Custom High Quality Fluorescent Whitening Agent 4BK-L Supplier Company

Fluorescent Whitening Agent 4BK-L

C.I.: 351 CAS NO: 12768-92-3

Optical brightener 4BK-L is a highly efficient optical brightener specially designed for the textile industry. This brightener excels at whitening cellulose-based fabrics, including cotton, linen and viscose, making it ideal for manufacturers looking to increase the brightness of their textiles. With its purple-blue hue and impressive performance characteristics, 4BK-L plays a vital role in producing reliable, visually stunning fabrics.

Main features and typical advantages:
1. Good water solubility: One of the outstanding features of optical brightener 4BK-L is its good water solubility. It is soluble in water and therefore can be used for a variety of purposes. This feature is especially suitable for automatic feeding systems, which can be seamlessly integrated into the production process and ensure consistent dosing and application.
2. Whitening: 4BK-L is known for providing good whiteness to fabrics. This whitening agent increases the whiteness of treated fabrics, giving them a bright and clean appearance. Its purple-blue hue helps enhance the overall aesthetic, making the fabric look fresher and more appealing to consumers.
3. Good washing fastness: In addition to its whitening function, 4BK-L also has good wash fastness. Fabrics treated with this additive retain their brightness and vividness even after repeated washing, ensuring long-lasting visual appeal. This durability is critical for manufacturers who aim to produce textiles that stand up to consumer use.
4. Process adaptability: Fluorescent whitening agent 4BK-L has good process adaptability and is suitable for various whitening technologies. It can be effectively used in venting and calendering whitening processes, providing flexibility in application methods. This versatility allows manufacturers to choose a method that fits their production workflow while still achieving the desired results.

Product features:
1. Physical form: 4BK-L is available in liquid form and is easy to handle and use during textile processing.
2. Appearance: The whitening agent is in the form of a deep purple-blue liquid, which can visually show its efficacy and role in fabric whitening.
3. Viscosity: 4BK-L has a viscosity of less than 100 mPa.s at 25°C, ensuring smooth mixing and use in a variety of production systems.
4. Ionic properties: The brightener is anionic, which enhances its compatibility with other textile auxiliaries and chemicals commonly used in textile processing.
5. Flash point: 4BK-L has a flash point above 93°C and can be safely handled and stored under standard industrial conditions.
6. Density: The density of 4BK-L is between 1.12 and 1.22 g/cm³ at 25°C, which contributes to its effective solubility and performance during applications.
7. UV absorption: With a UV absorption range of 120-130 nanometers, 4BK-L effectively absorbs UV rays and reflects bright white light, thereby increasing the brightness of treated textiles.

Product application:
1. Cotton fabric: 4BK-L is ideal for cotton textiles as it significantly increases the brightness of the product, making it more visually appealing and thereby meeting consumer expectations.
2. Hemp and viscose fabrics: The additive is also suitable for whitening hemp and viscose fibers, allowing manufacturers to expand their product range while maintaining high quality standards.
3. Exhaust and filling process: 4BK-L can be effectively used in exhaust and pad dyeing and whitening processes, giving manufacturers the flexibility to choose their preferred application method based on production needs.

Preparation and use:
1. Dilution: Since 4BK-L has good water solubility, it is easily diluted in water to the desired concentration.
2. Use: After dilution, the whitener can be applied through an automatic feeding system to achieve stable and efficient results.

Main ingredients	stilbene type
Appearance	Dark blue purple liquid
Ionicity	Negative
UV absorption	120-130
pH value	7.0-9.0
Moisture	≤5.0%

Performance and features
1. Good process adaptability, it can be used for impregnation oxygen bleaching process and padding and baking process.	2. Liquid product, easy to dissolve and miscible with water in any proportion, especially suitable for automatic feeding systems.	3. It has an efficient fluorescent whitening effect on fabrics and gives the fabrics a bright blue-violet light.	4. Good washing fastness.

Scope of application

Suitable for whitening processing of cotton, polyester/cotton blended fabrics.

How to use
Dip dyeing method:	Dosage: 0.1-0.8% (o.w.f) Liquor ratio: 1:10-30 Temperature×time: 80-100℃×30-40min, wash with water and dry.
Long-term oxygen bleaching and whitening one-bath method (alkali oxygen one-bath whitening method):	Dosage: 1-6g/L Hydrogen peroxide (30%): 6-10g/L Stabilizer: 1-2g/L NaOH: 1-2g/L Refining agent: 0.5-1g/L Temperature×Time: 90-100℃× 30-60min, wash and dry.
Pad dyeing method:	Dosage: 1-6g/L Process flow: one dip and one rolling (rolling residue rate 70%) → drying (100℃), if necessary, setting at 150°C for 20-30 seconds. Users are advised to adjust the specific process parameters based on trial samples.

Things to note	Packaging and storage
Do not bathe with cationic softeners or other cationic additives during pad dyeing.	50kg plastic bucket, sealed and stored away from light, Shelf life is 6 months at room temperature.