Optical brightener 4BK-J is an optical brightener specially used for cellulose fibers. 4BK-J has a unique purple-blue hue that improves the whiteness of textiles while remaining highly compatible with a variety of processing conditions. This whitening agent is particularly effective in achieving bright white fabrics with a low environmental impact.
Main features and typical advantages:
1. Powder formula:
- 4BK-J is a yellow-green uniform powder that is easy to handle and can be integrated into textile processing systems. Powder form allows dosage control to ensure ideal results in whitening applications.
2. High whiteness and purple-blue tone:
- 4BK-J imparts high whiteness and subtle purple-blue tint to fabrics. This property enhances the aesthetics of textiles, making them more attractive to consumers.
3. High affinity:
- 4BK-J has a strong affinity for cellulose fibers and can effectively bond during the whitening process. This high affinity ensures that the brightener adheres well to the fabric, resulting in an even and consistent whitening effect.
4. Ideal brightening effect:
- This whitening agent has good whitening properties and can produce a cumulative whitening effect over multiple processing cycles. This property is particularly advantageous in production environments where textiles are processed repeatedly.
5. Good stability to alkali and peroxide:
- 4BK-J exhibits amazing stability when exposed to alkali and hydrogen peroxide, making it suitable for use in a variety of bleaching processes. This stability ensures that the whitener maintains its efficacy even under harsh processing conditions.
Product advantages:
1. Suitable for exhaust technology:
- 4BK-J is particularly effective in exhaust dyeing processes, achieving high bathroom exhaust rates while reducing wastewater contamination. This feature is in line with the growing demand for environmentally friendly textile processing solutions.
2. Good washing fastness:
- Fabrics treated with 4BK-J exhibit good wash fastness even at high temperatures. This durability ensures that the brightness and whiteness achieved during processing are maintained after multiple washes, thereby increasing product longevity and perceived quality.
3. Highlight whiteness:
- 4BK-J can provide high brightness and significantly enhance the visual appeal of textiles. The vivid whiteness achieved using this additive meets the stringent quality standards expected by consumers in today's market.
4. Suitable for continuous bleaching with hydrogen peroxide:
- This additive is very suitable for use in hydrogen peroxide discontinuous bleaching processes. Its compatibility with this method allows for effective whitening while ensuring fiber integrity.
Product performance:
1. Appearance:
- 4BK-J comes in a yellow-green uniform powder form, providing manufacturers with a visually unique and identifiable product.
2. Ionicity:
- The brightener is classified as an anionic product, which enhances its compatibility with other textile auxiliaries and dyes commonly used in textile processing.
3. UV absorbency:
- 4BK-J absorbs ultraviolet light in the 145-155 nm wavelength range, thereby increasing its effectiveness as an optical brightener. This absorption increases the fabric's reflectivity to UV rays, resulting in a brighter appearance.
4. pH stability:
- 4BK-J has a pH stability range of 6 to 12, making it suitable for a variety of processing environments. This stability ensures consistent performance under varying pH conditions.
5. Stability to hard water and bleach:
- The formulation maintains good stability in hard water up to approximately 25° Clark (20° German hardness). However, it is unstable in peroxide bleach, chlorite bleach, or chlorine bleach, which is a factor that must be considered when applying.
Product application:
Optical brightener 4BK-J is an ideal choice for the whitening process of cellulosic fibers (including cotton and its blended fabrics). Its high affinity makes it particularly effective in a variety of textile applications, such as:
- Exhaust process: It is very suitable for exhaust dyeing machines, where a high degree of bath exhaust is required to achieve effective whitening while reducing the impact on the environment.
- Continuous pad dyeing: It is suitable for continuous pad dyeing processes that require consistent overall whiteness of the fabric.
- Bleach application: Suitable for discontinuous bleaching processes using hydrogen peroxide, ensuring the desired whiteness is achieved while maintaining fiber integrity.