KR20010047525A - A multi-hollow fiber, and a process of preparing for the same - Google Patents

Abstract

PURPOSE: A process for preparing multiple hollow fiber comprising polyester or polyamide resin and having 5 to 100 hollow parts in a concentric circle shape on a fiber cross section is provided. Thereby, the fiber can improve light weight property, tensile strength and tear strength such that it can be used for the manufacture of artificial leather for shoes, bags, wallets or the like. CONSTITUTION: This fiber is prepared by a process consisting of: composite-spinning and drawing an alkali readily soluble polymer as island components and polyamide or polyester as sea components in such a manner that 5 to 100 island components having a fiber cross shape exists in sea components in a concentric circle shape to produce sea-island type conjugate fiber; and the island components of the sea-island type conjugate fiber are subjected to elution with an alkali aqueous solution.

Description

Multi-hollow fiber, and a process of preparing for the same

The present invention relates to a multi-hollow fiber and a method for manufacturing the same, which can improve physical properties such as lightness, tensile strength and tear strength in the manufacture of artificial leather.

Conventionally, hollow fibers having one hollow portion on a fiber cross section as in FIG. 1 have been mainly used as yarn for artificial leather production. As the hollow fiber, Korean Unexamined Patent Publication No. 1998-71556 proposes a hollow fiber composed of a polyester resin having a single yarn fineness of 0.1 to 8.0 denier, a hollow ratio of 40 to 85%, and a crystallinity of 20% or more.

The hollow fiber is manufactured by extruding a polyester resin through a special spinneret capable of forming a hollow part, and then rapidly cooling the spinneret directly under the spinneret, and stretching it at a draft ratio of 200 to 400 and winding it at a winding speed of 1000 to 1800 m / min. It was.

Thus, since the conventional hollow fiber is manufactured by a manufacturing method of quenching and then quenching under a direct detention, not only a special cooling device is required, but also a special spinning facility for forming a hollow part has a complicated problem.

In addition, since only one hollow part exists in the conventional hollow fiber, deformation and damage of the hollow part may occur due to roller compression during a process such as needle punching or polyurethane impregnation when manufacturing the nonwoven fabric. As a result, the lightness of the artificial leather is deteriorated and mechanical properties such as tensile strength and tear strength are also weakened.

This problem is more serious because the hollow part in the conventional hollow fiber exists in a hollow state immediately after spinning.

An object of the present invention is to provide a multi-hollow fiber that can improve the mechanical properties such as light weight and tensile strength and tear strength of the product in the manufacture of artificial leather by solving these problems.

The present invention is to provide a multi-hollow fiber is particularly useful in the manufacture of artificial leather excellent in mechanical properties such as light weight and tensile strength and tear strength. In another aspect, the present invention is to provide a method capable of manufacturing the multi-hollow fiber with a simple manufacturing apparatus.

1 is a cross-sectional state diagram of a conventional hollow fiber.

Figure 2 is a cross-sectional state diagram of the present invention multiple hollow fiber.

※ Explanation of the main parts of the drawings

1 hollow part 2 fiber polymer

The present invention relates to a porous hollow fiber mainly used as a yarn for manufacturing artificial leather and a manufacturing method thereof.

More specifically, the present invention is composed of a polyester or polyamide resin, 5 to 100 concentric circular hollows on the fiber cross-section, the proportion of the hollow area to the fiber cross-sectional area is 35 to 75% by weight, single yarn fineness It relates to a multiple hollow fiber, characterized in that 0.1 to 6.0 denier.

In addition, the present invention is an island-in-the-sea composite by using the alkali-soluble polymer as a island component and polyamide or polyester as a sea component, so that the island components on the fiber cross-section is 5 to 100 concentric in the sea component After preparing the fiber, the present invention relates to a method for producing a multi-hollow fiber, characterized in that the island-in-the-sea component of the island-in-the-sea composite fiber is eluted.

Hereinafter, the present invention will be described in detail.

First, in the conventional islands-in-the-sea composite fiber spinning apparatus, an alkali-soluble polymer is supplied as a island component, and polyamide or polyester is supplied as a sea component so that the island components exist in the form of a plurality of concentric circles in the sea cross-section. . At this time, as the usable polymer, it is preferable to use polyethylene terephthalate in which 3 to 20 mol% of at least one compound selected from isophthalic acid, 5-sodium sulfoisophthalic acid and ethylene glycol are copolymerized. The alkali solubility of the water-soluble polymer is five times better than that of ordinary polyester.

In the case of complex spinning, 5 to 100 dispersions of concentric islands are dispersed in sea components. More preferably, 15 to 70 dispersed arrangements are advantageous for the complete dissolution of the island component. The weight ratio of the elution component (figure component) in the fiber cross section is preferably set to 35 to 70% by weight. More preferably, it is 40 to 60 weight%.

The present invention can use the existing island-in-the-sea ultra-fine composite spinning device as it is, there is no need to provide a separate spinning pack or cooling device.

Next, the island-in-the-sea composite fiber in which the single yarn fineness is 0.5 ~ 6.0 denier is prepared by stretching or tow stretching the conjugated islands-in-sea composite fiber. Upon removal, multiple hollow fibers of the present invention are produced.

It looks at the method of manufacturing artificial leather with islands-in-the-sea composite fiber spun by the method of the present invention.

First, tow-stretched the composite spun island-like composite fibers to prepare staple-like short fibers, and then carded and needle punched to prepare a nonwoven fabric of 300 ~ 600g / ㎡. In the production of nonwoven fabrics, conventional nylon or polyester staples may be mixed in an amount of about 10 to 50% by weight.

Since the hollow part is not yet present in the staples constituting the nonwoven fabric at the time of needle punching, in other words, since the island component and the sea component are still present, there is no problem that the conventional hollow part is deformed and broken.

When the nonwoven fabric is treated with an alkaline aqueous solution of 5 to 10% concentration, the short fibers constituting the nonwoven fabric are eluted components among them to become the multiple hollow fibers of the present invention. After the nonwoven fabric composed of multiple hollow fibers is treated with a 10% polyvinyl alcohol solution, it is dipped into a 9-15% polyurethane solution and impregnated into a polyurethane nonwoven fabric. Polyvinyl alcohol solution treatment is carried out to form voids during polyurethane impregnation.

Subsequently, the polyurethane-impregnated nonwoven fabric is buffed with sandpaper of 200 to 600 mesh, and a coating layer is selectively formed thereon to prepare artificial leather. The alkaline aqueous solution treatment may be carried out after the polyurethane impregnation step. When the alkaline aqueous solution treatment is performed before the polyurethane impregnation process, the physical properties are excellent but the feel is poor. When the alkali solution is treated after the polyurethane impregnation process, the feel is improved but the physical properties are somewhat reduced.

Artificial leather made of the multi-hollow fiber of the present invention is very excellent in light weight, excellent in mechanical properties such as tensile strength is very useful as artificial leather for sneakers, shoes, shoes, artificial leather for bags, wallets and other goods.

Porous fiber of the present invention eluted by alkaline solution treatment is composed of polyester or polyamide resin, and 5 to 100 concentric circles are formed on the fiber cross section, and the hollow portion area ratio is 35 to the fiber cross section. 75 weight%, single yarn fineness is 0.1-6.0 denier.

In the present invention, the physical properties of artificial leather are measured by the following method.

Elution component weight ratio

The fiber weight before and after the elution of the island component is measured and calculated.

Artificial leather weight

Measure four times with KSK 0514 method to get the average value.

After artificial leather

Measure four times with KSK 0506 method to get the average value.

Artificial leather tensile strength and elongation at break

The length and width tensile strength and the elongation at break of artificial leather are measured by KSK 0520 method.

Artificial leather tear strength

The length and width tear strength of artificial leather are measured by KSK 0536 method.

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

Polyamide having a relative viscosity of 2.55 as a sea component, copolymerized polyethylene terephthalate copolymerized with 5 mol% of isophthalic acid in a solution of 0.55 intrinsic viscosity in a 25 ° C solution of orthochlorophenol, and a conventional island-in-the-sea composite spinning Compound spinning with the device. At this time, the weight ratio of sea component and island component is 50:50, and 16 island components in sea component are arranged in concentric circles.

Unstretched yarn is prepared by winding the spun island-like composite fiber at a winding speed of 1000 m / min, and drawn and cut at a draw ratio of 3.50 times to prepare staples having a single yarn fineness of 3.0 denier and a length of 51 mm. Carding and needle punching the staples to produce a non-woven fabric of 420g / ㎡, it is treated with an aqueous alkali solution of 10% concentration to elute the coating component in the nonwoven fabric.

Subsequently, the nonwoven fabric is treated with a 5% polyvinyl alcohol solution and then dipped into an ester-based polyurethane solution to impregnate 33% by weight of polyurethane. Subsequently, these surfaces and the back surface are buffed twice each with 300 mesh sandpaper to produce artificial leather. The results of evaluating the physical properties of the manufactured artificial leather are shown in Table 2.

Example 2-Example 8 and Comparative Example 1

Artificial leather is manufactured by the same process and conditions as in Example 1 except for changing the manufacturing conditions as shown in Table 1. The results of evaluating the physical properties of the manufactured artificial leather are shown in Table 2.

<Table 1> Manufacturing Conditions

division Sea component: Island component weight ratio (fiber forming component: eluting component) Hollow Part Number Nonwoven Weight Sea Ingredient Polymer (Fiber Forming Polymer) Example 1 50:50 16 420g / ㎡ Polyamide Example 2 60:40 16 420g / ㎡ Polyamide Example 3 40:60 16 420g / ㎡ Polyamide Example 4 50:50 36 420g / ㎡ Polyamide Example 5 50:50 16 420g / ㎡ Polyester Example 6 50:50 16 420g / ㎡ Polyester Example 7 60:40 16 420g / ㎡ Polyester Example 8 40:60 36 420g / ㎡ Polyester Comparative Example 1 -(Without eluent) One 200g / ㎡ Polyester

<Table 2> Property Measurement Results

division Weight (g / ㎡) Thickness (mm) Tensile Strength <Length / Width> (kg / cm) Cutting Elongation <Length / Width> (%) Tear strength <length / width direction> (kg) Example 1 299.5 1.20 9.8 / 12.1 68/90 4.3 / 3.0 Example 2 323.6 1.25 10.2 / 13.4 76/102 5.0 / 3.9 Example 3 275.4 1.17 8.4 / 10.5 61/77 3.7 / 2.5 Example 4 295.1 1.21 8.5 / 11.1 58/78 4.0 / 2.6 Example 5 295.2 1.23 8.8 / 6.8 58/77 3.7 / 2.9 Example 6 320.2 1.28 9.1 / 7.3 65/81 4.0 / 3.3 Example 7 270.4 1.19 8.5 / 6.1 52/64 3.2 / 2.1 Example 8 298.3 1.23 8.2 / 6.5 49/58 3.6 / 2.6 Comparative Example 1 302.2 0.85 8.1 / 5.9 87/132 2.3 / 2.6

In the multi-hollow fiber of the present invention, the hollow portion does not exist on the fiber cross section until the eluted component (equivalent component) is eluted by the alkali reduction process. As a result, the hollow part is not deformed or damaged by the pressure of the pressing roller during impregnation of the needle or polyurethane during artificial needle manufacturing. This improves the lightness of the final product artificial leather, and also improves mechanical properties such as tensile strength and tear strength. In addition, the production method of the present invention can be produced in a simple device of the multiple hollow fiber.

Claims (3)

Consisting of polyester or polyamide resin, 5 to 100 concentric circles on the fiber cross section, 35 to 75% by weight of hollow area to fiber cross section, 0.1 to 6.0 denier Characterized by multiple hollow fibers. The island-in-the-sea composite fiber was prepared by using the alkaline-soluble polymer as a island component and polyamide or polyester as a sea component, and the fiber components were spun and stretched so that 5 to 100 of the island components in the sea section exist concentrically. Next, a method of producing a multi-hollow fiber, characterized in that eluting the island component of the island-in-the-sea composite fiber with an aqueous alkali solution. The method for producing multiple hollow fibers according to claim 2, wherein the alkali-soluble polymer is polyethylene terephthalate copolymerized with 3 to 20 mol% of isophthalic acid, 5-sodiumsulfoisophthalic acid and / or ethylene glycol.