KR101005045B1 - Pollutant resistant heat-resistant paint and coating method using the same - Google Patents

Abstract

The present invention relates to a stain resistant heat-resistant paint and a composite coating method using the same. The present invention is a composite coating system of the upper layer to enhance the adhesion to the concrete mortar of the building and the heat insulation performance and the top layer with high thermal insulation performance and pollution resistance, so that the energy inside the winter is not lost by perfect insulation. And, in summer, it is possible to save the heating and cooling energy by lowering the internal temperature rise of the building by the absorption of solar heat with high heat shielding performance.

Description

Pollution-resistant heat-resistant paint and coating method using same {A STAINRESISTANT THERMAL BARRIER PAINT AND A PAINTING PROCESS USING THE SAME}

The present invention relates to a stain resistant heat-resistant paint and a composite coating method using the same.

As the urbanization progresses, the surface temperature of concrete or steel in the middle of summer due to solar heat is increased due to the decrease of the green area and water surface, which increases the cooling load inside the building and heats up the heat island. Effect).

In addition, Korea has over 90% of its energy dependence overseas, and the share of total building energy use has reached about 33% in 1990.In 2009, as a part of the low-carbon green growth policy, energy reduction of buildings was reduced. The government has tightened regulations on the government and announced a policy to improve national energy efficiency by 11.3% by 2010.

Accordingly, domestic construction companies are strengthening their brand image with the trend of zero energy house, and demand for energy-efficient building materials is soaring to cope with this.

Accordingly, many thermal insulation materials have been developed and used in actual buildings. However, the existing heat insulating material is inevitably increased in order to increase the thermal barrier effect, which leads to an increase in the wall thickness according to the increase in the thickness of the heat insulating material, there is a disadvantage such as reducing the use area of the building, increase in construction costs. In addition, the existing heat insulating material is difficult to adhere to the wall, there is a limit to improve the thermal insulation performance of the joint, there is a lot of cases that the construction of the heat insulating material is difficult or impossible due to the structural problems of the building itself.

Therefore, we are developing products to block solar light by using hollow ceramic pigments and porous ceramic materials, and to suppress thermal conductivity by using ceramic porosity, and use some PCM (Phase Change Material) materials to prevent latent heat. Insulating paints that can be stored in the form to maintain the cooling or heating effect for a certain time even after cooling or heating is stopped are being developed.

For example, Korean Patent Registration 10-0741147 discloses a heat shielding paint for roads in which ceramic powder is added to a water-soluble epoxy resin. In Korean Patent Registration 10-0842178, a binder including an inorganic raw material cement and a bisphenol-based epoxy resin are 1 Disclosed is a heat shield coating material in which a lightweight insulating filler is mixed with a raw material having a weight ratio of 5: 5.

However, these technologies are technologies that improve energy efficiency by preventing the exposure of heating and cooling energy inside the building to the outside in a way that prevents heat conduction between objects and reduces heat loss. .

Therefore, the problem to be solved in the present invention is to provide a stain-resistant heat-resistant coating excellent in heat shielding properties.

Another object to be solved by the present invention is to provide a composite coating method using a pollution-resistant heat-resistant coating having excellent heat shielding properties of the present invention as a top coat layer, a heat insulating paint having excellent heat insulating performance as a middle layer.

In order to solve the above problems,

The present invention is 10-20% by weight of water, 20-40% by weight of binder, 10-30% by weight of heat shield pigment, 10-20% by weight of white pigment, and 10-20% by weight of extender pigment Provide paint.

The binder is preferably selected from the group consisting of acrylic resins, acrylic-silicone copolymers, silicone resins, water-soluble polyurethane resins, acrylic-urethane copolymers and acrylic-silicone-urethane copolymers.

The heat shield pigment is preferably selected from the group consisting of titanium oxide, alumina, magnesium oxide, aluminum, calcium oxide, zinc oxide, mica and mica titanium.

In addition, the present invention is a coating composition comprising 10 to 20% by weight of water, 20 to 40% by weight of binder, 10 to 30% by weight of heat shield pigment, 10 to 20% by weight of white pigment and 10 to 20% by weight of extender pigment. The coating composition comprising 10 to 20% by weight of water, 10 to 30% by weight of binder, 10 to 30% by weight of insulating pigment, 1 to 20% by weight of white pigment, and 10 to 20% by weight of extender pigment is used as a middle layer. Provided is a coating method comprising a coating composition comprising 5 to 70% by weight of water, 20 to 90% by weight of a binder, and 1 to 10% by weight of a silane coupling agent.

The binder is preferably selected from the group consisting of acrylic resins, acrylic-silicone copolymers, silicone resins, water-soluble polyurethane resins, acrylic-urethane copolymers and acrylic-silicone-urethane copolymers.

The heat shield pigment is preferably selected from the group consisting of titanium oxide, alumina, magnesium oxide, aluminum, calcium oxide, zinc oxide, mica and mica titanium.

The insulating pigment is preferably selected from the group consisting of aluminosilicate, hollow glass beads, inorganic silicate, borosilicate and chromite.

The present invention is a composite coating system of the upper layer to enhance the adhesion to the concrete mortar of the building and the heat insulation performance and the top layer with high thermal insulation performance and pollution resistance, so that the energy inside the winter is not lost by perfect insulation. And, in summer, it is possible to save the heating and cooling energy by lowering the internal temperature rise of the building by the absorption of solar heat with high heat shielding performance.

1 is a schematic diagram of a composite coating system using a stain-resistant heat-resistant paint of the present invention,
FIG. 2 is a schematic diagram of mica titanium having a plate-like structure having low refractive index and titanium dioxide having a high refractive index coated thereto to scatter light due to a difference in refractive index when reflection is received.
3A and 3B are electron microscope (SEM) photographs of hollow glass beads applied as an insulating pigment,
4 is a schematic diagram of test equipment for evaluating fouling resistance.

EMBODIMENT OF THE INVENTION Hereinafter, this invention is demonstrated in detail.

The present invention is 10-20% by weight of water, 20-40% by weight of binder, 10-30% by weight of heat shield pigment, 10-20% by weight of white pigment, and 10-20% by weight of extender pigment Provide paint.

In addition, the present invention, as described above, in order to maximize the thermal insulation performance to provide a composite coating method comprising a top coat layer for strengthening the adhesive strength, a middle layer with improved thermal insulation performance and a heat insulation performance, the top coat layer with increased stain resistance. do.

Accordingly, the present invention is a coating composition comprising 10 to 20% by weight of water, 20 to 40% by weight of binder, 10 to 30% by weight of heat shield pigment, 10 to 20% by weight of white pigment and 10 to 20% by weight of extender pigment. The coating composition comprising 10 to 20% by weight of water, 10 to 30% by weight of binder, 10 to 30% by weight of insulating pigment, 1 to 20% by weight of white pigment, and 10 to 20% by weight of extender pigment is used as a middle layer. Provided is a coating method comprising a coating composition comprising 5 to 70% by weight of water, 20 to 90% by weight of a binder, and 1 to 10% by weight of a silane coupling agent.

The binder is preferably selected from the group consisting of acrylic resins, acrylic-silicone copolymers, silicone resins, water-soluble polyurethane resins, acrylic-urethane copolymers and acrylic-silicone-urethane copolymers.

In paints, resins have different physical properties depending on the properties and Tg of monomers polymerized as a raw material that influences physical properties such as paint durability and weather resistance. Therefore, the present invention should be excellent in weather resistance and durability as the exterior heat shielding paint, and exhibits heat shielding performance by high solar reflectance to improve pollution resistance so that the solar coating does not degrade due to contaminants.

In order to achieve the above object, the present invention polymerizes a mono-terminal type reactive silicone capable of exerting high fouling resistance by durability, weather resistance and surface tension in an acrylic monomer for film formation and economy. Controlling the Tg of the polymerized resin is controlled by mixing ratio of the hard acrylic monomer and the soft acrylic monomer. The heat shielding paint is adjusted to Tg 5 ° C. or higher, preferably 5 ° C. to 10 ° C. as the exterior paint. If the Tg value is too high, film formation does not work well and a plasticizer should be used. When using a plasticizer, there is a problem of degrading environmental properties. On the other hand, if the Tg value is too low, below -20 ℃, secondary pollution may be caused by Tacky in summer.

In the present invention, a high monomer of MMA (Methylmethacrylate) having good weather resistance and a high reactivity of the soft monomer BA (n-butylacrylate) and MAA (methacrylic acid) functional monomer are added to the reactor of the reactive silicone monomer at a weight ratio of 1: 1: 0.5. Hydroxyl-, Methacryloxy-, Methacryloy- and so on can be used. Depending on the silane reactor, Amino-, Epoxy-, Vinyl- and Acryl- can be used.

In addition, the present invention does not use nonylphenol-based surfactants commonly used by nonylphenol regulation for environmental friendliness, nonnonylphenol-based nonionic anionic emulsifiers, and oxidized to minimize the amount of volatile organic compounds While adding a small amount of catalyst to remove residual monomer, emulsion polymerization is carried out at 60 to 80 rpm at 60 to 80 rpm for 5 to 8 hours to react with an average particle size of 0.1 µm to 5 µm, preferably 0.1 µm to 0.2 µm.

The insulating pigment is preferably selected from the group consisting of aluminosilicate, hollow glass beads, inorganic silicate, borosilicate and chromite.

In a preferred embodiment of the present invention, hollow glass beads having a low thermal conductivity of 0.047 to 0.2 W / m · K in various inorganic fillers are used in a moderate system having excellent thermal insulation performance. Preferably 10 to 30% by weight of hollow glass beads having a particle size of 10 ~ 50㎛. In particular, the hollow glass beads have a low oil absorption compared to other pigments to maintain the storage stability of the paint, and improve the painting workability. It is also used as an insulator for very good heat since it is in the form of a hollow cell.

The heat shield pigment is preferably selected from the group consisting of titanium oxide, alumina, magnesium oxide, aluminum, calcium oxide, zinc oxide, mica and mica titanium.

The present invention uses an inorganic pigment having a refractive index of 1.5 or more in order to increase the solar reflectance and to exhibit heat shielding performance. In particular, 10-20% by weight of the rutile titanium dioxide having the highest refractive index among the inorganic pigments is used as a white pigment, which improves the concealment ratio of the paint and suppresses the reception of heat in the coating film by reflecting light.

In addition, the present invention uses a mica having excellent insulating properties in a plate-like structure. These mica is classified into mica ores, mica salts, mica fragments, and lithium mica. Mica leaves are used in vacuum tubes, commutator materials for electric machines, insulators, insulators, windows of furnaces, etc. Mica flakes are used as lubricant and raw material. The main minerals are dolomite, gold mica, biotite, fluorescent gold mica, red mica, soot mica, biotite, and commercially used mica and biotite. In this case, in order to increase the thermal insulation performance, when the mica pieces and the light are received as shown in FIG. 2, the refractive index difference of each raw material causes the high refractive index to the low refractive index plate structure mica so that more light is reflected by reflection and scattering. 10-30% by weight of a new thermal pigment of mica titanium coated with titanium oxide.

The present invention uses calcium carbonate, talc, kaolin or the like as a extender pigment or filler.

Although not essential to the present invention, there are additives that are commonly used in paints to improve coating properties. The freeze stabilizer, dispersant, antifoaming agent, pH adjuster, thickener, preservative, etc. may be added, these additives are preferably included 0.5 to 5% by weight relative to the total weight.

As the dispersant, one or more substances selected from the group consisting of naphthalene sulfonate formalin condensate, melamine sulfonate formalin condensate, polycarboxylic acid compound, polycarboxylic acid ether, aromatic amino sulfonic acid polymer and lignin sulfonic acid may be used. As the antifoaming agent, a mineral oil-based, silicone-based, and other antifoaming agents may be used.

In addition, propylene glycol, ethylene glycol may be used as the freeze-stabilizer, and the thickener may be a hydroxyethyl cellulose, a urethane-based thickener may be partially used to complement smooth workability. The pH adjusting agent may use 2-amino-2-methyl-1-propenol, and the preservative may be isothiazolone.

Hereinafter, the present invention will be described in detail by explaining preferred embodiments of the present invention.

< Example  1>

Stirring at a blending ratio of 15% by weight of water, 30% by weight of acrylic-silicone copolymer resin, 20% by weight of titanium dioxide, 20% by weight of sieving pigment, 10% by weight of hollow glass beads, and 5% by weight of other additives using the above raw materials. Dispersion to prepare a paint. The paint prepared in this way is a paint prepared to evaluate basic physical properties such as viscosity, non-volatile content, hiding rate, glossiness, etc. according to the standard of KS M 6010. Painting was performed to perform solar radiation reflectivity, spectral emissivity, thermal conductivity, infrared thermal imaging, and stain resistance.

< Example  2>

In the mixing ratio of Example 1, the paint was prepared by stirring and dispersing at a ratio of 10 wt% of the heat insulating pigment mica instead of the heat insulating pigment of the hollow glass beads. In addition, the coating material blended in Example 1 was coated with a middle coating layer, and the composite coating system was coated with the coating layer in Example 2 with a top coating layer. The physical properties and properties were evaluated in the same manner as in Example 1. It was.

< Example  3>

In the compounding ratio of Example 1, the extender pigment was reduced to 15% by weight, and instead of the heat insulating pigment of the hollow glass beads, the heat shield pigment mica was increased to 15% by weight to prepare a paint by stirring and dispersing. In addition, the coating material blended in Example 1 was coated with a middle coating layer, and the composite coating system was coated with the coating layer in Example 3 once with a top coat layer. The physical properties and properties were evaluated in the same manner as in Example 1. It was.

< Example  4>

In the blending ratio of Example 3, the mica was reduced to 10% by weight, and the mica was stirred and dispersed at 5% by weight to prepare a paint. Then, the coating material blended in Example 1 was coated with a middle coating layer, and the composite coating system coating the paint blended with Example 4 with a top coating layer was evaluated once in the same manner as in Example 1 to evaluate physical properties and properties. It was.

< Comparative example  1, 2>

Samhwa Paint's special school and heat shield coating products of Construction & Chemical Industry Co., Ltd., which are currently marketed as heat shield paints in the domestic market, were obtained and evaluated.

<Characteristic evaluation>

In the present invention, the basic physical properties of the paint, viscosity, non-volatile content, gloss, and hiding rate were evaluated by the test method of KS M 6010. Viscosity was measured by a Storm Viscometer according to KS M 5000 Test Method 2122. Non-volatile content was measured for 30 minutes at 110 ℃ according to the KS M ISO 2814 test method. Glossiness was evaluated using a glossmeter according to the KS M ISO 2813 test method. The concealment rate is made by using LENETA's concealment rate paper according to KS M ISO 2814 standard, and after measuring at least 16 hours at room temperature, the average reflectance (R _B ) of the black surface and the average reflectance (R _W ) of the white surface are respectively measured. Calculate as a percentage as

Concealment rate = R _B / R _W × 100

In the present invention, the solar reflectance was scanned at a speed of 500 nm / min. From 380 to 2500 nm using a UV-VIS-NIR spectrophotometer (Perkin-Elmer Lambda 900) according to the standards of KS L 2514, JIS A 5759. Reflectance was measured using an integrating sphere. At this time, the reflection angle was 8 ° and the inner surface of the integrating sphere was coated with a material called spectralon and 150mm in diameter was used. As a result of the measurement, the reflectance value of each wavelength band is calculated by calculating the total solar reflectance using the following formula and the thermal shielding performance is evaluated.

Ρ _e : Reflectance

Eλ: Standard spectrum distribution of the directly reaching relative value of solar radiation

Eλ ・ △ λ: Heavy weight coefficient, wavelength range from Annex 2 to KS L 2514 standard

            Use of 300 ~ 2500nm value

Ρ _{1, n} (λ): reflectance for each wavelength

In the present invention, the evaluation of the radiation characteristics of the infrared emitter is performed by calculating the ratio of the spectrum obtained by introducing the infrared infrared light into the infrared spectrophotometer at a sample at a certain temperature and a standard blackbody furnace of the same temperature to obtain the spectral emissivity of the sample surface. The infrared emission light was measured using a Fourier transform infrared spectrophotometer (FT-IR). In this experiment, a Fourier transform infrared spectrophotometer (FT-IR, MIDAC M2410-C, USA) was used to measure infrared emissivity by the direct method. Infrared emissivity is measured in the range of 3 ~ 22㎛ wavelength, and all spectra are measured by receiving 100 scans with resolution of 8cm ^-1 with MCT (HgCdTe) detector cooled by liquid nitrogen.

In the present invention, the infrared thermal imager detects the amount of infrared rays with an infrared camera and converts it to temperature in the principle that the material having an absolute temperature of 0 ° K or more emits infrared rays from the surface thereof, and the amount is proportional to the temperature. The temperature distribution on the surface is displayed as a thermal image. In order to measure the surface temperature of the paint according to the thermal insulation performance, the infrared thermal radiation temperature at the sample surface was evaluated by using an infrared thermal imaging camera (Thermovison A320, FLIR System, USA), and the surface temperature with the general external aqueous paint Evaluate the difference.

In the present invention, the thermal conductivity of the KS L 9016 standard is measured by measuring the heat flow rate passing through the test body using a heat exchanger method using a heat flow meter, and measuring the temperature difference at that time, and then calculating the thermal conductivity using the following formula.

l: thickness of the test specimen (m)

R _{c :} Thermal resistance of the test specimen

Q _! : Temperature of the hot surface of the test body

Q ₂ : Temperature of low temperature surface of test body

q: Heat flow rate (heat flow density) per unit area

K: sensitivity coefficient of heat flow meter

e: output of the heat flow meter

In the present invention, the fouling resistance is applied to the MDF plate at a constant coating thickness, and then dried at room temperature for 1 day, and heat-treated at 60 ° C. for 24 hours. Suspensions to be evaluated for stain resistance were prepared by mixing 25% by weight of carbon black and 75% by weight of ocher to prepare a suspension in water at a concentration of 1.0 g / l. The spillage of the suspension is allowed to flow for 10 minutes at a rate of 0.75 ± 0.05 L / min, and the sample surface is dried for 10 minutes in a dryer at 40 ° C. after the suspension flows. Test 10 cycles in this way to evaluate the color difference (ΔE) of the specimen before and after the test.

Evaluation item
Evaluation results Example 1 Example 2 Example 3 Example 4 Comparative Example 1 Comparative Example 2 Viscosity (K.U.) 110.0 109.8 109.2 108.7 127.8 82.3 Nonvolatile matter (%) 57.4 56.8 56.5 56.9 72.9 72.4 Concealment rate (%) 96.3 95.8 95.4 95.1 95.4 96.2 Glossiness (85 °) 1.4 3.9 5.5 6.0 0.9 99.9 Increment reflectance (%) 73.5 80.0 84.2 86.2 84.4 53.7 Spectral emissivity (%) 92.5 92.0 92.4 93.5 92.5 91.7 Infrared Thermal Image (℃) 44.5 42.8 41.2 40.5 42.0 45.2 Thermal Conductivity (W / mK) 0.09 0.10 0.10 0.10 0.12 0.34 Positive contact angle (°) 117 120 120 121 110 105 Pollution Resistance (△ E) 0.25 0.1 0.1 0.1 0.21 0.34 After pollution resistance evaluation
Increment reflectance (%) 68.2 79.8 82.0 85.5 75.2 40.5

As a result of comparing the property evaluation of the paint based on the standard of KS M 6010 in the characteristics evaluation results of Table 1, Examples 1, 2, 3, 4 Comparative Example 1 is satisfied, but Comparative 2 is a low viscosity, gloss to be. In the case of exterior paint that is painted on the exterior of a building, if a lot of gloss occurs, it may be a factor that obstructs the driver's vision by reflecting light.

As a result of the evaluation in the present invention, Example 1 shows that the thermal conductivity is low by using a hollow glass beads insulating heat insulation, but excellent in thermal insulation, but inferior in thermal insulation performance. In addition, when Example 1 using the heat insulation pigment with low thermal conductivity like Example 2, 3, and 4 is taken into consideration, and it is set as the composite coating system which top-coats the compounding paint which used the heat shield pigment, it exhibits heat insulation performance and heat insulation performance simultaneously. The result was obtained.

In particular, when the heat shield pigment mica is used as in Examples 2 and 3, the solar reflectance is increased to indicate the heat shielding performance, and the higher the mica content is, the higher the solar reflectance is. However, it can be seen that the heat shielding performance is increased more efficiently by using together with mica titanium as a result of Example 4 rather than using only mica.

Comparative Example 2 lacks the performance to be a heat shield paint, Comparative Example 1 has excellent heat insulating performance and thermal insulation performance, but the heat resistance is poor in accordance with the change over time due to contamination resistance. Comparing Examples 2, 3, and 4, by using the acrylic-silicon copolymer resin, it is excellent in fouling resistance by surface tension, and heat shielding performance can be maintained for a long time.

Claims (7)

delete delete delete 10 to 20% by weight of water, 20 to 40% by weight of acrylic-silicon copolymer, 10 to 30% by weight of mica titanium, 10 to 20% by weight of white pigment and 10 to 20% by weight of extender pigment 10 to 20% by weight of water, 10 to 30% by weight of acrylic-silicone copolymer, 10 to 30% by weight of hollow glass beads, 1 to 20% by weight of white pigment, and 10 to 20% by weight of extender pigment A coating method comprising the coating composition comprising 5 to 70% by weight of water, 20 to 90% by weight of acrylic-silicone copolymer, and 1 to 10% by weight of a silane coupling agent as an intermediate layer. delete delete delete

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