KR101369035B1 - Conductive conjugated fiber with modified cross-section and fiber product using the same - Google Patents

Abstract

The present invention relates to a composite fiber comprising a sheath unit made of a fiber-forming resin and a core unit made of a thermoplastic resin containing conductive carbon black, and more specifically, to a conductive composite fiber with a modified cross section and a fiber product using the same for at least part of the fiber product, wherein the core unit containing conductive carbon black is formed in the shape of a triangle, a part connected to the outside of yarn is divided into three portions, and the three portions are exposed to three locations on the surface of a fiber. The composite fiber with a modified cross section of the present invention has improved conductivity, productivity, economical efficiency, and durability.

Description

CONDUCTIVE CONJUGATED FIBER WITH MODIFIED CROSS-SECTION AND FIBER PRODUCT USING THE SAME

The present invention relates to a conductive release cross-section composite fiber and a fiber product using the same, more specifically, the conductive release cross-section composite fiber composed of three parts connected to the outside of the yarn while symmetrical cross-section of the core portion and It relates to a textile product using it.

Synthetic fibers, such as polyamide and polyolefin, have evolved in the direction of providing unique functionality. Such functional characteristics include product development of garment materials having absorbency, deodorization, moisture permeability and antibacterial properties, and product development of industrial materials such as high strength and antistatic properties.

Conventionally, various kinds of conductive fibers having excellent antistatic performance have been proposed. For example, a method of fiberizing a polymer obtained by uniformly dispersing conductive carbon black has been proposed. However, since it contains a large amount of conductive carbon black, it is difficult to manufacture the fibers. The yield is also poor, the cost is expensive, and the fiber properties are remarkably lowered, and it is difficult to commercialize other than using a special process.

 As a technique for overcoming this problem, there is a method of manufacturing a conductive yarn in a sheath-core or split type composite spinning method. As shown in FIG. 1A, in the case of the sheath-core composite spinning, carbon black expressing conductivity is added to the core to impart electrical conductivity, or in the case of the split type, as shown in FIG. 1B, the outer or inner surface of the composite fiber. A method of providing electrical conductivity by placing carbon black on is used. However, in the method of containing carbon black in the yarn, existing technologies have a limitation in expressing excellent conductivity compared to the input amount because they do not escape the typical conductive carbon black input form.

In addition, if the conductive carbon black is exposed to the fiber surface too much, such as the four-point conductive yarn shown in Fig. 1c, the cost of the conductive carbon black increases and the manufacturing cost increases, and the yarn is separated from the carbon black in use. There is a problem that the durability is poor.

Accordingly, the present invention is to overcome the problems of the prior art described above, one object of the present invention is to provide a release cross-section composite fiber and fiber products using excellent fiber, excellent radiation and economical efficiency and durability To provide.

One aspect of the present invention for achieving the above object is a composite fiber composed of a sheath portion made of fiber-forming resin and a core portion made of thermoplastic resin containing conductive carbon black, The core portion containing the conductive carbon black has a triangular shape, and the portion connected to the outside of the yarn has three portions, and is exposed at three places on the fiber surface on the fiber cross section. will be.

Another aspect of the present invention for achieving the above object relates to a conductive release cross-section composite fiber product configured using at least a portion of the conductive release cross-section composite fiber of the present invention.

Conductive release cross-section composite fiber of the present invention is a high-performance conductive yarn improved by applying the existing sheath core form, the cross section of the core portion including carbon black symmetrical cross-linked to the outside of the yarn consists of three parts radioactive, economical It is a high performance conductive yarn with excellent conductivity, and no yarn separation during use, so that it can be deployed not only for clothing but also for various industrial fields.

Figure 1a-c is a schematic cross-sectional view of a conventional release cross-section composite fiber.
Figure 2a-c is a schematic cross-sectional view of a heteromorphic cross-section composite fiber of one embodiment of the present invention.

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

The present invention is a breakthrough in the separation of the electrical conductivity, radioactivity and yarn in use by manufacturing a three-point conductive yarn by inserting the portion containing the conductive carbon black in the form of a triangular heteromorphic cross section of the existing sheath-core type yarns The present invention relates to an improved conductive release cross-section composite fiber.

Figure 2a to 2c is a cross-sectional schematic diagram of a release cross-section composite fiber of one embodiment of the present invention. 2A to 2C, the conductive release cross-section composite fiber of the present invention is a composite fiber composed of a sheath portion 10 made of a fiber-forming resin and a core portion 20 made of a thermoplastic resin containing conductive carbon black. As the core portion 20 containing the conductive carbon black, a triangular or triangular pyramid shape is formed, and a portion connected to the outside of the yarn is composed of three portions, and is exposed at three places on the fiber surface on the fiber cross section. In the composite fiber of the present invention, since the carbon black-containing core portion 20 is exposed at three places on the fiber surface, high electric conductivity can be expressed by inducing a smooth current flow between the outside and the inside of the yarn, and conducting the entire surface of the fiber High uniformity is excellent. The core part 20 may have various shapes as shown in FIGS. 2A to 2C.

The core portion 20 containing carbon black in the present invention is wider toward the center of the fiber cross-section and narrower toward the fiber surface, it is configured to increase the content of the conductive carbon black toward the center of the core portion . In this way, the conductive carbon black content increases toward the center of the core portion, so that yarn yarn is easy and stable production and conductivity of superior performance are expressed, and the problem of yarn separation during use can be improved.

In addition, the exposure angle to the surface of the core portion 20 is preferably 40 ° or less with respect to 360 ° circumference of the composite fiber. If the exposure angle is in this range, the conductivity and productivity are good. The ratio of the cross-sectional area of the core portion 20 and the sheath portion 10 of the composite fiber of the present invention is that the ratio of the cross-sectional area of the core portion and the sheath portion is 5/95 to 95/5 in terms of productivity of spinning and post-processing workability. Do.

In the present invention, the core portion 20 has a carbon black content of 15 wt% or more and 50 wt% or less in the thermoplastic resin. The carbon black contained in the core part in this invention needs to have electroconductivity, and it is important that the electroconductivity which the said carbon black has is 5000 ohms / cm or less as a specific resistance value. Moreover, when it is contained in the fiber of this invention, since it is preferable not to impair fiber physical properties and to aggregate, it is preferable that the size of the particle | grains of electroconductive carbon black is the range of 1-500 nm in average particle diameter. Moreover, it is preferable that content of the carbon black in the said core part is 15 weight% or more and 50 weight% or less.

In the present invention, any method of adding an additive to the thermoplastic resin constituting the core portion 20 can be employed as a method of containing the carbon black in the core portion 20. Specifically, after melting (A) the core part, carbon black is added and kneaded by an extruder or kneader, (B) the core part and carbon black are dry blended in a predetermined ratio in advance, and then melted and kneaded. Method (C) In the polymerization reaction of the usual core portion, a method of kneading by containing conductive carbon black at any stage before the polymerization reaction is stopped is mentioned. Since the kneading can be easily achieved and the conductive carbon black and the core part component are kneaded more finely, the method of (A) or (B) is preferably employed.

In the present invention, the conductive release cross-section composite fiber has an average resistivity (P) of 2.0 × 10 ⁶ Ω / cm or less. The smaller the average resistivity is, the higher the conductivity is, that is, the easier it is to flow electricity. Therefore, it is necessary to have a low average resistivity depending on the application. If the average resistivity is within the above range, it can be applied as an antistatic material for various uses.

The thermoplastic resin constituting the core portion 20 in the present invention may be one or two or more selected from the group consisting of polyester, polyethylene, polypropylene, acrylonitrile butadiene styrene, polystyrene, polycarbonate and polyamide, It is not necessarily limited to these.

Subsequently, the fiber-forming polymer constituting the sheath portion 10 of the composite fiber of the present invention may be a fiber-forming polymer that can be melt-spun, for example, a polyester polymer, a polyamide polymer, a polyimide polymer, Vinyl polymers synthesized by addition polymerization of polyolefin polymers or other vinyl groups, fluorine polymers, cellulose polymers, silicone polymers, aromatic or aliphatic ketone polymers, elastomers such as natural rubber or synthetic rubber, and various other engineering plastics. Can be mentioned.

In addition, in this invention, the polymer which has the fiber forming ability which comprises the sheath part 10 in the range which does not impair the meaning of this invention may contain carbon black and / or another conductive material.

The composite fiber of the present invention is provided with a carbon black-containing core portion 10 and / or a sheath portion 20 having the fiber forming ability within a range that does not impair the gist of the present invention. Additives such as absorbers, infrared absorbers, nucleating agents, optical brighteners, and terminal group sealants may be further included.

The manufacturing method of the conductive release cross-section composite fiber of the present invention is not particularly limited, and can be produced by adopting a spinning method of various synthetic fibers such as solution spinning such as melt spinning, dry spinning, wet spinning, or dry wet spinning. . The carbon black-containing core portion 20 and the sheath portion 10 having fiber forming ability can be produced by using a conventional conjugated composite spinning device. It is possible to produce by a high speed spinning method such as spinning at a normal speed of 500 m / min to 1500 m / min, followed by stretching heat treatment, or a spin drawing method.

The fiber of this invention can be used as a woven fabric, a knitted fabric, and a nonwoven fabric, and can also be set as the cross section single-sided composite fiber product which uses at least one part of said composite fiber.

The release cross-section composite fiber and the fiber product using the same according to the present invention can be suitably used for various applications requiring excellent conductivity or for various applications requiring antistatic performance or charging performance. The release cross-section composite fiber according to the present invention can be used, for example, for medical purposes such as dustproof clothing, interior materials such as vehicle interior materials, wall materials for construction, carpets, floor coverings, and the like, and the high level required for these. Electroconductivity can be provided.

Example

Hereinafter, the present invention will be described in more detail with reference to Examples, but these are merely for illustrative purposes and should not be construed as limiting the present invention.

Example 1

Compound spinning nozzle for forming a triangular shaped cross-sectional shape as shown in Table 1 below, with 85% by weight of polyamide having an intrinsic viscosity of 3.0 and 15% by weight of polyamide containing conductive carbon black in the sheath. Melt-extruded through, and the spun composite yarn was cooled with air at 20 ℃ and then attached to the emulsion, and wound at a winding speed of 1,200m / min. After that, the stretching was carried out in a draw ratio of 1.7 in a three-stage drawing machine to measure the conductivity.

Example 2

A composite spinning nozzle for forming a triangular heteromorphic cross sectional shape shown in Table 1 below, wherein the polyamide having an intrinsic viscosity of 3.0 is 70% by weight and the polyamide containing conductive carbon black is 30% by weight. Melt extrusion was carried out, and the spun composite yarn was cooled with air at 20 ℃ and then the emulsion was attached, and wound at a winding speed of 700m / min. The conductivity was then measured by stretching at a draw ratio of 1.7 in a three-stage drawing machine.

Comparative Example  One

90% by weight of polyamide having an intrinsic viscosity of 3.0 in the sheath portion and 10% by weight of polyamide containing conductive carbon black in the core portion, through a composite spinning nozzle for forming a cross-sectional shape of a concentric type (one-point type). It was melt-extruded and the spun composite yarn was cooled with air at 20 ° C., then the oil was attached, and wound at a winding speed of 2,100 m / min. Thereafter, the resultant was stretched in a draw ratio of 1.7 in a three-stage stretching machine to prepare a stretched yarn, and then the conductivity of the stretched yarn was measured and shown in Table 1 below.

Comparative Example  2

80% by weight of polyamide having an intrinsic viscosity of 3.0 in the sheath portion and 20% by weight of polyamide containing conductive carbon black in the core portion are melted through a composite spinning nozzle to form a cross-sectional shape in the form of a 2-point (straight line) type. Extruded, the spun composite yarn was cooled with air at 20 ℃ then the emulsion was attached, and wound at a winding speed of 1,800 m / min. Thereafter, the stretched yarn was prepared by stretching at a draw ratio of 1.7 in a three-stage stretching machine, and then the conductivity of the stretched yarn was measured, and the results are shown in Table 1 together.

Comparative Example  3

70% by weight of polyamide having an intrinsic viscosity of 3.0 in the sheath portion and 30% by weight of polyamide containing conductive carbon black in the core portion, through a composite spinning nozzle for forming a heteromorphic cross-section in the form of a four-point (cross) type. It was melt extruded and the spun composite yarn was cooled with air at 20 ° C. and then the emulsion was attached and wound at a winding speed of 500 m / min. Thereafter, the stretched yarn was prepared by stretching at a draw ratio of 1.7 in a three-stage stretching machine, and then the conductivity of the stretched yarn was measured, and the results are shown in Table 1 together.

division Example
One Example
2 Comparative Example
One Comparative Example
2 Comparative Example
3 Compound yarn
Configuration
ingredient
(wt%) Shebu
(Polyamide) 85 70 90 80 70 Core portion
(With carbon black
Polyamide) 15 30 10 20 30
Composite yarn cross section

Radiation temperature (℃) 270 275 265 265 275 Cooling air temperature (℃) 20 20 20 20 20 Winding speed (m / min.) 1,200 700 1,900 1,100 500 Stretched yarn conductive
(Ω / cm) 7.5 × 10 ⁵ 3.2 × 10 ⁵ 7.8 × 10 ⁸ 6.4 × 10 ⁷ 2.4 × 10 ⁵ Maintain cross section maintain maintain maintain Partial separation part
detach

<Property evaluation method>

The physical property value in an Example was measured by the following method.

(1) Electroconductivity: The stretched yarn electroconductivity of Examples and Comparative Examples was carried out in the state of a composite fiber filament. Both ends of one strand of conductive yarn were fixed to a copper plate with a length of 10 cm, and the center portion was not in contact with the bottom, and the probes were contacted at both ends with 10 cm to measure electrical resistance at a voltage of 250V.

(2) Maintaining cross-sectional shape: One strand of the final conductive composite fiber filament, which was stretched 1.7 times, was immersed in an epoxy resin, fixed for 24 hours, cut in the yarn cross-section direction, and measured 2,000 times with an electron microscope (SEM) to measure the composite fiber. It was compared with the cross-sectional shape of.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments. This will be obvious.

10: sheath portion having fiber forming ability
20: core part containing carbon black

Claims (7)

A composite fiber composed of a sheath portion made of a fiber-forming resin and a core portion made of a thermoplastic resin containing conductive carbon black, wherein the core portion containing the conductive carbon black has a triangular shape and has three parts connected to the outside of the yarn. A conductive release cross-section composite fiber, characterized in that exposed to the fiber surface at three places on the fiber cross section.
The conductive release cross-section of claim 1, wherein the core portion is wider toward the center of the fiber cross section and narrower toward the fiber surface, and the content of the conductive carbon black is increased toward the center of the core portion. Composite fiber.
The cross-sectional ratio of the core portion and the sheath portion is 5/95 to 95/5, wherein the total length of the yarn surface exposure length of the triangular vertex of the core portion of the composite fiber is less than 10% of the outer diameter of the fiber outer diameter. A conductive release cross-section composite fiber, characterized in that the exposure angle to the surface of the core portion is 40 ° or less.
The conductive release cross-section composite fiber according to claim 1, wherein the core portion has a carbon black content of 15 wt% or more and 50 wt% or less in the thermoplastic resin.
The conductive release cross-section composite fiber according to claim 1, wherein the composite fiber has an average resistivity (P) of 2.0 × 10 ⁶ Ω / cm or less.
The conductive release cross-section composite according to claim 1, wherein the thermoplastic resin is at least one selected from the group consisting of polyester, polyethylene, polypropylene, acrylonitrile butadiene styrene, polystyrene, polycarbonate and polyamide. fiber.
A conductive release cross-section composite fiber product comprising at least a portion of the release cross-section composite fiber according to any one of claims 1 to 6.

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