Technical Information Basotol
April 1999
Oxidizing agent for the textile industry
Auxiliary
- for protecting dyes against reduction
- for oxidizing vat dyes
Colorants and Finishing Products
Basotol
Nature Sodium m-nitrobenzene sulfonate, technically pure.
Physical Form Basotol is available as a mini flake or as granules.
Storage Two years. Protect the product from moisture.
Properties
Solubility Solutions of Basotol granules are best prepared by strewing the
product into water at 160-180°F (70-80°C). Stock solutions of
20% concentration are stable over long periods without re-
crystallization.
pH Approximately 9 (2 g/l aqueous solutions)
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Basotol
Application
Basotol serves to:
- protect dyes against reduction
- oxidize vat dyeings
1. Textile In direct printing with reactive dyes, e.g., Basilen P dyes, on
printing cellulosic fiber material, an addition of approximately 10 g/kg
Basotol to the print paste facilitates production of uniform prints
under varying steam conditions and protects the reactive dyes
from adverse reduction effects.
Basotol also prevents a change in shade of disperse dyes
under unfavorable conditions, e.g., in direct printing with Celliton
and Palanil dyes from natural thickening agents on acetate,
triactetate and polyester fibers. It is not necessary to add
Basotol when printing Palanil P dyes with a purely synthetic
thickening agent.
Basotol should not be used from printing polyamide fibers.
In the production of roller-printed discharge styles, readily
dischargeable grounds are often affected by “facing” of the
discharge paste. To counter this, the pre-dyed goods are either
padded with a solution of 5-8 g/l Basotol before printing or,
alternatively, preprinted or pre-padded with a slightly thickened
solution of 15-30 g/kg Basotol. It is also possible to nip pad the
printed goods. In both roller and screen printing this treatment
with Basotol ensures sharp outlines by preventing the formation
of halos around the discharge print.
Basotol is also suitable as a resist agent in the production of
resist prints under vat prints and dyeings.
Quantity used: 50-200 g/l Basotol.
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Basotol
2. Dyeing with In reactive dyeing Basotol prevents shade variations caused by
reactive dyes reduction of certain dyes under unsuitable processing
conditions (temperatures, time, hot air/steam).
Basotol is effective against traces of reducing agents, e.g., in
the dyeing of:
- viscose rayon material
- woven fabrics that still contain size
- knit goods that have not been boiled off
An addition of 1-2 g/l Basotol is made to the dye bath before the
reactive dye is added.
3. Boil off of The addition of 1-3 g/l Basotol to the boil off liquor prevents
colored reduction of susceptible dyes.
bleach goods
4. Oxidation Employed in strongly alkaline conditions without the risk of over
vat dyeings oxidation of the vat dye. This also applies to dyes of the
Palanthrene Blue RS type (Vat Blue 4).
The normal procedure of oxidizing vat dyeings in exhaust
procedures is to rinse well before oxidizing with hydrogen peroxide
as the oxidizing agent. This change in oxidation system provides
the following advantages:
- employed in strongly alkaline conditions
- avoidance of after-treatment stains and streaks
- lower water consumption
- safer processing
- savings in time
- dyeing with improved rub fastness, even navy blues and blacks.
There is no change in dye application procedure, i.e., application
and vatting remain unchanged from normal practice.
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Basotol
5. Oxidation in a The dye liquor is normally drained off from jigs and yarn dyeing
fresh bath equipment and a fresh bath set at 140°F for oxidation. Oxidation
is then carried out in fresh bath using these concentrations.
Jig or short liquor ratio Yarn or long
(depending on depth of shade) liquor ratio
4-8 g/l Basotol 2 g/l Basotol
Medium and dark shades of yarn should be given a reductive
clearing treatment before being oxidized with Basotol in a fresh
bath.
For jet dyeing machines or other long liquor ratio machines, cold
overflow rinse to eliminate most of the hydrosulfite is suggested.
The amount of hydrosulfite can be measured with vat indicator
paper. Then the addition of 2-4 g/l Basotol is made.
Basotol is compatible with the auxiliaries normally used in vat
dyeing (Basokol, Basogal, Trilon, Primasol, and Basol types).
Established dyeing recipes can often continue to be used because
oxidizing with Basotol in a fresh bath usually produces the same
shade as a peroxide oxidation with intermediate rinsing.
Preliminary trials are, however, recommended as shade variations
cannot be ruled out completely.
This procedure is very reliable and prevents oxidation stains.
4.2 Oxidation in Basotol is particularly advantageous as an oxidizing agent in the
continuous alkaline range on equipment that has only a few rinsing
equipment compartments (e.g., small continuous units). This treatment is
usually carried out with 5 g/l Basotol at 140°F (60°C). If the goods
are oxidized at 175-185°F (80-85°C), the final shade is achieved
more rapidly in the subsequent rinsing process.
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Basotol
Safety
When using this product, the information and advice given in our Safety Data
Sheet should be observed. Due attention should also be given to the precautions
necessary for handling chemicals.
We know of no ill effects that could have resulted from using Basotol for the
purpose for which it is intended and from processing it in accordance with current
practice.
According to the experience that we have gained over many years and other
information at our disposal, Basotol does not exert any harmful effects on health,
provided that it is used properly, due attention is given to the precautions
necessary for handling chemicals, and the information and advice given in our
Material Safety Data Sheet are observed.
Important: While the information and data contained in this bulletin are
presented in good faith and believed to be reliable, they do not constitute
a part of our terms and conditions of sales unless specifically incorporated
in our Order Acknowledgment. NOTHING HEREIN SHALL BE DEEMED
TO CONSTITUTE A WARRANTY, EXPRESS OR IMPLIED, THAT SAID
INFORMATION OR DATA ARE CORRECT OR THAT THE PRODUCTS
DESCRIBED ARE MERCHANTABLE OR FIT FOR A PARTICULAR
PURPOSE, OR THAT SAID INFORMATION, DATA OR PRODUCTS
CAN BE USED WITHOUT INFRINGING PATENTS OF THIRD PARTIES.
It is the responsibility of those to whom we supply our products to ensure
that any proprietary rights and existing laws and legislation are observed.
Note: Material Safety Data Sheet is available upon request.
BASF Corporation, 1999
Colorants and Textile / Leather Chemicals
BASF Canada Inc. BASF Corporation BASF Mexicana, S.A de C.V.
345 Carlingview Drive. 4330 Chesapeake Drive Insurgentes Sur 975
Toronto ON Charlotte, NC 28266 Col. Cd. de los Deportes
M9W 6N9 USA 03710 México, D. F.
Canada México
(416) 675-3611 (704) 392-4313 (5) 325 2709
800-545-4931
