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
  • 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

• ABSTRACT OF THE DISCLOSURE Method of preventing so-called catalyst injury of textiles during bleachingwitli' peroxidic bleaching agents engendered by presence of iron or iron alloy particles in such textiles which comprises treating such textiles with a hydrazine compound such as hydrazine hydrate and hydrazine salts before or during such bleaching.
• the present invention relates to a method of preventing so-called catalyst injury of textiles during bleaching with peroxidic bleaching agfl ts engendered by the presence of iron or iron alloy particles.
• One of the main sources of the presence of iron dust during bleaching is the grinding dust formed during the grinding of the steel needs of the carding machines or during grinding of the drums of such machines. However, ironfrom other sources can also reach thebleaching apparatus. 5.
• liter of bleaching liquor sufiiceAs a rule, 1 to 3 g. of the hexitols or 1 to 5 g. of theacetates per liter of bleaching'liquor suflice.
• the peroxidic compounds employed in the preparation of peroxidic bleaching liquors are those usually'employed, such as, for example, hydrogen peroxide, soduim peroxide, other alkali metal or alkaline earth metal peroxides, persulfuric acid or its salts, perboric acid or its salts, percarbonic acid or its salts, perphosphoric acid, or its salts United ,States Patent 3,348,903 Patented Oct. 24, 1967 or similar compounds which form hydrogen peroxide in an aqueous acidmedium.
• Such peroxidic bleaching compounds for example, can be employed in such quantities as to provide 0.5 to 7.0 g. of active oxygen per liter of bleaching bath.
• alfurther 100 g. sample of thesame fabric was desized in' the same manner except that the hydrazine hydrate was omitted from the desizing solution.
• Both samples were then given a peroxide bleaching by the impregnating-steaming process in which such samples were, first impregnated with an aqueous bleaching liquor containing 33 cc. Water glass 38/40' B., 8 g. of solid caustic soda, 35. cc. H 0 (35% by weight) and 2 g. of sodium dodecyl benzene sulfonate per liter, then squeezed out to 100% moisture content, and rolled flat on a glass tube and steamed in this condition at about -100 C. by direct supply of steam thereto for 2 hours. After such bleach the samples were rinsed with water. A good bleaching effect was achieved and they were completely free from seedlshells.
• catalytic injury can be prevented during the bleach wher 'eas the bleached sample which had been desized without the addition of hydrazine hydrate exhibited strong rust formation at the spots to which the iron dust had adhered and also exhibited catalytic injury to the fibers which in some instances led to the formation of holes.
• a process for bleaching textile fabrics with aqueous peroxidic bleaching liquors which fabrics have ferrous metal particles therein likely to cause catalytic injury to such fabrics during the bleaching with the aqueous peroxidic bleaching liquor the step of treating said fabrics with at least one hydrazine compound selected from the group consisting of hydrazine hydrate and hydrazine salts in an aqueous medium at a point not later than said bleaching process with the aqueous peroxidic bleaching liquor, the amount of said hydrazine compound employed in said treatment being sufiicient to prevent any catalytic injury to the fabrics caused by said presence of ferrous metal particles.

Landscapes

• Engineering & Computer Science (AREA)
• Textile Engineering (AREA)
• Detergent Compositions (AREA)
• Treatments For Attaching Organic Compounds To Fibrous Goods (AREA)

Applications Claiming Priority (1)

Publications (1)

Family

ID=7045702

Family Applications (1)

Country Status (3)

Cited By (2)

Families Citing this family (1)

Citations (2)

• 1963
  • 1963-02-07 DE DE19631444008 patent/DE1444008A1/de active Pending
• 1964
  • 1964-02-06 US US343141A patent/US3348903A/en not_active Expired - Lifetime
  • 1964-02-07 FR FR963082A patent/FR1381946A/fr not_active Expired

Patent Citations (2)

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