JP6944757B2 - Combination of radiant heat insulation refractory paint and additives and painting method using it - Google Patents

Description

The present invention relates to the combination of the additive and the release morphism adiabatic refractory coatings and coating method using the same.

The surfaces of buildings, structures, paved roads, etc. that use metal, wood, concrete, asphalt, gypsum board, etc. absorb electromagnetic waves such as infrared rays and visible rays emitted from sunlight well. Such a phenomenon causes the so-called heat island phenomenon. Conventionally, attempts have been made to solve the heat island phenomenon with paint.

Patent Document 1 discloses a heat insulating paint containing soda glass aluminosilicate, a pigment (titanium dioxide), a resin emulsion, a dispersant, and a pressure-sensitive adhesive as the above-mentioned paint. In this heat insulating paint, the soda glass aluminosilicate has a hollow bead structure, the particle size thereof is 10 to 50 μm, and 10 to 20% by weight of the total weight is contained. A water-soluble acrylic emulsion resin is used as the resin emulsion, and the resin emulsion contains, for example, about 60% by weight of the total weight.

In Patent Document 1, for example, by applying such a heat insulating paint to the outer wall or the inner wall of a building to form a heat insulating layer, heat intrusion from the outside is blocked in the summer, and the heat of heating is outdoors in the winter. It is said that it can effectively block the conduction to. As a result, a high energy saving effect can be obtained and a great contribution to the carbon dioxide reduction effect can be obtained. Since the sound insulation effect is also high, it is possible to reduce noise in manufacturing factories and the like, and it is possible to suppress deterioration of the environment outside the building. In addition, the cooling cost in summer and the heating cost in winter can be significantly reduced.

However, in the above-mentioned prior art, there is still room for improvement as described below.

That is, the heat insulating coating material disclosed in Patent Document 1 has a high content of resin emulsion. Therefore, the formed coating film has a problem that the heat emissivity is low and the amount of heat storage is large. In particular, in the summer, the energy saving effect was not sufficient in that the indoor temperature did not drop well due to the heat storage by sunlight and the cooling load was increased.

JP-A-2002-105385

The present invention was conceived under the above-mentioned circumstances, and by improving the heat radiation performance, a coating film having excellent heat insulating properties and even better fire resistance is formed. It is an object of the present invention to provide a combination of a radiation-insulated fire-resistant paint and an additive and a coating method using the same.

In order to solve the above problems, the following technical measures are taken in the present invention.

The combination provided by the first aspect of the present invention is a combination of a radiant heat insulating and fire resistant paint having improved thermal radiation performance of a coating film and an additive added to the radiated heat insulating and fire resistant paint, and is the radiation heat insulating material. The refractory coating material contains hollow particles, an organic binder, and an inorganic binder, and the hollow particles are formed of an inorganic material. The organic binder is blended as an aqueous emulsion, and the inorganic binder is scaly. It is characterized in that at least silica is blended, the scaly silica improves the thermal radiation performance of the coating , and the additive contains divalent iron .

Preferably, the scaly silica is blended so that the total hemispherical emissivity exhibiting the thermal radiation performance is 0.85 to 1.00.

Preferably, the divalent iron is blended as a divalent iron salt.

Preferably, the divalent iron salt is made of ferrous sulfate.

Preferably, before Symbol additive is configured to further containing silica and / or alumina.

Preferably, the additive is configured to be added to the radiant heat insulating refractory paint at the time of use.

The coating method provided by the second aspect of the present invention is a coating method in which a substrate is coated using the combination provided by the first aspect of the present invention, and is added to the radiation-insulated fireproof coating material. It is characterized by having a coating liquid preparation step of adding an agent and preparing a coating liquid, and a coating step of applying the coating liquid prepared in the coating liquid preparation step to the base material .

The combination of the radiation-insulated fire-resistant paint of the present invention and the additive and the coating method using the same provide a coating film having excellent heat-insulating properties and further good fire-resistant performance by improving the heat radiation performance. It has the advantage that it can be formed.

Other features and advantages of the present invention can be further clarified from the following description of embodiments of the invention.

It is a table which shows the total hemispherical emissivity of the coating film obtained by applying the radiant heat insulating refractory paint which concerns on Example of this invention. It is a graph which shows the temperature change with the lapse of time when the light of 40W white sphere is irradiated on the coating film surface obtained by applying the radiation heat insulating fireproof paint which concerns on Example of this invention. FIG. 3A shows a change in the facing temperature of the coating film with the passage of time by irradiating the surface of the coating film with light of 40 W white spheres when the radiant heat insulating and fireproof coating material according to the embodiment of the present invention is colored white. It is a graph which shows the result of having measured. FIG. 3B shows that when the radiant heat insulating and fireproof paint according to the embodiment of the present invention is colored on the Nikko color chart number C-75-60B, the surface of the coating film is irradiated with 40 W white sphere light for a period of time. It is a graph which shows the result of having measured the change of the face-to-face temperature of a coating film with the lapse of time. FIG. 4A is a graph showing the relationship between changes in rooftop outside air temperature, attic temperature, and room temperature with the passage of time before the radiant heat insulating fireproof paint according to the embodiment of the present invention is applied to the roof of a building. be. FIG. 4B is a graph showing the relationship between changes in rooftop outside air temperature, attic temperature, and room temperature with the passage of time when the radiant heat insulating fireproof paint according to the embodiment of the present invention is applied to the roof of a building. be.

Hereinafter, preferred embodiments of the present invention will be specifically described. The numerical range indicated by using "-" in the present invention indicates a range including the numerical values before and after "-" as the minimum value and the maximum value, respectively.

The radiant heat insulating fireproof paint of the present embodiment is, for example, the roof / wall / veranda / storage hut / parking lot / shutter of a house, the roof / wall / facility tank / piping of a factory, the roof / wall / roof of a public facility such as a hospital.・ Parking lots, roofs / walls / poolsides of sports facilities, pavements of park facilities, pavements of leisure facilities, parking lots, roofs / walls of agriculture / fishery facilities, roofs / walls of buildings / apartments, roofs of restaurants / discount stores -Used for painting walls, roofs and walls of prefabricated huts, and roofs of vehicles such as cold storage vehicles. That is, it is mainly used for painting exterior surfaces such as outer walls, roofs, and rooftops of buildings. Among these, it is particularly preferably applied to the outer wall surface of a building.

Examples of the base material of the exterior surface of the building include concrete, mortar, metal, plastic, and various boards. Specific examples of the metal include iron, aluminum, and copper. Specific examples of the boards include a slate board, an extruded board, a siding board, and an ALC board (lightweight cellular concrete board). These substrates may have a coating film already formed. The radiant heat insulating and refractory paint is mainly applied to existing buildings, but the boards can also be applied in advance at a factory or the like.

[Ingredients of radiant heat insulation and refractory paint]
The radiant heat insulating refractory paint of the present embodiment contains hollow particles (hollow balloons), organic binders, inorganic binders, infrared reflective powders, modified silicones, and other fillers. Each component will be described below.

(Hollow particles (hollow balloons))
Hollow particles are components that are added to impart heat insulating properties to the coating film. Hollow particles are classified into open-cell type hollow particles and closed-cell type hollow particles. Of these, closed-cell type hollow particles are preferably used in the present embodiment. This is because the closed-cell type hollow particles can exhibit higher heat insulating performance. The closed-cell type hollow particles may be a single hollow type having one hollow, or may be a multi-hollow type having two or more hollows. The inside of the hollow particles is filled with gas, but it may be vacuum or close to vacuum. Examples of the gas that can be filled in the hollow particles include air, aliphatic hydrocarbons, aromatic hydrocarbons, chlorinated hydrocarbons, fluorinated hydrocarbons, and volatile monomers. Examples of the shape of the hollow particles include a spherical shape, an elliptical spherical shape, and a flat spherical shape.

The hollow particles are preferably formed of an inorganic material. Examples of the hollow particles include a shirasu balloon, a glass balloon, and a ceramic balloon. The inorganic material may be natural or artificial, and examples thereof include soda silicate glass, aluminum silicate glass, sodium borosilicate glass, alumina, silas, black stone, and silica. Among these, for example, the shirasu balloon is formed by heating and expanding volcanic glass particles containing silica and alumina as main components in shirasu, which is a volcanic eruption product, at a temperature of about 1000 ° C., and is a closed cell. It is a hollow particle having.

The average particle size of the hollow particles is adjusted to the range of 0.1 to 200 μm, 1 to 150 μm, 10 to 100 μm, 35 to 80 μm, or 30 to 60 μm. The reason why the average particle size is adjusted to such a range is to form a coating film having high smoothness. Such a coating film has high hiding property and infrared reflectivity. The density of hollow particles is adjusted to the range of ^{0.01 to 1 g / cm 3} or 0.01 to 0.5 g / cm ^3. The film thickness of the hollow particles is preferably 1 to 2 μm. The reason for adjusting to such a density is to form a coating film having excellent heat insulating properties and light weight. The content of the hollow particles is preferably adjusted to 5 to 40% by weight, preferably 5 to 10% by weight, based on the total solid content in the coating material. Specifically, as the hollow particles, for example, hollow glass beads manufactured by Potters Barotini Co., Ltd. are used.

(Organic binder)
The radiant heat insulating refractory paint of this embodiment is supplied as an emulsion type paint. The organic binder is blended to improve the adhesiveness and strength of the coating film to the substrate. The emulsion is a floating state in which other liquids (including resin components) that do not dissolve in the liquid are uniformly dispersed in the state of fine particles. Examples of the emulsion include an aqueous emulsion. The emulsion also has a function as a dispersant for paints. As resin components, for example, acrylic resin, vinyl acetate, ethylene vinyl acetate, fluororesin, urethane resin, melamine resin, melamine ester resin, melamine / formaldehyde resin, polyvinyl acetate resin, alkyd resin, modified alkyd resin, polyester resin, unsaturated Polyester resin, aminoalkido resin, urea / formaldehyde resin, dicyanamide / formaldehyde resin, vinyl chloride resin, vinyl acetate resin, phenol resin, epoxy resin (glycidyl ether type, glycidyl ester type, glycidylamine type, cyclic oxylan type, etc.), silicon Examples include formaldehyde resin, silicon resin, and fluororesin. In addition, polyacrylic acid resin, styrene-acrylic acid copolymer resin, styrene-methacrylic acid copolymer resin, styrene-methacrylic acid-acrylic acid ester copolymer resin, styrene-maleic acid copolymer resin, amylene-maleic acid copolymer resin. , Methylstyrene / acrylic acid copolymer resin, vinyltoluene / acrylic acid copolymer resin and the like, or ammonium salts, organic amine salts, alkali metal salts and the like thereof. These resin components may be used alone or in admixture of two or more.

The organic binder has a function of enhancing the prevention of swelling and peeling of the coating film. On the other hand, if the amount of the organic binder is too large, the fire resistance and heat radiation performance of the coating film are deteriorated, which is not preferable. Therefore, in the radiant heat insulating refractory paint, it is preferable to reduce the blending amount of the organic binder as much as possible. The content of these organic binders is preferably adjusted in the range of 1 to 30, 1 to 20, 5 to 15% by weight, or 5 to 10% by weight, based on the total solid content weight of the coating material.

(Inorganic binder)
In the radiant heat insulating refractory paint of the present embodiment, the amount of the organic binder is reduced as much as possible, and the inorganic binder is blended accordingly. The inorganic binder is for improving the thermal radiation performance of the radiation-insulating refractory paint. Further, the inorganic binder is blended together with the above-mentioned organic binder to maintain the adhesion of the coating film to the substrate even if the organic binder is melted or decomposed. The radiant heat insulating refractory paint of the present embodiment contains at least scaly silica as an inorganic binder. Scaly silica is particularly good at improving the thermal radiation performance of radioisotope fireproof paints. Specifically, for example, Sun Lovely LFS (registered trademark) (manufactured by AGC Si-Tech Co., Ltd.) is used as the scaly silica.

As the scaly silica, secondary particles having a silicate layer structure formed by overlapping the planes of the flaky primary particles of silica in parallel are preferable. Among them, so-called layered polysilicic acid or a metal salt thereof is preferable. Examples of the layered polysilicic acid or a salt thereof include Kenyaite, Magadiaite, Macatite, Islayite, Kanemite, Octosilicate, Silica-X, Silica-Y, etc., and salt type of alkali metal or H type obtained by acid treatment thereof. Is used. The aspect ratio (ratio of major axis to thickness) of the layered particles is preferably 10 to 500 or 30 to 300. The primary particles are non-porous scaly particles having a thickness of 0.05 μm or less and have extremely high transparency. The thickness of the secondary particles is 0.05 to 0.5 μm, and the surface diameter is 0.1 to 5 μm. The secondary particles have a large external surface area of 50 to 400 m ² / g and have a gap of 0.05 to 1.0 cc / g in the particles. As a result, the secondary particles can efficiently and easily uniformly disperse or support various functional fine particles (for example, TiO ₂ , ZnO, etc.) on the surface or in the gaps. Is. Since scaly silica is excellent in water resistance, chemical resistance, and heat resistance, it is suitably applied to the radiation-insulated refractory paint of the present embodiment.

The scaly silica may be used as a powder of secondary particles, but it is preferably used as an aqueous slurry in which the secondary particles are dispersed in water. When the water slurry is applied to and dried on the base material, it has self-forming properties and forms a tough and flexible inorganic coating film in which scaly silica fine particles are laminated in parallel with the base material. The secondary particles have silanol groups (-SiOH) per specific surface area of ²⁰ to 70 μmol / m ² , ~ 20 μmol / m ² , ~ 24 μmol / m 2, ~ 30 μmol / m ² , or ~ 70 μmol / m ² . Is preferable. This is very many times to several tens of times that of silica gel, and silanol groups on the surface are bonded to each other by evaporation or heating of water, so that a strong coating film can be formed by self-forming. When it is in the form of a water slurry, it is easy to mix it with an aqueous emulsion of an organic polymer resin or a water-soluble organic polymer resin, improve physical properties such as strength and hardness of these resins, impart surface hydrophilicity, and gas. Transparency can be improved.

The silica concentration in the water slurry is preferably 7 to 17, 10 to 16, 7 to 9, 10 to 12, 14 to 16, 15 to 17% by weight, or 65% by weight or more. The average particle size of the secondary particles is 0.01 to 60 μm, 0.05 to 50 μm, 0.1 to 20 μm, 0.1 to 1.5 μm, 0.2 to 0.5 μm, 0.1 μm, 0.2 μm. , Or 0.5 μm. The surface diameter of the secondary particles is 0.05 to 5 μm, 0.05 to 3 μm, 0.05 to 1 μm, 0.5 to 3 μm, or 1 to 5 μm. The thickness of the secondary particles is 10 to 500 nm, 10 to 100 nm, or 50 to 500 nm. The specific surface area is ~ 370 m ² / g, ~ ²⁰⁰ m 2 / g, ~ 150 m ² / g, or ~ 70 m ² / g.

The radiant heat-insulating refractory paint containing scaly silica has thixotropic properties, and its viscosity decreases in the fluid state, so that it can be applied uniformly and thinly. On the other hand, when it is applied on a base material to form a liquid film, it exhibits high viscosity and therefore has a characteristic of being hard to drip. If the average particle size of the scaly silica is much smaller than the above, the bonding force is not sufficiently generated and the coating film strength is insufficient. On the contrary, if the particle size is larger than this, sufficient thixotropic property is imparted. It is not preferable because it cannot be done.

In the radiant heat insulating refractory paint of the present embodiment, the content of scaly silica is 1 to 40, 1 to 30, 1 to 20, 1 to 10% by weight, or 1 to 5% by weight, based on the total solid content weight of the paint. It is preferable to adjust in the range of%. In the radiant heat insulating refractory paint of the present embodiment, the scaly silica may be contained in a larger amount than the organic binder. When the content of scaly silica is small, the thixotropic property is insufficient and the coating film strength is also likely to be insufficient. On the contrary, when the content is large, the thixotropic property is strong and the viscosity becomes too high, so that uniform coating tends to be difficult.

In the radiant heat insulating refractory paint of the present embodiment, the scaly silica may be mixed with another inorganic binder and used. As an inorganic binder used by mixing with scaly silica, for example, an aqueous solution of alkali metal silicate or alkaline earth metal silicate (water glass, sodium silicate, potassium silicate, calcium silicate, magnesium silicate). , Etc.), silica sol, colloidal silica, alumina sol, zirconia sol, methyl orthosilicate, ethyl orthosilicate, phenyl orthosilicate, tetra-i-propyl titanate, tetra-n-butyl titanate, triethanolamine titanate, zeolite, bentonite, etc. Examples include smectite or water-hardening cement. One or more of the above-mentioned inorganic binders are selected and mixed with scaly silica for use. In the radiant heat insulating refractory coating material of the present embodiment, the inorganic binder may be contained in a larger amount than the organic binder. The content of these inorganic binders is preferably adjusted in the range of 10 to 70, 30 to 70% by weight, preferably 50 to 70% by weight, based on the total solid content weight in the coating material.

(Infrared reflective powder)
In the radiant heat insulating and fireproof coating material of the present embodiment, the infrared reflective powder is a component having a function of suppressing heat storage of the coating film due to sunlight by reflecting infrared rays. Examples of the infrared reflective powder include aluminum flakes, titanium oxide (for example, TiO ₂ ), barium sulfate, zinc oxide, calcium carbonate, silicon oxide, iron oxide, magnesium oxide, zirconium oxide, yttrium oxide, indium oxide, alumina and the like. Can be mentioned. One or more of these can be selected and used. Of these, titanium oxide or a combination of titanium oxide and zinc oxide is particularly preferable.

(Modified silicone)
Modified silicone is added to improve the ease of coating of radiant heat insulating and fire resistant paint, solubility / dispersibility in water, compatibility / reactivity with organic substances, antistatic property, flexibility, lubricity and the like. The modified silicone is a dimethyl silicone introduced with various organic groups. Of these, modified silicones into which a non-reactive organic group has been introduced are particularly preferable. Organic groups are introduced at the ends or side chains of dimethyl silicone. Examples of the organic group include a polyether group, an alkyl group, an aralkyl group, a fluoroalkyl group, a higher fatty acid ester group, a higher fatty acid amide group, and a phenyl group. The content of the modified silicone is preferably adjusted in the range of 10 to 40% by weight, preferably 20 to 30% by weight, based on the total solid content weight in the coating material.

(Other fillers)
In the radiant heat insulating refractory paint of the present embodiment, an inorganic filler is further added for the purpose of improving the coating film strength and the fire resistance performance. As an inorganic filler, it may overlap with the above materials, but for example, calcium carbonate, magnesium carbonate, basic magnesium carbonate, zinc carbonate, barium carbonate, diatomaceous soil, calcium hydroxide, magnesium hydroxide, aluminum hydroxide. , Calcium Oxide, Magnesium Oxide, Aluminum Oxide, Zinc Oxide (ZnO), Titanium Oxide (eg TiO ₂ ), Iron Oxide, Tin Oxide, Antimon Oxide, Calcium Sulfate, Barium Sulfate, Hydrotalcite, Gypsum Fiber, Calcium Silica , Tarku, clay, mica, montmorillonite, active white clay, zeolite, bentonite, sepiolite, imogolite, cericite, glass fiber, glass beads, aluminum hydroxide, boron nitride, silicon nitride, carbon black, carbon fiber, various metal powders, metal oxidation Examples include fine particles and fly ash. It is also possible to use a mixture of two or more of these inorganic fillers. Of course, it can also be used alone. The content of the inorganic filler is preferably adjusted in the range of 10 to 70, 30 to 70% by weight, preferably 50 to 70% by weight, based on the total solid content weight in the coating material.

In addition to the above, components used in ordinary paints can be appropriately added to the radiant heat insulating refractory paint of the present embodiment. For example, surfactants such as antifoaming agents and dispersants, film-forming aids, coloring pigments, plasticizers, leveling agents, viscosity modifiers, emulsifiers and the like can be mentioned. Specifically, for example, a ceramic pigment is used as the coloring paint. Hollow particles (hollow balloons), organic binders, inorganic binders, infrared reflective powders, modified silicones, other fillers, and / or components used in conventional paints are matched to the total solid weight in the paint. It is blended so as to be 100% by weight.

[Additive]
The radiant heat insulating refractory paint of this embodiment is used in combination with an additive. This additive is a coating film curing / strengthening agent, and is added to the radiant heat insulating fireproof paint immediately before coating when the radiant heat insulating fireproof paint is used. As an example of the additive to the radiant heat insulating refractory paint of the present embodiment, one containing divalent iron as a component can be mentioned. The additive may further include silica and / or alumina. It is preferable to add this additive so as to be 3% to 5% with respect to the total solid content weight of the radiant heat insulating refractory paint, to improve the water resistance of the coating film, prevent the occurrence of cracks, prevent swelling, and the like. Added for the purpose. Specifically, as the divalent iron, a ferrous compound which is a compound of divalent iron ions is used. Examples of the ferrous compound include divalent iron ion salts (divalent iron salts). Specific examples of the divalent iron salt include ferrous chloride (FeCl ₂ ), ferrous sulfate (FeSO ₄ ), ferrous nitrate (Fe (NO ₃ ) ₂ ), and ferrous phosphate (Fe ₃ (Fe 3). Inorganic salts such as PO ₄ ) ₂ ), ferrous formate (Fe (HCOO) ₂ ), ferrous acetate (Fe (CH ₃ COO) ₂ ), ferrous propionate (Fe (CH ₃ CH ₂ COO)) ₂ ), ferrous oxalate (FeC ₂ O ₄ ), ferrous tartrate (FeC ₄ H ₄ O ₆ ), ferrous fumarate (FeC ₄ H ₂ O ₄ ), ferrous lactate (Fe (CH) ₃ CHOHCOO) ₂ ) and other organic acid salts can be mentioned. When this additive contains silica, alumina, and ferrous iron, the divalent iron is blended so as to be 3% to 15%, preferably 5% to 10%, based on the total solid content weight of the additive. Will be done. Silica is blended in an amount of 40% to 60%, preferably 45% to 55%, based on the total solid content weight of the additive. Alumina is blended in an amount of 30% to 55%, preferably 35% to 50%, based on the total solid content weight of the additive. Divalent iron, silica, and alumina are blended so as to be 100% by weight in total with respect to the total solid content weight in the additive.

Another example of the additive to the radiant heat insulating refractory paint of the present embodiment is porous silicic acid ceramics. Usually, 200 g to 400 g, preferably 300 g of this additive is well stirred with the same amount of water, and added to a can containing 10 kg of a radiant heat insulating refractory paint stock solution for use. When painting on the floor, pavement, parking lot, etc. as the base material, 500 g to 2,000 g of this additive is used. In this case, it is necessary to paint in a short time because the paint cures quickly. The additive may contain both porous silicate ceramics and ferrous iron.

[Preparation of radiant heat insulating refractory paint]
The radiant heat insulating refractory paint of this embodiment can be prepared as follows. That is, hollow particles, an organic binder, an inorganic binder containing scaly silica, an infrared reflective powder, and a modified silicone are mixed in the above range. For example, 10 kg of a resin emulsion (for example, 5.8 kg as a solid content weight), 1 kg of water slurry-like scaly silica (for example, 0.15 kg as a solid content weight), and 0.5 kg of hollow particles are mixed. The resin emulsion contains a modified silicone, an organic binder, an inorganic binder, and other fillers. Color pigments and the like are added to this mixture, if necessary. Further, an aqueous medium or solvent for dilution is added, and the mixture is sufficiently mixed using a mixer such as a ball mill, a sand mill, a paint shaker, a jet mill, a kneader, and a triple roll. As the aqueous medium, for example, water can be used. If necessary, water-soluble organic solvents such as methanol, isopropanol, methyl cellosolve, and butyl cellosolve are added.

[ Preparation of additives]
Silica (40% to 60%, preferably 45% to 55% based on the total solid weight of the additive), alumina (30% to 55%, preferably 35% to the total solid weight of the additive) 50%) and ferrous ferrous (eg, ferrous sulfate) (3% to 15%, preferably 5% to 10%, based on the total solid weight of the additive) in an appropriate amount of water (eg, equal amount). Mix well with water) to prepare .

[Applying radiant heat insulating and refractory paint to the base material]
The application of the radiant heat insulating refractory paint to the base material is performed as follows.
(1) Add 3% to 5% of the total solid content weight to the can containing 10 kg of the radiant heat insulating refractory paint stock solution. If necessary, add water little by little to adjust the viscosity. (However, be careful not to add too much water.) (When using an additive containing porous silicate ceramics as a component, for example, 300 g of porous silicate ceramics is added to an appropriate amount of water (for example, the same amount). Add a mixture well with water).)
(2) The prepared liquid and the radiant heat insulating and fireproof paint are well stirred, and the mixed liquid is applied to the base material using a roller, a brush, or a gun blower as a painting tool. It may be applied in a single coat, or may be applied in a plurality of coats of 2 to 3 times or more, but it is preferably applied in a plurality of coats. In the case of 10 kg, the coating area is 70 m ² (1 time) or 35 m ² (2 times) on a smooth surface. When coated 2-3 times, the film thickness is 0.14 to 0.28 mm. In the radiant heat insulating refractory paint of the present embodiment, it is preferable to apply the paint to a film thickness of about 0.25 mm. As described above, the coating film thus obtained has a low content of a resin component as an organic binder, and is mainly a special silica component (for example, scaly silica) or a special inorganic material having high heat insulating properties (for example). , Hollow particles) is an inorganic mixed coating film. The global hemispherical emissivity, which is an index of the thermal radiation performance of the coating film, is 0.84 (84%) or less even if a similar paint containing no scaly silica is applied multiple times, whereas the radiation of the present embodiment In heat insulating and fire resistant paints, 0.85 to 1.00 (85 to 100%), 0.88 to 1.00 (88 to 100%), 0.91 to 1.00 (91 to 100%), or 0. It shows .92 to 1.00 (92 to 100%).

The radiation-insulated refractory paint of the present embodiment has excellent heat radiation performance. The coating film formed by applying the paint receives the heat spectrum of sunlight, stores heat, and the temperature gradually rises. However, the larger the value of the global hemispherical emissivity and the closer it is to 1.0, the greater the effect of quickly releasing the heat into the air and keeping the coating film temperature low. The radiation-insulated fire-resistant coating material of the present embodiment has a total hemispherical emissivity close to 1.0 by increasing the content of the inorganic binder containing scaly silica while reducing the content of the organic binder (resin). Has excellent heat radiation performance. On the other hand, ordinary heat-insulating refractory paints have a low total hemispherical emissivity of around 0.8, and cannot be said to have good thermal radiation performance. If anything, these exhibit the performance of keeping the coating film temperature low by heat shielding. The heat shield performance is the ability to prevent the coating film from becoming hot due to the reflection of the heat spectrum of sunlight (near infrared reflectance). As for the heat-shielding performance, when the coating film becomes dirty, the reflectance decreases, which causes a problem in the sustainability of the effect. However, as in the case of the radiation-insulated refractory paint of the present embodiment, if the heat emissivity is large, even if the coating film becomes dirty, the sustainability of the effect that the coating film does not easily become hot does not decrease.

Further, the radiant heat insulating refractory paint of the present embodiment has excellent heat insulating performance by blending hollow particles and an inorganic binder containing at least scaly silica. This is because the coating film mixed with the special inorganic binder has a low thermal conductivity and has a heat insulating effect and a heat retaining effect. For example, when maintaining a high temperature or a low temperature in a high-temperature pipe or a low-temperature pipe in a factory, the temperature in the pipe can be maintained by coating the base material. Further, it is possible to reduce the high temperature of the base material by coating it on a base material having a high surface temperature such as around a machine.

Further, the radiant heat insulating fireproof coating material of the present embodiment has excellent fire resistance performance because it contains scaly silica at a high content. This is because the scaly silica exerts a function of preventing the mixed organic binder from burning only by carbonizing. Due to its strong self-forming property, scaly silica can maintain the strength of the coating film even at the stage where the synthetic resin, which is an organic binder contained in the coating film, is melted and decomposed by a flame, and the stage where a carbide layer is formed. .. Moreover, since the scaly silica itself is composed of silica (totally referred to as silicon oxide, silicon hydroxide-containing, polysilicic acid, and polysilicate), it has an extremely high melting point, high heat resistance, and is coated. It is possible to effectively prevent the film from peeling off or falling off from the base material. That is, by blending scaly silica, it is possible to prevent a part of the coating film from peeling off and falling off and losing the heat insulating effect of that part.

Further, the radiant heat insulating refractory paint of the present embodiment is imparted with thixotropic property because it contains scaly silica. As a result, in the fluid state, the viscosity is lowered, so that the coating can be applied thinly and uniformly. The applied paint is less likely to drip. As described above, scaly silica is very suitable as an inorganic binder because it can impart thixotropic properties to the refractory paint and can easily form a uniform coating film.

Further, in general water-soluble paints, measures are taken to increase the organic binder content to 40 to 50% or to mix an organic solvent as a measure against water. However, when the amount of the organic binder is large, the amount of heat stored in the coating film is large, so that there is a problem that the heat radiation performance is deteriorated. On the other hand, if the content of the organic binder is reduced, the water resistance becomes difficult, and there is a problem that the paint flows due to rain, and cracks and swelling occur when the coating is thickly applied. This also applies when scaly silica is blended as an inorganic binder. Therefore, in the radiant heat insulating refractory paint of the present embodiment, as described above, an additive is added as a coating film curing / strengthening agent immediately before coating.

In the radiant heat insulating refractory coating material of the present embodiment, as described above, for example, an additive containing silica, alumina, and ferrous iron as components is used as an example of the additive. When an additive containing this additive as a component is added before coating by 3% to 5% of the total solid content weight, the heat insulating property is maintained, and the water resistance, crack prevention, and drying property are improved. In addition, when no additive is added, ^{only 30 m 2} can be applied at 10 kg, but when an additive containing silica, alumina, and ferrous iron is added, the coating area is ^{extended to 40 m 2} at 10 kg, and heat insulation is achieved. The effect can also be improved. In addition, it is possible to deal with places where hardness followability is required, such as parking lots, by adding this additive.

In the radiant heat insulating refractory paint of the present embodiment, as described above, porous silicic acid ceramics are used as another example of the additive. Porous silicate ceramics form a tough coating film and form a water-resistant and hard coating film. Further, this radiant heat insulating refractory coating film has flexibility (elasticity) even if it is hard. Therefore, there is no need to worry about cracks or cracks. When using porous silicate ceramics, it can be used for various purposes such as roofs / walls, road surfaces, parking lots, etc. by simply changing the mixing ratio of porous silicate ceramics with one type of paint. For example, by increasing the amount of the porous silicate ceramics added, a water-resistant and durable coating film is formed. Painting on the floor, parking lot, and pavement By painting the floor, the ambient temperature can be lowered. Specifically, for example, by painting the pet shed and its surroundings, it can be useful for pet health management.

Further, in the radiant heat insulating refractory paint of the present embodiment, a special ceramic pigment can be used as the coloring pigment. In that case, since most of the coating film is a special inorganic mixture, it has excellent heat shielding properties and durability. The special inorganic mixed coating film reflects the solar thermal spectrum (infrared rays) well. The near-infrared reflectance of the coating film is 90% or more, and specifically, for example, 91.87% (white).

Further, the radiant heat insulating and fireproof paint of the present embodiment brings about an improvement in the amount of power generation by coating the back surface of the solar solar panel (silicon single crystal type panel) and the panel installation base material (roof / floor). The maximum output of solar solar panels is usually measured at a temperature of 25 ° C, but in Japan, the climate to which this value applies is very rare, and especially the temperature from the end of May to November is an abnormally high temperature around the roof and ground (about). The temperature is 40 ° C to 70 ° C), which causes a decrease in power generation capacity (10% to 20%). By applying the radiant heat insulating and fireproof paint of the present embodiment, the temperature of the solar solar panel can be lowered, and as a result, the power generation capacity can be improved.

Further, the coating film of the radiant heat insulating refractory paint of the present embodiment has an antistatic effect of suppressing the generation of static electricity, so that it is very difficult to get dirty. In addition, since this coating film is hydrophilic and does not form water droplets, dew condensation is prevented. Furthermore, since the coating film mixed with a special inorganic substance has sound absorbing properties, it exhibits soundproofing and soundproofing effects.

Further, since the radiant heat insulating refractory paint of the present embodiment has excellent adhesion to various existing coating films, it can be suitably used for repair and refurbishment. Further, the viscosity of the radiant heat insulating refractory paint of the present embodiment can be adjusted by the amount of the additive (coating film curing / strengthening agent). Therefore, the surface shape of the coating film can be formed into various shapes. As the surface shape, for example, it can be formed into a smooth shape, a citron skin shape, a spray tile shape, a stencil shape, or the like.

The present invention is not limited to the contents of the above-described embodiments. The specific configuration of the radiant heat insulating refractory coating material according to the present invention can be changed in various ways. Similarly, the specific configuration of the combination of the radiant heat-insulating refractory paint according to the present invention and the additive added to the radiant heat-insulating fire-resistant paint can be variously redesigned.

Hereinafter, embodiments of the present invention will be described in more detail based on Examples and Comparative Examples. The present invention is not limited to these examples.

[Preparation of radiant heat insulating refractory paint]
To a can containing 10 kg of acrylic emulsion (solid content weight 5.8 kg) as an organic binder, 1 kg of water slurry-like scaly silica (solid content weight 0.15 kg) and 0.5 kg of hollow particles were added. In addition to 0.5 kg of acrylic resin, 1.7 kg of modified silicone and 3.6 kg of fillers such as titanium oxide, mica, and aluminum hydroxide are blended in the acrylic emulsion. Further, water was added and sufficiently mixed using a mixer to prepare a radiation-insulating fire-resistant paint. This radiant heat insulating refractory paint was appropriately colored white or Nikko color chart number C-75-60B (gray color).

[ Preparation of additives]
Additives containing silica, alumina, and ferrous iron as components were prepared . That is, 180 g of silica (41.9% based on the total solid weight of the additive), 200 g of alumina (46.5% of the total solid weight of the additive), and 50 g of ferrous sulfate (of the additive). 11.6% by weight of total solids) was mixed well with the same amount of water. (When using an additive containing porous silicate ceramics as a component, 300 g of porous silicate ceramics is well mixed with the same amount of water.)

[Applying radiant heat insulating and refractory paint to the base material]
(1) Add an additive containing silica, alumina, and ferrous iron (total solid content weight 400 g) to the can containing the radiation-insulated refractory paint stock solution (total solid content weight 10 kg) prepared above, and often Stirring was performed to prepare a coating solution. Water was added little by little to adjust the viscosity.
(2) This coating liquid was well stirred and applied to the base material using a roller as a coating tool. As a base material, a galvalume steel plate (registered trademark) (150 (length) x 150 (width) x 0.5 (thickness) mm) was used.

[Preparation of coating material of Comparative Example
A comparative paint was prepared for comparison with the examples. A paint in which the amount of acrylic emulsion was increased (the amount of increase was 0.15 kg as the solid content weight) without blending scaly silica was used as a comparative example with respect to the radiant heat insulating refractory paint of the example. In addition, no additives were used during coating. This preparation was stirred well and applied to the substrate using a roller as a coating tool as in the examples.

[Characteristics of coating film]
Since the coating film of the example uses an additive, improvement in film strength, improvement in water resistance, reduction in crack occurrence rate, and reduction in swelling occurrence rate were observed as compared with the comparative example.

[Whole hemispherical emissivity characteristics]
FIG. 1 shows the measurement result of the global hemispherical emissivity by the portable global hemispherical emissivity measuring device. The coating films of Examples and Comparative Examples were all white. The measurement was performed using a portable hemispherical emissivity measuring device PM-E2 (manufactured by Systems Engineering Co., Ltd.). In the radiation-insulated refractory paint of the example, the global hemispherical emissivity showed an average of 0.88 for two coats and 0.91 for three coats. At the time of two coats, the average was 0.85 or more. The film thickness was about 0.25 mm at the time of three coatings. The total hemispherical emissivity of the comparative example was 0.84 on average even after four coatings (about 0.25 mm thickness), which was smaller than that of the example. As for the total hemispherical emissivity, the larger the value, the larger the heat dissipation performance. Therefore, from the table shown in FIG. 1, since the coating film of the radiation-insulated fire-resistant paint of the example has high heat radiation performance, the coating film is warmed in the solar heat spectrum as compared with the coating film of the paint of the comparative example. It was confirmed that there was a lot of heat dissipation and it was hard to get hot.

[Temperature change on the coating film surface]
FIG. 2 is a graph showing the results of irradiating the surface of the coating film with light of 40 W white spheres and measuring the temperature change of the surface of the coating film with the passage of time. As the coating film of the example, the above-mentioned galvalume steel plate (registered trademark) coated with a radiant heat insulating refractory paint three times was used. As a comparative example, the one coated four times was also used. Both coatings were white in color. The blank indicates the change in the measured value of the surface temperature of the galvalume steel plate (registered trademark). As shown in FIG. 2, the comparative example showed a lower surface temperature than the blank at any elapsed time. This seems to be due to the heat-shielding performance of the paint of the comparative example. In addition, the coated surface of the example showed a lower temperature than the blank and the comparative example at any elapsed time. This indicates that the coating film of the example is maintained in a colder state than the blank or the comparative example due to the improvement of the heat radiation performance by containing the scaly silica in addition to the heat shielding performance.

[Measurement result of face-to-face temperature]
FIG. 3A shows the results of irradiating the white-colored coating film with light of 40 W white spheres and measuring the change in the face-to-face temperature (temperature on the unpainted side) with the passage of time. As the coating film of the example, a galvalume steel plate (registered trademark) having the above size was coated with a radiant heat insulating refractory paint three times. As a comparative example, the one coated four times was also used. As shown in FIG. 3A, the coating film of the radiant heat insulating refractory paint of the example showed a lower face-to-face temperature than the paint of the comparative example at any elapsed time.

FIG. 3B shows a change in the face-to-face temperature with the passage of time by irradiating a coating film colored with Nikko color chart number C-75-60B (gray color) instead of white with light of 40 W white spheres. The measurement result is shown. As the coating film of the example, as in the test shown in FIG. 3A, a galvalume steel plate (registered trademark) having the above size was coated with a radiant heat insulating refractory paint three times. As a comparative example, the one coated four times was also used. As shown in FIG. 3 (B), the radiant heat insulating refractory paint of the example showed a lower face-to-face temperature than the paint of the comparative example at any elapsed time, and the difference was larger than that when colored white. became.

Comparing the results shown in FIG. 3 (A) with the results shown in FIG. 3 (B), in the comparative example, the increase in the facing temperature of the colored coating film was much larger than that of the white coating film. .. On the other hand, in the examples, the increase in the facing temperature of the colored coating film was only slightly larger than that of the white coating film.

From the above, since the coating film of the example has higher heat radiation performance than that of the comparative example, even if the surface of the coating film which was white becomes dirty and the ability to reflect the solar heat spectrum (infrared ray) is reduced, the heat insulating performance is maintained. I was able to confirm that it could be maintained.

[Energy saving effect]
FIGS. 4 (A) and 4 (B) show the rooftop outside air temperature, the attic temperature, and the indoor temperature with the passage of time when the radiant heat insulating fireproof paint of the example is applied to the roof of the building (ceiling area of about 600 m ^2). The relationship of temperature changes is shown. FIG. 4 (A) shows the temperature change before painting, and FIG. 4 (B) shows the temperature change after painting. It can be seen that the attic temperature drops particularly significantly after painting. Before painting, the cooler was put into operation by employees around 7:30 AM. At this time, the room temperature had already reached about 28.5 ° C. At 7:30 AM after painting, the room temperature was about 25.5 ° C, and the operation of the cooler started around 9:30 AM. Before painting, the cooler was stopped at around 6:30 PM, and the room temperature has risen sharply since then. Since the outside air temperature is about 28 ° C., it can be seen that the radiant heat of about 38.4 ° C. from the attic raises the indoor temperature. On the other hand, after painting, the attic temperature becomes very low, so the room temperature is stable. As described above, it was confirmed that the radiant heat from the attic is the main cause of the soaring cooling cost, and that a considerable energy saving effect can be exhibited only by applying the radiant heat insulating refractory paint of this example. For example, the energy saving effect after painting in July-October was about 37,370 KWh (reduced air-conditioning electricity usage), and the CO ₂ reduction amount was about 14 tons.

Claims (7)

It is a combination of a radiant heat-insulating fire-resistant paint with improved thermal radiation performance of the coating film and an additive added to the radiant heat-insulating fire-resistant paint.
The radiant heat insulating refractory paint is
Hollow particles and
With an organic binder
Inorganic binder, including
The hollow particles are formed of an inorganic material and are formed from an inorganic material.
The organic binder is formulated as an aqueous emulsion and
As the inorganic binder, at least scaly silica is blended,
The scaly silica improves the thermal radiation performance of the coating film .
The additive is a combination containing ferrous iron . The combination according to claim 1.
The scaly silica is the total hemispherical emissivity showing the heat radiation performance is formulated to be 0.85 to 1.00, in combination. The combination according to claim 1 or 2.
The divalent iron is a combination that is blended as a divalent iron salt. The combination according to claim 3 , wherein the divalent iron salt is ferrous sulfate. The combination according to any one of claims 1 to 4.
Before SL additive further comprises silica and / or alumina, in combination. The combination according to any one of claims 1 to 5.
The additive is a combination that is added to the radiant heat insulating refractory paint at the time of use. A coating method for coating a substrate using the combination according to any one of claims 1 to 6.
A coating liquid preparation step of adding the additive to the radiant heat insulating refractory paint to prepare a coating liquid, and
A coating method comprising a coating step of applying the coating liquid prepared in the coating liquid preparation step to the base material.

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