JP2006300198A - Vacuum heat insulating material, and warmer and business equipment applying the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To keep a gas barrier property of jacketing materials and to keep heat insulating performance of a vacuum heat insulating material for a long time even when the vacuum heat insulating material is used under high humidity atmosphere. <P>SOLUTION: Two sheets of jacketing materials 13 covering a core material 14 are laminate films respectively composed of a thermal welding layer 16, a polyacrylic acid resin layer 20, a first evaporation layer 21, a base film 22 provided with the first evaporation layer 21, a second evaporation layer 23, a base film 24 provided with the second evaporation layer 23 and nylon 19 successively stacked from an inner side. As the polyacrylic acid resin layer 20 is formed on the first evaporation layer 21 in adjacent thereto, the influence of vapor on the polyacrylic acid resin 20 is reduced, the gas barrier property of the jacketing material 13 can be kept, and gas intrusion from end faces of the jacketing materials 13 can be inhibited, thus the heat insulating performance of the vacuum heat insulating material 12 can be kept for a long time. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a vacuum heat insulating material and a device to which the vacuum heat insulating material is applied.

  In order to maintain the heat insulation performance of the vacuum insulation material over a long period of time, the use of a film with excellent gas barrier properties as the jacket material prevents gas from entering from the outside and maintains the degree of vacuum inside the vacuum insulation material. There is a need. For this reason, conventionally, a film containing a metal foil has been widely used as a covering material.

  However, when a film containing a metal foil is used as a vacuum heat insulating material, heat wraps around the metal foil (heat leak) occurs, and thus there is a problem that the original heat insulating performance cannot be obtained.

  Therefore, as a vacuum heat insulating material that secures gas barrier properties without using metal foil, a vacuum heat insulating material using a jacket material that includes a laminated film having an organic film layer and an inorganic film layer on a base film is used. Yes (see, for example, Patent Document 1).

  FIG. 8 is a cross-sectional view of a jacket material of a conventional vacuum heat insulating material described in Patent Document 1. As shown in FIG. 8, the jacket material 1 has an organic film 3 and an inorganic film 4 on a base film 2, and an inorganic film 4 and a heat welding layer 5 are laminated.

  The conventional configuration is that the organic film 3 provided on the base film 2 smoothes the irregularities on the surface of the base film 2 and blocks the propagation of cracks and defects in the inorganic film 4. It plays the role of relaxing the inorganic film 4 or protecting the inorganic film 4. Further, the gas barrier property and the bendability can be improved by stacking the organic film 3 and the inorganic film 4.

  In addition, there is a vacuum heat insulating material that uses a jacket film that includes a base film, a vapor-deposited thin film layer, an intermediate coating layer containing a water-soluble polymer, and a laminated film in which the vapor-deposited thin film layer is sequentially laminated (for example, Patent Documents) 2).

  FIG. 9 is a cross-sectional view of a jacket material of a conventional vacuum heat insulating material described in Patent Document 2. As shown in FIG. 9, the jacket material 6 includes a base film 7, a vapor deposition thin film layer 8, an intermediate coating layer 9, and a vapor deposition thin film layer 10, and the vapor deposition thin film layer 10 and the heat welding layer 11 are laminated.

The conventional structure expresses high gas barrier properties by the laminated structure.
JP 2003-172493 A JP 2004-130654 A

  However, in the configuration of Patent Document 1 described above, since the humidity dependency of the gas barrier property is large, the deterioration of the gas barrier property becomes more remarkable as the humidity increases. That is, normally, since the use environment of the vacuum heat insulating material is not completely dry, there is a problem that the gas barrier property of the jacket material is deteriorated due to the influence of humidity, and the heat insulating performance is deteriorated.

  Moreover, although the structure which provides two layers of vapor deposition like the said patent document 2 compared with the case where a vapor deposition layer is one layer, although gas barrier property and water vapor | steam barrier property improve, the frequency | count which heat | fever applies to a film, and the frequency | count that tension | tensile_strength are applied. There is a problem that the gas barrier property and the water vapor barrier property are not improved as expected because the film deteriorates due to the increase.

  The present invention solves the above problems, and can maintain the gas barrier property of the jacket material even when the vacuum heat insulating material is used in a high humidity atmosphere, thereby improving the heat insulating performance of the vacuum heat insulating material over a long period of time. It aims to be able to maintain.

  In order to achieve the above object, the vacuum heat insulating material of the present invention is a vacuum heat insulating material comprising a core material and a jacket material covering the core material, the inside of which is sealed under reduced pressure. A laminate film having at least a first vapor deposition layer, a second vapor deposition layer, a polyacrylic acid resin layer, and a heat welding layer, the polyacrylic acid resin layer being adjacent to the first vapor deposition layer. The polyacrylic acid resin layer is located on the inner side of the first vapor deposition layer and is adjacent to the thermal welding layer.

  When the polyacrylic acid resin layer is formed adjacent to the first vapor deposition layer, in particular, when the polyacrylic acid resin layer is formed on the first vapor deposition layer by coating, the surface oxide layer and the poly A strong hydrogen-bonding reaction occurs between the acrylic resin and the vapor-deposited layer and the polyacrylic acid-based resin are strongly bonded. A gas barrier layer with better gas barrier properties than an acrylic resin layer can be formed, and defects in the vapor deposition layer can be filled with a polyacrylic resin, and the polyacrylic resin layer protects the first vapor deposition layer. Therefore, the barrier property is improved as compared with the theoretical calculation value by each gas barrier property lamination.

  By the way, the polyacrylic acid-based resin has a characteristic that the gas barrier property deteriorates as the humidity of the use environment increases. Usually, since the use environment of a vacuum heat insulating material is not an absolute dry state, gas barrier property will deteriorate compared with an absolute dry state by receiving the influence of humidity.

  Then, the 1st vapor deposition layer, the base film in which the 1st vapor deposition layer was formed, the 2nd vapor deposition layer, and the 2nd vapor deposition layer were formed in the outside of polyacrylic acid system resin. By arranging the base film, the amount of water vapor reaching the polyacrylic acid resin layer is suppressed and the polyacrylic acid resin is protected from water vapor. However, the gas barrier property is maintained.

  In addition, since the polyacrylic acid resin layer formed adjacent to the first vapor deposition layer is adjacent to the heat-welded layer, the gas intrusion area on the end surface of the jacket material is reduced, and the gas from the end surface is reduced. Intrusion can also be suppressed.

  The vacuum heat insulating material of the present invention can maintain heat insulating performance for a long period of time even when the vacuum heat insulating material is used in a high humidity atmosphere because the jacket material has excellent gas barrier properties.

  The invention of a vacuum heat insulating material according to claim 1 is a vacuum heat insulating material comprising a core material and a jacket material covering the core material, the inside of which is sealed under reduced pressure, wherein the jacket material is at least first. A laminated film having a second vapor deposition layer, a second vapor deposition layer, a polyacrylic acid resin layer, and a heat welding layer, and the polyacrylic resin layer is formed adjacent to the first vapor deposition layer. The polyacrylic resin layer is inside the first vapor deposition layer and is adjacent to the heat-welded layer.

  When the polyacrylic acid resin layer is formed adjacent to the first vapor deposition layer, in particular, when the polyacrylic acid resin layer is formed on the first vapor deposition layer by coating, the surface oxide layer and the poly A strong hydrogen-bonding reaction occurs between the acrylic resin and the vapor-deposited layer and the polyacrylic acid-based resin are strongly bonded. A gas barrier layer with better gas barrier properties than an acrylic resin layer can be formed, and defects in the vapor deposition layer can be filled with a polyacrylic resin, and the polyacrylic resin layer protects the first vapor deposition layer. Therefore, the barrier property is improved as compared with the theoretical calculation value by each gas barrier property lamination.

  By the way, the polyacrylic acid-based resin has a characteristic that the gas barrier property deteriorates as the humidity of the use environment increases. Usually, since the use environment of a vacuum heat insulating material is not an absolute dry state, gas barrier property will deteriorate compared with an absolute dry state by receiving the influence of humidity.

  Then, the 1st vapor deposition layer, the base film in which the 1st vapor deposition layer was formed, the 2nd vapor deposition layer, and the 2nd vapor deposition layer were formed in the outside of polyacrylic acid system resin. By arranging the base film, the amount of water vapor reaching the polyacrylic acid resin layer is suppressed, and by protecting the polyacrylic resin from water vapor, the influence of water vapor on the polyacrylic acid resin is reduced. The gas barrier property is reduced and the gas barrier property is easily secured, and the gas barrier property is maintained even when the usage environment of the vacuum heat insulating material becomes high.

  Since a film having a vapor deposition layer has a higher water vapor barrier property than a film having no vapor deposition layer, the effect is great even if the number of laminated films is small.

  In addition, since the polyacrylic acid resin layer formed adjacent to the first vapor deposition layer is adjacent to the heat-welded layer, the gas intrusion area on the end surface of the jacket material is reduced, and the gas from the end surface is reduced. Since intrusion can also be suppressed, the heat insulating performance of the vacuum heat insulating material can be further maintained.

  Invention of the vacuum heat insulating material of Claim 2 is what the 2nd vapor deposition layer in the invention of Claim 1 exists inside the base film in which said 2nd vapor deposition layer was formed, The second vapor deposition layer is protected by the base film on which the second vapor deposition layer is formed, and the second vapor deposition layer is unlikely to deteriorate. For this reason, it becomes easier to protect the polyacrylic acid resin, and it becomes easier to secure the gas barrier property.

  According to a third aspect of the present invention, the polyacrylic acid resin layer according to the first or second aspect of the present invention is formed of a mixture of at least a polyalcohol polymer and a polyacrylic acid polymer. is there.

  The polyacrylic acid-based resin layer is formed by casting a mixture solution of a polyalcohol-based polymer and a polyacrylic acid-based polymer on a vapor deposition layer and drying to form a film. It forms by heat-processing at the temperature of. By the heat treatment, the polyalcohol-based polymer and the polyacrylic acid-based polymer are crosslinked by an ester bond. This not only provides water resistance, but also improves gas barrier properties.

  Here, the degree of ester bond can be represented by the degree of esterification. The degree of esterification is the molar ratio of cross-linked carbon / oxygen double bonds to all carbon / oxygen double bonds, and is preferably in the range of 0.01 to 0.5 from the viewpoint of gas barrier properties. . Therefore, a polyalcohol polymer and a polyacrylic acid polymer that are not crosslinked remain.

  After heat treatment, by immersing in water containing metal ions, the metal ions penetrate into the polyacrylic resin layer, and the free carboxylic acids of the polyacrylic acid polymer that is not ester-bonded are polyvalent. Since it is ion-crosslinked with metal ions, the gas barrier properties are further improved.

  Here, the degree of ionic crosslinking can be represented by the degree of ionization. The degree of ionization is a molar ratio of carbon / oxygen double bonds constituting a carboxylate anion to all carbon / oxygen double bonds, and is preferably in the range of 0.01 to 0.9.

  Here, the polyvalent metal ion is not particularly specified, but a metal that becomes a divalent ion such as alkaline earth metal, copper, cobalt, nickel, or a metal that becomes a trivalent ion such as aluminum is desirable. These metals are used in the form of halides, hydroxides, oxides, carbonates, hypochlorites, phosphates, phosphites, hypophosphites, acetates, acrylates, etc. These are dissolved in water to obtain an aqueous metal ion solution. These metal salts may be used alone or in combination of two or more.

  Forming the polyacrylic acid resin layer from the polyalcohol polymer and the polyacrylic acid polymer forms the above-mentioned two types of crosslinks, and thus exhibits excellent gas barrier properties.

  The invention of a vacuum heat insulating material according to a fourth aspect is the invention according to any one of the first to third aspects, wherein both surfaces of the core material are covered with a covering material having the same configuration. Since the gas barrier property of the material is high, not only the heat insulation performance with time is excellent, but also the heat leak can be suppressed because the metal foil for improving the gas barrier property is not required. This configuration is more effective as the size of the vacuum heat insulating material is reduced.

  Further, at this time, when the envelope material is made from a single laminate film, the cross section of the heat-welded layer can be reduced by one side, and gas intrusion from the end face of the heat-welded layer can be suppressed. In addition, if the shape of the vacuum heat insulating material is a rectangle, it is easier to maintain the temporal heat insulating performance if a bag making method is employed in which the long side cross section is reduced by one side. Here, the shape of the jacket material is not particularly specified as long as it is made from a single laminate film, and may be a three-side seal bag, a pillow seal bag, a gusset bag, or the like.

  The invention of the vacuum heat insulating material according to claim 5 is such that the core material in the invention according to any one of claims 1 to 4 is a fibrous body.

  The fiber-based core material is superior to the powder-based core material in initial performance, but it is inferior in pressure dependency. Therefore, to maintain high heat insulation performance, the vacuum inside the vacuum heat insulating material is maintained. There must be. However, since the structure of the jacket material in the present invention is excellent in gas barrier properties, even when a fiber-based core material is used, heat insulation performance can be maintained over a long period of time.

  The invention of the heat insulation device according to claim 6 is an application of the vacuum heat insulating material according to any one of claims 1 to 5 and exhibits an excellent energy saving effect. In addition, even when the operating temperature is relatively high as in the case of a heat retaining device, the structure of the jacket material is excellent in gas barrier properties, so that excellent heat insulation performance can be maintained for a long time, and the heat retaining effect is also long-lasting. Can be maintained over time.

  The invention of the office device according to claim 7 is the one in which the vacuum heat insulating material according to any one of claims 1 to 5 is applied, and measures against heat damage and energy saving are possible. In addition, when making thin and small vacuum heat insulating materials for applications where the space for applying vacuum heat insulating materials is limited, it becomes difficult to use an adsorbent, but the structure of the jacket material is excellent in gas barrier properties. Therefore, the heat insulation performance can be maintained without using an adsorbent or having a metal foil on both the front and back surfaces of the outer cover material of the vacuum heat insulating material. Moreover, heat leak can also be suppressed by not using metal foil.

  The details of the present invention will be further described below.

  The material for vapor deposition in the first vapor deposition layer is not particularly specified, and aluminum, cobalt, nickel, zinc, copper, silver, silica, alumina, a mixture of silica and alumina, diamond-like carbon, and the like can be used. .

  Also, the thickness of the first vapor deposition layer is not particularly specified, but if it is too thin, there will be problems such as unevenness and reduced gas barrier properties. In the case where the film is easily damaged, damage to the film is increased, and heat deposition is increased when the deposition material is metal, the thickness is preferably in the range of 10 to 150 nm. Further, the vapor deposition method is not particularly specified such as a vacuum vapor deposition method, a sputtering method, an ion plating method, and a CVD method.

  In addition, the polyacrylic resin layer is formed on a base film after forming a vapor deposition layer on the base film, but it is formed on a vapor deposition layer of a film having a general-purpose vapor deposition layer. Is also possible. In this case, since the number of steps can be reduced, the cost can be reduced.

  The thickness of the polyacrylic acid resin layer is not particularly specified, but if it is too thin, there will be problems such as unevenness and reduced gas barrier properties. If it is too thick, cracks will occur, it will be easy to peel off, flexibility In the range of 0.1 to 15 [mu] m.

  Also, the base film is not particularly specified. Polyethylene terephthalate (hereinafter abbreviated as PET), polyethylene naphthalate (hereinafter abbreviated as PEN), polypropylene (hereinafter abbreviated as OPP), polyethylene, nylon, polyphenylene sulfide, polyimide, ethylene -Polyvinyl alcohol copolymer resin and the like can be used, but it is desirable to select a resin having a melting point of 200 ° C or higher or a resin with little dimensional deformation in consideration of the heat treatment step when forming the acrylic resin layer. .

  Next, the polyalcohol polymer and the polyacrylic acid polymer that form the polyacrylic acid resin layer will be described.

  The polyalcohol polymer is an alcohol polymer having two or more hydroxyl groups in the molecule, and specifically includes polyvinyl alcohol (hereinafter abbreviated as PVA) and saccharides. These may be used alone or in combination of two or more.

  Among them, when PVA is used, high gas barrier properties are exhibited. Therefore, when importance is attached to gas barrier properties, it is desirable to use PVA. PVA preferably has a saponification degree of 95% or more and an average degree of polymerization of 300 to 1500. Examples of the saccharide include monosaccharides, oligosaccharides, sugar alcohols, and polysaccharides, and sorbitol, dextrin, water-soluble starch and the like are desirable from the viewpoint of gas barrier properties.

  The polyacrylic acid polymer is an acrylic acid polymer or a partially neutralized product thereof, a methacrylic acid polymer or a partially neutralized product thereof, an acrylic acid and a methacrylic acid copolymer or a partially neutralized product thereof, or these Such as a mixture.

  Here, the partially neutralized product is obtained by partially neutralizing the carboxyl group of polyacrylic acid with an alkali such as sodium hydroxide, lithium hydroxide, or potassium hydroxide. The degree of neutralization is preferably in the range of 0 to 20% from the viewpoint of gas barrier properties. Among them, a homopolymer of acrylic acid or methacrylic acid or a copolymer of both is desirable, and particularly when a homopolymer of acrylic acid or a copolymer with methacrylic acid in which acrylic acid is a dominant amount is used, gas barrier properties are improved. desirable. The average molecular weight of the polyacrylic acid polymer is not particularly limited, but is preferably in the range of 2000 to 250,000.

  In addition, the mixing ratio of the polyalcohol-based polymer and the polyacrylic acid-based polymer is 90 by weight in the case of using PVA as the polyalcohol-based polymer from the viewpoint of having an excellent gas barrier property even under high humidity conditions. When the saccharide is used as the polyalcohol polymer, the range of 90:10 to 20:80 is desirable.

  Further, the heat treatment conditions are such that the heat treatment temperature is usually in the range of 100 to 250 ° C., the heat treatment time is in the range of 1 second to 30 minutes, a long time when the heat treatment temperature is low, and a short time when the heat treatment temperature is low. Do.

  In addition, the material for vapor deposition in the second vapor deposition layer is not particularly specified, and aluminum, cobalt, nickel, zinc, copper, silver, silica, alumina, a mixture of silica and alumina, diamond-like carbon, etc. can be used. It is.

  Also, the thickness of the second vapor deposition layer is not particularly specified, but if it is too thin, there will be problems such as unevenness and reduced gas barrier properties. In the case where the film is easily damaged, damage to the film is increased, and heat deposition is increased when the deposition material is metal, the thickness is preferably in the range of 10 to 150 nm. Further, the vapor deposition method is not particularly specified such as a vacuum vapor deposition method, a sputtering method, an ion plating method, and a CVD method.

  Further, the base film is not particularly specified, and PET, PEN, OPP, polyethylene, nylon, ethylene-polyvinyl alcohol copolymer resin, and the like can be used.

  Further, the heat welding layer is not particularly specified, and polyethylene, unstretched polypropylene (hereinafter abbreviated as CPP), polyacrylonitrile (hereinafter abbreviated as PAN), unstretched PET, unstretched nylon, unstretched ethylene-polyvinyl alcohol copolymer. A coalesced resin or the like can be used. Further, an adsorbent may be contained in the heat welding layer.

  Further, it is possible to further provide a film on the outer layer or the intermediate layer for the purpose of improving pinhole resistance and wear resistance, imparting flame retardancy, and the like.

  Here, the type and number of laminated layers of the outer layer and the intermediate layer are not particularly specified, and nylon, ethylene / tetrafluoroethylene copolymer resin (hereinafter abbreviated as ETFE), PET, PEN, OPP, ethylene -Polyvinyl alcohol copolymer resin, polyethylene, etc. can be used, but the lower the moisture permeability of the film provided outside the composite film, the less the polyacrylic acid resin layer is affected by water vapor and the better the gas barrier properties In order to achieve this, it is desirable to select a film having as low a moisture permeability as possible. Among them, a stretched film such as polyethylene, OPP, PET, or PEN or a film having a vapor deposition layer is more desirable.

  Further, the core material is not particularly specified such as fiber, powder, foamed resin, porous body, and thin film laminate. For example, glass wool, glass fiber, alumina fiber, silica alumina fiber, silica fiber, rock wool, silicon carbide fiber, etc. can be used in the fiber system, silica, perlite, carbon black in the powder system, urethane foam, phenol in the foamed resin Foam, styrene foam, etc. can be used.

  Moreover, it is also possible to use these mixtures and a molded object. When the initial heat insulating performance is required, it is preferable to use a fiber in which fibers are laminated perpendicularly to the heat transfer direction or a molded body thereof, and when the time-insulating thermal performance is required, a powder or a powder molded body may be used.

  In order to further improve the initial heat insulation performance and the temporal heat insulation performance of the vacuum heat insulating material, it is possible to use a moisture adsorbent or a gas adsorbent. The type of adsorbent to be used is not particularly specified, and calcium oxide, magnesium oxide, barium oxide, zeolite, silica gel, hydrotalcite, etc. can be used. You may use it in combination.

  The manufacturing method of the vacuum heat insulating material is not particularly specified, and it may be obtained by making a bag from the laminate film and then inserting the core into the jacket material and reducing the pressure inside to seal it. Alternatively, the core material and the jacket material may be installed in the vacuum chamber, and the portion containing the core material may be heat-welded in a state where the jacket material is along the core material.

  Here, in the case of the latter production method, since deterioration of the film due to heat applied to the entire surface of the outer cover material is considered, the resin used other than the heat welding layer with respect to the melting point of the resin used for the heat welding layer It is desirable to set the melting point of the material to be 40 ° C. or higher.

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

(Embodiment 1)
FIG. 1 is a cross-sectional view of a vacuum heat insulating material according to Embodiment 1 of the present invention. In FIG. 1, a vacuum heat insulating material 12 is obtained by covering a core material 14 with a covering material 13 and sealing the inside of the covering material 13 under reduced pressure.

  First, the manufacturing method of the vacuum heat insulating material 12 is demonstrated.

  First, two sheets of laminate film cut into the same size rectangle are faced to each other and three sides are heat welded to produce a bag-shaped outer covering material 13.

  Next, the core material 14 and the adsorbent 15 that have been dried for about 1 hour in a drying furnace at 140 ° C. are inserted from the opening of the jacket material 13. This is installed in a chamber, and after the inside is depressurized to 10 Pa or less, the opening is thermally welded to obtain the vacuum heat insulating material 12.

  Next, the configuration of the vacuum heat insulating material 12 will be described.

  FIG. 2 is a cross-sectional view of the vacuum heat insulating material according to Embodiment 1 of the present invention. As shown in FIG. 2, the cover material 13 was a laminated film having the same configuration on the front surface and the back surface of the vacuum heat insulating material 12.

  The jacket material 13 has a configuration in which the heat-welding layer 16 is CPP, the film A 17 is provided on the outer side, the film B 18 is provided on the outer side, and the nylon 19 is provided on the outermost layer.

  The direction of the film A17 is the order of the polyacrylic acid resin layer 20, the first vapor deposition layer 21, and the base film 22 from the inside, and the polyacrylic acid resin layer 20 is in the portion of PVA and polyacrylic acid. The first deposition layer 21 is made of aluminum, and the base film 22 is made of PET.

  The direction of the film B18 is, from the inside, the second vapor deposition layer 23 and the base film 24, the second vapor deposition layer 23 is aluminum, and the base film 24 is PET. Moreover, the core material 14 is a molded object comprised from glass fiber.

  The vacuum heat insulating material 12 in the present embodiment includes a core material 14, an adsorbent 15, and two jacket materials 13 that cover the core material 14 and the adsorbent 15, and the vacuum heat insulation in which the inside is sealed under reduced pressure. The material 12 is a laminate film in which the outer cover material 13 includes at least a first vapor deposition layer 21, a second vapor deposition layer 23, a polyacrylic acid resin layer 20, and a heat welding layer 16, and a polyacrylic acid material. The resin layer 20 is formed adjacent to the first vapor deposition layer 21, and the polyacrylic acid resin layer 20 is inside the first vapor deposition layer 21 and is adjacent to the heat welding layer 16. The second vapor-deposited layer 23 is on the inner side of the base film 24 on which the second vapor-deposited layer 23 is formed, and both surfaces of the core material 14 have the same configuration. It is covered with.

  That is, two outer cover materials 13 covering the core material 14 were formed with the heat welding layer 16, the polyacrylic acid resin layer 20, the first vapor deposition layer 21, and the first vapor deposition layer 21 in order from the inside. The laminate film is composed of a base film 22, a second vapor deposition layer 23, a base film 24 on which the second vapor deposition layer 23 is formed, and nylon 19.

  By forming the polyacrylic acid-based resin layer 20 from a polyalcohol-based polymer and a polyacrylic acid-based polymer, the gas barrier property is improved in order to form a dense cross-linked structure, and the polyacrylic acid-based resin layer Since 20 adjoins the 1st vapor deposition layer 21, the 1st vapor deposition layer 21 is protected and it becomes the outstanding gas barrier property.

  For this reason, even if the core material 14 is a fiber type core material which is not excellent in pressure dependency, heat insulation performance can be maintained. Furthermore, since the film B18 is provided on the outer layer of the film A17, even when used in a high-humidity atmosphere, the influence of water vapor on the polyacrylic resin 20 is reduced, and the heat insulating performance of the vacuum heat insulating material 12 can be maintained.

  In addition, in this Embodiment, although the laminated film of the same structure was used by the surface and the back surface of the vacuum heat insulating material 12, you may use the laminated film of a different structure. Further, in this embodiment, two laminate films are used and the shape of the jacket material 13 is a four-side seal bag. However, the shape of the jacket material 13 is a three-side seal bag using one laminate film. It is good.

(Embodiment 2)
FIG. 3 is a cross-sectional view of the vacuum heat insulating material in the second embodiment of the present invention, and FIG. 4 is a plan view of the vacuum heat insulating material in the second embodiment.

  In FIG. 3, a vacuum heat insulating material 25 is obtained by covering a core material 27 with a covering material 26 and sealing the inside of the covering material 26 under reduced pressure.

  First, a method for producing the vacuum heat insulating material 25 will be described.

  First, the core material 27 is placed on the outer cover material 26 with the heat-welding layer side facing up, and this is covered with another outer cover material 26 so that the heat-welding layers face each other, and this is placed in the chamber. Install. Further, after the inside of the chamber is evacuated, the entire surface of the outer covering material 26 is heated and pressurized with a hot plate made of silicon rubber, and heat welding is performed to obtain a vacuum heat insulating material 25 as shown in FIG. Finally, a vacuum heat insulating material 25 is obtained by cutting with a cutting line 28 in a heat welding portion composed only of the jacket material 26. The size of the vacuum heat insulating material 25 is a business card size.

  Next, the configuration of the vacuum heat insulating material 25 will be described.

  FIG. 5 is a cross-sectional view of the vacuum heat insulating material in the second embodiment. As shown in FIG. 5, the outer cover material 26 was a laminate film having a different configuration on the front surface and the back surface of the vacuum heat insulating material 25.

  The surface has a configuration in which the heat welding layer 29 is PAN, the film A30 is provided on the outer side, the film B31 is provided on the outer side, and the ETFE 32 is provided on the outermost layer. The direction of the film A30 is the order of the polyacrylic acid resin layer 33, the first vapor deposition layer 34, and the base film 35 from the inside, and the configuration of the polyacrylic acid resin layer 33 is the same as that of the first embodiment. The first vapor deposition layer 34 is aluminum, and the base film 35 is PEN. The direction of the film B31 is the second vapor deposition layer 36 and the base film 37 from the inside, the second vapor deposition layer 36 is aluminum, and the base film 37 is PEN.

  Further, the rear surface has a configuration in which the heat-welded layer 29 is PAN, the outer side thereof is an aluminum foil 38, the outer layer is PEN 39, and the outermost layer is ETFE 32. The core material 27 is a mixed powder of dry silica and carbon black in a nonwoven fabric.

  The vacuum heat insulating material 25 in the present embodiment is composed of a core material 27 and two outer cover materials 26 covering the core material 27, and is a vacuum heat insulating material 25 whose inside is sealed under reduced pressure. The material 26 is a laminate film having at least a first vapor-deposited layer 34, a second vapor-deposited layer 36, a polyacrylic acid-based resin layer 33, and a heat-welded layer 29. The polyacrylic acid-based resin layer 33 is a first vapor-deposited layer. The polyacrylic resin layer 33 is formed on the layer 34 so as to be adjacent to the heat-deposited layer 29 on the inner side of the first vapor deposition layer 34, and the second layer 34. The vapor deposition layer 36 is inside the base film 37 on which the second vapor deposition layer 36 is formed.

  That is, the outer covering material 26 of the two outer covering materials 26 covering the core material 27 is, in order from the inside, the heat-welded layer 29, the polyacrylic acid resin layer 33, the first vapor deposition layer 34, the first The laminate film is composed of the base film 35 on which the vapor deposition layer 34 is formed, the second vapor deposition layer 36, the base film 37 on which the second vapor deposition layer 36 is formed, and ETFE 32.

  By forming the polyacrylic acid resin layer 33 from a mixture of a polyalcohol polymer and a polyacrylic acid polymer, the gas barrier property is improved to form a dense cross-linked structure, and the polyacrylic acid resin layer Since 33 adjoins the 1st vapor deposition layer 34, the 1st vapor deposition layer 34 is protected and it becomes the outstanding gas barrier property.

  Moreover, since the film B31 is provided in the outer layer of the film A30, the heat insulation performance can be maintained even when the size of the vacuum heat insulating material 25 is small and the adsorbent cannot be used. Since the polyacrylic resin layer 33 is adjacent to the heat welding layer 29, the amount of gas intrusion from the end face is reduced.

  In addition, since the heat resistance of the polyacrylic acid resin layer 33 and the base film 35 in the film A30 is high, the film is not deteriorated even in the manufacturing method of the vacuum heat insulating material 25 in which the entire covering material 26 is heated. Gas barrier properties can be maintained.

(Embodiment 3)
FIG. 6 is a cross-sectional view of an electric water heater as a heat retaining device to which the vacuum heat insulating material in Embodiment 3 is applied.

  As shown in FIG. 6, the electric water heater 40 includes an outer container 41, a water storage container 42, a heater 43, a lid 44, and the vacuum heat insulating material 12 of the first embodiment.

  The water storage container 42 is heated and kept warm by a heater 43, and heat radiation from the side surface of the water storage container 42 is suppressed by the vacuum heat insulating material 12 during the heat keeping.

  By applying the vacuum heat insulating material 12, an excellent energy saving effect is shown. When the power consumption was measured, a reduction of about 10% was confirmed compared to the case where no vacuum heat insulating material was applied. Moreover, since metal foil was not used for the jacket material of the vacuum heat insulating material 12, generation | occurrence | production of heat leak could also be suppressed. In addition, the usage environment of the electric water heater 40 may sometimes be high in humidity, but even if a metal foil is not used, the jacket material has excellent gas barrier properties, so that the heat insulation performance over time can be maintained, and the heat retaining effect can be maintained. Can be maintained for a long time.

  In this embodiment, the vacuum heat insulating material 12 is applied to the heat insulation of the side surface of the water storage container 42 of the electric water heater 40. However, it can also be applied to the lid.

  Moreover, the heat insulation apparatus in this invention is not restricted to an electric water heater, It can be used for the apparatus aiming at heat insulation, such as a rice cooker, a heat insulation cooker, and a water heater.

(Embodiment 4)
FIG. 7 is a cross-sectional view of the notebook computer according to the fourth embodiment. As shown in FIG. 7, the notebook computer 45 is provided between the heat generating portion 47 on the main board 46 inside the device and the bottom of the device case 48. The vacuum heat insulating material 25 of the second embodiment and the heat radiating plate 49 are provided, and the vacuum heat insulating material 25 is in close contact with the bottom of the device case 48.

  The notebook computer 45 configured as described above has a vacuum heat insulating material 25 having an excellent heat insulating effect to effectively block the heat transfer to the bottom surface, thereby suppressing the temperature rise on the surface of the apparatus, which is inconvenient for the user. Pleasure can be reduced. In addition, when the temperature of the bottom face was measured, the fall of 6 degreeC has been confirmed compared with the case where the vacuum heat insulating material is not applied.

  Even if the size of the vacuum heat insulating material 25 is small and thin as in the present embodiment, since the jacket material has excellent barrier properties, it is possible to maintain the heat insulating performance over time. It can also be applied to products such as computers that are required to be small and thin and have limited space for applying heat insulating materials.

  The office equipment in the present invention is not limited to a notebook computer, but heat insulation between a heat generating part and toner in a printing apparatus such as a copier or a printer, and a liquid crystal part and a CPU of a car navigation system having a liquid crystal panel It can also be applied to other office equipment that requires heat insulation, such as heat insulation of heat-generating parts.

  Hereinafter, although the jacket material which comprises the vacuum heat insulating material of this invention is demonstrated concretely using an Example and a comparative example, this invention is not limited only to a present Example.

Example 1
With the vacuum heat insulating material having the configuration described in Embodiment 1, a temperature acceleration test and a humidity acceleration test were performed. The test conditions are 100 ° C. and 40 ° C. and 95% RH.

(Example 2)
The direction of the film B of Example 1 was changed, and the same test as in Example 1 was performed.

  The configuration of the jacket material is CPP, film A, film B, and nylon from the inside. The direction of film A is the same as in Example 1, and the direction of film B is the base film and the vapor deposition layer from the inside. is there.

(Example 3)
The direction of the film A in Example 1 was changed, and the same test as in Example 1 was performed.

  The configuration of the jacket material is CPP, film A, film B, and nylon from the inside, and the direction of film A is the base film, vapor deposition layer, and acrylic resin layer from the inside, and film B The direction of is the same as in Example 1.

Example 4
The same test as in Example 1 was performed with the configuration of the vacuum heat insulating material described in the second embodiment.

(Example 5)
A vacuum heat insulating material using the laminate film used for the surface of Embodiment 2 on both sides was produced, and the same test as in Example 1 was performed.

(Comparative Example 1)
The polyacrylic acid resin layer of Example 1 was formed from a polymer of polyacrylic acid, and the same test as in Example 1 was performed.

(Comparative Example 2)
The film B of Example 1 was changed to PET, and the same test as in Example 1 was performed.

(Comparative Example 3)
A vacuum heat insulating material was produced using the jacket material in which the order of lamination in Example 1 was changed, and the same test as in Example 1 was performed.

  The structure of the jacket material is CPP, film B, film A, and nylon from the inside. Moreover, the direction of the film B is a vapor deposition layer and a base film from the inner side, and the direction of the film A is an acrylic resin layer, a vapor deposition layer, and a base film from the inner side.

(Comparative Example 4)
A vacuum heat insulating material was produced using the jacket material in which the order of lamination in Example 1 was changed, and the same test as in Example 1 was performed.

  The structure of the jacket material is CPP, film B, film A, and nylon from the inside. The direction of the film B is a base film and a vapor deposition layer from the inside, and the direction of the film A is an acrylic resin layer, a vapor deposition layer, and a base film from the inside.

(Comparative Example 5)
A vacuum heat insulating material was produced using the jacket material in which the order of lamination in Example 1 was changed, and the same test as in Example 1 was performed.

  The structure of the jacket material is CPP, film B, film A, and nylon from the inside. The direction of the film B is a base film and a vapor deposition layer from the inside, and the direction of the film A is a base film, a vapor deposition layer, and an acrylic resin layer from the inside.

(Comparative Example 6)
An aluminum vapor deposition layer is provided on the acrylic resin layer of the film A of Example 3 to form a base film, a vapor deposition layer, an acrylic acid resin layer, and a film (film C) having a vapor deposition layer. In addition, a vacuum heat insulating material was produced using a jacket material in which the film B was changed to PET, and the same test as in Example 1 was performed.

  The structure of the jacket material is CPP, film C, PET, nylon from the inside. The film C is a base film, a vapor deposition layer, an acrylic resin layer, and a vapor deposition layer from the inside.

(Comparative Example 7)
A vacuum heat insulating material using the laminate film used for the back surface of the second embodiment on both sides was produced, and the same test as in Example 1 was performed.

  The initial thermal conductivity and the thermal conductivity after the tests in Examples 1 to 5 and Comparative Examples 1 to 7 are shown in (Table 1).

実施例１、比較例１を比較すると、ポリアクリル酸系樹脂層をポリアルコール系ポリマーとポリアクリル酸系ポリマーとから形成した方が、断熱性能を維持できることがわかる。また、実施例１の外被材の構成はガスバリア性に優れているために、繊維系芯材を使用しても断熱性能の悪化が少なかった。

Comparing Example 1 and Comparative Example 1, it can be seen that the heat insulation performance can be maintained when the polyacrylic resin layer is formed of a polyalcohol polymer and a polyacrylic polymer. Moreover, since the structure of the jacket material of Example 1 was excellent in gas barrier properties, there was little deterioration in heat insulation performance even when a fiber-based core material was used.

  Comparing Example 1 and Comparative Example 2, it can be seen that the film B on the outside of the film A can easily maintain the heat insulation performance under high humidity conditions. In addition, although Examples 1 to 3 and Comparative Examples 3 to 5 have the same film constituting the covering material, the heat insulation performance in the high humidity condition is that the film B is outside the film A. It is easy to maintain.

  Furthermore, although the comparative example 6 has two vapor deposition layers in a laminated structure like Examples 1-3 and Comparative Examples 3-5, the heat insulation performance after a temperature acceleration test deteriorates. Is big. This is considered to be due to an increase in the number of steps for providing two vapor deposition layers and an increase in the number of times that heat and tension are applied to the film, thereby increasing the damage to the film.

  Furthermore, comparing Examples 1 to 3, the deterioration of the heat insulation performance due to temperature acceleration is almost the same regardless of the direction of the vapor deposition layer in the film B and the direction of the polyacrylic resin layer in the film A. About deterioration of the heat insulation performance in humidity acceleration, the direction of the vapor deposition layer in the film B is the inside, and the direction of the polyacrylic acid resin layer in the film A is the inside, the deterioration of the heat insulation performance is small and the effect is high. I understand.

  Furthermore, since the structure of the jacket material in Examples 1 to 3 was excellent in gas barrier properties, there was little deterioration in heat insulation performance even when a fiber-based core material was used.

  When Examples 4 and 5 and Comparative Example 7 are compared, it can be seen that since the size of the vacuum heat insulating material is small, the influence of heat leak is increased, and the initial thermal conductivity can be reduced without using a metal foil.

  In addition, when a life simulation was performed from the results of the temperature acceleration test and the humidity acceleration test, Example 4 and Example 5 were superior to Comparative Example 7 in terms of thermal conductivity even after 10 years. Even when the size of the vacuum heat insulating material is small and the adsorbent cannot be used as in the present embodiment, the outer shell material has excellent gas barrier properties, so even if the metal foil is not used on both sides, The insulation performance could be maintained.

  As mentioned above, since the vacuum heat insulating material concerning this invention is excellent in the gas barrier property of a jacket material, it can maintain heat insulation performance over a long period of time. For this reason, the present invention is not limited to a heat insulating device that requires energy saving, but can be applied to a cold insulating device such as a refrigerator that requires energy saving as well as the heat insulating device. When applied to cold insulation equipment, it is more effective when used in the vicinity of the compressor or in the portion adjacent to the mullion pipe because of its excellent gas barrier properties at high temperatures. Moreover, the present invention can be applied not only to devices but also to applications that require cold storage such as container boxes and cooler boxes. Furthermore, since the heat insulation performance can be maintained even if the vacuum heat insulating material is small and thin, it can be applied not only to office equipment but also to applications that require heat insulation such as cold protection equipment and bedding. It is.

Schematic cross-sectional view of the vacuum heat insulating material in Embodiment 1 of the present invention Detailed sectional drawing of the vacuum heat insulating material in Embodiment 1 of this invention Schematic sectional view of a vacuum heat insulating material in Embodiment 2 of the present invention The top view of the vacuum heat insulating material in Embodiment 2 of this invention Detailed sectional drawing of the vacuum heat insulating material in Embodiment 2 of this invention Sectional drawing of the electric water heater in Embodiment 3 of this invention Sectional drawing of the notebook computer in Embodiment 4 of this invention Sectional drawing of an example of the jacket material of the conventional vacuum heat insulating material Sectional drawing of another example of the jacket material of the conventional vacuum heat insulating material

Explanation of symbols

DESCRIPTION OF SYMBOLS 12 Vacuum heat insulating material 13 Cover material 14 Core material 16 Heat welding layer 20 Polyacrylic-acid-type resin layer 21 1st vapor deposition layer 23 2nd vapor deposition layer 24 Base film 25 Vacuum heat insulating material 26 Cover material 27 Core material 29 Thermal welding layer 33 Polyacrylic acid resin layer 34 First vapor deposition layer 36 Second vapor deposition layer 37 Base film

Claims (7)

  A vacuum heat insulating material comprising a core material and a jacket material covering the core material, the inside of which is sealed under reduced pressure, wherein the jacket material is at least a first vapor deposition layer, a second vapor deposition layer, and polyacrylic acid A laminate film having a resin layer and a heat-welding layer, wherein the polyacrylic resin layer is formed adjacent to the first vapor deposition layer, and the polyacrylic resin layer is The vacuum heat insulating material which exists inside the said 1st vapor deposition layer and is adjacent to the said heat welding layer.   The vacuum heat insulating material according to claim 1, wherein the second vapor-deposited layer is inside the base film on which the second vapor-deposited layer is formed.   The vacuum heat insulating material according to claim 1 or 2, wherein the polyacrylic acid resin layer is formed of a mixture of at least a polyalcohol polymer and a polyacrylic acid polymer.   The vacuum heat insulating material as described in any one of Claim 1 to 3 with which the both surfaces of a core material are coat | covered with the jacket material of the same structure.   The vacuum heat insulating material according to any one of claims 1 to 4, wherein the core material is a fibrous body.   A heat retaining device to which the vacuum heat insulating material according to any one of claims 1 to 5 is applied.   Office equipment to which the vacuum heat insulating material according to any one of claims 1 to 5 is applied.

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