KR100510767B1 - Conductive polyester fiber - Google Patents

Abstract

The present invention relates to conductive polyester fibers.

The conductive polyester fiber of the present invention is a polytrimethylene tere containing 15 to 40% by weight of the first component of a polyester resin having a trimethylene terephthalate group of 95 mol% or more and conductive carbon black having a particle size of 5 to 30 m μ . The second component of the phthalate resin is composite spun.

The weight ratio of the said 1st component: 2 component is 60: 40-90: 10.

Description

Conductive polyester fiber

The present invention relates to a polyester fiber excellent in conductivity.

In general, polyester fiber is widely used in the field of clothing, interior, industrial materials, etc. because of its excellent properties, the biggest drawback is the problem of generating static electricity. That is, polyester fibers tend to generate static electricity especially in winter compared to cotton, rayon, and the like, and have problems such as discharging sound on mirrors or winding them around the body. In order to solve the problem of generating static electricity of the fiber, a method of preventing the charging by imparting conductivity to the fiber itself or blending, teaching, or knitting the fiber imparted with the general fiber is performed. As a method of effectively imparting antistatic property to a fiber product, a method of forming an organic layer in which conductive fine particles are dispersed on a surface of a fiber, a method of fiberizing using a polymer in which a conductive metal is dispersed, and a third metal powder in a hollow portion of a fiber Has been proposed, but the first method is to shrink the fibers in advance to form a wrinkle on the surface of the fiber in order to improve the adhesion state of the organic layer, and the sensitizing process, activation process, plating process such as There are defects that require a lot of processes and advanced techniques, and the second method presents various difficulties in spinning process by adding metal, and the third method presents various difficulties such as the need to produce hollow fibers. .

In addition, as a method of solving the electrostatic generation problem, the method of mixing conductive carbon black with the whole fiber is problematic in terms of deterioration in radioactivity, strength and elongation. Furthermore, it is difficult to give black color to the entire fiber and deteriorate the appearance. In order to eliminate the drawbacks of the carbon black-containing conductive fibers, US Patent No. 3,803, 453 proposes a method of composite spinning with a component containing conductive carbon black as a core and a non-conductive polymer as a sequence. In this case by Shi seubu containing equal to or less than 50% of the anti-inflammatory agent (TiO ₂₎ for a total area ratio of the core portion containing the carbon black be black it is cut off relatively appearance is good. However, the composite form in which the core portion containing conductive carbon black is completely sealed in the sheath portion does not show satisfactory conductivity.

In order to solve this problem, Japanese Patent Laid-Open No. 51-143723 discloses a composite fiber in which the surface of the conductive component is exposed to some fiber surfaces. This is a composite form in which conductive conductive components are eccentric in the fiber cross section and part of which is discharged on the fiber surface, and is known to have superior conductivity as compared with the case where the electrically conductive core component is completely sealed to the non-conductive sheath component. However, since the matrix component containing carbon black is made of polyamide, the chemical resistance and heat resistance are inferior, and in the case of complex spinning of polyamide-based conductive resin and fiber-forming polyester-based resin, polyamide and polyester are incompatible. As a result, the phenomena of detachment of the conductive component often occur, resulting in poor operation, as well as carbonization of the conductive polyamide-based component due to an increase in spinning temperature, thereby making it impossible to continuously produce.

The present inventors seek to solve the problems of the prior art as described above and to provide a conductive polyester fiber having improved physical properties and conductivity.

The present invention is to provide a conductive polyester fiber with improved touch and conductivity while maintaining physical properties of polyester resins such as heat resistance and chemical resistance.

TECHNICAL FIELD This invention relates to the conductive polyester fiber excellent in electroconductivity, a touch, dyeability, alkali resistance, etc. More specifically, the present invention relates to a polytrimethylene terephthalate resin containing 15 to 40% by weight of the first component of the polyester resin having a trimethylene terephthalate group of 95 mol% or more and conductive carbon black having a particle size of 5 to 30 m μ . The present invention relates to a conductive polyester fiber in which a second component is combined.

The present invention is characterized in that a polytrimethylene terephthalate resin having excellent electrical properties and the like is used as the basic resin of the first component and the second component.

Hereinafter, the present invention will be described in detail.

First, in this invention, the polyester resin whose trimethylene terephthalate group is 95 mol% or more is used as a 1st component.

Next, polytrimethylene terephthalate prepared by polycondensation reaction of terephthalic acid or a derivative thereof and 1,3-propanediol with an additive of conductive carbon black having a particle size of 5 to 30 mμ in order to prepare a conductive polyester composite resin. Resin is used as a matrix component, and additives are uniformly blended in the matrix component to prepare a polyester-based carbon black master chip, which is used as the second component.

In the production of carbon black master chips, carbon black fine particles should be uniformly and continuously blended in the matrix component as much as possible. The most preferred method for this is the compounding of the polyester resin and the carbon black fine particles.

At this time, the carbon black fine particles are preferably milled to suppress secondary particle formation to the maximum, and the compounding machine is suitable for both a twin screw type and a general type. The supply method of carbon black is most advantageously supplied by a gear pump. It is advantageous to adjust the carbon black component ratio in the master chip to 15 to 40% by weight in terms of conductivity, radioactivity and economy. Since the polytrimethylene terephthalate used in the present invention has a higher process moisture content than the conventional polyethylene terephthalate resin and has excellent electrical characteristics, the carbon black component ratio in the master chip can be lowered than before. Therefore, the present invention can not only reduce manufacturing costs but also minimize the deterioration of physical properties of the yarn due to the addition of carbon black. This is a test result of the present inventors. If the carbon black content in the fiber is less than 1.5% by weight, the conductivity is extremely poor, and when the content exceeds 16% by weight, the conductivity is saturated. Inadequate in terms of

If the content of carbon black in the carbon black master chip is less than 15% by weight, it is difficult for the carbon black to be present in a uniform continuous phase in the matrix, and when it exceeds 40% by weight, it is economically unsuitable. In addition, when the size of the carbon black exceeds 30 mμ is good dispersibility, but the content ratio should be increased, when less than 5 mμ is difficult to crush and difficult to disperse. Therefore, the particle size of the carbon black is preferably 5-30 mμ.

If carbon black is added in the polymerization step of the polyester resin, it may not obtain desirable functionality and productivity due to a decrease in the degree of polymerization, a decrease in content and poor operation, and the polyester resin and carbon black fine particles may be mixed in the spinning step. When spinning, the conductivity is extremely low, and uniform physical properties and good operability are not obtained. The first component of the polyester resin having a second component and a trimethylene terephthalate group prepared as described above is at least 95 mol% in each extruder, and then melted in each extruder to produce a two component composite conductive polyester fiber through a composite spinning device.

At this time, the cross-sectional shape of the two-component composite conductive fiber is a concentric cross-sectional structure in which the first component is the sheath of the fiber and the second component is the core of the fiber as shown in FIG. 2, or the first component as shown in FIG. 4. The component is a core of fiber and the second component is a concentric circular cross-sectional structure in which the fiber is in phase, or the second component is eccentrically positioned with respect to the first component as shown in FIGS. 1 and 3, and the second component is placed on the fiber surface. It may have an eccentric cross-sectional structure exposed 10 to 50%.

Such a cross-sectional change can be freely formed by a conventional method of changing the connection position of the holding hole and the distribution plate in the holding plate in the holding device. Although the component ratio of the two-component composite conductive polyester fiber can be adjusted from 97: 3-5: 95 by weight of the first component: second component, the functional component of the first component: second component It is preferable to make it 60: 40-90: 10. At this time, the carbon black content ratio in the fiber is preferably 1.5 to 16% by weight.

The two-component composite conductive polyester non-drawn yarn prepared as described above can be used as a filament by stretching by a general drawing method, or can be prepared as a single fiber staple after tow stretching by forming a non-drawn yarn in a tow shape. By using the two-component composite conductive polyester partially drawn yarn may be prepared and then stretched to produce a stretch yarn, or ultra-fast spinning to produce a completely drawn yarn. In addition, in the manufacturing process of other processed yarns, undrawn yarn, partially drawn yarn, drawn yarn, and the like may be mixed directly in the process to produce a special conductive yarn.

Since the conductive polyester fiber of this invention has polytrimethylene terephthalate which is excellent in electrical property as a main component, it is especially excellent in electroconductive function, and the durability and chemical-resistance peculiar to polyester are maintained.

In addition, the conductive polyester fiber of the present invention has a low initial modulus and is excellent in touch, and has excellent alkali resistance and dyeing property, and thus may be used for industrial as well as apparel fields.

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

Polytrimethylene terephthalate resin having a trimethylene terephthalate group of 98 mol%, a polyester having an intrinsic viscosity of 0.65 and a TiO ₂ content of 3,000 ppm as a first component, and having an intrinsic viscosity of 0,65 and a TiO ₂ content of 700 ppm A polyester-based carbon black master chip obtained by uniformly dispersing 20% by weight of carbon black having a particle size of 15 mμ in (metrics resin) is used as a second component.

After supplying the first component and the second component to a conventional composite spinning device in a weight ratio of 80:20, and then composite spinning them at a spinning speed of 1,350m / min to give 180 denier undrawn yarn having a cross-sectional shape as shown in FIG. Manufacture. At this time, the extrusion temperature of the two spinners is the same, and the temperature of the spin block is 290 ° C. The carbon black content in the prepared non-drawn yarn is 4% by weight, and the fiber surface exposure rate averages about 20% with respect to the outer periphery of the fiber cross section.

The stretched yarn of 60 denia 6 filament was prepared by stretching at a draw ratio of 3.0 while supplying a hot roll of 85 ° C. and a hot plate of 135 ° C. among the prepared non-drawn yarns. Table 2 shows the results of measuring the specific resistance, half-life, touch, alkali resistance and dyeing resistance of the prepared yarn.

Example 2-Example 4 and Comparative Example 1

A stretched yarn is manufactured in the same process and conditions as in Example 1, except that the cross-sectional shape of the fiber, the particle size and content of the carbon black, and the kind of the first component and the second component are changed as shown in Table 1. The results obtained by measuring the specific resistance, half-life, touch, alkali resistance and dyeing resistance of the drawn yarn are shown in Table 2.

<Table 1> Stretched yarn manufacturing conditions

<Table 2> Physical property measurement result

The conductive fiber of the present invention has excellent conductivity and alkali resistance while maintaining inherent properties of the polyester resin such as heat resistance and chemical resistance. In addition, it has excellent touch and dyeing ability, and can be used as a yarn for clothing.

1 to 4 are enlarged cross sectional views of the conductive polyester fibers produced by the present invention.

* Explanation of symbols for the main parts of the drawings

a: second component (conductive component), b: first component (non-conductive component)

Claims (2)

The first component of the polyester resin having a trimethylene terephthalate group of 95 mol% or more and the second component of the polytrimethylene terephthalate resin containing 15 to 40% by weight of conductive carbon black having a particle size of 5 to 30 μm are complex. Conductive polyester fibers. The conductive polyester fiber according to claim 1, wherein the weight ratio of one component to two components is 60:40 to 90:10.