KR102359778B1 - Plastic injection molding body with a heat dissipation property and an electromagnetic wave shielding property - Google Patents

Abstract

A plastic injection molded article is provided. A plastic injection molded article according to an exemplary embodiment of the present invention includes: a graphite substrate including a matrix and a graphite-nanometal composite dispersed on the matrix and having nanometal particles bonded to the surface of the graphite; a reinforcing support made of a metal material and embedded in the graphite substrate; and at least one fastening hole formed in the graphite base for fastening with other parts, wherein the graphite base and the reinforcing support are integrally formed through insert molding, and the fastening hole is a portion directly above the reinforcing support It is formed so as to penetrate the reinforcing support embedded in the graphite substrate while positioned in the.

Description

Plastic injection molding body with a heat dissipation property and an electromagnetic wave shielding property

The present invention relates to a plastic injection molded article having heat dissipation properties and electromagnetic wave shielding properties.

Nanocomposite materials are materials that are hybridized at the nano level by physical or chemical methods in order to overcome the limitations of physical properties of a single material or a simple combination of different materials and to derive multifunctional and high-performance synergistic effects.

These polymer nanocomposite materials are attracting attention as new materials that are expected to be applied in fields requiring high-functionality composite materials, such as the automobile industry, the electronics industry, and the energy industry. Currently, research to develop high-functional polymer nanocomposite materials by filling polymer resins with carbon-based fillers such as carbon nanotubes, carbon fibers, and graphene is being actively conducted, of which the most attention is currently being paid. The filler being received is sheet graphite

Carbon nanostructures such as sheet graphite have a large surface area compared to other conventional nano-additives (Na-MMT, LDH, CNT, CNF, EG, etc.), and have excellent mechanical strength, thermal and electrical properties, flexibility and transparency. have the advantage of having Therefore, research to develop a high-performance functional polymer composite material with excellent conductivity and mechanical strength by filling sheet graphite with a polymer resin is being actively conducted.

However, because carbon nanostructures such as plate graphite have a very stable chemical structure with each other's vander Walls force, it is difficult to uniformly disperse them in polymer resins and organic solvents. is difficult to manufacture. Accordingly, although the carbon nanostructure itself has excellent physical properties, research for practical application has been very limited.

In order to solve this problem, research on a method of modifying the surface of carbon nanostructures to form a uniform dispersed phase in an organic solvent is being actively conducted.

In order to uniformly disperse the carbon nanostructures and increase the mutual affinity with the polymer, a separate pretreatment process is essential on the surface of the carbon nanostructures. Thus, a functional group was introduced into the carbon nanostructure, but this wet acid treatment method had disadvantages in that the yield of the treated carbon nanostructure was low and not environmentally friendly.

In addition, there is a method of introducing a functional group to the surface after exposure to a gas under vacuum using plasma deposition, but this method has difficulties in the storage method of carbon nanostructures. This is because, since it is already in a chemically etched state, the aging of the treated carbon nanostructures can be accelerated, and thus the physical properties of the carbon nanostructures can be reduced.

On the other hand, the electronic control unit (Electronic Control Unit: hereinafter referred to as 'ECU') generally used in a vehicle includes various sensors, for example, an oxygen sensor, an air flow sensor, a water temperature sensor, a crank angle sensor, a motor position sensor, and atmospheric pressure. It receives signals from sensors and the like to electronically control the driving of each part of the vehicle. However, when the electronic control unit is driven, high heat and electromagnetic waves are generated from circuit elements mounted therein, for example, a field effect transistor (Field Effect Transistor). development is urgently needed.

In order to solve this problem, recently, a molding material for heat dissipation and electromagnetic wave shielding manufactured by heating and melting aluminum, copper, and its alloy material to a high temperature state, and then extrusion molding using a mold having a certain shape, is used. In the case of aluminum, copper, or an alloy material thereof, there is a problem in that the thermal diffusion index is low, so that the heat dissipation performance to the outside such as air is significantly lowered, making it difficult to express the desired level of heat dissipation performance.

In addition, since it is difficult to exhibit an electromagnetic wave shielding effect in the case of aluminum, copper, and alloy materials thereof, a separate electromagnetic wave shielding member must be included in the device, so it is difficult to reduce the size or thickness of the device.

KR 10-0744271 B1

The present invention has been devised in view of the above points, and by manufacturing an injection molded body using a graphite substrate including a graphite-nano-metal composite, it is light and has a low production cost, excellent heat dissipation and electromagnetic wave shielding effect. An object of the present invention is to provide a plastic injection molded article having a shielding property.

In addition, the present invention provides a plastic injection having heat dissipation and electromagnetic wave shielding properties that can improve the breakage problem due to brittleness by embedding a reinforcing support inside a graphite substrate including a graphite-nanometal composite and manufacturing an injection molded body through insert molding. Another object is to provide a molded body.

In order to solve the above problems, the present invention provides a graphite substrate comprising a matrix and a graphite-nanometal composite dispersed on the matrix and having nanometal particles bonded to the surface of the graphite; a reinforcing support made of a metal material and embedded in the graphite substrate; and at least one fastening hole formed in the graphite base for fastening with other parts, wherein the graphite base and the reinforcing support are integrally formed through insert molding, and the fastening hole is a portion directly above the reinforcing support It provides a plastic injection molded body having heat dissipation properties and electromagnetic wave shielding properties that are formed to penetrate the reinforcing support embedded in the graphite substrate while being positioned in the graphite substrate.

In addition, the reinforcing support may include any one of magnesium or aluminum.

In addition, the reinforcing support may include a circular or polygonal rim member and a connecting member having both ends connected to the rim member.

In addition, the connecting member may have any one shape among a lattice shape, a honeycomb shape, a straight shape, a curved shape, and a combination thereof.

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In addition, the nano-metal particles may be crystallized nanoparticles.

In addition, the graphite-nanometal composite may further include a polydopamine layer coated on the nanometal particles, and the polydopamine layer may have a thickness of 5 to 1000 nm.

In addition, the graphite-nanometal composite may be included in an amount of 50 to 80% by weight in the graphite substrate.

In addition, the housing may include a protective coating layer formed on the outer surface, and the protective coating layer is made of a composition for forming a protective coating layer including a polymer resin to protect the graphite substrate and may have environmental resistance and insulation properties.

In this case, the polymer resin is at least one selected from the group consisting of epoxy-based, polyethylene-based, polypropylene-based, polystyrene-based, polyvinyl chloride-based, nylon-based, silicone-based, phenol-based, polyester-based, polyimide-based, and polyurethane-based resins. resin may be included.

In addition, the composition for forming the protective coating layer may include an epoxy resin and a carbon-based filler in order to improve thermal diffusion to the outside. In this case, the carbon-based filler is selected from the group consisting of single-walled carbon nanotubes, double-walled carbon nanotubes, multi-walled carbon nanotubes, graphene, graphene oxide, graphene nanoplates, graphite, carbon black, and carbon-metal composites. It may include one or more of the

According to the present invention, it is possible to obtain a light, low production cost, excellent heat dissipation and electromagnetic wave shielding effect by manufacturing an injection molded article using a graphite substrate including a graphite-nanometal composite.

In addition, by embedding a reinforcing support inside the graphite substrate including the graphite-nanometal composite to manufacture an injection molded body through insert molding, it is possible to improve the problem of breakage due to brittleness and increase the fastening property with other parts.

Furthermore, the present invention can improve durability, environmental resistance and heat dissipation by forming a protective coating layer on the outer surface of the graphite substrate.

1 is a view showing a plastic injection molded article having heat dissipation and electromagnetic wave shielding properties according to the present invention;
2 is a partially cut-away view showing a state in which other parts are fastened in FIG. 1;
3 is a cross-sectional view in the AA direction in FIG. 2, and,
4 is an exemplary view showing various shapes of the reinforcing support applied to the plastic injection molded article having heat dissipation and electromagnetic wave shielding according to the present invention.

Hereinafter, with reference to the accompanying drawings, embodiments of the present invention will be described in detail so that those of ordinary skill in the art can easily carry out the present invention. The present invention may be embodied in many different forms and is not limited to the embodiments described herein. In order to clearly explain the present invention in the drawings, parts irrelevant to the description are omitted, and the same reference numerals are added to the same or similar elements throughout the specification.

The plastic injection molded body 100 (hereinafter referred to as 'plastic injection molded body') having heat dissipation and electromagnetic wave shielding properties according to the present invention is a graphite substrate 110 and a reinforcing support 120 as shown in FIGS. 1 and 2 . include

At this time, the graphite substrate 110 is dispersed on the matrix 111 and the matrix 111 so as to simultaneously express excellent heat dissipation and electromagnetic wave shielding performance as shown in FIG. 3 , and nano-metal particles are formed on the surface of the graphite. It is formed by injection molding the substrate-forming composition including the bonded graphite-nanometal composite 112 .

Preferably, the plastic injection-molded body 100 is injection-molded through insert molding so that the reinforcing support 120 can be integrally formed while being embedded in the graphite substrate 110 .

That is, the plastic injection molded body 100 according to the present invention contains graphite with good heat dissipation in the graphite substrate 110 itself, so that a separate heat dissipation structure for dissipating heat generated from the heat source is unnecessary, so it can be implemented with a simple design. do.

To this end, the matrix 111 for forming the graphite substrate 110 may be a polymer resin. The polymer resin may include at least one of a thermosetting resin and a thermoplastic resin.

Here, the thermosetting resin may include at least one selected from the group consisting of an epoxy-based resin, a urethane-based resin, a melamine-based resin, and a polyimide-based resin, and the thermoplastic resin is a polycarbonate-based resin, a polystyrene-based resin, a poly selected from the group consisting of sulfone-based resins, polyvinyl chloride-based resins, polyether-based resins, polyacrylate-based resins, polyester-based resins, polyamide-based resins, cellulose-based resins, polyolefin-based resins, and polypropylene-based resins It may include one or more types.

On the other hand, when the graphite-nanometal composite 112 forming the graphite substrate 110 together with the matrix 111 is a composite in which nanometal particles are bonded to the surface of graphite, a specific bonding method, graphite and nanometal particles It can be selected and used regardless of the content or the type of nano metal particles.

However, preferably, the nano-metal particles may be a conductive metal to exhibit an electromagnetic wave shielding effect. For example, the nanometal particles may include at least one selected from the group consisting of Ni, Si, Ti, Cr, Mn, Fe, Co, Cu, Sn, In, Pt, Au, and Mg.

Meanwhile, the graphite-nanometal composite 112 included in the graphite substrate 110 may be manufactured by various methods.

As an example, graphite and nanometal particles are mixed to prepare a graphite-nanometal particle mixture. At this time, the mixing ratio of the nano-metal particles and the plate graphite can be arbitrarily set according to the purpose of use, but in the present invention, the nano-metal particles are present at a high density on the surface of the plate-shaped graphite, preferably 20 to 50 wt% based on the total weight. It can be mixed to contain.

Then, plasma is applied to the graphite-nanometal particle mixture to vaporize the nanometal particles. Thereafter, a quenching gas is injected into the vaporized nano-metal particles to condense or quench the vaporized nano-metal particles. Accordingly, the growth of the vaporized nanometal particles is suppressed, and the nanometal particles are crystallized on the graphite surface to form the graphite-nanometal particle composite 112 .

In the graphite-nanometal particle composite, the nanometal particles may be included in an amount of 20 to 50 wt% with respect to the graphite, and may be bonded to the graphite surface in the form of crystals having an average particle diameter of 10 to 200 nm. In addition, it may have a surface area range of 30 to 70 area% with respect to the cross section of the graphite-nanometal particle composite.

Meanwhile, the graphite-nanometal particle composite 112 may include a polydopamine layer on the nanometal particle. The polydopamine layer may be formed by dipping the graphite-nanometal particle composite 112 in an aqueous dopamine solution. At this time, when a basic aqueous dopamine solution is used as the dopamine aqueous solution, dopamine reacts spontaneously under oxidizing conditions, thereby polymerizing on the nanometal particles of the graphite-nanometal particle complex 112 to form a polydopamine layer. Therefore, a separate firing process is not required, and the addition of the oxidizing agent is not particularly limited, but oxygen gas in the air may be used as the oxidizing agent without the addition of the oxidizing agent.

Here, the thickness of the polydopamine layer is determined by the dipping time. Accordingly, when using an aqueous dopamine solution prepared by dissolving dopamine so that the dopamine concentration is 0.1 to 5 mg/mL in a tris buffer solution having a pH of 8 to 14, a polydopamine layer having a thickness of 5 to 100 nm is formed in about 0.5 to It is preferable to dip the nanometal-platelet graphite for 24 hours.

On the other hand, even if the graphite is simply dipped in the dopamine aqueous solution, the dopamine coating layer is not formed on the surface of the graphite, but when the nano-metal particles are bonded to the graphite surface, the dopamine coating layer is formed by the nano-metal particles.

Accordingly, in the present invention, since the graphite-nanometal particle composite 112 constituting the graphite substrate 110 in the present invention is in a state in which the nanometal particles are bonded to the surface of the graphite, a polydopamine layer is formed by the nanometal particles.

The polydopamine layer improves the interfacial properties between the above-described matrix-forming component and the graphite-nanometal composite, thereby enabling the formation of the graphite substrate 110 in the form of a sheet even if a small amount of the matrix-forming component is included.

Accordingly, the content of the graphite-nanometal composite 112 in the graphite substrate 110 may be increased. In addition, when the polydopamine layer is coated on the graphite-nanometal composite 112, dispersibility is improved in an organic solvent, so that when the composition for forming the substrate includes an organic solvent, the graphite-nanometal complex in the composition for forming the substrate can be uniformly distributed.

On the other hand, the base-forming composition is also a leveling agent, a pH adjuster, an ion scavenger, a viscosity modifier, a thixotropic agent, an antioxidant, a heat stabilizer, a light stabilizer, an ultraviolet absorber, a colorant, a dehydrating agent, a flame retardant, an electrification agent One type or two or more types of various additives, such as an inhibitor, an antifungal agent, and an antiseptic|preservative, may be added. As the various additives described above, those known in the art may be used, and thus, the present invention is not particularly limited.

In addition, the forming component of the polydopamine layer may further include a solvent. A solvent suitable for this can be selected according to the selected adhesive component, and the present invention is not particularly limited thereto. As the solvent, any solvent that enables appropriate dissolution of each component can be used, for example, water, etc. At least one selected from the group consisting of an aqueous solvent, an alcohol-based solvent, a ketone-based solvent, an amine-based solvent, an ester-based solvent, an amide-based solvent, a halogenated hydrocarbon-based solvent, an ether-based solvent, and a furan-based solvent may be used.

The base-forming composition may be made of the graphite base 110 in the process of being integrally formed with the reinforcing support 120 through insert molding.

In addition, when the polydopamine layer is formed on the nanometal particles constituting the graphite-nanometal composite 112, the graphite-nanometal composite 112 is included in 50 to 80% by weight in the graphite substrate 110. can

As described above, the plastic injection molded body 100 according to the present invention can implement excellent heat dissipation by using the graphite substrate 110 containing 50 to 80 wt% of the graphite-nanometal composite 112 as a material.

On the other hand, the plastic injection molded body 100 according to the present invention includes a reinforcing support 120 made of a metal material to reinforce the strength of the graphite substrate 110 . The reinforcing support 120 is integrally formed with the graphite substrate 110 by being embedded in the graphite substrate 110 through insert molding.

That is, since the graphite substrate 110 according to the present invention is made of a polymer resin and a graphite-nano-metal composite 112, the material has strong brittleness and thus may be vulnerable to external impact.

In order to solve this problem, in the present invention, the reinforcing support 120 made of a metal material having rigidity is embedded in the graphite substrate 110 .

Through this, it is possible to prevent easy damage by enhancing the resistance to external impact and reinforcing the strength through the reinforcing support 120 .

Such a reinforcing support 120 is Al, Ni, Si, Ti, Cr, Mn, Fe, Co, Cu, Sn, In, Pt, Au to enhance the electromagnetic wave shielding effect while reinforcing the strength against external impact. , and may be made of a metal material comprising at least one selected from the group consisting of Mg.

Preferably, in consideration of material cost, it may be made of Al or Ma material. However, the present invention is not limited thereto and may be made of various known metal materials.

On the other hand, the reinforcing support 120 may be in the form of a plurality of wires spaced apart from each other, a bar type, a plate having a predetermined width, etc. .

In addition, the reinforcing support 120 may be configured to include a circular or polygonal rim member 121 and a connecting member 122 whose zero end is connected to the rim member 121 .

That is, as shown in FIG. 4 , in the reinforcement support 120 , a plurality of connecting members 122 may be arranged in a lattice structure or a honeycomb structure on the inside of the substantially rectangular edge member 121 ( a) and 4(c)), a plurality of connecting members 122 may be disposed parallel to each other and spaced apart from each other on the inside of the edge member 121 (see FIG. 4(b)), and one side of the curved surface The approximately rhombus-shaped connecting members 122 formed by ? may be interconnected (refer to (d) of FIG. 4).

However, the shape of the reinforcing support 120 is not limited thereto, and the connecting member 122 may have any one of a lattice shape, a honeycomb shape, a linear shape, a curved shape, a circular shape, a polygonal shape, and a combination thereof. It should be noted that it may be composed of only the connecting member 122 without the rim member 121 .

On the other hand, in the plastic injection molded body 100 according to the present invention, at least one fastening hole 140 may be provided at various positions in order to improve fastening properties with other parts.

Such a fastening hole 140 may be formed to be recessed or penetrated to a predetermined depth from one surface of the graphite substrate 110 through post-processing.

Through this, when the plastic injection molded body 100 according to the present invention is implemented in a predetermined shape, it is necessary to firmly fasten it with other parts or when assembling with another plastic injection molded body 100 is required to form a predetermined case. By inserting a known fastening member 20 , such as a member or a pin member, into the fastening hole 140 , it can be securely fastened to the other parts or other plastic injection molded body 100 .

At this time, the fastening hole 140 minimizes damage to the graphite base 110 and at the same time prevents the graphite base 110 from being damaged from the load concentrated on the fastening portion when fastening through the fastening member 20 . It is formed so as to be positioned directly above the reinforcing support 120 .

That is, the fastening hole 140 is formed so as to penetrate the reinforcing support 120 embedded in the graphite base 110 from one surface of the graphite base 110 so that a load generated during fastening is applied to the reinforcing support 120 . to be supported by

Accordingly, even if a load is generated toward the fastening member 20 to maintain the coupled state in a state coupled to other parts through the fastening member 20 , the load is applied to the reinforcement support through the fastening member 20 . By being transferred to the (120) side, the fastening force is increased and the graphite substrate 110 itself is prevented from being damaged by the load.

In addition, by minimizing the area processed on the graphite substrate 110 itself to form the fastening hole 140 , the risk that the graphite substrate 110 itself may be damaged during processing can be reduced.

Through this, the plastic injection molded body 100 according to the present invention can overcome the limitations of the conventional injection molded product with a high risk of damage to the fastening part due to the concentrated load when assembling with other parts through the fastening member. assembly is possible.

Here, the fastening hole 140 may be formed in various positions and in an appropriate number of the plastic injection molded body 100, and is located directly above the reinforcing support 120, but the end of the fastening member is the reinforcing support ( 120) as long as it is interconnected with any other form.

On the other hand, the plastic injection molded body 100 according to the present invention may include a protective coating layer 130 made of a composition for forming a protective coating layer including a polymer resin on the outer surface as shown in FIG. 3 .

That is, in the plastic injection molded body 100 according to the present invention, the protective coating layer 130 is applied to the surface of the graphite substrate 110 to a predetermined thickness, thereby protecting the graphite substrate 110 from the external environment and the Through the components included in the composition for forming a protective coating layer, it is possible to implement additional performance such as insulation, electromagnetic wave shielding properties and earthquake resistance.

At this time, the thickness of the protective coating layer 130 may be 0.1 ~ 1000㎛ . This is, when the thickness of the protective coating layer is less than 0.1 μm, the graphite included in the graphite substrate 110 is more likely to be separated from the nano-metal composite 112, and the thickness of the protective coating layer 130 exceeds 1000 μm. This is because there is a disadvantage that thinning is difficult in this case.

As the composition for forming the protective coating layer, any coating layer-forming component known in the art may be used.

For example, the composition for forming the protective coating layer may include a polymer resin, and the polymer resin may include at least one of a thermosetting resin and a thermoplastic resin. The thermosetting resin may include at least one selected from the group consisting of an epoxy-based resin, a silicone resin, a urethane-based resin, a melamine-based resin, a phenol resin, and a polyimide-based resin, and the thermoplastic resin is a polycarbonate-based resin, polystyrene resins, polysulfone-based resins, polyvinyl chloride-based resins, polyether-based resins, polyacrylate-based resins, polyester-based resins, polyamide-based resins, cellulose-based resins, polyolefin-based resins and polypropylene-based resins. It may include one or more selected from the group consisting of.

That is, the composition for forming the protective coating layer may include various polymer resins depending on the purpose of use. For example, when it is desired to implement insulation through the protective coating layer 130, a silicone resin, an epoxy resin, a polyester resin, etc. may be included, and when it is intended to improve the earthquake resistance, a phenol resin or an epoxy resin may be included. In addition, in the case of increasing heat dissipation, a carbon-based filler may be included in the epoxy resin.

However, when a carbon-based filler is included in order to add heat dissipation to the protective coating layer 130, very excellent adhesion performance is expressed between the graphite substrate 110 and the carbon-based filler and the protective coating layer forming component and compatibility with the carbon-based filler The protective coating layer forming component may include an epoxy resin, and a curing agent for curing the epoxy resin may be included in the protective coating layer forming component so as to simultaneously achieve improvement in heat dissipation performance according to the improvement. The epoxy resin is not particularly limited in a specific kind because it can use an epoxy resin known in the art, and may be selected differently depending on the purpose.

Here, the epoxy resin is a glycidyl ether type epoxy resin, a glycidylamine type epoxy resin, a glycidyl ester type epoxy resin, a linear aliphatic type epoxy resin, a cycloaliphatic type epoxy resin, It may include at least one selected from the group consisting of a cyclic-containing epoxy resin, a substituted epoxy resin, a naphthalene-based epoxy resin, and derivatives thereof.

In addition, the type of the curing agent included in the protective coating layer forming component together with the epoxy resin may vary according to the specific type of the selected epoxy resin, and the specific type may use a curing agent known in the art, preferably It may include any one or more of polyhydric hydroxy compounds, aliphatic amines, aromatic amines, acid anhydrides, and latent curing agents.

Here, among the curing agents for epoxy resins, a heat curing type curing agent that is liquid at room temperature or a latent curing agent such as dicyandiamide which is polyfunctional and may be added in a small amount equivalently may be used as the curing agent.

On the other hand, the protective coating layer forming component may further include a curing accelerator in addition to the above-described epoxy resin and curing agent. The curing accelerator serves to adjust the curing speed or physical properties of the cured product, and a known curing accelerator may be selected and used according to the type of the selected curing agent, and non-limiting examples thereof include amines, imida It may be sols, organic phosphines, or Lewis acid curing accelerators. An example of the use of the curing accelerator is when an amine-based curing agent is used, for example, a curing accelerator such as an imidazole-based curing accelerator may be used in combination. , the present invention is not limited to this use case.

In addition, the protective coating layer forming component is a leveling agent, a pH adjusting agent, an ion trapping agent, a viscosity adjusting agent, a thixotropic agent, an antioxidant, a heat stabilizer, a light stabilizer, an ultraviolet absorber, a colorant, a dehydrating agent, a flame retardant, One or more kinds of various additives such as antistatic agent, anti-mold agent (防黴劑), preservative and the like may be added. As the various additives described above, those known in the art may be used, and thus, the present invention is not particularly limited.

In addition, the protective coating layer forming component may further include a solvent. Here, the solvent may be a suitable solvent according to the selected adhesive component, and as the solvent, any solvent that enables proper dissolution of each component may be used, for example, an aqueous solvent such as water, alcohol At least one selected from the group consisting of a solvent-based solvent, a ketone-based solvent, an amine-based solvent, an ester-based solvent, an amide-based solvent, a halogenated hydrocarbon-based solvent, an ether-based solvent, and a furan-based solvent may be used.

On the other hand, in order to smoothly radiate heat radiated from the graphite substrate 110 through the protective coating layer 130 by adding heat dissipation to the protective coating layer 130 , a carbon-based filler is included in the protective coating layer forming component. The carbon-based filler may be used without limitation when it contains carbon in its material, and a carbon-based material known in the art may be used.

Here, since the carbon-based filler includes carbon in the same manner as the graphite substrate, the interfacial properties of the graphite substrate and the protective coating layer can be improved. In addition, the shape and size of the carbon-based filler is not limited, and may be porous or non-porous in structure, and may be selected differently depending on the purpose. However, preferably, in order to express excellent heat dissipation performance, the carbon-based filler is single-walled carbon nanotube, double-walled carbon nanotube, multi-walled carbon nanotube, graphene, graphene oxide, graphene nanoplate, graphite, carbon black And it may include one or more from the group consisting of a carbon-metal composite, and more preferably, carbon black may be included as a main material of the carbon-based filler.

In addition, the protective coating layer 130 may include a physical property enhancing component in the composition for forming the protective coating layer.

The physical property enhancing component is to improve durability by expressing further improved heat dissipation and excellent adhesion when the composition for forming a protective coating layer is coated on the graphite substrate 110 .

When used together with the epoxy resin among the above-mentioned protective coating layer forming components and carbon black among the carbon-based fillers, these physical properties enhancing components cause a synergistic effect on the desired physical properties to express remarkable durability and heat dissipation, thereby modifying or coating the surface of a conventional graphite substrate. It enables improvement of physical properties that cannot be achieved by any other method of can

As an example, the physical property enhancing component may include a silane-based compound. The silane-based compound may be used without limitation in the case of a compound commonly used as a silane coupling agent in the art, and non-limiting examples thereof include an amino silane coupling agent, an epoxy silane coupling agent, a ureido silane coupling agent, and an isocyanate silane coupling agent. , a vinyl silane coupling agent, an acryl silane coupling agent, a ketimine silane coupling agent, etc. are mentioned, These silane coupling agents can be used individually or in combination of 2 or more types. In addition, the silane-based compound may further include a titanium coupling agent, an aluminum coupling agent, and the like.

In addition, the physical property enhancing component may further include a dispersing agent in the silane-based compound. Here, the dispersant may be used without limitation, those known in the art. However, the dispersant is a polyester-based dispersant, a polyphenylene ether-based dispersant, a polyolefin-based dispersant, an acrylonitrile-butadiene-styrene copolymer dispersant, a polyarylate-based dispersant, a polyamide-based dispersant, a polyamideimide-based dispersant, and polyaryl sulfone-based dispersants, polyetherimide-based dispersants, polyethersulfone-based dispersants, polyphenylene sulfide-based dispersants, and polyimide-based dispersants; Polyether ketone-based dispersant, polybenzoxazole-based dispersant, polyoxadiazole-based dispersant, polybenzothiazole-based dispersant, polybenzimidazole-based dispersant, polypyridine-based dispersant, polytriazole-based dispersant, polypyrrolidine-based dispersant, polydibenzofuran A dispersing agent, polysulfone-based dispersant, polyurea-based dispersant, polyurethane-based dispersant, or polyphosphazene-based dispersant may be used, any one of which may be used alone or a mixture or copolymer of two or more selected among them may be used may be

In addition, the physical property enhancing component may further include a dispersion stabilizer, and the dispersion stabilizer may use those known in the art, so that the specific type thereof is not limited in the present invention, and as a non-limiting example thereof, an anionic Surfactants, cationic surfactants, nonionic surfactants, wetting agents or wettability improvers and the like can be used.

That is, in the present invention, the protective coating layer 130 may be used without limitation as long as it is a method capable of adding the protective coating layer-forming composition to the surface to be coated on the surface of the graphite substrate 110 , and as a non-limiting example thereof , blade (blade) coating, flow (flow) coating, casting (casting), printing method, transfer (transfer) method, brushing, dipping (dipping) or spraying (spraying) by a method such as the above-described protective coating layer forming composition It may be coated on the surface of the graphite substrate. At this time, the viscosity of the composition for forming the protective coating layer may be 1 to 100,000 cps .

Meanwhile, in the drawings and descriptions, the plastic injection molded body 100 according to the present invention is illustrated and described as being formed of a plate-shaped member, but the present invention is not limited thereto, and may be provided to have various shapes according to the required use.

In addition, the plastic injection molded body 100 according to the present invention may be applied to various parts or cases requiring at least one performance of heat dissipation and electromagnetic wave shielding.

For example, the plastic injection molded body 100 utilizes the electrical conductivity of graphite to provide an antistatic property (antistatic, 1 kΩ/sq) to a semiconductor chip tray, a wafer container, and a static dissipative (0.1 to 1 kΩ) area. /sq), etc., can be applied to energy storage media fields such as supercapacitors, and can be applied to heat dissipation materials to solve heat dissipation from electronic components as the miniaturization and slimming of digital devices are rapidly progressing. , it can also be applied to the lighting field, which requires the development of light-weight heat dissipation materials.

In addition, when graphite is dispersed, it exhibits excellent gas barrier properties even when a very small amount is dispersed. Micro actuators manufactured using the electrical, mechanical, and thermal properties of graphite have large displacement and fast response speed even at low power, and exhibit excellent characteristics that the displacement increases as the temperature increases. It can be used as an imitation application device.

In particular, the plastic injection molded article according to the present invention is manufactured by die-casting using an alloy such as zinc, aluminum, tin, copper, magnesium, etc. in various ways such as automobile parts, electrical equipment, optical equipment, vehicles, weaving machines, construction, and measuring instruments. It can be used to replace parts, and it will be used in various fields such as the electronics industry, energy, and automobile/aerospace industries.

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Although one embodiment of the present invention has been described above, the spirit of the present invention is not limited to the embodiments presented herein, and those skilled in the art who understand the spirit of the present invention can add components within the scope of the same spirit. , changes, deletions, additions, etc. may easily suggest other embodiments, but this will also fall within the scope of the present invention.

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100: plastic injection molding having heat dissipation and electromagnetic wave shielding properties
110: graphite base
111: matrix
112: graphite-nanometal composite
120: reinforcement support
121: border member
122: connecting member
130: protective coating layer

Claims (12)

a graphite substrate comprising a matrix and a graphite-nanometal composite dispersed on the matrix and having nanometal particles bonded to the surface of the graphite;
a reinforcing support made of a metal material and embedded in the graphite substrate; and
At least one fastening hole formed in the graphite substrate for fastening with other parts;
The graphite substrate and the reinforcing support are integrally formed through insert molding,
The fastening hole is located directly above the reinforcing support and is formed to penetrate the reinforcing support embedded in the graphite substrate. A plastic injection molded body having heat dissipation and electromagnetic wave shielding properties. The method of claim 1,
The reinforcing support is a plastic injection molded body having heat dissipation properties and electromagnetic wave shielding properties including any one of magnesium or aluminum. The method of claim 1,
The reinforcing support includes a circular or polygonal rim member and a connecting member having both ends connected to the rim member,
The connecting member is a plastic injection molded body having heat dissipation properties and electromagnetic wave shielding properties that are formed to have any one of a grid shape, a honeycomb shape, a straight shape, a curved shape, and a shape in which they are combined. delete The method of claim 1,
The nano-metal particles are crystallized nanoparticles, plastic injection molding having heat dissipation and electromagnetic wave shielding properties. The method of claim 1,
The graphite-nanometal composite further comprises a polydopamine layer coated on the nanometal particles,
The graphite-nanometal composite is a plastic injection molded article having heat dissipation and electromagnetic wave shielding properties contained in 50 to 80% by weight in the graphite substrate. The method of claim 1,
The graphite substrate includes a protective coating layer formed on the outer surface,
The protective coating layer is a plastic injection molded article having heat dissipation properties and electromagnetic wave shielding properties made of a composition for forming a protective coating layer comprising a polymer resin. 8. The method of claim 7,
The composition for forming a protective coating layer is a plastic injection molded article having heat dissipation properties and electromagnetic wave shielding properties including an epoxy resin and a carbon-based filler to improve thermal diffusion to the outside. delete delete delete delete

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