JP6514908B2 - Thermal insulation structure and phenol foam - Google Patents

Description

  The present invention relates to a thermal insulation structure of a refrigeration storage and a phenol foam used for the thermal insulation structure of a refrigeration storage.

  2. Description of the Related Art Conventionally, in a refrigerated cold storage intended to store frozen food or the like at a low temperature, a normal indoor temperature is below the freezing point, and therefore it is required to have a very high heat insulation structure. Specifically, it is necessary to thermally insulate the warehouse using a heat insulating material having a thickness of about 150 to 300 mm.

  At present, as such a heat insulating structure, for example, a heat insulating structure using an extruded polystyrene foam having a thickness of 150 mm or more is known (see Patent Document 1).

  Moreover, as a heat insulating material for frozen storage containers, it is said that it is preferable that a heat resistance value is 5.0 m <2> K / W or more (refer patent document 2).

JP, 2009-52369, A JP 2013-130032 A

  However, in the above-mentioned thermal insulation structure, the thermal conductivity of extruded polystyrene foam is as high as 0.028 W / mK (see FIG. 2). It was necessary to stack the boards. In this case, the layer thickness of the heat insulation layer is increased, and there is a problem that the available space in the refrigeration storage room becomes narrow.

  In addition, in the warehouse having a certain size, it is obligated under the Fire Service Law to install a sprinkler facility as an indoor fire hydrant facility in principle under the Fire Service Law, but install a sprinkler facility like a refrigeration storehouse where the indoor temperature is below freezing. In the case of a structure that is not suitable, it is exceptionally recognized that fire protection is ensured by covering the heat insulating material with a noncombustible material instead of the sprinkler equipment.

  For example, as shown in FIG. 4, in a conventional heat insulating structure in which a combustible heat insulating material such as extruded polystyrene foam is laminated, a sprinkler is disposed by arranging a noncombustible material such as gypsum board on the indoor side of the heat insulating material. It is possible to secure the fireproofness of the freezer storage without installing the equipment.

  However, in this case, there is a problem that the construction of the heat insulating structure becomes complicated because it is necessary to apply gypsum board or the like which is a noncombustible material separately from the heat insulating material.

  An object of the present invention is to provide a phenol foam which is a heat insulating material having high heat insulation and fire resistance and a heat insulation structure having a thin layer thickness using the phenol foam and a simple construction.

The heat insulating structure of the present invention is a heat insulating structure in which a plurality of heat insulating materials are laminated on the indoor side of the outer wall of a refrigeration storage where the indoor temperature is 10 ° C. or lower, and the inner layer is the heat insulating material disposed most indoorly. A foam, an outer layer foam composed of a sheet of phenol foam, which is the heat insulating material disposed between the outer wall and the inner layer foam, an aluminum foil or an aluminum foil previously laminated on the indoor side surface of the inner layer foam and a non-combustible material layer containing inorganic board, the outer layer form is formed rather thick than the inner layer forms the inner layer forms a limit oxygen index of 28% or more, a thermal conductivity of 0.022W / mK following phenol foam It is characterized in that a total thermal resistance value of the heat insulators which are constituted and laminated in a plurality of sheets is 5.0 m 2 K / W or more.

Further, the heat insulating structure of the present invention is characterized in that it comprises an aluminum foil, and an airtight tape is attached to the joint of the inner layer foam .

The heat insulating structure according to the present invention is a heat insulating structure in which a plurality of heat insulating materials are stacked on the indoor side of the outer wall of the refrigeration storage where the indoor temperature is 10 ° C. or lower. An inner layer foam, an outer layer foam composed of a sheet of phenol foam, which is the heat insulating material disposed between the outer wall and the inner layer foam, and aluminum previously laminated on the indoor side surface of the inner layer foam and a non-combustible material layer comprising a foil or inorganic board, the outer layer form is formed rather thick than the inner layer forms the inner layer forms a limit oxygen index of 28% or more, the thermal conductivity of 0.022W / mK or less of phenol The heat resistance value of the sum total of the said heat insulating material comprised from foam and laminated | stacked several sheets is characterized by more than 5.0 m <2> K / W.

In the heat insulation structure of the present invention, the phenol foam of the present invention is a phenol foam used for the heat insulating material when the room temperature is below the freezing point, and has a limiting oxygen index of 28% or more and a thermal conductivity of 0. It is characterized by being 022 W / mK or less.

  According to the present invention, it is an object of the present invention to provide a phenol foam which is a heat insulating material having high heat insulating property and fire resistance and a heat insulating structure having a thin layer thickness using the phenol foam and a simple construction.

It is a figure showing the heat insulation structure concerning an embodiment. It is a graph which shows the thermal resistance value of the phenol foam used for the heat insulation structure which concerns on embodiment, and the extrusion method polystyrene foam used for the conventional heat insulation structure. It is a figure which shows the construction procedure of the heat insulation structure which concerns on embodiment. It is a figure which shows the conventional heat insulation structure.

  Hereinafter, with reference to the drawings, a heat insulating structure according to the embodiment will be described by taking a wall body that performs heat insulation of a refrigeration storage room having an indoor temperature of about 10 ° C. to −60 ° C. as an example. FIG. 1 is a view showing a heat insulating structure of a wall 2 according to the embodiment. As shown in FIG. 1, the wall body 2 is provided with an RC casing outer wall 4, a moisture-proof layer 6, a heat insulating layer 8, a body rim 9, a fixing screw 11, and a square wave steel plate 12.

  The RC frame outer wall 4 is a reinforced concrete outer wall which constitutes a part of the frame of the refrigeration storage. The moistureproof layer 6 is a sheet that is disposed on the indoor side of the RC casing outer wall 4 and prevents the occurrence of dew condensation on the heat insulating layer 8. Here, the moisture-proof layer 6 in the refrigeration storage is arranged on the outdoor side of the heat insulating layer 8 so that the warm and moist air outside does not enter the heat insulating layer 8. In a general building, the moisture-proof layer is disposed on the indoor side of the heat insulating layer so that warm and moist air in the room does not enter the heat insulating layer.

  The heat insulating layer 8 is a layer of phenol foam disposed on the indoor side of the moisture-proof layer 6, and is composed of a total of two phenolic foams in which the inner layer foam 8b is laminated on the indoor side of the outer layer foam 8a. Phenolic foam A (density 28 kg / m 3 or more, thermal conductivity 0.019 W / m · k, transparent) having a thermal conductivity of not more than 0.0.022 W / mK shown in FIG. 2 is used for the outer layer foam 8 a and the inner layer foam 8 b. Moisture coefficient 25 ng / m 2 · S · Pa or less, Restricted oxygen index 30% or more, pH 5 to 6), Phenolic foam B (density 27 kg / m 3 or more, thermal conductivity 0.020 W / m · k, moisture permeability coefficient 42 ng / m 2・ S · Pa or less, limiting oxygen index 28% or more, pH 5 or less, phenol foam C (density 25 kg / m 3 or more, thermal conductivity 0.022 W / m · k, moisture permeability coefficient 60 ng / m 2 · S · Pa or less, Any one of a limiting oxygen index of 28% or more and a pH of 4 or less is used.

  Further, it is desirable to use a phenol foam thicker than the inner layer foam 8b for the outer layer foam 8a. For example, a phenol foam of 90 mm in thickness is used for the outer layer foam 8a, and a phenol foam of 60 mm in thickness is laminated on the inner layer foam 8b to apply the heat insulating layer 8 having a layer thickness of 150 mm. In addition, you may laminate | stack the thing of the same thickness as the inner-layer foam | form 8c as the outer-layer foam | form 8a.

  Here, as shown in FIG. 2, when using phenol foam A for the outer layer foam 8a and the inner layer foam 8b and setting the layer thickness of the heat insulating layer 8 to 150 mm, the total thermal resistance value of the heat insulating layer 8 is 7.89. It becomes. Moreover, when the layer thickness of the heat insulation layer 8 is 150 mm by using phenol foam B for the outer layer foam 8a and the inner layer foam 8b, the total thermal resistance value of the heat insulating layer 8 is 7.50. Similarly, the total thermal resistance value of the heat insulating layer 8 is 6.82 when the layer thickness of the heat insulating layer 8 is 150 mm using phenol foam C for the outer layer foam 8a and the inner layer foam 8b.

  That is, the thermal resistance value of the heat insulating layer 8 having a layer thickness of 150 mm formed by laminating phenol foams is the same as the heat insulating layer having the same layer thickness (heat resistance value 5.36) formed using extruded polystyrene foam. Will also be high. Thus, the heat insulation of the heat insulation layer 8 can be improved by laminating | stacking a phenol foam and forming the heat insulation layer 8. FIG.

  In addition, since a member having a thickness of 150 mm or more is difficult to produce in the phenol foam shown in FIG. 2, when applying the heat insulating layer 8 having a layer thickness of 150 mm or more, two or more phenol foams are laminated There is a need to.

  Phenolic foam is a non-combustible member having a limiting oxygen index of 28% or more. The limiting oxygen index is the concentration of oxygen required for combustion, and the larger the limiting oxygen index, the harder the component is to burn. A member having a limiting oxygen index of 26% or more is treated as a non-combustible material, and a member having a limiting oxygen index of less than 26% is treated as a flammable material. Further, among phenol foams, Phenobabodo (registered trademark) is a non-combustible member having a limiting oxygen index of 30% or more and high fire resistance. Furthermore, Phenoba board has higher thermal insulation than glass wool and extruded polystyrene foam, and since its pH is almost neutral at 6, even if it is made of metal as fixing screw 11, it does not rust.

  Moreover, the noncombustible material layer 8c is a noncombustible facing material previously laminated on the surface of at least one side of the inner layer foam 8b. That is, the inner layer foam 8b is a composite member comprising the noncombustible material layer 8c and phenol foam. The noncombustible material layer 8c is made of, for example, an aluminum foil having a thickness of 0.03 to 0.2 mm, and the inner layer foam 8b is disposed with the aluminum foil on the indoor side. As a more specific structure of the non-combustible material layer 8c, glass fiber mixed paper, aluminum foil, aluminum hydroxide paper are laminated in this order on the inner layer foam 8b, magnesium silicate, non-woven fabric, aluminum foil on the inner layer foam 8b And the like are laminated in this order, and each layer is adhered via an adhesive layer.

  Here, since the aluminum foil has a large moisture permeation resistance, by disposing the aluminum foil as the non-combustible material layer 8c on the indoor surface of the heat insulating layer 8, it is possible to prevent indoor moisture from entering the heat insulating layer 8. . The moisture permeation resistance value of the aluminum foil is approximately the same as the moisture permeation resistance value of the moisture-proof layer 6.

  Further, by sandwiching the heat insulating layer 8 using the moisture-proof layer 6 and the non-combustible material layer 8 c, it is possible to more effectively prevent moisture from entering the heat insulating layer 8 from inside and outside the room. In order to prevent the infiltration of moisture into the heat insulation layer 8 from inside and outside the room, the non-combustible material layer 8c having aluminum foil may be provided on both sides of the inner layer foam 8b. May be provided with a non-combustible material layer 8c having an aluminum foil. When the non-combustible material layer 8c having aluminum foil is provided on the outdoor side of the outer layer foam 8a, the moistureproof layer 6 between the outer layer foam 8a and the RC outer wall 4 may be omitted.

  As described above, by arranging the noncombustible material layer 8c on the indoor surface of the heat insulating layer 8, it is necessary to separately apply gypsum board, which is a noncombustible material, to the indoor side of the heat insulating layer as in the conventional heat insulating material amount. There is no

  Further, as the non-combustible material layer 8c, a non-combustible inorganic plate (for example, a magnesium silicate plate, a calcium silicate plate or the like) may be used instead of the aluminum foil. The layer thickness of the nonflammable material layer 8c at the time of using an inorganic board as the nonflammable material layer 8c is 1.0-12.0 mm.

  The body edge 9 is a metal member elongated in one direction, and is disposed on the indoor side of the inner layer foam 8 b. The fixing screw 11 is a member for fixing the heat insulating layer 8 to the RC casing outer wall 4, and is pierced into the RC casing outer wall 4 with the body edge 9 penetrating from above the square wave steel plate 12. In this embodiment, since the soft aluminum foil is laminated as the noncombustible material layer 8c, the fixing screw 11 and the body rim 9 can be easily driven in as compared with the case of using a gypsum board, and the gypsum board is broken or crushed. Construction is easy because no pieces are generated.

  The square wave steel plate 12 is a finishing material disposed on the indoor side of the non-combustible material layer 8 c to protect the heat insulating layer 8. By arranging the square-wave steel plate 12 made of metal as a finishing material, for example, when the fork tip of the forklift contacts the wall body 2 at the time of transporting the stored product, the heat insulating layer 8 is prevented from being damaged. Can.

  Next, with reference to FIG. 3, the construction method of the heat insulation structure which concerns on embodiment is demonstrated. First, the worker (1) applies the moisture-proof layer 6 to the indoor side of the RC body outer wall 4. Next, the worker (2) sticks the outer layer foam 8a to the indoor side of the moisture-proof layer 6 using a double-sided tape and an adhesive (not shown). Similarly, (3) the inner layer foam 8b is attached to the indoor side of the outer layer foam 8a using a double-sided tape and an adhesive. Here, as shown in FIG. 1, the worker arranges the inner layer foam 8b so that the position of the joint 8e of the inner layer foam 8b does not overlap with the position of the joint 8d of the outer layer foam 8a. This can prevent moisture from the outdoor side from penetrating into the room through the joint. Next, (4) an airtight tape such as an aluminum tape (not shown) is attached to the position of the joint 8e of the inner layer foam 8b to damp-proof the joint of the inner layer foam 8b.

  Next, (5) the shell edge 9 is disposed on the indoor side of the inner layer foam 8b. Here, the torso edge 9 is disposed, for example, at a pitch of 910 mm in the vertical direction. Next, (6) the square wave steel plate 12 is disposed on the indoor side of the inner layer foam 8b, and (7) the fixing screw 11 is penetrated from the top of the square wave steel plate 12 to the position of the trunk edge 9 to make the tip of the fixing screw 11 Drive into the RC frame outer wall 4. Thus, the heat insulating layer 8 is fixed to the RC casing outer wall 4. The fixing screw 11 is driven, for example, in the horizontal direction along the barrel edge 9 at a pitch of 1200 mm.

  According to the invention according to this embodiment, by using phenol foam having a thermal conductivity of 0.022 W / mK or less and a limiting oxygen index of 28% or more for the heat insulating layer 8, it has high thermal insulation and fire resistance and It is possible to provide a heat insulating structure in which the layer thickness is small and the construction is simple.

  That is, as shown in FIG. 2, since the phenol foam has a heat resistance value higher than that of the extruded polystyrene foam, the heat insulation of the heat insulation layer 8 can be improved by using the phenol foam for the heat insulation layer 8. In addition, since phenol foam is a nonflammable material having a limiting oxygen index of 28% or more, gypsum which is a noncombustible material on the indoor side as in the case of using a flammable extruded polystyrene foam having a limiting oxygen index of less than 26% High fire resistance can be maintained without placing a board.

  Further, since the heat insulation layer 8 can be thinned because phenol foam has high heat insulation and fire resistance, and since it is not necessary to arrange a gypsum board as a noncombustible material as in the prior art, lamination of members in the wall 2 The number can be reduced, and the heat insulation structure with a thin wall thickness can be provided.

  For example, when 90 mm of phenol foam and 60 mm of phenol foam are stacked to form the heat insulating layer 8 (see FIG. 1), three 75 mm extruded polystyrene foams are stacked as in the conventional case and gypsum board is placed indoors The wall thickness of the wall 2 can be reduced by 87.5 mm as compared with the case where the (1) is arranged (see FIG. 4).

  Moreover, by reducing the number of laminated layers of the members in the wall 2, it is possible to provide the wall 2 that requires less work and can be easily installed. In addition, by reducing the wall thickness of the wall 2, the available indoor volume can be increased. Moreover, since the wall body 2 can be reduced in weight by using a phenol foam for the heat insulation layer 8 and not providing a gypsum board, it is possible to improve the earthquake resistance of the refrigeration storage.

  Moreover, since the phenol foam used for the heat insulation layer 8 is a thermosetting resin, when it is heated at high temperature, it does not dissolve and carbonizes. Therefore, when a fire occurs, the position of the square wave steel plate 12 can be held so that the thermal insulation layer 8 is not melted and the square wave steel plate 12 is not collapsed. On the other hand, when an extruded polystyrene foam, which is a thermoplastic resin, is used as a heat insulation layer as in the prior art, when a fire occurs, the extruded polystyrene foam melts with high heat, and the square wave steel plate may collapse.

  Further, unlike the conventional heat insulating structure (see FIG. 4), since no gypsum board is disposed between the heat insulating layer and the square wave steel plate, the square wave steel plate can be disposed while visually checking the body edge. Therefore, the position where the fixing screw is driven can be easily understood, and the installation can be facilitated.

  In the heat insulating structure according to the above-described embodiment, the heat insulating layer 8 is preferably formed by laminating the inner layer foam 8b having a thickness of 50 mm or less on the outer layer foam 8a having a thickness of 66 mm or more. In particular, it is best to form the heat insulating layer 8 by laminating the inner layer foam 8b having a thickness of 35 mm or less on the outer layer foam 8a having a thickness of 80 mm or more.

  When the total thermal resistance of the heat insulating layer 8 is 5.0 m 2 K / W or more, if the phenol foam A is used, the phenol foam B is used so that the thickness of the heat insulating layer 8 is 95 mm or more. For example, if phenol foam C is used so that the thickness of the heat insulation layer 8 is 100 mm or more, the inner layer foam 8 b and the outer layer foam 8 a may be combined so that the thickness of the heat insulation layer 8 is 150 mm or more.

  In the heat insulating structure according to the above-described embodiment, an extruded polystyrene foam or the like which is a conventional heat insulating material may be used as the outer layer foam 8a.

  Moreover, in the heat insulation structure which concerns on the above-mentioned embodiment, the outer-layer foam | form 8a may be comprised by multiple sheets of phenol foam or extrusion polystyrene foam.

DESCRIPTION OF SYMBOLS 2 ... Wall body, 4 ... RC frame outer wall, 6 ... Moisture-proof layer, 8 ... Thermal insulation layer, 8a ... Outer layer foam | form, 8b ... Inner layer foam | form, 8c ... Nonflammable material layer, 12 ... Square wave steel plate

Claims (4)

A heat insulating structure in which a plurality of heat insulating materials are laminated on the indoor side of the outer wall of the refrigeration storage where the indoor temperature is 10 ° C. or less,
The inner layer foam which is the heat insulating material disposed closest to the indoor side, and the outer layer foam which is the heat insulating material disposed between the inner layer foam and the outer wall, the inner layer foam has a restricted oxygen index of 28% or more A phenol foam having a thermal conductivity of 0.022 W / mK or less, and a non-combustible material layer is previously laminated on the indoor surface of the inner layer foam,
Total der thermal resistance 5.0m2K / W or more of a plurality laminated heat insulating material is,
Heat insulating structure the position of joint of the inner foam and wherein Rukoto the inner form is disposed so as not to overlap with the position of the joint of the outer layer form. The heat insulating structure according to claim 1, wherein the non-combustible material layer includes an aluminum foil, and an airtight tape is attached to a joint of the inner layer foam . A heat insulating structure in which a plurality of heat insulating materials are laminated on the indoor side of the outer wall of the refrigeration storage where the indoor temperature is 10 ° C. or less,
An inner layer foam which is the heat insulating material disposed closest to the indoor side, an outer layer foam which is the heat insulating material disposed between the outer wall and the inner layer foam, and which is composed of a sheet of phenol foam, the inner layer And a non-combustible material layer including an aluminum foil or an inorganic plate which is pre-laminated on the indoor surface of the foam,
The outer layer form is formed rather thick than the inner layer forms the inner layer forms a limit oxygen index of 28% or more, consists thermal conductivity of 0.022W / mK or less of phenol foam,
A heat insulating structure characterized in that a total heat resistance value of the heat insulating materials laminated in a plurality of sheets is 5.0 m 2 K / W or more. It is a phenol foam used for the said heat insulating material, when indoor temperature becomes below freezing in the heat insulation structure as described in any one of Claims 1-3 ,
Phenol foam characterized by a moisture permeability coefficient of 42 ng / m 2 · S · Pa or less, a limiting oxygen index of 28% or more, a thermal conductivity of 0.022 W / mK or less, and a pH of 5 to 6.

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