KR100885749B1 - Road paving material with heat emissivity function - Google Patents

Abstract

A road paving material having heat radiation function is provided to suppress excessive temperature rise of the surface layer by radiating absorbed heat energy in the form of electro magnetic wave. A road paving material having heat radiation function comprises a base layer(110) formed with ascon, water permeability concrete or concrete, a primer layer(120) coated onto the base layer, and a heat radiation coating layer(130) formed on the top of the primer layer. The heat radiation coating layer is formed by coating paint onto the upper side of the primer layer, where the paint includes the resin 100 parts by weight and heat radiation agent 3-20.

Description

ROAD PAVING MATERIAL WITH HEAT EMISSIVITY FUNCTION}

The present invention relates to a road pavement, and more particularly, the surface layer exposed to the outside is a form of rapidly radiating thermal energy in the form of electromagnetic waves, so that excessive temperature rise of the surface layer is essentially suppressed regardless of its color or contamination. It relates to a road paving material having a thermal radiation function.

The solar energy in summer in Korea reaches an average of 5,900㎉ / ㎡ per day, and this solar energy can raise the surface temperature of the midday iron plate roof to around 80 ℃. This increase in temperature is a phenomenon that occurs due to the movement of heat, and the mechanism of moving the heat is classified into the following three kinds. That is, conduction through which heat moves directly from a high temperature to a low temperature, a convection in which heat is transferred through a flow or movement of a gas or liquid, which is a fluid medium, and not through a separate medium. There is radiation in which heat energy radiated directly from a heat source hits the surface of an object, causing vibration of molecules to generate heat energy.

Sunlight is a kind of electromagnetic wave, which varies depending on the season and region. However, it is generally divided into 3-7% of ultraviolet rays, 47-50% of visible rays, and 43-50% of infrared rays. At this time, infrared rays, which occupy half of the sunlight, are absorbed on the surface of road pavement such as ascon, tuscon, and concrete, causing the vibration of molecules to generate heat energy. Accordingly, the road pavement increases its surface temperature. This increase in the surface temperature of the road pavement intensifies the heat island phenomenon of the city, which leads to an increase in the consumption of energy required for cooling in the hot summer months.

The recent energy problem is a serious problem all over the world due to the supply-demand control and continuous price increase of oil-producing countries. In particular, if the country relies solely on energy sources, such as Korea, it is more serious. Therefore, in countries that rely solely on imports of energy sources, such as Korea, the roads efficiently radiate heat generated by absorbing infrared rays, thereby minimizing changes in the surface temperature of the roads, thereby alleviating urban heat island phenomena. It is necessary to reduce the energy consumption used for such.

Here, although the form of applying a heat shielding coating that is being used to the surface of the coated packaging material can be expected, it is expected to expose various functional limitations as described below.

That is, conventional heat shield paints generally have a thickness of 100 to 200 μm, effectively reflecting infrared rays that generate thermal energy in sunlight, thereby suppressing conversion of infrared rays into thermal energy, and absorbing infrared rays without being reflected. When generated, this thermal energy has a function of blocking the conduction inside.

In other words, the most closely related to the effect of suppressing the temperature rise of the thermal insulation paint is the solar radiation reflectivity, which indicates the degree of effectively reflecting infrared rays and suppressing the conversion into thermal energy, and the infrared rays converted when absorbed without being reflected. Conductive heat shield, which indicates the degree to which thermal energy is prevented from being conducted, commonly used heat shield paints are white or near white pigments mixed to increase solar reflectance, or ceramic balloons to increase the thermal shield. It is a form in which hollow pigments, such as these, were mixed.

In recent years, technologies for increasing the total heat shield function by increasing the solar radiation reflectance and the conductive heat shielding rate have been proposed.

Japanese Patent Application Laid-Open No. JP 2005-68394 A 2005. 03. 17. 1 provides a heat shield coating using polybutadiene rubber as a retainer for stably laminating and arranging special pigments having high solar reflectance and hollow ceramics having high conduction heat shielding rate. Disclosed is a method for preparing a thermal barrier paint that blocks thermal energy absorption.

Korea Patent Publication No. 10-0741147, 2007. 07. 19. is a road insulation coating material invented to protect concrete pavement and asphalt road surface from the risk factors affected by temperature or external environment, and prevent dust pollution, The road heat shield paint is disclosed to minimize the damage and reduce the maintenance cost of the road.The road heat shield paint mixes ceramic powder with the road paint whose main raw material is water-soluble epoxy resin. It was characterized by the addition of water, there was a heat shielding effect of 10 ℃ or more.

However, conventional heat shielding paints, such as pigments added to paints to have an infrared reflecting function, basically use white. Therefore, if the surface coated with paint becomes contaminated or damaged over time, the heat shielding paint is applied. Since the white is gradually changed, there is a problem that the infrared reflectance (solar reflectance) is significantly reduced. In addition, the hollow ceramic material used for the conductive heat shielding has a problem of significantly lowering the heat shielding effect as it acts as a thermal mass rather than as time passes.

In conclusion, the heat shielding function of the conventional heat shielding coatings is significantly reduced as time passes after the coating is significantly reduced, so that the heat shielding function is greatly reduced. When the heat shielding function is provided to the road pavement using paint, the problems of the conventional heat shielding paint are exposed as it is.

Moreover, road pavement is usually formed in black or other dark colors, and it is not suitable to apply conventional heat shield paint to such pavement.

The present invention is to overcome the above-mentioned conventional problems, an object of the present invention is to provide a road pavement material having a heat radiation function that radiates radiant heat or other absorbed thermal energy of sunlight quickly to the outside in the form of electromagnetic waves.

In addition, another object of the present invention is to provide a thermal radiation function that allows the temperature of the surface to be maintained in a constant range by essentially reducing heat regardless of damage or contamination over time after installation or color of the surface exposed to the outside. It is to provide a road pavement having.

In order to achieve the above object, the road pavement material having a heat radiation function according to the present invention is a road pavement material is formed by applying a primer layer on the upper surface of the base layer formed of ascone, pitcher cone or concrete, the top of the primer layer A thermal radiation coating layer is formed on the thermal radiation coating layer, characterized in that the paint formed by coating the upper surface of the primer layer is formed by including 100 parts by weight of the resin and 3 to 20 parts by weight of the thermal radiation material.

In addition, the resin may be any one of alkyd, amino, epoxy, phenol, urethane, silicone, nitrocellulose, rubber chloride, vinyl, MMA (methyl metha acrylate), acrylic resin.

In addition, the thermal radiation material is elvan [SiO ₂ (48%) Al ₂ O ₃ (32%) Na ₂ O (9%)], titanium dioxide (TiO₂), oxides of calcium [CaO], calcium hydroxide [Ca (OH) ₂], Kaolin [SiO ₂ (47%) Al ₂ O ₃ (40%)], Serenite [SiO ₂ (67%) Al ₂ O ₃ (20%) Na ₂ O (9%) ], Illite [SiO ₂ (48%) Al ₂ O ₃ (32%) Na ₂ O (9%)], zeolite [SiO ₂ (78%) Al ₂ O ₃ (8%)], rare earths [SiO ₂ Al ₂ O ₃ ], may be at least one of silica (oxide, carbide, nitride).

In addition, the thermal radiation material has a particle size of 0.5 ~ 20㎛, the shape may be any one of spherical, fibrous, flaky, planar shape, crushed or irregular shape.

The road pavement material having the heat radiation function of the present invention is to radiate the absorbed heat energy to the outside quickly in the form of electromagnetic waves, so that without being affected by the damage or contamination over time and the surface color exposed to radiation heat Fundamentally reduces heat. As a result, the road surface temperature of the various roads formed by the road pavement material can be maintained in a certain range, thereby greatly remedy the heat island phenomenon of the city, which appears to effectively reduce the energy consumption required for cooling.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention.

1 is a cross-sectional view schematically showing the configuration of a road pavement material having a thermal radiation function according to an embodiment of the present invention. Figure 2 is a detailed view showing an apparatus for testing the radiation loss amount of the road pavement material having a thermal radiation function according to an embodiment of the present invention.

Road pavement material 100 having a thermal radiation function according to an embodiment of the present invention is formed by including the base layer 110 and the primer layer 120 and the thermal radiation coating layer 130 as shown in FIG. The primer layer 120 is formed on the upper surface of the base layer 110, and the thermal radiation coating layer 130 is formed on the upper surface of the primer layer 120, the thermal radiation coating layer 130 is 100 parts by weight of resin And a coating material including 3 to 20 parts by weight of a thermal radiation material are applied to the upper surface of the primer layer 120. Here, either the ascon layer, the tuscon layer or the concrete layer is used as the base layer 110. In this embodiment, the ascon layer is used as the base layer 110 of the road pavement material 100 having a thermal radiation function.

The thermal radiation material included in the thermal radiation coating layer 130 is to efficiently heat-radiate, such as the thermal radiation material elvan (SiO ₂ (48%) Al ₂ O ₃ (32%) Na ₂ O (9%)), Titanium dioxide (TiO₂), oxide of calcium [CaO], hydroxide of calcium [Ca (OH) ₂], kaolin [SiO ₂ (47%) Al ₂ O ₃ (40%)], fly ash, steel slag , Serenite [SiO ₂ (67%) Al ₂ O ₃ (20%) Na ₂ O (9%)], illite [SiO ₂ (48%) Al ₂ O ₃ (32%) Na ₂ O (9% )], Zeolite [SiO ₂ (78%) Al ₂ O ₃ (8%)], rare earth [SiO ₂ Al ₂ O ₃ ], at least one of silica-based (oxides, carbides, nitrides) may be used.

In addition, the particle size of the thermal radiation material is 0.5 ~ 20㎛, the shape of the thermal radiation material may be at least any one of spherical, fibrous, flaky, planar shape, crushed or irregular shape. Here, the thermal radiation material of the present invention is not limited to a specific shape.

When the thermal radiation material is included in less than 3 parts by weight of 100 parts by weight of the resin, there may be a problem that the heat radiation function is weak. On the contrary, when the thermal radiation material is used in an amount of more than 20 parts by weight in 100 parts by weight of resin, a problem of strength deterioration occurs due to unevenness of the coating layer. As a result, the coating layer may be weakened and cracks may occur. In addition, the thermal radiation material is relatively expensive, there may be a problem of economics.

The resin used in the thermal radiation coating layer 130 according to an embodiment of the present invention is not particularly limited and may be applied to any resins that have been applied to all the known paints. It is possible to. For example, all kinds of resins including alkyd, amino, epoxy, phenol, urethane, silicone, nitrocellulose, rubber chloride, vinyl, methyl metha acrylate (MMA), acrylic, and the like can be used.

The thermal radiation coating layer 130 according to an embodiment of the present invention may implement various colors by adding a pigment. The general properties of the pigment are colored organic and inorganic compounds that are insoluble in the mother, such as water, oil, and solvent, and are fine powders. The pigment itself does not have a property of coloring an object, but it is colored by being dispersed in combination with cement and fixed. The pigments include inorganic pigments and organic pigments, but it is preferable to use inorganic pigments having excellent weather resistance against gas phase changes and low color changes. Inorganic pigments include titanium dioxide, iron oxide red, iron oxide yellow, chromium oxide, carbon black, zinc oxide, and the like.

In one embodiment of the present invention, the diluent is not particularly limited and can be used as long as it has been applied to all conventionally known resins so that it can be appropriately selected and used according to the purpose and purpose. For example, when the resin used for the paint is an aqueous resin, water is used. If the resin used for the paint is an MMA (methyl metha acrylate) resin, an MMA monomer is used. The resin used for the paint is urethane. In the case of resin, a diluent can be selected and used according to the characteristic of resin, such as using toluene.

In one embodiment of the present invention, the accelerator and the curing accelerator may be added only when necessary depending on the type of resin used in the paint.

Thermal radiation coating layer 130 according to an embodiment of the present invention may be composed of a variety of resins of various colors and when applying a coating containing a thermal radiation agent using a suitable dedicated coating method such as spray, roller, impregnation and brush Apply to the surface of the main body evenly so that the dry film thickness is more than 200㎛ (required amount about 2 ~ 2.5kg / m ² ), and after the application to go through the natural drying and curing process for 30 to 90 minutes.

Hereinafter, the present invention will be described in detail through examples and heat shield effect tests and radiation loss tests.

Experimental Example

Thermal insulation was produced by the specimens (20 × 20 ㎝) according to the present invention, respectively exposed for 2 hours under the summer sunlight (32 ℃, 65%) and then averaged the temperature at each of three sites using a multi-point temperature measuring instrument The temperature difference was obtained by measuring the temperature.

< Example 1>

Example 1 100 parts by weight of a one-component acrylic resin emulsion used in general water-based paints to prepare ascon specimen (20 × 20 cm), SiO ₂ as a thermal radiation material 48%, Al ₂ O ₃ 32%, 9% by weight of Na ₂ O, elvan, 10 parts by weight of inorganic pigment, 3 parts by weight of inorganic pigment, and 6 parts by weight of water were added, and dispersed and stirred at 500 rpm for about 1 hour to prepare a paint containing a thermal radiation material. , 500 μm of the coating material containing the thermal radiation material thus prepared was applied to the ascon specimen. Here, the paint containing the thermal radiation material may be to be applied to the asphalt concrete by the spray method.

< Example 2>

Example 2 prepared ascon specimen (20 × 20 ㎝) 100 parts by weight of MMA (methyl meta acrylate) resin, SiO ₂ as a thermal radiation material 48%, Al ₂ O ₃ 32 parts by weight, 10 parts by weight of Elvan, 9% Na ₂ O, 3 parts by weight of inorganic pigment, 0.5 parts by weight of accelerator, 1 part by weight of curing accelerator, and 6 parts by weight of methyl meta acrylate (MMA) monomer as diluent After the addition, the mixture was mixed and stirred for about 1 hour at 500 rpm to prepare a paint containing a thermal radiation material, and the paint containing the thermal radiation material thus prepared was applied to the ascon specimen 500 μm. Here, the paint containing the thermal radiation material may be to be applied to the asphalt concrete by the spray method.

< Example 3>

Example 3 prepared 100 parts by weight of a one-component acrylic resin emulsion used for general water-based paints to prepare ascon specimen (20 × 20 cm), 10 parts by weight of SiC (silicon carbide) as a thermal radiation material, 3 parts by weight of inorganic pigments and diluent 6 parts by weight of water was added and dispersed at 500 rpm for 1 hour to prepare a paint containing a thermal radiation material, and the paint containing the thermal radiation material thus prepared was applied to the ascon specimen 500 μm. In this case, the thermal radiation-containing paint may be applied to the ascon specimen in a spray method.

< Comparative Example 1>

In Comparative Example 1, ascon specimens (20 × 20 cm) were prepared, and 100 parts by weight of a one-component acrylic resin emulsion used for general water-based paints, 3 parts by weight of inorganic pigments and 6 parts by weight of water with a diluent, were added at about 500 rpm for about 1 hour. Dispersion and stirring to prepare a paint, and the paint thus prepared was applied to the asphalt concrete specimen 500㎛. Ascon specimen thus prepared is referred to as Comparative Experiment Specimen 1.

< Comparative Example 2>

In Comparative Example 2, ascon specimen (20 × 20 cm) was prepared and 100 parts by weight of a one-component acrylic resin emulsion used for general water-based paints, 10 parts by weight of a hollow ceramic powder of thermal insulation material used in conventional heat shielding paints, and inorganic pigments 3 6 parts by weight of water and a diluent were added to disperse and stir at 500 rpm for about 1 hour to prepare a paint, and the paint thus prepared was applied to the ascon specimen 500 μm. Ascon specimen thus prepared is referred to as Comparative Experiment Specimen 2.

Experimental results using the ascon specimens prepared in Examples 1 to 3 and Comparative Examples 1 and 2 are shown in Table 1 below.

Example 1 Example 2 Example 3 Comparative Example 1 Comparative Example 2 Shore A 55 57 58 54 55 Adhesive force (MPa) 2.2 2.5 2.0 2.5 2.3 Wear loss (%) 200 180 230 200 230 Spray workability Good Good Good Good Good Thermal insulation (temperature difference, ℃) 60 67 65 80 68 Thermal insulation after surface contamination (temperature difference, ℃) 60 68 65 80 77 Radiation loss 14 12 10 2 5

As can be seen from Table 1, in the thermal insulation experiment, the comparative test specimen 1 of Comparative Example 1 the temperature of the surface was raised to 80 ℃. On the other hand, the ascon specimen of Example 1 showed a temperature difference of 20 ° C. compared with the surface temperature of the comparative test specimen 1 as the temperature of the surface of the surface was increased to 60 ° C., and the ascon specimen of Example 2 had a surface temperature of The temperature was increased to 67 ° C. and the temperature difference of 13 ° C. was compared with the surface temperature of Comparative Test Sample 1, and the Ascon specimen of Example 3 rose to 65 ° C. in comparison with the surface temperature of Comparative Test Sample 1. The temperature difference of 15 degreeC was shown.

In other words, the ascon specimens of Examples 1 to 3 coated with a thermal radiation coating layer including a thermal radiation material showed a heat shielding effect of about 13 to 20 ° C. compared with Comparative Experiment 1 of Comparative Example 1, which was not the case. The surface of the road paving material having a heat radiation function according to an embodiment of the present invention by the heat radiation coating layer was confirmed that the heat shielding effect is superior to the surface of the general road pavement.

In addition, Comparative Experimental Specimen 2 of Comparative Example 2 exhibited a temperature difference of 12 ° C. compared with the surface temperature of Comparative Experiment specimen 1 as the temperature of the surface thereof was 68 ° C. in the heat shielding experiment, which was performed in Examples 1 to 3. There was no significant difference compared to ascon specimens. However, as can be seen from the results of the thermal conductivity test after contaminating the surface of the ascon specimens of Examples 1 to 3 and the surface of the comparative test specimen of Comparative Example 2, the ascon specimens of Examples 1 to 3 Compared with Comparative Test Specimen 1 of Comparative Example 1 and the temperature difference between 12 and 20 ° C. even after the surface contamination, Comparative Test Specimen 2 of Comparative Example 2 was almost the same as Comparative Test Specimen 1 of Comparative Example 1 after the surface contamination. It can be seen that the thermal insulation function is significantly reduced by indicating the temperature.

In other words, the coating material of Comparative Example 2, in which the ceramic material, which is a conventional heat shielding material, is added, has a role as a heat shielding paint because the ceramic powder, which is a heat shielding material, acts as a heat storage material when the market surface is contaminated or damaged over time after coating. On the contrary, after the ascon specimens of Examples 1 to 3 according to the embodiment of the present invention are coated with a thermal radiation coating layer on the surface thereof, the heat shielding effect is continuously maintained regardless of whether the thermal radiation coating layer is contaminated or damaged. You can see that.

This is due to the method of radiating the heat energy absorbed by the paint forming the thermal radiation coating layer including the thermal radiation material according to an embodiment of the present invention to the outside in the form of electromagnetic waves quickly.

That is, the conventional heat shield paint is a method of adding a special pigment or a white pigment having a high solar reflectance to increase the solar reflectance to shield the heat shielding, or a method of heat shielding by increasing the conductivity heat shielding rate using ceramic powder, The paint and the thermal radiation coating layer according to the embodiment is a method of thermally radiating heat energy of high-temperature and high-temperature absorbed as described above to the outside in the form of electromagnetic waves to shield the heat.

Accordingly, the surface of the conventional thermal barrier coating applied to the thermal barrier is significantly reduced in the thermal shielding effect when the coated surface is contaminated and damaged or is not white due to the color pigment, but one embodiment of the present invention Road pavement 100 having a heat radiation function according to the thermal radiation coating layer 130 of the surface, regardless of whether the contamination or damage or color of the surface can be maintained a heat shielding effect.

And, Figure 2 is a detailed view showing a device for testing the radiation loss of the road pavement material having a heat radiation function according to an embodiment of the present invention, each commercially used in the heat shield effect test on the heater and the same designation The amount of power consumed to maintain the temperature (60 ℃) was measured to compare the radiation loss through it. Of course, there may be losses due to conduction or convection in this process, but the insulation is doubled and the surrounding environment is fully considered to minimize the loss of convection. Only in order to induce the radiation loss, the upper side has to be left open, and the convection loss through the process is assumed to be the same condition.

As a result, the power loss consumed to maintain the temperature of 60 ℃ is shown in Table 1, road pavement without thermal radiation (Comparative Test Specimen 1 of Comparative Example 1) and road pavement with the addition of conventional thermal insulation ceramic powder (Comparative Test Specimen 2 of Comparative Example 2) was about 2 ~ 5W (Watt), whereas the specimen (Ascon specimens of Examples 1 to 3) to which the thermal radiation was added is about 10 ~ 14W (Watt), Road pavement material formed with a thermal radiation coating layer 130 according to an embodiment was found to significantly increase the amount of power consumed to maintain a constant temperature.

Through the above results, the road pavement material 100 having the thermal radiation coating layer 130 according to the embodiment of the present invention, unlike the road pavement material to which the existing heat shielding coating is applied, simply reflects infrared rays or blocks heat conduction. Unlike the thermal shielding method, the absorbed thermal energy is rapidly radiated through the thermal radiation material of the thermal radiation coating layer 130, and thus, the thermal shielding effect is realized, thereby demonstrating the fundamental effect of reducing heat.

What has been described above is only one embodiment for implementing a road pavement material having a thermal radiation function according to the present invention, the present invention is not limited to the above embodiment, as claimed in the following claims Without departing from the gist of the invention, anyone of ordinary skill in the art to which the present invention will have the technical spirit of the present invention to the extent that various modifications can be made.

1 is a cross-sectional view schematically showing the configuration of a road pavement material having a thermal radiation function according to an embodiment of the present invention

Figure 2 is a detailed view showing an apparatus for testing the radiation loss amount of the road pavement material having a thermal radiation function according to an embodiment of the present invention

* Description of the symbols for the main parts of the drawings *

100: road pavement material having a thermal radiation function 110: base layer

120: primer layer 130: thermal radiation coating layer

Claims (4)

In the road pavement material is formed by applying a primer layer on the upper surface of the base layer formed of ascone, pitcher cone or concrete, A thermal radiation coating layer is formed on the primer layer, and the thermal radiation coating layer is formed by applying a coating material including 100 parts by weight of a resin and 3 to 20 parts by weight of a thermal radiation material to the upper surface of the primer layer. The road pavement material having a thermal radiation function, characterized in that the particle size is 0.5 ~ 20㎛ and the shape is any one of spherical, fibrous, flaky, planar, crushed or irregular shape. The method of claim 1, The resin is an alkyd, amino, epoxy, phenol, urethane, silicone, nitrocellulose, rubber chloride, vinyl, MMA (methyl metha acrylate), road paving material having a heat radiation function, characterized in that any of acrylic resins. The method of claim 1, The thermal radiation material is elvan [SiO ₂ (48%) Al ₂ O ₃ (32%) Na ₂ O (9%)], titanium dioxide (TiO₂), oxide of calcium [CaO], calcium hydroxide [Ca (OH) ₂], kaolin [SiO ₂ (47%) Al ₂ O ₃ (40%)], serenite [SiO ₂ (67%) Al ₂ O ₃ (20%) Na ₂ O (9%)], Illite [SiO ₂ (48%) Al ₂ O ₃ (32%) Na ₂ O (9%)], zeolite [SiO ₂ (78%) Al ₂ O ₃ (8%)], rare earths [SiO ₂ Al ₂ O ₃ ], silica-based (oxide, carbide, nitride) road paving material having a heat radiation function, characterized in that at least one. delete

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