JP2005188714A - Heat insulating panel - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a heat insulating panel lightweight with excellent heat insulating performance, holding high strength and facilitating recycling of a used heat insulating panel. <P>SOLUTION: This heat insulating panel 7 is formed by arranging vacuum heat insulating materials 3 inside a die-molded styrene foam 2, and fixing side plates 5, 5 to skin layers 2a formed on the outer side faces of the styrene foam 2, with adhesives 6. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a heat insulating panel, and more particularly to a heat insulating panel that is lightweight, excellent in heat insulating properties, can retain high strength, and can easily recycle used heat insulating panels.

  FIG. 9 shows an example of a conventional heat insulation panel used for forming a luggage compartment of a cold car, and the conventional heat insulation panel a is between two side plates b and b such as an aluminum plate. In addition, a sandwich panel in which a heat insulating material c made of urethane, polystyrene, phenol resin or the like is bonded with an adhesive d such as an epoxy resin is used.

  The heat insulation panel a that constitutes the luggage compartment (cold storage room) of the cold car needs to have a bending strength characteristic and an impact strength characteristic simultaneously with the heat insulation performance, but the heat insulation material c such as urethane, polystyrene, phenol resin, etc. Is suitable for cold storage because of its excellent heat insulation properties, and as described above, it is adhered to the side plates b and b with the epoxy resin adhesive d to the heat insulating material c made of urethane, polystyrene, phenol resin, etc. Therefore, the sandwich panel has the required bending strength characteristics and impact strength characteristics.

Further, in order to further enhance the heat insulation performance in this type of heat insulation panel, a vacuum insulation material is embedded in a heat insulation material made of rigid urethane foam or the like to form a core material, and an outer plate and an inner plate are formed on both surfaces of the core material. There is a heat insulating panel for a packing box that is attached and formed as a panel material (see, for example, Patent Document 1).
JP-A-10-114245

  When a cold car or the like using the heat insulation panel is used, it is required to recycle the heat insulation panel from the viewpoint of environmental conservation, effective use of materials, and the like. However, since the heat insulation panel a shown in FIG. 9 or the heat insulation panel shown in Patent Document 1 uses a heat insulation material c such as urethane, polystyrene, phenol resin, etc., the heat insulation material c is used even when it is used. It cannot be regenerated by the dissolution method. Therefore, after the used heat insulation panel a is disassembled so as to peel off the side plates b, b on both sides as shown in FIG. 10, the side plates b, b such as aluminum plates are recovered as raw materials. The heat insulating material c such as urethane, polystyrene, phenol resin and the like removed from b is not recycled as a material.

  The above-mentioned heat insulating material c such as urethane, polystyrene, phenol resin is not suitable for use in landfills, etc. Therefore, usually, incineration treatment is performed to partially recover heat, but when it is burned Has problems such as generating harmful gases and damaging the furnace.

  Further, as described above, when the used heat insulation panel a is disassembled and the side plates b, b and the heat insulating material c are separated, the side plates b, b and the heat insulating material c have high adhesive strength by the epoxy resin adhesive d. Since it is bonded, the work of disassembling is very difficult and takes time and labor.

  In view of the above circumstances, an object of the present invention is to provide a heat insulating panel that is lightweight, excellent in heat insulating properties, can retain high strength, and can easily recycle used heat insulating panels.

  The invention according to claim 1 is characterized in that a vacuum heat insulating material is disposed inside a molded polystyrene foam, and a side plate is fixed to the skin layer formed on the outer surface of the polystyrene foam with an adhesive. , Related to

  The invention according to claim 2 is characterized in that a vacuum heat insulating material is disposed inside the foamed polystyrene so that a columnar strength portion made of foamed polystyrene is formed around the vacuum heat insulating material. , Related to

  The invention according to claim 3 relates to the heat insulating panel according to claim 1 or 2, wherein the thickness of the foamed polystyrene surrounding the vacuum heat insulating material is at least 25 millimeters.

  The invention according to claim 4 relates to the heat insulating panel according to any one of claims 1 to 3, wherein the adhesive is an elastic urethane adhesive.

  The invention according to claim 5 relates to the heat insulation panel according to any one of claims 1 to 4, wherein the heat insulation panel is used for a heat insulation wall for a cold insulation vehicle.

  According to the heat insulation panel of the present invention, since the vacuum heat insulating material is disposed inside the molded polystyrene foam, and the side plate is fixed to the skin layer formed on the outer surface of the polystyrene foam by an adhesive, There is an effect that the heat insulating performance of the heat insulating panel is remarkably enhanced by the vacuum heat insulating material disposed inside.

  In addition, since the side plate is bonded to the flat skin layer of the molded polystyrene foam with an adhesive, the adhesive strength, which was a weak point of polystyrene foam, can be greatly increased, and the bending strength of the heat insulation panel can be effectively increased. is there.

  Since the vacuum heat insulating material is disposed in the foamed polystyrene so that the columnar strength portion made of the expanded polystyrene is formed around the vacuum heat insulating material, the columnar strength portion has an effect of further improving the bending strength of the heat insulating panel.

  Since the thickness of the foamed polystyrene surrounding the vacuum heat insulating material is at least 25 millimeters or more, there is an effect that the foamed polystyrene can be prevented from being deformed even when a load is locally applied to the heat insulating material.

  Since the side plate is fixed to the skin layer that forms the flat surface of the polystyrene foam using an elastic urethane adhesive, the operation for peeling the side plate and the polystyrene foam can be done relatively easily when the heat insulation panel is discarded. effective.

  Even when the heat insulation panel used for the heat insulation wall of the cold car is used up, the foamed polystyrene after being disassembled can be dissolved by bringing it into contact with limonene. Therefore, the limonene is removed from the solution. Styrene can be recovered, styrene can be reused as a raw material, and the vacuum heat insulating material taken out by dismantling can be reused as it is.

  Embodiments of the present invention will be described below with reference to the accompanying drawings.

  1 to 3 show a heat insulating body 1 constituting the heat insulating panel of the present invention, FIG. 1 is a plan view of the heat insulating body 1, FIG. 2 is a view taken in the direction of arrows II-II in FIG. 1, and FIG. 2 is a partially cut side view showing a part of the body 1. FIG. The heat insulator 1 has a configuration in which a required number of vacuum heat insulating materials 3 are arranged inside a molded polystyrene foam 2 (polystyrene foam) so that the plane of the vacuum heat insulating material 3 is parallel to the plane of the polystyrene foam 2. . Although FIG. 1 shows the case where four rectangular vacuum heat insulating materials 3 are arranged inside the polystyrene foam 2, the number of the vacuum heat insulating materials 3 can be arbitrarily selected.

  At this time, the vacuum heat insulating material 3 is arranged outside the four sides of the rectangular vacuum heat insulating material 3 so that the columnar strength portions 4 made of the expanded polystyrene 2 are formed, and the bending strength of the heat insulating body 1 is increased.

  Further, by setting the thickness of the foamed polystyrene 2 surrounding the vacuum heat insulating material 3 to be at least 25 millimeters or more, it is possible to prevent deformation even if a local pressure is applied to the foamed polystyrene 2.

As the foamed polystyrene 2, for example, those having characteristic values as shown in [Table 1] can be used.
[Table 1]
Item Unit Value Density Kg / m ³ 20-40
Strength MPa 0.15-0.5
Compression modulus MPa 5-15
Bending strength MPa 0.3-0.8
Flexural modulus MPa 15-40
Thermal conductivity W / mK 0.03 or less

  Side plates 5 and 5 such as aluminum plates are disposed on both outer side surfaces of the heat insulating body 1 configured as described above so as to sandwich the heat insulating body 1 as shown in FIG. 4, and the side plates 5 and 5 are attached to the skin layer of the polystyrene foam 2. A heat insulating panel 7 shown in FIG. 5 is formed as a sandwich panel by being fixed to 2 a with an adhesive 6.

  Since the molded polystyrene foam 2 has a skin layer 2a formed of a smooth surface having a high density at the boundary surface with the mold as shown in FIG. 3, the skin layer 2a is provided with a skin layer 2a. The side plates 5 and 5 are bonded with an adhesive 6.

  It is preferable to use an elastic urethane adhesive 6a having a required elasticity as the adhesive 6 for bonding the skin layer 2a of the foamed polystyrene 2 to the side plates 5 and 5.

  Various attempts have been made in the past to use styrene foam for a heat insulating panel of a cold car. However, conventionally, a cut foamed polystyrene 2 'cut out to a required size as shown in FIG. 6 from a foamed polystyrene molded body previously formed in a large size has been used. Therefore, the conventional cut foam 2 'does not have a skin layer on the mold boundary surface, and the cut surface has a concavo-convex shape. It is considered that 'cannot be bonded to the side plate with a strong strength, and therefore it is considered that the sandwich panel cannot hold a sufficient bending strength. For this reason, the use of foamed polystyrene for a heat insulating panel has not been put into practical use.

  On the other hand, in the present invention, by using the foamed polystyrene 2 produced by mold molding as described above, the side plates 5 and 5 are bonded to the skin layer 2a forming the flat surface of the foamed polystyrene 2 with the adhesive 6, The adhesive strength between the expanded polystyrene 2 and the side plates 5 and 5 can be greatly increased, and thus the bending strength of the sandwich panel can be kept high.

  FIG. 7 shows an example in which the heat insulation wall 9 of the cold insulation vehicle 8 is configured by the heat insulation panel 7 configured as shown in FIG. 5 using the heat insulator 1 of FIG.

  The insulation wall used in the heat insulation wall 9 of the cold insulation car 8 is applied to the heat insulation wall 9 of the cold insulation car 8 because the impact load due to the load to be loaded and the load applied to the lashing rail for restraining the luggage attached to the inner surface of the heat insulation wall 9 act. 7 needs to have a strength that does not deform due to these loads.

The heat insulation wall 9 of the ordinary cold car 8 is designed to have a bending strength that can withstand a load of 1000 kgf. Therefore, as an example for maintaining this bending strength, as shown in FIG. 1, four vacuum heat insulating materials 3 having a size of A = 1090 mm in length and B = 470 mm in width are used, and L1 = 3000 mm in length by using polystyrene foam 2. The dimensions of the columnar strength portions 4 (C, D, E, F) in the case of constituting the heat insulating body 1 with the lateral L2 = 1500 mm and the thickness L3 = 100 mm are shown in [Table 2] below.
[Table 2]
Part Dimensions (mm) Remarks A 1090 Vacuum insulation material dimensions B 470 Vacuum insulation material dimensions C 100 to 120 Panel edge D 60 to 100 Panel center E 38 Panel edge F 74 Panel center G 35 Surface / vacuum Between insulation materials

  In addition, the heat insulating body 1 of FIG. 1 has shown the case where it comprises so that the area of the vacuum heat insulating material 3 may become 45% by area ratio with respect to the area of the plane of the polystyrene foam 2. FIG.

  Further, in order to prevent the foamed polystyrene 2 from being deformed when a local pressure is applied to the foamed polystyrene 2, the thickness of the foamed polystyrene 2 surrounding the vacuum heat insulating material 3, particularly the plane of the heat insulating body 1 is used. The thickness G of the polystyrene foam 2 positioned on the front and back of the vacuum heat insulating material 3 in the vertical direction was set to at least 25 millimeters.

  As described above, the columnar strength portion 4 is formed by the foamed polystyrene 2 on the outer sides of the rectangular four sides of the vacuum heat insulating material 3, and the thickness of the foamed polystyrene 2 surrounding the vacuum heat insulating material 3, particularly with respect to the plane of the heat insulating body 1. In order to maintain the strength of the heat insulating panel 7 by using the foamed polystyrene 2, it is important that the thickness G of the foamed polystyrene 2 positioned on the front and back of the vacuum heat insulating material 3 in the vertical direction is at least 25 millimeters or more.

  In addition, the heat insulation panel of this invention can be manufactured as follows. First, a foamed polystyrene molded body for positioning previously formed on the outer peripheral four sides of the vacuum heat insulating material is attached, the vacuum heat insulating material is positioned and arranged inside the mold, the mold is then closed, and the vacuum heat insulating material inside the mold By filling the external space with the expanded polystyrene raw material, and subsequently expanding the expanded polystyrene raw material by adding water, a heat insulating body is formed in which a vacuum heat insulating material is disposed inside and a skin layer is formed on the outer surface. Subsequently, after opening the mold and taking out the heat insulator 1 shown in FIGS. 1 to 3 from the mold, elastic urethane is applied to the skin layer 2a formed on the outer surface of the foam 2 of the heat insulator 1 as shown in FIG. The heat insulating panel 7 of FIG. 5 is manufactured by fixing the side plates 5 and 5 using the adhesive 6 by the adhesive 6a.

  Next, the operation of the above-described embodiment will be described.

  According to the heat insulating panel 7 of the present invention shown in FIG. 5, since the vacuum heat insulating material 3 is disposed inside the foamed polystyrene 2 held by the side plates 5, 5, Thermal insulation performance can be remarkably enhanced.

  That is, the conventional heat insulation panel a which fixed the side plates b and b to the heat insulating material c shown in FIG. 9, and the vacuum heat insulating material 3 is arrange | positioned inside the foamed polystyrene 2 shown in FIG. The heat insulation panel 7 of the present invention to which 5 was fixed was manufactured with the same dimensions, and the heat insulation performance was compared. In the heat insulating panel 7 of the present invention, the vacuum heat insulating material 3 is arranged so that the area ratio is 45% with respect to the area of the plane. As a result, it has been found that the heat insulating panel 7 of the present invention can exhibit a remarkably high heat insulating performance of about 10 times that of the conventional heat insulating panel a even when the vacuum heat insulating material 3 is arranged at an area ratio of 45%.

Further, since the side plates 5 and 5 are bonded to the skin layer 2a of the foamed polystyrene 2 with the adhesive 6, the foamed polystyrene 2 and the side plate, which are weak points of the foamed polystyrene 2, are increased by increasing the adhesion area of the foamed polystyrene 2 to the side plates 5 and 5. The adhesive strength of 5 and 5 could be greatly increased. As described above, the adhesive strength between the expanded polystyrene 2 and the side plates 5 and 5 is enhanced, and the bending strength characteristic (generally 30 to 60 N / cm ² ) of the expanded polystyrene 2 is used to further synergize with the side plates 5 and 5. Thus, the bending strength of the heat insulation panel 7 can be significantly increased.

  Furthermore, since the vacuum heat insulating material 3 is disposed on the foamed polystyrene 2 so that the columnar strength portion 4 made of the expanded polystyrene 2 is formed around the vacuum heat insulating material 3, the columnar strength portion 4 can further increase the bending strength of the heat insulating panel 7. it can.

  Further, the thickness of the foamed polystyrene 2 surrounding the vacuum heat insulating material 3, particularly the thickness G of the foamed polystyrene 2 positioned on the front and back of the vacuum heat insulating material 3 in the direction perpendicular to the plane of the heat insulating body 1 is at least 25 millimeters or more. Even if the heat insulating body 1 is locally pressurized, the foamed polystyrene 2 can be prevented from being deformed.

  Furthermore, the use of the elastic urethane adhesive 6a as the adhesive 6 causes the elastic urethane adhesive 6a to be deformed when a local pressure is applied to the heat insulating body 1, whereby the adhesive 6 and the expanded polystyrene 2 It is possible to prevent the problem of lowering the adhesiveness.

  Therefore, according to the heat insulation panel 7 of the present invention described above, the heat insulation performance can be remarkably improved by disposing the vacuum heat insulating material 3 inside the foamed polystyrene 2, and at the same time, the bending strength characteristics and the impact strength characteristics can be improved. it can.

  Accordingly, the heat insulation panel 7 can be suitably used for the heat insulation wall 9 of the cold car 8 as shown in FIG. 7 and can exhibit a significantly high heat insulation performance. Large storage space for the storage room.

  As shown in FIG. 7, when the heat insulation panel 7 used for the cold car 8 or the like is used, it can be recycled as follows.

  The used heat insulation panel 7 is disassembled by peeling off the side plates 5 and 5 on both sides. At this time, the adhesion by the elastic urethane adhesive 6a is relatively easy to peel as compared with the conventional adhesion by the epoxy resin adhesive d shown in FIG. 9, and therefore the side plates 5, 5 such as an aluminum plate, The vacuum heat insulating material 3 and the polystyrene foam 2 can be efficiently separated and recovered.

  The recovered expanded polystyrene 2 is put into a container 10 shown in FIG. 8 and dissolved by contacting with limonene 11. Limonene 11 has a molecular structure very similar to that of styrene and has a very high affinity and dissolves styrene foam 2 very well. Styrofoam 2 having a thickness of about 5 cm can be dissolved in a few minutes. The main component of orange oil extracted from dried tangerine peels such as summer mandarin orange and Iyokan is α-limonene, and the limonene 11 thus obtained can be used for dissolving the foamed styrene 2. In addition to the limonene 11, the orange oil may be used as it is for dissolving the polystyrene foam 2.

  As described above, since the expanded polystyrene 2 is easily decomposed and liquified by the limonene 11, styrene can be recovered by dissolving the used expanded polystyrene 2 with the limonene 11 and removing the limonene 11 from the dissolved solution. Reusable as raw material.

  The recovered vacuum heat insulating material 3 can be reused as it is.

  In addition, the heat insulation panel of the present invention is not limited to the above-described embodiment, and the shape of the heat insulation panel can be variously changed, and can also be applied to heat insulation of a wall surface of an automobile other than a cold car or other places. As the adhesive, other than the elastic urethane adhesive can be used, but an adhesive having elasticity is preferable, and it is needless to say that various changes can be made without departing from the gist of the present invention.

It is a top view of the heat insulator which comprises the heat insulation panel of this invention. It is an II-II direction arrow line view of FIG. It is a partial cutting side view showing a part of heat insulator. It is sectional drawing which shows the state which adhere | attaches a side plate to a heat insulating body. It is a partial cutting side view showing a part of example of a heat insulation panel of the present invention. It is a partial cutaway side view showing a part of polystyrene foam considered use conventionally. It is a side view of the cold storage vehicle which applied the heat insulation panel of this invention to the heat insulation wall. It is explanatory drawing which shows the state which melt | dissolves the expanded polystyrene with limonene. It is a side view showing a part of conventional heat insulation panel. It is a side view which shows the state which has disassembled the conventional heat insulation panel.

Explanation of symbols

DESCRIPTION OF SYMBOLS 2 Styrofoam 2a Skin layer 3 Vacuum heat insulating material 4 Columnar strength part 5 Side plate 6 Adhesive 6a Elastic urethane adhesive 7 Heat insulation panel 8 Cold truck 9 Heat insulation wall

Claims (5)

  A heat insulating panel, wherein a vacuum heat insulating material is disposed inside a molded polystyrene foam, and a side plate is fixed to the skin layer formed on the outer surface of the foamed polystyrene by an adhesive.   The heat insulation panel according to claim 1, wherein a vacuum heat insulating material is disposed inside the foamed polystyrene so that a columnar strength portion made of the foamed polystyrene is formed around the vacuum heat insulating material.   The insulation panel according to claim 1 or 2, wherein the thickness of the foamed polystyrene surrounding the vacuum insulation material is at least 25 millimeters or more.   The heat insulation panel according to any one of claims 1 to 3, wherein the adhesive is an elastic urethane adhesive.   The heat insulation panel according to any one of claims 1 to 4, wherein the heat insulation panel is used as a heat insulation wall for a cold car.

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