Over-glaze decoration material, ceramic ware product and method for manufacturing ceramic ware product
阅读说明：本技术 釉上彩装饰材料、陶瓷器产品、陶瓷器产品的制造方法 (Over-glaze decoration material, ceramic ware product and method for manufacturing ceramic ware product ) 是由 白石敦则 于 2018-10-25 设计创作，主要内容包括：本发明的课题在于,提供光亮颜料不熔化、能够维持光亮特性、具有金属色调的质感、且使具有表面光泽性的光亮釉上彩实施于陶瓷器产品的釉上彩装饰材料。本发明的解决手段是,本发明所涉及的釉上彩装饰材料的特征在于,包含：熔块,其作为熔块本身的组成包含40质量%以上且60质量%以下的二氧化硅、15质量%以上且35质量%以下的氧化硼、和18质量%以下的选自氧化锂、氧化钠和氧化钾中的1种以上的碱金属氧化物；以及,能够产生金属感的光亮颜料。(The invention provides an over-glaze decoration material which can maintain the brightness characteristic without melting the bright pigment, has the texture of metal tone and can make the bright over-glaze decoration with surface gloss applied on the ceramic ware product. The solution of the present invention is that the overglaze decoration material according to the present invention includes: a frit which comprises, as a composition of the frit itself, 40 mass% or more and 60 mass% or less of silica, 15 mass% or more and 35 mass% or less of boron oxide, and 18 mass% or less of 1 or more alkali metal oxides selected from the group consisting of lithium oxide, sodium oxide, and potassium oxide; and a bright pigment capable of giving a metallic feeling.)
1. The over-glaze decoration material is characterized by comprising:
a frit which comprises, as a composition of the frit itself, 40 mass% or more and 60 mass% or less of silica, 15 mass% or more and 35 mass% or less of boron oxide, and 18 mass% or less of 1 or more alkali metal oxides selected from the group consisting of lithium oxide, sodium oxide, and potassium oxide; and
a bright pigment capable of giving a metallic feeling.
2. The material for over-glaze decoration according to claim 1, wherein the bright pigment is contained in an amount of 0.1 to 9 mass%, and the remainder is the frit.
3. The material for over-glaze decoration according to claim 1, wherein the material contains the bright pigment and the non-bright pigment in an amount of 0.1 to 9 mass%, and the remainder is the frit.
4. The over-glaze decoration material according to claim 1, wherein the bright pigment is contained in an amount of 0.1 to 9 mass%, and the color-developing metal compound, and the remainder is the frit.
5. The over-glaze decoration material according to any one of claims 1 to 4, wherein in the bright pigment, plate-like particles and/or plate-like particles covered with 1 or more oxides selected from titanium oxide, iron oxide, silicon oxide, tin oxide, and zirconium oxide are contained.
6. An enamel decorative material as set forth in claim 5, wherein the plate-like particles are 1 or more selected from mica, silica, alumina, borosilicate glass.
7. A ceramic ware product characterized by having a glass layer containing 0.1 to 9 mass% of a bright pigment capable of giving a metallic feeling.
8. The chinaware product according to claim 7, wherein the glass layer contains 40 mass% or more and 60 mass% or less of silica, 15 mass% or more and 35 mass% or less of boron oxide, and 18 mass% or less of 1 or more alkali metal oxides selected from lithium oxide, sodium oxide, and potassium oxide.
9. A chinaware product according to claim 7 or 8, wherein pigments other than bright pigments are included in the glass layer.
10. A chinaware product according to claim 7 or 8, characterized in that the glass layer comprises a colour-developing metal compound.
11. The chinaware product according to any one of claims 7 to 10, wherein in the bright pigment, plate-like particles and/or plate-like particles covered with 1 or more oxides selected from titanium oxide, iron oxide, silicon oxide, tin oxide, and zirconium oxide are contained.
12. A ceramic ware product according to claim 11, wherein said plate-like particles are 1 or more selected from mica, silica, alumina and borosilicate glass.
13. The chinaware product according to any one of claims 7 to 12, wherein the specular gloss (Gs60 °) of the surface of the glass layer has a value of 60 or more, and the value of the apparent reflectance Y at an acceptance angle of 30 ° is increased in a variation angle photometric distribution measurement at an incident light angle of-45 ° compared with the value of the apparent reflectance Y at an acceptance angle of 0 °.
14. A method for manufacturing a ceramic ware product, comprising:
a step of preparing an over-glaze decoration material, the over-glaze decoration material comprising: a frit which comprises, as a composition of the frit itself, 40 mass% or more and 60 mass% or less of silica, 15 mass% or more and 35 mass% or less of boron oxide, and 18 mass% or less of 1 or more alkali metal oxides selected from the group consisting of lithium oxide, sodium oxide, and potassium oxide; and, a bright pigment capable of giving a metallic feeling;
a step of preparing a paste containing the aforementioned over-glaze decoration material;
a step of coating the paste on a base material; and
and calcining the base material.
15. A method for manufacturing a ceramic ware product, comprising:
a step of preparing an over-glaze decoration material, the over-glaze decoration material comprising: a frit which comprises, as a composition of the frit itself, 40 mass% or more and 60 mass% or less of silica, 15 mass% or more and 35 mass% or less of boron oxide, and 18 mass% or less of 1 or more alkali metal oxides selected from the group consisting of lithium oxide, sodium oxide, and potassium oxide; a bright pigment capable of giving a metallic feeling; and, pigments other than bright pigments;
a step of preparing a paste containing the aforementioned over-glaze decoration material;
a step of coating the paste on a base material; and
and calcining the base material.
16. A method for manufacturing a ceramic ware product, comprising:
a step of preparing an over-glaze decoration material, the over-glaze decoration material comprising: a frit which comprises, as a composition of the frit itself, 40 mass% or more and 60 mass% or less of silica, 15 mass% or more and 35 mass% or less of boron oxide, and 18 mass% or less of 1 or more alkali metal oxides selected from the group consisting of lithium oxide, sodium oxide, and potassium oxide; a bright pigment capable of giving a metallic feeling; and, a metal compound exhibiting color-rendering properties;
a step of preparing a paste containing the aforementioned over-glaze decoration material;
a step of coating the paste on a base material; and
and calcining the base material.
Technical Field
The present invention relates to an over-glaze decoration material (over-glaze decoration material) capable of forming a glass layer (over-glaze decoration layer) having a metallic tone of brightness and luster, and a ceramic ware product using the over-glaze decoration material (over-glaze decoration material), and a method for manufacturing the same.
Background
In recent years, as coatings for products such as automobiles, smart phones, and home appliances, metallic tone coatings have been increasing. In the metallic tone coating of each product as described above, a bright pigment capable of giving a metallic feeling is added to a basic resin component of the coating material. In such a bright pigment, a substance having a high refractive index is used by coating fine flaky fine particles (plate-like particles) with titanium oxide, iron oxide, or the like, and the particles randomly fixed in the coating film reflect incident light in various directions, thereby giving a metallic feeling.
Attempts have also been made to introduce the aforementioned metallic feeling into ceramic ware products. For example, patent document 1 (jp 2005-320183 a) discloses a ceramic ware in which a light scattering filler for generating a pearl-like texture by light scattering is mixed into a thick coating layer containing a light-transmissive glass material.
Patent document 1: japanese patent laid-open No. 2005-320183.
Disclosure of Invention
Problems to be solved by the invention
In the production of a ceramic ware product of metallic tone, a base material is coated with a coating material to which a bright pigment capable of giving a metallic feeling is added as an over-glaze color, and the over-glaze color is calcined. However, the bright pigments as described above are easily melted in high-temperature glass, and the metallic feeling disappears during firing.
Therefore, there is a problem that even if an attempt is made to produce a metallic glaze using a common frit (glass) for ceramics, the bright pigment is melted in the frit and the metallic glaze is not formed.
On the other hand, conventionally, as ceramic ware products using bright pigments, products obtained by coloring with mica gold glaze or mica silver glaze have been used. The amount of the bright pigment added to the frit is set to about 10 to 20 mass% and the bright pigment is made difficult to melt in the glass by reducing the proportion of the glass in the enamel.
However, mica gold overglaze and mica silver overglaze have problems that, since a bright pigment is used in the same manner as in the case of metallic tone coating, the amount of glass covering the overglaze surface to produce gloss is small although the overglaze has a certain level of metallic tone gloss, and further, mica crystals are present in a large amount on the overglaze surface to reduce the surface gloss and form a matte appearance.
Further, in the mica gold enamel and the mica silver enamel, since the glass component covering the surface of the enamel is small, there is a problem that stains are easily attached to the surface and it is difficult to remove the attached stains.
Means for solving the problems
The present invention solves the above-mentioned problems, and an over-glaze decoration material according to the present invention may include, for example: a frit which comprises, as a composition of the frit itself, 40 mass% or more and 60 mass% or less of silica, 15 mass% or more and 35 mass% or less of boron oxide, and 18 mass% or less of 1 or more alkali metal oxides selected from the group consisting of lithium oxide, sodium oxide, and potassium oxide; and a bright pigment capable of giving a metallic feeling.
The over-glaze decoration material according to the present invention may contain the bright pigment in an amount of 0.1 mass% to 9 mass%, with the remainder being the frit, for example.
The enamel decorating material according to the present invention may contain, for example, the bright pigment and the pigment other than the bright pigment in an amount of 0.1 to 9 mass%, with the remainder being the frit.
The over-glaze decoration material according to the present invention may contain, for example, 0.1 mass% to 9 mass% of the bright pigment and the color-developing metal compound, and the remainder may be the frit.
The enamel decorating material according to the present invention may contain plate-like particles and/or plate-like particles covered with 1 or more oxides selected from titanium oxide, iron oxide, silicon oxide, tin oxide, and zirconium oxide, for example, in the bright pigment.
The enamel decorating material according to the present invention may be, for example, at least 1 kind selected from mica, silica, alumina and borosilicate glass.
The ceramic ware product according to the present invention may have, for example, a glass layer containing 0.1 mass% to 9 mass% of a bright pigment capable of giving a metallic feeling.
The ceramic ware product according to the present invention may include, for example, 40 mass% to 60 mass% of silica, 15 mass% to 35 mass% of boron oxide, and 18 mass% or less of 1 or more alkali metal oxides selected from lithium oxide, sodium oxide, and potassium oxide in the glass layer.
In addition, the ceramic ware product according to the present invention may contain a pigment other than a bright pigment, for example, in the glass layer.
The ceramic ware product according to the present invention may contain a color-developing metal compound in the glass layer, for example.
The ceramic ware product according to the present invention may contain plate-like particles and/or plate-like particles covered with 1 or more oxides selected from titanium oxide, iron oxide, silicon oxide, tin oxide, and zirconium oxide, for example, in the bright pigment.
The ceramic ware product according to the present invention may have, for example, 1 or more kinds of plate-like particles selected from mica, silica, alumina, and borosilicate glass.
Further, the ceramic ware product according to the present invention is characterized in that the value of the specular surface gloss (Gs60 °) of the glass layer is 60 or more, and the value of the apparent reflectance Y at the acceptance angle of 30 ° is increased in the measurement of the variation angle luminosity distribution at the acceptance angle of-45 ° compared with the value of the apparent reflectance Y at the acceptance angle of 0 °.
The method for manufacturing a ceramic ware product according to the present invention may further include: a step of preparing an over-glaze decoration material, the over-glaze decoration material comprising: a frit which comprises, as a composition of the frit itself, 40 mass% or more and 60 mass% or less of silica, 15 mass% or more and 35 mass% or less of boron oxide, and 18 mass% or less of 1 or more alkali metal oxides selected from the group consisting of lithium oxide, sodium oxide, and potassium oxide; and, a bright pigment capable of giving a metallic feeling; a step of preparing a paste containing the aforementioned over-glaze decoration material; a step of coating the paste on a base material; and a step of calcining the base material.
The method for manufacturing a ceramic ware product according to the present invention may further include: a step of preparing an over-glaze decoration material, the over-glaze decoration material comprising: a frit which comprises, as a composition of the frit itself, 40 mass% or more and 60 mass% or less of silica, 15 mass% or more and 35 mass% or less of boron oxide, and 18 mass% or less of 1 or more alkali metal oxides selected from the group consisting of lithium oxide, sodium oxide, and potassium oxide; a bright pigment capable of giving a metallic feeling; and, pigments other than bright pigments; a step of preparing a paste containing the aforementioned over-glaze decoration material; a step of coating the paste on a base material; and a step of calcining the base material.
The method for manufacturing a ceramic ware product according to the present invention may further include: a step of preparing an over-glaze decoration material, the over-glaze decoration material comprising: a frit which comprises, as a composition of the frit itself, 40 mass% or more and 60 mass% or less of silica, 15 mass% or more and 35 mass% or less of boron oxide, and 18 mass% or less of 1 or more alkali metal oxides selected from the group consisting of lithium oxide, sodium oxide, and potassium oxide; a bright pigment capable of giving a metallic feeling; and, a metal compound exhibiting color-rendering properties; a step of preparing a paste containing the aforementioned over-glaze decoration material; a step of coating the paste on a base material; and a step of calcining the base material.
ADVANTAGEOUS EFFECTS OF INVENTION
According to the over-glaze decoration material of the present invention, it is possible to provide a ceramic ware product subjected to bright over-glaze decoration which has metallic texture and surface glossiness, and which can maintain the bright characteristics without melting a bright pigment in high-temperature glass even at an over-glaze firing temperature (around 800 ℃) of the ceramic ware product.
Further, the enamel decorating material according to the present invention can provide a ceramic ware product having a metallic lustrous feeling, which maintains a high surface lustrous feeling and is less likely to have stains on the surface, and which can be used as a tableware.
The ceramic ware product according to the present invention has a texture of "metallic" color tone and is colored with a bright glaze having surface glossiness.
In addition, the method for manufacturing a ceramic ware product according to the present invention can manufacture a ceramic ware product having a texture of "metallic" color tone and having a bright overglaze color with surface glossiness.
Drawings
Fig. 1 is a diagram illustrating the principle that a bright pigment can give a metallic feeling.
Fig. 2 is a diagram illustrating an outline of a measurement system of a variable angle photometric distribution.
Fig. 3 is a graph showing the measurement results of the angle-changing photometric distribution.
Fig. 4 is a partially enlarged view of fig. 3.
Fig. 5 is a graph showing the results (1) of measurement of the variation angle photometric distribution of examples 1 to 10 of the present invention.
Fig. 6 is a graph showing the results (2) of measurement of the varied angle photometric distribution of examples 11 to 20 of the present invention.
Fig. 7 is a graph showing the results of measurement of the variation angle photometric distribution of comparative examples 1 to 4.
Detailed Description
The present invention will be specifically described below.
The inventors have found that a bright pigment giving a metallic feeling is easily melted in a high-temperature glass, and the bright characteristic of giving a metallic texture is easily lost at an over-glaze firing temperature (around 800 ℃) of a ceramic ware product. Therefore, it is considered to prepare a frit having a reduced ignition strength as described above by reducing the ignition strength (ability to melt a pigment) of glass in addition to constituting the over-glaze decoration material (over-glaze decoration material) according to the present invention.
As a frit used for an over-glaze decoration material (over-glaze material) according to the present invention, it has been studied to reduce the glass flammability (ability to melt a pigment) by subtracting the ratio of an alkali metal to an alkaline earth metal from a general composition of an over-glaze frit (glass) for decoration such as a commercially available product. Further, the specific blending ratio of the alkali metal and the alkaline earth metal is also studied intensively, excluding the alkali metal and the alkaline earth metal.
In general, commercial frits are directed toward a technique for improving combustibility, and therefore, in regard to alkali metals, light elements such as Li and Na are increased and K, which is a heavy element, is decreased, whereas in regard to alkaline earth metals, light elements such as Ca are decreased and heavy elements such as Ba are increased. Therefore, the frit used in the present invention is directed in the opposite direction to the above-described technique.
The glaze color decorative material related by the invention reduces light elements such as Li, Na and the like and increases heavy elements such as K and the like with respect to alkali metals. The alkali metal oxide is contained for the purpose of lowering the melting point, in particular, Li2O (lithium oxide) and Na2Since an alkali metal oxide such as O (sodium oxide) dissolves a bright pigment with high efficiency, a frit composition in consideration of this point is required. More particularly for Li2O and Na2The 1 or more alkali metal oxides in O may be contained in the frit so as to be 4 mass% or less. The content of the alkali metal oxide is preferably 3.5% by mass or less, more preferably 3.1% by mass or less, and further includes 0% by mass.
On the other hand, the alkali metal oxide contributes to lowering of melting point, chemical stability and durability, and is therefore directed to K2O (potassium oxide),the frit may be contained in an amount of 3 mass% or more. For K2The content of O may be contained so as to be preferably 5% by mass or more, more preferably 6.7% by mass or more.
Oxides of alkaline earth metals are added to the frit for vitrification. In the enamel decorating material according to the present invention, basically, the composition of the frit used as the enamel decorating material is more suitable by adjusting the frit with a tendency to increase the light element such as Ca and decrease the heavy element such as Ba, but the optimum amount of CaO varies depending on the ratio of the oxide of the alkali metal, the oxide of the alkali earth metal, and the zinc oxide.
The content of CaO (calcium oxide) may be contained in the frit so as to be preferably 0.5 mass% or more, and more preferably 1 mass% or more. However, the content of CaO may be 0% by mass or more. In this embodiment, CaO is also counted as a substance not intentionally included as a composition of the frit.
Further, BaO (barium oxide) may be contained in the frit so as to be 9 mass% or less. The content of BaO is preferably 7% by mass or less, more preferably 5% by mass or less, and further includes 0% by mass.
Basically, in the enamel decorating material according to the present invention, it is desired to increase light elements such as Ca and heavy elements such as Ba with respect to the alkaline earth metal, but Li is selected as the element2O and Na2When the content of 1 or more alkali metal oxides in O is close to 4 mass% which is an upper limit value, the content of both CaO and BaO may be 0 mass%.
When the frit composition of BaO is 0 mass%, SrO (strontium oxide) may be contained instead.
The main component of the overglaze decoration material, namely SiO2The (silica) may be contained in an amount of 40 to 60 mass%. SiO 22The content of (b) may be contained so as to be preferably 42% by mass or more and 57% by mass or less, and more preferably 43.7% by mass or more and 54.1% by mass or less. If it is less than 40% by mass, the alloy is meltedThe proportion of alkali metal and alkaline earth metal in the block composition increases, the combustion power becomes large, the possibility of melting the bright pigment increases, and if it exceeds 60 mass%, the melting point of the frit increases, and the melting of the overglaze color at 800 ℃ as the calcination temperature becomes insufficient, impairing the gloss of the overglaze.
B2O3(boron oxide) is contained in the frit in order to lower the melting temperature of the frit. B is2O3The content of the glass frit composition may be 15 mass% or more and 35 mass% or less. B is2O3The content of (b) may be contained so as to be preferably 18% by mass or more and 33% by mass or less, and more preferably 21.7% by mass or more and 29% by mass or less. If the amount is less than 15% by mass, the melting point of the frit increases, and the melting of the enamel at 800 ℃ as the calcination temperature becomes insufficient, whereby the gloss of the enamel deteriorates, and if the amount is more than 35% by mass, the burning force becomes large, and the possibility of melting the bright pigment increases.
Al2O3(alumina) for modification of SiO in frit formation2The glass has an acid resistance improved by an appropriate content of the skeleton of (2). Al (Al)2O3The content of (3) can make a frit even at 0 mass%, but Al2O3May be contained so as to be 8 mass% or less based on the frit composition. Al (Al)2O3The content of (b) may be contained so as to be preferably 8% by mass or less, more preferably 0.2% by mass or more and 6.3% by mass or less. If it exceeds 10 mass%, the melting temperature becomes high, further resulting in devitrification of the frit.
ZnO (zinc oxide) is added in the form of an oxide, and may be contained in an amount of 10 mass% or less in the frit composition in order to impart a lowering in melting point and chemical stability. The content of ZnO may be contained so as to be preferably 2 mass% or more and 6 mass% or less, and more preferably 3.0 mass% or more and 4.3 mass% or less. If it exceeds 10 mass%, the problem of deterioration of chemical durability arises.
ZrO2The (zirconia) is contained in the frit for the purpose of imparting durability to an acid and chemical stability. ZrO (ZrO)2May be made of a fritThe composition is contained so as to be 10% by mass or less. ZrO (ZrO)2The content of (b) may be contained so as to be preferably 2% by mass or more and 8% by mass or less, and more preferably 4.9% by mass or more and 5.3% by mass or less. If it exceeds 10 mass%, the melting temperature becomes high, further resulting in devitrification of the frit.
The glazing material of the present invention has a frit composition as described above, and thus the glass has a reduced flammability (ability to melt a pigment) without deviating from the melting point and thermal expansion coefficient of the conventional frit for glazing.
In the frit composition as described above, the composition forming the basic skeleton is SiO2、B2O3And the composition of the alkali metal oxide, and the composition of the other components can be appropriately adjusted. Therefore, the composition of the frit is defined by silica, boron oxide, and alkali metal oxides (lithium oxide, sodium oxide, potassium oxide) in the claims of the present invention.
The frit composition used in the present invention may contain 1 or more alkali metal oxides selected from lithium oxide, sodium oxide, and potassium oxide in an amount of 18 mass% or less. The content of the alkali metal oxide may be preferably 15% by mass or less, and more preferably 13.7% by mass or less.
In the present specification, CaO, BaO, SrO, and Al in the frit are referred to2O3、ZrO2The various components of (a) are described, but to be described as merely one estimate. In addition, although the numerical ranges of the compositions in the claims are not specified, the alkaline earth metal is also important as the framework of the glass.
The frit having the above-described composition contains a bright pigment capable of giving a metallic feeling in the enamel decorative material according to the present invention in an amount of 0.1 to 9 mass%. The content of the bright pigment may be contained so as to be preferably 0.2% by mass or more and 8% by mass or less, and more preferably 0.3% by mass or more and 8% by mass or less. If the amount of the bright pigment added is less than 0.1%, the bright characteristics cannot be obtained. Further, if the amount of the brightening pigment added is increased to more than 9 mass%, the amount of glass covering the glazed surface to produce a gloss is small, and further, the brightening pigment is present in a large amount in the glazed surface, so that the surface gloss feeling is small, and a matte state is formed.
Among the bright pigments used in the over-glaze decoration material according to the present invention, the individual bodies themselves containing plate-like particles (flaky fine particles) are preferable; plate-like particles (flake-like fine particles) covered with 1 or more oxides selected from titanium oxide, iron oxide, silicon oxide, tin oxide, and zirconium oxide, and the like. In this case, the bright pigment may contain both the uncoated plate-like particles (flaky particles) and the oxide-coated plate-like particles (flaky particles), or may contain either the uncoated plate-like particles (flaky particles) or the oxide-coated plate-like particles (flaky particles). The plate-like particles are preferably any one or more of mica, silica, alumina, and borosilicate glass.
Using the frit having the above composition, adding 0.3 to 8 wt% of a bright pigment to produce an overglaze decoration material (bright overglaze decoration material), coating the overglaze decoration material on the surface of a ceramic ware, drying the overglaze decoration material, and calcining the overglaze decoration material at 750 to 830 ℃ to produce overglaze decoration (the thickness of the overglaze decoration layer (glass layer) after calcination is about 0.05 to 0.2 mm). The overglaze color is characterized in that the bright pigment is not melted in the glass, can maintain the bright characteristic, has the texture of metallic color tone, and has high surface glossiness.
If the thickness of the fired enamel layer (glass layer) is less than 0.05mm, sufficient metallic-tone glitter characteristics cannot be obtained. Further, even when the thickness is larger than 0.2mm, the metallic tone gloss characteristics of the enamel layer (glass layer) are not improved, and further, the formed metallic tone enamel layer (glass layer) has problems of peeling and cracking. The average particle size of the frit having the above composition is preferably 5 to 20 μm in consideration of workability of coating with a pen. For the measurement of the particle size distribution (particle size distribution) of the frit, セイシン LMS-2000e, manufactured by セイシン, a laser diffraction/scattering particle size distribution measuring device, was used. In the measurement of the particle size distribution (particle size distribution) of the frit, the refractive index of the particles was set to 1.52, and the particle absorptance was set to 0. In the present specification, d50 obtained by the above-described measurement is used as an index indicating the particle size distribution (particle size distribution) of the frit.
The ceramic ware product of the present invention having the overglaze color formed of the overglaze decoration material of the present invention has a texture which is not possessed by the conventional overglaze decoration of the surface glossiness and the brightness, and has a texture of metal coating. The surface gloss is evaluated by the specular gloss (Gs60 °) of the surface, and the specular gloss (Gs60 °) of the surface of the ceramic ware product according to the present invention is 60 or more.
In the measurement of the variation angle luminosity distribution at an incident light angle of-45 degrees, the value of the apparent reflectance Y at a light receiving angle of 0 ° was compared with the value of the apparent reflectance Y at a light receiving angle of 30 ° for the brightness characteristics of ceramic ware products, and the evaluation was performed. Specifically, in the ceramics product according to the present invention, in the measurement of the varied angle luminosity distribution at an incident light angle of-45 degrees, the value of the apparent reflectance Y at a light receiving angle of 30 ° is increased as compared with the value of the apparent reflectance Y at a light receiving angle of 0 °.
The firing temperature in the production step of the ceramic ware product according to the present invention may be about 750 to 830 ℃ which is the same as that of the conventional over-glaze decoration.
In addition, in the ceramic ware product according to the present invention, the change in the glittering feeling can be given by the particle diameter of the glittering pigment. In addition, the ceramic ware product according to the present invention can be manufactured by adding a pigment (pigment other than bright pigment) and a coloring metal compound in addition to the bright pigment, thereby manufacturing a colored overglaze ceramic ware product having a wide variety of metallic hues.
Here, the color-developing metal compound (mainly, metal oxide) refers to a substance that colors a glass layer (enamel layer) by the color of the oxidized metal itself; examples of the material ionized by firing to color the glass layer (enamel layer) include iron oxide, chromium oxide, cobalt oxide, copper oxide, manganese dioxide, and copper carbonate.
In addition, even when the ceramic ware product glazed with the glazed decorative material according to the present invention is immersed in a 4% acetic acid aqueous solution for 1 day (24 hours) as an acid resistance test, the ceramic ware product does not generate haze or the like in appearance, and does not change the surface gloss.
The enamel decorating material according to the present invention can further improve acid resistance by adding a rare earth metal oxide such as lanthanum oxide in an amount of 3 mass% or less.
Further, the over-glaze decoration material according to the present invention can be confirmed to be a transfer paper.
Further, according to the over-glaze decoration material of the present invention, by using a bright pigment having a gold color including plate-like particles (flaky fine particles) surface-coated with iron oxide, it is possible to manufacture an over-glaze ceramic product having a gold coloration with surface gloss. Compared with the existing ceramic product which is glazed and colored by mica gold, the ceramic product has strong surface gloss, thereby being close to the texture of gold glazing. Further, in the case of comparing it with a ceramic ware product having gold overglaze, it can be produced at low cost. Further, in the ceramic ware product according to the present invention, there is no energization, so that the use of a microwave oven is possible. Further, the gold overglaze is softer than glass and gold is liable to fall off by washing or the like, but the pottery product according to the present invention is more firmly fixed than the gold overglaze because of a large amount of glass, and washing durability is improved.
The overglaze decoration material (bright overglaze decoration material) according to the present invention can be used for decorating ceramics, glass products, and enamel products.
According to the above-described over-glaze decoration material of the present invention, it is possible to provide a ceramic ware product having a bright over-glaze color which has metallic texture and surface glossiness, without melting a bright pigment in a high-temperature glass even at an over-glaze firing temperature (around 800 ℃) of the ceramic ware product, and which can maintain the bright characteristics.
Further, the enamel decorating material according to the present invention can provide a ceramic ware product having a metallic lustrous feeling, which maintains a high surface lustrous feeling and is less likely to have stains on the surface, and which can be used as a tableware.
The ceramic ware product according to the present invention has a texture of "metallic" color tone and is colored with a bright glaze having surface glossiness.
In addition, the method for manufacturing a ceramic ware product according to the present invention can manufacture a ceramic ware product having a texture of "metallic" color tone and having a bright overglaze color with surface glossiness.
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