Type of research: applied Duration from: 01/01/91. to 12/31/94. Papers on project (total): 68
Institution name: Tekstilno tehnološki fakultet, Zagreb (117) Department/Institute: Department for Textile Chemistry and Material Testing Address: Savska 16/5 City: 10000 - Zagreb, Croatia
Communication
Phone: 385 (0)1 275-767
Phone: 385 (0)1 271-582/9
Fax: 385 (0)1 440-276
E-mail: luka.cavara@x400.srce.hr
E-mail: cavara@olimp.irb.hr
Phone: 385 (0)1 444 258
E-mail: Ivo.Soljacic@public.srce.hr
Summary: Kinetics of hidrogen peroxide decomposition, as well as
PES fibres alkali hydrolysis, have been investigated, with the aim to
assess and improve wool peroxide bleaching process and obtain high
quality artificial silk. Heavy metal traces exhibit a catalitic influence
on peroxide decomposition and can result in wool demage, while, on the
other hand, accelerants in alkali delamination can enhance the effects of
processing on PES. Methods of detecting heavy metal traces on wool and
cotton have been developed. Spectrophotometric, polarographic,
chromatographic and gravimetric measurements have been employed to access
and improve textile finishing processes. The investigations indicate that
free formaldehyde content in textiles can be reduced by an adequate
choice of chemicals and processes. Some processes aimed at enhancing
quality have been developed and proposed, specially, in the area of
obtaining high oil repellancy, better fabric handle and light shade
colourations to washing, as well as in the area of obtaining optimal
effects of fabric frontal fixing. Some special methods of finishing and
care for textiles and artificial leather have been described and useful
instructions for processes improvement given. Changes of sorption and
electrokinetic properties cotton fibres and yarn in process mercerization
under different conditions of treatment in NaOH solutions is studied.
Keywords: wool, peroxide bleaching, alkali delamination, peroxide decomposition, kinetics and PES alkali hydrolysis, accelerators, heavy metal ions, free formaldehyde, spectrophotometry, polarography, chromatography, crease resist finish, catalysts, oil repellent finish, woven fabric handle, light colourations, shade change, optical brighteners, frontal fixation, care for textiles, colorimetry , colour matching, mercerization, electrokinetic potential, adsorption of surfactant, two-phase titration, streaming current
Research goals: The aim is to optimise some finishing processes
by investigation of certain parameters impact on the effects achieved.
Special attention will be paid to wool bleaching, PES alkali hydrolisis,
some finishing effects, frontal fixing effects, as well as to the
influence of optical brightener on the shade of pastel coloured fabrics.
The results obtained indicate that the traces of heavy metal ions have
deterime an influence on peroxide bleaching effects, so methods for their
detection and removal have been proposed.Models of PES alkali delamination
have been worked out as well. Fibre fineness variations have been
shown to have a significant impact on the handle, strength and oleophobic
finishing effects. The content of free formaldehyde on high grade finished
textile can be reduced, and even completely eliminated,if necessary, by
adequate choice of catalyst, net forming agents,and adequate processing
organisation. The change of pastel hue on light coloured samples,
which occurs in washing, can be minimised by adding optical brighteners
during dyeing. Colour change can occur in frontal fixing too, and the
proposed conclusion has been that manufacturer instructions are not
necessarily optimal conditions for process ingorganisation. New
knowledgements about change of sorption and electrokinetic properties of
cotton in mercerization, one of the most important finishing process are
studied.
COOPERATION - INSTITUTIONS
Name of institution
: Tekstilni kombinat Zagreb Type of institution: Economical/Production Type of cooperation: Systematic exchange of information City: 10000 - Zagreb, Croatia
Name of institution
: Karl Franzens Universitat, Institut fur
Physikalische Chemie Type of institution: University/Faculty Type of cooperation: Joint publishing of scientific papers City: Graz, Austrija Other information about the project.