KR20180045746A

KR20180045746A - A method for manufacturing high heat-radiating filament for three dimensional printing

Info

Publication number: KR20180045746A
Application number: KR1020160140461A
Authority: KR
Inventors: 김영혁; 강금식; 김영수; 김성진
Original assignee: (주)비앤케이
Priority date: 2016-10-26
Filing date: 2016-10-26
Publication date: 2018-05-04

Abstract

One aspect of the present invention relates to a method for producing a catalyst, comprising the steps of: (a) dispersing one heat dissipation material and a monomer selected from the group consisting of graphene, graphene oxide, carbon fiber, nano graphite flake, metal powder, In-situ polymerization of the monomer in the presence of a solvent to prepare a master batch; And (b) mixing the master batch and the thermoplastic resin at a weight ratio of 30 to 90: 10 to 70, respectively, followed by extruding.
According to another aspect of the present invention, there is provided a method of manufacturing a semiconductor device, comprising the steps of: (a) using a ball mill to heat a thermally conductive material and a thermosetting material selected from graphene, graphene oxide, carbon fiber, nano graphite flake, metal powder, Mixing and extruding the mixture to produce pellets; (b) mixing the pellet and the thermoplastic resin at a weight ratio of 30 to 90: 10 to 70, respectively, followed by extrusion.

Description

TECHNICAL FIELD [0001] The present invention relates to a method for producing a high heat-dissipating filament for a 3D printer,

The present invention relates to a highly heat-radiating filament composition excellent in heat dissipation property and a method of manufacturing the same.

Due to recent environmental problems, environmental regulations are being tightened across all industries. In particular, the automobile sector has been designated as a major industry for generating greenhouse effect by emitting carbon dioxide, and the emission standards for carbon dioxide have been set worldwide. In order to solve the above problems, development of environmentally friendly materials capable of improving fuel economy while reducing carbon dioxide emissions has been actively pursued in the development direction of automobiles.

As a result, electric vehicles, hybrid vehicles, and plug-in hybrid vehicles were launched. With the development of the smart automobile, the proportion of electric and electronic parts used in automobiles is increasing, and the importance of heat dissipation materials is increasing as a smart automobile requires a high performance high output function.

Copper, aluminum, and stainless steel, which are conventional heat dissipation materials, have a high metal content, which deteriorates the formability and deteriorates design diversity. Therefore, research is underway to replace the polymeric substrate with a composite material in which a material having excellent thermal conductivity, such as metal or ceramic, is added as a filler.

On the other hand, in order to realize a high-performance smart car, not only the performance of the component material itself but also the weight, thinness, miniaturization and versatility of parts are required. As these electronic components become more highly integrated, more heat is generated. This heat not only deteriorates the functions of components but also causes malfunction of peripheral parts and substrate deterioration. Therefore, At the same time, moldability and design optimization must be accompanied. On the other hand, a method of producing parts by applying 3D printer technology has been proposed.

3D printer is a device that manufactures products by processing and laminating materials such as liquid and powder type resin, metal powder, and solid based on design data. 3D printer technology is based on FDM (Fused Deposition Modeling), SLS Selective Laser Sintering, and SLA (Stereo Lithography Apparatus).

In the FDM method, a filament-type thermoplastic material is melted in a nozzle to output in the form of a thin film. In the SLS method, a product is output by selectively irradiating a laser with a laser or an adhesive. In the SLA method, And the product is outputted by scanning. Among these, the 3D printers are becoming more popular because of the lower production cost and easier application of the miniaturization than the other methods.

Accordingly, there is a demand for development of a highly heat-radiating filament composition capable of improving moldability and design optimization by applying 3D printing technology.

Disclosure of Invention Technical Problem [8] Accordingly, the present invention has been made keeping in mind the above problems occurring in the prior art, and an object of the present invention is to provide a method for manufacturing a high heat dissipation filament which includes a heat dissipation material and has excellent heat dissipation properties and improved moldability.

One aspect of the present invention relates to a method for producing a catalyst, comprising the steps of: (a) dispersing one heat dissipation material and a monomer selected from the group consisting of graphene, graphene oxide, carbon fiber, nano graphite flake, metal powder, In-situ polymerization of the monomer in the presence of a solvent to prepare a master batch; And (b) mixing the thermoplastic resin and the master batch in a weight ratio of 30 to 90: 10 to 70, respectively, followed by extrusion.

In one embodiment, the thermoplastic resin may be selected from the group consisting of acrylonitrile-butadiene-styrene, polyethylene, polypropylene, polyvinyl chloride, polyurethane, and mixtures of two or more thereof.

In one embodiment, the thermoplastic resin is selected from the group consisting of polycarbonate, polybutylene terephthalate, polyoxymethylene, polyamide, polyimide, polyether ketone, polyetheretherketone, polyether sulfone, polyphenylene sulfide, polysulfone, Liquid crystal polymers, and mixtures of two or more thereof.

In one embodiment, the monomer is caprolactam, and the thermoplastic resin may be a polyamide.

In one embodiment, the catalyst may be acid.

In one embodiment, the catalyst may be aminocaproic acid.

In one embodiment, the monomer and the heat dissipation material may be used in a weight ratio of 30 to 90: 10 to 70, respectively, in the step (a).

According to another aspect of the present invention, there is provided a method of manufacturing a semiconductor device, comprising the steps of: (a) using a ball mill to heat a thermally conductive material and a thermosetting material selected from graphene, graphene oxide, carbon fiber, nano graphite flake, metal powder, Mixing and extruding the mixture to produce pellets; (b) mixing the thermoplastic resin and the pellets in a weight ratio of 30 to 90: 10 to 70, respectively, followed by extruding the mixture.

The method of manufacturing a high heat dissipation filament for a 3D printer according to an embodiment of the present invention can maintain a substantial moldability and mechanical properties of a thermoplastic resin while maximizing heat dissipation by introducing a high heat dissipation material into the thermoplastic resin.

Further, since the filament can be applied to 3D printing or a 3D printer, it is possible to reduce the cost and time required for the production of the product, and to greatly improve the formability and convenience of the product design.

It should be understood that the effects of the present invention are not limited to the effects described above, but include all effects that can be deduced from the description of the invention or the composition of the invention set forth in the claims.

1 is a schematic view illustrating a method of manufacturing a highly heat-radiating filament for a 3D printer according to an embodiment of the present invention.
FIG. 2 illustrates a method of manufacturing a highly heat-radiating filament for a 3D printer according to another embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described with reference to the accompanying drawings. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. In order to clearly illustrate the present invention, parts not related to the description are omitted, and similar parts are denoted by like reference characters throughout the specification.

Throughout the specification, when a part is referred to as being "connected" to another part, it includes not only "directly connected" but also "indirectly connected" . Also, when an element is referred to as "comprising ", it means that it can include other elements, not excluding other elements unless specifically stated otherwise.

1 is a schematic view illustrating a method of manufacturing a highly heat-radiating filament for a 3D printer according to an embodiment of the present invention.

Referring to FIG. 1, a method of manufacturing a high heat dissipating filament for a 3D printer according to an aspect of the present invention includes the steps of: (a) preparing a mixture of graphene, Dispersing one heat dissipation material and a monomer selected from the group consisting of a monomer and a monomer in a solvent and then in-situ polymerizing the monomer in the presence of a catalyst to prepare a master batch; And (b) mixing the thermoplastic resin and the master batch at a weight ratio of 30 to 90: 10 to 70, respectively, followed by extruding.

First, in the step (a), a heat dissipation material and a monomer selected from the group consisting of graphene, oxide graphene, carbon fiber, nano graphite flake, metal powder and a mixture of two or more thereof are dispersed in a solvent, The masterbatch can be prepared by in-situ polymerization of the monomers.

By in-situ polymerization of the monomer, the master batch may include the heat-dissipating material and the thermoplastic resin obtained by polymerizing the monomer and the heat-dissipating material. At this time, the thermoplastic resin and the heat dissipation material in which the monomer is polymerized may be contained in the master batch in a weight ratio of 30 to 90: 10 to 70, respectively.

Generally, when a powdery functional material for imparting a specific function to a resin is directly mixed, accurate mixing may be difficult, and physical properties may be deteriorated due to kneading property and dispersion failure. Therefore, when the master batch or a pellet to be described later is used, the blending ratio can be accurately controlled, the dispersibility can be improved, and scattering of the powder material during the operation can be prevented, and workability can be improved.

Further, since the thermoplastic resin and the heat dissipation material are low in compatibility and compatibility, when an excessive heat dissipation material is used, the essential molding property and mechanical properties of the thermoplastic resin may be deteriorated. That is, it is difficult to balance both the moldability, the mechanical properties, and the heat radiation properties of the composition including the thermoplastic resin and the heat dissipation material.

On the other hand, in the method for producing a high heat-radiating filament for a 3D printer, a method of firstly blending a thermoplastic resin and a heat-radiating material and then further blending a thermoplastic resin is used. Particularly, in the first blending, A method of in-situ polymerization of monomers and a heat dissipation material dispersed in a solvent as described above is used to significantly increase the amount of heat dissipation material in the master batch up to 70 wt% By introducing it into a filament for a 3D printer, it is possible to improve the heat radiation property of the filament and maintain the moldability and mechanical properties of the thermoplastic resin.

The heat dissipation material may be added to the thermoplastic resin to impart heat radiation properties to the filament composition. Specifically, thermal conduction is to move from a high temperature to a low temperature in the material. Generally, there are two thermal conduction mechanisms in solid materials, which can be divided into phonon conduction and electron conduction.

The phonon conduction is conducted through lattice vibration by phonons, and the electron conduction conducts heat through free electrons. As used herein, the term "Phonon " refers to a sound wave having particulate nature, which is also referred to as an acoustic quantum or a phoneme. The thermal conduction method differs depending on the kind of the material. Generally, the metal is thermally conductive by free electrons having a high speed. Since the ceramic is an electrical insulator, the free electrons are insufficient.

Therefore, the parts made of the high heat dissipation filament composition including the heat dissipation material are applied to the field of application of electronic parts requiring high heat dissipation characteristics, for example, in automobiles, so that the performance such as efficiency, high output, have.

The type of the heat dissipation material may be one selected from the group consisting of graphene, oxide graphene, carbon fiber, carbon nanotube, nano graphite flake, metal powder, and a mixture of two or more thereof.

The graphene is a carbon isotope having a structure in which carbon atoms are connected in a hexagonal shape, and has an atomic level thickness and a large surface area in a two-dimensional plate-like structure, and has excellent mechanical properties, electrical conductivity, and thermal conductivity. In particular, single layer graphene exhibits low thermal conductivities, good charge mobility, current density, chemical resistance, flexibility, stretchability, and excellent thermal conductivity of about 5,000 W / mK.

On the other hand, graphene oxide is an oxide of graphene and can be applied to various fields. The graphene can be obtained by peeling off each graphene layer of graphite. Due to the Van der Waals force between the graphene layers, not only the peeling itself is not easy but also thermodynamically unstable, easy to do. Accordingly, when the graphene is provided in the form of an oxide, the yield of graphene increases, mass production is possible, and the process cost can be reduced.

The carbon fiber may be of rayon type, pitch type or polyacrylonitrile type.

The carbon fibers may be classified into rayon, pitch, and polyacrylonitrile based on precursor materials.

The precursor material may be a material that determines the shape of the carbon fiber, that is, a starting material, and may be pyrolyzed in an inert atmosphere to produce carbon fibers. It is important to increase the carbonization yield among the properties of the carbon fiber. For this purpose, it is necessary to manufacture a polymer precursor fiber having a controlled internal structure and high purity, a stabilized pretreatment process, and a carbonization process.

Among them, a high modulus carbon fiber produced from a pitch system and a high strength carbon fiber produced from a polyacrylonitrile system are widely used. In the present invention, rayon based, pitch based, and polyacrylonitrile based carbon fibers are selectively used, Mixtures of two or more of them may also be used.

The rayon-based carbon fiber can be produced using a special grade viscous rayon having few defects. The carbonization yield is 2 to 20%, and the carbon fibers produced may have a tensile strength of 345 to 690 MPa, a tensile elastic modulus of 20 to 55 GPa, and a density of 1.0 to 1.43 g / cm < ³ >. Such physical properties can be enhanced by drawing graphitization at 2800 to 3000 ° C.

The pitch-based carbon fibers may be manufactured from petroleum pitch and coal pitch depending on the raw material of pitch. The pitch is present in a complex mixture of many heterogeneous organic compounds in which the condensed benzene ring has an alkyl chain or is separated by an alkyl chain. In particular, the precursor fibers produced by liquid crystal spinning of the mesophase pitch melt can maintain or enhance the axial orientation during the carbonization and graphitization processes, and can have a tensile modulus of elasticity of about 830 Gpa without stretching.

The polyacrylonitrile-based carbon fibers can be produced by preparing polyacrylonitrile precursor fibers and stabilizing, carbonizing, and graphitizing the precursor fibers. Specifically, when a linear polymer, polyacrylonitrile, is used as a starting material and subjected to stabilization at 200 to 300 ° C for 1 to 2 hours in the air, the precursor material is subjected to carbonization by chain cutting, crosslinking, dehydrogenation and cyclization. A thermally stable ladder structure can be formed.

In order to maintain and improve the orientation of the molecules in the stabilization step, the shrinkage can be applied within 15% by applying stretching. Further, in the stabilization step, a complicated multi-step chemical reaction occurs and water, carbon dioxide, hydrogen cyanide and the like are released to cause a weight loss of 5 to 8%. The carbon content in the precursor fiber is 68 to 62% Lt; / RTI > Subsequently, when the precursor fibers are carbonized at 1,200 to 2,500 DEG C under an inert gas atmosphere, carbon fibers of 45 to 55 wt% based on the total weight of the precursor fibers can be obtained.

Since the polyacrylonitrile-based carbon fiber is substantially composed only of carbon, weight reduction can be minimized even in a graphitization process at 2,500 ° C or higher, and a structural change in the axial direction of the carbon fiber can be increased, Can be improved.

The tensile elastic modulus of the polyacrylonitrile-based carbon fiber may be 517 GPa or more when heat-treated at 3,000 DEG C or more, depending on the heat treatment temperature between graphitization processes. The boron compound may be used as a catalyst in order to lower the process temperature and shorten the process time in the graphitization process.

The carbon nanotube is a substance in which carbon atoms are one-dimensionally dried so that one carbon is bonded to another carbon atom in a hexagonal honeycomb pattern to form a tube, and the diameter of the tube is extremely small in the nanometer level. The carbon nanotube has excellent mechanical properties, electrical selectivity, high efficiency hydrogen storage, etc. However, the dispersibility of the carbon nanotube to the polymer resin is low, and the kneading property with the epoxy resin and other components may be deteriorated.

The nano graphite flake has a structure in which a plurality of graphene flakes are stacked and a graphene flake having a stacked structure of graphene flakes having a graphene flake having 1 to 50 layers of graphene flakes The branch is a plate-like structure.

The metal powder may be one selected from the group consisting of aluminum (Al), copper, silver, nickel, iron, and mixtures of two or more thereof. The metal powder has a high thermal conductivity due to abundance of free electrons, but has a problem of miniaturization of components and a variety of designs because of low moldability. Therefore, it is preferable to add them in combination with a base metal such as ceramics which is more formable than the above-mentioned metal powder.

The thermoplastic resin may be one general plastic selected from the group consisting of acrylonitrile-butadiene-styrene, polyethylene, polypropylene, polyvinyl chloride, polyurethane, and a mixture of two or more thereof, but is not limited thereto. As used herein, the term "Commodity plastics" refers to plastics having general plastic properties.

The thermoplastic resin may be at least one selected from the group consisting of polycarbonate, polybutylene terephthalate, polyoxymethylene, polyamide, polyimide, polyether ketone, polyetheretherketone, polyether sulfone, polyphenylene sulfide, polysulfone, A mixture of two or more of the above, and preferably, it may be polyamide. However, the present invention is not limited thereto. As used herein, the term "engineering plastics" refers to plastics having physical properties that can be applied to engineering materials by complementing thermal and mechanical strength, which are the greatest disadvantages of general-purpose plastics. Super engineering plastics "refers to high-performance plastics with improved thermal and mechanical properties over engineering plastics.

The general-purpose plastic and the engineering or super engineering plastic may be used independently of each other on the base material of the filament, and may be mixed and used as necessary in consideration of the use, physical properties, manufacturing cost, and the like of the final product. For example, it is desirable to realize the inherent physical properties of engineering or super engineering plastics, but in this case, it is possible to mix commercial plastics in a certain ratio since commercial possibilities are low and manufacturing costs may increase.

For example, in the step (a), the monomer is caprolactam, the heat dissipation material is graphene oxide, and the catalyst is aminocaproic acid. Specifically, caprolactam, which is a monomer of polyamide (nylon), and graphene oxide are dispersed in an organic solvent, aminocaproic acid is added, and the mixture is heated to 200 ° C or higher to form a reducing atmosphere of oxidized graphene It is possible to induce ring-opening polymerization of caprolactam and consequently polyamide synthesis.

In step (b), the master batch and the thermoplastic resin produced in situ in step (a) are mixed at a weight ratio of 10 to 70: 30 to 90, respectively, A filament can be produced.

On the other hand, the extrusion can be performed by a single screw extruder or a twin screw extruder. As used herein, the terms "single-screw extruder" and "twin-screw extruder" refer to a screw extruder having one and two screws, respectively.

The uniaxial extruder is suitable for extrusion molding of most thermoplastic resins, and the biaxial extruder is mainly used for manufacturing a large diameter pipe, for example, a polyvinyl chloride (PVC) pipe. The biaxial extruder is more widely used than a single-screw extruder due to its complicated structure, but is extensively used even at a slow screw driving speed,

When the extruder performs the extrusion spinning in the steps (a) and (b), the extrusion temperature of the extruder may be 200 to 300 ° C. The extrusion temperature of the extruder can be controlled differently depending on the type of the thermoplastic resin in consideration of the possibility of the mixture being broken due to the pressure and temperature applied to the mixture in the extrusion process.

Meanwhile, the extruder may have a length to diameter ratio of 25 to 50: 1. The "length: diameter ratio" of the extruder means a ratio of the length (length, L) and the diameter (diameter, D) of the screw, and this is one of the factors determining the extrusion performance of the extruder. Generally, the larger the "length: diameter ratio" value of the screw, the better the kneading effect and the quality of the product and the less the deviation of the extrusion amount. However, the ratio of the length to the diameter depends on the kind and nature of the material to be fed into the extruder Can be adjusted differently.

If the ratio of the length to the diameter of the extruder is less than 25: 1, a required level of kneading effect can not be realized. If the ratio is more than 50: 1, the size of the extruder and the capacity of the driving motor may be influenced.

The driving speed of the extruder may be 50 to 500 rpm. If the driving speed of the extruder is less than 50 rpm, a necessary level of kneading effect can not be realized. If the driving speed of the extruder is more than 500 rpm, the rotation speed of the motor Due to the large number, the motor and the decelerating device may be subjected to excessive load and be damaged.

FIG. 2 illustrates a method of manufacturing a highly heat-radiating filament for a 3D printer according to another embodiment of the present invention.

Referring to FIG. 2, a method of manufacturing a high heat dissipation filament for a 3D printer according to another aspect of the present invention includes the steps of (a) preparing a mixture of graphene, graphene oxide, carbon fiber, nano graphite flake, Mixing a thermally dissolvable material and a thermoplastic resin selected from the group consisting of a thermoplastic resin and a thermoplastic resin by using a ball mill and extruding the mixture to produce a pellet; (b) mixing the thermoplastic resin and the pellets in a weight ratio of 30 to 90: 10 to 70, respectively, and extruding the mixture.

The types of the heat dissipation material and thermoplastic resin that can be used are as described above.

The method for manufacturing a high heat-radiating filament for a 3D printer is a method in which a thermoplastic resin and a heat-radiating material are firstly blended into a pellet, and then a thermoplastic resin is further blended. Particularly, in the first blending, A thermally conductive material and a heat dissipation material are mixed by using a ball mill, thereby significantly increasing the amount of heat dissipation material in the pellet, more specifically, 50% by weight of the heat dissipation material in the pellet is introduced into the filament for 3D printer, The moldability and mechanical properties of the thermoplastic resin can be maintained.

The pellet is produced by mixing, extruding and cutting a substance to be imparted with a special function based on a thermoplastic resin to form a pellet. The pellet has essentially the same action and effect as the master batch, The master batch has a difference in that a high concentration of the functional material is introduced into the resin.

In the above steps (a) and (b), the extrusion may be performed at 200 to 300 ° C, and the usable device and extrusion conditions are as described above.

Hereinafter, embodiments of the present invention will be described in detail.

Example One

70 parts by weight of caprolactam and 30 parts by weight of graphene oxide were added to benzene and stirred at 80 DEG C to disperse uniformly. Aminocaproic acid was added and the polyamide-oxidized graphene master batch was prepared by ring-opening polymerization of caprolactam by heating at 200 ° C or higher to form a reducing atmosphere of the oxidized graphene.

50 parts by weight of the masterbatch was added to 100 parts by weight of polyamide, melted and kneaded, extruded at 250 DEG C and 300 rpm using a twin-screw extruder, and cut to prepare filament specimens.

Example 2

30 parts by weight of graphene was added to 100 parts by weight of polyamide, melt-kneaded, extruded at 250 DEG C and 300 rpm using a twin-screw extruder, and cut to produce pellets.

50 parts by weight of the pellets were added to 100 parts by weight of the polyamide, melt kneaded, extruded at 250 DEG C and 300 rpm using a twin-screw extruder, and cut to produce filament specimens.

Comparative Example One

A filament composition was prepared in the same manner as in Example 1 except that no heat radiation material was added.

Comparative Example 2

A filament composition was prepared in the same manner as in Example 1 except that the amount of the master batch was adjusted to 80 parts by weight

Comparative Example 3

A filament composition was prepared in the same manner as in Example 2, except that the amount of pellets added was adjusted to 80 parts by weight

Experimental Example : Of the filament composition Heat dissipation evaluation

In order to evaluate the heat dissipation properties of the filament compositions prepared according to Examples 1 to 2 and Comparative Examples 1 to 3, the filament composition was molded into a 10 * 10 mm sized molded body specimen using a Moment 3D printer. The thermal conductivity was measured using Netzsch LFA 457, and the results are shown in Table 1 below.

division Thermal conductivity (W / m · k) Formability Example 1 2.8 Great Example 2 2.7 Great Comparative Example 1 0.2 Great Comparative Example 2 3.5 Bad Comparative Example 3 3.3 Bad

Referring to Table 1, the specimens made of the filament compositions (Examples 1 and 2) containing the graphene or the oxide graphene as the heat-radiating material had thermal conductivity of 2.8 W / m · k and 2.7 W / m · k And it is expected that the filament composition will exhibit excellent performance and effects when applied to electronic parts, in particular, smart automobile parts. In addition, the filaments of Examples 1 and 2 were continuously formed without interruption of feeding and discharging of filaments during 3D printing, and thus, they were excellent in moldability and workability.

On the other hand, in the case where the heat-radiating material was not added (Comparative Example 1), the heat-radiating material was excellent in moldability, but no heat-releasing property could be realized.

On the other hand, when the addition amount of the master batch or the pellet was excessively large (Comparative Examples 2 and 3), the thermal conductivity was higher than that of Examples, but the pellets were interrupted randomly in the product molding, And thus caused unnecessary defects in the product.

It will be understood by those skilled in the art that the foregoing description of the present invention is for illustrative purposes only and that those of ordinary skill in the art can readily understand that various changes and modifications may be made without departing from the spirit or essential characteristics of the present invention. will be. It is therefore to be understood that the above-described embodiments are illustrative in all aspects and not restrictive. For example, each component described as a single entity may be distributed and implemented, and components described as being distributed may also be implemented in a combined form.

The scope of the present invention is defined by the appended claims, and all changes or modifications derived from the meaning and scope of the claims and their equivalents should be construed as being included within the scope of the present invention.

Claims

(a) dispersing one heat dissipation material and a monomer selected from the group consisting of graphene, graphene oxide, carbon fiber, nano graphite flake, metal powder, and a mixture of two or more thereof in a solvent in the presence of a catalyst, In-situ polymerization to prepare a master batch; And
(b) mixing the thermoplastic resin and the master batch in a weight ratio of 30 to 90: 10 to 70, respectively, and extruding the mixture.

The method according to claim 1,
Wherein the thermoplastic resin is one selected from the group consisting of acrylonitrile-butadiene-styrene, polyethylene, polypropylene, polyvinyl chloride, polyurethane and mixtures of two or more thereof.

The method according to claim 1,
Wherein the thermoplastic resin is selected from the group consisting of polycarbonate, polybutylene terephthalate, polyoxymethylene, polyamide, polyimide, polyether ketone, polyether ether ketone, polyether sulfone, polyphenylene sulfide, polysulfone, Wherein the mixture is one selected from the group consisting of the above-mentioned mixtures.

The method according to claim 1,
Wherein the monomer is caprolactam, and the thermoplastic resin is a polyamide.

The method according to claim 1,
Wherein the catalyst is an acid.

6. The method of claim 5,
Wherein the catalyst is aminocaproic acid.

The method according to claim 1,
Wherein the monomer and the heat radiation material are used in a weight ratio of 30 to 90: 10 to 70, respectively, in the step (a).

(a) mixing a thermally dissolvable material and a thermoplastic resin selected from the group consisting of graphene, graphene oxide, carbon fiber, nano graphite flake, metal powder and a mixture of two or more thereof and a thermoplastic resin using a ball mill, Producing;
(b) mixing the thermoplastic resin and the pellets in a weight ratio of 30 to 90: 10 to 70, respectively, followed by extruding.