EP0164534B1 - Procédé de blanchiment à l'hypochlorite et à des températures élevées de tissus contenant du coton - Google Patents

Procédé de blanchiment à l'hypochlorite et à des températures élevées de tissus contenant du coton Download PDF

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Publication number
EP0164534B1
EP0164534B1 EP85104913A EP85104913A EP0164534B1 EP 0164534 B1 EP0164534 B1 EP 0164534B1 EP 85104913 A EP85104913 A EP 85104913A EP 85104913 A EP85104913 A EP 85104913A EP 0164534 B1 EP0164534 B1 EP 0164534B1
Authority
EP
European Patent Office
Prior art keywords
bleaching
hypochlorite
cotton
elevated temperatures
minutes
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
Application number
EP85104913A
Other languages
German (de)
English (en)
Other versions
EP0164534A3 (en
EP0164534A2 (fr
Inventor
Werner Dr. Streit
Dieter Bassing
Karlheinz Dr. Gebert
Friedrich Klippel
Norbert Leppert
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.)
BASF SE
Original Assignee
BASF SE
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Filing date
Publication date
Application filed by BASF SE filed Critical BASF SE
Priority to AT85104913T priority Critical patent/ATE41957T1/de
Publication of EP0164534A2 publication Critical patent/EP0164534A2/fr
Publication of EP0164534A3 publication Critical patent/EP0164534A3/de
Application granted granted Critical
Publication of EP0164534B1 publication Critical patent/EP0164534B1/fr
Expired legal-status Critical Current

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Classifications

    • 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
    • D06L4/20—Bleaching fibres, filaments, threads, yarns, fabrics, feathers or made-up fibrous goods; Bleaching leather or furs using agents which contain halogen
    • D06L4/22—Bleaching fibres, filaments, threads, yarns, fabrics, feathers or made-up fibrous goods; Bleaching leather or furs using agents which contain halogen using inorganic agents
    • D06L4/23—Bleaching fibres, filaments, threads, yarns, fabrics, feathers or made-up fibrous goods; Bleaching leather or furs using agents which contain halogen using inorganic agents using hypohalogenites
    • 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
    • D06L4/20—Bleaching fibres, filaments, threads, yarns, fabrics, feathers or made-up fibrous goods; Bleaching leather or furs using agents which contain halogen
    • D06L4/21—Bleaching fibres, filaments, threads, yarns, fabrics, feathers or made-up fibrous goods; Bleaching leather or furs using agents which contain halogen combined with specific additives

Definitions

  • Cotton fabrics and blends containing cotton are bleached in the textile industry mainly with hydrogen peroxide or with hypochlorite. Under certain circumstances, both bleaching processes are used in succession.
  • Hypochlorite bleaching is usually carried out at room temperatures of 20 to 25 ° C and a pH of 9.5 to 12. The duration of the treatment varies between 20 minutes and several hours, depending on the amount of active chlorine used.
  • hypochlorite has a more or less damaging effect on cotton fibers, depending on the conditions.
  • the manual of textile auxiliaries from Chwala / Angerer, Verlag Chemie, Weinheim-New York, 1977, pages 343/344 clearly shows that technical textile bleaching with sodium hypochlorite is carried out at temperatures of 35 ° C or less and within a pH range from 9.5 to 12 must be worked to keep the fiber damage as low as possible. Increasing the temperature by 10 ° C doubles the bleaching speed, but also causes greater fiber damage.
  • hypochlorite bleach can be combined with a subsequent hydrogen peroxide bleach in order to obtain a special degree of whiteness and high absorbency.
  • the alkaline peroxide solution first removes the remaining hypochlorous acid, the chloramines formed from accompanying substances in the cotton, in order to then develop their actual bleaching effect. Fiber protection agents are essential.
  • the object of the invention is to demonstrate a bleaching process with hypochlorite which can be carried out at higher temperatures.
  • a process has now been found for bleaching cotton and cotton-containing fabrics or yarns with hypochlorite in alkaline aqueous liquors at higher temperatures, which is characterized in that the bleaching is carried out at temperatures from 80 to 110 ° C. within 30 seconds to 25 minutes in the presence from 0.5 to 20 g / l of a water-soluble polyhydroxy compound which is stable to hypochlorite at room temperature and easily oxidized in the heat.
  • the invention lies in the combination of hypochlorite or hypochlorite-releasing compounds with an easily oxidizable substance and the unforeseeable effect lies in particular in the fact that higher alkali concentrations, for example from 8 to 60 g / l of sodium hydroxide, can be carried out as previously, without the fibers are damaged and the bleaching effect is not lost.
  • Cotton-containing fabric should be understood to mean pure cotton and in particular polyester blended fabrics with a cotton content of at least 20%. Of course, the corresponding yarns are also included.
  • Alkali hypochlorite in particular sodium hypochlorite, and also compounds which split off hypochlorite, such as dichloro- and trichloroisocyanurate, are used as hypochlorite.
  • the bleaching liquors contain 1 to 8, preferably 2 to 6 g of active chlorine / 1 or the amount that this amount of active chlorine can release.
  • the alkaline aqueous liquors according to the bleaching process according to the invention expediently have a pH of at least 10.
  • This pH range is expediently set by adding alkali metal hydroxide, in particular sodium hydroxide, generally in an amount of 8 to 60 g / l, preferably 10 to 25 g / l.
  • the liquors optionally contain 5 to 15 g / l of alkali carbonate, preferably sodium carbonate.
  • the entire fleet is generally advantageously about 100% by weight, based on the weight of the fabric.
  • a special feature of the method according to the invention is that it is carried out at temperatures from 80 to 110 ° C.
  • the preferred temperature range is from 90 to 103 ° C.
  • Another special feature is the implementation of the bleaching process in the presence of a water-soluble polyhydroxy compound, which is stable to hypochlorite in the cold and at room temperature and easily oxidized in the heat, i. H. with the hypochlorite reacts faster than this with the cellulose units of the cotton.
  • polyhydroxy compounds with an a-hydroxycarbonyl group are excellent from the series of mono-, and oligosaccharides and the series of a-hydroxycarboxylic acids and their derivatives.
  • Polyols such as mannitol, sorbitol, glucitol, glycerol and polyglycerol, and mucochloric acid can also be used.
  • Particularly preferred polyhydroxy compounds to be used according to the invention are glucose, cane sugar and hydroxyacetone.
  • the polyhydroxy compounds are added to the bleaching liquors in an amount of 0.5 to 20 g / l, preferably 1.5 to 10 g / l.
  • the term easily oxidizable is intended to encompass the gradations relatively stable in the cold to hypochlorite and increasing redox potential with increasing alkali concentration and increasing temperature. It is only through this interaction that work can be carried out in the temperature range according to the invention, which was previously not accessible for an industrial textile bleaching process.
  • a particularly noteworthy advantage is that in the bleaching process according to the invention the active chlorine has a very short half-life. As a rule, all active chlorine is used up within the temperature range according to the invention after one minute and is no longer detectable even on the tissue.
  • the method according to the invention is advantageously carried out within 30 seconds to 25 minutes, preferably 1 to 5 minutes.
  • the short half-life has the advantage that, for example when the machine is at a standstill, there can be no damage to the tissue due to a longer oxidation time.
  • peroxides there is no need for stabilization measures, as are common with peroxides, and a much lower sensitivity to contamination should be emphasized with heavy metal.
  • the usual steaming units are useful as a device for the execution.
  • the usual additives for bleaching liquors such as the addition of surfactants as wetting agents and detergents, are expediently used in an amount of 3.0 to 10 g / l and of which alkylphenol ethoxylates with 5 to 10 ethylene oxide units and fatty alcohol ethoxylates with approximately the same degree of ethoxylation are particularly named be.
  • additives relate, for example, to the water hardness of oxidation-stable sequestering agents, which can additionally increase the whiteness. Hydroxyethane diphosphonic acid is particularly suitable for this.
  • the tissue pieces were enzymatically desized and then washed out.
  • the next pre-treatment step is an alkaline decoction (conditions: 40 g / l NaOH, 10 g / l decoction aid, liquor absorption: 100%, time and temperature: 10 minutes at 100 ° C).
  • the fabric pieces were then soaked in bleaching liquor and squeezed to a liquor pick-up of 100%.
  • Polyester / cotton fabric (50/50), desized and boiled with a Tegewa value of 7 to 8, a whiteness of 71.5 (Elrepho units) and a DP value of 2100.
  • Bleaching liquor 10 g sodium hydroxide / i, 5 g / l surfactant, 2.5 g / l active chlorine in the form of sodium hypochlorite.
  • Treatment time 2 minutes at 100 ° C.
  • Bleaching liquor 10 g sodium hydroxide / l, 5 g / l surfactant, 3.0 g / l active chlorine in the form of dichloroisocyanate.
  • Treatment time 2 minutes at 103 ° C.
  • Treatment time 3 minutes at 100 ° C.
  • Cotton shirt poplin desized (Tegewa value 7-8) and boiled, with a whiteness of 70.5 and a DP value of 2500.
  • Bleaching liquor 8.5 g / l NaOH, 5 g / l surfactant, 2.5 g / l active chlorine in the form of sodium hypochlorite, 3.5 g / l glucose.
  • Cotton raincoat poplin desized (Tegewa value: 6-7), boiled, with a whiteness of 68 and a DP value of 2220.
  • Bleaching liquor 15 g / l NaOH, 7 g / l surfactant, 4 g / l active chlorine in the form of chlorine solution, 6 g / l maltose.
  • Treatment time 90 seconds at 103 ° C.
  • Cotton nettle desized (Tegewa value: 7), boiled, with a whiteness of 69 and a DP value of 2320.
  • Bleaching liquor 10 g / l NaOH, 7 g / l surfactant, 3 g / l active chlorine in the form of bleach.
  • Treatment time 1 minute at 101 ° C.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Inorganic Chemistry (AREA)
  • Detergent Compositions (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)

Claims (2)

1. Procédé de blanchiment du coton et de tissus ou fils contenant du coton à l'hypochlorite, dans des bains aqueux alcalins à des températures accrues, caractérisé en ce que le blanchiment est réalisé en l'espace de 30 secondes à 25 minutes à des températures de 80 à 110 °C en présence de 0,5 à 20 g/l d'un composé polyhydroxylé hydrosoluble, qui est stable vis-à-vis de l'hypochlorite à la température ordinaire et aisément oxydable à la chaleur.
2. Procédé suivant la revendication 1, caractérisé en ce que le composé polyhydroxylé ajouté est du glucose, du sucre de canne ou de l'hydroxy-acétone.
EP85104913A 1984-05-16 1985-04-23 Procédé de blanchiment à l'hypochlorite et à des températures élevées de tissus contenant du coton Expired EP0164534B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT85104913T ATE41957T1 (de) 1984-05-16 1985-04-23 Verfahren zum bleichen von baumwollhaltigen geweben mit hypochlorit bei hoeheren temperaturen.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3418109 1984-05-16
DE19843418109 DE3418109A1 (de) 1984-05-16 1984-05-16 Verfahren zum bleichen von baumwollhaltigen geweben mit hypochlorit bei hoeheren temperaturen

Publications (3)

Publication Number Publication Date
EP0164534A2 EP0164534A2 (fr) 1985-12-18
EP0164534A3 EP0164534A3 (en) 1987-04-29
EP0164534B1 true EP0164534B1 (fr) 1989-04-05

Family

ID=6235960

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85104913A Expired EP0164534B1 (fr) 1984-05-16 1985-04-23 Procédé de blanchiment à l'hypochlorite et à des températures élevées de tissus contenant du coton

Country Status (4)

Country Link
US (1) US4622037A (fr)
EP (1) EP0164534B1 (fr)
AT (1) ATE41957T1 (fr)
DE (2) DE3418109A1 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2138061T3 (es) * 1994-06-24 2000-01-01 Procter & Gamble Composiciones blanqueadoras de hipoclorito.
US7109157B2 (en) * 2003-02-27 2006-09-19 Lawnie Taylor Methods and equipment for removing stains from fabrics using a composition comprising hydroxide and hypochlorite
US7585829B1 (en) * 2002-11-06 2009-09-08 Taylor Lawnie H Products, methods and equipment for removing stains from fabrics
US7628822B2 (en) * 2005-04-08 2009-12-08 Taylor Lawnie H Formation of patterns of fades on fabrics
US20070287652A1 (en) * 2006-06-07 2007-12-13 Lhtaylor Assoc, Inc. Systems and methods for making stable, cotton-gentle chlorine bleach and products thereof

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB591537A (en) * 1944-07-18 1947-08-21 Lockport Cotton Batting Co Improvements in bleaching process and composition
DE279993C (fr) *
BE537539A (fr) * 1954-04-21
CA813298A (en) * 1966-07-08 1969-05-20 Colgate-Palmolive Company Bleaching packets
GB1548379A (en) * 1975-05-19 1979-07-11 Jeyes Group Ltd Bleach compositions
US4390448A (en) * 1981-10-22 1983-06-28 International Flavors & Fragrances Inc. Perfumed stable aqueous hypochlorite bleach compositions containing 2-methyl-2-octanol and thickened variation thereof

Also Published As

Publication number Publication date
US4622037A (en) 1986-11-11
DE3418109A1 (de) 1985-11-21
DE3569270D1 (en) 1989-05-11
ATE41957T1 (de) 1989-04-15
EP0164534A3 (en) 1987-04-29
EP0164534A2 (fr) 1985-12-18

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