Classifications

• • 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
  • D01F6/00—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof
  • D01F6/58—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from homopolycondensation products
  • D01F6/70—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from homopolycondensation products from polyurethanes
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T428/00—Stock material or miscellaneous articles
  • Y10T428/29—Coated or structually defined flake, particle, cell, strand, strand portion, rod, filament, macroscopic fiber or mass thereof
  • Y10T428/2913—Rod, strand, filament or fiber
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T428/00—Stock material or miscellaneous articles
  • Y10T428/29—Coated or structually defined flake, particle, cell, strand, strand portion, rod, filament, macroscopic fiber or mass thereof
  • Y10T428/2913—Rod, strand, filament or fiber
  • Y10T428/2929—Bicomponent, conjugate, composite or collateral fibers or filaments [i.e., coextruded sheath-core or side-by-side type]
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T428/00—Stock material or miscellaneous articles
  • Y10T428/29—Coated or structually defined flake, particle, cell, strand, strand portion, rod, filament, macroscopic fiber or mass thereof
  • Y10T428/2913—Rod, strand, filament or fiber
  • Y10T428/2933—Coated or with bond, impregnation or core
  • Y10T428/2964—Artificial fiber or filament
  • Y10T428/2967—Synthetic resin or polymer

Definitions

• the invention relates to a spinning process, in particular a dry spinning process, for the production of elastane fibers, in which the elastane spinning solution prior to spinning contains 0.8 to 2% by weight of polydimethylsiloxane with a viscosity of 50 to 300 mm 2 / s and 0.2 to 0, 6% by weight of ethoxylated polydimethylsiloxane with a viscosity of 20 to 150 mm 2 / s can be added.
• Elastane fibers are understood to mean fibers which consist of at least 85% by weight segmented polyurethanes exist.
• the elastic and mechanical Properties of such fibers are achieved in that for the production of Elastane fibers, for example polyurea polyurethanes from aromatic diisocyanates be used.
• Such elastanes are usually made by Spinning solutions after wet spinning or preferably after Dry spinning process manufactured. Both are suitable as solvents Process polar solvents, e.g. Dimethyl sulfoxide, N-methylpyrrolidone, Dimethylformamide and preferably dimethylacetamide.
• the object of this invention is to provide improved elastane fibers, after processing on warp knitting machines in dyed and finished textiles Produce a significantly lower streakiness without the processability in the to interfere with the intermediate steps required to manufacture the goods.
• this goal can be achieved by adding a mixture of polydimethylsiloxane (PDMS) with a viscosity of 50 to 300 mm 2 / s and ethoxylated polydidimethylsiloxane to this solution before spinning the polyurethane urea solution and then adding the Spinning.
• PDMS polydimethylsiloxane
• Eo ethylene oxide and Z is either hydrogen or a C 1 -C 6 -alkyl radical, x, y and m are integers greater than or equal to 1, which are preferably chosen so that formula (I) has the molecular weight of 4,000 does not exceed.
• Products of this type are manufactured, for example, by Union Carbide under the trade name Silwet®.
• Particularly suitable for the use according to the invention are those types which have a viscosity of 20 and 150 mm 2 / s and a molecular weight of approximately 600 to 4000. Unless expressly stated otherwise, all molecular weight data relate to the number average (M n ).
• PDMS polydimethylsiloxane
• DE-A-3 912 510 in which the production of Elastanes using a special spinning process, namely a dry spinning process for the production of coarse titer elastane fibers with the introduction of superheated Water vapor is described.
• Silicone oils are possible there among others Additives called flow improvers.
• U.S. Patent 4,973,647 mentions also spinning silicone oil. In no document is anything about the Effects of the oil stated after further processing. A special one Spinning combination of oils of certain properties will not work there mentioned.
• the polyurea polyurethanes are produced according to known methods Procedures.
• the synthetic structure of the Fiber raw materials according to the prepolymer process being in the first process stage a long chain diol in the solvent or melt with a diisocyanate is converted to a prepolymer so that the reaction product isocyanate end groups contains.
• Polyester diols and polyether diols are preferred as diols. Mixtures of polyester and polyether diols are also suitable.
• the Diols generally have a molecular weight of 1000 to 6000.
• polyester diols e.g. Dicarboxylic acid polyester suitable, both several contain different alcohols as well as several different carboxylic acids can.
• suitable polyesters preferably a molecular weight of 1000 to 4000.
• Suitable polyether diols are e.g. Polytetramethylene oxide diols, preferably with molecular weights from 1000 to 2000.
• Polyester or / and polyether diols can also be used in combination with diols which contain tertiary amino groups.
• N-alkyl-N, N-bis-hydroxyalkylamines are particularly suitable.
• the customary aromatic diisocyanates are optionally used in a mixture with small amounts of aliphatic diisocyanates. Particularly useful results are obtained with the following diisocyanates: 2,4-tolylene diisocyanate and corresponding isomer mixtures, also 4,4'-diphenylmethane diisocyanate or corresponding isomer mixtures. It is of course possible to use mixtures of aromatic diisocyanates.
• Another embodiment of the synthesis of elastane raw materials according to the invention consists of blending polyester and polyether-polyurethane prepolymers and then convert to polyurea polyurethanes in a known manner. That for the respective technical purpose favorable mixture ratio of polyester and Polyether diols can be easily determined by preliminary tests.
• the desired urea groups are introduced into the macromolecules through a chain extension reaction.
• the macro-diisocyanates synthesized in the prepolymer stage are usually reacted in solution with diamines.
• Suitable diamines are, for example, ethylenediamine, tetramethylene diamine, 1,3-cyclohexanediamine, isophoronediamine and mixtures of these diamines.
• the desired molecular weight can be set by using a small amount of monoamines, for example diethylamine or dibutylamine, during the chain extension.
• the chain extension itself can be carried out using CO 2 as a retardant.
• a mixture of polyester and polyether-polyurethane-ureas can also be used Completion of the elastane synthesis can still be carried out.
• the reactions described are usually in an inert polar Solvents such as dimethylacetamide, dimethylformamide or the like.
• the silicone oils are made in concentrations according to the method of the invention from 0.8 to 2% by weight, relating to the polydimethylsiloxane or 0.2 to 0.6% by weight, regarding the ethoxylated polydimethylsiloxane.
• the weight ratio from PDMS to ethoxylated PDMS in the finished phase is preferably from 1: 1 to 5: 1.
• the concentration data mean the content of oil in the finished spun elastane filament.
• the oils are introduced using a Master batch in which the oils together with other spinning aids, e.g. an anti-adhesive in the solvent, e.g. Dimethylacetamide can be dispersed.
• this master batch is made using a static or other mixer Spinning solution added.
• concentration of both silicone oils together in the Master batches are preferably from 15 to 22% by weight.
• Fibers produced by the process according to the invention have preferably a single titer of 10 to 160 dtex. Are particularly preferred multifilament fibers, consisting of 3 to 5 coalesced single capillaries. You own preferably a titer of approximately 33 to 55 dtex.
• the fibers After leaving the spinning shaft, the fibers can still be used with a conventional External preparation, which the processing in the following Ensures warping and knitting processes.
• the elastane fibers obtainable by the process according to the invention are further Subject of the invention.
• 1340 threads of diter 45 are used on a elastane warping machine (Type DSE 50/30 from Karl Mayer, Oberhausen) with a pre-stretching of 156% and a final stretch of 40% on two part warp beams (TKBs) tightened.
• a elastane warping machine Type DSE 50/30 from Karl Mayer, Oberhausen
• TKBs two part warp beams
• these partial warp beams are used together with two TKBs Polyamide dtex 44/10 from SNIA made an elastic warp knit fabric.
• Warp knitting machine becomes a warp chair type HKS 2 / E 32 (Karl Mayer, Oberhausen) used.
• the thread entry values for the elastane are 59.0 cm and for the polyamide 160.0 cm.
• the warp knitted fabric thus produced is then placed on a steaming table Vibration device relaxes, with differences in the raw material contained in the mesh density and the width of the goods are largely balanced.
• hot air fixation takes place on a stenter frame not prewashed for 40 seconds at 195 ° C and a lead of 8th %.
• the fixing width is 100 cm.
• the fixed goods are cold to perforated in a separate tenter frame passage Color trees wrapped.
• the optical uniformity is assessed by an optical control of the finished colored goods both in transmitted light and in reflected light and will assessed on a scale from 1 to 9.
• This The grading scale is valid for all elastane finenesses. Grades from 1 to 3 can be only achieve with coarser titers (> dtex 80). For the dtex 45 described here the grade 4 is a very even commodity, grade 5 only corresponds to a good one Uniformity, grade 6 of a satisfactory, but still top quality corresponding uniformity.
• the knitwear was made from an elastane polymer, which is made of a polyester diol of molecular weight 2000, which from Adipic acid, hexanediol and neopentyl glycol, with methylene bis (4-phenyl diisocyanate) ("MDI”) and then capped with a mixture of ethylenediamine (EDA) and diethylamine (DEA) chain extended.
• MDI methylene bis (4-phenyl diisocyanate
• the elastane polymer for each of the examples was made essentially after the same procedure.
• polyester diol were of molecular weight 2000 with 1.00 part by weight of 4-methyl-4-azaheptanediol-2.6 and 36.06 parts by weight Dimethylacetamide (DMAC) and 13.06 parts by weight of MDI mixed at 25 ° C Heated 50 ° C and held at that temperature for 110 minutes Isocyanate-capped polymer with an NCO content of 2.65% NCO win.
• DMAC Dimethylacetamide
• Example 1 100 parts of the capped were after cooling Chilled polymers to 25 ° C and to a solution of 1.32 parts by weight EDA, 0.03 parts by weight of DEA quickly mixed in 189.05 parts of DMAC, see above that a spinning solution of the polyurethane-urea in DMAC with a solids content of 22.5%.
• the molecular weight of the polymer was adjusted so that a viscosity of 70 Pa.s / 25 ° C and an inherent viscosity ⁇ inh. of 1.4 dl / g resulted.
• HDI hexamethylene diisocyanate
• the chain extension was carried out as follows: 100 parts of the capped polymer were cooled down to 20 ° C. and then this solution was diluted with 59.85 parts by weight of DMAC. This solution was then intensively mixed in a continuous reactor with a mixture of 1.23 parts by weight of EDA, 0.08 parts by weight of DEA and 60.72 parts by weight of DMAC, so that a spinning solution of polyurethane-urea in DMAC with a solids content of approx. 30% and a viscosity of 50 Pa.s / 50 ° C with an inherent viscosity ⁇ inh. of 1.4 dl / g.
• a second stock batch consisting of 30.94 parts by weight of titanium dioxide type RKB 2 (Bayer AG), 44.52 parts by weight Dimethylacetamide and 24.53 parts by weight of 22% spinning solution, in such a way that in the finished thread a titanium dioxide content of 0.05% by weight, based on the Polyurethane-urea polymers resulted.
• Additive content in the finished fiber 0.3% by weight Magnesium stearate 0.3% by weight Silwet® L 7607 (Union Carbicle; ethoxylated PDMS) 1.0% by weight Baysilonöl® M 100 (Bayer AG) with a viscosity of 100 mm 2 / s
• the spinning solution was spun in a typical spinning apparatus of 5 m length to filaments with a titer of 11 dtex spun dry, 4 individual filaments each to coalesced filament yarns of 44 dtex were combined and wound up at 330 m / min.
• Additive content in the finished fiber 0.3% by weight Magnesium stearate 0.3% by weight Silwet® L 7607 (Union Carbicle) 1.0% by weight Baysilonöl® M 100 (Bayer AG) with a viscosity of 100 mm 2 / s
• the spinning solution was in a spinning apparatus from 10 m length dry spun into filaments with a single titer of 11 dtex, 4 individual filaments each for coalesced filament yarns of 44 dtex were summarized and wound up at 500 m / min.
• Additive content in the finished fiber 0.3% by weight Magnesium stearate 0.3% by weight Silwet® L 7607 1.0% by weight Baysilonöl® M 100 with a viscosity of 300 mm 2 / s
• the spinning solution was also used Spinning nozzles in a spinning apparatus of 10 m in length to filaments with a titer of 11 dtex dry spun, 4 individual filaments each coalescing Filament yarns of 44 dtex were combined, which with 500 m / min were wound up.

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

Applications Claiming Priority (2)

Publications (2)

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Family Applications (1)

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• 1993
  • 1993-09-10 DE DE4330725A patent/DE4330725A1/de not_active Withdrawn
• 1994
  • 1994-08-29 DE DE59407269T patent/DE59407269D1/de not_active Expired - Fee Related
  • 1994-08-29 EP EP94113440A patent/EP0643159B1/de not_active Expired - Lifetime
  • 1994-09-02 US US08/300,669 patent/US6123885A/en not_active Expired - Fee Related
  • 1994-09-07 CA CA002131581A patent/CA2131581C/en not_active Expired - Fee Related
  • 1994-09-08 JP JP23964794A patent/JP3507907B2/ja not_active Expired - Fee Related
• 2000
  • 2000-06-30 US US09/608,866 patent/US6284371B1/en not_active Expired - Fee Related

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