KR-20260067942-A - Method and Apparatus for Producing Conductive Fibers through Dry Spinning

KR20260067942AKR 20260067942 AKR20260067942 AKR 20260067942AKR-20260067942-A

Abstract

The present invention is a technology for manufacturing conductive fibers by mixing a conductive filler and a thermoplastic polymer through a dry spinning process, which overcomes the limitations of complex wet spinning methods and enables the production of conductive fibers more simply and efficiently. The present invention forms high-quality fibers with uniform conductivity by optimizing the filler content and the volatilization conditions of volatile solvents, and by introducing a dual volatilization zone to ensure the continuity and uniformity of the fibers, it is possible to manufacture high-efficiency conductive fibers that can be used in various electrical conductivity applications.

Inventors

문소윤
주영준
김만태
임형미

Assignees

한국세라믹기술원

Dates

Publication Date: 20260513
Application Date: 20241227
Priority Date: 20241106

Claims (8)

(a) a step of preparing a mixture comprising a thermoplastic polymer resin, a conductive filler, and a volatile solvent soluble in the thermoplastic polymer resin; (b) a step of extruding the above mixture through a nozzle; (c) a step of forming a conductive fiber by passing the mixture through a double volatilization zone in which volatilization of the volatile solvent occurs while the mixture is being spun; comprising, Method for manufacturing conductive fibers through dry spinning.
In Article 1, The above thermoplastic polymer resin is 3 to 30 volume% of the total 100 volume% of the mixture, and The conductive filler is 13 to 45 volume% of the total 100 volume% of the mixture, and The above volatile solvent is characterized as being 50 to 70 volume% of the total 100 volume% of the mixture. Method for manufacturing conductive fibers through dry spinning.
In Article 1, The above thermoplastic polymer resin is, Comprising at least one selected from the group consisting of poly(methyl methacrylate, PMMA), polyketone (PK), silicone (Si), polycarbonate (PC), polystyrene (PS), polyethylene terephthalate (PET), polyethylene (PE), acrylonitrile butadiene styrene (ABS), nylon (PA-Polyamide), polypropylene (PP), and polyurethane (PU). Method for manufacturing conductive fibers through dry spinning.
In Article 1, The above conductive filler is, It comprises at least one of a metal or carbon-based material, and The above metal comprises at least one selected from the group consisting of gold, silver, copper, aluminum, and nickel, and The above carbon-based material comprises at least one selected from the group consisting of graphite, carbon nanotubes, graphene nanoplatelets, carbon black, and expanded graphite. Method for manufacturing conductive fibers through dry spinning.
In Article 1, The above volatile solvent is, The vapor pressure is 20 to 50 kPa, and Comprising at least one selected from the group consisting of acetone, methyl ethyl ketone, ethanol, isopropyl alcohol, and toluene, Method for manufacturing conductive fibers through dry spinning.
In Article 1, The above dual volatile zone is, A primary volatilization zone set at a location 5 to 10 cm away from the nozzle while maintaining a temperature 100 to 250°C higher than the boiling point of the volatile solvent, and A secondary volatilization zone set at a location 5 to 30 cm away from the primary volatilization zone, maintaining a temperature 1 to 20°C higher than the boiling point of the volatile solvent. Method for manufacturing conductive fibers through dry spinning.
(a) a nozzle for extruding a mixture comprising a thermoplastic polymer resin, a conductive filler, and a volatile solvent; and (b) a dual volatilization zone through which a mixture extruded from the nozzle passes to produce a conductive fiber; comprising, The above dual volatile zone is, A primary volatilization zone set at a location 5 to 10 cm away from the nozzle while maintaining a temperature 100 to 250°C higher than the boiling point of the volatile solvent, and A secondary volatilization zone set at a location 5 to 30 cm away from the primary volatilization zone, maintaining a temperature 1 to 20°C higher than the boiling point of the volatile solvent. Conductive fiber manufacturing device through dry spinning.
In Article 7, The above thermoplastic polymer resin is 3 to 30 volume% of the total 100 volume% of the mixture, and The conductive filler is 13 to 45 volume% of the total 100 volume% of the mixture, and The above volatile solvent is characterized as being 50 to 70 volume% of the total 100 volume% of the mixture. Conductive fiber manufacturing device through dry spinning.

Description

Method and Apparatus for Producing Conductive Fibers through Dry Spinning The present invention relates to a method and apparatus for manufacturing conductive fibers through dry spinning. Conductive fibers are used in various applications requiring electrical conductivity, and various methods for manufacturing them have been studied. While wet spinning has been primarily used as a conventional method for manufacturing conductive fibers, this method has disadvantages such as a complex process and difficulty in maintaining uniform conductivity. In particular, wet spinning presents the challenge of requiring complex adjustments to the composite composition and spinning process to enhance fiber conductivity. Accordingly, there is a need to develop technology capable of manufacturing highly conductive fibers through a simple and efficient process. The dry spinning process is attracting attention as a solution to meet these demands; through dry spinning, it is possible to efficiently produce conductive fibers by optimizing the composition of composite materials and improving the equipment structure. Against this backdrop, it is necessary to optimize the dry spinning process and equipment for conductive fibers based on conductive fillers and thermoplastic polymers; in particular, technology is required that enables the filler to be uniformly distributed during the spinning process and maintains the filler content within an appropriate range. FIG. 1 is a flowchart of a method for manufacturing conductive fibers through dry spinning according to one embodiment of the present invention. FIG. 2 is a drawing of a conductive fiber manufacturing apparatus through dry spinning according to one embodiment of the present invention. FIG. 3 is a scanning electron microscope (SEM) image of a conductive fiber manufactured according to one embodiment of the present invention. Figure 4 is an energy dispersive X-ray spectroscopy (EDS) image of a conductive fiber manufactured according to one embodiment of the present invention. A method and apparatus for manufacturing conductive fibers by dry spinning according to embodiments of the present invention will be described in detail with reference to the attached drawings. Since the present invention is capable of various modifications and may take various forms, specific embodiments are illustrated in the drawings and described in detail in the text. However, this is not intended to limit the present invention to specific disclosed forms, and it should be understood that it includes all modifications, equivalents, and substitutions that fall within the spirit and scope of the present invention. Additionally, terms such as "first," "second," etc., may be used to describe various components, but said components should not be limited by said terms. These terms are used solely for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, the first component may be named the second component, and similarly, the second component may be named the first component. Meanwhile, unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as generally understood by those skilled in the art to which the present invention pertains. Terms such as those defined in commonly used dictionaries should be interpreted as having a meaning consistent with their meaning in the context of the relevant technology, and should not be interpreted in an ideal or overly formal sense unless explicitly defined in this application. Embodiments of the present invention will be described in detail below with reference to the attached drawings. The present invention relates to a method and apparatus for manufacturing conductive fibers through dry spinning. Conventional wet spinning methods for manufacturing conductive fibers have limitations, such as complex processes and difficulty in maintaining uniform conductivity, thus requiring a simpler and more efficient manufacturing method. To solve these problems, the present invention provides a method and apparatus for manufacturing conductive fibers with high conductivity by introducing a dry spinning process and optimizing the composite composition and apparatus structure. A method for manufacturing a conductive fiber by dry spinning according to one embodiment of the present invention may include: (a) preparing a mixture comprising a thermoplastic polymer resin, a conductive filler, and a volatile solvent soluble in the thermoplastic polymer resin; (b) spinning the mixture through a nozzle; and (c) forming a conductive fiber by passing the mixture through a dual volatile zone in which the volatile solvent evaporates while being spun. The present invention relates to a method for manufacturing conductive fibers through dry spinning, wherein a thermoplastic polymer resin is responsible for maintaining the shape of the fiber and serves to uniformly fix th