| AVCO-BUFFER V is an alkali donor used for dyeing reactive dyestuffs in jets, winches and jiggers.AVCO-BUFFER V is an alkali buffer which controls a constant alkaline pH in the dyeing liquor through the whole dyeing program.AVCO-BUFFER V is replacing usage of Sodium Carbonate (soda ash). Being an alkali buffer, it enables a stable pH level along the dyeing process and consequently produces a very uniform fixation of the reactive dyestuffs onto cellulosic fibres.
SPECIFICATION:
| Appearance |
Colourless, clear liquid. |
| Chemical nature |
Inorganic alkaline buffer in aqueous solution. |
| Compatibility |
When using slightly hard water it is recommended to add a sequestering agent such as AVCO-POLYQUEST-RE. In general it is recommended to use soft water while dyeing. AVCO BUFFER V is not compatible with products sensitive to high alkalinity. |
| Density (at 25°C) |
App. 1.50 gr/cc |
| Foam |
Solutions of AVCO BUFFER V do not foam. |
| pH of 5% solution |
11.5-12.2 |
| Solubility |
Soluble in water at any proportion |
| Storage stability |
When properly stored in closed container shelf life is at least 12 months. |
PROPERTIES & USES:
- Ensures a stable alkaline pH during the dyeing process of cellusic fibres with
reactive dyes.
- Improvement of dyeing reproducibility.
- More level dyeing.
- Shortening of dyeing process.
- As AVCO-BUFFER V is a liquid product, it is very easy to handle it and to dose it
to the dyeing machines.
- Use of liquid AVCO-BUFFER V eliminates handling and dissolving of large amounts
of powdery soda ash.
- Soluble easily in cold water.
- Is not causing foam problems during application.
APPLICATION:
AVCO-BUFFER V is added to the dyeing liquor instead of Soda-Ash.
Following typical processes and quantity recommendation when using AVCO-BUFFER.
-
1.DYEING 100% COTTON WITH BI-FUNCTIONAL DYES (VS-MCT) REMAZOL / SUMIFIX
-
Add dyestuffs at 40°C.
-
Add salt in portions.
-
Heat to 60°C by 1°C/min.
-
Run at 60°C for 10 min.
-
Split AVCO-BUFFER V into 2 portions. (10% and 90% of the total).
Add first portion(10% of the total)- Dose lineary over 20 min.
Add second portion (the remainder) – Dose “curve – 05” over 30 min.
-
Run additional 30-45 min. for fixation.
ALTERNATIVE PROCESS:
-
Add dyestuffs at 40°C.
-
Add salt in portions.
-
Run at 40°C for 10 min.
-
Add first portion: 10% of the total of AVCO-BUFFER V – dose lineary over 20 min.
-
Heat to 60°C by 1°C/min.
-
Run at 60°C for 10 min.
-
Add second portion (the remainder of AVCO-BUFFER V) – Dose “curve – 05” over 30 min.
-
Run additional 30-45 min. for fixation.
-
2.DYEING COTTON/LYCRA WITH BI-FUNCTIONAL DYES (VS-MCT)
-
Start at 60°C. Add dyes (Dose lineary over 30 min).
-
Add salt (split into 3 portions – 10%, 20%, 70%).
-
Split AVCO-BUFFER V into 2 portions.
Add first portion: 5% of the total – Dose lineary over 30 min.
Add second portion: The remainder – Dose “curve- 07” over 45 min.
-
Run additional 30-45 min. for fixation.
As a guide use the following dosage of AVCO-BUFFER V for dyeing bi-functional dyes. (L:R=1:10).
| B.F. – DYESTUFFS % |
SALT (g/l)
|
AVCO-BUFFER V (cc/l)
|
|
< 0.1
|
10
|
4
|
|
0.1 – 0.5
|
20
|
6
|
|
0.5 – 1.0
|
30
|
6
|
|
1.0 – 3.0
|
50
|
8
|
|
3.0 – 6.0
|
60 – 70
|
8
|
|
>6.0
|
80
|
10
|
DYEING – 100% COTTON WITH PROCION HEXL
-
Add salt and dyestuffs at 40°C.
-
Heat to 90°C.
-
Circulate for migration at 90°C for 30 min.
-
Cool to 80°C.
-
Run at 800C for 15 min.
-
Dose AVCO-BUFFER V at 80°C lineary over 60 min.
-
Run for fixation for additional 30 – 60 min.
As a guide use the following dosage for PROCION HEXL dyeing at 80°C. L:R=1:10.
| PRO- DYESTUFFS (%) |
SALT (g/l)
|
AVCO-BUFFER V (cc/l)
|
|
– 0.5
|
15
|
4
|
|
0.5 – 1.0
|
30
|
5
|
|
1.0 – 2.0
|
40
|
5
|
|
2.0 – 3.0
|
50
|
6
|
|
3.0 – 6.0
|
60 – 70
|
8
|
|
> 6.0
|
80 – 100
|
8-10
|
SAFETY INSTRUCTIONS:
AVCO-BUFFER V is a corrosive alkaline material, and should be handled with care.
Goggles and gloves should be worn during handling the product. When handling large quantities or cleaning spills, also use apron and rubber boots.
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