Optical brightener VBL (C.I.85 )

CAS No.:12224-06-5

MF: C₃₆H₃₄N₁₂Na₂O₈S₂

Molecular: weight: 872.84

Appearance: Light yellow to yellow powder

Color tone: blue-green and micro-purple

UV absorption (in E) : 348nm

Strength:  100±3%

Whiteness: WCIE: -3

Fineness: <10%

Moisture content: <5%

Inpurity content insoluble in water: 0.5%

 Applications:

       1.For cotton fabric and gluing products, light color or printing products.

2. For printing pulps and exhausting or padding dyeing.
3.For polyvinyl alcoholic fiber and polyamide fiber.
4. For paper-making industry, paper pulp or paints

Property:

1.with bluish violet color.
2.Soluble in soft water as much as 80 times weight, 300ppm in hard water.
3.Anionic types, alkali endurable, can be used in one bath of anionic and nonionic surfactant.
4.To be unendurable ion of copper and iron, etc. Unsuitable to be used in cationic dyestuff and surfactant.

Dosage:

1.The dosage used is 0.08-0.3% in printing and dyeing industry.

The conditions of VBL’S dip-dye whitening are similar to the direct dye.

For example: cotton cloth dip-dye Whitening

VBL 0.08-0.3% (fabric weight) anhydrous sodium sulfate:0-20% (plant weight)

Processing conditions, bath ratio 1: 20-1: 40, PH 7-9,Temperature: 20 - 40 °C,Time: 20-30 minutes.

Drying condition: drying temperature is usually the 70 - 80 °C

2. The dosage used is 0.1-0.3% in paper making industry.

Pad dying fabric whitening usually needs refining bleaching, dechlorination, drying, speed is generally  30-40 m / min or so, two Baptist 2 rolling, rolling liquid rate: 70-100%, temperature: 40 -50 °C, PH = 7-9 For example: cotton cloth whitening: VBL 0.5-3 g/l,Opened powder 0.25-0.5g/l.

Package: 25kg/drum,8tons/20FCL, or as per customer’s request.