KR102300388B1 - High thermal shield, durability, thermal durability urethane waterproof coating containing carbon fiber composition - Google Patents

Abstract

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

Description

A urethane coating waterproofing material with improved durability, heat resistance and heat shielding performance including a carbon fiber composite {High thermal shield, durability, thermal durability urethane waterproof coating containing carbon fiber composition}

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

As climate change due to global warming becomes a reality, efforts to reduce greenhouse gas emissions are underway in various fields. In addition to efforts to reduce carbon dioxide emissions from large-scale industrial facilities such as factories, efforts are being made to reduce greenhouse gas emissions in large cities with dense populations.

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

In the case of summer, the use of air-conditioning equipment is remarkably increased due to a rise in temperature, and as the indoor temperature increases, it is inevitable that the energy consumption of the air-conditioning equipment increases. Concrete buildings, which occupy most of the building structure, absorb infrared rays, which causes a rapid rise in the indoor temperature as well as the outer walls of the building.

Accordingly, research is being conducted on a paint composition for preventing the absorption of infrared rays on the roof of a building, the roof, etc., but there is a slight limitation in the heat shielding effect.

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

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

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

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

and a second polyurethane resin layer containing a surface-modified heat-shielding pigment on the first polyurethane resin layer.

In the coating film waterproofing material having excellent heat shielding and waterproofing properties according to an embodiment of the present invention, the first polyurethane resin layer may include a first main agent 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 may be prepared by mixing.

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

In the coating waterproofing material having excellent heat shielding and waterproofing properties according to an embodiment of the present invention, the first subject is 200 to 350 parts by weight of the 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. includes,

The first curing agent may include 5 to 20 parts by weight of the carbon fiber composite material based on 100 parts by weight of the first filler.

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 diisocyanate-based waterproofing material having excellent heat shielding and waterproofing properties according to an embodiment of the present invention. a second subject comprising a 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 have an isocyanate group content of 21 to 24%.

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

In the coating film 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. Based on 100 parts by weight of the resin, 0.05 to 1 parts by weight of the heat shielding pigment and 30 to 60 parts by weight of the colored pigment may be included.

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

Advantages and features of embodiments 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. However, the present invention is not limited to the embodiments disclosed below, but may be implemented in various different forms, and only these embodiments allow the disclosure of the present invention to be complete, and common knowledge in the art to which the present invention pertains It is provided to fully inform those who have the scope of the invention, and the present invention is only defined by the scope of the claims. Like reference numerals refer to like elements throughout.

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

The coating film waterproofing material according to the present invention includes a first polyurethane resin layer including a carbon fiber composite material, and a second polyurethane resin layer including a surface-modified heat-insulating pigment, whereby the first polyurethane resin layer and the second polyurethane resin layer There is an advantage that can induce even dispersion of the first polyurethane resin layer and the second polyurethane resin layer to improve the bonding strength, and exhibit better heat shielding performance.

The coating film waterproofing material having excellent heat shielding and waterproofing properties according to an embodiment of the present invention preferably includes a first polyurethane resin layer on 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 can protect the substrate by the formation of the primer layer and further strengthen the binding force with the first polyurethane resin layer.

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

Specifically, in the coating waterproofing agent according to an embodiment of the present invention, the first polyurethane resin layer may include a first main agent 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 may be prepared by mixing. In the coating film waterproofing material according to an embodiment of the present invention, the first polyurethane resin layer is prepared by mixing the first main agent and the first curing agent, so that the binding force with the second polyurethane resin layer is excellent and the adhesion is excellent. There is an advantage in that it is possible to manufacture a coating film waterproofing material. In this case, the first main agent and the first curing agent may be mixed in equal amounts, but it is apparent that the mixing ratio may vary depending on the intended use and purpose of the prepared coating film.

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 if it is a conventional diisocyanate-based compound used in urethane-based paints, it can be used without limitation. , the present invention is not limited thereto. However, the intermediate diisocyanate-based compound 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 at least one selected from polyethylene glycol and colipropylene glycol, and the polyhydric alcohol is a specific and non-limiting example of 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 It may be one or two or more selected from -2,4-pentanediol, tripropylene glycol and 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 the first polyhydric alcohol based on 100 parts by weight of the first diisocyanate compound. When the polyalkylene glycol content is included in a small amount than the appropriate range, uniform mixing of the first main agent and the first curing agent may be inhibited, and a problem that the thickness of the coating film becomes too thin due to low viscosity may occur, and the first When the content of polyalkylene glycol is included in a larger amount than the low 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 than the appropriate range, there is a risk that unreacted diisocyanate remains during curing, and if it is added in a larger amount than the appropriate range, a decrease in the uniformity of the coating film due to the unreacted first polyhydric alcohol may occur. have.

In the coating film 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 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 waterproofing coating film according to an embodiment of the present invention, the first curing agent includes a first filler. In this case, the filler can be used without limitation if it is a filler commonly used in paints, but calcium carbonate may be preferably used. In this case, 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, by including the carbon fiber composite material, the first polyurethane resin layer induces uniform dispersion of carbon fibers and at the same time, the second polyurethane layer is heated by sunlight. In this case, there is an advantage in that it is possible to prevent peeling or lifting of the first polyurethane layer and the second polyurethane layer due to a difference in thermal expansion coefficient by promoting heat transfer to the substrate. At this time, the carbon fiber composite material may include 20 to 50% by weight of clay and the remaining amount of carbon fibers.

In this case, the carbon fiber can be used without limitation if it is commonly used in the coating composition, and specifically, milled carbon fiber can 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 dispersion-inducing effect of clay is maximized and the aesthetics of the coating film is not impaired.

In addition, the clay may be used without limitation in the case of clay including smectite-based clay. When the smectite-based clay is used, it induces uniform mixing with the first diisocyanate and forms an appropriate viscosity for application, thereby significantly improving workability. As a specific and non-limiting example, the smectite-based clay may be one or two or more selected from montmorillonite, bentoanite, nontronite and weidellite, and more preferably, montmorillonite or bentonite, but , the present invention is not limited thereto.

The carbon fiber composite material may be included in 5 to 20 parts by weight based on 100 parts by weight of the filler, and when added in a smaller amount than the above-described appropriate range, it is difficult to achieve an effect by adding the carbon fiber composite material, and when added in a larger amount 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 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-mentioned range, there is a problem that polymerization is delayed or non-polymerized diisocyanate occurs, and the catalyst is added when a large amount is added Although the effect such as an increase in polymerization rate is insignificant, there may be a problem in 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 can be used without limitation if it is a general crosslinking agent for polyurethane containing two or more amine groups. As an example, 4,4'-methylene-bis-2-chloroaniline (4,4'-methylene-bis-2-chloroaniline, MOCA) 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 based on 100 parts by weight of the filler, and when added in a small amount, even mixing between the first main agent and the first curing agent may be inhibited. It may cause deterioration of the physical properties of the coating film.

The first curing agent may also include a plasticizer, and the plasticizer may use the same or different plasticizer as that of the first subject, but the present invention is not limited thereto. The plasticizer may be included in 5 to 25 parts by weight based on 100 parts by weight of the filler, and by satisfying this range, it is possible to prevent a decrease in hardness or strength of the coating film while promoting the effect of improving flexibility by 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 based on 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 of the first main agent 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 the strength.

The first curing agent may further include a dispersant, and as the dispersant, a commercially available dispersant manufactured by BYK, etc. may be used, 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. When the dispersant is added in a small amount out of the appropriate range, the dispersion efficiency of the pigment is greatly reduced, thereby easily causing the re-agglomeration of the pigment. can In addition, when included excessively, the hiding power of the coating film may be lowered and the price may be increased due to excessive increase in transparency.

The first curing agent may further include a precipitation inhibitor, and the precipitation inhibitor may be one or two or more selected from bentonite, sepiolite, kaolinite, and the like, but the present invention is not limited thereto. The precipitation inhibitor may be included in an amount of 0.1 to 3 parts by weight relative to 100 parts by weight of the filler, and when it is included less than the appropriate range, it is not possible to prevent the precipitation of the pigment, and the flowability is deteriorated in the oral cavity exceeding the appropriate range, so that the work efficiency is deteriorated. There is a problem of lowering

The first curing agent may further include an anti-foaming agent, and the anti-foaming agent may be one or two or more selected from silicone-based, mineral oil-based and polymer-based anti-foaming agents, but the present invention is not limited thereto. The antifoaming agent may be included in an amount of 0.05 to 1 part by weight based on 100 parts by weight of the filler, and when the antifoaming agent is included in less than the appropriate range, the defoaming action is insignificant, so that a problem of air bubbles being included in the coating film may occur. There is a risk that this non-uniform coating film may occur.

In the waterproofing coating 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 the range for adjusting the concentration of the subject, 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 if a large amount is added, a problem in that the first polyurethane layer to be manufactured becomes too thin may occur.

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

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

Specifically, as described above, the liquid agent has 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 the diisocyanate-based compound, it exhibits excellent waterproofing ability, and has excellent spreadability during the construction of the coating film, thereby improving the convenience of construction. Preferably, the diisocyanate-based compound may have an isocyanate group content of 21 to 24%, and it is possible to form a strong coating film with an excellent waterproof effect by satisfying the above-described range. In this case, the content of isocyanate groups may be obtained by dividing the total average molecular weight by the sum of the 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. In this case, if the solvent is an organic solvent commonly used in the coating composition, it can be used without limitation. As a specific and non-limiting example, ethyl acetate, toluene, and xylene may be used as the solvent, 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, more preferably 100 parts by weight, based on 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 this range, the viscosity of the coating composition is controlled to an appropriate level to prevent uniform application. can prevent

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

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 in that unreacted isocyanate can be minimized.

In the coating film waterproofing material according to an embodiment of the present invention, the heat-shielding pigment may be surface-modified with a vinyl silane-based surface modifier. Through such surface modification, dispersibility with the above-described acrylic polyol resin can be significantly improved, and even when stored for a long time, there is an advantage in that formulation problems such as aggregation of particles do not occur, and a stable phase can be maintained.

Specifically, the vinyl silane-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 vinyl silane-based surface modifier includes vinyl triethoxysilane, vinyl trime It may be one or two or more selected from oxysilane, vinylchlorosilane, methacryloxy propyl triethoxysilane, and methacryloxypropyl triethoxysilane.

In this case, the heat-shielding pigment can be used without limitation if it is a pigment having a function of emitting infrared rays that are 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 surface-modified with the above-mentioned iron oxide or chromium oxide with the above-mentioned vinylsilane-based surface modifier.

In the coating film waterproofing material according to an embodiment of the present invention, the second curing agent may further include a coloring pigment. In this case, a white or milky white pigment may be used as the coloring pigment, and specifically, 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, a precipitation inhibitor, an antioxidant, a UV stabilizer, a leveling agent, a solvent, an antifoaming agent, and the like. In this case, although it is obvious that the amount of the additive may vary depending on the type of each additive, 0.1 to 5 parts by weight may be added, respectively, based on 100 parts by weight of the acrylic polyol resin as a specific and non-limiting example.

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

The dispersant may be used alone or in combination with DISPERBYK-9076 or DISPERBYK-9077 manufactured by BYK-Chemie, but is not limited thereto. However, when a small amount of the dispersant is added out of the appropriate range, the dispersion efficiency of the pigment is greatly reduced, thereby easily causing the re-agglomeration of the pigment. may cause In addition, when included excessively, the hiding power of the coating film may be lowered and the price may be increased due to excessive increase in transparency. Accordingly, the dispersant is preferably included 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 an amount of 1 to 5 parts by weight, more preferably 1.5 to 4 parts by weight, based on 100 parts by weight of the acrylic polyol resin. The precipitation inhibitor may be an organic or inorganic material, and preferably, one or two or more selected from bentonite, sepiolite, kaolinite, etc. may be used as an inorganic material. When the precipitation inhibitor is included in less than the appropriate range, it is not possible to prevent the precipitation of the pigment, and the flowability is deteriorated in the oral cavity exceeding the appropriate range, thereby reducing 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 benzophenone-based, benzotriazole-based, triazine-based UV stabilizer. However, the present invention is not limited thereto. When a small amount is included in the above range, durability may be significantly reduced in a rooftop environment illuminated by direct sunlight.

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 more compounds selected from alkylphenol, alkylenebisphenol, alkylphenolthioether and aromatic amine are used, or a commercially available paint An antioxidant may be used, but the present invention is not limited thereto. If the antioxidant is included in less than the appropriate range, the durability of the coating film may be significantly reduced, and if a large amount of the antioxidant is added, the coating film surface may not be uniform.

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 one or more selected from a silicone-based antifoaming agent, a mineral oil-based antifoaming agent, a polymer-based antifoaming agent, and the like 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, which may cause a problem of air bubbles being included in the coating film.

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, polyacrylic acid alkyl, polyalkyl vinyl ether, cellulose acetate butyrate, dimethyl polysiloxane, methylphenyl polysiloxane, etc. Or 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, a problem 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, what is prepared by mixing the second main agent and the second curing agent is referred to as a top coat, and the top coat may be prepared by mixing the second main agent and the second curing agent in the same ratio.

Hereinafter, the present invention will be specifically described by way of Examples and Comparative Examples. The examples below are only for helping understanding of the present invention, and the scope of the present invention is not limited by the examples below.

[Production Example 1]

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

A first main agent and a first curing agent were prepared to satisfy the composition of Table 1 below. In this case, carbon fibers having a cross-sectional diameter of 7 μm and a length of 60 μm were used.

substance name Addition (g) 1st topic 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 Toluene 5 first curing agent Crosslinking agent (MOCA) 3 Plasticizer (LGflex GL500, LG Chemical) 7 Solvent (Xylene) 3 Polypropylene glycol (KONIX PP-3000, KPX) 25 Color 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, catalytic catalytic) 0.4

2. Manufacture of heat-shielding pigment surface-modified with a vinyl silane-based surface modifier

First, 8 g of vinyl triethoxysilane and 70 g of tetrahydrofuran were mixed, impregnated with 10 g of Black 6340, a heat-shielding pigment, stirred at 35 ° C. for 1 hour, and then the solid component was separated and dried at 30 ° C. for 24 hours. Thus, a heat-shielding pigment surface-modified with a vinyl silane-based surface modifier was prepared.

3. Preparation of paint for forming the second polyurethane resin layer

A second main agent and a second curing agent were prepared by mixing the compositions of the second main agent and the second curing agent, respectively, to satisfy the composition shown in Table 2 below. At this time, the liquid diisocyanate had an isocyanate group content of 22%, a viscosity of about 2500 mPa·s, and a density of 1.16 g/cm 3 of a liquid second diisocyanate-based compound was used, and the acrylic polyol resin had a molecular weight of about 3000 and a hydroxyl value of 56 mg KOH/g was used.

substance name Addition (g) Article 1 Liquid diisocyanate compound 40 Toluene 60 second agent Acrylic Polyol Resin 58 Color pigment (TiO ₂ ) 23.88 Surface-modified heat-shielding pigment (Black 3300) 0.2 Dispersant (Disper BYK-9076, BKY) 0.6 Precipitation inhibitor (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 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, except that 2.5 g of only carbon milled fiber was added instead of 5 g of carbon fiber & MMT milled in the first curing agent to prepare a paint.

[Production Example 3]

It was prepared in the same manner as in Preparation Example 1, but the carbon fiber milled in the first curing agent had an average length of 180 μm to prepare a paint.

[Production Example 4]

It was prepared in the same manner as in Preparation Example 1, but the average cross-sectional diameter of the carbon fibers milled in 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, but 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 of a liquid second diisocyanate-based compound was used.

[Production Example 6]

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

[Production Example 7]

In the same manner as in Preparation Example 1, except that a diisocyanate-based compound having an isocyanate group content of 19.6%, a dissolved state in an n-butyl isocyanate solvent, a solid content of about 90%, and a viscosity of about 400 was used. A composition was prepared.

[Production Example 8]

It 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 with Preparation Example 1 and a heat-shielding paint composition was prepared. `

[Production Example 9]

A heat-shielding paint composition 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.

[Production Example 10]

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

[Production Example 11]

It was prepared in the same manner as in Preparation Example 1, except that an acrylic polyol resin having a molecular weight of about 1000 and a hydroxyl group of 58 mg KOH/g was used to prepare a thermal barrier coating composition.

[Production Example 12]

It was prepared in the same manner as in Preparation Example 1, except that an acrylic polyol resin having a molecular weight of about 10000 and a hydroxyl group of 49 mg KOH/g was used to prepare a thermal barrier coating composition.

[Production Example 13]

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

Confirmation of physical properties of the manufactured coating film

1. Check water resistance

The first main agent and the first curing agent are mixed and applied to an acrylic plate having a width of 20 × 20 cm so that the thickness is 50 μm, dried in natural air for 24 hours, and then the second main agent and the second curing agent are mixed to make the thickness A coating film was formed by applying the coating material of Preparation Example so that the α was 40 μm, and a completely dried coating film was prepared by leaving it in the shade for a week.

After impregnating the prepared coating film in purified water for 10 days, it was visually observed whether floating, cracking, cracking, etc. occurred in the coating film and shown in Table 3 on a 5-point scale. (5 points: coating film lifting, cracking, cracking, etc.) It hardly appears, and it is similar to the coating film after drying~1 point: the coating film floats, cracks, and cracks occur a lot)

2. Check adhesion

According to ASTM D3359, in accordance with ASTM D3359, the coating film prepared in the same way as in the first waterproofing check was scraped with a knife to make 25 squares, and then adhered to the area with 3M transparent tape. was evaluated, and the results are shown in Table 3. (5B: No peeling at all ~ 0B: More than 66% peeling occurs)

3. Thermal performance evaluation

Prepare a box made of Styrofoam material measuring 1cm in thickness with an open roof and width × length × height of 30 cm × 20 cm × 20 cm measured from the outside. Here, prepare a stainless steel metal plate of a size that completely covers the upper surface, apply the middle coat prepared in Preparation Example to a thickness of 40 µm, dry it in natural air for 24 hours, and apply the top coat to a thickness of 50 µm It was applied and dried in natural air for 7 days to prepare a completely cured coating film. Thereafter, the metal plate was placed on the box made of Styrofoam, the 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 height of 30 cm in the vertical direction than the metal plate, and a digital thermometer. was used to measure the temperature change over time, and the results are shown in Table 3.

physical property measurement Thermal performance evaluation water resistance adherence initial temperature 30 minutes later Preparation Example 1 5 5B 21.9 29.4 Preparation 2 3 2B 20.6 31.6 Preparation 3 3 2B 21.2 32.2 Preparation 4 3 3B 20.4 32.7 Preparation 5 5 5B 22.0 30.7 Preparation 6 4 2B 21.6 32.6 Preparation 7 3 3B 22.2 33.5 Preparation 8 2 2B 21.8 33.4 Preparation 9 2 2B 21.5 38.5 Preparation 10 4 2B 22.1 36.5 Preparation 11 3 2B 22.4 34.6 Preparation 12 3 3B 21.7 36.9 Preparation 13 3 2B 22.0 37.0

Referring to Table 3, the heat-shielding paint compositions prepared in Preparation Examples 1 and 2 have excellent water resistance and acid resistance, and exhibit excellent durability even in direct contact with weak acid rainwater, making them suitable for use on exterior walls of building roofs, roofs, etc. It can be seen that the coating film can be maintained for a long time even when an external impact is applied due to excellent adhesion, and it can be confirmed that the heat shielding performance is the best.

Claims (10)

A first polyurethane resin layer containing a carbon fiber composite; and
A second polyurethane resin layer containing a surface-modified heat-shielding pigment on the first polyurethane resin layer;
The carbon fiber composite material is characterized in that it is manufactured by milling 20 to 50% by weight of clay and the remaining amount of carbon fiber,
The first polyurethane resin layer may include a first main agent 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 comprising a first catalyst prepared by mixing,
The second polyurethane resin layer has a viscosity of 1500 to 4500 mPa·s and a second main agent comprising a liquid second diisocyanate-based compound having a density of 1.10 to 1.25 g/cm 3 ; and a second curing agent comprising an acrylic polyol resin, a heat-shielding pigment, and a second dispersant; and the second diisocyanate-based compound has an isocyanate group content of 21 to 24%. film waterproofing material. delete delete The method of claim 1,
The carbon fiber has a cross-sectional diameter of 3 to 10 μm, and a length of 20 to 150 μm, which is an excellent coating film waterproofing material. The method of claim 1,
The clay is a coating film waterproofing material having excellent heat shielding and waterproofing properties including one or two or more selected from montmorillonite, bentonite, nontronite and weidellite. The method of claim 1,
The first subject includes 200 to 350 parts by weight of the 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,
Wherein the first curing agent comprises 5 to 20 parts by weight of the carbon fiber composite material based on 100 parts by weight of the first filler. delete delete The method of claim 1,
The heat-shielding pigment is a coating film waterproofing material having excellent heat-shielding and waterproofing properties that are surface-modified with a vinyl silane-based surface modifier. The method of claim 1,
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 of a heat shielding pigment and 30 to 60 parts by weight based on 100 parts by weight of the acrylic resin. A coating waterproofing material with excellent heat shielding and waterproofing properties containing a weight part of a colored pigment.