used in alkaline liquors enhances a rapid and thorough hydrolysis resp.
solvolysis of PES
Oligomers deposited in the dyeing machines and on the fibre.
By adding suitable reduction agents additional
dyestuff residues are removed. This is supported by the excellent
dispersing effect of OLIGOMERAN N.
OLIGOMERAN N accelerates the discontinuous alkaline weight reduction of
Compared with the usual working methods without a catalyst, the amount of alkali,
the treatment time and temperature can be reduced by using OLIGOMERAN N boiling
off and in weight reduction. Used in reduction aftercleaning OLIGOMERAN N takes
the surface oligomer saponification actually possible.
of oligomers from dyeing machines
dyeing machine to be cleaned is filled with water and the following is added:
2 – 3 g/l
2 – 4 ml/l Caustic soda solution
1 – 2 g/l REDUTEX RCN RCN
1 – 2 g/l
Hydrosulphite conc. ( BASF)
then heated up
C and treated for 20 – 40 min. If possible , drain immediately and rinse.
Otherwise, cool to approx. 90°C
, drain and rinse. On dyeing machines such as jets and overflows the
aditional use of a additional use of a CO back cloth has proved of advantage to increase the
cleaning effect further.
oligomers from the goods
conventional alkaline reduction aftercleaning at 80 °C
OLIGOMERAN N help to saponify surface oligomers on the goods. On goods which
are not too critical the sole use of OLIGOMERAN N generally sufficient to solve
the oligomer problem by an alkaline reduction aftercleaning.
In case of problematic goods as regards oligomers it may,
however, be necessary to carry out a subsequent
finish (after rinsing and acidifying ) with oligomer binders, e.g. OLIGOMEX FP
52, OLG or 1166.under acid conditions.This produces a significant synergistic
increase in effect. By this combined process excellent results regarding removal
resp. minimizing of oligomers can be achieved without any further measures, even
in very critical cases. Especially, if OLIGOMEX OLG is used as oligomer
find all the additional information on product properties pertaining to
environmental protection as well as working safety on our separate standard
safety data sheet.
These data are derived from practical
experience and can - due to different plant conditions - only serve as
recommendations without any liability. Any exciting Industrial patent rights
have to respected.