KR100466724B1 - Method and composition for coloring stone - Google Patents

Abstract

A colorant mixture for stone coloring and a color conversion method of stone are disclosed.

In the method of the present invention, selecting and cutting stones to a predetermined size, trimming the surface of the cut stone, washing and drying the polished stone surface, and organic solvent 50 to 70 wt%, the organic Preparing a colorant mixture comprising 1 to 5% by weight of a dye soluble in a solvent, 2 to 10% by weight of a pigment, and 5 to 30% by weight of a thermosetting resin for attaching the dye and the pigment to a stone surface; and the colorant mixture prepared in the step. And applying a current to the electrolytic colorant mixture, immersing the processed stone for a predetermined time and coloring the same, and washing and drying the colored stone.

According to the method of the present invention, by providing a method that can have a variety of colors and textures on the surface of the stone to overcome the monotony that the existing stone has the effect of expanding the application to the interior, exterior materials as well as decorative use for building There is.

Description

Color conversion method of stone {Method and composition for coloring stone}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a color conversion method of a stone. More particularly, the present invention relates to a color conversion method of a stone capable of improving physical properties and color and texture of a stone used in various interior and exterior building materials.

In general, a variety of materials are used in the building and exterior materials so as to meet the function and aesthetics of the interior and exterior space of the building. The inner and exterior materials serve to block rain, wind, Hansa, solar radiation, fire, heat and noise, and the materials are classified into wood, synthetic resin, and stone.

Among the materials of interior and exterior building materials used in the prior art, stone was frequently used as a durable and environmentally friendly material. However, the existing stone was not able to meet the needs of consumers who require a variety of colors using the texture or color obtained from nature. In this case, the interior and exterior materials of the building have a stone texture by using pigments and adhesives mixed with artificial stone powder in a certain ratio, but they are used as stone surfaces.However, due to the effect of ultraviolet rays, the color of the surface is increased. There is a problem that deformed or discolored, there was a problem that dust and pigments scattered in the working process.

In addition, in the case of marble, the surface of the collected natural stone must be mechanically processed several times, and the grinding process is very expensive, and the processing cost is very expensive. There was a disadvantage that occurs when the powder occurs.

On the other hand, recently, due to the development of nanotechnology, excellent antimicrobial properties of silver nanoparticles are known, but there is no application example in the surface treatment of stone.

The present invention has been made in view of the above point, the object of the present invention by coloring to have a variety of colors and textures on the surface of the stone, overcoming the monotony of the existing stone for building, exterior materials as well as decorative It is to provide a color conversion method of stone that has expanded its application to use.

Another object of the present invention is to provide a color conversion method of the stone that can implement a variety of surface textures and colors in the collected stone, and can realize a smooth gloss without fear of being oxidized in the air and without the need for several times of polishing processing It is in doing it.

Another object of the present invention is to provide a color conversion method of environmentally friendly stone by preventing dust from being scattered during the coloring process by not using stone powder or powdered pigment as before.

Still another object of the present invention is to provide a method for converting a color of a stone to which nano-size silver powder is coated on a surface of a stone to give antimicrobial properties.

In order to achieve the above object, the present invention selects and cuts a stone to a predetermined size, trimming the surface of the cut stone and washing and drying the stone, the surface being trimmed and methyl ethyl ketone as an organic solvent, Mixture of at least one aliphatic hydrocarbon solvent selected from the group consisting of acetone, diethylene glycol monobutyl monoether and diethylene glycol monoethyl monoether and at least one aromatic hydrocarbon solvent selected from the group consisting of toluene, xylene and benzene 50-70 % By weight, 1 to 5% by weight of the dye soluble in the organic solvent, 2 to 10% by weight of the pigment, and 5 to 30% by weight of the silicone resin and 0.1 to 0.1% of the silane coupling agent as a thermosetting resin for attaching the dye and the pigment to the stone surface. Preparing a colorant mixture consisting of 5% by weight and a current in the colorant mixture prepared in step S3 It provides a color conversion method of the stone comprising the steps of depositing and coloring the stone processed in the electrolyzed colorant mixture for a predetermined time and washing and drying the colored stone. According to the present invention, a stone having various colors and textures is provided according to the dyes and pigments used by attaching the dyes and pigments dissolved or dispersed in the organic solvent to the stone surface by the thermosetting resin.

In addition, the surface of the colored dried stone in the method of the present invention may be coated with a sunscreen to reduce the discoloration of the surface by ultraviolet light. Here, the sunscreen may be 5 to 20% by weight of silver powder of 20nm or less, 5 to 20% by weight of titanium oxide, 30 to 50% by weight of polyvinylidene fluoride (PVDF) and 10 to 50% by weight of a diluent. In addition, the diluent may be toluene.

Furthermore, the organic solvent may be a mixture of methyl ethyl ketone and toluene, the thermosetting resin may be a silicone resin, and the pigment may be an inorganic pigment.

Hereinafter, the present invention will be described in detail.

The first step of the present invention is the step of selecting the stone taken from nature and cutting to a desired size, and trimming the surface of the cut stone using a polishing machine (step S1). Stones that can be used are all rocks that can be obtained in nature, especially granite, which is advantageous for the application of the present invention. Granite is made of crystals of quartz, mica, feldspar, and the like, and fine pores are formed between the grains. Especially, granite in Korea is high in strength, high in grain, and widely used as decorative and decorative interior and exterior stone.

Then, after washing with water or the like to remove impurities from the surface of the polished stone and dried, it is ready to attach the colorant (step S2).

The present invention is 50 ~ 70% by weight of the organic solvent, 1 to 5% by weight of the dye soluble in the organic solvent, 2 to 10% by weight of the pigment, 5 to 30% by weight of the thermosetting resin for attaching the dye and the pigment on the stone surface The colorant mixture which consists of these is used. The dyes here are readily available on the market as so-called solvent organic dyes, soluble in organic solvents. Commercially available organic dyes include ORICO, produced by Orico, Korea, and NEOJAPON, BASF, Germany. Pigments may be used either alone or in combination with organic pigments and / or inorganic pigments in accordance with the desired functions such as hiding properties. Inorganic pigments are preferred for applications where light resistance is preferred. The color and hiding power of the stone surface are controlled by the amount of dye and pigment used. In addition, usable organic solvents are those which can dissolve the organic dyes, for example, aliphatic hydrocarbons such as methyl ethyl ketone (MEK, Methyl Ethyl Kethne), acetone, diethylene glycol monobutyl monoether and diethylene glycol monoethyl monoether. Solvents, aromatic hydrocarbon solvents such as toluene, xylene, benzene, and the like, and preferably methyl ethyl ketone and toluene are mixed and used. At this time, a preferred mixing ratio of the organic solvent is 20 to 70% by weight of methyl ethyl ketone and 15 to 40% by weight of toluene based on the total weight of the colorant mixture. In addition, the thermosetting resin serves as a binder (binder) for attaching the dyes and pigments to the stone surface, melamine resins, phenol resins, alkyd resins, silicone resins, etc. are used alone or in combination. Preferably, as a silicone resin, commercially available silicone resins include Dow Corning's DC-806, and the like. In addition, a silane coupling agent may be mixed and used to further increase the adhesive strength of the silicone resin. Commercially available silane coupling agents include DC Z-6032 from Dow Corning, USA. The silicone resin and silane coupling agent contained in the oily colorant mixture are 5 to 30% by weight and 0.1 to 5% by weight of the silane coupling agent, respectively (step S3).

On the other hand, in order to make the color of the stone surface clear, the colorant mixture contains 1 to 10% by weight of glacial acetic acid (acetic acid) and 1 to 5% by weight of alum (M ¹ A ¹ (So ₄ ) 12H _{2 based} on the total weight of the colorant. O) may further include.

Next, the present invention includes a process of flowing a current through the colorant mixture before applying the prepared colorant mixture to the stone. (Step S4) The electrolysis of the colorant solution comprises dyes and pigments distributed unevenly in the solution. Uniformity facilitates adhesion to the stone surface and helps to achieve uniform coloring. In other words, when the above-described colorant solution is supplied to the electrolytic cell and the current is supplied, the cations in the colorant mixture move to the negative electrode, the anion moves to the positive electrode, and a partial chemical change occurs on the surface of the electrode. At this time, the colorant mixture inside the electrolytic cell is finely ionized. This significantly improves the penetration into the stone. By increasing or decreasing the amount of current according to the type of stone to be colored, the penetration conditions into the stone can be changed.

The washed stone is then immersed in the prepared colorant mixture for a predetermined time (step S5). That is, the stone is deposited with a predetermined gap in the settling tank, and then the colorant is fed into the settling tank and immersed for about 30 minutes. The time to deposit is appropriately adjusted according to the type of stone and the degree of roughness of the stone surface.

The colored stone is cleaned with a suitable cleaning agent. The cleaning agent may be composed of 50 to 90% by weight of toluene, 5 to 20% by weight of acetic acid and 5 to 10% by weight of alcohol. The stone which has been washed and colored is subjected to a drying process to complete the method of the present invention. (Step S6) Here, the drying process is instantaneous short-circuit by energizing electricity, and dried up to moisture in the stone by strong heat generated when a short occurs. Can be used.

On the other hand, the method of the present invention can be selectively coated with a sunscreen on the stone surface is completed coloring (step S7) The sunscreen is mainly coated on the stone of the exterior material, the fluorine resin as a main component, 20nm or less 5-20 wt% of silver powder, 5-20 wt% of titanium oxide powder, 30-50 wt% of polyvinylidene fluoride (PVDF), and 10-50 wt% of toluene may be used as a diluent. Silver powder is excellent in antibacterial and durable, and commercially available is nano silver (trade name of Korea Biotechnology Co., Ltd.). Titanium oxide fine particles are metallic inorganic materials that block ultraviolet rays to protect the color of the colored stone from ultraviolet rays. Polyvinylidene fluoride (PVDF) resin attaches silver powder and titanium oxide to the stone surface and protects the stone with strong durability. The coating method is coated with a spray or a brush according to the amount of stone, and the coating liquid is left to cure for about 8 hours after coating in case of natural curing of the coating solution, and takes about 10 minutes at 250 ° C for thermal curing.

Hereinafter, embodiments of the present invention will be described.

Granite was cut to 30mm x 500mm x 1,000mm and washed and dried. A sedimentation tank equipped with an electrolysis facility was charged with the following colorant mixture and electrolyzed for 20 minutes under conditions of 25 amps of 380 volts.

Colorant mixture

Methyl ethyl ketone 50 wt%

Toluene 15% by weight

Dye (ORICO YELLOW 210) 3% by weight

Pigment (PANAX PY-1000R) 4 wt%

15% by weight of silicone resin (DC 806)

Silane coupling agent (DC Z-6032) 3 wt%

Acetic acid 6% by weight

Alum 4 wt%

The prepared granite was precipitated in the settling tank for 30 minutes to be colored, washed and dried. The colored stone was coated with the following sunscreen mixture and cured at high temperature.

* Sunscreen mixture

Silver powder (NANOSILVER) 15% by weight,

Titanium oxide 12% by weight

Polyvinylidene fluoride (PVDF) 38% by weight

Toluene 35 wt%

Weathering, daylight fastness, water resistance and chemical resistance of the colored stone through the above process was tested as follows.

(1) weather resistance test

The test was carried out five times of a test for leaving the colored stone a) at 20 ± 2 ° C. for 1 hour, b) 60 ± 2 ° C., at 90 ± 5% RH for 6 hours, and c) at −30 ± 2 for 6 hours. Color change was observed but there was no abnormality.

(2) water resistance test

The colored stone was tested by the KS F 4061: 2001 test method and the result was 0.1% water absorption (= dry stone weight / (absorbent stone weight-dry stone weight) * 100).

(3) chemical resistance test

-After spot test (SPOT TEST) for 1 hour using liquid detergent (Yuhan Lax, Co., Ltd.), no change was observed.

-Concentrated powder detergent (SuperTie, LG Household & Health Care Brand Name) at 50% concentration was tested in the same way as above liquid detergent, and the change of gloss and color was observed, but there was no problem.

-The hydrochloric acid solution (pH2) was tested in the same manner as the above liquid detergent to observe the change of gloss and color.

(4) UV resistance test

The colored stone was tested by the KS F 2274: 2002 test method (WS-A, 200 hours), and the color change was observed but there was no abnormality.

As a result of the test as described above, the stone colored by the present invention is not changed in the gloss or color even with various chemicals and ultraviolet rays, it is expected that the use of the interior materials as well as building exterior materials.

According to the method of the present invention described above, by providing a method that can have a variety of colors and textures on the surface of the stone to overcome the monotony that the existing stone has to expand its application to the interior, exterior materials as well as decorative use for building It is effective.

In addition, by applying a sunscreen coating on the stone surface provides a color conversion method of the stone with a low risk of discoloration even during long-term use.

In addition, the present invention provides a method of coating a nano-sized silver powder on the surface of the stone to provide a color conversion method of the stone is given antimicrobial properties.

Claims (12)

Selecting and cutting the stone to a predetermined size, and trimming the surface of the cut stone (S1); Washing and drying the stone having a polished surface (S2); At least one aliphatic hydrocarbon solvent selected from the group consisting of methyl ethyl ketone, acetone, diethylene glycol monobutyl monoether and diethylene glycol monoethyl monoether as an organic solvent and at least one aromatic selected from the group consisting of toluene, xylene and benzene 50 to 70% by weight of a mixture of a hydrocarbon solvent, 1 to 5% by weight of a dye soluble in the organic solvent, 2 to 10% by weight of a pigment, and 5 to 30% by weight of a silicone resin as a thermosetting resin for attaching the dye and the pigment to a stone surface. Preparing a colorant mixture consisting of% and 0.1 to 5% by weight of a silane coupling agent (S3); Applying a current to the colorant mixture prepared in step S3 (S4); Depositing the processed stone in the electrolyzed colorant mixture for a predetermined time and coloring the same (S5); And Washing and drying the colored stone (S6); Color conversion method of the stone comprising a. The method of claim 1, wherein after the step S6, 5-20% by weight of silver powder of 20 nm or less, 5-20% by weight of titanium oxide, 30-50% by weight of polyvinylidene fluoride (PVDF) and diluent (toluene) Color conversion method of the stone, characterized in that it further comprises the step (S7) of coating a sunscreen consisting of 10 to 50% by weight. delete delete The method of claim 1, wherein the organic solvent is a mixture of 20% to 70% by weight of methyl ethyl ketone and 15% to 40% by weight of toluene. delete The method of claim 1, wherein the step S6 is a color conversion method of stone, characterized in that the washing with a cleaning agent composed of 50 to 90% by weight of toluene, 5 to 20% by weight of acetic acid, 5 to 10% by weight of alcohol. The method of claim 1, wherein in step S6, the stone is connected to an electrical cathode and an anode, and a short shot is applied to the stone. 9. The colorant mixture according to claim 1, 2, 5, 7, or 8, wherein the colorant mixture contains 1 to 10% by weight of acetic acid and 1 to 5% by weight of alum (M ¹ A) based on the total weight of the colorant. ¹ (So ₄ ) 12H ₂ O) The method of color conversion of the stone characterized in that it further comprises. 9. The color conversion method of stone according to claim 1, 2, 5, 7, or 8, wherein the stone is granite. 20 to 70% by weight of methyl ethyl ketone and 15 to 40% by weight of toluene as organic solvents, 1 to 5% by weight of dyes soluble in the organic solvent, 2 to 10% by weight of pigments, and thermosetting for attaching the dyes and pigments to stone surfaces 5 to 30% by weight of the silicone resin as the resin, 0.1 to 5% by weight of the silane coupling agent for assisting the adhesive strength of the silicone resin colorant mixture for stone surface coloring. 12. The stone surface according to claim 11, further comprising 1 to 10% by weight of acetic acid and 1 to 5% by weight of alum (M ¹ A ¹ (So ₄ ) ¹² H ₂ O) based on the total weight of the colorant mixture. Colorant mixture for coloring.