JPWO2005003055A1 - Cement-based extrusion molding composition - Google Patents

Abstract

The cement-based extrusion molding composition is represented by the general formula [1] and 15 to 45% by weight of water in 100% by weight of a composition comprising a hydraulic substance, an extrusion aid, aggregate and fiber. A polyoxyalkylene derivative having a 1% aqueous solution cloud point of 40 ° C. or higher is added in an amount of 0.01 to 2.0% by weight. (Z is a residue of a compound containing 2 to 8 hydroxyl groups, R 1 and R 2 are hydrogen atoms and hydrocarbon groups having 1 to 18 carbon atoms, A 1 O is an oxyalkylene group having 2 carbon atoms, and A 2 O is It is an oxyalkylene group having 3 to 8 carbon atoms, and oxyalkylene of A1O and A2O may be random or block, a + b + c + d is 1 to 300, a + c: b + d = 99: 1 to 2: 8, and l + m = 2 to 8.)

Description

  The present invention relates to a cement-based extrusion composition containing a specific polyoxyalkylene derivative and a cement product obtained by curing the extrusion-molded product.

Conventionally, cellulose additives such as methyl cellulose and hydroxymethyl cellulose, synthetic polymer compounds such as polyethylene oxide, polyacrylamide, and polyvinyl alcohol are known as additives for extrusion-molded cement products. However, among these, cellulose derivatives are excellent in water retention and can suppress the dehydration phenomenon during extrusion, but are too sticky, so the raw material mixer is heavily loaded and the raw material temperature rises. The gelation temperature is exceeded and the performance of the cellulose derivative cannot be fully expressed. Alternatively, the slipperiness and releasability of the cellulose derivative itself cannot be said to be sufficient, increasing the screw torque or reducing the appearance of the molded product. In addition, due to its strong water retention, it has been very difficult to re-absorb water that has been removed after discharging the die and easily swell in the width direction and thickness direction, and to produce a product with a smooth surface. On the other hand, although synthetic polymer compounds such as polyethylene oxide are excellent in slipperiness, they do not have sufficient water retention. For this reason, when extruding a cement-based water kneaded product, water is separated by the extrusion pressure applied to the die, resulting in extrusion. There have been problems such as inability to mold, cracks after molding, and poor appearance.
In order to solve these problems, a synthetic polymer is used in combination with a cellulose derivative (for example, JP-A Nos. 6-100347 and 8-225355), or a polyurethane resin is used as the synthetic polymer. (For example, JP-A-6-191914 and JP-A-7-309653) have been attempted. By using these additives, water retention, slipperiness and appearance of the molded product are improved. However, in recent years, extrusion-molded cement products have been required to have high strength, and this has been dealt with by reducing the amount of water in the whole, but when the amount of water is reduced, these additives are added. Even when used, problems have been pointed out that the load at the time of kneading is large and workability is lowered, molding defects due to the large particle size of the material after kneading, and swelling of the molded product occurs.
In JP-A-7-314418, a composition for extrusion molding is produced by blending cement, aggregate, extrusion aid, and water. In this composition, a polyalkylene glycol derivative is added in an amount of 0.05 to 0.3% by weight with respect to 100 parts by weight of the composition.

（ただし、Ｚは２〜８個の水酸基含有化合物の残基、Ｒ^１、Ｒ^２は水素原子、炭素数１〜１８の炭化水素基であり、Ａ^１Ｏは炭素数２のオキシアルキレン基であり、Ａ^２Ｏ炭素数３〜８のオキシアルキレン基であり、Ａ^１Ｏ、Ａ^２Ｏのオキシアルキレン基はランダム状でもブロック状でもよく、ａ＋ｂ＋ｃ＋ｄは１〜３００であり、ａ＋ｃ：ｂ＋ｄ＝９９：１〜２：８であり、ｌ＋ｍ＝２〜８である。）
好適な実施形態においては、一般式〔１〕で表されるポリオキシアルキレン誘導体において、Ｚが２個の水酸基含有化合物の残基であり、Ｒ^１、Ｒ^２の炭素数の和が１〜８であり、Ａ^２Ｏが炭素数３〜４のオキシアルキレン基であり、ｌ＝１、ｍ＝１である。
また好適な実施形態においては、前記配合物１００重量％に加える水の量が外割で１５〜２５重量％である。
また好適な実施形態においては、水硬性物質、骨材、繊維および押出助剤を最初に混合させ、つづいて水の一部を添加し混合させ、混練状態になってから、ポリオキシアルキレン誘導体および水の一部を添加して混練することによって、セメント系押出成形用組成物を得る。
また、本発明は、前記組成物の押出成形物を硬化させてなるセメント製品である。However, in the technique described in JP-A-7-314418, it has been found that molding defects due to a large material particle size after kneading and swelling of a molded product are not necessarily improved sufficiently.
The present invention relates to a cement-based extrusion molding composition that reduces the load during kneading of an extrusion molding material and makes the molding easy by reducing the material particle size after kneading the extrusion molding material, and a molded article. It was made for the purpose of providing a cement product having no swell and excellent in dimensional stability.
That is, the present invention relates to a polyoxyalkylene represented by the following general formula [1] in which 100% by weight of a composition comprising a hydraulic substance, an aggregate, an extrusion aid and fiber is added to 15 to 45% by weight of water. A cement-based extrusion molding composition comprising a polyoxyalkylene derivative, which is a derivative and has a cloud point of 1% aqueous solution of 40 ° C. or more, added in an external ratio of 0.01 to 2.0% by weight.

(However, Z is a residue of 2 to 8 hydroxyl group-containing compounds, R ¹ and R ² are hydrogen atoms and hydrocarbon groups having 1 to 18 carbon atoms, and A ¹ O is an oxyalkylene group having 2 carbon atoms. A ² O is an oxyalkylene group having 3 to 8 carbon atoms, the oxyalkylene group of A ¹ O and A ² O may be random or block, a + b + c + d is 1 to 300, and a + c: b + d = 99 : 1-2: 8, and l + m = 2-8.)
In a preferred embodiment, in the polyoxyalkylene derivative represented by the general formula [1], Z is a residue of two hydroxyl group-containing compounds, and the sum of the carbon numbers of R ¹ and R ² is 1-8. A ² O is an oxyalkylene group having 3 to 4 carbon atoms, and l = 1 and m = 1.
In a preferred embodiment, the amount of water added to 100% by weight of the formulation is 15-25% by weight.
In a preferred embodiment, the hydraulic substance, the aggregate, the fiber, and the extrusion aid are first mixed, then a part of water is added and mixed, and after kneading, the polyoxyalkylene derivative and A cement-based extrusion molding composition is obtained by adding a part of water and kneading.
Moreover, this invention is a cement product formed by hardening the extrusion molding of the said composition.

  FIG. 1 is a chart showing an example of the mixer current value.

The cement-based extrusion molding composition of the present invention contains a polyoxyalkylene derivative represented by the general formula [1] as an essential component.
2 to 8 hydroxyl group-containing compounds represented by Z in the formula [1] are glycols such as ethylene glycol, propylene glycol, butylene glycol, hexylene glycol, styrene glycol, alkylene glycol having 8 to 18 carbon atoms, and neopentyl glycol. Glycerin, diglycerin, polyglycerin (trimer to hexamer), trimethylolethane, trimethylolpropane, 1,3,5-pentanetriol, erythritol, pentaerythritol, dipentaerythritol, sorbitol, sorbitan, sorbide , Sorbitol and glycerin condensates, polyhydric alcohols such as adonitol, arabitol, xylitol, mannitol, or partially etherified or esterified products thereof, xylose, arabinose, ribo , Sugars such as rhamnose, glycose, fructose, galactose, mannose, sorbose, cellobiose, maltose, isomaltose, trehalose, sucrose, raffinose, gentianose, melezitose, or their partially etherified products or There is an esterified product. Preferred are glycols having 2 to 4 carbon atoms and polyhydric alcohols, and more preferred are residues of 2 to 4 carbon atoms and two hydroxyl group-containing compounds.
Examples of the hydrocarbon group having 1 to 18 carbon atoms represented by R ¹ and R ² in the formula [1] include a methyl group, an ethyl group, a propyl group, an isopropyl group, a butyl group, an isobutyl group, a second butyl group, and a third group. Butyl, pentyl, isopentyl, neopentyl, hexyl, heptyl, octyl, nonyl, decyl, undecyl, dodecyl, isotridecyl, tetradecyl, hexadecyl, isocetyl, octadecyl, stearyl Aliphatic saturated hydrocarbon groups such as isostearyl group; aliphatic unsaturated hydrocarbon groups such as allyl group and oleyl group; alicyclic saturated hydrocarbon groups such as cyclohexyl group and methylcyclohexyl group; cyclopentenyl group, cyclohexenyl Alicyclic unsaturated hydrocarbon group such as a group; phenyl group, benzyl group, cresyl group, butylphenyl group, di There are aromatic hydrocarbon groups or substituted aromatic hydrocarbon groups such as tilphenyl group, octylphenyl group, nonylphenyl group, dodecylphenyl group, dioctylphenyl group, dinonylphenyl group and α-methylbenzylphenyl group. One kind or a mixture of two or more kinds may be used. Preferably a hydrogen atom, a hydrocarbon group having 1 to 8 carbon atoms, more preferably sum of carbon numbers of ^R 1, ^{R 2} is 1-8. When the number of carbon atoms of the hydrocarbon group represented by R ¹ or R ² exceeds 18, the hydrophilicity becomes insufficient, such being undesirable.
The oxyalkylene group having 2 carbon atoms represented by A ¹ O in the formula [1] includes an oxyethylene group. Examples of the oxyalkylene group having 3 to 8 carbon atoms represented by A ² O in the formula [1] include an oxypropylene group, an oxytrimethylene group, a 1,2-oxybutylene group, a 1,3-oxybutylene group, There are a 2,3-oxybutylene group, an oxytetramethylene group, an oxystyrene group, and the like, and an oxyalkylene group having 3 to 4 carbon atoms is particularly preferable. Two or more types of oxyalkylene groups represented by A ¹ O and A ² O may be bonded together in any block or random manner.
In the formula [1], a, c and b, d are average added moles of oxyalkylene groups represented by A ¹ O and A ² O, respectively, and a + b + c + d is 1 to 300. If a + b + c + d exceeds 300, the resulting compound has a high viscosity, which makes it difficult to produce. Further, a + c: b + d = 99: 1 to 2: 8, preferably a + c: b + d = 99: 1 to 3: 7. When a + c: b + d is more than 99: 1, the effect of the present invention cannot be obtained. When a + c: b + d is less than 2: 8, a + c is not preferable because the resulting compound is difficult to dissolve in water. Also, l + m = 2-8. Moreover, as a weight average molecular weight of the polyoxyalkylene derivative shown by Formula [1], 100-50,000 are preferable, More preferably, it is 500-20,000.
The clouding point of 1% aqueous solution of the polyoxyalkylene derivative represented by the general formula [1], which is an essential component of the present invention, is 40 ° C. or higher. When the value of the 1% aqueous solution cloud point is lower than 40 ° C., the polyoxyalkylene derivative acts as an antifoaming agent or does not dissolve in water, and the effect of the present invention is obtained. This is because there is not.
The cement-based extrusion molding composition of the present invention contains a hydraulic substance as an essential component. As hydraulic materials, Portland cements such as ordinary, early strength, medium-ripening, belite, etc., mixed cements containing mineral powders such as blast furnace slag, fly ash, silica fume and limestone, alumina cements, etc. And gypsum.
The cement-based extrusion molding composition of the present invention contains an aggregate as an essential component. Examples of aggregates include river sand, cinnabar sand, meteorite powder, lightweight aggregate, wollastonite, mica, and pozzolana.
The cement-based extrusion molding composition of the present invention contains fibers as an essential component. Examples of the fibers include inorganic fibers such as glass fibers and carbon fibers, and pulp, waste paper, polyamide fibers, polyester fibers, polypropylene fibers, and organic fibers such as vinylon fibers.
The cement-based extrusion molding composition of the present invention contains an extrusion aid as an essential component. Extrusion aids include cellulose derivatives such as methylcellulose, ethylcellulose, hydroxypropylcellulose, hydroxyethylcellulose, hydroxyethylmethylcellulose and hydroxypropylmethylcellulose, water-soluble polymer compounds such as polyether urethane resins, polyvinyl alcohol, polyethylene oxide and polyacrylamide. Is mentioned. Of these, cellulose derivatives and polyether urethane resins are preferable, and methyl cellulose, hydroxypropyl cellulose, hydroxyethyl methyl cellulose, and hydroxypropyl methyl cellulose are particularly preferable.
The extrusion aid is preferably added in an amount of 0.01 to 2.0% by weight, preferably 0.05 to 0.2% by weight, in 100% by weight of a composition comprising a hydraulic substance, aggregate, extrusion aid and fiber. More preferably.
The amount of the polyoxyalkylene derivative based on 100% by weight of the blend is 0.01 to 2.0% by weight, preferably 0.01 to 0.5% by weight, more preferably 0.00%. 05 to 0.2% by weight. If the amount of the polyoxyalkylene derivative is less than this range, the effect of the present invention cannot be obtained. If the amount exceeds this range, the viscosity of the extrusion aid such as methylcellulose is lost, and the product after extrusion is likely to be cracked. It is not preferable.
The amount of water with respect to 100% by weight of the blend is 15 to 45% by weight. When the polyoxyalkylene derivative is used in the cement-based extrusion molding composition, if the amount of water is reduced to 45% by weight or less by an external ratio, the raw material is remarkably reduced in size, and the amount of swelling of the molded body is reduced. It has been found that the bending strength of the molded body is improved. From this viewpoint, the amount of water is preferably 43% by weight or less, more preferably 40% by weight or less, most preferably 30% by weight or less, and most preferably 25% by weight or less. When the amount of water is less than 15% by weight, the load during kneading of the extrusion molding composition is increased, which is not preferable.
In a preferred embodiment, the hydraulic substance, aggregate, fiber and extrusion aid are first mixed, then a portion of the water is added and mixed into a kneaded state before the polyoxyalkylene derivative and the water are mixed. Add the remainder of. When the hydraulic substance, aggregate, fiber and extrusion aid are first mixed, then a portion of the water is added and mixed, and after kneading, the polyoxyalkylene derivative and the remainder of the water are added. Water is added when the hard substance, aggregate, fiber, and extrusion aid are uniformly mixed, and the polyoxyalkylene derivative is added when the material is uniformly mixed. As a result, the particle size of the material becomes uniform and is easy to mix, which is preferable. The “kneaded state” after adding and mixing a part of water indicates a state in which water almost spreads over the surface of the material obtained by dry mixing the hydraulic substance, aggregate, fiber and extrusion aid. When a hydraulic substance, aggregate, fiber, extrusion aid, water, and polyoxyalkylene derivative are added simultaneously, poor dispersion of materials, particularly fibers, tends to occur and tends to be mixed unevenly.
In this embodiment, it is preferable to use 0.1 to 99.9% by weight of the water to be used as a part of the water initially mixed with the hydraulic substance, aggregate, fiber and extrusion aid. 50 to 99.9% by weight is more preferable, and 90 to 99.9% by weight is more preferable. Moreover, it is preferable to use 0.1 to 99.9% by weight of water to be used as a part of the water to be added later together with the polyoxyalkylene derivative, and it is more preferable to use 0.1 to 50% by weight. More preferably, 0.1 to 10% by weight is used.

各配合１００重量％に対して、表２、表３、表４に示す各ポリオキシアルキレン誘導体及び水を、表２〜４に示す割合で外割添加したものを材料とする。
ポリオキシアルキレン誘導体及び水を除いた上記材料を、アイリッヒミキサーにより２分間均一に混合後、必要な水量の９０重量％を外割で添加して５分間均一に混合する。その後、連続してポリオキシアルキレン誘導体及び残りの水（必要水量の１０重量％）を外割で添加して２分間混合し、セメント組成物を得る。各組成物を、厚さ６０ｍｍ、幅６００ｍｍのダイスを取り付けた押出成形機により押出成形し、６０℃×８時間の条件で湿潤養生を行い、その後１０ｋｇ／ｃｍ^２×６時間の条件でオートクレーブ養生を行った後、長さ３０００ｍｍに切断したものを製品とした。
各製品について、アイリッヒミキサー混合時の電流値、混合後の材料粒径、押出し速度、押出成型時のダイス吐出時の幅膨れ量、押出成型時の表面状態、製品の直線性、曲げ強度及びかさ比重を測定した。測定結果を表２〜表４に示す。
（材料小粒化の評価基準）
「◎」 粒径最大値＜２０ｍｍ：
「○」 材料粒径の大部分は５０ｍｍ以下だが、一部５０ｍｍ以上もある：
「△」 材料粒径５０ｍｍ以上、１００ｍｍ以下程度：
「×」 粒径最大値＞１００ｍｍ
（外観の評価基準）
厚みの誤差＝Δｔとした場合、

（直線性の評価基準）
直線性の誤差＝ΔＬとした場合、

表２、表３、表４からわかるように、本発明のポリオキシアルキレン誘導体を所定量添加し、さらに水の量を外割りで４５重量％以下とすることによって、原料の小粒化が図られ、押出し機へのスムーズな原料供給が可能になった。この結果、押出し速度が向上し、かつ押出し機スクリュー及びダイスへの圧力増大が低減され、ダイス吐出時の膨れ量及び製品直線性が向上する事が分かった。さらに、上記性能を満足させるために必要な適切な量のポリオキシアルキレン誘導体を添加する事による曲げ強度の低下は見られなかった。
例えば、表２に示すように、特定ポリオキシアルキレン誘導体の添加によって、原料が小粒化し、幅膨れ量が低下し、成形体の直線性が向上している。また、実施例２、３、４を比較すると、水を２回に分けて添加することによって、幅膨れ量は小さくなり、成形体の直線性が向上している。
例えば、表３、表４に示すように、特定ポリオキシアルキレン誘導体の添加によって、原料が小粒化し、幅膨れ量が低下し、成形体の直線性が向上している。また、実施例１０〜１４を比較すると、水を２回に分けて添加することによって、幅膨れ量は小さくなり、成形体の直線性が向上している。実施例１０〜１４と比較例２とを対比すると、水の添加量を４５重量％以下とすることによって、原料が小粒化し、成形後の外観、直線性が向上する。実施例１６、１７、１８と比較例３とを比較すると、特定ポリアルキレン誘導体の添加によって、原料が小粒化し、幅膨れ量が小さくなり、成形後の外観、直線性が向上している。さらに、実施例１〜８と実施例９〜１８とを比較すると、水の添加量を低くすることによって、原料がいっそう小粒化し、幅膨れ量が小さくなり、成形体の曲げ強度が向上している。
図１に実施例４のミキサー電流値を示す。粉体原料に水を加えると、保水したセルロース誘導体が粘性を増すことで原料の増粒がはじまり、繊維は原料中に均一に分散し練り込まれる。この時、セルロース誘導体の量が多いほど、加える水の量が多いほど、原料粒子径は大きくなる。そのため、図１に示すように、繊維が充分練り込まれる程度の水を予め加え混合することで（Ａ）、ミキサー電流値の上昇及び、振幅幅の減少を図り、その後設計水量の残りの水をポリオキシアルキレン誘導体と同時に加えることで（Ｂ）、繊維が均一に練り込まれた粒子径の小さい原料を得ることが出来る。
以上述べたように、本発明によれば、押出し成形用材料の混練時の負荷を低減し、押出成形用材料の混練後の材料粒径を小さくでき、成形品の膨れを低減できる。Hereinafter, the present invention will be described with reference to examples.
(Manufacture of each product)
The composition compositions 1 and 2 used are as shown in Table 1. Specific material names are ordinary Portland cement (made by Mitsubishi Materials Corporation) as a hydraulic raw material, silica stone powder (Blaine 3800 ± 400 cm ² / g, made by Fujisaka Crushed Stone Co., Ltd.) and river sand (coarse grain ratio 1.2). , From Kashima, Ibaraki Prefecture) or lightweight aggregate (average particle size of 0.6 mm or less, manufactured by Ube Perlite Co.), pulverized newspaper residual pulp (15 mesh, manufactured by Oji Paper Co., Ltd.) SNB-60T, manufactured by Shin-Etsu Chemical Co., Ltd.).

A material obtained by adding each polyoxyalkylene derivative and water shown in Table 2, Table 3, and Table 4 at a ratio shown in Tables 2 to 4 with respect to 100% by weight of each compound is used.
The above-mentioned material excluding the polyoxyalkylene derivative and water is uniformly mixed for 2 minutes by an Eirich mixer, and then 90% by weight of the required amount of water is added in an extra portion and mixed uniformly for 5 minutes. Thereafter, the polyoxyalkylene derivative and the remaining water (10% by weight of the required water amount) are continuously added in an external ratio and mixed for 2 minutes to obtain a cement composition. Each composition was extrusion-molded by an extruder equipped with a die having a thickness of 60 mm and a width of 600 mm, wet-cured under conditions of 60 ° C. × 8 hours, and then autoclaved under conditions of 10 kg / cm ² × 6 hours. Then, the product was cut into a length of 3000 mm as a product.
For each product, the current value when mixing the Eirich mixer, the particle size after mixing, the extrusion speed, the amount of expansion when discharging the die during extrusion molding, the surface condition during extrusion molding, the linearity of the product, the bending strength and The bulk specific gravity was measured. The measurement results are shown in Tables 2 to 4.
(Evaluation criteria for material atomization)
“◎” Maximum particle size <20 mm:
“◯” The majority of the material particle size is 50 mm or less, but some are 50 mm or more:
“△” Material particle size of about 50 mm or more and 100 mm or less:
“×” Maximum particle size> 100 mm
(Evaluation criteria for appearance)
When thickness error = Δt,

(Evaluation criteria for linearity)
When linearity error = ΔL,

As can be seen from Table 2, Table 3 and Table 4, the raw material can be made smaller by adding a predetermined amount of the polyoxyalkylene derivative of the present invention and further reducing the amount of water to 45% by weight or less. Smooth raw material supply to the extruder is now possible. As a result, it has been found that the extrusion speed is improved, the pressure increase on the extruder screw and the die is reduced, and the swollen amount and product linearity at the time of discharging the die are improved. Furthermore, the bending strength was not lowered by adding an appropriate amount of the polyoxyalkylene derivative necessary for satisfying the above performance.
For example, as shown in Table 2, by adding a specific polyoxyalkylene derivative, the raw material is reduced in size, the amount of width expansion is reduced, and the linearity of the molded body is improved. In addition, when Examples 2, 3, and 4 are compared, the amount of swollen width is reduced by adding water in two portions, and the linearity of the molded body is improved.
For example, as shown in Tables 3 and 4, by adding the specific polyoxyalkylene derivative, the raw material is reduced in size, the amount of swelling is reduced, and the linearity of the molded body is improved. Moreover, when Examples 10-14 are compared, by adding water in two portions, the amount of expansion of the width is reduced, and the linearity of the molded body is improved. When Examples 10 to 14 and Comparative Example 2 are compared, the amount of water added is 45% by weight or less, whereby the raw material is reduced in size and the appearance and linearity after molding are improved. When Examples 16, 17, and 18 are compared with Comparative Example 3, the addition of the specific polyalkylene derivative reduces the size of the raw material, reduces the amount of expansion, and improves the appearance and linearity after molding. Furthermore, when Examples 1-8 are compared with Examples 9-18, by reducing the amount of water added, the raw material is further granulated, the amount of width expansion is reduced, and the bending strength of the molded body is improved. Yes.
FIG. 1 shows the mixer current value of Example 4. When water is added to the powder raw material, the retained cellulose derivative increases in viscosity, whereby the raw material starts to increase in size and the fibers are uniformly dispersed and kneaded in the raw material. At this time, the larger the amount of cellulose derivative and the greater the amount of water added, the larger the raw material particle size. Therefore, as shown in FIG. 1, by adding and mixing water in such a degree that the fibers are sufficiently kneaded in advance (A), the mixer current value is increased and the amplitude width is reduced, and then the remaining water of the design water amount Can be obtained simultaneously with the polyoxyalkylene derivative (B), whereby a raw material having a small particle diameter in which fibers are uniformly kneaded can be obtained.
As described above, according to the present invention, the load during kneading of the extrusion molding material can be reduced, the material particle size after kneading of the extrusion molding material can be reduced, and the swelling of the molded product can be reduced.

Claims (5)

A polyoxyalkylene derivative represented by the following general formula [1], wherein water is externally divided into 100% by weight of a composition comprising a hydraulic substance, an aggregate, an extrusion aid and fibers, and water: A composition for extrusion molding of cement, characterized by adding 0.01 to 2.0% by weight of a polyoxyalkylene derivative having a cloud point of 1% aqueous solution of 40 ° C. or higher.

(However, Z is a residue of a compound containing 2 to 8 hydroxyl groups, R ¹ and R ² are a hydrogen atom, a hydrocarbon group having 1 to 18 carbon atoms, and A ¹ O is an oxyalkylene having 2 carbon atoms. A ² O is an oxyalkylene group having 3 to 8 carbon atoms, the oxyalkylene group of A ¹ O and A ² O may be random or block, a + b + c + d is 1 to 300, and a + c: (b + d = 99: 1 to 2: 8, and l + m = 2 to 8) In the polyoxyalkylene derivative represented by the general formula [1], Z is a residue of a compound containing two hydroxyl groups, the sum of the carbon numbers of R ¹ and R ² is 1 to 8, and A ² The composition according to claim 1, wherein O is an oxyalkylene group having 3 to 4 carbon atoms, wherein l = 1 and m = 1. The composition according to claim 1 or 2, wherein the amount of water added to 100% by weight of the formulation is not more than 25% by weight. The hydraulic substance, the aggregate, the extrusion aid, and the fiber are first mixed, then a part of water is added to form a kneaded state, and then the polyoxyalkylene derivative and the remainder of the water are added. The composition according to any one of claims 1 to 3, wherein: A cement product obtained by curing an extruded product of the composition according to any one of claims 1 to 4.

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