KR20160105028A - Method for variation of stone color and Color stone manufactured using the method - Google Patents

Abstract

The present invention provides a method for changing a stone color effectively enabling the penetration of metal particles by coating a catalyst for changing a color comprising the metal particles and applying an electric field or vacuum. According to the present invention, provided is a color stone having high added value due to uniform color change with respect to total stones by effectively penetrating metal particles which constitute the catalyst for changing a color in an inner portion of the stones.

Description

TECHNICAL FIELD The present invention relates to a stone color conversion method and a color stone produced using the same,

The present invention relates to a method for changing the color of a stone such as granite stone by penetrating metal particles using an electric field, and a color stone produced by using such a method.

Technological attempts have been made to convert colorless stone such as granite, which has abundant reserves and production capacity, into high value-added colored stone all over the world.

Conventionally, there has been a technique (dyeing technology) for converting color by applying dyes or pigments to a stone, but in this technique, even if the whole stone is difficult to penetrate and even if it is dyed, it is discolored or discolored over time, There is a great limitation in using it as interior and exterior materials for construction due to the problems such as the occurrence of the southern phenomenon.

In addition, inorganic pigments used in glaze and the like have been tried many times, but commercialization has not been achieved due to the damage of the stone due to the high-temperature firing above 800 degrees and the disadvantage of being treated only on the outer surface.

In recent years, attempts have been made to convert an inorganic catalyst to a colored stone having the same physico-chemical properties as natural stone by permeating the interior of the stone and permanently converting the constituent material through a catalytic reaction.

Each metal has its own color, and when it forms an oxide with oxygen, it has various colors. The color of the oxide may be different depending on the reaction conditions such as the kind of the reactant and the temperature, and may be a new color when some metals form a compound.

Accordingly, in the present invention, a technique of permanently changing the color of a stone by making a metal component into an ionic form or a nano form to form a metal oxide after penetrating into a stone is applied.

However, in the case of stone such as granite, since the structure is dense and the pore size is nano-sized, it is difficult for the catalyst to penetrate into the interior of the stone, and there is a problem that a part where color conversion is not performed appears at the center of the stone .

In order to solve the above-described problems, it is an object of the present invention to provide an efficient method of allowing metal particles constituting a discoloration catalyst to penetrate into the inside of a stone so that uniform color conversion can be performed on the entire surface of the stone.

As a means for solving the above-mentioned problems, the present invention provides a method for producing an optical fiber, comprising the steps of: applying a discoloration catalyst containing metal particles to a stone; And applying an electric field in a direction in which the metal particles penetrate the stone.

At this time, it is preferable that the electric field is applied with a DC voltage, more preferably, a pulse DC voltage is applied. Further, it is preferable that the electric field is applied periodically.

As another means for solving the above-mentioned problems, the present invention provides a method for manufacturing a metal mold, comprising the steps of: applying a discoloration catalyst containing metal particles to a stone; And applying a vacuum to the stone material.

The metal particles contained in the discoloration catalyst are at least one selected from the group consisting of manganese (Mn), iron (Fe), cobalt (Co), nickel (Ni), copper (Cu) .

The discoloration catalyst may be at least one metal selected from the group consisting of Mn, Fe, Co, Ni, Cu, Ca, An aqueous solution of at least one of sulfate, hydrochloride or nitrate.

In the stone conversion method, it is preferable to perform a step of heating and drying the stone before the step of applying the electric field to the stone, and after the step of applying the electric field, the step of air cooling the stone is preferably performed.

Meanwhile, the present invention can provide a stone produced by any one of the above-described stone color conversion methods and color-changed to a depth of 5 mm to 40 mm.

    According to the present invention, the metal particles constituting the discoloration catalyst are effectively penetrated into the interior of the stone so that uniform color conversion can be performed with respect to the whole stone, thereby providing a color stone having a higher added value.

As a result, it is possible to create high added value up to 10 times by changing the color and pattern of the stone which is traded at a low price due to the relatively large amount of reserves and production.

In addition, due to the nature of the building stone, the merchantability after drilling for a certain period is considerably lowered.

In particular, in the case of domestic stones, low cost granite is one of the main types of grayish white one. By using the present invention, it is possible to manufacture products which are equal to or superior in terms of price and quality.

It is possible to substitute gray (gonghwa stone) and black (maroon) stone which is produced in a small part of the country in Korea and secure price competitiveness of imported stone stones. As a result of recent rapid growth of Chinese high quality stone market, As imports are soaring, color stones are expected to be exported to China.

It is expected that it will be able to dramatically develop the gray-white stone industry with low added value by making use of low-cost stone to produce the high-value-added products by developing color and sophistication possessed by high-grade stone.

1 is a diagram showing a problem of the prior art.
FIG. 2 and FIG. 3 are diagrams schematically showing the basic concept of the present invention.
4 is a diagram illustrating a method of applying an electric field according to an embodiment of the present invention.
5 is a view showing a method of applying a vacuum according to an embodiment of the present invention.
FIGS. 6 and 7 are cross-sectional photographs of a granite showing a comparison of results obtained by applying the stone color conversion method according to each embodiment of the present invention.
8 is a graph showing a result of comparing the results of applying the stone color conversion method according to each embodiment of the present invention.
FIGS. 9 and 10 are cross-sectional photographs of a granite showing a comparison of results obtained by applying the stone color conversion method according to still another embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, the present invention is not limited to the embodiments described herein but may be embodied in other forms. Rather, the embodiments disclosed herein are provided so that the disclosure can be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.

Each metal has its own color, and when it forms an oxide with oxygen, it becomes a different color. The color of the oxide may be different depending on the reaction conditions such as the kind of the reactant and the temperature, and may be a new color when some metals form a compound.

The present invention is a catalyst technology for forming a metal oxide into an ionic form or a nano form by forming a metal oxide after impregnating a stone with attention to the fact that a stone has a color such a metal oxide.

Normally, metal forms a metal oxide at a high temperature of 800 degrees or more. However, at such a high temperature, there is a problem that the stone can not stand. In order to overcome this problem, the present invention proposes a method of forming a metal oxide by impregnating a stone with a discoloration catalyst composed of a solution of metal salts (sulfate, nitrate, hydrochloride, etc.) in distilled water and applying heat at a low temperature.

The metal catalyst used in the present invention is at least one selected from the group consisting of Mn, Fe, Co, Ni, Cu, Ca and Mg, Hydrochloric acid, and nitrate are dissolved in distilled water at a predetermined ratio. Ex) Nickel sulfate, copper sulfate, iron nitrate, manganese nitrate

The proportion of each metal is varied according to the desired color and the ratio is adjusted according to the characteristics of the target stone.

The general stone color conversion process according to the present invention is as follows.

One) Dry the stone plate of 20mm ~ 30mm thickness at 150 ℃ for more than 2 hours and cool to room temperature.

2) 1), the metal catalyst aqueous solution is evenly applied using a brush or roller.

3) When the catalyst has sufficiently penetrated into the stone, the stone is placed in an electric furnace and heated.

4) The temperature is maintained between 120 ° C and 500 ° C for 2 hours - 3 hours. For each color and catalyst, the temperature conditions are derived from the study.

5) After the reaction, the stone is cooled to room temperature and then it is produced as a finished stone product through polishing and cutting process.

However, when the above process is applied to the stone, granite has a dense structure and the pore size is nano-sized, so that it is difficult for the catalyst to penetrate into the interior of the stone. That is, as shown in FIG. 1, there is a problem that a part where the color conversion is not performed appears in the central part of the stone. In the above-mentioned method, it was possible to penetrate up to 10 mm inside the granite, but there was a problem that it was difficult to permeate and discolor the granite. Therefore, it is necessary to adjust the size and penetration characteristics of the catalyst and to introduce new catalyst penetration techniques.

In the present invention, two methods of applying an electric field and applying a vacuum for effective penetration of metal catalyst particles will be used. 2 and 3 are conceptual diagrams of the two methods.

As an embodiment of the present invention, a method of infiltrating a discoloration catalyst using an electric field will be described.

After the stone is heated and dried, the discoloration catalyst is spread evenly on the stone surface. Thereafter, an electric field is applied to the stone, and the direction of the electric field is the same as the direction in which the metal ions of the discoloration catalyst penetrate. It is the principle that the metal particles, which are positive, penetrate into the interior of the stone by the electric field.

4 is a view showing a method of applying an electric field according to an embodiment of the present invention. The electric field generator used is a DC type power supply, and the types of generated pulses are DC and pulse DC modes. In addition, since the maximum output of the device is 1 kV, the embodiment is performed within 900 V for safety.

The discoloration catalysts used in the examples were red and black catalysts. Color conversion The surface of the stone did not show a large difference depending on the applied electric field conditions.

Figs. 6 and 7 show the results of stone conversion according to the conditions of the applied electric field.

6 is a cross-sectional photograph of a granite stone which was reacted for 30 minutes with different bias types applied. Compared to the case where the bias is not applied, the penetration depth is increased in all the cases where the bias is applied. Especially, when the pulse type bias is applied, the effect is large.

FIG. 7 is a cross-sectional photograph of a granite stone which was reacted for 60 minutes with different bias types applied. In this case, penetration depth was increased in all of the cases where the bias was applied as compared with the case where there was no bias. Especially, when pulse type bias is applied, the effect is large.

8 is a graph summarizing the results according to electric field conditions. As shown in the graph, the penetration depth was increased when the bias was used, and it was possible to penetrate to a deeper depth than when the pulse type bias was applied . In this graph, penetration of 30 mm or more (about 40 mm depth discoloration) is possible if the process is performed for 1 hour or more, but another embodiment is conducted in order to proceed the thickness of 30 mm within 1 hour for mass production efficiency without defects .

In another embodiment, the experiment was conducted using a power supply having a maximum output of 100 kV that can only be DC bias. Experiments were conducted using a power supply with a higher voltage output, but the results were not improved compared to the conventional method.

The results show that the application of DC bias is effective in improving the charging rate, but the magnitude of the applied voltage is not important when applied with a general DC bias.

In another embodiment of the present invention, a double-sided injection method was used to fabricate a specimen having no intermediate connection at a thickness of 30 mm or more by using the electric field application method described above. 9 is a cross-sectional photograph of a granite showing the result of using the two-sided loading method. As can be seen from FIG. 9, in all the cases using the bias, it is confirmed that the color conversion is performed without bonding at the thickness of 30 mm in the double-side input method.

In another embodiment of the present invention, a change with the magnitude of the applied frequency is measured using a function generator. The output voltage of the function generator was 10 V at maximum and the frequencies were 1 kHz and 1 MHz, and the results are shown in FIG. It can be seen that the input ratio is significantly improved when the frequency is high despite the low voltage.

As another method of the present invention, a method of applying a vacuum can be used. 5 is a view showing a method of applying a vacuum to a stone according to an embodiment of the present invention.

When vacuum was not applied, it was possible to discolor up to 10 mm, but when vacuum was applied, discoloration was confirmed to be over 30 mm.

As described above, an optimal embodiment has been disclosed in the drawings and specification. Although specific terms have been employed herein, they are used for purposes of illustration only and are not intended to limit the scope of the invention as defined in the claims or the claims. Therefore, those skilled in the art will appreciate that various modifications and equivalent embodiments are possible without departing from the scope of the present invention. Accordingly, the true scope of the present invention should be determined by the technical idea of the appended claims.

Claims (8)

Applying a discoloration catalyst comprising metal particles to the stone; And
Applying an electric field in a direction in which the metal particles penetrate the stone;
And converting the color of the stone into color.
The method according to claim 1,
Wherein the electric field is applied by applying a DC voltage.
The method according to claim 1,
Wherein the electric field is applied by applying a pulse DC voltage.
The method according to claim 1,
Wherein the electric field is periodically applied.
Applying a discoloration catalyst comprising metal particles to the stone; And
Applying a vacuum to the stone;
And converting the color of the stone into color.
6. The method according to claim 1 or 5,
The metal particles may be,
A stone color conversion method comprising at least one selected from the group consisting of Mn, Fe, Co, Ni, Cu, Ca, and Mg.
6. The method according to claim 1 or 5,
The above-
Hydrochloride or nitrate of at least one metal selected from the group consisting of Mn, Fe, Co, Ni, Cu, and Mg. A stone color conversion method comprising at least one selected aqueous solution
A colored stone produced by the stone color conversion method of any one of claims 1 to 5 and discolored to a depth of 5 mm to 40 mm.

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