JP5165986B2 - Thermal insulation laminate - Google Patents

Description

  The present invention relates to a novel heat-insulating and heat-insulating laminate. The laminate of the present invention can be applied to building exterior surfaces such as outer walls, roofs, and rooftops.

Conventionally, the exterior of a building has been painted to protect the building's enclosure or improve aesthetics. Among these, a painting method aimed at preventing an increase in the temperature of the building, reducing the amount of cooling used, suppressing the heat island phenomenon, and the like has attracted attention.

For example, in JP-A-1-126376 (Patent Document 1) and JP-A-1-263163 (Patent Document 2), a spherical hollow body such as a glass balloon, a shirasu balloon, or a resin balloon as a lower layer with respect to a structure substrate. A method of applying a paint containing a solar heat-shielding pigment as an upper layer after applying a heat-insulating paint containing benzene is disclosed.

JP-A-1-126376 JP-A-1-263163

In any of the above prior arts, the top coat layer is formed of a top coat material capable of reflecting sunlight, and the degree of temperature rise of the coating film can be suppressed to a small level as compared with general paints. However, there is a risk that contaminants may adhere to the overcoat layer over time in the actual outdoors. Such a pollutant not only impairs the aesthetics of the coating film, but also receives sunlight and becomes a heat storage source, which easily causes a temperature rise.
On the other hand, in the above prior art, if the heat insulation performance is increased by increasing the film thickness of the lower heat insulating layer, the heat generated in the upper overcoat layer cannot be conducted and diffused in the lower layer direction. The temperature rises. That is, the improvement of the heat insulation performance of the lower layer increases the thermal load on the topcoat layer. Such an increase in thermal load on the top coat layer may cause softening of the top coat film and promote adhesion of contaminants.

This invention is made in view of such a point, and while being able to form the finishing surface with high aesthetics with respect to the surface of a building exterior surface, suppressing the temperature rise of a building and saving energy. The purpose is to provide technology that also contributes.

  In order to solve such problems, the present inventors have intensively studied. As a result, the inventors have conceived that an overcoat layer made of a specific coating material is laminated on the heat-insulating undercoat layer, thereby completing the present invention. It came to.

That is, the present invention has the following characteristics.
1. It is a heat-insulating and heat-insulating laminate constituting the building exterior surface,
From the indoor side to the outdoor side of the exterior surface, the heat-insulating undercoat layer (B) formed by the base material layer (A), the base material containing the binder and the hollow particles,
The synthetic resin emulsion (p), the modified condensate (q) of alkoxysilane having at least one polyoxyalkylene group, and the infrared reflective powder (r) are essential components,
The synthetic resin emulsion (p) is a multilayer structure type synthetic resin emulsion in which the glass transition temperature of the entire resin is -20 to 60 ° C. and the glass transition temperature of the shell portion is higher than that of the core portion, and the glass transition of the core portion. The temperature is −80 to 20 ° C., the glass transition temperature of the shell part is 0 to 100 ° C., and the glass transition temperature of the shell part is 20 ° C. higher than the glass transition temperature of the core part,
With respect to 100 parts by weight of the solid content of the synthetic resin emulsion (p), 1.0 to 40.0 parts by weight of the alkoxysilane modified condensate (q) in terms of SiO ₂ , the infrared reflective powder (r ) Is formed by an aqueous coating material containing 1 to 200 parts by weight (C)
A heat-insulating and heat-insulating laminate characterized by comprising:
2. The infrared reflective powder (r) contains a metal oxide having a refractive index of 1.3 to 2.0. The heat insulation heat insulation laminated body of description.

  In this invention, adhesion of the pollutant used as a heat storage source can be suppressed. Therefore, according to this invention, while being able to maintain the aesthetics of a building exterior surface over a long period of time, a thermal-insulation heat insulation property can be provided and the temperature rise of a building can be suppressed. The present invention can be utilized as a technology that contributes to energy saving.

  Hereinafter, the best mode for carrying out the present invention will be described.

[Base material layer]
The base material layer (A) in the present invention is not particularly limited as long as it constitutes a building exterior surface. For example, concrete, mortar, cement board, extruded plate, slate plate, PC plate, ALC plate, Fiber reinforced cement board, metal board, porcelain tile, metal siding board, ceramic siding board, ceramic board, plaster board, plastic board, hard wood cement board, PVC extruded siding board, brick, plywood, etc., or a composite of these Etc. Such a base material layer may have some surface treatment layer (for example, a sealer layer, a putty layer, a surfacer layer, etc.).

[Insulating undercoat layer]
The heat insulating undercoat layer (B) is formed of an undercoat material containing a binder and hollow particles.
As the binder, an organic binder and / or an inorganic binder can be used. Among these, as the organic binder, for example, a synthetic resin emulsion, a water-soluble resin, a solvent-type resin, a solventless resin, a powder resin, and the like can be used. Specifically, as the type of resin, for example, chloroprene rubber, styrene-butadiene rubber, acrylonitrile-butadiene rubber, methyl methacrylate-butadiene rubber, butadiene rubber, acrylic resin, vinyl acetate resin, vinyl chloride resin, epoxy resin, asphalt, Examples include rubber asphalt. Among these, an acrylic resin emulsion is preferably used. As the acrylic resin emulsion, nitrile group-containing acrylic resin emulsion, amide group-containing acrylic resin emulsion, cationic acrylic resin emulsion and the like are particularly suitable.

Examples of the inorganic binder include colloidal metal oxides such as colloidal silica and colloidal alumina, water-soluble alkali metal silicates such as sodium silicate, potassium silicate, and lithium silicate, Portland cement, alumina cement, and acidic phosphoric acid. Examples include various cements such as salt cement, silica cement, blast furnace cement and the like. Of these, cement is preferably used.
As the inorganic binder, those having a whiteness of 70 or more (preferably 80 or more, more preferably 90 or more) are suitable. By using such a thing with high whiteness, a temperature rise inhibitory effect etc. can be heightened. In addition, the whiteness said here is L ^* value measured using a spectrophotometer.

As the binder in the undercoat material of the present invention, it is desirable to use only an organic binder or to use an inorganic binder and an organic binder in combination. Among these, when the inorganic binder and the organic binder are used in combination, the solid content weight ratio of the inorganic binder and the organic binder is 98/2 to 50/50 (preferably 95/5 to 80/20). Is desirable. Further, it is desirable to use cement as the inorganic binder and use a synthetic resin emulsion, particularly an acrylic resin emulsion, as the organic binder. As the acrylic resin emulsion, a nitrile group-containing acrylic resin emulsion, a cationic acrylic resin emulsion or the like is desirable, and a nitrile group-containing cationic acrylic resin emulsion is particularly preferable. By using such a binding material, performance such as adhesion and strength can be improved, and as a result, a stable temperature rise suppressing effect and the like can be obtained over a long period of time.

  The hollow particles are a component that imparts heat insulation to the undercoat layer (B). Examples of the hollow particles include hollow ceramic particles and hollow resin particles. Examples of the ceramic component constituting the hollow ceramic particles include sodium silicate glass, aluminum silicate glass, borosilicate sodium glass, fly ash, alumina, shirasu, obsidian and the like. Examples of the resin component constituting the hollow resin particles include acrylic resin, styrene resin, acrylic-styrene copolymer resin, acrylic-acrylonitrile copolymer resin, acrylic-styrene-acrylonitrile copolymer resin, acrylonitrile-methacrylonitrile copolymer resin, Examples thereof include acrylic-acrylonitrile-methacrylonitrile copolymer resins and vinylidene chloride-acrylonitrile copolymer resins. The hollow particles can be obtained by foaming these components by a known method.

The average particle diameter of the hollow particles is usually about 0.1 to 200 μm (preferably 1 to 150 μm). The density of the hollow particles is usually about 0.01 to 1 g / cm ³ (preferably 0.01 to 0.8 g / cm ³ ).
The mixing ratio of the hollow particles is usually 0.5 to 200 parts by weight, preferably 1 to 100 parts by weight with respect to 100 parts by weight of the solid content of the binder.

  The undercoat material of the present invention can be produced by uniformly mixing the above-described components by a known method, but other components that can be used in a normal coating material can be mixed as necessary. Examples of such components include coloring pigments, extender pigments, thickeners, film-forming aids, leveling agents, plasticizers, antifreezing agents, pH adjusters, diluents, antiseptics, antifungal agents, and algae. Agents, antibacterial agents, dispersants, antifoaming agents, ultraviolet absorbers, antioxidants, light stabilizers, fibers, catalysts, crosslinking agents and the like.

[Overcoat layer]
The overcoat layer of the present invention comprises, as essential components, a synthetic resin emulsion (p), a modified condensate (q) of alkoxysilane having at least one polyoxyalkylene group, and an infrared reflective powder (r). Is.

  Among these, examples of the synthetic resin emulsion (p) (hereinafter also referred to as “component (p)”) include acrylic resin emulsion, acrylic silicon resin emulsion, fluororesin emulsion, and urethane resin emulsion.

Specifically, as a monomer component constituting the (p) component, for example, methyl (meth) acrylate, ethyl (meth) acrylate, isopropyl (meth) acrylate, n-butyl (meth) acrylate, isobutyl (meth) acrylate, (Meth) acrylic acid esters such as 2-ethylhexyl (meth) acrylate and cyclohexyl (meth) acrylate; carboxyl group-containing monomers such as acrylic acid, methacrylic acid, crotonic acid, maleic acid or monoalkyl esters thereof; N-methylaminoethyl Amino group-containing monomers such as (meth) acrylate, dimethylaminoethyl (meth) acrylate, dimethylaminoethyl vinyl ether, N- (2-dimethylaminoethyl) acrylamide; pyridine monomers such as vinylpyridine; Hydroxyl-containing monomers such as droxyethyl (meth) acrylate and hydroxypropyl (meth) acrylate; vinyl ester monomers such as vinyl acetate and vinyl propionate; nitrile group-containing monomers such as acrylonitrile and methacrylonitrile; styrene, 2-methylstyrene, vinyl Aromatic monomers such as toluene; Amide group-containing monomers such as acrylamide, methacrylamide and diacetone acrylamide; Epoxy group-containing monomers such as glycidyl (meth) acrylate and diglycidyl (meth) acrylate; Acrolein, diacetone (meth) acrylamide and vinyl Carbonyl group-containing monomers such as methyl ketone, vinyl ethyl ketone, vinyl butyl ketone; vinyl trimethoxysilane, vinyl triethoxysilane, γ- (meth) Examples thereof include alkoxysilyl group-containing monomers such as acryloyloxypropyltrimethoxysilane and γ- (meth) acryloyloxypropyltriethoxysilane; vinylidene halide monomers such as vinylidene chloride and vinylidene fluoride. These can be used alone or in combination of two or more. In the present invention, an epoxy group-containing synthetic resin emulsion containing an epoxy group-containing monomer as a monomer component is particularly suitable.
The glass transition temperature (hereinafter referred to as “Tg”) of the component (p) can be appropriately set, but is usually −10 to 80 ° C., preferably 0 to 60 ° C.

  When the component (p) contains a carboxyl group-containing monomer, the weight ratio of the monomer to the total monomer weight is 5% or less, more preferably 2% or less, and further 1% or less. An embodiment that does not contain a carboxyl group-containing monomer is also suitable. By limiting to such a range, contamination resistance can be further enhanced.

  Although the manufacturing method of (p) component is not specifically limited, For example, it can manufacture by methods, such as batch polymerization, monomer dripping polymerization, emulsion monomer dripping polymerization, as an emulsion polymerization method.

  As the component (p) in the coating material of the present invention, a multilayer structure type synthetic resin emulsion in which the glass transition temperature of the entire resin is -20 to 60 ° C. and the glass transition temperature of the shell part is higher than the core part is suitable. . By using such a component (p), the contamination resistance can be further enhanced. In such a component (p), the Tg of the core part is −80 to 20 ° C., the Tg of the shell part is about 0 to 100 ° C., and the Tg of the shell part is 20 ° C. or more higher than the Tg of the core part. Is desirable.

  In the present invention, a modified condensate (q) of alkoxysilane having a polyoxyalkylene group (hereinafter also referred to as “component (q)”) is included. In the present invention, the hydrophilicity of the coating film surface is increased by the action of the component (q), and excellent performance in stain resistance and the like can be exhibited.

As the component (q), those having 1 to 4 carbon atoms in the repeating unit of the polyoxyalkylene group are preferred, and polyoxyethylene groups having 2 carbon atoms are more preferred. Moreover, it is preferable that the average molecular weights of a polyoxyethylene group are 150-2000.
(Q) As an alkoxyl group of a component, a C1-C4 thing is preferable and a C2-ethoxy group is more preferable.

The component (q) can be obtained by a known method. Specific production methods include, for example, a method of transesterifying one or more of the alkoxysilane condensates with one or more polyoxyalkylene group-containing products. Is mentioned. That is, the general formula (R ¹ O) _4-a -SiR ² _a
(Wherein R ¹ represents an alkyl group having 1 to 4 carbon atoms, R ² represents an alkyl group, an aryl group, an aralkyl group, or an alkoxyl group having 1 to 4 carbon atoms, and a represents an integer of 0 to 2) ) Represented by a general formula R ³ — (OC _n H _2n ) _m — (hereinafter referred to as “m component”. The raw material before the condensation is referred to as “m component monomer”). R ⁴
(In the formula, R ³ represents a hydrogen atom, an alkyl group, an epoxy group, or an acyl group, R ⁴ represents a hydroxyl group, an alkyl group, an alkoxyl group, an epoxy group, an acyl group, or a carboxyl group, and n is an integer of 1 to 4. , M represents an integer of 1 to 20) and is produced by transesterification with a polyoxyalkylene group-containing compound (hereinafter referred to as “n component”). Particularly, in the transesterification reaction, since it is necessary to have at least one hydroxyl group at the terminal, an n component having a hydroxyl group at the terminal is used. When performing the transesterification reaction, a transesterification catalyst can be added as necessary.

  Specific examples of the m component monomer include tetramethoxysilane, tetraethoxysilane, tetra-n-propoxysilane, tetra-i-propoxysilane, tetra-n-butoxysilane, tetra-i-butoxysilane, and tetra-t. -Butoxysilane, methyltrimethoxysilane, methyltriethoxysilane, methyltripropoxysilane, methyltributoxysilane, ethyltrimethoxysilane, ethyltriethoxysilane, ethyltripropoxysilane, ethyltributoxysilane, propyltrimethoxysilane, propyl Triethoxysilane, propyltripropoxysilane, propyltributoxysilane, butyltrimethoxylane, butyltriethoxysilane, butyltripropoxysilane, butyltributoxysilane, dimethyl Silane, dimethyl diethoxy silane, dimethyl dipropoxy silane, dimethyl dibutoxy silane, diethyl dimethoxy silane, diethyl diethoxy silane, diethyl di-propoxysilane, and condensate of diethyl dibutoxy silane. These can be used individually or in mixture of several types.

  The carbon number of the alkoxysilyl group of the m component is usually 1 to 4 (preferably 2). Moreover, as for the average condensation degree of m component, 1-20 are preferable. When the average degree of condensation exceeds 20, it is not preferable because handling becomes inconvenient.

  Specific examples of the n component include polyoxyethylene glycol, polyoxyethylene glycol monoalkyl ether, polyoxyethylene-propylene glycol, polyoxyethylene-tetramethylene glycol, polyoxyethylene glycol diglycidyl ether, polypropylene glycol diglycidyl ether, polyoxyethylene glycol Oxyethylene diglycolic acid, polyoxyethylene glycol vinyl ether, polyoxyethylene glycol allyl ether, polyoxyethylene glycol diallyl ether, polyoxyethylene alkyl ether, polyoxyethylene sorbitan fatty acid ester, polyoxyethylene fatty acid ester, polyoxyethylene alkylamine Etc. These compounds can be selected from one or a combination of two or more.

  The average molecular weight of the n component is preferably 150 to 2000. When the average molecular weight is less than 150, the stability when the low-contaminating agent obtained by the transesterification reaction with the m component is mixed with the paint tends to be inferior. With gloss paint, excellent gloss is obtained. It will disappear. On the contrary, when the average molecular weight of n component exceeds 2000, it exists in the tendency for the water resistance and hardness of a cured coating film to fall.

The amount of component (q) added is in the range of 1 to 40 parts by weight in terms of SiO _{2 with} respect to 100 parts by weight of the solid content of component (p). When the component (q) is less than 1 part by weight, the effect of reducing contamination cannot be expressed. When the component (q) exceeds 40 parts by weight, the stability of the covering material tends to decrease, which is not practical.

The SiO ₂ conversion in the present invention means the weight remaining as silica (SiO ₂ ) when a compound having a Si—O bond such as alkoxysilane or silicate is completely hydrolyzed and then baked at 900 ° C. Expressed in minutes.
In general, alkoxysilanes and silicates have a property of reacting with water to cause a hydrolysis reaction to form silanol, and further causing a condensation reaction between silanols or between silanol and alkoxy. When this reaction is performed to the ultimate, silica (SiO ₂ ) is obtained. These reactions are RO (Si (OR) ₂ O) _n R + (n + 1) H ₂ O → nSiO ₂ + (2n + 2) ROH
(R represents an alkyl group. N is an integer.)
It is expressed by the reaction formula. The SiO ₂ conversion in the present invention is the conversion of the amount of the remaining silica component based on this reaction formula.

  The coating material of the present invention contains an infrared reflective powder (r) (hereinafter referred to as “(r) component”) in addition to the above-described components. In the present invention, by mixing the component (r), it is possible to suppress heat accumulation of the coating film by sunlight while coloring the coating material in a desired color. Furthermore, in addition to the characteristics of the component (r), the adhesion of the pollutant to the coating film surface is effectively suppressed by the hydrophilizing action of the component (q) and the like, so the pollutant becomes a heat storage field for sunlight. This can be suppressed, and a sufficient heat shielding function is exhibited.

Examples of the infrared reflective powder include aluminum flake, titanium oxide, barium sulfate, zinc oxide, calcium carbonate, silicon oxide, magnesium oxide, zirconium oxide, yttrium oxide, indium oxide, alumina, iron-chromium composite oxide, manganese -Bismuth complex oxide, manganese-yttrium complex oxide, manganese-iron-cobalt complex oxide, perylene pigment, azo pigment, quinacridone pigment, dial, vermilion, titanium red, cadmium red, isoindolinone, isoindoline, benz Examples thereof include imidazolone, phthalocyanine green, phthalocyanine blue, cobalt blue, indanthrene blue, ultramarine blue, and bitumen, and one or more of these can be used. The hue of the coating material can be set by appropriately selecting and preparing the type and amount of these infrared reflective powders.

  In the present invention, the infrared reflective powder is a metal oxide (silicon oxide, having a refractive index of 1.3 to 2.0 (preferably 1.4 to 1.8) and an average particle size of 0.1 to 1 μm. (Including aluminum oxide). By using such a metal oxide, the heat storage suppression effect of the coating film can be further enhanced. In particular, it is effective when the lightness of the Munsell display system is 8 or less (or 7 or less) in the color tone of the formed coating film.

  The mixing amount of the component (r) is usually 1 to 200 parts by weight, preferably 2 to 100 parts by weight with respect to 100 parts by weight of the solid content of the component (p). Within such a range, the coating material can be toned in a desired color, which is advantageous in terms of temperature rise suppression effect, crack resistance of the coating film, and the like.

The coating material of the present invention can also contain true spherical hollow particles. Such blending of spherical hollow particles is desirable in terms of improving heat insulation and antifouling properties.

  In addition, various additives can be added to the coating material of the present invention. Examples of such additives include curing agents, plasticizers, preservatives, antifungal agents, antialgae agents, antifoaming agents, leveling agents, pigment dispersants, antisettling agents, anti-sagging agents, catalysts, curing accelerators, Examples include dehydrating agents, matting agents, ultraviolet absorbers, and antioxidants.

  The form of the coating material of the present invention is not particularly limited as long as it is composed of the synthetic resin emulsion (p), the alkoxysilane-modified condensate (q), and the infrared reflective powder (r). . Usually, it is desirable to use a two-component paint comprising a main component containing the component (p) and the component (r) and a curing agent containing the component (q). Such a form is preferable in terms of ensuring the stability of the coating material and exhibiting antifouling performance.

[Method of forming a heat insulating and heat insulating laminate]
The heat insulation heat insulation laminated body of this invention has a base material layer (A), a heat insulation undercoat layer (B), and a topcoat layer (C) toward the outdoor side from the indoor side of an exterior surface. In such a heat-insulating and heat-insulating laminate, the primer is applied to the base material layer (A) to form the heat-insulating primer (B), and then the coating is applied to the base layer (A). It can be obtained by forming the layer (C). Construction of each material, drying curing, etc. are usually performed at room temperature.

  The heat insulating undercoat layer (B) can be formed by applying the undercoat material on the base material layer (A). In painting, painting tools such as sprays, rollers, brushes, scissors and the like can be used. The thickness of the heat-insulating undercoat layer (B) may be appropriately set according to the desired heat-insulating performance, but is usually about 0.5 to 20 mm.

  The heat insulating undercoat layer (B) can be formed of two or more types of undercoat materials. As an example, the aspect which uses the 1st primer which contains an inorganic binder, an organic binder, and a hollow particle, and uses the 2nd primer which contains an organic binder and a hollow particle is mentioned. In such an embodiment, the first undercoat material can provide a base adjustment function, a base reinforcement function, and the like, and the second undercoat material can provide a concavo-convex pattern.

In the present invention, a heat-insulating undercoat layer (B ′) may be provided between the heat-insulating undercoat layer (B) and the topcoat layer (C). Providing such a layer is preferable in view of the effects of the present invention. Such a heat-insulating undercoat layer (B ′) can be formed of an undercoat material containing a binder and an infrared reflective powder. The thickness of the thermal barrier undercoat layer (B ′) is usually about 10 to 300 μm.
Moreover, the same effect can also be acquired by using what mix | blended infrared reflective powder as an undercoat material which forms a heat-insulating undercoat layer (B). In this case, the infrared reflective powder may be blended in an amount of usually about 1 to 400 parts by weight (preferably 2 to 200 parts by weight) with respect to 100 parts by weight of the solid content of the binder of the primer.

  The topcoat layer (C) may be formed by applying a coating material on the heat-insulating undercoat layer (B) or the heat-shielding undercoat layer (B ′). In painting, painting tools such as sprays, rollers, and brushes can be used. The thickness of the topcoat layer (C) is usually about 10 to 300 μm.

  Examples and Comparative Examples are shown below to clarify the features of the present invention.

(Synthesis of alkoxysilane-modified condensate)
100 parts by weight of an ethyl silicate condensate having an average molecular weight of 750 (average molecular weight 750, residual silica ratio of 40% by weight), which is a condensate of tetraethoxysilane, and polyoxyethylene glycol # 200 having an average molecular weight of 200 (manufactured by Wako Pure Chemical Industries, Ltd.) ) 106.7 parts by weight, and 0.02 part by weight of dibutyltin dilaurate was added as a catalyst, followed by deethanol reaction at 75 ° C. for 8 hours to synthesize alkoxysilane-modified condensate (1). The residual silica ratio of the alkoxysilane-modified condensate (1) was 20.9% by weight.

(Manufacture of main agent)
・ Main agent (1)
200 parts by weight of synthetic resin emulsion 1 is charged in a container, 80 parts by weight of titanium oxide, 1 part by weight of catalyst, 2 parts by weight of thickener, and 1 part by weight of antifoaming agent are mixed in this manner. The main agent (1) was produced by stirring uniformly.

・ Main agent (2)
200 parts by weight of synthetic resin emulsion 1 is charged in a container, 40 parts by weight of titanium oxide, 40 parts by weight of aluminum oxide, 1 part by weight of catalyst, 2 parts by weight of thickener, and 1 part by weight of antifoaming agent. Were mixed and stirred uniformly by a conventional method to produce the main agent (2).

・ Main agent (3)
200 parts by weight of synthetic resin emulsion 2 is charged in a container, and 40 parts by weight of titanium oxide, 1 part by weight of catalyst, 2 parts by weight of thickener, and 1 part by weight of antifoaming agent are mixed in the container. The main agent (3) was produced by stirring uniformly.

・ Main agent (4)
200 parts by weight of synthetic resin emulsion 2 is charged in a container, 40 parts by weight of titanium oxide, 40 parts by weight of aluminum oxide, 1 part by weight of catalyst, 2 parts by weight of thickener, and 1 part by weight of antifoaming agent. Were mixed and stirred uniformly by a conventional method to produce the main agent (4).

In the production of the main agent, the following raw materials were used.
Synthetic resin emulsion 1 (Methyl methacrylate / 2-ethylhexyl acrylate / cyclohexyl methacrylate copolymer emulsion, solid content 50 wt%, pH 6.2, Tg 15 ° C.)
Synthetic resin emulsion 2 (multi-layer structure emulsion of methyl methacrylate, 2-ethylhexyl acrylate and cyclohexyl methacrylate copolymer, solid content 50% by weight, pH 6.3, Tg-12 ° C. of core part, Tg 40 ° C. of shell part, whole Tg15 ℃)
-Titanium oxide (refractive index 2.71, average particle size 0.3 μm),
Aluminum oxide (refractive index 1.76, average particle size 0.6 μm)
・ Film-forming aid: 2,2,4-trimethyl-1,3-pentanediol monoisobutyrate ・ Catalyst: Dibutyltin dilaurate ・ Thickener: Urethane thickener ・ Defoamer: Silicone defoamer

○ Example 1
A main agent prepared by mixing phthalocyanine green, phthalocyanine blue, perylene red, and benzimidazolone yellow with the aforementioned main agent (1) to a gray color having a Munsell display system brightness of 6, and an alkoxysilane-modified condensate (1) Were uniformly mixed at a weight ratio of 95: 5 to obtain a coating material A.
On one side of the aluminum plate, Portland cement (L ^* value 93), fly ash balloon (average particle size 90 μm, density 0.78 g / cm ³ ), nitrile group-containing cationic acrylic resin emulsion (solid content 50% by weight), And undercoating material A obtained by kneading and water (weight ratio 100: 35: 22: 30) was applied by coating, and after curing for 16 hours, coating material A was spray-coated and cured for 7 days.
Thus, a test body was obtained in which an undercoat layer having a dry thickness of 3 mm and an overcoat layer having a dry thickness of 60 μm were laminated. The test plates were all prepared and cured in standard conditions (temperature 23 ° C., relative humidity 50%).

・ Test 1
An infrared lamp was irradiated from a distance of 50 cm to the coating film of the test body obtained by the above method, and the back surface temperature of the test body when the temperature rise reached equilibrium was measured.
Next, the test specimen was immersed in a carbon black water dispersion paste (concentration: 1% by weight) for 2 hours, and then the test specimen was pulled up and allowed to stand in a standard state for 24 hours. An infrared lamp was irradiated from a distance of 50 cm to the coating film of the test body subjected to the above treatment, and the back surface temperature of the test body when the temperature rise reached equilibrium was measured.

  The results are shown in Table 1.

Example 2
A main agent prepared by mixing phthalocyanine green, phthalocyanine blue, perylene red, and benzimidazolone yellow with the aforementioned main agent (2) into a gray color having a Munsell display system brightness of 6, and an alkoxysilane-modified condensate (1) Were uniformly mixed at a weight ratio of 95: 5 to obtain a coating material B.
Each test was performed in the same manner as in Example 1 except that the coating material B was used instead of the coating material A. The results are shown in Table 1.

Example 3
A main agent prepared by mixing phthalocyanine green, phthalocyanine blue, perylene red, and benzimidazolone yellow with the aforementioned main agent (3) into a gray color having a Munsell display system brightness of 6, and an alkoxysilane-modified condensate (1) Were uniformly mixed at a weight ratio of 95: 5 to obtain a coating material C.
Each test was performed in the same manner as in Example 1 except that the coating material C was used instead of the coating material A. The results are shown in Table 1.

Example 4
A main agent prepared by mixing phthalocyanine green, phthalocyanine blue, perylene red, and benzimidazolone yellow with the main agent (4) described above to produce a Munsell display system with a lightness of 6 in gray, and an alkoxysilane-modified condensate (1) Were uniformly mixed at a weight ratio of 95: 5 to obtain a coating material D.
Each test was performed in the same manner as in Example 1 except that the coating material D was used instead of the coating material A. The results are shown in Table 1.

○ Comparative Example 1
A coating material E was obtained by mixing phthalocyanine green, phthalocyanine blue, perylene red, and benzimidazolone yellow with the main agent (1) described above to prepare a Munsell display system with a lightness of 6 gray.
Each test was performed in the same manner as in Example 1 except that the coating material E was used instead of the coating material A. The results are shown in Table 1.

○ Comparative Example 2
Carbon black is mixed with the above-mentioned main agent (1), and the main agent prepared in a Munsell display system with a lightness of 6 gray and the alkoxysilane-modified condensate (1) are uniformly mixed at a weight ratio of 95: 5. Thus, a covering material F was obtained.
Each test was performed in the same manner as in Example 1 except that the coating material F was used instead of the coating material A. The results are shown in Table 1.

Claims (2)

It is a heat-insulating and heat-insulating laminate constituting the building exterior surface,
From the indoor side to the outdoor side of the exterior surface, the heat-insulating undercoat layer (B) formed by the base material layer (A), the base material containing the binder and the hollow particles,
The synthetic resin emulsion (p), the modified condensate (q) of alkoxysilane having at least one polyoxyalkylene group, and the infrared reflective powder (r) are essential components,
The synthetic resin emulsion (p) is a multilayer structure type synthetic resin emulsion in which the glass transition temperature of the entire resin is -20 to 60 ° C. and the glass transition temperature of the shell portion is higher than that of the core portion, and the glass transition of the core portion. The temperature is −80 to 20 ° C., the glass transition temperature of the shell part is 0 to 100 ° C., and the glass transition temperature of the shell part is 20 ° C. higher than the glass transition temperature of the core part,
With respect to 100 parts by weight of the solid content of the synthetic resin emulsion (p), 1.0 to 40.0 parts by weight of the alkoxysilane modified condensate (q) in terms of SiO ₂ , the infrared reflective powder (r ) Is formed by an aqueous coating material containing 1 to 200 parts by weight (C)
A heat-insulating and heat-insulating laminate characterized by comprising: The thermal insulation heat insulation laminated body of Claim 1 in which the said infrared reflective powder (r) contains the metal oxide of refractive index 1.3-2.0.