KR102159078B1 - Method for Manufacturing of Heat-radiating Structure - Google Patents

Abstract

The present invention is to improve the heat dissipation performance of the heat dissipation structure by using a carbon-based material in which resin is added to a carbon mixture of graphite material and carbon nanotubes as a material for forming a heat dissipation structure, and a heat dissipation structure is applied with a low weight. It relates to a method of manufacturing a heat dissipating structure that allows the weight of the product to be reduced
Crushing and homogenizing at least one graphite material selected from the group consisting of impression graphite, artificial graphite, earth graphite and expanded graphite, plate graphite, and spheroidal graphite to a size of 1 to 50 μm; Crushing and homogenizing at least one carbon material selected from the group consisting of carbon nanotubes, graphene, and carbon black to a size of 20 to 500 nm; Dispersing the crushed carbon material to a content of 2 to 20% by weight based on the total weight of the dispersion in a solvent to form a carbon material dispersion; After mixing 80 to 98% by weight of the crushed and homogenized graphite material and 2 to 20% by weight of the carbon material dispersion, putting it into a vacuum stirrer and stirring, then lowering the internal temperature of the vacuum stirrer to 30 to 50°C to stabilize Step and; Mixing the agitated graphite material and 20 to 60% by weight of a carbon material dispersion and 40 to 80% by weight of a binder composed of polyamide resin or polyphenylene sulfide, followed by drying and stirring to form a carbon-based material; Pelletizing after further including 1 to 5% by weight of each of a decomposition inhibitor and an antioxidant for preventing decomposition of the polymer contained in the carbon-based material by ultraviolet rays; And inserting the pelletized carbon-based material into a block mold by a certain weight unit, and injection molding for 30 to 90 seconds at a temperature condition of 200 to 350°C and a pressure of 80 to 160 kgf/cm 2 to form a heat dissipating structure. It characterized in that it includes;

Description

Method for Manufacturing of Heat-radiating Structure}

The present invention relates to a method of manufacturing a heat dissipation structure, and more particularly, as a material for forming a heat dissipation structure, heat dissipation of a heat dissipation structure by using a carbon-based material in which resin is added to a carbon mixture of graphite material and carbon nanotubes. The present invention relates to a method of manufacturing a heat dissipation structure, which improves performance and reduces the weight of a product to which the heat dissipation structure is applied at low weight.

In general, various types of heat sinks are used in home or industrial electronic devices. In the case of computers, since high heat is generated during high-speed calculations in the CPU (Central Processing Unit), a heat dissipation structure such as a cooling plate or heat sink to cool it is always installed, and LED (Light Emitting Diode), which is widely used for lighting recently. ) Even in the case of lighting devices, heat is generated according to the operation of the lighting circuit, so a heat dissipation structure is mounted on the Printed Circuit Board.

Various electronic components are mounted on the above-described printed circuit board to constitute a circuit, and with the recent development of the electronic industry, high-speed and high-density of circuits provided on the printed circuit board are required, and for this reason, the printed circuit board becomes a microcircuit. It is necessary to solve problems such as high functionality, high reliability, and excellent electrical characteristics.

A semiconductor device such as an IC (integrated circuit) or a TR (transistor) and a heating device such as a light emitting diode are mounted on the printed circuit board, and a lot of heat is generated during their operation. In particular, in the case of an optical device such as a light emitting diode, a very large amount of heat is generated. Therefore, if smooth heat dissipation is not performed on the circuit board on which the heating element is mounted, the temperature of the printed circuit board itself rises, resulting in malfunction and inoperability of the heating element, and acts as a factor deteriorating the reliability of the product. Therefore, the heat dissipation problem is solved by attaching a separate heat dissipation structure to a printed circuit board made of metal such as aluminum, and in some cases, a heat dissipation functional paint on the aluminum plate or engineering plastic constituting the printed circuit board. When forming a substrate by direct coating or extrusion method, heat radiation is achieved by coating a heat radiation functional paint on an aluminum plate or an extruding agent.

A typical heat dissipation structure is made of a metal material such as copper or aluminum as a raw material, and is processed by cutting, die casting, or hot extrusion. It is manufactured, and in some cases, a metal heat pipe is installed to increase heat dissipation.

However, since such a metal heat dissipation structure is heavy, it is hindering the weight reduction of electronic equipment. In addition, since the metal heat pipe is not only heavy in weight, but also has a complex structure in order to generate a capillary phenomenon, it is difficult to reduce the thickness and cost is high.

Meanwhile, as a result of researching the prior art related to the present invention, a number of patent documents have been searched, and some of them are as follows.

Patent Document 1 is a method of covalently bonding carbon nanotubes and metal-based elements through a pretreatment process of carbon nanotubes and metal-based elements, and further dissolving them in the corresponding metal by using them as a master alloy. By configuring the sink, it is disclosed a heat sink composed of a composite material having covalently bonded carbon nanotubes that can reduce the weight of the mounted product by having a large mechanical strength like steel and reducing the weight by 20% or more. .

Patent Document 2 contains a dispersion containing a surface-modified carbon material, a heat-resistant additive, and an emulsion that improves adhesion, and has excellent heat dissipation performance and can be applied to various industrial fields requiring temperature control. A coating composition is disclosed.

Patent Document 3, by forming a structure in which graphene is bonded in a direction orthogonal to the longitudinal direction of carbon nanotubes, carbon which can improve thermal conductivity and electrical conductivity in the length and width directions of the existing longitudinal direction It discloses a heat sink composed of a nano-material-graphene composite material.

Patent Document 4 discloses that the carbon composite material and aluminum powder having high thermal conductivity are crushed and mixed into fine particles through the first ball milling step and the second ball milling step, and at the same time, the dispersibility of the carbon composite material is secured through the dispersion step. Disclosed is a heat dissipation material using a carbon composite material and a method of manufacturing the same, which can induce lighter manufacturing by reducing volume and volume while having excellent thermal conductivity compared to conventional aluminum heat sinks, and reducing production costs.

Patent Document 5, by replacing the material of the heat dissipation body and the heat dissipation assembly with a carbon nanotube heat dissipation material instead of the conventional aluminum, it is possible to significantly increase the thermal conductivity, heat dissipation rate and heat dissipation rate, and the heat dissipation assemblies slide on the outer surface of the radiating body. By being configured to be attached in a manner, equipment inspection and replacement can be made easily, and the heat exchange efficiency is further increased by making the heat exchange more active by forming the support plates of the heat dissipation assembly facing the LED substrate to be spaced apart from each other by the curved part. When manufacturing a carbon nanotube heat dissipation material, the carbon composite material and metal powder with high thermal conductivity are crushed and mixed into fine particles through the first ball milling step and the second ball milling step. By securing dispersibility, it has excellent thermal conductivity compared to conventional aluminum, and at the same time, it is possible to induce lighter manufacturing by reducing volume and volume, and to reduce production cost. Disclosed is a heat radiation frame for a lighting device.

KR 10-2010-0008733 A KR 10-2012-0013914 A KR 10-2017-0000220 A KR 10-2017-0068865 A

The present invention was conceived to solve the problems of the prior art, so that a carbon-based material in which resin is added to a carbon mixture in which a graphite material and carbon nanotubes are mixed instead of a metal can be used as a material for forming a heat dissipating structure. It is an object of the present invention to provide a method for manufacturing a heat dissipation structure, which enables the heat dissipation performance of the heat dissipation structure to be improved and the weight of the product to which the heat dissipation structure is applied.

In addition, the present invention provides a method of manufacturing a heat dissipation structure so that the heat dissipation structure can be easily molded into a heat dissipation structure, and thus productivity is improved, and the produced heat dissipation structure can be laminated in multiple layers, and its surface is not damaged during the lamination process. There is a purpose.

The manufacturing method of the heat dissipating structure of the present invention for achieving the above object is made of crystalline graphite, synthetic graphite, amorphous graphite, and expandable graphite, plate graphite, and nodular graphite. Crushing and homogenizing at least one graphite material selected from the group consisting of 1 to 50 μm in size; Crushing and homogenizing at least one carbon material selected from the group consisting of carbon nanotubes, graphene, and carbon black to a size of 20 to 500 nm; A carbon material crushed to have a content of 2 to 20% by weight based on the total weight of the dispersion is composed of at least one selected from the group consisting of distilled water, alcohol, dimethylformamide (DMF), methyl ethyl ketone (MEK), and polyol. Dispersing in a solvent to form a carbon material dispersion; After mixing 80 to 98% by weight of the crushed and homogenized graphite material and 2 to 20% by weight of the carbon material dispersion, putting it into a vacuum stirrer and stirring to form a carbon mixture, then the temperature inside the chamber of the vacuum stirrer is 30 to 50°C. Stabilizing the carbon mixture by descending to; Mixing 20 to 60% by weight of a carbon mixture and 40 to 80% by weight of a binder made of polyamide resin or polyphenylene sulfide, followed by drying and stirring to form a carbon-based material; Pelletizing after further including 1 to 5% by weight of each of a decomposition inhibitor and an antioxidant for preventing decomposition of the polymer contained in the carbon-based material by ultraviolet rays; And inserting the pelletized carbon-based material into a block mold by a certain weight unit, and injection molding for 30 to 90 seconds at a temperature condition of 200 to 350°C and a pressure of 80 to 160 kgf/cm 2 to form a heat dissipating structure. Including ;,
The decomposition inhibitor is from the group consisting of hydroxybenzophenone, hydroxyphenyl benzotriazole, arylester, oxanilides, and formamidine. It consists of at least one selected,
The antioxidant is characterized in that it consists of one or more selected from the group consisting of phenolic antioxidants, phosphorus antioxidants, sulfur antioxidants, and amine antioxidants.

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In the method of manufacturing a heat dissipating structure of the present invention, a heat dissipating structure is formed from a carbon-based material formed by crushing and homogenizing a graphite material and a carbon material to have a homogeneous particle size distribution, and then impregnating a binder such as a polyamide resin. As the material maintains a covalent bond between graphite materials, it exhibits excellent heat dissipation performance and improves formability.

In addition, according to the manufacturing method of the heat dissipation structure of the present invention, the heat dissipation structure is formed by using a carbon-based material composed of a carbon material and a binder such as polyamide resin, so that it has a significantly lighter weight than the heat dissipation structure formed of metal. And, by using excellent formability, slimming and lightening are possible, and thermal conductivity and heat dissipation performance are significantly improved.

1 is a flow chart showing a method of manufacturing a carbon-based material used in the method of manufacturing a heat dissipating structure according to the present invention.
2 is a perspective view showing a heat dissipation structure manufactured according to the present invention.
3 is a reference diagram showing a state in which the heat dissipation structure manufactured according to the present invention is stacked in multiple layers.

Hereinafter, a method of manufacturing the heat dissipating structure of the present invention will be described with reference to the accompanying drawings.

1 is a flow chart showing a method of manufacturing a carbon-based material used in the method of manufacturing a heat dissipating structure according to the present invention, FIG. 2 is a perspective view showing a heat dissipating structure manufactured according to the present invention, and FIG. 3 is It is a reference diagram showing a state in which the manufactured heat dissipation structure is stacked in multiple layers.

As shown in Fig. 1, a method of manufacturing a carbon-based material used in a method of manufacturing a heat dissipating structure according to the present invention includes the steps of crushing and homogenizing a graphite material; Crushing and homogenizing the carbon material; Dispersing the crushed carbon material in a solvent to form a carbon material dispersion; Stirring the crushed graphite material and the carbon material dispersion to form a carbon mixture in which the graphite material and the carbon material dispersion are mixed; And drying and stirring after mixing the carbon mixture and the binder to form a carbon-based material.

The step of crushing and homogenizing the graphite material is 1 selected from the group consisting of crystalline graphite, synthetic graphite, amorphous graphite, and expandable graphite, plate graphite, and nodular graphite. This is the step of homogenizing by crushing more than a kind of graphite material. This graphite material has high thermal conductivity, excellent mechanical properties and corrosion resistance, and has light properties, so that it can exhibit excellent performance when used as a material for heat dissipation structures and printed circuit boards. And the step of crushing and homogenizing the graphite material (S10) is to make the graphite material in the raw material state having a heterogeneous particle size distribution have a homogeneous particle size distribution. As the particle size distribution of the graphite material is uniformly controlled, the graphite material The heat conduction and heat dissipation performance is greatly improved.

The step of crushing and homogenizing the graphite material may be performed using a conventional physical method, but may also be performed using liquid nitrogen. That is, by pouring liquid nitrogen into a container containing the graphite material and leaving it for about 30 minutes to 2 hours, the graphite material can be crushed and homogenized. This is a result of fine crushing of the graphite material in the process of vaporization after liquid nitrogen permeates the graphite material. In addition, the crushing and homogenizing step of the graphite material is preferably repeated crushing and homogenization steps until a graphite material having a desired particle size and a uniform particle size distribution is obtained, and the crushed and homogenized graphite material is 60 to 80. It is preferable to dry for 12 to 36 hours at a temperature of °C.

At this time, the particle size of the graphite material is appropriately selected in consideration of the specific characteristics of the heat dissipation structure, the final product, the process conditions, and the working environment, and it is preferable to repeat the process until the particle size of the graphite material becomes 1-50㎛. . If the particle size of the graphite material is less than 1㎛, it is difficult to crush, and the change in the square performance according to the size decrease is insignificant. It is not appropriate because it acts as a deteriorating factor.

The step of crushing and homogenizing the carbon material (S20) is to crush and homogenize a carbon material consisting of at least one selected from the group consisting of carbon nanotubes, graphene, and carbon black, having a heterogeneous particle size distribution. The carbon material in the raw material state is crushed to have a homogeneous particle size distribution. In this case, in the crushing and homogenizing step of the carbon material, liquid nitrogen may be used as in the crushing and homogenizing step of the graphite material. In addition, the step of crushing and homogenizing the carbon material is also preferably repeated until a carbon material having a desired particle size and a uniform particle size distribution can be obtained.

At this time, the particle size of the carbon material is appropriately selected in consideration of the specific characteristics of the heat dissipation structure, the final product, the process conditions, and the working environment, and the crushing and homogenization steps are repeated until the particle size of the carbon material becomes 20 to 500 nm. It is desirable to carry out. When the particle size of the carbon material is less than 20 nm, aggregation is difficult to occur, and when the particle size of the carbon material exceeds 500 nm, aggregation has already occurred, and it is difficult to uniformly disperse the carbon material in a subsequent process, which is not appropriate.

Among the above-described carbon materials, carbon nanotubes are helical materials of a network structure in which six carbon atoms form a hexagonal shape and are connected in a tube shape, and have a three-dimensional structure. These carbon nanotubes are graphite-modified, single-walled carbon nanotubes in which one layer of graphite is pushed into a tube, and multi-walled carbon nanotubes composed of several layers. wall Carbon Nanotube). These carbon nanotubes have excellent mechanical properties, have a very high aspect ratio (length/diameter), have excellent tensile stress and excellent thermal conductivity, and are therefore applied to a very large range. In addition, it has the properties of a conductor or a semiconductor depending on the shape of the coil, the energy gap varies according to the diameter, and has a three-dimensional structure and a quasi-one-dimensional structure, thus exhibiting a peculiar quantum effect. In addition, the most important thermal property of carbon nanotubes is that the thermal conductivity is very high at 6,600W/mK, and is known to be due to the very large average free path of phonons.

In addition, when a carbon material such as carbon nanotubes is mixed with a graphite material in a subsequent process, the carbon material is connected by covalent bonds between the graphite materials, thereby improving thermal conductivity and exhibiting excellent heat dissipation performance.

The step of dispersing the crushed carbon material in a solvent to form a carbon material dispersion is a step of dispersing the crushed carbon material in a solvent so that the content is 2 to 20% by weight based on the total weight of the dispersion. At this time, the solvent may be made of at least one selected from the group consisting of distilled water, alcohol, dimethylformamide (DMF), methyl ethyl ketone (MEK), and polyol, and various process conditions such as precipitation and long-term properties, material cost, and manufacturing environment Choose appropriately in consideration.

In forming the carbon material dispersion, the carbon material is contained in an amount of 2 to 20% by weight based on the total weight of the dispersion, which does not cause dispersibility problems when the content of the carbon material is less than 2% by weight, but graphite in the subsequent process. When mixed with a material, the properties of thermal conductivity and heat dissipation cannot be exhibited, and when the content of the carbon material exceeds 20% by weight, there is a concern that a problem of dispersibility may occur, and further effects can be expected to increase according to the content increase. Because there is no.

The production of the carbon material dispersion may use one or more methods selected from the group consisting of ultrasonic, roll milling, ball milling, jet milling, screw mixing, attraction milling, bead milling, basket milling, co-rotation mixing and super milling. That is, in each method used in the production of the carbon material dispersion, specific operating conditions and the like are appropriately selected so that a uniform dispersion can be formed.

In addition, at the time of manufacturing the carbon material dispersion, one or more selected from the group consisting of a dispersant, a neutralizing agent, and an antifoaming agent may be added as necessary to improve the dispersibility of the carbon material and process convenience. In addition, after the carbon material dispersion forming step, the carbon material dispersion may be dried for 12 to 36 hours at a temperature of 50 to 70°C.

In the step of forming a carbon mixture by mixing the crushed and homogenized graphite material and the carbon material dispersion, 80 to 98% by weight of the crushed and homogenized graphite material and 2 to 20% by weight of the carbon material dispersion are mixed to prepare a carbon mixture. As a forming step, it is carried out in a vacuum stirrer. Mixing and stirring of the crushed and silicified graphite material and the carbon nanodispersion is performed in a vacuum stirrer with a vacuum degree of 10 ^-1 Torr, a temperature of 80 to 120°C, and a stirring speed of 100 to 120 rpm, and for 40 to 100 minutes under a nitrogen atmosphere.

In mixing and stirring, 2 to 20% by weight of the carbon material dispersion is added, which means that when the content of the carbon material dispersion is less than 2% by weight, the effect of improving the thermal conductivity of the graphite material is insignificant, and when it exceeds 20% by weight This is because it is uneconomical because it is not possible to expect any more effect of improving thermal conductivity according to the increase in the content of the

After mixing and stirring, the carbon mixture is stabilized by opening the vacuum valve to introduce air and lowering the temperature inside the chamber of the vacuum stirrer to 30 to 50°C. In this way, lowering the internal temperature of the chamber of the vacuum stirrer is that when the internal temperature of the chamber exceeds 50°C, polyamide resin and polyphenylene sulfide, which serve as binders for carbon-based materials for heat dissipation structures introduced in the subsequent process, are heated. This is because hardening and hardening of the particles may occur.

The step of mixing the carbon mixture and the binder, drying and stirring to complete the carbon-based material, is a step of forming a carbon-based material for manufacturing a heat dissipating structure, and 20 to 60% by weight of the carbon mixture and polyamide resin or poly After mixing 40 to 80% by weight of a binder made of phenylene resin, it is dried and stirred. And, when drying and stirring after mixing the carbon mixture and the binder, it is preferable to stir for 60 to 150 minutes at a stirring speed of 100 to 120 rpm.

The polyamide resin or polyphenylene sulfide serves as a binder that connects the carbon mixture in the carbon-based material for a heat radiation structure, and has easy processability and economy for molding into a heat radiation structure, and has excellent thermal conductivity. And a carbon material to form a molded structure having heat dissipation properties.

At this time, when the content of the carbon mixture exceeds 60% by weight, not only may the molding of the heat dissipation structure become difficult, but also the mechanical properties of the formed structure may be deteriorated, and when the content of the carbon mixture is less than 20% by weight, the heat dissipation performance is insignificant, It is not suitable for use as a material for heat dissipation structures.

In addition, the step of pelletizing after further including 1 to 5% by weight of each of a decomposition inhibitor and an antioxidant for preventing decomposition by ultraviolet rays of the polymer contained in the carbon-based material; may further include. At this time, the decomposition inhibitor is composed of hydroxybenzophenone, hydroxyphenyl benzotriazole, arylester, oxanilides, and formamidine. It is made of at least one selected from the group, and the antioxidant is preferably made of at least one selected from the group consisting of phenolic 　 antioxidants, phosphorus 　 antioxidants, sulfur-based antioxidants, amine-based antioxidants.

In addition, in order to verify the effect of the carbon-based material according to the present invention, a carbon-based material was manufactured and compared with the thermal conductivity in the horizontal direction and the thermal conductivity and emissivity in the vertical direction, respectively, as shown in Table 1.

<Comparative Example>

After making a plate from a carbon-based material consisting of 50% by weight of graphite plate-like graphite and 50% by weight of a polyamide resin, the thermal conductivity in the horizontal direction and the thermal conductivity and emissivity in the vertical direction were measured and set as a reference.

<Example 1>

After making a plate with a carbon-based material consisting of 35% by weight of graphite material, plate-like graphite and 20% by weight of spherical graphite, 3% by weight of carbon nanotubes, and 42% by weight of polyamide resin, thermal conductivity in the horizontal direction and thermal conduction in the vertical direction Degree and emissivity were measured respectively.

<Example 2>

After fabricating a plate from a carbon-based material consisting of 25% by weight of graphite plate-like graphite and 30% by weight of spherical graphite, 5% by weight of carbon nanotubes, and 40% by weight of polyamide resin, thermal conductivity in the horizontal direction and thermal conduction in the vertical direction Degree and emissivity were measured respectively.

<Example 3>

After fabricating a plate from a carbon-based material consisting of 30% by weight of graphite plate-like graphite and 20% by weight of spherical graphite, 8% by weight of carbon nanotubes, and 42% by weight of polyamide resin, thermal conductivity in the horizontal direction and thermal conduction in the vertical direction Degree and emissivity were measured respectively.

Referring to Table 1 above, it was confirmed that as the materials for forming the carbon-based material further included spherical graphite and carbon nanotubes, the thermal conductivity in the horizontal direction and the vertical direction increased, respectively, and the emissivity was also increased. In particular, it was confirmed that the thermal conductivity and emissivity further increased as the content of carbon nanotubes increased compared to spherical graphite.

On the other hand, the heat dissipation structure of the present invention is manufactured by injection molding the above carbon-based material. Specifically, the above-described carbon-based material is injected into a block mold by a certain weight unit, and injection-molded for 30 to 90 seconds at a temperature condition of 200 to 350°C and a pressure of 80 to 160 kgf/cm 2 to manufacture a heat dissipating structure. . At this time, the conditions for injection molding are set to perform thermal curing of the polyamide resin or polyphenylene sulfide, which is a binder, and injection molding is performed for about 2 minutes including the time required for natural cooling. Of course, it is possible to further shorten the time required for injection molding by using the forced cooling method instead of the natural cooling method.

In addition, it is preferable that the heat dissipation structure 100 of the present invention is formed with a flat portion 110 on one side and an uneven portion 120 on the other side, as shown in FIG. 2. This is to prevent damage to the flat portion 110 by allowing the uneven portions 120 to engage with each other when the heat radiation structure 100 is stacked. Therefore, in the case of stacking the heat dissipation structure 100 in multiple layers, as shown in FIG. 3, the uneven portions 120 are engaged with each other, and a protective plate 200 is interposed between the flat portions 110 that abut each other. It is possible to protect the part 110 from damage.

As described above and illustrated in connection with some embodiments for illustrating the technical idea of the present invention, the present invention is not limited to the configuration and operation as described above, but the scope of the technical idea described in the description of the invention It will be well understood by those of ordinary skill in the art that a number of changes and modifications can be made to the present invention without departing from it. Accordingly, all such appropriate changes and modifications and equivalents should be considered to be within the scope of the present invention.

100... heat dissipation structure
110...plane
120...
200...protective plate

Claims (5)

At least one graphite material selected from the group consisting of crystalline graphite, synthetic graphite, amorphous graphite, expandable graphite, plate graphite, and nodular graphite is used in a range of 1 to 50 μm. Crushing and homogenizing to size;
Crushing and homogenizing at least one carbon material selected from the group consisting of carbon nanotubes, graphene, and carbon black to a size of 20 to 500 nm;
A carbon material crushed to have a content of 2 to 20% by weight based on the total weight of the dispersion is composed of at least one selected from the group consisting of distilled water, alcohol, dimethylformamide (DMF), methyl ethyl ketone (MEK), and polyol. Dispersing in a solvent to form a carbon material dispersion;
After mixing 80 to 98% by weight of the crushed and homogenized graphite material and 2 to 20% by weight of the carbon material dispersion, putting it into a vacuum stirrer and stirring to form a carbon mixture, then the temperature inside the chamber of the vacuum stirrer is 30 to 50°C. Stabilizing the carbon mixture by descending to;
Mixing 20 to 60% by weight of a carbon mixture and 40 to 80% by weight of a binder made of polyamide resin or polyphenylene sulfide, followed by drying and stirring to form a carbon-based material;
Pelletizing after further including 1 to 5% by weight of each of a decomposition inhibitor and an antioxidant for preventing decomposition of the polymer contained in the carbon-based material by ultraviolet rays; And
Injecting the pelletized carbon-based material into a block mold by a predetermined weight unit, and injection molding for 30 to 90 seconds at a temperature condition of 200 to 350°C and a pressure of 80 to 160 kgf/cm 2 to form a heat dissipating structure; Including,
The decomposition inhibitor is from the group consisting of hydroxybenzophenone, hydroxyphenyl benzotriazole, arylester, oxanilides, and formamidine. It consists of at least one selected,
The antioxidant is made of at least one selected from the group consisting of phenolic antioxidants, phosphorus antioxidants, sulfur antioxidants, and amine antioxidants,
In order to prevent damage to the flat portion 110 by interlocking the uneven portions 120 during stacking, one surface of the heat dissipation structure is formed of a flat portion 110 and the other surface is formed of an uneven portion 120. Manufacturing method.
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