Product name

Optical brightener VBL

Chemical property

CAS No:12224-16-7

Molecular formula:C36H34N12O8S2NA2

Molecular weight:872.84

Specifications:

Appearance: light yellow powder

Fluorescent color: blue-green and micro-purple

Strength: equal to 100 of the standard

Whiteness: WCIE: -3

Fineness: 5%

Moisture content: 5%

Impurity content insoluble in water: 0.5%

Applications:

Mainly used to whiten and brighten white cellulose fabric, paper, light-colored cellulose fabrics,

dial dye printing etc.

Recommended use:

1.Dip-dye Whitening

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

For example: cotton cloth dip-dye Whitening

VBL 0.1-0.3% (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.Pad dying Whitening

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 0.25-0.5 g / l,