WO2023210946A1 - Procédé de fabrication de feuille de dissipation de chaleur en graphite pour écran d'affichage - Google Patents

Procédé de fabrication de feuille de dissipation de chaleur en graphite pour écran d'affichage Download PDF

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WO2023210946A1
WO2023210946A1 PCT/KR2023/002835 KR2023002835W WO2023210946A1 WO 2023210946 A1 WO2023210946 A1 WO 2023210946A1 KR 2023002835 W KR2023002835 W KR 2023002835W WO 2023210946 A1 WO2023210946 A1 WO 2023210946A1
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Prior art keywords
graphite
sheet
heat dissipation
weight
coating
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PCT/KR2023/002835
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English (en)
Korean (ko)
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이현호
윤성영
남신우
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인동첨단소재(주)
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B5/00—Electrostatic spraying apparatus; Spraying apparatus with means for charging the spray electrically; Apparatus for spraying liquids or other fluent materials by other electric means
    • B05B5/025—Discharge apparatus, e.g. electrostatic spray guns
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D1/00—Processes for applying liquids or other fluent materials
    • B05D1/02—Processes for applying liquids or other fluent materials performed by spraying
    • B05D1/04—Processes for applying liquids or other fluent materials performed by spraying involving the use of an electrostatic field
    • B05D1/06—Applying particulate materials
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D1/00—Processes for applying liquids or other fluent materials
    • B05D1/02—Processes for applying liquids or other fluent materials performed by spraying
    • B05D1/12—Applying particulate materials
    • 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
    • B32B37/14—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers
    • B32B37/24—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers with at least one layer not being coherent before laminating, e.g. made up from granular material sprinkled onto a substrate
    • 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
    • B32B38/00—Ancillary operations in connection with laminating processes
    • 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
    • B32B9/00—Layered products comprising a layer of a particular substance not covered by groups B32B11/00 - B32B29/00
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/34—Silicon-containing compounds
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L67/00—Compositions of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Compositions of derivatives of such polymers
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D163/00—Coating compositions based on epoxy resins; Coating compositions based on derivatives of epoxy resins
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
    • C09D5/03—Powdery paints
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
    • C09D7/40—Additives
    • C09D7/60—Additives non-macromolecular
    • C09D7/61—Additives non-macromolecular inorganic

Definitions

  • the present invention relates to a coating method for a graphite heat dissipation sheet for a display panel, and more specifically, to improve the heat dissipation performance of the display panel by improving the conventional method of laminating a film on the surface of graphite to form a coating layer using a coating agent. It relates to a coating method of a graphite heat dissipation sheet forming a .
  • Heat dissipation sheets made of graphite materials such as expanded graphite have problems such as dust or scattering occurring when processed into sheets or structures due to the nature of graphite materials having low hardness, and low mechanical properties and insulation properties.
  • a protective sheet is laminated on the surface to prevent dust or scattering generated from the graphite and to secure mechanical properties.
  • the applicant has developed a method of laminating a protective sheet on a graphite heat dissipation sheet through Korean Patent Publication No. 10-2148670. Recently, in order to solve the problem of heat generation due to the miniaturization of electronic devices using heat dissipation sheets and the miniaturization of electronic devices, there is a trend toward installing a heat dissipation sheet of the same size as the mounting area of the electronic device when installing the graphite heat dissipation sheet. As in the prior art, the method of laminating protective sheets without a bezel can be said to be useful.
  • heat dissipation is achieved through complex processes such as cutting to create a step of less than 1 mm on the inside compared to the outer size of the heat dissipation sheet, lamination of the lower and upper protective sheets, and adding padding around the perimeter. Because sheets must be manufactured, mass production is difficult and there are negative problems in terms of economic feasibility of the process.
  • Korean Patent Publication No. 10-1430235 a technology for forming a coating protective film made of polydimethylsiloxane resin with insulating properties is disclosed in Korean Patent Publication No. 10-1430235.
  • This is an electrostatic coating technology using a coating solution containing 30 to 90 parts by weight of a mixture of graphene and graphite and 2 to 10 parts by weight of a silicone dispersant per 1000 parts by weight of solvent.
  • This is a coating method using a liquid coating agent.
  • Korean Patent Publication No. 10-2333315 the applicant has developed a coating method for a heat dissipation sheet that forms a coating layer using a coating agent by improving the conventional method of laminating a film on the surface of graphite. Applying this coating method can improve the efficiency of the coating process because a coating layer can be formed on the graphite surface using a non-contact coating method using powder coating.
  • the present invention was developed in consideration of the above-described prior art, and is an improved graphite that improves the heat resistance of the coating layer formed on the surface of the graphite by a non-contact coating method using powder coating to exhibit performance suitable for application to a display panel.
  • the purpose is to provide a method of manufacturing a heat dissipation sheet.
  • the manufacturing method of the graphite heat dissipation sheet of the present invention to solve the above problems includes the steps of electrostatically spraying powder coating on the surface of the graphite sheet to form a coating layer on the graphite surface, and fixing the lower protective sheet to the bottom of the laminate. Steps, laminating the graphite sheet on the lower protective sheet, adding cushioning material to four peripheral surfaces of the graphite sheet, manufacturing a laminate by laminating an upper protective sheet on top of the graphite sheet. It is characterized in that it includes the step of laminating the laminate by passing it through a lamination roller.
  • the powder coating used to form the coating layer is 30 to 40% by weight of ortho-cresol novolac epoxy resin with a softening point of 70 to 90°C and 60 to 70% by weight of bisphenol A type epoxy resin with a softening point of 110 to 120°C. It is characterized in that it contains 80 to 90 parts by weight of an epoxy resin, 10 to 30 parts by weight of a polyester resin containing a carboxyl group at the terminal, 0.1 to 5 parts by weight of a curing accelerator, and 20 to 30 parts by weight of a layered clay mineral.
  • the graphite heat dissipation sheet may be made of any one of natural graphite, artificial graphite, expanded graphite, graphene, and Kish graphite, or a combination thereof.
  • the step of forming the coating layer may include simultaneously coating the front, back, and edges of the graphite heat dissipation sheet.
  • a coating layer is formed on the surface of the graphite using a non-contact coating method using powder coating on the surface of the graphite sheet, thereby improving the heat dissipation characteristics of the manufactured heat dissipation sheet, making it suitable for application to a display panel. performance can be expressed.
  • Figure 1 is a process diagram showing the manufacturing process of a graphite heat dissipation sheet according to the present invention.
  • the manufacturing method of the graphite heat dissipation sheet of the present invention includes the steps of forming a coating layer on the surface of the graphite by electrostatically spraying powder coating on the surface of the graphite sheet, fixing the lower protective sheet to the bottom of the press, and attaching the graphite sheet to the lower part.
  • the coating method of forming a coating layer on the surface of the graphite by electrostatically spraying powder coating on the surface of the graphite sheet is a method disclosed in Korean Patent Publication No. 10-2333315 developed by the applicant, and the present invention improves the coating method to provide a display This is to obtain the physical properties of a heat dissipation sheet suitable for application to.
  • the process for coating the surface of the heat dissipation sheet includes a method of manufacturing a coated heat dissipation sheet by coating, drying and curing paint on the upper and lower surfaces of the heat dissipation sheet and then cutting it, and a method of cutting the heat dissipation sheet first and then cutting the cut material.
  • the method of applying paint to the upper and lower surfaces, drying and curing can perform coating as a continuous process while transporting the heat dissipation sheet, but there is a problem in that the heat dissipation sheet of the desired quality cannot be manufactured because the coating layer is formed unevenly. If the heat dissipation sheet is cut and then coated sequentially in the order of the top, bottom, and edges, the thickness deviation of the coating layer can be reduced, but the process becomes complicated and is not economically feasible, making it difficult to apply to the actual manufacturing process.
  • the applicant performed a coating process for a graphite heat dissipation sheet using an electrostatic spray coating method using powder coating instead of the commonly used liquid coating agent.
  • the coating process has the advantage of coating the front, back, and edges of the heat dissipation sheet at the same time, so the number of coating processes can be reduced and process efficiency can be improved accordingly, and the problem of uneven drying that occurred with liquid coatings is also eliminated. It turned out that it could be resolved.
  • the powder coating of the present invention is an epoxy resin 80 to 90% composed of 30 to 40% by weight of ortho-cresol novolak epoxy resin with a softening point of 70 to 90°C and 60 to 70% by weight of bisphenol A type epoxy resin with a softening point of 110 to 120°C. It is characterized in that it contains 10 to 30 parts by weight of a polyester resin containing a carboxyl group at the terminal, 0.1 to 5 parts by weight of a curing accelerator, and 20 to 30 parts by weight of layered clay mineral.
  • epoxy resin which is widely used in epoxy-based powder coating, was used, especially bisphenol A type epoxy resin, which has excellent chemical resistance, adhesiveness, and high temperature characteristics.
  • the epoxy resin causes partial peeling of the layered clay mineral used as an inorganic filler in the powder coating, and to prevent this, a neutral surfactant that does not react with the interlayer ions of the layered clay mineral is added to prevent layer peeling. did. Nevertheless, when placed in a continuous heating environment, layer peeling occurs and heat dissipation efficiency is reduced. In particular, when used in applications that are exposed to high temperature environments for a long time, such as high-resolution displays, there is a problem of reduced adhesive strength.
  • Ortho-cresol novolak epoxy resin which is generally used as a semiconductor molding material, is known to have physical properties for epoxy molding depending on the softening point. For example, it is known that as the softening point increases, there is no change in physical properties such as flexural modulus, coefficient of thermal expansion in the glass phase, and thermal conductivity, but the glass transition temperature increases and spiral flow decreases. This is presumed to be because the crosslinking density increases under conditions where the softening point increases, that is, under conditions where the molecular weight increases.
  • an ortho-cresol novolak epoxy resin with an appropriate softening point can reduce the problem of interlayer delamination as alkyl chains are inserted into the layers, and durability can be strengthened so that adhesion can be maintained even when exposed to a high temperature environment. .
  • the present invention 30 to 40% by weight of ortho-cresol novolac epoxy resin with a softening point of 70 to 90°C and 60 to 70% by weight of bisphenol A type epoxy resin with a softening point of 110 to 120°C are used as the epoxy resin.
  • the softening point range and content range were experimentally optimized, and when the content of the epoxy resin was outside the above range, coating defects occurred in the coating process using powder coating or the durability of the coating layer was found to be reduced, especially over time. It was found that the decrease in heat dissipation performance increased.
  • the bisphenol A type epoxy resin it is particularly preferable to use an epoxy resin having an epoxy equivalent weight of 190 to 220 g/eq. If the epoxy equivalent is too low, there are problems with the storage and chipping properties of the powder coating, and if the epoxy equivalent is too high, there are problems with the appearance and productivity of the coating layer. In addition, it is preferable to use a bisphenol A novolak-based epoxy resin containing a novolac group for the purpose of improving chipping properties and productivity after applying the powder coating.
  • the epoxy resin is contained in the range of 80 to 90 parts by weight. If the content of the epoxy resin is too small, there is a problem that the adhesion to the graphite surface decreases, and if it is too much, the curing speed and edge covering power decrease, etc. Problems arise.
  • the epoxy resin is used in a larger amount compared to the powder coating of the prior art, because even if it contains a large amount of epoxy resin, the peeling phenomenon of layered clay minerals does not occur, thereby improving adhesion.
  • the powder coating of the present invention contains a polyester resin containing a carboxyl group at the terminal as a curing agent.
  • the carboxyl group located at the end of the polyester resin promotes the ring-opening reaction of the epoxy in the presence of a base catalyst, thereby promoting curing of the epoxy resin.
  • the polyester resin containing a carboxyl group at the terminal is preferably contained in the range of 10 to 30 parts by weight. If the content of the curing agent is too small, uncured parts may occur, and if it is too much, the physical properties of the coating layer may deteriorate, which may deteriorate the physical properties of the graphite heat dissipation sheet.
  • the polyester resin containing a carboxyl group at the terminal can be produced by reacting a carboxylic acid having 1 to 3 carbon atoms and a polyester resin under a base catalyst.
  • the powder coating contains a curing accelerator, and a compound containing a functional group at the end group that can accelerate curing is used.
  • the curing accelerator may be one selected from amine-based, imidazole-based, and benzoyl peroxide, or a mixture thereof.
  • Examples of the imidazole-based curing accelerator include 2-methyl imidazole, and examples of the amine-based curing accelerator include amine adduct.
  • the curing accelerator is contained in the range of 0.1 to 5 parts by weight. If the content of the curing accelerator is too small, there is a problem that the curing time becomes longer, and if the content of the curing accelerator is too much, the curing time is reduced, but the appearance of the coating layer deteriorates and surface unevenness increases. Problems may occur.
  • layered clay mineral is used as an inorganic filler.
  • the layered clay mineral is also used in Korean Patent Publication No. 10-2333315, and as described above, the present invention uses an ortho-cresol novolac epoxy resin to suppress delamination of the layered clay mineral.
  • the layered clay mineral has a layered structure such as halloysite, kaolinite, smectitie, montmorillonite, hectorite, saponite, or vermiculite.
  • layered structure such as halloysite, kaolinite, smectitie, montmorillonite, hectorite, saponite, or vermiculite.
  • examples include clay minerals containing silicate or silica alumina components.
  • the layered clay mineral has a large surface area of more than 800 m2 on average per gram, and has a structure in which tens to hundreds of very thin sheets with a thickness of 1 nm and a length of about 30 nm to 1,000 nm are stacked, so this layered structure
  • very small fillers are created, which could not be expected from existing polymer composite materials in which the inorganic filler is introduced into the polymer medium in an agglomerated state of several micrometers or more. It has been reported that the content alone can increase mechanical properties several times compared to those of polymer resins, as well as changes in various physical properties such as heat resistance, electrical properties, and gas barrier properties.
  • the distance between layers can be adjusted, and since synthesis is simple, it is suitable for use as a filler.
  • the interlayer distance is about 0.7 nm, so due to the nature of layered clay minerals with an interlayer distance of 0.9 to 1.0 nm in the contracted state, heat dissipation characteristics are excellent when forming a coating layer adjacent to graphite without adjusting the interlayer distance.
  • the layered clay mineral has different interlayer distances depending on its crystal structure.
  • kaolinite as measured by X-ray diffraction, has an interlayer distance of about 7 ⁇
  • smectite which has the widest interlayer distance
  • the phase transition temperature was evaluated to be at least 600°C or higher, making it a material capable of exhibiting high heat resistance properties.
  • the halloysite is a layered clay mineral made of aluminosilicate (Al 2 Si 2 O 5 (OH) 4 ) with a structure similar to kaolinite, and has a characteristic structure in which water molecules exist between layers, so it is exposed to X-rays in a dehydrated state.
  • the interlayer distance measured by diffraction is 7 ⁇ , but in the hydrated state, the interlayer distance changes to 10 ⁇ . Due to these characteristics, the possibility of alkyl chains being inserted into the layer when polymers are mixed can be suppressed, and in particular, compatibility with the epoxy resin of the present invention was evaluated as excellent. For this reason, unlike the powder coatings of the prior art, there is no need to separately mix a neutral surfactant to suppress layer peeling.
  • the layered clay mineral is used in the range of 20 to 30 parts by weight.
  • the heat dissipation effect of the powder coating can be further improved by increasing the content of layered clay minerals. If the content of the layered clay minerals is too small, sagging of the coating layer occurs, the hiding power is reduced, and heat dissipation performance is reduced. If it is too much, the relative content of the resin may decrease and the physical properties of the coating layer may deteriorate, so it is preferable to use it within the above range.
  • additives such as anti-foaming agents, gloss control agents, and dispersants can be added.
  • it is preferable to use it in the range of 0.1 to 5 parts by weight. If the content of the additive is too small, it is no different from when the additive is not used, so it is not effective. If it is too high, the effect of mixing the additive does not increase, making it uneconomical and in some cases, it may cause problems with the appearance of the coating layer. .
  • the electrostatic spray coating method is a method of attaching powder coating to the surface using electrostatic power, so simultaneous coating is possible on the entire surface of the graphite sheet.
  • a cutting process of cutting the graphite sheet to the required size a painting process of mounting the cut graphite sheet in an electrostatic spray coating device and coating the surface with powder coating, and heat treating the painted graphite sheet to attach the powder coating to the surface.
  • a coating layer can be formed on the surface of graphite by heat treatment and hardening. The heat treatment involves curing the powder coating coated at a temperature of 50 to 250°C, preferably 50 to 150°C, for 30 seconds to 3000 minutes, preferably 5 to 20 minutes, and 2 to 300 minutes depending on process conditions.
  • a coating layer with a thickness of ⁇ m, preferably 10 to 100 ⁇ m, can be formed.
  • the manufactured graphite sheet since it must be able to secure physical properties equivalent to those of laminating ordinary protective sheets, the manufactured graphite sheet must have bending resistance of 1.5 inches or less, pencil hardness of B or more, and impact resistance of 5 kg ⁇ cm or more. .
  • a coating layer can be formed on the surface of a graphite heat dissipation sheet that is difficult to coat, making it possible to finish the graphite heat dissipation sheet more economically and efficiently than the existing method of laminating protective sheets.
  • Step (b) fixing the lower protective sheet to the bottom of the press and laminating the graphite sheet on the lower protective sheet (c), adding cushioning material to the four circumferences of the graphite sheet (d), Step (e) of manufacturing a laminate by laminating an upper protective sheet on top of the graphite sheet.
  • a graphite heat dissipation sheet can be manufactured including the step (f) of laminating the laminate by passing it through a lamination roller.
  • the graphite heat dissipation sheet is formed along the circumference of the graphite sheet with a tolerance of less than 1 mm as in Korean Patent Publication No. 10-2148670 to form a bezel-less structure when combining the upper and lower protective sheets made of acrylic material.
  • a bezel can also be formed.
  • the cushioning material serves to seal the graphite heat dissipation sheet manufactured by adding it along the circumference of the graphite sheet.
  • the coating layer is The formed graphite sheet is inserted into the jig and fixed.
  • the stand jig may be a square-shaped frame, or may be installed only at four corners to fix the positions of the four corners of the graphite sheet.
  • Materials for the cushioning material include poron, polycarbonate, and silicone resin. Since the cushioning material can seal along the circumference of the graphite sheet, it is possible to block graphite dust from being exposed to the outside. Additionally, because a coating layer is formed on the surface of the graphite sheet itself, the possibility of graphite dust being exposed to the outside can be significantly reduced.
  • the top of the lamination machine is moved to stack an upper protective sheet on top of the graphite sheet, and the laminate is passed through a lamination roller to proceed with laminating. Through this, the graphite heat dissipation sheet is completed.
  • the pressing process conditions can be changed by varying the diameter of the lamination roller according to the type or thickness of the graphite heat dissipation sheet.
  • the manufactured graphite heat dissipation sheet can be first cut using a shearing machine, and fin processing can be performed after cutting is completed.
  • the finished product can be obtained by inserting the graphite heat dissipation sheet with fin processing into a Thomson machine equipped with a wooden mold, aligning the center with a pin, and performing a punching process. This post-processing process can be performed according to the process of manufacturing a normal heat dissipation sheet.
  • the lower protective sheet and/or upper protective sheet may be made of double-sided tape.
  • release paper can be laminated on the outer surface of the lower protective sheet and/or upper protective sheet, and when mounting the graphite heat dissipation sheet, the release paper is removed and the lower protective sheet and/or upper protective sheet are placed on the desired surface.
  • the graphite heat dissipation sheet can be fixed through an adhesive process.
  • only the lower protective sheet uses double-sided tape
  • the upper protective sheet can use single-sided tape, which can be appropriately selected depending on the purpose of the heat dissipation sheet.
  • a graphite sheet was manufactured as follows and its physical properties were evaluated.
  • the graphite sheet with a thickness of 500 to 920 ⁇ m manufactured by Indong Advanced Materials was used.
  • the graphite sheet was fixed and electrostatic spray painting was applied under a constant voltage of 70 kV.
  • the coating process was performed with the distance between the spray gun and the object to be coated at 25 cm and the flow rate in the booth at 0.4 m/sec.
  • the powder coating for performing the coating process was prepared by mixing the ingredients and contents as shown in Table 1.
  • Table 1 the units are parts by weight, and Comparative Example 3 was prepared according to the example of Korean Patent Publication No. 10-2333315.
  • Example 1 Example 2 Comparative Example 1 Comparative example 2 Comparative Example 3 EOCN-1020 35 EOCN-1025 32 50 EOCN-1027 32 BPA 65 65 65 45 70 C-PE 20 20 20 20 20 20 20 2-MI 1.5 1.5 1.5 1.5 2 rental site hectorite 20 poloxamer 407 2 EOCN-1020: Ortho-cresol novolac epoxy resin, softening point 83°C EOCN-1025: Ortho-cresol novolac epoxy resin, softening point 72°C EOCN-1027: Ortho-cresol novolac epoxy resin, softening point 65°C BPA: Bisphenol A novolak-based epoxy resin, MF-8120, softening point 118°C C-PE: Polyester resin containing a carboxyl group at the terminal 2-MI: 2-methyl imidazole
  • Example 1 Example 2 Comparative Example 1 Comparative example 2 Comparative example 3 Flexibility (inch) 1.1 1.0 1.3 1.2 1,2 pencil hardness 2H 2H F F F Impact resistance (kgcm) 6 7 6 5 6
  • the heat diffusion ability of the graphite sheet coated by the coating method of the present invention was tested.
  • the graphite sheet was cut into a size of 100 mm x 10 mm (length x width), and double-sided tape was attached to one side of the electromagnetic wave shielding layer and attached to the heating block. Afterwards, the temperature of the heating block was raised to 90 ⁇ 2°C.
  • the heating block was sealed in a box and stabilized for 10 minutes, and the temperature of the stabilized sample was measured using an infrared camera.
  • the highest temperature (hot spot) and lowest temperature (cold spot) of the graphite sheet were obtained from the measured temperature, and the temperature difference ( ⁇ T) between the hot spot and cold spot was evaluated as heat diffusion ability.
  • ⁇ T temperature difference
  • Example 1 Example 2 Comparative Example 1 Comparative example 2 Comparative Example 3 Thermal diffusion capacity ( ⁇ T) 20.62 20.85 26.12 22.35 20.78 Peel strength (gf/hole) 338 336 292 309 312
  • the graphite sheets of Examples 1 and 2 were found to have excellent heat diffusion ability and the peel strength of the through hole was relatively high, indicating the durability of the coating layer formed on the surface of the graphite sheet and the degree of improvement in heat dissipation effect due to the coating layer. was evaluated as excellent.
  • the heat diffusion ability and peel strength were found to be higher compared to Comparative Example 3 using a prior art powder coating. Therefore, the graphite heat dissipation sheet manufactured by laminating the graphite sheets of the present invention with a coating layer was evaluated to have heat dissipation characteristics suitable for application to displays with greatly increased heat generation, such as 8K UHD displays.

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  • Laminated Bodies (AREA)

Abstract

La présente invention concerne un procédé de fabrication d'une feuille de dissipation de chaleur en graphite, le procédé comprenant les étapes consistant à : peindre par pulvérisation électrostatique une peinture en poudre sur la surface d'une feuille en graphite pour former une couche de revêtement sur la surface en graphite; fixer une feuille de protection inférieure au fond d'un laminateur; stratifier la feuille en graphite sur la feuille de protection inférieure; placer un matériau tampon sur quatre côtés périphériques de la feuille en graphite; stratifier une feuille de protection supérieure sur la feuille en graphite pour préparer un stratifié; et faire passer le stratifié à travers un rouleau de stratification pour soumettre le stratifié à un traitement de stratification, la peinture en poudre comprenant : 80 à 90 parties en poids d'une résine époxyde contenant 30 à 40 % en poids d'une résine époxyde novolaque ortho-crésol ayant un point de ramollissement de 70 à 90 °C et 60 à 70 % en poids d'une résine époxyde bisphénol A ayant un point de ramollissement de 110 à 120 °C; 10 à 30 parties en poids d'une résine polyester contenant un groupe carboxyle à son extrémité; 0,1 à 5 parties en poids d'un accélérateur de polymérisation; et 20 à 30 parties en poids d'un minéral argileux stratifié.
PCT/KR2023/002835 2022-04-28 2023-03-02 Procédé de fabrication de feuille de dissipation de chaleur en graphite pour écran d'affichage WO2023210946A1 (fr)

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KR102448953B1 (ko) * 2022-04-28 2022-09-30 인동첨단소재(주) 디스플레이 패널용 그라파이트 방열시트의 제조방법.

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