WO2018181699A1 - Monofilament élastique et articles tricotés tissés - Google Patents

Monofilament élastique et articles tricotés tissés Download PDF

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WO2018181699A1
WO2018181699A1 PCT/JP2018/013212 JP2018013212W WO2018181699A1 WO 2018181699 A1 WO2018181699 A1 WO 2018181699A1 JP 2018013212 W JP2018013212 W JP 2018013212W WO 2018181699 A1 WO2018181699 A1 WO 2018181699A1
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Prior art keywords
elastic monofilament
elastic
core
sheath
monofilament
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PCT/JP2018/013212
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English (en)
Japanese (ja)
Inventor
成子聡
土倉弘至
山尾亮介
山本博之
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東レ株式会社
東レ・モノフィラメント株式会社
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Publication of WO2018181699A1 publication Critical patent/WO2018181699A1/fr

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    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
    • D03D15/00—Woven fabrics characterised by the material, structure or properties of the fibres, filaments, yarns, threads or other warp or weft elements used
    • D03D15/20—Woven fabrics characterised by the material, structure or properties of the fibres, filaments, yarns, threads or other warp or weft elements used characterised by the material of the fibres or filaments constituting the yarns or threads
    • D03D15/283—Woven fabrics characterised by the material, structure or properties of the fibres, filaments, yarns, threads or other warp or weft elements used characterised by the material of the fibres or filaments constituting the yarns or threads synthetic polymer-based, e.g. polyamide or polyester fibres
    • 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
    • D01F8/00—Conjugated, i.e. bi- or multicomponent, artificial filaments or the like; Manufacture thereof
    • D01F8/04—Conjugated, i.e. bi- or multicomponent, artificial filaments or the like; Manufacture thereof from synthetic polymers
    • D01F8/14—Conjugated, i.e. bi- or multicomponent, artificial filaments or the like; Manufacture thereof from synthetic polymers with at least one polyester as constituent
    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
    • D03D15/00—Woven fabrics characterised by the material, structure or properties of the fibres, filaments, yarns, threads or other warp or weft elements used
    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
    • D03D15/00—Woven fabrics characterised by the material, structure or properties of the fibres, filaments, yarns, threads or other warp or weft elements used
    • D03D15/40—Woven fabrics characterised by the material, structure or properties of the fibres, filaments, yarns, threads or other warp or weft elements used characterised by the structure of the yarns or threads
    • D03D15/41—Woven fabrics characterised by the material, structure or properties of the fibres, filaments, yarns, threads or other warp or weft elements used characterised by the structure of the yarns or threads with specific twist
    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
    • D03D15/00—Woven fabrics characterised by the material, structure or properties of the fibres, filaments, yarns, threads or other warp or weft elements used
    • D03D15/50—Woven fabrics characterised by the material, structure or properties of the fibres, filaments, yarns, threads or other warp or weft elements used characterised by the properties of the yarns or threads
    • D03D15/573—Tensile strength

Definitions

  • the present invention relates to an elastic monofilament having excellent fatigue resistance against repeated deformation in the bending direction. More specifically, it has excellent fatigue resistance against momentary high loads repeatedly applied in the bending direction, and various industrial uses such as marine products, building materials, safety materials, clothing materials, civil engineering materials, agricultural materials, vehicle materials, and sports materials.
  • the present invention relates to an elastic monofilament suitable for use in a woven / knitted structure having elasticity.
  • the present invention also relates to a woven or knitted fabric using the elastic monofilament.
  • thermoplastic elastomer has excellent rubber elasticity. Since woven and knitted fabrics using such monofilaments made of thermoplastic elastomer have excellent elasticity, clothing materials such as stockings, medical materials such as supporters, sports materials such as trampolines, bedding materials such as beds, and office work Development of seating materials such as chairs / car seats is underway.
  • a monofilament made of a thermoplastic elastomer whose main component is polyester or polyether has been known.
  • Conventional woven and knitted fabrics composed of monofilaments made of thermoplastic elastomer have had a problem of a decrease in elastic recovery rate upon repeated deformation, that is, so-called sag during long-term use.
  • an elastic monofilament has been proposed for the purpose of obtaining a woven or knitted fabric excellent in mechanical properties and elastic recovery during repeated deformation.
  • Patent Document 2 is composed of a two-component core-sheath structure, a thermoplastic elastomer as a sheath component, 95 to 100% by mass of a thermoplastic polyester unit as a core component, and an intrinsic viscosity (IV) of 0. .7 or more thermoplastic polyester components are arranged, and the core portion is composed of a thermoplastic polyester component such as polyethylene terephthalate, which is the core component, and the thermoplastic lastomer of the sheath portion, in a specific volume ratio.
  • a thermoplastic polyester component such as polyethylene terephthalate, which is the core component, and the thermoplastic lastomer of the sheath portion, in a specific volume ratio.
  • the elastic monofilament it is considered necessary for the elastic monofilament to maintain high rubber elasticity. That is, in the elastic monofilament of the core-sheath composite structure composed of the two types of thermoplastic elastomers of Patent Document 1, misalignment of the woven / knitted structure is suppressed, and the two types of polymers such as the thermoplastic elastomer of Patent Document 2 and polyethylene terephthalate In the elastic monofilament of the core-sheath composite structure made of the above, it is premised that the rubber elasticity as high as possible is maintained, for example, by suppressing the settling by using a fulcrum of stress applied when the elastic monofilament is bent as a core portion.
  • an object of the present invention is to provide an elastic monofilament that is further excellent in resistance to settling during actual use of an elastic sheet or the like.
  • Another object of the present invention is to provide a woven or knitted fabric that uses the elastic monofilament and has excellent settling resistance during actual use.
  • the elastic monofilament of the present invention has a core-sheath composite structure in which the volume ratio of the core portion is 2 to 25%, the core component is thermoplastic polyester, and the sheath component is a hard segment and a soft segment. It is an elastic monofilament having a Young's modulus of 750 to 5000 N / mm 2 , a tensile strength at 30% elongation of 0.4 to 3.0 cN / dtex, and a bending hardness of 4 cN or more. .
  • the resin constituting the core portion is polyethylene naphthalate (hereinafter sometimes abbreviated as PEN), or polyethylene naphthalate and polyethylene terephthalate (hereinafter PET).
  • PEN polyethylene naphthalate
  • PET polyethylene terephthalate
  • the polyethylene naphthalate is in the range of 70% by mass or more of the core component.
  • the hard segment of the copolymer-based thermoplastic elastomer of the sheath component comprises an aromatic polyester unit as a main constituent unit, and the copolymer-based thermoplastic of the sheath component.
  • the soft segment of the elastomer is mainly composed of an aliphatic polyether unit and / or an aliphatic polyester unit, and the aromatic polyester unit is a polybutylene terephthalate unit, and the aliphatic polyether unit And / or the aliphatic polyester unit is a poly (tetramethylene oxide) glycol unit.
  • the ratio of the hard segment to the soft segment is 35:65 to 75:25 (mass ratio).
  • the dimensional change rate is 0 to 5% when heat-treated for 3 minutes under a constant temperature of 160 ° C. and then held under a tension of 0.1 cN / dtex for 12 hours. .
  • the woven or knitted fabric of the present invention is a woven or knitted fabric using at least a part of the elastic monofilament.
  • a high-rigidity thermoplastic polyester as a core component is combined in a specific configuration to suppress instantaneous bending deformation applied to the elastic monofilament.
  • An elastic monofilament with significantly improved fatigue resistance can be obtained by combining certain rigidity and elasticity. Thereby, it becomes possible to remarkably improve the settling resistance at the time of actual use of a woven or knitted fabric represented by a trampoline, a supporter, a bed, a car seat, an office chair and the like.
  • the elastic monofilament of the present invention has a core-sheath composite structure in which the volume ratio of the core portion is 2 to 25%, the core component is thermoplastic polyester, and the sheath component is a hard segment and a soft segment.
  • a copolymer-type thermoplastic elastomer having a Young's modulus of 750 to 5000 N / mm 2 , a tensile strength at 30% elongation of 0.4 to 3.0 cN / dtex, and a bending hardness of 4 cN or more.
  • the elastic monofilament of the present invention is an instantaneous bending deformation applied to an elastic monofilament by combining a copolymer thermoplastic elastomer and a high-rigidity thermoplastic polyester (for example, polyethylene naphthalate) in a specific configuration.
  • the fatigue resistance is improved in each step by combining the rigidity and elasticity, and there is a remarkable effect on the anti-sagging that could not be obtained with the elastic monofilament of the conventional core-sheath composite structure. It has been found that it can be obtained.
  • the usage mode of the elastic monofilament of the present invention a case where an elastic fabric using an elastic monofilament as a weft and a polyethylene terephthalate monofilament as a warp is used for an office chair or a car seat will be described as an example.
  • the load at the time of sitting is applied to the elastic fabric from a substantially vertical direction.
  • the elastic monofilament whose movement is suppressed by the warp with respect to the load from the vertical direction to the elastic fabric is greatly deformed in the bending direction.
  • the elastic monofilament is compressed inside the bent portion, and the elastic monofilament is greatly expanded outside the bent portion.
  • the conventional core-sheath composite monofilament has the basic principle of compression and extension of the bent portion, but sits on the elastic fabric so as to apply weight to it.
  • the elastic fabric is momentarily subjected to a high load, such as throwing heavy objects, the sheath part inside the bent part is momentarily strongly compressed, and the sheath part outside the bent part is compressed. Strongly stretches. For this reason, it is considered that the deformation beyond the elastically deformable elongation in the bending direction of the elastic monofilament of the core-sheath composite structure occurs instantaneously and causes plastic deformation, and as a result, the woven or knitted fabric is crushed.
  • an elastic monofilament having a core-sheath composite structure in which a high-rigidity polyester is used for the core part and a copolymer thermoplastic elastomer is arranged in a specific configuration in the sheath part Because there is a certain amount of rigidity, the stretch deformation and plastic deformation that occur when a momentary high load is applied are suppressed, and the excellent stretch-back property of the copolymer thermoplastic elastomer placed on the sheath part is impaired. It's hard to get it. Furthermore, creep elongation when exposed to bending deformation for a long time is also suppressed. For this reason, it is thought that the woven or knitted fabric using the elastic monofilament of the present invention is difficult to stick over a long period of time and can continue to exhibit excellent elasticity.
  • the elastic monofilament of the present invention needs to have a core portion ratio in the range of 2 to 25% by volume from the viewpoint of achieving both deformation suppression and elasticity due to a high load instantaneously applied in the bending direction.
  • the ratio of the core portion is less than 2% by volume, the rigidity is insufficient, and when the elastic monofilament is subjected to a momentary high load at the bent portion, the copolymer thermoplastic elastomer outside the bending direction of the sheath portion is plastic. It stretches instantaneously to the deformation region, and it becomes easy to cause settling when it is made into a woven or knitted fabric.
  • the ratio of the core portion exceeds 25% by volume, the elasticity of the elastic monofilament is too high, and thus elasticity is hardly exhibited. From this viewpoint, the range is preferably 3 to 20% by volume, more preferably 5 to 13% by volume.
  • an irregular cross-sectional shape such as an ellipse, a square, a polygon, and a multi-leaf cross-section can be taken in addition to the round cross-section.
  • the elastic monofilament of the present invention has a diameter of 1.0 mm or less and preferably 0.7 mm or less.
  • the diameter is preferably 0.1 mm or more.
  • the diameter of the elastic monofilament in the case where the cross-sectional shape of the elastic monofilament is an irregular cross-sectional shape is the diameter of a circle corresponding to the area of the cross section perpendicular to the fiber direction.
  • the diameter of the elastic monofilament is L1
  • the diameter of the core part in the cross section (hereinafter abbreviated as the diameter of the core part)
  • the center of gravity of the core part in the cross section (hereinafter referred to as the center of gravity of the core part).
  • the thickness of the sheath portion is kept constant over the entire circumference of the elastic monofilament, so that a portion with an extremely small sheath thickness or a large portion does not occur. It is difficult to cause problems such as excessive stretching and tearing of the sheath portion and non-uniform elastic recovery.
  • the elastic monofilament of the present invention needs to have a Young's modulus in the range of 750 to 5000 N / mm 2 from the viewpoint of achieving both suppression of deformation due to a high load instantaneously applied in the bending direction and elasticity.
  • the Young's modulus is less than 750 N / mm 2 , the rigidity is insufficient and the deformation is not sufficiently suppressed. Therefore, when the elastic monofilament is subjected to a momentary high load at the bent portion, the copolymer thermoplastic elastomer on the outside in the bending direction of the sheath portion instantaneously stretches to the plastic deformation region, and becomes a woven or knitted fabric. It becomes easy to cause settling.
  • the elastic monofilament of the present invention needs to have a tensile strength at 30% elongation of 0.4 to 3.0 cN / dtex.
  • the tensile strength is less than 0.4 cN / dtex, when the elastic monofilament is subjected to an instantaneous high load on the bent portion, the copolymer thermoplastic elastomer outside the bending direction of the sheath portion is It stretches instantaneously to the plastic deformation region, and it becomes easy to cause settling when it is made into a woven or knitted fabric. If it exceeds 3.0 cN / dtex, the elasticity of the elastic monofilament is too high, so that it is difficult to develop elasticity. From such a viewpoint, the range is preferably 0.5 to 2.0 cN / dtex, and more preferably 1.0 to 1.5 cN / dtex.
  • the elastic monofilament of the present invention needs to have a bending hardness of 4 cN or more.
  • the bending hardness is less than 4 cN, the rigidity is insufficient, and when a momentary high load is applied in the bending direction, the copolymer thermoplastic elastomer outside the bending direction of the sheath portion instantaneously reaches the plastic deformation region.
  • it is preferably 6 cN or more.
  • thermoplastic polyester constituting the core component of the elastic monofilament of the present invention is preferably polyethylene naphthalate from the viewpoint of achieving both suppression of deformation due to a strong load instantaneously applied in the bending direction and elasticity.
  • the thermoplastic polyester constituting the core component can be a polymer alloy of polyethylene naphthalate and polyethylene terephthalate.
  • the polyethylene naphthalate is preferably 70% by mass or more of the core component.
  • the rigidity is improved, and when the elastic monofilament is momentarily subjected to a high load in the bending direction, the copolymer heat outside the bending direction of the sheath portion Since it is possible to suppress the plastic elastomer from being instantaneously extended to the plastic deformation region, it is more difficult to cause settling in the woven or knitted fabric.
  • the polyethylene naphthalate component is 70 mass% or more, since melt processability becomes favorable, the fluctuation
  • the polyethylene naphthalate is preferably 80% by mass or more of the core component.
  • thermoplastic polyester used for the core component is a matting agent such as titanium oxide, calcium carbonate, kaolin, clay, etc., as long as the effect of the present invention is not impaired, specifically, 5% by mass or less.
  • Pigments, dyes, lubricants, antioxidants, heat resistance agents, heat resistance agents, light resistance agents, ultraviolet absorbers, antistatic agents, flame retardants, and the like can be included.
  • titanium oxide the resulting elastic monofilament is prevented from being shining and a high-quality feeling is produced, and the detailed mechanism is unknown, but from the viewpoint of improving the durability of the elastic monofilament, it is 0.01 to 1% by mass. It is preferable to contain in the range.
  • the copolymer thermoplastic elastomer constituting the elastic monofilament sheath component of the present invention is a copolymer thermoplastic having a hard segment and a soft segment such as a styrene elastomer, a polyester elastomer, a polyurethane elastomer, and a polyamide elastomer. It must be an elastomer. The reason is that blend type thermoplastic elastomers typified by olefinic elastomers are insufficient in heat resistance, and have concerns about interfacial peeling of sea islands, recyclability, and the like.
  • the copolymer thermoplastic elastomer used in the present invention has a melting point of preferably 150 ° C. or higher, more preferably 180 ° C. or higher, from the viewpoints of heat resistance and mechanical properties.
  • the hard segment is mainly formed from an aromatic dicarboxylic acid or an ester-forming derivative thereof and a diol or an ester-forming derivative thereof.
  • the aromatic polyester unit having a structure is preferably used as the main constituent unit.
  • the main constituent unit means a constituent unit contained in a molar fraction of 55% or more, more preferably 70% or more, and further preferably 90% or more.
  • aromatic dicarboxylic acid examples include terephthalic acid, isophthalic acid, phthalic acid, naphthalene-2,6-dicarboxylic acid, naphthalene-2,7-dicarboxylic acid, anthracene dicarboxylic acid, diphenyl-4,4′-dicarboxylic acid.
  • aromatic dicarboxylic acid examples include acid, diphenoxyethanedicarboxylic acid, 4,4′-diphenyl ether dicarboxylic acid, 5-sulfoisophthalic acid, and 3-sulfoisophthalic acid.
  • the aromatic dicarboxylic acid is mainly used. If necessary, a part of the aromatic dicarboxylic acid may be used as a fatty acid such as 1,4-cyclohexanedicarboxylic acid, cyclopentanedicarboxylic acid, or 4,4′-dicyclohexyldicarboxylic acid. It may be substituted with a cyclic dicarboxylic acid or an aliphatic dicarboxylic acid such as adipic acid, succinic acid, oxalic acid, sebacic acid, dodecanedioic acid, and dimer acid. Furthermore, ester-forming derivatives of dicarboxylic acids such as lower alkyl esters, aryl esters, carbonates, and acid halides can of course be used equally.
  • diols having a molecular weight of 400 or less such as 1,4-butanediol, ethylene glycol, trimethylene glycol, pentamethylene glycol, hexamethylene glycol, neopentylene glycol, decamethylene glycol, etc.
  • Aliphatic diols such as 1,1-cyclohexanedimethanol, 1,4-dicyclohexanedimethanol, tricyclodecane dimethanol and the like, and xylylene glycol, bis (p-hydroxy) diphenyl, bis (p -Hydroxy) diphenylpropane, 2,2'-bis [4- (2-hydroxyethoxy) phenyl] propane, bis [4- (2-hydroxyethoxy) phenyl] sulfone, 1,1-bis [4- (2- Hydroxyethoxy) phenyl
  • Aromatic diols such as cyclohexane, 4,4′-dihydroxy-p-terphenyl, and 4,4′-dihydroxy-p-quarterphenyl are preferably used, and such diols are ester-forming derivatives such as acetylated derivatives. Further, it can be used in the form of an alkali metal salt.
  • dicarboxylic acids can be used in combination of two or more.
  • a preferred example of such a hard segment is a polybutylene terephthalate unit derived from terephthalic acid and / or dimethyl terephthalate and 1,4-butanediol. Also preferred are those comprising polybutylene terephthalate units derived from terephthalic acid and / or dimethyl terephthalate and polybutylene isophthalate units derived from isophthalic acid and / or dimethyl isophthalate and 1,4-butanediol. .
  • the soft segment of the polyester elastomer as the copolymer thermoplastic elastomer of the present invention is mainly composed of an aliphatic polyether unit and / or an aliphatic polyester unit.
  • Aliphatic polyethers include poly (ethylene oxide) glycol, poly (propylene oxide) glycol, poly (tetramethylene oxide) glycol, poly (hexamethylene oxide) glycol, copolymers of ethylene oxide and propylene oxide, poly (propylene oxide) Examples thereof include ethylene oxide addition polymers of glycol, and copolymer glycols of ethylene oxide and tetrahydrofuran.
  • polyesters examples include poly ( ⁇ -caprolactone), polyenantlactone, polycaprylolactone, polybutylene adipate, and polyethylene adipate.
  • the elastic properties of the resulting polyester elastomers indicate that poly (tetramethylene oxide) glycol, poly (propylene oxide) glycol ethylene oxide adducts, ethylene oxide and tetrahydrofuran
  • copolymer glycol, poly ( ⁇ -caprolactone), polybutylene adipate, polyethylene adipate and the like is preferred, and among these, poly (tetramethylene oxide) glycol is particularly preferred as a constituent unit.
  • the number average molecular weight of these soft segments is preferably about 300 to 6000 in the copolymerized state.
  • the ratio of the hard segment to the soft segment used in the elastic monofilament of the present invention is preferably in the range of 35:65 to 75:25 (mass ratio).
  • the third component for the purpose of imparting thermal adhesiveness, etc. as long as the effect of the present invention is not impaired, the outside of the sheath portion made of a copolymer thermoplastic elastomer, Or it can arrange
  • the copolymer thermoplastic elastomer constituting the sheath component preferably has a Shore D hardness of 30 to 65.
  • Shore D hardness By setting the Shore D hardness within the above range, it is possible to suppress excessive elongation during bending deformation while controlling the amount of hard segments that are easily plastically deformed.
  • the copolymer thermoplastic elastomer used in the sheath part is within a range not impairing the effects of the present invention, specifically, 5% by mass or less, and gloss of titanium oxide, calcium carbonate, kaolin, clay, etc. It can contain an eraser, a pigment, a dye, a lubricant, an antioxidant, a heat-resistant agent, a heat-resistant agent, a light-resistant agent, an ultraviolet absorber, an antistatic agent, a flame retardant, and the like.
  • the elastic monofilament of the present invention has a dimensional change rate of 0 to 5% when heat-treated for 3 minutes at 160 ° C. under a constant length and then held for 12 hours under a tension of 0.1 cN / dtex. preferable.
  • the heat treatment for 3 minutes at a temperature of 160 ° C. assumes that the elastic monofilament is woven or knitted and is subjected to heat setting or the like. After heat treatment at a constant length of 160 ° C. for 3 minutes, When the rate of dimensional change when held under a tension of 0.1 cN / dtex for 12 hours satisfies the above range, it does not stretch excessively even after being heat-set as a woven or knitted product, and has excellent creep.
  • a more preferable range of the dimensional change rate after being heat-treated for 3 minutes under a constant temperature at 160 ° C. for 12 hours under a 0.1 cN / dtex tension 0 to 3% can be mentioned. .
  • the elastic monofilament of the present invention preferably has a boiling water shrinkage of 3 to 10%.
  • the elastic monofilament of the present invention can be used alone, or a plurality of the elastic monofilaments of the present invention can be used, or the elastic filament of the present invention and a filament of another material can be used together.
  • the elastic monofilament of the present invention can be produced by a core-sheath composite spinning method using a conventionally known co-extrusion equipment, it can be produced with high productivity and at low cost.
  • thermoplastic polyester polymer constituting the core part of the elastic monofilament having a core / sheath composite structure and the copolymer thermoplastic elastomer constituting the sheath part are melted with separate extruders and then measured with a gear pump. And let it flow into the composite pack.
  • the two types of polymers that make up the core and sheath that flowed into the composite pack are filtered through a metal nonwoven fabric filter or metal mesh in the pack, and then introduced into the composite base, where the core is surrounded by the sheath. Is issued.
  • the polymer used for spinning is previously set to a moisture content of less than 200 ppm using a vacuum dryer or the like. It is preferable to do.
  • the moisture content satisfies the above range, in addition to the difficulty of complex abnormality, it becomes easy to obtain an elastic monofilament excellent in durability.
  • a master chip containing a large amount of desired pigments, light resistance agents, antibacterial agents, etc. is prepared, and thermoplasticity is obtained. A necessary amount of these can be blended with a polyester resin and / or copolymerized thermoplastic elastomer for spinning.
  • a light-proofing agent to the copolymerized thermoplastic elastomer in the elastic monofilament of the present invention for the purpose of reducing deterioration due to ultraviolet rays during actual use.
  • a light-resistant additive-added master chip for imparting a light-resistant agent to the elastic monofilament of the present invention “Hytrel” (registered trademark) 21UV manufactured by Toray DuPont can be exemplified.
  • the molten monofilament spun from the composite die is preferably passed through a heating cylinder and / or a heat insulation cylinder arranged immediately below the composite die from the viewpoint of removing the distortion of the molecular structure generated in the die hole.
  • the length of the heating cylinder and / or the heat insulating cylinder is preferably in the range of 10 to 150 mm from the viewpoint of reducing fineness unevenness in the longitudinal direction of the obtained elastic monofilament.
  • the molten monofilament that has passed through the heating tube and / or the heat insulating tube is cooled in a cooling bath using water or polyethylene glycol as a solvent, and then taken up by a take-up roll that rotates at a desired surface speed.
  • the temperature of the cooling bath can be changed while confirming the roundness and fineness unevenness of the obtained elastic monofilament, but the cooling temperature for obtaining the elastic monofilament of the present invention is exemplified by the range of 20 to 80 ° C. can do.
  • the take-up speed may be a speed at which the cooling and solidification of the molten monofilament is completed in the cooling bath, and in order to set the fiber structure of the undrawn yarn within a suitable range for obtaining the elastic monofilament of the present invention. Is preferably 5 to 50 m / min.
  • the unstretched monofilament taken up by the take-up roll is once wound up or is used for the drawing step without being wound up.
  • the number of drawing steps in the drawing step is preferably a multistage drawing method having two or more steps.
  • stretching machine can be used.
  • the stretching temperature at the second stage is set to the melting point ⁇ 50 ° C. to the melting point ⁇ 10 ° C. of the copolymer thermoplastic elastomer disposed in the sheath portion. It is preferable to set.
  • the stretching temperature of the second stage is set to the above range in which the molecular mobility of the copolymer thermoplastic elastomer is high, excessive orientation of the copolymer thermoplastic elastomer in the stretching process is suppressed, and when deformed in the bending direction It is possible to obtain an elastic monofilament having excellent elasticity.
  • the stretched elastic monofilament is then subjected to relaxation heat treatment.
  • the relaxation magnification is preferably in the range of 0.99 to 0.85 from the viewpoint of suppressing yarn swaying and ensuring elastic recovery when subjected to repeated bending deformation.
  • the relaxation heat treatment temperature is preferably set to the melting point of the copolymerized thermoplastic elastomer -50 ° C. to the melting point ⁇ 10 ° C. of the copolymer thermoplastic elastomer arranged in the sheath portion, and more preferably, the melting point of the copolymer thermoplastic elastomer ⁇ 40 An example is from 0 ° C to -10 ° C.
  • the total draw ratio obtained by multiplying the draw ratio by the relaxation ratio is set to less than 7.0 times. It is preferable to do this, and a more preferable range is less than 6.0 times.
  • the elastic monofilament after the relaxation treatment is wound by a winder, and at this time, the winding tension is preferably in the range of 0.10 cN / dtex or less.
  • the winding tension is preferably in the range of 0.10 cN / dtex or less.
  • the elastic monofilament of the present invention can be obtained.
  • the elastic monofilament of the present invention is excellent in fatigue resistance against momentary high load repeatedly applied in the bending direction, so that it is a marine product, building material, safety material, clothing material, civil engineering material, agricultural material, vehicle material, and sports material.
  • it can be suitably used for elastic woven knitting structures such as car seats and office chairs that are susceptible to deformation in the bending direction during actual use.
  • the woven or knitted fabric of the present invention is a woven or knitted fabric using at least a part of the elastic monofilament, and can be manufactured by a conventionally known method.
  • a plain woven fabric, a twill woven fabric, a satin weaving fabric, a double woven fabric obtained by combining these structures, or the like can be appropriately selected depending on the application.
  • the knitted fabric may be either weft knitting or warp knitting.
  • the cut surface obtained by cutting an elastic monofilament in a direction perpendicular to the fiber axis is observed with a digital microscope VHX-100F manufactured by Keyence, and the diameter of the core portion is measured using a digital microscope length measurement tool. From the cross-sectional area of the elastic monofilament obtained by using the area measurement tool and the cross-sectional area of the core portion, the ratio (volume%) of the core portion was obtained.
  • melting point The temperature at which the extreme value of the obtained melting endotherm curve obtained by measuring a 10 mg sample at a heating rate of 10 ° C./min using a differential scanning calorimeter DSC-7 manufactured by PerkinElmer was defined as the melting point.
  • Boiling water shrinkage (boiling yield)
  • Two elastic monofilaments that have been left for 12 hours or longer in a room temperature of 20 ° C. and a humidity of 50% RH are cut into 50 cm lengths and submerged in boiling water for 30 minutes to be taken out and placed in a room temperature of 20 ° C. and a humidity of 50% RH.
  • the length L of the elastic monofilament was measured to the millimeter, and the boiling water shrinkage was calculated by the following formula.
  • Boiling water shrinkage rate (%) ((L ⁇ 500) / 500) ⁇ 100.
  • E 0 the elongation when a load of 0.1 cN / dtex was applied
  • E 12 elongation when left for 12 hours in a state where a load of 0.1 cN / dtex was applied
  • E 12 -E 0 was defined as a dimensional change rate after heat treatment.
  • the number of measurements n was set to 5, and the average value thereof was adopted.
  • the distance (mm) of the perpendicular drawn from the line a connecting the markings toward the maximum deformation point is obtained, and the average value of five measurements is instantaneously bent on the elastic monofilament. The amount of settling caused by the deformation was taken.
  • copolymer thermoplastic elastomer (A-1) 51.9 parts by mass of terephthalic acid, 39.7 parts by mass of 1,4-butanediol and 47.6 parts by mass of poly (tetramethylene oxide) glycol having a number average molecular weight of about 1400, 0.04 part of titanium tetrabutoxide and mono- Both 0.02 parts by mass of n-butyl-monohydroxytin oxide were charged into a reaction vessel equipped with a helical ribbon type stirring blade, gradually heated from a temperature of 190 ° C., and heated to a temperature of 225 ° C. in 3 hours to react. The esterification reaction was carried out with water flowing out of the system.
  • Examples 1 to 4, Comparative Examples 1 and 2 As the polymer used for the core part, a polyethylene naphthalate polymer (TN8065S manufactured by Teijin Ltd.) having a melting point of 272 ° C. dried until the water content is less than 100 ppm is used, and as the polymer used for the sheath part, the water content is less than 100 ppm. Using a copolymerized thermoplastic elastomer (A-1) dried to a temperature of ⁇ 30 mm extruder with a set temperature of 300 ° C.
  • each molten polymer was filtered through a 200-mesh wire mesh, and then discharged from a core-sheath composite die having a circular hole shape, a hole diameter of 1.5 mm, and 10 holes.
  • the discharged molten filament is passed through a heat insulating cylinder having a length of 30 mm attached immediately below the base, and then passed through a 40 ° C.
  • the obtained unstretched monofilament is stretched in the first stage at a stretch ratio described in Table 1 using a hot water tank adjusted to a temperature of 95 ° C. without being wound up, and then listed in Table 1.
  • the second stage stretching was performed at the magnification shown in Table 1.
  • the stretched monofilament is subsequently subjected to relaxation heat treatment at a magnification shown in Table 1 using a dry heat bath adjusted to the temperature shown in Table 1, wound up at the winding tension shown in Table 1, and elastic monofilament Got.
  • the properties of the obtained elastic monofilament were as shown in Table 1 or Table 2.
  • Comparative Example 1 the stretching temperature and the relaxation temperature were low, and it was not possible to suppress over-extension on the outside of the bend, and the amount of settling was large.
  • Comparative Example 2 since both the core portion ratio and the draw ratio were high, the rigidity of the sheath portion was impaired because the rigidity was too high, and the amount of settling was large.
  • Examples 5 to 7, Comparative Example 3 As the polymer used for the core portion, the polyethylene naphthalate, a polyethylene terephthalate polymer (T701T manufactured by Toray Industries, Inc.) containing 0.15% by mass of titanium oxide having a melting point of 257 ° C. dried to a moisture content of less than 100 ppm, This was carried out in the same manner as in Example 1 except that the polymer alloy was used. The properties of the obtained elastic monofilament were as shown in Table 1. A known blend mixer was used for blending the resins. Since the comparative example 3 had a low Young's modulus, the instantaneous bending deformation resistance was impaired, and the amount of settling was large.
  • T701T polyethylene terephthalate polymer
  • Example 8 As the polymer used for the core part, a polyethylene terephthalate polymer (T-301T manufactured by Toray Industries, Inc.) containing a melting point of 257 ° C., an intrinsic viscosity of 0.71, and 0.1% by mass of titanium oxide was used. The same operation as in Example 2 was performed. The properties of the obtained elastic monofilament were as shown in Table 1.
  • Example 4 As a polymer used for the core part, a nylon 6 polymer (M1021T manufactured by Toray Industries, Inc.) having a melting point of 225 ° C., dried to a moisture content of less than 150 ppm, was melted with a ⁇ 30 mm extruder having a set temperature of 250 ° C., and then 250 ° C. This was carried out in the same manner as in Example 1 except that it was introduced into a composite spinning pack kept at 250 ° C. using a gear pump kept at a temperature of. The properties of the obtained elastic monofilament were low Young's modulus, momentary bending deformation resistance was impaired, and the amount of settling was large.
  • Example 8 (Comparative Example 5) Example 8 except that a core-sheath composite die with a hole diameter of 1.5 mm and a number of holes of 20 was used, and that the second stage of stretching was used in the same hot water tank as the first stage of stretching. I did it.
  • the properties of the obtained elastic monofilament were high in both the core ratio and the draw ratio, so that the Young's modulus was high and the rigidity was too high, so that the elasticity of the sheath portion was impaired and the amount of settling was large.
  • Example 9 to 16, Comparative Examples 6 to 9 The elastic monofilaments obtained in Examples 1 to 8 and Comparative Examples 1 to 4 were used as wefts.
  • a warp yarn made of polyethylene terephthalate and having a total fineness of 1670 dtex-288 filament and a polyester multifilament yarn (Toray high-strength polyester) subjected to a sweet twist of 200 T / m was used.
  • a plain weave fabric was produced with a warp density of 25 / 25.4 mm and a weft density of 26 / 25.4 mm.
  • the obtained woven fabric was heat-treated at a temperature of 180 ° C. for 2 minutes with 20% overfeeding only in the warp direction to obtain a woven fabric having a warp density of 25 / 25.4 mm and a weft density of 37 / 25.4 mm.
  • the characteristics of the obtained knitted and knitted fabrics are as shown in Tables 3 and 4.
  • Examples 9 to 16 using the elastic monofilaments obtained in Examples 1 to 8 the amount of settling of the woven or knitted fabric was small.
  • the elastic monofilament of the present invention was excellent in instantaneous bending deformation resistance, elasticity, and fatigue resistance.
  • the woven or knitted fabric of the present invention was excellent in set resistance.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Multicomponent Fibers (AREA)

Abstract

La présente invention concerne un monofilament élastique qui combine en particulier la résistance à la fatigue et la rigidité dans la direction de flexion. Ce monofilament élastique a une structure de composé enveloppe-noyau dans laquelle le rapport volumique de la partie noyau est de 2 à 25 %, le composant du noyau est un polyester thermoplastique, et le composant de l'enveloppe est un élastomère thermoplastique de système de copolymérisation ayant un segment dur et un segment souple. Le module de Young du monofilament élastique est de 50 à 5 000 N/mm2, la résistance à la traction à 30 % d'allongement est de 0,4 à 3,0 cN/dtex, et la rigidité à la flexion est d'au moins 4 cN.
PCT/JP2018/013212 2017-03-31 2018-03-29 Monofilament élastique et articles tricotés tissés WO2018181699A1 (fr)

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004176228A (ja) * 2002-11-28 2004-06-24 Asahi Kasei Fibers Corp 熱接着性複合モノフィラメント
JP2008214847A (ja) * 2007-02-24 2008-09-18 Teijin Monofilament Germany Gmbh 導電性ストランド、それから得られる布およびその使用
WO2015020163A1 (fr) * 2013-08-09 2015-02-12 東レ株式会社 Monofilament élastique

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004176228A (ja) * 2002-11-28 2004-06-24 Asahi Kasei Fibers Corp 熱接着性複合モノフィラメント
JP2008214847A (ja) * 2007-02-24 2008-09-18 Teijin Monofilament Germany Gmbh 導電性ストランド、それから得られる布およびその使用
WO2015020163A1 (fr) * 2013-08-09 2015-02-12 東レ株式会社 Monofilament élastique

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