OPTICAL BRIGHTENER ER-II

OPTICAL BRIGHTENER ER-I

Fluorescent Whitening Agent for Polyester at Low Temperature

I Technical data:

Appearance: cream white or pale yellow dispersion liquid

Shade: blue

Particle size: 90%≤2μm

PH value: 6-7

Density: 1.035±0.02

Ionicity: nonionic

II Applications:

It is mainly applicable to whitening and brightening of polyester fiber and the blends, especially to whitening of polyester fiber knitting at low-temperature (95-100℃).

III Directions for use and dosage: (only for reference)

1. Exhaust dyeing method of low-temperature absorption:

Dosage: 0.3-0.7% (o.w.f)

Liquor ratio: 1:10-20

Dyeing temperature: 95-100℃

Dyeing time: 30-40min

PH value: 4.5-5.5 (adjusted with acetic acid)

Procedure: add additive, acetic acid (adjusting PH: 4.5-5.5) and BC-103 FWA into the dye bath according to the formula, raise temperature to 95-100℃ as the rate of 2-3℃/min, keep constant temperature for 30-40min → drop in temperature → washing → dehydration and drying (80-100℃), its whiteness can meet the user’s requirement. If the user has fixing machine, carry out pre-drying (80-100℃) and curing (170-175℃, 30-40s) after washing and dehydration, then whiteness will be better.

2. Pad dyeing method:

Dosage: 1.5-4g/L

Procedure: 2 dips 2 nips (pick up: 70%) → pre-drying (100℃) → curing and thermo-fixing (175-180℃, 30 seconds)

3. High-temperature and high-pressure exhaust dyeing method:

Dosage: 0.2-0.5%（o.w.f）

Liquor ratio: 1:10-20

Dyeing temperature: 120-130℃

Dyeing time: 30-60min

PH value: 4.5-5.5 (adjusted with acetic acid)

IV Using tips

1. If suspension liquid precipitates and separates after stored for a long period, please fully stir before use.

2. It shall be used within the yellowing spot range of this product, i.e. pad dyeing ≤5g/L, exhaust dyeing ≤0.8% (o.w.f). It will be subject to yellowing if beyond the dosage range.

V Packaging and Storing:

5kg in plastic drum, 20kg/paper carton (4 drums). Quality guarantee period is 8-12 months under normal temperature.