JPH07267706A - Hydraulic inorganic composition and production of inorganic mold using the same - Google Patents

Abstract

PURPOSE:To obtain a hydraulic inorganic composition excellent in fluidity and capable of forming a molding material having a complicated shape and a dense structure even if water is contained only in a quantity close to stoichimetry, and a hardened body having high strength and excellent properties such as freezing and thawing resistance by using this hydraulic inorganic composition. CONSTITUTION:The molding is obtained by using a composition containing 100 pts.wt. hydraulic inorganic material, 15-65 pts.wt. water and 0.5-5 pts.wt. water soluble urethane resin and by extrusion molding or vibration press molding. Otherwise the composition obtained by oscillating mixing is dehydration press molded to obtain the molding.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hydraulic inorganic composition and a method for producing an inorganic molded product using the hydraulic inorganic composition.

[0002]

2. Description of the Related Art A composition obtained by adding a hydraulic inorganic substance such as cement or gypsum and water or an aggregate such as sand to these is molded,
The cured product obtained by curing this molded product is preferably used for structural materials such as construction and civil engineering materials. An extrusion molding method is excellent in terms of productivity as a method for manufacturing a molded body using these hydraulic inorganic substances.

In the extrusion molding method, the composition to be molded is required to have fluidity. Therefore, conventionally, this fluidity has been ensured by using a composition in which a large amount of water is added to a hydraulic inorganic substance. However, even if a molded product is made using a composition containing a large amount of water in this way and the desired cured product is obtained by curing this molded product,
Voids are formed in the obtained cured product due to excess water. Therefore, there is a problem that the obtained cured product has lower physical properties such as strength and freeze-thaw resistance than a cured product obtained by molding and curing with a composition to which a small amount of water is added.

Therefore, in order to obtain a high-strength hydraulic inorganic cured product, fine particles have a Blaine value of 3000 cc / g.
The above silica sand (average particle size of 5 to 10 microns or less, but the shape is different, so there is no exact correspondence) mixed with 100 parts by weight of water to 20 to 20 parts of water.
35 parts by weight, which is added in the smallest possible amount, and a composition obtained by adding a molding aid such as pulp or methyl cellulose for the purpose of ensuring fluidity is molded by an extrusion molding method, and the above-mentioned voids are filled with fine particles. There has been proposed a method for curing the resin (JP-A-2-160650).

[0005]

However, in the above-mentioned method, since the water-cement ratio is small and the specific surface area of the fine particles is very large, water is adsorbed by the fine particles and the fluidity of the composition is extremely poor. However, there is a problem in that a molded body having a simple shape as described in the same publication such as a flat plate can be shaped, but it cannot be applied to a molded body having a complicated shape.

Further, in this method, a water-soluble polymer such as methyl cellulose is added to improve the fluidity of the composition, but such a water-soluble polymer is expensive and combustible. However, the amount added was limited. As a result, the fluidity of the composition is limited, and the problem that it is difficult to shape a complex shape cannot be solved.

The present invention has been made by paying attention to such problems, and even if it contains a small amount of water, it is excellent in fluidity, has a complicated shape, and is formed into a compact structure. It is possible to provide a hydraulic inorganic composition capable of being and a method for producing an inorganic molded body capable of obtaining a cured product having excellent physical properties such as high strength and freeze-thaw resistance using the hydraulic inorganic composition. Has an aim.

[0008]

In order to achieve such an object, a hydraulic inorganic composition according to the invention of claim 1 (hereinafter referred to as "composition of the invention 1") is water. It was configured to include 100 parts by weight of a hard inorganic substance, 15 to 65 parts by weight of water, and 0.5 to 5 parts by weight of a water-soluble polyurethane resin.

The hydraulic inorganic substance used in the present invention is not particularly limited as long as it is an inorganic substance which shows a hardening property when kneaded with water. For example, ordinary portland cement, special portland cement, alumina cement, roman cement, etc. Cement, acid-resistant cement, fire-resistant cement, special cement such as water glass cement, and gypsum, lime, gas-hardening cement such as magnesia cement, and particularly, Portland cement and alumina cement are preferably used in terms of strength and water resistance. It These may be used alone or in combination of two or more.

The water-soluble polyurethane resin used in the present invention has polyethylene glycol as the main component of the glycol component and diphenylmethane diisocyanate as the isocyanate component, and has a weight average molecular weight of 500.
Those of 0 to 50,000 are preferable. That is, when the weight average molecular weight is 5,000 or less, the viscosity of the polyurethane resin aqueous solution is too low, and when the composition is made to flow, only water is separated and cannot flow uniformly, and when the weight average molecular weight becomes 50,000 or more. However, the viscosity of the aqueous polyurethane resin solution becomes too high, and the fluidity of the mixture may be poor, so that the desired shape may not be obtained.

As a water-soluble polyurethane resin satisfying such conditions, a water-soluble polyurethane resin having a structure represented by the following structural formula (A) (for example, NK50W manufactured by Sanyo Kasei Co., Ltd. is preferable). Can be mentioned.

[0012]

[Chemical 1] If the amount of the water-soluble polyurethane resin added is less than 0.5 part by weight, the fluidity of the composition will be poor, and if it exceeds 5 parts by weight, the water resistance of the resulting molded article will decrease. And is preferably 1 to 4 parts by weight. Also,
The amount of water added is 1 with respect to 100 parts by weight of the hydraulic inorganic substance.
If the amount is less than 5 parts by weight, the hydraulic inorganic substance will not be sufficiently cured, and the dispersibility of the composition will decrease. If it exceeds 65 parts by weight, the mechanical strength of the obtained molded product will decrease, so that
It is limited to 65 parts by weight, preferably 20 to 50 parts by weight.

The hydraulic inorganic composition of the present invention may further contain reinforcing fibers and inorganic fillers, if necessary. As the reinforcing fiber, any one can be used depending on the performance desired to be imparted to the molded body, for example, vinylon, polyamide, polyester, polypropylene, carbon, aramid, acrylic, synthetic fiber such as rayon, glass fiber, potassium titanate, Inorganic fibers such as steel can be used. Particularly when synthetic fibers are used, the flexibility is remarkably improved.

If the thickness of the above-mentioned reinforcing fiber is too thin, it will be re-aggregated at the time of mixing and fiber balls will be easily formed by entanglement, and the strength of the resulting molded article will not be further improved, and it will be too thick or too short. And the effect of improving the tensile strength is small, and if it is too long, the dispersibility and orientation of the fiber tend to be deteriorated. Therefore, a fiber diameter of 2 to 300 μm and a fiber length of 1 to 15 mm are preferable.

The amount of the reinforcing fiber added is the hydraulic inorganic substance 1
When it is less than 0.1 parts by weight, the reinforcing effect is small when it is less than 0.1 parts by weight, and when it exceeds 20 parts by weight, the dispersibility of the fibers tends to decrease, so about 0.1 to 20 parts by weight is preferable. The inorganic filler is not particularly limited as long as it does not dissolve in water, does not inhibit the curing reaction of the hydraulic inorganic substance, and does not significantly inhibit the action of any constituent material used during the production of the molded body, for example, Aggregates for cement mortar such as silica sand and river sand, admixture for mixed cement such as fly ash, silica flower, silica fume, bentonite, blast furnace slag, natural minerals such as sepiolite, wollastonite, mica, calcium carbonate, diatomaceous earth, etc. To be For the purpose of further reducing the weight, silica balloon, perlite, fly ash balloon, shirasu balloon, glass balloon, inorganic natural foam such as foamed clay may be used. These may be used alone or in combination of two or more.

The above-mentioned inorganic filler has an average particle size of 0.03.
If it is less than μm, the strength of the resulting molded article tends to decrease, and if it exceeds 300 μm, the particles of the inorganic filler become difficult to disperse and the impact strength tends to decrease, so about 0.03 to 300 μm. Are preferred. Further, the above-mentioned inorganic filler is added in an amount of the hydraulic inorganic substance 100.
If the amount is more than 200 parts by weight, the strength of the obtained molded article may be reduced, so that the addition amount is preferably 200 parts by weight or less.

The hydraulic inorganic molded article obtained from the composition of the present invention 1 is heated during molding, for example, during press molding, if a hydraulic inorganic material having a high curing rate such as gypsum is used. Thus, it can be cured simultaneously with molding. The obtained molded body may be subjected to natural curing for a long time, but when a hydraulic inorganic substance such as Portland cement having a slow curing reaction is used, the molded body is heated and humidified. It is possible to perform curing by a conventionally known method such as performing so-called autoclave curing at the same time to accelerate the curing reaction and improve the mechanical properties.

A method for producing an inorganic molded body according to the invention of claim 2 (hereinafter referred to as "the production method of the invention 2")
In the above, the hydraulic inorganic composition of the first invention was extruded. The method for producing an inorganic molded body according to the invention of claim 3 (hereinafter, referred to as “production method of the present invention 2”) is
The hydraulic inorganic composition of the present invention 1 was subjected to vibration pressure molding.

In the above structure, the mold used for vibration pressure molding is not particularly limited as long as it can perform pressure molding while applying a slight vibration to the composition supplied into the mold, but conventionally known pressing Examples include those in which a known vibrator is attached to a mold, for example, a vibration press molding machine described in the research result report of Aichi Prefectural Ceramics Technology Center in 1988.

The vibration direction may be any direction, but it is preferable to apply the vibration in all three-dimensional directions in order to enhance the effect of vibration. If the applied frequency is less than 100 Hz, the filling of the slurry in the mold becomes defective and 10
If it exceeds 000 Hz, a lot of energy is required to give vibration, so 100 to 10,000 Hz is preferable.
Further, when the amplitude is less than 1 μm, the shapeability of the portion having a small radius of curvature is poor, and when it exceeds 500 μm, a lot of energy is required to give vibration, so that the amplitude is preferably 1 to 500 μm.

A method for producing an inorganic molded article according to the invention of claim 4 (hereinafter, referred to as "production method of the present invention 4")
Is a water-soluble polyurethane resin 0.
5 to 5 parts by weight is dissolved, and further inorganic filler is 5 to 100
Add parts by weight and mix, then add 0.3 to 10 reinforcing fibers.
A composition obtained by adding 100 parts by weight of a hydraulic inorganic substance to the mixture after adding parts by weight and oscillating and mixing the mixture was further fed into a mold and dehydrated and pressed.

In the above structure, the oscillating mixing is a device in which a flexible rubber container is mounted on a disc-shaped oscillating plate without using a stirring blade, and the inclination direction and angle of the oscillating plate are determined. By continuously changing, the rubber container is deformed and rocked, the mixed materials put into the rubber container are accelerated, and the speed and direction are changed to scatter in random directions. The method of mixing by mixing. In addition, the cycle of the movement of this rocker is usually 1 to
3 times / sec.

[0023]

According to the constitution of the composition of the present invention 1, the above water-soluble polyurethane resin has the same dispersibility, water retention property, and water-dispersing ability as compared with the conventional water-soluble polymer substances such as cellulose ether, polyvinyl alcohol and polyacrylic acid. Although it has a bonding force for sticking together the hydraulic inorganic particles, since the viscosity of the aqueous solution is low, the slurry becomes soft and fluid even if the amount of water added is reduced.

According to the constitution of the production method of the present invention 2, the composition of the present invention is extruded in the form of a slurry having a high fluidity which is difficult to understand even if the amount of water added is small. It is possible to prevent the occurrence of cracks and cavities that occur in the product, and the composition may be defectively filled even in the case of a large molded product in which the size of the product to be molded exceeds three times the screw diameter of the extruder. It can also solve problems such as not being extruded in a straight line.

According to the constitution of the production method of the present invention 3, the composition of the present invention in the form of a slurry having a high fluidity which is difficult to understand even when the amount of water added is small is used to perform vibration pressing. By virtue of the vibration, the composition exhibits more fluidity, and it is possible to obtain a compact having a complex structure and a dense structure which cannot be obtained by the conventional manufacturing method. According to the configuration of the manufacturing method of the present invention 4, since the inorganic filler is mixed with the aqueous solution of the water-soluble polyurethane resin, the reinforcing fiber is added to the viscous mixture and the mixture is mixed by rocking. Are evenly distributed without forming fiber balls, scratching or cutting. Then, to add a hydraulic inorganic substance to this mixture and mix again,
The particles of the hydraulic inorganic substance can be easily dispersed between the inorganic filler and the reinforcing fiber to obtain a uniform composition.

Moreover, this composition is subjected to dehydration press shaping, but since the composition obtained is provided with sufficient fluidity by a water-soluble polyurethane resin even with a small amount of water, water is separated. Instead, the entire mold is quickly filled and completely shaped. Further, in order to maintain the shape retention, the mold is removed after dehydration in the mold, but since the amount of water added is small, sufficient shape retention can be obtained with a small amount of dehydration.

[0027]

EXAMPLES Examples of the present invention will be described in more detail below in comparison with comparative examples. (Examples 1 to 7, Comparative Examples 1 to 6) The formulations shown in Tables 1 and 2 were dry blended and mixed with water in an amount shown in Tables 1 and 2 in a mixer having a capacity of 10 liters, and then mixed in a kneading machine. The composition obtained by feeding and kneading is extruded by an extruder to give a width of 30
A flat plate having a thickness of 0 mm and a thickness of 7 mm was obtained. After cutting this plate to a length of 300 mm, apply 5 kg of pressure at a pressure of 20 kg / cm ^2.
Press molding for seconds, height 25mm, width 5mm, length 300
300 mm x 300 mm x with mm cross-shaped ribs
A 5 mm flat plate-shaped molded body was obtained, and this molded body was heated at 60 ° C. and 90 ° C.
Curing was performed for 6 hours in an atmosphere of% RH to obtain a cured product. A metal mold having a parallel portion of 100 mm in the extrusion direction and an extruder having a screw diameter of 200 mm were used for the extrusion molding.

The physical properties of the cured product obtained as described above were examined, and the evaluation results are shown in Tables 1 and 2. Each component in Tables 1 and 2, that is, the cement is ordinary Portland cement (manufactured by Onoda Cement Co., Ltd.), and the fly ash is JIS A 620.
1 equivalent product (true specific gravity 2.3, bulk specific gravity 0.6: manufactured by Kanden Kako Co., Ltd.), vinylon fiber having a fiber diameter of 15 μm and fiber length of 3 mm, and methylcellulose having a viscosity of 2% aqueous solution at 20 ° C. 30,000 cps hydroxypropylmethyl cellulose, polyurethane resin having the structure shown in (A) above (N manufactured by Sanyo Kasei Co., Ltd.
K50W and weight average molecular weight 28,000) were used.

The physical properties were evaluated by the following physical property evaluation test methods. [Physical property evaluation test] (1) Shapeability The rib surface of the obtained flat plate-shaped cured product having the cross-shaped ribs was visually observed, and ○ was generated when there were no defective moldings such as defective filling and sink marks. Those marked with "x" are marked. (2) Bending strength A test piece was obtained by cutting the obtained cured body, and the bending strength was measured by JI.
It was measured according to the method of S A 1408. (3) Freeze-thaw property A test piece was obtained by cutting the obtained cured product, and
Freeze and thaw according to the method of 666A, take out a test piece every 10 cycles, and measure the bending strength in the same manner as the above bending strength.
The number of cycles in% is shown.

(Note) Comparative Examples 1 to 3 are blends using methyl cellulose, and the molding pressure of Comparative Example 1 was poor, so the molding pressure was increased in Comparative Example 2 and further in Comparative Example 3. Increased water content.

[0031]

[Table 1]

[0032]

[Table 2] Extrusion using the compositions of the invention from Tables 1 and 2 above
It is well understood that, when the press molding is performed, a cured product having excellent physical properties such as bending strength and freeze-thaw resistance can be obtained as compared with a conventional composition using methyl cellulose. (Examples 8 to 12, Comparative Examples 7 to 9) The formulations shown in Table 3 were dry blended, mixed with a predetermined amount of water in a mixer having a capacity of 10 liters, and then fed to a kneader to be kneaded. The obtained composition was extrusion-molded with an extruder to obtain a flat plate having a width of 300 mm and a thickness of 7 mm. This plate is cut into a length of 300 mm to obtain a flat plate-shaped molded body,
Curing was performed for 6 hours in an atmosphere of% RH to obtain a cured product. For extrusion molding, a die having a parallel portion of 100 mm in the extrusion direction and a vacuum extruder having a screw diameter of 100 mm (manufactured by Miyazaki Iron Works Co., Ltd.) were used.

The physical properties of the cured product obtained as described above were examined, and the evaluation results are shown in Table 3 together.
In addition, as each component in Table 3, that is, as cement,
Ordinary Portland cement (manufactured by Onoda Cement Co., Ltd.), fly ash equivalent to JIS A 6201 (true specific gravity 2.3, bulk specific gravity 0.6: manufactured by Kanden Kako Co., Ltd.), vinylon fiber 14 μm, fiber length 6 mm, as the methyl cellulose, hydroxypropyl methyl cellulose having a viscosity of 30,000 cps in a 2% aqueous solution at 20 ° C., and as the water-soluble polyurethane resin, having the structure shown in (A) above (NK5 manufactured by Sanyo Kasei Co., Ltd.).
0 W and a weight average molecular weight of 28,000) were used.

The physical properties were evaluated by the following physical property evaluation test methods. [Physical property evaluation test] Tear of molded article Visually determine whether or not tears of the molded article have occurred,
Those that did not occur were marked with ◯, and those that did occur were marked with x. Linearity During molding, the amount of movement of the molded body in the direction perpendicular to the extrusion direction was measured at a position of 500 mm from the land exit. Cured Body Density The weight of the obtained molded body was measured and divided by the volume. Bending Strength The obtained molded body was cut to obtain a test piece of 150 × 40 × 20 mm, and the bending strength was measured according to the method of JIS A 1408.

[0035]

[Table 3] From Table 3 above, it can be seen that by carrying out the production method of the present invention 2 in which the composition of the present invention 1 is extrusion-molded, it is possible to obtain a molded article excellent in linearity without generation of tears and cavities. Moreover, it is understood that if this molded body is cured by curing, a dense and high-strength cured body can be obtained.

(Examples 13 to 19, Comparative Example 10) The formulations shown in Table 4 were dry blended, mixed with water in an amount shown in Table 4 in a mixer having a capacity of 10 liters, and then fed to a clay kneader. The composition obtained by kneading, extrusion molding with an extruder,
A flat plate having a width of 300 mm and a thickness of 8 mm was obtained. After this plate was cut into a length of 300 mm, it was supplied to a vibration press molding machine (manufactured by Asahi Engineering Co., Ltd., product name: SA-50), and 20 kg / cm ² was applied for 5 seconds while vibrating at a frequency of 1000 Hz and an amplitude of 10 μm. Press molding with the pressure of
A 300 mm × 300 mm × 5 mm flat plate-shaped molded product having a cross-shaped rib with a height of 35 mm, a width of 5 mm, and a length of 300 mm was obtained, and the molded product was cured and cured in an atmosphere of 60 ° C. and 90% RH for 6 hours. A cured product was obtained. For extrusion molding, a die having a parallel portion of 100 mm in the extrusion direction and an extruder having a screw diameter of 200 mm were used.

The physical properties of the cured product obtained as described above were examined, and the evaluation results are shown in Table 4 together.
In addition, as each component in Table 4, that is, as cement,
Ordinary Portland cement (manufactured by Onoda Cement Co., Ltd.), fly ash equivalent to JIS A 6201 (true specific gravity 2.3, bulk specific gravity 0.6: manufactured by Kanden Kako Co., Ltd.), vinylon fiber 15 μm, fiber length 3 mm, as the methyl cellulose, hydroxypropyl methyl cellulose having a viscosity of 30,000 cps in a 2% aqueous solution at 20 ° C., and as the water-soluble polyurethane resin, the one having the structure shown in the above (A) (NK5 manufactured by Sanyo Kasei Co., Ltd.
0 W and a weight average molecular weight of 28,000) were used.

The physical properties were evaluated by the following physical property evaluation test methods. [Physical property evaluation test] (1) Shapeability The rib surface of the obtained flat plate-shaped cured product having cross-shaped ribs was visually inspected, and if there were no molding defects such as defective filling or sink marks, the mark was ○, rib Is marked with a height of 25 mm or more and insufficiently filled, and x is marked with a height of 25 mm or less. (2) Bending strength A test piece was obtained by cutting the obtained cured body, and the bending strength was measured by JI.
It was measured according to the method of S A 1408. (3) Freeze-thaw property A test piece was obtained by cutting the obtained cured product, and
Freeze and thaw according to the method of 666A, take out the test piece every 10 cycles, and measure the bending strength in the same manner as the above bending test.
The number of cycles in% is shown.

[0039]

[Table 4] From Table 4 above, it can be seen that by carrying out the production method of the present invention 3 in which the composition of the present invention 1 is subjected to vibration pressure molding, it is possible to accurately obtain a molded article having a complicated shape without generating cavities. Moreover, it can be seen that by curing and curing this molded body, a dense and high-strength cured body excellent in freeze-thaw resistance can be obtained.

(Examples 20 to 26, Comparative Examples 11 to 16)
After mixing the aqueous solution of the water-soluble polyurethane resin and the inorganic filler in the amounts shown in Tables 5 and 6, the reinforcing fibers in the amounts shown in Tables 5 and 6 were added, and an omnimixer manufactured by Chiyoda Giken Co., Ltd. ), And vortex mixing was performed for 5 seconds.
After that, cement was added, and the mixture was vibrated and mixed again for 10 minutes, and the obtained composition was filled in a flat plate mold having a thickness of 5 mm,
Dehydrated press molding was performed at 70 kg / cm ² , and the obtained molded body was cured by curing at 60 ° C. and 90% RH for 6 hours to obtain a cured body.

Each of the components shown in Tables 5 and 6, that is, cement is ordinary Portland cement (manufactured by Onoda Cement Co., Ltd.), and fly ash is JIS A 620.
1 equivalent product (true specific gravity 2.3, bulk specific gravity 0.6: manufactured by Kanden Kako Co., Ltd.), vinylon fiber having a fiber diameter of 15 μm and fiber length of 3 mm, and methylcellulose having a viscosity of 2% aqueous solution at 20 ° C. As the hydroxypropylmethyl cellulose having a 30,000 cps and the water-soluble polyurethane resin having the structure shown in the above (A) (NK50W manufactured by Sanyo Chemical Co., Ltd., weight average molecular weight 28,000) were used.

The physical properties were evaluated by the following physical property evaluation test methods. [Physical Property Evaluation Test] (1) Dispersibility of Fiber After rocking and mixing, the mixture was visually evaluated for dispersibility of the fiber. (2) Moldability The filling property of the material into the pressing mold at the time of press shaping was visually observed, and the completely filled product was evaluated as ◯, and the defective filling product was evaluated as x. (3) Bending strength A test piece was obtained by cutting the obtained cured product, and the bending strength was measured by JI.
It was measured according to the method of S A 1408.

(Note) Comparative Example 11 was a mixture using methyl cellulose, and the moldability by press molding was poor, so the amount of water was increased so that Comparative Example 12 could be molded.

[0044]

[Table 5]

[0045]

[Table 6] From Tables 5 and 6 above, it is understood that by carrying out the production method of the present invention 4, it is possible to accurately form a dense molded body in which the reinforcing fibers are uniformly dispersed. Moreover, it is understood that if the obtained molded product is cured and cured, a hardened product having excellent freeze-thaw resistance and being dense and having high strength cannot be obtained.

[0046]

EFFECTS OF THE INVENTION Since the hydraulic inorganic composition of the present invention 1 is constituted as described above, it is soft even if the amount of water added is small, has a high fluidity, and has a complicated shape by extrusion molding or pressure molding. It is possible to obtain a dense molded body having no cracks or cavities by molding the molded body of 1. Therefore, a cured product having a complicated shape can be obtained with high yield and high productivity. Further, the obtained cured product has high strength and excellent physical properties such as freeze-thaw resistance.

Further, in the method for producing a hydraulic inorganic molded article of the present invention 2, since the composition has fluidity, it is possible to prevent the breakage which occurs in the conventional extrusion molded article, and the dimension of the product to be molded. However, even in the case of a large molded product having a screw diameter of more than 3 times the extruder, problems such as poor filling of the composition, generation of cavities, and linear extrusion of the molded product can be solved. .

Therefore, a desired molded product can be continuously molded with good yield by extrusion molding. Moreover,
When this molded product is cured by curing, it is possible to obtain a cured product which has high strength and excellent physical properties such as freeze-thaw resistance and can be suitably used for building materials such as roof tiles. Since the method for producing a hydraulic inorganic molded article of the present invention 3 imparts vibration to the press-molding die, it is possible to further impart fluidity to the above-mentioned composition, which is complicated as not obtained by the conventional production method. It is possible to obtain a compact having a dense and fine structure.

Therefore, when this molded body is cured by curing, it is possible to efficiently obtain a cured body having various shapes having high strength and excellent physical properties such as freeze-thaw resistance and suitable for use in building materials such as roof tiles. Can be manufactured. In the method for producing a hydraulic inorganic molded body of the present invention 4, after the inorganic filler is mixed with the aqueous solution of the water-soluble polyurethane resin, the reinforcing fiber is added to the viscous mixture, and the mixture is mixed by rocking. The reinforcing fibers are evenly distributed without forming fiber balls, scratching or cutting. Then, since the hydraulic inorganic substance is added to this mixture and mixed again, the particles of the hydraulic inorganic substance are easily dispersed between the inorganic filler and the reinforcing fibers, and a uniform composition can be obtained.

Moreover, this composition is subjected to dehydration press shaping, but since the composition obtained is provided with sufficient fluidity by a water-soluble polyurethane resin even with a small amount of water, water is separated. Instead, the entire mold is quickly filled and completely shaped. Further, in order to maintain the shape retention, the mold is removed after dehydration in the mold, but since the amount of water added is small, sufficient shape retention can be obtained with a small amount of dehydration.

Therefore, if this molded body is cured by curing, it is possible to efficiently obtain a cured body having various shapes having high strength and excellent physical properties such as freeze-thaw resistance and suitable for use in building materials such as roof tiles. Can be manufactured.

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Claims (4)

[Claims] 1. 100 parts by weight of a hydraulic inorganic substance and 15 to 15 parts of water.
A hydraulic inorganic composition comprising 65 parts by weight and 0.5 to 5 parts by weight of a water-soluble polyurethane resin. 2. A method for producing an inorganic molded body, which comprises subjecting the hydraulic inorganic composition according to claim 1 to extrusion molding. 3. A method for producing an inorganic molded body, which comprises subjecting the hydraulic inorganic composition of claim 1 to vibration pressure molding. 4. 0.5 to 5 parts by weight of a water-soluble polyurethane resin is dissolved in 15 to 65 parts by weight of water, and 5 to 100 parts by weight of an inorganic filler is further added and mixed. After adding 10 parts by weight and oscillating and mixing, 100 parts by weight of a hydraulic inorganic substance is added to this mixture and oscillatingly mixed, and the resulting composition is fed into a desired mold and dehydrated and pressed. Body manufacturing method.