KR20160001996A - Polyester Water-Repellent Yarn and Method for Manufacturing The Same - Google Patents

Abstract

The present invention relates to water-repellent polyester yarn and a preparing method thereof. The water-repellent polyester yarn is eco-friendly and has sufficient strength, water-repellent properties, uniformity on water-repellent performance between monofilaments, and adhesion with a coating film required for corresponding industries at the same time. The water-repellent polyester yarn includes polyester yarn and a fluorinated polymer applied to the polyester yarn. The fluorinated polymer includes a repeated unit having six carbons directly bonded to fluorine. The preparing method of the water-repellent polyester yarn includes: (1) a two-step process enabling a slow winding operation and a slow drawing operation; and (2) an aging process executed at a relatively low temperature of 50-80°C for a long time (10-30 hours).

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a polyester yarn,

More particularly, the present invention relates to a method for producing polyester yarn and a method for producing the same, and more particularly, to a polyester yarn having excellent properties such as strength, water repellency, uniformity of water repellency between monofilaments, And to a method for producing the same.

Fabrics woven with industrial polyester yarns are coated with PVC for protection from external environments and then used as fabrics for stadium dome and tents. However, when the coated fabric is cut for the production of an article, the polyester yarn located at the corresponding portion of the fabric is exposed to the external environment, thereby causing a problem of contamination of the portion.

In order to overcome such a problem, water repellency imparted to the yarn itself has been proposed, and such a water repellent has been widely applied to various structures exposed to the external environment.

The water repellent material, which is mainly used in the production of foot polystyrene, is a water repellent material based on C8 telomer (hereinafter referred to as "C8 water repellent material") in which C8 telomers contain 8 carbon atoms and 17 fluorine atoms ≪ / RTI > However, since PFOA (perfluorooctanoic acid: C ₇ F ₁₅ COOH), which is an environmentally harmful substance, is generated in the production of C 8 water repellent material, research on a water repellent agent capable of replacing it is proceeding.

 One of the most actively studied water repellent materials that can replace the C8 water repellent material is a water repellent material based on a C6 telomer containing six carbon atoms and 13 fluorine atoms (hereinafter referred to as "C6 water repellent" )to be.

However, since the fluorine content of the C 6 water repellent material is about 24% lower than that of the C 8 water repellent material, the water repellent material to which the C 6 water repellent material is applied has a problem that it has a lower water repellency than that of the C 8 water repellent material. Therefore, the present inventors thought that it is necessary to improve the existing processes in order to produce a polyester footstock having a water-repellent performance comparable to or better than that of the C8 water repellent material despite the use of the C6 water repellent material. Conventional methods for making polyester footprints include the following.

Korean Patent Laid-Open Publication No. 10-1999-0065606 proposes coating the foot fluid while stretching the non-drawn filament. However, when the foot fluid is applied during the drawing process, the water repellent performance between the filaments becomes uneven and the heat treatment time is short, Expression does not work properly.

Korean Patent Laid-Open Nos. 10-2000-0039595, 10-2003-0062777, and 10-2004-0061585 differ from each other only in the timing of imparting water-repellent agents, and all of them are applied in the direct spinning drawing (DSD) Do. However, under the DSD method, since the water repellent agent is separated from the yarn at the time of applying the water repellent agent or after the water repellent agent is applied, the moving speed of the yarn is too high (3000mpm or more) so that satisfactory water repellent performance can not be obtained and water repellent performance becomes uneven .

Korean Patent Laid-Open Publication No. 10-2005-0069246 proposes that a water repellent agent is applied while re-winding an already existing polyester yarn and heat treatment is performed using a hot roller, but the water repellency performance between the monofilaments can not be avoided However, since the heat treatment time is too short, the water repellent performance can not be exhibited properly.

Accordingly, the present invention relates to a polyester footstep and a method for producing the same, which can prevent problems due to limitations and disadvantages of the related art.

One aspect of the present invention is to provide a high strength and low shrinkage polyester which is environmentally friendly and which can simultaneously satisfy the strength required for industry, water repellency, water repellency uniformity between monofilaments, and adhesion to a coating film To provide footnotes.

Another aspect of the present invention is to provide a high strength and low shrinkage polyester which is environmentally friendly and which can simultaneously satisfy the strength required in the industry, water repellency, water repellency uniformity between monofilaments, And to provide a method of manufacturing foot pliers.

Other features and advantages of the invention will be set forth in the description which follows, or may be learned by those skilled in the art from the description.

According to one aspect of the present invention, there is provided a polyester yarn comprising a polyester yarn and a fluorine-based polymer imparted to the polyester yarn, wherein the fluorine-based polymer has a repeating unit having six carbon atoms directly bonded to fluorine Wherein the fluorine content in the polyester yarn is in the range of 400 to 500 ppm and has a fineness of 500 to 2000 deniers and a wicking number of 20 mm or less.

The polyester water repellent yarn includes a plurality of monofilaments, and the water repellency nonuniformity between the monofilaments defined by the following formula 1 may be 10% or less.

Equation 1: Water repellency non-uniformity (%) = [(WR _max - WR _min ) / WR _max ] x 100

Here, the WR WR _max and _min are the maximum water repellency of the monofilament of the polyester to the investigation and to be minimum.

The repeating unit may be perfluoroalkyl acrylate having only six carbon atoms directly bonded to fluorine.

The fluorine-based polymer may further include an alkyl acrylate repeating unit and / or a vinyl chloride repeating unit.

According to another aspect of the present invention, there is provided a process for producing a polyester non-drawn yarn; Stretching the polyester undrawn yarn to obtain a polyester yarn; And aging the polyester stretch yarn, wherein during the step of preparing the polyester undrawn yarn, a fluorinated polymer containing a repeating unit having six carbon atoms which is directly bonded to fluorine is imparted to the polyester undrawn yarn , The step of preparing the polyester undrawn yarn, the step of stretching, and the step of aging are performed discontinuously.

The repeating unit may be a perfluoroalkyl acrylate repeating unit, and the fluorinated polymer may further include at least one of an alkyl acrylate repeating unit or a vinyl chloride repeating unit.

The step of preparing the polyester undrawn yarn comprises the steps of spinning the molten polyester through a spinneret; Applying a mixed liquid containing a water repellent agent and a radial emulsion to the monofilaments discharged from the spinneret; Collecting monofilaments to which the mixed solution is applied to form an unstretched multifilament; And winding the undrawn yarn at a low speed of 500 to 900 mpm.

The mixed liquid may contain 7 to 15 wt% of the radial emulsion, 5 to 15 wt% of the water repellent agent, and 70 to 90 wt% of pure water, 1% by weight.

Wherein the stretching step comprises: unwinding the undrawn yarn; Performing a multi-step stretching and heat treatment of the unwound unstirred yarn using a plurality of groups of godet rollers and a plurality of hot air ovens, wherein the total stretching ratio provided by the godet rollers of the plurality of groups is 5 to 6; And winding the drawn yarn formed through the multi-stage stretching and heat treatment steps on the bobbin.

Wherein the undrawn yarn is divided into a first group of godet rollers, a second group of godet rollers, a first hot air oven, a second hot air oven, a third group of godet rollers, a third hot air oven, a fourth hot air oven, The multi-stage stretching and heat treatment steps can be performed while sequentially passing four groups of godet rollers.

The godet rollers of the first to fourth groups may be respectively maintained at 90-110 ° C, 110-130 ° C, 40-70 ° C, and 40-70 ° C, respectively, 150 to 180 mpm, 200 to 300 mpm, and 200 to 300 mpm, respectively, in the rollers, and the first to fourth hot air ovens can move at 240 to 255 ° C, 240 to 255 ° C, 255 to 265 ° C , And 255-265 ° C, respectively.

The aging step may be performed by leaving the drawn yarn wound on the bobbin in an aging chamber at 50 to 80 DEG C for 10 to 30 hours while being wound on the bobbin.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are intended to provide further explanation of the invention as claimed.

The polyester water repellent of the present invention includes a polyester yarn and a fluoropolymer imparted to the polyester yarn, wherein the fluoropolymer is a C6 water repellent material including a repeating unit having six carbon atoms directly bonded to fluorine. Therefore, the polyester water repellent of the present invention is an environmentally friendly product that does not cause harmful substances such as PFOA.

Further, according to the present invention, since the mixed liquid of the radial emulsion and the water repellent agent is uniformly applied to the monofilaments before the monofilaments formed through the spinning process are focused, uniform water repellency performance between the monofilaments .

In addition, the polyester water repellent yarn can be produced by a process comprising the steps of: 1) a two-step process allowing slow winding and slow drawing; and 2) By the aging process performed for a long time (10 to 30 hours), the detachment of the water repellent once applied is minimized, so that the uniformity of the water repellency performance between the monofilaments is improved and the contamination due to the dropped water repellent agent can be minimized. In addition, it is possible to maximize the water content in comparison with the water repellent agent content without lowering the total stretching ratio (that is, without lowering the strength)

In addition, the polyester water repellent of the present invention has better adhesion to the coating film (i.e., better peel strength between the fabric made from the water repellent yarn and the PVC coated film) than that of the C8 water repellent material applied.

In summary, the polyester yarn monofilaments produced by the present invention have uniform water repellency. The polyester water repellent produced by the present invention has water repellency performance equal to or higher than that of the C8 water repellent material applied even though the C8 water repellent material is applied, and has an excellent adhesion to the coating film.

BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and, together with the description, serve to explain the principles of the invention.
Fig. 1 illustrates a process for producing a polyester undrawn yarn,
Fig. 2 illustrates the stretching and heat-treating step of the polyester undrawn yarn,
Figure 3 illustrates the aging process of a polyester stretch yarn.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the polyester yarn of the present invention and its production method will be described in detail with reference to the accompanying drawings.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit and scope of the invention. Therefore, the present invention encompasses all changes and modifications that come within the scope of the invention as defined in the appended claims and equivalents thereof.

The polyester water repellent of the present invention includes a polyester yarn and a fluorinated polymer imparted to the polyester yarn.

The fluoropolymer of the present invention for imparting water and oil repellency to the polyester yarn is a C6 water repellent material containing a repeating unit having only 6 carbon atoms directly bonded to fluorine. C8 water repellent substances that cause human harmful substances are not included in the polyester release yarn of the present invention. Therefore, the polyester water repellent of the present invention is an environmentally friendly product that does not cause harmful substances such as PFOA.

The repeating unit may be perfluoroalkyl acrylate having six carbon atoms directly bonded to fluorine.

The fluorine-based polymer may further include an alkyl acrylate repeating unit and / or a vinyl chloride repeating unit. The acrylate repeating unit improves the film-forming property of the fluorinated polymer (the property that makes the resin particles easily aggregate after the water evaporates). The vinyl chloride repeating unit enhances the adhesion to the PVC film. Therefore, when the PVC film is coated on the fabric woven with the polyester water repellent of the present invention, the peeling strength between the fabric and the PVC film can be increased.

If there above fluorinated polymer comprising the same repeating unit (s) can all be applied to the present invention, for example, a commercially DAIKIN Corp. UNIDYNE ^® TG-5541 is marketed, may be used.

C5 water repellent material has a fluorine content of about 24% lower than that of the C8 water repellent material, the polyester water repellent of the present invention, which is produced by the novel method described below, is a polyester produced by a conventional process using a C8 water repellent material And contains 400 to 500 ppm of fluorine, which is equivalent to the fluorine content of the foot polystyrene.

The fluorine content is preferably 400 ppm or more so that the footstock and the fabric woven with the water repellant exhibit a sufficient water repellency. However, since the fluorine lowers the adhesion with the coating film in proportion to the degree of improving the water repellency, the fluorine content is preferably 500 ppm or less.

The polyester water repellent of the present invention has a fineness of 500 to 2000 denier, an intensity of 7 to 8 g / d, a cut elongation of 20 to 25%, a dry heat shrinkage of 0.5 to 1.5%, and a water footing of 20 mm or less.

The polyester water repellent of the present invention includes a plurality of monofilaments, and the water repellency nonuniformity between the monofilaments defined by the following formula 1 is 10% or less.

Equation 1: Water repellency non-uniformity (%) = [(WR _max - WR _min ) / WR _max ] x 100

Here, the WR WR _max and _min are the maximum water repellency of the monofilament of the polyester to the investigation and to be minimum.

As used herein, "water repellency" of polyester yarn and monofilaments thereof means the values measured by the following methods.

After 24 hours have elapsed under immersion in a 0.1 wt% aqueous solution of methylene blue with a load of 0.01 g / d for immersion, the methylene blue dyes have elevated heights along the monofilaments By measurement, the yield of each monofilament is obtained. The footprint of the polyester footstep is the average water repellency and the maximum water repellency of the monofilament of the polyester footstep.

The polyester water repellent of the present invention is a two-step process which enables slow winding and slow drawing, and a long-time (10 to 20 minutes) process at a relatively low temperature of 50 to 80 DEG C after the two- 30 hours). ≪ / RTI >

Hereinafter, the method for producing polyester yarn of the present invention will be described in detail with reference to Figs. 1 to 3. Fig.

FIG. 1 illustrates the first step of the two-step process, FIG. 2 illustrates the second step of the two-step process, and FIG. An example of the aging process of a polyester stretch yarn is illustrated.

According to the present invention, the polyester undrawn yarn manufacturing step, the stretching step, and the aging step are performed discontinuously.

1, an apparatus according to an embodiment of the present invention for manufacturing polyester undrawn yarn 10 includes extruder 110, spinneret 120, oil roller 130, 140, and a bobbin 150.

First, a polyester (e.g., PET) chip having an intrinsic viscosity of 0.8 to 1.5 dl / g is put into the extruder 110 and then melted, and the molten polyester is fed through the spinneret 120 . As soon as the polyester is solidified upon ejection from the spinneret 120, a plurality of monofilaments 11 are formed.

Next, a mixed liquid containing a water repellent agent containing the fluorinated polymer and a spinning oil agent is applied to the plurality of monofilaments 11 discharged from the spinneret 120 using the oil roller 130. Alternatively, the mixed liquid may be supplied by MO (Metered Oiling) method instead of RO (Roller Oiling) method.

According to the present invention, the C 6 water repellent material is imparted to the polyester undrawn yarn (more specifically, the monofilaments 11 before being converged) during the polyester undrawn yarn production step. The pickup ratio of the mixed liquid may be 0.4 to 1 wt%. The water repellent agent (more specifically, the fluorinated polymer) can be uniformly provided to the monofilaments 11 because the mixed liquid is applied in a state in which the monofilaments 11 are spread before being focused, , The uniform water repellency between the monofilaments of the final footstep can be assured.

As described above, the fluorine-based polymer is a C6 water-repellent material including a repeating unit having only 6 carbon atoms directly bonded to fluorine (a specific description of the C6 water-repellent material is replaced by the foregoing description).

Any emulsions conventionally used in the production of polyester yarns may be used as the spinning emulsions of the present invention. For example, KMP-3568 from Matsumoto yushi-seiyaku, which is commercially available, can be used.

The mixed solution may be prepared by mixing a water repellent agent containing 25 to 35% by weight of the fluorine-based polymer and 60 to 70% by weight of water with the spinning emulsion and water. For example, the mixed solution may contain 5 to 15% by weight of the water repellent agent, 7 to 15% by weight of the radial emulsion, and 70 to 88% by weight of pure water.

If the content of the water repellent agent is less than 5% by weight, the repellency of the water repellent agent becomes low. If the water repellent agent is more than 15% by weight, adhesion of the repellent film to the coating film is deteriorated.

If the content of the spinning emulsion is less than 7% by weight, there arises a problem that a lot of molasses is generated in the subsequent multi-stage stretching process. On the other hand, when the content of the radial emulsion is more than 15% by weight, the adhesive strength of the drawn yarn to the coating film is lowered.

Then, the monofilaments 111 to which the mixed solution is applied are collected by the focusing unit 140, thereby forming the non-drawn filament 10 of the multifilament type.

Then, the undrawn yarn is wound on the bobbin 150 at a low speed of 500 to 900 mpm.

Since the stretching process is not carried out in the step of producing the polyester undrawn yarn 10 of the present invention, the winding speed is the spinning speed. The water repellent agent-added unstretching yarn 10 moves at a low speed of 500 to 900 mpm, so that the deterioration of the water repellent agent during the manufacturing process of the polyester undrawn yarn 10, .

Then, a step of stretching the polyester undrawn yarn 10 wound on the bobbin 150 is carried out.

As illustrated in FIG. 2, an apparatus according to one embodiment of the present invention for stretching polyester undrawn yarn 10 comprises first to fourth godet rollers 210, 220, 230 , 240, first to fourth hot air ovens 310, 320, 330, 340, and a bobbin 410.

First, a bobbin 150 on which a polyester undrawn yarn 10 is wound is mounted on a creel, and unwinding of the undrawn yarn 10 is performed.

Next, the unwound unstirred yarn 10 is wound around the godet rollers 210, 220, 230, 240 and the first to fourth hot air ovens 310, 320, 330, 340 of the first to fourth groups Multi-stage stretching and heat treatment / heat fixation.

That is, as illustrated in FIG. 2, the undrawn yarn 10 is divided into the first group of godet rollers 210, the second group of godet rollers 220, the first hot air oven 310, The oven 320, the third group of godet rollers 230, the third hot air oven 330, the fourth hot air oven 340, and the fourth group of godet rollers 240, Stretching and heat treatment / heat fixing steps are performed.

The multi-step stretching is performed by the godet rollers 210, 220, 230, 240 of the first to fourth groups, and the total stretching ratio provided by them may be 5 to 6.

According to an embodiment of the present invention, the yarn moving speed between the unit rollers 211 of the godet rollers 210 of the first group unwinding the undrawn yarn 10 from the krill is 40-60 mpm And the yarn movement speed between the unit rollers 221 of the godet rollers 220 of the second group is 150-180 mpm and the unit rollers 230 of the godet rollers 230 of the third group The yarn moving speed between the unit rollers 241 of the godet rollers 240 of the fourth group is 200-300 mpm.

According to the present invention, since the step of producing the polyester undrawn yarn 10 and the step of multi-step stretching the polyester undrawn yarn 10 are discontinuously performed, The yarn moving speed in the drawing process may be significantly lower than the yarn moving speed (3000 mpm or more) in the conventional direct radiation drawing (DSD) method, and as a result, the water repellent agent may be dropped off, The contamination of the equipment, the deterioration of the water repellency performance, and the irregularity of the water repellency performance can be prevented as much as possible.

The heat treatment / heat fixing step performed at the same time as the elongating step may be performed by the godet rollers 210, 220, 230, 240 and the first to fourth hot air ovens 310, 320, 330, 340).

The godet rollers 210, 220, 230 and 240 of the first to fourth groups are heated to a temperature of 90-110 ° C, 110-130 ° C, 40-70 ° C, and 40-70 ° C Respectively, and the first to fourth hot air ovens can be maintained at 240-255 ° C, 240-255 ° C, 255-265 ° C, and 255-265 ° C, respectively.

Then, the drawn yarn 20 formed through the multi-stage stretching and heat treatment steps is wound on the bobbin 410.

Next, aging of the drawn yarn 20 wound on the bobbin 410 is performed without unwinding the drawn yarn 20.

3, in the aging step of the present invention, the stretching yarn 400 in a state of being wound on the bobbin 410 is left in the aging chamber 500 at 50 to 80 ° C for 10 to 30 hours .

Hereinafter, the present invention will be described in detail with reference to examples and comparative examples. It should be noted, however, that the following examples are intended to assist the understanding of the present invention and should not limit the scope of the present invention thereby.

Example

A polyethylene terephthalate (PET) undrawn filament (1000 Denier / 192 fil) was made using the apparatus of FIG. 1 and the following materials and conditions.

* Intrinsic viscosity of PET chip: 0.83 dl / g

* Water repellent: UNIDYNE ^® TG-5541 from DAIKIN

* Radial emulsion: KMP-3568 from Matsumoto yushi-seiyaku

* Mixed liquid: water repellent agent (8.2% by weight) + spinning emulsion (10.9% by weight) + pure water (80.9% by weight)

Giving mixed liquid to the monofilaments before being focused

* Pick-up rate of mixed liquid: 0.55 wt%

* Unsteady yarn winding speed (spinning speed): 790mpm

Next, the PET undrawn yarn was subjected to a multi-stage stretching and heat treatment / heat fixing process using the apparatus of FIG. 2 and the conditions shown in Table 1 below to produce PET drawn yarn.

The first G / R
(210) The second G / R
(220) 1st
Oven
(310) Second
Oven
(320) Third G / R
(230) Third
Oven
(330) Fourth
Oven
(340) Fourth G / R
(240) Temperature
(° C) speed
(mpm) Temperature
(° C) speed
(mpm) Temperature
(° C) Temperature
(° C) Temperature
(° C) speed
(mpm) Temperature
(° C) Temperature
(° C) Temperature
(° C) speed
(mpm) 110 48.7 121 170.5 251 253 50 287.9 263 263 40 256.0

(* G / R: Godet roller, * Speed: moving speed of yarn)

Then, the PET drawn yarn was left in an aging chamber maintained at 80 DEG C in a state of being wound on a bobbin for 24 hours to complete PET footing.

Comparative Example  One

PET unstretched yarn was prepared in the same manner as in the above example except that the mixed solution was applied to the non-drawn filament of the multifilament type, and the PET unstretched yarn thus produced was directly drawn without being wound (that is, The PET footprint was completed. The stretching process was performed by the first to sixth Kodetch rollers under the conditions shown in the following Table 2.

The first G / R The second G / R Third G / R Fourth G / R Fifth G / R 6th G / R Temperature
(° C) speed
(mpm) Temperature
(° C) speed
(mpm) Temperature
(° C) speed
(mpm) Temperature
(° C) speed
(mpm) Temperature
(° C) speed
(mpm) Temperature
(° C) speed
(mpm) 80 560 110 570 120 2150 220 3025 170 3010 100 3010

Comparative Example  2

* And a are PET to investigations in the same manner as in the above Comparative Example 1 except that was used DAIKIN Corp. UNIDYNE ^® TG-580, including the C8-repellent material in place ^® UNIDYNE TG-5541 was completed as a water repellent agent.

The tensile strength, cut elongation, water repellency, water repellency non-uniformity between monofilaments, and adhesion to the coating film of the PET water repellents prepared by Examples and Comparative Examples 1 and 2 were measured by the following methods / ≪ / RTI > and the results are shown in Table 3 below.

PET Footstep The tensile strength  And Truncation

The tensile strength (g / d) and elongation at break (%) of the PET yarn were measured using a universal tensile tester of Instron Engineering Corp. (Canton, Mass.) According to the ASTM D885 method.

PET Footstep Water repellency  And Monofilaments  Liver Water repellent Non-uniformity

After the PET roughening with a load of 0.01 g / d for immersion was immersed in a methylene blue aqueous solution having a concentration of 0.1% by weight, the heights of the methylene blue dyes ascending along the monofilaments were measured Thereby obtaining water repellency (mm) of each monofilament.

The water repellency of the PET footprint was obtained by calculating the average value of the maximum water repellency (WR _max ) and the minimum water repellency (WR _min ) of the monofilaments. The water repellency uniformity of the PET footprint monofilaments .

Equation 1: Water repellency non-uniformity (%) = [(WR _max - WR _min ) / WR _max ] x 100

PET Footstep  Adhesion to coating film

The fabric was woven with a PET water repellent (warp density: 20 / inch, weft density: 22 / inch) and the fabric was coated with PVC. Then, the peel strength (dN / 5 cm) was measured according to Method 2 of ISO-2411 for a sample of 15 cm * 5 cm (length * width).

The tensile strength
(g / d) Truncation
(%) Water repellency
(mm) Between monofilaments
Water repellency non-uniformity (%) Peel strength
(dN / 5 cm) Example 7.5 23.0 17 10 13 Comparative Example 1 8.1 24.0 50 35 10 Comparative Example 2 8.1 24.0 40 30 9.5

10: Miso gentleman 20: Opening gentleman
110: Extruder 120: spinning detention
130: Oil roller 140:
150: Bobbin
210, 220, 230, 240: godet rollers of the first to fourth groups
310, 320, 330, 340: first to fourth hot air ovens
410: Bobbin 400: Kinship wound on bobbin
500: Aging Room

Claims (13)

A polyester yarn comprising a polyester yarn and a fluorine-based polymer imparted to the polyester yarn,
Wherein the fluorine-based polymer comprises a repeating unit having six carbon atoms directly bonded to fluorine,
The fluorine content in the polyester yarn is 400 to 500 ppm,
Characterized by having a fineness of from 500 to 2000 denier and a wicking number of not more than 20 mm. The method according to claim 1,
Said polyester water repellent yarn comprising a plurality of monofilaments,
Characterized in that the water repellency non-uniformity between the monofilaments defined by the following formula (1) is 10% or less:
Equation 1: Water repellency non-uniformity (%) = [(WR _max - WR _min ) / WR _max ] x 100
Where, WR WR _max and _min are the maximum being water-repellent of the monofilament of the polyester to the investigation and to be minimum. The method according to claim 1,
Wherein the repeating unit is a perfluoroalkyl acrylate having six carbon atoms directly bonded to fluorine. The method according to claim 1,
Wherein the fluorinated polymer further comprises an alkyl acrylate repeating unit. The method according to claim 1,
Wherein the fluorinated polymer further comprises a vinyl chloride repeating unit. Producing a polyester undrawn yarn;
Stretching the polyester undrawn yarn to obtain a polyester yarn; And
Aging the polyester stretch yarn,
A fluorinated polymer containing a repeating unit having six carbon atoms which is directly bonded to fluorine is imparted to the polyester undrawn yarn during the polyester non-drawn yarn producing step,
Wherein the step of preparing the polyester undrawn yarn, the step of stretching, and the step of aging are carried out discontinuously. The method according to claim 6,
Wherein the repeating unit is a perfluoroalkyl acrylate repeating unit,
Wherein the fluoropolymer further comprises at least one of an alkyl acrylate repeating unit or a vinyl chloride repeating unit. The method according to claim 6,
The step of preparing the polyester undrawn yarn comprises:
Radiating the molten polyester through a spinneret;
Applying a mixed liquid containing a water repellent agent and a radial emulsion to the monofilaments discharged from the spinneret;
Collecting monofilaments to which the mixed solution is applied to form an unstretched multifilament; And
And winding the undrawn yarn at a low speed of 500 to 900 mpm. 9. The method of claim 8,
Wherein the mixed solution comprises 7 to 15 wt% of the radial emulsion, 5 to 15 wt% of the water repellent agent, and 70 to 88 wt% of pure water,
Wherein the pickup ratio of the mixed solution to the non-drawn yarn is 0.4 to 1% by weight. 9. The method of claim 8,
In the stretching step,
Unirrading the undrawn yarn;
Performing a multi-step stretching and heat treatment of the unwound unstirred yarn using a plurality of groups of godet rollers and a plurality of hot air ovens, wherein the total stretching ratio provided by the godet rollers of the plurality of groups is 5 to 6; And
And winding the drawn yarn formed through the multi-stage stretching and heat treatment steps on the bobbin. 11. The method of claim 10,
Wherein the undrawn yarn is divided into a first group of godet rollers, a second group of godet rollers, a first hot air oven, a second hot air oven, a third group of godet rollers, a third hot air oven, a fourth hot air oven, Wherein the multi-stage stretching and heat treatment steps are performed while sequentially passing through the four groups of godet rollers. 12. The method of claim 11,
The godet rollers of the first to fourth groups are maintained at 90-110 DEG C, 110-130 DEG C, 40-70 DEG C, and 40-70 DEG C, respectively,
The undrawn yarn is moved at a speed of 40-60mpm, 150-180mpm, 200-300mpm, and 200-300mpm in the godet rollers of the first to fourth groups, respectively,
Wherein the first to fourth hot air ovens are maintained at 240-255 ° C, 240-255 ° C, 255-265 ° C, and 255-265 ° C, respectively. 11. The method of claim 10,
Wherein the aging step is performed by leaving the drawn yarn wound on the bobbin in an aging room at 50 to 80 DEG C for 10 to 30 hours in a state of being wound on the bobbin.

Images