JPH0564807A - Manufacture of fiber reinforced hydraulic inorganic composition and manufacture of compact - Google Patents

Abstract

(57) [Summary] [Purpose] Even if a relatively small amount of water is mixed with a hydraulic inorganic substance, a large amount of reinforcing fibers can be mixed and evenly dispersed. The method for producing a fiber-reinforced hydraulic inorganic composition and a molded article is obtained. [Structure] In a first step, an inorganic filler 2 to 20 is added to an aqueous solution in which 0.1 to 0.5 parts by weight of a foaming agent polymer substance is dissolved or is being dissolved in 20 to 35 parts by weight of water.
1 part by weight is added and mixed, or 20 to 35 parts by weight of water is dissolved in a foaming agent so that the concentration of the aqueous solution is 5 to 20% by weight, and the mixture is stirred to foam to give the above mixture in the second step. , 5 to 25 parts by weight of reinforcing fibers are added and mixed by shaking, and 100 parts by weight of a hydraulic inorganic substance and 1 to powder of a water-soluble polymer are added to the mixture obtained in the second step in the third step. A method for producing a fiber-reinforced hydraulic inorganic composition and a molded article, which comprises adding 5 parts by weight, mixing and kneading.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a hydraulic inorganic composition in which a large amount of fiber reinforcement is uniformly dispersed, and a method for producing a molded product from the composition.

[0002]

2. Description of the Related Art A molded article using a hydraulic inorganic substance such as cement, mortar or gypsum exhibits excellent compressive strength and is therefore used in various structural materials. However, since the tensile strength of a molded body made of a hydraulic inorganic substance is lower than that of the compressive strength, a method of incorporating a reinforcing material is often used. For example, in a cement molded product, asbestos is mixed as a reinforcing material in order to improve the moldability during molding and to increase the mechanical strength after curing. However, in recent years, the problem of carcinogenicity caused by using asbestos has been pointed out. Therefore, various synthetic fibers have been used as a reinforcing material to replace asbestos.

As a method for obtaining a fiber-reinforced cement mixture using synthetic fibers as a reinforcing material, JP-A-51-1112
No. 35 discloses a cement extrusion molding mixture having a length of 3 to
A method of mixing 10 mm glass fiber or synthetic fiber is disclosed. Here, the reinforcing fibers having a length of 10 mm or less are used to prevent the reinforcing fibers from protruding from the surface of the molded product immediately after being discharged from the extruder.

However, as compared with asbestos which is excellent in dispersibility, glass fibers and synthetic fibers are entangled with each other to easily form fiber balls, and the fiber balls once formed are easier to form. Not disentangled. Therefore, it tends to be difficult to uniformly disperse the fibers in the cement matrix. As a result, it was difficult to increase the strength of the obtained cured product as set. That is, if only a general mixing method is used, even if fibers having a length of about 10 mm are used as described above, the amount of reinforcing fibers that can be uniformly dispersed is 1
The limit was about 4 parts by weight.

On the other hand, as a method for improving the dispersibility of reinforcing fibers, Japanese Patent Laid-Open No. 58-2136666 discloses that 30 to 100 parts by weight of an inorganic filler and 0.2 to 10 parts by weight of synthetic fibers are used with respect to 100 parts by weight of cement. And cement 10
After adding 15 to 30 parts by weight of water to 0 parts by weight and mixing using a kneading machine that easily scratches the fiber surface during kneading,
A method is disclosed in which 30 to 100 parts by weight of water necessary for shaping a cured product is added to perform shaping.

Further, as a method for dispersing and mixing reinforcing fibers in a hydraulic matrix more and more uniformly, in JP-A-63-67109, the viscosity of the hydraulic matrix is adjusted to 40 poise or more, preferably 70 poise or more. A method of adding short fibers in the above state is disclosed.

Further, in JP-A-50-148425, fibers are mixed and dispersed in a suspension obtained by mixing 2 to 20 parts by weight of water with 1 part by weight of a hydration curable material. Thereafter, a method is disclosed in which the suspension is mixed with the remaining amount of the hydration curable material to allow a larger amount of the reinforcing fibers to be evenly dispersed.

Further, Japanese Patent Publication No. 57-19009 discloses that
A method in which 0.5 to 10 parts by weight of short fibers and 17 to 35 parts by weight of water are mixed with 100 parts by weight of cement, kneaded, extruded into a plate shape by an extrusion molding machine, and subsequently pressed into a roof tile shape by a pressing machine. Is disclosed.

[0009]

However, in the method described in JP-A-58-213666, since the synthetic fiber is added to the cement and the inorganic filler together with a small amount of water and kneaded, the kneading itself is performed well. However, there is a risk that the fibers will be innumerably scratched or cut and the strength of the fibers itself will deteriorate. As a result, there is a problem that the reinforcing effect obtained when a predetermined amount of reinforcing fiber is mixed cannot be sufficiently obtained.

Further, according to the methods described in JP-A-63-67109 and JP-A-50-148425, the dispersibility of the fiber can be increased, but the compounding ratio of water to cement, that is, the water-cement ratio. It was effective only when 50 to 100 parts by weight and a relatively large amount of water were added.
That is, when the water-cement ratio was lowered in order to obtain a more dense and high-strength cured product, the reinforcing fibers could not be defibrated sufficiently, and the fiber balls tended to occur. .. Further, regarding the mixing amount of the reinforcing fiber, particularly in the case of the organic fiber, about 5 parts by weight could be dispersed evenly.

Further, according to the method described in Japanese Patent Publication No. 57-19009, the amount of short fibers mixed is set to 0.5 to 10 parts by weight, but the most remarkable mixing effect is 2 to 5 parts by weight. Parts, and when 5 parts by weight or more is mixed, there is a problem that the dispersion becomes poor and the mechanical properties of the molded product are deteriorated.

The object of the present invention is to solve the above problems and to disperse synthetic fibers in a large amount and uniformly in a hydraulic inorganic substance composition even when a relatively small amount of water is added to the hydraulic inorganic substance. , The strength is uniform and the reinforcing effect of the reinforcing fiber can be maximized, that is, the bending strength,
It is an object of the present invention to provide a method for producing a fiber-reinforced hydraulic inorganic molding having excellent tensile strength and impact resistance and excellent surface smoothness.

[0013]

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, Examples include plain cements such as Roman cement, acid-resistant cements, fire-resistant cements, special cements such as water glass cements, and air-hardening cements such as gypsum, lime, and magnesia cements. Particularly, in terms of strength and water resistance, Portland cement and alumina cement are preferably used.

The water-soluble polymer used in the present invention is dissolved in water to give viscosity, enhances dispersibility of the inorganic filler and reinforcing fiber, enhances fluidity of the mixture, and improves shapeability. Moreover, it is not particularly limited as long as it is a polymer substance which can absorb excess water in the hardened cement and serve as a binder for filling voids between cement particles, and examples thereof include methylcellulose, hydroxymethylcellulose and hydroxy. Examples thereof include cellulose ethers such as ethyl cellulose, carboxymethyl cellulose and hydroxypropylmethyl cellulose, polyvinyl alcohol, and polyacrylic acid.

As the reinforcing fiber used in the present invention, any reinforcing fiber can be used according to the performance to be imparted to the molded product, and examples thereof include vinylon, polyamide, polyester,
Synthetic fibers such as polypropylene and glass fibers can be used. In particular, when synthetic fibers are used, it is possible to impart flexibility that cannot be obtained by conventional hydraulic inorganic molded articles. Further, if the thickness of the reinforcing fiber is too thin, it reaggregates during mixing, fiber fibers are likely to be formed due to entanglement, and the strength of the obtained molded body is not further improved. If it is too long, the reinforcing effect such as improvement in tensile strength is small, and if it is too long, the dispersibility and orientation of the fibers are deteriorated. Therefore, the thickness is 0.5 to 40 denier and the length is 1
-15 mm is preferable.

If the amount of water used in the production method of the present invention is less than 20 parts by weight with respect to 100 parts by weight of the hydraulic inorganic substance, the hydraulic inorganic substance is not sufficiently cured, and
The reinforcing fiber and the inorganic filler have low dispersibility, and when the amount exceeds 35 parts by weight, the mechanical strength of the obtained molded article decreases, so the content is limited to 20 to 35 parts by weight.

The inorganic filler used in the production method of the present invention 1 does not dissolve in water, does not inhibit the curing reaction of the hydraulic inorganic substance, and functions of all the constituent materials used in the production method of the present invention. It is not particularly limited as long as it does not significantly inhibit, for example, aggregates for cement mortar such as silica sand and river sand, fly ash, silica flower, silica fu
Examples include mixed cement admixtures such as aluminum, bentonite, and blast furnace slag, and natural minerals such as sepiolite, wollastonite, calcium carbonate, and mica. These may be used alone or in combination of two or more kinds.

The above-mentioned inorganic filler has an average particle size of 0.03.
If it is less than μm, the dispersibility of the particles of the inorganic filler between the reinforcing fibers is not further improved, and only the difficulty in production is raised. Since it becomes difficult for the particles to disperse and the reinforcing fibers tend to aggregate, 0.03 to 500 μm is preferable.

In the method for producing the fiber-reinforced hydraulic inorganic molded article according to the first aspect of the present invention, first, in the first step, the water 2
An inorganic filler is added to and mixed with an aqueous solution in which a water-soluble polymer substance is dissolved or is being dissolved in an amount of 0 to 35 parts by weight.

If the amount of the water-soluble polymer substance added in the first step of the present invention is less than 0.1 parts by weight based on 100 parts by weight of the hydraulic inorganic substance, the reinforcing fibers to be added later are aggregated. Of the inorganic filler, and the effect of suppressing the precipitation of the inorganic filler cannot be obtained. If added in excess of 0.5 part by weight, the viscosity will increase too much and the dispersibility of the reinforcing fiber added later will be reduced. Therefore, it is limited to 0.1 to 0.5 parts by weight.

The inorganic filler added in the first step of the present invention 1 is 2 per 100 parts by weight of the hydraulic inorganic substance.
If the amount is less than 10 parts by weight, the particles of the inorganic filler become difficult to disperse between the reinforcing fibers, so that the reinforcing fibers are easily aggregated. If the amount exceeds 20 parts by weight, the dispersing effect of the reinforcing fibers is not further improved, and the inorganic filler is added. 1 to 20 because the material will settle
Limited to parts by weight. Since the inorganic filler may be added to the liquid in which the water-soluble polymer substance is being dissolved in water, the water-soluble polymer substance may be a material having excellent solubility in water, such as hydroxypropylmethylcellulose. In the case of using a solvent or the like, the inorganic filler may be mixed with water at the same time as the water-soluble polymer substance.

In the second step of the present invention 1,
Reinforcing fibers are added to the mixture obtained in the first step, and oscillating mixing is performed. When the amount of the reinforcing fiber added is less than 5 parts by weight with respect to 100 parts by weight of the hydraulic inorganic substance, the reinforcing effect such as improvement in tensile strength is small, and when it exceeds 25 parts by weight, the fiber is entangled due to the entanglement of fibers by the method of the present invention. Since the ball is formed and the strength of the obtained molded article is reduced, the content is limited to 5 to 25 parts by weight.

The above-mentioned 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 oscillating plate is controlled by the angle of its inclination direction. By continuously changing, the rubber container filled with the materials to be mixed rocks while deforming, accelerating the contents, and changing the speed and direction to scatter them in random directions. The method of mixing. The cycle of movement of the rocker is usually 1 to 3 times / sec. As an apparatus for performing such oscillating mixing, there is, for example, an omni mixer.

Next, in the third step, 100 parts by weight of a hydraulic inorganic substance and 1-5 parts by weight of a water-soluble polymer powder are added to the mixture obtained in the second step and mixed. ,
Knead.

As the water-soluble polymer powder added in the third step, the water-soluble polymer added in the first step can be used. The water-soluble polymer added in the third step is a bonding agent for absorbing excess water in the hardened cement body and filling voids between cement particles, so it needs to be added as a powder. If the amount is less than 1 part by weight with respect to 100 parts by weight of the hydraulic inorganic substance, the strength of the obtained molded article decreases, and if it exceeds 5 parts by weight, the water resistance of the obtained molded article decreases, so that 1 to 5 parts by weight. Limited to

In the third step, an inorganic filler may be added in addition to the hydraulic inorganic substance powder and the water-soluble polymer powder. As the inorganic filler, those listed as the inorganic filler added in the first step can be used. The inorganic filler may be the same as or different from the inorganic filler added in the first step. Further, they may be used alone or in combination of two or more kinds. The addition amount of the above inorganic filler is 2 with respect to 100 parts by weight of the hydraulic inorganic substance.
If it exceeds 00 parts by weight, the strength of the obtained molded article will decrease, so it is preferably 200 parts by weight or less.

The mixing method and kneading method used in the third step are not particularly limited, and any conventionally known mixer and kneader can be used. The foaming agent used in the production method of the present invention 2 does not significantly impair the action of any constituent material used in the production method of the present invention among materials that generate bubbles when dissolved in water and stirred. There is no particular limitation as long as it is an alkylbenzene sulfonate such as sodium p-dodecylbenzenesulfonate, sodium lauryl sulfate, ammonium lauryl sulfate, triethanolamine salt, various salts of polyoxyethylene lauryl ether sulfate, and polymethylsiloxane. Type surfactants, polypeptides having a molecular weight of 5,000 to 15,000 consisting of protein hydrolysates, and the like. These may be used alone or in combination of two or more kinds.

If necessary, organic stabilizers such as polyethylene oxide, polyvinyl alcohol and various salts of stearic acid, inorganic stabilizers such as various salts of aluminic acid, etc. are added to these foaming agents. Good. Examples of such a foaming agent include Takenaka Oil and Fats Co., Ltd., trade name: Airset, San Orient Chemical Co., Ltd., trade name: Glufoam, and the like.

In the method for producing the fiber-reinforced hydraulic inorganic molded article according to the second aspect of the present invention, first, in the first step, the water 2
The foaming agent is dissolved in 0 to 35 parts by weight and stirred to foam.

With respect to the amount of the foaming agent, when the concentration of the foaming agent in water is less than 5% by weight, the dispersion of the reinforcing fibers becomes non-uniform, and the fiber balls are formed by the entanglement of the fibers. If the strength is lowered, and if it exceeds 20% by weight, the foaming agent is segregated and the strength of the obtained molded article is lowered.
Limited to ~ 20% by weight. ..

In the second step of the second invention,
The reinforcing fiber is added to and mixed with the mixture obtained in the first step. When the amount of the reinforcing fiber added is less than 5 parts by weight with respect to 100 parts by weight of the hydraulic inorganic substance, the reinforcing effect such as improvement in tensile strength is small, and when it exceeds 25 parts by weight, the fiber is entangled due to the entanglement of fibers by the method of the present invention. -Because a ball is formed and the strength of the obtained molded article decreases,
Limited to 25 parts by weight.

The mixing method and kneading method used in the second step are not particularly limited, and any conventionally known mixer and kneader can be used. Next, in the third step, 100 parts by weight of a hydraulic inorganic substance and 1 to 1 of the water-soluble polymer powder are added to the mixture obtained in the second step.
Add 5 parts by weight, mix and knead.

The water-soluble polymer powder added in the third step may be the water-soluble polymer powder added in the first step. The water-soluble polymer added in the third step is a bonding agent for absorbing excess water in the hardened cement body and filling voids between cement particles, so it needs to be added as a powder. If the amount is less than 1 part by weight with respect to 100 parts by weight of the hydraulic inorganic substance, the strength of the obtained molded article decreases, and if it exceeds 5 parts by weight, the water resistance of the obtained molded article decreases, so that 1 to 5 parts by weight. Limited to

In the third step, an inorganic filler may be added in addition to the hydraulic inorganic substance powder and the water-soluble polymer powder. As the inorganic filler, those listed as the inorganic filler added in the first step can be used. The inorganic filler may be the same as or different from the inorganic filler added in the first step. Further, they may be used alone or in combination of two or more kinds. The addition amount of the above inorganic filler is 2 with respect to 100 parts by weight of the hydraulic inorganic substance.
If the amount exceeds 00 parts by weight, the strength of the obtained molded article decreases, so the amount is preferably 200 parts by weight or less.

The mixing method and kneading method used in the third step are not particularly limited, and any conventionally known mixer and kneader can be used. The method for producing a fiber-reinforced hydraulic inorganic molding of the present invention 3 is characterized in that a kneaded product comprising the composition obtained by the production method of the present invention 1 or the present invention 2 is subjected to vibration pressure molding. The vibration pressure molding in the second aspect of the present invention is to supply the composition obtained by the production method of the present invention into a pressing mold and perform the pressure molding while vibrating the mold.

The pressing die used in the manufacturing method of the present invention 3 is a conventionally known pressing die to which a conventionally known vibrator is attached, and the pressing die and the mixture supplied into the pressing die are used. In order to give a slight vibration to the three-dimensional direction, and to give effective thixotropic effect to the kneaded material,
It is preferable to give a frequency of 100 to 10,000 Hz with an amplitude of 500 μm. An example of a device that can be used for the above-mentioned vibration pressure molding is a vibration press molding machine described in the Aichi Tokoname Ceramics Technology Center-Research Results Report in 1988.

The method for producing the fiber-reinforced hydraulic inorganic molding of the present invention 4 is as follows. The composition obtained by the production method of the present invention 1 or the invention 2 is extruded and then pressed to obtain a molded article having a desired shape. It is characterized by being shaped into. As the extruder used in the present invention, any conventionally known one can be used, and the continuous molded body obtained by this is cut into a required size and supplied to a pressing mold, which is pressed. By doing so, a molded article having a desired shape can be formed.

The fiber-reinforced hydraulic inorganic molded articles obtained by the methods of the present invention 3 and the present invention 4 are, for example, press-molded during molding if a hydraulic inorganic material having a fast curing rate such as gypsum is used. It can be cured at the same time as molding by heating at the time of molding, and the resulting molded body may be naturally cured over time, but water with a slow curing reaction, such as Portland cement, can be used. When using a hard inorganic substance, by heating the molded body, humidification, etc., by performing curing by a conventionally known method,
It goes without saying that the curing reaction can be accelerated and the mechanical properties can be improved.

[0039]

EXAMPLES The details of the present invention will be described in more detail with reference to Examples. Examples 1 to 5 and Comparative Example 1 First step: Hydroxypropylmethylcellulose (a 2% aqueous solution having a viscosity of 30,000 cps at 20 ° C.) was added to a predetermined amount of water shown in Table 1 or Table 2. Or polyvinyl alcohol (trade name; PA-18, manufactured by Shin-Etsu Chemical Co., Ltd.)
In an aqueous solution in which S) is dissolved, fly ash having an average particle size of 100 μm (true specific gravity 2.3, bulk specific gravity 0.6), or J
IS9 silica sand (average particle size 100 μm) was added and mixed.

Second step: Pour the mixture obtained in the first step into an omni-mixer having a volume of 5 liters, a vinyl denier having a thickness of 2 denier and a length of 6 mm, or a thickness of 2 denier.
And polypropylene fiber having a length of 6 mm were added, and the mixture was subjected to rocking mixing for 5 seconds.

Third step: The mixture obtained in the second step was placed in a mixer having a capacity of 10 liters, and ordinary Portland cement, hydroxypropylmethylcellulose (2
Fly ash with a 2% aqueous solution having a viscosity of 30,000 cps at 0 ° C. and a particle size of 100 μm (true specific gravity: 2.
3, bulk specific gravity of 0.6) or JIS No. 9 silica sand was added and mixed for 2 minutes. After that, they were kneaded with a clay kneader and integrated.

The kneaded material obtained in the above first to third steps is molded by a vibration press molding machine at a pressing pressure of 20 kg / cm ² , a frequency of 1,000 Hz and an amplitude of about 10 μ to obtain a fiber reinforced cement molded product. It was

Examples 6 to 10 and Comparative Example 6 The kneaded products obtained in the same manner as in Examples 1 to 5 and Comparative Example 1 were extruded by a vacuum extrusion molding machine and molded into a plate-shaped continuous molding having a width of 400 mm. This was cut into a length of 600 mm, and this was molded with a hydraulic press molding machine at 80 kg / mm ² to obtain a fiber-reinforced cement molded body.

Examples 11 to 15 and Comparative Example 2 First step: A foaming agent (trade name; manufactured by Takenaka Yushi Co., Ltd .; Air-Set, or Sun Orient Chemical) in a predetermined amount of water shown in Table 1 or Table 2. An aqueous solution prepared by adding and dissolving (trade name: Glufoam, manufactured by the company) was stirred with a whisk to generate bubbles.

Second step: The mixture obtained in the first step was placed in a mixer having a capacity of 10 liters, and the thickness was 2 denier,
Vinylon fiber having a length of 6 mm or polypropylene fiber having a thickness of 2 denier and a length of 6 mm was added and mixed for 3 minutes.

Third step: To the mixture obtained in the second step, ordinary Portland cement, hydroxypropylmethylcellulose, fly ash and silica sand were added and mixed for 2 minutes. After that, they were kneaded with a clay kneader and integrated.

The kneaded material obtained in the above first to third steps is molded by a vibration press molding machine at a pressing pressure of 20 kg / cm ² , a frequency of 1,000 Hz, and an amplitude of about 10 μ to obtain a fiber-reinforced cement molded product. It was

Comparative Examples 3 to 5 Portland cement, hydroxypropylmethylcellulose, fly ash, and vinylon fibers in the predetermined amounts shown in Table 2 were mixed for 3 minutes, water was added, and the mixture was mixed again for 2 minutes. A mixture was obtained. Next, the obtained mixture was molded by a vibration press in the same manner as in Example 1 to obtain a fiber-reinforced cement molded product.

Comparative Examples 7 to 9 Mixtures were obtained in the same manner as in Comparative Examples 3 to 5, and extruded in the same manner as in Example 6 using a vacuum extrusion molding machine to form a plate-shaped continuous compact, and the hydraulic pressure was applied. Molded by a press molding machine to obtain a fiber-reinforced cement molded body.

As described above, Examples 1 to 15 and Comparative Example 1 obtained
The molded bodies of Nos. 9 to 9 were cured at 60 ° C. and 90% RH for 6 hours, cut to obtain test pieces, and subjected to the following tests. The above results are also shown in Tables 1 and 2.

[0051]

[Table 1]

[0052]

[Table 2]

Evaluation of physical properties Fiber dispersibility The obtained molded body was cut, and the fracture surface was observed with a microscope to visually determine the dispersed state of the fibers, and evaluated according to the following criteria.

◯: The fibers are completely dispersed and no aggregation is observed. Δ: Fibers are dispersed for a while, but some aggregation is observed. X: Remarkably aggregated. Bending Strength The bending strength of the obtained molded body was measured according to the method of JIS A 1408.

[0055]

As described above, the method for producing the fiber-reinforced hydraulic inorganic composition of the present invention 1 to 20-35 parts by weight of water,
Obtained in the first step of adding 1 to 20 parts by weight of the inorganic filler to an aqueous solution in which 0.1 to 0.5 parts by weight of the water-soluble polymer substance is dissolved or is being dissolved, and the first step A second step of adding 5 to 25 parts by weight of reinforcing fibers to the obtained mixture and performing oscillating mixing, and a mixture obtained in the second step,
A third step of adding 100 parts by weight of a hydraulic inorganic substance and 1 to 5 parts by weight of a water-soluble polymer powder, mixing and kneading the mixture is appropriately adjusted by the first step. The inorganic filler particles are easily added between the oscillatingly mixed reinforcing fibers that have been added in the second step into the aqueous solution of the water-soluble polymer substance having different viscosities to help the reinforcing fibers to disperse and aggregate. In order to prevent entanglement, the reinforcing fibers are dispersed in a large amount and evenly without being damaged or cut.

Further, in the third step, powders such as a hydraulic inorganic substance and an inorganic filler are added between the inorganic filler and the reinforcing fibers which are dispersed in a viscous aqueous solution in a stable state. Since they are mixed, not only particles of hydraulic inorganic substance and the like are easily and uniformly dispersed, but also reaggregation and entanglement of the reinforcing fibers can be prevented and a uniform state can be maintained.

In the method for producing the fiber-reinforced hydraulic inorganic molding of the present invention 2, as described above, the foaming agent is dissolved in 20 to 35 parts by weight of water so that the concentration of the foaming agent becomes 5 to 20% by weight. Then, the first step of stirring and foaming, the second step of adding 5 to 25 parts by weight of reinforcing fibers to the mixture obtained in the first step and mixing, and the second step of obtaining To the given mixture,
A third step of adding 100 parts by weight of a hydraulic inorganic substance and 1 to 5 parts by weight of a water-soluble polymer, mixing them, and kneading them together is carried out in an aqueous solution appropriately foamed by the first step. In addition, in order to assist the dispersion of the reinforcing fibers added in the second step and prevent aggregation and entanglement, the reinforcing fibers are dispersed in a large amount and uniformly without being damaged or cut.

Further, in the third step, powders such as a hydraulic inorganic substance and an inorganic filler are added and mixed between the reinforcing fibers dispersed in the aqueous solution in a stable state. Not only the particles such as inorganic substances are easily and uniformly dispersed, but also reaggregation and entanglement of reinforcing fibers can be prevented,
It is possible to maintain a uniform state.

The method for producing the fiber-reinforced hydraulic inorganic molded article of the present invention 3 is characterized in that the composition obtained by the method for producing the composition of the present invention 1 or the present invention 2 is subjected to vibration pressure molding. Therefore, it is effective for imparting thixotropy to a kneaded product formed from the composition of the present invention 1 or the present invention 2, and a kneaded product containing a large amount of reinforcing fibers, such as the present invention, has a molded article. It is possible to obtain a high-strength fiber-reinforced hydraulic inorganic molded product without impairing the surface properties of the above.

The method for producing the fiber-reinforced hydraulic inorganic molded article of the present invention 4 is as follows. The composition obtained by the method of producing the composition of the present invention 1 or the present invention 2 is extrusion-molded and then the desired shape is obtained by press molding. Therefore, a kneaded product containing a large amount of reinforcing fibers, such as a kneaded product comprising the composition of the present invention 1 or the present invention 2, can be formed into a molded article of A high-strength fiber-reinforced hydraulic inorganic molded product can be obtained while maintaining dispersibility.

Therefore, according to the production method of the present invention, a large amount of reinforcing fibers can be mixed and uniformly dispersed in the hydraulic material matrix even when water is mixed in a relatively small amount. It is possible to provide a fiber-reinforced hydraulic inorganic molding having uniform strength and maximizing the reinforcing effect of fibers. Fiber-reinforced hydraulic inorganic molded body by the production method of the present invention, by selecting the reinforcing fiber according to the desired physical properties, it is possible to obtain a high-strength molded body, it is also possible to impart flexibility, It can be particularly suitably used for building materials such as floor materials, inner wall materials, outer wall materials, and roof materials.

Claims (4)

[Claims] 1. 1 to 20 parts by weight of an inorganic filler is added to and mixed with an aqueous solution in which 0.1 to 0.5 parts by weight of a water-soluble polymer is dissolved in 20 to 35 parts by weight of water. To the mixture obtained in the first step, and the second step in which 5 to 25 parts by weight of reinforcing fibers are added to the mixture obtained in the first step to perform oscillating mixing. , Hydraulic inorganic substance 100
A third step of adding 1 part by weight to 1 to 5 parts by weight of a water-soluble polymer powder, mixing and kneading the mixture, and a method for producing a fiber-reinforced hydraulic inorganic composition. 2. A foaming agent concentration of 5 to 20 to 35 parts by weight of water.
First step of dissolving the foaming agent to ˜20% by weight, stirring and foaming, and adding 5 to 25 parts by weight of reinforcing fiber to the mixture obtained in the first step and mixing. And the mixture obtained in the second step, the hydraulic inorganic substance 100
Parts by weight, 1 to 5 parts by weight of the water-soluble polymer are added and mixed,
And a third step of kneading, which is a method for producing a fiber-reinforced hydraulic inorganic composition. 3. A method for producing a fiber-reinforced hydraulic inorganic molding, which comprises subjecting the composition obtained by the method according to claim 1 or 2 to vibration pressure molding. 4. A fiber-reinforced hydraulic material, characterized in that the composition obtained by the production method according to claim 1 or 2 is extrusion-molded and then shaped into a molded article having a desired shape by press molding. Method for manufacturing inorganic molded body.