JP2001107480A - Heat shield sheet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heat shield sheet being proper for use as a heat-insulating material for a building, a structure or the like and having heat shield and thermal insulation properties and flexibility. SOLUTION: One surface or both surfaces of a flexible sheet member 3 such as a urethane foam, foamed styrene or the like having closed air holes 3a as voids forming a radiant space are coated with thermal reflection type paint layers 5a, 5b, in which ceramics or an inorganic compound having a thermal reflection function such as titanium oxide, alumina, silicon oxide or the like is mixed into acrylic or epoxy resin paints, and the paint layers 5a, 5b are formed on one surface or both surfaces. It is desirable that metallic foil 9a, 9b such as aluminum foil are interposed among the sheet member 3 and the thermal reflection paint layers 5a, 5b.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat shield sheet having heat insulation, heat retention and flexibility, which is suitable for use as a heat insulating material for buildings and buildings.

[0002]

2. Description of the Related Art Conventionally, a function of absorbing electromagnetic waves such as sunlight and converting it into heat and emitting infrared rays (hereinafter referred to as heat reflection).
Heat-reflective paints having a heat-reflection coating are known, and are applied directly to buildings, warehouse roofs, fuel tanks, pipings of various plants, air-conditioning ducts, and the like, and have a large heat shielding and heat retaining effect.

[0003]

However, since the base of the heat-reflective coating is made of a resin such as acryl, the heat conductivity is large, so that the heat on the application object side is thermally conducted to the coating resin layer. It is unavoidable that the surface temperature of the coating material changes as a result to the same temperature as that of the object to be applied. Therefore, even if the heat reflection type paint is applied to the piping or the air conditioning duct of the plant through which the low-temperature fluid flows, it is impossible to prevent the dew condensation on the surface. On the other hand, pipes and ducts through which high-temperature fluid flows increase in temperature, so the amount of radiation as infrared rays increases,
As a result, the amount of radiation to the outside increases, and the heat reflectivity decreases. Further, when a fluid having a considerably high temperature flows, the coating film of the heat reflection type paint cannot function as a protective layer, and therefore, it is difficult to employ the coating from the viewpoint of safety such as burns.

[0004] When a heat-reflective paint is applied to the roof of a building, particularly to the outdoor surface of the roof, the atmosphere functions as a space in which heat transfer is performed exclusively by radiation (hereinafter referred to as a radiation space). Because it reflects the sunlight and heat, it can very effectively exhibit the heat shielding effect and provide external heat insulation.However, in order to use it for internal heat insulation in order to enhance indoor heat retention, the following issues must be considered in terms of construction, etc. there were. In other words, when this heat-reflective paint is applied to the outdoor surface of the roof for external heat insulation, it can be easily applied by spraying or roller coating, but the heat can be applied to the back surface of building materials such as flooring, ceiling materials and wall materials. In order to apply reflective paint for internal insulation, the attic and under floor are narrow spaces,
Not only is the workability of the painter unable to secure a work space, the workability is extremely poor, but also a curing operation is required, which increases the construction cost. In addition, when directly applied to the back surface of building materials such as floor materials, ceiling materials, and wall materials, heat conduction from these building materials to the heat-reflective paint also raises the temperature. Since the amount of radiation to the outside as infrared rays increases, the heat reflectivity decreases as a result.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to provide a flexible material which is rich in heat insulation and heat reflection, has a high heat retaining performance, and is excellent in workability even in a narrow place. To provide a heat shield sheet having

[0006]

Means for Solving the Problems In order to achieve the above object, the invention of a heat shielding sheet according to claim 1 is provided on one or both sides of a flexible sheet member having a void forming a radiation space. It is characterized in that a heat reflection type paint layer is formed by mixing a ceramic or inorganic compound having a heat reflection function such as titanium oxide, alumina or silicon oxide into a resin paint such as acrylic or epoxy.

In order to efficiently reflect heat by the heat-reflective paint layer, a radiation space (where heat transfer is performed exclusively by radiation) is provided between the heat-reflective paint layer and the heat-shielding object such as a pipe. Space). Therefore, according to the above configuration, since the heat-reflective paint layer is formed on one or both surfaces of the sheet member having the void as the radiation space, the radiation space can be reliably secured adjacent to the heat-reflective paint layer, The heat of the heat shield target is suppressed from being transmitted by heat conduction, so that it is exclusively transmitted by radiation, and this radiant energy is converted into infrared rays by the heat reflection type paint layer, and as much as possible in the incident direction. Radiation can enhance heat reflection.

For example, when the heat shield sheet is used on the outer periphery of a pipe through which a high-temperature fluid or a low-temperature fluid flows, the heat shielding sheet is interposed between the pipe and the heat-reflective paint layer so that the radiation space intervenes. Wind the heat sheet and fix it. In this case, the gap of the heat shield sheet acts as a radiation space, suppresses heat conduction from the pipe to the heat reflection type paint layer, and functions as a space exclusively transmitting radiant energy from the pipe. For this reason, the heat reflection type paint layer does not become high or low temperature due to heat conduction, but exclusively absorbs the radiant energy, converts it into heat, converts it into far infrared rays, and radiates it in the incident direction. That is, heat can be reflected. As a result, the temperature change on the outer surface of the heat shield sheet, which is the heat reflection type paint layer, is suppressed, and the temperature can be made equal to the ambient atmosphere temperature. Therefore, even if the pipe through which a considerable amount of high temperature fluid flows is touched, there is no burn. Further, even when a low-temperature fluid such as a refrigerant flows, no dew condensation phenomenon occurs on the surface.

In addition, the heat shielding sheet can use a flexible sheet member such as urethane foam or styrene foam as a base material, and the base material of the flexible sheet member is made of ceramic. Even in a configuration in which a heat-reflective coating layer is formed by applying a mixed resin coating, sufficient flexibility can be maintained. Accordingly, even in a narrow space such as an attic, under the floor, in a wall, or the like, the heat shield sheet can be easily installed if there is a gap equal to or greater than the thickness of the heat shield sheet. And the above-mentioned heat shielding effect can be obtained only by installing.

[0010] In addition, during transportation and storage, it is easy to handle because it can be wound into a roll and made compact.

According to a second aspect of the present invention, in the first aspect of the present invention, a metal foil such as an aluminum foil is interposed between the sheet member and the heat reflection type paint layer. .

According to the above construction, the metal foil having a high reflectance can reflect the radiant energy in the incident direction with high efficiency, and the heat shielding effect can be improved as compared with the first aspect.

Further, since the metal foil has a low bending rigidity, the same flexibility as in the first aspect can be maintained.

[0014]

Preferred embodiments of the present invention will be described below in detail with reference to the accompanying drawings. FIG. 1 is a cross-sectional view showing a first embodiment of the heat shield sheet according to the present invention.

The heat shield sheet 1a of the first embodiment is an acrylic resin paint in which ceramic is mixed on one side of a sheet member 3 of urethane foam which has a closed air hole 3a to form a fixed air layer. Is formed by applying a heat reflection type paint layer 5 made of In FIG. 1, the sheet member 3 is disposed such that the exposed surface side of the sheet member 3 and the outer peripheral surface of the pipe 17 as a heat source are in contact with each other. That is, the closed air holes 3a of the urethane foam function as voids forming radiation spaces.

As the sheet member 3 forming the fixed air layer, foamed styrene or, for example, an air cap manufactured by Ube Industries, Ltd. can be employed in addition to the urethane foam, and the thickness thereof is determined in consideration of the heat insulating property and flexibility of the material. Is set. In the present embodiment, foamed urethane is used and 10
mm thickness.

The heat-reflective paint layer 5a provided on one side is formed to a thickness of 100 μm on one side by spraying a heat-reflective paint having a heat reflecting function. This heat-reflective paint has an average particle diameter of 150 to 350 as a ceramic having the heat-reflective function in an aqueous acrylic resin as a vehicle.
2 μm closed silicon oxide hollow ceramic filler
It is blended at a weight ratio of 0 to 40%.

As the ceramic / inorganic compound having a heat reflecting function, other than the above, titanium oxide, alumina and the like can be adopted.

In addition to the above, acrylic vehicles, epoxy resins or Lux systems, aqueous alkyds, melamine, urea phenol resin systems, vinyl chloride systems, etc. can be used as the vehicle.

The compounding ratio of the ceramic having the heat reflection function and the thickness of the heat reflection type paint layer are set in consideration of the required heat shielding properties and flexibility.

Next, the operation of the heat shield sheet 1a will be described with reference to FIG. The heat shield sheet 1a is wound around and fixed to the outer periphery of the pipe 17 for keeping the temperature of the pipe 17 through which the high-temperature fluid flows inside and preventing burns. Then, at this time, the air fixing layer in the heat shield sheet 1a acts as the radiation space described above, that is, suppresses heat conduction from the pipe 17 to the heat reflection type paint layer 5a.
Acts exclusively as a space for transmitting radiant energy from Therefore, the heat-reflective coating layer 5a absorbs the radiant energy exclusively, converts it to heat, and emits far-infrared rays without being heated to a high temperature by heat conduction. Most of the far-infrared rays are radiated toward the radiation space, that is, in the incident direction, so that the radiant energy from the pipe 17 is thermally reflected as much as possible to keep the temperature. In addition, since the temperature rise on the outer surface of the heat-shielding sheet 1a, which is the heat-reflective coating layer 5a, is suppressed, no burns occur even when touched, that is, burns can be prevented.

As described above, since the temperature change on the outer surface of the heat shield sheet 1a, which is the heat reflection type paint layer 5a, can be suppressed to be equal to the ambient atmosphere temperature, the pipe through which the low temperature fluid such as the refrigerant flows. In the case of using No. 17, no dew condensation phenomenon occurs on the surface.

FIG. 2 is a sectional view showing a heat shield sheet 1b of the second embodiment. Here, the overall schematic configuration of the second embodiment is substantially the same as the configuration of FIG. 1 shown in the above-described first embodiment. Only the points will be described.

As shown in FIG. 2, basically, in the second embodiment, the heat reflection type paint layers 5a, 5a
This is different from the first embodiment in that b is formed.

That is, the heat-shielding sheet 1b is a heat-reflective paint layer 5a, 5b made of an acrylic resin paint in which ceramic having a heat-reflecting function is mixed on both sides of a sheet member 3 of urethane foam, which is a fixed air layer. Is formed by coating. As shown in FIG. 3, the heat shield sheet 1 b is laid on the upper surface of the ceiling plate 27 of the building 21, and is used for heat insulation of the living room 22 located below the ceiling plate 27.

In summer, radiant energy from the roof 23 due to sunlight is thermally reflected by a heat-reflective paint layer (hereinafter, referred to as an upper heat-reflective paint layer 5a) on the upper part of the heat shield sheet 1b, and is reflected below. The temperature rise of the living room 22 can be prevented as much as possible, and in winter, the radiant energy from the living room 22 can be transferred to the heat-reflective paint layer (hereinafter, the lower heat-reflective paint layer) below the heat shielding sheet 1b. The heat is reflected by the paint layer 5b) to prevent the temperature in the living room 22 from dropping. However,
In the winter, when heat is conducted from the ceiling plate 27 to the heat shield sheet 1b by contact between the lower portion of the heat shield sheet 1b and the upper surface of the ceiling plate 27, the temperature of the lower heat reflection type paint layer 5b increases due to heat conduction. . However, in this case, the air fixing layer functions as a radiation space, so that heat conduction from the lower heat reflection type paint layer 5b to the upper heat reflection type paint layer 5a is suppressed, and the upper heat reflection type paint layer 5a As a result, the temperature of the living room 22 can be prevented from lowering as much as possible.

The heat shielding sheet 1b has a thickness of about 10 mm.
It is thick and has good flexibility, it is easy to handle, and a sufficient heat shielding effect can be obtained by simply laying it on the upper surface of the ceiling plate 27. Even if there is, it can be easily heat shielded. Furthermore, the thickness of the heat insulating material which has been conventionally used is 1
Since it is extremely thin as compared with glass wool having a thickness of 00 to 200 mm, it is not necessary to secure a large heat insulating material installation space as in the related art, and the ceiling can be raised to make the living space large.

FIG. 4 shows a heat shield sheet 1c according to a third embodiment. Here, the overall schematic configuration of this embodiment is almost the same as the configuration of FIG. 2 shown in the second embodiment. Therefore, the same members are denoted by the same reference numerals, and only the differences will be described.

As shown in FIG. 4, basically, the present embodiment is different from the second embodiment in that a reflection film is formed by interposing an aluminum foil between the sheet member and the heat reflection type paint layer. It is different from the form. That is, the heat-shielding sheet 1c has an upper reflective film 9a and a lower reflective film 9b formed by bonding aluminum foil to both surfaces of a sheet member 3 of urethane foam as a fixed air layer. Heat-reflective paint layer 5 made of acrylic resin paint mixed with ceramic
a and 5b are formed by coating. Since this aluminum foil film has a high reflectance of radiant energy, it can reflect radiant energy efficiently, and the heat shielding performance is remarkably improved. In addition, since it is made of aluminum foil, its bending rigidity is small, it is possible to maintain almost the same flexibility as in the second embodiment, and it is easy to handle.

FIG. 5 shows an example in which the third embodiment is applied to floor heating. FIG. 5 (a) shows the existing floor heating device 31a,
It is sectional drawing which shows the example which applied 3rd Embodiment in order to raise the heating effect.

As shown in FIG.
a is a flooring floor material 33 which is a floor;
A plate-like cushion material 35 laid in contact with the lower surface of the cushion material to absorb vibration of
The hot water supply device 37 is provided in contact with the lower surface of the hot water supply 5 and heats the floor material 33 with hot water, and a heat insulating material 39 made of glass wool is provided to surround the lower surface of the hot water supply device.

The hot water supply device 37 includes a hot water supply pipe 37c which is a cylindrical pipe through which hot water flows, an upper metal plate 37a and a lower metal plate 37b which cover the hot water supply pipe 37c vertically, and heats and supplies water in the hot water supply pipe. And a hot water supply device (not shown). The upper metal plate 37a is a flat plate abutting on the cushion material 35 on the entire upper surface thereof, and the lower metal plate 37b is a substantially flat plate member having a recess formed so as to fit the hot water supply pipe 37c. is there. Then, the upper metal plate 37a and the lower metal plate 37b are overlapped in a state where the hot water supply pipe 37c is fitted into the concave portion, so that the two metal plates 37a and 37b are overlapped.
The hot water supply pipe 37c is sandwiched and fixed between a and 37b to form a hot water supply device 37.

The heat shield sheet 1c of the third embodiment is laid on the lower surface of the heat insulating material 39 of the existing floor heating device 31a. In this case, since there is a radiation space by the heat insulating material 39, the radiant energy transmitted from the hot water supply pipe 37c via the lower metal plate 37b is thermally reflected by the upper heat reflection type paint layer 5a, and the lower heat reflection type paint layer 5a further reflects the radiant energy. The light can be reflected by the upper reflective film 9a. Accordingly, the heating efficiency can be significantly improved.

FIG. 5B shows an example in which the third embodiment is applied as a part of a newly installed floor heating device 31b. FIG.
The new floor heating device 31b shown in (b) is a heat shielding sheet 1 instead of the heat insulating material 39 of the above-mentioned existing floor heating device 31a.
c. In this case, the upper heat reflection type paint layer 5a and the upper reflection film 9a rise in temperature due to heat conduction, but there is a fixed air layer therebelow, so the lower reflection film 9b and the lower heat reflection type paint layer 5b allows radiant energy to be reflected and thermally reflected. If a fixed air layer such as an air cap is provided between the heat shield sheet 1c and the metal plate 37b, the heating effect is further improved.

While the first to third embodiments have been described above, FIG. 6A is a cross-sectional view of another assumed embodiment.
To (b). However, the configuration is almost the same as that of the above-described first to third embodiments. Therefore, the same members are denoted by the same reference numerals, and detailed description thereof will be omitted.

Although various embodiments of the present invention have been described above, the present invention is not limited to these embodiments, and various modifications can be made without departing from the gist of the present invention.

For example, in each of the above embodiments, a member having an air hole 3a in the interior such as urethane foam is used as the sheet member 3 having a fixed air layer. The material is not limited to this as long as it functions as a radiation space that exclusively transmits radiant energy by suppressing heat conduction to the paint layers 5a and 5b. As the sheet material 3, thin plates are attached to both end surfaces of a honeycomb structure. It is also possible to use a sheet member consisting of When the heat source is at a high temperature, heat-resistant fibers or the like can be used.

[0038]

As described above, according to the heat shield sheet of the first aspect of the present invention, a heat reflection type paint layer is formed on one or both sides of a sheet member having a gap as a radiation space. A radiation space can be reliably secured adjacent to the heat reflection type paint layer, and the heat of the heat shielding target is suppressed from being transmitted by heat conduction, so that the radiation is transmitted exclusively by radiation. It is converted into infrared rays by the mold paint layer and emitted in the direction of incidence as much as possible, so that the heat reflectivity can be enhanced. As a result, the temperature change on the outer surface of the heat shielding sheet, which is the heat reflection type paint layer, is suppressed, and the temperature can be made equal to the ambient atmosphere temperature. Therefore, even if the pipe through which a considerable amount of high temperature fluid flows is touched, there is no burn. Further, even when a low-temperature fluid such as a refrigerant flows, no dew condensation phenomenon occurs on the surface.

The heat shielding sheet may be made of a flexible sheet member such as urethane foam or styrene foam as a base material, and the base material of the flexible sheet member may be made of ceramic. Even in a configuration in which a heat-reflective coating layer is formed by applying a mixed resin coating, sufficient flexibility can be maintained. Therefore, even in a narrow space such as an attic, under the floor, inside a wall, etc., if there is a gap equal to or greater than the thickness of the heat shield sheet, the heat shield sheet can be easily installed, and moreover, only the installation is required. The above-mentioned heat shielding effect can be obtained. Accordingly, even if a building to be subjected to thermal insulation construction is already installed, construction can be performed relatively easily, and the construction cost can be kept low.

In addition, when transporting and storing, it is easy to handle because it can be compacted by winding it into a roll.
Distribution costs such as storage can be reduced.

Further, the heat shield sheet can be significantly thinner than conventional heat insulating materials. For this reason, the installation space for insulation materials occupying the attic and side walls can be significantly reduced, and the living space volume should be as large as possible, such as by increasing the ceiling and increasing the ratio of the living area to the building area. Can be.

According to a second aspect of the invention, there is provided the heat shield sheet according to the first aspect, wherein a metal foil such as an aluminum foil is interposed between the sheet member and the heat reflection type paint layer. Therefore, the radiant energy can be reflected with high efficiency in the incident direction by the metal foil having a large reflectance, and the heat shielding effect can be improved as compared with the first aspect.

Further, since the metal foil has a small bending stiffness, the same flexibility as in the first aspect can be maintained.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a heat shield sheet according to a first embodiment of the present invention.

FIG. 2 is a sectional view showing a heat shield sheet according to a second embodiment of the present invention.

FIG. 3 is a cross-sectional view of an upper part of a building showing an example in which the second embodiment according to the present invention is applied as a heat insulating member for a ceiling of the building.

FIG. 4 is a sectional view showing a heat shield sheet according to a third embodiment of the present invention.

FIG. 5 is a cross-sectional view showing an example in which the third embodiment according to the present invention is applied to a floor heating device. FIG. 5 (a) shows a case in which this embodiment is added to an existing floor heating device. (B) is a figure which shows the example which used this embodiment for some newly installed floor heating apparatuses.

FIG. 6 is a sectional view showing another embodiment of the heat shield sheet according to the present invention.

[Explanation of symbols]

1a, 1b, 1c, 1d, 1e Heat shield sheet 3 Sheet member 5a, 5b Heat reflective paint layer 9a, 9b Reflective film (metal foil) 17 Piping 21 Building 22 Living room 23 Roof 24 Attic 25 Window 27 Ceiling plate 29 Fishing rod 31a Existing floor heating device 33 Flooring material 35 Cushion material 37 Hot water supply device 37a Upper metal plate 37b Lower metal plate 37c Hot water pipe 39 Insulation material 31b New floor heating device

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) E04B 1/74 E04B 1/74 H (72) Inventor Toru Watanabe 1-14-1-15 Ebisu Minami, Shibuya-ku, Tokyo F-term (reference) in Japan Environmental Research Laboratories Co., Ltd. AB10C AB33C AD00B AD00H AK01A AK12 AK25B AK51 AK53B BA02 BA03 BA05 BA06 BA07 BA10A BA10B BA13 CA30B CC00B DD22 DJ00A DJ01 GB07 JD10 JJ03 JJ10B JJ10H JK17A JL01 JL07

Claims (2)

[Claims] 1. One or both sides of a flexible sheet member having a void forming a radiation space, has a heat reflection function of titanium oxide, alumina, silicon oxide and the like in a resin paint such as acrylic or epoxy. A heat shield sheet characterized in that a heat reflection type paint layer mixed with a ceramic or an inorganic compound is applied and formed. 2. The heat shield sheet according to claim 2, wherein a metal foil such as an aluminum foil is interposed between the sheet member and the heat reflection type paint layer.