WO2023121164A1 - Modified cross-section polyethylene yarn, and functional fabric comprising same - Google Patents

Abstract

The present invention relates to a modified cross-section polyethylene yarn and a functional fabric comprising same, and more specifically, to: a modified cross-section polyethylene yarn from which a fabric having coolness and quick moisture-wicking ability can be produced; and a functional fabric comprising same. The polyethylene yarn according to the present invention contains filaments comprising, along a cross-section perpendicular to the longitudinal direction, a core body and at least two protrusions protruding from the core body, and has a crystallinity of 56 to 85%.

Description

Heterogeneous cross-section polyethylene yarn and functional fabric containing the same

The present invention relates to a modified cross-section polyethylene yarn and a functional fabric including the same, and more particularly, to a modified cross-section polyethylene yarn and a functional fabric including the same, capable of producing a fabric having coolness and quick-drying ability.

Recently, the textile industry is researching not only the improvement of polymers constituting fibers but also the differentiation of yarn cross-sections as part of the development of differentiated materials with high added value. Among them, the differentiation of yarn cross section is highly effective in terms of improvement of fiber properties compared to investment time and cost, and research is being actively conducted.

On the other hand, the standard of living has recently improved, and various sports activities are being performed by all generations regardless of age for healthy self-management. Accordingly, as the demand for sportswear increases, the development of various sportswear is being actively performed. In particular, there is an urgent need to develop textile materials for sportswear that can be widely used from light trekking to active sports activities by combining functionality such as light weight and breathability.

Accordingly, Republic of Korea Patent Registration No. 10-1808459 'Polyester with excellent quick-drying and abrasion resistance and manufacturing method thereof' and Korean Patent Publication No. 10-2011-0076122 'Polyester having excellent sweat-absorbing and quick-drying properties and stretch properties' Butylene terephthalate hetero-shaped cross-section fibers' are disclosed. Such deformed cross-section fibers (yarns) release the cross-section of the filament constituting the yarn to form voids in the yarn composed of filament bundles, and capillary action (accelerating the absorption rate through the microvoids) due to the microvoids formed between the filaments. by increasing the diffusion surface of water) to absorb and release moisture. That is, by using the capillarity within the yarn, the function of speeding up the absorption and dissipation of sweat, that is, the sweat perspiration and quick-drying ability was given.

However, the conventional deformed cross-section yarn has a disadvantage in that it has a poor water absorption rate compared to cotton yarn and does not sufficiently absorb sweat or breath excreted by a user wearing a product (fabric) manufactured from the deformed cross-section yarn. In addition, products manufactured from conventional shaped cross-section yarns have a problem in that, as the moisture absorption rate is low, the amount of moisture discharged to the outside is also small, making it difficult for the wearer to feel comfortable.

In addition, products manufactured from conventional shaped cross-section yarns can generate heat from the skin by increasing the coefficient of friction between the fabric and the skin when the human body is active due to moisture that is not discharged to the outside. Furthermore, conventional cross-section yarns are mostly polyester yarns, and as described above, there is no cooling sensation compared to conventional polyethylene fibers. Accordingly, there is a disadvantage in that the wearer may rather cause discomfort as the wearer feels more heat and discharges a large amount of sweat.

Accordingly, there is a further need to develop a new textile material that rapidly absorbs and discharges a large amount of moisture and has coolness.

An object of the present invention is to provide a modified cross-section polyethylene yarn capable of producing a fabric having coolness and sweat perspiration and quick drying ability, and a functional fabric including the same.

The polyethylene yarn according to the present invention contains a filament including a core and two or more protrusions protruding from the core, based on a cross section perpendicular to the longitudinal direction, and has a crystallinity of 56 to 85%.

In the polyethylene yarn according to an embodiment of the present invention, based on the cross section perpendicular to the longitudinal direction of the filament, the first radius (R1) of the inscribed circle formed by the core body in the core body, and the core body and the protrusion are formed The second radius R2 of the circumscribed circle may satisfy the following equation.

[ceremony]

1.2 ≤ R2/R1 ≤ 5.0

In the polyethylene yarn according to one embodiment of the present invention, the yarn may have a melt index (MI, @190 °C) of 1 to 25 g / 10 min measured at 190 ° C. 2.16 kg according to ASTM D1238.

In the polyethylene yarn according to an embodiment of the present invention, the yarn may have a polydispersity index (PDI) of 5 to 30.

In the polyethylene yarn according to an embodiment of the present invention, the yarn may have a strength of 5 to 10 g / d as measured by ASTM D2256.

The functional fabric according to the present invention includes the above-described polyethylene yarn.

In the functional fabric according to an embodiment of the present invention, the fabric is 20 ± 2 ℃, 65 ± 2% RH, by contacting a hot plate (T-box) of 30 ± 2 ℃ to the fabric of 20 ± 2 ℃ The measured contact cooling (Q-max) may be 0.1 to 0.5 W/cm ² .

In the functional fabric according to an embodiment of the present invention, the fabric may have a heat flux of 95 to 150 W/m ² measured at 20±2° C. and 65±2% RH.

In the functional fabric according to an embodiment of the present invention, the fabric may have a moisture absorption rate of 80 to 160 mm/10 min by the B method of KS K 0642 8.26.

In the functional fabric according to an embodiment of the present invention, the fabric may have a moisture drying rate of 20 to 50 mm/10 min according to the KS K 0642 8.25 A method.

The sweat perspiration and quick-drying product according to the present invention is manufactured from the functional fabric described above.

According to the modified cross-section polyethylene yarn according to the present invention, moisture can move and discharge quickly, and as it has excellent thermal conductivity, it is possible to manufacture a fabric having sweat perspiration, quick drying, and coolness at the same time.

In addition, the functional fabric according to the present invention includes a polyethylene yarn having excellent thermal conductivity and sweat perspiration and quick drying ability, so it has coolness and sweat perspiration and quick drying ability, quickly discharges moisture generated by sweat, moisture and breath, and heat can be released to the outside, thereby reducing the feeling of dampness and feeling of heat, thereby providing a sense of comfort to the user.

1 is a cross-sectional view of a filament of a modified cross-section polyethylene yarn according to a first embodiment of the present invention.

2 is a cross-sectional view of a filament of a modified cross-section polyethylene yarn according to a second embodiment of the present invention.

Figure 3 is a schematic diagram schematically showing a device for measuring the contact coolness of the fabric.

Figure 4 is a photograph showing a thermal mannequin experiment for measuring the heat flux of the fabric.

Figure 5 is an optical microscope picture showing an enlarged cross-section of the filament of the hetero-shaped cross-section polyethylene yarn shown in Figure 1.

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

In addition, the singular form used in this specification may be intended to include the plural form as well unless otherwise indicated in the context.

In addition, units used in this specification without special mention are based on weight, and as an example, the unit of % or ratio means weight% or weight ratio, and unless otherwise defined, weight% is any one component of the entire composition It means the weight percent occupied in the composition.

Further, as used herein, numerical ranges include lower and upper limits and all values within that range, increments logically derived from the shape and breadth of the defined range, all values defined therebetween, and the upper limit of the numerical range defined in a different form. and all possible combinations of lower bounds. Unless otherwise specifically defined in the specification of the present invention, values outside the numerical range that may occur due to experimental errors or rounding of values are also included in the defined numerical range.

The term 'comprising' in the present specification is an open description having the same meaning as expressions such as 'includes', 'includes', 'has' or 'characterized by', elements not additionally listed, No materials or processes are excluded.

Sweat perspiration and quick drying refers to quickly absorbing and drying moisture such as sweat, moisture, and breath, and is required in various fields to provide comfort to the human body, such as sportswear, work clothes, and masks.

Conventionally, the cross-section of the filaments constituting the yarn is demolded to form voids in the yarns composed of filament bundles, and the yarns are given absorbent and quick-drying properties through capillarity caused by microvoids formed between the filaments. However, the conventional deformed cross-section yarn has a disadvantage in that it has a poor water absorption rate compared to cotton yarn and does not sufficiently absorb sweat or breath excreted by a user wearing a product (fabric) manufactured from the deformed cross-section yarn. In addition, products manufactured from conventional shaped cross-section yarns have a problem in that, as the moisture absorption rate is low, the amount of moisture discharged to the outside is also small, making it difficult for the wearer to feel comfortable.

In addition, products manufactured from conventional shaped cross-section yarns can generate heat from the skin by increasing the coefficient of friction between the fabric and the skin when the human body is active due to moisture that is not discharged to the outside. Furthermore, conventional cross-section yarns are mostly polyester yarns, and as described above, there is no cooling sensation compared to conventional polyethylene fibers. Accordingly, there is a disadvantage in that a user wearing a product manufactured from a conventional cross-section yarn may rather cause discomfort as the user feels more heat and discharges a large amount of sweat.

Accordingly, the present applicant has conducted in-depth research for a long period of time to develop a high value-added yarn that can simultaneously have excellent sweat-absorbing and quick-drying performance and coolness. It was discovered that it was possible to manufacture a product capable of providing a very good feeling of comfort when worn by a user by providing a cooling sensation unique to polyethylene, and as a result of intensifying research on this, the present invention was completed.

The polyethylene yarn of the present invention contains a filament comprising a core body and two or more projections protruding from the core body, based on a cross section perpendicular to the longitudinal direction, and has a crystallinity of 56 to 85%, specifically 60 to 85%, More specifically, it may be 65 to 75%.

Such a polyethylene yarn has a structure in which a plurality of filaments having a specific cross-section are bundled, and due to the cross-sectional structure of the filaments, fine voids are formed between the filaments in the yarn, and moisture is generated by capillarity caused by the fine voids. Absorption and discharge of can be performed smoothly. In addition, as it has excellent thermal conductivity unique to polyethylene, it is possible to manufacture a fabric having sweat perspiration, quick drying and coolness at the same time.

1 is a filament of a polyethylene yarn according to an embodiment of the present invention is shown.

Referring to FIG. 1, a polyethylene yarn includes a filament including a core body and two or more protrusions protruding from the core body, based on a cross section perpendicular to the longitudinal direction, and as described above, such a cross section is released. As the filaments are included, fine voids may be formed between the filaments in the yarn.

In one aspect of the present invention, the filaments constituting the polyethylene yarn are non-porous, and pores may be formed in the polyethylene yarn only by spacing between the filaments. That is, the porosity of the polyethylene yarn may be formed by fine pores between the filaments. Specifically, in a direction perpendicular to the length direction of the polyethylene yarn, the area occupied by the filament based on the cross section of the yarn measured along the outer shape of the yarn may be 50 to 99%, specifically 60 to 90%, and the area excluding this is the area where voids are formed in the yarn, and may be the cross-sectional porosity of the yarn. As such, the polyethylene yarn having a high porosity due to the fine pores formed between the filaments may maintain a high cooling sensation characteristic of polyethylene and at the same time rapidly absorb and dry moisture.

Specifically, the centrosome may have various cross-sectional shapes such as polygons such as triangles, squares, and pentagons, ellipses, or circulars based on a cross section perpendicular to the longitudinal direction of the filaments, but preferably, as shown in FIG. 1, circular or It has a cross-sectional shape close to circular and can form an average radius length. At this time, in a cross section perpendicular to the longitudinal direction of the filament, the radius formed by the center body means an inscribed circle of the filament.

Alternatively, as shown in FIG. 2, the center body may have an elliptical shape based on a cross section perpendicular to the longitudinal direction of the filament. At this time, in the cross section perpendicular to the longitudinal direction of the filament, the radius formed by the center body means the inscribed circle of the filament, but since the inscribed circle is an ellipse, it may be any one selected from the short radius and the long radius of the ellipse. Preferably, it may mean a long radius.

The protrusion is formed by protruding from the center body based on a cross section perpendicular to the longitudinal direction of the filament, and the filament including the protrusion has a shape in which the cross section perpendicular to the longitudinal direction is deformed. In the yarn including such filaments, fine voids are formed between the filaments, and a channel through which moisture can be absorbed through capillary action, that is, microchannels (micro voids) are formed. Thus, the yarn can absorb and discharge moisture through the microchannel, so it can have excellent sweat perspiration and quick drying performance.

The projection is not limited as long as it protrudes from the center body, but may have a gently protruding end in a round shape. The protrusion is not limited in size that can separate the filaments in the yarn to the extent that moisture can be absorbed through capillary action, that is, the length protruding from the core body.

However, based on the cross section perpendicular to the longitudinal direction of the yarn or filament, the first radius R1 of the inscribed circle formed by the core body and the second radius R2 of the circumscribed circle formed by the core body and the protrusion are ) satisfies the following formula, which is advantageous in terms of water absorbing power by capillarity.

[ceremony]

1.2 ≤ R2/R1 ≤ 5.0

More specifically, in the above formula, 1.2 ≤ R2/R1 ≤ 3.5 or 1.3 ≤ R2/R1 ≤ 3. Within this range, even though polyethylene is hydrophobic, water absorption of the yarn may occur smoothly due to strong capillary force.

In addition, in the cross section perpendicular to the longitudinal direction of the filament, the length ratio occupied by one projection with respect to the circumference of the inscribed circle of the filament formed by the core body may be 10% or more, specifically 20 to 50%. At this time, the length occupied by the projection means the length of an arc connecting both ends of the projection and each contact point of the inscribed circle in the circumference of the inscribed circle. Specifically, in Figure 1,

can mean

Two or more protrusions, specifically 2 to 5 may be provided. Preferably, when the central body is circular, it is provided in three, so that the cross section of the filament perpendicular to the longitudinal direction is formed in a three-lobed shape, so that the size of the microchannel can be easily adjusted by adjusting the length of the inscribed circle and the circumscribed circle.

Alternatively, when the centrosome is elliptical, it may be advantageous in controlling the size of the microchannel that the filament is provided in four, and the cross section of the filament perpendicular to the longitudinal direction is formed in a quadrangular shape.

The protrusions may be arranged at equal intervals from each other along the circumferential direction of the centrosome, but are not limited thereto. For example, as shown in FIG. 1, when three protrusions are provided, they may be arranged at equal intervals along the circumferential direction of the center body, but, on the other hand, when two protrusions are provided, the protrusions are biased to one side of the center body. can be located.

Alternatively, as shown in FIG. 2, when provided with four protrusions, a pair of protrusions may be arranged symmetrically with each other based on the elliptical center body.

As described above, since a plurality of protrusions protrude from the core body, the area ratio occupied by the protrusions with respect to the entire area of one surface of the core body on which the protrusions are formed is preferably 60% or more, specifically 80 to 100%. At this time, 100% means that the protrusions are continuously formed on the entire area of one surface of the centrosome. Specifically, as shown in FIG. 1, the ends of adjacent protrusions are located in contact with each other, and based on a cross section perpendicular to the longitudinal direction of the filament, the filament cross-sectional shape may be a wave along the circumferential direction of the filament.

Such a polyethylene yarn is a bundle of a plurality of filaments having a release cross section as described above, and the area occupied by the filaments based on the cross section perpendicular to the longitudinal direction is 70 to 99%, more specifically 80 to 95%. The area other than the area occupied by the filaments may refer to an area occupied by the micropores or an area formed by the microchannels. Within the above range, the microchannel may have sufficient water absorption and discharge capabilities.

A polyethylene yarn may include multiple filaments. The yarn is not limited as long as the number of filaments capable of forming fine pores. For example, the polyethylene yarn 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.

In addition, the polyethylene yarn may have a density of 0.90 to 0.99 g/cm ³ , or 0.93 to 0.97 g/cm ³ . In addition, the polyethylene yarn may have a crystallinity of 56 to 85%, specifically 60 to 85%, and more specifically 65 to 75% through spinning, and may exhibit a uniform crystallinity from the center to the outer edge of the polyethylene yarn. The crystallinity of the polyethylene yarn may be derived together with the crystallite size during crystallinity analysis using an X-ray diffractometer. In the range where the crystallinity satisfies the above range, heat is rapidly diffused and dissipated through lattice vibration called 'phonon' in the direction of molecular chains connected through covalent bonds of high-density polyethylene (HDPE), and sweat and breath It is possible to provide a fabric with excellent cooling sensation by improving the moisture release function of the back. In particular, the polyethylene yarn according to one embodiment is hollow, has a higher crystallinity per unit volume than the hollow yarn, and can contain more crystal parts when the yarn has substantially the same thickness, which is the object of the present invention Fabrics having excellent coolness can be manufactured.

In addition, the polyethylene yarn has a melt index (MI, @190 ℃) measured at 190 ℃ 2.16 kg according to ASTM D1238, 1 to 25g / 10min, specifically, 3 to 15g / 10min, more specifically, It may be 5 to 10g/10min, but is not limited thereto. However, it may have relatively excellent strength within the above range.

In addition, the polydispersity index of the polyethylene yarn may be 5 to 30, specifically 10 to 20. At this time, the strength measured according to ASTM D2256 may be 5 to 10 g/d, specifically 6 to 9 g/d, and more specifically, 7 to 8 g/d. It may have high thermal conductivity in the above range and at the same time have appropriate stiffness advantageous to weaving.

Hereinafter, a method for producing a polyethylene yarn according to an aspect of the present invention will be described in detail with reference to FIG. 1 . The polyethylene yarn of the present invention is not limited to its manufacturing method as long as it satisfies the above ranges of physical properties such as PDI, strength and elongation, and the following will describe one aspect.

First, a polyethylene melt is obtained by introducing polyethylene in the form of a chip into an extruder 100 and melting it.

Molten polyethylene is carried through the nozzle 100 by a screw (not shown) in the extruder 100 and is extruded through a plurality of holes formed in the nozzle 200 . The number of holes of the spinneret 200 may be determined according to the Denier Per Filament (DPF) and fineness of the yarn to be manufactured. For example, when manufacturing a yarn having a total fineness of 75 denier, the nozzle 200 may have 20 to 75 holes, and when manufacturing a yarn having a total fineness of 450 denier, the nozzle 200 It may have 90 to 450 holes, preferably 100 to 400 holes.

The melting process in the extruder 100 and the extrusion process through the nozzle 200 can be changed according to the melt index of the polyethylene chip, but specifically, for example, 150 to 315 ° C, preferably 250 to 315 °C, more preferably at 265 to 310 °C. That is, it is preferable that the extruder 100 and the cap 200 be maintained at 150 to 315°C, preferably 250 to 315°C, and more preferably 265 to 310°C.

When the spinning temperature is less than 150° C., the spinning may be difficult because the polyethylene is not uniformly melted due to the low spinning temperature. On the other hand, if the spinning temperature exceeds 315 ° C., thermal decomposition of polyethylene may occur, and thus desired strength may not be expressed.

As the molten polyethylene is discharged from the holes of the deformed cross-section mold 200, the solidification of the polyethylene starts due to the difference between the spinning temperature and the room temperature, and the filaments 11 in a semi-solidified state are formed. In the present specification, both fully solidified filaments as well as semi-solidified filaments are collectively referred to as "filaments".

The plurality of filaments 11 are completely solidified by being cooled in a cooling unit (or "quenching zone") 300 . Cooling of the filaments 11 may be performed by air cooling.

The cooling of the filaments 11 in the cooling unit 300 is preferably performed to be cooled to 15 to 40° C. using a cooling wind having a wind speed of 0.2 to 1 m/sec. If the cooling temperature is less than 15 ° C, elongation may be insufficient due to supercooling and thread breakage may occur during the stretching process, and if the cooling temperature exceeds 40 ° C, the fineness deviation between the filaments 11 increases due to uneven solidification, rejection may occur.

In addition, by performing multi-stage cooling during cooling in the cooling unit, it is possible to crystallize more uniformly, and accordingly, it is possible to more smoothly discharge moisture and sweat, and to manufacture a yarn having excellent coolness. More specifically, the cooling unit may be divided into two or more sections. For example, when it consists of three cooling sections, it is preferable to design such that the temperature gradually decreases from the first cooling section to the third cooling section. Specifically, for example, the first cooling unit may be set to 40 to 80°C, the second cooling unit may be set to 30 to 50°C, and the third cooling unit may be set to 15 to 30°C.

In addition, by setting the wind speed to the highest in the first cooling unit, fibers having a smoother surface can be produced. Specifically, the first cooling unit may use cooling wind at a speed of 0.8 to 1 m/sec, the second cooling unit at 0.4 to 0.6 m/sec, and the third cooling unit at a wind speed of 0.2 to 0.5 m/sec. is higher, and a yarn with a smoother surface can be produced.

Then, the multifilaments 10 are formed by concentrating the cooled and completely solidified filaments 11 with a collimator 400 .

As illustrated in Figure 1, the polyethylene yarn of the present invention can be produced through a direct spinning stretching (DSD) process. That is, the multifilament 10 is directly transferred to the multi-stage stretching unit 500 including the plurality of godet roller units GR1 ... GRn and multi-stage stretching at a total stretching ratio of 2 to 20, preferably 3 to 15 times. After being, it can be wound around the winder 600. In addition, by giving 1 to 5% contraction stretching (relaxation) in the last stretching section during multi-stage stretching, it is possible to provide a yarn with more excellent durability.

Alternatively, the polyethylene yarn of the present invention may be produced by first winding the multifilament 10 as an undrawn yarn and then drawing the undrawn yarn. That is, the polyethylene yarn of the present invention may be manufactured through a two-step process of first preparing an undrawn yarn by melt-spinning polyethylene and then drawing the undrawn yarn.

If the total draw ratio applied in the drawing process is less than 2, the finally obtained polyethylene yarn cannot have a crystallinity of 56% or more and 60% or more, and there is a risk of causing fluff (pilling) on the fabric made of the yarn.

On the other hand, if the total draw ratio exceeds 15 times, there is a possibility of yarn breakage, and the strength of the finally obtained polyethylene yarn is not suitable, so that the weaving property of the polyethylene yarn is not good, and the fabric manufactured using it is too stiff. Users may feel uncomfortable.

When the linear speed of the first godet roller part (GR1) that determines the spinning speed of the melt spinning of the present invention is determined, the total draw ratio of 2 to 20, preferably 3 to 15 in the multi-stage stretching unit 500 is the multi-stage stretching unit 500. The linear speed of the remaining godet roller portions is appropriately determined so as to be applied to the filament 10 .

According to one embodiment of the present invention, the temperature of the godet roller parts (GR1 ... GRn) of the multi-stage stretching unit 500 is appropriately set in the range of 40 to 140 ° C. Heat-setting of the yarn may be performed. Specifically, for example, the multi-stage stretching unit may be composed of 3 or more, specifically 3 to 5 stretching sections. In addition, each stretching section may be composed of several godet roller parts.

Specifically, for example, the multi-stage stretching unit may be composed of four stretching sections, and after stretching at a total stretching ratio of 7 to 15 times in the first to third stretching sections, 1 to 3% contraction stretching in the fourth stretching section. It may be to perform (relaxation). The total draw ratio refers to the final draw ratio of fibers that have passed through the third drawing section from the first drawing section compared to the fibers before drawing.

More specifically, the first stretching section may be performed at 40 to 130 ° C., and the total stretching ratio may be 2 to 5 times. The second stretching section may be performed at a higher temperature than the first drawing section, specifically at 100 to 150° C., and may be stretching so that the total stretching ratio is 5 to 8 times. The third stretching section may be carried out at 100 to 150 ° C., and may be stretching so that the total stretching ratio is 7 to 15 times. The fourth stretching section may be performed at a temperature equal to or lower than that of the second drawing section, and may be specifically performed at 80 to 140° C., and 1 to 3% contraction stretching (relaxation) may be performed.

Multi-stage stretching and heat setting of the multi-filament 10 are simultaneously performed by the multi-stage stretching unit 500, and the multi-stage stretching multi-filament 10 is wound around the winder 600, thereby completing the polyethylene yarn of the present invention.

The functional fabric according to the present invention includes the above-described polyethylene yarn, and has excellent thermal conductivity and sweat perspiration and quick-drying ability, as it includes polyethylene yarn, and has a cool feeling and sweat perspiration and quick-drying ability. Moisture can be drained quickly. When a user wears a product made of such a fabric, moisture and heat can be quickly released to the outside, thereby reducing a damp feeling and a feeling of heat, thereby providing a pleasant feeling to the user.

The functional fabric according to the present invention may be one using the above-described polyethylene yarn alone, and may further include heterogeneous yarns to further impart other functionalities, but from the viewpoint of having better coolness and quick-drying ability at the same time. In, it is preferable to use the polyethylene yarn alone.

Specifically, the functional fabric may have a contact cooling sensation of 0.1 to 0.5 W/cm ² , more specifically 0.15 to 0.3 W/cm ² measured at 20±2° C. and 65±2% RH. In addition, the functional fabric may have a heat flux of 95 to 150W/m ² , specifically, 100 to 120W/m ² measured at 20±2° C. and 65±2% RH. When such a functional fabric having a cool feeling is subsequently manufactured or processed into a product and worn by a user, it can provide an excellent cool feeling that allows the user to feel comfortable under a high-temperature environment.

In addition, the functional fabric may have a water absorption rate of 80 to 160 mm / 10 min, specifically, 100 to 130 mm / 10 min according to the B-birec method of KS K 0642 8.26. Such a functional fabric has a higher moisture absorption rate than cotton yarn having a moisture absorption rate of around 50 mm/10 min under the same conditions, and has a very excellent moisture absorption capacity.

In addition, the functional fabric has a relatively fast moisture drying rate of 20 to 50 mm/10 min, specifically 30 to 40 mm/10 min according to the KS K 0642 8.25 A method, and the moisture can be smoothly discharged. As such, the functional fabric exhibiting a fast moisture absorption rate and a moisture drying rate is very excellent in sweat perspiration and quick drying ability to quickly absorb and discharge moisture such as sweat, moisture, and breath.

The functional fabric may be a woven or knitted fabric having a weight per unit area (ie, areal density) of 150 to 800 g/m ² . If the areal density of the fabric is less than 150 g/m ² , the denseness of the fabric is insufficient and many voids exist in the fabric, and these voids reduce the coolness of the fabric. On the other hand, when the areal density of the fabric exceeds 800 g/m ² , the fabric becomes stiff due to an overly dense fabric structure, problems occur in the tactile feeling experienced by the user, and problems in use are caused due to the high weight.

Such a fabric can be processed into a sweat-absorbing and quick-drying product requiring both sweat-absorbing and quick-drying properties and coolness. The product may be any conventional textile product, but preferably may be summer summer clothes, sportswear, masks, and work clothes for imparting coolness and quick-drying performance to the human body.

As described above, the present invention has been described by specific details and limited embodiments and drawings, but this is only provided to help a more general understanding of the present invention, the present invention is not limited to the above embodiments, and the present invention Those skilled in the art can make various modifications and variations from these descriptions.

Therefore, the spirit of the present invention should not be limited to the described embodiments, and it will be said that not only the claims to be described later, but also all modifications equivalent or equivalent to these claims belong to the scope of the present invention. .

[Measurement of yarn properties]

<1. Weight Average Molecular Weight (Mw) (g/mol) and Polydispersity Index (PDI)>

After completely dissolving the polyethylene yarn in the solvent below, the weight average molecular weight (Mw) and polydispersity index (Mw/Mn: PDI) of the polyethylene yarn were obtained using the following gel permeation chromatography (GPC), respectively.

- Analysis device: 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 ° C

- Solvent: Trichlorobenzene (TCB) + 0.04 wt.% Dibutylhydroxytoluene (BHT) (after drying with 0.1% CaCl ₂ )

- Injector, detector temperature: 160℃

- Detector: RI Detector

- Flow rate: 1.0 ml/min

- Injection amount: 300 μl

- Sample concentration: 1.5mg/mL

- Standard sample: polystyrene

<2. Intensity (g/d)>

*According to the ASTM D2256 method, strain-stress curves of polyethylene yarns were obtained using a universal tensile tester manufactured by Instron Engineering Corp., Canton, Mass. The sample length was 250 mm, the tensile speed was 300 mm/min, and the initial load was set to 0.05 g/d. The strength (g/d) was obtained from the stress and elongation at the breaking point. After measuring 5 times for each yarn, the average value was calculated.

<3. Crystallinity>

The crystallinity of the polyethylene yarn was measured using an XRD device (X-ray Diffractometer) [manufacturer: PANalytical, model name: EMPYREAN]. Specifically, a sample having a length of 2.5 cm was prepared by cutting a polyethylene yarn, and the sample was fixed to a sample holder and then measured under the following conditions.

- Light Source (X-ray Source): Cu-Kα radiation

- Power: 45 KV x 25 mA

- Mode: Continuous scan mode

- Scan angle range: 10 to 40°

- Scan speed: 0.1°/sec

<4. Melt Index>

Measured at 190 °C and 2.16 kg according to ASTM D1238.

[Measurement of fabric properties]

<1. contact coldness>

Requested by the Korea Apparel Testing & Research Institute, it was measured in a test environment of 20 ± 2 ° C and 65 ± 2 % R.H using a KES-F7 (Thermo Labo II) device.

Specifically, after preparing a fabric sample having a size of 20 cmХ20 cm, it was left for 24 hours under conditions of a temperature of 20 ± 2 ° C and an RH of 65 ± 2%. Subsequently, the contact cooling (Q max) of the fabric was 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 fabric sample 23 is placed on a base plate (also referred to as a 'Water-Box') 21 maintained at 20 ° C, and the fabric sample 23 is heated to 30 ° C. Box 22a (contact area: 3cmХ3cm) was placed on the fabric sample 23 for only 1 second. That is, the other surface of the fabric sample 23, one surface of which is 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 6 gf/cm ² . Subsequently, 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 average of the Q max values was calculated.

<2. heat flux>

After placing the thermal manikin in an artificial climate room, it was measured in a test environment of 20±2° C. and 65±2% R.H.

Specifically, as illustrated in FIG. 4, a male thermal mannequin was placed in the center of an artificial climate room at 20±2° C. and 65±2% R.H. Then, after setting the thermal mannequin temperature to 33.7 ° C., power was supplied to heat the thermal mannequin.

Then, after preparing a sample of male 95 size top, put it on a heated thermal mannequin and measure the surface temperature of the thermal mannequin for 30 minutes at 1 minute intervals and the power value for maintaining the temperature of the thermal mannequin Unit for a unit time (1 min) The heat flux (W/m ² ), which is the amount of heat energy consumed per area (1 m ² ), was measured.

<3. Moisture Absorption Rate>

Through the KS K 0642 8.26 B method (Byrek method), the moisture absorption rate of the fabric was measured.

Specifically, after preparing five identical fabric samples with a size of 20 cmХ2.5 cm, one end of the sample was brought into contact with the surface of a container containing distilled water at 20 ± 2 ° C and fixed with a horizontal bar at a constant height. After 10 minutes, the height at which the water rises was measured by capillarity and expressed as an average value.

<4. Moisture Drying Rate>

Through the KS K 0642 8.25 A method, the moisture drying rate of the fabric was measured.

Specifically, after preparing three test pieces with a size of 4 cm Х4 cm, they were immersed in distilled water at 20 ± 2 ° C in an open state to sufficiently absorb moisture into the test pieces. Then, when the water droplets no longer fall after being taken out of the distilled water, it is attached to a drying time measuring device and left in the test room under conditions of 20 ± 2 ° C and 65 ± 2% R.H. The time from natural drying to constant weight was measured.

[Example 1]

<Manufacture of polyethylene yarn>

* A polyethylene yarn containing 200 filaments and having a total fineness of 150 denier was prepared.

First, polyethylene chips were put into the extruder 100 and melted. Molten polyethylene was extruded through a nozzle 200 with 200 holes. The detention temperature was 270°C. At this time, the nozzle of the nozzle was "Y" type.

The filaments 11 formed while being discharged from the nozzle holes of the nozzle 200 are cooled to 50° C. by a cooling wind at a wind speed of 0.9 m/sec in the first cooling unit and at a wind speed of 0.5 m/sec in the second cooling unit. It was cooled to 35 ° C by the cooling wind of , and finally cooled to 25 ° C by the cooling wind of 0.4 m / sec wind speed in the third cooling unit. After cooling, it was collected into a multifilament yarn by a collimator.

Subsequently, the multifilament yarn moved to the stretching unit 500 . The stretching unit is composed of a multi-stage stretching unit consisting of four sections. Specifically, the first stretching section is stretched at a maximum stretching temperature of 80 ° C. and the total stretching ratio is 3 times, and the second stretching section is at a maximum stretching temperature of 120 ° C. and the total stretching ratio is 7 times. The third stretching section is stretched at a maximum stretching temperature of 130 ° C and the total stretching ratio is 10 times, and the fourth stretching section is 2% shrinkage (relaxation) compared to the third stretching section at a maximum stretching temperature of 120 ° C. Stretching and heat Fixed.

Subsequently, the stretched multifilament yarn was wound around the winder 600 . The winding tension was 0.8 g/d.

A cross-sectional optical micrograph of the prepared yarn is shown in FIG. 5, and the physical properties of the prepared yarn are measured and shown in Table 1 below.

<Manufacture of functional fabric>

A functional fabric having an areal density of 500 g/m ² was prepared by weaving the prepared polyethylene yarn. The physical properties of the prepared functional fabric were measured and shown in Table 3 below.

[Examples 2 to 5]

A fabric was prepared in the same manner as in Example 1, except that yarn conditions were changed as shown in Table 1 below. In addition, the physical properties of the fabric prepared in the same manner as in Example 1 were measured and are shown in Table 3 below.

[Example 6]

In Example 1, yarn and fabric were prepared in the same manner as in Example 1, except that a ">-<" type nozzle was used as the nozzle nozzle. In addition, the physical properties of the prepared yarns and fabrics were measured and shown in Tables 1 and 3 below.

[Comparative Example 1]

In Example 1, yarn and fabric were prepared in the same manner as in Example 1, except that a circular nozzle was used as the nozzle nozzle. The physical properties of the yarn were shown in Table 2 below, and also, the physical properties of the fabric prepared in the same manner as in Example 1 were measured and shown in Table 4 below.

[Comparative Example 2]

After preparing a polyethylene terephthalate (PET) fiber having the same cross-sectional shape and size as in Example 1, a fabric was prepared in the same manner as in Example 1. The physical properties of the yarn are shown in Table 2 below, and the physical properties of the fabric prepared in the same manner as in Example 1 are measured and shown in Table 4 below.

[Comparative Example 3]

After preparing a polyethylene terephthalate (PET) fiber having the same cross-sectional shape and size as in Example 1 and adding titanium dioxide (TiO ₂ ) as an absorbent additive, a fabric was prepared in the same manner as in Example 1. The physical properties of the yarn are shown in Table 2 below, and the physical properties of the fabric prepared in the same manner as in Example 1 are measured and shown in Table 4 below.

[Comparative Example 4]

In Example 1, a yarn was prepared in the same manner as in Example 1, except that the stretching process of the polyethylene yarn was changed from multi-stage stretching to single stretching so that the crystallinity satisfies Table 2 below, and the physical properties of the fabric were measured. It is shown in Table 4 below.

[Comparative Example 5]

In Example 1, except for changing the cooling process of the polyethylene yarn from multi-stage cooling to single cooling (cooling to 25 ° C. by cooling wind at a wind speed of 0.5 m / sec) so that the crystallinity satisfies Table 2 below, Example Yarn was prepared in the same manner as in 1, and the physical properties of the fabric were measured and shown in Table 4 below.

division		Example 1	Example 2	Example 3	Example 4	Example 5	Example 6
Properties of polyethylene yarn	PDI	9.82	10.11	10.23	9.74	9.88	9.71
	Mw (g/mol)	311654	308542	313451	316321	309991	315642
	Crystallinity (%)	75.2	75.7	74.1	74.9	75.3	75.1
	melt index (g/10min)	10.1	9.8	11.2	10.5	10.4	10.5
	Strength (g/d)	7.5	8.2	7.8	7.4	7.3	7.6
filament section	shape	three-lobed	three-lobed	three-lobed	three-lobed	three-lobed	four-lobed
	R2/R1 ratio	2.81	3.10	2.12	2.24	2.79	2.36

		Comparative Example 1	Comparative Example 2	Comparative Example 3	Comparative Example 4	Comparative Example 5
yarn properties	Material	PE	PET	PET+TiO 2	PE	PE
	Crystallinity (%)	75.2	48.7	48.7	55.1	55.7
	Strength (g/d)	11.5	3.4	3.5	7.4	7.5
yarn cross section	section shape	circle	three-lobed	three-lobed	three-lobed	three-lobed
	section R2/R1 ratio	-	1.65	1.78	1.98	1.91

		Example 1	Example 2	Example 3	Example 4	Example 5	Example 6
Physical properties of functional fabrics	coldness to the touch (W/cm 2 )	0.2	0.19	0.18	0.17	0.18	0.21
	Heat flux (W/m 2 )	115	102	107	114	109	114
	Water absorption rate (mm/min)	125	108	107	115	112	127
	Moisture drying speed (mm/min)	32	28	26	30	34	31

		Comparative Example 1	Comparative Example 2	Comparative Example 3	Comparative Example 4	Comparative Example 5
Physical properties of functional fabrics	Contact coolness (W/cm 2 )	0.2	0.12	0.13	0.10	0.11
	Heat flux (W/m 2 )	114	80	90	87	85
	water absorption rate (mm/min)	45	99	101	111	112
	Moisture drying speed (mm/min)	11	24	27	30	25

Referring to Tables 1 to 4, it was confirmed that the fabrics prepared from the yarns according to the embodiments of the present invention had high contact coolness and excellent sweat perspiration and quick drying performance. Through this, the fabric manufactured from the yarn according to the embodiment can provide significantly superior cooling sensation to the user. On the other hand, in the case of the fabric according to Comparative Example 1, the contact cooling sensation was similar to that of the examples, but the moisture absorption rate and the moisture drying rate were low, so the moisture was not quickly removed, and the cooling sensation felt by the user was poor.

In the case of Comparative Examples 2 to 3, contact cooling sensation, heat flux, moisture absorption, and drying rate were all low, so it was confirmed that the possibility of utilization as a product having a cool feeling product and a sweat perspiration quick drying ability was very low.

As described above, the present invention has been described by specific details and limited embodiments and drawings, but this is only provided to help a more general understanding of the present invention, the present invention is not limited to the above embodiments, and the present invention Those skilled in the art can make various modifications and variations from these descriptions.

Therefore, the spirit of the present invention should not be limited to the described embodiments, and it will be said that not only the claims to be described later, but also all modifications equivalent or equivalent to these claims belong to the scope of the present invention. .

[Description of code]

1: filament 10: centrosome

10a: inscribed circle 30: protrusion

30a: circumcircle

Claims (11)

1. Based on the cross section perpendicular to the longitudinal direction,

   Containing a centrosome and filaments including two or more projections protruding from the centrosome,

   A polyethylene yarn having a crystallinity of 56 to 85%.
2. According to claim 1,

   Based on the cross section perpendicular to the longitudinal direction of the filament,

   The first radius (R1) of the inscribed circle formed by the core body in the core body and the second radius (R2) of the circumscribed circle formed by the core body and the projections satisfy the following formula, polyethylene yarn.

   [ceremony]

   1.2 ≤ R2/R1 ≤ 5.0
3. According to claim 1,

   The yarn has a melt index (melt index: MI, @190 ℃) measured at 190 ℃ 2.16 kg according to ASTM D1238 of 1 to 25g / 10min, polyethylene yarn.
4. According to claim 1,

   The yarn has a polydispersity index (PDI) of 5 to 30, polyethylene yarn.
5. According to claim 1,

   The yarn has a strength of 5 to 10 g / d as measured by ASTM D2256, a polyethylene yarn.
6. A functional fabric comprising the yarn of any one of claims 1 to 5.
7. According to claim 6,

   The fabric has a contact cooling sensation (Q-max) of 0.1 to 0.5 W / cm ² measured at 20 ± 2 ℃, 65 ± 2% RH, functional fabric.
8. According to claim 6,

   The fabric has a heat flux of 95 to 150 W/m ² measured at 20 ± 2 °C and 65 ± 2% RH, functional fabric.
9. According to claim 6,

   The fabric has a water absorption rate of 80 to 160 mm / 10 min according to the B method of KS K 0642 8.26, a functional fabric.
10. According to claim 6,

    The fabric has a moisture drying rate of 20 to 50mm/10min according to KS K 0642 8.25 A method, functional fabric.
11. A sweat-absorbing and quick-drying product manufactured from the functional fabric of claim 6.

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