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
  • D06L4/10—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

Definitions

• the raw textile goods are bleached in order to prepare them for dyeing or for finishing. So far, it has been common to use bleaching agents such as hydrogen peroxide, sodium hypochlorite or sodium chlorite.
• hypochlorites in bleaching processes results in organohalogen compounds which can be harmful to health. This leads to an increasing omission of this bleaching agent.
• Sodium chlorite bleaching carried out in the acidic pH range leads to the formation of chlorine dioxide, which is harmful to health and represents an unpleasant smell.
• this bleach can only be used on selected textile machines consisting of special materials.
• Activation with bases is common and best known.
• sodium hydroxide is used almost exclusively for cotton, and soda is preferred for bast fibers - especially linen.
• bases are alkali sensitivity of animal fibers.
• hydrogen peroxide can be activated in other ways, e.g. B. by chemical conversion of the hydrogen peroxide to organic and inorganic peracids.
• those compounds which have a large number of reactive acyl groups such as tetraacetylethylenediamine (TAED) and tetraacetylglycoluril (TAGU), have proven particularly effective, with the smallest possible molecular weight.
• TAED tetraacetylethylenediamine
• TAGU tetraacetylglycoluril
• DE-OS-1 695 219 discloses the use of acylated glycolurils, in particular TAGU, as bleaching agents, especially when bleaching fibers of all kinds.
• EP-A-125 641 and US-A-4 544 503 disclose the use of acyloxybenzenesulfonic acid salts (AOBS) as activators for peroxide bleaching of fabrics and as dyeing aids in dyeing acrylic fibers.
• AOBS acyloxybenzenesulfonic acid salts
• EP-A-442 549 mentions the use of phthalimidoperoxycarboxylic acids as bleaching agents for fabrics and hard surfaces.
• DE-OS-1 291 317 describes a bleaching process which is suitable for removing stains on textiles by means of peroxide baths containing organic N-acyl compounds.
• N-acetylcaprolactam is also mentioned as an activating agent for the inorganic persalts used, such as sodium perborate tetrahydrate, sodium perborate and sodium percarbonate.
• EP-A-0 584 710 mentions a process for sheet metal raw textile with the aid of organic peracids and hydrogen peroxide, in which the bleaching liquor contains a carboxylic acid amide, carboxylic acid ester or sulfonic acid salt as bleach activator.
• the solid bleach activators described have the disadvantage that they cannot be used for the metering systems for liquid substances found in the textile industry.
• the object of the present invention is to provide suitable liquid bleach activators for the sheet metal of textile raw material.
• the preferred bleach activator is N-acetylcaprolactam.
• cellulose in particular untreated natural cellulose, such as hemp, linen, jute, cotton, regenerated cellulose fibers, such as cellulose, viscose acetate, rayon, animal fibers, such as wool and silk, and chemical fibers, such as polyamide, polyacrylonitrile or polyester fiber materials as well as fiber blends,
• e.g. B those made of polyacrylonitrile cotton or polyester cotton.
• the textile material to be treated can be present in the various processing stages, e.g. B. the cellulose-containing material as a loose material fleet, sliver, yarn, knitted fabric, woven or knitted fabric.
• the textile material is treated continuously (e.g. by impregnation) or discontinuously (e.g. using a pull-out process in a bleaching machine) in an aqueous liquor.
• the aqueous bleaching liquor contains hydrogen peroxide and, if appropriate, peroxide stabilizers, detergents and wetting agents, additives such as defoamers and solution improvers, buffer systems such as phosphate salts and citric acid and basic salts such as sodium hydrogen carbonate, disodium carbonate and / or sodium hydroxide.
• the pH of the bleaching liquor is in a range from 5 to 13, preferably 7 to 9.
• the molar ratio of hydrogen peroxide to bleach activator is 1.0-5: 1, preferably 1.1-1.5: 1, based on the active carbonyl group of the bleach activator.
• the bleaching liquor can be produced in the liquor preparation container in the manner described above or can be metered directly into the bleaching apparatus or the impregnation skid using metering devices together with the other liquid constituents of the bleaching liquor.
• the goods are wetted with the bleaching liquor and soaked, so that the weight of the liquor is usually 3 to 50 times the weight of the goods.
• the textile raw material is treated cold with the bleaching liquor or heated together with the bleaching liquor to temperatures of 40 to 130 ° C. and treated at these temperatures. Treatment times of 30 minutes to 3 hours are usual.
• the textile raw material is impregnated with the bleaching liquor in the impregnation skid, that is to say the raw material is treated with the bleaching liquor by wetting and soaking.
• the textile raw material is either stored cold over a period of 0.5 to 24 hours, usually at room temperature, or heated to temperatures of 95 ° C. to 120 ° C. in atmospheric steamers with steam. The residence time at this temperature is 1 minute to 2 hours.
• the bleaching with the bleach activators according to the invention is followed by a further bleaching process, e.g. alkaline peroxide bleaching.
• the liquor batch is carried out in the liquor batch container.
• the goods are padded cold and steamed for 15 - 30 minutes under saturated steam at a temperature of 97 - 102 ° C. This is followed by washing.
• the goods are impregnated wet-on-wet with an alkaline peroxide bleaching liquor.
• the impregnated goods are steamed for 15-20 minutes under saturated steam and then washed.
• the liquor ratio of textile goods to bleaching liquor is 1:10.
• the bleaching liquor contains 1 g / I ®Hostapal FA 1 g / I ®Lastabil TGS 2 g / I calcined soda 2 g / IH 2 0 2 (35% aqueous solution) 3 g / I N-acetylcaprolactam
• the bleaching liquor is heated to 95 ° C. and held at this temperature for 1 hour. The liquor is then drained off and the goods are rinsed with warm water (60 ° C).
• the goods are desized.
• the goods are impregnated with the bleaching liquor and are left at room temperature (20 - 30 ° C) for 18 hours. The goods are then washed with hot water.

Landscapes

• Engineering & Computer Science (AREA)
• Textile Engineering (AREA)
• Detergent Compositions (AREA)
• Treatments For Attaching Organic Compounds To Fibrous Goods (AREA)
• Coloring (AREA)
• Chemical Or Physical Treatment Of Fibers (AREA)

Applications Claiming Priority (2)

Publications (2)

Family

ID=6515087

Family Applications (1)

Country Status (5)

Cited By (2)

Families Citing this family (1)

Family Cites Families (3)

• 1994
  • 1994-04-11 DE DE4412390A patent/DE4412390A1/de not_active Withdrawn
• 1995
  • 1995-04-04 EP EP95105011A patent/EP0676499A3/fr not_active Withdrawn
  • 1995-04-10 KR KR1019950008227A patent/KR950032867A/ko not_active Withdrawn
  • 1995-04-10 CA CA002146713A patent/CA2146713A1/fr not_active Abandoned
  • 1995-04-10 JP JP7084331A patent/JPH0835171A/ja not_active Withdrawn

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