JP2005114014A - Vacuum heat insulating material and instrument using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vacuum heat insulating material capable of maintaining heat insulating performance over a long time even in a high-temperature range of 150°C or more by changing an adhesive between coating material films. <P>SOLUTION: As the adhesive between the coating material films, a polyester group, an epoxy group and a silicone group adhesives having 160°C or more of heat resistance are used. Even in the high-temperature atmosphere at about 150°C, the generation of peeling and de-lamination between the coating material films can be prevented by using these adhesives, and heat insulating performance can be maintained over a long time. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a vacuum heat insulating material and a device using the vacuum heat insulating material, and more particularly to heat insulation and heat insulation of a printing apparatus such as a copying machine or a laser printer, and further a hot water supply device such as a device having a high temperature part. .

  The vacuum heat insulating material is a heat insulating material in which the thermal conductivity of the gas is remarkably reduced by putting the foamed resin, powder, fiber material or the like into the outer cover material as a core material and making the inner surface of the outer cover material vacuum. 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.

  Some of these vacuum heat insulating materials are provided on the outer periphery of a water storage container of an electric water heater, which is a household electric appliance, to insulate them, thereby reducing heat insulation power. In the gas barrier layer in the laminated film constituting the vacuum heat insulating material, a metal foil is used on the side exposed to high temperature, and a vapor deposition layer is used on the low temperature side, and the gas barrier property at a temperature of about 100 ° C. on the high temperature side. Is good and can maintain a vacuum state, heat insulation can be maintained for a long time, and by using a vapor deposition layer on the low temperature side, heat flowing through the metal foil can be suppressed, and the heat insulation performance of the entire vacuum heat insulating material can be reduced. This is an improvement (see, for example, Patent Document 1).

On the other hand, the conventional vacuum heat insulating material comprising a general resin film as an outer covering material can only be used up to 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 Are used to provide an outer frame portion having a fixing portion such as a fixing roller and a paper discharge roller (see, for example, Patent Document 2).
JP 2001-8828 A JP-A-57-155570

  However, one of the reasons why the conventional vacuum heat insulating material cannot be used at a high temperature is that a two-component curable urethane adhesive is used for bonding between the covering material films. When the temperature at the site of use was 100 ° C or less, as in an electric water heater, the heat insulation performance could be maintained for a long period of time. However, the electric water heater also has a heater at the bottom of the hot water storage container. When the temperature of the part to be used is about 150 ° C., such as a fixing part used in a copying machine or a laser printer, there is a possibility that peeling or delamination may occur between the covering material films. The degree of vacuum gradually decreases, and there is a possibility that the predetermined heat insulation performance cannot be maintained over a long period of time.

  In addition, the conventional vacuum insulation material uses nylon film for the outermost layer of the jacket material because of its flexibility and low cost, and has no flame retardant properties. Like the above parts, the vacuum insulation was also required to be flame retardant. In particular, when it is arranged in a small space such as inside a notebook personal computer, even a vacuum insulation material with a reduced thickness is in close proximity to the precision components inside the personal computer, so flame retardancy is required.

  An object of this invention is to provide the vacuum heat insulating material which can maintain heat insulation performance over a long period of time also in the high temperature area | region of 150 degreeC or more by changing the adhesive agent between cover material films. .

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

  In order to solve the above-mentioned problems, the present invention includes a core material, and a jacket material having a laminate structure having a heat welding layer, a gas barrier layer, and a protective layer, and the heat welding layer is made of a resin film having a melting point of 200 ° C. or higher. 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, and the adhesive between the films is an acrylic or polyester adhesive. It is a vacuum insulation material.

  Since the acrylic or polyester adhesive has a heat resistance of about 160 ° C., it reduces the possibility of peeling or delamination between the covering material films even in a high temperature atmosphere of about 150 ° C. Therefore, predetermined heat insulation performance can be maintained for a considerable period even in an atmosphere of 150 ° C. Moreover, since the adhesive strength between films increases, mechanical strength such as tensile strength and puncture strength as a laminate film also increases, and impact resistance from inside or outside the vacuum heat insulating material can be improved.

  Also, assuming that the ambient temperature at which the vacuum heat insulating material can be used is 50K lower than the melting point of the film of the heat-welded layer, the deterioration of the gas barrier property is reduced even in a high temperature atmosphere of about 150 ° C if the film has a melting point of 200 ° C or higher. The heat insulation performance of the vacuum heat insulating material can be maintained for a long period of time, and a film having a melting point higher than that of the heat welding layer is used for the gas barrier layer and the protective layer. A vacuum heat insulating material can be produced without any problem even when welding.

  According to the present invention, since the acrylic or polyester adhesive has a heat resistance of about 160 ° C., it reduces the possibility of peeling or delamination between the outer cover material films even in a high temperature atmosphere of about 150 ° C. . Therefore, a decrease in heat insulation performance due to gas intrusion can be reduced, and predetermined heat insulation performance can be maintained for a considerable period even in an atmosphere at 150 ° C. Moreover, since the adhesive strength between films increases, mechanical strength such as tensile strength and puncture strength as a laminate film also increases, and impact resistance from inside or outside the vacuum heat insulating material can be improved. In addition, since it is made of a film having a melting point of 200 ° C. or higher, it is possible to suppress a decrease in gas barrier properties even in a high temperature atmosphere of about 150 ° C., and to maintain the heat insulating performance of the vacuum heat insulating material for a long period of time. Since a film having a melting point higher than that of the film of the heat welding layer is used for the layer, a vacuum heat insulating material can be produced without any problem even when the jacket material is heat welded.

A core material, and a cover 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 for the gas barrier layer and the protective layer The vacuum heat insulating material is characterized in that the melting point of the film is higher than the melting point of the resin film of the heat welding layer, and the adhesive between the films is an acrylic or polyester adhesive.

  Since the acrylic or polyester adhesive has a heat resistance of about 160 ° C., it reduces the possibility of peeling or delamination between the covering material films even in a high temperature atmosphere of about 150 ° C. Therefore, a decrease in heat insulation performance due to gas intrusion can be reduced, and predetermined heat insulation performance can be maintained for a considerable period even in an atmosphere at 150 ° C. Moreover, since the adhesive strength between films increases, mechanical strength such as tensile strength and puncture strength as a laminate film also increases, and impact resistance from inside or outside the vacuum heat insulating material can be improved.

  Also, assuming that the ambient temperature at which the vacuum heat insulating material can be used is 50K lower than the melting point of the film of the heat-welded layer, the deterioration of the gas barrier property is reduced even in a high temperature atmosphere of about 150 ° C if the film has a melting point of 200 ° C or higher. The heat insulation performance of the vacuum heat insulating material can be maintained for a long period of time, and a film having a melting point higher than that of the heat welding layer is used for the gas barrier layer and the protective layer. A vacuum heat insulating material can be produced without any problem even when welding.

  The invention described in claim 2 of the present invention comprises a core material, and a jacket material having a laminate structure having a heat welding layer, a gas barrier layer, and a protective layer, and the heat welding layer is a resin film having a melting point of 200 ° C. or higher. The gas barrier layer and the protective layer have a melting point higher than the melting point of the resin film of the heat welding layer, and the adhesive between the films is an epoxy-based adhesive. It is a material.

  Since the epoxy adhesive has a heat resistance of about 200 ° C., even in a high temperature atmosphere of about 150 ° C., the possibility of peeling or delamination between the outer cover material films is further reduced than in the case of claim 1. Therefore, it is possible to reduce a decrease in heat insulation performance due to gas intrusion and maintain a predetermined heat insulation performance for a longer period even in a 150 ° C. atmosphere. Further, since the adhesive strength between the films is increased, the mechanical strength such as the tensile strength and the piercing strength as the laminate film is also increased, and the impact resistance from inside or outside the vacuum heat insulating material is further improved as compared with the case of claim 1. be able to.

  The invention according to claim 3 of the present invention includes a core material, and a jacket material having a laminate structure having a heat welding layer, a gas barrier layer, and a protective layer, and the heat welding layer is a resin film having a melting point of 200 ° C. or higher. The gas barrier layer and the protective layer have a melting point higher than that of the resin film of the heat welding layer, and the adhesive between the films is a silicon-based adhesive. It is a material.

  Since the silicon-based adhesive has a heat resistance of about 250 ° C., even in a high temperature atmosphere of about 150 ° C., the possibility of delamination or delamination between the covering material films is further increased than in the case of claims 1 and 2. Decrease. Therefore, a decrease in heat insulation performance due to gas intrusion can be reduced, and the predetermined heat insulation performance can be maintained for about 10 years even in an atmosphere at 150 ° C. Further, since the adhesive strength between the films is increased, the mechanical strength such as tensile strength and piercing strength as the laminate film is also increased, and the impact resistance from the inside or outside of the vacuum heat insulating material is also in the case of claim 1 or claim 2. It can be further improved.

  The invention according to claim 4 of the present invention is characterized in that the heat-welded layer, the gas barrier layer, and the protective layer of the jacket material are at least a flame retardant film of VTM-2 or higher according to the UL94 standard. In the invention according to any one of claims 1 to 3, the jacket material having a laminate structure can be made flame retardant, and furthermore, flame retardant can be imparted as a vacuum heat insulating material. Therefore, the safety when using the vacuum heat insulating material can be improved.

  The invention according to claim 5 of the present invention is the invention according to any one of claims 1 to 4, wherein the heat-welded layer is a fluororesin film, and these films have a considerable melting point. High and flame retardant.

  The invention according to claim 6 of the present invention is the invention according to any one of claims 1 to 5, wherein the heat-welded layer is a polychlorotrifluoride ethylene film, Above all, it is easy to use and economical because of its low melting point.

  The invention according to claim 7 of the present invention comprises a core material, and a jacket material having a laminate structure having a heat-welding layer, a gas barrier layer, and a protective layer, and the heat-welding layer has a melting point of less than 200 ° C. And the protective layer is made of a film having a melting point of 200 ° C. or more, and is formed by covering the core material with the jacket material, reducing the inside, and sealing the periphery of the core material by heat welding. A vacuum heat insulating material in which a fin portion of a material is bent to a low temperature side of an opposing heat insulating surface, and an adhesive between films is an acrylic or polyester adhesive.

  Since the acrylic or polyester adhesive has a heat resistance of about 160 ° C., it reduces the possibility of peeling or delamination between the covering material films even in a high temperature atmosphere of about 150 ° C. Therefore, a decrease in heat insulation performance due to gas intrusion can be reduced, and predetermined heat insulation performance can be maintained for a considerable period even in an atmosphere at 150 ° C. Moreover, since the adhesive strength between films increases, mechanical strength such as tensile strength and puncture strength as a laminate film also increases, and impact resistance from inside or outside the vacuum heat insulating material can be improved.

  Moreover, since the fin part of a jacket material is bend | folded to the low temperature side of the heat insulation surface which opposes, in other words, the opposite side to a heat-emitting part, a heat welding part can be protected from high temperature. For example, even if the high temperature side surface of the vacuum heat insulating material reaches 150 ° C., the heat welded portion located on the low temperature side heat insulating surface can be maintained at 100 ° C. or lower. Therefore, it is not necessary to use a film having a melting point of 200 ° C. or higher for the heat-welded layer, and the vacuum heat insulating material can be configured with an inexpensive material.

  According to an eighth aspect of the present invention, there is provided a resin film having a core material, 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 has a melting point of less than 200 ° C. And the protective layer is made of a film having a melting point of 200 ° C. or more, and is formed by covering the core material with the jacket material, reducing the inside, and sealing the periphery of the core material by heat welding. A vacuum heat insulating material in which a fin portion of a material is bent to a low temperature side of an opposing heat insulating surface, and an adhesive between films is an epoxy-based heat insulating material.

  Since the epoxy-based adhesive has a heat resistance of about 200 ° C., the possibility of peeling or delamination between the outer coating films is further reduced even in a high temperature atmosphere of about 150 ° C. compared to the case of claim 7 of the present invention. Let Therefore, it is possible to reduce a decrease in heat insulation performance due to gas intrusion and maintain a predetermined heat insulation performance for a longer period even in a 150 ° C. atmosphere. Further, since the adhesive strength between the films is increased, the mechanical strength such as the tensile strength and the piercing strength as the laminate film is also increased, and the impact resistance from the inside or outside of the vacuum heat insulating material is also higher than that in the case of claim 7 of the present invention. Further improvement can be achieved.

  Moreover, since the fin part of a jacket material is bend | folded to the low temperature side of the heat insulation surface which opposes, in other words, the opposite side to a heat-emitting part, a heat welding part can be protected from high temperature. For example, even if the high temperature side surface of the vacuum heat insulating material reaches 150 ° C., the heat welded portion located on the low temperature side heat insulating surface can be maintained at 100 ° C. or lower. Therefore, it is not necessary to use a film having a melting point of 200 ° C. or higher for the heat-welded layer, and the vacuum heat insulating material can be configured with an inexpensive material.

  The invention according to claim 9 of the present invention includes a core material, and a jacket material having a laminate structure having a heat welding layer, a gas barrier layer, and a protective layer, and the heat welding layer has a melting point of less than 200 ° C. And the protective layer is made of a film having a melting point of 200 ° C. or more, and is formed by covering the core material with the jacket material, reducing the inside, and sealing the periphery of the core material by heat welding. A vacuum heat insulating material in which a fin portion of a material is bent to a low temperature side of an opposing heat insulating surface, and an adhesive between films is a silicon-based adhesive.

  Since the silicon-based adhesive has a heat resistance of about 250 ° C., the possibility of delamination or delamination between the outer coating films even in a high temperature atmosphere of about 150 ° C. is as set forth in claims 7 and 8 of the present invention. Decrease further than the case. Therefore, a decrease in heat insulation performance due to gas intrusion can be reduced, and the predetermined heat insulation performance can be maintained for about 10 years even in an atmosphere at 150 ° C. Further, since the adhesive strength between the films is increased, the mechanical strength such as the tensile strength and the piercing strength as the laminate film is also increased, and the impact resistance from the inside or the outside of the vacuum heat insulating material is also claimed in the present invention. This can be further improved as compared with the case of 8.

  Moreover, since the fin part of a jacket material is bend | folded to the low temperature side of the heat insulation surface which opposes, in other words, the opposite side to a heat-emitting part, a heat welding part can be protected from high temperature. For example, even if the high temperature side surface of the vacuum heat insulating material reaches 150 ° C., the heat welded portion located on the low temperature side heat insulating surface can be maintained at 100 ° C. or lower. Therefore, it is not necessary to use a film having a melting point of 200 ° C. or higher for the heat-welded layer, and the vacuum heat insulating material can be configured with an inexpensive material.

  The invention according to claim 10 of the present invention is the invention according to any one of claims 7 to 9, wherein the heat-welded layer of the jacket material is an unstretched polypropylene film, Since the melting point is higher than that of the high-density polyethylene film or the low-density polyethylene film, it can be used up to a higher temperature.

  The invention according to claim 11 of the present invention is the invention according to any one of claims 1 to 10, wherein the resin film of the outer layer of the jacket material is a film of fluororesin or imide resin. As such, these films have a higher or no melting point and are also flame retardant.

  According to a twelfth aspect of the present invention, in the invention according to any one of the first to eleventh aspects, at least the outermost protective layer of the jacket material is a flame retardant film, and It is a vacuum heat insulating material characterized in that a flame retardant member is provided so as to cover the entire end surface of the material, and the outermost layer is covered with a flame retardant film, and slightly on the end surface of the material. The entire outer surface of the vacuum heat insulating material can be made flame retardant by covering the cross section of the non-flame retardant film such as the exposed heat-welded layer with the flame retardant member. Safety can be improved.

  According to the thirteenth aspect of the present invention, the main body or the inside of the main body has a heating element exceeding 100 ° C., a protected member that is adversely affected by the temperature of the heating element, and a thermal effect from the heating element. An apparatus using a vacuum heat insulating material, wherein the heat insulating member is a vacuum heat insulating material according to any one of claims 1 to 12.

  It is effective in a thin space without installing thick heat insulating material to block the heat influence of the heating element, providing a structurally large space, and further providing an air passage to blow air. The adverse effect of heat can be eliminated.

  The invention according to claim 14 of the present invention comprises a main body or a heat-retained part heated to exceed 100 ° C. inside the main body, and a heat insulating member for maintaining the temperature state of the heat-retained part, It is an apparatus using the vacuum heat insulating material, wherein the heat insulating member is the vacuum heat insulating material according to any one of claims 1 to 12.

  In order to keep the heated portion heated to a high temperature, it is possible to effectively keep the heat in a thin space without disposing a thick heat insulating material or consuming a large amount of energy by frequent heating control.

  According to a fifteenth aspect of the present invention, the main body is a printing apparatus, a fixing device having a heat fixing means inside the main body, and a toner storage portion for storing toner melted and fixed on a recording paper by the fixing device; A control device that controls printing, and is provided at least near the outer periphery of either the fixing device, the toner storage unit, or the previous control device, and from the fixing device to the toner storage unit or the control device. The apparatus using a vacuum heat insulating material according to claim 13, further comprising a vacuum heat insulating material that blocks a thermal effect of the heat insulating material.

  Any one of the vacuum heat insulating materials described in claims 1 to 12 has a predetermined heat resistance, and even if it is applied as a heat insulating member of a fixing device having a temperature of about 150 ° C., the heat welded portion deteriorates. Is small and can maintain heat insulation performance for a long time. As a result, the heat from the fixing device is cut off, and the transfer device for transferring the toner, such as the toner storage unit and the photosensitive drum, around the fixing device, and the parts that are easily affected by the heat from the outside such as the control device And the apparatus can be arranged close to each other, which contributes to downsizing and quality improvement of a printing apparatus using the fixing device.

  According to a sixteenth aspect of the present invention, the main body is a fixing device provided in the inside of the printing apparatus for fusing and fixing the toner on the recording paper, and the fixing device is heated by heating means. It has a roller, a pressure roller that presses the recording paper against the heat fixing roller, and at least a heat insulating vacuum heat insulating material disposed so as to surround the heat fixing roller or the pressure roller. An apparatus using the vacuum heat insulating material according to claim 14.

  Any one of the vacuum heat insulating materials described in claims 1 to 12 has a predetermined heat resistance, and among the heat insulating members disposed so as to surround the heat fixing roller having a temperature of about 200 ° C. 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 that reaches about 120 ° C, the deterioration of the heat welded portion of the vacuum heat insulating material is small, and long-term heat insulation performance is achieved. Can be maintained. As a result, the temperature of the heat fixing roller and the pressure roller can be stably maintained with a thin heat insulating material, less energy is required to heat the heat fixing roller, downsizing and quality improvement of the printing apparatus, and This can contribute to shortening the apparatus startup time and energy saving.

  The invention according to claim 17 of the present invention is that the main body is a hot water supply device, and includes a hot water storage container inside the main body, a hot water heater adjacent to the hot water storage container, and a heat insulating material disposed so as to wrap the hot water storage container, 15. The apparatus using a vacuum heat insulating material according to claim 14, wherein a vacuum heat insulating material is disposed at least in a region close to the water heater.

  The temperature around the side surface of the hot water storage container is the hot water temperature of 100 ° C., which is at most the maximum operating temperature. Conventionally, a vacuum heat insulating material has been used, but it cannot be applied to the bottom surface where the water heater is provided. Any one of the vacuum heat insulating materials described in claims 1 to 12 has a predetermined heat resistance, and it is difficult to cool the hot water if it is disposed so as not to exceed 150 ° C. even in the vicinity of the water heater. Power consumption can be reduced, the volume below the hot water storage container can be reduced, and the hot water supply apparatus can be downsized.

  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)
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 cross-sectional view showing a fin portion of the vacuum heat insulating material. 1 and 2, a vacuum heat insulating material 1 covers two core materials 2 so as to cover a core material 3, and the inside is decompressed to a vacuum and the periphery is sealed by thermal welding.

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

  The laminate film 2a is used on the high temperature side of the heat insulating surface, the polychlorinated ethylene fluoride (thickness 50 μm) having a melting point of 210 ° C. is used for the heat welding layer 4a, and the gas barrier layer 5a is thick on the high temperature side. 6 μm thick aluminum foil, the first protective layer 6 a has a melting point of 270 ° C. polyethylene naphthalate (thickness 12 μm), the second protective layer 7 a has a melting point of 260 ° C. tetrafluoroethylene-ethylene copolymer (thickness) 25 μm). Polychlorotrifluoride ethylene has a low melting point among the fluororesin films and is easy to use, and also has excellent gas barrier properties.

  Also, the laminate film 2b is used as the low temperature side of the heat insulating surface, the melting point obtained by depositing polychlorotrifluoride ethylene (thickness 50 μm) same as the laminate film 2a on the heat welding layer 4b and aluminum having a thickness of 500 mm on the gas barrier layer 5b. Polyethylene naphthalate (thickness: 12 μm) at 270 ° C., polyethylene naphthalate (thickness: 12 μm) in which aluminum is vapor-deposited to a thickness of 500 mm on the inside for strengthening the gas barrier property on the first protective layer 6b, The protective layer 7b was a tetrafluoroethylene-ethylene copolymer (thickness 25 μm) having a melting point of 260 ° C.

  In producing the vacuum heat insulating material 1, the laminate films 2a and 2b are faced to each other and the three sides are heat-welded to prepare a bag for inserting the core material.

The core material 3 is one in which carbon black having a powder specific resistance value of 0.6 Ω / cm 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 decompressed to 10 Pa, the remaining side is sealed by thermal welding, and the vacuum heat insulating material 1 having a thickness of 6 mm is obtained. Was made.

  The adhesive between the films is an acrylic or polyester adhesive having a heat resistance of about 160 ° C., an epoxy adhesive having a heat resistance of about 200 ° C., and an epoxy adhesive having a heat resistance of about 250 ° C. An adhesive or the like can be used.

  A vacuum heat insulating material 1 using an acrylic or polyester adhesive having a heat resistance of about 160 ° C. as an adhesive between these materials and the film was prepared, and the sample number N = 15 was prepared and left in an atmosphere at 150 ° C. for 3 years. As a result of the accelerated test, it was confirmed that there was no peeling or delamination between the covering material films in all the samples, and the predetermined heat insulating performance could be maintained.

  In addition, an epoxy adhesive having a heat resistance of about 200 ° C. was used as an adhesive between these materials and the film, and a vacuum heat insulating material 1 was prepared with a sample number N = 15 and left in an atmosphere at 150 ° C. for 5 years. As a result of the accelerated test, it was confirmed that there was no peeling or delamination between the covering material films in all the samples, and the predetermined heat insulating performance could be maintained.

  Further, a silicon-based adhesive having a heat resistance of about 250 ° C. was used as an adhesive between these materials and the film, and a vacuum heat insulating material 1 was prepared with a sample number N = 15 and left in an atmosphere at 150 ° C. for 10 years. As a result of the accelerated test, it was confirmed that there was no peeling or delamination between the covering material films in all the samples, and the predetermined heat insulating performance could be maintained.

  Further, when combustibility was confirmed in accordance with a combustion test of plastic materials for parts of UL94 safety standard equipment, a result equivalent to V-0 was also obtained at the end face of the fin portion.

  As described above, even in a high temperature atmosphere of 150 ° C., the deterioration of the gas barrier property of the heat-welded layer can be suppressed to a small extent, so that the thermal conductivity is hardly deteriorated and the heat insulating performance of the vacuum heat insulating material can be maintained for a long time. In addition, flame retardant properties 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, the resin film used for the heat welding layers 4a and 4b is not particularly specified as long as the resin film can be heat welded at a melting point of 200 ° C. or higher. For example, polyethylene naphthalate having a melting point of 270 ° C., polychloroethylene trifluoride having a melting point of 210 ° C., which is a fluororesin film, a tetrafluoroethylene-ethylene copolymer having a melting point of 260 ° C., and an ethylene tetrafluoride-6 having a melting point of 285 ° C. A fluorinated polypropylene copolymer is desirable.

  The gas barrier layers 5a and 5b have a higher melting point than the films used in the heat-welded layers 4a and 4b, particularly if the metal foil, the film subjected to metal vapor deposition or inorganic oxide vapor deposition, or the resin film has high gas barrier properties. Not specified.

  For example, aluminum foil is often used as the metal foil, and iron, nickel, platinum, tin, titanium, stainless steel, and carbon steel can be used as other metals that have less heat flowing along the metal foil around the vacuum insulation material. . Moreover, aluminum, cobalt, nickel, zinc, copper, silver, or a mixture thereof can be used as a material for metal deposition, and silica, alumina, or the like can be used as a material for inorganic oxide deposition. In addition to polyethylene naphthalate, polyimide film or the like can be used as the resin film to be deposited.

  Further, the protective layers 6a, 6b, 7a and 7b may be films having a higher melting point than the films used in the heat-welded layers 4a and 4b. Specifically, the heat-melting layers 4a and 4b have a melting point of 260 ° C. When a tetrafluoroethylene-ethylene copolymer is used, 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 can be used, and polysulfone and polyetherimide can also be used.

  The core material 3 can use inorganic and organic powder materials, inorganic and organic fiber materials, and is not particularly specified. Examples of the powder material include agglomerated silica powder, foamed perlite ground powder, diatomaceous earth powder, and silicic acid. Inorganic powders such as calcium powder, calcium carbonate powder, clay and talc can be used, and the fiber material is preferably inorganic fiber such as glass wool or ceramic fiber. Among them, inorganic powders having a secondary aggregated particle size of 20 μm or less are desirable. Since these powder materials are very fine, the contact thermal resistance between the particles increases, the solid thermal conductivity decreases, and further, under a pressure of 10 Torr or less. Shows a very low thermal conductivity regardless of pressure. 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 the vacuum heat insulating material according to Embodiment 2 of the present invention, and shows a state in contact with a heating element that is a high temperature portion. In FIG. 3, the outer cover material 9 of the vacuum heat insulating material 8 is an unstretched polypropylene film having a melting point of 160 ° C. with respect to the configuration of the first embodiment. The fin portion 12 composed of the close contact portion 10 in which the core material 3 does not exist and the heat welding portion 11 is bent along the low temperature side heat insulating surface 8b opposite to the high temperature heating element 13, and the heat welding portion 11 is bent. To protect. The configuration of the gas barrier layer and protective layer of the jacket material 9 and the core material 3 is the same as in the first embodiment.

  The adhesive between the films is an acrylic or polyester adhesive having a heat resistance of about 160 ° C., an epoxy adhesive having a heat resistance of about 200 ° C., and an epoxy adhesive having a heat resistance of about 250 ° C. An adhesive or the like can be used.

  A vacuum heat insulating material 1 using an acrylic or polyester adhesive having a heat resistance of about 160 ° C. as an adhesive between these materials and the film was prepared, and the sample number N = 15 was prepared and left in an atmosphere at 150 ° C. for 3 years. As a result of the accelerated test, it was confirmed that there was no peeling or delamination between the covering material films in all the samples, and the predetermined heat insulating performance could be maintained.

  In addition, the vacuum heat insulating material 1 using an epoxy adhesive having a heat resistance of about 200 ° C. as an adhesive between these materials and the film was prepared, and the sample number N = 15 was prepared and left in an atmosphere at 150 ° C. for 5 years. When an expected acceleration test was performed, there was no peeling or delamination between the covering material films in all the samples, and the predetermined heat insulating performance could be maintained.

  Further, a silicon-based adhesive having a heat resistance of about 250 ° C. was used as an adhesive between these materials and the film, and a vacuum heat insulating material 1 was prepared with a sample number N = 15 and left in an atmosphere at 150 ° C. for 8 years. As a result of the accelerated test, it was confirmed that there was no peeling or delamination between the covering material films in all the samples, and the predetermined heat insulating performance could be maintained.

  In addition, 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 higher for the heat-welded layer, gas does not enter from the heat-welded portion 11 without deterioration. The heat insulating performance of the vacuum heat insulating material can be insulated from the heating element 13 at 150 ° C. without deteriorating.

  At this time, there is no problem even if an unstretched polypropylene film, a high-density polyethylene film, a linear low-density polyethylene film, an ethylene-vinyl alcohol copolymer film, or the like is used as the film having a melting point of less than 200 ° C. In addition, it is possible to prevent the intrusion of air and water vapor into the vacuum heat insulating material for a long period of time by using a cover material made of an inexpensive material, and heat insulating performance can be maintained.

(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 Embodiment 2, and is fixed with the flame-retardant tape 14 so that the bending of the fin part 12 may be maintained. An epoxy adhesive is used as an adhesive between the films. At this time, the flame-retardant tape 14 was affixed so that the front-end | tip of the fin part 12 might be covered completely so that the end surface of the jacket material 9 may not be exposed.

  It was 0.0049 W / mK when the heat conductivity of this vacuum heat insulating material 8 was measured. It was 0.0125 W / mK when the heat conductivity after performing the accelerated test expected that this vacuum heat insulating material 8 was left to stand in the atmosphere of 150 degreeC for 5 years was measured.

  Moreover, when combustibility was confirmed based on the combustion test of the plastic material for parts of the equipment of UL94 safety standard, the result equivalent to V-0 was obtained.

  That is, since a non-flame retardant film such as an unstretched polypropylene film constituting the heat-welded layer exposed on the end face of the jacket material 9 is covered with the flame retardant tape 14, flame resistance is also imparted as a vacuum heat insulating material. can do. Therefore, the 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.

  Printing on the recording paper 17 in the printing device 16 having the fixing device 15 forms an electrostatic charge image on the surface of the photosensitive drum 18, adsorbs toner from the toner storage portion 19, and then passes through the transfer drum 20. Transfer to recording paper 17. The recording paper 17 onto which the toner image has been transferred is carried into the fixing device 15, and the recording paper 17 is passed between the heat fixing roller 21 and the pressure roller 22 kept at a high temperature to melt and fix the toner.

  A heat insulating vacuum heat insulating material 23a is disposed around the heat fixing roller 21 and the pressure roller 22 in order to maintain a predetermined high temperature. Further, on the outer frame of the fixing device 15, a blocking vacuum heat insulating material 23 b is disposed on the entire side surface and the upper surface so as not to affect the surroundings. You may arrange | position like the vacuum heat insulating material 23c for interruption | blocking. These vacuum heat insulating materials 23 a, 23 b, and 23 c are configured as shown in Embodiment 1 of the present invention, and the fin portion is further bent on the side opposite to the heat fixing roller 21.

  As a result, the printing quality is improved, and the control device (not shown), the transfer device such as the toner container 19 and the photosensitive drum 18 can be maintained at 45 ° C. or lower for a long time without adversely affecting the toner. .

  Note that the vacuum heat insulating material according to the present invention is not limited to a copying machine as a printing apparatus or a fixing device for a laser printer, but also in a product that needs to insulate or keep warm a heating element of 150 ° C. or less. Can be used.

(Embodiment 5)
FIG. 6 is a sectional view of an electric water heater according to the fifth embodiment of the present invention.

  In FIG. 6, an electric water heater 24 has a hot water storage container 25 for boiling and storing hot water inside the main body, and the upper part is covered with an upper lid 26 that can be opened and closed.

  A donut-shaped heater 27 is closely attached to the bottom surface of the hot water storage container 25, and the controller 28 takes in a signal from the temperature detector 29 and controls the heater 27 to maintain a predetermined temperature. Similarly, a hot water outlet 34 communicates with a hot water outlet 34 through a pump 32 driven by a motor 31 from a suction port 30 provided on the bottom surface. This is done by starting

  Further, a vacuum heat insulating material 36 is wound around the side surface of the hot water storage container 25, and a high temperature vacuum heat insulating material 37 is also disposed outside the heater 27 on the bottom surface. The decline is suppressed. The vacuum heat insulating material 36 on the side surface has been conventionally provided with a structure capable of withstanding 100 ° C., and the vacuum heat insulating material 37 on the bottom surface is newly provided with the structure shown in the third embodiment. is there.

  By insulating the place where the heat insulating material could not be provided due to the high temperature, it was possible to reduce the power consumption by about 5% and maintain the performance for a long time. Moreover, it is not necessary to provide heat insulation by providing a space on the bottom surface of the main body, the volume below the hot water storage container can be reduced, and the hot water supply apparatus can be reduced in size.

  As described above, since the vacuum heat insulating material according to the present invention can suppress a decrease in heat insulating performance in a high temperature atmosphere, a printing apparatus such as a copying machine or a laser printer, a hot water supply device, etc., particularly a device having a high temperature portion, etc. It can be widely applied as a heat insulating material.

Sectional drawing of the vacuum heat insulating material in Embodiment 1 of this invention Sectional drawing which shows the principal part which shows the fin part of the vacuum heat insulating material in Embodiment 1 of this invention. Sectional drawing of the vacuum heat insulating material in Embodiment 2 of this invention The top view of the vacuum heat insulating material in Embodiment 3 of this invention Sectional drawing of the printing apparatus in Embodiment 4 of this invention Sectional drawing of the electric water heater in Embodiment 5 of this invention

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Vacuum heat insulating material 2 Cover material 2a, 2b Laminate 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 Heat insulating surface 9 Cover material 10 Adhering portion 11 Heat welding portion 12 Fin portion 13 Heating element 14 Flame retardant tape 15 Fixing device 16 Printing device 17 Recording paper 18 Photosensitive drum 19 Toner accommodating portion 20 Transfer drum 21 Heat fixing roller 22 Pressure Rollers 23a, 23b, 23c Vacuum insulation material 24 Notebook PC 25 Printed circuit board 26 CPU
32 Vacuum heat insulating material 33 Keyboard 34 Electric water heater 35 Hot water storage container 37 Heater 46, 47 Vacuum heat insulating material

Claims (17)

A core material, and a cover 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 for the gas barrier layer and the protective layer A vacuum heat insulating material characterized in that the melting point of the film is higher than the melting point of the resin film of the heat-welding layer, and the adhesive for laminating the resin films in the previous period is an acrylic or polyester adhesive. A core material, and a cover 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 for the gas barrier layer and the protective layer A vacuum heat insulating material characterized in that the melting point of the film is higher than the melting point of the resin film of the heat-welding layer, and the adhesive for laminating the resin films in the previous period is an epoxy adhesive. A core material, and a cover 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 for the gas barrier layer and the protective layer A vacuum heat insulating material, wherein a melting point of the film is higher than a melting point of the resin film of the heat-welding layer, and an adhesive for laminating the resin films in the previous period is a silicon-based adhesive. The heat-welded layer, the gas barrier layer, and the protective layer of the jacket material are flame retardant films of VTM-2 or higher in accordance with at least UL94 standard. The vacuum heat insulating material as described in the item. The vacuum heat insulating material according to any one of claims 1 to 4, wherein the heat-welded layer is a fluorine resin film. The vacuum heat insulating material according to any one of claims 1 to 4, wherein the heat-welded layer is a polychlorotrifluoride ethylene film. A core material, and a cover material having a laminate structure having a heat-welded layer, a gas barrier layer, and a protective layer, wherein the heat-welded layer is made of a resin film having a melting point of less than 200 ° C., and the protective layer has a melting point of 200 ° C. or higher. It consists of a film, the fin part of the jacket material formed 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 thermal welding, A vacuum heat insulating material, characterized in that the adhesive for laminating the film is an acrylic or polyester adhesive while being bent to the low temperature side. A core material, and a cover material having a laminate structure having a heat-welded layer, a gas barrier layer, and a protective layer, wherein the heat-welded layer is made of a resin film having a melting point of less than 200 ° C., and the protective layer has a melting point of 200 ° C. or higher. It consists of a film, and the core material is covered with the jacket material, the inside is decompressed, and the fin portion of the jacket material formed when the periphery of the core material is sealed by thermal welding, A vacuum heat insulating material characterized in that the adhesive for laminating the film is an epoxy adhesive while being bent to a low temperature side. A core material, and a cover material having a laminate structure having a heat-welded layer, a gas barrier layer, and a protective layer, wherein the heat-welded layer is made of a resin film having a melting point of less than 200 ° C., and the protective layer has a melting point of 200 ° C. or higher. It consists of a film, the fin part of the jacket material formed 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 thermal welding, A vacuum heat insulating material characterized in that the adhesive for laminating the film is a silicon-based adhesive while being bent to a low temperature side. The vacuum heat insulating material according to any one of claims 7 to 9, wherein the heat-welded 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 resin or an imide resin. The flame retardant member is provided so that at least the outermost protective layer of the jacket material is a flame retardant film and covers the entire end surface of the jacket material. The vacuum heat insulating material as described in any one. The main body or a heating element exceeding 100 ° C. inside the main body, a protected member that is adversely affected by the temperature of the heating element, and a heat insulating member that blocks the heat influence from the heat generating body, the heat insulating member being claimed An apparatus using a vacuum heat insulating material, which is the vacuum heat insulating material according to any one of claims 1 to 12. It has a heat retaining part heated to exceed 100 ° C. inside the main body or the main body, and a heat insulating member for maintaining the temperature state of the heat retaining part, and the heat insulating member is one of claims 1 to 12. The apparatus using the vacuum heat insulating material characterized by being the vacuum heat insulating material as described in any one of Claims. The main body is a printing device, a fixing device having a heat fixing means inside the main body, a toner storage portion for storing toner melted and fixed on the recording paper by the fixing device, and a transfer device for transferring the toner to the recording paper And a control device for controlling printing, and provided at least near the outer periphery of the fixing device, the toner storage portion, or the control device, and from the fixing device to the toner storage portion or the control device. The apparatus using the vacuum heat insulating material according to claim 13, further comprising a vacuum heat insulating material that blocks a heat influence on the heat insulating material. The main body is a fixing device provided inside the printing apparatus for fusing and fixing the toner on the recording paper. The fixing device includes a heat fixing roller heated by heating means, and a recording paper on the heat fixing roller. The vacuum heat insulating material according to claim 14, comprising a pressure roller that is in pressure contact 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 hot water supply device, and includes a hot water storage container inside the main body, a hot water heater adjacent to the hot water storage container, and a heat insulating material disposed so as to wrap the hot water storage container, and at least a portion near the hot water heater is a vacuum heat insulating material The apparatus using the vacuum heat insulating material according to claim 14, wherein:

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