JP2005114013A - Vacuum insulation - Google Patents

Abstract

The conventional vacuum heat insulating material can maintain heat insulating performance over time when the use atmosphere is 100 ° C. or lower, but cannot maintain heat insulation performance when the use atmosphere becomes higher than that. It was. In addition, when used inside precision equipment, the vacuum heat insulating material has been required to have flame-retardant properties.
SOLUTION: A heat welding layer of a jacket material is a film having a melting point of 150 ° C. or more and 200 ° C. or less, an outermost layer of the jacket material is a self-extinguishing film property having a melting point of 200 ° C. or more, and one gas barrier layer is a metal foil In the vacuum heat insulating material that is a resin film on which the other gas barrier layer is deposited, the fin portion around the vacuum heat insulating material is directed in the direction opposite to the heat source, and the outer cover material on the metal foil side is directed to the heat source side. By disposing, even in a high-temperature atmosphere, it is possible to suppress a decrease in barrier properties, maintain heat insulation performance for a long period of time, and ensure flame retardancy as a vacuum heat insulating material.
[Selection] Figure 5

Description

  The present invention relates to a vacuum heat insulating material.

  In recent years, while the global environment protection has been greatly screamed, energy saving of home appliances has become an important issue to be addressed urgently. As one of these solutions, there is application of a high-performance heat insulating material, that is, a vacuum heat insulating material for the purpose of preventing useless transfer of heat. The vacuum heat insulating material is a heat insulating material in which a foamed resin, a fiber material, or the like is used as a core material and is put in a jacket material, and the heat conductivity of gas is remarkably lowered by evacuating the inside of the heat insulating material. In order to maintain the heat insulation performance over a long period of time, the inside of the heat insulating material is kept in a vacuum.

  As an example of applying a vacuum heat insulating material to a refrigerator that is a home appliance, an outer box made of iron plate, an inner box made of ABS resin, a foam heat insulating material filled in a space formed by the outer box and the inner box, In the heat insulation wall made of, there is a method of pasting a vacuum heat insulating material in advance on the inner surface of the heat insulating wall, and making it an integral structure together with the foam heat insulating material, by arranging the vacuum heat insulating material on both sides and the back side of the freezer, The power consumption can be efficiently reduced (see, for example, Patent Document 1).

  In addition, as an example applied to an electric water heater that is a home appliance, a vacuum heat insulating material is provided on the outer periphery of the water storage container, the metal foil layer of the gas barrier layer in the film laminated with the vacuum heat insulating material is on the high temperature side, and the vapor deposition layer is on the low temperature side Use. Thereby, on the high temperature side, the gas barrier property is good and a vacuum state can be maintained at a temperature of about 100 ° C., and the heat insulating property can be maintained for a long time. Moreover, the heat which flows in along metal foil can be suppressed by using a vapor deposition layer on the low temperature side, and the heat insulation performance of the whole vacuum heat insulating material can be improved (for example, refer patent document 2).

In addition, to solve the problem of many gas intrusions from the vapor deposition layer side, a vacuum heat insulating material that further improves the temporal reliability by laminating an aluminum foil of a size that does not cover the seal part on the outer layer of the vapor deposition layer There is also an example that provides (see, for example, Patent Document 3).
Japanese Patent Laid-Open No. 10-205995 JP 2001-8828 A JP 2001-32992 A

  However, the conventional vacuum heat insulating material was able to maintain the heat insulating performance sufficiently over time when the use atmosphere was 100 ° C. or less like a refrigerator or an electric water heater. When the usage atmosphere is about 150 ° C., such as when heat generated from the heater of the apparatus is insulated, the heat insulation performance cannot be maintained over time.

  In addition, the conventional vacuum insulation material using a flammable film such as nylon film or polyethylene terephthalate film as the outermost layer of the jacket material, and a flammable film such as high-density polyethylene or unstretched polypropylene as the heat-welded layer. When used inside precision equipment, vacuum insulation does not have flame retardant properties, but other parts inside precision equipment have flame retardant properties, so that vacuum insulation is also flame retardant. Sex was demanded. Especially when attaching ultra-thin vacuum insulation material with a thickness of 2mm or less in a small space inside a notebook personal computer, the precision parts inside the PC and the vacuum insulation material are in close contact with each other. There was a strong demand for flame retardant properties.

  An object of the present invention is to provide a vacuum heat insulating material capable of maintaining heat insulating performance over time even in a high temperature region such as 150 ° C. or higher. In addition, it is intended to provide a flame retardant property to a jacket material having a laminate structure so that a vacuum heat insulating material can be used even inside a precision instrument. It is used inside a printing apparatus such as a printer or a notebook personal computer, and aims to protect the toner of the printing apparatus and prevent the surface of the notebook personal computer from causing discomfort to the user.

  In order to solve the above-mentioned problems, the present invention comprises a core material and a jacket material having a laminate structure, a gas barrier layer is a metal foil or a deposited resin film, and a thermal welding layer of the jacket material has a melting point of 150 ° C. A film having a temperature of 200 ° C. or lower and a vacuum heat insulating material provided with a self-extinguishing film having a melting point of 200 ° C. or higher as the outermost layer of the jacket material, and the outermost layer of the jacket material of the vacuum heat insulating material is flame retardant. Therefore, flame retardancy can be imparted.

  According to the vacuum heat insulating seat of the present invention, a core material and a jacket material having a laminate structure are provided, a gas barrier layer is a metal foil or a deposited resin film, and a heat welding layer of the jacket material has a melting point of 150 ° C. A film having a temperature of 200 ° C. or lower and a vacuum heat insulating material provided with a self-extinguishing film having a melting point of 200 ° C. or higher as the outermost layer of the jacket material, and the outermost layer of the jacket material of the vacuum heat insulating material is flame retardant. Therefore, flame retardancy can be imparted.

  The invention according to claim 1 includes a core material and a jacket material having a laminate structure, wherein the gas barrier layer is a metal foil or a deposited resin film, and the thermal welding layer of the jacket material has a melting point of 150 ° C. or more and 200 ° C. Since the outermost layer of the coating material of the vacuum insulating material is a flame insulating material, the outermost layer of the coating material of the vacuum insulating material is a vacuum heat insulating material provided with a self-extinguishing film having a melting point of 200 ° C. or higher. The effect which can provide a flame retardance is acquired.

  The invention according to claim 2 is a vacuum heat insulating material in which the heat-welding layer of the jacket material is an unstretched polypropylene film, and the heat-welding of this vacuum heat-insulating material has the highest melting point and is 160 ° C. unstretched polypropylene. Because the film is used, its melting point is about 30 ° C higher than that of high-density polyethylene film and low-density polyethylene film. Even if it is used up to a higher temperature than when it is used, the effect of maintaining reliability can be obtained.

  Invention of Claim 3 is a vacuum heat insulating material whose outermost layer of a jacket material is a fluorine-type film and an imide-type film, Since these films are flame-retardant and melting | fusing point is high or does not exist And the vacuum heat insulating material using these films is effective in obtaining a flame retardant effect and widening the applicable temperature range. In addition, even if the fin portion generated when the vacuum heat insulating material is produced is bent and used at a high temperature, these films are excellent in bendability. The effect which can prevent that a pinhole generate | occur | produces in the jacket material of a material is acquired.

In the invention according to claim 4, the film of the second layer which is the inner side of the outermost layer of the jacket material is a film conforming to UL94 VTM-2 or more, and in the vacuum heat insulating material using the jacket material, It is possible to increase the total thickness of the jacket material while keeping the thickness of the expensive outermost layer of the material, thereby obtaining the effect of preventing the occurrence of pinholes in the jacket material.
Moreover, the film of the second layer is a film of UL94 VTM-2 compliant or higher and does not cause a failure that does not melt and form a layer during heat welding. In addition, by configuring the second layer, it is possible to design a reasonable jacket material that achieves both performance and cost by reducing the thickness of the expensive outermost layer and increasing the thickness of the second layer. .

  Invention of Claim 5 is a vacuum heat insulating material which provided the flame retardant adhesive tape of UL510 FR conformity so that the cross section of a jacket material might be covered in the fin part around a vacuum heat insulating material, Since a flame-retardant adhesive tape conforming to UL510 FR is provided so as to cover the cross section of the material, a non-flame retardant film such as a heat-welded layer is exposed in the cross section of the jacket material even when used without folding the fin portion Therefore, the effect of ensuring the flame retardancy of the fin portion is obtained.

  The invention according to claim 6 is a vacuum heat insulating material in which a flame retardant sealer is applied to a fin portion around a vacuum heat insulating material so as to cover a cross section of the outer cover material, and the fin portion is covered with a cross section of the outer cover material. Since the flame retardant sealer is applied to the surface of the outer cover, the flame retardant can be secured because the non-flame retardant film such as the heat-welded layer is not exposed in the cross section of the outer jacket material even when the fin portion is not folded. An effect is obtained. In addition, since the flame retardant sealer is applied, when using a flame retardant tape, it is necessary to position the tape, press the tape after application, and cut the tape. The effect that work becomes easy is acquired.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In addition, about the same structure as the past, the same code | symbol is attached | subjected and detailed description is abbreviate | omitted.

(Embodiment 1)
1 is a cross-sectional view of a vacuum heat insulating material according to Embodiment 1 of the present invention, and FIG. 2 is a cross-sectional view of a main part of the vacuum heat insulating material.

  The vacuum heat insulating material 1 is produced by putting the core material 2 in the outer covering material 3 and performing vacuum drawing. For the outermost layer film 4 of the jacket material 3, a self-extinguishing fluorine-based film, polyimide film or polyetherimide film is selected.

  Specific examples of the fluorine film include CTFE (chlorotrifluoroethylene) having a melting point of 210 ° C., ETFE (copolymer of ethylene tetrafluoride and ethylene) having a melting point of 260 ° C., and FEP (tetrafluoroethylene and tetrafluoroethylene) having a melting point of 270 ° C. Copolymer of propylene hexafluoride), PFA (copolymer of tetrafluoroethylene and perfluoroalkoxyethylene) having a melting point of 310 ° C, TFE (tetrafluoroethylene) having a melting point of 330 ° C can be used. If it is a fluorine-type film whose melting | fusing point is 200 degreeC or more, it will not specify in particular.

  An unstretched polypropylene film having a melting point of 160 ° C. is selected for the heat welding layer 5 of the jacket material 3.

  The gas barrier layer 6 is a metal foil or a resin film on which metal, silica, ceramic or the like is deposited, and one of them is not specified. Specifically, aluminum foil is often used as the metal foil, and iron, nickel, platinum, tin, titanium, stainless steel, and carbon steel are used as other metals that have less heat flowing along the metal foil around the vacuum insulation material. it can.

  When the vacuum heat insulating material 1 is produced using the jacket material 3 and the core material 2, the following effects are obtained. Since the outermost layer film 4 of the jacket material 3 is composed of a fluorine-based film, a polyimide film, or a polyetherimide film having a melting point of 200 ° C. or higher, flame retardant of the vacuum heat insulating material 1 is achieved. Moreover, since the continuous maximum use temperature of these outermost layer films 4 is 120 degreeC or more, the effect which can arrange | position and use a vacuum heat insulating material toward the heat source of 120 degreeC or more is acquired. Moreover, since these films are excellent in flexibility, even if the fins of the vacuum heat insulating material 1 are folded and used, cracks are generated in the outermost layer film 4, which triggers the jacket material of the vacuum heat insulating material 1. 3 can be prevented from generating pinholes.

  In addition, although the bag shape of the jacket material 3 includes a four-side seal bag, a gusset bag, a three-side seal bag, a pillow bag, a center tape seal bag, etc., it is not particularly specified.

  As the core material 2, open-cell bodies of polymer materials such as polystyrene and polyurethane, inorganic and organic powders, inorganic and organic fiber materials, and the like can be used. For use at high temperatures, inorganic powders such as agglomerated silica powder, foamed perlite ground powder, diatomaceous earth powder, calcium silicate powder, calcium carbonate powder, clay and talc, and inorganic fibers such as glass wool and ceramic fibers are preferred. An inorganic powder having a next aggregated particle size of 20 μm or less is desirable. Since these powders have very fine particles, the contact thermal resistance between the particles increases, the solid thermal conductivity decreases, and even under a pressure of 10 Torr or less, very small thermal conductivity is exhibited regardless of the pressure. Is. For this reason, it is an optimal material for use in high temperature conditions where the motion of air molecules is large.

(Embodiment 2)
FIG. 3 is a cross-sectional view of a main part of the vacuum heat insulating material in Embodiment 2 of the present invention.

  The vacuum heat insulating material 7 is produced by putting the core material 2 in the outer cover material 8 and performing vacuuming. As the outermost layer film 4 of the jacket material 3, a fluorine-based film, a polyimide film, or a polyetherimide film is selected.

  A second layer film 9 is provided inside the outermost layer of the jacket material 8, and the second layer film 9 is a film having a higher melting point than the heat welding layer 5. Specifically, films such as PET (polyethylene terephthalate) having a melting point of 260 ° C., PEN (polyethylene naphthalate) having a melting point of 270 ° C., and PPS (polyphenylene sulfide) having a melting point of 270 ° C. are candidates.

  When the vacuum heat insulating material 7 is produced using the jacket material 8 and the core material 2, the following effects are obtained.

  The fluorine film, polyimide film or polyetherimide film which is the outermost layer film 4 of the jacket material 8 is more expensive than films such as polyethylene terephthalate film, polyethylene naphthalate and polyphenylene sulfide. For this reason, although it is a significant cost increase for the thickness increase of the outermost layer film 4 which is one proposal for dealing with pinholes, the performance is improved by increasing the thickness of the second layer film 9 instead. The effect which can design the rational jacket material in which cost was compatible is acquired. Furthermore, the effect that the thickness of the outermost layer film 4 can be reduced by further increasing the thickness of the second layer film 9 is also obtained.

(Embodiment 3)
FIG. 4 is a cross-sectional view of the vacuum heat insulating material in Embodiment 3 of the present invention. FIG. 5 is a cross-sectional view of a main part of the vacuum heat insulating material in Embodiment 3, and FIG. 6 is an installation view of the vacuum heat insulating material to the heat source.

  In FIG. 4, 10 is a vacuum heat insulating material, 11 is a part of the jacket material 12 that is in direct contact with the core material 2, and the heat seal portion 13 and the close contact portion 14 are not in direct contact with the core material. The heat seal portion 13 and the close contact portion 14 are collectively referred to as a fin portion 15.

  In FIG. 5, an unstretched polypropylene film having a melting point of 160 ° C. is selected for the heat welding layer 16 of the jacket material 12. The heat seal part 13 prevents air and water vapor from entering the inside of the vacuum heat insulating material 10 from the outside by thermally welding a heat welding layer 16 which is the innermost layer of the jacket material 12. The gas barrier layer 17 is a metal foil or a resin film on which metal, silica, or ceramic is deposited, and one of them is not specified.

  Moreover, the outermost layer film 18 is a fluorine-based film, a polyimide film, or a polyetherimide film having a flame resistance at a melting point of 200 ° C. or higher. Thereby, the flame insulation of the vacuum heat insulating material 10 can be achieved. Moreover, since these films are excellent in flexibility, even if the fins of the vacuum heat insulating material 10 are folded and used, cracks are generated in the outermost layer film 18, which triggers the jacket material of the vacuum heat insulating material 10. 12 can be prevented from generating pinholes.

  FIG. 6 is a cross-sectional view in which the vacuum heat insulating material 10 is installed in the heat source 20. At this time, at least one gas barrier layer 17 of the vacuum heat insulating material 10 is a metal foil 19, and the gas barrier 17 of the metal foil 19 is installed facing the heat source 20. Moreover, the fin part 15 is installed so as to face the opposite side with respect to the heat source 20.

  When the vacuum heat insulating material 10 is installed in such a configuration, since the fin portion 15 is installed so as to face the opposite side with respect to the heat source 20, the temperature thereof is significantly lower than that of the heat source 20. Even if 20 is a temperature of 150 ° C., the temperature of the fin portion 15 is about 100 ° C., and an effect that an unstretched polypropylene film having a melting point of 160 ° C. can be applied is obtained, and the fin portion 26 does not need to be folded. In addition, since the temperature of the heat seal portion 13 is further lowered, the effect of ensuring the performance of the vacuum heat insulating material for a long period of time can be obtained by reducing the amount of air entering the vacuum heat insulating material 10 through the unstretched polypropylene film. .

  Further, the gas barrier layer 17 has a specification in which the covering material 12 on the metal foil 19 side is disposed on the heat source 20 side, and the gas permeability of the metal foil 19 is 0, so that the amount of air entering from the heat source 20 side is suppressed. Can do. Moreover, since the metal foil 19 has very high heat resistance, the use temperature as the vacuum heat insulating material 10 is independent of the heat resistance temperature of the vapor deposited resin film as compared with the case where the resin film vapor deposited on the heat source 20 side is used. The effect that can be determined is obtained.

(Embodiment 4)
FIG. 7 is a cross-sectional view of the vacuum heat insulating material in Embodiment 4 of the present invention.

  In FIG. 7, the vacuum heat insulating material 10 is the same as that of the third embodiment, and a flame retardant adhesive tape 21 compliant with UL510 FR is provided on the fin portion 15 so as to cover the cross section of the jacket material 12.

  Since the flame retardant adhesive tape 21 is provided on the fin portion 15 so as to cover the cross section of the jacket material 12, even when the fin portion 15 is used without being folded, the heat welding layer 16 is formed on the cross section of the jacket material 12. Since the non-flame retardant film such as the above is not exposed, an effect of ensuring the flame retardancy of the fin portion 15 is obtained.

  Instead of the adhesive tape 21, a flame retardant sealer 42 may be applied. In this case, when the adhesive tape 21 is used, it is necessary to position the tape, press the tape after application, and cut the tape, but in comparison with this, the flame retardant sealer 42 is only applied. The effect that the operation can be simplified is obtained.

  Further, if the fin portion 15 is bent to the opposite side of the heat source 20 and fixed with the adhesive tape 21 so that the entire end face of the fin portion 15 is hidden, the area of the vacuum heat insulating material 10 is reduced and the heat resistance of the fin portion 15 is also improved. improves.

  As described above, the vacuum heat insulating material according to the present invention can impart flame retardancy to the outermost layer of the jacket material, can improve the reliability of the vacuum heat insulating material, and a printing apparatus using this vacuum heat insulating material. It can also be effectively applied in the product field such as notebook personal computers.

Sectional drawing of the vacuum heat insulating material in Embodiment 1 of this invention Sectional drawing of the principal part of the vacuum heat insulating material in Embodiment 1 of this invention Sectional drawing of the principal part of the vacuum heat insulating material in Embodiment 2 of this invention Sectional drawing of the principal part of the vacuum heat insulating material in Embodiment 3 of this invention Sectional drawing of the principal part of the vacuum heat insulating material in Embodiment 3 of this invention Installation drawing of vacuum heat insulating material in Embodiment 3 of the present invention Sectional drawing of the vacuum heat insulating material in Embodiment 4 of this invention

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Vacuum heat insulating material 2 Core material 3 Outer coating material 4 Outermost layer film 5 Heat welding layer 7 Vacuum heat insulating material 8 Outer covering material 9 Second layer film 10 Vacuum heat insulating material 12 Outer covering material 13 Heat seal part 15 Fin part 16 Heat welding layer 17 Gas barrier layer 19 Metal foil 20 Heat source 21 Flame retardant adhesive tape

Claims (6)

Comprising a core material and a jacket material having a laminate structure, wherein the gas barrier layer of the jacket material is a metal foil or a deposited resin film, the heat-welded layer is a film having a melting point of 150 ° C. or higher and 200 ° C. or lower, and the outermost layer is a melting point A vacuum heat insulating material characterized by being a self-extinguishing film of 200 ° C or higher. The vacuum heat insulating material according to claim 1, wherein the heat-welded layer of the jacket material is an unstretched polypropylene film. 3. The vacuum heat insulating material according to claim 1, wherein the outermost layer of the covering material is a fluorine film or an imide film. 4. The vacuum according to claim 1, further comprising a film serving as a second layer inside an outermost layer of the jacket material, wherein the second layer film is a film conforming to UL94VTM-2 or more. Insulation. The flame retardant adhesive tape according to UL510 FR is provided so as to cover the cross section of the jacket material around the fin portion around the vacuum heat insulating material, according to any one of claims 1 to 4. Vacuum insulation. The vacuum heat insulating material according to any one of claims 1 to 4, wherein a flame retardant sealer is applied to a fin portion around the vacuum heat insulating material so as to cover a cross section of the jacket material.

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