KR20180073413A - Heat-releasing sheet and preparing method for the same - Google Patents

Abstract

The present invention relates to a heat-releasing sheet and a preparing method thereof. The heat-releasing sheet includes: a filler having an iron oxide; a silicone resin; and a mattress including at least one crosslinking agent selected from a group consisting of poly-hydrogen-siloxane-based and organic-peroxidation-based crosslinking agents. The preparing method of the heat-releasing sheet includes the steps of: mixing the iron oxide, the silicone resin, and the crosslinking agent to form a complex, and crosslinking and hardening the complex. According to the present invention, it is possible to use the iron oxide without a separate process and to acquire excellent heating performance.

Description

[0001] HEAT-RELEASING SHEET AND PREPARING METHOD FOR THE SAME [0002]

The present invention relates to a heat-radiating sheet and a method of manufacturing the heat-radiating sheet, and more particularly, to a heat-radiating sheet and a method of manufacturing the same, and more particularly to an electronic device And a method of manufacturing the same.

Recently, with the development of information and communication technology (ICT) including smart phones, smart TVs, wearable electronic devices, futuristic automobiles, and Internet (IOT), there has been a trend of ultra thinning, Technology development of highly integrated and highly functional electronic components is underway. In addition to the rapid performance improvement of such electronic products, the amount of heat generated in electronic products is also greatly increased, and there is a need for efficient heat dissipation materials.

Heat accumulation in electronic components has a great influence on the performance and lifespan of electronic components, and it causes the product to fail or malfunction, thereby reducing the reliability of the product. Furthermore, it may cause explosion and fire. Conventionally, heat dissipating plates, heat dissipating fans, and heat pipes using metals such as copper and aluminum having high thermal conductivity have been generally used for efficient heat dissipation. However, in the case of the above-mentioned products made of metal, since the isotropy is realized in the heat conduction, the heat conduction in the vertical direction is excellent, but the heat conduction in the horizontal direction is not realized effectively. Very low. Therefore, complex equipment such as installing a heat sink and a heat radiating fan at the same time is required. In this case, there is a problem that it is difficult to apply to a lightweight and ultra thin electronic product.

Accordingly, heat-radiating sheets using metal powder (copper or copper alloy), carbon materials (graphite, expanded graphite, carbon nanotube, carbon fiber) and ceramic (boron nitride) as fillers have been developed. However, when metal powder is used as a filler, it is difficult to disperse the filler due to the difference in specific gravity between the polymer matrix and the filler, so that it is difficult to form a network of the filler in the composite and it is difficult to lighten the filler due to its specific gravity. On the other hand, when the carbon material is used as a filler, the heat radiation performance is excellent. However, as the temperature increases, the contact resistance due to phonon scattering increases, problems such as malfunction of the electronic product due to high- . In addition, when boron nitride, which is a typical example of ceramics, is used as a filler, the heat dissipation performance and insulation are both excellent, but the cost is higher than other materials, so the cost of the product is greatly increased and the production of large particles, It has a drawback in that it does not hold.

On the other hand, iron oxide is a by-product that is produced mainly during the pickling process of a steel mill. For commercial sale, iron oxide is required to be classified according to the degree of oxidation of iron oxide and the size of the powder. Iron oxide is more important than most metal powder (copper or copper alloy) (Graphite, expanded graphite, carbon nanotubes, and carbon fibers) and has a lower electrical conductivity than ceramics (boron nitride).

Therefore, when the iron oxide is used for the heat-radiating sheet using such a characteristic, it is expected that the heat-radiating sheet having the excellent heat-radiating performance can be utilized commercially without any additional process and as a by-product in the pickling process of the steelworks .

One aspect of the present invention is to provide a heat-radiating sheet which can utilize iron oxide commercially and has excellent heat radiation performance.

Another aspect of the present invention is to provide a method of manufacturing such a heat-radiating sheet.

According to one aspect of the present invention, a filler comprising iron oxide; Silicone resin; And a mattress comprising at least one crosslinking agent selected from the group consisting of polyhydrogensiloxane-based and organic peroxide-based crosslinking agents.

According to another aspect of the present invention, there is provided a method for producing a composite material, comprising: mixing at least one crosslinking agent selected from the group consisting of iron oxide, a silicone resin, and a polyhydrogensiloxane-based material and an organic peroxide-based crosslinking agent to form a composite; And crosslinking and curing the composite.

According to the inventive sheet of the present invention, iron oxide can be used without any additional process, and excellent heat-generating performance can be obtained.

Hereinafter, preferred embodiments of the present invention will be described. However, the embodiments of the present invention can be modified into various other forms, and the scope of the present invention is not limited to the embodiments described below.

According to the present invention, there is provided a heat-radiating sheet capable of using iron oxide without any additional process and exhibiting excellent heat-radiating performance. According to the heat-radiating sheet of the present invention, a heat-radiating sheet exhibiting excellent heat-radiating performance utilizing iron oxide, which is a by- .

The heat-radiating sheet of the present invention is composed of a mattress resin and a filler, and more specifically, a filler containing iron oxide; Silicone resin; And a mattress comprising at least one crosslinking agent selected from the group consisting of polyhydrogensiloxane-based and organic peroxide-based crosslinking agents.

The iron oxide is preferably in powder form.

The silicone resin that may be used in the present invention comprises polydiorganosiloxanes capped at both ends with vinyl groups, wherein the polydiorganosiloxane may be substituted with one or more alkyl groups, alkenyl groups, or combinations thereof per molecule.

More specifically, the silicone resin may be a silicone resin having a structure represented by the following formula (1).

[Chemical Formula 1]

CH ₂ CHR ¹ ₂ SiO (R ² ₂ SiO) _a SiR ³ ₂ CHCH ₂

Wherein R ¹ , R ² and R ³ are each independently selected from the group consisting of hydrogen, a linear or branched alkyl group having 1 to 10 carbon atoms, an aminoalkyl group having 1 to 10 carbon atoms, a hydroxyalkyl group having 1 to 10 carbon atoms, A cycloalkyl group having 3 to 15 carbon atoms, an aryl group having 6 to 12 carbon atoms, an aralkyl group having 7 to 20 carbon atoms, and an alkenyl group having 2 to 20 carbon atoms, and a is an integer of 1 to 500. At least one of R ¹ , R ² and R ³ may not be hydrogen.

For example, the silicone resin may be a polyimide siloxane having both terminals capped with a vinyl group, a polydiethylsiloxane having both terminals capped with a vinyl group, a polydipropylsiloxane having both terminals capped with a vinyl group, and a polydimethylsiloxane having both terminals capped with a vinyl group And at least one selected from the group consisting of polydibutylsiloxane.

The crosslinking agent may be contained in an amount of 0.1 to 15 parts by weight per 100 parts by weight of the silicone resin, and more preferably 8 to 12 parts by weight per 100 parts by weight of the silicone resin. If the amount of the crosslinking agent is less than 0.1 parts by weight per 100 parts by weight of the silicone resin, crosslinking and curing of the composite may be difficult. If the amount exceeds 15 parts by weight, the mechanical properties of the composite may be deteriorated.

The polyhydrogensiloxane crosslinking agent that can be used in the present invention is preferably a crosslinking agent having a structure represented by the following formula (2) containing two or more unsubstituted hydrogen atoms.

(2)

R ⁴ ₃ SiO (R ⁵ ₂ SiO) _b SiR ⁶ ₃

Wherein R ⁴ , R ⁵ and R ⁶ are independently selected from the group consisting of hydrogen, linear or branched alkyl having 1 to 10 carbon atoms, aminoalkyl having 1 to 10 carbon atoms, hydroxyalkyl having 1 to 10 carbon atoms, halo having 1 to 20 carbon atoms alkyl group, having from 3 to 15 and a cycloalkyl group, an aralkyl group having 6 to 12 carbon atoms, an aryl group, having 7 to 20, and at least one selected from the group consisting of a-alkenyl having 2 to 20, R ^4, R ⁵ and R at least two or more of the unsubstituted ⁶ is hydrogen, wherein b is an integer of 1 or the five.

The polyhydrogensiloxane-based crosslinking agent may be, for example, dimethyl-methylhydrogensiloxane capped at both terminals with a methyl group, dimethyid-ethylhydrogensiloxane capped at both terminals with a methyl group, diethyl Methylhydrogensiloxane, diethyl-ethylhydrogen siloxane having both terminals capped with a methyl group, and dimethyl-propylhydrogensiloxane capped with a methyl group at both terminals.

In the present invention, the alkyl group is selected from the group consisting of methyl, ethyl, n-propyl, isopropyl, n-butyl, isobutyl, tertiary butyl, n-pentyl, isopentyl, neopentyl, hexyl, heptyl, Can be selected; The aminoalkyl group may be selected from the group consisting of methylamino group, dimethylamino group, ethylamino group, diethylamino group, dipropylamino group, dibutylamino group and the like; The hydroxyalkyl group may be selected from the group consisting of hydroxymethyl, hydroxyethyl, hydroxypropyl and the like; Examples of the haloalkyl group include a fluoroalkyl group such as trifluoropropyl, heptafluoropentyl, heptafluoroisopentyl, tridecafluorooctyl, heptadecafluorodecyl and the like and a chloroalkyl group such as chloromethyl, chloroethyl, ≪ / RTI > The cycloalkyl group is preferably a cyclopropyl group, a cyclobutyl group, a cyclopentyl group, a cyclohexyl group, a cycloheptyl group, a cyclooctyl group, a cyclononyl group, a cyclodecyl group, a cyclododecyl group, a cyclododecyl group, a butylcyclopropyl group, a methylcyclopentyl group, a dimethylcyclohexyl group, Heptyl, dimethylcyclooctyl, and the like; The aryl group may be selected from the group consisting of a phenyl group, a tolyl group, a xylyl group, a naphthyl group and the like; The arylalkyl group may be selected from the group consisting of a methylphenyl group, an ethylphenyl group, a methylnaphthyl group, a dimethylnaphthyl group and the like; The alkenyl group may be selected from the group consisting of a vinyl group, a propynyl group, a butanyl group, a pentanyl group, a hexynyl group, an octynyl group, a decynyl group, a hexadecynyl group, and an octadecynyl group.

When the cross-linking agent is a polyhydrogensiloxane-based cross-linking agent, the fine powder is preferably selected from platinum, platinum black, chloroplatinic acid, alcohol-modified chloroplatinic acid, chloroplatinic acid-olefin complex, chloroplatinic acid-alkenylsiloxane complex, and chloroplatinic acid-divinyltetramethyldi Siloxane complexes, the catalyst may further comprise at least one catalyst selected from the group consisting of crosslinking and curing reactions by reaction of aliphatic unsaturated bonds (vinyl groups) with hydrogen atoms bonded to silicon atoms And the rate of crosslinking and curing reaction can be controlled through the amount of catalyst.

The catalyst is preferably contained in an amount of 0.0001 to 1 part by weight per 100 parts by weight of the silicone resin.

The organic peroxide-based cross-linking agent may be a peroxide-based cross-linking agent, an acyl-based cross-linking agent, or a mixture thereof, and examples thereof include 2,5-dimethyl- At least one crosslinking agent selected from the group consisting of oxides, diacetyl peroxides, propanoyl peroxides and benzoyl peroxides.

Further, inorganic fillers such as calcium carbonate, silica, and magnesium carbonate may be further added to enhance the mechanical strength of the composite.

The inorganic filler is preferably contained in an amount of 5 to 15 parts by weight based on 100 parts by weight of the silicone resin.

The filler is preferably contained in an amount of 75 to 100 wt% based on the weight of the heat-radiating sheet. When the filler is contained in an amount of less than 75 wt% based on the weight of the heat-radiating sheet, sufficient heat- There is a difficult problem.

When the filler is only iron oxide, it is preferable that the iron oxide is contained in an amount of 75 to 90 wt%, preferably 80 to 85 wt% based on the total weight of the filler and the mattress resin composite, When it is less than 75 wt%, it is difficult to form a network of iron oxides in the polymer resin of the mattress, so that the thermal conductivity may not be effective. When it exceeds 80 wt%, it is difficult to form the heat-radiating sheet.

Meanwhile, the iron oxide may be dispersant-treated iron oxide treated with 0.5 to 10 wt% of a dispersant based on the weight of iron oxide. The dispersing agent enhances the degree of dispersion of the iron oxide in the silicone resin and improves the thermal conductivity of the heat-radiating sheet. If the content of the dispersing agent is less than 0.5 wt%, the advantageous effect obtained by the dispersing agent may be insufficient , And when it exceeds 10 wt%, the dispersant reacts with the crosslinking agent in the composite, and thus the process of crosslinking and curing the composite is not smoothly performed.

The dispersant is at least one selected from the group consisting of 2- (3,4-epoxycyclohexyl) ethyltrimethoxysilane, 3-glycidoxypropyltrimethoxysilane, vinyltrimethoxysilane and vinyltriethoxysilane .

The wetting method is a method in which a filler is pre-treated in a solvent such as water or ethanol to coat the surface of the iron oxide with a dispersant, and the drying method is a method of applying a filler In the present invention, the dispersing agent treatment is carried out using a wet method in order to perform a process of crosslinking and curing a smooth composite. The method of mixing the filler and the polymer resin is not particularly limited, Can be performed.

The amount of the iron oxide treated with the dispersant is preferably in the range of 75 to 85 wt% with respect to the total weight of the composite. When the content of the iron oxide treated with the dispersant is less than 75 wt%, it is difficult to form a network of iron oxide in the mattress polymer resin, And if it exceeds 85 wt%, it is difficult to form the heat-radiating sheet.

When the iron oxide is used as a filler after being treated with a dispersant, a heat-radiating sheet having a higher thermal conductivity than the case of applying iron oxide not subjected to a dispersant can be obtained.

Further, the filler may further comprise 20 to 40 wt%, preferably 25 to 35 wt% carbon material based on the weight of the filler, wherein the carbon material is at least one selected from the group consisting of carbon fiber and graphite It can be all day.

The carbon fiber serves as a support for supporting iron oxide which has a high specific gravity when forming the composite, and contributes to the improvement of the dispersibility of iron oxide and at the same time contributes to the network formation of fillers. The carbon fibers are preferably contained in an amount of 5 to 20 wt% based on the weight of the heat-radiating sheet. If the carbon fibers are less than 5 wt%, problems may arise in dispersibility and network formation of the fillers in the composite, There is a problem in that the process of crosslinking and curing the composite becomes difficult.

On the other hand, graphite can serve to improve the thermal conductivity in the horizontal direction. The graphite is preferably contained in an amount of 1 to 5 parts by weight per 1 part by weight of carbon fiber in powder form having an average particle size of 3 to 150 mu m. Prize

When the content of the filler of the present invention is 85 wt% or more based on the heat-radiating sheet, the content of carbon fibers in the carbon material is preferably 20 wt% or less in order to perform a crosslinking and curing process of a smooth composite.

If the average particle size of the graphite is less than 3 [mu] m or more than 150 [mu] m, it may be difficult to form a network in the composite, and the heat dissipation performance is reduced.

Further, according to another aspect of the present invention, there is provided a method for manufacturing a heat radiation sheet of the present invention.

In the method of manufacturing the heat-radiating sheet of the present invention, the composition including the components, content, and the like of the heat-generating sheet is as described in connection with the heat-radiating sheet.

More specifically, the method for producing a heat-radiating sheet of the present invention comprises the steps of mixing at least one crosslinking agent selected from the group consisting of iron oxide, silicone resin, polyhydrogensiloxane-based resin and organic peroxide-based crosslinking agent to form a composite; And crosslinking and curing the composite.

The step of forming the composite may be performed by mixing at a temperature of 70 DEG C or less, preferably at room temperature, for 20 to 30 minutes at a screw rotation speed of 80 to 120 rpm. Cross-linking and curing may occur during the formation of the composite at temperatures above 70 ° C.

On the other hand, the step of crosslinking and curing the composite may be performed by thermocompression, for example, by applying a pressure of 2000 to 2500 psi for 10 to 20 minutes at a temperature of 100 to 170 ° C.

Meanwhile, when the iron oxide is used as a filler after the dispersant treatment, the step of forming the complex may include mixing alcohol, water, and a dispersant to obtain a mixture; Further mixing iron oxide with the mixture; And at least one crosslinking agent selected from the group consisting of polyhydrogensiloxane-based and organic peroxide-based crosslinking agents, and a silicone resin.

At this time, the alcohol may be methanol, ethanol, butanol or ethylene glycol, but is not limited thereto.

The alcohol and water are preferably mixed with 15 to 25 parts by weight of alcohol per 1 part by weight of water. When the alcohol is less than the above range, gelation occurs due to a rapid reaction between the dispersing agents, There is a problem that it is not treated. When the amount exceeds the above range, the hydrolysis process is not performed well during the silanization process.

When the filler further comprises a carbonaceous material, the step of forming the composite comprises mixing at least one cross-linking agent selected from the group consisting of iron oxide, graphite, silicone resin and polyhydrogensiloxane-based and organic peroxide based cross-linking agent ; And further mixing the carbon fibers.

In this case, when the carbon fibers are inserted before the silicone resin, a volume expansion occurs in a mixing process using a mixer such as a closed type mixer, and a large pressure is applied to the inside of the mixer.

Hereinafter, the present invention will be described more specifically by way of specific examples. The following examples are provided to aid understanding of the present invention, and the scope of the present invention is not limited thereto.

Example

Manufacturing example  1: iron oxide powder As filler  Used heat-radiating sheet

112.74 g of iron oxide powder (about 75 wt% based on the total amount of the composite) was put into an airtight mixer, and then 37.6 g of silicone resin was added thereto.

The silicone resin used in this experiment was capped at both ends with a vinyl group and the side chain was methyl group (Polydimethylsiloxane, vinyldimethylsiloxy-terminated).

The iron oxide powder and the silicone resin were mixed at room temperature for 20 minutes at a screw rotation speed of 100 rpm to form a composite body. The composite body was placed in a stainless steel mold, and heated at 150 ° C. for 10 minutes under a pressure of 4600 psi The composite was crosslinked and cured by compression.

In the same manner as above, composites were prepared when the iron oxide powders were 80 wt%, 85 wt% and 90 wt%, respectively, as compared with the total composite. The content of each of the prepared examples is as shown in Table 1 below. The prepared specimens were measured for thermal conductivity using QTM-500 manufactured by KEM (Kyoto Electronics Manufacturing), and the results are shown in Table 1 below.

Comparative Example 1 Example 1 Example 2 Example 3 Example 4 Iron oxide powder (filler) 0 wt% 75 wt% 80 wt% 85 wt% 90 wt% Silicone resin 100 wt% 25 wt% 20 wt% 15 wt% 10 wt% Thermal conductivity (W / mK) 0.270 0.804 0.824 1.350 1.405

Manufacturing example  2: Dispersant treated iron oxide As filler  Used heat-radiating sheet

Dispersant treatment through the wet method of iron oxide was carried out by the following process. 122.55 g of methanol, 6.45 g of water and 8.5 g of a dispersant are charged into a reactor and reacted at a stirrer speed of 300 rpm at room temperature for 3 hours. This is because the -OR functional group of the dispersant is transformed into the -OH functional group through the above reaction due to the hydration reaction which activates the dispersant. The dispersant used herein was 2- (3,4-epoxycyclohexyl) ethyltrimethoxysilane, 3-glycidoxypropyltrimethoxysilane, vinyltrimethoxysilane or vinyltriethoxysilane.

Then, 170 g of iron oxide was added to the above reactor, and the reaction was carried out at 80 ° C. and 300 rpm at a stirrer speed for 2 hours and 30 minutes. When the above reaction proceeds, sludge is formed. The sludge is vacuum-filtered by a vacuum pump to remove the solvent (ethanol) and unreacted dispersant, and the iron oxide treated with the dispersant can be obtained. After filtering with Buchner funnel, Buchner flask, vacuum pump and filter paper, it is dried at 60 ° C for 24 hours to obtain dispersant-treated iron oxide.

133.78 g of dispersed iron oxide powder (80 wt% with respect to the total composite) was put into an airtight mixer, followed by the addition of 33.4 g of silicone resin. At this time, the silicone resin was a polydimethylsiloxane having both terminals capped with a vinyl group and a side chain composed of a methyl group.

The dispersed iron oxide powder and the silicone resin were mixed at room temperature and at a screw rotation speed of 100 rpm for 20 minutes to form a composite body. The composite body was placed in a stainless steel mold, and the mixture was heated at 150 DEG C for 10 minutes under a pressure of 4600 psi The composite was crosslinked and cured by thermocompression.

The content of each of the prepared examples is as summarized in Table 2 below. The prepared specimens were measured for thermal conductivity using QTM-500 of KEM (Kyoto Electronics Manufacturing), and the results are shown in Table 2 below.

Iron oxide powder (filler) Dispersant type Thermal conductivity (W / mK) Example 5 80 wt% 3-glycidoxypropyltrimethoxysilane 0.909 Example 6 80 wt% 2- (3,4-epoxycyclohexyl) ethyltrimethoxysilane 0.946 Example 7 80 wt% Vinyltrimethoxysilane 0.964 Example 8 80 wt% Vinyltriethoxysilane 0.962

Manufacturing example  3: Composite iron oxide powder and carbon material As filler  Used heat-radiating sheet

After injecting 62.2 g of iron oxide (50 wt% of the composite) and 15.55 g of graphite powder of 75 μm size (12.5 wt% of the composite) into a closed mixer, 31.1 g of silicone resin was added and then finely minced to 6 mm 15.55 g of carbon fiber (12.5 wt% based on the total composite) was added. At this time, the silicone resin was a polydimethylsiloxane silicone resin having both terminals capped with a vinyl group and a side chain comprising a methyl group.

The iron oxide powder and the silicone resin The mixture was mixed at room temperature with a screw speed of 100 rpm for 20 minutes to form a composite. The composite was placed in a stainless steel mold and thermocompressed at 150 ° C. for 10 minutes under a pressure of 4600 psi. Crosslinked and cured.

Furthermore, specimens were prepared by fixing the iron oxide content to 50 wt% based on the weight of the filler, varying the content of the filler in the composite, and the weight ratio of carbon fiber and graphite. The composition of each of the prepared examples is as summarized in Table 3 below. The prepared specimens were measured for thermal conductivity using QTM-500 of KEM (Kyoto Electronics Manufacturing), and the results are shown in Table 3 below.

Filler content (% by weight) Carbon fiber: graphite
(Weight ratio) Thermal conductivity
(W / mK) All fillers Iron oxide Carbon fiber black smoke Example 9 75 50 12.5 12.5 1: 1 1.285 Example 10 80 50 15.0 15.0 1: 1 1.745 Example 11 80 50 10.0 20.0 1: 2 2.360 Example 12 80 50 7.5 22.5 1: 3 2.733 Example 13 80 50 5.0 25.0 1: 5 2.886 Example 14 85 50 17.5 17.5 1: 1 4.162

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, It will be obvious to those of ordinary skill in the art.

Claims (20)

A filler including iron oxide; Silicone resin; And a mattress comprising at least one crosslinking agent selected from the group consisting of polyhydrogensiloxane-based and organic peroxide-based crosslinking agents.
The heat-radiating sheet according to claim 1, wherein the silicone resin is a resin including polydiorganosiloxane having both terminals capped with a vinyl group.
The heat-radiating sheet according to claim 1, wherein the silicone resin is a silicone resin having a structure represented by the following formula (1).

[Chemical Formula 1]
CH ₂ CHR ¹ ₂ SiO (R ² ₂ SiO) _a SiR ³ ₂ CHCH ₂
Wherein R ¹ , R ² and R ³ are each independently selected from the group consisting of hydrogen, a linear or branched alkyl group having 1 to 10 carbon atoms, an aminoalkyl group having 1 to 10 carbon atoms, a hydroxyalkyl group having 1 to 10 carbon atoms, A cycloalkyl group having 3 to 15 carbon atoms, an aryl group having 6 to 12 carbon atoms, an aralkyl group having 7 to 20 carbon atoms, and an alkenyl group having 2 to 20 carbon atoms, and at least ^{one of} R ¹ , R ² and R ³ One is not hydrogen, and a is an integer from 1 to 500.)
The silicone resin according to claim 1, wherein the silicone resin is at least one selected from the group consisting of a polydimethylsiloxane capped at both terminals with a vinyl group, a polydiethylsiloxane capped at both terminals with a vinyl group, a polydipropylsiloxane capped at both terminals with a vinyl group, And at least one member selected from the group consisting of polyphenylsiloxane, polyphenylsiloxane, and cross-capped polydibutylsiloxane.
The heat-radiating sheet according to claim 1, wherein the cross-linking agent is contained in an amount of 8 to 12 parts by weight per 100 parts by weight of the silicone resin.
The heat-radiating sheet according to claim 1, wherein the polyhydrogensiloxane-based crosslinking agent is a fusing agent containing a structure represented by the following formula (2) containing two or more unsubstituted hydrogen atoms.

(2)
R ⁴ ₃ SiO (R ⁵ ₂ SiO) _b SiR ⁶ ₃
(Wherein R ⁴ , R ⁵ and R ⁶ are each independently selected from the group consisting of hydrogen, a linear or branched alkyl group having 1 to 10 carbon atoms, an aminoalkyl group having 1 to 10 carbon atoms, a hydroxyalkyl group having 1 to 10 carbon atoms, a haloalkyl group, a C 3 -C 15 cycloalkyl group, an aralkyl group of the aryl group having 6 to 12 carbon atoms, having a carbon number of 7-20, and at least one selected from the group consisting of a-alkenyl having 2 to 20, R ^4, R ^5, and At least two of R < ⁶ > are unsubstituted hydrogen, and b is an integer of 1 to 5. [
The polyhydrogensiloxane cross-linking agent according to claim 6, wherein the polyhydrogensiloxane-based cross-linking agent is selected from the group consisting of dimethyl-methylhydrogensiloxane capped at both terminals with a methyl group, dimethadyl-ethylhydrogensiloxane capped at both terminals with a methyl group, Wherein the heat-resistant sheet is at least one selected from the group consisting of diethyl-methylhydrogensiloxane, diethyl-ethylhydrogensiloxane capped at both ends with a methyl group, and dimethyl-propylhydrogensiloxane capped at both ends with a methyl group, .
The method according to claim 1, wherein when the cross-linking agent is a polyhydrogensiloxane-based cross-linking agent, fine-powder platinum, platinum black, chloroplatinic acid, alcohol-modified chloroplatinic acid, chloroplatinic acid-olefin complex, chloroplatinic acid-alkenylsiloxane complex, -Divinyltetramethyldisiloxane complex. ≪ RTI ID = 0.0 > 11. < / RTI >
The heat-radiating sheet according to claim 8, wherein the catalyst is contained in an amount of 0.0001 to 1 part by weight per 100 parts by weight of the silicone resin.
The organic peroxide crosslinking agent according to claim 1, wherein the organic peroxide crosslinking agent is 2,5-dimethyl-2,5-t-butyl hexane peroxide, 2,4-dichlorobenzoyl peroxide, diacetyl peroxide, propanoyl peroxide, Wherein the heat-radiating sheet is at least one crosslinking agent selected from the group consisting of peroxides.
The heat-radiating sheet according to claim 1, wherein the filler is contained in an amount of 75 to 100 wt% based on the weight of the heat-radiating sheet.
The heat-radiating sheet according to claim 1, wherein the iron oxide is dispersant-treated iron oxide treated with 0.5 to 10 wt% of a dispersing agent based on the weight of iron oxide.
The method of claim 12, wherein the dispersant is selected from the group consisting of 2- (3,4-epoxycyclohexyl) ethyltrimethoxysilane, 3-glycidoxypropyltrimethoxysilane, vinyltrimethoxysilane and vinyltriethoxysilane. Heat-radiating sheet.
The heat-radiating sheet according to claim 1, wherein the filler further comprises 20 to 40 wt% carbon material based on the weight of the filler.
15. The heat-radiating sheet according to claim 14, wherein the carbon material is at least one selected from the group consisting of carbon fiber and graphite.
16. The heat-radiating sheet according to claim 15, wherein the carbon fibers are contained in an amount of 5 to 20 wt% based on the weight of the heat-radiating sheet.
16. The heat-radiating sheet according to claim 15, wherein the graphite is contained in an amount of 1 to 5 parts by weight per 1 part by weight of carbon fiber in powder form having an average particle size of 3 to 150 mu m.
Mixing at least one crosslinking agent selected from the group consisting of iron oxide, silicone resin, and polyhydrogensiloxane-based and organic peroxide-based crosslinking agent to form a composite; And
Crosslinking and curing the composite
Wherein the heat-radiating sheet is made of a thermosetting resin.
19. The method of claim 18, wherein forming the composite comprises:
Mixing the alcohol, water and dispersant to obtain a mixture;
Further mixing iron oxide with the mixture; And
A polyhydrogensiloxane-based resin, and an organic peroxide-based cross-linking agent; and a step of mixing the silicone resin with at least one crosslinking agent selected from the group consisting of a polyhydrogensiloxane-based resin and an organic peroxide-based crosslinking agent.
19. The method of claim 18, wherein forming the composite comprises:
Mixing at least one crosslinking agent selected from the group consisting of iron oxide, graphite, silicone resin, and polyhydrogensiloxane-based and organic peroxide-based crosslinking agent; And
Further mixing of the carbon fibers
Wherein the heat-radiating sheet is made of a thermosetting resin.