KR101164306B1 - Vacuum heat insulating material, heat-insulating box body using the same and refrigerator - Google Patents

Abstract

An object of the present invention is to provide a vacuum heat insulator which can achieve both a heat insulating performance and an environmental load, and realizes a cycle type eco recycling.

The core material 3 which consists of an organic fiber assembly, the getter agent 4 which adsorb | sucks gas or water vapor, and the outer wrapper material 2 which has gas barrier property which accommodates the core material 3 and the getter agent 4 is carried out. And a vacuum insulator (1) vacuum-sealed the inside of the outer cover material (2), and the core material (3) is a sheet formed by melting spinning a material excellent in an environment composed of carbon and hydrogen and having low hygroscopicity. It consists of a fibrous web. Specifically, the core material 3 is a general-purpose polystyrene resin and is formed by melt spinning of melt-blown and / or spunbond. Moreover, the average fiber diameter of a core material is 8 micrometers-20 micrometers, and it is a vacuum heat insulating material whose density of a core material is 150-300 kg / m <3>.

Vacuum Insulator, Core Material, Sheathing Material, Organic Fiber Assembly, Getter

Description

Vacuum Insulator and Insulation Box and Refrigerator Using It {VACUUM HEAT INSULATING MATERIAL, HEAT-INSULATING BOX BODY USING THE SAME AND REFRIGERATOR}

TECHNICAL FIELD The present invention relates to a vacuum insulator, a heat insulating box body and a refrigerator using the same, which improve the heat retention and cold storage function, and which have a low environmental load and are excellent in recycling properties.

In recent years, from the viewpoint of global warming, the necessity of reducing the power consumption of home appliances has been demanded. Among them, refrigerators, air conditioners, and the like are particularly high power consumption products, and there is a need for reducing power consumption as a global warming measure. Taking the refrigerator as an example, the power consumption of the refrigerator is largely determined by the efficiency of the compressor for cooling in the refrigerator and the heat insulating performance related to the amount of heat leakage from the refrigerator when the load in the refrigerator is constant. Therefore, in the technical development of a refrigerator, the performance improvement of a heat insulating material is calculated | required with the efficiency of a compressor.

Vacuum insulation is one of the heat insulating materials which solve such a subject. A vacuum heat insulating material is produced by putting the core material excellent in heat insulation in the outer cover material which has gas barrier property, and making an inside into a vacuum. Glass wool of inorganic fiber is used for the core material of a vacuum heat insulating material, and it is commercialized with the ultrafine fiber (average fiber diameter: 3-5 micrometers).

On the other hand, as a core material of organic fiber, it is disclosed by the following publication etc. For example, Patent Document 1 discloses a core material for vacuum insulation material containing fibers of glass wool and thermoplastic resin, wherein polypropylene, acrylic, polyethylene terephthalate, polyamide, and polyethylene as thermoplastic resin fibers are heated by melting and pressing. The vacuum heat insulating material which has the heat insulation performance excellent in shape retention with high pressure resistance, without sealing an adsorbent by making it the structure which adhere | attached glass wool is described.

In addition, Patent Document 2 discloses a vacuum insulator in which an inner material containing a core material containing a polyester fiber is contained in an outer pressure material in a reduced pressure state, wherein the thickness of the polyester fiber is 1 to 6 deniers, and the inner material is polyethylene terephthalate or core. By setting the density of the ash to 150 to 300 kg / m 3, a vacuum insulator having a low thermal load during production and recycling, excellent handleability and production efficiency, and good heat insulation for a long time is described.

Further, Patent Document 3 discloses a fiber aggregate comprising at least two kinds of polyester fibers having different melting points in a sheet-like core material for vacuum insulator, wherein the fiber aggregate is processed into a sheet shape by a thermal bond method or a needle punch method. When the low-melting polyester fiber is 110 to 170 ° C, the high-melting polyester fiber is 20 ° C or more higher, the fiber thickness is 1 to 6 deniers, and the blending ratio is 10: 90 to 30: 70, so that during production or recycling, Good thermal insulation vacuum insulators having low environmental load and excellent workability are described.

In addition, Patent Document 4 discloses that the core material is a sheet-like fiber aggregate containing 50% by weight or more of polyester fibers having a fiber thickness of 1 to 6 deniers, and the average fiber diameter is 9 to 25 µm, and the fiber aggregate is processed into a sheet shape with a needle punch. When the density of the core material is 150 to 300 kg / m 3, an excellent heat insulating vacuum heat insulating material having low environmental load during production and recycling and excellent handling properties is described.

In addition, Patent Document 5 discloses a sheet-like fiber aggregate made of organic fibers, wherein the thickness of the vacuum insulator after vacuuming the core material is 0.1 to 5 mm, and the gas adsorbing material is a polyester fiber nonwoven fabric of a soft cloth bag, and the weight thereof is 30 to 30. By making 200 g / m <2> and a core material polyester fiber, the vacuum heat insulating material excellent in the handleability at the time of manufacture and recycling, and excellent in curvature and heat insulation property after vacuuming is described.

[Patent Document 1] Japanese Patent Application Laid-Open No. 2003-155651

[Patent Document 2] Japanese Patent Application Laid-Open No. 2006-283817

[Patent Document 3] Japanese Patent Application Laid-Open No. 2006-57213

[Patent Document 4] Japanese Patent Application Laid-Open No. 2006-29505

[Patent Document 5] Japanese Patent Application Laid-Open No. 2006-153199

However, the following problem to be solved exists in the technique disclosed by the above-mentioned patent documents 1-5. For example, in the vacuum insulator described in Patent Document 1, the glass wool and the thermoplastic resin fibers are heated and melted (about 180 to 220 ° C.) and pressurized (about 1 kg / cm 2) to be a core material that adheres to the glass wool. It is. Therefore, since the fiber of a thermoplastic resin has a function of an organic binder, heat insulation performance falls by the influence of outgas.

In addition, when a suitable amount of glass wool and thermoplastic resin are completely mixed and opened, and the laminate of the cotton-like mixture is used as the core material, in the mixing of the thermoplastic resin fibers, the junction area between the fibers increases and the heat transfer path increases. Therefore, there exists a subject that heat insulation performance falls. That is, in the case of glass wool and thermoplastic resin fibers, the thermal conductivity of the core material is different in the mixed fiber laminates and the respective fiber laminates, and the heat insulation is greatly inferior in the mixed fiber laminates described in the specification.

In addition, although bending of the vacuum insulation material is not described, bending along the shape of the installed part is difficult in the core material of the glass wool, and if it is bent forcibly, the insulation performance is reduced by cutting the glass wool and reducing the thickness of the core material occurring at the bent portion. Falls. In recent years, glass wool-containing core materials of glass fibers have problems with environmental loads in consideration of dust effects on the human body, reduction of CO ₂ emissions, and recycling type eco recycling.

In the vacuum heat insulating material of the said patent document 2, environmental load is small and it is excellent in recycling property. However, since the core material has a polar group of an ester bond in a molecule | numerator in a polyester fiber, water absorption shows a high value about 0.4 to 0.5%. In the vacuum heat insulating material, most of the total gas amount after decompression is water, and moisture in the air is gradually adsorbed (hygroscopic) while assembling the core material of the polyester fiber. Since the amount of moisture in the core material greatly affects the thermal conductivity, a management process for preventing the removal of moisture and the resorption of moisture is necessary immediately before assembling the vacuum insulator.

Moreover, in the vacuum heat insulating material using the core material of polyester fiber, heat conductivity is high as 3 kPa / m * K or more, as described in the specification, and heat insulation performance falls. The glass wool used for the present product uses ultrafine fibers having an average fiber diameter of 3 to 5 µm, and has a low thermal conductivity of about 2 mW / m · K. Therefore, even the vacuum heat insulating material of new organic fiber can obtain the heat insulation performance similar to glass wool. As a reason, for example, when the vacuum heat insulating material of polyester fiber which is low in heat conductivity is mounted in a refrigerator etc., the subject that the amount of heat leakage of a refrigerator is high and the reduction of power consumption is small arises.

In addition, although the content of the bending of a vacuum heat insulating material is not described, in the core material of polyester fiber, it is difficult to bend along the shape of a to-be-installed part, and if it bends forcibly, a fiber is cut | disconnected and heat insulation by a decrease of the thickness of a vacuum heat insulating material in a bend part is carried out. There is a problem of poor performance.

In the vacuum heat insulating material of the said patent document 3, environmental load is small and it is excellent in recycling property. However, in the two kinds of polyester fiber aggregates having different melting points, the core material has a polar group of an ester bond in the molecule, and thus exhibits a high absorption rate of about 0.4 to 0.5%. In the vacuum heat insulating material, most of the total gas amount after decompression is water, and moisture in the air is gradually adsorbed (hygroscopic) until the core material of the polyester fiber is assembled. Since the amount of moisture in the core material greatly affects the thermal conductivity, a management process for preventing the removal of moisture and the resorption of moisture is necessary immediately before assembling the vacuum insulator.

In addition, the fiber aggregate is processed into a sheet shape by a thermal bond method, and the low melting polyester fiber is subjected to a heating treatment of 110 to 170 ° C and the high melting polyester fiber is 20 ° C or more. In the vacuum insulator of two kinds of polyester fibers, as described in the specification, all of the thermal conductivity is higher than 4 mW / m · K and higher, and the heat insulating performance is inferior. Glass wool used in current products is an ultrafine fiber having an average fiber diameter of 3 to 5 µm and a low thermal conductivity of about 2 mW / m · K. Therefore, even the vacuum heat insulating material of new organic fiber can obtain the heat insulation performance similar to glass wool. As a reason, for example, when the vacuum heat insulating material of polyester fiber which is low in heat conductivity is mounted in a refrigerator etc., the subject that the amount of heat leakage of a refrigerator is high and the reduction of power consumption is small arises.

In addition, although the content of the bending of a vacuum heat insulating material is not described, in a polyester fiber core material, it is difficult to bend along the shape of a to-be-installed part, and if it bends forcibly, a fiber is cut | disconnected and heat insulation of a vacuum heat insulating material is reduced by thickness reduction at a bending part. There is a problem of poor performance.

In the vacuum heat insulating material of the said patent document 4, environmental load is small and it is excellent in recycling property. However, in the sheet-like fiber aggregates containing 50 wt% or more of polyester fibers having 1 to 6 denier polyester fibers, the core material has a polar group of an ester bond in the molecule, and thus exhibits a high absorption rate of about 0.4 to 0.5%. In the vacuum heat insulating material, most of the total gas amount after decompression is water, and moisture in the air is gradually adsorbed (hygroscopic) until the core material of the polyester fiber is assembled. Since the amount of moisture in the core material greatly affects the thermal conductivity, a management process for preventing the removal of moisture and the resorption of moisture is necessary immediately before assembling the vacuum insulator.

In addition, other fibers contained in the polyester fiber aggregates include polyethylene, polypropylene, acrylic, aramid, nylon, polyvinyl alcohol, polyurethane synthetic fibers, inorganic fibers, natural fibers, and the like. As described in the specification, all of the thermal conductivity is inferior in thermal insulation performance to 3 kW / m · K or more. In the glass wool used for the present product, the thermal conductivity of the ultrafine fibers having an average fiber diameter of 3 to 5 µm is low as about 2 mW / m · K. Therefore, even the vacuum heat insulating material of new organic fiber can obtain the heat insulation performance similar to glass wool. As a reason, for example, when the vacuum heat insulating material of polyester fiber which is low in heat conductivity is mounted in a refrigerator etc., the subject that the amount of heat leakage of a refrigerator is high and the reduction of power consumption is small arises.

In addition, although the content of bending of a vacuum heat insulating material is not described, bending in the fiber core material of polyester is difficult to bend along the shape of a to-be-installed part, and if it bends forcibly, the fiber will be cut | disconnected and the thickness of a vacuum heat insulating material may be reduced by the bending part. It has a problem of poor thermal insulation performance.

In the vacuum heat insulating material of the said patent document 5, environmental load is small and it is excellent in recycling property. However, the core material is a sheet-like fiber assembly made of organic fibers, the thickness of the core material after vacuumization is 0.1 to 5 mm, and the packing bag of the gas adsorbent material is a nonwoven fabric made of polyester fiber, the core material is polyester fiber, and the polar group of the ester bond in the molecule. Since it has a water absorption, it shows a high value with about 0.4 to 0.5%. In the vacuum insulator, most of the total gas amount after decompression is water, and the packaging bag and the core material of the polyester fiber gradually adsorb (moisture) moisture in the air until they are assembled. Since the amount of moisture in the core material greatly affects the thermal conductivity, a management process for preventing the removal of moisture and the resorption of moisture is necessary immediately before assembling the vacuum insulator.

Moreover, when the thickness after evacuation of a vacuum heat insulating material is 0.1-5 mm, it is very thin and heat insulation is inadequate, and as described in the specification, all the thermal conductivity shows a high value of 4 kW / m * K or more. In the glass wool used for the present product, the thermal conductivity of the ultrafine fibers having an average fiber diameter of 3 to 5 µm is low as about 2 mW / m · K.

Therefore, even the vacuum heat insulating material of new organic fiber can obtain the heat insulation performance similar to glass wool. As a reason, when the vacuum heat insulating material of a thin polyester fiber is mounted in a refrigerator etc., the problem of insufficient heat insulation will arise. In the vacuum insulator of glass wool, in terms of power consumption, the thickness after vacuuming is usually about 10 mm. Although it is excellent in bendability in a thin vacuum heat insulating material, when used for the heat insulating material of a refrigerator, there exists a subject that the effect of reducing power consumption is small.

An object of the present invention is excellent in the environment consisting of carbon and hydrogen, the low-hygroscopic polystyrene long filament web as a core material of the vacuum insulation material, the heat conductivity (2 kW / m · K) equivalent to the case of using glass wool It is providing the high-performance vacuum heat insulating material shown. In addition, conventionally, when glass wool or polyester fiber is used, thermal conductivity, bendability, water removal, dust accuracy, and CO ₂ emissions, which have both problems of environmental load and thermal insulation, have been improved, and a vacuum insulation material capable of circulating eco recycling is possible. To provide thermal insulation boxes and refrigerators.

In order to solve the said subject, this invention mainly employ | adopts the following structures.

A vacuum insulator comprising a core material made of an organic fiber assembly, a getter agent for adsorbing gas or water vapor, and an outer cover material having gas barrier properties for accommodating the core material and the getter agent, and vacuum-sealing the inside of the outer cover material. The core material has a long fiber web formed by melting spinning a material excellent in an environment composed of carbon and hydrogen and having low hygroscopicity. The core material is a general-purpose polystyrene resin, and the polystyrene resin is formed by melt spinning of melt-blown and / or spunbond. Moreover, the average fiber diameter of a core material is 8 micrometers-20 micrometers, and the density of the said core material is set to 150-300 kg / m <3>.

In addition, in the space formed by the outer box and the inner box, a vacuum insulating material is installed and a heat insulating box filled with a foamed heat insulating material, the vacuum heat insulating material is a getter agent which adsorbs the core material, gas or water vapor made of an organic fiber assembly, The core material and an outer cover material having gas barrier properties for accommodating the getter agent are formed, and the inside of the outer cover material is vacuum sealed, and the core material of the vacuum insulator has a long fiber web made of polystyrene resin. The vacuum insulator is provided on the outer box or the inner box in which the space is formed. Moreover, the said vacuum heat insulating material is provided by bending in the corner part where two surfaces of the said outer box or the said inner box cross | intersect.

According to the present invention, by providing a new core material of a long fiber web made of polystyrene material which is excellent in an environment composed of carbon and hydrogen, a high-performance vacuum insulation material exhibiting a thermal conductivity (2 kW / m · K) equivalent to that of glass wool vacuum insulation is provided. can do.

In addition, as a vacuum insulator that achieves both thermal insulation performance and environmental load, which is a problem in glass wool or polyester fibers, a vacuum insulator capable of circulating eco-recycling with improved thermal conductivity, bendability, water removal, and CO ₂ emissions, and Used heat insulation boxes and refrigerators can be provided.

About the vacuum heat insulating material which concerns on embodiment of this invention, the structural characteristic, its function, or operation | movement are demonstrated in detail below. BRIEF DESCRIPTION OF THE DRAWINGS It is sectional drawing which shows the structure of the vacuum heat insulating material which concerns on embodiment of this invention. In FIG. 1, code | symbol 1 is a vacuum heat insulating material, code | symbol 2 is an outer cover material, code | symbol 3 is a core material of polystyrene long fiber, and code | symbol 4 shows a getter agent, respectively.

First, about the vacuum heat insulating material which concerns on embodiment of this invention, the characteristic is demonstrated one by one from a viewpoint of heat insulation performance and environmental load. The characteristic of this embodiment is the vacuum heat insulating material which has the core material of organic fiber, a getter agent (it absorbs gas and water vapor | steam, mentioned later), and an outer cover material, and the outer cover material is pressure-sealed and sealed, The organic fiber is carbon and hydrogen. The long fiber web of polystyrene material which is excellent in the environment which consists of is arrange | positioned. The core material of a vacuum heat insulating material has the function of the spacer which keeps its shape from atmospheric pressure, and the fiber which has a high space | gap even if it receives the compressive stress at the time of pressure reduction is preferable. In addition, since thermal conductivity, which is an index of thermal insulation performance, varies greatly depending on the type of core material, a core material of polystyrene fiber is newly selected as a high-strength fiber body having low general purpose and low hygroscopicity.

The polystyrene used in the present embodiment is preferably a polystyrene which is a general-purpose product having a benzene ring of a side chain having a large volume, rigid and difficult to be entangled, and having a flexural modulus of about 3000 MPa or more. Polystyrene has a hydrophobic nonpolar group, low hygroscopicity, and molecular weight is preferably about 200,000 to 400,000 without limitation as long as it is fibrous. For example, when general-purpose polyethylene or polypropylene fibers are used instead of polystyrene fibers, the hygroscopicity is low, but the bending elastic modulus is low, so the creep phenomenon is large. It is high in f / m * K or more, and heat insulation performance is inferior.

As the state of the fibers, the shorter length in the point fiber aggregates, such as short fibers, increases the thermal conductivity, so that the average fiber diameter is about 20 µm or less, especially 5 to 20 µm, in a continuous long fiber (continuous non-uniform length of fibers). It is preferable from a viewpoint of heat conductivity. For example, since the strength of the fiber is proportional to the sum of the square of the fiber diameter and the Young's modulus, when the long diameter is 1/2, the strength decreases to 1/16, which is very soft, and is preferably about 5 µm or more.

On the contrary, when the fiber diameter becomes too large, the contact of the fibers is close to the line, the thermal conductivity is increased by the reduction of the contact thermal resistance, and about 20 µm or less is preferable. In addition, the average fiber diameter measured the fiber diameter of the visual field containing about 10 fiber using the scanning electron microscope.

Moreover, when the density of a core material is 150 kg / m <3> or less, the intensity | strength of a core material falls and there exists a tendency for heat conductivity to become high. On the contrary, it becomes heavy at 300 kg / m <3> or more, and thermal conductivity becomes high from a viewpoint of porosity. That is, even if the density of a core material is too light or too heavy, there exists a tendency for heat insulation to fall, and the said preferable average fiber diameter is 150-300 kg / m <3>. In addition, the density of the core material was the density after the vacuumization accommodated in the outer cover material, and the density was calculated from the weight of the core material and the volume of the vacuum insulator after the weight of the outer cover material and the getter agent was subtracted from the weight of the vacuum insulator.

The formation of the organic fiber aggregate is a long fiber web in which polystyrene resin is extruded from a nozzle by melt spinning and directly formed by stretching. Polystyrene fibers are spun at an extrusion temperature of about 200 to 320 DEG C, a low temperature increases extrusion torque, and a high temperature tends to gel and difficult to fiberize. The long fiber aggregate is preferably a core material which is not adhesively bonded with a thermal bond, a needle punch, or the like, and is formed and collected to form an oriented web.

Specifically, the polystyrene is extruded from the tip of the nozzle by melt blown, the fibers are stretched by the injection of air and collected on the collector to form a web. In the spunbond, it is continuously extruded from a plurality of spinning nozzle tips, and the fibers are collected on the collector from the ejector by the injection of air to similarly form a web. In addition, the fiber shape is not limited to a circular shape, and may be a substantially circular shape, approximately Y shape, approximately ellipse shape, approximately star shape, approximately polygon shape, or the like. Aggregates can be provided. Naturally, even if the above-mentioned long fiber web is used alone or in combination using polystyrene resin of a recycling material, it can be used for a vacuum heat insulating material. Moreover, in order to further heat up the vacuum heat insulating material of polystyrene long fiber, it is also possible to use it together with the long fiber (for example, polycarbonate, polysulfone, etc.) with a high deformation | transformation temperature together in a skin layer part, etc., and to use.

In the vacuum heat insulating material which used the polystyrene long fiber for the core material, compared with the core material of glass wool or polyester fiber, it is possible to deform | transform a bending part while heating, and the vacuum heat insulating material which can be shape-bending is obtained. As a reason, polystyrene fibers are amorphous and tend to be softened near the glass transition temperature.

On the other hand, glass wool is difficult to bend, and polyester fibers are crystalline, and even near the glass transition temperature, softening by heating is difficult because chain molecules in the amorphous region are connected to and bound to the crystal region. That is, amorphous polystyrene tends to be softened near the glass transition temperature, and crystalline polyester hardly softens to the temperature at which crystals melt even near the glass transition temperature. Since the organic fiber has a Young's modulus and intensity | strength falling in the vicinity of glass transition temperature by elongation, and elongation increases, shape bending by heating tends to become easy.

In addition, in the core material of glass wool or polyester fiber, the absorbency is high and the influence on the thermal conductivity is remarkable. For example, the glass wool is dried at about 300 ° C. before being inserted into the envelope, and at about 120 ° C. for polyester fiber. Of the polystyrene fiber of the present embodiment is indispensable. On the other hand, the drying treatment is not particularly necessary because the water absorption is low.

The outer cover material is the material structure which covers the core material which provides an airtight part inside, and the material which reflects the shape of a core material by pressure reduction sealing is preferable. For example, when a rigid material having high rigidity is used, bending becomes difficult and causes pinholes after bending. Therefore, what makes a laminated film into a bag shape as an outer cover material is used. The outermost layer for impact, the intermediate layer for ensuring gas barrier properties, and the innermost layer that can be sealed by heat fusion are preferred.

By using a polyamide film in the outermost layer, the puncture resistance is improved, and an ethylene vinyl alcohol copolymer film having an aluminum deposition layer is provided in the middle layer, and the innermost layer includes high density polyethylene, linear low density polyethylene, and high density polypropylene. High density polyethylene is preferable from sealing property and chemical attack property. For example, specifically, an ethylene vinyl alcohol copolymer having polyethylene terephthalate in the outermost layer, aluminum foil in the middle layer, and a plastic laminate film made of high density polyethylene in the innermost layer, polyethylene terephthalate in the outermost layer, and an aluminum deposition layer in the middle layer, It is a plastic laminate film which consists of high density polyethylene in an innermost layer.

Getters are used to improve the reliability of vacuum insulators. The getter agent may absorb gas such as carbon dioxide, oxygen, nitrogen, or water vapor, and may be a getterite, hydrotalcite, a metal hydroxide getter agent, or molecular, silica gel, calcium oxide, zeolite, hydrophobic zeolite, activated carbon, Absorbents of potassium hydroxide and lithium hydroxide are used. At this time, since pinholes are likely to occur in the outer cover material due to perforation by a getter-protrusion, the pinhole generation of the outer cover material can be suppressed by being used by being used in a polystyrene long fiber.

The above-mentioned vacuum heat insulating material can be used for the refrigerator etc. which have a heat insulation box body. A refrigerator and the like make a space with an outer box and an inner box, and the foamed resin foam is filled in the space, and the vacuum insulator can be inserted into the space filled with the foamed resin foam. In the method of inserting the vacuum insulator and the foamed resin, a vacuum insulator is installed in the space formed by the inner box and the outer box in advance, and thereafter, the foamed resin foam is injected and integrally molded, or the vacuum insulator and the foamed resin foam are pre-formed. There is a method of fabricating an integrally formed vacuum insulator and attaching the vacuum insulator to an inner box or an outer box, or sandwiching the both. These methods are suitably used depending on the article requiring thermal insulation performance.

The above-mentioned vacuum heat insulating material can be applied to each product which needs insulation and cold storage. Examples include refrigerators, vehicles, building materials, automobiles, medical devices, and the like. In particular, it is effective in the whole product which needs heat insulation including heat exchange part. By applying the vacuum insulator of the present invention to a refrigerator, it is possible to improve the thermal insulation and cold storage function, and to reduce the amount of heat leakage and to save energy. Refrigerators and the like include vending machines, product showcases, cold storage boxes, cooler boxes, and the like, in addition to refrigerators and freezers for home and business use. Moreover, by applying to a vehicle, the space inside a vehicle can be enlarged by installation of a space-saving vacuum heat insulating material, and it can be expected to solve sufficient problems, such as dew condensation, by giving sufficient heat insulation effect.

Next, the structure and manufacturing method regarding the vacuum heat insulating material which concerns on embodiment of this invention, and the refrigerator which applied this are demonstrated below, referring FIGS. BRIEF DESCRIPTION OF THE DRAWINGS It is sectional drawing which shows the structure of the vacuum heat insulating material which concerns on embodiment of this invention. 2 is a cross-sectional view showing the configuration of a vacuum insulator in the prior art. 3 is a cross-sectional view showing the configuration of a heat insulating box in which the vacuum heat insulating material according to the present embodiment is applied. 4 is a cross-sectional view showing the configuration of a refrigerator to which the vacuum insulator according to the present embodiment is applied. It is a figure which shows the attribute compared with the comparative example about the some Example which is a specific example of the vacuum heat insulating material which concerns on embodiment of this invention.

In the drawings, reference numeral 1 denotes a vacuum insulation material, numeral 2 denotes an outer material, numeral 3 denotes a core material of polystyrene long fiber, numeral 3 'denotes a core material bent portion, numeral 4 denotes a getter agent, numeral 5 denotes glass wool or polyester fiber , 6 is a conventional vacuum insulation material, 7 is a heat insulating box, 8 is a rigid polyurethane foam, 9 is a box, 10 is a refrigerator, 11 is a refrigerator inner box, 12 is a refrigerator outer box, respectively. Indicates.

The vacuum heat insulating material 1 which concerns on this embodiment is a thing of the structure which pressure-sealed with the outer cover material 2 with the getter agent 4 to the core material (core material) 3 of polystyrene long fiber. According to the vacuum heat insulating material 1 of this embodiment, using the core material 3 of polystyrene long fiber, the flat vacuum heat insulating material 1 of low thermal conductivity which can balance heat insulation performance and environmental load is obtained. Further, the vacuum insulator 1 is bent while being heated at about 60 to 80 ° C. below the welding temperature of the outer cover material 2, thereby reducing the deformation into the outer cover material 2 and having a low thermal conductivity. ) Can also be produced. As a result, the vacuum heat insulating material 1 of planar shape and bending shape is combined, and the excellent vacuum heat insulating material 1 which can be used for a box and a refrigerator is provided.

In addition, the cross-sectional schematic diagram of the conventional vacuum heat insulating material 6 is shown in FIG. It is a vacuum heat insulating material of the structure which seals the core material of glass wool and the core material 5 of polyester fiber with the getter agent 4 by pressure-sensitive sealing material 2. Conventional vacuum insulator 6 has good thermal insulation in glass wool, but has low environmental load, and has good environmental load in polyester fiber, but has poor thermal insulation, and a core material having both heat insulating performance and environmental load is not obtained. Bendability is difficult with glass wool or polyester fiber, and if it is forcibly bent, pinholes caused by thickness reduction or thinning of the outer part of the outer cover material 2 are likely to occur at the cutting or bending portion of the fiber, and thermal insulation with a vacuum insulator Worsen performance.

The perspective schematic diagram of the heat insulation box 7 provided with the vacuum heat insulating material 1 of this embodiment is shown. The heat insulation box 7 inserts the vacuum heat insulating material 1 in which the polystyrene long fiber was inserted into a part of the inner surface side of the box body 9 which press-formed the iron plate, and hard polyurethane foam 8 in the space | gap part. It is of the structure which foam-filled. When manufacturing the vacuum heat insulating material 1, the bending-shaped vacuum heat insulating material which bend | folded a part of core material 3 at the heating part 3 'is used.

A vacuum insulation panel according to the present embodiment is fabricated by changing the conditions such as a sheet of polystyrene fiber, it was confirmed that the thermal conductivity and the thermal conductivity change with time of v. Gokseong, water removal, CO ₂ emissions, the echo recycling. Moreover, the thing using the fiber core materials other than a polystyrene long fiber was produced as the 1st comparative example-the 4th comparative example, and it confirmed similarly. The result of the confirmation is shown in FIG.

According to FIG. 5, the 1st Example-5th Example which is a specific example of the vacuum heat insulating material which concerns on this embodiment is taken as an example compared with the 1st Comparative Example-4th Comparative Example, and these are demonstrated concretely below.

"1st Example"

The flat vacuum insulating material of this embodiment was produced as follows. Using a general-purpose polystyrene resin (molecular weight: about 200,000, bending elastic modulus: about 3000 MPa), spunbonded polystyrene was continuously extruded at a temperature of about 290 ° C while passing through a plurality of nozzle tips, and then The fibers were collected on the collector from the controlled ejector to form a substantially circular long fiber web. Its average fiber diameter is about 15.6 μm and its density is about 230 kg / m 3.

In addition, the core material of the long-fiber web formed in the outer cover material which consists of a gas barrier film was piled up, and the getter agent (molecular 13X) of gas adsorption was inserted, and the rotary pump of a vacuum packaging machine was used for 10 minutes by the diffusion pump. After evacuating to a vacuum chamber for 10 minutes until the internal pressure of the chamber was 1.3 kPa, the end portion of the envelope was vacuum sealed with a heat seal.

The thermal conductivity of the obtained vacuum heat insulating material (size: 500 mm x 500 mm x 10 mm) was measured at 10 ° C using AUTO-A manufactured by Eiko Seiki Co., Ltd. The thermal conductivity was 2.5 kW / m · K and the vacuum insulator was left in a 60 ° C. thermostatic chamber for 30 days, and the thermal conductivity was measured again to be 4.2 kW / m · K. From this, in the vacuum insulator having a long-fiber web of polystyrene, it is possible to provide a high-performance vacuum insulator which is excellent in environmental load and low in hygroscopicity and maintains gas barrier properties and internal vacuum degree.

`` First Comparative Example ''

Instead of the polystyrene fibers of the first embodiment, the polyester fiber aggregate (average fiber diameter: about 16.5 mu m, density: about 180 kg / m 3) has high hygroscopicity, and thus has been subjected to water removal (120 DEG C / 1h drying). Using ash, it is put together with the gas adsorption getter (molecular 13X) in a gas barrier outer cover material, and it is put into a vacuum chamber for 10 minutes by a rotary pump of a vacuum packaging machine, 10 minutes by a diffusion pump, and the inside of a chamber. After evacuating until the pressure became 1.3 kPa, the end portion of the outer cover was heat sealed to prepare a vacuum insulator (size: 500 mm × 500 mm × 10 mm) by vacuum sealing. Thus, the vacuum heat insulating material similar to the 1st Example obtained was 8.2 kW / m * K as a result of re-measuring the heat conductivity after leaving heat conductivity 4.2 kPa / m * K and vacuum heat insulating material in a 60 degreeC thermostat for 30 days.

From this, in the core material using polyester fiber, problems with environmental loads (dust degree, CO ₂ emission, eco recycling) are not seen, but the thermal conductivity is high in the vacuum insulator in which the hygroscopicity is high and the gas barrier property and internal vacuum degree are lowered. It is high, and the fall of insulation performance is seen.

"2nd Example"

The bent vacuum insulator of this embodiment was produced as follows. Using a general-purpose polystyrene resin (molecular weight: about 300,000, bending elastic modulus: about 3200 MPa), the polystyrene is continuously extruded at a temperature of about 260 DEG C while passing polystyrene from the nozzle tip by melt blown spinning, and the fiber is blown by air. Was stretched to form an approximately Y-shaped long fiber web collected on the collector. The average fiber diameter is about 8.0 μm and the density is about 150 kg / m 3.

In addition, the core material of the long-fiber web formed in the gas-barrier outer cover material was piled up, and the gas adsorption getter agent (hydrophobic zeolite HiSiv-3000) was inserted, 10 minutes by the rotary pump of a vacuum packaging machine, 10 minutes by the diffusion pump, After evacuating to a vacuum chamber until the internal pressure of the chamber was 1.3 kPa, the end of the outer cover was heat sealed to obtain a vacuum insulator (size: 500 mm × 500 mm × 10 mm) by vacuum sealing. Thereafter, a vacuum insulator was inserted into a support indenter of a baking tester, and a bent vacuum insulator was produced while being heated at a temperature of about 60 to 80 ° C.

The thermal conductivity was measured and found to be 2.0 mA / m · K. In addition, in order to evaluate the bendability, using a baking tester, test conditions (speed of 10 mm / min, round bar with 100 mm between support points and support and indenter ø20 mm), maximum bending at displacement amount of 40 mm The load N was measured. As a result, the bendability was as low as 70.5 N, and the thermal conductivity after leaving the vacuum insulator in the thermostatic bath at 60 ° C. for 30 days was re-measured to be 3.2 kW / m · K.

From this, the deterioration of thermal conductivity is suppressed even if it is bent in the vacuum heat insulating material which has a long fiber web of polystyrene. The bent shape vacuum insulator does not apply excessive stress to the cover material even when it is bent to reflect the heated core material, thereby providing a high-performance vacuum insulator having excellent thermal conductivity.

"2nd comparative example"

Instead of the polystyrene fibers of the second embodiment, the polyester fiber aggregate (average fiber diameter: about 17.2 µm, density: about 210 kg / m 3) has high hygroscopicity, so that the core subjected to water removal (120 ° C./1 h drying) is treated. The ash was used together with a gas adsorption getter agent (hydrophobic zeolite HiSiv-3000) in a gas barrier envelope, 10 minutes with a rotary pump of a vacuum packaging machine, 10 minutes with a diffusion pump, and into a vacuum chamber. After evacuating until the pressure became 1.3 kPa, the end portion of the envelope was vacuum sealed with a heat seal to obtain a vacuum insulator (size: 500 mm × 500 mm × 10 mm).

Thereafter, a bent vacuum insulator was formed while being heated in a baking tester as in the second embodiment, but it was difficult to bend. Moreover, as a result of measuring the maximum bending load N as in the second embodiment, the bendability was 120 N and the thermal conductivity was 5.2 kPa / m · K. Then, after leaving a vacuum heat insulating material for 30 days in a 60 degreeC thermostat, after measuring heat conductivity again, it became high to 9.5 kPa / m * K.

From this, since it is difficult to bend in the core material of polyester fiber, stress is applied to the core material and outer cover material of a vacuum heat insulating material, and deterioration of heat insulation performance is seen by the deterioration of thermal conductivity with time due to gas barrier property and internal vacuum degree fall.

"Third Example"

The flat vacuum insulating material of this embodiment was produced as follows. An average of approximately Y shapes formed by melt blown spinning using a general-purpose polystyrene resin, and a long-fiber web having a general circular diameter of about 20 µm formed by spunbond spinning and a general purpose polystyrene resin. Both of the long fiber webs having a fiber diameter of about 9.2 mu m were used for the core material. The density is about 300 kg / m 3. First, by using an inner bag of thin polyethylene or the like, both long fiber webs formed by spunbond spinning and meltblown spinning were put together with a gas adsorption getter agent (molecular 13X), and then air-sealed. In addition, after opening the inner bag by inserting it into the gas barrier material, immediately 10 minutes with the rotary pump of the vacuum packaging machine, 10 minutes with the diffusion pump, put into the vacuum chamber and evacuated until the internal pressure of the chamber is 1.3 kPa The edge part of the outer cover material was vacuum-sealed with a heat seal, and the vacuum heat insulating material (size: 500 mm x 500 mm x 10 mm) was produced.

In addition, in the third embodiment, an inner bag which does not affect the thermal conductivity is used as a very easy method for inserting the core material into the outer cover material. The thermal conductivity was measured and found to be 2.4 kV / m · K, and the vacuum insulator was placed in a 60 ° C. thermostatic chamber and allowed to stand for 30 days, after which the thermal conductivity was measured again.

From this, even in the vacuum insulator using two kinds of polystyrene long fibers having different fiber diameters, the hygroscopicity is low, the gas barrier property and the vacuum degree inside can be maintained, and a high-performance vacuum insulator can be provided.

"Fourth Example"

The flat vacuum insulator (size: 500 mm x 500 mm x 10 mm) of the third embodiment was inserted into the support indenter of the baking tester, and the bent vacuum insulator was heated at a temperature of about 60 to 80 ° C. Produced. As a result of measuring the thermal conductivity, the thermal conductivity was 2.8 kW / m · K, and the thermal conductivity was approximately equal to that of the flat vacuum insulator.

In addition, as an evaluation of the bendability, using a baking tester, test conditions (heating a round bar having a speed of 10 mm / min, a distance between the supporting points of 100 mm and a support and an indenter of ø20 mm), and a maximum bending load at a displacement of 40 mm ( N) was measured. As a result, the bendability was low at 72.9 N, and the thermal conductivity after leaving the vacuum insulator in the thermostatic bath at 60 ° C. for 30 days was re-measured and found to be 4.4 mW / m · K.

From this, even in the vacuum heat insulating material which has two types of polystyrene long fiber webs, even if it is bent, deterioration of thermal conductivity is suppressed. The bent shape vacuum insulator does not apply excessive stress to the cover material even when it is bent to reflect the heated core material, thereby providing a high-performance vacuum insulator having excellent thermal conductivity.

"5th Example"

The flat vacuum insulating material of this embodiment was produced as follows. Polystyrene resin (molecular weight: about 230,000, bending elastic modulus: about 3500 MPa) of recycled material is continuously extruded at a temperature of about 300 DEG C while passing through a plurality of nozzle ends by spunbond spinning from a tray of a refrigerator, etc. The fibers were collected on the collector from the ejector controlled by using a long fiber web having an approximately circular average fiber diameter of about 14.2 μm. The density of the core material is about 210 kg / m 3.

In addition, the core material of the long-fiber web formed in the gas-barrier outer cover material was piled up, and the gas adsorption getter agent (molecular 13X) was inserted, 10 minutes by the rotary pump of a vacuum packaging machine, 10 minutes by the diffusion pump, It was put in a vacuum chamber and exhausted until the pressure inside the chamber became 1.3 kPa, and the end portion of the outer packaging material was vacuum sealed with a heat seal. The thermal conductivity of the vacuum insulator (size: 500 mm × 500 mm × 10 mm) obtained in this way was 2.6 kPa / m · K, and after the vacuum insulator was left for 30 days in a 60 ° C. thermostat, the thermal conductivity was measured again. / M · K.

From this, in the vacuum heat insulating material using the polystyrene long fiber of a recycled material, since the hygroscopicity is low and gas barrier property and the vacuum degree inside are maintained, the high performance vacuum heat insulating material excellent in thermal conductivity can be provided.

"Sixth Example"

As shown in FIG. 4, the 6th Example of this embodiment is an example which used the vacuum heat insulating material of this embodiment for a refrigerator. The refrigerator is insulated by vacuum insulator and other insulators. In the refrigerator, it is the outer peripheral side of the compressor peripheral part and the inner box of the back of a refrigerator that the temperature difference with outside air temperature is especially large. It is effective to use the vacuum heat insulating material 1 of this embodiment for this site | part. As a vacuum insulator, the core material of polystyrene long fiber was provided, and what was produced combining the deformation | transformation part and the flat part was used.

A vacuum heat insulating material is a vacuum heat insulating material arrange | positioned along the bending part of a heat insulating wall. When installing a vacuum heat insulating material in the inner box side of a bending part, it is provided so that it may adhere to an inner box along the shape of an inner box. In addition, the vacuum heat insulating material is provided along the shape of an outer box, when installing in the outer box side of a bending part. The bent portion of the heat insulation wall is a portion constituting the deformation portion of the heat insulation wall. Moreover, the vacuum heat insulating material is arrange | positioned also in one of the back part of an outer box, and a refrigerator door (refer FIG. 4).

Polyol and isocyanate were injected and filled into a box using a high pressure foaming machine, and the heat insulating material of the refrigerator was produced. The rigid polyurethane foam of a foam insulation is a polyol, 40 weight part of polyether polyol which added propylene oxide to m-tolylenediamine which has an average hydroxyl value of 450, and propylene oxide to ortho- tolylene diamine which has an average hydroxyl value of 470. 30 parts by weight of a polyether polyol added thereto, 100 parts by weight of a mixed polyol component of 30 parts by weight of a polyether polyol having propylene oxide added to o-tolylenediamine having an average hydroxyl value of 380, and 15 parts by weight of cyclopentane 1.5 parts and 1.2 parts by weight of tetramethylhexamethylenediamine and 2 parts by weight of trimethylaminoethylpiperazine as the reaction catalyst, 2 parts by weight of the organosilicon compound X-20-1614 as a foam stabilizer, and isionate as an isocyanate component. Foam packing was carried out using 125 parts of MR diphenylmethane isocyanate polynuclear bodies.

The amount of heat leakage and power consumption of the refrigerator after heat insulation were measured. The amount of heat leakage of the refrigerator was measured as the amount of heat leakage from the inside of the refrigerator by setting a temperature condition opposite to the operating state of the refrigerator. Specifically, a refrigerator was installed in a constant temperature room at -10 ° C, and the internal temperature of the high temperature was supplied to the heater so as to be a predetermined measurement condition (temperature difference), and the temperature was measured under temperature conditions for comparing the power consumption and cooling performance of the refrigerator. The power consumption of the refrigerator was performed based on JIS measurement standard.

As a result, compared with the refrigerator which did not insert a vacuum insulator, the refrigerator which can reduce 8.5% by the amount of heat leakage and 12% by the amount of power consumption was able to be provided. In addition, the above-mentioned rigid polyurethane foam can be used for a refrigerator and a heat insulation box with the vacuum heat insulating material 1 of this embodiment, and although phenol foam, a styrene foam, etc. are illustrated besides a rigid polyurethane foam, cyclopentane And rigid polyurethane foams having water as a mixed blowing agent.

"Seventh Example"

7th Example of this Embodiment is an example using a vacuum heat insulating material as a heat insulating material of the vehicle of a double skin structure material. In a vehicle having a double skin structure, in order to reduce weight and improve pressure resistance, the side surface and the roof structure have a curved surface, and it is difficult to attach in a conventional vacuum insulator. Moreover, when attached, a deformation | transformation generate | occur | produces in an outer cover material, the vacuum degree inside deteriorates and heat insulation performance falls. The vacuum insulator had a core material of a polystyrene long fiber web, and was produced by combining the shapes by bending them into a flat plate shape.

When the vacuum heat insulating material 1 of this embodiment was used, it became possible to adhere along the curved surface of a structure, and it had the heat insulation effect of a vehicle, and the problem, such as dew condensation in a vehicle, did not arise either. Moreover, it is a vacuum heat insulating material which is excellent in heat insulation characteristics, and also shows the effect that the indoor space of a vehicle becomes wider by reducing the thickness of a heat insulating material, and the vacuum heat insulating material of this embodiment is effective also as a vehicle heat insulating material.

"Eighth Embodiment"

8th Example of this embodiment is an example using a vacuum heat insulating material as a heat insulating material of a vending machine. In order to save energy and improve the space volume, the vending machine has a flat plate vacuum insulator on its side and a bent vacuum insulator on its lower surface, which is difficult to bend in a conventional vacuum insulator, Deformation occurs, the degree of vacuum inside is lowered, and the thermal insulation performance is deteriorated.

Therefore, in Example 8, the vacuum heat insulating material 1 has the core material which used the long fiber web of polystyrene, and used what was produced by combining the shape by bending to flat form.

By using the vacuum heat insulating material 1 of this embodiment, it is possible to adhere along the curved surface of a structure, and a rigid polyurethane foam is filled in a box like a refrigerator. Since the vacuum insulator is excellent in heat insulation characteristics because the vacuum degree inside does not fall in both a flat plate and a bend shape, energy saving and space volume are improved, and the vacuum heat insulator of this invention is effective also as a heat insulating material for vending machines.

`` Third Comparative Example ''

Instead of the polystyrene fibers of the first and second embodiments, the glass wool aggregate (density: 250 kg / m 3) having an ultrafine fiber and an average fiber diameter of 4.1 μm has high hygroscopicity, so that moisture is removed (about 300 ° C./1 h drying). Using the core material treated in the above), the gas-barrier-containing shell material was put together with a gas adsorption getter agent 4 (molecular 13X), and 10 minutes by a rotary pump of a vacuum packaging machine and 10 minutes by a diffusion pump. It put in the vacuum chamber, and it exhausted until the internal pressure of the chamber became 1.3 kPa, and heat-sealed the edge part of the outer cover material, and produced the vacuum heat insulating material (size: 500 mm x 500 mm x 10 mm) by vacuum sealing.

Thus obtained flat vacuum insulator had a thermal conductivity of 2.0 kW / m · K, and after being left in a 60 ° C. thermostat for 30 days, the thermal conductivity was remeasured and was excellent at 3.2 kW / m · K. However, although a bent shape vacuum insulator was formed, it was difficult to bend, and as a result of measuring the bendability in the same manner as in the second and fourth examples, the maximum bending load was as high as 134 N.

From this, in the core material using glass wool, the thermal conductivity is low and the heat insulating performance is excellent by introducing a drying step of removing water. However, there is a problem that shape bendability and environmental load (dust degree, CO ₂ emission, eco recycling) are inferior.

`` 4th comparative example ''

Instead of the polystyrene fibers of the first and second embodiments, a getter for gas adsorption on a gas barrier envelope using a core material of a polypropylene fiber aggregate (average fiber diameter: 16.5 mu m, density: 180 kg / m 3) It was put together with (4) (molecular 13X), it was put into a vacuum chamber for 10 minutes with a rotary pump of a vacuum packing machine, 10 minutes with a diffusion pump, and it evacuated until the internal pressure of a chamber became 1.3 kPa, A vacuum insulator (size: 500 mm × 500 mm × 10 mm) was produced by vacuum sealing the end of the ash with a heat seal.

Thus obtained vacuum insulator had a thermal conductivity of 5.8 kW / m · K, and the heat conductivity after standing for 30 days in a 60 ° C. thermostatic bath was re-measured and found to be 10.5 kW / m · K. Further, although a bent vacuum insulator was formed, it was difficult to bend, and as a result of measuring the bendability in the same manner as in the second and fourth embodiments, the maximum bending load was as high as 124N.

From this, the core material using the polypropylene fiber does not show any problems with the environmental load (dust degree, CO ₂ emission, eco recycling), but the core material of the polypropylene fiber is soft and low in porosity, and the internal vacuum degree decreases. High thermal conductivity has a problem of poor thermal insulation performance.

As described above, according to the embodiment of the present invention, by using a long fiber web made of a polystyrene material excellent in an environment composed of carbon and hydrogen as a new core material, the thermal conductivity equivalent to that of vacuum wool of glass wool (2 kW / mK) It can be set as the high-performance vacuum heat insulating material which shows. Moreover, it can be set as the vacuum heat insulating material which can attain both heat insulation performance and environmental load which were the subject in glass wool or polyester fiber. Moreover, the amount of heat leakage and power consumption can be reduced by mounting a vacuum heat insulating material in a refrigerator and foam-filling a rigid polyurethane foam. In particular, a vacuum insulator made of polystyrene long fiber is effective for a heat insulation box or a refrigerator including heat exchange parts such as heat keeping and cooling.

In other words, when the vacuum insulator according to the embodiment of the present invention is put together, the following features are provided. That is, it comprises a core material made of an organic fiber assembly, a getter agent disposed in the core material by adsorbing gas or water vapor, and an envelope material having gas barrier properties for accommodating the core material and the getter agent. In the vacuum heat insulating material which vacuum-sealed inside, the core material has a long fiber web in which the material excellent in the environment which consists of carbon and hydrogen was directly formed (it formed directly by molten spinning). And the following are mentioned as a more preferable structural example. That is, the core material is a material made of carbon and hydrogen is polystyrene resin. Further, the polystyrene resin is a general-purpose product and is formed by melt spinning of meltblown and / or spunbond. Moreover, the average fiber diameter of the said core material is 8 micrometers-20 micrometers, and a density is 150-300 kg / m <3>. Moreover, the long fiber web of the said core material is accommodated in an inside bag, and it is made by pressure-sealing and sealing the inside containing the inside bag in the said outer bag which accommodated this inside bag.

In another embodiment of the present invention, the space formed by the outer box and the inner box is a heat insulating box formed by installing a vacuum heat insulating material and filling a foam heat insulating material, wherein the vacuum heat insulating material has at least polystyrene long fiber web in the core material. And an outer cover material having the gas barrier property containing the core material and the getter agent and sealing the inside under reduced pressure. And the following are mentioned as a more preferable structural example. That is, in the said heat insulation box body, it is set as the structure which installs the said vacuum heat insulating material in the said outer box or the said inner box. Moreover, in the said heat insulation box body, it is set as the structure which bends and installs the said vacuum heat insulating material in the corner part where two surfaces of the said outer box or the said inner box cross | intersect.

1 is a cross-sectional view showing a configuration of a vacuum insulator according to an embodiment of the present invention.

2 is a cross-sectional view showing the configuration of a vacuum insulator in the prior art.

3 is a cross-sectional view illustrating a configuration of a heat insulation box body to which the vacuum heat insulating material according to the present embodiment is applied.

4 is a cross-sectional view showing the configuration of a refrigerator to which the vacuum insulator according to the present embodiment is applied.

The figure which shows the attribute with respect to the some Example which is a specific example of the vacuum heat insulating material which concerns on embodiment of this invention compared with a comparative example.

<Explanation of symbols for the main parts of the drawings>

1: vacuum insulation

2: outer material

3: core material of polystyrene filament

3 ': core material bent portion

4: getter

5: glass wool or polyester fiber

6: conventional vacuum insulation

7: insulation box

8: rigid polyurethane foam

9: box

10: refrigerator

11: refrigerator inner box

12: refrigerator outer box

Claims (9)

A vacuum insulator comprising a core material made of an organic fiber assembly, a getter agent for adsorbing gas or water vapor, and an outer cover material having gas barrier properties for accommodating the core material and the getter agent, and vacuum-sealing the inside of the outer cover material. , The core material is an oriented web of long fibers which is amorphous and directly formed by melt spinning a polystyrene resin softening near the glass transition temperature, The core material has a bending elastic modulus of 3000 MPa or more, and an initial thermal conductivity of 2.0 kPa / m · K to 2.8 kPa / m · K and a thermal conductivity of 3.2 kPa / mK to 4.4 after standing for 30 days in a thermostatic chamber at 60 ° C. It is kPa / m * K, The vacuum heat insulating material characterized by the above-mentioned. The vacuum insulator according to claim 1, wherein the polystyrene resin is a general-purpose product and is formed by melt spinning of at least one of meltblown and spunbond. The vacuum insulator according to claim 1, wherein the average fiber diameter of the core material is 8 µm to 20 µm, and the density of the core material is 150 to 300 kg / m 3. According to claim 1, wherein the long fiber web of the core material is accommodated in the inner bag, the inner bag is accommodated in the outer bag, the inner bag including the inner bag in the outer bag to reduce the pressure to seal the inside A vacuum insulator, characterized in that. Insulation box body filled with foam insulation while installing vacuum insulation material in the space formed by the outer box and inner box, The vacuum insulator has a core material made of an organic fiber assembly, a getter agent for adsorbing gas or water vapor, an outer material having gas barrier properties for accommodating the core material and the getter agent, and vacuum-sealed the inside of the outer material, The core material of the vacuum insulator is an oriented web of long fibers of polystyrene resin which is amorphous and softens near the glass transition temperature, The core material has a bending elastic modulus of 3000 MPa or more, and an initial thermal conductivity of 2.0 kPa / m · K to 2.8 kPa / m · K and a thermal conductivity of 3.2 kPa / mK to 4.4 after standing for 30 days in a thermostatic chamber at 60 ° C. Insulation box characterized by the above-mentioned. The heat insulating box body according to claim 5, wherein the vacuum insulator is provided on the outer box or the inner box in which the space is formed. The heat insulating box body according to claim 5, wherein the vacuum heat insulating material is provided by bending at a corner portion where two surfaces of the outer box or the inner box cross each other. The heat insulation box of any one of Claims 5-7 is provided, The refrigerator characterized by the above-mentioned. delete

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