KR101487936B1 - Polyester complex fiber with C-shaped cross-section and method for manufacturing thereof - Google Patents

Abstract

The present invention relates to a polyester-based C-type composite fiber and a method for manufacturing the same. More specifically, when the composite fiber is manufactured by satisfying certain conditions of the present invention, the composite fiber has a cross-sectional area ratio of a core part which is more excellent than that of a prior composite fiber. Therefore, effects such as heat insulation property and lightness of a hollow fiber manufactured by using the composite fiber of the present invention are maximized. Also, the hollow fiber has excellent strength and an excellent elongation rate, and thus the composite fiber can be prevented from being deformed and destroyed, and can have enhanced flexibility. Moreover, a core part of the C-type composite fiber is smoothly dissolved in a uniform dissolution time regardless of a ratio of the core part in the composite fiber. Therefore, time for manufacturing the hollow fiber manufactured from the composite fiber is reduced; and quality of the hollow fiber can be excellent because the core part is completely dissolved.

Description

TECHNICAL FIELD [0001] The present invention relates to a polyester-based C-type conjugated fiber and a method for producing the same,

The present invention relates to a polyester-based C-type conjugated fiber and a method of producing the same. More particularly, the present invention relates to a polyester-type C-type conjugate fiber having a strength and elongation Ester type C-type conjugated fiber and a process for producing 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 imparting warmth to clothes 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 problems, a method using an elution type hollow fiber has been tried, and an elution type hollow fiber can be present without a hollow collapse because it is subjected to a post-treatment such as a tentative process and then a dissolution process before a dyeing 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 cistern portion is further lowered, and the tear strength of the fabric to be woven through the fiber decreases.

In addition, the cross-sectional area ratio of the core portion of the conventional conjugated fiber is 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 conjugated fiber having a core sectional area ratio of 30% or more even if it is attempted to produce a conjugated fiber having an improved core sectional area ratio in order to maximize warmth and light weight. In addition, when the cross-sectional area of the core portion is increased, the strength of the composite fibers and / or the hollow fibers produced therewith is further reduced. Furthermore, when the core area cross-sectional area ratio is increased, elution time in the elution process for producing hollow fibers is increased.

Furthermore, the strength and elongation of the composite fiber can be lowered when the cross-sectional area of the core portion is increased. In the conventional composite fiber, since the strength and elongation width of the conventional composite fiber are large, There is a problem in that it is difficult to produce a composite fiber having flexibility and flexibility.

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 hollow fiber is deformed or broken in the post-treatment process such as false twisting and 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.

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above-mentioned problems, and 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- Etc., and at the same time, it has excellent strength and does not cause deformation or fracture of the composite fiber in the manufacturing process, and has excellent elongation and improved flexibility, thereby providing a polyester-based C type composite fiber manufacturing method. It is another object of the present invention to provide a method for producing a polyester-based C-type conjugated fiber capable of increasing the elution rate even when the cross-sectional area ratio of the core part is increased in the elution step for producing hollow fibers in the future.

The second problem to be solved is that, in the case of the polyester-based C-type composite fiber satisfying the specific conditions of the present invention, the core portion is smoothly eluted in the weight reduction process for producing the hollow fibers, The elution time is shortened to shorten the production time of the hollow fiber and to elute the entire amount of the core part, thereby preventing the degradation of the hollow fiber. In addition, it is intended to provide a polyester-based C-type conjugated fiber having excellent strength and minimizing deformation and breakage of the conjugated fiber in the manufacturing process and having an excellent elongation and an excellent core sectional area ratio.

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 portion containing a polyester-based synthetic resin containing a diol component and a copolymer obtained by condensation polymerization of a polyalkylene glycol with an esterification reaction product comprising dimethylsulfoisophthalate sodium salt (DMSIP); And (2) composite radiation such that the core is exposed from one side of the sheath to the outside; Type C-type conjugated fiber.

According to a preferred embodiment of the present invention, after the step (2), the step (3) may include post-treating the C-type conjugated fiber to produce the C-shaped composite processed fiber.

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 unit of the step (1) comprises 1-1) mixing the dimethylsulfone isophthalate sodium salt (DMSIP) in an amount of 0.1 to 3.0 molar ratio relative to the total amount of the acid component and the diol component, Lt; / RTI > And 1-2) preparing a copolymer through condensation polymerization 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 of the step (3) may be performed by any one method selected from the group consisting of a DTY method, an air spraying method and a scratching method (knife edge method) .

According to a second aspect of the present invention, there is provided a method of manufacturing a semiconductor device including a core portion and a sheath portion surrounding the core portion, the cross section of which is C-shaped and the core portion is exposed to the outside from one side of the sheath portion, Thereby providing a polyester-based C-type conjugated fiber.

(1) 30 ≤ cross-sectional area of the core (%) ≤ 65

(2) 20 ° ≤ slit angle (θ) ≤ 30 °

(3)

(4)

(%) Is a percentage of the cross-sectional area of the core portion included in the composite fiber with respect to the total cross-sectional area of the C-type conjugate fiber, and the slit angle? Is a distance between the center of the core portion and discontinuous points of the sheath (S) is the distance (m) between the center of the core portion and the center of the cross section of the entire C-type conjugate fiber, ), R ₁ is the total cross-section diameter (μm) of the C-type conjugate fiber, and R ₂ is the diameter (μm) of the cross-section of the core portion of the C-type conjugate fiber.

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

(5)

According to another preferred embodiment of the present invention, the sheath may comprise at least one synthetic resin selected from the group consisting of a polyester series and a polyamide series. The core part may include an acidic component containing terephthalic acid (TPA), ethylene glycol (EG) And a polyester-based synthetic resin comprising a copolymer obtained by condensation polymerization of a polyalkylene glycol with an esterification reaction product containing a diol component and dimethylsulfoisophthalate sodium salt (DMSIP).

According to another preferred embodiment of the present invention, the C-type conjugated fiber is formed 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 conjugate fiber is a partially drawn yarn (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 are defined.

The term 'fiber' as used in the present invention means 'yarn' or 'yarn' and refers to various kinds of yarns and fibers which are common.

The term "core sectional area ratio" as used in the present invention means the percentage of the cross sectional area of the core portion with respect to the total cross-sectional area of the composite fiber.

The term 'eccentric distance' as used in the present invention means the distance between the center of the cross section of the core portion included in the cross section at the center of the cross section of the entirety of the C-type conjugate fiber.

The term 'composite fiber' as used in the present invention includes a yarn itself produced by composite spinning or a composite processed fiber which has been subjected to a process such as smearing.

The term "polyester-based C-type conjugated fiber" used in the present invention means a C-type conjugated fiber including a polyester-based synthetic resin as a core.

The polyester-based C-type conjugate fiber of the present invention and the method of producing the same have excellent cross-sectional area of the core portion compared to the conventional conjugate fiber, thereby maximizing the effects of the warmth and lightness of the hollow fiber produced in the future, And possesses excellent flexibility with virtually no deformation or breakage of the composite fibers in the manufacturing process, and has excellent flexibility.

Further, even if the cross-sectional area ratio of the core part is increased in the elution step for producing a hollow fiber in the future, the elution speed is increased to uniformize the time required for the elution step to shorten the manufacturing time, thereby preventing the alkali fiber from leaking out of the hollow fiber, It is possible to prevent quality deterioration due to problems such as defective dyeing and hollow reduction.

In addition, when the specific conditions of the present invention are all satisfied, the cross-sectional area of the core portion is improved as compared with the conventional conjugate fiber, and the core portion cross-sectional area ratio is increased with excellent strength and elongation. It is possible to simultaneously increase the elution rate and to produce a hollow fiber excellent in quality that does not cause defective dyeing, hollow reduction, and breakage of hollow fiber alkali due to shortening of manufacturing time and uneven elution.

1 is a schematic view of a polyester-based C-type conjugated fiber according to a preferred embodiment of the present invention.
FIG. 2 is a schematic view of a C-type hollow fiber which can be produced through a polyester-based C-type composite fiber according to a preferred embodiment of the present invention.
FIG. 3A is a cross-sectional view of a hollow fiber having a hollow 30% after the core portion of the polyester-based C-type conjugate fiber according to a preferred embodiment of the present invention is eluted.
FIG. 3B is a sectional view of a hollow fiber having a hollow ratio of 40% after the core portion of the polyester-based C-type conjugate fiber according to a preferred embodiment of the present invention is eluted.
3C is a cross-sectional view of a hollow fiber having a hollow ratio of 50% after the core portion of the polyester-based C-type conjugate fiber according to a preferred embodiment of the present invention is eluted.
FIG. 3D is a cross-sectional view of a hollow fiber having a hollow 60% after the core portion of the polyester-based C-type conjugate fiber according to a preferred embodiment of the present invention is eluted.

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

As described above, in the case of the conventional composite fiber, the tear strength of the final fabric after the composite spinning, the post-treatment, the weaving, and the salt manufacturing process is not ensured, and the tear of the fabric is frequently caused.

In addition, the cross-sectional area ratio of the core portion of the conventional conjugate fiber is less than 30%, which is insufficient in the warmth and lightness of the hollow fiber.

Further, even if it is attempted to maximize warmth and lightness, it is difficult to manufacture composite fibers having a core sectional area ratio of 30% or more. In case of increasing the cross-sectional area of the core, the composite fibers and / The strength is further lowered, and there is a problem that the after-treatment process such as false twisting of the yarn and the weaving process for making the fabric can not be further endured. In addition, there is a problem that elution time is prolonged because the elution rate of the core portion can not be improved independently of the increased cross-sectional area of the core portion in the elution process for producing hollow fibers in the future.

Furthermore, the strength and elongation of the composite fiber can be lowered when the cross-sectional area of the core portion is increased. In the conventional composite fiber, since the strength and elongation width of the conventional composite fiber are large, And it is difficult to produce a composite fiber having flexibility.

Thus, according to the first embodiment of the present invention, (1) an acid component containing terephthalic acid (TPA), a sheath containing at least one of polyester and polyamide, a diol containing ethylene glycol (EG) Preparing a core part containing a polyester-based synthetic resin containing a component and a copolymer obtained by polycondensation of an esterification reaction product containing dimethyl sulfoisophthalate sodium salt (DMSIP) and a polyalkylene glycol; And (2) coextruding the core part so that the core part is exposed to the outside from one side of the sheath, thereby solving the above-mentioned problem.

As a result, the cross sectional area ratio of the core portion can be greatly improved as compared with the cross sectional area ratio of the core portion of the conventional composite fiber, thereby maximizing the effects such as warmth and lightness of the hollow fiber produced thereby.

In addition, even if the cross-sectional area ratio of the core portion of the composite fiber is greatly improved, the C-type composite fiber is excellent in strength and has no elongation or breakage of the composite fiber in the manufacturing process. C type conjugated fiber can be produced.

Furthermore, even if the cross-sectional area ratio of the core portion is increased in the elution process for producing a hollow fiber in the future, the dissolution rate can be improved to make the elution process time uniform, thereby shortening the manufacturing time and preventing the alkali- By eluting the entire amount of the core portion, it is possible to prevent problems such as defective dyeing and hollow reduction.

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 portion 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) and 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. Preferably, an acid component containing terephthalic acid (TPA), a diol component containing ethylene glycol (EG), and a copolymer obtained by condensation polymerization of polyethylene glycol with an esterification reaction product containing dimethylsulfoisophthalate sodium salt (DMSIP) Lt; / RTI > 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.

Further, the copolymer preferably has an intrinsic viscosity [n] of 0.6 to 1.0. If the intrinsic viscosity is higher than 1.0, the spinning processability is good due to the high strength, but the elution of the core of the composite fiber is not easy, so that the desired composite fiber can not be produced. In addition, if the intrinsic viscosity is less than 0.6, there is a large deviation of the melt viscosity from the sheath polymer and the complex spinning workability is not easy, and the degree of polymerization is low so that the physical properties of the produced fiber are lowered.

An acid component containing terephthalic acid (TPA) in the core portion, a diol component containing ethylene glycol (EG) and a dimethylsulfoisophthalate sodium salt (DMSIP), and a polyalkylene glycol A polyester-based synthetic resin containing a copolymer can be produced through the following production process. However, the following production method is a preferred embodiment, but it is not limited thereto.

 First, in step 1-1), the dimethylsulfone isophthalate sodium salt (DMSIP) is mixed with the total amount of the acid component and the diol component at 0.1 to 3 molar ratio to prepare an esterification reaction product.

First, the acid component will be described.

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

Specifically, the acid component may include at least one component selected from the group consisting of an aromatic polycarboxylic acid component, a dicarboxylic acid component including a heterocycle, and an aliphatic polycarboxylic acid component.

The aromatic polycarboxylic acid component may be any one selected from the group consisting of terephthalic acid, isophthalic acid, and dimethyl terephthalic acid.

Also, the dicarboxylic acid component comprising the heterocycle is selected from the group consisting of 2,5-furan dicarboxylic acid, 2,5-ciphopenedicarboxylic acid and 2,5-pyrrole dicarboxylic acid It can be any one or more.

The aliphatic polycarboxylic acid component may be at least one selected from the group consisting of oxalic acid, malonic acid, succinic acid, glutaric acid, adipic acid, suberic acid, citric acid, pimelic acid, azelic acid, sebacic acid, nonanoic acid, decanoic acid, Canoic acid, and hexanoic decanoic acid.

Next, the diol component will be described.

The diol component includes ethylene glycol (EG), and may be included in a diol component used in a conjugated fiber including conventional alkali-soluble polyesters in addition to ethylene glycol, without limitation. Preferably, the diol component may contain 50 mol% or more of ethylene glycol (EG).

More specifically, the diol component may be an aliphatic diol component having 2 to 14 carbon atoms. More specifically, the diol component may be an aliphatic diol component having 2 to 14 carbon atoms, and more specifically, ethylene glycol, diethylene glycol, propylene glycol, trimethyl glycol, tetramethylene glycol, pentamethyl glycol, hexamethylene glycol, Recol, octamethylene glycol, nonamethylene glycol, decamethylene glycol, undecamethylene glycol, dodecamethylene glycol, and tridecamethylene glycol.

Preferably, the dimethylsulfone isophthalate sodium salt (DMSIP) may be mixed at a ratio of 0.1 to 3 mol based on the total amount of the acid component and the diol component.

If the dimethylsulfur isophthalate sodium salt (DMSIP) is mixed in an amount of less than 0.1 mol in the step 1-1), there may be a problem that the elution characteristics of the alkali are deteriorated and the desired conjugate fiber can not be prepared, (DEG), which is a minor reactant, and the alkali utilization characteristics are too high, so that uniform use characteristics can not be obtained.

The metal acetate catalyst may be added in an amount of 0.5 to 20.0 parts by weight based on 100 parts by weight of dimethylsulfone isophthalate sodium salt (DMSIP). If the metal acetate catalyst is used in an amount of less than 0.5 part by weight based on 100 parts by weight of dimethylsulfuric isophthalate sodium salt (DMSIP), the transesterification reaction rate decreases and the reaction time becomes longer. In addition, when the amount is more than 20.0 parts by weight, it is difficult to control the content of diethylene glycol (DEG) as a byproduct because reaction control of dimethylsulfur isophthalate sodium salt (DMSIP) is not performed.

 In the next step 1-2), 7 to 14 parts by weight of polyalkylene glycol is mixed with 100 parts by weight of the esterification reaction product to prepare a copolymer through condensation polymerization.

If the amount of the polyalkylene glycol is less than 7.0 parts by weight, the alkali utilization characteristics may deteriorate, and the desired conjugated fiber may not be produced. If the polyalkylene glycol is blended in excess of 14.0 parts by weight, , There may be a problem that the glass transition temperature of the formed polymer is too low and the thermal stability is poor.

Preferably, the polyalkylene glycol may be polyethylene glycol (PEG), and the polyethylene glycol (PEG) is preferably added to the polycondensation reaction step using a molecular weight of 1,000 to 10,000. When the molecular weight of the polyethylene glycol (PEG) according to one preferred embodiment of the present invention is less than 1,000, the alkali utilization characteristics deteriorate and the desired core part can not be obtained. When the molecular weight exceeds 10,000, the polymerization reactivity decreases, The temperature may be too low and the thermal stability may be poor.

As the catalyst used in the polycondensation reaction, an antimony compound can be used, and a phosphorus compound can be used to suppress color discoloration at a high temperature. Examples of the antimony compound include antimony oxides such as antimony trioxide, antimony tetraoxide, and antimony pentoxide, antimony halides such as antimony trisulfide, antimony trifluoride, and antimony trichloride, antimony triacetate, antimony benzoate, and antimony tristearate .

Antimony trioxide, antimony triacetate and the like show excellent effects and it is preferable to use them. The amount of the antimony triacetate to be used 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.

An esterification reaction product comprising an acid component comprising terephthalic acid (TPA), a diol component comprising ethylene glycol (EG) and dimethyl sulfo isophthalate sodium salt (DMSIP) in a core part according to a preferred embodiment of the present invention, The copolymers obtained by polycondensation of polyalkylene glycols can be produced by using terephthalic acid (TPA), which is inexpensive in the polymerization process, while using dimethyl sulphur isophthalate (TPA), which is simple and economical process without using esterified sulfurized isophthalate glycol ester The use of sodium salt (DMSIP) enables stable reaction and excellent reaction rate to minimize the generation of diethylene glycol (DEG) as a byproduct. In addition, the generation of foreign matter by the ionic functional group of the dimethylsulfur isophthalate sodium salt (DMSIP) is minimized, so that stable composite radiation is possible without increasing the yarn tension and packing pressure in the composite spinning. Furthermore, since the C-type hollow fiber after the elution step and the final product using the same can have a uniform and dense structure, the uniform dyeing property and the soft touch can have an excellent effect. Further, in the case of the composite fiber including the core portion according to the preferred embodiment of the present invention, the composite fiber having improved strength compared to the composite fiber including other conventional usable polymers, There is an advantage that the deformation of the hollow can be minimized in the process of FIG.

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 (core area cross-sectional area ratio) of the core portion by controlling the weight percentage of the core portion, and the C-type hollow fiber core hollow diameter, Adjustment and increase.

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.

Also, 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 in which an alkylene glycol is condensed is melted at 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 polyester-based C-type conjugate fiber according to a preferred embodiment of the present invention, and FIG. 2 is a schematic diagram showing a C-type hollow fiber produced in accordance with 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, since the core part 100 is exposed to one side of the sheath part 200, the core part can be easily eluted at the time of manufacturing the C type hollow fiber, and when the core part is eluted to the outside, Fibers can be produced.

Preferably, the core portion 100 may be deflected to a discontinuous side in the C-shaped cross-sectional shape of the sheath portion 200, and the core portion may be more smoothly discharged have. 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, after step (3), the produced C-type conjugated fiber is post-treated to produce C-shaped composite processed fiber. . ≪ / RTI >

In the case of the conventional composite fiber, the tearing of the fabric can not be prevented due to the deterioration of the tear strength of the core portion eluted through the processing of the salt processing and the weaving according to the composite fiber manufacturing process and / There was a problem. However, the inventors of the present invention have solved the above problems by making it possible to produce a C-type conjugated fiber having a higher strength than that of a conventional conjugated fiber.

Specifically, the C-type conjugated fiber has an improved strength as compared with the conventional conjugated fiber (Table 4), and it can be seen that the core portion of the conjugated fiber broken or deformed compared to the conventional conjugated fiber can be minimized.

Preferably, the post-treatment of step (3) may be carried out by any one of the following methods 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. However, the present invention is not limited to the above description, and it may be varied depending on the kind and purpose of the yarn to be produced, and may be used without limitation in the case of a post-treatment process which can be used for ordinary C-type conjugated fibers.

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.

According to a second aspect of the present invention, there is provided a method for manufacturing a core according to the second aspect of the present invention, comprising the steps of (1) to (4), wherein the core portion and the sheath portion surrounding the core portion are C- The present invention provides a polyester-based C-type conjugated fiber satisfying all of the above.

(1) 30 ≤ cross-sectional area of the core (%) ≤ 65

(2) 20 ° ≤ slit angle (θ) ≤ 30 °

(3)

(4)

(%) Is a percentage of the cross-sectional area of the core portion included in the composite fiber with respect to the total cross-sectional area of the C-type conjugate fiber, and the slit angle? Is a distance between the center of the core portion and discontinuous points of the sheath (S) is the distance (m) between the center of the core portion and the center of the cross section of the entire C-type conjugate fiber, R1 is the total cross-section of the cross-section of the C-type conjugate fiber (mu m), and R2 is the diameter (mu m) of the cross-section of the core portion of the C-type conjugate fiber.

First, (1) 30 ≤ the sectional area of the core part (%) ≤ 65 is satisfied.

The core sectional area ratio (%) represents the percentage of the cross-sectional area of the core portion included in the composite fiber with respect to the total cross-sectional area of the C-type composite fiber. If the cross-sectional area of the core portion is less than 30%, there is a problem that the hollow fibers to be manufactured through the composite fibers are insufficient in the warmth and lightness of the hollow fibers to exhibit their functions as hollow fibers. If the core cross- The strength of the composite fiber after the elution of the composite fiber is lowered due to the thin structure of the composite fiber, and the tear strength of the fabric to be woven through the composite fiber is lowered, thereby tearing the final product easily.

Specifically, in the case where the core portion area ratio (%) is 70% (Table 7, Comparative Example 6) and the core portion area ratio (%) is 60% (Table 4, Example 3) The strength of the test specimens was reduced by about 14%. Further, it can be confirmed that the radiation easiness is not good.

Next, (2) 20 DEG ≤ slit angle &thetas; 30 DEG is satisfied.

The slit angle? Means an angle between straight lines connecting the center of the core and discontinuous points of the sheath. Specifically, FIG. 3 is a cross-sectional view illustrating hollow fibers of the C-type hollow fiber after the core portion of the C-type conjugate fiber has been eluted according to a preferred embodiment of the present invention. As can be seen from FIGS. 3A to 3D, it can be confirmed that the fiber has a constant slit angle (? In FIG. 3D) regardless of the sectional area ratio (%) of the core portion of the conjugate fiber corresponding to the hollow fiber hollow ratio.

The reason why the present invention can have a constant slit angle (?) Regardless of the sectional area ratio (%) of the core part is that the C-type conjugate fiber according to the present invention has a core part The core is deflected toward the open slit of the C-type conjugated fiber, but the center of the core moves toward the center of the C-type conjugated fiber in the cross-section of the conjugated fiber as the cross-sectional area ratio (%) of the core increases.

If the slit angle? Is less than 20, the elongation time of the core portion may be prolonged in the process of producing the C-type hollow fiber through the C-type conjugate fiber of the present invention, There may be a problem that the quality of the C-type hollow fiber produced by inducing alkali invasion of the sheath is deteriorated. Further, if the cross-sectional area ratio (%) of the core portion is greatly increased, there may be a problem that the elution time of the core portion becomes 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, there may be a problem of quality deterioration due to occurrence of dyeing defects due to uneven dissolution.

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 slit angle? Is more than 30, the circular structure is lost and the air layer can not be effectively applied to the core portion, which may cause deterioration in thermal insulation and decrease strength. In addition, when the slit angle is changed according to the sectional area ratio (%) of the core part, the elution processing conditions are different, and thus there may be a problem of deterioration in workability in the post-treatment step.

Specifically, it can be confirmed that the strength was 2.21 g / de, which was 26% lower than the preferred embodiment (Table 4, Example 3) of the present invention, when the slit angle was 37 ° (Table 7 and Comparative Example 8).

를 만족한다. Next, (3)

.

The slit spacing d is the distance (μm) between both end points of the opened slit, and specifically refers to the interval corresponding to D in FIG. The C type conjugate fiber of the present invention satisfies the above condition between the sectional area ratio (%) of the core part and the slit spacing (d), and the slit spacing d also increases as the sectional area ratio (% Condition can be satisfied.

When the C-type hollow fiber is produced through the polyester-based C-type conjugated fiber according to the present invention, the elution time of the core portion may be uniform regardless of the content of the core portion, (%) Is large, the core portion can be eluted more smoothly as in the case where the sectional area ratio (%) of the core portion is small.

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 produced through the conjugate fiber, There is a problem that the quality of the hollow fiber may be deteriorated, and the decrease of hollow due to the non-eluted core residue may lead to a decrease in the function of the hollow fiber. Further, in order to elute the entire amount of the core part residue, the elution time must be prolonged. In this case, there is a fatal problem that the cis-component of the C-type conjugate fiber may be infiltrated with alkali to cause deterioration in quality.

을 만족한다. Next, (4)

.

The eccentric distance is a distance (μm) between the C-type composite fiber cross-section core part center across the center of, R ₁ is a diameter (μm) of the total of the composite fiber-C cross-section, R ₂ is a C-type conjugate fiber of the core cross-section (M).

If the above condition (4) is not satisfied, that is, the position of the core portion in the C-type conjugate fiber having the same core sectional area ratio (%) moves to the center of the cross-section of the C- The elution rate of the core portion may be lowered and / or the elution time may be prolonged, so that there is a problem that the time of the manufacturing process is prolonged and the quality of the core portion is deteriorated due to alkali invasion.

Specifically, when the condition (4) is not satisfied (Table 7 and Comparative Example 9), it can be confirmed that the dissolution time is considerably larger than the case where the condition (4) is satisfied. In this case, So that the quality of the hollow fiber produced after elution can be deteriorated.

In the case of the C-type conjugate fiber according to the present invention, all of the above conditions (1) to (4) must be satisfied, and if only one condition is not satisfied, the desired elution property of the present invention and shortening of the elution time, It is difficult to achieve minimization of dyeing defects through prevention of infiltration and smooth dissolution, light weight by minimizing the dissolution failure, and maintenance of the warming function.

Specifically, when the condition of any one of the conditions (1) to (4) is not satisfied, the use time is reduced and the production time is increased in the process of producing the hollow fiber through the C-type conjugate fiber, Defective dyeing due to unevenness, heat retention due to hollow reduction, lowering of lightweight, and the like may occur.

On the other hand, the conjugate fiber of the present invention

조건을 더 만족할 수 있다.(5)

Conditions can be satisfied more satisfactorily.

It is possible to obtain a uniform elution time regardless of the sectional area ratio (%) of the core portion in the elution step of the composite fiber core portion, The elution time is reduced as compared with the case of satisfying the conditions (4) to (4), which is advantageous in terms of prevention of quality deterioration through reduction of hollow fiber production time and minimization of alkali invasion of the sheath.

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 And the elution time can be shortened when the condition (5) is satisfied.

The sheath preferably comprises a synthetic resin selected from the group consisting of a polyester series and a polyamide series. The core portion preferably includes an acid component containing terephthalic acid (TPA), a diol component including ethylene glycol (EG) A polyester-based synthetic resin containing a copolymer obtained by condensation polymerization of a polyalkylene glycol with an esterification reaction product containing dimethylsulfoisophthalate sodium salt (DMSIP) may be included. A detailed description thereof is as described above in the above production method.

The C-type conjugated fiber is composed 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). When the C-type conjugate 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 conjugate fiber is a twisted yarn, the fineness may be 30 to 1000 deniers and 18 to 720 filaments for ease of use and ease of processing.

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.

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. (TPA) as an acid component and ethylene glycol (EG) compound as a diol component were mixed at a ratio of 1: 1.2, and dimethylsulfone isophthalate sodium salt (DMSIP) was added to the total amount of terephthalic acid and ethylene glycol. Were mixed at a molar ratio of 1.5 to prepare an esterification reaction product. The esterification reaction was carried out by mixing 10.0 parts by weight of lithium acetate as a metal acetate catalyst based on 100 parts by weight of dimethylsulfone isophthalate sodium salt (DMSIP), and esterifying the mixture at 250 ° C under a pressure of 1140 Torr to obtain an ester reactant. 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 copolymer was polymerized through condensation polymerization by gradually increasing the temperature to 285 DEG C under reduced pressure.

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 terephthalate The phthalate and the copolymer were spinning together at a weight ratio of 70:30 according to the following Table 4 to prepare a drawn yarn (SDY) having a filament count of 36 and a fineness of 75 denier under the drawing conditions shown in Table 1 below. G / R in Table 1 below means godet roller.

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 by conducting the same processes as in Example 1, and using a weight ratio of sheath portion and core portion of 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 >

The polyester-based C-type conjugated fibers according to Table 5 were prepared in the same manner as in Example 3 except that the eccentric distance in Table 4 was set to 1.5 μm instead of 2.14 μm.

≪ Example 10 >

The polyester-based C-type conjugated fiber according to Table 5 was prepared in the same manner as in Example 7 except that the eccentric distance in Table 4 was set to 1.5 μm instead of 2.47 μm.

≪ Examples 11 to 14 >

A partially stretched yarn having a fineness of 123 denier and a filament of 36 filaments according to Table 5 was produced under the partial stretching conditions shown in Table 2 at the weight ratio of the same sheath portion and core portion as in Examples 1 to 4.

Shape Radiation temperature
(° C) 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 >

(POY) manufactured in the same manner as in Example 16 was subjected to a number of twists of 1, 2, 4, 6, 8, 500 m / min, 3300 to 3500 TM (twist / m) (DTY) having a fineness of 75 denier and a filament of 36 filaments as shown in Table 6 under heat setting conditions of 160 to 165 ° C.

≪ Example 20 >

Nylon 6 was melted at 250 캜 in place of polyethylene terephthalate in the sheath portion at the same weight ratio of sheath portion and core portion as in Example 3, and nylon drawn yarn having a fineness of 75 denier 36 filament according to Table 6 was produced under the conditions shown in Table 3 below Respectively.

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 >

The core parts were prepared by conducting the same processes as in Examples 11 to 14 except that the esterification reaction product containing terephthalic acid (TPA), ethylene glycol (EG) and dimethyl sulfoisophthalate sodium salt (DMSIP) and polyalkylene glycol Instead of the polyester synthetic resin containing the polymerized copolymer, Bellpure manufactured by KB SEIREN was melted at 275 캜 and polyester-based C-type conjugated fiber was produced by composite spinning under the conditions shown in Table 7.

≪ Comparative Examples 5 and 6 >

Polyester-based C-type conjugated 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 >

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

≪ Comparative Example 9 &

Polyester-based C-type conjugated 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 on the polyester-based C-type conjugated fibers of Comparative Examples 5 to 9 prepared so as not to satisfy any one of the following conditions (1) to (4) and shown in Tables 4 to 7 .

1. Condition

(1) 30 ≤ cross-sectional area of the core (%) ≤ 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 It can be confirmed that the strength and elongation of Examples 11 to 14 including the core-co-polymerized copolymer are superior to those of Comparative Examples 1 to 4 comprising Bellpure of KB SEIREN as a core part.

3. Core part elution time

In the case of the elution time of the core portion in the present invention, the time at which the total amount of the core portion eluted was measured relative to the weight of the core portion contained in the C-type conjugated fiber by eluting the C-type conjugated fiber at an atmospheric pressure of 100 캜 in an aqueous sodium hydroxide solution of 2% .

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 present invention, the C-type conjugate fiber was eluted in an aqueous solution of 2% by weight of sodium hydroxide at an atmospheric pressure of 100 ° C for 18 minutes in the case of the core part elution (%), and then the weight of the conjugated composite fiber and the weight after elution

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?, When it was 95 to 90%, it was classified as?, And when it was less than 90%, it was classified as x.

Specifically, in the following Tables 4 to 7, it is seen that in the comparative example, the truncation occurs frequently during the spinning compared to the embodiment. In particular, in the comparative example in which the cross sectional area ratio (%) of the core part does not satisfy the condition (1) 6, the comparative example 7 in which the slit angle does not satisfy the condition (2) of the present invention, and the comparative example 9 in which the slit angle does not satisfy the condition (4) of the present invention is poor in radiating easiness.

100: sheath portion, 200: core portion

Claims (14)

delete delete delete delete delete delete delete And a core portion and a sheath portion surrounding the core portion, wherein the cross-section is C-shaped, the core portion is exposed to the outside from one side of the sheath portion, and the polyester-based C-

(1) 30 ≤ cross-sectional area of the core (%) ≤ 65
(2) 20 ° ≤ slit angle (θ) ≤ 30 °
(3)

(4)

(%) Is a percentage of the cross-sectional area of the core portion included in the composite fiber with respect to the total cross-sectional area of the C-type conjugate fiber, and the slit angle? Is a distance between the center of the core portion and discontinuous points of the sheath (S) is the distance between the center of the entirety of the cross section of the C-type conjugate fiber (μm) and the distance between the centers of the core portions ), R ₁ is the diameter (μm) of the entire cross-section of the C-type conjugate fiber, and R ₂ is the diameter (μm) of the cross-section of the core portion of the C-type conjugate fiber. 9. The method of claim 8,
Wherein the C-type conjugated fiber satisfies the following condition (5).
(5)

9. The method of claim 8,
Wherein the sheath portion comprises at least one of a polyester-based resin and a polyamide-based synthetic resin, and the core portion comprises an acid component containing terephthalic acid (TPA), a diol component containing ethylene glycol (EG), and a dimethyl sulfoisophthalate sodium A polyester-based C-type conjugated fiber comprising a polyester-based synthetic resin comprising a copolymer obtained by polycondensation of an esterification reaction product containing a salt (DMSIP) and a polyalkylene glycol. 9. The method of claim 8,
The C-type conjugated fibers are classified into a group consisting of a partially drawn yarn (POY), a drawn yarn (SDY), a false twist yarn (DTY), an air textured yarn (ATY), an edge crimped yarn and a composite yarn And the polyester type C-type conjugated fiber is one selected from the group consisting of polyester, 9. The method of claim 8,
Wherein the C-type conjugate fiber is partially drawn (POY) and has a fineness of 50 to 200 denier and 18 to 100 filaments. 9. The method of claim 8,
Wherein the C-type conjugated fiber is a drawn yarn (SDY), the fineness is 50 to 200 denier, and the filament is 18 to 100 filaments. 9. The method of claim 8,
And the fineness of the C-type conjugated fiber is from 50 to 1000 denier and from 18 to 720 filaments when the C-type conjugated fiber is a false-twisted yarn.

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