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
  • 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
  • D06M11/07—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 halogens; with halogen acids or salts thereof; with oxides or oxyacids of halogens or salts thereof
  • D06M11/30—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 halogens; with halogen acids or salts thereof; with oxides or oxyacids of halogens or salts thereof with oxides of halogens, oxyacids of halogens or their salts, e.g. with perchlorates

Definitions

• THIS invention relates to the shrinkresist treatment of wool, particularly wool tops.
• 'wool' will be used as also including wools blended with other fibres.
• SAWTRI-process entails the chlorination of wool tops with a solution of the potassium or sodium salt of dichloroisocyanurate (also known as DCCA) in the presence of acetic acid at pH 1,3 to 2,2 in a pad mangle; dechlorination of the product in a solution of sodium bisulphite/sodium bicarbonate; rinsing in water; acidification of the product in dilute acid; applying an acid colloid solution of a suitable methylolmelamine resin containing a polyethylene softening agent to the product; drying the treated wool tops; and curing the resin in a drier.
• DCCA dichloroisocyanurate
• a method for the shrinkresist treatment of wool includes the steps of chlorinating the wool with an acidi fied hypochlorite; dechlorinating the product; acidifying the product; and applying an acid colloid solution of a suitable methylolmelamine resin to the product.
• the dechlorinated product is rinsed before it is acidified.
• rinsing and acidification steps may be combined into a single step.
• the chlorinated product may also be rinsed prior to the dechlorination step.
• the method according to the invention comprises the SAWTRI process wherein the conventional chlorinating agent i.e. DCCA and acetic acid, is replaced by acidified hypochlorite.
• DCCA conventional chlorinating agent
• acetic acid acidified hypochlorite
• the chlorination of the wool is carried out in a manner to give an active chlorine treatment level in excess of 2,0% (m/m) of wool.
• the chlorination of the wool is carried out in a suction drum.
• the method includes the steps of chlorinating wool tops in a suction drum using an aqueous solution of a suitable hypochlorite which has been acidified to a pH of 1,2 to 2,2; dechlorination of the product with sodium bisulphite/ sodium bicarbonate solution; rinsing the product in water; acidifying the product with dilute acetic acid; applying an acid colloid solution of a suitable methylolmelamine resin containing a suitable softening agent to the product; drying the product; and curing the resin at a temperature in the order of between 80° and 120°C.
• the chlorinating agent comprises a solution of sodium hypochlorite which has been acidified with sulphuric acid.
• a level of chlorination i.e. the amount of chlorine exhausted onto the wool
• m/m active chlorine
• the acid colloid may be prepared by well-known processes from commercially available methylolmelamine resins, such as, for example, those normally used for the crease resist treatment of cotton fabrics.
• the softening agents may be commercial products such as, for example, those of the polyethylene type; Crosoft SW; etc. which are compatible with the acid colloid resin and which do not cause precipitation or coagulation of the resin bath.
• the ratio of acid colloid resin to softening agent is preferably in the order of about 2:1.
• the method according to the invention is preferably carried out on a continuous basis employing a suction drum and a series of bowls such as those used in conventional backwashing machines in which case the method entails the following steps:
• suction drums may be employed instead of the aforesaid bowls.
• the rinsing and acidification steps may be combined.
• Sodium hypochlorite and sulphuric acid are then pumped into the bowl of the drum until the active chlorine content of the solution is 0,3 g/l and the pH 1,5.
• Twelve wool tops are then continuously passed through the bowl of the suction drum at a speed of 3 metre/minute and sodium hypochlorite is simultaneously pumped into the drum at a rate which effectively gives 3% active chlorine on the mass of the wool being treated and at the same time sulphuric acid is pumped into the bowl of the drum to maintain the pH of the solution at approximately 1,5.
• the wool is then passed through squeeze rollers to remove the excess liquor, optionally rinsed in water, and then enters the dechlorination bowl where it is immersed in the (0,1 to 3,0% (m/v)) sodium bisulphite/ (0,1 to 3,0% (m/v)) sodium carbonate and/or bicarbonate solution.
• the wool passes through squeeze rollers and into the rinse bowl where it is rinsed, followed by squeezing, after which it enters the acid bowl containing 2% (v/v) acetic acid.
• the wool then passes through a further set of squeeze rollers into the resin bowl containing an aqueous solution of 2,0% (m/v) acid colloid prepared from Cassurit HML (Hoechst Ltd) and 1,0% (m/v) Polythem N-40 (Textile Chemicals Ltd) as softening agent.
• the wool then passes through squeeze rollers whereafter it is dried and the resin cured at 118°C. After conditioning, the tops can be processed further into yarn.

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• Engineering & Computer Science (AREA)
• Textile Engineering (AREA)
• Paper (AREA)
• Treatments For Attaching Organic Compounds To Fibrous Goods (AREA)
• Chemical Or Physical Treatment Of Fibers (AREA)

Applications Claiming Priority (2)

Publications (2)

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Country Status (1)

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• 1982
  • 1982-10-28 EP EP82305728A patent/EP0080272A3/de not_active Withdrawn

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