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
PHYSICAL & CHEMICAL PROPERTIES
1. Almost Colourless transparent water white liquid, almost
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
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.
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
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:
||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,
||5 g/l active chlorine + 1 g/l
||At Room Temp for ½ - 1 hour, 2
cold washes, no antichlor is required.
||Preparatory for process no 3, 4
Bleach-Peroxide (steeping) -Over night process.
|Hydrogen Peroxide 50%
|4 % w/w
0 – 0.4 %
|3 – 4%
|2 – 3%
|4 – 6%
||80° C / 1 – 2 Hrs
||80° C / 1 – 2 Hrs
||80° C / 1 – 2 Hrs
||Room Temp 20 hrs
||Not recommended if
rust stains are present. Persulphate for improved desizing
||Cheaper method if
chlorine is not prohibited
30, 50 & 200 Kgs in Plastic Container.
9 to 12 months if stored below 30°c.
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.