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Weak Acid Black

Weak Acid Black: The Professional Dye Solution for Your Textile Needs

Weak Acid Black is a high-performance acid dye specially formulated for wool, silk, and nylon fabrics. With superior color fastness and excellent leveling properties, this dye has become the preferred choice for textile professionals worldwide.

Product Specifications

  • Chemical Type: Acid dye
  • Color Index: Acid Black 172
  • Appearance: Black powder
  • Solubility: Excellent in water
  • pH Range: 3.5-6.0 (optimal at 4.5-5.5)
  • Light Fastness: 5-6 (ISO 105-B02)
  • Wash Fastness: 4-5 (ISO 105-C06)
  • Rubbing Fastness: 4 (ISO 105-X12)
Recommended Dyeing Parameters
Parameter Wool Silk Nylon
Dyeing Temperature 95-100°C 85-90°C 95-98°C
Dyeing Time 45-60 min 60 min 45 min
Dye Concentration 0.1-5% owf 0.1-4% owf 0.1-3% owf
Liquor Ratio 1:10-1:20 1:15-1:25 1:10-1:15

FAQ About Weak Acid Black

What makes Weak Acid Black different from other black dyes?

Weak Acid Black stands out due to its superior exhaustion properties and excellent build-up characteristics. Unlike many black dyes that require multiple dips to achieve depth of shade, Weak Acid Black provides excellent color yield in single bath applications. The dye also offers remarkable compatibility with other weak acid dyes in combination shades.

How should I store Weak Acid Black for maximum shelf life?

Weak Acid Black should be stored in a cool, dry place away from direct sunlight. Keep containers tightly sealed when not in use to prevent moisture absorption. Under proper storage conditions, the dye maintains its quality for at least 24 months from the manufacturing date. Always store above floor level on pallets or shelves to prevent contamination from potential water damage.

What safety precautions should be taken when handling Weak Acid Black?

While Weak Acid Black is classified as non-hazardous under normal conditions of use, we recommend wearing appropriate PPE including dust masks when handling the powder form. Ensure good ventilation in the working area and avoid creating dust clouds. In case of eye contact, flush immediately with plenty of water for at least 15 minutes. For prolonged skin contact, wash thoroughly with soap and water.

Technical Advantages of Weak Acid Black

Performance Comparison
Property Weak Acid Black Standard Acid Black
Leveling Properties Excellent Good
Migration Superior Moderate
Coverage of Fiber Variations 95-98% 85-90%
Strike Rate Controlled Fast

Application Guidelines for Weak Acid Black

For best results with Weak Acid Black, follow these professional recommendations:

Pre-treatment

  • Scour fabric thoroughly to remove all natural and processing oils
  • Use a non-ionic detergent at 2-3% owf at 50°C for 20 minutes
  • Rinse thoroughly before dyeing

Dyeing Process

  1. Prepare dyebath at 40°C with:
    • 1-2 g/L leveling agent
    • 1-2% owf sodium sulfate (for wool)
    • pH adjuster to reach 4.5-5.5
  2. Circulate goods for 10 minutes
  3. Add pre-dissolved Weak Acid Black
  4. Raise temperature at 1°C/min to target temperature
  5. Hold for recommended time
  6. Cool to 70°C before draining

Aftertreatment

  • For maximum wet fastness, apply cationic fixing agent at 2-3% owf
  • Treat at 60°C for 20 minutes
  • Rinse thoroughly

Additional FAQ About Weak Acid Black

Can Weak Acid Black be used for printing applications?

Yes, Weak Acid Black can be successfully adapted for printing processes. For best results in printing applications, we recommend using the dye at 3-8% concentration in the print paste with appropriate thickeners (typically sodium alginate based). After printing, steam at 102°C for 20-30 minutes for proper fixation. The printed fabric should then be thoroughly washed to remove unfixed dye.

What is the recommended method for preparing Weak Acid Black stock solution?

For consistent results, prepare Weak Acid Black stock solutions as follows: Use distilled or deionized water heated to 50-60°C. Slowly add the dye powder while stirring continuously until completely dissolved. Strain through a 100-mesh filter before use. Typical stock solution concentration is 10g/L. The solution remains stable for up to 7 days when stored in light-resistant containers at room temperature.

How does Weak Acid Black perform in eco-friendly dyeing processes?

Weak Acid Black is particularly suitable for environmentally conscious dyeing operations. The dye achieves high exhaustion rates (typically 95-98%), minimizing effluent load. It's compatible with low-liquor ratio dyeing machines and requires less salt than conventional acid dyes. The product is free from restricted aromatic amines and heavy metals, complying with major international eco-standards including OEKO-TEX Standard 100 and REACH regulations.

Recommended Auxiliaries for Use with Weak Acid Black

Auxiliary Type Recommended Product Dosage Function
Leveling Agent Albatex W 1-2% owf Improves migration
Wetting Agent Invadine PBN 0.5-1 g/L Ensures even penetration
pH Buffer Ammonium Sulfate 1-3% owf Maintains optimal pH
Fixing Agent Sandofix WE 2-3% owf Improves wet fastness
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