KR101414206B1 - C-shaped cross-section with a hollow fiber and method for manufacturing thereof - Google Patents

Abstract

The present invention relates to a C-shaped hollow fiber and a manufacturing method thereof. More particularly, hollow is not destroyed in a manufacturing process as the C-shaped hollow fiber has excellent strength, and the present invention can maximize thermal insulation and lightness as the C-shaped hollow fiber has hollowness improved greatly compared with traditional hollow fibers. Moreover, dyeing defects by uneven elution are not generated as easily soluble polymeric materials do not remain in manufactured C-shaped hollow fibers, and decrease in the performance of the hollow fibers can be minimized as the hollow is not decreased by uneluted easily soluble polymers. Moreover, the intrinsic functions of the hollow fibers such as thermal insulation and lightness can be fully realized as the hollows in the fibers are not destroyed and the shapes of the hollows are not changed after postprocessing and weaving if the specific conditions of the present invention are satisfied, and the C-shaped hollow fibers have excellent quality as the C-shaped hollow fibers are not attacked by alkali in the process of elution.

Description

C-shaped hollow fiber and method for manufacturing the same

The present invention relates to a C-type hollow fiber and a method for producing the same, and more particularly, to a hollow fiber having improved hollow ratio and excellent strength and elongation, And a method of manufacturing the same.

BACKGROUND ART Synthetic fibers such as polyester and polyamide are widely used not only for clothing but also for industrial use due to their excellent physical and chemical properties and have industrially important values. However, these synthetic fibers have a single monofilament fineness distribution, and have drawbacks in that they are different from natural fibers such as hemp, cotton, etc. in terms of warmth, and in order to improve such drawbacks, have.

It is an old technology that has already been filed for a basic patent in 1956. The merit of hollow fiber is that light weight can be felt due to weight reduction due to weight reduction for hollow part. In addition, since the air exists in the hollow portion, the thermal conductivity can be maintained by using the low thermal conductivity of the air. The purpose of giving warmth to clothing as a fiber aggregate was to obtain a material which is light, thin and excellent in warmth. Therefore, hollow fiber is widely used to solve the disadvantage that the weight increases as the clothes are thickened in winter, and the thermal insulation is lowered when the weight is reduced

Generally, a hollow fiber having a high hollow fiber content has a small specific gravity and excellent heat retention because it contains many air layers. Therefore, it has excellent characteristics that give a light feeling of warmth and is widely used in mountaineering clothes, sportswear, functional clothes, quilt, thermal insulation quilts, sleeping bags and the like.

In general, a method of producing a hollow fiber is widely used in which a polymer is discharged from an unconnected slit and fusing is performed before completely solidified, thereby forming a hollow by incorporating the outside air into the central portion.

Meanwhile, the hollow fiber produced by discharging the polymer through the slit which is not connected as described above and fusing it before complete solidification, if the hollow ratio is 30% or more, the cross section easily collapses after the post- It is mostly used in filament form because it can be bonded (disappearance of hollow part) or it is used through spinning after cutting with staple (short fiber).

However, when used as a filament, the rebound resilience through the hollow is increased, which makes it difficult to develop a general purpose circular knitted fabric for use as a garment, and a slippery feel and drape for use as a garment. Further, even in the case of the brushed material, it has a disadvantage that the bulging property is lowered, the surface of the hollow fiber is smooth, and the repulsive elastic force is excellent. Further, even in the case of composite with other fibers, the lightness and warmth, which are characteristics of the hollow, are reduced by half, and the fineness of the fabric due to the composite yarn is increased.

Another method is to make fibers by stapling and spinning. When spinning is carried out, it is excellent in touch, strength is increased, and it is possible to develop it for various purposes because it is easy to be compounded with other fibers, but it is expensive to manufacture staple (short fiber) and has a problem of poor peeling property . In addition, since the spinning process must be repeated again, spinning equipment must be separately provided, and time and cost burden due to the addition of the process may also occur.

In the case of filaments for general garments, the tactile feel is improved through post-processing such as quasi- processing, in order to overcome the above problems. However, this twisting process has the disadvantage that the hollow is distorted in the case of the hollow fiber because it gives twist through a lot of tension at a high temperature. Particularly, when the hollow fiber has a hollow ratio of 30% or more, there is a problem that the outer wall of the fiber surrounding the hollow portion is thin, so that the adhesion phenomenon occurs relatively easily. On the other hand, when the hollow portion of the hollow fiber has a hollow ratio of less than 30%, the void ratio of the hollow filament after the post-treatment such as the twisting process is low, so that the void ratio is less than 5% after the false twisting process .

As a method for solving such a problem, a method using an elution type hollow fiber has been attempted, and an elution type hollow fiber can be present without a hollow collapse because it is subjected to a leaching process before a dyeing process after a post-treatment such as a tentative process.

However, the hollow fiber may exist but the strength of the pre-eluting composite fiber is lower than that of the single-spun hollow fiber, and when the elution is completed, the strength of the fabric is lowered due to the lowering of the sheath portion, . In the case of the conventional C-type hollow fiber including one open slit, the hollow is liable to be deformed and broken by external force as compared with the hollow fiber without slit, and further, the hollow is opened to one side of the hollow fiber There is a problem that hollow collapse is more likely to occur when deflected toward the slit.

In addition, the hollow fiber of the conventional hollow fiber has a level of less than 30%, and it is difficult to expect effects such as warmth and lightness.

In order to solve the above problems, it is difficult to produce a hollow fiber having a hollow ratio of 30% or more even if it is attempted to produce a hollow fiber having an improved hollow ratio in order to maximize warmth and lightness. Further, when the hollow ratio is increased, the strength of the composite fibers and / or the hollow fibers before they are made into hollow fibers is further lowered. Further, when only the hollow ratio is increased, the elution time is prolonged in the elution process using an alkali solution, and the elution is not properly performed, resulting in defective dyeing due to uneven elution and hollow reduction.

Furthermore, the extended elution process time causes alkaline infiltration of the synthetic resin contained in the sheath portion of the C-type hollow fiber, which leads to deterioration of the quality of the C-type hollow fiber.

Korean Patent Application No. 2007-0051838 discloses a polyester hollow fiber having excellent tear strength and abrasion resistance and a hollow fiber produced by using a spinneret composed of two or more slits arranged apart from each other, have. In the prior art of the above-mentioned patent application, in case of the C type having one slit, the hollow portion is not so high because the amount of air inflow is small as a distance between the slits, and even if the hollow ratio is increased, the outer wall of the yarn is thin, have. In addition, in the case of the above-mentioned patent application, it is not a manufacturing method of eluting hollow fiber through composite spinning, but after producing a hollow fiber by solidifying the polyester after spinning, there is a limit in producing a hollow fiber having a high hollow ratio. There is a problem that the strength of the hollow fiber is not maintained and the spinning workability is reduced or the hollow fiber is deformed or broken in the post-treatment process and / or the weaving process. Furthermore, in the case of the above-mentioned patent application, the hollow fiber is manufactured through the spinneret having a plurality of slits, so that the strength of the produced hollow fiber is lowered.

It is an object of the present invention to solve the above-mentioned problems. The first problem to be solved by the present invention is to provide a hollow fiber having an improved hollow ratio, thereby maximizing the effects of warmth and lightness, Which is free from deformation and breakage of the hollow fibers in the production process, and has excellent elongation and improved flexibility. Further, it is another object of the present invention to provide a method for producing a C-type conjugated fiber capable of increasing the elution rate even when the hollow rate is increased in the elution step, thereby making the time required for the elution step uniform.

The second problem to be solved is that the C type hollow fiber satisfying the specific conditions of the present invention is uniformly eluted, so that defects such as dyeing do not occur and the hollow fiber has an improved strength compared to the conventional hollow fiber, The present invention is to provide a C-type hollow fiber which can fully achieve its original function as a hollow fiber such as heat insulation and light weight, and at the same time has excellent hollow ratio and maximizes the function of the hollow fiber.

In order to solve the above-mentioned first problem, the present invention provides a method for producing a polyester resin composition, which comprises (1) a step of mixing a sheath portion containing at least one of a polyester and a polyamide resin and an acid component containing terephthalic acid (TPA) Preparing a core part containing a polyester-based synthetic resin containing a diol component and a copolymer obtained by polycondensation of an esterification reaction product comprising dimethyl sulfoisophthalate sodium salt (DMSIP) and a polyalkylene glycol; (2) composite radiation such that the core is exposed from one side of the sheath to the outside; And (3) eluting the core portion from the composite fiber to produce a C-type hollow fiber.

According to a preferred embodiment of the present invention, there is further provided a step of post-treating the C-type conjugated fiber between steps (2) and (3).

According to another preferred embodiment of the present invention, the polyester synthetic resin of the sheath of the step (1) is composed of polyethylene terephthalate (PET), polytrimethylene terephthalate (PTT) and polybutylene terephthalate May be selected.

According to another preferred embodiment of the present invention, the polyamide-based synthetic resin in the step (1) may be any one selected from the group consisting of nylon 6, nylon 66, nylon 6.10, and aramid.

According to another preferred embodiment of the present invention, the core part of the step (1) comprises a terephthalic acid-containing acid component and a diol component containing ethylene glycol in a molar ratio of 1: 1.1 to 2.0, 0.1 to 3.0 mol% of dimethylsulfuric acid isophthalate sodium salt relative to the total molar amount of the acid component and the dimethylsulfuric acid isophthalate sodium salt to prepare an esterification reaction product; And 1-2) preparing a copolymer by mixing 7 to 14 parts by weight of polyalkylene glycol with 100 parts by weight of the esterification reaction product.

According to another preferred embodiment of the present invention, in the step (2), the weight ratio of the sheath portion and the core portion may be 70:30 to 35:65.

According to another preferred embodiment of the present invention, the post-treatment may be performed by any one method selected from the group consisting of a DTY method, an air jet method, and a scratch method (knife edge method).

According to another preferred embodiment of the present invention, the elution of the core portion in the step (3) may be performed through an alkali solution.

According to another preferred embodiment of the present invention, the elution of the core portion using the alkali solution includes: 3-1) soft winding the C-type conjugated fiber by 1 to 10 sorts of yarns into a yarn core tube; And 3-2) eluting the C-type conjugate fiber wound around the quartz crucible through an aqueous solution of sodium hydroxide at 1 to 5% by weight at 80 to 100 ° C under atmospheric pressure.

In order to solve the above second problem, the present invention provides a C-type hollow fiber, wherein the C-type hollow fiber includes a slit having an open cross-section of the hollow fiber, and the C-type hollow fiber satisfying all of the following conditions to provide.

(1) 30 ≤ hollow ratio (%) ≤ 65

(2) 20 ° ≤ slit angle (θ) ≤ 30 °

(3)

(4)

Wherein the hollow ratio (%) is a percentage of the hollow cross-sectional area included in the hollow fiber with respect to the total cross-sectional area of the C-type hollow fiber, and the slit angle (?) Is a straight line connecting the center of the hollow and discontinuous points of the sheath (S) is the distance (μm) between the center of the hollow section at the center of the cross-section of the C-type hollow fiber, and the distance between the centers of the cross- R ₁ is the diameter (μm) of the entire cross-section of the C-type hollow fiber, and R ₂ is the diameter (μm) of the hollow cross-section of the C-type hollow fiber.

According to a preferred embodiment of the present invention, the C-type hollow fiber may satisfy the following condition (5).

(5)

According to another preferred embodiment of the present invention, the C-type hollow fiber may include at least one of a polyester-based synthetic resin and a polyamide-based synthetic resin.

According to another preferred embodiment of the present invention, the C-type hollow fiber is made of a partially drawn yarn (POY), a drawn yarn (SDY), a false twist yarn (DTY), an air textured yarn (ATY), an edge crimped yarn yarn and composite yarn (ITY).

According to another preferred embodiment of the present invention, when the C-type hollow fiber is partially drawn (POY), the fineness is 50 to 200 denier and may be 18 to 100 filaments.

According to another preferred embodiment of the present invention, when the C-type hollow fiber is a drawn yarn (SDY), the fineness is 50 to 200 denier and may be 18 to 100 filaments.

According to another preferred embodiment of the present invention, when the C-type hollow fiber is a false-twist yarn, it may be 50 to 1000 denier and 18 to 720 filaments.

Hereinafter, terms used in the present invention will be described.

In the present invention, the term " fiber " as used herein means " yarn " or " yarn "

In the present invention, the term 'eccentric distance' as used herein means the distance between centers of the hollows included in the entire cross section of the C-type hollow fiber at the center of the cross section of the C-type hollow fiber.

In the present invention, the term " conjugate fiber " as used herein means a fiber produced by composite spinning or a fiber obtained by a process such as stretching and twisting, and which has not been eluted.

The C-type hollow fiber of the present invention and the method of producing the same have a hollow ratio higher than that of the conventional hollow fiber to maximize the effect of the hollow fiber such as warmth and light weight, and the C- So that the deformation and breakage of the conjugated fiber hardly occurs in the post-treatment and other manufacturing processes, and thus the hollow fiber can be obtained in which the hollow is fully retained.

In addition, in the elution process for producing hollow fibers, even if the content of the core portion contained in the conjugate fiber increases, the elution rate is increased, thereby making the elution process time uniform, thereby shortening the elution process time and eluting the core portion. It is possible to obtain a C-type hollow fiber of excellent quality by minimizing the occurrence of problems such as a reduction in the number of fibers and alkali breakage of the hollow fibers.

 Further, when the specific conditions of the present invention are all satisfied, the hollow fiber has an improved hollow ratio as compared with the conventional hollow fiber, and has excellent strength and elongation, and can exhibit functions such as hollow deformation, . Also, it is possible to provide a C-type hollow fiber of excellent quality free from defective dyeing and hollow reduction due to uneven dissolution of the usable polymer.

1 is a schematic view of a C-type conjugate fiber according to a preferred embodiment of the present invention.
2 is a schematic diagram of a C-type hollow fiber according to a preferred embodiment of the present invention.
3A is a sectional view of a hollow fiber having a hollow ratio of 30% according to a preferred embodiment of the present invention.
3B is a sectional view of a hollow fiber having a hollow ratio of 40% according to a preferred embodiment of the present invention.
3C is a sectional view of a hollow fiber having a hollow ratio of 50% according to a preferred embodiment of the present invention.
FIG. 3D is a sectional view of a hollow fiber having a mesophase of 60% according to a preferred embodiment of the present invention.
FIG. 4 is a cross-sectional view of a C-type hollow fiber having a hollowed 30% hollow fiber according to a preferred embodiment of the present invention.
FIG. 5 is a cross-sectional view of a C-type hollow fiber having a hollowed-out 40% hollow fiber according to a preferred embodiment of the present invention.
6 is a cross-sectional view of a C-type hollow fiber having a twisted and hollow ratio of 50% according to a preferred embodiment of the present invention.
FIG. 7 is a cross-sectional view of a C-type hollow fiber having a hollowed 60% hollow fiber according to a preferred embodiment of the present invention.

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

As described above, in the case of the conventional C-type conjugate fiber before production of the C-type hollow fiber, since the strength is not enough to withstand the manufacturing process such as complex spinning and post-treatment, deformation of the conjugate fiber frequently occurs before the elution of the core portion This results in a problem that hollow fibers produced after elution of the core part are deformed and broken. In addition, the conventional C type hollow fiber has a low strength, so that the tear strength of the final fabric is not ensured after the manufacturing process of the weaving and the salt processing, and the tear of the fabric is often caused.

In addition, the hollow fiber of the conventional hollow fiber has a level of less than 30%, which makes it difficult to maximize the warmth and light weight of the hollow fiber.

Further, conventionally, there is a problem that it is difficult to produce a hollow fiber having a hollow ratio of 30% or more in order to maximize warmth and light weight, and when the hollow ratio is increased, the strength of the composite fiber and / or the hollow fiber produced therewith is further reduced There is a problem that the process of stretching the yarn, the partial stretching, the false twisting process, and the weaving process for making the fabric can not be further endured.

Furthermore, when only the hollow ratio is increased, the elution time is prolonged in the elution process using an alkali solution, and the elution is not properly performed. Thus, there are problems such as defective dyeing and hollow reduction due to uneven elution, There has been a fatal problem in that the synthetic resin contained in the sheath portion of the hollow fiber has an alkali attack, which leads to deterioration of the quality of the hollow fiber.

(1) an acid component containing terephthalic acid (TPA), a sheath containing at least one of polyester and polyamide, a diol component containing ethylene glycol (EG) Preparing a core portion containing a polyester-based synthetic resin including a copolymer obtained by polycondensation of an esterification reaction product comprising a dimethyl sulfoisophthalate sodium salt (DMSIP) and a polyalkylene glycol; and (2) Radiating the core so that the core portion is exposed from one side of the sheath to the outside; And (3) eluting the core part from the composite fiber to produce a C-type hollow fiber. The present invention has been made to solve the above-mentioned problems.

Accordingly, it is possible to maximize the effect of the hollow fibers such as warmth and light weight by having the conventional improved hollow ratio, and at the same time, the C type conjugated fiber according to the present invention has an improved strength, It is possible to obtain a hollow fiber in which the hollow is completely retained without causing the breakage to occur.

Further, in the elution step for producing hollow fibers, even if the content of the core part contained in the conjugate fiber is increased, the elution rate is improved, thereby making the elution process time uniform, shortening the elution process time and eluting all the core part, , Hollow reduction, and alkali infiltration of the hollow fiber are minimized, and thus a C-type hollow fiber of excellent quality can be obtained.

First, the sheath portion and the core portion are prepared as step (1).

The synthetic resin included in the sheath will be described. In the present invention, the sheath portion includes at least one of a polyester-based synthetic resin and a polyamide-based synthetic resin.

Specifically, the polyester-based synthetic resin of the sheath can be used without limitation as long as it is usually used for the C-type conjugated fiber, but preferably polyethylene terephthalate (PET), polytrimethylene terephthalate (PTT), polybutylene terephthalate PBT), and more preferably polyethylene terephthalate (PET). However, the present invention is not limited to the polyester synthetic resin described above, and polyester synthetic resin having added functionality may be used.

Next, the polyamide-based synthetic resin of the sheath may be any one selected from the group consisting of nylon 6, nylon 66, nylon 6.10 and aramid, And more preferably nylon 6. However, the present invention is not limited to the above-described polyamide-based synthetic resin, and a polyamide-based synthetic resin having added functionality may be used.

Next, the synthetic resin included in the core portion will be described.

The core portion is formed by condensation polymerization of an esterification reaction product comprising a terephthalic acid (TPA) -based acid component, a diol component containing ethylene glycol (EG) and dimethyl sulfoisophthalate sodium salt (DMSIP) and a polyalkylene glycol May be used.

In the case of using the polyester-based synthetic resin containing the copolymer, it is possible to prevent the reduction of the spinnability due to the frequent trimming and the increase of the pack pressure in the spinning process in the complex spinning, compared with the case of using other kinds of copolymers, There is an advantage that the problem of reduction in dye uniformity due to loss of unevenness in the core portion in the core portion elution step of the conjugate fiber can be advantageously avoided.

Specifically, an acid component containing terephthalic acid (TPA) in the core portion, a diol component including ethylene glycol (EG), and an esterification reaction product comprising dimethylsulfosuccinic acid sodium salt (DMSIP) and a polyalkylene glycol The polyester-based synthetic resin containing the polymerized copolymer can be produced through the following production process. However, the following production method is a preferred embodiment, but it is not limited thereto.

As a first step 1-1, an acid component containing terephthalic acid and a diol component containing ethylene glycol are contained in a molar ratio of 1: 1.1 to 2.0, and the total molar amount of the acid component containing terephthalic acid and the dimethylsulfuric acid isophthalate sodium salt And 0.1 to 3.0 mol% of dimethylsulfone isophthalate sodium salt to prepare an esterification reaction product.

The synthetic resin included in the core part of the present invention contains an acid component containing terephthalic acid (TPA), a diol component containing ethylene glycol (EG), and dimethyl sulfoisophthalate sodium salt as monomers.

Among the above monomers, acidic components containing terephthalic acid will first be described.

The present invention can include without limitation terephthalic acid (TPA) as an acid component, and acidic components used in conjugated fibers including conventional alkali-soluble polyesters in addition to terephthalic acid. Preferably, the acid component may contain terephthalic acid (TPA) in an amount of 50 mol% or more.

Specifically, the acidic component may additionally contain an aromatic polycarboxylic acid having 6 to 14 carbon atoms other than terephthalic acid, and as a non-limiting example, dimethyl terephthalic acid or isophthalic acid may be contained singly or in combination. However, dimethyl terephthalic acid requires additional catalysts due to its weaker esterification reactivity, and the cost of the raw material is about 20% higher than that of terephthalic acid. In the case of isophthalic acid, it may cause degradation of heat resistance of the produced copolyester, When a polycarboxylic acid is included, an appropriate amount is preferably mixed so as not to reduce the physical properties to be achieved by the present invention.

The acidic component may further include an aliphatic polycarboxylic acid having 2 to 14 carbon atoms, and examples thereof include oxalic acid, malonic acid, succinic acid, glutaric acid, adipic acid, suberic acid, It may be at least one selected from the group consisting of fumaric acid, azelaic acid, sebacic acid, nonanoic acid, decanoic acid, dodecanoic acid and hexanodecanoic acid. However, when the aliphatic polycarboxylic acid is included, the heat resistance of the produced copolyester may be lowered. In addition, when the aliphatic polycarboxylic acid is additionally contained, It is preferred that an appropriate amount be mixed.

Further, the acid component may include any one or more components selected from the group consisting of dicarboxylic acids and heterocyclic polycarboxylic acids including a heterocycle, and as a non-limiting example, 2,5-furan dicar 2,5-cydopenedicarboxylic acid, and 2,5-pyrrole dicarboxylic acid.

Next, the diol component containing ethylene glycol, which is another monomer, will be described.

In the case of a diol component which contains ethylene glycol (EG) as a diol component and ethylene glycol (EG) as the diol component and which is used in a conjugated fiber containing an alkali-soluble polyester in addition to ethylene glycol Without limitation. Preferably, the diol component may contain 50 mol% or more of ethylene glycol (EG).

Specifically, the diol component may further include an aliphatic diol component having 2 to 14 carbon atoms other than ethylene glycol. Specifically, the aliphatic diol component having 2 to 14 carbon atoms is selected from the group consisting of diethylene glycol, neopentyl glycol, 1,3-propanediol, 1,4-butanediol, 1,6-hexanediol, propylene glycol, trimethylglycol, tetramethylene glycol , One or more selected from the group consisting of pentamethyl glycol, hexamethylene glycol, heptamethylene glycol, octamethylene glycol, nonamethylene glycol, decamethylene glycol, undecamethylene glycol, dodecamethylene glycol and tridecamethylene glycol have. Preferably, it may be any one or more of diethylene glycol, neopentyl glycol, 1,3-propanediol, 1,4-butanediol, and 1,6-hexanediol. However, the diethylene glycol may induce an increase in yarn tension and pack pressure in the spinning process, and may cause defective dyeing unevenness due to loss of weight loss in the weight loss and dyeing process of the conjugate fiber. When the diethylene glycol is additionally added, It is preferable that an appropriate amount is mixed within a range that does not impair the physical properties to be obtained.

Next, another monomer, dimethylsulfur isophthalate sodium salt is described.

The present invention necessarily includes a sodium salt of dimethyl sulfoisophthalate which is a sulfonic acid metal salt, and the addition of dimethylsulfur isophthalate sodium salt has an advantage of inducing adsorption of water molecules and improving alkali utilization.

If a sulfonic acid metal salt other than the dimethylsulfuric acid isophthalate sodium salt is used as the sulfonic acid metal flame, there is a problem that improvement of the utilization of the alkali is slight.

The monomers, i.e., terephthalic acid, ethylene glycol, and dimethylsulfur isophthalate sodium salt, form an esterification reaction through an esterification reaction.

According to a preferred embodiment of the present invention, in the step 1-1), the esterification reaction product contains terephthalic acid and ethylene glycol in a molar ratio of 1: 1.1 to 2.0, and the total molar number of the terephthalic acid and the dimethylsulfuric isophthalate sodium salt 0.1 to 3.0 mol% of dimethylsulfur isophthalate sodium salt may be included.

First, terephthalic acid and ethylene glycol are contained in the reactant at a molar ratio of 1: 1.1 ~ 2.0, which is advantageous in maintaining high mechanical strength and shape stability during spinning for fiber production. If ethylene glycol is contained in an amount exceeding 2.0 molar ratio with respect to terephthalic acid, ethylene glycol may be converted into diethyl glycol, which may cause a large amount of diethylene glycol as a by-product. If it is contained in an amount less than 1.1 molar ratio, there may be a problem that the polymerization degree is lowered due to the lowered reactivity and the synthetic resin of the target high molecular weight core part can not be obtained.

Next, dimethylsulfur isophthalate sodium salt may contain 0.1 to 3.0 mol% of dimethylsulfur isophthalate sodium salt as compared to the total number of moles of acid components including terephthalic acid and dimethylsulfuric acid isophthalate sodium salt. If the sodium salt of dimethylsulfur isophthalate is contained in an amount of less than 0.1 mol% based on the total molar amount of the acid component including the terephthalic acid and the dimethylsulfuric acid isophthalate sodium salt, the alkali utilization characteristics are lowered, It is possible to cause alkaline infiltration of the fiber-forming polymer caused by the uneven dyeing process, and since the uniform elution can not be obtained, there may be a problem that the defect rate due to the uneven dyeing increases in the dyeing process of the fiber.

Also, if the sodium salt of dimethyl sulfoisophthalate is contained in excess of 3.0 mol% based on the total molar amount of terephthalic acid and dimethyl sulfoisophthalate sodium salt, the reaction stability is deteriorated and the amount of diethyleneglycol (DEG) Frequent occurrence of yarn and frequent occurrence of yarn are accompanied by an increase in packing pressure, resulting in deterioration of spinning operability, and alkali utilization characteristics are too high to obtain uniform utilization properties, resulting in uneven dyeing of the processed fiber and / There is a problem.

The mixing time of terephthalic acid, ethylene glycol and sodium 3,5-dicarbomethoxybenzenesulfonate for preparing the esterification reaction is not limited and may be added during the esterification reaction of terephthalic acid and ethylene glycol, May be added.

According to a preferred embodiment of the present invention, the esterification reaction product of the step 1-1) can be prepared under a metal acetate catalyst. The metal acetate catalyst may be selected from the group consisting of lithium acetate, manganese, cobalt, sodium, magnesium, zinc, and calcium.

The amount of the metal acetate catalyst is preferably 0.5 to 20 parts by weight based on 100 parts by weight of sodium 3,5-dicarbomethoxybenzenesulfonate as a metal acetate catalyst. If the amount of the metal acetate catalyst is less than 0.5 part by weight, the esterification reaction rate may be lowered and the reaction time may be increased. If the amount exceeds 20 parts by weight, the reaction of sodium 3,5- And it is difficult to control the content of diethylglycol as a by-product.

The esterification reaction in the above step 1-1) is preferably carried out at a temperature of 200 to 270 ° C. and a pressure of 1100 to 1350 Torr. If the above condition is not satisfied, the esterification reaction time may be prolonged or the side reaction product may form a large amount of diethylene glycol due to the influence of high temperature, and the esterification reaction product suitable for the polycondensation reaction can not be formed due to the lowered reactivity There may be a problem.

Next, a method for producing a copolymer through the condensation and polymerization of the esterification reaction product and the polyalkylene glycol will be described.

According to a preferred embodiment of the present invention, as the step 1-2), 7 to 14 parts by weight of polyalkylene glycol may be added to 100 parts by weight of the esterification reaction product.

First, the polyalkylene glycol will be described.

The molecular weight of the polyalkylene glycol may be 1,000 to 10,000. If the molecular weight is less than 1,000, the alkaline utilization rate may be lowered due to the decrease of the alkaline reducing process time and the alkaline infiltration of the fiber-forming polymer, And the defect rate due to non-uniform dyeing may increase in the dyeing process of the fiber. If the molecular weight exceeds 10,000, the polymerization reactivity is lowered, and the glass transition temperature of the copolyester formed is remarkably lowered, so that the thermal properties are lowered and the spinning may not be easy. The polyalkylene glycol may preferably be polyethylene glycol.

According to a preferred embodiment of the present invention, the polyalkylene glycol may be condensed to 7 to 14 parts by weight with respect to 100 parts by weight of the esterification reaction. If the amount of the polyalkylene glycol is less than 7 parts by weight There is a problem that the use of alkali is deteriorated. When the polyalkylene glycol is contained in an amount of more than 14 parts by weight, the polymerization degree is lowered and the glass transition temperature of the alkali-utilizing copolyester is remarkably lowered to lower the thermal property, It is too high to obtain a uniform utilization characteristic, resulting in uneven dyeing of the processed fiber and / or deterioration of mechanical strength.

The timing of introduction of the polyalkylene glycol is not limited, and may be introduced in the esterification reaction step of the esterification reaction product, or may be mixed with the reaction product in which the esterification reaction has been completed.

Preferably, the copolymer in the step 1-2) may be prepared at a temperature of 250 to 300 ° C and a pressure of 0.3 to 1.0 Torr. If the above conditions are not satisfied, the reaction time delay, polymerization degree, And the like.

The step 1-2) may further include a catalyst in the condensation / condensation reaction. The catalyst may be an antimony compound to ensure appropriate reactivity and lower the production cost, and a phosphorus compound to suppress color discoloration at a high temperature.

Examples of the antimony compound include antimony oxides such as antimony trioxide, antimony trioxide, and antimony pentoxide, antimony halides such as antimony trisulfide, antimony trifluoride, antimony trichloride, antimony triacetate, antimony benzoate, antimony tristearate, Can be used.

The amount of the antimony compound used as the catalyst is preferably 100 to 600 ppm based on the total weight of the polymer obtained after the polymerization.

As the phosphorus compound, phosphoric acid, trimethylphosphoric acid monomethylphosphoric acid, phosphoric acid such as tributylphosphoric acid, and derivatives thereof are preferably used. Of these, trimethylphosphoric acid, triethylphosphoric acid or triphenylphosphoric acid is particularly preferred, The amount of the phosphorus compound used is preferably 100 to 500 ppm based on the total weight of the polymer obtained after the polymerization.

The alkali-soluble copolyester produced by the above-described production process may have an intrinsic viscosity of preferably 0.6 to 1.0 dl / g, more preferably 0.850 to 1.000 dl / g, and the minor reactant diethylene And the glycol may be contained in an amount of 3.6 wt% or less.

If the intrinsic viscosity is less than 0.6 dl / g, there is a problem that the mechanical strength of the conjugate fiber is lowered in the spinning process, resulting in deterioration of disposability due to frequent occurrence of embroidery, and it is difficult to uniformly elute, There is a problem that alkali invasion of the polymer may be caused. When the intrinsic viscosity is higher than 1.00 dl / g, radiation workability is good due to high mechanical strength, but use of alkali is significantly lowered, resulting in problems such as an increase in the time required for the weight reduction process and uneven elution.

Further, diethyl glycol contained in the copolyester is a side reactant which is additionally generated in the reaction of terephthalic acid and ethylene glycol. There have been many attempts to reduce diethyl glycol, which is a side reaction, in the prior art. , It is difficult to control the rate of reduction in the alkali solution according to the byproducts, the lowering of the spinning workability and the defective in the dyeing process due to the non-uniformity of the dissolution, because the DEG content is 3.6 wt%, more preferably 3.3 wt% There is an advantage that it is possible to prevent the problem.

The synthetic resin of the core part according to the preferred embodiment of the present invention can be produced by using a tapered terephthalic acid (TPA) which is inexpensive in the polymerization process, while using a simple and economical dimethylsulfuric acid ester (SIGE) without using esterified sulfurized isophthalate glycol ester (DEG) and the generation of foreign substances by the ionic functional groups of dimethylsulfone isophthalate sodium salt (DMSIP) are minimized due to stable reactivity and excellent reaction rate even when using isophthalate sodium salt (DMSIP) It is possible to produce stable composite radiation without raising yarn and pack pressure during spinning and uniform elution during the elution process in an aqueous alkaline solution, so that the C type hollow fiber after the elution process and the final product using the same have a uniform and dense structure, Dyeability and soft touch can have excellent effects. Further, in the case of the composite fiber according to the preferred embodiment of the present invention, since the composite fiber has improved strength compared to the composite fiber including other conventional usable polymers, There is an advantage that the deformation can be minimized.

Next, in step (2), composite radiation is performed such that the core is exposed to the outside from one side of the sheath.

In the step (2), the weight ratio of the sheath portion and the core portion may be 70:30 to 35:65. If the content of the polyester-based synthetic resin or the polyamide-based synthetic resin contained in the sheath is more than 65% by weight, the strength of the composite fibers may deteriorate after elution of the composite fibers, , The cross-sectional area of the core portion is small, so that the effect of lightweight and heat insulation of the hollow fiber produced through the composite fiber may be deteriorated.

The ratio of the cross-sectional area (B) of the core portion to the total cross-sectional area (A) of the C-type conjugated fiber in the step (2)

[Relation 1]

Can be satisfied. Accordingly, the present invention can control and increase the cross-sectional area of the core portion (the hollow of the hollow fiber in the future) by adjusting the weight percentage of the core portion, and the C-type hollow fiber hollow- And can be adjusted and increased accordingly.

When the polyester synthetic resin is contained in the sheath portion, the polyester synthetic resin is 275 to 305 ° C. When the polyamide synthetic resin is contained in the sheath portion, the polyamide synthetic resin is melted at 235 to 275 ° C., It can be radiated.

Further, an esterification reaction product comprising an acid component containing terephthalic acid (TPA), a diol component containing ethylene glycol (EG) and dimethyl sulfo isophthalate sodium salt (DMSIP) to be contained in the core portion, The polyester-based synthetic resin containing a copolymer obtained by condensation polymerization of a phenol-formaldehyde condensate can be melted at a temperature of 255 to 290 ° C and can be compounded.

Since the composite fiber and the fiber-form coagulated fiber are not well oriented in the fiber, the composite conjugated C-type conjugated fiber can be preferably stretched or partially stretched.

Specifically, the method of spinning the C-type conjugated fiber with a drawn yarn (SDY) is a method of spinning the C-type conjugated fiber in a sheath of 1100 to 1700 mpm (m / min) And 4000 to 4600 mpm (m / min). When the sheath portion of the C-type conjugate fiber is a polyamide-based synthetic resin, the first winding is carried out at a speed of 1000 to 1400 mpm (m / min) and the second winding is carried out at a speed of 3800 to 4400 mpm (m / Can be stretched.

The method of spinning the C-type conjugate fiber with the partially drawn yarn (POY) is a method of spinning the C-type conjugate fiber in a sheath of 2500 to 3300 mpm (m / min) It can be partially stretched by a second winding which is wound at a speed of 2500 to 3400mpm (m / min). Further, in the case where the sheath portion of the C-type conjugate fiber is a polyamide-based synthetic resin, the first winding is carried out at a speed of 2300 to 2800 mpm (m / min) and the second winding is carried out at a speed of 2300 to 2900 mpm It can be partially stretched.

Preferably, the winding of the drawn yarn (SDY) and the partially drawn yarn (POY) at the time of spinning can spin the C type conjugated fiber using a Godet roller (G / R). In case of performing the first winding and the second winding using the godet roller in the step of manufacturing the drawn yarn (SDY), preferably the surface temperature of the godet roller is set to 70 to 90 DEG C in the first winding and 100 to 140 Lt; RTI ID = 0.0 > C, < / RTI > This makes it possible to prevent filing phenomenon that occurs during drawing.

The spinnable yarn or partially drawn yarn thus spun can be manufactured to have a fineness of 50 to 200 denier and 18 to 100 filaments, for ease of use and easiness of processing.

FIG. 1 is a schematic view of a C-type conjugate fiber included in a preferred embodiment of the present invention, and FIG. 2 is a schematic view showing a C-type hollow fiber according to a preferred embodiment of the present invention.

As shown in FIG. 1, the C-type conjugated fiber produced through the step (2) may include a sheath portion 100 including a polyester synthetic resin or a polyamide synthetic resin, and an acidic material containing terephthalic acid (TPA) , A polyester-based synthetic resin containing a diol component containing ethylene glycol (EG) and a copolymer obtained by polycondensation of an esterification reaction product containing dimethyl sulfoisophthalate sodium salt (DMSIP) with a polyalkylene glycol The core portion 100 includes a core portion 200 and a core portion 100. The core portion 100 is formed to have a C-shaped cross section in which the core portion 100 is wrapped around the core portion 100, And the composite radiation is formed in a shape exposed from one side to the outside.

At this time, when the core part 100 is exposed to one side of the sheath part 200, the core part may be easily eluted in the following core part eluting step, and when the core part is eluted to the outside, .

Preferably, the core part 100 may be deflected to a discontinuous side in the C-shaped cross-sectional shape of the sheath part 200, so that the dissolution of the core part can be made more smooth. However, in order to prevent the swelling phenomenon of the synthetic resin contained in the sheath portion, which may occur when the core portion is radially deflected to one side of the sheath portion, in order to prevent the swelling phenomenon of the synthetic resin contained in the sheath portion, Spinning can be used.

Next, according to one preferred embodiment of the present invention, after the step (2), post-treating the C-type conjugated fiber before the step (3) . ≪ / RTI >

The above-mentioned post-treatment can be used without limitation in the case of a post-treatment process suitable for use in a conventional C type hollow fiber producing process.

Preferably, the post-treatment may be performed by a method selected from the group consisting of DTY method, air jet method, and scratch method (knife edge method). The purpose of post-treatment as described above is to improve the stretchability and to increase the amount of the filament yarn to improve the disadvantages of the filament yarn.

Specifically, the method of post-treating the C-type conjugated fiber with a twisted yarn (DTY) includes spinning the C-type conjugated fiber into a drawn yarn (SDY) or partially drawn yarn (POY) , Twist counts of 3000 to 3600 占 (twist / m) and heat setting of 150 to 180 占 폚. In this case, in the case of the drawn yarn or the partially drawn yarn, 1 to 10 yarns are folded according to the use of the fabric to be subjected to a false twisting process. In case of the final false twist yarn, the fineness can be set to 30 to 1000 denier have.

The above-mentioned specific twisting method is only a post-processing method of a preferred embodiment according to the present invention. The post-processing method is not limited to the above-described description, and various kinds of yarns can be manufactured from various kinds of yarns. There will be.

Next, in step (3), the core part is eluted from the composite fiber to prepare a C-type hollow fiber.

In the case of the conventional composite fiber, the composite fiber has been frequently cut and deformed due to the low strength of the composite fiber in the manufacturing process of the composite fiber and / or the post-treatment process depending on the kind of the yarn to be manufactured.

In addition, in the case of a fabric using a conventional hollow fiber, there is a problem that the strength of the hollow fiber is so weak that the hollow fiber itself, from which the composite fiber has been eluted, can not be woven or knitted to produce a fabric. And after the knitting, the core portion of the composite fiber is eluted.

However, even in the conventional method as described above, there is a problem that the tearing phenomenon of the fabric can not be prevented due to the fact that the tear strength of the fabric eluted with the core portion is significantly lowered.

 Accordingly, the inventors of the present invention have solved the above problems by producing C-type conjugated fibers having a higher strength than conventional conjugated fibers.

Specifically, the C-type conjugated fiber included in the preferred embodiment of the present invention has an improved strength as compared with the conventional conjugated fiber (Table 4), and thus the C-type conjugated fiber is broken or deformed in the manufacturing process such as post- The core portion of the composite fiber can be minimized and the fabric can be manufactured by weaving or knitting it in the hollow fiber state.

Specifically, the C-type conjugated fiber included in the preferred embodiment of the present invention has an improved strength as compared with the conventional conjugated fiber (Table 4), and thus the C-type conjugated fiber is broken or deformed in the manufacturing process such as post- It can be seen that the core portion of the composite fiber can be minimized.

The core portion may be eluted through an alkaline solution. Preferably, 3-1) soft winding the composite fiber by 1 to 10 sorts of composite fibers in a yarn core tube; And 3-2) eluting the composite fibers wound on the quartz glass tube through an aqueous solution of sodium hydroxide at a pressure of 80 to 100 DEG C and 1 to 5 wt% of an aqueous sodium hydroxide solution.

In step 3-1), the core part may be eluted through the step 3-2) by laminating the conjugate fibers 1 to 10 in total, thereby controlling the number of filaments and the number of fineness required by the consumer during the fabrication of the fabric. There is an advantage that it is possible to cope with the demand of the consumer without shortening the manufacturing time and streamlining the manufacturing process and without additional additional process.

In the step 3-2), the core portion elution solution may preferably be a sodium hydroxide solution of 1 to 5%. If elution is performed in an aqueous solution of sodium hydroxide (NaOH) of less than 1%, elution time is prolonged, % Of sodium hydroxide (NaOH), the synthetic resin of at least one of the polyester-based synthetic resin and the polyamide-based synthetic resin contained in the sheath is subjected to alkali attack, resulting in defects in the C-type hollow fiber, There is a problem that workability is lowered in weaving, knitting, and the like.

In the sodium hydroxide (NaOH) aqueous solution in the step 3-2), the elution time may vary depending on the concentration of the aqueous sodium hydroxide solution, but may be preferably 10 to 120 minutes. Preferably, the elution temperature may be 80 to 100 ° C for normal pressure and 60 to 120 ° C for high pressure. If the elution temperature according to the pressure does not satisfy the above-mentioned range, there may be a problem of a decrease in the hollow ratio due to uneven dissolution and a deterioration of the quality of the fabric due to uneven dyeing.

On the other hand, according to a second embodiment of the present invention, there is provided a C-type hollow fiber comprising a C-shaped hollow including a slit having an open cross section, and a C-type hollow fiber satisfying all of the following conditions.

(1) 30 ≤ hollow ratio (%) ≤ 65

(2) 20 ° ≤ slit angle (θ) ≤ 30 °

(3)

(4)

Wherein the hollow ratio (%) is a percentage of the hollow cross-sectional area included in the hollow fiber with respect to the total cross-sectional area of the C-type hollow fiber, and the slit angle (?) Is a straight line connecting the center of the hollow and discontinuous points of the sheath (S) is the distance (μm) between the center of the hollow section at the center of the cross-section of the C-type hollow fiber, and the distance between the centers of the cross- R ₁ is the diameter (μm) of the entire cross-section of the C-type hollow fiber, and R ₂ is the diameter (μm) of the hollow cross-section of the C-type hollow fiber.

First, (1) 30 ≤ hollow ratio (%) ≤ 65 is satisfied.

If the hollow ratio is less than 30%, there is a problem that the hollow fiber has low heat retention and light weight, and thus the hollow fiber has a weak function. When the hollow ratio exceeds 65%, the strength of the hollow fiber decreases due to the thin structure of the sheath. There is a problem that the tear strength of the fabric to be woven through it is lowered and the final product tears easily.

Specifically, when the hollow ratio (%) is 70% (Table 7 and Comparative Example 6), the strength is 3.68 g / de and the hollow ratio (%) is 60% % Strength.

Next, (2) 20 DEG ≤ slit angle &thetas; 30 DEG is satisfied. 3 is a cross-sectional view illustrating a hollow fiber of a C-type hollow fiber according to a preferred embodiment of the present invention. As can be seen from FIG. 3D, it can be confirmed that the slit angle has a constant slope angle (? In FIG. 3D) regardless of the hollow ratio (%) of the hollow fiber.

The reason why the present invention can have a constant slit angle (?) Regardless of the hollow ratio (%) is that when the hollow ratio (%) of the hollow fiber of the C type hollow fiber according to the present invention is small, Shaped hollow fiber is deflected toward the open slit, but as the hollow ratio (%) increases, the center of the hollow section moves toward the center of the entire cross section of the hollow fiber.

If the slit angle? Is less than 20, the elution time of the core portion may be prolonged in the process of producing the C-type hollow fiber according to the preferred embodiment of the present invention, There may be a fatal problem in that the quality of the C-type hollow fiber is deteriorated due to the alkali invasion of the C-type hollow fiber sheath portion. In addition, if the hollow ratio (%) is greatly increased, the elution time of the core part may become longer. Further, there may be a residual core portion that is not eluted during the elution of the core portion, which may result in a decrease in hollowness, and the effect of lightweight, warmth, etc. of the hollow fiber may be deteriorated. Furthermore, defective dyeing may occur due to uneven elution, which may cause a problem of quality deterioration of the C-type hollow fiber.

Specifically, it can be seen that the elution time is longer when the slit angle is 17 ° (Table 7, Comparative Example 7) and when the slit angle is 25 ° (Table 4 Example 3).

If the angle of slit exceeds 30, the circular structure is lost and the air layer can not be effectively applied to the hollow, which may cause deterioration of the warming property, and the strength may be lowered. In addition, when the slit angle is changed according to the hollow ratio (%), the elution conditions are different, and thus there may be a problem of deterioration in workability in the post-treatment process.

를 만족한다. Next, (3)

.

Specifically, this means an interval corresponding to D in Fig. The C type hollow fiber of the present invention satisfies the above condition between the hollow ratio (%) and the slit spacing (d), and the slit spacing d increases as the hollow ratio (%) increases, .

When the C-type hollow fiber is produced, the elution time of the core portion in the elution process of the conjugate fiber may be uniform regardless of the hollow ratio, so that even when the hollow ratio (%) is large, (%) Is small and the core portion is more smoothly eluted, the C-type hollow fiber of the present invention can be a hollow fiber in which the infiltration by alkali is minimized.

If the above condition (3) is unsatisfactory, there is a problem that the production time in the elution process is prolonged, and the core part residue remains in the hollow part of the C-type hollow fiber, causing defective dyeing due to uneven elution, There is a problem that the quality may be deteriorated and hollow reduction due to the core portion residue that is not eluted may cause a decrease in the function of the hollow fiber. Further, there is a problem that the C-type hollow fiber may be a C-type hollow fiber whose quality is deteriorated due to the alkali attack due to the elongation of the elution process time.

을 만족한다. 상기 편심거리(s)는 C형 중공섬유 단면의 중심에서 중공 단면의 중심 간의 거리(μm)이고, R₁은 C형 중공섬유의 단면 전체의 직경(μm)이며, R₂는 C형 중공섬유 중 중공 단면의 직경(μm)을 의미한다. Next, (4)

. The eccentric distance (s) is a distance (μm), and, R ₁ is a diameter (μm) of the total of type C the hollow fiber cross-section between the center of the hollow cross section at the center of the form C a hollow fiber cross-section, R ₂ is a C-shaped hollow fiber (Μm) of the hollow hollow section.

If the above condition (4) is not satisfied, that is, in the case where the hollow position of the C type hollow fiber having the same hollow ratio (%) moves to the center of the C type hollow fiber cross section instead of the open slit side of the sheath There is a problem in that the elongation speed of the core part is lowered and / or the elution time is prolonged, so that the time of the manufacturing process is prolonged, defective dyeing occurs due to uneven elution, and the quality of the C-type hollow fiber is deteriorated due to alkali invasion .

Specifically, when the condition (4) is not satisfied (Table 7, Comparative Example 9), it is confirmed that the elution time is considerably larger than that in the case where the condition (4) is satisfied. In this case, the alkali infiltration of the C- There is a problem that the quality of the hollow fiber produced after elution may be deteriorated.

In the case of the C type hollow fiber according to the present invention, all of the above conditions (1) to (4) must be satisfied. If only one condition is satisfied, there is no destruction or deformation of the hollow of the present invention, It is difficult to minimize the dissolution failure and to exhibit the lightweight and warming function as the hollow fiber and maximize it.

Specifically, when any one of the conditions (1) to (4) is not satisfied, the strength of the C-type hollow fiber may be lowered and the hollow may not be fully retained. , Deterioration of quality due to alkaline infiltration of C type hollow fiber due to increase in elution time, poor dyeing due to uneven dissolution, and low heat retention due to hollow reduction and lightweight degradation may occur.

Meanwhile, the hollow fiber according to a preferred embodiment of the present invention

조건을 더 만족할 수 있다.(5)

Conditions can be satisfied more satisfactorily.

It is possible to have a uniform elution time regardless of the hollow ratio (%) in the elution step of the hollow fiber core portion if the condition (5) is satisfied other than the above-mentioned conditions (1) to (4) 4) condition, the elution time is reduced, so that the alkali infiltration of the C-type hollow fiber is minimized by reducing the production time of the hollow fiber, so that the C-type hollow fiber of excellent quality can be provided.

Specifically, in Examples 3 and 7 of Table 4 below satisfying the condition (5) of the present invention, it is confirmed that the elution time is less than Examples 9 and 10 of Table 5 below which do not satisfy the condition (5) of the present invention It is possible to shorten the elution time as compared with the case where the condition (5) is satisfied, and it can be understood that it is a C type hollow fiber of excellent quality with minimal alkali attack.

The C-type hollow fiber may preferably include at least one of a polyester-based resin and a polyamide-based synthetic resin, and a detailed description thereof is as described above in the production method.

The C-type hollow fiber is made of a partially drawn yarn (POY), a drawn yarn (SDY), a false twist yarn (DTY), an air textured yarn (ATY), an edge crimped yarn yarn and composite yarn (ITY). It may preferably be a drawn yarn (SDY), a false twist yarn (DTY) and a composite yarn (ITY).

The post-treated hollow fiber as described above is advantageous in that it can provide a C-type hollow fiber having improved effects such as improvement in stretchability and improvement in the amount of the hollow fiber.

 When the C-type hollow fiber is a partially drawn yarn (POY) or a drawn yarn (SDY), the fineness may be 50 to 200 deniers and 18 to 100 filaments for ease of use and processability.

When the C-type hollow fiber is a twisted yarn, the fineness may be 30 to 1000 deniers and 18 to 720 filaments for ease of use and processability.

However, the present invention is not limited to the above-described substrate, and it may be variously processed according to the type and purpose of the yarn to be produced, and the fineness and the number of filaments of the processed yarn may vary.

4 to 7 are cross-sectional views of a C-type hollow fiber according to a preferred embodiment of the present invention. As can be seen from the drawing, it is confirmed that the hollow fiber is a C-type hollow fiber which is not collapsed .

Hereinafter, the present invention will be described in more detail with reference to the following examples. However, the following examples should not be construed as limiting the scope of the present invention, and should be construed to facilitate understanding of the present invention.

≪ Example 1 >

First, to prepare the sheath, polyethylene terephthalate was melted at 290 ° C with a polyester-based synthetic resin to be included in the sheath. To prepare the core, terephthalic acid (TPA) and ethylene glycol (EG) were mixed at a molar ratio of 1: 1.2 and dimethylsulfuric isophthalate sodium (TPA) was added to the total molar amount of terephthalic acid (TPA) and dimethyl sulfoisophthalate sodium salt The salt was adjusted to 1.5 mol%. As a catalyst, 10.0 parts by weight of lithium acetate based on 100 parts by weight of dimethylsulfone isophthalate sodium salt (DMSIP) was mixed and esterified at 250 ° C under a pressure of 1140 Torr to obtain an ester reaction product, and the reaction rate was 97.5% . The resulting ester reactant was transferred to a condensation polymerization reactor and 10.0 parts by weight of polyethylene glycol (PEG) having a molecular weight of 6000 was added to 100 parts by weight of the ester reactant. Then, 400 ppm of antimony trioxide was added as a condensation polymerization catalyst so that the final pressure became 0.5 Torr The temperature was raised to 285 캜 while the pressure was gradually reduced to prepare a copolymer through condensation polymerization.

The copolymer obtained by condensation polymerization of an esterification reaction product of terephthalic acid (TPA), ethylene glycol (EG) and dimethyl sulfo isophthalate sodium salt (DMSIP) with polyethylene glycol was melted at 270 ° C., and the melted polyethylene tele Phthalate and the copolymer were combined and spinning at a weight ratio of 70:30, respectively, to prepare a drawn yarn (SDY) having a filament count of 36 and a fineness of 75 denier according to Table 1 under the conditions shown in Table 1 below. G / R in Table 1 below means godet roller.

Then, the softening yarn was soft-wound on a quartz tube and then eluted in a sodium hydroxide aqueous solution of 4 wt% at 95 ° C under atmospheric pressure to prepare a C-type hollow fiber.

Shape Radiation temperature (℃) G / R1 speed
(mpm, m / min) G / R1 Temperature (캜) G / R2 speed
(mpm, m / min) G / R2 temperature (캜) Kite company (SDY) 285 1500 90 4400 125

≪ Examples 2 to 4 >

(SDY) was prepared in the same manner as in Example 1 except that the weight ratio of sheath portion and core portion was 60:40, 50:50, and 40:60, respectively.

≪ Examples 5 to 8 >

(SDY) having a filament count of 36 and a fineness of 100 denier was produced in the same manner as in Examples 1 to 4.

≪ Example 9 >

C type hollow fiber according to Table 5 was prepared in the same manner as in Example 3 except that the eccentric distance in Table 4 was set at 1.5 mu m instead of 2.14 mu m.

≪ Example 10 >

C type hollow fibers according to Table 5 were prepared in the same manner as in Example 7 except that the eccentric distance in Table 4 was set to 1.5 占 퐉 instead of 2.47 占 퐉.

≪ Examples 11 to 14 >

Except that the weight reduction step was not carried out in an aqueous solution of sodium hydroxide and the same procedure as in Examples 1 to 4 was carried out except that in the condition of Table 2, (POY) was prepared.

Shape Radiation temperature (℃) G / R1 speed (mpm, m / min) G / R1 Temperature (캜) G / R2 speed (mpm, m / min) G / R2 temperature (캜) Partially stretched (POY) 285 2930 - 3030 -

≪ Examples 15 to 19 >

The partial stretched conjugated fibers (POY) prepared in the same manner as in Example 14 were subjected to the following tests: 1 ply, 2 ply, 4 ply, 6 ply, 8 ply, 500 m / min, 3300-3500 TM ) DT yarns were prepared by twisting the number of Z-twist yarns and thermally fixing conditions of 160 to 165 DEG C, and then softening the thus-prepared twisted composite fibers to a satin yarn tube. (DTY) according to Table 6 was prepared by dissolving it in the form of a yarn in a weight% aqueous sodium hydroxide solution.

≪ Example 20 >

Except that nylon 6 was melted at 250 캜 in place of polyethylene terephthalate in the sheath portion and nylon drawn hollow fiber (SDY) having a fineness of 75 denier 36 filament according to Table 6 under the conditions shown in Table 3 was melt- .

Shape Radiation temperature (℃) G / R1 speed (mpm, m / min) G / R1 Temperature (캜) G / R2 speed (mpm, m / min) G / R2 temperature (캜) Kite company (SDY) 275 1200 80 4000 120

≪ Comparative Examples 1 to 4 >

Except that the core part was treated with an esterification reaction product comprising terephthalic acid (TPA), ethylene glycol (EG), and dimethyl sulfoisophthalate sodium salt (DMSIP) and a polyalkylene glycol in the same manner as in Examples 1 to 4 Instead of the polyester-based synthetic resin containing the polymerized copolymer, Bellpure of KB SEIREN was melted at 275 DEG C to prepare C type hollow fibers through composite spinning.

≪ Comparative Examples 5 and 6 >

C type hollow fibers were prepared in the same manner as in Example 1 except that the weight ratio of sheath portion and core portion was changed to 73: 27 and 30: 70, respectively, instead of 70: 30.

≪ Comparative Examples 7 and 8 >

C type hollow fibers were prepared in the same manner as in Example 3 except that the slit angles were set to 17 ° and 37 °, respectively.

≪ Comparative Example 9 &

C type hollow fibers were prepared in the same manner as in Example 3 except that the eccentric distance (s) was set to 1.3 μm.

<Experimental Example 1>

Examples 1 to 8, Examples 11 to 20 and Comparative Examples 1 to 4, which were prepared so as to satisfy the following conditions (1) to (5), and Examples prepared so as to satisfy the following conditions (1) to (4) The following properties were measured for the C-type conjugated fibers and the C-type hollow fibers of Comparative Examples 5 to 9 prepared so as not to satisfy any one of the following conditions (1) to (4) Respectively.

1. Condition

(1) 30 ≤ hollow ratio (%) ≤ 65

(2) 20 ° ≤ slit angle (θ) ≤ 30 °

(3)

(4)

(5)

2. Strength and elongation

In the present invention, the strength and elongation were measured using an automatic tensile tester (Textechno) at a speed of 50 cm / min and a grip distance of 50 cm. Strength and elongation are the strength (g / de) divided by the denier (de) when the fiber is stretched until it is cut with a constant force, the strength, the percentage of the initial length as a percentage of the elongation, ) Were defined as extension.

Specifically, the following Tables 4 to 7 show examples of the esterification reaction comprising terephthalic acid (TPA), ethylene glycol (EG), and dimethyl sulfoisophthalate sodium salt (DMSIP) according to a preferred embodiment of the present invention and polyethylene glycol As compared with Comparative Examples 1 to 4 including Bellpure of KB SEIREN as a core part in the case of Examples 1 to 4 including a core-shell copolymer, the strength of the C-type conjugated fiber and the strength of the C- It can be confirmed that the elongation is very good.

3. Core part elution time

In the case of the elution time of the core portion in the present invention, the time for eluting the total amount of the core portion with respect to the weight of the core portion contained in the C-type conjugated fiber was measured by eluting the C-type conjugated fiber in an aqueous sodium hydroxide solution of 2 wt% .

Specifically, from Tables 4 to 7, it can be seen from Examples 1 to 8 that the elution time is uniform regardless of the sectional area ratio (%) of the core portion at the same fineness.

In Examples 3 and 7, which satisfy the condition (5) of the present invention, it is confirmed that the elution time is less than that of Examples 9 and 10 which do not satisfy the condition (5) of the present invention, It can be understood that the elution time can be shortened as compared with the case where it is not.

4. Core Elution (%)

In the case of the core-leaching property, the C-type conjugate fiber was eluted in an aqueous sodium hydroxide solution of 2% by weight at an atmospheric pressure of 100? For 18 minutes, and then the weight of the conjugated fiber before elution and the weight after elution were measured

Elution (%) =

Respectively. The higher the elution of the C type hollow fiber having the same hollow ratio, the higher the light weight and warmth, and the less the quality deterioration such as defective dyeing.

Specifically, in the case of Examples 1 to 4, elution with the above-mentioned conditions for 18 minutes in Examples 1 to 4 shows that all the eluate was eluted to 100%, which is related to the above elution time measurement experiment (%) Of the core portion is increased, the time required for elution of the entire amount is substantially the same as the case where the sectional area ratio (%) of the core portion is small. Therefore, the synthetic resin contained in the sheath portion of the composite fiber according to the present invention Alkaline invasion can be minimized. In addition, the C-type hollow fiber produced after elution according to the elution of all the components is excellent in light weight and warmth, and does not cause defective dyeing, so that the quality does not deteriorate.

5. Ease of radiation

In the present invention, the ease of spinning is a yield of the C-type conjugate fiber without cutting when the C type conjugate fiber (drawn yarn or partially drawn yarn)

로 계산되며

And

When the yield was 100 to 95%, it was divided into?, 95 to 90% was classified as?, And when the yield was less than 90%, x was classified.

Specifically, in the following Tables 4 to 7, it was found that in Comparative Examples, truncation occurred during the spinning in comparison with the Examples. In particular, Comparative Example 6 in which the hollow ratio (%) did not satisfy the condition (1) It can be seen that the spinnability is poor in Comparative Example 7 in which the slit angle does not satisfy the condition (2) of the present invention and Comparative Example 9 in which the slit angle does not satisfy the condition (4) of the present invention.

Claims (16)

(1) a resin composition containing at least one of a polyester-based resin and a polyamide-
Preparing a core portion containing a polyester-based synthetic resin containing a sheath portion and a polyester copolymer;
(2) composite radiation such that the core is exposed from one side of the sheath to the outside; And
(3) preparing a C-type hollow fiber by eluting a core portion from the composite fiber,
The polyester copolymer of the core part in the step (1)
1-1) A process for producing a polyester resin composition, which comprises an acid component containing terephthalic acid and a diol component comprising ethylene glycol in a molar ratio of 1: 1.1 to 2.0, wherein the total amount of the acid component containing terephthalic acid and the dimethyl sulfoisophthalate sodium salt 0.1 to 3.0 mol% of phthalate sodium salt to prepare an esterification reaction product; And
1-2) preparing a copolymer through condensation polymerization by mixing 7-14 parts by weight of polyalkylene glycol with 100 parts by weight of the esterification reaction product; Way. The method according to claim 1, further comprising, between steps (2) and (3)
Further comprising a step of post-treating the composite fiber. The method according to claim 1,
Wherein the polyester synthetic resin in the sheath of the step (1) is any one selected from the group consisting of polyethylene terephthalate (PET), polytrimethylene terephthalate (PTT) and polybutylene terephthalate (PBT) Method of manufacturing hollow fiber. The method according to claim 1,
Wherein the polyamide-based synthetic resin in the step (1) is any one selected from the group consisting of nylon 6, nylon 66, nylon 6.10, and aramid. delete The method according to claim 1,
Wherein the weight ratio of the sheath portion and the core portion in the step (2) is 70:30 to 35:65. 3. The method of claim 2,
Wherein the post-treatment is any one selected from the group consisting of a DTY method, an air jet method and a kneading method (knife edge method). The method according to claim 1,
Wherein the elution of the core portion in the step (3) is carried out through an alkali solution. 9. The method according to claim 8, wherein the elution of the core portion using the alkali solution
3-1) soft winding 1 to 10 composite fibers of the composite fibers in a yarn core tube; And
And 3-2) eluting the composite fibers wound on the quartz glass tube through an aqueous solution of sodium hydroxide at a pressure of 80 to 100 ° C and 1 to 5% by weight of sodium hydroxide. C type hollow fiber including a slit in which a cross section of the hollow fiber is opened; and a C type hollow fiber satisfying all of the following conditions
(1) 30 ≤ hollow ratio (%) ≤ 65
(2) 20 ° ≤ slit angle (θ) ≤ 30 °
(3)

(4)

Wherein the hollow ratio (%) is a percentage of the hollow cross-sectional area included in the hollow fiber with respect to the total cross-sectional area of the C-type hollow fiber, and the slit angle (?) Is a straight line connecting the center of the hollow and discontinuous points of the sheath (S) is the distance (μm) between the center of the hollow section at the center of the cross-section of the C-type hollow fiber, and the distance between the centers of the cross- R ₁ is the diameter (μm) of the entire cross-section of the C-type hollow fiber, and R ₂ is the diameter (μm) of the hollow cross-section of the C-type hollow fiber. 11. The method of claim 10,
And the C-type hollow fiber satisfies the following condition (5).
(5)

11. The method of claim 10,
Wherein the C-type hollow fiber includes at least one of a polyester-based synthetic resin and a polyamide-based synthetic resin. 11. The method of claim 10,
The C type hollow fibers are classified into a group consisting of partially drawn yarn (POY), drawn yarn (SDY), twisted yarn (DTY), air texture yarn (ATY), edge crimped yarn and composite yarn Type hollow fibers &lt; RTI ID = 0.0 &gt; 11. The method of claim 10,
Wherein the C type hollow fiber is a partially drawn yarn (POY) having a fineness of 50 to 200 denier and 18 to 100 filaments. 11. The method of claim 10,
Wherein the fineness of the C-type hollow fiber is 50 to 200 denier and the filament is 18 to 100 filaments when the C-type hollow fiber is a drawn yarn (SDY). 11. The method of claim 10,
Wherein the fineness of the C-type hollow fiber is between 50 and 1000 denier and between 18 and 720 filaments when the C-type hollow fiber is a DTY.

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