EP0741777A1 - Bleichen von jeans - Google Patents
Bleichen von jeansInfo
- Publication number
- EP0741777A1 EP0741777A1 EP95906992A EP95906992A EP0741777A1 EP 0741777 A1 EP0741777 A1 EP 0741777A1 EP 95906992 A EP95906992 A EP 95906992A EP 95906992 A EP95906992 A EP 95906992A EP 0741777 A1 EP0741777 A1 EP 0741777A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- mmol
- activator
- bath
- sulfate
- cotton fabrics
- 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
- D06P5/00—Other features in dyeing or printing textiles, or dyeing leather, furs, or solid macromolecular substances in any form
- D06P5/13—Fugitive dyeing or stripping dyes
- D06P5/132—Fugitive dyeing or stripping dyes with oxidants
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06L—DRY-CLEANING, WASHING OR BLEACHING FIBRES, FILAMENTS, THREADS, YARNS, FABRICS, FEATHERS OR MADE-UP FIBROUS GOODS; BLEACHING LEATHER OR FURS
- D06L4/00—Bleaching fibres, filaments, threads, yarns, fabrics, feathers or made-up fibrous goods; Bleaching leather or furs
- D06L4/10—Bleaching fibres, filaments, threads, yarns, fabrics, feathers or made-up fibrous goods; Bleaching leather or furs using agents which develop oxygen
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06L—DRY-CLEANING, WASHING OR BLEACHING FIBRES, FILAMENTS, THREADS, YARNS, FABRICS, FEATHERS OR MADE-UP FIBROUS GOODS; BLEACHING LEATHER OR FURS
- D06L4/00—Bleaching fibres, filaments, threads, yarns, fabrics, feathers or made-up fibrous goods; Bleaching leather or furs
- D06L4/10—Bleaching fibres, filaments, threads, yarns, fabrics, feathers or made-up fibrous goods; Bleaching leather or furs using agents which develop oxygen
- D06L4/12—Bleaching fibres, filaments, threads, yarns, fabrics, feathers or made-up fibrous goods; Bleaching leather or furs using agents which develop oxygen combined with specific additives
-
- 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
- D06P5/00—Other features in dyeing or printing textiles, or dyeing leather, furs, or solid macromolecular substances in any form
- D06P5/02—After-treatment
-
- 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
- D06P5/00—Other features in dyeing or printing textiles, or dyeing leather, furs, or solid macromolecular substances in any form
- D06P5/02—After-treatment
- D06P5/10—After-treatment with compounds containing metal
-
- 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
- D06P5/00—Other features in dyeing or printing textiles, or dyeing leather, furs, or solid macromolecular substances in any form
- D06P5/13—Fugitive dyeing or stripping dyes
Definitions
- the present invention relates to a process for lightening or bleaching dyed cotton fabrics in the absence of added hypochlorites, permanganates and enzymes, and to a lightening bath suitable for carrying out this process.
- hypochlorite bleaching As an alternative to hypochlorite bleaching, the use of dextrose as a reducing agent is known, but it has the disadvantage that the treatment temperature must be at least 80 ° C. and the pH of the whitening bath must be adjusted to 13. Furthermore, the use of ozone Known as an oxidizing agent for the lightening of dyed cotton fabrics, but this process has the disadvantage that the handling of ozone in technical production processes is quite difficult. In addition, the treatment with ozone severely damages the cotton fiber. Furthermore, ketone derivatives are known as reducing agents for lightening cotton fabrics.
- the lightening of colored textiles in the presence of an enzyme such as peroxidase or oxidase and H 2 0 2 as an oxidizing agent is known (W092 / DK / 119).
- an enzyme such as peroxidase or oxidase and H 2 0 2 as an oxidizing agent
- this process is not cost-effective and is therefore not suitable for large-scale processes.
- the object of the present invention was therefore to at least partially avoid the disadvantages of the prior art and to provide a process for lightening colored cotton fabrics which is comparable in terms of the effect achieved and the costs to the use of hypochlorite, but the advantage of less BOD 5 and COD values in wastewater on ice.
- the object of the invention is achieved by a one-step process for lightening dyed cotton fabrics, which is characterized in that dyed cotton fabrics are treated under conditions suitable for lightening the colors of the cotton fabrics with an aqueous bath containing a peroxo compound as an active component, but no added hypochlorites Contains permanganates and enzymes.
- peroxo compounds as a lightening agent for dyed cotton fabrics, in particular for jeans fabrics, has a very good effect.
- the method according to the invention has the advantage over known methods that wastewater pollution is avoided, since an AOX contamination by hypochlorites does not occur and other environmentally harmful chemicals do not have to be used or only to a small extent.
- the COD and BOD 5 values as wastewater pollution values are not increased by the peroxo compound, but contrary effects can even occur, since peroxo compounds also enter oxygen and thus reduce the oxygen demand of the wastewater.
- the method according to the invention is preferably carried out using a lightening bath which contains the smallest possible amounts of Chlorine, especially less than 5000 ppm, particularly preferably less than 1000 ppm and most preferably less than 200 ppm chlorine (in the form of elemental chlorine, chlorite, hypochlorite etc.).
- the conditions suitable for lightening or bleaching the colors of the cotton fabrics are to be understood as those conditions of the concentration of the lightening bath, the temperature and the duration of treatment at which the desired lightening of the colors is achieved without damaging the cotton fiber.
- Inorganic peroxides selected from the group consisting of H 2 O 2 , perphosphates, perborates, percarbonates, persulfates, percarbamide, peracetic acid and mixtures thereof are preferably used as suitable peroxo compounds for the process according to the invention.
- the peroxo compound is particularly preferably a persulfate, ie a peroxodisulfate, a peroxomonosulfate or mixtures thereof, and most preferably a peroxodisulfate.
- alkaline earth metal eg Ca
- alkali metal eg Li, Na, K, Rb, Cs
- ammonium peroxodisulfate and in particular potassium, sodium or / and ammonium peroxodisulfate are preferred among the peroxodisulfates.
- organic peroxides such as ketone peroxides, hydroperoxides, diacyl peroxides or peresters can also be used.
- the concentration of the peroxo compound can be varied depending on the reaction conditions and the desired degree of lightening of the cotton fabrics.
- the peroxo compound can be varied in a concentration of about 21 mmol / l (corresponding to about 5 g / l for sodium peroxodisulfate) up to the solubility limit of the compound or up to a concentration above which an attack on the cotton fiber takes place.
- the concentration of the peroxo compound in the lightening bath is preferably in the range from 21 mmol / 1 to 2.1 mol / 1, particularly more preferably in the range from 42 mmol / 1 to 1.7 trtol / 1 and most preferably from 42 mmol / 1 to 1.3 mol / 1.
- the temperature for carrying out the process according to the invention is advantageously in the range from 15 to 90 ° C., preferably from 40 to 80 ° C. and most preferably from 50 to 65 ° C.
- the time for carrying out the lightening process according to the invention depends on the desired degree of lightening, the temperature of the lightening bath and the concentration of the lightening reagent. This period of time can easily be determined by a person skilled in the art by routine experiments.
- the reaction time is generally 2 minutes to 20 hours, preferably 5 minutes to 5 hours and particularly preferably 15 minutes to 1 hour.
- the pH of the lightening bath can range from 0 to 12, with pH values in the range from 1 to 10 being preferred and in the range from 4 to 7 being particularly preferred.
- the lightening bath can be a buffer system, e.g. contain a phosphate buffer.
- surfactants e.g. Surfactants, complexing agents and other agents known in the relevant art.
- the process according to the invention can be carried out in conventional devices and with customary amounts of cotton, which are also used, for example, to carry out a hypochlorite bleaching process.
- the dyed cotton fabrics are preferably treated in a washing drum with the lightening bath according to the invention.
- the lightening bath additionally contains an activator which is selected from transition metal compounds and / or halide compounds. Examples of typical transition metals are titanium, vanadium, chromium, manganese, iron, cobalt, nickel, copper, zinc, palladium, tin, molybdenum, silver, cerium, rhutenium, tungsten and rhenium.
- transition metals are iron, copper, cobalt, zinc, silver, manganese, chromium, nickel or mixtures thereof.
- the transition metals can be used in the form of metal salts or complex compounds, with metal salts being preferred.
- the transition metals are particularly preferably used in the form of their sulfate salts.
- Iron (III) salts, iron (II) salts and copper (II) salts, in particular iron (III) sulfate, iron (II) sulfate and copper (II) sulfate are on most preferred.
- the transition metal compound used as the activator is preferably added to the lightening bath according to the invention in an amount of up to 25 mmol / l, based on the metal. It is preferred to use the. Transition metal compound in an amount of 0.05 to 15 mmol / 1, particularly preferably from 0.05 to 8 mmol / 1 based on the metal.
- halide compounds which are suitable as activators are chloride, bromide and iodine compounds, in particular the bromide compounds.
- Ammonium, alkali metal and alkaline earth metal halides are preferred, with alkali metal halides being particularly preferred. Most preferred are sodium and / or potassium bromide.
- the halide compound used as the activator is preferably added to the brightening bath according to the invention in an amount of up to 500 mmol / l, based on the halide ion.
- the halide compound is particularly preferably used in an amount of 0.5 mmol / 1 to 200 mmol / 1, most preferably 1 to 20 mmol / 1, based on the halide ion.
- activation with halide ions and in particular with bromide ions has the advantage that the concentration of the peroxo compound can be significantly reduced without deteriorating the bleaching effect.
- concentrations in the range from 21 mmol / 1 to 420 mmol / 1 persulfate (corresponding to 5 to 100 g / 1 for sodium peroxodisulfate) and 0.5 to 200 mmol / 1, in particular 1 to 20 mmol / 1 bromide is particularly preferred, with optimal effects being achieved even at very low bromide concentrations.
- care is preferably taken to ensure that the concentrations of the halide compound and the peroxo compound are inversely proportional within the specified ranges.
- Another embodiment of the present invention comprises treating the dyed cotton fabrics at an alkaline pH.
- the treatment of the cotton fabrics in alkaline has the advantage that attack by H + ions, which can lead to a reduction in the tensile strength, is completely ruled out.
- the treatment is preferably carried out at a pH range from 9 to 13, particularly preferably from 10 to 12. Since peroxo compounds, for example persulfates, only show a moderate brightening effect in alkaline without added hypochlorite, an activator suitable for alkaline pH values is preferably used. Examples of such activators are transition metal complex compounds which are soluble at alkaline pH values, eg complex compounds of iron, copper, cobalt or nickel, particularly preferably complex compounds of iron.
- Suitable activators are complexes of transition metals with ammonia, polyamines such as EDTA, rhodanide, cyanide or fluoride.
- Cyano complexes are preferably used, particularly preferably hexacyanoferrate (II) or hexacyanoferrate (III) complexes.
- the hexacyanoferrate complexes are e.g. in the form of alkali metal salts, e.g. of sodium or potassium salts.
- the complexes are preferably present in an amount of up to 25 mmole / l based on the metal, particularly preferably in an amount of 0.05 to 15 mmole / l, most preferably 0.05 to 8 mmole / l based on the metal used.
- the concentration of the peroxo compounds when lightening in alkaline is therefore in the range of e.g. 5 mmol / 1 to 2.1 mol / 1, preferably 5 mmol / 1 to 1 mol / 1, particularly preferably 5 mmol / 1 to 250 mmol / 1.
- the treatment temperature is preferably 70 to 90 ° C, particularly preferably about 80 ° C.
- the treatment time depends on the concentration of the peroxo and activator compounds used, but good results have been achieved with a treatment time in the range from 10 minutes to 1 hour, in particular from 10 minutes to 30 minutes.
- the dyed cotton fabrics used for the process according to the invention are preferably dyed with dyes selected from the group consisting of vat, direct and sulfur dyes.
- Typical vat dyes are indigo, thioindigo and other indigoide dyes, indanthrene and other antrachinoid dyes, phthalocyanine and naphthalene dyes.
- Particularly preferred dyes are all substances used for dyeing cotton fabrics, in particular denim fabrics, in particular indigo, thioindigo and other indigo dyes and sulfur dyes.
- the dyed cotton or jeans fabrics After the dyed cotton or jeans fabrics have been lightened by the process according to the invention, they are washed in the usual way, e.g. cleaned from the whitening bath by rinsing and / or neutralizing. Since no discoloration, e.g. After treatment, yellowing that occurs in cotton fibers is generally not necessary.
- Another advantage of the method according to the invention is that the degree of lightening, i.e. the lightening of the overall color tone of the dyed cotton fabrics can be controlled very well by selecting the treatment duration and temperature, the concentration of the peroxo compound and, if appropriate, the activator compound.
- the wastewater does not contain any environmentally harmful chemicals, since sodium peroxodisulfate decomposes into sodium sulfate and oxygen and also iron sulfate is not a problem, since this substance is added as a flocculant in sewage treatment plants, for example .
- peroxo compounds, in particular persulfates in the brightening bath, additional oxygen is even introduced into the bath and the oxygen demand of the waste water is thus reduced.
- halide ions in particular bromide ions in the low concentrations which are required to activate the peroxo compound, does not result in any significant environmental pollution.
- Another object of the present invention is the use of a bath which contains 21 mmol / 1 to 2.1 mol / 1 of a peroxo compound as an active component and is free from added hypochlorites, permanganates and enzymes for the brightening of dyed cotton fabrics.
- the peroxo compound is preferably selected from the group consisting of H 2 0 2 , perphosphates, perborates, percarbonates, persulfates, percarbamide, peracetic acid and mixtures thereof.
- a peroxodisulfate is particularly preferred as the peroxo compound, most preferably potassium, sodium or / and ammonium peroxodisulfate.
- the bath can also contain an activator selected from transition metal compounds in a concentration of up to 25 mmol / 1 based on the metal or halide compounds in a concentration of up to 500 mmol / 1 based on the halide ion.
- the bath particularly preferably contains 21 mmol / 1 to 420 mmol / 1 of a persulfate as active component and 0.5 to 200 mmol / 1 halide ions as activator.
- Another object of the present invention is the use of a bath, which has an alkaline pH, as active components 5 mmol / 1 to 2.1 mol / 1 of a peroxo compound and a transition metal which is soluble at alkaline pH values -Complex compound contains and is free of added hypochlorites, permanganates and enzymes, for the lightening of colored cotton fabrics.
- the invention is further illustrated by the following example.
- a 4 x 4 cm sample of indigo-dyed blue jeans fabric was placed in 100 ml of a lightening bath. Then the pH was determined. During the lightening process, stirring was carried out continuously to ensure good penetration of the tissue with the lightening solution. The textile piece was then rinsed with distilled water to stop the lightening process. Assessing the whitening degrees were done in a dry state (hot air dried at 50 ° C in a drying cabinet) with an unlightened textile sample as a reference. The degree of brightening effect (decrease in blue color to white) was evaluated in 5 stages as follows:
- APS ammonium peroxodisulfate
- KPS potassium peroxodisulfate
- NPS sodium peroxodisulfate
- APS (Vers. 1) and NPS (Vers. 3) in particular show a useful bleaching effect.
- KPS has a lower solubility, but its bleaching effect is comparable to APS and NPS relative to the amount used.
- transition metal compounds especially iron (III) in the form of iron (III) sulfate, iron (II) sulfate or copper (II) sulfate, intensify the attack of persulfate on the indigo dye. It is noteworthy that there is no significant damage to the tissue.
- Experiments 9 to 16 show that different activators are suitable for this application. Iron (III) (experiment 9), chromium (experiment 14) and iron (II) (experiments 15 and 16) had the greatest effect.
- Experiments 26 to 30 show various activators with ammonium peroxodisulfate as a bleaching agent. Copper and iron are particularly suitable.
- iodide is also suitable, but it turns yellow.
- Discoloration can be increased.
- Experiments 43 and 44 show that only little bleaching takes place in the alkaline state without the addition of an activator.
- Experiments 45 and 46 show that the addition of an activator in the alkaline range significantly increases the bleaching effect of persulfate.
- Experiment 47 shows that no effect of the activator can be seen in the neutral range (pH 7.5).
- Experiment 52 shows that the activator concentration can still be reduced to approximately 1 mmol / l without a reduction in the brightening effect being found.
- Experiment 53 shows that a strong bleaching effect is achieved even at a pH of 12.
- Experiment 55 shows that a further reduction in the ⁇ .Aktivators in the bleaching solution, the effect of the whitening can be controlled.
Landscapes
- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Treatment Of Fiber Materials (AREA)
- Detergent Compositions (AREA)
- Coloring (AREA)
Description
Claims
Applications Claiming Priority (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE4402542 | 1994-01-28 | ||
DE4402542 | 1994-01-28 | ||
DE4427662A DE4427662A1 (de) | 1994-01-28 | 1994-08-04 | Bleichen von Jeans |
DE4427662 | 1994-08-04 | ||
PCT/EP1995/000288 WO1995020643A1 (de) | 1994-01-28 | 1995-01-26 | Bleichen von jeans |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0741777A1 true EP0741777A1 (de) | 1996-11-13 |
EP0741777B1 EP0741777B1 (de) | 1997-11-05 |
Family
ID=25933352
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP95906992A Expired - Lifetime EP0741777B1 (de) | 1994-01-28 | 1995-01-26 | Bleichen von jeans |
Country Status (6)
Country | Link |
---|---|
EP (1) | EP0741777B1 (de) |
AT (1) | ATE159980T1 (de) |
AU (1) | AU681490B2 (de) |
CA (1) | CA2181813A1 (de) |
GR (1) | GR3025703T3 (de) |
WO (1) | WO1995020643A1 (de) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102014207727A1 (de) | 2014-04-24 | 2015-10-29 | Cht R. Beitlich Gmbh | Verfahren zum Aufhellen von gefärbten Textilien |
EP4053328A1 (de) | 2021-03-02 | 2022-09-07 | CHT Germany GmbH | Kombinierte bleichbehandlung für textilien |
Family Cites Families (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE747889C (de) * | 1940-12-14 | 1944-10-20 | Verfahren zum Bleichen von Zellstoff | |
DE868287C (de) * | 1951-03-10 | 1953-02-23 | Basf Ag | Verfahren zur Herstellung echter Faerbungen auf Fasermaterial |
NL233674A (de) * | 1956-07-18 | |||
US4116878A (en) * | 1974-06-14 | 1978-09-26 | Lever Brothers Company | Detergent composition |
JPS5331871A (en) * | 1976-09-02 | 1978-03-25 | Kao Corp | Bleaching agent composition safe to color of textile goods |
JPS54116489A (en) * | 1978-02-23 | 1979-09-10 | Mitsubishi Gas Chemical Co | Washing of fiber product dyed by metal containing dyestuff |
JPS54116491A (en) * | 1978-02-24 | 1979-09-10 | Mitsubishi Gas Chemical Co | Washing of fiber product dyed by metal containing dyestuff |
BE1004693A3 (nl) * | 1991-03-07 | 1993-01-12 | Publar Anstalt | Werkwijze voor het behandelen van textiel en produkt voor het uitvoeren daarvan. |
DE4130484A1 (de) * | 1991-09-13 | 1993-03-18 | Bayer Ag | Verfahren zum nachbleichen gefaerbter rohcellulose |
-
1995
- 1995-01-26 AU AU15365/95A patent/AU681490B2/en not_active Ceased
- 1995-01-26 AT AT95906992T patent/ATE159980T1/de active
- 1995-01-26 EP EP95906992A patent/EP0741777B1/de not_active Expired - Lifetime
- 1995-01-26 CA CA002181813A patent/CA2181813A1/en not_active Abandoned
- 1995-01-26 WO PCT/EP1995/000288 patent/WO1995020643A1/de active IP Right Grant
-
1997
- 1997-12-17 GR GR970403354T patent/GR3025703T3/el unknown
Non-Patent Citations (1)
Title |
---|
See references of WO9520643A1 * |
Also Published As
Publication number | Publication date |
---|---|
WO1995020643A1 (de) | 1995-08-03 |
CA2181813A1 (en) | 1995-08-03 |
AU1536595A (en) | 1995-08-15 |
EP0741777B1 (de) | 1997-11-05 |
ATE159980T1 (de) | 1997-11-15 |
AU681490B2 (en) | 1997-08-28 |
GR3025703T3 (en) | 1998-03-31 |
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