JP6168733B2 - Insulation - Google Patents
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- JP6168733B2 JP6168733B2 JP2012117425A JP2012117425A JP6168733B2 JP 6168733 B2 JP6168733 B2 JP 6168733B2 JP 2012117425 A JP2012117425 A JP 2012117425A JP 2012117425 A JP2012117425 A JP 2012117425A JP 6168733 B2 JP6168733 B2 JP 6168733B2
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赤外線反射材としてアルミニウム箔を含有し、軽量で断熱性能に優れ且つ層剥離が起こり難い断熱材に関する。 The present invention relates to a heat insulating material that contains an aluminum foil as an infrared reflecting material, is lightweight and excellent in heat insulating performance, and hardly causes delamination.
一般に、燃料電池や電気炉などの機器では、効率的に作動させるために、機器の周囲を覆うように断熱材が配置されている。このような断熱材として、フュームドシリカと無機繊維からなり、必要に応じて輻射吸収散乱材や無機結合材などを含有し、軽量で柔軟性に富むものが知られている。 Generally, in a device such as a fuel cell or an electric furnace, a heat insulating material is disposed so as to cover the periphery of the device in order to operate efficiently. As such a heat insulating material, it is known that it is made of fumed silica and inorganic fibers, contains a radiation absorbing / scattering material, an inorganic binder, and the like as required, and is lightweight and flexible.
フュームドシリカと無機繊維を使用した断熱材の例として特許文献１には、燃料電池の改質器を包囲する改質器用断熱材として、フュームドシリカと無機繊維を含み、無機及び有機のバインダーを含まず、所望に応じて輻射吸収散乱材として炭化ケイ素などの無機粉体を含み、上記無機繊維が熱の伝播方向と直交するように配向された成形体からなる断熱材が記載されている。 As an example of a heat insulating material using fumed silica and inorganic fibers, Patent Document 1 discloses an inorganic and organic binder containing fumed silica and inorganic fibers as a heat insulating material for a reformer surrounding a reformer of a fuel cell. Insulating materials comprising a molded body that contains inorganic powder such as silicon carbide as a radiation absorption / scattering material as desired and is oriented so that the inorganic fibers are orthogonal to the heat propagation direction are described. .
また、熱線反射性能を有するアルミニウム箔を利用した断熱材も知られている。例えば特許文献２には、厚みが０.５〜１５ｍｍ、気孔率が２０〜９８％のセラミック多孔性シートと、厚みが５〜２００μｍのシート状のアルミニウム箔とを、交互に積層した断熱材が記載されている。しかし、アルミ二ウム箔を交互に積層させたこのような積層断熱材は、シート状のアルミニウム箔と特殊なセラミック多孔性シートを層状に積層して構成しているため、アルミニウム箔が存在する反射層が限られており、熱線反射面が限定されている。また、アルミ二ウム箔とセラミック多孔性シートを層状に交互に多層積層させるため作業手間がかかり、多層になるほどアルミ二ウム箔とセラミック多孔性シートの間で層間剥離が懸念される。 A heat insulating material using an aluminum foil having heat ray reflection performance is also known. For example, Patent Document 2 discloses a heat insulating material in which a ceramic porous sheet having a thickness of 0.5 to 15 mm and a porosity of 20 to 98% and a sheet-like aluminum foil having a thickness of 5 to 200 μm are alternately laminated. Have been described. However, such a laminated heat insulating material in which aluminum foils are alternately laminated is formed by laminating sheet-like aluminum foil and a special ceramic porous sheet in layers, so that there is a reflection in which aluminum foil exists. The layers are limited and the heat ray reflective surface is limited. In addition, since the aluminum foil and the ceramic porous sheet are alternately laminated in layers, it takes time and labor, and there is concern about delamination between the aluminum foil and the ceramic porous sheet as the number of layers increases.
本発明は、上記した従来の断熱材の問題点に鑑みてなされたものであり、大量生産が可能な簡便方法で製造することができ、アルミニウム箔を内包することで断熱性能の向上を図ると同時に、積層しても層間剥離を防ぐことができ、優れた軽量性を有する断熱材を提供することを目的とする。 The present invention has been made in view of the problems of the above-described conventional heat insulating materials, and can be manufactured by a simple method capable of mass production, and by improving the heat insulating performance by including an aluminum foil. At the same time, it is an object to provide a heat insulating material that can prevent delamination even when laminated, and has excellent lightness.
上記目的を達成するため、本発明が提供する第１の断熱材は、フュームドシリカ及びセラミックファイバーと共に、アルミニウム箔切断片を含む成形体からなり、珪酸塩化合物粉体を含んでおらず、前記アルミニウム箔切断片は曲折されるか又はシワ付けし若しくは凸凹を設けてあることを特徴とする単層構造の断熱材である。 To achieve the above object, a first heat insulating material provided by the present invention, together with fumed silica, and ceramic fibers, made from a molding material comprising an aluminum foil cut pieces, not he Nde contains the silicate compound powder, the The aluminum foil cut piece is a heat insulating material having a single-layer structure which is bent or wrinkled or provided with unevenness .
また、本発明が提供する第２の断熱材は、第１断熱層と第２断熱層とを有する成形体からなり、第１断熱層がフュームドシリカとセラミックファイバーを含み、第２断熱層がフュームドシリカ及びセラミックファイバーと共にアルミニウム箔切断片を含み、第１断熱層が熱面側に配置されることを特徴とする積層構造の断熱材である。 Further, the second heat insulating material provided by the present invention is formed of a molded body having a first heat insulating layer and a second heat insulating layer, the first heat insulating layer includes fumed silica and ceramic fibers, and the second heat insulating layer includes A heat insulating material having a laminated structure including an aluminum foil cut piece together with fumed silica and ceramic fibers, wherein the first heat insulating layer is disposed on the hot surface side.
上記本発明による第２の断熱材においては、アルミニウム箔切断片は曲折されるか又はシワ付けし若しくは凸凹を設けてあることが好ましい。また、第１の断熱材におけるアルミニウム箔切断片の含有量、及び第２の断熱材の第２断熱層におけるアルミニウム箔切断片の含有量は、それぞれ０.１〜５０質量％の範囲であることが好ましい。 In the second heat insulating material that by the above present invention, it is preferable that the aluminum foil cut pieces is provided with or wrinkles with and or irregularities being bent. Moreover, content of the aluminum foil cut piece in a 1st heat insulating material and content of the aluminum foil cut piece in the 2nd heat insulation layer of a 2nd heat insulating material are the range of 0.1-50 mass%, respectively. Is preferred.
本発明によれば、アルミニウム箔切断片を分散して含有させることにより、シート状のアルミニウム箔を内部に積層した積層断熱材に比べて、簡便な方法で熱線反射面の表面積を増やすことができ、特にアルミニウム箔切断片を曲折又はシワ付けし若しくは凸凹を設けることで熱線が一層乱反射されるため、断熱材の熱伝導率を低下させることができる。また、アルミニウム箔切断片を含有させることで、シート状のアルミニウム箔を内部に積層した積層断熱材に比べてフュームドシリカ同士の接触が増え、強度が向上するため層間剥離が起こり難くなる。 According to the present invention, it is possible to increase the surface area of the heat ray reflective surface by a simple method as compared with the laminated heat insulating material in which the sheet-like aluminum foil is laminated inside by dispersing and containing the aluminum foil cut pieces. In particular, since the heat ray is more diffusely reflected by bending or wrinkling the aluminum foil cut piece or providing unevenness, the thermal conductivity of the heat insulating material can be lowered. Moreover, by containing an aluminum foil cut piece, contact between fumed silicas increases compared to a laminated heat insulating material in which sheet-like aluminum foil is laminated, and delamination hardly occurs because strength is improved.
従って、本発明の断熱材は、軽量で且つ優れた柔軟性を備えると共に、低熱伝導率であることから優れた断熱性能を有している。しかも、強度の向上によって層間剥離や欠損などが起こり難くなるため、施工時の取扱い性が向上し、且つ熱伝導率の低下によって断熱材全体の厚みを低減することができる。 Therefore, the heat insulating material of the present invention is lightweight and has excellent flexibility, and has excellent heat insulating performance because of its low thermal conductivity. Moreover, since delamination and defects are less likely to occur due to the improvement in strength, the handleability during construction is improved, and the overall thickness of the heat insulating material can be reduced due to the decrease in thermal conductivity.
本発明による第１の断熱材１は、一具体例を図１に示すように、フュームドシリカ１０と、セラミックファイバー１１と、アルミニウム箔切断片１２とを含む成形体からなる、単層構造の断熱材である。
As shown in FIG. 1, the first heat insulating material 1 according to the present invention has a single-layer structure made of a molded body including
また、本発明による第２の断熱材２は、一具体例を図２に示すように、第１断熱層２ａと第２断熱層２ｂとを備えた成形体からなる積層構造の断熱材であり、第１断熱層２ａはフュームドシリカ１０とセラミックファイバー１１を含み、第２断熱層２ｂはフュームドシリカ１０とセラミックファイバー１１と共にアルミニウム箔切断片１２を含んでいる。
Moreover, the 2nd heat insulating material 2 by this invention is a heat insulating material of the laminated structure which consists of a molded object provided with the 1st
尚、上記積層構造を有する第２の断熱材２は、使用時には、第１断熱層２ａが熱面側となるように配置される。また、使用時に熱面側から第１断熱層２ａに加えられる熱によって、第２断熱層２ｂ内のアルミニウム箔切断片１２が損傷しないことが望ましい。そのため、第２断熱層２ｂ内のアルミニウム箔切断片１２が使用時に損傷しない温度域となるように、第１断熱層２ａ及び第２断熱層２ｂの厚さを調整することが好ましい。
In addition, the 2nd heat insulating material 2 which has the said laminated structure is arrange | positioned so that the 1st
上記第１及び第２の断熱材において、主成分であるフュームドシリカは平均粒径５０ｎｍ以下のシリカの超微粉末である。また、セラミックファイバーとしては、シリカ−アルミナ繊維、アルミナ繊維、シリカ繊維、ジルコニア繊維、ロックウール、ガラス繊維などを用いることができ、その中でも低熱伝導率で安価なシリカ−アルミナ繊維やシリカ繊維が好ましい。 In the first and second heat insulating materials, fumed silica as a main component is an ultrafine powder of silica having an average particle size of 50 nm or less. As the ceramic fiber, silica-alumina fiber, alumina fiber, silica fiber, zirconia fiber, rock wool, glass fiber, etc. can be used. Among them, low-thermal conductivity and inexpensive silica-alumina fiber or silica fiber is preferable. .
上記第１及び第２の断熱材は、必須の成分であるフュームドシリカ及びセラミックファイバーと共に、必要に応じて、酸化チタン、炭化ケイ素、酸化ジルコニウム、酸化鉄から選ばれた少なくとも１種のセラミック粉末を含有することができる。これらのセラミック粉末は熱線の輻射散乱吸収材として作用するため、断熱性能を更に向上させることができる。尚、上記セラミック粉末の平均粒径は０.０１〜１００μｍの範囲が好ましい。 The first and second heat insulating materials include at least one ceramic powder selected from titanium oxide, silicon carbide, zirconium oxide, and iron oxide as necessary, together with fumed silica and ceramic fibers, which are essential components. Can be contained. Since these ceramic powders act as a radiation scattering absorber for heat rays, the heat insulation performance can be further improved. The average particle size of the ceramic powder is preferably in the range of 0.01 to 100 μm.
本発明の第１の断熱材及び第２の断熱材の第２断熱層は、フュームドシリカ及びセラミックファイバーと共に、アルミニウム箔切断片を含むことが必要である。このアルミニウム箔切断片は、厚さ６〜２０μｍ程度の通常のアルミニウム箔を、シュレッダーや人手などにより、一定の又は種々の形状に切断したものである。アルミニウム箔切断片の形状は、特に限定するものではなく、矩形や円形のほか、ランダムな形状であってもよい。また、アルミニウム箔切断片の大きさとしては、面積が０.１〜１００ｍｍ２程度であることが好ましい。 The 2nd heat insulation layer of the 1st heat insulating material of this invention and the 2nd heat insulating material needs to contain an aluminum foil cut piece with fumed silica and a ceramic fiber. This aluminum foil cut piece is obtained by cutting a normal aluminum foil having a thickness of about 6 to 20 μm into a certain shape or various shapes by a shredder or a hand. The shape of the aluminum foil cut piece is not particularly limited, and may be a rectangular shape, a circular shape, or a random shape. Moreover, as a magnitude | size of an aluminum foil cut piece, it is preferable that an area is about 0.1-100 mm < 2 >.
このようなアルミニウム箔切断片が第１の断熱材全体及び第２の断熱材の第２断熱層内にランダムな方向を向いて多数内包されることにより、入射した熱線がアルミニウム箔切断片ごとに種々の方向に乱反射されるため、断熱材の熱伝導率を一層効率よく低下させることができる。特にアルミニウム箔切断片は、曲折されるか又はシワ付けし若しくは凸凹を設けることによって各アルミニウム箔切断片の乱反射が更に促されるため、熱伝導率をより一層低下させることができる。 A large number of such aluminum foil cut pieces are included in the entire first heat insulating material and the second heat insulating layer of the second heat insulating material in a random direction so that the incident heat rays are included in each aluminum foil cut piece. Since it is irregularly reflected in various directions, the thermal conductivity of the heat insulating material can be reduced more efficiently. In particular, since the aluminum foil cut pieces are bent or wrinkled or provided with irregularities, the irregular reflection of each aluminum foil cut piece is further promoted, so that the thermal conductivity can be further reduced.
第１の断熱材内及び第２の断熱材の第２断熱層内におけるアルミニウム箔切断片の含有量は、共に０.１〜５０質量％の範囲であることが好ましい。このアルミニウム箔切断片の含有量が０.１質量％未満では、入射した熱線の乱反射が不十分であるため、断熱材の熱伝導率を十分に低下させることができない。また、アルミニウム箔切断片の含有量が５０質量％を超えると、成形性が低下してしまうため好ましくない。尚、上記アルミニウム箔切断片の含有量は、アルミニウム箔切断片の合計表面積では、第１の断熱材１ｍ３あたり又は第２の断熱材の第２断熱層１ｍ３あたり、８〜８４００ｍ２の範囲とすることが好ましい。 The contents of the aluminum foil cut pieces in the first heat insulating material and in the second heat insulating layer of the second heat insulating material are preferably in the range of 0.1 to 50% by mass. When the content of the aluminum foil cut piece is less than 0.1% by mass, the irregular reflection of the incident heat ray is insufficient, and thus the thermal conductivity of the heat insulating material cannot be sufficiently lowered. Moreover, since formability will fall when content of an aluminum foil cut piece exceeds 50 mass%, it is unpreferable. The content of the aluminum foil cut pieces, in total surface area of the aluminum foil cut piece, the second insulation layer 1 m 3 per second per insulative material 1 m 3 or the second heat insulating material, the range of 8～8400M 2 It is preferable that
第１及び第２の断熱材において、第１の断熱材の組成（アルミニウム箔切断片を除く）、並びに第２の断熱材の第１断熱層及び第２断熱層の組成（アルミニウム箔切断片を除く）は、セラミックファイバーが１質量％未満では断熱材の強度が低下し、逆に５０質量％を超えると成形性が低下してしまうため、フュームドシリカを５０〜９９質量％及びセラミックファイバーを１〜５０質量％とすることが好ましい。 In the first and second heat insulating materials, the composition of the first heat insulating material (excluding the aluminum foil cut piece) and the composition of the first heat insulating layer and the second heat insulating layer of the second heat insulating material (the aluminum foil cut piece Is less than 1% by mass, the strength of the heat insulating material is reduced. Conversely, if it exceeds 50% by mass, the moldability is reduced. Therefore, 50 to 99% by mass of fumed silica and ceramic fiber It is preferable to set it as 1-50 mass%.
また、セラミック粉末を含有する場合には、第１の断熱材の組成（アルミニウム箔切断片を除く）、並びに第２の断熱材の第１断熱層及び第２断熱層の組成（アルミニウム箔切断片を除く）については、フュームドシリカを５０〜８０質量％、セラミックファイバーを１〜５０質量％、セラミック粉末を１０〜３０質量％とすることが好ましい。 When ceramic powder is contained, the composition of the first heat insulating material (excluding the aluminum foil cut piece) and the composition of the first heat insulating layer and the second heat insulating layer of the second heat insulating material (the aluminum foil cut piece) Is preferably 50 to 80% by mass of fumed silica, 1 to 50% by mass of ceramic fiber, and 10 to 30% by mass of ceramic powder.
次に、本発明による断熱材の製造方法について説明する。まず、フュームドシリカとセラミックファイバーを混合し、必要に応じて更にセラミック粉末を混合して、１次成形原料を調製する。また、この１次成形原料に、更に所定量のアルミニウム箔切断片を混合して、２次成形原料を調整する。尚、上記成形原料の混合調整は、通常のミキサーなどを用いて行うことができる。ただし、上記２次成形原料を調整する際には、ミキサーの回転数を下げるか又は手動で撹拌することにより、アルミニウム箔切断片が例えば団子状などの熱線反射面の表面積が極端に減少する形状とならないようにすることが望ましい。 Next, the manufacturing method of the heat insulating material by this invention is demonstrated. First, fumed silica and ceramic fibers are mixed, and if necessary, ceramic powder is further mixed to prepare a primary molding raw material. Further, a predetermined amount of an aluminum foil cut piece is further mixed with the primary forming raw material to adjust the secondary forming raw material. The mixing adjustment of the molding raw material can be performed using a normal mixer or the like. However, when adjusting the secondary forming raw material, the surface of the heat ray reflective surface, such as a dumpling shape, is extremely reduced by lowering the rotational speed of the mixer or stirring manually. It is desirable not to become.
その後、単層構造の第１の断熱材を製造する場合は、上記２次成形原料のみを型枠内に装入して圧縮成形すればよい。また、積層構造の第２の断熱材を製造する場合には、上記１次成形原料と２次成形原料を順に、例えば２次成形原料を装入した上に１次成形原料を装入して、圧縮成形する。圧縮成形時の圧力は、断熱材が好ましいかさ密度（１５０〜８００ｋｇ／ｍ３程度）になるように調整すればよい。尚、第１及び第２の断熱材の形状は、成形型を変えることによって、板状や円筒形状など種々の形状とすることが可能である。 Then, when manufacturing the 1st heat insulating material of a single layer structure, what is necessary is just to insert only the said secondary shaping | molding raw material in a mold, and to compression-mold. In the case of manufacturing the second heat insulating material having a laminated structure, the primary molding raw material and the secondary molding raw material are sequentially charged with, for example, the secondary molding raw material and the primary molding raw material. , Compression molding. What is necessary is just to adjust the pressure at the time of compression molding so that a heat insulating material may become preferable bulk density (about 150-800 kg / m < 3 >). In addition, the shape of the 1st and 2nd heat insulating material can be made into various shapes, such as plate shape and a cylindrical shape, by changing a shaping | molding die.
また、圧縮成形前の上記１次成形原料と２次成形原料はかさ高いため、圧縮成形時の圧縮率は大きくなる。そのため、各原料中にランダムに分散含有されているアルミニウム箔切断片は、圧縮成形時に一方向からの圧縮圧力によって該圧力の方向に対し直角方向に配向しやすくなる。その結果、得られる第１及び第２の断熱材中におけるアルミニウム箔切断片は、その熱線反射面が断熱材の厚さ方向（圧縮成形時の圧力方向）に対して概ね直角方向となる傾向があるため、使用時に熱面側に熱が加えられる熱線の反射に有効である。 Moreover, since the said primary shaping | molding raw material and secondary shaping | molding raw material before compression molding are bulky, the compression rate at the time of compression molding becomes large. Therefore, the aluminum foil cut pieces randomly dispersed and contained in each raw material are easily oriented in a direction perpendicular to the direction of the pressure by compression pressure from one direction during compression molding. As a result, the aluminum foil cut pieces in the obtained first and second heat insulating materials tend to have a heat ray reflective surface in a direction substantially perpendicular to the thickness direction of the heat insulating material (pressure direction during compression molding). Therefore, it is effective for reflection of heat rays in which heat is applied to the hot surface side during use.
本発明の断熱材は、使用時に熱面側に熱が加えられたとき、その熱によって内包されているアルミニウム箔切断片が損傷しないことが望ましい。そのため、断熱材の製造にあたっては、内包されているアルミニウム箔切断片が損傷しない温度域、例えば５００℃以下となるように、断熱材全体の厚さを調整することが好ましい。特に積層構造を有する第２の断熱材は、第１断熱層及び第２断熱層の厚さを調整することによって、第２断熱層をアルミニウム箔切断片が損傷しない温度域とすることができるため、より高温での使用に適している。 In the heat insulating material of the present invention, when heat is applied to the hot surface side during use, it is desirable that the aluminum foil cut pieces contained therein are not damaged by the heat. Therefore, in the manufacture of the heat insulating material, it is preferable to adjust the thickness of the entire heat insulating material so that the temperature is within a range where the enclosed aluminum foil cut piece is not damaged, for example, 500 ° C. or less. In particular, the second heat-insulating material having the laminated structure can adjust the thickness of the first heat-insulating layer and the second heat-insulating layer to make the second heat-insulating layer a temperature range in which the aluminum foil cut piece is not damaged. Suitable for use at higher temperatures.
このようにして得られる本発明の断熱材は、アルミニウム箔切断片が分散して含有されることで、特にアルミニウム箔切断片を曲折又はシワ付けし若しくは凸凹を設けることで、シート状のアルミニウム箔を積層して含む従来の断熱材に比べて熱線反射面の表面積が増えるため、熱伝導率が低く断熱性能に優れている。また、シート状のアルミニウム箔ではなく、アルミニウム箔切断片を分散して含有するため、主成分であるフュームドシリカ同士の接触が増え、強度が向上して欠損や層間剥離が起こり難くなる。 The heat insulating material of the present invention thus obtained is a sheet-like aluminum foil that contains aluminum foil cut pieces in a dispersed manner, in particular by bending or wrinkling the aluminum foil cut pieces or providing irregularities. Since the surface area of the heat ray reflective surface is increased as compared with the conventional heat insulating material including the laminated layers, the thermal conductivity is low and the heat insulating performance is excellent. Further, since the aluminum foil cut pieces are dispersed and contained instead of the sheet-like aluminum foil, the contact between the fumed silicas as the main components increases, the strength is improved, and defects and delamination are unlikely to occur.
本発明の断熱材は、優れた軽量性を保持するために、かさ密度が１５０〜８００ｋｇ／ｍ３であることが好ましく、２００〜４００ｋｇ／ｍ３であることが更に好ましい。また、６００℃における熱伝導率は、０.１Ｗ／(ｍ・Ｋ)以下であることが好ましく、０.０７５Ｗ／(ｍ・Ｋ)以下が更に好ましい。 The heat insulating material of the present invention preferably has a bulk density of 150 to 800 kg / m 3 and more preferably 200 to 400 kg / m 3 in order to maintain excellent lightness. The thermal conductivity at 600 ° C. is preferably 0.1 W / (m · K) or less, and more preferably 0.075 W / (m · K) or less.
［実施例１］
フュームドシリカ９９ｇと、シリカ−アルミナ繊維４２ｇとをよく混合し、１次成形原料とした。また、この１次成形原料に、縦横３.５ｍｍ×厚さ１１μｍのアルミニウム箔切断片２５ｇを加えてよく混合し、２次成形原料を調整した。上記アルミニウム箔切断片を含む２次成形原料を金型に装入して圧縮成形を行って縦１５０×横１５０×厚さ２５ｍｍの単層構造の断熱材を製造した。
[Example 1]
99 g of fumed silica and 42 g of silica-alumina fiber were mixed well to obtain a primary forming raw material. Further, 25 g of an aluminum foil cut piece having a length and width of 3.5 mm × thickness of 11 μm was added to the primary forming raw material and mixed well to prepare a secondary forming raw material. The secondary forming raw material including the aluminum foil cut piece was charged into a mold and compression-molded to produce a heat insulating material having a single layer structure of length 150 × width 150 × thickness 25 mm.
得られた断熱材は、かさ密度が２９０ｋｇ／ｍ３であった。また、断熱材の熱伝導率を測定したところ、５００℃での熱伝導率は０.０６０Ｗ／(ｍ・Ｋ)であった。尚、上記と同様の方法により、アルミニウム箔切断片を含まない断熱材を製造し、同様に評価したところ、かさ密度は２５０ｋｇ／ｍ３であり、５００℃での熱伝導率は０.０８０Ｗ／(ｍ・Ｋ)であった。 The obtained heat insulating material had a bulk density of 290 kg / m 3 . Further, when the thermal conductivity of the heat insulating material was measured, the thermal conductivity at 500 ° C. was 0.060 W / (m · K). In addition, when the heat insulating material which does not contain an aluminum foil cut piece by the method similar to the above was manufactured and evaluated similarly, the bulk density is 250 kg / m 3 and the thermal conductivity at 500 ° C. is 0.080 W / (m · K).
［実施例２］
フュームドシリカ９９ｇと、シリカ−アルミナ繊維４２ｇとをよく混合し、１次成形原料とした。また、この１次成形原料に、縦横５ｍｍ×厚さ１１μｍのアルミニウム箔切断片１０ｇを加えてよく混合し、２次成形原料を調整した。
[Example 2]
99 g of fumed silica and 42 g of silica-alumina fiber were mixed well to obtain a primary forming raw material. Further, 10 g of an aluminum foil cut piece having a length and width of 5 mm and a thickness of 11 μm was added to this primary forming raw material and mixed well to prepare a secondary forming raw material.
上記アルミニウム箔切断片を含む２次成形原料を金型に装入して圧縮した。次に、この金型内の２次成形原料の上に、アルミニウム箔切断片を含まない以外は２次成形原料と同一組成の１次成形原料を装入し、圧縮成形を行って縦１５０×横１５０×厚さ２５ｍｍの積層構造の断熱材を製造した。尚、第１断熱層の厚みは１５ｍｍ、及びアルミニウム箔切断片を含む第２断熱層の厚みは１０ｍｍとなるように調整した。 The secondary forming raw material including the aluminum foil cut piece was charged into a mold and compressed. Next, a primary molding raw material having the same composition as the secondary molding raw material is charged on the secondary molding raw material in the mold except that the aluminum foil cut pieces are not included, and compression molding is performed to obtain a length of 150 × A heat insulating material having a laminated structure of width 150 × thickness 25 mm was manufactured. The thickness of the first heat insulating layer was adjusted to 15 mm, and the thickness of the second heat insulating layer including the aluminum foil cut pieces was adjusted to 10 mm.
得られた断熱材は、かさ密度が２６０ｋｇ／ｍ３であった。また、断熱材の熱伝導率を測定したところ、６００℃での熱伝導率は０.０７９Ｗ／(ｍ・Ｋ)であった。尚、上記と同様の方法により、第１断熱層及び第２断熱層ともアルミニウム箔切断片を含まない断熱材を製造し、同様に評価したところ、かさ密度は２５０ｋｇ／ｍ３であり、６００℃での熱伝導率は０.１０７Ｗ／(ｍ・Ｋ)であった。 The obtained heat insulating material had a bulk density of 260 kg / m 3 . Further, when the thermal conductivity of the heat insulating material was measured, the thermal conductivity at 600 ° C. was 0.079 W / (m · K). In addition, when the heat insulating material which does not contain an aluminum foil cut piece was manufactured for the 1st heat insulation layer and the 2nd heat insulation layer by the method similar to the above, when evaluated similarly, a bulk density is 250 kg / m < 3 > and 600 degreeC The thermal conductivity was 0.107 W / (m · K).
［実施例３］
フュームドシリカ８４ｇと、酸化チタン粉末４２ｇと、シリカ−アルミナ繊維１４ｇとをよく混合し、１次成形原料とした。また、この１次成形原料に、縦横５ｍｍ×厚さ１１μｍのアルミニウム箔切断片１０ｇを加えてよく混合し、２次成形原料を調整した。
[Example 3]
84 g of fumed silica, 42 g of titanium oxide powder, and 14 g of silica-alumina fiber were mixed well to obtain a primary forming raw material. Further, 10 g of an aluminum foil cut piece having a length and width of 5 mm and a thickness of 11 μm was added to this primary forming raw material and mixed well to prepare a secondary forming raw material.
上記アルミニウム箔切断片を含む２次成形原料を金型に装入して圧縮した後、この金型内の２次成形原料の上に、アルミニウム箔切断片を含まない以外は２次成形原料と同一組成の上記１次成形原料を装入し、圧縮成形を行って縦１５０×横１５０×厚さ２５ｍｍの積層構造の断熱材を製造した。尚、第１断熱層の厚みは１５ｍｍ、及びアルミニウム箔切断片を含む第２断熱層の厚みは１０ｍｍとなるように調整した。 After the secondary forming raw material including the aluminum foil cut piece is charged into a mold and compressed, the secondary forming raw material is formed on the secondary forming raw material in the mold except that the aluminum foil cut piece is not included. The primary molding raw material having the same composition was charged and compression molded to produce a heat insulating material having a laminated structure of 150 × 150 × 25 mm thick. The thickness of the first heat insulating layer was adjusted to 15 mm, and the thickness of the second heat insulating layer including the aluminum foil cut pieces was adjusted to 10 mm.
得られた断熱材は、かさ密度が２６０ｋｇ／ｍ３であった。また、断熱材の熱伝導率を測定したところ、６００℃での熱伝導率は０.０６４Ｗ／(ｍ・Ｋ)であった。尚、上記と同様の方法により、第１断熱層及び第２断熱層ともアルミニウム箔切断片を含まない断熱材を製造し、同様に評価したところ、かさ密度は２５０ｋｇ／ｍ３であり、６００℃での熱伝導率は０.０８２Ｗ／(ｍ・Ｋ)であった。 The obtained heat insulating material had a bulk density of 260 kg / m 3 . Further, when the thermal conductivity of the heat insulating material was measured, the thermal conductivity at 600 ° C. was 0.064 W / (m · K). In addition, when the heat insulating material which does not contain an aluminum foil cut piece was manufactured for the 1st heat insulation layer and the 2nd heat insulation layer by the method similar to the above, when evaluated similarly, a bulk density is 250 kg / m < 3 > and 600 degreeC The thermal conductivity of was 0.082 W / (m · K).
１ 第１の断熱材
２ 第２の断熱材
２ａ 第１断熱層
２ｂ 第２断熱層
１０ フュームドシリカ
１１ セラミックファイバー
１２ アルミニウム箔切断片
DESCRIPTION OF SYMBOLS 1 1st heat insulating material 2 2nd
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