment, and pollution prevention. This guarantees that our Direct Brown 2 formulations do not contain trace impurities of banned substances, protecting your brand from regulatory risk.
The Global Organic Textile Standard (GOTS): This certification ensures the organic status of textiles, from the harvesting of raw materials to environmentally and socially responsible manufacturing. The GOTS certification guarantees that our chemical inputs are minimized, safe, and ethical. This allows international manufacturers to confidently incorporate our dyes into organic-certified textile lines.
Our advanced warehouse management and logistics operations guarantee continuous global delivery.
We not only produce and export dyes and pigments but also prioritize long-term cooperation with our customers, providing services that exceed expectations. One of the main reasons customers choose us is the stable supply of dyes we provide. We have developed highly efficient manufacturing processes to ensure a continuous supply of our products. Our factories feature state-of-the-art equipment and a highly skilled workforce, enabling us to fulfill even the most demanding orders with short lead times.
Engineered for textile, pulp, paper, wood, and industrial coating sectors.
Highly effective anionic red dyestuff with deep grain penetration.
Brilliant leveling properties optimized for natural protein fibers.
Deep, jet-black performance with robust wash and rubbing fastness.
Specialized chemical dye utilizing optimal particle contrast features.
Excellent affinity for denim yarn warp dye continuous setups.
Brilliant yellow hues featuring high exhaustion curves and stability.
Cost-efficient formulation optimized for recycled kraft pulps.
Excellent dye retention with minimal bleed during wet press stages.
Heat-stable inorganic pigment with excellent dispersion properties.
Premium high-concentration crystal format for wood staining and inks.
Fast leveling yellow shade optimized for polyamide and wool blends.
Vibrant red tone designed for uniform coverage on leather crust.
A standardized framework for industrial dye chemical sourcing.
For international supply chain managers and chemical purchasing directors, procuring raw dyestuffs involves navigating strict regulatory and quality parameters. Tianjin Sunrise Chem Group simplifies this process through a structured Quality Assurance (QA) workflow that aligns with ISO 9001 and international chemical import guidelines.
Our products are packaged to withstand long-term sea transit and tropical warehousing conditions. Direct Brown 2 is supplied in robust 25kg iron drums, heavy-duty cardboard boxes, or customized jumbo bags. All packaging features internal moisture-barrier linings. When stored under cool, dry conditions with sealed bags, our dyes maintain color strength and chemical stability for up to 3 years.
We work closely with global logistics networks to offer flexible shipping options, including FOB Tianjin, CIF, and DDP configurations, ensuring seamless customs clearance at destination ports.
Addressing the technical, chemical, and logistics questions of industrial dye buyers.
Direct Brown 2 (color index designation C.I. Direct Brown 2, C.I. 22311) is a disazo-class dye. Historically, it corresponds to CAS Registry Number 3476-90-2. It features an anionic chemical structure containing sulfonic acid groups that yield high water solubility and allow direct bonding to cellulose fibers without the use of metallic mordants.
ZDHC (Zero Discharge of Hazardous Chemicals) Level 3 is the highest level of chemical compliance in the textile industry. It indicates that our chemical formulation processes are independently audited to ensure no banned substances or restricted amines are generated or released. This compliance protects international buyers from product recalls and regulatory violations.
The primary application sectors are paper coloring (kraft paperboard, corrugated boxes, recycled pulp), textile dyeing (cotton, rayon, viscose, flax fibers), and industrial surface treatments (leather grain penetration and wood staining). It is highly favored for its leveling properties and cost-effectiveness.
Our modern plant utilizes automated spectrophotometric analysis. Before any batch is approved for packaging, it is compared to standard retention samples. We limit color variation to ΔE < 0.5 and maintain dye strength deviation within a +/- 2% margin, ensuring consistent performance for continuous industrial processes.
Our standard configurations include 25kg iron drums, 25kg fiber drums, and customized cardboard cartons, all fitted with moisture-resistant inner PE liners. We also supply customized jumbo bags for large-scale operations. When stored in a cool, dry, ventilated warehouse, the shelf life exceeds 36 months without any loss of color strength.
Yes. We specialize in custom formulations, offering dye strengths ranging from standard grades to concentrated variants (150%, 200%). We also supply liquid versions of our dyes, which are highly stable, sediment-free, and ideal for automated liquid dosing systems in modern paper and textile mills.
High-affinity colorants engineered for global import requirements.
We firmly believe in building relationships with our clients based on trust and mutual benefit. We know that our customers' success is our success, so we are committed to providing quality services to meet their needs. Our dedicated customer support team is on hand to address any questions or concerns you may have. 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 best choice. With our extensive range of dyestuffs, coupled with our professional and customer-centric approach, we assure you that your decision to choose us as your preferred dyestuff factory will be a fruitful one. Contact us today and let's embark on a journey to success together.
Sunrise
