JP4671895B2 - Insulation panel, insulation box and method for producing insulation panel - Google Patents

Description

  The present invention relates to a heat insulating panel used for a heat insulating material such as a refrigerator, and an apparatus using the same.

  In recent years, from the viewpoint of global warming, the necessity of reducing the power consumption of home appliances is desired. Among them, refrigerators, air conditioners, and the like are products that consume particularly large amounts of power, and it is necessary to reduce power consumption as a measure against global warming. Taking a refrigerator as an example, if the load in the refrigerator is constant, the power consumption of the refrigerator depends on the efficiency of the compressor for cooling in the refrigerator and the heat insulation performance of the heat insulating material related to the amount of heat leakage from the refrigerator. Since the majority of these are determined, in the technical development of the refrigerator, the performance of the heat insulating material is required to be improved together with the efficiency of the compressor.

  One of the heat insulating materials for solving such problems is a vacuum heat insulating material. A vacuum heat insulating material is produced by putting a substance having a fiber shape excellent in heat insulating properties into an outer packaging material having gas barrier properties and making the inside a high vacuum.

  Until now, vacuum heat insulating materials have been used only for flat surfaces, but in recent years, vacuum heat insulating materials that can be applied to curved surfaces (R-shaped) and have excellent heat insulating properties have been demanded. Bendable vacuum insulation has been proposed.

Japanese Patent Application Laid-Open No. 2002-310384 (Patent Document 1) is a vacuum heat insulating material comprising a core material in which a reinforcing material is laminated on at least one surface of an inorganic fiber aggregate and an outer packaging material having gas barrier properties. A molded body of inorganic fiber and inorganic powder and an inorganic fiber sheet that do not include a binder for solidifying the fiber material by the fiber assembly are described. Japanese Patent Application Laid-Open No. 2004-197954 (Patent Document 2) has a gas barrier outer packaging material having a heat-welded layer and a plate-shaped core material, and is in close contact with the core material without including a core material therebetween. A vacuum heat insulating material having a peripheral portion formed only of an outer packaging material, particularly including a plurality of core materials is described. In Japanese Patent Application Laid-Open No. 2004-251460 (Patent Document 3), the core material is formed only of inorganic fibers that are not bound by the core material of SiO ₂ as a main component and acting as a binding material on the outer skin material having gas barrier properties. A vacuum heat insulating material, in which a plurality of inorganic fibers formed only by molding into a sheet is laminated.

JP 2002-310384 A JP 2004-197954 A JP 2004-251460 A

  The vacuum heat insulating material described in Patent Document 1 can improve surface properties and rigidity by inserting a reinforcing material (powder or sheet) on at least one surface and inserting a core material between the reinforcing materials. When bent, the gas barrier film may be damaged or the thermal conductivity may be reduced. In particular, when the curved surface of the vacuum insulation material is tight, the vacuum insulation is peeled off due to the force of the attached vacuum insulation, or there is a gap between the vacuum insulation and the attached part. Immediately before the material is applied, there arises a problem that the shape of the vacuum heat insulating material must be processed. Further, the shape may return to its original shape even if it is bent as time passes. Furthermore, it is necessary to give a thickness by superimposing aggregates of ultrafine inorganic fibers having a high fiber distribution peak of 1 μm or less and 0.1 μm or more. Therefore, there are problems of low productivity and high cost.

  Although the vacuum heat insulating material described in Patent Document 2 has good shape bendability and shape retainability, the heat welded portion between the core material and the core material is a portion composed only of an outer packaging material that does not include the core material. Therefore, it is difficult to reduce the thermal conductivity of the portion.

  Although the vacuum heat insulating material described in Patent Document 3 can reduce the thermal conductivity, it uses a plurality of core materials and is difficult to arrange along a curved surface with a small radius. Moreover, it is difficult to hold the bent shape, and the shape may return to its original shape as time passes.

  Accordingly, an object of the present invention is to provide a heat insulating material that can be easily attached to a curved surface shape and can maintain heat conductivity.

Feature of the present invention for solving the above problems includes a core material having a gas barrier enveloping member for enclosing the core material, there the inside of the outer material in insulation panels sealed by vacuum Te, the insulating panel is provided with a aggregate on the outer material within, which have a corrugated portion to at least a portion of the aggregate, to have a concavo-convex shape from the aggregate to the outer material of the insulating panel It is.

  The aggregate may be corrugated like the entire surface, but may be a flat plate partially corrugated. Further, a plurality of aggregates may be provided on one heat insulating panel.

  According to the present invention, it is possible to provide a heat insulating panel capable of maintaining heat insulating characteristics even when bent and used. As a result, it is possible to provide a device having excellent heat insulating properties even when the surface on which the heat insulating panel is pasted is a curved surface shape or a combination of a curved surface and a flat surface.

  Details of the present invention will be described below.

  A feature of the present invention that solves the above problems is that in a heat insulating panel having inorganic fibers and an outer packaging material, and the outer packaging material is sealed under reduced pressure, corrugated aggregates are arranged on the surface layer of the inorganic fibers or inside the inorganic fibers. It is to have done. As a result, even when the corrugated aggregate portion is bent into a curved shape as a whole, it is possible to enhance the gas barrier property without concentrating stress on a part of the outer packaging material. Moreover, the margin part of an outer packaging material can be formed by producing uneven | corrugated shape in the surface part. As a result, it is possible to prevent tearing of the outer packaging material when the heat insulating panel is deformed and used, and to maintain the heat insulating characteristics for a long time.

  The above-mentioned heat insulation panel is a heat insulation panel having an uneven shape in which inorganic fibers and corrugated aggregates are put in an outer packaging material, sealed under reduced pressure, and the corrugated plate shape is reflected on the surface portion. . As a result, it is easy to bend the heat-insulating panel with these uneven portions, and the stress relating to the outer packaging material can be reduced, so that tearing and thinning can be prevented and the degree of vacuum can be maintained.

  The shape of a heat insulation panel is not specifically limited, The thing of various shapes and thickness can be provided according to the applied location and workability | operativity.

  The corrugated aggregate may have a pleated shape on a line or a rectangular shape in addition to a repetitive shape of a curve, or a bellows shape. Depending on the device using the heat insulating material, the corrugated aggregate may be changed to an aggregate composed of a combination of corrugated and flat shapes, large and small corrugated shapes, and the like. In addition, three-dimensional molding may be performed after sealing under reduced pressure. Further, it is preferable to put a getter agent in the outer packaging material and seal it under reduced pressure to improve heat insulation.

  The corrugated aggregate is preferably made of a material having plastic deformability. As the aggregate, any one or a combination of aluminum, iron, copper, and SUS can be used, and an aggregate mainly composed of an organic resin and having plastic deformability can be used. However, organic resins and the like that generate gas from the aggregate itself are not preferable because the degree of vacuum is reduced.

  As for the corrugated shape of the corrugated aggregate, it is desirable that the corrugated sheet has a thickness of 0.1 to 0.2 mm and an angle between sides constituting the corrugated sheet is 90 to 120 °. If the angle is smaller, the force applied to the outer packaging material during decompression sealing may be larger and the gas barrier property may be reduced. If the angle is larger, the corrugated aggregate is easily deformed by external pressure, and the outer packaging material This is because the gas barrier property may be lowered.

  As the inorganic fiber material, various kinds of fibers containing no binder such as glass wool, glass fiber, alumina, silica alumina, silica, rock wool and silicon carbide can be used. However, thermal conductivity characteristics and costs vary depending on the average fiber diameter.

  Fibers having an average fiber diameter of 5 μm or more are inexpensive although they have somewhat poor thermal conductivity, and are easy to put into practical use in terms of cost. When the fiber diameter is large, it is considered that the fibers are arranged in the same direction and the contact of the fibers is close to a line.

  Inorganic fibers having an average fiber diameter of 3 to 5 μm are preferable because the heat flow path is zigzag in addition to the contact resistance, the heat resistance is increased and the thermal conductivity is lowered, and the cost is also appropriate.

  Fibers having an average fiber diameter of less than 2 μm are preferable because of low thermal conductivity. When used for vacuum insulation, it is necessary to overlap the fiber assembly to obtain a thickness. However, productivity is low and expensive.

  In particular, glass wool not containing a binder having an average fiber diameter of 3 to 5 μm is preferably used from the viewpoint of characteristics and cost.

  For the purpose of dehydration and degassing of the core material, it is also effective to subject the core material or the like to aging treatment before inserting the gas barrier film. The heat treatment temperature at this time is preferably 110 ° C. or higher, and more preferably 180 ° C. or higher, since the minimum dehydration is possible.

  The outer packaging material covers the core material in order to provide an airtight part inside, and the material structure is not particularly limited. However, the material can reflect the shape of the aggregate when sealed under reduced pressure. It is necessary to. If the outer packaging material has rigidity, it is difficult to bend, which causes tearing or the like at the time of bending.

  As the outer packaging material, a laminate film having a bag shape is often used. It is desirable to have an outermost layer that can cope with impacts, an intermediate layer that ensures gas barrier properties, and an innermost layer that can be sealed by thermal fusion. In addition, puncture resistance may be improved by applying a polyamide resin or the like to the outermost layer, or two layers of an ethylene-vinyl alcohol copolymer resin having an aluminum vapor deposition layer may be provided as an intermediate layer. Examples of the innermost layer include high-density polyethylene resin, polypropylene resin, polyacrylonitrile resin, and the like, and high-density polyethylene resin is preferable from the viewpoint of sealing properties and chemical attack properties.

  For example, specific configurations include polyethylene terephthalate resin for the outermost layer, aluminum foil for the intermediate layer, plastic laminate film made of high-density polyethylene resin for the innermost layer, polyethylene terephthalate resin for the outermost layer, and aluminum vapor deposition for the intermediate layer. It is a plastic laminate film made of an ethylene-vinyl alcohol copolymer resin having a layer and a high-density polyethylene resin in the innermost layer. Improve gas barrier properties, for example, a two-layer structure of polyamide for the outermost layer, polyethylene terephthalate resin for the second layer, aluminum foil for the intermediate layer, and an aluminum laminate film made of high-density polyethylene resin for the innermost layer be able to.

  In order to further improve the reliability of the vacuum heat insulating material, a getter agent can be used. The getter agent only needs to absorb gas such as carbon dioxide, oxygen, nitrogen, and water vapor. Use gettering agent such as dosonite, hydrotalcite, metal hydroxide, etc. or moisture adsorbent such as molecular sieves, silica gel, calcium oxide, zeolite, activated carbon, potassium hydroxide, sodium hydroxide, lithium hydroxide as required. it can.

  Said heat insulation panel can be used for a heat insulation box or a heat insulation board.

  The heat insulation box is a space made up of an outer box and an inner box, and the space is filled with a hard resin foam, and the above heat insulation panel is inserted into the space filled with the hard resin foam. it can. As a method of inserting the heat insulation panel and the hard resin foam, a method of arranging the heat insulation panel in a space formed in advance by the inner box and the outer box and then injecting the hard resin foam into an integral molding, or the heat insulation panel There are various methods such as preparing a heat insulating board integrally molded with a hard resin foam in advance and attaching the heat insulating board to the inner box or the outer box, or sandwiching them between the two. The heat insulating plate is a plate-shaped article composed of a heat insulating panel and a hard resin foam, and is appropriately used for an article that requires heat insulating performance.

  The above insulation panel can be applied to each product that needs to be kept warm. Examples include refrigerators, air conditioners, water heaters, microwave ovens, building materials, railway vehicles, automobiles, medical inspection equipment, high-temperature devices, and the like. This is especially effective for products that include heat exchange parts and require heat insulation.

  By applying the heat insulating panel of the present invention to the refrigerator, the heat insulation / cooling function can be improved, and a reduction in heat leakage and energy saving can be expected. The refrigerator includes a vending machine, a product display shelf, a product display case, a cool box, a cooler box, and the like, in addition to a refrigerator and freezer for home use and commercial use.

  Moreover, by applying it to a railway vehicle, it is possible to provide a sufficient heat insulation effect while securing a vehicle interior space and to solve problems such as condensation.

By using it in a water heater, a decrease in hot water temperature is suppressed, and an energy saving effect can be expected.
〔Example〕
Hereinafter, the structure and production of a heat insulating panel of the present invention and a refrigerator in which the heat insulating panel is inserted will be described with reference to the drawings.

  FIG. 1A shows a schematic cross-sectional view of the heat insulation panel 1 of the present invention. It is a heat insulating panel having a configuration in which a corrugated aggregate 4 is sandwiched in an inorganic fiber material 3 that does not contain a binder, and is sealed together with a getter agent 5 under reduced pressure by an outer packaging material 2. When it is deformed, the angle of the peak / valley portion bent as shown in FIG. 1 (b) changes, and the outer packaging material is less distorted. In addition, since there is a margin of the outer packaging material formed at the time of pressure reduction sealing in the concave portion, the influence of deformation can be absorbed.

  On the other hand, the cross-sectional schematic diagram of the conventional heat insulation panel 6 which is a comparative example is shown to Fig.2 (a). It is a heat insulating panel having a configuration in which an inorganic fiber material 3 that does not contain a binder is sealed together with a getter agent 5 under reduced pressure by an outer packaging material 2. FIG.2 (b) is a schematic diagram at the time of deform | transforming the conventional heat insulation panel. It is difficult to deform, and at the same time, the deformation causes deformation of the shape, and in particular, the outer portion of the outer packaging material has no margin and affects the outer packaging material.

FIG. 3 shows a schematic cross-sectional view of the corrugated aggregate used in the present invention. Let L be the length of the sides forming the corrugated plate
This corrugated aggregate is (mm), the angle between sides is θ (°), and the thickness of the plate is d (mm). The wavy portion has a degree of freedom and can deform the heat insulating material. It can be curved like the lower stage after making the suspended planar shape, or it can be made the lower stage shape using aggregates curved from the beginning.

  The perspective schematic diagram of the heat insulation box 8 which inserted this invention heat insulation panel 1 in Fig.4 (a) is shown. A heat insulating panel 1 in which a heat insulating panel 1 in which an aggregate having a wavy shape is inserted is inserted into an inner surface side of a box 9 formed by press forming an iron plate, and a hard polyurethane foam 7 is foam-filled in a gap portion. is there. When the heat insulation panel is manufactured, an aggregate obtained by combining corrugated aggregates and flat aggregates is used, and a part formed by three-dimensionally bending a part as shown in (b) is used.

  The heat insulation panel of the present invention was produced by changing the aggregate shape and the like, and the shape bending property, shape retention property, thermal conductivity, and thermal deterioration of the thermal conductivity were confirmed. The results are shown in Table 1.

以下、実施例及び比較例を詳細に説明する。

Hereinafter, examples and comparative examples will be described in detail.

  The heat insulation panel 11 of Example 1 was produced as follows.

  A corrugated aggregate (aggregate shape: L = 5 mm, θ = 90 °, plate thickness = 0.1 mm) is sandwiched between glass wool having an average fiber diameter of 3 μm (size: 200 mm × 200 mm × 10 mm), After aging treatment at 180 ° C. for 1 hour using a thermostatic layer, it is placed in an outer packaging material 2 made of a gas barrier film, and further filled with a getter agent 4 (molecular sieves 13X / activated carbon) that adsorbs gas. After exhausting until the internal pressure of the heat insulation panel became 1.3 Pa for 10 minutes with the rotary pump of the packaging machine and 10 minutes with the diffusion pump, the ends were sealed with heat seal.

  The heat conductivity of the heat insulating panel 11 (thickness: about 10 mm) obtained in this way was measured at 10 ° C. using AUTO-Λ manufactured by Eihiro Seiki Co., Ltd. The initial thermal conductivity was 2.0 mW / m · K.

The shape bendability can be determined by using a bending tester with the maximum bending load (N) under the test conditions (speed: 10 mm / min, distance between fulcrums: 100 mm (support and indenter are round bars of Φ20 mm), displacement: 40 mm). ) Was measured and evaluated. As a result, the shape bendability was 70.9N.

  As for shape retention, the bent state was observed after 4 hours. The shape was not changed from the shape before holding, and the shape holding property was good.

  The manufactured heat insulation panel was folded and placed in a thermostatic bath, and a heat insulation durability test was performed. After leaving at 70 ° C. for 30 days, the thermal conductivity was measured. As a result, it was 3.0 mW / m · K.

  On the other hand, as Comparative Example 1, a heat insulating panel similar to that of Example 1 was produced without using the above-mentioned aggregate. As a result, the shape bendability was difficult to bend at 124N. Moreover, the shape after bending was not hold | maintained and shape retention property was unsatisfactory. The initial thermal conductivity was 2.0 mW / m · K. The heat insulation after the durability test was 7.8 mW / m · K.

  When corrugated aggregate is not used, the outer packaging material becomes thin or micro cracks occur due to the stress at the time of bending, and the gas barrier property is lowered, and the degree of vacuum in the heat insulation panel It is thought that the deterioration of the thermal conductivity over time is caused by the decrease of.

  As described above, the heat-insulating panel containing the aggregate has a heat-insulating effect at the bent portion, and the deterioration of the thermal conductivity is suppressed. When making insulation panels, the outer packaging material reflects the shape of the corrugated aggregate, so that excessive stress is not applied to the outer packaging material even when it is bent, and deterioration of thermal conductivity over time is suppressed. It became clear that. In addition, shape bendability and shape retention were improved. Therefore, it is easy to maintain the bent shape, and an easy-to-handle heat insulation panel can be provided.

  The same heat insulation panel was produced by changing θ in Example 1 to 120 °. As a result, the initial thermal conductivity was 2.2 mW / m · K, and the shape bendability was 82.9N. The shape retention was good. The thermal conductivity after the same durability test as in Example 1 was 3.2 mW / m · K, and the deterioration with time was suppressed.

  The same experiment was performed by changing the size of L of the aggregate of Example 1 to 10 mm. As a result, the initial thermal conductivity was 2.1 mW / m · K, the shape bendability was 46.3 N, and the shape retention was good. The thermal conductivity after the same durability test as in Example 1 was 3.2 mW / m · K, and the deterioration with time was suppressed.

  The aggregate of Example 1 was changed to L = 10 mm and θ = 120 °, and a similar heat insulation panel was produced. As a result, the initial thermal conductivity was 2.1 mW / m · K, the shape bendability was 61.1 N, and the shape retention was good. The thermal conductivity after the durability test similar to that in Example 1 was 3.2 mW / m · K, and the deterioration with time was suppressed.

  The aggregate shape of Example 1 was changed to L = 20 mm, and a similar heat insulation panel was produced. As a result, the initial thermal conductivity was 2.2 mW / m · K, the shape bendability was 74.5 N, and the shape retention was good. The thermal conductivity after the durability test as in Example 1 was 2.9 mW / m · K, and the deterioration with time was suppressed.

  The aggregate shape of Example 1 was changed to L = 20 mm and θ = 120 °, and a similar heat insulation panel was produced. As a result, the initial thermal conductivity was 2.2 mW / m · K, the shape bendability was 95.4 N, and the shape retention was good. The thermal conductivity after the durability test as in Example 1 was 3.1 mW / m · K, and the deterioration with time was suppressed.

  The aggregate shape of Example 1 was changed to plate thickness = 0.2 mm, and a similar heat insulating panel was produced. As a result, the initial thermal conductivity was 2.2 mW / m · K, the shape bendability was 113.6 N, and the shape retention was good. The thermal conductivity after the durability test similar to that of Example 1 was 3.0 mW / m · K, and the deterioration with time was suppressed.

The aggregate shape of Example 1 was changed to θ = 120 ° and the plate thickness = 0.2 mm, and a similar heat insulation panel was produced. As a result, the initial thermal conductivity was 2.2 mW / m · K, the shape bendability was 106.9 N, and the shape retention was good. The thermal conductivity after the durability test similar to that of Example 1 was 3.2 mW / m · K, and the deterioration with time was suppressed.

  The aggregate shape of Example 1 was changed to L = 10 mm and the plate thickness = 0.2 mm, and a similar heat insulation panel was produced. As a result, the initial thermal conductivity was 2.1 mW / m · K, the shape bendability was 81.6 N, and the shape retention was good. The thermal conductivity after the durability test similar to that of Example 1 was .2 mW / m · K, and the deterioration with time was suppressed.

  The aggregate shape of Example 1 was changed to L = 10 mm, θ = 120 °, and plate thickness = 0.2 mm, and a similar heat insulating panel was produced. As a result, the initial thermal conductivity was 2.1 mW / m · K, the shape bendability was 89.3 N, and the shape retention was good. The thermal conductivity after the durability test similar to that of Example 1 was 3.0 mW / m · K, and the deterioration with time was suppressed.

  The aggregate shape of Example 1 was changed to L = 20 mm and the plate thickness = 0.2 mm, and a similar heat insulation panel was produced. As a result, the initial thermal conductivity was 2.2 mW / m · K, the shape bendability was 74.5 N, and the shape retention was good. The thermal conductivity after the durability test as in Example 1 was 3.1 mW / m · K, and the deterioration with time was suppressed.

  The aggregate shape of Example 1 was changed to L = 20 mm, θ = 120 °, and plate thickness = 0.2 mm to produce a similar heat insulating panel. As a result, the initial thermal conductivity was 2.3 mW / m · K, the shape bendability was 116 N, and the shape retention was good. The thermal conductivity after the durability test as in Example 1 was 3.1 mW / m · K, and the deterioration with time was suppressed.

  The glass wool of the heat insulation panel of Example 3 was changed to glass wool having an average fiber diameter of 5.5 μm to produce a similar heat insulation panel. As a result, the initial thermal conductivity was 4.2 mW / m · K, the shape bendability was 84.5 N, and the shape retention was good. The thermal conductivity after the same durability test as in Example 1 was 5.3 mW / m · K.

  From this, when glass wool having a large average fiber diameter is used, the initial thermal conductivity becomes a large value along with the characteristic fluctuation of the glass wool, but the shape can be maintained.

  The aggregate shape of the heat insulation panel of Example 3 was changed to a plate thickness = 0.3 mm, and a similar heat insulation panel was produced. As a result, the initial thermal conductivity was 2.2 mW / m · K, the shape bendability was 139.8 N, and the shape retention was good. The thermal conductivity after the durability test similar to that in Example 1 was 3.0 mW / m · K, and the deterioration with time was suppressed.

  Therefore, when the aggregate thickness is 0.3 (mm), the maximum load during bending is larger than when no corrugated aggregate is used, but bending workability is reduced. The shape retention is good.

  The aggregate shape of the heat insulation panel of Example 3 was changed to θ = 130 °, and a similar heat insulation panel was produced. As a result, the initial thermal conductivity was 3.3 mW / m · K, the shape bendability was 97.6 N, and the shape retention was good. The thermal conductivity after the durability test similar to that in Example 1 was 9.0 mW / m · K.

  Therefore, when the angle forming the side of the corrugated aggregate is 130 °, the corrugated aggregate is deformed and flattened by external pressure after sealing under reduced pressure. Even if it reflects the shape of corrugated aggregate, excessive stress is applied to the outer packaging material when bending is performed, the gas barrier property of the outer packaging material decreases, and the degree of vacuum in the heat insulation panel decreases. It has been clarified that the thermal conductivity causes deterioration over time.

The aggregate shape of the heat insulation panel of Example 3 was changed to the plate thickness = 0.05 mm, and a similar heat insulation panel was produced. As a result, the initial thermal conductivity was 2.4 mW / m · K, the shape bendability was 108 N, and the shape retention was good. The thermal conductivity after the durability test as in Example 1 was 9.2 mW / m · K.

  For this reason, when the thickness of the corrugated aggregate is 0.05 (mm), the corrugated aggregate is deformed and flattened by external pressure after sealing under reduced pressure. Even if the outer packaging material reflects the shape of the corrugated aggregate, excessive stress is applied to the outer packaging material when bending is performed, the gas barrier property of the outer packaging material decreases, and the degree of vacuum in the heat insulation panel decreases. As a result, it was revealed that the thermal conductivity was deteriorated with time.

  The aggregate shape of the heat insulation panel of Example 3 was changed to θ = 80 °, and a similar heat insulation panel was produced. As a result, the initial thermal conductivity was 2.3 mW / m · K, the shape bendability was 71.8 N, and the shape retention was good. The thermal conductivity after the durability test as in Example 1 was 8.9 mW / m · K.

  Therefore, when the angle forming the side of the corrugated aggregate is set to 80 °, the angle forming the side of the aggregate is small, so excessive stress is applied to the outer packaging material at the time of decompression sealing, and the outer packaging material It has been clarified that the gas barrier property is lowered and the degree of vacuum in the heat insulating panel is lowered, thereby causing deterioration of the thermal conductivity with time.

  The example which uses the heat insulation panel 1 of this invention for the box or door part of a refrigerator is shown.

  The refrigerator is insulated by a heat insulating panel and other heat insulating materials. The temperature difference between the refrigerator and the outside air temperature is particularly large between the compressor peripheral part and the outer surface side of the inner box 10 on the back of the refrigerator. It is effective to use the heat insulation panel of the present invention at this site.

  The heat insulation panel used was a corrugated aggregate alone or a combination of corrugated aggregate and flat aggregate, and a conventional flat panel.

  The box 9 was filled with polyol and isocyanate using a high-pressure foaming machine to produce a heat insulating material for the refrigerator. Rigid polyurethane foam 7 of foam insulation is 40 parts by weight of polyether polyol obtained by adding propylene oxide to m-tolylenediamine having an average hydroxyl value of 450 as an polyol, and o-tolylenediamine having an average hydroxyl value of 470. 30 parts by weight of polyether polyol added with propylene oxide, 30 parts by weight of polyether polyol added with propylene oxide to o-tolylenediamine having an average hydroxyl value of 380, 100 parts by weight of mixed polyol component, 15 parts by weight of cyclopentane 1.5 parts of water and 1.2 parts by weight of tetramethylhexamethylenediamine as a reaction catalyst and 2 parts of trimethylaminoethylpiperazine as a reaction catalyst, 2 parts by weight of an organic silicone compound X-20-1614 as a foam stabilizer, and a millionate as an isocyanate component MR 125 parts of diphenylmethane isocyanate polynuclear body was used for foam filling.

The amount of heat leakage and power consumption of the refrigerator after the heat insulation was measured. The amount of heat leakage of the refrigerator was measured as the amount of heat leakage from the interior by setting the temperature condition opposite to the operation state of the refrigerator. Specifically, a refrigerator is installed in a temperature-controlled room at −10 ° C., and the temperature conditions for comparing the power consumption and the cooling performance of the refrigerator by energizing the heaters so that the inside temperature becomes a predetermined measurement condition (temperature difference). Measured with The power consumption of the refrigerator was measured according to the JIS C9801 measurement standard. As a result, it was possible to provide a refrigerator capable of reducing heat leakage by 12% and power consumption by 25% compared to a refrigerator without the insulation panel 1 inserted.

  In addition, said polyurethane foam can be used for a heat insulation box or a heat insulation board including a refrigerator etc. with the heat insulating material of this invention.

  Here, examples of the hard resin foam include hard urethane foam, phenol foam, and styrene foam. Among these, a rigid polyurethane foam using cyclopentane and water as a mixed foaming agent is preferable.

The rigid polyurethane foam is obtained by reacting an isocyanate with a polyol as a basic raw material in the presence of a foaming agent, a foam stabilizer, and a reaction catalyst. As the polyol, from m-tolylenediamine (2,4-tolylenediamine, 2,6-tolylenediamine) and o-tolylenediamine (2,3-tolylenediamine, 3,4-tolylenediamine) The propylene oxide adduct of the initiator was mainly used. Other initiators are dihydric alcohol propylene glycol, dipropylene glycol, trihydric alcohol glycerin, trimethylolpropane, polyhydric alcohol diglycerin, methyl glucoside, sorbitol, sucrose, alkylene polyamine ethylenediamine, diethylenetriamine, alkanol. Polyols in which amines such as monoethanolamine, diethanolamine, isopropanolamine and other diaminodiphenylmethane, bisphenol A, and polymethylene polyphenylpolyamine were added with various alkylene oxides were used. Diisocyanate diisocyanate polynuclear is mainly used as the isocyanate. Since the isocyanate using the diphenylmethane diisocyanate polynuclear body has a small difference in viscosity from the polyether polyol solution, the compatibility with the polyether polyol is improved. By using diphenylmethane diisocyanate polynuclear bodies, the initial reaction is relatively fast and the gelation and curing are slowed down, so that the amount of foam expansion at the time of demolding is reduced. Tolylene diisocyanate isomer mixture, 100 parts of 2,4-form, 2,4-form / 2,6-form = 80/20, 65/35 (weight ratio) as well as trade name Mitsui Cosmonate TRC, Takeda's Takenate 4040 prepolymer urethane-modified tolylene diisocyanate, allophanate-modified tolylene diisocyanate, biuret-modified tolylene diisocyanate, isocyanurate-modified tolylene diisocyanate and the like can also be used. As the 4,4'-diphenylmethane diisocyanate, the product name Mitsui Cosmonate M-200 containing a polynuclear compound of 3 or more nuclei in addition to a pure product as a main component, diphenylmethane isocyanate polynuclear product of Millionate MR manufactured by Takeda Pharmaceutical is used. it can. Further, as the foaming agent, hydrocarbon-based foaming agent cyclopentane and water are used. 12 to 18 parts by weight of cyclopentane and less than 1.8 parts by weight of water are combined per 100 parts by weight of the polyol mixture. In general, if a large amount of cyclopentane and water is used, the density can be easily reduced. However, if there is a large amount of water, the partial pressure of carbon dioxide in the bubble cell increases and the amount of swelling increases. Inferiority. As a reaction catalyst, tetramethylhexamethylenediamine, pentamethyldiethylenetriamine, and a trimerization catalyst can be used in combination to increase the high-speed reaction and cure properties. The blending amount of the reaction catalyst is preferably 2 to 5 parts by weight with respect to 100 parts by weight of the polyol component. Other than that, tertiary amines such as trimethylaminoethylpiperazine, triethylenediamine, tetramethylethylenediamine, trimerization catalyst tris (3-dimethylaminopropyl) hexahydro-S-triazine, slow-acting catalyst dipropylene glycol, and potassium chloride acetate It can be used if the reactivity matches. As the foam stabilizer, the foam is uniformly expanded and has a uniform strength because the size of the bubble cell is aligned with the lower surface tension. The blending amount of the foam stabilizer is 1.5 to 4 parts by weight per 100 parts by weight of the polyol component. For example, B-8461, B- from Goldschmidt
8462, X-20-1614, X-20-1634, manufactured by Shin-Etsu Chemical Co., Ltd., SZ-1127, SZ-1671, manufactured by Nippon Unica, are used. A rigid polyurethane foam is foamed using the above materials. For example, a PU-30 type foaming machine manufactured by Promart Co., Ltd. is used as the foaming machine. Foaming conditions vary somewhat depending on the type of foaming machine, but usually the liquid temperature is 18-30 ° C. and the discharge pressure is 80-150.
The preferred conditions are kg / cm ² , discharge rate of 15-30 kg / min, and mold box temperature of 35-45 ° C.

  A present Example is an example which uses the heat insulation panel 1 of this invention as a heat insulating material of a double skin structure material rail vehicle. In a railway vehicle having a double skin structure, in order to reduce weight and improve pressure resistance, the side and the roof structure have a curved surface structure, and the conventional heat insulating panel 6 is difficult to attach. Moreover, when it sticks, a distortion will arise in an outer packaging material, an internal vacuum degree will fall, and the deterioration of a heat insulation characteristic will pose a problem as a result.

  In the present example, the heat insulating panel used was a corrugated aggregate alone or a combination of corrugated aggregate and flat aggregate. When the heat insulation panel 1 of the present invention is used, it can be attached along the curved surface of the structure. The heat insulation effect of the vehicle body was sufficient, and problems such as condensation in the vehicle did not occur. Since the degree of vacuum is unlikely to decrease, the heat insulating properties are excellent, and the heat insulating material thickness can be reduced to 1/2 to 1/3. As a result, the vehicle interior space can be made wider.

  Moreover, since the heat insulation panel itself has a shape-retaining property, the attachment property to the vehicle is good. As above-mentioned, the heat insulation panel of this invention is effective as a heat insulating material for rail vehicles.

  The present embodiment is an example in which a water heater is manufactured using the heat insulating panel 1 of the present invention as a heat insulating material for a hot water storage tank. The hot water storage tank has a cylindrical shape or a shape having a curved portion, and the conventional heat insulating panel 6 is difficult to be attached. Moreover, when a conventional heat insulation panel is forcibly applied, the outer packaging material is distorted, and the heat insulation characteristics are lowered as the internal vacuum is lowered.

  When the heat insulation panel 1 of the present invention is used, the heat insulation panel 1 can be attached along the curved surface of the hot water storage tank.

  Hot water (90 ° C.) was put into the produced hot water storage tank, and the change in the hot water temperature was measured. As a result, the hot water temperature after 75 hours was 75 ° C. As a comparative example, a hot water storage tank without a heat insulating material was prepared, hot water was similarly added, and the change in the hot water temperature was measured. As a result, the hot water temperature after 2 hours was 55 ° C. From this, by using the heat insulating material 1 of the present invention for the hot water storage tank for a water heater, compared to the case where no heat insulating material is used, a decrease in hot water temperature can be greatly suppressed, and the amount of heat necessary for heat insulation is required. This is very effective from the viewpoint of energy saving.

  ADVANTAGE OF THE INVENTION According to this invention, the heat insulation panel which can make shape bendability, shape maintenance property, and heat insulation characteristic compatible is obtained. In particular, when the surface to which the heat insulation panel is attached is a curved surface shape, a combination of a curved surface and a flat surface, or a three-dimensional shape, a heat insulating panel that can be molded and arranged in accordance with the device is obtained. Furthermore, the apparatus provided with the heat insulation panel of this invention can be obtained. Further, by inserting the heat-insulating panel of the present invention into a refrigerator box and a door and foaming and filling a rigid polyurethane foam composed of cyclopentane and a water-mixed foaming agent, the refrigerator can reduce heat leakage and power consumption. Is obtained. Furthermore, it is effective as a heat insulating material for railway vehicles and water heaters.

It is a cross-sectional schematic diagram of the heat insulation panel of this invention. It is a cross-sectional schematic diagram of the conventional heat insulation panel. It is a cross-sectional schematic diagram of the corrugated aggregate of this invention. It is a cross-sectional schematic diagram of a part of the heat insulation box of the heat insulation panel insertion details of the present invention. It is a perspective schematic diagram of the refrigerator heat insulation box which inserted the heat insulation panel of this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Heat insulation panel of this invention, 2 ... Outer packaging material, 3 ... Inorganic fiber material, 4 ... Corrugated aggregate, 5 ... Getter agent, 6 ... Conventional heat insulation panel, 7 ... Hard polyurethane foam, 8 ... Heat insulation box , 9 ... box body, 10 ... box in the refrigerator.

Claims (12)

A heat insulating panel having a core material and a gas barrier outer packaging material that encloses the core material, wherein the inside of the outer packaging material is decompressed and sealed;
The insulation panels, the aggregate formed in the outer material inside, characterized in that have a wavy portion on at least a portion of the bone material to have the uneven shape from the aggregate to the outer material of the insulating panel Insulation panel. The heat insulation panel according to claim 1,
The said aggregate is the heat insulation panel characterized by the angle which the side which comprises a wavelike part makes is 90-120 degrees. The heat insulation panel according to claim 1,
The heat insulation panel, wherein the aggregate has an aggregate thickness of 0.1 to 0.2 mm. The heat insulation panel according to claim 1,
The said aggregate has a planar shape part and a corrugated sheet-like part, The heat insulation panel characterized by the above-mentioned. The heat insulation panel according to claim 1,
The said aggregate is arrange | positioned between the said some core materials, or is arrange | positioned in the surface layer of the said core material, The heat insulation panel characterized by the above-mentioned. The heat insulation panel according to claim 1,
The heat insulation panel characterized in that the aggregate has plastic deformability. The heat insulation panel according to claim 1,
The heat insulating panel, wherein the core material is an inorganic fiber. The heat insulation panel according to claim 7,
The heat insulation panel characterized by the said inorganic fiber being glass wool with an average fiber diameter of 3-5 micrometers, and a binder not being included. The heat insulation panel according to claim 1,
A heat insulating panel comprising a getter agent in the outer packaging material. The heat insulation panel according to claim 1,
The heat insulation panel, wherein the heat insulation panel is three-dimensionally molded. An insulating box having an outer box member and an inner box member, and a space formed by the outer box and the inner box is filled with a hard resin, and a heat insulating panel is inserted in the space, The panel includes a core material, an aggregate having a wavy portion at least in part, and a gas barrier outer packaging material that encloses the core material and the aggregate and seals the interior by decompressing the outer packaging material. A heat insulating box having an uneven shape derived from the aggregate. Laminate an inorganic fiber aggregate having a sheet shape and an aggregate having a wavy part at least in part, and store in an outer packaging material having a gas barrier property, and the outer packaging material is decompressed and sealed. The manufacturing method of the heat insulation panel characterized by forming the uneven | corrugated shape derived from the said aggregate.

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