KR102138140B1 - Manufacturing method of salt tile - Google Patents

Abstract

The present invention relates to a manufacturing method of a salt tile having flexural strength of 3.5 MPa or more and a salt tile according to the method, wherein the manufacturing method of a salt tile comprises the following steps of: a) preparing a mixture by mixing finely divided salt and flower salt mixed powder and water glass; b) press molding the mixture; and c) drying and curing the press-molded mixture.

Description

Manufacturing method of salt tile {Manufacturing method of salt tile}

The present invention relates to a method of manufacturing salt tiles.

Recently, not only saving resources to preserve the global environment, but also environmental pollution caused by air pollution and fine dust caused by industrialization is also environmentally friendly to safely protect human health from harmful chemicals, heavy metals, and environmental hormones absorbed by the human body. Building materials and supplies, for example, ocher mat, charcoal mat, and the like are used a lot.

However, the above products are produced by attaching a powder of a specific component with an adhesive to a non-woven fabric or by performing a chemical coating process, and the efficacy and effect are remarkably low and the powder of the specific component is scattered on the surface when used for a certain period of time. Have problems.

Accordingly, a salt tile is used as an eco-friendly building material, and the salt tile is manufactured by using salt that can be used for food as a main component, and can be used for health care purposes. Salt tiles for this purpose are mainly used in which the salt component is 80% or more of the total tile component.

However, the salt tile containing 80% or more of salt component has a high rate of defective products due to cracking or cracking due to lack of strength during the production process, and in the case of the produced salt tile, it melts in a high temperature and high humidity environment to cause deformation of the product. In addition, there are problems that durability is significantly reduced.

Accordingly, there is a need for a method of manufacturing a salt tile having excellent strength and being able to prevent deformation in various environments, thereby improving durability.

KR 10-0794322 B1 (2008.01.07)

An object of the present invention is to provide a method of manufacturing a salt tile that improves the strength of a salt tile, exhibits excellent durability even in a high temperature and high humidity environment, and implements various colors, as well as radioactive removal and moisture absorption effects.

The present invention provides a method of manufacturing a salt tile having a flexural strength of 3.5 MPa or more, the method of manufacturing,

a) preparing a mixture by mixing a mixed powder of refined salt and kosher salt with sodium silicate;

b) press molding the mixture; And

c) drying and curing the press-molded mixture;

It includes.

In one embodiment according to the present invention, the fine powder may have an average particle size of 1 to 10 μm, and an average particle size of the flower salt may be 100 to 300 μm.

In one embodiment according to the present invention, the weight ratio of the fine salt and flower salt in the fine powder and flower salt mixed powder may be 1: 0.1 to 1: 10.

In one embodiment according to the present invention, the press molding is performed at a pressure of 70 MPa or more, and the curing may be performed at 70 to 200°C.

In one embodiment according to the present invention, the mixture may include 5 to 20 parts by weight of water glass (based on 30% by weight of solids) with respect to 100 parts by weight of the unsalt and flower salt mixed powder.

In one embodiment according to the present invention, the mixture may contain 1 to 10 parts by weight of zeolite (Zeolite) with respect to 100 parts by weight of the unsalt and flower salt mixed powder.

In one embodiment according to the present invention, the mixture may include 0.2 to 10 parts by weight of one or more substances selected from illite and pigment, based on 100 parts by weight of the unsalt and mixed salt of flower salt.

In one embodiment according to the present invention, the mixture may include 10 to 30 parts by weight of white cement (White cement) with respect to 100 parts by weight of the unstained salt and flower salt mixed powder.

The present invention also provides a salt tile prepared according to an embodiment of the present invention, wherein the salt tile has a flexural strength of 3.5 MPa or more.

Salt tile according to the present invention has the advantage of significantly improving the interfacial properties of each composition, not only exhibits excellent strength, but also does not cause problems such as deformation even in a high temperature and high humidity environment.

In addition, the salt tile according to the present invention is not only capable of implementing various colors, but also has the advantage of exhibiting excellent radioactive removal and moisture absorption effect.

Even if the effects are not explicitly mentioned in the present invention, the effects described in the specification expected by the technical features of the present invention and the inherent effects thereof are treated as described in the specification of the present invention.

Unless otherwise defined in the technical terms and scientific terms used in the present specification, those skilled in the art to which the present invention pertains have the meanings commonly understood, and the subject matter of the present invention in the following description and the accompanying drawings. Descriptions of well-known functions and configurations that may unnecessarily obscure are omitted.

In addition, the singular form used in this specification may be intended to include the plural form unless otherwise specified in the context.

In addition, the units used without specific mention in the present specification are based on weight, and for example, the units of% or ratio mean weight percent or weight ratio, and weight percent is any one component of the entire composition unless otherwise defined. It means the weight percent occupied in the composition.

In addition, the numerical range used in the present specification is a lower limit and an upper limit and all values within the range, increments logically derived from the shape and width of the defined range, all of the limited values, and the upper limit of the numerical range defined in different forms. And all possible combinations of lower limits. Unless otherwise specified in the specification of the present invention, values outside the numerical range that may occur due to experimental error or rounding of values are also included in the defined numerical range.

The term “includes” in the present specification is an open description having an meaning equivalent to expressions such as “have”, “includes”, “haves” or “makes a feature”, and elements not additionally listed, No material or process is excluded.

In addition, the term'substantially' in the present specification means that other elements, materials or processes not listed with the specified elements, materials or processes are unacceptable to at least one basic and novel technical idea of the invention. It means that it can be present in an amount or extent that does not have a significant effect.

Unless otherwise defined in the present invention, the salt tile means that the content of fine salt and flower salt is 80% by weight or more of the total salt tile. Therefore, the content of components other than the salt component cannot exceed 20% by weight of the total salt tile.

As described above, the salt tile currently in use has a low strength, and there is a problem in that durability is remarkably deteriorated due to a problem of melting and deformation in a high temperature and high humidity environment. However, the salt tile according to the present invention, by using the mixed powder of fine salt and flower salt and water glass as main components, improves the interfacial properties of each composition and not only significantly improves the strength, but also has problems such as deformation in a high temperature and high humidity environment. Since it does not occur, durability also has an advantage that can be significantly improved.

The salt tile prepared according to the present invention exhibits a high bending strength of 3.5 MPa or more. Here, the flexural strength is a value measured by the KS F 4419 standard and refers to the maximum strength of the salt tile affected by the load stress since it is the maximum stress that the salt tile can maintain before fracture. Generally, a salt tile having a bending strength of 2.6 MPa or less is commercialized, but a salt tile having a purpose of the present invention of 3.5 MPa or more has never been manufactured.

Specifically, in the step a), through the process of mixing the fine powder and the flower salt mixed powder and water glass, the interface salt between the fine powder and flower salt particles having different average particle sizes is significantly lowered so that the fine powder particles are added to the flower salt. It can be uniformly dispersed between the particles. Accordingly, not only the particles can be uniformly mixed, but the finely mixed finely divided salt and flower salt powders can exhibit strong bonding properties through water glass. Specifically, the water glass may mean an aqueous sodium silicate solution having a solid content of 15 to 30% by weight. When the mixed powder of finely divided salt and flower salt having different average particle sizes is mixed with the water glass, the water glass can serve as a binder, and thus can significantly reduce the interfacial tension between the fine powder and flower salt particles. In addition, strong bonding and fusion between each particle is easily performed, so that each of the particles can be combined with a high bonding force.

On the other hand, when the sodium silicate powder is mixed with the finely divided salt and flower salt to prepare a salt tile by pressing and heating, due to high interfacial tension between different particles, bonding and fusion between the compositions is not well achieved, and the mixture is Even if molding is performed under the press molding conditions according to the present invention, there is a problem that the strength is significantly reduced.

Specifically, in the present invention, the fine powder may have an average particle size of 1 to 10 μm, preferably 1 to 8 μm, and even more preferably 1 to 5 μm. Also, the flower salt may have an average particle size of 100 to 300 μm, preferably 150 to 300 μm, and more preferably 200 to 300 μm. In the above range, not only the finely divided salt and flower salt particles are more uniformly mixed, but also well dispersed in the water glass, thereby providing a base material of a salt tile having high strength, which further enhances the next step of press molding and drying. You can proceed efficiently. Due to this effect and the sufficient wetting effect of the water glass with the mixed particle interface of fine powder and flower salt in the composition range according to the present invention, it is possible to manufacture the salt tile of the high strength of the present invention.

Specifically, the mixture may include 5 to 20 parts by weight of water glass, preferably 5 to 15 parts by weight, and more preferably 5 to 10 parts by weight with respect to 100 parts by weight of the unsalt and flower salt mixed powder. Water glass in the above range can perform a better role as a binder, so that the fine powder and flower salt powders can be compression molded with a stronger bonding force, and can also exhibit high strength after compression molding. The water glass is described based on water glass based on 30% by weight of solids.

Among the fine powder and flower salt mixed powder, the weight ratio of fine powder and flower salt may be 1: 0.1 to 1: 10. In the above range, finely-stained particles having a relatively small average particle size may be compression molded in a state uniformly permeated between flower salt particles having a relatively large average particle size.

Through the process of press-molding the mixture described above in step b), compression molding may be performed to have a specific shape. The press molding method is not particularly limited, but specifically, a hydraulic press molding apparatus may be used. Specifically, the press molding process may be performed at a pressure of 70 MPa or more. The molding frame used for the press molding may be circular, elliptical or polygonal, but is not limited thereto. In addition, the average thickness of the salt tile produced by the molding frame may be 100 to 500 mm, preferably 100 to 300 mm, even more preferably 150 to 250 mm. The salt tile manufactured to have the thickness range may not easily break or crack.

In the step c), the initial drying process of the salt tile is performed through the drying process on the press-molded mixture, and salt tiles having higher strength can be manufactured through a curing process to be performed thereafter. Specifically, the drying may be performed at room temperature and humidity 40 to 50% for 24 hours, but is not limited thereto.

Next, through the process of curing the initial dried mixture, a salt tile having a bending strength of 3.5 MPa or more, which is an object of the present invention, can be prepared. The curing may be performed at 70 to 200°C, preferably 80 to 150°C, preferably 100 to 120°C for 1 to 5 hours, preferably 3 to 5 hours. In the above range, the bending strength of the press-molded salt tile can be increased to 3.5 MPa or more, and when a long time is used, it is possible to prevent the problem of powder scattering of the salt component on the surface of the salt tile. After the curing step, a cooling step may be additionally performed. Specifically, it can be naturally cooled for 4 hours or more at room temperature, but is not limited thereto.

In the method for preparing a salt tile according to the present invention, the mixture may further include a zeolite. Specifically, the mixture may include 1 to 10 parts by weight of zeolite, preferably 2 to 7 parts by weight, based on 100 parts by weight of the unsalt and flower salt mixed powder. In the above range, the problem of deterioration in the dispersibility of the zeolite does not occur, and thus a sufficient hygroscopic effect can be exhibited. In the case of the mixture in which the zeolite is mixed, the surface roughness of the salt tile is reduced to increase the surface uniformity of the tile, and friction When the powder is desorbed, it decreases. Specifically, the type of the zeolite is not particularly limited, and examples thereof include salts containing metal ions such as sodium, potassium, calcium, strontium, and barium. Specifically, [K,Na][(AlO ₂ )(SiO ₂ )]nH ₂ O or Na[(AlO ₂ )(SiO ₂ )]nH ₂ O, but is not limited thereto.

In the method for preparing a salt tile according to the present invention, the mixture may further include at least one material selected from illite and pigment. Specifically, the mixture may include 0.2 to 10 parts by weight of one or more substances selected from illite and pigments, based on 100 parts by weight of the unsalt and flower salt mixed powder. More specifically, the mixture is a radioactive material by containing 0.2 to 10 parts by weight, preferably 1 to 10 parts by weight, and more preferably 1 to 6 parts by weight, based on 100 parts by weight of the unsalt and flower salt mixed powder. By efficiently adsorbing cesium and radon, it is possible to exhibit a radioactive removal effect.

In addition, the above-mentioned mixture contains 0.2 to 10 parts by weight of pigment, preferably 0.5 to 10 parts by weight, and even more preferably 0.5 to 5 parts by weight, with respect to 100 parts by weight of fine powder and flower salt mixed powder, thereby improving the strength, moisture absorption, and It is possible to implement various colors while maintaining the effect of removing radioactivity, so it can exhibit an interior effect. The pigment may be an organic pigment or an inorganic pigment, and may be used without particular limitation, and may include pigments of respective colors such as red, yellow, orange, blue, green, purple, black, and white pigments. Specifically, as organic pigments, azo-based pigments such as monoazo-based, diazo-based, condensed diazo-based, diketopyrrolopyrrole-based, phthalocyanine-based, isoindolinone-based, isoindolin-based, quinacridone-based, indigo-based, and thio Polycyclic pigments such as indigo-based, quinophthalone-based, dioxazine-based, anthraquinone-based, perylene-based, and perinone-based pigments can be used. Carbon black pigments such as furnace black, lamp black, acetylene black, and channel black can be used as inorganic pigments. , Titanium dioxide, and the like, but are not limited thereto.

In the method for preparing a salt tile according to the present invention, the mixture may further include a back cement. Specifically, the mixture may include 10 to 30 parts by weight of the back cement with respect to 100 parts by weight of the unsalt and flower salt mixed powder. Preferably 15 to 30 parts by weight, more preferably by containing 20 to 30 parts by weight, it is possible to increase the bending strength, it is possible to improve the durability in a high temperature and high humidity environment. In particular, when adding back cement, the zeolite, illite, and pigment have an increased adhesive strength with a salt component, thereby increasing the penetration of water glass during press molding due to the surface affinity with water glass, thereby further increasing the strength after drying and curing.

In general, commercially available salt tiles have a flexural strength of about 1.5 to 2.6 MPa, so they are easily broken or broken. However, the salt tile prepared according to the present invention is manufactured by undergoing compression molding and curing by a high pressure press molding method by adding water glass to the unsalt and flower salt mixed powder, thereby exhibiting a flexural strength of 3.5 MPa or higher, much higher than that of commercially available salt tiles. Have an advantage

Specifically, the salt tile according to the present invention may include 5 to 20 parts by weight of water glass and 1 to 10 parts by weight of zeolite with respect to 100 parts by weight of the unsalt and flower salt mixed powder. In addition, the salt tile may further include 0.2 to 10 parts by weight of one or more substances selected from illite and pigment, based on 100 parts by weight of the unsalt and flower salt mixed powder, and 10 to 30 of white cement It may further include parts by weight.

The salt tile according to the present invention may have a bending strength of 3.5 MPa or more, preferably 3.8 MPa or more. Here, the flexural strength is a value measured according to the KS F 4419 standard, and generally exhibits a much higher strength than the flexural strength of a commercially available salt tile, so that durability in various environments can be significantly improved.

Hereinafter, the present invention will be described in detail through examples, but these are for explaining the present invention in more detail, and the scope of the present invention is not limited by the following examples.

A mixture was prepared by mixing 500 g of unsalted salt, 200 g of flower salt, and 60 g of liquid sodium silicate, and after adding the mixture to a molding die, compression molding was performed at a pressure of 70 MPa using a hydraulic press. Next, after drying for 24 hours at 25° C. and 45% humidity, salt was cured at 100° C. for 5 hours to prepare a salt tile having a final thickness of 200 mm and a size of 200 Ⅹ 110 mm.

In Example 1, instead of using 500 g of fine salt, 455 g was used, and the same was prepared except that 40 g of illite and 5 g of pigment were further added to the mixture.

In Example 1, instead of using 500 g of fine salt, 460 g was used, and 40 g of zeolite was prepared in the same manner, except that more was added to the mixture.

In Example 3, instead of using 460 g of finely ground salt, 360 g was used, 150 g was used instead of 200 g of flower salt, and the same preparation was performed except that 150 g of back cement was further added to the mixture. Did.

(Comparative Example 1)

It was prepared in the same manner as in Example 1, except that sodium silicate powder was used instead of liquid sodium silicate.

(Comparative Example 2)

It was prepared in the same manner as in Example 1, except that 700 g of purified salt was used instead of fine salt, flower salt, and liquid sodium silicate.

(Experimental Example 1)

<Bending strength measurement>

The salt tiles prepared according to Examples 1 to 4 and Comparative Examples 1 and 2 were measured for bending strength according to the KS F 4419 standard and the results are shown in Table 1.

Flexural strength (MPa) Example 1 3.8 Example 2 4.1 Example 3 4.8 Example 4 5.5 Comparative Example 1 2.6 Comparative Example 2 1.5

As can be seen in Table 1, in the case of a salt tile prepared according to the present invention, it can be confirmed that it exhibits a flexural strength of about 1.5 times or more compared to Comparative Examples 1 and 2, and it can be confirmed that the strength was significantly improved. In addition, when adding the back cement according to Example 4, it can be seen that the strength of the salt tile was further increased.

(Experimental Example 2)

<durability evaluation>

After the salt tiles prepared according to Examples 1 to 4 and Comparative Examples 1 and 2 were left at 40°C and 80% humidity for 48 hours, the flexural strength was measured in the same manner as in Experimental Example 1, and the results are shown in Table 2 It is shown in.

Flexural strength (MPa) Salt tile produced after drying and curing After leaving 40℃/80%/48hr
Salt tile Example 1 3.8 3.5 Example 2 4.1 3.8 Example 3 4.8 4.4 Example 4 5.5 5.2 Comparative Example 1 2.6 1.8 Comparative Example 2 1.5 0.8

As can be seen in Table 2, in the case of a salt tile prepared according to the present invention, even after leaving for 48 hours in a high-temperature and high-humidity environment, a value of 90% or more was maintained compared to the initial strength, whereas in Comparative Examples 1 and 2 It can be seen that the flexural strength value was significantly reduced. That is, it can be seen that the durability of the salt tile according to the present invention is significantly improved.

Claims (9)

a) preparing a mixture by mixing fine powder and flower salt mixed powder and liquid water glass;
b) press-molding the mixture; And
c) drying and curing the press-molded mixture; a method of manufacturing a salt tile comprising:
The salt tile has a bending strength of 3.5MPa or more,
The fine salt has an average particle size of 1 to 10 μm, and the flower salt has an average particle size of 100 to 300 μm,
Method for producing salt tile in which the content of fine salt and flower salt is 80% by weight or more of the total weight of the salt tile. delete According to claim 1,
Method for preparing salt tile in which the weight ratio of fine salt and flower salt in the mixed powder is 1: 0.1 to 1: 10. According to claim 1,
The press molding is performed at a pressure of 70 MPa or more, and the curing is a method of manufacturing a salt tile performed at 70 to 200°C. According to claim 1,
The mixture is a method for preparing a salt tile comprising 5 to 20 parts by weight of a liquid water glass containing 30% by weight of solid content, based on 100 parts by weight of the fine powder and flower salt mixed powder. According to claim 1,
The mixture is a method of manufacturing a salt tile comprising 1 to 10 parts by weight of zeolite with respect to 100 parts by weight of the unsalt and flower salt mixed powder. According to claim 1,
The mixture is a method of manufacturing a salt tile comprising 0.2 to 10 parts by weight of one or more substances selected from illite and pigment, based on 100 parts by weight of the unsalt and flower salt mixed powder. According to claim 1,
The mixture is a method of manufacturing a salt tile comprising 10 to 30 parts by weight of the back cement, with respect to 100 parts by weight of the unsalt and flower salt mixed powder. A salt tile prepared by the method for manufacturing a salt tile according to any one of claims 1 to 3 to 8.