WO2020246719A1 - Polyester composite fibers having excellent elasticity and preparation method thereof - Google Patents

Abstract

The present invention relates to polyester composite fibers having excellent elasticity and a preparation method thereof and, more specifically, to polyester composite fibers and a preparation method thereof, the fibers being side-by-side composite fibers having an intrinsic viscosity of 0.60-0.80 dl/g and a Leesona shrinkage (%) of 15-30% and having been prepared by means of composite spinning a first component and a second component, the fibers having enhanced elasticity, not showing glossiness and feeling excellent to the touch.

Description

Polyester composite fiber with excellent elasticity and its manufacturing method

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 and excellent touch without gloss and a method for manufacturing the same. .

Recently, as the demand for fabrics requiring high elasticity increases, the market demand for spandex is on the rise. Spandex is a type of polyurethane fiber, which is melt-spun by polymerizing polyether and methylenediphenyl isocyanate. Spandex is lighter than rubber bands and has stronger aging resistance. Have.

In addition, spandex is a unique fiber with elasticity similar to rubber, and its tensile strength and/or ultimate strength is very high, so it does not break easily, and it is elastic enough to be extended 5 to 8 times its original length. have.

In addition, spandex does not get dirty from sweat, oil or cosmetics, and is resistant to washing. In addition, spandex can be pulled out thinner than rubber and has good dyeability.

On the other hand, spandex has excellent elasticity, so it is easy to work with, and has excellent durability, sweating, and drying properties, so it is widely used for various purposes such as underwear, lining, and outerwear. In addition, spandex has the advantage of giving a pleasant feeling due to high sweating and drying ability to quickly expel sweat.

However, spandex is expensive, weak to heat, generates static electricity, has problems with alkali resistance, spandex yarn alone cannot be used, and requires a separate covering process. Therefore, there was a limit to the market's demand for increasingly thinner fabrics because there was no choice but to obtain a relatively thick fabric.

In order to overcome these shortcomings of spandex, an elastic latent winding yarn was proposed. Latent crimped fiber is heat-shrinkable by applying heat in a spinning or drawing process after complex spinning of two types of polymers with different heat shrinkage properties in a side-by-side or sheath-core. It is a fiber that physically has a coil shape due to the difference and gives high elasticity with a principle similar to that of a spring. In terms of elasticity, it is not comparable to the existing spandex fiber, but as a disadvantage of spandex mentioned above, a lot of latent crimped fibers are used, which are excellent in alkali resistance and shape stability, and easy to dye and post-process.

On the other hand, as a latent crimped fiber, conventionally, a fiber obtained by composite spinning a polyester resin having a viscosity difference has been proposed, but the fiber produced in this way has a problem that is insufficient to obtain the desired elasticity.

In addition, a composite fiber containing polytetramethylene terephthalate (PTT) in latent crimped yarn has been suggested for high elasticity, but polytetramethylene terephthalate has a high cost of monomers required during polymerization. There was a problem of increasing the manufacturing cost.

The present invention has been devised to solve the above problems, and an object of the present invention is to provide a polyester composite fiber having excellent elasticity and a method of manufacturing the same, which does not generate gloss, has excellent touch feeling, and has excellent elasticity.

In order to solve the above-described problem, the polyester composite fiber having excellent elasticity of the present invention may be a polyester composite fiber produced by composite spinning of the first component and the second component.

In a preferred embodiment of the present invention, the first component may include polybutelene terephthalate (PBT).

In a preferred embodiment of the present invention, the second component may include polyethylene terephthalate (PET).

In a preferred embodiment of the present invention, the polyester composite fiber of the present invention may satisfy the following relational formula 1.

[Relationship 1]

0.30 dl/g ≤ |A-B| ≤ 0.80 dl/g

In the above relational formula 1, A represents the intrinsic viscosity of the first component, and B represents the intrinsic viscosity of the second component.

In a preferred embodiment of the present invention, the intrinsic viscosity of the first component may be 0.90 to 1.30 dl/g.

In a preferred embodiment of the present invention, the melting point of the first component may be 200 ~ 250 ℃.

In a preferred embodiment of the present invention, the intrinsic viscosity of the second component may be 0.40 to 0.70 dl/g.

In a preferred embodiment of the present invention, the melting point of the second component may be 230 ~ 270 ℃.

In a preferred embodiment of the present invention, the first component may further include a matting agent.

In a preferred embodiment of the present invention, the second component may further include a matting agent.

In a preferred embodiment of the present invention, the matting agent may include at least one selected from titanium oxide (TiO ₂ ), zinc oxide (ZnO), silicon oxide (SiO ₂ ), and barium sulfate (BaSO ₄ ).

In a preferred embodiment of the present invention, the first component may contain 1.0 to 3.0% by weight based on the total weight% of the matting agent.

In a preferred embodiment of the present invention, the second component may contain 1.0 to 3.0% by weight of a matting agent based on the total weight%.

In a preferred embodiment of the present invention, the weight ratio of the first component and the second component may be 30:70 to 70:30.

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

In a preferred embodiment of the present invention, the intrinsic viscosity of the polyester composite fiber of the present invention may be 0.50 to 0.80 dl/g.

In a preferred embodiment of the present invention, the polyester composite fiber of the present invention may contain 1.0 to 3.0% by weight of a matting agent based on the total weight%.

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

In a preferred embodiment of the present invention, the polyester composite fiber of the present invention may have a lysona shrinkage (%) measured by Equation 1 below of 15 to 30%.

[Equation 1]

In Equation 1, the lysona shrinkage rate is measured by applying a load of 20.5 g to the composite fiber to measure the initial length (L ₀ ), and immersing it in hot water at 82°C for 10 minutes while applying a load of 20.5 g for 3 minutes. After drying, the length (L ₁ ) is measured after treatment.

In a preferred embodiment of the present invention, the polyester composite fiber of the present invention may have a residual shrinkage (%) of 45 to 70% measured by Equation 2 below.

[Equation 2]

In Equation 2, the residual shrinkage is measured by applying a load of 1.5 g to the composite fiber to measure the initial length (L ₀ ), immersing it in hot water at 82° C. for 10 minutes and drying for 3 minutes while applying a load of 1.5 g. After treatment, the length (L ₁ ) is measured.

On the other hand, the method of manufacturing a polyester composite fiber having excellent elasticity of the present invention is a first step of melting the first component and the second component, respectively, and composite spinning of the melted first component and the second component to produce a polyester composite fiber. It may include a second step.

In a preferred embodiment of the present invention, the prepared composite fiber may be a side-by-side composite fiber having an intrinsic viscosity of 0.60 to 0.80 dl/g.

In a preferred embodiment of the present invention, the manufactured composite fiber may have a lysona shrinkage (%) measured by Equation 1 below of 15 to 30%.

[Equation 1]

In Equation 1, the lysona shrinkage rate is measured by applying a load of 20.5 g to the composite fiber to measure the initial length (L ₀ ), and immersing it in hot water at 82°C for 10 minutes while applying a load of 20.5 g for 3 minutes. After drying, the length (L ₁ ) is measured after treatment.

In a preferred embodiment of the present invention, the first component may include polybutelene terephthalate (PBT) and a matting agent.

In a preferred embodiment of the present invention, the second component may include polyethylene terephthalate (PET) and a matting agent.

In a preferred embodiment of the present invention, the method for producing a polyester composite fiber having excellent elasticity of the present invention may satisfy the following relational formula 1.

[Relationship 1]

0.30 dl/g ≤ |A-B| ≤ 0.80 dl/g

In the above relational formula 1, A represents the intrinsic viscosity of the first component, and B represents the intrinsic viscosity of the second component.

In a preferred embodiment of the present invention, the polyester composite fiber produced in the method for producing a polyester composite fiber having excellent elasticity of the present invention may have a full rate (%) measured by Equation 3 below of 80% or more.

[Equation 3]

Further, the fabric of the present invention includes the aforementioned polyester composite fiber having excellent elasticity.

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

In the present invention, the term'fiber' as used means'yarn' or'thread', and generally refers to various types of yarns and fibers.

The term'composite fiber' as used in the present invention is used to mean the yarn itself manufactured by composite spinning, or to include stretched and/or partially stretched coarse fibers.

The'heat treatment temperature' used in the present invention means the surface temperature of the secondary godet roller among the godet rollers commonly used in the stretching process.

The polyester composite fiber having excellent elasticity of the present invention does not generate gloss and has excellent touch.

In addition, the polyester composite fiber having excellent elasticity of the present invention can be applied to a variety of products that require the use of excellent elasticity and non-glossy fiber. Specifically, the polyester composite fiber having excellent elasticity of the present invention is suitable to be used as a yarn for a fabric or knitted fabric requiring elasticity, and at the same time, the fabric including the same does not generate gloss, has a good touch feeling, and has excellent elasticity.

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.

2 is an SEM photograph of a side-by-side composite fiber having a peanut-shaped cross-sectional shape according to a preferred embodiment of the present invention.

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.

4 is a SEM photograph of a side-by-side composite fiber having a circular cross-sectional shape according to a preferred embodiment of the present invention.

5 is a manufacturing process flow diagram according to a preferred embodiment of the present invention.

6 is a schematic diagram of a manufacturing process according to a preferred embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those of ordinary skill in the art can easily implement the present invention. The present invention may be implemented in various different forms, and is not limited to the embodiments described herein. In the drawings, parts not related to the description are omitted in order to clearly describe the present invention, and the same reference numerals are added to the same or similar components throughout the specification.

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

The first component of the polyester composite fiber having excellent stretchability of the present invention may include polybutene terephthalate (PBT). As an example, polybutelene terephthalate (PBT) may be prepared by polymerizing butanediol and terephthalic acid.

In addition, the second component of the polyester composite fiber having excellent elasticity of the present invention may include polyethylene terephthalate (PET). As an example, polyethylene terephthalate (PET) may be prepared by polymerizing ethylene glycol and terephthalic acid.

On the other hand, the polyester composite fiber having excellent elasticity of the present invention may satisfy the following relational equation 1, and if it deviates from the range described in the following relational equation 1, there may be a problem in that the elasticity expression is weak.

[Relationship 1]

0.30 dl/g ≤ |A-B| ≤ 0.80 dl/g, preferably 0.4 dl/g ≤ |A-B| ≤ 0.70 dl/g, more preferably 0.4 dl/g ≤ |A-B| ≤ 0.60 dl/g, even more preferably 0.45 dl/g ≤ |A-B| ≤ 0.53 dl/g, even more preferably 0.45 dl/g ≤ |A-B| ≤ 0.49 dl/g

In the above relational formula 1, A represents the intrinsic viscosity of the first component, and B represents the intrinsic viscosity of the second component.

Further, the first component of the present invention has an intrinsic viscosity (IV) of 0.90 to 1.30 dl/g, preferably 0.92 to 1.30 dl/g, more preferably 0.95 to 1.15 dl/g, and even more preferably 0.95 to 1.05 dl/g, and if the intrinsic viscosity is less than 0.90dl/g, there may be a problem that the desired elasticity cannot be expressed, and if it exceeds 1.30 dl/g, the howitzing phenomenon of the composite fiber produced during composite spinning is remarkably There may be a problem that the spinning operation becomes poor due to an increase.

In addition, the second component of the present invention has an intrinsic viscosity (IV) of 0.40 to 0.70 dl/g, preferably 0.45 to 0.65 dl/g, more preferably 0.48 to 0.60 dl/g, even more preferably 0.48 to 0.53 dl/g, and if the intrinsic viscosity is less than 0.40 dl/g, there may be a problem that the howitzing phenomenon of the composite fiber produced during composite spinning increases significantly, resulting in poor spinning operation. If it exceeds 0.70 dl/g There may be a problem that the desired elasticity cannot be expressed.

On the other hand, the first component of the present invention may have a melting point of 200 to 250 °C, preferably 210 to 240 °C, more preferably 220 to 230 °C, and if the melting point is less than 200 °C, the crystallinity of the first component There may be a problem that the strength of the composite fiber is lowered, and the strength of the composite fiber to be manufactured is lowered, and when the melt spinning temperature is higher when the temperature exceeds 250°C, thermal decomposition occurs when the first component is melted, thereby reducing the strength of the composite fiber There may be.

In addition, the second component of the present invention may have a melting point of 230 to 270 °C, preferably 240 to 265 °C, more preferably 250 to 260 °C, and if the melting point is less than 230 °C, the crystallinity of the second component There may be a problem that the strength of the composite fiber is lowered, and the strength of the composite fiber to be manufactured is lowered, and when the melt spinning temperature is higher when it exceeds 270°C, thermal decomposition occurs when the second component is melted, thereby reducing the strength of the composite fiber to be manufactured. There may be.

Furthermore, the first component of the present invention may further include a matting agent. In this case, the matting agent may include at least one selected from titanium oxide (TiO ₂ ), zinc oxide (ZnO), silicon oxide (SiO ₂ ), and barium sulfate (BaSO ₄ ), preferably titanium oxide (TiO ₂ ) may be included. In addition, titanium oxide may have an anatase-type, rutile-type, or bruchite-type crystal form, and titanium oxide may include the crystal form alone or as a mixture, but titanium oxide may include density, refractive index, and light reflection depending on the crystal form. And absorption characteristics are different, so they can be properly classified and used according to the purpose and use. In addition, titanium oxide subjected to surface treatment may be included in order to control performance such as dispersibility and light reflection performance in the polymer.

In addition, the first component of the present invention may contain a matting agent in an amount of 1.0 to 3.0% by weight, preferably 1.2 to 2.5% by weight, more preferably 1.5 to 2.0% by weight, based on the total weight%, and if the matting agent If it is included in less than 1.0% by weight, the gloss suppression effect is lowered, and there may be a problem that the touch feeling of the fabric manufactured using the composite fiber of the present invention is deteriorated.If it exceeds 3.0% by weight, quenching in the first component There may be a problem in that the agglomeration phenomenon of the agent increases, so that cutting occurs during spinning, resulting in poor spinning operation. In addition, the second component of the present invention may contain a matting agent in an amount of 1.0 to 3.0% by weight, preferably 1.2 to 2.5% by weight, more preferably 1.5 to 2.0% by weight, based on the total weight%, and if the matting agent If it is included in less than 1.0% by weight, the gloss suppression effect is lowered, and there may be a problem that the touch feeling of the fabric manufactured using the composite fiber of the present invention is deteriorated.If it exceeds 3.0% by weight, quenching in the second component There may be a problem in that the agglomeration phenomenon of the agent increases, so that cutting occurs during spinning, resulting in poor spinning operation.

On the other hand, the weight ratio of the first component and the second component of the present invention may be 30: 70 to 70: 30, preferably 35: 65 to 65: 35, more preferably 45: 55 to 55 to 40, if When the weight ratio of the first component is less than 30 or the weight ratio of the first component exceeds 70, the balance between the first component and the second component is not matched, resulting in severe grain sand, resulting in poor spinning operation, and the elasticity of the composite fiber. There may be a diminishing problem.

Further, the cross-sectional shape of the composite fiber of the present invention may be a peanut-type side-by-side or a circular side-by-side, preferably a peanut-type side-by-side. .

Specifically, FIG. 1 is a schematic diagram of a side-by-side composite fiber having a cross-sectional shape of a peanut type according to a preferred embodiment of the present invention, and FIG. 2 is a cross-sectional shape of a peanut type according to a preferred embodiment of the present invention. As a SEM photograph of the side-by-side composite fiber having, referring to FIGS. 1 and 2, the cross-sectional shape is a peanut type, and the first component 101 and the second component 102 are included in the composite fiber. You can check the shape. In addition, FIG. 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, and FIG. 4 is a side-by-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. .

In addition, the intrinsic viscosity of the composite fiber of the present invention may be 0.50 to 0.80 dl/g, preferably 0.60 to 0.80 dl/g, more preferably 0.60 to 0.70 dl/g.

Further, the composite fiber of the present invention has a fineness of 20 to 180 denier, preferably a fineness of 30 to 170 denier, more preferably a fineness of 50 to 100 denier, the number of filaments of 12 to 96, preferably of 20 to 60 denier. It may have the number of filaments, and is not particularly limited thereto, and may be changed according to the purpose.

On the other hand, the composite fiber of the present invention may have a lysona shrinkage (%) of 15 to 30%, preferably 17 to 25%, as measured by Equation 1 below.

[Equation 1]

In Equation 1, the lysona shrinkage rate is measured by applying a load of 20.5 g to the composite fiber to measure the initial length (L ₀ ), and immersing it in hot water at 82°C for 10 minutes while applying a load of 20.5 g for 3 minutes. After drying, the length (L ₁ ) is measured after treatment.

Specifically, Leesona shrinkage is the load on the skeined stretched yarn obtained by stretching the composite fiber at a primary godet roller speed of 1,700 mpm, a temperature of 73°C, a secondary godet roller speed of 4,400 mpm, and a temperature of 120°C. It may be a percentage of the original length of the contracted length after heat treatment in water at 82±3℃ for 10 minutes by giving 20.5g.

In addition, the composite fiber of the present invention may have a residual shrinkage (%) of 40 to 70%, preferably 47 to 63%, as measured by Equation 2 below.

[Equation 2]

In Equation 2, the residual shrinkage is measured by applying a load of 1.5 g to the composite fiber to measure the initial length (L ₀ ), immersing it in hot water at 82° C. for 10 minutes and drying for 3 minutes while applying a load of 1.5 g. After treatment, the length (L ₁ ) is measured.

Specifically, the residual shrinkage (%) is for the skeined drawn yarn obtained by stretching the composite fiber at a primary godet roller speed of 1,700 mpm, a temperature of 73°C, a secondary godet roller speed of 4,400 mpm, and a temperature of 120°C. It may be a percentage of the original length of the contracted length after heat treatment in water at 82±3° C. for 10 minutes by applying 1.5 g of load.

When the composite fiber of the present invention satisfies the lysona shrinkage rate of 15 to 30% and the residual shrinkage rate of 40 to 70%, the best elasticity can be expressed, if the lysona shrinkage rate is less than 15% or the residual shrinkage rate is less than 40%. In this case, there may be a problem that the elasticity is deteriorated, and when the lysona shrinkage rate exceeds 30% or the residual shrinkage rate exceeds 70%, the crimp expression in the yarn state becomes severe and the filaments become entangled with each other when manufacturing fabrics and knitted fabrics. There may be a problem that process workability is significantly deteriorated.

On the other hand, the method for producing a polyester composite fiber having excellent elasticity of the present invention includes a first step and a second step.

Specifically, FIG. 5 is a flow chart of a manufacturing process according to a preferred embodiment of the present invention, and when described with reference to FIG. 5, the first component and the second component are melted through a first step (S10). The composite fiber of the present invention may be manufactured through the second step (S11), and may additionally undergo a cooling and solidification step (S12), an oil supply step (S13), heat setting and stretching step (S14) after spinning.

First, the first step of the method for producing a polyester composite fiber having excellent elasticity of the present invention may melt the first component and the second component, respectively. In this case, the first component may include polybutelene terephthalate (PBT), and may further include a matting agent. In addition, the second component may include polyethylene terephthalate (PET), and may further include a matting agent.

In addition, the prepared composite fiber may be a side-by-side composite fiber having an intrinsic viscosity of 0.60 to 0.80 dl/g.

In addition, the prepared composite fiber may have a lysona shrinkage (%) measured by Equation 1 below of 15 to 30%.

[Equation 1]

In Equation 1, the lysona shrinkage rate is measured by applying a load of 20.5 g to the composite fiber to measure the initial length (L ₀ ), and immersing it in hot water at 82°C for 10 minutes while applying a load of 20.5 g for 3 minutes. After drying, the length (L ₁ ) is measured after treatment.

In addition, the following relational expression 1 may be satisfied, and if it is out of the range described in the following relational expression 1, there may be a problem in that the elasticity expression of the manufactured composite fiber is weak.

[Relationship 1]

0.30 dl/g ≤ |A-B| ≤ 0.80 dl/g, preferably 0.4 dl/g ≤ |A-B| ≤ 0.70 dl/g, more preferably 0.4 dl/g ≤ |A-B| ≤ 0.60 dl/g, even more preferably 0.45 dl/g ≤ |A-B| ≤ 0.53 dl/g, even more preferably 0.45 dl/g ≤ |A-B| ≤ 0.49 dl/g

In the above relational formula 1, A represents the intrinsic viscosity of the first component, and B represents the intrinsic viscosity of the second component.

For reference, FIG. 6 is a schematic diagram of a manufacturing process according to a preferred embodiment of the present invention, and the first component 10 and the second component 20 can be melted in the melting section.

Next, in the second step of the method for producing a polyester composite fiber having excellent elasticity of the present invention, the first component and the second component melted in the first step may be combined-spun to produce a polyester composite fiber.

At this time, in the second step, the first component and the second component may be combined in a weight ratio of 30:70 to 70:30, and the spinning temperature is preferably 250 to 300°C, more preferably It may be 260 ~ 280 ℃, the spinning speed may be 3000 ~ 4500mpm.

On the other hand, the complex spinning of the second step can be performed through various types of detention, and preferably, the cross-sectional shape is achieved through side-by-side detention in a peanut-shaped cross-section or side-by-side detention in a circular cross-section. The cross-sectional shape may be a peanut-like side-by-side or a circular side-by-side composite fiber.

Further, the cooling and solidification process (40 in FIG. 6) may be performed for the composite fiber composite spun after the second step at a temperature of 15 to 25°C and a speed of 25 to 50 mpm. If it is out of the above range, it is difficult to control the cross-sectional shape of the composite fiber, and there is a problem in that the uniformity cannot be improved.

Next, an emulsion can be supplied for smooth spinning and winding. For the oil supply, an oil spray method or an oil roller method may be used in a guide (50 in FIG. 6) installed with a guide in the solidified area, and any of the two methods may be used.

In addition, after the oil agent is supplied, a partial stretching process or a stretching process may be further included. Fibers having higher strength can be obtained by improving fiber orientation through partial stretching or stretching.

Specifically, it will be described in detail below based on the two rollers of FIG. 6 (the first godet roller 60 and the second godet roller 70).

The partial stretching may be performed under conditions of a first godet roller speed of 2,000 to 3,500 mpm and a second godet roller speed of 2,000 to 3,500 mpm.

In addition, in the case of the stretching process, specifically, the speed of the first godet roller may be 1,000 to 2,500 mpm, and preferably 1,400 to 2,000 mpm. If the speed of the primary godet roller is less than 1,000mpm, there is a problem in that the physical properties are deteriorated according to the aging change of the yarn, and the spinning tension is low due to the low primary godet roller speed, thereby causing a lot of thread trimming. If the speed of the primary godet roller exceeds 2,500mpm, there is a concern that a defect in dyeing may occur due to uneven stretching. The temperature of the primary godet roller may be 50 to 100°C, preferably 70 to 80°C.

Next, the secondary godet roller speed may be 3,000 to 5,000 mpm, and in consideration of spinning operability, the secondary godet roller speed may preferably be 3,500 to 4,500 mpm. If the speed of the secondary godet roller is less than 3,000mpm, the physical properties of the spun yarn, especially the stiffness and elongation, are lowered and the productivity is lowered.If it exceeds 5,000mpm, there is a concern that yarn tremors will occur in the secondary godet roller and thread trimming may occur. There is. The temperature of the secondary godet roller may be 90 to 150°C, and preferably 110 to 130°C. If the heat setting temperature of the secondary godet roller is less than 90℃, there is a risk of changes in physical properties such as strength and elongation over time, and it is a yarn with a high shrinkage rate, which may lead to over-shrinkage during subsequent dyeing processing. If the temperature exceeds 150°C, there is a concern that stable operation may be difficult due to increased vibration in the secondary godet roller.

On the other hand, the composite fiber produced by the manufacturing method of the present invention has a full rate (%) of 80% or more, preferably 85% or more, more preferably 90%- It may be 99.9%, and the higher the full rate, the better the spinning workability.

[Equation 3]

As described above, it can be seen that the composite fiber of the present invention has excellent spinning operability despite the composite spinning of two components (the first component and the second component) having a difference in intrinsic viscosity.

In addition, the present invention provides a fabric comprising the polyester fiber having excellent elasticity of the present invention.

The term used in the present invention, the fabric is meant to include all fabrics or knitted fabrics.

First, the fabric may be a weaving fabric using a polyester composite fiber having excellent elasticity according to the present invention as 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, weave and double weave.

However, it is not limited to the substrate of the fabric structure, and the density of warp yarns in weaving is not particularly limited.

In addition, the fabric may be a knitted fabric including polyester fibers having excellent elasticity. The knitting may be performed by a weft knitting or warp knitting method, and the specific method of the weft knitting and warp knitting may be by a conventional weft knitting or warp knitting method.

The embodiments of the present invention have been described above, but these are only examples and do not limit the embodiments of the present invention, and those of ordinary skill in the field to which the embodiments of the present invention pertain are not limited to the essential characteristics of the present invention. It will be appreciated that various modifications and applications not illustrated above are possible within the range not departing from. For example, each component specifically shown in the embodiments of the present invention can be modified and implemented. And differences related to these modifications and applications should be construed as being included in the scope of the present invention defined in the appended claims.

Example 1: Preparation of polyester composite fiber

(One) As the first component, polybutylene terephthalate (PBT) containing 1.5% by weight of titanium oxide (TiO ₂ ) was prepared based on the total weight %. At this time, the first component has a melting point of 223°C and an intrinsic viscosity of 0.98 dl/g.

In addition, as a second component, polyethylene terephthalate (PET) containing 1.8% by weight of titanium oxide (TiO ₂ ) based on the total weight% was prepared. At this time, the second component has a melting point of 254°C and an intrinsic viscosity of 0.50 dl/g.

(2) The melting temperature of the first component prepared to manufacture the composite fiber was 270°C, the melting temperature of the prepared second component was 275°C, and the spinning temperature was 272°C. In this case, the first component and The discharge weight ratio of the second component was 50:50. The speed of the first godet roller for stretching was 1,700mpm, the temperature was 73℃, the speed of the second godet roller was 4,400mpm, and the temperature was 120℃, and the winding speed was 4,340mpm, resulting in a fineness of 75 denier and filament. The number is 24, and the cross-sectional shape including titanium oxide as 1.65% with respect to the total weight% is a peanut type side-by-side polyester composite fiber as shown in Table 1 was prepared.

Example 2: Preparation of polyester composite fiber

A polyester composite fiber was prepared in the same manner as in Example 1. However, unlike in Example 1, a polyester composite fiber using the first component having a melting point of 220°C and an intrinsic viscosity of 0.90 dl/g instead of the first component having a melting point of 223°C and an intrinsic viscosity of 0.98 dl/g. Was prepared.

Example 3: Preparation of polyester composite fiber

A polyester composite fiber was prepared in the same manner as in Example 1. However, unlike Example 1, a polyester composite fiber was prepared by using a discharge weight ratio of 60:40 instead of 50:50 to the second component.

Example 4: Preparation of polyester composite fiber

A polyester composite fiber was prepared in the same manner as in Example 1. However, unlike Example 1, a polyester composite fiber was prepared by using a discharge weight ratio of 40:60 instead of 50:50 to the first component and the second component.

Example 5: Preparation of polyester composite fiber

A polyester composite fiber was prepared in the same manner as in Example 1. However, unlike Example 1, a fineness of 75 denier, a number of filaments of 24, and a cross-sectional shape containing 1.65% titanium oxide based on the total weight% is not a peanut-type side-by-side polyester composite fiber, but a fineness of 40. A polyester composite fiber having a denier and a number of filaments of 24, and a cross-sectional shape of 1.65% of titanium oxide based on the total weight% was prepared as a peanut type side-by-side.

Example 6: Preparation of polyester composite fiber

A polyester composite fiber was prepared in the same manner as in Example 1. However, unlike Example 1, a fineness of 75 denier, a number of filaments of 24, and a cross-sectional shape containing 1.65% titanium oxide based on the total weight% is not a peanut-type side-by-side polyester composite fiber, but a fineness of 40. A polyester composite fiber having a denier and a number of filaments of 24, and a cross-sectional shape of 1.65% titanium oxide based on the total weight% was prepared with a circular side-by-side.

Example 7: Preparation of polyester composite fiber

A polyester composite fiber was prepared in the same manner as in Example 1. However, unlike Example 1, the melting point of 223°C, not the first component having an intrinsic viscosity of 0.98 dl/g and the melting point of 254°C, and the second component having an intrinsic viscosity of 0.5 dl/g, 1.10 A polyester composite fiber was prepared using a first component having an intrinsic viscosity of dl/g, a melting point of 254° C. and a second component having an intrinsic viscosity of 0.55 dl/g.

Example 8: Preparation of polyester composite fiber

A polyester composite fiber was prepared in the same manner as in Example 1. However, unlike Example 1, a melting point of 223° C., not a second component having a melting point of 223° C., an intrinsic viscosity of 0.98 dl/g, and a melting point of 254° C., and a melting point of 0.5 dl/g, 1.20 A polyester composite fiber was prepared using a first component having an intrinsic viscosity of dl/g, a melting point of 254°C, and a second component having an intrinsic viscosity of 0.70 dl/g.

Comparative Example 1: Preparation of polyester composite fiber

A polyester composite fiber was prepared in the same manner as in Example 1. However, unlike Example 1, a melting point of 223°C, not a first component having an intrinsic viscosity of 0.98 dl/g and a melting point of 254° C., and a second component having an intrinsic viscosity of 0.5 dl/g, 0.75 A polyester composite fiber was prepared using a first component having an intrinsic viscosity of dl/g, a melting point of 254°C, and a second component having an intrinsic viscosity of 0.5dl/g.

Comparative Example 2: Preparation of polyester composite fiber

A polyester composite fiber was prepared in the same manner as in Example 1. However, unlike Example 1, the melting point of 223°C, not the second component having a melting point of 223°C, an intrinsic viscosity of 0.98 dl/g, and a melting point of 254°C, and an intrinsic viscosity of 0.5 dl/g, 0.85 A polyester composite fiber was prepared using a first component having an intrinsic viscosity of dl/g, a melting point of 254°C, and a second component having an intrinsic viscosity of 0.65 dl/g.

Comparative Example 3: Preparation of polyester composite fiber

A polyester composite fiber was prepared in the same manner as in Example 1. However, unlike Example 1, a melting point of 223° C., not a second component having a melting point of 223° C., an intrinsic viscosity of 0.98 dl/g, and a melting point of 254° C., and a melting point of 0.5 dl/g, 1.35 A polyester composite fiber was prepared using a first component having an intrinsic viscosity of dl/g, a melting point of 254°C, and a second component having an intrinsic viscosity of 0.35 dl/g.

Comparative Example 4: Preparation of polyester composite fiber

A polyester composite fiber was prepared in the same manner as in Example 1. However, unlike Example 1, a melting point of 223°C, not the first component having an intrinsic viscosity of 0.98 dl/g and a melting point of 254°C, and the second component having an intrinsic viscosity of 0.5 dl/g, 1.60 A polyester composite fiber was prepared using a first component having an intrinsic viscosity of dl/g, a melting point of 254°C, and a second component having an intrinsic viscosity of 0.75 dl/g.

Experimental Example 1: Measurement of physical properties of polyester composite fiber

Each of the polyester conjugated fibers prepared in Examples 1 to 8 and Comparative Examples 1 to 4 was subjected to the following experiment, and the results measured through it are shown in Tables 1 to 3 below.

1. Measurement of strength and elongation

It was measured by applying a speed of 200 cm/min and a gripping distance of 50 cm using an automatic tensile tester (manufactured by Textechno). Strength and elongation are the value (g/de) obtained by dividing the load applied to the composite fiber by the denier when it is stretched until it is cut by applying a certain force to the strength, and the value (%) representing the initial length to the elongated length as a percentage. Defined.

2. Measurement of radiation operability

In order to evaluate the spinning operability, it was measured through the full pipe rate (%), and the full pipe rate of the polyester composite fibers without cutting when spun with an 8 kg drum of polyester composite fibers prepared in Examples and Comparative Examples respectively As a yield, it was measured by Equation 3 below.

[Equation 3]

3. Measurement of Leesona shrinkage (%) and residual shrinkage (%)

The lysona shrinkage rate and the residual shrinkage rate were measured by the following equations 1 and 2, respectively.

[Equation 1]

In Equation 1, the lysona shrinkage rate is measured by applying a load of 20.5 g to the composite fiber to measure the initial length (L ₀ ), and immersing it in hot water at 82±3° C. for 10 minutes while applying a load of 20.5 g. After drying for 3 minutes, the length (L ₁ ) is measured after treatment.

[Equation 2]

In Equation 2, the residual shrinkage is measured by applying a load of 1.5 g to the composite fiber to measure the initial length (L ₀ ), and immersing it in hot water at 82±3° C. for 10 minutes while applying a load of 1.5 g. After drying for a minute, the length (L ₁ ) is measured after treatment.

As can be seen in Table 1, the polyester composite fibers prepared in Examples 1 to 4 were excellent in both the full rate, lysona shrinkage rate, and residual shrinkage rate at the same time, so it was confirmed that both spinning operation and elasticity were excellent. In addition, compared to the polyester composite fibers prepared in Examples 1 to 2, it can be seen that the full rate of the polyester composite fibers prepared in Examples 3 to 4 is slightly lowered, which is the result of the first component and the second component. It was confirmed that the weight ratio of 50:50 showed the best spinning operability.

Next, looking at Table 2, in the case of Example 5, compared to Example 1, due to the different fineness of the composite fiber, it was confirmed that the elongation was significantly lowered.

In addition, in the case of Example 6, compared to Example 1, not only the fineness of the conjugate fiber was different, but due to the circular cross-sectional shape, it was confirmed that the strength was slightly lowered, and the lysona shrinkage rate and the residual shrinkage rate were lowered. .

In addition, in the case of Examples 7 and 8, the lysona contraction rate and the residual contraction rate were expressed at a satisfactory level, but due to the high difference in intrinsic viscosity between the first component and the second component, the full pipe was slightly lower than that of Examples 1 to 4. It was confirmed that the rate was shown.

Next, looking at Table 3, it was confirmed that, as in Comparative Examples 1 and 2, when the difference in intrinsic viscosity of the two components is lower than the target intrinsic viscosity difference 0.30 ~ 0.80 dl/g, remarkably low elasticity is expressed.

On the other hand, as in Comparative Example 3, if the difference in the intrinsic viscosity of the first component and the second component is higher than the target intrinsic viscosity difference 0.30 ~ 0.80 dl/g, the level of howitzer generated during complex spinning is severe and the spinning workability becomes considerably poor. It was confirmed that the rate was reduced to the level of 30%.

On the other hand, as in Comparative Example 4, if the difference in intrinsic viscosity between the first component and the second component is higher than the target intrinsic viscosity difference 0.30 ~ 0.80 dl/g, the level of howitzer occurs during complex spinning is severe, and the spinning operability is considerably poor. It can be seen that the full coverage is reduced to 40% level, and when the intrinsic viscosity of the second component is high, the elasticity properties are also reduced.

A simple modification or change of the present invention can be easily implemented by those of ordinary skill in the art, and all such modifications or changes can be considered to be included in the scope of the present invention.

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 and excellent touch without gloss and a method for manufacturing the same. .

Claims (9)

1. In the polyester composite fiber produced by composite spinning of the first component and the second component,

   The composite fiber is a side-by-side composite fiber having an intrinsic viscosity of 0.60 to 0.80 dl/g,

   Polyester composite fiber having excellent elasticity, characterized in that the lysona shrinkage (%) measured by Equation 1 below is 15 to 30%.

   [Equation 1]

   

   In Equation 1, the lysona shrinkage rate is measured by applying a load of 20.5 g to the composite fiber to measure the initial length (L ₀ ), and immersing it in hot water at 82°C for 10 minutes while applying a load of 20.5 g for 3 minutes. After drying, the length (L ₁ ) is measured after treatment.
2. The method of claim 1,

   The composite fiber is a polyester composite fiber having excellent elasticity, characterized in that the residual shrinkage (%) measured by Equation 2 below is 40 to 70%.

   [Equation 2]

   

   In Equation 2, the residual shrinkage is measured by applying a load of 1.5 g to the composite fiber to measure the initial length (L ₀ ), immersing it in hot water at 82° C. for 10 minutes and drying for 3 minutes while applying a load of 1.5 g. After treatment, the length (L ₁ ) is measured.
3. The method of claim 1,

   The first component contains polybutelene terephthalate (PBT),

   The second component is a polyester composite fiber having excellent elasticity, characterized in that it contains polyethylene terephthalate (PET).
4. The method of claim 3,

   The composite fiber is a polyester composite fiber having excellent elasticity, characterized in that it satisfies the following relational formula 1.

   [Relationship 1]

   0.30 dl/g ≤ |A-B| ≤ 0.80 dl/g

   In the above relational formula 1, A represents the intrinsic viscosity of the first component, and B represents the intrinsic viscosity of the second component.
5. The method of claim 1,

   Polyester composite fiber excellent in elasticity, characterized in that the cross-sectional shape of the composite fiber is a peanut type.
6. The method of claim 1,

   The first component and the second component are each independently, a polyester composite fiber excellent in elasticity, characterized in that it contains 1.0 to 3.0% by weight of a matting agent based on the total weight%.
7. The method of claim 6,

   The matting agent is a polyester composite fiber having excellent elasticity, characterized in that it contains at least one selected from titanium oxide (TiO ₂ ), zinc oxide (ZnO), silicon oxide (SiO ₂ ) and barium sulfate (BaSO ₄ ).
8. A first step of melting the first component and the second component, respectively; And

   A second step of producing a polyester composite fiber by composite spinning the melted first component and the second component; Including,

   The prepared composite fiber is a side-by-side composite fiber having an intrinsic viscosity of 0.60 ~ 0.80 dl/g,

   The prepared composite fiber is a method of producing a polyester composite fiber having excellent elasticity, characterized in that the lysona shrinkage (%) measured by the following equation 1 is 15 to 30%.

   [Equation 1]

   

   In Equation 1, the lysona shrinkage rate is measured by applying a load of 20.5 g to the composite fiber to measure the initial length (L ₀ ), and immersing it in hot water at 82°C for 10 minutes while applying a load of 20.5 g for 3 minutes. After drying, the length (L ₁ ) is measured after treatment.
9. The method of claim 8,

   The composite fiber is a method for producing a polyester composite fiber having excellent elasticity, characterized in that the full rate (%) measured by Equation 3 below is 80% or more.

   [Equation 3]

   

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