JPH0451346B2 - - Google Patents
Info
- Publication number
- JPH0451346B2 JPH0451346B2 JP61314625A JP31462586A JPH0451346B2 JP H0451346 B2 JPH0451346 B2 JP H0451346B2 JP 61314625 A JP61314625 A JP 61314625A JP 31462586 A JP31462586 A JP 31462586A JP H0451346 B2 JPH0451346 B2 JP H0451346B2
- Authority
- JP
- Japan
- Prior art keywords
- gypsum
- slurry
- layer
- fiber
- hemihydrate
- 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
- 229910052602 gypsum Inorganic materials 0.000 claims description 58
- 239000010440 gypsum Substances 0.000 claims description 58
- 239000002002 slurry Substances 0.000 claims description 45
- 239000000835 fiber Substances 0.000 claims description 32
- ZOMBKNNSYQHRCA-UHFFFAOYSA-J calcium sulfate hemihydrate Chemical compound O.[Ca+2].[Ca+2].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O ZOMBKNNSYQHRCA-UHFFFAOYSA-J 0.000 claims description 29
- 238000004519 manufacturing process Methods 0.000 claims description 8
- -1 sodium alkyl sulfate Chemical class 0.000 claims description 7
- 229910052708 sodium Inorganic materials 0.000 claims description 6
- 239000011734 sodium Substances 0.000 claims description 6
- 238000001035 drying Methods 0.000 claims description 5
- 239000002994 raw material Substances 0.000 claims description 4
- 229920003171 Poly (ethylene oxide) Polymers 0.000 claims description 3
- 150000008051 alkyl sulfates Chemical class 0.000 claims description 3
- 238000003756 stirring Methods 0.000 claims description 3
- 239000010410 layer Substances 0.000 description 59
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 11
- 238000005452 bending Methods 0.000 description 10
- 239000000463 material Substances 0.000 description 10
- 238000000034 method Methods 0.000 description 10
- 230000005484 gravity Effects 0.000 description 9
- 230000000052 comparative effect Effects 0.000 description 5
- 239000006260 foam Substances 0.000 description 5
- 239000004372 Polyvinyl alcohol Substances 0.000 description 4
- 239000011248 coating agent Substances 0.000 description 4
- 238000000576 coating method Methods 0.000 description 4
- 230000009970 fire resistant effect Effects 0.000 description 4
- 239000003365 glass fiber Substances 0.000 description 4
- 230000001771 impaired effect Effects 0.000 description 4
- 229920002451 polyvinyl alcohol Polymers 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- 238000009423 ventilation Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 239000003945 anionic surfactant Substances 0.000 description 2
- 239000004566 building material Substances 0.000 description 2
- 150000004683 dihydrates Chemical class 0.000 description 2
- 239000004744 fabric Substances 0.000 description 2
- 239000004088 foaming agent Substances 0.000 description 2
- 238000009415 formwork Methods 0.000 description 2
- 229920000609 methyl cellulose Polymers 0.000 description 2
- 239000001923 methylcellulose Substances 0.000 description 2
- 235000010981 methylcellulose Nutrition 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000005192 partition Methods 0.000 description 2
- 239000011505 plaster Substances 0.000 description 2
- 239000002985 plastic film Substances 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 230000003014 reinforcing effect Effects 0.000 description 2
- 239000000779 smoke Substances 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 239000004094 surface-active agent Substances 0.000 description 2
- 229920002978 Vinylon Polymers 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 230000001413 cellular effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000018044 dehydration Effects 0.000 description 1
- 238000006297 dehydration reaction Methods 0.000 description 1
- 239000012784 inorganic fiber Substances 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 239000011229 interlayer Substances 0.000 description 1
- 238000004898 kneading Methods 0.000 description 1
- 229920005615 natural polymer Polymers 0.000 description 1
- 229920000620 organic polymer Polymers 0.000 description 1
- 238000010422 painting Methods 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 239000012783 reinforcing fiber Substances 0.000 description 1
- 229920005613 synthetic organic polymer Polymers 0.000 description 1
Landscapes
- Laminated Bodies (AREA)
- Producing Shaped Articles From Materials (AREA)
Description
【発明の詳細な説明】
［産業上の利用分野］
本発明は軽量石膏硬化体及びその製造方法に係
り、特に鉄骨耐火被覆材、耐火間仕切材等に使用
するに好適な改良された軽量石膏硬化体及びその
製造方法に関する。[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a lightweight hardened gypsum body and a method for producing the same, and in particular, an improved lightweight hardened gypsum body suitable for use in fireproof coating materials for steel frames, fireproof partition materials, etc. body and its manufacturing method.
［従来の技術］
気泡を多量に含む半水石膏スラリーを硬化させ
てつくる、軽量石膏硬化体（多泡質石膏板）は、
その軽量性と共に、石膏（二水石膏）の特徴であ
る不燃性、100℃以上に加熱されたときの結晶水
の脱水による吸熱反応、並びに硬化体内に含有さ
れる多量の気泡による断熱作用等の優れた耐火特
性から、鉄骨耐火被覆材、耐火間仕切材等の建材
等として従来より広く用いられている。[Prior art] A lightweight gypsum hardened body (multicellular gypsum board) is made by curing hemihydrate gypsum slurry containing a large amount of air bubbles.
In addition to its light weight, gypsum (gypsum dihydrate) has characteristics such as nonflammability, endothermic reaction due to dehydration of crystalline water when heated to 100℃ or higher, and heat insulation effect due to the large amount of air bubbles contained in the hardened body. Due to its excellent fire-resistant properties, it has been widely used as building materials such as fire-resistant coating materials for steel frames and fire-resistant partition materials.
［発明が解決しようとする問題点］
しかしながら、このような軽量石膏硬化体は、
多量の気泡を含有しているために、表面がもろく
て取扱い難く、また表面が平滑となり難いなどの
欠点がある。[Problems to be solved by the invention] However, such a lightweight gypsum hardened body,
Since it contains a large amount of air bubbles, it has disadvantages such as a brittle surface that is difficult to handle, and a surface that is difficult to smooth.
このため、従来において、軽量石膏硬化体の板
の両表面を紙又は布で覆う方法が提案されている
が（特開昭57−144749）、火災時の耐火材として
の軽量石膏硬化体の使用目的からは、紙、布のよ
うな可燃性ないし発煙性の物質を用いることは耐
火材としての特性を阻害することとなり、有利な
方法とはいえない。 For this reason, a method of covering both surfaces of a lightweight hardened gypsum board with paper or cloth has been proposed (Japanese Unexamined Patent Publication No. 57-144749). From the viewpoint of the purpose, using flammable or smoke-emitting substances such as paper or cloth is not an advantageous method because it impairs its properties as a fireproof material.
［問題点を解決するための手段］
本発明はこのような従来の多泡質軽量石膏硬化
体板の問題点を解決し、表面が平滑で固く、かつ
高い曲げ強度を有し、しかも耐火材としての十分
な不燃性を備える軽量石膏硬化体と、これを製造
する方法を提供するものであつて、
繊維含有多泡質石膏層とこれをはさむ合計厚さ
が全層厚の10〜50％量の繊維含有緻密質石膏層と
からなることを特徴とする軽量石膏硬化体、
及び
型枠に繊維混入半水石膏スラリーを流し込み、
その上に、アルキル硫酸ソーダ、アルキルベンゼ
ンスルホン酸ソーダ又はポリオキシエチレンアル
キル硫酸塩を半水石膏に対し0.02〜2.0重量％添
加して撹拌することにより、気泡を多量に混入し
た繊維混入半水石膏スラリーを流し込み、更にそ
の上に繊維混入半水石膏スラリーを流し込んで硬
化、乾燥させることを特徴とする軽量石膏硬化体
の製造方法、
を要旨とするものである。[Means for Solving the Problems] The present invention solves the problems of the conventional multicellular lightweight hardened gypsum board, has a smooth and hard surface, has high bending strength, and is made of fireproof material. The present invention provides a lightweight hardened gypsum body with sufficient nonflammability as a gypsum material, and a method for producing the same, wherein the total thickness of the fiber-containing porous gypsum layer and the sandwiching layers is 10 to 50% of the total layer thickness. A lightweight gypsum hardened body characterized by comprising a dense gypsum layer containing fibers of a certain amount;
Then, by adding 0.02 to 2.0% by weight of sodium alkyl sulfate, sodium alkylbenzenesulfonate, or polyoxyethylene alkyl sulfate to the gypsum hemihydrate and stirring, a slurry of gypsum hemihydrate mixed with fibers containing a large amount of air bubbles is obtained. A method for producing a lightweight hardened gypsum body, characterized by pouring a slurry of gypsum hemihydrate mixed with fibers thereon, hardening and drying the slurry.
以下、本発明を詳細に説明する。 The present invention will be explained in detail below.
本発明の軽量石膏硬化体は、繊維含有多泡質石
膏層（以下、これを「第二層」ということがあ
る。）とこれをはさむ全層厚の10〜50％量の繊維
含有緻密質石膏層（以下、これらを「第一層」及
び「第三層」ということがある。）とからなる。 The lightweight hardened gypsum body of the present invention consists of a fiber-containing porous gypsum layer (hereinafter sometimes referred to as the "second layer") and a fiber-containing dense layer that is 10 to 50% of the total thickness of the layers sandwiching this layer. It consists of a gypsum layer (hereinafter these may be referred to as the "first layer" and "third layer").
本発明において、硬化体の両表面を形成する繊
維補強緻密質石膏層、即ち第一層及び第三層は、
半水石膏及び水を主体とし、これに好ましくは原
料の半水石膏に対し0.5〜５重量部の繊維、更に
必要に応じて少量の凝結調節剤を混入したスラリ
ーを硬化せしめて形成され、その比重は一般に
0.9〜1.1程度の、繊維含有石膏硬化層である。 In the present invention, the fiber-reinforced dense gypsum layers forming both surfaces of the cured body, that is, the first layer and the third layer,
It is formed by curing a slurry consisting mainly of gypsum hemihydrate and water, preferably mixed with 0.5 to 5 parts by weight of fibers based on the raw material gypsum hemihydrate, and a small amount of a setting regulator if necessary. Specific gravity is generally
It is a fiber-containing gypsum hardening layer with a thickness of about 0.9 to 1.1.
第一層及び第三層において、原料の半水石膏に
対する繊維の割合が少な過ぎると十分な補強効果
が得られず、また逆に多過ぎると成形性が損なわ
れる場合がある。従つて、繊維量は上記範囲とす
るのが適当である。 In the first and third layers, if the ratio of fiber to the raw material gypsum hemihydrate is too small, a sufficient reinforcing effect cannot be obtained, and if it is too large, moldability may be impaired. Therefore, it is appropriate that the amount of fiber is within the above range.
これら、第一層及び第三層の厚さは薄過ぎると
本発明による十分な強度向上効果が得られず、ま
た逆に厚過ぎると硬化体の比重が大きくなり、軽
量性が損なわれる。このため、第一層及び第三層
は、その合計厚さが軽量石膏硬化体全層の厚さの
10〜50％程度の厚さとなるようにするのが適当で
ある。 If the thickness of the first layer and the third layer is too thin, the sufficient strength-improving effect of the present invention cannot be obtained, and on the other hand, if the thickness is too thick, the specific gravity of the cured product increases and the lightness is impaired. Therefore, the total thickness of the first and third layers is equal to the total thickness of the lightweight gypsum hardened body.
It is appropriate that the thickness be approximately 10 to 50%.
この第一層及び第三層の補強繊維としては、ガ
ラス繊維等の無機質繊維又は天然もしくは合成の
有機高分子繊維が挙げられる。ガラス繊維として
は、スラリー混練時にモノフイラメントに解繊す
る収束の弱いものが好適であり、また、有機高分
子繊維の具体例としてはビニロン繊維等が挙げら
れる。 Examples of the reinforcing fibers for the first and third layers include inorganic fibers such as glass fibers, and natural or synthetic organic polymer fibers. As the glass fibers, those with weak convergence that break into monofilaments during slurry kneading are suitable, and specific examples of the organic polymer fibers include vinylon fibers and the like.
一方、中央の繊維含有多泡質石膏層、即ち第二
層は、半水石膏と水を主体とし、更に繊維を混入
したスラリーに、特定の起泡剤と公知の界面活性
剤を加えて、多量の気泡を導入して硬化させた硬
化体層である。なお、この場合、必要に応じて更
に少量の凝結調節剤を用いることもできる。第二
層は比重0.4〜0.7程度であることが好ましく、ま
た繊維の使用量は原料の半水石膏に対して0.5〜
５重量部程度とするのが好適である。第二層に用
いる繊維としても、上述の第一層及び第三層に用
いる繊維を使用することができる。 On the other hand, the central fiber-containing multicellular gypsum layer, that is, the second layer, is made by adding a specific foaming agent and a known surfactant to a slurry mainly composed of gypsum hemihydrate and water, with fibers mixed in. This is a cured material layer that is cured by introducing a large amount of air bubbles. In this case, a smaller amount of a setting regulator can be used if necessary. It is preferable that the second layer has a specific gravity of about 0.4 to 0.7, and the amount of fiber used is 0.5 to 0.5 to 0.5 to 0.7, based on the raw material gypsum hemihydrate.
The amount is preferably about 5 parts by weight. The fibers used in the above-mentioned first and third layers can also be used as the fibers used in the second layer.
後掲の実施例１と比較例１の結果の比較からも
明らかなように、第一層及び第三層に繊維が混入
されて補強されている場合、製品の軽量石膏硬化
体に必要な曲げ強度はこの第一層及び第三層によ
り一応確保される。従つて、単に嵩比重と曲げ強
度の面からすれば、第二層に繊維を含有させなく
ても十分な特性が得られるが、第二層に繊維を含
有しない場合には、施工時に軽量石膏硬化体板を
切断した際などに、切断面がもろくなり易いとい
う欠点を有する。従つて、本発明においては、第
二層にも繊維を含有させる。 As is clear from the comparison of the results of Example 1 and Comparative Example 1 below, when the first and third layers are reinforced with fibers, the bending required for the lightweight gypsum cured product is The strength is temporarily ensured by the first and third layers. Therefore, from the standpoint of bulk specific gravity and bending strength, sufficient properties can be obtained without containing fibers in the second layer, but if the second layer does not contain fibers, lightweight plaster is used during construction. It has the disadvantage that the cut surface tends to become brittle when cutting the cured plate. Therefore, in the present invention, the second layer also contains fibers.
次に本発明の軽量石膏硬化体の製造方法につい
て説明する。 Next, a method for manufacturing a lightweight hardened gypsum body of the present invention will be explained.
本発明の方法においては、まず、型枠に第一層
用繊維混入半水石膏スラリーを流し込み。この場
合、型枠としては、第一層の表面を平滑とするた
め、プラスチツクスをコーテイングした底板、も
しくはプラスチツクシートを敷いた底板を有する
型枠を用いるのが有利である。 In the method of the present invention, first, a fiber-mixed gypsum hemihydrate slurry for the first layer is poured into a mold. In this case, in order to make the surface of the first layer smooth, it is advantageous to use a mold having a bottom plate coated with plastic or a bottom plate covered with a plastic sheet.
第一層用スラリーを流し込んだ後、引続き、第
二層用の気泡を多く含有する繊維混入半水石膏ス
ラリーを流し込む。第二層用のスラリーは、半水
石膏と水を主体とし、繊維及び適当な界面活性剤
を加え、気泡を導入して調製する。気泡の導入方
法は、プレフオーム法又はミツクスフオーム法の
いずれによつても良い。プレフオーム法は、ま
ず、水にアルキル硫酸ソーダ、アルキルベンゼン
スルホン酸ソーダ又はポリオキシエチレンアルキ
ル硫酸塩を起泡剤として半水石膏に対し0.02〜
2.0重量％添加し、強力に撹拌して発泡させる。
この際にPVA（ポリビニルアルコール）、MC（メ
チルセルローズ）などの高分子物質を半水石膏に
対し、0.05〜3.0重量％添加すると、安定した気
泡ができる。この発泡水と半水石膏とを混合して
スラリーとする。ミツクスフオーム法は、同様な
配合で材料を同時に投入し、強力に撹拌してスラ
リーとする。いずれの気泡導入法をとる場合で
も、水の量は半水石膏に対し40〜100重量％が好
適である。 After pouring the slurry for the first layer, a fiber-mixed hemihydrate gypsum slurry containing many air bubbles for the second layer is poured. The slurry for the second layer is prepared based on gypsum hemihydrate and water, adding fibers and a suitable surfactant, and introducing air bubbles. The method for introducing the bubbles may be either a preform method or a mixed foam method. In the preform method, first, add sodium alkyl sulfate, sodium alkylbenzene sulfonate, or polyoxyethylene alkyl sulfate to water as a foaming agent, and add 0.02~
Add 2.0% by weight and stir vigorously to foam.
At this time, if 0.05 to 3.0% by weight of a polymeric substance such as PVA (polyvinyl alcohol) or MC (methyl cellulose) is added to hemihydrate gypsum, stable bubbles can be created. This foamed water and hemihydrate gypsum are mixed to form a slurry. In the mixed foam method, materials are added at the same time in a similar manner and are vigorously stirred to form a slurry. Regardless of the bubble introduction method, the amount of water is preferably 40 to 100% by weight based on gypsum hemihydrate.
なお、第一層及び第二層の注型に際しては、弱
いバイブレータを短時間使用し、石膏スラリー表
面を平らにならすこともできる。しかし、強力に
あるいは長時間行うと泡が上方に上がるので好ま
しくない。 Note that when casting the first and second layers, a weak vibrator may be used for a short period of time to flatten the surface of the gypsum slurry. However, if it is done too forcefully or for a long time, the bubbles will rise upward, which is not preferable.
第二層が僅かにこわばつた時期に、第三層の半
水石膏スラリーを流し込み、プラスチツクシート
で覆い、その上からロールをかけることにより、
表面を平滑にする。 When the second layer was slightly stiff, the third layer of hemihydrate gypsum slurry was poured in, covered with a plastic sheet, and rolled over it.
Smooth the surface.
次いで硬化させ、全層の硬化後に脱型し、乾燥
することにより、本発明の軽量石膏硬化体が得ら
れる。 Next, the lightweight gypsum cured body of the present invention is obtained by curing, demolding after all layers have hardened, and drying.
なお、本発明において、用いる半水石膏はα
型、β型のいずれでも良い。 In addition, in the present invention, the hemihydrate gypsum used is α
Either type or β type may be used.
［作用］
本発明の軽量石膏硬化体は、繊維含有多泡質石
膏層の両表面を繊維含有緻密質石膏層で被覆した
構成とされており、可燃性ないし発煙性物質によ
る被覆がないので、石膏硬化体の耐火材としての
特徴が損なわれることがなく、同一嵩比重の多泡
質石膏のみの硬化体と比べ、曲げ強度が高く、し
かも表面が硬く平滑である。このため、そのまま
塗装あるいは壁紙等で仕上げることもでき、壁紙
の接着性も良好である。[Function] The lightweight hardened gypsum body of the present invention has a structure in which both surfaces of a fiber-containing multicellular gypsum layer are covered with a fiber-containing dense gypsum layer, and there is no coating with flammable or smoke-producing substances. The characteristics of the cured gypsum as a fireproof material are not impaired, and the bending strength is higher than that of a cured body of only cellular gypsum having the same bulk specific gravity, and the surface is hard and smooth. Therefore, it can be painted or finished with wallpaper, etc., and the adhesiveness of wallpaper is also good.
しかして、本発明の製造方法に従つて、前に流
し込んだ層が未だ完全に硬化しないうちに、次の
層の石膏スラリーを流し込むことにより、隣接す
る多泡質石膏層（第二層）と緻密質石膏層（第一
層又は第三層）との界面においては、二水石膏の
針状の結晶が一層から他層へと成長し合つて析出
するため、両層間の結合が極めて強固な軽量石膏
硬化体が容易に製造される。 According to the manufacturing method of the present invention, by pouring the gypsum slurry of the next layer before the previously poured layer has yet to completely harden, the adjacent porous gypsum layer (second layer) can be poured. At the interface with the dense gypsum layer (first layer or third layer), needle-shaped crystals of dihydrate gypsum grow and precipitate from one layer to the other, so the bond between the two layers is extremely strong. A lightweight gypsum cured body is easily produced.
［実施例］
以下、実施例及び比較例を挙げて本発明を更に
具体的に説明するが、本発明はその要旨を超えな
い限り、以下の実施例に限定されるものではな
い。[Examples] Hereinafter, the present invention will be described in more detail with reference to Examples and Comparative Examples, but the present invention is not limited to the following Examples unless it exceeds the gist thereof.
実施例 １
β−半水石膏100重量部に対し、水80重量部と
ガラス繊維１重量部をホバートミキサーにて混合
して、スラリーＡを調製した。別に、80重量部の
水にアニオン型界面活性剤を0.02重量部及び
PVAを0.1重量部加え、家庭用ミキサーにて
6000rpmで高速撹拌して起泡させ、これにβ−半
水石膏100重量部とガラス繊維１重量部を加えて
混合し、多泡質石膏スラリーＢを調製した。Example 1 Slurry A was prepared by mixing 100 parts by weight of β-hemihydrate gypsum, 80 parts by weight of water, and 1 part by weight of glass fibers using a Hobart mixer. Separately, add 0.02 parts by weight of an anionic surfactant to 80 parts by weight of water.
Add 0.1 part by weight of PVA and use a household mixer.
The mixture was stirred at high speed at 6000 rpm to foam, and 100 parts by weight of β-hemihydrate gypsum and 1 part by weight of glass fiber were added and mixed to prepare a multicellular gypsum slurry B.
４×４×16cmの型枠にスラリーＡを５mm厚さに
注入し、その上にスラリーＢを35mm厚さまで注入
し、更にスラリーＡを40mm厚さまで注入し、硬化
後脱型し、40℃で３日間通風乾燥して軽量石膏硬
化体を得た。 Slurry A was poured into a 4 x 4 x 16 cm mold to a thickness of 5 mm, slurry B was poured on top of it to a thickness of 35 mm, slurry A was poured to a thickness of 40 mm, and after curing, the mold was removed and heated at 40℃. A lightweight hardened gypsum body was obtained by ventilation drying for 3 days.
この軽量石膏硬化体の嵩比重は0.62で、曲げ強
度は39Kgｆ／cm2であつた。 This lightweight hardened gypsum body had a bulk specific gravity of 0.62 and a bending strength of 39 kgf/cm 2 .
実施例 ２
４×４×16cmの型枠に、実施例１で調製したス
ラリーＡを10mm厚さに注入し、その上に実施例１
で調製したスラリーＢを30mm厚さまで注入し、更
にその上にスラリーＡを40mm厚さまで注入し、硬
化後脱型し、40℃で３日間通風乾燥して軽量石膏
硬化体を得た。Example 2 Slurry A prepared in Example 1 was poured into a 4 x 4 x 16 cm mold to a thickness of 10 mm, and Example 1 was poured onto it.
Slurry B prepared above was injected to a thickness of 30 mm, and slurry A was further injected onto it to a thickness of 40 mm, and after curing, the mold was demolded and dried with ventilation at 40°C for 3 days to obtain a lightweight gypsum cured body.
この軽量石膏硬化体の嵩比重は0.76で、曲げ強
度は46Kgｆ／cm2であつた。 This lightweight hardened gypsum body had a bulk specific gravity of 0.76 and a bending strength of 46 kgf/cm 2 .
比較例 １
80重量部の水にアニオン型界面活性剤を0.02重
量部及びPVAを0.1重量部加え、家庭用ミキサー
にて6000rpmで高速撹拌して起泡させ、これにβ
−半水石膏100重量部を加えて混合し、多泡質石
膏スラリーＣを調製した。Comparative Example 1 0.02 parts by weight of an anionic surfactant and 0.1 parts by weight of PVA were added to 80 parts by weight of water, stirred at high speed at 6000 rpm with a household mixer to foam, and added β
- 100 parts by weight of gypsum hemihydrate was added and mixed to prepare a multicellular gypsum slurry C.
４×４×16cmの型枠に、実施例１で調製したス
ラリーＡを５mm厚さに注入し、その上にスラリー
Ｃを35mm厚さまで注入し、更にスラリーＡを40mm
厚さまで注入し、硬化後脱型し、40℃で３日間通
風乾燥して軽量石膏硬化体を得た。 Into a 4 x 4 x 16 cm mold, slurry A prepared in Example 1 was poured to a thickness of 5 mm, slurry C was poured on top of it to a thickness of 35 mm, and slurry A was poured to a thickness of 40 mm.
The mixture was injected to a thickness, removed from the mold after hardening, and dried with ventilation at 40°C for 3 days to obtain a lightweight hardened gypsum body.
この軽量石膏硬化体の嵩比重は0.64で、曲げ強
度は34Kgｆ／cm2であつた。 This lightweight hardened gypsum body had a bulk specific gravity of 0.64 and a bending strength of 34 Kgf/cm 2 .
比較例 ２
β−半水石膏100重量部に対し水80重量部をホ
バートミキサーにて混合して、スラリーＤを調製
した。４×４×16cmの型枠に、スラリーＤを５mm
厚さに注入し、その上に比較例１で調製したスラ
リーＣを35mm厚さまで注入し、更にスラリーＤを
40mm厚さまで注入し、硬化後脱型し、40℃で３日
間通風乾燥して軽量石膏硬化体を得た。Comparative Example 2 Slurry D was prepared by mixing 80 parts by weight of water with 100 parts by weight of β-hemihydrate gypsum using a Hobart mixer. Add 5mm of slurry D to a 4x4x16cm formwork.
On top of that, slurry C prepared in Comparative Example 1 was poured to a thickness of 35 mm, and slurry D was poured on top of it to a thickness of 35 mm.
It was injected to a thickness of 40 mm, removed from the mold after curing, and dried with ventilation at 40°C for 3 days to obtain a lightweight hardened gypsum body.
この軽量石膏硬化体の嵩比重は0.65で、曲げ強
度は25Kgｆ／cm2であつた。 This lightweight hardened gypsum body had a bulk specific gravity of 0.65 and a bending strength of 25 kgf/cm 2 .
実施例 ３
６×40×60cmの型枠に、実施例１で調製したス
ラリーＡを５mm厚さに注入し、その上に実施例１
で調製したスラリーＢを55mmの厚さまで注入し、
更にその上にスラリーＡを60mm厚さまで注入し、
硬化後脱型し、100℃で６日間乾燥して軽量石膏
硬化体を得た。Example 3 Slurry A prepared in Example 1 was poured into a 6 x 40 x 60 cm mold to a thickness of 5 mm, and Example 1 was poured onto it.
Pour slurry B prepared in step 1 to a thickness of 55 mm.
Furthermore, slurry A was injected on top of it to a thickness of 60 mm.
After curing, the mold was removed and dried at 100°C for 6 days to obtain a lightweight hardened gypsum body.
この軽量石膏硬化体の表面は硬く、平滑であ
り、壁紙接着性は極めて良好であつた。 The surface of this lightweight cured gypsum body was hard and smooth, and the wallpaper adhesiveness was extremely good.
以上の結果から、本発明の軽量石膏硬化体は、
第一層第二層及び第三層に含有される繊維の補強
効果により、曲げ強度が著しく増大し、しかも、
その表面は硬く平滑となることが明らかである。 From the above results, the lightweight gypsum hardened body of the present invention is
Due to the reinforcing effect of the fibers contained in the first layer, second layer, and third layer, the bending strength increases significantly, and
It is clear that the surface will be hard and smooth.
［発明の効果］
以上詳述した通り、本発明の軽量石膏硬化体
は、繊維含有多泡質石膏層とこれをはさむ全層厚
の10〜50％量の繊維含有緻密質石膏層とからなる
ものであつて、
曲げ強度が著しく高く、機械的特性に優れ
る。[Effects of the Invention] As detailed above, the lightweight hardened gypsum body of the present invention consists of a fiber-containing porous gypsum layer and a fiber-containing dense gypsum layer sandwiching this layer in an amount of 10 to 50% of the total layer thickness. It has extremely high bending strength and excellent mechanical properties.
表面が硬く、平滑である。 The surface is hard and smooth.
このため加工性に優れると共に、塗装、壁紙
仕上げも良好に行うことができる。 Therefore, it has excellent workability and can be applied well to painting and wallpaper finishing.
可燃性ないし発煙性物質の被覆がないため、
石膏の耐火性能が損なわれることがない。 Because there is no coating of flammable or smoke-producing substances,
The fire resistance performance of plaster is not impaired.
等の優れた特徴を有し、耐火建材等として極めて
有用である。It has excellent characteristics such as, and is extremely useful as a fire-resistant building material.
しかして、このような本発明の軽量石膏硬化体
は、型枠に繊維混入半水石膏スラリーを流し込
み、その上に気泡を多量に混入した繊維混入半水
石膏スラリーを流し込み、更にその上に繊維混入
半水石膏スラリーを流し込んで硬化、乾燥させる
ことを特徴とする本発明の製造方法により、優れ
た層間密着性のもとに、容易かつ効率的に製造さ
れる。 Therefore, such a lightweight gypsum hardened body of the present invention can be obtained by pouring a fiber-mixed hemihydrate gypsum slurry into a mold, pouring a fiber-mixed hemihydrate gypsum slurry with a large amount of air bubbles mixed therein, and then pouring a fiber-mixed hemihydrate gypsum slurry into a mold, and then pouring a fiber-mixed hemihydrate gypsum slurry into a formwork, and then pouring a fiber-mixed hemihydrate gypsum slurry into which a large amount of air bubbles have been mixed. By the manufacturing method of the present invention, which is characterized by pouring mixed gypsum hemihydrate slurry, hardening and drying, it can be easily and efficiently manufactured with excellent interlayer adhesion.
Claims (1)
さが全層厚の10〜50％量の繊維含有緻密質石膏層
とからなることを特徴とする軽量石膏硬化体。 ２ 繊維含有緻密質石膏層は、半水石膏原料に対
して0.5〜５重量部の繊維を含有することを特徴
とする特許請求の範囲第１項に記載の硬化体。 ３ 型枠に繊維混入半水石膏スラリーを流し込
み、その上に、アルキル硫酸ソーダ、アルキルベ
ンゼンスルホン酸ソーダ又はポリオキシエチレン
アルキル硫酸塩を半水石膏に対し0.02〜2.0重量
％添加して撹拌することにより、気泡を多量に混
入した繊維混入半水石膏スラリーを流し込み、更
にその上に繊維混入半水石膏スラリーを流し込ん
で硬化、乾燥させることを特徴とする軽量石膏硬
化体の製造方法。[Scope of Claims] 1. A lightweight hardened gypsum body comprising a fiber-containing porous gypsum layer and a fiber-containing dense gypsum layer sandwiching these layers with a total thickness of 10 to 50% of the total layer thickness. . 2. The cured product according to claim 1, wherein the fiber-containing dense gypsum layer contains 0.5 to 5 parts by weight of fibers based on the hemihydrate gypsum raw material. 3. Pour the fiber-mixed gypsum hemihydrate slurry into the mold, add 0.02 to 2.0% by weight of sodium alkyl sulfate, sodium alkylbenzenesulfonate, or polyoxyethylene alkyl sulfate to the gypsum hemihydrate, and stir. A method for producing a lightweight hardened gypsum body, characterized by pouring a fiber-mixed hemihydrate gypsum slurry containing a large amount of air bubbles, and then pouring a fiber-mixed hemihydrate gypsum slurry on top of the slurry, followed by hardening and drying.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP31462586A JPS63162233A (en) | 1986-12-25 | 1986-12-25 | Light-weight gypsum cured body and manufacture thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP31462586A JPS63162233A (en) | 1986-12-25 | 1986-12-25 | Light-weight gypsum cured body and manufacture thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63162233A JPS63162233A (en) | 1988-07-05 |
| JPH0451346B2 true JPH0451346B2 (en) | 1992-08-18 |
Family
ID=18055561
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP31462586A Granted JPS63162233A (en) | 1986-12-25 | 1986-12-25 | Light-weight gypsum cured body and manufacture thereof |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS63162233A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0874358A (en) * | 1994-09-02 | 1996-03-19 | Yoshino Sekko Kk | Partition wall |
| PT3559365T (en) * | 2016-12-20 | 2022-01-06 | Knauf Gips Kg | Gypsum plasterboard |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5079512A (en) * | 1973-11-12 | 1975-06-28 | ||
| JPS5215130A (en) * | 1975-07-28 | 1977-02-04 | Asahi Chemical Ind | Incombustible panel |
| JPS5392832A (en) * | 1976-12-21 | 1978-08-15 | Ugine Kuhlmann | Manufacture of composite building material |
| JPS56165092A (en) * | 1980-05-20 | 1981-12-18 | Ibigawa Electric Ind Co Ltd | Method and apparatus for producing ligh weight high strength inorganic fiberboard |
-
1986
- 1986-12-25 JP JP31462586A patent/JPS63162233A/en active Granted
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5079512A (en) * | 1973-11-12 | 1975-06-28 | ||
| JPS5215130A (en) * | 1975-07-28 | 1977-02-04 | Asahi Chemical Ind | Incombustible panel |
| JPS5392832A (en) * | 1976-12-21 | 1978-08-15 | Ugine Kuhlmann | Manufacture of composite building material |
| JPS56165092A (en) * | 1980-05-20 | 1981-12-18 | Ibigawa Electric Ind Co Ltd | Method and apparatus for producing ligh weight high strength inorganic fiberboard |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS63162233A (en) | 1988-07-05 |
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