WO2011021794A2

WO2011021794A2 - Carbon nanotube/metal particle complex composition and heated steering wheel using same

Info

Publication number: WO2011021794A2
Application number: PCT/KR2010/005041
Authority: WO
Inventors: 김태수; 정용배; 예성훈
Original assignee: ㈜엘지하우시스
Priority date: 2009-08-20
Filing date: 2010-07-30
Publication date: 2011-02-24
Also published as: CN102471050B; DE112010003312T5; CN102471050A; DE112010003312T8; JP5603939B2; JP2013501703A; WO2011021794A3

Abstract

The present invention relates to a carbon nanotube/metal particle complex composition prepared by: a) a step of preparing a carbon nanotube solution in which carbon nanotubes are dispersed; b) a step of performing acid treatment on the carbon nanotube solution prepared in step a); c) a step of neutralizing the carbon nanotube solution prepared in step b); and d) a step of mixing the carbon nanotube solution prepared in step c) and a metal solution containing metal particles, in order to bond said metal particles to the surfaces of said carbon nanotubes. The present invention also relates to a heated steering wheel including a carbon nanotube heating coating layer formed from the composition.

Description

Carbon nanotube-metal particle composite composition and exothermic steering wheel using the same

The present invention relates to an exothermic steering wheel comprising a carbon nanotube-metal particle composite composition and a carbon nanotube exothermic coating layer formed therefrom.

In general, a steering wheel of a vehicle is mounted at one end of a steering shaft connected to a steering gear so that the amount of rotation of the steering wheel is transmitted to the steering gear through the steering shaft, and the steering wheel is normally rotated. Made of lightweight PVC or urethane to improve the driver's grip.

If the steering wheel is parked on the road for a long time in winter, the steering wheel is cooled by the cool air around and the hand is cold when the steering wheel is caught. Cooled by the effect. However, the driver has to wait for a long time until the temperature rises in case of using a hot air heater, and in the case of the wheel cover, there is a problem of insufficient thermal effect, so that a heating steering wheel is built in the steering wheel and a temperature steering means controls the temperature of the steering wheel. Is disclosed.

Conventional heating steering wheel has been disclosed a variety of structures, as shown in Figure 1, wrap the synthetic resin portion 20 formed in the outer portion of the core 10 with a heating pad 30, if necessary, the heating wire The pad 30 is wrapped in a leather or cloth wheel cover 40, wherein the heating pad 30 is a heating wire (heating element 31) is wired and the heating means for controlling the temperature by the temperature controller 32 It is. The heating wire 31 is generally made of a metal heating element such as nichrome wire, a positive temperature coefficiency (PTC) ceramic heating element, or the like.

However, the conventional heating steering wheel has a complicated manufacturing process due to the manufacturing and wrapping process of the heating pad, and the grip is reduced due to the pad (too soft). Since it is formed by a method (a method of dissolving a transfer film in water to transfer a pattern to an object by using a flexible property of water), a pattern transfer layer such as wood or metal cannot be formed on a steering wheel to which a heating pad is attached. In addition, there is a problem that a temperature controller for adjusting the temperature of the heating pad is necessary.

In addition, the conventional heating steering wheel is in direct contact with the tactile sensitive hand, it is preferable to minimize the sudden rise or drop of the temperature by changing the material or the negative resistance value is constantly changing the resistance value. To this end, transparent carbon nanotubes (CNT) can be applied to the heating steering wheel as a heating element.

Herein, dispersion of carbon nanotubes is important, and much research has been made to reduce contact resistance between carbon nanotubes and carbon nanotubes. When the contact resistance between the carbon nanotubes and the carbon nanotubes is reduced, the electrical conductivity is lowered and the transparent electrode material can be used as described below.

Korean Patent Application No. 10-2008-0112799 aims to produce a thin film on a plastic substrate by making a CNT-metal nanoparticle hybrid as a method for reducing contact resistance. The hybrid has been shown to reduce the overall resistance of the carbon nanotube thin film by adsorbing a metal precursor on the surface of the carbon nanotube. In addition, it has been described using a mechanism in which silver nanoparticles grow into clusters on a part of the surface to which silver nanoparticles are adsorbed through heat treatment. In the case of the carbon nanotube-metal nanoparticle mixture thus formed, the resistance value can be reduced, but the silver nanoparticles are difficult to be uniformly adsorbed to the carbon nanotube (CNT) having a stable wall structure, and thus the measured value is not determined for each site. Cause uneven results.

In the case of using the carbon nanotube-metal nanoparticle mixture formed by the adsorption method to use the carbon nanotubes as a heating element, uniform heating properties may be obtained when coating the plastic handle surface having three-dimensional curvature. In this case, it can be seen that the resistance value changes according to continuous On-Off of the power.

The heating handle is in direct contact with the tactile hand and should minimize the rapid rise or fall of the temperature due to material or negative resistance values that constantly change.

When carbon nanotubes are dispersed alone and coated on the heating handles, it is difficult to meet the heating value required by the heating handles due to the high contact resistance. Happens.

If carbon is used without carbon nanotubes, the resistance value is changed by temperature, so it is not suitable for heating handle applications requiring precise temperature control.

The resistance value rises with continuous temperature rise. The constant rise in resistance leads to a decrease in current flow, which eventually leads to a short circuit. A way to prevent this is to use carbon properly to implement complementary properties.

Therefore, the object of the present invention is to solve the above problems, the object of the present invention is a simple manufacturing process, good grip, can form a pattern transfer layer, does not necessarily require a temperature controller and excellent heat transfer efficiency It is to provide a heat steering handle to prevent the heat collection phenomenon.

In addition, the carbon nanotube-metal particle composite composition chemically attaches the metal nanoparticles to the carbon nanotube dispersion solution and has a constant electrical conductivity and is uniformly formed on the front surface, and an exothermic steering wheel whose electrical resistance does not change accordingly. To provide.

In addition, the binder is mixed with the carbon nanotube-metal particle composite composition to form a one-component solution, which is uniformly dispersed and coated on the surface of the plastic handle of the 3D structure to generate heat in a precise temperature range by adhesion to the plastic handle. It has a characteristic, and provides a heat steering handle that does not change the resistance value at a temperature change of less than 160 ℃.

The present invention, a) preparing a carbon nanotube dispersion solution in which carbon nanotubes are dispersed; b) acid treating the carbon nanotube dispersion solution of step a); c) neutralizing the carbon nanotube dispersion solution of step b); And d) mixing the carbon nanotube dispersion solution of step c) with a metal solution including metal particles, thereby bonding the metal particles to the surface of the carbon nanotubes, thereby providing a carbon nanotube-metal particle composite composition. .

The present invention, the core to maintain the steering handle rigidity, the synthetic resin portion formed on the outer side of the core, the carbon nanotube heating coating layer formed by coating the carbon nanotube-metal particle composite composition on the outer surface of the synthetic resin portion, Provided is a heat steering handle including an electrode electrically connected to the carbon nanotube heat coating layer to induce heat generation.

According to the exothermic steering wheel according to the present invention, since the dispersing liquid is sprayed to form the exothermic coating layer, the manufacturing process is simple, and the grip of the exothermic coating layer is good, and a pattern transfer layer such as wood or metal can be formed on the outside of the exothermic coating layer. In addition, the temperature controller is not necessarily required, and the heat transfer efficiency of the heating coating layer is excellent and there is an effect of preventing heat collection.

In addition, a carbon nanotube-metal particle composite composition in which the metal nanoparticles are chemically attached to the carbon nanotube dispersion solution and the electrical conductivity is consistently formed uniformly on the front surface, and an exothermic steering wheel in which the resistance thereof is not changed electrically is used. Is provided.

In addition, the binder is mixed with the carbon nanotube-metal particle composite composition to form a one-component solution, which is uniformly dispersed and coated on the surface of the plastic handle of the 3D structure to generate heat in a precise temperature range by adhesion to the plastic handle. It is characterized in that the heating steering wheel is provided, which does not change the resistance value at a temperature change of less than 160 ℃.

1 is a block diagram of a conventional heating steering wheel.

2 is a plan view of a heat steering handle to which the present invention is applied;

3 is a cross-sectional view taken along the line A-A in FIG.

4 is a cross-sectional view of the heating steering wheel according to another embodiment of the present invention.

5 is a manufacturing process diagram of a heat steering handle to which the present invention is applied.

6 is a manufacturing flow chart of the heating steering wheel applied according to the present invention.

7A is a particle model of a general carbon nanotube heating element.

FIG. 7B is a particle model of a heating element including a carbon nanotube (CNT) and a conductor such as silver (Ag) particles or metal particles.

Fig. 8A is an electrical network model of general carbon.

8B is an electrical network model of carbon nanotubes (CNT).

9 is a diagram showing the procedure of Embodiment 1 of the present invention.

10 is a photograph of the exothermic steering wheel to be coated with the solution of Example 1 and Comparative Examples 1 and 2 of the present invention.

FIG. 11 is a photograph of a finished product leathered to the handle of FIG. 10.

12 is a durability test result of Example 1 according to the present invention.

110: core 120: synthetic resin

130: carbon nanotube heating coating layer 131: electrode

140: cover 150: transfer layer

160: outer coating layer

Carbon nanotube-metal particle composite composition according to the present invention comprises the steps of: a) preparing a carbon nanotube dispersion solution in which carbon nanotubes are dispersed; b) acid treating the carbon nanotube dispersion solution of step a); c) neutralizing the carbon nanotube dispersion solution of step b); And d) mixing the carbon nanotube dispersion solution of step c) with a metal solution including metal particles, thereby bonding the metal particles to the surface of the carbon nanotubes.

Here, the carbon nanotube of step a), MWNT (multi wall nanotube); Thin wall nanotube (TWNT); And one or more selected from single wall nanotubes (SWNTs).

The dispersion solution in step a) may be prepared by dispersing the carbon nanotubes in a solvent.

In step b), one or more selected from nitric acid, sulfuric acid, hydrochloric acid, and perchloric acid may be added to the acid treatment.

In step c), at least one selected from an aqueous sodium hydroxide solution, an aqueous potassium hydroxide solution and an aqueous ammonium hydroxide solution may be added for neutralization.

In general, acid treatment of carbon nanotubes generates random carboxyl groups, and at the same time, the pH is lowered, resulting in acidification. When used by filtration, the electrical conductivity is deteriorated because a myriad of defects are present in the carbon nanotube molecular structure attacked by acid. In order to solve this problem, in the present invention, the neutralization treatment is performed to reduce the pH to 6 or more. Preferably the pH is 7.

Even if only carbon nanotubes are filtered after the acid treatment, since a small amount of acidic ions are present in the vicinity, metal nanoparticles can be easily oxidized by the residue. Pure metal nanoparticles are obtained and mixed with the acid-treated carbon nanotubes. Thus, when the metal nanoparticles are mixed with the carbon nanotubes without considering pH, the metal nanoparticles are produced by coulomb force. There is room for oxidation by residual acidic ions before physical adsorption.

Therefore, in the present invention, in order to chemically attach the metal particles to the carbon nanotubes into which the carboxyl group is introduced, the metal particles are neutralized so as not to be attacked by acidic ions, and then the carbon nanotubes are stabilized and the metal particles are chemically In the process of binding, acidic ions do not participate in the reaction.

In step c), the carbon nanotube dispersion solution of step b) and at least one selected from sodium hydroxide solution, potassium hydroxide solution and ammonium hydroxide solution may be mixed using ultrasonic waves.

The metal solution containing the metal particles in step d), a solvent; 1 type selected from TOAB, 1,2-dichlorobenzene, N-methylpyrrolidone (NMP: N-methlypyrrolidone) and N, N-dimethylformamide (DMF: N, N-dimethylformamide) A solution in which formaldehyde or acetaldehyde is mixed; And at least one metal salt selected from salts of Ag, Pt, Pd, Au, Cu, Ni, Al, Ag / Cu, Ag / Ni.

Specific examples of the metal salts include AgCl, AgI, AgBr, AgNO ₃ , AgCN, and KAg (CN) ₂ , but are not limited thereto. The metal salt may be dissolved in HNO ₃ aqueous solution and then added with a small amount of NH ₃ . desirable.

The metal particles on the surface of the carbon nanotubes in step d) may be at least one selected from Ag, Pt, Pd, Au, Cu, Ni, Al, Ag / Cu, Ag / Ni, and Cu / Ni. Further, the metal particles on the surface of the carbon nanotubes are preferably 10 to 300 nm in diameter.

The solution of step d) is MEK, MIBK, acetone (acetone), cyclohexanone (cyclohexanone), ketone-based solution, butoxyethyl acetate (butoxyethyl acetate), butyl carbitol acetate (BCA: butyl cabitol acetate) and acetate Dispersing at least one selected from the solutions to prepare a dispersion solution; And it may further comprise the step of mixing the dispersion solution and the binder.

Here, the binder may be at least one selected from a polyurethane resin, a poly ester resin, and an acrylic resin.

실시예 1Example 1

2 mg of MWNT (multi wall nanotube) was placed in 100 ml of distilled water and a glass beaker and physically dispersed at 15,000 psi using a Microfluidizer (M-110S) to obtain a CNT dispersion solution. The aqueous solution of sulfuric acid and nitric acid mixed 3: 1 was ultrasonically mixed with a Sonicator (ULH-700) for 1 hour.

Next, the mixture was neutralized with aqueous NaOH solution, mixed with 10 ml of TOAB, 10 ml of toluene, and 1 ml of acetaldehyde in DMF aqueous solution, 0.1 g of AgCl was added to the aqueous nitric acid solution, and then concentrated NH ₃ was slowly added to the mixture, including RX. Prepare the solution. Thereafter, the mixed solution containing RX was mixed with MWNT containing NaOH and mixed at 80 ° C. for 3 hours to perform a Phase Transfer Reaction, thereby allowing Ag particles to precipitate on the CNT surface. The reacted solution was filtered through an aluminum membrane (anodisc, 200 nm) using a filtration device, dispersed in a MEK solution, and then mixed by adding a binder (LG Chemical EXP-7) to the carbon nanotube-metal particle composite according to the present invention. A composition was prepared (see FIG. 9).

비교예 1Comparative Example 1

2 mg of MWNT (multi wall nanotube) was placed in 100 ml of distilled water and a glass beaker and physically dispersed at 15,000 psi using a Microfluidizer (M-110S) to obtain a CNT dispersion solution. 10 ml of NMP (n-methylpyrrolidone) was added thereto, followed by ultrasonic mixing with a Sonicator (ULH-700) for 10 hours.

This was filtered through a filter through an aluminum membrane (anodisc, 200 nm), followed by filtering through a prepared silver precursor solution (prepared by mixing 5 g of silver nitrate and 4.5 ml of butylamine in 60 ml of toluene) to filter CNT-metal nanoparticles. Hybrids were prepared.

After heat treatment at 120 ° C. or below for 2 hours, it was dispersed in MEK solution, and then mixed with the addition of a binder (LG Chemical EXP-7) to prepare a CNT-metal nanoparticle mixture solution.

비교예 2Comparative Example 2

2mg of MWNT (multi wall nanotube) was added to a glass beaker with 100ml MEK, and physical dispersion was performed at 15,000psi using a Microfluidizer (M-110S) to obtain a CNT dispersion, and then a binder (LG Chem. EXP-7) was added. The solution was prepared.

실험예 1Experimental Example 1

The solutions of Example 1 and Comparative Examples 1 and 2 were uniformly spray coated on the surface of the plastic handle (Urethane) having a 3D shape. After drying for 2 hours at 100 ℃ or less in consideration of the deformation deformation temperature of the urethane handle, the measurement was repeated twice with a surface resistance measuring instrument (MCP-HT450) over 3 points (see FIGS. 10 and 11) of the handle. Is shown in Table 1.

[표 1]TABLE 1

As such, when only carbon nanotubes alone were used (Comparative Example 2), the sheet resistance value was higher than 106, which was disadvantageous to implement as a heat generating handle, and in the case of CNT-metal nanoparticle mixture (Comparative Example 1), the degree of dispersion of Ag Was not uniform, it was confirmed that the shaking of the value according to the measurement was large. That is, in order to use as a heat generating material, it is necessary to use the CNT-metal nanoparticle composite state to have a uniform resistance value of the surface.

실험예 2Experimental Example 2

After the leather was formed on the handle made through Example 1 according to the present invention to form a finished product (see FIG. 11), a temperature rise test was performed by applying DC12Volt using an IT6720 power supply. In Comparative Example 1, the finished product was coated with leather, but DC12Volt was applied using an IT6720 power supply, but after 2 minutes, the temperature was increased and a short circuit did not work. In Comparative Example 2, no current flowed at DC 12 volts.

실험예 3Experimental Example 3

After the leather was formed on the handle made through Example 1 according to the present invention to form a finished product, it was cooled by standing for 6 hr in a low temperature chamber of -20 ℃. After that, the product was taken out at room temperature of 25 ° C., and DC12Volt was applied using IT6720 Power Supply to measure the temperature change of the handle surface with a thermocouple. As shown in the durability test results of FIG. 12, the temperature was raised to a temperature of 25 ° C. or more in one minute and began to feel heat from the handle surface, and reached about 35 ° C. after 5 minutes. It meets the heating handle specification (ES56110-05) which must reach 40 ℃ within 15 minutes, and the long-term stability test with the PID controller which keeps the handle constant temperature is removed. No deformation of the surface occurred.

As described above, in the present invention, the carbon nanotubes are uniformly organized in the carbon nanotubes, and the carbon nanotube-metal particle composite composition using a substitution reaction may be prepared to prevent the metal nanoparticles from falling off when preparing the dispersion solution. there was.

When the carbon nanotube-metal particle composite composition is made, the covalent bond structure of carbon-nanotubes, which is inherent in carbon nanotubes, and the resistivity of the current transfer are lost, resulting in a current density of about 1000 times that of copper, as well as carbon. The charge transfer path of the metal nanoparticles bonded to the nanotubes can simultaneously obtain a property of reducing contact resistance.

Through the present invention, the metal particles should be uniformly organized on each carbon nanotube particles and the metal nanoparticles become strong chemical bonds to the carbon nanotubes, thereby separating the carbon nanotubes and the metal nanoparticles from the coating solution in which the binder is mixed. The phenomenon does not occur. In addition, the carbon nanotube-metal particle composite uniformly coated on the 3D plastic handle shape is strongly bound to prevent negative resistance or metal nanoparticles from being separated and causing contact resistance over time. Can be. It is possible to remain constant and uniform within the heating demand range of the heating handle, rather than simply to lower the electrical conductivity.

On the other hand, the heating steering handle according to the present invention, the core to maintain the rigidity of the steering handle, the synthetic resin portion formed on the outer side of the core, the carbon nanotube-metal particle composite composition according to the present invention on the outer surface of the synthetic resin portion And a carbon nanotube heating coating layer having a coating formed thereon, and an electrode electrically connected to the carbon nanotube heating coating layer to induce heat generation.

The carbon nanotube exothermic coating layer of the present invention is coated with a carbon nanotube-metal particle composite composition in which carbon nanotube particles and metal particles are chemically bonded.

A cover may be wrapped on the outer side of the carbon nanotube heating coating layer.

The cover may be made of any one selected from leather, cloth, and PU (polyurethane).

A transfer layer may be formed on the outer side of the carbon nanotube heating coating layer by a hydrostatic transfer method.

An outer coating layer may be formed outside the transfer layer.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 2 is a plan view showing a heat steering handle to which the present invention is applied (a cover is removed from the spoke), and FIG. 3 is a cross-sectional view taken along the line A-A of FIG. As shown, the heat steering handle 100 to which the present invention is applied, the synthetic resin portion 120 is formed on the outer side of the core 110 made of steel or light alloy, the carbon nano-carbon on the outer surface of the synthetic resin portion 120 A carbon nanotube heating coating layer 130 having a tube-metal particle composite composition coated thereon is formed, and a cover 140 is wrapped on the outer side of the carbon nanotube heating coating layer 130.

The core 110 is formed of a rim 111 and the spokes 112, and may have various cross-sectional shapes such as a circular cross section, a c cross section or an H cross section.

The synthetic resin unit 120 is formed by forming a foam (foam: expanded plastic) by using PU (polyurethane), EPS (expanded polystyrene) or EPP (expanded polypropylene) as a raw material, or injection using synthetic resin such as ABS. It is formed by molding.

The carbon nanotube heating coating layer 130 is a layer coated by spraying the carbon nanotube-metal particle composite composition on the synthetic resin part 120, and metal particles such as silver (Ag) particles on the carbon nanotube (CNT). It is particularly preferable to spray-coat a chemically bonded carbon nanotube-metal particle composite composition.

The coating mass per unit area of the carbon nanotube heating coating layer 130 is preferably 3 to 15 g / m 2.

The electrode 131 is electrically connected to the carbon nanotube heating coating layer 130 to induce heat generation. Although the temperature controller 132 may be connected to the electrode 131 as necessary, a temperature controller 132 may be installed due to the intrinsic characteristics (charge control) of the carbon nanotubes (CNT) itself. You may not. A power connector 133 is connected to the temperature controller 132.

Carbon nanotubes (CNTs) are anisotropic materials with diameters and lengths of several to several hundred micrometers (μm). In carbon nanotubes, one carbon atom combines with three other carbon atoms to form a hexagonal honeycomb pattern. Draw this honeycomb pattern on flat paper, then roll the paper round to form a nanotube structure. In other words, one nanotube has the shape of a hollow tube or cylinder. This is called nanotubes because they are usually as small as one nanometer (one billionth of a meter). The honeycomb pattern on the paper is rounded to form a nanotube. Depending on the angle at which the paper is rolled, the carbon nanotube can be either an electrical conductor (Armchair) or a semiconductor (ZigZag structure).

The cover 140 is a finish made of leather or cloth or PU (polyurethane), the leather or cloth is wrapped around the carbon nanotube heating coating layer 130 is bonded by sewing, etc., the PU (polyurethane) is carbon nano It is coupled by coating or the like so as to surround the tube heating coating layer 130.

General known technology for a heating element using carbon nanotubes is disclosed in Korean Patent Registration No. 0475886 and the like, and thus detailed description of the formation of the carbon nanotube heating coating layer is omitted.

The heat steering handle according to the present invention configured as described above forms a synthetic resin part 120 on the outer side of the core 110, as shown in the process diagram of FIG. 5 and the flow chart of FIG. 6 (S1). The carbon nanotube exothermic coating layer 130 is formed by spraying a dispersion (Lq), which is a carbon nanotube-metal particle composite composition in which metal particles are chemically bonded to the surface of the carbon nanotube, on the outside of the unit 120. The electrode 131 is formed on the carbon nanotube heating coating layer 130 (S3), and if necessary, a temperature controller 132 is installed, and then the cover 140 is disposed outside the carbon nanotube heating coating layer 130. ) And wrap it together to complete it.

On the other hand, as shown in cross-section in Figure 4, as another embodiment of the present invention, the synthetic resin portion 120 is formed on the outer side of the core 110, the carbon nanotube heating coating layer on the outer surface of the synthetic resin portion 120 130 is formed. A pattern transfer layer 150 made of wood or metal may be formed on the outside of the carbon nanotube heating coating layer 130, and an outer coating layer 160 may be further formed on the outside of the transfer layer 150. The pattern transfer layer 150 such as wood or metal is formed by a known hydraulic transfer method, and the outer coating layer 160 may be coated by various materials and various methods known in the art.

In the heating wire heating element applied to the conventional heating steering wheel, since the contact surface of the heating element and the heating wire is localized, the heat transfer efficiency for the heating element is lowered and the temperature rising time to reach the maximum temperature is slow. However, the carbon nanotube heating element applied to the heating steering wheel of the present invention has excellent heat transfer efficiency for the heating element and a temperature rising time to reach the maximum temperature because the contact surface of the heating element and the heating layer is full.

In addition, general carbon heating elements (florene, amorphous carbon, and graphite) as shown in FIGS. 7A and 8A have a negative temperature resistance coefficient, which is a characteristic of carbon, and thus is repeated. It is difficult to secure reliability due to the decrease in resistance value due to use. In addition, since the heating element of the conventional metallic material has a positive temperature resistance coefficient, it is difficult to secure reliability by increasing the resistance value due to repeated use, but as shown in FIGS. 7 (b) and 8 (b). Carbon nanotubes (CNTs) are more linear and stable because they have fewer short circuits because they are linear rather than spherical in structure. In particular, the heating element made of the carbon nanotube-metal particle composite composition in which metal particles are chemically bonded to the carbon nanotube surface has a property of positive temperature coefficiency (PTC), so that the temperature resistance coefficient is almost zero, and the resistance value is repeated even in repeated use. It is easy to secure reliability without any change. This is not only corrected by mixing a carbon having a negative temperature resistance coefficient and a metal having a positive temperature resistance coefficient, but also a metal particle using a chemical bond on a carbon nanotube (CNT) surface. The above characteristics are realized by the coupling of the conductors.

And, as shown in the electrical network model in Figure 8 (a) is a general carbon is a carbon and carbon particles in contact with the electricity in the electrical conducts the electricity is due to this, there is a possibility that the carbon particles agglomerate at a specific site when the coating is applied to a specific site It generates a lot of heat. On the other hand, as shown in the electrical network model in FIG. 8 (b), the carbon nanotubes (CNT) realize an electrical network phenomenon through which electricity flows even when the particles are not attached and have a certain distance. This results in a performance that is equal to or higher than the content of ordinary carbon, thereby eliminating the possibility of agglomeration of carbon nanotube (CNT) particles at a specific site, and thus having a uniform heating distribution without collecting heat.

The heat steering handle of the present invention replaces the process of attaching a heating pad to the heat steering wheel by using a process of spraying a conductor such as carbon nanotube (CNT) and metal particles, thereby significantly reducing the manufacturing cost. Can be saved. In addition, it is possible to form a pattern transfer layer, such as wood or metal, it is possible to improve the grip feeling, free shape and resistance design is possible, it is possible to achieve a significant energy saving compared to the prior art. And because of the characteristics of the carbon nanotube (CNT) material (charge control), a separate temperature controller is not necessarily required.

Claims

a) preparing a carbon nanotube dispersion solution in which carbon nanotubes are dispersed;

b) acid treating the carbon nanotube dispersion solution of step a);

c) neutralizing the carbon nanotube dispersion solution of step b); And

d) a carbon nanotube-metal particle composite composition comprising mixing the carbon nanotube dispersion solution of step c) with a metal solution including metal particles, thereby bonding the metal particles to the surface of the carbon nanotubes.
The method according to claim 1, wherein the carbon nanotubes of step a), MWNT (multi wall nanotube); Thin wall nanotube (TWNT); And carbon nanotube-metal particle composite composition selected from one or more selected from single wall nanotubes (SWNTs).
The carbon nanotube-metal particle composite composition of claim 1, wherein the dispersion solution in step a) is prepared by dispersing the carbon nanotube in a solvent.
The carbon nanotube-metal particle composite composition of claim 1, wherein in step b), acid treatment is performed by adding at least one selected from nitric acid, sulfuric acid, hydrochloric acid, and perchloric acid.
The carbon nanotube-metal particle composite composition according to claim 1, wherein in step c), at least one selected from an aqueous sodium hydroxide solution, an aqueous potassium hydroxide solution and an aqueous ammonium hydroxide solution is added for neutralization.
The method according to claim 5, wherein in step c), the carbon nanotube dispersion solution of step b) and the carbon nanotubes are mixed by using at least one selected from sodium hydroxide aqueous solution, potassium hydroxide aqueous solution and ammonium hydroxide aqueous solution using ultrasonic waves. -Metal particle composite composition.
The method according to claim 1, wherein the metal solution containing the metal particles in step d), a solvent; 1 type selected from TOAB, 1,2-dichlorobenzene, N-methylpyrrolidone (NMP: N-methlypyrrolidone) and N, N-dimethylformamide (DMF: N, N-dimethylformamide) A solution in which formaldehyde (acetaldehyde) is mixed with formaldehyde (acetaldehyde); And one or more metal salts selected from among salts of Ag, Pt, Pd, Au, Cu, Ni, Al, Ag / Cu, Ag / Ni.
The method of claim 1, wherein the metal particles on the surface of the carbon nanotube in step d) is one or more selected from Ag, Pt, Pd, Au, Cu, Ni, Al, Ag / Cu, Ag / Ni and Cu / Ni Carbon nanotube-metal particle composite composition.
The method of claim 1, wherein the solution of step d) is MEK, MIBK, acetone (acetone), cyclohexanone (cyclohexanone), ketone-based solution, butoxyethyl acetate (butoxyethyl acetate), butyl carbitol acetate (BCA: butyl cabitol preparing a dispersion solution by dispersing in at least one selected from acetate) and an acetate-based solution; And

Carbon nanotube-metal particle composite composition further comprising the step of mixing the dispersion solution and the binder.
Core to maintain the steering wheel rigidity,

Synthetic resin portion formed on the outer side of the core,

A carbon nanotube exothermic coating layer having a carbon nanotube-metal particle composite composition according to any one of claims 1 to 9 coated thereon;

Heat steering handle, characterized in that it comprises an electrode which is electrically connected to the carbon nanotube heating coating layer to induce heat generation.
The method according to claim 10,

Heat steering handle, characterized in that the cover is wrapped on the outside of the carbon nanotube heating coating layer.
The method according to claim 11,

The cover is a heat steering handle, characterized in that made of any one selected from leather, cloth and PU (polyurethane).
The method according to claim 10,

A heat steering wheel, characterized in that the transfer layer is formed on the outside of the carbon nanotube heating coating layer by a hydrostatic transfer method.
The method according to claim 13,

Heat steering wheel, characterized in that the outer coating layer is formed outside the transfer layer.