KR102073484B1 - Polyester complexfiber with highly elasticity and method for manufacturing thereof - Google Patents

Abstract

The present invention relates to a polyester composite fiber having excellent elasticity and a method for manufacturing the same, and more particularly to a polyester composite fiber having excellent elasticity as well as excellent elasticity and a manufacturing method thereof.

Description

Polyester composite fiber with excellent elasticity and method for manufacturing thereof

The present invention relates to a polyester composite fiber having excellent elasticity and a method for manufacturing the same, and more particularly to a polyester composite fiber having excellent elasticity as well as excellent elasticity and a manufacturing method thereof.

Stretch or elastic properties are very important and indispensable in all areas of clothing and industry. In the past, spandex (polyurethane urea fiber) was mainly used as an elastic fiber, and it could be used for various purposes because of the high elastic property of spandex. In the field of clothing, in particular, it has been used in combination with various materials such as polyamides, polyesters or cotton fibers.

However, unlike the excellent elastic properties of spandex, there are various limitations in using. Particularly, tension and unevenness in the process of weaving and weaving cause severe dyeing and fabric streaks during dyeing and weaving, or curling occurs depending on the design of the product, and spandex is separated from the fabric. And yellowing phenomenon occurs during use.

In this regard, Korean Patent No. 10-1272615 has prepared a highly elastic blend fiber by mixing polyester elastomeric monofilament and polytetramethylene terephthalate monofilaments in a mold during melt spinning, but polyester elastomer monofilament There is a problem that the dye fastness when dyeing using a disperse dye can be very poor.

In addition, the Republic of Korea Patent No. 10-1453649 is a spandex in which a low melting point thermoplastic elastomer is mixed with a polyurethane urea polymer to solve the problem that the curling occurs in the product in the cutting and sewing process or the elasticity of the spandex is separated from where it is loosened on the edge The product has been manufactured. The low melting point thermoplastic elastomer is thermally fused to prevent curling and curling, but there is a problem that the discoloration phenomenon and yellowing phenomenon of the spandex product cannot be greatly improved. .

The present invention has been made to solve the above problems, the composite spinning of a polyester-based elastomer prepared by copolymerizing a specific monomer and a polyester compound prepared by copolymerizing a specific monomer, the dissipation and curling phenomenon such as spandex It is an object of the present invention to provide a polyester composite fiber having excellent elasticity and excellent elasticity at the same time having excellent dyeability and a manufacturing method thereof.

In order to solve the above problems, the polyester composite fiber excellent in elasticity of the present invention is a polyester composite fiber produced by complex spinning the first component and the second component, the first component is a terephthalic acid monomer, isophthalic acid monomer, To include a polyester-based elastomer prepared by copolymerizing a monomer represented by the formula (1) and an ethylene glycol monomer, the second component comprises a polyester compound prepared by copolymerizing an acid component and a glycol component, the acid component is It includes a terephthalic acid monomer and a monomer represented by the following formula (2), the glycol component may comprise an ethylene glycol monomer.

[Formula 1]

In Chemical Formula 1, A is -CH ₂ CH ₂ CH _2- , -CH ₂ CH ₂ CH ₂ CH _2- , -CH ₂ CH ₂ CH ₂ CH ₂ CH _2- , -CH ₂ CH ₂ CH ₂ CH ₂ CH ₂ CH ₂ -or -CH ₂ CH ₂ CH ₂ CH ₂ CH ₂ CH ₂ CH _2- , n is a rational number satisfying the weight average molecular weight (Mw) 500 ~ 5,000 of the monomer,

[Formula 2]

In Formula 2, M is Li, Na, K, Rb or Cs.

In a preferred embodiment of the present invention, the first component is 5 to 25 mol% isophthalic acid monomer, 3 to 15 mol% of the monomer represented by the formula (1) relative to the total mol% of the first component, the ethylene glycol monomer 5 to 20 mole% and the balance of terephthalic acid monomers.

In a preferred embodiment of the present invention, the acid component of the second component may include 1 to 5 mol% of the monomer represented by Formula 2 and the remaining amount of terephthalic acid monomer relative to the total mole percent of the acid component.

In a preferred embodiment of the present invention, the weight ratio of the first component and the second component may be 1: 0.8 to 1.2.

In a preferred embodiment of the present invention, the first component may have a melting temperature (Tm) of 130 to 220 ° C., a melting index (MI) of 7 to 21, and a hardness of 20 to 50 measured by a Shore hardness meter Shore D. have.

In a preferred embodiment of the present invention, the second component may be a melting temperature (Tm) of 200 ~ 250 ℃, intrinsic viscosity (I.V) of 0.45 ~ 0.68 dl / g.

In a preferred embodiment of the present invention, the cross-sectional shape of the composite fiber may be a peanut side-by-side or a circular side-by-side.

In a preferred embodiment of the present invention, the composite fiber may have a fineness of 20 to 180 denier, the filament number of 12 to 96.

In a preferred embodiment of the present invention, the composite fiber may have a stretch (%) of 5 to 25% measured by the following equation (1).

Equation 1

In Equation 1, the elasticity is applied to the composite fiber 20.5g load, left for 10 minutes to measure the initial length, in a state of applying 20.5g load 10 minutes in hot water at 82 ℃ 3 to 5 After drying for a minute, the later length is measured.

On the other hand, a method for producing a polyester composite fiber excellent in elasticity of the present invention is a terephthalic acid monomer, isophthalic acid monomer, a monomer represented by the following formula (1) and a ethylene glycol monomer prepared by copolymerizing a first component comprising a polyester-based elastomer A first step of melting, a second step of melting a second component comprising a polyester compound prepared by copolymerizing a terephthalic acid monomer, a monomer represented by Formula 2 and an ethylene glycol monomer, and the molten first component and the second It may comprise a third step of producing a polyester composite fiber by complex spinning the components.

[Formula 1]

In Chemical Formula 1, A is -CH ₂ CH ₂ CH _2- , -CH ₂ CH ₂ CH ₂ CH _2- , -CH ₂ CH ₂ CH ₂ CH ₂ CH _2- , -CH ₂ CH ₂ CH ₂ CH ₂ CH ₂ CH ₂ -or -CH ₂ CH ₂ CH ₂ CH ₂ CH ₂ CH ₂ CH _2- , n is a rational number satisfying the weight average molecular weight (Mw) 500 ~ 5,000 of the monomer,

[Formula 2]

In Formula 2, M is Li, Na, K, Rb or Cs.

In a preferred embodiment of the present invention, the composite spinning may be carried out at a temperature of 230 ~ 300 ℃ and a flux of 3000 ~ 5000 mpm.

In a preferred embodiment of the present invention, the stretching process of the polyester composite fiber prepared by the composite spinning in the third step at a stretching temperature of 40 ~ 110 ℃, heat treatment temperature of 80 ~ 140 ℃ and a stretching ratio of 1.5 ~ 4.0 Can carry out

Furthermore, the mixed fiber of the present invention includes the polyester composite fiber excellent in the aforementioned elasticity.

In addition, the fabric of the present invention includes the polyester composite fiber excellent in the aforementioned elasticity.

Hereinafter, the term used by this invention is demonstrated.

In the present invention, the term 'fiber' as used means 'yarn' or 'thread', and means various kinds of yarns and fibers in general.

The term 'composite fiber' used in the present invention is used in the sense of including the yarn itself, or a stretched and / or partially stretched coarse fiber produced by the composite spinning.

“Heat treatment temperature” used in the present invention refers to the surface temperature of a high temperature roller which is commonly used in the stretching process.

The polyester composite fiber excellent in elasticity of the present invention not only has excellent dyeing property and elasticity, but may also have a rubbery feel without a separate coating process after weaving the knitting.

In addition, the manufacturing method of the polyester composite fiber excellent in elasticity of the present invention can be manufactured by the melt spinning method without using a solvent, unlike the manufacturing method of spandex can reduce the product cost.

1 is a schematic diagram of a side-by-side composite fiber having a peanut-shaped cross-sectional shape according to a preferred embodiment of the present invention.
Figure 2 is a SEM photograph of the side-by-side composite fiber having a peanut-shaped cross-sectional shape according to a preferred embodiment of the present invention.
Figure 3 is a schematic diagram of the side-by-side composite fiber having a circular cross-sectional shape according to an embodiment of the present invention.
Figure 4 is a SEM image of the side-by-side composite fiber having a circular cross-sectional shape according to a preferred embodiment of the present invention.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. As those skilled in the art would realize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention. The drawings and description are to be regarded as illustrative in nature and not restrictive. Like reference numerals designate like elements throughout the specification.

The polyester composite fiber excellent in elasticity of the present invention is manufactured by composite spinning the first component and the second component.

First, the first component of the polyester composite fiber excellent in elasticity of the present invention may include a polyester-based elastomer prepared by copolymerizing a terephthalic acid monomer, an isophthalic acid monomer, a monomer represented by the following formula (1) and an ethylene glycol monomer.

[Formula 1]

In Chemical Formula 1, A is -CH ₂ CH ₂ CH _2- , -CH ₂ CH ₂ CH ₂ CH _2- , -CH ₂ CH ₂ CH ₂ CH ₂ CH _2- , -CH ₂ CH ₂ CH ₂ CH ₂ CH ₂ CH ₂ -or -CH ₂ CH ₂ CH ₂ CH ₂ CH ₂ CH ₂ CH _2- , preferably -CH ₂ CH ₂ CH _2- , -CH ₂ CH ₂ CH ₂ CH ₂ -or -CH ₂ CH ₂ CH ₂ CH ₂ CH _2- .

In addition, in Chemical Formula 1, n is a ratio of 500 to 5,000, preferably 800 to 3,000, of the weight average molecular weight (Mw) of the monomer.

Specifically, the first component of the present invention may include 5 to 25 mol%, preferably 20 to 24 mol% of isophthalic acid monomer, based on 5 mol% of isophthalic acid monomer, based on the total mol% of the first component. Including less than% may be a problem of heat sealability, if containing more than 25 mol% there may be a problem of spinning workability.

In addition, the first component of the present invention may include 3 to 15 mol%, preferably 5 to 9 mol% of the monomer represented by Formula 1 with respect to the total mol% of the first component, and, if If the monomer represented by less than 3 mol% may have a problem of elastic properties, if it contains more than 15 mol% there may be a problem of spinning workability.

In addition, the first component of the present invention may include 5 to 20 mol%, preferably 10 to 14 mol% of the ethylene glycol monomer with respect to the total mol% of the first component, and, if the ethylene glycol monomer is 5 mol If it contains less than%, there may be a problem of poor workability due to lack of crystallinity in the solidification and stretching process during spinning, and if it contains more than 20 mol%, there may be a problem that the elastic properties are reduced due to the loss of the properties of the elastomer .

In addition, the first component of the present invention may include a residual amount of terephthalic acid monomer, except for the mole% of the isophthalic acid monomer, the monomer represented by Formula 1, and the ethylene glycol monomer relative to the total mole% of the first component.

On the other hand, the first component of the present invention may have a melting temperature (Tm) of 130 ~ 220 ℃, preferably 140 ~ 180 ℃, if the melting temperature is less than 130 ℃ may have a problem of solidification during spinning, 220 When it exceeds C, there may be a problem of deterioration of the thermal fusion function.

In addition, the first component of the present invention may have a melt index (MI) of 7 to 21, preferably 9 to 13, and if the melt index is less than 7, the melt flow of the polymer is slow and the problem of the formation of curvature in the form of detention Conversely, if it exceeds 21, the polymer melt flow may be too fast and likewise there may be a problem of starvation in detention.

In addition, the first component of the present invention may have a hardness of 20 to 50, preferably 25 to 35, measured by the Shore hardness meter Shore D. If the hardness is less than 20, the rubber texture is too high after the preparation of the composite fiber of the present invention. There may be a strong problem, and if it exceeds 50, there may be a problem that the touch of the composite fiber of the present invention becomes hard.

Next, the second component of the polyester composite fiber excellent in elasticity of the present invention may include a polyester compound prepared by copolymerizing an acid component and a glycol component.

In this case, the acid component may include a terephthalic acid monomer and a monomer represented by Formula 2 below, and the glycol component may include an ethylene glycol monomer.

[Formula 2]

In Formula 2, M is Li, Na, K, Rb or Cs, preferably Na.

In addition, the monomer represented by Formula 2 may preferably be a monomer represented by Formula 2-1.

[Formula 2-1]

In Formula 2-1, M is Li, Na, K, Rb or Cs, preferably Na.

Specifically, in the second component of the present invention, the acid component and the glycol component may be copolymerized at a polymerization ratio of 1: 0.9 to 1.5, preferably at a ratio of 1: 1.0 to 1.4, more preferably at a ratio of 1: 1.1 to 1.3. .

In addition, the acid component of the second component of the present invention may include 1 to 5 mol%, preferably 1.4 to 2.2 mol% of the monomer represented by Formula 2 with respect to the total mole% of the acid component. If the monomer represented by the formula (2) is contained less than 1 mol% there may be a problem that the dyeing is not smooth due to insufficient number of seating seats, if it contains more than 5 mol% there may be problems such as trimming occurs when producing elastic fibers have.

In addition, the acid component of the second component of the present invention may include a residual amount of terephthalic acid monomer, excluding the mole% of the monomer represented by the formula (2).

On the other hand, the second component of the present invention may have a melting temperature (Tm) of 200 ~ 250 ℃, preferably 2100 ~ 230 ℃, if the melting temperature is less than 200 ℃ may have a problem of solidification during spinning, 230 If it exceeds C, there may be a problem in the polymer melting process.

In addition, the second component of the present invention may have an intrinsic viscosity (IV) of 0.45 to 0.68 dl / g, preferably 0.5 to 0.60 dl / g, and if the intrinsic viscosity is less than 0.45 dl / g, the composite fiber of the present invention There may be a problem that the strength of the lowering, if it exceeds 0.68 dl / g there may be a problem of the elasticity and spinning properties of the composite fiber of the present invention.

Furthermore, the weight ratio of the first component and the second component of the present invention may be 1: 0.8 to 1.2, preferably 1: 0.9 to 1.1.

On the other hand, the cross-sectional shape of the composite fiber of the present invention may be a peanut side-by-side or circular side-by-side. Specifically, Figure 1 is a schematic diagram of a side-by-side composite fiber having a peanut-shaped cross-sectional shape according to a preferred embodiment of the present invention, Figure 2 is a cross-sectional shape of a peanut type according to a preferred embodiment of the present invention As a SEM image of the side-by-side composite fiber having a shape, referring to FIGS. 1 and 2, the cross-sectional shape is peanut-shaped, and the first component 101 and the second component 102 are included in the composite fiber. You can check the shape. In addition, Figure 3 is a schematic diagram of a side-by-side composite fiber having a circular cross-sectional shape according to a preferred embodiment of the present invention, Figure 4 is a side- having a circular cross-sectional shape in a preferred embodiment of the present invention As a SEM photograph of the bi-side composite fiber, referring to FIGS. 3 and 4, the cross-sectional shape is circular, and the shape in which the first component 112 and the second component 113 are included in the composite fiber can be confirmed. .

Furthermore, the composite fiber of the present invention may have a fineness of 20 to 180 denier, preferably a fineness of 130 to 170 denier, a filament number of 12 to 96, preferably a filament number of 36 to 60, and is not particularly limited thereto. It can be changed according to the purpose.

On the other hand, the composite fiber of the present invention may satisfy 7 to 30%, preferably 12 to 18% non-water shrinkage (Boiling water shringkage). As such, by satisfying the range of non-aqueous export rate, there are advantages of elasticity and touch. If the non-aqueous shrinkage is less than 7% there may be a problem that the elastic properties are deteriorated, if the non-aqueous shrinkage is more than 30% there is a problem that the touch feeling worsens due to hardening.

Furthermore, the composite fiber of the present invention may have a stretch (%) of 5 to 25%, preferably 10 to 20%, as measured by Equation 1 below. If elasticity is less than 5%, there may be a problem of elastic recovery, and if it exceeds 25%, there may be a problem of process workability.

Equation 1

In Equation 1, the elasticity is applied to the composite fiber 20.5g load, left for 10 minutes to measure the initial length, in a state of applying 20.5g load 10 minutes in hot water at 82 ℃ 3 to 5 After drying for a minute, the later length is measured.

On the other hand, the method for producing a polyester composite fiber excellent in elasticity of the present invention includes a first step to a third step.

First, the first step of the method for producing a polyester fiber having excellent elasticity of the present invention comprises a polyester-based elastomer prepared by copolymerizing a terephthalic acid monomer, isophthalic acid monomer, a monomer represented by the formula (1) and ethylene glycol monomer The first component can be melted.

[Formula 1]

In Chemical Formula 1, A is -CH ₂ CH ₂ CH _2- , -CH ₂ CH ₂ CH ₂ CH _2- , -CH ₂ CH ₂ CH ₂ CH ₂ CH _2- , -CH ₂ CH ₂ CH ₂ CH ₂ CH ₂ CH ₂ -or -CH ₂ CH ₂ CH ₂ CH ₂ CH ₂ CH ₂ CH _2- , preferably -CH ₂ CH ₂ CH _2- , -CH ₂ CH ₂ CH ₂ CH ₂ -or -CH ₂ CH ₂ CH ₂ CH ₂ CH _2- .

In addition, in Formula 1, n is a ratio of 500 to 5,000, preferably 800 to 2,000, of the weight average molecular weight (Mw) of the monomer.

Next, the second step of the method for producing a polyester composite fiber excellent in elasticity of the present invention is a second component comprising a polyester compound prepared by copolymerizing a terephthalic acid monomer, a monomer represented by the following formula (2) and an ethylene glycol monomer Can be melted.

[Formula 2]

In Formula 2, M is Li, Na, K, Rb or Cs, preferably Na.

In addition, the monomer represented by Formula 2 may preferably be a monomer represented by Formula 2-1.

[Formula 2-1]

In Formula 2-1, M is Li, Na, K, Rb or Cs, preferably Na.

Finally, the third step of the method for producing a polyester composite fiber excellent in elasticity of the present invention can produce a polyester composite fiber by composite spinning the first component and the second component melted in the first and second steps have.

At this time, the third step of the composite spinning may be carried out at a temperature of 230 ~ 300 ℃, preferably 250 ~ 300 ℃, if the temperature is less than 230 ℃ may have a problem in polymer flowability, 300 ℃ If it exceeds, there may be a problem of deterioration of physical properties due to molecular weight decrease by pyrolysis.

In addition, the third step of the composite spinning can be carried out at a speed of 3000 ~ 5000 mpm, preferably 3500 ~ 4500 mpm, if the discharge is less than 3000 mpm, the orientation difference between the two polymers is not large, there is a problem of elasticity If it exceeds 5000 mpm, there may be a problem of trimming during spinning due to the high stress during solidification.

On the other hand, the third step of the composite spinning can be carried out through various forms of detention, preferably cross-sectional shape through the side-by-side detention of the peanut-shaped cross-section or side-by-side detention of the circular cross-sectional shape The cross-sectional shape may be made of a composite fiber having a peanut side-by-side or circular side-by-side.

Further, the polyester composite fiber produced by the composite spinning in the third step, the stretching temperature of 40 ~ 110 ℃, preferably the stretching temperature of 50 ~ 100 ℃, the heat treatment temperature of 80 ~ 140 ℃, preferably 110 ~ 130 ℃ The stretching process can be carried out at a heat treatment temperature of and a draw ratio of 1.5 to 4.0, preferably a draw ratio of 2.2 to 3.0.

On the other hand, the present invention includes a blended fiber comprising a polyester composite fiber excellent in the aforementioned elasticity.

The blended fiber may include heterogeneous fibers other than the composite fiber according to the present invention, and specific examples include at least one selected from the group consisting of nylon 6, nylon 66, nylon 6.10 and aramid (Aramid). Polyamide-based fibers or polyester-based resins including any one or more of polyethylene terephthalate (PET), modified polyethylene terephthalate (PET), polytetramethylene terephthalate (PTT) and polybutylene terephthalate (PBT) It may be a fiber of. The modified polyethylene terephthalate (PET) may be specifically modified as a specific monomer is added in PET, wherein the copolymerization ratio of each monomer is not particularly limited in the present invention. The specific monomer may include, as an acid component, an aromatic polyvalent carboxylic acid, an aliphatic polyvalent carboxylic acid, and a polyvalent carboxylic acid including a hetero ring, and may further include other sulfonic acid metal salts.

More specifically, as a non-limiting example of the aromatic polyhydric carboxylic acid, dimethyl terephthalic acid, isophthalic acid, dimethyl isophthalic acid, etc. other than terephthalic acid can be used.

In addition, as non-limiting examples of the aliphatic polyhydric carboxylic acid, oxalic acid, malonic acid, succinic acid, glutaric acid, adipic acid, sumeric acid, citric acid, pimeric acid, azelaic acid, sebacic acid, nonanoic acid, deca Senile acid, dodecanoic acid, hexanodecanoic acid and the like can be used.

In addition, examples of the non-limiting examples of the polyvalent carboxylic acid containing the heterocycle include 2,5-furandicarboxylic acid, 2,5-thiophendicarboxylic acid, 2,5-pyrroledicarboxylic acid, and the like. have.

Non-limiting examples of the sulfonic acid metal salt include sodium 3,5-dicarbomethoxybenzene sulfonate, lithium 3,5-dicarbomethoxybenzene sulfonate, 5-sulfoisophthalic acid monosodium salt, and the like. Can be used

Next, an aliphatic diol having 2 to 14 carbon atoms may be included as a diol component. As a non-limiting example of the aliphatic diol, diethylene glycol, neopentyl glycol, 1,3-propanediol, 1, 4-butanediol and 1,6-hexanediol, propylene glycol, trimethyl glycol, tetramethylene glycol, pentamethylene glycol, hexamethylene glycol, heptamethylene glycol, octamethylene glycol, nonamethylene glycol, decamethylene glycol, undecamethylene Any one or more selected from the group consisting of glycol, dodecamethylene glycol and tridecamethylene glycol can be used.

In addition, in addition to the aliphatic diol, it may further include a polyalkylene glycol, the molecular weight of the polyalkylene glycol may be 1,000 to 10,000.

If the heterogeneous yarn is a polyester fiber, then the woven fabric may include titanium dioxide in the polyester fiber to have a more improved gloss and powdery touch. Preferably titanium dioxide may be included in the fiber 1.0 to 2.5% by weight. If the titanium dioxide is included in less than 1.0% by weight may have a problem that the touch is significantly reduced, if it is included in excess of 2.5% by weight may have a problem that the string is generated in the fabric.

In addition, the polyester fiber may further include a material capable of imparting functionality such as flame retardancy and antimicrobial properties, and may preferably include 0.4 to 10% by weight of a single or mixed form of a phosphorus-based flame retardant and an inorganic antimicrobial agent. . If it is included in less than 0.4% by weight, there is a problem that the expression of the flame retardant or antimicrobial function is insufficient, if it is included in more than 10% by weight may increase the cost and lose competitiveness.

The blended fiber may be blended with any one of the fibers of the different types as the screening and the other yarn as the yarn, or may blend the fibers of the different types without the distinction between the screening and the yarn.

In addition, the present invention provides a fabric comprising a polyester composite fiber excellent in the aforementioned elasticity. The term "fabric" used in the present invention is meant to include both woven and knitted fabrics. First, the fabric may be a weaving fabric using a polyester composite fiber having excellent elasticity according to the present invention as any one or more of warp and weft yarns.

The weaving may be made by any one method selected from the group consisting of plain weave, twill weave, satin weave and double weave.

When the plain weave, twill weave and silk weave are three-way tissues, the specific weaving method of each of the three-way tissues is a conventional weaving method, and the fabric may be changed by modifying the tissue or combining several tissues based on the three-way tissue. For example, change plain weaves are weaving weaves, basket weaves, etc. Change twill weaves include new work, wave power weaves, non-twill weaves, and vocational twills. There is this.

The double weave is a method of weaving a fabric in which either one of the warp yarn or the weft is double or both of them is double, and a specific method may be a conventional double weaving method.

However, it is not limited to the base material of the fabric structure, the case of the weft density in the weaving is not particularly limited.

In addition, the fabric may be a knitted fabric comprising a polyester composite fiber excellent in elasticity as a yarn. The knitting may be by the method of knitting or warp knitting, the specific method of the knitting and warp knitting may be by the conventional knitting method of knitting or warp knitting.

The present invention has been described above with reference to the embodiments, which are merely exemplary and are not intended to limit the embodiments of the present invention, and those skilled in the art to which the embodiments of the present invention belong may have the essential characteristics of the present invention. It will be appreciated that various modifications and applications not illustrated above are possible without departing from the scope of the invention. For example, each component specifically shown in the embodiment of the present invention may be modified. And differences relating to such modifications and applications will have to be construed as being included in the scope of the invention defined in the appended claims.

Example 1 Preparation of Polyester Composite Fiber

(1) Copolymerization of 59 mol% of terephthalic acid monomers, 22 mol% of isophthalic acid monomers, 7 mol% of monomers represented by the following formula (1-1) and 12 mol% of ethylene glycol monomers with respect to the total mol% of the first component as the first component A polyester elastomer having a melt temperature of 160 ° C., a melt index (MI) of 11, and a hardness of 30, as measured by Shore hardness tester Shore D, was prepared.

(2) A polyester compound having a melting temperature of 220 ° C. and an intrinsic viscosity (I.V) of 0.50 dl / g was prepared by copolymerizing a terephthalic acid monomer, a monomer represented by the following Chemical Formula 2-2, and an ethylene glycol monomer as a second component. In this case, the acid component and the ethylene glycol monomer were copolymerized at a polymerization ratio of 1: 1.2, and the acid component was 98.2 mol% of the terephthalic acid monomer and 1.8 mol% of the monomer represented by the following Chemical Formula 2-2 based on the total mol% of the acid component. .

(3) Melting the first component and the second component, and performing a composite spinning using a side-by-side detention of the peanut-shaped cross-sectional shape, to obtain a polyester composite fiber having a cross-sectional shape peanut-side-by-side Prepared. The composite spinning was carried out in a 1: 1 weight ratio of the first component and the second component, at a temperature of 275 ° C. and at a flux of 4000 mpm.

(4) A stretching process of the prepared polyester composite fiber was performed. The stretching process was carried out at a stretching temperature of 75 ℃, a stretching ratio of 2.65 and a heat treatment temperature of 120 ℃, was wound to prepare a polyester composite fiber having a fineness of 150 denier, the number of filaments of 48.

[Formula 1-1]

In Formula 1-1, A is -CH ₂ CH ₂ CH ₂ CH _2- , and n is a rational number satisfying the weight average molecular weight (Mw) of the monomers 1,000.

[Formula 2-2]

In Chemical Formula 2-2, M is Na.

Example 2 Preparation of Polyester Composite Fiber

Polyester composite fibers were prepared in the same manner as in Example 1. However, unlike Example 1, the melting temperature is 220 ° C., intrinsic by copolymerizing 98.2 mol% of terephthalic acid monomer and 1.8 mol% of the monomer represented by Formula 2-2 with respect to the total mol% of the acid component as the acid component of the second component. A polyester compound having a viscosity of 0.65 dl / g was prepared.

Example 3 Preparation of Polyester Composite Fiber

Polyester composite fibers were prepared in the same manner as in Example 1. However, unlike Example 1 by copolymerizing 88 mol% of terephthalic acid monomer and 12 mol% of the monomer represented by Formula 1-1 with respect to the total mol% of the first component as the first component, the melting temperature is 195 ℃, melt index A polyester-based elastomer having a hardness of 40 as measured by (MI) and Shore D Shore D was prepared.

In addition, unlike Example 1, the stretching step was carried out at a stretching temperature of 80 ℃.

Comparative Example 1: Preparation of Polyester Composite Fiber

Polyester composite fibers were prepared in the same manner as in Example 1. However, unlike Example 1, the terephthalic acid monomer and ethylene glycol were copolymerized at a polymerization ratio of 1: 1.2 without using the monomer represented by Formula 2-2 as the second component, and the melting temperature was 250 ° C. and the inherent viscosity was 0.50 dl. / g polyester compound was prepared.

In addition, unlike Example 1, the stretching step was carried out at a stretching temperature of 80 ℃.

Comparative Example 2: Preparation of Polyester Composite Fiber

Polyester composite fibers were prepared in the same manner as in Example 1. However, unlike Example 1 by copolymerizing 88 mol% of terephthalic acid monomer and 12 mol% of the monomer represented by Formula 1-1 with respect to the total mol% of the first component as the first component, the melting temperature is 195 ℃, melt index A polyester-based elastomer having a hardness of 40, measured by (MI) of 8 and Shore D, was prepared.

Unlike Example 1, the terephthalic acid monomer and ethylene glycol are copolymerized at a polymerization ratio of 1: 1.2 without using the monomer represented by Formula 2-2 as the second component, and the melting temperature is 250 ° C. and the inherent viscosity is 0.50 dl / g. A phosphorus polyester compound was prepared.

In addition, unlike Example 1, the stretching step was carried out at a stretching temperature of 80 ℃.

Experimental Example 1 Measurement of Physical Properties of Polyester Composite Fiber

Each of the polyester composite fibers prepared in Examples 1 to 3 and Comparative Examples 1 to 2 was subjected to the experiments described below, and the results measured through the results are shown in Table 1 below.

1. Measurement of radiooperability

In the production of polyester composite fibers in Examples 1 to 3 and Comparative Examples 1 to 2, when the production amount produced without trimming is 100%, when 90% or more is produced without trimming, it is good to produce less than 90%. The operation time was measured by making the time a defect.

2. Measurement of strength and elongation

Using an automatic tensile tester (Textechno) was measured by applying a gripping distance of 200 cm / min, 50 cm. Strength and elongation is the strength divided by the denier divided by the load (g / de) divided by the denier, and the initial length as a percentage of the elongated length (%). Defined.

3. Elasticity measurement

Elasticity was calculated and measured by the following equation 1.

Equation 1

In Equation 1, the elasticity is applied to the composite fiber 20.5g load, left for 10 minutes to measure the initial length, immersed in hot water at 82 ℃ for 10 minutes with a load of 20.5g and dried for 4 minutes Afterwards measure the length.

4. Measuring Boiling Water Shringkage

The specific shrinkage ratio was measured by applying a fineness (denier) * 2g to measure the length of the composite fiber, and then treating the composite fiber in boiling water at 100 ° C. for 30 minutes to measure the length of the composite fiber after drying, according to Equation 2 below. Non-export rate was calculated and measured.

[Equation 2]

5. Dyeing measurement (surface dyeing concentration measurement)

Composite fiber To prepare a fabric, the fabric was dyed with Kuralon Navy Blue at a temperature of 130 ℃. The color intensity of the dyed fabric was determined by measuring the surface reflectance using a Spectrophotometer. The K / S value was measured from the surface reflectance according to the following Kubelka-Munk equation. At this time, the K / S value was calculated as an average value by measuring the front and back of the fabric twice a total of four times. Larger value of α means better deep colorability.

Kubelka-Munk Expression

α = K / S = (1-R) ² / 2R

(K: absorption coefficient, S: scattering coefficient, R: reflection coefficient (0 <R≤1))

When good stainability is expressed, O is expressed, and when dyeability is not expressed, X is measured to measure dyeability.

As can be seen in Table 1, the composite fiber prepared in Example 1 has a good dyeing property when dyed with a cationic dye (Cationic-Dye), it was confirmed that the excellent elasticity, rubber-like touch can be satisfied.

In addition, the composite fibers prepared in Examples 2 to 3 can also be dyed with a cationic dye and satisfy rubber-like touch, but the composite fibers prepared in Example 2 have high intrinsic viscosity (IV) of the second component. It was confirmed that the elasticity is lower than that of the composite fiber prepared in Example 1.

In addition, in the case of the composite fiber prepared in Example 3 it can be seen that the problem of deterioration in spinning operation.

In addition, the composite fiber prepared in Comparative Examples 1 and 2 was confirmed that the dyeing does not occur.

Simple modifications or changes of the present invention can be easily made by those skilled in the art, and all such modifications or changes can be seen to be included in the scope of the present invention.

Claims (14)

In the polyester composite fiber produced by complex spinning the first component and the second component,
The first component is 5 to 25 mol% of isophthalic acid monomers, 3 to 15 mol% of monomers represented by the following general formula (1), 5 to 20 mol% of ethylene glycol monomers, and the remaining amount of terephthalic acid monomers based on the total mol% of the first component. It comprises a polyester-based elastomer prepared by copolymerization,
The second component includes a polyester compound having a melting temperature (Tm) of 200 to 250 ° C. and an intrinsic viscosity (IV) of 0.45 to 0.60 dl / g prepared by copolymerizing an acid component and a glycol component.
The acid component includes 1 to 5 mol% of the monomer represented by Formula 2 and the remaining amount of terephthalic acid monomer with respect to the total mole% of the acid component, and the glycol component includes an ethylene glycol monomer. Polyester composite fiber.
[Formula 1]

In Chemical Formula 1, A is -CH ₂ CH ₂ CH _2- , -CH ₂ CH ₂ CH ₂ CH _2- , -CH ₂ CH ₂ CH ₂ CH ₂ CH _2- , -CH ₂ CH ₂ CH ₂ CH ₂ CH ₂ CH ₂ -or -CH ₂ CH ₂ CH ₂ CH ₂ CH ₂ CH ₂ CH _2- , n is a rational number satisfying the weight average molecular weight (Mw) 500 ~ 5,000 of the monomer,
[Formula 2]

In Formula 2, M is Li, Na, K, Rb or Cs.
delete delete The method of claim 1,
The polyester composite fiber excellent in elasticity, characterized in that the weight ratio of the first component and the second component is 1: 0.8 to 1.2.
The method of claim 1,
The first component is a polyester fiber having excellent elasticity, characterized in that the melting temperature (Tm) is 130 ~ 220 ℃, melt index (MI) 7 ~ 21, the hardness measured by Shore D hardness Shore D 20 ~ 50 .
delete The method of claim 1,
The cross-sectional shape of the composite fiber is a polyester elastic fiber having excellent elasticity, characterized in that the peanut side-by-side or circular side-by-side.
The method of claim 1,
The composite fiber has excellent elasticity polyester composite fiber, characterized in that it has a fineness of 20 ~ 180 denier, filament number of 12 ~ 96.
The method of claim 1,
The composite fiber is a polyester fiber having excellent elasticity, characterized in that the elasticity (%) measured by the following equation 1 is 5 to 25%.
Equation 1

In Equation 1, the elasticity is applied to the composite fiber 20.5g load, left for 10 minutes to measure the initial length, in a state of applying 20.5g load 10 minutes in hot water at 82 ℃ 3 to 5 The latter length is measured after drying for minutes.
A first step of melting a first component comprising a polyester-based elastomer prepared by copolymerizing a terephthalic acid monomer, an isophthalic acid monomer, a monomer represented by Formula 1 and an ethylene glycol monomer;
A second step of melting a second component comprising a polyester compound having a melting temperature (Tm) of 200 to 250 ° C. and an intrinsic viscosity (IV) of 0.45 to 0.60 dl / g prepared by copolymerizing an acid component and a glycol component; And
A third step of producing a polyester composite fiber by complex spinning the molten first component and the second component; Including,
The first component is 5 to 25 mol% of isophthalic acid monomers, 3 to 15 mol% of monomers represented by the following general formula (1), 5 to 20 mol% of ethylene glycol monomers, and the remaining amount of terephthalic acid monomers based on the total mol% of the first component. Include,
The acid component includes 1 to 5 mol% of the monomer represented by Formula 2 and the remaining amount of terephthalic acid monomer with respect to the total mole% of the acid component, and the glycol component includes an ethylene glycol monomer. Method for producing polyester composite fiber.
[Formula 1]

In Chemical Formula 1, A is -CH ₂ CH ₂ CH _2- , -CH ₂ CH ₂ CH ₂ CH _2- , -CH ₂ CH ₂ CH ₂ CH ₂ CH _2- , -CH ₂ CH ₂ CH ₂ CH ₂ CH ₂ CH ₂ -or -CH ₂ CH ₂ CH ₂ CH ₂ CH ₂ CH ₂ CH _2- , n is a rational number satisfying the weight average molecular weight (Mw) 500 ~ 5,000 of the monomer,
[Formula 2]

In Formula 2, M is Li, Na, K, Rb or Cs.
The method of claim 10,
The composite spinning method of producing a polyester fiber with excellent elasticity, characterized in that carried out at a temperature of 230 ~ 300 ℃ and a flux of 3000 ~ 5000 mpm.
The method of claim 10,
The polyester having excellent stretchability, characterized in that the stretching process of the polyester composite fiber prepared by the composite spinning in the third step at a stretching temperature of 40 ~ 110 ℃, heat treatment temperature of 80 ~ 140 ℃ and a draw ratio of 1.5 ~ 4.0 Method for producing ester composite fiber.
A blending process comprising a polyester composite fiber excellent in elasticity according to any one of claims 1, 4, 5, and 7 to 9.
A fabric comprising a polyester composite fiber excellent in elasticity according to any one of claims 1, 4, 5, and 7-9.

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