KR101650765B1 - Blooming preventing and heat shielding artificial-block - Google Patents

Abstract

The present invention relates to an artificial block and a method of manufacturing the same, and more particularly, to a novel artificial block having excellent white balance and heat resistance and a method of manufacturing the same.

Description

{Blooming preventing and heat shielding artificial-block}

The present invention relates to an artificial block and a method of manufacturing the same, and more particularly, to a novel artificial block having excellent white balance and heat resistance and a method of manufacturing the same.

Cement whitening is a phenomenon in which calcium carbonate or alkali metal, which is a soluble component existing in cement and concrete structures, is dissolved in water and is transported to the surface of the structure, and water is evaporated, precipitating in the form of calcium carbonate or soluble alkali metal salt, This phenomenon is called whiteness because it often represents white, which is a major cause of damage to the surface aesthetics of concrete secondary products. When water is added to the cement, the calcium silicate compounds such as Alite and Belite in the cement react with water to form calcium silicate hydrate, and undergo condensation and curing processes over time, . Calcium hydroxide is produced in the process of producing calcium silicate hydrate and dissolved in water. This calcium hydroxide continues to react with the other components of the cement to form hydrates and play an important role in curing. However, in the initial stage, it is dissolved in the pore water existing in the cement hardened body, and thus a saturated solution of calcium hydroxide is produced

Also, in the early stage of hydration reaction, a large amount of free water is generated due to the water added more than necessary in order to secure the quality of the dough, and a part of the water moves to the surface portion of the concrete and is evaporated. At this time, the water evaporates and the cement hydrate fills the remaining space, leaving a minute pore. This pore is called the gel pore and the capillary pore. The presence of these micropores and the calcium hydroxide solution in the pores are known to be the main cause of whitening.

Methods for reducing the whiteness of concrete include methods of compacting the hydration structure of the concrete to reduce voids, methods of adding a fatty acid salt-based waterproofing material in the manufacture of concrete, and applying organic-based coatings or permeable water- And the like. With this technique, Korean Patent No. 10-0981702 relates to an anti-whitening agent in the form of an additive that imparts waterproof performance by adding a fatty acid salt-based waterproofing material such as palmitate, stearate, and oleophate to concrete, Registration No. 1992-000153 discloses that an excessive amount of gypsum is added, and a large amount of expandable ettringite mineral is formed at the beginning of hydration by steam curing, so that the concrete structure becomes dense due to expansion of the gypsum, Capillary pores are reduced to prevent migration of whitening-causing substances to the surface, and at least one of polyvinyl alcohol, alkylcellulose, carboxyl cellulose and methyl cellulose is selectively added as an anti-whitening agent, It is preventing white smoke. In the case of such a waterproofing material, it is impossible to completely fill the capillary pores of the concrete with cement and release materials, and the waterproofing performance is continuously exerted to increase the use amount thereof to prevent whitening, and thus adversely affecting the strength development of the cement- .

In the case of a block of cement material, if water penetrates into the inside, whitening occurs due to a chemical reaction between cement and water. In this case, rainwater is best prevented from penetrating into the block, There is a problem that whitening occurs frequently on the surface of the surface layer due to the moisture coming from the surface.

As a result of efforts to manufacture a new cement block capable of preventing whiteing by exhibiting continuous waterproof performance, the present invention not only reduces the water absorption rate of the block but also blocks moisture penetrating from the outside and / or inside of the block, Which is capable of providing a cementitious artificial block of a new structure type which can be made to have a proper solar radiation reflectivity and an excellent heat shielding effect.

In order to solve the above-mentioned problems, the present invention relates to an artificial block having excellent white balance and heat resistance, comprising: a base layer; A surface layer comprising a first surface layer, a boundary layer and a second surface layer; And an oxidation-treated coating layer are stacked in this order to have a shape.

As a preferred embodiment of the present invention, the artificial block of the present invention may be characterized in that the thickness ratio of the base layer to the surface layer is 1: 0.15 to 0.25, and the surface layer has a thickness ratio of the first surface layer, 0.5 to 1.5: 1 to 2.5.

As a preferred embodiment of the present invention, in the artificial block of the present invention, the base layer comprises 350 to 500 parts by weight of fine aggregate, 20 to 50 parts by weight of water and additives, relative to 100 parts by weight of cement, Cement, and white cement.

As a preferred embodiment of the present invention, in the artificial block of the present invention, the cement is usually a mixture of Portland cement and white cement, and may be contained at a weight ratio of 1: 0.5 to 2.

In the artificial block of the present invention, the base layer may further include a whitening inhibitor, and the whitening inhibitor may be included in an amount of 0.2 to 2 parts by weight based on 100 parts by weight of the cement.

In another preferred embodiment of the present invention, the first surface layer and the second surface layer may contain 10 to 50 parts by weight of water, 30 to 600 parts by weight of dolomite and 100 to 200 parts by weight of copper slag, based on 100 parts by weight of cement , The cement may include at least one kind selected from Portland cement and white cement.

In another preferred embodiment of the present invention, the first surface layer and the second surface layer may further include at least one inorganic pigment selected from an iron oxide-based inorganic pigment and a chromium oxide-based inorganic pigment, 0.1 to 7 parts by weight based on 100 parts by weight of the resin.

In another preferred embodiment of the present invention, the first surface layer and the second surface layer may further comprise a spherical alumina powder and a waste liquid crystal, wherein the spherical alumina powder has an average diameter of 0.1 to 4 탆, And the amount thereof used is 0.1 to 2 parts by weight based on 100 parts by weight of the cement. In addition, the waste water solution may have an average particle size of 1.5 mm to 3 mm, and the amount of the used solution may be 0.5 to 5 parts by weight based on 100 parts by weight of the cement.

In another preferred embodiment of the present invention, the first surface layer and / or the second surface layer further include at least one selected from an alkali metal hydroxide, an inorganic pigment, a water reducing agent, a water reducing agent, a reinforcing agent, an antirust agent and an air entraining agent .

In another preferred embodiment of the present invention, the oxidation-treated coating liquid is coated with an oxidation-treatment coating liquid containing an oxidizing agent, a fluorine-based water-repellent agent and an imidazole-based compound, And 10 占 퐉 or less.

Another aspect of the present invention relates to a method of manufacturing the various types of artificial blocks as described above, comprising the steps of: injecting mortar for a base layer into a mold and then forming a base layer by sintering; A second step of injecting a first surface layer mortar containing cement, water, dolomite and copper slag in a mold having a base layer, while injecting a density improver to form a first surface layer; A third step of performing a vibration damping to form a boundary layer; A second surface layer mortar containing cement, water, dolomite and copper slag is injected into a mold having a boundary layer, followed by vibration densification to form a second surface layer to produce a block; Washing the surface of the block with water to peel the cement on the block surface; 6 steps of curing the surface-cemented blocks; And brushing the cured block; And coating the surface of the brushed block with an oxidation-treatment coating liquid to form an oxidation-treatment coating layer.

As a preferred embodiment of the present invention, in the production method of the present invention, the density improver of the second step may include water; Or a mixed liquid containing water and an anti-whitening agent; Wherein the density enhancer is injected by injecting a part of the first surface mortar into the mold and spraying the density enhancer to the first surface mortar of the remaining part of the mold that is injected into the mold .

In one preferred embodiment of the present invention, the density enhancer is a mixed liquid containing water and an anti-whitening agent, wherein the density enhancer comprises water and an anti-whitening agent in a weight ratio of 1: 0.1 to 0.7.

Also, as a preferred embodiment of the present invention, the density improving agent may be used in an amount of 0.5% to 2% of the weight of the cement in the first surface layer mortar.

According to a preferred embodiment of the present invention, in the manufacturing method of the present invention, in the third step, the vibration compaction is performed by a press containing hot wire, and the surface temperature of the press is 60 ° C to 90 ° C have.

In one preferred embodiment of the present invention, the first superficial mortar and / or second superficial mortar in the second and / or fourth step is a spherical alumina powder having an average diameter of 0.1 mu m to 4 mu m, an average particle size of 1.5 mm to 3 mm And further comprises at least one member selected from the group consisting of water-soluble pigments, coloring agents, alkali metal hydroxides, water reducing agents, anti-whitening agents, and air entraining agents (AE agents).

In one preferred embodiment of the present invention, the curing step of the six steps is a step of curing the substrate at 20 ° C to 60 ° C for 18 to 30 hours or steam curing at 20 ° C to 60 ° C for 1 to 4 hours, followed by drying .

In one preferred embodiment of the present invention, the first to fourth steps are performed within 15 seconds to 30 seconds.

The artificial block of the present invention is excellent in impermeability and can provide an artificial block which is excellent in whitening prevention effect, excellent in heat shielding property, easy to manufacture, and excellent in commerciality, It is possible to provide an eco-friendly product that can recycle the sunglasses.

1A to 1C are schematic views of cross sections of the artificial blocks of the present invention.
Fig. 2 is a photograph of a mold upper plate and a mold lower plate used in the embodiment. Fig.
3 is a photograph showing each of the actual processes for manufacturing the artificial blocks according to the embodiment.
Fig. 4 is a photograph of the upper surface of the artificial block manufactured in Examples 1 to 6. Fig.
FIG. 5 is a schematic view of an experiment for measuring heat resistance performed in Experimental Example 2. FIG.

Hereinafter, the present invention will be described in more detail.

The present invention relates to an artificial block having a structure such as that shown in the schematic view of Figures 1A-1C, comprising a base layer 10; And a surface layer 20 including a first surface layer 21, a boundary layer 23 and a second surface layer 25 or may have a structure of an oxide-coated coating layer (not shown) on one surface of the second surface layer 25 40 or between the second surface layer 25 and the oxidation-resistant coating layer 40. The water-repellent coating layer 30 may further include a water-

The thickness of the base layer and the surface layer of the artificial block of the present invention is 1: 0.15 to 0.25, preferably 1: 0.16 to 0.24, more preferably 1: 0.18 to 0.22, At this time, if the thickness ratio of the surface layer is less than 0.15, the surface of the block may be abraded or the colored layer may peel off. If the thickness ratio of the surface layer exceeds 0.25, there may be a problem that the impact resistance of the block on the surface layer component is rather weak It is preferable to have a thickness ratio within the above range.

The surface layer may be divided into a first surface layer, a boundary layer, and a second surface layer. The first surface layer has a density lower than that of the boundary layer, and mitigates impact transmitted from the boundary layer and the second surface layer to the base layer. The boundary layer is a layer having a relatively high density as compared with the base layer, the first surface layer and the second surface layer, and can block or prevent moisture permeating from the second surface layer to the first surface layer or the base layer, It is possible to block or prevent the water penetrating into the surface layer, thereby minimizing or preventing occurrence of whitening.

The thickness ratio of the first surface layer, the boundary layer and the second surface layer is 1: 0.5 to 1.5: 1 to 2.5, preferably 1: 0.8 to 1.5: 1.2 to 2.5, more preferably 1: 1.5 to 2.5. At this time, if the thickness ratio of the boundary layer to the first surface layer is less than 0.5, it may not be enough to block or prevent moisture sufficiently. If the thickness ratio of the boundary layer exceeds 1.5, the thickness of the first surface layer is too thin, There is a problem that the absorption force against the generated impact decreases so that the impact of the base layer is increased and the mechanical strength of the block is lowered. Therefore, it is preferable to form the boundary layer within the above range. If the thickness ratio of the second surface layer to the first surface layer is less than 1, there may be a problem that the mechanical properties of the entire block deteriorate and the heat resistance of the artificial block is deteriorated. If the thickness ratio of the second surface layer exceeds 2.5 The thickness of the first surface layer and the boundary layer becomes relatively thin, so that the shock absorbing force of the artificial block may be lowered or the effect of preventing the whitening phenomenon may be lowered.

The artificial block of the present invention may include an oxidation coating layer 40 on one surface of the second surface layer 25 or one surface of the waterproof coating layer 30 for antibacterial and mold prevention.

The thickness of the artificial block of the present invention is not particularly limited as it can be appropriately determined according to need, but it is preferable that the thickness of the artificial block of the present invention conforms to the standard of the blocks for the Korean Industrial Standards (KS).

The artificial block of the present invention can be produced by the following method.

The artificial block of the present invention comprises a first step of forming a base layer; A second step of forming a first surface layer; A third step of forming a boundary layer; A fourth step of forming a block by forming a second surface layer; Step 5 to peel the cement on the block surface; 6 steps to cure the block; And brushing the cured block in step 7.

In addition, the method of producing the artificial block of the present invention may further comprise the steps of: 8-1 forming a waterproof layer after step 7; And / or step 8-2 of forming an oxidation-treated coating layer.

As shown in Figs. 3 (a) to 3 (c), the base layer of the first stage can be formed by using a mortar for base layer containing cement, fine aggregate and water and injecting it through a base layer hopper or the like, have. Preferably, the mortar of the base layer contains from 350 to 500 parts by weight of fine aggregate and from 20 to 50 parts by weight of water, preferably from 380 to 450 parts by weight of fine aggregate and from 20 to 50 parts by weight of water 20 To 40 parts by weight. If the amount of the fine aggregate is less than 350 parts by weight, the amount of water may be relatively increased, and there may be a problem that the aggregate is stretched or the formability is poor when compacting or forming for forming the base layer. When the amount is more than 500 parts by weight, Since the amount of cement is relatively insufficient, the aggregate is dried as a whole and the molding is made to be free. However, after the curing, the aggregate may easily break or cause a swelling phenomenon. If the amount of the water is less than 20 parts by weight, the water content of the mortar is too small to mix the cement and fine aggregates. If the water content exceeds 50 parts by weight, the moldability may be deteriorated.

In the mortar of the base layer, the cement may be a mixture of one or two selected from Portland cement and white cement. When mixed, usually Portland cement and white cement are used at a weight ratio of 1: 0.5 to 2 And the ordinary portland cement and the white cement are preferably used as those commonly used in the art.

The mortar for the base layer may further comprise a whitening inhibitor. The anti-whitening agent may be a conventional one used in the art, but preferably 6 to 10% by weight of palmitic acid or its salt, 10 to 14% by weight of stearic acid or its salt, oleic acid or its salt of 11 to 15% 3 to 7% by weight of palmitoleic acid or its salt, 2 to 6% by weight of linoleic acid or its salt, 2 to 6% by weight of diethylene glycol, 1 to 5% by weight of alkylbenzenesulfonic acid or a salt thereof, 1 to 5% by weight of an amide, 0.5 to 1.5% by weight of a myristic acid or a salt thereof, polydimethylsiloxane 0.5 To 1.5% by weight, methyl cellulose 0.1 to 1% by weight, and balance water.

In the anti-whitening agent, the stearic acid is a hard fat component in higher fatty acids, which is hard to dissolve in water at a low temperature, but can form a strong film component and has a function of improving the durability of the waterproof coating. However, stearic acid alone has a difficulty in protecting the liquid form, especially in the winter season. The use of stearic acid or a salt thereof in the cement whitening inhibitor within the range of 10 to 14% by weight is preferable for exhibiting the above performance. The palmitic acid is similar in character to stearic acid, but its melting point is slightly lower than that of stearic acid. Therefore, when it is dissolved (solution), it is possible to improve the stability when it is used in the winter season if it is blended smoothly with stearic acid. Palmitic acid has the effect of forming a strong waterproof coating like stearic acid. The use of palmitic acid or a salt thereof in the cement bleaching inhibitor within the range of 6 to 10% by weight is preferable for exhibiting the above performance. The oleic acid has better liquid stability and water repellency at low temperature than stearic acid and palmitic acid. In addition, it is easy to dissolve in water, and when it is mixed with a hard component hard to dissolve in water such as stearic acid and palmitic acid, it plays a supporting role to enhance the stability of the liquid. It is preferable that oleic acid or a salt thereof in the anti-whitening agent is used in the range of 11 to 15% by weight in order to exhibit the above performance. Myristic acid acts as an emulsifier and serves as a liquid stabilizer for hard fatty acids such as stearic acid and palmitic acid. Myristic acid or its salt in the above-mentioned cement whitening agent is used in an amount of 0.5 to 1.5 It is preferable to use it within the range of from 0.1 to 40% by weight. Palmitoleic acid and linoleic acid are unsaturated fatty acids and are necessary components for exerting water repellency. It is preferable that palmitoleic acid or a salt thereof and linoleic acid or a salt thereof in the cement whitening inhibitor are used in the range of 3 to 7% by weight and 2 to 6% by weight, respectively, in order to exhibit the above performance. And, diethylene glycol is a component necessary for exerting a function as an antifreeze (freezing inhibitor). It is preferable that diethylene glycol is used in an amount of 2 to 6% by weight in order to exhibit the above performance. In addition, polyoxyethylene, alkylbenzenesulfonic acid, and amides improve foamability to exhibit a water reducing effect, and contribute to the improvement of the dispersibility of aggregates and the safety of cement during mixing. The polyoxyethylene, alkylbenzene sulfonic acid, and amide in the anti-whitening agent are preferably used in an amount of 1 to 5 wt%, 1 to 5 wt%, and 1 to 3 wt%, respectively, in order to exhibit the above performance. And, the polydimethylsiloxane forms a waterproof coating structure, contributing to the function as a water repellent and waterproof component. It is preferable that the polydimethylsiloxane is used in an amount of 0.5 to 1.5% by weight in order to exhibit the above performance. In addition, methyl cellulose functions as an auxiliary agent for maintaining the shape retention immediately after block deformation. The content of methylcellulose in the anti-whitening agent is preferably 0.1 to 1% by weight in order to exhibit the above performance. Each of the metal salts may be in the form of a salt with a metal ion, and examples of the metal ion include sodium, potassium, aluminum, sodium, potassium, magnesium, Calcium, magnesium ions and the like are preferable. Particularly when palmitic acid, stearic acid or oleic acid is used as a salt, calcium or an aluminum salt is preferable.

In the mortar for base layer, it is preferable to use 0.2 to 2 parts by weight, preferably 0.5 to 1.2 parts by weight, of the anti-whitening agent relative to 100 parts by weight of cement. In this case, when the amount of anti- By weight, the amount of the antioxidant added is so small that the effect of adding the antioxidant is insufficient, and the antioxidant effect may be sufficient by the boundary layer. Therefore, it is uneconomical to add the antioxidant in an amount exceeding 2 parts by weight.

Next, as shown in d to e in FIG. 3, the first surface layer of the second step is injected through a hopper or the like in the mold in which the first surface layer mortar is formed, and the density- (D) of the first surface layer mortar is injected into the mold (d in FIG. 3), and then the remaining part of the first part of the first part mortar introduced into the mold The first surface layer can be formed by spraying the surface layer mortar with a density enhancer (FIG. 3E). Then, a vibration layer is formed by using a press or the like to form a boundary layer on the upper surface of the first surface layer (step 3). With such a structure, the boundary layer is relatively denser than the first surface layer and the second surface layer, and the density of the first surface layer and the second surface layer is relatively low. During the vibration compaction, the first surface layer mortar introduced into the mold due to the dispersion of the density improver may have a low viscosity and become in a swollen state, so that the mortar may adhere to the surface of the press used for vibration compaction. In order to prevent this, the press including a hot wire may be used. By performing the vibration compaction by setting the surface temperature of the press to about 60 ° C to 90 ° C, preferably 60 ° C to 80 ° C, Can be minimized or prevented from adhering to the surface of the press. At this time, if the surface temperature of the press is less than 60 캜, the effect of preventing the first surface layer mortar from being adhered is greatly deteriorated, and if it exceeds 90 캜, economical efficiency may be deteriorated.

The components of the first surface mortar in the above two stages will be described together with the second surface mortar below. The density improving agent may be water; Or a mixture of water and anti-whitening agent; , And preferably a mixture of water and anti-whitening agent may be mixed and used. More preferably, water and anti-whitening agent are mixed in a ratio of 1: 0.1 to 0.7 by weight, more preferably water And anti-whitening agent in a weight ratio of 1: 0.3 to 0.5. The anti-whitening agent may be a conventional anti-whitening agent used in the art. Preferably, the anti-whitening agent is used in an amount of from 6 to 10% by weight of a whitening agent used in the base mortar, namely, palmitic acid or its salt, stearic acid or its salt 10 To 14% by weight of oleic acid or its salt, 11 to 15% by weight of oleic acid or its salt, 3 to 7% by weight of palmitoleic acid or its salt, 2 to 6% by weight of linoleic acid or its salt, diethylene glycol glycol, 2 to 6 wt%, polyoxyethylene 1 to 5 wt%, alkylbenzenesulfonic acid or its salt 1 to 5 wt%, amide 1 to 3 wt%, myristic acid or 0.5 to 1.5% by weight of a salt thereof, 0.5 to 1.5% by weight of polydimethylsiloxane, 0.1 to 1% by weight of methylcellulose, and water in the balance.

The amount of the density enhancer used is preferably 0.5% to 2%, preferably 0.7% to 1.5% of the weight of the cement in the first surface layer mortar. In this case, If the amount of the density enhancer used exceeds 2% of the weight of the cement in the first surface layer mortar, the amount of the density enhancer used is too large and the drying time is too high. There may be a problem that the first surface layer mortar is not formed. Therefore, it is preferable to use the density improving agent within the above range.

Next, in the manufacturing method of the present invention, in the step 4 of manufacturing the block, a block can be manufactured by forming a boundary layer, then injecting a second surface mortar into the mold, and performing vibration compaction to form a second surface layer , Which can be performed through the same process as the first surface layer forming process (d in FIG. 3 and f in FIG. 3), but the step of forming the boundary layer (e in FIG. 3) is omitted. The four-step vibration compaction may be performed using a press without a heat line, or may be performed in the same manner as the three-step vibration compaction.

The first surface layer mortar of the second stage and the second surface layer mortar of the fourth stage may use mortar having the same composition for the simplification of the manufacturing facility. In order to prevent whitening and other properties of the artificial block of the present invention, Mortar having a composition can also be used.

In the present invention, the first surface layer mortar and / or the second surface layer mortar may include cement, water, dolomite and copper slag, preferably 10 to 50 parts by weight of water, 30 to 600 parts by weight of copper and 100 to 200 parts by weight of copper slag, and more preferably 20 to 35 parts by weight of water, 40 to 500 parts by weight of dolomite and 120 to 180 parts by weight of copper slag, can do. If the content of water is less than 10 parts by weight, the mortar components may not be mixed well. If the amount of water is more than 50 parts by weight, moldability is inferior. Particularly, in the case of the first surface mortar, If the content of water is too large, the formability of the boundary layer is significantly lowered, and the boundary between the first surface layer and the boundary layer becomes ambiguous, so that there may be a problem that physical properties such as impact absorbability of the artificial block are deteriorated. If the dolomite is used in an amount of less than 30 parts by weight, the amount of water may be relatively increased. In this case, there may be a problem that the aggregate is smeared on the molding press plate during molding and the moldability is poor. Although the amount of cement is relatively small, the aggregate may be dried as a whole, which may be advantageous for molding, but there may be a problem that the aggregate easily falls off during the washing process. When the copper slag is used in an amount of less than 100 parts by weight, the appearance of the black aggregate may not be good at the time of washing the surface layer of the artificial block. If the copper slag is used in an amount exceeding 200 parts by weight, Since the surface layer may have a problem in strength, it is preferable to use it within the above range.

The cement of the first surface layer mortar and / or the second surface layer mortar may be used by mixing one kind or two kinds selected from common portland cement and white cement commonly used in the art.

The first surface layer mortar and / or the second surface layer mortar may further include an inorganic pigment using a conventional one used in the art, preferably an iron oxide-based inorganic pigment and a chromium oxide-based inorganic pigment having high tinting strength One or more of them may be used in combination, and the relative tinting strength (test according to EN12878) is preferably 95% to 105%. Examples of the iron oxide-based inorganic pigments include Bayferrox 130C, 318, 330C, 318, 420, 920G, 965C, Blue) and TR-92 (White) are preferably used. Chromium oxide green (Green) is preferably used as the chromium oxide-based inorganic pigment.

The particles of the inorganic pigment have a size of 10 to 20 times the size of the cement particles. The size and shape of the particles may affect the workability in the production of the block, and the particle size of the inorganic pigment may be in the range of 75 탆 to 3,000 탆 It is good to use. In the first surface layer mortar and / or the second surface layer mortar, the amount of the inorganic pigment to be used is preferably 0.1 to 7 parts by weight, preferably 0.5 to 5.5 parts by weight based on 100 parts by weight of the cement, A variety of colors can be realized according to the mixing and usage control of the consumer. Examples of the colors include blue, green, yellow, sepia, silver, orange, pink, crimson, purple, Prussian blue, violet, cobalt blue, , Brown, black, gray, and white.

The first surface layer mortar and / or the second surface layer mortar may further include spherical alumina powder having an average diameter of 0.1 to 4 탆 for improving the heat shielding property, and may be added in an amount of 0.1 to 2 parts by weight per 100 parts by weight of the cement, May be contained in an amount of 0.2 to 1.5 parts by weight. If the amount is less than 0.1 part by weight, the effect of heat shrinkage is insufficient. If the amount is more than 2 parts by weight, the effect of improving the heat resistance is not greatly increased.

The first surface layer mortar and / or the second surface layer mortar may further include a waste liquid clear glass having an average particle size of 1.5 mm to 3 mm for improving heat shielding property. The amount of the used surface fluid is 0.5-5 parts by weight per 100 parts by weight of the cement , Preferably 0.5 to 3 parts by weight. If the amount is less than 0.5 parts by weight, the effect of heat shrinkage is insufficient. If the amount is more than 5 parts by weight, glare may be caused. At this time, the waste liquid can be obtained by pulverizing waste materials of a display such as a TV, a PC monitor, a mobile phone, or the like. For example, liquid crystals adhering to the surface of the waste liquid crystal glass are washed and recovered with an organic solvent such as acetone, and then materials such as metals and organic substances are separated by irradiating plasma or the like to the waste liquid crystal glass, and then the waste liquid crystal is crushed and crushed .

It is advantageous that the spherical alumina powder and / or the wastewater liquid crystal are used only in the second surface layer mortar.

The first surface layer mortar and / or the second surface layer mortar may contain an additive containing at least one selected from the group consisting of an alkali metal hydroxide, a water reducing agent, a reinforcing agent, a rust inhibitor and an air entraining agent (AE agent) It may contain an appropriate amount within a range not adversely affecting the heat shading property.

As the reinforcing agent, inorganic fiber, organic fiber, scrap, high strength rubber steel fiber, glass fiber, carbon fiber and the like can be used to increase the surface strength of the block. As the organic fiber, aramid fiber, polypropylene fiber, vinylon fiber, nylon Can be used.

The rustproofing agent is used to prevent the salinity from being absorbed into the cement when it is used in the cement or in contact with the water or soil containing the salt.

The above-described steps 1 to 4 may be performed for 15 seconds to 1 minute, preferably 15 seconds to 30 seconds, for example, through an automated facility (see, for example, FIGS. 2 and 3) More preferably from 18 seconds to 25 seconds.

Next, step 5 will be described. In step 5, the surface of the block prepared in step 4 is washed with water to peel off the cement on the block surface.

Next, the step 6 is a curing step, which can be carried out using a curing method generally used in the art, but is preferably carried out at 20 ° C to 60 ° C for 18 to 30 hours at room temperature or at 20 ° C to 60 ° C After 1 to 4 hours of steam curing, drying can be carried out. At this time, the curing temperature affects the color of the artificial block. The higher the curing temperature, the lower the intensity of the color than the low vapor pressure or the curing in the air. Therefore, in order to realize the optimum color, It is good.

Next, step 7 of brushing the cured block may be performed.

Next, a method of manufacturing the artificial block of the present invention includes the steps of 8-1 forming a waterproof layer after step 7; And / or step 8-2 of forming an oxidation-treated coating layer.

The waterproofing agent used in the formation of the waterproof layer may be a waterproofing agent generally used in the art, preferably an inorganic filler such as calcium chloride, sodium silicate or silicate powder, an emulsion such as a fatty acid, a metal soap, a paraffin or an asphalt, It is preferable to use an organic water-repellent agent such as a water-soluble emulsion or a rubber emulsion, more preferably an emulsion such as paraffin or asphalt or a rubber emulsion in consideration of the compatibility with the mortar in consideration of adhesion or coating property with the oxidation- .

The oxidation-treated coating layer may be formed by coating with an oxidation-treatment coating solution containing an oxidizing agent, a fluorine-based water repellent agent and an imidazole-based compound. Specifically, the oxidation-treated coating solution may contain 5 to 15% by weight of the oxidizing agent, 8% by weight of the imidazole compound and 85% by weight to 92% by weight of the imidazole compound. At this time, if the content of the oxidizing agent exceeds 15% by weight, the surface of the artificial block may be discolored. If the amount of the fluorine-based water repellent agent is less than 3% by weight, the effect of preventing the occurrence of fungi may be insufficient. If the fluorine-based water repellent agent is used in an amount exceeding 8% by weight, there is no increase in mold prevention effect. The amount of the imidazole-based compound to be used is a value determined by the amount of the other components.

In addition, the oxidation-treated coating layer may further include an appropriate amount of a waste liquid having an average particle size of 0.01 mm to 0.5 mm for improving night visibility, aesthetic appearance, and heat resistance of the artificial block. At this time, if the average thickness and the average diameter of the wastewater liquid crystal are too large, the surface of the oxidation-treated coating layer becomes uneven and the coating layer may be uneven.

Hereinafter, the present invention will be described in more detail with reference to the following examples. However, the following examples should not be construed as limiting the scope of the present invention, and should be construed to facilitate understanding of the present invention.

[ Example ]

Example  1: Manufacture of artificial blocks

(1) Mortar preparation for base layer

24.5 parts by weight of water, 417.6 parts by weight of fine aggregate, and 0.78 part by weight of anti-whitening agent (MSP-20) were mixed with 100 parts by weight of cement to prepare mortar for base layer.

The anti-whitening agent is selected from the group consisting of 8 wt% palmitic acid, 12 wt% stearic acid, 13 wt% oleic acid, 5 wt% palmitoleic acid, 4 wt% linoleic acid, 4 wt% diethylene glycol, 3% by weight of sodium alkylbenzenesulfonate, 2% by weight of amide, 1% by weight of myristic acid, 1% by weight of polydimethylsiloxane, 0.5% by weight of methylcellulose and 40.5% by weight of water.

(2) Preparation of surface mortar

331.8 parts by weight of dolomite, 100 parts by weight of white cement (relative to 100 parts by weight of a white cement having a density of 3.05 g / cm 3, a specific surface area of 3490 cm 2 / g, a compression strength of 14.1 N / 150 parts by weight of slag, 0.99 part by weight of pigment Bayferrox 920 (yellow), 0.99 part by weight of pigment Bayferrox 965 (brown), 1 part by weight of spherical alumina powder having an average diameter of 0.5 to 2 占 퐉 and 1.72 parts by weight of waste water having an average particle size of 1.5 to 3 mm Were mixed to prepare a mortar for surface layer.

(3) Preparation of oxidation coating liquid

An oxidation coating solution containing 5.2% by weight of hydrogen peroxide as an oxidizing agent, 6.4% by weight of a fluorine-based water repellent agent and 88.4% by weight of an imidazole-based compound was prepared.

(4) Manufacture of artificial blocks

Using the mortar for the base layer, the mortar for the surface layer, and the oxidation coating solution, the artificial blocks were produced as follows using the molds shown in the photographs in Fig.

52 kg of the mortar for the base layer was put into a lower layer mold (see the photographs of FIGS. 2 and 3 and a to 3 of FIG. 3) having twelve 20 cm × 20 cm × 10 cm (width × length × depth) Then, as shown in FIG. 3 (c), the base layer was formed by pressing.

Next, as shown in FIG. 3 (d), 10 kg of the surface layer mortar is partially introduced into a mold having a base layer formed thereon through a surface hopper, and then the remaining part of the surface mortar is poured into the mold At the same time, the density improving agent was injected into the surface mortar to be charged.

The density enhancer is a solution prepared by mixing water and an anti-whitening agent at a weight ratio of 1: 0.42, and the anti-whitening agent is the same as the whitening agent used in preparing the mortar for the base layer. The amount of the density improving agent to be added was 1.2% of the weight of the cement used for the surface layer mortar.

Next, the base layer, the first surface layer and the boundary layer were formed by performing vibration compaction with a press at a surface temperature of 75 캜 (see Fig. 3 f).

Next, 10 kg of the mortar for the surface layer is charged into the surface on which the boundary layer is formed through the surface layer hopper as shown in FIG. 3 (d) and FIG. 3 (f), followed by vibration compaction with a press to form a second surface layer, .

Next, as shown in FIG. 3 g, the press and the lower mold were lifted and demolded to prepare a block having a base layer-a first surface layer-a boundary layer-a second surface layer.

Next, the surface of the block was washed with water to remove the cement on the surface of the block, which was then air-cured and dried at 30 ° C to 35 ° C. The weight per block before curing was 6 kg, and the weight after curing was 5.3 kg.

Next, the cured block was brushed and then coated with the oxidation-treatment coating liquid to form an oxidation-treated coating layer, thereby producing a synthetic block.

The manufactured artificial blocks were a base layer (5 cm) - a first surface layer (0.22 cm) - a boundary layer (0.27 cm) - a second surface layer (0.51 cm) - an oxidation-treated coating layer (15 μm). A photograph of the top surface of the manufactured artificial block is shown in Fig. 4 (a). FIG. 4 (a) shows that an orange-based artificial block was produced.

Example  2

Except that 325 parts by weight of dolomite, 155.1 parts by weight of copper slag, 3.31 parts by weight of yellow pigment of Bayferrox 920 (yellow) was added to 100 parts by weight of ordinary portland cement in place of the surface layer mortar of Example 1 in the same manner as in Example 1, , 0.51 part by weight of pigment Bayferrox 965 (brown), 0.95 part by weight of spherical alumina powder having an average diameter of 0.5 to 2 占 퐉 and 1.58 parts by weight of a waste liquid with an average particle size of 1.5 to 3 mm.

The manufactured artificial block was a base layer (5.1 cm) - a first surface layer (0.23 cm) - a boundary layer (0.26 cm) - a second surface layer (0.50 cm) - an oxidation-treated coating layer (15.2 μm). A photograph of the top surface of the manufactured artificial block is shown in Fig. 4 (b). FIG. 4b shows that the artificial block of the yellow system is manufactured.

Example  3

Except that 340.2 parts by weight of dolomite, 142.5 parts by weight of copper slag, 0.51 part by weight of pigment Bayferrox 318 (Black), 100 parts by weight of black pigment were mixed with 100 parts by weight of white cement instead of the surface mortar of Example 1, 1 part by weight of pigment Bayferrox 920 (yellow), 1.5 parts by weight of pigment Bayferrox 965 (brown), 1.10 parts by weight of spherical alumina powder having an average diameter of 0.5 to 2 μm and 1.45 parts by weight of a waste liquid with an average particle size of 1.5 to 3 mm Surface mortar was used.

The manufactured artificial blocks were a base layer (5 cm) - a first surface layer (0.21 cm) - a boundary layer (0.26 cm) - a second surface layer (0.53 cm) - an oxidation-treated coating layer (15.5 μm). A photograph of the upper surface of the manufactured artificial block is shown in Fig. 4 (c). FIG. 4C shows that a brown-based artificial block was produced.

Example  4

Except that 370 parts by weight of dolomite, 140 parts by weight of copper slag, 0.51 part by weight of pigment Bayferrox 318 (Black), 100 parts by weight of black pigment were mixed with 100 parts by weight of white cement instead of the surface mortar of Example 1, 1 part by weight of pigment Bayferrox 920 (yellow), 1.98 parts by weight of pigment Bayferrox TR (white), 1 part by weight of spherical alumina powder having an average diameter of 0.5 to 2 μm and 1.71 parts by weight of a waste liquid with an average particle size of 1.5 to 3 mm Surface mortar was used.

The manufactured artificial block was a base layer (4.9 cm) - a first surface layer (0.22 cm) - a boundary layer (0.25 cm) - a second surface layer (0.52 cm) - an oxidation-treated coating layer (15.3 m) A photograph of the surface is shown in Fig. 4 (d), it can be confirmed that the artificial block of the white system is manufactured.

Example  5

Except that 320 parts by weight of dolomite, 170 parts by weight of copper slag, 4.78 parts by weight of black pigment of Bayferrox 318 (Black), and 100 parts by weight of normal portland cement were used in place of the surface mortar of Example 1, , 0.87 parts by weight of spherical alumina powder having an average diameter of 0.5 to 2 占 퐉 and 1.50 parts by weight of a waste liquid having an average particle size of 1.5 to 3 mm.

The manufactured artificial blocks were a base layer (5 cm) - a first surface layer (0.23 cm) - a boundary layer (0.26 cm) - a second surface layer (0.51 cm) - an oxidation-treated coating layer (15.2 μm). A photograph of the top surface of the manufactured artificial block is shown in Fig. FIG. 4 e shows that a black synthetic block is manufactured.

Example  6

Except that 330.2 parts by weight of dolomite, 150 parts by weight of copper slag and 1 part by weight of Bayferrox 318 (black) were added to 100 parts by weight of ordinary portland cement in place of the surface mortar of Example 1 in the same manner as in Example 1, , 1.98 parts by weight of pigment Bayferrox TR (white), 1.15 parts by weight of spherical alumina powder having an average diameter of 0.5 to 2 占 퐉 and 1.88 parts by weight of a waste liquid with an average particle size of 1.5 to 3 mm.

The manufactured artificial blocks were a base layer (5 cm) - a first surface layer (0.22 cm) - a boundary layer (0.27 cm) - a second surface layer (0.51 cm) - an oxidation-treated coating layer (15.2 μm). A photograph of the top surface of the manufactured artificial block is shown in Fig. 4 (f). It can be seen from FIG. 4F that a gray-based artificial block is manufactured.

Example  7

(5 cm) -the first surface layer (0.26 cm) was formed by using the following mortar and mortar for the base layer in place of the mortar for the base layer and the mortar for the surface layer in Example 1, An orange based artificial block having a boundary layer (0.22 cm) - a second surface layer (0.50 cm) - an oxidation-treated coating layer (15.1 m) was prepared.

The mortar for the base layer was prepared by mixing 30 parts by weight of water, 460 parts by weight of water, and 0.85 part by weight of anti-whitening agent (MSP-20) with respect to 100 parts by weight of cement to prepare mortar for the base layer.

The mortar for the surface layer was composed of 100 parts by weight of white cement (whiteness of 92.5, density of 3.05 g / cm 3, specific surface area of 3490 cm 2 / g, compressive strength at 1 d of 14.1 N / 420 parts by weight of dolomite, 125 parts by weight of copper slag, 1.12 parts by weight of pigment Bayferrox 920 (yellow), 0.95 part by weight of pigment Bayferrox 965 (brown), 1 part by weight of spherical alumina powder having an average diameter of 0.5 to 2 μm and an average particle size of 1.5 to 3 And 1.72 parts by weight of a waste solution of a mill scale were mixed to prepare a mortar for surface layer.

Comparative Example  1: Manufacture of artificial blocks

415 parts by weight of steel making slag aggregate, 1.4 parts by weight of MSP-20 (density 1.045 to 1.075, pH 9 to 12, manufactured by Macho Chemical Industries, Ltd.) as admixture and 42 parts by weight of water were mixed with 100 parts by weight of white cement, .

Next, to 100 parts by weight of the white cement, 190 parts by weight of sand (2.5 to 10 mm), 0.8 parts by weight of MSP-20, 20 parts by weight of water, 0.4 parts by weight of pigment Bayferrox 130C (PR- ) Were mixed to prepare a surface layer mortar.

(5 cm), a surface layer (1 cm), an oxidation-treated coating layer (1 cm), and a surface layer were prepared by using the above-mentioned base mortar and surface mortar in the same manner as in Example 1 except that a boundary layer was not formed. 15 mu m).

Comparative Example  2

(5 cm) -the first surface layer (0.49 cm) -the second surface layer (0.51 cm) was formed by adding the density enhancing agent at the time of forming the first surface layer in the same manner as in Example 1, - An artificial block which is an oxidation-treated coating layer (15.2 占 퐉) was prepared.

Comparative Example  3

15 kg of the surface layer mortar for forming the first surface layer and the boundary layer was used and 5 kg of the surface layer mortar was used for the formation of the second surface layer to prepare an orange synthetic block in the same manner as in Example 1, 1 block (0.44 cm) - the boundary layer (0.37 cm) - the second surface layer (0.18 cm) - the oxidation coating layer (15 m).

Comparative Example  4

An orange colored artificial block was prepared in the same manner as in Example 1 except that 5 kg of surface layer mortar for forming the first surface layer and the boundary layer was used and 15 kg of the surface layer mortar was used for forming the second surface layer, A man-made block having a surface layer (0.22 cm) - a boundary layer (0.19 cm) - a second surface layer (0.60 cm) - an oxidation-treated coating layer (15 m) was prepared.

Comparative Example  5

An orange colored artificial block was prepared in the same manner as in Example 1 except that only 0.3% of the content of the cement in the surface layer mortar was used as the density enhancing agent for forming the first surface layer and the boundary layer, and the base layer (5 cm) ) - boundary layer (0.10 cm) - second surface layer (0.53 cm) - oxidation-treated coating layer (15 m).

Comparative Example  6

3). In the compaction process for forming the first surface layer and the boundary layer, vibration-compaction is performed with a press at a surface temperature of 40 DEG C (see Fig. 3F) (5 cm), a first surface layer (0.24 cm), a boundary layer (0.26 cm), a second surface layer (0.50 cm), and an oxidation-treated coating layer (15.1 占 퐉).

Experimental Example  1: Property evaluation experiment

The bending strength and water absorption rate of the artificial blocks prepared in the above examples were measured and the results are shown in Table 1 below.

The bending strength was measured in accordance with KS F 4419: 2001, and the flexural strength was measured using a concrete flexural strength tester (C090-07N). According to KS F 4419: 2001, the impermeable block (or interlocking block) The flexural strength should be at least 5.0 MPa.

The moisture absorption rate was measured by varying the weight of the artificial block after supporting the base layer of the artificial block downward for 6 hours in a water tank containing water at a depth of 2 cm. This means that a large amount of water is absorbed.

After the bending strength test in accordance with KS F 4419: 2001, two specimens were taken from one specimen and the required weight and weight of the specimen were determined.

In addition, the sensory evaluation was performed by irradiating light in a diagonal 30 ° direction 3 m away from the surface of the artificial block manufactured in the room where the light for photographing was blurred by the light source to see whether the surface of the artificial block was shiny or not. Are shown in Table 1 below.

Also, the impact resistance was evaluated by dropping 3 kg of steel balls into the artificial block, and measuring the number of falls at the time of fracture. The results are shown in Table 1 below. At this time, when the number of times of dropping is one, it is bad, and when the number of drops is two or three times, it is usually good.

division Flexural strength (MPa) Water Absorption Rate (%) Glitter rating Impact resistance Example 1 5.8 4.1 ○ Great Example 2 5.9 3.0 ○ Great Example 3 6.0 4.3 ○ Great Example 4 6.1 5.2 ○ Great Example 5 5.7 4.2 ○ Great Example 6 5.6 4.4 ○ Great Example 7 5.8 5.0 ○ Great Comparative Example 1 5.1 7.6 × Great Comparative Example 2 5.2 8.8 ○ Great Comparative Example 3 5.4 7.3 ○ usually Comparative Example 4 5.3 7.7 ○ usually Comparative Example 5 5.5 7.9 ○ Great Comparative Example 6 5.4 6.2 ○ Poor Where b is the mean width in a direction perpendicular to the point, p is the maximum breaking load (N) shown by the test machine, d is the average of the blocks (3 pl / 2bd ² ) Thickness.
2) water absorption rate = (m _p -m ₁ ) / m ₁ × 100 (%), m _p is the weight of the artificial block before water is loaded,
m ₁ is It is the weight after the artificial block is carried in water for 6 hours.

The results of the tests of Table 1 show that the artificial blocks of Examples 1 to 7 of the present invention are superior in mechanical properties such as flexural strength and impact resistance as compared with artificial blocks of Comparative Examples 1 to 6, It was confirmed that the visibility was excellent.

In addition, in the case of Comparative Example 1, the water absorption rate was very high, and in Comparative Example 2 in which the boundary layer was not formed, the water absorption rate was 7%, which was relatively high as compared with Examples 1 to 6. In the case of Examples 1 to 7 in which the boundary layer was formed on the surface layer, it was confirmed that the water from the base layer to the second surface layer, that is, the water was blocked from moving and the water was not absorbed into the second surface layer. In addition, it was confirmed that the artificial block of the present invention has a structure capable of preventing whitening.

In the case of Comparative Example 3 in which the surface layer had a thickness ratio of the second surface layer to the first surface layer of less than 1: 0.5 and Comparative Example 4 in which the surface layer had a thickness ratio of the second surface layer exceeding 1: 2.5 to the first surface layer, 1, the bending strength and the impact resistance were inferior. In particular, in Comparative Example 4, the second surface layer was relatively thicker than the first surface layer and the boundary layer, and as a result, the boundary layer was inevitably thinned, Absorption rate was high.

Also, in the case of Comparative Example 5 in which the boundary layer was too thin compared to the first surface layer, the water absorption rate was too high as compared with Example 1, and the anti-whitening effect was considerably lowered. In the case of Comparative Example 6 in which the temperature of the press was lower than 60 占 폚, the second surface layer was formed while the boundary layer was not uniformly formed due to adhesion of the mortar to the press due to the introduction of the density enhancing agent for forming the boundary layer, And the second surface layer, and thus the impact resistance is greatly decreased.

Experimental Example 2  : Chaos  Evaluation experiment

The evaluation of the heat resistance of the artificial blocks prepared in the above examples was carried out, and the results are shown in Table 2 below.

The heat shrinkability test was carried out in a room by a method shown schematically in Fig. 5, and the temperature reduction effect of the artificial block was verified. Specifically, experiments were conducted under the conditions of a laboratory temperature of 25 ° C (± 2 ° C) and a relative humidity of 60% (± 5%). Each of the artificial blocks of Examples and Comparative Examples was installed in a testing apparatus as shown in FIG. Line was installed on the surface. Next, an aluminum tape was stuck between the heat insulating material of the test body (see FIG. 5A), and a beam lamp 120W was shot. Temperature changes were measured at intervals of 30 minutes. After 210 minutes, the central surface temperature of the block made of asphalt 60 < 0 > C.

As the asphalt, asphalt AP product of Company H was manufactured to have the same size and thickness as those of the artificial block of the embodiment.

division
(° C) Early 30 minutes 60 minutes 90 minutes 120 minutes 150 minutes 180 minutes 210 minutes Laboratory temperature 20 20.3 20.4 20.5 20.6 20.6 20.6 20.5 Example 1 19.9 31.2 37.1 39.5 43.6 45.2 46.3 47.3 Example 2 20 31.5 36.9 38.8 43.2 44.9 45.7 46.5 Example 3 20 32.4 39.3 43.7 46.1 46.7 47.8 48.9 Example 4 19.9 30.3 35.4 38.1 40.5 41.7 42.9 43.7 Example 5 20.1 34.7 41.6 44.3 45.4 47.3 48.5 49.7 Example 6 20.1 32.6 38.5 42.9 44.3 46.1 47.2 48.6 asphalt 20 39.0 46.6 50.8 55.5 57.4 58.6 60.0 Comparative Example 1 20 34.0 42.9 46.7 48.2 50.3 51.7 53.6

As a result of the test results of Table 2, it can be seen that the artificial blocks of the present invention (Examples 1 to 6) have significantly lower surface temperatures over time than Comparative Example 1 and asphalt blocks. It was confirmed that the artificial block is excellent in heat resistance.

10: Base layer 20: Surface layer 21: First surface layer
23: boundary layer 25: second surface layer 30: waterproof layer
40: Antioxidant coating layer

Claims (7)

understratum; A surface layer comprising a first surface layer, a boundary layer and a second surface layer; And an oxidation-treated coating layer are stacked in this order,
The thickness ratio of the base layer to the surface layer is 1: 0.15 to 0.25,
Wherein the surface layer has a thickness ratio of the first surface layer, the boundary layer and the second surface layer of 1: 0.8 to 1.5: 1.2 to 2.5,
Wherein the base layer is formed of mortar containing 350 to 500 parts by weight of fine aggregate, 20 to 50 parts by weight of water and additives, based on 100 parts by weight of cement, wherein the additive comprises a whitening inhibitor, 0.2 to 2 parts by weight,
Wherein the first surface layer and the second surface layer are formed of a mortar containing 10 to 50 parts by weight of water, 30 to 600 parts by weight of dolomite and 100 to 200 parts by weight of copper slag with respect to 100 parts by weight of cement,
The cement of each of the base layer, the first surface layer and the second surface layer usually contains at least one selected from Portland cement and white cement,
0.5 to 5 parts by weight of spherical alumina powder having an average diameter of 0.1 to 4 占 퐉; And 0.1 to 2 parts by weight of an aqueous waste solution having an average particle size of 1.5 to 3 mm; And at least one selected from the group consisting of
Wherein the oxidation-treated coating layer is coated with an oxidation-treatment coating solution containing 5 to 12 wt% of an oxidizing agent, 3 to 8 wt% of a fluorine-based water repellent agent and 85 to 92 wt% of an imidazole-based compound, Pitcher artificial block.
The impermeable artificial block of claim 1, wherein the cement of the first surface layer and the second surface layer comprises Portland cement and white cement in a weight ratio of 1: 0.5 ~ 2.
The method according to claim 1, wherein the first surface layer and the second surface layer further comprise at least one inorganic pigment selected from iron oxide-based inorganic pigments and chromium oxide-based inorganic pigments,
Wherein the inorganic pigment comprises 0.1 to 7 parts by weight based on 100 parts by weight of the cement.
The anti-whitening and anti-whitening agent according to claim 1, wherein the first surface layer and the second surface layer further comprise an additive containing at least one selected from an alkali metal hydroxide, a water reducing agent, a water reducing agent, a reinforcing agent, Impermeable artificial block excellent in heat resistance.
delete The impermeable synthetic resin block according to claim 1, wherein the oxidation-treated coating liquid further comprises a liquid crystal glass having an average thickness of 0.1 to 5 占 퐉 and an average diameter of 1 to 10 占 퐉.
delete

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