JP2000043020A - Production of hydraulic inorganic molding - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for producing a three-dimensional hydraulic material mixture molding having a complex shape and a pattern which can be used without being coated. SOLUTION: In a method for producing a hydraulic inorganic molding in which a hydraulic material mixture of a hydraulic material, aggregate, a thickener, and water is placed in a form, pressurized, molded in a prescribed shape, and demolded, before the mixture being placed in the form, a thermoplastic resin film is arranged on at least one surface among surfaces which contact the mixture in the form, and the mixture is demolded so that the film is adhered to the surface of the hydraulic inorganic molding.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to an outer wall material, a roof material,
The present invention relates to a method for industrially producing a hydraulic material mixture molded product used for a building material mainly used as a base material such as an interior material and a fence material and having a complicated pattern and shape. More specifically, the present invention relates to a method for producing a molded article having a complicated shape, which can be used without painting, mainly using a colored hydraulic material mixture as a raw material.

[0002]

2. Description of the Related Art In general, a plate-shaped hydraulic inorganic molded product is prepared by adding various materials and water to a hydraulic material such as cement, mixing with a mixer, kneading with a kneader, and a hopper of a vacuum extruder. The mixture is put into a mouth, and extruded while being shaped with a die having a predetermined shape while deaeration of the hydraulic material mixture in a vacuum extruder.

[0003] In order to form a highly designable pattern such as an uneven pattern on the front side of a plate-shaped hydraulic inorganic molded article obtained by extrusion molding, an embossing roll or the like for giving an uneven pattern near the die exit is required. A method of transferring an uneven pattern by installing and pressing a molded body with an embossing roll, or an embossing roll for applying an uneven pattern on a conveyor or tray after shaping into a plate shape And a method of transferring an uneven pattern.

[0004] This method is suitable for a simple plate-shaped flat rectangular molded product. For example, in the case of an outer wall material having a complicated shape such as a plate-shaped roof material, a split stone tone, a stone masonry tone, a horse stepping joint, etc. There is a limit in molding, shaping, and patterning. In particular, a plate-like roofing material often does not have a flat rectangular shape, and when cut out from a plate-like molded body, a loss of several tens% occurs. In addition, since the tiled roof material has a three-dimensional shape, it cannot be formed by this method.

[0005] In order to form a molded article having a complicated pattern or shape, a mold is formed using a mold and a press. In mold molding, an oil-based release agent is used in order to facilitate demolding of a molded body, or a hydraulic material mixture having a low moisture content and a high density is used as a raw material.
On the other hand, the hydraulic material mixture after kneading with a kneader loses uniformity of product performance (mechanical strength and durability) because air is entrapped in the mixture, and the hydraulic material mixture is Since the viscosity is so high that it cannot be easily degassed by putting it in a vacuum chamber and evacuating it, use an extruder equipped with a vacuum deaeration function and put the hydraulic material mixture kneaded by the extruder into a mold. Has been done. When kneading a hydraulic material mixture with an extruder, it is common to add a thickener because the hydraulic material mixture runs idle in the extruder and cannot be extruded unless the hydraulic material mixture is given viscosity. It is. Then, when the hydraulic material kneaded by the extruder is put into a mold, there is a problem that it is difficult to remove the molded body because the thickener adheres to the mold.

[0006] Furthermore, asbestos having both the function of increasing viscosity and the property of retaining water, which is very effective for extrusion molding, has been approved for its carcinogenicity and its use has been limited. It is in the direction of reducing usage. When the amount of asbestos used is reduced, the water retention is reduced, and the porosity of the hydraulic material molded body is reduced by that amount, resulting in a material having a high density. In order to reduce the density of the material, it is necessary to increase the amount of water-retaining pulp, and with pulp alone, the shearing force of the material required for extrusion molding is insufficient and the screw runs idle, so a thickener is also used There is a need. In particular, in extrusion molding using no asbestos as in the present invention, pulp containing a lot of air must be used a lot, and furthermore, water retention and viscosity are maintained, and the shearing force of the material is kept high. I have to use a lot of thickeners. For reasons of concern, especially when using hydraulic material mixtures with a high water content and a low specific gravity, it is necessary to add a large amount of thickener, which increases the adhesion between the mold and the hydraulic material mixture. Moreover, it is difficult to remove the molded product from the mold.

On the other hand, when a hydraulic material is mixed with water and mixed, molded and cured, the hydraulic material is cured while releasing calcium hydroxide in the course of the progress of the hydraulic reaction, thereby increasing the strength. However, surplus calcium hydroxide generated during hardening, sodium, potassium, and the like contained in the cement form a white substance called efflorescence on the surface of the molded body. This is referred to as the efflorescence phenomenon of cement.

[0008] Efflorescence not only impairs the aesthetics of the molded product, but also lowers the coating film adhesion and coating durability of surface coating performed on building exterior wall materials, roofing materials and the like. Further, when the release agent is used, the release agent is unevenly distributed, and the adhesion of the coating film on the surface coating and the coating durability are locally reduced, and the long-term durability is alienated. Also, by adding a coloring agent to the hydraulic material mixture, if it is used as a base material for exterior walls, roofing materials, blocks, walls, gateposts, alternative bricks, etc. without coating, there is no problem in performance. Nevertheless, efflorescence extremely disturbs the color tone, which is the basis of design, resulting in a low-grade appearance, making it difficult to put it to practical use in Japanese architecture where emphasis is placed on aesthetics.

As described above, the efflorescence generated during the manufacturing process is removed by a method such as washing with high-speed water or shaving off with an abrasive or a polishing machine. However, it is still very difficult to completely remove the color disturbance caused by the generated efflorescence. Furthermore, the process of removing efflorescence increases costs and causes a reduction in product productivity. Therefore, in order to prevent the occurrence of efflorescence, a method of adding amorphous silica to a hydraulic material mixture (JP-A-55-75957).
Japanese Patent Application Laid-Open No. 53-59714) and a method of subjecting a molded article to carbon dioxide treatment (Japanese Patent Application Laid-Open No. 53-59714).

[0010]

The efflorescence cannot be sufficiently prevented only by adding amorphous silica to the hydraulic material mixture. In addition, the method of performing carbon dioxide treatment can prevent vitiligo, but in order to generate a thick and dense layer of calcium carbonate on the surface, especially in the case of a molded product containing a coloring agent, the overall color, Efflorescence, which looks fading, cannot be prevented. The present invention relates to a method for producing a molded article having a complicated shape by using a mold while preventing efflorescence generated in an industrial production process of a hydraulic inorganic molded article.

[0011]

The inventor of the present invention has conducted intensive studies in order to solve the problems of demolding and efflorescence in the molding of the mold. It has been found that not only both problems can be solved by interposing a thermoplastic resin film between them, but also that color development can be further enhanced, and the present invention has been achieved.

That is, the gist of the present invention is that a hydraulic material mixture obtained by mixing a hydraulic material, an aggregate, a thickener and water is put into a mold, and a predetermined pressure is applied to the inside of the mold. In the method for producing a hydraulic inorganic molded article after shaping into a shape and removing the hydraulic material mixture, at least one of the surfaces of the mold that comes into contact with the hydraulic material mixture before the hydraulic material mixture is put into the mold. The present invention resides in a method for producing a hydraulic inorganic molded article, comprising disposing a thermoplastic resin film on one surface and removing the thermoplastic resin film from the surface of the hydraulic inorganic molded article so that the thermoplastic resin film adheres to the surface.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail.
Examples of the hydraulic material used in the present invention include inorganic materials having hydraulic properties such as cement and gypsum, and cement is preferably used. As cement, ordinary Portland cement, early strength Portland cement, low heat cement,
Examples include blast furnace cement, fly ash cement, alumina cement and low shrinkage cement.

The aggregate used in the present invention includes coarse aggregates, fine aggregates, lightweight coarse aggregates, lightweight fine aggregates, lightweight aggregates, and the like. Specific examples are sand, stone, shirasu balloon, and pearlite. ,
Foams and the like. Preferably, the average particle size is 4 μm
Aggregates of ５5 mm are used. The amount of the aggregate is usually 1 to 200 parts by weight, preferably 80 to 120 parts by weight, based on 100 parts by weight of the hydraulic material.

As the thickening agent used in the present invention, a polymer having a solubility in water at 25 ° C. of usually 0.5 g / 100 ml or more, which is generally called a water-soluble polymer, is used. And cellulose derivatives such as carboxymethylcellulose and hydroxyethylcellulose, and polyvinyl alcohol and polyacrylamide. Cellulose derivatives, particularly methylcellulose, hydroxyethylcellulose and hydroxypropylmethylcellulose are preferably used from the viewpoints of viscosity imparting and flow control. The compounding amount of the thickener is usually 0.5 to 10 parts by weight, preferably 1 to 4 parts by weight, per 100 parts by weight of the hydraulic material. By blending a water-soluble polymer, even a hydraulic inorganic material mixture containing a large amount of water can maintain a high shearing force of a material necessary for extrusion molding, and can also obtain a hydraulic mineral material. It is possible to give the molded article a dark and deep coloration.

The amount of water is usually 30 to 200 parts by weight, preferably 50 to 1 part by weight, per 100 parts by weight of the hydraulic material.
00 parts by weight. Further, the hydraulic material of the present invention, aggregate,
The composition obtained by mixing the thickener and water may contain a siliceous raw material, a calcareous raw material, a reinforcing fiber, a coloring agent, a molding aid, and the like.

The siliceous raw material may be either amorphous or crystalline. Specifically, silica sand, diatomaceous earth,
Natural products such as silica stone, quartz, minerals containing silica, clay minerals, gravel, crushed stone, and activated clay are included. Also, industrial by-products such as silicon dust may be used. When a siliceous material is added, the mechanical strength and durability of the cement molding can be improved, so that it is preferably used. The amount of the siliceous raw material is usually 20 to 100 parts by weight of the hydraulic material.
It is 150 parts by weight.

Examples of calcareous raw materials include quicklime and slaked lime. The amount of the calcareous material is 10
It is usually 0 to 50 parts by weight with respect to 0 parts by weight. As the reinforcing fibers, known fibrous substances such as natural fibers such as pulp, inorganic fibers such as glass fibers and carbon fibers, and organic fibers such as polypropylene fibers can be used. These may be used alone or as a mixture of two or more. By blending the reinforcing fibers, the mechanical strength of the obtained molded article can be improved. The compounding amount of the reinforcing fiber is usually 0.5 to 20 parts by weight based on 100 parts by weight of the hydraulic material.

As the coloring agent, any of an organic coloring agent and an inorganic coloring agent can be used. However, in the case of performing autoclave curing and considering heat resistance, weather resistance and environmental pollution as a building material, inorganic coloring agents such as pigments are used. Colorants are preferred. The amount of the coloring agent is usually 0.1 to 100 parts by weight of the hydraulic material.
1 to 20 parts by weight. Examples of the forming aid include assistants such as a water repellent, a water reducing agent, a modifier, a setting agent, a setting retarder, an adhesion improver, and various organic or inorganic recycled materials.

After dry-blending solid materials such as hydraulic materials, aggregates, and thickeners with a mixer, liquid materials such as water are added and kneaded, and then further kneaded with a kneader. Put into the hopper opening. The thickener and various molding aids may be dissolved in water in advance and added to the solid raw material dry-blended with water.

In a vacuum extruder, while the air mixed in the hydraulic material mixture is deaerated, the air is usually extruded with a round bar-shaped or square plate-shaped die, and the amount filled in the mold is 2 to 30 times.
%, Preferably 5 to 10%, is cut at the stage of extrusion, and the cut mass of the hydraulic material mixture is poured into an opened mold, usually the inner surface of a lower mold. A thermoplastic resin film is previously mounted on the upper and lower molds on the inner surface of the mold, that is, on the surface in contact with the hydraulic material mixture. In the lower mold, the inner surface of the lower mold, the thermoplastic resin film, and the hydraulic material mixture are arranged in this order. A thermoplastic resin film is also mounted on the inner surface of the upper mold in advance.

The thermoplastic resin film may be in close contact with at least one surface of the molded article. It may be in close contact with only the upper surface and the lower surface, or may be in close contact with the entire surface of the molded body. Adhere the thermoplastic resin film only to the upper and lower surfaces of the molded body,
By not using a thermoplastic resin film on the side surface, a movable nest can be provided on the side surface of the die to obtain a block-shaped molded body with holes.

The thermoplastic resin film used in the present invention comprises:
The thickness is usually 5 μm to 3 mm, preferably 10 to 400
μm film. The material of the film is flexible and may be anything that adheres to the molded body of the hydraulic material mixture, but in consideration of peeling after curing or in the final use form as a building material, the thermoplastic resin film is used. Used. Preferably, polyethylene, polypropylene,
Polyvinyl chloride, ethylene vinyl copolymer (EV
A), polyamide, polyethylene terephthalate (PE
Any film may be used as long as it is easy and inexpensive, such as T).

The surface of the thermoplastic resin film which is in contact with the uncured molded body should be preliminarily treated with a material which adheres or adheres to the uncured molded body in order to maintain the adhesion and holding properties with the molded body. Is preferred. Examples of such a material that adheres or adheres to the uncured molded body include a water-soluble adhesive and a water-soluble adhesive, and specifically, polyvinyl alcohol, isobutene-maleic anhydride copolymer, Polyvinyl pyrrolidone, acrylic acid, acrylic copolymer, vinyl acetate copolymer, vinyl acetate emulsion, polyacrylamide, gum arabic, dextrin, polyethylene oxide, natural rubber, SBR, butyl rubber, starch alone or in combination, Anti-solidification agent,
Adhesives and pressure-sensitive adhesives to which glycerin, glycols, boric acid, borax, and the like are added are exemplified. The material that adheres or sticks to these uncured molded bodies can be coated on the film surface by a method such as lamination or roll coating.

The thermoplastic resin film has a pattern of a molded article,
When it can be shaped according to the shape, it can be used as it is as a film, but in the case of a molded body having a complicated pattern or shape or a deeply carved pattern, the film can not follow the pattern or shape When cutting, wrinkling, or the like occurs, it is preferable to use a film obtained by shaping a film into a desired pattern or shape or a deep engraved shape by vacuum or pressure molding in advance.

As in the case of the hydraulic material mixture used in the present invention, a thickener is added to improve the extrudability and the like, and in the case of a viscous material, the molded body sticks to the mold, and furthermore, Since the hardness is not sufficient, there arises a problem that the protrusion pin breaks through the molded body. Therefore, conventionally, a method has been adopted in which the same number of molds as the number of products are prepared, molded while exchanging the molds, and cured together with the mold, but in the present invention, the surface of the uncured molded body is heated. Since the plastic resin sheet is stuck, at the uncured stage, it becomes possible to take out the molded body from the mold, basically, only one mold is required,
Therefore, there is no need to prepare a large number of expensive molds, and there is no need for a process of handling heavy objects such as exchanging and moving the entire mold, and the space for curing is only required for the molded body.

Next, the upper and lower molds are put together and the molds are closed. The closed form is placed on a vertically driven hydraulic or mechanical press to apply pressure within the form. It is preferable to provide air vents in the upper and lower molds. In addition, it is preferable that the lower mold has a mechanism in which a protruding pin operates so that the molded body can be taken out of the mold. The pressurizing time in the mold is usually 3 seconds to 1 minute, and 10 to 90 seconds is preferable in consideration of productivity. The pressure to be applied is usually ^{2 to} 100 kg / cm ² , preferably 5 to 20 kg / c.
m ² .

It is preferable to prepare a mold so as to normally obtain 1 to 10 molded bodies with one mold in order to match the extrusion amount of the vacuum extruder with the mold volume. The uncured hydraulic inorganic molded body is then removed from the mold. When removing the molded article from the mold, the thermoplastic resin film is prevented from peeling off from the molded article.
The thermoplastic resin film is in close contact with the surface of the obtained uncured hydraulic inorganic molded article because it is pressurized. Since the thermoplastic resin film is in close contact with the molded article, the molded article can be easily removed from the mold, and handling is good.

The uncured hydraulic inorganic molded article thus obtained is then cured. Curing is usually performed at room temperature or humidification, preferably at 50 to 80 ° C and a humidity of 8
It is carried out by leaving it for 5 to 10 hours under the condition of 0 to 95% and normal pressure. Hereinafter, curing under such conditions is referred to as “primary curing”. The primary curing is performed while keeping the thermoplastic resin film in close contact with the surface of the molded article. The primary curing of the hydraulic material mixture while preventing moisture, air, carbon dioxide, etc., which promotes the efflorescence phenomenon, can prevent the occurrence of efflorescence and prevent the molded article from discoloring.

In addition, since the thermoplastic resin film is brought into close contact with the surface of the hydraulic inorganic molded article to prevent drying of the uncured molded article after demolding, the standing time until curing is prolonged. And also functions to prevent cracks and minute cracks in the molded body due to careless drying. This is particularly useful during the dry season in winter.

When only the primary curing is performed and then the secondary processing such as cutting is performed as required to obtain a final product, the thermoplastic resin film adhered to the surface of the molded body is processed,
The protective film can serve as a protective film for protecting the molded body from damage during transportation. After primary curing, if necessary,
Carry out secondary curing by autoclaving under high temperature and pressure. When secondary curing is performed, the secondary curing is performed after the thermoplastic resin film is peeled off, unless a film that can withstand high temperature and pressure conditions such as a Teflon film is used as the thermoplastic resin film. Secondary curing is usually 1
30 to 180 ° C, usually 3 to 1 at 3 to 10 atm
This is performed by processing for 0 hours.

The thus obtained hydraulic inorganic molded article does not have white spots due to efflorescence, and has a color difference of +1.0 or less determined by the following color difference measuring method. In addition, when white spots due to efflorescence occur, the color difference usually exceeds +4.5.

<Method of Measuring Color Difference> The measurement of the color difference requires a reference surface in addition to the measurement surface on the measurement sample. As the reference plane, a part of the measurement sample was cut, and the cut plane was used as the reference plane. The color difference is obtained by measuring L ^* , a ^* , and b ^* between the reference plane and the measurement plane using a color difference meter, calculating ΔE from equation (1), and calculating +, − according to the value of L ^* between the reference plane and the measurement plane. It can be obtained by attaching one of the symbols.

[0034]

ΔE = {(L0 ^* −L1 ^* ) ² + (a0 ^* −a1 ^* ) ² (b0 ^* −b1 ^* ) ² } ^1/2 Equation (1)

(Where L0 ^* , a0 ^* , and b0 ^* are L ^* , a ^* , and b ^* of the measurement surface, and L1 ^* , a1 ^* , and b1 ^* are:
L ^* , a ^* , and b ^* of the reference plane are represented. ) When L0 ^* > L1 ^* , the numerical value obtained by equation (1) is-
And L + ^* when L0 ^* ≦ L1 ^* . ΔE obtained by Expression (1) represents a change in color tone between the reference surface and the measurement surface.

Since the efflorescence is white, the color becomes lighter and the color becomes brighter when the efflorescence occurs. Therefore, when L0 ^* indicating the brightness of the measurement surface is larger than the brightness L1 ^* of the reference surface, + is added, and when L0 ^* is smaller, −
And -Means that the color becomes darker, indicating that no efflorescence occurs.

[0037]

EXAMPLES The present invention will be described below with reference to examples, but the present invention is not limited to the following examples unless it exceeds the gist. <Example 1> 100 parts by weight of ordinary Portland cement (manufactured by Chichibu Onoda), 100 parts by weight of silica stone (“MS35” manufactured by Chichibu Kogyo), 6 parts by weight of black pigment, and 4 parts of inorganic pigment of brown
After thoroughly mixing a mixture of 3 parts by weight of methylcellulose, 3 parts by weight of methylcellulose and 6 parts by weight of waste paper pulp with a mixer, 70 parts by weight of water was added and kneaded sufficiently until the mixture became uniform. The obtained hydraulic material mixture is put into a vacuum extruder having a diameter of 80 mm, extruded from a plate-like die (150 mm wide, 38 mm thick), and a board of 155 mm wide and 40 mm thick is extruded. It was cut at a length of 400 mm.

455 mm long, 910 mm wide, 6.5 thick
A 70-ton hydraulic press is used to set a roof tile-shaped mold with a vertical stripe pattern on the upper mold surface, and the lower mold with the mold opened is a water solution containing polyvinyl alcohol as a main component. 1000m with 100μm thickness coated with adhesive
A low-density polyethylene film of mx 500 mm square was mounted so that the water-soluble adhesive was on the upper surface.

Next, a board of the above-mentioned hydraulic material mixture was placed on the film, and an upper mold was prepared in which the same film as the one mounted on the lower mold was mounted with the water-soluble adhesive on the lower surface. . The upper and lower molds were slowly closed by operating the hydraulic pump. When the molds were completely closed, a small amount of the hydraulic material mixture overflowed from four sides. After pressurizing for 10 seconds, the mold was opened, the ejector pins were actuated, and the molded article formed into a roof tile shape in which the film was in close contact with the upper and lower surfaces was taken out. FIG. 1 shows a top view of the shape of the obtained molded body.

Since the thermoplastic resin film is transparent,
It was confirmed that no air was caught between the molded body and the film. The removed molded body was gently placed on a plate, inserted into a constant temperature / humidity oven at a temperature of 60 ° C. and a humidity of 95%, and subjected to primary curing for 6 hours. The molded body after the primary curing was sufficiently cured, and had a good hadling property. Furthermore,
The films on the upper and lower surfaces of the molded body after the primary curing were peeled off, and dried for 1 hour with a ventilation dryer. Next, the surface of the molded body was cut by a thickness of 3 mm to serve as a reference plane, and the upper and lower surfaces of the molded body were taken as measurement planes.
0 ”), L ^* , a ^* , and b ^* were measured to determine the color difference.

Next, the molded body after the color difference measurement was subjected to secondary curing in an autoclave at a saturated steam pressure of 160 ° C. for 6 hours. After the secondary curing, the color difference was determined in the same manner as after the primary curing. As the reference surface for obtaining the color difference after the secondary curing, the surface that was secondary cured from the reference surface used for obtaining the color difference after the primary curing was used. Table 1 summarizes the results after color difference measurement
Shown in

The measurement surface after the primary curing had a deeper color than the reference surface, but the measurement surface after the secondary curing became slightly whitish. However, the reference surface was slightly whitish due to the secondary curing in the autoclave, so that the color was almost the same. In addition, a high silicone acrylic resin-based clear paint was applied to the measurement surface after the secondary curing, and the color difference was measured when a glossy molded body was obtained.

Example 2 Silica (“MS7”) was added to 100 parts by weight of ordinary Portland cement (made by Chichibu Onoda).
5) 50 parts by weight of Chichibu Industrial Co., Ltd., activated clay (“Silt F”)
50 parts by weight of Marunouchi Shirato), 10 parts by weight of bengal tea (iron oxide), 2 parts by weight of methylcellulose, and 10 parts by weight of waste paper pulp are sufficiently stirred with a mixer, and 85 parts by weight of water are added until uniform. The mixture was sufficiently mixed and kneaded. The obtained hydraulic material mixture is charged into a vacuum extruder having a diameter of 80 mm,
A board of a hydraulic material mixture having a width of 300 mm and a thickness of 10 mm was extruded and cut into a length of about 150 mm.

Inner size 392 mm length x 192 mm width x 15
A cylinder having a depth of 0 mm was formed from a steel plate having a thickness of 20 mm to form a mold, which was mounted on a 70-ton hydraulic press. Next, a cement-based block having a length of 390 mm, a width of 190 mm, and a height of 100 mm was inserted into the cylindrical body, and a board of the above-described hydraulic material mixture was placed on the upper surface of the cement-based block. 400 mm x 2 with 30 µm thickness coated with water-soluble adhesive
A nylon film of 00 mm square was laminated with the water-soluble pressure-sensitive adhesive facing downward, and an epoxy resin mold having a sandstone pattern was laminated with the pattern surface facing downward. FIG. 2 shows a sectional view of this state.

The hydraulic pump was operated, and the mold was slowly closed until the thickness of the hydraulic material mixture placed on the cement-based block became equivalent to 5 mm. When the mold was completely closed, a small amount of the hydraulic material mixture overflowed from four sides. The mold was immediately opened at the stage when it was completely closed, and the molded body was taken out. The nylon film adhered to the surface of the molded body.

The removed molded body was inserted into a steam-fired curing room at a temperature of 80 ° C., and was subjected to primary curing for 10 hours. The molded product after the primary curing was integrated with the cement-based block in a sufficiently cured state, and had sufficient adhesive strength. The finished molded body was cross-shaped with a router to form a cross joint, with the film still in close contact. A cross-sectional view is shown in FIG.

The decorative block molded body is divided into five vertical stages and ten horizontal stages.
They were stacked in rows and arranged in a row, concrete was poured into the cavity of the block, and a fence was constructed. One week later, the film on the surface of the completed fence was peeled off to complete the construction. The surface of the fence was dark brown and the stonestone-like pattern was clear and had a magnificent stone-stone pattern. Furthermore, there was no efflorescence-like thing on the surface of the fence.

<Comparative Example 1> In Example 1, the hydraulic material mixture molded without providing a thermoplastic resin film was:
A hole was opened by the protruding pin, and the mold could not be removed properly. Therefore, a mold release agent (Donox C13S manufactured by Kobunshi Kagaku Kenkyusho) was sufficiently applied to a mold and molded. The completed molded body was subjected to primary curing and secondary curing as in Example 1, and the color difference was measured using the surface of the molded body as a measurement surface.

[0049]

[Table 1]

[0050]

According to the present invention, it is possible to provide a method for producing a three-dimensional molded product of a hydraulic material mixture having a complicated shape and pattern which can be used without painting.

[Brief description of the drawings]

FIG. 1 is a schematic view of a roof tile manufactured in Example 1.

FIG. 2 is a schematic side view showing a state of being pressed in Example 2;

FIG. 3 is a schematic diagram of a side surface of a molded body obtained in Example 2.

[Description of Signs] 1 Roof tile molded body 2 Extruded board of hydraulic material mixture 3 Nylon film roll coated with water-soluble adhesive 4 Sandstone-like patterned epoxy resin form 5 Cement-based block 6 Steel plate cylinder 7 Joints for router processing 8 Holes for nailing 9 Vertical stripes

Claims (5)

[Claims] 1. A hydraulic material mixture obtained by mixing a hydraulic material, an aggregate, a thickener, and water is put into a mold, and is shaped into a predetermined shape by applying pressure to the mold. In the method for demolding and producing a hydraulic inorganic molded article, before putting the hydraulic material mixture into the mold, at least one of the surfaces of the mold that comes into contact with the hydraulic material mixture has a thermoplastic resin. A method for producing a hydraulic inorganic molded article, comprising: disposing a film and releasing the thermoplastic resin film so that the thermoplastic resin film adheres to the surface of the hydraulic inorganic molded article. 2. The production of a hydraulic inorganic molded product according to claim 1, wherein the hydraulic material mixture is obtained by kneading a hydraulic material, an aggregate, a thickener and water with a vacuum extruder. Method. 3. The method for producing a hydraulic inorganic molded article according to claim 1, wherein the thermoplastic resin film is formed into a shape along a mold in advance. 4. The thermoplastic resin film according to claim 1, wherein the surface in contact with the hydraulic material mixture is a film previously treated with a material that adheres or sticks to the hydraulic material mixture. The method for producing a hydraulic inorganic molded article according to claim 1. 5. The method for producing a hydraulic inorganic molded article according to any one of claims 1 to 4, wherein the hydraulic inorganic molded article obtained by demolding is further cured.