Tianjin Sunrise Chem Group specializes in manufacturing high-quality dyestuffs, serving global industrial sectors with an expansive portfolio including Direct dyes, Acid dyes, Basic dyes, Sulphur dyes, Solvent dyes, Liquid dyes, and Fluorescent dyes.
Backed by decades of industry innovation and global export experience, we have built an unshakeable reputation for reliability and chemical excellence. Our clients span diverse sectors including denim finishing, high-fastness textiles, premium leather tanneries, paper mills, and industrial plastics.
We pride ourselves on providing customized OEM/ODM solutions. Our technical engineering team collaborates directly with global buyers to fine-tune dyestuff solubility, shade hue, fastness parameters, and physical form (powders, granules, or stabilized liquid preparations).
Sulphur Blue BRN (Color Index: C.I. Sulphur Blue 15 / C.I. 53235) represents one of the most commercially critical complex thionated dyestuffs used across modern textile processing. Chemically synthesized via high-temperature thionation of aromatic amino compounds (such as 4-(4-aminoanilino)phenol) with sodium polysulfides, Sulphur Blue BRN delivers an intense, reddish-blue to violet-shade appearance with exceptional affinity for cellulosic fibers.
In its native form, Sulphur Blue BRN powder is water-insoluble. To yield affinity for cotton, viscose, and blended fibers, the dye must undergo alkaline reduction (leuco transformation). Sodium sulfide ($Na_2S$) or eco-friendly reducing agents (such as glucose/hydrosulfite systems) cleave the disulfide linkages ($-S-S-$) within the dye molecule, producing water-soluble alkali-metal salt structures ($-S-Na$).
Upon exhaust or continuous padding application into the cellulosic matrix, the absorbed leuco-sulfur dye is re-oxidized using mild oxidants (hydrogen peroxide, sodium perborate, or atmospheric oxygen) to reform the high-molecular-weight insoluble pigment inside the fiber core. This locks the rich blue tone into the crystalline regions of the cellulose, delivering superior wash-fastness and light-fastness ratings.
| Technical Parameter | Standard Specification (Sulphur Blue BRN 150%) | Testing Method / Reference |
|---|---|---|
| Commercial Appearance | Dark Violet-Blue Granular Powder | Visual / ISO 105 |
| Shade Tone & Strength | 150% Standard (Customizable 100%-200%) | Spectrophotometric vs Standard |
| Water Solubility (Native) | Insoluble | Gravimetric |
| Solubility (Reduced State) | ≥ 80 g/L (Alkaline Na2S solution at 80°C) | ISO 105-Z09 |
| Light Fastness (Xenon Arc) | Grade 5 - 6 | ISO 105-B02 |
| Washing Fastness (95°C) | Grade 4 - 5 | ISO 105-C06 |
| Rubbing Fastness (Dry / Wet) | Dry: Grade 4-5 / Wet: Grade 3-4 | ISO 105-X12 |
| Free Sulfide Content | Controlled < 0.5% (Eco-grade) | Potentiometric Titration |
The global demand for Sulphur Blue BRN remains extraordinarily strong due to the expanding global denim and heavy-duty workwear markets. As textile manufacturing hubs shift dynamically across Asia-Pacific (China, India, Bangladesh, Vietnam, Pakistan) and Latin America (Brazil, Mexico), reliable OEM procurement of consistent sulphur dyes has become a strategic priority for tier-1 textile mills.
Sulphur Blue BRN serves as a foundational component for achieving dark navy, deep vintage blue, and bottoming shades under indigo indigo dyeings. Its unique wash-down properties allow fashion brands to create authentic distress effects via ozone, laser, and enzymes.
Workwear manufacturers in North America and Europe mandate strict light and laundering fastness. OEM formulations of Sulphur Blue BRN engineered by Tianjin Sunrise deliver superior wash endurance for military, industrial, and medical garments.
With volatile raw material prices for intermediate chemicals, Tianjin Sunrise maintains fully integrated backward supply chain security, offering global partners guaranteed pricing stability and year-round continuous volume supply.
The global dyestuff sector is undergoing a profound paradigm shift driven by stringent environmental regulations, decarbonization mandates, and strict brand MRSL (Manufacturing Restricted Substances List) compliance. The traditional sulphur dyeing process is being revolutionized through several key technological pathways:
Conventional sulphur dyeing relies heavily on sodium sulfide ($Na_2S$) and sodium hydrosulfide ($NaHS$), which can generate hazardous odor and elevated COD/sulfide levels in textile wastewater. Modern OEM advancements focus on pre-reduced liquid Sulphur Blue BRN formulations that utilize non-toxic organic reducing agents (e.g., reducing sugars, hydroxyacetone), dramatically cutting effluent sulfur loads by up to 85%.
To eliminate dusty mill environments and improve worker safety, high-grade Sulphur Blue BRN is now engineered as low-dusting, micro-granular particles. These dust-free granules dissolve rapidly and evenly in preparation tanks, minimizing air pollution and spill hazards in high-capacity dyeing plants.
Engineered low-temperature application processes for Sulphur Blue BRN allow exhaust dyeing at 75°C - 80°C instead of conventional 95°C cycles, reducing thermal energy requirements and lowering overall factory carbon footprints by up to 20%.
Cooperating with leading textile and paper mills worldwide, Tianjin Sunrise Chem Group has perfected application procedures for Sulphur Blue BRN across varying industrial environments:
Method: Continuous Slashing / Rope Dyeing.
Recipe: Sulphur Blue BRN (20-40 g/L), Na2S (1:1 ratio to dye), Soda Ash (3-5 g/L), Penetrating Agent (2 g/L).
Process: Dip and air-pass sequences at 80°C - 85°C. Oxidation with 2 g/L $H_2O_2$ at pH 9.5 yields deep navy bottoming with clean wash-down responsiveness.
Method: Winch / Jet Package Dyeing.
Recipe: Sulphur Blue BRN (3-6% o.w.f.), Reducing Agent (4-8 g/L), Salt ($Na_2SO_4$ 20-40 g/L).
Process: Raise bath temperature to 90°C over 30 mins, hold for 45 mins. Rinse cold, followed by mild acetic acid neutralization and perborate oxidation for optimal shade build-up.
Method: Mass Pulp Coloration in Beater / Hydrapulper.
Application: Adds rich violet-blue undertones to kraft paper, recycled paperboards, and specialty wrapping papers. Provides non-bleeding fastness under humid storage conditions.
Tianjin Sunrise Chem Group is committed to leading the dyestuff industry into a digital, automated, and hyper-sustainable future. Our ongoing research and development roadmap focuses on three technological pillars:
Environmental stewardship is the bedrock of Sunrise Chem Group's commercial expansion. Chemical inputs in global supply chains must align with zero-hazard commitments to protect ecosystems and urban communities.
Zero Liquid Discharge (ZLD) Compatibility: Our eco-engineered Sulphur Blue BRN formulations produce minimal bio-refractory organic byproducts, allowing textile finishing plants to seamlessly integrate biological oxidation, ultrafiltration, and reverse osmosis for 95%+ water recycling efficiency.
With years of export experience, we maintain automated manufacturing facilities, standardized warehousing protocols, and robust sea/rail logistics links worldwide. Below are snapshots of our global supply operations:
State-of-the-Art Sulphur Dye Warehouse
Stabilized Liquid Dyestuff Tanks
Bulk Export Container Loading
Global Shipping Dispatch Operations
Liquid Drum Logistics & Logistics
Quality Inspected Palletization
Beyond Sulphur Blue BRN, Tianjin Sunrise Chem Group delivers specialized colorants for diverse industrial applications:
Acid Red 14 Application for Leather
Acid Orange 7 Powder Silk & Wool
Acid Black ATT Yarn & Leather Dye
Acid Black 1 Powder Technical Dye
Sulphur Blue BRN 150% Violet Powder
Water Soluble Direct Yellow 86
Paper Coloring Dyes Direct Yellow R
Direct Yellow 12 For Paper Pulp
Iron Oxide Black 27 For Plastics
Crystal Nigrosine Acid Black 2
Acid Yellow 36 Textile Dyestuff
Acid Red 73 Textile & Leather Color
Acid Red 18 High-Fastness Dye
In partnership with global testing labs, ensuring full chemical compliance and ZDHC Level 3 MRSL conformance for modern textile processing.
Sunrise
