JPH0834682A - Colored terrazzo - Google Patents

Abstract

PURPOSE:To produce a colored terrazzo causing no peeling, swelling and discoloring of a coloed film and excellent in weather resistance, stability, wearresistance, etc., without using a cement colorant such as pigment by forming a specified colored film on a surface of a terrazzo with a cement substance used as a binder. CONSTITUTION:A water soluble metal sulfate (e.g. iron sulfate) aq. soln. selected from among groups IB, VIB, UIIB and VIIIB in the periodic table is preferably applied on the surface of the terrazzo with the cement substance used as the binder to form the colored film consisting essentially of the metal sulfate and/or its reaction product on a cement part. After applying the metal sulfate aq. soln., setam aging is preferably executed appropriately at 60-80 deg.C.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a colored terrazzo prepared by applying an aqueous metal sulfate solution on the surface of terrazzo to form a colored film mainly containing metallic sulfate and / or a reaction product thereof on the cement portion. .

[0002]

2. Description of the Related Art Terrazo is a kind of artificial stone that is made by kneading a seed stone such as marble, granite, serpentine, etc. with a cement material and hardening it, and polishing the surface. It is widely used for the inner and outer walls of buildings, floors, etc. as the interest in the landscape and beauty of objects increases.

There are two types of terrazzo: a terrazzo that is plastered and ground by a plasterer at the construction site and a terrazzo that is factory-made. However, most of the terazos are produced at the factory these days due to a shortage of craftsmen. In factory production, for example, about one-third of the surface layer mortar is put into the mold provided in the molding machine, degassed by applying vibration, and the back layer mortar is put into the mold all the way to add it. It is manufactured by a method in which the surface is polished after being pressed and molded and cured, and crushed stone such as marble, granite, and serpentine with a particle size of 2 to 12 mm is used as the aggregate of the seed stone in the surface layer. . In addition, normal aggregate is used for the back layer. In addition, in terrazzo, there are those in which the cement portion is colored (colored) and those in which it is not colored. For the colored terrazzo, color cement colored with a coloring agent such as a pigment is used.

However, when the conventional terrazzo is used outdoors, the cement part absorbs water, and free water and alkali content remaining at the time of manufacture are exuded (eluted) on the terrazo surface, and weathering and white flower phenomenon occur. Due to its difficulties, it is usually used inside buildings. When a coating material is applied to prevent exudation, such a phenomenon can be suppressed primarily, but swelling, peeling, deterioration, etc. of the coating film occur and there is a problem in durability.

As a method of improving such problems,
Japanese Unexamined Patent Publication No. 61-291477 proposes a terrazzo in which cement mixed with ultrafine powder is used, the cement is hardened densely, and a surface is coated with a photocurable resin after polishing. This method aims to densify the cement part by using ultrafine powder to prevent water and alkali content from seeping out to the surface, and to further improve the problem physically by coating a photocurable resin. Therefore, it is not sufficient as an essential measure for improving the exudation of free alkali content caused by cement and the difficulty caused by the coating film, and there is room for further improvement.

[0006]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a colored terrazzo that can chemically solve the above-mentioned problems and can perform coloring at the same time.
The present inventors have been able to improve the exudation of free alkali content caused by cement and the difficulty caused by a coating film, and have excellent long-term weather resistance and stability without being peeled off from the colored film, which is resistant to abrasion. We have earnestly studied for the purpose of developing colored terrazzo.

[0007]

As a result, after the terrazzo finish, a metal sulfate aqueous solution is applied to form a colored film containing a metal sulfate and / or its reaction product as a main component on the cement portion. It was found that the problems can be solved by applying a steam curing after application to form a colored film containing metal sulfate and / or its reaction product as a main component on the cement part, and that this colored film is extremely dense and strong. Then, the present invention has been achieved. The present invention is a colored terrazzo prepared by applying an aqueous metal sulfate solution to the surface of terrazzo having a cement material as a binder to form a colored film containing metal sulfate and / or its reaction product as a main component on the cement portion. Regarding The present invention also applies a metal sulfate aqueous solution to the surface of terazo, which uses a cement material as a binder, and steam-cures it to form a colored film containing metal sulfate and / or its reaction product as a main component on the cement portion. The present invention relates to colored terrazzo.

In the present invention, the details of the coloring mechanism in which the color development is accelerated and an extremely dense and strong colored film (layer) is formed in the cement portion of the terrazzo at an early stage are not sufficiently clear, but the hydration reaction of the cement is not clear. Free Ca produced by
(OH) ₂ reacts with the metal sulfate and is consumed to form fine crystals of the metal hydroxide, which develops color, and together with calcium sulfate and other reaction products that are produced at the same time, minute crystals in the cement portion of the surface layer It is presumed that the surface layer is densified by entering the gaps, and a film layer having a color peculiar to a salt of a microcrystalline hydroxide salt is formed on the surface for coloring. In addition, it is presumed that in the hydroxide of the microcrystal, the hydroxyl group is bonded or substituted with oxygen in air or water and a part of the hydroxide becomes a microcrystal of the oxide and is mixed in the surface layer.

The colored terrazzo of the present invention is produced by finishing the terrazzo by polishing and then treating the surface of the terrazzo with a metal sulfate.

The metal sulfate used in the present invention is a water-soluble metal sulfate, preferably 1 of the periodic table.
A water soluble metal sulfate selected from the group consisting of Group B, Group 6B, Group 7B and Group 8 is used. Specific examples of the metal sulfates include water-soluble metal sulfates such as copper sulfate, chromium sulfate, manganese sulfate, iron sulfate, cobalt sulfate and nickel sulfate. The metal sulfates may be used alone or in combination as an aqueous solution.

The metal sulfate aqueous solution is applied to the surface of terrazzo. When applied, the color develops and a colored film is formed on the surface of the terrazzo. The coating method is not particularly limited, but, for example, a method such as brush coating or spraying is usually adopted. The coating operation may be performed once or repeatedly. Further, the kind of the metal sulfate may be partially changed and applied. Various colored patterns can be formed by these operations.

The concentration of the aqueous metal sulfate solution is in the range of 2% by weight (anhydrous basis) to the saturated concentration or less, preferably 5%.
It is appropriately selected and used from the range of 30% by weight in consideration of color tone. Generally, the lower the density, the darker the color tone, and the darker the color tone, but when the concentration is less than 2% by weight, almost no coloration occurs. The coating amount varies depending on the condition of the terrazzo-finished surface, the type of metal sulfate, the concentration of the metal sulfate aqueous solution, etc.
^{1 to} 150 g, preferably 20 to 100 g per m ² is suitable. If the coating amount is too small, coloring will be insufficient,
Further, even if the amount is excessively increased, the color tone is not particularly changed. Further, in the present invention, the weathering of terrazzo and the white flower phenomenon can be suppressed because the free alkali content is reacted with the metal salt and consumed, and at the same time the elution from the inside to the surface is densified and the colored film. It is presumed that it is blocked by.

In the present invention, coloring is promoted by steam curing after applying the metal sulfate aqueous solution. The steam curing may be performed any time after the application of the metal sulfate aqueous solution, but it is preferable that the surface of the terrazzo be in a wet state from the viewpoint of the coloring effect. The temperature of steam curing is 40 to 90 °.
C, preferably 60 to 80 ° C., and a relative humidity in the range of 60 to 98% are suitable for early formation of a colored film having a stable color tone. The steam curing time is usually 30 minutes to 24 hours, preferably 40 minutes to 4 hours, though it varies depending on the temperature, the curing atmosphere and the like.

In the present invention, before or after the application of the metal sulfate aqueous solution, the surface of the terrazzo is treated with an alkaline aqueous solution or an aqueous solution of an oxidizing agent and steam-cured, whereby the color development is further promoted and the surface is neutralized. Even if it is too dry or too dry, the coloring effect can be further enhanced, and a strong colored film with stable color tone can be generated earlier.
Further, the treatment with the alkaline aqueous solution or the aqueous solution of the oxidizing agent may be either before or after the application of the aqueous solution of metal sulfate, but before the application, the absorption of the aqueous solution of metal sulfate into the cement portion is also less likely to occur It is preferable because the amount of the salt aqueous solution applied is small.

The alkaline aqueous solution has a pH of 8 or more,
An alkaline aqueous solution having a pH of 10 or more is preferably used. If the pH is too low, there is almost no color-promoting effect due to the alkali treatment, so it is preferable to use an alkaline aqueous solution having a high PH. As the treatment method, a method of applying to the surface of terrazzo is adopted, and normally, for example, brush coating,
A method such as spraying is adopted. The coating operation may be performed once or repeatedly.

The coating amount of the alkaline aqueous solution varies depending on the condition of the terrazzo-finished surface, the pH of the alkaline aqueous solution, the viscosity, the drying rate, etc., but the terrazzo surface area to be treated is 1 m ^2.
20 to 2000 g, preferably 50 to 500 g, is suitable. If the coating amount is too small, the effect of alkali treatment cannot be expected, and if it is too large, the metal sulfate component cannot penetrate into the interior of the concrete, which is not preferable.

The alkaline substance used for preparing the alkaline aqueous solution may be any one that is water-soluble and has a pH of the aqueous solution of 8 or more, preferably 10 or more. Specific examples of the alkaline substance include hydroxides of alkali metals such as sodium hydroxide and potassium hydroxide, sodium bicarbonate (bi) carbonate, (bi) carbonates of alkali metals such as (bi) potassium carbonate, and sodium metasilicate. , Silicates of alkali metals such as potassium metasilicate, hydroxides of alkaline earth metals such as water glass, calcium hydroxide, magnesium hydroxide and strontium hydroxide, oxidation of alkaline earth metals such as calcium oxide and magnesium oxide The thing etc. can be mentioned. Moreover, these may be a mixture. Sludge and sludge water discharged from the cement concrete factory can also be used. Among the alkaline substances, calcium oxide, calcium hydroxide, sludge, sludge water, etc. are also one of the components of the concrete product, and thus are particularly preferably used.

As the aqueous solution of the oxidizing agent, a strongly oxidizing aqueous solution in which a solid or liquid oxidizing agent is dissolved in water is preferably used. Those having weak oxidizing power cannot be expected to have further effects by the activator. The treatment with the aqueous solution of the oxidant is performed by applying it to the surface of terrazzo. Usually, it is carried out by a method such as brush coating or spraying.
The coating operation may be performed once or repeatedly.

The coating amount of the aqueous solution of the oxidizing agent varies depending on the surface condition, the kind and the concentration of the oxidizing agent, etc., but is ^{20 to} 2000 g, preferably 50, per 1 m ^{2 of the} surface area of the product to be treated.
~ 500g is preferred. Further, those having a concentration of 0.5 to 30% by weight are preferably used. If the coating amount is too small, the effect cannot be expected, and if it is excessively large, the metal sulfate component cannot penetrate into the interior of the terrazzo, which is not preferable.

Typical examples of the oxidizing agent include hydrogen peroxide, sodium nitrite, calcium peroxide, bleaching powder and chlorates such as sodium chlorite, sodium hypochlorite and sodium chlorate. .

In the present invention, as the cement material used for producing terazo, white Portland cement, ordinary Portland cement, early strength Portland cement,
Examples of the medium-grade Portland cement, low heat Portland cement, belite type Portland cement, blast furnace cement, fly Ayu cement and the like, and various Portland cements are usually used appropriately.

As the seed stone, usually, marble, granite, serpentine, obsidian, andesite, etc. are used, but not limited to these, various crushed stones can also be used. The size of the seed stone is not particularly limited, but the particle size is 0.5.
-30 mm, preferably 2-12 mm are used.

[0023]

The colored terrazzo of the present invention is an ultrafine powder or a coating material,
It is not necessary to use a cement colorant such as a pigment, the colored film does not peel, swell, discolor or deteriorate, and is excellent in long-term weather resistance, stability, and abrasion resistance. At the same time, weathering and white flower phenomenon can be prevented. Further, the colored terrazzo of the present invention has a beautiful color pattern in which the surface of the colored film layer of the cement portion and the natural stone of the seed stone (crushed stone) are in harmony, so that it can be used as an inner or outer wall or flooring material of a building. Very suitable.

[0024]

EXAMPLES In each example, the white sinter test, color development effect, discoloration and appearance inspection were carried out by the following methods to evaluate the colored terrazzo plate. [White flower test] Temperature 7 ° C, relative humidity 50%,
Set the wind speed to 0.1 to 0.2 m / s, set it so that about 1/2 of the thickness of the colored terrazzo plate is immersed in ion-exchanged water, leave it for 2 weeks, and observe the occurrence of white sinter. In Table 2, occurrence of white sinter was observed, and none was not observed. . [Coloring effect] The degree of coloration of the colored terrazzo plate after the coloring treatment and leaving it for one day and night was visually observed, and in Table 2, good was marked with ◯ and extremely good was marked with ⊚. [Discoloration and Appearance Inspection] Using a carbon ax sunshine weather meter (manufactured by Gas Tester Co., Ltd.), a colored terrazzo plate is treated for 1500 hours to obtain discoloration (discoloration), surface condition, etc. The appearance was inspected, and in Table 2, those having a good surface condition without peeling or discoloration of the colored layer were regarded as good, and those having the colored layer peeled were regarded as peeled.

Example 1 A mold of 20 × 20 × 4 cm was used, and 1 from the bottom plate of the mold.
The surface mortar having the composition shown in Table 1 was charged to a height of about / 3 and deaerated while applying vibration. Next, the back layer mortar was poured in until the rest of the mold was full, the surface was flattened, and the mold was depressurized by pressurizing it with a pressure of about 100 kg / cm ² . After demolding, sufficient curing was performed in water for 5 days, and then the surface layer was polished by a polishing machine to produce a terrazzo plate. After that, it was dried for a whole day and night, and an iron sulfate aqueous solution having a concentration of 20% by weight was sprayed at a rate of 100 g per 1 m ² for coloring treatment and left overnight at room temperature to obtain a colored terrazzo plate having a yellowish brown colored film on the cement portion. . With respect to the obtained colored terrazzo plate, the presence or absence of white sinter, the coloring effect, the fading property, and the appearance were evaluated. The results are shown in Table 2.

Examples 2 and 3 Cement was prepared in the same manner as in Example 1 except that a chromium sulfate aqueous solution (Example 2) and a manganese sulfate aqueous solution (Example 3) were used in place of the iron sulfate aqueous solution of Example 1. A colored terrazzo plate having a colored film on a part thereof was obtained. Table 2 shows the evaluation results of the obtained colored terrazzo plate.

Example 4 Similar to Example 1 except that the terrazzo plate of Example 1 was sprayed with an aqueous solution of iron sulfate and then steam-cured for 4 hours under the conditions of a temperature of 60 ° C. and a relative humidity of 80%. A colored terrazzo plate having a colored film on the cement portion was obtained. Table 2 shows the evaluation results of the obtained colored terrazzo plate.

Example 5 Cement was carried out in the same manner as in Example 1 except that 100 g of cement sludge water was sprayed on the terrazzo plate of Example 1 per 100 m ² for alkali treatment, followed by coloring treatment with an aqueous iron sulfate solution. A colored terrazzo plate having a colored film on a part thereof was obtained. Table 2 shows the evaluation results of the obtained colored terrazzo plate.

Example 6 Instead of the cement sludge water of Example 5, the concentration was 3% by weight.
A colored terrazzo plate having a colored film on the cement portion was obtained in the same manner as in Example 1, except that the hydrogen peroxide solution was used as an oxidizing agent, and then the coloring treatment was performed with an iron sulfate aqueous solution. Table 2 shows the evaluation results of the obtained colored terrazzo plate.

Comparative Example 1 A colored terrazzo plate was obtained in the same manner as in Example 1 except that the urethane resin coating was sprayed for the coloring treatment instead of the coloring treatment with the iron sulfate aqueous solution of Example 1. Table 2 shows the evaluation results of the obtained colored terrazzo plate.

[0031]

[Table 1]

[0032]

[Table 2]

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Koichiro Yamato 1-12-32 Nishihonmachi, Ube City, Yamaguchi Prefecture Ube Headquarters Ube Head Office (72) Inventor Yoshinori Nakajima 1-12-1 Nishihonmachi, Ube City, Yamaguchi Prefecture No. 32 Ube Kosan Co., Ltd.Ube Head Office

Claims (2)

[Claims] 1. A coloring method comprising applying a metal sulfate aqueous solution to the surface of terrazzo having a cement material as a binder to form a colored film containing metal sulfate and / or its reaction product as a main component on the cement portion. Terrazo. 2. A surface of terazo containing a cement material as a binder is coated with an aqueous solution of metal sulfate and steam-cured to form a colored film containing metal sulfate and / or its reaction product as a main component on the cement portion. Colored terrazzo that can be made.