KR101986168B1 - Coating liquid applicable to radiation fins for LED with dust collection prevention and self-cleaning function and manufacturing method thereof - Google Patents

Abstract

The present invention relates to a manufacturing method of a coating liquid applicable to LED radiation plates capable of realizing dust collection prevention and self-cleaning functions and providing excellent durability and electrostatic shielding properties and, more specifically, to a manufacturing method of a coating liquid applicable to LED radiation fins for 100 W which adds an organic or inorganic binder to a solution in which a carbon nanotube (CNT) is dispersed to manufacture a coating liquid, sprays the coating liquid on LED heat radiation fins, and then thermally cures and dries the coating liquid so as to increase hydrophobicity and surface resistance, thereby realizing dust collection and self-cleaning functions and having excellent durability and electrostatic shielding properties.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coating liquid applicable to an LED heat dissipation fin having a dust collecting prevention function and a self-cleaning function,

[0001] The present invention relates to a coating liquid and a method of manufacturing the same, which can be applied to a radiating fin or heat sink for LED having excellent durability and electrostatic shielding characteristics, and more particularly to a carbon nano tube ), A coating solution containing an organic or inorganic binder, a method for producing the coating solution, and a method of applying the coating solution to an LED heat-dissipating fin or a heat dissipating plate by spraying and thermosetting to improve hydrophobicity and surface resistance, To a method of manufacturing a heat dissipation fin or a heat dissipating plate for a 100 W class LED, which has a durability and an electrostatic shielding characteristic by implementing dust collecting prevention and self cleaning function through the surface.

The 100W LED heat sink, which has been used in existing buildings and factories, has no dust collecting and self-cleaning functions, and the heat dissipation effect is extremely reduced due to exposure to fine dust and other contaminants over time. As a result, the lifetime (durability) of the LED for 100W is decreased, and there is a problem that a fire is caused by a high heat of the LED for 100W at the time of leaving and a tracking phenomenon after an insulation breakdown.

In order to prevent the above-mentioned phenomenon, there is a problem that it is necessary to stop the production line at the time of work as well as the cleaning cost.

In order to prepare a coating liquid for a heat dissipation pin having a dust collecting prevention function and a self-cleaning function, it is necessary to prepare a coating liquid containing various nanomaterials which reduce the surface resistance by realizing hydrophobicity by controlling surface roughness as well as surface energy.

As a result, the present inventors have made efforts to prevent dust collecting and self-cleaning of LED heat-radiating fins or heat sinks, and as a result, they have found that a solution in which carbon nanotubes (CNTs) are dispersed and an organic or inorganic binder are added and sprayed on the LED heat- The present invention has been accomplished by developing a heat dissipation fin or a heat dissipating plate for an LED which has improved durability and electrostatic shielding property by improving the hydrophobicity and surface resistance by thermosetting,

Japanese Patent Registration No. 5330336 U.S. Patent No. 9562284 United States Patent Publication No. 2011-0214285 Korean Patent Publication No. 10-2017-0035029

It is an object of the present invention to provide a solution in which carbon nanotubes (CNTs) are dispersed and an organic or inorganic binder, and is applied to heat-generating fins or heat sinks for LEDs to realize dust collection prevention and self-cleaning functions and improve durability and electrostatic shielding And a process for producing the same.

It is another object of the present invention to provide a method of manufacturing a semiconductor device, which comprises adding a solution of a carbon nanotube (CNT) dispersed therein and an organic or inorganic binder to the LED heat-dissipating fins, spraying the heat- And has excellent durability and electrostatic shielding characteristics, and a method of manufacturing the same.

In order to achieve the above object,

i) acid-treating the carbon nanotubes by immersing the carbon nanotubes in an acid;

ii) dispersing the acid-treated carbon nanotubes in an organic solvent to prepare a carbon nanotube dispersion;

iii) mixing a carbon nanotube dispersion with one or both of an inorganic binder and an organic binder, and an additive to prepare a coating solution; And

iv) spray coating the coating liquid onto the LED radiating fin or the heat sink, and thermally curing the coating;

The present invention provides a method of manufacturing an LED heat dissipation fin or a heat dissipation fin that realizes a dust collecting prevention and self-cleaning function including excellent durability and electrostatic shielding characteristics.

In addition,

i) acid-treating the carbon nanotubes by immersing the carbon nanotubes in an acid, and then dispersing the acid-treated carbon nanotubes in an organic solvent to prepare a carbon nanotube dispersion. Then, an inorganic binder or an organic binder Or a mixture of one or both of the additive and the additive to prepare a first layer coating liquid;

(ii) dispersing the carbon nanotubes in an organic solvent to prepare a carbon nanotube dispersion, and then mixing the carbon nanotube dispersion with one or both of an inorganic binder and an organic binder and additives to prepare a second layer coating solution Producing;

iii) spraying a first layer coating liquid on the LED radiating fins or the heat sink, spraying and coating the first layer coating liquid with a second layer coating liquid; And

iv) thermally curing the coated LED radiating fin or heat sink;

The present invention provides a method of manufacturing an LED heat dissipation fin or a heat dissipation fin that realizes a dust collecting prevention and self-cleaning function including excellent durability and electrostatic shielding characteristics.

Also, the present invention provides an LED heat dissipation fin or a heat dissipation plate which realizes dust collection prevention and self-cleaning function manufactured by any one of the manufacturing methods according to the present invention and has excellent durability and electrostatic shielding characteristics.

The present invention also relates to an LED light emitting diode package for realizing dust collection prevention and self-cleaning function, including one or both of a carbon nanotube dispersion, an inorganic binder or an organic binder, and an additive and providing excellent durability and electrostatic shielding characteristics Thereby providing a coating liquid for a fin or a heat sink.

In addition,

i) acid-treating the carbon nanotubes by immersing the carbon nanotubes in an acid;

ii) dispersing the acid-treated carbon nanotubes in an organic solvent to prepare a carbon nanotube dispersion; And

iii) mixing one or both of an inorganic binder or an organic binder and an additive in the carbon nanotube dispersion;

The present invention provides a method of manufacturing a coating liquid for an LED radiating fin or a heat sink, which realizes dust collection prevention and self-cleaning function and provides excellent durability and electrostatic shielding property.

In addition, the present invention provides a method of spraying a coating liquid according to the present invention onto an LED heat-dissipating fin or a heat dissipating plate to realize a dust-collecting prevention function and a self-cleaning function of an LED heat dissipating fin or a heat dissipating plate and providing excellent durability and electrostatic shielding property .

The present invention can improve the hydrophobicity and surface resistance by spraying a coating solution prepared by adding a solution of a carbon nanotube (CNT) and an organic or inorganic binder to an LED radiating fin or a heat sink, It is possible to realize dust collecting prevention and self-cleaning function of a fin or a heat sink, and excellent durability and electrostatic shielding property can be obtained.

The coating solution according to the present invention forms a hierarchical structure that forms a nano-structure on the micro-structure surface to realize a super water-repellent surface of 150 DEG or more, By having a surface resistance of 10 ³ Ω / sq or less by containing a carbon material, it is possible to prevent dust collecting and self-cleaning of heat dissipation fins or heat sinks for LEDs, and have excellent durability and electrostatic shielding characteristics.

FIG. 1 is a SEM photograph of the coating film of Example 3: (a) 100 magnification, (b) 500 magnification, (c) 10K magnification, and (d) 20K magnification.
2 is a view showing a result of photographing the inside of water drops of the coating film of Example 3. Fig.
3 is a view showing a result of measurement of the contact angle of Example 3. Fig.
4 is a graph showing the result of measurement of the contact angle of Example 4. FIG.
5 is a SEM photograph showing the coating film of Example 4: (a) 50 magnification, (b) 400 magnification, (c) 1K magnification, and (d) 10K magnification.
6 is a cross-cut test result of Example 1 and Comparative Example 1: (a) Comparative Example 1 before cross-cut, (b) Comparative Example 1 after tape cross-cut, and (c) Example 1 Before a cross cut, (d) Tape after Example 1 cross cut.
Fig. 7 (a) is a view showing the water droplet on the surface of the non-fluorine coating layer of Comparative Example 2 and (b) the water droplet on the surface of the fluorine coating layer of Example 1. Fig.
8 is a graph showing the change in contact angle according to the spray spacing of Comparative Example 3. Fig.

Hereinafter, the present invention will be described in detail.

In the present invention, a solution in which carbon nanotubes (CNTs) are dispersed and a coating solution to which an organic or inorganic binder is added is sprayed on an LED radiating fin or a heat sink, followed by thermosetting and then drying to improve hydrophobicity and surface resistance Provided is a method of manufacturing a heat dissipation fin or a heat dissipation plate for an LED which realizes dust collection prevention and self cleaning function and has excellent durability and electrostatic shielding property.

Specifically,

i) acid-treating the carbon nanotubes by immersing the carbon nanotubes in an acid;

ii) dispersing the acid-treated carbon nanotubes in an organic solvent to prepare a carbon nanotube dispersion;

iii) mixing a carbon nanotube dispersion with an inorganic binder, an organic binder or an organic hybrid binder to prepare a coating solution; And

iv) spraying the coating liquid onto the LED radiating fin or the heat sink, thermosetting and drying the coating;

. ≪ / RTI >

In the above manufacturing method, the carbon nanotubes of step i) may be single wall carbon nanotubes (SWCNTs), double wall carbon nanotubes (DWCNTs) and multi wall carbon nanotubes carbon nanotubes (MWCNT), and more preferably multi wall carbon nanotubes (MWCNT), but the present invention is not limited thereto.

The acid treatment solution of step i) may be any one or more selected from the group consisting of nitric acid, sulfuric acid, hydrochloric acid, phosphoric acid and perchloric acid More preferably a mixture of sulfuric acid and nitric acid, but is not limited thereto.

The composition of the acid treatment solution in step i) is preferably 10 to 100 ml per 1 g of carbon nanotubes, and more preferably 30 to 70 ml per 1 g of carbon nanotubes.

In the above manufacturing method, the carbon nanotube dispersion may be prepared by adding carbon nanotubes not subjected to further acid treatment to the acid-treated carbon nanotubes in the step ii).

The organic solvent of step ii) may be selected from the group consisting of isopropyl alcohol (IPA), acetone, N, N-dimethylformamide (DMF), N, N-dimethylacetamide N-dimethylacetamide, DMA), N, N-diethylacetamide (DEA), N, N-dimethylpropanamide (DMP), ethanol, methanol, isopropanol, , 2-dichlorobenzene, chloroform, and dimethylformamide, and is more preferably one or more of IPA, but is not limited thereto.

The carbon nanotube dispersion of step ii) preferably has a composition of carbon nanotubes of 0.1 to 3.0% by weight, more preferably 0.5 to 2.0% by weight, based on the organic solvent.

The dispersion method of step ii) may be any one selected from the group consisting of ultrasonic dispersion, ball-mill dispersion, mechanical stirring, magnetic stirring, acid treatment dispersion, and dispersion using a dispersing agent And it is more preferable to carry out by ultrasonic dispersion.

In the above production method, the organic binder in the step iii) is preferably an acrylic organic binder, but is not limited thereto.

The inorganic binder in step iii) is preferably one or more selected from the group consisting of dimethylbenzene, titanium dioxide, silicon dioxide, organic ceramic resin, It is not limited.

The additive of step iii) is preferably a fluorine-based silane.

The fluorine-based silane may be at least one selected from the group consisting of trimethoxy (3,3,3-trifluoropropyl) silane, trimethoxy (1H, 1H, 2H, 2H nonafluorohexyl) (1H, 1H, 2H, 2Hnonafluorohexyl) silane), trichloro (1H, 1H, 2H, 2Hnonafluorohexyl) silane), triethoxy 2H, tridecafluoro-n-octyl) silane), triethoxy-1H, 1H, 2H, 2H tridecafluoro- (1H, 1H, 2H, 2Hheptadecafluorodecyl) silane (Trichloro (1H, 1H, 2H, 1H) , 1H, 1H, 2H, 2H trimethylsilane), trimethoxy (1H, 1H, 2H, 2H heptadecafluorodecyl) silane), triethoxy-1H, 1H, 2H, 2H heptadecafluorodecylsilane (Triethoxy-1H, 1H, 2H, 2Hheptadecafluorodecylsilane), pentafluorophenyldimethyl But are not limited to, pentafluorophenyldimethylchlorosilane, pentafluorophenylethoxydimethylsilane, chlorodimethyl [3- (2,3,4,5,6-pentafluorophenyl) propyl] silane (chlorodimethyl [3- (Trichloro [3- (pentafluorophenyl) propyl] silane), and trimethoxy (11- (11-pentafluorophenoxyundecyl) silane), and one or more selected from the group consisting of trimethoxy (3,3,3-trifluoropropyl) silane (Trimethoxy (1H, 2H, 2H nonafluorohexyl) silane), triethoxy (1H, 2H, 2H nonafluorohexyl) silane, 1H, 1H, 2H, 2H trinodecafluoro) silane) and trichloro (1H, -n- octyl) one the one or more than one selected from the group consisting of silane and more preferably is not limited to this.

In the step iii), the carbon nanotube dispersion, the organic binder and the additive are preferably added in an amount of 65 to 90 wt%, 5 to 30 wt% and 0.1 to 10 wt%, respectively, and 70 to 85 wt%, 10 to 25 wt% wt.% and 1 to 10 wt%, based on the total weight of the composition.

In the above manufacturing method, the type of the spray in the step iv) is a press-feed type, a gravity type, a suction type or an automatic type, and the types of the spray nozzle include a flat fan, a full cone, cone or straight.

The application of the spray of the step iv) preferably has a nozzle tilt angle of 5 to 25 °, a nozzle height of 150 to 300 mm, and more preferably 200 to 250 mm.

In the step iv), spraying is preferably applied two to five times, more preferably three to four times.

The thermosetting in step iv) is preferably carried out in an atmosphere at a temperature of from 100 to 200 캜, and more preferably in an atmosphere of from 150 to 170 캜.

In addition,

i) acid-treating the carbon nanotubes by immersing the carbon nanotubes in an acid, and then dispersing the acid-treated carbon nanotubes in an organic solvent to prepare a carbon nanotube dispersion. Then, an inorganic binder or an organic binder Or a mixture of one or both of the additive and the additive to prepare a first layer coating liquid;

(ii) dispersing the carbon nanotubes in an organic solvent to prepare a carbon nanotube dispersion, and then mixing the carbon nanotube dispersion with one or both of an inorganic binder and an organic binder and additives to prepare a second layer coating solution Producing;

iii) spraying a first layer coating liquid on the LED radiating fins or the heat sink, spraying and coating the first layer coating liquid with a second layer coating liquid; And

iv) thermally curing and drying the coated LED radiating fin or heat sink;

The present invention provides a manufacturing method of an LED heat generating fin or a heat sink having an excellent durability and an electrostatic shielding property.

In the above production method, the types and compositions of carbon nanotubes, acids, organic solvents, organic binder, and additives in steps i) to ii) are the same as those described above.

In the above-mentioned production method, the order of steps i) to ii) may be produced sequentially or simultaneously, irrespective of whether the first layer coating solution is applied and the second layer coating solution is prepared have.

In the above-mentioned production method, the spray application and thermal curing of steps iii) to iv) are the same as described above.

Also, the present invention provides an LED heating pin or a heat sink having an anti-dust and self-cleaning function manufactured by any one of the manufacturing methods according to the present invention and having excellent durability and electrostatic shielding characteristics.

The LED heating fins or heat sinks are preferably used for high power LEDs, that is, for 50 to 300 W class LEDs, and more preferably for 100 W class LEDs.

The present invention also relates to an LED light emitting diode package for realizing dust collection prevention and self-cleaning function, including one or both of a carbon nanotube dispersion, an inorganic binder or an organic binder, and an additive and providing excellent durability and electrostatic shielding characteristics Thereby providing a coating liquid for a fin or a heat sink.

The carbon nanotube dispersion may be an acid-treated carbon nanotube alone, or a dispersion in which carbon nanotubes not acid-treated with acid-treated carbon nanotubes are further dispersed.

The additive is preferably a fluorine-based silane. The additive is preferably trimethoxy (3,3,3-trifluoropropyl) silane, trimethoxy (1H, 1H, 2H, 1H, 2H, 2Hnonafluorohexyl) silane), triethoxy (1H, 1H, 2H, 2H nonafluorohexyl) silane (Triethoxy silane), trichloro (1H, 1H, 2H, 2H tridecafluoro-n-octyl) silane.

The composition of the coating liquid is preferably 65 to 90 wt%, 5 to 30 wt%, and 0.1 to 10 wt%, respectively, and preferably 70 to 85 wt%, 10 to 10 wt%, respectively, of the carbon nanotube dispersion, the organic binder, 25 wt% and 1 wt% to 10 wt%.

The coating solution forms a hierarchical structure that forms a nano-structure on the surface of a micro-structure to realize a super water-repellent surface of 150 ° or more and contains a carbon material having excellent electrical conductivity. By having a surface resistance of ³ Ω / sq or less, excellent self-cleaning and electrostatic shielding characteristics can be realized, and excellent durability and electrostatic shielding characteristics can be obtained.

In addition,

i) acid-treating the carbon nanotubes by immersing the carbon nanotubes in an acid;

ii) dispersing the acid-treated carbon nanotubes in an organic solvent to prepare a carbon nanotube dispersion; And

iii) mixing one or both of an inorganic binder or an organic binder and an additive in the carbon nanotube dispersion;

The present invention provides a method of manufacturing a coating liquid for an LED radiating fin or a heat sink, which realizes dust collection prevention and self-cleaning function and provides excellent durability and electrostatic shielding property.

In the above production method, the kinds and compositions of the carbon nanotubes, the acid, the organic solvent, the organic binder, and the additive are the same as those described above.

In addition, the present invention provides a method of spraying a coating liquid according to the present invention onto an LED heat-dissipating fin or a heat dissipating plate to realize a dust-collecting prevention function and a self-cleaning function of an LED heat dissipating fin or a heat dissipating plate and providing excellent durability and electrostatic shielding property .

The coating solution forms a hierarchical structure that forms a nano-structure on a micro-structure surface in use, realizes a super water-repellent surface of 150 ° or more, and contains a carbon material having excellent electrical conductivity By having a surface resistance of 10 ³ Ω / sq or less, self-cleaning and electrostatic shielding properties can be improved remarkably.

A preferred embodiment of the present invention is as follows. The following embodiments are illustrative of the technical features of the present invention, and the present invention is not limited to these embodiments.

< Example  1> MWCNT , Organic binders and fluorine-based Silane  Coating with coating fluid

10 g of multiwalled carbon nanotubes (MWCNT) were immersed in 500 ml of an acid treatment solution of H ₂ SO ₄ : HNO ₃ in a volume ratio of 3: 1, and then immersed in a probe sonicator (500 watt, 20 KHz, 25% generating capacity), and acidified MWCNT was obtained by neutralization after acid treatment. 1 to 3 g of acidified MWCNT was immersed in 200 ml of IPA solution and ultrasonically dispersed for 16 to 23 minutes through a probe ultrasonic wave crusher (500 watt, 20 KHz, 25% generating capacity). 70 to 85 wt% of ultrasonic dispersed MWCNT dispersion, 10 to 25 wt% of organic binder and 1 to 10 wt% of fluorine silane were added and magnetic stirring was performed for 10 minutes to prepare a coating solution for preventing dust collection and self cleaning.

The coating solution for prevention of dust collection and self-cleaning was sprayed by gravity spray coating at air inlet pressure (0.4-0.6 MPa), full cone nozzle, nozzle tilt degree 15 ± 7 °, nozzle height 200 mm 3 times. The applied coating layer was thermally cured in an atmosphere of 150 캜 to secure a coating film.

< Example  2> MWCNT , Inorganic binders and fluorine-based Silane  Coating with coating fluid

3 g of the acidified MWCNT of Example 1 was immersed in 200 ml of IPA at 97.0 wt% to 99.0 wt%, and then immersed in a probe sonicator (500 watt, 20 KHz, 25% generating capacity) For 23 minutes. 70 to 85 wt% of ultrasonic dispersed MWCNT dispersion, 10 to 25 wt% of inorganic binder and 1 to 10 wt% of fluoric silane were added and magnetic stirring was performed for 10 minutes to prepare a coating solution for prevention of dust collection and self-cleaning.

The gravity prevention and self-cleaning coating solution was sprayed by gravity spray coating at an air inlet pressure of 0.4-0.6 MPa, a full cone nozzle, a nozzle tilt degree of 15 ± 7 °, a nozzle height of 200 mm 3 times. The applied coating layer was thermally cured in an atmosphere of 150 캜 to secure a coating film.

< Example  3> MWCNT  And a single-layer coating liquid containing an organic binder, and MWCNT , An organic binder, and a fluorinated silane

The acidified MWCNT of Example 1 was immersed in 97.0 wt% to 99.0 wt% of IPA and dispersed through a probe sonicator (500 watt, 20 KHz, 25% generating capacity) for 40 minutes. Ultrasonic dispersed MWCNT dispersion of 50 ~ 65 wt% and 10 minutes magnetic stirring in an organic binder was added to 35 ~ 50 wt% (magnetic stirring ) to prevent dust and self-cleaning for the first layer (1 ^st layer) coating solution was prepared.

MWCNT was immersed in 97.0 wt% to 99.0 wt% of IPA and then ultrasonically dispersed for 20 to 27 minutes using a probe sonicator (500 watt, 20 KHz, 25% generating capacity). A second layer (2 ^nd layer) for prevention of dust collection and self-cleaning was prepared by magnetic stirring for 10 minutes by adding 70 ~ 85 wt% of ultrasonic dispersed MWCNT dispersion, 10 ~ 25 wt% of organic binder and 1 ~ 10 wt% To prepare a coating solution.

For combined dust prevention and self cleaning 1 ^st , 2 ^nd The coating solution was applied by spraying a gravitational spray coating twice with a 1 ^st coating solution at an air inlet pressure (0.4-0.6 MPa), a discharge amount, a full cone nozzle, a nozzle tilt degree of + 15 ° and a nozzle height of 200 mm Then, 2 ^nd coating liquid was applied and coated. The applied coating layer was thermally cured in an atmosphere of 150 캜 to secure a coating film.

< Example  4> MWCNT  And an inorganic binder, and MWCNT , Inorganic binders and fluorine-based Silane  Coating with two-layer coating fluid

The acidified MWCNT of Example 1 was immersed in 97.0 wt% to 99.0 wt% of IPA and then dispersed by a probe sonicator (500 watt, 20 KHz, 25% generating capacity) for 40 minutes. 50-65 wt% of ultrasonic dispersed MWCNT dispersion and 35-50 wt% of inorganic binder were added and magnetic stirring was performed for 10 minutes to prepare a 1 ^st layer coating solution for prevention of dust collection and self-cleaning.

MWCNT was immersed in 97.0 wt% to 99.0 wt% of IPA and then ultrasonically dispersed for 20 to 27 minutes using a probe sonicator (500 watt, 20 KHz, 25% generating capacity). A second layer (2 ^nd layer) for prevention of dust collection and self-cleaning was prepared by magnetic stirring for 10 minutes by adding 70 ~ 85 wt% of ultrasonic dispersed MWCNT dispersion, 10 ~ 25 wt% of inorganic binder and 1 ~ 10 wt% of fluoric silane, To prepare a coating solution.

For combined dust prevention and self cleaning 1 ^st , 2 ^nd The coating solution was applied by spraying a gravitational spray coating twice with a 1 ^st coating solution at an air inlet pressure (0.4-0.6 MPa), a discharge amount, a full cone nozzle, a nozzle tilt degree of + 15 ° and a nozzle height of 200 mm Then, 2 ^nd coating liquid was applied and coated. The applied coating layer was thermally cured in an atmosphere of 150 캜 to secure a coating film.

< Comparative Example  1> Binder and Fluorine Silane  Coating with coating liquid

IPA 97.0 wt% to 99.0 wt% of MWCNT was immersed in the solution, ultrasonically dispersed for 40 minutes through a probe sonicator (500 watt, 20 KHz, 25% generating capacity), sprayed by gravity, Was coated with air inlet pressure (0.4-0.6 MPa), full cone nozzle, nozzle tilt degree 15 ± 7 °, nozzle height 200 mm, and coated once. The coated side was dried to obtain a coating film.

< Comparative Example  2> Fluorine Silane  Coating with coating liquid

After immersing 10 g of MWCNT in 500 ml of acid treatment solution made of H ₂ SO ₄ : HNO ₃ 3: 1, ultrasonic dispersion was carried out using a probe sonicator (500 watt, 20 KHz, 25% generating capacity) And neutralized to obtain acidified MWCNT. 1 to 3 g of acid-treated MWCNT was immersed in 200 ml of IPA solution and ultrasonically dispersed through a probe sonicator (500 watt, 20 KHz, 25% generating capacity) for 16 to 23 minutes. 70 ~ 85 wt% of ultrasonic dispersed MWCNT dispersion and 10 ~ 25 wt% of organic binder were added and magnetic stirring was performed for 10 minutes to prepare a coating solution for prevention of dust collection and self cleaning.

The spraying of gravity-protected and self-cleaning coating solution was carried out by spray coating with air inlet pressure (0.4-0.6 MPa), discharge amount, full cone nozzle, nozzle tilt degree 15 ± 7 °, nozzle height 200 lt; RTI ID = 0.0 &gt; mm. &lt; / RTI &gt; The applied coating layer was thermally cured in an atmosphere of 150 캜 to secure a coating film.

 < Comparative Example  3> When applying spray Distance  Modified Coating

When the coating liquid of Example 2 was applied by spray coating, the nozzle height was 200 mm and 400 mm at the air inlet pressure (0.4-0.6 MPa), full cone nozzle, nozzle tilt degree + 15 °, Sprayed once to coat the surface of the coating film according to the separation distance. The applied coating layer was thermally cured in an atmosphere of 150 캜 to secure a coating film.

< Experimental Example  1>

The <Example 1> of the result, the contact angle is 152 ° 10 ^{4. 5} Ω / sq surface resistivity of, for pencil hardness, within 5% of the cross cut test 2H, heat-resistant (80 ± 2) ℃ 120hr test when no abnormality, (80 ± 2) ° C, (80 ± 3)% RH 120hr. It was confirmed that the test was applicable to a place where a thin coating layer having flexibility and flexibility and super-water repellency was required.

As a result of <Example 2>, the contact angle was 155 ° or more, surface resistance of 10 ^{3 5} Ω / sq, pencil hardness of 4H, cross cut test within 5%, heat resistance (80 ± 2) (80 ± 2) ° C, (80 ± 3)% RH 120hr It was confirmed that there is no abnormality in the test, and it is confirmed that it is applicable to a place where a thin coating layer having rigidity and super water repellency is required.

The <Example 3> of the result, the contact angle is more than 150 °, 10 ^{5. 5} Ω / sq surface resistivity of the, pencil hardness of 5H, less than 5% cross cut test, heat-resistant (80 ± 2) ℃ 120hr test Abnormal (80 ± 2) ° C, (80 ± 3)% RH 120hr Measured with no abnormality during testing, flexible, applicable to applications requiring thick coatings with super water repellency and slight hardness Respectively.

As shown in FIG. 1, SEM image capturing showed that protrusions having a size of 5 μm to 30 μm were formed on the surface of a 50 × magnification photograph (a) observation result. (B) Observation results confirmed that protrusions of 1 to 10 μm were formed on the protrusions of 5 to 30 μm. (C) Observation Result It was confirmed that roughness was formed on the surface of the protrusion of 1 ~ 10 ㎛ in size. (D) Observation result showed that the protrusion of 1 ~ 10 ㎛ protrusion was composed of composite of MWCNT and organic binder Respectively. As a result, clusters of 5 ~ 30 ㎛ structures were observed and observed on the surface of microstructures in the form of hierarchical structures surrounded by structures of 1 ~ 10 ㎛ (Fig. 1).

As shown in FIG. 2, it was confirmed that water repellency of the cassie-baxter model was observed as a result of photographing the inside of the water drop (FIG. 2).

As shown in FIG. 3, it was confirmed that the contact angle measurement of Example 3 realizes a super water-repellent surface of 155 ° or more (FIG. 3).

As a result of the above Example 4, the surface resistance of 10 ^{3 0} Ω / sq, the pencil hardness of 7H, the cross cut test within 5%, the heat resistance (80 ± 2) (80 ± 2) ° C, (80 ± 3)% RH 120hr It is possible to apply it where a thick coating layer which is rigid and has super water repellency and hardness is measured as having no abnormality in the test .

As shown in FIG. 5, it was confirmed by SEM image capturing that protrusions of the order of 10 μm to 100 μm were formed on the surface of the observation image (a) at a magnification of 100 magnification. 500 magnification images (b) Observation results confirmed that protrusions of 1 to 50 μm were formed on the protrusions of 10 to 100 μm. (C) Observation Results It was confirmed that roughness was formed on the surface of the protrusion of 1 ~ 50 ㎛ level. (D) The enlargement of 10K magnification. (D) The protrusion of 1 ~ 50 ㎛ level was composed of MWCNT and binder Respectively. As a result, a cluster structure of a 500 탆 structure was observed and observed on a microstructure surface in the form of a hierarchical structure surrounded by structures of 1 to 50 탆 (Fig. 5).

As shown in Fig. 3, the water droplets were dropped on the super water-repellent surface, and the water droplets were supported only on the peaks according to the surface roughness, as shown in Fig.

As a result of the above <Comparative Example 1>, the contact angle was the highest 163 ° and the surface resistance was 10 ^2.0 Ω / sq, while the surface hardness was 0, (Fig. 6). Therefore, in Comparative Example 1, it was confirmed that the coating layer was free from external impact and applicable to the inside of a device requiring self-cleaning.

As a result of the Comparative Example 2, it was confirmed that the coating liquid in which the fluorine-based silane was not used was not a super water-repellent surface at 121 ° as shown in FIG. 7 (a).

As a result of performing the same processes except for the separation distance when spraying with the same material as in the above-mentioned <Comparative Example 3>, the degree of homogeneous coating of the coating liquid was different according to the separation distance as shown in FIG. 8, (Fig. 8).

As shown in Table 1 below, the coating composition and the physical property changes according to the process were analyzed. As a result, it was found that the organic binders of Examples 1 and 3 can be applied to flexible materials, 2 and 4 were applicable to rigid materials.

Examples 1 and 2 having a single layer structure can be applied to products requiring a coating layer having a thin and excellent thermal conductivity. Examples 3 and 4 having a multi-layer structure are applicable to products requiring coating layer durability rather than thermal conductivity .

In the blank of the comparative example, the data can not be measured and is left blank, and it is confirmed that the comparative example is superior to the comparative example.

Changes in physical properties of coating compositions and processes division Example 1 Example 2 Example 3 Example 4 Comparative Example 1 Comparative Example 2 Comparative Example 3 Separation distance
200 mm Separation distance
400 mm Contact angle
(°) 152 155 150 157 163 121 141 97 Surface resistance
(Ω / sq) 10 ^4.5 10 ^3.5 10 ^5.5 10 ^3.0 10 ^2.0 10 ^4.5 - - Coating thickness
(탆) 23.1 22.3 43.2 41.8 19.8 21.6 - - Surface hardness
(H) One 3 4 7 0 2 - - crosscut
(%) Within 5 Within 5 Within 5 Within 5 Within 5 Within 5 - - Application site inside inside Out Out - - - - Base type flexible rigid flexible rigid - - - - Heat resistance
(80 ± 2) ° C
120hr clear clear clear clear - - - - inroad
(80 ± 2) ° C
(80 ± 3)%
RH
120hr clear clear clear clear - - - -

Claims (8)

i) acid-treating the carbon nanotubes by immersing the carbon nanotubes in an acid;
ii) dispersing the acid-treated carbon nanotubes and the acid-untreated carbon nanotubes in an organic solvent to prepare a carbon nanotube dispersion;
iii) mixing a carbon nanotube dispersion with one or both of an inorganic binder and an organic binder, and an additive to prepare a coating solution; And
iv) spraying the coating liquid onto the LED radiating fin or the heat sink, thermosetting and drying the coating;
Wherein the dust-collecting device has a dirt-repellent self-cleaning function and has durability and electrostatic shielding characteristics.
The method according to claim 1,
The carbon nanotubes of step i) may be single wall carbon nanotubes (SWCNTs), double wall carbon nanotubes (DWCNTs), and multi wall carbon nanotubes (MWCNTs). Wherein the heat sink is made of one or more selected from the group consisting of aluminum alloy, aluminum alloy and aluminum alloy.
delete The method according to claim 1,
Wherein the additive in step iii) is a fluorine-based silane.
The method according to claim 1,
Wherein the composition of the additive in the step iii) is 0.1 to 10.0 wt%.
i) acid-treating the carbon nanotubes by immersing the carbon nanotubes in an acid, and then dispersing the acid-treated carbon nanotubes in an organic solvent to prepare a carbon nanotube dispersion. Then, an inorganic binder or an organic binder Or a mixture of one or both of the additive and the additive to prepare a first layer coating liquid;
(ii) dispersing the carbon nanotubes in an organic solvent to prepare a carbon nanotube dispersion, and then mixing the carbon nanotube dispersion with one or both of an inorganic binder and an organic binder and additives to prepare a second layer coating solution Producing;
iii) spraying a first layer coating liquid on the LED radiating fins or the heat sink, spraying and coating the first layer coating liquid with a second layer coating liquid; And
iv) thermally curing and drying the coated LED radiating fin or heat sink;
And a self-cleaning function, and has durability and electrostatic shielding characteristics.



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