WO2014021237A1

WO2014021237A1 - Heat-insulating plate

Info

Publication number: WO2014021237A1
Application number: PCT/JP2013/070403
Authority: WO
Inventors: 野口　修平; 彩乃野口; 直樹天野
Original assignee: 日本遮熱株式会社
Priority date: 2012-07-30
Filing date: 2013-07-23
Publication date: 2014-02-06
Also published as: PH12014502212B1; PH12014502212A1; JP5322070B1; JP2014043762A

Abstract

Provided is a heat-insulating plate capable of being used for newly constructed buildings and existing buildings and of being used as an inexpensive and highly energy-saving metal external wall material, metal roofing material, metal shutter material, etc. This heat-insulating plate is characterized in that a heat-insulating layer (2), which comprises a layer of a material that has a high reflectance with respect to radiant heat, is provided on either the front or the back surface of a base material (metal substrate (1)) without interposing an air layer and the surface on which said heat-insulating layer has been provided is used as the surface on the opposite side from the surface that is directly or indirectly irradiated by sunlight.

Description

Heat shield plate material

The present invention provides a heat shield plate material that can be used for a new building or an existing building and can be used as a metal outer wall material, a metal roof material, a metal shutter material, etc. that are inexpensive and highly energy-saving.

Most steel buildings, such as factories and warehouses, use metal roofing materials, metal outer wall materials, or metal plates such as metal shutters as a fire prevention measure. However, although a sheet for preventing condensation is applied to these metal plates, almost no heat insulating material is used.
For example, in steel buildings such as factories and warehouses, many facilities are installed inside, the floor area is very large, cranes etc. are installed on the ceiling, or to take measures against heat using convection heat, The roof height is also high. In addition, the wall area is designed to be much larger than that of a general office building, but it often opens and closes entrances and exits for products, and it is very expensive to install indoor air conditioning equipment. The current situation is that most warehouses and factories are not heat-insulated.
Also, many shutters used in stores and factories are wound around a winding drum and used. However, they have hardly been insulated until now.
Furthermore, in agricultural buildings such as poultry houses and cattle houses, slate roofs are mostly used in these agricultural buildings because metal roofs corrode in a short time due to alkaline substances generated from livestock manure. However, after the asbestos problem of slate roofing material was discovered, de-slate processing has progressed, and in newly constructed buildings, it is switching to metal folded plate roofing material. However, few materials can prevent corrosion of metal roofing materials from alkaline substances.

Therefore, there are the following problems.
First, in steel-frame buildings such as factories and warehouses, metal roofs such as folded plates are mostly used, and some of these metal roofs use thin sheets for preventing condensation, but they are mostly insulated. Moreover, the metal plate which is not provided with the heat insulating material is used also as an outer wall. For this reason, indoors are very hot in the summer, and cold in the winter.
In addition, if heat insulation work or heat insulation work is performed on the indoor side of these metal roofs and outer walls, the efficiency of air conditioning can be improved and the work environment can be greatly changed, but the construction cost is increased as described above. was there. In addition, many of the shutters installed on the wall are not heat-insulated, and this is a factor that reduces the thermal efficiency of the room. This is because the shutter is wound around a take-up drum as described above. For this reason, when a heat insulating material is attached to the shutter material, the take-up drum becomes too large, and there is a problem that it is practically difficult to use. Also, if the heat insulating material is made thin, not only the heat insulating effect is small, but even if it is attached, the shutter always moves, so there is a risk that it will easily peel off, and most shutters are not done at present .
In addition, as mentioned above, slate roofing materials were mostly used in agricultural buildings such as poultry houses and cowsheds in the past, but in recent years, metal folded-plate roofing materials have been used. There was a problem similar to the building.
In addition, in agricultural buildings such as poultry houses and cowsheds, there is a natural phenomenon called a black glove phenomenon as a cause of significant stress on weight gain of meat animals. This is a phenomenon that occurs when the temperature exceeds 25 ° C, and it is a problem that the productivity of chickens, pigs, cattle, etc. is greatly reduced. To prevent this phenomenon, the amount of radiant heat radiated from the roof and outer walls It is an important problem how to reduce the amount. However, in slate roofing materials, metal roofing materials, or exterior wall materials, most of them are materials that emit a lot of radiant heat, so not only the improvement in productivity is not very noticeable, but also the mortality rate is increasing year by year for chickens etc. .
Furthermore, in buildings, there is an environment where wind blows from outside, such as station buildings with no walls, roofs of distribution centers, and lower premises around buildings, and if strong winds such as typhoons blow into the room, Such a wind pressure is very large, and a lightweight heat insulating material or the like is drowned or blown by the wind pressure, so that it cannot be used at all.
SUMMARY OF THE INVENTION An object of the present invention is to propose a heat shield plate material that can be used for a new building or an existing building and can be used as an external wall material, roof material, shutter material, etc. that is inexpensive and has a high energy saving effect.

The present invention has been proposed in view of the above, and one surface of the front and back surfaces of a base material used as any one of an outer wall material, a roof material, and a shutter material of a building that is directly irradiated with sunlight. Without providing an air layer, a heat shield layer made of a material having a high reflectivity with respect to radiant heat is provided, and the surface provided with the heat shield layer is opposite to the surface directly irradiated with sunlight. The present invention relates to a heat shield plate characterized by being exposed to the indoor side.
“High reflectance” refers to a reflectance of about 80 to 90% or more. In addition, the “layer made of a material having a high reflectivity with respect to radiant heat” may be simply described as “a high reflectivity layer” in the following description.
The present invention also proposes a heat shield plate material characterized in that, in the heat shield plate material, the high reflectivity layer is an aluminum layer.
The “aluminum layer” may be a plate-like (film-like) aluminum foil (also referred to as an aluminum foil) having a thickness of 0.005 to 0.035 mm, or may be thinner. An aluminum vapor deposition layer may be sufficient.
Moreover, the present invention provides a chemical fiber sheet resin sheet, a resin film, a resin coating film between the metal substrate and the heat shield layer, which is a layer made of a material having a high reflectance with respect to the radiant heat, in the heat shield plate material. Also proposed is a heat shield plate material characterized by interposing an electrolytic corrosion prevention layer of any of the above.

The heat shield plate material of the present invention is provided with a heat shield layer, which is a layer made of a material having a high reflectivity with respect to radiant heat, that is, a low emissivity, on one surface (inner side surface) of the base material. In the warm season such as, the heat received from the outdoor side is hardly radiated to the indoor side, so that the indoor side can be kept cool. Further, for example, in a cold season such as winter season, the indoor heat can be reflected by reflecting the radiant heat from the indoor side toward the indoor side. Therefore, the indoor heating and cooling efficiency can be remarkably improved, and the indoor temperature environment can be suitably improved, so that freezing due to cold and heat stroke due to heat are not caused.
Moreover, since the heat shield plate material of the present invention has a high reflectance layer such as an aluminum layer on the surface on the indoor side, there is no problem even if strong wind such as typhoon blows in. Therefore, it can be used without any problem in buildings without walls such as station buildings and distribution centers. Also, field installation work can be performed in the same manner as conventional work, and no new equipment or tools are required. Therefore, the construction price can be kept low. Furthermore, since the thickness after molding is only about 0.1 to 0.2 mm thicker than a normal metal plate, the conveyance cost can be greatly reduced. And since the whole thickness is very thin, it is easy to bend with a tin roof molding machine or a folded plate molding machine, and a long product with a length of 50 to 100 m can be easily produced in a short time.
When the high reflectivity layer is an aluminum layer, the reflectivity is as high as 97 to 98% and the emissivity is as low as 3 to 2%. The effect regarding can be exhibited highly. Moreover, since highly reliable aluminum foil (aluminum foil) or aluminum vapor deposition is used as an industrial product, the bonding work with a metal substrate is easy, and the material cost can be suppressed.
In addition, between the metal substrate and the heat-shielding layer, which is a layer made of a material having high reflectivity with respect to the radiant heat, an electrolytic corrosion prevention layer made of any one of a chemical fiber sheet, a resin sheet, a resin film, and a resin coating film is provided. When intervening, even if the base material is a metal substrate and the high reflectivity layer is a metal material such as an aluminum layer, there is an electric potential that may occur when the metal material contacts the metal substrate. Eating can be prevented. In addition, the electric corrosion prevention layer made of chemical fiber sheets or resin coatings may be a thin layer of about 0.1 to 0.2 mm, so how to form this heat shield plate material such as roofing materials and shutter materials In this case, it can be performed freely without hindering the molding process. Moreover, since the thickness after molding is thin, it is lightweight and does not become bulky, so that management costs and transport costs can be significantly reduced. Moreover, this electrolytic corrosion prevention layer is also effective in acid resistance and alkali resistance.
Furthermore, when used as an outer wall material, roof material, or shutter material of a building, the heat shield plate material of this configuration is formed in the same manner as the outer wall material, roof material, and shutter material made of a conventional metal plate. The field installation work can also be performed just like the conventional work. Therefore, it is possible to reduce the construction cost at a lower cost than when performing heat insulation work or heat shield work separately.
In addition, the heat shield plate material of the present invention is not limited to a material that is molded as an outer wall material, a roof material, or a shutter material. For example, a known roof tile (such as a Japanese roof tile or a Western tile), a concrete block, a steel material, or the like. Can be used as a base material, and the heat shield layer of the present invention can be obtained by adding the heat shield layer on the inside thereof, and the above-mentioned heat shield effect can be easily imparted to roof tiles, concrete blocks, steel materials, etc. can do.

FIG. 1 is a cross-sectional view schematically showing one embodiment (a total three-layer embodiment) of the heat shield plate material of the present invention.
FIG. 2 is a cross-sectional view schematically showing another embodiment of the heat shield plate material of the present invention (an embodiment having a total two-layer structure).
FIG. 3 is a cross-sectional view schematically showing another embodiment of the heat shield plate material of the present invention (an embodiment having a total two-layer structure).

Hereinafter, the best mode for carrying out the present invention will be described.
According to reports from many US agencies, an average of 75% of the heat moving through buildings is radiant heat. Moreover, 70 to 93% of the heat entering and leaving the roof is radiant heat, and the amount of radiant heat in the wall direction is 65 to 80% of the entire wall. Therefore, it can be said that cutting such radiant heat is the most efficient energy saving method.
As a method of cutting this radiant heat, it is known that it is effective to install heat insulation work and heat shield work on the indoor side of the roof and outer wall as described above, but it also costs construction costs and is thick. By stretching the heat insulating material, management costs and transport costs are also required, and a configuration for preventing the heat insulating material from scattering in the room is also required. As an example, for example, there is a method of winding a wool-like heat insulating material around a pillar or the like and further winding an aluminum foil around the outer surface thereof.
The present invention is not intended to insulate the heat transfer from the outermost base material with a heat insulating material or the like, but to suppress an increase in indoor temperature by using a low radioactive material as a heat shielding layer. The invention was invented by paying attention to the fact that a heat shielding layer including a layer made of a material having a high reflectance with respect to radiant heat has low radiation.
The sum of the reflectance and emissivity of the metal is 壱 (1). That is, it can be said that a material with high reflectivity has low emissivity, and a material with high reflectivity is a material with low emissivity (= a material with high heat reflectivity is a material with low heat emissivity). For example, an aluminum layer such as an aluminum foil (aluminum foil) or aluminum vapor deposition has a reflectivity of 97 to 98% with respect to radiant heat, so the emissivity is only 2 to 3%. Further, the material having a high reflectivity with respect to the radiant heat is not limited to aluminum, and a noble metal such as gold or silver may be used.
Moreover, the higher the reflectance with respect to radiant heat, the more effective, and at least 95% or more is desirable.
Radiant heat is the most important factor that raises the temperature of a substance, so that if the room has a low radiation environment, it is possible to live in the room without being affected by the outside temperature, for example, in extremely cold winters or extremely hot summers. Changes in the environmental temperature of humans or animals such as chickens and cows, and changes in the temperature of various substances stored indoors can be reduced.
In other words, the heat flow that moves through the buildings is reversed in the warm season such as summer and the cold season such as winter, so that the low radiation performance can be effectively used in the warm season and highly reflective to radiant heat in the cold season. Performance can be used effectively.
The base material used as the base of the heat shield plate material of the present invention is mainly a metal substrate, but may be a ceramic plate material, a concrete plate material, or a plastic substrate. In particular, the function (characteristics) according to the purpose is most important for the metal substrate, and sufficient rigidity is required. As this metal substrate, steel plates such as various decorative steel plates and alloy plates can be used, and required strength characteristics and the like differ depending on the application (purpose) in which the heat shield plate material is used. For example, in a mode in which this heat shield plate material is directly formed and used, in the case of a roof material, a thickness of about 0.5 to 1.2 mm is used, and in the case of an outer wall material, it is the same as a general roof material In addition, a thickness of about 0.25 to 0.8 mm is used, and in the case of a shutter material, a thickness of about 0.5 mm is used. On the other hand, the thickness of the base material is not so important because the plastic substrate is used by being attached inside the other outer wall material.
As the plastic substrate, various hard resin plates can be used.
In addition, the ceramic plate material is a roof tile, the concrete plate material is a concrete block, and these building materials used on a daily basis can be used as a base material in the present invention. Therefore, the thickness is not so important even in the case of these ceramic plates and concrete plates.
In the heat shield plate material of the present invention, a heat shield layer having a high reflectivity and a low emissivity with respect to the radiant heat having the above-described configuration is provided on at least one surface (interior surface) of the base material having the above-described configuration without interposing an air layer. If an air layer exists between the base material and the heat shield layer, radiation heat is radiated from the back surface of the base material to the air layer, and the air layer itself absorbs the heat. It is transmitted to the layer. Thus, the heat shield plate material of the present invention is obtained by directly attaching a high reflectivity layer (heat shield layer) such as an aluminum layer to the indoor side of the base material. By attaching the high reflectivity layer (heat shield layer) directly to the base material in this way, the low reflectivity of the high reflectivity layer (heat shield layer) is used as described above. For example, in the warm season such as summer, Since the heat received from the outdoor side is hardly radiated to the indoor side, the indoor side can be kept cool.
Specifically, for example, in a warm season such as summer, conduction heat, convection heat, or radiant heat from the outside moves toward the room and is absorbed by the base material located on the outermost surface side. This heat is transferred to the high-reflectance layer (heat shield layer) on the back side as conduction heat, and a large amount of heat is transferred to the indoor air in the form of conduction heat or convection heat. Of course, at this time, radiant heat is also radiated, but since a high reflectivity layer (heat shield layer) such as an aluminum layer is a low emissivity layer, the amount of heat radiated into the room is very small.
Conversely, in cold seasons such as winter, indoor heat tends to move towards the outdoors. However, the high reflectivity layer (heat shield layer) such as an aluminum layer is a material having a high reflectivity with respect to radiant heat, so that the radiant heat is returned to the room, and the heat retention effect is maintained to maintain the heating effect continuously. Can do.
The heat shield plate material of the present invention has a structure in which a heat shield layer composed of a high reflectivity layer is provided on at least one surface of a base material as described above. It may be formed on both sides of the material. Thus, as a mode of providing a heat-shielding layer composed of a high reflectivity layer on both surfaces of a base material (particularly a metal substrate), for example, a specification suitable for applications such as a shutter material for a partition in a building such as a factory or a warehouse It is.
However, since the heat shield layer is composed of only a high reflectivity layer such as an aluminum layer, there is a possibility that electric corrosion may occur due to contact with the metal substrate (foreign metal) on the surface. Therefore, between a metal substrate and a high reflectance layer such as an aluminum layer, a non-woven fabric such as PE (polyethylene), PP (polypropylene), PET (polyethylene terephthalate, polyester), a chemical fiber sheet such as a glass cloth, or a resin sheet It is preferable to provide a galvanic corrosion prevention layer made of either a resin film or a resin film. This electrolytic corrosion prevention layer is also effective in acid resistance and alkali resistance.
The electric corrosion prevention layer is preferably about 0.1 to 0.2 mm regardless of its use (roof material, outer wall material, shutter material, etc.), and therefore the thickness of the high reflectivity layer such as an aluminum layer is 7 to 35 μm. Even in this case, the total heat shielding layer can be about 0.1 to 0.25 mm.
Therefore, the thickness of the heat shield plate material of the present invention is such that the thickness of the heat shield layer is about 0.1 to 0.25 mm as described above, and the thickness of the (metal) substrate is about 0.5 to 1.2 mm. Therefore, the total thickness of the heat shield plate material is about 0.7 to 1.8 mm and can be rolled or bent.
Furthermore, the electrolytic corrosion prevention layer prevents contact between a metal (metal substrate) as a base material and a metal (such as an aluminum layer) as a high reflectivity layer. An electrolytic corrosion prevention layer may be provided for the purpose of preventing contact between the reflectance layer and an external metal.
The electrolytic corrosion prevention layer used here may be exactly the same as described above, but it is preferable to adhere a highly permeable resin such as a polymer poly film in consideration of corrosion caused by alkaline substances generated from livestock manure.
As described above, the heat shield plate material of the present invention has a total two-layer structure in which a heat shield layer composed of a high reflectivity layer such as an aluminum layer is formed on the back surface side (indoor side) of the base material, and prevents electrolytic corrosion. There are cases in which a total of three layers is formed in which two layers of a layer and a high reflectance layer (heat shielding layer) are formed. Applications of the former configuration include ceramic tiles, walls, floors, FRP shutters, etc., mainly used for wooden buildings, and applications of the latter configuration include colonials, metal tiles, ceramic siding, etc. Used for wooden buildings. In addition, in consideration of corrosion caused by alkaline substances generated from livestock manure, the outer wall of the barn is provided with a corrosion prevention layer on the inner surface side of a high reflectivity layer (heat shield layer) such as an aluminum layer, for a total of four layers. It is preferable to use a heat shield plate material. The corrosion prevention layer is not particularly limited as long as it has acid resistance and alkali resistance, and may be a layer common to the electrolytic corrosion prevention layer. Applications of this configuration include metal roofs, outer walls, shutters, doors, ALC roofs, walls, RC roofs, walls (outer wall tiles, artificial marble), etc. for steel buildings, agriculture, high-rise building PC construction methods, general buildings Used.
In the case of the total two-layer structure, the metal substrate and the heat shield layer may be joined without interposing an air layer. In the case of the total three-layer structure, after the electrolytic corrosion preventing layer and the heat shielding layer are welded or bonded, the welded or welded sheet is bonded again so that the electrolytic corrosion preventing layer is in direct contact with the metal substrate. Or what is necessary is just to weld.
The heat shield plate material having a total of two to four layers according to the present invention integrated in this manner has an extremely small overall thickness, and can be processed in any way by various molding machines.

Examples of the present invention will be described below, but the present invention is not limited to these examples, and may be configured in any manner without departing from the scope of the claims.
Example 1 of the heat shield plate material shown in FIG. 1 has a total three-layer structure in which an electrolytic corrosion prevention layer 3 and a high reflectance layer (heat shield layer) 2 are formed on the back side of a base material (metal substrate) 1. It is a configuration.
Example 2 of the heat shield plate material shown in FIG. 2 has a total two-layer structure in which a high reflectivity layer (heat shield layer) 2 is formed on the back side of a base material (metal substrate) 1.
In Example 3 of the heat shielding plate material shown in FIG. 3, an electrolytic corrosion prevention layer 3, a high reflectance layer (thermal insulation layer) 2, and an electrolytic corrosion prevention layer 3 are formed on the back side of the base material (metal substrate) 1. It is the structure of the total 4 layer structure.
Each of FIGS. 1 to 3 is schematically shown to show a cross-sectional configuration, and is not realistic about thickness and the like.
As the base material (metal substrate) 1 in Examples 1 to 3, a decorative steel plate having a thickness of 0.5 mm is used, and as the high reflectivity layer 2, an aluminum layer (aluminum foil) having a thickness of 15 μm is used. As the prevention layer 3, a chemical fiber sheet (PE non-woven fabric) having a thickness of 0.3 mm was used.
Further, when the heat shield plate material of FIG. 2 is produced, the electrolytic corrosion prevention layer 3 and the high reflectance layer 2 are welded and joined (specifically, an aluminum foil is thermally welded to the nonwoven fabric via PE). After the heat shield sheet was prepared, the heat shield sheet was bonded (or welded) and integrated so that the electrolytic corrosion prevention layer 3 was in direct contact with the metal substrate 1. Further, when the heat shield plate material of FIG. 3 is produced, the electrolytic corrosion prevention layer 3, the high reflectivity layer 2, and the electrolytic corrosion prevention layer 3 are welded and joined in substantially the same manner, and then the joined sheet is attached to the metal substrate 1. It was bonded (bonded) to and integrated.
<Thermal insulation test 1>
Using the heat shield plate material of Example 2, molding processing was performed as a roof material and an outer wall material, respectively. In addition, as a comparative example, the same metal plate as that of the metal substrate 1 was used, and the molding process was similarly performed as a roofing material and an outer wall material.
In addition, the shaping | molding process as a roofing material was made into the shape of the folded-plate roof in which a mountain part and a trough part continue alternately. In addition, the processing as the outer wall material has a shape in which the left and right sides of the substantially flat central portion are raised in an inclined manner.
〔experimental method〕
Using the heat shield plate material of Example 2 as described above, the roof material and the outer wall material were molded as described above as an example, and using the same metal plate as that of the metal substrate 1, it was molded as described above. The roof material and the outer wall material are used as comparative examples. These are arranged under the same conditions and left outdoors, and the temperature on the indoor side (the surface opposite to the surface irradiated with sunlight) is measured. Compared.
[Result 1]
When the outside air temperature is 32 ° C., the indoor side temperature of the roof material of Example 2 is 42.2 ° C., whereas the indoor side temperature of the roof material of the comparative example (only the metal substrate 1) is 46.degree. 2 ° C., and the difference was 4 ° C.
When the outside air temperature is 32 ° C., the temperature on the indoor side of the outer wall material of Example 2 is 37.2 ° C., whereas the temperature on the indoor side of the outer wall material of the comparative example (only the metal substrate 1) is 46.degree. 4 ° C., and the difference was 9.2 ° C.
[Discussion]
Since the overall thickness of the heat shield plate material of Example 2 of the present invention is very thin, any process (rolling process, bending process, etc.) for forming an uneven shape on the surface can be easily performed. Therefore, similarly to the comparative example configured by only the metal substrate 1, a long object can be easily manufactured in a short time.
In addition, since the heat shielding plate materials of Examples 1 to 3 are all highly reflective layers such as an aluminum layer on the back side, the inner surface side is a highly reflective layer such as an aluminum layer even when strong wind such as typhoon blows in. No problem occurred.
<Thermal insulation test 2>
In the concrete block, the heat shielding plate material having a structure in which the heat shielding layer is added only from the high reflectivity layer 2 is used as an example, and the distance from the heat source (800 W heater) is changed from 100 mm to 500 mm to change the temperature inside the heat shielding plate material. Measured and compared.
[Result 2]

[Discussion]
As is clear from Table 1, when the distance from the heat source is 100 to 300 mm, the heat shield plate material of the present invention has a clear heat shield effect compared to the comparative example in which no heat shield layer is present. On the other hand, when the distance from the heat source is 400 to 500 mm, it is considered that the influence of wind or the like is reflected in the data.

1 Base material (metal substrate)
2 Electric corrosion prevention layer 3 Aluminum layer (high reflectivity layer)
4 Outer wall material made of steel

Claims

With respect to radiant heat without interposing an air layer on one side of the front and back of the base material used as any one of the outer wall material, roofing material, and shutter material of the building directly irradiated with sunlight A heat shield layer, which is a layer made of a material having a high reflectance, is provided, and the surface on which the heat shield layer is provided is exposed to the indoor side opposite to the surface directly irradiated with sunlight. Board material.
The heat-shielding plate material according to claim 1, wherein the heat-shielding layer, which is a layer made of a material having a high reflectance with respect to radiant heat, is an aluminum layer.
Between the metal substrate and the heat shield layer, which is a layer made of a material having a high reflectivity with respect to the radiant heat, an electrolytic corrosion prevention layer made of any one of a chemical fiber sheet, a resin sheet, a resin film, and a resin coating film is interposed The heat-insulating plate material according to claim 1 or 2, wherein