SeraFastC RD
SeraFastC RD
SeraFastC RD
Product Information Auxiliaries
™
Sera Fast C-RD
Multi-purpose aftersoaping formulation for reactive dyestuffs
Function Soaping agent for removal of unfixed reactive dyestuffs from cellulosics
or blends with synthetic fibres after dyeing or printing
Properties - removes unfixed dyestuff from the fibre and keeps it in solution
- prevents re-exhaustion of hydrolysed and unfixed dyestuff onto the fibre
- independent of pH, salt concentration and water hardness
- reduces the total water consumption
- for continuous and discontinuous processes
- low foaming
- APEO and posphate-free
- biodegradable
Chemical Characteristics Formulation of a polymeric carboxylic acid derivative
Sera Fast C-RD - 2005/05 Page 1 of 2
Application
To remove unfixed reactive dye from the dyed fibre it is first necessary to dilute
the electrolyte to below a concentration of 2 g/l before the soaping stage.
Where possible rinsing should be hot (50 - 70 °C) to maintain the open structure
of the cellulose fibre and allow effective diffusion-out of the dye hydrolysate.
This is recommended for all Levafix® and Procion® dyes where the anchor system
is resistant to hot alkaline rinsing.
With Remazol® vinyl sulphone dyes the first rinse in the presence of residual
alkali should be at 30 - 50 °C for 10 minutes to avoid hydrolysing the vinyl-
sulphone cellulose covalent bond. After this initial rinse a neutralisation stage
using acetic acid at pH of 5 - 6 for 10 minutes at 50 - 80 °C should be given, after
which hot rinsing and soaping can be carried out.
The number of rinses before the soaping depends on the depth of shade, liquor
carry-over, and liquor ratio (refer to DyStar reactive dye pattern card)
Sera Fast C-RD is based on a surfactant with dye affinity which complexes with
the reactive dye hydrolysate to avoid redeposition on the fibre, thereby
improving the soaping efficiency.
Subsequent rinsing and after treatment should be as indicated in the DyStar
reactive dye pattern card.
DyStar Auxiliaries GmbH This information and our technical advice - whether verbal, in
Industriepark Höchst, Building B 598 writing or by way of trials - are given in good faith but without
warranty, and this also applies where proprietary rights of third
65926 Frankfurt am Main, Germany parties are involved. Our advice does not release you from the
Phone: ++49 (0) 69 - 21 09 - 26 86 obligation to check its validity and to test our products as to their
Fax Marketing: ++49 (0) 69 - 21 09 - 76 86 suitability for the intended processes and uses. The application, use
and processing of our products and the products manufactured by
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you on the basis of our technical advice are beyond our control and,
DyStar.Auxiliaries@DyStar.com therefore, entirely your own responsibility. Our products are sold in
www.Rotta-group.com accordance with our General Conditions of Sale and Delivery.
Sera Fast C-RD - 2005/05 Page 2 of 2
Technical Information
™
Sera Fast C-RD
P P
Advantages - removes unfixed dyestuff from the fibre and keeps it in solution
- prevents re-exhaustion of hydrolysed and unfixed dyestuff onto the fibre
- independent of pH, salt concentration and water hardness
- reduces the total water consumption
- for continuous and discontinuous processes
- low foaming
- APEO and posphate-free
- biodegradable
Application —
Limits —
Concentration 16%
Competition
Sera Fast C-RD - 2005/11 Page 1 of 6
Wash off improvement
A surplus of dyestuff especially on the surface of the fibres leads to poor values in wet fastness as well as dry
and wet crocking.
Fastness improvement can be achieved by thorough but time consuming rinse steps, which get economically
more and more difficult and unwanted.
Wet fastnesses on CO fibres can be improved by cationic after treatment, such as Sera Fast C-TE. The main
part of surplus dye should be removed in the wash off.
To improve the fastness during the wash off process products are used, which allow easy removal of unfixed
dye and their solution in the treatment liquor, which will be washed away or drained subsequently.
Dyeings based on different dye systems (reactive dyestuff hydrolysed compared to vat dye pigment) require
different wash off products
Test procedure: reactive dyes
Pad of hydrolysed reactive dyestuff: Procion Red H-E3B
(2.5 g/kg hydrolysed dye on fabric)
Original: fabric after padding with hydrolysed dye
2x soaped Fabric washed two times under mentioned conditions
1. adjacent padded fabric washed once; illustration: adjacent material of 1. boil
2. adjacent padded fabric washed twice; illustration: adjacent material of 2. boil
Reactive dyes: results in overview
- Cyclanon XC-W is sensitive to existence of water hardeners during the wash off
- Sera Fast C-RD brings better wash off results compared to Cyclanon XC-W when washed with hard water
- Sera Sperse C-SN also shows good results in hard water
Sera Fast C-RD - 2005/11 Page 2 of 6
neutral pH
original 2x soaped 1. adjacent 2. adjacent
soft Water
without auxiliary
2 g/l Sera Fast C-RD
2 g/l Decol SN
2 g/l Sera Quest M-PP
2 g/l Sera Wash M-SF
Sera Fast C-RD - 2005/11 Page 3 of 6
2 g/l soda ash
original 2x soaped 1. adjacent 2. adjacent
soft Water
without auxiliary
2 g/l Sera Fast C-RD
2 g/l Decol SN
2 g/l Sera Quest M-PP
2 g/l Sera Wash M-SF
Sera Fast C-RD - 2005/11 Page 4 of 6
2 g/l soda ash
original 2x soaped 1. adjacent 2. adjacent
20 ° dH
without auxiliary
2 g/l Sera Fast C-RD
2 g/l Decol SN
2 g/l Sera Quest M-PP
2 g/l Sera Wash M-SF
Sera Fast C-RD - 2005/11 Page 5 of 6
Trial results: Jet
adjacent WO, untreated
adjacent WO, treated
adjacent CO, untreated
adjacent CO, treated
Dyeing, treated ISO 105 E01
Dyeing, untreated
Dyeing, washed ISO 105 C01
adjacent CO, treated
adjacent CO, untreated
adjacent WO, treated
adjacent WO, untreated
customers' treated treated
normal Sera Fast C-RD Sera Fast C-RD
production plus softener
Sera Fast C-RD - 2005/11 Page 6 of 6