JPH0597487A - Production of high strength gypsum plaster board - Google Patents
Production of high strength gypsum plaster boardInfo
- Publication number
- JPH0597487A JPH0597487A JP29078191A JP29078191A JPH0597487A JP H0597487 A JPH0597487 A JP H0597487A JP 29078191 A JP29078191 A JP 29078191A JP 29078191 A JP29078191 A JP 29078191A JP H0597487 A JPH0597487 A JP H0597487A
- Authority
- JP
- Japan
- Prior art keywords
- gypsum
- strength
- anhydrous gypsum
- thickener
- amount
- 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
Landscapes
- Press-Shaping Or Shaping Using Conveyers (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、II型無水石膏を主原料
とし押出成形により製造される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 gypsum board produced by extrusion molding using type II anhydrous gypsum as a main raw material.
【０００２】[0002]
【従来の技術】石膏を主原料とする押出成形板を、集合
住宅の戸境壁、事務所の間仕切壁などの内装の隔壁材と
して使用する場合は、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。2. Description of the Related Art When an extruded sheet mainly made of gypsum is used as a partition material for interiors such as boundary walls of apartment houses and partition walls of offices, it has high strength, aesthetics, sound insulation and heat insulation. Properties such as fire resistance, fire resistance, and workability are required.
【０００３】従来、石膏を主原料とした石膏板の製造方
法は、特公昭５１−２７６９３号、特公昭５４−１７７
７０号などに開示されている。特公昭５１−２７６９３
号には、各種の石膏に特定量の水と増粘剤を配合して、
混練し、押出成形する製造方法が開示されている。Conventionally, a method for producing a gypsum board using gypsum as a main raw material is disclosed in JP-B-51-27693 and JP-B-54-177.
No. 70 and the like. Japanese Patent Publication No. 51-27693
In the issue, various plasters were mixed with a specific amount of water and a thickener,
A manufacturing method of kneading and extrusion molding is disclosed.
【０００４】また特公昭５４−１７７７０号には、高強
度を発現させるために石膏としてII型無水石膏を用い、
増粘剤として押出成形性を向上させる効果のあるメチル
セルロースを用いた製造方法が開示されている。In Japanese Patent Publication No. 54-17770, type II anhydrous gypsum is used as gypsum in order to express high strength.
A production method using methyl cellulose having an effect of improving extrusion moldability as a thickener is disclosed.
【０００５】[0005]
【発明が解決しようとする課題】しかしながら、増粘剤
としてメチルセルロースを用いると、各種の塩類の共存
下で塩析を生じ、その機能が劣化するという問題があっ
た。すなわち、II型無水石膏を用いて石膏板を連続的に
製造する方法においては、石膏の硬化を促進し石膏板の
強度を向上させるために、多種類の硬化促進剤を多量に
用いなければならないが、硬化促進剤の多くは塩類であ
り、このためにメチルセルロースの機能劣化が起こり、
押出成形が不可能になる場合さえあった。従来は、硬化
促進剤の種類を限定すると共にその添加量を最小限度に
することによって、この問題に対処してきたが、結果と
して、石膏板の初期強度と製品強度は不満足なものであ
った。However, when methylcellulose is used as a thickener, there is a problem in that salting out occurs in the presence of various salts and the function thereof deteriorates. That is, in the method for continuously producing a gypsum board using type II anhydrous gypsum, in order to accelerate the hardening of gypsum and improve the strength of the gypsum board, a large amount of various kinds of hardening accelerators must be used. However, most of the curing accelerators are salts, which causes functional deterioration of methyl cellulose,
In some cases extrusion was even impossible. Conventionally, this problem has been dealt with by limiting the type of hardening accelerator and minimizing its addition amount, but as a result, the initial strength and product strength of the gypsum board were unsatisfactory.
【０００６】[0006]
【課題を解決するための手段】本発明者らは、II型無水
石膏を主原料とする石膏板の連続的製造方法において、
初期強度および製品強度を十分に得るために、硬化促進
剤の種類が限定されず、その添加量も制約されない製造
方法について鋭意研究した結果、本発明を完成したもの
である。すなわち本発明は、II型無水石膏に対して、硬
化促進剤、増粘剤、繊維などを配合し、必要に応じてさ
らに充填材などを配合して押出成形することによる高強
度石膏板の製造方法において、上記増粘剤としてヒドロ
キシエチルセルロースを使用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。[Means for Solving the Problems] The inventors of the present invention, in a continuous method for producing a gypsum board mainly composed of type II anhydrous gypsum,
The present invention has been completed as a result of earnest research on a production method in which the type of the curing accelerator is not limited and the addition amount thereof is not limited in order to obtain sufficient initial strength and product strength. That is, the present invention, for the type II anhydrous gypsum, a curing accelerator, a thickening agent, fibers and the like are blended, and if necessary, a filler and the like are further blended to produce a high-strength gypsum board by extrusion molding. In the method, there is provided a method for producing a high-strength gypsum board, characterized by using hydroxyethyl cellulose as the thickening agent.
【０００７】上記製造方法において、硬化促進剤の添加
量は、好ましくはII型無水石膏に対して外割りで１．０
〜７．０重量％であり、ヒドロキシエチルセルロースの
添加量は、硬化促進剤を除いた全体量に対して、好まし
くは外割りで０．２〜４．０重量％である。In the above production method, the amount of the hardening accelerator added is preferably 1.0 based on the proportion of type II anhydrous gypsum.
The amount of hydroxyethyl cellulose added is preferably 0.2 to 4.0% by weight, as an outer percentage, with respect to the total amount excluding the curing accelerator.
【０００８】上記II型無水石膏（以下、無水石膏とい
う。）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、あるいはリン酸など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。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は、これに消石灰の粉末を添加
し、中和して用いる。消石灰の添加量は、石膏の酸性度
合によって異なるが、通常０．１〜３．０重量％程度で
あり、無水石膏粉末のｐＨが６〜１２．７程度になるよ
うにする。Examples of the type II anhydrous gypsum (hereinafter referred to as anhydrous gypsum) include natural gypsum, anhydrous gypsum which is a by-product during hydrofluoric acid production, or calcined dihydrate gypsum during the production of chemical gypsum such as phosphoric acid. Can be used. Anhydrous gypsum, which is a by-product in the production of chemical products, cannot be used until that time because a small amount of free acid remains during production and the pH is in an acidic state. Therefore, in the present invention,
Such anhydrous gypsum powder is used by adding slaked lime powder thereto and neutralizing it. Although the amount of slaked lime added varies depending on the acidity of the gypsum, it is usually about 0.1 to 3.0% by weight, and the pH of the anhydrous gypsum powder is set to about 6 to 12.7.
【０００９】無水石膏の配合量は、通常、原料の全量に
対して３０〜９０重量％である。この配合量は、製品設
計によって決められるが、３０重量％以下では初期強度
および製品強度が得られない。また、９０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 content of anhydrous gypsum is usually 30 to 90% by weight based on the total amount of raw materials. This amount is determined by the product design, but if it is 30% by weight or less, the initial strength and product strength cannot be obtained. On the other hand, if the content is more than 90% by weight, not only the effect of increasing the strength reaches the ceiling but also the hardness becomes too high and the workability deteriorates.
【００１０】上記硬化促進剤としては、塩化ナトリウ
ム、塩化カリウム、塩化マグネシウム、塩化カルシウ
ム、塩化アルミニウムなどの塩類、硫酸ナトリウム、硫
酸カリウム、硫酸マグネシウム、硫酸アルミニウム等の
硫酸塩、カリミョウバン、ナトリウムミョウバンなどの
ミョウバン類、硝酸ナトリウム、硝酸カリウム、硝酸マ
グネシウム、硝酸アルミニウムの硝酸塩、硫酸水素ナト
リウム、硫酸水素カリウムなどの酸水素塩および、アル
ミン酸ナトリウム、炭酸ナトリウム、炭酸水素ナトリウ
ムなどの塩基類を単独であるいは組合せて用いることが
できる。通常は、これらを数種類を組合せて用いる。Examples of the curing accelerator include salts such as sodium chloride, potassium chloride, magnesium chloride, calcium chloride and aluminum chloride, sulfates such as sodium sulfate, potassium sulfate, magnesium sulfate and aluminum sulfate, potassium alum, sodium alum and the like. Alums, sodium nitrate, potassium nitrate, magnesium nitrate, aluminum nitrate nitrate, oxyhydrogen salts such as sodium hydrogensulfate and potassium hydrogensulfate, and bases such as sodium aluminate, sodium carbonate and sodium hydrogencarbonate, alone or in combination. Can be used. Usually, these are used in combination of several kinds.
【００１１】硬化促進剤は、通常、無水石膏に対して外
割で合計１．０〜７．０重量％添加される。硬化促進剤
を好ましくは２種類以上組み合わせて、無水石膏に対し
て合計で１．０〜７．０重量％添加することによって、
消石灰の存在下およびｐＨが６．０〜１２．７程度の範
囲で変動しても、曲げ強度の発現の効果が高く、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した性状の石膏板が得られ
る。硬化促進剤量が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７．０％を越えると、強度増進の効果が頭打ち
となる。The hardening accelerator is usually added to the anhydrous gypsum in a total amount of 1.0 to 7.0% by weight. A combination of two or more curing accelerators is preferably added in a total amount of 1.0 to 7.0% by weight based on the anhydrous gypsum,
Even in the presence of slaked lime and when the pH fluctuates in the range of about 6.0 to 12.7, the effect of exhibiting bending strength is high, and in particular,
A gypsum board that contributes greatly to the development of initial strength for 5 hours to 1 day and has stable properties with little variation can be obtained. When the amount of the curing accelerator is 1.0% or less, the initial strength required for handling and the required strength as a product cannot be obtained, and when it exceeds 7.0%, the effect of increasing the strength reaches the ceiling.
【００１２】本発明においては、増粘剤としてヒドロキ
シエチルセルロースを用いる。ヒドロキシエチルセルロ
ースは、セルロースにエチレンオキサイドを付加したも
のであり、その置換度は、通常０．５〜３であり、好ま
しくは１〜２である。また、２％水溶液の粘度は１，０
００〜５００，０００ｃｐｓ程度である。ヒドロキシエ
チルセルロースの添加量は、原料の全体量（硬化促進剤
量は除く）に対して外割で０．２〜４．０重量％であ
る。添加量が０．２重量％以下では、増粘効果が少な
く、４．０重量％以上添加しても、それ以上の効果は期
待できない。In the present invention, hydroxyethyl cellulose is used as a thickening agent. Hydroxyethyl cellulose is obtained by adding ethylene oxide to cellulose, and the substitution degree thereof is usually 0.5 to 3, and preferably 1 to 2. Also, the viscosity of a 2% aqueous solution is 1.0
It is about 00 to 500,000 cps. The amount of hydroxyethyl cellulose added is 0.2 to 4.0% by weight based on the total amount of the raw materials (excluding the amount of the curing accelerator). If the addition amount is 0.2% by weight or less, the thickening effect is small, and even if it is added in an amount of 4.0% by weight or more, no further effect can be expected.
【００１３】本発明においては、ヒドロキシエチルセル
ロースと共に、必要に応じてデンプンなどの天然高分子
類、メチルセルロースなどのセルロースエーテル類およ
びポリエチレンオキサイドなどの合成高分子類からなる
汎用の増粘剤を併用することができる。併用する増粘剤
の添加量は、０〜２．０重量％程度である。In the present invention, a general-purpose thickener comprising natural polymers such as starch, cellulose ethers such as methyl cellulose and synthetic polymers such as polyethylene oxide is used together with hydroxyethyl cellulose, if necessary. You can The addition amount of the thickener used together is about 0 to 2.0% by weight.
【００１４】上記繊維は通常非石綿系であり、その例と
しては、パルプなどの天然繊維、ガラス繊維、炭素繊維
などの無機繊維、アクリル、ビニロン、ナイロン、ポリ
プロピレンなどの合成繊維などが挙げられる。これらの
繊維は、無水石膏に対して２〜１０重量％程度の割合で
配合される。The above fibers are usually non-asbestos, and examples thereof include natural fibers such as pulp, inorganic fibers such as glass fibers and carbon fibers, and synthetic fibers such as acrylic, vinylon, nylon and polypropylene. These fibers are blended in a proportion of about 2 to 10% by weight with respect to anhydrous gypsum.
【００１５】本発明においては、必要に応じて充填剤が
配合される。充填剤としては、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、粘土などの粉末を
用いることができ、これらは無水石膏に対して０〜６８
重量％の割合で配合される。In the present invention, a filler is blended if necessary. As the filler, powders of general-purpose silica stone, limestone, dihydrate gypsum, talc, slag, fly ash, diatomaceous earth, zeolite, wollastonite, mica, clay and the like can be used, and these can be used with respect to anhydrous gypsum. ~ 68
It is blended in a weight percentage.
【００１６】本発明の製造方法における押出成形条件
は、原料の配合組成、成形体の大きさや形状、押出成形
機の機種などによって異なるが、通常、温度が２０〜６
０℃程度であり、真空圧が５００〜７６０ｍｍ／Ｈｇで
あり、圧力が５〜８０ｋｇ／ｃｍ2 である。また、押出
成形物の粘度は、０．１〜５０×１０5 ｐｏｉｓｅであ
る。The extrusion molding conditions in the production method of the present invention differ depending on the compounding composition of the raw materials, the size and shape of the molded product, the model of the extruder, etc., but the temperature is usually 20 to 6
The temperature is about 0 ° C., the vacuum pressure is 500 to 760 mm / Hg, and the pressure is 5 to 80 kg / cm 2 . The viscosity of the extruded product is 0.1 to 50 × 10 5 poise.
【００１７】なお、本発明の石膏板の製造方法は、各種
塩類の遅延剤を添加して成形する半水石膏系にも、応用
できる。The method for producing a gypsum board of the present invention can also be applied to a hemihydrate gypsum system in which a retarder for various salts is added and molded.
【００１８】[0018]
【作用】本発明は、無水石膏に対して、硬化促進剤、増
粘剤、繊維、繊維および必要に応じて充填剤などを配合
して、押出成形品を製造する製造方法において、増粘剤
としてヒドロキシエチルセルロースを用いることを特徴
とするものである。The present invention provides a thickening agent in a method for producing an extruded product by adding a hardening accelerator, a thickening agent, fibers, fibers and, if necessary, a filler to anhydrous gypsum. Is characterized by using hydroxyethyl cellulose.
【００１９】従来の製造方法においては、無水石膏は硬
化が遅く、特に、強アルカリ下においては、硬化促進剤
を添加しても初期強度および製品強度が劣っていた。さ
らに、押出成形を行う際には、成形性の面から増粘剤が
必須であるが、従来増粘剤として使用されていたメチル
セルロースは、硬化促進剤の塩類によって機能劣化を生
じて、増粘効果の低下をきたし、押出成形が不可能にな
る場合もあった。このため、従来は硬化促進剤の量を必
要最少限の量とし、メチルセルロースをできるだけ多量
に添加することにより、この欠点をカバーしてきた。し
かし、結果的には、初期強度および製品強度が不十分で
あった。In the conventional production method, the anhydrous gypsum is slow to cure, and particularly under strong alkali, the initial strength and the product strength are poor even if the hardening accelerator is added. Furthermore, when performing extrusion molding, a thickener is essential from the viewpoint of moldability, but methyl cellulose, which has been used as a thickener in the past, causes functional deterioration due to salts of a curing accelerator, resulting in thickening. In some cases, the effect was reduced and extrusion molding was impossible. Therefore, conventionally, this drawback has been covered by limiting the amount of the curing accelerator to the necessary minimum amount and adding methyl cellulose as much as possible. However, as a result, the initial strength and the product strength were insufficient.
【００２０】ところが本発明によれば、増粘剤としてヒ
ドロキシエチルセルロースを使用することにより、硬化
促進剤による劣化をなくし、増粘剤の性能を最大限に発
揮させることが可能となり、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できるように
なった。また、本発明によれば、硬化促進剤の種類が限
定されず、大量に添加することも可能になり、初期強度
および製品強度に優れる高強度石膏板が得られるように
なった。However, according to the present invention, by using hydroxyethyl cellulose as a thickener, it becomes possible to eliminate deterioration due to a curing accelerator and to maximize the performance of the thickener, and anhydrous gypsum is used. The extruded product can be continuously produced for a long time. Further, according to the present invention, the type of the curing accelerator is not limited, and it is possible to add a large amount, so that a high-strength gypsum board excellent in initial strength and product strength can be obtained.
【００２１】また、ヒドロキシエチルセルロースは、増
粘効果の高いことから、非石綿系の繊維を用いても、成
形時に押出の口金部分で十分に圧密され、空隙の少ない
成形体が得られるようになった。これらの効果により、
得られる石膏板の比重、初期強度および製品強度が向上
した。また、ヒドロキシエチルセルロースは石膏の水和
に悪影響を及ぼすことがなく、水和率も向上した。Further, since hydroxyethyl cellulose has a high thickening effect, even if non-asbestos fibers are used, it is sufficiently compacted at the die part of the extrusion at the time of molding, and a molded product with few voids can be obtained. It was Due to these effects,
The specific gravity, initial strength and product strength of the obtained gypsum board were improved. In addition, hydroxyethyl cellulose did not adversely affect the hydration of gypsum, and the hydration rate was improved.
【００２２】したがって、本発明の製造方法によれば、
高比重、高曲げ強度、遮音性、耐火性および加工性に優
れた石膏板を得ることが可能で、例えば、長さ２〜６ｍ
程度の大スパンの内装の間仕切壁などを製造することが
できる。Therefore, according to the manufacturing method of the present invention,
It is possible to obtain a plaster board with high specific gravity, high bending strength, sound insulation, fire resistance, and workability, for example, a length of 2 to 6 m.
It is possible to manufacture interior partition walls with a large span.
【００２３】[0023]
実施例１〜１２；比較例１〜１０：無水石膏に消石灰を
１．８％添加して、ｐＨを１２．２に調節した。この無
水石膏７０重量％、パルプ６重量％、ガラス繊維１重量
％、ワラストナイト８重量％、タルク１５重量％および
表１および２に示す硬化促進剤、ヒドロキシエチルセル
ロースを配合した原料を、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、ついで混練
物をスクリュー型真空押出成形機で厚さ１０、幅２００
ｍｍに連続的に成形した。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。７日間硬化させ
たのちの成形板を、６０℃で乾燥し、基準寸法に切断し
て、以下の試験に供した。Examples 1 to 12; Comparative Examples 1 to 10: 1.8% of slaked lime was added to anhydrous gypsum to adjust the pH to 12.2. A raw material containing 70% by weight of anhydrous gypsum, 6% by weight of pulp, 1% by weight of glass fiber, 8% by weight of wollastonite, 15% by weight of talc and the curing accelerator shown in Tables 1 and 2 and hydroxyethyl cellulose was used as an Erich type. Mix for 1 minute in a mixer at high speed and dry-mix, add water necessary for molding with a kneader, knead for 10 minutes to uniformly disperse, and then knead the mixture with a screw type vacuum extruder to obtain a thickness of 10 and a width of 200.
It was continuously molded into mm. The obtained molded plate was hydrated and cured at room temperature of about 15 ° C. until each age. The molded plate after curing for 7 days was dried at 60 ° C., cut into standard dimensions, and subjected to the following tests.
【００２４】各々の実施例および比較例の原料配合、成
形時の性状および硬化体の性状および試験結果を表１〜
表２に示す。なお、表１および表２中には、水および増
粘剤の配合割合（重量％）は、無水石膏、繊維、ワラス
トナイトおよびタルクの合計量に対する外割で、硬化促
進剤の配合割合（重量％）は、無水石膏に対して外割で
示されている。The raw material blends, properties at the time of molding, properties of the cured product, and test results of each Example and Comparative Example are shown in Tables 1 to 1.
It shows in Table 2. In Tables 1 and 2, the mixing ratio (% by weight) of water and the thickening agent is a proportion of the total amount of anhydrous gypsum, fiber, wollastonite, and talc, and the mixing ratio of the curing accelerator ( (% By weight) is shown by the external ratio with respect to the anhydrous gypsum.
【表１】 [Table 1]
【表２】 [Table 2]
【００２５】実施例および比較例における使用原料、試
験方法などは、下記の通りである。 ※使用原料 無水石膏 ：フッ酸無水石膏 粉末度５３４０ｃ
ｍ2 ／ｇ、ｐＨ２．７ 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ワラストナイト ：インド産 タルク ：伊藤産業社 硫酸カリウム ：工業薬品 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％ アルミン酸ナトリウム：工業薬品 ヒドロキシエチルセルロース：ダイセル化学工業製 メチルセルロース：信越化学工業製 ハイメトローズ９
０ＳＨ−１５０００ ※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。 材令７日間（乾燥） ６０℃２４時間乾燥後に試験。 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。 成形時のｐＨ ：生成形試料５ｇを５０ｃｃの水で分
散して測定。 成形時の温度 ：押出成形直後に成形体を測定。 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 △ 増粘効果の低下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Raw materials used in Examples and Comparative Examples, test methods and the like are as follows. * Raw material used Anhydrous gypsum: Hydrofluoric acid anhydrous gypsum Fineness 5340c
m 2 / g, pH 2.7 Pulp: Grinded product Glass fiber: Nippon Electric Glass chopped strand 6 mm wollastonite: Indian talc: Ito Sangyo Co., Ltd. potassium sulfate: Industrial chemicals Aluminum sulfate: Industrial chemicals (Nippon Kagaku Kogyo) alumina Min 17.1% Sodium aluminate: Industrial chemicals Hydroxyethyl cellulose: Daicel Chemical Industries, Ltd. Methyl cellulose: Shin-Etsu Chemical Industries High Metroses 9
0SH-15000 * Test method Specific gravity: Based on JIS A5418 "Asbestos cement calcium silicate board". (Abbreviated as bulk specific gravity in JIS) Bending strength: In accordance with JIS A5418 “Asbestos cement calcium silicate board”. Tested in wet condition for 5 hours (undried). Material age 7 days (dry) Tested after drying at 60 ° C for 24 hours. Hydration rate: The crushed sample was dried at 45 ° C, calcined at 200 ° C, and the hydration rate for the composition of gypsum was measured from the amount of weight loss. PH during molding: Measured by dispersing 5 g of the product type sample in 50 cc of water. Molding temperature: Measure the molded body immediately after extrusion molding. Moldability: Determined by visually observing the quality of molding during extrusion molding. ○ Good molding △ Long-term operation is not possible due to decreased viscosity increasing effect × Molding is not possible due to decreased viscosity increasing effect Surface property: Determined by visually observing the quality of the surface during extrusion molding. ○ No surface defects and smooth △ Surface defects caused by voids × Large defects caused by voids
【００２６】[0026]
【発明の効果】本発明によれば、無水石膏を主原料とし
て、増粘剤としてヒドロキシエチルセルロースを使用す
ることにより、硬化促進剤による増粘剤の機能劣化を防
止して、増粘剤の性能を最大限に発揮させることができ
る。また、硬化促進剤の種類も限定されなくなり、多量
に配合することも可能になるため、多種類の硬化促進剤
を組合せて、所望量使用することができるようになる。
これらのことで、無水石膏を利用した押出成形製品にお
いて、非石綿系の繊維を用いた場合においても、良好な
成形性および表面性が得られ、また、気温にも左右され
ずに長時間、連続的に生産することが可能となる。EFFECT OF THE INVENTION According to the present invention, by using anhydrous gypsum as a main raw material and using hydroxyethyl cellulose as a thickener, it is possible to prevent the functional deterioration of the thickener due to the curing accelerator and to improve the performance of the thickener. Can be maximized. Further, the type of the curing accelerator is not limited, and a large amount of the curing accelerator can be blended, so that it becomes possible to use a desired amount by combining various types of curing accelerators.
Due to these, in the extrusion molded product using anhydrous gypsum, even when using non-asbestos fibers, good moldability and surface property are obtained, and long time without being affected by the temperature, It is possible to produce continuously.
【００２７】さらに、比重、初期強度、製品強度および
水和率が向上し、特に、強アルカリ性の原料石膏を用い
ても初期強度を発現させることができるようになり、入
手する無水石膏のロット変動にかかわりなく、安定した
高強度の石膏製品が得られる。Further, the specific gravity, the initial strength, the product strength and the hydration rate are improved, and in particular, the initial strength can be exhibited even when a strong alkaline raw material gypsum is used. A stable and high-strength gypsum product can be obtained regardless of.
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.5 識別記号 庁内整理番号 ＦＩ 技術表示箇所 Ｃ０４Ｂ 16:02 Ｚ 2102−4Ｇ 22:14 Ａ 2102−4Ｇ 22:08 Ｚ 2102−4Ｇ 24:38） Ｂ 2102−4Ｇ (72)発明者 山岸 弘征 東京都港区芝大門２丁目12番10号 淺野ス レート株式会社内─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. 5 Identification code Office reference number FI technical display location C04B 16:02 Z 2102-4G 22:14 A 2102-4G 22:08 Z 2102-4G 24:38 ) B 2102-4G (72) Inventor Hiroyuki Yamagishi 2-12-10 Shibadaimon, Minato-ku, Tokyo Inside the Asano Slate Co., Ltd.
Claims (2)
剤、繊維などを配合し、押出成形することによる高強度
石膏板の製造方法において、上記増粘剤としてヒドロキ
シエチルセルロースを使用することを特徴とする高強度
石膏板の製造方法。1. A method for producing a high-strength gypsum board by blending a hardening accelerator, a thickener, fibers and the like with type II anhydrous gypsum and using extrusion molding, wherein hydroxyethyl cellulose is used as the thickener. A method for producing a high-strength gypsum board characterized by the above.
対して外割りで１．０〜７．０重量％であり、ヒドロキ
シエチルセルロースの添加量が硬化促進剤を除いた全体
量に対して外割りで０．２〜４．０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. The amount of the curing accelerator added is 1.0 to 7.0% by weight based on the type II anhydrous gypsum, and the amount of hydroxyethyl cellulose added is the total amount excluding the curing accelerator. On the other hand, the outer ratio is 0.2 to 4.0% by weight, and the method for producing a high-strength gypsum board according to claim 1, which is characterized in that.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3290781A JP2986986B2 (en) | 1991-10-09 | 1991-10-09 | Manufacturing method of high strength gypsum board |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3290781A JP2986986B2 (en) | 1991-10-09 | 1991-10-09 | Manufacturing method of high strength gypsum board |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0597487A true JPH0597487A (en) | 1993-04-20 |
| JP2986986B2 JP2986986B2 (en) | 1999-12-06 |
Family
ID=17760431
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3290781A Expired - Lifetime JP2986986B2 (en) | 1991-10-09 | 1991-10-09 | Manufacturing method of high strength gypsum board |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2986986B2 (en) |
Cited By (19)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10194812A (en) * | 1996-12-26 | 1998-07-28 | M & K:Kk | Diatom-woody fiber cement board |
| JP2001039759A (en) * | 1999-07-28 | 2001-02-13 | Denki Kagaku Kogyo Kk | Low environmental load type high strength concrete |
| JP2001039760A (en) * | 1999-07-28 | 2001-02-13 | Denki Kagaku Kogyo Kk | Low environmental load type high strength concrete |
| JP2001327941A (en) * | 2000-05-23 | 2001-11-27 | Yoshino Gypsum Co Ltd | Gypsum building material |
| JP2005238572A (en) * | 2004-02-25 | 2005-09-08 | Earth Engineering:Kk | Building interior material and its manufacturing method |
| JP2009221065A (en) * | 2008-03-18 | 2009-10-01 | Ube Ind Ltd | Hydraulic composition and concrete floor structure using the same |
| JP2009263218A (en) * | 2008-03-31 | 2009-11-12 | A & A Material Corp | Gypsum-based molded body, and method for producing the same |
| JP2015527966A (en) * | 2012-06-29 | 2015-09-24 | インテレクチュアル ゴリラ ビー．ブイ．Ｉｎｔｅｌｌｅｃｔｕａｌ Ｇｏｒｉｌｌａ Ｂ．Ｖ． | Gypsum composite material used for fireproof building materials |
| CN107915461A (en) * | 2017-12-19 | 2018-04-17 | 安徽省皖北煤电集团有限责任公司含山恒泰非金属材料分公司 | A kind of natural anhydrite base light internal wall plastering gupsum material and preparation method thereof |
| US10077597B2 (en) | 2012-06-29 | 2018-09-18 | The Intellectual Gorilla Gmbh | Fire rated door |
| US10196309B2 (en) | 2013-10-17 | 2019-02-05 | The Intellectual Gorilla Gmbh | High temperature lightweight thermal insulating cement and silica based materials |
| US10315386B2 (en) | 2012-06-29 | 2019-06-11 | The Intellectual Gorilla Gmbh | Gypsum composites used in fire resistant building components |
| US10414692B2 (en) | 2013-04-24 | 2019-09-17 | The Intellectual Gorilla Gmbh | Extruded lightweight thermal insulating cement-based materials |
| US10442733B2 (en) | 2014-02-04 | 2019-10-15 | The Intellectual Gorilla Gmbh | Lightweight thermal insulating cement based materials |
| US10538459B2 (en) | 2014-06-05 | 2020-01-21 | The Intellectual Gorilla Gmbh | Extruded cement based materials |
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| US10662113B2 (en) | 2014-11-21 | 2020-05-26 | Saint-Gobain Placo | Fire-resistant calcium sulphate-based products |
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Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6451359A (en) * | 1987-08-19 | 1989-02-27 | Asano Slate Co Ltd | Production of molded gypsum board |
-
1991
- 1991-10-09 JP JP3290781A patent/JP2986986B2/en not_active Expired - Lifetime
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6451359A (en) * | 1987-08-19 | 1989-02-27 | Asano Slate Co Ltd | Production of molded gypsum board |
Cited By (26)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10194812A (en) * | 1996-12-26 | 1998-07-28 | M & K:Kk | Diatom-woody fiber cement board |
| JP2001039759A (en) * | 1999-07-28 | 2001-02-13 | Denki Kagaku Kogyo Kk | Low environmental load type high strength concrete |
| JP2001039760A (en) * | 1999-07-28 | 2001-02-13 | Denki Kagaku Kogyo Kk | Low environmental load type high strength concrete |
| JP2001327941A (en) * | 2000-05-23 | 2001-11-27 | Yoshino Gypsum Co Ltd | Gypsum building material |
| JP2005238572A (en) * | 2004-02-25 | 2005-09-08 | Earth Engineering:Kk | Building interior material and its manufacturing method |
| JP4532932B2 (en) * | 2004-02-25 | 2010-08-25 | 株式会社アースエンジニアリング | Architectural interior materials |
| JP2009221065A (en) * | 2008-03-18 | 2009-10-01 | Ube Ind Ltd | Hydraulic composition and concrete floor structure using the same |
| JP2009263218A (en) * | 2008-03-31 | 2009-11-12 | A & A Material Corp | Gypsum-based molded body, and method for producing the same |
| US10315386B2 (en) | 2012-06-29 | 2019-06-11 | The Intellectual Gorilla Gmbh | Gypsum composites used in fire resistant building components |
| US10077597B2 (en) | 2012-06-29 | 2018-09-18 | The Intellectual Gorilla Gmbh | Fire rated door |
| JP2015527966A (en) * | 2012-06-29 | 2015-09-24 | インテレクチュアル ゴリラ ビー．ブイ．Ｉｎｔｅｌｌｅｃｔｕａｌ Ｇｏｒｉｌｌａ Ｂ．Ｖ． | Gypsum composite material used for fireproof building materials |
| US10435941B2 (en) | 2012-06-29 | 2019-10-08 | The Intellectual Gorilla Gmbh | Fire rated door core |
| US10876352B2 (en) | 2012-06-29 | 2020-12-29 | The Intellectual Gorilla Gmbh | Fire rated door |
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| US10196309B2 (en) | 2013-10-17 | 2019-02-05 | The Intellectual Gorilla Gmbh | High temperature lightweight thermal insulating cement and silica based materials |
| US10442733B2 (en) | 2014-02-04 | 2019-10-15 | The Intellectual Gorilla Gmbh | Lightweight thermal insulating cement based materials |
| US11155499B2 (en) | 2014-02-04 | 2021-10-26 | The Intellectual Gorilla Gmbh | Lightweight thermal insulating cement based materials |
| US11072562B2 (en) | 2014-06-05 | 2021-07-27 | The Intellectual Gorilla Gmbh | Cement-based tile |
| US10538459B2 (en) | 2014-06-05 | 2020-01-21 | The Intellectual Gorilla Gmbh | Extruded cement based materials |
| US10584063B2 (en) | 2014-11-21 | 2020-03-10 | Saint-Gobain Placo | Fire resistant calcium sulphate-based products |
| US11117835B2 (en) | 2014-11-21 | 2021-09-14 | Saint-Gobain Placo | Fire resistant calcium sulphate-based products |
| US11117834B2 (en) | 2014-11-21 | 2021-09-14 | Saint-Gobain Placo | Calcium sulphase-based products |
| US10662113B2 (en) | 2014-11-21 | 2020-05-26 | Saint-Gobain Placo | Fire-resistant calcium sulphate-based products |
| US11198645B2 (en) | 2014-11-21 | 2021-12-14 | Saint-Gobain Placo | Fire resistant calcium sulphate-based products |
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