LyzerBleach PB

LyzerBleach PB is a Non Silicate based peroxy - stabilizer useful in processing of cotton, especially knitted goods & towels. LyzerBleach PB stabilizes Hydrogen Peroxide, even under strong alkaline condition such that it allows scouring & peroxide bleach in one bath. It does not impart harshness to the fabric & gives fullness along with full absorbency to the cloth, the quality that is required for towels & knitted goods.

PHYSICAL & CHEMICAL PROPERTIES
1. Almost Colourless transparent water white liquid, almost without odour.
2. Anionic in nature. Free from organic Surface Active Agents.
3. pH of 1% solution 10.2.
4. Non Volatile Matter at 110° C is 22%. Freely soluble in water.

APPLICATION
FIRST STEP: DEMINERALISATION:
The iron impurities like rust stains or iron particles from weaving accelerate peroxide bleaching such that there is a tendency to cause pin holing around iron impurity. For the cloth likely to have high iron impurities, demineralisation is required before peroxide boil. Demineralization method involves treatment with sulphuric acid 5 g/l + oxalic acid 2 g/l or Hydrochloric acid 15 – 20 gpl at 60° C for ½ - 1 Hr., followed by hot & cold wash. Alternetively treatment may be given at Room Temp for 4 to 6 hrs. The process may be omitted if the iron impurities are absent.

SECOND STEP: HYPOCHLORITE BLEACH
Treat the goods with 5g/l available chlorine + 1 g/l LyzerWet BL at Room Temperature, followed by cold wash with running water. LyzerWet BL is a wetting agent for hypochlorite, which by itself does not consume chlorine & remain stable under the bleaching bath condition. Treatment helps to reduce the chemical cost. If chlorine bleach is not permissible due to any regulations, hypochlorite bleaching process may be omitted.

THIRD STEP: One Step Scour / Peroxide Boil
Prepare the bath with LyzerBleach PB - 0.8% w/w + Caustic Soda 4% w/w + LyzerStain SR 1% w/w. Insert the goods & treat the goods at 80 - 85° C for 10 min. Then add Hydrogen Peroxide 2% - 6% w/w* (see note below) & continue for 1.5 to 2 hrs. Give two cold washes & neutralise with acetic acid.

FOURTH STEP
Treatment with optical whitener may be done in the same peroxide bath (Step 3 above),using optical whitener stable to peroxide. It may be added to peroxide bath after 1 - 1.5 hrs & treatment may be further continued for remaining 1/2 hrs to complete both peroxide bleach & optical whitening. Hot Wash, Cold Wash to complete the process.

Notes to Peroxide Bleach above Step No 3,

1. The amount of Hydrogen peroxide may be increased to 3 - 4 % w/w if the goods are not treated with hypochlorite bleach.

2. If the goods contain sizing used for warping, it is suggested to carry out desizing by any standard process as a first process.

3. In case it is intended to carry out one step process only, then it is suggested to use hydrogen peroxide 3.5 - 4 % w/w Hydrogen peroxide, in above recipe. It is known that and 0.2 - 0.5% w/w potassium persulphate For a overnight process at room temperature the peroxide required is 5 – 6% & the treatment is given for 18 to 20 hrs. It is known that Potassium Persulphate depolymerises starches faster than peroxide hence for one step peroxide treatment 0.2 to 0.4% Persulphate as an addition to peroxide bath, improves removal of sizes.

4. Mercerising if required may be carried out prior to peroxide bleach at any stage as per the set up of the process house.

Application at a glance:
Short Preparatory Methods:
 

Sour	15 to 20 g/l of 33% Hydrochloric acid + 1 g/l LyzerWet BL	Either at Room Temp for 4 hrs or at 60° C for 1 hr 2 cold washes,	Preparatory for process no 2, 3, 4
Hypo Bleach	5 g/l active chlorine + 1 g/l LyzerWet BL	At Room Temp for ½ - 1 hour, 2 cold washes, no antichlor is required.	Preparatory for process no 3, 4

 

Process No	1	2	3	4
	Gray-Peroxide	Gray-sour-peroxide	Gray-sour-Hypo Bleach-peroxide	Gray-sour-Hypo Bleach-Peroxide (steeping) -Over night process.
Caustic Soda	4% w/w	4%	4%	4%
LyzerSpin SR	1% w/w	1%	1%	1%
LyzerBleach PB	0.8%	0.8%	0.8%	0.8%
Hydrogen Peroxide 50% Potassium persulphate	4 % w/w 0 – 0.4 %	3 – 4% 0	2 – 3% 0	4 – 6% 0
Temp Time	80° C / 1 – 2 Hrs	80° C / 1 – 2 Hrs	80° C / 1 – 2 Hrs	Room Temp 20 hrs
Remarks	Not recommended if rust stains are present. Persulphate for improved desizing if required		Cheaper method if chlorine is not prohibited

Packing:
30, 50 & 200 Kgs in Plastic Container.

Shelf Life
9 to 12 months if stored below 30°c.

Note:
According to our best knowledge and technical experiments, the above data is true and accurate. Regarding to variety of consumption procedures, it is recommended to evaluate the information before use.