Fluorescent Whitening Agent 4BK-J

Fluorescent Whitening Agent 4BK-J is a premium optical brightening agent specifically designed for cellulosic fibers. With its distinctive violet-blue shade, 4BK-J enhances the whiteness of textiles while maintaining a high level of compatibility with various processing conditions. This brightening agent is particularly effective in achieving brilliant white fabrics with minimal environmental impact.

Key Features and Typical Benefits

1. Powder Formulation: 
   - 4BK-J is available as a yellow-green uniform powder, making it easy to handle and integrate into textile processing systems. The powder form allows for precise dosage control, ensuring good results in whitening applications.

2. High Whiteness with Violet-Blue Shade: 
   - One of the most notable features of 4BK-J is its ability to impart a high level of whiteness with a subtle violet-blue shade. This characteristic enhances the aesthetic appeal of textiles, making them more attractive to consumers.

3. High Affinity: 
   - 4BK-J exhibits a strong affinity for cellulosic fibers, which enables effective bonding during the whitening process. This high affinity ensures that the brightening agent adheres well to the fabric, resulting in a uniform and consistent brightening effect.

4. Excellent Build-Up: 
   - The agent provides good build-up properties, allowing for cumulative brightening effects during multiple processing cycles. This feature is particularly beneficial in production environments where textiles undergo repeated treatments.

5. Good Stability to Alkali and Peroxide: 
   - 4BK-J demonstrates impressive stability when exposed to alkali and hydrogen peroxide, making it suitable for various bleaching processes. This stability ensures that the brightening agent maintains its effectiveness even in harsh processing conditions.

Benefits

1. Highly Suitable for Exhaust Processes: 
   - 4BK-J is particularly effective in exhaust dyeing processes, where it can achieve high bath exhaustion while minimizing wastewater pollution. This characteristic aligns with the growing demand for environmentally friendly textile processing solutions.

2. Excellent Washing Fastness: 
   - Fabrics treated with 4BK-J exhibit exceptional washing fastness, even at high temperatures. This durability ensures that the brightness and whiteness achieved during processing are preserved through multiple washes, enhancing the longevity and quality perception of the final product.

3. Very High and Brilliant White Maximum: 
   - 4BK-J is capable of delivering a very high and brilliant white maximum, significantly enhancing the visual appeal of textiles. The vibrant whiteness achieved with this agent meets the stringent quality standards expected by consumers in today's market.

4. Suitable for Discontinuous Bleaching with Hydrogen Peroxide: 
   - The agent is well-suited for use in discontinuous bleaching processes that involve hydrogen peroxide. Its compatibility with this method allows for effective whitening while ensuring the integrity of the fibers is maintained.

Properties

1. Appearance: 
   - 4BK-J is characterized as a yellow-green uniform powder, providing a visually distinct and recognizable product for manufacturers.

2. Ionicity: 
   - This brightening agent is classified as an anionic product, which enhances its compatibility with other textile auxiliaries and dyes commonly used in textile processing.

3. Ultraviolet Absorption: 
   - 4BK-J demonstrates ultraviolet absorption in the range of 145-155 nm, contributing to its effectiveness as an optical brightening agent. This absorption enhances the fabric's reflectivity to UV light, resulting in a more radiant appearance.

4. pH Stability: 
   - The pH stability of 4BK-J ranges from 6 to 12, allowing for versatility in various processing environments. This stability ensures consistent performance across different pH conditions.

5. Stability to Hard Water and Bleach: 
   - The agent maintains good stability in hard water, up to about 25° Clark (20° German hardness). However, it is not stable in the presence of peroxide bleach, chlorine bleach, or chlorine bleach, which is an essential consideration during application.

Applications

Fluorescent Whitening Agent 4BK-J is ideal for the whitening process of cellulosic fibers, including cotton and its blends. Its high affinity for these fibers makes it particularly effective in various textile applications, such as:

- Exhaust Processes: Perfect for exhaust dyeing machines, where high bath exhaustion is required for effective brightening with minimal environmental impact.

- Continuous Padding: Suitable for continuous padding processes where consistent whiteness is needed throughout the fabric.

- Bleaching Applications: Effective in discontinuous bleaching processes using hydrogen peroxide, ensuring that the integrity of the fibers is maintained while achieving the desired brightness.