KR20150004712A - Ceramic composition and method for manufacturing the same, and heat radiating member using the same - Google Patents

Abstract

The purpose of the present invention is to provide a ceramic composition having excellent thermal radiating performance and insulation properties, a manufacturing method thereof, and a thermal radiating member using the same. To this end, the ceramic composition of the present invention comprises a ceramic resin; a dispersion medium; and an inorganic filler. The ceramic composition is coated on the surface of a coated objet, and forms a film having excellent properties such as improved voltage resistance, high thermal resistance, and thermal conductivity. The ceramic resin can be formed by hydrolysis of alkoxysilane, a colloidal metal oxide, and acid.

Description

TECHNICAL FIELD [0001] The present invention relates to a ceramic composition, a method of manufacturing the same, and a heat dissipating member using the same. BACKGROUND ART [0002]

TECHNICAL FIELD The present invention relates to a ceramic composition, a method of manufacturing the same, and a heat dissipating member using the same, and more specifically, to a ceramic composition having excellent heat dissipation ability and insulation property including a ceramic resin, an alcohol, an inorganic filler and an inorganic pigment, To a heat dissipating member.

In recent years, in order to protect the surfaces of mobile phone cases, home electric appliance cases, automobile interior and exterior materials, LED lighting apparatuses, metal and non-ferrous metal parts and various displays, and to prevent scratches, coating film compositions .

However, when an organic resin alone is used to coat the surface of such a product, wear resistance, durability, and chemical resistance are improved, but the coating layer is cloudy and nonuniform particles are formed. On the other hand, when a silicone resin or the like is used for coating, there is a problem that the surface hardness, scratch resistance, adhesion, abrasion resistance and physical properties of gloss are not satisfied.

On the other hand, a general metal material starts to generate heat at the same time a power source or a heat source is supplied by the conduction phenomenon of heat. At this time, it is necessary to distribute the heat as much as possible so as not to concentrate in one place and to discharge it out quickly.

In order to discharge heat, a conventional physical method or a method of changing materials is used. Recently, metal copper clad laminate (MCCL) with metal has been used as an LED module.

However, in this case, there is a problem that the lifetime of the device is shortened due to heat generation of the LED, so that the device must be frequently replaced or repaired. Further, when a metal copper clad laminate is applied to household appliances such as a lighting apparatus, a back light unit (BLU) of a LCD, and a notebook computer, there is a problem that heat dissipation performance is required for improving the efficiency and safety of the product.

Therefore, there is an urgent need for an invention to solve the problems of the prior art as described above, and it is almost impossible to find a way to disclose it in relation to a coating composition which is applied on the surface of a metal or a nonferrous metal material, none.

Therefore, the inventors of the present invention have completed the present invention on a ceramic composition which is excellent in heat radiation property and insulation property by reacting alkoxysilane and nanocolloid silica and adding alcohol, inorganic filler and inorganic pigment.

An object of the present invention is to provide a ceramic composition excellent in heat radiation performance and insulation.

Another object of the present invention is to provide a ceramic composition which is coated on the surface of a molten aluminum steel plate, an aluminum steel plate and other metallic steel sheets to form a coating film improved in voltage resistance, high heat resistance and thermal conductivity.

Another object of the present invention is to provide a method of manufacturing a ceramic composition which is excellent in heat radiation performance and insulation.

Another object of the present invention is to provide a coating method of a ceramic composition excellent in heat radiation performance and insulation.

The above and other objects of the present invention can be achieved by the present invention described below.

One aspect of the present invention relates to a ceramic composition comprising a ceramic resin, a dispersion medium and an inorganic filler.

The ceramic resin may be formed by hydrolysis of an alkoxysilane, a colloidal metal oxide and an acid.

The alkoxysilane may include a silane compound represented by the following formula (1)

[Chemical Formula 1]

R ' Si (OR) 4-n

(Wherein R is a substituted or unsubstituted alkyl group having 1 to 6 carbon atoms, R 'is a substituted or unsubstituted alkyl group having 1 to 6 carbon atoms, and n is 0 to 3).

The colloidal metal oxide may include at least one member selected from the group consisting of colloidal silica, colloidal alumina, and colloidal zirconia.

The colloidal metal oxide may include nanocolloidal particles having an average particle diameter of 0.1 to 400 nm.

The inorganic filler may be selected from the group consisting of carbon nanotubes (CNT), boron nitride, silicon nitride, boron oxide, aluminum oxide, mica, mica, feldspar, titanium oxide, zirconia, nano diamond, silica, kaolin, talc, , And diatomaceous earth.

The ceramic composition comprises 20 to 85% by weight of a ceramic resin; 5 to 30% by weight of a dispersion medium; And 1 to 50% by weight of an inorganic filler.

The ceramic composition may further include a pigment.

Another aspect of the present invention relates to a method for forming a ceramic resin, comprising: hydrolyzing an alkoxysilane with a colloidal metal oxide and an acid to form a ceramic resin; And mixing the ceramic resin with a dispersion medium, an inorganic filler, and an inorganic pigment.

Another aspect of the present invention relates to an image forming apparatus comprising: a substrate; And a coating layer formed on the surface of the substrate, wherein the coating layer is formed from the ceramic composition of the present invention.

The surface of the object may be uneven.

The ceramic composition according to the present invention is coated on the surface of a molten aluminum steel sheet, an aluminum steel sheet and other metal sheet materials to form a coating film having excellent resistance to voltage, heat resistance and thermal conductivity, And the electronic devices of the automobile industry, it is possible to rapidly dissipate the heat generated by the surface coating to the outside, thereby providing excellent heat dissipation performance and insulation that can maintain the performance of the device.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a process flow chart showing a method for producing a ceramic composition according to one embodiment of the present invention. FIG.
2 is a process flow chart showing a method of applying a ceramic composition according to one embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily carry out the present invention. The present invention may be embodied in many different forms and is not limited to the embodiments described herein.

In order to clearly illustrate the present invention, parts not related to the description are omitted, and the same or similar components are denoted by the same reference numerals throughout the specification.

The content in the present invention is based on " solids " unless otherwise specified.

In addition, the terms described below are terms defined in consideration of the functions of the present invention, which may vary depending on the intention or custom of the user, the operator. Therefore, definitions of these terms should be made based on the contents throughout this specification.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, a ceramic composition having excellent heat radiation performance and insulation, a method of manufacturing the same, and a heat dissipating member using the same will be described with reference to the drawings.

Ceramic composition

The ceramic composition, which is one aspect of the present invention, includes a ceramic resin, a dispersion medium, and an inorganic filler.

The ceramic composition comprises 20 to 85% by weight of a ceramic resin; 5 to 30% by weight of a dispersion medium; And 1 to 50% by weight of an inorganic filler.

In an embodiment, the ceramic composition comprises 1 to 80% by weight of a ceramic resin, 5 to 25% by weight of an alcohol, 0.1 to 5% by weight of an acid catalyst, 1 to 50% by weight of an inorganic filler, and 0.5 to 35% .

In the present invention, the " ceramic resin " is formed through a sol-gel reaction. In general, the sol-gel process is a process for producing a ceramic resin at a relatively low temperature by using a hydrolysis reaction and a condensation reaction. As the colloid-suspended sol continues to react, To form a network or a polymer chain connected to each other by the polymer chain, thereby resulting in a gel state in which fluidity is lost.

The ceramic resin formed through such a sol-gel reaction does not need to be cured at a high temperature such as a porcelain enamel or a water glass, and can be cured at a curing temperature of a typical organic coating.

Further, since the ceramic resin is subjected to a deblocking reaction by hydrolyzing monosilane, it can be easily cured even at a low temperature. Therefore, unlike the conventional coating compositions using a silicone resin, the present invention can easily perform a curing reaction at a temperature of about 100 to 250 ° C without a curing accelerator such as a metal catalyst.

In addition, since the ceramic resin contains a hydroxyl group (-OH) in the ceramic resin, the ceramic resin is easy to chemically bond with the organic resin, thereby improving the cross-link density with the organic resin during curing, A coating film having improved scratch resistance and abrasion resistance can be formed.

Other formed coatings are excellent in adhesion to substrates such as outer appearance and internal and external materials, excellent in heat resistance and cold resistance, and are physically and chemically stable due to ceramization of the final reactant after curing. In contrast to organic coatings, It has excellent heat dissipation and insulation performance to maintain durability.

The ceramic resin can be obtained by various methods. For example, the ceramic resin may be formed by hydrolysis of an alkoxysilane, a colloidal metal oxide and an acid.

In one embodiment, a ceramic resin obtained through sol-gel reaction of an alkoxysilane and a colloidal metal oxide may be used to further improve the crosslinking density. At this time, the water used as a solvent forms a Si-O-Si bond capable of forming a coating film through a hydrolysis reaction and a condensation reaction with an alkoxysilane.

In one embodiment, the mixing molar ratio of the colloidal silica and the alkoxysilane forming the ceramic resin may be 20 to 50: 50 to 80 mole ratio. When the colloidal silica and the alkoxysilane are mixed in the molar ratio described above, water reactivity and storage stability are good, and furthermore, the physical properties of the coating material are good.

In one embodiment, the ceramic resin may be prepared by a method comprising slowly dropping an alkoxysilane and optionally an organic solvent onto a colloidal silica to perform a hydrolysis reaction and a condensation reaction.

The colloidal silica (silica sol) means a solution in which fine silica particles (SiO2) having a particle size of 5 to 100 nm are dispersed in 20 to 40% water, and when reacting with alkoxysilane, .

In one embodiment, the colloidal metal oxide is prepared by adding an acid catalyst to colloidal silica to adjust the pH to about 2 to 3, and slowly dropping the alkoxysilane and optionally an organic solvent into the resulting solution, Followed by decomposition and condensation reaction. The pH of the colloidal silica is not particularly limited, but is preferably in the range of about 6.5 to 8.5.

In one embodiment, the ceramic composition comprises a compound represented by the general formula RnSi (OR ') 4 to n wherein R is an alkenyl group having 1 to 6 carbon atoms, R' is an alkyl group having 1 to 5 carbon atoms, 1 to 35% by weight of alkoxysilane represented by hydrolyzate and condensate in terms of the hydrolyzate and condensate, 1 to 45% by weight of nano-colloidal silica dispersed in water or an organic solvent in terms of solid content, 5 to 25% by weight of one or more lower aliphatic alcohols selected from the group consisting of alcohols, propyl alcohols, isopropyl alcohols and n-butanol: at least one selected from the group consisting of phosphoric acid, hydrochloric acid, sulfuric acid, nitric acid, 0.1 to 5 wt% of at least one inorganic filler selected from the group consisting of carbon nanotubes (CNT), boron nitride, silicon nitride, boron oxide, aluminum oxide, mica, mica, feldspar, titanium oxide, zirconia, % By weight, inorganic pigments and non-toxic 0.5 to 40% by weight of at least one inorganic pigment selected from the group consisting of pearl pigments.

Further, in one embodiment, the ceramic resin may comprise 1 to 35% by weight of an alkoxysilane and 1 to 45% by weight of a colloidal metal oxide.

The alkoxysilane may include a silane compound represented by the following formula (1)

[Chemical Formula 1]

R ' Si (OR) 4-n

(Wherein R is a substituted or unsubstituted alkyl group having 1 to 6 carbon atoms, R 'is a substituted or unsubstituted alkyl group having 1 to 6 carbon atoms, and n is 0 to 3).

In one embodiment, examples of the substituent include C1-C5 alkoxysilane containing C1-C10 alkyl group, C1-C5 alkoxysilane containing glycidyl group, C1-C5 alkoxysilane containing acryl group, And C1 to C5 alkoxy silanes containing at least two functional groups selected from a glycidyl group, C1 to C10 alkyl groups and acrylic groups, but are not limited thereto.

These may be used alone or in admixture of one or more. C1-C5 alkoxysilane containing a glycidyl group, C1-C5 alkoxysilane containing a C1-C10 alkyl group, and C1- C5 alkoxysilane may be used in combination or a C1-C5 alkoxysilane containing both a glycidyl group, a C1-C10 alkyl group and an acrylic group may be used.

In one embodiment, the alkoxysilane is selected from the group consisting of methyltrimethoxysilane, methyltriethoxysilane, ethyltrimethoxysilane, ethyltriethoxysilane, tetraethylorthosilicate, phenyltrimethoxysilane, and phenyltriethoxysilane May be used in combination.

As shown in the following reaction formula, the alkoxysilane used in the present invention has a structure in which silanol is formed by replacing a reactive group of a silane with a hydroxyl group (-OH) by hydrolysis with water, Condensation reaction with other silanol forms a structure such as -Si-O-Si-O-, and at the same time, chemically and physically bonds with the colloidal silica to form a ceramic resin having a continuous network structure in gel state.

When such a ceramic resin is cured at the time of forming a coating film, a condensation reaction between the hydroxyl group (-OH) of the ceramic resin and the other hydroxyl group causes a condensation reaction of -O- (Si-O-Si) A coating film can be formed.

[Reaction Scheme]

The colloidal metal oxide may include at least one member selected from the group consisting of colloidal silica, colloidal alumina, and colloidal zirconia.

The content of the colloidal metal oxide used in the present invention is based on the solid content.

In one embodiment of the present invention, nanocolloidal silica is used as the colloidal metal oxide. This is because it is cheaper than colloidal alumina or zirconia and is easy to hydrolyze with alkoxysilane.

The nanocolloidal silica containing water or an organic solvent as a dispersion medium is added in order to hydrolyze the alkoxysilane, to improve the adhesion and hardness of the coating film, and to impart abrasion resistance. At this time, water makes a Si-O-Si bond capable of forming a coating film through hydrolysis and condensation with an alkoxysilane.

The colloidal metal oxide may include nanocolloidal particles having an average particle diameter of 0.1 to 400 nm.

The colloidal silica used in the present invention is a state in which silica is dispersed in a solvent such as water (H2O), and the size of the silica particles is very small, ranging from several nm to several hundreds of nm, so that the Brownian motion is hardly affected by gravity It is in a state of being able. The solid content of the colloidal silica is not particularly limited, but is preferably in the range of 20 to 40% by weight based on the total weight of the colloidal silica.

The average particle size of the silica in the colloidal silica used in one embodiment of the present invention may range from about 0.1 to 400 nm, preferably from 1 to 300 mm. By the evaporation of the dispersion medium in the above range, the nanoparticles are uniformly self-assembled, the particles sink, and the mobility of the particles in each direction becomes easy, so that a uniform photonic crystal can be produced.

Further, in the present invention, the ceramic composition may include an inorganic acid or an organic acid which is an " acid catalyst ".

Although the hydrolysis reaction is usually carried out without adding such an acid catalyst, the hydrolysis reaction can be rapidly and completely performed by adjusting the pH of the solution to about 2 to 3 by adding an acid catalyst. The acid catalyst of the present invention is preferably used in a range of about 2 to 5 parts by weight based on 100 parts by weight of the colloidal silica-containing solution in order to adjust the pH of the solution containing the colloidal silica to about 2 to 3.

The inorganic acid or organic acid may be at least one selected from the group consisting of phosphoric acid, hydrochloric acid, sulfuric acid, acetic acid, nitric acid, oxalic acid, formic acid and formic acid. The acid as a catalyst accelerates the hydrolysis and completes the condensation reaction, It plays a role. In addition, precipitation formation and liquid phase separation are prevented to perform a peptizing action to form a homogeneous solution. If the amount of the addition is excessive, the stability of the composition is deteriorated. If the addition amount is small, the physical properties of the coating film are deteriorated, .

The above-mentioned " dispersion medium " is a solvent in the presence of a solvent such as toluene, xylene, an aromatic hydrocarbon solvent, a hydrocarbon solvent such as n-hexane, cyclohexane or n-heptane, a halogenated hydrocarbon solvent such as methylene chloride, chloroform or dichloroethane, Ether such as dioxane, tetrahydrofuran, dibutyl ether, butyl ethyl ether, methyl-t-butyl ether, terpinyl methyl ether, dihydroterpinyl methyl ether, diglyme 1,3- Based solvents such as acetone, acetophenone, methyl ethyl ketone, methyl propyl ketone, diethyl ketone, methyl n-butyl ketone, methyl isobutyl ketone, dipropyl ketone, diisobutyl ketone, methyl amyl ketone, acetonyl acetone, , Ketone solvents such as cyclohexanone, methylcyclohexanone, 2- (1-cyclohexenyl) cyclohexanone methyl isobutyl ketone, cyclohexanone and isophorone, ethyl formate, propyl formate, butyl formate, Propyl acetate, isopropyl acetate, isobutyl acetate, isobutyl acetate, sec-butyl acetate, isoamyl acetate, cyclohexyl acetate, ethyl lactate, isopropyl acetate, Butyl acetate, 2-ethylhexyl acetate, benzyl acetate, methyl propionate, ethyl propionate, methyl monochloroacetate, ethyl monochloroacetate, butyl monochloroacetate, acetoacetic acid Ester solvents such as methyl acetate, ethyl acetoacetate, butyl propionate, propionic acid diisobutylether and? -Butyrolactone; ester solvents such as ethylene glycol monoethyl ether, ethylene glycol monoisopropyl ether, ethylene glycol monobutyl ether, diethylene glycol monoethyl ether , Diethylene glycol mono-n-butyl ether, propylene glycol monomethyl ether, propylene glycol Propylene glycol mono-n-butyl ether, dipropylene glycol monomethyl ether, dipropylene glycol monoethyl ether, dipropylene glycol mono-n-propyl ether, dipropylene glycol mono n- Butyl ether, triethylene glycol monomethyl ether, triethylene glycol monoethyl ether, triethylene glycol mono n-propyl ether, triethylene glycol mono n-butyl ether, tripropylene glycol monoethyl ether, tripropylene glycol mono n-propyl ether , Tripropylene glycol mono-n-butyl ether and the like, and acetoester solvents of these monoethers, diethylene glycol dimethyl ether, diethylene glycol diethyl ether, diethylene glycol methyl isobutyl ether, dipropylene Glycol dimethyl ether, dipropylene glycol diethyl ether and the like It can be an alkyl ether solvent. Butanol, isopropyl alcohol, isopropyl alcohol, n-butyl alcohol, isopropyl alcohol, n-butyl alcohol, isopropyl alcohol, Methyl-1-butanol, isoamyl alcohol, t-amyl alcohol, sec-butyl alcohol, isopropyl alcohol, Butanol, heptyl alcohol, n-octyl alcohol, 2-ethylhexyl alcohol, nonyl alcohol, decyl alcohol, octyl alcohol, isoamyl alcohol, neoamyl alcohol, hexyl alcohol, But are not limited to, alcohols, such as alcohols, alcohols, lauryl alcohols, cyclopentanol, cyclohexanol, benzyl alcohol,? -Terpineol, terpineol C, L-? -Terpineol, dihydroterpineol, Terpinyloxyethanol, Terusolve MTPH manufactured by NIPPON TERPENE CHEMICALS, INC., Terusolve DTO-210, Terusolve THA-90, Teruso such as FINE OXOCOL 140N, FINE OXOCOL 1600, FINE OXOCOL (manufactured by Nissan Chemical Industries, Ltd.), lhe THA-70, cyclohexanol, 3-methoxybutanol, diacetone alcohol, 1,4-butanediol, 180, FINE OXOCOL 180N, FINE OXOCOL 2000, etc.), ethylene glycol, diethylene glycol, triethylene glycol, propylene glycol, dipropylene glycol, 1,3-butylene glycol, hexylene glycol, polyethylene glycol, And glycol solvents such as glycols. In addition, amide solvents such as dimethylacetamide and dimethylformamide can be used. Ethylenically unsaturated monomers such as (meth) acrylic acid, (meth) acrylic acid esters having a reactive group as a dispersion medium, vinyl monomers such as vinyl acetate, vinyl ether derivatives, and polyallyl derivatives can also be used.

In addition, various kinds of resins, oligomers, and monomers used for ordinary paints, point coating, and molding can also be used without particular limitation. Specific examples include acrylic resins, polyester resins, alkyd resins, urethane resins, silicone resins, fluororesins, epoxy resins, polycarbonate resins, polyvinyl chloride resins and polyvinyl alcohol.

The dispersion medium may be used alone or in combination of two or more. The dispersant of the present invention is intended to provide a dispersion of fine particles in a non-aqueous environment. However, whether the dispersion medium is intentionally or accidentally applied to the dispersion medium, In product design, it does not deny the mixing and mixing of water.

Also, in one embodiment, when using these materials as a dispersion medium, use of 5 to 25 wt% is preferred. In this range, the coating surface is good and the polymerization reaction is suitably carried out, the pot life is increased, and the insulation and heat radiation performance are increased.

In addition, in one embodiment, the dispersion medium used may be used to selectively control the reaction rate and the like upon mixing the alkoxysilane with the colloidal silica. In this case, the above-mentioned ceramic resin can be uniformly dissolved, The solvent is not particularly limited as long as it can control the flowability, but it is preferable to use an alcohol solvent excellent in the reaction rate control and storage stability.

Such a dispersion medium is a balance material which is adjusted so that the total amount of the ceramic composition is 100 parts by weight based on 100 parts by weight of the ceramic composition in consideration of workability of the ceramic composition, storage stability, surface hardness of the formed coating film, scratch resistance, .

The inorganic filler may be at least one selected from the group consisting of carbon nanotubes (CNTs), nitrides, silicon nitrides, oxides, aluminum oxides, mica, mica, feldspar, titanium oxide, zirconia, nano diamond, silica, kaolin, talc, , And diatomite, but the present invention is not limited thereto. These may be used alone or in combination of two or more.

The "inorganic filler" referred to in the present invention is added for the purpose of improving the hardness of the coating film, preventing the coating film from cracking, preventing the deposition of the coating material, preventing corrosion of the material, improving durability, improving abrasion resistance, improving thermal conductivity and improving insulation.

In addition, the inorganic filler can be selectively applied according to shape and particle size of spherical, acicular, plate-like, and the like in consideration of heat dissipation and insulation.

The ceramic composition may further include a pigment.

The kind of the above-mentioned " pigment " mentioned in the present invention is not particularly limited, and examples of the inorganic pigment include titanium oxide powder, alumina powder, iron oxide powder such as Venetian red naphtha sienna, lead oxide powder, carbon black, graphite Cadmium yellow, cadmium red, chrome yellow, cobalt yellow, cobalt blue, cerulean blue, cobalt green and the like can be used. Examples of the organic pigments include phthalocyanine blue, phthalocyanine green, quinacridone, perylene, anthrapyrimidine, carbazole violet, anthrapyridine, azo orange, flavansolone yellow, isoindoline yellow, azo yellow, Tron blue, dibrom anthrone red, perylene red, azo red, and anthraquinone red.

In one embodiment, the inorganic pigment may be added by dispersing the heat resistant pigment or non-toxic pearl pigment, which is an inorganic pigment widely available on the market, by mixing one or two or more kinds of them in a ball mill.

In one embodiment, the inorganic pigment includes a metal such as titanium, iron, cobalt, chromium, antimony, zinc, copper, molybdenum, manganese, and oxides thereof to realize a hue.

The ceramic composition of the present invention can be utilized as a coating composition as an application form. At this time, in addition to the above-mentioned components, optional additives such as a diluent, a surface conditioner, a viscosity modifier, a thickener, an antioxidant, May be added. These additives may be added to the composition in amounts known in the art.

In one embodiment, the anti-slip agent may be selected from silica sand, alumina, sanding yarn and glass powder, and more preferably 100 to 500 μm.

In one embodiment, the functional additive may be a silicone oil or a non-silicone oil, such as a polysiloxane having a water-repellent function, so as to improve wetting, dispersibility, non-stickiness, Antimicrobial agents can be used to inhibit the production.

Method for producing ceramic composition

Another aspect of the present invention is a method for producing a ceramic composition, comprising: hydrolyzing an alkoxysilane with a colloidal metal oxide and an acid to form a ceramic resin; And mixing the ceramic resin with a dispersion medium, an inorganic filler, and an inorganic pigment.

Referring to FIG. 1, the present invention relates to a method for producing a hydrolysis product, which comprises mixing hydrolysis reaction of alkoxysilane with an organic acid or inorganic acid (S11) by mixing nanocolloid silica with a nanocolloid silica, adding a dispersion medium, an inorganic filler and an inorganic pigment to the hydrolysis reaction product S15), and dispersed (S17) with a basket mill to a mean particle size of 10 mu m or less by a pulverizer to produce a ceramic composition having excellent heat radiation performance and insulation (S19).

The ceramic composition prepared in one embodiment of the present invention is coated on the surface of a molten aluminum steel sheet, an aluminum steel sheet and other metal sheet materials to form a coating film having excellent resistance to withstand voltage, high heat resistance and thermal conductivity, And has excellent heat dissipation ability and insulation property that can quickly discharge heat generated by surface coating on electronic devices, apparatuses, and electronic devices of the automobile industry, thereby maintaining the performance of the device.

The heat radiating member using the ceramic composition

Another aspect of the present invention is a heat dissipating member using a ceramic composition, which is an aspect of the present invention, And a coating layer formed on the surface of the substrate, wherein the coating layer is formed from the ceramic composition of the present invention.

The " heat-radiating member " referred to in the present invention has a main function of discharging and dissipating high-temperature heat generated in a light source body, in particular, an electrode, etc., to the outside and connecting the same to a light source mechanism, , It has the effect of increasing the heat radiating effect without increasing the overall thickness.

As shown in FIG. 2, in an embodiment of the present invention, the substrate is subjected to a surface treatment (S10), a preheating treatment (S20) is performed, and an inorganic ceramic composition having excellent heat dissipation performance and insulation is applied to the surface of the preheated substrate ) And curing (S40) to form a high heat-resistant inorganic coating layer (S50).

In one embodiment of the present invention, a high heat-resistant ceramic composition having excellent heat dissipation performance and insulation for surface coating of an LED lighting fixture having both a thermal conductivity and an insulation property between a substrate and a conductive layer by coating on the surface of the substrate is formed.

It is preferable that the ceramic composition formed on the substrate is formed on the surface of the substrate subjected to the physical surface treatment or the chemical surface treatment. This is for improving adhesion with the substrate, improving heat radiation performance, improving insulation, and improving heat resistance.

The method of forming a coating layer on the surface of a substrate such as a plastic, metal, glass, wood, tile, or ceramic using the ceramic composition is not particularly limited.

In one embodiment of the present invention, the substrate is thoroughly washed, preheated with an ultraviolet light irradiator to remove remaining oil and foreign substances, and then the ceramic composition is coated on the surface of the substrate, followed by drying at a temperature of 150 to 300 ° C to remove the solvent And the coating layer can be formed by thermosetting.

The preheating temperature may be 20 to 80 캜, preferably 30 to 70 캜. It is possible to more appropriately remove the moisture of the substrate after completion of the surface treatment in the above-mentioned temperature range, and also to prevent the cause of the PIN-HOLE when the smoothness of the coating film is lowered.

In the specific example, the surface of the object may be unevenly formed on the surface of the object before the ceramic composition is coated to increase the specific surface area, thereby improving the adhesion with the object. For example, the surface of the substrate may be sandblasted to form fine irregularities to increase the adhesive strength and durability.

There is no particular limitation on the method of coating the ceramic composition. For example, dip coating, spray coating, flow coating, roll coating, gravure coating, and the like can be used.

In one embodiment of the present invention, the thickness of the formed inorganic coating layer is 1 to 2 times or more, preferably 20 to 200 占 퐉, more preferably 30 to 170 占 퐉, 40 to 150 mu m.

The inorganic coating layer formed in the above range may have excellent heat dissipation ability, insulation and other high heat resistance as compared with the conventional coating layer. In addition, the nano-particle of the colloidal silica remarkably reduces voids in the coating film, and has the characteristics of hardness improvement, crack prevention, high heat resistance, insulation and high heat dissipation.

Hereinafter, the configuration and operation of the present invention will be described in more detail with reference to preferred embodiments of the present invention. It is to be understood, however, that the same is by way of illustration and example only and is not to be construed in a limiting sense.

Further, it is to be understood that the present invention is not limited to the above-described embodiments, and various modifications and changes may be made without departing from the scope of the present invention.

Example

Preparation for implementation

The specifications of each component used in the following examples and comparative examples are as follows.

Alkoxysilane: methyltrimethoxysilane, methyltriethoxysilane, tetraethylorthosilicate and the like manufactured by DOW CORNING were used.

Colloidal silica: LuDox colloidal silica HS-40 manufactured by DU PONT Co., USA and 1034A manufactured by Nalco, USA were used.

An acid: Acetic acid (CH3COOH), Sejong Chemical BRONS-KET 7210, etc. was used.

Dispersion medium: methanol, isopropyl alcohol and the like were used.

Inorganic filler 1: Potassium titanate (Tismo-D) manufactured by Otsuka Chemical Co., Ltd. was used.

Inorganic filler 2: ALUMINUM OXIDE AES-11 and A-21 of SUMITOMO CHEMICAL, Japan. ALM-43, and AL-160SG-3.

Inorganic filler 3: BORON NITRIDE (BN-HS) manufactured by DENKA of Japan was used.

Inorganic filler 4: CNT, SM-1000 manufactured by MICAIN Corporation, etc. were used.

Pigment: Non-toxic inorganic pigment such as TiO2 was used.

As a mixed solvent or additive, pa-67 of DOW CORNING was used.

Coating material: I used a heat sink of park lighting fixture of Daesung Entec Co., Ltd.

Example 1a

The mixture of alkoxysilane, nano-colloidal silica, nano-colloidal alumina and organic acid was mixed with the composition shown in Table 1 below and then hydrolyzed to prepare a ceramic resin. Then, isopropyl alcohol, an inorganic filler and an inorganic pigment were added to the ceramic resin, A composition was prepared. The prepared ceramic composition was ball milled, and then a ball-milled ceramic composition was applied to the substrate to a thickness of 58 mu m to form a coating layer.

Example 1b

The procedure of Example 1a was repeated except that the ball-milled ceramic composition was applied to the substrate in a thickness of 81 탆.

Example 1c

The procedure of Example 1a was repeated except that the ball-milled ceramic composition was applied to the substrate in a thickness of 97 탆.

Example 2a

The procedure of Example 1 was repeated except that the composition of the ceramic composition was changed to the composition shown in the following Table 1, and a ball-milled ceramic composition was applied to the substrate in a thickness of 55 탆.

Example 2b

The procedure of Example 2a was repeated except that the ball-milled ceramic composition was applied to the substrate in a thickness of 73 탆.

Example 2c

A ball-milled ceramic composition was applied to the substrate in a thickness of 112 탆, and the same procedure as in Example 2a was conducted.

Examples 1a-1c Examples 2a to 2c
three
la
Mick
Number
G Organoalkoxysilane
(MTMS, MTES) 24 24 Tetraalkoxysilane
(TEOS) - 5 Colloidal silica 30 30 Colloidal alumina 5 - mountain
(Acetic acid) One One
minute
mountain
every
ethanol - 5 Isopropyl alcohol 15 10 Mixed solvent
/ additive One One
radish
group
insect
camp
My Inorganic filler 1
(Potassium titanate) 10 9 Inorganic filler 2
(Aluminum oxide) 5 5 Inorganic filler 3
(Boron nitride) 5 4 Inorganic filler 4
(mica) 2 3 Inorganic pigments
(Other than TiO2) 2 3 system 100 100

Comparative Example 1: Preparation of silver-plated composition

Experiments were carried out under the same conditions as in Example 1a except that a coating layer was formed by silver plating of 75 占 퐉 thickness instead of a ball-milled ceramic composition.

Comparative Example 2: Preparation of silver-plated composition

An experiment was conducted under the same conditions as in Example 2a except that a coating film layer was formed of silver plating of 75 占 퐉 thickness instead of a ball-milled ceramic composition.

The physical properties of the coating layers of Examples and Comparative Examples were measured by the following methods, and the results are shown in Tables 2 and 3.

How to measure property

(1) Adhesion force: A tape peeling test was performed after 100/100 at 1 mm intervals using the test method KS M ISO2409: 2008 for adhesive force measurement.

(2) Hardness: The test was carried out using the test method KS M ISO15184: 2002 for the hardness measurement and the test method KS D6711: 2012 for the impact resistance measurement, respectively.

(3) Heat resistance: Heat resistance was measured at 300 ° C. for 2 hours in an electric furnace using a MUFFLE FURNACE DF-4, a laboratory electric furnace of Daeheung Science Co., Ltd. for measuring the heat resistance.

(4) Dielectric strength test: Dielectric breakdown voltage test was performed using a measuring instrument KIKUSUI TOS 5051A for measuring the withstand voltage.

(5) Film Thickness: The film thickness measurement experiment was conducted using TM-510FN, a measuring instrument of TM TECH Co., to measure the film thickness.

Measurement data 08:00 12:00 15:00 18:00 silver plate Comparative Example 1 26.3 50.8 56.7 57.2 Comparative Example 2 26.5 50.9 56.9 56.9 ceramic Example 1a 27.1 43.5 46.3 48.6 Example 2a 26.4 43.1 46.0 48.3

As shown in Table 2, the thermal conductivity of the coating layer prepared by the example of the present invention is superior to that of the comparative examples 1 and 2.

division Properties of high heat-resistant inorganic coating film Film thickness Adhesion Hardness Heat resistance Withstand voltage (탆) (100 * 100) (H) (300 DEG C / 2 hours) AC (KV) Example 1 a 58 100 * 100 8 OK 3.5 b 81 100 * 100 7 OK 4.0 c 97 100 * 100 7 OK 4.3 Example 2 a 55 100 * 100 8 OK 3.7 b 73 100 * 100 7 OK 3.9 c 112 100 * 100 7 1 hour NG 3.3 Comparative Example One 75 100 * 100 6 ok Current flow 2 75 100 * 100 6 ok Current flow

As shown in Table 3, it was confirmed that the physical properties such as heat resistance, hardness, insulation and heat dissipation of the inorganic coating layer for surface coating of the illuminator according to the present invention are much better than those of Comparative Examples 1 and 2.

Claims (11)

a) a ceramic resin;
b) dispersant; And
c) inorganic fillers;
≪ / RTI >
The method according to claim 1,
Wherein the ceramic resin is formed by hydrolysis of an alkoxysilane, a colloidal metal oxide and an acid.
3. The method of claim 2,
Wherein the alkoxysilane comprises a silane compound represented by the following formula (1).
[Chemical Formula 1]
R ' Si (OR) 4-n
(Wherein R is a substituted or unsubstituted alkyl group having 1 to 6 carbon atoms, R 'is a substituted or unsubstituted alkyl group having 1 to 6 carbon atoms, and n is 0 to 3)
3. The method of claim 2,
Wherein the colloidal metal oxide comprises at least one member selected from the group consisting of colloidal silica, colloidal alumina and colloidal zirconia.
5. The method of claim 4,
Wherein said colloidal metal oxide comprises nanocolloidal particles having an average particle size of from 0.1 to 400 nm.
The method according to claim 1,
The inorganic filler may be selected from the group consisting of carbon nanotubes (CNT), boron nitride, silicon nitride, boron oxide, aluminum oxide, mica, mica, feldspar, titanium oxide, zirconia, nano diamond, silica, kaolin, talc, And at least one member selected from the group consisting of zirconium and zirconium.
The method according to claim 1,
The ceramic composition comprises 20 to 85% by weight of a ceramic resin; 5 to 30% by weight of a dispersion medium; And 1 to 50% by weight of an inorganic filler.
The method according to claim 1,
Wherein the ceramic composition further comprises a pigment.
a) hydrolyzing an alkoxysilane with a colloidal metal oxide and an acid to form a ceramic resin; And
b) mixing the ceramic resin with a dispersion medium, an inorganic filler and an inorganic pigment;
≪ / RTI > wherein the ceramic composition comprises at least one ceramic powder.
Coating; And
A coating layer formed on the surface of the substrate;
Wherein the coating layer is formed from the ceramic composition of any one of claims 1 to 9.
11. The method of claim 10,
Wherein the surface of the article is formed with irregularities.

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