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
  • D01F6/88—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from mixtures of polycondensation products as major constituent with other polymers or low-molecular-weight compounds
  • D01F6/90—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from mixtures of polycondensation products as major constituent with other polymers or low-molecular-weight compounds of polyamides
• • 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
  • D01F6/88—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from mixtures of polycondensation products as major constituent with other polymers or low-molecular-weight compounds
  • D01F6/94—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from mixtures of polycondensation products as major constituent with other polymers or low-molecular-weight compounds of other polycondensation products

Definitions

• Threads made of polyamides such as polyamide-6 or polyamind-6,6 are industrially manufactured on a large scale and are characterized by high tear strength, bending strength, abrasion resistance, high elasticity and sufficient chemical resistance.
• the disadvantage is their high water absorption and the associated influence on the mechanical properties such.
• B. the modulus of elasticity and associated reduced rigidity due to absorbed water.
• the light and heat stability of these threads is low, which can only be improved over a limited time by adding stabilizers.
• the spinning of polyamide-6,6 in particular requires special measures because of the low thermal stability of the melt, e.g. Steam spinning.
• the previously known measures e.g. The addition of stabilizers to remedy these disadvantages has so far been unsatisfactory.
• the new threads are characterized by improved heat and light stability and low water absorption, while maintaining the mechanical properties.
• the new threads can be spun from the melt without fear of thermal degradation of the melt.
• the threads according to the invention contain 99 to 1% by weight, in particular 50 to 20% by weight, of a linear polyamide e.g. with a relative viscosity of 2.2 to 4.5 measured as a 1% by weight solution in 96% by weight sulfuric acid at 23 ° C.
• a linear polyamide e.g. with a relative viscosity of 2.2 to 4.5 measured as a 1% by weight solution in 96% by weight sulfuric acid at 23 ° C.
• Polyamides derived from lactams with 7 to 13 ring members such as polycaprolactam, polycaprylactam or polylaurine lactam, and polyamides obtained by reacting dicarboxylic acids with diamines, are preferred.
• Suitable dicarboxylic acids which can also be used in any combination, are, for example, alkanedicarboxylic acids having 6 to 12 carbon atoms, in particular 6 to 10 carbon atoms, terephthalic acid, isophthalic acid.
• Suitable diamines which can also be used in any combination, are, for example, alkanediamines having 4 to 12 carbon atoms, in particular 4 to 8 carbon atoms, and also m-xylylenediamine, bis- (4-aminophenyl) methane. It is also possible to use mixtures of the polyamides mentioned. Polyamide-6, polyamide-6,6 and polyamides, which are composed of hexamethylenediamine and isophthalic acid and terephthalic acid, have acquired particular technical importance.
• the threads according to the invention contain 1 to 99% by weight, in particular 80 to 50% by weight, of a reaction product which can be obtained by mixing in the melt, e.g. at a temperature of 250 to 300 ° C, from 99.9 to 35 wt.%, In particular 50 to 80 wt.% of a linear thermoplastic polyamide (component b1) and 0.1 to 65 wt.%, in particular 50 to 20 wt % of a modified polyphenylene ether (component b2).
• a reaction product which can be obtained by mixing in the melt, e.g. at a temperature of 250 to 300 ° C, from 99.9 to 35 wt.%
• a linear thermoplastic polyamide component b1
• 0.1 to 65 wt.% in particular 50 to 20 wt % of a modified polyphenylene ether (component b2).
• modified polyphenylene esters used as component b2 according to the invention are produced from the following components by mixing in the melt at a temperature of 250 to 350 ° C:
• component b 2.1 99.0 to 70% by weight, in particular 90 to 99% by weight, of a polyphenylene ether, it being possible for up to 50% by weight of the polyphenylene ether to be replaced by vinylaromatic polymers.
• the polyphenylene ethers are compounds based on the 2 and / or 6-position to the oxygen-substituted, in particular disubstituted, polyphenylene oxides, the ether oxygen of one unit being bonded to the benzene nucleus of the adjacent unit. At least 50 units are advantageously linked to one another.
• Suitable polyphenylene ethers preferably have alkyl radicals with 1-4 carbon atoms, in particular methyl radicals, in the 2.6 position to the oxygen.
• Examples include poly (2,6-dimethyl-1,4-phenylene) oxide, poly (2,6-diethyl-1,4-phenylene) oxide, poly (2-methyl-6-ethyl-1,4-polyphenylene ) oxide, poly (2-methyl-6-propyl-1,4-phenylene) oxide, poly (2,6-dipropyl-1,4-phenylene) oxide or poly (2-ethyl-6-propyl-1,4 -phenylene) oxide.
• the polyphenylene ethers used advantageously have an intrinsic viscosity of 0.4-0.7 dl / g (measured in chloroform at 30 ° C.). Polyphenylene ethers which are miscible with styrene are particularly preferred.
• Suitable vinyl aromatic polymers are, for example, polystyrene, polyalphamethylstyrene or polyvinyltoluene, in particular polystyrene.
• Component b 2.2 uses 0.1 to 30% by weight, in particular 1 to 10% by weight, of at least one ⁇ , ⁇ -unsaturated aliphatic dicarboxylic acid, its alkyl ester, its half-ester, half-amide or imide and / or a (meth) acrylamide .
• Particularly suitable are fumaric acid C1 to C4 alkyl esters or the corresponding half-ester, fumaric acid half-imide, maleimide or (meth) acrylamide.
• Fumaric acid, C1 to C4 alkyl esters or the corresponding half ester are particularly preferred.
• Beta.-unsaturated aliphatic carboxylic acid or its esters or vinylaromatic monomers can also be used as further component b 2.3 .
• Particularly preferred are acrylic acid, the C1 to C4 alkyl esters of styrene, alphamethylstryrene or vinyl toluene.
• the threads according to the invention optionally contain conventional additives in effective amounts.
• Fillers, matting agents, dye pigments, stabilizers against degradation by the action of heat, atmospheric oxygen and light may be mentioned as additives.
• the threads according to the invention are advantageously produced as follows.
• Component b2 is produced by mixing and reacting components b 2.1 , b 2.2 and optionally b 2.3 in the melt at a temperature of 250 to 350 ° C., poured into strands and granulated.
• the granules obtained in this way are then reacted in the melt, for example at a temperature of 250 to 350 ° C., with the polyamide component b 1, poured into strands and granulated.
• the granules (B) thus obtained are then mixed with component A in the melt, for example at a temperature of 250-350 ° C., and threads are spun from the melt, for example with a diameter of 100 to 10 ⁇ m.
• the threads are advantageously used at elevated temperatures e.g. Stretched 50 to 150 ° C e.g. 1.5 to 10 times, especially 2 to 5 times.
• the threads according to the invention are suitable for the production of technical or textile fabrics such as woven fabrics, knitted fabrics of all kinds, non-woven nonwovens.
• the average residence time in the extruder was 2.5 minutes.
• the melt was poured into strands, cooled, granulated and dried. 40 parts by weight of the granules obtained in this way were reacted with 66 parts by weight of polyamide-6 with a molecular weight M g of 36,000 in a twin-screw extruder at 280 ° C., the residence time in the extruder being 2 minutes.
• the melt was poured into strands, cooled, granulated and the granules dried.
• component B 50 parts of the reaction product thus obtained (component B) were mixed with 50 parts by weight of polyamide-6 with a relative solution viscosity of 2.63, (measured in a solution of 1 g of polymer in 100 ml of 96% by weight sulfuric acid at 25 ° C. ) mixed at a temperature of 275 ° C in the melt, granulated and dried. The dried granules were then spun in a manner known per se on an extruder melt spinning device at a temperature of 290 ° C. and a take-off speed of 800 m / min. The threads obtained were coldly hidden 2.6 times in a manner known per se.
• the hidden threads had the following properties: Titer: 111/20 dtex Tear resistance: 3.6 cN / dtex Elongation at break: 56.5% E-module: 36000 cN / mm2 Water absorption: 1.0% in the standard climate Heat stability: 34% of the initial strength after heating in air at 190 ° C for three hours Light stability: 40% tear strength, based on the initial strength in the Xenotest 450 after 28 days
• Example 1 was repeated with the difference that only polyamide-6 (component A) was spun into threads.
• the threads spun at 290 ° C and coldly stretched 3.5 times had the following properties: Titer: 75/20 dtex Tear resistance: 3.5 cN / dtex Elongation at break: 26% E-module: 29000 cN / mm2 Water absorption: 1.7% in the standard climate Heat stability: 23% measured as in Example 1
• Light stability 20% tear resistance, based on the initial strength of the Xenotest 450 after 28 days
• Example 2 The polyamide-6,6 used in Example 2 was spun into threads and drawn at a temperature of 290 ° C. as in Example 2 without further additives.
• the threads had the following properties: Titer: 94/1 dtex Tear resistance: 3.0 cN / dtex Elongation at break: 30% E-module: 23 cN / dtex

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Citations (5)

• 1988
  • 1988-05-31 DE DE19883818424 patent/DE3818424A1/de not_active Withdrawn
• 1989
  • 1989-05-24 JP JP12903389A patent/JPH02104724A/ja active Pending
  • 1989-05-24 EP EP19890109325 patent/EP0344590A3/fr not_active Withdrawn

Patent Citations (5)

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