KR102286243B1 - Hygroscopic polyamide fiber and preparing method therof - Google Patents

Abstract

The polyamide yarn of the present invention is made of polyamide-based cross-sectional fibers containing polyetherdiamine in an amount of 10-50 wt% with respect to polyamide, contains a heat-resistant agent, and is 24 under an environment of 30°C and 90% RH It is characterized in that the moisture absorption rate after holding for a period of time is 4% to 8%, and the hygroscopicity measured by the Wicking Test is 50 to 120 mm/10 minutes, the polyamide yarn of the present invention has a moisture content of a general nylon yarn Because it is higher than that, it has improved hygroscopicity, contact cooling and comfort, so it can be used for various purposes such as innerwear and sportswear.

Description

High hygroscopic polyamide fiber and its manufacturing method

The present invention relates to a highly hygroscopic polyamide fiber containing a polyamide resin and a method for manufacturing the same, and more particularly, to a highly hygroscopic polyamide fiber having excellent hygroscopicity, contact cooling and touch feeling, and a manufacturing method thereof.

Polyamide yarn is excellent in strength, chemical resistance, heat resistance, etc., so it is widely used for clothing and industry.

In particular, polyamide fibers have relatively excellent hygroscopicity in addition to their unique softness, high tensile strength, color development at the time of dyeing, and high heat resistance, and are widely used in applications such as innerwear and sportswear. However, compared with natural fibers such as cotton, polyamide fibers have far less hygroscopicity and a feeling of dampness or stickiness, so there is a limit to being inferior to natural fibers in terms of wearing comfort.

Polyamide yarns exhibiting excellent hygroscopicity for preventing the dampness and stickiness of polyamides and having wear comfort close to natural fibers are mainly desired for innerwear applications and sports apparel applications.

In order to improve the hygroscopicity, the method of adding a hydrophilic compound to the polyamide fiber has been generally studied the most. For example, Korean Patent Registration No. 10-0417927 proposes a hygroscopic polyamide fiber containing polyvinylpyrrolidone as a moisture absorption component, but in this method, a large amount of polyvinyl When rolidone is added, polyvinylpyrrolidone gradually precipitates from the fibers during wear and has a problem of sticking, so high hygroscopicity above a certain level cannot be realized.

U.S. Patent No. 5,306,761 proposes a method of manufacturing a fiber using a polyamide resin copolymerized with polyoxyalkylene glycol, which is a hydrophilic component. However, according to the above technique, it is necessary to increase the copolymerization ratio in order to achieve sufficient moisture absorption performance, and since the physical properties such as strength and elongation of the yarn are significantly impaired, it is practically difficult to obtain polyamide fibers that satisfy both moisture absorption and physical properties. There are limits.

Accordingly, there is a demand for the development of polyamide fibers having hygroscopicity comparable to natural fibers without impairing the excellent properties of polyamide fibers.

The present invention is to solve the problems of the prior art described above, and one object of the present invention is high value-added hygroscopicity having high hygroscopicity, contact cooling sensitivity, and wearing comfort without impairing the excellent physical properties of polyamide itself. To provide polyamide fibers.

Another object of the present invention relates to a highly hygroscopic polyamide fiber reinforced with heat resistance so that thermal decomposition of the yarn does not occur even under high-temperature spinning conditions and a method for manufacturing the same.

One aspect of the present invention for achieving the above object is,

With respect to polyamide, it is made of a polyamide-type cross-sectional yarn containing polyetherdiamine in an amount of 10 to 50 wt%, contains a heat-resistant agent, and has a moisture absorption rate after maintaining it for 24 hours under an environment of 30°C and 90% RH. It is 4% to 8%, and relates to a highly hygroscopic polyamide fiber, characterized in that the hygroscopicity measured by the Wicking Test is 50 mm/10 min.

The polyetherdiamine has a number average molecular weight in the range of 1000 to 3000.

The polyamide fibers have a linear density of 1.0 or less per filament. In addition, the polyamide fiber has a strength of 4.0 gf/den or more, an elongation of 35% to 45%, and a difference in moisture absorption (ΔMR) obtained by subtracting moisture absorption at 20°C and 65% RH from moisture absorption at 30°C 90% RH. ) may be 2.0% or more.

Further, in another aspect of the present invention, the polyamide chips containing polyetherdiamine in an amount of 10 to 50 wt% with respect to polyamide are adjusted to have a moisture content of 1,600 to 1,800 ppm, and then spun with a spinneret and blown with cooling air. In the production of polyamide fibers by the direct spinning drawing method in which a spinning oil agent is attached, drawn, and then wound after cooling and solidification, spinning drawing is performed under conditions satisfying the following conditions (1) to (7). It relates to a process for producing a hygroscopic polyamide yarn characterized by:

(1) Cylinder temperature: 250℃/260℃/265℃

(2) Beam temperature: 263℃

(3) Pack pressure: 120kgf

(4) First godet roller discharge linear speed: 3000 m/min or more and 3500 m/min or less

(5) first godet roller temperature: room temperature

(6) Second godet roller discharge linear speed: 3500 m/min or more and 3800 m/min or less

(7) 2nd godet roller temperature: 165℃

Another aspect of the present invention relates to a textile product comprising the above-mentioned highly hygroscopic polyamide fibers.

According to the present invention, it is possible to obtain a high value-added, high hygroscopicity polyamide fiber having a high moisture absorption rate, excellent contact cooling sensation and wearing comfort without impairing the properties of polyamide such as strength and heat resistance.

In addition, since the polyamide yarn of the present invention has a different cross-sectional shape, hygroscopicity and quick-drying properties are also excellent.

1 is a schematic view of an apparatus used for the production of a highly hygroscopic polyamide yarn according to the present invention.
2 is an exemplary cross-sectional view of a spinneret applied to the spinning step of the highly hygroscopic polyamide yarn of an embodiment of the present invention.

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

As used herein, the terms "comprises," "comprising," specify the presence of the stated feature, element, step or component, and the presence or addition of one or more other features, elements, steps, components. It is not intended to exclude

The polyamide fiber of the present invention is composed of a polyamide-based cross-sectional fiber containing polyetherdiamine in an amount of 10 to 50 wt% with respect to polyamide, contains a heat-resistant agent, and under an environment of 30°C and 90% RH It is characterized in that the moisture absorption rate after holding for 24 hours is 4% to 8%, and the hygroscopicity measured by the Byrek method (Wicking Test) is 50 to 120 mm/10 minutes.

The number average molecular weight of the polyetherdiamine is 1000 to 3000.

The polyamide fibers have a linear density of 1.0 or less per filament.

The polyamide fiber has a strength of 4.0 gf/den or more, an elongation of 35% to 45%, and a moisture absorption difference (ΔMR) obtained by subtracting a moisture absorption rate at 20°C 65% RH from a moisture absorption rate at 30°C 90% RH is more than 2.0%.

The polyamide fiber of the present invention preferably has a strength of 40 gf/den or more. By setting the strength of the fiber to 40 gf/den or more, it is possible to realize the practical strength of textile products for clothing, such as innerwear, which is a main use of polyamide fiber products.

The polyamide fiber of the present invention preferably has an elongation of 35% to 45%. When the elongation of the fiber is set to 35% or more, process passability in high-order processes such as weaving, knitting, and false twisting becomes good.

In the polyamide fiber of the present invention, in order to improve wearing comfort, the difference in moisture absorption rate (ΔMR) obtained by subtracting the moisture absorption rate at 20°C 65% RH from the moisture absorption rate at 30°C 90% RH is 2.0% or more am. Here, the moisture absorption rate difference (ΔMR) is an index for obtaining comfort by discharging moisture in clothes to the outside air when wearing clothes. It is the difference in the moisture absorption rate of the outside air temperature and humidity. As ΔMR is larger, it is excellent in hygroscopicity and corresponds to good comfort during wearing. The polyamide fiber of the present invention has a high hygroscopicity with a difference in moisture absorption of 2% or more. When ΔMR is less than 2%, it is only limited to moisture absorptive and desorptive properties equivalent to those of ordinary polyamide 6 or polyamide 66, and there is a problem that comfort during wearing is not high.

In the present invention, the polyamide is preferably nylon 6, nylon 11, nylon 12, nylon 46, nylon 66, nylon 666, nylon 69, nylon 610, nylon 612, nylon 96, nylon 99, nylon 910, nylon 912, nylon 1212 , nylon 6T, nylon 9T, nylon 10T, nylon 12T, nylon 6I, nylon 9I, nylon 10I, nylon 12I and copolymers and mixtures thereof. The polyamide is more preferably selected from nylon 6, nylon 66, nylon 666, nylon 69, nylon 610, nylon 6T, nylon 6I/6T, nylon 612, nylon 11, nylon 12, nylon 46 and copolymers and mixtures thereof. can be

The polyamide fiber of the present invention contains a heat resistant agent. The polyamide fiber of the present invention has a different cross section, and in order to produce a different cross section yarn, it must be spun at a higher temperature than that of general nylon yarn. In order to secure the spinning conditions, a heat-resistant agent is added. In the present invention, the heat resistant agent may be an organophosphorus compound containing phosphonic acid. Non-limiting examples of such heat resistant agents are aminotoris(methylenephosphonic acid) (ATMP), 2-amino ethyl phosphonic acid (AEPN), 1-hydroxyethylene 1, 1-diphosphonic acid (HEDP), ethylenediamine-tetra (methylenephosphonic acid) (EDTMP), tetramethylenediaminetetra(methylenephosphonic acid) (TDTMP), hexamethylenediamine-tetra(methylenephosphonic acid) (HDTMP), diethylenetriaminepenta (methylenephosphonic acid) (DTPMP), 2-carboxyl ethyl-phosphonic acid (CEPA). The heat resistant agent may be added in an amount ranging from 0.01 wt % to 1 wt % based on the polyamide polymer.

The polyamide fiber of the present invention has an irregular cross section. The polyamide-based fiber of the present invention exhibits a pleasant feel and quick-drying performance at the same time by adopting a flat yarn-shaped irregular cross section. The flat yarn shape means a shape in which a circular cross section is stretched in a straight line. Samsan, Sasan, or Osan may be exemplified in the shape of the flat sand. As shown in FIG. 2 , the polyamide-based fiber having a cross section of the flat yarn shape is formed by applying a spinneret having a shape in which a circular spinneret is arranged in a line in a spinning step. For example, the spinneret is a spinneret having a circular outlet structure rather than a slit structure, and the spinneret can be used in which 3 to 5 polymer outlets are formed at equal intervals on a straight line. .

The polyamide fibers of the present invention may include phenolic antioxidants and/or phosphorus antioxidants as antioxidants. The phosphorus-based antioxidant is triphenylphosphite, trisnonylphenylphosphite, tris(2,4-di-tert-butylphenyl)phosphite, tris(2,4-di-tert-butyl-5-methylphenyl)phosphite Phyte, tris[2-tert-butyl-4-(3-tert-butyl-4-hydroxy-5-methylphenylthio)-5-methylphenyl]phosphite, tridecylphosphite, octyldiphenylphosphite, di( Disyl) monophenylphosphite, di(tridecyl)pentaerythritol diphosphite, di(nonylphenyl)pentaerythritol diphosphite, bis(2,4-di-tert-butylphenyl)pentaerythritol diphosphite, bis( 2,6-di-tert-butyl-4-methylphenyl) pentaerythritol diphosphite, bis(2,4,6-tritert-butylphenyl) pentaerythritol diphosphite, bis(2,4-dicumylphenyl) Pentaerythritol diphosphite, tetra(tridecyl)isopropylidenediphenoldiphosphite, tetra(tridecyl)-4,4'-n-butylidenebis(2-tert-butyl-5-methylphenol)diphosphite , Hexa(tridecyl)-1,1,3-tris(2-methyl-4-hydroxy-5-tert-butylphenyl)butanetriphosphite, tetrakis(2,4-di-tert-butylphenyl) Biphenylenediphosphonite, 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide, 2,2'-methylenebis(4,6-di-tert-butylphenyl)-2 -Ethylhexylphosphite, 2,2'-methylenebis(4,6-di-tert-butylphenyl)-octadecylphosphite, 2,2'-ethylidenebis(4,6-di-tert-butylphenyl) ) fluorophosphite, tris(2-[(2,4,8,10-tetrakis-tert-butyldibenzo[d,f][1,3,2]dioxaphosfepin-6-yl)oxy ]Ethyl)amine, 2-ethyl-2-butylpropylene glycol, and 2,4,6-tri-tert-butylphenol may be any one or more selected from the group consisting of phenol.

According to another preferred embodiment of the present invention, the phenolic antioxidant is pentaerythritol-tetrakis[3-(3,5-di-t-butyl-4-hydroxyphenyl)propionate], octadecyl -3-(3,5-di-t-butyl-4-hydroxyphenyl)propionate, 1,1,3-tris(2-methyl-4-hydroxy-5-t-butylphenyl)butane, 1,3,5-tris(4-t-butyl-3-hydroxy-2,6-dimethyl)isocyanuric acid, 1,3,5-tris(4-sec-butyl-3-hydroxy-2 ,6-dimethyl)isocyanuric acid, 1,3,5-tris(4-neopentyl-3-hydroxy-2,6-dimethyl)isocyanuric acid, 2,2'-methylenebis(4-methyl -6-t-butylphenol), 4,4'-butylidenebis(4-methyl-6-t-butylphenol), 1,3,5-trimethyl-2,4,6-tris(3,5 -di-t-butyl-4-hydroxybenzyl)benzene, tris-(3,5-di-t-butyl-4-hydroxybenzyl)-isocyanurate, 3,9-bis{2-[3 -(3-t-Butyl-4-hydroxy-5-methylphenyl)propionyloxy]-1,1-dimethylethyl}-2,4,8,10-tetraoxaspiro[5,5]undecane, tri Ethylene glycol-bis[3-(3-t-butyl-5-methyl-4-hydroxyphenyl)propionate], 1,6-hexanediol-bis[3-(3,5-di-t-butyl) -4-hydroxyphenyl) propionate], N,N'-hexamethylenebis (3,5-di-t-butyl-4-hydroxy-hydrocinnaamide), 3,5-di-t-butyl -4-hydroxybenzylphosphonate-diethyl ester, tris-(3,5-di-t-butyl-4-hydroxybenzyl)-isocyanurate, isooctyl-3-(3,5-di -t-Butyl-4-hydroxyphenol)propionate, N,N'-bis[3-(3,5-di-t-butyl-4-hydroxyphenyl)propionyl]hydrazine, p-chloromethyl It may be any one or more selected from the group consisting of a polycondensate of styrene and p-cresol, a polycondensate of p-chloromethylstyrene and divinylbenzene, and an isobutyrene reaction product of a polycondensate of p-cresol and divinylbenzene.

In addition, in the polyamide fiber in the present invention, various additives such as matte agent, flame retardant, ultraviolet absorber, infrared absorber, crystal nucleating agent, optical brightener, antistatic agent, etc. are required in a total additive content of 0.001 to 10% by weight. may be mixed according to

Another aspect of the present invention relates to a method for producing a highly hygroscopic polyamide yarn. The polyamide fiber of this invention can be manufactured by the following method. 1 is a schematic view showing an example of a direct spinning drawing apparatus used for producing a polyamide fiber according to the present invention.

In the present invention, a polyamide fiber having a moisture content of 1,600 to 1,800 ppm discharged from a spinneret containing polyetherdiamine in an amount of 10 to 50 wt% with respect to polyamide and a heat resistance agent is cooled with cooling air. After solidification, in the production of polyamide fibers by the direct spinning drawing method in which an oil agent for spinning is attached, drawn, and then wound, spinning is drawn under conditions satisfying the following conditions (1) to (7).

(1) Cylinder temperature: 250℃/260℃/265℃

(2) Beam temperature: 263℃

(3) Pack pressure: 120kgf

(4) First godet roller discharge linear speed: 3000 m/min or more and 3500 m/min or less

(5) first godet roller temperature: room temperature

(6) Second godet roller discharge linear speed: 3500 m/min or more and 3800 m/min or less

(7) 2nd godet roller temperature: 165℃

The moisture content of the polyamide fiber (24° C., 1 hour) is preferably 1600 to 1800 ppm.

A polyamide polymer including polyetherdiamine and a heat resistant agent and a heat resistant agent are spun through the spinning pack 1 and the nozzle 2 at a spinning temperature of preferably 270 to 320°C. The polymer may include a heat-resistant agent to prevent a decrease in viscosity of the polymer due to thermal decomposition.

In the present invention, the melt-discharged yarn 4 passes through the cooling zone 3 and is cooled and solidified. In the cooling zone (3), open quenching method, circular closed quenching method, and radial outflow quenching method can be applied depending on the method of blowing cooling air. An open quenching method is preferred. Then, while passing through the cooling zone (3), the solidified discharge yarn (4) can be oiled at 0.5 to 3.0% by the emulsion applying device (5).

In the method for producing the polyamide fiber of the present invention, the preferred spinning speed of the undrawn yarn is 200 to 1,000 m/min. Due to the difference in cooling between the surface and the inside of the undrawn yarn, it causes damage to the yarn when drawn at a high magnification. In addition, when the single yarn fineness of the undrawn yarn is 5 denier or less, the number of filaments of the undrawn yarn is excessively increased, and thus process stability during spinning is deteriorated.

The high-strength polyamide fiber of the present invention is drawn at a total draw ratio of 4.5 to 6.5 while passing the yarn passing through the first godet roller 6 through a series of godet rollers 7, 8 and 9 by a spin draw method. By doing this, the final drawn yarn 11 is obtained.

In the first-stage stretching process and the second-stage stretching process of the present invention, crystallization mainly by orientation proceeds. In the one-stage stretching process of the present invention, the preferred stretching temperature is room temperature, and the draw ratio is 1.05 to 1.5 times. When the draw ratio exceeds 1.5 times, excessive stretching of the yarn

force may occur.

In the two-stage stretching process of the present invention, the preferred stretching temperature is 160 to 170°C, and the stretching ratio is 2.5 to 3.5 times. progresses, which is undesirable.

The highly hygroscopic polyamide fiber of the present invention may be manufactured into a textile product such as a woven fabric, a knitted fabric, or a non-woven fabric. The textile product of the present invention has high moisture absorption and excellent contact cooling sensation, and can be manufactured into a fabric having very good comfort and wearability, so, for example, underwear, lining, sweater, shirt, men's wear, pantyhose, socks, hat , scarf, work clothes, ski/skating clothes, diving clothes, fishing or mountaineering clothes, sportswear such as training clothes, sheets, bedding such as inner cotton, vehicle interior materials, interior materials, synthetic leather It can be widely used in fields such as products such as foam.

The present invention may be better illustrated by the following examples, which are for illustrative purposes only and are not intended to limit the scope of protection defined by the appended claims.

Example

Example 1

Using the direct spinning and stretching apparatus shown in FIG. 1, melt spinning, stretching, and heat treatment were continuously performed to prepare a polyamide yarn.

A polyhexamethylene adipamide polymer having a relative viscosity (RV) of 3.3, each containing polyetherdiamine having a number average molecular weight of 2000, a heat resistance agent (aminotoris (methylenephosphonic acid)), and an antioxidant, was prepared using an extruder at a temperature of 292° C. was melt-spun at a spinning draft ratio of 42. At this time, the filter residence time in the spin pack was 10 seconds, the L/D of the screw of the extruder used was adjusted to 28, and a static mixer with two units was installed in the polymer conduit of the spin pack to evenly mix the melt-spun polymer. . Next, the ejected yarn prepared by passing the polymer melted in the pack through a spinneret having the cross-sectional shape of FIG. 2 was sent to a cooling zone with a length of 700 mm (open cooling chamber, 20° C., blowing in cooling air having a wind speed of 0.6 m/sec) It was solidified by passing through it, and then oiled with a spinning emulsion. This undrawn yarn was wound up at a spinning speed of 460 m/min and stretched in three stages. The first step stretching is performed at 40° C. at 1.2 times, the second step stretching at 72° C. at 3.0 times, and the third step stretching at 212° C. at 1.7 times, heat setting at 230° C. (relaxation temperature) and 4% relaxation. It was wound to prepare a final drawn yarn of 315d/136f. Spinning and stretching conditions are shown in Table 1 below. The physical properties of the thus prepared drawn yarn were evaluated and shown in Tables 2 and 3 below.

Example 2 and Comparative Example 1

As shown in Table 1 below, a drawn yarn was prepared by performing an experiment in the same manner as in Example 1 while changing the fineness, spinning temperature, and drawing conditions. Spinning and stretching conditions are shown in Table 1 below. The physical properties of the thus prepared drawn yarn were evaluated and shown in Tables 2 and 3 below.

For the obtained fiber, fineness, strength, 5% strength, elongation, S/F, uniformity (U%) and CPU were measured. In addition, about the obtained fabric, moisture absorption (mm/10 min), moisture absorption (%), ΔMR and contact cooling sensitivity were evaluated, and the results are shown in Tables 2 and 3 below.

test example

In Examples and Comparative Examples, the following method was used for measuring the physical properties of the polyamide yarn.

[measurement method]

1. Fineness

It measured according to JIS L-1013.

2. Sulfuric Acid Relative Viscosity (I.V.)

After dissolving 0.1 g of the sample in sulfuric acid (90%) for 90 minutes so that the concentration is 0.4 g/100 ml, transfer it to an Ubbelohde viscometer, keep it in a thermostat at 30° C. for 10 minutes, and connect the viscometer and aspirator. was used to determine the number of seconds of falling of the solution. The number of seconds of falling of the solvent was obtained in the same way, and then the R.V. value was calculated by the following equation.

3. Kang Shin-do

Using Instron 5565 (manufactured by Instron, USA), it was left under standard conditions (20° C., 65% relative humidity) for more than 24 hours in accordance with ASTM D 885, followed by a sample length of 250 mm, 300 Elongation was measured under the conditions of a tensile speed of mm/min and 20 turns/m.

4. Absorbency

It is measured by the KS K 0815.5.27 method, the Bayrek method (wicking test). After knitting a circular knitted fabric in a 32-gauge interlock double-sided circular knitting machine using the polyamide fiber of the present invention, the sample was prepared by cutting it to a width of 2.5 cm and a length of 20 cm. After immersing one part of the fabric sample by 2.5 cm in water, it is allowed to stand for 10 minutes, and the height of moisture absorbed by the fabric by capillary action is measured three times to obtain an average value.

5. Moisture absorption (%)

A knitted piece of 20 cm × 2.5 cm was taken as a sample, placed in a thermo-hygrostat at 25° C. and 90% RH, and the weight increase after 24 hours was measured, and the weight increase with respect to the initial weight was expressed in %.

6. Moisture absorption rate difference (ΔMR)

The sample is weighed and taken by weighing about 1 to 2 g in a weighing bottle, kept at 110° C. for 2 hours, dried to measure the weight (WO), and then the weight of the target material is maintained at 20° C. and 65% relative humidity for 24 hours. is measured (W65), and after holding it at 30°C and 90% relative humidity for 24 hours, the weight is measured (W90), and calculation is performed according to the following equation.

MR65=[(W65-W0)/W0]×100% (1)

MR90=[(W90-W0)/W0]×100% (2)

ΔMR=MR90-MR65 (3).

7. Contact cooling sensitivity (q-max)

After smooth-knitting, the scoured, dried, and dyed fabric specimens were subjected to a thermolabo type II measuring instrument (manufactured by Kato Tech Co, Ltd.) at room temperature 24° C., humidity 63% RH. The BT-Box was adjusted to 34°C in the room of , and the BT-Box (pressure 10g/cm2) was placed on the sample whose moisture was sufficiently controlled, and the heat flow rate per unit area at a temperature difference of 10°C was measured.

Radiation conditions chip moisture content cylinder temperature
(℃) Beam temperature
(℃) pack pressure
(kgf) GR1 speed
(temperature) GR2 speed
(temperature) comparative example 2.6 FD 1,200
ppm 250/253/255 255 120 3,500
(-) 4,200
(160℃) Example 1 high moisture absorption 1,600
ppm 250/260/265 270 180 3,200
(-) 4,800
(160℃)

Properties fineness robbery
(gf/den) 5% strength
(gf/den) Shinto
(%) S/F U% OPU comparative example 25.1 5.54 1.00 45.9 37.5 1.1 1.0 Example 1 24.8 4.75 1.07 44.6 22.1 1.0 0.8

hygroscopicity
(mm/10min) Moisture absorption (%) difference in moisture absorption
(ΔMR) contact cold sensitivity
(J/cm2/S) Comparative Example 1 normal nylon
(Navy) 37 3.2 0.6 0.236 Example 1 High moisture absorption NY (Navy) 55 5.3 2.6 0.254
(Δ0.018) Example 2 High moisture absorption NY
(White) 102 6.9 3.5 0.260
(Δ0.024)

As can be seen from the results of Tables 2 and 3, the polyamide yarn of the present invention has excellent hygroscopicity, moisture absorption rate difference, and contact cooling sensitivity while maintaining excellent physical properties of the polyamide yarn compared to general polyamide yarns.

In the above, the present invention has been described in detail only with respect to the described embodiments, but it is apparent to those skilled in the art that various changes and modifications are possible within the scope of the technical spirit of the present invention, and it is natural that such variations and modifications belong to the appended claims. .

1: Spinning Pack 2: Nozzle
3: Cooling zone 4: Melt ejection yarn
5: Emulsion applying device 6, 7: Godet roller
8: bridging device 9: winding machine

Claims (9)

It consists of a polyamide-based heteromorphic fiber containing polyetherdiamine in an amount of 10-50 wt% with respect to polyamide, and contains an organophosphorus compound containing phosphonic acid as a heat-resistant agent, and under an environment of 30°C and 90% RH The moisture absorption rate after holding for 24 hours is 4% to 8%, and the hygroscopicity measured by the Byrek method (Wicking Test) is 50 to 120 mm/10 minutes,
The polyamide fiber has a strength of 4.0 gf/den or more, an elongation of 35% to 45%, and a moisture absorption difference (ΔMR) obtained by subtracting a moisture absorption rate at 20°C 65% RH from a moisture absorption rate at 30°C 90% RH Highly hygroscopic polyamide fiber, characterized in that 2.0% or more.
The highly hygroscopic polyamide fiber according to claim 1, wherein the polyetherdiamine has a number average molecular weight of 1000 to 3000.
The highly hygroscopic polyamide fiber according to claim 1, wherein the polyamide fiber has a linear density of 1.0 or less per filament.
delete delete The method of claim 1, wherein the polyamide is nylon 6, nylon 11, nylon 12, nylon 46, nylon 66, nylon 666, nylon 69, nylon 610, nylon 612, nylon 96, nylon 99, nylon 910, nylon 912, nylon 1212, nylon 6T, nylon 9T, nylon 10T, nylon 12T, nylon 6I, nylon 9I, nylon 10I, nylon 12I, and copolymers and mixtures thereof.
A polyamide chip containing polyetherdiamine in an amount of 10 to 50 wt% with respect to polyamide and containing an organophosphorus compound containing phosphonic acid as a heat-resistant agent was adjusted to have a moisture content of 1,600 to 1,800 ppm, and then with a spinneret. Conditions satisfying the following conditions (1) to (7) in the production of polyamide fibers by the direct spinning drawing method in which spinning, cooling and solidification with cooling air, attaching a spinning oil agent, stretching, and then winding Method for producing high hygroscopic polyamide yarn, characterized in that spinning under
(1) Cylinder temperature: 250℃ to 265℃
(2) Beam temperature: 263℃
(3) Pack pressure: 120kgf
(4) First godet roller discharge linear speed: 3000 m/min or more and 3500 m/min or less
(5) first godet roller temperature: room temperature
(6) Second godet roller discharge linear speed: 3500 m/min or more and 3800 m/min or less
(7) 2nd godet roller temperature: 165℃ A textile product comprising the highly hygroscopic polyamide fiber of any one of claims 1, 2, 3 and 6.
The textile product according to claim 8, wherein the textile product is innerwear.

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