Overview
OH dyes are synthetic organic compounds characterized by hydroxyl (-OH) functional groups, which enhance their bonding affinity to substrates like cellulose fibers. They are widely used in industrial applications due to their vibrant hues and durability. These dyes fall under reactive dyes, forming covalent bonds with materials, ensuring long-lasting coloration. Their versatility makes them suitable for textiles, paper, and plastics, often preferred for eco-friendly formulations.
Physical and Chemical Properties
OH dyes typically exhibit high solubility in water, facilitating easy application in aqueous dyeing processes. Their chemical stability ensures resistance to fading under UV exposure and washing. Key properties include pH sensitivity, with optimal performance often in neutral to slightly alkaline conditions. Their molecular structure allows for modifications to achieve specific shades and fastness properties, catering to diverse industrial needs.
Main Applications
The textile industry is the primary consumer of OH dyes, especially for cotton, linen, and rayon. Their ability to bond chemically with fibers ensures wash-fast and rub-fast colors. In the paper industry, OH dyes provide uniform coloration for high-quality prints. They are also used in plastics to achieve consistent, non-migratory colors, particularly in packaging materials.
Safety and Storage
OH dyes should be handled with care, using gloves and masks to prevent skin contact or inhalation. Proper ventilation is essential during large-scale application. Store in tightly sealed containers away from moisture and direct sunlight to preserve stability. Shelf life varies but generally ranges from 1-2 years under ideal conditions.
B2B Procurement Guide
When sourcing OH dyes, prioritize suppliers with certifications like OEKO-TEX or REACH compliance to ensure safety and environmental standards. Request lab reports for colorfastness and solubility tests. Bulk buyers should negotiate pricing based on volume, with prices commonly ranging between $10-$50/kg. Sample testing is recommended to verify batch consistency before large orders.
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