JPH0380752B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a cement veneer mainly composed of cement without using ordinary aggregates such as sand and gravel, and a method for producing the same. More specifically, the present invention relates to a cement decorative board having an uneven upper surface and a method for manufacturing the same.

[Prior Art] The present inventor has discovered that although it does not contain any aggregate that is contained in conventional cement veneers, it does not crack or warp after molding and hardening, and has high density and strength based on the theory of slate formation. Patent application filed in 1982 regarding the manufacturing method of ultra-high compression unfired cement decorative board with
A patent application was filed under No. 119194.

This manufacturing method involves adding 3% to 10% water by weight of water-cement to Portland cement to make cement paste, placing the cement paste in a mold,
It is a method of molding while applying a pressure of 100Kg/cm ² to 1000/cm ² and deaerating the air in the cement paste, and at the time of molding, a natural or artificial design material is placed on the top surface of the cement paste, This method also allows the creation of designs by embossing or embedding on the top surface.

However, with this method, pores tend to remain inside the finished decorative laminate, and cracks may occur from these pores. Therefore, the present inventor has developed a method for manufacturing cement decorative laminates that improves this point. A patent application was filed under Japanese Patent Application No. 58-3328.

This manufacturing method involves mixing Portland cement with inorganic fine powder as a filler and reinforcing fibers, and kneading this mixture with water.
This is a method to obtain a decorative board by compression molding and curing at a pressure of cm ^2.A natural or artificial decorative material is laid on the inner bottom of the formwork and molded, and a pattern of the decorative material is placed on the top surface of the cement decorative board. This method also allows printing.

However, when trying to print patterns on decorative materials using the above method, the decorative materials must be set on the bottom of the formwork, and especially when trying to make a wide variety of decorative boards using a wide variety of decorative materials. When doing so, there was a drawback that it was troublesome to replace the design materials.

In addition, the present inventor devised a cement decorative board with Japanese paper attached to the upper surface without using adhesive from the latter manufacturing method of decorative board.
A utility model application was filed under No. 168465. This Japanese paper-applied cement decorative board is manufactured by laying Japanese paper on the inner bottom of a formwork, putting the kneaded material that will become the cement decorative board on top of it, applying pressure, and pressing the Japanese paper onto the top surface of the cement decorative board. .

[Problems to be Solved by the Invention] In view of the above points, the present inventors have discovered that if the design material is placed on top of the cement paste and then molded, the above-mentioned drawbacks can be solved and the spaces between the uneven plate materials can be solved. The present invention was completed based on the fact that if the above-mentioned Japanese paper is placed on the surface of the cement plate, it is possible to produce a cement decorative board with Japanese paper attached with an uneven pattern.

An object of the present invention is to provide a cement decorative board in which Japanese paper is attached to the top surface of the board by molding, and at the same time a concave-convex pattern, concave-convex letters, or a concave-convex figure is engraved on the board surface together with the Japanese paper, and a method for manufacturing the same.

[Means for Solving the Problems] In order to achieve the above object, the present inventor adopted a method of combining 600 to 4000 kg of Portland cement with Japanese paper attached to the upper surface, an inorganic filler, and reinforcing fibers.
The purpose is to form a cement decorative board by applying a pressure of ² cm to compression molding and then hardening the uneven printing plate from the Japanese paper.

Next, the present invention will be explained in detail in the order of steps based on FIG.

<Adjustment of cement glue> (Figure 1) Examples of inorganic fillers to be mixed with Portland cement include inorganic fine powders such as calcium carbonate and bentonite, and examples of reinforcing fibers include steel fibers, mineral fibers, and vegetable fibers. Examples include fibers and synthetic fibers. These mixing amounts are cement by weight ratio.
Based on 100 parts, the inorganic filler is selected in a range of 3 to 30 parts, and the reinforcing fiber is selected in a range of 0.1 to 15.0 parts. The purpose of the inorganic filler is to reduce voids in the cement decorative board, and the purpose of the reinforcing fibers is to prevent cracking of the molded product when demolding after compression molding, which will be described later.

The water added to these mixtures is mixed in an amount of 5 to 16 parts by weight based on 100 parts of cement in order to cause hydration of the cement and to facilitate molding of the kneaded product. The water at this time is preferably a 1 to 5% aqueous methylcellulose solution in order to increase the viscosity of the kneaded product and facilitate molding. The mixture to which water has been added is uniformly kneaded to form a cement paste 10.

<Filling into formwork and placement of plate materials> (Figure 1) Cement glue 10 mixed with the above weight ratio
is injected into the mold 11 having an open top, and is filled until the internal volume of the mold 11 is filled. Once the formwork 10 is filled with cement glue, Japanese paper 16 is placed on the top surface. Next, a plate material 12 having an uneven surface carved thereon is placed so as to cover the upper surface of the Japanese paper 16. This method of arranging the printing plates 12 allows the printing plates 12 to be easily replaced even if there are many types of printing plates.

As for the Japanese paper 16, various types of Japanese paper can be used, such as plain white paper, plain colored paper, and paper with colored patterns.

Desired patterns, letters, numbers, figures, etc. are previously engraved on the unevenness of the plate material 12. Although various known printing plates can be used as the printing plate 12, photosensitive printing is preferred because it can withstand the ultra-high-pressure compression molding of the present invention and can express fine line patterns with good reproducibility, and for reasons such as handling and cost. Polymer resin letterpress is preferred. This photosensitive resin letterpress is made by placing a negative film on which a desired pattern has been developed in advance on a photosensitive resin material.
After exposing the photosensitive resin material by irradiating the negative film with a chemical lamp, mercury lamp, etc. that emits abundant ultraviolet rays, it was washed out with water or solvent using a designated developing machine, and then dried with hot air. Finally, in order to increase the strength of the printing plate, it is obtained by post-exposure. Examples of photosensitive resin letterpress include letterpresses made from photosensitive resins with acryloyl groups as photosensitive groups (photosensitive nylon), photosensitive resins with diazo groups as photosensitive groups (presensitized plates), etc. .

<Compression molding> (Fig. 1) After the plate material 12 is placed, from above the plate material 12
The cement paste 10 in the formwork 11 is compression molded by applying a pressure of 600 to 4000 kg/cm ² . This pressure is appropriately selected from the above range depending on the blending ratio of cement paste, the purpose of the decorative board, etc., but it will cause a fixation effect due to hydration of the cement, resulting in a high density based on the theory of slate formation mentioned above. In order to produce strength, the lower pressure limit needs to be 600 Kg/cm ² . Further, the upper limit pressure is about 4000 kg/cm ² depending on the durability of the compression molding machine or the plate material 12.

The molded article 13 molded by this compression molding is
A portion of the plate material 12 corresponding to the recessed portion is processed to be embossed.

<Demolding and curing> (Figure 1) After demolding, the molded product 13 can be cured and cured at room temperature and normal pressure, but it is also possible to cure and harden it at a temperature of 40 to 100°C and a relative humidity of 60 to 100%. A method of curing in a humid environment or a method of curing the molded product by sealing it with a synthetic resin material or the like at a temperature of 40 to 100°C is preferable because it promotes hydration of the cement and speeds up the hardening of the molded product 13. .

<Resin impregnation> (Fig. 1) When the cured molded product 13' is microscopically observed,
There are voids on its surface, and its water absorption rate is 4-5%. Therefore, when the decorative laminate of the present invention is used as an exterior building material, the upper surface of the molded product 13' is Resin impregnation is performed.

As for the impregnation method, as shown in the figure, molded product 1
A method of soaking the entire part 3' in the resin liquid 14,
Methods such as spraying the entire surface or applying it with a roller are used. Examples of this resin liquid include thermosetting resin liquids such as urethane, acrylic, epoxy, and polyester. By this resin impregnation, a resin film is formed over the entire surface of the molded article 13'.

<Top surface treatment> (Figure 1) The molded product 13'' with the resin film formed is decorated with painting, printing, etc. on the top surface depending on the purpose, and then
The top surface is coated with eluent, etc., and the cement decorative board 1
It becomes 5.

Cement decorative board 15 obtained in this way
Because it is compression molded under ultra-high pressure, it has high strength and density, and the unevenness of the plate material 12 is clearly transferred, and because it does not go through a firing process, the washi paper remains in its original form without changing its color or appearance. It can be attached to the top surface of a decorative board, and can be used as a Japanese-style building material or a decorative item for a Japanese-style room.

[Effects of the Invention] As described above, according to the manufacturing method of the present invention, Japanese paper is placed on the top surface of the cement paste, and the printing plate is placed on top of that for compression molding, so that unevenness can be simultaneously formed in one press. You can attach Japanese paper with a . By this method, a Japanese paper-attached cement decorative board with an uneven upper surface and full of three-dimensional effect can be obtained.

[Example] The following example of the present invention will be described, but the example shown below is just an example and does not limit the technical scope of the present invention.

Example 1 White Portland cement is 100 parts by weight, and the specific surface area is determined by the Blaine method, which is a fineness test method.
15 parts of calcium carbonate at 10000cm ² /g, 7mm long
A mixture of 0.5 parts of acrylic fibers with a diameter of 2 μm was kneaded with a 2% aqueous solution of methylcellulose to prepare cement paste, and the inner dimensions were 110 x 30 x 6 mm with an open top.
filled into a steel formwork.

Next, a pale green plain Japanese paper was placed on top of the cement paste, and a plate material on which a geometric pattern made of fine lines was engraved was placed on top of the cement paste. In this example, the plate material is a photosensitive film created by taking a photo of a pre-designed pattern, making it into a negative film, and then pressing an alcohol-soluble photosensitive nylon layer onto the top surface of a thin iron plate via an adhesive layer. It is a photo-crosslinkable methylene bisacrylamide monomer that has acryloyl groups at both ends of the molecule by adhering to the resin material and irradiating it with a mercury lamp. After making the nylon molecule insoluble in alcohol by exposure, it can be used in an alcohol-based solvent. After washing with water and drying with hot air, it was obtained by post-exposure.

Thereafter, a pressure of 1000 kg/cm ² was applied to the top and bottom surface of the mold to compress and mold the cement paste, and at the same time press-bond plain light green Japanese paper. After demolding, the molded product was cured and then covered with a urethane film to obtain an interior material for Japanese-style architecture.

This decorative board had a bending strength of about 180 Kg/cm ² and a specific gravity of 2.35. This decorative board was placed in a JISA 1415 weathering meter and subjected to a 1200-hour weathering test using the shortened weathering test method, but the color of the washi paper attached to the top of the cement decorative board after the test was was the same as the original, and no discoloration was observed. In addition, the fine line patterns were clearly embossed, and there was no peeling from the washi paper molding.

[Brief explanation of drawings]

FIG. 1 is a block diagram for explaining the manufacturing method of the present invention. 10: Cement glue, 11: Formwork, 12: Plate material,
13, 13′, 13″: Molded product, 14: Resin liquid, 1
5: Cement decorative board, 16: Japanese paper.

Claims (1)

[Claims] 1. Cement paste is prepared by adding water to a cement material made by mixing Portland cement with inorganic filler and reinforcing fibers, and after putting this cement paste into a mold, Japanese paper is placed on the top surface of this cement paste. , and then place a plate material with unevenness on top of this washi paper.
Apply cement glue in this formwork to the plate material at a rate of 600 to 4000
A method for manufacturing a cement decorative board with Japanese paper attached, which is characterized by compression molding and curing by applying a pressure of Kg/cm ² . 2. The method for producing a Japanese paper-attached cement decorative board according to claim 1, wherein the printing plate is a photosensitive resin letterpress printing plate. 3. A cement decorative board composed of Portland cement, an inorganic filler, and reinforcing fibers, with Japanese paper attached to the upper surface and unevenness formed on the Japanese paper, wherein the unevenness on the upper surface is composed of the Portland cement and the inorganic filler. 600~4000 with reinforcing fiber
A Japanese paper-adhered cement decorative board, characterized in that it is formed by compression molding and curing under a pressure of Kg/cm ² by transferring an uneven plate material onto the Japanese paper.