JP2652726B2 - Manufacturing method of high strength gypsum board - Google Patents
Manufacturing method of high strength gypsum boardInfo
- Publication number
- JP2652726B2 JP2652726B2 JP41511590A JP41511590A JP2652726B2 JP 2652726 B2 JP2652726 B2 JP 2652726B2 JP 41511590 A JP41511590 A JP 41511590A JP 41511590 A JP41511590 A JP 41511590A JP 2652726 B2 JP2652726 B2 JP 2652726B2
- Authority
- JP
- Japan
- Prior art keywords
- gypsum
- anhydrous gypsum
- amount
- strength
- slaked lime
- 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.)
- Expired - Lifetime
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
- C04B28/14—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 calcium sulfate cements
- C04B28/16—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 calcium sulfate cements containing anhydrite, e.g. Keene's cement
-
- 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
- C04B2103/00—Function or property of ingredients for mortars, concrete or artificial stone
- C04B2103/10—Accelerators; Activators
- C04B2103/14—Hardening accelerators
-
- 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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00034—Physico-chemical characteristics of the mixtures
- C04B2111/00129—Extrudable mixtures
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は、高強度石膏板の製造方
法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a high strength gypsum board.
【０００２】[0002]
【従来の技術】石膏を主原料として押出成形板を製造す
る技術は、特公昭51−27693 号、特公昭52−29330 号、
特開昭55−9861号などに開示されている。これらの技術
は、概ね各種石膏に増粘剤、硬化促進剤、水などを配合
して押出成形するというものである。2. Description of the Related Art The technology of manufacturing an extruded plate using gypsum as a main raw material is disclosed in Japanese Patent Publication No. 51-27693, Japanese Patent Publication No. 52-29330,
It is disclosed in JP-A-55-9861 and the like. These techniques generally involve extruding a mixture of various gypsums with a thickener, a curing accelerator, water and the like.
【０００３】また、II型無水石膏を早期に固めるための
硬化促進剤に関しても、同様に特許文献に開示されてお
り、例えば、特公昭49−1768号にはカリミョウバンとカ
性アルカリの併用、特公昭52−48625 号にはカリミョウ
バンおよび硫酸カリウムの１種とアルミン酸ナトリウム
およびアルミン酸カリウムの１種の併用、特公昭53−41
695 号にはカリミョウバン、水溶性アルカリおよびメラ
ミンホルマリン縮合スルホン化物の併用、特公昭58−58
302 号には硫酸カリウム、アルミン酸ナトリウムおよび
塩化カルシウムの併用などが記載されている。[0003] Further, a curing accelerator for early setting of type II anhydrous gypsum is also disclosed in the patent literature. For example, Japanese Patent Publication No. 49-1768 discloses a combination of potassium alum and caustic alkali. Japanese Patent Publication No. 52-48625 discloses a combination of one kind of potassium alum and potassium sulfate and one kind of sodium aluminate and potassium aluminate.
No. 695 is used in combination with alum, water-soluble alkali and melamine formalin condensed sulfonate.
No. 302 describes a combination of potassium sulfate, sodium aluminate and calcium chloride.
【０００４】[0004]
【発明が解決しようとする課題】上記のような石膏を主
原料とした厚型の押出成形板を、中〜高層ビルの住宅の
戸境壁、事務所の間仕切壁などの内装用隔壁材として使
用することが考えられる。しかし、このような場合押出
成形板には、高強度、美観性、遮音性、断熱性、耐火
性、施工性などの特性が要求されることになる。A thick extruded plate made of gypsum as a main raw material as described above is used as a partition wall material for interiors such as door walls of offices of medium to high-rise buildings and partition walls of offices. Can be used. However, in such a case, the extruded plate is required to have characteristics such as high strength, aesthetics, sound insulation, heat insulation, fire resistance, and workability.
【０００５】また、II型無水石膏（以下、無水石膏と略
す）は、通常硬化が遅く、特に消石灰の存在下では、そ
の傾向が一層強くなり、短期間内に製品に必要な強度を
付与することができず、押出成形製品やその他の工場生
産による有形製品の製造には適していない。[0005] Further, type II anhydrous gypsum (hereinafter referred to as anhydrous gypsum) usually hardens slowly, especially in the presence of slaked lime, and imparts necessary strength to the product within a short period of time. It is not suitable for the manufacture of extruded products and other tangible products from factory production.
【０００６】さらに、押出成形製品を製造する場合は、
増粘剤を加える必要があるが、増粘剤は硬化促進剤の塩
類等によって、その機能の低下を来すため、その添加量
を多くする必要が生じる。Further, when manufacturing an extruded product,
Although it is necessary to add a thickener, the function of the thickener is reduced due to salts of the curing accelerator and the like, and therefore, the amount of the thickener must be increased.
【０００７】そこで本発明の目的は、無水石膏を利用し
て押出成形製品を連続的に製造するにあたって、無水石
膏の硬化速度を早めることにより初期強度を高めて、生
産性を向上させることにあり、特に、消石灰の存在下で
も高い初期強度を発現させることにある。Accordingly, an object of the present invention is to improve the productivity by continuously increasing the curing speed of anhydrite to increase the initial strength in the continuous production of an extruded product using anhydrite. In particular, it is to develop a high initial strength even in the presence of slaked lime.
【０００８】本発明の別の目的は、増粘剤の添加量をで
きるだけ少量にするために、増粘剤に対して妨害作用が
少なく、少量の添加で硬化促進効果のある硬化促進剤を
選定することにある。Another object of the present invention is to select a hardening accelerator which has a small interfering effect on the thickener and has a hardening accelerator effect by adding a small amount thereof in order to minimize the amount of the thickener added. Is to do.
【０００９】さらに本発明の別の目的は、高曲げ強度、
遮音性、耐火性および加工性に優れ、厚型の内装用隔壁
材として好ましく利用することができる押出成形製品を
提供することにある。Another object of the present invention is to provide a high bending strength,
It is an object of the present invention to provide an extruded product which is excellent in sound insulation, fire resistance and workability and can be preferably used as a thick interior partition wall material.
【００１０】[0010]
【課題を解決するための手段】本発明は、無水石膏、消
石灰、繊維および充填材を原料とし、これに増粘剤を添
加し、さらに上記無水石膏の硬化促進剤として、硫酸カ
リウム、硫酸アルミニウムおよび１種類以上のナトリウ
ム塩類を添加し、押出成形することを特徴とする高強度
石膏板の製造方法を提供するものである。According to the present invention, an anhydrous gypsum, slaked lime, fiber and filler are used as raw materials, a thickener is added thereto, and potassium sulfate, aluminum sulfate and aluminum sulfate are used as a curing accelerator for the anhydrous gypsum. And a method for producing a high-strength gypsum board, characterized by adding one or more kinds of sodium salts and extruding.
【００１１】上記無水石膏としては、天然石膏、フッ酸
製造時の副産物である無水石膏あるいはリン酸等の化学
石膏製造時の二水石膏の焼成品を用いることができる。As the anhydrous gypsum, natural gypsum, calcined products of anhydrous gypsum which is a by-product in the production of hydrofluoric acid, or dihydrate gypsum in the production of chemical gypsum such as phosphoric acid can be used.
【００１２】化学品を製造する際の副産物である無水石
膏は、その製造時に少量の遊離酸が残留し、pHが酸性状
態であり、そのままでは利用することができない。した
がって本発明においては、このような無水石膏粉末に消
石灰の粉末を添加して中和する。Anhydroplaster, which is a by-product of the production of chemicals, has a small amount of free acid remaining during its production, has an acidic pH, and cannot be used as it is. Therefore, in the present invention, slaked lime powder is added to such an anhydrous gypsum powder for neutralization.
【００１３】このとき用いる消石灰の添加量は、酸性度
合によって異なるが、通常 0.1〜3.0 重量％程度であ
る。製造時のバラツキを考慮して、過剰ぎみに中和さ
せ、pH８〜12.7程度にする。消石灰は硬化に対して悪影
響があるため、その添加量をできるだけ少なくすること
が好ましい。The amount of slaked lime used at this time varies depending on the degree of acidity, but is usually about 0.1 to 3.0% by weight. In consideration of the dispersion at the time of production, the pH is neutralized to an excessive level to about pH 8 to 12.7. Since slaked lime has an adverse effect on hardening, it is preferable to minimize the amount of slaked lime.
【００１４】上記無水石膏（消石灰を含む) の配合量
は、通常、原料の全量に対して30〜80重量％である。無
水石膏の配合量は、製品設計によって決められるが、30
重量％以下では十分な初期強度および製品強度が得られ
ない。また、80重量％を越えて配合した場合は、強度の
増進効果が頭打ちとなるばかりか、硬度が高くなり過ぎ
て加工性が低下する。The amount of the anhydrous gypsum (including slaked lime) is usually 30 to 80% by weight based on the total amount of the raw materials. The amount of anhydrous gypsum is determined by the product design.
If it is less than 10% by weight, sufficient initial strength and product strength cannot be obtained. On the other hand, when the content exceeds 80% by weight, not only does the effect of increasing the strength level out, but also the hardness becomes too high and the workability decreases.
【００１５】本発明の原料には、上記無水石膏および消
石灰のほかに、繊維と充填材が配合される。The raw material of the present invention contains a fiber and a filler in addition to the above anhydrous gypsum and slaked lime.
【００１６】上記繊維としては、汎用のパルプ、ガラス
繊維、炭素繊維等の無機繊維、ビニロン、ナイロン、ポ
リプロピレン等の合成繊維などを用いることができる。
その配合量は原料に対して２〜10重量％程度である。As the fibers, general-purpose pulp, inorganic fibers such as glass fibers and carbon fibers, and synthetic fibers such as vinylon, nylon and polypropylene can be used.
The compounding amount is about 2 to 10% by weight based on the raw material.
【００１７】上記充填材としては、汎用の珪石、石灰
石、二水石膏、タルク、スラグ、フライアッシュ、珪藻
土、ゼオライト、ワラストナイト、マイカ、粘土などを
用いることができる。その配合量は、原料全体から無水
石膏（消石灰を含む）と繊維を除いた量である。As the filler, general-purpose silica stone, limestone, gypsum, talc, slag, fly ash, diatomaceous earth, zeolite, wollastonite, mica, clay and the like can be used. The compounding amount is an amount excluding anhydrous gypsum (including slaked lime) and fibers from the entire raw material.
【００１８】本発明においては、増粘剤が添加される。
増粘剤としては、汎用のメチルセルロース、ヒドロキシ
エチルセルロース、アクリルアマイド重合体その他が用
いられる。その添加量は原料 100重量％に対して外割で
0.2〜2.0 重量％程度である。In the present invention, a thickener is added.
As the thickener, general-purpose methylcellulose, hydroxyethylcellulose, acrylamide polymer and the like are used. The amount added is 100% by weight of the raw material.
It is about 0.2 to 2.0% by weight.
【００１９】本発明においては、さらに硬化促進剤が添
加される。硬化促進剤としては、硫酸カリウム、硫酸ア
ルミニウムおよび１種類以上のナトリウム塩類が用いら
れ、好ましくは無水石膏に対して外割で、合計1.0 〜4.
0 重量％添加される。In the present invention, a curing accelerator is further added. As the hardening accelerator, potassium sulfate, aluminum sulfate and one or more kinds of sodium salts are used, and preferably a total of 1.0 to 4.
0% by weight is added.
【００２０】上記硫酸カリウム量は 0.5〜2.0 重量％、
硫酸アルミニウム量は 0.5〜2.0 重量％、ナトリウム塩
類は 0.1〜1.0 重量％である。なお、無水石膏の配合量
が30〜80重量％であるから、硬化促進剤の配合量は、原
料の含量に対しては、外割で0.3 〜3.2 重量％である。The amount of potassium sulfate is 0.5 to 2.0% by weight,
The amount of aluminum sulfate is 0.5 to 2.0% by weight, and that of sodium salts is 0.1 to 1.0% by weight. Since the amount of anhydrous gypsum is 30 to 80% by weight, the amount of the curing accelerator is 0.3 to 3.2% by weight based on the content of the raw material.
【００２１】各々の硬化促進剤としては、一般の工業用
のものが用いられる。硫酸カリウムの純度は、好ましく
は90〜100 ％程度であり、硫酸アルミニウムは、好まし
くはアルミナ分が10〜30％程度のものである。ナトリウ
ム塩類としては、塩化ナトリウム、硫酸ナトリウム、亜
硫酸ナトリウム、チオ硫酸ナトリウム、炭酸ナトリウ
ム、炭酸水素ナトリウム、ケイ酸ナトリウム、硝酸ナト
リウム、亜硝酸ナトリウム、アルミン酸ナトリウムなど
が好ましく、１種以上が添加される。As each curing accelerator, general industrial accelerators are used. The purity of potassium sulfate is preferably about 90 to 100%, and the aluminum sulfate preferably has an alumina content of about 10 to 30%. As the sodium salts, sodium chloride, sodium sulfate, sodium sulfite, sodium thiosulfate, sodium carbonate, sodium hydrogencarbonate, sodium silicate, sodium nitrate, sodium nitrite, sodium aluminate and the like are preferable, and one or more are added. .
【００２２】本発明の製造方法においては、３種類ある
いはそれ以上の硬化促進剤を添加することによって、消
石灰の存在下で、しかもpHが 8.0〜12.7程度の範囲で変
動しても、曲げ強度の発現効果が高く、特に、５時間か
ら１日間の初期強度の発現に大きく寄与し、また、バラ
ツキの少ない安定な性状の石膏板が得られる。In the production method of the present invention, by adding three or more hardening accelerators, the flexural strength can be reduced even in the presence of slaked lime and even when the pH fluctuates in the range of about 8.0 to 12.7. The effect of the expression is high, and particularly contributes greatly to the expression of the initial strength for 5 hours to 1 day, and a gypsum board of stable properties with little variation can be obtained.
【００２３】上記硬化促進剤の添加量が 1.0％以下で
は、ハンドリングに必要な初期強度および製品としての
必要強度が得られず、また、 4.0％を越えると、強度増
進の効果がなく、却って強度が低下する傾向があり、さ
らに増粘剤の機能を著しく低下させ、押出成形自体を不
可能にする。If the amount of the curing accelerator is 1.0% or less, the initial strength required for handling and the strength required for the product cannot be obtained, and if it exceeds 4.0%, there is no effect of increasing the strength. , And further significantly reduces the function of the thickener, making extrusion itself impossible.
【００２４】本発明の製造方法における押出成形の条件
は、その配合組成、成形体の大きさ、形状、押出成形機
の機種などによって異なる。しかし、通常は、温度が20
〜50℃程度であり、真空圧が 500〜760 mm／Hgであり、
圧力が５〜80kg／cm2 である。また、押出成形物の粘度
は、 0.1〜50×105poiseである。押出成形物の粘度が
0.1×105poise以下では、成形後の形状維持が困難とな
り、また要求される初期強度が得られなくなる。50×10
5poise以上では、成形が不可能となる。The conditions for extrusion molding in the production method of the present invention differ depending on the composition of the composition, the size and shape of the molded product, the model of the extruder, and the like. However, usually the temperature is 20
~ 50 ℃, vacuum pressure is 500 ~ 760mm / Hg,
Pressure is 5~80kg / cm 2. The viscosity of the extruded product is 0.1 to 50 × 10 5 poise. The viscosity of the extruded product is
Below 0.1 × 10 5 poise, it is difficult to maintain the shape after molding, and the required initial strength cannot be obtained. 50 × 10
Above 5 poise, molding becomes impossible.
【００２５】[0025]
【作用】本発明は、無水石膏、消石灰、繊維および充填
材を原料とし、これに増粘剤を添加し、さらに硬化促進
剤を添加して押出成形製品を製造する製造方法におい
て、上記硬化促進剤として、硫酸カリウム、硫酸アルミ
ニウムおよび１種類以上のナトリウム塩類を用いるるこ
とを特徴としている。According to the present invention, there is provided a method for producing an extruded product by using an anhydrous gypsum, slaked lime, fiber and a filler as raw materials, adding a thickener to the raw material, and further adding a curing accelerator. It is characterized in that potassium sulfate, aluminum sulfate and one or more kinds of sodium salts are used as agents.
【００２６】無水石膏は、通常硬化が遅いが、本発明方
法によれば、硬化促進剤として、硫酸カリウム、硫酸ア
ルミニウムおよび１種類以上のナトリウム塩類を添加す
ることにより、この欠点を改善することができる。特
に、消石灰の存在下でも、初期強度および製品強度が向
上する。Although anhydrous gypsum usually cures slowly, according to the method of the present invention, it is possible to remedy this drawback by adding potassium sulfate, aluminum sulfate and one or more sodium salts as a curing accelerator. it can. Particularly, even in the presence of slaked lime, the initial strength and the product strength are improved.
【００２７】また、上記のように３種類以上の硬化促進
剤を組合せることによって、その添加量を少なくするこ
とができ、これにより押出成形製品の製造に必要な増粘
剤の機能の低下を抑制し、増粘剤の配合量の低減を図る
ことができる。Also, by combining three or more types of curing accelerators as described above, the amount of addition thereof can be reduced, thereby reducing the function of the thickener required for the production of extruded products. It is possible to reduce the amount of the thickener to be suppressed.
【００２８】これらのことで、無水石膏を利用した押出
成形製品を長時間、連続的に生産することが可能とな
り、得られる石膏板は、高比重、高曲げ強度、遮音性、
耐火性、加工性に優れ、例えば、長さ２〜６ｍ程度の大
スパンの内装の間仕切壁等の内装用隔壁材用途に利用す
ることができるようになる。[0028] Thus, it is possible to continuously produce an extruded product using anhydrous gypsum for a long time, and the resulting gypsum board has high specific gravity, high bending strength, sound insulation,
It is excellent in fire resistance and workability, and can be used for partition wall materials for interiors such as partition walls of large span interiors having a length of about 2 to 6 m, for example.
【００２９】[0029]
【実施例】以下に、実施例により本発明をさらに詳しく
説明するが、本発明はこれらに限定されるものではな
い。なお、以下の実施例および比較例において、「％」
は「重量％」の意味である。EXAMPLES The present invention will be described in more detail with reference to the following Examples, but it should not be construed that the present invention is limited thereto. In the following Examples and Comparative Examples, “%”
Means "% by weight".
【００３０】実施例１〜26，比較例１〜26：無水石膏に
あらかじめ所定量の消石灰を添加した混合物およびその
他の原料および添加剤を配合し、アイリッヒ型ミキサー
で１分間、高速回転で乾式混合し、ニーダーで成形に必
要な水を加えて10分間混練して均一に分散させた。Examples 1-26, Comparative Examples 1-26: A mixture of anhydrous gypsum to which a predetermined amount of slaked lime was added in advance and other raw materials and additives were blended, and dry-mixed at high speed with an Erich-type mixer for 1 minute. Then, water necessary for molding was added by a kneader, and the mixture was kneaded for 10 minutes to be uniformly dispersed.
【００３１】ついで混練物をスクリュー型真空押出成形
機で厚さ10mm、幅 200mmに成形し、得られた成形板を15
℃程度の常温で各材令まで水和硬化させた。１〜７日間
の硬化後の成形板は、60℃で乾燥を行い、基準寸法に切
断してその性状を試験により調べた。Next, the kneaded material was formed into a thickness of 10 mm and a width of 200 mm using a screw-type vacuum extrusion molding machine.
It was hydrated and hardened at room temperature of about ° C until each age. The molded plate after curing for 1 to 7 days was dried at 60 ° C., cut into standard dimensions, and the properties were examined by a test.
【００３２】実施例１〜３および比較例１〜３の無水石
膏は、消石灰を 0.2％添加混合し、その時のpHを8.7 に
した粉末である。実施例４〜６および比較例４〜６の無
水石膏は、消石灰を 0.3％添加し、pHを10.1にした粉末
である。実施例７〜９および比較例７〜９の無水石膏
は、消石灰を 0.7％添加し、pHを11.4にした粉末であ
る。実施例10〜26および比較例10〜26の無水石膏は、消
石灰を 2.0％添加し、pHを12.3にした粉末である。The anhydrous gypsum of Examples 1 to 3 and Comparative Examples 1 to 3 are powders in which 0.2% of slaked lime is added and mixed, and the pH at that time is adjusted to 8.7. The anhydrous gypsum of Examples 4 to 6 and Comparative Examples 4 to 6 is a powder to which 0.3% of slaked lime was added to adjust the pH to 10.1. The anhydrous gypsum of Examples 7 to 9 and Comparative Examples 7 to 9 was a powder in which 0.7% of slaked lime was added to adjust the pH to 11.4. The anhydrous gypsum of Examples 10 to 26 and Comparative Examples 10 to 26 is a powder in which 2.0% of slaked lime was added to adjust the pH to 12.3.
【００３３】実施例１〜24および比較例１〜24の成形条
件は、温度が35〜40℃であり、真空圧が 600〜750 mm／
Hgであり、圧力が10〜20kg／cm2 である。また、押出成
形物の粘度は、 0.5〜20×105poise（ピストン法で測
定）である。実施例25，26、比較例25，26の成形温度お
よび成形圧力は下記表に示す。The molding conditions of Examples 1 to 24 and Comparative Examples 1 to 24 were as follows: the temperature was 35 to 40 ° C., and the vacuum pressure was 600 to 750 mm /
Hg and the pressure is 10-20 kg / cm 2 . The viscosity of the extruded product is 0.5 to 20 × 10 5 poise (measured by a piston method). The molding temperatures and pressures of Examples 25 and 26 and Comparative Examples 25 and 26 are shown in the following table.
【００３４】なお、表中の水量およびメチルセルロース
の添加量は、II型無水石膏、繊維および充填材の合計量
に対して外割で、硬化促進剤の添加量は石膏に対して外
割で示す。The amount of water and the amount of methylcellulose in the table are based on the total amount of type II anhydrous gypsum, fiber and filler, and the amount of the hardening accelerator is based on the gypsum. .
【００３５】実施例および比較例における使用原料、試
験方法等は、下記の通りである。 ※使用原料 II型無水石膏 ：フッ酸無水石膏 粉末度5180cm
2 ／ｇ、pH2.4 パルプ ：粉砕品 ガラス繊維 ：日本電気硝子製 チョップドス
トランド６mm タルク ：伊藤産業社 硫酸カリウム ：工業薬品（チッソ製） 硫酸アルミニウム ：工業薬品（日本化学工業製）ア
ルミナ分17.1％ 硝酸ナトリウム ：工業薬品 炭酸ナトリウム ：工業薬品 塩化ナトリウム ：工業薬品 アルミン酸ナトリウム：工業薬品 メチルセルロース ：信越化学製 ハイメトローズ90
SH−15000The raw materials used, test methods, and the like in Examples and Comparative Examples are as follows. * Raw material used Type II anhydrous gypsum: Hydrofluoric anhydride gypsum Fineness 5180cm
2 / g, pH 2.4 Pulp: crushed product Glass fiber: Nippon Electric Glass chopped strand 6mm Talc: Ito Sangyo Co., Ltd. Potassium sulfate: Industrial chemicals (Chisso) Aluminum sulfate: Industrial chemicals (Nihon Kagaku Kogyo) alumina 17.1% Sodium nitrate: Industrial chemicals Sodium carbonate: Industrial chemicals Sodium chloride: Industrial chemicals Sodium aluminate: Industrial chemicals Methylcellulose: Shin-Etsu Chemical High Metrose 90
SH-15000
【００３６】 ※試験方法 比重 ：JIS A5418 「石綿セメントけい酸カルシウム板」に準 拠。（JIS におけるかさ比重を略称） 曲げ強度 ：JIS A5418 「石綿セメントけい酸カルシウム板」に準 拠。 材令５時間（未乾燥）湿潤状態で試験。 〃１日間（乾燥） 60℃24時間乾燥後に試験。 〃７日間（乾燥） 60℃24時間乾燥後に試験。 長さ変化率 ：JIS A5418 「石綿セメントけい酸カルシウム板」に準 拠。 水和率 ：粉砕試料を45℃で乾燥し、これを 200℃で仮焼して、 重量減少量から石膏の配合に対する水和率を測定。 成形性 ：押出成形時に成形の良否を目視観察して判定。 ○ 成形が良好 △ 温度の上昇等で長時間運転が不可能 × 増粘効果の低下で成形不可能 表面性 ：押出成形時に表面の良否を目視観察して判定 ○ 表面に欠陥がなく平滑 △ 表面にボイドによる欠陥が発生 × 大きなボイドによる欠陥が発生* Test method Specific gravity: Based on JIS A5418 "Asbestos cement calcium silicate plate". (Abbreviated as JIS bulk specific gravity) Flexural strength: Compliant with JIS A5418 “Asbestos cement calcium silicate plate”. Tested in wet condition for 5 hours (undried). 〃 1 day (dry) Tested after drying at 60 ° C for 24 hours. 〃 7 days (dry) Tested after drying at 60 ° C for 24 hours. Length change rate: Conforms to JIS A5418 “Asbestos cement calcium silicate plate”. Hydration rate: The ground sample was dried at 45 ° C, calcined at 200 ° C, and the hydration rate for the gypsum compound was measured from the weight loss. Moldability: Judgment by visual observation of molding quality during extrusion molding. ○ Good molding △ Long time operation is impossible due to temperature rise etc. × Molding is not possible due to decrease of thickening effect Surface property: Judge by visual observation of surface quality during extrusion molding ○ Smooth without defects on surface △ Surface Defects due to voids × defects due to large voids
【００３７】各々の実施例および比較例の原料配合およ
び成形板の性状試験結果を下記表１〜10に示す。The following Tables 1 to 10 show the blending of the raw materials and the results of the property test of the molded plates of the respective Examples and Comparative Examples.
【００３８】[0038]
【表１】 [Table 1]
【表２】 [Table 2]
【表３】 [Table 3]
【表４】 [Table 4]
【表５】 [Table 5]
【表６】 [Table 6]
【表７】 [Table 7]
【表８】 [Table 8]
【表９】 [Table 9]
【表１０】 [Table 10]
【００３９】[0039]
【発明の効果】本発明は、中和した無水石膏（pH 8.0〜
12.7）による押出成形製品の製造において、硬化促進材
として、硫酸カリウム、硫酸アルミニウムおよび１種類
以上のナトリウム塩類を添加する方法である。According to the present invention, neutralized anhydrous gypsum (pH 8.0 to
In the production of an extruded product according to 12.7), potassium sulfate, aluminum sulfate and one or more sodium salts are added as a curing accelerator.
【００４０】このような硬化促進剤を用いることによ
り、硬化の速度を早めて初期強度を高めることができ、
製造におけるハンドリング性が向上すると共に、製品と
しても高強度を得ることができる。特に、消石灰の存在
下の強アルカリ性の原料石膏を用いて、初期強度を発現
することができ、入手する無水石膏のロット変動に対し
ても、安定的に高強度が得られる。By using such a curing accelerator, the curing speed can be increased and the initial strength can be increased.
The handleability in manufacturing is improved, and high strength can be obtained as a product. In particular, the initial strength can be expressed by using a highly alkaline raw material gypsum in the presence of slaked lime, and a high strength can be stably obtained even when lots of anhydrous gypsum are obtained.
【００４１】また、硬化促進剤の塩類等による増粘剤の
機能低下が少なく、石膏板の製造に必要な増粘剤の添加
量を必要最少量程度とすることが可能となる。Further, the function of the thickener is hardly deteriorated due to salts of the curing accelerator and the like, and the amount of the thickener required for the production of the gypsum board can be reduced to the minimum necessary amount.
【００４２】すなわち、本発明の硬化促進剤は従来硬化
促進剤として使用されているカリミョウバンあるいはカ
リミョウバンと水溶性アルカリを組み合せたものよりも
増粘剤への影響が少なく、また初期の曲げ強度および製
品強度（材令７日間）の増進効果が一段と効果が大き
い。That is, the curing accelerator of the present invention has less influence on the thickening agent than the alum or the combination of alum and a water-soluble alkali conventionally used as a curing accelerator, and has an initial flexural strength. And the effect of increasing product strength (7 days of material age) is even greater.
【００４３】したがって、本発明の製造方法により得ら
れる石膏板は、高曲げ強度、遮音性、耐火性、加工性に
優れ、例えば大スパンの内装の間仕切壁等の内装用隔壁
材として好ましく用いることができる。Therefore, the gypsum board obtained by the production method of the present invention is excellent in high bending strength, sound insulation, fire resistance, and workability, and is preferably used as a partition wall material for a large-span interior partition wall or the like. Can be.
【表−１】 [Table-1]
【表−２】 [Table-2]
【表−３】 [Table-3]
【表−４】 [Table-4]
【表−５】 [Table-5]
【表−６】 [Table-6]
【表−７】 [Table-7]
【表−８】 [Table-8]
【表ー９】 [Table-9]
【表−１０】 [Table-10]
───────────────────────────────────────────────────── 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 14:04 24:38 22:08） ──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. 6 Identification number Agency reference number FI Technical display location C04B 14:42 14:04 24:38 22:08)
Claims (2)
材を原料とし、これに増粘剤を添加し、さらに上記II型
無水石膏の硬化促進剤として、硫酸カリウム、硫酸アル
ミニウムおよび１種類以上のナトリウム塩類を添加し、
押出成形することを特徴とする高強度石膏板の製造方
法。1. A type II anhydrous gypsum, slaked lime, fiber and filler are used as raw materials, a thickener is added to the raw material, and potassium sulfate, aluminum sulfate and at least one type of a curing accelerator for the type II anhydrous gypsum are added. Add the sodium salts of
A method for producing a high-strength gypsum board, characterized by extruding.
１種類以上のナトリウム塩類の合計の添加量が、II型無
水石膏に対して 1.0〜4.0 重量％であることを特徴とす
る請求項１記載の高強度石膏板の製造方法。2. High strength according to claim 1, wherein the total amount of potassium sulfate, aluminum sulfate and at least one kind of sodium salt is 1.0 to 4.0% by weight based on the type II anhydrous gypsum. Gypsum board manufacturing method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP41511590A JP2652726B2 (en) | 1990-12-27 | 1990-12-27 | Manufacturing method of high strength gypsum board |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP41511590A JP2652726B2 (en) | 1990-12-27 | 1990-12-27 | Manufacturing method of high strength gypsum board |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0733503A JPH0733503A (en) | 1995-02-03 |
| JP2652726B2 true JP2652726B2 (en) | 1997-09-10 |
Family
ID=18523521
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP41511590A Expired - Lifetime JP2652726B2 (en) | 1990-12-27 | 1990-12-27 | Manufacturing method of high strength gypsum board |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2652726B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021172974A1 (en) * | 2020-02-24 | 2021-09-02 | Daniel Davila Barrientos | Enhanced stable compositions based on synthetic anhydrite type ii, for the manufacture of construction units and mortars, methods for manufacturing same and uses thereof |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3988843B2 (en) * | 1997-03-24 | 2007-10-10 | 株式会社エーアンドエーマテリアル | Wet spray fireproof coating composition |
| JP3976452B2 (en) * | 1999-07-28 | 2007-09-19 | 電気化学工業株式会社 | Low environmental impact type high strength concrete |
| JP3976453B2 (en) * | 1999-07-28 | 2007-09-19 | 電気化学工業株式会社 | Low environmental impact type high strength concrete |
| JP4802255B2 (en) * | 2009-03-06 | 2011-10-26 | 吉野石膏株式会社 | Gypsum-based solidifying material mainly composed of a gypsum composition capable of suppressing hydrogen sulfide |
| MX353983B (en) * | 2010-08-09 | 2017-08-31 | Davila O´´Farril Tech S A De C V | A foamed or non-foamed stable composition based on anhydrite, portland cement, light and/or heavy fillers, activator additives, regulator additives and thickening additives, for covering, plastering and insulating walls, floor slabs and ceilings, and also for producing insulating structural elements, casting light and insulating ferro-cement structural systems, insulating piping, ducts, filling spaces, stabilizing floors and producing cement floors, for the construction industry. |
| JP5632768B2 (en) * | 2011-02-10 | 2014-11-26 | 吉野石膏株式会社 | Method for suppressing hydrogen sulfide generation |
| WO2014027613A1 (en) * | 2012-08-15 | 2014-02-20 | 吉野石膏株式会社 | Method for selectively inhibiting sulfate-reducing bacterium, gypsum composition capable of inhibiting proliferation of sulfate-reducing bacterium by said method, gypsum-type solidifying material, and gypsum-type building material |
-
1990
- 1990-12-27 JP JP41511590A patent/JP2652726B2/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021172974A1 (en) * | 2020-02-24 | 2021-09-02 | Daniel Davila Barrientos | Enhanced stable compositions based on synthetic anhydrite type ii, for the manufacture of construction units and mortars, methods for manufacturing same and uses thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0733503A (en) | 1995-02-03 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP2986986B2 (en) | Manufacturing method of high strength gypsum board | |
| CN107646025B (en) | Composition for metakaolin building materials, associated method for manufacturing said composition and use for producing building elements | |
| KR101432750B1 (en) | Mortar or concrete composition using fly ash and use thereof | |
| KR100690009B1 (en) | Various functional inorganic binder compound using industrial byproduct | |
| US20110178209A1 (en) | Manufacturing hydraulic cement aggregates for use in insulating and heat reflecting products | |
| JP2652726B2 (en) | Manufacturing method of high strength gypsum board | |
| JPS6353144B2 (en) | ||
| JP2009256112A (en) | Method for producing cured magnesia cement foam, cured foam obtained by the method, and molded object comprising the cured object | |
| EP3733628A1 (en) | Autoclaved cement compositions | |
| JP4894380B2 (en) | Method for producing hydraulic composition | |
| CN101423351A (en) | Novel plastering gypsum | |
| US4310358A (en) | Composition for forming inorganic hardened products and process for producing inorganic hardened products using the same | |
| KR101626297B1 (en) | Slag board containing circulating fluidized bed combustion ash and preparing method for the same | |
| PL234158B1 (en) | Composite cement-fibrous material with addition of ceramsite dust and its applications | |
| KR20180020021A (en) | Mortar composition not containing sand and use thereof | |
| JP2000072519A (en) | Low-alkalinity and high-strength cement composition | |
| JP4179789B2 (en) | Gypsum-based inorganic cured body and method for producing the same | |
| KR20160105642A (en) | Light-weigth hardened material composition using the industrial by-products and preparing method thereof | |
| KR970008736B1 (en) | Process for the preparation of slag board | |
| KR810000338B1 (en) | Process of producing fiber-reinforced hardened body of gypsum system | |
| KR100213328B1 (en) | Process for producing high-strength slag board | |
| JP2646278B2 (en) | Manufacturing method of inorganic cured molded products | |
| JP2899587B1 (en) | Cement-based extruded product and method for producing the same | |
| KR970008743B1 (en) | Composite composition | |
| SU1745712A1 (en) | Stock for manufacturing gypsum-boards |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| FPAY | Renewal fee payment (prs date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20080523 Year of fee payment: 11 |
|
| FPAY | Renewal fee payment (prs date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20090523 Year of fee payment: 12 |
|
| FPAY | Renewal fee payment (prs date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20100523 Year of fee payment: 13 |
|
| FPAY | Renewal fee payment (prs date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20110523 Year of fee payment: 14 |