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
  • D06L1/00—Dry-cleaning or washing fibres, filaments, threads, yarns, fabrics, feathers or made-up fibrous goods
  • D06L1/02—Dry-cleaning or washing fibres, filaments, threads, yarns, fabrics, feathers or made-up fibrous goods using organic solvents
  • D06L1/06—De-sizing
• • 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
  • D06L1/00—Dry-cleaning or washing fibres, filaments, threads, yarns, fabrics, feathers or made-up fibrous goods
  • D06L1/12—Dry-cleaning or washing fibres, filaments, threads, yarns, fabrics, feathers or made-up fibrous goods using aqueous solvents
  • D06L1/14—De-sizing
• • 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 desizing and bleaching of fabrics with cellulose fibers is usually carried out continuously in several process stages.
• the starch (size) applied before the weaving process is removed, for example with enzymes (amylases).
• This process is generally followed by treatment with alkali.
• the fabric is impregnated with solutions which, in addition to sodium hydroxide solution, can also contain surfactants and, if necessary, complexing agents.
• the fabric is then steamed for up to 60 minutes. If there is no suitable damper available, the effect can also take several hours at room temperature.
• the alkali and impurities in the cotton are then removed by hot washing and rinsing.
• Another step is bleaching with hydrogen peroxide.
• the fabric is impregnated with a bleaching liquor which, in addition to hydrogen peroxide, also contains alkali in the form of sodium hydroxide solution.
• the sodium hydroxide solution is required to activate the hydrogen peroxide and the work is carried out to achieve a good bleaching action at pH values above 10, preferably above pH 12.
• stabilizers are necessary.
• the most common stabilizer is water glass (sodium silicate), which releases oxygen in a controlled manner due to its buffering effect and also prevents catalytic decomposition by incorporating heavy metal ions into its molecular chain.
• the disadvantage here is that sodium silicate is difficult to remove from the tissue. bar and thus often leads to an unpleasant, sandy grip on the fabric. Furthermore, it can easily build up deposits pparatedin of Sililkatresten on the machine parts such as rollers, A sth. come. For this reason, efforts are being made to replace water glass with other, mostly organic stabilizers, for example based on salts of ethylenediaminetetraacetic acid. However, these stabilizers mostly lack the buffering effect of sodium silicate, so that the release of oxygen is less controlled and the bleaching effects are worse. With this sequence of process stages, one obtains not only a high bleaching effect but also a perfect desizing.
• the process according to the invention is carried out by the processes customary for bleaching, for example in the form of hot or cold bleaching.
• the fabric is impregnated with a liquor of the composition described above, squeezed to a liquor absorption of approximately 60 to 120% by weight and then heated with steam to a temperature of approximately 40 to 140, preferably 80 to 105 ° C. .
• the duration of treatment depends on the respective temperature and can be between about 2 minutes and several hours.
• cold bleaching the impregnated goods are left to stand at room temperature for 8 to 24 hours, preferably 12 to 18 hours, depending on the degree of desizing and bleaching required. In both cases, the goods are finally washed and dried.
• the fabric can also be treated continuously in a long liquor of the composition given above, for example at a liquor ratio of approximately 1:10.
• the temperature of the bath is about 50 to 95 ° C, preferably 60 to 85 ° C, and the treatment time is about 10 up to 40 minutes.
• the hydrogen peroxide required for the process according to the invention is preferably used in the form of the commercially available aqueous 35% solution.
• the above-mentioned limit values of 10 and 80 ml for hydrogen peroxide relate to this concentration.
• All products that are known to the person skilled in the art under this term are suitable as surfactants.
• Commercial surfactants are preferably taken from the following groups: sec. Alkanesulfonates, alkylphenolsulfonates, nonylphenol oxethylates and fatty alcohol oxethylates. These surfactants serve for better wetting of the goods with the fleet.
• Sodium bicarbonate and triethanolamine in particular are used as weakly alkaline compounds.
• Peroxide activators are all compounds which are already known for this purpose, such as acylated hydroxylamines, acylamides and acylated heterocycles (see text. Kir Intern. 1974, p. 1392 ff.). Particularly preferred acyl compounds are tetraacetylethylenediamine and tetraacetylglycoluril.
• the method according to the invention permits simultaneous desizing and bleaching in a bath, which results in a significant simplification in comparison with the conventional procedure with a separate bleaching and desizing bath.
• Another major advantage of the process described here is that one only works in the weakly alkaline range. This avoids the risk of damage to the fibers due to degradation, as can occur with the usual bleaching in the strongly alkaline range.
• one can do without the otherwise usual stabilization of the bleaching bath and thus avoid the disadvantages mentioned at the outset, which are associated with the use of water glass as a stabilizing agent.
• a cotton batiste was impregnated with a fleet after the singeing contained.
• the liquor absorption was 70% by weight.
• the fabric was heated to 100 ° C. and stored in a storage device at this temperature for 20 minutes. It was then washed or rinsed twice on a continuous washing machine at 90 ° C., twice at 60 ° C. and twice.
• the material had the following data:
• a shirt fabric made of polyester / cotton 50:50 was impregnated with the following bleaching solution: The fleet uptake was 70%.
• the fabric was wound up on a dock and allowed to remain for 1G hours at room temperature. It was then washed out continuously on 2 units of a 6-box washing machine with the addition of 3 ml / l sodium hydroxide solution 50% and 3 ml / 1 of the surfactant mixture specified above. In 2 further boxes, cold rinsing was carried out at 60 ° C. and twice.
• the fabric showed the following values:
• the treatment fleet in the mesh trough and in the dwell device had the following composition:
• the residence time in the liquor store was 25 minutes at 85 ° C.
• the fabric After washing, rinsing and drying, the fabric had the following values:
• a cotton nettle was impregnated with a liquor containing 40 g / 1 caustic soda and 5 g / 1 surfactant (60% alkane sulfonate) without desizing.
• the fleet uptake was 85%.
• the fabric was then impregnated with the following liquor without intermediate drying:
• the squeezing effect was 90% and the liquor exchange during the impregnation was found to be 85%.
• the material was also brought to 100 ° C. with steam and left at this temperature for 30 minutes. Subsequently it was given in the above Way washed and rinsed.
• the goods had the following properties:

Landscapes

• Engineering & Computer Science (AREA)
• Textile Engineering (AREA)
• Treatments For Attaching Organic Compounds To Fibrous Goods (AREA)
• Detergent Compositions (AREA)
• Chemical Or Physical Treatment Of Fibers (AREA)
• Chemical And Physical Treatments For Wood And The Like (AREA)
• Solid-Sorbent Or Filter-Aiding Compositions (AREA)

Applications Claiming Priority (2)

Publications (3)

Family

ID=6164035

Family Applications (1)

Country Status (8)

Cited By (5)

Families Citing this family (7)

Family Cites Families (9)

• 1982
  • 1982-05-19 DE DE3218889A patent/DE3218889A1/de not_active Withdrawn
• 1983
  • 1983-05-09 US US06/492,821 patent/US4539007A/en not_active Expired - Fee Related
  • 1983-05-14 DE DE8383104775T patent/DE3365270D1/de not_active Expired
  • 1983-05-14 EP EP83104775A patent/EP0094656B1/fr not_active Expired
  • 1983-05-17 KR KR1019830002162A patent/KR840004797A/ko not_active Application Discontinuation
  • 1983-05-18 CA CA000428438A patent/CA1202919A/fr not_active Expired
  • 1983-05-18 BR BR8302622A patent/BR8302622A/pt unknown
  • 1983-05-18 JP JP58085975A patent/JPS58208463A/ja active Pending
  • 1983-05-18 ZA ZA833571A patent/ZA833571B/xx unknown

Non-Patent Citations (1)

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