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
  • D06L4/20—Bleaching fibres, filaments, threads, yarns, fabrics, feathers or made-up fibrous goods; Bleaching leather or furs using agents which contain halogen
  • D06L4/27—Bleaching fibres, filaments, threads, yarns, fabrics, feathers or made-up fibrous goods; Bleaching leather or furs using agents which contain halogen using organic 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
• • 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
  • D06L4/70—Multi-step processes

Definitions

• the preliminary treatment and the second treatment may be conducted either in continuous operation like the first and third treatments, or semicontinuously, by winding.
• the object of the present invention is to provide an industrial rapid bleaching process carried on continuously or semi-continuously, by impregnating in the presence of aqueous solutions containing chlorinated derivatives of cyanuric acid, optionally comprising a preliminary treatment in the presence of these same products combined with alkaline treatments of high concentration in an atmosphere of water vapor and with oxidizing in the presence of hydrogen peroxide,
• the Liberian products treated in accordance with the process deteriorate very little and display a good whiteness, the technical progress 3,552,907 Patented Jan. 5, 1971 of the invention moreover consisting in the considerably reduced durations of treatment, of some 4060 minutes to fours hours in the case of very heavy fabrics, rich in ligneous materials.
• the textile product of linen, hemp or jute passes loosely at high speed into a washing machine, where it is brought in contact with boiling water containing, if necessary, detergents or Wetting agents. After being wrung out it is impregnated with a solution of caustic soda of 40-60 g./l., possibly in the presence of detergents and wetting agents, then -100% wrung out. It is then admitted into a vaporizer in a steam atmosphere at C., then disposed in the form of folds in a ripening apparatus where it stays for 10 to 20 minutes at 100 C.
• the textile product undergoes washing, and intense rinsing on a washing machine comprising several baths so as to remove the soda and the impurities rendered soluble in the course of ripening, then, without interrupting continuous operation, it passes into a saturation bath containing a solution of chlorinated derivatives of cyanuric acid at 7-15 g./l. of available chlorine, having a pH of between 4 and 5.
• a saturation bath containing a solution of chlorinated derivatives of cyanuric acid at 7-15 g./l. of available chlorine, having a pH of between 4 and 5.
• These solutions are generally made up of a mixture of trichlorocyanuric acid, cyanuric acid, and alkali metal carbonate or bicarbonate, or again, of alkali metal salts of dichlorocyanuric acid in which case it is advisable to add to the bath 4 to 6 g./l.
• the textile product wrung out at 100-110% is deposited in the form of folds in a second ripening apparatus in which it remains for 10 to 20 minutes at a temperature chosen between atmospheric and 50 C. before passing into a washing machine with two baths containing boiling water, where it is freed of excess available chlorine and dissolved impurities, then wrung out at 90100%.
• Such treatment consists in impregnating the textile product in a solution of chlorinated derivatives of cyanuric acid titrating 7 to 15 g./ 1. of available chlorine the pH of which is reduced to between 4 and 5.
• the fabric is then deposited in the form of folds in a ripening apparatus, or preferably, wound on a drum made to rotate slowly for l to 3 hours before being washed hot, rinsed, wrung out and subjected to the first treatment.
• EXAMPLE 1 An untreated linen textile fabric is subjected to continuous bleaching according to the present invention at a speed of 70 meters per minute. This fabric has the following characteristics:
• Trichlorocyanuric acid (ATCC)11.l g./ liter of bath Cyanuric acid (AC)3.0 g./liter of bath 8odium bicarbonate (BS)-6.1 g./liter of bath Acetic acid necessary to maintain the pH at 4.5
• This solution in which the molecular ratio ATCC/AC/ BS is substantially 2/ 1/3 has a concentration of available chlorine of 10 g./l.
• the fabric On leaving the saturator, the fabric is wrung out to about 100%, and is then subjected to ripening in a second J-Box at 50 C. for 15 minutes before being washed in boiling water, rinsed and forcibly wrung out.
• the fabric After drying, the fabric displays a degree of whiteness of 90.3%, the degree of percent of transmission being effected by means of a photo-colorimeter, related to a standard of whiteness of MgCO
• the degree of polymerization of the cellular fiber exceeds 1950.
• ATCC Trichlorocyanuric acid
• AC Cyanuric acid
• CS bath Sodium carbonate
• Acetic acidquantity necessary for maintaining a pH The molecular ratio ATCC/AC/ CS is: 2/ 1/ 1.5
• EXAMPLE 2 A jute fabric is subjected to bleaching by the mixed semi-continnous/continuous processes of the invention, comprising a preliminary chlorocyanuric treatment.
• the unbleached fabric is impregnated by passing through a bath having the same constant molecular ratio ATCC/AC/BS as that of the second treatment of Example 1, the pH being maintained at 4.8 by adding phosphoric acid.
• the available chlorine content in the solution is 15 g./l., and its composition, kept constant, is the following:
• Trichlorocyanuric acid (ATCC)16.7 g./l. of the bath Cyanuric acid (AC)4.5 g./l. of the bath Sodium bicarbonate (BS)9.2 g./l. of the bath Phosphoric acidquantity necessary for maintaining a pH of 4.8
• the impregnated product is wrung out to then wound onto a mandrel maintained slowly in rotation for three hours at 20 C.
• the impregnation is effected in a bath of identical composition to that of the preliminary treatment bath, the ripening in a J-Box being then effected at 20 C. for 20 minutes.
• the total time taken for bleaching is under 4 hours.
• EXAMPLE 3 The-untreated linen fabric of Example 1 is subjected to continuous/semi-continuous bleaching, according to one of the variations of the process of this invention.
• the forcibly wrung out fabric is impregnated by passing it through a bath with an available chlorine content of about 7 g./l;, and of which the composition, kept constant, is as follows:
• Trichlorocyanuric acid (ATCC)--8.3 g./l. of the bath Cyanuric Acid (AC)2.2 g./l. of the bath Sodium bicarbonate (BS)4.5 g./l. of the bath Phosphoric acid--quantity necessary for maintaining a pH of 5 Molar ratio ATCC/AC/BS-substantially 2/ 1/3
• the impregnated fabric is wrung out at 100-110% then wound onto a drum kept slowly rotating for 3 hours at 20 C.
• the total time for bleaching is about 3 hours and 35 minutes.
• the resultant product of an average degree of polymerization of 2040, presents an average degree of whiteness of 89.5%, the percentage of transmission being effected in relation to a standard whiteness of MgCO by means of a photo-colorimeter.
• the bleaching process comprises three essential stages in the course of which the unbleached product after washing is brought successively in contact with a strongly alkaline bath under "a steam atmosphere at 100 C., a bath formed of an aqueous solution of chlorinated derivatives of cyanuric acid with an available chlorine content of between 7 and g./l., the pH of which is maintained at a value between 4 and 5 at temperatures of to 50 C., and an alkaline bath of hydrogen peroxide at 70100 C.
• the chlorinated derivatives of cyanuric acid constituting the bath of the second treatment, as well as that of the preliminary treatment if necessary, described under (1), are selected amongst trichloro-cyanuric acid mixed with cyanuric acid and alkali metal bicarbonate or carbonate in the molecular ratio 2/ 1/ 3 or 2/ 1/ 1.5 or amongst the alkali metal salts of dichlorocyanuric acid, the pH of the bath being maintained at a value of between 4 and 5 by the addition of a mineral or organic acid.
• the operation of bleaching described under (1) and (2) comprises three continuous treatments lasting altogether 40 to 60 minutes, the second being conducted at (4)
• the operation of bleaching described under (1) and (2) comprises three treatments of which the first and third are conducted continuously and the second semicontinuously, in the course of which the textileproduct of the first treatment, after washing, wringing out, is impregnated in a bath constituted by an aqueous solution of chlorinated derivatives of cyanuric acid, then, after being wrung out at is wound at a temperature of between 20 and 50 -C. for 1 to 3 hours, before being unwound andsubjected to the third continuous treatment, the operation lasting altogether from -1 hour 30 minutes to 3.hours 45 minutes.
• An industrial process for bleaching textile products having a base of Liberian fibers selected from the group consisting of linen, hemp and jute comprising a first stage in which the unbleached product is washed and then impregnated with a sodium hydroxide solution and steamed at approximately 100 C.; a second stage wherein the product is then brought into contact with an aqueous solution consisting essentially of a bleaching ingredient selected from the group consisting of at least one of trichlorocyanuric acid, dichlorocyanuric acid and their alkali metal salts, said solution having an available chlorine content of between 7 and 15 g./l., the pH of which is maintained between 4 and 5 at temperatures of 2050 C.; and a third stage wherein the product is then brought into contact with an alkaline aqueous solution having a pH higher than 7 of hydrogen peroxide at 70100 C. stabilized with sodium silicate, the product being washed and wrung out between each stage.
• bath composition of the second stage is selected from the group consisting of mixtures of trichlorocyanuric acid, cyanuric acid and sodium carbonate or bicarbonate in a molecular ratio of 2:1:1.53; and alkali metal salts of dichlorocyanuric acid, the pH of the bath being maintained between 4-5.
• a process according to claim 2 wherein the preliminary treatment before the first stage is semi-continu- 7.

Landscapes

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

Applications Claiming Priority (1)

Publications (1)

Family

ID=8616600

Family Applications (1)

Country Status (5)

• 1966
  • 1966-09-06 FR FR75421A patent/FR1501809A/fr not_active Expired
• 1967
  • 1967-09-05 BE BE703492D patent/BE703492A/xx unknown
  • 1967-09-05 US US665275A patent/US3552907A/en not_active Expired - Lifetime
  • 1967-09-05 GB GB40604/67A patent/GB1181850A/en not_active Expired
  • 1967-09-06 NL NL6712198A patent/NL6712198A/xx unknown

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