EP0513291A1 - Process for reducing textile dyestuffs. - Google Patents
Process for reducing textile dyestuffs.Info
- Publication number
- EP0513291A1 EP0513291A1 EP91920878A EP91920878A EP0513291A1 EP 0513291 A1 EP0513291 A1 EP 0513291A1 EP 91920878 A EP91920878 A EP 91920878A EP 91920878 A EP91920878 A EP 91920878A EP 0513291 A1 EP0513291 A1 EP 0513291A1
- 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.)
- Granted
Links
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 qualitatively one of the highest quality types of dyes for dyeing cellulose fibers. All three 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.
- the currently most frequently used chemical for reducing the dye molecules in the caustic dye bath is sodium dithionite (Na 2 S 2 0 4 ).
- Na 2 S 2 0 4 The currently most frequently used chemical for reducing the dye molecules in the caustic dye bath.
- This connection enables relatively high reduction potentials to be achieved in the dyebath (approx. -1000 mV).
- a disadvantage here is the strong temperature dependence of the redox potential, which can result in excessive dye reduction with undesirable irreversible color changes, especially 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 the textile printing works make storage of the same and thus also make 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, as this ensures that the pastes have an adequate 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 remarkable in connection with the invention.
- a disadvantage of this reduction technology is the fact that no homogeneous reduction conditions are possible.
- 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 precipitation 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 degree.
- 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 are lowest in the pull-out dyeing.
- concentrations of 0.01 mol / 1 are required, the required concentration of triethanolamine is then around 0.1 mol / 1.
- 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.
- Application example 1 direct printing
- the cotton fabric pretreated by conventional methods is printed with a paste of the following composition: 0.69 g FeS0 4 .7H 2 0 2.77 g H 2 0
- the printed goods can now be finished by washing out and boiling soap according to the usual process techniques.
- vat etching can be carried out with such goods.
- the goods are printed with a printing paste of the following composition:
- Dye is made by dwelling 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 soaping in accordance with the usual process technology.
- Application example 3 direct printing, with subsequent reduction
- the cotton fabric pretreated in the usual way is printed with a paste of the following composition:
- the dye is reduced by immersing them in a bath of the following composition and then squeezing:
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)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT2436/90 | 1990-12-03 | ||
AT243690 | 1990-12-03 | ||
PCT/AT1991/000123 WO1992009740A1 (en) | 1990-12-03 | 1991-12-02 | Process for reducing textile dyestuffs |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0513291A1 true EP0513291A1 (en) | 1992-11-19 |
EP0513291B1 EP0513291B1 (en) | 1996-03-20 |
Family
ID=3534319
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP91920878A Expired - Lifetime EP0513291B1 (en) | 1990-12-03 | 1991-12-02 | Process for reducing textile dyestuffs |
Country Status (5)
Country | Link |
---|---|
US (1) | US5443599A (en) |
EP (1) | EP0513291B1 (en) |
AT (1) | ATE135765T1 (en) |
DE (1) | DE59107584D1 (en) |
WO (1) | WO1992009740A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
AU767735B2 (en) * | 1998-09-18 | 2003-11-20 | Schwihag Gesellschaft Fur Eisenbahnoberbau Mbh | Guide-rail attachment for railroad switch |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10010060A1 (en) | 2000-03-02 | 2001-09-06 | Dystar Textilfarben Gmbh & Co | Mediator system for alkaline vat or sulfur dyeing of cellulose textiles comprises electrochemically-active polyvalent metal ions, hydroxy group-containing complexer and salt of an electrochemically-inactive polyvalent metal |
DE10010059A1 (en) | 2000-03-02 | 2001-09-06 | Dystar Textilfarben Gmbh & Co | Mediator system especially for alkaline vat or sulfur dyeing of cellulose textiles comprises polyvalent metal ions, an amino group-containing complexer and a hydroxy group-containing complexer |
EP3120934A1 (en) | 2015-07-20 | 2017-01-25 | Westrock Dispensing Systems Inc. | Pump dispenser with locking feature |
CN110644262B (en) * | 2019-10-14 | 2021-11-09 | 常州大学 | Plant indigo printing method |
TWI802146B (en) * | 2021-12-13 | 2023-05-11 | 財團法人紡織產業綜合研究所 | Dyeing apparatus and method for washing cloth |
Family Cites Families (8)
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 (en) * | 1989-06-01 | 1994-11-25 | Verein Zur Foerderung Der Fors | METHOD FOR REDUCING DYE |
-
1991
- 1991-12-02 DE DE59107584T patent/DE59107584D1/en not_active Expired - Fee Related
- 1991-12-02 AT AT91920878T patent/ATE135765T1/en not_active IP Right Cessation
- 1991-12-02 WO PCT/AT1991/000123 patent/WO1992009740A1/en active IP Right Grant
- 1991-12-02 EP EP91920878A patent/EP0513291B1/en not_active Expired - Lifetime
-
1994
- 1994-12-19 US US08/358,689 patent/US5443599A/en not_active Expired - Lifetime
Non-Patent Citations (1)
Title |
---|
See references of WO9209740A1 * |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
AU767735B2 (en) * | 1998-09-18 | 2003-11-20 | Schwihag Gesellschaft Fur Eisenbahnoberbau Mbh | Guide-rail attachment for railroad switch |
Also Published As
Publication number | Publication date |
---|---|
ATE135765T1 (en) | 1996-04-15 |
EP0513291B1 (en) | 1996-03-20 |
US5443599A (en) | 1995-08-22 |
DE59107584D1 (en) | 1996-04-25 |
WO1992009740A1 (en) | 1992-06-11 |
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