KR101729006B1 - Radiating sheet including carbon fibers, manufacturing method thereof and manufacturing equipment thereof - Google Patents

Radiating sheet including carbon fibers, manufacturing method thereof and manufacturing equipment thereof Download PDF

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KR101729006B1
KR101729006B1 KR1020150104218A KR20150104218A KR101729006B1 KR 101729006 B1 KR101729006 B1 KR 101729006B1 KR 1020150104218 A KR1020150104218 A KR 1020150104218A KR 20150104218 A KR20150104218 A KR 20150104218A KR 101729006 B1 KR101729006 B1 KR 101729006B1
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South Korea
Prior art keywords
film
carbon fiber
heat
carbon
radiating sheet
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KR1020150104218A
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Korean (ko)
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KR20170011501A (en
Inventor
최대규
위순임
이동원
김수봉
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주식회사 뉴파워 프라즈마
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Priority to KR1020150104218A priority Critical patent/KR101729006B1/en
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    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K7/00—Constructional details common to different types of electric apparatus
    • H05K7/20—Modifications to facilitate cooling, ventilating, or heating
    • H05K7/2039—Modifications to facilitate cooling, ventilating, or heating characterised by the heat transfer by conduction from the heat generating element to a dissipating body
    • H05K7/20436—Inner thermal coupling elements in heat dissipating housings, e.g. protrusions or depressions integrally formed in the housing
    • H05K7/20445—Inner thermal coupling elements in heat dissipating housings, e.g. protrusions or depressions integrally formed in the housing the coupling element being an additional piece, e.g. thermal standoff
    • H05K7/20472—Sheet interfaces
    • H05K7/20481—Sheet interfaces characterised by the material composition exhibiting specific thermal properties
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/12—Layered products comprising a layer of synthetic resin next to a fibrous or filamentary layer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/28—Layered products comprising a layer of synthetic resin comprising synthetic resins not wholly covered by any one of the sub-groups B32B27/30 - B32B27/42
    • B32B27/281—Layered products comprising a layer of synthetic resin comprising synthetic resins not wholly covered by any one of the sub-groups B32B27/30 - B32B27/42 comprising polyimides
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/12—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by using adhesives
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/04—Interconnection of layers
    • B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties

Abstract

The present invention relates to a heat-radiating sheet containing carbon fibers, a method of manufacturing the same, and an apparatus for manufacturing the same. The heat-radiating sheet including the carbon fiber of the present invention includes a carbon fiber layer spread in a planar form; An adhesive layer applied to the spread carbon fiber to fix the carbon fiber; And a film layer in the form of a surface in the form of carbon which is supplied and attached to the adhesive layer. The heat-radiating sheet including the carbon fiber of the present invention, the method for producing the same, and the apparatus for manufacturing the same can improve the smoothness of the surface of the heat-radiating sheet, and have excellent thermal conductivity and effective heat dissipation. In addition, a heat-radiating sheet can be formed using a thin film, which is applicable to slim products such as mobile phones and notebooks. In addition, the adhesion of the polyimide film can be improved by further adding carbon nanotubes or carbon black.

Figure R1020150104218

Description

TECHNICAL FIELD [0001] The present invention relates to a heat-radiating sheet containing carbon fibers, a method of manufacturing the same,

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a heat-radiating sheet containing carbon fibers, a method of manufacturing the same, and a manufacturing apparatus thereof, and more particularly, to a heat-radiating sheet including carbon fibers for heat- .

Carbon fibers are most widely used as reinforcing agents for advanced composite materials because of their excellent mechanical properties such as non-strength and nonelasticity. In addition to sports applications such as golf clubs and fishing rods, such carbon fiber applications are being developed for general industrial use such as aircraft, automobile members, compressed natural gas tanks, seismic reinforcing members for dried products, and ship members. And accordingly the level of mechanical properties required is increasing. For example, in aircraft applications, most of the structural members are replaced by carbon fiber reinforced plastics for light weight, and therefore carbon fibers compatible at high levels of compression strength and tensile modulus are required.

Recently, a heat-radiating sheet formed in a sheet form in an electronic product is included to utilize the high thermal conductivity of carbon fiber. The complexity of devices such as televisions, computers, office machines, and communication devices is increasing. Particularly, as electronic components become more complicated, the area is gradually reduced due to miniaturization and high performance, so that the number of electronic components to be assembled increases, while the shape of the component itself is miniaturized. Thus, there is a growing need to effectively remove the heat generated to prevent failures or failures caused by the increase in heat generated in each electronic component. Particularly, small electronic appliances such as mobile phones, tablet PCs, notebooks, etc., must be formed as thin films, while quickly and efficiently dissipating heat. Therefore, a heat-radiating sheet for use in a small-sized electronic product must have a high thermal conductivity while being a thin film.

In general, a heat-radiating sheet using carbon fiber is prepared by melting an adhesive liquid such as a solvent for adhesion to a stretched carbon fiber, coating it, hardening it, and carbonizing and graphitizing it. At this time, a step for smoothing the surface is required in the process of injecting the adhesive liquid for adhesion and drying, and generally a roller is used. However, there is such a disadvantage that the adhesive liquid does not adhere to the roller or the surface is not uniformly treated during the surface treatment using the roller. If the surface is not uniformly treated, the thermal conductivity is lowered in the horizontal direction, and the heat radiation efficiency is lowered.

It is an object of the present invention to provide a heat-radiating sheet including carbon fibers in which heat transfer in a horizontal direction is efficiently performed by increasing the surface smoothness of the heat-radiating sheet using carbon fibers and polyimide films, and a manufacturing method and apparatus thereof.

According to an aspect of the present invention, there is provided a heat-radiating sheet including carbon fiber, a method of manufacturing the heat-radiating sheet, and a manufacturing apparatus. The heat-radiating sheet including the carbon fiber of the present invention includes a carbon fiber layer spread in a planar form; An adhesive layer applied to the spread carbon fiber to fix the carbon fiber; And a film layer in the form of a surface in the form of carbon which is supplied and attached to the adhesive layer.

In one embodiment, the film layer is any one of a polyimide film, a meta-aramid film, and a para-aramid film.

In one embodiment, the adhesive layer comprises any one of phenol, polyimide, polyacrylonitrile, and aramid.

In one embodiment, the heat-radiating sheet further includes a second adhesive layer for enhancing an adhesive force between the polyimide film and the adhesive layer.

In one embodiment, the second adhesive layer includes any one of carbon nanotube and carbon black.

A method of manufacturing a heat-radiating sheet including carbon fiber according to the present invention includes: spreading a carbon fiber bundle in a planar form; Preparing a planar film by carbonization; Applying an adhesive to the spread carbon fiber; Laminating the carbonized film to the carbon fiber to which the adhesive is applied; Carbonizing the laminated carbon fiber sheet; And graphitizing the carbonized carbon fiber sheet.

In one embodiment, in the carbon fiber spreading step, the carbon fibers are spread through the gas.

In one embodiment, the film is one of a polyimide film, a meta-aramid film, or a para-aramid film.

An apparatus for manufacturing a heat-radiating sheet including carbon fibers according to the present invention comprises: a spreading device for spreading a bundle-shaped carbon fiber in a planar form; A film supply module for carbonizing and supplying the film; A laminating module for adhering the film; A carbonization module for carbonizing the laminated carbon fiber and the film; And a graphitization module for graphitizing the carbonized carbon fibers and the film.

In one embodiment, the spreading device includes an air duct for separating bundle-shaped carbon fibers into filaments using a gas.

In one embodiment, the film is one of a polyimide film, a meta-aramid film, or a para-aramid film.

The heat-radiating sheet including the carbon fiber of the present invention, the method for producing the same, and the apparatus for manufacturing the same can improve the smoothness of the surface of the heat-radiating sheet, and have excellent thermal conductivity and effective heat dissipation. In addition, a heat-radiating sheet can be formed using a thin film, which is applicable to slim products such as mobile phones and notebooks. In addition, the adhesion of the polyimide film can be improved by further adding carbon nanotubes or carbon black.

1 is a block diagram showing a configuration of an apparatus for manufacturing a heat radiation sheet according to a preferred embodiment of the present invention.
2 is a view showing a structure of a heat-radiating sheet according to a first embodiment of the present invention.
3 and 4 are a perspective view and a side view showing the heat radiation sheet producing apparatus.
5 is a flowchart showing a method for manufacturing a heat radiation sheet.
6 and 7 are views showing a carbon fiber spreading apparatus.
8 is a view showing a structure of a heat radiation sheet according to a second embodiment of the present invention.

For a better understanding of the present invention, a preferred embodiment of the present invention will be described with reference to the accompanying drawings. The embodiments of the present invention may be modified into various forms, and the scope of the present invention should not be construed as being limited to the embodiments described in detail below. The present embodiments are provided to enable those skilled in the art to more fully understand the present invention. Therefore, the shapes and the like of the elements in the drawings can be exaggeratedly expressed to emphasize a clearer description. It should be noted that the same components are denoted by the same reference numerals in the drawings. Detailed descriptions of well-known functions and constructions which may be unnecessarily obscured by the gist of the present invention are omitted.

1 is a block diagram showing a configuration of an apparatus for manufacturing a heat radiation sheet according to a preferred embodiment of the present invention.

1, an apparatus 100 for manufacturing a heat-radiating sheet according to the present invention includes a carbon fiber supply unit 105, a spreading device 110, a film supply unit 107, a carbonization module 109, an adhesive supply module 120, A laminating module 130, a drying module 140, and a carbonization module 150. A graphitization module 160 and a storage module 170.

The carbon fiber supply part 105 is supplied by winding a bundle of carbon fibers in a roll. The carbon fibers supplied from the carbon fiber supply part 105 are spread in a planar shape while passing through the spreading device 110. The spreading device 110 is a device for spreading a plurality of carbon fiber filaments bundled with a bundle of carbon fiber bundles in a planar form. The carbon fibers fed in the form of a bundle pass through the spreading device 110 and spread out in a planar form.

The adhesive supply module 120 is configured to fix the carbon fibers by applying an adhesive to the carbon fibers spread in a planar shape. The adhesive containing the binder is uniformly spread over the entire spread carbon fiber by using an adhesive supply device. The adhesive is for fixing the spread carbon fiber. The adhesive is a polymer material and includes any one of phenol, polyimide, polyacrylonitrile, and m-aramid. In addition to the polymeric materials mentioned herein, various materials for bonding may be used.

The adhesive supply module 120 according to the present invention does not expose the resin in the air from the resin tank to the slot die by resin impregnation using a slot die, and coating is possible without changing the viscosity of the solvent. In addition, since a resin is supplied by using a metering pump, a proper amount of coating is possible. In addition, it has excellent stability and reproducibility after resin impregnation, and multi-layer coating is possible.

The film supply portion 107 is a portion for supplying a film in the form of a plane. The film may be any one of a polyimide film, a metal-aramid-based film or a para-aramid-based film, and preferably a polyimide film is used.

The polyimide film is a high-temperature, high-functional industrial material that can withstand temperatures as high as 400 degrees Celsius or below 269 degrees Celsius and is thin and flexible. It has strong chemical resistance and abrasion resistance and is widely used in areas that require stable performance in harsh environments. Initially developed and used as materials for the aerospace industry, it is now used in a wide range of fields such as industrial equipment, flexible printed circuit boards (FPCB), and electrical and electronic components. In recent years, the demand for polyimide films for heat-radiating sheets has been increasing in order to solve heat problems as the performance of information technology (IT) devices has become more diverse and thinner all over the world. Hereinafter, a process for producing a heat-radiating sheet containing carbon fibers using a polyimide film will be described.

The carbonization module 109 is a structure for carbonizing the supplied polyimide film. The carbonization module 109 carbonizes the polyimide film at a carbonization temperature of 800 to 1,000 DEG C in a nitrogen (N2) atmosphere. The polyimide film is carbonized and then adhered to the carbon fiber to thereby easily adhere the film to the carbon fiber and prevent film shrinkage caused by carbonization after the film is adhered to the carbon fiber.

The laminating module 130 is a structure for laminating and joining carbonized polyimide films to carbon fibers coated with an adhesive. The laminating module 130 laminate the polyimide film on the carbon fiber coated with the adhesive, and then the polyimide film is bonded by the adhesive to form the heat radiation sheet.

The drying module 140 is configured to dry the heat-radiating sheet laminated in the laminating module 130. The drying module 140 can dry the heat-radiating sheet using, for example, hot air so that the polyimide film adhered to the adhesive can be firmly adhered to the adhesive.

The carbonization module 150 and the graphitization module 160 are configured to carbonize and graphitize the dried heat-radiating sheet. The carbonization module 150 carbonizes the heat radiation sheet at a carbonization temperature of 800 to 1,000 DEG C in a nitrogen (N2) atmosphere. The carbonized heat-radiating sheet is graphitized in the graphitization module 160 at a high temperature of 2,000 DEG C or more. In the graphitization module 160, a heat-radiating sheet is inserted between the graphite plates to maintain proper pressure, thereby preventing the heat-radiating sheet from being deformed. The completed heat-radiating sheet is stored in the storage module 170.

2 is a view showing a structure of a heat-radiating sheet according to a first embodiment of the present invention.

2, the heat-radiating sheet 200 manufactured through the heat-radiation sheet manufacturing apparatus 100 includes carbon fibers 101, a first adhesive layer 124, and a carbonized polyimide film 182 spread in a planar shape. . The carbon fibers 101 are formed by spreading a bundle-shaped carbon fiber in a planar form. The first adhesive layer 124 bonds the polyimide film 182 that is laminated while fixing the carbon fibers spread in the planar form so that the planar shape can be maintained.

The heat-radiating sheet 200 is formed by adhering the carbonized polyimide film 182 to the spread carbon fiber 101, thereby improving overall smoothness. Therefore, thermal conductivity in the horizontal direction is improved, and rapid heat dissipation is possible. In addition, since the polyimide film 182 is carbonized and then adhered, the heat-radiating sheet 200 can be manufactured as a thin film, so that it can be used in small-sized electric appliances.

FIGS. 3 and 4 are a perspective view and a side view showing a heat radiation sheet production apparatus, and FIG. 5 is a flow chart showing a heat radiation sheet production method.

3 to 5, the carbon fibers 103 wound on the roll in the form of a bundle are spread in a planar shape while passing through the spreading device 110 (S100). The adhesive liquid supplied from the adhesive liquid supply device 122 is injected and applied to the carbon fibers 101 spread in a planar form (S110). The polyimide film 180 is supplied to the carbonization module 109 and the carbonized polyimide film 182 is formed by carbonization in the carbonization module 109 (S120). The carbon fiber 101 coated with the adhesive liquid and the carbonized polyimide film 182 are laminated in the laminating module 130 (S130). At this time, the carbon fiber 101 and the carbonized polyimide film 182 are laminated and laminated using the rolling roller 132 included in the laminating module 130. The laminated carbon fiber 101 and the carbonized polyimide film 182 undergo a drying step (S140). Thereafter, the carbonization process is performed in the carbonization module 150 (S150), and the graphitization module 160 performs the graphitization process (S160) to form the carbon fiber heat-dissipating sheet 200. The carbonization process and the graphitization process are generally carried out during the production of carbon fiber. The heat-radiating sheet manufacturing apparatus may be formed in a continuous process or may be batch-processed so that the carbon fibers 101 can be continuously processed, as shown in the figure. In the continuous process, the carbon fibers 101 are supported and moved by the plurality of guide rollers 102.

6 and 7 are views showing a carbon fiber spreading apparatus.

Referring to FIG. 6, the spreading device 110 is a device for spreading the carbon fiber bundle 103 in a planar form. The spreading device 110 is provided with a plurality of guide rollers 114 for supporting and moving the carbon fibers 103 and 101 in the frame 112. The carbon fiber bundle 103 supported by the guide roller 114 and introduced into the spreading device 110 is unfolded on a filament basis by a gas injected from an air duct 116 provided on the carbon fiber bundle 103. The air duct 116 may be installed at an upper portion or a lower portion of the spreading device 110 so that the gas may be sprayed onto the upper or lower portion of the carbon fiber bundle 103.

Referring to FIG. 7, the carbon fiber bundle 103 moves past the lower portion of the air duct 116. At this time, a plurality of injection nozzles 117, which are linearly formed at the lower portion of the air duct 116 and have gas injection holes, are provided. And the gas is supplied through the injection nozzle 117. The gap between the filaments of the carbon fiber 101 is widened in order to secure the channel while the gas passes between the filaments of the carbon fiber 101, and the filaments are gradually spread and spread in a planar form. At this time, heat of the softening point of the sizing agent may be applied or the sizing agent may be removed in order to lower the gathering force between the carbon fibers 101. In addition, the tension difference in the longitudinal direction of the carbon fiber is controlled by the speed difference of the driving motor, thereby determining the width and shape of the carbon fiber.

8 is a view showing a structure of a heat radiation sheet according to a second embodiment of the present invention.

Referring to Fig. 8, the heat-radiating sheet 200a is formed by further adding a second adhesive layer 126 to the heat-radiating sheet 200 in the first embodiment. The heat-radiating sheet 200a is formed by applying an adhesive to the planar carbon fiber 101 to form a first adhesive layer 124 and further applying an adhesive to improve the role of the filler and the adhesive strength to further form the second adhesive layer 126 do. The second adhesive layer 126 is formed of any one of carbon nanotubes (CNTs) or carbon blacks.

The embodiments of the heat-radiating sheet including the carbon fiber of the present invention, the method of manufacturing the same, and the apparatus for manufacturing the heat-radiating sheet of the present invention described above are merely illustrative and those skilled in the art can make various changes and modifications It will be appreciated that other equivalent embodiments are possible.

Accordingly, it is to be understood that the present invention is not limited to the above-described embodiments. Accordingly, the true scope of the present invention should be determined by the technical idea of the appended claims. It is also to be understood that the invention includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention as defined by the appended claims.

100: Heat-radiating sheet manufacturing apparatus 101: Carbon fiber
102: guide roller 103: carbon fiber bundle
105: carbon fiber supply part 107: film supply part
109: Carbonization module 110: Spreading device
112: frame 114: guide roller
116: Air duct 117: Injection nozzle
120: adhesive supply module 124: first adhesive layer
126: second adhesive layer 130: laminating module
132: Rolling roller 140: Drying module
150: carbonization module 160: graphitization module
170: storage module 180: polyimide film
182: Carbonated polyimide film 200, 200a: Heat-radiating sheet

Claims (11)

A carbon fiber layer in which bundle type carbon fibers are spread by filament unit by a gas injected linearly from the jet nozzle and are formed in a plane shape;
An adhesive layer applied on one side of the spread carbon fiber layer to fix the carbon fiber; And
And a film layer in the form of a planar surface which is carbonized and supplied and laminated and adhered to the adhesive layer,
Wherein the carbon fiber layer, the adhesive layer, and the film layer bonded together are carbonized and graphitized. The method according to claim 1,
Wherein the film layer is one of a polyimide film, a meta-aramid film, and a para-aramid film. delete The method according to claim 1,
Wherein the heat-radiating sheet further comprises a second adhesive layer for enhancing an adhesive force between the film layer and the adhesive layer. 5. The method of claim 4,
Wherein the second adhesive layer comprises any one of carbon nanotubes and carbon black. Preparing a carbon fiber bundle by spreading a bundle of carbon fibers on a filament basis using a gas injected from an injection nozzle linearly provided in an air duct, in a planar form;
Preparing a planar film by carbonization;
Applying an adhesive to one side of the spread carbon fiber;
Laminating the carbonized film to the carbon fiber to which the adhesive is applied;
Carbonizing the laminated carbon fiber sheet; And
A method for producing a heat-radiating sheet comprising carbon fiber, comprising the step of graphitizing a carbonized carbon fiber sheet. delete The method according to claim 6,
Wherein the film is one of a polyimide film, a meta-aramid film, and a para-aramid film. A spreading device for spreading bundle-shaped carbon fibers in a filament unit to form into a planar shape;
A film supply module for carbonizing and supplying the film;
A laminating module for adhering the film;
A carbonization module for carbonizing the laminated carbon fiber and the film; And
And a graphitization module for graphitizing the film with carbonized carbon fibers,
The spreading device includes a frame;
A plurality of guide rollers for supporting the carbon fibers in the frame and moving the carbon fibers spread in a plane;
An air duct provided at an upper portion or a lower portion of the carbon fiber bundle; And
And a plurality of injection nozzles linearly provided in the air duct and through which gas is injected. delete 10. The method of claim 9,
Wherein the film is one of a polyimide film, a meta-aramid film, and a para-aramid film.

KR1020150104218A 2015-07-23 2015-07-23 Radiating sheet including carbon fibers, manufacturing method thereof and manufacturing equipment thereof KR101729006B1 (en)

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KR101971220B1 (en) * 2017-12-07 2019-04-22 한국세라믹기술원 METHOD OF FABRICATING FIBROUS SiC SURFACE HEATING ELEMENT FOR INFRARED RADIATION
KR102094925B1 (en) * 2018-05-03 2020-03-30 에스케이씨 주식회사 Multilayer graphite sheet having excellent electromagnetic shielding property and thermal conductivity, and preparation method thereof
SE543441C2 (en) * 2019-03-26 2021-02-16 Centropy Ab Heat transfer device

Citations (2)

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Publication number Priority date Publication date Assignee Title
JP2000016808A (en) * 1998-04-28 2000-01-18 Matsushita Electric Ind Co Ltd Method and apparatus for producing graphite sheet having flexibility
JP2015000553A (en) * 2013-06-18 2015-01-05 トヨタ自動車株式会社 Filament winding device

Patent Citations (2)

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Publication number Priority date Publication date Assignee Title
JP2000016808A (en) * 1998-04-28 2000-01-18 Matsushita Electric Ind Co Ltd Method and apparatus for producing graphite sheet having flexibility
JP2015000553A (en) * 2013-06-18 2015-01-05 トヨタ自動車株式会社 Filament winding device

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