KR101924567B1 - Heat-dissipative shielding sheet and preparation method thereof - Google Patents

Abstract

The present invention relates to a heat dissipation shielding sheet and a method of manufacturing the same. The present invention provides a heat dissipation shielding sheet including a plastic resin and a graphene or graphite sheet, which is generated in an LED light source of an edge type BLU It is possible to improve the energy efficiency of the light emitted from the liquid crystal display, thereby improving the luminance of the liquid crystal display. In addition, it is possible to solve the problem of a reduction in the image quality of the liquid crystal display due to the occurrence of sheet wrinkles and tears caused by the heat and uneven heat generated from the LED light source, and shortening the lifetime of the LED panel. Therefore, the BLU including the heat radiation shielding sheet has high energy efficiency, low optical characteristics, and excellent durability, so that the brightness, image quality, and life of the liquid crystal display using the BLU can be improved.

Description

TECHNICAL FIELD [0001] The present invention relates to a heat dissipation shielding sheet and a method of manufacturing the same. BACKGROUND ART [0002]

The present invention minimizes the loss of light leaking inside the backlight unit system, thereby increasing the energy efficiency of light and diffusing uneven heat generated from the light source to prevent deformation such as sheet wrinkles and tears. And a method for producing the same.

Since a liquid crystal display (LCD) widely used as a flat panel display is a light-receiving device that displays an image by adjusting the amount of light coming from the outside, a backlight source form A backlight unit (BLU) is required. BLU is a device that can display information by supplying lamp light to an LCD that can not emit light by itself.

Such a BLU is a top-down method in which a light source is placed on the bottom of a liquid crystal panel to directly illuminate the entire surface of the liquid crystal panel, and an edge method in which a light source is disposed on one side or both sides of the liquid crystal panel, (Edge illumination system). In general, edge-type BLUs are adopted because of slimness of display electronic devices, low power consumption, and high performance.

The light source used in the edge type BLU mainly uses a light emitting diode (LED). In the LED, more than 80% of the power inputted as a point light source is converted into thermal energy, which causes sheet deformation due to heat generated from the light source, image unevenness, and shortening of the life of the LCD panel. Therefore, the heat generated from the LED light source must be quickly released to the outside to prevent the electronic device from being damaged by heat. In addition, it is important to minimize the light loss of the light emitted from the BLU LED light source in order to increase the energy efficiency of light due to low power consumption. Therefore, there is a demand for a heat-radiating sheet for discharging heat energy generated inside the system to the outside, and a shielding sheet for preventing loss of light leaked inside the BLU system.

Korean Patent Laid-Open Publication No. 10-2011-0082327 discloses a reflective sheet having a surface protective layer having unevenness on one surface thereof and minimizing deformation due to heat by constituting a reflective film and a transparent film. However, such a conventional reflective sheet does not emit or diffuse heat generated from a light source, and thus has a limitation in preventing deformation due to heat. Korean Patent Laid-Open Publication No. 10-2016-0034035 discloses an LED lighting having a heat-radiating sheet and a shielding sheet, but the patent discloses a shielding sheet made of a metal such as aluminum.

Korean Patent Publication No. 10-2011-0082327 Korean Patent Publication No. 10-2016-0034035

Accordingly, the present invention provides a heat shielding sheet capable of effectively diffusing heat generated from a light source to prevent deformation due to heat, and to prevent loss of light generated in the backlight unit system.

Another object of the present invention is to provide a manufacturing method of the heat radiation shielding sheet.

Still another object of the present invention is to provide a backlight unit including the heat radiation shielding sheet.

In order to achieve the above object, the present invention provides a semiconductor device comprising: a substrate layer; And a heat shielding layer coated on one surface of the substrate layer, wherein the heat shielding layer comprises a plastic resin and graphene or graphite.

According to another aspect of the present invention, there is provided a method for producing a resin composition, comprising: preparing a resin composition by dispersing graphene or graphite in a plastic resin; And coating the resin composition on a substrate layer to form a heat shielding layer.

According to another aspect of the present invention, there is provided a backlight unit including a heat shielding sheet, a light guide plate, a diffusion sheet, and a light collecting sheet, wherein the heat shielding sheet includes a base layer and a heat shielding layer disposed on the base layer , And the heat shielding layer comprises a plastic resin and graphene or graphite dispersed in the plastic resin.

The present invention provides a heat dissipation shielding sheet comprising plastic resin and graphene or graphite to increase energy efficiency of light generated from an LED light source of an edge type BLU, Can be improved. In addition, it is possible to solve the problem of a reduction in the image quality of the liquid crystal display due to the occurrence of sheet wrinkles and tears caused by the heat and uneven heat generated from the LED light source, and shortening the lifetime of the LED panel. Therefore, the BLU including the heat radiation shielding sheet has high energy efficiency, low optical characteristics, and excellent durability, so that the brightness, image quality, and life of the liquid crystal display using the BLU can be improved.

1 is a cross-sectional view of a heat shielding sheet according to an embodiment of the present invention.
2 is a cross-sectional view of a backlight unit according to an example of the present invention.
FIG. 3 is a photograph showing the leakage amount of light for Example 9, Comparative Example 4, and a control group (photograph of only a light source).

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described with reference to the drawings.

The present invention relates to a substrate layer; And a heat shielding layer coated on one surface of the substrate layer,

The heat shielding layer provides a heat shielding sheet comprising plastic resin and graphene or graphite.

1, the heat shielding sheet 100 according to an embodiment of the present invention may include a substrate layer 120 and a heat shielding layer 110 coated on one surface of the substrate layer, The shielding layer 110 may include a plastic resin, and a graphene or graphite 111.

Hereinafter, each configuration will be described in detail.

The substrate layer

The base layer may include a polyester resin, an acrylic resin, a polycarbonate resin, a polyolefin resin, an epoxy resin, a polyvinyl chloride resin, an acrylamide resin, or a mixed resin thereof.

Specifically, the base layer may include a polyethylene terephthalate resin, a polycarbonate resin, a polyethylene resin, a polypropylene resin, an epoxy resin, a polyethylene naphthalate resin, or a mixed resin thereof.

As an example, the base layer may be a white polyethylene terephthalate film.

The base layer may have a thickness ranging from 20 탆 to 350 탆, a range from 50 탆 to 350 탆, or a range from 100 탆 to 350 탆. When the thickness of the base layer is in the above preferable range, it is possible to easily make the backlight unit (BLU) slim without causing a problem of lowering of brightness due to its excellent light transmission efficiency.

Heat shielding layer

The heat shielding layer 110 may include plastic resin and graphene or graphite 111 and may include plastic resin and graphene in detail.

The plastic resin may be a thermosetting resin, a UV-curable resin, a moisture-curable resin, or a mixture thereof. Examples of the thermosetting resin include an epoxy resin, a phenol resin, a urethane resin, a polyester resin, and an amino resin. Examples of the UV curable resin include an acrylic resin and a vinyl resin. Examples of the moisture-curable resin include a one-component silicone resin and the like.

Specifically, the plastic resin may be selected from the group consisting of an acrylic resin, an acrylic copolymer resin, a vinyl copolymer resin, a phenol resin, an epoxy resin, an unsaturated polyester resin, an amino resin and a mixed resin thereof.

More specific examples of the plastic resin include (meth) acrylate resin, unsaturated polyester resin, polyester (meth) acrylate resin, silicone urethane (meth) acrylate resin, silicone polyester (meth) acrylate resin, fluorourethane (Meth) acrylate resins, phenol resins, epoxy resins, urea formaldehyde resins, melamine formaldehyde resins, and mixtures thereof.

As an example, the plastic resin may be an acrylic copolymer resin or a vinyl copolymer resin.

The heat shielding layer may include 10 to 600 parts by weight, specifically 100 to 500 parts by weight of the graphene or graphite, based on 100 parts by weight of the plastic resin. Since the graphene or graphite has a structural characteristic, that is, a crystalline graphite in which carbon atoms are recrystallized, not only the leakage light is shielded by improving the transmittance and brightness of the heat shielding sheet, but also heat resistance such as heat conductivity and thermal diffusivity, There is also advantageous in terms of side. In addition, the heat shielding layer exhibits anti-statistic characteristics by the graphene or graphite, thereby preventing blocking of external environmental contaminants in the BLU including the heat shielding layer, and further, And it is possible to prevent the static electricity in the BLU (electricity in which the charge stays and not flowing) and to improve the reliability and lifetime characteristics of the BLU.

The graphene or graphite may be in the form of spherical or non-spherical particles and may have a particle size of 5 nm to 100 탆, specifically 5 nm to 20 탆. The heat shielding layer may have a thickness of 1 탆 to 30 탆, specifically 1 탆 to 20 탆, more specifically 1 탆 to 15 탆. When the temperature is within the above range, the efficiency of thermal conductivity and thermal diffusivity in the plane direction can be improved, which is more advantageous in view of preventing leakage light.

The heat shielding layer may include a filler, a thermosetting agent, a UV curing agent, a curing accelerator, a coupling agent, an antioxidant, a surfactant, a radical initiator, a solvent and a mixture thereof.

The filler may be an organic polymer filler comprising a material selected from the group consisting of hard acrylate, polystyrene, nylon, soft acrylate and silicone. Of these, hard acrylate having good solvent resistance and easy dispersion is preferable. The filler is preferably spherical, and may have an average particle diameter of 0.5 탆 to 5 탆, preferably 0.8 탆 to 3 탆. The filler preferably has a refractive index different from the refractive index of the plastic resin by 0.02 or more. The filler may be used in an amount of 40 to 80 parts by weight, preferably 50 to 60 parts by weight, based on 100 parts by weight of the plastic resin constituting the heat shielding layer.

The thermosetting agent is not particularly limited as long as it can be used for thermosetting a thermosetting resin. Examples of the thermosetting agent include an amine type curing agent, an acid anhydride type curing agent, an imidazole type curing agent, a carboxylic acid type curing agent, an organic acid hydrazide type curing agent, A curing agent, a polyol curing agent, an oxazoline curing agent, a melamine curing agent, or a mixture thereof.

The UV curing agent is not particularly limited as long as it can be used for curing a UV curable resin, and examples thereof include triarylsulphonium hexafluoroantimonite, triarylsulphonium hexafluorophosphate and triarylsulphonium hexafluorophosphate. And a cationic photoinitiator such as a diaryliodonium salt.

The curing accelerator may be any one capable of performing the function of promoting the reaction between the thermosetting resin and the thermosetting agent. Examples of the curing accelerator include an imidazole-based curing accelerator, a phosphine-based curing accelerator, an ammonium-based curing accelerator, Accelerators, and mixtures thereof.

Examples of the coupling agent include a silane coupling agent, a titanate coupling agent, an aluminate coupling agent, and a silicone coupling agent. These couplers may be used singly or in combination.

Examples of the antioxidant include phenol-based, sulfur-based, and phosphorus-based antioxidants. The antioxidant may be used to improve the heat stability of the cured product by preventing oxidation deterioration during thermal curing of the thermosetting resin composition.

Wherein the surfactant is a length of the small number of the hydrocarbon group and -COONa, -OSO ₃ Na of anionic surfactants, cationic surfactants, non-ionic hydrophilic group as a compound having in a molecular surface active agent, an amphoteric surfactant, a sulfonic acid salt (sulphonates) in the molecule, Sulfates or sulfates, ethoxylates, etc. These surfactants can be used alone or in combination.

The radical initiator is a compound that generates a radical in the presence of a monomer, and examples thereof include an organic peroxide, a hydroperoxide, an alkyl compound, and an azo compound. These radical initiators may be used singly or in combination.

The solvent has compatibility with the above-mentioned polymer resin and does not react with the polymer resin, and any of known solvents used in the resin composition can be used. Examples of such a solvent include methyl ethyl ketone, methyl isobutyl ketone, toluene, xylene, butyl acetate or cyclohexanone. These solvents may be used alone or in combination of two or more.

The heat shielding sheet 100 may be a white polyester film, and the heat shielding layer may include 100 to 500 parts by weight of the graphene or graphite to 100 parts by weight of the plastic resin.

Furthermore, the heat shielding sheet 100 may further include a bead coating layer 130.

The bead coating layer 130 may include a plastic resin and thermally conductive particles dispersed in the plastic resin.

The thickness of the bead coating layer may be in a range of 100 nm to 10 mu m, more specifically, 1 mu m to 5 mu m. When the thickness of the bead coating layer is in the above preferable range, there is an advantage that the efficiency of the thermal conductivity in the plane direction is improved.

The plastic resin may be a thermosetting resin, a UV-curable resin, a moisture-curable resin, or a mixture thereof. Examples of the thermosetting resin include an epoxy resin, a phenol resin, a urethane resin, a polyester resin, and an amino resin. Examples of the UV curable resin include an acrylic resin and a vinyl resin. Examples of the moisture-curable resin include a one-component silicone resin and the like.

More specific examples of the plastic resin include (meth) acrylate resin, unsaturated polyester resin, polyester (meth) acrylate resin, silicone urethane (meth) acrylate resin, silicone polyester (meth) acrylate resin, fluorourethane (Meth) acrylate resins, phenol resins, epoxy resins, urea formaldehyde resins, melamine formaldehyde resins, and mixtures thereof. In detail, it is preferable to use a thermosetting resin which is a resin used in a general light-shielding diffusion sheet in terms of heat resistance, moisture resistance and UV resistance.

The thermally conductive particles may be metal particles, metal oxide particles, or carbon-based particles, and the carbon-based particles may be carbon isotope particles. Specifically, the thermally conductive particles may be aluminum (Al), copper (Cu), aluminum oxide (Al ₂ O ₃ ) or the like, and in detail, they may be metal oxide particles. Examples of the metal oxide particles include aluminum oxide (Al ₂ O ₃ ), magnesium oxide (MgO), potassium oxide (K ₂ O), beryllium oxide (BeO), or a combination thereof. Since the metal oxide particles are transparent and have a reflection characteristic by themselves, the reflectance and brightness of the heat radiation shielding sheet can be improved.

The thermally conductive particles may have a spherical or non-spherical shape.

The thermally conductive particles may be included in the bead coating layer in an amount of 200 to 500 parts by weight based on 100 parts by weight of the plastic resin. Specifically, the addition amount of the thermally conductive particles may be 350 to 400 parts by weight based on 100 parts by weight of the plastic resin. The thermally conductive particles may have a particle size in the range of 5 nm to 100 nm, specifically 10 nm to 50 nm. When the addition amount and the particle diameter of the thermally conductive particles are within the above range, there is an advantage that the efficiency of thermal conductivity and thermal diffusivity in the plane direction is improved.

Furthermore, the heat radiation shielding sheet including the thermally conductive particles may have a high reflectivity because the reflective function is improved due to the thermally conductive particles dispersed in the bead coating layer.

The bead coating layer may include a filler, a thermosetting agent, a UV curing agent, a curing accelerator, a coupling agent, a photoacid generator, an antioxidant, a surfactant, a radical initiator, a solvent or a mixture thereof, As shown above.

The heat radiation shielding sheet may have a thickness of 0.5 W / m · K to 1.0 W / m · K or more, 1.5 W / m · K or more, 0.5 W / m · K to 2.0 W / , 1.0 W / m · K to 2.0 W / m · K, or 1.5 W / m · K to 2.0 W / m · K. Further, the heat radiation-shielding sheet is 0.3 mm ² / s or more, 0.8 mm ² / s or more, 1.2 mm ² / s or more, 1.5 mm ² / s or more, 0.3mm ² / s to 2.0mm ² / s with respect to the surface direction , Thermal diffusivity of from 0.8 mm ² / s to 2.0 mm ² / s, from 1.2 mm ² / s to 2.0 mm ² / s, or from 1.5 mm ² / s to 2.0 mm ² / s See Example 2).

In addition, the heat shielding sheet may have a low transmittance by graphene or graphite, and may have a transmittance of 1% or less (see Test Example 3).

Furthermore, the heat radiation shielding sheet can have a luminance increase rate of 1% or more (see Test Example 1).

The present invention also provides a method for producing a resin composition, comprising: preparing a resin composition by dispersing graphene or graphite in a plastic resin; And coating the resin composition on a substrate layer to form a heat shielding layer.

Specifically, the production method of the present invention includes a step of dispersing graphene or graphite in a plastic resin to prepare a resin composition. The content, particle size, etc. of the graphene or graphite are as described above. When the graphene or graphite has the characteristics as described above, the dispersibility is improved, and a uniform resin composition can be produced. Specific examples of the plastic resin are as described above. As the dispersion method, a sol-gel method, a Stober method, a reverse phase microemulsion method, or the like can be used.

Thereafter, the manufacturing method of the present invention includes a step of coating the resin composition on the base layer to form a heat shielding layer. The specific composition and thickness range of the base layer are as described above. In detail, a white polyethylene terephthalate film can be used as the substrate layer. Such a white polyethylene terephthalate film can be produced by a conventional method. The specific thickness range of the coating is as exemplified above. The coating may be performed by wet coating.

In addition, the manufacturing method of the present invention may further include forming a bead coating layer by coating a resin composition prepared by dispersing thermally conductive particles in a plastic resin. A detailed description of the thickness range of the plastic resin composition, the thermally conductive particles, the bead coating layer, and the dispersing method is as described above.

As an example, according to the manufacturing method, the heat radiation shielding sheet may have a base layer and a heat shielding layer on one surface of the base layer.

As another example, according to the above manufacturing method, the heat radiation shielding sheet may have a base layer, a heat shielding layer on one surface of the base layer, and a bead coating layer on the other surface of the base layer.

The present invention also provides a backlight unit including a heat shielding sheet, a light guide plate, a light collecting sheet, and a diffusion sheet, wherein the heat shielding sheet includes a base layer and a heat shielding layer disposed on the base layer, And a backlight unit comprising the plastic resin and graphene or graphite dispersed in the plastic resin.

2, the backlight unit 200 includes a light guide plate 230, an LED light source 210 disposed adjacent to the light guide plate 230, and a heat shielding sheet (not shown) disposed on one surface of the light guide plate 230 220). The backlight unit 200 may further include a diffusion sheet 260 and / or a light collecting sheet (prism sheet) 240, 250 for improving optical characteristics. At this time, the heat radiation shielding sheet 220 has the same configuration and characteristics as the heat radiation shielding sheet described above. The light source 210 may be disposed adjacent to an edge of the light guide plate 230. That is, the backlight unit 200 may be an edge dimming type backlight unit.

The backlight unit according to the present invention can be improved in optical characteristics and durability without deformation of the heat shielding sheet even when the thickness of the backlight unit is reduced and the temperature of the light source is increased.

As described above, the present invention provides a heat dissipation shielding sheet comprising plastic resin and graphene or graphite, thereby increasing the energy efficiency of light generated from the LED light source of the edge type BLU, It is possible to improve the luminance of the display. In addition, it is possible to solve the problem of a reduction in the image quality of the liquid crystal display due to the occurrence of sheet wrinkles and tears caused by the heat and uneven heat generated from the LED light source, and shortening the lifetime of the LED panel. Therefore, the BLU including the heat radiation shielding sheet has high energy efficiency, low optical characteristics, and excellent durability, so that the brightness, image quality, and life of the liquid crystal display using the BLU can be improved.

Hereinafter, the present invention will be described in more detail by way of specific examples and comparative examples. The following examples are intended to further illustrate the present invention and are not intended to limit the scope of the present invention.

Example  One

100 parts by weight of vinyl copolymer resin (Aekyung Chemical Co., Ltd., acrylic copolymer, AOF-2018S) containing methacrylic ester as a main component, 100 parts by weight of graphene paste (XG SCIENCES) in the form of dispersion ink paste, And 200 parts by weight of a mixed solvent (XGi94C, XG SCIENCES, Inc) were mixed to prepare a resin composition. The above resin composition was applied to a white polyethylene terephthalate film (SY100, SKC Co., Ltd.) having a thickness of 188 탆 as a base layer by a wet coating method to form a coating layer having a thickness of 5 탆, and then dried using a dryer at 80 캜 for 120 seconds And then cured to prepare a heat shielding sheet.

Example  2 to 12, and Comparative Example  1 to 4

A heat radiation shielding sheet was prepared in the same manner as in Example 1, except that the content of graphene, the thickness of the shielding layer, and / or the metal oxide instead of graphene were changed as shown in Table 1 below . Here, in Comparative Example 4, a white polyethylene terephthalate film (SY100, SKC Co., Ltd.) having a thickness of 188 탆 was used.

Test Example  1: luminance

Each of the heat shielding sheets manufactured in Examples 1 to 12 and Comparative Examples 1 to 4 was applied to a backlight unit composed of an Edge LED V1 bar BLU lamp and a light guide plate of an edge dimming method. After the lamp was turned on, the brightness of each heat shielding sheet was measured using CS-2000 (Spectroradiometer) manufactured by KONICA MINOLTA. In the case of luminance, the luminance of the sheet of Comparative Example 1 was calculated as a relative luminance with reference (100%). The results are shown in Table 1 below.

Test Example  2: Thermal conductivity and Thermal diffusivity

Thermal conductivity and thermal diffusivity of each of the heat shielding sheets prepared in Examples 1 to 12 and Comparative Examples 1 to 4 under the same conditions as in Test Example 1 were measured using a guarded hot plate method. The results are shown in Table 1 below.

Test Example  3: transmittance

Each of the heat shielding sheets prepared in Examples 1 to 12 and Comparative Examples 1 to 4 under the same conditions as in Test Example 1 was measured for its transmittance using NDH-2000 Haze Meter (NIPPON DENSHOKU). The results are shown in Table 1 below.

Test Example   4: Leakage capacity

When an LED point light source lamp as a light source was placed at a distance of 100 mm from the back surface of the shielding heat-radiating sheet manufactured in Example 9 and Comparative Example 4 and the light source was viewed through the shielding heat-radiating sheet, (Light shielding performance) was evaluated. At this time, the case where only the light source was photographed without the shielding heat-radiating sheet was compared with the above-mentioned Examples and Comparative Examples as a control group. The results are shown in FIG. 3 as photographs.

division Grapina Metal oxide
(Al ₂ O ₃₎ Shielding layer thickness (탆) Transmittance
(%) Luminance
(%) Leakage light
The presence or absence Thermal conductivity
(W / mK) Thermal diffusivity
(mm ² / s) Example 1 100 0 5 0.93 101.3 Poet × 1.60 1.54 Example 2 100 0 10 0.66 102.0 Poet × 1.61 1.55 Example 3 100 0 15 0.51 102.4 Poet × 1.63 1.58 Example 4 200 0 5 0.92 101.4 Poet × 1.64 1.59 Example 5 200 0 10 0.54 102.2 Poet × 1.65 1.60 Example 6 200 0 15 0.35 102.8 Poet × 1.70 1.66 Example 7 400 0 5 0.89 101.6 Poet × 1.66 1.61 Example 8 400 0 10 0.50 102.5 Poet × 1.68 1.62 Example 9 400 0 15 0.19 103.2 Poet × 1.78 1.72 Example 10 500 0 5 0.84 101.7 Poet × 1.66 1.61 Example 11 500 0 10 0.63 102.1 Poet × 1.68 1.62 Example 12 500 0 15 0.36 102.7 Poet × 1.72 1.67 Comparative Example 1 0 400 5 2.31 100.0 Poet ○ 0.80 0.77 Comparative Example 2 0 400 10 2.27 100.0 Poet ○ 0.79 0.76 Comparative Example 3 0 400 15 2.24 100.1 Poet ○ 0.79 0.76 Comparative Example 4 0 0 - 2.40 100.0 Poet ○ 0.29 0.24

Referring to Table 1 and FIG. 3, it can be seen that the heat shielding sheets of Examples 1 to 12 according to the present invention have improved optical characteristics such as transmittance, luminance, thermal conductivity, and thermal diffusivity compared to the sheets of Comparative Examples 1 to 4 . In addition, it was confirmed that the sheets of the comparative example leaked light of the light source, but the heat shielding sheet of the example is excellent in the light shielding performance because there is no leaked light

100: heat shielding sheet
110: Heat shielding layer
111: graphene or graphite
120: substrate layer
130: bead coating layer
200: Backlight unit (BLU)
210: LED light source
220: Heat shielding sheet
230: Light guide plate (LGP)
240, 250: condensing sheet
260: diffusion sheet

Claims (10)

A base layer; And
And a heat shielding layer coated on one surface of the substrate layer,
Wherein the heat shielding layer comprises a plastic resin and graphene,
And a thermosetting particle containing a thermoplastic particle dispersed in the plastic resin on the other surface of the substrate layer, wherein the thermosetting particle is a metal particle, a metal oxide particle, a carbon particle, Sheet.
The method according to claim 1,
Wherein the heat shielding layer comprises 100 to 500 parts by weight of the graphene based on 100 parts by weight of the plastic resin.
3. The method of claim 2,
Wherein the heat radiation shielding layer has a thickness of 1 占 퐉 to 20 占 퐉.
The method according to claim 1,
Wherein the plastic resin is selected from the group consisting of an acrylic resin, an acrylic copolymer resin, a vinyl copolymer resin, a phenol resin, an epoxy resin, an unsaturated polyester resin, an amino resin and a mixed resin thereof.
The method according to claim 1,
Wherein the base layer is a white polyester film and the heat radiation shielding layer comprises 100 to 500 parts by weight of the graphene based on 100 parts by weight of the plastic resin.
6. The method of claim 5,
The heat radiation shielding sheet is 0.5W / m · K to about 2.0 W / m · K of thermal conductivity and 0.3mm ² / s to about 2.0mm, heat radiation-shielding sheet having a thermal diffusivity of ² / s with respect to the surface direction.
The method according to claim 6,
Wherein the heat radiation shielding sheet has a transmittance of 1% or less.
The method according to claim 6,
Wherein the heat radiation shielding sheet has a luminance increase rate of 1% or more.
Dispersing graphene in a plastic resin to produce a resin composition; And
Coating the resin composition on one surface of the substrate layer to form a heat shielding layer; And
And forming a bead coating layer on the other surface of the base layer, the bead coating layer including a plastic resin and thermally conductive particles dispersed in the plastic resin.
A backlight unit including a heat dissipation shielding sheet, a light guide plate, a light condensing sheet, and a diffusion sheet,
Wherein the heat shielding sheet comprises a substrate layer and a heat shielding layer disposed on the substrate layer,
Wherein the heat shielding layer comprises a plastic resin and graphene dispersed in the plastic resin,
And a bead coating layer on the other surface of the substrate layer, the bead coating layer including a plastic resin and thermally conductive particles dispersed in the plastic resin, wherein the thermally conductive particles are metal particles, metal oxide particles, carbon particles, .

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