KR20060087684A - Latent crimping typed polyester two component conjugated yarn with melange effect - Google Patents

Abstract

The present invention relates to a latent crimp polyester bicomponent composite yarn having a melange effect and a method for manufacturing the same. More specifically, in a polyester bicomponent composite yarn in which two different polyester polymers are composited, One component of the two components is polyethylene terephthalate, and the other component is a cationic dye salt-copolymerized polyester in which a compound having a structure of the following general formula (I) is copolymerized.

[Wherein R ₁ and R ₂ are a methyl group, an ethyl group or a hydrogen atom and M is an alkali metal.]

In addition, the latent crimping polyester bicomponent composite yarn of the present invention has a low boiling water shrinkage ratio and thus can exhibit good elasticity when manufacturing a knitted fabric, and can be dyed with a cation dye, which is useful for producing a melangeon stretchy knitted fabric.

Latent crimping, Bicomponent composite yarn, Polyester, Melange effect, Cationic salting type, Post-process passability, Elasticity.

Description

Latent crimping typed polyester two component conjugated yarn with melange effect}             

1 is a process schematic diagram of producing a latent crimp polyester bicomponent composite yarn of the present invention by a radial direct drawing method;

2 is an electron micrograph showing a cross-sectional state of a latent crimp polyester bicomponent composite yarn (side by side type) of the present invention.

3 is an electron micrograph showing a state before heat treatment of a latent crimp polyester two-component composite yarn of the present invention.

Figure 4 is an electron micrograph showing the state after the hydrothermal treatment (100 ℃) of the latent crimp polyester 2-component composite yarn of the present invention.

※ Explanation of main parts in drawings

1,2 Extruder 3 Spinneret 4 Insulation part 5 Cooling part

6: Radiation heat treatment section 7: Oil ring device 8: 1st high roller

9: roller 2 10: winder

The present invention relates to a latent crimp polyester bicomponent composite yarn having a melange effect. Specifically, the present invention has excellent latent crimping ability, spontaneously helical structure during hot water treatment, expresses the feel and elasticity, such as natural fibers, can be dyed with cationic dyes, latent crimping with a melange effect It relates to a type polyester bicomponent composite yarn.

Synthetic fibers have a shorter history than natural fibers, and as a result of repeated technological developments, some of them have reached levels comparable to natural fibers. However, elasticity is not easily expressed by synthetic fibers and is considered to be inherent to natural fibers such as wool.

As a conventional technique for imparting elasticity to synthetic fibers, (i) a method of manufacturing bishrink composite twisted yarn by braiding, twisting and heat-fixing two kinds of synthetic fibers (yarn) having a large difference in elongation characteristics, and (ii) a knitted fabric In manufacturing, a method of mixing a polyurethane fiber having excellent elasticity in the longitudinal direction with other synthetic fibers and (i) a method of producing a composite fiber by complex spinning two kinds of polymers are known.

Among the above methods, a method for producing a biaxial composite twisted yarn is a method of imparting a potential difference in shrinkage by braiding-flamming-heat fixing two kinds of yarns having a large difference in elongation characteristics. In other words, by utilizing the difference between the strain in the flammable area and the residual strain after disintegration, the yarns in the screening and superficial yarns are relatively more deformed, leading to screening and intermingling.

The bi-shrink composite twisted yarn exhibits good elasticity due to a difference in elongation characteristics between the screening and the super yarn during heat treatment in a post-treatment process. However, this method is relatively weak because of the uneven appearance of crimping and the binding force of screening and weaving depends on air entanglement, etc. there was.

In addition, the method of manufacturing the biaxially twisted composite twisted yarn is difficult to refine the fineness because it combines two or more kinds of yarns, and the process becomes complicated and the manufacturing cost increases because the two or more kinds of yarns already produced must be dismantled and spun together. there was.

On the other hand, the method of mixing a polyurethane fiber and other synthetic fibers when manufacturing a knitted fabric has a disadvantage that is difficult to process because it is different from the physical and chemical properties of the polyurethane fiber. For example, polyester fibers are dyed with disperse dyes, while polyurethane fibers have to be dyed with acid dyes or metal dyes, since washfastness decreases significantly when dyed with disperse dyes.

Therefore, when mixing polyester fibers and polyurethane fibers in the manufacture of knitted fabrics, a chlorobenzene-based or methylnaphthalene-based dyeing carrier must be used for dyeing, and the final product is susceptible to chlorine-based bleaching agents and There are many problems such as being easily hydrolyzed by.

As a method of producing latent crimping yarns by complex spinning, (i) using two kinds of polymers having different viscosities and (ii) two types of polymers having different degrees of swelling with water to express crimps. There is a way.

Due to the difference in the degree of double swelling, latent crimping yarns emit polymers of the same type having different degrees of swelling by water to have a side by side cross-section to bond the two polymers at the interface. After the yarn is manufactured, it is swelled with water to express the crimp by the difference in the degree of swelling.

The above method is applicable only when the resin causing the difference in the degree of swelling by water is polymerized separately. In particular, at least one polymer should contain more ionizing groups than the other polymer to show the swelling difference.

Next, a method of producing a composite spun latent yarn using a homopolymer having different viscosities is to spin two kinds of polymers having different viscosities in the form of side by side so that two polymers having different viscosities are lengthened. After the yarns are bonded to each other at the interface in the direction, the yarns are heat-treated in a relaxed state to express the crimp in the form of a spring due to the difference in shrinkage stress due to the difference in viscosity of the two polymers.

The latent crimping yarn by the composite spinning is easy to dye and post process by using the polymer of the same type, and is a method that has been widely used in recent years, showing a unique soft touch.

As a result, the method of complex spinning two kinds of polymers having different viscosities as described above can solve the problems of various methods, and has the advantages of shortening work processability and cost reduction, and excellent elasticity and soft touch. It is widely applicable to knitting as well as fabrics.

However, in this method, due to the difference in viscosity between the high viscosity polymer and the low viscosity polymer, asymmetrical swelling increases due to the shear rate and normal stress difference of the two types of polymers in the molten state during spinning, resulting in a curvature phenomenon. This phenomenon leads to deterioration of operability, which is a disadvantage in terms of production management. In addition, separate, homogeneous resins having different intrinsic viscosities must be prepared, and since the potential crimp performance can be varied depending on the intrinsic viscosity of one polymer, it is cumbersome to require special management of intrinsic viscosities. .

In addition, in the above method, in order to maximize the crimping performance of the potential crimping yarn, it is difficult to apply the radial direct drawing method having a low spinning speed between the lower part of the detention and the first roller in order to maximize the difference between the radiation crystallization and the orientation. There was a problem.

On the other hand, there is a method to show the potential crimp performance due to the shrinkage characteristics of the high shrink copolymer by the composite spinning and hot water treatment of the copolymer and high polymer expressing high shrinkage.

However, after fabricating the fabric using the latent crimp type bicomponent composite yarn prepared by the above method, and then forming a crimp by hydrothermal treatment, excessive shrinkage of the fabric is likely to occur due to the polymer of high shrinkage property. That is, high shrinkage yarns using high shrinkage polymers typically have a high boiling water shrinkage of about 30%. Therefore, there is a problem that excessive shrinkage occurs to reduce the width of the fabric at the same time the thickness is thick, the touch is rough and does not meet the purpose.

In addition, the conventional latent crimps described above have a problem that it is impossible to dye with a cationic dye and the melange effect does not appear.

The object of the present invention can be manufactured by the direct radiation stretching method to solve the conventional problems, can be dyed with a cationic dye, has a melange effect and excellent elasticity and excellent post-process passability in the production of knitted fabrics It is to provide a latent crimping polyester bicomponent composite yarn expressing tactile and repulsive properties.

The present invention exhibits spontaneous three-dimensional spiral structure during hot water treatment due to its excellent crimping ability, excellent stretchability and post-process passability, dyeing with cationic dyes, and latent crimping polyester having a melange effect. To provide a component composite yarn.

In order to achieve the above object, the present invention provides a polyester-based two-component composite yarn in which two different polyester-based polymers are combined, wherein one of the two components is polyethylene terephthalate and the other one component. Is characterized in that the cationic dye salt-coated polyester is copolymerized with a compound having the structure of formula (I).

[Wherein R ₁ and R ₂ are a methyl group, an ethyl group or a hydrogen atom and M is an alkali metal.]

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

First, in the present invention, after the composite spinning of a cationic dye salt-type polyester resin in which polyethylene terephthalate resins of different types and a compound having the structure of the general formula (I) are copolymerized, the two-component composite yarns continuously spun The latent crimping polyester two-component composite yarn is manufactured by a radial direct drawing method for drawing and heat-treating or a poy method for drawing in a separate process after production of an undrawn yarn.

Specifically, in the present invention to prepare a latent crimp polyester two-component composite yarn, one component is polyethylene terephthalate resin and the other component is a compound having the structure of formula (I) is copolymerized Spin-draw method that uses spinning and stretching and heat treatment in one continuous process as well as the POY method as in the prior art by using a cationic dye salt type polyester resin. The latent crimp polyester bicomponent composite yarn (hereinafter, referred to as "two component composite yarn") is produced.                     

1 is a process schematic diagram of producing a two-component composite yarn of the present invention in a radial direct drawing method.

Two components constituting the two-component composite yarn of the present invention, that is, a cationic dye salt type polyester resin in which a polyethylene terephthalate resin and a compound having the structure of the general formula (I) are copolymerized, Side-by-side type or sheath / core type.

The polyethylene terephthalate resin used by this invention is a polyester resin used for the manufacture of the yarn for garments normally.

On the other hand, another component is the cationic dye salt-type co-polyester with which the compound which has the structure of the said general formula (I) is copolymerized. It is preferable that the air content of the compound which has a structure of the said General formula (I) copolymerized in the said cationic dye salt-type co-polyester is 1-5 mol%.

When the copolymerization amount is less than 1 mol%, dyeing with cationic dye may not be performed, and sufficient crimping may not be expressed during boiling water treatment. If the copolymerization amount is more than 5 mol%, the physical properties of the yarn may be lowered.

Examples of the compound having the structure of formula (I) include sodium salt of dimethyl 3,5-sulfoisophthalate (DMIS), potassium salt of dimethyl 3,5-sulfoisophthalate, and diethyl 3,5-sulfoy Lithium salt of sophthalate or sodium salt of 3,5-sulfoisophthalic acid (SIPA);

The cross-sectional area ratio (compared to the total cross-sectional area of the two-component composite yarn) of the above two kinds of polymers constituting the two-component composite yarn is composite spun to be 20% or more.                     

In other words, both the cross-sectional ratio of the polyethylene terephthalate resin to the total cross-sectional area of the two-component composite yarn and the cross-sectional ratio of the cationic dye salted polyester resin copolymerized with the compound having the structure of Formula (I) are 20% or more. do.

More specifically, in the total cross-sectional area of the bicomponent composite yarn, the cross-sectional ratio of the polyethylene terephthalate resin: the cationic dye salt type polyester resin in which the compound having the structure of the general formula (I) is copolymerized is 2: 8 to 8: 2. to be.

If the ratio of the cross-sectional area of the cationic dye salt-type polyester copolymerized with the compound having the formula (I) is less than 20%, the high shrinkage component is too small to express sufficient crimp during boiling water treatment. The crimping performance of the composite yarn is deteriorated, so the elasticity and resilience of the fabric is decreased.

On the other hand, when the cross-sectional area ratio of polyethylene terephthalate is less than 20%, crimp expression is difficult due to the lack of a low shrinkage component.

The latent crimp polyester bicomponent composite yarn of the present invention described above can be colored by dyeing with a cation dye, and exhibits good touch and repulsion characteristics in the production of knitted fabrics, and also has a melange effect.

Hereinafter, the present invention will be described in more detail with reference to Examples and Comparative Examples. However, the present invention is not limited only to the following examples.                     

Example 1

Radiation direct stretching is carried out using polyethylene terephthalate for clothing as a component and cationic dye salt-coated polyester with another 5 mol% of sodium salt of dimethyl 3,5-sulfoisophthalate as another component. The composite yarn was wound and wound in a side-by-side manner to prepare a bicomponent composite yarn of 60 denier / 24 filaments.

At this time, the cross-sectional ratio of the polyetherene terephthalate to the total cross-sectional area of the bicomponent composite yarn and the cross-sectional ratio of the cationic dye salt type co-polyester were 50%.

After weaving using the two-component composite yarn prepared as described above as warp and weft yarn, refined, reduced, reduced alkali (reduction rate: 30%), washed, dyed and processed to prepare a processed fabric.

The properties of the prepared two-component composite yarns and processed fabrics measured by the method described below are shown in Table 2.

Examples 2-5

The same process as in Example 1 except that the copolymerization amount (mol%) of the sodium salt of dimethyl 3,5-sulfoisophthalate and the cross-sectional ratio of each component in the cationic dye salt-copolymerized polyester were changed as shown in Table 1 below. And conditions were prepared two-component composite yarns and fabrics.                     

The properties of the manufactured two-component composite yarns and processed fabrics measured by the method described below are shown in Table 2.

Manufacture conditions division Copolymerization Amount (mol%) of Sodium Salt of Dimethyl 3,5-Sulfoisophthalate in Cationic Salt Copolymer % Of cross-sectional area of each component Polyethylene terephthalate Cationic Dye Salting Copolymer Example 1 5 50 50 Example 2 5 30 70 Example 3 3 50 50 Example 4 3 30 70

Comparative Example 1

A two-component composite yarn was prepared in the same process and conditions as in Example 1 except that polyethylene terephthalate having an intrinsic viscosity of 0.53 was used as one component and polyethylene terephthalate having an intrinsic viscosity of 0.67 was used as another component.

The properties of the manufactured two-component composite yarns and processed fabrics measured by the method described below are shown in Table 2.

Comparative Example 2

The same process as in Example 1 except that a high shrinkage polyester copolymerized with 13 mol% of isophthalic acid in polyethylene terephthalate was used as one component, and a general polyethylene terephthalate for clothing was used as the other component. Two-component composite yarns were prepared under the conditions.

The properties of the manufactured two-component composite yarns and processed fabrics measured by the method described below are shown in Table 2.

Property evaluation results of two-component composite yarns and fabrics division 2-component composite yarn Processing fabric properties Boiling Water Shrinkage (%) Crimp recovery rate (%) Elongation (%) Elongation recovery rate (%) Inclination Weft direction Inclination Weft direction Example 1 12 52 48 49 95 95 Example 2 13 50 45 48 93 92 Example 3 11 51 47 49 94 91 Example 4 12 48 44 45 90 89 Comparative Example 1 11 10 42 47 82 86 Comparative Example 2 12 21 41 47 87 85

In the present invention, various physical properties of the latent crimp two-component composite yarn were evaluated by the following method.

Boiling Water Shrinkage (Sr) and Crimp Recovery (CR)

First, a skein is made with 10 turns of denier krill (the tension at the time of winding is displayed fineness x 1 / 10g). Measure the length L ₀ by attaching the initial load (display fineness x 1 / 20g) and the static load (display fineness x 2g) to the produced thread. After heat treatment for 15 minutes in water at 100 ℃, remove the water with absorbent paper, leave it for 12 hours in the room, measure the length with super load and static load (L ₁ ). After standing for 2 minutes in water (20 ℃ ± 2 ℃) to measure the length of the sample (L ₂ ). Remove the static load, leave for 3 minutes and measure the length of the sample (L ₃ ). The measured values are substituted into the following equation to calculate the boiling water shrinkage ratio (Sr) and the crimp recovery ratio (CR).

% Elongation of fabric

Fabric elongation is measured according to the Korean Industrial Standard KS K 0352 "Stretch Test Method for Stretch Fabrics". In other words, the tensile test is carried out using a tensile tester capable of a tensile test on the fabric. The elongation of the fabric is 20 cm. . Perform both inclined and weft directions, measuring five times and averaging them.

Elongation recovery rate of fabric (%)

The elongation recovery of the fabric is measured by KS K 0352 as in the fabric elongation. That is, it is stretched at a constant speed to the length of 80% of the elongation obtained by the above method, left for 1 minute, recovered at the same speed, left for another 3 minutes, and stretched at the same speed to the length of 80% of the elongation again. This stretch is performed 10 times and the length when the load is removed is measured and substituted into the following equation to obtain the stretch recovery rate of the fabric. Perform in both warp and weft directions, average 5 times each                     

However, L ₅ : length drawn up to 80% of the elongation of the fabric test piece

L ₆ : Length after removing 10 times of load after giving 10 repetitive loads

As can be seen from the above evaluation results, the latent crimping yarn of the embodiment is sufficiently low in boiling water shrinkage so that the width of the fabric can be easily adjusted, and the crimp recovery is excellent, thus making it easy to manufacture the stretchable fabric. In addition, the recovery rate of the fabric shows a very high recovery rate, there is little deformation due to the elongation of the fabric and the shape stability is excellent.

However, the comparative examples are relatively poor in the various properties described above.

The latent crimp polyester two-component composite yarn of the present invention can be dyed with a cationic dye, has a melange effect, expresses unique micro crimps in the manufacture of woven fabrics, gives good elasticity, and provides a soft touch and resilience. There is this.

In addition, the two-component composite yarn of the present invention can be produced by a radial direct drawing method, which simplifies the process, and has a flat structure before the hydrothermal treatment, and thus has excellent post-processing properties such as knitting.

Claims (6)

In a polyester-based two-component composite yarn in which two different polyester-based polymers are compounded, one of the two components is polyethylene terephthalate, and the other component is a compound having the structure of the following general formula (I): A latent crimping polyester two-component composite yarn with a melange effect, characterized in that the copolymerized cationic dye salt-copolymerized polyester.

[Wherein R ₁ and R ₂ are a methyl group, an ethyl group or a hydrogen atom and M is an alkali metal.] The latent crimping polyester bicomponent composite yarn having a melange effect according to claim 1, wherein 1 to 5 mol% of the compound having the structure of the general formula (I) is copolymerized in the cationic dye salt type copolyester. . The compound according to claim 1, wherein the compound having the structure of general formula (I) is sodium salt of dimethyl 3,5-sulfoisophthalate (DMIS), potassium salt of dimethyl 3,5-sulfoisophthalate, diethyl 3, A latent crimping polyester bicomponent composite yarn having a melange effect, which is a lithium salt of 5-sulfoisophthalate or a sodium salt of 3,5-sulfoisophthalic acid (SIPA). The melange according to claim 1, wherein the two components constituting the latent crimp polyester bicomponent composite yarn are conjugated in a side by side type or a sheath / core type. Potential crimp polyester 2-component composite yarn with effects. The latent crimp polyester having a melange effect according to claim 1, wherein the ratio of the cross-sectional area of each of the two components constituting the bicomponent composite yarn to the total cross-sectional area of the latent crimp polyester bicomponent composite yarn is 20% or more. Bicomponent composite yarn. Knitted fabric comprising the latent crimp polyester 2-component composite yarn of claim 1.

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