Quality Inspection for Whitening Agent - Optical Brightener VBL – Subang

Structural formula

CAS NO: 12224-16-7

Molecular formula: C36H34N12O8S2Na2 Molecular weight: 872.84

Quality Index

1. Appearance: light yellow powder

2. Shade: Blue Violet

3. Fluorescence intensity (equivalent to standard product): 100,140,145,150

3. Moisture: ≤5%

5. Water insoluble matter: ≤0.5%

6. Fineness (sieve retention rate through 120 mesh standard sieve): ≤5%

Performance and Characteristics

1. It is anionic and can be used in the same bath with anionic surfactants or dyes, non-ionic surfactants and hydrogen peroxide.

2. It is not suitable to be used in the same bath with cationic surfactants or dyes.

3. The fluorescent whitening agent VBL is stable to the insurance powder.

4. Fluorescent brightener VBL is not resistant to metal ions such as copper and iron.

Scope of Application

1. Used for whitening cotton and viscose white products, as well as brightening light-colored or printed products, with general light fastness, good affinity for cellulose fibers, general leveling properties, printing, dyeing, pad dyeing and Suitable for printing paste.

2. Fluorescent brightener VBL can be used for whitening vinylon and nylon products.

3. Used for whitening of paper industry, pulp or paint.

Instructions

1. In the paper industry, the fluorescent whitening agent VBL can be dissolved in water and added to the pulp or paint.

In the paper industry, use 80 times of water to dissolve the fluorescent whitening agent VBL and add it to the pulp or coating. The amount is 0.1-0.3% of the weight of the bone-dry pulp or the bone-dry coating.

2. In the printing and dyeing industry, the fluorescent whitening agent VBL can be directly added to the dyeing vat, and it can be used after being dissolved in water.

Dosage

0.08-0.3%, bath ratio: 1:40, best dyeing bath temperature: 60℃

Storage and Precautions

1. It is recommended to store the fluorescent whitening agent VBL in a cool, dry place and avoid light. The storage period is 2 years.

2. The storage period of fluorescent whitening agent VBL is more than 2 months. A small amount of crystals are allowed, and the use effect will not be affected during the shelf life.

3. The brightener VBL can be mixed with anionic and non-ionic surfactants, direct, acidic and other anionic dyes, paints, etc. It is not suitable to be used in the same bath with cationic dyes, surfactants, and synthetic resins.

4. The best water quality should be soft water, which should not contain metal ions such as copper and iron and free chlorine, and it should be prepared as soon as it is used.

5. The dosage of the fluorescent whitening agent VBL should be appropriate, the whiteness will decrease or even turn yellow when it is excessive. It is recommended that the dosage should not exceed 0.5%.