JP3580315B1 - Vacuum heat insulating material and method for manufacturing the same, heat insulating / cooling device equipped with the vacuum heat insulating material, and heat insulating board - Google Patents

Abstract

An object of the present invention is to not only prevent heat insulation performance from deteriorating due to an increase in internal pressure due to a gas component generated from a binder but also suppress heat conduction in which a binding site formed at an intersection between fibers acts as a thermal bridge. The present invention provides a high-performance vacuum heat-insulating material having excellent heat-insulating performance 10 times or more that of rigid urethane foam.
Kind Code: A1 A vacuum heat insulating material provided with a core material made of an aggregate of glass fibers and an outer packaging material having a gas barrier property for covering the core material, wherein the inside of the outer packaging material is reduced in pressure and sealed. The core 2 press-molds the glass fiber aggregate at a temperature equal to or higher than the thermal deformation temperature of the glass fiber, and retains its shape by plastically deforming the glass fiber aggregate in a pressurized state. . Since no binder is used for the core material, the heat conduction of the solid component of the core material can be reduced, and the deterioration of the heat insulation performance over time can be improved.
[Selection diagram] Fig. 1

Description

The present invention relates to a vacuum heat insulating material and a method for manufacturing the same , and a heat insulating / cooling device to which the vacuum heat insulating material is applied, and further relates to a heat insulating board.

  In recent years, energy saving has been demanded because of the importance of preventing global warming, which is a global environmental problem, and energy saving has been promoted for consumer appliances. In particular, regarding refrigerators, a heat insulating material having excellent heat insulating properties has been demanded from the viewpoint of efficiently utilizing cold heat.

  As a general heat insulating material, a fibrous body such as glass wool or a foamed body such as urethane foam is used. However, in order to improve the heat insulating properties of these heat insulating materials, it is necessary to increase the thickness of the heat insulating material and apply it. Therefore, when the space in which the heat insulating material can be installed is limited, or when space saving or effective use of the space is required, the application of the conventional heat insulating material is not desirable.

  As one means for solving such a problem, there is a core material made of a porous material, and a vacuum heat insulating material formed by covering the core material with an outer package material and sealing the inside under reduced pressure. In general, powder materials, fiber materials, and interconnected foams are used as the core material of the vacuum heat insulating material. In recent years, as the competition for energy saving has intensified, the vacuum heat insulating material having more excellent heat insulating performance has been used. Is required.

  Generally, the heat transfer mechanism of a heat insulator is caused by heat conduction, radiation, and heat flow of solid and gas components. On the other hand, the vacuum heat insulating material in which the inside of the outer packaging material is reduced in pressure has little effect on the heat conduction and convection of the gas component. In addition, when used in a temperature range equal to or lower than room temperature, there is almost no contribution of radiation. Therefore, it is important for a vacuum heat insulating material applied to a refrigerator at room temperature or lower to suppress heat conduction of solid components. Therefore, various fiber materials have been reported as core materials for vacuum insulation having excellent heat insulation performance.

  For example, a vacuum heat insulating material using a core material in which an inorganic binder material having a thermoplastic property such as boric acid is dispersed throughout a fibrous material has been proposed. This is characterized in that, as shown in FIG. 6, two adjacent glass fibers 61 and 62 form a joint portion 64 at an intersection 63 using an inorganic binder material (for example, see Patent Document 1).

  Thereby, it is possible to integrate the individual fibers of the fiber assembly. Examples of such products include blankets, mats, and insulation of insulating materials.

  Further, it has been proposed that, unlike a general-purpose resin binder, there is almost no gas component generated from the binder under vacuum conditions in the outer cover material, and the deterioration of the heat insulation performance with time is small.

  In addition, the inorganic fibers having an average fiber diameter of 2 μm or less, preferably 1 μm or less are 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 and act as a binder, and are integrated with the inorganic fibers. A vacuum heat insulating material having a core material made of a material having properties has been proposed (for example, see Patent Document 2).

  As an effect of this configuration, since a binder that binds the fibers is not included, the gas component generated from the binder under vacuum conditions in the jacket material is small, and there is no deterioration of the heat insulation performance over time. It is reported that it has excellent heat insulation performance.

  Moreover, after laminating a plurality of glass papers obtained by acid-making inorganic fibers having an average fiber diameter of 2 μm or less, preferably 1 μm or less under an acidic atmosphere, a compression treatment was performed, and the inorganic fibers were eluted from the fibers. A vacuum heat insulating material using a core material bound at each intersection by a component has been proposed (for example, see Patent Document 3).

In this configuration, the heat conduction of solid components is reduced because the fiber direction is perpendicular to the heat transfer direction in addition to the deterioration of the heat insulation performance over time being small, and the vacuum having excellent heat insulation performance is obtained. It has been proposed that thermal insulation could be provided.
Japanese Patent Publication No. 11-506708 JP-A-7-167376 JP-A-7-139691

  However, in the above-described conventional configuration, since the binder bound at the intersection of the inorganic fibers and the components eluted from the inorganic fibers act as a binder, the solidified binder and the eluted components are heated at the binding site between the fibers. Crosslinking increases heat conduction in the heat-insulating direction. 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 eluted component.

  On the other hand, a fiber body having a conventional structure without a binding site due to a binder or an eluting component has a low thermal conductivity of a solid component, but is in a bulky cotton state, and is very difficult to handle. In addition, when it is used as a core material of a vacuum heat insulating material, there is a problem that the external appearance surface property is impaired by atmospheric compression.

  The present invention solves the above-mentioned conventional problems, and not only does the heat insulation performance not deteriorate due to the increase of the internal pressure due to the gas component generated from the binder, but also the binding site formed at the intersection of the fibers is formed as a thermal bridge. An object of the present invention is to provide a high-performance vacuum heat-insulating material having excellent heat-insulating performance 10 times or more that of a conventional rigid urethane foam by suppressing the acting heat conduction.

  Further, the present invention provides a heat insulation / cooling device that can contribute to energy saving by providing a high-performance vacuum heat insulating material having heat insulation performance 10 times or more superior to that of a conventional rigid urethane foam.

In order to solve the above conventional problems, the vacuum heat insulating material of the present invention is a core material comprising a glass fiber laminate in which glass fibers are laminated in the thickness direction, and an outer packaging material having a gas barrier property for covering the core material. In the vacuum heat insulating material in which the inside of the outer packaging material is decompressed and hermetically closed, the core material is made of glass by a temperature at which the fiber starts to slightly deform due to its own weight of the glass fiber , or by a vertical load at the time of pressing. At a temperature at which the fibers can be deformed, and at a temperature at which the cross-sectional shape of the glass fibers does not change significantly, the fibers are stretched by thermal deformation of the glass fibers and bonded to each other. Instead, some of the glass fibers are entangled between the fibers to maintain the shape.

This means that the glass fiber laminate in which a part of the glass fiber is entangled, the temperature at which the fiber starts to slightly deform by the weight of the glass fiber, or the glass fiber can be deformed by the load from the vertical direction at the time of pressing. By performing pressure molding at a temperature at which the cross-sectional shape of the glass fiber does not greatly change , the glass fiber is softened and thermally deformed in a pressurized state. Thereafter, when the heating temperature is lowered, the aggregate made of glass fibers loses its elasticity before molding, and thus retains its shape at the time of pressure molding.

  Therefore, the core material made of the aggregate of glass fibers can hold the core material in a predetermined shape without any binder 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 component or a binder material eluted from the fiber. Therefore, there is no binder due to the binder component or the component eluted from the fiber at the intersection of the fibers. As a result, conventionally, since the binding sites not act as a thermal crosslinking is absent, the fibers mutual heat transfer number is greatly reduced, heat transfer is Ru is suppressed.

Further, since the effect of drawing the fibers can be expected due to the thermal deformation of the glass fiber aggregate during hot pressing, the lamination arrangement of the glass fibers is further improved, so that the thermal resistance between the fibers increases, and the heat insulating performance is increased. Improves.

From the above results, the vacuum heat insulating material of the present invention significantly improves the heat insulating performance.

  Further, since the binder component is not used, the gas generated from the binder component does not cause a problem, and a vacuum heat insulating material with little deterioration of heat insulating performance over time can be provided.

  Further, since it is not necessary to use a binder component at the time of molding the core material, the number of steps can be reduced, and efficient core material molding can be performed.

In addition, due to the anchor effect due to the entanglement of the glass fibers and the effect due to the change in shape due to the thermal deformation of the glass fibers, integrity is exhibited while the aggregate of the glass fibers is in a predetermined shape. Therefore, the core made of an aggregate of glass fibers can hold the core in a predetermined shape. In addition, since a part of the glass fiber is entangled between the fibers, the constraint and the integrity in the thickness direction are strengthened, and the rigidity of the core material is increased. The workability in the step of inserting a piece is improved. Further, the density of the core material can be easily reduced.

The invention according to claim 1 includes a core material made of a glass fiber laminate in which glass fibers are laminated in a thickness direction, and an outer packaging material having a gas barrier property for covering the core material, wherein the interior of the outer packaging material is In the vacuum heat-insulated material which is hermetically closed by decompression, the core material has a temperature at which the fibers start to slightly deform due to the weight of the glass fibers, or a temperature at which the glass fibers can be deformed by a vertical load during pressing. Therefore, the glass fiber is stretched due to thermal deformation of the glass fiber at a temperature at which the cross-sectional shape of the glass fiber does not significantly change , and a part of the glass fiber is It is a vacuum heat insulating material that is entangled between fibers and retains its shape.

Therefore, the glass fiber laminate , the temperature at which the fiber starts to slightly deform under its own weight of the glass fiber , or the temperature at which the glass fiber can be deformed by the load from the vertical direction during pressing, the cross-section of the glass fiber By performing pressure molding at a temperature at which the shape does not significantly change , the glass fibers are softened and thermally deformed in the state of being pressed. Thereafter, when the heating temperature is lowered, the aggregate made of glass fibers loses its elasticity before molding and retains its shape at the time of pressure molding.

  This is an anchor effect due to the entanglement of the glass fibers and an effect due to the shape change due to the thermal deformation of the glass fibers. These mechanical elements allow the glass fiber aggregate to be formed into a predetermined shape and to exhibit the integrity. Therefore, the core made of an aggregate of glass fibers can hold the core in a predetermined shape.

In addition, since a part of the glass fiber is entangled between the fibers, the constraint and the integrity in the thickness direction are strengthened, and the rigidity of the core material is increased. The workability in the step of inserting a piece is improved. Further, the density of the core material can be easily reduced.

  Furthermore, since there is no binding site between the fibers that has conventionally acted as a thermal crosslink, the number of heat transfer points is reduced and the amount of heat transfer is reduced, so that the vacuum heat insulating material of the present invention greatly improves the heat insulating performance. .

In addition, since the glass fibers are uniformly laminated in the thickness direction, the glass fibers constituting the core material after molding are uniformly arranged in the direction perpendicular to the thickness direction, so that the thermal resistance between the fibers further increases. I do.

Further, since the effect of drawing the fibers can be expected due to the thermal deformation of the glass fiber aggregate during hot pressing, the lamination arrangement of the glass fibers is further improved, so that the thermal resistance between the fibers increases, and the heat insulating performance is increased. Is also considered a factor.

  By the above operation, the vacuum heat insulating material of the present invention greatly improves the heat insulating performance.

The invention according to claim 2 is a vacuum heat insulating material in which the glass fiber constituting the core material according to claim 1 is glass wool. Glass wool is more desirable as a general-purpose industrial product from the viewpoint of low cost and handleability.

According to a third aspect of the present invention, the core material according to the first or second aspect is a vacuum heat insulating material that does not include a binder that binds glass fibers to each other.

Therefore, by the operation according to claim 1 or 2 , the core material made of an aggregate of glass fibers includes a bonding material that bonds the glass fibers to each other in addition to being able to hold the core material in a predetermined shape. Not. As a result, the number of heat transfer points is reduced and the amount of heat transfer is reduced because there is no binding site between the fibers which has conventionally functioned as thermal crosslinking.

  By the above operation, the heat insulating performance of the vacuum heat insulating material of the present invention is further improved.

The invention according to claim 4 includes a core material made of a glass fiber laminate in which glass fibers are laminated in the thickness direction, and an outer packaging material having a gas barrier property for covering the core material, wherein the interior of the outer packaging material is In a vacuum heat insulating material that is sealed by decompression, the core material includes a bonding material that binds the glass fibers to each other, and the temperature at which the fibers start to slightly deform due to the weight of the glass fibers, or from the vertical direction during pressing. The glass fiber is deformed by pressure at a temperature at which the glass fiber can be deformed by the load, and at a temperature at which the cross-sectional shape of the glass fiber does not significantly change, and the glass fiber is stretched by thermal deformation of the glass fiber. Is a vacuum heat insulating material in which a part of the fibers is entangled with each other to keep the shape .

Therefore, by the operation according to the first aspect , the core member made of the aggregate of the glass fibers includes a binder that bonds the glass fibers to each other in addition to being able to hold the core member in a predetermined shape. . As a result, the rigidity of the core material is greatly increased as compared with the case where the binder is not included.

  Therefore, an excellent effect can be obtained when stronger core material rigidity is required.

According to a fifth aspect of the present invention, there is provided a warming / cooling apparatus comprising the vacuum heat insulating material according to any one of the first to fourth aspects.

  Therefore, since it has excellent heat insulation performance of 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 properties of the vacuum heat insulating material are good, it is possible to manufacture a vacuum insulating material having good box surface smoothness of the heat insulation and cooling equipment.

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

According to a sixth aspect of the present invention, there is provided a heat insulating board comprising the core material of the vacuum heat insulating material according to any one of the first to third aspects.

  Therefore, since the heat insulation board is a molded body of glass fiber and does not contain an organic binder, it can be used up to about 400 ° C., which is the heat resistance temperature of glass fiber, and has high heat insulation with high heat resistance. Available as a board. In addition, there is no problem with the board rigidity, and the handleability is excellent.

  Furthermore, it has the advantages that the structure is a laminated body of glass fibers, so that there is little powder dropping, and that it does not contain any binder, so that problems such as generation of off-flavors and gas components when used at high temperatures are not caused.

The method of manufacturing a vacuum heat insulating material according to claim 7, wherein the glass fibers are laminated and arranged in the thickness direction to form a glass fiber aggregate in which fibers are partially entangled, and then the glass fiber aggregate is formed. Is the temperature at which the glass fiber starts to slightly deform under its own weight, or the temperature at which the glass fiber can be deformed due to the vertical load during pressing, and at which the cross-sectional shape of the glass fiber does not change significantly Then, it is hot-pressed, thermally deformed to the shape at the time of hot pressing, and then cooled by heat-deformation of the glass fiber aggregate in the state at the time of hot pressing, so that the shape at the time of hot pressing is maintained and the thickness direction is maintained. After making a board-shaped core material with enhanced restraint and integrity, and then drying the core material, three sides of the laminated film are sealed by heat welding and inserted into a bag-shaped outer packaging material. Then, a manufacturing method of vacuum insulation material and reducing the pressure inside the outer cover material opening sealed sealing by thermal welding.

Therefore, the restraint and the integrity in the thickness direction are strengthened, and the rigidity of the core material is increased, so that the handleability of the core material is improved, and the workability in the step of inserting the core material into the sheath material is improved.

An eighth aspect of the invention provides a method of manufacturing a vacuum heat insulating material, wherein the heating press according to the seventh aspect is performed at 480 ° C. for 5 minutes.

  In addition, the glass fiber that can be used in the present invention is not particularly limited, but a glass-forming oxide that can be in a glassy state is desirable, and furthermore, a heat-deformation temperature is low, and those that are laminated and arranged in the thickness direction are preferable. As a general-purpose industrial product, glass wool is more desirable from the viewpoint of low cost and handleability.

  Although the fiber diameter is not particularly specified, it is already known that a fiber having a fine fiber diameter can obtain more excellent heat insulating performance. However, in the conventional core material having a binding site at the intersection of the inorganic fibers, the heat insulation performance obtained only with a fine fiber diameter of 2 μm or less is achieved by the glass fiber having a fiber diameter of 3 μm or more in the present configuration. Since it is feasible, excellent heat insulation performance can be ensured even when a general-purpose glass wool is used.

  As the jacket material of the present invention, a material having gas barrier properties can be used, but it is preferable that the jacket material is a laminate film composed of a surface protective layer, a gas barrier layer, and a heat welding layer.

  Various gas adsorbents can be applied to the vacuum heat insulating material of the present invention. Examples include physical sorbents 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 is a getter agent or the like that can adsorb G.

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

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

  FIG. 2 shows a flow of a core material forming process of the core material 2 according to the first embodiment of the present invention. Further, FIG. 3 shows a micrograph of the core material of the vacuum heat insulating material according to Embodiment 1 of the present invention.

  In FIG. 1, a 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 manufactured by drying the core material 2 in a drying oven at 140 ° C. for 30 minutes, inserting the laminated film into a bag-shaped outer packaging material 3 by sealing three sides by heat welding, and inserting the laminated film into a vacuum chamber. Then, the pressure inside the outer packaging material is reduced to 10 Pa or less, and the opening is hermetically sealed by heat welding.

  At this time, the outer packaging material 3 is composed of a laminated film composed of a polyethylene terephthalate film (12 μm) as a surface protective 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.

  The adsorbent uses calcium oxide as a moisture adsorbent.

  On the other hand, the core material 2 is formed by laminating glass wool having an average fiber diameter of 3.5 μm as a glass fiber aggregate until a predetermined density is reached, and the temperature of the glass fiber is 480 or more, which is equal to or higher than the thermal deformation temperature of the glass fiber. It is molded by hot pressing at 5 ° C for 5 minutes.

  2 shows a flow of a core material forming step, which includes three steps of (a) forming a glass fiber aggregate, (b) heating press, and (c) cooling. Further, a detailed description will be given along the steps. (A) In the step of forming a glass fiber aggregate, an aggregate in which glass fibers are uniformly laminated and arranged in the thickness direction is formed. At this time, since the fiber is entangled in a part of the glass fiber aggregate, the glass fiber aggregate is given an integrity from the effect of the anchor effect. (B) In the hot pressing step, the glass fiber aggregate is thermally deformed into a shape at the time of hot pressing by heating at a temperature equal to or higher than the thermal deformation temperature of the glass fiber. Thereafter, in a cooling step (c), the aggregate of glass fibers that has been thermally deformed in the pressing state is cooled, whereby the aggregate of glass fibers is plastically deformed and the shape of the board-shaped core that has been maintained during the hot pressing is maintained. Material can be molded.

  Therefore, the core material made of the aggregate of glass fibers can hold the core material in a predetermined shape without any binder between the fibers. FIG. 3 is a micrograph 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 heat deformation temperature refers to a temperature at which the glass fiber softens and the glass fiber starts to slightly deform under its own weight, or a temperature at which the glass fiber can be deformed by a vertical load during pressing. This is a temperature at which the cross-sectional shape of the fiber is in a softened state that does not significantly change.

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

  As described above, the vacuum heat insulating material produced by this configuration has excellent heat insulating performance. This is because there is no binder due to the binder component or the component eluted from the fiber at the intersection of the fibers. Therefore, since there is no binding site conventionally acting as a thermal bridge, the number of heat transfer points between fibers is reduced, so that heat conduction in the thickness direction of the core material is reduced, and heat insulation performance is improved. .

  Furthermore, since the effect of stretching the fibers due to the thermal deformation of the glass fiber aggregate at the time of hot pressing can also be expected, the lamination arrangement of the glass fibers is further improved, so that the thermal resistance between the fibers increases, and the heat insulation is increased. We also consider that the performance is improved.

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

  Further, since it is not necessary to use a binder component at the time of molding the core material, the number of steps can be reduced, and efficient core material molding can be performed.

(Embodiment 2)
Hereinafter, the vacuum heat insulating material according to the second embodiment of the present invention will be described. The vacuum heat insulating material 1 was formed in the same manner as in Embodiment 1 except that the specifications of the core material 2 were changed.

  The core material 2 was evaluated for the presence or absence of a binder contained in the glass fiber aggregate, and the physical properties of the core material and the vacuum heat insulating material when the core material density was changed (Table 1). As a comparison, core material properties and vacuum heat insulating material properties of a core material in which a binder or a component eluted from a fiber acts as a binder in an aggregate of glass fibers were similarly evaluated.

  As a result, the thermal conductivity of the vacuum heat insulating material in the configuration of the present invention in which the binder is not specified is 0.0018 to 0.002 W / mK at an average temperature of 24 ° C., which is 10 times or more that of a general-purpose rigid urethane foam. It had heat insulation performance.

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

  Further, since it is not necessary to use a binder component at the time of molding the core material, the number of steps can be reduced, and efficient core material molding can be performed.

(Embodiment 3)
FIG. 4 is a cross-sectional view of a refrigerator-freezer according to Embodiment 3 of the present invention, which is shown as an example of a warming / cooling device.

  FIG. 4 shows a refrigerator 41, which comprises a heat insulating box 42 forming a housing of the refrigerator and a refrigeration cycle. The heat insulation box 42 includes an outer box 43 formed by pressing an iron plate and an inner box 44 formed by molding ABS resin or the like via a flange (not shown). The heat insulating box 42 is provided with the vacuum heat insulating material 1 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 blowing agent.

  The heat insulating box 42 is divided 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 fan motor 50 for cooling and a differential heater 51 are attached to the inner box 44 of the freezing compartment 48.

  On the other hand, in the refrigerating cycle, an evaporator 52, a compressor 53, a condenser 54, and a capillary tube 55 are sequentially connected to form an annular shape. In addition, the evaporator 52 may be provided in two places of the refrigerating room 47 and the freezing room 48, and they may be connected in series or in parallel to form a refrigerating cycle.

  Further, a door body 56 is attached to the refrigerator 41, the vacuum heat insulating material 1 is provided inside the door body 56, and a space other than the vacuum heat insulating material 1 is foam-filled with a hard urethane foam 45. I have.

  The vacuum heat insulating material 1 has the same configuration as that shown in the first embodiment.

The refrigerator having the above-described structure has excellent heat insulation performance, which is 10 times or more that of the conventional rigid urethane foam, and thus achieves high heat insulation and contributes to energy saving .

In addition, since the core material of the vacuum heat insulating material is not bound by the binder, the heat insulation performance does not deteriorate due to an increase in the internal pressure due to the gas component generated from the binder, and the heat insulation performance deteriorates with time. It is possible to continuously contribute to energy saving.

Incidentally, heat insulation cold appliance of the present invention, refrigerators, refrigeration equipment, vegetables cold storage, and rice is the operating temperature range of the cool box, etc. - normal temperature 30 ° C., and more vending machines, to higher temperatures such as hot water tank Refers to equipment that uses thermal energy in the range of Further, the present invention is not limited to electric equipment, but also includes gas equipment and the like.

(Embodiment 4)
FIG. 5 is a perspective view of a heat insulating board according to Embodiment 4 of the present invention.

  FIG. 5 shows a heat insulating board 59 in which the core material of the vacuum heat insulating material shown in the first embodiment is directly used as a heat insulating board.

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

  In addition, the heat insulating board of this configuration is a molded body of glass fiber and does not contain an organic binder, so that it can be used up to about 400 ° C., which is the heat resistant temperature of glass fiber, and has excellent heat resistance. Can be used as a high-performance insulation board. Also, there is no problem in board rigidity, and the handleability is excellent.

  In addition, it has the advantage that the structure is a laminate of glass fibers, so that there is little powder falling off, and since it does not contain any binder, there is no problem such as generation of off-flavors and gas components when used at high temperatures. ing.

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

  As a result, it is possible to efficiently use hot and cold heat, including refrigerators and refrigerators, and to contribute to energy saving of all devices. Further, the present invention can be applied to all kinds of heat insulation, heat shielding use, heat damage countermeasure use, and the like of objects to be protected from heat and cold.

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

Sectional schematic view of the vacuum heat insulating material according to Embodiment 1 of the present invention. Process drawing showing a process of forming a core material of a vacuum heat insulating material according to Embodiment 1 of the present invention. Photomicrograph of core material according to Embodiment 1 of the present invention Sectional view of a refrigerator-freezer according to Embodiment 3 of the present invention. 4 is a perspective view of a heat insulating board according to Embodiment 4 of the present invention. Schematic diagram of the intersection of the core material in Patent Document 1

Explanation of reference numerals

DESCRIPTION OF SYMBOLS 1 Vacuum insulation material 2 Core material 3 Outer packaging material 41 Refrigerator 59 Insulation board

Claims (8)

A vacuum heat insulating material comprising: a core material made of a glass fiber laminate in which glass fibers are laminated in a thickness direction ; and an outer packaging material having a gas barrier property for covering the core material. In the core material , the temperature at which the fiber starts to be slightly deformed by its own weight of the glass fiber , or the temperature at which the glass fiber can be deformed by the load from the vertical direction at the time of pressing, the cross-sectional shape of the glass fiber is large At a temperature that does not change, the fibers are stretched due to thermal deformation of the glass fibers due to pressure molding , and some of the glass fibers are not tied to each other but are entangled between the fibers to maintain the shape Has vacuum insulation. The vacuum heat insulating material according to claim 1, wherein the glass fiber is glass wool . The vacuum heat insulating material according to claim 1 , wherein the core material does not include a binding material that binds the glass fibers to each other . A vacuum heat insulating material comprising: a core material made of a glass fiber laminate in which glass fibers are laminated in a thickness direction ; and an outer packaging material having a gas barrier property for covering the core material. In the above, the core material includes a binder for binding the glass fibers to each other, and the glass fibers can be deformed by the temperature at which the fibers start to slightly deform due to the weight of the glass fibers, or by the load from the vertical direction at the time of pressing. The temperature is such that the cross-sectional shape of the glass fiber does not change significantly, and the fiber is stretched due to the thermal deformation of the glass fiber under pressure, and a part of the glass fiber is entangled between the fibers. Vacuum insulation material that keeps its shape together . A heat insulation / cooling device comprising the vacuum heat insulating material according to claim 1. A heat insulating board comprising the core material of the vacuum heat insulating material according to claim 1. The glass fibers are laminated and arranged in the thickness direction to form a glass fiber aggregate in which fibers are partially entangled, and then the glass fiber aggregate is heated at a temperature at which the fibers start to slightly deform due to the weight of the glass fibers, Alternatively, heat-press at a temperature at which the glass fiber can be deformed by applying a load from the vertical direction during pressing, but do not significantly change the cross-sectional shape of the glass fiber, and thermally deform to the shape at the time of hot pressing. Then, by cooling the glass fiber aggregate thermally deformed in the state of the hot press, the shape of the hot press is maintained, and a board-shaped core material with enhanced restraint and integrity in the thickness direction is formed. Then, after drying the core material, three sides of the laminated film are sealed by heat welding and inserted into a bag-shaped outer packaging material, and then the inside of the outer packaging material is depressurized and the opening is thermally welded. Manufacturing method of the vacuum heat insulating material for hermetic seal. The method according to claim 7, wherein the heating press is performed at 480 ° C. for 5 minutes.

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