JP2002274978A - Fine finishing method for cementitious molding - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fine finishing method for continuously manufacturing cement moldings having inorganic coloring finished surfaces without delamination in a manufacturing line. SOLUTION: The fine finishing method for the cementitious molded goods has a first process step for applying and penetrating an aqueous solution of a colorable metal salt compound on the surfaces of the cementitious molded goods regulated to a surface temperature 40 to 90 deg.C and a surface moisture content <=10 wt.%, a second process step of applying and penetrating a weakly alkaline liquid of 7<; pH <=10 to the surfaces of the cementitious molded goods by regulating the surface temperature of the cementitious molded goods to 40 to 90 deg.C and the surface moisture content to <=10 wt.% and a third process step of accelerating reaction by regulating the surface temperature of the cementitious molded goods to 40 to 90 deg.C and the surface moisture content to <=10 wt.%.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an inorganic colored cosmetic finishing method capable of continuously performing cosmetic treatment on the surface of a group of cement-based molded products using a production line.

[0002]

2. Description of the Related Art As a conventional coloring method of a cement molded product, coloring by mixing a pigment at an ambient temperature and room temperature environment,
Coloring with a solvent-based acrylic resin, acrylic silicone resin, fluorine resin, or the like, coloring with a water-based acrylic resin, acrylic silicon resin, a fluorine resin, or the like, coloring with a metal salt, and the like have been performed. However, in the case of these conventional methods, for example, in the case of the pigment mixing method, if it is performed on one production line, the production efficiency is deteriorated when switching colors. Further, there is a problem that efflorescence is generated from Portland cement, resulting in uneven finish.

Means for solving such problems include solvent-based acrylic resin paint, solvent-based acrylic silicone resin paint, solvent-based fluororesin paint, water-based acrylic resin paint, water-based acrylic silicone resin paint, and water-based fluororesin paint. Has been painted. In addition, it is apparent from the appearance that these materials are coated, and since they are coated, there are problems such as fading and peeling due to aging.

[0004] Separately from the above method, Japanese Patent Application Laid-Open No. 48-6862
No. 0 proposes a method of coloring by applying a metal sulfate. Since this method is a chemical reaction, there is no problem of discoloration or peeling, but it takes time to develop color. In addition, an old cement product having a low activity has a problem that it does not form a color or that the color is unevenly generated.

Further, another method is disclosed in Japanese Patent Application Laid-Open No. H08-2909.
No. 84 also discloses a method in which coloring is promoted by treating with an alkali and an oxidizing agent before or after the application of an aqueous solution of metal sulfate. Since this method is carried out under strongly alkaline conditions, a powdered color-forming inorganic product is produced on the surface, and the surface comes off when rubbed. This phenomenon is presumed to be due to the fact that the metal sulfate reacts very quickly, so that the reaction occurs on the surface before the penetration is sufficient. In addition, when a resin is applied to the surface layer in such a state, adhesion to a cement-based molded product is deteriorated, and peeling occurs.

[0006]

An object of the present invention is to form a color-penetrating layer by suppressing the reaction which proceeds extremely quickly in the above-mentioned inorganic coloring method, and allowing the coating solution to react while penetrating from the surface to the inside. The present invention provides a surface cosmetic finishing method capable of suppressing the generation of powdered peelable coloring inorganic products on the surface and producing a cement molded product having a stabilized colored finishing surface without peeling. It is intended to do so.

[0007]

The present invention for achieving the above object includes the following inventions.

(1) The surface of a cement-based molded article adjusted to a surface temperature of 40 to 90 ° C. and a surface water content of 10% by weight or less, preferably 5% by weight or less, more preferably 3% by weight or less, has a coloring property. The first step of applying and permeating an aqueous solution of a metal salt compound, and then setting the surface temperature of the cement-based molded product to 4
After adjusting the surface moisture content to 0% to 90 ° C and the surface water content to 10% by weight or less, preferably 5% by weight or less, more preferably 3% by weight or less, a weakly alkaline liquid having a pH of 7 <pH ≦ 10 is applied to the surface of the cement-based molded article. A second step of causing a reaction with the coloring metal salt compound by application and permeation, and then a surface temperature of the cement-based molded article of 40 to 90 ° C. and a surface water content of 10% by weight or less, preferably 5% by weight or less , More preferably 3% by weight
A cosmetic finishing method for a cement-based molded product, comprising a third step of adjusting the following.

(2) Following the third step, there is provided a fourth step of forming a polished surface by applying a clear liquid to the cement-based molded article according to (1). Finishing method.

(3) The second step is a step of applying a weakly alkaline clear liquid as a weakly alkaline liquid and permeating it to cause a reaction between the weakly alkaline liquid and the coloring metal salt compound, and at the same time, performing a polishing process. The method for aesthetically-finishing a cement-based molded product according to (1), which is characterized in that:

(4) In the second step, before the weak alkaline liquid is applied and impregnated, a silane-based waterproofing material is applied and impregnated as an intermediate coating material on the surface of the cement-based molded product, and the surface temperature is 40 to 9
0 ° C., surface water content 10% by weight or less, preferably 5% by weight
Below, more preferably adjusted to 3% by weight or less, while a waterproof layer made of the silane-based waterproofing material is not formed, further weakly alkaline liquid is applied and permeated, surface temperature 40 to 90 ° C, surface water content 10% by weight or less. By adjusting the concentration to preferably 5% by weight or less, more preferably 3% by weight or less, a reaction between the weak alkaline liquid and the coloring metal salt compound is caused, and at the same time, a waterproof layer is formed by the silane-based waterproof material. The cosmetic finishing method for a cement-based molded product according to any one of (1) to (3), which is a step.

(5) The clear liquid is a clear liquid capable of forming a clear layer having a hiding ratio of 0 to 50% as measured after coating with a 6 mil applicator and drying. The cosmetic finishing method for a cement-based molded product according to any one of (2) to (3).

(6) The coloring metal salt compound is a transition metal coloring water-soluble sulfate or nitrate, especially water-soluble manganese sulfate, ferrous sulfate, chromium sulfate, copper sulfate, nickel sulfate, or cobalt sulfate. , Silver nitrate, manganese nitrate, iron nitrate,
The cosmetic finish of a cement-based molded article according to any one of the above items (1) to (4), which is at least one selected from chromium nitrate, copper nitrate, nickel nitrate and cobalt nitrate. Method.

(7) The weak alkaline liquid is a weak alkaline liquid containing at least one compound selected from an alkali metal hydroxide, an alkaline earth metal hydroxide, and ammonia ( Item 1) The method for aesthetically-finishing a cement-based molded product according to any one of items 1) to 6).

(8) A colored cement-based molded article produced by the method according to any one of the above items (1) to (7).

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In the first step of the method of the present invention, the surface layer including the surface of a cement-based molded article is heated to adjust the surface temperature to 40 to 90 ° C. and the surface moisture content to 10% by weight or less. This is the step of inflating the air in the surface layer portion of the molded article and applying and permeating the aqueous solution of the coloring metal salt compound in that state. By reducing the surface moisture content of the cement-based molded article, the permeability of the aqueous metal salt solution is improved, and the chemical reaction zone is extended from the surface to the inside. Also,
When the temperature is higher than room temperature, the reaction between the metal salt in the permeated metal salt aqueous solution and the cement component is promoted, and coloring is performed.

The temperature adjustment by heating in the first step is performed from the viewpoint of ensuring that the surface moisture content is dried to 10% by weight or less and that the penetration depth of the aqueous metal salt solution is sufficient. Preferably, the reaction is carried out at 80 ° C. Further, the surface water content needs to be adjusted to 10% by weight or less, but is particularly preferably adjusted to 5% by weight or less.

As the coloring metal salt compound used in the first step of the present invention, a water-soluble coloring metal salt compound such as a water-soluble transition metal sulfate or nitrate can be used. Ferrous sulfate, chromium sulfate,
Copper sulfate, nickel sulfate, cobalt sulfate, silver nitrate, manganese nitrate, iron nitrate, chromium nitrate, copper nitrate, nickel nitrate,
Cobalt nitrate is a preferred compound.

The concentration of the aqueous solution of the coloring metal salt compound is from 2 to
25% by weight is preferred. When the concentration is lower than 2% by weight, a colored layer having a sufficient color density cannot be formed. When the concentration is higher than 25% by weight, the colorable metal salt compound becomes supersaturated or the metal salt crystal precipitates on the surface of the molded article. In addition, a powdered inorganic product is formed by the reaction in the second step and the third step, and peels off when rubbed, which is not preferable.

The most suitable method for applying the aqueous solution of the coloring metal salt compound is spraying. Although brushing, dipping, and the like can be considered, brushing tends to cause unevenness in brushing and suction, and dipping has a disadvantage that a reaction occurs in an aqueous solution of a coloring metal salt compound. As a spraying method, application by a low-pressure coating machine with less scattering and high application efficiency is particularly preferable.

In the present invention, the coating amount of the aqueous solution of the coloring metal salt compound is not particularly limited, and is generally 50 to 300 g.
/ M ² , but is usually selected from 70 to 180.
g / m ² is preferred. If the coating amount is too small, a sufficient colored layer cannot be obtained due to the reaction with the alkali in the second step and the third step, and if it is too large, unevenness in accumulation and sagging occurs.

In the second step of the present invention, the surface of the cement-based molded article in which the aqueous metal salt solution is applied and permeated in the first step is heated to a surface temperature of 40 to 90 ° C. and a surface water content of 10% by weight. Or less, preferably 5% by weight or less, more preferably 3% by weight or less.
This is a step in which a weak alkaline liquid is applied and permeated in a state adjusted to not more than% by weight to color the surface layer of the cement molded article by an inorganic chemical reaction between the weak alkaline liquid and the coloring metal compound.

The weak alkaline liquid used can be used without any particular limitation as long as it can react with the coloring metal salt to form a pigment component. Examples of the weakly alkaline liquid include alkali metals such as sodium and potassium, hydroxides of alkaline earth metals such as calcium and magnesium, and aqueous solutions of ammonia and the like, but are less likely to remain in colored molded articles. Ammonia water is preferably used. The use amount of the weak alkali is not particularly limited as long as the colorable metal salts can be completely converted into the coloring substance, and usually, the equivalent amount is equal to or more than the total amount of the alkali components in the cement with respect to the colorable metal salts. Amount is used.

The third step of the present invention is a step of further promoting the reaction between the coloring metal salt and the weak alkaline liquid in the surface layer portion of the cement molded article by heating from the second step in which the weak alkaline liquid is applied and penetrated. is there. The cosmetic finishing step of the cement-based molded article of the present invention can be basically completed by the first step and the second step. However, the heat treatment in the third step promotes the reaction,
It is preferable because coloring can be further ensured.

In the cosmetic finishing step of the cement-based molded article of the present invention, a method in which the third step is added to the first step and the second step or both steps is sufficient as long as it is limited only to the color finishing. However, when the purpose is to produce a glossy building material component such as a building material, simply forming a color-developed state by reaction with a weakly alkaline liquid may result in a slightly inferior gloss. The present invention also provides a method capable of forming a glossy colored finish on the cement-based colored molded article.

In the method of the present invention, as a method for forming a glossy finished surface on a cement-based colored molded article, in a second step, a weakly alkaline liquid and a highly weatherable water-based acrylic There is a method of applying a colorless or colored clear liquid (overcoat material) such as a silicone resin or a fluorine resin. According to this method, it is possible to simultaneously perform color development by the reaction between the coloring metal salt and the alkali and polishing of the surface portion.

The colorless or colored clear liquid used in the above-mentioned polishing method can form a clear layer having such transparency that the colored surface of the cement-based molded product can be seen through. It is preferable that the material be a material capable of forming a clear layer having a hiding ratio of 0 to 50% as measured after coating with a 6 mil applicator and drying. A material that forms a layer having a hiding factor of more than 50% has no difference from a normal paint finish. According to such a method, unlike the case of a uniform surface coloring finishing method using a paint system, a cement-based molded article that is not only glossy but also has a uniform coloring state and a natural-like appearance is formed. It is possible to

Further, as another method of the present invention capable of forming a cement-based molded product having a natural appearance as described above, the method according to the present invention is characterized in that, prior to the application of the weakly alkaline liquid in the second step, the intermediate coating material is used. As a silane-based waterproofing material is applied to the surface of a cement molded product impregnated with an aqueous solution of a coloring metal compound, and is dried by heating.While a waterproof layer has not yet been formed, a weak alkaline liquid or a weak alkaline clear liquid is used. By applying and finally heating and drying at 40 to 90 ° C. to promote coloring and formation of a waterproof layer, in addition to natural appearance, prevention of secondary efflorescence, prevention of neutralization, salt damage It is also possible to form a cement-based molded product having improved durability, which also has functions such as prevention and freezing prevention.

[0029]

EXAMPLES Hereinafter, the cosmetic finishing method for a cement-based molded article of the present invention will be described with reference to examples, but the present invention is not limited to these examples.

Example 1 (First Step: Application of Metal Salt Aqueous Solution) Two 2 cm thick 1: 2 mortar plates were prepared and cured for 3 days, and the prepared mortar plates were heated to 60 ° C. in a drier. The water content in the surface layer was adjusted to 3% by weight. Next, a 20% aqueous solution of manganese nitrate as a metal salt aqueous solution was spray-coated at a rate of 150 g / m ^{2 on} each mortar plate surface by a low-pressure coating machine and allowed to permeate. As a result, a color-forming reaction occurred, and the surface became light brown. .

(Second Step: Application of Weak Alkaline and Strong Alkaline Aqueous Solutions) The surface temperature of the mortar plate colored in light brown was adjusted to 60 ° C. and the surface moisture content was adjusted to a dry state of 3% by weight. On one side, 100 g of weakly alkaline ammonia water of pH 9 was used as a reactant by a low-pressure coating machine.
/ M ² was spray coated, pH and the other of the mortar plate surface
12 g of 5% solution of strong alkali caustic soda 100 g / m ²
Was applied by spraying to cause a brown coloring reaction.

(Third Step: Acceleration of Coloring Reaction) Both mortar plate surfaces were heated to 60 ° C. and dried so that the water content in the surface layer became 3% by weight. The coloring reaction by the alkali was further accelerated, and the brown color became deeper. The coloring depth of the surface layer was 1.8 mm with aqueous ammonia. In the case of a reaction with a caustic soda solution that is a strong alkali, the color became darker, but a powdered inorganic product was generated on the surface, and the coloring depth was 0.1%.
It was as shallow as 5 mm. This was presumed to be due to the fact that in the case of a strong alkali, the reaction was rapidly performed, so that the reaction occurred on the surface and the permeation was inhibited.

Example 2 (First step: Application of aqueous solution of metal salt) Seven 1: 2 mortar plates having a thickness of 2 cm were prepared in the same manner as in Example 1, cured for 3 days, and then dried by a drier. 5% by weight of water contained in the surface layer
And adjust each plate to a surface temperature of 40 ° C to 100 ° C.
Heat treatment was performed at each stage, and heating was performed at each temperature. Then, on each mortar plate heated at each temperature,
A 20% aqueous solution of manganese nitrate as a metal salt aqueous solution was sprayed and applied at a rate of 150 g / m ² by a low-pressure coating machine and permeated, and the surface was colored light brown.

(Second Step: Application of Weak Alkaline Aqueous Solution) Each mortar plate prepared in the first step was adjusted to a surface temperature of 60 ° C. and a water content of a surface layer of 5% by weight with a drier, and then to a metal salt. Aqueous ammonia having a pH of 9 was applied as a reactant at a rate of 100 g / m ² by a low-pressure coating machine to the surface to which the aqueous solution was applied, and the surface was colored brown.

(Third Step: Acceleration of Coloring Reaction) Each mortar plate surface was heated again to 60 ° C. and adjusted so that the water content in the surface layer portion was 5% by weight. The coloring reaction with a weak alkali was accelerated, and the brown color became deeper. Each mortar plate was split, and the coloring depth of the surface layer was measured using calipers.
Table 1 shows the results.

[0036]

[Table 1]

Example 3 (First Step: Application of Metal Salt Aqueous Solution) A 2 cm thick 1: 2 mortar plate was prepared, cured for 3 days, and then heated by a dryer to a surface temperature of 60 ° C. 5% by weight of moisture contained in surface layer
Was adjusted. Subsequently, a 150 g / m ² aqueous solution of copper sulfate as a metal salt aqueous solution was sprayed onto the mortar plate surface with a low-pressure coating machine at 150 g / m ² to be permeated.
A color development reaction occurred, and the surface turned pale blue.

(Second Step: Application of Weakly Alkaline Water Absorption Preventing Material Solution) The mortar plate colored in pale blue was further adjusted to a surface temperature of 60 ° C. and a surface water content of 5% by weight, and reacted with a low-pressure coating machine. Aqueous solution prepared by adding ammonia water to a water-based silane-based water-absorbing preventive (manufactured by Kowa Chemical Industry Co., Ltd .: CONFIX SW-7W) as an agent to adjust the pH to slightly alkaline at 80 was used.
g / m ^{2 was} applied to cause a coloring reaction.

(Third Step: Promotion of Coloring Reaction) The colored mortar plate from the second step was further heated to adjust the surface temperature to 60 ° C. and the surface water content to 5% by weight. The coloring reaction with the weak alkali was accelerated, and the blue color became further deeper. As a result, a colored mortar plate having a waterproof layer depth of 3 to 5 mm and a coloring penetration depth of 1.8 mm was obtained.

Example 4 (First Step: Application of Metal Salt Aqueous Solution) A 2 cm thick 1: 2 mortar plate was prepared, cured for 3 days, and then heated by a dryer to a surface temperature of 60 ° C. 5% by weight of moisture contained in surface layer
Was adjusted. Then, a 15 g / m ² aqueous solution of copper sulfate as a metal salt aqueous solution was sprayed onto the mortar plate surface with a low-pressure coating machine at 150 g / m ² to infiltrate the mortar plate.
A color development reaction occurred, and the surface turned pale blue.

(Second Step: Application of Weakly Alkaline Clear Solution) The mortar plate produced in the first step is further heated to adjust the surface temperature to 60 ° C. and the surface moisture content to 5% by weight, Acrylic silicone resin clear adjusted to pH 9 as weakly alkaline as a reactant and polishing agent [acrylic silicone resin 74.0% by weight, water 17.0% by weight, small amount of additives (dispersant, preservative, defoamer) 9% by weight], an anti-settling agent, a film-forming aid, aqueous ammonia)
/ And ^{m 2} spray application.

(Third Step: Acceleration of Coloring Reaction) The colored mortar plate produced in the second step was further heated to adjust the surface temperature to 60 ° C. and the surface water content to 5% by weight. The blue color becomes deeper and the color penetration depth is 1.
A mortar board having a glossy finished surface with a light and shade of the base of 8 mm was obtained.

Example 5 (First Step: Application of Metal Salt Aqueous Solution) A 2 cm thick 1: 2 mortar plate was prepared, cured for 3 days, and then heated by a dryer to a surface temperature of 60 ° C. , Surface moisture content is 5% by weight
Was adjusted. Then, a manganese nitrate 20% aqueous solution 150 g / m ² was spray-coated on the surface of the mortar plate by a low-pressure coating machine and allowed to penetrate.
It became light brown.

(Second Step: Application of Weakly Alkaline Color Clear Solution) The mortar plate prepared in the first step is further heated to a surface temperature of 60 ° C. and a surface water content of 5% by weight.
Then, an acrylic silicone resin color clear [acrylic silicone resin 73.0% by weight, brown pigment] adjusted to have a weak alkalinity of pH 9 for the purpose of causing a coloring reaction with alkali and at the same time eliminating glaze and color unevenness. 1.0% by weight, 17.0% by weight of water, 9% by weight of a small amount of additives (dispersing agent, preservative, defoaming agent, anti-settling agent, film-forming aid, ammonia water, etc.)] at 150 g / m ^2. did.
The surface layer of the mortar plate becomes more brown due to the reaction with the weak alkali, and the color clear layer has a good transparency of the base and the color is light and dark, and it is evenly uniform. A mortar plate having a finished surface and a coloring penetration depth of 1.8 mm was obtained.

(Third Step: Acceleration of Coloring Reaction) The colored and polished mortar plate obtained in the above step was further heated at 60 ° C. to form a mortar plate having a darker brown colored layer. .

Example 6 (First step: application of an aqueous solution of metal salt) A 2 cm thick 1: 2 mortar plate was prepared and cured for 3 days. The rate was adjusted to 3% by weight. Then, a 150 g / m ² aqueous solution of manganese nitrate was spray-coated on the surface of the molded article by a low-pressure coating machine to cause permeation.

(Second Step 1: Application of Water-Silane-Based Water Absorption Preventing Material)

The mortar plate prepared in the first step was further heated to a surface temperature of 60 ° C. and a surface water content of 3% by weight. Next, a water-based silane-based water-absorbing preventive material [Kowa Chemical Industry Co., Ltd.
80g / m2 from Comp. SW-7W]
Was applied by spraying. By drying by heating to a surface temperature of 60 ° C. and a surface water content of 3% by weight, the water-based silane-based water-absorbing preventive material as an intermediate coating material is 3 to 8 mm inward from the surface.
To some degree. However, even after the heating and drying, the reaction of the waterproof material did not start, and the waterproof layer was not yet formed.

(Second Step 2: Application of Weakly Alkaline Color Clear Solution) The same weakly alkaline color clear solution as used in Example 5 was applied to the mortar plate from the above (First Step 1) at 150 g / g. and m ² applied was allowed rise to color development reaction with a weak alkali. A mortar plate having a darker brown colored surface layer was obtained.

(Third Step: Acceleration of Coloring Reaction) Next, the surface of the colored mortar plate from the second step 2 was kept at 80 ° C. for 5 minutes by heating and dried. The formed color clear layer had a unique finish surface with a light and transparent undertone, a light and dark undertone, an evenness, and a different shade from the ordinary paint finish. Surface coloring penetration depth 1.8mm
A colored waterproof mortar board was obtained.

The colored waterproof mortar board finished according to the process of Example 6 was tested for water resistance, alkali resistance, acid resistance, accelerated weather resistance and the like. Evaluation of water resistance After curing the finished mortar board for one day, JIS K56
63 was immersed in water for 7 days and water resistance was observed.
No blistering or peeling was observed.

Evaluation of alkali resistance After curing the finished mortar board for one day, it was subjected to JIS K56.
Dipped in a calcium hydroxide saturated solution for 7 days with 63,
Although alkali resistance was observed, no cracks, blisters, peeling, softened solutes, etc. were observed.

Evaluation of Acid Resistance After the finished mortar board was cured for one day, it was subjected to JIS K54.
The sample was immersed in a 5% sulfuric acid solution for 1 day according to No. 00 to check the acid resistance, but no cracks, blisters, peeling, softened solutes, etc. were observed.

Evaluation of Neutralization The surface of the finished mortar plate other than the coated surface was sealed with an epoxy-based paint, cured for 7 days, and then subjected to Asahi Kagaku Co., Ltd. The sample was placed in a CO2 concentration atmosphere for one month, the test piece taken out was split in half, and the inside was not neutralized even when a phenolphthalein solution was sprayed on the cross section.

Evaluation of freeze-thaw resistance After the finished mortar board was cured for 7 days, it was subjected to JIS K14.
According to the freeze-thaw test (water-air) method of No. 35, 500 cycles were performed, but no whitening, blistering, cracking, peeling, and the like were observed.

Evaluation of Accelerated Weathering Resistance After the finished mortar board was cured for 7 days, an accelerated weathering test was performed for 2000 hours using a xenon weatherometer (manufactured by Atlas), but no cracking or peeling of the coating film was observed. The retention was 80% or more and the color difference was 3 or less.

(Hidden finish of color clear)
When investigating the concealing rate and finish of the color clear, it was found that the concealing rate of the color clear that can achieve uniformity while hiding the unevenness of the mortar plate surface was optimally 8 to 50%.

[0058]

According to the present invention, there is provided a finishing method which can be applied to the line painting finishing in the field of coloring cement-based molded articles, for example, exterior wall materials, roofing materials, etc., and has high designability and high weather resistance. It is possible.

Continued on the front page (72) Inventor Yasushi Kamo 1-9-13 Kita-Kojiya, Ota-ku, Tokyo Kowa Chemical Industry Co., Ltd. Central Research Laboratory (72) Inventor Yasuo Mori 6-27-11 Omorikita, Ota-ku, Tokyo Mori Shoji Within the Company (72) Inventor Kei Toi 6-27-11 Omorikita, Ota-ku, Tokyo F-term (reference) 4G028 DB14 FA04

Claims (7)

[Claims] 1. A surface temperature of 40 to 90 ° C. and a water content of 10
A first step of applying and permeating an aqueous solution of a coloring metal salt compound onto the surface of a cement-based molded product adjusted to not more than 10% by weight;
A second step of adjusting the surface water content to 90 ° C. and a surface water content of 10% by weight or less, and applying a weak alkaline solution having a pH of 7 <pH ≦ 10 to the surface of the cement-based molded product to cause a reaction with the coloring metal salt compound; And a third step of adjusting the surface temperature of the cement-based molded article to 40 to 90 ° C. and the surface water content to 10% by weight or less to promote the reaction between the weak alkaline liquid and the coloring metal salt compound. A method for finishing cosmetics molded articles. 2. The method according to claim 1, further comprising a fourth step of applying a clear liquid to form a polished surface following the third step. . 3. The second step is a step of applying a weakly alkaline clear liquid as a weakly alkaline liquid and permeating the same to cause a reaction between the weakly alkaline liquid and the coloring metal salt compound, and at the same time, performing a polishing process. The method for finishing cosmetics of a cement-based molded product according to claim 1, wherein: 4. In the second step, a silane-based waterproofing material is applied and impregnated as an intermediate coating material on the surface of the cement-based molded product before the weak alkaline liquid is applied and permeated, and the surface temperature is 40 to 90.
° C, the surface moisture content is adjusted to 10% by weight or less, and while a waterproof layer made of the silane-based waterproofing material has not yet been formed, a weak alkaline solution is further applied and penetrated to obtain a surface temperature of 40 to 90 ° C and a surface moisture content of 10% by weight. The step of forming a waterproof layer with the silane-based waterproof material at the same time as causing a reaction between the weakly alkaline liquid and the colorable metal salt compound by adjusting the following: The cosmetic finishing method for a cement-based molded product according to any one of the preceding claims. 5. The concealing rate of the clear liquid measured with a 6 mil applicator and measured after drying is 0 to 5.
4. The method according to claim 2, wherein the clear liquid is a clear liquid capable of forming a 50% clear layer. 6. The coloring metal salt compound, wherein the manganese sulfate, ferrous sulfate, chromium sulfate, copper sulfate, nickel sulfate,
4. The composition according to claim 1, which is at least one selected from cobalt sulfate, silver nitrate, manganese nitrate, iron nitrate, chromium nitrate, copper nitrate, nickel nitrate and cobalt nitrate.
The cosmetic finishing method for a cement-based molded product according to any one of items 5 to 5. 7. A colored cement-based molded article produced by the method according to any one of claims 1 to 6.