KR20030089593A - A side by side type conjugate fiber with excellent crimping property - Google Patents

Abstract

PURPOSE: Provided is a side by side conjugated yarn which involves excellent crimping endurance and section formation, and is well adapted for use in manufacturing clothes. CONSTITUTION: A side by side conjugated yarn comprises has a first fiber formation element, and a second fiber formation element. Only one of the first and the second fiber formation elements has a base polymer and an alignment inhibitor, and the crimping rate thereof by heat treatment is 30-70%. The alignment inhibitor is selected from methyl methacrylate, polymethyl methacrylate or imides thereof, polyamide 66, polyethylene, polypropylene, polyethylene glycol, or caprolactone.

Description

Side by side composite fiber with excellent crimping property and method for manufacturing the same {A side by side type conjugate fiber with excellent crimping property}

The present invention relates to a side-by-side composite fiber excellent in crimping property and a manufacturing method thereof.

Natural fibers and regenerated fibers have better aesthetics and feel than synthetic fibers, but lack the elasticity.

As a conventional technique for imparting elasticity to synthetic fibers, a method of producing a composite twisted yarn having crimping property by stretching a polymer having the same composition differently in heat shrinkability and then complexing it with air entanglement is known. Although the method has simple characteristics compared to other methods, there are various problems such as uneven expression state of crimps and weakness of mutual convergence between fibers, resulting in separation of complexed components by external force applied to fibers during post-processing.

As another conventional technology, a method of mixing polyurethane-based fibers to give elasticity is also attempted. However, the polyurethane-based fiber of the method has a problem in that the touch is hard as the inherent properties of polyurethane, which lowers the feel and drape of the fabric. In addition, the polyurethane-based fiber is not dyed in the dye for polyester, even when used in combination with the polyester fiber has a problem that the dyeing process is complicated, as well as difficult to dye in the desired color.

Due to such a problem, a method of manufacturing a polyester composite fiber by using a parallel by-side (Side By Side Type) composite spinning method has also been proposed without using polyurethane-based fibers and combustible work. Compound spinning is a combination of two polymers from a single spinneret and injection wound, and can be classified into two methods: a thermal shrinkage difference between polymers and a swelling shrinkage difference between polymers.

The method of using a heat shrinkage difference is a method of joining two thermoplastic polymers having different shrinkage temperatures in the fiber length direction as in Japanese Patent Application Laid-Open No. 68-295634, and the method of using a swelling difference difference has a swelling difference due to the action of water. It is a method of bonding a bicomponent polymer in the fiber longitudinal direction. In the method using the swelling shrinkage difference, a polymer containing more ION groups than one component is used.

The spinneret device of the crimped composite fiber has a structure that induces a plurality of components compared to the conventional single-component spinneret device, which makes the device considerably more complicated. In addition, since at least two or more components having different properties are spun together, various problems occur that do not occur in uniform single component radiation.

Specifically, in the case of complex spinning of two components having different melt viscosities, there is a tendency for yarns to bend toward the larger melt viscosities directly under the discharge holes, thereby reducing the radioactivity by weakening the sand, and in the case of severe spinning Sticks to detention, making operation completely difficult. In addition, since the abnormal residence of the polymer is generated in the spin pack or the inside of the cap, the sacrificial properties may be significantly reduced.

In order to solve such a problem, a method of similarly controlling the composition and the degree of polymerization between the two-component polymers used in the composite spinning may be considered. In addition, a method of changing the structure of the complex spinning cap such as forming an uneven portion or protruding a discharge hole in the complex spinning cap may be considered. In this case, however, the management and maintenance of facilities become complicated.

In order to improve the above problem, Japanese Patent Laid-Open Nos. 2-139414 and 3-113044 disclose a method of using a highly shrinkable modified polymer. However, in the case of the above method, it is possible to obtain a certain degree of stretch, but when the fabric is stretched, there is a disadvantage that the generated stress is high and the tightening feeling is strong.

In addition, there is a problem that the crimp expression ability is low or the crimp is easily deformed by the external force due to the fabric texture, but it is known that if the shrinkage is limited according to the characteristics of the fabric texture, it is heat treated as it is and loses more shrinkage.

An object of the present invention is to provide a side-by-side composite fiber excellent in crimping property, crimp durability and cross-sectional formability to solve the problems of the prior art. It is another object of the present invention to provide a method for producing the composite fiber with better operation and productivity.

In the present invention, when the side-by-side composite fiber is produced, the base polymer (base polymer) using two or more fiber-forming components of the same or similar to the bending phenomenon in the spinneret and the polymer abnormality in the spinneret To effectively prevent the retention phenomenon to improve productivity and operability. In addition, the present invention is to improve the crimping property and crimp durability of the composite fiber by adding an orientation inhibitor which is incompatible with the base polymer only to one of the fiber-forming components.

1 is a process schematic diagram of the present invention

Figure 2 is an electron microscope photograph of the cross section of the present invention composite fiber

Figure 3 is an electron microscope photograph taken in the longitudinal side of the composite fiber of the present invention

Figure 4 is an electron microscope photograph taken in the longitudinal side of the composite fiber of the present invention subjected to hydrothermal treatment for 15 minutes at 100 ℃

※ Explanation of main parts in drawings

1a: orientation inhibitor and first fiber forming component (base polymer) feeder

1b: first fiber-forming component (base polymer) feeder

1c: second fiber forming component (base polymer) feeder

2a: first extruder 2b: second extruder

3: side extruder or side feeder 4: composite radiation detention

In the side-by-side composite fiber of the present invention for achieving the above object, the fiber-forming component in the composite fiber in which the first fiber-forming component and the second fiber-forming component is composited in a side-by-side type Only one of the fiber-forming components is contained in the base polymer and incompatible orientation inhibitors, characterized in that the crimp rate by heat treatment is 30 to 70%.

In addition, the manufacturing method of the side-by-side composite fiber of the present invention is to produce a composite fiber by composite spinning the first fiber-forming component and the second fiber-forming component in a side-by-side type, among the fiber-forming components It is characterized in that only one fiber-forming component is mixed with the fiber-forming component and an incompatible orientation inhibitor.

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

The composite fiber of the present invention comprises (i) a fiber-forming component in which a base polymer, an incompatible (ii) orientation inhibitor and a base polymer are mixed, that is, an orientation inhibitor is contained in the base polymer (hereinafter referred to as "first fiber-forming component." A structure in which the fiber-forming component (hereinafter referred to as "the second fiber-forming component") composed only of the base polymer not containing the alignment inhibitor and "orientation inhibitor" is alternately spun in the form of side by side Have

In the present invention, polymers having the same or similar melt viscosities are used as base polymers of the two fiber-forming components in order to prevent curvature or the like directly under confinement during complex spinning. More preferably, polymers having the same melt viscosity as each other may be used together as the base polymer of the first fiber forming component and the base polymer of the second fiber forming component.

As the base polymer, polyethylene terephthalate, polytrimethylene terephthalate or polybutylene terephthalate is used.

On the other hand, the content of the orientation inhibitor in the first fiber-forming component (component containing the orientation inhibitor) is 0.01 to 10.0% by weight. When the content of the alignment inhibitor exceeds the above range, the effect of cooling solidification increases, so severe cutting occurs, or the alignment inhibitor is unevenly dispersed, which may cause staining. On the other hand, when the content of the orientation inhibitor is lower than the above range, there is a fear that the orientation inhibitory effect is weakened, the crimping effect is weakened.

The orientation inhibitors include methyl methacrylate, polymethyl methacrylate or imides thereof, polyamide 66, polyethylene, polypropylene, polyethylene glycol or caprolactone.

More preferably, it is preferable to use polymethyl methacrylate having the structure of the general formula (I) below or polymethyl methacrylate having the structure of the following general formula (II) as an orientation inhibitor.

In the formula (II), n is an integer of 1 to 6, and m is an integer of 1 to 3]

The orientation inhibitor does not react with the base polymer and is present in a dispersed state inside the polymer to inhibit orientation crystallization. For this purpose, the orientation inhibitor is preferably incompatible with the base polymer.

Specifically, the orientation inhibitor has a bulky side chain, maintains coil composition even in high elongation on the radiation, has low mobility, and serves to delay the extension deformation behavior of the base polymer on the radiation.

In addition, the orientation inhibitor is located between the polymer crystal and the polymer crystal in a uniformly dispersed state, and serves to delay crystallization by inhibiting crystal growth. At this time, the orientation difference occurs at the interface with the other end portion where the orientation inhibitor is not added, and this effect is proportional to the amount of the additive to be added.

This is because when the filament is heated in the filament state, the filament is wound in a three-dimensional coil form due to the difference in orientation. This effect is a factor of improving the unique touch, elasticity and bulkiness of the fabric due to the crimping effect of the latent crimp as shown in FIG. Becomes

The composite fiber of the present invention is further composed of 30 to 70% by weight of the first fiber forming component containing an orientation inhibitor and 70 to 30% by weight of the second fiber forming component containing no orientation inhibitor based on the total weight. desirable.

The side-by-side composite fiber of the present invention has a very good crimpability, with a crimp rate (hereinafter referred to as "crimp rate by heat treatment") measured by the following method being 30 to 70%.

· Crimp rate measurement method by heat treatment

After the yarn was rotated 10 times with a thread, three samples were made by knotting three places. The fiber skein was heat treated for 15 minutes under no tension in 100 ° C. boiling water, then completely dried and heat-treated for 15 minutes under no tension in a 180 ° C. dryer. After loading the sample as 0.2g x denier x winding number and leaving it for 10 minutes, obtain the ledger (L ₀ ), change it to 1.0mg x denier x winding number, and leave it for 10 minutes, then crimp generation length (L _1). ), And then, these measured values are substituted into the following equation to calculate the crimp rate by heat treatment.

In addition, the cross-sectional stability and mass balance of the side-by-side composite fiber of the present invention was evaluated by the following method was very excellent.

Section stability evaluation method

Sectional stability is evaluated by measuring the yarn cross-sectional shape, section deviation and mass balance. At this time, the cross-sectional shape and the deviation are measured by taking a cross-sectional picture, according to the sensory evaluation of the expert group. In other words, the experts consisted of 10 experts to determine the cross-sectional stability, but 8 or more were judged to have excellent stability, and 6 to 7 were judged to be excellent, and 5 or more were judged to be △.

Mass balance system

Zellweger's USTER TESTER is measured while suddenly feeding at a speed of 25m / min.

The side-by-side composite fiber of the present invention described above is one of the fiber-forming components in producing a composite fiber by composite spinning the first fiber-forming component and the second fiber-forming component in a side-by-side type It is produced by a method of mixing only the fibrous component of the fibrous component with the orientation inhibitor which is incompatible.

In this case, the orientation inhibitor may be directly added to the base polymer during the polymerization of the fiber-forming component to which the orientation inhibitor is to be added. However, the method may be applicable only when the orientation inhibitor is better in heat resistance than the base polymer.

As another method of adding an orientation inhibitor, a side extruder 3 is used to melt and mix a part of the base polymer of the first fiber-forming component with an orientation inhibitor to prepare a masterbatch chip as shown in FIG. 1. Thereafter, the manufactured masterbatch chips and the remaining chips of the first fiber-forming component may be supplied to the extruder 2a to melt and mix them.

When the first fiber-forming component to which the alignment inhibitor is added is prepared and then spun together with the second fiber-forming component to which the orientation inhibitor is not added, the composite fiber of the present invention is manufactured. do.

When the master batch chip is prepared as described above and the alignment inhibitor is added to the base polymer, it is preferable to adjust the content of the alignment inhibitor in the master batch chip to 5 to 50% by weight. In addition, the master batch chip is supplied to the extruder 2a through the sub-supply pipe and the remaining chips of the fiber-forming component are respectively supplied to the extruder 2a through the main supply pipe, and then these are extruder 2a. It is more preferable to melt and mix at the front end of the).

Another method of adding an orientation inhibitor is to prepare a molten mixture by melting and mixing a portion of the base polymer of the first fiber-forming component and an orientation inhibitor using the side feeder 3 as shown in FIG. The melted mixture and the remaining chips of the first fiber-forming component may be supplied to the extruder 2a to melt and mix them.

Since the manufacturing method of the present invention uses polymers having the same or similar melt viscosity as the base polymer of the fiber-forming components, it is possible to effectively prevent the phenomenon of curvature under the detention and the abnormal retention phenomenon of the polymer in the detention. As a result, the spinning operation and the stretching operation, which are evaluated in the following manner, are excellent and productivity is improved.

Radiation operability evaluation method

It is evaluated by the unfolding rate during the production of 600 6kg yarn drums.

· Extension Capacity Evaluation Method

When the 6kg drum is drawn with 3kg bobbin, it is evaluated by the ratio of bad yarn caused by draw failure and cutting.

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

20 wt% of polymethacrylate (hereinafter referred to as "PMMA") and 80 wt% of polyethylene terephthalate (hereinafter referred to as "PET") with a molecular weight of 1,500 are melt-blended in a side extruder (3) to prepare a masterbatch chip. Manufacture. Next, the master batch chip and the polyethylene terephthalate (PET) chip are supplied to the extruder 2a to melt-mix them at the front of the extruder 2a to prepare a first fiber-forming component to which an orientation inhibitor is added. . At this time, the content of PMMA (orientation inhibitor) in the first fiber-forming component was adjusted to 5% by weight. Next, 50% by weight of the first fiber-forming component prepared as described above and 50% by weight of the second fiber-forming component composed of only PET were spun at a spinning speed of 3,000 m / min in a side-by-side compound spinning mold. Thereafter, the film was stretched at a draw speed of 650 m / min and a draw ratio of 1.6 times to prepare a side by side type composite fiber having 100 denier 24 filaments. The results of evaluating the properties and operability of the prepared composite fiber are shown in Table 2.

Example 2-Example 4 and Comparative Example 1-Comparative Example 2

Except for changing the type and content of the orientation inhibitor, the base polymer and the spinning speed of the fiber-forming component as shown in Table 1, the side-by-side composite fiber is prepared in the same process and conditions as in Example 1. The results of evaluation of physical properties and operability of the prepared composite fiber are shown in Table 2.

Manufacture conditions division First Fiber Forming Component (Base Polymer) Second Fiber Forming Component (Base Polymer) Kind of orientation inhibitor Orientation Inhibitor Content (wt%) in Composite Fiber Spinning speed (m / min) Example 1 PET PET PMMA 2.5 3,000 Example 2 PET PET PMMA / PE 7.5 4,800 Example 3 PBT PET MMA 0.3 3,400 Example 4 Polyamide 6 Polyamide 6 Imide PMMA 6.0 4,350 Comparative Example 1 PBT PET - - 3,200 Comparative Example 2 PET PET - - 3,000

In Table 1, PBT is polybutylene terephthalate, PE is polyethylene and MMA stands for methylmethacrylate.

Operational and Yarn Properties division Radiation Operation (%) Stretching Capacity (%) Section stability Mass balance agent (%) Crimp rate by heat treatment (%) Example 1 97.5 1.35 ◎ 0.9 47.3 Example 2 95.3 1.62 ◎ 1.2 65.4 Example 3 95.5 1.72 ◎ 1.1 52.0 Example 4 93.7 1.82 ◎ 1.3 43.2 Comparative Example 1 35.6 6.70 ◇ 2.3 25.4 Comparative Example 2 54.5 8.35 △ 3.5 35.3

The side-by-side composite fiber of the present invention is excellent in crimping property, crimp durability and cross-sectional formability and is useful as a yarn for clothes. In addition, the manufacturing method of the present invention is excellent in operability and productivity.

Claims (11)

In the composite fiber in which the first fiber-forming component and the second fiber-forming component are composited side by side, an orientation inhibitor that is incompatible with the base polymer in only one of the fiber-forming components is formed. Side-by-side composite fiber excellent in crimping property, characterized in that the crimp rate is 30 to 70% by heat treatment. The side-by-side composite fiber excellent in crimpability according to claim 1, wherein the base polymer of the first fiber-forming component and the base polymer of the second fiber-forming component are the same. The side-by-side composite fiber having excellent crimpability according to claim 1, wherein the content of the orientation inhibitor in the fiber-forming component containing the orientation inhibitor is 0.01 to 10.0 wt%. The side-by-side having excellent crimpability according to claim 1, wherein the alignment inhibitor is methyl methacrylate, polymethyl methacrylate or imide, polyamide 66, polyethylene, polypropylene, polyethylene glycol or caprolactone. Type composite fiber. The side-by-side type having excellent crimpability according to claim 1, wherein the base polymer of the first fiber forming component and the second fiber forming component is polyethylene terephthalate, polytrimethylene terephthalate or polybutylene terephthalate. Composite fiber. The side-by-side excellent crimp according to claim 1, comprising 30 to 70% by weight of the fiber-forming component containing the orientation inhibitor in the base polymer and 70 to 30% by weight of the fiber-forming component composed only of the base polymer. Side type composite fiber. In preparing a composite fiber by composite spinning the first fiber-forming component and the second fiber-forming component in a side-by-side type, only one of the fiber-forming components is incompatible with the fiber-forming component. A method for producing a side by side composite fiber having excellent crimping property, comprising mixing an adult orientation inhibitor. The side-by-side composite fiber having excellent crimpability according to claim 7, characterized in that the orientation forming agent is mixed in the fiber-forming component chip to be mixed with the feeder 1b and then fed into the extruder 2a. Manufacturing method. The method of claim 7, wherein a portion of the fiber-forming component chip to be mixed with an orientation inhibitor and a side extruder (3) is melted and mixed to prepare a masterbatch chip, and then the prepared masterbatch chip and the fiber-forming component Method for producing a side-by-side composite fiber excellent in crimping, characterized in that the remaining chips of the feed to the extruder (2a) and melt-mixing them. The method of manufacturing a side by side composite fiber having excellent crimping property according to claim 9, wherein the content of the orientation inhibitor in the masterbatch chip is adjusted to 5 to 50% by weight. The method according to claim 9, wherein the remaining chips of the fiber-forming component are supplied to the extruder 2a through the main supply pipe, and at the same time as the master batch chip is supplied to the extruder 2a through the sub supply pipe, and then the extruder ( 2a) A method for producing a side-by-side composite fiber excellent in crimping, characterized in that the melt mixing at the front end.