Vacuum insulation installation structure

Abstract

To provide an attachment structure of a vacuum heat insulation material which can reduce the flow-in of a gas to the vacuum heat insulation material in such a highly-relative humidified state that a dew condensation is generated.SOLUTION: An attachment structure 1 of a vacuum heat insulation material includes: the vacuum heat insulation material 3 being the vacuum heat insulation material 3 including a gas barrier layer being a resin layer including a vinyl group except for a polyvinyl alcohol, an armor film 4 including the gas barrier, and a core material 5 covered with the armor film 4; an outer wall 2 of a bundling attached with the vacuum heat insulation material 3; an adhesion member 6 interposed between the outer wall 2 and the vacuum heat insulation material 3, and making both the outer wall and the vacuum heat insulation material adhere to each other; and a ventilation part arranged between the outer wall 2 and the vacuum heat insulation material 3 together with the adhesion member 6, and allowing the circulation of air.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a mounting structure for vacuum insulation material that prevents the deterioration phenomenon specific to vacuum insulation material from occurring. [Background technology]

[0002] To achieve a thermal insulation effect for the inside of a building, vacuum insulation materials are arranged on the exterior walls. This vacuum insulation material is formed by covering a core material made of a porous body, glass wool, or the like with a film. By covering it with a film with gas barrier properties, the internal vacuum is maintained. Conventionally, this film has been formed with a multi-layer structure, and a layer made of aluminum foil (aluminum layer) has been arranged (see, for example, Patent Document 1). Therefore, the core material is covered with a film containing this aluminum layer.

[0003] Since aluminum has high thermal conductivity, heat easily moves through the aluminum layer, meaning that if an aluminum layer is used as part of the film, it is difficult to maintain its thermal insulation performance.

[0004] In recent years, a layer using EVOH resin (ethylene-vinyl alcohol copolymer resin) has been used as part of the film. This EVOH resin has particularly high performance in preventing the permeation of oxygen and nitrogen, and by evaporating aluminum onto it, which prevents the permeation of gases including water vapor, a film with high gas barrier performance and which is also resistant to heat can be obtained.

[0005] However, EVOH resin has a tendency to lose its gas barrier properties in high relative humidity environments, and even if a layer is formed by depositing aluminum onto EVOH resin, it is difficult to maintain the gas barrier properties in high relative humidity environments. Because vacuum insulation materials are attached to the exterior walls of buildings, where temperature changes are very large, there is a risk that gases including water vapor will pass through the film in high relative humidity environments due to temperature changes, making it impossible to maintain the vacuum and resulting in a decrease in insulation performance. Furthermore, the inflow of gas into the interior will cause a deterioration in the performance of the vacuum insulation material, which is designed to perform only when a vacuum is maintained inside. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] JP 2009-092224 A Summary of the Invention [Problem to be solved by the invention]

[0007] The present invention has been made in consideration of the above-mentioned conventional technology, and aims to provide a mounting structure for vacuum insulation material that can reduce the permeability of gases including water vapor under high relative humidity conditions in which condensation occurs. [Means for solving the problem]

[0008] In order to achieve the above-mentioned object, the present invention provides a mounting structure for a vacuum insulation material, the mounting structure comprising a vacuum insulation material including a gas barrier layer which is a resin layer containing a vinyl group excluding polyvinyl alcohol, an exterior film including the gas barrier layer, and a core material covered by the exterior film; an exterior wall of a building to which the vacuum insulation material is attached; an adhesive member interposed between the exterior wall and the vacuum insulation material and bonding them together; and a ventilation section which is arranged together with the adhesive member between the exterior wall and the vacuum insulation material and allows air to flow.

[0009] Preferably, the exterior film includes an alumina-deposited layer made of a resin on which alumina has been deposited.

[0010] Preferably, the adhesive member is formed so as to cover an area of ​​30% or less of the area of ​​the mounting surface of the vacuum insulation material to the outer wall.

[0011] Preferably, the adhesive member has a thickness of 1 mm or more.

[0012] Preferably, the adhesive member is linear and extends in the vertical direction. Effect of the Invention

[0013] According to the present invention, a vent is formed between the vacuum insulation material and the outer wall, and air flows through the vent, thereby preventing a high relative humidity state that would cause condensation. Therefore, the deterioration of the gas barrier property of the film in a high relative humidity environment can be suppressed, and it is possible to prevent a gas containing water vapor from penetrating the exterior film of the vacuum insulation material and reducing the degree of vacuum inside the vacuum insulation material. In particular, since the gas barrier property of the gas barrier layer is weak in a high relative humidity environment, this mounting structure can be said to be suitable for a vacuum insulation material that is intended to be covered with such an exterior film.

[0014] Furthermore, by including an alumina vapor deposition layer in the exterior film, it is possible to prevent the permeation of gases containing water vapor. That is, since the alumina vapor deposition has gas barrier properties against gases containing water vapor, it is possible to prevent the permeation of gases containing water vapor in combination with the ventilation part.

[0015] Furthermore, by forming the adhesive member so that it occupies 30% or less of the area of ​​the mounting surface, the area of ​​the ventilation section exceeds 70% of the area of ​​the mounting surface, thereby ensuring an area for greater air flow and preventing high relative humidity conditions that could cause condensation.

[0016] Furthermore, if the thickness of the adhesive member is 1 mm or more, the height of the ventilation section is ensured, making it possible to ensure an area for air flow and preventing high relative humidity conditions that would cause condensation.

[0017] In addition, because the adhesive member is linear and formed vertically, the ventilation section is also formed vertically, and therefore the air flow is also vertical. Air flow is caused by temperature differences. In terms of a building, temperature differences tend to occur in the up-down direction (vertical direction), so the ventilation section is formed along this flow, creating a smooth air flow and preventing high relative humidity conditions that would cause condensation. [Brief description of the drawings]

[0018] [Figure 1] 1 is a schematic cross-sectional view of a mounting structure for a vacuum insulation material according to the present invention. [Diagram 2] 2 is a schematic diagram of the vacuum insulation material as viewed from the mounting surface side. [Diagram 3] FIG. 2 is a schematic cross-sectional view of an exterior film. [Figure 4] 13 is a table showing the results of an investigation into the causal relationship between the height of an adhesive member and the occurrence of condensation. [Diagram 5] 11 is a table showing the results of an investigation into the causal relationship between the area of ​​an adhesive member relative to a mounting surface and the occurrence of condensation. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0019] The vacuum insulation material mounting structure 1 according to the present invention is a structure in which a vacuum insulation material 3 is mounted on an exterior wall 2 of a building. The exterior wall 2 of the building is the outer wall of a building, a detached house, etc. As is clear from FIG. 1, the vacuum insulation material 3 is formed of a core material 5 covered with an exterior film 4. The inside of the vacuum insulation material 3 is kept in a vacuum. The core material 5 is formed of inorganic fibers such as glass wool, a porous material, etc. The vacuum insulation material 3 is adhered and held to the exterior wall 2 of the building via an adhesive member 6. That is, the adhesive member 6 is interposed between the exterior wall 2 and the vacuum insulation material 3, and adheres the exterior wall 2 and the vacuum insulation material 3 to each other.

[0020] As is clear from Fig. 2, an adhesive member 6 is provided on the mounting surface side of the vacuum insulation material 3 to the exterior wall 2, and the remaining portion serves as a ventilation section 7. In other words, the ventilation section 7, together with the adhesive member 6, is provided between the exterior wall 2 and the vacuum insulation material 3. This ventilation section 7 serves as a space through which air can circulate.

[0021] As is clear from FIG. 3, the exterior film 4 has a multi-layer structure and includes at least a gas barrier layer 8. The gas barrier layer 8 is a resin layer containing a vinyl group other than polyvinyl alcohol, and is preferably an EVOH resin. Aluminum is vapor-deposited on the gas barrier layer 8 to form an aluminum vapor-deposited layer 8a. This provides gas barrier properties against oxygen and nitrogen due to the gas barrier layer 8, as well as gas barrier properties against water vapor due to the aluminum vapor-deposited layer 8a. An adhesive layer 9 is formed on the core material 5 side (inner side) of the exterior film 4, and a first protective layer 10 is formed on the side (outer side) that is attached to the outer wall 2. The adhesive layer 9 is made of, for example, a film of low-density polyethylene resin, high-density polyethylene resin, polypropylene resin, ethylene-propylene copolymer, or methylpentene polymer. The first protective layer 10 is made of, for example, a polyolefin (polyethylene, polypropylene, polyethylene terephthalate) film, a polystyrene film, an acrylonitrile-styrene copolymer, an acrylonitrile-butadiene-styrene film, a methacrylic film, a polycarbonate film, a polyvinyl alcohol film, an ethylene vinyl alcohol film, a nylon film, or a polyamide resin film. The gas barrier layer 8 is 10 μm to 20 μm thick, the aluminum vapor deposition layer 8a is 0.02 μm to 0.07 μm thick, the adhesive layer 9 is 25 μm to 60 μm thick, and the first protective layer 10 is 10 μm to 25 μm thick.

[0022] According to the mounting structure 1 for vacuum insulation material having such a configuration, a vent 7 is formed between the vacuum insulation material 3 and the exterior wall 2, and air flows through this vent, preventing condensation from occurring even when there is a sudden change in temperature. This prevents a high relative humidity state that would cause condensation, and prevents gas containing water vapor from penetrating the exterior film 4 of the vacuum insulation material 3 and affecting the core material 5. In particular, since the gas barrier property of the gas barrier layer 8 is weak in a high relative humidity environment, this mounting structure is suitable for the vacuum insulation material 3 that is intended to be covered with such an exterior film 4.

[0023] Condensation due to high relative humidity can occur due to air present in the adhesive member 6 when the adhesive member 6 is applied when the vacuum insulation material 3 is attached, or water vapor that passes through the exterior wall 2 and flows in. Even if such air or water vapor convection occurs, the present invention can effectively provide gas barrier properties using the exterior film 4. In particular, the aluminum vapor deposition layer 8a is intended to prevent the permeation of gases containing water vapor, but this alone cannot completely prevent the permeation of gases containing water vapor, so the formation of the ventilation section 7 by providing the adhesive member 6 is still important.

[0024] Here, as shown in FIG. 3, a second protective layer 11 made of PET may be further formed on the exterior film 4. This second protective layer 11 may be subjected to alumina deposition to form an alumina deposition layer 12. The thickness of the second protective layer 11 is 10 μm to 20 μm. The alumina deposition layer 12 has excellent performance in preventing the permeation of gases containing water vapor. By providing such a layer, the gas barrier property of gases containing water vapor can be further improved. However, since the alumina deposition layer 12 alone cannot sufficiently prevent the permeation of gases containing water vapor, it is essential to suppress a high relative humidity environment by the ventilation part 7. The alumina deposition layer 12, in combination with the ventilation part 7, contributes to further preventing the permeation of water vapor.

[0025] Moreover, the thickness of the adhesive member 6 is preferably 1 mm or more. This time, the thickness of the adhesive member 6 was changed to form a mounting structure for the vacuum insulation material, and the occurrence of condensation was verified. As shown in FIG. 4, when the thickness of the adhesive member 6 was 1 mm, a small amount of condensation occurred, and when it was 10 mm, no condensation occurred. On the other hand, when the thickness of the adhesive member 6 was set to 0 mm, condensation occurred. The verification of the occurrence of condensation was carried out in an environment in which the temperature was changed from 45° C. to 25° C. and the humidity was also changed from 90% to 95% over a period of 4 hours. Even with a thickness of 1 mm, a small amount of condensation occurred, but it was to a degree that could be tolerated for use. Therefore, it was found that if the thickness of the adhesive member 6 is set to 1 mm or more, the thickness (height) of the ventilation portion 7 is secured, so that an area for air flow can be secured, and a high relative humidity state in which condensation occurs can be prevented. It was found that the thicker the ventilation portion 7, the greater the effect of preventing condensation, but if it is 10 mm or more, the vacuum insulation material 3 is not affected by the occurrence of condensation.

[0026] In addition, it is preferable that the adhesive member 6 has an area covering 30% or less of the area of ​​the mounting surface of the vacuum insulation material 3 to the outer wall 2. In other words, in FIG. 2, the area of ​​the adhesive member 6 is 30% or less of the area of ​​the vacuum insulation material 3. This time, the area of ​​the adhesive member 6 was set to 10%, 30%, and 50%, and verification was performed. In this verification, the thickness of the adhesive member 6 was unified to 10 mm. The verification of the occurrence of condensation was performed in an environment in which the temperature was changed from 45°C to 25°C and the humidity was also changed from 90% to 95% over a period of 4 hours. As shown in FIG. 5, when the area of ​​the adhesive member 6 was set to 50%, the area of ​​the ventilation part 7 was relatively reduced, and a small amount of condensation occurred. On the other hand, no condensation occurred at 30% or 10%. Therefore, it was found that by forming the adhesive member 6 so that it occupies 30% or less of the area of ​​the mounting surface, the area of ​​the ventilation section 7 exceeds 70% of the area of ​​the mounting surface, thereby ensuring an area for better air flow and preventing high relative humidity conditions that would cause condensation.

[0027] From these results, it can be seen that if the thickness of the adhesive member 6 is set to 10 mm, the height of the ventilation section 7 can be secured and a certain degree of condensation prevention effect can be obtained, but in order to further increase this effect, it is important to consider the area ratio of the adhesive member 6 to the mounting surface. The thickness and area ratio of the adhesive member 6 work together to obtain the effect of preventing high relative humidity conditions that would cause further condensation.

[0028] Here, in the mounting structure of the vacuum insulation material according to the present invention, the adhesive member 6 is linear and formed in the vertical direction. That is, when the vacuum insulation material 3 is mounted on the exterior wall 2, the adhesive member 6 is in the form of a linear strip and arranged in the vertical direction. This is the arrangement as shown in FIG. 2. By forming the adhesive member 6 in a linear shape and in the vertical direction in this way, the ventilation section 7 is also formed in the vertical direction. Therefore, the air flow is also vertical. The air flow is generated by temperature differences. In terms of a building, temperature differences are likely to occur in the up-down direction (vertical direction), so the ventilation section 7 is formed along this flow, so a smooth air flow can be formed and a high relative humidity state that would cause condensation can be further suppressed.

[0029] As explained above, the present invention provides a mounting structure 1 for a vacuum insulation material by first depositing aluminum on EVOH to compensate for the vulnerability of the conventionally used EVOH to water vapor (high relative humidity environment) for the exterior film 4 covering the core material 5, and further enhancing the gas barrier properties with an alumina deposition layer 12. And when that alone is not enough, a ventilation section 7 is further provided under specified conditions to prevent the area where the vacuum insulation material is installed from becoming a high relative humidity environment, thereby suppressing the effects of gas flowing into the vacuum insulation material 3. [Explanation of symbols]

[0030] 1: mounting structure for vacuum insulation material, 2: exterior wall of building, 3: vacuum insulation material, 4: exterior film, 5: core material, 6: adhesive member, 7: ventilation section, 8: gas barrier layer, 8a: aluminum vapor deposition layer, 9: adhesive layer, 10: first protective layer, 11: second protective layer, 12: alumina vapor deposition layer

Claims

1. A vacuum insulation material, a gas barrier layer which is a resin layer containing a vinyl group other than polyvinyl alcohol; An exterior film including the gas barrier layer; A vacuum insulation material including a core material covered with the exterior film; An exterior wall of a building to which the vacuum insulation material is attached; and an adhesive member interposed between the outer wall and the vacuum insulation material to bond them together; A mounting structure for a vacuum insulation material, comprising: a vent portion arranged between the outer wall and the vacuum insulation material together with the adhesive member, through which air can flow.

2. 2. The vacuum insulation material mounting structure according to claim 1, wherein the exterior film includes an alumina vapor deposition layer made of a resin on which alumina has been vapor-deposited.

3. 2. The vacuum insulation material mounting structure according to claim 1, wherein the adhesive member is formed so as to cover an area of ​​30% or less of the area of ​​the mounting surface of the vacuum insulation material to the exterior wall.

4. 2. The vacuum insulation material mounting structure according to claim 1, wherein the adhesive member has a thickness of 1 mm or more.

5. 2. The vacuum insulation material mounting structure according to claim 1, wherein the adhesive member is linear and extends vertically.

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