JP3284756B2 - Water repellent gypsum board - Google Patents
Water repellent gypsum boardInfo
- Publication number
- JP3284756B2 JP3284756B2 JP12265594A JP12265594A JP3284756B2 JP 3284756 B2 JP3284756 B2 JP 3284756B2 JP 12265594 A JP12265594 A JP 12265594A JP 12265594 A JP12265594 A JP 12265594A JP 3284756 B2 JP3284756 B2 JP 3284756B2
- Authority
- JP
- Japan
- Prior art keywords
- gypsum
- water
- gypsum board
- weight
- parts
- 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
-
- 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
- C04B2111/20—Resistance against chemical, physical or biological attack
- C04B2111/27—Water resistance, i.e. waterproof or water-repellent materials
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】本発明は従来にない優れた性能を
有する撥水性石膏ボードに関する。更に詳しくは、耐水
性及び防火性の改善された撥水性石膏ボードに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water-repellent gypsum board having unprecedented superior performance. More specifically, it relates to a water-repellent gypsum board with improved water resistance and fire resistance.
【０００２】[0002]
【従来の技術】石膏を用いる石膏ボード製品は、石膏の
有する特性により、防火性、防音性、強度、廉価等の著
しい特徴にもかかわらず耐水性に問題があり使用範囲が
限定されているのが現状である。このような石膏の欠点
を補うために石膏にジメチルポリシロキサンを添加して
撥水性を向上させる方法（米国特許第３４５５７１９
号）や石膏にアルカリ金属のアルキルシリコネートと消
石灰または生石灰とを配合する方法（特開昭５６−５４
２６３号公報）等が提案されているが、これらの方法で
は、十分な撥水性が得られなかったり、撥水性を満足さ
せると含有有機物が増加するため防火性が損なわれる欠
点があった。また、撥水性が良くてもボード原紙と石膏
の接着が悪く石膏ボードに製造できないという欠点もあ
った。2. Description of the Related Art Gypsum board products using gypsum have problems in water resistance despite their remarkable features such as fireproofing, soundproofing, strength, and low cost due to the properties of gypsum, and the range of use is limited. Is the current situation. In order to compensate for such a disadvantage of gypsum, a method of adding dimethylpolysiloxane to gypsum to improve water repellency (US Pat. No. 3,455,719)
(Japanese Patent Application Laid-open No. 56-54), in which an alkali metal alkylsiliconate and slaked lime or quick lime are mixed with gypsum.
No. 263) has been proposed, but these methods have the drawback that sufficient water repellency cannot be obtained, or that if the water repellency is satisfied, the contained organic matter increases, resulting in impaired fire resistance. Further, there is a disadvantage that even if the water repellency is good, the adhesion between the board base paper and the gypsum is poor and the gypsum board cannot be manufactured.
【０００３】[0003]
【発明が解決しようとする課題】本発明は石膏の持つ防
火性を損なわず、かつ十分な撥水性を有する石膏ボード
を提供することを目的とするものである。SUMMARY OF THE INVENTION An object of the present invention is to provide a gypsum board which does not impair the fire resistance of gypsum and has sufficient water repellency.
【０００４】[0004]
【課題を解決するための手段】本発明者らはかかる問題
点の解消法につき鋭意検討を行ったところ、メチルハイ
ドロジェンポリシロキサンと特定の化合物を併用するこ
とにより、メチルハイドロジェンポリシロキサンの使用
量が少量でも撥水性を示し、防火性も損なわれず、ボー
ド原紙との接着も良好であることを見いだし本発明に至
った。Means for Solving the Problems The inventors of the present invention have conducted intensive studies on a method for solving such a problem, and found that the use of methyl hydrogen polysiloxane by using methyl hydrogen polysiloxane in combination with a specific compound. It has been found that even a small amount shows water repellency, the fire resistance is not impaired, and the adhesion to the board base paper is good, leading to the present invention.
【０００５】すなわち、本発明の要旨はメチルハイドロ
ジェンポリシロキサンと、セメント、珪酸カルシウム水
和物、酸化マグネシウム及び水酸化マグネシウムから選
ばれる少なくとも１種と石膏とを含む石膏組成物及びボ
−ド原紙からなることを特徴とする撥水性石膏ボ−ドに
存する。以下、本発明を詳細に説明する。That is, the gist of the present invention is to provide a gypsum composition and board base paper containing gypsum and methylhydrogenpolysiloxane, at least one selected from cement, calcium silicate hydrate, magnesium oxide and magnesium hydroxide. And a water-repellent gypsum board characterized by comprising: Hereinafter, the present invention will be described in detail.
【０００６】本発明に使用されるポリシロキサンは下記
の構造式を有するメチルハイドロジェンポリシロキサン
である。The polysiloxane used in the present invention is a methyl hydrogen polysiloxane having the following structural formula.
【０００７】[0007]
【化１】 Embedded image
【０００８】メチルハイドロジェンポリシロキサンの含
有量は、石膏１００重量部（半水石膏換算）に対して
０．２〜５重量部、好ましくは０．２〜１重量部であ
る。０．２重量部より少ないと十分な撥水性が得られな
い。５重量部より多いと防火性の点で不利になる。上記
一般式中、ｎは１〜１００の数を示す。[0008] The content of methylhydrogenpolysiloxane is 0.2 to 5 parts by weight, preferably 0.2 to 1 part by weight, based on 100 parts by weight of gypsum (in terms of gypsum hemihydrate). If the amount is less than 0.2 parts by weight, sufficient water repellency cannot be obtained. More than 5 parts by weight is disadvantageous in terms of fire protection. In the above general formula, n represents a number of 1 to 100.
【０００９】メチルハイドロジェンポリシロキサンはそ
のまま使用しても、また、メチルハイドロジェンポリシ
ロキサンを水中に乳化してなるエマルションとして使用
してもよい。エマルションとして使用すると石膏スラリ
ー中にメチルハイドロジェンポリシロキサンを均一に添
加混合できるので好ましい。メチルハイドロジェンポリ
シロキサンを水中に乳化してなるエマルションとするた
めに使用する乳化剤には特に制限はなく、例えば、ノニ
オン性乳化剤、アニオン性乳化剤、ポリビニルアルコー
ル等が挙げられる。[0009] Methyl hydrogen polysiloxane may be used as it is, or may be used as an emulsion obtained by emulsifying methyl hydrogen polysiloxane in water. Use as an emulsion is preferred because methylhydrogenpolysiloxane can be uniformly added and mixed into the gypsum slurry. The emulsifier used for emulsifying methylhydrogenpolysiloxane in water to form an emulsion is not particularly limited, and examples thereof include a nonionic emulsifier, an anionic emulsifier, and polyvinyl alcohol.
【００１０】ノニオン性乳化剤としてはグリセロールモ
ノステアレート、グリセロールモノオレエート、ソルビ
タンモノパルミテート、ソルビタンモノステアレート、
ソルビタントリステアレート、ソルビタンモノオレエー
ト、ソルビタントリオレエート、ポリオキシエチレンソ
ルビタンモノラウレート、ポリオキシエチレンソルビタ
ンモノパルミテート、ポリオキシエチレンソルビタンモ
ノステアレート、ポリオキシエチレンソルビタントリス
テアレート、ポリオキシエチレンソルビタンモノオレエ
ート、ポリオキシエチレンソルビタントリオレエート、
ポリオキシエチレンラウリルエーテル、ポリオキシエチ
レンセチルエーテルポリオキシエチレンステアリルエー
テル、ポリオキシエチレン高級アルコールエーテル、ポ
リオキシエチレンオクチルフエニルエーテル、ポリオキ
シエチレンノニルフエニルエーテルなどが挙げられる。As nonionic emulsifiers, glycerol monostearate, glycerol monooleate, sorbitan monopalmitate, sorbitan monostearate,
Sorbitan tristearate, sorbitan monooleate, sorbitan trioleate, polyoxyethylene sorbitan monolaurate, polyoxyethylene sorbitan monopalmitate, polyoxyethylene sorbitan monostearate, polyoxyethylene sorbitan tristearate, polyoxyethylene sorbitan Monooleate, polyoxyethylene sorbitan trioleate,
Examples include polyoxyethylene lauryl ether, polyoxyethylene cetyl ether, polyoxyethylene stearyl ether, polyoxyethylene higher alcohol ether, polyoxyethylene octyl phenyl ether, and polyoxyethylene nonyl phenyl ether.
【００１１】アニオン性乳化剤としては、ラウリル硫酸
ナトリウム、ドデシルベンゼンスルフォン酸ナトリウ
ム、アルキルナフタレンスルフォン酸ナトリウム、ジア
ルキルスルホコハク酸ナトリウム、混合脂肪酸ソーダ石
鹸、ステアリン酸ソーダ石鹸、オレイン酸カリ石鹸、高
級アルコール硫酸ナトリウム、β−ナフタレンスルフォ
ン酸ホルマリン縮合物のナトリウム塩などが挙げられ
る。Examples of the anionic emulsifier include sodium lauryl sulfate, sodium dodecylbenzenesulfonate, sodium alkylnaphthalene sulfonate, sodium dialkylsulfosuccinate, mixed fatty acid soda soap, sodium stearate soap, potassium oleate soap, higher alcohol sodium sulfate, and sodium salts of β-naphthalenesulfonic acid formalin condensate.
【００１２】ポリビニルアルコールとしては、ケン化度
７５モル％以上のポリビニルアルコールが好ましく、特
に、７６〜９０モル％のポリビニルアルコールが好まし
い。また、これらのポリビニルアルコールは２０℃にお
ける４％水溶液粘度が、通常１〜８０センチポイズ、特
に３〜５０センチポイズのものが好ましい。これらの乳
化剤の使用量はメチルハイドロジェンポリシロキサンに
対し通常、０．５〜１０重量％、好ましくは０．７〜５
重量％である。０．５重量％より少ないと安定なエマル
ションが得られず機械的安定性も悪くなり、１０重量％
より多いと十分な撥水性が得られない。As the polyvinyl alcohol, a polyvinyl alcohol having a saponification degree of 75 mol% or more is preferable, and a polyvinyl alcohol having a saponification degree of 76 to 90 mol% is particularly preferable. Further, these polyvinyl alcohols preferably have a 4% aqueous solution viscosity at 20 ° C. of usually 1 to 80 centipoise, particularly preferably 3 to 50 centipoise. These emulsifiers are used in an amount of usually 0.5 to 10% by weight, preferably 0.7 to 5% by weight, based on methyl hydrogen polysiloxane.
% By weight. If the amount is less than 0.5% by weight, a stable emulsion cannot be obtained, and the mechanical stability becomes poor.
If it is larger, sufficient water repellency cannot be obtained.
【００１３】セメント、珪酸カルシウム水和物、酸化マ
グネシウム、及び水酸化マグネシウムの添加量は石膏１
００重量部（半水石膏換算）に対して０．１重量部以
上、好ましくは０．２〜１重量部である。０．１重量部
より少ないと十分な撥水性が得られない。多量にいれて
も性能上問題はないがセメントを多量にいれると石膏の
凝結が早くなり作業性に問題がある。The amount of cement, calcium silicate hydrate, magnesium oxide, and magnesium hydroxide added is gypsum 1
It is 0.1 part by weight or more, preferably 0.2 to 1 part by weight, based on 00 parts by weight (in terms of hemihydrate gypsum). If the amount is less than 0.1 part by weight, sufficient water repellency cannot be obtained. There is no problem in performance even if it is added in a large amount, but if the cement is added in a large amount, the setting of the gypsum becomes faster and there is a problem in workability.
【００１４】セメント、珪酸カルシウム水和物、酸化マ
グネシウム及び水酸化マグネシウムは単独で使用しても
よいし、２種以上を混合して使用してもよい。セメント
としては普通ポルトランドセメント、早強ポルトランド
セメント、アルミナセメント、低アルカリセメントなど
が使用できる。珪酸カルシウム水和物としては例えばト
バモライトやゾノトライトなどの粉末が使用できる。珪
酸カルシウム化合物であってもワラストナイトのような
水和物でないものは効果はない。The cement, calcium silicate hydrate, magnesium oxide and magnesium hydroxide may be used alone or as a mixture of two or more. As the cement, ordinary Portland cement, early-strength Portland cement, alumina cement, low alkali cement and the like can be used. As calcium silicate hydrate, for example, powders such as tobermorite and zonotolite can be used. Even calcium silicate compounds which are not hydrates such as wollastonite have no effect.
【００１５】撥水性はメチルハイドロジェンポリシロキ
サンとセメント、珪酸カルシウム水和物、酸化マグネシ
ウムあるいは水酸化マグネシウムを併用することにより
始めて発現する。石膏の撥水性はセメントなどの代わり
に消石灰などを使用しても発現するが、消石灰を使用し
た場合、石膏とボード原紙との接着性が悪く石膏ボード
にはなりえない。The water repellency is developed only when methyl hydrogen polysiloxane is used in combination with cement, calcium silicate hydrate, magnesium oxide or magnesium hydroxide. Although the water repellency of gypsum is manifested by using slaked lime or the like instead of cement or the like, when slaked lime is used, the adhesion between the gypsum and the board base paper is poor and the gypsum board cannot be formed.
【００１６】石膏としては工業用に多用されるβ−半水
石膏、α−半水石膏および２型無水石膏のいずれも使用
できる。メチルハイドロジェンポリシロキサンと、セメ
ント、珪酸カルシウム水和物、酸化マグネシウム及び水
酸化マグネシウムから選ばれる少なくとも１種と石膏と
を含む石膏組成物は、必要に応じ、パーライト、バーミ
ュキライト等の軽量骨材、各種発泡剤、石膏用減水剤、
石膏凝結速度調節剤、補強繊維等を併用しても良い。As gypsum, any of β-hemihydrate gypsum, α-hemihydrate gypsum and type 2 anhydrous gypsum which are frequently used in industry can be used. A gypsum composition containing methyl hydrogen polysiloxane, gypsum and at least one selected from cement, calcium silicate hydrate, magnesium oxide and magnesium hydroxide, if necessary, can be used as a lightweight material such as perlite or vermiculite. Aggregates, various foaming agents, gypsum water reducing agents,
A gypsum setting speed regulator, reinforcing fibers and the like may be used in combination.
【００１７】本発明の石膏ボードを製造するには、所定
量の石膏、メチロハイドロジェンポリシロキサン、セメ
ント、珪酸カルシウム水和物、酸化マグネシウム、及び
水酸化マグネシウムから選ばれる少なくとも１種とおよ
び水を混合してスラリーとするか、あるいは、石膏の水
スラリー中にメチルハイドロジェンポリシロキサンとセ
メント、珪酸カルシウム水和物、酸化マグネシウム及び
水酸化マグネシウムから選ばれる少なくとも１種とを任
意の順序で添加し混合してスラリーとし、該スラリーを
常法に従ってボード原紙間に流し込むことにより、石膏
組成物とボード原紙間に接着剤を用いることなく成形
し、硬化後必要に応じて乾燥する。To produce the gypsum board of the present invention, a predetermined amount of gypsum, methylohydrogenpolysiloxane, cement, calcium silicate hydrate, magnesium oxide and magnesium hydroxide, and water To a slurry, or methylhydrogenpolysiloxane and at least one selected from cement, calcium silicate hydrate, magnesium oxide and magnesium hydroxide are added in an arbitrary order to a gypsum water slurry. Then, the mixture is mixed to form a slurry, and the slurry is poured into a board base paper in a conventional manner to form the gypsum composition between the gypsum composition and the board base paper without using an adhesive, and after curing, dried if necessary.
【００１８】[0018]
【実施例】次に本発明を実施例、比較例により説明す
る。なお、以下の例において「部」及び「％」はそれぞ
れ「重量部」及び「重量％」を意味する。 実施例１ メチルハイドロジェンポリシロキサン（信越化学製ＫＦ
−９９）９９部、ケン化度８５％のポリビニルアルコー
ル（日本合成製ＧＬ−０５）１部と水１３５部をホモミ
キサーにて乳化しメチルハイドロジェンポリシロキサン
を４２％含むエマルションを得た。Next, the present invention will be described with reference to examples and comparative examples. In the following examples, “parts” and “%” mean “parts by weight” and “% by weight”, respectively. Example 1 Methyl hydrogen polysiloxane (KF manufactured by Shin-Etsu Chemical Co., Ltd.)
-99) 99 parts, 1 part of polyvinyl alcohol (GL-05, manufactured by Nippon Gohsei) having a saponification degree of 85% and 135 parts of water were emulsified by a homomixer to obtain an emulsion containing 42% of methyl hydrogen polysiloxane.
【００１９】β半水石膏（吉野石膏製桜印Ａ級）１００
部に上記のメチルハイドロジェンポリシロキサンのエマ
ルションをメチルハイドロジェンポリシロキサンとして
０．６部、セメント１部及び水８０部を添加しスラリー
とし、これを石膏ボード原紙の間に流し込み石膏ボード
とし、７０℃で２．５時間乾燥した。乾燥後の石膏と石
膏ボード原紙の接着は十分であり剥離は認められなかっ
た。得られた石膏ボードの比重は０．８６であった。該
ボードを２０℃±１℃の水中に２時間、２４時間浸漬後
の吸水率（Ａｗ2 、Ａｗ24）を測定した。Β hemihydrate gypsum (Yoshino Gypsum Sakura-in Class A) 100
To 0.6 part of the above emulsion of methyl hydrogen polysiloxane as methyl hydrogen polysiloxane, 1 part of cement and 80 parts of water were added to form a slurry, which was poured between gypsum board base paper to form a gypsum board. Dry at 2.5 ° C. for 2.5 hours. The adhesion between the gypsum and the gypsum board base paper after drying was sufficient, and no peeling was observed. The specific gravity of the obtained gypsum board was 0.86. The water absorption (Aw 2 , Aw 24 ) after immersing the board in water at 20 ° C. ± 1 ° C. for 2 hours and 24 hours was measured.
【００２０】[0020]
【数１】 結果を表−１に示す。(Equation 1) The results are shown in Table 1.
【００２１】実施例２ メチルハイドロジェンポリシロキサン（信越化学製ＫＦ
−９９）９５部、ノニオン性の乳化剤ポリオキシエチレ
ンノニルフエニルエーテル（花王製エマルゲン９１０）
５部と水 部をホモミキサーにて乳化し、メチルハイ
ドロジェンポリシロキサンを４５％含むエマルションを
得た。Example 2 Methyl hydrogen polysiloxane (KF manufactured by Shin-Etsu Chemical Co., Ltd.)
-99) 95 parts, nonionic emulsifier polyoxyethylene nonylphenyl ether (Emulgen 910 manufactured by Kao)
5 parts and water were emulsified with a homomixer to obtain an emulsion containing 45% of methyl hydrogen polysiloxane.
【００２２】β半水石膏（吉野石膏製桜印Ａ級）１００
部に上記のメチルハイドロジェンポリシロキサンのエマ
ルションをメチルハイドロジェンポリシロキサンとして
０．６部、セメント１部及び水８０部を添加しスラリー
とし、これを石膏ボード原紙の間に流し込み石膏ボード
とし、７０℃で２．５時間乾燥した。乾燥後の石膏と石
膏ボード原紙の接着は十分であり剥離は認められなかっ
た。得られた石膏ボードの比重は０．７５であった。該
ボードの吸水率（Ａｗ2 、Ａｗ24）を表ー１に示す。Β hemihydrate gypsum (Yoshino Gypsum Sakura-in Class A) 100
To 0.6 part of the above emulsion of methyl hydrogen polysiloxane as methyl hydrogen polysiloxane, 1 part of cement and 80 parts of water were added to form a slurry, which was poured between gypsum board base paper to form a gypsum board. Dry at 2.5 ° C. for 2.5 hours. The adhesion between the gypsum and the gypsum board base paper after drying was sufficient, and no peeling was observed. The specific gravity of the obtained gypsum board was 0.75. Table 1 shows the water absorption (Aw 2 , Aw 24 ) of the board.
【００２３】実施例３ β半水石膏（吉野石膏製桜印Ａ級）１００部にメチルハ
イドロジェンポリシロキサン０．６部、セメント１部及
び水８０部を添加しスラリーとし、これを石膏ボード原
紙の間に流し込み石膏ボードとし、７０℃で２．５時間
乾燥した。乾燥後の石膏と石膏ボード原紙の接着は十分
であり剥離は認められなかった。得られた石膏ボードの
比重は０．８８であった。該ボードの吸水率（Ａｗ2 、
Ａｗ24）を表−１に示す。Example 3 A slurry was prepared by adding 0.6 parts of methylhydrogenpolysiloxane, 1 part of cement and 80 parts of water to 100 parts of β-hemihydrate gypsum (Sakura-in Class A made by Yoshino Gypsum) to prepare a gypsum board base paper. The mixture was poured into a gypsum board and dried at 70 ° C. for 2.5 hours. The adhesion between the gypsum and the gypsum board base paper after drying was sufficient, and no peeling was observed. The specific gravity of the obtained gypsum board was 0.88. The water absorption of the board (Aw 2 ,
Aw 24 ) is shown in Table 1.
【００２４】実施例４ セメントの添加量を０．２部とした他は実施例１と同様
にし石膏ボードを得た。乾燥後の石膏と石膏ボード原紙
の接着は十分であり剥離は認められなかった。得られた
石膏ボードの比重は０．８８であった。該ボードの吸水
率（Ａｗ2 、Ａｗ24）を表−１に示す。Example 4 A gypsum board was obtained in the same manner as in Example 1 except that the amount of cement was changed to 0.2 part. The adhesion between the gypsum and the gypsum board base paper after drying was sufficient, and no peeling was observed. The specific gravity of the obtained gypsum board was 0.88. Table 1 shows the water absorption (Aw 2 , Aw 24 ) of the board.
【００２５】実施例５ メチルハイドロジェンポリシロキサンの添加量を０．３
部、セメントの添加量を０．４部とした他は実施例１と
同様にし石膏ボードを得た。乾燥後の石膏と石膏ボード
原紙の接着は十分であり剥離は認められなかった。得ら
れた石膏ボードの比重は０．８７であった。該ボードの
吸水率（Ａｗ2 、Ａｗ24）を表−１に示す。Example 5 The addition amount of methyl hydrogen polysiloxane was 0.3
Gypsum board was obtained in the same manner as in Example 1 except that the amount of cement and the amount of cement were changed to 0.4 part. The adhesion between the gypsum and the gypsum board base paper after drying was sufficient, and no peeling was observed. The specific gravity of the obtained gypsum board was 0.87. Table 1 shows the water absorption (Aw 2 , Aw 24 ) of the board.
【００２６】実施例６ セメントの代わりにゾノトライトを主成分とする珪酸カ
ルシウム水和物の粉末を１部とした他は実施例１と同様
にし石膏ボードを得た。乾燥後の石膏と石膏ボード原紙
の接着は十分であり剥離は認められなかった。得られた
石膏ボードの比重は０．８７であった。該ボードの吸水
率（Ａｗ2 、Ａｗ24）を表−１に示す。Example 6 A gypsum board was obtained in the same manner as in Example 1 except that instead of cement, 1 part of a powder of calcium silicate hydrate containing zonotolite as a main component was used. The adhesion between the gypsum and the gypsum board base paper after drying was sufficient, and no peeling was observed. The specific gravity of the obtained gypsum board was 0.87. Table 1 shows the water absorption (Aw 2 , Aw 24 ) of the board.
【００２７】実施例７ セメントの代わりにゾノトライトを主成分とする珪酸カ
ルシウム水和物の粉末を０．４部とした他は実施例１と
同様にし石膏ボードを得た。乾燥後の石膏と石膏ボード
原紙の接着は十分であり剥離は認められなかった。得ら
れた石膏ボードの比重は０．８８であった。該ボードの
吸水率（Ａｗ2 、Ａｗ24）を表−１に示す。Example 7 A gypsum board was obtained in the same manner as in Example 1 except that 0.4 parts of a powder of calcium silicate hydrate containing zonotolite as a main component was used instead of cement. The adhesion between the gypsum and the gypsum board base paper after drying was sufficient, and no peeling was observed. The specific gravity of the obtained gypsum board was 0.88. Table 1 shows the water absorption (Aw 2 , Aw 24 ) of the board.
【００２８】実施例８ β半水石膏（吉野石膏製桜印Ａ級）１００部にメチルハ
イドロジェンポリシロキサンのオイルを１部、水酸化マ
グネシウムを１部及び水を８０部添加しスラリーとし、
これを石膏ボード原紙の間に流し込み石膏ボードとし、
７０℃で２．５時間乾燥した。乾燥後の石膏と石膏ボー
ド原紙の接着は十分であり剥離は認められなかった。得
られた石膏ボードの比重は０．８８であった。該ボード
の吸水率（Ａｗ2 、Ａｗ24）を表−１に示す。Example 8 A slurry was prepared by adding 1 part of methyl hydrogen polysiloxane oil, 1 part of magnesium hydroxide and 80 parts of water to 100 parts of β-hemihydrate gypsum (Sakura-in Class A made by Yoshino Gypsum) to form a slurry.
Pour this between gypsum board base paper to make gypsum board,
Dry at 70 ° C. for 2.5 hours. The adhesion between the gypsum and the gypsum board base paper after drying was sufficient, and no peeling was observed. The specific gravity of the obtained gypsum board was 0.88. Table 1 shows the water absorption (Aw 2 , Aw 24 ) of the board.
【００２９】実施例９ メチルハイドロジェンポリシロキサンの添加量を０．５
部、セメントの代わりに水酸化マグネシウムを０．５部
とした他は実施例１と同様にし石膏ボードを得た。乾燥
後の石膏と石膏ボード原紙の接着は十分であり剥離は認
められなかった。得られた石膏ボードの比重は０．８６
であった。該ボードの吸水率（Ａｗ2 、Ａｗ24）を表−
１に示す。Example 9 The addition amount of methyl hydrogen polysiloxane was 0.5
Gypsum board was obtained in the same manner as in Example 1 except that 0.5 parts of magnesium hydroxide was used in place of the cement. The adhesion between the gypsum and the gypsum board base paper after drying was sufficient, and no peeling was observed. The specific gravity of the obtained gypsum board is 0.86
Met. Table-Water absorption (Aw 2 , Aw 24 ) of the board
It is shown in FIG.
【００３０】実施例１０ 実施例１において、メチルハイドロジェンポリシロキサ
ンを０．１部、セメントを１部とし実施例１と同様に石
膏ボードを得た。乾燥後の石膏と石膏ボード原紙の接着
は十分であり剥離は認められなかった。得られた石膏成
形体の比重は０．８６であった。該ボードの吸水率（Ａ
ｗ2 、Ａｗ24）を表−１に示す。Example 10 A gypsum board was obtained in the same manner as in Example 1 except that 0.1 part of methyl hydrogen polysiloxane and 1 part of cement were used. The adhesion between the gypsum and the gypsum board base paper after drying was sufficient, and no peeling was observed. The specific gravity of the obtained gypsum molded product was 0.86. The water absorption of the board (A
w 2 , Aw 24 ) are shown in Table 1.
【００３１】比較例１ β半水石膏（吉野石膏製桜印Ａ級）１００部に水８０部
を添加し石膏スラリーとし、これを石膏ボード原紙の間
に流し込み石膏ボードとし、７０℃で２．５時間乾燥し
た。乾燥後の石膏と石膏ボード原紙の接着は十分であり
剥離は認められなかった。得られた石膏ボードの比重は
０．８９であった。該ボードの吸水率（Ａｗ2 、Ａ
ｗ24）を表−１に示す。Comparative Example 1 80 parts of water was added to 100 parts of β hemihydrate gypsum (Yoshino Gypsum Sakura-in Class A) to form a gypsum slurry, which was poured into a gypsum board base paper to form a gypsum board. Dry for 5 hours. The adhesion between the gypsum and the gypsum board base paper after drying was sufficient, and no peeling was observed. The specific gravity of the obtained gypsum board was 0.89. The water absorption (Aw 2 , A
w 24 ) is shown in Table 1.
【００３２】比較例２ β半水石膏（吉野石膏製桜印Ａ級）１００部に実施例１
で製造したエマルションをメチルハイドロジェンポリシ
ロキサンとして１部及び水８０部を添加し石膏スラリー
とし、これを石膏ボード原紙の間に流し込み石膏ボード
とし、７０℃で２．５時間乾燥した。乾燥後の石膏と石
膏ボード原紙の接着は十分であり剥離は認められなかっ
た。得られた石膏成形体の比重は０．９１であった。該
ボードの吸水率（Ａｗ2 、Ａｗ24）を表−１に示す。Comparative Example 2 Example 1 was applied to 100 parts of β hemihydrate gypsum (Yoshino Gypsum Sakura-in Class A).
The emulsion prepared in 1) was added as methylhydrogenpolysiloxane, 1 part of water and 80 parts of water were added to form a gypsum slurry, which was poured into gypsum board base paper to form a gypsum board, and dried at 70 ° C. for 2.5 hours. The adhesion between the gypsum and the gypsum board base paper after drying was sufficient, and no peeling was observed. The specific gravity of the obtained gypsum molded product was 0.91. Table 1 shows the water absorption (Aw 2 , Aw 24 ) of the board.
【００３３】比較例３ セメントの代わりに消石灰１部添加した他は実施例１と
同様に石膏ボードを得た。乾燥後の石膏と石膏ボード原
紙の接着はまったくなく、石膏ボード原紙は上下とも剥
離していた。得られた石膏成形体の比重は０．８６であ
った。該ボードの吸水率（Ａｗ2 、Ａｗ24）を表−１に
示す。Comparative Example 3 A gypsum board was obtained in the same manner as in Example 1 except that 1 part of slaked lime was added instead of cement. There was no adhesion between the gypsum and the gypsum board base paper after drying, and the gypsum board base paper was peeled off both up and down. The specific gravity of the obtained gypsum molded product was 0.86. Table 1 shows the water absorption (Aw 2 , Aw 24 ) of the board.
【００３４】比較例４ メチルハイドロジェンポリシロキサンを１部、セメント
の代わりに消石灰を０．８部添加した他は実施例１と同
様に石膏ボードを得た。乾燥後の石膏と石膏ボード原紙
の接着はまったくなく石膏ボード原紙は上下とも剥離し
ていた。得られた石膏成形体の比重は０．６８であっ
た。該ボードの吸水率（Ａｗ2 、Ａｗ24）を表−１に示
す。Comparative Example 4 A gypsum board was obtained in the same manner as in Example 1 except that 1 part of methylhydrogenpolysiloxane was added and 0.8 part of slaked lime was added instead of cement. There was no adhesion between the gypsum and the gypsum board base paper after drying, and the gypsum board base paper was peeled off both at the top and bottom. The specific gravity of the obtained gypsum molded body was 0.68. Table 1 shows the water absorption (Aw 2 , Aw 24 ) of the board.
【００３５】比較例５ セメントの代わりに炭酸カルシウム１部添加した他は実
施例１と同様に石膏ボードを得た。乾燥後の石膏と石膏
ボード原紙の接着は十分であり剥離は認められなかっ
た。得られた石膏成形体の比重は０．８６であった。該
ボードの吸水率（Ａｗ2 、Ａｗ24）を表−１に示す。Comparative Example 5 A gypsum board was obtained in the same manner as in Example 1 except that 1 part of calcium carbonate was added instead of cement. The adhesion between the gypsum and the gypsum board base paper after drying was sufficient, and no peeling was observed. The specific gravity of the obtained gypsum molded product was 0.86. Table 1 shows the water absorption (Aw 2 , Aw 24 ) of the board.
【００３６】比較例６ セメントの代わりに水酸化アルミニウム１部を添加した
他は実施例５と同様に石膏ボードを得た。乾燥後の石膏
と石膏ボード原紙の接着は十分であり剥離は認められな
かった。得られた石膏成形体の比重は０．８６であっ
た。該ボードの吸水率（Ａｗ2 、Ａｗ24）を表−１に示
す。Comparative Example 6 A gypsum board was obtained in the same manner as in Example 5 except that 1 part of aluminum hydroxide was added instead of cement. The adhesion between the gypsum and the gypsum board base paper after drying was sufficient, and no peeling was observed. The specific gravity of the obtained gypsum molded product was 0.86. Table 1 shows the water absorption (Aw 2 , Aw 24 ) of the board.
【００３７】比較例７ β半水石膏（吉野石膏製桜印Ａ級）１００部にジメチル
ポリシロキサン（東レダウコウニングシリコン製ＳＨ−
２００）を１部、セメントを１部及び水を８０部添加し
スラリーとし、これを石膏ボード原紙の間に流し込み石
膏ボードとし、７０℃で２．５時間乾燥した。乾燥後の
石膏と石膏ボード原紙の接着は十分であり剥離は認めら
れなかった。得られた石膏ボードの比重は０．８８であ
った。該石膏ボードの２時間浸漬後の吸水率は４７．８
％でありまったく撥水性を示さなかった。Comparative Example 7 100 parts of β hemihydrate gypsum (Yoshino Gypsum Sakura Mark A grade) was added to dimethylpolysiloxane (SH- made by Toray Downing Silicone).
200), 1 part of cement and 80 parts of water were added to form a slurry, which was poured into a gypsum board base paper to form a gypsum board, and dried at 70 ° C. for 2.5 hours. The adhesion between the gypsum and the gypsum board base paper after drying was sufficient, and no peeling was observed. The specific gravity of the obtained gypsum board was 0.88. The water absorption after immersion of the gypsum board for 2 hours is 47.8.
% And did not show any water repellency.
【００３８】比較例８ ジメチルポリシロキサン（東レダウコウニングシリコン
製ＳＨ−２００）８０部とメチルハイドロジェンポリシ
ロキサン（信越化学製ＫＦ−９９）２０部とをノニオン
製の乳化剤ポリオキシエチレンノニルフェニルエーテル
（花王製エマルゲン９１０）５部と水をホモミキサーに
て乳化しポリシロキサン化合物を４５％含むエマルショ
ンを製造した。COMPARATIVE EXAMPLE 8 80 parts of dimethylpolysiloxane (SH-200 manufactured by Toray Dow Corning Silicon) and 20 parts of methyl hydrogen polysiloxane (KF-99 manufactured by Shin-Etsu Chemical) were mixed with 20 parts of nonionic emulsifier polyoxyethylene nonylphenyl ether. 5 parts of (Emulgen 910 manufactured by Kao) and water were emulsified by a homomixer to produce an emulsion containing 45% of a polysiloxane compound.
【００３９】β半水石膏（吉野石膏製桜印Ａ級）１００
部に上記のエマルションをポリシロキサン化合物として
１部及び水８０部を添加しスラリーとしこれを石膏ボー
ド原紙の間に流し込み石膏ボードとし、７０℃で２．５
時間乾燥した。乾燥後の石膏と石膏ボード原紙の接着は
十分であり剥離は認められなかった。得られた石膏ボー
ドの比重は０．８６であった。該石膏ボードの２時間浸
漬後の吸水率は４８．８％でありまったく撥水性を示さ
なかった。Β hemihydrate gypsum (Yoshino Gypsum Sakura-in Class A) 100
1 part of the above emulsion as a polysiloxane compound and 80 parts of water were added to a slurry, and the slurry was poured between gypsum board base paper to form a gypsum board.
Dried for hours. The adhesion between the gypsum and the gypsum board base paper after drying was sufficient, and no peeling was observed. The specific gravity of the obtained gypsum board was 0.86. The water absorption of the gypsum board after immersion for 2 hours was 48.8%, indicating no water repellency.
【００４０】[0040]
【表１】 [Table 1]
【００４１】[0041]
【発明の効果】本発明の石膏ボードは、従来の撥水剤を
使用したものに比べ添加量が少なくしてより高い耐水性
を有し石膏と石膏ボード原紙の接着力が十分に保たれて
いる。The gypsum board of the present invention has a lower water content and higher water resistance than the conventional gypsum board using a water repellent, and the adhesive strength between the gypsum and the gypsum board base paper is sufficiently maintained. I have.
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.7 識別記号 ＦＩ Ｃ０４Ｂ 22:06） Ｃ０４Ｂ 22:06） Ｚ 111:27 111:27 111:28 111:28 (72)発明者 小沢 八十治 神奈川県横浜市緑区鴨志田町1000番地 三菱化成株式会社総合研究所内 (72)発明者 粟田 満 神奈川県横浜市緑区鴨志田町1000番地 三菱化成株式会社総合研究所内 (56)参考文献 特開 昭63−201049（ＪＰ，Ａ) 特開 昭61−83664（ＪＰ，Ａ) 特開 平７−330413（ＪＰ，Ａ) 米国特許3455710（ＵＳ，Ａ) (58)調査した分野(Int.Cl.7，ＤＢ名) C04B 2/00 - 32/02 ＣＡ（ＳＴＮ) ＲＥＧＩＳＴＲＹ（ＳＴＮ)──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. 7 Identification symbol FI C04B 22:06) C04B 22:06) Z 111: 27 111: 27 111: 28 111: 28 (72) Inventor Yasuji Ozawa 1,000 Kamoshita-cho, Midori-ku, Yokohama-shi, Kanagawa Prefecture, Mitsubishi Chemical Co., Ltd. (72) Inventor Mitsuru Awada 1000 Kamoshita-cho, Midori-ku, Yokohama-shi, Kanagawa Prefecture Mitsubishi Chemical Co., Ltd. -201049 (JP, A) JP-A-61-83664 (JP, A) JP-A-7-330413 (JP, A) US Patent 3,557,710 (US, A) (58) Fields investigated (Int. Cl. 7 , DB name) C04B 2/00-32/02 CA (STN) REGISTRY (STN)
Claims (8)
と、珪酸カルシウム水和物、酸化マグネシウム及び水酸
化マグネシウムから選ばれる少なくとも１種と石膏とを
含む石膏組成物及びボード原紙からなることを特徴とす
る撥水性石膏ボード。1. Methyl hydrogen polysiloxane , calcium silicate hydrate, magnesium oxide and hydroxyl
A water-repellent gypsum board comprising a gypsum composition containing at least one selected from magnesium oxide and gypsum, and board base paper.
て、メチルハイドロジェンポリシロキサン０．２〜５重
量部、珪酸カルシウム水和物、酸化マグネシウム及び水
酸化マグネシウムから選ばれる少なくとも１種０．１〜
１０重量部を含むことを特徴とする請求項１に記載の撥
水性石膏ボード。2. A gypsum composition containing 0.2 to 5 parts by weight of methyl hydrogen polysiloxane, calcium silicate hydrate, magnesium oxide and water based on 100 parts by weight of gypsum
At least one selected from magnesium oxide 0.1 to
The water-repellent gypsum board according to claim 1, comprising 10 parts by weight .
てメチルハイドロジェンポリシロキサンを０．２〜１重
量部、珪酸カルシウム水和物、酸化マグネシウム及び水
酸化マグネシウムから選ばれる少なくとも１種０．２〜
１重量部を含むことを特徴とする請求項１に記載の撥水
性石膏ボード。3. A gypsum composition comprising 0.2 to 1 part by weight of methyl hydrogen polysiloxane, 100 parts by weight of gypsum, calcium silicate hydrate, magnesium oxide and water
At least one selected from magnesium oxide 0.2 to
The water-repellent gypsum board according to claim 1, comprising 1 part by weight .
サンと、珪酸カルシウム水和物、酸化マグネシウム及び
水酸化マグネシウムから選ばれる少なくとも１種とを添
加混合して水スラリー化した石膏組成物を、ボード原紙
間に流し込み、成形硬化することを特徴とする撥水性石
膏ボードの製造方法。4. Gypsum, methyl hydrogen polysiloxane, calcium silicate hydrate, magnesium oxide and
A method for producing a water-repellent gypsum board, wherein a gypsum composition obtained by adding and mixing at least one selected from magnesium hydroxide to form a water slurry is poured between board base papers and molded and hardened.
水中に乳化してなるエマルションとして添加混合して水
スラリー化した石膏組成物を用いることを特徴とする請
求項４に記載の撥水性石膏ボードの製造方法。5. admixed as an emulsion obtained by emulsifying the methyl hydrogen polysiloxane in water water
The method for producing a water-repellent gypsum board according to claim 4, wherein a gypsum composition in the form of a slurry is used.
エマルションがポリビニルアルコ−ルを乳化剤として用
いることを特徴とする請求項５に記載の撥水性石膏ボー
ドの製造方法。6. The method for producing a water-repellent gypsum board according to claim 5, wherein the emulsion of methylhydrogenpolysiloxane uses polyvinyl alcohol as an emulsifier.
ロジェンポリシロキサン０．２〜５重量部、珪酸カルシ
ウム水和物、酸化マグネシウム及び水酸化マグネシウム
から選ばれる少なくとも１種を０．１〜１０重量部添加
混合して水スラリー化した石膏組成物を用いることを特
徴とする請求項４ないし６のいずれかに記載の撥水性石
膏ボードの製造方法。7. 0.2 to 5 parts by weight of methyl hydrogen polysiloxane per 100 parts by weight of gypsum, calcium silicate
A gypsum composition obtained by adding and mixing 0.1 to 10 parts by weight of at least one selected from the group consisting of hydrated magnesium, magnesium oxide and magnesium hydroxide to form a water slurry . 7. The method for producing a water-repellent gypsum board according to any one of claims 6 to 6.
ロジェンポリシロキサン０．２〜１重量部、珪酸カルシ
ウム水和物、酸化マグネシウム及び水酸化マグネシウム
から選ばれる少なくとも１種を０．１〜１重量部添加混
合して水スラリー化した石膏組成物を用いることを特徴
とする請求項４ないし６のいずれかに記載の撥水性石膏
ボードの製造方法。8. 0.2 to 1 part by weight of methyl hydrogen polysiloxane, 100 parts by weight of gypsum, calcium silicate
A gypsum composition obtained by adding and mixing 0.1 to 1 part by weight of at least one selected from the group consisting of aluminum hydrate, magnesium oxide and magnesium hydroxide to form a water slurry . 7. The method for producing a water-repellent gypsum board according to any one of claims 6 to 6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12265594A JP3284756B2 (en) | 1994-06-03 | 1994-06-03 | Water repellent gypsum board |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12265594A JP3284756B2 (en) | 1994-06-03 | 1994-06-03 | Water repellent gypsum board |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH07330410A JPH07330410A (en) | 1995-12-19 |
| JP3284756B2 true JP3284756B2 (en) | 2002-05-20 |
Family
ID=14841355
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP12265594A Expired - Lifetime JP3284756B2 (en) | 1994-06-03 | 1994-06-03 | Water repellent gypsum board |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3284756B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023118475A1 (en) * | 2021-12-24 | 2023-06-29 | Etex Building Performance International Sas | Process for producing water resistant plasterboards with fiber cement powder |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6106607A (en) * | 1999-09-10 | 2000-08-22 | Dow Corning Corporation | Composition for hydrophobing gypsum and methods for the preparation and use thereof |
| US7892472B2 (en) * | 2004-08-12 | 2011-02-22 | United States Gypsum Company | Method of making water-resistant gypsum-based article |
| US8323785B2 (en) | 2011-02-25 | 2012-12-04 | United States Gypsum Company | Lightweight, reduced density fire rated gypsum panels |
| JP2015514602A (en) | 2012-02-17 | 2015-05-21 | ユナイテッド・ステイツ・ジプサム・カンパニー | Gypsum product with highly efficient endothermic additive |
| JP6412431B2 (en) * | 2014-02-08 | 2018-10-24 | 吉野石膏株式会社 | Bearing wall structure of wooden outer wall and its construction method |
| KR20210104726A (en) * | 2018-12-20 | 2021-08-25 | 크나우프 깁스 카게 | Gypsum building materials with improved high temperature resistance |
-
1994
- 1994-06-03 JP JP12265594A patent/JP3284756B2/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023118475A1 (en) * | 2021-12-24 | 2023-06-29 | Etex Building Performance International Sas | Process for producing water resistant plasterboards with fiber cement powder |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH07330410A (en) | 1995-12-19 |
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