HIGH AFFINITY OPTICAL BRIGHTENER FOR CELLULOSIC AND POLYAMIDE FIBERS

AVCO-LUX HA is a high affinity optical brightener for cellulose and polyamide articles.
Excellent white effects are achieved in the exhaust method at a wide temperature range of 20-130°C.

SPECIFICATIONS:

Appearance	Clear brownish liquid with fluorescence hue.
Chemical nature	Sulphonated stilbene derivative in aqueous solution.
Density (g/cc)	1.15 – 1.20
Ionicity	Anionic
Solubility	Soluble in water at any ratio.
pH (10% sol.)	7.5 – 9.5
Shade on fibres	Neutral to slightly bluish white
Compatibility	Is not compatible with acids and cationics
Storage	Sensitive to frost. Shelf life is at least 12 months.

PROPERTIES & USES1. High affinity optical brightener with neutral to slightly bluish shade.

2. Can exhaust at a wide temperature range of 20-130°C.

3. Recommended for brightening cotton, viscose, wool and polyamide fibres.

4. Stability on the fibres:

Hypochlorite bleach: very good

Chlorite bleach: unstable

Peroxide bleach: very good

Hydrosulfite bleach: very good

Steaming, fixation: very good

Acid stability: good up to pH of 3.0

5. Stability in bleaching baths:

Acid stability: unstable bellow pH of 4.0

Hypochlorite: not stable

Sodium chlorite: not stable

Peroxide: very good

Hydrosulfite: very good

APPLICATION:

1. For cellulose fibres AVCO-LUX HA is used in neutral to alkaline baths with medium to long liquor ratios. An addition of electrolyte is not required.

The optimum temperature is 60-70°C. The effect of the temperature is, however, not very pronounced and excellent white effects are achieved even when the products are applied at the temperature commonly used in peroxide bleaching baths. In order to achieve good levelness, it is advisable to add the pre-dissolved brightener right at the beginning of the process or at a low temperature.

2. AVCO-LUX HA can be applied in post reductive bleaching of cotton, after peroxide bleach.

3. In the case of polyamide fibers AVCO-LUX HA is used together with a reductive agent (e.g. BLANKIT IN). Reductive bleaching produces an increase in the whiteness, and at the same time the pH correction by the addition of acid is not necessary. High whiteness is achieved at 85-95°C.

4. AVCO-LUX HA is recommended for optical brightening of wool at 60°C.

GUIDING FORMULATIONS:

1. Cellulose yarns and fabrics:

AVCO-LUX HA 0.2 – 1.0%

Run for 30 minutes at 50 – 60°C.

Rinse warm

2. One step peroxide bleaching and optical brightening of cotton.

AVCO-BLANKINOL VLF 3.0 – 4.0 g/l

AVCO-LUX HA 0.2 – 1.0 %

H₂O₂ (50%) 6.0 -10.0 cc/l

Run for 45-60 minutes at 90-95°C.

Rinse warm and cold.

3. One step reductive bleaching and optical brightening of cotton

After peroxide bleaching, rinse well and apply the following recipe:

Sodium Hydrosulfite 2.0 – 3.0 g/l

AVCO-LUX HA 0.2 – 1.0%

Treat at 60-85ºC for 20-30 minutes.

Rinse warm and cold.

4. Polyamide yarns and fabrics – reductive bleaching:

AVCO-LUX HA 0.5 – 1.5 %

AVCO-CLEAN HT 2.0 – 3.0 g/l

Run for 30 minutes at 60 – 80°C

Rinse warm and cold.

5. Polyamide fibers

AVCO-LUX HA 0.5 – 1.5 %

AVCO-BLANK JET-HC 0.5 – 1.0 g/l

Acetic acid 0.5 – 1.0 cc/l

Adjust to pH 4-5

Run for 30 minutes at 98°C.

Rinse warm and cold.

6. Wool and silk

After peroxide bleaching apply reductive bleaching with the optical brightener.

AVCO-LUX HA 0.5 – 1.5%

AVCO-CLEAN HT 3.0 g/l

Apply for 30 minutes at 60°C.

Rinse warm.