Sulphur Black (CAS 1326-82-5) is the most widely used Sulphur Dye In Textile for denim for jeans. It delivers deep black shades and excellent cost performance, making it the top choice for mass production of black denim and denim jeans across the industry jeans sector. However, yarn and fabric brittleness after dyeing is a common quality issue that causes strength loss, cracking, and powdery damage during storage.
Root Cause of Denim Brittleness
As a high-sulfur textile dye, Sulphur Black features unstable disulfide and polysulfide bonds. Under high temperature and humidity, the active polysulfide bonds on denim in jeans oxidize in air, producing sulfur oxides that react with moisture to generate sulfuric acid. This acid erodes cotton cellulose fibers, gradually destroying the fabric structure and leading to permanent brittleness.
Practical Anti-Brittleness Solutions
First, strictly control dye dosage. Excessive Sulphur Black leaves unreacted sulfur residues on black denim, raising oxidation risks and weakening color fastness. Second, conduct thorough multi-stage washing post-dyeing to remove floating color and residual impurities, cutting off acid-producing sources.
Third, apply professional anti-brittleness treatment with urea, soda ash and sodium acetate to neutralize acid substances and stabilize dye molecular structure. Fourth, adopt clean water boiling pretreatment for denim yarn to reduce brittleness compared with traditional lye treatment. Fifth, dry dyed denim for jeans timely to avoid damp stacking and pH value reduction.
Key Production Precautions
Never pack hot denim directly after drying; cool it naturally to room temperature to prevent heat accumulation from accelerating dye decomposition. Keep production and storage environments dry and ventilated to avoid oxidation. Maintain stable dye dosage, washing times and auxiliary dosage to ensure consistent batch quality.
In short, Sulphur Black (CAS 1326-82-5) brittleness is controllable. Standardized processing effectively solves denim jeans brittleness, stabilizing black denim quality for the jeans manufacturing industry.
Post time: Dec-28-2023