JPH08336922A - Heat insulation panel and heat insulation box - Google Patents

Abstract

PURPOSE: To rigidly stick the outer wall material of a heat insulation panel to a heat insulation material, maintaining the heat insulation and strength, reducing the thickness and weight, maintaining the heat insulation and rigidity at a heat insulation box using the panel, reducing the thickness of the panel of the sidewall without increasing the weight, and increasing the width of a container. CONSTITUTION: The heat insulation panel is obtained by sticking metal plates 1, 2 made of aluminum to both the surfaces of a closed-cell polyurethane foamed heat insulator 3 by using one-can moisture curable urethane bonding agents 4, 5 having a volatile component of 6% or less. The heat insulation box obtained by forming four sides by the panels of the heat insulation panel in which the thickness of the heat insulator of the sidewall is set smaller by 20% or more than that of the heat insulator in which the bulk density of the heat insulator of the sidewall is set 40kg/cm<3> or less and the thickness of the heat insulator of the sidewall is set to 35kg/cm<3> or less as the box for an automobile.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat insulating panel used for a container or the like for storing articles or the like that require freezing or cooling, and a heat insulating box using this panel.

[0002]

2. Description of the Related Art In general, a heat insulating box for storing articles which need to be frozen or kept cold has a structure in which a heat insulating panel having a sandwich structure in which a plastic foam material is adhered to the middle of an outer wall material inside and outside is combined with an appropriate reinforcing material. The strength is maintained by this, and the same sandwiched door with a heat insulating structure is provided.

FIG. 4 shows a cross section of the heat insulating box. FIG. 4B shows a cross section of a conventional heat insulating box, and the side plates 34 and 35, which are heat insulating panels, the roof plate 36, and the floor plate 37 are generally formed to have the same thickness. FIG. 5: is sectional drawing which shows the structure of the conventional heat insulation panel. FIG. 5A shows outer wall members 40 and 4.
An aluminum plate (hereinafter, referred to as an Al plate) is used as 1, and a polystyrene foam (hereinafter,
PS foam) is provided and bonded, and a polysulfone-based adhesive or a rubber-based adhesive is used as the adhesive 43, 44. FIG. 5B shows a structure in which FRP, which is an unsaturated polyester resin reinforced with glass fiber, is used as the outer wall members 45 and 46, and a closed-cell polyurethane foam (hereinafter, referred to as PUR foam) is provided as the heat insulating material 47 in the middle and bonded. A polyester adhesive is used as the agents 48 and 49. Both adhesives are diluted with an organic solvent, and the adhesive is applied in a state where the organic solvent remains after application. In the case shown in FIG. 5A, the residual solvent penetrates into the PS foam of the heat insulating material 42 and is shown in FIG. 5B. Then, the residual solvent permeates the FRP of the outer wall materials 45 and 46. This penetration prevents adhesion failure due to the residual solvent and improves the adhesion due to the penetration effect.

FIG. 7 is a perspective exploded view showing a heat insulating box for a freezer or a refrigerator mounted on a luggage carrier of an automobile. 60,6
1 is a side plate composed of any of the above heat insulating panels, 62
Is a roof plate, 63 is a floor plate, 64 is a front plate, 65 is a door frame having a heat insulating material inside, and 66 and 67 are heat insulating double doors. 68 is an aluminum striped plate that constitutes the floor,
69 is a reinforcing plywood material provided below it. Each of the above-mentioned members, together with the other members shown in the figure, is configured as a heat insulating box by an appropriate joining method and joining parts, is attached to the subframe as shown in the figure provided at the bottom, and is structured to be loaded on the frame of the automobile. There is.

In Japanese Patent Laid-Open No. 4-345678, a one-component moisture-curable adhesive is applied to at least one of the adhesive surfaces,
It describes a method for manufacturing a civil engineering and building composite member in which a foreign material is applied to a panel base material after being left for a predetermined time. Further, JP-A-5-163477 discloses a method for adhering a floor material in which a PVC floor material (P tile) is attached to the floor by using a one-component solventless urethane adhesive. By setting the volatile content of the above to 5% or less, there is no odor of organic solvent in the room and comfortable work can be performed.

In Japanese Utility Model Laid-Open No. 4-135621, a plate-shaped core material and a metal skin material covering both surfaces of the core material are used, and at least one of both surfaces of the core material is made of an epoxy-based elastic adhesive. An insulation panel is described that is adhered to the skin.

[0007]

In the heat insulating panel in which the Al plate outer wall material and the PS foam heat insulating material shown in FIG. 5A are adhered, the heat conductivity of PS foam used as the heat insulating material is PUR.
Since it is inferior to the foam, the thickness of the heat insulating material needs to be 20 to 30% larger than that of the PUR foam in order to obtain a predetermined heat insulating effect. On the other hand, in the case where the FRP outer wall material and the PUR foam shown in FIG. 5B are adhered, the thickness of the heat insulating material can be reduced, but the strength of the FRP is inferior, so that the wall thickness of the FRP is increased and the reinforcing material for securing the rigidity. And the resulting increase in weight. In addition, PUR foam with excellent heat insulation effect and Al with high strength as outer wall material
Insulating panels made of plates have a permeation of the volatile components of the organic solvent that dilutes the adhesive that adheres them to the Al plate outer wall material and PUR.
It does not perform well on both sides of the foam and interferes with the curing of the adhesive, failing to obtain strong adhesion.

In particular, in a heat insulating box for a freezer or a refrigerator mounted on a bed of an automobile, an increase in the thickness of the heat insulating panel reduces the space volume in the heat insulating box, and an increase in the weight causes a decrease in the load weight. It will be. Further, in the case of a freight vehicle, there is a great need to reduce the thickness of the side wall heat insulation panel in terms of vehicle width regulation.

Those described in the above-mentioned JP-A-4-345678 and JP-A-5-163477 are civil engineering,
It is related to workability on the construction site, does not disclose the solution to the above problems when it is configured as a heat insulating box having strength as a heat insulating panel. Also, the actual Kaihei 4-13
The heat-insulating panel described in Japanese Patent No. 5621 deals with warpage of the heat-insulating panel and separation of the core material and the skin material due to a difference in temperature between the inside and the outside as the heat-insulating panel, and suggests a reduction in thickness and weight, which is an object of the present invention. Not a thing.

The present invention maintains a predetermined heat insulating property and strength,
Moreover, it is an object of the present invention to provide a heat insulating panel capable of reducing thickness and weight, and to widen a storage portion of a heat insulating box formed by using this heat insulating panel.

[0011]

The heat insulating panel of the present invention comprises:
A metal foam plate, such as an aluminum plate, is bonded to both sides of a closed-cell polyurethane foam using a one-component moisture-curable urethane adhesive with a volatile content of 6% or less. Is preferably 2 to 5%.
In the heat insulation box forming four circles using this heat insulation panel, the thickness of the closed-cell polyurethane foam material on the side wall is smaller than the thickness of the closed-cell polyurethane foam material on the ceiling and floor. Further, the bulk density of the closed-cell polyurethane foam material on the side wall is set to 40 kg / m ³ or more, and the thickness thereof is set to 35 kg / m ³ or less on the ceiling and floor. The thickness is 20% or more than the thickness of the closed-cell polyurethane foam material. A small heat insulation panel for automobiles.

[0012]

The heat insulating panel is strong and durable and is not affected by the volatile components of the diluent in the adhesive. The thermal insulation box maintains the overall thermal insulation and rigidity, the thickness of the side wall can be reduced without increasing the weight, and the space volume in the thermal insulation box is increased.

[0013]

1 is a sectional view showing an embodiment of a heat insulating panel of the present invention. In FIG. 1, 1 and 2 are outer wall materials of Al plate, and 3 is P
UR foam heat insulating materials 4 and 5 are adhesive layers obtained by curing a one-component moisture-curable polyurethane adhesive containing 6% or less of an organic solvent. General aluminum and aluminum alloy wrought materials are used for the outer wall materials 1 and 2 of the Al plate, but to obtain a highly rigid wall material, a highly rigid Al plate, for example, JI
SH400 A5052P-0, A5052P-H3
4, A5052P-H38, A5083P-0, A50
83P-H32 is desirable. Further, in order to stabilize the adhesiveness, it is desirable to provide a resin film layer on the adhesive surface of the Al plate. The material of this film layer is preferably polyester or epoxy, and the film thickness is 5 to 20 μm.
The ones are general. The heat insulating material 3 is a cutout product from a closed-cell type hard PUR foam slab product or a continuous molded product having a constant wall thickness, and aluminum foil or the like is attached to both surfaces, and the expansion ratio is a bulk density of 25 to 60 kg. / M ³ is excellent in heat insulation, so select from among them according to the rigidity required for heat insulation panels. In order to further stabilize the adhesive performance, it is desirable to use a one-component moisture-curable polyurethane adhesive mixed with a polyol.

The test of the heat insulating panel of the above-mentioned embodiment and the result will be described below. The test is a shear peeling test and a bending test of the plate, and all the outer wall materials of the test piece are Al plates (J
IS-H400 A5052P-H34), and the heat insulating material is closed-cell PUR foam (R40 manufactured by Kurabo Industries, Ltd.)
3) foaming ratio (hereinafter referred to as bulk density) 25 Kg / m
Using ^three ones, and adhesive resin film layer of Al plate are set forth in Table 1 to Table 4 and note below test results.

First, the shear peeling test method will be described. FIG. 2A shows the state of the shear peeling test. The test pieces 6 and 7 are Al plates of the above material and have a size of 100 × 25 × 1 mm, and the heat insulating material 8 is the above material and has a size of 25 × 25 × 10 mm. The test piece was prepared by setting the amount of adhesive applied to 0.1 to 0.5 g / 25 × 25 mm, applying the adhesive to the Al plate, then adhering the heat insulating material, and applying the adhesive to the upper surface of the heat insulating material. The order is to attach the Al plate later. After bonding, put a weight of 100-300g on the bonding site,
After leaving it at 65 ° C and 65% RH for 2 days, and at 80 ° C-
168H, 40 ℃ in hot water-168H, 50 ℃ -100% R
The test was performed with the accelerated aging in the environment of H-168H. The shear peel test is 200 in the direction of the arrow in FIG. 2A.
Forced displacement was given at a speed of mm / min, and the fracture mode and load generated were recorded.

FIG. 2B shows a bending test method. This bending test complies with the three-point bending test method of JIS-K7203K. The test piece 10 is supported by pedestals 11 and 12 fixed at 160 mm intervals, and the ram 13 is held. Is 5 in the direction of the arrow
Apply a load at a speed of mm / min. The maximum displacement of the ram 13 is 50 mm. If the test piece breaks in the middle, the ram 13 is interrupted midway. Deformation state of the test piece after the test,
We observe the peeled state of the adhesive and record images. The test piece is a 900 x 1800 x 1 mm Al plate
A PUR foam having a size of × 1800 × 45 mm was entirely adhered to both sides, and after the adhesion, a weight equivalent to about 500 Kgf / m ² was placed and left for 7 days or more, and then cut into a size of 50 × 200 mm.

FIG. 3 shows the deformation state of the test piece after the bending test, and shows three modes of the test result. FIG.
A is a test piece using the outer wall materials 21 and 22 of FRP having a thickness of 2 mm. The heat insulating material 20 and other conditions are the same as those of the above-mentioned test piece, and show the deformation state, and the outer wall material 22 and the heat insulating material are shown. No. 20 peels off the adhesive interface on the entire surface, and the heat insulating material 2
0 is broken, and the outer wall material 21 of the FRP is also cut. Items in this state are marked with x in the evaluation symbols in Tables 1 to 4 below. 3B and 3C show the deformation states of the test pieces of the following Examples and Comparative Examples. Partial peeling occurs at a site near the outer wall material 23 of the Al plate of FIG. 3B, and the heat insulating material 20 is destroyed. The peeling between the Al plate 24 and the heat insulating material 20 is small.
Items in this state are indicated by Δ in the evaluation symbols in Tables 1 to 4 below. In FIG. 3C, the outer wall members 23, 24 of Al plates are used.
Although the heat insulating material 20 and the heat insulating material 20 are deformed to some extent,
The insulation and outer wall materials are in a buckled state without breaking or breaking. What is in this state is evaluated by the evaluation symbols in Tables 1 to 4.
And

As the plate test of the heat insulating panel, a heat aging test was performed in addition to the bending test. In the heat aging test, the test piece is heated at 85 ° C.-48 H and then visually evaluated. Tables 1 to 4 below show the results of evaluation of the shear peeling test, the bending test and the heat aging test of test pieces under various adhesion conditions.

[0019] 1. No. 1 to No. 3 show examples, and No. 4 shows a comparative example, and the adhesives are all one-component moisture-curable polyurethane adhesives. 2. In the results of the shear peeling test, ◯ indicates the breakage of the heat insulating material, Δ indicates the breakage of the heat insulating material surface layer, and x indicates the interface peeling between the Al plate and the heat insulating material. (Common to Tables 2 to 4) 3. In the 85 ° C. aging test result, ○ indicates no abnormality, Δ indicates partial peeling, × indicates entire peeling, and ○ to × indicate that they vary depending on the bonding conditions. (Common to Tables 2 to 4) In the bending test results, ○ indicates buckling without peeling, Δ indicates partial peeling, and × indicates full peeling. (Common to Tables 2 to 4) As for the superscript A of the Al surface coating, the undercoat is SPD IFH-10 manufactured by Nippon Paint Co., Ltd. and the thickness is about 7 μm, and the topcoat is DIFJ-15 manufactured by Nippon Paint Co., Ltd. and the thickness is about 8 μm. Superscript B is KP-8704DE manufactured by Kansai Paint Co., Ltd. and has a thickness of about 5 μm. As for the superscript C, the undercoat is Prasaf 029-1940 manufactured by Rock Paint Co., Ltd., and the top coating is Panalock 088 manufactured by Rock Paint Co., Ltd., and the total thickness is about 15 μm. 6. Penguin Cement # 933 is manufactured by Sunstar Giken Co., Ltd. 7. Xylene is used as a diluent for the organic solvent, and No. 4 was 8% by adding xylene to Penguin Cement # 933 (diluent 3 to 4%) afterwards.

[0020] 1. No. 1 to No. 3 show examples, which are 1-component moisture-curable polyurethane adhesives to which 1/10 of polyol was added. No. 4 to No. 5 show comparative examples and indicate one-component chloroprene-based adhesives. 2. The contents of the display symbols of each test result and the superscripts of Al coating are the same as those described in the note of Table 1. 3. No1 to No3 adhesives are manufactured by Sunstar Giken Co., Ltd.

[0021] 1. No. 1 to No. 3 show examples, and a one-component moisture-curable polyurethane adhesive was used, and No. 4 to No. 5 were comparative examples, and a two-component epoxy adhesive was used. 2. The contents of the display symbols of each test result and the superscripts of Al coating are the same as those shown in Table 1. 3. The No. 1 and No. 2 adhesives are manufactured by Nippon Seeker Co., Ltd., No. 3 is manufactured by Sunstar Giken Co., Ltd., and No. 4 and No. 5 are manufactured by Sekisui Chemical Co., Ltd.

[0022] 1. No. 1 shows an example, and others show comparative examples. 2. No. 1 to No. 3 are one-component moisture-curable polyurethane adhesives, and No. 4 to No. 5 are two-component vinyl ester adhesives. 3. The contents of the display symbols for each test result and the superscripts of Al coating are the same as those shown in Table 1. 4. No1 to No3 adhesives are manufactured by Konishi Co., Ltd., and No4 to No5 adhesives are manufactured by Nippon Fellow Co., Ltd.

From the examples of Tables 1 to 4 described above, the heat insulating material of Al outer wall plate and closed cell PUR foam is used, which is a one-component moisture-curable polyurethane adhesive containing 6% or less of a diluent. The adhered heat insulating panel can obtain a strong and durable adhesive that is not affected by the volatile component of the diluent, and when the polyol is mixed in the adhesive, the component of the diluent is further reduced, Moreover, the curing acceleration action works and the stability of the adhesive is improved. It is desirable that the outer wall material of the Al plate has a high rigidity. In order to stabilize the adhesiveness, it is desirable to provide a resin coating layer having a thickness of about 10 μm on the adhesive surface. It is desirable to apply a primer coating exclusively for the board. The insulating material is a closed-cell hard material, PUR foam, with a bulk density of 25-60K.
intended g / m ^3, can be selected in accordance with a predetermined stiffness from the following table 5, wherein ones.

[0024]

Next, a heat insulating box formed by using the above heat insulating panel will be described. In a heat-insulating box for a freezer or a refrigerator mounted on a luggage carrier of an automobile, an increase in the thickness of the heat-insulating panel reduces a space volume in the heat-insulating box, and an increase in the weight causes a decrease in the load weight. Further, in the case of a frozen freight car, there is a great need to reduce the thickness of the side wall heat insulation panel from the viewpoint of vehicle width regulation. Therefore, as shown in FIG. 4A, it is desirable to make the thickness of the side wall heat insulating panels 30 and 31 of the heat insulating box thinner than the heat insulating panels forming the top plate 32, the bottom plate 33, etc. In addition to ensuring heat insulation, it is also necessary to ensure rigidity and reduce weight. Therefore, the thickness and bulk density of the heat insulating material of the heat insulating panel were variously changed, and the rigidity was tested.

The heat insulating material is slab urethane FL-25, FL-30, FL-35 made by Inoac Corporation.
7 of FL-40, FL-45, FL-50, FL-60
The numerical value following FL in type indicates the bulk density (Kg / m ³ ). The thermal conductivity of the heat insulating material is shown in Table 6 below. Table 6 to F
Values other than L-25 are almost the same value, and it is understood that the heat insulating property is determined only by the thickness of the heat insulating material.

[0027] note. The measurement is based on the JIS flat plate comparison method.

The Al outer wall material of the test piece is JIS H4
No. 5052-H34, a commercially available polyester coated product (undercoat: Rock Paint Co., Ltd. Plasaf 029-1).
940, Topcoat: Panalock 0 manufactured by Rock Paint Co., Ltd.
88, a total thickness of 15 μm) is used. The adhesive is a mixture of Penguin Cement # 933 (manufactured by Sunstar Giken Co., Ltd.), which is a one-component moisture-curable polyurethane, with Penguin Hardener # 25 (polyol) being added as a 1/10 component and mixed. The bonding method is as follows. An Al plate is placed on a flat plate, the above adhesive is applied (about 500 g / m ² ), and P
UR foam heat insulating material is stuck and adhesive is similarly applied on it, Al plate is stuck and weight (about 3
00 Kg / m ² ) and was left at room temperature for about 5 hours. All prototypes were 1800 x 900 mm in size, and 50 x 200 mm test pieces were cut out.

FIG. 6 is a graph showing the results of the bending test. The evaluation test is the same bending test as above, and the stroke of the load ram and the load are recorded. The test piece of Comparative Example A indicated by the broken line in FIG. 6 is the same as the cold insulation van manufactured by JC Co., Ltd. in which the heat insulating material is internally reinforced and all the heat insulating panels of the heat insulating box have the same thickness. Cut to size, the outer wall material is FRP with a thickness of 1.5 to 2.5 m
m, insulation is PUR foam with a bulk density of 25 kg / m ³ ,
The thickness is 45 mm, and the adhesive is polyester type. The test piece of Comparative Example B shown by the broken line in FIG. 6 has no internal reinforcement in the heat insulating material, and all the heat insulating panels of the heat insulating box have the same thickness. , Cut out to a size of 50 x 200 mm, A
The plate is equivalent to JIS H400, 5052-H34, and has a thickness of 1 m.
m, heat insulating material is PS foam with a bulk density of 30-35 kg /
m ³ , thickness 50 mm, adhesive is of polysulfone type. Table 7 below shows the symbols ~ attached to each curve in Fig. 6 and the configuration of the test piece.

[0030] note. ~ Is an example, and A and B are comparative examples. None of the test pieces contains a reinforcing material.

From the graph shown in FIG. 6, the comparative example A using the outer wall material of FRP is inferior in rigidity to the embodiment using the outer wall material of Al plate with the same heat insulating material. The maximum load of Comparative Example A and the maximum load of Example show almost the same value, and A is equivalent to the case where the reinforcing material is put in a part of the heat insulating material to form the heat insulating box when used as the side wall of the heat insulating box. By using the same reinforcing material for the heat insulation panel, it is possible to obtain a heat insulation box having the same rigidity as the heat insulation box configured by A. Looking at the weights of the two heat insulating panels, the difference between the weights of the outer wall material of FRP and Al is 2 mm on average for FRP and 1 mm for Al, and the difference between Example and Comparative Example A from the respective specific gravities. , FRP outer wall material: 1.6 g / cm ³ × 0.2 cm × 2 = 0.64 g / cm ² = 6.
4 Kg / m ² Al outer wall material: 2.6 g / cm ³ × 0.1 cm × 2 = 0.52 g / cm ² = 5.
From 2 kg / m ² to 1.2 kg of heat insulation panel using Al material can be reduced per m ² . Further, regarding the heat insulating material, the embodiment has a thickness of 30.
mm, the bulk density is 30 kg / m ³ , and the comparative example A has a thickness of 4
5 mm and bulk density of 25 kg / m ³ , so the heat insulating material is also m ^2.
It is possible to make it lighter. The reinforcing material is not used except for the side wall of the heat insulating box using the heat insulating panel of Comparative Example A, and the heat insulating box having the same rigidity can be formed by using the example.

Comparative Example B using PS foam as a heat insulating material contributes to the thickness of PS foam, exhibits a maximum load of 70 kg or more, has high rigidity, and is used without an internal reinforcing material. Among the examples, the one showing the highest maximum load corresponding to Comparative example B is selected, and the thickness of the heat insulating material and the thickness of the heat insulating material of the bulk density which can be estimated to be the maximum load of 70 kg from these are selected. The following Table 8 shows the density and the weight per unit area of the heat insulating material.

[0033] note. In the examples of No. 5 to No. 8, the curves of load and compression length are not shown in FIG.

From Table 8, the weight of the heat insulating material is lighter than that of Comparative Example B, and the maximum load of 70 kg is No3, No6 and No6.
No.7, and if PUR foam insulation material with a bulk density of 40 kg / m ³ or more is used,
It is possible to construct a lightweight heat-insulating box having rigidity equal to that of the heat-insulating box using the heat-insulating panel of Comparative Example B which is a conventional technique and having a thickness of the heat-insulating panel reduced by 20% or more. On the other hand, when the heat insulating material is made thin, the heat insulating property of the side wall decreases in proportion to the thickness, but in order to prevent this, the roof plate, floor plate, front wall,
It suffices to make the thickness of the heat insulating material of the rear wall thicker than that of the side wall, and it is desirable to use one having a bulk density of 35 Kg / m ³ or less in order to prevent an increase in weight, and the rigidity can be compensated by the thickness.

[0035]

INDUSTRIAL APPLICABILITY The present invention is capable of firmly adhering an Al plate as an outer wall material and a PUR foam as a heat insulating material in a heat insulating panel used for accommodating articles or the like requiring freezing or cold insulation,
It is possible to obtain a heat insulating panel which maintains a predetermined heat insulating property and strength and enables reduction of thickness and weight. In addition, the heat insulation box formed using this heat insulation panel can reduce the thickness of the heat insulation panel on the side wall without increasing the weight while maintaining the overall heat insulation and rigidity, and it is possible to widen the storage section. Become.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of a heat insulating panel of the present invention.

FIG. 2 is a view showing a state of shear peeling and bending test.

FIG. 3 is a cross-sectional view showing a state of the test piece after the bending test.

FIG. 4 is a sectional view of a heat insulating box.

FIG. 5 is a cross-sectional view showing a bonded state of a heat insulating panel.

FIG. 6 is a graph showing the results of a bending test.

FIG. 7 is an exploded perspective view of a heat insulating box.

[Explanation of symbols]

1, 2 Al outer wall material 3 closed cell PUR foam
4,5 1-part moisture-curing polyurethane adhesive

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification number Office reference number FI Technical indication location E04C 2/26 E04C 2/26 V F25D 23/06 F25D 23/06 T (72) Inventor Toshiyuki Kanasaka In the Fujisawa Plant, No. 8 Tsutana, Fujisawa City, Kanagawa Prefecture (72) Inventor Masatoshi Iwao 6-26-1 Minamioi, Shinagawa-ku, Tokyo Isuzu Motors Limited (72) Inventor, Kiyomi Sawada Kanagawa Prefecture No. 8 Tsutana, Fujisawa City Inside Isuzu Central Research Institute Co., Ltd. (72) Inventor Seiro Uranishi 202-4 Oikawa, Atsugi, Kanagawa Prefecture (72) Inventor Masaki Shigemura 2-29-5 Yaguchi, Ota-ku, Tokyo (72) Inventor Hiroshi Usai 734-100 Minami-Nakamaru, Omiya City, Saitama Prefecture (72) Inventor Takahiro Kinoshita 1115-2 Minorita, Matsudo City, Chiba Prefecture (72) Inventor Kazuhiro Fujikusu 1633, Noshu, Noshu-cho, Shiga Prefecture Earth stock company in Jeshi

Claims (5)

[Claims] 1. A heat insulating panel, characterized in that metal plates are bonded to both surfaces of a closed-cell polyurethane foam material using a one-component moisture-curable urethane adhesive having a volatile content of 6% or less. 2. The metal plate is an aluminum plate, and the volatile component of the one-component moisture-curable urethane adhesive is 2 to 5%.
The heat insulation panel according to claim 1. 3. The heat insulating panel according to claim 1, wherein the adhesive surface of the metal plate is coated with a resin. 4. A heat insulation box forming four rounds using heat insulation panels in which metal plates are bonded to both sides of a closed cell polyurethane foam using a one-component moisture-curing urethane adhesive with a volatile content of 6% or less. A heat-insulating box for an automobile, wherein the thickness of the closed-cell polyurethane foam material on the side wall is smaller than the thickness of the closed-cell polyurethane foam material on the ceiling and floor. 5. A closed-cell polyurethane foam material having a bulk density of the closed-cell polyurethane foam material of the side wall of 40 Kg / m ³ or more and a ceiling and floor bulk density of 35 Kg / m ³ or less. The heat insulation box for automobiles according to claim 4, wherein the heat insulation panel is 20% or more smaller.