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
  • D06L1/12—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
• • 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
  • D06L4/13—Bleaching fibres, filaments, threads, yarns, fabrics, feathers or made-up fibrous goods; Bleaching leather or furs using agents which develop oxygen using inorganic agents
• • 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
  • D06L4/15—Bleaching fibres, filaments, threads, yarns, fabrics, feathers or made-up fibrous goods; Bleaching leather or furs using agents which develop oxygen using organic agents

Definitions

• organic fiber both natural and artificial, can be bleached in the bleaching-bath by means of such decolorants.
• the natural products it is particularlythe animal, 1. e. nitrogenous materials, and the vegetable materials, mostly free from nitrogen, that can be ameliorated by means 01 such bleachingbaths. If the decolorants are used in a highly eilicacious, i. e.
• the material to be bleached is provided, at the spots which are to be bleached, with combinations that are able to start and accelerate the bleaching process, either by depriving the originally stable bleaching solution of its stabilizing substance or by reacting upon the effect of its stabilizing substance. According to the present invention this reaction takes place in the very proximity of the spots to be bleached.
• a deterioration of the bleaching solutions by soiling the perhaps llxiviated actuating substance can be avoided by using the bleaching-baths only for the impregnation of the material in question, or by squirting or brushing the decolorant on the material to be bleached and finishing the bleaching process by leaving the material in a moist state, where it is suitable to work at a raised temperature.
• actuating substances that do not tend to pass into the stabilized bleaching-bath. As the decolorant is worn out only at the spots that are really bleached, the decolorant is used up very economically.
• colloid substances such as glue, colloid silicic acid, solutions of glucosides, tin-salts, organic combinations such as mannite, phenols, particularly those inorganic or organic combinations which give the solution a low value of pH.
• actuating substances we practicably use the well known metallic salts, efflcacious as catalyzers, or enzymes and ferments, for example extracts of yeast, as well as oxidases and peroxidases and finally those combinations which give solutions of a high value of pH.
• a decolorant solution stabilized by an acid it is very practicable to charge the --material with those substances which are able to increase the value of pH, for example with alkalies, alkalic carbonates, salts such as soda having an alkaline reaction, etc. If the latter are applied, it is possible to use the actuating material during the preparatory treatment of the material to be bleached and to leave it partly in the same. Enzymes are found in most of the raw materials, so that it is possible to keep part of the enzymes or all of them in the material to be bleached, by means of a suitable choice of the preparatory treatment.
• Example 1 Cotton is, as usual, washed in an alkaline bath 7 in the presence of 0.3 per cent. of hydrosulphite of sodium formaldehyde. After a short rinsing the material, which still reacts in alkaline fashion, is put into a bleaching-bath of 5 parts by weight of hydrogen peroxide a litre, stabilized by an addition of 0.03 per cent. of phosphoric acid. It is suitable to bleach the material between 20 and 60 and to leave it in the bath for about 5 minutes. Then the material is squeezed off and kept at a temperature of until the bleaching process is finished.
• phosphoric acid there may also be used sulphuric acid. In this case it is suitable to add to the bleaching-bath some sodium-sulphate (about 0.2 per cent). Oxalic acid, too, may be used as stabilizing substance, as well as isobutylnaphthalene-sulpho-acid or boric acid. If instead of hydrogen peroxide perborate of sodium is used for the bleaching-bath. the quantity of the acid must be a little larger. The bleaching process, however, lasts only inconsiderably longer.
• Example 2 100 parts by weight of jute are preparatorily bleached with 800 parts by volume of bleaching solution obtained from 1 part by weight of chloride of lime by converting with sodasolution (containing 0.6 part by weight of calcined soda) for 12-16 hours at the temperature of the room. Then the material is rinsed, as usual, some thicsulphate being added in the beginning, and edulcorated, if necessary, with a 5 per cent. oxalic acid solution. A distinct alkalic reaction of the material upon litmus-paper can still be observed. The bleaching process is now finished in a bleaching-bath containing 0.5-1 per cent. of hydrogen peroxide, stabilized by l per cent. of sulphuric acid, an insignificant quantity of aluminium sulphate being added, if necessary. The material remains in the bath for about 10 minutes at the temperature of the room and is then kept in a moist state for 3-4 hours at a slightly raised temperature.
• sulphuric acid there can be used phosphoric acid, isobutyl-naphthalene-sulphoacid, oleyl-methyl-amino-ethane-sulpho-acid and acids of that kind or the salts thereof. Instead salt.
• a third bleaching-bath can be applied.
• a bath of 0.1 per cent. of hyposulphite of sodium, 0.1 per cent. of calcined soda and 0.1 per cent. of oleine soap proved prof-
• the bleaching process lasts about 20 minutes at a temperature of about Example 3 Jute is freed from dust and then put, for several hours, into a bath containing 0.5 per cent. of purchasable hydrogen peroxide.
• the enzymes which are in the raw jute eifect that the usually rather inactive decolorant solution produces a yellowish white material. Now the material is impregnated in a bath of 2-3 per cent.
• the first bath must not be stabilized, as solutions of such a low percentage are already stable.
• the second bath can also be stabilized by other combinations of a low value of pH or by colloids, such as silicic acid gelatine or by phenols, amines, etc.
• Example 4 parts by weight of animal hair for example hair of the Angora-goat or sheeps wool, are, as, usual, washed with soap and soda and well rinsed.
• the animal hair retains about 1 per cent; of soap.
• the material is put, for two minutes, into a bath of 0.5 per cent. of hydrogen peroxide and 0.03. per cent. of oxalic acid at a temperature of 40, some oxalate being added if necessary.
• the material is flied or squeezed off and dried for a longer time at a lower temperature, or for a shorter time at a higher temperature, for example by making the material pass over warm cylinders. It is worth remarking that the animal material is injured only quite insignificantly, and'particularly that the loss of weight is quite unimportant.
• Example 5 100 parts by weight of bat stumps corroded, as usual, by mercury salts, are put into 600 parts of a bleaching-bath of 3 per cent. of hydrogen peroxide and 1 per cent. of bitter salt (epsomite) and then kept in a moist state.
• the bleachingbath is stabilized by 0.1-0.2 per cent. of lactic acid or phosphoric acid or by 0.1 per cent. of mannite.
• the bleaching process lasts about 3 hours at a temperature of 40-50", about 24 hours at the normal temperature in the room.
• Example 6 100 parts by weight of wool in the form of a cord are put, for 30 minutes at the normal temperature in the room, into 600 parts of a bath of 0.1 per cent. of permanganate of potassium very weakly acidulated by sulphuric acid or to which about 1 per cent. of bitter salt was added. Now the wool is dyed brown by hydrate of dioxide of manganese. Then the material is carefully rinsed and put into a bath containing 0.2-0.5 per cent. of hydrogen peroxide and 0.2 per cent. of sulphuric acid and 0.5-1 per cent. of oxalate of sodium, for about 2 minutes at a temperature of 30-40". Hereafter the material is put into a similar bath containing 2 per cent.
• a particular softness of the material is produced by an addition of protective colloids, for example a small quantity of glue or a small quantity of tanning substance given to the bleachingbath.
• protective colloids for example a small quantity of glue or a small quantity of tanning substance given to the bleachingbath.
• the damage done to the material which is to be bleached is considerably reduced by a preparatory treatment of the material with aldehydes, for example formaldehydes, acetaldehydes, chloraldehydes, etc., or by an addition of the aforesaid combinations to the bath.
• the present bleaching process is not limited to the bleaching of fibrils.
• this process there can as well be bleached other organic materials,'such as horn, bone, resin, artificial resin, legumes, Indian corn, flour, etc.
• the decolorant can also be applied by injection or in a similar fashion.
• a stabilized bleaching bath is taken; the material is impregnated by that,.whereby it is useful to provide said material with compounds actuating the bleaching process.
• the material is impregnated by a bleaching bath stabilized as usual and than said material is given in a watery solution which contains a compound actuating the bleach.
• stabilized hydrogen peroxide bleaching solutions I presume such solution to be substantially non-alkaline, i. e., that it does not give an alkaline reaction with litmus, because otherwise the solution cannot be stable.

Landscapes

• Engineering & Computer Science (AREA)
• Textile Engineering (AREA)
• Chemical & Material Sciences (AREA)
• Inorganic Chemistry (AREA)
• Detergent Compositions (AREA)
• Cosmetics (AREA)
• Chemical Or Physical Treatment Of Fibers (AREA)
• Treatment And Processing Of Natural Fur Or Leather (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=25943717

Family Applications (2)

Family Applications After (1)

Country Status (5)

Cited By (9)

Families Citing this family (16)

• 0
  • BE BE407008D patent/BE407008A/xx unknown
• 1933
  • 1933-12-29 DE DET43413D patent/DE684047C/de not_active Expired
• 1934
  • 1934-02-09 US US710527A patent/US2077103A/en not_active Expired - Lifetime
  • 1934-02-23 US US712608A patent/US2081327A/en not_active Expired - Lifetime
  • 1934-05-07 GB GB13734/34A patent/GB439802A/en not_active Expired
  • 1934-12-22 FR FR784828D patent/FR784828A/fr not_active Expired
  • 1934-12-27 GB GB37084/34A patent/GB451026A/en not_active Expired

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