KR102360827B1 - High-performance heat shield paint and Paint constructing method using the same - Google Patents

Abstract

The present invention relates to a high functional heat shield paint and a paint construction method using the same, and more specifically relates to a high functional heat shield paint comprising a retro-reflection material and a paint construction method using a color change paint using a special pigment.

Description

High-performance heat shield paint and Paint constructing method using the same}

The present invention relates to a high-functional heat-shielding paint and a construction method using the same, and more particularly, to a high-functional heat-shielding paint containing a retroreflective material and a paint construction method using a color change paint using a special pigment.

Recently, the heat island phenomenon, in which the temperature in the center of the city is significantly higher than that in the surrounding areas, is emerging as a major social problem due to the increase in population and various artificial facilities due to urbanization, and the greenhouse effect. To solve this problem in developed countries, etc., while the construction of a low-carbon society is in full swing, heat-shielding paint is in the spotlight as a measure to alleviate the urban heat island effect and to save energy for large buildings.

However, the conventional heat-shielding paint mainly relies on reflection by color and has a limited color, and there is a problem in that heat-shielding performance cannot be sufficiently exhibited using only the reflection effect of sunlight.

In addition, as shown in FIG. 1, the white-based heat-shielding paint mainly used causes diffuse reflection to damage the surrounding high-rise buildings from glare caused by radiant light, and has a problem in that it cannot absorb heat in winter because it does not have a thermal insulation function. .

Accordingly, there is an urgent need for research on a heat-shielding material that can be used in a simple process in the paint field and can have excellent heat-shielding performance.

Republic of Korea Patent Registration No. 10-1762309 (published on July 27, 2017)

In order to solve the problems of the prior art as described above, an object of the present invention is to provide a high-functional heat-shielding paint in which glass beads are uniformly dispersed, and to provide a high-functional heat-shielding paint construction using the same.

The technical problems to be solved by the invention are not limited to the technical problems mentioned above, and other technical problems not mentioned will be clearly understood by those of ordinary skill in the art to which the present invention belongs from the description below. will be able

The high functional heat shielding paint of the present invention for solving the above problems includes an acrylic urethane resin, a retroreflective material, a UV blocker and a UV absorber.

In addition, an object of the present invention relates to a paint construction method using the high-functional heat-shielding paint, comprising: a first step of forming an undercoat layer by performing pretreatment using a polyurea resin; a second step of forming an intermediate layer by applying and drying a color change paint on the undercoat layer; and a third step of forming a top coat layer by applying and drying a high-functional heat shielding paint furnace on the middle layer.

By means of a solution to the above problem, the high-functional heat-shielding paint of the present invention exhibits an excellent heat-shielding effect, thereby reducing the average temperature through the heat-shielding of the roof to alleviate the urban heat island phenomenon.

In addition, it has the effect of minimizing the glare of surrounding buildings by preventing diffuse reflection.

In addition, it can be expressed in various colors despite the heat-shielding paint, and there is an effect of controlling the paint saturation by lowering the saturation to a color corresponding to the sun's heat to maximize the heat blocking efficiency, or by lowering the color saturation in winter.

In addition, there is an effect of increasing the aesthetics of the building through the application of a desired color.

1 is a view showing a glare phenomenon of a conventional heat-shielding paint.
2 is a view showing the retroreflection of the glass bead included in the high-functional heat-shielding paint of the present invention.
3 is a view showing a construction cross-section using the high-functionality heat-shielding paint construction method of the present invention.

Specific details including the problems to be solved, means for solving the problems, and effects of the invention for the present invention as described above are included in the embodiments and drawings to be described below. Advantages and features of the present invention and methods of achieving them will become apparent with reference to the embodiments described below in detail in conjunction with the accompanying drawings.

The paint construction method of the present invention constructs the paint in a three-layer structure of undercoat layer-middle layer-top coat layer, and to explain this in more detail, a first step of forming an undercoat layer by performing pretreatment using a polyurea resin; a second step of forming an intermediate layer by applying and drying a color change paint on the undercoat layer; and a third step of forming a top coat layer by coating and drying a high-functional heat-shielding paint furnace on the middle layer.

Drying in the second and/or third steps may be performed through natural drying, or may be performed through heat treatment.

The paint construction may construct the roof of the building and/or the exterior wall of the building.

In the first step, the undercoat layer is a pretreatment process for imparting a waterproof effect to the paint construction surface and improving the adhesion of the paint to the construction surface, and may be formed by applying a polyurea resin. .

Existing polyurea resins have to be applied to the construction surface through a high-temperature and high-pressure spray facility for the reaction of diamine and diisocyanate, but this work is very difficult and poor workability, so only a professional should install it. The resin can splatter to other places, causing a lot of damage. To compensate for this, an undercoat layer can be formed through a polyurea resin that can be applied with a roller.

The polyurea resin used for forming the undercoating layer of the present invention may be prepared by mixing and reacting one liquid containing a polyether polyol resin, an amine, a fluoropolymer, an additive and a solvent and two liquids containing an isocyanate.

Of the polyurea resin composition, the polyether polyol resin may preferably be a polyether polyol resin having a number average molecular weight of 200 to 2,500, and more preferably a polyether polyol resin having a number average molecular weight of 500 to 2,000. At this time, when the number average molecular weight of the polyether polyol resin is less than 200, the reactivity of the polyurea composition is too fast and the strength and hardness of the coating film are reduced. There may be a problem in that sufficient hardness cannot be obtained.

The polyether polyol resin content in the total weight % of the one-component polyurea resin is 40 to 50% by weight, preferably 42 to 48% by weight, more preferably 44 to 47% by weight, in this case, the polyether polyol resin If the content of is less than 40% by weight, the coating film may not be formed flat, and the reactivity with the second liquid, which is a curing agent containing isocyanate, may decrease, thereby reducing physical properties. Since the drying time is too fast, the smoothness of the formed undercoat layer may be deteriorated and workability may be deteriorated, so it is recommended to use it within the above range.

In one component, the amine is isophoronediamine, melamine, phenalkamine, methanediamine, ethylenediamine, triethylenetetramine, piperizine, propylenediamine, 1,4-butylenediamine, 1,3-diaminopentane, It is preferable to use at least one selected from 1,5-diaminomethylpentane, 1,3-xylenediamine, 1,6-hexamethylenediamine, diethylenetetramine, polyethyleneamine, diethyltoluenediamine, and dimethyltoluenediamine.

And, the amine content is 25 to 45% by weight, preferably 30 to 40% by weight of the total weight% of one solution, and at this time, if the amine content is less than 25% by weight, there may be a problem of low elasticity and elongation of the undercoat layer, , the curing rate may be slow and chemical resistance may be insufficient, and if the amine content exceeds 45% by weight, the curing rate may be too fast, and there may be problems such as deterioration of water resistance and poor appearance of the coating film.

In addition, among the one-component components, the fluorine polymer is used to impart a waterproof function to the undercoat layer and to improve stain resistance and chemical resistance, and is polyvinyl fluoride, polyvinylidene fluoride, polytetrafluoroethylene, polychlorotri Among fluoroethylene, perfluoroalkoxy polymer, fluorocarbon polymer, polyethylenetetrafluoroethylene, polyethylene chlorotrifluoroethylene, perfluoroelastomer, perfluorofluorether, perfluoropolyoxetane and fluoropolyimide One or more selected types may be used. And, the content of the fluoropolymer is 3 to 13% by weight, preferably 5 to 12% by weight, more preferably 6 to 10% by weight of the total weight of one solution, and in this case, if the fluoropolymer content is less than 3% by weight, stain resistance , lack of chemical resistance, color fading of high-functional heat shielding paint may easily occur, and if the fluorine polymer content exceeds 13 wt%, the flatness of the undercoat layer is rather deteriorated, and adhesion with the construction surface and/or intermediate layer Since there may be a problem of this deterioration, it is recommended to use it within the above range.

In addition, the additive in the one-component component may include at least one selected from an antifoaming agent, a leveling agent, a flow inhibitor and a dispersing agent, and the content of the additive is 0.5 to 2.0% by weight, preferably 0.7% by weight, based on the total weight of the one-component component -2.0 wt%, more preferably 1.0-2.0 wt%. At this time, if the additive content is less than 0.5% by weight, it may be difficult to planarize the undercoat layer, and if it is used in excess of 2.0% by weight, craters may occur on the surface of the undercoating layer, so it is recommended to use it within the above range.

In addition, the antifoaming agent may use a general antifoaming agent used in the art, and preferably, a four type antifoaming agent, a silicone type antifoaming agent, a polyether type antifoaming agent, a powder type antifoaming agent, a non-silicone type antifoaming agent and an emulsion type antifoaming agent. It may include one or more selected from, more preferably sodium stearate (Sodium Stearate), ethylene oxide copolymers (Ethylene Oxide Copolymers), stearyl ammonium chloride (Stearyl Ammonium Chloride) may include one or more selected from and is not limited thereto.

In addition, among the additives, the leveling agent may be a general leveling agent used in the art, and preferably includes at least one selected from a silicone leveling agent, an acrylic leveling agent, a polyacrylate leveling agent, polysiloxane, and polyacrylate. and may preferably include at least one selected from among polyether-modified dimethylpolysiloxane and glycol ether, but is not limited thereto.

In addition, among the additives, the flow inhibitor may use a general leveling agent used in the art, but is not particularly limited.

In addition, as the dispersant among the additives, a general dispersing agent used in the art may be used, and preferably one selected from styrene-maleic anhydride copolymer, maleic anhydride-acrylic copolymer and carboxylic acid salt and aliphatic polyether substituted with an acid group Dispersants comprising more than one species may be used.

In addition, the solvent in one component may include at least one selected from among butyl acetate, propylene glycol methyl ether acetate, methyl isobutyl ketone, acetone, isobutanol, xylene, and toluene, and the content of the solvent is 1 as described above. It is the remaining amount of 100% by weight other than the liquid components.

Among the polyurea resin components, the two components may include isocyanate as a curing agent, and in the present invention, the isocyanate is 2,4-toluene diisocyanate, 4,4-diphenylmethane diisocyanate, hexamethylene diisocyanate, p- It may include at least one selected from cyclohexyl isocyanate, isophorone diisocyanate, xylene diisocyanate, phenyl diisocyanate, 0-tolidine isocyanate and methylene diisocyanate.

It is appropriate that the undercoat layer formed using the polyurea resin described above has a thickness of 100 to 150 μm, preferably 110 to 140 μm.

Next, in the paint construction method of the present invention, the second step is a process of forming an intermediate layer by applying and drying a color change paint on the upper surface of the undercoat layer formed by pretreatment with a polyurea resin.

The intermediate layer is a layer that imparts a color change function according to temperature to the applied paint (3 layers) coating film, and provides hiding power and heat shielding performance.

The color change paint may include an acrylic polyol resin, a Zion pigment, an infrared reflective pigment, TiO ₂ powder, calcium carbonate (CaCO ₃ ), an additive, and a solvent. The color change paint has a color change temperature of 35 to 55 ℃, preferably 40 ℃ to 50 ℃, and if the temperature is less than 40 ℃, the temperature of the roof surface due to solar energy can easily rise within four seasons, so Absorption becomes difficult, and if the temperature is 50°C or higher, the color may change only at high temperatures in summer, which may reduce heat shielding performance. In addition, the temperature at which the color of the paint starts to change is 35° C., and when it exceeds 55° C., the color changes completely.

Among the color change paint components, the Zion pigment changes the saturation at a specific temperature, and serves to give the paint of the intermediate layer a function of changing the saturation at a specific temperature. In addition, the Zion pigment is a microcapsule, and an internal electron acceptor receives electrons from a donor to determine a color, and a film surrounding the inside blocks ultraviolet rays. At this time, the film surrounding the inside is a melamine material. As such a Zion pigment, one selected from a blue-based Zion pigment represented by the following Chemical Formula 1, a yellow-based Zion pigment represented by the following Chemical Formula 2, and a red-based Zion pigment represented by the following Chemical Formula 3 The above may be used, and preferably, it may include two or more selected from the blue-based Zion pigment, the yellow-based Zion pigment, and the red-based Zion pigment, and more preferably, the blue-based Zion pigment, the yellow-based Zion pigment, and The red-based Zion pigment may be included in a weight ratio of 1: 1.0 to 1.3: 0.2 to 0.5.

[Formula 1]

In Formula 1, R ¹ is a hydrogen atom or a C ₁ to C ₃ straight-chain alkyl group, preferably a C ₁ to C ₃ straight-chain alkyl group. And, R ² and R ³ in Formula 1 are independently a hydrogen atom, a C ₁ to C ₃ straight-chain alkyl group, -COOH or -COH, and preferably a hydrogen atom or a C ₁ to C ₂ straight-chain alkyl group. And, X in Formula 1 is -Br, -Cl or -I, preferably Br or -Cl.

[Formula 2]

In Formula 2, R ¹ and R ² are independently a hydrogen atom or a C ₁ to C ₃ straight-chain alkyl group, preferably a C ₁ to C ₃ straight-chain alkyl group, more preferably C ₂ to C ₃ It is a straight-chain alkyl group. And, R ³ in Formula 2 is -COOH, -COOCH ₃ or -COH, and preferably -COOH or -COOCH ₃ . In addition, X in Formula 2 is -Br, -Cl, or -I, preferably -Br or -Cl.

[Formula 3]

In Formula 3, R ¹ is =O, =NH, =NCH ₃ ,=NCH ₂ CH ₃ , =SH ₂ or =SHCH ₃ , preferably =O, =NH, or =SH ₂ , more preferably is =O or =NH. And, in Formula 3, R ² is a C ₁ ~ C ₃ alkoxy group, preferably a C ₁ ~ C ₂ alkoxy group.

And, the content of Zion pigment may include 15 to 25% by weight, preferably 17 to 23% by weight, more preferably 17.5 to 22.5% by weight of the total weight% of the color change paint, and the Zion pigment content is 15% by weight %, the effect of color change according to temperature change may be insignificant, and if the Zion pigment content exceeds 25 wt%, there may be a problem in that the hiding power is small, so it is recommended to use it within the above range.

In addition, among the color change paint components, the infrared reflective pigment includes chromium iron oxide, hematite, chromium green black, silica, iron oxide, titanium oxide, alumina, magnesium oxide, synthetic mica, and At least one selected from carbon black may be used. And, the content of the infrared reflective pigment may include 1 to 15% by weight, preferably 2 to 12% by weight, more preferably 4 to 10% by weight of the total weight% of the color change paint, and the infrared reflective pigment If the content is less than 5% by weight, the infrared reflection effect may be insufficient, and if the infrared reflection pigment content exceeds 15% by weight, there may be a problem of rather reducing the hiding power effect and color change effect of the Zion pigment. it's good

Among the color change paint components, the TiO ₂ powder serves to provide hiding power and heat shielding properties, and is 20 to 30% by weight, preferably 22 to 28% by weight, more preferably 23.5 to 23.5% by weight of the total weight% of the color change paint. 27.5 wt% may be included, and if the TiO ₂ powder content is less than 20 wt%, there may be a problem that the hiding power is small and the heat shielding performance is insufficient, and if the TiO ₂ powder content exceeds 30 wt%, the color expression is not good There may be problems, so it is recommended to use it within the above range.

Among the color change paint components, the calcium carbonate serves to increase moisture resistance and hiding power, and the amount used is 5 to 10 wt %, preferably 5 to 8 wt %, more preferably 5 to 10 wt % of the total weight of the color change paint may contain 5.5 to 7.5% by weight, and if the calcium carbonate content is less than 5% by weight, the hiding power may be small and there may be no effect of increasing moisture degradation. It is recommended to use within the above range because there may be problems with dryness.

Among the color change paint components, the additive may include at least one selected from an antifoaming agent, a leveling agent, a flow inhibitor, and a dispersing agent. It is the same as described in the additive of urea resin. And, the content of the additive may include 0.5 to 2.0% by weight, preferably 0.7 to 2.0% by weight, more preferably 1.0 to 2.0% by weight. At this time, if the additive content is less than 0.5% by weight, it may be difficult to planarize the intermediate layer coating film, and pores may be formed due to the generation of air bubbles. Therefore, it is recommended to use it within the above range.

The solvent in the color change paint component is used for dispersibility and miscibility of the paint component, and may include at least one selected from thinner, ketones, aromatic hydrocarbons, ethyl acetate, and butyl acetate. And, the content of the solvent is 3 to 12% by weight, preferably 5 to 12% by weight, more preferably 6.0 to 11.0% by weight of the total weight% of the color change paint, and if the solvent content is less than 3% by weight, the dispersion operation is It does not occur smoothly and may not form a smooth coating film, and when used in excess of 12% by weight, the coating film becomes uneven, and the drying time of the coating film is too long, which may deteriorate workability, so it is recommended to use it within the above range.

Among the color change paint components, the acrylic polyol resin serves as a binder, and may be an acrylic polyol resin containing as a main component one type of monomer selected from among methyl methacrylate monomer, ethyl methacrylate monomer, styrene monomer, and acrylate-based monomer, Preferably, a fluorine-containing acrylic polyol resin having a fluorine content of 8 to 15% by weight, a weight average molecular weight of 3,000 to 15,000, a hydroxyl content of 0.5 to 3.0%, and a glass transition temperature of 20 to 70°C may be used.

And, the content of the acrylic polyol resin is 100% by weight of the remaining balance in addition to the above-described Zion pigment, infrared reflective pigment, TiO ₂ powder, calcium carbonate (CaCO ₃ ), additives and solvents.

It is appropriate to form the intermediate layer formed by applying and drying the color change paint described above to have a thickness of about 100 to 150 μm, preferably 120 to 150 μm, and more preferably about 125 to 150 μm.

Next, the top coat protects the middle layer paint and serves to further increase the waterproof function.

The high-functional heat shielding paint used for forming the top coat includes an acrylic urethane resin, a retroreflective material, a UV blocker and a UV absorber.

Among the highly functional heat shielding paint components, the retroreflective material applicable in the art may be used, and preferably, a glass bead may be used. The glass bead is a material having retroreflection ability, as shown in FIG. 2, and the glass beads of the circle act as a lens to focus on the light coming from the outside, so that solar heat and radiation are incident through retroreflection. send it back

As the retroreflective material, glass beads having a particle diameter of 40 to 80 μm and a refractive index of 1.9 to 2.2, preferably glass beads having a particle diameter of 50 to 60 μm and a refractive index of 1.9 to 2.2 may be used. If the particle diameter of the glass beads is less than 40 μm, there may be a problem that aggregation between the glass beads occurs, and if it exceeds 80 μm, the glass beads in the top coat may not be uniformly applied and formed. In addition, if the refractive index of the glass bead is less than 1.9, the retroreflective performance may be too low and the shielding performance may be poor. have. In addition, as the retroreflective material, it is preferable to apply glass beads of a uniform size in terms of preventing diffuse reflection and uniform dispersibility in the topcoat layer.

The content of the retroreflective material in the high-functional heat shielding paint is 20 to 50% by weight, preferably 30 to 45% by weight, more preferably 32.0 to 40.0% by weight of the total weight, and in this case, if the retroreflector content is less than 20% by weight The top coat layer may not properly express the appropriate luminance and retroreflectance, and if it is used in excess of 50 wt%, aggregation between glass beads may occur, and the top coat layer may become unevenly formed. Formation may cause diffuse reflection, so it is recommended to use within the above range.

Among the highly functional heat shielding paint components, the sunscreen serves to protect the top coat from ultraviolet rays, and general sunscreen agents used in the art may be used, preferably a trisol-based sunscreen, resorcinol monobenzoate-based It may include at least one selected from sunscreen and hydroxy benzoate sunscreen, and more preferably, one selected from trisaryl-1,3,5-triazine and resorcinol monobenzoate sunscreen. may include more than one. And, the content of the sunscreen in the high-functional heat shielding paint is 5 to 20% by weight, preferably 5 to 15% by weight, more preferably 5 to 10% by weight, and in this case, if the content of the sunscreen is less than 1% by weight, There may be a problem in that it is difficult to obtain the effect of blocking, and if it is used in excess of 10% by weight, there may be a problem that the appearance of the coating film is deteriorated, so it is good to use it within the above range.

Among the high-functionality heat shielding paint components, the UV absorber serves to protect the top layer from UV rays together with the UV blocker, and a general UV absorber used in the art may be used, preferably benzotri, represented by the following Chemical Formula 4 A sol-based UV absorber may be included.

[Formula 4]

In formula (4), X is a hydrogen atom or -Cl, preferably -Cl. And, in Formula 4, R ¹ is a C ₁ ~ C ₅ linear alkyl group or a C ₃ ~ C ₅ pulverized alkyl group, preferably a C ₃ ~ C ₅ linear alkyl group. And, R ² in Formula 4 is a hydrogen atom, a C ₁ -C ₅ linear alkyl group or -COOH, and preferably a C ₁ -C ₂ linear alkyl group or -COOH.

And, the content of the ultraviolet absorber in the high-functional heat shielding paint is 5 to 20% by weight, preferably 5 to 15% by weight, more preferably 5 to 10% by weight, and in this case, if the content of the ultraviolet absorber is less than 1% by weight, There may be a problem in that it is difficult to obtain the effect of blocking, and if it is used in excess of 10% by weight, there may be a problem that the appearance of the coating film is deteriorated, so it is good to use it within the above range.

And, among the high-functional heat shielding paint components, an acrylic urethane resin serves as a binder, and the acrylic urethane resin is an acrylic prepared by polymerizing urethane prepolymer and 2-hydroxy ethylmethacrylate. A urethane resin, preferably an acrylic urethane resin prepared by polymerizing a urethane prepolymer and 2-hydroxyethyl methacrylate may be used. In addition, the content of the acrylic urethane resin in the high-functional heat-shielding paint is 100% by weight of the remaining amount in addition to the retroreflective material, the UV blocker, and the UV absorber described above.

It is appropriate to form the top coat layer formed by applying and drying the high-functional heat shielding paint described above to have a thickness of 50 to 100 μm, preferably 50 to 90 μm, and more preferably 60 to 90 μm.

The present invention will be described in more detail with reference to the following examples. However, the following examples are provided to aid understanding of the present invention, and should not be construed as limiting the scope of the present invention by the following examples.

[Example]

Preparation Example 1: Preparation of polyurea resin

(1) Preparation of 1 solution

45% by weight of polyether polyol having a number average molecular weight of 1,800 to 1,850, 35% by weight of 1,5-diaminomethylpentane, 8% by weight of polyethylenetetrafluoroethylene as a fluoropolymer, 0.12% by weight of ethylene oxide copolymer as an antifoaming agent, leveling agent One solution was prepared by mixing 0.96 wt% of polyether-modified dimethylpolysiloxane as a dispersant, 0.12 wt% of a styrene-maleic anhydride copolymer as a dispersant, and the remaining amount of a solvent (propylene glycol methyl ether acetate).

(2) Polyurea resin production

A polyurea resin was prepared by mixing and reacting hexamethylene diisocyanate as the first and second solutions (curing agent) in a weight ratio of 1:0.8.

Preparation Example 2: Preparation of color change paint

Zion pigment 20% by weight, infrared reflective pigment chromium iron oxide 5.6% by weight, TiO ₂ powder 25% by weight, calcium carbonate 6.5% by weight, sodium stearate 0.08% by weight as an antifoaming agent, glycol ether 1.05% by weight as a leveling agent, maleic anhydride as a dispersant - A color change paint was prepared by mixing and stirring 0.42 wt% of an acrylic copolymer, 8.2 wt% of ethyl acetate as a solvent, and the remaining amount of an acrylic polyol resin. In this case, as the acrylic polyol resin, a fluorine-containing acrylic polyol resin having a fluorine content of 10 to 12% by weight, a weight average molecular weight of 8,000 to 8,500, a hydroxyl content of 1.2 to 1.5%, and a glass transition temperature of 50 to 60° C. (Manufacturer: S Paint) Industrial Co., Ltd. product).

In addition, the Zion pigment includes a blue-based Zion pigment represented by the following Chemical Formula 1-1, a yellow-based Zion pigment represented by the following Chemical Formula 2-1, and a red-based Zion pigment represented by the following Chemical Formula 3-1: 1:1.12:0.38 It was used by mixing in a weight ratio.

[Formula 1-1]

In Formula 1-1, R ¹ is a methyl group, R ² and R ³ are ethyl groups, and X is -Cl.

[Formula 2-1]

In Formula 2-1, R ¹ and R ² are ethyl groups, R ³ is -COOH, and X is -Cl.

[Formula 3-1]

In Formula 3-1, R ¹ is =O, and R ² is an ethoxy group.

Preparation Example 3-1: Preparation of high-functional heat-shielding paint

36.5 wt% of glass beads having an average particle diameter of about 55 μm and a refractive index of 2.1 to 2.2, trisaryl-1,3,5-triazine (UV blocker) 7.5 wt%, benzotriazole-based UV absorber represented by the following Chemical Formula 4-1: 7.8 A high-functional heat shielding paint was prepared by mixing and stirring the weight % and the remaining amount of the acrylic urethane resin. In this case, as the acrylic urethane resin, an acrylic urethane resin prepared by polymerizing a urethane prepolymer and 2-hydroxyethyl methacrylate was used.

[Formula 4-1]

In Formula 4-1, X is a hydrogen atom, R ¹ is a butyl group, and R ² is -COOH.

Preparation Examples 3-2 to 3-3 and Comparative Preparation Examples 3-1 to 3-3

A high-functional heat-shielding paint was prepared in the same manner as in Preparation Example 3, but each of the heat-shielding paints was prepared with the composition shown in Table 1 below to prepare Preparation Examples 3-2 to 3-3 and Comparative Preparation Examples 3-1 to 3-3. carried out.

division
(weight%) glass bead ultraviolet ray
blocker ultraviolet ray
absorbent Acrylic Urethane
Suzy Preparation Example 3-1 36.5 7.5 7.8 remaining balance
100% by weight Preparation example 3-2 30.0 7.5 7.8 Preparation example 3-3 45.0 7.5 7.8 Comparative Preparation Example 3-1 18.9 9.0 9.0 Comparative Preparation Example 3-2 51.1 7.5 7.8 Comparative Preparation Example 3-3 36.5 7.5 0.2

Example 1

The polyurea resin prepared in Preparation Example 1 was applied to an iron plate of 30 × 30 cm in width and length with a roller, and then naturally dried to form an undercoating layer.

Next, after applying the color change paint prepared in Preparation Example 2 to the upper surface of the undercoat layer, it was dried naturally to form an intermediate layer.

Next, the high functional heat shielding paint prepared in Preparation Example 3-1 was applied to the upper surface of the intermediate layer, and then naturally dried to form a top coat layer, thereby forming a heat shielding paint film having a three-layer structure.

In this case, the thickness of the undercoat layer was about 110 μm, the thickness of the middle layer was about 130 μm, and the thickness of the top layer was about 70 μm.

Examples 2 to 3 and Comparative Examples 1 to 3

A heat-shielding paint film having a three-layer structure was formed on an iron plate with a width and length of 30 cm × 30 cm in the same method and thickness as in Example 1, but as shown in Table 2 below, the type of high-functional heat-shielding paint was different. .

division sub-layer middle class upper floor Example 1 Preparation Example 1 Preparation Example 2 Preparation Example 3-1 Example 2 Preparation example 3-2 Example 3 Preparation example 3-3 Comparative Example 1 Comparative Preparation Example 3-1 Comparative Example 2 Comparative Preparation Example 3-2 Comparative Example 3 Comparative Preparation Example 3-3

Experimental example: heat shielding performance, coating layer adhesive strength and

The heat shielding performance, the coating layer adhesive strength, and the light reflectance of the three-layered heat shielding paint films of Examples 1 to 3 and Comparative Examples 1 to 3 were measured.

(1) Paint film thermal insulation performance test

An untreated iron plate (control) and Example 1 were each heated at the same distance with a halogen 100 W lamp. After 1 hour, the surface temperature of the coating film was measured using a laser thermometer, and it is shown in Table 3.

(2) Measurement of adhesive strength of paint film

According to the test method of TEST METHOD B specified in ASTM D3359, scrape with a knife to make 25 flaws and adhere to the area with 3M transparent tape. The criteria were determined and evaluated, and are shown in Table 3.

(Evaluation method, 5B: no coating film peeling, 4B: coating film peeling less than 5%, 3B: coating film peeling less than 5 to 15%, 2B: coating film peeling less than 15 to 35%, 1B: coating film peeling 35 to less than 65%, 0B : Over 65% of film peeling)

(3) Measurement of light reflectance of high-functional thermal barrier paint

In accordance with JIS K 5602:2008, the light reflectance of the high-functional heat shielding paint used for forming the top coat of Example 1 was measured, and the results are shown in Table 3 below.

division surface temperature Adhesive strength ray reflectance 300~780nm 780~2500nm control 88℃ - - - Example 1 54℃ 4B 94.7% 87.6% Example 2 59℃ 5B 92.3% 85.1% Example 3 52℃ 4B 95.9% 89.0% Comparative Example 1 74℃ 5B 92.9% 85.7% Comparative Example 2 50℃ 2B 96.3% 90.1% Comparative Example 3 60℃ 4B 93.2% 86.5%

In the case of Comparative Example 1 using less than 20% by weight of glass beads, compared to Example 2, even though relatively more sunscreen and UV absorber were used, compared to Examples 1 and 2, the heat shielding property was relatively poor. There was a problem that the light reflectance improving effect was insufficient.

In the case of Comparative Example 2, in which the glass beads were used in excess of 50% by weight, compared with Example 3, heat shielding properties and light reflectance were very excellent, but as a result of using a relatively small amount of binder resin, the adhesive strength of the top coat was very There was a bad problem.

And, in the case of Comparative Example 3 using less than 1% by weight of the UV absorber, compared to Example 1, the heat shielding effect was rather poor.

On the other hand, Examples 1 to 3 were confirmed to have excellent heat shielding effect and adhesive strength, and excellent reflectance for visible light and infrared light.

Manufacturing example: Building roof paint construction

After cleaning the roof of the building, the polyurea resin prepared in Preparation Example 1 was coated with a roller on an area of 3 m in width and length of the roof of the building, and then naturally dried to form an undercoating layer.

Next, after applying the color change paint prepared in Preparation Example 2 to the upper surface of the undercoat layer, it was dried naturally to form an intermediate layer.

Next, the high-functional heat-shielding paint prepared in Preparation Example 3 was applied to the upper surface of the intermediate layer, and then naturally dried to form a top coat layer, and a three-layer structure of paint was applied.

In this case, the thickness of the undercoat layer was about 110 μm, the thickness of the middle layer was about 130 μm, and the thickness of the top layer was about 70 μm.

As such, those skilled in the art to which the present invention pertains will understand that the above-described technical configuration of the present invention may be implemented in other specific forms without changing the technical spirit or essential characteristics of the present invention.

Therefore, the embodiments described above are to be understood as illustrative and not restrictive in all respects, and the scope of the present invention is indicated by the following claims rather than the above detailed description, and the meaning and scope of the claims and their equivalents Any changes or modifications derived from it should be construed as being included in the scope of the present invention.

1: middle class
2: top layer

Claims (7)

acrylic urethane resin, retroreflective material, sunscreen and UV absorber,
A high-functional heat shielding paint comprising 20 to 50% by weight of the retroreflective material, 5 to 20% by weight of a sunscreen, 5 to 20% by weight of an ultraviolet absorber, and the remaining amount of the acrylic urethane resin.
According to claim 1,
The retroreflective material is a highly functional heat-shielding paint, characterized in that it comprises glass beads having a particle diameter of 40 ~ 80㎛ and a refractive index of 1.9 ~ 2.2.
3. The method of claim 2,
The high-functional heat-shielding paint is a high-functional heat-shielding paint, characterized in that it is a top coat paint for a paint construction of a three-layer structure including a lower coat layer, a middle coat layer, and a top coat layer.
In the paint construction of a three-layer structure,
A first step of forming an undercoat layer by performing pretreatment using a polyurea resin;
a second step of forming an intermediate layer by applying and drying a color change paint on the undercoat layer; and
The third step of forming a top coat layer by applying and drying a high-functional heat-shielding paint on the upper portion of the intermediate layer;
The high-functional heat-shielding paint,
It is a top coat paint for paint construction with a three-layer structure including an undercoat layer, an intermediate layer, and a top coat layer, and 20 to 50 wt% of a retroreflective material, 5 to 20 wt% of a sunscreen, 5 to 20 wt% of a UV absorber, and the remaining amount of acrylic A method for constructing a high-functional heat-shielding paint comprising a urethane resin, wherein the retroreflective material comprises glass beads having a particle diameter of 40 to 80 μm and a refractive index of 1.9 to 2.2.
5. The method of claim 4,
The polyurea resin is a polyether polyol resin 40 to 50% by weight, amine 25 to 45% by weight, fluoropolymer 3 to 13% by weight, additive 0.5 to 2.0% by weight, one solution containing the remaining amount of the solvent; and two liquids containing isocyanate; it is prepared by mixing and reacting,
The additive comprises at least one selected from an antifoaming agent, a leveling agent, a flow inhibitor, and a dispersing agent.
5. The method of claim 4,
The color change paint is Zion pigment 15 to 25% by weight, infrared reflective pigment 5 to 15% by weight, TiO ₂ powder 20 to 30% by weight, calcium carbonate (CaCO ₃ ) 5 to 10% by weight, solvent 3 to 12% by weight, Additive 0.05 to 2.0% by weight and the remaining amount of the acrylic polyol resin,
The Zion pigment is at least one selected from a blue-based Zion pigment represented by the following Chemical Formula 1, a yellow-based Zion pigment represented by the following Chemical Formula 2, and a red-based Zion pigment represented by the following Chemical Formula 3 including,
The infrared reflective pigment includes at least one selected from chromium iron oxide, hematite, chromium green black, silica, iron oxide, titanium oxide, alumina, magnesium oxide, synthetic mica, and carbon black. includes,
The additive comprises at least one selected from an antifoaming agent, a leveling agent, a flow inhibitor, and a dispersing agent;
[Formula 1]

In Formula 1, R ¹ is a hydrogen atom or a C ₁ to C ₃ straight-chain alkyl group, R ² and R ³ are independently a hydrogen atom, a C ₁ to C ₃ straight-chain alkyl group, —COOH or —COH, and X is -Br, -Cl or -I,
[Formula 2]

In Formula 2, R ¹ and R ² are independently a hydrogen atom or a C ₁ -C ₃ straight-chain alkyl group, R ³ is -COOH, -COOCH ₃ or -COH, and X is -Br, -Cl or -I is,
[Formula 3]

In Formula 3, R ¹ is =O, =NH, =NCH ₃ ,=NCH ₂ CH ₃ , =SH ₂ or =SHCH ₃ , and R ² is a C ₁ ~C ₃ alkoxy group.
7. The method of claim 6,
The thickness of the undercoat layer is 100 ~ 150㎛, the thickness of the middle layer is 100 ~ 150㎛, the top coat layer thickness is 50 ~ 100㎛ high functional heat-shielding paint construction method.

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