Optical Brightening Agent Bmu Liq Fluorescent Whitening Agent with Bluish Violet White Shade for Cellulosic Fibers

• Customization: Available
• CAS No.: Na
• Formula: Na
• Model NO.: BMU
• EINECS: Na
• Environmental Protection: Yes
• Color: Yellow-Brown
• Kind: Whitening Agent
• Appearance: Liquid
• Application: Whitening Agent for Paper, Cotton Fabric Cellulose
• H.S.Code: 32042000
• Transport Package: 25kgs 50kgs, 200kgs or 1100kgs Drum
• Specification: 35%
• Trademark: AFINE
• Origin: China
• HS Code: 3204200000

Product Description

Optical Brightening Agent BMU LIQ
Fluorescent whitening agent with bluish violet white shade for cellulosic fibers and polyester/cellulose blends at all stages of processing.
Versatile application by continuous and exhaust processes.

Characteristics	Benefits
-Liquid, pumpable formulation, miscible with water in all proportions.	Simple handling, suitable for automatic dispensing equipment.
-Medium affinity.	No tailing, thus highly suitable for continuous processes. Outstanding leveling properties in exhaust and wash-whitening processes.
-Excellent build-up.	Very high and brilliant white maximum in continuous and exhaust applications.
-Very good acid stability.	Highly suitable in crosslinking baths. Catalysts selection in cellulosic crosslinking baths not critical
-Very good acid fastness.	No risk on acidification of textiles pretreated in an alkaline medium.
-Good stability to alkali, peroxide and electrolyte.	Designed for semi-continuous and continuous bleaching with hydrogen peroxide. Trouble free mixing with concentrated hydrogen peroxide in dispensing units.
-Very good stability to reducing agents.	Suitable for incorporation in print pastes for white discharges. Appropriate for reductive discontinuous bleaching.

General properties                 

1,Chemical basis
Stilbene disulphonic acid derivative
2,Ionicity
Anionic
3,Form supplied
pale yellow liquid 
4,Specific gravity (25 °C):
1.1-1.2 g/cm³
5,Viscosity (25 °C)
100 mPa · s max
DIN EN ISO 2431 No. 3
6,Solubility in water
Miscible with water in any ratio
7,pH 1 % in water
8.0-9.0
8,Stability to hard water
(1 % solution)
At least 4 mmol/l (Ca²⁺+Mg²⁺),
9,Stability to acids
(1 % solution in water)
Stable at pH 3.5-13
10,Affinity
Medium affinity for cotton and bast, with high dependence on temperature and salt additions.

11,Cast
Neture to slightly blue,
12,Storage stability
24 months from delivery ex plant, China in closed containers.
13,Note on safety
Information on handling and ecological and toxicological behaviour is contained in the safety data sheet for - BMU LIQ

Specifications                
For further details, please refer to the product specification for - BMU LIQ

Technical notes on application              

Cellulosic fibers
 

Continuous process:	From water, in neutral to slightly acid finishing liquors(pH above 3.5). In the peroxide impregnation bleach, in the immersion bleach and in wash-whitening process.
Exhaust process:	From water with addition of electrolyte. In the peroxide and reduction bleach.

Dissolving/diluting

Miscible with cold or warm water in all proportions.

Stock solutions should be kept away from the light; also substrates treated with the whitening agent,
as long as it is not fixed.

Required amount
 
CEL

Padding liquor pick-up about 70%	2-8 g/l
Peroxide impregnation bleach liquor pick up 80-100%	2-12 g/l
Exhaustion	0.2-1%

Suggested recipes - cellulosic fibres  
Continuous process/ finishing

Wash-and-wear finish
 

2 - 8	g/l	BMU LIQ
30 - 60	g/l	crosslinking agent
20 - 40	g/l	Polyalkylene SOFTENER
9 - 18	g/l	CATALYST
0.5 - 1	ml/l	acetic acid 80 % or
0.2	g/l	sodium fluoroborate
	Padding	liquor pick-up 60 - 90 %
	then
Drying and curing on conventional curing ranges
Predrying			110 - 130 °C and separate
Curing			150 - 155 °C for 5 - 4 min
or
Drying and curing on the stenter
Zones 1 and 2			110 - 130 °C
Zone 3, etc.:			150 - 180 °C
Total treatment time			70 - 40 s

If nitrate catalysts are used, the goods must be thoroughly washed off, as even minimal
amounts of nitrate cause the fabric to brown on exposure to light.

Soft handle finish

2 - 8	g/l	BMU LIQ
15 - 30	g/l	Polyalkylene SOFTENER
	or
2 - 8	g/l	BMU LIQ
10 - 20	g/l	Silicon SOFTENER
Padding		liquor pick-up 60 - 90 %
Drying		110 - 130 °C

Continuous bleaching

BMU LIQ promotes very high whiteness in pad-steam and cold pad-batch
bleaching and can be applied in the immersion (underliquor) bleach. Furthermore, owing to its high acid stability, BMU LIQ can readily be mixed with concentrated hydrogen peroxide in dispersing units. The textile material can be acidified without risk after bleaching process.
 

Cold pad batch	Pad steam bleach
2-12	2-12	g/l	- BMU LIQ
40-60	15-30	ml/l	hydrogen peroxide 35%
6-12	3-12	ml/l	sodium silicate 38°Bé
8-15	3-6	g/l	sodium hydroxide 100%
Padding liquor			pick-up 90-110%
Treatment time/temperature range			16-24 h at room temperature or 3-40 min at 100°C

*Concentrations are given for dry-on-wet impregnation. In case of wet-on-wet application, a single dosing of the whitening agent is recommended.
*If the goods are rinsed at high temperatures after bleaching in combination with - BMU LIQ,
an electrolyte addition is recommended.

Soft handle finish
 

2-8	g/l	- BMU LIQ
Padding		liquor pick-up 60-90%
Drying		110-130°C

Exhaust process

The exhaustion of - BMU LIQ depends on the temperature and electrolyte content. - BMU LIQ can be applied in combination with the peroxide bleach.

0.2-1	%	- BMU LIQ
2-5	g/l	Glauber's salt, anhyd.
4-12	ml/l	hydrogen peroxide 35%
0.5-3	g/l	sodium hydroxide 100%
Liquor ratio		10 : 1-20 : 1
Temperature range/ time		- without bleach: 30-60 °C for 15-30 min - with bleach: 95 -80 °C for 30-60 min

*If the goods are rinsed at high temperatures after bleaching, an electrolyte addition is recommended.
*- BMU LIQ can also be applied in presence of reducing bleaching agents (stabilized sodium dithionite).

Brightening pastel shades

The brightness of pastel shades can be improved in dyeing with
0.1-0.3 %                      - BMU LIQ

White discharges

White discharges are usually produced with
2-8 g/kg - BMU LIQ

Preliminary trials should be carried out owing to the widely different formulations of the print pastes used

Leveling/stripping
20 - 60 min at 60 - 90 °C
*To freshen up the whiteness and avoid subsequent yellowing, hydrogen peroxide or stabilized sodium dithionite should be added.
*Re-whitening can be carried out with - BMU LIQ or other products in our products range which are suitable for cellulosic fibers.
*- BMU LIQ can be radically stripped using a sodium chlorite bleach.

Note
Heavy metal ions, e.g. copper, iron and manganese (from approx. 0.1 mg/l) impair the fluorescent whitening
effects. These ions must bebuffered with a chelating agent.

Note
Fastness properties were tested and evaluated in accordance with the guidelines for evaluating the colour fastness of textiles (DIN/EN/ISO). Fastness of fluorescent whiteners depend on the quantities applied, the
mode of application as well as the provenience of the fibre material. This may result in deviations of fastn- esses compared to the ones given by us.


Stability

	in the liquor	on the fibre
Hypochlorite bleaching liquors	not stable	good
Sodium chlorite bleaching liquors	not stable	not stable
Peroxide bleaching liquors	good	good
Reductive bleaching liquors (hydrosulphite-based)	stable	good
Acid	below pH 3. 5 not stable	below pH 3.5 not stable
Alkali	good	good
Hard water	good

 

Fastness properties

 

	CEL
Light		3-4
Washing *	40 °C	5
	60 °C	4-5
	95 °C	4
Chlorine bleach	mild	5
	severe	4
Chlorite bleach		1
Alkali		5
Acid		5
Perspiration	alkaline acid	5 5
Dry heat	30 s / 180 °C	5
Nitrogen oxides	1 cycles 2 cycles	5 4-5
Burnt gas fumes	1 cycles 2 cycles	4-5 4-5
Ozone	1 cycles 2 cycles	4-5 3-4

* The ratings also apply when the wash liquor contains oxidative (hydrogen peroxide) bleaching agent.BMU LIQ
Fluorescent whitening agent with bluish violet white shade for cellulosic fibers and polyester/cellulose blends at all stages of processing.
Versatile application by continuous and exhaust processes.