What is CBS-L?

Fluorescent whitening agent CBS-L is a stilbene biphenyl type optical fluorescent whitening

agent, which is the most excellent fluorescent whitening agent for detergents and textile. It can be mixed

in any proportion of water. It has good whitening effect on cellulose fiber, polyamide and

protein fiber at room temperature, and is suitable for high temperature padding. It also has 

good whitening effect on paper. Non-toxic, non-corrosive, no dust pollution, easy to use,

suitable for continuous production. It has extremely high stability to sodium hypochlorite and is

a bleach-resistant fluorescent whitening agent.

CBS-L technical data 

Main Component:Stilbene derivatives

MOLECULAR FORMULA：C₂₈H₂₀S₂O₆Na₂

MOLECULAR WEIGHT：562.56(As International relative Atom Mass 2013)

EXCUTIVE STANDARD：HG/T 5323-2018

SPECIFICATIONS：

CBS-L APPLICATION：    

It is suitable for washing detergents such as liquid detergents, soaps, soaps, etc. 

It can also be directly used for optical whitening at room temperature of cotton, hemp, silk, wool, nylon and nylon.

Optical Brightener CBS-L for detergent.

Fluorescent whitening agent CBS-L is a stilbene biphenyl type optical fluorescent whitening agent, which is the most excellent fluorescent whitening agent for detergents. It can be mixed in any proportion of water. It has good whitening effect on cellulose fiber, polyamide and protein fiber at room temperature, and is suitable for high temperature padding. It also has good whitening effect on paper. Non-toxic, non-corrosive, no dust pollution, easy to use, suitable for continuous production. It has extremely high stability to sodium hypochlorite and is a bleach-resistant fluorescent whitening agent.

Primary Applications in Specific Products

CBS-L is widely used in various detergent products to enhance whiteness and brighten colors due to its excellent compatibility and stability.

Usage Instructions & Dosage

Method of Use:

1. Addition Point: It should be added during the late stage of production, typically during the cooling phase or the homogenization stage.

2. Process Requirements:

• Temperature: It is recommended to add it at temperatures below 50°C to prevent thermal degradation or discoloration.

• Dispersion: Being a liquid, CBS-L  is easy to disperse in water-based systems. It can usually be added slowly with moderate stirring to ensure a homogeneous mix.

• Compatibility Test: Before using it in a new formulation, it is essential to conduct a small-scale lab test to ensure compatibility with other components (e.g., surfactants, enzymes, fragrances) and to avoid precipitation, flocculation, or discoloration.

Recommended Dosage:
The dosage of CBS-L  should be adjusted based on the specific formulation and the desired whitening effect. The general reference range is:

• General Range: 0.05% - 0.3% (by total weight of the detergent product).

• Specific Recommendations:

• Standard Liquid/Powder Detergent: 0.05% - 0.15%

• High-Efficiency Concentrated or Premium Whitening Liquids: 0.1% - 0.3%

• Soap-Based Products: 0.05% - 0.1%

  
  

Optical Brightener CBS-L for textile.




Optical Brightener CBS-L is suitable for the whitening treatment of nylon 6, nylon 66 fibers, and their blends with cellulose fibers.

• Application Methods

  1. Exhaustion Process

  Dosage: 0.6 - 5.0% (o.w.f)

  pH Value: 4 - 6

  Bath Ratio: 1:5 - 20

• Temperature:

  Nylon 6: 70 - 110°C

  Nylon 66: 90 - 110°C

• Duration: 20 - 40 minutes

  2. Continuous Process

• Thermosol Process

  Nylon 6: 190°C for 20 seconds

  Nylon 66: 200°C for 20 seconds

  Pad Liquor Concentration: 5 - 40 g/L

  Thermosoling:

• Pad-Steam Process

  Pad Liquor Concentration: 1 - 40 g/L

  Padding → Steaming: Saturated steam at 102°C for 3-5 minutes → Rinsing.

FAQ

1. What is Optical Brightener CBS-L?
Optical Brightener CBS-L is a fluorescent whitening agent used to enhance the brightness and whiteness of fabrics and detergents. It works by absorbing invisible ultraviolet light and re-emitting it as visible blue light, making materials appear whiter and cleaner.

2. What is the chemical composition of CBS-L?
CBS-L belongs to the stilbene derivative family. Its chemical name is Disodium 4,4'-bis(2-sulfostyryl)biphenyl, and it is highly soluble in water with excellent stability in alkaline solutions.

3. What are the main applications of Optical Brightener CBS-L?
It is widely used in laundry detergents, textile whitening, paper brightening, and synthetic fiber treatment.

4. Why is CBS-L suitable for detergents?
CBS-L remains stable and effective under strong alkaline conditions and high temperatures. It enhances fabric whiteness even after multiple washes.

5. Is CBS-L suitable for both powder and liquid detergents?
Yes. CBS-L has good compatibility with both powder and liquid detergent formulations, ensuring uniform brightness in all washing conditions.

6. Can CBS-L be used in textile dyeing and finishing?
Yes, it is ideal for cotton, polyester, nylon, and blended fabrics. It can be added during the washing or finishing stage to improve the fabric’s brightness.

7. What is the recommended dosage for CBS-L?
For detergents, the typical dosage is 0.05%–0.3%. For textiles, 0.05–0.2% based on the dry weight of the fabric is recommended.

8. What is the appearance of CBS-L?
CBS-L usually appears as a light yellow powder or granule that turns colorless when dissolved in water.

9. How stable is CBS-L in different pH environments?
It has excellent stability in pH 7–11, making it perfect for use in alkaline detergent formulations.

10. What are the advantages of using Optical Brightener CBS-L?

• Excellent whitening effect

• High solubility and dispersibility

• Good resistance to chlorine and hard water

• Strong affinity for fabrics

11. How should CBS-L be stored?
Store in a cool, dry, and well-ventilated place, away from direct sunlight. Keep the package tightly closed to prevent moisture absorption.

12. Is CBS-L environmentally safe?
Modern CBS-L formulations are designed to be eco-friendly and biodegradable, with minimal impact on the environment when used as directed.