Disodium 4,4'-bis(2-sulfostyryl)biphenyl

Product Details

CasNo： 27344-41-8

MF： C28H20Na2O6S2

Appearance： Granule

Delivery Time： 15 days

Packing： 25kg/bag

Purity： 90%

1. Basic Information

• English Name: Disodium 4,4'-bis(2-sulfostyryl)biphenyl; Fluorescent Brightener CBS-X
• Chinese Name: 4,4'- 双 (2 - 磺酸苯乙烯基) 联苯基二钠；荧光增白剂 CBS-X；荧光增白剂 351
• CAS Number: 27344-41-8
• Molecular Formula: C₂₈H₂₀Na₂O₆S₂
• Molecular Weight: 562.56 g/mol
• Common Synonyms: Fluorescent Brightener 351; CBS-X; Disodium 4,4'-bis[(E)-2-(2-sulfophenyl)ethenyl]biphenyl
• Appearance: Bright yellow-green granules or powder (high-quality products feature uniform particle size, no visible impurities, and consistent hue)

2. Physical and Chemical Properties

3. Key Performance Characteristics

1. High-Efficiency Whitening and Brightening
   The stilbene-biphenyl core structure enables strong UV absorption and targeted fluorescence emission, delivering:

• Whiteness Enhancement: Increases the whiteness index (ISO 105-J02) of cotton fabrics by 20%–30% and detergent powders by 15%–25% compared to untreated substrates, with long-lasting brightness retention.
• Tone Correction: Precisely emits blue-green fluorescence to neutralize yellowish tones in textiles, paper, and detergents, resulting in a "natural white" appearance rather than an artificial blue tint.

1. Excellent Durability and Process Adaptability

• Wash Fastness: For cotton fabrics treated with this product, whiteness retention rate exceeds 85% after 15 washes (per ISO 105-C10), outperforming low-cost fluorescent brighteners (e.g., VBL, which retains ~70% whiteness).
• Bleach Resistance: Maintains 90% of its brightening effect after 2-hour exposure to 0.5% sodium hypochlorite (25°C), making it suitable for chlorine-containing laundry detergents.
• Temperature Tolerance: Stable at processing temperatures up to 150°C, compatible with high-temperature manufacturing processes such as detergent spray drying and polyester fabric dyeing.

1. Environmental and Safety Advantages

• Biodegradability: Meets EU ECOLABEL requirements, with a 28-day biodegradation rate of ≥60% (OECD 301B), reducing environmental accumulation compared to non-biodegradable alternatives.
• Low Toxicity: Classified as low-toxicity; acute oral LD₅₀ (rat) >5,000 mg/kg, and skin irritation test (OECD 404) score ≤0.3 (10-point scale), safe for use in skin-contact products (e.g., soap, laundry detergents).

4. Main Application Fields

1. Detergent Industry (Core Scenario)

2. Textile Industry

• Natural Fibers (cotton, hemp): Added at 0.08%–0.2% in dyeing baths, enhances the whiteness of finished fabrics (e.g., bed sheets, clothing) without affecting fiber strength.
• Synthetic Fibers (polyester, nylon): Suitable for one-bath whitening processes of polyester-cotton blends, providing uniform brightness across different fiber components.
• Wool: Low-irritation formula avoids wool fiber damage, making it ideal for high-end woolen garment whitening.

3. Paper and Other Industries

• Paper: Added at 0.03%–0.1% in papermaking pulp, brightens white paper (copy paper, tissue) and improves print clarity by reducing yellowing.
• Plastics: Used in white plastic products (PP, PE) at 0.02%–0.05%, enhancing surface whiteness without altering plastic processing properties (e.g., melt flow rate).

5. Safety, Usage Guidelines & Storage

1. Safety Information

• Hazard Statements (per GHS):
  • H320: Causes eye irritation.
  • H402: Harmful to aquatic life.
• Precautionary Statements:
  • P264: Wash hands thoroughly after handling.
  • P273: Avoid release to the environment.
  • P305+P351+P338: IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing.
  • P337+P313: If eye irritation persists: Get medical advice/attention.
  • P501: Dispose of contents/container in accordance with local/regional/national/international regulations.

2. Usage Recommendations

• Dosing Method: For powder formulations, mix directly with other dry ingredients (e.g., detergent builders) for uniform dispersion; for liquid formulations, dissolve in warm water (50–70°C) first to form a stable solution, then add to the system.
• Avoid Overdosing: Excessive addition (>0.5%) may cause substrate "over-blueing" or reduced solubility, affecting product quality.

3. Packaging & Storage

• Packaging: 25 kg/fiber drum (inner polyethylene liner) for bulk orders; 1 kg/aluminum foil bag for small-batch trials; customizable packaging available upon request.
• Storage Conditions: Store in a cool, dry, well-ventilated warehouse (temperature 5–30°C, relative humidity <65%); avoid direct sunlight, moisture, and contact with strong acids/alkalis. Unopened products have a shelf life of 24 months.