KR20210052682A - High thermal shield, durability, thermal durability urethane waterproof coating containing carbon fiber composition - Google Patents

Abstract

A coating film waterproofing material excellent in heat shielding and waterproofing properties according to the present invention includes a first polyurethane resin layer containing a carbon fiber composite material, and a second polyurethane resin layer containing a surface-modified heat shielding pigment on the first polyurethane resin layer. The coating film waterproofing material having excellent heat shielding and waterproofing properties according to the present invention has excellent water resistance and weather resistance, and has excellent adhesion properties.

Description

High thermal shield, durability, thermal durability urethane waterproof coating containing carbon fiber composition}

The present invention relates to a coating waterproofing material excellent in heat shielding and waterproofing properties.

As climate change caused by global warming becomes a reality, efforts to conceal greenhouse gases are being made in various fields. In addition to efforts to reduce carbon dioxide emissions from large-scale industrial facilities such as factories, efforts are also being made to reduce greenhouse gas emissions in densely populated large cities.

In particular, in Korea, energy consumption for cooling in summer and heating in winter is remarkably increasing due to the four seasons. Accordingly, there may be a problem of increasing carbon dioxide emissions by utilizing resources such as power, natural gas, and oil.

In the case of summer, the use of cooling devices is remarkably increasing due to the increase in temperature, and it is inevitable that the amount of energy consumed by the cooling device increases as the indoor temperature increases. Concrete buildings, which occupy most of the architectural structures, absorb infrared rays, and become a factor that increases the indoor temperature rapidly as well as the exterior walls of the building.

Accordingly, studies on paint compositions for preventing absorption of infrared rays from roofs and roofs of buildings are being conducted, but the heat shielding effect is insignificant.

It is an object of the present invention to provide a coating waterproofing material having excellent heat shielding and waterproofing properties having excellent heat shielding effect and waterproofing effect.

Another object of the present invention is to provide a waterproof coating film excellent in water resistance and heat shielding and water resistance.

Another object of the present invention is to provide a coating waterproofing material having excellent heat shielding and waterproofing properties with excellent adhesion.

The coating waterproofing material having excellent heat shielding and waterproofing properties according to the present invention includes a first polyurethane resin layer containing a carbon fiber composite material; And

It characterized in that it comprises a; a second polyurethane resin layer containing a heat shielding pigment surface-modified on the first polyurethane resin layer.

In the coating film waterproofing material having excellent heat shielding and water resistance according to an embodiment of the present invention, the first polyurethane resin layer includes a first subject including a first diisocyanate compound, a first polyalkylene glycol, and a first polyhydric alcohol; And a carbon fiber composite material, a first filler, and a first curing agent including a first catalyst.

In the coating waterproofing material having excellent heat shielding and waterproofing properties according to an embodiment of the present invention, the carbon fiber composite material may include clay and carbon fibers.

In the coating waterproofing material having excellent heat shielding and water resistance according to an embodiment of the present invention, the carbon fiber may have a cross-sectional diameter of 3 to 10 µm and a length of 20 to 150 µm.

In the coating waterproofing material having excellent heat shielding and water resistance according to an embodiment of the present invention, the clay may be one or two or more selected from montmorillonite, bentonite, nontronite, and bidelite.

In the coating film waterproofing material having excellent heat shielding and water resistance according to an embodiment of the present invention, the first subject is 200 to 350 parts by weight of first polyalkylene glycol and 1 to 20 parts by weight of polyhydric alcohol based on 100 parts by weight of the first diisocyanate compound. Includes,

The first curing agent may be characterized in that it contains 5 to 20 parts by weight of the carbon fiber composite material relative to 100 parts by weight of the first filler.

In the coating waterproofing material having excellent heat shielding and water resistance according to an embodiment of the present invention, the second polyurethane resin layer has a viscosity of 1500 to 4500 mPa·s, and a second diisocyanate-based liquid having a density of 1.10 to 1.25 g/cm 3 A second subject comprising the compound; And a second curing agent including an acrylic polyol resin, a heat shielding pigment, and a second dispersant; may be prepared by mixing.

In the coating film waterproofing material having excellent heat shielding and waterproofing properties according to an embodiment of the present invention, the second diisocyanate-based compound may be characterized in that the isocyanate group content is 21 to 24%.

In the coating waterproofing material having excellent heat shielding and water resistance according to an embodiment of the present invention, the heat shielding pigment may be surface-modified with a vinylsilane-based surface modifier.

In the coating waterproofing material having excellent heat shielding and waterproofing properties according to an embodiment of the present invention, the second subject includes 150 to 250 parts by weight of a solvent based on 100 parts by weight of the liquid second diisocyanate-based compound, and the second curing agent is acrylic It may include 0.05 to 1 parts by weight of a heat shielding pigment and 30 to 60 parts by weight of a colored pigment based on 100 parts by weight of the resin.

The coating waterproofing material having excellent heat shielding and waterproofing properties according to the present invention includes a first polyurethane resin layer containing a carbon fiber composite material; And a second polyurethane resin layer including a heat-shielding pigment surface-modified on the first polyurethane resin layer, including excellent heat shielding and waterproofing effects, excellent water resistance and weather resistance, and excellent adhesion.

Advantages and features of the embodiments of the present invention, and a method of achieving them will be apparent with reference to the embodiments described later in detail together with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but may be implemented in a variety of different forms, and only these embodiments make the disclosure of the present invention complete, and common knowledge in the technical field to which the present invention pertains. It is provided to completely inform the scope of the invention to those who have, and the invention is only defined by the scope of the claims. The same reference numerals refer to the same elements throughout the specification.

The coating waterproofing material having excellent heat shielding and waterproofing properties according to the present invention includes a first polyurethane resin layer containing a carbon fiber composite material; And a second polyurethane resin layer including a heat shielding pigment surface-modified on the first polyurethane resin layer.

In the coating waterproofing material according to the present invention, the first polyurethane resin layer includes a carbon fiber composite material, and the second polyurethane resin layer includes a heat-shielding pigment surface-modified, so that the first polyurethane resin layer and the second polyurethane resin layer There is an advantage of inducing even dispersion of the first polyurethane resin layer and improving the bonding strength between the second polyurethane resin layer and exhibiting more excellent heat shielding performance.

The coating waterproofing material having excellent heat shielding and water resistance according to an embodiment of the present invention preferably includes a first polyurethane resin layer in a lower layer, and a second polyurethane resin layer may be formed in contact with the upper portion of the first polyurethane resin layer. have. More preferably, it may further include a polyurethane primer layer formed on the substrate, there is an advantage that the formation of the primer layer can protect the substrate and further strengthen the binding force with the first polyurethane resin layer.

The coating waterproofing material having excellent heat shielding and waterproofing properties according to the present invention includes a first polyurethane resin layer containing the carbon fiber composite material.

Specifically, in the coating film waterproofing agent according to an embodiment of the present invention, the first polyurethane resin layer includes a first subject including a first diisocyanate compound, a first polyalkylene glycol, and a first polyhydric alcohol; And a carbon fiber composite material, a first filler, and a first curing agent including a first catalyst. In the coating waterproofing material according to an embodiment of the present invention, the first polyurethane resin layer is prepared by mixing the first main material and the first curing agent, so that the bonding strength with the second polyurethane resin layer is excellent, and the adhesion is excellent. There is an advantage that it is possible to manufacture a coating waterproofing material. At this time, the first main agent and the first curing agent may be mixed in the same amount, but it is obvious that the mixing ratio may vary depending on the usage and purpose of the coating film to be produced.

In the coating waterproofing material according to an embodiment of the present invention, the first diisocyanate compound included in the first subject includes a diisocyanate group, and in the case of a conventional diisocyanate compound used in a urethane-based paint, it can be used without limitation. , The present invention is not limited thereto. However, the diisocyanate-based compound for intermediate use may be a diisocyanate-based compound including an aromatic ring such as toluene diisocyanate.

In addition, the first subject includes a first polyalkylene glycol and a first polyhydric alcohol in addition to the first diisocyanate compound. The first polyalkylene glycol may be preferably one or more selected from polyethylene glycol and collypropylene glycol, and the polyhydric alcohol is a specific and non-limiting example, such as ethylene glycol, propylene glycol, 1,4-butanediol, 1,6 -Hexanediol, 1,2-hexanediol, 1,3-hexanediol, 2-methyl-1,3-propanediol, 2,5-hexanediol, 2-methyl-1,3-pentanediol, 2-methyl -2,4-pentanediol, tripropylene glycol, and may be one or more selected from glycerol, but the present invention is not limited thereto. The first subject may include 200 to 350 parts by weight of polyalkylene glycol and 1 to 20 parts by weight of a first polyhydric alcohol based on 100 parts by weight of the first diisocyanate compound. If the polyalkylene glycol content is included in a small amount than the appropriate range, uniform mixing of the first main material and the first curing agent may be inhibited, and a problem in that the thickness of the coating film is too thin due to low viscosity may occur. When the content of the polyalkylene glycol is contained in a larger amount than the low fixed range, it may be difficult to form a uniform and smooth coating film. In addition, if the first polyhydric alcohol is added in a small amount less than the appropriate range, there is a risk that unreacted diisocyanate will remain during curing. have.

In the coating waterproofing material according to an embodiment of the present invention, the first agent may further include a plasticizer and a solvent. In this case, the plasticizer may be used without limitation a plasticizer material or a commercial plasticizer used for a paint, and the solvent may be ethyl acetate, benzene, toluene, or xylene, but the present invention is not limited thereto. The plasticizer may be included in an amount of 50 to 150 parts by weight based on 100 parts by weight of the first diisocyanate compound, and the solvent may be included in an amount of 10 to 40 parts by weight based on 100 parts by weight of the first diisocyanate compound.

In the coating waterproofing material according to an embodiment of the present invention, the first curing agent may include a carbon fiber composite material, a first filler, and a first catalyst.

In the coating waterproofing material according to an embodiment of the present invention, the first curing agent includes a first filler. At this time, the filler can be used without limitation if it is a filler commonly used for paints, but calcium carbonate may be preferably used. At this time, the filler may have an average particle diameter of 2 to 15 µm, more specifically 3 to 12 µm, and in this range, it is possible to produce a coating film having excellent physical properties while inducing even mixing with the carbon composite material.

The carbon fiber composite material may include clay and carbon fiber, and may be manufactured through a process such as milling by mixing clay and carbon fiber, but the present invention is not limited thereto. In the coating waterproofing material according to an embodiment of the present invention, since the first polyurethane resin layer includes a carbon fiber composite material, uniform dispersion of carbon fibers is induced, and the second polyurethane layer is heated by sunlight or the like. In this case, there is an advantage of promoting heat transfer to the substrate to prevent peeling or lifting of the first polyurethane layer and the second polyurethane layer due to a difference in thermal expansion coefficient. At this time, the carbon fiber composite material may include 20 to 50% by weight of clay and the remaining amount of carbon fiber.

In this case, the carbon fiber may be used without limitation, if it is typically used in the coating composition, and specifically, milled carbon fiber may be used. As a specific and non-limiting example, the carbon fiber may have a cross-sectional diameter of 3 to 10 µm and a length of 30 to 150 µm. By satisfying such an appropriate range, the effect of inducing dispersion by clay is maximized, and there is an advantage of not damaging the aesthetic sense of the coating film.

In addition, the clay may be used without limitation if it is a clay containing smectite-based clay. In the case of using smectite-based clay, uniform mixing with the first diisocyanate is induced, and a suitable viscosity is formed for application, thereby remarkably improving workability. As a specific and non-limiting example, the smectite-based clay may be one or two or more selected from montmorillonite, bentonite, nontronite, and bidelite, and more preferably montmorillonite or bentonite. , The present invention is not limited thereto.

The carbon fiber composite material may contain 5 to 20 parts by weight relative to 100 parts by weight of the filler, and when a small amount is added than the above-described appropriate range, it is difficult to achieve the effect of the carbon fiber composite addition, and when a large amount is added than the appropriate range, the adhesion of the coating film There is a risk of degradation.

The first curing agent according to an embodiment of the present invention may include a first catalyst. In this case, the first catalyst may be used without limitation if it is a catalyst capable of polymerizing the first diisocyanate-based compound, and preferably, a metal complex-based catalyst may be used. The catalyst may be included in an amount of 0.1 to 2 parts by weight based on 100 parts by weight of the filler, and when it is included in a small amount than the above-described range, there is a problem that polymerization is delayed or unpolymerized diisocyanate is generated, and when a large amount of the catalyst is added, it is added. Although the effect of increasing the polymerization rate due to is insignificant, there may be a problem that the production cost increases.

In the waterproof coating material according to an embodiment of the present invention, the first curing agent may include a crosslinking agent, and in this case, the crosslinking agent may be used without limitation in the case of a crosslinking agent for a conventional polyurethane containing two or more amine groups. As an example, 4,4'-methylene-bis-2-chloroaniline (4,4'-methylene-bis-2-chloroaniline, MOCA) or the like may be used, but the present invention is not limited thereto. The crosslinking agent may be included in an amount of 1 to 10 parts by weight relative to 100 parts by weight of the filler, and when a small amount is added, even mixing between the first main agent and the first curing agent may be inhibited, and when a large amount is added, the remaining second polyhydric alcohol It may cause deterioration of the properties of the coating film.

The first curing agent may also include a plasticizer, and the plasticizer may use a plasticizer that is the same as or different from that of the first subject, and the present invention is not limited thereto. The plasticizer may be included in an amount of 5 to 25 parts by weight relative to 100 parts by weight of the filler, and satisfies this range to prevent a decrease in hardness or strength of the coating film while improving flexibility due to the plasticizer.

The first curing agent may also include a second polyalkylene glycol. In this case, the second polyalkylene glycol may use the same compound as the first polyalkylene glycol, but the present invention is not limited thereto. The second polyalkylene glycol may be included in 1 to 10 parts by weight relative to 100 parts by weight of the filler, and by satisfying this appropriate range, it is possible to prevent a decrease in the mixing speed due to the difference in viscosity between the first main material and the first curing agent.

The first curing agent may further include a colored pigment, and in this case, titanium dioxide or barium sulfate may be used as the colored pigment, but the present invention is not limited thereto. The colored pigment may be included in an amount of 0.5 to 5 parts by weight based on 100 parts by weight of the filler, and may be added in an appropriate range to improve strength.

The first curing agent may further include a dispersant, and the dispersant may be a commercial dispersant of BYK, but the present invention is not limited thereto. Specifically, the dispersant may be included in an amount of 0.05 to 1 part by weight based on 100 parts by weight of the filler. If a small amount of the dispersant is added out of the appropriate range, the dispersing efficiency of the pigment is greatly degraded, causing the pigment to re-collect easily, causing a cratering in the coating film, poor abrasion resistance of the coating film, and reduced gloss. I can. In addition, when excessively included, the hiding power of the coating film may decrease and the price may increase due to an excessive increase in transparency.

The first curing agent may further include an anti-settling agent, and the anti-settling agent may use one or two or more selected from bentonite, sepiolite, kaolinite, and the like, but the present invention is not limited thereto. The anti-settling agent may be included in an amount of 0.1 to 3 parts by weight relative to 100 parts by weight of the filler, and if it is contained less than the appropriate range, the precipitation of the pigment cannot be prevented. There is a problem to degrade.

The first curing agent may further include an antifoaming agent, and the antifoaming agent may use one or two or more selected from silicone-based, mineral oil-based, and polymer-based antifoaming agents, but the present invention is not limited thereto. The antifoaming agent may be included in an amount of 0.05 to 1 parts by weight relative to 100 parts by weight of the filler, and if the antifoaming agent is contained in less than an appropriate range, the defoaming action may be insignificant, resulting in a problem that air bubbles are included in the coating film. There is a risk of this uneven coating.

In the coating waterproofing material according to an embodiment of the present invention, the first curing agent may further include a solvent, and the solvent may be the same as the solvent included in the first subject, but the present invention is not limited thereto. The solvent may be added without limitation within a range for controlling the concentration of the main substance, but as a specific and non-limiting example, the solvent may be added in an amount of 1 to 10 parts by weight based on 100 parts by weight of the filler. When an excessively small amount of the solvent is added, it may cause a decrease in workability due to an increase in viscosity, and when a large amount is added, a problem in that the prepared first polyurethane layer becomes too thin may occur.

The coating waterproofing material having excellent heat shielding and waterproofing properties according to the present invention includes a second polyurethane resin layer including a heat shielding material having a surface-modified surface on the first polyurethane resin layer.

Specifically, the second polyurethane resin layer has a viscosity of 1500 to 4500 mPa·s, a density of 1.10 to 1.25 g/cm 3 of a liquid second main material including a liquid second diisocyanate-based compound; And a second curing agent including an acrylic polyol resin, a heat shielding pigment, and a dispersant. Coating waterproofing material according to the present invention has the advantage of showing excellent heat shielding effect and waterproofing effect by including the above-described second subject and the second curing agent.

Specifically, as described above, a liquid preparation having a viscosity of 1500 to 4500 mPa·s, a density of 1.10 to 1.25 g/cm 3, preferably a viscosity of 1650 to 4000 mPa·s, and a density of 1.14 to 1.20 g/cm 3 2 By including a diisocyanate-based compound, not only does it exhibit excellent waterproofing ability, but also has an advantage in that it improves construction convenience because it has excellent spreadability during the construction of a coating film. Advantageously, the diisocyanate-based compound may have an isocyanate group content of 21 to 24%, and satisfies the above-described range, so that it is possible to form a solid coating film with excellent waterproofing effect. In this case, the content of isocyanate groups may be obtained by dividing the total average molecular weight by the sum of atomic weights of NCO groups and the number of isocyanate groups.

In the coating waterproofing material according to an embodiment of the present invention, the second subject may include 150 to 250 parts by weight of a solvent based on 100 parts by weight of the liquid second diisocyanate-based compound. At this time, the solvent can be used without limitation if it is an organic solvent commonly used in paint compositions. As a specific and non-limiting example, the solvent may be ethyl acetate, toluene, xylene, or the like, but the present invention is not limited thereto. As a most preferred example, the second subject may contain 30 to 60 parts by weight of ethyl acetate and 100 to 200 parts by weight of xylene, and more preferably 100 parts by weight of the liquid second diisocyanate-based compound. It may contain 35 to 44 parts by weight of ethyl acetate and 120 to 180 parts by weight of xylene compared to the liquid second diisocyanate-based compound, and in such a range, the viscosity of the coating composition is controlled to an appropriate level to prevent uniform application. Can be prevented.

In the coating waterproofing material according to an embodiment of the present invention, the second curing agent includes an acrylic polyol resin. In the heat shielding coating composition according to the present invention, since the second curing agent contains an acrylic polyol resin, the acrylic polyol resin and the isocyanate group are bonded to each other when the urethane is formed by mixing with the second main agent, so that the urethane resin and the acrylic resin are covalently bonded. It may be characterized in that it is combined through, and accordingly, there is an advantage that it is possible to manufacture a strong and strong coating film against external impacts.

Specifically, the acrylic polyol resin may have a molecular weight of 1000 to 5000, preferably 2000 to 4500, and a hydroxyl value of 40 to 70 mg KOH/g, preferably 45 to 60 mg KOH/g. In this range, the acrylic resin and the urethane resin induce a uniform distribution in the coating film, and there is an advantage of minimizing unreacted isocyanate.

In the coating waterproofing material according to an embodiment of the present invention, the heat shielding pigment may be surface-modified with a vinylsilane-based surface modifier. Through such surface modification, dispersibility with the above-described acrylic polyol resin can be remarkably improved, and even when stored for a long period of time, formulation problems such as agglomeration of particles do not occur, and stable phase maintenance is possible.

Specifically, the vinylsilane-based surface modifier can be used without limitation in the case of a compound having a molecular weight of 400 or less including a vinyl group and a silane group, and as a specific example, the vinylsilane-based surface modifier is vinyl triethoxysilane, vinyl trime. It may be one or two or more selected from oxysilane, vinylchlorosilane, methacryloxypropyl triethoxysilane, and methacryloxypropyl triethoxysilane.

At this time, the heat shielding pigment may be used without limitation if it is a pigment having a function of emitting infrared rays that is commonly used. Preferably, the heat shielding pigment may include one or two or more selected from iron oxide or chromium oxide, titanium oxide, tin oxide, zinc oxide, magnesium oxide, zirconium oxide, cerium oxide, and antimony oxide. That is, in the most preferred embodiment, the heat shielding pigment may be one obtained by surface modification of the above-described iron oxide or chromium oxide with the above-described vinylsilane-based surface modifier.

In the coating waterproofing material according to an embodiment of the present invention, the second curing agent may further include a colored pigment. In this case, a white or milky pigment may be used as the coloring pigment, and specifically, a rutile type titanium dioxide may be used, but the present invention is not limited thereto.

In the coating waterproofing material according to an embodiment of the present invention, the second curing agent may further include one or more additives selected from a dispersant, an anti-settling agent, an antioxidant, a UV stabilizer, a leveling agent, a solvent, and an antifoaming agent. At this time, it is apparent that the amount of the additives added may vary depending on the type of each additive, but as a specific and non-limiting example, 0.1 to 5 parts by weight of each of 100 parts by weight of the acrylic polyol resin may be added.

As a preferred example, the second agent may contain 0.05 to 1 part by weight of a surface-modified heat shielding pigment based on 100 parts by weight of an acrylic polyol resin, and more preferably 0.1 to 0.5 parts by weight. If the heat shielding pigment is included in less than the above range, the heat shielding performance may be deteriorated, and if it is applied in excess than the above range, the top coat base coat and top coat clear coat may rise up to provide a cloudy appearance as a whole.

The dispersant may be used alone or in common, such as DISPERBYK-9076 or DISPERBYK-9077 of BYK-Chemie, but is not limited thereto. However, when a small amount of the dispersant is added out of the appropriate range, the dispersing efficiency of the pigment is greatly reduced, causing the pigment to re-collect easily, causing cratering on the coating film when the paint is used, poor abrasion resistance of the coating film, and reduced gloss. Can cause. In addition, when excessively included, the hiding power of the coating film may decrease and the price may increase due to an excessive increase in transparency. Accordingly, the dispersant is preferably contained in an amount of 0.1 to 1.5 parts by weight based on 100 parts by weight of the acrylic polyol resin.

The anti-settling agent may be included in 1 to 5 parts by weight based on 100 parts by weight of the acrylic polyol resin, more preferably 1.5 to 4 parts by weight. The precipitation inhibitor may be an organic or inorganic material, and preferably, one or two or more selected from bentonite, sepiolite, kaolinite, and the like may be used as an inorganic material. When the anti-precipitation agent is contained in less than the appropriate range, it is not possible to prevent the precipitation of the pigment, and in the oral cavity exceeding the appropriate range, flowability deteriorates, resulting in a problem of lowering work efficiency.

The UV stabilizer may be included in 0.5 to 3 parts by weight, more preferably 1 to 3 parts by weight, based on 100 parts by weight of the acrylic polyol resin, and the UV stabilizer is a UV stabilizer such as benzophenone-based, benzotriazole-based, triazine-based, etc. However, the present invention is not limited thereto. If it is included in a small amount than the above-described range, durability may be significantly reduced in a rooftop environment exposed to direct sunlight, and if a large amount is added than the above-described range, there is a problem that physical properties such as water resistance and acid resistance may be deteriorated.

The antioxidant may be included in an amount of 0.05 to 0.5 parts by weight based on 100 parts by weight of the acrylic polyol resin, and one or two or more compounds selected from alkylphenols, alkylenebisphenols, alkylphenolthioethers and aromatic amines are used, or commercially available paints For example, an antioxidant may be used, but the present invention is not limited thereto. When the antioxidant is included in less than an appropriate range, the durability of the coating film may be significantly deteriorated, and when a large amount of the antioxidant is added, the coating film surface may be uneven.

The antifoaming agent may be included in an amount of 0.5 to 3 parts by weight based on 100 parts by weight of the acrylic polyol resin, and at least one selected from a silicone-based antifoaming agent, a mineral oil-based antifoaming agent, and a polymer-based antifoaming agent may be used, but the present invention is not limited thereto. When the antifoaming agent is included in less than the appropriate range, the defoaming action is insignificant, and thus air bubbles may be included in the coating film, and when a large amount of the antifoaming agent is added, there is a risk that a coating film having an uneven surface may occur.

The leveling agent may be included in an amount of 0.05 to 0.5 parts by weight based on 100 parts by weight of the acrylic polyol resin, and one selected from fluorine-modified polyacrylate, alkyl polyacrylate, polyalkyl vinyl ether, cellulose acetate butyrate, dimethyl polysiloxane, methylphenyl polysiloxane, etc. Alternatively, two or more may be used, but the present invention is not limited thereto. When the leveling agent is included in less than the appropriate range, problems may occur in smoothness, and when a large amount of the leveling agent is added, problems such as cracks may occur in the coating film.

As described above, in the present invention, a top coat prepared by mixing the second subject and the second curing agent is referred to as a top coat, and the top coat may be prepared by mixing the second subject and the second curing agent in the same ratio.

Hereinafter, the present invention will be described in detail by examples and comparative examples. The following examples are only intended to aid understanding of the present invention, and the scope of the present invention is not limited by the following examples.

[Production Example 1]

1. Preparation of paint for forming the first polyurethane resin layer

Each of the first subject and the first curing agent were prepared to satisfy the composition of Table 1 below. At this time, the carbon fiber was used having a cross-sectional diameter of 7 μm and a length of 60 μm.

Substance name Addition amount (g) Topic 1 Toluene diisocyanate (TDI, KPX) 19 Polypropylene glycol (KONIX PP-2000, KPX) 51 Crosslinking agent (1,4-butanediol) 1.5 Plasticizer (LGflex GL500, LG Chemical) 23.5 Solvent (Toluene) 5 First hardener Crosslinking agent (MOCA) 3 Plasticizer (LGflex GL500, LG Chemical) 7 Solvent (Xylene) 3 Polypropylene glycol (KONIX PP-3000, KPX) 25 Coloring Pigment (TiO ₂ ) 2 Dispersant (Byk-9076, BYK) 0.2 Milled carbon fiber & MMT (montmorillonite) 5 Calcium carbonate (Omyacarb 10-CN, Omiya Korea) 53.5 Anti-settling agent (Pangel AD) 0.7 Defoamer (BYK-066N, BYK) 0.2 Bismuth catalyst (catalyst, true positive) 0.4

2. Preparation of heat-shielding pigments surface-modified with vinylsilane-based surface modifiers

First, 8 g of vinyltriethoxysilane and 70 g of tetrahydrofuran were mixed and impregnated with 10 g of Black 6340, a heat shielding pigment, followed by stirring at 35° C. for 1 hour, and then separating the solid component and drying at 30° C. for 24 hours. Thus, a heat shielding pigment surface-modified with a vinylsilane-based surface modifier was prepared.

3. Preparation of coating material for forming the second polyurethane resin layer

To satisfy the composition of Table 2 below, the composition of the second main material and the second curing agent were mixed to prepare a second main material and a second curing agent. At this time, the liquid diisocyanate was used as a liquid second diisocyanate-based compound having an isocyanate group content of 22%, a viscosity of about 2500 mPa·s, and a density of 1.16 g/cm 3, and the acrylic polyol resin has a molecular weight of about 3000, and a hydroxyl value of 56 mg KOH/g was used.

Substance name Addition amount (g) No. 1 Liquid diisocyanate compound 40 Solvent (Toluene) 60 Part 2 Acrylic polyol resin 58 Coloring Pigment (TiO ₂ ) 23.88 Surface-modified heat shielding pigment (Black 3300) 0.2 Dispersant (Disper BYK-9076, BKY) 0.6 Anti-settling agent (PANGEL AD) 1.1 Antioxidant (MIANTO S, Miwon Corporation) 0.2 UV stabilizer (CINASORB-1600) 0.9 Leveling agent (EFKA FL 3670, BASF) 0.1 Solvent (Toluene) 3 Solvent (Xylene) 2.8 Solvent (di-methyl carbonate) 10 Defoamer (EFKA SI 2038, BASF) 0.35

[Production Example 2]

It was prepared in the same manner as in Preparation Example 1, but instead of the carbon fiber & MMT 5g milled with the first hardener, only 2.5 g of carbon milled fiber was added to prepare a paint.

[Production Example 3]

It was prepared in the same manner as in Preparation Example 1, but a coating was prepared using a carbon fiber having an average length of 180 µm milled with the first curing agent.

[Production Example 4]

It was prepared in the same manner as in Preparation Example 1, but the average cross-sectional diameter of the carbon fiber milled with the first curing agent was 2.4 µm and the length was 20 µm to prepare a paint.

[Production Example 5]

Prepared in the same manner as in Preparation Example 1, wherein the liquid second diisocyanate has an isocyanate group content of 22.3%, a viscosity of about 3000 mPa·s, and a density of 1.18 g/cm 3. Was used.

[Production Example 6]

A heat shielding coating composition was prepared in the same manner as in Preparation Example 1, except that a liquid second diisocyanate-based compound having an isocyanate group content of 17.6%, a viscosity of about 1300 mPa·s, and a density of 1.13 g/cm 3 was used. .

[Production Example 7]

The same as in Preparation Example 1, except that the isocyanate group content is 19.6%, dissolved in n-butyl isocyanate solvent, solid content is about 90%, and viscosity is about 400 diisocyanate-based compound is used. The composition was prepared.

[Production Example 8]

Preparation Example 1 was prepared in the same manner as in Preparation Example 1, except that Black 6340, which was not surface-modified with a vinylsilane-based surface modifier, was mixed. `

[Production Example 9]

It was prepared in the same manner as in Preparation Example 1, except that 0.3 g of the surface-modified heat-shielding pigment was mixed, and a heat-shielding coating composition was prepared in the same manner as in Preparation Example 1.

[Production Example 10]

A heat shielding coating composition was prepared in the same manner as in Preparation Example 1, except that 1 g of the heat shielding pigment was mixed with the surface-modified heat shielding pigment.

[Production Example 11]

It was prepared in the same manner as in Preparation Example 1, but a heat shielding coating composition was prepared using an acrylic polyol resin having a molecular weight of about 1000 and a hydroxyl value of 58 mg KOH/g.

[Production Example 12]

It was prepared in the same manner as in Preparation Example 1, but a heat shielding coating composition was prepared using an acrylic polyol resin having a molecular weight of about 10000 and a hydroxyl value of 49 mg KOH/g.

[Production Example 13]

It was prepared in the same manner as in Preparation Example 1, but instead of the acrylic polyol resin, an acrylic resin having the same molecular weight of about 4500 was added, and 10 g of polypropylene glycol was further added to the second agent to prepare a heat shielding coating composition.

Confirmation of physical properties of the manufactured coating film

1.Check water resistance

The first main material and the first curing agent are mixed and coated so that the thickness is 50 µm on an acrylic plate having a width of 20 × 20 cm, and after drying in natural air for 24 hours, the second main material and a second curing agent are mixed to give a thickness. A coating film was formed by applying the coating material of Preparation Example so that the thickness was 40 μm, and left to stand in the shade for a week to prepare a completely dried coating film.

After impregnating the prepared coating film in purified water for 10 days, visually observed whether lifting, cracking, cracking, etc. of the coating occurred, and this was shown in Table 3 on a 5-point scale. (5 points: Lifting, cracking, cracking of the coating film, etc.) Almost no appearing, similar to the coating after drying~1 point: A lot of peeling, cracking, and cracking of the coating occur)

2. Check adhesion

In accordance with ASTM D3359, the coating film prepared in the same manner as in 1 above 1 was scraped with a knife to cross each other at 2cm intervals, and 25 cells were made, and then adhered to the area with 3M transparent tape, followed by 6 steps according to the degree of separation. Evaluation was performed, and the results are shown in Table 3. (5B: no peeling occurred at all-0B: more than 66% peeling occurred)

3. Thermal insulation performance evaluation

Prepare a box made of styrofoam material with a thickness of 30 cm × 20 cm × 20 cm, measured from the outside, and each 1 cm thick with an open roof. Here, a metal plate made of stainless steel having a size that completely covers the upper surface is prepared, and the medium coat prepared in Preparation Example is applied to a thickness of 40 µm, dried in natural wind for 24 hours, and then the top coat is made to have a thickness of 50 µm. It was applied and dried in natural air for 7 days to prepare a completely cured coating. Thereafter, the metal plate was placed on the box made of styrofoam, and air inflow was blocked as much as possible using a glue gun, and ultraviolet rays were irradiated with an infrared lamp (Osram, 250W) at a place 30 cm higher than the metal plate, and The temperature change by time was measured using and the results are shown in Table 3.

Physical property measurement Heat shielding performance evaluation Water resistance Adherence Initial temperature 30 minutes later Manufacturing Example 1 5 5B 21.9 29.4 Manufacturing Example 2 3 2B 20.6 31.6 Manufacturing Example 3 3 2B 21.2 32.2 Manufacturing Example 4 3 3B 20.4 32.7 Manufacturing Example 5 5 5B 22.0 30.7 Manufacturing Example 6 4 2B 21.6 32.6 Manufacturing Example 7 3 3B 22.2 33.5 Manufacturing Example 8 2 2B 21.8 33.4 Manufacturing Example 9 2 2B 21.5 38.5 Manufacturing Example 10 4 2B 22.1 36.5 Manufacturing Example 11 3 2B 22.4 34.6 Manufacturing Example 12 3 3B 21.7 36.9 Manufacturing Example 13 3 2B 22.0 37.0

Referring to Table 3, the heat shielding coating composition prepared in Preparation Examples 1 and 2 has excellent water resistance and acid resistance, and exhibits excellent durability even when directly contacting weakly acidic rainwater, making it suitable for use on exterior walls such as building roofs and roofs. In addition, it can be seen that the adhesion property is excellent, so that even when an external impact or the like is applied, the coating film can be maintained for a long period of time, and the heat shielding performance is the most excellent.

Claims (10)

A first polyurethane resin layer containing a carbon fiber composite material; And
A coating film waterproofing material having excellent heat shielding and water resistance, comprising: a second polyurethane resin layer containing a heat shielding pigment surface-modified on the first polyurethane resin layer. The method of claim 1,
The first polyurethane resin layer includes a first main material including a first diisocyanate compound, a first polyalkylene glycol, and a first polyhydric alcohol; And a carbon fiber composite material, a first filler, and a first curing agent including a first catalyst. The method of claim 1,
The carbon fiber composite material is a coating waterproofing material having excellent heat shielding and waterproofing properties including clay and carbon fiber. The method of claim 3,
The carbon fiber has a cross-sectional diameter of 3 to 10 µm and a length of 20 to 150 µm. The method of claim 3,
The clay is a coating film waterproofing material having excellent heat shielding and waterproofing properties comprising one or two or more selected from montmorillonite, bentonite, nontronite, and bidelite. The method of claim 2,
The first subject comprises 200 to 350 parts by weight of a first polyalkylene glycol and 1 to 20 parts by weight of a polyhydric alcohol based on 100 parts by weight of the first diisocyanate compound,
The first curing agent comprises a carbon fiber composite material of 5 to 20 parts by weight relative to 100 parts by weight of the first filler. The method of claim 1,
The second polyurethane resin layer has a viscosity of 1500 to 4500 mPa·s and a density of 1.10 to 1.25 g/cm 3 of a liquid second main material including a liquid second diisocyanate-based compound; And a second curing agent including an acrylic polyol resin, a heat shielding pigment, and a second dispersant; a coating waterproofing material having excellent heat shielding and waterproofing properties. The method of claim 7,
The second diisocyanate-based compound is a coating film waterproofing material having excellent heat shielding and waterproofing properties, characterized in that the isocyanate group content is 21 to 24%. The method of claim 7,
The heat shielding pigment is a coating film waterproofing material having excellent heat shielding and water resistance, which is surface-modified with a vinylsilane-based surface modifier. The method of claim 7,
The second subject includes 150 to 250 parts by weight of a solvent based on 100 parts by weight of the liquid second diisocyanate-based compound, and the second curing agent is 0.05 to 1 parts by weight based on 100 parts by weight of the acrylic resin, and 30 to 60 Coating waterproofing material with excellent heat shielding and waterproofing properties containing a colored pigment in parts by weight.