JP3151475B2 - Production method of colored slaked lime for plaster - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a colored slaked lime for stucco applied to, for example, a wall or a roof, and a method for producing the same.

[0002]

2. Description of the Related Art Conventionally, inorganic materials have been widely used since ancient times because of their simplicity, profound feeling and high durability. Plaster is one of the inorganic materials, and the plaster is mainly prepared on site using slaked lime, funori, square fork (seaweed), susa, etc. as raw materials. This stucco may be used as an undercoat material or as an overcoat material. When used as a topcoat material, slaked lime with sasa,
A thickener, water and the like are mixed, and if necessary, a colorant such as a pigment is mixed and used.

[0003]

However, in such a stucco, the colorant is not uniformly dispersed in the slaked lime only by mixing the slaked lime and the coloring agent, so that color unevenness occurs. Moreover, the overcoating requires the skill of a plasterer, and it is difficult to finish colored plaster evenly, so it is inevitable to use colored plaster. In addition, plaster has a high water retention property and a high viscosity, and therefore has a problem that drying is slow and color unevenness easily occurs.

The present invention has been made by focusing on the problems existing in such conventional techniques. It is an object of the present invention to provide a method for producing colored slaked lime for stucco, in which a coloring substance is uniformly dispersed and color unevenness is less generated.

[0005]

Means for Solving the Problems In order to achieve the above object, a method for producing colored slaked lime for stucco according to the first invention comprises:
The limestone is digested after adding an inorganic material as a coloring substance and firing it.

According to a second aspect, in the first aspect, the limestone is in a powder form, and the inorganic material is sludge obtained by washing the limestone with water. In the method for producing colored slaked lime for stucco of the third invention, sludge obtained by washing limestone with water is burned and then digested.

[0007]

Embodiments of the present invention will be described below in detail. Limestone used as a raw material is made of calcium carbonate (CaCO ₃ ), and has an average particle size of 0.01 to 0.1.
A powder of 5 mm is preferred, and a powder of 0.01 to 0.2 mm is more preferred. When this average particle size exceeds 0.5 mm,
The coloring substance to be added is not preferable because it is not mixed uniformly. By using such a limestone powder, the slaked lime obtained also becomes a powder having the same average particle diameter, and is suitably used for stucco.

Next, as a coloring substance, an inorganic material such as a pigment or a metal oxide is used. Further, as the color stucco containing the colored slaked lime, a brown type or a brown color type is easily used in the environment, and therefore, a red type hematite, a brown type brown millerite, a mixture of a brown type brown millerite and gehlenite are preferable. Further, it is preferable to use sludge obtained by washing limestone with water since a brownish or light brownish color tone can be obtained depending on the firing temperature. By changing the mixing ratio of this sludge to the limestone powder, it can be adjusted to any shade of brownish or light brownish. This sludge contains, for example, 80% by weight of calcium carbonate and 20% by weight of clay as a coloring substance containing iron oxide.

The amount of the coloring substance to be added is 1 to 20 in limestone.
%, Desirably in the range of 1 to 10% by weight. If the added amount of the coloring substance is less than 1% by weight, the obtained hydrated lime will have insufficient coloring properties, and if it exceeds 20% by weight, the amount of slaked lime will be relatively small and the strength of the stucco will be undesirably reduced.

The sludge obtained by washing the limestone with water is used by adding to the limestone such that the coloring substance contained therein is in the range of 1 to 20% by weight in the limestone. Since calcium is contained at a high concentration, it can be used for calcination as it is.

Then, after mixing the limestone and the powder of the coloring substance, the mixture is fired. The firing temperature is 900 to 13
A range of 00 ° C. is preferred. When the calcination temperature is lower than 900 ° C., limestone cannot be calcined into quicklime,
If the temperature exceeds 00 ° C., the coloring substance added to the limestone is undesirably melted and dissolved.

Next, water is added to the fired powder for digestion. The amount of water to be added is desirably in the range of 1.2 to 2 equivalents to the calcined powdered lime. 1.2
If the amount is less than the double equivalent, digestion of quicklime does not proceed, and if it exceeds the double equivalent, moisture remains on the surface of the obtained colored slaked lime powder, which is not preferable because it is sticky.

By this digestion, powdered colored slaked lime for stucco is obtained. The obtained slaked lime has different hues and shades depending on the type and amount of the coloring substance used and the firing temperature.

Water is added to the powdered colored slaked lime obtained in this way to obtain a viscosity suitable for coating. Then, this is applied to a wall or a roof as an undercoating material or an overcoating material to form plaster. Plaster made of this colored slaked lime has good coatability,
As well as being able to control humidity, it has antibacterial properties due to its basicity.

As described above, the embodiment has the following advantages. (1) Colored slaked lime for stucco is a method in which limestone and a coloring substance are mixed in advance and fired, so that the coloring substance is well fused to the limestone surface, and the coloring substance is uniformly mixed with the slaked lime in order to digest it. It is dispersed, and the occurrence of color unevenness can be reduced. (2) Since the sludge obtained when limestone is washed with water contains calcium carbonate in a high concentration, it can be calcined as it is and then digested to obtain colored slaked lime for plaster.
It can be brown stucco that is easy to adapt to the environment. (3) Plaster made of colored slaked lime has good applicability since slaked lime is in powder form, and can provide humidity control based on the characteristics of slaked lime and also exhibit antibacterial properties. (4) Colored slaked lime having different hues and shades can be easily obtained by adjusting the type and amount of the coloring substance and the firing temperature.

[0016]

EXAMPLES Examples and comparative examples embodying the present invention will be described below. (Example 1) Turkish blue [zirconium (Z
r), silicon (Si), and vanadium (V)].

95 parts by weight of limestone (calcium carbonate) having an average particle diameter of 0.2 mm and 5 parts by weight of a powder of Turkish blue were mixed. Then, the mixture was fired at 900 ° C. for 2 hours to obtain quicklime. To the obtained quicklime powder, 1.7 times equivalent of water with respect to quicklime was added to digest quicklime to obtain colored slaked lime. The colored slaked lime was passed through a 0.15 mm sieve to obtain colored slaked lime having a predetermined particle size.

Water was added to the colored slaked lime to make it suitable for application, and it was applied on a glass plate to a thickness of 5 mm.
When it was air-dried, the surface of the colored slaked lime layer had a pale blue color. On the surface of this colored slaked lime layer,
The reflectance was measured by irradiating light from a predetermined lamp. As a result, the reflectance was constant irrespective of the portion of the colored slaked lime layer surface, and it was confirmed that the pigment was uniformly dispersed in the slaked lime. (Example 2) As a pigment, malon pink [tin (S
n), calcium (Ca), silicon (Si), and chromium (Cr)].

95 parts by weight of limestone (calcium carbonate) having an average particle diameter of 0.2 mm and 5 parts by weight of malon pink powder were mixed. Then, the mixture is fired at 900 ° C. for 2 hours,
Quicklime was used. To the obtained quicklime powder, 1.7 times equivalent of water with respect to quicklime was added to digest quicklime to obtain colored slaked lime. This colored slaked lime is passed through a 0.15 mm sieve,
A colored slaked lime of a predetermined particle size was obtained.

Water was added to the colored slaked lime to make it suitable viscosity for application, and it was applied to a glass plate to a thickness of 5 mm.
When it was air-dried, the surface of the colored slaked lime layer had a pink color. The surface of the colored slaked lime layer was irradiated with light from a predetermined lamp to measure the reflectance. As a result, the reflectance was constant irrespective of the portion of the colored slaked lime layer surface, and it was confirmed that the pigment was uniformly dispersed in the slaked lime. Example 3 In this example, sludge obtained by washing limestone with water was used as a pigment.

This sludge is made of calcium carbonate (CaC
Since it contains 80% by weight of O ₃ ) and 20% by weight of clay as a coloring substance containing iron oxide, the sludge was directly baked at 900 ° C. for 2 hours. Then, 1.7 times equivalent of water was added to the obtained quicklime powder to digest the quicklime and obtain colored slaked lime. 0.15mm of this colored slaked lime
To obtain colored slaked lime having a predetermined particle size.

Water was added to the colored slaked lime to make it suitable viscosity for application, and it was applied to a glass plate to a thickness of 5 mm.
When it was air-dried, the surface of the colored slaked lime layer had a light brown color. The surface of the colored slaked lime layer was irradiated with light to measure the reflectance. As a result, the reflectance was constant irrespective of the portion of the colored slaked lime layer surface, and it was confirmed that the pigment was uniformly dispersed in the slaked lime. (Embodiment 4) In this embodiment, the firing temperature of the sludge is set at 10
A colored slaked lime was obtained in the same manner as in Example 3 except that the temperature was changed to 00 ° C. The colored slaked lime was passed through a 0.15 mm sieve to obtain colored slaked lime having a predetermined particle size. The reflectance was constant irrespective of the portion of the colored slaked lime layer formed on the glass plate, and it was confirmed that the pigment was uniformly dispersed in the slaked lime. (Comparative Example 1) The above-mentioned Example 1 was applied to 95 parts by weight of slaked lime.
5 parts by weight of Turkish blue of Example 2 or malon pink of Example 2. Then, water was added thereto to form a colored slaked lime layer on the glass plate. As a result, color unevenness was clearly observed with the naked eye with any of the pigments. Also, cracks were noticeable in the colored slaked lime layer.

The technical idea grasped from the embodiment will be described below. (1) The method for producing colored slaked lime for stucco according to claim 1, wherein the firing temperature is 900 to 1300 ° C. According to this production method, it is possible to obtain quicklime while preventing the coloring substance from melting and dissolving, and further to obtain slaked lime having a predetermined color tone. (2) The method according to claim 2, wherein the limestone is a powder having an average particle diameter of 0.01 to 0.5 mm. According to this method, the uniform dispersibility of the coloring substance can be improved.

[0024]

Since the present invention is configured as described above, it has the following excellent effects.

According to the method for producing colored slaked lime for stucco of the first invention, a colored substance is uniformly dispersed, and colored slaked lime for stucco with less occurrence of color unevenness can be easily obtained.
According to the second aspect, the colorant is excellent in uniform dispersibility,
It is possible to easily obtain a brown or light brown stucco that is easily compatible with the environment.

According to the method for producing colored slaked lime for stucco of the third invention, the sludge obtained when limestone containing a coloring substance is washed with water can be baked as it is, so that it is easy to adjust to the environment. Colored slaked lime can be obtained more easily.

Continuing from the front page Examiner Atsushi Shiomi (58) Field surveyed (Int. Cl. ⁷ , DB name) C04B 2/00-28/36

Claims (3)

(57) [Claims] 1. A method for producing colored slaked lime for stucco, which is digested after calcining after adding an inorganic material as a coloring substance to limestone. 2. The method for producing colored slaked lime for stucco according to claim 1, wherein the limestone is in the form of powder and the inorganic material is sludge obtained by washing the limestone with water. 3. A method for producing colored slaked lime for stucco, which is digested after baking sludge obtained by washing limestone with water.