TWI816291B - Dope dyed polyethylene yarn and functional fabric including the same - Google Patents

Abstract

The present invention relates to a dope dyed polyethylene yarn and a functional fabric including the same, and more particularly, to a dope dyed polyethylene yarn having excellent color uniformity and a functional fabric including the same. A dope dyed polyethylene yarn according to the present invention contains a pigment, wherein L*, a* and b* measured under the following measurement condition satisfy the following expression: [Measurement condition] a measurement region is formed by winding the dope dyed polyethylene yarn around a planar substrate, computer color matching (CCM) is measured in the measurement region, and the CCM is measured at least n times (n is a natural number of 50 or more) every time the dope dyed polyethylene yarn is wound around the substrate 70 turns,

wherein C_max, C_min, and C_aver represent maximum, minimum, and average values of any one selected from L*, a*, and b*, respectively.

Description

Solution-dyed polyethylene yarn and functional fabrics containing the same

The following disclosure relates to a dope-dyed polyethylene yarn and a functional fabric comprising a dope-dyed polyethylene yarn, and more specifically, to a dope-dyed polyethylene yarn with excellent color uniformity and a dope-dyed polyethylene yarn comprising a dope-dyed polyethylene yarn. Functional fabric made of polyethylene yarn.

High-density polyethylene (HDPE) yarn refers to high-strength polyethylene yarn with a density of 0.94 grams/cubic centimeter or greater than 0.94 grams/cubic centimeter. High-density polyethylene yarn has been used in a variety of materials requiring high strength for sports ropes, fishing lines, protective clothing, body armor, stab-proof clothing and the like, and is also used in various composite materials requiring ultra-high strength.

In addition, high-density polyethylene yarn has high thermal conductivity through lattice vibrations called phonons and has excellent brightness because it has a specific gravity of about 0.93 and is light enough to float on water.

Therefore, high-density polyethylene yarn has been widely used in summer clothes, work clothes, sportswear and the like that require a cool feeling, as well as fabric products that require high strength, such as sports ropes, fishing lines, protective clothing, body armor and stab-proof clothing.

However, high-density polyethylene yarn is called flame-retardant fiber because it is made of high The hydrophobicity caused by crystallinity makes dyeing almost impossible even with any dye used in the dyeing system.

Two types of coloring methods are currently used to dye HDPE yarns. One is a doping dyeing method in which spinning is performed by adding pigments, and the other is a polymer blending method in which different dyeable polymers are mixed.

However, the disadvantage of solution-dyed polyethylene yarns produced by polymer blending is that it is difficult to maintain the specific physical properties of high-density polyethylene yarns, such as high thermal conductivity and brightness, due to the mixing of polyethylene yarns with different physical properties other than polyethylene. properties of polymers.

Therefore, as disclosed in Korean Patent No. 10-1992444 "Method of Manufacturing Dope Dyed Polyethylene Multi-Filament False-Twist Yarn", pigments are added by melt spinning Solution-dyed polyethylene yarns produced by doping dyeing of masterbatch wafers have been used in prior art.

However, in the dope-dyed polyethylene yarn according to the prior art, it is difficult for the pigment to be uniformly mixed with the polyethylene having a relatively high viscosity, and due to the non-uniformity of mixing between the pigment and the polyethylene raw material, the spinning Color unevenness is severe. Therefore, the quality is degraded due to the non-uniformity of the solution-dyed yarn itself, and the physical properties of the spun yarn, such as strength, are deteriorated due to the addition of a large amount of pigment in order to express the desired color. In addition, the quality of the final products manufactured using spun yarns also degrades.

[Prior technical literature]

[Patent Document]

(Patent Document 1) Korean Patent No. 10-1992444

Embodiments of the present invention are directed to providing a solution-dyed polyethylene yarn with excellent color uniformity and a functional fabric comprising a solution-dyed polyethylene yarn.

In a general aspect, solution-dyed polyethylene yarn contains pigments, wherein L*, a* and b* measured under the following measurement conditions satisfy the following expression:

[Measurement conditions]

A measurement area is formed by winding solution-dyed polyethylene yarn around a planar substrate. Computer color matching (CCM) is measured in the measurement area, and each time 70 turns of solution-dyed polyethylene yarn are wound around the substrate , measure CCM at least n times (n is 50 or a natural number greater than 50),

Among them, C _max , C _min and C _aver respectively represent the maximum value, minimum value and average value of any one selected from L*, a* and b*.

When measuring the CCM of dope-dyed polyethylene yarn, the standard deviation of the L* value can be 3 or less.

The pigment may be contained in an amount of 0.00005% by weight to 1% by weight relative to the total weight of the solution-dyed polyethylene yarn.

The crystallinity of solution-dyed polyethylene yarn can range from 60% to 80%.

When measured according to ASTM D2256, solution-dyed polyethylene yarn can have an initial modulus of 50 centinewtons per decitex (cN/dtex) to 300 cN/dtex and an initial modulus of 4 grams per denier (g/d) to 20 Strength in grams/denier.

When measured according to ASTM D1238, solution-dyed polyethylene yarn can have a melt index (MI, @190℃).

Solution-dyed polyethylene yarn can have a dry heat shrinkage of 2% to 15% (@100℃) when measured according to ASTM D4974-04.

In another common aspect, solution-dyed polyethylene yarn is used to create functional fabrics.

When measured by bringing a heating plate (T box) at 30±2℃ into contact with the functional fabric at 20±2℃ at 20±2℃ and 65±2% R.H, the functional fabric can have 0.1 Watt/cm² to 0.3 Watt/cm² contact cooling sensation.

When measured by bringing a heat source plate (BT box) at 30±2℃ into contact with the functional fabric at 20±2℃ at 20±2℃ and 65±2% R.H., the functional fabric can be in thickness It has a thermal conductivity of 0.05 Watts/meter Kelvin (W/mK) to 0.25 Watts/meter Kelvin in the direction.

As explained above, the polyethylene yarn according to the present invention has excellent color uniformity such that the coloring characteristics can be excellent compared to a certain amount of pigment added.

Furthermore, despite the addition of pigments, the polyethylene yarn according to the present invention can maintain the inherently excellent thermal conductivity of high-density polyethylene, allowing the production of fabrics with an excellent cooling feel.

In addition, the functional fabric according to the present invention includes polyethylene yarn with excellent color uniformity and excellent thermal conductivity, so that the functional fabric can have excellent coloring characteristics and color uniformity, and can have a cool feeling.

10:Multifilament

11:Filament

21: Bottom plate

22a:Heating plate

22b: Heat source plate

23: Fabric sample

100:Extruder

200:Mold

300: Cooling zone

400:Interleaver

500: Stretch unit

600: Winding machine

GR1, GRn: godet roller

1 is a diagram illustrating a process for manufacturing a spun yarn according to an exemplary embodiment of the present invention. Schematic diagram.

2 is a photograph of an apparatus for measuring computerized color matching (CCM) of functional fabrics according to an exemplary embodiment of the present invention.

3 is a schematic diagram illustrating a device for measuring the cooling sensation on contact of functional fabrics according to an exemplary embodiment of the present invention.

4 is a schematic diagram illustrating a device for measuring the thermal conductivity of functional cloth in the thickness direction according to an exemplary embodiment of the present invention.

FIG. 5 shows results of measuring CCM of spun yarn according to an exemplary embodiment of the present invention.

Unless otherwise defined, all technical terms and scientific terms used in this specification have the same meanings commonly understood by a person of ordinary skill in the art to which this invention relates. Descriptions of known functions and configurations that unnecessarily obscure the gist of the present invention will be omitted from the following description and accompanying drawings.

Furthermore, as used in this specification, the singular forms are intended to include the plural forms unless the context clearly indicates otherwise.

In addition, units used in this specification without specific mention are based on weight, and as an example, % units or ratios refer to weight % or weight ratios. Unless otherwise defined, weight % refers to the weight % of any component in the composition relative to the total weight of the composition.

In addition, numerical ranges used in this specification include upper and lower limits and all values within such limits, increments logically derived from the form and span of the defined range, all double limit values, and any values defined in different forms. in numerical range All possible combinations of upper and lower bounds. Unless otherwise specifically defined in this specification, all values within the numerical range that may appear due to experimental error or rounding of values also belong to the defined numerical range.

In this specification, the expression "includes" is intended to be an opening transitional phrase having equivalent meanings to "includes", "contains", "have/has" and "characterized by", and does not exclude that none of them are included in this specification. elements, materials or steps further enumerated in.

In the dope-dyed polyethylene yarn according to the prior art, it is difficult for the pigment to be uniformly mixed with the polyethylene having a relatively high viscosity, and due to the non-uniformity of the mixing between the pigment and the polyethylene raw material, the color of the spun yarn is inconsistent. Uniformity is serious. Therefore, the quality is degraded due to the non-uniformity of the solution-dyed yarn itself, and the physical properties of the spun yarn, such as strength, are deteriorated due to the addition of a large amount of pigment in order to express the desired color. In addition, the quality of the final products manufactured using spun yarns also degrades.

Therefore, the applicant has long conducted extensive research to develop polyethylene fibers having excellent color uniformity while maintaining their physical properties. Therefore, the Applicant has developed a novel solution-dyed polyethylene yarn with excellent color uniformity by increasing the degree of mixing between the pigment and the raw material of the polyethylene yarn.

Specifically, the dope-dyed polyethylene yarn according to the present invention is a dope-dyed polyethylene yarn containing pigments, wherein L*, a* and b* measured under the following measurement conditions satisfy the following expression:

[Measurement conditions]

Computerized color matching (CCM) is measured in the measurement area formed by winding dope-dyed polyethylene yarn around a planar substrate, and CCM is measured each time 70 turns of dope-dyed polyethylene yarn are wound around the substrate At least n times (n is 50 or a natural number greater than 50),

Among them, C _max , C _min and C _aver respectively represent the maximum value, minimum value and average value of any one selected from L*, a* and b*.

Specifically, in the expression, (C _max -C _min )/C _aver ×100 may be 0.1 to 8, and more specifically 3 to 7. Solution-dyed polyethylene yarn has excellent color uniformity such that the coloring characteristics can be excellent compared to the amount of pigment added. In addition, despite the addition of a small amount of pigment, the solution-dyed polyethylene yarn has excellent coloring characteristics, allowing the solution-dyed polyethylene yarn to maintain the inherent excellent thermal conductivity of high-density polyethylene, thereby producing fabrics with an excellent cool feeling .

Specifically, when the dope-dyed polyethylene yarn is wound around a planar substrate, an area covered with the dope-dyed polyethylene yarn (ie, a measurement area) is formed on the substrate.

In this case, the solution-dyed polyethylene yarn wound with n-1 (n is a natural number greater than 2) turns and the solution-dyed polyethylene yarn wound with n turns may be in contact with each other, so that the solution-dyed polyethylene yarn is in The base is wrapped around the perimeter of the base in one direction.

Since the measured area is formed by covering the substrate with solution-dyed polyethylene yarn, the measured area exhibits a color similar to that when the solution-dyed polyethylene yarn is made into fabric. The measurement area is not limited as long as it has an area where CCM can be measured. However, the area occupied by the measurement zone on the substrate can be appropriately adjusted according to the size of the substrate and the thickness and number of winding turns of the solution-dyed polyethylene yarn. As a non-limiting example, the measurement area can be obtained by winding 30 turns or more (specifically 40 to 100 turns, and more specifically 50 to 90 turns) of a stock solution with a thickness of 410 deg around a square planar substrate. Formed from dyed polyethylene yarn, the flat base has a width of 6.5 cm, 6.5 cm length and 0.5 cm height.

In the measurement area formed by the method described above, when measuring the n-1 (n is a natural number greater than 2) CCM and then measuring the n-th CCM, it can be used A measurement area for measuring the n-th CCM is formed on the measurement area formed by measuring the n-1 type CCM.

In the following, it is assumed that the previously formed measurement area is the first measurement area, and the subsequently formed measurement area is the second measurement area.

The CCM is measured in a first measurement zone formed by wrapping 70 turns of solution-dyed polyethylene yarn around the substrate in one direction, and then, again by wrapping solution-dyed polyethylene yarn around the first measurement zone. The CCM is measured in the second measurement area formed by polyethylene yarn. That is, the second measurement area is formed by winding the solution-dyed polyethylene yarn to cover the first measurement area, and at the same time, the winding direction of the solution-dyed polyethylene yarn is changed to a direction opposite to one direction of the substrate.

Therefore, the first measurement area for measuring the n-1th CCM and the second measurement area for measuring the nth CCM have the same size, and when the second measurement area is formed on the first measurement area, The thickness of the gauged area formed on the substrate increases the thickness of the solution-dyed polyethylene yarn. In the first measurement area and the second measurement area, the CCM can be measured at the same location.

The L*, a* and b* of the CCM measured in the measurement area can satisfy the expressions described above.

Specifically, it may be contained in an amount of 0.00005 to 1% by weight, specifically 0.0001 to 0.5% by weight, and more specifically 0.002 to 0.05% by weight relative to the total weight of the dope-dyed polyethylene yarn. Pigments, but the invention is not limited thereto. However, compared to a certain amount of pigment added, within the above range, Solution-dyed polyethylene yarn can have excellent dyeing characteristics and color uniformity.

In this case, when measuring the CCM of the spun yarn, the standard deviation of the L* value is 3 or less, specifically 2 or less, and more specifically 1.5 or less. Therefore, solution-dyed polyethylene yarn can have remarkably excellent color uniformity that may not be readily discernible to the naked eye.

In the present invention, the pigment is not limited as long as it is a pigment or raw material used in dope dyeing of polyethylene according to the prior art. As a specific example, in the case of black polyethylene yarn, the pigment may be carbon black particles.

When measured according to ASTM D2256, the initial modulus of solution-dyed polyethylene yarn can be from 50 cN/dtex to 300 cN/dtex, and specifically from 70 cN/dtex to 150 cN/dtex. . In this case, when measured according to ASTM D2256, the strength of the solution-dyed polyethylene yarn may be, but is not limited to, 4 g/denier to 20 g/denier, and specifically 10 g/denier to 15 g/denier. Danny. However, within the above range, the solution-dyed polyethylene yarn may have high thermal conductivity and hardness suitable for weavability.

In addition, the polydispersity index of the dope-dyed polyethylene yarn may be from 5 to 20, and specifically from 7 to 15, and in this case, the weight-average molecular weight of the dope-dyed polyethylene yarn may be from 45,000 g/mol to 300,000 Gram/mol, and preferably 100,000 grams/mol to 200,000 grams/mol. Within the above range, when melt extrusion is spun, the flowability of the melt is preferable, preventing thermal decomposition from occurring, and ensuring that handleability such as yarn breakage does not occur during drawing, so that it is possible to manufacture products with uniform physical properties of the fabric and provide fabrics with excellent durability.

In addition, when measured according to ASTM D1238 at 190°C and 2.16 kg, the melt index (MI, @190°C) of solution-dyed polyethylene yarn can be 0.5 grams /10 minutes to 22 grams/10 minutes, specifically 1 grams/10 minutes to 10 grams/10 minutes, and more specifically 2 grams/10 minutes to 8 grams/10 minutes. In addition, the density of solution-dyed polyethylene yarn can range from 0.93 to 0.97 grams/cubic centimeter. In addition, the crystallinity of solution-dyed polyethylene yarn after spinning can be 60% to 80%, and specifically 65% to 75%. The crystallinity of the polyethylene yarn can be deduced together with the crystallite size during crystallinity analysis using an X-ray diffractometer. As described above, when the melt index, density, and crystallinity are within the above ranges, heat is rapidly transferred in the direction of the molecular chains connected via covalent bonds of high-density polyethylene (HDPE) through lattice vibrations called phonons. The function of diffusing and dissipating and improving the discharge of moisture generated by sweating or breathing can provide a fabric with an excellent cooling feeling.

In addition, when measured according to ASTM D4974-04, solution-dyed polyethylene yarn has a significantly lower dry heat shrinkage (@100°C) of 2% to 15%, and specifically 2.7% to 5%, making the solution Dyed polyethylene yarn can have excellent shape stability.

The solution-dyed polyethylene yarn of the present invention can be produced by a doping dyeing method.

Specifically, the solution-dyed polyethylene yarn may be formed from a polyethylene resin composition containing a color masterbatch prepared by mixing and drying a pigment with polyethylene in the form of wafers to prepare a first the main wafer; and repeat the process of melting and remixing the first main wafer and drying the first main wafer n (n is 1 or a natural number greater than 1) times to prepare the nth main wafer. In this case, n may be, but is not limited to, 2 to 5, and specifically 2 or 3. Preparing the polyethylene resin composition containing the color masterbatch prepared as described above allows the solution-dyed polyethylene yarn to have better color uniformity.

The content of pigments in the color masterbatch can be adjusted differently, and can range from 0.05% to 10.0% by weight relative to the total weight of the color masterbatch, and specifically 0.1% by weight The pigment is contained in an amount of % by weight to 5% by weight. Within the above range, the solution-dyed polyethylene yarn can have excellent coloring characteristics despite a lower content of pigments compared to color masterbatches according to the prior art.

In addition, in the polyethylene resin composition containing the color masterbatch, the color masterbatch can be appropriately mixed according to the content ratio of the pigment in the spinning yarn described above. Specifically, the color masterbatch may be contained in an amount of 0.1 to 10% by weight relative to the total weight of the polyethylene resin composition.

Solution-dyed polyethylene yarn produced by doping dyeing can have significantly excellent color uniformity as described above, allowing high-quality fabrics to be provided.

Hereinafter, a method of manufacturing a solution-dyed polyethylene yarn according to an exemplary embodiment of the present invention will be described in detail with reference to FIG. 1 .

First, a first master wafer is obtained by mixing the pigment with polyethylene in the form of wafers, and then the dried first master wafer is melted again and remixed to obtain a second master wafer. Thereafter, a solution-dyed polyethylene melt is obtained by injecting the prepared second master wafer and the polyethylene in the form of wafers into the extruder 100 and melting them.

The molten polyethylene is transported through the die 200 by screws (not shown) in the extruder 100 , and the transported polyethylene is extruded through a plurality of holes formed in the die 200 . The number of holes of the mold 200 can be determined according to the denier per filament (DPF) and the fineness of the spun yarn to be produced. For example, when manufacturing a spun yarn with a total fineness of 75 denier, the mold 200 may have 20 to 75 holes; and when manufacturing a spun yarn with a total fineness of 450 denier, the mold 200 may have 90 to 450 holes. holes and preferably 100 to 400 holes.

Depending on the melt index of the polyethylene mold, the melting process performed in the extruder 100 and the extrusion process performed in the mold 200 may be changed and applied. specific language Specifically, for example, the melting process and the extrusion process are performed at 150°C to 315°C, preferably 250°C to 315°C, and further preferably 265°C to 310°C. That is, the extruder 100 and the mold 200 are maintained at 150°C to 315°C, preferably 250°C to 315°C, and more preferably 265°C to 310°C.

When the spinning temperature is lower than 150°C, polyethylene cannot be melted uniformly due to the lower spinning temperature, making spinning difficult. On the other hand, when the spinning temperature is higher than 315°C, the required strength may not be exhibited due to thermal decomposition of polyethylene.

The ratio L/D of the hole length L to the hole diameter D of the mold 200 may be 3 to 40. When L/D is less than 3, die expansion may occur during melt extrusion, and the elastic behavior of polyethylene is difficult to control, resulting in poor spinnability. When L/D exceeds 40, yarn breakage may occur due to necking of the molten polyethylene passing through the mold 200, and uneven discharge may occur due to pressure reduction.

The polyethylene is solidified by the difference between the spinning temperature and room temperature, while the molten polyethylene is discharged through the holes of the mold 200 to form the semi-cured filament 11 . In the present invention, both semi-cured filaments and fully cured filaments are collectively referred to as "filaments".

The plurality of filaments 11 are cooled in a cooling zone (or quenching zone) 300 to completely solidify. Cooling of the filament 11 can be performed by air cooling.

In addition, multi-stage cooling is performed when cooling in the cooling zone, so that more uniform crystallization can be obtained. Therefore, it is possible to produce fabrics that more smoothly discharge moisture and sweat and have an excellent cooling feel.

Subsequently, the cooled and fully solidified filaments 11 may be interlaced by the interlacer 400 to form the multifilament 10 .

As shown in Figure 1, the polyethylene yarn of the present invention can be produced by a direct spinning drawing (DSD) process. That is to say, the multifilament yarn can be 10 is directly transferred to the multi-stage drawing unit 500 including a plurality of godet rollers GR1 to godet rollers GRn. The transferred multifilament 10 can be subjected to multi-stage drawing at a total drawing ratio of 2 to 20 and preferably 3 to 15. , and then, the drawn multifilament 10 can be wound around the winding machine 600 . In addition, applying shrinkage stretching (relaxation) of 1% to 5% in the final stretching part in multi-stage stretching makes it possible to provide a cloth with better durability.

Alternatively, the polyethylene yarn of the present invention may be produced as an undrawn spun yarn by winding the multifilament 10 and then drawing the undrawn spun yarn. That is, the polyethylene yarn of the present invention can be made through a two-stage process of melt-spinning polyethylene to make an undrawn spun yarn and then drawing the undrawn spun yarn.

The functional fabric according to the present invention includes solution-dyed polyethylene yarn. Because the functional fabric contains solution-dyed polyethylene yarn with excellent color uniformity and excellent thermal conductivity, the functional fabric can have excellent coloring characteristics and color uniformity, and can have a cool feeling.

The dope-dyed polyethylene yarn described above can be used alone to manufacture the functional fabric according to the present invention, and can further include spun yarns different from the dope-dyed polyethylene yarn to further impart another functionality. In terms of excellent coolness and color uniformity, polyethylene yarn alone is better.

Specifically, when measured by bringing a heating plate (T box) heated to 30±2℃ into contact with functional fabric at 20±2℃ at 20±2℃ and 65±2% R.H, the function The sexual fabric can have a contact cooling sensation of 0.1 Watt/cm² to 0.3 Watt/cm², and when heated to 30±2℃ by a heat source plate (BT box) at 20±2℃ and 65±2% R.H. When measured in contact with the functional fabric at 20±2°C, the functional fabric can have a thermal conductivity of 0.05 Watt/meter Kelvin to 0.25 Watt/meter Kelvin in the thickness direction. More specifically, the contact cooling sensation can be 0.15 watts/square meter cm² to 0.22 Watt/cm², and the thermal conductivity can be from 0.08 Watt/meter Kelvin to 0.2 Watt/meter Kelvin. When the functional fabric with a cooling sensation is subsequently manufactured or processed into a product and worn by a user, the functional fabric can provide the user with an appropriate cooling sensation to feel comfortable in a high temperature environment.

Fabrics can be processed into products with a cooling feel that require appropriate cooling. The product can be any textile product according to the prior art, and can preferably be summer clothes, sportswear, face coverings and work clothes to impart a cooling sensation to the human body.

In the following, the invention will be described in more detail with reference to examples. However, the following examples are only reference examples for describing the present invention in detail, and the present invention is not limited thereto and can be implemented in various forms.

Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention relates. The terminology used in the description herein is used only to effectively describe an example and does not limit the invention. In addition, unless otherwise stated in this specification, the unit of additives may be weight %.

Physical properties were measured as follows.

[Measuring the physical properties of spinning yarn]

<1.Measure computer color matching (CCM)>

As shown in Figure 2, a measurement area was formed by wrapping solution-dyed polyethylene yarn around a substrate with a width of 6.5 cm, a length of 6.5 cm, and a height of 0.5 cm, and the computer color matching ( CCM), and the CCM is measured each time 70 (±10) turns of the solution-dyed polyethylene yarn are wound around the substrate. The total number of CCM measurements is 135.

CCM was measured by a colorimeter (KAE1-063, GNB TECH), and Calculate the L*, a*, and b* values and evaluate the following expressions.

[Expression](C _max -C _min )/C _aver ×100

Among them, C _max , C _min and C _aver respectively represent the maximum value, minimum value and average value of any one selected from L*, a* and b*.

<2. Weight average molecular weight (Mw) (gram/mol) and polydispersity index (PDI)>

The polyethylene yarn was completely dissolved in the following solvent, and then gel permeation chromatography (GPC) was used to calculate the weight average molecular weight (Mw) and polydispersity index (Mw/Mn: PDI) of the polyethylene yarn ).

- Analyzer: HLC-8321 GPC/HT, Tosoh Corporation

-Column: PLgel shield (7.5×50 mm) + 2×PLgel Mix-B (7.5×300 mm)

-Column temperature: 160℃

- Solvent: Trichlorobenzene (TCB) + 0.04 wt% dibutylated hydroxytoluene (BHT) (after _drying with 0.1% CaCl)

-Syringe and detector temperature: 160℃

-Detector: RI detector

-Flow rate: 1.0 ml/min

-Injection volume: 300 ml

-Sample concentration: 1.5 mg/ml

-Standard sample: polystyrene

<3. Strength (gram/denier) and initial modulus (gram/denier)>

Stress-strain curves for polyethylene yarns were obtained using a universal tensile tester (Instron Engineering Corp, Canton, Mass.) according to ASTM D2256 method. The sample length was 250 mm, the tension speed was 300 mm/min, and the initial load was set to 0.05 g/denier. The strength (grams/denier) is calculated from the stress at break point and the elongation, and the initial modulus (grams/denier) is calculated from the tangent to the curve near the origin that provides the maximum gradient. Perform 5 measurements for each spin and calculate the average.

<4.Crystallinity>

An X-ray diffractometer (XRD) [manufacturer: Malvern Panalytical, model name: EMPYREAN] was used to measure the crystallinity of the polyethylene yarn. Specifically, the polyethylene yarn was cut to prepare a sample with a length of 2.5 cm, the sample was fixed to the sample holder, and the measurement was performed under the following conditions.

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

-Power: 45 kV × 25 mA

-Mode: continuous scan mode

-Scan angle range: 10° to 40°

-Scan speed: 0.1°/second

<5.Breaking strength (kg force) and elongation at break (%)>

Spinning was measured according to ASTM D-885 test method by applying a tensile speed of 300 mm/min to a sample size of 250 mm using an Instron tester (Instron Engineering Co., Canton, MA). Breaking strength of yarn samples.

<6. Dry heat shrinkage>

According to the ASTM D4974-04 method, use a dry heat shrinkage measuring device (manufacturer: TESTITE, model name: MK-V) to measure the sample under the application of 0.2 g/ The initial length (L1) under a load of denier and the length (L2) of the sample after 2 minutes under a load of 0.2 g/denier at 100°C are calculated by the following expression 2 Dry heat shrinkage rate (%): [Expression 2] Dry heat shrinkage rate (%) = [(L1-L2)/L1]×100.

<7. Melt index>

Melt index (MI, @190℃) measured according to ASTM D1238 at 190℃ and 2.16 kg.

[Measuring physical properties of fabric]

<1. Cool feeling on contact>

According to requirements, Korea Apparel Testing & Research Institute (KATRI) used KES-F7 (Thermo Labo II) equipment to measure the contact cooling sensation in a test environment of 20±2℃ and 65%±2% R.H.

Specifically, a fabric sample with a size of 20 cm × 20 cm is prepared, and the fabric sample is left to stand for 24 hours at a temperature of 20±2°C and an RH of 65±2%. Subsequently, KES-F7 THERMO LABO II (Kato Tech Co., Ltd.) equipment was used to measure the contact coolness of the fabric in a test environment with a temperature of 20±2℃ and an RH of 65±2%. (Qmax). Specifically, as shown in Figure 3, the fabric sample 23 is placed on a bottom plate (also called a "Water-Box") 21 maintained at 20°C, and is heated to 30°C ± 2 The heating plate (T box) 22a (contact area: 3 cm × 3 cm) at ℃ is placed on the cloth sample 23 for only 1 second. That is, one surface of the cloth sample 23 having the other surface in contact with the bottom plate 21 is immediately brought into contact with the T box 22a. The connection applied to the fabric sample 23 by the T-box 22a The contact force is 6 gf/cm2. Subsequently, the Qmax value displayed on a monitor (not shown) connected to the device was recorded. This test is repeated 10 times and the arithmetic mean of the Q maximum values is calculated.

<2.Thermal conductivity>

Prepare a fabric sample with a size of 20 cm × 20 cm, and let the fabric sample stand for 24 hours at a temperature of 20±2°C and an RH of 65±2%. Subsequently, KES-F7 THERMO LABO II (Kato Technology Co., Ltd.) equipment was used to measure the thermal conductivity and heat transfer coefficient of the fabric in a test environment with a temperature of 20±2°C and an RH of 65±2%. Specifically, as shown in FIG. 4 , the cloth sample 23 is placed on the bottom plate 21 maintained at 20°C, and the heat source plate (BT box) 22b heated to 30°C±2°C (contact area: 5 cm × 5 cm) is placed on the fabric sample 23 for 1 minute. Heat is continuously supplied to the BT box 22b, so that even when the BT box 22b is in contact with the cloth sample 23, the temperature of the BT box 22b is maintained at 30°C. The amount of heat supplied to maintain the temperature of the BT box 22b (ie, heat flow losses) is shown on a monitor (not shown) connected to the device. The test is repeated 5 times and the arithmetic mean of the heat flow loss values is calculated. Then, use the following Expression 3 and Expression 4 to calculate the thermal conductivity and heat transfer coefficient of the fabric: [Expression 3]K=(W.D)/(A.△T)

[Expression 4]k=K/D

Among them, K is the thermal conductivity (W/cm.℃), D is the thickness of the cloth sample 23 (cm), A is the contact area of the BT box 22b (=25 square centimeters), ΔT is the two surfaces of the cloth sample 23 The temperature difference between them (=10℃), W is the heat flow loss (watts Special) and k is the heat transfer coefficient (W/cm2.°C).

[Example 1]

<Preparation of color masterbatch>

First, a first master wafer is obtained by mixing pigments with polyethylene in the form of wafers, and then the dried first master wafer is melted and mixed again to obtain a second master wafer, that is, a color masterbatch. In this case, the pigment was mixed in an amount of 0.83% by weight relative to the total weight of the color masterbatch.

<Manufacturing polyethylene yarn>

Manufacture of solution-dyed polyethylene yarn with a total fineness of 410 denier.

Specifically, a polyethylene wafer having a weight average molecular weight (Mw) of 154 of 604 g/mol and a second master wafer were injected into the extruder to melt, thereby forming a melt. In this case, the second master wafer was mixed in an amount of 3% by weight relative to the total weight of the melt. The melt was extruded through a die with 200 holes. The ratio L/D of the length L of the mold to the diameter D of the hole is 6. The mold temperature is 270°C.

The filaments formed upon discharge through the nozzle holes of the mold are cooled, interlaced, and then drawn. The drawn multifilament was then wound around a winder with a winding tension of 0.8 g/denier.

Measure the physical properties of manufactured spun yarns. The calculated value of (C _max -C _min )/C _aver ×100 is shown in Table 1 as the ΔC value.

<Manufacturing functional fabrics>

The produced solution-dyed polyethylene yarn is woven to produce functional fabrics with an area density of 500 g/m2. Measure the physical properties of manufactured functional fabrics. The results are plotted in Table 2.

[Example 2]

Except that in Example 1, the content of the pigment in the color masterbatch changed from 0.83% by weight to 0.40% by weight, and the content of the color masterbatch in the melt changed from 3% by weight to 3.3% by weight, the results were the same as in Example 1. In the same way the yarn and cloth are made. In addition, the measured physical properties of the spun yarn and fabric produced in the same manner as Example 1 are shown in Table 1 and Table 2, respectively.

[Example 3]

Except that in Example 1, the content of the pigment in the color masterbatch changed from 0.83% by weight to 0.40% by weight, and the content of the color masterbatch in the melt changed from 3% by weight to 3.8% by weight, the results were the same as in Example 1. In the same way the yarn and cloth are made. In addition, the measured physical properties of the spun yarn and fabric produced in the same manner as Example 1 are shown in Table 1 and Table 2, respectively.

[Comparative example 1]

Except in Example 1, the pigment was mixed with polyethylene in the form of wafers (277 g/mol, weight average molecular weight (Mw) 134) to obtain a first master wafer, and the dried first master wafer was used as a color masterbatch Spinning yarn and fabric were produced in the same manner as in Example 1, except that the pigment content in the color masterbatch was changed to 10.0% by weight, and the content of the color masterbatch in the melt was changed from 3% by weight to 0.25% by weight. . In addition, the measured physical properties of the spun yarn and fabric produced in the same manner as Example 1 are shown in Table 1 and Table 2, respectively.

Referring to Table 1 and Table 2, in the case of the fabric according to each of the examples, it was confirmed that the mechanical properties such as strength and elongation were excellent, the coolness was excellent, and the color uniformity of the spun yarn was remarkably excellent. .

Figure 5 shows the value of CCM over time by measuring the CCM value in the measurement area of the dope-dyed polyethylene yarn shown in Figure 2 while spinning the dope-dyed polyethylene yarn according to each of the examples. And the results obtained. Specifically, the CCM values of the solution-dyed polyethylene yarns according to Examples 1 to 3 and Comparative Example 1 are shown.

Referring to Figure 5, in the dope-dyed polyethylene yarn according to the present invention, it was confirmed that there was little change in color even during long-term spinning, and thus a spun yarn with excellent color uniformity was produced.

Although the present invention has been described above with specific materials, exemplary embodiments, and drawings, they are only used to help fully understand the present invention. Therefore, the present invention is not limited to the exemplary embodiments. Various modifications and changes mentioned in this specification can be made to the present invention by those with ordinary skill in the art.

Therefore, the spirit of the present invention should not be limited to the described exemplary embodiments, but the claimed scope and all modifications equivalent to the claimed scope are intended to be within the scope and spirit of the present invention.

10:Multifilament

11:Filament

100:Extruder

200:Mold

300: Cooling zone

400:Interleaver

500: Stretch unit

600: Winding machine

GR1, GRn: godet roller

Claims (10)

A dope-dyed polyethylene yarn, including pigments, wherein L*, a* and b* measured under the following measurement conditions satisfy the following expression: [Measurement Conditions] By winding the dope-dyed polyethylene yarn around a planar substrate vinyl yarn to form a measurement area in which computer color matching (CCM) is measured, and each time 70 turns of the solution-dyed polyethylene yarn are wound around the substrate, the CCM is measured for at least n times (n is 50 or a natural number greater than 50),

Among them, C _max , C _min and C _aver respectively represent the maximum value, minimum value and average value of any one selected from L*, a* and b*. The dope-dyed polyethylene yarn of claim 1, wherein when measuring the CCM of the dope-dyed polyethylene yarn, the standard deviation of the L* value is 3 or less than 3. The dope-dyed polyethylene yarn according to claim 1, wherein the pigment is contained in an amount of 0.00005 to 1 wt% relative to the total weight of the dope-dyed polyethylene yarn. The solution-dyed polyethylene yarn according to claim 1, wherein the crystallinity of the solution-dyed polyethylene yarn is 60% to 80%. The solution-dyed polyethylene yarn of claim 1, wherein when measured according to ASTM D2256, the solution-dyed polyethylene yarn has an initial modulus of 50 centinewtons/dtex to 300 centinewtons/dtex and 4 grams /Danny to 20 Grams/Danny’s Strong Spend. The solution-dyed polyethylene yarn of claim 1, wherein when measured according to ASTM D1238, the solution-dyed polyethylene yarn has a melt index (MI, at 190° C.) of 0.5 g/10 min to 22 g/10 min. ). The solution-dyed polyethylene yarn of claim 1, wherein the solution-dyed polyethylene yarn has a dry heat shrinkage (at 100° C.) of 2% to 15% when measured according to ASTM D4974-04. A functional fabric produced using the solution-dyed polyethylene yarn described in any one of claims 1 to 7. The functional fabric as described in claim 8, wherein when the heating plate (T box) at 30±2°C is used at 20±2°C and 65±2% R.H. When measured by contact with a functional fabric, the functional fabric has a contact cooling sensation of 0.1 watts/cm2 to 0.3 watts/cm2. The functional fabric as described in claim 8, wherein when the heat source plate (BT box) at 30±2°C is used at 20±2°C and 65±2% R.H, the function is compared with the said function at 20±2°C When measured in contact with a functional fabric, the functional fabric has a thermal conductivity of 0.05 Watts/meter Kelvin (W/mK) to 0.25 Watts/meter Kelvin (W/mK) in the thickness direction.