Polyethylene yarn with improved weaving properties and functional fabric containing the same

Abstract

The present invention relates to a polyethylene yarn having improved weaving properties and a functional fabric containing the same, and more particularly to a polyethylene yarn having improved weaving properties that can provide a user with an appropriate cool feeling and excellent wearing comfort and enable the production of a fabric with an extremely low incidence of fuzz, and a functional fabric containing the same.The polyethylene yarn according to the present invention has a polydispersity index (PDI) of 5 to 20, a tenacity of 1.5 to 10 g / d as measured according to ASTM D2256, and an elongation at maximum strength of 10 to 50%.

Description

[Technical Field]

[0001] The present invention relates to a polyethylene yarn having improved weaving properties and a functional fabric containing the same, and more particularly to a polyethylene yarn having improved weaving properties that can provide a user with an appropriate cool feeling and an excellent wearing comfort and can produce a fabric with an extremely low incidence of fluffing, and to a functional fabric and a cool feeling product containing the same. [Background technology]

[0002] Recently, due to the improvement of living standards and population growth, the demand for textiles has been shifting from general-purpose yarns for general clothing and industrial fibers to advanced textile materials with high functionality and performance, which have a variety of functions. In particular, the development of textile materials with a cooling effect that provides comfort to users in summer and in high-temperature working environments is currently being actively pursued.

[0003] Cooling fiber materials are imparted with a cooling sensation by utilizing the thermal conductivity of the fiber itself, or by adjusting the thermal conductivity of the surface of the fiber material through coating with a metal component having high thermal conductivity, etc. In particular, cooling fiber materials that utilize the thermal conductivity of the fiber itself can be manufactured through the fabric weaving process alone, and can maintain a cooling sensation even after washing, so they are currently being produced in a variety of industrial fields.

[0004] Conventionally, as disclosed in Japanese Patent Publication JP2010-236130A and Korean Patent Publication No. 10-2017-0135342, attempts have been made to utilize the excellent thermal conductivity of high molecular weight polyethylene (HMWPE) fibers to apply them to a variety of fashion clothing and technical textile fields that require a high cooling sensation, such as sportswear, mountain climbing clothing, and workwear.

[0005] However, conventional high molecular weight polyethylene fibers have high strength because they are manufactured as yarns with maximized crystallinity and orientation to achieve a cool feel, but they have the disadvantages of low elongation of the yarns, which reduces weaving ability, and low flexibility, which makes the manufactured fabrics relatively uncomfortable to wear. Summary of the Invention [Problem to be solved by the invention]

[0006] An object of the present invention is to provide a polyethylene raw yarn with improved weaving properties that can provide a user with an appropriate cool feeling and excellent wearing comfort and that can produce a fabric with an extremely low frequency of fuzzing, a functional fabric containing the same, and a cool feeling product. [Means for solving the problem]

[0007] The polyethylene raw yarn according to the present invention has a polydispersity index (PDI) of 5 or more and 20 or less, a strength measured according to ASTM D2256 of 1.5 to 10 g / d, and an elongation at maximum strength of 10 to 50%.

[0008] In a polyethylene raw yarn according to one embodiment of the present invention, the polyethylene raw yarn satisfies the following Equation 1 in a weight distribution graph obtained by gel permeation chromatography (GPC) analysis, where the log scale of molecular weight (Mw) is on the x-axis and the weight distribution (dw / dLogM) is on the y-axis, and the weight distribution graph may be unimodal.

[0009] [Formula 1] (Mw max -Mw aver )<(Mw aver -Mw min )

[0010] (In the above formula, Mw aver is the molecular weight having the maximum weight distribution in the weight distribution graph, and Mw max and Mw min is Mw averFor the weight distribution value Q at 0.25Q in the weight distribution graph, Mw maw The maximum of the two molecular weights is Mw min means the minimum value.)

[0011] In the polyethylene yarn according to one embodiment of the present invention, the yarn may have an initial modulus of 30 to 80 d / g as measured according to ASTM2256.

[0012] In the polyethylene yarn according to one embodiment of the present invention, the yarn may have a crystallinity of 65 to 85%.

[0013] In one embodiment of the present invention, the polyethylene yarn has a density of 0.93 to 0.97 g / cm 3 It is possible.

[0014] In the polyethylene yarn according to one embodiment of the present invention, the yarn may have a weight average molecular weight of 90,000 to 400,000 g / mol.

[0015] The polyethylene fabric according to the present invention comprises the polyethylene yarn described above.

[0016] In one embodiment of the present invention, the polyethylene fabric has a coolness to touch of 0.18 to 0.30 W / cm, measured at 20±2°C and 65±2% RH by contacting a 30±2°C hot plate (T-box) with the 20±2°C fabric. 2 It is possible.

[0017] In the polyethylene fabric according to one embodiment of the present invention, the fabric may have a thermal conductivity of 0.05 to 0.20 W / mK in the thickness direction, measured at 20±2°C and 65±2% RH by contacting a heat source plate (BT-box) at 30±2°C with the fabric at 20±2°C.

[0018] In one embodiment of the present invention, the polyethylene fabric has a thickness of 100,000 m 2 The number of fluffs generated per unit may be 10 or less.

[0019] In one embodiment of the present invention, the polyethylene fabric has an areal density of 150 to 800 g / m 2 It is possible.

[0020] The cooling product according to the present invention is made from the above-mentioned fabric. [Effects of the Invention]

[0021] The polyethylene yarn according to the present invention has excellent thermal conductivity, and at the same time, it has improved weaving properties, and can be used to produce fabrics with an appropriate cooling property and a very low incidence of fluffing.

[0022] In addition, the functional fabric according to the present invention contains polyethylene yarn having excellent thermal conductivity and high weavability, so that it has a cooling sensation and at the same time has excellent quality with few defects such as fluff.

[0023] Furthermore, the functional fabric according to the present invention not only provides a cooling sensation but also has excellent drapeability, so that when a user wears a product made from such a fabric, the contact area between the user and the product is large, thereby providing a substantially more excellent cooling sensation effect. [Brief explanation of the drawings]

[0024] [Figure 1] 1 is a schematic diagram illustrating a polyethylene yarn production apparatus according to one embodiment of the present invention. [Figure 2] FIG. 1 is a schematic diagram showing an apparatus for measuring the cool-to-the-touch feel of fabric. [Figure 3] FIG. 1 is a schematic diagram showing an apparatus for measuring the thermal conductivity of a fabric in the thickness direction. [Figure 4] 1 is a graph showing the weight distribution of the raw yarn according to Example 3 through GPC analysis. DETAILED DESCRIPTION OF THE INVENTION

[0025] Unless otherwise defined, the technical and scientific terms used in this specification have the meanings that are commonly understood by a person of ordinary skill in the art to which this invention belongs, and in the following description and accompanying drawings, descriptions of known functions and configurations that may unnecessarily obscure the gist of the present invention will be omitted.

[0026] Also, as used herein, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.

[0027] Furthermore, units used in this specification without any special mention are based on weight, and for example, the units of % or ratio mean % by weight or weight ratio, and unless otherwise defined, % by weight means the weight % of any one component in a total composition.

[0028] Furthermore, the numerical ranges used herein include lower and upper limits, and all values ​​within the range, increments logically derived from the form and width of the defined range, all doubly limited values, and all possible combinations of upper and lower limits of numerical ranges limited in different forms. Unless otherwise specified in the specification of the present invention, values ​​outside the numerical range that may occur due to experimental error or rounding of values ​​are also included in the defined numerical range.

[0029] As used herein, the term 'comprising' is an open-ended term having the same meaning as terms such as 'comprising,' 'containing,' 'having,' or 'characterized by,' and does not exclude additional, unrecited elements, materials, or steps.

[0030] Conventional high-molecular-weight polyethylene fibers are manufactured into yarns by maximizing the degree of crystallinity and orientation to achieve a cooling sensation, resulting in high yarn strength but low elongation, which reduces weaving properties. Furthermore, the resulting yarns have poor twist strength, further reducing weaving properties, and the resulting fabrics have poor drapeability and wearability. Therefore, when worn by a user, the contact area between the user and the fabric is not large, resulting in a lack of a substantial cooling sensation felt by the user.

[0031] Therefore, the present applicant has conducted extensive research to develop a polyethylene fiber that has excellent weaving properties while maintaining cooling properties. As a result, the applicant has discovered that polyethylene fiber having a specific polydispersity index, strength, and elongation has appropriate thermal conductivity, excellent weaving properties, and can be manufactured into fabrics with excellent physical properties. As a result of further in-depth research into this, the present invention has been completed.

[0032] In this specification, polyethylene raw yarn refers to monofilament or multifilament manufactured from polyethylene chips through processes such as spinning and drawing. For example, the polyethylene fiber may include 40 to 500 filaments, each having a fineness of 1 to 3 denier, and may have a total fineness of 100 to 1,000 denier.

[0033] The polyethylene raw yarn of the present invention has a polydispersity index (PDI) of 5 or more and 20 or less, a strength of 1.5 to 10 g / d as measured by ASTM D2256, and an elongation at maximum strength of 10 to 50%. It also has excellent thermal conductivity and improved weaving properties, and can be used to produce fabrics with appropriate cooling properties and very low pilling frequency.

[0034] The cooling sensation of fabrics containing polyethylene yarns according to the present invention is a characteristic that allows users wearing the fabric to feel an appropriate cooling sensation, i.e., a cooling feeling, due to the high thermal conductivity of the yarns. Specifically, in the case of polymers, heat is transferred within the polymer (particularly in the direction of molecular chains connected through covalent bonds) primarily through lattice vibrations called phonons. In other words, the thermal conductivity of yarns can be adjusted to differ depending on the structural characteristics of the polymer itself, such as the degree of crystallinity and orientation of the yarns, even for yarns made from the same resin.

[0035] As described above, raw yarns having a polydispersity index (PDI) of 5 or more and 20 or less, a tenacity of 1.5 to 10 g / d as measured by ASTM D2256, and an elongation at maximum tenacity of 10 to 50% have excellent thermal conductivity, high flexibility, and can be woven easily, and can therefore be manufactured into fabrics with excellent cooling properties and low pilling frequency.

[0036] Specifically, the polydispersity index may be 7 to 20, or 11 to 16, and more specifically, 12 to 15. Here, the strength measured by ASTM D2256 may be 5 to 10 g / d, or 6 to 9 g / d, and more specifically, 7 to 8 g / d, and the elongation at maximum strength may be, but is not limited to, 10 to 30%, or 15 to 25%, and more specifically, 17 to 23%. However, within the above ranges, the fiber can have high thermal conductivity and an appropriate high twist degree that is advantageous for weaving.

[0037] In particular, polyethylene raw yarn can be manufactured into a fabric with excellent thermal conductivity and very low fuzzing frequency when it satisfies the following formula 1 in a weight distribution graph obtained through gel permeation chromatography (GPC) analysis, where the log scale of molecular weight (Mw) is the x-axis and the weight distribution (dw / dlogM) is the y-axis. Here, the weight distribution graph is unimodal.

[0038] [Formula 1] (Mw max -Mw aver )<(Mw aver -Mw min )

[0039] (In the above formula, Mw aver is the molecular weight having the maximum weight distribution in the weight distribution graph, and Mw max and Mw min is Mw aver For the weight distribution value Q at 0.25Q in the weight distribution graph, Mw maw The maximum of the two molecular weights is Mw min means the minimum value.)

[0040] Polyethylene yarns satisfying the above formula 1 have a relatively low molecular weight and a wide weight distribution. Such polyethylene yarns have excellent thermal conductivity due to phonons, and can also have high flexibility and strength, which allows them to be produced into cool-feeling fabrics with excellent weaving properties and very low pilling frequency.

[0041] Furthermore, by satisfying the above formula 1, (Mw max -Mw aver )-(Mw aver -Mw min The value of ( ) may be a negative number. As an example, but not limited to, it may be greater than 0 and less than -3, specifically greater than 0 and less than -1, and more specifically greater than 0 and less than -0.5.

[0042] Gel permeation chromatography analysis was carried out by completely dissolving the polyethylene yarn in the following solvent and then measuring using the following analytical equipment.

[0043] -Analytical equipment: Tosoh HLC-8321 GPC / HT -Column: PLgel guard (7.5 x 50 mm) + 2 x PLgel mixed-B (7.5 x 300 mm) -Column temperature: 160℃ Solvent: Trichlorobenzene (TCB) + 0.04 wt.% dibutylhydroxytoluene (BHT) (after drying with 0.1% CaCl2) - Injector and detector temperature: 160℃ -Detector: RI Detector -Flow rate: 1.0ml / min -Injection volume: 300mL -Sample concentration: 1.5mg / mL -Standard sample: polystyrene

[0044] Furthermore, the polyethylene yarn has a lower initial modulus than typical cooling polyethylene yarns; that is, the initial modulus measured according to ASTM D2256 may be 50 to 100 g / d, specifically 30 to 80 g / d. If the initial modulus of the polyethylene yarn is higher than this range, the elasticity is good but the stiffness may be poor. If the initial modulus of the polyethylene yarn is lower than this range, the stiffness is good but the elastic recovery force is low, resulting in poor fabric toughness. That is, by having appropriate stiffness and toughness within this range, the fabric can be made with better weaving properties and therefore with excellent drapeability.

[0045] In one embodiment, the polyethylene yarn may have a weight-average molecular weight of 20,000 to 200,000 g / mol, preferably 30,000 to 150,000 g / mol. Within this range, the flowability of the molten material during melt extrusion of the yarn is good, thermal decomposition is prevented, and processability is ensured without yarn breakage during drawing. This allows the production of yarn with uniform physical properties, and fabrics with excellent durability can be provided.

[0046] In addition, polyethylene yarn has a density of 0.93 to 0.97 g / cm 3The crystallinity of the polyethylene yarn can be 50-90%, specifically 60-85%, after spinning. The crystallinity of the polyethylene yarn can be determined along with the size of the crystallites through a crystallinity analysis using an X-ray diffraction analyzer. As mentioned above, when the crystallinity satisfies the above range, heat is rapidly diffused and dissipated in the direction of the molecular chains connected through covalent bonds of the high-density polyethylene (HDPE) through lattice vibrations called 'phonons', improving the ability to expel moisture such as sweat and breath, thereby providing a fabric with excellent wearability.

[0047] A method for producing a polyethylene yarn according to one embodiment of the present invention will now be described in detail with reference to Figure 1. The polyethylene yarn of the present invention is not limited to any particular production method as long as it satisfies the above-mentioned ranges of physical properties such as PDI, strength, and elongation at maximum strength, and the following describes only one embodiment.

[0048] First, polyethylene in the form of chips is put into an extruder 100 and melted to obtain a polyethylene melt.

[0049] Molten polyethylene is transported through a die 200 by a screw (not shown) in the extruder 100 and extruded through a number of holes formed in the die 200. The number of holes in the die 200 can be determined depending on the DPF (Denier Per Filament) and fineness of the yarn to be produced. For example, when producing a yarn having a total fineness of 75 denier, the die 200 may have 20 to 75 holes, and when producing a yarn having a total fineness of 450 denier, the die 200 may have 90 to 450 holes, preferably 100 to 400 holes.

[0050] The melting process in the extruder 100 and the extrusion process through the die 200 can be changed and applied depending on the melt index of the polyethylene chips, but specifically, for example, they are preferably performed at 150 to 315°C, preferably 250 to 315°C, and more preferably 265 to 310°C. That is, the extruder 100 and the die 200 are preferably maintained at 150 to 315°C, preferably 250 to 315°C, and more preferably 265 to 310°C.

[0051] If the spinning temperature is less than 150°C, the polyethylene may not be uniformly melted, making spinning difficult. On the other hand, if the spinning temperature exceeds 315°C, the polyethylene may be thermally decomposed, making it difficult to achieve the desired strength.

[0052] The ratio L / D, which is the ratio of the hole length L to the hole diameter D of the spinneret 200, may be 3 to 40. If L / D is less than 3, die swell may occur during melt extrusion, making it difficult to control the elastic behavior of the polyethylene, resulting in poor spinnability. If L / D exceeds 40, thread breakage may occur due to necking of the molten polyethylene passing through the spinneret 200, as well as uneven extrusion due to a drop in pressure.

[0053] As the molten polyethylene is extruded from the holes of the spinneret 200, the difference between the spinning temperature and room temperature causes the polyethylene to begin to solidify, forming semi-solid filaments 11. In this specification, the term "filament" refers to not only semi-solid filaments but also completely solidified filaments.

[0054] The filaments 11 are completely solidified by being cooled in a cooling section (or "quenching zone") 300. The filaments 11 can be cooled by air cooling.

[0055] The cooling of the filaments 11 in the cooling unit 300 is preferably performed using cooling air at a speed of 0.2 to 1 m / sec to cool the filaments 11 to 15 to 40° C. If the cooling temperature is less than 15° C., the filaments 11 may be overcooled, resulting in insufficient elongation and possibly causing breakage during drawing, whereas if the cooling temperature exceeds 40° C., the filaments 11 may be solidified non-uniformly, resulting in a large deviation in fineness, resulting in breakage during drawing.

[0056] Furthermore, by performing multi-stage cooling in the cooling section, crystallization can be more uniform, which allows for smoother discharge of moisture and sweat and allows for the production of yarn with an excellent cooling sensation. More specifically, the cooling section can be divided into three or more sections. For example, when it has three cooling sections, it is preferable that the temperatures are designed to gradually decrease from the first cooling section to the second cooling section. Specifically, for example, the first cooling section can be set to 50 to 80°C, the second cooling section can be set to 30 to 50°C, and the third cooling section can be set to 15 to 30°C.

[0057] Furthermore, by setting the wind speed in the first cooling section to the highest, fibers with a smoother surface can be produced. Specifically, the first cooling section can use cooling air at a wind speed of 1.0 to 1.5 m / sec to cool to 50 to 80°C, the second cooling section can use cooling air at a wind speed of 0.6 to 1.0 m / sec to cool to 30 to 50°C, and the third cooling section can use cooling air at a wind speed of 0.3 to 0.6 m / sec to cool to 15 to 30°C. By adjusting the conditions in this way, raw yarn with a higher crystallinity and a smoother surface can be produced.

[0058] Next, the cooled and completely solidified filaments 11 are bundled by a bundler 400 to form a multifilament 10.

[0059] As illustrated in Figure 1, the polyethylene raw yarn of the present invention can be produced through a direct spin-draw (DSD) process. That is, the multifilament 10 is directly conveyed to a multi-stage drawing section 500 including a plurality of godet roller sections GR1...GRn, where it is multi-stage drawn at a total draw ratio of 2 to 20 times, preferably 3 to 15 times, and then wound on a winder 600. In addition, during the multi-stage drawing, a shrinkage drawing (relaxation) of 1 to 5% is imparted in the final drawing section, thereby providing a raw yarn with superior durability.

[0060] Alternatively, the polyethylene raw yarn of the present invention can be produced by first winding the multifilament 10 as an undrawn yarn and then drawing the undrawn yarn. That is, the polyethylene raw yarn of the present invention can be produced through a two-stage process in which polyethylene is melt-spun to produce an undrawn yarn, and then the undrawn yarn is drawn.

[0061] If the total draw ratio applied in the drawing process is less than 2, the final polyethylene yarn will not have a crystallinity of 60% or more, and there is a risk of fuzz (filling) being induced on the fabric produced from the yarn.

[0062] On the other hand, if the total draw ratio exceeds 15 times, yarn breakage may occur, the strength of the polyethylene yarn obtained may not be adequate, and the weavability of the polyethylene yarn may be poor. Furthermore, fabrics made using the polyethylene yarn may be too stiff, causing inconvenience to users.

[0063] Once the linear speed of the first godet roller unit GR1, which determines the spinning speed of the melt spinning of the present invention, is determined, the linear speeds of the remaining godet roller units are appropriately determined so that a total draw ratio of 2 to 20, preferably 3 to 15, is applied to the multifilament 10 in the multistage drawing unit 500.

[0064] According to one embodiment of the present invention, the temperatures of the godet roller units GR1...GRn of the multistage drawing unit 500 are appropriately set in the range of 40 to 140°C, thereby heat-setting the polyethylene yarn through the multistage drawing unit 500. Specifically, the multistage drawing unit may be composed of three or more, specifically, three to five, drawing sections. Furthermore, each drawing section may be composed of a plurality of godet roller units.

[0065] Specifically, for example, the multi-stage drawing section may comprise four drawing sections, in which the fiber is drawn to a total draw ratio of 2 to 15 times in the first to fourth drawing sections, and then contracted and drawn (relaxed) by 1 to 3% in the fifth drawing section. The total draw ratio refers to the final draw ratio of the fiber after passing through the first to third drawing sections, compared to the fiber before drawing.

[0066] More specifically, the first stretching section may be performed at 40 to 80°C, with a stretch ratio of 1.5 to 3. The second stretching section may be performed at a higher temperature than the first stretching section, specifically 80 to 130°C, with stretching being performed to a stretch ratio of 1.05 to 3. The third stretching section may be performed at 100 to 150°C, with stretching being performed to a stretch ratio of 1.05 to 3. The fourth stretching section may be performed at the same or lower temperature as the second stretching section, specifically 80 to 140°C, with 1 to 3% shrinkage and stretching (relaxation).

[0067] The multistage drawing section 500 simultaneously performs multistage drawing and heat setting of the multifilament 10, and the multistage drawn multifilament 10 is wound on a winder 600 to complete the polyethylene raw yarn of the present invention.

[0068] The functional fabric according to the present invention contains the polyethylene yarn described above, which has excellent thermal conductivity and high weavability, and thus has excellent quality with minimal defects such as fuzz. Furthermore, the functional fabric contains the polyethylene yarn described above, which not only provides a cooling sensation but also has excellent drapeability, so that when a user wears a product made from such a fabric, the contact area between the user and the product is large, thereby providing a substantially better cooling effect.

[0069] The functional fabric according to the present invention may be one that uses the polyethylene yarn described above alone, or may further contain a different type of yarn to further impart other functionality. However, from the viewpoint of simultaneously having a cool feeling and good weaving properties, it is preferable to use the polyethylene yarn alone.

[0070] Specifically, the functional fabric has a cooling sensation of 0.15 to 0.45 W / cm2 when measured by contacting a 30±2°C hot plate (T-box) with a 20±2°C fabric at 20±2°C and 65±2% RH. 2 When a 30±2°C heat source plate (BT-box) is brought into contact with a 20±2°C fabric, the thermal conductivity in the thickness direction at 20°C can be 0.01~0.30W / mK. More specifically, the cool feeling to the touch can be 0.18~0.30W / cm 2 The thermal conductivity in the thickness direction can be 0.05 to 0.2 W / mK. When this functional fabric with a cooling sensation is later manufactured or processed into a product and worn by a user, it can provide an appropriate cooling sensation that allows the user to feel comfortable in a high-temperature environment.

[0071] In addition, functional fabrics are available in 100,000m 2 The number of fluffs generated per yarn may be 10 or less, specifically 8 or less. That is, the functional fabric can be produced with high quality by including polyethylene yarn with improved weaving properties.

[0072] Functional fabrics are 150-800g / m 2 The fabric may be a woven or knitted fabric having a weight per unit area (i.e., areal density) of 150 g / m. 2 If the surface density of the fabric is less than 800 g / m, the fabric will not be dense enough and many voids will be present in the fabric, which will reduce the cooling sensation of the fabric. 2 If it exceeds this value, the excessively dense fabric structure will make the fabric stiff, causing problems with the feel felt by the user, and the high weight will cause problems in use.

[0073] Such fabrics can be processed into cooling products that require a suitable cooling sensation. The products can be any conventional textile products, but are preferably summer clothes, sportswear, masks, and workwear that provide a cooling sensation to the human body.

[0074] The cooling sensation product of the present invention is manufactured from the above-mentioned fabric and has a low twist of 5 gf or less, more preferably 2 to 5 gf, which allows it to have excellent drapeability and a comfortable fit. Furthermore, the excellent drapeability increases the contact area with the user's body when worn, allowing it to have a substantially better cooling sensation effect.

[0075] The present invention will be described in more detail with reference to the following examples, but the following examples are merely a reference for explaining the present invention in detail and are not intended to limit the scope of the present invention, which may be embodied in various forms.

[0076] Furthermore, unless otherwise defined, all technical and scientific terms have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terms used in the description of this application are merely for the purpose of effectively describing specific embodiments and are not intended to limit the present invention. Furthermore, the unit of additives not specifically described in the specification may be weight percent. [Example]

[0077] The physical properties were measured as follows.

[0078] [Measurement of yarn physical properties] <1. Weight distribution graph, weight average molecular weight (Mw) (g / mol), and polydispersity index (PDI)> The polyethylene yarn was completely dissolved in the following solvent, and then the weight distribution graph, weight average molecular weight (Mw), and polydispersity index (Mw / Mn: PDI) of the polyethylene yarn were determined using the following gel permeation chromatography (GPC).

[0079] -Analytical equipment: Tosoh HLC-8321 GPC / HT -Column: PLgel guard (7.5 x 50 mm) + 2 x PLgel mixed-B (7.5 x 300 mm) -Column temperature: 160℃ Solvent: Trichlorobenzene (TCB) + 0.04 wt.% dibutylhydroxytoluene (BHT) (after drying with 0.1% CaCl2) - Injector and detector temperature: 160℃ -Detector: RI Detector -Flow rate: 1.0ml / min -Injection volume: 300mL -Sample concentration: 1.5mg / mL -Standard sample: polystyrene

[0080] 2. Strength (g / d), initial modulus (g / d), and elongation (%) Deformation-stress curves of polyethylene yarns were obtained using a universal tensile tester manufactured by Instron Engineering Corp. (Canton, Mass.) according to the ASTM D2256 method. The sample length was 250 mm, the tensile speed was 300 mm / min, and the initial load was set at 0.05 g / d. The strength (g / d) and the elongation (%) at maximum strength were calculated from the stress and elongation at the break point. The initial modulus (g / d) was calculated from the tangent line giving the maximum slope near the origin of the curve. Five measurements were taken for each yarn, and the average value was calculated.

[0081] <3. Crystallinity> The crystallinity of the polyethylene yarn was measured using an XRD (X-ray Diffractometer) manufactured by PANalytical, model name: EMPYREAN. Specifically, the polyethylene yarn was cut to prepare a sample having a length of 2.5 cm, and the sample was fixed to a sample holder and then measured under the following conditions.

[0082] -Light source (X-ray Source): Cu-K α radiation -Power: 45KV x 25mA - Mode: Continuous scan mode -Scan angle range: 10~40° -Scanning speed: 0.1° / sec

[0083] [Measurement of fabric properties] <1. Cool sensation to the touch> The measurements were conducted at the Korea Clothing Testing and Research Institute using a KES-F7 (Thermo Labo II) device in a test environment of 20±2°C and 65±2% RH.

[0084] Specifically, a 20cm x 20cm fabric sample was prepared and left for 24 hours under conditions of 20±2°C temperature and 65±2% RH. The fabric's coolness to the touch (Q max) was then measured using a KES-F7 THERMO LABO II (Kato Tech Co., Ltd.) device in a test environment of 20±2°C temperature and 65±2% RH. Specifically, as illustrated in FIG. 2, the fabric sample 23 was placed on a base plate (also called a 'Water-Box') 21 maintained at 20°C, and a hot plate (T-Box) 22a (contact area: 3cm x 3cm) heated to 30°C was placed on the fabric sample 23 for only 1 second. That is, the other side of the fabric sample 23, which was in contact with the base plate 21, was momentarily brought into contact with the T-Box 22a. The contact pressure applied to the fabric sample 23 by the T-Box 22a was 6gf / cm. 2 The Qmax value displayed on a monitor (not shown) connected to the device was then recorded. This test was repeated 10 times, and the arithmetic mean of the Qmax values ​​was calculated.

[0085] <2. Thermal conductivity> A 20cm x 20cm dough sample was prepared and left for 24 hours under conditions of 20±2°C and 65±2% RH. The thermal conductivity and heat transfer coefficient of the dough were then measured using a KES-F7 THERMO LABO II (Kato Tech Co., Ltd.) device in a test environment of 20±2°C and 65±2% RH. Specifically, as illustrated in FIG. 3, the dough sample 23 was placed on a base plate 21 maintained at 20°C, and a heat source plate (BT-Box) 22b (contact area: 5cm x 5cm) at 30±2°C was placed on the dough sample 23 for 1 minute. Heat was continuously supplied to the BT-Box 22b while it was in contact with the dough sample 23, so that its temperature was maintained at 30°C. The amount of heat supplied to maintain the temperature of the BT-Box 22b (i.e., heat flow loss) was displayed on a monitor (not shown) connected to the device. This test was repeated five times, and the arithmetic mean of the heat flow loss was calculated. The thermal conductivity and heat transfer coefficient of the fabric were then calculated using the following Equations 2 and 3.

[0086] Equation 2: K = (W D) / (A ΔT) Equation 3: k=K / D

[0087] Here, K is the thermal conductivity (W / cm °C), D is the thickness of the fabric sample 23 (cm), and A is the contact area of ​​the BT-Box 22b (= 25 cm 2 ), ΔT is the temperature difference between the two sides of the fabric sample 23 (=10°C), W is the heat flow loss (Watt), and k is the heat transfer coefficient (W / cm 2 ·℃).

[0088] <3. Stiffness (gf)> After taking fabric samples (width: 60 mm, length: 60 mm), the bending resistance of the specimens was measured according to ASTM D885 / D885M-10a(2014) section 38. The measuring equipment was as follows.

[0089] (i) CRE-type Tensile Testing Machine (model: INSTRON3343) (ii) Loading Cell, 2 KN (200 kgf) (iii) Specimen Holder: A specimen holder as defined in section 38.4.3. (iv) Specimen Depressor: A specimen depressor as defined in section 38.4.4.

[0090] Specifically, the sample was placed in the center of the specimen holder so that it was directly supported by the specimen holder. The sample maintained a flat state without bending. At this time, the distance between the specimen supporting part of the specimen holder and the depressing part of the specimen depressor was 5 mm. Next, while the specimen depressor was left in place, the specimen holder was raised to 15 mm and the maximum strength was measured.

[0091] [Example 1] <Production of polyethylene yarn> Using the apparatus illustrated in FIG. 1, a polyethylene yarn containing 200 filaments and having a total fineness of 150 denier was produced.

[0092] Specifically, polyethylene chips were introduced into an extruder 100 and melted. The melted polyethylene was extruded through a die 200 having 200 holes. The ratio of the hole length L to the hole diameter D of the die 200, L / D, was 6. The die temperature was 270°C.

[0093] The filaments 11 formed while being discharged from the nozzle holes of the spinneret 200 were sequentially cooled in a cooling section 300 consisting of three sections. In the first cooling section, the filaments were cooled to 70°C using cooling air at a speed of 1.2 m / sec, in the second cooling section, they were cooled to 40°C using cooling air at a speed of 0.8 m / sec, and in the third cooling section, they were finally cooled to 20°C using cooling air at a speed of 0.4 m / sec. After being cooled, the filaments were bundled into a multifilament yarn 10 by a bundler 400.

[0094] The multifilament yarn was then transferred to the drawing unit 500. The drawing unit was a multi-stage drawing unit consisting of four zones, and specifically, in the first drawing zone, the yarn was drawn at a maximum drawing temperature of 70°C to a total draw ratio of 1.5 times, in the second drawing zone, the yarn was drawn at a maximum drawing temperature of 100°C to a total draw ratio of 2.0 times, in the third drawing zone, the yarn was drawn at a maximum drawing temperature of 120°C to a total draw ratio of 1.5 times, and in the fourth drawing zone, the yarn was drawn and heat-set at a maximum drawing temperature of 125°C to achieve a 2% shrinkage (relaxation) compared to the third drawing zone.

[0095] The drawn multifilament yarn was then wound on a winder 600. The winding tension was 0.8 g / d.

[0096] The physical properties of the produced yarn were measured and are shown in Table 1 below.

[0097] <Manufacturing of functional fabrics> The polyethylene yarn thus produced was woven to a surface density of 500 g / m 2 The physical properties of the functional fabric were measured and are shown in Table 3 below.

[0098] [Examples 2 to 7] Fabrics were manufactured in the same manner as in Example 1, except that the raw yarn conditions were changed as shown in Table 1 below. In addition, the physical properties of the fabrics manufactured in the same manner as in Example 1 were measured and are shown in Table 3 below.

[0099] [Comparative Examples 1 to 4] Fabrics were manufactured in the same manner as in Example 1, except that the raw yarn conditions were changed as shown in Table 2 below. In addition, the physical properties of the fabrics manufactured in the same manner as in Example 1 were measured and are shown in Table 4 below.

[0100] [Table 1]

[0101] [Table 2]

[0102] [Table 3]

[0103] [Table 4]

[0104] Referring to Tables 1 to 4 above, it can be seen that the fabrics according to the examples have a suitable cooling sensation, excellent stiffness and drapeability, and have an extremely low incidence of fuzz during fabric production, making them excellent in weaving properties. In particular, referring to Figure 4, which shows the weight distribution graph through GPC analysis of Example 3, in the examples that satisfy the above formula 1, that is, (Mw max -Mw aver )-(Mw aver -Mw min It was confirmed that the examples in which the value of (x) was a negative number had even better weaving properties and cool sensation.

[0105] As described above, the present invention has been described using specific details and limited examples and drawings, but these are provided merely to assist in a more general understanding of the present invention, and the present invention is not limited to the above examples. Those skilled in the art will appreciate that various modifications and variations can be made from such descriptions.

[0106] Therefore, the concept of the present invention should not be limited to the described embodiments, and all things that are equivalent to or have equivalent variations within the scope of the claims, as well as the scope of the claims, should be considered to fall within the scope of the concept of the present invention. [Explanation of symbols]

[0107] 100: Extruder 200: nozzle 300: Cooling section 400:Focusing part 500: Stretching part 600: Winder

Claims

1. a polydispersity index (PDI) of 5 or more and 20 or less, a strength measured by ASTM D2256 of 1.5 to 10 g / d, and an elongation at maximum strength of 10 to 50%, A weight distribution graph obtained by gel permeation chromatography (GPC) analysis, in which the log scale of molecular weight (Mw) is on the x-axis and the weight distribution (dw / dLogM) is on the y-axis, satisfies the following formula 1, and the weight distribution graph is unimodal. [Formula 1] (Mw max - Mw aver ) < (Mw aver - Mw min ) (In the above formula, Mw aver is the molecular weight having the maximum weight distribution in the weight distribution graph, Mw max and Mw min are two molecular weights corresponding to 0.25Q in the weight distribution graph, where Q is the weight distribution degree value at Mw aver, Mw max is the maximum value of the two molecular weights, and Mw min is the minimum value.)

2. 2. The polyethylene yarn according to claim 1, wherein the yarn has an initial modulus of 30 to 80 g / d as measured in accordance with ASTM 2256.

3. The polyethylene yarn according to claim 1, wherein the yarn has a crystallinity of 60 to 85%.

4. The raw yarn has a density of 0.93 to 0.97 g / cm ３ The polyethylene fiber according to claim 1,

5. The polyethylene yarn according to claim 1, wherein the yarn has a weight average molecular weight of 90,000 to 400,000 g / mol.

6. A functional fabric comprising the polyethylene yarn according to any one of claims 1 to 2 and 5.

7. The fabric has a cooling sensation of 0.15 to 0.30 W / cm when measured at 20±2°C and 65±2% RH by contacting a 30±2°C hot plate (T-box) with the fabric at 20±2°C. ２ The functional fabric according to claim 6,

8. The fabric has a thickness-wise thermal conductivity of 0.05 to 0.20 W / mK, measured at 20±2°C and 65±2% RH by contacting a heat source plate (BT-box) at 30±2°C with the fabric at 20±2°C. The functional fabric according to claim 6.

9. The fabric has a surface density of 150 to 800 g / m ２ The functional fabric according to claim 6,

10. A cooling product made from the fabric of claim 6.

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