JP6967220B2 - Thermal insulation coating composition and thermal insulation coating - Google Patents

Description

The present invention relates to a coating composition having both a heat insulating function and a heat shielding function. In particular, by using biological nanofibers having a high aspect ratio as a constituent component, the present invention has an excellent heat insulating function and shielding function for forming a coating film in which coating film cracking is unlikely to occur. The present invention relates to a coating composition having a thermal function and a heat insulating and heat insulating coating material containing the coating composition.

In recent years, there has been increasing interest in energy saving, and as an effective preventive measure for the heat island phenomenon, which has become a problem especially in urban areas, paints with heat insulating properties and heat insulating properties on the exterior surfaces such as roofs and outer walls of buildings. It is considered to form a coating film having heat insulating properties and heat insulating properties by coating the above, and to suppress an increase in room temperature. Here, the heat insulating property means a property of reducing heat transfer due to conduction, convection and radiation, and the heat insulating property means a property of blocking the inflow of heat from the outside due to radiation by reflecting solar radiation.
The heat insulating paint is a paint containing a component having a function of suppressing heat conduction. As a constituent component having a function of suppressing heat conduction, a paint in which hollow particles having an air layer inside are dispersed and blended in a synthetic resin emulsion is disclosed (Patent Documents 1 and 2).
The heat-shielding paint is a paint containing a component having a function of effectively reflecting an infrared region, particularly a near-infrared region (wavelength: 780 nm to 2500 nm) and suppressing a temperature rise due to radiation. As a component having a function of suppressing a temperature rise due to radiation, a paint dispersed and blended in a synthetic resin emulsion to which a coloring content such as titanium oxide, silica, or iron oxide is added is disclosed (Patent Documents 3 and 4).
Further, a paint having both a heat insulating function and a heat shielding function by covering the surface of particles having a hollow portion with an infrared reflective powder is also disclosed (Patent Document 5).

On the other hand, since there is little risk of environmental consideration and resource depletion, cellulose nanofibers (CNF) and chitin nanofibers (ChNF) should be obtained from biological materials (biomass) such as cellulose and chitin and used. Is also being actively researched. Further, in building materials, it is known that wood (sugi, hinoki) has a lower thermal conductivity than inorganic materials such as glass, plaster, and gypsum.
However, neither a heat insulating paint containing cellulose nanofibers (CNF) or chitin nanofibers (ChNF) as a component having a heat insulating function and a heat insulating paint containing a heat insulating function as a component is not disclosed.

Japanese Patent Application Laid-Open No. 2002-105385 Japanese Unexamined Patent Publication No. 2009-108222 Japanese Unexamined Patent Publication No. 2002-02825 Japanese Unexamined Patent Publication No. 2015-124360 Japanese Unexamined Patent Publication No. 2014-233844

Further, the heat insulating paint and the heat insulating paint disclosed in Patent Documents 1 to 5 are composed of a component having a function of suppressing heat conduction and a component having a function of suppressing a temperature rise due to radiation in order to improve heat insulating property and heat shielding property. Since the ratio is high and the interaction with the synthetic emulsion resin as the main agent is weak, there is a problem that the adhesion of the coating film is lowered and the coating film becomes fragile, so that the coating film is cracked.

As a result of diligent research in view of the above problems, the present inventors have made biological nanofibers obtained from biological materials (biomass) such as cellulose and chitin, which are environmentally friendly and have less risk of resource depletion. It was found that cellulose nanofibers (CNF) and chitin nanofibers (ChNF) are excellent in heat insulating properties and heat insulating properties.
By blending biological nanofibers with known components that have the function of suppressing heat conduction and known components that have the function of suppressing heat conduction due to radiation, the coating film has excellent adhesion and high coating film strength. We were able to propose a paint that has both a heat insulating function and a heat shielding function, which is less likely to cause cracks in the film, and was able to solve the above problems.
Specifically, it can be solved by the following aspects.

(Aspect 1) A coating composition composed of biological nanofibers and having a heat insulating function.
Bio-derived nanofibers have a high affinity with water and therefore have excellent water dispersibility, and because of their high aspect ratio, the nanofibers fold to form a network structure, making it easy to form a coating film containing nano-level voids. Because there is. Due to this property, the coating film formed only of cellulose nanofibers (CNF) and chitin nanofibers (CNF) has a thermal conductivity (W / m · k) of 0.128 for CNF and 0.107 for ChNF. , 0.109, which is an excellent heat insulating property.

(Aspect 2) A coating composition having a heat insulating function, which comprises a swellable layered inorganic compound, biological nanofibers, and a heat insulating hollow structure filler.
By swelling the swellable layered inorganic compound with a solvent (particularly water), it is possible to form an inlaid structure with biological nanofibers having a high affinity for water, and the strength and flexibility of the coating film can be improved. This is because that. Furthermore, due to the heat insulating function of the nanolevel voids derived from the network structure of the above-mentioned biological nanofibers, the content of the heat insulating hollow structure filler, which is a component having a function of suppressing heat conduction, can be suppressed, and the coating film adhesion can be suppressed. This is because it is possible to form a coating film having excellent coating film strength and high coating film strength.

(Aspect 3) A coating composition having a heat-shielding function, which comprises a swellable layered inorganic compound, biological nanofibers, and a heat-shielding inorganic powder.
By swelling the swellable layered inorganic compound with a solvent (particularly water), it is possible to form an inlaid structure with biological nanofibers having a high affinity for water, and the strength and flexibility of the coating film can be improved. This is because that. Furthermore, the above-mentioned biological nanofibers form an inset structure with the swellable layered inorganic compound, thereby expanding the layers of the swellable layered inorganic compound and increasing the reflection of infrared rays and the like to suppress the temperature rise due to radiation. The heat shield function can suppress the content of inorganic powder such as titanium oxide, which is a component that has the function of suppressing the temperature rise due to radiation, and has excellent coating adhesion and high coating strength. This is because cracks are less likely to occur.

(Aspect 4) A heat-insulating heat-shielding paint containing a resin component, a swellable layered inorganic compound, biological nanofibers, a heat-insulating hollow structure filler, and a heat-shielding inorganic powder as main components , wherein the swelling layered inorganic compound is used. It is a montmorillonite selected from smectite group clay minerals, and the compounding ratios of the montmorillonite and the biological nanofibers to 100 parts by weight of the resin component are 30 parts by weight to 200 parts by weight and 30 parts by weight to 150 parts by weight, respectively. It is a heat-insulating and heat-shielding paint characterized by being present.
By dispersing the above-mentioned heat-insulating coating composition having a heat-insulating function and the heat-shielding coating composition having a heat-shielding function in a resin component, a heat-insulating heat-shielding paint having both a heat-insulating function and a heat-shielding function can be obtained. Because it can be done. A coating composition having a heat-shielding function, which comprises a swellable layered inorganic compound, biological nanofibers, and a heat-shielding inorganic powder.

By blending a known component that has a function of suppressing heat conduction and a known component that has a function of suppressing temperature rise due to radiation into bio-derived nanofibers that have both a heat insulating function and a heat shielding function, it has excellent coating film adhesion and is coated. It is possible to provide a coating film having both a heat insulating function and a heat shielding function, which has high film strength and is less likely to cause cracks in the coating film.

The embodiments for carrying out the present invention will be described below. However, the present invention is not limited to the described embodiment.

The first embodiment of the present invention is a coating composition having a heat insulating function made of biological nanofibers. Biological nanofibers will be described below.

1. 1. Bio-derived nanofibers In recent years, nanotechnology has been attracting attention for the purpose of refining substances to the nanometer level and obtaining new physical properties that are different from the conventional properties of substances. Nanofibers are fibers having a diameter of 1 to 100 nm and a length of 100 times or more the diameter, and have excellent properties as compared with conventional fibers. Specifically, it has a large specific surface area, excellent adsorption performance, adhesive strength, and molecular recognition, which is an ultra-specific surface area characteristic. Since the fiber diameter is smaller than the light wavelength of 400 to 700 nm, it has less diffuse reflection and excellent transparency. It is a molecular arrangement characteristic that it has excellent strength due to its high molecular orientation. In particular, attention is paid to bio-nanofibers obtained from biological materials (biomass) such as cellulose and chitin, which are environmentally friendly and have less risk of resource depletion, specifically, cellulose nanofibers (CNF) and chitin nanofibers (ChNF). Has been done. The present invention focuses on the heat insulating properties of bio-nanofibers, that is, cellulose nanofibers (CNF) and chitin nanofibers (ChNF), and has heat insulating and heat insulating functions. It is a heat-insulating and heat-shielding paint containing. This will be described below.

(1-1) Cellulose Nanofiber (CNF)
The cellulose nanofibers (CNF) constituting the coating composition of the present invention and the heat insulating and heat-shielding paint can be obtained by defibrating a cellulosic raw material such as pulp fiber by mechanical treatment. When cellulose nanofibers are produced only by mechanical treatment, a large number of mechanical treatments are required, and energy consumption becomes very large. Therefore, a method of performing an oxidation treatment, an esterification treatment, or the like before the mechanical treatment is being studied. Among them, a method for oxidizing pulp using 2,2,6,6-tetramethyl-1-piperidin-N-oxyradical (TEMPO) and sodium hypochlorite (Japanese Patent Laid-Open No. 2008-1728, JP. (See 2010-235679) has been adopted as being able to effectively reduce the mechanical processing of the post-process.
Since cellulose nanofibers (CNF) are excellent in strength, elasticity, thermal stability, etc., they are used as a filter medium, a filter aid, a base material for an ion exchanger, a filler for a chromatographic analysis device, and a filler for blending resin and rubber. It is used for industrial purposes such as agents. It is also used as a compounding agent for cosmetics such as lipsticks, powdered cosmetics, and emulsified cosmetics. Furthermore, because it has excellent water-based dispersibility, it is a viscosity preservative for foods, cosmetics, paints, etc., a toughener for food raw material dough, a water preservative, a food stabilizer, a low-calorie additive, an emulsification stabilization aid, etc. It is expected to be used in many applications.
However, the application focusing on the heat insulating property is not disclosed.

(1-2) Chitin Nanofiber (ChNF)
The chitin nanofiber (ChNF) constituting the coating composition of the present invention and the heat insulating and heat insulating coating material is a chitin (biological material) contained in an extremely large number of organisms including shrimp, crab, insects, shellfish, and mushrooms. ) Is used as a raw material and can be obtained by defibrating by mechanical treatment. Here, chitin is an aminopolysaccharide having a fibrous structure in which N-acetyl-D-glucosamine is linked long (hundreds to thousands) in a chain.
The form of the biological chitin may be any form such as fibrous or granular. It is collected and processed from crustaceans, insects or krill shells and hulls. In the present invention, chitosan obtained by treating chitin with an alkali to remove an acetyl group can be used.
In the method for producing chitin nanofibers, (a) a material derived from a chitin-containing organism that has been deproteinized and decalcified, and (b) a chitin-containing organism that has been deproteinized, decalcified, and deacetylated. Biologically-derived materials that have been pretreated for efficient defibration treatment, such as chitin-derived materials, are preferred. In addition, commercially available purified chitin / chitosan that has been pretreated can be used.
For the defibration treatment, mechanical defibration treatment such as a stone mill type grinder, a high-pressure homogenizer, and a freeze crusher is adopted after treating the deproteinized and decalcified chitin nanofibers with a weak acid (pH 3 to 4). ..

As a method for defibrating biological nanofibers, a wet pulverization method in which a dispersion of polysaccharides such as cellulose, chitin, and chitosan is jetted from a pair of nozzles at a high pressure of 70 to 250 MPa and pulverized by colliding with each other. (Refer to JP-A-2005-270891), a high-pressure injection method in which a dispersed fluid of biomass is jetted at a high pressure of 100 to 240 MPa to collide with a hard body for collision and pulverized (see JP-A-2011-506456) is disclosed. ing.

However, in all of the above-mentioned mechanical defibration treatments, the load on the bio-derived nanofibers and the energy loss are large, and the characteristics as nanofibers (ultra-specific surface area characteristics, nanosize characteristics, molecular arrangement characteristics) are always excellent. It was not possible to obtain thin, long, homogeneous nanofibers with low energy and low cost.
Therefore, it is disclosed that the defibration treatment is performed in the presence of microbubbles generated by the rotating liquid flow type microbubble generator (see JP-A-2017-94218). In the swirling flow type microbubble generator, the shearing force due to swirling and the microbubbles act synergistically at the same time due to the swirling inside the gas-liquid generation tank. Therefore, by using the microbubbles generated by the swirling flow microbubble generator for the defibration process, it is efficient at low energy and low cost, and has excellent ultraspecific surface area characteristics, nanosize characteristics, and molecular arrangement characteristics, and is thin. Long, homogeneous bio-nanofibers can be obtained.

A second embodiment of the present invention is a coating composition having a heat insulating function, which comprises a swellable layered inorganic compound and biological nanofibers. The biological nanofibers are as described above. Hereinafter, the swellable layered inorganic compound will be described.

(1-3) Electrospinning Nanofiber The present invention is a nanofiber having a high aspect ratio and capable of forming nano-level voids in a coating film by folding to form a network structure, and the coating film can be formed. If it is easy, it is not limited to bio-derived nanofibers. Specifically, there are nanofibers manufactured by an electrospinning method.
The electrospinning method is a method for producing nanofibers by applying a high voltage of about 20 kV to a nozzle and applying a voltage to a polymer solution sprayed from the nozzle. There is a feature that the selection range of materials is widened. Materials of nanofibers that can be produced by the electrospinning method include natural resource-derived materials (eg, polylactic acid, cellulose, chitosan, silk fibroin, collagen), petroleum resource-derived materials (eg, polyester, nylon, polyvinyl alcohol, polyamide, etc.). There is polyurethane).

2. 2. Swellable layered inorganic compound The swellable layered inorganic compound is an inorganic compound having a structure in which unit crystal layers are laminated and exhibiting a property of swelling or opening by coordinating or absorbing a solvent (particularly water) between the layers. Examples of such inorganic compounds include swellable hydrous silicates, for example, smectite group clay minerals (montmorillonite, biderite, nontronite, saponite, hectrite, soconite, stibuncite, etc.), vermiculite group clay minerals (vermiculite, etc.). , Kaolin-type minerals (halosite, kaolinite, enderite, chlorite, etc.), phyllosilicates (talc, pyrophyllite, mica, margarite, white mica, gold mica, tetrasilic mica, teniolite, etc.), jamon stones Examples include minerals (antigolite, etc.) and chlorite group minerals (chlorite, cookeye, nantit, etc.). These swellable layered inorganic compounds may be natural products or synthetic products. These layered inorganic compounds can be used alone or in combination of two or more.

The swellable layered inorganic compound is preferably micronized from the viewpoint of achieving both adhesion and interaction with biological nanofibers. The swellable layered inorganic compound that has been micronized is usually plate-shaped or flat, and the planar shape is not particularly limited, and may be an indefinite shape or the like. The average particle size (average particle size of the planar shape) of the swellable layered inorganic compound treated to be finely divided is, for example, 0.01 to 5 μm, preferably 0.1 to 3 μm, and more preferably about 0.5 to 2 μm. be.

Among these swollen layered inorganic compounds, smectite group clay minerals, particularly montmorillonite, which is the main component of bentonite, are preferable. This will be described below.
(2-1) Montmorillonite When in contact with water, montmorillonite has swelling properties in which interlayer cations and water molecules hydrate and the distance between unit layers increases. It is considered that the increase in the distance between the unit layers due to this swelling promotes the interlayer embedding of the biological nanofibers and contributes to the interactivity and film forming property of the coating composition. In particular, montmorillonite containing a large amount ^{of Na +} ions as interlayer cations ^{is more preferable because the electrical attraction between the unit layers due to Na +} ions is weak, and when dispersed in water, the distance between the unit layers increases to 4 nm or more.

(2-2) Others In the present invention, a water-soluble polymer can be used as an additive for the swellable layered inorganic compound. Specifically, carboxymethyl cellulose, carboxymethyl cellulose ammonium, sodium carboxymethyl cellulose, polyvinyl alcohol, polyacrylic acid, sodium polyacrylate, and methyl vinyl ether anhydrous maleic acid copolymer can be preferably used.

The solid content concentration of the swellable layered inorganic compound in the coating composition according to the second embodiment of the present invention is 10 to 90 wt%, preferably 10 to 50 wt%, and more preferably 20 to 40 wt%. The solid content concentration of the biological nanofibers is 10 to 90 wt%, preferably 10 to 50 wt%, and more preferably 20 to 40 wt%.

A third embodiment of the present invention is a coating composition having a heat insulating function, which comprises a swellable layered inorganic compound, biological nanofibers, and a heat insulating hollow structure filler. Biological nanofibers and swellable layered inorganic compounds are as described above. Hereinafter, the heat insulating hollow structure filler will be described.

3. 3. Heat-insulating hollow structure filler The heat-insulating hollow structure filler is a component that has infrared reflectivity and imparts heat-insulating properties. By containing the heat-insulating hollow structure filler, it is possible to reflect infrared rays due to sunlight or the like, insulate the outside temperature, etc., and suppress the temperature rise of the coating layer, so that the coating composition swells or peels off. Etc. can be prevented.

Examples of the heat insulating hollow structure filler include hollow ceramic beads and hollow resin beads. Examples of the ceramic components constituting the hollow ceramic beads include sodium silicate glass, non-crystalline silicic acid (silica), spherical silicic acid (spherical silica), aluminum silicic acid glass, sodium borosilicate glass, carbon, alumina, silas, pearlite, and black stone. And so on. Examples of the resin component constituting the hollow resin beads include acrylic resin, styrene resin, acrylic-styrene copolymer resin, acrylic-acrylonitrile copolymer resin, acrylic-styrene-acrylonitrile copolymer resin, and acrylonitrile-methacrylonitrile copolymer resin. Examples thereof include acrylic-acrylonitrile-methacrylonitrile copolymer resin, vinylidene chloride-acrylonitrile copolymer resin and the like. These can be used alone or in combination of two or more.
Examples of the shape of the heat insulating hollow structure filler include a spherical shape, an elliptical spherical shape, and a flat spherical shape.

The heat-insulating hollow structure filler has a hollow structure, and when the structure is focused on, it is classified into open-cell type hollow particles and closed-cell type hollow particles. Of these, in the present invention, closed bubble type hollow particles are suitable. When the closed-cell type hollow particles are used, it is possible to prevent the resin component and the like from entering the bubbles, so that high heat insulating performance can be exhibited. The internal structure of the closed-cell type hollow particles may be a single hollow type having one hollow per particle, or a multi-hollow type having two or more hollows per particle. ..

The hollow portion of the heat insulating hollow structure filler is usually filled with gas, but it is also possible to use one in which the hollow portion is evacuated. Examples of the gas that can be filled in the hollow portion include air, aliphatic hydrocarbons, aromatic hydrocarbons, chlorinated hydrocarbons, fluorinated chlorinated hydrocarbons, and volatile monomers. Of these, air is preferable.

The average particle size of the heat insulating hollow structure filler is usually 0.1 to 200 μm, preferably 1 to 150 μm. When the average particle size is in such a range, a coating film having high smoothness can be formed.

The density of the heat insulating hollow structure filler is usually ^{0.01 to 1 g / cm 3} , preferably 0.01 to 0.5 g / cm ³ . When the density is in such a range, heat insulation, lightness and the like can be improved.

The solid content concentration of the swellable layered inorganic compound in the coating composition according to the third embodiment of the present invention is 10 to 90 wt%, preferably 10 to 50 wt%, and more preferably 20 to 40 wt%. The solid content concentration of the biological nanofibers is 10 to 90 wt%, preferably 10 to 50 wt%, more preferably 20 to 40 wt%, and the solid content concentration of the heat insulating hollow structure filler is 10 to 90 wt%. It is preferably 10 to 50 wt%, more preferably 20 to 40 wt%.

A fourth embodiment of the present invention is a coating composition having a heat-shielding function, which comprises a swellable layered inorganic compound and biological nanofibers. The swellable layered inorganic compound and the bio-derived nanofibers are as described above.

The solid content concentration of the swellable layered inorganic compound in the coating composition according to the fourth embodiment of the present invention is 10 to 90 wt%, preferably 10 to 50 wt%, and more preferably 20 to 40 wt%. The solid content concentration of the biological nanofibers is 10 to 90 wt%, preferably 10 to 50 wt%, and more preferably 20 to 40 wt%.

A fifth embodiment of the present invention is a coating composition having a heat-shielding function, which comprises a swellable layered inorganic compound, biological nanofibers, and a heat-shielding inorganic powder. The swellable layered inorganic compound and the bio-derived nanofibers are as described above. Hereinafter, the heat-shielding inorganic powder will be described.

4. Heat-shielding inorganic powder The heat-shielding inorganic powder in the present invention refers to particles capable of efficiently reflecting near infrared rays (wavelength range 780 to 2500 nm).
Such heat-shielding inorganic powders include, for example, titanium oxide (rutyl type, anatase type) such as JR-1000 (manufactured by Teika Co., Ltd.), CR-97, R-630 (all manufactured by Ishihara Sangyo Co., Ltd.). ), Barium titanate, sodium titanate, silicon oxide, silica (including non-crystalline silica), zinc oxide, cerium oxide, calcium oxide, barium oxide, zirconium oxide, yttrium oxide, indium oxide, magnesium oxide, aluminum oxide, Alumina, dioxane violet (manufactured by Clariant), iron oxide red (manufactured by Bayer), cyanine green (manufactured by Toyo Ink Co., Ltd.), quinacridone violet (manufactured by Clariant), barium carbonate, magnesium carbonate and the like can be mentioned. Among these, titanium oxide, zinc oxide, and zirconium oxide can be suitably used because they can effectively reflect near infrared rays.

In addition to the above, a colored pigment that reflects near infrared rays may be used as the heat-shielding inorganic powder. Examples of such coloring pigments include iron oxide, yellow iron oxide, antimony tin oxide, aluminum flakes, scaly aluminum, cobalt blue, lithopon, lead sulfide, etc .; phthalocyanine-based, anthraquinone-based, quinacridone-based, and azo-based. , Perinone-based, Perylene-based, Indigo / Thioindigo-based, Dioxazine-based, Metin / Azomethine-based, Isodolinone-based, Diketopyrrolopyrrole-based organic pigments; Carbon nanohorns, aluminum hydroxide, iron hydroxide, silicon carbide, boron nitride, silica soil, limestone, gypsum, bentonite, clay, mica, clay minerals, iron, copper, nickel, gold, silver, zinc, ferrite, stainless steel, Chromium oxide, cobalt oxide, zinc green, chrome green, cobalt green, viridian, guinea green, cobalt chrome green, shale green, green soil, manganese green, pigment green, ultramarine, dark blue, pigment green, rock ultramarine, cobalt blue, cerulean Blue, Copper Borate, Molybdenum Blue, Copper Sulfide, Cobalt Purple, Mars Purple, Manganese Purple, Pigment Violet, Lead Hydrooxide, Calcium Lead Acid, Zinquero, Chrome Yellow, Oxide, Cadmium Yellow, Strontium Yellow, Titanium Yellow, Lisage, Pigment Yellow, Copper Oxide, Cadmium Red, Selenium Red, Chrome Vermillion, Bengala, Zinc White, Antimon White, Basic Lead Sulfate, Lead Phosphate, Zircon Oxide, Tungsten White, Lead, Zinc Hua, Bantison White, Phthalic Acid Examples thereof include lead, manganese white, lead sulfate, thermal black, vegetable black, potassium titanate whiskers, molybdenum disulfide and the like. The above-exemplified heat-shielding inorganic powder may be used alone or in combination of two or more.

When used as a heat-shielding paint to be described later, the heat-shielding inorganic powder may be surface-treated from the viewpoint of improving the dispersion stability of the heat-shielding inorganic powder in the paint. A typical example of such a surface treatment is a surface treatment with a silane coupling agent. The silane coupling agent is not particularly limited, and the silane is functionally functional such as a vinyl group, an epoxy group, a styryl group, a methacrylox group, an acryloxy group, an amino group, a ureido group, a chloropropyl group, a mercapto group, an isocyanate group and a sulfide group. Those having a group can be mentioned.

When titanium oxide and a coloring pigment are used in combination as the heat-shielding inorganic powder, the content of the coloring pigment in 100% by mass of the heat-shielding inorganic powder is preferably 10 to 100% by mass, preferably 20 to 95% by mass. Is more preferable, and 30 to 90% by mass is particularly preferable.

The solid content concentration of the swellable layered inorganic compound in the coating composition according to the fourth embodiment of the present invention is 10 to 90 wt%, preferably 10 to 50 wt%, and more preferably 20 to 40 wt%. The solid content concentration of the biological nanofibers is 10 to 90 wt%, preferably 10 to 50 wt%, more preferably 20 to 40 wt%, and the solid content concentration of the heat-shielding inorganic powder is 10 to 90 wt%. It is preferably 10 to 50 wt%, more preferably 20 to 40 wt%.

A fifth embodiment of the present invention is a heat-insulating heat-shielding paint containing a resin component, a swellable layered inorganic compound, biological nanofibers, a heat-insulating hollow structure filler, and a heat-shielding inorganic powder as main components.

5. Resin component The heat-insulating and heat-shielding paint of the present invention is a water-based emulsion paint. In recent years, water-based paints containing water-dispersible resins such as water-soluble resins and emulsions have been used in order to avoid environmental problems caused by the release of volatile organic compounds into the atmosphere. In the coating composition of the present invention, there are no particular restrictions on the resin used, and a suitable resin is selected based on the intended use, required quality, and the like. Preferable examples are water-soluble resins and / or water-dispersible resins, and the types thereof include ethylene resins, vinyl acetate resins, polyester resins, alkyd resins, vinyl chloride resins, epoxy resins, acrylic resins, and acrylic silicone resins. Examples thereof include urethane resin, silicone resin, fluororesin, etc., a mixed system thereof, a modified or copolymerized system, and the like. Hereinafter, the water-soluble resin, the water-dispersible resin, and the dispersant will be described with reference to specific examples, but the present invention is not limited thereto.

(5-1) Water-soluble resin Examples of the water-soluble resin include polyester resin, acrylic resin, and polyurethane resin.
Polyester resins preferably used as water-soluble resins include polyhydric alcohols (eg, ethylene glycol, 1,2-propylene glycol, 1,3-propylene glycol, 1,3-butylene glycol, 1,4-butanediol, 1). , 6-Hexanediol, Diethylene Glycol, Dipropylene Glycol, Neopentyl Glycol, Triethylene Glycol, Hydrogenated Bisphenol A, Glycerin, Trimethylol Ethan, Trimethylol Propane, Pentaerytrit, Dipentaerytrit, etc.) and Polybasic Acids ( For example, phthalic anhydride, isophthalic acid, terephthalic acid, succinic anhydride, adipic acid, azelaic acid, sebacic acid, maleic anhydride, fumaric acid, itaconic acid, trimellitic anhydride, etc.) can be used as a resin raw material.

Acrylic resins preferably used as water-soluble resins include vinyl-based monomers (eg, ethylenically unsaturated carboxylic acids such as acrylic acid, methacrylic acid, itaconic acid, maleic acid, fumaric acid, crotonic acid, acrylic acid or methacrylic acid. Alkyl esters such as methyl, ethyl, propyl, butyl, isobutyl, tertiary butyl, 2-ethylhexyl, lauryl, cyclohexyl, stearyl, 2-hydroxyethyl, 2-hydroxypropyl, 3-hydroxypropyl of acrylic acid or methacrylic acid, Hydroxyalkyl esters such as polyethylene glycol with a molecular weight of 1000 or less, acrylic acid or methacrylic acid amides or alkyl ethers thereof, for example, acrylamide, methacrylic amide, N-methylol acrylamide, diacetone acrylamide, diacetone methacrylic acid, N. Using −methoxymethylacrylamide, N-methoxymethylmethacrylicamide, N-butoxymethylacrylamide, etc. as a resin raw material, organic peroxides (for example, acyl peroxides (for example, benzoyl peroxide), alkyl hydroperoxides (for example). , T-butylhydroperoxide, p-methanehydroperoxide), dialkyl peroxides (eg, di-t-butyl peroxide), etc.) can be easily obtained by a known solution polymerization method or the like as an initiator. Can be done.

Polyurethane resins preferably used as water-soluble resins include polyols (eg, polyester polyols, polyether polyols, acrylic polyols, etc.) and polyisocyanates (eg, phenylenedi isocyanate, tolylene diisocyanate, xylylene diisocyanate, bisphenylenedi isocyanate, naphthylene diisocyanate). Isocyanate, diphenylmethane diisocyanate, isophorone diisocyanate, cyclopentylene diisocyanate, cyclohexylene diisocyanate, methylcyclohexylene diisocyanate, dicyclohexylmethane diisocyanate, trimethylene diisocyanate, tetramethylene diisocyanate, pentamethylene diisocyanate, hexamethylene diisocyanate, propylene diisocyanate, ethylethylene diisocyanate, It can be easily obtained by addition polymerization using trimethylhexane diisocyanate or the like as a raw material.

(5-2) Water-dispersible resin As the water-dispersible resin, there is a styrene-acrylic resin. A styrene monomer and an aromatic or non-aromatic acrylic monomer are synthesized by emulsion polymerization alone or by emulsion polymerization of two or more kinds.
The styrene-based monomer means a monomer having a styrene skeleton. Examples of the styrene-based monomer include styrene, α-methylstyrene, p-methylstyrene, tert-butylstyrene, chlorostyrene, vinyltoluene and the like, but the present invention is limited to these examples only. is not it. These monomers may be used alone or in combination of two or more. The styrene-based monomer has an alkyl group such as a methyl group and a tert-butyl group, a functional group such as a nitro group, a nitrile group, an alkoxyl group, an acyl group, a sulfone group, a hydroxyl group and a halogen atom in the benzene ring. You may. Among the styrene-based monomers, styrene is preferable from the viewpoint of enhancing the weather resistance of the coating film.

Examples of the aromatic acrylic monomer include aralkyl (meth) acrylate and the like. Examples of the aralkyl (meth) acrylate include benzyl (meth) acrylate, phenylethyl (meth) acrylate, methylbenzyl (meth) acrylate, and naphthylmethyl (meth) acrylate, which have an aralkyl group having 7 to 18 carbon atoms. Examples include (meth) acrylate. These monomers may be used alone or in combination of two or more.
Specific examples of acrylic monomers other than aromatic monomers include alkyl (meth) acrylates, hydroxyl group-containing (meth) acrylates, carboxyl group-containing monomers, carbonyl group-containing monomers, and oxo group-containing ones. Examples thereof include a monomer, a fluorine atom-containing monomer, a nitrogen atom-containing monomer, and an epoxy group-containing monomer. These monomers may be used alone or in combination of two or more.
Examples of the alkyl (meth) acrylate include methyl (meth) acrylate, ethyl (meth) acrylate, n-butyl (meth) acrylate, isobutyl (meth) acrylate, tert-butyl (meth) acrylate, and sec-butyl (meth). Alkyl having 1 to 18 carbon atoms in ester groups such as acrylate, 2-ethylhexyl (meth) acrylate, tridecyl (meth) acrylate, cyclohexyl (meth) acrylate, n-octyl (meth) acrylate, and n-lauryl (meth) acrylate. Examples include (meth) acrylate. These monomers may be used alone or in combination of two or more.

(5-3) Dispersant As the dispersant, a surfactant or a resin-type dispersant can be used. Surfactants are mainly classified into anionic, cationic, nonionic, and amphoteric, and suitable types and blending amounts can be appropriately selected and used according to the required characteristics. A resin-type dispersant is preferable.

The anionic surfactant is not particularly limited, and specifically, a fatty acid salt, a polysulfonate, a polycarboxylate, an alkyl sulfate, an alkylarylsulfonate, an alkylnaphthalenesulfonate, and a dialkyl. Sulfate, dialkyl sulfosuccinate, alkyl phosphate, polyoxyethylene alkyl ether sulfate, polyoxyethylene alkylaryl ether sulfate, naphthalene sulfonate formalin condensate, polyoxyethylene alkyl phosphate sulfonate, glycerol bo Examples thereof include late fatty acid ester and polyoxyethylene glycerol fatty acid ester, and specific examples thereof include sodium dodecylbenzenesulfonate, sodium lauryl sulfate, sodium polyoxyethylene lauryl ether sulfate, polyoxyethylene nonylphenyl ether sulfate, and β-. Examples thereof include sodium salts of naphthalene sulfonic acid formarin condensates.

Cationic activators include alkylamine salts and quaternary ammonium salts, specifically stearylamine acetate, trimethylammonium chloride, trimethyl cowfat ammonium chloride, dimethyldiolylammonium chloride, methyloleyldiethanol chloride, tetramethylammonium. Examples thereof include chloride, laurylpyridinium chloride, laurylpyridinium bromide, laurylpyridinium disulfate, cetylpyridinium bromide, 4-alkylmercaptopyridine, poly (vinylpyridine) -dodecylbromide, dodecylbenzyltriethylammonium chloride and the like. Examples of the amphoteric surfactant include aminocarboxylates and the like.

Examples of the nonionic activator include polyoxyethylene alkyl ether, polyoxyalkylene derivative, polyoxyethylene phenyl ether, sorbitan fatty acid ester, polyoxyethylene sorbitan fatty acid ester, alkylallyl ether, and the like, and specifically, polyoxyethylene. Examples thereof include lauryl ether, sorbitan fatty acid ester, polyoxyethylene octylphenyl ether and the like.

The selection of the surfactant is not limited to one kind, and two or more kinds of surfactants such as anionic surfactant and nonionic surfactant, cationic surfactant and nonionic surfactant are used. It can also be used in combination. At that time, it is preferable that the blending amount is the above-mentioned blending amount for each activator component. It is preferable to use an anionic surfactant and a nonionic surfactant in combination, preferably a polycarboxylic acid salt as the anionic surfactant and polyoxyethylene phenyl ether as the nonionic surfactant.

Specifically, as the resin type dispersant, polyurethane; polycarboxylic acid ester such as polyacrylate; unsaturated polyamide, polycarboxylic acid, polycarboxylic acid (partial) amine salt, polycarboxylic acid ammonium salt, polycarboxylic acid alkylamine salt. , Polysiloxanes, long-chain polyaminoamidophosphates, hydroxyl group-containing polycarboxylic acid esters and their modifications; amides and salts thereof formed by the reaction of poly (lower alkyleneimine) with polyesters having free carboxyl groups. Oil-based dispersants such as (meth) acrylic acid-styrene copolymer, (meth) acrylic acid- (meth) acrylic acid ester copolymer, styrene-maleic acid copolymer, polyvinyl alcohol, polyvinylpyrrolidone and the like. Resins and water-soluble polymer compounds; polyester resins, modified polyacrylate resins, ethylene oxide / propylene oxide addition compounds, phosphate ester resins, etc. are used, and these may be used alone or in admixture of two or more. Yes, but not necessarily limited to these.

6. Blending ratio (a) resin component, (b) swellable layered inorganic compound, (c) biological nanofibers, (d) heat insulating hollow structure filler and (e) heat insulating inorganic material constituting the heat insulating and heat insulating coating material of the present invention. The compounding ratio of the powder is (a) 30 to 200 parts by weight for the swellable layered inorganic compound and 30 to 150 parts by weight for the biological nanofibers when the resin component is 100 parts by weight. , (D) The heat insulating hollow structure filler is 30 to 100 parts by weight, and (e) the heat insulating inorganic powder is 50 to 100 parts by weight.

Hereinafter, the present invention will be described in more detail and concretely with reference to Examples, but the present invention should not be construed as being limited to Examples.
Table 1 summarizes examples (coating compositions containing biological nanofibers as constituents) and comparative examples (coating compositions not containing biological nanofibers as constituents) relating to coating compositions having a heat insulating function. be.
Table 2 summarizes examples (coating compositions containing biological nanofibers as constituents) and comparative examples (coating compositions not containing biological nanofibers as constituents) relating to coating compositions having a heat-shielding function. Is.
Table 3 shows, as an example, a heat-shielding heat-insulating paint having both a heat-insulating function and a heat-shielding function of the present invention, and a comparative example of a commercially available product A (heat-insulating ceramic paint manufactured by Nissin Sangyo Co., Ltd.).

7. Evaluation of heat insulation (7-1) Measurement of thermal conductivity Using the test products obtained in Examples and Comparative Examples, the thermal conductivity was measured by the unsteady thin wire heating method. As a measuring device, a rapid thermal conductivity meter QTM-500 (manufactured by Kyoto Electronics Industry Co., Ltd.) was used. The results are shown in Tables 1 and 3.

8. Heat-shielding evaluation (8-1) Measurement of near-infrared solar reflectance A test product on which a coating film consisting of the constituent components shown in Examples and Comparative Examples was formed was subjected to near-red according to JIS K 5675 (high solar reflectance paint for roofs). The outside solar reflectance was measured. The results are shown in Tables 2 and 3.

(8-2) Measurement of temperature difference between front surface and back surface of coating film For a test product on which a coating film sheet consisting of the constituent components shown in Examples and Comparative Examples is formed, the front surface (coat film sheet front surface) and the back surface (coat film sheet back surface) The temperature difference with was obtained. As for the surface temperature, an infrared lamp was installed at a distance of 30 cm from the surface, and the temperature of 0 min to 120 min after irradiation with the infrared lamp was measured by a temperature sensor installed on the surface. The back surface temperature was measured from 0 min to 120 min after irradiation with an infrared lamp by a temperature sensor installed on the back surface of the coating film sheet. An infrared lamp (infrared light bulb R127E26 100 / 110V-125W manufactured by Asahi Kodenki Co., Ltd.) and a temperature sensor (seat couple thermocouple C080 Chino Co., Ltd.) were used. The results are shown in Table 2.

(8-3) Measurement of the temperature difference between the front and back surfaces of the steel plate coating film This measurement measures the measurement difference between the surface temperature of the coating film-forming metal plate placed on the upper part of the heat insulating box and the internal temperature of the heat insulating box. Yes, the temperature difference between the front and back surfaces of the roof on which the coating film is formed is measured as a model.
Specifically, a test in which an opening on which a metal plate (bonded steel plate 200 mm × 300 mm, thickness 0.8 mm) can be placed is provided on the upper surface of a heat insulating container (length 480 mm × width 430 mm × height 210 mm) formed of foam. The device was used. A test product in which a coating film composed of the constituent components shown in Examples and Comparative Examples was formed on a metal plate (bonded steel plate 200 mm × 300 mm, thickness 0.8 mm) was placed in the opening of the test apparatus.
For the surface temperature (coating surface temperature) of the coating film forming metal plate, an infrared light bulb (eye infrared IR100-110V375WRH manufactured by Iwasaki Electric Co., Ltd.) was installed at a distance of 33 cm from the coating film surface, and a temperature sensor (TP-) was installed on the surface. The temperature was measured from 0 min to 90 min after irradiation with the infrared light bulb (manufactured by 01 YFE).
The internal temperature is 0 min after irradiation with an infrared light bulb (eye infrared IR100-110V375WRH Iwasaki Electric) by a temperature sensor (TP-01 YFE) placed in the center inside the foam container (height 9 cm from the bottom). A temperature of ~ 90 min was measured. The results are shown in Table 3.

9. Film-forming property With respect to the coating film composed of the constituent components shown in Examples and Comparative Examples, the coating film-forming property (the coating film can be formed on the coated surface) and the coating film stability (the dry coating film does not crack) are as follows. It is evaluated from the standard.
○ Both coating film forming property and coating film stability △ There is coating film forming property, but there is no coating film stability × There is no coating film forming property

10. Tensile strength measurement For the coating film consisting of the constituent components shown in Examples and Comparative Examples, the coating film was used as a test piece using JISK7139 dumbbell type test piece type A22, and the tensile speed was used using a material strength tester (5581 Instron). The coating film tensile strength (MPa) was measured at 10 mm / min.

<Example 1-1>
As a biological nanofiber, 350 g of chitin nanofiber (manufactured by SGo-20002 Sugino Machine Limited; 1 wt% solution) was applied onto a glass plate to form a coating film having a thickness of 0.27 mm. Then, the coating film was dried under drying conditions (23 ° C., RH 50%) for 3 days to produce a coating film test product (implemented product 1-1). The thermal conductivity (W / m · K) was 0.107, and the film-forming property was judged as “◯”.

<Example 1-2>
As a biological nanofiber, 350 g of chitin nanofiber (manufactured by Omura Paint Co., Ltd .; 1 wt% solution) was applied and dried under the same conditions as in <Example 1-1>, and a coating film test product (implemented product 1-2) was applied. Was produced. The thermal conductivity (W / m · K) was 0.109, and the film-forming property was judged as “◯”.

<Example 1-3>
As a biological nanofiber, 350 g of cellulose nanofiber (manufactured by WMa-1002 Sugino Machine Limited; 1 wt% solution) was applied and dried under the same conditions as in <Example 1-1>, and a coating film test product (implemented product 1) was applied. -3) was manufactured. The thermal conductivity (W / m · K) was 0.128, and the film-forming property was judged as “◯”.

<Example 1-4>
The following constituents were added to 50 g of water to prepare a dispersion under stirring conditions (3000 rpm, 3 min). The prepared dispersion was coated and dried under the same conditions as in <Example 1-1> to produce a coating film test product (Example product 1-4). The thermal conductivity (W / m · K) was 0.262, the film-forming property was judged as “◯”, and the coating film tensile strength was 23.4 MPa.
Swellable layered inorganic compound Montmorillonite (manufactured by Kunipia F Kunimine Kogyo Co., Ltd.) 3.15 g
Biological nanofibers Chitin nanofibers (SFo-20002 manufactured by Sugino Machine Limited; 1 wt% solution) 35 g
No heat insulating hollow structure filler

<Example 1-5>
The following constituents were added to 50 g of water to prepare a dispersion under stirring conditions (3000 rpm, 3 min). The prepared dispersion was coated and dried under the same conditions as in <Example 1-1> to produce a coating film test product (Example product 1-5). The thermal conductivity (W / m · K) was 0.196, and the film-forming property was judged as “◯”.
Swellable layered inorganic compound Montmorillonite (manufactured by Kunipia F Kunimine Kogyo Co., Ltd.) 2.98 g
Biological Nanofiber Chitin Nanofiber (SFo-20002 manufactured by Sugino Machine Limited; 1 wt% solution) 17.5 g
Insulation hollow structure filler pearlite (Pacific pearlite manufactured by Pacific Material Co., Ltd.) 0.35 g

<Example 1-6>
The following constituents were added to 50 g of water to prepare a dispersion under stirring conditions (3000 rpm, 3 min). The prepared dispersion was coated and dried under the same conditions as in <Example 1-1> to produce a coating film test product (Example 1-6). The thermal conductivity (W / m · K) was 0.114, and the film-forming property was judged as “◯”.
Swellable layered inorganic compound Montmorillonite (manufactured by Kunipia F Kunimine Kogyo Co., Ltd.) 2.8 g
Biological nanofibers Chitin nanofibers (SFo-20002 manufactured by Sugino Machine Limited; 1 wt% solution) 35 g
Insulation hollow structure filler pearlite (Pacific pearlite manufactured by Pacific Material Co., Ltd.) 0.35 g

<Example 1-7>
The following constituents were added to 50 g of water to prepare a dispersion under stirring conditions (3000 rpm, 3 min). The prepared dispersion was coated and dried under the same conditions as in <Example 1-1> to produce a coating film test product (Example 1-7). The thermal conductivity (W / m · K) was 0.120, and the film-forming property was judged as “◯”.
Swellable layered inorganic compound Montmorillonite (manufactured by Kunipia F Kunimine Kogyo Co., Ltd.) 2.8 g
Biological nanofibers Chitin nanofibers (manufactured by Omura Paint Co., Ltd .; 1 wt% solution) 35 g
Insulation hollow structure filler pearlite (Pacific pearlite manufactured by Pacific Material Co., Ltd.) 0.35 g

<Comparative Example 1-1>
The following constituents were added to 50 g of water to prepare a dispersion under stirring conditions (3000 rpm, 3 min). The prepared dispersion was coated and dried under the same conditions as in <Example 1-1> to produce a coating film test product (comparative product 1-1). The thermal conductivity (W / m · K) was 0.269, and the film-forming property was judged as “Δ”.
Swellable layered inorganic compound Montmorillonite (manufactured by Kunipia F Kunimine Kogyo Co., Ltd.) 3.15 g
Biological Nanofiber Non-insulating Hollow Structure Filler Pearlite (Pacific Pearlite, manufactured by Pacific Material Co., Ltd.) 0.35 g

<Comparative Example 1-2>
The following constituents were added to 50 g of water to prepare a dispersion under stirring conditions (3000 rpm, 3 min). The prepared dispersion was coated and dried under the same conditions as in <Example 1-1> to produce a coating film test product (comparative product 1-2). The thermal conductivity (W / m · K) was 0.168, and the film-forming property was judged as “Δ”.
Swellable layered inorganic compound Montmorillonite (manufactured by Kunipia F Kunimine Kogyo Co., Ltd.) 2.8 g
Biological nanofiber non-insulating hollow structure filler Pearlite (Pacific Pearlite, manufactured by Pacific Material Co., Ltd.) 0.7 g

<Comparative Example 1-3>
The following constituents were added to 50 g of water to prepare a dispersion under stirring conditions (3000 rpm, 3 min). The prepared dispersion was coated and dried under the same conditions as in <Example 1-1> to produce a coating film test product (Comparative Product 1-3). The thermal conductivity (W / m · K) was 0.564, the film-forming property was judged as “Δ”, and the film tensile strength was 5.6 MPa.
Swellable layered inorganic compound Montmorillonite (manufactured by Kunipia F Kunimine Kogyo Co., Ltd.) 3.15 g
Biological composition Cellulose powder (38 μm, passed through 400 mesh, manufactured by Wako Pure Chemical Industries, Ltd.) 0.35 g
No heat insulating hollow structure filler

<Comparative Example 1-4>
The following constituents were added to 50 g of water to prepare a dispersion under stirring conditions (3000 rpm, 3 min). The prepared dispersion was coated and dried under the same conditions as in <Example 1-1> to produce a coating film test product (comparative product 1-4). The thermal conductivity (W / m · K) was 0.783, the film-forming property was judged as “Δ”, and the film tensile strength was 6.7 MPa.
Swellable layered inorganic compound Montmorillonite (manufactured by Kunipia F Kunimine Kogyo Co., Ltd.) 3.5 g
Bio-derived nanofibers No heat insulating hollow structure filler No

<Example 2-1>
The following constituents were added to 50 g of water to prepare a dispersion under stirring conditions (3000 rpm, 3 min). The prepared dispersion was coated and dried under the same conditions as in <Example 1-1> to produce a coating film test product (Example product 2-1). The temperature difference between the front and back surfaces (° C.) was 5.8, and the film-forming property was judged as "◯".
Swellable layered inorganic compound Montmorillonite (manufactured by Kunipia F Kunimine Kogyo Co., Ltd.) 3.15 g
Bio-derived nanofibers Cellulose nanofibers (WMa-1002 manufactured by Sugino Machine Limited; 1 wt% solution) 35 g
No heat-shielding inorganic powder

<Example 2-2>
The following constituents were added to 50 g of water to prepare a dispersion under stirring conditions (3000 rpm, 3 min). The prepared dispersion was coated and dried under the same conditions as in <Example 1-1> to produce a coating film test product (Example product 2-2). The temperature difference between the front and back surfaces (° C.) was 5.9, and the film-forming property was judged as "◯".
Swellable layered inorganic compound (manufactured by Kunipia F Kunimine Kogyo Co., Ltd.) 2.8 g
Bio-derived nanofibers Cellulose nanofibers (WMa-1002 manufactured by Sugino Machine Limited; 1 wt% solution) 35 g
Heat-shielding inorganic powder Titanium oxide (R-38L manufactured by Sakai Chemical Industry Co., Ltd.) 0.35 g

<Example 2-3>
The following constituents were added to 50 g of water to prepare a dispersion under stirring conditions (3000 rpm, 3 min). The prepared dispersion was coated and dried under the same conditions as in <Example 1-1> to produce a coating film test product (Example product 2-3). The temperature difference between the front and back surfaces (° C.) was 4.2, and the film-forming property was judged as "◯".
Swellable layered inorganic compound (manufactured by Kunipia F Kunimine Kogyo Co., Ltd.) 2.8 g
Biological nanofibers Chitin nanofibers (SFo-20002 manufactured by Sugino Machine Limited; 1 wt% solution) 35 g
Heat-shielding inorganic powder Titanium oxide (R-38L manufactured by Sakai Chemical Industry Co., Ltd.) 0.35 g

<Example 2-4>
The following constituents were added to 50 g of water to prepare a dispersion under stirring conditions (3000 rpm, 3 min). The prepared dispersion was coated and dried under the same conditions as in <Example 1-1> to produce a coating film test product (Example product 2-4). The temperature difference between the front and back surfaces (° C.) was 4.7, the near-infrared solar reflectance (%) was 82, and the film-forming property was judged to be “◯”.
Swellable layered inorganic compound (manufactured by Kunipia F Kunimine Kogyo Co., Ltd.) 2.1 g
Bio-derived nanofibers Cellulose nanofibers (WMa-1002 manufactured by Sugino Machine Limited; 1 wt% solution) 35 g
Heat-shielding inorganic powder Titanium oxide (R-38L manufactured by Sakai Chemical Industry Co., Ltd.) 1.05 g

<Comparative Example 2-1>
The following constituents were added to 50 g of water to prepare a dispersion under stirring conditions (3000 rpm, 3 min). The prepared dispersion was coated and dried under the same conditions as in <Example 1-1> to produce a coating film test product (comparative product 2-1). The temperature difference between the front and back surfaces (° C.) was 2.2, the near-infrared solar reflectance (%) was 30, and the film-forming property was judged to be "Δ".
Swellable layered inorganic compound (manufactured by Kunipia F Kunimine Kogyo Co., Ltd.) 3.5 g
Biological nanofibers No heat-shielding inorganic powder No

<Comparative Example 2-2>
The following constituents were added to 50 g of water to prepare a dispersion under stirring conditions (3000 rpm, 3 min). The prepared dispersion was coated and dried under the same conditions as in <Example 1-1> to produce a coating film test product (comparative product 2-2). The temperature difference between the front and back surfaces (° C.) was 2.2, the near-infrared solar reflectance (%) was 75, and the film-forming property was judged to be "Δ".
Swellable layered inorganic compound (manufactured by Kunipia F Kunimine Kogyo Co., Ltd.) 3.15 g
Biological nanofibers Heat-shielding inorganic powder Titanium oxide (R-38L manufactured by Sakai Chemical Industry Co., Ltd.) 0.35 g

<Comparative Example 2-3>
The following constituents were added to 50 g of water to prepare a dispersion under stirring conditions (3000 rpm, 3 min). The prepared dispersion was coated and dried under the same conditions as in <Example 1-1> to produce a coating film test product (Comparative Product 2-3). The temperature difference between the front and back surfaces (° C.) was 7.8, and the film-forming property was judged as "Δ".
Swellable layered inorganic compound (manufactured by Kunipia F Kunimine Kogyo Co., Ltd.) 2.8 g
Biological nanofibers Heat-shielding inorganic powder Titanium oxide (R-38L manufactured by Sakai Chemical Industry Co., Ltd.) 0.7 g

<Example 3-1>
(1) Preparation of paint dispersion liquid The following components were added to 100 g of water to prepare a paint dispersion liquid under stirring conditions (3000 rpm, 3 min).
Ac-St water-dispersed resin 55 wt% aqueous solution (manufactured by Boncoat CG DIC) 22 g
Swellable layered inorganic compound (manufactured by Kunipia F Kunimine Kogyo Co., Ltd.) 12 g
Biological nanofibers Chitin nanofibers (SFo-20002 manufactured by Sugino Machine Limited; 1 wt% solution) 400 g
Insulation hollow structure filler pearlite (Pacific pearlite manufactured by Pacific Material Co., Ltd.) 4g
Heat-shielding inorganic powder Titanium oxide (manufactured by JR-1000 TAYCA) 8g
(2) Manufacture of coating film The prepared paint dispersion is applied on ^{a bonded steel sheet at a coating amount of 170 g / m 2} and dried under drying conditions (23 ° C., RH 50%) for 3 days to obtain a steel sheet coating film test product (2). Implemented product 3-1) was produced. The film thickness was 0.335 mm.
(3) Evaluation of heat insulating property and heat insulating property The temperature difference between the front and back surfaces of the steel sheet coating film is 9 ° C. (front surface temperature 46 ° C., back surface temperature 37 ° C.), and the thermal conductivity (W / m · K) is 0.100. Met.

<Comparative Example 3-1>
(1) Manufacture of coating film A commercially available product (manufactured by GAINA Nissin Sangyo) is applied on ^{a bonded steel sheet at a coating amount of 290 g / m 2} , and dried under drying conditions (23 ° C., RH 50%) for 3 days to form a steel sheet coating film. A test product (comparative product 3-1) was produced. The film thickness was 0.325 mm.
(2) Evaluation of heat insulating property and heat insulating property The temperature difference between the front and back surfaces of the steel sheet coating film is 9 ° C. (front surface temperature 46 ° C., back surface temperature 37 ° C.), and the thermal conductivity (W / m · K) is 0.201. Met.

<Comparative Example 3-2>
The temperature difference between the front and back surfaces of the steel sheet measured only for the bonded steel sheet was 15 ° C. ((front surface temperature 62 ° C., back surface temperature 47 ° C.)).

The present invention can be used in the field of heat insulating and heat insulating coating materials.

Claims (4)

A coating composition having a heat insulating function composed of biological nanofibers. A coating composition having a heat insulating function, which comprises a swellable layered inorganic compound, biological nanofibers, and a heat insulating hollow structure filler. A coating composition having a heat-shielding function, which comprises a swellable layered inorganic compound, biological nanofibers, and a heat-shielding inorganic powder. A heat-insulating heat-shielding paint containing a resin component, a swellable layered inorganic compound, biological nanofibers, a heat-insulating hollow structure filler and a heat-shielding inorganic powder as main components, and the swelling layered inorganic compound is derived from smectite group clay minerals. It is a selected montmorillonite, and the compounding ratio of the montmorillonite and the biological nanofiber to 100 parts by weight of the resin component is 30 parts by weight to 200 parts by weight and 30 parts by weight to 150 parts by weight, respectively. Insulation and heat shield paint .