JP4358291B1 - Tile and tile glaze - Google Patents

Abstract

An object of the present invention is to provide a roof tile that is brown and has high reflectance of infrared rays contained in solar radiation, and a glaze used for the roof tile.
A part colored by glaze is a roof tile 10 having a color coordinate a ^* of 2 or more and 6 or less, b ^* of 2 or more and 11 or less, and a lightness of 30 or more and 40 or less. , _Cr containing 2 and _{O 3} in terms of at least 1% by mass of chromium oxide, and _Mn 3 _{O 4} in terms of the following 0.875 mass% or more and 7 wt% of manganese oxide and iron oxide, _Mn 3 _{O 4} When the addition amount y mass% of iron oxide in terms of Fe ₂ O ₃ is 0.875 ≦ x <3.5 with respect to the addition amount x mass% of manganese oxide in conversion, y ≦ 2.625 -X + 1.75 ≦ y ≦ −x + 5.25, and 3.5 ≦ x ≦ 7, y ≦ 1.75 and y ≦ −x + 7.
[Selection] Figure 1

Description

  The present invention relates to a brown roof tile and a glaze used for the roof tile.

  In Japan, many buildings with tiled roofs have been built for a long time, and many such buildings are built today, mainly in houses. Buildings with tiled roofs tend to be preferred to have a calm appearance as so-called Japanese-style architecture. For this reason, the color of tiles used for the roof is mainly dark colors such as black and brown.

By the way, as one of today's problems, there is a so-called heat island phenomenon in which the temperature in urban areas is higher than the temperature in surrounding areas. One cause of the heat island phenomenon is heat storage by artificial structures such as buildings that absorb solar radiation.
As a measure to improve the heat island phenomenon, it is effective to reduce the heat storage in the building. As one of them, it is conceivable to suppress the absorption of solar radiation by improving the light reflectivity of the tile that is constantly receiving solar radiation during the day because it is used for the roof.

  However, as described above, the roof tiles are mainly dark colors such as black and brown, and in consideration of harmony with the outer wall of the building, the roof tiles are changed to a color having a high visible light reflectance such as a light color. It's also difficult.

  In addition, as what improves solar radiation reflectivity, patent document 1 has description about the solar heat reflective glaze agent etc. which are glazes excellent in the solar heat reflectivity. However, Patent Document 1 does not describe the heat-reflective ceramic particles for imparting solar heat reflectivity to the glaze agent, and cannot be implemented. Moreover, although patent document 2 has description of a white glaze containing zirconia and titania, etc., since a roof tile turns white, it cannot be used as a glaze for a dark roof tile.

JP 2006-347813 A Japanese Patent Laid-Open No. 2007-192016

  Therefore, an object of the present invention is to provide a roof tile which is brown and has high reflectance of infrared rays contained in solar radiation, and a glaze used for the roof tile.

In order to solve the above-mentioned problems, the tile of the present invention has a color coordinate a ^* of 2 or more and 6 or less, a b ^* of 2 or more and 11 or less, and a lightness of 30 or more and 40 or less. A tile,
The glaze is represented by Zegel, 0.1 to 0.4 MgO, 0.1 to 0.7 CaO, 0.2 to 0.5 BaO, 0.3 to 0.5 Al ₂ O ₃ , 1.8 to 2.6 SiO. ₂ , 0.2 to 0.5 TiO ₂ , 0.1 to 0.3 ZrO ₂ and 0.05 to 0.25 B ₂ O ₃ glaze base, and 1% by mass or more in terms of Cr ₂ O ₃ (chromium oxide) and chromium oxide, and _Mn 3 _{O 4} (trimanganese tetraoxide) of 0.875 wt% or more 7 wt% or less in terms of manganese oxide consists of iron oxide, manganese oxide in _Mn 3 _{O 4} conversion The addition amount y mass% of iron oxide in terms of Fe ₂ O ₃ (ferric oxide) with respect to the addition amount x mass% of the product,
If 0.875 ≦ x <3.5, y ≦ 2.625 and −x + 1.75 ≦ y ≦ −x + 5.25,
In the case of 3.5 ≦ x ≦ 7, y ≦ 1.75 and y ≦ −x + 7.

In order to solve the above-mentioned problems, the glaze of the present invention has a color coordinate a ^* of 2 to 6 and b ^* of 2 to 11 after glazing and baking on the tile surface. And a glaze for roof tiles having a lightness of 30 or more and 40 or less , in terms of Zegel, 0.1 to 0.4 MgO, 0.1 to 0.7 CaO, 0.2 to 0.5 BaO, 0.3 to 0 _{.5Al 2 O 3, 1.8~2.6SiO 2,} 0.2~0.5TiO 2, the glaze base is 0.1～0.3ZrO ₂ and 0.05~0.25B ₂ O _3, Cr ₂ O ₃ (chromium oxide) in terms of 1% by mass or more of chromium oxide, Mn ₃ O ₄ (trimanganese tetroxide) in terms of 0.875% by mass to 7% by mass of manganese oxide, and iron oxide consists of a, Fe ₂ for amount x mass% of manganese oxide in the _Mn 3 _{O 4} conversion The addition amount y% by mass of iron oxide in terms of O ₃ (ferric oxide)
If 0.875 ≦ x <3.5, y ≦ 2.625 and −x + 1.75 ≦ y ≦ −x + 5.25,
In the case of 3.5 ≦ x ≦ 7, y ≦ 1.75 and y ≦ −x + 7.

  The aspect of each element in the present invention is exemplified below.

1. Chromium oxide (Cr _x O _y )
The amount of chromium oxide added depends on the amount of iron oxide and manganese oxide added, but if it is in the above range, the value of the color coordinate a ^* increases (redness increases) and exhibits a brown color tone. In addition, the brightness and reflectance of solar infrared rays are improved. Preferably, it is 1 to 3% by mass in terms of Cr ₂ O ₃ .
Here, the addition amount of chromium oxide in terms of Cr ₂ O _3, the added chromium oxide and chromium component in an amount of Cr ₂ O ₃ becomes equal amounts.
As the raw material used to obtain the chromium oxide in the glaze is not particularly limited, chromium oxide _{(Cr 2 O} 3), chromite (FeCr ₂ O ₄₎ or the like can be exemplified.

2. Manganese oxide (Mn _x O _y )
Although the addition amount of manganese oxide depends on the addition amount of chromium oxide and iron oxide, if it is in the above range, it has a brownish color tone and high solar infrared reflectance (specifically 40%). Above). Preferably, it is 0.875 to 3.5% by mass in terms of Mn ₃ O ₄ .
Here, the added amount of manganese oxide in the Mn ₃ O ₄ conversion, the added manganese oxide and manganese component is an amount of Mn ₃ O ₄ to be equal amounts.
In addition, the raw material used for obtaining the manganese oxide in the glaze is not particularly limited, but trimanganese tetroxide (Mn ₃ O ₄ ), manganese dioxide (MnO ₂ ), manganese monoxide (MnO), and the like. It can be illustrated.

3. Iron oxide _{(Fe x O} y)
Although the addition amount of iron oxide depends on the addition amount of chromium oxide and manganese oxide, if it is in the above range, it has a high reflectance of solar radiation infrared (specifically, 40%) while being a brownish color tone. Above). Preferably, it is 1.75 mass% or less in terms of Fe ₂ O ₃ .
Here, the added amount of iron oxide in terms of Fe ₂ O _3, the added iron oxide and iron component is an amount of Fe ₂ O ₃ becomes equal amounts.
As the raw material used to obtain the iron oxide in the glaze is not particularly limited, ferric oxide _{(Fe 2 O} 3), ferrous oxide (FeO), chromite (FeCr ₂ O ₄₎ Etc. can be illustrated.

4). Color Coordinates When the value of the color coordinate a ^* is 2 or more and 6 or less and the value of the color coordinate b ^* is 2 or more and 11 or less, a brown tone is obtained. Preferably, the value of a ^* is 4-5 and the value of b ^* is 7-10.

5. Lightness When the lightness (L ^* ) is 30 or more and 40 or less, it becomes the brightness of a brown tile. Preferably, it is 35-39.

6). Firing The firing conditions for forming the glaze film on the tile surface are different depending on the glaze base and are not particularly limited, but the maximum temperature is preferably 1,000 to 1,300 ° C., and the firing time is 7 to 20 hours.

7). The glazing method for applying glaze to the tile surface is not particularly limited, and examples thereof include pouring, spraying, and spraying.
Further, the amount of glaze applied to the surface of the roof tile varies depending on the shape of the roof tile and is not particularly limited, but it is preferably a J-shaped roof tile of 60 to 100 g.

8). The roof tile is not particularly limited, and examples thereof include a main-fired shape, a J shape, an F shape, an S shape, and a Spanish shape. In addition, when it hits the roof, all the parts that appear as the surface of the roof (parts under the other tiles and other parts that are hidden) are colored as a whole roof during solar radiation. It is preferable because absorption of infrared rays contained therein can be reduced.

  ADVANTAGE OF THE INVENTION According to this invention, although it is a brown type | system | group, the roof tile with high reflectivity of the infrared rays contained in solar radiation and the glaze used for this roof tile can be provided.

It is a perspective view of the roof tile of the Example of this invention. It is a graph of the relationship between the addition amount and the addition amount of _Fe 2 _{O 3} of Mn ₃ O _4.

  The glaze for tiles of the present invention contains chromium oxide, manganese oxide, and iron oxide as colorants, and is applied in a film form on the surface of the tile 10 as shown in FIG.

Therefore, Cr ₂ O ₃ , Mn ₃ O ₄ and Fe ₂ O ₃ are used as the colorant chromium oxide, manganese oxide and iron oxide, and the amount of Cr ₂ O ₃ added is 1.5 mass%. , Mn ₃ O ₄ and Fe ₂ O ₃ were added in 20 examples and 25 comparative examples, respectively. Color coordinates (a ^* , b ^* ), brightness (L ^* ) ) And the reflectance of infrared rays contained in solar radiation are measured, and the results are shown in Table 1. The amount of each colorant (Cr ₂ O ₃ , Mn ₃ O ₄ , Fe ₂ O ₃ ) in Table 1 is a ratio to the entire glaze (a combination of the colorant and the glaze base described later). Also, Figure 2 shows the graph of the relationship between the mixing amount of _Mn 3 _O amount and _Fe 2 _{O 3} of _4.

但し、塩基性酸化物（ＭｇＯ、ＣａＯ、ＢａＯ）の合計を１モルとする。 Each sample was prepared by adding a colorant to the glaze base of the following Seegel formula blending ratio (molar ratio) to make the whole (total amount of glaze base and colorant) 100% by mass, It was prepared by wet pulverization using a ball mill.

However, the total amount of basic oxides (MgO, CaO, BaO) is 1 mol.

  The sample prepared as described above was glazed on the surface of the tile base, and then fired for 10 hours under conditions where the maximum temperature was about 1,100 ° C. to form a glaze film on the surface of the tile.

  Measurements of Examples and Comparative Examples of the present invention were performed as follows.

(1) Color The color of each sample (tile surface) was measured for color coordinates a ^* , b ^* and lightness (L ^* ) using a color difference meter (“CR-400” manufactured by Konica Minolta). Further, the saturation (C ^* ) was calculated from the values of the color coordinates a ^* and b ^* using the following formula.

(2) Solar infrared reflectance The infrared reflectance of each sample was measured using a spectrophotometer ("U-4000" manufactured by Hitachi High-Technologies Corporation) in an area of 835 to 2500 nm at 5 nm intervals.
Then, in order to obtain the solar infrared reflectance that is the reflectance of the infrared rays contained in the solar radiation, the value measured for each wavelength is used to calculate the solar reflectance specified in JIS A5759 by the weight value coefficient for calculating the solar reflectance. did.

Next, two examples and three types in which the addition amount of Mn ₃ O ₄ was 3.5 mass%, the addition amount of Fe ₂ O ₃ was 3.2 mass%, and the addition amount of Cr ₂ O ₃ was changed. In the same manner as described above, the color coordinates (a ^* , b ^* ), the lightness (L ^* ) and the reflectance of infrared rays contained in the solar radiation were measured as described above. The results are shown in Table 2. The amount of each colorant (Cr ₂ O ₃ , Mn ₃ O ₄ , Fe ₂ O ₃ ) in Table 2 is a ratio to the entire glaze (a combination of the colorant and the glaze base).

From the above results, all the examples (Cr ₂ O ₃ : 1.5 to ₃ % by mass, Mn ₃ O ₄ : 0.875 to 7% by mass, Fe ₂ O ₃ : 2.625% by mass or less, Those having a predetermined relationship between the addition amount of Mn ₃ O _{4 and} the addition amount of Fe ₂ O ₃ are brown (color coordinates a ^* 2 to 6, b ^* 2 to 11, brightness 30 to 40) However, the reflectance of solar infrared radiation was 40% or more, and the reflectance of solar infrared radiation was improved by 31% or more from the conventional brown type (reflectance of solar infrared radiation: 30.5%).

  In addition, this invention is not limited to the said Example, In the range which does not deviate from the meaning of invention, it can change suitably and can be actualized.

  10 roof tiles

Claims (2)

The part colored by the glaze is a roof tile having a color coordinate a ^* of 2 or more and 6 or less, b ^* of 2 or more and 11 or less, and a lightness of 30 or more and 40 or less.
The glaze is
0.1 to 0.4 MgO, 0.1 to 0.7 CaO, 0.2 to 0.5 BaO, 0.3 to 0.5 Al ₂ O ₃ , 1.8 to 2.6 SiO ₂ . A glaze base that is 2-0.5 TiO ₂ , 0.1-0.3 ZrO ₂ and 0.05-0.25 B ₂ O ₃ ;
1% by mass or more of chromium oxide in terms of Cr ₂ O ₃ ,
0.875 mass% or more and 7 mass% or less manganese oxide in terms of Mn ₃ O ₄ ,
It consists of the iron oxide,
The addition amount y mass% of iron oxide in terms of Fe ₂ O _{3 with} respect to the addition amount x mass% of manganese oxide in terms of Mn ₃ O ₄ ,
If 0.875 ≦ x <3.5,
y ≦ 2.625 and −x + 1.75 ≦ y ≦ −x + 5.25,
If 3.5 ≦ x ≦ 7,
A roof tile characterized by y ≦ 1.75 and y ≦ −x + 7. The chromaticity after glazing and firing on the tile surface is a glaze for tiles with color coordinates a ^* of 2 or more and 6 or less, b ^* of 2 or more and 11 or less, and lightness of 30 or more and 40 or less. And
0.1 to 0.4 MgO, 0.1 to 0.7 CaO, 0.2 to 0.5 BaO, 0.3 to 0.5 Al ₂ O ₃ , 1.8 to 2.6 SiO ₂ . A glaze base that is 2-0.5 TiO ₂ , 0.1-0.3 ZrO ₂ and 0.05-0.25 B ₂ O ₃ ;
1% by mass or more of chromium oxide in terms of Cr ₂ O ₃ ,
0.875 mass% or more and 7 mass% or less manganese oxide in terms of Mn ₃ O ₄ ,
It consists of the iron oxide,
The addition amount y mass% of iron oxide in terms of Fe ₂ O _{3 with} respect to the addition amount x mass% of manganese oxide in terms of Mn ₃ O ₄ ,
If 0.875 ≦ x <3.5,
y ≦ 2.625 and −x + 1.75 ≦ y ≦ −x + 5.25,
If 3.5 ≦ x ≦ 7,
A glaze for roof tiles, wherein y ≦ 1.75 and y ≦ −x + 7.

Images