KR102207388B1 - Method for forming a heat-shielding and water-resistant coating with two layers structure using 2-coat-type aqueous heat-shielding and water-resistant paint for rooftop or roof - Google Patents

Abstract

In the present invention, water-based heat-shielding paints and hollow pigments, white pigments, extender pigments, elastic binder resins, diluents, and other additives are dissolved in water by dissolving or dispersing heat-shielding pigments, white pigments, acrylic binder resins, diluents and other additives in water. Or it provides a two-coat type water-based heat-shielding waterproofing paint for roof or roof made of dispersed water-based insulating paint, a two-layered heat-shielding waterproofing coating method using the same, and a heat-shielding waterproofing film of a two-layer structure according to the method.
The two-coat type water-based heat-shielding waterproof coating for roof or roof according to the present invention is eco-friendly and excellent in workability, and the heat-shielding waterproof coating having a two-layer structure manufactured therefrom is an environment directly exposed to sunlight and climate change. Also, it can exhibit excellent heat shielding properties and heat insulating properties without deteriorating physical properties and durability.

Description

METHOD FOR FORMING A HEAT-SHIELDING AND WATER-RESISTANT COATING WITH TWO LAYERS STRUCTURE USING 2-COAT-TYPE AQUEOUS HEAT- SHIELDING AND WATER-RESISTANT PAINT FOR ROOFTOP OR ROOF}

The present invention is a two-coat type water-based heat-shielding waterproofing paint that can be used for heat shielding and insulation of radiant heat caused by sunlight on a roof or roof, a heat shielding waterproofing coating method of a two-layer structure using the same, and a difference in a two-layer structure accordingly It relates to a heat-resistant waterproof coating film, and more specifically, a heat-shielding pigment, white pigment, acrylic binder resin, diluent and other additives dissolved or dispersed in water for top coat water-based heat-shielding paint and hollow pigment, white pigment, extender pigment, elasticity A two-coat type water-based heat-shielding waterproofing paint consisting of a water-based insulating paint for undercoat in which a binder resin, a diluent and other additives are dissolved or dispersed in water, a two-layered heat-shielding waterproofing coating method using the waterproofing paint, and the difference therebetween It relates to a heat shielding waterproof coating film having a two-layer structure of a heat layer and a heat insulating layer.

It is the roof surface temperature that actually increases the internal temperature of the building in summer rather than the external temperature. Generally used for roofs and exterior walls of buildings, the so-called "insulation material" refers to a material with a certain thickness as low heat conductivity and suppresses the transfer of heat from outside to the inside, typically glass fiber, polystyrene foam And polyurethane foam.

On the other hand, the heat shielding paint has a film thickness of 100 to 200 µm, effectively reflecting infrared rays in sunlight and lowering the temperature of the roof surface, thereby reducing the heat flowing into the building and suppressing the increase in indoor temperature.

When the metal surface is coated with the heat shielding paint, the heat shielding effect is particularly high, because the long-wave emissivity of the metal is low. Here, the long-wave emissivity is a value representing the degree of heat transfer between a solid such as a roofing material and the air, and the long-wave emissivity of the heat shielding paint is very high, and since a large amount of heat is radiated into the atmosphere from the heated roofing material, the temperature of the roofing material Decreases the heat entering the room.

The most closely related to the heat shielding property of the heat shielding paint is the solar reflectance.Since the solar reflectance of the heat shielding paint is very high, in the case of a building painted with the heat shielding paint, the heat entering the room is greatly reduced and the indoor temperature is reduced. maintain. In particular, if heat shielding paint is applied on a roof without insulation, a significant energy saving effect can be expected.

For the same reason, it is called a heat shielding paint differently from an insulating paint, and this is not to be confused with a so-called heat insulating paint that uses a low thermal conductivity.

On the other hand, a surface coating composition having a property of cooling solar radiation has been disclosed (International Publication No. WO 02/098996), and the surface coating composition contains a solar reflective paint, so the solar absorption rate is low, especially It exhibits excellent heat dissipation characteristics at a wavelength corresponding to the infrared region. In particular, the surface coating composition contains a solar reflective paint using a shell-shaped microsphere, but shows a high reflectance only in the infrared region of sunlight, resulting in poor overall heat blocking effect. There is this.

In addition, there are reports of coating compositions that reduce the temperature of surfaces exposed to radiant energy (US Patent Publication No. 2005/0288394). Here, the coating composition is described as exhibiting heat dissipation, insulation, reflective properties and heat absorbing properties, and is mainly disclosed for a coating composition having a function of suppressing conversion from solar energy to thermal energy.

Up to now, a top coat composition that forms a coating film having excellent stain resistance, flexibility, acid resistance, and gloss (Japanese Patent Laid-Open Nos. 96-102287 and 96-102287), excellent solar heat reflection effect and heat insulation, and against external contamination. Non-polluting solar-blocking thermal insulation coating composition (Korean Patent Laid-Open No. 1020010088084) and spray light reflective coating composition (Korean Patent Laid-Open No. 1020020071976), which have excellent protection properties. There have been various attempts on this, but the coating compositions simply inhibit the transfer of heat, but do not prevent the transfer of heat itself.

The following Patent Document 1 relates to a top coat composition for a waterproofing material having heat shielding ability and a coating method using the same, and more specifically, 35 to 45 parts by weight of acrylic resin, 0.1 to 1 part by weight of dispersant, 35 to 45 parts by weight of heat shielding pigment, sedimentation A main part containing 0.1 to 1 part by weight of an inhibitor, 0.1 to 1 part by weight of a catalyst, and 5 to 15 parts by weight of a polyester resin; And a curing agent part containing 40 to 50 parts by weight of a polyisocyanate, 0.1 to 1 parts by weight of a water absorbent, and 50 to 60 parts by weight of a diluent. It discloses a topcoat composition for a waterproofing material having a heat shielding ability of a two component type and a coating method using the same. The top coat composition according to the document is applied as a top coat to a waterproofing material containing polyurethane resin as a main component, thereby protecting the medium from ultraviolet rays to exhibit physical properties such as durability, flexibility and impact resistance, as well as effectively reflecting infrared rays among sunlight to rooftop. By lowering the temperature of the surface to reduce heat flowing into the building, it exhibits a heat shielding performance that suppresses an increase in the indoor temperature, thereby reducing the indoor cooling energy of the building. However, the top coat composition according to the document is an oil paint composition using an organic solvent, and thus has disadvantages in terms of work and environment.

The following Patent Document 2 discloses applying a water-soluble heat shielding paint composition including a heat shielding pigment and a hollow pigment in an acrylic emulsion resin to an inorganic floor surface such as asphalt or concrete. In the above document, by using a water-soluble acrylic emulsion resin composed of a special monomer and containing a color coating agent of various colors, the surrounding beauty is beautiful, volatile organic compounds (VOC) are minimized, odor is small, drying is fast, hiding power, water resistance, and resistance It is excellent in pollution, abrasion resistance, durability, water resistance, alkali resistance, weather resistance, anti-skid function, and effective reflection of infrared rays among sunlight to suppress the rise of road surface temperature, thereby exhibiting heat shielding performance that can suppress the heat island phenomenon in the city. It is disclosed that it is suitable for use on dedicated roads.

The following Patent Document 3 is (i) at least one elastic copolymer having a measured glass transition temperature (measured tg) of -100 to 0 and at least one mesoporous filler, preferably a meno substantially free of organic groups or residues. Although an aqueous or solvent-containing composition for use as an elastic roof coating agent having excellent infrared (ir) reflectance including a poros filler is disclosed, there is no mention of heat shielding properties or the use of heat shielding pigments.

Therefore, in order to solve the above problems in the art, there is an urgent need to develop a water-based coating composition that exhibits excellent heat shielding effect as well as physical properties as a conventional coating composition.

Registered Patent Publication No. 10-0662602 (Registration date 2006.12.21.) Unexamined Patent Publication No. 10-2011-0072514 (published on 2011.06.29.) Unexamined Patent Publication No. 10-2016-0007365 (published on January 20, 2016)

The inventors of the present invention have been applied to paints and coating methods that are installed on a roof or roof, have excellent thermal properties such as heat shielding properties and thermal insulation properties, and can install an eco-friendly water-based heat shielding waterproof coating film even in an environment exposed to direct sunlight and harsh outside air. I have been studying politely.

The present inventors, on a roof or roof directly exposed to sunlight and climate change, 0.1 to 2% by weight of a hollow pigment, 1 to 5% by weight of a white pigment, 20 to 40% by weight of an extender pigment, 40 to 60% by weight of an elastic binder resin, Insulating waterproof layer and heat shielding pigment 0.1 to 2% by weight, white pigment 20 to 40% by weight, acrylic binder resin 40 to using a water-based paint for intermediate use containing 1 to 5% by weight of diluent, 5 to 15% by weight of additives and residual water It is a two-layer structure composed of a heat shielding layer using water-based paint for top coats containing 60% by weight, diluent 1 to 5% by weight, additives 5 to 15% by weight, and residual water. By installing after the primer treatment, it was found that the above-described problem could be solved, and the present invention was completed.

The two-coat type water-based heat-shielding waterproof coating for roof or roof according to the present invention is eco-friendly and excellent in workability, and the heat-shielding waterproof coating having a two-layer structure manufactured therefrom is an environment directly exposed to sunlight and climate change. Also, it can exhibit excellent heat shielding properties and heat insulating properties without deteriorating physical properties and durability.

1 is a graph showing changes in internal temperature over time under light irradiation after coating the water-based paint for top coats and the water-based paint for intermediate coats of Example 1, Reference Example 1, and Comparative Example 1 according to the present invention.
2 is a graph showing changes in external temperature over time under light irradiation after coating the water-based paints for top coats and the water-based paints for intermediate coats of Example 1, Reference Example 1 and Comparative Example 1 according to the present invention.

The first object of the present invention is to provide a two-coat type water-based heat-shielding waterproof paint for a roof or roof, consisting of a water-based heat-insulating paint for a top coat and a water-based heat-insulating paint for a bottom coat,

The above-described water-based heat-shielding paint for top coat includes 0.1 to 2% by weight of a heat shielding pigment, 10 to 30% by weight of a white pigment, 40 to 60% by weight of an acrylic binder resin, 1 to 5% by weight of a diluent, 5 to 15% by weight of an additive, and a residual amount of water. Contains, and

The aforementioned water-based insulating paint for undercoat is 0.1 to 2% by weight of a hollow pigment, 1 to 5% by weight of a white pigment, 20 to 40% by weight of an extender pigment, 40 to 60% by weight of an elastic binder resin, 1 to 5% by weight of a diluent, and an additive. It may contain 5 to 15% by weight and the remaining amount of water.

According to one embodiment of the present invention, the acrylic binder resin of the aqueous heat shielding paint described above may be selected from acrylic emulsion resins having a glass transition temperature of 0°C or higher, preferably 10°C or higher, and more preferably 20°C or higher. have. Alternatively, the acrylic emulsion resin of the above-described water-based heat shielding paint may have an internally crosslinked core-shell structure having a core glass transition temperature of 30°C or higher, preferably 40°C or higher, and more preferably 50°C or higher. .

According to another embodiment of the present invention, the above-described heat shielding pigment is selected from aluminum metal powder, and the above-described hollow pigment may be selected from the group consisting of porous silica, porous titania, hollow silica and hollow titania.

According to one variant of the present invention, the aforementioned water-based insulating paint may further include a silane-based or epoxy-based crosslinking agent.

According to one preferred embodiment of the present invention, the aforementioned water-based insulating paint,

(1a) An elastic binder resin (eg acrylic emulsion resin) and additives (eg thickener, emulsifier, antifoam) were added to water, and stirred for 30 minutes,

(1b) To the obtained formulation, a hollow pigment, a white pigment and an extender pigment were added and stirred at 1,000 to 1500 rpm for 1 hour,

(1c) Prepared by adding additional elastic binder resin (e.g. acrylic emulsion resin), additives (e.g. diluent, antifoaming agent, thickener) and residual amount of water to the obtained blend and stirring at 1,000 to 1,500 rpm for 1 hour. Can be.

According to one preferred embodiment of the present invention, the aforementioned water-based heat shielding paint,

(2a) Add additives (e.g. thickener, dispersant, emulsifier, antifoam, etc.) to water, and stir at 1,000-1,500 rpm for 30 minutes,

(2b) To the obtained formulation, a heat shielding pigment and a white pigment were added, and the pigment was stirred at 1,000 to 1,500 rpm for 1 hour and 30 minutes so that the average particle diameter of the pigment became 20 μm or less,

(2c) It may be prepared by adding a binder resin (e.g. acrylic emulsion resin) and additives (e.g. anti-settling agent, diluent, antifoaming agent, thickener) to the obtained formulation and stirring at 1,000 to 1,500 rpm for 1 hour and 30 minutes. have.

A second object of the present invention is to provide a heat-shielding waterproof coating method for forming a two-layered heat-shielding waterproof coating on a roof or roof by using the above-described water-based heat-shielding paint and water-based heat-insulating paint. Includes:

(1) A roof or roof base layer is prepared, and in some cases, the above-described roof or roof base layer is optionally subjected to a primer treatment or a waterproof coating,

(2) The base layer of the roof or roof, for example, 0.1 to 2% by weight of hollow pigment, 1 to 5% by weight of white pigment, 20 to 40% by weight of extender, 40 to 60% by weight of elastic binder resin, diluent 1 Applying and drying a water-based insulating paint for a top coat containing -5% by weight, 5 to 15% by weight of an additive, and a residual amount of water, thereby forming an insulating waterproof intermediate, and then

(3) In the heat insulating layer, for example, 0.1 to 2% by weight of a heat shielding pigment, 10 to 30% by weight of a white pigment, 40 to 60% by weight of a binder resin, 1 to 5% by weight of a diluent, 5 to 15% by weight of an additive, and the remaining amount Applying and drying a water-based heat-shielding paint for a top coat containing water of, thereby forming a heat-shielding top coat,

(4) In some cases, a transparent UV protective layer is further included.

A third object of the present invention is a method of forming a two-layered heat-shielding waterproof coating film formed using the above-described water-based heat-shielding paint and the water-based insulating paint, or a two-layered heat-shielding waterproofing film on the roof or roof, or It is to provide a heat-shielding waterproof coating film having a two-layer structure formed by a heat-shielding waterproof coating method.

Hereinafter, the present invention will be described in more detail.

In the present specification, heat shielding or heat shielding means preventing a temperature rise by reflecting or blocking visible and infrared rays of sunlight, and adiabatic or heat insulating means preventing a decrease or rise in temperature by inhibiting or inhibiting the conduction of heat. do.

A. Water-based heat shielding paint and heat shielding layer

In the present invention, the water-based heat shielding paint may include a heat shielding pigment, a white pigment, an acrylic binder resin, a diluent, and other additives dissolved or dispersed in water. For example, the aforementioned water-based heat-shielding paint includes 0.1 to 2% by weight of a heat shielding pigment, 20 to 40% by weight of a white pigment, 40 to 60% by weight of an acrylic binder resin, 1 to 5% by weight of a diluent, 5 to 15% by weight of an additive, and the remaining amount. May contain water.

The aforementioned water-based heat shielding paint can be prepared in a method comprising the following steps:

(1a) Additives (thickeners, dispersants, emulsifiers, antifoaming agents, etc.) are added to water and stirred at 1,000-1,500 rpm for 30 minutes,

(1b) To the obtained formulation, a heat shielding pigment and a white pigment were added, and the mixture was stirred at 1,000 to 1500 rpm for 1 hour and 30 minutes so that the average particle diameter of the pigment became 20 μm or less,

(1c) To the obtained formulation, an acrylic emulsion resin and additives (anti-settling agent, diluent, antifoaming agent, thickener, etc.) were added as a binder, followed by stirring at 1,000-1,500 rpm for 1 hour and 30 minutes.

(A-1) Acrylic binder resin

In the water-based heat shielding paint according to the present invention, the acrylic binder resin described above may be selected from acrylic emulsion resins having a glass transition temperature of 10°C or higher, preferably 20°C or higher, and more preferably 30°C or higher, and preferably May be selected from acrylic emulsion resins having an internal crosslinked core-shell structure in which the core has a glass transition temperature of 30°C or higher, preferably 40°C or higher, and more preferably 50°C or higher.

As the acrylic emulsion resin that can be used in the present invention, as non-limiting examples, methyl methacrylate, methacrylic acid, butyl methacrylate, hydroxypropyl methacrylate, ethylene glycol dimethacrylate, butylene glycol tree Methacrylate, polyethylene glycol trimethacrylate, pentaacryldiol trimethacrylate, alkyl methacrylate, cycloalkyl methacrylate, ethyl methacrylate, isobutyl methacrylate, t-butyl methacrylate, triethyl Propane tri methacrylate, trimethylolpropane tri methacrylate, 2-hydroxyethyl methacrylate, 2-hydroxypropyl methacrylate, 4-hydroxybutyl acrylate, 2-hydroxyethyl acrylate, 2- At least one may be selected from the group of copolymers of acrylic monomers such as hydroxypropyl acrylate and 4-hydroxybutyl methacrylate.

If the glass transition temperature (Tg) of the above-described acrylic emulsion resin is too low, the hardness and adhesion of the coating film, contamination, adhesion, abrasion resistance, and drying time decrease, and if the glass transition temperature (Tg) is too high, the hardness and crack of the coating film , Since flexibility (stretchability) is inferior, it is preferable to use a resin having a glass transition temperature (Tg) of 10 to 50°C and excellent in weather resistance, stain resistance, and water resistance. By using an acrylic emulsion resin within the above range, Hardness and durability, adhesion, and flexibility (elasticity) become appropriate.

(A-2) Heat-shielding pigment and white pigment

In the water-based heat shielding paint according to the present invention, the heat shielding pigment may mean a pigment having infrared reflecting properties of solar heat, and in general, the excellent light scattering power of a metal powder such as aluminum is applied, and it is converted into heat energy, especially among sunlight. It is characterized in that it is a heat-shielding pigment that has a function of reflecting infrared rays that are likely to occur.

In addition, as a heat shielding pigment that can be used in the present invention, as a non-limiting example, an inorganic heat shielding pigment (chrome, non-chromium), an organic heat shielding pigment (azomethine), which is a pigment having infrared reflecting properties of solar heat. Azo-based, perylene-based), a dark blue mixed pigment monochromatic system, etc. can be mentioned.

In the present invention, the white pigment is selected from fine particles of metal oxides such as titanium oxide, has excellent light scattering power, has a function of reflecting infrared rays that are particularly easily converted to thermal energy among sunlight, and has a wavelength in the near-infrared region. By reducing the amount of heat that reflects and transmits light rays, it not only improves the whiteness of the coating, but also improves the heat shielding performance together with the heat shielding pigment.

In the present invention, the above-described heat shielding pigment and white pigment can obtain excellent physical properties by experimentally using heat shielding pigments and white pigments having high general reflectance and long-wave reflectance, and obtaining an appropriate amount.

According to one preferred variant of the present invention, the heat shielding pigment is a pigment having excellent heat reflectance, and is divided into a hollow glass bubble and a heat shielding pigment that combines coloring, wherein the hollow glass bubble covers a wavelength of 300 to 2,500 nm, which is a wavelength range of near infrared rays, by 90%. It reflects abnormally and generates ceramic bubbles on the top of the coating film after drying to block heat energy by radiating heat energy with long-wave electromagnetic waves.The heat shielding pigment is a colored pigment pre-treated with a compound of zirconium and aluminum, and has high solar reflectance and long-wave reflectance, resulting in a heat shielding effect. Can be maximized. However, the hollow glass bubble has a disadvantage in that the air layer is formed inside the pigment, so that when applied to a top coat material, the flexibility and gloss are deteriorated.

In the present invention, a colored heat shielding pigment (Tipaque CR-97-Ishihara Co., Ltd. or Daipytroxide Brown 9290-Daeil Purification Industry Co., Ltd.) exhibiting excellent heat shielding effect with high gloss may be used.

In the present invention, the amount and ratio of use of the heat shielding pigment and the white pigment are not particularly limited, but may be used in an amount of 0.1 to 2% by weight of a heat shielding pigment and 10 to 30% by weight of a white pigment based on the aforementioned water-based heat shielding paint. have.

(A-3) additive

In the aqueous thermal barrier paint according to the present invention, a diluent, an antifoam, an emulsifier, an additive for surface control, a dispersant, an inorganic pigment (colored pigment), an adhesion promoter, a thickener, an antifreeze agent, a UV stabilizer, a preservative, a film forming agent, an insect repellent, an antibacterial agent, It may contain an acidity regulator or the like as appropriate.

Each of the additives is based on the total weight of the total coating composition, based on the total weight of the coating composition, diluent 1-5% by weight, antifoaming agent 0.1-0.5% by weight, emulsifier 0.1-0.5% by weight, surface control additive 0.1-0.5% by weight, dispersant 0.5-1% by weight, inorganic Pigment (colored pigment) 5-10% by weight, adhesion promoter 0.1-0.5% by weight, thickener 0.1-0.5% by weight, freeze inhibitor 1.-1.5% by weight, UV stabilizer 0.1-0.5% by weight, preservative 0.1-0.5% by weight, It is preferably contained in the range of 1 to 2% by weight of a coating film forming agent, 0.1 to 0.5% by weight of an insect repellent, 0.1 to 0.5% by weight of an antimicrobial agent, and 0.1 to 0.5% by weight of an acidity control agent, but may be added or subtracted as necessary.

The diluent generally means water in an aqueous paint, but in the present invention, it refers to a component added to adjust the concentration and/or viscosity of the water-based paint without binding or binding to a binder. As such a diluent, glycol ether, ester alcohol, terpene, or texanol (Texanol: 2,2,4-trimethyl-1,3-pentanediol monoisobutyrate), or a mixture thereof may be used.

For example, glycol ethers include butyl Carbitol (diethylene glycol monobutyl ether); Dibutyl Carbitol (diethylene glycol dibutyl ether), butyl Carbitol (diethylene glycol monobutyl ether acetate) may be used, and the terpene may be used alone or in combination with alpha- or beta-terpineol.

The amount of the diluent can be adjusted depending on the type and amount of other ingredients used, and the working conditions, but it is preferable to include 10 to 200 parts by weight based on 100 parts by weight of the binder. If the diluent is included in excess of 200 parts by weight, the viscosity and thixotropic decreases and adhesion is lowered.If the diluent is included in less than 10 parts by weight, the viscosity and thixotropic increase, so that the application and workability There is a problem of deterioration.

Antifoaming agent is an additive that suppresses the formation of air bubbles or removes air bubbles generated during the formation of a coating film after coating. It improves the appearance of the coating film when drying the coating by removing air bubbles in the paint during production or work. If is not used, air bubbles are generated in the coating film, and if an excessive amount is used, the appearance of the coating film becomes poor, such as a crater phenomenon. In the present invention, an aqueous silicone antifoaming agent can be preferably used.

When there is an oil phase and an aqueous phase in one system, an interface between the two phases is created if they are not mixed. When surfactant is added, the polar group of the active agent is dissolved in water and the non-polar group is dissolved in the oil phase. Therefore, an emulsifier is used for this purpose, and if an emulsifier is not used, problems may occur during layer separation of the paint and formation of a coating film.

As an additive for surface control , water-based silicone-based surface control additives smooth the surface of the coating film during work, so that the appearance of the coating film is good when the coating film is dried. It serves to improve problems such as.

Dispersants are additives that uniformly disperse a solid pigment in a liquid resin in the manufacturing process of colored paints to improve softening performance and prevent re-aggregation of pigments. These dispersants, as dispersants improve the dispersion of pigments and extenders in the paint, influence the visual effect and hiding power of the coating film, and play an important role in the manufacture of paints, storage and painting. The dispersant is a wet dispersant for water-based paints. It is preferable to use a dispersant for organic inorganic pigments.

Inorganic pigments (colored pigments) can be used to realize the color of the paint, or can achieve effects such as coloring of the paint and imparting hiding power. As the colored pigment, one or more of inorganic pigments commonly used in the art may be selected. In addition, these inorganic pigments (colored pigments) are particularly required to have good durability. If the durability of the paint, in particular, light resistance, acid resistance, etc. are poor, the color of the paint may change color within tens of days. In recent years, air is polluted with acidic substances due to air pollution, and when it is mixed with rainwater and becomes acidic, when the coating is wetted, pigments with weak acid resistance are discolored. Considering these points, good physical properties can be obtained by selecting a pigment with good durability.

The leveling agent is an additive that prevents defects on the surface of the coating film caused by a convection phenomenon or a difference in surface tension during coating film formation.

The anti-settling agent is an additive that prevents the pigment in the paint from settling and forming a cake shape at the bottom of the container.

The adhesion promoter serves to increase the adhesion between the substrate and the coating film when drying the coating film, and phosphoric acid-acrylic and succinate ester-based, acrylate polyester oligomers, gamma-methacrylooxapropyltrimethoxysilane, tris-omega- Although methoxyethoxy silane or the like is used, it is preferable to use an acrylatide polyester oligomer.

Thickeners are used to control viscosity, impart thickening and thixotropic properties, prevent sedimentation of particles, improve redispersibility, improve flowability, and improve storage stability of particles, and are effective in physical properties and storage properties of paints.

Freeze inhibitor is an additive used in water-based paints, and water-based paints contain a large amount of water, so if left at low temperature for a long time, freezing occurs and the acrylic emulsion is destroyed.However, it is desirable to restore it as the temperature gradually increases even if it is frozen. As an additive for freezing stability of the paint, one or more glycols such as ethylene glycol, propylene glycol, and the like can be selected. If the antifreeze agent is not added, the paint is frozen and the paint loses its function.

The UV stabilizer prevents the color fading due to contact with ultraviolet rays and air when the coating film is dried or after drying. The UV stabilizer is the most excellent in controlling color fading and yellowing over a long period of time. Good physical properties can be obtained in terms of weather resistance of the coating film by air. In addition, UV stabilizers are divided into UV absorbers and UV blockers according to their function and are characterized in that at least one selected from benzotriazo-based, benzophenone-based, triazine-based, organonickel-based and UV-blocking agents, and ultraviolet absorbers.

The coating film forming agent is an important material for coating film formation, coating material properties, contamination, adhesion, etc., and can be selected from one or more water-based coating film forming aids, and the physical properties of the paint depending on the glass transition temperature of the acrylic emulsion and MFFT (lowest film forming temperature). Because this will vary, it is desirable to use an experimentally appropriate amount.

Preservatives play a role in preventing decay in the container of the paint or the collapse of the coating film by the action of microorganisms (bacteria, bacteria). It is an additive added to prevent decay and preservation for long-term preservation. The paint loses its function due to decay and odor.

Insect repellents and antibacterial agents are additives for the purpose of mold resistance, bacteria resistance, and insect repellency, and affect the storage of paints and long-term properties after film formation.

The acidity modifier is stable within a certain pH range, and is unstable outside that range. There is also a stable pH range for emulsion paints. The viscosity of the paint is affected by pH and has the effect of preventing the hydrolysis of vehicles or protective colloids and the growth of bacteria. It mainly uses volatile hydrochloric acid or ammonia, and as a buffering agent, there are heavy carbon salts and phosphates. In addition, water-soluble resin paints are neutralized with carboxylic acid groups or sulfonic acid groups to be water-soluble. Examples of neutralizing agents include ammonia and organic amines (tertiary amines and alcohol amines). By using an acidity control agent, stable intrinsic properties of the paint can be obtained. I can.

B. Water-based insulation paint and insulation layer

In the present invention, the water-based insulating paint may include a hollow pigment, a white pigment, an extender pigment, an elastic binder resin, a diluent and other additives dissolved or dispersed in water. For example, the aforementioned water-based insulating paint is 0.1 to 2% by weight of a hollow pigment, 1 to 5% by weight of a white pigment, 20 to 40% by weight of an extender pigment, 40 to 60% by weight of an elastic binder resin, and 1 to 5% by weight of a diluent. , 5 to 15% by weight of additives and the remaining amount of water may be included.

The aforementioned water-based thermal insulation paint can be prepared in a method comprising the following steps:

(2a) An elastic binder resin (eg acrylic emulsion resin) and additives (eg thickener, emulsifier, antifoam) were added to water and stirred for 30 minutes,

(2b) To the obtained formulation, a hollow pigment, a white pigment, and an extender pigment were added and stirred at 1,000 to 1500 rpm for 1 hour,

(2c) Prepared by adding additional elastic binder resin (e.g. acrylic emulsion resin), additives (e.g. diluent, antifoaming agent, thickener) and residual amount of water to the obtained blend and stirring at 1,000 to 1,500 rpm for 1 hour. Can be.

(B-1) elastic binder resin

In addition, the elastic binder resin of the aforementioned water-based insulating paint may be selected from acrylic emulsion resins, and non-limiting examples thereof include methyl methacrylate, methacrylic acid, butyl methacrylate, hydroxypropyl methacrylate, and ethylene. Glycol dimethacrylate, butylene glycol trimethacrylate, polyethylene glycol trimethacrylate, pentaacryldiol trimethacrylate, alkyl methacrylate, cycloalkyl methacrylate, ethyl methacrylate, isobutyl methacrylate , t-butyl methacrylate, triethylpropane tri methacrylate, trimethylolpropane tri methacrylate, 2-hydroxyethyl methacrylate, 2-hydroxypropyl methacrylate, 4-hydroxybutyl acrylate, At least one may be selected from the group of copolymers of acrylic monomers such as 2-hydroxyethyl acrylate, 2-hydroxypropyl acrylate, and 4-hydroxybutyl methacrylate.

In the present invention, the aqueous acrylic emulsion resin described above may preferably have waterproof and elastic properties, and for this purpose, a monomer, oligomer and/or polymer having a crosslinkable linking group may be further included.

(B-2) Hollow pigment, white pigment and extender pigment

In the present invention, the hollow pigment is a hollow pigment having a light specific gravity and excellent strength as a ceramic spherical powder having closed cells as a hollow filler. As the hollow pigment, inorganic oxides such as silica, titania, or zirconia having a porous structure can be used, and preferably, a shell made of inorganic oxides such as silica, titania or zirconia, and an internal structure filled with air, and particles are As a ceramic spherical powder with closed cells, it has a wide range from micron (㎛) size to millimeter (mm) size, but has many pores inside the particle, has low thermal conductivity, blocks heat energy, has a light specific gravity and has excellent strength. Pigments can be used.

If a lot of hollow pigments are used, there is a problem of viscosity adjustment and reduction of gloss, and if they are used less, there is also a disadvantage that intrinsic properties cannot be obtained. Excellent physical properties can be obtained by obtaining an appropriate amount experimentally.

In the present invention, the white pigment may be the same as those used in the aforementioned (A-2) heat shielding pigment and white pigment.

In the present invention, the extender pigment may be selected from a mixture of fillers and extender pigments such as calcium carbonate, talc, silica sand, mica, kaolin, etc., and extender pigments such as calcium carbonate, talc, silica sand, mica, kaolin, etc. Can be preferably used because it is effective in controlling physical properties such as fluidity and viscosity of a paint, and controlling strength, durability, and gloss of a coating film.

According to one variant of the present invention, in some cases, an inorganic pigment (colored pigment) as described above may be additionally used.

(B-3) additive

Also in the water-based insulating paint according to the present invention, as an additive, a defoaming agent, an emulsifier, an additive for surface control, a dispersant, an inorganic pigment (colored pigment), an extender pigment, an adhesion promoter, a thickener, an antifreeze agent, a UV stabilizer, an antiseptic agent, a film forming agent, It may contain an insect repellent, an antibacterial agent, a PH regulator, etc. as appropriate. These types, uses, and contents are as described in (A-3) Additive.

C. Two-layered heat-shielding waterproof coating and its formation method

In the present invention, the heat-shielding waterproof coating film of a two-layer structure comprising a heat-shielding layer and a heat-insulating layer can be formed by applying the above-described water-based heat-shielding paint and water-based heat-insulating paint to a roof or roof base layer or undercoat layer.

Specifically, the heat-shielding waterproof coating film of a two-layer structure made of a heat-shielding layer and a heat-insulating layer according to the present invention may be installed, for example, on a rooftop or roof base layer or undercoat layer by a method comprising the following steps. have:

(1) Prepare a roof or roof base layer or undercoat layer selected from the group consisting of metal, plastic, wood, paint coating, cement, asphalt, etc.,

(2) To all or part of the base layer or undercoat layer, a water-based insulating paint as described above, for example, 0.1 to 2% by weight of a hollow pigment, 1 to 5% by weight of a white pigment, 20 to 40% by weight of an extender pigment %, acrylic emulsion resin 40-60% by weight, diluent 1-5% by weight, additive 5-15% by weight, and water-based insulation paint containing a residual amount of water is applied to form a thermal insulation layer,

(3) To all or part of the heat insulating layer, a water-based heat shielding paint as described above, for example, 0.1 to 2% by weight of a heat shielding pigment, 10 to 30% by weight of a white pigment, 40 to 60% by weight of an acrylic emulsion resin, a diluent A heat shielding layer is formed by applying a water-based heat shielding paint containing 1 to 5% by weight, 5 to 15% by weight of an additive, and a residual amount of water,

(4) In some cases, further forming a transparent ultraviolet protective layer on the heat shielding layer.

The above-described transparent ultraviolet protective layer may be formed of a transparent acrylic resin including a ultraviolet protective agent, and the ultraviolet protective agent may include an organic ultraviolet protective agent or an inorganic ultraviolet protective agent such as titania.

In the present invention, the roof or roof primer treatment may be performed by a method commonly known in the art, for example, by applying a primer coating or installing a waterproofing material or a waterproof coating made of a polymer. have.

According to one advantage of the present invention, in a two-layered heat-shielding waterproof coating formed by forming a two-layer structure of a heat shielding layer and a heat insulating layer on a roof and a roof, the upper heat shielding layer includes a heat shielding pigment and has a glass transition temperature of 10. By using an acrylic emulsion binder resin having a temperature of C or higher, and forming it in a two-layer structure together with a heat insulating layer using another acrylic emulsion binder resin. First, it can maximize the effectiveness of heat-shielding pigments and heat-insulating hollow pigments, so that it can effectively exert heat-shielding and heat-insulating effects.Second, it can maintain excellent adhesion between the heat-shielding coating and the roof and roof substrate layers immediately after application and after prolonged exposure to sunlight. Third, it has excellent gloss and appearance, and fourth, it is advantageous to the environment and has excellent workability because it is based on water.

According to a particularly preferred advantage of the present invention, due to the two-layer structure of the heat shielding layer and the heat insulating layer using different binders, even when exposed to sunlight for a long time and severe climate change on a roof or roof, excellent adhesion durability and weather resistance can be obtained. have.

Hereinafter, preferred embodiments of the present invention will be described. However, the following examples are only preferred examples of the present invention, and the present invention is not limited to the following examples.

Example 1

(1) Preparation of water-based thermal barrier paint for top coat

While 14.2 parts by weight of water was stirred at 1,000-1,500 rpm using a stirrer, 0.2 parts by weight of a thickener, 0.4 parts by weight of a dispersant, 0.5 parts by weight of an emulsifier, and 0.4 parts by weight of an antifoam were added, followed by dispersion stirring for 30 minutes.

0.1 parts by weight of a heat shielding pigment (JR-1000) and 27 parts by weight of a white pigment (Tiona 595) were added to the mixture, and the mixture was stirred at 1,000 to 1,500 rpm for 1 hour, followed by dispersion and stirring so that the pigment particle diameter became 20 μm or less.

Disperse 50.5 parts by weight of acrylic emulsion resin (Samhwa Paint Industries), 0.1 parts by weight of anti-settling agent, 1.5 parts by weight of diluent (ATBC), 0.3 parts by weight of antifoaming agent, 0.4 parts by weight of thickener, and use a stirrer at 1,000-1,500 rpm for 10 minutes Stirred.

(2) Preparation of water-based insulating paint for intermediate use

In 4.8 parts by weight of water, 17 parts by weight of an acrylic emulsion resin (ACRONAL PS 791ap) was added, and while stirring, 0.3 parts by weight of a thickener, 0.3 parts by weight of an emulsifier, and 0.2 parts by weight of an antifoam were added, followed by dispersion stirring for 30 minutes.

Hollow pigment (PG-1001) 0.1 parts by weight, white pigment (Ti-Pure Rutile Titanium Dioxide R706) 2.8 parts by weight, extender pigment (Omyacarb 1-HB) 32.2 parts by weight was added to the mixture and stirred at 1,000 to 1,500 rpm for 1 hour I did.

5 parts by weight of an acrylic emulsion resin (ACRONAL PS 791ap), 2.5 parts by weight of a diluent (Texanol), 1.9 parts by weight of water, 0.8 parts by weight of an antifoam, and 0.3 parts by weight of a thickener were added to the formulation, followed by stirring at 1,000 to 1,500 rpm for 1 hour.

(3) Installation of 2-coat type heat shielding coating

The resulting water-based heat-shielding paint for top coat and the water-based heat insulating paint for mid-way were applied to the primer-treated roof as a top coat and a middle coat, respectively, to install a two-coat type heat-shielding coating, and the heat-shielding ability, adhesion, and adhesion durability under sunlight were tested.

Using the method described in Test Examples 1 and 2, it was confirmed that the above-described two-coat type heat shielding coating has excellent heat shielding ability, adhesion, and adhesion durability under sunlight (see Table 1 below).

Reference Example 1

A water-based heat-shielding paint for a top coat using a heat-shielding pigment and a water-based water-based paint for a middle coat without a hollow pigment were prepared, respectively.

The resulting water-based thermal barrier paint and intermediate water-based paint were applied to the primer-treated roof substrate layer as a top coat and a middle coat, respectively, to install a two-coat type heat-shielding coating, and test heat shielding ability, adhesion, and adhesion durability under sunlight. .

Using the methods described in Test Examples 1 and 2, it was confirmed that heat shielding properties, adhesive strength, and adhesion durability under sunlight were excellent, but it was confirmed that the thermal insulation properties were inferior to that of Example 1 (see Table 1 below). After long-term sunlight irradiation, there is a fear that some properties of the heat insulating layer may become poor or further deteriorate.

Comparative Example 1 (Control)

A water-based paint for a top coat and a water-based paint (waterproofing material) for a bottom coat were prepared, respectively, without using a heat shielding pigment or a hollow pigment, and a two-coat type paint coating was installed by applying each as a top coat and a middle coat to the primer-treated roof substrate layer, Using the method described in Test Examples 1 and 2, the heat shielding ability, adhesion, and adhesion durability under sunlight were tested.

The adhesion and adhesion durability under sunlight were similar to the results of Example 1 and Reference Example 1, but the heat shielding property was not shown (see Table 1 below).

Test Example 1: Measurement of physical properties of paint

* The heat-shielding paint and the heat-insulating paint prepared in Example 1 and Comparative Examples 1 and 2 were each coated with a dry film thickness of 100 μm, dried naturally at room temperature for 7 days, and then physical properties were measured by the following method.

1-1. Gloss (60° glossiness) measurement method

According to the test method 3312 of KS M 5000, the glossiness of the coating film is measured with a 60° gloss meter (Tri-Microgloss 20-60-85) and expressed as a numerical value.

1-2. Water resistance measurement method

A coating film (Sample 1) obtained by coating a glass plate (15mm×15mm×5mm) to a dry film of about 50 μm with a film applicator and air drying at room temperature for 7 days was immersed in distilled water for 168 hours. , Visually inspect the coating film for abnormalities.

1-3. Alkali resistance measurement method

The coating film (Sample 1) prepared in the same manner as above was immersed in a 5% sodium hydroxide aqueous solution for 168 hours, and then visually inspected for abnormalities in the coating film.

1-4. Method of measuring solvent resistance

The coating film (Sample 1) prepared in the same manner as above was immersed in xylene for 168 hours, and then visually inspected for abnormalities in the coating film.

1-5. Impact resistance measurement method

A coating film (Sample 2) obtained by air drying at room temperature for 7 days after coating a tin plate (15 mm × 10 mm × 0.1 mm) with a dry film thickness of about 50 µm with a film applicator was used as a DuPont type. It is dropped from a height of 30cm with an impact tester with a load of 500g. If the coating film is not peeled off during visual inspection, it is considered good, and if the coating film is peeled off, it is considered bad. At this time, the impact surface is a 1/2 inch spherical surface.

1-6. Flexibility Measurement Method

The midpoint of the test piece made of the coating film (Sample 2) prepared in the same manner as above was placed on 1/8 inch of a Mandrel Tester and completely bent for 1 second. At this time, if cracking and peeling of the coating film does not occur during visual inspection at the bent part of the test piece, it is considered good, and if cracking and peeling of the coating film occurs, it is regarded as defective.

1-7. How to measure adhesion

According to the test method of Test Method B of ASTM D3359, the dried coating film is scraped at intervals of 2 cm with a knife to cross each other with a knife to make 25 compartments, and then adhere to the area with 3M transparent tape. Evaluate.

5B: No peeling of coating film

4B: Less than 5% peeling of coating film

3B: 5 to 15% of peeling of coating film

2B: 15 to 35% of peeling of coating film

1B: 35 to 65% of peeling of coating film

0B: 65% or more of peeling of coating film

1-8. Accelerated weatherability measurement method

According to Test Method 3231 of KS M 5000, after exposing the test piece to an accelerated weathering device (ATLAS Ci5/DMC Weather-ometer) for 250 hours, visually inspect the appearance of the coating film.

The results are shown in Table 1 below.

Example 1 Reference Example 1 Comparative Example 1 Polish 85 85 87 Water resistance clear clear clear Alkali resistance clear clear clear Solvent resistance clear clear clear Impact resistance Good Good Good Flexibility Good Good Good Adherence 5B 5B 5B Accelerated weathering clear clear clear

Test Example 2: Measurement of heat-shielding property and thermal insulation property of a two-layer paint The topcoat water-based paint and the intermediate coat water-based paint of Example 1, Reference Example 1, and Comparative Example 1 were each coated with a dry film thickness of 100 µm, and then at room temperature 7 The heat shielding property and/or thermal insulation property were measured by the following method by naturally drying for one day, and the results are shown in Table 2, and are shown in graphs in FIGS. 1 (internal temperature) and FIG. 2 (external temperature).

Specifically, the primer-treated steel plate (300mm×300mm×0.5mm) is coated with a brush or spray to a dry thickness of about 100 μm, and then naturally dried at room temperature for 7 days to prepare a test piece, which It was mounted on the roof of a model house (250mm×250mm×150mm) made of the material of which the roof was opened, and sealed so that outside air did not enter. Irradiate for 30 minutes with an infrared lamp (PHILIPS IP 250R-230V, 230W) at a height of 30 cm above the specimen, and over time, the surface temperature of the roof (i.e., the surface temperature of the specimen) and the room temperature under the roof (i.e., internal Temperature) is measured with a digital temperature sensor (OMEGA, Model HH21), and the relative heat shielding performance is measured as the temperature difference after irradiation for the first time, 30 minutes and 60 minutes. The above-described heat shielding and thermal insulation performance measurement equipment is installed in a closed place.

location Coating Early 5 minutes 10 minutes 20 minutes 30 minutes 40 minutes 50 minutes 60 minutes Temperature difference
(30 minutes) Temperature difference
(60 minutes) Internal temperature
(℃) Comparative Example 1 22.1 32.5 38.7 45.1 49.9 53.7 58.7 27.8 37.6 Reference Example 1 22.7 28.9 32.4 35.9 38.5 40.7 42.6 43.9 15.8 21.2 Example 1 22.5 28.6 32.1 35.4 38 40.3 42.3 43.5 15.5 21.0 Outside temperature
(℃) Comparative Example 1 23.5 50.6 55.3 59.3 63 65.5 67.6 69.1 39.5 45.6 Reference Example 1 23.2 36.5 39.3 41.3 43.4 45.2 47.2 47.8 20.2 24.6 Example 1 23 36.7 39.5 41.6 43.3 45.1 47.2 47.5 20.3 24.5

From Table 1 above, compared to a two-coat type paint (Comparative Example 1) using a general water-based paint for top coat and a water-based medium paint (Comparative Example 1), a two-coat type paint formed using the water-based heat insulating paint for a top coat according to the present invention It can be seen that Example 1 and Reference Example 1) exhibit excellent heat shielding properties. In addition, it can be seen that when the intermediate water-based insulating paint according to the present invention is applied (Example 1), the internal temperature differs by up to 0.5°C compared to the case where it is not applied (Reference Example 1). It shows that the heat shielding effect, i.e., heat insulation, appears

The present invention can be industrially useful in the paint industry.

Claims (7)

To form a waterproof coating consisting of a base layer, a heat insulating layer, a heat shielding layer and a transparent UV protective layer on the roof, As a heat shielding waterproof coating method:
(1) preparing a base layer by primer-treating a base layer for a roof or a waterproof coating,
(2) On the undercoat layer, 0.1 to 2% by weight of hollow pigment, 1 to 5% by weight of white pigment, 20 to 40% by weight of extender pigment, 40 to 60% by weight of elastic binder resin, 1 to 5% by weight of diluent, additive 5 Applying and drying a water-based insulating paint containing -15% by weight and a residual amount of water to form an insulating layer,
(3) On the heat insulating layer, 0.1 to 2% by weight of a heat shielding pigment containing aluminum metal powder, 20 to 40% by weight of white pigment, 40 to 60% by weight of acrylic binder resin, 1 to 5% by weight of diluent, 5 to 15% by weight of additives Applying and drying an aqueous heat shielding paint containing% and a residual amount of water to form a heat shielding layer,
(4) further applying a transparent ultraviolet protective layer on the heat shielding layer;
Containing,
Heat-shielding waterproof painting method. The method of claim 1,
The hollow pigment is characterized in that selected from the group consisting of porous silica, porous titania, hollow silica and hollow titania,
Heat-shielding waterproof painting method. delete delete The method of claim 1,
The water-based insulation paint,
(1a) an acrylic emulsion resin, and one or more additives selected from the group consisting of a thickener, an emulsifier, and an antifoaming agent are added to water and stirred for 30 minutes,
(1b) To the obtained formulation, a hollow pigment, a white pigment and an extender pigment were added and stirred at 1,000 to 1500 rpm for 1 hour,
(1c) It is characterized in that it is prepared by adding at least one additive selected from the group consisting of an additional acrylic emulsion resin, a diluent, an antifoaming agent and a thickener, and a residual amount of water to the obtained formulation and stirring at 1,000-1,500 rpm for 1 hour. doing,
Heat-shielding waterproof painting method. The method of claim 1,
The water-based heat shielding paint,
(2a) At least one additive selected from the group consisting of a thickener, a dispersant, an emulsifier and an antifoam is added to water, and stirred at 1,000 to 1,500 rpm for 30 minutes,
(2b) To the obtained blend, a heat shielding pigment and a white pigment containing aluminum metal powder were added, and the pigment was stirred at 1,000-1,500 rpm for 1 hour and 30 minutes so that the average particle diameter of the pigment became 20 μm or less,
(2c) It is characterized in that it is prepared by adding one or more additives selected from the group consisting of an acrylic emulsion resin and an anti-settling agent, a diluent, an antifoaming agent, and a thickener as a binder, and stirring at 1,000-1,500 rpm for 1 hour and 30 minutes. With,
Heat-shielding waterproof painting method. A heat-shielding waterproof coating formed by the heat-shielding waterproofing coating method according to any one of claims 1, 2, 5, and 6, comprising an undercoat layer, a heat insulating layer, a heat shielding layer, and a transparent UV protective layer.

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