Classifications

• • D—TEXTILES; PAPER
  • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
  • D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
  • D06M13/00—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with non-macromolecular organic compounds; Such treatment combined with mechanical treatment
  • D06M13/10—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with non-macromolecular organic compounds; Such treatment combined with mechanical treatment with compounds containing oxygen
  • D06M13/12—Aldehydes; Ketones
• • D—TEXTILES; PAPER
  • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
  • D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
  • D01F4/00—Monocomponent artificial filaments or the like of proteins; Manufacture thereof
• • D—TEXTILES; PAPER
  • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
  • D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
  • D06M11/00—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with inorganic substances or complexes thereof; Such treatment combined with mechanical treatment, e.g. mercerising
  • D06M11/58—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with inorganic substances or complexes thereof; Such treatment combined with mechanical treatment, e.g. mercerising with nitrogen or compounds thereof, e.g. with nitrides
  • D06M11/64—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with inorganic substances or complexes thereof; Such treatment combined with mechanical treatment, e.g. mercerising with nitrogen or compounds thereof, e.g. with nitrides with nitrogen oxides; with oxyacids of nitrogen or their salts

Definitions

• casein fibers either alone or mixed with wool are to be treated in an acid medium or even in a dye bath containing chromic acid, the casein fibers are attacked and the material becomes slimy during the dyeing process and shrinks and sticks together during the subsequent drying operation.
• casein fibers may be rendered resistant even to hot acid dye baths by subjecting the fibers to treatment with nitrous acid in addition to treating them with aldehydes such as formaldehyde.
• the present invention accordingly comprises a process for rendering casein fibers resistant to shrinkage or sticking in hot acid dye baths which consists in subjecting the fibers which have not previously been neutralised with alkaline reagents to treatment with nitrous acid and with an aldehyde or a substance giving rise to an aldehyde.
• the treatment with nitrous acid may be varied in degree so that varying degrees of resistance to hot acid baths may be secured.
• the source of nitrous acid may conveniently consist of an alkaline nitrite such as sodium nitrite and an acid, for example, glacial acetic acid.
• the nitrous acid may be formed in situ by the reaction of acid groups in the casein with the added alkaline nitrite, e. g., sodium nitrite.
• any free carboxyl groups remaining in the casein molecule may if desired be neutralised as previously proposed.
• the nitrite treatment may conveniently be carried out by subjecting the casein fibers to a mixture of a solution of alkaline nitrite and a neutral dehydrating salt such as sodium sulphate or magnesium sulphate.
• a neutral dehydrating salt such as sodium sulphate or magnesium sulphate.
• the fibers After treatment of the fibers with an aldehyde and with nitrous acid they may subsequently be treated with a softening agent such as glycerol,
• Example I Casein fibers produced from. an alkaline casein solution in known manner by means of an acid precipitating bath are thoroughly hardened with a 10% solution of formaldehyde. After washing and drying the fibers are treated at room temperature for two hours with a solution contain- Y ing 8 grins. of sodium nitrite and. 11 grms. of glacial acetic acid per 100 grins. of dried fiber. The fibers are then well washed and dried.
• fibrous material thus treated is dyed for an hour at C. in a dye bath containing 4% of sulphuric acid with a bath ratio of 1 to 40 calculated on the weight of the fibrous'material,
• Example II Casein threads spun from a casein solution in the known manner are treated under tension with a solution. containing 3% of nitrous acid and 8% of sodium sulphate. The excess of nitrous acid is removed by washing with water and the threads are then hardened with formaldehyde in the usual manner.
• casein fibers treated as described above possess good resistance to hot acid wool-dyeing baths which may contain sulphuric acid but they are inferior to ordinary wool when they are subjected to an after-treatment and washing with weakly alkaline agents such as sodium carbonate Under such treatment the casein fibers exhibit excessive swelling and slipperiness.
• casein neutralised beforehand with alkaline agents such as alkaline earths, e. g., calcium hydroxide solution, is not capable of so acting.
• Example IV Casein fibers spun in a manner known per se in an acid'bath and pro-hardened with formaldehyde and dried are introduced into an aftertreatment bath containing 7% of sodium nitrite and if desired 10% of sodium sulphate and are treated therein at room temperature for two hours at a bath ratio of 1 to 30. The material is then thoroughly hydro-extracted, washed and dried.
• the nitrite solution may also be allowed to act on the casein fiber before the first drying and in such a case the formaldehyde treatment may be carried out before or after the nitrite treatment.
• the step which comprises subjecting the fibers to treatment with nitrous acid by preparing a solution of an alkaline nitrite and impregnating the fibers therewith, and effecting liberation of nitrous acid by reacting said nitrite with the acid groups in the fibers.

Landscapes

• Engineering & Computer Science (AREA)
• Textile Engineering (AREA)
• Chemical & Material Sciences (AREA)
• Chemical Kinetics & Catalysis (AREA)
• General Chemical & Material Sciences (AREA)
• Treatments For Attaching Organic Compounds To Fibrous Goods (AREA)
• Coloring (AREA)

Applications Claiming Priority (1)

Publications (1)

Family

ID=6545552

Family Applications (2)

Family Applications Before (1)

Country Status (5)

Cited By (4)

• 0
  • US US22262D patent/USRE22262E/en not_active Expired
  • NL NL46483D patent/NL46483C/xx active
  • BE BE427082D patent/BE427082A/xx unknown
• 1938
  • 1938-03-16 FR FR835313D patent/FR835313A/fr not_active Expired
  • 1938-04-05 GB GB10450/38A patent/GB500013A/en not_active Expired
  • 1938-04-22 US US203700A patent/US2169955A/en not_active Expired - Lifetime

Also Published As

Similar Documents