KR20110078416A - Electrically conductive conjugated fiber of cross-shape, and preparation method thereof - Google Patents

Abstract

PURPOSE: A cross-shaped electrically conductive conjugate fiber and a manufacturing method thereof are provided to maintain antibiosis by enlarging a contact area of thermoplastic resin and filler, and to improve electric conductivity of conjugate yarn. CONSTITUTION: The cross-shaped electrically conductive conjugate fiber includes nano silver of 1.0 - 2.5% weight and flowing layer multi-walled carbon nanotube of 1.0 - 1.5% weight compared to the whole weight of the conjugate fiber. cross-shaped electrically conductive conjugate fiber includes one kind or at least two kinds of thermoplastic resin selected in a group consisting of polyester, polyethylene, polypropylene, acrylonitrile butadiene styrene, polystyrene, polycarbonate, polyamide.

Description

Cross-conductive composite fiber and its manufacturing method {Electrically conductive conjugated fiber of cross-shape, and preparation method}

The present invention relates to a conductive composite fiber having a cruciform structure and a method of manufacturing the same, and more particularly, to a cross-shaped core part including 1.0 to 2.5 wt% of nano silver and 1.0 to 1.5 wt% of a fluidized-bed multi-walled carbon nanotube based on the total weight of the composite fiber. It relates to a cross-shaped conductive composite fiber and a method of manufacturing the same.

Polymer resins frequently cause problems such as charging, heat deformation, abrasion, corrosion, cracking, and breakage, and have been used to make a composite by mixing additives to solve this problem.

In particular, synthetic fibers such as polyamide fibers and polyethylene terephthalate fibers generally have the disadvantage of generating static electricity and being easy to charge. In order to overcome these drawbacks, techniques for making the synthetic fibers conductive have been studied.

Conductive composite fibers are widely used as materials that provide antistatic performance by mixing them in textile products such as carpet or dust-free. On the other hand, in order to prevent malfunction of the computer due to static electricity, the carpet installed in the room requires a higher level of conductivity than the general carpet. For applications in which such highly conductive fibers are required, fibers having a conductive layer exposed to the fiber surface (JP-A 57-25647) and post-processed conductive fibers or metal fibers produced by coating a conductive material on the fiber surface are used.

Conventionally, many studies have been conducted through the addition of fillers such as carbon black, carbon fiber, steel fiber, and silver flake to improve the electrical properties of polymer resins. To improve, there is a problem that too much expensive filler is required.

Among the fibers, the composite fiber having the conductive layer exposed is carbon desorbed from the composite fiber running during weaving and post-processing, and the processability is poor. In addition, there is a problem that the conductive material coated with the post-processing conductive fiber is easy to fall off, and the metal fiber has a problem that the fiber is fibrillated during use, which makes it difficult to be practical.

In addition, the conventional method, there is a method of placing a conductive material such as carbon black and carbon fiber in the center, that is, a method of manufacturing a core-shell structure, which requires a large amount of fillers, such as carbon fiber, which is an uneconomical process There is a problem.

On the other hand, in the modern society, many efforts have been made to improve the performance of the electrically conductive fibers and to apply them to the interior of the clothes. A new concept of clothing that combines mechanical functionality is in the limelight.

In the present invention, the functional aspect of the present invention has received much attention for its various features including antibacterial activity, but its own filler does not provide sufficient electrical conductivity by adding a small amount of silver nanoparticles to carbon nanotubes having excellent mechanical strength and heat resistance, To reduce the disadvantages and increase the contact area between the thermoplastic resin and the filler to maintain the antimicrobial properties and to improve the electrical conductivity of the composite yarn.

The present inventors use fluidized bed multi-walled carbon nanotubes to impart electrical conductivity and antimicrobial properties to the fibers using multi-walled carbon nanotubes and silver nanoparticles, and use a cross-shaped nozzle during melt spinning. The present invention was completed by making the fibers.

In order to solve the problems of the prior art as described above, the present invention is characterized in that the cross-shaped core having a cross-shaped core including 1.0 to 2.5% by weight and 1.0 to 1.5% by weight of the fluidized bed multi-walled carbon nanotubes relative to the total weight of the composite fiber An object of the present invention is to provide a conductive composite fiber and a method of manufacturing the same.

In order to achieve the above object, the present invention is a conductive composite fiber having a cross-shaped structure, having a cross-shaped core including 1.0 to 2.5% by weight of nano silver and 1.0 to 1.5% by weight of fluidized bed multi-walled carbon nanotubes relative to the total weight of the composite fiber Provided is a cross-shaped conductive composite fiber characterized by.

The present invention also characterized in that the cross-shaped conductive composite fiber comprises one or two or more thermoplastic resins selected from the group consisting of polyester, polyethylene, polypropylene, acrylonitrile butadiene styrene, polystyrene, polycarbonate, polyamide Provided is a cross-shaped conductive composite fiber.

The present invention also provides a method for producing a conductive composite fiber having a cross-shaped structure, by melt-compositing a fluidized bed multi-walled carbon nanotube bonded with nano silver together with a thermoplastic resin at a spinning temperature of 280 to 350 ° C. using a cross nozzle. To provide a method for producing a cross-shaped conductive composite fiber, characterized in that having a cross-shaped core including 1.0 to 2.5% by weight and 1.0 to 1.5% by weight of the fluidized bed multi-walled carbon nanotubes relative to the total weight of the composite fiber.

The present invention is to improve the shortcomings of the prior art by using a nano-bonded carbon nanotube melt spinning with a thermoplastic resin using a yarn to use a smaller amount of filler than a conventional core-shell composite yarn In addition, there is an effect of providing a cross-shaped conductive composite fiber and a method of manufacturing the same to maximize the electrical conductivity.

In particular, the carbon nanotubes, which are fillers of the conductive composite yarn, have the effect of improving the process economy compared to the case of the conventional multi-walled carbon nanotubes or single-walled carbon nanotubes using fluidized bed multi-walled carbon nanotubes. In addition, by using silver nanoparticles together with the fluidized bed multi-walled carbon nanotubes as a filler, it has the effect of maximizing electrical conductivity and providing antimicrobial properties.

Hereinafter, the present invention will be described in detail.

In order to achieve the above object, the cross-shaped conductive composite fiber of the present invention is characterized by having a cross-shaped core including 1.0 to 2.5% by weight and 1.0 to 1.5% by weight of fluidized bed multi-walled carbon nanotubes relative to the total weight of the composite fiber. .

Carbon nanotubes are not particularly limited, but the carbon nanotubes used in the present invention are multi-walled carbon nanotubes produced in fluidized bed equipment, and have different characteristics from those of conventional carbon nanotubes. This is manufactured by using a catalyst manufactured by Hyosung Co., Ltd., which is about 1/3 to 1/5 lighter than that of foreign carbon nanotubes. will be. In the case of using this, the manufacturing cost is very low compared to the general multi-walled carbon nanotubes as well as the single wall, thereby having an excellent effect on economics and commercialization.

Looking at the process of the multi-walled carbon nanotubes first to prepare a catalyst. The process of making the catalyst consists of solvent preparation, precipitation, distilled water removal, drying, and grinding, in which the catalyst also contains metal components. Generally, there are four types of reagents used in the production of catalysts, which occur during the process of blending them. These metal components are divided into necessary components and unnecessary components, and these unnecessary phases can be eliminated by changing the drying method in the drying part of the catalyst manufacturing process. The drying method used in this patent uses spray drying, which removes some of the metal due to its high temperature as it dries. Therefore, the density of the catalyst is reduced, thereby reducing the density of the multi-walled carbon nanotubes.

The present invention is a modification of the cross section of the conventional carbon nanotube composite yarn, and relates to a method for producing a cross-conductive composite fiber by bonding silver nanoparticles of a certain size and shape to the carbon nanotube and melt spinning it using a cross nozzle. will be. Unlike conventional composite yarns, two types of conductive fillers are applied, the cross section of the composite yarns is cross-shaped, and the electrical conductivity is realized by using a smaller amount of filler than the composite yarns of the existing core-shell structure.

More specifically, the present invention relates to a method of implementing a thermoplastic resin composite yarn having conductivity by simultaneously applying silver nanoparticles and fluidized bed multi-walled carbon nanotubes as a filler, and having the cross-shaped structure inside the fiber. When both materials are used as fillers, sufficient electrical conductivity can be obtained even by adding a smaller amount of filler compared to the amount of fillers added in order to realize electrical conductivity. In addition, if the cross-section instead of the existing core-shell structure has less filler than the existing core-shell structure, it is possible to realize the economical efficiency of the process, easy sacrificial.

1 shows a cross section of a composite yarn according to the present invention. According to the present invention, the silver particles 11 are bonded to the carbon nanotubes 12, mixed with the thermoplastic resin 13, and spun together to obtain an effect of improving the electrical conductivity of the composite yarn even when the content of expensive silver nanoparticles is small. To make it possible. In addition, the cross-shaped structure of the composite yarn allows the use of less fillers compared to the conventional core-shell structure.

The cross-shaped conductive composite fiber of the present invention has a cross-shaped core including 1.0 to 2.5 wt% of nano silver and 1.0 to 1.5 wt% of a fluidized-bed multi-walled carbon nanotube based on the total weight of the composite fiber.

The cross-shaped conductive composite fiber includes a thermoplastic resin.

Thermoplastic resins that can be used in the present invention include, but are not limited to, one or two or more selected from the group consisting of polyester, polyethylene, polypropylene, acrylonitrile butadiene styrene, polystyrene, polycarbonate, and polyamide. More preferably, one or two or more selected from the group consisting of polyesters, polyethylenes, polypropylenes and polyamides are used, and most preferably polyamides are used.

Silver nanoparticles are to provide antimicrobial properties by destroying the metabolism of microorganisms, and silver nanoparticles are prepared by a method called sol-gel method. That is, the surfactant and the silver nitrate solution containing the hydroazine is stabilized by mixing, it is prepared by the method of extracting only the silver component. The size of the silver nanoparticles prepared is generally 20 to 100 nm, more preferably using a fine silver component powdered to 40 to 80 nm. At this time, when using nano silver particles of less than 20 nm, there is a problem that agglomeration occurs a lot by the principle of van der Waals force of the nano silver particles, and when using more than 100 nm particles, the particle size is too large to achieve the desired function Can't expect

In addition, the amount of nano silver added is preferably 1.0 to 2.5% by weight of nano silver based on the total weight of the composite fiber. In this case, less than 1.0% by weight is insufficient in the final composite fiber, when the content of more than 2.5% by weight is difficult in the trimming and post-process, as well as difficult to achieve economic benefits.

The fluidized bed multi-walled carbon nanotubes are preferably 1.0 to 1.5% by weight based on the total weight of the composite fiber. If the amount is less than 1.0% by weight, the surface resistance value of the composite yarn manufactured is low, and the electrical properties thereof are poor. Compared to the conductive filler of economical efficiency is a problem.

In the method of manufacturing a cross-shaped conductive composite yarn, the present invention uses a method of spinning carbon nanotubes bonded with silver particles together with a thermoplastic resin using a cross nozzle.

At this time, the spinning temperature is preferably 280 to 350 ℃. If the spinning temperature is less than 280 ° C., the thermoplastic resin is not sufficiently melted, and thus electrical conductivity is not sufficiently exhibited. If the spinning temperature is higher than 350 ° C., the resin is deteriorated.

Hereinafter, the present invention will be described in more detail with reference to Examples and Comparative Examples.

[Examples and Comparative Examples]

The fluidized bed multi-walled carbon nanotubes to which nano silver were bonded were melt-bonded together with polyamide using a cross nozzle at a spinning temperature of 300 ° C. Comparative Example 2 was spun using a non-cross core-shell nozzle, Comparative Example 3 was carried out using a single-wall carbon nanotubes.

TABLE 1

(◎: Very good, ○: Good. △: Not good.)

1 is an enlarged cross sectional view of a cross-shaped conductive composite fiber produced according to the present invention.

Claims (3)

Conductive composite fiber having a cross structure, Cross-shaped conductive composite fiber, characterized in that it has a cross-shaped core comprising 1.0 to 2.5% by weight and 1.0 to 1.5% by weight of fluidized bed multi-walled carbon nanotubes relative to the total weight of the composite fiber. The method of claim 1, The cruciform conductive composite fiber includes a cruciform conductive composite comprising at least one thermoplastic resin selected from the group consisting of polyester, polyethylene, polypropylene, acrylonitrile butadiene styrene, polystyrene, polycarbonate, and polyamide fiber. In the method for producing a conductive composite fiber having a cross structure, Fluidized-bed multi-walled carbon nanotubes bonded with nano silver were melt-composited together with thermoplastic resin using a cross nozzle at a spinning temperature of 280 to 350 ° C., so that 1.0 to 2.5 wt% of nano silver and a fluidized-bed multi-wall based on the total weight of the composite fiber. Method for producing a cross-shaped conductive composite fiber, characterized in that it has a cross-shaped core portion containing 1.0 to 1.5% by weight carbon nanotubes.

Images