JP2002080266A - Sanitary ware - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sanitary ware which keeps necessary mechanical strength, less prone to generate forming failure or deformation after firing, less prone to generate defects at the drying than ever, is able to reduce drying load and improve productivity, and copes with resources saving and lightening the same. SOLUTION: The sanitary ware is characterized in that it is made from ceramics basis and glazed layer formed on needed part of the basis, and using fiber wollustonite, the aspect ratio of which is >=10 as basis raw material.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to sanitary ware such as a hand basin, a basin, a urinal, a toilet bowl, a toilet tank, and a toilet sana.

[0002]

2. Description of the Related Art Sanitary ware, such as a hand basin, a basin, a urinal, a toilet bowl, a toilet tank, and a toilet sana, is a daily necessity. Strength is required. In addition, design properties are also required. In addition, the above products are required to have chemical stability in order to be used around water. Therefore, since ancient times, sanitary ware can be baked at a temperature of 1100 to 1300 ° C, where it is easy to secure the degree of freedom of design based on the color and pattern of the glaze layer in a single firing, especially for glazed ceramics However, glazed hard pottery bases and fusible bases that can exhibit sufficient mechanical strength have been generally used.

[0003]

However, in the case of a hard porcelain base material or a fusible base material, the amount of shrinkage during firing and the amount of deformation were large in order to harden until a sufficient mechanical strength was exhibited. For this reason, it is difficult to accurately design the shape and dimensions of the product after firing, and the degree of freedom in providing designability and functionality based on the shape has been limited.
Further, depending on the shape of the product, the above-described shrinkage or deformation may cause cracks, variations in shape, or deterioration in step precision, which may cause a reduction in yield. Furthermore, since the volume of the molded body is large, the efficiency of filling in the kiln deteriorates accordingly, and it is difficult to say that the productivity is sufficiently good. As a method for realizing this, there has been proposed a sanitary ware characterized by scattered CaO component segregated portions in which CaO components are segregated in a base material. According to this method,
While maintaining the mechanical strength required for sanitary ware, it is possible to accurately design the product shape and dimensions after firing, it is difficult to reduce the yield due to shrinkage and deformation, and more efficient kiln packing than before It is possible to provide sanitary ware with good productivity. However, as a point that is still not enough, when looking at the yield of products, the cause of the decrease in yield is not only based on shrinkage and deformation during firing, but also due to factors up to drying . Among them, cutting during drying is a cause of a fatal decrease in yield, and shrinkage of the substrate during drying is a factor.

[0004]

According to the present invention, there is provided a sanitary ware having a porcelain body and a glaze layer formed on a required portion of the base, in order to solve the above problems. And a crystal phase mainly composed of quartz and SiO
₂ , a base containing a glass phase containing Al ₂ O ₃ as a main component, and a crystal phase composed of a mineral selected from cristobalite, andalusite, sillimanite, kyanite, and corundum, if necessary. The component is SiO ₂ :
_{50~65wt%, Al 2 O 3:} 30~45wt%, alkali oxides 0.1~2wt%, 2-valent metal oxide 0.1
10 wt%, at least a CaO component is contained as the divalent metal oxide component, and the CaO is contained in the matrix.
The CaO component segregated part where the component is segregated is scattered,
Provided is a sanitary ware characterized by using fibrous wollastonite having an aspect ratio of 10 or more as a base material. By using fibrous wollastonite having an aspect ratio of 10 or more as a base material, the required mechanical strength is maintained by the action of forming the CaO component segregated portion where the CaO component is segregated, and the firing shrinkage is sufficient. To provide a sanitary ware that can be accurately designed in the shape and dimensions of the product after firing, hardly causes a decrease in yield due to shrinkage or deformation, and is more efficiently packed in a kiln and has higher productivity than before. The effect that becomes possible and the drying shrinkage rate of the substrate become small, the occurrence of drying breaks is suppressed, and the yield until drying of the product is improved, and the occurrence of drying breaks is suppressed, so that drying is suppressed. The effect of improving productivity such as shortening the time required can be obtained. The reason why the drying shrinkage ratio of the green body becomes small is considered as follows. This is because, when the fibrous crystals having a large aspect ratio are dispersed in the matrix, the movement of the raw material particles is prevented when the moisture between the raw material particles is reduced by drying. Therefore, this effect cannot be obtained with wollastonite having a small aspect ratio. In order to obtain a sufficient effect, the aspect ratio needs to be 10 or more.

[0005] In a preferred aspect of the present invention, the crystal phase is dispersed in the glass phase, and the composition ratio of the glass phase to the base is less than 60 wt%. By controlling the ratio of the glass phase to less than 60 wt%, large shrinkage due to liquid phase sintering can be suppressed, and the firing shrinkage can be suppressed to 6% or less.

In a preferred embodiment of the present invention, the above C
The relationship between the abundance ratio (weight ratio) of Ca and Na, K, and Mg in the aO component segregation section is Ca> Na, Ca> K, Ca> M.
Make sure that all of g are satisfied. By doing so, the component of the CaO component segregation part is greatly different from the glass phase component, so that the effect of the CaO component segregation part being scattered is emphasized.

[0007] In a preferred aspect of the present invention, the amount of the CaO component in the substrate is 1 wt% or more. By setting the amount of the CaO component to 1 wt% or more, an excellent relationship between bulk specific gravity and strength can be obtained. CaO
It is considered that when the amount of the component is large, the shrinkage of the glass phase accompanying the liquid phase sintering can be suppressed to a small value.

[0008] In a preferred aspect of the present invention, the relationship between the CaO component and the other divalent metal oxide component in the base material is such that the content of the other divalent metal oxide is 50 parts by weight or less based on 100 parts by weight of CaO. To be there. By doing so, an excellent relationship between bulk specific gravity and strength is obtained. It is considered that when the CaO component is large, the shrinkage accompanying the liquid phase sintering in the glass phase can be suppressed to be small.

[0009] In a preferred aspect of the present invention, the amount of quartz in the substrate is 20 wt% or less. By doing so, it is possible to suppress an excessive increase in the coefficient of thermal expansion of the base material, and in a product having a large and complicated structure such as sanitary ware, cracks are less likely to occur during the cooling process during firing. .

In a preferred embodiment of the present invention, when the base contains corundum, the amount of corundum is 20 wt.
%. Since corundum has a high Young's modulus, it is possible to obtain a great strength-improving effect by uniformly dispersing it in a substrate. When the base contains corundum, the amount of corundum is preferably set to 20 wt% or less. This is because if corundum has a higher specific gravity than other minerals and a glass phase and contains more than 20 wt%, the specific gravity of the base material becomes large and a burden is imposed upon construction and the like.

In the present invention, a step of forming a raw material, a step of glazing a necessary portion as necessary,
A sanitary ware which can be produced by a method including a step of firing at a temperature of 1300 ° C. to 1300 ° C., wherein the base material contains a clay mineral, quartz, an alkali metal-containing material, a divalent metal-containing material, The mineral is a mineral containing at least one selected from kaolinite, dickite, halloysite, sericite, and pyrophyllite. As the divalent metal-containing raw material, at least the fibrous wollastonite having an aspect ratio of 10 or more is contained. The amount of the quartz is 30 wt% or less based on the raw material, and the amount of the clay mineral is 30 to 90 wt% based on the raw material.
The sanitary ware is characterized in that the base material is adjusted in particle size so that the average particle size based on a laser diffraction particle size analyzer is 3 to 10 μm. CaO
By using fibrous wollastonite having an aspect ratio of 10 or more as a raw material used to introduce
The effect of forming the portion where the CaO component is segregated and the effect of suppressing the drying shrinkage of the substrate can be obtained. Therefore, while maintaining the required mechanical strength, the firing shrinkage becomes sufficiently small, and the product shape and dimensions after firing can be accurately designed.
By reducing the yield based on shrinkage and deformation, it is possible to provide sanitary ware with good productivity and good productivity, and the drying shrinkage rate of the base material becomes smaller, and The effect of improving productivity is obtained such that the occurrence of drying out is suppressed and the yield to drying of the product is improved, and the occurrence of drying out is suppressed, so that the time required for drying can be shortened.

In the present invention, a step of forming a base material, a step of glazing a necessary portion as necessary, 1100
A sanitary ware which can be produced by a method including a step of firing at a temperature of １1300 ° C., wherein the base material is a clay mineral, quartz, a raw material containing an alkali metal oxide, a raw material containing a divalent metal oxide, an ignition Contains small weight loss raw materials, the clay minerals are kaolinite, dickite, halloysite,
Sericite, a mineral containing at least one selected from pyrophyllite, the bivalent metal-containing raw material contains at least an aspect ratio of fibrous wollastonite of 10 or more, the amount of the quartz is 30 wt% or less based on the raw material, the clay mineral is 30-90 wt% based on the raw material, the raw material having a small ignition loss is 5-50 wt% based on the raw material, and the raw material is A sanitary ware characterized in that the particle size is adjusted so that the average particle size based on a laser diffraction particle size analyzer is 3 to 10 μm. By containing a raw material having a small ignition loss, firing shrinkage based on the ignition loss is reduced.

In a preferred embodiment of the present invention, the raw material having a small loss on ignition is chamotte, and the main mineral of the chamotte is at least one mineral selected from mullite, cristobalite, quartz and corundum,
The amount of CaO in the chamotte is set to 1% by weight or more. By using a crystalline chamotte having an amount of CaO of 1 wt% or more, the mechanical strength is improved by the crack deflection effect, and the firing shrinkage can be reduced by reducing the ratio of the glass phase.

In a preferred embodiment of the present invention, the raw material having a small loss on ignition is a hollow glass mainly composed of Si ₂ O and Al ₂ O ₃ . By doing so, the pores of the hollow glass remain as closed pores in the substrate, so that a substrate having a low bulk specific gravity is obtained for the strength.

In a preferred embodiment of the present invention, the raw material having a small ignition loss is at least one selected from shirasu balloon, expanded perlite, and expanded shale. By doing so, since the pores remain as closed pores in the substrate, a substrate having a low bulk specific gravity is obtained for the strength.

In a preferred aspect of the present invention, in the step of adjusting the particle size of the raw material, the raw material excluding wollastonite is adjusted such that the average particle diameter becomes 3 to 10 μm, and then mixed with wollastonite. I do. When pulverization is required for adjusting the particle size, wollastonite is pulverized to reduce the aspect ratio, and the effect of suppressing the drying shrinkage may be reduced. By the above method, wollastonite is prevented from being pulverized, and the original effect can be obtained.

In a preferred aspect of the present invention, the bulk density (Db) of the green body is 1.6 to 2.1 g / cm ³ , and the relationship between the bulk density of the green body and the bending strength (Sb) is Sb>
60 × Db−60 (MPa). By doing so, the balance between weight reduction and mechanical strength is maintained at a practical level as sanitary ware.

In a preferred aspect of the present invention, there is provided a sanitary ware characterized in that a firing shrinkage in a longitudinal direction of the base material in the firing step is 6% or less.
By doing so, the balance between weight reduction, mechanical strength, and design freedom is maintained at a practical level as sanitary ware.

In a preferred aspect of the present invention, the glaze layer has a coefficient of thermal expansion of 0 to 30 × 10 ⁻⁷ more than that of the base material.
/ ° C Make the glaze smaller. By forming a glaze layer having a coefficient of thermal expansion of 0 to 30 × 10 ⁻⁷ / ° C. smaller than that of the base material on the base surface, fine cracks due to aging of the glaze surface are less likely to occur.

In a preferred embodiment of the present invention, the element
The coefficient of thermal expansion of the ground is 50-90 × 10 ^-7(/ ° C) (50 ~
600 ° C.). 90 × 10^-7Less than
Products with large and complex structures such as sanitary ware
Cracks are less likely to occur during the cooling process during firing
Become. Also, 50 × 10^-7By doing above, crack
Confirm the degree of freedom of design of the glaze layer under conditions where defects such as
Can be maintained.

In a preferred embodiment of the present invention, the molding method is a slip casting method. By doing so, large and complex sanitary ware can be easily manufactured at low cost.

[0022]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS First, main terms in the present invention will be described. In the crystalline phase present invention, a particular mineral and crystalline phase refers to a portion having a regular diffraction pattern in X-ray diffraction.
The amount of the crystal phase was quantified by an internal standard method from a calibration curve using a standard substance of each crystal phase, and expressed as a weight ratio.

[0023] In the glass phase present invention, a glass phase, refers to a portion other than the above-mentioned crystalline portion exhibiting no regular diffraction pattern Keep X-ray diffraction.

In the present invention, the ratio of the glass phase in the base is defined by the weight ratio of the glass phase to the whole base. In particular,
It is the amount excluding the amount of the crystal phase determined by X-ray diffraction.

Components of the base material Ceramic components include oxides and solid solutions of a plurality of metal species such as complex oxide crystals and glass phases represented by mullite, and these are also determined by fluorescent X-ray analysis. It is defined in terms of weight ratio in terms of a quantified single component metal oxide.

As a result of elemental analysis by the CaO component segregation part EPMA,
A region having a high concentration is defined as a CaO component segregated portion. Ca
In the O component segregation part, based on the elemental analysis by EPMA,
It is more preferable that the Mg concentration, the Na concentration, and the K concentration are not significantly changed or are lower than those in the periphery in order to reduce firing shrinkage.

Dispersion of CaO component segregation part “ Dispersion ” refers to a state where regions are present not only in one place but in many places. In such a state, a crack deflection effect is effectively exerted.

Dry shrinkage rate of the substrate A mark of 150 mm length was placed in a mold for forming a test piece having a width of 30 mm, a thickness of 15 mm, and a length of 260 mm, and the test piece was formed and dried. The length was measured, and the percentage of the change in the length divided by 150 mm was defined as the dry shrinkage of the substrate.

The bulk density of the green body is measured by the Archimedes method. Width 2
After drying a test piece (baked body) having a thickness of 5 mm, a thickness of 5 mm and a length of 20 mm at 105 ° C. for 24 hours, the test piece is cooled to room temperature in an environment where the test piece does not absorb moisture, and the mass W1 is measured. Next, the test piece is kept in a vacuum for one hour to release bubbles. Further, under the same environment, the test piece is kept in water for 1 hour and then returned to room temperature. Next, the test piece is weighed while freely hanging in water with a thin thread, and the mass W2 is measured. Thereafter, this is taken out of the water, the water droplets on the surface are quickly wiped off with a squeezed compress, and the mass W3 is measured immediately. Bulk density is water density, W1, W2, W
It is obtained from the following equation from 3. Bulk density = water density × W1 / (W3-W2)

The flexural strength of the green body is measured by a three-point bending method using a fired φ13 × 130 mm test piece at a span of 100 mm and a crosshead speed of 2.5 mm / min.

Firing shrinkage rate of the base material A mark of 150 mm length was placed on an unfired test piece having a width of 30 mm, a thickness of 15 mm, and a length of 260 mm, and a percentage obtained by dividing a change in the length after firing by 150 mm was calculated. The firing shrinkage was used.

The amount of softening deformation of the green body The unfired test piece having a width of 30 mm, a thickness of 15 mm, and a length of 260 mm is fired while being supported by a span of 200 mm, and the deflection of the center of the fired test piece and the thickness of the test piece are determined. Measure. Since the amount of deflection at this time is inversely proportional to the square of the thickness of the test piece, the amount of deflection converted when the thickness is 10 mm was defined as the amount of softening deformation of the substrate by the following equation. Softening deformation of the matrix = deflection amount measurement value × (thickness of test piece after baking) ^{2/10 2}

The coefficient of thermal expansion of the green body was measured using a calcined diameter of 5 m.
Using a test piece having a length of 20 mm and a length of 20 mm, the coefficient of linear thermal expansion was measured by a differential dilatometer using a compression load method or a measurement temperature range of 50 to 600 ° C.

Impact strength of the substrate The impact strength of the substrate was measured with a Charpy tester using a fired φ13 × 130 mm test piece.

The thermal shock resistance of the substrate is 25 mm in width × 10 mm in thickness × 110 in length.
After holding the test piece of 1 mm at a predetermined temperature for 1 hour or more, the test piece was put into water and rapidly cooled, and the presence or absence of cracks was checked and evaluated. It showed the maximum temperature difference where no cracks occurred.

Next, an example of a method for producing the sanitary ware of the present invention will be described. As a raw material starting material, a clay mineral, wollastonite having an aspect ratio of 10 or more is an essential component, and in addition, a quartz, an alkali metal-containing material, and a material having a small ignition loss may be added. The above-mentioned raw materials are mixed and, if necessary, ground with a ball mill or the like to obtain a raw material. The average particle size of the raw material based on a laser diffraction particle size analyzer is 3 to 10 μm
It is preferred to adjust to. When pulverization is necessary, it is preferable to mix wollastonite after pulverizing and adjusting the particle size without wollastonite. When the casting method is used in the subsequent forming step, the raw material is dispersed in water and used as a suspension. In the suspension, a dispersant, a preservative, a sizing agent, an antibacterial agent and the like may be added. Kaolinite, dickite, halloysite, sericite, and pyrophyllite can be suitably used as the clay mineral. As the alkali metal-containing raw material, sericite, feldspar, and nepheline can be suitably used. As the divalent metal-containing raw material, dolomite, limestone, general wollastonite and anorthite can be suitably used. As for the composition of each raw material, the clay mineral is preferably used in an amount of 30 to 90 parts by weight, and the fibrous wollastonite having an aspect ratio of 10 or more is preferably used in an amount of 1 to 15 parts by weight. The alkali-containing raw material has a total amount of alkali oxides of 2
It can be used in a range not exceeding wt%. Also,
When using a quartz raw material, the content should be 30 parts by weight or less,
When a raw material having a small ignition loss is used, it is preferable to use the raw material within a range of 5 to 50 parts by weight.

Fabrication method The raw material is molded by a casting method or the like, and after demolding and drying, glaze is applied to necessary portions and fired. A plaster mold, a resin mold, or the like can be used for the casting mold, and any of pressure application, vacuum suction, mold suction, and head pressure can be used as the pressure application method. Drying can be performed, for example, at room temperature to about 110 ° C. Glaze,
Methods such as wet spray, dry spray, (other examples) and the like can be used. As the glaze, natural raw materials such as feldspar, quartz, limestone and the like, amorphous raw materials such as frit glaze and the like added with a pigment and an emulsifier can be used. As the glaze, it is preferable to use a raw material whose coefficient of thermal expansion is smaller by 0 to 30 × 10 ⁻⁷ / ° C. than that of the base material. The firing can be performed at a temperature of 1100 to 1300 ° C. For firing, either a continuous firing furnace or a batch furnace can be used.

[0038]

Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 2 shows the raw materials used in the examples, their chemical compositions, and the amounts of main minerals. FIGS. 3 and 4 show the raw materials used, the amounts of minerals contained in the raw materials, the compositions and properties of the green bodies according to the comparative example and the present invention, and the like.

The total amount of alkali oxides in the base composition is the total amount of alkali oxides such as Na ₂ O and K ₂ O in the base chemical composition, and the total amount of alkaline earth oxides is the total amount of alkaline earth oxides such as MgO and CaO. Shows the total amount of similar oxides. Among the minerals contained, the amount of cristobalite was undetermined, and the presence of cristobalite was indicated by a triangle.

FIGS. 3 and 4 show a comparison between the prior art and the technology of the present invention. Reference numerals 1 and 2 denote bases made of a conventional technique, and base Nos. Nos. 3 to 7 are base materials of the present invention.
No. The substrate No. 1 is a substrate in which firing shrinkage is reduced by using a raw material having a small ignition loss and reducing a sintering flux component such as alkali in the raw material. The base of No.2 is
Using wollastonite and limestone as raw materials,
This is a base material whose strength is improved by dispersing the aO component segregated portions. The wollastonite used at this time was of a short fiber type and had an aspect ratio of about 8. Its average particle size is about 20 μm. Wollastonite and limestone were crushed together with other raw materials to adjust the particle size so that the average particle size became 6 μm. No. The base of No. 2 is No. 2 High strength is obtained for the base material for the bulk density. The drying shrinkage rate was 2.5 for all substrates.
%. On the other hand, the base No. Nos. 3 to 7 are base materials using wollastonite having an aspect ratio of 10 or more. Wollastonite was mixed after pulverizing other base materials and adjusting the particle size to a predetermined particle size. FIG. 5 shows the fiber length, fiber diameter, and aspect ratio of each wollastonite. No. Wollastonite used in the base material of No. 3 has an aspect ratio of 20, an average fiber length of 300 μm, and an average fiber diameter of 15 μm. No.
The wollastonite used in the base of No. 4 has an aspect ratio of 2
0, the average fiber length is 30 μm, and the average fiber diameter is 1.5 μm. No. Wollastonite used in the base material of No. 5 has an aspect ratio of 25, an average fiber length of 200 μm, and an average fiber length of 6 μm. The drying shrinkage rate was 2% or less in any of the substrates. Thus, drying shrinkage was able to be reduced by using wollastonite having an aspect ratio of 10 or more. In addition, the effect of wollastonite to scatter the CaO component segregated portions in the base material could simultaneously improve the strength.

FIG. 1 shows No. 1 of the present invention. FIG. 3 is a schematic view of a wash basin A prototyped with a base material of No. 3; For comparison, No. 1 of the prior art was used. Prototypes were also made with a base of 1. FIG. 2 shows the chemical composition of the glaze used in the trial production. This glaze is a bristol glaze which is generally used for sanitary ware and has a thermal expansion coefficient of 51 × 10 ⁻⁷ / ° C. The trial production was performed by molding by a slip casting method using a gypsum mold, followed by finishing, drying, and glazing, followed by firing. Regarding the drying, the presence or absence of drying out was evaluated by drying under two kinds of drying conditions.
FIG. 6 shows the drying conditions and the results of evaluation of drying out. In the drying condition 1, after finishing the molded product removed from the plaster mold,
It was dried at room temperature for one day and then dried in a drying room at 50 ° C. for one day. In the drying condition 2, the finished molded product removed from the gypsum mold was immediately put into a drying room at 50 ° C. and dried for one day. No. In the substrate No. 1, no drying break occurred under the drying condition 1, but the drying break occurred under the drying condition 2.
On the other hand, no. With the substrate of No. 3, no drying out occurred under any of the drying conditions. Those which did not cause drying out in the drying stage were fired. After firing, no particular problem occurred with any of the prototypes. As described above, since the drying shrinkage rate is reduced, cutting during drying is less likely to occur. Also, the time for the drying step can be reduced. In particular, since the time required for drying becomes longer as the product becomes larger, it is important to shorten the time of the drying step to increase the efficiency of production.

[0042]

According to the present invention, the product shape and dimensions after firing can be accurately designed while maintaining the mechanical strength required for sanitary ware, and a reduction in yield due to shrinkage or deformation is unlikely to occur. In addition, it is possible to provide a sanitary ware which has a high efficiency of filling in a kiln and has high productivity, and further suppresses the occurrence of drying-out and shortens a drying time.

[Brief description of the drawings]

FIG. 1 is a schematic diagram of a wash basin experimentally manufactured in an embodiment.

FIG. 2 shows the chemical composition and the amount of minerals contained in raw materials used in Examples.

FIG. 3 shows the raw materials used, the amount of minerals contained in the raw materials, the composition of the green body, and the characteristic values of the green bodies according to the comparative example and the present invention.

FIG. 4 shows raw materials used for the substrate according to the present invention, the amount of minerals contained in the raw material, the composition of the substrate, and characteristic values.

FIG. The fiber length, fiber diameter, and aspect ratio of each wollastonite mixed in the base materials 3, 4, and 5.

FIG. 6 shows the chemical composition of the glaze used in the trial production.

FIG. 7 shows drying conditions and evaluation results of drying out.

[Explanation of symbols]

 A: Wash basin

Claims (21)

[Claims] 1. A sanitary ware comprising a ceramic body and a glaze layer formed on a required portion of the body, wherein the body comprises a crystal phase mainly composed of mullite and quartz, SiO ₂ , Al _{The base} material contains a glass phase containing ₂ O ₃ as a main component and, if necessary, a crystal phase made of a mineral selected from cristobalite, andalusite, sillimanite, kyanite, and corundum, and the main component of the base material is SiO. ₂ : 50 to 65 wt%, Al ₂
O ₃ : 30 to 45 wt%, alkali oxide 0.1 to 2 w
0.1% to 10% by weight of a divalent metal oxide, wherein at least a CaO component is contained as the divalent metal oxide component, and the CaO component segregated portion in which the CaO component is segregated in the base material is A sanitary ware, which is scattered and uses fibrous wollastonite having an aspect ratio of 10 or more as the raw material. 2. The sanitary ware according to claim 1, wherein the crystal phase is dispersed in the glass phase, and a composition ratio of the glass phase to the base is less than 60 wt%. 3. Ca and N in the CaO component segregation part.
The relation of the abundance ratio (weight ratio) of a, K, and Mg is Ca> N.
The sanitary ware according to claim 1 or 2, wherein a, Ca> K, and Ca> Mg are all satisfied. 4. The sanitary ware according to claim 1, wherein the amount of the CaO component in the substrate is 1 wt% or more. 5. The relationship between the CaO component and the other divalent metal oxide component in the substrate is such that the other divalent metal oxide is 50 parts by weight or less based on 100 parts by weight of CaO. The sanitary ware according to claim 1. 6. An alkaline oxide component 1 in the substrate.
The sanitary ware according to any one of claims 1 to 5, wherein the divalent metal oxide component is present in an amount of 100% by weight or more based on 00 parts by weight. 7. The sanitary ware according to claim 1, wherein the amount of quartz in the substrate is 20 wt% or less. 8. The sanitary ware according to claim 1, wherein when the base contains corundum, the amount of corundum is 20 wt% or less. 9. A sanitary ware which can be produced by a method including a step of forming a base material, a step of glazing a necessary portion as necessary, and a step of firing at a temperature of 1100 to 1300 ° C. Contains a clay mineral, quartz, a raw material containing an alkali metal and a raw material containing a divalent metal, and the clay mineral contains at least one selected from kaolinite, dickite, halloysite, sericite, and pyrophyllite. Wherein the bivalent metal-containing raw material contains at least an aspect ratio of fibrous wollastonite having an aspect ratio of 10 or more; the amount of the quartz is 30 wt% or less based on the raw material; The amount is 30 to 90 w
The sanitary ware, wherein the base material is adjusted in particle size such that the average particle size based on a laser diffraction particle size analyzer is 3 to 10 μm. 10. A sanitary ware which can be produced by a method including a step of forming a base material, a step of glazing a necessary portion as required, and a step of firing at a temperature of 1100 to 1300 ° C. Contains a clay mineral, quartz, a raw material containing an alkali metal oxide, a raw material containing a divalent metal oxide, and a raw material having a small loss on ignition. The clay mineral is kaolinite, dickite, halloysite, sericite, pyrophyllite. A mineral containing at least one kind selected from light, wherein the divalent metal-containing raw material contains at least an fibrous wollastonite having an aspect ratio of 10 or more, and the amount of the quartz is 30 wt% or less, the clay mineral is 30 to 90 wt% with respect to the raw material, and the raw material having a small loss on ignition is 5 to 5 with respect to the raw material. 0w
The sanitary ware, wherein the base material is adjusted in particle size such that the average particle size based on a laser diffraction particle size analyzer is 3 to 10 μm. 11. The raw material having a small loss on ignition is chamotte, and the main mineral of the chamotte is at least one mineral selected from mullite, cristobalite, quartz and corundum, and the amount of CaO in the chamotte is The sanitary ware according to claim 10, wherein the content is 1 wt% or more. 12. The raw material having a small loss on ignition is Si ₂
O, sanitary ware according to claim 10, characterized in that the Al ₂ O ₃ is a hollow glass whose main component. 13. The sanitary ware according to claim 10, wherein the raw material having a small ignition loss is at least one selected from shirasu balloons, expanded perlite, and expanded shale. 14. In the step of adjusting the particle size of the base material, the base material excluding wollastonite has an average particle size of 3 to 3.
The sanitary ware according to any one of claims 9 to 13, wherein wollastonite is mixed after the particle size is adjusted to 10 µm. 15. The bulk density (Db) of the green body is 1.6.
２．１2.1 g / cm ³ , and the relationship between the bulk density of the substrate and the bending strength (Sb) is Sb> 60 × Db-60 (MPa).
The sanitary ware according to claim 1, wherein: 16. A firing shrinkage in the longitudinal direction of the base material is 6%.
The sanitary ware according to claim 1, wherein: 17. The sanitary ware according to claim 1, wherein the glaze layer is a glaze having a coefficient of thermal expansion smaller by 0 to 30 × 10 ⁻⁷ / ° C. than the base material. 18. The thermal expansion coefficient of the substrate is 50 to 90 ×
The sanitary ware according to claim 1, wherein the temperature is 10 ⁻⁷ (/ ° C.) (50 to 600 ° C.). 19. The impact strength of the substrate is 2 × 10 ⁻¹ J /
The sanitary ware according to claim 1, wherein the sanitary ware is at least ² cm ² . 20. The molding method according to claim 9, wherein the molding method in the molding step is a slip casting method.
10. The sanitary ware according to 9. 21. The sanitary ware, a hand-washing machine, a wash basin,
The sanitary ware according to any one of claims 1 to 20, wherein the sanitary ware is any of a urinal, a toilet bowl, a toilet tank, a toilet bowl, a sink, a baby bath, and a shower pan.