Optical brightener VBL for printing and dyeing
Optical brightener VBL
C.I. NO. 85
Molecular formula: C36H34O8N12S2Na2
Indicator for textiles for paper
Light yellow to yellow uniform powder
2) Fluorescence intensity, (equivalent to standard), minute
3) Relative strength (for standard products), points
The optical brightener VBL belongs to the stilbene triazine type derivative, and its fluorescent color tone is cyan purple, which is anionic. It is mainly used for whitening, brightening, whitening, whitening of paper and whitening of detergents and coatings in bleached cotton fabrics.
I. Cotton fabric whitening and brightening
Application methods include dip dyeing, pad dyeing, sizing whitening, soap bath whitening and white printing. Its use amount: Dip-dyeing: 0.1~0.4%, padding 0.5~3g/L, conventional amount of auxiliary agent, bath ratio 1:20~40, temperature about 40°C, PH=7～9, time 30min, drying The dry temperature is preferably 70-80 ° C.
two. Whitening in the paper industry:
Brightener VBL is widely used in the paper industry, and its application methods include whitening in the slurry, coating, surface sizing and the like. The dosage is 0.1-0.5%, the bath ratio is 1:20-40, PH=8-9, the temperature is 20-45 ° C, and the time is 30 minutes.
Packaging and precautions:
1. Net weight 25kg cardboard drum/iron drum lined with plastic bag, or packed according to user needs.
2. The product should be stored in a cool place in a cool place to prevent direct sunlight and moisture absorption. The effective storage period is two years.
3. Brightener VBL can be mixed with anionic and nonionic surfactants, direct, acidic and other anionic dyes, coatings, etc., and should not be used in the same bath as cationic dyes and surfactants, synthetic resin condensate.
4. The water used is preferably soft water. It should not contain copper ions, iron and other metal ions and free chlorine.
5. The amount of the product should be appropriate. When it is excessive, the whiteness will decrease or even yellow, and the general dosage will not exceed 0.5%.
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