KR20210084007A - Core-shell hybrid structured heat dissipating particles, and composites comprising the same - Google Patents

Abstract

Disclosed are a heat dissipation particle of a core-shell hybrid structure including: a core; a first coating layer formed by coating an inorganic binder on the core; and a second coating layer formed by coating plate-shaped hexagonal boron nitride (h-BN) on the first coating layer, and a composite including the same.

Description

Core-shell hybrid structured heat dissipating particles, and composites comprising the same

The present invention relates to heat-dissipating particles having a core-shell hybrid structure and a composite including the same, and more specifically, to a high thermal conductivity by using an inorganic binder having high thermal conductivity on the surface of various core materials such as polymers, ceramics, and metals. It relates to a heat-dissipating particle of a core-shell hybrid structure coated with a plate-shaped hexagonal boron nitride (hereinafter also referred to as 'h-BN') and a composite including the same.

Recently, as electronic devices such as smartphones, electric vehicles, displays, and electronic devices such as semiconductor integrated circuits (ICs) and parts/modules have become high-speed, highly integrated, stacked, miniaturized, and thinned, high thermal energy is generated locally, resulting in device reliability and lifespan. Therefore, high heat dissipation performance is required.

Current heat dissipation products are composed of various materials such as metals, nitrides, oxides, carbides, and carbon-based materials (CNT, Graphene), and are divided into metals and carbon-based materials with electrical conductivity and oxides, nitrides and carbides with electrical insulation.

High heat dissipation products are realized by maximizing thermal conductivity by increasing the filling rate of heat dissipating particles, or by controlling orientation using the thermal conductivity anisotropy of heat dissipating materials. In addition, since lightness is important for electric vehicles, materials that simultaneously satisfy electrical insulation, high heat dissipation, and low specific gravity characteristics are attracting attention.

Hexagonal boron nitride (h-BN), which is a high heat dissipation material, is a plate-shaped particle, so when pressure is applied to increase the filling rate, it is oriented in the horizontal direction. Accordingly, in the horizontal direction, the interface density per unit area is low and thermal conductivity is high, but in the vertical direction, since the interface density is very high, the thermal conductivity is greatly reduced. That is, when plate-shaped particles such as hexagonal boron nitride are used as a filler, there is a fundamental limitation in not being able to realize isotropic heat dissipation performance by itself.

In this regard, a core-shell structure powder particle manufacturing technique for forming a shell layer containing boron nitride on the surface of an inorganic particle core such as alumina or silicon dioxide has been disclosed in Prior Patent Documents 1 and 2, and the like.

In Prior Patent Document 1, as shown in FIG. 1, by mixing spherical alumina (Al2O3) and hexagonal boron nitride (h-BN) and heating to a temperature of about 1500° C., hexagonal boron nitride (h-BN) is There is a technology that melts and coats the surface of spherical alumina (Al2O3) by surface tension. However, since a heating process at a high temperature of about 1500°C is required, there is a limit to the material of the material to be used as a core, as well as energy consumption. And there is a problem that the manufacturing process becomes complicated.

On the other hand, in Prior Patent Document 2, as shown in FIG. 2 , as a granulated powder capable of manufacturing a heat dissipation sheet or a heat dissipation member having excellent thermal conductivity in the thickness direction, the inorganic particle core part 310 and the core part 310 . It has a shell part 320 covering the surface, and the shell part 320 is a scale-shaped boron nitride particle 20 and a granulated powder including a binder resin is disclosed, but the inorganic particle core surface is nitrated in the form of scales. Since it is difficult to directly coat the boron particles, there is a problem in that a resin for binding is used together as a shell layer.

On the other hand, the prior patent document 3 discloses an organic-inorganic composite filler for coating boron nitride on the surface of spherical alumina using a polymer binder, but the polymer binder is an essential element for coating the boron nitride particles, whereas it lowers the thermal conductivity, so heat dissipation There is a disadvantage in that it does not become an effective binder material in terms of performance. That is, in order to thickly coat boron nitride on the surface of alumina to increase thermal conductivity, more polymer binders must be used proportionally, resulting in a problem of thermal conductivity performance degradation.

Republic of Korea Patent Publication No. 10-2016-0008320 Japanese Patent Laid-Open Publication JP2016-192474A Republic of Korea Patent Publication No. 10-2019-0128935

The present invention has been devised to solve the problems in the prior art as described above, and is a plate-shaped hexagonal nitride having high thermal conductivity by using an inorganic binder having high thermal conductivity on the surface of various core materials such as polymers, ceramics, and metals. An object of the present invention is to provide a thermal radiation particle having a core-shell hybrid structure coated with boron (h-BN) and a composite including the same.

In addition, the present invention implements an effective heat conduction network by coating a plate-shaped hexagonal boron nitride (h-BN) material using an inorganic binder on the surface of a core material having a linear shape to achieve a light weight and high heat dissipation performance. Core-shell hybrid Another object of the present invention is to provide a heat-dissipating particle having a structure and a composite including the same.

In addition, the present invention provides heat-dissipating particles of a core-shell hybrid structure that simultaneously satisfy lightness and heat dissipation by coating a lightweight polymer core material with a hexagonal boron nitride (h-BN) material using an inorganic binder, and a composite including the same. It serves another purpose to provide.

In addition, the present invention provides electrical insulation by coating a hexagonal boron nitride (h-BN) material on the surface of a metal core using an inorganic binder, thereby satisfying high thermal conductivity and withstand voltage characteristics at the same time. And it is another object to provide a complex comprising the same.

In addition, the present invention uses an inorganic binder on the surface of a magnetic core to coat a hexagonal boron nitride (h-BN) material to suppress eddy current loss, thereby satisfying high thermal conductivity and electromagnetic wave absorption in a high frequency band at the same time. Another object of the present invention is to provide a heat-dissipating particle having a structure and a composite including the same.

The problem to be solved by the present invention is not limited to the technical problems mentioned above, and other technical problems not mentioned can be clearly understood by those of ordinary skill in the art to which the present invention belongs from the following description. will be.

In accordance with an embodiment of the present invention for achieving the above object, there is provided a heat dissipation particle having a core-shell hybrid structure, comprising: a core; a first coating layer coated with an inorganic binder on the core; and a second coating layer coated with plate-shaped hexagonal boron nitride (h-BN) on the first coating layer.

In the above embodiment, the core is one selected from the group consisting of polymer, graphite, diamond, aluminum oxide, aluminum hydroxide, aluminum nitride, silicon carbide, magnesium oxide, zinc oxide, and spheroidized hexagonal boron nitride (h-BN). may include more than one.

In addition, in the embodiment, the core may include at least one selected from the group consisting of copper-based, nickel-based, iron-based, cobalt-based, MnZn-based ferrite, and NiZn-based ferrite.

Also, in the embodiment, the inorganic binder may include at least one selected from the group consisting of silicon oxide, magnesium oxide, beryllium oxide, zinc oxide, calcium oxide, copper oxide, nickel oxide, and phosphorus oxide.

In addition, in the embodiment, the plate-shaped hexagonal boron nitride (h-BN) preferably has an average size of 0.1 to 5 times the average diameter of the core. If it is less than 0.1 times, it is difficult to contribute to the improvement of thermal conductivity performance, and if it exceeds 5 times, it is difficult to coat with the second coating layer.

In addition, in the heat dissipation particle of a core-shell hybrid structure according to another embodiment of the present invention, it is preferable that the core in the embodiment is a linear core. This is because an effective heat conduction path is formed so that a certain level of heat conduction performance can be obtained even when a smaller amount is used in manufacturing the heat dissipation member, thereby helping to reduce the weight.

In addition, in the embodiment, the core may include at least one selected from the group consisting of polymer, glass fiber, carbon fiber, metal, oxide, carbide, and nitride.

Further, in the above embodiment, the core has an aspect ratio of 3 or more, and has an average diameter of 0.1 to 200 um. If it is outside the above range, it is difficult to coat the hexagonal boron nitride (h-BN).

In addition, in the heat dissipation particles of the core-shell hybrid structure according to another embodiment of the present invention, the graphene coating layer is further coated on the second coating layer in the embodiment, or between the core and the first coating layer, or It further includes a graphene coating layer coated between the first coating layer and the second coating layer. This is because the heat dissipation performance can be improved by enhancing the fluidity or dispersibility of the polymer resin substrate of the heat dissipation member (sheet) to increase the packing density of the heat dissipation particles or through high thermal conductivity inherent to graphene.

In addition, in the heat dissipation particle of the core-shell hybrid structure according to another embodiment of the present invention, the first coating layer and the second coating layer are repeatedly coated on the second coating layer in the embodiment.

In addition, the composite according to another embodiment of the present invention includes the core-shell hybrid structure of the heat dissipation particles in the above embodiments.

In the above embodiment, it is preferable to further include at least one selected from the group consisting of hollow glass beads, graphite, carbon fiber, and mica.

According to an embodiment of the present invention, as a heat dissipation particle of a core-shell hybrid structure, the core; and a first coating layer for coating an inorganic binder on the surface of the core, and a second coating layer made of plate-shaped hexagonal boron nitride (h-BN), thereby providing a heat dissipation material implementing isotropic high heat dissipation performance.

In addition, according to another embodiment of the present invention, a hexagonal boron nitride (h-BN) material is coated on a lightweight polymer core material using an inorganic binder to provide high thermal conductivity, thereby satisfying both light weight and heat dissipation. material can be provided.

In addition, according to another embodiment of the present invention, an effective heat conduction network is formed by coating a plate-shaped hexagonal boron nitride (h-BN) material on the surface of a polymer material having a linear shape using an inorganic binder to form a lightweight and high heat dissipation It is possible to provide heat dissipating particles having a core-shell structure having performance.

In addition, according to another embodiment of the present invention, by coating a hexagonal boron nitride (h-BN) material on the surface of a metal core using an inorganic binder to give electrical insulation, a material that simultaneously satisfies high thermal conductivity and withstand voltage characteristics can provide

1 is an explanatory diagram of the manufacturing process of boron nitride coated heat dissipation particles according to the prior art;
2 is a schematic diagram of a boron nitride coated heat dissipation particle according to another prior art,
3 is a conceptual diagram of a heat dissipation particle having a core-shell hybrid structure according to an embodiment of the present invention;
4 is a conceptual diagram of a heat dissipation particle having a core-shell hybrid structure having a linear core according to an embodiment of the present invention;
5 to 7 are conceptual views of heat-dissipating particles having a core-shell hybrid structure additionally having a graphene coating layer according to an embodiment of the present invention;
8 is a conceptual diagram of heat dissipation particles having a core-shell hybrid structure having a repeating structure of a coating layer according to an embodiment of the present invention;
9 is a microphotograph of heat dissipation particles having a core-shell hybrid structure prepared according to Example 2 of the present invention.

Hereinafter, specific embodiments in which the present invention may be practiced will be described in detail by way of illustration. These embodiments are described in sufficient detail to enable those skilled in the art to practice the present invention. It should be understood that the various embodiments of the present invention are different but need not be mutually exclusive. For example, certain shapes, structures, and characteristics described herein may be implemented in other embodiments without departing from the spirit and scope of the present invention with respect to one embodiment. Accordingly, the detailed description set forth below is not intended to be taken in a limiting sense, and the scope of the invention, if properly described, is limited only by the appended claims, along with all scope equivalents to those claimed.

3 is a conceptual diagram of a heat dissipation particle having a core-shell hybrid structure according to an embodiment of the present invention, and FIG. 4 is a conceptual diagram of a heat dissipation particle having a core-shell hybrid structure having a linear core according to an embodiment of the present invention.

As schematically shown in FIG. 3 , the heat dissipation particle of a core-shell hybrid structure according to an embodiment of the present invention includes a core 100; a first coating layer 200 coated with an inorganic binder on the surface of the core 100; and a second coating layer 300 formed by coating the first coating layer 200 with a plate-shaped hexagonal boron nitride (h-BN) material, and is manufactured to have isotropic high thermal conductivity.

The core 100 is at least one selected from the group consisting of polymer, graphite, diamond, aluminum oxide, aluminum hydroxide, aluminum nitride, silicon carbide, magnesium oxide, zinc oxide, and spheroidized hexagonal boron nitride (h-BN), Or it may be at least one selected from the group consisting of copper-based, nickel-based, iron-based, cobalt-based, MnZn-based ferrite, and NiZn-based ferrite. It is preferable that the core 100 selects and uses a core of an appropriate material to meet the required characteristics such as lightness, electromagnetic wave absorption ability, and withstand voltage as well as thermal conductivity.

In addition, as schematically shown in FIG. 3 , the core 100 may be used by selecting variously selected core materials of arbitrary shapes such as linear, plate, and amorphous as well as spherical.

The first coating layer 200 made of the inorganic binder is not particularly limited as long as it is a material capable of increasing the adhesion between the core and the plate-shaped hexagonal boron nitride (hBN), but for example, silicon oxide, magnesium oxide, beryllium oxide, zinc oxide. , calcium oxide, copper oxide, nickel oxide, and at least one selected from the group consisting of phosphorus oxide.

The inorganic binder is preferably coated by a sol-gel method in order to be uniformly applied on the core 100 . A material in which a solution state undergoes a hydration-condensation reaction can be obtained by using a molecular precursor that forms a sol. It can be synthesized at low temperature, can control various shapes and microstructures, can improve homogeneity, and can be environmentally friendly, and all raw materials that generate -OH groups can be used as materials, and the sintering temperature of the polymer is below 200℃. It has the advantage that it can be applied to the core.

The thickness of the first coating layer 200 located on the surface of the core 100 does not need to be limited, but if the average thickness of the first coating layer 200 is less than 0.1 μm, between the core and the plate-shaped hexagonal boron nitride (h-BN) Adhesion may decrease. In addition, as in the prior art, when the thickness of the organic binder exceeds 2 μm, thermal conductivity is reduced, but in the case of the inorganic binder as described above, there is no reduction in thermal conductivity, so the thickness is not limited. Therefore, there is an advantage that high thermal conductivity can be realized by enabling a thick h-BN coating layer while increasing the adhesion between the core and h-BN.

Each of the plate-shaped hexagonal boron nitride (h-BN) particles forming the second coating layer 300 has an average size of 0.1 to 5 times the average diameter of the core 100 . If it is less than 0.1 times, the thermal conductivity performance is lowered, and if it exceeds 5 times, it is difficult to coat with the second coating layer. Although schematically shown in FIG. 3 , the second coating layer 300 means the entire layer structure in which the plate-shaped hexagonal boron nitride particles are coated while forming one or a plurality of layers on the first coating layer 200 . The overall thickness or coating amount of the second coating layer 300 is determined by the input amount of the plate-shaped hexagonal boron nitride particles in the mixing process.

In this way, when the inorganic binder is coated on the core 100 to form the first coating layer 200 and then the second coating layer 300 is formed with plate-shaped hexagonal boron nitride (h-BN), due to the adhesive force of the inorganic binder The adhesion between the core and the plate-shaped hexagonal boron nitride (h-BN) is increased. From this, the plate-shaped hexagonal boron nitride (hBN) particles do not separate from the core by the shear force generated in the kneading process of manufacturing the heat dissipation composite member by mixing the coated heat dissipating particles and the polymer resin, so the fluidity of the mixed solution slurry does not decrease and the heat dissipation particles It is possible to increase the filling rate of

In addition, since an inorganic binder with high thermal conductivity is used (eg, SiO2 1.2W/mK, MgO 30W/mK, ZnO 50W/mK), a polymer-based organic binder (eg, 0.2-0.4W/mK) ), and the thermal conductivity is much better than that of the heat-dissipating particles according to the prior art coated with h-BN.

In the heat dissipation particle of the core-shell hybrid structure according to another embodiment of the present invention, the core in the embodiment is characterized in that it consists of a linear core 100 as schematically shown in FIG. 4 .

In this case, an effective heat conduction path is formed by the linear core, so that a certain level of heat conduction performance is obtained even when a smaller amount of heat radiating particles are injected during the manufacture of the heat dissipation composite member, which is advantageous for weight reduction and cost competitiveness.

In addition, in the above embodiment, the linear core 100 preferably includes at least one selected from the group consisting of polymers, glass fibers, carbon fibers, metals, oxides, carbides, and nitrides in consideration of the convenience of manufacturing. Do.

In addition, in the above embodiment, the linear core 100 preferably has an aspect ratio of 3 or more, and has an average diameter of 0.1 to 200 um. If it is out of the above range, it is because h-BN coating is difficult.

5 to 7 are conceptual views of heat dissipation particles having a core-shell hybrid structure additionally having a graphene coating layer according to an embodiment of the present invention, and FIG. 8 is a coating layer having a repeating structure according to an embodiment of the present invention. It is a conceptual diagram of a heat dissipation particle of a core-shell hybrid structure.

In the heat dissipation particle of the core-shell hybrid structure according to another embodiment of the present invention, as shown in FIG. 5 , the graphene coating layer 400 coated on the second coating layer 300 which was the outermost layer in the embodiment ), or further comprising a graphene coating layer 400 coated between the core 100 and the first coating layer 200 as shown in FIG. 6, or as shown in FIG. A graphene coating layer 400 coated between the first coating layer 200 and the second coating layer 300 is further included.

This is because the heat dissipation performance can be improved by enhancing the fluidity or dispersibility of the heat dissipating member (sheet) in the polymer resin substrate to increase the packing density of the heat dissipating particles, or through high thermal conductivity inherent to graphene.

In addition, in the heat dissipation particle of a core-shell hybrid structure according to another embodiment of the present invention for further improvement of thermal conductivity, as shown in FIG. 8 , on the second coating layer 300 in the embodiment , the first coating layer 200 and the second coating layer 300 may be repeatedly coated and laminated. Additional repeated laminations are of course possible if necessary.

On the other hand, in order to make a heat dissipation material with high thermal conductivity, heat dissipation particles must be maximally filled in a curable polymer matrix. If the core and plate-shaped hexagonal boron nitride (h-BN) particles are simply mixed, an effective heat transfer network cannot be formed and the filling rate It falls far short of this theory.

In addition, even when the plate-shaped hexagonal boron nitride (hBN) coated core-shell heat dissipation particles are used, the hBN particles are separated from the core surface due to the high shear force generated during kneading with the polymer resin, and the viscosity is greatly increased, thereby lowering the filling rate. The thermal conductivity is greatly reduced. However, in the present invention, as described above, the above problems can be solved by coating the plate-shaped hexagonal boron nitride (hBN) particles using an inorganic binder having high thermal conductivity and high adhesion.

The composite according to another embodiment of the present invention includes the heat dissipation particles of the core-shell hybrid structure in the above embodiments.

As described above, the heat dissipation particles of the core-shell hybrid structure prepared according to an embodiment of the present invention are mixed with a thermosetting or thermoplastic polymer matrix to prepare a heat dissipation composite.

As the polymer, polystyrene (PS), polyvinyl chloride (PVC), polymethyl methacrylate (PMMA), acrylonitrile butadiene styrene (ABS), polyethylene (polyethylene) , PE), polypropylene (PP), polyethylene terephthalate (PET), polyester (PE), polyvinyl alcohol (PVA), polydimethylsiloane (PDMS), etc. A thermoplastic or thermosetting resin known in the art may be used.

In the case of the curing agent, it is preferable to mix it in a mass ratio of 1:99 to 10:90 compared to the curable polymer matrix.

Mixing of the heat dissipating particles of the core-shell hybrid structure and the curable polymer matrix is performed by physical stirring, and it is preferable that the heat dissipation particles of the core-shell hybrid structure have a volume ratio of 30 to 95% compared to the polymer matrix.

On the other hand, the composite, it is preferable to further include at least one selected from the group consisting of hollow glass beads, graphite, carbon fiber, and mica.

In this case, additional weight reduction, mechanical properties and electrical properties of the heat dissipation member can be improved, and the mixing ratio is required for thermal conductivity, specific gravity, mechanical properties (strength, toughness, etc.), electrical properties (withstanding voltage, electromagnetic wave absorption capacity, electromagnetic wave noise reduction). effect, etc.) can be comprehensively considered.

(Example 1) Alumina core hBN coating

Put an alumina core (50 g) with an average particle size of 70 μm and a ZnO sol-gel inorganic binder (1 mL) into a 150 cc stirrer, mix at room temperature for 5 minutes, and heat-treat at 170° C. to prepare coated heat-dissipating particles. In this case, the ZnO sol-gel inorganic binder is prepared mainly from zinc acetate anhydride (1 g) in an ethanolamine solvent. Thereafter, the plate-shaped h-BN particles (10% by weight) having an average particle size of 15 μm are put into the powder mixer, and the rotation speed is sequentially increased to 500 - 2000 rpm for coating. Then, the heat dissipation sheet is prepared by injecting the coated heat dissipation particles in the PDMS silicone resin at a volume ratio of 65%.

(Example 2) spherical polymer core hBN coating

A polymer core (3g) having an average particle size of 20um and an MgO sol-gel inorganic binder (1mL) are put in a 150cc stirrer, mixed at room temperature for 5 minutes, and then heat-treated at 150° C. to prepare coated heat dissipation particles. At this time, the MgO sol-gel inorganic binder is prepared by stirring magnesium acetic anhydride (1 g, Mg acetate dehydrate) and 0.25 g of ethanolamine as main components. After that, plate-shaped h-BN particles (20% by weight) having an average particle size of 5 μm are added to the powder mixer and then coated by sequentially increasing the rotation speed up to 500 - 2000 rpm. Thereafter, the coated heat radiation particles in the PDMS silicone resin are added in a 65% volume ratio to prepare a heat radiation sheet.

(Example 3) Linear polymer core hBN coating

A linear polymer (2 g) having an average diameter of 10 μm and an average length of 300 μm and a ZnO sol-gel inorganic binder (1 mL) are put in a 150 cc stirrer, mixed at room temperature for 5 minutes, and then heat-treated at 170° C. to prepare coated heat radiation particles. At this time, the ZnO sol-gel inorganic binder is prepared by stirring 0.8 g of zinc acetate anhydride and 0.25 g of ethanolamine as main components. Thereafter, plate-shaped h-BN particles (20% by weight) having an average particle size of 2 μm are added to the powder mixer and then coated by sequentially increasing the rotation speed up to 500 - 2500 rpm. Thereafter, the coated heat dissipation particles in the PDMS silicone resin are added at a volume ratio of 55% to prepare a heat dissipation sheet.

(Example 4) CIP core hBN coating

CIP powder (70g; Carbonyl Iron Powder) having an average diameter of 5um and MgO sol-gel inorganic binder (1mL) are put in a 150cc stirrer, mixed at room temperature for 5 minutes, and then heat-treated at 150°C to prepare coated heat dissipation particles. At this time, the MgO sol-gel inorganic binder is prepared by stirring 0.5 g of Mg acetate dehydrate and 0.1 g of ethanolamine as main components. Then, plate-shaped h-BN particles (weight ratio 5%) of 2um average particle size are put into the powder mixer, and the rotation speed is sequentially increased to 500-1500rpm for coating. Thereafter, the coated heat radiation particles in the PDMS silicone resin are added in a 65% volume ratio to prepare a heat radiation sheet.

(Comparative Example 1) hBN coating using organic binder

Put an alumina core (50g) with an average particle size of 70um and polyvinylpyrrolidone (PVP) powder (0.5g) into a 150cc stirrer and mix at room temperature for 10 minutes. Thereafter, the plate-shaped h-BN particles (10% by weight) having an average particle size of 15 μm are put into the powder mixer, and the rotation speed is sequentially increased to 500 - 2000 rpm for coating. Thereafter, the coated heat dissipation particles in the PDMS silicone resin were added in a 65% volume ratio (same as in Example 1) to prepare a heat dissipation sheet.

(Comparative Example 2) Polymer powder not coated with hBN

Using a non-hBN-coated polymer core (3 g) having an average particle size of 20 μm, the polymer powder in the PDMS silicone resin was added in a 65% volume ratio (same as in Example 2) to prepare a heat dissipation sheet.

(Comparative Example 3) hBN uncoated CIP

Using CIP powder (70 g) having an average diameter of 5 μm not coated with hBN, the CIP powder in the PDMS silicone resin was added in a 65% volume ratio (same as Example 4) to prepare a heat dissipation sheet.

For each of the heat dissipation sheets of Examples and Comparative Examples prepared as above, thermal conductivity was measured as thermal diffusion coefficient (ai-Phase, M3), specific heat (Shimadzu, DSC60), specific gravity (Precisa, 320XT), and withstand voltage (Chroma, 19052) were respectively measured and multiplied by each other, and the results are shown in Table 1 below.

Example 1 Comparative Example 1 Example 2 Example 3 Comparative Example 2 Example 4 Comparative Example 3 thermal conductivity
(W/mK) 3.2 2.5 1.2 1.4 0.5 4.2 2.5 importance
(g/cc) 3.0 3.0 1.3 1.3 1.3 3.5 3.5 withstand voltage
(V) 4000 4000 4000 4000 4000 1000 0

The thermal conductivity improvement effect of the inorganic binder was increased by 25% under the same conditions in which the powder coated with hBN particles was used as a heat dissipation filler through the thermal conductivity measurement results of Example 1 (using an inorganic binder) compared to Comparative Example 1 (using an organic binder) appear.

Comparative Example 2 (using hBN-coated polymer core) compared to Example 2 (using hBN-coated polymer core) compared to Comparative Example 2 (using hBN-coated polymer core) showed that the thermal conductivity increased by more than 2 times, and the improvement effect is large. In addition, since the specific gravity of Comparative Example 1 is 1/2 or less, the lightness improvement effect according to the use of the polymer core appears.

Through the measurement result of the thermal conductivity of Example 3 (using a linear polymer core) compared to Example 2 (using a spherical polymer core), the effect of increasing the thermal conductivity by 17% was measured even though the input amount decreased from 65% to 55%.

Comparative Example 3 (using CIP core without hBN coating) compared to Example 4 (using hBN coated CIP core) Through the measurement result, the thermal conductivity was improved by 68% and the withstand voltage increased to 1000V, so the inorganic binder and hBN coating effect was confirmed to be large.

100: core
200: first coating layer
300: second coating layer
400: graphene coating layer

Claims (14)

core;
a first coating layer coated with an inorganic binder on the core; and
A second coating layer coated with plate-shaped hexagonal boron nitride (h-BN) on the first coating layer; including, a core-shell hybrid structure of heat dissipation particles. The method according to claim 1,
The core comprises at least one selected from the group consisting of polymer, graphite, diamond, aluminum oxide, aluminum hydroxide, aluminum nitride, silicon carbide, magnesium oxide, zinc oxide, and spheroidized hexagonal boron nitride (h-BN), Heat dissipation particles with a core-shell hybrid structure. The method according to claim 1,
The core includes at least one selected from the group consisting of copper-based, nickel-based, iron-based, cobalt-based, MnZn-based ferrite, and NiZn-based ferrite. The method according to claim 1,
The inorganic binder comprises at least one selected from the group consisting of silicon oxide, magnesium oxide, beryllium oxide, zinc oxide, calcium oxide, copper oxide, nickel oxide, and phosphorus oxide, a core-shell hybrid structure of heat dissipation particles. The method according to claim 1,
The plate-shaped hexagonal boron nitride (h-BN) has an average size of 0.1 or more and 5 times or less compared to the average diameter of the core, a core-shell hybrid structure of heat dissipation particles. The method according to claim 1,
The core is a linear core, core-shell hybrid structure heat dissipation particles. 7. The method of claim 6,
The core comprises at least one selected from the group consisting of polymers, glass fibers, carbon fibers, metals, oxides, carbides, and nitrides, core-shell hybrid heat dissipation particles. 7. The method of claim 6,
The core has an aspect ratio of 3 or more, and has an average diameter of 0.1 to 200 um, a core-shell hybrid structure of heat dissipation particles. The method according to claim 1,
Further comprising a graphene coating layer coated on the second coating layer, core-shell hybrid structure heat dissipation particles. The method according to claim 1,
Further comprising a graphene coating layer coated between the core and the first coating layer, the core-shell hybrid structure of heat dissipation particles. The method according to claim 1,
Further comprising a graphene coating layer coated between the first coating layer and the second coating layer, the core-shell hybrid structure of heat dissipation particles. The method according to claim 1,
A heat dissipation particle having a core-shell hybrid structure in which a first coating layer and a second coating layer are repeatedly stacked on the second coating layer. A composite comprising the heat dissipating particles of the core-shell hybrid structure according to any one of claims 1 to 12. 14. The method of claim 13,
The composite, further comprising at least one selected from the group consisting of hollow glass beads, graphite, carbon fiber, and mica.

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