EP0513291B1 - Procede de reduction de colorants textiles - Google Patents

Procede de reduction de colorants textiles Download PDF

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Publication number
EP0513291B1
EP0513291B1 EP91920878A EP91920878A EP0513291B1 EP 0513291 B1 EP0513291 B1 EP 0513291B1 EP 91920878 A EP91920878 A EP 91920878A EP 91920878 A EP91920878 A EP 91920878A EP 0513291 B1 EP0513291 B1 EP 0513291B1
Authority
EP
European Patent Office
Prior art keywords
reduction
dye
iron
salt
reducing
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
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EP91920878A
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German (de)
English (en)
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EP0513291A1 (fr
Inventor
Thomas Institut für Textilchemie BECHTOLD
Eduard Institut für Textilchemie BURTSCHER
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Verein Zur Forderung der Forschung u Entwicklung der Textilwirts
Original Assignee
Verein Zur Forderung der Forschung u Entwicklung der Textilwirts
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Publication of EP0513291A1 publication Critical patent/EP0513291A1/fr
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Classifications

    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06P—DYEING OR PRINTING TEXTILES; DYEING LEATHER, FURS OR SOLID MACROMOLECULAR SUBSTANCES IN ANY FORM
    • D06P1/00—General processes of dyeing or printing textiles, or general processes of dyeing leather, furs, or solid macromolecular substances in any form, classified according to the dyes, pigments, or auxiliary substances employed
    • D06P1/22—General processes of dyeing or printing textiles, or general processes of dyeing leather, furs, or solid macromolecular substances in any form, classified according to the dyes, pigments, or auxiliary substances employed using vat dyestuffs including indigo
    • D06P1/221—Reducing systems; Reducing catalysts

Definitions

  • vat, sulfur and indigo dyes have a considerable market share, since these dyes are among the highest quality types of dyes for dyeing cellulose fibers.
  • All three classes of dyes have in common that when used, the dyes, which are usually present in the insoluble, oxidized form, are converted into the lye-soluble, reduced form by a reduction step.
  • the reduced dye molecules have a high affinity for the fiber material and therefore attach to the fibers.
  • the dyes are then completely fixed on the fiber by oxidation of the dye molecules, which in turn become insoluble.
  • Na2S2O4 sodium dithionite
  • a disadvantage here is the strong temperature dependence of the redox potential, which can result in excessive dye reduction with undesirable irreversible changes in color, particularly at high temperatures.
  • Another problem with the use of sodium dithionite is the lack of resistance of the chemical in alkaline treatment baths. Even in the absence of atmospheric oxygen, there is slow self-decomposition, which is particularly the case when using appropriate oxygen Printing pastes in textile printing shops make storage of them and thus also a universal use impossible.
  • sodium dithionite is one of the reducing agents with a relatively high reduction rate, which means in concrete terms that dye reduction at room temperature is complete after a few minutes in most cases. At higher temperatures, the dye is reduced more quickly; on the other hand, the rate of self-decay increases.
  • Formaldehyde sulfoxylates are more stable towards atmospheric oxygen, which can be explained by the lower reactivity of these compounds.
  • the reducing agents in this class can achieve sufficiently high reduction potentials (approx. -1100 mV).
  • the compounds mentioned require relatively high temperatures (from approx. 90 ° C.) in order to enable a sufficient speed in dye reduction.
  • the reducing agents are often used in textile printing pastes, since this ensures that the pastes have sufficient storage stability.
  • the rate of reduction of these classes of compounds can be classified as very low at room temperature.
  • the use of metal complex catalysts has therefore been extensively investigated to accelerate dye reduction. In this procedure, the reducing agent can be activated by adding a small amount of a metal complex (in particular nickel, cobalt complexes).
  • thiourea dioxide behaves fundamentally similar to the reducing agents already described.
  • the iron (II) sulfate sodium hydroxide reduction technique is only of historical importance, but is noteworthy in connection with the invention.
  • a disadvantage of this reduction technology is the fact that no homogeneous reduction conditions are possible, since both that which arises in the alkali Iron (II) hydroxide, as well as the iron (III) hydroxide formed by oxidation, are largely insoluble in the alkali. This formation of precipitation is not acceptable for the production of colored textiles taking modern production processes into account. The precipitation removes relatively large amounts of dye from the dye bath, which results in poor reproducibility of the dyeings, high dye costs and difficulties in wastewater treatment.
  • a prerequisite for carrying out a dye reduction according to the invention by means of a metal complex salt with a low valence level is the finding of complexing agents which, in addition to the required stability, also enable a sufficient reduction potential of the iron (II) complex.
  • suitable complexing agents sufficiently high concentrations of reducing metal ions in solution can be achieved according to the invention. Both the reduced and the oxidized form of the metal complex remain homogeneously dissolved in the treatment solution.
  • disruptive precipitations can be avoided.
  • the reduction speeds achievable when such a reducing agent is used are unexpectedly high.
  • complete dye reduction can now be achieved in a matter of seconds.
  • Another advantage is the possibility of controlling the reduction effect of the metal complexes (reduction potential) by selecting the complexing agent. This enables adaptation to the optimum process engineering requirements in each case. Conventional reducing agents do not allow such optimizations to a comparable extent.
  • Suitable metal complex systems for dye reduction are, for example, iron (II) salts with organic complexing agents such as triethanolamine or citric acid (achievable reduction potentials in an alkaline environment approx. -1000 mV).
  • organic complexing agents such as triethanolamine or citric acid
  • Other metal complexes can also be suitable if the metal complex compound used can form a reduction potential in alkaline solution which is above the respective reduction potential of the dye used.
  • the required amounts of metal complex are so high, depending on the process technology, that sufficient stability of the reduction state of the liquor is ensured during the treatment time. These concentrations are lowest in the pull-out dyeing.
  • concentrations of 0.01 mol / l are required, the required concentration of triethanolamine is then around 0.1 mol / l.
  • lower amounts are also possible.
  • higher concentrations of reducing agent are required, the amount to be used varies depending on the process step and plant design.
  • test examples described show possibilities for using the metal complex reducing agent for printing processes with vat dyes. These examples confirm the applicability in various process engineering variants.
  • the printed goods can now be finished by washing and boiling soap according to the usual process techniques.
  • the dye present in the printing thickener is fixed by lingering at room temperature, at the same time the azo dye that was applied to the goods in the previous dyeing process is reductively irreversibly discolored.
  • the reduction processes can be accelerated by increasing the temperature.
  • the printed goods can now be finished by washing and boiling soap according to the usual process technology.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Coloring (AREA)
  • Chemical Or Physical Treatment Of Fibers (AREA)

Claims (5)

  1. Procédé pour réduire des colorants pour textiles en milieu alcalin aqueux à l'aide d'un complexe d'un sel de fer, caractérisé en ce que l'on utilise un sel ferreux en quantité telle que son oxydation suffise, seule, à provoquer la réduction voulue du colorant.
  2. Procédé selon la revendication 1, caractérisé en ce que le sel ferreux est le sulfate ferreux.
  3. Procédé selon la revendication 1 ou 2, caractérisé en ce que l'agent complexant organique utilisé est la triéthanolamine.
  4. Procédé selon une des revendications 1 à 3, caractérisé en ce que l'agent complexant organique utilisé est l'acide citrique.
  5. Procédé selon une des revendications 1 à 4, caractérisé en ce que le complexe est ajouté à une pâte d'impression prévue pour l'impression de textiles.
EP91920878A 1990-12-03 1991-12-02 Procede de reduction de colorants textiles Expired - Lifetime EP0513291B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
AT2436/90 1990-12-03
AT243690 1990-12-03
PCT/AT1991/000123 WO1992009740A1 (fr) 1990-12-03 1991-12-02 Procede de reduction de colorants textiles

Publications (2)

Publication Number Publication Date
EP0513291A1 EP0513291A1 (fr) 1992-11-19
EP0513291B1 true EP0513291B1 (fr) 1996-03-20

Family

ID=3534319

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91920878A Expired - Lifetime EP0513291B1 (fr) 1990-12-03 1991-12-02 Procede de reduction de colorants textiles

Country Status (5)

Country Link
US (1) US5443599A (fr)
EP (1) EP0513291B1 (fr)
AT (1) ATE135765T1 (fr)
DE (1) DE59107584D1 (fr)
WO (1) WO1992009740A1 (fr)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19842929A1 (de) * 1998-09-18 2000-03-23 Schwihag Gmbh Vorrichtung zum Befestigen von Radlenkern
DE10010060A1 (de) 2000-03-02 2001-09-06 Dystar Textilfarben Gmbh & Co Mediatorsysteme auf Basis gemischter Metallkomplexe zur Reduktion von Farbstoffen
DE10010059A1 (de) 2000-03-02 2001-09-06 Dystar Textilfarben Gmbh & Co Mediatorsysteme auf Basis gemischter Metallkomplexe zur Reduktion von Farbstoffen
EP3120934A1 (fr) 2015-07-20 2017-01-25 Westrock Dispensing Systems Inc. Distributeur à pompe avec élément de verrouillage
CN110644262B (zh) * 2019-10-14 2021-11-09 常州大学 一种植物靛蓝印花方法
TWI802146B (zh) * 2021-12-13 2023-05-11 財團法人紡織產業綜合研究所 染色設備及清洗布料的方法

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1774940A (en) * 1928-10-20 1930-09-02 Mengel Edwin Potter Coloring walnut veneer sheets
GB427900A (en) * 1933-11-02 1935-05-02 Ici Ltd Improved textile printing process
US2906587A (en) * 1954-01-18 1959-09-29 Cfmc Triamino-benzene-n-sulfonate dyes and process of using same
US2923592A (en) * 1954-12-01 1960-02-02 Crosland Percy Field Processes of dyeing cellulosic materials with inorganic metallic compounds
US2843580A (en) * 1956-04-04 1958-07-15 Eastman Kodak Co Metallized azo dyes prepared by coupling amino-phenols to diphenylamines
US3086004A (en) * 1959-12-18 1963-04-16 Hoechst Ag Complex metal compounds of waterinsoluble azo-dyestuffs
US3096319A (en) * 1960-01-14 1963-07-02 Hoechst Ag Complex metal compounds of water-insoluble monoazo 3-indazole dyestuffs
AT398316B (de) * 1989-06-01 1994-11-25 Verein Zur Foerderung Der Fors Verfahren zur reduktion von farbstoffen

Also Published As

Publication number Publication date
EP0513291A1 (fr) 1992-11-19
DE59107584D1 (de) 1996-04-25
ATE135765T1 (de) 1996-04-15
US5443599A (en) 1995-08-22
WO1992009740A1 (fr) 1992-06-11

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