Controller GG New - All-round high performance organic stabiliser for hydrogen peroxide bleaching
Technical Properties
A high degree of whiteness and protection against chemical fibre damage is achieved by this products effective regulation and control of peroxide decomposition. GOTS Approved product.
Application
It may be used in batch processing or in any type of continuous pad-steam system without the need of magnesium salt additions.
| Fabric in kiers, jigs, J box @ 3:1 liquor ratio | 2 - 6 g / kg or 0.6 - 2.0 % on weight of goods |
| Continuous pad steam peroxide bleaching | 4 -12 g / kg |
| Cold Pad Batch | 3 – 6 g/L |
| Jet machinery @ 6:1 liquor ratio | 0.5 - 1 g / l or 0.3 to 0.6 % on weight of Goods |
IRON SEQUESTRATION TEST ( 200 ppm )
Sequestration (or Chelation) is defined as the ability of a compound to form a metal ion complex which remains in solution despite the presence of a precipitating agent.
The metal ions which are particularly troublesome in fabric preparation are those of iron, copper, manganese, calcium and magnesium. The test involves making up the following solution :
X cc/l Product (sequesterant, dispersant, etc)
1.60 g/l FeCl3 (60%)
12.0 g/l NaOH (10%)
Solution pH should be 11.5 or higher. The solution is boiled for 3 minutes and then filtered whilst hot.
The resultant filter paper and filtrate are observed for precipitates of iron and compared visually with other products under evaluation.
The above test is particular to alkaline conditions which is generally the case when scouring and bleaching.
The presence of sodium hydroxide not only makes the solution alkaline but also precipitates Fe(3+), i.e. rust, from the FeCl3 . It is then up to the auxiliary to form a metal ion complex which remains in solution in order to prevent decomposition of the peroxide in the bleach bath and on the fabric to suppress damage such as ‘pin holes’
2 g/l Well Known Competitor Stabiliser 2 g/l Controller GG New
The sequestering properties in Controller GG New act as a safeguard against the presence of heavy metal contamination in the bleach bath and in the fabric.
PEROXIDE STABILISER COMPARISON
The performance of Controller GG New and the competitor product was compared under the following conditions:
6 g/l Stabiliser
10 g/l Caustic (100%)
40 g/l Peroxide (35%)
One litre of each liquor made up with demineralized water, the solutions were then placed on a hotplate and raised to the boil. Samples of liquor were taken at the following intervals and remaining peroxide levels determined by titration.
- Ambient temperature (initial peroxide level)
- 100°C, 0 minutes (raised to the boil from ambient temperature)
- 100°C, 10 minutes
- 100°C, 20 minutes
- 100°C, 30 minutes
NB. Prior to each sample being taken the liquor was topped up to the original level with demineralized water. To test for peroxide content, the following is carried out:
2 ml sample
Add 5 ml 1N Hydrochloric Acid
Titrate with 0.1 N Potassium Permanganate
Titre result x 2.43 = g/l Peroxide (35%)
No Controller |
Controller GG New |
Competitor Product |
|
Ambient |
40 g/l |
40 g/l |
40 g/l |
100°C, 0 min |
7 g/l |
37 g/l |
37 g/l |
100°C, 10 min |
3 g/l |
34 g/l |
29 g/l |
100°C, 20 min |
- |
28 g/l |
23 g/l |
100°C, 30 min |
- |
24 g/l |
17 g/l |
Peroxide loss |
40 g/l |
16 g/l |
23 g/l |
Controller GG New displays excellent peroxide regulating properties.
Scour / Bleach performance comparison.
The following exercise compares the stabilising and peroxide regulating properties of Controller GG New and the competitor product on 100% cotton, desized 48x44 using a combination scour / bleach recipe.
Recipe
Stabiliser 8 g/l
Scourtex FDL 4 g/l
Caustic (47%) 26 g/l
Peroxide (35%) 50 g/l
Peroxide level in bleach liquor (by titration) = 49.82 g/l (35%)
2 ml bath liquor = 20.50 ml Potassium Permanganate = 0.1 g Peroxide (35%)
Procedure
Desized fabric padded through bleach liquor, steamed for 25 minutes at 105°C and residual peroxide content left on fabric determined by titration.
Controller GG New
Dry fabric 22.26 g
Wet fabric 39.45 g
Add on 17.19 g bleach liquor
Equivalent to 0.856 g peroxide (35%) per 22.26 g fabric
= 38.45 g peroxide (35%) per kg fabric @ 77 % pick up.
Residual peroxide (35%) on fabric after bleach determined by titration = 0.039 g
= 1.75 g peroxide (35%) per kg fabric
= 4.55 % residual peroxide after bleaching.
Fabric whiteness (CIE) = 63°
Competitor Product
Dry fabric 22.00 g
Wet fabric 38.60 g
Add on 16.60 g bleach liquor
Equivalent to 0.827 g peroxide (35%) per 22 g fabric
= 37.60 g peroxide (35%) per kg fabric @ 75.5 % pick up.
Residual peroxide (35%) on fabric after bleach determined by titration = 0.032 g
= 1.45 g peroxide (35%) per kg fabric
= 3.86 % residual peroxide after bleaching.
Fabric whiteness (CIE) = 59.3°
As shown by the above exercise Controller GG New displays better peroxide regulating properties resulting in a safer bleach process and higher whiteness.
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