Dyed polyethylene yarn and functional fabric containing the same

Abstract

The present invention relates to a dyed polyethylene yarn and a functional fabric containing the same, and more specifically to a dyed polyethylene yarn having excellent color uniformity and a functional fabric containing the same. In the dyed polyethylene yarn containing a pigment according to the present invention, the L*, a*, and b* measured under the following measurement conditions satisfy the following formula. [Measurement conditions] The dyed polyethylene yarn is wound around a flat substrate to form a measurement area, and CCM (Computer Color Matching) measurement is performed on the measurement area. CCM measurement is performed every time the dyed polyethylene yarn is wound around the substrate 70 times, and measurements are performed at least n times (n is a natural number of 50 or more) [Formula] (C max -C min ) / C aver ×100≦15(C max , C min , and C aver (means the maximum, minimum, and average value for any one selected from L*, a*, and b*, respectively.)

Description

[Technical Field]

[0001] The present invention relates to a spun-dyed polyethylene yarn and a functional fabric containing the same, and more particularly to a spun-dyed polyethylene yarn having excellent color uniformity and a functional fabric containing the same. [Background technology]

[0002] High density polyethylene (HDPE) yarn is 0.94g / cm 3 High-density polyethylene yarn refers to a high-strength polyethylene yarn having a density equal to or higher than that. High-density polyethylene yarn is used as a variety of materials that require high strength, such as sports ropes, fishing lines, protective clothing, bulletproof clothing, and stab-proof clothing, and is also used in a variety of composite materials that require ultra-high strength.

[0003] In addition, high-density polyethylene yarn has high thermal conductivity due to lattice vibrations called phonons, and has excellent lightweight properties, with a specific gravity of approximately 0.93, making it light enough to float on water.

[0004] Therefore, it is used in a variety of applications, including not only textile products that require high strength, such as the aforementioned sports ropes, fishing lines, protective clothing, bulletproof clothing, and stab-resistant clothing, but also summer clothing, work clothing, and sportswear that require a cool sensation.

[0005] However, high density polyethylene yarn is known as a dye-resistant fiber because it is almost impossible to dye with any dye in a dyeing system due to its hydrophobicity caused by high crystallinity.

[0006] Currently, there are two methods for dyeing such high-density polyethylene yarn: one is a dyeing method in which a pigment is added during spinning, and the other is a polymer blending technique in which other polymers that can be dyed are mixed.

[0007] However, the dyed polyethylene yarn produced by the polymer blending technique has the disadvantage that it is difficult to maintain the physical properties unique to high-density polyethylene yarn, such as high thermal conductivity and light weight, as polymers with physical properties other than polyethylene are mixed in.

[0008] Therefore, conventionally, a dyed polyethylene yarn was used, which was manufactured by a dyeing method in which a masterbatch chip containing a pigment was melt-spun, as disclosed in Korean Patent Registration No. 10-1992444, 'Method for manufacturing dyed polyethylene multifilament false-twisted yarn'.

[0009] However, such conventional spun-dyed polyethylene yarns have the disadvantage that it is difficult to uniformly mix the pigment into polyethylene, which has a relatively high viscosity, resulting in serious color non-uniformity of the yarn due to uneven mixing between the pigment and the polyethylene raw material. Therefore, not only does the unevenness of the spun-dyed yarn itself reduce quality, but as a large amount of pigment is added to achieve the desired color, the physical properties of the yarn, such as strength, also decrease. Furthermore, there is a disadvantage that the quality of the final products manufactured from the yarn also decreases. Summary of the Invention [Problem to be solved by the invention]

[0010] An object of the present invention is to provide a spun-dyed polyethylene yarn having excellent color uniformity and a functional fabric containing the same. [Means for solving the problem]

[0011] The spun-dyed polyethylene yarn according to the present invention, which is a pigment-containing spun-dyed polyethylene yarn, satisfies the following formulas for L*, a*, and b* measured under the following measurement conditions:

[0012] [Measurement conditions] The spun-dyed polyethylene yarn is wound around a flat substrate to form a measurement area, and a CCM (Computer Color Matching) measurement is performed on the measurement area. The CCM measurement is performed every 70 times when the spun-dyed polyethylene yarn is wound around the substrate, and the measurement is performed at least n times (n is a natural number of 50 or more).

[0013] [formula] (C max -C min ) / C aver ×100≦15

[0014] (C max , C min , and C aver means the maximum, minimum, and average value of any one selected from L*, a*, and b*, respectively.

[0015] In the spun-dyed polyethylene yarn according to one embodiment of the present invention, the standard deviation of the L* value may be 3 or less when the yarn is measured by CCM.

[0016] The dyed polyethylene yarn according to one embodiment of the present invention may contain 0.00005 to 1 wt % of the pigment based on the total weight of the dyed polyethylene yarn.

[0017] In the spun-dyed polyethylene yarn according to one embodiment of the present invention, the degree of crystallinity of the yarn may be 60 to 80%.

[0018] In the spun-dyed polyethylene yarn according to one embodiment of the present invention, the yarn may have an initial modulus of 10 to 300 cN / dtex and a tenacity of 1.5 to 20 g / d, as measured by ASTM D2256.

[0019] In the spun-dyed polyethylene yarn according to one embodiment of the present invention, the yarn may have a melt index (MI, @190°C) measured according to ASTM D1238 of 0.5 to 22 g / 10 min.

[0020] In the spun-dyed polyethylene yarn according to one embodiment of the present invention, the yarn may have a dry heat shrinkage (@100°C) according to ASTM D4974-04 of 2 to 15%.

[0021] The functional fabric according to the present invention is produced from the above-mentioned dyed polyethylene yarn.

[0022] In one embodiment of the functional fabric according to the present invention, the fabric has a cooling sensation of 0.1 to 0.3 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 may be.

[0023] In the functional fabric according to one embodiment of the present invention, the fabric may have a thermal conductivity of 0.05 to 0.25 W / mK in the thickness direction, measured at 2.0±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. [Effects of the Invention]

[0024] The polyethylene yarn according to the present invention has excellent color uniformity and therefore has excellent coloring properties compared to the amount of pigment added.

[0025] Furthermore, the polyethylene yarn according to the present invention can maintain the excellent thermal conductivity inherent to high density polyethylene even when pigments are added, making it possible to manufacture fabrics with excellent cooling properties.

[0026] In addition, the functional fabric according to the present invention contains polyethylene yarn having excellent color uniformity and excellent thermal conductivity, so that it can have excellent color development and color uniformity while also exhibiting cooling properties. [Brief explanation of the drawings]

[0027] [Figure 1]1 is a schematic diagram showing a process for producing a yarn according to an embodiment of the present invention. FIG. [Figure 2] 1 is a photograph of an apparatus for measuring CCM (Computer Color Matching) of a functional fabric according to an embodiment of the present invention. [Figure 3] 1 is a schematic diagram illustrating an apparatus for measuring the cool touch feeling of a functional fabric according to one embodiment of the present invention. [Figure 4] 1 is a schematic diagram illustrating an apparatus for measuring the thermal conductivity in the thickness direction of a functional fabric according to one embodiment of the present invention. [Figure 5] 1 shows the CCM measurement results of a yarn according to one embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0028] 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.

[0029] Also, as used herein, the singular forms "a," "an," and "the" can be intended to include the plural forms as well, unless the context clearly indicates otherwise.

[0030] Furthermore, units used in this specification without any special mention are based on weight, and for example, the units % or ratio mean % by weight or weight ratio, and % by weight means the weight % of any one component in a total composition unless otherwise defined.

[0031] Furthermore, the numerical ranges used herein include the lower limit, the upper limit, all values ​​within the range, increments logically derived in the form and width of the defined range, all values ​​limited therein, 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.

[0032] As used herein, the term 'comprising' is an open-ended term having the same meaning as terms such as 'comprising,' 'containing,' 'having,' or 'featuring,' and does not exclude additional, unrecited elements, materials, or steps.

[0033] Conventional spun-dyed polyethylene yarns have the problem that it is difficult to uniformly mix a pigment into polyethylene, which has a relatively high viscosity, resulting in serious yarn color non-uniformity due to non-uniform mixing between the pigment and polyethylene raw material. Therefore, not only does the non-uniformity of the spun-dyed yarn itself reduce quality, but as a large amount of pigment is added to achieve the desired color, the yarn's physical properties, such as strength, also deteriorate. Furthermore, the quality of the final products manufactured from the yarn also deteriorates.

[0034] Therefore, the present applicant has conducted extensive research for a long period of time to develop a polyethylene fiber that maintains the physical properties but has excellent color uniformity. As a result, the applicant has developed a new dyed polyethylene fiber that has excellent color uniformity by increasing the degree of mixing between the pigment and polyethylene yarn raw materials.

[0035] Specifically, the spun-dyed polyethylene yarn according to the present invention is a spun-dyed polyethylene yarn containing a pigment, and satisfies the following formulas for L*, a*, and b* measured under the following measurement conditions:

[0036] [Measurement conditions] The spun-dyed polyethylene yarn is wound around a planar substrate to form a measurement area, and CCM (Computer Color Matching) measurement is performed on the measurement area. The CCM measurement is performed every 70 times when the spun-dyed polyethylene yarn is wound around the substrate, and the measurement is performed at least n times (n is a natural number of 50 or more).

[0037] [formula] (C max -C min ) / C aver ×100≦15

[0038] (C max , C min , and C aver means the maximum, minimum, and average value of any one selected from L*, a*, and b*, respectively.

[0039] Specifically, in the above formula, (C max -C min ) / C aver ×100 may be 10 or less, specifically 0.1 to 8, and more specifically 3 to 7. Such spun-dyed polyethylene yarn has excellent color uniformity, and therefore can have excellent coloring properties compared to the amount of pigment added. Furthermore, despite the small amount of pigment added, the excellent coloring properties allow the excellent thermal conductivity inherent to high-density polyethylene to be maintained, making it possible to produce fabrics with excellent cooling properties.

[0040] Specifically, a dyed polyethylene yarn is wound around a planar substrate, thereby forming an area on the substrate covered with the dyed polyethylene, that is, a measurement area.

[0041] In this case, when the yarn is wound around the substrate, the dyed polyethylene yarn wound for the n-1th time (n is a natural number of 2 or more) and the dyed polyethylene yarn wound for the nth time may come into contact with each other so as to proceed in either direction around the substrate.

[0042] Such a measurement area is formed by covering the spun-dyed polyethylene fiber yarn on the substrate, so that the spun-dyed polyethylene fiber yarn exhibits a color similar to that of the spun-dyed polyethylene fiber yarn when manufactured into fabric. The measurement area is not limited as long as it is an area that allows CCM measurement. However, the area that the measurement area occupies on the substrate can be appropriately adjusted depending on the size of the substrate, the thickness of the spun-dyed polyethylene yarn, and the number of times it is wound. As a non-limiting example, the measurement area can be formed by winding spun-dyed polyethylene yarn having a thickness of 410 Degrees (Degree) 30 times or more, specifically 40 to 100 times, and more specifically 50 to 90 times, around a square plate-shaped substrate having a width of 6.5 cm, a length of 6.5 cm, and a height of 0.5 cm.

[0043] After measuring the n-1th CCM (n is a natural number greater than or equal to 2) through the measurement area formed by the above-mentioned method, when measuring the nth CCM, a measurement area for measuring the nth CCM can be formed on the measurement area formed for measuring the n-1th CCM.

[0044] In the following description, it is assumed that the measurement region formed first is the first measurement region, and the measurement region formed thereafter is the second measurement region.

[0045] After performing CCM measurement on a first measurement area formed by winding the spun-dyed polyethylene yarn 70 times in one direction around the substrate, CCM measurement was performed on a second measurement area formed by winding the spun-dyed polyethylene yarn again around the first measurement area. That is, the second measurement area was formed by winding the spun-dyed polyethylene yarn so as to cover the first measurement area while changing the direction of travel in the opposite direction to the one direction of the substrate.

[0046] Therefore, the second measurement area where the n-th CCM is measured is the same size as the first measurement area where the n-1th CCM is measured, and the thickness of the measurement area on the substrate increases by the thickness of the spun-dyed polyethylene yarn when the second measurement area is formed on the first measurement area. The positions where the CCM is measured in the first measurement area and the second measurement area may be the same.

[0047] The L*, a*, and b* of the CCM measured through such a measurement area can satisfy the above equations.

[0048] Specifically, the dyed polyethylene yarn may contain, but is not limited to, 0.0001 to 0.5 wt %, more specifically 0.002 to 0.05 wt %, and even more specifically 0.01 to 0.03 wt % of the pigment based on the total weight, but within this range, excellent color development and color uniformity can be achieved compared to the amount added.

[0049] Here, when measuring the CCM of the raw yarn, the standard deviation of the L* value is 3 or less, specifically 2 or less, more specifically 1.5 or less, and the yarn may have excellent color uniformity that is not easily distinguishable with the naked eye.

[0050] In the present invention, the pigment is not limited as long as it is a pigment or raw material known to be used in the dyeing of polyethylene. As a specific example, when the polyethylene yarn is black, the pigment may be carbon black particles.

[0051] The spun-dyed polyethylene yarn may have an initial modulus, as measured by ASTM D2256, of 10 to 300 cN / dtex, specifically 50 to 300 cN / dtex, and more specifically 70 to 150 cN / dtex. The tenacity, as measured by ASTM D2256, may be, but is not limited to, 1.5 to 20 g / d, specifically 4 to 20 g / d, and more specifically 10 to 15 g / d. However, within this range, the yarn may have high thermal conductivity and an appropriate high twist degree that is advantageous for weaving.

[0052] The spun-dyed polyethylene yarn may have a polydispersity index of 5 to 20, more specifically 7 to 15, and the weight-average molecular weight of the spun-dyed polyethylene yarn may be 45,000 to 300,000 g / mol, preferably 100,000 to 200,000 g / mol. Within this range, the flowability of the molten material during melt extrusion of the yarn is good, thermal decomposition is prevented, and yarn breakage during drawing is prevented. This ensures processability, making it possible to produce yarn with uniform physical properties and provide a fabric with excellent durability.

[0053] The spun-dyed polyethylene yarn may have a melt index (MI) at 190°C measured at 2.16 kg at 190°C according to ASTM D1238 of 0.5 to 22 g / 10 min, specifically 1 to 10 g / 10 min, and more specifically 2 to 8 g / 10 min. The spun-dyed polyethylene yarn may have a density of 0.93 to 0.97 g / cm. 3 Furthermore, the spun-dyed polyethylene yarn may have a crystallinity of 60-80%, specifically 65-75%, after spinning. The crystallinity of the polyethylene yarn can be determined along with the size of crystallites through crystallinity analysis using an X-ray diffraction analyzer. As described above, when the melt index, density, and crystallinity satisfy the above ranges, heat is rapidly diffused and dissipated through lattices called 'phonons' in the direction of the molecular chains connected through covalent bonds of high-density polyethylene (HDPE). This improves the ability to expel moisture such as sweat and breath, providing a fabric with an excellent cooling sensation.

[0054] The spun-dyed polyethylene yarn has a very low dry heat shrinkage (@100°C) of 2 to 15%, specifically 2.7 to 5%, according to ASTM D4974-04, and therefore has excellent shape stability.

[0055] The spun-dyed polyethylene yarn of the present invention can be produced by a spun-dyeing method.

[0056] Specifically, the spun-dyed polyethylene yarn may be produced from a polyethylene resin composition containing a color masterbatch produced by: mixing a pigment with polyethylene in chip form, followed by drying to produce a primary master chip; and repeating the steps of melting the primary master chip, remixing it, and drying it n times (n is a natural number of 1 or greater) to produce an nth master chip. Here, n may be, but is not limited to, 2 to 5, specifically 2 to 3. By producing a resin composition by incorporating the color masterbatch produced by the above steps into a polyethylene resin, the spun-dyed polyethylene yarn may have better color uniformity.

[0057] The pigment content in the color masterbatch can be adjusted in various ways, but can be 0.05 to 10.0 wt %, specifically 0.1 to 5 wt %, based on the total weight of the color masterbatch. Within this range, the pigment content is lower than that of conventional color masterbatches, but the color masterbatch can still have excellent color development.

[0058] In addition, the polyethylene resin composition containing such a color masterbatch can be appropriately mixed with the color masterbatch according to the pigment content ratio in the raw yarn as described above. Specifically, the polyethylene resin composition can contain 0.1 to 10 wt % of the color masterbatch based on the total weight of the polyethylene resin composition.

[0059] The spun-dyed polyethylene yarn produced through this spun-dyeing method can have excellent color uniformity as described above, making it possible to provide high-quality fabrics.

[0060] Hereinafter, a method for producing spun-dyed polyethylene yarn according to one embodiment of the present invention will be described in detail with reference to FIG.

[0061] First, a pigment is mixed with polyethylene chips, and the dried primary master chips are melted and remixed to obtain a secondary master chip. The secondary master chips and polyethylene chips are then fed into an extruder 100 and melted to obtain a molten dyed polyethylene.

[0062] Molten polyethylene is conveyed 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.

[0063] The melting process in the extruder 100 and the extrusion process through the die 200 can be varied depending on the melt index of the polyethylene chips, but specifically, they are preferably carried out at, for example, 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 a temperature of 150 to 315°C, preferably 250 to 315°C, and more preferably 265 to 310°C.

[0064] If the spinning temperature is less than 150°C, the polyethylene may not be uniformly melted, making spinning difficult, whereas if the spinning temperature is more than 315°C, the polyethylene may be thermally decomposed, making it difficult to achieve the desired strength.

[0065] The ratio L / D 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 occurs during melt extrusion, making it difficult to control the elastic behavior of the polyethylene, resulting in poor spinnability. If L / D exceeds 40, the molten polyethylene passing through the spinneret 200 may experience thread breakage due to necking, as well as uneven extrusion due to a drop in pressure.

[0066] As the molten polyethylene is extruded from the holes of the spinneret 200, the polyethylene begins to solidify due to the difference between the spinning temperature and room temperature, forming semi-solid filaments 11. In this specification, both semi-solidified filaments and fully solidified filaments are collectively referred to as "filaments."

[0067] The plurality of 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.

[0068] In addition, by performing multi-stage cooling in the cooling section, crystallization can be carried out more uniformly, which allows for smoother discharge of moisture and sweat and allows for the production of yarn with excellent cooling sensation.

[0069] The cooled and completely solidified filaments 11 are then bundled by a bundler 400 to form a multifilament 10.

[0070] As illustrated in Figure 1, the polyethylene yarn of the present invention can be produced through a direct spin-draw (DSD) process. That is, the multifilament 10 is directly transferred 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, preferably 3 to 15, and then wound on a winder 600. In addition, during the multi-stage drawing, a shrinkage draw (relaxation) of 1 to 5% is imparted in the final drawing section, thereby providing a yarn with superior durability.

[0071] 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.

[0072] The functional fabric according to the present invention contains the above-mentioned dyed polyethylene yarn, which has excellent color uniformity and excellent thermal conductivity, and thus can have excellent color development and color uniformity while also exhibiting cooling properties.

[0073] The functional fabric according to the present invention may be one that uses the above-described spun-dyed polyethylene yarn alone, or may further contain a different type of yarn to further impart other functionality. However, from the viewpoint of simultaneously achieving a cool feeling and excellent color uniformity, it is preferable to use the above-described polyethylene yarn alone.

[0074] Specifically, the functional fabric has a cooling sensation of 0.1 to 0.3 W / cm2 when measured at 20±2°C and 65±2% RH by contacting a hot plate (T-box) heated to 30±2°C with the fabric at 20±2°C. 2The thermal conductivity in the thickness direction measured by contacting a heat source plate (BT-box) heated to 30±2°C with the fabric at 20±2°C can be 0.05~0.25W / mK. More specifically, the cool feeling to the touch can be 0.15~0.22W / cm 2 The thermal conductivity can be 0.08~0.2W / 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 makes the user feel comfortable in a high temperature environment.

[0075] 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.

[0076] 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 realized in various forms.

[0077] 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]

[0078] The physical properties were measured as follows.

[0079] [Measurement of yarn physical properties] <1. CCM (Computer Color Matching) Measurement> As shown in Figure 2, a measurement area was formed by winding the yarn around a substrate measuring 6.5 cm wide, 6.5 cm long, and 0.5 cm high, and CCM (Computer Color Matching) measurements were performed on the measurement area every 70 (±10) turns of the dyed polyethylene yarn around the substrate. A total of 135 CCM measurements were performed.

[0080] CCM was measured using a color difference meter (KAE1-063, GNB TECH) to derive the L*, a*, and b* values ​​and the values ​​of the following formulas.

[0081] [formula] (C max -C min ) / C aver ×100

[0082] (C max , C min , and C aver (These mean the maximum, minimum, and average values ​​for any one selected from L*, a*, and b*, respectively.)

[0083] 2. 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 average molecular weight (Mw) and polydispersity index (Mw / Mn: PDI) of the polyethylene yarn were determined using the following gel permeation chromatography (GPC).

[0084] -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

[0085] <3. Strength (g / d), initial modulus (g / d)> Deformation-stress curves for polyethylene yarns were obtained using a universal tensile tester manufactured by Instron Engineering Corp. (Canton, Mass.) according to ASTM D2256. 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) was calculated from the stress and elongation at the break point, and the initial modulus (g / d) was calculated from the tangent line that gave the maximum slope near the origin of the curve. Five measurements were taken for each yarn, and the average value was calculated.

[0086] <4. Crystallinity> The crystallinity of the polyethylene yarn was measured using an X-ray Diffractometer (XRD) [manufacturer: 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.

[0087] -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

[0088] <5. Strength (kgf), elongation at break (%)> The strength at break of a raw yarn sample was measured using an Instron testing machine (Instro Engineering Corp., Canton, Mass.) according to ASTM D-885 test method, while applying a pulling speed of 300 m / min to a 250 mm sample.

[0089] <6. Dry heat shrinkage rate> According to the method of ASTM D4974-04, using a dry heat shrinkage measuring device (manufacturer: TESTRITE, model name: MK-V), the initial length (L1) of the sample under a load of 0.2 g / d and the length (L2) of the sample after 2 minutes under a load of 0.2 g / d at 100°C were measured. Then, the dry heat shrinkage (%) of the raw yarn was calculated according to the following equation 2.

[0090] [Formula 2] Dry heat shrinkage rate (%)=[(L1-L2) / L1]×100

[0091] <7. Melting Index> The melt index (MI) at 190°C and 2.16 kg was measured according to ASTM D1238.

[0092] [Measurement of fabric properties] <1. Cool sensation to the touch> The measurements were conducted at the request of 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.

[0093] 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 Figure 3, the fabric sample 23 was placed on a base plate (also called a 'Water-Box') 21 maintained at 20±2°C, and a hot plate (T-Box) 22a (contact area: 3cm x 3cm) heated to 30±2°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.

[0094] <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. 4, the dough sample 23 was placed on a base plate 21 maintained at 20°C±2°C, and a heat source plate (BT-Box) 22b (contact area: 5cm x 5cm) at 30°C±2°C was placed on the dough sample 23 for one 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±2°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 3 and 4.

[0095] [Formula 3] K=(W D) / (A ΔT)

[0096] [Formula 4] k=K / D

[0097] 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 surfaces of the fabric sample 23 (=10°C), W is the heat flow loss (Watt), and k is the heat transfer coefficient (W / cm 2 ·℃).

[0098] [Example 1] <Production of color master batches> After mixing the pigment into polyethylene chips, the dried primary master chips were melted and mixed again to obtain the secondary master chips, i.e., color master batches, in which 0.83 wt% of the pigment was mixed based on the total weight of the color master chips.

[0099] <Production of polyethylene yarn> A dyed polyethylene yarn having a total fineness of 410 denier was produced.

[0100] Specifically, polyethylene chips with a weight-average molecular weight (Mw) of 154,604 g / mol and secondary master chips were placed in an extruder and melted to form a melt. The secondary master chips were mixed at 3 wt% of the total weight of the melt. The melt was extruded through a die with 200 holes. The ratio of the hole length (L) to the hole diameter (D) of the die, L / D, was 6. The die temperature was 270°C.

[0101] The filaments formed while being extruded from the nozzle holes of the spinneret were cooled, bundled, and then drawn. The drawn multifilament yarn was then wound on a winder. The winding tension was 0.8 g / d.

[0102] The physical properties of the produced raw yarn were measured and derived (C max -C min ) / C aver The ×100 value was taken as the ΔC value and is shown in Table 1 below.

[0103] <Manufacturing of functional fabrics> The dyed 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 2 below.

[0104] [Example 2] The yarn and fabric were manufactured in the same manner as in Example 1, except that the pigment content in the color masterbatch was changed from 0.83 wt% to 0.40 wt% and the color masterbatch content in the melt was changed from 3 wt% to 3.3 wt%. The physical properties of the yarn and fabric manufactured in the same manner as in Example 1 were measured and are shown in Tables 1 and 2 below, respectively.

[0105] [Example 3] The yarn and fabric were manufactured in the same manner as in Example 1, except that the pigment content in the color masterbatch was changed from 0.83 wt% to 0.40 wt% and the color masterbatch content in the melt was changed from 3 wt% to 3.8 wt%. The physical properties of the yarn and fabric manufactured in the same manner as in Example 1 were measured and are shown in Tables 1 and 2 below, respectively.

[0106] [Comparative Example 1] In Example 1, a pigment was mixed with polyethylene chips having a weight-average molecular weight (Mw) of 134,277 g / mol, and then dried to prepare a primary master chip. The primary master chip was used as a color master batch, and yarn and fabric were manufactured in the same manner as in Example 1, except that the pigment content in the color master batch was changed to 10.0 wt % and the color master batch content in the melt was changed from 3 wt % to 0.25 wt %. The physical properties of the yarn and fabric manufactured in the same manner as in Example 1 were measured and are shown in Tables 1 and 2 below, respectively.

[0107] [Table 1]

[0108] [Table 2]

[0109] Referring to Tables 1 and 2 above, it can be seen that the fabrics according to the examples have excellent mechanical properties such as strength and elongation, as well as cool feeling properties, and the color uniformity of the yarn is very good.

[0110] Figure 5 shows the measurement results of the time-dependent CCM values ​​of spun-dyed polyethylene yarns spun according to the examples, through the measurement area of ​​the spun-dyed polyethylene yarn shown in Figure 2. Specifically, the CCM values ​​of the spun-dyed polyethylene yarns according to Examples 1 to 3 and the comparative example are shown.

[0111] Referring to FIG. 5, it was confirmed that the spun-dyed polyethylene yarn according to the present invention shows almost no color change even during long-term spinning, making it possible to produce yarn with excellent color uniformity.

[0112] As described above, the present invention has been described using specific matters and limited examples and drawings, but these are merely provided to help a more general understanding of the present invention. The present invention is not limited to the above examples, and various modifications and variations can be made from such descriptions by those having ordinary knowledge in the field to which the present invention pertains.

[0113] Therefore, the concept of the present invention should not be limited to the described embodiments, and all things that are equivalent or have equivalent modifications to 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]

[0114] 10: Multifilament 11: Filament 21: Base plate 23: Fabric 22a:T-box 22b:BT-box 100: Extruder 200: nozzle 300: Cooling section 400:Focusing part 500: Stretching part 600: Winder

Claims

1. In the dyed polyethylene yarn containing a pigment, A spun-dyed polyethylene yarn whose L* measured under the following measurement conditions satisfies the following formula: [Measurement conditions] The spun-dyed polyethylene yarn is wound around a flat substrate to form a measurement area, and CCM (Computer Color Matching) measurement is performed on the measurement area. CCM measurement is performed every 70 times when the spun-dyed polyethylene yarn is wound around the substrate, and measurements are performed at least n times (n is a natural number of 50 or more). [formula] (C ｍａｘ -C ｍｉｎ ) / C ａｖｅｒ ×100≦15 (C ｍａｘ , C ｍｉｎ , and C ａｖｅｒ denote the maximum, minimum, and average values ​​for L*, respectively.)

2. 2. The spun-dyed polyethylene yarn according to claim 1, wherein the standard deviation of the L* value when measuring the yarn in CCM is 3 or less.

3. The spun-dyed polyethylene yarn according to claim 1, wherein the pigment is contained in an amount of 0.00005 to 1 wt % based on the total weight of the spun-dyed polyethylene yarn.

4. 2. The spun-dyed polyethylene yarn according to claim 1, wherein the crystallinity of the yarn is 60 to 80%.

5. 2. The spun-dyed polyethylene yarn according to claim 1, wherein the yarn has an initial modulus of 10 to 300 cN / dtex and a tenacity of 1.5 to 20 g / d, as measured in accordance with ASTM D2256.

6. 2. The spun-dyed polyethylene yarn according to claim 1, wherein the yarn has a melt index (MI, @190°C) measured in accordance with ASTM D1238 of 0.5 to 22 g / 10 min.

7. The spun-dyed polyethylene yarn according to claim 1, wherein the yarn has a dry heat shrinkage (@100°C) according to ASTM D4974-04 of 2 to 15%.

8. A functional fabric produced from the dyed polyethylene yarn of any one of claims 1 to 7.

9. The fabric has a cooling sensation of 0.1 to 0.3 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 8,

10. The fabric has a thickness direction thermal conductivity of 0.05 to 0.25 W / mK measured at 20 ± 2 ° C. and 65 ± 2% RH by contacting a 30 ± 2 ° C. heat source plate (BT-box) with the fabric at 20 ± 2 ° C. The functional fabric according to claim 8, wherein the thermal conductivity is 0.05 to 0.25 W / mK.

11. A color master batch is prepared by mixing a pigment into chip-shaped polyethylene, drying the mixture to prepare a first master chip, and repeating the steps of melting the first master chip, remixing the mixture, and drying the mixture 2 to 5 times to prepare second to fifth master chips, wherein the color master batch contains 0.05 to 10% by weight of the pigment based on the total weight of the color master batch; A method for producing the spun-dyed polyethylene yarn according to claim 1, comprising preparing a polyethylene resin composition containing 0.1 to 10% by weight of this color masterbatch.

12. A method for producing dyed polyethylene yarn as described in Claim 11, wherein the color masterbatch contains 0.1 to 5 weight percent pigment based on its total weight.

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