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

Definitions

• Peroxydisulfates have long been known as oxidizing agents for the desizing of textiles sized with starch. From AT-A-281 743 it is known to carry out such desizing processes with alkali or ammonium peroxydisulfate solutions at pH values of approximately 10.
• DE-A-2 913 177 discloses an oxidative desizing agent which consists of 10 to 80% by weight of a surfactant and 20 to 90% by weight of potassium peroxydisulfate.
• DE-B-2814354 discloses an oxidative desizing process in which peroxydisulfate is used as a desizing agent together with water-soluble polymers of acrylic acid.
• Solid products such as peroxydisulfate or semi-solid (pasty) products according to DE-A-2 913177 are not particularly popular with customers because of the difficult metering technology, and so the object of the present invention was to put the peroxydisulfate into a storage-stable, if possible to transfer a viscous and easily dosed form, which, like the previously proposed fixed specifications, guarantees perfect or, if possible, even better oxidative desizing.
• the peroxydisulfate in this suspension does not decompose, despite the presence of water, if this water contains additional potassium ions.
• These potassium ions apparently act on the solubility product, which applies to potassium peroxydisulfate, in such a way that the peroxydisulfate becomes practically insoluble under the conditions of storage in water, and is therefore in finely dispersed form and is not attacked by the water. Only under the conditions of desizing, under which the peroxydisulfate is present in a large dilution, does it dissolve and can become active in the intended sense.
• the suspensions according to the invention necessarily contain potassium peroxydisulfate, polymers or copolymers of acrylic acid and / or maleic acid and the water containing additional potassium ions.
• the potassium peroxydisulfate is preferably present in the suspension in an amount of 15 to 40, especially 20 to 30% by weight, based on the suspension.
• the polymers or copolymers of acrylic acid or maleic acid are understood to be those which are water-soluble, namely polyacrylic acid and polymaleic acid itself, then as copolymers preferably those which contain up to 50% by weight of copolymerizable monoethylenically unsaturated compounds copolymerized with acrylic acid or maleic anhydride, e.g. . B. methacrylic acid, acrylic acid, methacrylic acid Ci to -C 4 alkyl esters, copolymers of maleic acid with methyl vinyl ether, vinyl acetate, styrene, acrylic acid or methacrylic acid. Further copolymers are mentioned in the aforementioned DE-B-2 814 354, to which reference is expressly made here. However, polyacrylic acid and polymaleic acid are of particular technical interest.
• All polymers should have Fikentscher K values of 8 to 30, preferably 10 to 20. They are preferably used in amounts of 2 to 35, especially 9 to 30% by weight.
• the additional K ⁇ ions preferably originate from compounds which provide potassium ions and are capable of helping to set the required pH of at least 5, ie primarily KOH, potash or K 2 0. In addition, others such as K 2 S0 4 , potassium phosphate or KCI can be used.
• the potassium compounds are contained in the aqueous phase at 12 to 65% by weight. This essentially corresponds to at least the saturation concentration, ie the exact percentages depend on the potassium compound used within the limits specified above.
• This system already represents a storage-stable and easy-to-dose liquid suspension that can be used successfully in desizing fleets.
• Suspensions which can be metered even better and can even be pumped are obtained if, based on the newly formed suspension, preferably up to 75% by weight, especially 25 to 45% by weight, of anionic surfactants according to the definition are added to the above-mentioned suspensions.
• anionic surfactants are primarily acidic phosphoric or sulfuric acid esters of Ca to C 2 o-alkanols or their ethoxylates with 1 to 7 ethylene oxide units.
• C io - to C 2o alkane sulfonates, and alkylbenzene sulfonates, and sulfated alkyl phenol ethoxylates can be used as anionic surfactants.
• nonionic surfactants can also be present (preferably up to 40% by weight), and C 8 to C 20 alkanol ethoxylates with 1 to 10 ethylene oxide groups are particularly mentioned here.
• the suspensions built up in this way are very useful as oxidative desizing agents for textile materials sized with starch. They are generally added to the desizing liquors in amounts of 4 to 20, preferably 6 to 13 g / 1 desizing liquor. Depending on the amount of surfactant in the persulfate suspensions, the desizing liquors also contain additional wetting agents and detergents. If the proportion of surfactant in the suspensions is relatively high, the additional wetting agents and detergents can be dispensed with.
• the mixtures were stored at 50 ° C or 80 ° C to check their stability.
• the respective persulfate content was determined titrimetrically. 1 g of the mixture was dissolved in 50 ml of H 2 O / isopropanol (40:10) and 50 ml of KJ solution (concentration: 300 g / l) were added. After fifteen minutes at room temperature, titration was carried out with 0.1 N sodium thiosulfate solution until it turned colorless.
• the K 2 S 2 0s content was monitored at a storage temperature of 50 ° C.
• the comparative sample showed a sufficient desizing effect (Tegewa value 8) only immediately after production at an amount of 10 g / l in the desizing liquor under otherwise the same conditions as in Example 1. After seven days of storage, only a Tegewa value of 4 was achieved during desizing.
• the mixture was used for oxidative desizing.
• Example 3 The mixtures from Example 3 and Example 4 gave Tegewa values of 8 to 9 when 6 g / l were added to the desizing liquor in the case of Bw nettle and Bw twill fabrics. A liquor absorption of 100% and a liquor temperature of 100 to 130 were obtained ° C and a dwell time of 10 minutes.

Landscapes

• Engineering & Computer Science (AREA)
• Textile Engineering (AREA)
• Detergent Compositions (AREA)
• Compositions Of Macromolecular Compounds (AREA)
• Emulsifying, Dispersing, Foam-Producing Or Wetting Agents (AREA)
• Treatments For Attaching Organic Compounds To Fibrous Goods (AREA)
• Polysaccharides And Polysaccharide Derivatives (AREA)

Priority Applications (1)

Applications Claiming Priority (2)

Publications (2)

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ID=6154148

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• 1982
  • 1982-01-28 DE DE19823202760 patent/DE3202760A1/de not_active Withdrawn
  • 1982-12-23 EP EP82111950A patent/EP0086898B1/de not_active Expired
  • 1982-12-23 AT AT82111950T patent/ATE15916T1/de not_active IP Right Cessation
  • 1982-12-23 DE DE8282111950T patent/DE3266715D1/de not_active Expired
  • 1982-12-23 US US06/452,491 patent/US4507220A/en not_active Expired - Fee Related
• 1983
  • 1983-01-21 JP JP58007475A patent/JPS58135109A/ja active Granted
  • 1983-01-24 CA CA000420063A patent/CA1209756A/en not_active Expired

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