JPH08253375A - Calcium silicate slab and its production - Google Patents
Calcium silicate slab and its productionInfo
- Publication number
- JPH08253375A JPH08253375A JP14069995A JP14069995A JPH08253375A JP H08253375 A JPH08253375 A JP H08253375A JP 14069995 A JP14069995 A JP 14069995A JP 14069995 A JP14069995 A JP 14069995A JP H08253375 A JPH08253375 A JP H08253375A
- Authority
- JP
- Japan
- Prior art keywords
- raw material
- weight
- calcium silicate
- curing
- less
- 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.)
- Granted
Links
Classifications
-
- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/60—Production of ceramic materials or ceramic elements, e.g. substitution of clay or shale by alternative raw materials, e.g. ashes
-
- 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
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、珪酸カルシウム板及び
その製造方法に関し、更に詳細には０.７０以下の嵩比
重をもつ珪酸カルシウム板及びその製造方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a calcium silicate board and a method for producing the same, and more particularly to a calcium silicate board having a bulk specific gravity of 0.70 or less and a method for producing the same.
【０００２】[0002]
【従来の技術】従来、珪酸カルシウム板は、軽量で、優
れた加工性及び寸法安定性を持ち、更に不燃性であると
いう特徴を有し、建築材料として主に内装用に広く使用
されている。このような珪酸カルシウム板の成形法とし
て、抄造法、プレスモールド法及び単層成形法等が利用
され、石灰質原料、珪酸質原料、繊維質原料及び無機充
填材を含有してなる原料スラリーから成形された成形体
を、通常は圧力容器内で飽和水蒸気により反応硬化する
ことにより珪酸カルシウム板が製造されている。2. Description of the Related Art Conventionally, calcium silicate board is lightweight, has excellent workability and dimensional stability, and is characterized by being nonflammable, and has been widely used mainly as a building material for interiors. . As a forming method of such a calcium silicate plate, a papermaking method, a press molding method, a single layer forming method or the like is used, and it is formed from a raw material slurry containing a calcareous raw material, a siliceous raw material, a fibrous raw material and an inorganic filler. A calcium silicate plate is manufactured by subjecting the formed body to reaction hardening usually with saturated steam in a pressure vessel.
【０００３】しかし、特に抄造法において、例えば嵩比
重１.０以下の軽量珪酸カルシウム板を製造する場合に
は、水熱反応前の成形体の強度が弱く、また、含有水分
量が多いため、水熱反応中に余剰水の熱膨張が生じた
り、蒸気圧が高くなり、層間剥離やパンクと言った問題
が生ずることがある。However, particularly in the papermaking method, for example, when a lightweight calcium silicate plate having a bulk specific gravity of 1.0 or less is produced, the strength of the molded body before the hydrothermal reaction is weak and the water content is large, Thermal expansion of excess water may occur during the hydrothermal reaction, or the vapor pressure may increase, causing problems such as delamination and puncture.
【０００４】これらの問題を防止するため、成形後にプ
レスを行い、その後に水熱反応を行ったり、水熱反応中
にターンバックルを用いて締め付けるという方法が行わ
れているが、これらの方法を講ずると嵩比重が高くなっ
たり、製造に人手が掛かるといった欠点があった。In order to prevent these problems, a method of pressing after molding and then performing hydrothermal reaction or tightening with a turnbuckle during the hydrothermal reaction is performed. These methods are used. If it is taken, there are drawbacks such as a high bulk specific gravity and labor required for manufacturing.
【０００５】また、特開平６−287083号公報に示されて
いる余剰水の除去方法もあるが、特殊な圧力容器あるい
は蒸気の過熱器を必要とするため一般的な方法とは言え
ない。There is also a method for removing surplus water disclosed in Japanese Patent Laid-Open No. 6-287083, but it cannot be said to be a general method because a special pressure vessel or steam superheater is required.
【０００６】そこで、本発明者らは、石灰質原料１７〜
５０重量％、珪酸質原料１５〜４５重量％、繊維質原料
２〜８重量％及び無機質充填材５〜３０重量％を含有し
てなる原料スラリーを所定の形状に成形後、得られた成
形体を圧力容器内で水熱反応させることからなる軽量珪
酸カルシウム板の製造方法において、珪酸質原料の一部
として比表面積１ｍ2／ｇ以上の非晶質珪酸原料または
珪酸塩原料の１種または２種以上を２〜２０重量％使用
し、且つ成形体を水熱反応させる前に、成形体を(養生
温度−１５)×養生時間＝１２０℃・時間以上となる条
件下で１次養生することを特徴とする軽量珪酸カルシウ
ム板の製造方法を既に提案している(特願平６−323225
号)。この軽量珪酸カルシウム板の製造方法によれば、
水熱反応中の層間剥離やパンクを防止することができ
る。[0006] Therefore, the inventors of the present invention, the calcareous raw material 17 ~
A molded product obtained by molding a raw material slurry containing 50% by weight, 15 to 45% by weight of siliceous raw material, 2 to 8% by weight of fibrous raw material and 5 to 30% by weight of inorganic filler into a predetermined shape. In a method for producing a light weight calcium silicate plate, which comprises hydrothermally reacting in a pressure vessel, one or two of amorphous silicic acid raw material or silicate raw material having a specific surface area of 1 m 2 / g or more as a part of siliceous raw material. Using 2 to 20% by weight of the seeds or more, and before hydrothermally reacting the molded body, the molded body is first cured under the condition of (curing temperature −15) × curing time = 120 ° C. · hour or more. Has already been proposed (Japanese Patent Application No. 6-323225).
issue). According to the manufacturing method of this lightweight calcium silicate plate,
It is possible to prevent delamination and puncture during hydrothermal reaction.
【０００７】[0007]
【発明が解決しようとする課題】しかし、この方法で
は、嵩比重が０.８０±０.５程度のものは作製すること
ができるが、０.７０以下の嵩比重を有する珪酸カルシ
ウム板を製造することはできなかった。However, with this method, a calcium silicate plate having a bulk specific gravity of 0.80 ± 0.5 can be produced, but a calcium silicate plate having a bulk specific gravity of 0.70 or less is produced. I couldn't.
【０００８】また、嵩比重が０.７０以下の珪酸カルシ
ウム板を製造する方法として、珪酸カルシウム板を製造
するための原料スラリーを構成する石灰質原料及び珪酸
質原料の一部を予めゲル化して原料スラリーに添加する
方法も行われている。しかし、このゲルを添加する方法
においても、抄造法により積層した板では層間剥離やパ
ンクと言った問題点がある。Further, as a method for producing a calcium silicate plate having a bulk specific gravity of 0.70 or less, a part of the calcareous raw material and the siliceous raw material constituting the raw material slurry for producing the calcium silicate plate is gelled in advance. The method of adding to a slurry is also performed. However, even in the method of adding this gel, there are problems such as delamination and puncture in the plate laminated by the papermaking method.
【０００９】従って、本発明の目的は、ゲル化用石灰質
原料とゲル化用珪酸質原料とからなるゲルを使用する嵩
比重０.７０以下の珪酸カルシウム板の製造方法におい
て、水熱反応の前に、１次養生を行い、成形体の強度を
向上することにより、上述の欠点を解決し、水熱反応中
に剥離やパンクを生ずることがなく、優れた層間剥離強
度を有する嵩比重０.７０以下の珪酸カルシウム板及び
その製造方法を提供することにある。Accordingly, an object of the present invention is to provide a method for producing a calcium silicate plate having a bulk specific gravity of 0.70 or less using a gel composed of a calcareous raw material for gelation and a siliceous raw material for gelation, before hydrothermal reaction. In addition, by performing primary curing and improving the strength of the molded body, the above-mentioned drawbacks are solved, peeling or puncture does not occur during hydrothermal reaction, and bulk specific gravity of 0. An object of the present invention is to provide a calcium silicate plate of 70 or less and a manufacturing method thereof.
【００１０】[0010]
【課題を解決するための手段】即ち、本発明は、固形分
として石灰質原料５〜３５重量％、珪酸質原料５〜４０
重量％、繊維質原料２〜８重量％、無機質充填材５〜４
０重量％、及びゲル化用石灰質原料２〜２０重量％及び
ゲル化用珪酸質原料３〜２５重量％とから得られたゲル
を含有してなる原料スラリーを抄造法により積層して成
形後、得られた成形体を圧力容器内で水熱反応させるこ
とからなる珪酸カルシウム板の製造方法において、珪酸
質原料の一部として比表面積が１ｍ2／ｇ以上の非晶質
珪酸原料または珪酸塩原料の１種または２種以上を２〜
２０重量％使用し、且つ成形体を水熱反応させる前に、
成形体を(養生温度−１５)×養生時間＝１２０℃・時間
以上となる条件下で１次養生して該成形体の湿潤状態の
曲げ強度を７ｋｇ／ｃｍ2以上且つ１次養生前の曲げ強
度の１.３倍以上とすることを特徴とする嵩比重０.７０
以下の珪酸カルシウム板の製造方法を提供することにあ
る。That is, according to the present invention, 5 to 35% by weight of calcareous raw material and 5 to 40 of siliceous raw material are contained as a solid content.
% By weight, fibrous raw material 2-8% by weight, inorganic filler 5-4
0% by weight, and a raw material slurry containing a gel obtained from a gelling calcareous raw material 2 to 20% by weight and a gelling siliceous raw material 3 to 25% by weight, after being laminated and molded by a papermaking method, In a method for producing a calcium silicate plate, which comprises subjecting the obtained molded body to a hydrothermal reaction in a pressure vessel, an amorphous silicic acid raw material or a silicate raw material having a specific surface area of 1 m 2 / g or more as a part of the siliceous raw material. 1 type or 2 or more types of 2 to
20% by weight and before hydrothermally reacting the shaped body,
The molded body is subjected to primary curing under the condition of (curing temperature −15) × curing time = 120 ° C. · hour or more, and the bending strength of the molded body in a wet state is 7 kg / cm 2 or more and bending before primary curing. Bulk specific gravity of 0.70, which is 1.3 times or more of the strength
It is to provide the following method for producing a calcium silicate plate.
【００１１】また、本発明は、固形分として石灰質原料
５〜３５重量％、珪酸質原料５〜４０重量％、繊維質原
料２〜８重量％、無機質充填材５〜４０重量％、及びゲ
ル化用石灰質原料２〜２０重量％及びゲル化用珪酸質原
料３〜２５重量％とから得られたゲルを含有してなる原
料スラリーを抄造法により積層して成形後、得られた成
形体を圧力容器内で水熱反応させることからなる珪酸カ
ルシウム板の製造方法において、珪酸質原料の一部とし
て比表面積が１ｍ2／ｇ以上の非晶質珪酸原料または珪
酸塩原料の１種または２種以上を２〜２０重量％使用
し、更に、原料スラリーがポルトランドセメント、アル
ミナセメント及び高炉水砕スラグからなる群から選択さ
れる硬化剤を２０重量％以下の量で含有してなり、且つ
成形体を水熱反応させる前に、成形体を(養生温度−１
０)×養生時間＝１２０℃・時間以上となる条件下で１
次養生して該成形体の湿潤状態の曲げ強度を７ｋｇ／ｃ
ｍ2以上且つ１次養生前の曲げ強度の１.３倍以上とする
ことを特徴とする嵩比重０.７０以下の珪酸カルシウム
板の製造方法を提供するにある。In the present invention, the solid content is 5 to 35% by weight of calcareous raw material, 5 to 40% by weight of siliceous raw material, 2 to 8% by weight of fibrous raw material, 5 to 40% by weight of inorganic filler, and gelling. The raw material slurry containing the gel obtained from 2 to 20% by weight of the calcareous raw material for gel and 3 to 25% by weight of the siliceous raw material for gelation is laminated by the paper-making method and molded, and then the obtained molded body is pressed. In a method for producing a calcium silicate plate, which comprises hydrothermally reacting in a container, one or more of amorphous silicic acid raw material or silicate raw material having a specific surface area of 1 m 2 / g or more as a part of siliceous raw material. 2 to 20% by weight, the raw material slurry further contains a curing agent selected from the group consisting of Portland cement, alumina cement and granulated blast furnace slag in an amount of 20% by weight or less, and a molded body is obtained. Hydrothermal reaction Before the molded body (curing temperature -1
0) × curing time = 1 under the condition of 120 ° C / hour or more
Next curing, the bending strength of the molded body in a wet state is 7 kg / c
An object of the present invention is to provide a method for producing a calcium silicate plate having a bulk specific gravity of 0.70 or less, characterized by having a bending strength of m 2 or more and 1.3 times or more of a bending strength before primary curing.
【００１２】更に、本発明は、固形分として石灰質原料
５〜３５重量％、珪酸質原料５〜４０重量％、繊維質原
料２〜８重量％、無機質充填材５〜４０重量％、及びゲ
ル化用石灰質原料２〜２０重量％及びゲル化用珪酸質原
料３〜２５重量％より得られたゲルを含有してなる原料
スラリーを抄造法により積層して成形後、得られた成形
体を圧力容器内で水熱反応させることからなる珪酸カル
シウム板の製造方法において、原料スラリーがポルトラ
ンドセメント、アルミナセメント及び高炉水砕スラグか
らなる群から選択される硬化剤を２０重量％以下の量で
含有し、且つ成形体を水熱反応させる前に、成形体を
(養生温度−１０)×養生時間＝１２０℃・時間以上とな
る条件下で１次養生して該成形体の湿潤状態の曲げ強度
を７ｋｇ／ｃｍ2以上且つ１次養生前の曲げ強度の１.３
倍以上とすることを特徴とする嵩比重０.７０以下の珪
酸カルシウム板の製造方法を提供することにある。Further, according to the present invention, the solid content is 5 to 35% by weight of calcareous raw material, 5 to 40% by weight of siliceous raw material, 2 to 8% by weight of fibrous raw material, 5 to 40% by weight of inorganic filler, and gelling. A raw material slurry containing a gel obtained from 2 to 20% by weight of calcareous raw material for gelling and 3 to 25% by weight of siliceous raw material for gelling is laminated by a paper-making method and molded, and the obtained molded body is a pressure vessel. In the method for producing a calcium silicate plate comprising hydrothermally reacting in a raw material, the raw material slurry contains a hardening agent selected from the group consisting of Portland cement, alumina cement and granulated blast furnace slag in an amount of 20% by weight or less, And before the hydrothermal reaction of the molded body,
(Curing temperature −10) × Curing time = 120 ° C. · 1 hour of primary bending under the condition that the molded article is subjected to primary curing under conditions of 7 kg / cm 2 or more and bending strength before primary curing of 1 .3
It is to provide a method for producing a calcium silicate plate having a bulk specific gravity of 0.70 or less, which is characterized by being more than doubled.
【００１３】また、本発明は、上記方法により製造され
た嵩比重０.７０以下の珪酸カルシウム板であって、層
間剥離強度が曲げ強度の３％以上であることを特徴とす
る嵩比重０.７０以下の珪酸カルシウム板を提供するこ
とにある。Further, the present invention is a calcium silicate plate produced by the above method and having a bulk specific gravity of 0.70 or less, wherein the interlaminar peel strength is 3% or more of the bending strength and the bulk specific gravity is 0.7. It is to provide a calcium silicate plate having a weight of 70 or less.
【００１４】[0014]
【作用】本発明の珪酸カルシウム板の製造方法に使用さ
れる原料スラリーの基本組成は、石灰質原料５〜３５重
量％、珪酸質原料５〜４０重量％、繊維質原料２〜８重
量％、無機質充填材５〜４０重量％、及びゲル化用石灰
質原料２〜２０重量％及びゲル化用珪酸質原料３〜２５
重量％より得られたゲルを含有してなる慣用のものであ
る。また、上記原料スラリーは２０重量％までの硬化剤
を含有するものであってもよい。The basic composition of the raw material slurry used in the method for producing a calcium silicate plate of the present invention is as follows: calcareous raw material 5 to 35% by weight, siliceous raw material 5 to 40% by weight, fibrous raw material 2 to 8% by weight, inorganic material. Filler 5-40% by weight, gelling calcareous raw material 2-20% by weight and gelling siliceous raw material 3-25
It is a conventional one containing a gel obtained by weight%. Further, the raw material slurry may contain up to 20% by weight of a curing agent.
【００１５】ここで、石灰質原料としては、例えば消石
灰、生石灰等を使用することができる。なお、石灰質原
料の配合量が５重量％未満であったり、３５重量％を超
えると曲げ強度が低く、吸水による寸法変化率が大きく
なるために好ましくない。Here, as the calcareous raw material, for example, slaked lime, quick lime or the like can be used. If the blending amount of the calcareous raw material is less than 5% by weight or exceeds 35% by weight, the bending strength is low and the dimensional change rate due to water absorption becomes large, which is not preferable.
【００１６】また、珪酸質原料としては、例えば珪砂、
フライアッシュ等を使用することができる。なお、珪酸
質原料の配合量が５重量％未満であったり、４０重量％
を超えると曲げ強度が低く、吸水による寸法変化率が大
きくなるために好ましくない。As the siliceous raw material, for example, silica sand,
Fly ash or the like can be used. The amount of siliceous raw material is less than 5% by weight or 40% by weight.
If it exceeds, the bending strength is low and the rate of dimensional change due to water absorption increases, which is not preferable.
【００１７】更に、繊維質原料としては、例えばセルロ
ース繊維、ポリプロピレン、ビニロン、ガラスファイバ
ー、カーボンファイバー等を使用することができる。な
お、繊維質原料の配合量が２重量％未満であると、曲げ
強度が低くなるために好ましくなく、また、８重量％を
超えると不燃性でなくなるために好ましくない。なお、
ポリプロピレン、ビニロン、ガラスファイバー、カーボ
ンファイバー等を使用する場合、それらの配合量は５重
量％以下とする必要がある。Further, as the fibrous raw material, for example, cellulose fiber, polypropylene, vinylon, glass fiber, carbon fiber or the like can be used. If the content of the fibrous raw material is less than 2% by weight, the bending strength will be low, and if it exceeds 8% by weight, it will not be nonflammable, which is not preferable. In addition,
When polypropylene, vinylon, glass fiber, carbon fiber, etc. are used, their blending amount must be 5% by weight or less.
【００１８】また、無機質充填材としては、例えばパー
ライト、ウォラストナイト、マイカ、タルク、炭酸カル
シウム、石膏等を使用することができる。なお、無機質
充填材の配合量が５重量％未満であると、吸水による寸
法変化率が大きくなるために好ましくなく、また、４０
重量％を超えると曲げ強度が低下するために好ましくな
い。As the inorganic filler, for example, perlite, wollastonite, mica, talc, calcium carbonate, gypsum and the like can be used. If the blending amount of the inorganic filler is less than 5% by weight, the dimensional change rate due to water absorption increases, which is not preferable.
If it exceeds 5% by weight, the bending strength decreases, which is not preferable.
【００１９】更に、本発明方法においては、上述のよう
な成分配合を有する原料スラリーの珪酸質原料の一部と
して比表面積１ｍ2／ｇ以上の非晶質珪酸原料または珪
酸塩原料を使用することができる。ここで、本明細書に
記載する「比表面積」は、Ｎ2ガス吸着法により測定し
たものを言う。非晶質珪酸原料または珪酸塩原料の比表
面積が１ｍ2／ｇ未満であると、反応性が悪く、水熱反
応前にグリーンシートに充分な強度を付与することがで
きないために好ましくない。Further, in the method of the present invention, an amorphous silicic acid raw material or a silicate raw material having a specific surface area of 1 m 2 / g or more is used as a part of the siliceous raw material of the raw material slurry having the above-mentioned composition. You can Here, the “specific surface area” described in the present specification means that measured by the N 2 gas adsorption method. If the specific surface area of the amorphous silicic acid raw material or the silicate raw material is less than 1 m 2 / g, reactivity is poor and sufficient strength cannot be imparted to the green sheet before the hydrothermal reaction, which is not preferable.
【００２０】また、比表面積１ｍ2／ｇ以上の非晶質珪
酸原料または珪酸塩原料の配合量は２〜２０重量％の範
囲内である。該配合量が２重量％未満では、強度発現性
が悪いために好ましくなく、また、２０重量％を超える
と、濾水性が低下し、生産効率が低下するために好まし
くない。なお、比表面積が１〜１０ｍ2／ｇの範囲内の
原料を使用する場合には、その配合量は１０重量％以上
が好ましく、１０〜１００ｍ2／ｇの範囲内の原料を使
用する場合には、その配合量は５重量％以上が好まし
く、１００ｍ2／ｇ以上の原料を使用する場合には、そ
の配合量は２重量％以上が好ましい。The compounding amount of the amorphous silicic acid raw material or silicate raw material having a specific surface area of 1 m 2 / g or more is in the range of 2 to 20% by weight. When the content is less than 2% by weight, the strength development is poor, which is not preferable, and when it exceeds 20% by weight, drainage is lowered and production efficiency is lowered, which is not preferable. In the case where the specific surface area is to use a raw material in the range of 1 to 10 m 2 / g, the amount is preferably at least 10% by weight, when using raw materials in the range of 10 to 100 m 2 / g Is preferably 5% by weight or more, and when a raw material of 100 m 2 / g or more is used, the compounding amount is preferably 2% by weight or more.
【００２１】比表面積１ｍ2／ｇ以上の非晶質珪酸原料
としては例えば珪藻土、シリコンダスト、フライアッシ
ュ、ホワイトカーボン等を挙げることができる。また、
比表面積１ｍ2／ｇ以上の珪酸塩原料としては例えばゼ
オライト、パイロフィライト、アロフェン、モンモリロ
ナイト鉱物、緑泥石鉱物、アタパルジャイト等が挙げら
れる。なお、これらの原料は２種以上を併用することが
できる。Examples of the amorphous silicic acid raw material having a specific surface area of 1 m 2 / g or more include diatomaceous earth, silicon dust, fly ash and white carbon. Also,
Examples of the silicate raw material having a specific surface area of 1 m 2 / g or more include zeolite, pyrophyllite, allophane, montmorillonite mineral, chlorite mineral, attapulgite, and the like. Two or more of these raw materials can be used in combination.
【００２２】なお、本発明方法においては、原料スラリ
ーに２〜２０重量％のゲル化用石灰質原料と３〜２５重
量％のゲル化用珪酸質原料とを予め例えば７５〜９５℃
の温度で、例えば１.５〜４時間にわたりゲル化するこ
とにより得られるゲルを使用することが必須である。珪
酸カルシウム板を製造するための原料スラリーに、上述
のようなゲルを使用すると、嵩比重０.７０以下の珪酸
カルシウム板を容易に製造することができる。なお、ゲ
ル化用石灰質原料及びゲル化用珪酸質原料は共に特に限
定されるものではなく、慣用のいずれのものを用いても
よい。ゲル化用石灰質原料としては例えば消石灰、生石
灰等を用いることができ、また、ゲル化用珪酸質原料と
しては例えば珪藻土、シリコンダスト、フライアッシ
ュ、ホワイトカーボン等を用いることができる。In the method of the present invention, 2 to 20% by weight of the gelling calcareous raw material and 3 to 25% by weight of the gelling siliceous raw material are previously added to the raw material slurry, for example, at 75 to 95 ° C.
It is essential to use gels obtained by gelling at temperatures of, for example, 1.5 to 4 hours. When the above gel is used in the raw material slurry for producing the calcium silicate plate, the calcium silicate plate having a bulk specific gravity of 0.70 or less can be easily produced. The gelling calcareous raw material and the gelling siliceous raw material are not particularly limited, and any conventional one may be used. As the gelling calcareous raw material, for example, slaked lime, quick lime and the like can be used, and as the gelling siliceous raw material, for example, diatomaceous earth, silicon dust, fly ash, white carbon and the like can be used.
【００２３】更に、本発明方法においては、原料スラリ
ーに硬化剤を配合することもできる。硬化剤は、１次養
生により曲げ強度を向上させるものであり、例えばポル
トランドセメント、アルミナセメント、高炉水砕スラグ
等を使用することができる。硬化剤を配合する場合、そ
の配合量は２０重量％以下、好ましくは３〜２０重量％
の範囲内である。硬化剤の配合量が２０重量％を超える
と珪酸カルシウム板の嵩比重が高くなり、嵩比重０.７
０以下の珪酸カルシウム板を製造することができないた
めに好ましくない。また、３重量％未満では添加効果が
得られないこともある。Further, in the method of the present invention, a curing agent may be added to the raw material slurry. The curing agent improves the bending strength by primary curing, and for example, Portland cement, alumina cement, granulated blast furnace slag, or the like can be used. When the curing agent is compounded, the compounding amount is 20% by weight or less, preferably 3 to 20% by weight.
Within the range of. If the content of the curing agent exceeds 20% by weight, the bulk specific gravity of the calcium silicate plate becomes high, and the bulk specific gravity is 0.7.
It is not preferable because it is impossible to produce a calcium silicate plate of 0 or less. If it is less than 3% by weight, the effect of addition may not be obtained.
【００２４】本発明方法によれば、比表面積１ｍ2／ｇ
以上の非晶質珪酸原料または珪酸塩原料を含有するか、
または含有せず、更に、硬化剤を含有するか、または含
有せず、原料スラリーの一部としてゲルを使用した上述
のような原料スラリーを抄造法により積層して成形す
る。本発明方法において、この抄造法は特に限定される
ものではなく、慣用の任意の方法を採ることができる。According to the method of the present invention, the specific surface area is 1 m 2 / g.
Contains the above amorphous silicic acid raw material or silicate raw material,
Alternatively, the raw material slurry as described above, which does not contain or does not contain the curing agent or does not contain the curing agent and uses gel as a part of the raw material slurry, is laminated and formed by a papermaking method. In the method of the present invention, this papermaking method is not particularly limited, and any conventional method can be adopted.
【００２５】本発明方法の特徴は、上述のようにして得
られた成形体をそのまま水熱反応させるのではなく、１
次養生することにある。ここで、原料スラリーが硬化剤
を含有しない場合には、１次養生は、(養生温度−１５)
×養生時間＝１２０℃・時間以上となるような条件下で
行う。１次養生の条件が１２０℃・時間未満であると、
養生不足で成形体に充分な強度を付与することができな
いために好ましくない。なお、１次養生は、１５℃を超
える養生温度を必要とし、３０〜８０℃の範囲内の養生
温度、２４０℃・時間以上の条件下で１次養生を行うこ
とが好ましい。また、原料スラリーが硬化剤を含有する
ものである場合には、１次養生は、(養生温度−１０)×
養生時間＝１２０℃・時間以上となるような条件下で行
うことができる。これは石灰質原料と珪酸質原料、特
に、非晶質珪酸原料、珪酸塩原料との反応に比べ、硬化
剤の反応は低温でも進行し易いためである。なお、１次
養生は、１５℃を超える養生温度を必要とし、２５〜８
０℃の範囲内の養生温度、２４０℃・時間以上の条件下
で１次養生を行うことが好ましい。The feature of the method of the present invention is that the molded body obtained as described above is not subjected to the hydrothermal reaction as it is,
Next is to be cured. Here, when the raw material slurry does not contain a curing agent, the primary curing is (curing temperature-15).
× Curing time = 120 ° C./hour or more If the condition of primary curing is less than 120 ° C / hour,
It is not preferable because sufficient strength cannot be imparted to the molded body due to insufficient curing. In addition, the primary curing requires a curing temperature higher than 15 ° C., and it is preferable to perform the primary curing under conditions of a curing temperature in the range of 30 to 80 ° C. and 240 ° C./hour or more. When the raw material slurry contains a curing agent, the primary curing is (curing temperature −10) ×
The curing can be performed under the condition that the curing time is 120 ° C./hour or more. This is because the reaction of the curing agent is more likely to proceed at low temperatures than the reaction between the calcareous raw material and the siliceous raw material, particularly the amorphous silicic acid raw material and the silicate raw material. In addition, the primary curing requires a curing temperature exceeding 15 ° C.
Primary curing is preferably carried out under conditions of a curing temperature of 0 ° C. and a temperature of 240 ° C./hour or more.
【００２６】このような１次養生を行うことにより、成
形体の湿潤状態の曲げ強度を７ｋｇ／ｃｍ2以上で、且
つ１次養生前の成形体の曲げ強度の１.３倍以上にまで
上昇させることができる。By carrying out such primary curing, the bending strength of the molded body in a wet state is increased to 7 kg / cm 2 or more and to 1.3 times or more of the bending strength of the molded body before the primary curing. Can be made.
【００２７】上述のような１次養生を行った後の成形体
は、慣用の水熱反応条件下で水熱反応させ、その後の慣
用の工程を経て珪酸カルシウム板とすることができる。
なお、水熱反応は、圧力容器中、飽和水蒸気下で温度１
５０〜２００℃、好ましくは１７０〜１９０℃で、５〜
２０時間、好ましくは８〜１２時間の条件下で行うこと
ができる。The shaped body after the primary curing as described above can be hydrothermally reacted under a conventional hydrothermal reaction condition, and a calcium silicate plate can be obtained through the following conventional steps.
The hydrothermal reaction is carried out in a pressure vessel under saturated steam at a temperature of 1
50 to 200 ° C, preferably 170 to 190 ° C, 5 to
It can be carried out under the condition of 20 hours, preferably 8 to 12 hours.
【００２８】上述のような本発明方法により製造された
嵩比重０.７０以下の珪酸カルシウム板は、層間剥離強
度(絶乾状態)が曲げ強度(絶乾状態)の３％以上と非常に
優れた値を示すものとなる。なお、曲げ強度はＪＩＳ
Ａ５４１８に準じて３号試験片で試験した結果であり、
層間剥離試験は３０×３０ｍｍで行った結果である。The calcium silicate plate produced by the method of the present invention and having a bulk specific gravity of 0.70 or less is very excellent in delamination strength (absolute dry state) of 3% or more of bending strength (absolute dry state). It shows the value of The bending strength is JIS
It is the result of testing with No. 3 test piece according to A5418,
The delamination test is the result of 30 × 30 mm.
【００２９】[0029]
【実施例】以下に実施例及び比較例を挙げて本発明方法
の珪酸カルシウム板の製造方法を更に説明する。 実施例、比較例 表１に示す割合で原料を配合し、１２倍の水で混合、撹
拌した。なお、ゲルは、重量比１：１の消石灰と珪藻土
とを、水比５倍、９０℃、２時間の条件でゲル化したも
のを使用した。なお、表中のゲルの配合量は固形分換算
量として示した。 更に、水を加えて固形分濃度約３重
量％の原料スラリーとし、６ｍｍの厚さに抄造した。次
に、表１に記載する温度、時間で１次養生した後、圧力
容器中、飽和水蒸気下で１８０℃、１０時間の条件で水
熱反応を行った。表１に、抄造直後の成形体の曲げ強
度、１次養生後の成形体の曲げ強度、水熱反応後の嵩比
重、曲げ強度並びに層間剥離強度(共に絶乾状態)を示
す。EXAMPLES The method for producing a calcium silicate plate according to the present invention will be further described below with reference to examples and comparative examples. Examples and Comparative Examples Raw materials were blended in the proportions shown in Table 1, mixed with 12 times water and stirred. The gel used was a gel of slaked lime and diatomaceous earth in a weight ratio of 1: 1 under the conditions of a water ratio of 5 times and 90 ° C. for 2 hours. In addition, the compounding amount of the gel in the table is shown as a solid content conversion amount. Further, water was added to make a raw material slurry having a solid content concentration of about 3% by weight, and papermaking was performed to a thickness of 6 mm. Next, after primary curing at the temperature and time shown in Table 1, hydrothermal reaction was performed in a pressure vessel under saturated steam at 180 ° C. for 10 hours. Table 1 shows the bending strength of the molded body immediately after the papermaking, the bending strength of the molded body after the primary curing, the bulk specific gravity after the hydrothermal reaction, the bending strength, and the interlaminar peel strength (both in an absolutely dry state).
【００３０】[0030]
【表１】 [Table 1]
【００３１】表１中、シリコンダストはＮ2ガス吸着法
による比表面積が２０ｍ2／ｇのものであり、ゼオライ
トは比表面積が６.５ｍ2／ｇのものであり、珪藻土は比
表面積が２.０ｍ2／ｇのものである。In Table 1, silicon dust has a specific surface area of 20 m 2 / g by N 2 gas adsorption method, zeolite has a specific surface area of 6.5 m 2 / g, and diatomaceous earth has a specific surface area of 2 m 2. It is of 0.0 m 2 / g.
【００３２】[0032]
【発明の効果】以上のように、本発明の珪酸カルシウム
板の製造方法によれば、原料スラリーを抄造法により成
形し、１次養生することにより成形体に強度を付与する
ことができ、それによって水熱反応中の成形体の剥離、
パンクを防止できると共に得られる嵩比重０.７０以下
の珪酸カルシウム板の層間剥離強度を向上させることが
できるという効果を奏するものである。As described above, according to the method for producing a calcium silicate plate of the present invention, strength can be imparted to the molded body by molding the raw material slurry by the papermaking method and primary curing. Peeling of the molded body during hydrothermal reaction,
It is possible to prevent puncture and to improve the interlaminar peel strength of the obtained calcium silicate plate having a bulk specific gravity of 0.70 or less.
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.6 識別記号 庁内整理番号 ＦＩ 技術表示箇所 Ｃ０４Ｂ 14:42） 103:60 111:40 (72)発明者 浅見 琢也 茨城県石岡市大字柏原６−１ 株式会社ア スク中央研究所内 (72)発明者 岩永 朋来 茨城県石岡市大字柏原６−１ 株式会社ア スク中央研究所内 (72)発明者 尾塩 泰英 茨城県石岡市大字柏原６−１ 株式会社ア スク中央研究所内 (72)発明者 杉山 徹 茨城県石岡市大字柏原６−１ 株式会社ア スク中央研究所内─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. 6 Identification number Reference number within the agency FI technical display area C04B 14:42) 103: 60 111: 40 (72) Inventor Takuya Asami Oka 6 Iwaki, Ibaraki Prefecture 6 Kashihara -1 Ask Central Research Institute Co., Ltd. (72) Inventor Tomoki Iwanaga 6-1, Kashiwara, Ishioka City, Ibaraki Prefecture 6-1 Ask Central Research Institute Ltd. (72) Yasue Oshio 6-1 Kashiwabara, Ishioka City, Ibaraki Prefecture 6-1 Co., Ltd. Ask Central Research Laboratory (72) Inventor Tohru Sugiyama 6-1 Kashiwara, Ishioka City, Ibaraki Prefecture
Claims (4)
％、珪酸質原料５〜４０重量％、繊維質原料２〜８重量
％、無機質充填材５〜４０重量％、及びゲル化用石灰質
原料２〜２０重量％及びゲル化用珪酸質原料３〜２５重
量％とから得られたゲルを含有してなる原料スラリーを
抄造法により積層して成形後、得られた成形体を圧力容
器内で水熱反応させることからなる珪酸カルシウム板の
製造方法において、珪酸質原料の一部として比表面積が
１ｍ2／ｇ以上の非晶質珪酸原料または珪酸塩原料の１
種または２種以上を２〜２０重量％使用し、且つ成形体
を水熱反応させる前に、成形体を(養生温度−１５)×養
生時間＝１２０℃・時間以上となる条件下で１次養生し
て該成形体の湿潤状態の曲げ強度を７ｋｇ／ｃｍ2以上
且つ１次養生前の曲げ強度の１.３倍以上とすることを
特徴とする嵩比重０.７０以下の珪酸カルシウム板の製
造方法。1. As a solid content, 5 to 35% by weight of calcareous raw material, 5 to 40% by weight of siliceous raw material, 2 to 8% by weight of fibrous raw material, 5 to 40% by weight of inorganic filler, and calcareous raw material 2 for gelation. ~ 20 wt% and a gelling siliceous raw material 3 to 25 wt%, a raw material slurry containing a gel is laminated by a paper-making method and molded, and the resulting molded body is treated with water in a pressure vessel. In a method for producing a calcium silicate plate, which comprises reacting by heat, as a part of a siliceous raw material, one of an amorphous silicic acid raw material or a silicate raw material having a specific surface area of 1 m 2 / g or more is used.
2 to 20% by weight of one kind or two or more kinds, and before hydrothermally reacting the molded body, the molded body is subjected to primary curing under the condition of (curing temperature −15) × curing time = 120 ° C. · hour or more. A calcium silicate plate having a bulk specific gravity of 0.70 or less, which is cured to a bending strength of the molded body in a wet state of 7 kg / cm 2 or more and 1.3 times or more of a bending strength before primary curing. Production method.
％、珪酸質原料５〜４０重量％、繊維質原料２〜８重量
％、無機質充填材５〜４０重量％、及びゲル化用石灰質
原料２〜２０重量％及びゲル化用珪酸質原料３〜２５重
量％とから得られたゲルを含有してなる原料スラリーを
抄造法により積層して成形後、得られた成形体を圧力容
器内で水熱反応させることからなる珪酸カルシウム板の
製造方法において、珪酸質原料の一部として比表面積が
１ｍ2／ｇ以上の非晶質珪酸原料または珪酸塩原料の１
種または２種以上を２〜２０重量％使用し、更に、原料
スラリーがポルトランドセメント、アルミナセメント及
び高炉水砕スラグからなる群から選択される硬化剤を２
０重量％以下の量で含有してなり、且つ成形体を水熱反
応させる前に、成形体を(養生温度−１０)×養生時間＝
１２０℃・時間以上となる条件下で１次養生して該成形
体の湿潤状態の曲げ強度を７ｋｇ／ｃｍ2以上且つ１次
養生前の曲げ強度の１.３倍以上とすることを特徴とす
る嵩比重０.７０以下の珪酸カルシウム板の製造方法。2. The solid content of calcareous raw material 5 to 35% by weight, siliceous raw material 5 to 40% by weight, fibrous raw material 2 to 8% by weight, inorganic filler 5 to 40% by weight, and gelling calcareous raw material 2 ~ 20 wt% and a gelling siliceous raw material 3 to 25 wt%, a raw material slurry containing a gel is laminated by a paper-making method and molded, and the resulting molded body is treated with water in a pressure vessel. In a method for producing a calcium silicate plate, which comprises reacting by heat, as a part of a siliceous raw material, one of an amorphous silicic acid raw material or a silicate raw material having a specific surface area of 1 m 2 / g or more is used.
2 to 20% by weight of one kind or two or more kinds, and the raw material slurry further contains a hardening agent selected from the group consisting of portland cement, alumina cement and granulated blast furnace slag.
It is contained in an amount of 0% by weight or less, and before the hydrothermal reaction of the molded product, the molded product is (curing temperature-10) x curing time =
A primary curing is performed under the condition of 120 ° C./hour or more, and the bending strength of the molded body in a wet state is 7 kg / cm 2 or more and 1.3 times or more of the bending strength before the primary curing. A method for producing a calcium silicate plate having a bulk specific gravity of 0.70 or less.
％、珪酸質原料５〜４０重量％、繊維質原料２〜８重量
％、無機質充填材５〜４０重量％、及びゲル化用石灰質
原料２〜２０重量％及びゲル化用珪酸質原料３〜２５重
量％より得られたゲルを含有してなる原料スラリーを抄
造法により積層して成形後、得られた成形体を圧力容器
内で水熱反応させることからなる珪酸カルシウム板の製
造方法において、原料スラリーがポルトランドセメン
ト、アルミナセメント及び高炉水砕スラグからなる群か
ら選択される硬化剤を２０重量％以下の量で含有し、且
つ成形体を水熱反応させる前に、成形体を(養生温度−
１０)×養生時間＝１２０℃・時間以上となる条件下で
１次養生して該成形体の湿潤状態の曲げ強度を７ｋｇ／
ｃｍ2以上且つ１次養生前の曲げ強度の１.３倍以上とす
ることを特徴とする嵩比重０.７０以下の珪酸カルシウ
ム板の製造方法。3. The solid content of calcareous raw material 5 to 35% by weight, siliceous raw material 5 to 40% by weight, fibrous raw material 2 to 8% by weight, inorganic filler 5 to 40% by weight, and gelling calcareous raw material 2 ~ 20 wt% and gelling siliceous raw material 3 to 25 wt% of a raw material slurry containing a gel is laminated by a papermaking method and molded, and then the obtained molded body is hydrothermally heated in a pressure vessel. In a method for producing a calcium silicate plate comprising reacting, a raw material slurry contains a hardener selected from the group consisting of Portland cement, alumina cement and granulated blast furnace slag in an amount of 20% by weight or less, and Before hydrothermal reaction, the molded body is
10) × curing time = 120 ° C./hour, primary curing is performed under the condition of 7 hours or more in bending strength of the molded body.
A method for producing a calcium silicate plate having a bulk specific gravity of 0.70 or less, characterized in that the bending strength is not less than cm 2 and not less than 1.3 times the bending strength before primary curing.
の方法により製造された嵩比重０.７０以下の珪酸カル
シウム板であって、層間剥離強度が曲げ強度の３％以上
であることを特徴とする嵩比重０.７０以下の珪酸カル
シウム板。4. A calcium silicate plate having a bulk specific gravity of 0.70 or less manufactured by the method according to any one of claims 1 to 3, and having a delamination strength of 3% or more of bending strength. A calcium silicate plate having a bulk specific gravity of 0.70 or less.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14069995A JP3768262B2 (en) | 1995-01-17 | 1995-06-07 | Calcium silicate plate manufacturing method |
| TW85108038A TW399032B (en) | 1995-05-30 | 1996-07-03 | Method of manufacturing calcium silicate board |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7-5013 | 1995-01-17 | ||
| JP501395 | 1995-01-17 | ||
| JP14069995A JP3768262B2 (en) | 1995-01-17 | 1995-06-07 | Calcium silicate plate manufacturing method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH08253375A true JPH08253375A (en) | 1996-10-01 |
| JP3768262B2 JP3768262B2 (en) | 2006-04-19 |
Family
ID=26338890
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP14069995A Expired - Fee Related JP3768262B2 (en) | 1995-01-17 | 1995-06-07 | Calcium silicate plate manufacturing method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3768262B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0803484A1 (en) * | 1996-04-22 | 1997-10-29 | Ask Corporation | Calcium silicate board and method of manufacture therefor |
| JP2015086107A (en) * | 2013-10-31 | 2015-05-07 | 学校法人日本大学 | Method for manufacturing calcium silicate hydrate |
-
1995
- 1995-06-07 JP JP14069995A patent/JP3768262B2/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0803484A1 (en) * | 1996-04-22 | 1997-10-29 | Ask Corporation | Calcium silicate board and method of manufacture therefor |
| US5851354A (en) * | 1996-04-22 | 1998-12-22 | Ask Corporation | Method of manufacturing calcium silicate board |
| US5952087A (en) * | 1996-04-22 | 1999-09-14 | Ask Corporation | Calcium silicate board and method of manufacture therefor |
| JP2015086107A (en) * | 2013-10-31 | 2015-05-07 | 学校法人日本大学 | Method for manufacturing calcium silicate hydrate |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3768262B2 (en) | 2006-04-19 |
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