JPH0828776A - Core material for vacuum heat insulation material, manufacture thereof and vacuum heat insulation material - Google Patents
Core material for vacuum heat insulation material, manufacture thereof and vacuum heat insulation materialInfo
- Publication number
- JPH0828776A JPH0828776A JP6188770A JP18877094A JPH0828776A JP H0828776 A JPH0828776 A JP H0828776A JP 6188770 A JP6188770 A JP 6188770A JP 18877094 A JP18877094 A JP 18877094A JP H0828776 A JPH0828776 A JP H0828776A
- Authority
- JP
- Japan
- Prior art keywords
- inorganic
- core material
- vacuum heat
- heat insulating
- heat insulation
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、真空断熱材用芯材とそ
の製造方法並びに前記真空断熱材用芯材を用いた真空断
熱材に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a core material for a vacuum heat insulating material, a method for producing the same, and a vacuum heat insulating material using the core material for a vacuum heat insulating material.
【０００２】[0002]
【従来の技術】平板状の真空断熱材の場合、耐圧強度
上、芯材が必要であり、従来はこの芯材としてパーライ
トやシリカ等の粉末状充填物、或いはグラスウール等の
繊維系充填物を真空に保たれた容器内に封入することが
行われており、この芯材は断熱構造をしている必要があ
る。2. Description of the Related Art In the case of a flat-plate vacuum heat insulating material, a core material is required in view of pressure resistance. Conventionally, a powdery material such as pearlite or silica or a fiber material such as glass wool is used as the core material. Encapsulation is performed in a container kept in a vacuum, and the core material needs to have a heat insulating structure.
【０００３】[0003]
【発明が解決しようとする課題】しかしながら、前記粉
末状充填物の場合、熱伝導方向に独立し、断熱性能が優
れているが、製造に際して粉末の計量、予備成形等の煩
雑な工程が必要であり、また、粉末が飛散する等の作業
環境上の問題がある。さらに、充填時には密度が大き
く、芯材の重量は大変重くなるという不都合がある。ま
た、前記繊維系充填物の場合は、通常、積層状、つま
り、繊維が２次元的な平面構造をとって配向しているた
め、これを芯材として使用した場合、断熱性能は良好で
あるが、真空に引いた時にかかる厚さ方向への荷重に対
して非常に弱く、かかる荷重に耐えることができず、初
期厚さの１／２〜１／３程度にまで圧縮されてしまうと
いう不都合がある。本発明はこのような従来の不都合を
生じない、真空断熱材用芯材とその製造方法並びに前記
真空断熱材用芯材を用いた真空断熱材を提供することを
目的とする。However, in the case of the above-mentioned powdery filler, although it is independent in the heat conduction direction and has excellent heat insulating performance, complicated steps such as powder weighing and preforming are required in the production. There is also a problem in the working environment such as powder scattering. Further, there is a disadvantage that the density is high at the time of filling and the weight of the core material becomes very heavy. In addition, in the case of the above-mentioned fibrous filler, since the fibers are usually laminated, that is, the fibers are oriented in a two-dimensional planar structure, when this is used as a core material, the heat insulation performance is good. However, it is very weak against the load in the thickness direction when it is evacuated, cannot withstand the load, and is compressed to about 1/2 to 1/3 of the initial thickness. There is. An object of the present invention is to provide a core material for a vacuum heat insulating material, a method for manufacturing the same, and a vacuum heat insulating material using the core material for a vacuum heat insulating material, which does not cause such a conventional inconvenience.
【０００４】[0004]
【課題を解決するための手段】本発明の真空断熱材用芯
材は前記目的を達成するべく、無機質短繊維を無機バイ
ンダーで固化させた成形体の前記各無機質短繊維の配向
をランダムな配向としたことを特徴とする。また、本発
明の真空断熱材用芯材の製造方法は、無機質短繊維の綿
を解繊し、これに加湿溶融性無機粉体を混合し、次いで
前記無機粉体を加湿溶融し、その後、加熱加圧成形する
ことを特徴とする。また、本発明の真空断熱材は、前記
真空断熱材用芯材をフィルムで被覆し、内部を高真空と
して封止したことを特徴とする。In order to achieve the above object, the core material for a vacuum heat insulating material of the present invention has a random orientation of the orientation of each of the inorganic short fibers of a molded body obtained by solidifying the inorganic short fibers with an inorganic binder. It is characterized by Further, the method for producing a core material for a vacuum heat insulating material of the present invention is to defibrate cotton of an inorganic short fiber, mix it with a humidifying meltable inorganic powder, and then humidify and melt the inorganic powder, and thereafter, It is characterized in that it is heated and pressed. The vacuum heat insulating material of the present invention is characterized in that the core material for vacuum heat insulating material is covered with a film, and the inside is sealed in a high vacuum.
【０００５】前記無機質短繊維としては、セラミック繊
維、岩綿繊維、ガラス繊維が挙げられるが、平均繊維径
０．５〜８μｍのグラスウール等の無機質短繊維の解繊
物を用いることが好ましい。これは繊維径が０．５μｍ
未満のものは製造コストも高く凡用性がなく、８μｍを
超えると単位体積当たりの繊維の数が少なくなり、繊維
のからみが少なくなるため板状に形状を保持するのが難
しいためである。また、解繊後の繊維長は長すぎては伝
熱方向に直角方向の繊維が連続し易くランダム性がくず
れ、短すぎては強度低下を起こすことから、繊維長は１
０〜３０ｍｍ程度が好ましい。また、解繊マットの単重
は２〜５ｋｇ／ｍ2 最終断熱用芯材の密度は１００〜２
５０ｋｇ／ｍ3 程度とするのが好ましい。これは、密度
が低いと強度不足で作業性も悪くなり、密度が高いと断
熱材の軽量化の観点から芯材に使用する意味がないため
である。Examples of the inorganic short fibers include ceramic fibers, rock wool fibers and glass fibers, but it is preferable to use defibrated inorganic short fibers such as glass wool having an average fiber diameter of 0.5 to 8 μm. This has a fiber diameter of 0.5 μm
If less than 8 μm, the number of fibers per unit volume decreases, and the number of fibers per unit volume decreases, so that it is difficult to maintain a plate-like shape. Further, if the fiber length after defibration is too long, the fibers in the direction perpendicular to the heat transfer direction are likely to be continuous, and the randomness collapses, and if it is too short, the strength decreases.
It is preferably about 0 to 30 mm. The unit weight of the defibrating mat is 2 to 5 kg / m 2 and the density of the final heat insulating core material is 100 to 2
It is preferably about 50 kg / m 3 . This is because when the density is low, the strength is insufficient and workability is deteriorated, and when the density is high, it is meaningless to use the core material from the viewpoint of reducing the weight of the heat insulating material.
【０００６】また、前記無機バインダーとしては、水ガ
ラス、コロイダルシリカ（シリカゲル）、アルミナゾル
等の水溶液を含浸させた後、乾燥硬化したもの等が挙げ
られるが、ケイ酸ナトリウム等の加湿溶融性無機粉体を
高温高湿下で溶解付着させた後、乾燥硬化したものを用
いることが好ましい。Examples of the inorganic binder include those obtained by impregnating water glass, colloidal silica (silica gel), an aqueous solution of alumina sol or the like and then drying and hardening the same. Wet-melting inorganic powder such as sodium silicate. It is preferable to use a body obtained by melting and adhering the body under high temperature and high humidity and then drying and curing.
【０００７】[0007]
【作用】前記真空断熱材用芯材は、繊維方向がランダム
で、厚さ方向に配向した繊維が増えたことにより、耐圧
強度が強くなった。また、バインダーも加湿溶融性の粉
末状のものを混合させることで乾燥硬化時のマイグレー
ション作用により表層部のみバインダーがかたよること
なく成形体に均一に付けることができるようになり、ま
た、乾燥硬化後にバインダーの中の水分が残留しないよ
うに予めバインダーが溶解する水分しか芯材に含ませて
いないことから水分による熱伝導率への影響がなくな
り、密度を高くすることなく耐圧強度を向上させている
と共に、熱伝導率は粉末状充填物を芯材としたものと同
程度である。In the core material for a vacuum heat insulating material, the fiber direction is random and the number of fibers oriented in the thickness direction is increased, so that the compressive strength is increased. Also, by mixing the binder in the form of a moisturizing meltable powder, it becomes possible to uniformly attach the binder only to the surface layer portion due to the migration action at the time of dry curing without warping, and after drying and curing. Since the core material contains only the water in which the binder dissolves in advance so that the water in the binder does not remain, the influence of the water on the thermal conductivity is eliminated, and the compressive strength is improved without increasing the density. At the same time, the thermal conductivity is about the same as that of the powdery filler as the core material.
【０００８】[0008]
【実施例】次に、本発明の実施例につき説明する。ま
ず、平均繊維径７．０μｍのＥガラスのグラスウールを
解繊機により解繊し、解繊したグラスウールを金網の上
に密度むらが生じないように静圧１００ｍｍＨ2 Ｏで吸
引して単重４ｋｇ／ｍ2 の解繊マットを得た。解繊によ
り解繊前の平均繊維長２００ｍｍを平均繊維長１０〜３
０ｍｍ程度に短くした。この解繊時にケイ酸ナトリウム
粉末をグラスウール重量に対して２０％添加した。これ
を５０℃の高湿度の雰囲気（湿度９８％ＲＨ以上）に保
持することにより、ケイ酸ナトリウム粉末を溶解させ
た。これを適当な大きさの型内に入れて加熱成形するこ
とにより、ケイ酸ナトリウムが硬化して密度２００ｋｇ
／ｍ3 の芯材が得られた。EXAMPLES Next, examples of the present invention will be described. First, glass wool of E glass having an average fiber diameter of 7.0 μm is defibrated by a defibrating machine, and the defibrated glass wool is sucked with a static pressure of 100 mmH 2 O so that density unevenness does not occur on the wire mesh, and a single weight of 4 kg / A defibration mat of m 2 was obtained. The average fiber length of 200 mm before defibration by defibration is 10 to 3
It was shortened to about 0 mm. At the time of this defibration, 20% of sodium silicate powder was added to the weight of glass wool. The sodium silicate powder was dissolved by maintaining this in a high-humidity atmosphere of 50 ° C. (humidity of 98% RH or more). By putting this in a mold of an appropriate size and heat-molding, the sodium silicate hardens and the density is 200 kg.
A core material of / m 3 was obtained.
【０００９】こうして得られた芯材をアルミをラミネー
トしたフィルム容器に入れ、内部を０．０１Ｔｏｒｒの
真空状態にして封止した。この真空断熱材を評価したと
ころ、熱伝導率は０．００７Ｗ／ｍ・Ｋであり、従来の
粉末状充填物を芯材としたものと同程度であった。ま
た、常圧と真空状態の厚さの変化率は約５％と少ない値
であった。The core material thus obtained was placed in a film container laminated with aluminum, and the inside was sealed under a vacuum of 0.01 Torr. When this vacuum heat insulating material was evaluated, the thermal conductivity was 0.007 W / m · K, which was about the same as that of the conventional powdery filler used as the core material. The rate of change in thickness between normal pressure and vacuum was a small value of about 5%.
【００１０】[0010]
【発明の効果】以上のように、本発明は、無機質短繊維
をランダムに配向させ、また、バインダーに粉末状の無
機バインダーを用いることにより、熱伝導率は従来通り
のままで、軽く耐圧強度のある芯材を製造することが可
能となる。As described above, according to the present invention, the inorganic short fibers are randomly oriented, and the powdered inorganic binder is used as the binder, so that the thermal conductivity remains the same as before and the pressure resistance is light. It is possible to manufacture a core material with
Claims (7)
せた成形体の前記各無機質短繊維の配向をランダムな配
向としたことを特徴とする真空断熱材用芯材。1. A core material for a vacuum heat insulating material, characterized in that the orientation of each of the inorganic short fibers of a molded body obtained by solidifying the inorganic short fibers with an inorganic binder is a random orientation.
８μｍの無機質短繊維の解繊物であることを特徴とする
請求項１記載の真空断熱材用芯材。2. The inorganic short fibers have an average fiber diameter of 0.5 to
The core material for a vacuum heat insulating material according to claim 1, which is a defibrated material of inorganic short fibers of 8 μm.
等の加湿溶融性無機粉体であることを特徴とする請求項
１または２記載の真空断熱材用芯材。3. The core material for a vacuum heat insulating material according to claim 1, wherein the inorganic binder is a moisturizing and melting inorganic powder such as sodium silicate.
溶融性無機粉体を混合し、次いで前記無機粉体を加湿溶
融し、その後、加熱加圧成形することを特徴とする請求
項１記載の真空断熱材用芯材の製造方法。4. A method of defibrating inorganic short-fiber cotton, mixing it with a humidifying meltable inorganic powder, then humidifying and melting the inorganic powder, and then heat-press molding. Item 2. A method for producing a core material for a vacuum heat insulating material according to Item 1.
８μｍであることを特徴とする請求項４記載の真空断熱
材用芯材の製造方法。5. The inorganic short fibers have an average fiber diameter of 0.5 to
It is 8 micrometers, The manufacturing method of the core material for vacuum heat insulating materials of Claim 4 characterized by the above-mentioned.
ことを特徴とする請求項４または５記載の真空断熱材用
芯材の製造方法。6. The method for producing a core material for a vacuum heat insulating material according to claim 4 or 5, wherein the inorganic powder is sodium silicate.
ルムで被覆し、内部を高真空として封止したことを特徴
とする真空断熱材。7. A vacuum heat insulating material, characterized in that the core material for vacuum heat insulating material according to claim 1 is covered with a film and the inside is sealed in a high vacuum.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6188770A JPH0828776A (en) | 1994-07-19 | 1994-07-19 | Core material for vacuum heat insulation material, manufacture thereof and vacuum heat insulation material |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6188770A JPH0828776A (en) | 1994-07-19 | 1994-07-19 | Core material for vacuum heat insulation material, manufacture thereof and vacuum heat insulation material |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0828776A true JPH0828776A (en) | 1996-02-02 |
Family
ID=16229479
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6188770A Pending JPH0828776A (en) | 1994-07-19 | 1994-07-19 | Core material for vacuum heat insulation material, manufacture thereof and vacuum heat insulation material |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0828776A (en) |
Cited By (16)
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|---|---|---|---|---|
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| WO2003102460A1 (en) | 2002-05-31 | 2003-12-11 | Matsushita Refrigeration Company | Vacuum thermal insulating material, process for producing the same and refrigerator including the same |
| JP2004197953A (en) * | 2004-03-10 | 2004-07-15 | Nihon Glassfiber Industrial Co Ltd | Insulating member for vacuum insulating material |
| JP2007085696A (en) * | 2005-09-26 | 2007-04-05 | Matsushita Electric Ind Co Ltd | Vacuum heat insulating box body |
| EP2105648A1 (en) | 2008-03-25 | 2009-09-30 | Mitsubishi Electric Corporation | Vacuum heat insulating material and heat insulating box using the same |
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-
1994
- 1994-07-19 JP JP6188770A patent/JPH0828776A/en active Pending
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| WO2003102460A1 (en) | 2002-05-31 | 2003-12-11 | Matsushita Refrigeration Company | Vacuum thermal insulating material, process for producing the same and refrigerator including the same |
| CN1308611C (en) * | 2002-05-31 | 2007-04-04 | 松下冷机株式会社 | Vacuum thermal insulating material, process for producing the same and refrigerator including the same |
| US7571582B2 (en) | 2002-05-31 | 2009-08-11 | Panasonic Corporation | Vacuum heat insulator, method of manufacturing the same, and refrigerator using the same |
| JP2004197953A (en) * | 2004-03-10 | 2004-07-15 | Nihon Glassfiber Industrial Co Ltd | Insulating member for vacuum insulating material |
| US7947347B2 (en) | 2004-07-20 | 2011-05-24 | Kurashiki Bosek Kabushiki Kaisha | Vacuum heat insulator |
| JP2007085696A (en) * | 2005-09-26 | 2007-04-05 | Matsushita Electric Ind Co Ltd | Vacuum heat insulating box body |
| EP2105648A1 (en) | 2008-03-25 | 2009-09-30 | Mitsubishi Electric Corporation | Vacuum heat insulating material and heat insulating box using the same |
| WO2010073762A1 (en) | 2008-12-26 | 2010-07-01 | 三菱電機株式会社 | Vacuum insulation material, and heat-insulating box, refrigerator, freezing/air-conditioning apparatus, hot-water supply device, and appliance each employing vacuum insulation material, and process for producing vacuum insulation material |
| EP2500617A1 (en) | 2008-12-26 | 2012-09-19 | Mitsubishi Electric Corporation | Vacuum heat insulating material, heat insulating box using vacuum heat insulating material, refrigerator, refrigerating /air-conditioning apparatus, water heater, equipments, and manufacturing method of vacuum heat insulating material |
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| US8617684B2 (en) | 2009-01-29 | 2013-12-31 | Mitsubishi Electric Corporation | Vacuum thermal insulating material and thermal insulating box including the same |
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| US8920899B2 (en) | 2009-10-16 | 2014-12-30 | Mitsubishi Electric Corporation | Vacuum heat insulating material and refrigerator |
| US9068683B2 (en) | 2009-10-16 | 2015-06-30 | Mitsubishi Electric Corporation | Manufacturing apparatus of core material of vacuum heat insulating material, manufacturing method of vacuum heat insulating material, vacuum heat insulating material, and refrigerator |
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| JP5362024B2 (en) * | 2009-10-19 | 2013-12-11 | 三菱電機株式会社 | Vacuum heat insulating material, heat insulating box, refrigerator, refrigeration / air conditioning device, hot water supply device and equipment, and method for manufacturing vacuum heat insulating material |
| WO2011048824A1 (en) | 2009-10-19 | 2011-04-28 | 三菱電機株式会社 | Vacuum heat insulating material, heat insulating box, refrigerator, freezing/air-conditioning device, hot-water supply device, apparatus, and method for manufacturing vacuum heat insulating material |
| US9103482B2 (en) | 2009-10-19 | 2015-08-11 | Mitsubishi Electric Corporation | Vacuum heat insulating material, heat insulating box, refrigerator, refrigerating/air-conditioning apparatus, water heater, appliance, and manufacturing method of vacuum heat insulating material |
| JP2014025536A (en) * | 2012-07-27 | 2014-02-06 | Hitachi Appliances Inc | Vacuum heat insulation material and refrigerator |
| WO2014030651A1 (en) | 2012-08-23 | 2014-02-27 | 旭硝子株式会社 | Vacuum heat-insulating material and method for manufacturing vacuum heat-insulating material |
| JP2020190340A (en) * | 2019-05-20 | 2020-11-26 | 三立化工株式会社 | Adiabatic wall material for ventilation duct of building and method for producing the same |
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