JP2010168893A - Heat-insulating structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To make a finished surface of an exterior wall of a building using lightweight mortar exert stable performance for a long time by enhancing adhesion property of a finish-coating material film. <P>SOLUTION: A heat-insulating structure includes: a substrate layer (A); an inorganic heat-insulating material layer (B) formed of light-weight mortar containing cement and light-weight aggregates as essential ingridients; and a finishing layer (C) formed of a finish-coating material, wherein the layers are arranged in the order from the indoor side to the outdoor side of the wall face. At least the outdoor side surface of the inorganic layer (B) is treated with a treatment solution having an epoxy group containing resin emulsion (m) and water-soluble silicate (n) with a solid-content weight ratio of the emulsion (m) and the water-soluble silicate (n) is 90:10 to 10:90. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a heat insulating structure constituting an outer wall surface of a building.

  In recent years, in buildings such as houses, stores, factories, etc., there are active efforts to realize energy saving by saving air conditioning costs by increasing heat insulation and airtightness. In general, in buildings that are not designed for thermal insulation, indoor heat escapes from the roof, floor, windows, walls, etc. during heating in the winter, and outdoor heat enters from these parts during cooling in the summer. It is said that about one third of such heat loss is caused by the wall surface. Therefore, in order to realize energy saving in buildings, it is indispensable to increase the heat insulation of the outer wall that separates the room from the outside, and many methods have been proposed to increase heat insulation by laminating heat insulating materials on the base material that constitutes the wall surface. ing.

  One such heat insulating material is a lightweight mortar. Lightweight mortar is a material mainly composed of cement, lightweight aggregate, etc., and has excellent heat insulation properties, and has the ability to prevent the spread of fire from nearby fires. Is used. In addition, with a lightweight mortar, a seamless appearance finish can be obtained, and in addition, in order to improve its aesthetics, a finish can be applied with a finish coating material (for example, Patent Document 1).

Japanese Patent No. 2567021

  However, on the outdoor side surface of the lightweight mortar layer, there is no escape from heat by direct sunlight, so the coating film of the finish coating material formed on the lightweight mortar layer is directly affected and the temperature is very high. It becomes easy to rise. Such a temperature rise may induce abnormalities such as swelling and peeling of the coating film. In addition, since lightweight mortar itself is not so high in strength, it may be difficult to obtain sufficient physical properties in terms of adhesion to the finish coating material layer.

  The present invention has been made in view of such a problem, and on the finished surface of a building outer wall using a lightweight mortar, it is intended to improve the adhesion of the finish coating film and to exhibit stable performance over a long period of time. It is the purpose.

  In order to solve such problems, the present inventors have conducted intensive studies. As a result, the light weight mortar is obtained by using a treatment liquid containing an epoxy group-containing synthetic resin emulsion (m) and a water-soluble silicate (n) as essential components. The inventors have come up with the idea that it is effective to treat the surface and have completed the present invention.

That is, the present invention has the following characteristics.
1. It is a heat insulating structure that constitutes the outer wall surface of the building, from the indoor side to the outdoor side of the wall surface,
It has a base material layer (A), an inorganic heat insulating layer (B) formed by a lightweight mortar containing cement and a lightweight aggregate as essential components, and a finishing material layer (C) formed by a finishing coating material,
The inorganic heat insulating layer (B) has at least an outdoor surface thereof,
It contains an epoxy group-containing synthetic resin emulsion (m) and a water-soluble silicate (n), and the solid content weight ratio of the synthetic resin emulsion (m) and the water-soluble silicate (n) is 90:10 to 10: A heat-insulating structure characterized in that it is treated with a treatment liquid of 90.
2. The synthetic resin emulsion (m) in the treatment liquid contains an epoxy group and at least one polar group selected from a nitrile group, an amide group, and a carbonyl group. The described heat insulating structure.

  According to the present invention, on the finished surface of a building outer wall using lightweight mortar, the adhesion of the finish coating film is improved, and the occurrence of blistering and peeling of the finish coating film is sufficiently suppressed. And stable performance over a long period of time.

[Base material layer]
The base material layer (A) in the present invention is not particularly limited as long as it constitutes the outer wall surface of the building. 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, gypsum board, plastic board, hard wood cement board, PVC extrusion siding board, plywood, etc. can give. Such a base material layer may have some surface treatment layer (for example, a sealer layer, a surfacer layer, etc.).

[Inorganic insulation layer]
The inorganic heat insulating layer (B) is formed of a lightweight mortar containing, as essential components, cement as an inorganic binder and a lightweight aggregate. Specifically, it is obtained by curing a kneaded material containing cement, lightweight aggregate, and water.

  Among these, for example, ordinary Portland cement, early strength Portland cement, super early strength Portland cement, moderately hot Portland cement, sulfate resistant Portland cement, white Portland cement, alumina cement, superhard cement, expanded cement, acidic phosphorus Examples thereof include acid salt cement, silica cement, blast furnace cement, fly ash cement, keens cement and the like.

The lightweight aggregate is a component that imparts performance such as heat insulation, fire resistance, and weight reduction. Examples of such lightweight aggregates include pearlite, expanded vermiculite, pumice, ALC pulverized product, styrene resin foam, ethylene vinyl acetate resin foam, and vinyl chloride resin foam. The lightweight mortar may contain fine aggregate, a setting accelerator, a water reducing agent, a thickener, a fiber material, a dispersant, an organic resin and the like in addition to the above components.
Such a lightweight mortar has an advantage that the specific gravity is about 1/2 of that of a normal mortar, so that the load on the ground is small. In addition, the thermal conductivity is usually about 1/5 that of mortar, and the heat insulation is excellent. Specifically, examples of such lightweight mortar include materials specified in JASS15 M-102 “Prepared lightweight cement mortar for lath-based foundation”, JASS15 M-104 “Lightweight cement mortar for foundation adjustment”, and the like.

[Treatment solution]
In this invention, the outdoor side surface of an inorganic heat insulation layer (B) is processed using a specific process liquid. This treatment liquid (hereinafter referred to as “treatment liquid (K)”) comprises an epoxy group-containing synthetic resin emulsion (m) (hereinafter referred to as “(m) component”) and a water-soluble silicate (n) (hereinafter referred to as “(n)”. Component)) is an essential component. Such a treatment liquid (K) exhibits performances such as impregnation reinforcement, sealing properties, adhesion, etc. in the surface layer of the inorganic heat insulating layer (B). Therefore, in the present invention, by using the treatment liquid (K), the strength of the light mortar surface layer and the adhesion of the finish coating film can be improved, and the finish coating film is swollen and peeled off. Generation | occurrence | production etc. can fully be suppressed.

As the component (m) in the treatment liquid (K), a synthetic resin emulsion having an epoxy group in the emulsion particles can be used. Such a component (m) can be obtained by copolymerizing a monomer group including an epoxy group-containing monomer. In addition, the monomer said by this invention is a general term for the compound which has a polymerizable unsaturated double bond.
Examples of the epoxy group-containing monomer include glycidyl (meth) acrylate, diglycidyl fumarate, 3,4-epoxycyclohexyl (meth) acrylate, 3,4-epoxyvinylcyclohexane, allyl glycidyl ether, and ε-caprolactone-modified glycidyl (meta ) Acrylate, β-methylglycidyl (meth) acrylate, and the like. The weight ratio of the epoxy group-containing monomer in the monomer group is usually 1 to 25% by weight, preferably 3 to 20% by weight. If the weight ratio of the epoxy group-containing monomer is within such a range, it is preferable in terms of adhesion and the like.

  As the component (m), those containing one or more polar groups selected from a nitrile group, an amide group, and a carbonyl group in addition to the epoxy group are preferable. Such a polar group is desirable in terms of improving the effect of the present invention. Furthermore, in the present invention, since such a polar group is contained, the stability when the component (m) and the component (n) are mixed can be improved. It can also be handled. As a result, the efficiency of the processing work can be improved.

The component (m) containing the polar group is copolymerized with a monomer group containing at least one polar monomer selected from a nitrile group-containing monomer, an amide group-containing monomer, and a carbonyl group-containing monomer in addition to the epoxy group-containing monomer. Can be obtained.
Among these, examples of the nitrile group-containing monomer include (meth) acrylonitrile, vinylidene cyanide, α-cyanoethyl (meth) acrylate, and the like.
Examples of the amide group-containing monomer include maleic acid amide, (meth) acrylamide, N-monoalkyl (meth) acrylamide, N, N-dialkyl (meth) acrylamide, 2- (dimethylamino) ethyl (methacrylate), N- [3- (Dimethylamino) propyl] (meth) acrylamide, vinylamide and the like can be mentioned.
Examples of the carbonyl group-containing monomer include acrolein, diacetone (meth) acrylamide, vinyl methyl ketone, vinyl ethyl ketone, and vinyl butyl ketone.
The weight ratio of the polar monomer in the monomer group is usually 0.1 to 15% by weight, preferably 0.2 to 10% by weight. If the weight ratio of the polar monomer is within such a range, the stability of the treatment liquid is enhanced, and it is also preferable in terms of adhesion and the like.
As the component (m), an embodiment including at least a nitrile group-containing monomer as the polar monomer is preferable.

As the component (m), a resin component that is a polymer of a monomer group including the above-described monomer and (meth) acrylic acid alkyl ester and / or aromatic monomer is preferable.
Among these, as (meth) acrylic acid alkyl ester, for example, methyl (meth) acrylate, ethyl (meth) acrylate, isopropyl (meth) acrylate, n-butyl (meth) acrylate, isobutyl (meth) acrylate, n-amyl ( (Meth) acrylate, isoamyl (meth) acrylate, n-hexyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, octyl (meth) acrylate, decyl (meth) acrylate, dodecyl (meth) acrylate, octadecyl (meth) acrylate, Examples include cyclohexyl (meth) acrylate.
The aromatic monomer is a compound having an aromatic ring and a polymerizable unsaturated double bond. Specific examples thereof include styrene, 2-methylstyrene, vinyltoluene, t-butylstyrene, chlorostyrene, vinylanisole, vinyl. Naphthalene, divinylbenzene, phenyl (meth) acrylate, benzyl (meth) acrylate and the like can be mentioned.
What is necessary is just to set the total amount of these monomers ((meth) acrylic-acid alkylester and aromatic monomer) within the range in which the weight ratio will be 60 to 99 weight% (preferably 70 to 97 weight%) in a monomer group. If the weight ratio of these monomers is within such a range, it is preferable in terms of adhesion and the like. In addition, in the component (m), by using both such (meth) acrylic acid alkyl ester and aromatic monomer, performance such as adhesion can be further enhanced.

  In the component (m), monomers other than those described above can be used as long as the effects of the present invention are not impaired. Examples of such monomers include (meth) acrylic acid, crotonic acid, maleic acid, itaconic acid, fumaric acid, isocrotonic acid, salicylic acid, and other carboxyl group-containing monomers; aminomethyl acrylate, aminoethyl acrylate, aminopropyl (meta ) Acrylate, amino-n-butyl (meth) acrylate, butylvinylbenzylamine, vinylphenylamine, p-aminostyrene, N-methylaminoethyl (meth) acrylate, Nt-butylaminoethyl (meth) acrylate, etc. Amino group-containing monomers; hydroxyl group-containing monomers such as hydroxypropyl (meth) acrylate, ethylene glycol mono (meth) acrylate, glycerol mono (meth) acrylate; vinylidene halide monomers such as vinylidene fluoride , Ethylene, propylene, isoprene, butadiene, vinyl ethers, vinyl ketones, and silicone macromer and the like.

  Among the above monomers, the carboxyl group-containing monomer is desirably 3% by weight or less (preferably 1% by weight or less) in the monomer group. An embodiment that does not contain a carboxyl group-containing monomer is also suitable. Regarding the amino group-containing monomer, the weight ratio in the monomer group is desirably 3% by weight or less (preferably 1% by weight or less), and an embodiment in which no amino group-containing monomer is contained is also suitable. In the present invention, by suppressing the use of such a monomer, the polarity of the epoxy group is utilized and excellent adhesion can be exhibited.

The component (m) can be produced by emulsion polymerization of a monomer group obtained by appropriately mixing the above monomers by a known method.
As the emulsifier, various surfactants usable in emulsion polymerization can be used, and these may be reactive types (reactive surfactants) having a polymerizable unsaturated double bond. As the emulsifier, an anionic surfactant and a nonionic surfactant are usually used alone or in combination.
Examples of anionic surfactants include sulfonic acid alkali metal salts such as sodium dodecylbenzene sulfonate, sodium lauryl naphthalene sulfonate, sodium stearyl diphenyl ether disulfonate; sodium lauryl sulfate, polyoxyethylene sodium lauryl ether sulfate, polyoxyethylene Examples thereof include sulfate ester alkali metal salts such as sodium octylphenyl ether sulfate.
Examples of nonionic surfactants include polyoxyethylene lauryl ether, polyoxyethylene oleyl ether, polyoxyethylene octylphenyl ether, polyoxyethylene nonylphenyl ether, and oxyethylene / oxypropylene block copolymer.

  The component (m) is preferably an emulsifier using at least an anionic surfactant. Thereby, the average particle diameter of (m) component can be made comparatively small, and an impregnation reinforcement property etc. can be improved. Specific examples include the case where an anionic surfactant is used alone, or the case where an anionic surfactant and a nonionic surfactant are used in combination.

  (M) The average particle diameter of a component is 300 nm or less normally, Preferably it is 20-120 nm, More preferably, it is 30-100 nm. When the average particle diameter is within such a range, advantageous effects can be obtained in impregnation reinforcement properties, sealing properties, whiteness resistance, and the like. The average particle diameter referred to here is a value measured by a dynamic light scattering method.

  The glass transition temperature (hereinafter referred to as “Tg”) of the component (m) can be adjusted by selecting the type of monomer, the mixing ratio, and the like. The Tg may be appropriately set in consideration of the final required performance and the like, but is usually about −50 to 80 ° C., preferably about −40 to 60 ° C. In addition, Tg of a synthetic resin emulsion can be calculated | required with the formula of Fox.

The water-soluble silicate (n) in the treatment liquid (K) is an essential component for imparting impregnation reinforcement, adhesion and the like. As the component (n), specifically, one represented by M ₂ O.nSiO ₂ (M represents an alkali metal. N is 2 to 10) can be used. As the alkali metal M, one or more selected from Li, Na, and K are preferable. Examples of such a component (n) include water-soluble lithium silicate, water-soluble sodium silicate, water-soluble potassium silicate, and the like. Among these, water-soluble lithium silicate is particularly preferable.
N in said formula is 2-10 normally, Preferably it is 3-8. If n is within such a range, advantageous effects can be obtained in terms of whiteness resistance, water resistance, etc. in addition to impregnation reinforcement and adhesion.
Further, such (n) component is preferably completely water-soluble. In the case of a colloidal material, it may be difficult to obtain a sufficient effect in terms of impregnation reinforcement, adhesion, and the like.

In the present invention, the solid content weight ratio of the component (m) and the component (n) is usually 90:10 to 10:90, preferably 80:20 to 30:70, more preferably 75:25 to 50:50. To do.
If the weight ratio of the solid content of the component (m) and the component (n) is within such a range, it is preferable from the viewpoint of the effect of the present invention. When the amount of the component (n) is less than the above ratio, it is difficult to obtain a sufficient effect in impregnating reinforcement properties. On the other hand, when the amount of the component (n) is too much than the above ratio, problems are likely to occur in the finish and adhesion of the finishing material layer.

In the treatment liquid (K) in the present invention, in addition to the above components, it is desirable to include a nonionic surfactant (o) having an HLB of 12 or more (hereinafter referred to as “component (o)”). By mixing the component (o), the impregnation reinforcing property and the like can be further enhanced. Furthermore, the mixing stability of the component (m) and the component (n) can be improved.
Specific examples of the component (o) include, for example, polyoxyethylene lauryl ether, polyoxyethylene oleyl ether, polyoxyethylene octyl phenyl ether, polyoxyethylene nonyl phenyl ether, oxyethylene / oxypropylene block copolymer, and the like. Of these, those having an HLB of 12 or more can be used. (O) HLB of a component becomes like this. Preferably it is 12-17, More preferably, it is 13-15. HLB is an abbreviation for hydrophilic-lipophilic balance, and is a numerical representation of the hydrophilic / lipophilic strength ratio of an amphiphilic substance.
The component (o) may be mixed in a weight ratio of usually 1 to 30 parts by weight, preferably 2 to 20 parts by weight, based on 100 parts by weight of the solid content of the component (m).

The treatment liquid (K) preferably contains a poorly water-soluble solvent (p) (hereinafter referred to as “component (p)”) having a solubility in water of 5 g / 100 g or less in addition to the above components. By including the component (p), it is possible to improve suitability for the base and the like, and it is also preferable in terms of finish of the top coating material. (P) As a component, the thing whose solubility to water is less than 1 g / 100g is more desirable.
Specific examples of the component (p) include, for example, diethylene glycol mono-2-ethylhexyl ether, diethylene glycol dibutyl ether, 2,2,4-trimethyl-1,3-pentanediol monoisobutyrate, 2,2,4-trimethyl- 1,3-pentanediol diisobutyrate and the like can be mentioned.
The mixing ratio of the component (p) is preferably 1 to 40 parts by weight, more preferably 2 to 30 parts by weight with respect to 100 parts by weight of the solid content of the component (m). If it is such a ratio, the suitability to a foundation | substrate, the finish of a top coat material, etc. can be improved.

  In addition to the above components, the treatment liquid (K) is a coloring pigment, extender pigment, aggregate, plasticizer, film-forming aid, antifreezing agent, antiseptic agent, antifungal agent, antibacterial agent, antifoaming agent, pigment dispersant. , Thickeners, leveling agents, wetting agents, pH adjusting agents, fibers, matting agents, UV absorbers, antioxidants, light stabilizers, adsorbents, catalysts, crosslinking agents, water, etc. Good.

[Finish material layer]
In this invention, a finishing material layer (C) is provided on the said inorganic heat insulation layer (B) (outdoor side). This finishing material layer (C) is formed by various finishing coating materials.

  The finish coating material is not particularly limited as long as it can be applied to the outer wall surface of a building, and one or more coating materials can be used. Examples of finish coating materials include JIS A6909 “Building finish coating materials”, specifically synthetic resin emulsion-based thin finish coating materials, flexible exterior synthetic resin emulsion-based thin finish coating materials, and waterproofing. Shaped exterior synthetic resin emulsion-based thin finish coating materials, exterior synthetic resin solution-based thin finish coating materials, etc., siliceous thickening finish coating materials, synthetic resin emulsion-based thickening finish coating materials, etc. Thick finish coating material, Synthetic resin emulsion-based multi-layer finish coating, Waterproof synthetic resin emulsion-based multi-layer finish coating, Reaction-curing synthetic resin emulsion-based multi-layer finish coating material, Synthetic resin solution-based multi-layer finish coating Examples thereof include multilayer finishing coating materials such as materials, waterproof synthetic resin solution-based multilayer finishing coating materials, and weather resistant multilayer coating finishing materials. In addition, NSKS-011 "Stone Finishing Coating Material", JIS K5654 "Acrylic Resin Enamel", JASS18 M-207 "Non-Water Dispersed Acrylic Resin Enamel", JIS K5656 "Polyurethane Resin Paint for Architecture", JASS18 M-404 " Acrylic silicone resin paint ", JIS K5658" Fluorine resin paint for construction ", JIS K5660" Glossy synthetic resin emulsion paint ", JIS K5663" Synthetic resin emulsion paint ", JIS K5667" Multi-color paint ", JIS K5668" Synthetic resin emulsion " Pattern paint "etc. can also be used.

[Undercoat layer]
In this invention, a finishing material layer (C) can be provided on the said inorganic heat insulation layer (B) (outdoor side) through an undercoat material layer. As the undercoat material layer, those having an elongation percentage of 50 to 500% (preferably 70 to 350%) according to “Elongation test at 20 ° C.” of JIS A6909 7.31 “Elongation test” are suitable. Providing such an undercoat material layer is preferable in terms of preventing water from entering the base material layer (A) and the inorganic heat insulating layer (B), and thus improving the durability of the entire heat insulating structure.

Such an undercoat material layer is formed from an undercoat material containing a resin component, an extender pigment, and a color pigment if necessary.
In the resin component, for example, a synthetic resin such as vinyl acetate resin, vinyl chloride resin, epoxy resin, acrylic resin, urethane resin, acrylic silicon resin, fluorine resin, or a composite thereof can be used. Of these, one or more selected from acrylic resins, urethane resins, acrylic silicon resins, and fluororesins are particularly suitable. Further, as a form of the synthetic resin, a water-dispersed resin (synthetic resin emulsion) is preferable.
The Tg of the synthetic resin is preferably −60 to 40 ° C., more preferably −40 to 30 ° C., and still more preferably about −20 to 20 ° C. When the Tg of the synthetic resin is within such a range, it is possible to suppress the occurrence of cracks in the finishing material layer while ensuring followability to the base.

In the undercoat material, a resin component in which the synthetic resin is combined with a light stabilizer and / or an ultraviolet absorber is preferable. By using such a resin component in the undercoat material, it becomes possible to maintain a crack prevention effect and the like over a long period of time.
Examples of the form in which the light stabilizer and / or the ultraviolet absorber are combined with the synthetic resin include one or both of a form dispersed in the synthetic resin and a form chemically bonded to the synthetic resin. In the present invention, a higher effect can be obtained by including at least a state in which the light stabilizer and / or the ultraviolet absorber is chemically bonded to the synthetic resin. It is desirable that the light stabilizer and / or ultraviolet absorber is usually contained in the resin component in an amount of 0.01 to 20% by weight (preferably 0.1 to 10 parts by weight) in terms of solid content.

  Specifically, examples of the light stabilizer include bis (2,2,6-tetramethyl-4-piperidyl) sebacate, bis (1,2,2,6,6-pentamethyl-4-piperidyl) sebacate, 2 -(3,5-di-t-butyl-4-hydroxybenzyl) -2-n-butylmalonate bis (1,2,2,6,6-pentamethyl-4-piperidyl), tetrakis (2,2, 6,6-tetramethyl-4-piperidyl) -1,2,3,4-butanetetracarboxylate, tetrakis (1,2,2,6,6-pentamethyl-4-piperidyl) -1,2,3 Examples include 4-butanetetracarboxylate.

Examples of the ultraviolet absorber include 2,4-dihydroxybenzophenone, 2-hydroxy-4-methoxybenzophenone, 2-hydroxy-4-octyloxybenzophenone, 2-hydroxy-4-dodecyloxybenzophenone, and 2,2′-dihydroxy. Benzophenone ultraviolet absorbers such as -4-methoxybenzophenone, 2-hydroxy-4-methoxybenzophenone-5-sulfonic acid, 2,2-dihydroxy-4,4'-dimethoxybenzophenone-5,5'-disulfonic acid;
2- (2′-hydroxyphenyl) benzotriazole, 2- (2′-hydroxy-5′-methylphenyl) benzotriazole, 2- (2′-hydroxy-5′-t-butylphenyl) benzotriazole, 2, 2-methylenebis [4- (1,1,3,3-tetramethylbutyl) -6- (2H-benzotriazol-2-yl) phenol, 2-phenylbenzimidazole-5-sulfonic acid, methyl 3- ( Benzotriazole ultraviolet absorbers such as a reaction product of 3- (2H-benzotriazol-2-yl) -5-t-butyl-4-hydroxyphenyl) propionate and polyethylene glycol;
Salicylic acid ultraviolet absorbers such as phenyl salicylate, pt-butylphenyl salicylate, p-octylphenyl salicylate;
Other examples include triazine ultraviolet absorbers, oxalic anilide ultraviolet absorbers, aminobenzoic acid ultraviolet absorbers, cinnamic acid ultraviolet absorbers, and cyanoacrylate ultraviolet absorbers.

  In the present invention, a polymerizable light stabilizer and / or a polymerizable ultraviolet absorber can be used because the light stabilizer and / or the ultraviolet absorber is chemically bonded to the synthetic resin. Specifically, polymerizable light stabilizers such as 4-methacryloyloxy-2,2,6,6-tetramethylpiperidine, 4-methacryloyloxy-1,2,2,6,6-pentamethylpiperidine, Polymerizable ultraviolet absorbers such as -hydroxy-4-acryloxybenzophenone and 2- (2'-hydroxy-5'-methacryloxyethylphenyl) -2H-benzotriazole can be used. Such polymerizable light stabilizers and / or polymerizable ultraviolet absorbers can be chemically bonded by copolymerizing with other monomers during the production of the synthetic resin (at the time of polymerization).

  As extender pigments, heavy calcium carbonate, kaolin, diatomaceous earth, white carbon, clay, talc, barite powder, precipitated barium sulfate, barium carbonate, silica sand and the like can be used. As the color pigment, known inorganic color pigments, organic color pigments and the like can be used. The undercoat material of the present invention is desirably prepared so that the volume concentration of the pigment is 30 to 80% (preferably 40 to 70%) with such extender pigments and colored pigments.

  In addition to the above-mentioned components, the primer is, for example, a catalyst, pigment, dye, aggregate, matting agent, fiber, thickener, leveling agent, plasticizer, film-forming aid, antifreezing agent, preservative, antibacterial agent An agent, an antifungal agent, a dispersant, an antifoaming agent, a pH adjusting agent, and the like may be included.

[Method of forming heat insulation structure]
The heat insulating structure of the present invention has a base material layer (A), an inorganic heat insulating layer (B), and a finishing material layer (C) from the indoor side to the outdoor side of the wall surface, and the inorganic heat insulating layer (B) is , At least the surface thereof is treated with the treatment liquid (K). In such a heat insulating structure, an inorganic heat insulating layer (B) is formed on the base material layer (A), a treatment liquid (K) is applied to the surface, and then a finishing coating material is applied to finish. It can be obtained by forming the material layer (C). When providing the primer layer, the inorganic heat insulating layer (B) is formed on the base material layer (A), the treatment liquid (K) is applied to the surface, and then the primer is applied. A layer is formed, and then a finishing coating material is applied to form a finishing material layer (C). Construction of each material, drying curing, etc. are usually performed at room temperature.

Among these, the inorganic heat insulating layer (B) can be formed by applying a kneaded material obtained by appropriately adding water to a mixture of cement, lightweight aggregate, etc. on the base material layer (A) and curing it. This kneaded product can be applied two or more times. Moreover, it can also apply | coat, sticking waterproof paper, a lath, a mesh, etc. As the applicator, a cocoon is usually used.
Although the thickness of an inorganic heat insulation layer (B) should just be set suitably according to desired heat insulation performance etc., it is about 5-50 mm normally.

In the present invention, the inorganic heat insulation layer (B) is treated by applying and penetrating the treatment liquid (K) to the surface of the inorganic heat insulation layer (B). Through this process, the treatment liquid (K) can reinforce the surface layer of the inorganic heat insulation layer (B) and can form a thin film on the surface of the inorganic heat insulation layer (B), which can greatly contribute to the effect of improving adhesion and the like. It becomes.
When applying the treatment liquid (K), a spray, a roller, a brush, or the like may be used. The application amount of the treatment liquid (K) is usually about 0.05 to 0.5 kg / m ² (preferably about 0.1 to 0.3 kg / m ² ).
The timing for applying the treatment liquid (K) may be before or after the inorganic heat insulating layer (B) is cured. Specifically, although it depends on the environmental conditions at the time of construction, it may be applied usually after about 7 to 30 days have passed after application of the lightweight mortar forming the inorganic heat insulating layer (B).

The finishing material layer (C) may be formed by applying various finishing coating materials to the surface-treated inorganic heat insulating layer. In painting, painting tools such as sprays, rollers, brushes, scissors and the like can be used. The thickness of the finishing material layer (C) is usually about 0.05 to 10 mm, although it depends on the type of finishing coating material. The finish coating material may be applied after the treatment liquid (K) is dried.
A clear paint or the like can be separately applied to the surface of the finish coating material layer (C) for the purpose of improving weather resistance, antifouling property and the like.

  In the case of providing the undercoat material layer, the finish coat material may be applied to the surface-treated inorganic heat insulating material after the undercoat material is applied. The undercoat material may be applied after the treatment liquid (K) is dried. In the application of the primer, a spray, a roller, a brush, a wrinkle or the like can be used. The thickness of the undercoat material layer is usually about 0.1 to 2 mm.

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

(Manufacture of processing liquid)
According to the formulation shown in Tables 2 and 3, each raw material was uniformly mixed by a conventional method to produce a treatment liquid. Among these, as the synthetic resin emulsion, a synthetic resin emulsion (resins 1 to 7) having a solid content of 40% by weight obtained by emulsion polymerization using the monomer composition shown in Table 1 was used. The monomers in Table 1 are as follows.
ST: Styrene MMA: Methyl methacrylate 2EHA: 2-ethylhexyl acrylate GMA: Glycidyl methacrylate AN: Acrylonitrile AAm: Acrylamide DAAm: Diacetone acrylamide MAA: Methacrylic acid

As raw materials other than the synthetic resin emulsion, those shown below were used.
Water-soluble silicate: Lithium silicate aqueous solution (Molar ratio of Li ₂ O and SiO ₂ 1: 3.5, solid content 24% by weight)
Surfactant 1: Nonionic surfactant (polyoxyethylene alkyl ether, HLB 14.0)
Surfactant 2: Nonionic surfactant (polyoxyethylene alkyl ether, HLB 11.7)
Solvent 1: 2,2,4-trimethyl-1,3-pentanediol monoisobutyrate (water solubility <1 g / 100 g)
Solvent 2: propylene glycol n-butyl ether (solubility in water 6 g / 100 g)

(Examples 1-13, Comparative Examples 1-3)
On one side of a slate plate (thickness 6 mm), a slurry obtained by kneading water into a lightweight mortar mainly composed of Portland cement and pearlite was applied and a lightweight mortar layer having a thickness of 20 mm was formed.
After 28 days from the application of the lightweight mortar, each treatment solution was applied to the surface of the lightweight mortar layer at a coating amount of 0.15 kg / m ² using a wool roller. Next, after 24 hours, an acrylic paint corresponding to JIS K5660 “Glossy Synthetic Resin Emulsion Paint” was applied as a finish coating material by spray coating so that the dry thickness was 0.1 mm, followed by curing for 14 days. The test plates were all prepared and cured in standard conditions (temperature 23 ° C., relative humidity 50%). The treatment solutions used in each example and comparative example are as shown in Tables 2 and 3.

・ Test 1
The test plate obtained by the above method was subjected to a cycle of immersing an infrared lamp (output 250 W) for 8 hours at a distance of 40 cm and then immersed in water at 23 ° C. for 16 hours. Appearance change was visually observed. The evaluation was performed in four stages (excellent: ◎>◯>Δ> ×) where “と す る” indicates that no abnormality was observed and “×” indicates that swelling or peeling was observed.

・ Test 2
The test plate obtained by the above method was immersed in a saturated calcium hydroxide aqueous solution (23 ° C.) for 10 days, and then the adhesion strength was measured using a tensile tester. Further, the adhesion strength of the test plate coated with the finish coating material without using the treatment liquid was measured by the same method, and the value of the adhesion strength was used as a reference value.
Evaluation of Test 2 is performed by calculating the magnification of the adhesion strength of each test plate with respect to the reference value, and “2.0” or more of the reference value is “◎”, 1.5 to 2.0 times. “O”, 1.1 times or more and less than 1.5 times are “Δ”, and less than 1.1 times are “x”.

The test results are shown in Tables 2 and 3.
In Examples 1-13, the favorable result was able to be obtained compared with Comparative Examples 2-3. In Comparative Example 1, since the treatment agent was unstable, the test could not be performed.

(Examples 14 to 17)
On one side of a slate plate (thickness 6 mm), a slurry obtained by kneading water into a lightweight mortar mainly composed of Portland cement and pearlite was applied and a lightweight mortar layer having a thickness of 20 mm was formed.
After the light mortar was applied for 28 days, the treatment liquid used in Example 11 was applied to the surface of the light mortar layer at a coating amount of 0.15 kg / m ² using a wool roller. Then, after 24 hours have elapsed, the undercoat material is spray-coated so that the dry thickness is 0.5 mm. After 24 hours, the finish coating material corresponds to “Synthetic resin emulsion-based thickening finish coating material” of JIS A6909. The coating material was spray-coated so that the dry thickness was about 2 mm and cured for 14 days. All test plates were prepared and cured under standard conditions.

In Examples 14 to 17, the following primer materials 1 to 4 were used, respectively.
Primer 1: Primer with elongation of 220% and pigment volume concentration of 48% (Acrylic resin emulsion (Tg: −10 ° C.), primer mainly composed of heavy calcium carbonate)
Primer 2: Primer with elongation of 230% and pigment volume concentration of 48% (light stabilizer composite acrylic resin emulsion (Tg: −10 ° C., light stabilizer: 4-methacryloyloxy-2,2,6,6- Tetramethylpiperidine (0.5% by weight in the resin component)), a base material mainly composed of heavy calcium carbonate)
Primer 3: Primer with elongation of 200% and pigment volume concentration of 48% (light stabilizer composite acrylic silicone resin emulsion (Tg: −12 ° C., light stabilizer: 4-methacryloyloxy-2,2,6,6) -Tetramethylpiperidine (0.5% by weight in the resin component)), undercoat material mainly composed of heavy calcium carbonate)
Primer 4: Primer with elongation of 40% and pigment volume concentration of 82% (Acrylic resin emulsion (Tg: −10 ° C.), primer mainly composed of heavy calcium carbonate)

  About the test board obtained by the above method, the test similar to the said test 1 and test 2 was done. The results are shown in Table 4.

(Reference Examples 1-4)
A cement-type inorganic molded board (length 150 × width 70 × thickness 6 mm) having a cut at the horizontal center was used as a test substrate. The treatment liquid used in Example 11 was applied to the test substrate at a coating amount of 0.15 kg / m ² using a wool roller. After 24 hours, the primer was spray-coated so that the dry thickness was about 0.5 mm, and then after 24 hours, the finish was spray-coated so that the dry thickness was about 2 mm, and cured for 14 days. . All test plates were prepared and cured under standard conditions. The upper and lower end portions 20 mm were not coated.
In Reference Examples 1 to 4, the above primer materials 1 to 4 were used, respectively.

  The test plate obtained by the above method was subjected to accelerated exposure for 5000 hours using a sunshine weather meter (manufactured by Suga Test Instruments Co., Ltd.), and then evaluated for followability using a tensile tester. The evaluation was “A” when no abnormality was observed when the test substrate was pulled 1 mm, “B” when no abnormality was observed when the test substrate was pulled 0.5 mm, and the test substrate. The case where cracks were observed when the wire was pulled 0.5 mm was designated as “C”, and the case where cracks were observed after accelerated exposure was designated as “D”. The results are shown in Table 5.

Claims (2)

It is a heat insulating structure that constitutes the outer wall surface of the building, from the indoor side to the outdoor side of the wall surface,
It has a base material layer (A), an inorganic heat insulating layer (B) formed by a lightweight mortar containing cement and a lightweight aggregate as essential components, and a finishing material layer (C) formed by a finishing coating material,
The inorganic heat insulating layer (B) has at least an outdoor surface thereof,
It contains an epoxy group-containing synthetic resin emulsion (m) and a water-soluble silicate (n), and the solid content weight ratio of the synthetic resin emulsion (m) and the water-soluble silicate (n) is 90:10 to 10: A heat-insulating structure characterized in that it is treated with a treatment liquid of 90. The synthetic resin emulsion (m) in the treatment liquid contains an epoxy group and at least one polar group selected from a nitrile group, an amide group, and a carbonyl group. Insulation structure.