JP4886328B2 - Inorganic plate-like body and method for producing the same - Google Patents

Inorganic plate-like body and method for producing the same Download PDF

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JP4886328B2
JP4886328B2 JP2006064984A JP2006064984A JP4886328B2 JP 4886328 B2 JP4886328 B2 JP 4886328B2 JP 2006064984 A JP2006064984 A JP 2006064984A JP 2006064984 A JP2006064984 A JP 2006064984A JP 4886328 B2 JP4886328 B2 JP 4886328B2
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秀雄 相澤
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Nichiha Corp
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    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
    • C04B28/18—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing mixtures of the silica-lime type
    • C04B28/186—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing mixtures of the silica-lime type containing formed Ca-silicates before the final hardening step
    • C04B28/188—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing mixtures of the silica-lime type containing formed Ca-silicates before the final hardening step the Ca-silicates being present in the starting mixture
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00—Technologies for solid waste management
    • Y02W30/50—Reuse, recycling or recovery technologies
    • Y02W30/91—Use of waste materials as fillers for mortars or concrete

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  • Ceramic Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Inorganic Chemistry (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Producing Shaped Articles From Materials (AREA)
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Description

本発明は、水硬性無機質材料と無機質軽量体と木質補強材とを主成分とし、さらにケイ酸カルシウム水和物が添加されていることを特徴とする無機質板状体に関するものである。   The present invention relates to an inorganic plate-like body comprising a hydraulic inorganic material, an inorganic lightweight body, and a wood reinforcing material as main components, and further added with calcium silicate hydrate.

従来からセメントなどの水硬性無機質材料とパルプなどの木質補強材とを主成分とする無機質板がある。
この無機質板は比重が高く耐凍結融解性等はよいが、曲げ強度を高めるために、パルプを大量に添加すると不燃性が損なわれ、また、耐凍結融解性能も劣化する。
また、比重が高い無機質板は板が堅いために、釘打ち性等の施工性に問題がある。
そのため、いろいろな軽量体の添加が検討されている。
たとえば、特許第３３７４５１５号公報には、セメント成形材料にバーミキュライトが添加されており、特公平８−３２６０３号公報にはフライアッシュや球形珪酸カルシウムが添加されている。
特許第３３７４５１５号公報 特公平８−３２６０３号公報 Conventionally, there is an inorganic board mainly composed of a hydraulic inorganic material such as cement and a wood reinforcing material such as pulp.
Although this inorganic board has high specific gravity and good freeze-thaw resistance, etc., in order to increase bending strength, if a large amount of pulp is added, nonflammability is impaired, and freeze-thaw resistance is also deteriorated.
Further, since the inorganic board having a high specific gravity is hard, there is a problem in workability such as nailing.
Therefore, addition of various lightweight bodies has been studied.
For example, in Japanese Patent No. 3374515, vermiculite is added to the cement molding material, and in Japanese Patent Publication No. 8-32603, fly ash and spherical calcium silicate are added.
Japanese Patent No. 3374515 Japanese Patent Publication No. 8-32603

本発明は、さらに軽量で、強度および剛性に優れた無機質板状体およびその製造方法を提供せんとするものである。   The present invention is to provide an inorganic plate-like body that is lighter in weight and excellent in strength and rigidity and a method for producing the same.

上記の課題を解決するための本請求項１に記載の無機質板状体は、水硬性無機質材料と、無機質軽量体と、木質補強材と、ケイ酸カルシウム水和物とからなる無機質板状体において、該水硬性無機質材料を５６．０乃至６５．０質量部、該無機質軽量体を２．４５乃至７．５質量部、該木質補強材を５乃至１５質量部、該ケイ酸カルシウム水和物を３乃至３０質量部含有していることを特徴とする。
An inorganic plate-like body according to claim 1 for solving the above-mentioned problems is an inorganic plate-like body comprising a hydraulic inorganic material, an inorganic lightweight body, a wood reinforcing material, and calcium silicate hydrate. 5 to 65.0 parts by mass of the hydraulic inorganic material , 2.45 to 7.5 parts by mass of the inorganic lightweight body, 5 to 15 parts by mass of the wooden reinforcing material, and calcium silicate hydrate It characterized that you have contained 3 to 30 parts by weight of things.

また、本請求項１に記載の無機質板状体は、前記ケイ酸カルシウム水和物はゾノトライトであり、前記水硬性無機質材料はセメント及びスラグであり、前記木質補強材はダブルディスクリファイナー処理した、径５〜２５μｍ、平均長１．５〜３．０ｍｍの木質パルプであることを特徴とする。
Further, inorganic shaped bodies described in claim 1, wherein the calcium silicate hydrate is Ri xonotlite der, the hydraulic inorganic materials are cement and slag, the wood reinforcement was treated double disc refiner diameter 5 to 25 [mu] m, and wherein the wood pulp der Rukoto of average length 1.5 to 3.0 mm.

また、本請求項２に記載の無機質板状体は、請求項１に記載の無機質板状体において、前記無機質軽量体はパーライトであることを特徴とする。
Further, inorganic shaped bodies described in claim 2, in inorganic shaped body according to claim 1, wherein the inorganic lightweight body and wherein the Ru pearlite der.

また、本請求項３に記載の無機質板状体の製造方法は、水硬性無機質材料を５６．０乃至６５．０質量部と、無機質軽量体を２．４５乃至７．５質量部と、木質補強材を５乃至１５質量部と、ケイ酸カルシウム水和物を３乃至３０質量部とを混合した原料スラリーを調整する工程と、前記工程で得られた原料スラリーを抄造してマット状体にする工程と、前記工程で得られた前記マット状体をプレス成形する工程とを含み、水硬性無機質材料はセメントとスラグであり、木質補強材はダブルディスクリファイナー処理した、径５〜２５μｍ、平均長１．５〜３．０ｍｍの木質パルプであり、ケイ酸カルシウム水和物はゾノトライトであって、セメントを２２．４乃至２６質量部、スラグを３３．６乃至３９質量部混合するとともに、セメントとスラグの質量比を４：６とすることを特徴とする。 Moreover, the manufacturing method of the inorganic plate-shaped body according to claim 3 includes 56.0 to 65.0 parts by mass of a hydraulic inorganic material, 2.45 to 7.5 parts by mass of an inorganic lightweight body, and wood. A step of preparing a raw material slurry in which 5 to 15 parts by mass of a reinforcing material and 3 to 30 parts by mass of calcium silicate hydrate are mixed, and the raw material slurry obtained in the above step is made into a mat-like body And a step of press-molding the mat-like body obtained in the step, the hydraulic inorganic material is cement and slag, and the wood reinforcing material is treated with a double disc refiner, having a diameter of 5 to 25 μm, average a wood pulp length 1.5 to 3.0 mm, calcium silicate hydrate is a xonotlite, 22.4 to 26 parts by weight of cement, as well as mixed 33.6 to 39 parts by weight of the slag cement The mass ratio of the slag 4: characterized by six.

また、本請求項４に記載の無機質板状体の製造方法は、請求項３における無機質板状体の製造方法において、前記無機質軽量体はパーライトであることを特徴とする。
The manufacturing method for the inorganic plate-like body described in claim 4 is the manufacturing method for the inorganic plate-shaped member in claim 3, wherein the inorganic lightweight body and wherein the Ru pearlite der.

本発明によれば、軽量で、強度および剛性に優れた無機質板状体およびその製造方法を提供することができる。   According to the present invention, an inorganic plate-like body that is lightweight and excellent in strength and rigidity and a method for producing the same can be provided.

以下、本発明を実施するための最良の形態を説明する。
本発明の無機質板状体は、水硬性無機質材料と無機質軽量体と木質補強材とを主成分とし、さらにケイ酸カルシウム水和物が混合されている。 Hereinafter, the best mode for carrying out the present invention will be described.
The inorganic plate-like body of the present invention is mainly composed of a hydraulic inorganic material, an inorganic lightweight body, and a wood reinforcing material, and further mixed with calcium silicate hydrate.

水硬性無機質材料としては、セメント、スラグ、石膏等があるが、セメントおよびスラグの少なくとも一方を使用することが好ましい。   Examples of the hydraulic inorganic material include cement, slag, gypsum and the like, and it is preferable to use at least one of cement and slag.

無機質軽量体としては、パーライトや、フライアッシュバルーン、シラスバルーン等があるが、パーライトが好ましい。 Examples of the inorganic lightweight body include pearlite, fly ash balloon, and shirasu balloon, and pearlite is preferable.

木質補強材としては、木質パルプや木繊維、木質繊維束、故紙、マイクロフィブリルセルロース等が挙げられる。
好ましい木質補強材としては、ＤＤＲ（ダブルディスクリファイナー）処理した、径５〜２５μｍ、平均長１．５〜３．０ｍｍの木質パルプがある。 Examples of the wood reinforcing material include wood pulp, wood fiber, wood fiber bundle, waste paper, and microfibril cellulose.
A preferable wood reinforcing material is wood pulp having a diameter of 5 to 25 μm and an average length of 1.5 to 3.0 mm, which has been subjected to a DDR (double disc refiner) treatment.

ここでのケイ酸カルシウム水和物とは、ケイ酸質原料と石灰質原料とを含むスラリーを高温高圧下で反応せしめて、ケイ酸カルシウム反応により生成した水和物であり、ケイ酸質原料とは、ケイ砂、珪石粉、珪藻土、シリカフューム、長石類、粘土鉱物、フライアッシュ等のＳｉＯ２を主成分とするもの、石灰質原料とは、生石灰、消石灰等のＣａＯを主成分とするものである。
これら前記ケイ酸質原料と石灰質原料とを水に分散させてスラリーとし、該スラリーを加圧下に撹拌しながら加熱すると、ケイ酸カルシウム反応によって該スラリー中にトバモライトやゾノトライトなどのケイ酸カルシウム水和物が生成する。
構造上、トバモライト（５ＣａＯ・６ＳｉＯ２・５Ｈ２Ｏ）よりもゾノトライト（６ＣａＯ・６ＳｉＯ２・Ｈ２Ｏ）のほうが耐火性は高いので、ゾノトライトを使用することが好ましい。
ケイ酸カルシウム水和物として好ましいゾノトライトを生成するには、ケイ酸質原料に含まれるＳｉＯ２と石灰質原料に含まれるＣａＯとのモル比をＳｉＯ２：ＣａＯ＝７：３〜３：７の範囲とし、スラリー固形分濃度は通常５〜４０質量％程度とし、反応は、圧力１．０〜２．２ＭＰａ、温度１７０〜２２０℃のオートクレーブ中で撹拌しつつ行い、反応時間は１〜１２時間であることが好ましい。
このあとにシリカ成分を含むスラグを添加することで、ゾノトライトスラリー中の石灰質原料から溶出したカルシウムイオンが、シリカ成分とさらに反応し、
強度向上に寄与する。
また、ケイ酸カルシウム水和物は予め生成したものや、ケイカル板の微粉砕物を用いてもよい。 The calcium silicate hydrate here is a hydrate produced by the reaction of a slurry containing a siliceous raw material and a calcareous raw material at a high temperature and high pressure, and a calcium silicate reaction. Is mainly composed of SiO 2 such as quartz sand, quartzite powder, diatomaceous earth, silica fume, feldspar, clay mineral, fly ash, etc., and the calcareous material is composed mainly of CaO such as quick lime and slaked lime. .
These siliceous raw materials and calcareous raw materials are dispersed in water to form a slurry, and when the slurry is heated with stirring under pressure, calcium silicate hydration such as tobermorite and zonotlite is added to the slurry by a calcium silicate reaction. Things are generated.
The structure, the better the tobermorite (5CaO · 6SiO 2 · 5H 2 O) xonotlite than (6CaO · 6SiO 2 · H 2 O) is refractory high, it is preferable to use a xonotlite.
To generate a preferred xonotlite as calcium silicate hydrate, SiO and the molar ratio between CaO contained in the SiO 2 and calcareous material contained in the siliceous raw material 2: CaO = 7: 3~3: 7 range The slurry solid content concentration is usually about 5 to 40% by mass, and the reaction is performed with stirring in an autoclave at a pressure of 1.0 to 2.2 MPa and a temperature of 170 to 220 ° C., and the reaction time is 1 to 12 hours. Preferably there is.
After this, by adding slag containing a silica component, calcium ions eluted from the calcareous raw material in the zonotlite slurry further react with the silica component,
Contributes to strength improvement.
In addition, calcium silicate hydrate may be generated in advance or a finely pulverized product of a calcium plate.

その他、防水剤として、ワックス、シリコーンオイル、アクリルエマルジョン、コハク酸等を添加してもよい。
防水剤を添加することで、吸水率を格段に低く抑えることができる。
防水剤の混合量は固形分に対して１０質量％以下が好ましい。
また、その他、必要なればマイカ、バーミキュライト等の骨材や、ロックウール、ガラス繊維等の無機繊維補強材やポリプロピレン繊維やビニロン繊維等の有機繊維補強材を添加してもよい。 In addition, wax, silicone oil, acrylic emulsion, succinic acid or the like may be added as a waterproofing agent.
By adding a waterproofing agent, the water absorption rate can be remarkably reduced.
The mixing amount of the waterproofing agent is preferably 10% by mass or less based on the solid content.
In addition, if necessary, aggregates such as mica and vermiculite, inorganic fiber reinforcements such as rock wool and glass fibers, and organic fiber reinforcements such as polypropylene fibers and vinylon fibers may be added.

次ぎに、本発明の無機質板状体の製造方法について説明する。
まず、水硬性無機質材料、無機質軽量体、木質補強材、ケイ酸カルシウム水和物を混合し、さらに水の中に混合して原料スラリーとし、ハチェック方式、フローオン方式等の湿式方式により抄造する。
スラリー濃度は１〜２０質量％程度がよい。
フローオン方式の場合、エンドレスフェルトの上に原料スラリーを流下せしめ、脱水しながら抄造成形された抄造シートをメイキングロールに巻き取り、所定の厚みになったときに切断することで抄造マット状体とする。
その後、抄造マット状体を１〜７ＭＰａの圧力でプレス成形し、さらに、温度
５０〜９０℃、１２〜７２時間養生硬化して、無機質板状体を得た。 Next, a method for producing the inorganic plate-like body of the present invention will be described.
First, mix hydraulic inorganic material, inorganic lightweight body, wood reinforcing material, calcium silicate hydrate, mix in water to make raw material slurry, and make paper by wet method such as Hachek method, flow-on method, etc. To do.
The slurry concentration is preferably about 1 to 20% by mass.
In the case of the flow-on method, the raw material slurry is allowed to flow onto the endless felt, and the paper sheet that has been paper-formed while being dewatered is wound around a making roll and cut when it reaches a predetermined thickness. To do.
Thereafter, the paper-made mat-like body was press-molded at a pressure of 1 to 7 MPa, and further cured by curing at a temperature of 50 to 90 ° C. for 12 to 72 hours to obtain an inorganic plate-like body.

原料の混合比率は、水硬性無機質材料が５５．６乃至８６．０質量部、無機質軽量体が２．４５乃至７．５質量部、木質補強材が５乃至１５質量部と、ケイ酸カルシウム水和物が３乃至３０質量部で混合されることが好ましい。
水硬性無機質材料の質量が５５．６質量部未満だと、期待する強度の値が得られず、８６．０質量部より多いと比重が高くなり施工性に問題が出る可能性がある。
また、無機質軽量体の質量が２．４５質量部未満だと、軽量化に寄与せず、７．５質量部より多いと原料が嵩高になってしまい原料スラリー状態が悪くなり、無機質板状体の比重が高くならず諸物性が低下する。
木質補強材が５質量部未満だと強度や保形性に寄与せず、１５質量部より多いと耐火、防火性能が劣化する可能性がある。
ケイ酸カルシウム水和物が３質量部未満だと、比重が低くならず、軽量化に寄与せず、３０質量部より多いと比重が低くなり過ぎてしまい、プレス圧を高くしないと保形できない。 The mixing ratio of the raw materials is 55.6 to 86.0 parts by mass for the hydraulic inorganic material, 2.45 to 7.5 parts by mass for the inorganic lightweight body, 5 to 15 parts by mass for the wooden reinforcing material, and calcium silicate water. It is preferable that 3 to 30 parts by mass of the Japanese product is mixed.
If the mass of the hydraulic inorganic material is less than 55.6 parts by mass, the expected strength value cannot be obtained.
Further, if the mass of the inorganic lightweight body is less than 2.45 parts by mass, it does not contribute to weight reduction. The specific gravity is not increased and various physical properties are lowered.
If the wood reinforcing material is less than 5 parts by mass, it does not contribute to the strength and shape retention, and if it is more than 15 parts by mass, the fire resistance and fireproof performance may deteriorate.
If the calcium silicate hydrate is less than 3 parts by mass, the specific gravity is not lowered and does not contribute to weight reduction. If it is more than 30 parts by mass, the specific gravity becomes too low, and the shape cannot be retained unless the press pressure is increased. .

このように、水硬性無機質材料と無機質軽量体と木質補強材とを主成分とした無機質板状体に、さらにケイ酸カルシウム水和物が混合することで、軽量で、強度および剛性に優れた無機質板状体を得ることができる。   In this way, calcium silicate hydrate is further mixed with an inorganic plate-like body mainly composed of a hydraulic inorganic material, an inorganic lightweight body, and a wood reinforcing material, so that it is lightweight and has excellent strength and rigidity. An inorganic plate-like body can be obtained.

以下に本発明の実施例を挙げる。
表１に示す原料配合比率、製造条件にて、実施例２、３、比較例１、２、参考例１を製造した。
Examples of the present invention will be given below.
Examples 2 and 3, Comparative Examples 1 and 2 and Reference Example 1 were produced at the raw material blending ratios and production conditions shown in Table 1.

表１によれば、ゾノトライトが１０質量部で、セメント／スラグが７５質量部である参考例１は、比重が１．００で、しかも曲げ強度に優れた無機質板状体が得られた。
ゾノトライトが２０質量部で、セメント／スラグが６５質量部である実施例２は、比重が１．００で、しかも曲げ強度に優れた無機質板状体が得られた。
ゾノトライトが２９質量部で、セメント／スラグが５６質量部である実施例３は、比重が１．００で、しかも曲げ強度に優れた無機質板状体が得られた。
ゾノトライトを添加していない比較例１は、プレス圧力が上がらず、曲げ強度が低かった。
また、ゾノトライトを４０質量部添加した比較例２は、曲げ強度は高くなったが、比重が低くなってしまった。 According to Table 1, Reference Example 1 having 10 parts by mass of zonotlite and 75 parts by mass of cement / slag gave an inorganic plate having a specific gravity of 1.00 and excellent bending strength.
In Example 2 in which zonotlite was 20 parts by mass and cement / slag was 65 parts by mass, an inorganic plate having a specific gravity of 1.00 and excellent bending strength was obtained.
In Example 3 in which zonotrite was 29 parts by mass and cement / slag was 56 parts by mass, an inorganic plate having a specific gravity of 1.00 and excellent bending strength was obtained.
In Comparative Example 1 in which zonotlite was not added, the press pressure did not increase and the bending strength was low.
In Comparative Example 2 in which 40 parts by mass of zonotlite was added, the bending strength was high, but the specific gravity was low.

Claims (4)

水硬性無機質材料と、無機質軽量体と、木質補強材と、ケイ酸カルシウム水和物とからなる無機質板状体において、
該水硬性無機質材料を５６．０乃至６５．０質量部、該無機質軽量体を２．４５乃至７．５質量部、該木質補強材を５乃至１５質量部、該ケイ酸カルシウム水和物を３乃至３０質量部含有しており、
該ケイ酸カルシウム水和物はゾノトライトであり、
該木質補強材はダブルディスクリファイナー処理した、径５〜２５μｍ、平均長１．５〜３．０ｍｍの木質パルプであり、
該水硬性無機質材料はセメントとスラグであって、セメントを２２．４乃至２６質量部、スラグを３３．６乃至３９質量部含有するとともに、セメントとスラグの質量比が４：６である
ことを特徴とする無機質板状体。 In an inorganic plate-like body composed of a hydraulic inorganic material, an inorganic lightweight body, a wood reinforcing material, and calcium silicate hydrate,
56.0 to 65.0 parts by mass of the hydraulic inorganic material, 2.45 to 7.5 parts by mass of the inorganic lightweight body, 5 to 15 parts by mass of the wooden reinforcement, and the calcium silicate hydrate 3 to 30 parts by mass,
The calcium silicate hydrate is zonotlite,
The wood reinforcing material is a wood pulp treated with a double disc refiner, having a diameter of 5 to 25 μm and an average length of 1.5 to 3.0 mm.
The water hydraulic inorganic material is a cement and slag, 22.4 to 26 parts by weight of cement, as well as containing 33.6 to 39 parts by weight of the slag, the mass ratio of the cement and slag 4: 6 der Rukoto An inorganic plate-like body characterized by 前記無機質軽量体はパーライトであることを特徴とする請求項１に記載の無機質板状体。 2. The inorganic plate-like body according to claim 1, wherein the inorganic lightweight body is pearlite. 水硬性無機質材料を５６．０乃至６５．０質量部と、無機質軽量体を２．４５乃至７．５質量部と、木質補強材を５乃至１５質量部と、ケイ酸カルシウム水和物を３乃至３０質量部とを混合した原料スラリーを調整する工程と、
前記工程で得られた原料スラリーを抄造してマット状体にする工程と、
前記工程で得られた前記マット状体をプレス成形する工程とを含む無機質板状体の製造方法であって、
原料スラリーを調整する工程において、水硬性無機質材料はセメントとスラグであり、木質補強材はダブルディスクリファイナー処理した、径５〜２５μｍ、平均長１．５〜３．０ｍｍの木質パルプであり、ケイ酸カルシウム水和物はゾノトライトであって、セメントを２２．４乃至２６質量部、スラグを３３．６乃至３９質量部混合するとともに、セメントとスラグの質量比を４：６とする
ことを特徴とする無機質板状体の製造方法。 56.0 to 65.0 parts by weight of a hydraulic inorganic material, 2.45 to 7.5 parts by weight of an inorganic lightweight body, 5 to 15 parts by weight of a wood reinforcing material, and 3 calcium silicate hydrates Adjusting the raw material slurry mixed with 30 parts by mass;
Making the raw material slurry obtained in the above process into a mat-like body;
A method for producing an inorganic plate-like body comprising a step of press-molding the mat-like body obtained in the step,
In the step of preparing the raw slurry, the hydraulic inorganic material is cement and slag, and the wood reinforcement is a double pulp refiner-treated wood pulp having a diameter of 5 to 25 μm and an average length of 1.5 to 3.0 mm. Calcium acid hydrate is zonotlite, characterized in that 22.4 to 26 parts by mass of cement and 33.6 to 39 parts by mass of slag are mixed, and the mass ratio of cement to slag is 4: 6. A method for producing an inorganic plate. 前記無機質軽量体はパーライトであることを特徴とする請求項３に記載の無機質板状体の製造方法。
The said inorganic lightweight body is a pearlite, The manufacturing method of the inorganic plate-shaped object of Claim 3 characterized by the above-mentioned.
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