JP2004332929A - Vacuum heat insulating material and device with vacuum heat insulating material - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vacuum heat insulating material capable of withstanding a high temperature of 150°C, maintaining heat insulating performance for a long period, and having inflammability. <P>SOLUTION: A resin film having a melting point of 200°C or higher is used for the thermally deposited layers 4a and 4b of the outer covering material in laminated structure of the vacuum thermal insulating material 1, and a film having a melting point higher than the film of thermally deposited layers 4a and 4b is used for gas barrier layers 5a and 5b and protective layers 6a, 6b, 7a, and 7b. Also, a fin part is bent and fixed to a low temperature side with an inflammable tape for protection. By this, the lowering of gas barrier property can be suppressed even in high temperature atmosphere of approx. 150°C, the thermal insulation performance can be maintained for a long period, and the vacuum heat insulating material 1 having the inflammability can be provided. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  TECHNICAL FIELD The present invention relates to a vacuum heat insulating material and an apparatus using the vacuum heat insulating material. And heat retention.

  Vacuum insulation material is a heat insulation material in which the thermal conductivity of gas is significantly reduced by putting a foamed resin, powder, fiber material, or the like as a core material in a jacket material, and evacuating the inside of the jacket material, In order to maintain the heat insulation performance for a long period of time, the inside of the heat insulating material is kept at a vacuum.

  In some cases, this vacuum heat insulating material is provided on the outer periphery of a water storage container of an electric water heater, which is a home electric appliance, to insulate the water, and to greatly reduce the heat retaining power. This is a gas barrier layer in a laminated film that constitutes a vacuum heat insulating material, in which a metal foil is used on a side exposed to high temperature, a vapor deposition layer is used on a low temperature side, and a gas barrier property is used at a temperature of about 100 ° C. on a high temperature side. Is good, can maintain a vacuum state, can maintain heat insulation for a long period of time, and on the low temperature side, can suppress the heat flowing through the metal foil by using a vapor deposition layer. This is an improvement (for example, see Patent Document 1).

On the other hand, the conventional vacuum heat insulating material composed of a general resin film as a jacket material can be used only at a temperature slightly higher than 100 ° C. For example, in a fixing device such as a copying machine, an engineering resin having heat insulating heat resistance is used. Is used to provide an outer frame portion having a fixing portion such as a fixing roller and a paper discharging roller (for example, see Patent Document 2).
JP 2001-8828 A JP-A-57-155570

  As described above, the conventional vacuum heat insulating material can sufficiently maintain the heat insulating performance for a long period of time when the temperature of the use site is 100 ° C. or lower like an electric water heater. When the temperature of the used part is about 150 ° C, such as a part where a heater is provided on the bottom of the hot water storage container or a fixing device used for a copying machine or a laser printer, the heat resistance is gradually reduced. The degree of vacuum decreased, and it was not possible to maintain the predetermined heat insulating performance over a long period of time.

  In addition, the jacket material of the conventional vacuum heat insulating material is made of a non-flame-retardant film such as a nylon film or a polyethylene terephthalate film, and does not have a flame-retardant property. Similarly, flame retardancy has also been required for vacuum insulation materials. In particular, in the case of disposing in a small space such as the inside of a notebook personal computer, even a vacuum insulating material having a reduced thickness is required to be flame-retardant because it is close to precision parts inside the personal computer.

  An object of the present invention is to provide a vacuum heat insulating material capable of maintaining heat insulating performance over a long period of time even in a high-temperature region of 150 ° C. or more by imparting heat resistance to a laminate structure of a jacket material. I do.

  Although Patent Document 2 suggests the use of a reduced-pressure double-wall structure using a thin metal plate as a heat insulating layer and the use of ceramic heat insulating properties, it can be said that this is embodied by a vacuum heat insulating material.

  Another object of the present invention is to provide flame retardancy to a jacket material having a laminate structure to ensure safety even when a vacuum heat insulating material is used inside an electronic device or the like.

  The present invention provides, in a vacuum heat insulating material comprising a core material, a laminated material having a heat-welding layer, a gas barrier layer, and a protective layer, the heat-welding layer is made of a resin film having a melting point of 200 ° C or more, The resin film of the gas barrier layer and the protective layer has a melting point higher than the melting point of the resin film of the heat welding layer.

  As a result, even in a high-temperature atmosphere of about 150 ° C., the film of the heat-sealing layer does not melt out, and a decrease in gas barrier properties can be suppressed to a small extent. The heat insulating performance of the vacuum heat insulating material can be maintained.

  Further, even when the outer cover material is thermally welded, the film used for the gas barrier layer and the protective layer does not melt, and a highly reliable vacuum heat insulating material can be manufactured.

  According to the present invention, the heat-sealing layer of the coating material of the laminate structure is made of a film having a melting point of 200 ° C. or more, so that a decrease in gas barrier properties can be suppressed even at a high temperature of about 150 ° C. Insulation performance of the material can be maintained, and a film with a melting point higher than that of the heat-sealing layer is used for the gas barrier layer and the protective layer. Materials can be made.

  The invention of a vacuum heat insulating material according to claim 1 of the present invention includes a core material, a jacket material having a laminated structure having a heat welding layer, a gas barrier layer, and a protective layer, and the heat welding layer has a melting point of 200 ° C. The melting point of the resin film of the gas barrier layer and the protective layer is higher than the melting point of the resin film of the heat welding layer.

  Assuming that the ambient temperature at which the vacuum heat insulating material can be used is a temperature 50 K lower than the melting point of the film of the heat welding layer, the film of the heat welding layer melts even in a high temperature atmosphere of about 150 ° C. if the film has a melting point of 200 ° C. or more. Therefore, the lowering of the gas barrier property can be suppressed, and the heat insulating performance of the vacuum heat insulating material can be maintained for a long period of time even when used in product parts exposed to a high-temperature atmosphere.

  In addition, since a film having a higher melting point than the heat-sealing layer film is used for the gas barrier layer and the protective layer, the film used for the gas barrier layer and the protective layer does not dissolve even when the outer cover material is heat-welded. A highly reliable vacuum heat insulating material can be manufactured.

  The invention of a vacuum heat insulating material according to a second aspect of the present invention is the invention according to the first aspect, wherein the heat-sealing layer, the gas barrier layer, and the protective layer of the outer cover material are VTM-2 or more according to UL94 standard. It is characterized in that it is a flame-retardant film, and it is possible to make the jacket material having a laminate structure flame-retardant, and also to impart flame retardancy as a vacuum heat insulating material. Therefore, safety when using the vacuum heat insulating material can be improved.

  According to a third aspect of the present invention, there is provided a vacuum heat insulating material according to the first or second aspect, wherein the heat-sealing layer is a fluororesin film, and these films have a considerable melting point. High and flame retardant.

  According to a fourth aspect of the present invention, there is provided a vacuum heat insulating material according to any one of the first to third aspects, wherein the heat welding layer is a polychlorotrifluoroethylene film, It is easy to use and economical because it has a low melting point even among fluororesin films.

  The invention of a vacuum heat insulating material according to claim 5 of the present invention comprises a core material, a jacket material having a laminated structure having a heat welding layer, a gas barrier layer, and a protective layer, wherein the heat welding layer has a melting point of 200 ° C. When the protective layer is made of a film having a melting point of 200 ° C. or more, the core layer is covered with the jacket material, the inside is decompressed, and the core area is sealed by heat welding. The fin portion of the formed jacket material is bent to the low temperature side of the opposing heat insulating surface.

  When the core material is covered with the jacket material and the inside is decompressed and the periphery of the core material is sealed by heat welding, a jacket comprising the heat-welded portion and a portion closely adhered without the core material inside. Since the fin portion of the material is bent to the low-temperature side of the opposing heat-insulating surface, in other words, to the side opposite to the heat-generating portion, the heat-welded portion can be protected from high temperatures. For example, even if the temperature of the high-temperature portion side surface of the vacuum heat insulating material becomes 150 ° C., the heat-welded portion located on the low-temperature side heat insulating surface can be maintained at 100 ° C. or less. Therefore, it is not necessary to use a film having a melting point of 200 ° C. or more for the heat-welding layer, and the vacuum heat insulating material can be made of an inexpensive material.

  The invention of a vacuum heat insulating material according to a sixth aspect of the present invention is the invention according to any one of the first to fifth aspects, wherein the gas barrier layer is formed of a metal, metal oxide, and silica on a polyethylene naphthalate film. Either one of the vapor depositions is performed, and a coating of acrylic acid is performed thereon. This gas barrier layer is made of polyethylene terephthalate whose substrate has a continuous maximum operating temperature of 160 ° C. The heat resistance of the coating is 200 ° C. or higher, so the heat resistance is excellent. The gas barrier property is dramatically improved because the polyethylene terephthalate has a vapor-deposited layer treated for the purpose of improving the gas barrier property and an acrylic acid coating layer. Therefore, it can be used as a substitute for the metal foil used on the high temperature side, and by using this on the low temperature side, the gas It is possible to improve the rear of. In addition, since the acrylic acid coating has very good bending resistance, the effect of increasing the amount of gas penetration due to bending of the fin portion and suppressing the generation of pinholes can be obtained.

  The invention of a vacuum heat insulating material according to claim 7 of the present invention is the invention according to any one of claims 1 to 5, wherein the gas barrier layer is formed by coating a polyethylene naphthalate film with acrylic acid. A metal, metal oxide, or one of silica is deposited thereon, and can be used as a substitute for a metal foil as described above. By using this on the low temperature side, its excellent gas barrier effect is obtained. Thus, the gas barrier property of the laminate film can be improved, and the acrylic acid coating is hard to be peeled off, so that by forming the acrylic acid coating on the vapor deposition layer, the vapor deposition layer can be protected. In addition, since the acrylic acid coating has very good bending resistance, the effect of increasing the amount of gas penetration due to bending of the fin portion and suppressing the generation of pinholes can be obtained.

  The invention of a vacuum heat insulating material according to claim 8 of the present invention is the invention according to any one of claims 1 to 5, wherein at least one of the gas barrier layers is formed of an aramid-based film, It is a film formed by vapor deposition of either a metal oxide or silica.

  When an aramid film having a glass transition temperature of 270 ° C and excellent gas barrier properties even at high temperatures is used as the base material of the film on which the gas barrier layer on the high temperature side is deposited, the gas barrier layer is deposited on a heat source of about 150 ° C. Even when the film surface is mounted, gas infiltration into the vacuum heat insulating material can be suppressed to a small level, and heat insulating performance can be maintained. Therefore, a decrease in the heat insulation performance due to heat transmitted through the metal can be suppressed, and the heat insulation performance can be maintained even at a high temperature of about 150 ° C.

  In addition, since a long-term heat-resistant temperature of UL746B calculated from the half-life of mechanical properties of the aramid-based film is used for the gas barrier layer, a conventional ethylene-vinyl alcohol copolymer film is used for the gas barrier layer on the heat source side. Compared to the case where the gas barrier layer has been used, the deterioration of the mechanical strength of the gas barrier layer is small even at a high temperature, and the shock resistance from inside or outside the vacuum heat insulating material can be improved.

  The invention of a vacuum heat insulating material according to claim 9 of the present invention is the invention according to any one of claims 5 to 8, wherein the heat-welded layer of the jacket material is a non-stretched polypropylene film. Yes, it also has a higher melting point than common high density polyethylene films and low density polyethylene films, so it can be used up to higher temperatures.

  According to a tenth aspect of the present invention, there is provided the vacuum heat insulating material according to any one of the first to ninth aspects, wherein the resin film of the outer layer of the jacket material is made of a fluororesin or an imide resin. These films have a higher or no melting point and also have flame retardancy.

  The invention of a vacuum heat insulating material according to claim 11 of the present invention is the invention according to any one of claims 1 to 10, wherein at least the outermost protective layer of the jacket material is VTM-compliant according to UL94 standard. It is a flame-retardant film comprising at least two flame-retardant films, and a flame-retardant member provided so as to cover the entire end surface of the jacket material, wherein the outermost layer is covered with the flame-retardant film. In addition, the entire outer surface of the vacuum heat insulating material is made to be flame-retardant by being covered with the flame-retardant member up to the cross-sectional portion of the non-flame-retardant film such as the heat welding layer slightly exposed at the end face of the outer cover material. Therefore, safety when using the vacuum heat insulating material can be improved.

  According to a twelfth aspect of the present invention, there is provided an apparatus according to the present invention, wherein a heating element having a temperature of more than 100 ° C., a protected member which is adversely affected by the temperature of the heating element, and a thermal effect from the heating element are provided. And a heat insulating member for shutting off the heat effect of the heating element, wherein the heat insulating member is the vacuum heat insulating material according to any one of claims 1 to 11. Therefore, it is possible to effectively eliminate the adverse effects of heat in a thin space without arranging a thick heat insulating material, providing a structurally large space, and further providing an air passage and blowing air. .

  The invention of an apparatus according to claim 13 of the present invention has a heat-insulated part heated to more than 100 ° C. in the main body or the inside of the main body, and a heat insulating member for maintaining the temperature state of the heat-insulated part. The heat insulating member is the vacuum heat insulating material according to any one of claims 1 to 11, wherein the heat insulating member is a thick heat insulating member for keeping the heated portion heated to a high temperature. Heat can be effectively kept in a thin space without arranging materials or consuming large amounts of energy due to frequent heating control.

  According to a fourteenth aspect of the present invention, there is provided the apparatus according to the twelfth aspect, wherein the main body is a printing device, and a fixing device having a heating and fixing means inside the main body; And a control device for controlling printing, the fixing device being provided at least in the vicinity of an outer periphery of the fixing device or the toner containing portion or the control device. And a vacuum heat insulating material that blocks thermal effects on the toner container or the control device.

  The vacuum heat insulating material according to any one of claims 1 to 11 has a predetermined heat resistance, and can be used as a heat insulating member of a fixing device at about 150 ° C. The deterioration is small, and the heat insulation performance can be maintained for a long time. As a result, heat from the fixing device is cut off, and therefore, a transfer device for transferring toner, such as a toner container or a photosensitive drum, around the fixing device, and a component that is easily affected by external heat such as a control device. It is possible to arrange the printer and the device in close proximity to each other, which can contribute to miniaturization and quality improvement of a printing device using the fixing device.

  According to a fifteenth aspect of the present invention, in the thirteenth aspect, the main body is a fixing device provided inside the printing apparatus for fusing and fixing the toner on the recording paper. The apparatus includes a heat fixing roller heated by a heating unit, a pressure roller for pressing the recording paper against the heat fixing roller, and at least a vacuum for heat retention disposed so as to surround the heat fixing roller or the pressure roller. And a heat insulating material.

  The vacuum heat insulating material according to any one of claims 1 to 11 has a predetermined heat resistance, and is a heat insulating member provided so as to surround the heat fixing roller at approximately 200 ° C. Of these, if it is placed on the outer part where the temperature has dropped to about 150 ° C, or if it is placed so as to surround the pressure roller at about 120 ° C, the heat-welded part of the vacuum heat insulating material will not deteriorate much, Can be maintained. Thereby, the temperature of the heat fixing roller and the pressure roller can be stably maintained by the thin heat insulating material, and energy for heating the heat fixing roller can be reduced, and the size and quality of the printing apparatus can be reduced. This can contribute to shortening the time for starting up the device and saving energy.

  According to a sixteenth aspect of the present invention, in the twelfth aspect of the present invention, the main body is a notebook personal computer, and a printed circuit board is provided inside the main body, a CPU on the printed circuit board, a keyboard, and a built-in accessory. Equipment, at least between the CPU and the bottom surface of the notebook personal computer, between the CPU and the keyboard, or between the CPU and the attached built-in device, the thermal influence from the CPU. It has a vacuum heat insulating material to shut off.

  Vacuum insulation material can exhibit sufficient heat insulation performance even at a thin thickness that was not useful with conventional heat insulation materials, and also has heat resistance and flame retardancy, such as inside a notebook computer, for example. Like other precision parts inside a personal computer, it can be used in a narrow space for a long time while ensuring safety. As a result, it is possible to prevent a heating element such as a CPU inside an electronic device including a notebook personal computer from adversely affecting other components. Giving or the like can be prevented for a long time while ensuring safety.

  In a device according to a seventeenth aspect of the present invention, in the invention according to the thirteenth aspect, the main body is a hot water supply device, and a hot water storage container is provided inside the main body, a water heater close to the hot water storage container, and the hot water storage container is enclosed. And a vacuum heat insulating material disposed at least in a portion close to the water heater.

  The temperature around the side surface of the hot water storage container is 100 ° C. at most, which is the temperature of the boiling water, and a vacuum heat insulating material has been conventionally used, but it cannot be applied to the bottom surface where the water heater is provided. The vacuum heat insulating material according to any one of claims 1 to 11 has a predetermined heat resistance. If the vacuum heat insulating material is disposed so as not to exceed 150 ° C. even in the vicinity of the water heater, the hot water is hardly cooled. Power consumption can be reduced, the volume below the hot water storage container can be reduced, and the size of the hot water supply device can be reduced.

  Hereinafter, embodiments of a vacuum heat insulating material according to the present invention will be described with reference to the drawings.

(Embodiment 1)
FIG. 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 main-portion cross-sectional view showing a fin portion of the vacuum heat insulating material.

  1 and 2, a vacuum heat insulating material 1 is a material in which a core material 3 is covered with two covering materials 2 facing each other, the inside is reduced to a vacuum, and the surroundings are sealed by heat welding.

  The jacket material 2 uses two types of laminated films 2a and 2b in combination, and heat-seal layers 4a and 4b, gas barrier layers 5a and 5b, first protective layers 6a and 6b, and a second protective layer 7a from inside, respectively. , 7b, and each of the films has a flame resistance of at least UL94 standard VTM-2 or more.

  The laminated film 2a is used as the high temperature side of the heat insulating surface, and the heat welding layer 4a has a melting point of 210 ° C. and polychlorotrifluoroethylene (thickness: 50 μm), and the gas barrier layer 5a has a thickness considering that it is disposed on the high temperature side. An aluminum foil having a thickness of 6 μm, and the second protective layer 7 a was made of tetrafluoroethylene-ethylene copolymer (thickness: 25 μm) having a melting point of 260 ° C. Polychlorotrifluoroethylene has a low melting point and is easy to use among fluorine resin films, and also has excellent gas barrier properties.

  The laminated film 2b is used as the low-temperature side of the heat insulating surface, and the heat-sealing layer 4b has the same polychlorotrifluoroethylene (50 μm thickness) as the laminated film 2a, and the gas barrier layer 5b has a polyethylene naphthalate film (12 μm thickness). One of metal, metal oxide, and silica is deposited, and a film coated with acrylic acid or a polyethylene naphthalate film (thickness: 12 μm) is coated with acrylic acid. A film on which one of a metal, a metal oxide and silica is deposited, and a first protective layer 6b having polyethylene naphthalate (aluminum deposited to a thickness of 500 [deg.]) Inside to enhance gas barrier properties. The second protective layer 7b is made of ethylene tetrafluoride-ethylene having a melting point of 260 ° C. And the copolymer (thickness 25 [mu] m).

  In manufacturing the vacuum heat insulating material 1, three sides are heat-welded with the laminated films 2a and 2b facing each other to prepare a bag for inserting a core material.

  The core material 3 is a material in which carbon black having a powder specific resistance of 0.6 cm / Ω is uniformly dispersed and filled in fumed silica having an average primary particle diameter of 7 nm. The amount of carbon black added was 5 wt%.

The core material 3 is inserted into a bag of the jacket material 2 together with calcium oxide as a moisture adsorbent, the inside is reduced to 10 Pa, the other side is sealed by heat welding, and the vacuum heat insulating material 1 having a thickness of 6 mm is formed. Was prepared.

  When the thermal conductivity of the vacuum heat insulating material 1 using these materials was measured, it was 0.0044 W / mK. When the thermal conductivity was measured after performing an acceleration test in which it was assumed that the vacuum heat insulating material 1 was left in an atmosphere at 150 ° C. for 5 years, the gas barrier layer 5b on the low temperature side was made of polyethylene in which aluminum was vapor-deposited to a thickness of 500 °. The reduction was 0.0010 W / mK as compared with the case of naphthalate (thickness: 12 μm).

  In this method, one of metal, metal oxide, and silica is deposited on a polyethylene naphthalate film as a gas barrier layer, and acrylic acid is coated thereon. An acid coating is applied, and one of a metal, a metal oxide and silica is deposited thereon. The gas barrier layer has a maximum continuous use temperature of 160 ° C. specified in UL746B. Polyethylene terephthalate, which has a heat resistance of 200 ° C. or higher because of the heat resistance of vapor deposition and acrylic acid coating.Polyethylene terephthalate has a vapor deposition layer and an acrylic acid coating layer treated for the purpose of improving gas barrier properties. Gas barrier properties are dramatically improved This is because it is possible to further improve the gas barrier property by using the temperature side.

  Regarding the gas barrier property of acrylic acid coating, the acrylic resin coating is applied to the ethylene-polyvinyl alcohol copolymer resin film and the polyethylene terephthalate film coated with acrylic acid, which have good gas barrier properties among the resin films. The resulting film has a better gas permeability of 1/2 or less.

  In addition, when the flammability was confirmed based on a combustion test of a plastic material for parts of a UL94 safety standard device, a result equivalent to V-0 was obtained even at the fin end face.

  As described above, even in a high-temperature atmosphere at 150 ° C., a decrease in the gas barrier property of the thermal welding layer can be suppressed to a small extent, so that the thermal conductivity does not deteriorate much, and the heat insulating performance of the vacuum heat insulating material can be maintained for a long time. Further, flame retardancy can be imparted as the jacket material 2 having a laminate structure and further as the vacuum heat insulating material 1, and safety when using the vacuum heat insulating material can be improved.

  In addition, since the acrylic acid coating has very good bending resistance, the effect of increasing the amount of gas penetration due to bending of the fin portion and suppressing the generation of pinholes can be obtained. Further, since the acrylic acid coating is hard to be peeled off, it is possible to obtain an effect of protecting the deposited layer by forming it on the deposited layer.

  The above-mentioned acrylic acid coating is a coating material manufactured by Kureha Chemical Industry, and a film obtained by coating a resin film such as polyethylene terephthalate with the above-mentioned acrylic acid is called Besera.

  The resin film used for the heat welding layers 4a and 4b is not particularly specified as long as the resin film has a melting point of 200 ° C. or higher and can be heat welded. For example, polychlorotrifluoride having a melting point of 210 ° C., which is a fluororesin film, tetrafluoroethylene-ethylene copolymer having a melting point of 260 ° C., and tetrafluoroethylene-6-fluoropropylene copolymer having a melting point of 285 ° C. desirable.

  The gas barrier layer 5a has a higher melting point than the films used for the heat-sealing layers 4a and 4b, and is specifically designated as a metal foil, a metal-deposited or inorganic oxide-deposited film, or a resin film as long as it has a high gas barrier property. Not something.

  For example, aluminum foil is often used as a metal foil, and iron, nickel, platinum, tin, titanium, stainless steel, and carbon steel can be used as a metal having a small amount of heat flowing through the metal foil around the vacuum heat insulating material. . As the material for metal deposition, aluminum, cobalt, nickel, zinc, copper, silver, or a mixture thereof can be used, and as the material for inorganic oxide deposition, silica, alumina, or the like can be used.

  The base material of the gas barrier layer 5a may be a polyphenylene sulfide film.

  As the gas barrier layer 5a, an aramid-based film having a glass transition point of 270 ° C. (thickness: 12 μm) obtained by evaporating aluminum to a thickness of 500 ° may be used. When an aramid-based film having a glass transition temperature of 270 ° C. and excellent gas barrier properties even at a high temperature is used as the base material of the film on which the gas barrier layer 5a on the high-temperature side is deposited, the gas barrier layer is heated to a heat source of about 150 ° C. Even if the surface of the vapor-deposited film is mounted, gas infiltration into the inside of the vacuum heat insulating material can be reduced, and the heat insulating performance can be maintained. Therefore, a decrease in the heat insulation performance due to heat transmitted through the metal can be suppressed, and the heat insulation performance can be maintained even at a high temperature of about 150 ° C.

  In addition, since a long-term heat-resistant temperature of UL746B calculated from the half-life of mechanical properties of the aramid-based film is used for the gas barrier layer, a conventional ethylene-vinyl alcohol copolymer film is used for the gas barrier layer on the heat source side. Compared to the case where the gas barrier layer has been used, the deterioration of the mechanical strength of the gas barrier layer is small even at a high temperature, and the shock resistance from inside or outside the vacuum heat insulating material can be improved. As a method of further improving the impact resistance from the inside of the vacuum heat insulating material, for example, there is a method of further adding a layer of polyethylene naphthalate or the like between the heat welding layer and the gas barrier layer.

  Further, the protective layers 6a, 6b, 7a, 7b may be films having a melting point higher than that of the films used for the heat welding layers 4a, 4b. Specifically, the heat melting layers 4a, 4b have a melting point of 260 ° C. When using a tetrafluoroethylene-ethylene copolymer, a tetrafluoroethylene-perfluoroalkoxyethylene copolymer having a melting point of 310 ° C., a tetrafluoroethylene having a melting point of 330 ° C., and a polyether having a melting point of 330 ° C. Ketones and the like can be used, and polysulfone and polyetherimide can also be used.

  As the core material 3, inorganic and organic powder materials, inorganic and organic fiber materials, and the like can be used and are not particularly specified. Examples of the powder materials include agglomerated silica powder, expanded pearlite powder, diatomaceous earth powder, and silicate. Inorganic powders such as calcium powder, calcium carbonate powder, clay and talc can be used. As the fiber material, inorganic fibers such as glass wool and ceramic fiber are preferable. Among them, inorganic powders having a secondary aggregated particle diameter of 20 μm or less are desirable, and since these powder materials are very fine particles, the contact thermal resistance between the particles increases, the solid thermal conductivity decreases, and the pressure under a pressure of 10 Torr or less Shows a very small thermal conductivity regardless of pressure. Therefore, it is an optimal material for use under high temperature conditions where the motion of air molecules is large.

(Embodiment 2)
FIG. 3 is a cross-sectional view of the vacuum heat insulating material according to Embodiment 2 of the present invention, showing a state where the vacuum heat insulating material is in contact with a heating element that is a high-temperature portion.

  In FIG. 3, a jacket material 9 of the vacuum heat insulating material 8 is a non-stretched polypropylene film having a melting point of 160 ° C. as compared with the structure of the first embodiment, and the gas barrier layer 5a Any one of metal, metal oxide and silica is deposited on a polyethylene naphthalate film (thickness 12 μm), and then a film coated with acrylic acid or a polyethylene naphthalate film (thickness 12 μm) is formed. A film coated with acrylic acid, on which one of metal, metal oxide, and silica is deposited, and a gas barrier layer 5b is a film obtained by performing aluminum deposition on an ethylene-vinyl alcohol copolymer film. A fin portion 12 composed of an adhesive portion 10 in which the core material 3 does not exist inside the jacket material 9 and a heat-welded portion 11 Is bent along the low-temperature heat-insulating surface 8b opposite to the high-temperature heating element 13 to protect the heat-welded portion 11. The configurations of the protective layer of the jacket material 9 and the core material 3 are the same as in the first embodiment.

  Here, even when the temperature of the heating element 13 was set to 150 ° C., the temperature of the heat-welded portion 11 along the low-temperature-side heat insulating surface 8b could be maintained at 80 ° C. or less. That is, even if a conventional inexpensive resin film having a melting point of less than 200 ° C. is used without using a resin film having a melting point of 200 ° C. or more for the heat-welding layer, the resin does not deteriorate, It is possible to insulate from the heating element 13 at 150 ° C. without lowering the heat insulating performance of the vacuum heat insulating material. At this time, the gas barrier layer 5a is formed by depositing one of metal, metal oxide, and silica on a polyethylene naphthalate film (thickness: 12 μm), and then coating the gas barrier layer with acrylic acid. A polyethylene naphthalate film (thickness: 12 μm) is coated with acrylic acid, and one of metal, metal oxide, and silica is deposited on the film. Polyethylene terephthalate with a maximum operating temperature of 160 ° C. The heat resistance of vapor deposition and acrylic acid coating is 200 ° C or higher, so it has excellent heat resistance. Gas barrier properties are dramatically improved because of the acid coating layer , Can be used instead of metal foil.

  As a result, heat leak, which has been a problem with metal foil, can be reduced. In addition, since the acrylic acid coating has very good bending resistance, the effect of increasing the amount of gas penetration due to bending of the fin portion and suppressing the generation of pinholes can be obtained. Further, since the acrylic acid coating is hard to be peeled off, it is possible to obtain an effect of protecting the deposited layer by forming it on the deposited layer.

  At this time, as the film having a melting point of less than 200 ° C., there is no problem even if an unstretched polypropylene film, a high-density polyethylene film, a linear low-density polyethylene film, and an ethylene-vinyl alcohol copolymer film are used. In addition, it is possible to prevent infiltration of air and water vapor into the inside of the vacuum heat insulating material for a long period of time with a jacket material made of an inexpensive material, and to maintain heat insulating performance.

(Embodiment 3)
FIG. 4 is a plan view of a vacuum heat insulating material according to Embodiment 3 of the present invention.

  In FIG. 4, the structure of the vacuum heat insulating material 8 is the same as that of the second embodiment, and is fixed with the flame-retardant tape 14 so as to keep the fin 12 bent. At this time, a flame-retardant tape 14 was attached so as to completely cover the tip of the fin 12 so that the end face of the jacket material 9 was not exposed.

  The thermal conductivity of this vacuum heat insulating material 8 was 0.0049 W / mK when measured. The thermal conductivity of this vacuum heat insulating material 8 after performing an acceleration test, which is expected to be left in an atmosphere at 150 ° C. for 5 years, was measured and found to be 0.0125 W / mK.

  In addition, when the flammability was confirmed based on a combustion test of a plastic material for a part of a UL94 safety standard device, a result equivalent to V-0 was obtained.

  That is, since a non-flame-retardant film such as a non-stretched polypropylene film constituting a heat-welded layer exposed at the end face of the jacket material 9 is covered with the flame-retardant tape 14, the flame-retardant property is imparted also as a vacuum heat insulating material. can do. Therefore, safety when using the vacuum heat insulating material can be improved.

(Embodiment 4)
FIG. 5 is a sectional view of a printing apparatus according to Embodiment 4 of the present invention.

  In printing on the recording paper 17 in the printing device 16 having the fixing device 15, an electrostatic image is formed on the surface of the photosensitive drum 18, and the toner is adsorbed from the toner accommodating portion 19 to the photosensitive drum 18 via the transfer drum 20. The image is transferred to the recording paper 17. The recording paper 17 to which the toner image has been transferred is carried into the fixing device 15, and the toner is melted and fixed by passing the recording paper 17 between the heat fixing roller 21 and the pressure roller 22 kept at a high temperature.

  A vacuum insulating material 23a for keeping heat is provided around the heat fixing roller 21 and the pressure roller 22 in order to keep a predetermined high temperature. Further, on the outer frame of the fixing device 15, a vacuum insulating material for insulation 23b is arranged on the entire side surface and the upper surface so as not to affect the surroundings. For blocking, it may be provided like a vacuum heat insulating material 23c. These vacuum heat insulating materials 23a, 23b, and 23c were configured as shown in the first embodiment of the present invention, and the fin portions were used by being bent to the side opposite to the heat fixing roller 21.

  As a result, the print quality was improved, and the control device (not shown) and the transfer devices such as the toner storage unit 19 and the photosensitive drum 18 could be maintained at 45 ° C. or less for a long period of time without adversely affecting the toner. .

  In addition, the vacuum heat insulating material according to the present invention can be used not only for a fixing device of a copying machine or a laser printer as a printing device, but also for a product that needs to insulate a heating element of 150 ° C. or lower or keep the same temperature. Can be used.

(Embodiment 5)
FIG. 6 is a sectional view of a notebook personal computer according to Embodiment 5 of the present invention.

In FIG. 6, a notebook computer 24 has a printed circuit board 25 in a main body, and a CPU 26 and other chips are mounted thereon. The cooling device 27 of the CPU 26 includes a heat transfer block 28 in contact with the CPU 26 and a heat pipe 29 for transferring heat. The heat radiating plate 30 diffuses the internal heat and transmits the heat to the bottom surface 31 of the personal computer. The vacuum heat insulating material 32 has a flame retardancy of 2 mm in thickness in the structure shown in the first embodiment, and has an adhesive on the inside of the personal computer bottom surface 31 just below the CPU 26 and on the back surface of the keyboard 33 just above the CPU 26. It is attached closely.

  As a result, it was possible to lower the temperature by a maximum of 6 ° C. in the high-temperature portion of the personal computer bottom surface 31 and the surface of the keyboard 33 just above the CPU 26. That is, it is possible to prevent a part of the surface of the personal computer from being abnormally heated and giving the user discomfort for a long time while improving the safety of the notebook personal computer 24.

  The vacuum heat insulating material of the present invention can be used to insulate and protect a hard disk device and the like built in a notebook computer from high temperatures. It can be similarly used in equipment and the like.

(Embodiment 6)
FIG. 7 is a sectional view of an electric water heater according to Embodiment 6 of the present invention.

  In FIG. 7, an electric water heater 34 has a hot water storage container 35 for boiling and storing hot water inside the main body, and has an upper cover that can be opened and closed at an upper portion.

  A doughnut-shaped heater 37 is closely attached to the bottom surface of the hot water storage container 35, and the control device 38 receives a signal from a temperature detector 39 and controls the heater 37 to maintain a predetermined temperature. Further, a hot water outlet 44, which is a hot water outlet, communicates with a hot water outlet 44 via a pump 42 driven by a motor 41 from a suction port 40 also provided on the bottom surface. This is done by starting.

  Further, a vacuum heat insulating material 46 is wound around the side surface of the hot water storage container 35, and a high-temperature vacuum heat insulating material 47 is also provided outside the heater 37 on the bottom surface. The decline is suppressed. The vacuum heat insulating material 46 on the side surface has been conventionally provided in a structure capable of withstanding 100 ° C., and the vacuum heat insulating material 47 on the bottom surface is a newly provided material having the structure shown in the third embodiment. is there.

  Conventionally, by insulating the place where the heat insulating material could not be arranged due to high temperature, the power consumption was reduced by about 3%, and the performance was maintained for a long time. In addition, there is no need to provide a space on the bottom surface of the main body to provide heat insulation, so that the volume below the hot water storage container can be reduced, and the water heater can be downsized.

  The vacuum heat insulating material of the present invention can suppress a decrease in gas barrier properties even in a high-temperature atmosphere of about 150 ° C., and can maintain the heat insulating performance of the vacuum heat insulating material for a long time. The present invention can be applied to heat insulation and heat insulation of electronic devices such as printing devices and computers, and further, devices having a high temperature portion such as hot water supply devices.

Sectional view of vacuum heat insulating material according to Embodiment 1 of the present invention. Principal part cross-sectional view showing a fin portion of the vacuum heat insulating material according to Embodiment 1 of the present invention. Partial sectional view of a vacuum heat insulating material according to Embodiment 2 of the present invention. Plan view of vacuum heat insulating material according to Embodiment 3 of the present invention Sectional view of a printing apparatus according to Embodiment 4 of the present invention. Sectional view of notebook personal computer according to Embodiment 5 of the present invention. Sectional view of an electric water heater according to Embodiment 6 of the present invention.

Explanation of reference numerals

DESCRIPTION OF SYMBOLS 1 Vacuum heat insulating material 2 Outer cover material 2a, 2b Laminated film 3 Core material 4a, 4b Heat welding layer 5a, 5b Gas barrier layer 6a, 6b First protective layer 7a, 7b Second protective layer 8 Vacuum heat insulating material 8b Low temperature side Insulating surface 9 Jacket material 10 Adhesive part 11 Heat welding part 12 Fin part 13 Heating element 14 Flame retardant tape 15 Fixing device 16 Printing device 17 Recording paper 18 Photosensitive drum 19 Toner storage unit 20 Transfer drum 21 Heat fixing roller 22 Pressurization Rollers 23a, 23b, 23c Vacuum insulation material 24 Notebook PC 25 Printed circuit board 26 CPU
32 Vacuum insulation material 33 Keyboard 34 Electric water heater 35 Hot water storage container 37 Heater 46, 47 Vacuum insulation material

Claims (17)

  A core material, comprising a jacket material having a laminate structure having a heat-welding layer, a gas barrier layer, and a protective layer, wherein the heat-welding layer is made of a resin film having a melting point of 200 ° C. or more, and the resin of the gas barrier layer and the protective layer A vacuum heat insulating material, wherein the melting point of the film is higher than the melting point of the resin film of the heat welding layer.   The vacuum heat insulating material according to claim 1, wherein the heat-sealing layer, the gas barrier layer, and the protective layer of the jacket material are flame-retardant films of VTM-2 or more in UL94 standard.   3. The vacuum heat insulating material according to claim 1, wherein the heat welding layer is a fluorine resin film.   The vacuum heat insulating material according to any one of claims 1 to 3, wherein the heat welding layer is a polychlorotrifluoroethylene film.   A core material, comprising a jacket material having a laminated structure having a heat welding layer, a gas barrier layer, and a protective layer, wherein the heat welding layer is made of a resin film having a melting point of less than 200 ° C, and the protective layer having a melting point of 200 ° C or more. It is made of a film, and the fin portion of the jacket material formed when the core material is covered with the jacket material and the inside is decompressed and the core material is sealed by heat welding, Vacuum insulation characterized by being bent to the low temperature side.   The gas barrier layer is formed by depositing one of a metal, a metal oxide, and silica on a polyethylene naphthalate film, and coating an acrylic acid thereon. 6. The vacuum heat insulating material according to claim 5,   The gas barrier layer is formed by coating a polyethylene naphthalate film with acrylic acid, and then depositing one of a metal, a metal oxide, and silica on the polyethylene naphthalate film. 6. The vacuum heat insulating material according to claim 5,   The vacuum heat insulating material according to any one of claims 1 to 5, wherein the gas barrier layer on at least one surface is a film formed by depositing any of metal, metal oxide, and silica on an aramid film.   The vacuum heat insulating material according to any one of claims 5 to 8, wherein the heat welding layer is an unstretched polypropylene film.   The vacuum heat insulating material according to any one of claims 1 to 9, wherein the protective layer is a film of a fluorine-based resin or an imide-based resin.   At least the outermost protective layer of the jacket material is a flame-retardant film of VTM-2 or more in UL94 standard, and a flame-retardant member is provided so as to cover the entire end surface of the jacket material. The vacuum heat insulating material according to any one of claims 1 to 10.   A heating element having a temperature higher than 100 ° C., a protected member which is adversely affected by the temperature of the heating element, and a heat insulating member for blocking heat influence from the heating element; An apparatus using the vacuum heat insulating material, which is the vacuum heat insulating material according to any one of items 1 to 11.   A body or a heat-insulated part heated to more than 100 ° C. inside the body, and a heat insulating member for maintaining a temperature state of the heat-insulated part, wherein the heat insulating member is one of claims 1 to 11. An apparatus using the vacuum heat insulating material, which is the vacuum heat insulating material according to any one of the preceding claims.   The main body is a printing device, a fixing device having a heating and fixing unit inside the main body, a toner storage unit for storing toner fused and fixed on recording paper by the fixing device, and a transfer device for transferring toner to recording paper. And a control device for controlling printing, provided at least in the vicinity of the outer periphery of any one of the fixing device or the toner storage portion or the control device, and provided from the fixing device to the toner storage portion or the control device. The apparatus using the vacuum heat insulating material according to claim 12, further comprising a vacuum heat insulating material that blocks a thermal influence on the device.   The main body is a fixing device provided inside the printing device for fusing and fixing the toner on the recording paper.The fixing device includes a heat fixing roller heated by a heating unit, and a recording paper on the heat fixing roller. 14. The vacuum heat insulating material according to claim 13, comprising a pressure roller to be pressed and at least a heat insulating vacuum heat insulating material disposed so as to surround the heat fixing roller or the pressure roller. machine.   The main body is a notebook computer, which includes a printed circuit board, a CPU on the printed circuit board, a keyboard, and attached built-in devices inside the main body, at least between the CPU and the bottom surface of the housing, or the CPU. 13. The vacuum heat insulating material according to claim 12, further comprising a vacuum heat insulating material for blocking heat influence from the CPU, either between the CPU and the keyboard or between the CPU and the attached built-in device. Equipment.   The main body is a hot water supply device, including a hot water storage container inside the main body, a water heater close to the hot water storage container, and a heat insulating material arranged to wrap the hot water storage container, and a vacuum heat insulating material at least at a portion close to the hot water heater. 14. An apparatus using the vacuum heat insulating material according to claim 13, wherein:

Images