JPH1112019A - Gypsum board for interior wall and its production - Google Patents
Gypsum board for interior wall and its productionInfo
- Publication number
- JPH1112019A JPH1112019A JP16427297A JP16427297A JPH1112019A JP H1112019 A JPH1112019 A JP H1112019A JP 16427297 A JP16427297 A JP 16427297A JP 16427297 A JP16427297 A JP 16427297A JP H1112019 A JPH1112019 A JP H1112019A
- Authority
- JP
- Japan
- Prior art keywords
- gypsum
- parts
- cement
- weight
- gypsum board
- 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.)
- Pending
Links
Landscapes
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は石膏とセメントを主
材とし無機質粉末とパルプ繊維、吸放湿性物質を添加し
てなる内装壁用石膏ボード及びその製造方法に関するも
のであり、特に、その表面精度及び吸放湿性を向上させ
たものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gypsum board for an interior wall comprising gypsum and cement as main components, an inorganic powder, pulp fiber, and a moisture absorbing / releasing substance, and a method for producing the same. It has improved accuracy and moisture absorption / release properties.
【０００２】[0002]
【従来の技術】一般に建築内装材料として用いられる石
膏系ボードとしては、例えば紙を配合した石こうボー
ド、ガラス繊維，パルプ，故紙，木質フレーク等を配合
してなる繊維複合石膏ボード等が知られているが、吸放
湿性能としての効果は極めて少ない。また、吸放湿性能
を有する内装材としては、美術館、博物館、展示室、一
般住宅等において、主として内装下地材として使用され
ている石膏ボードがある。石膏系ボード以外では、特に
美術館、博物館、展示室に置かれている貴重な美術品や
資料等の保存性を良好にするために、特に室内に湿度変
動のないように、空調設備が利用されていることは勿論
のこと、吸放湿性能に優れた特性を呈する木質材による
内装材が使用されている。2. Description of the Related Art As a gypsum board generally used as a building interior material, for example, a gypsum board mixed with paper, a fiber composite gypsum board mixed with glass fiber, pulp, waste paper, wood flake, and the like are known. However, the effect as moisture absorption / release performance is extremely small. Further, as an interior material having a moisture absorbing and releasing performance, there is a gypsum board mainly used as an interior base material in an art museum, a museum, an exhibition room, a general house and the like. In addition to gypsum-based boards, air-conditioning equipment is used to ensure the preservation of precious artworks and materials, especially in museums, museums, and exhibition rooms, so that there is no fluctuation in humidity, especially in the room. Needless to say, wood-based interior materials exhibiting excellent characteristics of absorbing and releasing moisture are used.
【０００３】このうち故紙と石膏とを主体としてなる複
合石膏ボードはＧＰＢ （ＧｙｐｓｕｍＰｕｌｐ Ｂｏ
ａｒｄ）と一般に称されている。この従来の石膏ボード
の製造方法の一例を示すと、β型半水石膏を主体とし、
これに古新聞，古雑誌等の故紙を乾式粉砕してパルプ状
とした後、水を加えてスラリー状とし、湿式法でミキシ
ング及びフォーミングして板状に成型することにより得
られる。この得られる複合石膏ボードは釘、ねじ等が使
用可能であると共に、鋸を用いての切断が可能であり、
強度の点でも石膏を芯材としボード用紙でサンドイッチ
状としたいわゆる石膏ボードに比べ、方向による強度差
がなく、曲げ強さが高く、性能に優れている。Of these, composite gypsum board mainly composed of waste paper and gypsum is GPB (Gypsum Pulp Bo).
ard). To show an example of the method of manufacturing this conventional gypsum board, mainly β-type hemihydrate gypsum,
This is obtained by dry-pulverizing waste paper such as old newspapers and old magazines into a pulp form, adding water to make a slurry form, and mixing and forming by a wet method to form a plate form. The resulting composite gypsum board can use nails, screws, etc., and can be cut using a saw,
Also in terms of strength, there is no difference in strength depending on the direction, the bending strength is high, and the performance is excellent, as compared with a so-called gypsum board made of gypsum as a core material and sandwiched with board paper.
【０００４】[0004]
【発明が解決しようとする課題】しかしながら従来のβ
型半水石膏を用いて湿式法によって得られる複合石膏ボ
ード（ＧＰＢ）は、得られる成型体中にパルプ同志が凝
集して形成されたいわゆるダマと称される凝集物が混在
しており、この凝集物の発生率が多いほど原材料の分布
が不均一であるため、ボード曲げ強さが低下すると共
に、製品の表面精度が悪いという問題がある。この問題
の解決方法として、特開平４−３００２３２号公報によ
り提案されているが、満足するものを得ることはできな
いのが現状である。一方、吸放湿性能に関してはなんら
具備されておらず、無いに等しいのが現状である。However, the conventional β
In a composite gypsum board (GPB) obtained by a wet method using a mold hemihydrate gypsum, aggregates called so-called lumps formed by aggregation of pulp are mixed in the obtained molded body. Since the distribution of the raw materials becomes more uneven as the generation rate of the aggregates increases, there is a problem that the board bending strength is reduced and the surface accuracy of the product is poor. As a solution to this problem, Japanese Patent Application Laid-Open No. Hei 4-300232 has been proposed, but at present it is impossible to obtain a satisfactory solution. On the other hand, there is no moisture absorption / desorption performance, which is equivalent to none at present.
【０００５】[0005]
【課題を解決するための手段】本発明は、石膏とセメン
トを主材とし無機質粉末と繊維及び吸放湿性物質を用い
ることにより、表面精度及び吸放湿性を向上させること
を見出したのである。即ち、本発明は石膏とセメントと
無機質粉末と繊維及び吸放湿性物質からなる内装壁用石
膏ボード、及び石膏とセメントと無機質粉末と繊維及び
吸放湿性物質に水を加えて混合し、型枠へ流し込み、又
は、フォーミングし、次いでプレス成形し養生硬化させ
ることを特徴とする内装壁用石膏ボードの製造方法に関
する。According to the present invention, it has been found that the surface accuracy and the moisture absorption / release properties are improved by using gypsum and cement as main components and using inorganic powders, fibers and moisture absorbing / releasing substances. That is, the present invention provides a gypsum board for an interior wall composed of gypsum, cement, inorganic powder, fiber, and a hygroscopic substance, and adding and mixing water to gypsum, cement, inorganic powder, fiber, and a hygroscopic substance, and forming a mold. The present invention relates to a method for producing a gypsum board for an interior wall, wherein the method is performed by pouring or forming, followed by press molding and curing.
【０００６】[0006]
【発明の実施の形態】以下、本発明を詳細に説明する。
本発明に用いる石膏は、特に限定するものではなく、天
然石膏、化学石膏等のいずれも用いることができるが、
燐鉱石と硫酸を用い、湿式燐酸製造法により燐酸を製造
する際に副生するα半水石膏を用いるのが好ましい。ま
た、該α半水石膏を乾燥後、無機アルカリを加えるα半
水石膏がより好適である。DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail.
The gypsum used in the present invention is not particularly limited, and any of natural gypsum and chemical gypsum can be used.
It is preferable to use gypsum of α-hemihydrate, which is a by-product when phosphoric acid is produced by a wet phosphoric acid production method using a phosphate rock and sulfuric acid. Further, α-hemihydrate gypsum to which an inorganic alkali is added after drying the α-hemihydrate gypsum is more preferable.
【０００７】セメントとしては、各種のポルトランドセ
メント、高炉セメント、フライアッシュセメント、シリ
カセメント等の混合セメントならびにアルミナセメント
などを用いることができる。石膏とセメントは、石膏７
０〜１００重量部とセメント３０〜０重量部の比率で用
いるのが好ましい。石膏７０重量部未満またはセメント
３０重量部を超えると硬化不足による強度の低下、乾
燥、収縮によるヒビ割れが発生するので好ましくない。
また、成形後の養生硬化に長時間を要し生産性が極めて
低い製造設備となり経済性に問題を生じる。As the cement, various cements such as Portland cement, blast furnace cement, fly ash cement, silica cement and alumina cement can be used. Gypsum and cement are plaster 7
It is preferable to use 0 to 100 parts by weight of cement and 30 to 0 parts by weight of cement. Less than 70 parts by weight of gypsum or more than 30 parts by weight of cement is not preferred because cracking due to insufficient curing, drying and shrinkage occurs due to insufficient curing.
In addition, it takes a long time for curing and curing after molding, resulting in a production facility with extremely low productivity, which causes a problem in economy.
【０００８】本発明で用いる無機質粉末には、例えばフ
ライアッシュ、シラスバルーン、パーライト、バーミキ
ュライト等の軽量骨材等が用いられる。これを用いると
上記繊維の凝集を低減化、ボードの軽量化が可能とな
る。これらは非水和性でα型半水石膏の水和を妨げるも
のではないと共に、石膏ボードの強度低下をきたさない
ものをいう。中でもシラスバルーンは、球状にして軽量
であると共に破壊強度が高いので、軽量・高強度ボード
に好適である。この無機質粉末の粉末度としては、２０
〜５００μｍ、好ましくは１００〜３００μｍの粉末度
のものを用いるのがよい。粉末度が２０μｍ未満では粉
砕費用がかさみ、収率が低下するので好ましくない。ま
た、５００μｍを超えると分散性が低下すると共に、繊
維の付着性及び凝集防止効果が低下し好ましくない。添
加する無機質粉末量は、石膏とセメントの合計１００重
量部に対し、１〜３０重量部であり、好ましくは３〜１
０部であり、さらに好ましくは、３〜７重量部である。
添加量が１重量部未満では、繊維の分散性が悪く、表面
性の劣悪、強度低下等の品質低下を招く原因となるので
好ましくない。また、３０重量部を越えると、スラリー
の流動性が極度に低下し成形不可能となるので好ましく
ない。As the inorganic powder used in the present invention, for example, lightweight aggregates such as fly ash, shirasu balloon, perlite, vermiculite and the like are used. When this is used, the aggregation of the fibers can be reduced, and the weight of the board can be reduced. These are non-hydratable, do not hinder the hydration of α-type hemihydrate gypsum, and mean those which do not cause a decrease in the strength of the gypsum board. Above all, a shirasu balloon is suitable for a lightweight and high-strength board because it is spherical and lightweight and has high breaking strength. The fineness of the inorganic powder is 20
It is preferable to use those having a fineness of from 500 to 500 μm, preferably from 100 to 300 μm. If the fineness is less than 20 μm, the pulverization cost increases and the yield decreases, which is not preferable. On the other hand, if it exceeds 500 μm, the dispersibility decreases, and the adhesion of fibers and the effect of preventing coagulation decrease. The amount of the inorganic powder to be added is 1 to 30 parts by weight, preferably 3 to 1 part by weight, based on 100 parts by weight of the total of gypsum and cement.
0 parts, more preferably 3 to 7 parts by weight.
If the addition amount is less than 1 part by weight, the dispersibility of the fiber is poor, and the quality of the fiber is deteriorated such as poor surface properties and reduced strength. On the other hand, if the amount exceeds 30 parts by weight, the fluidity of the slurry is extremely reduced and molding becomes impossible, which is not preferable.
【０００９】本発明で用いる繊維は、天然繊維、化学繊
維のいずれでもよく、例えば、故紙、麻、綿茎、ワラな
どを乾式粉砕してパルプ化した植物性繊維、トウヒ、モ
ミ、マツ、カラマツ、などからつくる針葉樹パルプ（Ｎ
Ｐ）、ポプラ、カバ、ブナ、ユーカリなどからつくる広
葉樹パルプ（ＰＬ）の植物繊維、ガラス繊維、ロックウ
ール等の無機繊維などである。好ましくは、針葉樹パル
プ、広葉樹パルプの植物繊維がよく、その形状として
は、直径２０〜１００μｍ、長さ５０〜７０００μｍ、
好ましくは１００〜６０００μｍのものを用いるのがよ
い。繊維を用いる目的は、ボードの施工性の向上及び軽
量化、耐衝撃強度の向上を図るものである。添加する繊
維量は、石膏とセメントの合計１００重量部に対し、
０．０５〜５重量部であり、好ましくは１〜２部であ
る。添加量が０．０５重量部未満では目的とする耐衝撃
強度の低下や、施工性、軽量化に対して効果が得られな
いので好ましくない。また、添加量が５重量部を越える
と、混練作業に支障を来たし、また、繊維のダマが発生
し、得られたスラリーの流動性が低く、型枠への流し込
み工程に特に大きな支障となり生産効率低下、および表
面性の劣悪、強度低下等の品質低下を招く原因となる。The fibers used in the present invention may be either natural fibers or synthetic fibers. For example, plant fibers, spruce, fir, pine, larch, which are obtained by dry-pulverizing waste paper, hemp, cotton stalk, straw, etc. , Pulp made of softwood (N
P), plant fibers of hardwood pulp (PL) made of poplar, hippopotamus, beech, eucalyptus and the like, and inorganic fibers such as glass fiber and rock wool. Preferably, plant fibers of softwood pulp and hardwood pulp are good, and the shape thereof is 20 to 100 μm in diameter, 50 to 7000 μm in length,
Preferably, a material having a thickness of 100 to 6000 μm is used. The purpose of using the fiber is to improve the workability of the board, reduce the weight, and improve the impact resistance. The amount of fiber to be added is based on a total of 100 parts by weight of gypsum and cement.
It is 0.05 to 5 parts by weight, preferably 1 to 2 parts. If the addition amount is less than 0.05 part by weight, it is not preferable because effects on the intended impact resistance reduction, workability and weight reduction cannot be obtained. On the other hand, if the added amount exceeds 5 parts by weight, the kneading operation is hindered, fibers are formed, the fluidity of the obtained slurry is low, and the step of pouring the slurry into the mold is particularly seriously hindered. This causes a reduction in efficiency, a deterioration in surface properties, and a reduction in quality such as a reduction in strength.
【００１０】本発明に用いる吸放湿性物質は、セピオラ
イト、アタパルジャイト、モンモリロナイト、ケイソウ
土、ゾノライト、シリカゲル及び活性白土等の中から選
択される１種類以上の粘土鉱物からなる無機系物質や、
ポバール、ＣＭＣ、ポリエチレンオキサイド、澱粉、ポ
リアクリル酸ソーダからなる水溶性高分子物質、熱硬化
性樹脂、熱可塑性樹脂、あるいは合成ゴム系樹脂を前記
水溶性高分子で変性させた吸水性高分子物質、天然繊
維、再生繊維、半合成繊維、および吸湿性合成繊維の中
から選択される１種類以上の有機質物質からなる有機系
の吸放湿性添加物等が使用される。The hygroscopic substance used in the present invention is an inorganic substance composed of one or more clay minerals selected from sepiolite, attapulgite, montmorillonite, diatomaceous earth, zonolite, silica gel, activated clay, and the like.
Poval, CMC, polyethylene oxide, starch, water-soluble polymer material composed of sodium polyacrylate, thermosetting resin, thermoplastic resin, or water-absorbing polymer material obtained by modifying a synthetic rubber-based resin with the water-soluble polymer For example, an organic moisture-absorbing / desorbing additive composed of at least one organic substance selected from natural fibers, regenerated fibers, semi-synthetic fibers, and hygroscopic synthetic fibers is used.
【００１１】吸放湿性物質は無機系の１種類又は２種類
以上、有機系の１種類又は２種類以上、無機系、有機系
の混合等いずれの使用方法でもよい。吸放湿性物質の添
加量は石膏とセメント１００重量部に対して０．５〜５
重量部であり、さらに好ましくは１〜３重量部が好適で
ある。添加方法は石膏とセメントに前もって混合してお
いてもよく、また、水との混合時に添加してもよい。添
加量が０．５重量部未満では、ボードに十分な吸放湿性
能が得られないので好ましくない。また、５重量部を越
えると石膏ボードの硬度が不十分になり好ましくない。The moisture-absorbing / desorbing substance may be used in any manner such as one or more inorganic substances, one or more organic substances, and a mixture of inorganic and organic substances. The amount of the hygroscopic substance added is 0.5 to 5 per 100 parts by weight of gypsum and cement.
Parts by weight, more preferably 1 to 3 parts by weight. The method of addition may be preliminarily mixed with gypsum and cement, or may be added when mixing with water. If the amount is less than 0.5 part by weight, sufficient moisture absorption / release performance of the board cannot be obtained, which is not preferable. If it exceeds 5 parts by weight, the hardness of the gypsum board becomes insufficient, which is not preferable.
【００１２】その他必要に応じ流動化剤を使用すること
が可能であり、その種類は特に限定するものではなく、
以下のようなものが使用できる。例えば、オキシカルボ
ン酸系及び／又はポリカルボン酸系は、セメントに良好
な流動性を付与し、その添加量は石膏とセメント１００
重量部に対して、０．０５〜５重量部が好ましく、更に
好ましくは、０．１〜２重量部が好適である。０．０５
重量部未満では、適切な水量において、フロー１００ｍ
ｍ以上の流動性の水溶性スラリーが得られず、型枠への
流し込み成形に於いて支障を来すので好ましくない。ま
た、５重量部を超えると、著しい凝結遅延を引き起し強
度発現に悪影響を与えるので好ましくない。その他、β
−ナフタレンスルホン酸ホルムアルデヒド高縮合物の
塩、メラミンスルホン酸ホルムアルデヒド縮合物の塩、
アミノスルホン酸縮合物の塩及びリグニン系流動化剤が
用いられる。この中より、特に好ましくは、流動性が大
きく、凝結遅延作用を有するオキシカルボン酸系及び／
又はポリカルボン酸系が好ましい。Other fluidizers can be used if necessary, and the type thereof is not particularly limited.
The following can be used: For example, an oxycarboxylic acid type and / or a polycarboxylic acid type imparts good fluidity to a cement, and the amount of addition thereof is gypsum and cement 100%.
The amount is preferably 0.05 to 5 parts by weight, more preferably 0.1 to 2 parts by weight with respect to parts by weight. 0.05
If the amount is less than 100 parts by weight, the flow rate is 100 m
m or more is not preferable since a water-soluble slurry having a flowability of m or more cannot be obtained, which causes trouble in casting into a mold. On the other hand, if it exceeds 5 parts by weight, remarkable setting retardation is caused, which adversely affects the development of strength. Other, β
A salt of a naphthalenesulfonic acid formaldehyde polycondensate, a salt of a melaminesulfonic acid formaldehyde condensate,
A salt of an aminosulfonic acid condensate and a lignin-based fluidizing agent are used. Of these, an oxycarboxylic acid-based compound having high fluidity and having a setting retarding effect is particularly preferable.
Or a polycarboxylic acid type is preferable.
【００１３】石膏とセメントと流動化剤の成分のみで
は、水硬性組成物に高流動性を付与することができて
も、流動性の経時低下が大きいので、型枠のすみずみま
で行きとどかないうちに流動性を失い、実用上不都合と
なる。そこで、本発明では、必要に応じて、高流動性の
経時低下を少なくするために、遅延剤として、ヒドロキ
シカルボン酸及び／又はその塩類（以下、ヒドロキシカ
ルボン酸類という）と、促進剤としてアルカリ金属酸塩
及び／又はアルカリ金属重炭酸塩（以下、アルカリ金属
炭酸塩等という）とをさらに併用配合する。[0013] With only the components of gypsum, cement and a fluidizing agent, even if high fluidity can be imparted to the hydraulic composition, the fluidity is greatly reduced with time, so it cannot reach every corner of the mold. The liquidity is lost at a later time, which is practically inconvenient. Therefore, in the present invention, if necessary, in order to reduce the deterioration with time of high fluidity, hydroxycarboxylic acid and / or salts thereof (hereinafter, referred to as hydroxycarboxylic acids) as a retarder, and alkali metal as a promoter Further, an acid salt and / or an alkali metal bicarbonate (hereinafter, referred to as an alkali metal carbonate or the like) is further used in combination.
【００１４】遅延剤としてのヒドロキシカルボン酸類の
添加量は、石膏とセメント１００重量部に対して、０．
０１〜５重量部、好ましくは０．０５〜３．０重量部が
好適である。添加量が０．０１重量部未満では実用的な
流動性低下防止効果が得られないので好ましくない。ま
た、５重量部を超えると極端に凝結時間が長くなり、ま
た、強度発現も悪くなるので好ましくない。The amount of hydroxycarboxylic acid added as a retarder is 0.1 to 100 parts by weight of gypsum and cement.
The suitable amount is from 01 to 5 parts by weight, preferably from 0.05 to 3.0 parts by weight. If the added amount is less than 0.01 part by weight, a practical effect of preventing a decrease in fluidity cannot be obtained, which is not preferable. On the other hand, if it exceeds 5 parts by weight, the setting time becomes extremely long, and the strength development becomes poor, which is not preferable.
【００１５】ヒドロキシカルボン酸類の例としては、リ
ンゴ酸、リンゴ酸ナトリウム、リンゴ酸カリウム、リン
ゴ酸リチウム、酒石酸、酒石酸ナトリウム、酒石酸カリ
ウム、酒石酸リチウム、クエン酸、クエン酸ナトリウ
ム、クエン酸スリウム、クエン酸リチウム等を挙げるこ
とができる。これらのうち、特に好ましいのは、クエン
酸及びその塩が好適である。Examples of hydroxycarboxylic acids include malic acid, sodium malate, potassium malate, lithium malate, tartaric acid, sodium tartrate, potassium tartrate, lithium tartrate, citric acid, sodium citrate, thulium citrate, citric acid Lithium and the like can be mentioned. Of these, citric acid and its salts are particularly preferred.
【００１６】また、促進剤としてのアルカリ金属炭酸塩
等の使用量は、石膏とセメント１００重量部に対して、
０．０１〜５重量部、好ましくは０．１〜３重量部が好
適である。０．０１重量部未満では硬化促進の効果が小
さく、また、５重量部を超えると硬化速度が速すぎ作業
性が悪くなり、又耐水性にも悪影響を与えるので好まし
くない。アルカリ金属炭酸塩等の役割は、前記流動性の
経時低下防止効果を助長すると共に、硬化しはじめてか
らの強度の立ち上りを大きくするものであって、前記以
外の使用量では、このような効果は十分でない。炭酸塩
や重炭酸塩のアルカリ金属としては、リチウム、ナトリ
ウム、カリウム等が挙げられる。The amount of the alkali metal carbonate or the like used as an accelerator is based on 100 parts by weight of gypsum and cement.
0.01 to 5 parts by weight, preferably 0.1 to 3 parts by weight is suitable. If the amount is less than 0.01 part by weight, the effect of accelerating the curing is small, and if it exceeds 5 parts by weight, the curing speed is too high, the workability is deteriorated, and the water resistance is also adversely affected. The role of the alkali metal carbonate or the like promotes the effect of preventing the fluidity from deteriorating with time and increases the rise in strength from the start of curing. not enough. Examples of the alkali metal of carbonate or bicarbonate include lithium, sodium, potassium and the like.
【００１７】湿式燐酸製造法より得られたα半水石膏に
添加するアルカリは、有機性、無機性いずれもアルカリ
性を示す物であれば特に限定するものではない。好まし
くは無機化合物であるＮａＯＨ、ＫＯＨ、Ｃａ（ＯＨ）
２等の水酸化物、ＣａＣＯ３、Ｋ２ＣＯ３等の炭酸塩及
び水溶液中で水酸化物を生成するＮａ２Ｏ、ＣａＯ、Ｍ
ｇＯ等の塩基性酸化物、アンモニアガス／溶液が挙げら
れ、二種類以上混合してもよい。添加量は、α半水石膏
１００重量部当たり、０．１〜５重量部であり、好まし
くは０．３〜０．５重量部である。当然のことながら、
無機アルカリとして、セメント等のアルカリ性を示す硬
化性無機物を添加、混合してもよい。The alkali to be added to the α-hemihydrate gypsum obtained by the wet phosphoric acid production method is not particularly limited as long as it shows both organic and inorganic alkalinity. NaOH, KOH, Ca (OH) which are preferably inorganic compounds
2 such as hydroxides, carbonates such as CaCO 3 and K 2 CO 3, and Na 2 O, CaO, and M that form hydroxides in an aqueous solution.
Examples include basic oxides such as gO, and ammonia gas / solution, and two or more kinds may be mixed. The amount of addition is 0.1-5 parts by weight, preferably 0.3-0.5 parts by weight, per 100 parts by weight of α-hemihydrate gypsum. As a matter of course,
As the inorganic alkali, a hardening inorganic material exhibiting alkalinity such as cement may be added and mixed.
【００１８】石膏とセメントと無機質粉末と繊維及び吸
放湿性物質に添加する水量は、石膏とセメント１００重
量部に対して２０〜１５０重量部である。水量は、混合
スラリーの流動性や、ボードの強度に大きく影響を及ぼ
す要因であり用いる石膏の種類や製造方法により異な
る。The amount of water to be added to gypsum, cement, inorganic powder, fiber and hygroscopic substance is 20 to 150 parts by weight based on 100 parts by weight of gypsum and cement. The amount of water is a factor that greatly affects the fluidity of the mixed slurry and the strength of the board, and varies depending on the type of gypsum used and the production method.
【００１９】例えば、α半水石膏を用い型枠へ流し込む
場合、石膏とセメント１００重量部に対し、水を５０〜
１００重量部とするのがよく、さらに好ましくは６０〜
８０重量部である。これは５０重量％未満であると型枠
への流し込みに適したスラリーの流動性が得られず、ま
た１００重量％を超えて添加すると、大きな強度低下を
招き、又養生硬化時間が大幅に長くなり、生産効率の極
度な低下を来す。For example, when α-hemihydrate gypsum is poured into a mold, 50 to 50 parts by weight of water is added to 100 parts by weight of gypsum and cement.
The amount is preferably 100 parts by weight, more preferably 60 to 100 parts by weight.
80 parts by weight. If the amount is less than 50% by weight, the fluidity of the slurry suitable for pouring into a mold cannot be obtained. If the amount exceeds 100% by weight, a large decrease in strength is caused, and the curing time is significantly long. And the production efficiency becomes extremely low.
【００２０】又、同様にα半水石膏を用いプレス成形す
る場合、石膏とセメント１００重量部に対し、水を２０
〜５０重量部とするのがよく、さらに好ましくは２５〜
４０重量部である。これは水が２０重量部未満である
と、α半水石膏の水和反応が完結しない状態であり、５
０重量部を越えるとスラリー状となり、その後のフォー
ミング、プレス成形の作業性が困難となる。当然のこと
ながら、大きな強度低下を招き、又養生硬化時間が大幅
に長くなり、生産効率の極度な低下を来す。β半水石膏
を用い型枠へ流し込む場合、石膏１００重量部に対し、
水を６０〜１５０重量部とするのがよく、さらに好まし
くは８０〜１２０重量部である。Similarly, when press-molding using α-hemihydrate gypsum, 20 parts of water is added to 100 parts by weight of gypsum and cement.
To 50 parts by weight, more preferably 25 to 50 parts by weight.
40 parts by weight. This is a state in which the hydration reaction of α-hemihydrate gypsum is not completed when the amount of water is less than 20 parts by weight.
If the amount exceeds 0 parts by weight, a slurry is formed, and the workability of subsequent forming and press molding becomes difficult. As a matter of course, the strength is greatly reduced, and the curing and curing time is significantly increased, resulting in an extremely low production efficiency. When pouring into a mold using β hemihydrate gypsum, for 100 parts by weight of gypsum,
The water content is preferably 60 to 150 parts by weight, more preferably 80 to 120 parts by weight.
【００２１】又、同様にβ半水石膏を用いプレス成形す
る場合、石膏１００重量部に対し、水を２０〜６０重量
部とするのがよく、さらに好ましくは２５〜５０重量部
である。Similarly, in the case of press molding using β-hemihydrate gypsum, water is preferably used in an amount of 20 to 60 parts by weight, more preferably 25 to 50 parts by weight, based on 100 parts by weight of gypsum.
【００２２】本発明の流し込みによる製造方法は、石膏
とセメントと無機質粉末と繊維及び吸放湿性物質に必要
に応じ流動化剤、遅延剤、促進剤を添加した混合物を水
と混合撹拌する。得られたスラリーを型枠へ流し込み、
凝結終了時間を目途に脱型する。ここで言う凝結時間と
は石膏の見掛けの硬化であり、測定方法はＪＩＳに準拠
する。脱型後の内装壁用石膏ボードを養生（室温〜４５
℃）、乾燥（７０℃〜９０℃）を行いボードを得る。養
生時間は１時間〜３時間、乾燥時間は２時間〜１０時間
とする。このようにして得られた内装壁用石膏ボード
は、繊維と無機質粉末との凝集物が発生せず、均質で表
面精度の良い、吸放湿性能を備えた優れた石膏ボードで
ある。According to the casting method of the present invention, a mixture of gypsum, cement, inorganic powder, fiber, and a moisture-absorbing / desorbing substance, if necessary, with a fluidizing agent, a retarder, and an accelerator is mixed and stirred with water. Pour the obtained slurry into the mold,
Demold at the end of setting time. The setting time referred to here is the apparent hardening of the gypsum, and the measuring method complies with JIS. Cure the gypsum board for the interior wall after demolding (room temperature to 45
° C) and drying (70 ° C to 90 ° C) to obtain a board. The curing time is 1 hour to 3 hours, and the drying time is 2 hours to 10 hours. The gypsum board for an interior wall obtained in this way is an excellent gypsum board having a uniform and good surface accuracy and having a moisture absorbing / releasing performance, without generating agglomerates of fibers and inorganic powder.
【００２３】本発明のフォーミングし次いでプレス成形
を特徴とする製造方法は、石膏とセメントと無機質粉末
と繊維及び吸放湿性物質に、必要に応じ流動化剤、遅延
剤、促進剤を添加した物に水を加えた混合物をフォーマ
ーに送り、計量しながらベルトコンベヤー上で高さ、幅
を定め、マット状にフォーミングする。フォーミングし
たものを直ぐにプレス機に送り加圧する。一定時間加圧
後、解圧しプレス機から取り出された内装壁用石膏ボー
ドを養生（室温）、乾燥（４０℃〜８０℃）を行いボー
ドを得る。養生時間は２時間〜５時間、乾燥時間は２時
間〜８時間とする。このようにして得られた内装壁用石
膏ボードは、繊維と無機質粉末との凝集物が発生せず、
均質で表面精度が良く、曲げ強度が高く、かつ吸放湿性
能を備えた優れた品質である。The production method of the present invention characterized by forming and then press molding is a method of adding gypsum, cement, inorganic powder, fiber and moisture-absorbing and / or moisture-absorbing substance, if necessary, with a fluidizing agent, a retarder and an accelerator. The mixture obtained by adding water to the mixture is fed to a former, and the height and width are determined on a belt conveyor while being measured, and the mixture is formed into a mat. The formed product is immediately sent to a press and pressed. After pressurizing for a certain period of time, the gypsum board for the interior wall taken out of the press machine is cured (room temperature) and dried (40 ° C to 80 ° C) to obtain a board. The curing time is 2 hours to 5 hours, and the drying time is 2 hours to 8 hours. The gypsum board for the interior wall thus obtained does not generate aggregates of the fibers and the inorganic powder,
It is a homogeneous material with good surface accuracy, high bending strength, and excellent moisture absorption / desorption performance.
【００２４】[0024]
【実施例】以下、本発明を実施例により更に詳細に説明
する。また、部は特記しないかぎり重量部を示す。 実施例１ 燐鉱石と硫酸を用いて、湿式燐酸製造により燐酸を製造
する際に副生するα半水石膏１００部にアルカリ（消石
灰）０．４部を添加したα半水石膏（以下、α半水石
膏）８０部と普通ポルトランドセメント２０部、無機質
粉末としてパーライト５部、繊維としてパルプ繊維１．
５部、吸放湿性物質としてシリカゲル２部、流動化剤と
してポリカルボン酸系（無水マレイン酸）を主成分とす
る竹本油脂（株）商品名「マリアリムＡＫＭ６０Ｆ」
０．５部、硬化促進剤として硫酸カリウム２部を均一混
合したものと、水７０部を約３分間撹拌混合した。得ら
れたスラリーを用いて型枠へ流し込み（金型）、２時間
後に型枠から外し、１時間養生（室温）の後、３時間乾
燥（４０℃〜８０℃）を行った。この様にして得られた
石膏ボードの物性評価を実施した。配合を表１に、物性
の評価結果を表２に示す。The present invention will be described in more detail with reference to the following examples. Parts are parts by weight unless otherwise specified. Example 1 α-hemihydrate gypsum (hereinafter referred to as α) in which 0.4 part of alkali (slaked lime) is added to 100 parts of α-hemihydrate gypsum by-produced when phosphoric acid is produced by wet phosphoric acid production using phosphate rock and sulfuric acid. 80 parts of hemihydrate gypsum), 20 parts of ordinary Portland cement, 5 parts of pearlite as an inorganic powder, and pulp fibers as fibers.
5 parts, 2 parts of silica gel as moisture-absorbing and desorbing substance, trade name "Mariarim AKM60F" made by Takemoto Yushi Co., Ltd. containing polycarboxylic acid (maleic anhydride) as a fluidizing agent as a main component.
0.5 part, 2 parts of potassium sulfate as a curing accelerator were uniformly mixed, and 70 parts of water were stirred and mixed for about 3 minutes. The obtained slurry was poured into a mold (die), removed from the mold 2 hours later, cured for 1 hour (room temperature), and then dried (40 ° C to 80 ° C) for 3 hours. Physical properties of the gypsum board thus obtained were evaluated. The composition is shown in Table 1, and the evaluation results of physical properties are shown in Table 2.
【００２５】なお、各物性の評価は次のように測定し
た。 （１）表面性：パルプ繊維のダマ状態、及びボード全面
の平滑性を目視にて判定した。 （２）吸放湿性：サンプルの裏面及び木口をマスクング
し、（イ）２０℃、５０％ＲＨの恒温恒湿器中にて７２
時間養生し、（ロ）５０℃、８０％ＲＨの恒温恒湿器中
へ移し、７２時間後のサンプル重量変化を測定し（吸湿
性）、その後ただちに（ハ）２０℃、５０％ＲＨの恒温
恒湿器中へ移し、７２時間後のサンプル重量変化を測定
する（放湿性）。この（ロ）、（ハ）の操作を１サイク
ルとし、３サイクル後の各（ロ）、（ハ）の表面積当た
りの重量変化を求めた（ｇ／ｍ２）。 （３）曲げ強度：ＪＩＳ Ｒ ９１１２に準拠して行っ
た。試験片（３０×４０×１ｃｍ）の供試体を、温度２
０℃、相対湿度６０％の部屋に１４日間養生し、曲げ強
度用試験器（丸菱科学機械製作所ＧＢＬ−５００）の支
持部（幅３５ｃｍ）に置き、供試体をの中心部に懸架部
を合わせ、懸架部を２５０Ｎ／ｍｉｎで加圧する。供試
体が割れた時の力を曲げ強度とする。 （４）耐衝撃性試験：ＪＩＳ Ａ １４２１（建築用ボ
ード）を参考とし、以下の条件にて実施し、くぼみの直
径の測定と裏面への亀裂の程度を目視にて判定した。 試験体サイズ：２５０×２５０×１３（ｍｍ） 試験体の支持方法：砂上全面支持 おもりの種類：鋼球 重量：５１０ｇ 直径：５０ｍｍ 落下高さ：５０ｃｍ 裏面の亀裂判定基準 ○：亀裂が全く無い状態 △：亀裂が僅かに認められる ×：亀裂が顕著に認められる （５）耐候性：ＪＩＳ Ａ １４１５に準拠 試験体サイズ：１５０×７５×１３（ｍｍ） 試験機：サンシャインスーパーライフウエザーメーター（ＷＥＬ− ＳＵＮ−ＨＣ型ガス試験器（株）製） 光源用カーボン：サンシャインカーボンアーク燈 周期時間：アーク燈→１２０分 降雨→１８分 試験時間：１００時間 耐候性判定基準 ○：表面の浸食（凸凹）が僅かに認められる △：表面の浸食（凸凹）が認められる ×：表面の浸食（凸凹）が顕著に認められるThe evaluation of each physical property was measured as follows. (1) Surface property: The lump state of the pulp fiber and the smoothness of the entire surface of the board were visually determined. (2) Moisture absorption / desorption property: The back surface of the sample and the kiguchi were masked, and (a) 72 ° C. in a thermostat at 20 ° C. and 50% RH.
After curing for 2 hours, the sample was transferred to a thermo-hygrostat at 50 ° C. and 80% RH, and the weight change of the sample after 72 hours was measured (hygroscopicity). The sample is transferred into a humidity chamber, and the change in sample weight after 72 hours is measured (humidity release). The operations of (b) and (c) were defined as one cycle, and the weight change per surface area of each of (b) and (c) after three cycles was obtained (g / m 2 ). (3) Flexural strength: Performed in accordance with JIS R 9112. A test piece (30 × 40 × 1 cm) was heated at a temperature of 2
Cured in a room at 0 ° C. and a relative humidity of 60% for 14 days, placed on a support (35 cm in width) of a bending strength tester (Marubishi Scientific Machinery Co., Ltd. GBL-500), and set a suspension at the center of the specimen. Then, the suspension is pressurized at 250 N / min. The force at which the specimen cracks is defined as the bending strength. (4) Impact resistance test: The test was carried out under the following conditions with reference to JIS A 1421 (building board), and the diameter of the dent was measured and the degree of cracks on the back surface was visually judged. Specimen size: 250 x 250 x 13 (mm) Method of supporting the specimen: whole surface support on sand Type of weight: steel ball Weight: 510 g Diameter: 50 mm Drop height: 50 cm Criterion for determining cracks on the back surface ○: No cracks at all Δ: Cracks are slightly recognized X: Cracks are significantly recognized (5) Weather resistance: JIS A 1415 Specimen size: 150 × 75 × 13 (mm) Testing machine: Sunshine Super Life Weather Meter (WEL-) (SUN-HC type gas tester Co., Ltd.) Carbon for light source: Sunshine carbon arc lamp Cycle time: arc lamp → 120 minutes Rainfall → 18 minutes Test time: 100 hours Weather resistance judgment criteria ○: Surface erosion (unevenness) Slightly observed Δ: Surface erosion (unevenness) is observed ×: Surface erosion (unevenness) is significantly observed
【００２６】実施例２ 無機質粉末としてパーライト５部を１０部に変更した以
外は実施例１と同様に行った。配合を表１に、物性の評
価結果を表２に示す。Example 2 The same procedure as in Example 1 was carried out except that 5 parts of pearlite was changed to 10 parts as the inorganic powder. The composition is shown in Table 1, and the evaluation results of physical properties are shown in Table 2.
【００２７】実施例３ パルプ繊維１．５部を２．５部に変更した以外は実施例
１と同様に行った。配合を表１に、物性の評価結果を表
２に示す。Example 3 The procedure of Example 1 was repeated, except that the pulp fiber was changed from 1.5 parts to 2.5 parts. The composition is shown in Table 1, and the evaluation results of physical properties are shown in Table 2.
【００２８】実施例４ 吸放湿性物質としてシリカゲル２部を３部に変更した以
外は、実施例１と同様に行った。配合を表１に、物性の
評価結果を表２に示す。Example 4 The procedure of Example 1 was repeated, except that 2 parts of silica gel was changed to 3 parts as a moisture absorbing / releasing substance. The composition is shown in Table 1, and the evaluation results of physical properties are shown in Table 2.
【００２９】実施例５ α半水石膏８０部を７５部に、セメント２０部を２５部
に変更した以外は、実施例１と同様に行った。配合を表
１に、物性の評価を表２に示す。Example 5 The procedure of Example 1 was repeated, except that 80 parts of α-hemihydrate gypsum was changed to 75 parts and 20 parts of cement was changed to 25 parts. The composition is shown in Table 1, and the evaluation of physical properties is shown in Table 2.
【００３０】実施例６ α半水石膏８０部をβ半水石膏８０部に、促進剤２部を
０部に変更し、遅延剤としてクエン酸ナトリウム３部を
加えた以外は実施例１と同様に行った。配合を表１に、
物性の評価を表２に示す。Example 6 Same as Example 1 except that 80 parts of α-hemihydrate gypsum was changed to 80 parts of β-hemihydrate gypsum, 2 parts of accelerator were changed to 0 parts, and 3 parts of sodium citrate was added as a retarder. I went to. The composition is shown in Table 1.
Table 2 shows the evaluation of the physical properties.
【００３１】実施例７ 水７０部を３５部に、促進剤２部を１部に変更し、遅延
剤としてクエン酸ナトリウム３部を加えた以外は実施例
１と同様の配合とし、製造方法を型枠流し込みを、フォ
ーミングし次いでプレス成形とする製造方法に変更し
た。即ち、予め準備したフォーミング用箱内部へ、前記
配合の混合物を計量し、手でフォーミングしマット状と
し、直ぐにプレス機にて圧力３０ｋｇ／ｃｍ２で、３０
分間加圧し、解圧しプレス機から取り出されたボードを
２時間養生（室温），乾燥（４０℃〜８０℃）を１時間
行い内装壁用石膏ボードを得た。配合を表１に、物性の
評価を表２に示す。Example 7 The same formulation as in Example 1 was used except that 70 parts of water was changed to 35 parts, 2 parts of the accelerator was changed to 1 part, and 3 parts of sodium citrate was added as a retarder. The casting method was changed to a manufacturing method of forming and then press forming. That is, the mixture of the above-mentioned composition was weighed into a previously prepared forming box, formed into a mat shape by hand, and immediately pressed with a press machine at a pressure of 30 kg / cm 2 for 30 minutes.
After pressurizing for 1 minute, the board taken out of the press was cured (room temperature) for 2 hours and dried (40 ° C. to 80 ° C.) for 1 hour to obtain a gypsum board for interior wall. The composition is shown in Table 1, and the evaluation of physical properties is shown in Table 2.
【００３２】[0032]
【表１】 [Table 1]
【００３３】[0033]
【表２】 [Table 2]
【００３４】比較例１ 実施例１のα半水石膏８０部を１００部に変更し、普通
ポルトランドセメント２０部を０部に変更した以外は実
施例１と同様に行った。配合を表３に、物性の評価を表
４に示す。Comparative Example 1 The procedure of Example 1 was repeated except that the amount of α-hemihydrate gypsum was changed to 100 parts and the amount of ordinary Portland cement was changed to 0 parts. The formulation is shown in Table 3 and the evaluation of physical properties is shown in Table 4.
【００３５】比較例２ 実施例１のα半水石膏８０部を０部に変更し、普通ポル
トランドセメント２０部を１００部に変更した以外はた
以外は実施例１と同様に行った。配合を表３に、物性の
評価を表４に示す。Comparative Example 2 The procedure of Example 1 was repeated, except that the α-hemihydrate gypsum of Example 1 was changed to 0 parts and the ordinary Portland cement was changed to 20 parts to 100 parts. The formulation is shown in Table 3 and the evaluation of physical properties is shown in Table 4.
【００３６】実施例１の無機質粉末５部を０部に変更し
た以外は、実施例１と同様に行った。配合を表３に、物
性の評価を表４に示す。The procedure was the same as in Example 1, except that 5 parts of the inorganic powder of Example 1 was changed to 0 part. The formulation is shown in Table 3 and the evaluation of physical properties is shown in Table 4.
【００３７】比較例４ 実施例１の繊維１．５部を０部に変更した以外は実施例
１と同様に行った。配合を表３に、物性の評価を表４に
示す。Comparative Example 4 The procedure of Example 1 was repeated, except that 1.5 parts of the fiber of Example 1 was changed to 0 part. The formulation is shown in Table 3 and the evaluation of physical properties is shown in Table 4.
【００３８】比較例５ 実施例１の吸放湿性物質２部を０部に変更した以外は実
施例１と同様に行った。配合を表３に、物性の評価を表
４に示す。Comparative Example 5 The procedure of Example 1 was repeated except that the amount of the hygroscopic substance was changed from 2 parts to 0 part. The formulation is shown in Table 3 and the evaluation of physical properties is shown in Table 4.
【００３９】比較例６ 実施例１のα半水石膏８０部を、β半水石膏１００部
に、セメント２０部を０部に、促進剤２部を０部に、遅
延剤０部を３部に、水７０部を１１０部に変更した以外
は実施例１と同様に行った。配合を表３に、物性の評価
を表４に示す。Comparative Example 6 80 parts of α-hemihydrate gypsum of Example 1, 100 parts of β-hemihydrate gypsum, 20 parts of cement, 0 parts, 2 parts of accelerator, 0 parts, and 3 parts of retarder, 0 parts In the same manner as in Example 1, except that 70 parts of water was changed to 110 parts. The formulation is shown in Table 3 and the evaluation of physical properties is shown in Table 4.
【００４０】比較例７ 実施例７のα半水石膏８０部を１００部に、セメント２
０部を０部に変更した以外は実施例７と同様に行った。
配合を表３に、物性の評価を表４に示す。Comparative Example 7 80 parts of the α-hemihydrate gypsum of Example 7 was added to 100 parts of cement 2
Example 7 was carried out in the same manner as in Example 7, except that 0 part was changed to 0 part.
The formulation is shown in Table 3 and the evaluation of physical properties is shown in Table 4.
【００４１】[0041]
【表３】 [Table 3]
【００４２】[0042]
【表４】 [Table 4]
【００４３】[0043]
【発明の効果】本発明は、石膏とセメントと無機質粉末
と繊維及び吸放湿性物質を用いることにより、成型体中
にパルプ同志の凝集、形成されたダマと称される凝集物
が混在することなく、原材料の分布が均一であるため石
膏ボードの曲げ強さが低下することなく、表面精度のよ
い石膏ボードが得られる。この結果、吸放湿性能を具備
し、快適空間をもたらす内装壁用石膏ボードが得られる
のである。According to the present invention, the use of gypsum, cement, inorganic powder, fibers, and a moisture-absorbing / absorbing substance makes it possible for coagulation of pulp and coagulation called lumps to coexist in a molded product. In addition, since the distribution of raw materials is uniform, the gypsum board with good surface accuracy can be obtained without lowering the bending strength of the gypsum board. As a result, a gypsum board for an interior wall having moisture absorption / release performance and providing a comfortable space can be obtained.
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.6 識別記号 ＦＩ Ｃ０４Ｂ 111:40 (72)発明者 前田 晃一 山口県下関市彦島迫町七丁目１番１号 三 井東圧化学株式会社内──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. 6 Identification code FI C04B 111: 40 (72) Inventor Koichi Maeda 7-1-1, Hikoshimasako-cho, Shimonoseki-shi, Yamaguchi Pref.
Claims (10)
び吸放湿性物質からなる内装壁用石膏ボード。1. A gypsum board for an interior wall comprising gypsum, cement, an inorganic powder, fibers and a moisture absorbing / releasing substance.
酸製造により燐酸を製造する際に副生するα半水石膏で
ある請求項１記載の石膏ボード。2. The gypsum board according to claim 1, wherein the gypsum is α-hemihydrate gypsum by-produced when phosphoric acid is produced by wet phosphoric acid production using phosphate rock and sulfuric acid.
酸製造により燐酸を製造する際に副生するα半水石膏１
００重量部当たり、アルカリを０．１〜５重量部添加し
たα半水石膏である請求項１記載の石膏ボード。3. Gypsum is α-hemihydrate gypsum by-produced when phosphoric acid is produced by wet phosphoric acid production using phosphate rock and sulfuric acid.
2. The gypsum board according to claim 1, wherein the gypsum board is alpha hemihydrate gypsum to which 0.1 to 5 parts by weight of alkali is added per 100 parts by weight.
の石膏ボード。4. The gypsum board according to claim 1, wherein the gypsum is β-hemihydrate gypsum.
０〜０重量部よりなる請求項１記載の石膏ボード。5. Cement 3 with 70-100 parts by weight of gypsum
The gypsum board according to claim 1, comprising 0 to 0 parts by weight.
て、無機質粉末１〜３０重量部を用いる請求項１記載の
石膏ボード。6. The gypsum board according to claim 1, wherein 1 to 30 parts by weight of the inorganic powder is used based on 100 parts by weight of the gypsum and the cement.
て、繊維０．０５〜５重量部を用いる請求項１記載の石
膏ボード。7. The gypsum board according to claim 1, wherein the fiber is used in an amount of 0.05 to 5 parts by weight based on 100 parts by weight of gypsum and cement.
て、吸放湿性物質０．５〜５重量部を用いる請求項１記
載の石膏ボード。8. The gypsum board according to claim 1, wherein 0.5 to 5 parts by weight of the hygroscopic substance is used for 100 parts by weight of gypsum and cement.
び吸放湿性物質に水を加えて混合し、型枠へ流し込み、
養生硬化させることを特徴とする内装壁用石膏ボードの
製造方法。9. Water is added to gypsum, cement, inorganic powder, fiber and hygroscopic substance, mixed and poured into a mold.
A method for producing a gypsum board for an interior wall, comprising curing and curing.
び吸放湿性物質に水を加えて混合し、フォーミングし、
次いでプレス成形及び養生硬化させることを特徴とする
内装壁用石膏ボードの製造方法。10. Gypsum, cement, inorganic powder, fiber and hygroscopic substance are mixed by adding water, forming,
A method for producing a gypsum board for an interior wall, which is followed by press molding and curing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16427297A JPH1112019A (en) | 1997-06-20 | 1997-06-20 | Gypsum board for interior wall and its production |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16427297A JPH1112019A (en) | 1997-06-20 | 1997-06-20 | Gypsum board for interior wall and its production |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH1112019A true JPH1112019A (en) | 1999-01-19 |
Family
ID=15789941
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP16427297A Pending JPH1112019A (en) | 1997-06-20 | 1997-06-20 | Gypsum board for interior wall and its production |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH1112019A (en) |
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| JP2001114551A (en) * | 1999-08-10 | 2001-04-24 | Usg Corp | Gypsum/cement composition for building material |
| JP2002097058A (en) * | 2000-09-19 | 2002-04-02 | Nitto Boseki Co Ltd | Method for recycling construction waste material including gypsum board |
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| JP2002145655A (en) * | 2000-11-07 | 2002-05-22 | Yoshino Gypsum Co Ltd | Gypsum building material |
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1997
- 1997-06-20 JP JP16427297A patent/JPH1112019A/en active Pending
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|---|---|---|---|---|
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| KR20020034585A (en) * | 2000-11-02 | 2002-05-09 | 한종희 | a cement additive composition and a preparing method thereof |
| JP2002145655A (en) * | 2000-11-07 | 2002-05-22 | Yoshino Gypsum Co Ltd | Gypsum building material |
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| JP4651978B2 (en) * | 2004-06-25 | 2011-03-16 | 吉野石膏株式会社 | Recycling method of composite waste of gypsum board and rock wool sound absorbing board and gypsum board containing rock wool |
| JP2006008448A (en) * | 2004-06-25 | 2006-01-12 | Yoshino Gypsum Co Ltd | Method for recycling mixed waste of gypsum board with rock wool sound absorbing board and gypsum containing rock wool |
| KR100643315B1 (en) | 2004-12-16 | 2006-11-10 | 박재욱 | the manufacturing method and sandwich panel using the composition, composition of gypsum board |
| KR100656983B1 (en) | 2005-01-24 | 2006-12-20 | 요업기술원 | Method of inorganic complex panel and composition of inorganic core layer thereof |
| KR100798124B1 (en) | 2007-08-09 | 2008-01-28 | 김영식 | Noncombustible panel for construction |
| JP2012153560A (en) * | 2011-01-26 | 2012-08-16 | Denki Kagaku Kogyo Kk | Composition for building material and method of manufacturing carbonated building material |
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