JP2022031785A - Building panel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a flat building panel having a temperature control function and a high incombustibility even when a latent heat storage member is provided between a metal skin and a core material.

SOLUTION: In a building panel, a core material is filled between two metal skins, and a latent heat storage member is provided between the metal skin and the core material. The latent heat storage member includes an inorganic heat storage material generating a solid-solid phase transition. The latent heat storage member is bonded to both of an inner surface of the metal skin and a surface in contact with the core material. The core material has adiabaticity.

SELECTED DRAWING: Figure 1

COPYRIGHT: (C)2022,JPO&INPIT

Description

The present invention relates to a building panel, for example, a building panel that can be used as a building material such as a wall material or a floor material.

Conventionally, as a building panel, a building panel in which paraffin is incorporated as a heat storage material in a sandwich panel in which a core material having a heat insulating property is filled between two metal outer skins has been proposed (see, for example, Patent Document 1).

Paraffin has a latent heat effect when the solid-liquid phase change occurs between the solidified state and the melted state, so that it can provide a temperature control function. There is a problem that the stress damages the metal outer skin and deteriorates the appearance of the building panel.

Therefore, in Patent Document 1, by securing a space corresponding to the volume change accompanying the solid-liquid phase change of paraffin, the stress generated by the volume change is suppressed from damaging the metal outer skin.

However, in order to form a building panel in consideration of the volume of the latent heat storage member, the temperature above the melting point at which the heat storage material changes its state from solid to liquid, that is, the volume of the latent heat storage member in the liquid state becomes the maximum. There was a limitation on the processing temperature, such as having to process according to the temperature.

Further, it is necessary to perform uneven processing on the metal outer skin according to the volume of the latent heat storage member, and in addition to the increase in manufacturing cost due to the increase in manufacturing man-hours, there is also a problem that the appearance is spoiled by providing unevenness on the metal outer skin. rice field.

Further, since paraffin is easily burned, it is required for a building panel to have higher heat resistance such as nonflammability.

Japanese Unexamined Patent Publication No. 2015-158085

An object of the present invention is to provide a flat building panel having a temperature control function and high nonflammability.

The building panel according to one aspect of the present invention is a building panel in which a core material is filled between two metal outer skins and a latent heat storage member is provided between the metal outer skin and the core material.
The latent heat storage member contains an inorganic heat storage material that causes a solid-solid phase transition.
The latent heat storage member is adhered to both the inner surface of the metal outer skin and the surface in contact with the core material.
The core material has heat insulating properties.
It is characterized by that.

According to one aspect of the present invention, a flat building panel having a temperature control function and high nonflammability can be obtained.

1A is a perspective view showing an example of a building panel according to an embodiment of the present invention, and FIG. 1B is a cross-sectional view showing a part thereof. A measurement system used for measuring the temperature control function of a building panel according to an embodiment of the present invention is shown, FIG. 2A is a schematic cross-sectional view thereof, and FIG. 2B is a side view seen from the X-ray direction. Is. It is sectional drawing which shows an example of the building panel which built in the conventional latent heat storage material. It is a graph which shows the measurement result of a temperature control function.

Hereinafter, an embodiment of the present invention will be described.

As shown in FIG. 1A, the building panel 1 of the present embodiment is formed as a sandwich panel in which a core material 4 is filled between two metal outer skins 2 and 3, and is further formed by incorporating a latent heat storage member 5. To.

The metal outer skins 2 and 3 are formed into a predetermined shape by subjecting, for example, a flat metal plate to a process such as roll molding. The metal outer skins 2 and 3 may have, for example, a flat shape or a shape having a plurality of uneven ribs. In particular, the metal outer skins 2 and 3 preferably have a flat shape. In this case, the shape of the surface of the building board 1 can be made particularly flat and flat. Therefore, even when a plurality of building boards 1 are installed, it is possible to obtain a uniform appearance with high design. The metal outer skins 2 and 3 can be formed of a metal plate conventionally used for forming a building material, for example, a steel plate, a galvanized steel plate, a galvalume steel plate (registered trademark), an SGL (registered trademark) steel plate, and a vinyl chloride steel plate. , Paint plating can be mentioned. The plate thickness of the metal outer skins 2 and 3 is not particularly limited, and may be, for example, 0.3 to 2.0 mm.

The core material 4 may be any as long as it has heat insulating properties, and more preferably one having fire resistance or fire resistance. Specifically, a foam can be used as the core material 4. The core material 4 has a thickness of 20 to 150 mm, 30 to 200 kg / It is preferable to set it to m ³ , but it is not limited to this.

The core material 4 may be a single piece over the entire metal sandwich panel 1, or may be formed by arranging a plurality of block-shaped objects side by side. When a resin foam is used for the core material 4, a liquid resin material (urethane, phenol, etc.) can be foamed on the surface of the metal outer skin 2 or 3 to form the core material 4.

Further, a refractory core material formed of the above-mentioned inorganic fiber material or a material having higher fire resistance than the resin foaming material can be used for the peripheral end portion of the building panel 1. As the refractory core material, a material made of an inorganic material such as gypsum or calcium silicate can be used.

The metal outer skins 2 and 3 and the core material 4 can be adhered and integrated by using an adhesive. Further, when the core material 4 is formed by foaming a liquid resin material on the surface of the metal outer skin 2 or 3, the metal outer skins 2 and 3 and the core material 4 are integrated by self-adhesion of the liquid resin material. be able to.

The building panel 1 may have a fitting convex portion 6 formed at one end (for example, the upper end) thereof and a fitting concave portion 7 formed at the other end (for example, the lower end). In this case, the building panels 1 and 1 arranged adjacent to each other can be connected by fitting the fitting convex portion 6 and the fitting concave portion 7, and the connection strength can be increased.

The latent heat storage member 5 stores heat by utilizing latent heat. The latent heat storage member 5 is composed of a bag body 8 and a heat storage material 9. The bag body 8 is formed of a metal foil having good thermal conductivity, such as aluminum foil. The latent heat storage member 5 preferably includes, for example, a bag body 8 formed by sealing the heat storage material 9 of a powder sample with aluminum foil. In this case, the building board 1 can secure excellent heat storage performance. The bag body 8 may have a flexible shape, or may have a substantially rectangular sheet shape or a plate shape, as will be described later.

The heat storage material 9 contains an inorganic heat storage material 9a that causes a solid-solid phase transition.

Here, the solid-liquid phase transition is a change in the phase state of a substance at a specific temperature (sometimes referred to as a phase transition temperature), for example, just as a solid substance changes from a solid state to a liquid state at a melting point. A substance that causes a change in volume. On the other hand, the solid-solid phase transition means that a substance in a solid state does not change its phase state to a liquid state and undergoes a phase transition while maintaining the solid state.

Since the inorganic heat storage material 9a causes a solid-solid phase transition at the phase transition temperature peculiar to the heat storage material, that is, the phase transition in the solid phase state, the state change of the substance (for example, the phase state change from solid to liquid) ) Is unlikely to occur, and volume changes due to state changes hardly occur.

Therefore, the building panel 1 containing the inorganic heat storage material 9a that causes the solid-solid phase transition can suppress the stress generated by the volume change from damaging the metal outer skin 2. This makes it possible to obtain a flat building panel without spoiling the appearance of the building panel.

Further, since the inorganic heat storage material 9a has almost no volume change and almost no stress is generated, it can be arranged on the surface of the building panel 1 without providing unevenness for releasing the stress. As a result, a manufacturing process such as processing for forming unevenness becomes unnecessary, and the manufacturing cost can be suppressed.

Since the inorganic heat storage material 9a has excellent heat resistance, a high melting point, and a solid-phase-solid-phase phase transition using an electronic phase transition is possible, the building panel 1 can have high nonflammability. .. Further, in forming the building panel 1, processing at a high temperature is possible, and since it is not necessary to adjust the processing temperature according to the phase transition temperature, the temperature at the time of formation is not restricted. Therefore, the convenience in manufacturing can be improved.

The inorganic heat storage material 9a may be any component that causes a solid-solid phase transition, but more preferably contains a transition metal compound. In this case, since the transition metal compound is particularly excellent in nonflammability, even if the inorganic heat storage material 9a is used for temperature control, particularly high nonflammability can be imparted to the building panel 1. Therefore, for example, it can be suitably used as an indoor / outdoor wall material, a roof material, and a floor material of a building that requires high fire resistance and fire protection.

Transition metal oxides include, for example, vanadium (V), tungsten (W), tarium (Ta), niobium (Nb), ruthenium (Ru), molybdenum (Mo), rhenium (Re), cobalt (Co), chromium (Cr). ) Can contain an oxide containing at least one transition metal selected from the group.

In this case, since the inorganic heat storage material 9a has a high thermal conductivity, it is possible to suppress the occurrence of a temperature difference between the surface and the inside of the latent heat storage member 5 and uniformly transfer energy. Therefore, the effect of keeping the temperature inside the building constant can be enhanced.

The inorganic heat storage material 9a preferably contains at least one of a transition metal oxide and a composite oxide of the transition metal oxide. That is, it is preferable that the latent heat storage member 5 contains at least one of a transition metal oxide and a composite oxide of the transition metal oxide. In this case, the inorganic heat storage material 9a has a higher thermal conductivity and can enhance the effect of keeping the temperature constant. As a result, the building panel 1 containing the inorganic heat storage material 9a can suppress changes in the indoor temperature and keep the temperature constant for a long period of time. For example, indoors such as a plant factory where strict temperature control is required. It can be suitably used as a wall material. Further, since the heat storage effect can be obtained by either hot or cold heat, by using it as a wall material of a building, it is possible to reduce other equipment for temperature adjustment and to achieve an energy saving effect.

The transition metal oxide and the composite oxide of the transition metal oxide are, for example, V _(1-X) W _X O ₂ (0 <X ≦ 0.065), V _(1-X) Ta _X O ₂ (0 < X ≤ 0.117), V _(1-X) Nb _x O ₂ (0 <X ≤ 0.115), V _(1-X) Ru _X O ₂ (0 <X ≤ 0.150), V ₍₁ ) _-X) Mo _X O ₂ (0 <X ≦ 0.161), V _(1-X) Re _X O ₂ (0 <X ≦ 0.0964), LiMn ₂ O ₄ , LiVS ₂ , LiVO ₂ , LiRh ₂ O ₄ , V ₂ O ₃ , V ₄ O ₇ , V ₆ O ₁₁ , Ti ₄ O ₇ , SmBaFe ₂ O ₅ , EuBaFe ₂ O ₅ , GdBaFe ₂ O ₅ , TbBaFe ₂ O ₅ , DyBaFe ₂ O ₅ , HoBaFe ₂ Group consisting of O ₅ , YBaFe ₂ O ₅ , PrBaCo ₂ O _5.5 , DyBaCo ₂ O _5.54 , HoBaCo ₂ O _5.48 , YBaCo ₂ O _5.49 , V _(1-X) Cr _X O ₂ (0 <X ≦ 0.23) It can contain at least one oxide selected from.

Specifically, for example, "Smartec HS10", "Smartec HS70", and "Smartec HS120" of High Purity Chemical Laboratory Co., Ltd. can be used. As the properties of the inorganic heat storage material 9a, for example, powder, granule, or paste can be used.

Further, the heat storage material 9 may be formed of one kind of inorganic heat storage material or may be formed of a plurality of inorganic heat storage materials. For example, it contains at least two of the oxides selected from the group consisting of transition metal oxides only, transition metal oxide composite oxides only, or transition metal oxides, and transition metal oxide composite oxides. It can be formed from a mixture.

Examples of the mixture composed of the transition metal oxide and the composite oxide of the transition metal oxide include V _0.977 W _0.023 O ₂ .

Further, this inorganic heat storage material 9a has a large transition energy, and is 5% or more of the transition enthalpy in the solid-liquid phase transition of water _H2O (the transition enthalpy at the time of melting ice is about 306 J / cc). It can contain substances of composition. In this case, since latent heat can be generated at the transition temperature, the temperature can be kept constant in the vicinity of the transition temperature. Then, various holding temperatures can be selected for the transition energy and the transition temperature by controlling the composition of the substance.

Therefore, the holding temperature of the building panel containing the inorganic heat storage material 9a can be selected according to the composition of the substance. The range of the holding temperature is not limited, but for example, it is possible to construct a suitable environment for controlling the temperature in the room, and the composition of the substance whose holding temperature is in the range of -10 ° C to 70 ° C. can do. That is, a heat storage material 9a having a composition having a phase transition temperature of −10 ° C. to 70 ° C. can be used. The phase transition temperature is more preferably in the range of 0 ° C to 40 ° C, and particularly preferably in the range of 4 ° C to 25 ° C, which is a low temperature in a building or a vegetable cutting site suitable for a living environment. It can be used as a wall material for factories. In this case, since the room temperature can be maintained at an appropriate temperature, the cost of the air conditioning equipment can be reduced.

The thermal conductivity of the inorganic heat storage material 9a according to the present embodiment is preferably, but is not limited to, 5 W / mK or more. The melting point of the inorganic heat storage material is preferably 2000 ° C. or higher, but when forming the building panel 1, the composition and mixture of the inorganic heat storage material 9a are appropriately selected according to the target usage environment. Therefore, it is not limited to this.

The latent heat storage member 5 preferably has at least one shape selected from a substantially rectangular sheet shape and a plate shape. In this case, the building board 1 can be easily arranged between the metal outer skins 2 and 3 regardless of whether the metal outer skins 2 and 3 have a flat shape or a shape having uneven ribs. .. Further, particularly when the metal outer skins 2 and 3 have a flat shape, a more flat appearance can be obtained, and a building board 1 having a better design can be obtained.

The size of the latent heat storage member 5 is not particularly limited, but for ease of handling, for example, it can be a rectangular shape having a side of 50 to 500 mm and a thickness of 5 to 30 mm. One building panel 1 is formed by having one or a plurality of latent heat storage members 5. It is preferable that the latent heat storage members 5 are arranged so that the heat storage materials 9 are located in substantially equal amounts on the surface of the building panel 1. Further, it is preferable that the building panel 1 holds the heat storage material 9 of 0.3 to 3.0 kg / m ² with respect to one building panel 1 in order to fully exert the temperature control function. , The holding amount is not limited to this.

The latent heat storage member 5 is provided between the metal outer skin 2 and the core material 4. Here, one of the metal outer skins 2 is the metal outer skin 2 facing the indoor side when the building panel 1 is constructed. When the building panel 1 is constructed, even if the latent heat storage member 5 is provided between the metal outer skin 3 facing the outdoor side and the core material 4, the action of heat absorption and exhaust heat of the latent heat storage member 5 is difficult to be transmitted to the indoor side. Therefore, the temperature control function of the building panel 1 for indoors may not be fully exerted.

The latent heat storage member 5 may be adhered to both sides of the metal outer skin 2 and the surface in contact with the core material 4, or may be adhered to either one of the metal outer skin 2 and the surface in contact with the core material 4. , Or the surface in contact with the metal outer skin 2 and the core material 4 may not be adhered.

Since the latent heat storage member 5 has almost no volume change even if a phase transition occurs at the phase change temperature in a state where both sides of the surface in contact with the metal outer skin 2 and the core material 4 are adhered to the latent heat storage member 5, the latent heat storage member 5 is used. , Almost no expansion or contraction occurs, and damage to the metal outer skin 2 and the core material 4 can be suppressed.

Further, even if neither of the surfaces of the metal outer skin 2 and the core material 4 is adhered to each other, the metal outer skin 2 and the core material 4 can be brought into contact with each other during molding of the building panel 1, so that they are supported by them and latent heat storage. The member 5 is fixed.

When fixing the latent heat storage member 5, it can be adhered using an adhesive or the like. As the adhesive between the metal outer skin 2 and the latent heat storage member 5, and the adhesive between the core material 4 and the latent heat storage member 5, the same adhesive as the adhesive for adhering the metal outer skins 2, 3 and the core material 4 is used. For example, a urethane adhesive is used. Further, when the liquid resin material is foamed to form the core material 4, the core material 4 and the latent heat storage member 5 are adhered by self-adhesion of the liquid resin material.

When the metal outer skin 2 or the core material 4 and the latent heat storage member 5 are not adhered to each other, the surface of the latent heat storage member 5 is arranged so as to be in contact with the surface of the metal outer skin 2 or the core material 4 without using an adhesive. Will be done.

Further, in the case of forming the core material 4 by foaming a liquid resin material, in order to prevent the core material 4 and the latent heat storage member 5 from adhering to each other, the side where the latent heat storage member 5 comes into contact with the core material 4 A release agent can be provided on the surface of the. As the release agent, when the core material 4 is formed of a resin foam such as urethane, isocyanurate foam or phenol, a material containing petroleum naphtha or the like is used. The release agent is provided on the surface of the latent heat storage member 5 by a method such as coating.

The building panel 1 is preferably nonflammable. In this case, it is possible to easily form an outer wall or the like having high fire resistance.

In this way, since the latent heat storage member 5 is arranged in advance between the metal outer skin 2 and the core material 4, the building panel 1 saves the trouble of arranging the heat storage member later as in the conventional building panel. be able to. Therefore, the nonflammable building panel can be smoothly constructed.

Further, the building panel 1 as described above can be used when forming a roof base, a wall, a floor, or the like of a building. In this case, a plurality of building panels 1 are installed side by side, but the adjacent building panels 1 are connected by fitting the fitting convex portion 6 and the fitting concave portion 7, or are connected by abutting the end faces. To. Further, the metal outer skin 2 with which the latent heat storage member 5 is in contact is constructed so as to face the indoor side.

The building panel 1 according to the present embodiment can be applied to a normal house or factory, but can be particularly applied to a building that requires temperature control. For example, the building panel 1 can be suitably used as a wall material of a closed seedling production system unit used in a plant factory or the like. Further, the building panel 1 can be suitably used when forming a building of a cold insulation facility such as a warehouse. Furthermore, it can be applied as an inner wall material in spaces such as offices and stores where energy saving is required.

Hereinafter, the present invention will be specifically described with reference to Examples.

(Example 1)
A building panel having a thickness of 35 mm, a width of 910 mm, and a length of 2700 mm is formed. In this building panel, two metal outer skins are each made of a galvanized steel plate having a thickness of 0.5 mm. The core material is formed of polyisocyanurate foam (2 types) having a thickness of 34 mm. Each metal outer skin and core material are bonded by the self-adhesive force of the resin material forming the urethane foam. A plurality of latent heat storage members are built in the building panel.

The latent heat storage member was formed by enclosing a powder heat storage material in a bag body. The bag body is made of aluminum foil having a thickness of 0.01 mm. The heat storage material (Product No. Smartec HS10 manufactured by High Purity Chemical Laboratory Co., Ltd.) is mainly composed of vanadium oxide and a composite oxide containing vanadium oxide containing tungsten, and has a phase transition temperature of 10 ° C. One latent heat storage member contains 500 g of a heat storage material. The latent heat storage member is formed to have a thickness of 15 mm, a width of 280 mm, and a length of 180 mm.

One side of the latent heat storage member is adhered to the surface of one of the metal outer skins on the core material side with a urethane adhesive (two-component type). A release agent containing petroleum naphtha is applied at 2 to 3 g / m ² on the other side of the latent heat storage member. There are 20 latent heat storage members in the longitudinal direction of the metal outer skin, the distance between the ends of the latent heat storage members adjacent to each other in the longitudinal direction of the metal outer skin is 90 mm, and the latent heat storage members adjacent to each other in the lateral direction of the metal outer skin. The distance between the ends is 45 mm. Then, one metal outer skin provided with the latent heat storage member and the other metal outer skin not provided with the latent heat storage member are arranged to face each other, and a liquid resin material is supplied between the two metal outer skins, and this resin material is used. By foaming, a core material is formed. The core material foams the resin material at 60 ° C.

In this way, a building panel containing 20 latent heat storage members is formed. In this building panel, the portion of the core material provided with the latent heat storage member becomes a recess, and the space surrounded by the metal outer skin and the recess is formed as a storage space for the latent heat storage member.

(Comparative Example 1)
A building panel is formed by using the same metal outer skin and core material as in Example 1. The building panel is formed under the same conditions as in the first embodiment except that the latent heat storage member is not used in the first embodiment.

(Comparative Example 2)
A building panel is formed by using the same metal outer skin and core material as in Example 1. A building panel is formed under the same conditions except that the heat storage material of the latent heat storage member in Example 1 is changed to a material containing paraffin as a main component designed to have a melting point of 10 ° C. (“CALGRIP” manufactured by JSR Corporation). do.

(Comparative Example 3)
A building panel is formed by using the same metal outer skin, core material, and latent heat storage member as in Comparative Example 2. In Comparative Example 2, one side of the latent heat storage member is bonded to the core material side surface of one of the metal outer skins, and the other surface of the latent heat storage member is bonded to the core material side urethane adhesive (two-component type) to form the latent heat storage member. The building panel is formed under the same conditions except that the release agent is not applied to the other side. In the building panel thus formed, each of the 14 latent heat storage members is adhered to both sides of the surface in contact with the metal outer skin by an adhesive and the core material by the self-adhesive force of the core material.

(Comparative Example 4)
A building panel is formed by using the same metal outer skin, core material, and latent heat storage member as in Comparative Example 2. In Comparative Example 2, the building panel is formed under the same conditions except that the release agent is applied to the entire surface of the latent heat storage member. In the building panel formed in this way, even if each of the 20 latent heat storage members shrinks from the state where the volume is maximum to a temperature lower than the melting point, it adheres to both the metal outer skin and the core material. There is nothing to do.

(Evaluation test)
[Allowable bending stress]
A three-equal two-wire concentrated load loading test was performed. In this case, the building panel is horizontally supported at both ends in the longitudinal direction (support span is 2500 mm), an even load is applied from above to a position 833 mm from each support position of the building panel, and the displacement of the central part of the building panel is displaced. Was measured. Then, the fracture load by this test was measured, the maximum bending stress was calculated using the moment of inertia and the moment of inertia of area, and the allowable bending stress was calculated with the safety factor of 2.

The building panel of Example 1 has an allowable bending stress of 400 to 420 kg / cm ² , the allowable bending stress of the building panel of Comparative Example 1 is 560 kg / cm ² , and the allowable bending stress of the building panels of Comparative Examples 2 to 4 is allowable. The bending stress degree was 370 to 380 kg / cm ² . The degree of bending stress when a person leans against the building panel with full force is about 650 kg / cm ² .

The building panel of Example 1 not only has a bending strength that does not pose a practical problem, but also has a higher bending strength than any of the building panels of Comparative Examples 2 to 4 using paraffin as a heat storage material. In particular, in Comparative Examples 2 to 4 in which paraffin is used as the heat storage material, it is considered that the strength could not be maintained because the volume space differs depending on the phase state of the paraffin substance and extra gaps are formed depending on the bonding method. On the other hand, in Example 1 in which the inorganic heat storage material is used as the heat storage material, it is considered that the latent heat storage member has high strength because it maintains a solid state and the latent heat storage member can be in close contact or contact with each other inside without any gap.

[Temperature control function]
The measurement unit 20 as shown in FIG. 2 was formed. The measuring unit 20 is formed of a box in which an upper plate 21, a lower plate 22, a pair of short side plates 23, and a pair of long side plates 24 are combined. A fluorescent lamp 25 is provided on the lower surface of the upper plate 21. A fan 26 is provided on the upper surface of the lower plate 22. The upper plate 21, the lower plate 22, and the pair of short side plates 23 are formed of the building panel of Comparative Example 1. Then, by forming the pair of long side plates 24 using each of Example 1 and Comparative Examples 1 to 3, the sizes of the plurality of measuring units 20 are 900 mm in height, 570 mm in short dimension, and 1350 mm in longitudinal dimension. Met. Further, the long side plate 24 is formed by cutting the building panels of Examples 1 to 4 and Comparative Examples 1 to 4, and has 10 latent heat storage members 5 built therein. Further, in order to measure the temperature inside the measuring unit 20, a glove thermometer (1) was installed at a position (1) approximately central to the measuring unit 20 (450 mm from the lower surface of the upper plate 21).

Then, the measurement of the temperature control function was performed as follows. First, the inside of the constant temperature and humidity tester containing the measuring unit 20 without the upper plate 21 was stored at 0 ° C. for about 36 hours. Next, the constant temperature and humidity tester was heated from 0 ° C. to 4 ° C., and when this temperature became stable at 4 ° C., the upper plate 21 was attached and the inside of the measuring unit 20 was sealed. Subsequently, the external temperature inside the constant temperature and humidity tester was set to 4 ° C., the temperature inside the constant temperature and humidity tester was stabilized at 4 ° C., and then the temperature was continuously measured for 12 hours. Then, after 12 hours, the switch of the fluorescent lamp 25 was turned on, and after another 12 hours, the switch of the fluorescent lamp 25 was turned off. In this way, after the temperature inside the constant temperature and humidity tester stabilizes at 4 ° C, the switch of the fluorescent lamp 25 is turned on and off every 12 hours for a total of 6 days, and the temperature inside the measuring unit 20, that is, The temperature of the glove thermometer (1) was measured. The results are shown in FIG.

From the graph of FIG. 4, the temperature of the measuring unit 20 rises due to heat generation when the fluorescent lamp 25 is turned on, and when the fluorescent lamp 25 is turned off, the heat generation disappears and the temperature of the measuring unit 20 falls. However, there was a difference in the degree of temperature rise and fall.

In Comparative Example 1 in which the latent heat storage material is not used, the room temperature continues to rise to around 22 ° C. and becomes constant at around 22 ° C. due to the heat generated by turning on the fluorescent lamp, and by turning off the fluorescent lamp, the room temperature is constant. It continued to drop to the temperature inside the constant humidity tester (4 ° C).

In Comparative Examples 2 to 4 using paraffin, the temperature gradually increased to around 17 ° C. by turning on the fluorescent lamp, and decreased to 6 ° C. by turning off the fluorescent lamp. It was confirmed that the temperature difference between the maximum / minimum reached temperature was suppressed by about 7 ° C. as compared with Comparative Example 1 in which the latent heat storage member was not used. However, when the temperature dropped, it dropped sharply up to around 10 ° C, but slowly dropped between about 10 ° C and 6 ° C. It is considered that this is because paraffin changes its state near the melting point (10 ° C.) and the liquid becomes solid, so that the thermal conductivity is further lowered.

On the other hand, in Example 1 containing the inorganic heat storage material, the temperature rises to 16 ° C. (slowly) by turning on the fluorescent lamp, and (slowly) 6 by turning off the fluorescent lamp. It dropped to ° C. It was confirmed that the temperature difference between the maximum / minimum temperature reached was 8 ° C. lower than that of Comparative Example 1 containing no latent heat storage material, and the temperature change could be suppressed. This was because the latent heat capacity of the inorganic heat storage material was equivalent to that of paraffin.

In particular, in Example 1 in which the inorganic heat storage material is used, the thermal conductivity is high, so that the temperature change is considered to be more gradual. Further, by setting the transition temperature of the inorganic heat storage material to 10 ° C., it is considered that the temperature can be kept constant with almost no temperature change in the vicinity of 10 ° C.

[Presence / absence of dents in the metal outer skin]
In the above [Temperature control function], after measuring the temperature change inside the measuring unit 20, the temperature inside the constant temperature and humidity tester was set to −5 ° C., and then the mixture was allowed to stand for 24 hours. Then, after 168 hours from the stabilization at −5 ° C., it was visually confirmed whether or not the metal outer skin dent of the long side plate 24 had occurred.

In Example 1, the metal outer skin of the long side plate 24 did not have a dent, but in Comparative Examples 2 to 4, it was confirmed that the metal outer skin had a dent.

This is because the latent heat storage member is adhered to both the inner surface of the metal outer skin and the core material. Therefore, when paraffin, which becomes a solid state at 10 ° C., is used as the heat storage material, the volume becomes smaller. It is probable that stress was applied to the inside of the metal outer skin, causing a dent. On the other hand, since all of Examples 1 to 4 contain an inorganic heat storage material that causes a solid-solid phase transition, the volume does not change due to a temperature change or a phase transition temperature, and stress may occur. Therefore, it is considered that no dent was generated even if the inside of the metal outer skin and the core material were adhered to each other on both sides. Therefore, the building panel containing the inorganic heat storage material can be used as a building material that does not impair the appearance.

[Heat test (non-combustible test)]
Using the building panels of Example 1 and Comparative Examples 1 to 4, a heat generation test was conducted based on ISO5660-1 and based on the cone calorimeter method. The test results for the building panels in each example and comparative example were evaluated as follows, and it was determined whether or not the building panel had nonflammability and fire resistance. Whether or not it is nonflammable, semi-incombustible, or flame-retardant was judged based on the following evaluations stipulated by the Building Standards Law.
・ Non-combustibility: A combustion test was conducted for 20 minutes, the total heat generation amount was 8 MJ / m ² or less, the maximum heat generation rate was 200 kW / m ² or less, and cracks and holes penetrating to the back side of the building panel were generated. I haven't.
-Semi-incombustible: A combustion test was conducted for 10 minutes, the total calorific value was 8 MJ / m ² or less, the maximum heat generation rate was 200 kW / m ² or less, and there were cracks and holes penetrating to the back side of the building panel. It has not occurred.
-Flame retardant: After a 5-minute combustion test, the total calorific value is 8 MJ / m ² or less, the maximum heat generation rate is 200 kW / m ² or less, and cracks and holes that penetrate to the back side of the building panel. Has not occurred.
-Non-flammable, non-flame retardant: With a burning time of less than 5 minutes, the total heat generation exceeds 8 MJ / m ² , the maximum heat generation rate exceeds 200 kW / m ² , or cracks that penetrate to the back side of the building panel. There is a hole.

It was confirmed that Example 1 containing the inorganic heat storage material had the same degree of nonflammability as Comparative Example 1 containing no heat storage material.

On the other hand, in Comparative Examples 2 to 4 containing paraffin, the nonflammability is lower than that of Comparative Example 1, but the fire resistance / fire protection certification is not particularly required for the building.

From these results, it was found that the building panel containing the inorganic heat storage material has high nonflammability comparable to that of the building panel of Comparative Example 1, and also has excellent heat resistance and fire resistance.

1 Building panel 2 Metal outer skin 3 Metal outer skin 4 Core material 5 Latent heat storage member 9 Heat storage material

Claims (11)

A building panel in which a core material is filled between two metal outer skins and a latent heat storage member is provided between the metal outer skin and the core material.
The latent heat storage member contains an inorganic heat storage material that causes a solid-solid phase transition.
The latent heat storage member is adhered to both the inner surface of the metal outer skin and the surface in contact with the core material.
The core material has heat insulating properties.
Architectural panel. The latent heat storage member has at least one of a substantially rectangular sheet shape and a plate shape.
The building panel according to claim 1. The latent heat storage member has a composition that does not change in volume within a temperature range of −10 ° C. to 70 ° C.
The building panel according to claim 1 or 2. The inorganic heat storage material contains a transition metal compound.
The building panel according to any one of claims 1 to 3. The transition metal compound contains at least one oxide selected from the group consisting of a transition metal oxide and a composite oxide of the transition metal oxide.
The building panel according to claim 4. The phase transition temperature of the transition metal oxide and the composite oxide of the transition metal oxide is in the range of −10 ° C. to 70 ° C.
The building panel according to claim 5. Has nonflammability,
The building panel according to any one of claims 1 to 6. When the building panel having dimensions of 35 mm in thickness, 910 mm in width, and 2700 mm in length is manufactured, the allowable bending stress degree by the trisection two-line concentrated load test is within the range of 400 to 420 kg / cm ² .
The building panel according to any one of claims 1 to 7. When the building panel having dimensions of 35 mm in thickness, 910 mm in width, and 2700 mm in length is produced, the metal outer skin does not have a dent after being held in a constant temperature and humidity tester at −5 ° C. for 168 hours.
The building panel according to any one of claims 1 to 7. The two metal outer skins have a flat shape.
The building panel according to any one of claims 1 to 9. Does not spoil the appearance change,
The building panel according to any one of claims 1 to 10.

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