JP2022536095A - Polyester composite fiber with excellent stretchability and method for producing the same - Google Patents

Abstract

TECHNICAL FIELD The present invention relates to a polyester conjugate fiber having excellent stretchability and a method for producing the same, and more particularly, to a 0.60 to 0.80 dl / g intrinsic polyester fiber produced by conjugate spinning the first component and the second component. A side-by-side conjugated fiber having a viscosity and a reasona shrinkage rate (%) of 15 to 30%, which not only has further improved stretchability, but also does not generate gloss and has excellent touch feeling, and its production Regarding the method. [Selection drawing] Fig. 2

Description

TECHNICAL FIELD The present invention relates to a polyester conjugated fiber having excellent stretchability and a method for producing the same, and more particularly, to a polyester conjugated fiber having improved elasticity, no glossiness, and excellent touch feeling, and its production. Regarding the method.

Recently, as the demand for fabrics requiring high elasticity increases, the market demand for spandex is increasing. Spandex is a type of polyurethane fiber that is melt-spun by polymerizing polyether and methylenediphenylisocyanate. Spandex is lighter than rubber cord and has higher aging resistance than conventional rubber thread. have.

In addition, spandex is a rare fiber having elasticity similar to rubber, and has very high tensile strength and/or ultimate strength, so that the yarn does not break easily and the original length can be maintained. It is elastic enough to stretch 5 to 8 times its length.

Also, spandex does not stain with sweat, oil, or cosmetics, and withstands washing well. In addition, spandex can be spun into finer threads than rubber and has good dyeability.

On the other hand, spandex has excellent elasticity, is comfortable for activities, and has excellent durability, perspiration, and drying properties, and is widely used for various purposes such as underwear, lining, and outerwear. In addition, spandex has the advantage of giving a comfortable feeling due to its high perspiration and drying ability.

However, spandex is expensive, weak against heat, generates static electricity, has poor alkali resistance, cannot be used as spandex yarn alone, and requires a separate covering process. Therefore, there is no choice but to obtain a relatively thick fabric, which limits the demands of the market for thinner and thinner fabrics.

In order to overcome the shortcomings of spandex, a stretchable latent crimp yarn has been suggested. Latent crimped fibers are obtained by conjugate spinning two types of polymers with different heat shrinkage properties in a side-by-side type or a sheath-core type, and then applying heat in the spinning process or the drawing process. It is a fiber that physically creates a coil pattern due to the difference in heat shrinkage and gives a high degree of elasticity based on a principle similar to that of a spring. In terms of stretchability, it is not as good as existing spandex fibers, but it has excellent alkali resistance and shape stability, which are the disadvantages of spandex mentioned above, and it uses a lot of latent crimp fibers that are easy to dye and post-processing. there is

On the other hand, as a latent crimped fiber, a fiber obtained by composite spinning polyester resins with different viscosities has been proposed in the past, but the fiber produced by this method is insufficient to obtain the desired stretchability. There was a problem that

In addition, a composite fiber in which polytetramethylene terephthalate (PTT) is included in latent crimped yarn has been proposed for high elasticity, but polytetramethylene terephthalate is expensive as a monomer required during polymerization. Therefore, there is a problem that the manufacturing cost of the composite fiber itself increases due to the increase in raw material cost.

The present invention has been devised to solve the above-described problems, and is a polyester composite that does not generate gloss, has excellent touch feeling, and has excellent elasticity. SUMMARY OF THE INVENTION It is an object to provide fibers and methods for their production.

In order to solve the above-mentioned problems, the polyester conjugated fiber having excellent stretchability of the present invention may be a polyester conjugated fiber produced by conjugate-spinning the first component and the second component.

In one preferred embodiment of the invention, the first component can comprise polybutylene terephthalate (PBT).

In one preferred embodiment of the invention, the second component can comprise polyethylene terephthalate (PET).

In a preferred embodiment of the present invention, the polyester conjugate fiber of the present invention can satisfy the following relational expression 1.

[Relationship 1]
0.30dl/g≤|AB|≤0.80dl/g

In relational expression 1, A indicates the intrinsic viscosity of the first component, and B indicates the intrinsic viscosity of the second component.

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

In one preferred embodiment of the present invention, the melting point of the first component may be 200-250°C.

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

In one preferred embodiment of the present invention, the melting point of the second component may be 230-270°C.

In one preferred embodiment of the present invention, the first component may further contain a quencher.

In one preferred embodiment of the present invention, the second component can further include a quencher.

In one preferred embodiment of the present invention, the quencher comprises one or more selected from titanium oxide ( _TiO2 ), zinc oxide (ZnO), silicon oxide ( _SiO2 ) and barium sulfate ( _BaSO4 ). can be done.

In one preferred embodiment of the present invention, the first component may contain 1.0-3.0% by weight of the quencher based on the total weight.

In one preferred embodiment of the present invention, the second component may comprise 1.0-3.0 wt% of the quencher with respect to the total wt%.

In one preferred embodiment of the present invention, the weight ratio of the first component to the second component may be from 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 peanut-shaped side-by-side or circular side-by-side.

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

In a preferred embodiment of the present invention, the polyester conjugate fiber of the present invention may contain 1.0 to 3.0 wt% of the quencher based on the total wt%.

In one preferred embodiment of the present invention, the polyester bicomponent fibers of the present invention may have a fineness of 20-180 denier and a filament count of 12-96.

In one preferred embodiment of the present invention, the polyester conjugate fiber of the present invention may have a recital shrinkage (%) of 15-30% as measured by Equation 1 below.

In Equation 1 above, the reasona shrinkage is calculated by measuring the initial length (L ₀ ) of the bicomponent fiber with a load of 20.5 g applied, and applying a load of 20.5 g to 10 in hot water at 82°C. After soaking for 3 minutes and drying for 3 minutes, the post-treatment length (L ₁ ) is measured.

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

In Equation 2, the residual shrinkage is measured by applying a load of 1.5 g to the composite fiber, measuring the initial length (L ₀ ), and applying a load of 1.5 g. After soaking for 3 minutes and drying for 3 minutes, the post-treatment length (L ₁ ) is measured.

On the other hand, the method for producing a polyester conjugated fiber having excellent stretchability according to the present invention includes the first step of melting the first component and the second component, respectively, and the conjugate spinning of the melted first component and the second component to make the polyester conjugated fiber. A second stage of producing fibers can be included.

In one preferred embodiment of the present invention, the bicomponent fibers produced may be side-by-side bicomponent fibers having an intrinsic viscosity of 0.60-0.80 dl/g.

In one preferred embodiment of the present invention, the bicomponent fiber produced may have a % reasona shrinkage of 15-30% as measured by Equation 1 below.

In Equation 1 above, the reasona shrinkage is calculated by measuring the initial length (L ₀ ) of the bicomponent fiber with a load of 20.5 g applied, and applying a load of 20.5 g to 10 in hot water at 82°C. After soaking for 3 minutes and drying for 3 minutes, the post-treatment length (L ₁ ) is measured.

In one preferred embodiment of the invention, the first component can include polybutylene terephthalate (PBT) and a quencher.

In one preferred embodiment of the invention, the second component can include polyethylene terephthalate (PET) and a quencher.

In a preferred embodiment of the present invention, the method for producing a polyester conjugate fiber with excellent stretchability satisfies the following relational expression 1.

[Relationship 1]
0.30dl/g≤|AB|≤0.80dl/g

In relational expression 1, A indicates the intrinsic viscosity of the first component, and B indicates the intrinsic viscosity of the second component.

In a preferred embodiment of the present invention, the polyester conjugated fiber produced by the method for producing a polyester conjugated fiber with excellent stretchability of the present invention has a full winding ratio (%) of 80% or more as measured by Equation 3 below. It can be.

Furthermore, the fabric of the present invention contains the above-described polyester conjugate fiber having excellent stretchability.

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

The term "fiber" as used in the present invention means "yarn" and generally refers to various types of yarns and fibers.

The term "composite fiber" used in the present invention is used to include raw yarn itself produced by conjugate spinning, or a fiber obtained by drawing and/or partially drawing the raw yarn.

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 drawing process.

The highly stretchable polyester conjugate fiber of the present invention does not generate gloss and has excellent touch feeling.

In addition, the highly stretchable polyester conjugate fiber of the present invention can be applied to various products that require the use of highly stretchable and lustrous fibers. Specifically, the highly stretchable polyester conjugate fiber of the present invention is suitable for use as a raw yarn for woven or knitted fabrics that require stretchability, and at the same time, the fabric itself containing it does not generate gloss, In addition, it has good touch feeling and excellent stretchability.

FIG. 1 is a schematic diagram of a side-by-side composite fiber having a peanut-shaped cross section according to a preferred embodiment of the present invention.

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

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.

FIG. 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.

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

FIG. 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 skilled in the art can easily implement the present invention. This invention may be embodied in many different forms and is not limited to the embodiments set forth herein. In order to clearly describe the present invention, parts not related to the description are omitted in the drawings, and the same reference numerals are given to the same or similar components throughout the specification.

The stretchable polyester conjugate fiber of the present invention is produced by conjugate spinning the first component and the second component.

The first component of the highly stretchable polyester conjugate fiber of the present invention may contain polybutylene terephthalate (PBT). As an example, polybutylene terephthalate (PBT) can be made by polymerizing butanol and terephthalic acid.

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

On the other hand, the polyester conjugate fiber of the present invention having excellent stretchability can satisfy the following relational expression 1. there can be problems.

[Relational expression 1]
0.30 dl/g≦|AB|≦0.80 dl/g, preferably 0.4 dl/g≦|AB|≦0.70 dl/g, more preferably 0.4 dl/g≦| AB|≦0.60 dl/g, more preferably 0.45 dl/g≦|AB|≦0.53 dl/g, most preferably 0.45 dl/g≦|AB|≦0 .49dl/g

In relational expression 1, A indicates the intrinsic viscosity of the first component, and B indicates the intrinsic viscosity of the second component.

Furthermore, 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, more preferably 0.95 to 1.05 dl/g, and if the intrinsic viscosity is less than 0.90 dl/g, there is a problem that the desired stretchability cannot be achieved. On the other hand, if it exceeds 1.30 dl/g, the twisting phenomenon of the conjugate fiber produced during conjugate spinning increases remarkably, resulting in poor spinning operability.

In addition, the second component of the present invention has an intrinsic viscosity (I.V) 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, more preferably 0.48 to 0.53 dl/g, if the intrinsic viscosity is less than 0.40 dl/g, the twisted yarn of the conjugate fiber produced during conjugate spinning There may be a problem that the phenomenon is remarkably increased, resulting in poor spinning operability.

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. There may be a problem that the crystallinity of the first component is lowered and the strength of the manufactured composite fiber is lowered. There may be a problem that the strength of the conjugate fiber produced by this method is reduced.

Also, 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. There may be a problem that the crystallinity of the second component is lowered and the strength of the manufactured composite fiber is lowered. There may be a problem that the strength of the conjugate fiber produced by this method is reduced.

Additionally, the first component of the present invention can further include a quencher. At this time, the quencher may include one or more 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 can have an anatase, rutile, or brookite crystal form, and titanium oxide can contain the above crystal forms singly or in combination. , refractive index, light reflection and absorption characteristics, they can be appropriately classified according to the purpose and application. In addition, titanium oxide that has undergone surface treatment in order to control performance such as dispersibility in the polymer and light reflection performance can be included.

In addition, the first component of the present invention contains 1.0 to 3.0% by weight, preferably 1.2 to 2.5% by weight, more preferably 1.5 to 3.0% by weight of the quencher with respect to the total weight%. 2.0% by weight of the quenching agent, if less than 1.0% by weight of the quenching agent, the effect of suppressing luster is reduced, and the touch feeling of the fabric produced using the composite fiber of the present invention is reduced. If it exceeds 3.0% by weight, the phenomenon of aggregation of the quenching agent in the first component increases, causing yarn breakage during spinning, resulting in poor spinning operability. The second component of the present invention contains 1.0 to 3.0% by weight of the quenching agent, preferably 1.2 to 2.5% by weight, more preferably 1.5 to 3.0% by weight, based on the total weight%. 2.0% by weight of the quenching agent, if less than 1.0% by weight of the quenching agent, the effect of suppressing luster is reduced, and the touch feeling of the fabric produced using the composite fiber of the present invention is reduced. If it exceeds 3.0% by weight, the phenomenon of aggregation of the quenching agent in the second component increases, causing yarn breakage during spinning, resulting in poor spinning operability.

On the other hand, the weight ratio of the first component and the second component of the present invention is 30:70 to 70:30, preferably 35:65 to 65:35, more preferably 45:55 to 55:45. If 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 will be unbalanced, resulting in severe twisting and spinning operation. There may be a problem that the elasticity becomes poor and the stretchability of the composite fiber is also reduced.

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

Specifically, FIG. 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, and FIG. 2 is a schematic diagram of a peanut-shaped cross-sectional shape according to a preferred embodiment of the present invention. 1 and 2, which are SEM photographs of a side-by-side composite fiber having a peanut-shaped cross section and a shape in which the first component 101 and the second component 102 are included in the composite fiber. be able to. 3 is a schematic diagram of a side-by-side composite fiber having a circular cross-section according to a preferred embodiment of the present invention, and FIG. 4 is a side-by-side composite fiber having a circular cross-section according to a preferred embodiment of the present invention. Referring to FIGS. 3 and 4, which are SEM photographs of the composite fiber, it can be confirmed that the cross-sectional shape is circular and the first component 112 and the second component 113 are included in the composite fiber. can.

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

Further, the composite fiber of the present invention has a fineness of 20 to 180 denier, preferably 30 to 170 denier, more preferably 50 to 100 denier, and a filament number of 12 to 96, preferably 20 to 60. The number of filaments is not particularly limited to this, and can be changed depending on the purpose.

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

In Equation 1 above, the reasona shrinkage is calculated by measuring the initial length (L ₀ ) of the bicomponent fiber with a load of 20.5 g applied, and applying a load of 20.5 g to 10 in hot water at 82°C. After soaking for 3 minutes and drying for 3 minutes, the post-treatment length (L ₁ ) is measured.

Specifically, the Leesona shrinkage was obtained by stretching the composite fiber at a primary godet roller speed of 1,700 mpm at a temperature of 73°C and a secondary godet roller speed of 4,400 mpm at a temperature of 120°C. It may be the percentage of the length of shrinkage to the length of the original state after applying a load of 20.5 g to the drawn yarn and heat-treating it in water at 82±3° C. for 10 minutes.

The conjugate fiber of the present invention may also have a residual shrinkage (%) of 40-70%, preferably 47-63%, as measured by Equation 2 below.

In Equation 2, the residual shrinkage is measured by applying a load of 1.5 g to the composite fiber, measuring the initial length (L ₀ ), and applying a load of 1.5 g. After soaking for 3 minutes and drying for 3 minutes, the post-treatment length (L ₁ ) is measured.

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

The conjugate fiber of the present invention can exhibit the most excellent stretchability when satisfying a reasona shrinkage of 15 to 30% and a residual shrinkage of 40 to 70%, and if the reasona shrinkage is less than 15%. If the residual shrinkage rate is less than 40%, there may be a problem of reduced stretchability. As a result, the filament entanglement phenomenon is severe, so that there is a problem that the process workability is remarkably deteriorated when fabrics and knitted fabrics are manufactured.

Meanwhile, the method for producing a polyester composite fiber having excellent stretchability according to 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. The conjugate fiber of the present invention can be manufactured through the second step S11 of spinning, and additionally, after spinning, it can undergo a cooling solidification step S12, an oil supplying step S13, and a heat setting and stretching step S14.

First, in the first step of the method for producing a polyester composite fiber having excellent stretchability according to the present invention, the first component and the second component can be melted. At this time, the first component may include polybutylene terephthalate (PBT) and may further include a quencher. Also, the second component can include polyethylene terephthalate (PET) and can further include a quencher.

The conjugate fibers produced may also be side-by-side conjugate fibers having an intrinsic viscosity of 0.60-0.80 dl/g.

The bicomponent fiber produced may also have a percent reasoneral shrinkage of 15-30% as measured by Equation 1 below.

In Equation 1 above, the reasona shrinkage is calculated by measuring the initial length (L ₀ ) of the bicomponent fiber with a load of 20.5 g applied, and applying a load of 20.5 g to 10 in hot water at 82°C. After soaking for 3 minutes and drying for 3 minutes, the post-treatment length (L ₁ ) is measured.

Moreover, the following relational expression 1 can be satisfied, and if the range described in the following relational expression 1 is deviated, there may be a problem that the stretchability of the manufactured conjugate fiber becomes weak.

[Relationship 1]
0.30 dl/g≦|AB|≦0.80 dl/g, preferably 0.4 dl/g≦|AB|≦0.70 dl/g, more preferably 0.4 dl/g≦| AB|≦0.60 dl/g, more preferably 0.45 dl/g≦|AB|≦0.53 dl/g, most preferably 0.45 dl/g≦|AB|≦0 .49dl/g

In relational expression 1, A indicates the intrinsic viscosity of the first component, and B indicates 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, in which 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 conjugated fiber having excellent elasticity according to the present invention, the first component and the second component melted in the first step are conjugate-spun to produce a polyester conjugated fiber. can.

At this time, the second stage conjugate spinning may be conjugate spinning of the first component and the second component at a weight ratio of 30:70 to 70:30, and the spinning temperature is preferably 250 to 300 ° C., more preferably , 260-280° C., and the spinning speed may be 3000-4500 mpm.

On the other hand, the conjugate spinning in the second step can be performed through spinnerets of various shapes, preferably, through a side-by-side spinneret with a peanut-shaped cross section or a side-by-side spinneret with a circular cross-section. Composite fibers can be produced that are side-by-side of

Further, after the second stage, the conjugate fiber can be cooled and solidified (40 in FIG. 6) at a cooling air 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 conjugate fiber and the uniformity cannot be improved.

Oil can then be supplied for smooth spinning and winding. As for the oil supply, a guide (50 in FIG. 6) installed in the solidified area can use an oil injection method or an oil roller method, and any of the two methods may be used.

In addition, a partial stretching process or a stretching process may be further included after the supply of the oil solution. Fiber orientation can be improved through a partial drawing process or a drawing process to obtain fibers with higher strength.

More specifically, the two rollers (primary godet roller 60 and secondary godet roller 70) of FIG. 6 will be described in detail below.

The partial stretching may be performed at a primary godet roller speed of 2,000-3,500 mpm and a secondary godet roller speed of 2,000-3,500 mpm.

Further, in the case of the stretching process, specifically, the primary godet roller speed may be 1,000 to 2,500 mpm, preferably 1,400 to 2,000 mpm. If the speed of the primary godet roller is less than 1,000 mpm, there is a problem that the physical properties of the raw yarn deteriorate with time. can occur a lot. If the primary godet roller speed exceeds 2,500 mpm, uneven stretching may result in poor dyeing. The temperature of the primary godet roller may be 50-100°C, preferably 70-80°C.

Next, the secondary godet roller speed may range from 3,000 to 5,000 mpm. may be If the speed of the secondary godet roller is less than 3,000 mpm, the physical properties of the spun yarn, especially the strength and elongation, are lowered, resulting in a decrease in productivity. , there is a risk that the raw yarn will vibrate severely at the secondary godet roller, causing the yarn to be cut. The temperature of the secondary godet roller may be 90-150°C, preferably 110-130°C. If the heat setting temperature of the secondary godet roller is less than 90°C, physical properties such as strength and elongation may change over time. When the temperature exceeds 150°C, the second godet roller causes the yarn to vibrate greatly, making stable operation difficult.

On the other hand, the conjugate fiber produced by the production method of the present invention has a full winding rate (%) of 80% or more, preferably 85% or more, more preferably 85% or more, as measured by Equation 3 below. , 90% to 99.9%, and the higher the full winding rate, the better the spinning runnability.

Thus, it can be seen that the conjugate fiber of the present invention is excellent in spinning operability despite the conjugate spinning of two components (the first component and the second component) having different intrinsic viscosities.

The present invention also provides a fabric containing the highly stretchable polyester fiber of the present invention.

The term "fabric" used in the present invention is meant to include all woven fabrics and knitted fabrics.

First, the fabric may be a fabric obtained by weaving the highly stretchable polyester composite fiber according to the present invention using at least one of warp and weft.

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

However, it is not limited to the description of the fabric structure, and there is no particular limitation in the case of the weft density in weaving.

Also, the fabric may be a knitted fabric containing polyester fibers having excellent stretchability. The knitting can be performed by a method of weft knitting or warp knitting, and the specific method of the weft knitting and warp knitting can be a normal knitting method of weft knitting or warp knitting.

Although the embodiments of the present invention have been described above, they are merely examples and are not intended to limit the embodiments of the present invention. Those skilled in the art will appreciate that various modifications and applications not exemplified above are possible without departing from the essential characteristics of the present invention. For example, each component specifically shown in the embodiment of the present invention can be modified and implemented. All such variations and differences in application should be construed as included within the scope of the present invention as defined in the appended claims.

<Example 1: Production of polyester composite fiber>

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

As a second component, polyethylene terephthalate (PET) containing 1.8% by weight of titanium oxide (TiO ₂ ) with respect to 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) In order to produce a conjugate fiber, the melting temperature of the prepared first component is set to 270°C, the melting temperature of the prepared second component is set to 275°C, and the spinning temperature is set to 272°C. The discharge weight ratio of the first component and the second component was set to 50:50. The speed of the primary godet roller for stretching was 1,700 mpm, the temperature was 73°C, the speed of the secondary godet roller was 4,400 mpm, the temperature was 120°C, and the winding speed was A polyester composite as shown in Table 1 below, which is wound at 4,340 mpm, has a fineness of 75 denier, has a filament count of 24, and has a peanut-shaped side-by-side cross-sectional shape containing 1.65% of titanium oxide with respect to the total weight%. fiber was produced.

<Example 2: Production of polyester composite fiber>

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

<Example 3: Production of polyester composite fiber>

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

<Example 4: Production of polyester composite fiber>

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

<Example 5: Production of polyester composite fiber>

A polyester composite fiber was produced in the same manner as in Example 1. However, unlike Example 1, it is not a polyester composite fiber having a fineness of 75 denier, a filament number of 24, and a peanut-shaped side-by-side cross-sectional shape containing 1.65% of titanium oxide with respect to the total weight%, A polyester conjugate fiber having a fineness of 40 denier, a filament number of 24, and a peanut-shaped side-by-side cross-sectional shape containing 1.65% of titanium oxide based on the total weight % was produced.

<Example 6: Production of polyester composite fiber>

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

<Example 7: Production of polyester composite fiber>

A polyester composite fiber was produced in the same manner as in Example 1. However, unlike Example 1, the 223 A polyester bicomponent fiber was produced using a first component with a melting point of 1.10 dl/g and a second component with a melting point of 254°C and an intrinsic viscosity of 0.55 dl/g.

<Example 8: Production of polyester composite fiber>

A polyester composite fiber was produced in the same manner as in Example 1. However, unlike Example 1, the 223 A polyester bicomponent fiber was produced using a first component with a melting point of 1.20 dl/g and a second component with a melting point of 254°C and an intrinsic viscosity of 0.70 dl/g.

<Comparative Example 1: Production of polyester composite fiber>

A polyester composite fiber was produced in the same manner as in Example 1. However, unlike Example 1, the 223 A polyester bicomponent fiber was produced using a first component with a melting point of 0.75 dl/g and a second component with a melting point of 254°C and an intrinsic viscosity of 0.5 dl/g.

<Comparative Example 2: Production of polyester composite fiber>

A polyester composite fiber was produced in the same manner as in Example 1. However, unlike Example 1, the 223 A polyester bicomponent fiber was produced using a first component with a melting point of 0.85 dl/g and a second component with a melting point of 254°C and an intrinsic viscosity of 0.65 dl/g.

<Comparative Example 3: Production of polyester composite fiber>

A polyester composite fiber was produced in the same manner as in Example 1. However, unlike Example 1, the 223 A polyester bicomponent fiber was produced using a first component with a melting point of 1.35 dl/g and a second component with a melting point of 254°C and an intrinsic viscosity of 0.35 dl/g.

<Comparative Example 4: Production of polyester composite fiber>

A polyester composite fiber was produced in the same manner as in Example 1. However, unlike Example 1, the 223 A polyester bicomponent fiber was produced using a first component with a melting point of 1.60 dl/g and a second component with a melting point of 254°C and an intrinsic viscosity of 0.75 dl/g.

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

The polyester conjugate fibers prepared in Examples 1 to 8 and Comparative Examples 1 to 4 were subjected to the experiments described below, and the results measured through the experiments are shown in Tables 1 to 3 below.

<1. Measurement of strength and elongation>

It was measured using an automatic tensile tester (Texttechno) applying a speed of 200 cm/min and a paper break distance of 50 cm. Strength and elongation are the value (g/de) obtained by dividing the load applied by the denier when the conjugate fiber is stretched until it breaks by applying a certain force, and the initial length to the stretched length is the strength. The percentage value (%) was defined as elongation.

<2. Measurement of Spinning Runnability>

In order to evaluate the spinning operability, the full winding ratio (%) was measured, and the full winding ratio is the number of yarns that are not cut when the polyester composite fiber 8 kg drum produced in Examples and Comparative Examples is fully wound and spun. Yield of polyester bicomponent fiber, measured by Equation 3 below.

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

Reasoner shrinkage and residual shrinkage were measured by Equations 1 and 2 below, respectively.

In Equation 1, the reasona shrinkage is measured by applying a load of 20.5 g to the composite fiber, measuring the initial length (L ₀ ), and applying a load of 20.5 g. for 10 minutes, and after drying for 3 minutes, the post-treatment length (L ₁ ) is measured.

In Equation 2, the residual shrinkage is obtained by measuring the initial length (L ₀ ) by applying a load of 1.5 g to the composite fiber, for 10 minutes, and after drying for 3 minutes, the post-treatment length (L ₁ ) is measured.

As can be seen from Table 1, the polyester conjugate fibers produced in Examples 1 to 4 are excellent in full winding rate, reasoner shrinkage rate, and residual shrinkage rate at the same time, and thus are excellent in spinning runnability and elasticity. was able to confirm. In addition, compared to the polyester conjugate fibers of Examples 1 and 2, the polyester conjugate fibers of Examples 3 and 4 had a slightly lower winding rate. It was confirmed that the best spinning operability was obtained when the weight ratio of the two components was 50:50.

Next, referring to Table 2, in the case of Example 5, compared to Example 1, it can be confirmed that the elongation is significantly decreased due to the difference in the fineness of the composite fiber. rice field.

In addition, in the case of Example 6, compared with Example 1, not only the fineness of the composite fibers was different, but also the cross-sectional shape was circular, so that the strength was slightly reduced and the reasona shrinkage rate was reduced. And it could be confirmed that the residual shrinkage rate decreased.

Further, in the case of Examples 7 and 8, the reasoner shrinkage and residual shrinkage were exhibited at satisfactory levels, but due to the large difference in intrinsic viscosity between the first component and the second component, Examples 1 to 4 It could be confirmed that the full volume ratio was slightly lower than the above.

Next, referring to Table 3, as in Comparative Examples 1 and 2, when the intrinsic viscosity difference between the two components is lower than the target intrinsic viscosity difference of 0.30 to 0.80 dl / g, it is significantly low. It was confirmed that elasticity was exhibited.

On the other hand, as in Comparative Example 3, when the intrinsic viscosity difference between the first component and the second component is higher than the target intrinsic viscosity difference of 0.30 to 0.80 dl/g, the level of twisted yarns generated during composite spinning It could be confirmed that the spinning became severe, the spinning operability was considerably poor, and the full winding ratio was lowered to the level of 30%.

On the other hand, as in Comparative Example 4, when the intrinsic viscosity difference between the first component and the second component is higher than the target intrinsic viscosity difference of 0.30 to 0.80 dl/g, the level of twisted yarns generated during composite spinning It can be seen that the stretchability is also reduced when the squeezing becomes severe, the spinning operability becomes considerably poor, the full winding rate drops to the level of 40%, and the intrinsic viscosity of the second component is high.

Simple variations and modifications of the present invention can be readily implemented by those of ordinary skill in the art, and all such variations and modifications are within the scope of the present invention.

TECHNICAL FIELD The present invention relates to a polyester conjugated fiber having excellent stretchability and a method for producing the same. More specifically, the present invention relates to a polyester conjugated fiber having improved stretchability, no glossiness, and excellent touch feeling. It relates to a manufacturing method.

Claims (9)

In the polyester conjugate fiber produced by conjugate spinning the first component and the second component,
The conjugate fiber is a side-by-side conjugate fiber having an intrinsic viscosity of 0.60 to 0.80 dl/g,
A polyester conjugate fiber with excellent stretchability, characterized by having a reasona shrinkage (%) of 15 to 30% as measured by Equation 1 below.

In Equation 1 above, the reasona shrinkage is calculated by measuring the initial length (L ₀ ) of the bicomponent fiber with a load of 20.5 g applied, and applying a load of 20.5 g to 10 in hot water at 82°C. After soaking for 3 minutes and drying for 3 minutes, the post-treatment length (L ₁ ) is measured. The polyester conjugate fiber of claim 1, wherein the conjugate fiber has a residual shrinkage rate (%) of 40-70% as measured by Equation 2 below.

In Equation 2, the residual shrinkage is measured by applying a load of 1.5 g to the composite fiber, measuring the initial length (L ₀ ), and applying a load of 1.5 g. After soaking for 3 minutes and drying for 3 minutes, the post-treatment length (L ₁ ) is measured. [Claim 2] The polyester composite fiber of claim 1, wherein the first component comprises polybutylene terephthalate (PBT), and the second component comprises polyethylene terephthalate (PET). [Claim 4] The polyester conjugate fiber of claim 3, wherein the conjugate fiber satisfies Equation 1 below.
[Relational expression 1]
0.30dl/g≤|AB|≤0.80dl/g
In relational expression 1, A indicates the intrinsic viscosity of the first component, and B indicates the intrinsic viscosity of the second component. [Claim 2] The polyester conjugate fiber of claim 1, wherein the cross-sectional shape of the conjugate fiber is peanut-shaped. The stretchable material according to claim 1, wherein the first component and the second component each independently contain a quenching agent in an amount of 1.0 to 3.0% by weight with respect to the total weight%. Excellent polyester composite fiber. 7. The quencher comprises at least one selected from titanium oxide ( _TiO2 ), zinc oxide (ZnO), silicon oxide ( _SiO2 ) and barium sulfate ( _BaSO4 ). The polyester composite fiber having excellent elasticity according to . a first step of melting the first component and the second component, respectively; and a second step of conjugate spinning the melted first component and the second component to produce a polyester conjugate fiber;
The conjugate fiber produced is a side-by-side conjugate fiber having an intrinsic viscosity of 0.60 to 0.80 dl/g,
A method for producing a polyester conjugated fiber having excellent stretchability, wherein the conjugated fiber has a reasona shrinkage (%) of 15 to 30% as measured by Equation 1 below.

In Equation 1 above, the reasona shrinkage is calculated by measuring the initial length (L ₀ ) of the bicomponent fiber with a load of 20.5 g applied, and applying a load of 20.5 g to 10 in hot water at 82°C. After soaking for 3 minutes and drying for 3 minutes, the post-treatment length (L ₁ ) is measured. [9] The method of claim 8, wherein the conjugate fiber has a full winding rate (%) of 80% or more as measured by Equation 3 below.

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