JP2005273696A - Vacuum heat insulating material, heat-retaining and cold-keeping apparatus equipped with vacuum insulating material, and heat insulating board - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a high performance vacuum heat insulating material applying glass fiber shaped body not using bonding agent in a core material to reduce heat conduction of core material solid composition in the core material for vacuum heat insulation for reducing heat conductivity of the vacuum heat insulating material and improving deterioration of heat insulating performance with time. <P>SOLUTION: This vacuum heat insulating material 1 consists of a board shape core material 2 and outer wrapping material 3 of plastic laminate film covering the core material 2 and an inside thereof is decompressed and sealed. The board shaped core material 2 consists of laminated body of glass short fiber webs and webs are combined by physical interengagement, the board shaped core material 2 is plastically deformed in a density range of 100-400 kg/m<SP>3</SP>. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a vacuum heat insulating material, a heat and cold insulation device to which the vacuum heat insulating material is applied, and further to a heat insulating board.

  In recent years, energy saving has been desired for the purpose of preventing global warming, and energy saving has been promoted for consumer devices. In particular, with respect to a refrigerator-freezer, a heat insulating material having excellent heat insulating properties is required from the viewpoint of efficiently using cold heat.

  As a general heat insulating material, a fiber body such as glass wool or a foam body such as urethane foam is used. However, it is necessary to increase the thickness of the heat insulating material in order to improve the heat insulating properties of these heat insulating materials. Therefore, when there is a limit to the space where the heat insulating material can be installed, or when space saving or effective use of the space is necessary, the conventional heat insulating material is not desirable.

  As a means for solving such a problem, there are a core material made of a porous body and a vacuum heat insulating material configured by covering the core material with an outer packaging material and sealing the inside under reduced pressure. In recent years, vacuum heat insulating materials that are further superior in heat insulating performance have been demanded in the face of intensifying competition for energy saving in recent years.

  In general, heat transfer of a heat insulating material is caused by heat conduction, radiation, and convective heat transfer between a solid and a gas component. On the other hand, the vacuum heat insulating material formed by reducing the pressure inside the outer packaging material has little effect on the heat conduction and convective heat transfer of the gas component.

  In addition, there is almost no contribution of radiation when used in a temperature range below room temperature. Therefore, it is important to suppress the heat conduction of the solid component in the vacuum heat insulating material applied to a cold insulation device used at room temperature or lower. Thus, various fiber materials have been reported as a core material for vacuum heat insulation excellent in heat insulation performance.

  For example, a vacuum heat insulating material has been proposed in which a compressed fiber mat in which an inorganic binder material having thermoplastic properties such as a low-melting glass composition or boric acid is dispersed throughout the fiber material is used as a core material.

  As shown in FIG. 7, two adjacent glass fibers 71 and glass fibers 72 are made of an inorganic binder material, and a bonding portion 74 is formed at an intersection 73 to form the fiber material into a compressed fiber mat. (For example, refer to Patent Document 1).

  With this configuration, individual fibers can be integrated, and since no volatile compound is generated from the binder, the internal pressure of the vacuum heat insulating material is not increased. .

  On the other hand, an inorganic aqueous fiber having an average fiber diameter of 2 μm or less, preferably 1 μm or less, is subjected to an acidic aqueous solution treatment and compression dehydration treatment, and the elution components of the inorganic fibers are collected at the intersections of the inorganic fibers to act as a binder and are integrated with the inorganic fibers. There has been proposed a vacuum heat insulating material using a material having a property as a core (see, for example, Patent Document 2).

  As an effect of this configuration, since it does not include a binding material that binds fibers together, there are few gas components generated from the binding material under vacuum conditions in the jacket material, and the deterioration of the heat insulation performance over time is small, It has been reported that heat insulation performance is excellent.

  Furthermore, a vacuum heat insulating material using glass fibers having an average fiber diameter of 1 μm as a core material has been proposed (see, for example, Patent Document 3).

In this configuration, since a moisture adsorbing substance is additionally contained in the vacuum heat insulating material, it is reported that deterioration of thermal conductivity is suppressed and initial heat insulating performance can be maintained for a long time.
Japanese National Patent Publication No. 11-506708 JP 7-167376 A JP 59-225275 A

  However, in the above conventional configuration, since the binder bound at the intersection of the inorganic fibers and the elution component from the inorganic fibers act as a binder, the solidified binder and the elution component are heated at the binding site between the fibers. By acting as a bridge, heat conduction increases. At this time, there was a problem that the thermal conductivity of the vacuum heat insulating material was increased as compared with a core material made of a fibrous body having no binding site due to a binder or an elution component.

  On the other hand, when a fiber body having a conventional configuration without binding sites due to binders and elution components is applied as it is as a core material, although the heat conduction of the solid component is small, the state is bulky cotton-like and is very easy to handle. Have difficulty. Moreover, when using it as a core material of a vacuum heat insulating material, there existed problems, such as an external appearance surface property being impaired by atmospheric compression. In particular, when glass fibers having an average fiber diameter of more than 3 μm were applied, the appearance defect was more prominent.

  The present invention solves the above-mentioned conventional problems, and not only does it not deteriorate the heat insulation performance due to the increase in internal pressure due to the gas component generated from the binder, but also the binding site formed at the intersection of the fibers as a thermal bridge By suppressing the heat conduction which acts, the high performance vacuum heat insulating material which has the heat insulation performance 10 times or more of the conventional rigid urethane foam is provided.

  In addition, the present invention provides a board-like fiber molded article having a low cost and excellent surface properties.

  Furthermore, the present invention provides a heat and cold insulation device that can contribute to energy saving by including a high-performance vacuum heat insulating material having an excellent heat insulating performance 10 times or more that of a conventional rigid urethane foam.

In order to solve the above-described conventional problems, the vacuum heat insulating material of the present invention is a vacuum heat insulating material that includes a board-shaped core material and an outer packaging material of a plastic laminate film that covers the core material, and the inside is sealed under reduced pressure. The board-like core material is made of a laminate of short glass fiber webs, the webs are bonded by physical entanglement, and the board-like core material is plastically deformed at a density in the range of 100 to 400 kg / m ^3. It is what.

  Therefore, due to the physical effect of the anchor effective action due to the entanglement of the glass fibers and the shape change due to the thermal deformation of the glass fibers, the aggregate made of the glass fibers retains a predetermined board shape with reduced elasticity before molding. .

  Therefore, the core material made of an aggregate of glass fibers can hold the core material in a predetermined board shape even if there is no binding material between the fibers.

  In the vacuum heat insulating material of the present invention, the core material is formed between the glass fibers as the core material without using a binder due to a binder component or an elution component from the fiber. Therefore, there is no binder due to the binder component or the eluted component from the fiber at the intersection between the fibers.

  As a result, since there is no binding site that has conventionally acted as a thermal bridge, the heat transfer point between the fibers is greatly reduced, and the amount of heat transfer is suppressed. From the above results, the heat insulating performance of the vacuum heat insulating material of the present invention is greatly improved.

  Moreover, since the binder component is not used, the gas generated from the binder component does not become a problem, and a vacuum heat insulating material with little deterioration in heat insulation performance with time can be provided.

  In addition, since no binder component is used during the molding of the core material, it is possible to reduce the man-hours in the core material molding process, enabling efficient production, and the surface of the board-shaped core material is similar to the surface texture of the press mold. Therefore, a board-like core material having excellent surface properties can be formed.

The invention according to claim 1 is a vacuum heat insulating material comprising a board-like core material and an outer packaging material of a plastic laminate film covering the core material, wherein the board-like core material is made of glass. It is a vacuum heat insulating material made of a laminate of short fiber webs, wherein the webs are bonded by physical entanglement, and the density of the board-like core material is in the range of 100 to 400 kg / m ³ .

  Therefore, since the web of short glass fibers is a laminated body that is uniformly laminated in the thickness direction, the glass fibers constituting the board-shaped core material after molding are arranged in a direction perpendicular to the thickness direction, and the heat between the fibers Resistance increases.

  Moreover, between the webs of short glass fibers, a part of the glass fibers are entangled with each other, thereby exhibiting restraint and integrity in the thickness direction.

  As a result of the above action, the aggregate made of glass fibers retains a predetermined board shape due to a decrease in elasticity before molding due to an anchor effective physical action due to the entanglement of the glass fibers.

  As a result, the core material made of an aggregate of glass fibers can maintain the core material in a predetermined board shape without the binding material between the fibers, and the handling property of the core material is improved, so Workability such as insertion process is improved.

The invention described in claim 2 is a vacuum heat insulating material comprising a board-shaped core material and an outer packaging material of a plastic laminate film covering the core material, wherein the board-shaped core material is made of glass. It consists of a laminate of short fiber webs, the webs are bonded by physical entanglement, and the board-like core material is a vacuum heat insulating material that is plastically deformed at a density in the range of 100 to 400 kg / m ³ .

  Therefore, due to the physical action of the anchor effect due to the entanglement of the glass fibers and the shape change due to the thermal deformation of the glass fibers, the aggregate made of the glass fibers decreases in elasticity before molding and maintains a predetermined board shape.

  Therefore, the core material made of an aggregate of glass fibers can hold the core material in a predetermined board shape even if there is no binding material between the fibers.

  Moreover, since the effect of extending the fiber can be expected due to thermal deformation of the glass fiber at the time of hot pressing, it is considered that the heat insulation performance is improved by further improving the laminated arrangement of the glass fibers.

  With the above action, the heat insulating performance of the vacuum heat insulating material of the present invention is greatly improved.

  The invention according to claim 3 is a vacuum heat insulating material in which the board-like core material according to claim 1 or 2 is formed with a smooth surface layer on at least one outermost surface in the laminating direction of the web laminate.

  Therefore, in addition to the operation according to claim 1 or 2, when the board-shaped core material is packaged with a plastic laminate film and the inside thereof is a vacuum heat insulating material sealed under reduced pressure, at least in the heat transfer direction of the vacuum heat insulating material. One film surface has no unevenness and has good smoothness.

  As a result, when the vacuum heat insulating material is applied to a heat and cold insulation device or the like, its stickability is improved, and problems such as poor appearance are not caused on the appearance of the heat and cold insulation device.

  Invention of Claim 4 is a vacuum heat insulating material in which the glass short fiber as described in any one of Claim 1 to 3 consists of alkali-containing glass.

  Therefore, in addition to the effect | action as described in any one of Claims 1-3, in the case of thermally changing the compression molding body of glass fiber, the shaping | molding process at a lower temperature is attained.

  The invention according to claim 5 is a vacuum heat insulating material in which the board-shaped core material according to any one of claims 1 to 4 does not contain a binder component.

  Therefore, in addition to the fact that the board-shaped core member can maintain the predetermined shape by the action according to any one of claims 1 to 4, it does not include a binder that binds the glass fibers.

  As a result, since there is no binding site between fibers that has conventionally acted as a thermal bridge, the heat transfer point is reduced and the amount of heat transfer is reduced.

  With the above action, the heat insulating performance of the vacuum heat insulating material of the present invention is further improved.

  A heat insulation and cold insulation apparatus according to a sixth aspect of the invention comprises the vacuum heat insulating material according to any one of the first to fifth aspects.

  Therefore, in order to have the heat insulation performance 10 times or more of the conventional rigid urethane foam, high heat insulation is achieved and it can contribute to energy saving. Moreover, since the surface property of a vacuum heat insulating material is favorable, a thing with favorable attachment property and the box body surface smoothness of a thermal insulation apparatus can be produced.

  Further, since the increase in internal pressure due to the gas component generated from the binder does not cause deterioration of the heat insulation performance, the deterioration of the heat insulation performance over time is small, and it is possible to continuously contribute to energy saving.

  A heat insulating board according to a seventh aspect of the present invention comprises the board-shaped core material of the vacuum heat insulating material according to any one of the first to fifth aspects.

  Therefore, since the heat insulation board is a glass fiber molded body and does not contain an organic binder, it can be used up to about 400 ° C., which is the heat resistant temperature of glass fiber, and has high heat resistance with excellent heat resistance. Can be used as an insulation board.

  Furthermore, since the inorganic binder is not included, the flexibility of the board is high.

  In addition, since the structure is a laminated body of glass fibers, there is an advantage that problems such as generation of off-flavors and generation of gas components at the time of high temperature use do not occur because there is little powder falling off and no binder is included.

  The short glass fibers that can be used in the present invention are not particularly limited, but glass-forming oxides that can be in a glass state are desirable, and furthermore, those that have a low heat distortion temperature and are uniformly laminated in the thickness direction. As a general-purpose industrial product, glass wool is more desirable from the viewpoint of low cost and handleability.

  The fiber diameter is not particularly specified, but it is already known that a finer fiber diameter can provide better heat insulation performance. However, in the conventional core material having the binding site at the intersection of the inorganic fibers, the heat insulation performance obtained only with fine fibers having an average fiber diameter of 2 μm or less can be obtained in this configuration even with glass fibers having an average fiber diameter of 3 μm or more. Since it is feasible, excellent heat insulation performance can be realized at low cost even when a general-purpose glass wool product is used.

  In addition, a plastic laminate film can be used as the outer packaging material of the present invention, but a metal foil or a vapor deposition layer can be applied in order to impart higher gas barrier properties. In addition, a metal foil and a vapor deposition layer can use a well-known thing, and it does not specify it in particular.

  Various gas adsorbents can be applied to the vacuum heat insulating material of the present invention. Examples include physical adsorbents such as synthetic zeolite, activated carbon, activated alumina, silica gel, dawsonite, hydrotalcite, chemical adsorbents such as alkali metals and alkaline earth metals alone and their oxides and hydroxides, or air components. There are getter agents that can adsorb.

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

(Embodiment 1)
FIG. 1 is a schematic cross-sectional view of a vacuum heat insulating material in Embodiment 1 of the present invention.

  Moreover, FIG. 2 shows the flowchart of the core material formation process of the core material 2 in Embodiment 1 of this invention. Furthermore, in FIG. 3, the microscope picture of the core material of the vacuum heat insulating material in Embodiment 1 of this invention is shown.

  In FIG. 1, the vacuum heat insulating material 1 is configured by inserting a core material 2 and an adsorbent 4 into an outer packaging material 3 and depressurizing the inside.

  The vacuum heat insulating material 1 is produced by drying the core material 2 in a drying furnace at 140 ° C. for 30 minutes, and then inserting the three sides of the laminate film into the outer packaging material 3 formed into a bag shape by heat welding. Thus, the pressure is reduced so that the inside of the outer packaging material becomes 10 Pa or less, and the opening is hermetically sealed by heat welding.

  At this time, the outer packaging material 3 is constituted by a plastic laminate film comprising a polyethylene terephthalate film (12 μm) as an outermost layer, an aluminum foil (6 μm) as an intermediate layer, and a linear low density polyethylene film (50 μm) as a heat welding layer. ing.

  Moreover, calcium oxide is applied to the adsorbent as a moisture adsorbent.

  On the other hand, the core material 2 is a laminated body of glass fibers in which webs made of short glass fibers are bonded by physical entanglement, and is obtained by laminating glass wool having an average fiber diameter of 3.5 μm to a predetermined density. The glass fiber is molded by hot pressing at 480 ° C. for 5 minutes, where the product temperature is thermally deformed.

  At this time, C glass having an alkali content of 17% by weight is applied as the short glass fiber as the alkali-containing glass. Moreover, as a result of analyzing the viscosity temperature characteristic of this glass by the beam bending method, the temperature of the strain point was 525 degreeC.

  In addition, FIG. 2 is a flowchart of the core material forming step, which is composed of three steps: (a) forming a glass fiber laminate, (b) heating press, and (c) cooling.

Furthermore, if it demonstrates in detail along a process, (a) The formation process of a glass fiber laminated body will laminate | stack the glass short fiber web on the thickness direction, and will shape | mold a laminated body. At this time, since the fibers are intertwined in a part of the glass fiber laminate, integrity is imparted to the glass fiber aggregate due to the anchor effect.
(B) A heating press process heat-deforms glass fiber by pressing while heating glass fiber, and the laminated body of glass fiber heat-deforms to the shape at the time of hot press.

  Thereafter, in the (c) cooling step, the aggregate of glass fibers thermally deformed in the pressed state is cooled. At this time, the aggregate of glass fibers is deformed in the shape at the time of pressing, and a board-like core material that retains the shape at the time of hot pressing can be formed.

  Therefore, the core material made of an aggregate of glass fibers can hold the core material in a predetermined shape even if there is no binding material between the fibers.

  FIG. 3 is a photomicrograph of the surface of the core material produced by the above method, and it can be seen that there is no binder between the fibers.

  The temperature at which the glass fiber can be thermally deformed is a temperature at which the glass fiber can be deformed by a load from the up and down direction at the time of pressing, and the viscosity is lowered to such an extent that the cross-sectional shape of the glass fiber does not change significantly. Temperature. Thus, when it heats until the cross-sectional shape of glass fiber changes, since the bridge | crosslinking part called a neck is formed between glass fibers, and heat insulation performance falls, it is not desirable.

  The thermal conductivity of the vacuum heat insulating material 1 formed by the above method was measured with an auto lambda manufactured by Hidehiro Seiki. As a result, the thermal conductivity was 0.002 W / mK at an average temperature of 24 ° C., and the thermal conductivity was 10 times or more that of a general-purpose hard urethane foam.

In addition, when the density of the core material is less than 100 kg / m ³ , there is a problem that sufficient rigidity cannot be obtained in the core material, handling properties are lowered, and the surface of the formed vacuum heat insulating material is uneven. . On the other hand, when the density of the core material exceeds 400 kg / m ³ , there is a problem that the thermal conductivity of the vacuum heat insulating material increases.

  Thus, the vacuum heat insulating material produced by this structure has the outstanding heat insulation performance. This means that there is no binder due to the binder component or the eluted component from the fiber at the intersection between the fibers.

  Therefore, conventionally, since there is no binding site that has acted as a thermal bridge, the heat transfer point between the fibers is reduced, so the amount of heat transfer in the thickness direction of the core material is reduced, and the heat insulation performance is improved. .

  Furthermore, since the effect of fiber stretching can also be expected due to thermal deformation of the glass fiber aggregate during hot pressing, it is considered that the heat insulation performance is improved by further improving the laminated arrangement of glass fibers. It is done.

  In addition, since a binder component is not used, a gas generated from the binder component does not become a problem, and a vacuum heat insulating material with little deterioration in heat insulation performance with time can be provided.

  Further, since it is not necessary to use a binder component at the time of molding the core material, man-hours can be reduced and efficient core material molding becomes possible.

(Embodiment 2)
FIG. 4 is a perspective view of the vacuum heat insulating material in Embodiment 2 of the present invention.

  Hereinafter, the vacuum heat insulating material of Embodiment 2 of this invention is demonstrated. Although the vacuum heat insulating material 1 is shape | molded by the method similar to Embodiment 1, in the core material 2, the smooth surface layer was formed in the outermost surface in the lamination direction of the laminated body of the short glass fiber web. It is a vacuum insulation material.

  The core material forming step of the core material 2 is the same as that of the second embodiment of the present invention, but the surface roughness Ra25 μm of the press surface of the press used when pressing the glass fiber while heating in the hot press step. Finished with the following (cutoff value 2.5 mm).

  Therefore, by heating and compressing the glass fiber with a press surface having such a smooth surface, the surface of the laminated body of glass fibers is a board-like core material having substantially the same flatness as the press machine surface. Can be molded.

  The smooth surface layer means that, when the core material size is 100 × 100 mm, the flatness is 2 mm or less except for local irregularities on the core material surface, and the presence or absence of irregularities is judged visually. It is not easy and the surface state is a non-woven fabric.

  As a result, by applying the board-like core material having such a smooth surface layer as the core material of the vacuum heat insulating material, the surface 31 of the vacuum heat insulating material 1 in FIG. 4 becomes smooth, and the vacuum heat insulating material is kept warm and cool. In the case of application to the above, the sticking property is improved and the problem of appearance defects such as deformation and distortion occurring on the outer surface of the heat insulation device is not caused.

(Embodiment 3)
FIG. 5 is a cross-sectional view of the refrigerator-freezer according to Embodiment 3 of the present invention, and is shown as an example of a heat and cold insulation device.

  FIG. 5 shows a refrigerator 41, which includes a heat insulating box 42 forming a casing of the refrigerator and a refrigeration cycle. The heat insulation box 42 includes an outer box 43 formed by press-molding an iron plate and an inner box 44 formed by molding ABS resin or the like via a flange (not shown). Inside the heat insulating box 42, the vacuum heat insulating material 1 is disposed in advance, and the space other than the vacuum heat insulating material 1 is foam filled with a hard urethane foam 45. The rigid urethane foam 45 uses cyclopentane as a foaming agent.

  The heat insulating box 42 is partitioned by a partition plate 46, and the upper part is a refrigerator compartment 47 and the lower part is a freezer compartment 48. An electric damper 49 is attached to the partition plate 46, and a cooling fan motor 50 and a differential heater 51 are attached to the inner box 44 of the freezer compartment 48.

  On the other hand, in the refrigeration cycle, an evaporator 52, a compressor 53, a condenser 54, and a capillary tube 55 are sequentially connected in an annular shape. Note that the evaporator 52 may be provided at two locations of the refrigerator compartment 47 and the freezer compartment 48 and connected in series or in parallel to form a refrigeration cycle.

  In addition, a door body 56 is attached to the refrigerator 41, the vacuum heat insulating material 1 is disposed inside the door body 56, and a space portion other than the vacuum heat insulating material 1 is foam-filled with a hard urethane foam 45. Yes.

  In addition, the thing of the structure similar to what was shown in Embodiment 1 is used for the vacuum heat insulating material 1. FIG.

  The refrigerator-freezer configured as described above has an excellent heat insulation performance that is 10 times or more that of a conventional rigid urethane foam, so that high heat insulation is achieved and it can contribute to energy saving.

  In addition, since the core material of the vacuum heat insulating material is not bound by the binding material, the heat insulation performance deteriorates over time because the internal pressure due to the gas component generated from the binding material does not cause deterioration of the heat insulating performance. It is possible to continue to contribute to energy conservation.

  In addition, the heat and cold insulation equipment of the present invention is from −30 ° C. which is an operating temperature range of a refrigerator, a freezer, a vegetable cold storage, and a rice cold storage, to a higher temperature such as a vending machine and a hot water supply tank. Refers to equipment that uses heat and cold in the range of.

  Moreover, it is not limited to electrical equipment, but includes gas equipment and the like.

(Embodiment 4)
FIG. 6 is a perspective view of a heat insulating board according to Embodiment 4 of the present invention.

  FIG. 6 shows a heat insulating board 61, and the board-shaped core material of the vacuum heat insulating material shown in the first embodiment is applied as it is as a heat insulating board.

  The heat insulation performance of this heat insulation board was obtained by calculating the thermal conductivity from the heat flux obtained with a heat flow sensor manufactured by Kyoto Electronics Industry Co., Ltd. As a result, it was found that the heat insulation performance was excellent at 0.04 W / mK at an average temperature of 100 ° C. and 0.05 W / mK at 150 ° C.

  In addition, since the heat insulation board of this structure is a molded body of glass fiber and does not include an organic binder, it can be used up to about 400 ° C., which is the heat resistant temperature of glass fiber, and has excellent heat resistance. It can be used as a high performance insulation board.

  In addition, the board has high rigidity and is easy to handle.

  Furthermore, since the structure is a laminated body of glass fibers, it has the advantage that there is little powder falling off, and since it does not contain any binder, it does not cause problems such as generation of off-flavors and gas components when used at high temperatures. ing.

  Hereinafter, the present invention will be described more specifically with reference to Examples and Comparative Examples, but the present invention is not limited only to the Examples.

(Example 1)
As the board-like core material, glass wool having an average fiber diameter of 3.5 μm made of C glass is applied to form an aggregate in which glass wool is laminated so that the core material density is 220 kg / m ^3, and the aggregate is 480 ° C. It shape | molded by carrying out compression molding, applying the temperature of. At this time, a binder serving as a binder is not applied.

  After the core material is dried for 30 minutes in a drying furnace at 140 ° C., the core material is inserted into a pre-packaged outer packaging material made of a plastic laminate film, and the pressure is reduced in the decompression chamber so that the inside of the outer packaging material is 10 Pa or less. The part was hermetically sealed by heat welding to form a vacuum heat insulating material.

  At this time, the outer packaging material is composed of a polyethylene terephthalate film (12 μm) as the outermost layer, an aluminum foil (6 μm) as the intermediate layer, and a linear low density polyethylene film (50 μm) as the heat welding layer.

  As a result, the thermal conductivity of this vacuum heat insulating material was 0.0019 W / mK at an average temperature of 24 ° C.

(Example 2)
As the board-like core material, glass wool having an average fiber diameter of 3.5 μm made of C glass is applied to form an aggregate in which glass wool is laminated so that the core material density is 260 kg / m ^3, and the aggregate is 480 ° C. It shape | molded by carrying out compression molding, applying the temperature of. At this time, a binder serving as a binder is not applied.

  The molding conditions of the vacuum heat insulating material and the structure of the outer packaging material were molded in the same manner as in Example 1.

  As a result, the thermal conductivity of this vacuum heat insulating material was 0.002 W / mK at an average temperature of 24 ° C.

(Example 3)
As the board-like core material, glass wool having an average fiber diameter of 3.5 μm made of A glass is applied to form an aggregate in which glass wool is laminated so that the core material density is 220 kg / m ^3, and the aggregate is 460 ° C. It shape | molded by carrying out compression molding, applying the temperature of. At this time, a binder serving as a binder is not applied.

  The molding conditions of the vacuum heat insulating material and the structure of the outer packaging material were molded in the same manner as in Example 1.

  As a result, the thermal conductivity of this vacuum heat insulating material was 0.002 W / mK at an average temperature of 24 ° C.

  Moreover, since A glass was used, the shaping | molding temperature of the core material was able to be 460 degreeC.

(Comparative Example 1)
The board-like core material is an aqueous solution of sulfuric acid adjusted to pH 3 by applying glass wool made of C glass and having an average fiber diameter of 3.5 μm, forming an aggregate in which glass wool is laminated so that the core material density is 220 kg / m ^3. Was subjected to an adhesion treatment, compression dewatered, and heat-dried to a predetermined shape.

  The molding conditions of the vacuum heat insulating material and the structure of the outer packaging material were molded in the same manner as in Example 1.

  As a result, the thermal conductivity of this vacuum heat insulating material was 0.0027 W / mK at an average temperature of 24 ° C.

(Comparative Example 2)
As the board-like core material, glass wool having an average fiber diameter of 3.5 μm made of C glass is applied to form an aggregate in which glass wool is laminated so that the core material density is 220 kg / m ^3, and water adjusted to a predetermined concentration is used. An aqueous solution of glass was subjected to adhesion treatment, and the aggregate was molded by compression molding while applying a temperature of 480 ° C.

  The molding conditions of the vacuum heat insulating material and the structure of the outer packaging material were molded in the same manner as in Example 1.

  As a result, the thermal conductivity of this vacuum heat insulating material was 0.003 W / mK at an average temperature of 24 ° C.

(Comparative Example 3)
For the board-like core material, glass wool having an average fiber diameter of 3.5 μm made of C glass is applied, an aggregate in which the glass wool is laminated so that the core material density is 220 kg / m ^3, and adjusted to a predetermined concentration. The aqueous acid solution was subjected to adhesion treatment, and the aggregate was molded by compression molding while applying a temperature of 480 ° C.

  The molding conditions of the vacuum heat insulating material and the structure of the outer packaging material were molded in the same manner as in Example 1.

  As a result, the thermal conductivity of this vacuum heat insulating material was 0.0029 W / mK at an average temperature of 24 ° C.

(Comparative Example 4)
As the board-like core material, glass wool having an average fiber diameter of 3.5 μm made of E glass is applied to form an aggregate in which glass wool is laminated so that the material density is 220 kg / m ^3, and the aggregate is formed at 480 ° C. Molded by compression molding while applying temperature.

  The molding conditions of the vacuum heat insulating material and the structure of the outer packaging material were molded in the same manner as in Example 1.

  As a result, the thermal conductivity of this vacuum heat insulating material was 0.002 W / mK at an average temperature of 24 ° C.

  However, since E glass having a high strain point temperature is applied, thermal deformation of the glass fiber is insufficient, and sufficient core material rigidity cannot be obtained, which causes a problem in the handleability of the core material.

Moreover, although the density of the said core material was shape | molded aiming at 220 kg / m < ³ >, the laminated body of glass fiber could not be shape | molded to predetermined thickness, and the density after shaping | molding became 180 kg / m < ³ >.

  The results of Examples 1 to 3 and Comparative Examples 1 to 4 are summarized in (Table 1).

  As described above, the vacuum heat insulating material according to the present invention remarkably reduces the heat conduction of the solid component of the core material, and has an excellent heat insulating performance 10 times or more that of a conventional rigid urethane foam.

  As a result, it is possible to efficiently use hot and cold heat including a refrigerator-freezer and a refrigeration equipment, which can contribute to energy saving of all equipment. Furthermore, the present invention can be applied to all types of heat insulation, heat shielding applications, heat damage countermeasure applications, and the like that should be protected from heat and cold.

  Moreover, the core material of the vacuum heat insulating material of the present invention can also be applied as a high performance heat insulating board excellent in heat resistance.

Sectional schematic diagram of the vacuum heat insulating material in Embodiment 1 of this invention Flowchart of core material forming process in Embodiment 1 of the present invention Micrograph of core material in Embodiment 1 of the present invention The perspective view of the vacuum heat insulating material in Embodiment 2 of this invention Sectional drawing of the refrigerator-freezer in Embodiment 3 of this invention The perspective view of the heat insulation board in Embodiment 4 of this invention Schematic of intersection of inorganic fibers of compressed fiber mat in Patent Document 1

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Vacuum heat insulating material 2 Core material 3 Outer packaging material 31 Surface of vacuum heat insulating material 41 Refrigerator 61 Heat insulation board

Claims (7)

A board-shaped core material and an outer packaging material of a plastic laminate film covering the core material, and a vacuum heat insulating material whose inside is sealed under reduced pressure, wherein the board-shaped core material consists of a laminate of short glass fiber webs The vacuum heat insulating material in which the webs are bonded by physical entanglement and the density of the board-shaped core material is in the range of 100 to 400 kg / m ³ . A board-shaped core material and an outer packaging material of a plastic laminate film covering the core material, and a vacuum heat insulating material whose inside is sealed under reduced pressure, wherein the board-shaped core material consists of a laminate of short glass fiber webs The vacuum heat insulating material in which the webs are joined by physical entanglement, and the board-shaped core material is plastically deformed at a density in the range of 100 to 400 kg / m ³ .   The said board-shaped core material is a vacuum heat insulating material of Claim 1 or 2 in which the smooth surface layer was formed in the at least one side outermost surface in the lamination direction of the laminated body of a web.   The vacuum heat insulating material according to any one of claims 1 to 3, wherein the short glass fibers are made of an alkali-containing glass.   The said board-shaped core material is a vacuum heat insulating material as described in any one of Claim 1 to 4 which does not contain a binder component.   A heat and cold insulation device comprising the vacuum heat insulating material according to any one of claims 1 to 5.   The heat insulation board which consists of a board-shaped core material of the vacuum heat insulating material as described in any one of Claim 1 to 5.

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