KR100430629B1 - A sea island type composite fiber with multi line and multi island - Google Patents

Abstract

The present invention relates to a multi-column multi-phase islands-in-the-sea composite fiber composed of seaweed components of a thermoplastic resin and an alkali-soluble co-polyester, wherein 38 to 500 island-based fibers are contained within a single filament (monofilament). Arranged in concentric circles of rows 10 to 10, wherein the island component fibers are divided into 4 to 8 axisymmetric repeat units (I), and the number of island component fibers in the concentric circles in the axisymmetric repeat units (I) (H ^u) _n ) and the total number of component fiber counts (H _n ) of each of the concentric circles are controlled within a predetermined range. The island-in-the-sea composite fiber of the present invention is excellent in fiber cross-sectional formation and sea component elution, and can provide a uniform and fine island component fiber after sea component elution, thereby improving the feel, appearance and suede effect of the product. have.

Description

A sea island type composite fiber with multi line and multi island}

The present invention relates to a multi-row multi-phase islands-in-the-sea composite fiber which can extremely improve the quality of the brushed knitted fabric which is the final product, even though the fineness of the island component fiber becomes very fine after dissolution of the sea component.

The process of manufacturing suede knitted fabric using island-in-the-sea composite fiber has to go through various complicated steps such as weight loss, brushing, dyeing, etc. In this regard, the in-cross-sectional arrangement and composition of the island component fibers is a key factor in determining the quality.

The island-in-the-sea composite fiber is manufactured by using an alkali-soluble polymer as a sea component and a fiber-forming polymer as a island component, and composite spinning them into an island-in-the-sea type, mainly for the purpose of producing ultrafine fibers. Is being produced. In other words, after preparing the island-in-the-sea composite fiber, it is treated with an alkaline solution to elute the sea component which is an alkali-soluble polymer, thereby producing an ultrafine fiber composed only of the island component.

As described above, the method of manufacturing the ultrafine fibers from the island-in-the-sea composite fiber has the advantages of superior spinning and stretching operations and more fineness of fine fibers compared to the method of manufacturing the ultrafine fibers by direct spinning. After knitting, the process of eluting and removing the sea component polymer with an organic solvent in a processing step is required.

Since the quality of the suede-like brushed knitted fabric which is the final product can be improved according to the degree of fineness of the island component fiber, it is true that many researches and developments are carried out to further refine the fineness of the island component fiber.

The technology generally commercialized up to now is that the number of island component fibers is 37 or less, and the fineness of the finely divided island component fibers remains at 0.05 denier level. Therefore, it may be necessary to develop a technology capable of manufacturing fineness of the island component fibers to 0.04 denier or less while expanding the number of island component fibers to 38 or more.

However, when the number of island component fibers is 38 or more, the cross-sectional formation structure is very important, and the arrangement of the island component fibers within the composite fiber cross section must be very precisely designed. In view of this dimension, the expansion of the arrangement of island-in-the-sea composite fibers having 37 islands-in-the-sea fibers as it is impossible to ensure stable formation of the cross-section of the island-in-the-sea composite fibers, since the arrangement of the island-in-the-sea fibers in the island-in-the-sea composite fiber cross section cannot be secured. Special design skills were urgently needed.

In general, alkali-soluble copolyester is mainly used as the sea component polymer used in the island-in-the-sea composite fiber. The reason for this is that the dissolution of the sea component is possible in alkaline solutions and weight reduction facilities which are widely applied in weight reduction processing of general polyester fabrics without the use of special equipment and costly organic solvents.

When the water-based polymer is nylon, the dissolution rate of the sea component is not very important because the degree of nylon invasion by the alkaline solution is very low when the sea component is eluted. If the speed is low, the island component is violated before the sea component is completely eluted, and the yarn strength is drastically lowered after the dissolution.

As a result, the raising properties are poor and it is difficult to express the appearance and feel of the target final product. This problem may occur more seriously in the case of 38 to 500 multi-row multi-phase islands-in-the-sea composite fibers.

An object of the present invention is excellent in cross-sectional formability and sea component elution, and after sea component elution, the island component fibers having a uniform fineness of 0.001 ~ 0.3 denier is formed, the feel, appearance and suede effect of the brushed knitted fabric as the final product To provide a multi-row multi-phase islands-in-the-sea composite fiber that can improve.

In the present invention, 38 to 500 island component fibers are arranged on concentric circles of 5 to 10 rows within a single filament, and the island component fibers are divided into 4 to 8 axisymmetric repeat units (I), and on each concentric circle. Since the number of island component fibers arranged is controlled within a certain range, it is to provide a multi-row multi-phase islands-in-the-sea composite fiber which is excellent in cross-sectional formability and is capable of forming an ultrafine island component fiber after sea component elution. In addition, the final product of the present invention is to provide a multi-row multi-phase islands-in-the-sea composite fiber which can improve the feel, appearance and suede effect of the brushed knitted fabric.

1 is an exemplary cross-sectional view of the present invention, a multi-row multi-phase islands-in-the-sea composite fiber having an axisymmetric angle θ of 60 °

2 is an enlarged view of one axisymmetric repeating unit (I) in FIG.

※ Explanation of Codes of Major Parts

DESCRIPTION OF SYMBOLS 1 island component fiber 2 sea component θ: axisymmetric angle

I: Axisymmetric repeating unit n: Concentric column number

In order to achieve the above problems, the multi-row multiphase islands-in-the-sea composite fiber of the present invention has 38 to 500 island component fibers arranged in concentric circles of 5 to 10 rows within a single filament (monofilament). These are divided into 4 to 8 axisymmetric repeating units (I), the number of island component fibers (H ^u _n ) of the concentric circles in the axisymmetric repeating unit (I) satisfies the conditions of the following formula (I), concentric circles The total number of component fiber number (H _n ) of each row is characterized by satisfying the condition of the following formula (II).

-Below-

[In formula (I) and Formula (II), n is an integer of 2-10 which shows the column number of a concentric circle, H ^u _n is the number of island component fibers of n row concentric circles in an axial symmetric repeating unit (I), H ^u _n-1 is the number of concentric fibers of n-1 concentric circles in the axisymmetric repeating unit (I), H _n is the total number of concentric fibers in the n-row concentric circles, and H _n-1 is n-1 concentric circles Is the total number of island component fibers, θ is the axisymmetric angle]

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

First, the present invention has a form in which the island component fibers (1) of the thermoplastic resin are arranged in the sea component (2) of the alkali-soluble co-polyester as shown in FIG. More specifically, 38 to 500 island component fibers are arranged in concentric circles of 5 to 10 rows inside a single filament (monofilament).

If the number of island component fibers is less than 38, the fineness of the island component fibers is thickened after dissolution of the sea component, resulting in a deterioration of the feel, appearance, and suede effect. In addition, a diameter deviation between the island component fibers is also generated.

If the concentric circles are less than 5 rows, the number of the island component fibers to be arranged in the same concentric circle is too large, the spacing between the island component fibers located in the same concentric circle is too close, which results in poor sea component dissolution. If the concentric circles exceed 10 rows, the spacing between the concentric circles becomes so close that it is difficult to dissolve the sea component located between the concentric circles.

In addition, the island component fibers of the multi-row polyphase composite fiber of the present invention are arranged at an axis symmetry angle (θ) of 45 to 90 ° so as to be divided into 4 to 8 axis symmetric repeat units (I).

In the present invention, since 38 to 500 island component fibers are arranged on 5 to 10 concentric circles, the spacing between island component fibers cannot be maintained uniformly without arranging island component fibers in axial symmetry. Cross-sectional formation cannot be maintained stably.

1 is a cross-sectional view of a multi-row polyphase composite fiber of the present invention having six axisymmetric repeating units I, that is, an axisymmetric angle θ of 60 °.

In the present invention, when the axis symmetry angle (θ) is divided into a predetermined angle from the fiber axis, the arrangement state of the island component fibers present in each divided portion means the same angle to each other. In addition, axisymmetric repeating unit (I) means each section fractional unit divided by the axisymmetric angle (θ).

Therefore, when the axisymmetric angle is 45 °, the axisymmetric repeating unit I is eight, and when the axisymmetric angle is 90 °, the axisymmetric repeating unit I is four.

In the case where the axisymmetric angle θ is less than 45 °, that is, when the axisymmetric repeating unit I exceeds 8, the area of the axisymmetric repeating unit I is too narrow, so that 2 The spacing between the island component fibers arranged in the ˜4 rows of concentric circles becomes too narrow, resulting in poor elution of the sea components located therein. This damages the island component fibers during elution of sea component, resulting in a bad brushing phenomenon.

On the other hand, when the axisymmetric angle θ exceeds 90 °, that is, when the axisymmetric repeating unit I is less than four, the spacing between concentric fibers on five or more rows of concentric circles disposed outside the fiber cross section. This becomes so narrow that elution of the sea components located at the outer shell is poor. This damages the island component fibers during elution of sea component, resulting in a bad brushing phenomenon.

In addition, the multi-row multiphase islands-in-the-sea composite fiber of the present invention is characterized in that the number of island component fibers on each concentric circle is controlled within a predetermined range.

Specifically, the number of island component fibers located at the cross-sectional center of the island-in-the-sea composite fiber, that is, the number of island component fibers (H ₁ ) located at one row of concentric circles, is 0 or 1. That is, one island component fiber may be arranged in one row of concentric circles, and the island component fiber may not be arranged.

Next, in two or more rows of concentric circles, the number of island component fibers (H ^u _n ) of the concentric circles in the axisymmetric repeating unit (I) satisfies the condition of the formula (I) below, and the total number of fibers of the concentric circles has a total number of fibers (H _n ) Satisfies the following condition (II).

-Below-

[In formula (I) and Formula (II), n is an integer of 2-10 which shows the column number of a concentric circle, H ^u _n is the number of island component fibers of n row concentric circles in an axial symmetric repeating unit (I), H ^u _n-1 is the number of concentric fibers of n-1 concentric circles in the axisymmetric repeating unit (I), H _n is the total number of concentric fibers in the n-row concentric circles, and H _n-1 is n-1 concentric circles Is the total number of island component fibers, θ is the axisymmetric angle]

The formula (I) is axially symmetrical repeating units (I) within the n island component fiber number (H ^u _n) on the open circles are axisymmetric repeating units (I) within the n-1 open island component fiber number concentric (H ^u _{n -1} ) indicates that one or two should be increased.

If it is out of the range of the formula (I), the distance between the islands of concentric fibers on the same row concentric circles and the islands of the islands on concentric circles adjacent to each other (different rows) are not kept constant, so that sea component dissolution becomes uneven. . In this case, the suede effect of the final product is greatly reduced.

The total number of component fibers on the n-row concentric circles (H _n ) and the total number of components on the n-1 concentric circles (H _n-1 ) must satisfy the conditions of formula (II).

If the formula (II) is out of the condition, the distance between the islands of concentric fibers on the same row concentric circles and the islands of the islands on the concentric circles adjacent to each other (different rows) is not uniform, resulting in deterioration of the fiber cross-sectional formation. Sea component elution also becomes nonuniform. In this case, the touch and suede effect of the final product is greatly reduced.

On the other hand, the island component fibers of the present invention is composed of a thermoplastic resin, but more preferably composed of a polyester resin or a polyamide resin.

The sea component is preferably composed of copolymerized polyester copolymerized and blended with polyethylene terephthalate 3 to 15 mol% of dimethyl-5-sulfoisophthalate sodium salt and 4 to 20 wt% of polyethylene glycol having a number average molecular weight of 8,000 or more. In the present invention, the sea component is not particularly limited.

Single-core fineness of island component fibers after sea component elution is 0.001 to 0.3 denier. If the fineness exceeds 0.3 denier, the appearance, feel and suede effect of the final product is reduced, and if less than 0.001 denier, the processability such as brushing is lowered without further improving the quality improvement effect of the final product.

In this invention, it is preferable that the structural weight ratio of a sea component and a island component is 70: 30-10: 90. If the constituent weight ratio of the sea component exceeds the above range, the density of the final processed paper may decrease, making it difficult to manufacture a practical product, and if the weight ratio of the island component exceeds the above range, the fiber cross-sectional formability and the sea component leachability This can be degraded.

The multi-row polyphase islands-in-the-sea composite fiber of the present invention is excellent in cross-sectional formability and sea component elution property, even though the island component fibers are uniformly arranged on the fiber cross-section, despite the fact that many island component fibers are arranged. In addition, after elution of the sea component, a uniform micro fine fiber may be formed, thereby greatly improving the appearance, feel, and suede effect of the brushed knitted fabric as a final product.

The multi-row multi-phase islands-in-the-sea composite fiber of the present invention may be manufactured using an island-in-the-sea composite spinning yarn including a distribution plate designed to have the same structure as that of FIG. 1.

In other words, the arrangement state of the island component polymer introduction holes of the distribution plate is designed in the same manner as the island state fiber arrangement state on the cross-section of the multi-phase polyphase composite fiber of the present invention described above.

In addition, it is preferable to appropriately adjust the length, outer diameter, and inner diameter of the island-in-the-polymer introduction hole according to the kind of thermoplastic resin constituting the island-in-the-sea fiber and the melt viscosity ratio between the island-in-the-sea polymers.

In the present invention, various physical properties of the island-in-the-sea composite fiber and brushed warp knitted fabric were evaluated by the following method.

Cross section formation

50 samples were prepared by collecting islands-in-sea composite fiber cross-sections, and evaluated by observing the cross-sectional uniformity and split state by optical microscope. Specifically, if the cross-sectional shape is uniform and there are two or less finely divided island components, the cross-section is uniform and the finely divided fine-grained island components are good. Normally, when five or more undivided island components are evaluated, it is considered bad.

Sea component elutability

The island-in-the-sea composite fiber was treated with 1% sodium hydroxide solution (bath ratio: 10: 1) at 95 ° C. for 30 minutes, and its cross sections were taken to prepare 50 samples, and evaluated by observing the presence of sea components on the cross section under an optical microscope. do. Specifically, it is evaluated as excellent when two or less samples with sea component remain, and usually when 3 to 4 samples with sea component remain, and defective when 5 or more samples with sea component remain.

Suede effect

It is evaluated by the sensory test of ten experts. Excellent if 8 or more out of 10 experts are excellent; good if 6-7 out of 10 experts are excellent; moderate if 4 to 5 out of 10 experts are excellent; less than 3 out of 10 professionals are excellent If it is judged that it is judged as bad.

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

An alkali-soluble polymer prepared by blending 92% by weight of copolymerized polyester in which 4 mol% of a metal sulfonate-containing ester unit is copolymerized with an ester unit of ethylene terephthalic acid, which is a main component, and 8% by weight of polyethylene glycol having a number average molecular weight of 8,500 It is used as a sea component and polyethylene terephthalate having an intrinsic viscosity of 0.65 is used as a island component, and these are spun through a island-in-sea composite spinneret having 196 island components at 288 ° C. At this time, using the distribution plate of the structure shown in Figure 1 and Table 1 to prepare a island-in-the-sea composite fiber with the same structure as the arrangement structure of the island component fibers. At this time, the constituent weight ratio of the sea component and the island component was 30:70. Subsequently, the spun yarn was stretched at a 2.9-fold stretching ratio between the first high roller at 80 ° C. and the second high roller at 125 ° C., and then wound at a winding speed of 4,150 m / min to draw 75 denier 16 filaments. To prepare a type composite fiber. The island-in-the-sea composite fiber was used as the yarn for the surface texture, and the copolyester polyester yarn (high shrink yarn) having a 5 denier fineness and 28% boiling shrinkage was used as the yarn for the back surface tissue. Prepare the warp letter. In this case, the use ratio of yarn for backside tissue is 26% by weight based on the total weight of the processed letter. The warp knitting fabric thus prepared was brushed to 50% shrinkage, and then preliminarily set at 190 ° C., and the sea component was eluted under a condition of 0.5% O.W.S in NaOH and 98 ° C. × 80 minutes. Further, the resultant is dyed with a disperse dye, buffed and finally set at 180 ° C. to prepare a warp knitted paper. The results of evaluating the physical properties of the island-in-the-sea composite fiber and the processed warp knitted fabric thus prepared are shown in Table 2.

Example 2-Example 3 and Comparative Example 1-Comparative Example 2

Sea island type microfiber and processed warp knitted paper with the same process and conditions as in Example 1 except that the types of island component resins, the number of island component fibers, sea component / weight component weight ratio, and the arrangement structure of the island component fibers are changed as shown in Table 1. To prepare. The results of evaluating the physical properties of the island-in-the-sea composite fiber and the processed warp knitted fabric thus prepared are shown in Table 2.

Manufacture conditions division Example Comparative Example One 2 3 4 One 2 3 Island component resin PET PET PET Nylon 6 PET PET PET Number of island component fibers () 169 91 405 91 37 91 169 Sea component / island component weight ratio 30:70 20:80 40:60 15:85 30:70 30:70 30:70 Number of concentric circles () 8 6 10 6 5 6 8 Number of separate concentric circles () H ₁ One One 0 One One One One H ₂ 6 6 9 6 6 7 7 H ₃ 12 12 18 12 12 12 12 H ₄ 18 18 27 18 18 18 18 H ₅ 24 24 36 24 24 24 24 H ₆ 30 30 45 30 0 29 29 H ₇ 36 0 54 0 0 0 37 H ₈ 42 0 63 0 0 0 48 H ₉ 0 0 72 0 0 0 0 H ₁₀ 0 0 81 0 0 0 0 Axisymmetric angle (θ) [degrees] 60 60 45 60 60 Not axisymmetric Not axisymmetric Number of Separate Concentric Circles in Axisymmetric Repeating Units H ^u ₁ 1/6 1/6 0 1/6 1/6 - - H ^u ₂ One One One One One - - H ^u ₃ 2 2 2 2 2 - - H ^u ₄ 3 3 3 3 3 - - H ^u ₅ 4 4 4 4 4 - - H ^u ₆ 5 5 5 5 0 - - H ^u ₇ 6 0 6 0 0 - - H ^u ₈ 7 0 7 0 0 - - H ^u ₉ 0 0 8 0 0 - - H ^u ₁₀ 0 0 9 0 0 - -

In Table 1, PET is polyethylene terephthalate.

Island-in-the-sea composite fiber and processed warp knit division Example Comparative Example One 2 3 4 One 2 3 Island-in-the-sea composite fiber properties Island component fiber fineness (denier) after dissolution of sea component 0.02 0.04 0.07 0.04 0.09 0.04 0.02 Cross section Great Great Great Great Great usually Bad Sea component elutability Great Great Great Great Great Bad Bad Suede effect on machined warp Great Great Great Great usually Bad Bad

The multi-row multiphase composite fiber of the present invention is excellent in cross-sectional formability and sea component elution property, and forms a uniform ultrafine fiber after dissolution of the sea component. As a result, it is possible to improve the appearance, feel and suede effect of the final product brushed knit.

Claims (6)

In the island-in-the-sea composite fiber composed of seaweed components of thermoplastic resin-based fiber and alkali-soluble co-polyester, 38 to 500 island-based fibers in a single filament (monofilament) are arranged in concentric circles of 5 to 10 rows. The island component fibers are divided into 4 to 8 axisymmetric repeating units (I), and the number of island component fibers (H ^u _n ) of concentric circles in the axisymmetric repeating unit (I) is ) and satisfy the condition, the concentric circular type conjugated fiber may hold phases that satisfy the conditions of the heat gun component fiber number (H _n), the following expression (ⅱ). -Below- [In formula (I) and Formula (II), n is an integer of 2-10 which shows the column number of a concentric circle, H ^u _n is the number of island component fibers of n row concentric circles in an axial symmetric repeating unit (I), H ^u _n-1 is the number of concentric fibers of n-1 concentric circles in the axisymmetric repeating unit (I), H _n is the total number of concentric fibers in the n-row concentric circles, and H _n-1 is n-1 concentric circles Is the total number of island component fibers, θ is the axisymmetric angle] The multi-row multi-conducting islands-in-the-sea composite fiber according to claim 1, wherein the number of island component fibers located at the center of the island-in-the-sea composite fiber (the number of island component fibers located in the first concentric circle: H ₁ ) is 0 or 1. The multi-row multi-conducting islands-in-the-sea composite fiber of Claim 1 whose fineness of a island component fiber is 0.001-0.3 denier. The multi-row multi-phase islands-in-the-sea composite fiber of Claim 1 in which the island component fiber of a thermoplastic resin consists of a polyester resin or a polyamide resin. The multi-row multi-phase islands-in-the-sea composite fiber according to claim 1, wherein the axisymmetric angle (θ) of the axisymmetric repeating unit (I) for separating island component fibers is 45 to 90 degrees. The multi-row polyphase islands-in-the-sea composite fiber of Claim 1 whose weight ratio of sea component and island component fiber in an island-in-sea composite fiber is 70: 30-10: 90.