Building heat insulation method, building heat insulation structure, adhesive, and surface protection material

Abstract

To avoid a deterioration of strength of insulation material.SOLUTION: The heat insulation method of an architectural structure comprises the steps for: fixing insulation material to a surface of a wall substrate provided at the architectural structure; and forming a surface protective layer on a surface of the insulation material. The surface protective layer is formed by a surface protective material having pH equal to or less than 10. Further, the heat insulation structure overlapped on the wall substrate of the architectural structure comprises a heat insulation layer and the surface protective layer in this order from the wall substrate side, the surface protective layer consisting of material having pH equal to or less than 10.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The technology disclosed by this specification relates to a heat insulation method for buildings, a heat insulation structure for buildings, an adhesive, and a surface protection material.

Background Art

[0002] Conventionally, as a heat insulation method used for the inner wall or outer wall of a building, for example, an adhesive is applied to one side of a heat insulation material made of corrugated rock wool having a compressive strength of 18 KPa (JIS K 7220) or more on the outer wall of the building body and adhered and fixed to the outer wall surface, a base mortar mixed with water-soluble cellulose is applied to the surface of the corrugated rock wool heat insulation material, and a coating-type outer wall finishing is performed on the mortar layer (see Patent Document 1); or after attaching a heat insulation material to the outer surface of the building body with a foaming adhesive, a mortar containing short fibers is plastered on the surface of the heat insulation material, and a net is overlaid thereon (see Patent Document 2); or on the outside where a self-extinguishing phenolic heat insulation material is disposed on the base of the building, a waterproof paper and an iron net, or an iron net with a waterproof paper are attached, lightweight cement mortar is applied, and after pressing and embedding a net material on the surface or inside thereof, finishing construction is performed (see Patent Document 3); or a base mortar is applied to the front surface of a heat insulation panel through a reinforcing mesh made of alkali-resistant glass fiber, and further a wet coating finish is applied (see Patent Document 4), etc.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Patent Document 2

Patent Document 3

Patent Document 4

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, when an alkaline material such as cement mortar or plaster is applied to the surface of the heat insulating material, there is a problem that the surface strength of the heat insulating material decreases due to long-term exposure or the like.

Means for Solving the Problem

[0005] The heat insulation method for a building disclosed by this specification includes a step of fixing a heat insulating material to the surface of a wall base provided in the building, and a step of forming a surface protection layer on the surface of the heat insulating material, and the surface protection layer is formed of a surface protection material having a pH of 10 or less.

[0006] In addition, the heat insulation structure of a building disclosed by this specification is a heat insulation structure of a building that is overlaid on a wall base of the building, and includes a heat insulation layer and a surface protection layer in this order from the wall base side, and the surface protection layer is composed of a material having a pH of 10 or less.

Effect of the Invention

[0007] According to the heat insulation method and heat insulation structure of a building disclosed by this specification, a decrease in the strength of the heat insulating material can be avoided.

Brief Description of the Drawings

[0008]

Figure 1

Figure 2

Figure 3

Mode for Carrying Out the Invention

[0009] The embodiment will be described with reference to FIG. 1.

[0010] [Heat insulation structure 1 of building] The heat insulation structure 1 of the building in the embodiment is a heat insulation structure that is overlaid on a wall base 16 provided in a building such as a house, and includes an adhesive layer 11, a heat insulation layer 12, a surface protection layer 13, and a finishing layer 15 in this order from the wall base 16 side, and also includes a reinforcing mesh 14 embedded in the surface protection layer 13.

[0011] As the heat insulating material constituting the heat insulation layer 12, a phenolic resin foam is used. The phenolic resin foam is a foam obtained by mixing a foaming agent and a curing agent with a phenolic resin and foaming and curing it. The phenolic resin foam is generally formed by foaming and curing a foaming resin composition discharged onto a traveling facing material.

[0012] An example of the manufacturing method of the phenolic resin foam is as follows.

[0013] As the phenolic resin, a resol type phenolic resin is synthesized, the moisture content is adjusted, and then a surfactant is added. This phenolic resin, a foaming agent, and an acid catalyst are mixed with a mixer, and continuously discharged onto a facing material made of a polyester non-woven fabric with a basis weight of 30 g / m 2 and further covered with the same polyester non-woven fabric facing material on it to form a continuous laminate. Then, this continuous laminate is sandwiched and passed between double conveyors set at a predetermined temperature to be foam-cured to obtain a phenolic resin foam.

[0014] When using the phenolic resin foam thus formed as a heat insulating material, it may be used with the facing material overlaid on the surface of the foam.

[0015] This phenolic resin foam is excellent in heat insulation, heat resistance, and flame retardancy, but is inferior in alkali resistance. Therefore, the adhesive layer 11 and the surface protection layer 13 in contact with the heat insulation layer 12 need to be composed of materials with a pH of 10 or less, and more preferably composed of materials with a pH of 6 or more and 9 or less. When the pH is within this range, hydrolysis of the phenolic resin foam can be suppressed and the surface strength can be maintained.

[0016] [Building Thermal Insulation Method] The building thermal insulation method for obtaining the thermal insulation structure 1 as described above includes an adhesion step of adhering a thermal insulation material to the surface of the wall base 16 via an adhesive, a surface protection step of forming a surface protection layer 13 on the surface of the thermal insulation material and embedding a reinforcing mesh 14, and a finishing step of forming a finishing layer 15 on the surface of the surface protection layer 13.

[0017] In the adhesion step, after applying an adhesive to the surface of the wall base 16, the thermal insulation material is overlapped on the applied adhesive, and the adhesive is dried and cured. In this way, the adhesion of the thermal insulation material to the wall base 16 is completed.

[0018] After the completion of the adhesion step, the surface protection step is performed. The surface protection material is applied to the surface of the thermal insulation material with a plasterer's trowel or the like. Subsequently, before the applied surface protection material dries and solidifies, the reinforcing mesh 14 is embedded while being pressed with a plasterer's trowel. Next, the surface protection material is further applied on the surface. Then, the surface protection material is dried and solidified to form the surface protection layer 13 in which the reinforcing mesh 14 is embedded. In this way, the formation of the surface protection layer 13 is completed. It is preferable to apply the surface protection material after attaching a waterproof tape such as a polyethylene tape to the joint between the phenolic resin foams.

[0019] After the completion of the surface protection step, the finishing step is performed. A surface finishing material is applied to the surface of the surface protection layer 13, dried and cured to form the finishing layer 15. The finishing layer 15 imparts designability to the wall surface.

[0020] <Adhesive> The adhesive that constitutes the adhesive layer 11 and adheres the thermal insulation material to the wall base 16 needs to have a pH of 10 or less, and more preferably a pH of 6 or more and 9 or less. When the pH is within this range, hydrolysis of the phenolic resin foam can be suppressed and the surface strength can be maintained.

[0021] The adhesive contains a first synthetic resin emulsion, and the first synthetic resin emulsion preferably contains first copolymer particles obtained by emulsion polymerization of a monomer mixture containing a carboxyl group-containing vinyl monomer, a nitrile group-containing vinyl monomer, and one or more monomers selected from the group consisting of an aromatic vinyl monomer, an alkyl methacrylate monomer, an alkyl acrylate monomer, and a hydroxyl group-containing vinyl monomer. As the first synthetic resin emulsion, for example, an acrylic resin emulsion can be used.

[0022] By using a carboxyl group-containing vinyl monomer, the adhesiveness of the resulting adhesive is more excellent. The carboxyl group-containing vinyl monomer is not particularly limited, and examples thereof include acrylic acid, methacrylic acid, maleic acid or its monoester, fumaric acid or its monoester, itaconic acid or its monoester, and the like. Among these, acrylic acid, methacrylic acid, and itaconic acid are preferable. The content of the carboxyl group-containing vinyl monomer with respect to 100% by mass of all the monomers constituting the copolymer resin is preferably 0.1 to 10.0% by mass, more preferably 0.1 to 5.0% by mass, and still more preferably 0.3 to 2.0% by mass. When the carboxyl group-containing vinyl monomer is 0.1% by mass or more, the adhesiveness of the resulting adhesive layer 11 is more excellent. Further, when the content is 10% by mass or less, the water resistance is excellent.

[0023] By using a nitrile group-containing vinyl monomer, the adhesiveness and the followability to the substrate of the adhesive are excellent. The nitrile group-containing vinyl monomer is not particularly limited, and examples thereof include acrylonitrile and methacrylonitrile. Among these, acrylonitrile is preferable. The content of the nitrile group-containing vinyl monomer with respect to 100% by mass of all the monomers constituting the copolymer resin is preferably 0.5 to 20.0% by mass, more preferably 1.0 to 10.0% by mass, and still more preferably 2.0 to 7.0% by mass. When the nitrile group-containing vinyl monomer with respect to 100% by mass of all the monomers constituting the copolymer resin is 0.5% by mass or more, the adhesiveness and the followability to the substrate of the adhesive are more excellent.

[0024] One or more monomers selected from aromatic vinyl monomers, alkyl methacrylate monomers, alkyl acrylate monomers, and vinyl monomers containing a hydroxyl group can be used. The content of these monomers relative to 100% by mass of all the monomers constituting the copolymer resin is preferably 69.1 to 99.35% by mass.

[0025] The aromatic vinyl monomer is not particularly limited, and examples thereof include styrene, vinyltoluene, divinylbenzene, and the like. Among these, styrene is preferably used.

[0026] The alkyl methacrylate monomer is not particularly limited, and examples thereof include methyl methacrylate, ethyl methacrylate, propyl methacrylate, isopropyl methacrylate, butyl methacrylate, isobutyl methacrylate, hexyl methacrylate, cyclohexyl methacrylate, 2-ethylhexyl methacrylate, lauryl methacrylate, and the like. Among these, methyl methacrylate is preferably used.

[0027] The alkyl acrylate monomer is not particularly limited, and examples thereof include methyl acrylate, ethyl acrylate, propyl acrylate, isopropyl acrylate, butyl acrylate, isobutyl acrylate, hexyl acrylate, cyclohexyl acrylate, 2-ethylhexyl acrylate, lauryl acrylate, and the like. Among these, butyl acrylate and 2-ethylhexyl acrylate are preferably used.

[0028] The hydroxyl group-containing vinyl monomer is not particularly limited. For example, 2-hydroxyethyl acrylate, 2-hydroxyethyl methacrylate, 2-hydroxypropyl acrylate, 2-hydroxypropyl methacrylate, polyethylene glycol acrylate, and polyethylene glycol methacrylate; methylol group-containing monomers such as N-methylolacrylamide, N-methylolmethacrylamide, dimethylolacrylamide, and dimethylolmethacrylamide can be mentioned. Among these, 2-hydroxyethyl acrylate and 2-hydroxyethyl methacrylate are preferred.

[0029] The first copolymer particles preferably have a multilayer structure having a core part and a shell part. The "multilayer structure" means that the copolymer in the outermost shell part of the particle is the shell part, the copolymer inside the shell part is the core part, and the monomer compositions in the core part and the shell part are different. Note that the core part may have a multilayer structure including layers with different monomer compositions.

[0030] The first copolymer particles preferably contain only the carboxyl group-containing vinyl monomer in the core part. Thereby, the formed adhesive layer 11 is excellent in water resistance.

[0031] The calculated glass transition temperature of the copolymer resin constituting the core part is preferably -30°C or lower, more preferably -35°C or lower, and even more preferably -40°C or lower. The lower limit of the calculated glass transition temperature of the copolymer resin constituting the core part is not particularly limited, but is preferably -70°C or higher. When the calculated glass transition temperature of the copolymer in the core part is -30°C or lower, cracking of the resulting adhesive is prevented, and the followability to the substrate tends to be more excellent.

[0032] The calculated glass transition temperature of the copolymer resin constituting the shell part is preferably -50 to 20°C, more preferably -40 to 20°C, and even more preferably -35 to -15°C. When the calculated glass transition temperature of the copolymer in the shell part is -50 to 20°C, the followability of the resulting adhesive to the substrate also tends to be more excellent.

[0033] The "calculated glass transition temperature of the copolymer" can be calculated by the following formula (1) from the glass transition temperature of the homopolymer of the monomer and the copolymerization ratio of the monomers.

[0034] 1 / Tg = W1 / Tg1 + W2 / Tg2 + … (1) Tg: Calculated glass transition temperature (K) of the copolymer composed of monomers 1, 2, … W1, W2, …: Mass fractions of monomer 1, monomer 2, … Here, W1 + W2 + … = 1 Tg1, Tg2, …: Glass transition temperatures (K) of the homopolymers of monomer 1, monomer 2, …

[0035] The glass transition temperature (K) of the homopolymer of the monomer used for the calculation is not particularly limited. For example, the values described in the Polymer Handbook (John Willey & Sons) can be adopted.

[0036] In addition to the first synthetic resin emulsion, the adhesive may contain, for example, aggregates, drying regulators, tackifiers, defoamers, dispersants, thickeners, preservatives, pH adjusters, etc.

[0037] As the aggregate, for example, cold water sand, silica sand, etc. can be used.

[0038] Examples of the drying regulator include glycols such as ethylene glycol, propylene glycol, polyethylene glycol, and surfactants.

[0039] Examples of the tackifier include terpene resin, xylene resin, synthetic rubber, etc.

[0040] Examples of the pH adjuster include aqueous ammonia, aqueous sodium hydroxide solution, water-soluble amines, etc.

[0041] Since the adhesive layer 11 formed by the adhesive configured as described above has waterproof properties, by forming the adhesive layer 11 so as to cover the entire surface of the wall base 16, waterproof properties can be imparted to the entire surface of the wall base 16.

[0042] Preferred composition examples of the adhesive are shown in Table 1.

[0043]

Table 1

[0044] <Surface protective material> The surface protective material constituting the surface protective layer 13 needs to have a pH of 10 or less, and more preferably a pH of 6 or more and 9 or less. When the pH is within this range, hydrolysis of the phenolic resin foam can be suppressed and the surface strength can be maintained.

[0045] The surface protective material preferably contains a second synthetic resin emulsion and an aggregate. The second synthetic resin emulsion preferably contains second copolymer particles having a multilayer structure having a core part and a shell part.

[0046] The second synthetic resin emulsion preferably contains second copolymer particles obtained by emulsion polymerization of a monomer mixture containing 95% by mass or more of a monomer having a water solubility of less than 0.5 g / 100 g of water, 0.1% by mass or more and less than 1.0% by mass of an alkoxysilane group-containing monomer, and a reactive surfactant. As the second synthetic resin emulsion, for example, an acrylic resin emulsion can be used.

[0047] Monomers with a solubility in water of less than 0.5 g per 100 g of water include styrene (0.03 g), cyclohexyl methacrylate (0.01 g or less), n-butyl methacrylate (0.04 g), t-butyl methacrylate (0.05 g), i-butyl methacrylate (0.04 g), 2-ethylhexyl methacrylate (0.01 or less), lauryl methacrylate (0.01 g or less), n-butyl acrylate (0.20 g), 2-ethylhexyl acrylate (0.01 g), and the like. These may be used alone or in combination of two or more. From the viewpoints of water resistance and various chemical resistances, it is preferable to include styrene or cyclohexyl methacrylate as the monomer, and it is more preferable to include both styrene or cyclohexyl methacrylate and 2-ethylhexyl acrylate.

[0048] From the viewpoint of water resistance, the content of styrene or cyclohexyl methacrylate in 100% by mass of the monomer mixture is preferably 30% by mass or more, more preferably 40% by mass or more. Further, from the viewpoint of film-forming property, it is preferably 60% by mass or less, more preferably 50% by mass or less.

[0049] By containing an alkoxysilane group-containing monomer, the crosslinking degree of the polymerized resin can be adjusted to an appropriate range and the film-forming property becomes good. Therefore, it is possible to prevent the formation of defects in the surface protective layer 13, and thus the surface protective layer 13 has excellent waterproof properties.

[0050] From the viewpoints of the water resistance and sulfuric acid resistance of the surface protective layer 13, the content ratio of the alkoxysilane group-containing monomer with respect to the total amount (100% by mass) of the monomer mixture used in emulsion polymerization is preferably 0.1 to 2.0% by mass, more preferably 0.2 to 1.5% by mass, and most preferably 0.3 to 1.2% by mass.

[0051] Examples of the alkoxysilane group-containing monomer include vinyltrimethoxysilane, vinyltriethoxysilane, vinyltris(β-methoxyethoxy)silane, vinylmethyldimethoxysilane, γ-methacryloxypropyltrimethoxysilane, γ-methacryloxypropylmethyldimethoxysilane, γ-acryloxypropyltrimethoxysilane, γ-acryloxypropylmethyldimethoxysilane, γ-methacryloxypropyltriethoxysilane, and γ-methacryloxypropylmethyldiethoxysilane. These may be used alone or in combination of two or more. Among these, γ-methacryloxypropyltrimethoxysilane, γ-methacryloxypropylmethyldimethoxysilane, γ-methacryloxypropyltriethoxysilane, and γ-methacryloxypropylmethyldiethoxysilane are preferred. Among these, γ-methacryloxypropyltrimethoxysilane and γ-methacryloxypropyltriethoxysilane are more preferred.

[0052] In the present embodiment, the monomer mixture may contain a polymerizable monomer having a water solubility of less than 0.5 g / 100 g of water and other polymerizable monomers copolymerizable with the alkoxysilane group-containing polymerizable monomer. Examples of the other polymerizable monomers include, but are not limited to, (meth)acrylic acid esters, hydroxyl group-containing polymerizable monomers, carboxylic acid group-containing polymerizable monomers, and other polymerizable monomers.

[0053] When polymerizing the second synthetic resin emulsion, it is preferable to use a reactive surfactant. By using a reactive surfactant, the waterproof property of the surface protective layer 13 is excellent. The reactive surfactant is not particularly limited as long as it is a surfactant having polymerization activity. For example, a reactive anionic surfactant or a reactive nonionic surfactant can be used. Specific examples of the reactive anionic surfactant include, but are not limited to, "ADEKA LIA SOAP SE-1025A", "ADEKA LIA SOAP SR-1025", "ADEKA LIA SOAP SR-3025" (manufactured by ADEKA Corporation), "AQUALON KH-1025", "AQUALON HS-1025", "AQUALON BC-1025", "AQUALON BC-2020" (manufactured by Dai-ichi Kogyo Seiyaku Co., Ltd.), "LATEMUL PD-104" (manufactured by Kao Corporation), "ELEMINOL JS-20", "ELEMINOL RS-3000" (manufactured by Sanyo Chemical Industries, Ltd.), and the like. Specific examples of the reactive nonionic surfactant include, but are not limited to, "ADEKA LIA SOAP ER-10", "ADEKA LIA SOAP ER-20", "ADEKA LIA SOAP ER-30", "ADEKA LIA SOAP ER-40", "ADEKA LIA SOAP NE-10", "ADEKA LIA SOAP NE-20", "ADEKA LIA SOAP NE-30" (manufactured by ADEKA Corporation), "AQUALON RN-20", "AQUALON RN-30", "AQUALON RN-50" (manufactured by Dai-ichi Kogyo Seiyaku Co., Ltd.), and the like.

[0054] The calculated glass transition temperature of the second synthetic resin emulsion is preferably 0 to -30°C, more preferably -10 to -20°C. The calculated glass transition temperature can be calculated by the above formula (1).

[0055] Table 2 shows the water solubility of typical monomers and the glass transition temperature (Tg) of the homopolymers.

[0056]

Table 2

[0057] By controlling the fusion of the copolymer particles of the second synthetic resin emulsion, it is possible to achieve both the waterproof property and the water vapor permeability of the surface protective layer 13, which should originally be contradictory. As the control method, there are a method of crosslinking during emulsion polymerization (including a monomer containing an alkoxysilane group) and a method of forming a multilayer structure having a core part and a shell part for the copolymer particles.

[0058] When crosslinking during emulsion polymerization (including a monomer containing an alkoxysilane group), when the copolymer particles have a single-layer structure, the content of the monomer containing an alkoxysilane group is preferably 0.7 to 1.5% by mass, and more preferably 0.8 to 1.2% by mass. When forming a multilayer structure, the content of the monomer containing an alkoxysilane group in the core part is preferably 0.1 to 0.5% by mass, and more preferably 0.2 to 0.4% by mass.

[0059] When the second copolymer particles have a multilayer structure having a core part and a shell part, the calculated glass transition temperature of the copolymer particles constituting the core part is preferably -10°C or lower, more preferably -15°C or lower, and even more preferably -20°C or lower. The calculated glass transition temperature of the copolymer resin constituting the shell part is preferably 30 to 120°C, more preferably 40 to 100°C, and even more preferably 50 to 85°C.

[0060] The mass ratio of the core part of the second synthetic resin emulsion is preferably 60 to 95% by mass, and more preferably 70 to 90% by mass.

[0061] As the aggregate, for example, cold water sand, silica sand, calcium carbonate, etc. can be used. The average particle diameter of the aggregate is preferably 50 to 150 μm, and more preferably 70 to 110 μm.

[0062] In addition to the second synthetic resin emulsion and the aggregate, the surface protective material may contain, for example, short fibers, film-forming aids, defoamers, dispersants, thickeners, preservatives, pH adjusters, etc.

[0063] Examples of the short fibers include nylon fibers, acrylic fibers, vinylon fibers, carbon fibers, and the like.

[0064] Examples of the pH adjuster include aqueous ammonia, aqueous sodium hydroxide solution, water-soluble amine, and the like.

[0065] Design properties may be imparted by coloring the surface protective material. Also, design properties may be imparted by mixing colored silica sand into the surface protective material.

[0066] A preferred composition example of the surface protective material is shown in Table 3.

[0067]

Table 3

[0068] <Reinforcing mesh 14> The reinforcing mesh 14 is formed using glass fibers, alkali-resistant glass fibers, aramid fibers, vinylon fibers, nylon fibers, and the like. The mesh opening of the reinforcing mesh 14 is preferably 3 to 8 mm. When it is in this range, the impact resistance of the surface protective layer 13 is excellent.

[0069] <Surface finishing material> As the surface finishing material constituting the coating layer 15, it is preferable to use a synthetic resin emulsion having the same composition as the surface protective material. The surface finishing material is not particularly limited, and commercially available products for interior and exterior decoration of buildings can be used.

[0070] [Test example] 1. Materials 1) Phenolic resin foam As the phenolic resin foam, "Neoform (registered trademark)" of Asahi Kasei Building Materials Corporation was used.

[0071] 2) Adhesive As the adhesive, one having the following composition was used. · Adhesive A (pH = 8.5) Water: 10 parts by mass Acrylic resin emulsion (product name: "Polytoron", manufactured by Asahi Kasei Corporation, solid content 45%): 400 parts by mass Cold water sand: 160 parts by mass Silica sand: 55 parts by mass Ethylene glycol: 50 parts by mass Xylene resin: 40 parts by mass Film-forming aid: 5 parts by mass Defoaming agent: 2 parts by mass Dispersant: 8 parts by mass Thickener: 1 part by mass Preservative: 1 part by mass 25% Ammonia water: 1 part by mass · Adhesive B (pH = 7) Acrylic resin emulsion (product name: "Polytoron", manufactured by Asahi Kasei Corporation, solid content 45%): 450 parts by mass Silica sand: 200 parts by mass Ethylene glycol: 20 parts by mass Defoaming agent: 2 parts by mass Dispersant: 5 parts by mass Thickener: 1 part by mass Preservative: 1 part by mass 25% Ammonia water: 1.5 parts by mass · Adhesive C (pH = 13) Water: 100 parts by mass Ordinary Portland cement: 50 parts by mass Silica sand: 100 parts by mass Thickener: 2 parts by mass

[0072] 3) Surface protective material As the surface protective material, the one with the following composition was used. · Surface protective material a (pH = 9) Water: 100 parts by mass Acrylic resin emulsion (product name: "Polydurex", manufactured by Asahi Kasei Corporation, solid content 55%): 600 parts by mass Silica sand: 1000 parts by mass Acrylic fiber: 5 parts by mass Propylene glycol: 10 parts by mass Film-forming aid: 10 parts by mass Dispersant: 4 parts by mass Thickener: 10 parts by mass Antiseptic: 0.2 parts by mass Water-soluble amine: 0.5 parts by mass · Surface protective material b (pH = 13) Water: 120 parts by mass Ordinary Portland cement: 50 parts by mass Cold water sand: 150 parts by mass Thickener: 2 parts by mass · Surface protective material c (pH = 11) Water: 100 parts by mass Fired dolomite: 50 parts by mass Silica sand: 120 parts by mass Thickener: 2 parts by mass

[0073] 2. Preparation of test specimens After laminating a phenolic resin foam (product name "Neoform", manufactured by Asahi Kasei Building Materials Corporation) to a plywood using an adhesive, a surface protective material was applied and cured for 2 weeks to obtain test specimens. The combinations of the adhesive and the surface protective material are shown in Table 4 below.

[0074] 3. Test method An adhesion strength test (in the standard state and after immersion) was conducted in accordance with JIS A 6909.

[0075] 4. Results The results are shown in Table 4. In Table 4, those with an adhesion strength exceeding 0.7 N / mm 2 are marked as ○, those with an adhesion strength of 0.5 N / mm 2 or more and 0.7 N / mm 2 or less are marked as △, and those with an adhesion strength less than 0.5 N / mm 2 are marked as ×. Regarding the fracture location during the adhesion test, those where the phenolic resin foam underwent cohesive failure are marked as ○, and those where the facing material of the phenolic resin foam peeled off are marked as ×.

[0076]

Table 4

[0077] In Test Examples 1 and 2 where both the adhesive and the surface protective material have a pH of 10 or less, in any of the adhesion strength tests in the standard state and after immersion, the adhesion strength is 0.7 N / mm2 exceeded this value, indicating good adhesion strength. Regarding the fracture location, the phenolic resin foam had cohesive failure. On the other hand, in Test Examples 3, 4, 5, and 6 where one or both of the adhesive and the surface protective material had a pH greater than 10, the adhesion strength in the adhesion strength test under standard conditions exceeded 0.7 N / mm 2 However, in the adhesion strength test after immersion, the adhesion strength was 0.7 N / mm 2 or less, indicating a decrease in adhesion strength. Regarding the fracture location, the facing material of the phenolic resin foam was peeled off.

[0078] 5. Water Permeability Test The surface protective material was applied to the base material, and a water permeability test was conducted.

[0079] 1) Preparation of Specimen As shown in FIG. 2, two sets of three wooden substrates B1, B2, and B3 arranged side by side were attached back to back to wooden prisms P1, P2, P3, P4, and P5. The substrate B2 arranged in the middle has a trapezoidal portion that protrudes upward from the substrates B1 and B3 at both ends. The width W1 of the substrates B1 and B3 is 272.5 mm, the width W1 of the substrate B2 is 300 mm, the height H1 of the substrates B1 and B3 is 300 mm, the height H2 of the substrate B2 is 400 mm, the length W3 of the upper side of the substrate B2 is 90 mm, and the distance W4 from the end of the upper side of the substrate B2 to the side edge is 105 mm.

[0080] As shown in FIG. 3, the surface protective material was applied to the surfaces of the substrates B1, B2, and B3 and cured for two weeks to form a surface protection layer 13T, which was used as the specimen. As the surface protective material, the above-mentioned surface protective materials a and b were used.

[0081] 2) Test Method A load was applied from above to the substrate B2 of the specimen using a compression testing machine and displaced downward as shown by the two-dot chain line in FIG. 2. The displacement amount was set to 5 mm or 10 mm. A water permeability test instrument was attached to the surface protection layer 13T on the substrate B2 after displacement in accordance with JIS A 6909, and a water permeability test was conducted. When the amount of water permeated after 24 hours was 1 ml or less, it was evaluated as ○, when it was 5 ml or less, it was evaluated as △, and when it exceeded 5 ml, it was evaluated as ×.

[0082] 3) Results Table 5 shows the combinations of the surface protective materials used and the displacement amounts, as well as the test results.

[0083]

Table 5

[0084] In Test Examples 7 and 8 using Surface Protective Material a, the water penetration amount after 24 hours was 1 ml or less regardless of whether the displacement amount was 5 mm or 10 mm. On the other hand, in Test Examples 9 and 10 using Surface Protective Material b, the water penetration amount after 24 hours was 5 ml or more regardless of whether the displacement amount was 5 mm or 10 mm.

[0085] By applying a load to the base material B2 to cause displacement, a shearing force is applied to the surface protective layer 13T. Even in a state where such a shearing force is applied, it has been shown that the waterproof property is maintained when using Surface Protective Material a.

[0086] <Other Embodiments> (1) In the above embodiment, the heat insulating material was adhered to the surface of the wall base via an adhesive, but the heat insulating material may be fixed to the wall base by, for example, screws or the like. (2) The adhesive and the surface protective material are preferably used for heat insulating materials using phenolic resin foam, but are not limited thereto. For example, they can also be used for heat insulating materials using styrene resin foams such as EPS and XPS, and inorganic fiber bodies such as rock wool and glass wool. In any case, an outer wall structure excellent in deformation stability can be obtained.

Explanation of Reference Numerals

[0087] 1…Heat insulation structure of building 11…Adhesive layer 12…Heat insulation layer 13, 13T…Surface protective layer 16…Wall base

Claims

1. A step of fixing a thermal insulation material to a surface of a wall base provided in a building; and forming a surface protective layer on the surface of the thermal insulation material. The surface protective layer is formed of a surface protective material having a pH of 10 or less, The surface protective layer is formed by applying a surface protective material to a surface of the heat insulating material, the surface protective material includes a second synthetic resin emulsion, the second synthetic resin emulsion contains second copolymer particles; The second copolymer particles are 95% by mass or more of a monomer having a water solubility of less than 0.5 g / 100 g of water; 0.1% by mass or more and less than 1.0% by mass of an alkoxysilane group-containing monomer; A method for insulating buildings, comprising emulsion polymerization of a monomer mixture containing a reactive surfactant, the monomer mixture being copolymer particles.

2. 2. The method of claim 1, wherein the insulating material is a phenolic foam.

3. 3. The method for insulating a building according to claim 1, wherein the insulating material is fixed to the surface of the wall base by an adhesive having a pH of 10 or less.

4. the adhesive comprises a first synthetic resin emulsion; The first synthetic resin emulsion comprises: A carboxyl group-containing vinyl monomer, a nitrile group-containing vinyl monomer; and one or more monomers selected from the group consisting of an aromatic vinyl monomer, a methacrylic acid alkyl ester monomer, an acrylic acid alkyl ester monomer, and a hydroxyl group-containing vinyl monomer. the first copolymer particle has a multilayer structure having a core portion and a shell portion, The thermal insulation method for a building according to claim 3, wherein the carboxyl group-containing vinyl monomer is contained only in the core portion.

5. The surface protective layer is formed by applying a surface protective material to a surface of the heat insulating material, The surface protective material includes a second synthetic resin emulsion and an aggregate, the second synthetic resin emulsion contains second copolymer particles; the second copolymer particle has a multilayer structure having a core portion and a shell portion, The method for insulating a building according to any one of claims 1 to 4, wherein the aggregate contains at least one of silica sand and Kansui sand.

6. A thermal insulation structure for a building that is superimposed on the wall substrate of the building, A heat insulating layer and a surface protective layer are provided in this order from the wall base side, the surface protective layer is made of a material having a pH of 10 or less, the surface protective material constituting the surface protective layer contains a second synthetic resin emulsion, the second synthetic resin emulsion contains second copolymer particles; The second copolymer particles are 95% by mass or more of a monomer having a water solubility of less than 0.5 g / 100 g of water; 0.1% by mass or more and less than 1.0% by mass of an alkoxysilane group-containing monomer; and a reactive surfactant.

7. An adhesive used in the thermal insulation method for buildings according to claim 3, A first synthetic resin emulsion is included, The first synthetic resin emulsion comprises: A carboxyl group-containing vinyl monomer, a nitrile group-containing vinyl monomer; and one or more monomers selected from the group consisting of an aromatic vinyl monomer, a methacrylic acid alkyl ester monomer, an acrylic acid alkyl ester monomer, and a hydroxyl group-containing vinyl monomer. the first copolymer particle has a multilayer structure having a core portion and a shell portion, The adhesive contains the carboxyl group-containing vinyl monomer only in the core portion.

8. In the thermal insulation method for a building according to claim 1, a surface protective material constituting the surface protective layer, A second synthetic resin emulsion and an aggregate, the second synthetic resin emulsion contains second copolymer particles having a multilayer structure having a core portion and a shell portion, A surface protection material, wherein the aggregate comprises at least one of silica sand and kansui sand.

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