JP2008208845A - Composite insulation - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a composite heat insulating material using a vacuum heat insulating material which maintains performance with less deformation, even in the condition where a static external force is kept applied to the vacuum heat insulating material for the long term, by increasing the strength of a core material. <P>SOLUTION: The core material 105 of the vacuum heat insulating material 102 is made of glass with high Young's modulus, so that the strength of the core material 105 is increased. Being made using the high-strength core material 105, the vacuum heat insulating material 102 is not deformed even when subjected to the static external force owing to the atmospheric pressure or a foamed resin so as to maintain the performance, so that even the composite heat insulating material 101 in which the vacuum heat insulating material 102 is embedded in the foamed resin heat insulating material 103, prevents the deterioration of performance. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a composite heat insulating material in which a vacuum heat insulating material is embedded in a foamed resin heat insulating material.

  In recent years, vacuum insulation materials have been widely used in refrigerators and vending machines and other freezing and refrigeration equipment, and jar pots and other thermal equipment, greatly reducing the energy consumed by these equipment and greatly improving the energy-saving effect.

  In general, the vacuum heat insulating material used in such applications has a core material for ensuring the strength of the vacuum heat insulating material, a gas barrier property, an outer covering material that covers the core material, and an excess inside the outer covering material. It is composed of a moisture adsorbent that adsorbs moisture. As the core material, fiber systems such as glass wool, rock wool, and ceramic fibers, and powder systems such as amorphous silicon and silica are generally used.

  In addition, as a new application of the vacuum heat insulating material, the use to the wall surface of a container or a transportation vehicle has attracted attention. Conventionally, for such applications, heat insulation performance was ensured by filling urethane foam into the wall surface. However, when improving performance with only urethane foam, it is necessary to increase the wall thickness. There is a concern that the volume in the box will decrease. Therefore, when a vacuum heat insulating material having a heat insulation performance several times to several tens of times higher than that of urethane foam is used in combination, it is effective to ensure the heat insulation performance while the wall thickness is substantially equal.

  For example, there is a heat insulating box body using a vacuum heat insulating material in which a vacuum insulating material having a composite core material is disposed between an inner wall material and an outer wall material of the box body, and polyurethane foam is injected and foamed into a gap. (For example, refer to Patent Document 1).

  FIG. 3 is a plan sectional view showing the internal structure of the side wall of the heat insulating box applied to the container. As shown in FIG. 3, a container C to which a heat insulating box is applied is composed of a side wall 1, a side wall 2, and a side wall 3, and these side walls are inner wall materials 1a, 2a, 3a and outer walls, which are thin metal plates, respectively. It is made of materials 1b, 2b, 3b.

  The vacuum heat insulating material T is disposed in the space between the inner wall materials 1a, 2a, 3a and the outer wall materials 1b, 2b, 3b, and the open-cell hard plastic foam 5 as a core material in the bag body of the gas barrier film. And the inorganic material 6 are housed, and the inside thereof is decompressed and sealed. Glass fiber or inorganic powder is often used for the inorganic material 6. The vacuum heat insulating material T is determined depending on whether the container C is placed inside or outside the high temperature environment, and the side on which the inorganic material 6 is laminated is disposed on the high temperature side.

  The foamed polyurethane resin U is injected between the inner wall materials 1a, 2a, 3a and the vacuum heat insulating material T in order to fix the vacuum heat insulating material T disposed in the respective side walls 1, 2, 3, and filled with foam. It is a thing.

The heat insulating box constructed in this way can be provided with a large vacuum heat insulating material disposed on the side wall or bottom wall of the box or inside the open / close door, and filled with polyurethane foam and filled and fixed. Therefore, compared with a heat insulation box using a plurality of small vacuum heat insulating materials, there is little influence of void generation and heat bridge, and the effect of improving heat insulation performance and workability can be obtained.
JP 2006-194559 A

  However, in the above-described conventional configuration, a laminated body of the open-cell hard plastic 5 foam and the inorganic material 6 is used as the core material, and this laminated body ensures the strength of the vacuum heat insulating material T. Since the inside of the vacuum heat insulating material T is in a vacuum state, an external force obtained from the product of the atmospheric pressure and the surface area of the vacuum heat insulating material T is loaded on the surface of the vacuum heat insulating material T in the atmosphere.

  Further, when the vacuum heat insulating material T is used by being embedded in the polyurethane resin U, pressure by the polyurethane resin U is applied. As described above, since the static heat is constantly applied to the vacuum heat insulating material T, the core material is required to have enough strength to withstand it.

  The inorganic material 6 is made of inorganic powder or glass fiber, and is solidified to facilitate handling and improve productivity. However, since the former needs to suppress scattering when handled before solidification, The latter is easier to handle. However, the latter has poor ductility, and due to the influence of minute surface defects, it is likely to break due to a large load or a long-term static load, and the vacuum heat insulating material T is deformed and the density of the core material increases. There is a problem that the performance is reduced. Moreover, in order to ensure intensity | strength, enlarging a fiber diameter leads to the expansion of the heat-transfer path | route inside the vacuum heat insulating material T, and there exists a subject that performance deteriorates.

  The present invention provides a composite heat insulating material using a vacuum heat insulating material that increases the strength of the core material, and is less deformed even in a situation where a static external force is applied to the vacuum heat insulating material over a long period of time and can maintain performance. Objective.

  In order to achieve the above object, the present invention includes a vacuum heat insulating material that is sealed under reduced pressure by inserting a core material, which is a glass fiber laminate, into a covering material made of a gas barrier film, and is embedded in the foamed resin heat insulating material. A composite heat insulating material is constituted, and the glass fiber obtained by fiberizing glass having a longitudinal elastic modulus of 75 to 85 GPa is used.

  Thereby, a vacuum heat insulating material embed | buried in a foamed resin heat insulating material can suppress a deformation | transformation with a high intensity | strength core material with respect to being compressed with the static external force added from a foamed resin heat insulating material. From this, it can also suppress that the heat insulation performance of a vacuum heat insulating material falls. By embedding a vacuum heat insulating material having high strength against such an external force in the foamed resin heat insulating material and manufacturing a composite heat insulating material, it becomes possible to maintain performance for a long period of time.

  According to the present invention, the strength of the core material is increased by forming the core material of the vacuum heat insulating material with glass having a high longitudinal elastic modulus as compared with the conventional example (Patent Document 1). By creating a vacuum heat insulating material using this high-strength core material, even if it receives static external force due to atmospheric pressure or foamed resin over a long period of time, it will maintain its performance without deformation. Even with a composite heat insulating material in which a vacuum heat insulating material is embedded in the material, performance deterioration can be suppressed.

  The invention of the composite heat insulating material according to claim 1 of the present invention is a foamed resin heat insulating material in which a vacuum heat insulating material which is sealed under reduced pressure by inserting a core material which is a glass fiber laminate into an outer covering material made of a gas barrier film is used. The glass fiber is obtained by fiberizing glass having a longitudinal elastic modulus of 75 GPa or more, and the vacuum heat insulating material embedded in the foamed resin heat insulating material is foamed. In contrast to being compressed by a static external force applied from a resin heat insulating material, deformation can be suppressed by a high-strength core material. From this, it can also suppress that the heat insulation performance of a vacuum heat insulating material falls. By embedding a vacuum heat insulating material having high strength against such an external force in the foamed resin heat insulating material and manufacturing a composite heat insulating material, it becomes possible to maintain performance for a long period of time.

  The invention of the composite heat insulating material according to claim 2 embeds a vacuum heat insulating material in which a core material, which is a glass fiber laminate, is inserted into a jacket material made of a gas barrier film and sealed under reduced pressure, inside the foamed resin heat insulating material. The glass fiber is obtained by fiberizing glass having a longitudinal elastic modulus of 75 to 85 GPa, and the vacuum heat insulating material embedded in the foamed resin heat insulating material is a foamed resin heat insulating material. In contrast to being compressed by a static external force applied from the material, deformation can be suppressed by the core material having higher strength. From this, it can also suppress that the heat insulation performance of a vacuum heat insulating material falls. By embedding a vacuum heat insulating material having high strength against such an external force in the foamed resin heat insulating material to produce a composite heat insulating material, it is possible to maintain performance for a longer period of time.

  The invention of the composite heat insulating material according to claim 3 is characterized in that, in the invention according to claim 1 or 2, the diameter of the glass fiber constituting the core material is 1 to 10 μm, and the core Since the gap of the glass fiber in the material is minute and the moving distance of the residual gas is shortened, heat conduction by the gas can be suppressed. Furthermore, since the contact area at the contact point between the fibers can be reduced, the thermal resistance can be increased, and the heat conduction by the solid can also be suppressed. From this, high performance can be maintained for a long time by embedding such a vacuum heat insulating material in a foamed resin heat insulating material to produce a composite heat insulating material.

  The invention of the composite heat insulating material according to claim 4 is characterized in that, in the invention according to claim 1 or 2, the glass fiber constituting the core material has a diameter of 3 to 5 μm. Since the gap of the glass fiber in the inside is minute and the moving distance of the residual gas is shortened, heat conduction by the gas can be suppressed. Furthermore, since the contact area at the contact point between the fibers can be reduced, the thermal resistance can be increased, and the heat conduction by the solid can also be suppressed. From this, high performance can be maintained for a long time by embedding such a vacuum heat insulating material in a foamed resin heat insulating material to produce a composite heat insulating material.

  In the invention of the composite heat insulating material according to claim 5, the vacuum heat insulating material according to any one of claims 1 to 4 is in a thickness direction of the foamed resin heat insulating material in the foamed resin heat insulating material. It is characterized by being arranged unevenly, and the thickness from the surface of the foamed resin heat insulating material to the vacuum heat insulating material is deflected. When using composite heat insulating material on other objects or by sandwiching them, it is possible to prevent the vacuum insulation material from being broken by arranging the small thickness side in contact with the side with few irregularities and protrusions. It becomes a vacuum heat insulating material that can maintain high performance for a long time. From this, high performance can be maintained for a long time by embedding such a vacuum heat insulating material in a foamed resin heat insulating material to produce a composite heat insulating material.

  The invention of the composite heat insulating material according to claim 6 is characterized in that in the invention according to any one of claims 1 to 5, two or more vacuum heat insulating materials are embedded in one foamed resin heat insulating material. Even if protrusions penetrate the foamed resin insulation and break the vacuum insulation jacket, only a part of the performance degradation of the composite insulation occurs, and the overall performance degradation is avoided. It becomes a vacuum heat insulating material that can maintain high performance for a long time. From this, high performance can be maintained for a long time by embedding such a vacuum heat insulating material in a foamed resin heat insulating material to produce a composite heat insulating material.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Further, the present invention is not limited to the embodiments.

(Embodiment 1)
FIG. 1 is a cross-sectional view of a composite heat insulating material in Embodiment 1 of the present invention. FIG. 2 is a partially cutaway perspective view of the composite heat insulating material in the same embodiment.

  As shown in FIG. 1, the composite heat insulating material 101 is configured by embedding a vacuum heat insulating material 102 inside a foamed resin heat insulating material 103. The vacuum heat insulating material 102 and the foamed resin heat insulating material 103 are both plate-shaped, and the center line 104a of the vacuum heat insulating material 102 and the center line 104b of the foamed resin heat insulating material 103 in the thickness direction are substantially parallel, but they coincide with each other. There is no bias.

  The foamed resin heat insulating material 103 is a polyurethane foam, a polystyrene foam, a phenol foam or the like obtained by foaming and curing polyurethane, polystyrene, phenol or the like. These have excellent heat insulating properties and are widely used as building materials and industrial materials.

The vacuum heat insulating material 102 has a configuration in which a core material 105 and a moisture adsorbent 106, which are glass fiber laminates, are inserted into a bag-shaped outer covering material 107, and the inside is decompressed. At this time, the density of the core material 105 is adjusted from 200 to 300 kg / m ³ so that the vacuum heat insulating material 102 has a thickness of 10 mm.

  The vacuum heat insulating material 102 is produced by drying the core material 105 in a drying furnace at 140 ° C. for 20 minutes, and then sealing the three sides of the laminate film having gas barrier properties by heat welding and inserting it into a cover material 107 formed into a bag shape. Then, the pressure is reduced so that the inside of the jacket material 107 becomes 10 Pa or less in the reduced pressure chamber, and the opening is hermetically sealed by heat welding.

  The jacket material 107 is made of a plastic laminate film in which a polyethylene terephthalate film is used for the outermost layer, an alumina foil is used for the intermediate layer, and a linear low density polyethylene film is used for the heat welding layer.

  As the moisture adsorbent 106, calcium oxide is applied.

  The glass fiber used for the core material 105 is glass wool having an average fiber diameter of 1 to 10 μm, preferably about 3.5 μm. In addition, although the general-purpose soda-lime glass composition is used, fiber strength is improved by blowing cooling air immediately after fiberization and quenching.

  The core material 105 is produced by laminating glass wool made of a glass fiber web until a predetermined thickness is reached, and forming a laminate in which the webs are joined by entanglement. Then, the board-shaped core material is shape | molded by thermoforming the laminated body of glass fiber with 450 degreeC lower than the strain point of glass for 5 minutes with a heat press.

  In addition to the above method, a board-like core material having higher rigidity can be formed by applying a binder during hot pressing. These can be determined in consideration of the required quality and productivity of the vacuum heat insulating material 102.

  The vacuum heat insulating material 102 produced in this way receives a static load of about 0.1 MPa at atmospheric pressure in the atmosphere. Further, when the composite heat insulating material 101 is manufactured, when the composite heat insulating material 103 is embedded in the foamed resin heat insulating material 103, pressure accompanying foaming of the foamed resin heat insulating material 103 is applied.

  For example, since the pressure due to urethane foaming is approximately 0.01 MPa, the pressure applied statically to the surface of the vacuum heat insulating material 102 is approximately 0.11 MPa.

  The strength of the vacuum heat insulating material 102 against such a static load depends on the strength of the core material 105, and it is effective to improve the strength of the glass fibers constituting the core material 105. As one of the means, the longitudinal elastic modulus of the glass is increased to 75 GPa or more, preferably 75 to 85 GPa.

  From the above, long-term performance can be maintained by embedding the vacuum heat insulating material 102 having high strength against static external force in the foamed resin heat insulating material 103 to manufacture the composite heat insulating material 101.

  Further, as shown in FIG. 2, the composite heat insulating material 101 is configured by embedding two or more vacuum heat insulating materials 102 in a foamed resin heat insulating material 103. From this, even if a protrusion penetrates the foamed resin heat insulating material 103 and one of the vacuum heat insulating materials 102 breaks the bag and the performance deteriorates, avoid the extreme deterioration of the performance of the composite heat insulating material 101 as a whole. Can do.

  Hereinafter, the composite heat insulating material of the present invention, the vacuum heat insulating material constituting the composite heat insulating material, and the glass fiber used therefor will be specifically described using examples and comparative examples, but the present invention is only the present example. It is not limited to.

(Example 1)
In Example 1, a glass fiber laminate having a glass longitudinal elastic modulus of 75 GPa and a fiber diameter of 3 to 5 μm and calcium oxide as a moisture adsorbent were inserted into a bag-like laminate film having a gas barrier property and reduced in pressure. It was a sealed vacuum heat insulating material, and its thickness was 10.0 mm. Furthermore, the thermal conductivity of the composite heat insulating material in which this vacuum heat insulating material was embedded in urethane, which is a foamed resin heat insulating material, and had a thickness of 40 mm was 0.0062 W / mK.

(Example 2)
In Example 2, a glass fiber laminate having a glass longitudinal elastic modulus of 80 GPa and a fiber diameter of 3 to 5 μm and calcium oxide as a moisture adsorbent were inserted into a bag-like laminate film having a gas barrier property and decompressed. The sealed vacuum heat insulating material had a thickness of 10.5 mm. Furthermore, the thermal conductivity of the composite heat insulating material in which this vacuum heat insulating material was embedded in urethane which is a foamed resin heat insulating material and had a thickness of 40 mm was 0.0052 W / mK.

(Example 3)
In Example 3, a glass fiber laminate with a glass longitudinal elastic modulus of 85 GPa and a fiber diameter of 3 to 5 μm and calcium oxide as a moisture adsorbent were inserted into a bag-like laminate film having a gas barrier property and decompressed. The sealed vacuum heat insulating material had a thickness of 11.0 mm. Furthermore, the thermal conductivity of the composite heat insulating material having this vacuum heat insulating material embedded in urethane, which is a foamed resin heat insulating material, and having a thickness of 40 mm was 0.0048 W / mK.

Example 4
In Example 4, a glass fiber laminate having a glass longitudinal elastic modulus of 75 GPa and a fiber diameter of 1 to 10 μm and calcium oxide as a moisture adsorbent were inserted into a bag-like laminate film having a gas barrier property and decompressed. It was a sealed vacuum heat insulating material, and its thickness was 10.0 mm. Furthermore, the thermal conductivity of the composite heat insulating material in which this vacuum heat insulating material was embedded in urethane as a foamed resin heat insulating material and had a thickness of 40 mm was 0.0065 W / mK.

(Example 5)
In Example 5, a glass fiber laminate having a glass longitudinal elastic modulus of 80 GPa and a fiber diameter of 1 to 10 μm and calcium oxide as a moisture adsorbent were inserted into a bag-like laminate film having gas barrier properties and reduced in pressure. The sealed vacuum heat insulating material had a thickness of 10.5 mm. Furthermore, the thermal conductivity of the composite heat insulating material in which this vacuum heat insulating material was embedded in urethane as a foamed resin heat insulating material and had a thickness of 40 mm was 0.0055 W / mK.

(Example 6)
In Example 6, a glass fiber laminate having a glass longitudinal elastic modulus of 85 GPa and a fiber diameter of 1 to 10 μm and calcium oxide as a moisture adsorbent were inserted into a bag-like laminate film having a gas barrier property and decompressed. The sealed vacuum heat insulating material had a thickness of 11.0 mm. Furthermore, the thermal conductivity of the composite heat insulating material in which this vacuum heat insulating material was embedded in urethane as a foamed resin heat insulating material and had a thickness of 40 mm was 0.0049 W / mK.

(Comparative Example 1)
In Comparative Example 1, a glass fiber laminate having a glass longitudinal elastic modulus of 72 GPa and a fiber diameter of 1 to 10 μm, and calcium oxide as a moisture adsorbent were inserted into a bag-like laminate film having gas barrier properties and decompressed. The thickness of the sealed vacuum heat insulating material was 9.5 mm. Furthermore, the thermal conductivity of the composite heat insulating material in which this vacuum heat insulating material was embedded in urethane as a foamed resin heat insulating material and had a thickness of 40 mm was 0.0073 W / mK.

(Comparative Example 2)
In Comparative Example 2, a glass fiber laminate having a glass longitudinal elastic modulus of 72 GPa and a fiber diameter of 3 to 5 μm and calcium oxide as a moisture adsorbent were inserted into a bag-like laminate film having a gas barrier property and reduced in pressure. The thickness of the sealed vacuum heat insulating material was 9.5 mm. Furthermore, the thermal conductivity of the composite heat insulating material in which this vacuum heat insulating material was embedded in urethane as a foamed resin heat insulating material and had a thickness of 40 mm was 0.0070 W / mK.

(Comparative Example 3)
In Comparative Example 3, a glass fiber laminate having a glass longitudinal elastic modulus of 72 GPa and a fiber diameter of 10 to 14 μm and calcium oxide as a moisture adsorbent were inserted into a bag-like laminate film having a gas barrier property and decompressed. The thickness of the sealed vacuum heat insulating material was 9.5 mm. Furthermore, the thermal conductivity of the composite heat insulating material in which this vacuum heat insulating material was embedded in urethane as a foamed resin heat insulating material and had a thickness of 40 mm was 0.0075 W / mK.

(Comparative Example 4)
In Comparative Example 1, a glass fiber laminate with a glass longitudinal elastic modulus of 90 GPa and a fiber diameter of 3 to 5 μm and calcium oxide as a moisture adsorbent were inserted into a bag-like laminate film having gas barrier properties, and the pressure was reduced. When sealed, the jacket material broke and the vacuum insulation could not be manufactured.

  In addition, the result of the Example and the comparative example was put together in (Table 1).

  As described above, when the longitudinal elastic modulus of the glass is set to 75 to 85 GPa, a thickness of 10 mm or more of the designed value can be secured in an atmosphere subjected to a static load such as atmospheric pressure, and the thermal conductivity of the composite heat insulating material. Can be reduced and the heat insulation performance can be improved. Furthermore, if it is 90 GPa, the force with which the glass fiber pierces the jacket material becomes excessive, and it becomes difficult to manufacture the vacuum heat insulating material. On the other hand, when the glass fiber diameter is thicker than 1 to 10 μm, the thermal conductivity of the composite heat insulating material increases and the performance deteriorates. On the other hand, if it is 3-5 micrometers, the heat conductivity of a composite heat insulating material can be reduced and a performance can be improved.

  In the composite heat insulating material according to the present invention, it is possible to embed a vacuum heat insulating material in a widely spread foamed resin heat insulating material, and to greatly improve the heat insulating capacity with an equivalent thickness. For this reason, it can utilize for the various heat insulation, cold insulation apparatus, a house, etc. which the foamed resin heat insulating material is used conventionally, and can reduce the energy for temperature control.

Sectional drawing of the composite heat insulating material in Embodiment 1 of this invention The partially cutaway perspective view of the composite heat insulating material in Embodiment 1 of the present invention Plan sectional view showing internal structure of side wall of heat insulation box applied to conventional container

Explanation of symbols

101 Composite insulation material 102 Vacuum insulation material 103 Foamed resin insulation material 105 Core material (glass fiber)
107 Jacket material

Claims (6)

  A vacuum heat insulating material, in which a core material that is a glass fiber laminate is inserted into a jacket material made of a gas barrier film and sealed under reduced pressure, is embedded in a foamed resin heat insulating material, and the glass fiber has a longitudinal elastic modulus. A composite heat insulating material obtained by fiberizing glass of 75 GPa or more.   A vacuum heat insulating material, in which a core material that is a glass fiber laminate is inserted into a jacket material made of a gas barrier film and sealed under reduced pressure, is embedded in a foamed resin heat insulating material, and the glass fiber has a longitudinal elastic modulus. A composite heat insulating material obtained by fiberizing glass of 75 to 85 GPa.   The diameter of the glass fiber which comprises a core material is 1-10 micrometers, The composite heat insulating material of Claim 1 or 2 characterized by the above-mentioned.   3. The composite heat insulating material according to claim 1, wherein the glass fiber constituting the core material has a diameter of 3 to 5 μm.   The composite heat insulating material according to any one of claims 1 to 4, wherein the vacuum heat insulating material is disposed in the foamed resin heat insulating material so as to be biased with respect to a thickness direction of the foamed resin heat insulating material.   Two or more vacuum heat insulating materials are embed | buried in one foamed resin heat insulation, The composite heat insulating material as described in any one of Claim 1 to 5 characterized by the above-mentioned.

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