KR101438650B1 - Imitation lime stone and method for fabricating the same - Google Patents

Abstract

The present invention relates to an artificial limestone and a method for manufacturing the same, more particularly, to an artificial limestone and a method of manufacturing the same, capable of enabling mass production of a high quality artificial lime stone by adding a silica having a particle shape, which can be seen by the naked eye, and a silica stone powder, in which SiO2 constitutes 90% of the total amount, to a cement and vacuum extrusion molding the cement; and making a surface texture like that of a limestone while obtaining a dense inner structure by using the particle-type slilica and the power-type silica stone. According to the present invention, because the vacuum extrusion molding by an extruder is used to overcome a conventional scheme of manufacturing the artificial lime stone by hand or using a mold, the high quality artificial limestone can be mass produced, which contributes to quality improvement of a construction material. In addition, a texture, quality and application of the artificial lime stone and the extruded cement are strictly distinguished in a construction site, so the production method of the artificial limestone using the extruder significantly contributes to a specialized high quality construction site.

Description

TECHNICAL FIELD The present invention relates to an artificial lime stone and a manufacturing method thereof.

More particularly, the present invention relates to a synthetic lime stone and a method for producing the same. More particularly, the present invention relates to a synthetic lime stone and a method for producing the same. More particularly, Artificial limestone which enables the production to be performed and the durability of the internal structure can be realized while making the texture of the surface look like Limestone by including silica sand in the form of particles and silica in the form of powder, .

Generally, most inorganic building materials produced by vacuum extrusion molding method are produced by adding more than 10% of asbestos. However, since these asbestos are harmful to the human body, there is a problem in terms of safety for both the operator and the user. Accordingly, Korean Patent No. 389660 discloses a vacuum extrusion-molded cement building material produced by mixing cellulosic fibers, sepiolite, and polypropylene fibers in place of asbestos.

The conventional vacuum extrusion molding cement comprises 50 to 65% by weight of cement, 30 to 40% by weight of silicate, 0.5 to 1.0% by weight of plasticizer, 1.5 to 3.0% by weight of cellulose fiber, 0 to 3.0% by weight of sepiolite, 0.1 to 0.15% %, And water in an amount of 23 to 30% by weight, followed by extrusion molding. However, because of the use of powders in the form of flours, the surface texture of extruded cement panels is no different from that of conventional cement products. Here, the powder form refers to having a particle size of 80 to 325 mesh as shown in Table 1 below, and it is of course that it has a smaller particle size.

Lake Mesh Visual classification No. 1 4 to 8 mesh


Visually shaped particles No. 2 8 to 12 mesh No. 3 12 to 16 mesh No. 4 16 ~ 20 mesh No. 5 20 to 30 mesh No. 6 30 to 60 mesh No. 7 60 to 80 mesh No. 8 80-100 mesh
Powder form SP1 100 to 150 mesh SP2 Over 150 mesh

Limestone, on the other hand, is mostly soft and bright in color and harder than marble because it is easy to be processed. It is widely used as a decorative material or finishing material for elaborate carving work. This is more so because limestone has a different surface texture than regular cement products. So many companies are trying to manufacture artificial limestone with a unique surface texture.

Artificial limestone should exhibit various surface textures and be superior in terms of quality. If powdery zeolite powder like the above-mentioned conventional vacuum extrusion molding cement is used, the surface texture is smooth and has a distinctive characteristic like ordinary cement can not do it. Conventionally, artificial limestone is injected into a manual mold and a mold. However, when such a product is manually injected into a mold, it is difficult to obtain uniform quality and mass production is difficult. Not only hamper the smooth supply of limestone but also increase the manufacturing cost.

Accordingly, the present inventors have proposed in Korean Patent Registration No. 10-1160594 that 35 to 45% by weight of cement, 55 to 65% by weight of silica-like particulate silica, 0.5 to 1.0% by weight of a plasticizer, 1.5 to 3.0% by weight of a cellulose fiber %, Sepiolite 0 to 3.0% by weight, polypropylene 0.1 to 0.15% by weight, and water 20 to 25% by weight, and extrusion molding, and a method for producing the same. , The registered patent was improved to provide the present invention in which the surface texture is the same as that of the rhyming stone and can have an improved strength over that of the autoclave.

In the case of artificial limestone, dry, semi-dry and bond construction methods using steel angles are available. However, in the case of a place where artificial limestone installed together with a wall may be a problem in terms of safety, And so on. In this dry construction method, the pin holes are inserted into the upper and lower surfaces of the artificial limestone, and the pins are inserted into the pin holes and fixed to the angles to fix them to the walls. In the artificial limestone, There is an inconvenience in forming a pinhole.

A problem to be solved by the present invention is to provide a method for mass production of artificial limestone of high quality by vacuum extrusion molding by adding a silicate powder having a particle size of at least 90% And a method of manufacturing the same. The present invention also provides an artificial lime stone and a method for manufacturing the artificial lime stone, which can realize the densification of the internal structure while making the texture of the surface look like Limestone.

In addition, it is possible to manufacture artificial lime stone which is easy to apply when artificial lime stone is applied.

The artificial limestone according to the present invention comprises 35 to 45 parts by weight of cement, 27.5 to 32.5 parts by weight of granular silica having a particle size of 10 to 80 mesh, a content of SiO2 of 90 By weight, 27.5 to 32.5 parts by weight of silica, 0.5 to 1.0 part by weight of a plasticizer, 0.1 to 3.0 parts by weight of sepiolite and 20 to 25 parts by weight of water, and extruding the mixture.

In addition, the artificial limestone according to the present invention is characterized in that 1.5 to 3.0 parts by weight of the spongy cellulose fiber and 0.1 to 0.15 part by weight of polypropylene are further mixed to improve the flexural strength of the artificial limestone extruded.

Further, the artificial limestone according to the present invention is characterized in that an inorganic pigment for expressing the hue of the product is further mixed with 0.5 to 5.0 parts by weight of cement.

Further, in the artificial limestone manufacturing method according to the present invention,

35 to 45 parts by weight of cement, 27.5 to 32.5 parts by weight of silica sand having a particle size of 10 to 80 mesh, 27.5 to 32.5 parts by weight of a silica content of 90% or more of SiO2, 0.5 to 1.0 part by weight of a plasticizer, ≪ / RTI > to 3.0 parts by weight, and then metering the raw materials into a dry mixer; A dry mixing step of performing dry mixing in a dry mixer charged with the raw material for 150 to 240 seconds to produce a mixture; A wet mixing step in which water is added to the dry mixed mixture to perform wet mixing for 120 to 180 seconds; A vacuum extrusion molding step of putting the wet mixed mixture into an extruder and performing vacuum extrusion molding; And a conveying belt moving the vacuum extruded molding material while keeping the same at a speed equal to the extrusion speed, and a steam curing step cured by steam.

Further, in the artificial limestone manufacturing method according to the present invention,

Further comprising a fiber sponge step of spunning the cellulose fibers; In the step of metering and injecting the raw material, 1.5 to 3.0 parts by weight of the spongy cellulose fiber and 0.1 to 0.15 part by weight of polypropylene are further added to a dry mixer to perform dry mixing.

Further, in the artificial limestone production method according to the present invention,

And a hollow portion is formed on one side of the side surface in vacuum extrusion molding in the vacuum extrusion molding step.

Further, in the artificial limestone production method according to the present invention,

Wherein the hollow portion is formed in contact with a mold having a protrusion corresponding to the shape of the hollow portion.

Further, in the artificial limestone production method according to the present invention,

The hollow portion is characterized by a circular or polygonal cross section.

Also, the method of manufacturing artificial limestone according to the present invention is characterized in that the steam curing step

And an autoclave curing step in which the resultant cured in the autoclave is cured again.

The synthetic lime stone manufacturing method according to the present invention is characterized in that the compression strength of the vacuum extrusion molded product is cured so as to secure a strength of 300 to 600

According to the present invention, since the artificial limestone is vacuum-extruded by using an extruder after being deviated from the conventional method of manufacturing artificial limestone by using a manual work and a mold, high-quality artificial limestone can be produced in a large quantity, There is an effect that can be done.

In addition, the present invention is characterized in that the appearance of the limestone is enhanced by the texture of the surface by adding a silicate powder having a particle shape of the naked eye and a SiO 2 content of 90% or more together with the cement and vacuum extrusion molding, The durability can be improved.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a process flow chart for explaining an artificial Lime stone according to the present invention and a method for producing the same.
2 (a) is a photograph showing the surface texture of artificial limestone according to the present invention.
FIG. 2 (b) is a photograph showing a side portion of artificial limestone according to another embodiment of the present invention.
3 is a photograph showing the surface texture of a conventional vacuum extrusion-molded cement.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. The following embodiments are merely provided to understand the contents of the present invention, and those skilled in the art will be able to make many modifications within the technical scope of the present invention. Therefore, the scope of the present invention should not be construed as being limited to these embodiments.

The artificial limestone according to the present invention is characterized in that 35 to 45 parts by weight of cement, 27.5 to 32.5 parts by weight of siliceous matter in the form of macroscopically granular particles, 27.5 to 32.5 parts by weight of silicate having a SiO2 content of 90% 1.5 to 3.0 parts by weight of cellulose fibers, 0.1 to 3.0 parts by weight of sepiolite, 0.1 to 0.15 parts by weight of polypropylene and 20 to 25 parts by weight of water are mixed and an inorganic pigment for expressing the color of the product is mixed with 0.5 To 5.0 parts by weight is further added and mixed, followed by extrusion molding.

At this time, it is preferable that the silica particles that can be visually distinguished are configured to have a particle size of 10 to 80 mesh.

In order to increase the size of the finished artificial limestone or to make the length of the finished artificial limestone large, in order to improve the bending strength of the finished artificial limestone in forming the mixture for extrusion molding of the artificial limestone, The content of the fibers and the polypropylene is applied in the above-mentioned weight parts to form a mixture, and then the mixture is extrusion-molded to produce artificial limestone.

However, when the water absorption rate is to be particularly lower than the bending strength of the finished artificial limestone, it is preferable to form a mixture without extrusion of the cellulose fibers and the polypropylene in the mixture for extrusion molding of artificial limestone, To form an artificial limestone.

Conventional vacuum extrusion-molded cement uses asbestos, which is a terrible substance that causes diseases such as asbestosis, lung cancer and mesothelioma. It is known that the quality of asbestos is difficult to diagnose because it is difficult to diagnose asbestos. Studies have shown that once exposed to asbestos, the disease continues even without exposure, and it develops into a fatal condition in about 20 years. Therefore, alternative fibers that can replace asbestos and are not harmful to the human body are needed. However, since asbestos plays a variety of roles such as extensibility, formability, and moisture retention as well as strength reinforcement, it is difficult to replace asbestos with a single fiber. Therefore, the present invention is characterized by incorporating cellulose fibers, sepiolite, and polypropylene instead of using asbestos.

At this time, the cellulose fiber is produced from wood as an organic fiber. In the present invention, a cellulose fiber obtained from a newspaper crusher is used. Cellulosic fibers have poor strength and dispersibility compared to other fibers, but cellulose fibers have been mixed because they have excellent water absorbing properties and can solve the problem of surface drying occurring in the production of the product.

In addition, the sepiolite is a natural inorganic fiber, which is excellent in heat resistance and dispersibility and can be improved in physical performance. Therefore, the polypropylene fiber has poor heat resistance, but the hollow portion of the product Because they can compensate for the deflection phenomenon.

The artificial limestone according to the present invention is characterized in that silica sand having a particle shape that can be distinguished visually and silica sand having an SiO 2 content of 90% or more are mixed together. The mixture is extrusion-molded to form artificial limestone In addition, it is possible to obtain various surface textures by the silica sand in the form of particles, and the densification of the internal structure can be realized by the silica powder, thereby improving the durability.

Also, the artificial limestone according to the present invention may be configured to form a mixture by further containing an inorganic pigment for expressing the color of the product, in an amount of 0.5-5.0 parts by weight of the cement. When the inorganic pigment for color development is further included, the color of artificial limestone can be diversified, so that various surface textures can be obtained.

Next, an artificial lime stone manufacturing method according to the present invention will be described.

Referring to FIG. 1, the synthetic lime stone manufacturing method according to the present invention includes a fiber sponge step S10, a raw material metering and feeding step S20, a dry mixing step S30, a wet mixing step S40, A vacuum extrusion molding step S50, a steam curing step S60, an autoclave curing step S70, and a shipping step S80.

At this time, if artificial limestone produced through extrusion molding should be applied at a low water absorption rate rather than supplementing the bending strength, the fiber sponge step S10 may be omitted and the raw material metering and injection step S20 may be performed immediately. However, in the following, a method of manufacturing artificial limestone including the fiber sponge step S10 will be described in detail.

First, the cellulose fibers are spun in the fiber sponge step S10. Since the dispersibility of the cellulose fiber is not better than that of the asbestos, it is subjected to the spongy process through the fiber sponge step S10. Unless sponging is carried out, the cellulose fibers are aggregated and the extrudability and the surface condition of the product become poor. Although the sea surface of the cellulose fiber may be made to pass through a separate sea surface, the cellulose fiber may be first run for 60 seconds in a dry mixer used for dry mixing, and then other materials may be added to perform dry mixing. have.

The raw material metering and dosing step (S20) is configured to weigh the cellulose fibers and the cement, silica, silica powder, plasticizer, sepiolite, and polypropylene, which are sponged, into a dry mixer.

As described above, the raw materials to be metered in the raw material metering and inputting step (S20) are 35 to 45 parts by weight of cement, 27.5 to 32.5 parts by weight of silty silica capable of being visually distinguishable, 0.5 to 1.0 part by weight of a plasticizer, 1.5 to 3.0 parts by weight of spongy cellulose fiber, 0.1 to 3.0 parts by weight of sepiolite and 0.1 to 0.15 part by weight of polypropylene are weighed and put into a dry mixer. At this time, the inorganic pigment for expressing the hue of the product may be added in an amount of 0.5 to 5.0 parts by weight of the cement.

Also, as described above, the sea surface of the cellulose fibers may be formed in the dry mixer. In this case, since the sea-laid cellulose fibers are already present in the dry mixer, the remaining ingredients may be directly introduced into the dry mixer.

At this time, the present invention is characterized in that silica-type silica-like particles which can be visually distinguished and powder-type silica-silica powder are used together. In the production of conventional vacuum extrusion-molded cement, powdery quartz powder was used. In the present invention, only artificial silica lime stone was used in the production of artificial lime stone. However, in the present invention, Use the silica powder together.

Here, the powder form refers to having a particle size smaller than 80 mesh, and the visual formable particle form means to have a particle size larger than 80 mesh. In the present invention, it is preferable to use silica sand having a size of 10 to 80 mesh.

In the present invention, cement contains 35 to 45 parts by weight, silica-based silica is 27.5 to 32.5 parts by weight, powdery silica-based silica is 27.5 to 32.5 parts by weight Quot; part ".

In the conventional vacuum extrusion molding cement production, 50 to 65 parts by weight of cement and 30 to 40 parts by weight of zirconium silicate were added to make the amount of zirconium silicate smaller than that of cement. However, in the present invention, By making the amount of silica sand and silicate powder almost the same, the slightly rough and natural surface texture of the limestone can be expressed by the granular silica sand, Structure is implemented.

In addition, the plasticizer is used to impart lubricity and viscosity of the cement raw material, and is mainly used in the presence of iodoxyl methylcellulose. The viscosity required in the vacuum extrusion molding process is 15000 cps or more.

The dry mixing step (S30) is configured to perform dry mixing in the dry mixer in which the raw material is introduced for 150 to 240 seconds to produce a dry mixed mixture.

When dry mixing is completed for the predetermined time, water is introduced in the wet mixing step (S40) and wet mixing is performed for 120 to 180 seconds.

When the wet mixing is completed, the mixture is injected into the extruder in the vacuum extrusion molding step (S50) and vacuum extruded into a shape of a building material such as an exterior material, an interior material, a soundproof wall, and a window support.

In the vacuum extrusion molding step (S50), the wet mixed material is mixed again in a small kneader, and the resulting mixture is introduced into an extruder and then passed through a perc screw, a vacuum chamber, an auger, a gate, and a final die. At this time, in the vacuum chamber, degassing is performed at a vacuum pressure of about 75 mmHg.

The steam curing step (S60) is configured to be first cut and cured by steam while being moved to a subsequent process by a conveyor belt that moves while maintaining the vacuum extruded molding at the same speed as the extrusion speed.

In the autoclave curing step S70, after the steam curing is completed, the product is inspected for warpage and surface condition, and the autoclave curing is performed after the second cutting by finishing. When the autoclave curing is completed, the physical property inspection and final processing are performed, and the product is shipped (S80).

Further, when the strength of the compressive strength of 300 to 600 is secured through the curing step (S60) and the subsequent curing step, the autoclave curing step (S70) is determined to be sufficiently cured as artificial limestone, (S80).

According to the embodiment, a hollow portion may be formed on one side of the wet mixed mixture to be formed in vacuum extrusion molding in the vacuum extrusion molding step (S50). At this time, the hollow portion to be formed is inserted into a pin or the like to be engaged with a fixture such as an angle at the time of construction, and is preferably formed in a shape corresponding to the shape of the object to be inserted, such as a cylindrical shape or a square pillar shape.

Such a hollow portion can be formed by various methods, but it is possible to form the hollow portion by abutting against a mold having a protrusion formed in a shape corresponding to the hollow portion (for example, when the hollow portion is formed into a cylindrical shape, As shown in FIG.

FIG. 2 (a) is a photograph showing the surface texture of artificial limestone according to the present invention, and FIG. 3 is a photograph showing a surface texture of a conventional vacuum extrusion molding cement. 2 (a) and FIG. 3, in the present invention, the surface texture of the limestone is shown because it uses the granular silica which can be distinguished by the naked eye, but the conventional vacuum extrusion molding cement has the powdery zeolite , It can be seen that it is not different from general cement products whose surface texture is very smooth.

2 (b), which is a side view of the artificial limestone according to another embodiment of the present invention, a hollow section having a rectangular cross-section can be formed on the side of the artificial limestone according to the present invention. As described above, the hollow portion is for inserting a rectangular columnar object. One side of the object is fixed to an angle or the like, and the other side is inserted into the hollow portion of the artificial limestone to firmly support the artificial limestone. There is an effect that the time required for the construction is shortened. The hollow portion of the rectangular cross-sectional shape shown in FIG. 2 (b) is merely an example, and the cross-section may be formed in various shapes such as a circle, a triangle, and the like.

As described above, the artificial limestone according to the present invention has a surface texture of natural limestone. Since artificial limestone is produced by a vacuum extrusion molding method out of the conventional manual work and frame work, it is possible to obtain a high- do. Therefore, it is possible to supply virtually indefinite artificial limestone, which is needed in the field of construction and remodeling, and to add diversity of choice of building materials and beauty of building exterior. And because it does not use asbestos, it is not harmful to human body.

Claims (10)

35 to 45 parts by weight of cement, 27.5 to 32.5 parts by weight of granular silica having a particle size of 10 to 80 mesh, 27.5 to 32.5 parts by weight of a silica containing 90% or more SiO2, 0.5 to 1.0 part by weight of a plasticizer 0.1 to 3.0 parts by weight of sepiolite, 1.5 to 3.0 parts by weight of spongy cellulose fiber, 0.1 to 0.15 part by weight of polypropylene, and 20 to 25 parts by weight of water, and extrusion molding the resultant mixture. delete The method according to claim 1,
Wherein 0.5 to 5.0 parts by weight of the cement is further mixed with an inorganic pigment for expressing the color of the product. In the artificial lime stone manufacturing method,
35 to 45 parts by weight of cement, 27.5 to 32.5 parts by weight of silica sand having a particle size of 10 to 80 mesh, 27.5 to 32.5 parts by weight of a silica content of 90% or more of SiO2, 0.5 to 1.0 part by weight of a plasticizer, ~ 3.0 parts by weight, 1.5-3.0 parts by weight of spongy cellulose fibers, and 0.1-0.15 parts by weight of polypropylene, and then inputting the metered raw materials into a dry mixer;
A dry mixing step of performing dry mixing in a dry mixer charged with the raw material for 150 to 240 seconds to produce a mixture;
A wet mixing step in which water is added to the dry mixed mixture to perform wet mixing for 120 to 180 seconds;
A vacuum extrusion molding step of putting the wet mixed mixture into an extruder and performing vacuum extrusion molding; And
Moving the vacuum extruded molding by a conveyor belt moving while maintaining the same speed as the extrusion speed;
Characterized in that it comprises a steam curing step cured by steam. delete 5. The method of claim 4,
Wherein a hollow portion is formed on one side of the side of the wet mixed mixture to be formed in the vacuum extrusion molding step in the vacuum extrusion molding. The method according to claim 6,
Wherein the hollow portion is formed in contact with a mold having a protrusion corresponding to the shape of the hollow portion. The method according to claim 6,
Wherein the hollow portion has a circular or polygonal cross-section. 5. The method of claim 4,
And an autoclave curing step of curing the resultant cured in the steam curing step again in an autoclave. delete

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