JPH0158140B2 - - Google Patents
Info
- Publication number
- JPH0158140B2 JPH0158140B2 JP9213481A JP9213481A JPH0158140B2 JP H0158140 B2 JPH0158140 B2 JP H0158140B2 JP 9213481 A JP9213481 A JP 9213481A JP 9213481 A JP9213481 A JP 9213481A JP H0158140 B2 JPH0158140 B2 JP H0158140B2
- Authority
- JP
- Japan
- Prior art keywords
- methylcellulose
- polyacrylamide
- extrusion molding
- present
- cement
- 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
Links
- 238000001125 extrusion Methods 0.000 claims description 15
- 239000000463 material Substances 0.000 claims description 15
- 229920000609 methyl cellulose Polymers 0.000 claims description 13
- 239000001923 methylcellulose Substances 0.000 claims description 13
- 229920002401 polyacrylamide Polymers 0.000 claims description 13
- 239000000203 mixture Substances 0.000 claims description 10
- 239000004568 cement Substances 0.000 claims description 7
- 239000000654 additive Substances 0.000 description 6
- 239000000835 fiber Substances 0.000 description 4
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 108010010803 Gelatin Proteins 0.000 description 2
- 229920003171 Poly (ethylene oxide) Polymers 0.000 description 2
- 239000004372 Polyvinyl alcohol Substances 0.000 description 2
- 239000000783 alginic acid Substances 0.000 description 2
- 235000010443 alginic acid Nutrition 0.000 description 2
- 229920000615 alginic acid Polymers 0.000 description 2
- 229960001126 alginic acid Drugs 0.000 description 2
- 150000004781 alginic acids Chemical class 0.000 description 2
- 239000010425 asbestos Substances 0.000 description 2
- 229920000159 gelatin Polymers 0.000 description 2
- 239000008273 gelatin Substances 0.000 description 2
- 235000019322 gelatine Nutrition 0.000 description 2
- 235000011852 gelatine desserts Nutrition 0.000 description 2
- 230000014759 maintenance of location Effects 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- -1 polypropylene Polymers 0.000 description 2
- 229920002451 polyvinyl alcohol Polymers 0.000 description 2
- 229910052895 riebeckite Inorganic materials 0.000 description 2
- 238000007711 solidification Methods 0.000 description 2
- 230000008023 solidification Effects 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 229920002134 Carboxymethyl cellulose Polymers 0.000 description 1
- 239000004743 Polypropylene Substances 0.000 description 1
- 239000011398 Portland cement Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 239000011400 blast furnace cement Substances 0.000 description 1
- 239000001768 carboxy methyl cellulose Substances 0.000 description 1
- 235000010948 carboxy methyl cellulose Nutrition 0.000 description 1
- 239000008112 carboxymethyl-cellulose Substances 0.000 description 1
- 229920002678 cellulose Polymers 0.000 description 1
- 239000001913 cellulose Substances 0.000 description 1
- 230000002301 combined effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000009408 flooring Methods 0.000 description 1
- 239000010881 fly ash Substances 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 239000003365 glass fiber Substances 0.000 description 1
- 239000012784 inorganic fiber Substances 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 229920001778 nylon Polymers 0.000 description 1
- 239000010451 perlite Substances 0.000 description 1
- 235000019362 perlite Nutrition 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 239000004014 plasticizer Substances 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 239000010455 vermiculite Substances 0.000 description 1
- 235000019354 vermiculite Nutrition 0.000 description 1
- 229910052902 vermiculite Inorganic materials 0.000 description 1
Description
本発明はセメント質材料を主成分とする押出成
形用セメント組成物に関する。
更に詳しくは、セメント質材料を主成分とする
水混練物を押出成形する場合に好適な添加剤が特
殊な配合で加えられている押出成形用セメント組
成物に関するものである。
セメント質材料を主成物とする水混練物を、所
望の形状のダイスを用いてセメント板体、石綿セ
メント板体等が押出成形され、建築物の外壁材、
屋根材、床材等に用いられている。そしてこれら
板体は、その成形法の特殊性を利用して多数の貫
通孔を持つ形状とか、両側端部が本実形状のもの
が選ばれ、断熱性、防音性、簡易な施工性、など
の特徴を発揮している。
しかし、セメント質材料の水混練物はそのまま
では押出成形しても、凝結固化するまでの間の保
形性、保水性が低いため、凝固後はダイス形状に
合つていない成形品になつてしまうことが多い。
また、セメント質材料のみの水混練物では押出機
のシリンダ、ダイス内の滑りが悪く、粘着性が高
く、したがつてモーターのメルクも大きいばかり
か、ダイス出口の離型性もわるいため、均質で且
つ表面平滑な成形品は得られない。これらの現象
は石綿、ガラス繊維等の無機質繊維、ナイロン繊
維、ポリプロピレン繊維等の有機質繊維等が混在
している場合でも同じである。
従来これらの問題の解決にはメチルセルロー
ズ、ハイドロエチルセルローズ、カルボキシメチ
ルセルローズ、ポリビニルアルコール、ポリエチ
レンオキサイド、ポリアクリルアミド、ゼラチ
ン、アルギン酸等の添加剤がそれぞれ単独で用い
られかなりの効果を上げている。
これらの添加剤の中で、ポリエチレンオキサイ
ド、ポリアクリルアミド、ゼラチン、アルギン酸
等の如き洩糸性を有する添加剤はセメント−水混
練物に弾性を与えるため、押出成形時のダイス出
口における成形体が弾性膨脹し、所望の断面形状
のものができないという欠点を有しているが、ポ
リアクリルアミドの場合のごときは潤滑性、滑り
性に秀れ、添加剤として特異な効果が期待され
る。一方メチルセルローズ、ハイドロエチルセル
ローズの如きセルローズ誘導体とかポリビニルア
ルコールは保水性に秀れ、特にメチルセルローズ
はセメント系材料の押出成形に可塑化剤として広
く用いられている。しかもこれらはポリアクリル
アミドの如き洩糸性がなく、セメント−水混練物
に弾性を与えない。しかしながらメチルセルロー
ズ等の場合には粘着性が大き過ぎ、滑り性、離形
性に劣り、押出速度が小さいという欠点がある。
本発明者等はこれら諸問題点の解決について
種々検討した結果、メチルセルローズとポリアク
リルアミドを併用することにより、そしてこの併
用の比率を限定された範囲に置くことにより、従
来、その両者がそれぞれ単独の場合は持つていた
欠点を著しく改善すること、即ち押出成形時の弾
性変形性をなくすることに成功するとともに押出
機シリンダ内での潤滑性、滑り性を良くして押出
速度を上げ、一方、押出成形時の保形性をも向上
することができ、本発明を完成した。
以下本発明を詳しく説明する。
本発明に用いられるセメント質材料は普通ポル
トランドセメントの他、高炉セメント、フライア
ツシユセメントでもよい。
また、補強のための前記各種繊維の添加は本願
発明の効果を何ら阻害しない。添加物としてはこ
れら繊維類の他にパーライト、バーミキユライト
等の軽量骨材、硅砂等を用いてもよい。
メチルセルローズとしては、特に限定されるも
のではなく市販のものが好適に用いられるがポリ
アクリルアミドは前記併用効果を出すためには分
子量300万〜1400万、0.1重量％水溶液の粘度が10
〜1000cpsのものが併用されるが、好ましくは分
子量500〜1000万、粘度10〜500cpsのものが選ば
れる。
また、メチルセルローズとポリアクリルアミド
の配合割合重量は１：0.1〜１：２が好適でこの
範囲外になると、単独使用の場合の前記諸欠点が
出てきて好ましくない。
更に、メチルセルローズとポリアクリルアミド
の合計量とセメント質材料との使用比率は押出速
度、ダイス形状等により種々選ばれるため、本発
明においては特に限定されるものではないが、通
常は前者0.5〜２重量部を後者100重量部に含有さ
せたものが好ましく用いられる。
以上本発明を詳しく説明したが本発明の要旨
は、セメント質材料とメチルセルローズとポリア
クリルアミドとを含有し、メチルセルローズとポ
リアクリルアミドとの重量比が１：0.1〜１：２
である押出成形用セメント組成物にある。
次に、本発明を実施例を用いて説明する。
表１に示す配合組成の原料を混合して水混練物
をつくり、100mmφのシリンダを持つ真空押出成
形機と、その先端にとりつけた15mm×200mmのほ
ぼ長方形で両側端が本実形状となつているダイス
を通して押出成形した。その結果は第２表に示し
た。
The present invention relates to a cement composition for extrusion molding, the main component of which is a cementitious material. More specifically, the present invention relates to a cement composition for extrusion molding, in which additives suitable for extrusion molding of a water-kneaded material containing a cementitious material as a main component are added in a special formulation. A water-kneaded product mainly composed of cementitious material is extruded into cement plates, asbestos cement plates, etc. using a die of a desired shape, and is used as an exterior wall material for buildings.
Used for roofing materials, flooring materials, etc. Utilizing the special characteristics of the molding method, these plates are selected to have a shape with many through holes, or have a real shape on both sides, and have good heat insulation, soundproofing, easy construction, etc. It exhibits the characteristics of However, even if a water-kneaded cementitious material is extruded as is, it has poor shape retention and water retention until solidification, resulting in a molded product that does not fit the die shape after solidification. I often put it away.
In addition, water-kneaded mixtures of only cementitious materials have poor slippage in the cylinder and die of the extruder and are highly sticky, resulting in a large amount of melt on the motor. However, a molded product with a smooth surface cannot be obtained. These phenomena are the same even when asbestos, inorganic fibers such as glass fibers, organic fibers such as nylon fibers, polypropylene fibers, etc. are mixed. Conventionally, additives such as methylcellulose, hydroethylcellulose, carboxymethylcellulose, polyvinyl alcohol, polyethylene oxide, polyacrylamide, gelatin, and alginic acid have been used individually to solve these problems, and these have been highly effective. Among these additives, additives with leaking properties such as polyethylene oxide, polyacrylamide, gelatin, and alginic acid give elasticity to the cement-water mixture, so that the molded product at the exit of the die during extrusion molding is elastic. Although it has the disadvantage that it expands and cannot be formed into a desired cross-sectional shape, polyacrylamide has excellent lubricity and slipping properties, and is expected to have unique effects as an additive. On the other hand, cellulose derivatives such as methylcellulose and hydroethylcellulose and polyvinyl alcohol have excellent water retention properties, and methylcellulose in particular is widely used as a plasticizer in extrusion molding of cementitious materials. In addition, these materials do not have leaky properties like polyacrylamide, and do not impart elasticity to the cement-water mixture. However, in the case of methylcellulose, etc., there are drawbacks such as excessive tackiness, poor slipperiness and mold release properties, and low extrusion speed. As a result of various studies on how to solve these problems, the present inventors found that by using methylcellulose and polyacrylamide together, and by keeping the ratio of this combination within a limited range, it was possible to In this case, we succeeded in significantly improving the drawbacks that existed in the case of extrusion molding, that is, we succeeded in eliminating the elastic deformability during extrusion molding, improved the lubricity and slipperiness within the extruder cylinder, and increased the extrusion speed. The present invention was completed by improving the shape retention during extrusion molding. The present invention will be explained in detail below. The cementitious material used in the present invention may be ordinary Portland cement, blast furnace cement, or fly ash cement. Moreover, the addition of the aforementioned various fibers for reinforcement does not impede the effects of the present invention in any way. In addition to these fibers, lightweight aggregates such as perlite and vermiculite, silica sand, etc. may be used as additives. Methylcellulose is not particularly limited, and commercially available products are preferably used; however, polyacrylamide must have a molecular weight of 3 million to 14 million and a viscosity of 10% by weight of a 0.1% aqueous solution in order to achieve the above-mentioned combined effect.
~1000 cps is used in combination, but preferably one with a molecular weight of 5 to 10 million and a viscosity of 10 to 500 cps is selected. Further, the mixing ratio weight of methylcellulose and polyacrylamide is preferably 1:0.1 to 1:2, and if it is outside this range, the above-mentioned disadvantages will occur when used alone, which is not preferable. Further, the ratio of the total amount of methylcellulose and polyacrylamide to the cementitious material used is variously selected depending on the extrusion speed, die shape, etc., and is not particularly limited in the present invention, but the former is usually 0.5 to 2. The latter is preferably used in a proportion of 100 parts by weight. The present invention has been described in detail above, but the gist of the present invention is that the present invention contains a cementitious material, methylcellulose, and polyacrylamide, and the weight ratio of methylcellulose and polyacrylamide is 1:0.1 to 1:2.
A cement composition for extrusion molding. Next, the present invention will be explained using examples. A water-kneaded product was made by mixing the raw materials with the composition shown in Table 1, and the mixture was molded using a vacuum extrusion molding machine with a 100 mmφ cylinder and a 15 mm x 200 mm approximately rectangular shape with real shapes at both ends attached to the tip of the vacuum extrusion molding machine. It was extruded through a die. The results are shown in Table 2.
【表】【table】
【表】
以上の結果からわかるごとく物性には影響はな
いがメチルセルローズ、ポリアクリルアミドの単
独使用と併用の場合により、成形性（外観、成形
速度）に大きく差が現われることがわかる。[Table] As can be seen from the above results, there is no effect on physical properties, but there is a large difference in moldability (appearance, molding speed) depending on whether methylcellulose or polyacrylamide is used alone or in combination.
Claims (1)
クリルアミドとを含有し、メチルセルローズとポ
リアクリルアミドとの重量比が１：0.1〜１：２
であることを特徴とする押出成形用セメント組成
物。1 Contains a cementitious material, methylcellulose, and polyacrylamide, and the weight ratio of methylcellulose and polyacrylamide is 1:0.1 to 1:2.
A cement composition for extrusion molding, characterized in that:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9213481A JPS57209866A (en) | 1981-06-17 | 1981-06-17 | Cement composition for extrusion formation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9213481A JPS57209866A (en) | 1981-06-17 | 1981-06-17 | Cement composition for extrusion formation |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS57209866A JPS57209866A (en) | 1982-12-23 |
| JPH0158140B2 true JPH0158140B2 (en) | 1989-12-08 |
Family
ID=14045956
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9213481A Granted JPS57209866A (en) | 1981-06-17 | 1981-06-17 | Cement composition for extrusion formation |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS57209866A (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS616163A (en) * | 1984-06-20 | 1986-01-11 | 日曹マスタ−ビルダ−ズ株式会社 | Method of decreasing fluidity reduction of cement composition |
| JP2635884B2 (en) * | 1991-06-25 | 1997-07-30 | 日本国土開発株式会社 | Concrete composition |
| US6084011A (en) * | 1997-08-29 | 2000-07-04 | Lucero; Richard F. | Freeze/thaw resistant cementitious adhesive for composite materials and method for production thereof |
-
1981
- 1981-06-17 JP JP9213481A patent/JPS57209866A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS57209866A (en) | 1982-12-23 |
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