WO2021132767A1 - Tissu à sensation de refroidissement, fil de polyéthylène associé, et procédé de fabrication de fil de polyéthylène - Google Patents

Tissu à sensation de refroidissement, fil de polyéthylène associé, et procédé de fabrication de fil de polyéthylène Download PDF

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Publication number
WO2021132767A1
WO2021132767A1 PCT/KR2019/018557 KR2019018557W WO2021132767A1 WO 2021132767 A1 WO2021132767 A1 WO 2021132767A1 KR 2019018557 W KR2019018557 W KR 2019018557W WO 2021132767 A1 WO2021132767 A1 WO 2021132767A1
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Prior art keywords
polyethylene
fabric
molecular weight
cold
polyethylene yarn
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PCT/KR2019/018557
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English (en)
Korean (ko)
Inventor
김재형
김기웅
김성용
이상목
이신호
이영수
Original Assignee
코오롱인더스트리 주식회사
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Priority to PCT/KR2019/018557 priority Critical patent/WO2021132767A1/fr
Priority to US17/771,503 priority patent/US20220380948A1/en
Priority to EP19957885.7A priority patent/EP4023800B1/fr
Publication of WO2021132767A1 publication Critical patent/WO2021132767A1/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
    • D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
    • D01D5/00—Formation of filaments, threads, or the like
    • D01D5/08—Melt spinning methods
    • D01D5/088—Cooling filaments, threads or the like, leaving the spinnerettes
    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
    • D01D5/00—Formation of filaments, threads, or the like
    • D01D5/08—Melt spinning methods
    • D01D5/098—Melt spinning methods with simultaneous stretching
    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
    • D01D5/00—Formation of filaments, threads, or the like
    • D01D5/12—Stretch-spinning methods
    • D01D5/16—Stretch-spinning methods using rollers, or like mechanical devices, e.g. snubbing pins
    • 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
    • D01F6/02—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from homopolymers obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • D01F6/04—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from homopolymers obtained by reactions only involving carbon-to-carbon unsaturated bonds from polyolefins
    • D—TEXTILES; PAPER
    • D02—YARNS; MECHANICAL FINISHING OF YARNS OR ROPES; WARPING OR BEAMING
    • D02G—CRIMPING OR CURLING FIBRES, FILAMENTS, THREADS, OR YARNS; YARNS OR THREADS
    • D02G3/00—Yarns or threads, e.g. fancy yarns; Processes or apparatus for the production thereof, not otherwise provided for
    • D02G3/44—Yarns or threads characterised by the purpose for which they are designed
    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
    • D03D13/00—Woven fabrics characterised by the special disposition of the warp or weft threads, e.g. with curved weft threads, with discontinuous warp threads, with diagonal warp or weft
    • D03D13/008—Woven fabrics characterised by the special disposition of the warp or weft threads, e.g. with curved weft threads, with discontinuous warp threads, with diagonal warp or weft characterised by weave density or surface weight
    • 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
    • D03D15/52—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 thermal insulating, e.g. heating or cooling
    • 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
    • D—TEXTILES; PAPER
    • D10—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B2321/00—Fibres made from polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • D10B2321/02—Fibres made from polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds polyolefins
    • D10B2321/021—Fibres made from polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds polyolefins polyethylene
    • D—TEXTILES; PAPER
    • D10—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B2321/00—Fibres made from polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • D10B2321/02—Fibres made from polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds polyolefins
    • D10B2321/021—Fibres made from polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds polyolefins polyethylene
    • D10B2321/0211—Fibres made from polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds polyolefins polyethylene high-strength or high-molecular-weight polyethylene, e.g. ultra-high molecular weight polyethylene [UHMWPE]
    • D—TEXTILES; PAPER
    • D10—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B2401/00—Physical properties
    • D10B2401/06—Load-responsive characteristics
    • D10B2401/063—Load-responsive characteristics high strength
    • D—TEXTILES; PAPER
    • D10—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B2501/00—Wearing apparel

Definitions

  • the present invention relates to a cold-sensitive fabric and a polyethylene yarn and a polyethylene yarn manufacturing method therefor. Specifically, the present invention provides a fabric capable of providing a user with a soft tactile sensation as well as a cooling feeling or cooling sensation, and improved weavability that can be used for manufacturing the fabric. It relates to a polyethylene yarn having, and a method for producing the yarn.
  • Factors that can be considered in developing a fabric that can be used to overcome the sweltering heat include (i) removal of heat factors, and (ii) heat removal from the user's skin.
  • JP 2010-236130A proposes to manufacture a fabric using ultra-high-strength polyethylene fibers (Dyneema® SK60) having high thermal conductivity.
  • the Dyneema® SK60 fiber used in JP 2010-236130A is an Ultra High Molecular Weight Polyethylene (UHMWPE) fiber having a weight average molecular weight of 500,000 g/mol or more, and although it exhibits high thermal conductivity, the Because it can be manufactured only by a gel spinning method due to high melt viscosity, there is a problem that environmental problems are caused and a huge cost is required for recovery of the organic solvent.
  • Dyneema® SK60 fibers have poor weaving properties because they have a high tensile strength of 28 g/de or more, a high tensile modulus of 759 g/de or more, and a low elongation at break of 3-4%.
  • Dyneema® SK60 fiber has a problem that its stiffness is too high, which makes it unsuitable for use in the production of cold-sensitive fabrics that are in contact with the user's skin.
  • the present invention relates to a cold-sensitive fabric capable of preventing problems due to the limitations and disadvantages of the related art, and a polyethylene yarn and a polyethylene yarn manufacturing method therefor.
  • One aspect of the present invention is to provide a fabric capable of providing a user with a feeling of coolness or coolness as well as a soft touch.
  • Another aspect of the present invention is to provide a polyethylene yarn having improved weaving properties that can be used in the manufacture of a fabric that can provide a user with a feeling of coolness or coolness as well as a soft touch.
  • Another aspect of the present invention is to provide a method for producing a polyethylene yarn having improved weaving properties that can be used in the production of a fabric that can provide a user with a feeling of coolness or coolness as well as a soft touch.
  • a plurality of polyethylene yarns are included, wherein each of the polyethylene yarns has a tensile strength of 3.5 to 8.5 g/de, a tensile modulus of 15 to 80 g/de, and a breakage of 14 to 55%.
  • a cold-sensitive fabric which is a polyethylene yarn having an elongation and a crystallinity of 55 to 85%, is provided.
  • the polyethylene yarn may have a crystallinity of 60 to 85%.
  • the polyethylene yarn may include a polyethylene polymer having a density of 0.941 to 0.965 g/cm 3 , a weight average molecular weight (Mw) of 50,000 to 99,000 g/mol, and a number average molecular weight (Mn) of 10,500 to 14,000 g/mol. have.
  • the ratio of the weight average molecular weight to the number average molecular weight of the polyethylene may be 5.5 to 9.
  • the polyethylene yarn may have a total fineness of 75 to 450 denier, and the polyethylene yarn may include filaments having a Denier per Filament (DPF) of 1 to 5.
  • DPF Denier per Filament
  • the polyethylene yarn may have a circular cross-section.
  • the weight per unit area (area density) of the cold-sensitive fabric may be 150 to 800 g/m 2 , and the thermal conductivity in the thickness direction of the cold-sensitive fabric at 20 ° C. may be 0.0001 W/cm ° C. or more, and at 20 ° C.
  • the heat transfer coefficient in the thickness direction of the cold-sensitive fabric may be 0.001 W/cm 2 ⁇ °C or more, and the contact cooling sensation (Q max ) of the cold-sensitive fabric at 20°C may be 0.1 W/cm 2 or more.
  • the cold-sensitive fabric may be a fabric including the polyethylene yarns as weft yarns and warp yarns.
  • the cover factor of the fabric defined by Equation 1 below may be 400 to 2,000.
  • Equation 1 CF is a cover factor, W D is warp density (ea/inch), W T is warp fineness (denier), F D is weft density (ea/inch), and F T is weft fineness (denier).
  • the polyethylene yarn may have a crystallinity of 60 to 85%.
  • the polyethylene yarn may include a polyethylene polymer having a density of 0.941 to 0.965 g/cm 3 , a weight average molecular weight (Mw) of 50,000 to 99,000 g/mol, and a number average molecular weight (Mn) of 10,500 to 14,000 g/mol. have.
  • the ratio of the weight average molecular weight to the number average molecular weight of the polyethylene may be 5.5 to 9.
  • the polyethylene yarn may have a total fineness of 75 to 450 denier, and the polyethylene yarn may include filaments having a DPF of 1 to 5.
  • the polyethylene yarn may have a circular cross-section.
  • a method for producing a polyethylene yarn for a cold-sensitive fabric comprising the step of stretching a multifilament made of the cooled filaments.
  • the polyethylene may have a melt index (MI) of 1 to 25 g/10 min at 190 °C.
  • the ratio of the weight average molecular weight to the number average molecular weight of the polyethylene may be 5.5 to 9.
  • the stretching step may be performed at a stretching ratio of 2.5 to 8.5.
  • the cold-sensitive fabric of the present invention is woven with a yarn having high thermal conductivity, it is possible to consistently provide a feeling of cooling to the user regardless of external factors such as humidity.
  • the cold-sensitive fabric of the present invention can continuously provide a sufficient feeling of cooling to the user without sacrificing breathability.
  • the cold-sensitive fabric of the present invention can be easily manufactured at a relatively low cost without causing environmental problems, and has the advantage of providing a soft touch to the user.
  • FIG. 1 schematically shows an apparatus for manufacturing a polyethylene yarn according to an embodiment of the present invention
  • FIG. 3 schematically shows an apparatus for measuring thermal conductivity and heat transfer coefficient in a thickness direction of a cold-sensitive fabric.
  • the cold-sensitive fabric according to an embodiment of the present invention may be a woven fabric or a knitted fabric.
  • the yarns used for manufacturing the fabric are preferably polymer yarns having high thermal conductivity.
  • heat is generally transferred through the movement of free electrons and lattice vibrations called 'phonons'.
  • heat is mainly transferred in the solid by the movement of free electrons.
  • heat is mainly transferred in the solid through phonons (especially in the direction of molecular chains connected through covalent bonds).
  • high-density polyethylene is used to prepare a polymer yarn having such a high degree of crystallinity.
  • LDPE low density polyethylene
  • LLDPE linear low density polyethylene
  • the high-density polyethylene (HDPE) yarn used for manufacturing the cold-sensitive fabric of the present invention has a crystallinity of 55 to 85%, preferably 60 to 85%.
  • high-density polyethylene (HDPE) yarns can be classified into ultra-high molecular weight polyethylene (UHMWPE) yarns and high molecular weight polyethylene (HMWPE) yarns according to their weight average molecular weight (Mw).
  • UHMWPE generally refers to a linear polyethylene having a weight average molecular weight (Mw) of at least 500,000 g/mol
  • HMWPE generally refers to a linear polyethylene having a weight average molecular weight (Mw) of 20,000 to 250,000 g/mol .
  • HMWPE has a relatively low melt viscosity compared to UHMWPE, melt spinning is possible, and as a result, environmental problems and high cost associated with UHMWPE yarns can be overcome.
  • the finally obtained HMWPE yarn is 13 g/de It has a high tensile strength of more than 300 g/de, a high tensile modulus of 300 g/de or more, and a low elongation at break of 10% or less. Accordingly, as with UHMWPE yarn, its weaving property is not good and its stiffness is too high, so it is unsuitable for use in the manufacture of cold-sensitive fabric that is premised on contact with the user's skin.
  • Mw weight average molecular weight
  • the polyethylene yarn of the present invention is 55 to 85%, preferably It has a crystallinity of 60 to 85%, a tensile strength of 3.5 to 8.5 g/de, a tensile modulus of 15 to 80 g/de, and an elongation at break of 14 to 55%.
  • the tensile strength exceeds 8.5 g/de, the tensile modulus exceeds 80 g/de, or the elongation at break is less than 14%, the weaving property of the polyethylene yarn is not good and the fabric manufactured using the same is too stiff. This makes the user feel uncomfortable.
  • the fabric may become lint ( pills) are induced.
  • the polyethylene yarn may have a tensile strength of 3.5 to 8.5 g/de, or 4.5 to 7.0 g/de, or 5.0 to 6.5 g/de.
  • the polyethylene yarn may have a tensile modulus of 15 to 80 g/de, or 20 to 70 g/de, or 30 to 65 g/de, or 40 to 60 g/de, or 45 to 60 g/de. have.
  • the polyethylene yarn may have an elongation at break of 14 to 55%, or 15 to 40%, or 16 to 30%, or 17 to 20%.
  • the polyethylene yarn may have a crystallinity of 55 to 85%, or 60 to 85%, or 65 to 75%.
  • the polyethylene yarn of the present invention is 50,000 to 99,000 It may include high density polyethylene (HDPE) having a weight average molecular weight (Mw) of g/mol and a number average molecular weight (Mn) of 10,500 to 14,000 g/mol.
  • HDPE high density polyethylene
  • the polyethylene preferably has a weight average molecular weight (Mw) of 50,000 g/mol or more.
  • the polyethylene preferably has a weight average molecular weight (Mw) of 99,000 g/mol or less.
  • the polyethylene may have a weight average molecular weight (Mw) of 50,000 to 99,000 g/mol, or 65,000 to 99,000 g/mol, or 75,000 to 99,000 g/mol.
  • Mw weight average molecular weight
  • the weight average molecular weight (Mw) and number average molecular weight (Mn) of the polyethylene may be measured by using the following gel permeation chromatography (GPC) after completely dissolving the polyethylene yarn in a solvent.
  • GPC gel permeation chromatography
  • the ratio of the weight average molecular weight (Mw) to the number average molecular weight (Mn) of the polyethylene (Mw / Mn ratio), that is, the polydispersity index (Poly Dispersity Index: PDI) is 5.5 to 9 , or 6.0 to 9.0, or 6.4 to 8.5.
  • the PDI of the polyethylene is less than 5.5, the flowability is not good due to a relatively narrow molecular weight distribution, and the processability during melt extrusion is poor, and trimming is caused due to non-uniform discharge during the spinning process. Conversely, when the PDI of the polyethylene exceeds 9, melt flowability and processability during melt extrusion are improved due to a wide molecular weight distribution, but the resulting polyethylene yarn has a tensile strength of 3.5 g/de or more because it contains too much low molecular weight polyethylene. And it becomes difficult to express a tensile modulus of 15 g/de or more, and as a result, lint is induced in the fabric.
  • the polyethylene yarn of the present invention includes filaments having a DPF of 1 to 5, and may have a total fineness of 75 to 450 denier.
  • the DPF Degree Per Filament
  • the smoothness of the fabric made of the polyethylene yarn becomes insufficient, and the contact area with the body becomes small. Due to this, it is not possible to provide sufficient cooling sensation to the user.
  • the DPF can be adjusted through the discharge amount (hereinafter, “single hole discharge amount”) and the draw ratio for each hole of the nozzle.
  • the polyethylene yarn of the present invention may have a circular cross-section or a non-circular cross-section, but preferably has a circular cross-section in that it can provide a user with a uniform feeling of cooling.
  • the cold-sensitive fabric of the present invention made of the above-described polyethylene yarn may be a fabric or knitted fabric having a weight per unit area (ie, areal density) of 150 to 800 g/m 2 . If the areal density of the fabric is less than 150 g/m 2 , the density of the fabric is insufficient and many voids exist in the fabric, and these voids reduce the cold sensitivity of the fabric. On the other hand, when the areal density of the fabric exceeds 800 g/m 2 , the fabric becomes very stiff due to an excessively dense fabric structure, a problem occurs in the user's tactile feel, and problems in use are caused due to the high weight.
  • areal density of the fabric is less than 150 g/m 2 , the density of the fabric is insufficient and many voids exist in the fabric, and these voids reduce the cold sensitivity of the fabric.
  • the areal density of the fabric exceeds 800 g/m 2 , the fabric becomes very stiff due to an excessively dense fabric structure, a problem occurs
  • the cold-sensitive fabric of the present invention may be a fabric having a cover factor of 400 to 2,000.
  • the cover factor is defined by Equation 1 below.
  • Equation 1 CF is a cover factor, W D is warp density (ea/inch), W T is warp fineness (denier), F D is weft density (ea/inch), and F T is weft fineness (denier).
  • the cover factor is less than 400, there is a problem in that the density of the fabric is insufficient and the cold sensitivity of the fabric is deteriorated due to too many pores in the fabric.
  • the cover factor exceeds 2,000, the density of the fabric is excessively increased, so that the tactile feel of the fabric is deteriorated and problems in use may be caused due to the high fabric weight.
  • the cold-sensitive fabric of the present invention has a thermal conductivity of 0.0001 W/cm ⁇ °C or more, or 0.0003 to 0.0005 W/cm ⁇ °C, or 0.00035 to 0.00047 W/cm ⁇ °C;
  • the heat transfer coefficient in the thickness direction of the cold-sensitive fabric at 20 °C is 0.001 W/cm 2 ⁇ °C or more, or 0.01 to 0.02 W/cm 2 ⁇ °C, or 0.012 to 0.015 W/cm 2 ⁇ °C.
  • the cold-sensitive fabric of the present invention at 20 °C 0.1 W/cm 2 or more, or 0.1 to 0.3 W/cm 2 , or 0.1 to 0.2 W/cm 2 It has a contact cooling feeling (Q max ).
  • Q max contact cooling feeling
  • an HDPE chip is introduced into the extruder 100 .
  • the polyethylene used in the present invention is a high density polyethylene (HDPE) having a density of 0.941 to 0.965 g/cm 3 , preferably a weight average molecular weight (Mw) of 50,000 to 99,000 g/mol and a number of 10,500 to 14,000 g/mol It has an average molecular weight (Mn).
  • HDPE high density polyethylene
  • the polyethylene yarn In order to produce a fabric providing a high cooling sensation, the polyethylene yarn should have a high crystallinity of 55 to 85%, preferably 65 to 85%, and in order to prepare a polyethylene yarn having such a high crystallinity, 0.941 to 0.965 g/ The use of HDPE with a density of cm 3 is essential.
  • the weight average molecular weight (Mw) of the HDPE is less than 50,000 g/mol, it is difficult for the finally obtained polyethylene yarn to exhibit a tensile strength of 3.5 g/de or more and a tensile modulus of 15 g/de or more. , as a result, lint is induced in the fabric.
  • the weight average molecular weight (Mw) of the HDPE exceeds 99,000 g/mol, the weaving property of the polyethylene yarn is not good due to excessively high tensile strength and tensile modulus, and its stiffness is too high to prevent contact with the user's skin. It is unsuitable for use in the manufacture of cold-sensitive fabrics on the premise.
  • the ratio of the weight average molecular weight (Mw) to the number average molecular weight (Mn) of the HDPE (Mw/Mn ratio), that is, the polydispersity index (PDI) may be 5.5 to 9. If the PDI of the HDPE is less than 5.5, the flowability is not good due to a relatively narrow molecular weight distribution, and the processability during melt extrusion is deteriorated, resulting in trimming due to non-uniform discharge during the spinning process.
  • melt flowability and processability during melt extrusion are improved due to a wide molecular weight distribution, but the resulting polyethylene yarn has a tensile strength of 3.5 g/de or more because it contains too much low molecular weight polyethylene. And it becomes difficult to have a tensile modulus of 15 g/de or more, as a result, lint is induced on the fabric.
  • the HDPE may have a melt index (Melt Index: MI) of 1 to 25 g / 10 min at 190 °C. If the melt index (MI) of HDPE is less than 1 g/10min, it is difficult to ensure smooth flow in the extruder 100 due to the high viscosity and low flowability of the molten HDPE, and it is difficult to ensure uniformity of the extrudate.
  • MI Melt Index
  • melt index (MI) of HDPE exceeds 25 g/10 min, the flowability in the extruder 100 becomes relatively good, but the polyethylene yarn finally obtained has a tensile strength of 3.5 g/de or more and 15 It can be difficult to have a tensile modulus greater than g/de.
  • a spinning dope further comprising a fluorine-based polymer in addition to HDPE may be used.
  • the fluorine-based polymer may be a tetrafluoroethylene copolymer.
  • Such spinning dope is, (i) a method in which a master batch containing HDPE and a fluorine-based polymer is put into the extruder 100 together with HDPE chips and then melted therein, or (ii) HDPE chips are prepared It may be obtained by a method of introducing a fluorine-based polymer into the extruder through a side feeder while being introduced into the extruder 100 and then melting them together.
  • the fluorine-based polymer may be present in the spin dope in an amount such that the content of fluorine in the spin dope is 50 to 2500 ppm.
  • the spinning dope is conveyed to the nozzle 200 by a screw (not shown) in the extruder 100 , and is extruded through a plurality of holes formed in the nozzle 200 .
  • the number of holes in the slit 200 may be determined according to the total fineness of the yarn to be manufactured. For example, when manufacturing a yarn having a total fineness of 75 denier, the spinneret 200 may have 20 to 75 holes. And, when manufacturing a yarn having a total fineness of 450 denier, the spit 200 may have 90 to 450 holes, preferably 100 to 400 holes.
  • the melting process in the extruder 100 and the extrusion process through the spinneret 200 are preferably performed at 150 to 315 °C, preferably 250 to 315 °C, more preferably 265 to 310 °C. That is, the extruder 100 and the detention 200 are preferably maintained at 150 to 315 °C, preferably at 250 to 315 °C, more preferably at 265 to 310 °C.
  • the spinning temperature is less than 150 °C, the spinning may be difficult because the HDPE is not uniformly melted due to the low spinning temperature.
  • the radiation temperature exceeds 315 ° C, thermal decomposition of HDPE may be caused, which may make it difficult to express high strength.
  • L/D which is the ratio of the hole length (L) to the hole diameter (D) of the nozzle 200, may be 3 to 40. If L/D is less than 3, a die swell phenomenon occurs during melt extrusion and it becomes difficult to control the elastic behavior of HDPE, resulting in poor spinnability. In addition, when the L/D exceeds 40, a discharge non-uniformity phenomenon due to pressure strengthening may occur along with trimming due to a necking phenomenon of the molten HDPE passing through the nozzle 200 .
  • a plurality of filaments 11 formed while spinning dope is discharged from the holes of the nozzle 200 are completely solidified by cooling in a quenching zone 300 . Cooling of the filaments 11 may be performed by an air cooling method.
  • the cooling of the filaments 11 in the cooling unit 300 is preferably performed to be cooled to 15 to 40 °C using a cooling wind of 0.2 to 1 m/sec wind speed. If the cooling temperature is less than 15 °C, the elongation may be insufficient due to overcooling, and trimming may occur during the stretching process. If the cooling temperature exceeds 40 °C, the fineness deviation between the filaments increases due to the non-uniformity of solidification can
  • the cooling and completely solidified filaments 11 are focused by the focusing unit 400 to form the multifilament 10 .
  • the cooled filaments 11 using an oil roller OR or an oil jet may further comprise the step of applying an emulsion.
  • the oil applying step may be performed through a metered oiling (MO) method.
  • the multifilament 10 forming step and the emulsion applying step through the collimator 400 may be simultaneously performed.
  • the polyethylene yarn of the present invention may be prepared by stretching the undrawn yarn at a draw ratio of 2.5 to 8.5, preferably 3.5 to 7.5. That is, the polyethylene yarn of the present invention can be manufactured through a two-step process of once undrawn yarn is prepared by melt-spinning HDPE and then the undrawn yarn is drawn.
  • the polyethylene yarn of the present invention may be manufactured through a direct spin stretching (DSD) process. That is, the multifilament 10 is directly transferred to the multi-stage stretching unit 500 including a plurality of godet roller units GR1...GRn and is multi-staged at a total draw ratio of 2.5 to 8.5, preferably 3.5 to 7.5. After it may be wound on the winder (600).
  • This direct spinning (DSD) process is advantageous in terms of productivity and manufacturing cost compared to the two-step process.
  • the finally obtained polyethylene yarn cannot have a crystallinity of 55% or more, so that the fabric made of the yarn cannot provide a sufficient cooling sensation to the user, and (ii) Since the polyethylene yarn cannot have a tensile strength of 3.5 g/de or more, a tensile modulus of 15 g/de or more, and an elongation at break of 55% or less, lint may be induced on the fabric made of the yarn.
  • the finally obtained polyethylene yarn cannot have a tensile strength of 8.5 g/de or less, a tensile modulus of 80 g/de or less, and an elongation at break of 14% or more. Not only is it not good, but the fabric manufactured using the fabric is too stiff, which makes the user feel uncomfortable.
  • the multi-stage stretching unit 500 has a total draw ratio of 2.5 to 8.5, preferably 3.5 to 7.5. In order to be applied to the filament 10, the linear velocity of the remaining godet roller parts is appropriately determined.
  • the polyethylene through the multi-stage stretching unit 500 by appropriately setting the temperature of the godet roller parts (GR1...GRn) of the multi-stage stretching unit 500 in the range of 40 to 140 °C. Heat-setting of the yarn may be performed.
  • the temperature of the first godet roller unit GR1 may be 40 to 80 °C
  • the temperature of the last godet roller unit GRn may be 110 to 140 °C.
  • the temperature of each of the godet roller parts other than the first and last godet roller parts GR1 and GRn may be set equal to or higher than the temperature of the godet roller part immediately preceding it.
  • the temperature of the last godet roller part GRn may be set equal to or higher than the temperature of the godet roller part immediately preceding, but may be set somewhat lower than that.
  • the multi-stage stretching and heat setting of the multi-filament 10 are simultaneously performed by the multi-stage stretching unit 500, and the multi-stage stretched multi-filament 10 is wound around the winder 600, thereby the polyethylene yarn for cold-sensitive fabric of the present invention. is completed
  • a polyethylene yarn containing 200 filaments and having a total fineness of 400 denier was prepared using the apparatus illustrated in FIG. 1 . Specifically, a density of 0.964 g/cm 3 , a weight average molecular weight (Mw) of 98,290 g/mol, a number average molecular weight (Mn) of 11,730 g/mol, and a melt index (MI at 190°C) of 3 g/10min were obtained.
  • a spin dope was obtained by melting the HDPE chip having the input into the extruder 100, and the spin dope was extruded through a spinneret 200 having 200 holes. L/D, which is the ratio of the hole length (L) to the hole diameter (D) of the nozzle 200, was 6. The detention temperature was 290 °C.
  • the filaments 11 formed while being discharged from the nozzle 200 were finally cooled to 30° C. by the cooling wind at a wind speed of 0.45 m/sec in the cooling unit 300, and the multifilaments 10 by the collector 400. was focused and moved to the multi-stage stretching unit 500 .
  • the multi-stage stretching part 500 is composed of a total of 5 godet roller parts, and the temperature of the godet roller parts is set to 70 to 115 ° C., but the temperature of the godet roller part at the rear end is the same as the godet roller part temperature of the front end. or set high.
  • the multifilament 10 was stretched to a total draw ratio of 7.5 by the multi-stage stretching unit 500 and then wound around the winder 600 to obtain a polyethylene yarn.
  • HDPE chip having a density of 0.958 g/cm 3 , a weight average molecular weight (Mw) of 87,660 g/mol, a number average molecular weight (Mn) of 13,510 g/mol, and a melt index (MI at 190° C.) of 6.4 g/10 min.
  • Mw weight average molecular weight
  • Mn number average molecular weight
  • MI at 190° C. melt index
  • HDPE chips having a density of 0.961 g/cm 3 , a weight average molecular weight (Mw) of 78,620 g/mol, a number average molecular weight (Mn) of 12,150 g/mol, and a melt index (MI at 190° C.) of 11 g/10 min.
  • Mw weight average molecular weight
  • Mn number average molecular weight
  • MI melt index
  • a 0.32 mm thick fabric (warp density: 30 ea/inch, weft density: 30 ea/inch) was obtained by performing plain weaving using the polyethylene yarn as warp and weft yarn.
  • a polyethylene yarn was obtained in the same manner as in Example 1, except that the number of filaments constituting the polyethylene yarn (total fineness: 400 denier) was 48.
  • a polyethylene yarn was obtained in the same manner as in Example 3, except that the number of filaments constituting the polyethylene yarn (total fineness: 400 denier) was 48.
  • HDPE chips having a density of 0.961 g/cm 3 , a weight average molecular weight (Mw) of 180,000 g/mol, a number average molecular weight (Mn) of 25,714 g/mol, and a melt index (MI at 190° C.) of 0.5 g/10 min. was used, and a polyethylene yarn was obtained in the same manner as in Example 1, except that it was drawn at a total draw ratio of 14 through a multi-stage stretching unit 500 composed of a total of 8 godet roller units.
  • Mw weight average molecular weight
  • Mn number average molecular weight
  • MI at 190° C. melt index
  • tensile strength (g/de), tensile modulus (g/de), and elongation at break (%) of polyethylene yarn using a universal tensile tester of Instron Engineering Corp, Canton, Mass. ) were measured respectively.
  • the sample length was 250 mm
  • the tensile speed was 300 mm/min
  • the initial load was set to 0.05 g/d.
  • the crystallinity of the polyethylene yarn was measured using an XRD device (X-ray Diffractometer) [Manufacturer: PANalytical, Model Name: EMPYREAN]. Specifically, a sample having a length of 2.5 cm was prepared by cutting polyethylene yarn, and after fixing the sample in a sample holder, measurement was performed under the following conditions.
  • XRD device X-ray Diffractometer
  • the fabric sample 23 is placed on a base plate (also referred to as 'Water-Box') 21 maintained at 20°C, and the T- A Box 22a (contact area: 3 cm ⁇ 3 cm) was placed on the fabric sample 23 for only 1 second. That is, the other surface of the original sample 23, one surface of which is in contact with the base plate 21, was brought into instantaneous contact with the T-Box (22a).
  • the contact pressure applied to the fabric sample 23 by the T-Box 22a was 6 gf/cm 2 .
  • the Q max value displayed on a monitor (not shown) connected to the device was recorded. This test was repeated 10 times, and an arithmetic mean value of the obtained Q max values was calculated.
  • the fabric sample 23 is placed on the base plate 21 maintained at 20 ° C., and the BT-Box 22b heated to 30 ° C. (contact area: 5 cm ⁇ 5 cm) was placed on the fabric sample 23 for 1 minute. Heat was continuously supplied to the BT-Box 22b so that the temperature could be maintained at 30° C. even while the BT-Box 22b was in contact with the fabric sample 23 .
  • the amount of heat supplied to maintain the temperature of the BT-Box 22b ie, heat flow loss
  • K is the thermal conductivity (W/cm ⁇ °C)
  • D is the thickness (cm) of the fabric sample 23
  • W is the heat flow loss (Watt)
  • k is the heat transfer coefficient (W/cm 2 ⁇ °C).
  • the stiffness of the fabric was measured by the circular bend method using a stiffness measuring device according to ASTM D 4032. The lower the stiffness (kgf), the softer the fabric.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Artificial Filaments (AREA)

Abstract

Sont divulgués : un tissu à sensation de refroidissement, qui peut fournir une sensation de fraîcheur ou une sensation de refroidissement et une sensation tactile douce à un utilisateur ; un fil de polyéthylène associé ; et son procédé de fabrication. Le tissu à sensation de refroidissement de l'invention comprend : plusieurs trames ; et plusieurs chaînes, chacune des trames et des chaînes étant un fil de polyéthylène ayant de 3,5 à 8,5 g/de de résistance à la traction, de 15 à 80 g/de de module d'élasticité en traction, de 14 à 55 % d'allongement à la rupture et de 55 à 85 % de degré de cristallinité.
PCT/KR2019/018557 2019-12-27 2019-12-27 Tissu à sensation de refroidissement, fil de polyéthylène associé, et procédé de fabrication de fil de polyéthylène WO2021132767A1 (fr)

Priority Applications (3)

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PCT/KR2019/018557 WO2021132767A1 (fr) 2019-12-27 2019-12-27 Tissu à sensation de refroidissement, fil de polyéthylène associé, et procédé de fabrication de fil de polyéthylène
US17/771,503 US20220380948A1 (en) 2019-12-27 2019-12-27 Skin cooling fabric, polyethylene yarn therefor, and method for manufacturing polyethylene yarn
EP19957885.7A EP4023800B1 (fr) 2019-12-27 2019-12-27 Tissu à sensation de refroidissement, fil de polyéthylène associé, et procédé de fabrication de fil de polyéthylène

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PCT/KR2019/018557 WO2021132767A1 (fr) 2019-12-27 2019-12-27 Tissu à sensation de refroidissement, fil de polyéthylène associé, et procédé de fabrication de fil de polyéthylène

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JP2002266206A (ja) 2001-03-14 2002-09-18 Mitsubishi Rayon Co Ltd アセテート複合織編物
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JP2004323983A (ja) * 2003-04-21 2004-11-18 Japan Polyolefins Co Ltd モノフィラメントおよびその製造方法
JP4227837B2 (ja) 2003-05-21 2009-02-18 グンゼ株式会社 涼感付与繊維、涼感付与繊維の製造方法、及び、涼感付与繊維製品
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EP4023800B1 (fr) 2024-06-26
US20220380948A1 (en) 2022-12-01
EP4023800A4 (fr) 2023-05-31

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