KR101410058B1 - Environment friendly heat-dissipating resin composition having excellent heat-dissipating property and steel sheet using the same - Google Patents

Abstract

Disclosed is a heat radiation resin composition which has excellent heat radiation property, electrical conductivity and corrosion resistance and does not contain a volatile organic compound, a surface treatment method of a zinc coated steel sheet using the above heat radiation resin composition, and a galvanized steel sheet using the above heat radiation resin composition.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a heat-dissipating resin composition having excellent heat dissipation properties, and a steel sheet using the same. BACKGROUND ART < RTI ID = 0.0 >

And an environmentally friendly heat radiation resin composition having excellent heat radiation characteristics. More specifically, the present invention relates to a heat radiation resin composition which has excellent heat radiation property, electric conductivity and corrosion resistance and does not contain a volatile organic compound, a surface treatment method of a galvanized steel sheet using the above heat radiation resin composition and a heat radiation galvanized steel sheet .

From the viewpoint of preventing global warming caused by carbon gas, energy saving of all equipment, whether industrial or life management, is progressing. As one example, attempts have been made to extend the service life of electric components by reducing power consumption by improving heat exchange efficiency. Particularly, as the size of the refrigerator is increased and the operation speed of the personal computer is improved, the amount of heat generated from the compressor and the CPU (central processing unit) tends to increase, and it is required to rapidly dissipate the heat generated from the inside to the outside.

When the internal temperature of the device rises, there arises a problem that the malfunction of the semiconductor device, the change of the characteristics of the resistor component, and the service life of the component are lowered. In order to solve such a problem, attempts have been made to impart heat dissipation characteristics to the steel sheet.

For example, a technology has been proposed in which a heat ray or a heat radiation property is imparted to a steel sheet by mixing a pigment having excellent heat emissivity in an infrared wavelength region such as carbon black or titania with a polymer resin to form a coating film on the steel sheet. However, A large amount of pigments must be contained in order to obtain the endothermic or heat radiation characteristics, and thus the thickness of the film must be increased, resulting in an increase in manufacturing cost and an increase in electrical resistance. In order to prevent electromagnetic waves generated from electronic devices, electromagnetic shielding property, that is, electrostatic earth property with a low resistance value is required, and therefore, excellent electrical conductivity of the surface of the steel sheet is required.

Further, in order to produce a steel sheet having a surface electric conductivity and an electromagnetic wave shielding property, there has been proposed a technique of manufacturing a heat-releasing steel sheet by coating with a resin composition containing a metal. However, The volatile organic compound is released, and the thickness of the coating film is increased to 20 to 30 占 퐉.

There is still a problem and a limit that causes an increase in energy consumption because the restriction of the lowering environment is intensified due to the increase in the awareness of the importance of the environment and a separate equipment for reducing the volatile organic compounds is required according to the amount of volatile organic compounds .

On the other hand, since the LED backlight is replacing CCFL backlight such as LCD TV due to the recent spread of LED, the demand for heat dissipation characteristic of steel sheet is increasing. In the case of an LED, light is emitted when a current flows, but portions that can not be converted into light energy are emitted together with heat energy. If heat above this specific temperature is generated, there is a problem that the lifetime of the LED drastically deteriorates. For this reason, excellent heat radiation characteristics are required for the steel sheet, and conventional heat radiation resin compositions have a limited heat radiation effect on the LED's.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems and it is an object of the present invention to provide a heat dissipation resin composition which has excellent heat dissipation properties, electrical conductivity and corrosion resistance and does not contain volatile organic compounds, a surface treatment method of a galvanized steel sheet using the heat dissipation resin composition, To provide a heat-radiating galvanized steel sheet produced by the method.

According to one aspect,

30 to 90 parts by weight of at least one water-soluble resin selected from the group consisting of a urethane resin, an acrylic resin, an epoxy resin, an ester resin and an olefin resin, based on 100 parts by weight of the heat radiation resin composition;

3 to 20 parts by weight of at least one pigment selected from the group consisting of graphite, carbon nanotubes, carbon black, aluminum oxide, zinc oxide, indium tin oxide, aluminum zinc oxide, titanium oxide, boride and nitride;

0.1 to 20 parts by weight of at least one additive selected from the group consisting of organic phosphoric acid compounds, phosphoric acid compounds, organic titanium compounds, vanadium compounds, organic silane compounds, silica compounds, waxes and amine compounds; And

A heat radiation resin composition comprising a residual amount of a solvent is disclosed.

According to another aspect,

Applying the heat radiation resin composition to a galvanized steel sheet; And

A method for surface treatment of a galvanized steel sheet comprising the step of forming a heat radiation resin coating layer by drying a heat radiation resin composition applied to a galvanized steel sheet.

According to another aspect,

A heat-radiating galvanized steel sheet produced by the above method is disclosed.

The heat-radiating galvanized steel sheet produced according to the above method is environment-friendly because it does not contain a volatile organic compound, and is remarkably excellent in heat radiation property, electrical conductivity and corrosion resistance.

1 shows an apparatus for evaluating a heat radiation characteristic used in an embodiment according to the present invention.
2 is a graph showing the measurement of the heat dissipation characteristics of the galvanized steel sheet used in the embodiment of the present invention.
3 is a graph showing a measurement result of heat dissipation characteristics of a heat-radiating galvanized steel sheet according to Example 15 of the present invention.
4 is a graph showing the measurement of the heat radiation characteristics of the steel sheet according to Comparative Example 3. Fig.

Unless defined otherwise herein, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art. Various scientific dictionaries, including the terms contained herein, are well known and available in the art. Although any methods and materials similar or equivalent to those described herein are found to be used in the practice or testing of the present application, some methods and materials have been described. Should not be construed as limiting the invention to the particular methodology, protocols, and reagents, as they may be used in various ways in accordance with the context in which those skilled in the art use them.

As used herein, the singular forms include plural objects unless the context clearly dictates otherwise. As used herein, unless otherwise stated, "or" means "and / or ". Furthermore, it is to be understood that other forms, such as " having ", "consisting ", and" consisting "

The numerical range includes numerical values defined in the above range. All maximum numerical limitations given throughout this specification include all lower numerical limitations as well as the lower numerical limitations being explicitly stated. All minimum numerical limitations given throughout this specification include all higher numerical limitations as the higher numerical limitations are explicitly stated. All numerical limitations given throughout this specification will include any better numerical range within a broader numerical range, as narrower numerical limitations are explicitly stated.

The subject matter provided herein should not be construed as limiting the following embodiments in various aspects or as a reference throughout the specification.

According to one embodiment, there is provided an environmentally friendly aqueous heat radiation resin composition (hereinafter referred to as "heat radiation resin composition") having excellent heat radiation characteristics. The heat radiation resin composition may include a water-soluble resin, a pigment, an additive and a residual solvent.

As used herein, the term "heat radiation characteristic" means a degree of heat radiation effect from a high temperature to a low temperature when the coated steel sheet, the coated steel sheet, or the coated steel sheet is assembled into a main body such as a home appliance.

In this embodiment, the water-soluble resin may be selected from the group consisting of a urethane resin, an acrylic resin, an epoxy resin, an ester resin, an olefin resin and a mixture thereof.

The urethane-based resin is preferably a self-crosslinking polyurethane dispersion resin such as diethylene glycol dimethacrylate, triethylene glycol dimethacrylate, trimethylolpropane triacrylate, tripropylene glycol diacrylate, penta But are not limited to, trimethylolpropane triacrylate, trimethylolpropane trimethacrylate, trimethylolpropane trimethacrylate, trimethylolpropane triacrylate, trimethylolpropane trimethacrylate, trimethylolpropane triacrylate, trimethylolpropane triacrylate, The molecular weight of the urethane-based resin may be 5,000 to 2,000,000. When the molecular weight of the urethane-based resin is less than 5,000, the processability may be deteriorated. When the molecular weight exceeds 2,000,000, the stability of the solution may decrease, and the viscosity of the heat-radiation resin composition may increase.

(Meth) acrylate, isobutyl (meth) acrylate, isopropyl (meth) acrylate, n-butyl (meth) acrylate, But are not limited to, acrylate, hydroxypropyl (meth) acrylate, stearyl (meth) acrylate, and hydroxybutyl (meth) acrylate. The molecular weight of the acrylic resin may be 50,000 to 2,000,000. If the molecular weight of the acrylic resin is less than 50,000, the processability may deteriorate. If 2,000,000 is exceeded, the stability of the solution may decrease, and the viscosity of the heat radiation resin composition may increase.

The epoxy resin may include a bisphenol A type resin, a bisphenol F type resin, a novolak resin, and the like, but is not limited thereto. The molecular weight of the epoxy resin may be 500 to 25,000. If the molecular weight of the epoxy resin is less than 500, the crosslinking density may be increased and the workability may be deteriorated. If the molecular weight exceeds 25,000, the epoxy resin may be difficult to be water-soluble and the crosslinking density may be decreased.

Wherein the ester resin is a polyester resin and an ethylene glycol-modified ester resin, a propylene glycol-modified ester resin, and a polyester resin produced from maleic anhydride, isophthalic acid, terephthalic acid, tetrahydrophthalic anhydride, methyltetrahydrophthalic anhydride, adipic acid, Neopentyl glycol modified ester resins, and the like, but are not limited thereto. The molecular weight of the ester-based resin may be 5,000 to 15,000. If the molecular weight of the ester-based resin is less than 5,000, the workability may be lowered due to the increase of the work density, and if it exceeds 15,000, the price may increase and the corrosion resistance may be lowered.

The olefin-based resin may include, but is not limited to, polyethylene, a vinyl-modified polyethylene resin, a polyvinylbutylene resin, a vinyl chloride copolymer resin, a vinyl acetate copolymer resin, and a polyvinyl alcohol resin. The molecular weight of the olefin resin may range from 500,000 to 2,000,000. If the molecular weight of the olefin resin is less than 500,000, the crosslinking density may be increased and the processability may be deteriorated. When the molecular weight exceeds 2,000,000, the olefin resin may be difficult to be water-soluble, the resin may precipitate, and the abrasion resistance may be deteriorated.

The water-soluble resin may be blended in an amount of 30 to 90 parts by weight, or 50 to 80 parts by weight based on 100 parts by weight of the heat radiation resin composition.

In one embodiment, a self-crosslinking polyurethane disperse resin and at least one resin selected from the group consisting of urethane resin, acrylic resin, epoxy resin, ester resin and olefin resin are mixed and used .

In the case of a water-dispersed polyurethane resin generally used, although slight self-crosslinking can be achieved by heating, there is a problem that the corrosion resistance and the solvent resistance of the resin coating deteriorate because crosslinking is insufficient. In order to solve the above problems, hardeners such as epoxy compounds, amines, polyhydric alcohols, polybasic acids, and isocyanates have been used. However, when such a hardener is used, storage stability is lowered, Since the reaction must be carried out at the reaction temperature, it is not suitable for the resin for the surface-treated steel sheet which is carried out at a baking time of 30 seconds or less.

Accordingly, the present inventors have found that by using a self-crosslinking synthetic polyurethane dispersant resin synthesized using a polyfunctional acrylic monomer instead of a conventional inorganic substance, the chemical crosslinking density of the water-dispersed polyurethane resin is increased, So that bonding can be performed.

In the above embodiment, the pigment is not particularly limited as long as it has a heat radiation property. For example, the pigment may include graphite, carbon nanotubes, carbon black, aluminum oxide, zinc oxide, indium tin oxide, aluminum zinc oxide, aluminum oxide, nano titanium oxide, boride, But is not limited thereto.

The pigment may be blended in an amount of 3 to 20 parts by weight, or 5 to 12 parts by weight based on 100 parts by weight of the heat radiation resin composition. When the amount of the pigment is less than 1 part by weight, it is difficult to obtain the heat radiation property, and when it exceeds 20 parts by weight, the stability of the solution is decreased and the corrosion resistance may be lowered.

The pigment may have an average particle diameter of 10 mu m or less, or nanometer (nm) size. If the average particle diameter of the pigment exceeds 10 탆, the physical properties of the resin coating film may be deteriorated.

In this embodiment, the additive may be selected from the group consisting of an organic phosphoric acid compound, a phosphoric acid compound, an organic phosphoric acid compound, an organic titanium compound, a vanadium compound, an organosilane compound, a silica compound, a wax, an amine compound and a mixture thereof.

For example, the organic phosphoric acid compound and the phosphoric acid compound may be at least one member selected from the group consisting of 1-hydroxyethylene-1,1-diphosphonic acid, ammonium phosphate, sodium monophosphate, sodium diphosphate, sodium triphosphate, But is not limited thereto. The organic titanium compound may be selected from the group consisting of tetraethyl titanate, tetraisopropyl titanate, titanium acetylacetonate and polybutyl titanate, but is not limited thereto. The vanadium compound may be at least one selected from the group consisting of ammonium vanadate and vanadium acetylacetonate, but is not limited thereto. The organosilane compound and the silica compound are preferably selected from the group consisting of gamma-glycidoxypropyltrimethoxysilane, beta - (3,4-epoxycyclohexyl) ethyltrimethoxysilane, 3-methacryloxypropyltrimethoxysilane, 3- Propyltriethoxysilane, propyltriepoxysilane, colloidal silica, and lithium polysilicate. However, the present invention is not limited thereto. The wax may be selected from the group consisting of polyethylene wax, teflon wax and polyolefin wax, but is not limited thereto. The amine compound may be selected from the group consisting of triethylamine and triethanolamine, but is not limited thereto.

The additive may be blended in an amount of 0.1 to 20 parts by weight, or 3 to 12 parts by weight based on 100 parts by weight of the heat radiation resin composition. Within the above range, the additive can improve functions such as corrosion resistance, solution stability, processability and viscosity of the heat radiation resin composition.

Alternatively, the heat radiation resin composition may further include a defoaming agent to remove bubbles in the heat radiation resin composition. The defoaming agent may be a silicone-based material. For example, the antifoaming agent may include, but is not limited to, dimethyl silicone, silicone, polydimethylsiloxane, polymethylsiloxane, fluorosilicon, and the like.

The defoaming agent may be blended in an amount of 0.2 parts by weight or less, or 0.1 parts by weight or less, based on 100 parts by weight of the heat radiation resin composition.

In this embodiment, the solvent is selected from the group consisting of pure water or organic solvents such as xylene, ethylene acetate, methyl acetate, cellosolve acetate, ethylacetate, butyl acetate, toluene, tetrahydrofuran, carbon disulfide, chloroform, trichlorethylene, n-hexane, dichloromethane, But are not limited to, methanol, ethanol, methylcyclohexanone, methylcyclohexanol, methylbutylketone, methylethylketone, methylisobutylketone, 1-butanol, 2-butanol, cyclohexanone, cyclohexanol, acetone, ethylene glycol monomethyl ether , Mineral spirits, cresols, benzene, chlorobenzene, xylene, tetrachlorethylene, tetrahydrofuran, ethyl ether, methyl alcohol, ethyl alcohol, propylene glycol monomethyl ether, ethylene glycol monobutyl ether, ethylene glycol monoethyl ether acetate, NN - dimethylformamide, ortho-dichlorobenzene, isopentyl alcohol, isopropyl alcohol and But it can be selected from the group consisting of a mixture of, and the like.

The viscosity of the heat radiation resin composition is controlled according to the content of the solvent, and the content of the solvent can be appropriately adjusted according to the viscosity desired by a person skilled in the art without any particular limitation. For example, it can be used in an amount such that it takes 10 to 30 seconds to drain from the Ford Cup # 4.

According to another embodiment, there is provided a surface treatment method of a galvanized steel sheet using the heat radiation resin composition. The method may include the step of applying the heat radiation resin composition to the galvanized steel sheet and the step of forming the heat radiation resin coating layer by drying the heat radiation resin composition applied to the galvanized steel sheet.

The galvanized steel sheet may be selected from electrogalvanized steel (EG), galvanizing steel (GI), galvannealed steel (GA), but is not limited thereto.

The heat radiation resin composition may be applied to one side or both sides of the galvanized steel sheet in an amount of 500 to 3,000 mg / m ² , or 800 to 2,500 mg / m ² . The application method is not particularly limited and can be suitably selected for facilitating the skilled artisan in the art. For example, the heat radiation resin composition can be applied to the galvanized steel sheet by a bar-coder method or a roll coater method.

The heat radiation resin composition coated on the galvanized steel sheet is capable of curing at a low temperature and can be dried at a PMT (Peak Metal Temperature) temperature. For example, at a temperature of from 150 to 190 占 폚, or from 170 to 180 占 폚.

The drying method may be suitably selected and carried out by a person having ordinary skill in the art without any particular limitation. For example, the heat radiation resin composition may be dried by a fanning method or an induction heating method.

According to another embodiment, there is provided a heat-radiating galvanized steel sheet produced using the heat-radiating resin composition.

As an example, a heat-radiating galvanized steel sheet can be produced by subjecting the above-mentioned heat radiation resin composition to 1,200 mg / m ² to an electro-galvanized steel sheet followed by drying at a PMT of 170 ° C.

The heat-radiating galvanized steel sheet produced according to this embodiment is environment-friendly because it does not contain volatile organic compounds, and is remarkably excellent in heat radiation, electrical conductivity and corrosion resistance.

Accordingly, the present invention is applicable to electronic appliances such as air conditioners, home appliances such as lighting apparatuses and refrigerators, OA appliances such as personal computers and photocopiers, AV appliances such as televisions and videos, automobile electric appliances, It is expected to be used.

Hereinafter, various embodiments are shown to facilitate understanding of the present invention. The following examples are provided only for the purpose of easier understanding of the present invention, and the scope of protection of the present invention is not limited to the following examples.

<Examples>

1. Zinc plated steel sheet

Electrogalvanized steel (EG) was used as the steel sheet with a thickness of 0.6 mm and a galvanized surface on both sides with a side coated amount of 20 g / m ² .

2. Preparation of Heat Resistant Resin Composition and Specimen

A resin composition, a pigment and an additive were blended in an amount shown in Table 1 below with respect to 100 parts by weight of the heat radiation resin composition. Here, the contents of the respective components shown in the following Table 1 indicate parts by weight unless otherwise specified. Then, the mixture was stirred for 10 minutes with a high-speed stirrer at a speed of about 800 rpm. Using pure water, the viscosity was adjusted to take about 11 seconds to drain from the Ford Cup (Ford Cup # 4, DIN 53211).

The heat-radiating resin composition was bar-coated on the galvanized steel sheet in an amount of about 1,200 mg / m ² , and dried at 170 ° C to produce a heat-radiating galvanized steel sheet.

(Thickness: 0.6 mm; coating layer: ester-based resin layer); Comparative Example 2: electric zinc plated steel sheet (thickness: 0.6 mm; coating layer: ester-based and melamine-based resin layer) In Example 3, an electro-galvanized steel sheet (thickness 0.6 mm, coating layer: olefin resin layer) of C company was used.

division Water-soluble resin Pigment additive Self-cementing synthetic polyurethane Dispersing / Acrylic-Polyurethane Dispersing Modified acrylic resin / acrylic emulsion resin Carbon nanotubes / graphite Aluminum Zinc Oxide / Titanium Oxide Organophosphorus compound / organic titanium compound Vanadium compound / silica compound Example 1 10/0 10/0 5/1 1/0 3/2 1/2 Example 2 20/0 10/0 5/1 1/0 3/2 1/2 Example 3 40/10 40/2 3/1 1/0 1/1 0/0 Example 4 30/20 30/10 3/1 1/1 1/1 1/0 Example 5 40/0 5/0 5/1 1/0 3/2 1/2 Example 6 40/0 10/0 5/1 1/0 3/2 1/2 Example 7 50/10 15/5 3/1 1/1 1/1 1/0 Example 8 50/10 20/5 3/1 1/1 1/1 1/0 Example 9 50/0 10/0 5/1 1/1 3/2 1/2 Example 10 50/10 10/0 5/1 1/1 2/1 0/2 Example 11 60/0 20/0 1/0 0/0 3/2 2/2 Example 12 50/10 20/0 1/0 1 / 0.5 3/2 2/2 Example 13 40/10 20/0 8/4 6/4 2/1 1/1 Example 14 40/10 20/0 7/4 7/4 2/1 1/1 Example 15 50/0 20/5 5/1 3/2 1/0 0/1 Example 16 50/0 20/5 5/1 3/2 5/2 1/3 Example 17 55/0 20/0 3/2 5/1 8/5 3/5 Example 18 70/0 5/0 5/1 3/1 3/2 1/2 Example 19 60/5 15/0 5/1 3/1 3/2 1/2

3. Property evaluation

1) Heat dissipation characteristics

The evaluation of the heat dissipation characteristics was carried out by making the test apparatus shown in Fig. The outside of the test apparatus of FIG. 1 was made of 10 mm transparent acrylic (100), the upper part was openable and closable, and a support 500 was installed inside the test coating steel sheet. In addition, the lower floor has a plurality of small holes to allow the expanded air to escape, and a leg (600) for supporting the device is installed on the bottom surface. The heating element serving as a heater uses a TV bar LED module 200 and a thermocouple 300 is fixed to a side of a metal PCB made of an aluminum alloy such that the temperature change of the LED module can be measured . The coated heat-radiating steel plate specimen (400) was fixed to the end of the specimen by fixing an LED module and a screw to transmit heat, and then the temperature of the LED module was measured. The size of the test apparatus was 160 x 200 x 60 mm.

The prepared galvanized heat-resisting steel sheet was made into a size of 145.times.175 mm and then screwed into an LED module and inserted into the apparatus. The temperature of the LED module was measured through a constant current of 195 mA for 40 minutes. The heat dissipation characteristics were evaluated by calculating the temperature difference (? T) of the LED portion after 40 minutes from the coated steel sheet to the EG steel sheet not subjected to the coating treatment. The LED temperature after 40 minutes of the untreated EG steel sheet was 84 占 폚.

FIG. 2 is a graph showing the temperature versus time of measuring the heat radiation characteristics of the untreated EG steel sheet. FIG. 3 is a graph showing the temperature of the EG steel sheet according to Example 15 versus time, FIG. 4 is a graph illustrating a temperature graph of the steel sheet manufactured in accordance with the present invention. 2 to 4, the uppermost red graph represents the temperature of the LED module.

2) Corrosion resistance

The plate corrosion resistance was evaluated by the method described in ASTM B117, and the corrosion resistance of the heat-resistant coated steel sheet was measured. The rating was evaluated according to the following criteria in terms of time until the occurrence of 5% white rust.

[Evaluation standard]

Excellent: Less than 5% of white rust occurrence area after 120 hours,

Good: Less than 5% of white rust occurrence area after 72 to 120 hours,

Insufficient: Less than 5% of white rust occurrence area after 48 to 72 hours,

Defective: after 48 hours, area of white rust occurrence 5% or more

The results are shown in Fig. 2 below.

3) Electrical conductivity

The surface electrical conductivity was measured by LORESTA GP (Mitsubishi KK) 4-seam method, and the 145x175 mm specimen was measured ten times and evaluated as the average value.

[Evaluation standard]

Excellent: Less than 0.1Ω, Good: Less than 1Ω, Bad: More than 1Ω

The results are shown in Table 2 below.

4) Solvent resistance

The thickness of the specimens was measured to be 75 x 150 mm, and then rubbed with a gauze soaked with methyl ethyl ketone to determine the number of times until the coating was peeled off when rubbed with a force of 1 Kgf.

[Evaluation standard]

Excellent: 20 times or more, Good: 10 to 20 times, Inadequate: 5 to 10 times, Defective: 5 times or less

The results are shown in Table 2 below.

5) Solution stability

After the heat-radiating resin composition prepared above was stored for 2 weeks in a constant-temperature apparatus at 50 ° C, the state of the composition such as viscosity increase, gelation and precipitation was observed and evaluated according to the following criteria.

[Evaluation standard]

Excellent: No change in composition such as viscosity increase, gelation and precipitation,

Good: only changes in viscosity of the composition within 5% were observed,

Bad: Up to 5% increase in viscosity of the composition, gelation, precipitation, and other changes occur.

The results are shown in Table 2 below.

6) Workability

In the process of controlling the thickness of the coating layer by varying the rotation direction, speed and pressure of each roll so as to have a uniform surface appearance by roll coating in the manufacturing line during the resin-coated steel sheet manufacturing process, evaluation is performed according to the degree of appearance of uniform surface appearance Respectively.

[Evaluation standard]

Good: No roll marks, Good: Fine roll marks available, Bad: Roll marks high

The results are shown in Table 2 below.

division Heat dissipation temperature
(ΔT, ° C.) Corrosion resistance Electrical conductivity Solvent resistance Solution stability Workability Example 1 5.2 Bad Great Bad Good Good Example 2 5.1 Bad Great Bad Good Good Example 3 4.5 Great Bad Great Great Great Example 4 4.8 Great Bad Great Great Great Example 5 5.6 Inadequate Great Inadequate Good Good Example 6 5.5 Good Great Inadequate Good Good Example 7 5.4 Great Great Great Great Good Example 8 5.5 Great Good Great Great Great Example 9 5.9 Good Great Good Good Good Example 10 5.8 Great Great Good Great Good Example 11 3.2 Great Bad Great Good Great Example 12 3.5 Great Good Great Good Great Example 13 6.8 Inadequate Great Bad Good Bad Example 14 6.7 Inadequate Great Bad Good Bad Example 15 6.2 Good Great Good Great Good Example 16 6.7 Great Great Good Good Good Example 17 6.5 Great Great Great Bad Good Example 18 6.6 Great Great Great Great Great Example 19 6.6 Great Great Great Great Great Comparative Example 1 3.8 Inadequate Great Good - - Comparative Example 2 4.5 Good Great Inadequate - - Comparative Example 3 2.0 Good Great Great - -

From Table 2 and FIGS. 2 to 4, Examples 1 to 19 according to the present invention exhibit significantly better heat radiation characteristics than Comparative Examples 1 to 3, even though a thin film coating layer is formed. If ΔT 4 ° C or higher, the heat dissipation characteristics are considered to be good.

Specifically, in Examples 1 and 2, a galvanized steel sheet surface-treated with a heat radiation resin composition containing a water-soluble resin in an amount of 30 parts by weight or less was excellent in heat radiation characteristics but poor in corrosion resistance and solvent resistance. Examples 3 and 4 are galvanized steel sheets surface-treated with a heat radiation resin composition containing a water-soluble resin in an amount of not less than 90 parts by weight, excellent heat dissipation properties and corrosion resistance, but poor electrical conductivity. Examples 11 and 12 are zinc-coated steel sheets surface-treated with a heat-radiating resin composition containing a pigment in an amount of 2.5 parts by weight or less, resulting in poor heat radiation characteristics and electrical conductivity. Examples 13 and 14 are zinc-coated steel sheets surface-treated with a heat radiation resin composition containing a pigment in an amount of 20 parts by weight or more, but the heat radiation properties are excellent, but corrosion resistance, solvent resistance and workability are poor. Example 17 is a galvanized steel sheet surface-treated with a heat radiation resin composition containing an additive in an amount of 20 parts by weight or more, and exhibits excellent heat dissipation characteristics, flat plate corrosion resistance, electrical conductivity, solvent resistance and poor storage stability.

Examples 7 to 10, 15, 16, 18 and 19 exhibited excellent corrosion resistance, electrical conductivity, solvent resistance, solution stability, workability and excellent heat radiation characteristics over 5 ° C.

On the other hand, the steel sheets of Comparative Examples 1 to 3 showed insufficient heat resistance, corrosion resistance, electrical conductivity and solvent resistance as compared with the present invention.

While the invention has been shown and described with reference to certain preferred embodiments thereof, it will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

100: Clear acrylic
200: LED module
300: thermo couple
400: Coated heat generating electrogalvanized steel sheet specimen
500: Support
600: Bridge

Claims (13)

30 to 90 parts by weight of a self-crosslinking synthetic polyurethane dispersion resin per 100 parts by weight of the heat radiation resin composition;
3 to 20 parts by weight of at least one pigment selected from the group consisting of graphite, carbon nanotubes, carbon black, aluminum oxide, zinc oxide, indium tin oxide, aluminum zinc oxide, titanium oxide, boride and nitride;
0.1 to 20 parts by weight of at least one additive selected from the group consisting of organic phosphoric acid compounds, phosphoric acid compounds, organic titanium compounds, vanadium compounds, organic silane compounds, silica compounds, waxes and amine compounds; And
And a residual amount of a solvent.
delete The method according to claim 1,
The self-crosslinking synthetic polyurethane dispersion polymer may be selected from the group consisting of diethylene glycol dimethacrylate, triethylene glycol dimethacrylate, trimethylolpropane triacrylate, tripropylene glycol diacrylate, pentaerythritol triacrylate, Wherein the thermally conductive resin composition is at least one selected from the group consisting of ethylene glycol dimethacrylate, erythritol tetraacrylate, dipentaerythritol pentaacrylate, and dipentaerythritol hexaacrylate.
The method according to claim 1,
Wherein the average particle diameter of the pigment is 10 占 퐉 or less.
The method according to claim 1,
The additive is selected from the group consisting of 1-hydroxyethylene-1,1-diphosphonic acid, ammonium phosphate, sodium phosphate monobasic, sodium diphosphate, sodium triphosphate, tetraethyl titanate, tetraisopropyl titanate, titanium acetylacetonate, Titanate, ammonium vanadate, vanadium acetylacetonate, gamma-glycidoxypropyltrimethoxysilane, beta - (3,4-epoxycyclohexyl) ethyltrimethoxysilane, 3-methaglyoxypropyltrimethoxysilane Wherein the heat radiation resin composition is at least one selected from the group consisting of 3-aminopropyltriethoxysilane, colloidal silica, lithium polysilicate, polyethylene wax, Teflon wax, polyolefin wax, triethylamine and triethanolamine.
The method according to claim 1,
Wherein the heat radiation resin composition further comprises a silicone-based defoaming agent.
The method according to claim 6,
Wherein the defoaming agent is at least one selected from the group consisting of dimethyl silicone, silicone, polydimethylsiloxane, polymethylsiloxane, and fluorosilicon.
The method according to claim 1,
The remaining solvent may be a solvent such as pure water, xylene, ethylene acetate, methyl acetate, cellosolve acetate, ethylacetate, butyl acetate, toluene, tetrahydrofuran, carbon disulfide, chloroform, trichlorethylene, n-hexane, dichloromethane, But are not limited to, ethanol, methylcyclohexanone, methylcyclohexanol, methylbutylketone, methylethylketone, methylisobutylketone, 1-butanol, 2-butanol, cyclohexanone, cyclohexanol, acetone, ethylene glycol monomethyl ether, Propylene glycol monomethyl ether, ethylene glycol monobutyl ether, ethylene glycol monoethyl ether acetate, N, N-dimethylpyrrolidone, N, N-dimethylpyrrolidone, &Lt; / RTI &gt; isopropyl alcohol, formamide, ortho-dichlorobenzene, isopentyl alcohol and isopropyl alcohol. And at least one member selected from the group consisting of a thermosetting resin and a thermosetting resin.
8. A method for manufacturing a galvanized steel sheet, comprising the steps of: applying a heat radiation resin composition according to any one of claims 1 to 8 to a galvanized steel sheet; And
A method for surface treatment of a galvanized steel sheet using a heat radiation resin composition, comprising the step of forming a heat radiation resin coating layer by drying a heat radiation resin composition applied to a galvanized steel sheet,
Wherein the heat radiation resin composition comprises 20 to 90 parts by weight of at least one water-soluble resin selected from the group consisting of a urethane resin, an acrylic resin, an epoxy resin, an ester resin and an olefin resin, based on 100 parts by weight of the heat radiation resin composition;
1 to 20 parts by weight of at least one pigment selected from the group consisting of graphite, carbon nanotubes, carbon black, aluminum oxide, zinc oxide, indium tin oxide, aluminum zinc oxide, titanium oxide, boride and nitride;
0.1 to 20 parts by weight of at least one additive selected from the group consisting of organic phosphoric acid compounds, phosphoric acid compounds, organic titanium compounds, vanadium compounds, organic silane compounds, silica compounds, waxes and amine compounds; And
Lt; RTI ID = 0.0 &gt; solvent. &Lt; / RTI &gt;
10. The method of claim 9,
Wherein the galvanized steel sheet is at least one selected from the group consisting of an electrogalvanized steel (EG), a galvanizing steel (GI), and a galvannealed steel (GA). Way.
10. The method of claim 9,
Wherein the heat radiation resin composition is applied to one side or both sides of a galvanized steel sheet in an amount of 500 to 3,000 mg / m &lt; ² &gt;.
10. The method of claim 9,
Wherein the heat radiation resin composition applied to the galvanized steel sheet is dried at a PMT (Peak Metal Temperature) temperature of 150 to 190 ° C.
9. A galvanized steel sheet coated with the heat radiation resin composition according to any one of claims 1 to 8.

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