KR102046145B1 - heat shield composition for top coating of polyurea waterproof layer - Google Patents

Abstract

The present invention relates to a heat shield paint which is to provide heat shield and thermal insulation performance by being stacked and applied on an upper side of a waterproof layer formed by hardening a membrane waterproof material made of a polyurea resin material in order to improve durability and thermal insulation performance for ultraviolet rays while improving adhesion with a polyurea waterproof layer. The heat shield paint of the present invention comprises: a main agent part including an acrylic base resin, an inorganic pigment including metal oxide for heat shield, a filler including an inorganic compound for heat insulation, an additive, and a first diluent; and a curing agent part including isocyanate and a second diluent. The main agent part and the curing agent part are mixed at a weight ratio of 3 : 0.5 to 1.

Description

Heat shield composition for top coating of polyurea waterproof layer

The present invention relates to a heat shield coating for a polyurea waterproof layer top coat, and more particularly, to a heat shield paint for a polyurea waterproof layer top coat with improved adhesion to the polyurea waterproof layer and improved heat resistance and heat shielding performance.

In general, parts directly or indirectly exposed to moisture such as rainwater such as roofs, outer walls or floors of water treatment facilities and construction structures are waterproofed using a coating waterproof to prevent moisture from penetrating into the structure.

Meanwhile, Patent No. 1998601, filed and registered by the present applicant, discloses a coating film waterproofing material of polyurea resin material having a curing rate controlled to be applied by spraying or rolling even at low temperature and low pressure. At this time, the coating film waterproofing material can be applied finely by using a brush on the bend, step or narrow surface, there is an advantage that the local maintenance is easy. This coating film waterproofing material is cured to form a waterproof coating film layer.

At this time, the heat-resistant coating layer is required as a top coating material for imparting heat shielding and heat insulating performance to the waterproof coating layer so that the waterproof coating layer mainly constructed outdoors is not damaged by sunlight and ultraviolet rays.

On the other hand, conventional heat shield paints are disclosed, such as fluorine-modified acrylic resin, silicone-modified acrylic resin for improving the durability and weather resistance.

However, in the case of fluorine-modified acrylic resin has a disadvantage that is expensive, in the case of silicone-modified acrylic resin is poor pollution resistance performance is not suitable for use for top coat. That is, the surface of the heat shielding layer formed by curing the conventional heat shielding paint is easily contaminated. As a result, the heat shielding performance is deteriorated, so that the waterproof coating layer is damaged by sunlight and ultraviolet rays. In addition, in the case of the fluorine-modified acrylic resin or silicone-modified acrylic resin, the adhesion strength and durability of the waterproofing film layer made of the polyurea resin material were poor, and there was a problem in that the waterproof coating layer was not properly protected.

Korean Patent Registration No. 10-0386007

In order to solve the above problems, the present invention is to provide a heat-resistant coating material for coating a polyurea waterproof layer top coating improved durability and shielding performance against ultraviolet rays while improving the adhesion to the polyurea waterproof layer.

In order to solve the above problems, the present invention is an acrylic base resin in the heat-shielding coating material for top coat to give heat shielding and heat insulation performance by laminating and coating on the upper side of the waterproof layer formed by curing the coating film waterproofing material of polyurea resin material, A main part including an inorganic pigment including a metal oxide for thermal insulation, a filler including an inorganic compound for thermal insulation, an additive, and a first diluent; And a hardener portion including an isocyanate and a second diluent, wherein the main portion and the hardener portion are mixed in a ratio of 3: 0.5 to 1 by weight, and the inorganic pigment is 30 parts of titanium oxide based on the total weight of the inorganic pigment. It includes ~ 40% by weight, heat shield pigment 40-50% by weight, iron oxide 10-30% by weight, the titanium oxide is rutile type of titanium dioxide content of more than 87% by weight relative to the total weight of the titanium oxide , The oil absorption amount is 25ml / 100g or less, the heat shield pigment is provided with titanium dioxide coated with alumina and silica, the iron oxide content of the iron oxide relative to the total weight of the iron oxide is 92% by weight or more, It provides a heat shield paint for coating a polyurea waterproof layer top coating, characterized in that less than 30ml / 100g.

Here, the main part, 20 to 40% by weight of the acrylic base resin, 10 to 15% by weight of the inorganic pigment, 10 to 25% by weight of the filler, and 5 to 15% by weight of the additive based on the total weight of the main part %, And 20 to 40% by weight of the first diluent, wherein the curing agent portion, 20 to 50% by weight of the isocyanate and 50 to 80% by weight of the second diluent, based on the total weight of the curing agent, It is preferred that the first diluent and the second diluent include an ester solvent.

In addition, the filler is one selected from the group consisting of glass bubbles, aluminosilicates and mixtures thereof; And mica, calcium carbonate, graphite and one selected from the group consisting of a mixture thereof is provided and mixed, the additive, 20 to 30% by weight of the antifoaming agent provided with a non-silicone polymer with respect to the total weight of the additive, ester salt It is preferable to include 20 to 30% by weight of the dispersant, 10 to 20% by weight of the viscosity modifier provided with silicon dioxide, and 30 to 40% by weight of the UV stabilizer provided with benzotriazole.

delete

delete

Through the above solution, the thermal insulation paint for coating a polyurea waterproof layer according to the present invention provides the following effects.

First, as the isocyanate contained in the heat-shielding coating as the top coat layer is substantially integrated and firmly attached through the reaction with the aspartic amine contained in the polyurea resin coating waterproofing material, The heat insulation performance can be imparted to the polyurea waterproofing layer so that durability can be significantly improved.

Second, pigments that provide thermal insulation through hiding power and fillers that impart thermal insulation by lowering thermal conductivity are provided with inorganic compounds such as metal oxides, mica, and glass bubbles, and decolorization due to ultraviolet rays due to the inclusion of cycloaliphatic isocyanates as hardeners. In addition, discoloration and deformation are minimized, so that the heat shielding and thermal insulation performance can be maintained for a long time.

Third, as the main portion and the hardener portion are mixed in a ratio of 3: 0.5 to 1 by weight, the physical and chemical properties of the heat shield layer are formed as the equivalent ratio of the hydroxyl portion of the main portion to the isocyanate portion of the hardener is 1 to 1.3. It may be provided with a heat shield coating that can be optimized.

Fourth, as the benzotriazole, an ultraviolet stabilizer, is included as an additive, the thermal barrier paint absorbs not only thermal infrared rays and heat but also ultraviolet rays to stably protect the waterproof layer installed outdoors, thereby preventing damage to the expensive polyurea waterproof layer. Conservativeness and economics can be significantly improved.

Hereinafter, with reference to the accompanying table will be described in detail a heat shield coating for coating a polyurea waterproof layer according to a preferred embodiment of the present invention.

Here, it is preferable that the thermal barrier paint and the thermal barrier paint for coating a polyurea waterproof layer to be described below have the same meaning. Such a heat shielding coating may be used for top coating on a target surface such as a road or an outdoor facility to which a waterproofing layer is applied, and in particular for top coating of a coating waterproofing material disclosed in Korean Patent No. 10-1998601 filed and registered by the present applicant. Can be used. That is, as the thermal barrier paint is laminated and applied to the upper side of the waterproof coating layer formed by curing the coating layer waterproofing material, thermal infrared rays such as sunlight are converted into thermal energy inside the waterproof coating layer or the target surface. It is used to prevent the temperature from rising. Hereinafter, the heat shielding coating will be described as an example of the top coating on the upper surface of the waterproof coating layer.

In detail, the heat shield paint is an acrylic base resin, an inorganic pigment containing a metal oxide, a filler including an inorganic compound, an additive, a main part including a first diluent, and a hardener part including an isocyanate and a second diluent. It is provided as a structured two-part heat shield paint. At this time, the acrylic base resin is preferably provided with an acrylic urethane resin polymerized based on four kinds of acrylic monomers. The main part and the hardener are preferably mixed in a ratio of 3: 0.5 to 1 by weight.

Here, when the hardener portion is less than 0.5 with respect to the main portion 3 in a weight ratio, the foreign matter is adhered in the curing step of the heat shield layer by the viscosity of the uncured portion while the curing reaction is delayed. In addition, the physical properties of the heat shielding layer is lowered, and a defect such as surface expansion or lifting occurs in the curing step does not provide desirable heat shielding performance to the waterproof coating layer.

On the other hand, when the hardener portion is mixed in excess of 1 with respect to the main portion 3 by weight ratio, the mixing amount of the isocyanate in the heat shielding paint is excessively increased. For this reason, while the elongation rate of the said heat shielding layer decreases, hardness becomes high, a crack occurs in the said heat shielding layer, and impact resistance falls. In addition, since the hardness is higher than that of the waterproof coating layer, when an external force is applied, the coating layer is peeled off from the waterproof coating layer.

Therefore, the main part and the hardener part may be mixed in a ratio of 3: 0.5 to 1 by weight, and evenly applied to the upper surface of the waterproof coating layer, the adhesion with the waterproof coating layer may be significantly improved. At this time, when the main portion and the curing agent portion is mixed, since the curing reaction is substantially made within several hours, the main portion and the curing agent portion are each prepared but preferably used in the field mixing. Through this, an equivalent ratio between the hydroxyl group (OH) of the main portion and the isocyanate portion of the curing agent is formed in a ratio of 1: 1 to 1.3 to provide a heat shielding coating having excellent physical properties when cured into a heat shielding layer.

On the other hand, the main part is 20 to 40% by weight of the acrylic base resin, 10 to 15% by weight of the inorganic pigment, 10 to 25% by weight of the filler, 5 to 15% by weight of the additive with respect to the total weight of the main portion , 20 to 40% by weight of the first diluent.

In this case, the acrylic base resin may be a styrene monomer, methyl methacrylate, 2-hydroxyethyl methacrylate, methacrylic acid, and these It is preferably provided with an acrylic urethane resin polymerized with at least one selected from the group consisting of mixtures.

In detail, the acrylic urethane resin may be obtained through the following polymerization process using the four acrylic monomers and the diluent.

First, with respect to the total weight of the acrylic base resin 10 to 25% by weight of the styrene monomer, 15 to 25% by weight of methyl methacrylate, 5 to 14% by weight of the 2-hydroxyethyl metal methacrylate ester, the meta A premix is prepared by mixing 0.5-2.5 wt% of krylic acid and 0.5-2.5 wt% of benzoyl peroxide as a reaction rate regulator. After heating the primary solvent mixed with 10 to 20% by weight of toluene and 10 to 25% by weight of butyl acetate based on the total weight of the acrylic base resin, the temperature is increased to 100 to 120 ° C. The premix is added dropwise to the solvent over 3 hours. After the dropwise addition of the preliminary solution to the primary solvent is completed, the mixture is maintained at 100 to 120 ° C. and refluxed for 2 hours to 5 to 10% by weight of toluene with respect to the total weight of the acrylic base resin. The secondary solvent which mixed 5-10 weight% of butyl acetates is dripped within 30 minutes. Subsequently, after the dropwise addition of the secondary solvent to the primary reaction solution is completed, the reaction is maintained at 100 to 120 ° C. for 2 hours to polymerize the acrylic urethane resin.

Through this, the acrylic urethane resin has a non-volatile content according to KS M ISO 3251 48 to 90% by weight, an acid value of 1 or less, and an OH value of 30 to 50 based on the total weight of the acrylic base resin.

As such, as the acrylic base resin is provided with an acrylic urethane resin, heat resistance, solvent resistance, chemical resistance, and toughness of the heat shield layer may be significantly improved. In addition, since the molecule has an OH group, which is a reactive functional group, adhesion performance may be remarkably improved through crosslinking with the polyurea resin coating waterproofing material applied and registered through the present applicant. Moreover, the coating film waterproofing material is manufactured to be controlled to delay the curing speed than the conventional superfine polyurea resin waterproofing material. Therefore, a synergistic effect may be provided in which durability through waterproofing and heat shielding / insulating performance is remarkably improved in a more firmly attached and fixed state through crosslinking between the coating waterproofing material and the heat shielding paint.

Here, when the acrylic base resin is less than 20% by weight or more than 40% by weight with respect to the total weight of the main part, the adhesion and solubility with other mixtures are lowered. For this reason, the said heat shielding paint is not apply | coated and hardened uniformly on the upper surface of the said waterproof coating film layer, and the heat shielding function as the said heat shielding layer falls. Therefore, the acrylic base resin is preferably included in 20 to 40% by weight based on the total weight of the main portion.

On the other hand, the inorganic pigment contains a metal oxide for heat shielding, it is preferably included in 10 to 15% by weight based on the total weight of the main portion. Herein, the inorganic pigment preferably contains 30 to 40 wt% of titanium oxide, 40 to 50 wt% of heat shield pigment, and 10 to 30 wt% of iron oxide based on the total weight of the inorganic pigment.

In detail, the titanium oxide is preferably provided with titanium dioxide, and the content of titanium dioxide is more than 87% by weight of purity and the oil absorption amount is less than 25ml / 100g according to KS M ISO 591-1. It is preferably provided in a rutile type. The titanium oxide imparts a hiding power to the heat shielding layer to cover and protect the waterproof coating layer from incident light. In addition, when the titanium oxide is provided in a white series, thermal infrared rays such as sunlight may be prevented from entering the waterproof coating layer through the thermal infrared reflection characteristic of the white pigment. have.

At this time, when the titanium oxide is contained in less than 30% by weight relative to the total weight of the inorganic pigment, the hiding power of the heat shielding layer is lowered, the heat shielding performance is lowered. On the other hand, when the titanium oxide is more than 40% by weight relative to the total weight of the inorganic pigment, the color development and hiding power is increased, but the manufacturing cost of the heat shield paint is increased and the economic efficiency is lowered. Therefore, the titanium oxide is preferably included in 30 to 40% by weight based on the total weight of the inorganic pigment.

In addition, the heat shield pigment is preferably provided with titanium dioxide coated with alumina and special silica. Further, the heat shield pigment is more preferably provided with rutile titanium dioxide in which the alumina and the special silica are mixed and surface treated. In this case, the alumina and the special silica mixture may be surface treated to 5 to 10% by weight based on the total weight of the titanium dioxide. Such heat shield pigments have a characteristic of having a low oil absorption because of excellent diffusion reflectance and a small average particle size. Therefore, the main body may be uniformly dispersed and mixed, and the heat shielding layer may have a uniform heat shielding effect.

At this time, when the heat shield pigment is contained in less than 40% by weight relative to the total weight of the inorganic pigment, the heat shielding ability of the heat shield layer is lowered, if it is contained in more than 50% by weight, the heat shielding ability is improved, but the effect is insignificant compared to the cost This lowers the economics. Therefore, the heat shield pigment is preferably contained in 40 to 50% by weight relative to the total weight of the inorganic pigment.

In addition, the iron oxide is preferably provided with iron oxide (iron oxide), the content of the iron oxide with respect to the total weight is more than 92% by weight of purity, the oil absorption is preferably provided that the 30ml / 100g. Such iron oxides are included to impart differential visibility to the thermal barrier paint. In this case, when the iron oxide is contained in less than 10% by weight relative to the total weight of the inorganic pigment, the coloring power of the heat shielding paint is lowered visibility is lowered, if it exceeds 30% by weight can not fall within the range of the desired coloring power. Therefore, the iron oxide is preferably contained in 10 to 30% by weight based on the total weight of the inorganic pigment.

As such, since the inorganic pigment including the iron oxide and the titanium oxide is included as the pigment for the color development and heat shielding in the main part, discoloration and deformation due to ultraviolet rays are minimized, and thus the heat shielding performance of the heat shielding layer can be maintained for a long time. have. In addition, the homogeneity may be improved as compared with the organic pigment which may cause aggregation and poor dispersion when mixing with the acrylic base resin.

In this case, when the inorganic pigment is contained in less than 10% by weight relative to the total weight of the main body, hiding power, heat shielding performance and color development power is lowered, if it exceeds 15% by weight, hiding power, heat shielding performance and color development power is improved but manufacturing cost As it increases, economics fall. Therefore, the inorganic pigment is preferably included in 10 to 15% by weight relative to the total weight of the main portion. Through this, and when the heat shielding coating is applied to a thickness of 50 ~ 100㎛ the near infrared reflectance measured according to KS M 5987 can be formed to more than 85%.

On the other hand, the filler includes an inorganic compound for thermal insulation, it is preferably included in 10 to 25% by weight relative to the total weight of the main portion. Such fillers are selected from the group consisting of glass bubbles, aluminosilicates and mixtures thereof; And mica, calcium carbonate, graphite, and mixtures thereof. That is, the filler preferably includes at least one of the glass bubble and the aluminosilicate.

In addition, the filler is more preferably one selected from the group consisting of the glass bubble, the aluminosilicate, and mixtures thereof, 50 to 55% by weight relative to the total weight of the filler. In detail, when one selected from the group consisting of the glass bubble, the aluminosilicate, and mixtures thereof is included in less than 50% by weight based on the total weight of the filler, thermal insulation performance through thermal insulation is reduced. On the other hand, when the one selected from the group consisting of the glass bubble, the aluminosilicate, and mixtures thereof exceeds 55% by weight based on the total weight of the filler, the thermal insulation performance is increased but the oil absorption is high, so the viscosity is increased. For this reason, workability | operativity falls at the time of apply | coating the said heat shielding paint to the upper surface of the said waterproof coating film layer. Therefore, it is preferable that one selected from the group consisting of the glass bubble, the aluminosilicate, and mixtures thereof is included in an amount of 50 to 55 wt% based on the total weight of the filler.

In this case, the filler may be dispersed in the heat shielding layer to form a heat insulating layer to reduce heat conductivity to prevent heat from being transferred to the waterproof coating layer. That is, the heat shield is shielded while the incident light is reflected through the inorganic pigment and heat is insulated through the filler. Through this, thermal infrared rays such as sunlight may be transferred to the waterproof coating layer to suppress the conversion into thermal energy.

Moreover, it is more preferable that the filler is included in a larger weight percent than the inorganic pigment. Therefore, while maintaining the heat shielding and thermal insulation effect through the heat shielding paint, the reflectance of incident light can be adjusted. Through this, it is also possible to mitigate excessive transmission of radiant heat to the upper side of the target surface on which the waterproof coating layer and the heat shielding layer are constructed.

On the other hand, the additive is preferably 20 to 30% by weight of the antifoaming agent, 20 to 30% by weight of the dispersant, 10 to 20% by weight of the viscosity regulator, and 30 to 40% by weight of the UV stabilizer. In addition, for the reactivity of the main part, the additive is preferably included in 5 to 15% by weight based on the total weight of the main part.

In detail, the antifoaming agent is included to stabilize the bubbles generated during the reaction of the main portion and the curing agent portion to prevent the generation of pores in the interior or surface of the heat shield layer. In this case, the antifoaming agent is provided with a non-silicone-based polymer, for example, a non-silicone-based polymer antifoaming agent such as BYK-051N or BYK-052N of BYK company may be used.

In this case, when the antifoaming agent is included in less than 20% by weight relative to the total weight of the additive, bubbles generated during the mixing of the main part and the curing agent and the upper surface of the waterproof coating layer is also coated on the bubbles generated during the curing reaction Defoaming performance is reduced. On the other hand, if the antifoaming agent exceeds 30% by weight based on the total weight of the additive, the defoaming performance may be slightly improved, but the viscosity is lowered, the adhesion between the coating layer is lowered when repainting, and the physical properties of the heat shielding layer are lowered. do. Therefore, the antifoaming agent is preferably included in 20 to 30% by weight based on the total weight of the additive.

In addition, the dispersant is included to prevent aggregation between the respective components included in the main portion, and in particular so that the inorganic pigment and the filler can be uniformly dispersed. At this time, the dispersant is preferably provided with a phosphate ester salt.

Here, when the dispersant is included in less than 20% by weight based on the total weight of the additive, the softening performance is lowered, so that the inorganic pigment and the filler may not be uniformly dispersed in the heat shielding paint. On the other hand, when the dispersant exceeds 30% by weight with respect to the total weight of the additive, a caking phenomenon occurs in which the viscosity of the thermal barrier paint is lowered and the redispersibility due to sedimentation of the inorganic pigment and the filler is reduced. Therefore, the dispersant is preferably included in 20 to 30% by weight based on the total weight of the additive.

On the other hand, the viscosity modifier is included to adjust the viscosity so that the heat shielding coating is applied in a uniform thickness, it is preferably provided with silicon dioxide (silicon dioxide). Here, when the viscosity modifier is included in less than 10% by weight relative to the total weight of the additive, the segging performance is lowered, the paint is excessively diluted and flowing down occurs. On the other hand, when the viscosity modifier exceeds 20% by weight based on the total weight of the additive, the viscosity is excessively increased, making it difficult to apply a uniform thickness. Further, since the wettability is sharply lowered when the silicon dioxide exceeds a predetermined weight% range, the viscosity modifier is preferably included in an amount of 10 to 20 wt% based on the total weight of the additive.

In addition, the UV stabilizer is provided with benzotriazole, and absorbs ultraviolet rays to maintain the thermal insulation performance of the heat shield layer and prevent the waterproof coating layer from being deformed by ultraviolet rays.

In detail, the ultraviolet stabilizer is 2- (3,5-di-ty-amyl-2-hydroxy-phenyl) benzotriazole (2- (3,5-di-t-amil-2-hydroxy-phenyl) benzotriazole It is preferred to be provided with). For example, TINUVIN 328 by BASF, whose melting point of the pale yellow crystalline powder is 80 ° C. or more and the maximum ultraviolet absorption wavelength is 340 nm or more, may be used as the UV stabilizer.

In this case, when the UV stabilizer is included in less than 30% by weight relative to the total weight of the additive, it does not absorb ultraviolet rays stably, and when the UV stabilizer exceeds 40% by weight, the UV absorbing ability is increased but the effect is insignificant compared to the cost, and economic efficiency is lowered. . Therefore, the UV stabilizer is preferably included in 30 to 40% by weight based on the total weight of the additive.

On the other hand, the first diluent is preferably included in 20 to 40% by weight based on the total weight of the main portion. At this time, it is preferable that the first diluent contains an ester solvent.

In detail, the first diluent is the ester solvent; And it is preferably included one selected from the group consisting of an ether solvent, a hydrocarbon solvent, a plasticizer and mixtures thereof. Further, the first diluent is more preferably 40 to 50% by weight of the ester solvent based on the total weight of the first diluent. Such ester solvents are preferably provided with a number average molecular weight of 100 and a boiling point of 100 ° C. or more, and are included to improve the coating workability by adjusting the fluidity and viscosity of the heat shielding paint.

Here, as the ester solvent, methyl lactate, ethyl lactate, butyl lactate, methyl 2-hydroxyisobutyrate, ethyl acetate, n-butyl acetate, isobutyl acetate, pentyl formate, isopentyl acetate, butyl propionate, isopropyl butyrate, Ethyl butyrate, butyl butyrate, methyl pyruvate, ethyl pyruvate, propyl pyruvate, methyl acetoacetate, ethyl acetoacetate, cyclohexanol acetate, γ-butyrolactone, propylene glycol diacetate, 1,3-butylene glycol diacetate and these It can be used as one of the group consisting of a mixture of.

As the ether solvent, ethylene glycol monoalkyl ethers, diethylene glycol monoalkyl ethers, propylene glycol monoalkyl ethers, dipropylene glycol dialkyl ethers, phenol ethers, and mixtures thereof may be used. Can be.

In addition, as the hydrocarbon solvent, toluene, xylene, p-xylene, m-xylene, mesitylene, solvent naphtha H, solvent naphtha A, pentane, hexane, isohexane, heptane, nonane, octane, dodecane, 2-methyl Alkanes such as butane, hexadecane, tridecane, pentadecane, cyclopentane, 2,2,4-trimethylpentane, petroleum ether, chlor hydrocarbon, fluorohydrocarbon, halogen hydrocarbon such as nitro hydrocarbon, benzene, 1 , 2-dimethylbenzene, 1,2,4-trimethylbenzene, mineral spirit, kerosine, isobutylbenzene, methylnaphthalene, ethyltoluene, ligroin, and mixtures thereof.

In this case, the first diluent is preferably included to fill the remainder of the weight percent set so that the acrylic base resin, the inorganic pigment, the filler and the additive can exhibit the desired physical and chemical properties of the thermal barrier paint. In this case, when the first diluent exceeds 40% by weight relative to the total weight of the main part, the physical properties of the heat shielding coating are lowered, so it is more preferably included in 20 to 40% by weight.

On the other hand, the curing agent portion is provided including 20 to 50% by weight of isocyanate and 50 to 80% by weight of the second diluent with respect to the total weight of the curing agent.

Here, it is preferable that the isocyanate is selected from alicyclic isocyanates resistant to ultraviolet rays than aromatic isocyanates which are susceptible to ultraviolet rays and yellowing occurs.

In detail, the isocyanate is selected from the group consisting of hexamethylene diisocyanate trimer (HDI trimer); And hexamethylene diisocyanate (HDI), isophorone diisocyanate (IPDI), dicyclohexylmethan diisocyanate (H12MDI), and mixtures thereof. desirable. Furthermore, as the isocyanate, the HDI trimer is 99 to 100% by weight solids, and the NCO content is included as 20 to 22, thereby significantly improving tensile strength, accelerated weather resistance and durability in physical properties of the dried and cured heat shield layer. You can.

In addition, the second diluent is preferably provided with an ester solvent similarly to the first diluent, and is preferably included in an amount of 50 to 80 wt% based on the total weight of the curing agent. Through this, the main part and the hardener part including the same diluent can be uniformly mixed, and the heat shielding performance, heat insulation performance, color development and ultraviolet stability through the hiding power to the heat shield layer formed by applying and curing the heat shielding paint Can be exerted uniformly.

In addition, adhesion strength may be remarkably improved through a reaction between aspartic amine in the coating waterproof material of polyurea resin and isocyanate in the heat shielding paint. Moreover, the heat shielding coating may be further improved in adhesion strength between the waterproofing coating layer and the heat shielding layer as it is applied before the coating film waterproofing material is completely cured.

Subject Example 1 Example 2 Example 3 Example 4 Acrylic Base Resin 20 30 30 40 Inorganic pigments 15 10 15 10 Filler 25 25 25 20 additive 10 10 10 10 1st diluent 30 25 20 20 Total (% by weight) 100 100 100 100

Curing agent part Example 1 Example 2 Example 3 Example 4 Isocyanate 60 60 60 60 2nd diluent 40 40 40 40 Total (% by weight) 100 100 100 100

Thermal insulation performance (℃) Example 1 Example 2 Example 3 Example 4 Specimen Surface Temperature 56.2 55.4 54.2 56.4 Internal temperature 35.2 33.5 31.1 38.2 Temperature difference 21 21.9 23.1 18.2

On the other hand, Table 1 is a table showing the composition ratio of the main portion according to each embodiment, Table 2 is a table showing the composition ratio of the curing agent portion according to each embodiment. In addition, Table 3 is a table showing the results of measuring the heat shielding performance of the heat shield coating formed on each specimen after mixing the main portion and the curing agent portion of each of the embodiments prepared according to Table 1 and Table 2, and then applied to the specimen. At this time, each specimen is prepared as follows.

First, the thermal insulation paint prepared according to each embodiment is applied to each specimen coated with the polyurea coating waterproofing material so as to have a thickness of 50 to 100 μm. At this time, the main portion and the curing agent portion of each embodiment is mixed in a weight ratio of the main portion: the hardener portion in a 3: 1 ratio in consideration of the equivalent ratio is coated. Each of the specimens coated with the thermal barrier paint was aged at room temperature for 7 days, and then irradiated with a heat source (infrared ray irradiator, Philips 250W, E27-230V, 0.1-1.4 nm per infrared wave) in a closed space for 30 minutes. The surface and internal temperatures of the specimens were measured. Here, the internal temperature was measured by a glass bar thermometer fixed inside each specimen, the surface temperature was measured by a non-contact thermometer (SA-8 SK-8700). At this time, each specimen is prepared as three per each embodiment, it is preferable to understand that the average value of the specimen is shown in Table 3 above.

As shown in Tables 1 to 3, it can be confirmed that the heat shielding performance in Example 3, wherein the mixing ratio of the acrylic base resin, the inorganic pigment and the filler is large.

Test Items result Rule Coating properties No lumps, condensation, or film KS M ISO 1513 Inspect the appearance of the dry film No flow, no crack, no wrinkle M 5000-2421 Nonvolatile matter (% by weight) 45 ± 3 KS M ISO 3251 Drying time (h) 8 KS M 5000-2512 VOC _S Content (g / L) 410 KS M 11890-1 Weathering resistance No cracking, peeling, swelling, choking
Fading, discoloration is good KS M 5000 Gloss retention
(After 1,200h accelerated weather resistance) 80% or more KS M 2813 Near-infrared reflection retention
(After 1,200h accelerated weather resistance) 80% or more KS M 5987 Impact resistance No cracking, flaking KS M ISO 6272-1 Chemical resistance Good KS M ISO 2821-1 Moisture resistance Good KS M ISO 6270-1 Adhesion Strength (MPa) 2.4 KS F 4919

Table 4 is an evaluation table that tested the performance of the heat shield paint prepared according to Example 3. At this time, each performance of the thermal barrier paint was measured according to the regulations shown in Table 4 above. Here, the adhesive strength of the thermal insulation paint is applied to the concrete plate having a width × length × height of 70 × 70 × 20 (mm), respectively, and then coated with a polyurea coating waterproofing material and left for one hour to apply the thermal insulation paint of Example 3 and the 25 ℃ of Evaluation was performed after 7 days of prevention at room temperature. At this time, the number of specimens used for the evaluation of the adhesion strength was set to three, and as a result of the test, all of the concrete substrates were destroyed at a force of 2.4 MPa or more, and peeling between the polyurea waterproofing material and the heat shielding paint did not occur.

Thus, it can be seen that the heat shield according to the present invention can stably protect the polyurea waterproof layer from ultraviolet rays with heat shielding and thermal insulation performance when used for the top coat of the polyurea waterproof layer.

That is, as the isocyanate contained in the heat-shielding coating as the top coat layer is substantially integrated and firmly attached through the reaction with the aspartic amine included in the coating film waterproofing material made of polyurea resin, heat shielding against thermal infrared rays such as solar light and The heat insulation performance can be imparted to the polyurea waterproofing layer so that durability can be significantly improved.

In addition, pigments that provide heat shielding performance through hiding power and fillers that impart thermal insulation by lowering thermal conductivity are provided with inorganic compounds such as metal oxides, mica and glass bubbles, and decolorization due to ultraviolet rays as alicyclic isocyanates are included as a curing agent. As a result, discoloration and deformation are minimized, and heat shielding and thermal insulation performance can be maintained for a long time.

Furthermore, the physical portion and the chemical properties of the heat shield layer are formed by mixing the main portion and the hardener portion in a weight ratio of 3: 0.5 to 1 with an equivalent ratio of the hydroxyl portion of the main portion to the isocyanate portion of the hardener portion of 1 to 1.3. It may be provided with a heat shield coating that can be optimized.

In addition, as the benzotriazole, an ultraviolet stabilizer, is included as an additive, the heat shielding paint absorbs not only thermal infrared rays and heat but also ultraviolet rays to stably protect the waterproof layer installed outdoors, thereby preventing damage to the expensive polyurea waterproof layer. Conservativeness and economics can be significantly improved.

In this case, the terms "comprise", "comprise", "comprise" or "have" described above mean that the corresponding component may be included unless otherwise stated, and thus, other It should be construed that it is possible to include other components rather than to exclude the components. All terms, including technical and scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art unless otherwise defined. Terms commonly used, such as terms defined in a dictionary, should be interpreted to coincide with the contextual meaning of the related art, and shall not be interpreted in an ideal or excessively formal sense unless explicitly defined in the present invention.

As described above, the present invention is not limited to the above-described embodiments, but may be modified and implemented by those skilled in the art without departing from the scope of the claims of the present invention. Such variations are within the scope of the present invention.

Claims (5)

In the heat shield coating for top coat for laminating and coating on the upper side of the waterproof layer formed by curing the polyurea resin material waterproofing material,
A main part comprising an acrylic base resin, an inorganic pigment containing a metal oxide for thermal insulation, a filler including an inorganic compound for thermal insulation, an additive, and a first diluent; And
A hardener portion comprising an isocyanate and a second diluent,
The main part and the hardener are mixed in a ratio of 3: 0.5 to 1 by weight,
The inorganic pigments may include 30 to 40% by weight of titanium oxide, 40 to 50% by weight of heat shield pigment, and 10 to 30% by weight of iron oxide, based on the total weight of the inorganic pigment,
The titanium oxide is rutile type, the content of titanium dioxide is more than 87% by weight, the oil absorption amount is 25ml / 100g or less with respect to the total weight of the titanium oxide,
The heat shield pigment is provided with titanium dioxide coated with alumina and silica,
The iron oxide has a content of iron oxide of 92% by weight or more based on the total weight of the iron oxide, the oil-absorbing coating material for a polyurea waterproof layer top coating, characterized in that the oil absorption amount is 30ml / 100g or less. The method of claim 1,
The main body, with respect to the total weight of the main body,
20 to 40 wt% of the acrylic base resin, 10 to 15 wt% of the inorganic pigment, 10 to 25 wt% of the filler, 5 to 15 wt% of the additive, and 20 to 40 wt% of the first diluent ,
The hardener portion is based on the total weight of the hardener portion,
20 to 50% by weight of the isocyanate and 50 to 80% by weight of the second diluent,
The first diluent and the second diluent are polyurea waterproof layer top coating for heat-resistant coating, characterized in that it comprises an ester solvent. delete The method of claim 1,
The filler is one selected from the group consisting of glass bubbles, aluminosilicates and mixtures thereof; And one selected from the group consisting of mica, calcium carbonate, graphite, and mixtures thereof,
The additive is based on the total weight of the additive,
20 to 30% by weight of antifoaming agent with non-silicone polymer, 20 to 30% by weight of dispersant with ester salt, 10 to 20% by weight of viscosity modifier with silicon dioxide, and UV stabilizer 30 ~ with benzotriazole Thermal insulation paint for coating a polyurea waterproof layer, characterized in that containing 40% by weight. delete