Functional fabric

Abstract

The present invention relates to a functional fabric, specifically a functional fabric that does not irritate the skin, has excellent washing durability, excellent antibacterial and deodorizing properties, quickly discharges moisture generated by the human body such as sweat or exhaled breath, and quickly dissipates heat.

Description

Technical Field

[0001] The present invention relates to a functional fabric, and more particularly to a functional fabric that does not irritate the skin, has excellent washing durability, excellent antibacterial and deodorizing properties, quickly discharges moisture generated by the human body such as sweat or exhalation, and quickly dissipates heat. Background Art

[0002] Recently, due to the novel coronavirus (COVID-19), the usage of masks has been surging, and side effects caused by the use of masks are also occurring.

[0003] With long-term mask wearing, exhalation makes the mask wet, preventing normal moisture discharge and heat dissipation, resulting in stuffiness, and causing skin problems when in contact with the skin.

[0004] Masks made of cotton can absorb moisture and sweat well, but have a low discharge function. During use, moisture remains due to breathing, which may provide an environment prone to bacterial growth. Additionally, when exposed to moisture or sweat, the mechanical properties of the fabric sharply decrease, leading to durability problems. Also, when washed, cotton fibers composed of single fibers exist in a fuzzed form in the fabric due to shedding or exposure, forming an air layer and showing a heat preservation effect. Moreover, due to the characteristic surface roughness of cotton fabric, it causes irritation when in contact with the skin.

[0005] In addition, masks made of synthetic fibers such as polyester and nylon as non-woven fabrics are being used. However, since non-woven fabrics are made of single fibers, they irritate the skin when worn, causing a stinging sensation. Also, when washed, the functionality of the mask decreases, single fibers shed or a part detaches from the aggregate and exists in a fuzzed form, instead providing a heat preservation effect. Therefore, they cannot be washed, or after washing, the functionality is greatly reduced. When used in summer, they instead accumulate heat and cause sweating, and irritate the skin, causing skin problems, so they are discarded after one use.

[0006] In addition, when functional additives are coated or added to the fabric for antibacterial, deodorizing, and skin problem elimination purposes, although functionality can be temporarily provided, after long-term use and washing, the function of the additives decreases or they fall off, making it difficult to maintain the function. There is also a problem that the weight of the fabric increases with the addition of functional additives.

[0007] Therefore, as a fiber fabric for masks, there is a need for a functional fabric that does not cause skin problems even when in direct contact with the skin, quickly discharges exhalation or heat generated by breathing to prevent discomfort to the user, and has excellent antibacterial and deodorizing properties even without using additional additives for providing antibacterial and deodorizing properties. Summary of the Invention

[0008] Technical problem

[0009] One technical problem of the present invention for solving the problems in the prior art is to provide a functional fabric which is light in weight when worn, can provide a soft touch when in contact with the skin in a dry state, can quickly discharge moisture generated by the human body such as sweat or exhaled breath, and can quickly dissipate heat.

[0010] In addition, it aims to provide a functional fabric which has a smooth surface, is made of long fibers, does not irritate the skin even when in direct contact with the human body, and has excellent antibacterial and deodorant properties without the need for additional additives.

[0011] In addition, it aims to provide a functional fabric which is knitted and is more flexible and has a soft touch.

[0012] In addition, it aims to provide a functional fabric which has excellent durability and can maintain its functionality even after long-term use and washing, and does not pilling, so that the problem of being difficult to reuse due to the heat preservation effect after washing in the past can be solved.

[0013] In addition, it aims to provide a functional fabric which does not need to coat or impregnate additional functional additives on the fabric or fiber to provide the above-mentioned functionality, and the fabric itself exhibits functionality.

[0014] Technical solution

[0015] The inventor of the present invention conducted research to achieve the above object, and as a result, found that by providing a fabric knitted with polyethylene yarns whose melt index, polydispersity index, and crystallinity satisfy a specific range, all of the above objects can be achieved, thus completing the present invention. Specifically, it was found that it can quickly discharge moisture generated by the human body such as sweat or exhaled breath, quickly dissipate heat, can eliminate the humid heat feeling caused by moisture, and when in direct contact with the skin, has a soft touch and does not cause problems, and has excellent durability and can maintain its functionality for a long time even after washing, thus completing the present invention.

[0016] In an embodiment of the present invention, it relates to a functional fabric which is composed of a knitted fabric using polyethylene yarns, the water contact angle is 110 degrees or more, and the areal density is 100 - 800 g / m 2, the pilling resistance measured by the pilling box method specified in KS K ISO 12945-1:2014 under the condition of 14,400 revolutions is above grade 4, wherein the melt index (MI) of the polyethylene yarn measured at 190 °C and 2.16 kg is 0.1 to 5 g / 10 min, the polydispersity index is greater than 5 and less than or equal to 12, and the crystallinity is 60% to 90%.

[0017] As one embodiment, the heat retention rate of the fabric according to KS K 0560:2018B method may be 30% or less.

[0018] As one embodiment, the antibacterial property of the fabric according to KS K 0693:2016 may be 50% or more, and the deodorization rate of ammonia measured by the gas detection tube method for 30 minutes to 120 minutes is 10% to 30%.

[0019] As one embodiment, the abrasion resistance of the fabric measured by the Martindale method specified in KS K ISO 12947-2:2014 may be 20,000 cycles or more.

[0020] As one embodiment, the contact cool feeling of the fabric measured at 20 ± 2 °C and 65% ± 2% R.H may be 0.2 W / cm 2 or more, and the thermal conductivity in the thickness direction at 20 °C may be 0.1 W / mK or more.

[0021] As one embodiment, the density of the polyethylene yarn may be 0.941 to 0.965 g / cm 3 , and the weight average molecular weight may be 90,000 to 400,000 g / mol.

[0022] As one embodiment, the initial modulus of the polyethylene yarn according to ASTM D2256 may be 100 to 300 g / d, and the elongation is 6% to 12%.

[0023] As one embodiment, the tensile strength of the polyethylene yarn may be 10 to 20 g / d.

[0024] As one embodiment, the polyethylene yarn may have a circular cross-section.

[0025] As one embodiment, the polyethylene yarn may include 25 to 500 filaments with a fineness of 1 to 3 denier respectively, and the total fineness may be 50 to 500 denier.

[0026] As an embodiment, the water contact angle of the fabric may be 110° or more.

[0027] As an embodiment, after 100 times of washing and drying processes implemented according to the standard process of a washing machine, the pilling resistance measured under the condition of 14,400 rotations according to the pilling box method specified in KS K ISO 12945-1:2014 of the fabric may be grade 4 or more.

[0028] In another embodiment of the present invention, there is provided a cool-sensation mask, which includes the functional fabric of the above-mentioned embodiment.

[0029] Advantageous Effects

[0030] Even when the functional fabric of the present invention is in direct contact with the skin, it has little friction, does not irritate the skin, can quickly discharge sweat or moisture generated by humidity and exhalation, and dissipates heat outward, thus having the effect of reducing the feeling of damp heat.

[0031] In addition, it has excellent durability, less pilling occurs, and very excellent abrasion resistance. Therefore, after washing, there will be no fuzzing, and after washing, the damage to the fabric is less, it can continuously maintain its functionality, and can extend the service life of the product.

[0032] In addition, it is formed of a hydrophobic material with a moisture regain of 0%, thus having the property of discharging moisture, drying quickly, reducing the breeding environment of bacteria, and therefore having excellent antibacterial and deodorant properties.

[0033] In addition, it is woven from highly crystalline long fibers. Therefore, it can provide a flexible and soft-touch fabric. When worn, due to its light weight, it has an excellent wearing feeling.

[0034] The functional fabric of the present invention is not limited thereto, and can be appropriately applied to face masks, and in addition, can also be appropriately used for summer fabrics. Specifically, for example, it can be used for quilts, clothing, arm sleeves, gloves, covers, etc. that are in direct contact with the skin in summer. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 It is a diagram schematically showing a polyethylene yarn manufacturing apparatus according to an embodiment of the present invention.

[0036] Figure 2 It is a diagram schematically showing an apparatus for measuring the contact cool-sensation of a fabric.

[0037] Figure 3 It is a diagram schematically showing an apparatus for measuring the thermal conductivity in the thickness direction of a fabric. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0038] Hereinafter, the present invention will be described in more detail.

[0039] Unless otherwise defined, all technical and scientific terms have the same meaning as commonly understood by one of ordinary skill in the art. The terms used in the description of the present invention are only used to effectively describe specific specific examples and are not intended to limit the present invention.

[0040] In addition, unless otherwise specifically indicated in the text, the singular forms used in the specification and the appended claims include the plural forms.

[0041] In addition, unless there is a clear contrary record, when a part "includes" a certain component, it does not exclude other components, but means that other components can be further included.

[0042] [Polyethylene yarn]

[0043] In one embodiment of the present invention, the melt index (MI) of the polyethylene yarn measured at 190 °C and 2.16 kg can be 0.1 to 5 g / 10 min, the polydispersity index can be greater than 5 and less than or equal to 12, and the crystallinity can be 60% to 90%. Within the range of satisfying all the above physical properties, it is possible to provide a fabric that is light even when the fabric is manufactured to have a high areal density of 100 to 800 g / m 2 in the range, and the fabric is light, has excellent durability, and does not pilling even during long-term use and washing, and can maintain excellent washing durability of functionality for a long time, so as to quickly discharge moisture and heat such as sweat or exhaled breath.

[0044] As an embodiment, the melt index (MI) of the polyethylene yarn measured at 190 °C and 2.16 kg may be 0.1 to 5 g / 10 min, more preferably 0.3 to 3 g / 10 min, and even more preferably 1 to 3 g / 10 min. Additionally, the weight average molecular weight may be 90,000 to 400,000 g / mol, preferably 100,000 to 400,000 g / mol, and even more preferably 300,000 to 350,000 g / mol. When melt-extruding the yarn within this range, the fluidity of the melt is good, the occurrence of thermal decomposition is prevented, and processability such as no filament breakage during stretching is ensured, enabling the production of yarn with uniform physical properties and providing a fabric with excellent durability and wash durability. Specifically, a fabric can be provided with a pilling resistance of 4 or more, more preferably 4 to 5, measured according to the pilling box method specified in KS K ISO 12945-1:2014 under the condition of 14,400 revolutions. Additionally, a fabric can be provided that still has a pilling resistance of 4 or more, more preferably 5, even after being washed more than 100 times. Additionally, a fabric can be provided with a abrasion resistance of 20,000 cycles or more measured according to the Martindale method specified in KS K ISO 12947-2:2014.

[0045] Within the range where the pilling resistance and abrasion resistance satisfy this range, it is possible to prevent skin problems from occurring when used in fabrics that come into direct contact with the skin such as masks, and to prevent the fuzzing phenomenon caused by pilling, thereby preventing the generation of a heat sensation. More specifically, a fabric can be provided with a heat retention rate of 30% or less, preferably 5% to 30%, according to the KS K 0560:2018B method.

[0046] Additionally, high-density polyethylene (HDPE) with a density of 0.941 to 0.965 g / cm 3 and a polydispersity index satisfying a range greater than 5 and less than or equal to 12, more preferably greater than 5 and less than or equal to 9, can be used. Through melt spinning, fibers with a crystallinity of 60% to 90% are obtained. The crystallinity of the polyethylene yarn can be derived together with the microcrystalline size when performing crystallinity analysis using an X-ray diffractometer. Within the range where the crystallinity satisfies this range, heat rapidly diffuses and dissipates along the direction of the molecular chains connected by covalent bonds in the high-density polyethylene (HDPE) through lattice vibrations called "phonons", improving the moisture discharge function for sweat and exhaled breath, etc., thereby enabling the provision of a fabric with excellent wearing comfort. More specifically, a fabric can be provided with a contact cool feeling of 0.2 W / cm measured at 20 ± 2 °C and 65% ± 2% R.H.2 Fabric with a thermal conductivity in the thickness direction of 0.1 W / mK or more at 20°C. More specifically, the contact cool feeling measured at 20 ± 2°C and 65% ± 2% R.H. can be 0.2 to 0.8 W / cm 2 , and the thermal conductivity in the thickness direction at 20°C can be 0.1 to 0.3 W / mK.

[0047] The polyethylene yarn can be melt-spun. Therefore, the moisture regain is substantially as low as 0%, and it has excellent hydrophobicity, meeting the physical property of a water contact angle of 110 degrees or more, more preferably 110 to 150 degrees. When in direct contact with the skin, it does not contain moisture but directly discharges it, thus minimizing the breeding environment for bacteria, etc., and without the need for additional additives, the fabric itself has antibacterial and deodorizing properties. Specifically, it can provide a fabric with an antibacterial degree of 50% or more according to KS K 0693:2016, specifically 50% to 90%, and a deodorization rate of ammonia of 10% to 30% measured by the gas detection tube method for 30 minutes to 120 minutes.

[0048] As an embodiment, the initial modulus of the yarn according to ASTM D2256 can be 100 to 300 g / d, preferably 120 to 200 g / d, the elongation is 6% to 12%, preferably 8% to 12%, and the tensile strength is 10 to 20 g / d, preferably 12 to 20 g / d. Although not limited to this, when within this range, it is more flexible, and after knitting, it can further provide elasticity and flexibility, and can provide an excellent wearing feeling. In addition, within this range, the pilling caused by friction can be minimized, and the fabric can be prevented from being damaged due to friction, so it is preferred.

[0049] As an embodiment, although not limited to this, the cross-sectional shape of the yarn preferably has a circular cross-section. By manufacturing it into a circular cross-section, the moisture can be adsorbed on the surface of the fiber minimally and directly discharged, thus providing a fabric with more excellent antibacterial and deodorizing properties.

[0050] As an embodiment, the yarn may include 25 to 500 filaments with a fineness of 1 to 3 denier each, and the total fineness can be 50 to 500 denier. Within this range, a fabric with a light weight, excellent durability and washing durability can be provided.

[0051] Hereinafter, referring to Figure 1, a manufacturing method of polyethylene yarn according to an embodiment of the present invention will be described in detail. As long as the polyethylene yarn of the present invention satisfies the ranges of various physical properties such as water contact angle, areal density, and pilling resistance, there is no limitation on its manufacturing method. Hereinafter, an embodiment will be described.

[0052] First, polyethylene in the form of chips is put into an extruder 100 and melted to obtain a polyethylene melt.

[0053] The melted polyethylene is transported through a screw (not shown) in the extruder 100 and passed through a spinneret 200, and is extruded through a plurality of holes formed in the spinneret 200. The number of the plurality of holes of the spinneret 200 can be determined according to the denier per filament (DPF) and fineness of the yarn to be manufactured. For example, when manufacturing a yarn with a total fineness of 75 denier, the spinneret 200 may have 20 to 75 holes, and when manufacturing a yarn with a total fineness of 450 denier, the spinneret 200 may have 90 to 450 holes, preferably 100 to 400 holes.

[0054] The melting process implemented in the extruder and the extrusion process implemented through the spinneret can be changed and applied according to the melt index of the polyethylene chips. Specifically, for example, it can be implemented at 150 to 315 °C, preferably at 250 to 315 °C, and more preferably at 265 to 310 °C. That is, the extruder 100 and the spinneret 200 can be maintained at 150 to 315 °C, preferably 250 to 315 °C, and more preferably 265 to 310 °C.

[0055] When the spinning temperature is lower than 150 °C, the low spinning temperature will cause the polyethylene to not melt uniformly, making it difficult to perform spinning. On the contrary, when the spinning temperature is higher than 315 °C, it will cause the thermal decomposition of the polyethylene, resulting in the inability to exhibit the required strength.

[0056] The ratio L / D of the hole length (L) to the hole diameter (D) of the spinneret 200 can be 3 to 40. When L / D is less than 3, during the melt extrusion, a die swell phenomenon will occur, and it is difficult to control the elastic behavior of the polyethylene, resulting in poor spinnability. When L / D is greater than 40, the necking phenomenon of the melted polyethylene passing through the spinneret 200 will cause filament breakage, and uneven discharge will occur due to pressure drop.

[0057] When the melted polyethylene is discharged from the plurality of holes of the spinneret 200, the polyethylene begins to solidify due to the difference between the spinning temperature and the room temperature, and a plurality of semi-solidified filaments 11 are formed. In this specification, both semi-solidified filaments and fully solidified filaments are collectively referred to as "filaments".

[0058] The plurality of filaments 11 are cooled in a cooling section (or, "quenching zone") 300 so as to be completely solidified. The cooling of the plurality of filaments 11 can be carried out by an air-cooling method.

[0059] The cooling of the plurality of filaments 11 carried out in the cooling section 300 is preferably carried out by using cooling air with a wind speed of 0.2 to 1 m / sec at 15 to 40°C. When the temperature of the cooling is lower than 15°C, overcooling will cause insufficient elongation, which may lead to filament breakage during the stretching process. When the cooling temperature is higher than 40°C, non-uniform solidification will cause an increase in the fineness deviation between the plurality of filaments 11, which may lead to filament breakage during the stretching process.

[0060] In addition, when cooling is carried out in the cooling section, multi-stage cooling can be implemented to carry out crystallization more uniformly, so that yarns with better moisture and sweat discharge and excellent antibacterial and deodorant properties can be manufactured. More specifically, the cooling section can be divided into three or more sections. For example, when composed of three cooling sections, it can be preferably designed such that the temperature gradually decreases from the first cooling section to the third cooling section. Specifically, for example, the first cooling section can be set at 40 to 80°C, the second cooling section can be set at 30 to 50°C, and the third cooling section can be set at 15 to 30°C.

[0061] In addition, the wind speed in the first cooling section can be set to be the highest to produce fibers with a smoother surface. Specifically, the first cooling section can be cooled by using cooling air with a wind speed of 0.8 to 1 m / sec at 40 to 80°C, the second cooling section can be cooled by using cooling air with a wind speed of 0.4 to 0.6 m / sec at 30 to 50°C, and the third cooling section can be cooled by using cooling air with a wind speed of 0.2 to 0.5 m / sec at 15 to 30°C. Adjusting according to such conditions can produce yarns with a higher degree of crystallinity and a smoother surface.

[0062] Next, the above-mentioned plurality of filaments 11 that have been cooled and completely solidified are bundled by a bundling machine 400 to form a multifilament 10.

[0063] As Figure 1 shown, the polyethylene yarn of the present invention can be made by a direct spinning and drawing (DSD) process. That is, the multifilament 10 can be directly transferred to a multi-stage stretching section 500 including a plurality of godet roller sections GR1...GRn and stretched in a multi-stage manner with a total stretching ratio of 2 to 20 times, preferably 3 to 15 times, and then wound by a winding machine. In addition, when performing multi-stage stretching, 1% to 5% of shrinkage stretching (relaxation) can be provided in the last stretching section, so as to provide yarns with more excellent durability.

[0064] As an alternative, the multifilament 10 may also be wound as an unstretched filament first, and then the unstretched filament is stretched to produce the polyethylene yarn of the present invention. That is, the polyethylene yarn of the present invention can also be produced by a two-step process of first melt-spinning polyethylene to produce an unstretched filament and then stretching the unstretched filament.

[0065] When the total draw ratio applied in the stretching process is less than 2, the finally obtained polyethylene yarn cannot have a crystallinity of more than 60%, and there is a risk of generating fuzz (pilling) on the fabric made of the yarn.

[0066] On the contrary, when the total draw ratio is greater than 15 times, filament breakage may occur, and the strength of the finally obtained polyethylene yarn is inappropriate. Therefore, not only the weavability of the polyethylene yarn is poor, but also the fabric made therefrom is too stiff and uncomfortable for users.

[0067] When determining the linear velocity of the first godet roller section (GR1) for determining the spinning speed of the melt spinning of the present invention, the linear velocities of the remaining plurality of godet roller sections can be appropriately determined in such a way that a total draw ratio of 2 to 20 times, preferably 3 to 15 times, is applied to the multifilament 10 in the multi-stage stretching section 500.

[0068] According to an embodiment of the present invention, the temperatures of the plurality of godet roller sections GR1... GRn of the multi-stage stretching section 500 can be appropriately set in the range of 40 to 140 °C, so as to heat-set the polyethylene yarn through the multi-stage stretching section 500. Specifically, the multi-stage stretching section may be composed of, for example, more than 3, specifically 3 to 5 stretching zones. In addition, each stretching zone may be composed of a plurality of godet roller sections.

[0069] Specifically, the multi-stage stretching section may be composed of 4 stretching zones, and after stretching at a total draw ratio of 7 to 15 times in the first stretching zone to the third stretching zone, a shrinkage draw (relaxation) of 1% to 3% is performed in the fourth stretching zone. The total draw ratio refers to the final draw ratio of the fiber passing through the first stretching zone to the third stretching zone relative to the fiber before stretching.

[0070] More specifically, the first stretching interval can be implemented at 40 - 130°C, and the total stretching ratio can be 2 - 5 times. The second stretching interval can be implemented at a temperature higher than the first stretching interval, specifically at 100 - 150°C, and stretching can be carried out with a total stretching ratio of 5 - 8 times. The third stretching interval can be implemented at 100 - 150°C, and stretching can be carried out with a total stretching ratio of 7 - 15 times. The fourth stretching interval can be implemented at a temperature equal to or lower than the second stretching interval, specifically at 80 - 140°C, and shrinkage stretching (relaxation) of 1% - 3% can be implemented.

[0071] The multi-stage stretching and heat setting of the multifilament 10 are simultaneously carried out by the multi-stage stretching unit 500, and the multi-stage stretched multifilament 10 is wound by the winding machine 600, thereby completing the polyethylene yarn of the present invention.

[0072] [Functional fabric]

[0073] In an embodiment of the present invention, the functional fabric can use the above-mentioned polyethylene yarn alone, or can further include heterogeneous yarns to further provide other functions. From the viewpoints of hydrophobicity and prevention of heat sensation, it is preferred to use the polyethylene yarn alone.

[0074] In addition, in an embodiment of the present invention, when the functional fabric is knitted, it can provide a fabric with excellent flexibility and lighter weight than woven fabrics even when the areal density increases. When applied to masks, etc., it can prevent skin problems even when in long-term contact with the skin, so it is more preferred. Woven fabrics or non-woven fabrics will pilling after washing, or single fibers will be exposed, thus irritating the skin. Therefore, in the present invention, it is preferred to use knitted fabrics.

[0075] It has been confirmed that the functional fabric of an embodiment of the present invention can simultaneously satisfy that the water contact angle is 110 degrees or more, preferably 130 degrees or more, specifically 110 - 150 degrees, the areal density is 100 - 800 g / m 2 , preferably 150 - 800 g / m 2 , the pilling resistance measured by the pilling box method specified in KS K ISO 12945-1:2014 under the condition of 14,400 rotations is 4 or more, preferably 4 - 5, and within this range, it can quickly discharge moisture and heat such as sweat and exhaled breath, and can maintain the function even after long-term washing.

[0076] In addition, the functional fabric can meet the requirements that the heat retention rate according to KS K 0560:2018B method is below 30%, preferably below 27%, without the need for additional addition of antibacterial agents. The antibacterial degree according to KS K 0693:2016 is above 50%, preferably 50 - 70%. The deodorization rate of ammonia measured by the gas detection tube method for 30 minutes to 120 minutes is 10% - 30%. The abrasion resistance measured by the Martindale method specified in KSK ISO 12947-2:2014 is above 20,000 cycles. The contact cool feeling measured at 20 ± 2°C, 65% ± 2% R.H is 0.2W / cm 2 All physical properties above, the thermal conductivity in the thickness direction at 20°C is above 0.1W / mK. Within this range, all required physical properties can be achieved, so it is preferred.

[0077] In addition, for the functional fabric of an embodiment of the present invention, even after 100 times of washing, the retention rate of its physical properties can be maintained above 70%, above 80%, and more preferably above 90%.

[0078] Hereinafter, the present invention will be described in more detail based on examples and comparative examples. However, the following examples and comparative examples are only examples for more detailed description of the present invention, and the present invention is not limited to the following examples and comparative examples.

[0079] The physical properties were measured in the following manner.

[0080] <Weight average molecular weight (Mw) (g / mol) and polydispersity index (PDI)>

[0081] After completely dissolving the polyethylene yarn in the following solvent, the weight average molecular weight (Mw) and polydispersity index (Mw / Mn; PDI) of the polyethylene yarn were respectively obtained by gel permeation chromatography (GPC) described later.

[0082] - Analytical instrument: HLC-8321GPC / HT of Tosoh Corporation

[0083] - Column: PLgel guard (7.5×50mm) + 2×PLgel mixed-B (7.5×300mm)

[0084] - Column temperature: 160°C

[0085] - Solvent: Trichlorobenzene (TCB) + 0.04wt% of dibutylhydroxytoluene (BHT) (after drying with 0.1% CaCl2)

[0086] - Temperature of Injector and Detector: 160 °C

[0087] - Detector: Refractive Index Detector (RI Detector)

[0088] - Flow rate: 1.0 mL / min

[0089] - Injection volume: 300 mL

[0090] - Sample concentration: 1.5 mg / mL

[0091] - Standard sample: Polystyrene

[0092] <Tensile strength (g / d), Initial modulus (g / d), and Elongation (%)>

[0093] According to the ASTM D2256 method, the stress-strain curve of the polyethylene yarn was obtained using a universal tensile tester from Instron Engineering Corp., Canton, Mass. The length of the sample was 250 mm, the tensile speed was 300 mm / min, and the initial load was set at 0.05 g / d. The tensile strength (g / d) and elongation (%) were determined from the stress and tensile length at the break point, and the initial modulus (g / d) was determined from the tangent line of the curve with the maximum slope near the origin. Five measurements were made for each yarn and the average value was calculated.

[0094] <Crystallinity of the yarn>

[0095] The crystallinity of the polyethylene yarn was measured using an XRD instrument (X-ray Diffractomer) [manufacturer: PANalytical, model: EMPYREAN]. Specifically, the polyethylene yarn was cut to prepare a sample with a length of 2.5 cm. After fixing the sample in the sample holder, the measurement was carried out under the following conditions.

[0096] - X-ray Source: Cu-Kα radiation

[0097] - Power: 45 kV × 25 mA

[0098] - Mode: Continuous scanning mode

[0099] - Scanning angle range: 10° to 40°

[0100] - Scanning speed: 0.1 ° / sec

[0101] <Melt Index>

[0102] The measurement was carried out according to ASTM D1238 at 190 °C under 2.16 kg.

[0103] <Water Contact Angle>

[0104] Using a dynamic water contact angle measuring instrument (manufactured by Fibro, model 1100DAT), 4 μL of distilled water was dropped on the surface of the sheet, and the water contact angle 30 seconds after dropping was measured.

[0105] <Pilling Resistance>

[0106] Using a Martindale tester, according to the pilling box method specified in KS K ISO 12945—1:2014, the pilling resistance of the fabric was measured under the condition of 14,400 revolutions. The pilling resistance grade standard is as follows.

[0107] - Grade 1: Very severe pilling

[0108] - Grade 2: Severe pilling

[0109] - Grade 3: Moderate pilling

[0110] - Grade 4: Slight pilling

[0111] - Grade 5: No pilling at all

[0112] <Durability after Washing>

[0113] After subjecting the manufactured fabric to 100 washing and drying processes according to the standard washing machine procedure, the physical properties of the fabric were compared with those of the initial fabric before washing.

[0114] 1) Pilling resistance after washing

[0115] After 100 washes, the above-mentioned pilling resistance test was carried out.

[0116] 2) Change in heat retention after washing

[0117] After 100 washes, the above-mentioned heat retention test was carried out.

[0118] 3) Skin irritation after washing

[0119] After 100 washes, the above-mentioned skin irritation test was carried out.

[0120] 4) Change in antibacterial property after washing

[0121] After 100 washes, the above-mentioned antibacterial property test was carried out.

[0122] <Heat retention rate>

[0123] Entrusted the Korea Apparel Testing and Research Institute to measure the heat retention rate according to Method B of KS K 0560:2018.

[0124] <Antibacterial property>

[0125] Entrusted the Korea Apparel Testing and Research Institute to measure the antibacterial property (%) according to KS K 0693:2016.

[0126] Test bacteria: Staphylococcus aureus ATCC 6538 (Staphylococcus aureus)

[0127] Klebsiella pneumonia ATCC 4352 (Klebsiella pneumoniae)

[0128] Concentration of the inoculated bacterial solution: 1.1×10 5 CFU / mL

[0129] For Klebsiella pneumoniae it was 0.8×10 5 CFU / mL

[0130] Control: Standard cotton cloth

[0131] Non-ionic surfactant: Tween 80, added at 0.05% of the inoculated bacterial solution

[0132] <Deodorizing property>

[0133] Entrusted the Korea Apparel Testing and Research Institute to evaluate the deodorization rate of ammonia by the gas detector tube method.

[0134] Experiment time: 30 minutes, 60 minutes, 90 minutes, 120 minutes

[0135] <Experimental conditions>

[0136] Sample size: 10 cm×10 cm (2.0 g)

[0137] Experimental gas: Ammonia

[0138] Concentration of the injected experimental gas: 500 μg / mL

[0139] Volume of the container: 1000 mL

[0140] Experimental environment: Temperature is 20°C and humidity is 65%

[0141] Deodorization rate (%) = [(Concentration of blank gas - Concentration of sample gas) / Concentration of blank gas]×100

[0142] <Skin irritation>

[0143] After manufacturing a mask using the fabric, 30 men and women in their teens and twenties wore the mask for 8 hours, and then skin irritation was judged by the naked eye.

[0144] The degree of papule, flushing, and heat sensation was evaluated on a 5-point scale and the average value was calculated.

[0145] From 1 to 5, the occurrence of papule, flushing, and heat sensation becomes more and more severe.

[0146] <Cool feeling on contact>

[0147] Entrust the Korea Testing & Research Institute of Clothing to measure using the KES-F7 (Thermo Labo II) device in an experimental environment of 20 ± 2°C and 65% ± 2% R.H.

[0148] Specifically, after preparing a fabric sample with a size of 20 cm × 20 cm, it was placed for 24 hours under the conditions of a temperature of 20 ± 2°C and an RH of 65% ± 2%. Next, in a test environment of a temperature of 20 ± 2°C and an RH of 65% ± 2%, the cool feeling on contact (Q max) of the fabric was measured using the KES-F7 THERMO LABO II (Kato Tech Co., LTD.) device. Specifically, as Figure 2 shown, the fabric sample 23 was placed on a substrate (also called "cold plate (Water-Box)") 21 maintained at 20°C, and a heat storage plate (T-Box) 22a heated to 30°C (contact area: 3 cm × 3 cm) was placed on the fabric sample 23 for only 1 second. That is, the other surface of the fabric sample 23 in contact with the substrate 21 was instantaneously contacted with the heat storage plate (T-Box) 22a. The contact pressure applied to the fabric sample 23 by the heat storage plate (T-Box) 22a was 6 gf / cm 2 . Next, the Q max value displayed on a monitor (not shown) connected to the device was recorded. This test was repeated 10 times, and the arithmetic mean of the Q max values was calculated.

[0149] <Thermal conductivity>

[0150] After preparing a fabric sample with dimensions of 20 cm × 20 cm, it is placed for 24 hours under the conditions of a temperature of 20 + 2 °C and an RH of 65% ± 2%. Next, under a test environment with a temperature of 20 + 2 °C and an RH of 65% ± 2%, using a KES-F7 THERMO LABO II (Kato Tech Co., LTD.) device, the thermal conductivity and thermal diffusivity of the fabric are determined. Specifically, as Figure 3 shown, the fabric sample 23 is placed on a substrate 21 maintained at 20 °C, and a heat source stage (BT-Box) 22b heated to 30 °C (contact area: 5 cm × 5 cm) is placed on the fabric sample 23 for 1 minute. During the contact between the heat source stage (BT-Box) 22b and the fabric sample 23, the heat source stage (BT-Box) 22b is continuously heated to maintain its temperature at 30 °C. The heat supplied to maintain the temperature of the heat source stage (BT-Box) 22b [i.e., heat flow loss] is displayed on a monitor (not shown) connected to the device. This test is repeated 5 times, and the arithmetic mean of the heat flow loss is calculated. Next, the thermal conductivity and thermal diffusivity of the fabric are calculated using Equation 2 and Equation 3.

[0151] Equation 2: K = (W.D) / (A.Δ)

[0152] Equation 3: k = K / D

[0153] where K is the thermal conductivity (W / cm.°C), D is the thickness (cm) of the fabric sample 23, A is the contact area of the heat source stage (BT-Box) 22b (= 25 cm 2 ), Δ is the temperature difference between the two surfaces of the fabric sample 23 (= 10 °C), W is the heat flow loss (watts; Watt), and k is the thermal diffusivity (W / cm 2 .°C).

[0154] <Abrasion Resistance>

[0155] The abrasion resistance of the fabric was measured using a Martindale tester according to the Martindale method specified in KS K ISO 12947-2:2014. Specifically, the number of cycles until two threads in the fabric were broken was measured.

[0156] [Example 1]

[0157] <Manufacturing Polyethylene Yarn>

[0158] Using the one shown in Figure 1The device in manufactures polyethylene yarns containing 200 filaments and having a total fineness of 150 deniers.

[0159] Specifically, polyethylene chips with a density of 0.960 g / cm 3 , a weight-average molecular weight (Mw) of 328,000 g / mol, a polydispersity index (PDI) of 7.8, and a melt index (MI at 190 °C) of 1.5 g / 10 min are fed into an extruder 100 and melted. The molten polyethylene is extruded through a spinneret having 200 holes. The ratio of the hole length (L) to the hole diameter (D) of the spinneret, L / D, is 6. The temperature of the spinneret is 270 °C.

[0160] Multiple filaments 11 ejected from the multiple spinneret holes of the spinneret 200 and formed are successively cooled in a cooling section 300 composed of three zones. In the first cooling zone, cooling is performed at 50 °C using cooling air with a wind speed of 0.9 m / sec. In the second cooling zone, cooling is performed at 35 °C using cooling air with a wind speed of 0.5 m / sec. In the third cooling zone, final cooling is performed at 25 °C using cooling air with a wind speed of 0.4 m / sec. After cooling, the filaments are bundled into a multifilament 10 by a bundling machine 400.

[0161] Next, the multifilament is moved to a stretching section 500. The stretching section is composed of a multi-stage stretching section, which is composed of 4 zones. Specifically, in the first stretching zone, stretching is performed at a maximum stretching temperature of 100 °C with a total stretching ratio of 3 times. In the second stretching zone, stretching is performed at a maximum stretching temperature of 140 °C with a total stretching ratio of 8 times. In the third stretching zone, stretching is performed at a maximum stretching temperature of 130 °C with a total stretching ratio of 10 times. In the fourth stretching zone, after stretching at a maximum stretching temperature of 120 °C in a manner that is 2% contractile stretching (relaxed) compared to the third stretching zone, heat setting is performed.

[0162] Next, the above-mentioned stretched multifilament is wound by a winding machine 600. The winding tension is 0.8 g / d.

[0163] The physical properties of the manufactured yarns are measured and shown in Table 1.

[0164] <Manufacturing Functional Fabrics>

[0165] The above-mentioned manufactured polyethylene yarns are knitted to manufacture knitted fabrics. The physical properties of the manufactured knitted fabric are measured and shown in Table 3.

[0166] [Examples 2 to 7]

[0167] Except for changing the conditions according to Table 1, manufacturing is carried out in the same manner as in Example 1.

[0168] In addition, the physical properties of the fabric manufactured in the same manner as in Example 1 were measured and are shown in Table 3.

[0169] [Comparative Examples 1 to 3]

[0170] Manufacture was carried out in the same manner as in Example 1, except that the conditions were changed according to Table 2.

[0171] In addition, the physical properties of the fabric manufactured in the same manner as in Example 1 were measured and are shown in Table 4.

[0172] [Comparative Example 4]

[0173] Using the same raw materials as in Example 1 and manufacturing in the same manner, the conditions of the cooling process and the stretching process were changed as follows.

[0174] In the cooling process, in the cooling unit 300, final cooling was carried out at 25°C using cooling air with a wind speed of 0.5 m / sec, bundled into multifilaments 10 by the bundling machine 400, and moved to the multi-stage stretching unit 500.

[0175] In the stretching process, stretching was carried out in a stretching section consisting of a total of 1 section. The stretching section consists of a total of five wire guide roller sections, the temperatures of the plurality of wire guide roller sections are set to 80 to 125°C, and the temperature of the rear wire guide roller section is set higher than that of the frontmost wire guide roller section. Stretching was carried out at a total stretching ratio of 7.5.

[0176] The physical properties of the manufactured fabric were measured and are shown in Table 4.

[0177] [Comparative Example 5]

[0178] Using the same raw materials as in Example 1 and manufacturing in the same manner, except that the stretching temperatures in the first stretching section to the fourth stretching section were 140°C, manufacturing was carried out in the same manner as in Example 1.

[0179] In addition, the physical properties of the manufactured fabric were measured in the same manner as in Example 1 and are shown in Table 4.

[0180] [Comparative Example 6]

[0181] Using the same raw materials as in Example 1 and manufacturing in the same manner, except that the stretching temperatures in the first stretching section to the second stretching section were 120°C and the stretching temperatures in the third stretching section to the fourth stretching section were 80°C, manufacturing was carried out in the same manner as in Example 1.

[0182] In addition, the physical properties of the manufactured fabric were measured in the same manner as in Example 1 and are shown in Table 4.

[0183] [Comparative Example 7]

[0184] Manufacturing was carried out in the same manner as in Comparative Example 4, except that the conditions were changed according to Table 2.

[0185] In addition, the physical properties of the fabric produced were measured in the same manner as in Example 1 and are shown in Table 4.

[0186] [Comparative Example 8]

[0187] Manufacturing was carried out in the same manner as in Example 1, except that the conditions were changed according to Table 2.

[0188] In addition, the physical properties of the fabric manufactured in the same manner as in Example 1 were measured and are shown in Table 4.

[0189] [Comparative Example 9]

[0190] Using rayon yarn with a circular cross-section, a knitted fabric was manufactured in the same method as in Example 1, and then the physical properties of the fabric were evaluated. It was confirmed that the contact cool feeling was very low, 0.085 W / cm 2 , and the thermal conductivity was lower than that of the example, 0.0260 W / mK. In addition, it was confirmed that the skin irritation was not good, grade 4, and the skin irritation after washing was even worse.

[0191] [Comparative Example 10]

[0192] Using polyethylene terephthalate yarn with a circular cross-section, a knitted fabric was manufactured in the same method as in Example 1, and then the physical properties of the fabric were evaluated. It was confirmed that the contact cool feeling was low, 0.119 W / cm 2 , and the thermal conductivity was lower than that of the example, 0.1109 W / mK. In addition, it was confirmed that the skin irritation was not good, grade 3, and the skin irritation after washing was even worse.

[0193] Table 1:

[0194]

[0195] Table 2:

[0196]

[0197] Table 3:

[0198]

[0199] Table 4:

[0200]

[0201] Referring to Table 3 to Table 4, it can be confirmed that the functional fabric of the present invention has excellent cool feeling while having very low skin irritation. In addition, it can be confirmed that it has excellent durability, less pilling occurs, and its abrasion resistance is very excellent. Therefore, even after washing, there will be no linting, and even after washing, the damage to the fabric is less, and the functionality can be continuously maintained. Further, it can be confirmed that it has high antibacterial property.

[0202] The present invention has been described above through multiple specific matters, defined embodiments and drawings, but this is only for helping to more comprehensively understand the present invention. The present invention is not limited to the above embodiments, and those skilled in the art can make various modifications and deformations based on this description.

[0203] Therefore, the idea of the present invention is not limited to the described embodiments, and the appended claims and their equivalent or equivalent deformations all belong to the scope of the idea of the present invention.

Claims

1. A functional fabric, characterized in that, It is composed of a knitted fabric made of polyethylene yarn, with a surface density of 100 to 800 g / m 2 , and the pilling resistance measured by the pilling box method specified in KS KISO 12945-1:2014 under the condition of 14,400 revolutions is above grade 4. Among them, the melt index (MI) of the polyethylene yarn measured according to ASTM D1238 is 0.1 to 5 g / 10 min, the polydispersity index is greater than 5 and less than or equal to 12, and the crystallinity is 60% to 90%. wherein, the initial modulus of the polyethylene yarn according to ASTM D2256 is 100 - 300 g / d, and the elongation at break is 6% - 12%.

2. The functional fabric according to claim 1, characterized in that, the heat retention rate of the fabric according to the KS K 0560:2018B method is 30% or less.

3. The functional fabric according to claim 1, characterized in that, the antibacterial degree of the fabric according to KS K 0693:2016 is 50% or more, and the deodorization rate of ammonia gas measured by the gas detector tube method for 30 minutes to 120 minutes is 10% - 30%.

4. The functional fabric according to claim 1, characterized in that, the abrasion resistance of the fabric measured by the Martindale method specified in KS KISO 12947-2:2014 is 20,000 times or more.

5. The functional fabric according to claim 1, characterized in that, The contact cool feeling of the fabric measured at 20±2°C and 65%±2%R.H is 0.2W / cm 2 or more, and the thermal conductivity in the thickness direction at 20°C is 0.1W / mK or more.

6. The functional fabric according to claim 1, characterized in that, The density of the polyethylene yarn is 0.941 to 0.965 g / cm 3 , and the weight-average molecular weight is 90,000 to 400,000 g / mol.

7. The functional fabric according to claim 1, characterized in that, the tensile strength of the polyethylene yarn is 10 - 20 g / d.

8. The functional fabric according to claim 1, characterized in that, the polyethylene yarn has a circular cross-section.

9. The functional fabric according to claim 1, characterized in that, the polyethylene yarn contains 25 - 500 filaments with a fineness of 1 - 3 denier respectively, and the total fineness is 50 - 500 denier.

10. The functional fabric according to claim 1, characterized in that, the water contact angle of the fabric is 110° or more.

11. The functional fabric according to claim 1, characterized in that, after the fabric is washed and dried 100 times according to the standard process of a washing machine, the pilling resistance measured by the pilling box method specified in KS KISO12945-1:2014 under the condition of 14,400 rotations is 4 or more.

12. A cool-sensation mask, characterized in that, it includes the functional fabric according to any one of claims 1 to 11.

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