JP4938579B2 - Composite heat insulating material and external heat insulating structure using the same - Google Patents

Description

  The present invention belongs to the technical field of a composite heat insulating material and an external heat insulating structure using the composite heat insulating material, and more particularly relates to a composite heat insulating material having excellent heat insulating properties and moisture permeability and an external heat insulating structure using the same.

  As the heat insulating material, a plate-shaped heat insulating material made of polyurethane foam, polystyrene foam, phenol foam or the like is used. Recently, in order to improve heat insulation, a composite heat insulating material is disclosed in which a sheet-like material made of aluminum foil or an aluminum vapor-deposited plastic film is bonded to at least one surface of the heat insulating material as a heat ray reflective layer (Patent Document 1). See).

  However, in a configuration in which a sheet material made of aluminum foil or aluminum vapor-deposited plastic film is simply bonded to the heat insulating material, the moisture permeability decreases, for example, a composite heat insulating material in which the sheet material is bonded to the outdoor surface of the heat insulating material. When an external heat insulating structure is configured using the above, there is a problem that internal condensation occurs inside the heat insulating material and the heat insulating property of the heat insulating material itself is lowered.

  Therefore, a composite heat insulating material using an aluminum vapor-deposited film in which a large number of air holes are formed as a heat ray reflective layer is disclosed (see Patent Document 2).

Japanese Patent Laid-Open No. 11-71835 JP-A-10-317528

  The composite heat insulating material of Patent Document 2 has a configuration excellent in heat insulation and moisture permeability, but the process for forming a large number of air holes in the aluminum vapor deposition film is complicated, and additional equipment is required. Therefore, there is a problem that costs increase.

  An object of the present invention is to provide a composite heat insulating material excellent in heat insulating property and moisture permeability that can be manufactured at low cost without using separate equipment, and an external heat insulating structure using the same.

As means for solving the above problems, the composite heat insulating material according to the invention described in claim 1 is:
A composite heat insulating material used for a heat insulating structure of a structure,
An aluminum foil produced by rolling is bonded to at least one surface of the heat insulating material, and the aluminum foil has a thickness of 5 μm or more and 20 μm or less, and a number of pinholes are formed by the rolling. It is characterized by.

The invention according to claim 2 is the composite heat insulating material according to claim 1,
A film having a moisture permeability equal to or lower than that of the aluminum foil is bonded to the other surface of the heat insulating material.

According to a third aspect of the invention, the composite insulating material according to claim 1 or claim 2,
The moisture permeability of the aluminum foil is greater than 0 g / 24 h · m ² and 20 g / 24 h · m ² or less.

The invention according to claim 4 is the composite heat insulating material according to any one of claims 1 to 3 ,
The infrared emissivity of the aluminum foil is 0.2 or less.

The invention according to claim 5 is the composite heat insulating material according to any one of claims 1 to 4 ,
The heat insulating material is characterized by comprising a synthetic resin foam plate.

The invention according to claim 6 is the composite heat insulating material according to any one of claims 1 to 5 ,
The synthetic resin foam board is composed of an extruded polystyrene foam heat insulating board.

The outer heat insulating structure according to the invention described in claim 7 is:
A thermal insulation structure having a structure in which a composite heat insulating material is provided on the outdoor side of the shaft portion of the structure, and an exterior material is further provided on the outdoor side via a ventilation trunk edge,
The composite heat insulating plate according to any one of claims 1 to 6, wherein the composite heat insulating material is provided with an aluminum foil on the outdoor side .

  Since the composite heat insulating material according to the present invention uses a pinhole generated during the rolling process of the aluminum foil as a ventilation hole, an aluminum foil having a ventilation hole can be produced easily and inexpensively without using separate equipment. By using an aluminum foil, a composite heat insulating material excellent in heat insulating properties and moisture permeability can be manufactured at low cost.

  In addition, since a thin aluminum foil is used, it can be manufactured at a lower cost.

  Since the outer heat insulating structure according to the present invention uses the composite heat insulating material having excellent heat insulating properties and moisture permeability as described above, the wall body can be maintained soundly while improving the heat insulating properties.

  DESCRIPTION OF EMBODIMENTS Embodiments of a composite heat insulating material and an outer heat insulating structure using the same according to the present invention will be described with reference to the drawings.

  In this composite heat insulating material 1, an aluminum foil 3 is joined to substantially the entire region of at least one surface of the heat insulating material 2 (see FIG. 1). In addition, when using the said composite heat insulating material 1 for an exterior heat insulating structure etc. so that it may mention later, the aluminum foil 3 is joined to the substantially whole area of the surface arrange | positioned on the outdoor side of the heat insulating material 2, and it arrange | positions indoors. A film having a moisture permeability equal to or lower than that of the aluminum foil 3 (for example, an aluminum foil having a thickness of 20 μm or more, an iron foil, or a polyethylene sheet having a thickness of 200 μm or more) is preferably bonded to substantially the entire surface of the surface (illustrated). Is omitted, and the invention according to claim 2). By bonding a film having a moisture permeability equal to or lower than the moisture permeability of the aluminum foil 3 to the indoor side, internal dew condensation that occurs inside the heat insulating material can be reduced.

  The heat insulating material 2 is preferably lightweight and excellent in water resistance, heat insulating property and pressure resistance, and a synthetic resin foam having closed cells is preferred (the invention according to claim 6). Specifically, for example, a synthetic resin foam having closed cells such as a polystyrene foam, a polyethylene foam, a polypropylene foam, a polyurethane foam, and a phenol foam is preferable. In particular, an extruded polystyrene foam heat insulating plate (trade name “Styloace” manufactured by Dow Chemical Co., Ltd.) is most preferable because of its high heat insulation and low water absorption (the invention according to claim 7). As the thickness of the heat insulating material 2, a thickness of about 5 mm to 100 mm can be used.

  The aluminum foil 3 has a thickness of 5 μm or more and 20 μm or less. The aluminum foil 3 is manufactured by rolling, and a large number of pinholes (vent holes 4) are formed by the rolling (refer to FIG. 2, invention according to claim 3).

Generally available aluminum foil has a thickness of 5 μm to 200 μm. Among them, the present inventor paid attention to the fact that a large number of pinholes are formed when a thin aluminum foil is manufactured by rolling. An aluminum foil having a thickness of more than 20 μm hardly generates pinholes during the rolling process, and an aluminum foil having a thickness of less than 5 μm is a custom-made product, which is costly and very difficult to roll. The aluminum foil 3 of the present invention has a thickness of 5 μm or more and 20 μm or less. At this time, when the aluminum foil 3 is manufactured by a general rolling process such that the thickness of the aluminum foil 3 is 5 μm or more and 20 μm or less, the moisture permeability of the aluminum foil 3 is caused by internal condensation occurring inside the heat insulating material 2. of a level that does not affect the durability and thermal conductivity, greater than 0g / 24h · m ^2, it is possible to 20g / 24h · m ² or less (a fourth aspect of the present invention).

  Incidentally, the infrared emissivity of the aluminum foil 3 is preferably 0.2 or less (the invention according to claim 5). This is because when the infrared reflectance of the aluminum foil 3 is 0.2 or less, the heat shielding property is remarkable, and when the aluminum foil 3 is joined to the heat insulating material 2, the heat shielding property is improved.

  The aluminum foil 3 is made of, for example, a film 5 made of polystyrene that is backed by dry lamination on at least one surface of the aluminum foil 3 to form an aluminum foil with film, and the aluminum foil with film is bonded to the heat insulating material 2 by thermal lamination. ing. Since the film 5 made of polystyrene is thin (about 20 μm) and has high moisture permeability, the moisture permeability of the heat insulating material 2 is not hindered.

  Note that an adhesive 6 such as an epoxy adhesive, a urethane adhesive, or a synthetic rubber hot melt adhesive may be applied to the heat insulating material 2 and the aluminum foil 3 may be joined. At this time, partial bonding (spotting or linear) by the adhesive 6 may be used (see FIGS. 3 and 4). Since the adhesive 6 is not applied to the entire surface of the heat insulating material 2, the moisture permeability of the heat insulating material 2 is not hindered.

  Moreover, the groove | channel 7 may be formed in the surface by the side of joining the aluminum foil 3 of the heat insulating material 2, and the adhesive agent 6 may be apply | coated to the convex part between the said grooves 7 and 7, and it may mutually join ( (See FIG. 5). Water vapor or the like that has passed through the heat insulating material 2 from the groove 7 can be diffused, and a composite heat insulating material having excellent moisture permeability can be configured.

  Since the composite heat insulating material 1 having the above-described configuration uses a pinhole generated during rolling of the aluminum foil 3 as a vent hole, the aluminum foil 3 having the vent hole can be manufactured easily and inexpensively without using any separate equipment. By using the aluminum foil 3, a composite heat insulating material having excellent heat insulation and moisture permeability can be manufactured at low cost.

  Further, since the thin aluminum foil 3 is used, it can be manufactured at a lower cost.

  The composite heat insulating material 1 of the said structure is used for an outer-layer heat insulation structure as follows.

  This outer heat insulating structure 8 is substantially the same as the conventional outer heat insulating structure, such as a shaft portion 9 of a structure (for example, a column / intermediate column in the conventional shaft assembling method, a vertical frame material in the frame wall method, etc.) The composite heat insulating material 1 in which the aluminum foil 3 is bonded to the outdoor side surface of the heat insulating material 2 is provided on the outdoor side of the structural frame material such as C-shaped steel in FIG. It is the structure which provided the exterior | packing material 11 (refer FIG. 6).

  Specifically, when viewed from the indoor side, the structural plywood 12, the composite heat insulating material 1, the ventilation trunk edge 10, and the exterior material 11 are arranged in this order, and the ventilation layer 13 is interposed between the composite heat insulation material 1 and the exterior material 11. Is formed. This air-permeable layer 13 is used to remove internal dew condensation or high-humidity air formed in the interior of the composite heat insulating material 1, the joint between the composite heat insulating materials 1 and 1, and the gap between the composite heat insulating material 1 and the pillar / inter-column. 13 is provided to dissipate to the outside through 13 to keep the wall dry and prevent corrosion of trees. As described above, since the composite heat insulating material 1 is excellent in heat insulating properties and moisture permeability, the outer heat insulating structure 8 using the composite heat insulating material 1 can maintain the wall body soundly while improving the heat insulating properties. .

  Incidentally, as the ventilator edge 10, in addition to the conventionally used wood, a synthetic resin having a corrosion resistance (including a low foamed product having a foaming ratio of about 1 to 3 times) or a metal is used. it can. For the purpose of forming the ventilation layer 13 of the wall body, the ventilating edge 10 is usually a vertically long member having a thickness of about 10 mm to 30 mm and a width of about 20 mm to 70 mm. It is then fastened to the pillars / intermediate pillars with fasteners such as nails or screws.

  Even if the exterior material 11 is dry construction using exterior materials such as a hollow cement system, a lightweight concrete system, a ceramic system, and a ceramic system, for example, an angle lath or the like for a ventilation method is attached to the ventilation trunk edge 10, It may be wet construction such as mortar coating.

<Example 1>
The emissivity was measured with respect to the aluminum foil or the polyester (thickness 12 μm) aluminum vapor deposition film shown in Table 1 using “JIS A 1423 Infrared Radiation Thermometer Simple Measuring Method of Emissivity”. In addition, it is excellent in heat-shielding property, so that the value of emissivity is low.

  The emissivity measurement results are shown in Table 1 below.

  From this measurement result, it can be seen that the aluminum foil exhibits a substantially constant and very low emissivity regardless of its thickness. In addition, as a comparison, the emissivity of an aluminum vapor deposition film made of a polyester film (thickness 12 μm) base material already used as a heat ray reflective layer was also measured, but the aluminum vapor deposition film has a high emissivity and poor heat shielding properties. It can be inferred that it is a material.

<Example 2>
A 20 μm thick OPS film is lined with dry lamination using urethane adhesive on one side of an aluminum foil of each thickness (4 μm to 25 μm) to produce a film for thermal lamination, and then heated using a hot roll. By fusing, the moisture permeability of the composite heat insulating material joined to the surface of a 50 mm thick extruded polystyrene foam heat insulating plate (trade name “Styloace” manufactured by Dow Chemical Co., Ltd.) was simulated.

  Specifically, it calculated from the moisture permeability of the extrusion method polystyrene foam heat retention board measured according to JISK7225, and the moisture permeability of the film measured according to JISZ0208.

  Hereafter, the simulation result of the water vapor transmission rate of each composite heat insulating material is shown in FIG.

  From this measurement result, it can be inferred that when the aluminum foil is thicker than 20 μm, the moisture permeability is almost zero and the moisture permeability is inferior. On the other hand, it can be inferred that the thinner the thickness, the greater the moisture permeability and the better the moisture permeability.

  From the above, considering that the aluminum foil that is generally available has a thickness of 5 μm to 200 μm, it can be seen that the thickness of the aluminum foil constituting the composite heat insulating material is preferably 5 μm or more and 20 μm or less.

It is the schematic perspective view which showed the composite heat insulating material which concerns on this invention. It is a schematic enlarged view of the A part of FIG. It is the schematic perspective view which showed the different composite heat insulating material which concerns on this invention. It is the schematic perspective view which showed the different composite heat insulating material which concerns on this invention. It is the schematic perspective view which showed the different composite heat insulating material which concerns on this invention. It is the horizontal sectional view which showed the outer-layer heat insulation structure which concerns on this invention. It is a figure which shows the simulation result of the water vapor transmission rate of each composite heat insulating material of Example 2.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Composite heat insulating material 2 Heat insulating material 3 Aluminum foil 4 Vent hole 5 Polystyrene film 6 Adhesive 7 Groove 8 Outer heat insulating structure 9 Structure shaft part 10 Venting trunk edge 11 Exterior material 12 Structural plywood 13 Ventilation layer

Claims (7)

A composite heat insulating material used for a heat insulating structure of a structure,
An aluminum foil produced by rolling is bonded to at least one surface of the heat insulating material, and the aluminum foil has a thickness of 5 μm or more and 20 μm or less, and a number of pinholes are formed by the rolling. A composite heat insulating material. The composite heat insulating material according to claim 1 , wherein a film having a water vapor transmission rate equal to or lower than a water vapor transmission rate of the aluminum foil is bonded to the other surface of the heat insulating material. Moisture permeability of the aluminum foil is greater than 0 g / 24h · m ^2, and characterized in that 20 g / 24h · m ² or less, the composite thermal insulator according to claim 1 or 2. The composite heat insulating material according to any one of claims 1 to 3 , wherein the aluminum foil has an infrared emissivity of 0.2 or less. The composite heat insulating material according to any one of claims 1 to 4 , wherein the heat insulating material is made of a synthetic resin foam board. The composite heat insulating material according to any one of claims 1 to 5 , wherein the synthetic resin foam plate comprises an extruded polystyrene foam heat insulating plate. A thermal insulation structure having a structure in which a composite heat insulating material is provided on the outdoor side of the shaft portion of the structure, and an exterior material is further provided on the outdoor side via a ventilation trunk edge,
An outer heat insulating structure in which the composite heat insulating plate according to any one of claims 1 to 6 is provided with an aluminum foil as an outdoor side as the composite heat insulating material.

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